CN101290432A - Multilens member, illumination apparatus, and liquid crystal display apparatus - Google Patents

Multilens member, illumination apparatus, and liquid crystal display apparatus Download PDF

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Publication number
CN101290432A
CN101290432A CNA2008100914765A CN200810091476A CN101290432A CN 101290432 A CN101290432 A CN 101290432A CN A2008100914765 A CNA2008100914765 A CN A2008100914765A CN 200810091476 A CN200810091476 A CN 200810091476A CN 101290432 A CN101290432 A CN 101290432A
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China
Prior art keywords
tectosome
prism
lens
multilens
base material
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CNA2008100914765A
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Chinese (zh)
Inventor
岛崎胜辅
小川容一
佐藤畅高
小山荣二
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Maxell Holdings Ltd
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Hitachi Maxell Ltd
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Publication of CN101290432A publication Critical patent/CN101290432A/en
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Abstract

The target of this invention is to provide an optical component capable of improving the optical property of an illumination device and realizing the thinning and low cost of a liquid crystal device. A lens combination is used for solving the target and is provided with a base material with light transmission, a plurality of first lenses formed on the base material, a plurality of second lenses that is formed on the plurality of first lenses and connected with the plurality of first lenses in a first side facing to the base material; the first side of the second lens includes a junction that is connected with the first lens and projected outwardly from the junction portion.

Description

Multilens member, lighting device and liquid crystal indicator
Technical field
The present invention relates to control incident light directive property and have the multilens member of cantilever shape and used its lighting device and liquid crystal indicator.
Background technology
In the past, in the various lighting devices of backlight unit of LCD etc., had the mechanism of adjustment from the expansion and the brightness of the light of light source.In the majority of illumination device, in its light path or the exit wound of bullet of light source shell, be provided with the optics of the thin slice etc. of the directive property that is used to control light.This optics has light transmission, and it is consistent or make the function of incident light diffusion to have the direction of the working direction that makes incident light and regulation.
Make the working direction of incident light consistent as being used to, promptly control the representational example of optics of the directive property of incident light, prismatic lens is arranged (for example, with reference to patent documentation 1: the flat 10-506500 communique of Japanese Unexamined Patent Application Publication) with prescribed direction.Prismatic lens generally be with extend along prescribed direction and with the cross section of this bearing of trend quadrature be the prism-like of triangle optical structure (below, also be called the prism-like tectosome), perhaps along prescribed direction extend and with the cross section of this bearing of trend quadrature be a plurality of parts that are arranged in the structure on the flat substrates continuously of lenticulated optical structure (below, also be called the phacoidal structure body) of semicircle (semiellipse) shape.In prismatic lens, the working direction (directive property) that prismatic effect by being formed at these the little optical structures on the base material or lens effect are controlled light.
In addition, in the backlight unit that liquid crystal indicator is used, for example use 2 prismatic lenses that a plurality of above-mentioned prism-like tectosomes are set in the past on base material, and be configured to the bearing of trend mutually orthogonal (for example, with reference to patent documentation 1) of the prism-like tectosome of each prismatic lens.The general structural table of the backlight unit that this liquid crystal indicator is used is shown among Figure 19.And the ordinary construction of prismatic lens is illustrated among Figure 20.The backlight unit 201 that liquid crystal indicator is used as shown in figure 19, mainly comprise light source 203, will from the thick stick 210 of light source 203 emission change into area source light guide plate 204, be configured in the bottom (side opposite) of light guide plate 204 with LCD panel 202 reflector plate 205, be configured in a plurality of functional optical sheet groups 206～208 on the top (LCD panel 202 1 sides) of light guide plate 204.Functional optical sheet group mainly comprises bottom diffusion sheet 206, prismatic lens group 207 and top diffusion sheet 208 etc.In addition, in Figure 19, separately put down in writing each optics, but in fact each optics contact is overlapping for the structure of understanding liquid crystal indicator 200 easily.
Prismatic lens group 207 is made of 2 prismatic lens 207a and 207b, and each prismatic lens has the structure that a plurality of cross sections that are arranged in parallel are triangle and the prism-like tectosome 207d that extends along prescribed direction as shown in figure 20 on flat substrates 207c.And, in backlight 201, be configured to the bearing of trend mutually orthogonal of the prism-like tectosome 207d of each prismatic lens 207a, 207b.In the backlight unit 201 that liquid crystal indicator is used, as shown in figure 19, use 2 prismatic lenses and be configured to each prismatic lens 207a, 207b prism-like tectosome 207d the diffraction direction mutually orthogonal the reasons are as follows described.
In the backlight unit 201 of as shown in figure 19 sidelight mode, because at the sidepiece configuration light source 203 of light guide plate 204, so the directive property of the light 211 that penetrates from the light emergence face 204a of light guide plate 204 is inhomogeneous in the face of light emergence face 204a.Thereby, in the liquid crystal indicator 200 of as shown in figure 19 Exposure Metering, need alignment to pass through the directive property of this light guide plate 204 and to the back side of LCD panel 202 irradiates light 212 equably.Functional form optical sheet set 206～208 has the effect of directive property that the light 211 of light guide plate 204 has been passed through in adjustment (alignment).Wherein, each prismatic lens 207a, 207b utilize prism-like tectosome 207, play the light 211 that makes by light guide plate 204 incidents and reflect and assemble the effect that improves brightness.Yet, under the situation of only using 1 prismatic lens as shown in figure 20, the directive property of having passed through the light 211 of light guide plate 204 can only be adjusted into a direction (with the direction of the bearing of trend quadrature of prism-like tectosome), can not adjust other directions for example with the directive property of the direction of this direction quadrature.This occasion, the abundant directive property of alignment light 211, thus can not obtain enough brightness.So, in existing backlight unit 201 as shown in figure 19, for the abundant directive property of alignment light 211 so that the mode of the bearing of trend mutually orthogonal of prism-like tectosome 207d disposes 2 prismatic lens 207a and 207b, increase light 211 directive property controlling party to.
In the optics of above-mentioned prismatic lens etc., the method as the optical structure that forms prism-like, lenticular etc. on flat substrates made with the following method in the past.Be produced on the surface and have the mould of the recess of corresponding with the shape of the optical structure of prism-like, lensing etc. (shape of upset optical structure), thereby use is transferred to thermal transfer mode on the base material to this mold heated and by being pressed on the base material recess with die surface, after perhaps between this mould and base material, having filled ultraviolet hardening resin, make this hardening of resin form dry film method of optical structure etc. by irradiation ultraviolet radiation.
In addition, in the past, as the optical sheet of the directive property of light control usefulness, the optical sheet that has proposed to form on the two sides of flat substrates optical structure was (for example, with reference to patent documentation 2: No. 3455884 communique of Japan's special permission).
As mentioned above, at existing liquid crystal indicator or in the set lighting device that is called as the backlight unit in the back side of the display element of liquid crystal board etc., have 2 structures that a plurality of optical sheets are stacked such as prismatic lens of use.If the sheet number increases, then transmission scattering of light, absorption increase and optical property decline like this.And, because the sheet number increases problems such as the thickness increase of generation lighting device and liquid crystal indicator, cost raising.
Summary of the invention
The present invention makes for addressing the above problem, and a kind of optical property that improves lighting device and liquid crystal indicator is provided and realizes the slimming (miniaturization) of lighting device and liquid crystal indicator and the optics of cost degradation and have its lighting device and liquid crystal indicator.
According to first scheme of the present invention, a kind of multilens member is provided, it has: have light transmission base material, be formed at a plurality of first lens on the above-mentioned base material and be formed on above-mentioned a plurality of first lens and a plurality of second lens that in first relative, engage with above-mentioned a plurality of first lens with above-mentioned base material, first mask of second lens have with the junction surface of first lens and from above-mentioned junction surface outstanding laterally teat.
With regard to multilens member of the present invention, be the optics that incident light is provided the optical function of prismatic action, lensing etc., first lens combination that constitutes by a plurality of first lens that are formed on the base material and engage by second lens combination that a plurality of second lens constitute.That is be that the optical structure that will be made of first lens combination and second lens combination is located at the optics on the base material.And, said in this manual " first lens and second lens engage ", not only comprise first lens and second lens by the situation that heat bonding etc. directly engages, also comprise the situation of using bonding agent etc. (passing through adhesive linkage) that first lens and second lens are engaged indirectly.In addition, the face relative with above-mentioned base material of first lens is curved surface, in the occasion that base material contacts with the first lens point, first lens along becoming the face relative of first lens with above-mentioned base material with the face of the tangential direction of the part of base material contact.
In multilens member of the present invention, for example, first lens and second lens are all used above-mentioned prism-like tectosome (along prescribed direction extend and with the cross section of bearing of trend quadrature be the tectosome of triangle) form, and, just can obtain and the existing prismatic lens group identical functions that constitutes by 2 prismatic lenses with an optics so that the mode of the bearing of trend mutually orthogonal of the prism-like tectosome of first lens and second lens has engaged under the situation of first lens combination and second lens combination.This occasion in compound lens device of the present invention, is compared with existing prismatic lens group, can will reduce the thickness of 1 part of base material of prismatic lens, so can realize the slimming and the cost degradation of optics.And, in compound lens of the present invention, owing to compare, can reduce the thickness of 1 part of base material of prismatic lens with existing prismatic lens group, improve optical property so can reduce transmission scattering of light, absorption.
And, in multilens member of the present invention, using different first lens of incident light function and the occasion of second lens, can make it have a plurality of optical functions by enough opticses.Thereby, can also enlarge the design freedom of optics, the optics that is applicable to various uses can be provided.
In addition, in multilens member of the present invention, the face relative (first face) of second lens with base material have with the junction surface of first lens and from above-mentioned junction surface outstanding laterally teat.In other words, the face relative with base material (first face) of second lens is bigger than the junction surface of first lens and second lens.In this occasion, form cantilevered construction in the part of the optical structure that constitutes by first lens and second lens, so can increase from first lens after outside outgoing again to the light of the second lens incident.Therefore, can improve the effect such as prismatic action, lensing of multilens member.
In multilens member of the present invention, the teat of second lens (with the outside wall surface of second lens of the junction surface adjacency of first lens and second lens) is also passable more than 180 degree with the angle that above-mentioned base material constitutes.In this occasion, can increase the area of the teat of second lens of seeing side from second lens (face beyond the face relative) with first lens and base material, can increase from above-mentioned first lens after the outside is penetrated again to the amount of the light of the second lens incident.In addition, the most of light that penetrates from the side of first lens upwards (from the direction of base material) towards second lens advance.If can make this light (upwards penetrating light) that from the light that the side of first lens is penetrated, has composition upwards incide second lens effectively, therefore then upwards penetrate light and be subjected to optical effect (prismatic action, lensing etc.) by second lens again, can improve effects such as prismatic action as multilens member integral body, lensing.At this, be occasion more than 180 degree in the angle that teat and base material constitute, upwards penetrate light and can not advance abreast with teat.Therefore, can reduce to advance abreast etc. and do not incide the amount that upwards penetrates light that second lens are escaped by teat with second lens.In other words, the angle that constitutes at the teat of second lens and base material is the occasion more than 180 degree, can make and upwards penetrate light effectively to teat incident, can improve effects such as lensing as compound lens integral body, lensing.
In multilens member of the present invention, also can have the cavity of dividing by first lens and second lens.
In the optical structure that is made of first lens combination and second lens combination of multilens member of the present invention, the teat of second lens is outstanding laterally from this junction surface.That is, can form cantilevered construction in the part of the optical structure that constitutes by first lens and second lens.Especially, make a plurality of first lens on the occasion of the structure that sets up with second lens between the face, the cavity of being divided by first lens and second lens is formed at multilens member inside.The occasion that the cantilevered construction of cavity or optical structure is arranged in multilens member inside like this, the light that incides multilens member can increase the amount of refraction of incident light repeatedly by the interface of optical structure and air.
In addition, in the optical sheet that above-mentioned patent documentation 2 is put down in writing, also can make incident light repeatedly pass through the interface of (repeatedly refraction) optical structure and air, but, except the incident light composition of the face incident angle with respect to thin slice very little (incident angle approaches parallel with the face of thin slice), most of incident light is reflected 2 times at the incidence point and the ejaculation point of optical sheet.To this, at compound lens of the present invention the occasion of the cantilevered construction of cavity or optical structure is arranged in inside like that, according to the light path of light, can make light at the interface of optical structure and air by refraction more than 3 times.Thereby multilens member of the present invention is compared with the optical sheet that patent documentation 2 is put down in writing, and can increase the amount of refraction of incident light, can improve optically focused.
In multilens member of the present invention, second lens also can have from above-mentioned base material towards the tapered shape of the direction of second lens.In this occasion, it is big that the area of the face relative with base material of second lens becomes, so can increase the amount that incides the light of second lens from first lens towards the light of air again, can increase the optically focused of optical sheet.
In multilens member of the present invention, first of second lens is parallel also passable with above-mentioned base material.In this occasion, the angle that the teat of second lens and base material constitute becomes 180 degree.In this occasion, do not exist and penetrate from the side of first lens and upwards penetrate light, the danger of advancing and not inciding teat and escape abreast with teat towards second lens, one side.Therefore, can make and upwards penetrate light and incide second lens effectively from teat.And, because the shape of second lens and uncomplicated, so can make multilens member easily, and can strengthen the area of the raised face of second lens of seeing from the side of first lens, can increase the optically focused of optical sheet.
In multilens member of the present invention, first lens can comprise a plurality of first thread-like member of extending to first direction, and first thread-like member also can to arranging with the direction of first direction quadrature.
In multilens member of the present invention, second lens can comprise a plurality of second thread-like member of extending to second direction, and second thread-like member also can to arranging with the direction of second direction quadrature.
In multilens member of the present invention, first direction and second direction quadrature also can.
In multilens member of the present invention, first direction and second direction are that identical direction is also passable.For example, all using above-mentioned prism-like tectosome to form on first lens and second lens, and the bearing of trend of first lens and second lens is made as the occasion of equidirectional, forms cantilevered construction in the part of the side of the optical structure that constitutes by first lens and second lens.This occasion, especially, oblique incidence can be passed through repeatedly at the optical structure (lens) and the interface of air to the light of first lens, can increase the amount of refraction of oblique incidence light.Thereby, in this occasion, can more be applicable to the optics of the purposes that need make the rapider refraction of incident light (for example, will change the lighting device etc. of the structure that penetrates than wide-angle) with the light of low-angle incident.
In multilens member of the present invention, first lens trapezoidal also passable with being shaped as of the cross section first direction quadrature.This occasion, the composition surface of first lens and second lens increases, thus on first lens, form second lens easily, and can increase the intensity of multilens member.
In multilens member of the present invention, second lens and the cross section second direction quadrature to be shaped as triangle also passable.And in multilens member of the present invention, it is also passable that the second adjacent lens separate setting.
In multilens member of the present invention, first lens also can comprise first tectosome with the junction surface that engages with second lens and from substrate towards the length of the direction of second lens second tectosome shorter than first tectosome.And first tectosome and second tectosome also can be roughly the same shape.Here, the light that advances to second lens in the junction surface by first lens and second lens diminishes according to the spotlight effect of first lens, and therefore the area of the bonding part of first lens and second lens is little relatively good.To this, in multilens member of the present invention, (first tectosome) engages with second lens first lens in its part.Therefore, situation about engaging with first lens and second lens on the possessive construction body that constitutes first lens relatively can reduce the area at the junction surface of first lens and second lens, can improve the optical property of multilens member.
According to alternative plan of the present invention, a kind of lighting device is provided, it has light source and according to the multilens member of first scheme.And,, in lighting device, can also have and be used for the light that will penetrate from above-mentioned light source light guide plate in the present invention to above-mentioned multilens member guiding.
According to third party's case of the present invention, a kind of liquid crystal indicator is provided, it has light source, according to the multilens member and the liquid crystal display cells of first scheme.And, in liquid crystal indicator of the present invention, can also have and be used for the light that will penetrate from above-mentioned light source light guide plate to above-mentioned multilens member guiding.
In lighting device of the present invention and liquid crystal indicator, because optics as the directive property of adjusting light, use the multilens member of the invention described above, so can realize the slimming (miniaturization) and the cost degradation of lighting device and liquid crystal indicator.And, the lighting device that has improved optical property than existing lighting device and liquid crystal indicator can be provided.
The present invention has following effect.
According to multilens member of the present invention, owing to being engaged the optical structure that forms, first lens and second lens are formed on the base material, so can improve optical property.
According to multilens member of the present invention, lighting device and liquid crystal indicator, because first lens and second lens engage, and need not first lens are formed at respectively on the different base materials with second lens, so can realize the slimming and the cost degradation of multilens member, lighting device and liquid crystal indicator.
Description of drawings
Fig. 1 is the backlight unit of embodiment 1 and the summary construction diagram of liquid crystal indicator.
Fig. 2 is the summary construction diagram of the compound lens sheet of embodiment 1, and Fig. 2 (A) is a stereographic map, and Fig. 2 (B) is the side view that the Y direction is seen from Fig. 2 (A), and Fig. 2 (C) is the side view that the directions X from Fig. 2 (A) is seen.
Fig. 3 is the amplification view of the interior cavity portion of the compound lens sheet of embodiment 1.
Fig. 4 is the summary construction diagram of the manufacturing installation of embodiment 1 employed compound lens sheet.
Fig. 5 is the process flow diagram of order of manufacture method of the compound lens sheet of expression embodiment 1.
Fig. 6 is the section S EM image with the compound lens sheet of embodiment 1 making.
Fig. 7 is the top SEM image with the compound lens sheet of embodiment 1 making.
Fig. 8 is the figure that is illustrated in the light characteristic of measuring with the backlight unit of embodiment 1 and comparative example formation.
Fig. 9 is the summary construction diagram of the manufacturing installation of embodiment 2 employed compound lens sheets.
Figure 10 is the process flow diagram of order of manufacture method of the compound lens sheet of expression embodiment 2.
Figure 11 is the process flow diagram of order of manufacture method of the compound lens sheet of expression embodiment 3.
Figure 12 is the summary construction diagram of the compound lens sheet of embodiment 4.
Figure 13 (A) is the amplification view that the optics of the compound lens sheet of embodiment 4 is adjusted layer, Figure 13 (B) is the amplification view along the angled section of XIIIB-XIIIB line that the optics of the compound lens sheet of expression embodiment 1 is adjusted layer, and Figure 13 (C) is the amplification view of variation of the compound lens sheet of embodiment 4.
Figure 14 is the figure of effect that is used to illustrate the compound lens sheet of embodiment 4, Figure 14 (A) is the figure that is illustrated in the side and does not have the refraction situation of the incident light in the optical structure of cantilevered construction, and Figure 14 (B) is the figure that is illustrated in the refraction situation of the incident light in the optical structure that the side has cantilevered construction.
Figure 15 is the summary construction diagram of the compound lens sheet of variation 1.
Figure 16 is the summary construction diagram of the compound lens sheet of variation 2.
Figure 17 is the summary construction diagram of the compound lens sheet of variation 3.
Figure 18 is the summary construction diagram of the compound lens sheet of variation 4, and Figure 18 (A) is a stereographic map, and Figure 18 (B) is the XVIIIB-XVIIIB line cut-open view among Figure 18 (A).
Figure 19 is the summary construction diagram of existing liquid crystal indicator and lighting device.
Figure 20 is the summary construction diagram of existing prismatic lens.
Figure 21 is the summary construction diagram of the compound lens sheet of variation 5.
Figure 22 is the summary construction diagram of the compound lens sheet of variation 6.
Among the figure:
The 1-light source, 2-light guide plate, 3-reflector plate; the 4-diffusion sheet, 5-compound lens sheet, the 5a-first phacoidal structure body (first lens); the 5b-second prism-like tectosome (second lens); 5c-cavity portion, 6-screening glass (diffusion sheet), 7-LCD panel; the 8-packing material; the 50-base material, 51-first optics is adjusted layer, and 52-second optics is adjusted layer
Embodiment
Below, the embodiment of the multilens member that present invention will be described in detail with reference to the accompanying, lighting device and liquid crystal indicator, but the present invention is not limited thereto.
Embodiment 1
In embodiment 1, liquid crystal indicator and employed lighting device and multilens member are described.
[structure of liquid crystal indicator and backlight unit]
The schematic configuration of embodiment 1 employed liquid crystal indicator is illustrated among Fig. 1.And, in Fig. 1, for the ease of understanding the structure of liquid crystal indicator, each optics is separated record, but each optics is overlapping with state of contact in the actual device.This routine liquid crystal indicator 100 is made of LCD panel 7 (liquid crystal display cells) and backlight unit 10 (lighting device) as shown in Figure 1.
LCD panel 7 has been used the employed LCD panel of existing liquid crystal indicator.Specifically, though not shown here, the structure of LCD panel 7 is made nesa coating, color filter, glass substrate and the polarization plates of the nesa coating of polarization plates, glass substrate, formation pixel capacitors, alignment film, liquid crystal layer, alignment film, the formation confronting electrode structure with this sequential cascade.
Light emitting diode) 1, will change into the light guide plate 2 of area source, the reflector plate 3 that is configured in the bottom (side opposite with LCD panel 7) of light guide plate 2, the bottom diffusion sheet 4 that is configured in the top (LCD panel 7 one sides) of light guide plate 2, the compound lens sheet 5 (multilens member) on top that is configured in bottom diffusion sheet 4 and the top diffusion sheet 6 that is configured in the top of compound lens sheet 5 from the light 11 of light source 1 emission as shown in Figure 1, backlight unit 10 mainly comprises light source (LED:.This routine backlight unit 10 is unit of sidelight mode, and light source 1 is located at the sidepiece of light guide plate 2.
Optics beyond the compound lens sheet 10 has used the identical parts of optics with existing backlight unit.Specifically, light guide plate 2 is formed by polycarbonate.Reflector plate 3 has used on the surface of PET film evaporation silver-colored thin slice.Bottom diffusion sheet 4 has used the material that the PET film is carried out the glass sand coating, and its thickness is made as 70 μ m, and mist is 85%.And top diffusion sheet 6 has used the material that the PET film is carried out the glass sand coating, and its thickness is made as 70 μ m, and mist is 30%.
[structure of compound lens sheet]
The schematic configuration of the compound lens sheet 5 that this is routine is illustrated among Fig. 2.Fig. 2 (A) is the stereographic map of this routine compound lens sheet 5, and Fig. 2 (B) is the side view of the compound lens sheet 5 seen of the Y direction from Fig. 2 (A), and Fig. 2 (C) is the side view of the compound lens sheet 5 seen of the directions X from Fig. 2.Shown in Fig. 2 (A)～Fig. 2 (C), this routine compound lens sheet 5 comprise sheet base material 50, be formed at the first optics adjustment layer 51 on the base material 50 and be formed at second optics that first optics adjusts on the layer 51 and adjust layer 52.
As base material 50, used the thin slice of polycarbonate (PC).And, as the base material 50 of compound lens sheet 5 of the present invention, if the material of light transmission then can use any materials.For example, except PC, can use polyethylene terephthalate acryl resins such as (PET) etc.And, as base material 50, not only can use the base material of sheet, but also can use the base material of arbitrary shape.For example, the tabular base material about can used thickness 0.5～100mm also can use the base material of surface for three-dimensional face.In addition, used the occasion of the base material of sheet like that, considered that the easiness of processing and operability etc. two preferably use the thin slice of the thickness of 30～500 μ m in this example.
First optics is adjusted layer 51 shown in Fig. 2 (A)～Fig. 2 (C), constitute by a plurality of first prism-like tectosome 5a (first lens), each first prism-like tectosome 5a along the Y direction (first direction) among Fig. 2 (A) extend and with the cross section of this bearing of trend quadrature be trapezoidal shape.And, adjusting in the layer 51 at first optics, the first prism-like tectosome 5a arranges along the directions X (second direction) among Fig. 2 (A), and is configured to adjacent prism-like tectosome 5a and contacts with each other.
In this embodiment, as described later, with the surface of base material 50 with directly distortion and form the first prism-like tectosome 5a of thermal transfer mode.That is, the first prism-like tectosome 5a is formed with polycarbonate.And, as the formation material of the first prism-like tectosome 5a,, preferably be 1.3～2.0 resin material according to suitable selective refraction rate such as required optical characteristics, purposes if the material of light transmission then can use any materials.For example, can use lens inorganic material such as lens plastic resins such as acryl resin, urethane resin, styrene resin, epoxy resin, silicone resin or glass etc.In addition, in this embodiment, the refractive index of the first prism-like tectosome 5a is 1.59.
In addition, in this embodiment, the cross sectional shape of the first prism-like tectosome 5a made to make drift angle be the portion that climbs to the top of a mountain of isosceles triangles of 50 degree and the shape that complanation is carried out on the base abreast, promptly trapezoidal (general triangular), the width of the top in this trapezoidal shape cross section is made as about 6.74 μ m, following width is made as about 100 μ m, and, highly be made as 100 μ m.And the shape in the cross section of this first prism-like tectosome 5a and size go up identical (evenly) at the bearing of trend (Y direction) of the first prism-like tectosome 5a.That is, the first prism-like tectosome 5a forms with the thread-like member of trapezoidal column.And, adjust in the layer 51 at first optics, the first prism-like tectosome 5a is configured on the base material 50 with the spacing of about 100 μ m.In addition, size and the spacing of the first prism-like tectosome 5a can suitably change according to required optical characteristics, purposes etc.
Second optics is adjusted layer 52 shown in Fig. 2 (A)～Fig. 2 (C), constitute by a plurality of second prism-like tectosome 5b (second lens), each second prism-like tectosome 5b along the directions X (second direction) among Fig. 2 (A) extend and with the cross section of this bearing of trend quadrature be triangle.That is, the second prism-like tectosome 5b and the first prism-like tectosome 5a are configured to the bearing of trend quadrature.And, adjusting in the layer 52 at second optics, the second prism-like tectosome 5b arranges along the Y direction (first direction) among Fig. 2 (A), is provided with the gap between the second adjacent prism-like tectosome 5b, does not contact mutually.
In this embodiment, the second prism-like tectosome 5b is formed with ultraviolet hardening resin.And the refractive index of the second prism-like tectosome 5b is 1.53.In addition, the formation material of the second prism-like tectosome 5b and the first prism-like tectosome 5a are same, if the material of light transmission can use any materials, preferably are 1.3～2.0 resin material according to suitable selective refraction rate such as required optical characteristics, purposes.
In this embodiment, it is that the width on 90 degree, base is about 24 μ m, highly is the isosceles triangle of about 12 μ m that the shape in the cross section of this second prism-like tectosome 5b and size are on the bearing of trend (directions X) of the second prism-like tectosome 5b identical (evenly) that the cross sectional shape of the second prism-like tectosome 5b is made drift angle.That is, the second prism-like tectosome 5b forms with the thread-like member of triangle column.And the gap between the second adjacent prism-like tectosome 5b is about 5 μ m, and the spacing of the second prism-like tectosome 5b is about 29 μ m.
In addition, in this routine compound lens sheet 5, as described later, with top the engaging of the second prism-like tectosome 5b with the first prism-like tectosome 5a.Specifically, shown in Fig. 2 (A)～Fig. 2 (C), be bonded into and set up with the second prism-like tectosome 5b between the last face of the first prism-like tectosome 5a.Like this, by in compound lens sheet 5, being provided with the facial structure that sets up with the second prism-like tectosome 5b on the first prism-like tectosome 5a, in compound lens sheet 5 inside, shown in Fig. 2 (B), form the 5c of cavity portion with the lower face division of the side wall surface of the first prism-like tectosome 5a and the second prism-like tectosome 5b.
Fig. 3 has represented near the enlarged drawing of the 5c of cavity portion in the compound lens sheet 5.As shown in Figure 3, in this routine compound lens sheet 5, by dividing the cavity 5c of portion with the side wall surface 506 and 507 of outside wall surface 508a, the first prism-like tectosome 5a of the second prism-like tectosome 5b of junction surface 504 adjacency of the first prism-like tectosome 5a and the second prism-like tectosome 5b.And, in this routine compound lens sheet 5, as shown in Figure 3, with the surface of contact 505 of the base material 50 of the outside wall surface 508a of the second prism-like tectosome 5b of junction surface 504 adjacency of the first prism-like tectosome 5a and the second prism-like tectosome 5b and the 508b and the first prism-like tectosome 5a (the first prism-like tectosome 5a's the face relative) with base material 50 between the angle that constitutes all become 180 degree.
As mentioned above, in this routine compound lens sheet 5, because so that the mode of the bearing of trend mutually orthogonal of the bearing of trend of the first prism-like tectosome 5a and the second prism-like tectosome 5b, engage the first prism-like tectosome 5a and the second prism-like tectosome 5b, so can obtain and the function identical functions that obtains with the existing prismatic lens group that constitutes by 2 prismatic lenses with a compound lens sheet 5.And, in this routine compound lens sheet 5, with existing prismatic lens group relatively, can reduce the thickness of 1 part of base material of prismatic lens, so can realize the lighting device such as optics, backlight unit of optics adjustment usefulness and the slimming and the cost degradation of liquid crystal indicator.In addition, in this routine compound lens sheet 5, with existing prismatic lens group relatively owing to can reduce the thickness of 1 part of base material of prismatic lens, so thereby can suppress the reduction that transmission scattering of light, absorption suppress optical property.That is, keep identical or its above brightness, field angle, demonstration grade etc. the time, approach and backlight unit and liquid crystal indicator cheaply with existing product by using this routine compound lens sheet 5, can being provided at.
[method for making of compound lens sheet]
Then, with reference to Fig. 2,4 and Fig. 5 the method for making of the compound lens sheet that this is routine is described.In addition, Fig. 5 is the process flow diagram of order of having represented the method for making of compound lens sheet that should example.
At first, prepared the polycarbonate (the step S11 among Fig. 5) of thickness 200 μ m as base material 50.Then, on base material 50, be formed with first optics that constitutes by a plurality of first prism-like tectosome 5a and adjust layer 51 (the step S12 among Fig. 5).Specifically, following first optics that formed is adjusted layer 51.At first, the concaveconvex shape that is formed at the first optics adjustment layer, 51 lip-deep concaveconvex shape of having prepared to have overturn is formed at lip-deep mould.And the male and fomale(M﹠F) of above-mentioned mould forms by cut.Then, this mould of base material 50 usefulness is carried out heating and pressurizing, on the surface of this base material 50 transfer printing the concaveconvex shape of this mould.That is, use thermal transfer mode, the concaveconvex shape of this mould is transferred on the surface of base material 50.At this moment, mold temperature is made as 180 degree, and pressure is made as 10kg/cm 2, and this state kept for 60 seconds.Then, mold cools down to room temperature, has been peeled off this base material 50 from mould.In this embodiment, by like this, on base material 50, be formed with first optics that constitutes by a plurality of first prism-like tectosome 5a and adjust layer 51 (first lens combination).
Then, adjust on the layer 51 at first optics that is made of a plurality of first prism-like tectosome 5a, following second optics that is made of a plurality of second prism-like tectosome 5b that is formed with is adjusted layer 52 (second lens combination) (step S13 among Fig. 5 and S14).
At this, be illustrated as that second optics that formation is made of a plurality of second prism-like tectosome 5b is adjusted layer 52 and the manufacturing installation that uses.Fig. 4 has represented to adjust the schematic configuration of layer 52 manufacturing installation that uses for forming second optics.Adjust layer 52 manufacturing installation that uses 20 for forming second optics in this embodiment, as shown in Figure 4, mainly comprise: the mould 21 (hereinafter referred to as drum die) of cylinder shape, at the surface applied of drum die 21 resin feeder 22 as the ultraviolet hardening resin of the formation material of the second prism-like tectosome 5b, the lip-deep resin of not wanting that is used for being coated in drum die 21 is cut scraping of falling and is got parts 23, be used to control the control roll 24 of the contact condition on the surface that is coated in drum die 21 lip-deep ultraviolet hardening resins and first optics adjustment layer 51, an and ultraviolet lamp 25 that is used to make the ultraviolet hardening resins sclerosis that contacts with first optics adjustment layer 51.And control roll 24 and ultraviolet lamp 25 clip base material 50 and are configured on the position relative with drum die 21 as shown in Figure 4, and ultraviolet lamp 25 is configured in the downstream (front side of the working direction A2 of the base material 50 among Fig. 4) of control roll 24.
On the surface of drum die 21, be formed with the concaveconvex shape of concavo-convex formation that second optics of having overturn is adjusted the surface of layer 52.In this embodiment, because the cross sectional shape of the second prism-like tectosome 5b is a triangle, so on the surface of drum die 21, formed the groove 26 of the corresponding V font of cross sectional shape of a plurality of and the second prism-like tectosome 5b.
In this embodiment, use above-mentioned manufacturing installation 20, following second optics that is made of a plurality of second prism-like tectosome 5b that formed is adjusted layer 52.At first, the base material 50 that the surface is formed with the first optics adjustment layer 51 is installed on the manufacturing installation, and base material 50 is exported to drum die 21 1 sides (direction of the arrow A 2 among Fig. 4).At this moment, as shown in Figure 4, it is relative with drum die 21 that mounting layer first optics is adjusted layer 51, and the bearing of trend of the first prism-like tectosome 5a of the first optics adjustment layer 51 and be formed at bearing of trend (the sense of rotation A1 of the drum die 21 among Fig. 4) quadrature of groove 26 of the lip-deep V font of drum die 21.
Then, utilize resin feeder 22 on the surface of the drum die 21 of 1 direction of the arrow A in Fig. 2 rotation, to apply ultraviolet hardening resin 27.Then, utilization is located at the scraping of downstream (front side of the sense of rotation of drum die 21) of resin feeder 22 and gets parts 23, the resin of not wanting in the ultraviolet hardening resin 27 that has applied is cut, and in the groove 26 on drum die 21 surfaces, filled ultraviolet hardening resin 27 (the step S13 among Fig. 5).Thereby, on the surface of the drum die 21 of scraping the downstream of getting parts 23, become the state in the groove 26 that ultraviolet hardening resin 27 only is filled in drum die 21 surfaces.Then, as shown in Figure 4,, make ultraviolet hardening resin 27 and second optics in the groove 26 that is filled in drum die 21 adjust layers 51 last facial contact in the zone of clamping with drum die 21 and control roll 24.At this moment, the facial contact condition of going up for the ultraviolet hardening resin 27 in the groove 26 that keeps being filled in drum die 21 surfaces well and first optics are adjusted layer 51 utilizes control roll 24 with the pressure of regulation base material 50 to be pushed to drum die 21.
Then, the base material 50 that has passed through the last facial state of contact of the ultraviolet hardening resin 27 between drum die 21 and the control roll 24 and the first prism-like tectosome 5a from 25 pairs of ultraviolet lamps has shone ultraviolet ray.At this moment, ultraviolet spider that feeds on flies resins 27 sclerosis in the groove 26 on drum die 21 surfaces and the second prism-like tectosome 5b are formed on first optics and adjust on the layer 51, and be adhesively fixed on below the second prism-like tectosome 5b the first prism-like tectosome 5a above, the optical structure that is made of the first prism-like tectosome 5s and the second prism-like tectosome 5b is formed at (the step S14 among Fig. 5) on the base material 50.Then, top base material 50 zone by ultraviolet lamp 25 of the following and first prism-like tectosome 5a of the second prism-like tectosome 5b has been adhesively fixed, then the second prism-like tectosome b is with the first prism-like tectosome 5a and base material 50, peels from the surface of drum die 21.In this embodiment, by like this, will be formed on first optics by the second optics adjustment layer 52 that a plurality of second prism-like tectosome 5b constitute and adjust on the layer 51.
In addition, for easily with the second prism-like tectosome 5b from drum die 21 sur-face peelings, the bonding force that need make drum die surface and the second prism-like tectosome 5b than the bonding force of the second prism-like tectosome 5b and the first prism-like tectosome 5a also a little less than.For this reason, preferably in advance somatotype being carried out on the surface of drum die 21 handles.Handle as this somatotype, the lip-deep method that the somatotype material of inorganicss such as fluorine resin or DLC (adamas same sex carbon), TiN is coated in drum die 21 is more suitable.In this embodiment, on the surface of drum die 21, applied the coating material (KP-801M that Shin-Etsu Chemial Co., Ltd makes) of fluorine resin as the somatotype material.
In this embodiment, by aforesaid step, made the compound lens sheet 5 of the structure shown in Fig. 2 (A).In the manufacture method of this routine compound lens sheet, owing to do not need the first prism-like tectosome 5a is formed at respectively on the different base materials with the second prism-like tectosome 5b, so can be easily and with low-cost production's compound lens sheet.
And, in the manufacture method of this routine compound lens sheet,,, be easier manufacture method therefore owing to do not need the working procedure of coating and the clean operation of packing material with the method for making comparison of embodiment 3 described later.
In addition, in this embodiment, although understand the example that only the second optics adjustment layer 52 is used the manufacturing installation with mold drum shown in Figure 4 and form, but of the present invention being not limited thereto also can be used manufacturing installation shown in Figure 4 when being formed at the first optics adjustment layer 51 on the base material 50.
[the SEM image of compound lens sheet]
Observe first optics of the compound lens sheet of making of this example 5 with electron microscope (SEM) and adjusted the structure that layer 51 and second optics is adjusted layer 52.Its result is illustrated among Fig. 6 and Fig. 7.Fig. 6 is the cross-sectional image along the parallel cut-out of bearing of trend of the second prism-like tectosome 5b of compound lens sheet 5, and Fig. 7 is the top image of compound lens sheet 5.
From the cross-sectional image of Fig. 6 as can be known, in this routine compound lens sheet 5, constitute the top of the first prism-like tectosome 5a and the second prism-like tectosome 5b below be engaged fixing, and the structure that utilizes the second prism-like tectosome 5b to set up between the last face of the first prism-like tectosome 5a.And, as shown in Figure 6 as can be known, utilize the 5c of cavity portion that divides below of the side of the first prism-like tectosome 5a and the second prism-like tectosome 5b to be formed at the inside of compound lens sheet 5.
In addition, in the image, the tectosome that extends along the vertical direction on the drawing of Fig. 7 is the second prism-like tectosome 5b on shown in Figure 7, and is facial corresponding with going up of the first prism-like tectosome 5a across the part between the second prism-like tectosome 5b.As can be known from Fig. 7, observe the prism shape of the second prism-like tectosome 5b clearly.And, clearly observe the gap between the second prism-like tectosome 5b, confirm the second prism-like tectosome 5b and show equidistantly formation discretely greatly.
[evaluation of optical characteristics]
Then, use the compound lens sheet made from this example 6, constitute backlight unit (lighting device) 10 as shown in Figure 1, measured its light characteristic.And, in order to compare, also measured the light characteristic of existing backlight unit 201 (comparative examples) shown in Figure 19.Just, in the backlight unit 201 of comparative example, replace backlight unit 10 shown in Figure 1 embodiment 1 compound lens sheet 5 and used 2 existing prismatic lenses (structure shown in Figure 20), optics in addition is identical with embodiment 1.And the shape with the cross section bearing of trend quadrature the prism-like tectosome that is formed on each prismatic lens of comparative example is made width 30 μ m, the height 15 μ m on base, the isosceles triangle of drift angle 90 degree.
Fig. 8 has represented the light characteristic in the backlight unit of embodiment 1 and comparative example.In Fig. 8, transverse axis is represented the mensuration angle of brightness, and the longitudinal axis is represented brightness ratio.And, 0 degree of transverse axis for the direction of liquid crystal display face quadrature, the brightness ratio of the longitudinal axis is that front face brightness with comparative example is as 1 standardized relative brightness.In addition, the solid line characteristic among Fig. 8 is the light characteristic of embodiment 1, and the dotted line characteristic is the light characteristic of comparative example.From the light characteristic of Fig. 8 as can be known, be merely able in the backlight unit of embodiment 1, front face brightness is than being about 1.05 times of comparative example, and field angle also is about 48 degree (comparative example is 42 degree), obtains which all good than comparative example light characteristic.And, be meant the scope of the angle of the peaked brightness more than 1/2 of expression brightness in light characteristic in this said field angle.This be because, in the compound lens sheet 5 of embodiment 1, with existing prismatic lens group relatively, base material can be reduced to 1 from 2, has reduced the loss of light thus.
From The above results as can be known, in the occasion of having used compound lens sheet 5 that should example, compared with prior art, can improve optical characteristics (brightness, field angle, demonstration grade etc.).And, in the backlight unit and liquid crystal indicator that have used compound lens sheet 5 that should example, can reduce the thickness of 1 part of base material, so compared with prior art, obtain improving optical characteristics, but also thin and backlight unit and liquid crystal indicator cheaply.
In this embodiment, illustrated the first optics adjustment layer 51 is formed at base material 50 lip-deep examples by the thermal transfer mode world, but the present invention is not limited thereto.For example, embodiment 3 is such as described later, the concaveconvex shape of the concaveconvex shape by making the first optics adjustment layer 51 that overturn is formed at lip-deep mould and contacts with base material, and fill ultraviolet hardening resin and make its sclerosis between mould and base material, thereby it is also passable to form first optics adjustment layer, 51 (a plurality of first prism-like tectosome 5a).In addition, also can use well-known extrinsion pressing or compression moulding method, in the model of optical structure is formed at inner mould, inject the injection molding method etc. of molten resin and form first optics and adjust layer 51.
In addition, the method as engaging the first prism-like tectosome 5 and the second prism-like tectosome 5b is not limited to said method.For example, embodiment 2 is such as described later, adhesive-applying on facial at least one on the lower face of the second prism-like tectosome 5b of extrusion modling and the first prism-like tectosome 5a, also passable by the integrally formed first prism-like tectosome 5a of bonding agent and the second prism-like tectosome 5b.
Embodiment 2
In embodiment 2, the compound lens sheet of the structure similarly to Example 1 of making (structure shown in Figure 2).Just, in this embodiment, use with embodiment 1 diverse ways and made compound lens sheet 1.And formation is identical with embodiment 1 with the size of base material, the first prism-like tectosome and the second prism-like tectosome of the compound lens sheet of this example making.Below, with reference to the method for making of Fig. 2,9 and 10 these routine compound lens sheets of explanation.In addition, Figure 10 is the process flow diagram of order of the manufacture method of this routine compound lens sheet of expression.
On base material 50, form first optics at first, similarly to Example 1 and adjusted layer 51 (a plurality of first prism-like tectosome 5a) (step S21 among Figure 10 and S22).And the first prism-like tectosome 5a and embodiment similarly form with polycarbonate.
Then, use methods such as extrusion modling, formed the second prism-like tectosome 5b (wire of triangle column (thread) parts) (the step S23 among Figure 10).The second prism-like tectosome 5b forms with the nylon of refractive index 1.53.In addition, the operation S23 of the moulding second prism-like tectosome 5b can carry out before engineering S21 that forms the first optics adjustment layer 51 and S22, also can carry out in the formation of the first optics adjustment layer 51.
Then, second optics that is made of a plurality of second prism-like tectosome 5b that formed as described below is adjusted layer 52 (S24 among Figure 10 and S25) on the first optics adjustment layer 51.
At this, be illustrated as that second optics that formation is made of a plurality of second prism-like tectosome 5b is adjusted layer 52 and this routine manufacturing installation of using.Be illustrated among Fig. 9 for the schematic configuration that forms the manufacturing installation that the second optics adjustment layer 52 uses in this embodiment.As shown in Figure 9, the manufacturing installation 30 of the second optics adjustment layer 52 of this example mainly comprises: the carriage 32 of guide pulley 31, the second prism-like tectosome 5b (thread-like member) that reels, be used for the adhesive applicating device 33 of adhesive-applying below the second prism-like tectosome 5b and the ultraviolet lamp 34 that is used to make adhesive hardens.And adhesive applicating device 33 is configured between carriage 32 and the guide pulley 31 as shown in figure 10, and ultraviolet lamp 34 is configured in and clips on the relative position of base material 50 and guide pulley 31.
In this embodiment, as shown in Figure 9, forming a plurality of gathering sills 35 that are used for the second prism-like tectosome 5b is adjusted to first optics guiding on the layer 51 on the surface of guide pulley 31.Each gathering sill 35 extends and forms along the sense of rotation (arrow A 3 directions among Fig. 9) of guide pulley 31, with the direction of this sense of rotation quadrature on form with predetermined distance.And the interval of gathering sill 35 is wideer a little than the following width of the second prism-like tectosome 5b, and the height of the depth ratio second prism-like tectosome 5b of gathering sill 35 is a little little.Use the following making of above-mentioned manufacturing installation in this embodiment and will be formed on first optics and adjust on the layer 51 by the second optics adjustment layer 52 that a plurality of second prism-like tectosome 5b constitute.
At first, a plurality of second prism-like tectosome 5b with moulding are wound on the carriage 32.Then, as shown in Figure 9, pull out the second prism-like tectosome 5b, and each second prism-like tectosome 5b is inserted into respectively in the gathering sill 35 of corresponding guide pulley 31 from carriage 32.At this moment, the second prism-like tectosome 5b is passed through on the adhesive applicating device 33 that is disposed between carriage 32 and the guide pulley 31, thereby below the second prism-like tectosome 5b, applied bonding agent (the step S24 among Figure 10).In this embodiment, used ultraviolet hardening resin as bonding agent.In addition, the present invention is not limited thereto, as bonding agent, except UV cured type, can also use the bonding agent of thermmohardening type, pressure sensitive or instantaneous bonding agent (cyanoacrylate) etc.
Then, the base material 50 that will be formed with the first optics adjustment layer 51 is installed on the manufacturing installation 30, and base material 50 is exported to guiding cylinder 31 1 sides (arrow A 4 directions among Fig. 9).At this moment, as shown in Figure 9, being mounted to first optics, to adjust layer 51 relative with guide pulley 31, and the bearing of trend of the first prism-like tectosome 5a of the first optics adjustment layer 51 and be formed at the bearing of trend quadrature of the lip-deep gathering sill 35 of guide pulley 31.
Then, as shown in Figure 9, make guide pulley 31 in Fig. 9 arrow A 3 directions rotations and with the arrow A 4 directions output of base material 50 in Fig. 9, simultaneously a plurality of second prism-like tectosome 5b are configured on the first prism-like tectosome 5a.At this moment, utilize ultraviolet lamp 34, make the following adhesive hardens that is coated in the second prism-like tectosome 5b across base material 50 irradiation ultraviolet radiations, be bonded in below the second prism-like tectosome 5b the first prism-like tectosome 5a above.In this embodiment, by like this second prism-like tectosome 5b and the first prism-like tectosome 5a being engaged, on the first optics adjustment layer 51, formed second optics and adjusted layer 52 (the step S25 among Figure 10).In addition, in this embodiment, illustrated and only second optics has been adjusted the example that layer 52 uses manufacturing installation shown in Figure 9 30 to form, but the present invention is not limited thereto, also can use manufacturing installation shown in Figure 9 30 when being formed at the first optics adjustment layer 51 on the base material 50.
In this embodiment, by as mentioned above, made the compound lens sheet 5 of the structure shown in Fig. 2 (A).In the manufacture method of this routine compound lens sheet, owing to do not need the first prism-like tectosome 5a is formed on the different base materials with the second prism-like tectosome 5b, so similarly to Example 1, can be easily and with low-cost production's compound lens sheet.And, the compound lens sheet of making of this example has also been carried out the evaluation of its optical characteristics similarly to Example 1, its result obtains result similarly to Example 1.
In addition, in the backlight unit and liquid crystal indicator that have used compound lens sheet 5 that should example, compared with prior art, can not only improve optical characteristics, but also can reduce the thickness of 1 part of base material, so can obtain thin and backlight unit and liquid crystal indicator cheaply.
Embodiment 3
In embodiment 3, made the compound lens sheet of structure similarly to Example 1 (structure shown in Figure 2).Just, in this embodiment, use with embodiment 1,2 diverse ways and made the compound lens sheet.And in this embodiment, the formation material and the size that constitute base material, the first prism-like tectosome and the second prism-like tectosome of compound lens sheet are changed into different with embodiment 1,2.
As base material 50, used polyethylene terephthalate (PET) sheet of thickness 50 μ m.
The first prism-like tectosome 5a forms with ultraviolet hardening resin.And the refractive index of the first prism-like tectosome 5a is 1.59.The cross sectional shape of the first prism-like tectosome 5a is made portion that climbs to the top of a mountain that drift angle is 90 isosceles triangles of spending and the shape promptly trapezoidal (general triangular) that the bottom surface is carried out complanation abreast, the width of the top in this cross section is made as about 8 μ m, following width is made as about 40 μ m, highly is made as about 16 μ m.And the shape in the cross section of the first prism-like tectosome 5a and size go up identical (evenly) at the bearing of trend (Y direction) of the first prism-like tectosome 5a.That is, the first prism-like tectosome 5a is formed with the thread-like member of trapezoidal shape.And, adjust in the layer 51 at first optics, the first prism-like tectosome 5a is configured on the base material 50 with the spacing of about 40 μ m.In addition, size and the spacing of the first prism-like tectosome 5a are stepped on and can suitably be changed according to required optical characteristics, purposes, but in this routine manufacture method, consider the processability (easiness of processing) of the second prism-like tectosome 5b described later, preferably with the spacing that is dimensioned to the first prism-like tectosome 5a of the first prism-like tectosome 5a in the scope of 7～50 μ m.
In addition, the second prism-like tectosome 5b material formation same with the first prism-like tectosome 5a.And the refractive index of the second prism-like tectosome 5b is 1.59.It is that the width on 90 degree, base is about 30 μ m, highly is the isosceles triangle of about 15 μ m that the shape in the cross section of this second prism-like tectosome 5b and size are on the bearing of trend (directions X) of the second prism-like tectosome 5b identical (evenly) that the cross sectional shape of the second prism-like tectosome 5b is made drift angle.That is, the second prism-like tectosome 5b forms with the thread-like member of triangle column.In addition, the interval between the second adjacent prism-like tectosome 5b is made as about 5 μ m, and the spacing of the second prism-like tectosome 5b is made as about 35 μ m.
[method for making of compound lens sheet]
The method for making of the compound lens sheet 5 that this is routine then, is described with reference to Figure 11.At first, prepare base material 50 (the step S31 among Figure 11).Then, on base material 50, form first optics that constitutes by a plurality of first prism-like tectosome 5a and adjusted layer 51 (the step S32 among Figure 11).Specifically, first optics that formed as described below is adjusted layer 51.At first, the preparation concaveconvex shape that is formed at the first optics adjustment layer, 51 lip-deep concaveconvex shape that will overturn is formed at lip-deep mould (not shown), and the male and fomale(M﹠F) and the base material 50 of this mould is opposed.Then, between the male and fomale(M﹠F) of mould and base material 50, fill ultraviolet hardening resin, with the surface of mold compresses at base material 50.Then, irradiation ultraviolet radiation makes the ultraviolet hardening resin sclerosis of having filled, afterwards, mould is peeled off from base material 50.In this embodiment, by will being formed on the base material 50 by the first optics adjustment layer 51 that a plurality of first prism-like tectosome 5a constitute like this.In addition, the male and fomale(M﹠F) of above-mentioned mould forms by cut.
Then, on the first optics adjustment layer 51, apply 10% aqueous solution of polyvinyl alcohol (PVA) (PVA, packing material) and make its dry sclerosis.Afterwards, with the coated surfaces water wiping of PVA and the last face of the first prism-like tectosome 5a is exposed.By like this, in the recess of the first optics adjustment layer 51, filled PVA (the step S33 among Figure 11).In addition, as required, packing material is being filled into after first optics adjusts in the recess of layer 51, the face that will apply packing material is with appropriate solvent wiping or grinding, thereby makes the last face of the first prism-like tectosome 5a expose also passable.
Then, on the first optics adjustment layer 51, form second optics that constitutes by a plurality of second prism-like tectosome 5b and adjusted layer 52 (the step S34 among Figure 11).Specifically, second optics that formed as described below is adjusted layer 52.At first, will the overturn concaveconvex shape of concaveconvex shape on surface of the second optics adjustment layer 52 of preparation is formed at lip-deep mould (not shown), and first optics that makes the male and fomale(M﹠F) of this mould and filled PVA is adjusted the surperficial opposed of layer 51.At this moment, adjust the bearing of trend quadrature of bearing of trend and the recess (with the corresponding part of the second prism-like tectosome 5b) of mould of the first prism-like tectosome 5a of layer 51 to being set to first optics.Then, between the male and fomale(M﹠F) of mould and the first optics adjustment layer 51, filled ultraviolet hardening resin.Then, with enough pressure mold compresses is adjusted on the surface of layer 51 at first optics, thereby made (with the corresponding part in gap between the second prism-like tectosome 5b) and first optics between the recess of mould adjust not residual ultraviolet hardening resin between layers 51 the surface.Then, irradiation ultraviolet radiation makes the ultraviolet hardening resin sclerosis of having filled, afterwards, mould is peeled off from base material 50.In this embodiment, adjust on the layer 51 by being formed on first optics like this by the second optics adjustment layer 52 that a plurality of second prism-like tectosome 5b constitute.At this moment, top and second optics of the first prism-like tectosome 5a of first optics adjustment layer 51 is adjusted the following bonding or heat bonding of the second prism-like tectosome 5b of layer 52, and the first prism-like tectosome 5a engages with the second prism-like tectosome 5b.
As mentioned above, if make the last face of the first prism-like tectosome 5a smooth, then the composition surface of the first prism-like tectosome 5a and the second prism-like tectosome 5b (bonding plane or heat bonding face) broadens, so can more stably the second prism-like tectosome 5b be fixed on the first prism-like tectosome 5a.
Then, be immersed in the compound lens sheet of making as mentioned above 5 in the water and apply ultrasound wave, removed the packing material (PVA) (the step S35 among Figure 11) in the compound lens sheet 5.And, in this routine compound lens sheet 5,,, therefore become the structure of removing packing material easily so contact with water by this gap filling material owing between the second prism-like tectosome 5b, be provided with the gap.Then, after fully removing packing material, make compound lens sheet 5 dryings.In this embodiment, by removing packing material with solvent like this, so, be fit to use the material that melts easily by the solvent that in any one of base material 50 and each optics adjustment layer 51,52, does not corrode as packing material.For example, can use PVA, polyvinyl pyrrolidone, (strain) Lin Yuanshe system プ Le ラ Application, alcohol soluble nylon etc.
In this embodiment, by as mentioned above, made compound lens sheet 5.In this manufacture method of compound lens sheet, owing to do not need the first prism-like tectosome 5a is respectively formed on the different base materials with the second prism-like tectosome 5b, so can be easily and with low-cost production's compound lens sheet.
In addition, be not limited to above-mentioned method that should example, also can make base material 50 self-deformations and form first optics and adjust layer 51 as the formation method of the first optics adjustment layer 51.For example, similarly to Example 1, also can use the concaveconvex shape that first classmate that will overturn is adjusted the concaveconvex shape of layer 51 to be formed at lip-deep mould and heat, and with this mold compresses on base material 50 and the concaveconvex shape of mould is transferred to thermal transfer on the base material.And the injection molding method etc. that also can use well-known extrinsion pressing or compression moulding method, injects molten resin in the model of optical structure is formed at inner mould forms first optics and adjusts layer 51.
The method that engages the first prism-like tectosome 5a and the second prism-like tectosome 5b also is not limited to above-mentioned method that should example, for example, as embodiment 2, methods such as use extrusion modling side are made the second prism-like tectosome 5b, adhesive-applying at least one of the lower face of facial on the first prism-like tectosome 5a and the second prism-like tectosome 5b engages the first prism-like tectosome 5a and the second prism-like tectosome 5b by bonding agent and also can.
In addition, in this embodiment, form second optics with the first optics adjustment layer, 51 same making and adjust layer 52, but the present invention is not limited thereto.Adjust other formation methods of layer 52 as second optics, for example can use and on the first optics adjustment layer 51, melt coating thermoplastic resin and form resin bed, and with heated mold by being pressed on this resin bed, thereby the thermal transfer of the concaveconvex shape of this die surface of transfer printing.And, also can use well-known extrinsion pressing or compression moulding method to wait and form second optics adjustment layer 52.
In this embodiment, illustrated when removing packing material the compound lens sheet is immersed in the example that carries out ultrasonic cleansing in the solvent, but the present invention is not limited thereto.For example, can not carry out ultrasonic cleansing, also can carry out solvent is heated to the temperature adjustment of set point of temperature etc.
[evaluation of optical characteristics]
Then, to the compound lens sheet of making of this example 5, the optical characteristics of Ce Dinging similarly to Example 1.Its result, in the backlight unit of embodiment 3, front face brightness relatively becomes about 1.15 times than the backlight unit with the comparative example that illustrates at embodiment 1, and field angle also becomes about 50 degree, has obtained the light characteristic better than comparative example.
Embodiment 4
In embodiment 4, made first optics and adjusted the compound lens sheet 40 that the bearing of trend of the second prism-like tectosome (second lens) that bearing of trend and second optics of the first prism-like tectosome (first lens) of layer adjusts layer is identical direction.
And this routine compound lens sheet 40 is made similarly to Example 3.Just, form second optics that is made of a plurality of second prism-like tectosomes 45 and adjust 43 o'clock (the step S34 among Figure 11) of layer on the first optics adjustment layer 4, the bearing of trend that forms the first prism-like tectosome 44 is identical direction with the bearing of trend of the second prism-like tectosome 45.In addition, make similarly to Example 3.
[structure of compound lens sheet]
The schematic configuration of the compound lens sheet that this is routine is illustrated among Figure 12.Figure 12 is the stereographic map of this routine compound lens sheet 40.As shown in figure 12, this routine compound lens sheet 40 comprises flat substrates 41, is formed at the first optics adjustment layer 42 on the base material 41, is formed at second optics that first optics adjusts on the layer 42 and adjusts layer 43.As base material 42, used base material similarly to Example 1 (PET sheet).And, in this embodiment, the top and second prism-like tectosome 45 of the first prism-like tectosome 44 below by bonding or heat bonding and engage.
As shown in figure 12, the first optics adjustment layer 42 have a plurality of along the Y direction (first direction) among Figure 12 extend and with the cross section of this bearing of trend quadrature be the trapezoidal first prism-like tectosome 44 (first lens).And, to adjust in the layer 42 at first optics, the first prism-like tectosome 44 is arranged along the directions X among Figure 12 (second direction), and the first adjacent prism-like tectosome 44 is each other.
The first prism-like tectosome 44 forms with ultraviolet hardening resin similarly to Example 1.And the refractive index of the first prism-like tectosome 44 is 1.58.In addition, in this embodiment, the size of the trapezoid cross section of the first prism-like tectosome 44 is set at, both sides' base angle all is 70 degree, the width of top is about 11.8 μ m, following width is about 30 μ m, highly is about 25 μ m, and the shape in the cross section of this first prism-like tectosome 44 and size go up identical (evenly) at the bearing of trend (Y direction) of the first prism-like tectosome 44.That is, the thread-like member with the trapezoidal column of the first prism-like tectosome, 44 usefulness forms.In addition, adjust in the layer 42, at first optics the spacing arrangement of the first prism-like tectosome 44 with about 30 μ m.As this example, by the cross section of the first prism-like tectosome 44 is done in echelon, the first prism-like tectosome 44 increases with the composition surface of the second prism-like tectosome 45 described later, thus the easy second prism-like tectosome 45, and can increase the intensity of compound lens sheet 40.
As shown in figure 12, the second optics adjustment layer 43 have a plurality of along the Y direction (second direction) among Figure 12 extend and with the cross section of this bearing of trend quadrature be the leg-of-mutton second prism-like tectosome 45 (second lens).And, adjust in the layer 43 at second optics, the second prism-like tectosome 45 is arranged along the directions X among Figure 12, and be formed on the first prism-like tectosome 45 roughly directly over.And, in this embodiment, as shown in figure 12, the following width of the second prism-like tectosome 45 is made narrower than the following width of the first prism-like tectosome 44, between the second adjacent prism-like tectosome 45, the gap is set and does not contact mutually.
The formation material of the second prism-like tectosome 45 has used the material same with the first prism-like tectosome 44.And the refractive index of the second prism-like tectosome 45 is 1.58.And, in this embodiment, equilateral triangle that following width is about 27 μ m (highly about 23.4 μ m) is made (promptly in the leg-of-mutton cross section of the second prism-like tectosome 45, the angle that comprises three angles of drift angle all is 60 degree), the shape in the cross section of this second prism-like tectosome 45 and size go up identical (evenly) at the bearing of trend (Y direction) of the second prism-like tectosome 45.That is, the thread-like member with the second prism-like tectosome, 45 usefulness triangle columns forms.And the gap between the second adjacent prism-like tectosome 45 is made as about 30 μ m.
Figure 13 represented should example the first optics adjustment layer 42 and the enlarged side view seen of the Y direction from Figure 12 of the second optics adjustment layer 43.As shown in figure 13, in this routine compound lens sheet 40, constitute from the junction surface 404 outstanding laterally structures with the outside wall surface 406a of the second prism-like tectosome 45 of connecting portion 404 adjacency of the first prism-like tectosome 44 and the second prism-like tectosome 45 and 406b.That is, in this routine compound lens sheet 40, form cantilevered construction in the part of the side of the optical structure that constitutes by the first prism-like tectosome 44 and the second prism-like tectosome 45.And, in this embodiment, with the outside wall surface 406a and the 406b (teat) of the second prism-like tectosome 45 of junction surface 404 adjacency of the first prism-like tectosome 44 and the second prism-like tectosome 45, be 180 degree with the angle θ that constitutes between the face 405 first prism-like tectosome 44 and that base material 41 is relative.Here, the area of the face 45a relative with base material 41 of the second prism-like tectosome 45 is also bigger than the area of the connecting portion 404 of the first prism-like tectosome 44 and the second prism-like tectosome 45.Here, with the outside wall surface 406a and the 406b (teat) of the second prism-like tectosome 45 of junction surface 404 adjacency of the first prism-like tectosome 44 and the second prism-like tectosome 45, with the angle θ that constitutes between the face 405 first prism-like tectosome 44 and that base material 41 is relative is the above occasions of 180 degree, the cross sectional shape of the optical structure that the first prism-like tectosome 44 shown in Figure 13 (A) and the second prism-like tectosome 45 constitute becomes tree shape (below, also be called tree-shaped optical structure or roof shape optical structure).Can strengthen the outside wall surface 406a that sees from the side of first optical structure and the area (area of teat) of 406b.Therefore, can improve the refraction effect of optical structure with cantilevered construction described later.
Illustrate in the part of the side of this optical structure to have the effect of the compound lens sheet 40 of cantilevered construction with reference to Figure 14 (A) and 14 (B).In addition, Figure 14 (A) is that the part that is illustrated in the side does not have the figure to the situation of the refraction of oblique incidence light on the optical structure of cantilevered construction, and Figure 14 (B) is that expression has the figure to the situation of the refraction of oblique incidence light on the optical structure of cantilevered construction in the part of side as present embodiment.
The occasion that does not have cantilevered construction in the part of the side of optical structure, for example the oblique incidence light 47 shown in Figure 14 (A) is only by optical structure 46 interface (only refraction once) with air.Yet in the occasion that has cantilevered construction as present embodiment in the part of the side of optical structure, shown in Figure 14 (B), oblique incidence light 47 can be by the interface (refrangible repeatedly) of optical structure and air repeatedly.Thereby the occasion be provided with cantilevered construction in the part of the side of optical structure as present embodiment shown in Figure 14 (B), can increase the amount of refraction to oblique incidence light 47, can improve optically focused.Can obtain being more suitable for the purposes that incident light reflected more sharp in needs, for example the optics of the lighting device of the light guide plate of the ejaculation light component many (brightness of penetrating light becomes peaked angle from more than normal direction 45 degree of sheet plane) that tilts very much of the normal direction that relative thin is unilateral or the backlight that will shine towards the normal direction of sheet plane from the incident direction of light of light source etc. etc.
In addition, above-mentioned optical structure with cantilevered construction is not limited to the compound lens sheet 40 shown in the image pattern 12 like that by the first prism-like tectosome 44 that extends along identical direction and the compound lens sheet of the second prism-like tectosome 45.For example, the compound lens sheet 5 shown in Fig. 2 (A) also can comprise the optical structure with cantilevered construction.Consider that the light 500 shown in Fig. 2 (A) incides the situation of compound lens sheet 5 here.Shown in Figure 13 (B), comprise that the cross section of the compound lens sheet 5 on the plane of working direction of light 500 has above-mentioned cantilevered construction.Like this, if the cross section on the plane in the working direction that comprises light (plane parallel with incident light) of the optical structure that is made of the first prism-like tectosome and the second prism-like tectosome has cantilevered construction, then can be subjected to having the repeatedly effect of refraction on the compound lens sheet of above-mentioned cantilevered construction to the light of this direction incident.Here, for example in compound lens sheet 40 shown in Figure 12, the face 45a relative with base material 41 of the second prism-like tectosome 45 need not be necessarily parallel with base material 41.For example, shown in Figure 13 (C),, also can realize above-mentioned tree structure (roof shape optical structure) and cantilevered construction even be the occasion of convex curved surface at face 45a.In this occasion, tilt towards the first prism-like tectosome with the outside wall surface of the second prism-like tectosome of junction surface adjacency.Therefore, above-mentioned angle θ becomes more than 180 degree.
In addition, as the method that oblique incidence light is increased amount of refraction, for example also can consider the overlapping a plurality of and method used of the optical sheet that will not have cantilevered construction in the part of the side of optical structure shown in Figure 14 (A), but in the optical sheet set of this structure, compare with the compound lens sheet of present embodiment, increase the number of optical sheet, thus the increase of the thickness of optics, and transmission scattering of light, absorption increase and optical property reduce.
[variation 1]
In the foregoing description 1～3, the example that the gap is set between second adjacent in the second optics adjustment layer prism-like tectosome has been described, but the present invention is not limited thereto, the second adjacent prism-like tectosome contacts with each other also passable.The one example is illustrated among Figure 15.Compound lens sheet 60 shown in Figure 15 is variation of the compound lens sheet 5 of embodiment 1, and the second adjacent prism-like tectosome 63 becomes the structure of contact in the second optics adjustment layer 62.In addition structure is identical with embodiment 1.And compound lens sheet 60 as shown in figure 15 for example can be made easily of embodiment 1 illustrated manufacture method.
[variation 2]
In the foregoing description 1～3, illustrated that having used the cross section as first optical structure that constitutes the first optics adjustment layer is the example of trapezoidal prism-like tectosome, but the present invention is not limited thereto.Using the cross section as first optical structure is that leg-of-mutton prism-like tectosome is also passable.The one example is illustrated among Figure 16.Compound lens sheet 70 shown in Figure 16 is variation of the compound lens sheet 5 of embodiment 1, and using the cross section as the first prism-like tectosome 72 that constitutes the first optics adjustment layer 71 is leg-of-mutton thread-like member.Structure in addition is identical with embodiment 1.The compound lens sheet 70 of variation 2 for example can be made easily of embodiment 1～3 illustrated manufacture method.
[variation 3]
In the foregoing description 1～3, illustrated that using the cross section as first optical structure that constitutes the first optics adjustment layer is trapezoidal thread-like member, and having used the cross section as second optical structure that constitutes the second optics adjustment layer is the example of leg-of-mutton thread-like member, but the present invention is not limited thereto.The cross sectional shape of first optical structure and second optical structure can suitably change according to required optical characteristics, purposes etc.For example, with first optical structure and second optical structure is that semicircular phacoidal structure body formation is also passable with the cross section.The one example is illustrated among Figure 17.Compound lens sheet 80 shown in Figure 17 is variation of the compound lens sheet 5 of embodiment 1, is that optical structure 83 usefulness the cross sections that will constitute the second optics adjustment layer 82 are the situation of the tectosome formation of semicircular lenticular shapes.And, same with variation 1 in the example of Figure 17, make the structure of adjacent lenses columnar structure body 83 contacts.Structure in addition is identical with embodiment 1.In the compound lens sheet of this structure, owing to can independently set the shape and the size of first optical structure and second optical structure, so can set the directions X among Figure 17 and the field angle of Y direction etc. arbitrarily.Especially, as shown in figure 17,, and second optical structure made the occasion of lentiform optical structure, the field angle of Y direction can be obtained visual field angular width than directions X at the tectosome of first optical structure being made prism-like.
As shown in figure 17 second optics is adjusted layer 82, can be in the illustrated manufacture method of the foregoing description 1～3, and the shape by suitable change male and fomale(M﹠F) of employed mould when forming the second optics adjustment layer 82 forms.In addition, in the example of Figure 17, though represented example with a plurality of phacoidal structure bodies formations of the second optical configuration body and function, but the present invention is not limited thereto, the a plurality of phacoidal structure bodies of the first optical configuration body and function can be constituted and a plurality of prism-like tectosomes of the second optical configuration body and function are constituted, also can between first optics adjust layer and second optics and adjust the both sides of layer and all use a plurality of phacoidal structure bodies formations.
[variation 4]
In the compound lens sheet of the foregoing description 1～4 and variation 1～3, the example that the first osteology tectosome and second optical structure all use cross sectional shape with regulation and the thread-like member of extending along the direction of regulation to form has been described, but the present invention is not limited thereto.First optical structure and/or second optical structure are not to form with thread-like member, but form passable with the parts of for example polygonal taper, coniform, hemispherical (semiellipse is spherical) etc. yet.The one example is illustrated among Figure 18 (A), (B).
Compound lens sheet 90 shown in Figure 18 (A) reaches (B) is to have formed the example that second optics that disposes a plurality of dome lens 93 is discretely adjusted layer 92 on the first optics adjustment layer 51 with structure similarly to Example 1.And the shape of dome lens 93 and size are all identical, and uniformly-spaced to dispose dome lens 93.In the compound lens sheet 90 of this structure, can control the directivity of optical characteristics arbitrarily.If be described more specifically, then as the compound lens sheet of embodiment 1～4 and variation 1～3, make up the occasion of wire lens (optical structures of wire) as first and second optical structure, produced the symmetry of optical characteristics according to the bearing of trend of wire lens.For example, in the occasion of first and second optical structure quadrature, produce symmetry with respect to the optical characteristics of directions X and Y direction.To this, the compound lens sheet of distortion of image example 4 is such, used the occasion of dome lens 93 as second optical structure, by this second optical structure, the symmetry of the optical characteristics in the X-Y plane improves (symmetry with respect to the axle of the normal direction of sheet plane improves (approaching rotational symmetry)), its result can improve the symmetry of the optical characteristics of compound lens sheet.Thus, obtain for example can reducing the effect of the directional dependence and so on of field angle characteristic.
[variation 5]
In the compound lens sheet of the foregoing description 1～4 and variation 1～4, illustrated that the part at the optical structure that is made of first and second lens has the example of cantilevered construction.For example, as shown in figure 21, first prism-like tectosome 302 that compound lens sheet 300 of the present invention has the base material 301 of sheet, extend along the left and right directions of Figure 21 and the second prism-like tectosome, 303, the second prism-like tectosomes (second lens) 303 that extend along the direction vertical with paper of Figure 21 are that cross section on first prism element 304 of asymmetric (not being isosceles triangle) and the face that is located at first prism element 304 is that asymmetrical a plurality of second prism element 305 constitutes also passable by the cross section.In compound lens sheet 300 as shown in figure 21, form stair-stepping by a plurality of second prism elements 305 are set on a face of first prism element 304, thereby can improve the utilization ratio of incident light and improve brightness.In addition, this first prism element and second prism element can be located on the first prism-like tectosome, also can be located on the both sides of the first prism-like tectosome and the second prism-like tectosome.
[variation 6]
In the compound lens sheet of the foregoing description 1～4 and variation 1～5, illustrated that all low applanation lenses have the example of the bonding part (composition surface) that engages with second lens, but the present invention is not limited thereto.The compound lens sheet of the present invention for example compound lens sheet 400 shown in the image pattern 22 is such, and it is also passable that only first lens of some have the bonding part that engages with second lens.Here, compound lens sheet 400 have the base material 401 of sheet, a plurality of first prism-like tectosomes 402 (first lens) of arranging in base material 401 upper edge prescribed direction and at a plurality of second prism-like tectosomes 403 (second lens) of the direction arrangement of the first prism-like tectosome, 402 upper edges and prescribed direction quadrature.Here, the first prism-like tectosome 402 comprises first parts 410 (first tectosome) with the junction surface 410a that engages with the bottom surface 403a of the second prism-like tectosome 403 and also low second parts 411 (second tectosome) than first parts 410.Like this, the first prism-like tectosome 402 has first parts 410 also higher than second parts 411, has only first parts 410 to have the junction surface 410a that engages with second lens.Therefore, as compound lens sheet 400 integral body, can reduce the area of bonding part.For by the bonding part from the first prism-like tectosome 402 to the light that the second prism-like tectosome 403 passes, do not act on optically focused effect according to the first prism-like tectosome 402.Therefore, in order to improve effect, preferably reduce the area of bonding part according to the optically focused effect of the first prism-like tectosome 402.As this variation, by only on the parts (first parts) of the part of the first prism-like tectosome 402, the junction surface being set, compare the area that can reduce the bonding part with the situation that the junction surface is set on the whole first prism-like tectosome 402, can improve optically focused effect according to the first prism-like tectosome.
In addition, in variation 6, first parts 410, second parts 411 all are roughly identical shaped.In other words, second parts 411 have the shape of triangle column, and first parts 410 also have the roughly trequetrous shape that has smooth junction surface 410a on top.Here, first parts and second parts need not be roughly the same shapes.For example, first parts are roughly the triangle column, and second parts are that semi-cylindrical is also passable.And in order to engage the second prism-like tectosome, the height that needs first parts of the first prism-like tectosome is certain, and is identical but its shape does not need, and can suitably design.In addition, the height of second parts need be lower than the height of first parts, but its shape need not be identical, can suitably design.And under the situation of second lens that can stably support and fix the second prism-like tectosome etc., the quantity of first parts with junction surface on the first prism-like tectosome and configuration can be set arbitrarily.In addition, the second prism-like tectosome also need not be identical shaped and can design arbitrarily.Also have, the orientation of the second prism-like tectosome and the first prism-like tectosome is quadrature necessarily, and can set arbitrarily.
In addition, in the compound lens sheet of the foregoing description 1～4 and variation 1～6, second optical structure that first optical structure that will constitute the first optics adjustment layer has been described and has constituted the second optics adjustment layer all is the example of (with equidistantly) configuration periodically, but the present invention is not limited thereto, for example, optical structure is also passable with irregular spacing configuration, and a plurality of cycles are configured also passable with mixing.
In the compound lens sheet of the foregoing description 1～4 and variation 1～6, illustrated to constitute shape and the whole identical examples of size that each optics is adjusted a plurality of optical structures of layer, but the present invention is not limited thereto.Also can make up optical structure and constitute each optics adjustment layer with difformity and size.
In the compound lens sheet of the foregoing description 1～4 and variation 1～6, illustrated to have the example that two optics are adjusted the compound lens sheet of layer, but, also the classmate can have been adjusted layer and be provided with more than 3 layers like the present invention is not limited thereto.This compound lens sheet can be made by the formation method of the second illustrated optics adjustment layer of the manufacture method of carrying out embodiment 1～4 repeatedly.
In addition, in the compound lens sheet of the foregoing description 1～3 and variation 1～6, the example that base material is formed with lens material has been described, but the present invention is not limited thereto, can be that diffusion sheet forms with the carbon lens material with base material also.This occasion need not to be provided with in addition diffusion sheet in backlight unit and liquid crystal indicator, so further slimming backlight unit and liquid crystal indicator.And, this occasion for example plays the effect of prismatic lens and diffusion sheet with 1 compound lens sheet, can reduce the number of the thin slice that constitutes backlight unit and liquid crystal indicator, so can further suppress transmission scattering of light, absorption, can further improve optical characteristics.
In the foregoing description 1～3, illustrated multilens member of the present invention is applied to the lighting device of the sidelight mode (edge light mode) that light source is configured in the sidepiece of light guide plate and the example of liquid crystal indicator, but the present invention is not limited thereto.Also compound lens sheet of the present invention can be applied to light source be located at light guide plate a side opposite with LCD panel one side under the lighting device and the liquid crystal indicator of type, also can obtain the effect same in this occasion with the effect of the foregoing description 1～3.
The present invention has the utilizability on the following industry.
In multilens member of the present invention, first lens group and second set of lenses form owing to engaging Optical structure is formed on the base material, thus can improve optical property, and can realize compound lens section The slimming of part, lighting device and liquid crystal indicator and cost degradation. Thereby, compound lens of the present invention Parts, lighting device and liquid crystal indicator are multilens member, the lighting devices that is applicable to various uses And liquid crystal indicator.

Claims (18)

1. a multilens member is characterized in that,
Have:
Base material with light transmission;
Be formed at a plurality of first lens on the above-mentioned base material; And
Be formed on above-mentioned a plurality of first lens and a plurality of second lens that in first relative, engage with above-mentioned a plurality of first lens with above-mentioned base material,
First mask of second lens have with the junction surface of first lens and from above-mentioned junction surface outstanding laterally teat.
2. multilens member according to claim 1 is characterized in that,
The angle that the teat of second lens and above-mentioned base material constitute is more than 180 degree.
3. multilens member according to claim 1 and 2 is characterized in that,
Second lens have from above-mentioned base material tapered shape on the direction of second lens.
4. according to each described multilens member in the claim 1～3, it is characterized in that,
The teat of second lens is parallel with above-mentioned base material.
5. according to each described multilens member in the claim 1～4, it is characterized in that,
Has the cavity of dividing by first lens and second lens.
6. according to each described multilens member in the claim 1～5, it is characterized in that,
First lens comprise a plurality of first thread-like member of extending to first direction, first thread-like member with the direction of first direction quadrature on arrange.
7. multilens member according to claim 6 is characterized in that,
Second lens comprise a plurality of second thread-like member of extending to second direction, second thread-like member with the direction of second direction quadrature on arrange.
8. multilens member according to claim 7 is characterized in that,
First direction and second direction quadrature.
9. multilens member according to claim 7 is characterized in that,
First direction is identical direction with second direction.
10. according to each described multilens member in the claim 6～9, it is characterized in that,
First lens trapezoidal with being shaped as of the cross section first direction quadrature.
11. multilens member according to claim 10 is characterized in that,
The triangle that is shaped as in second lens and the cross section second direction quadrature.
12. according to each described multilens member in the claim 1～11, it is characterized in that,
The second adjacent lens separate setting.
13. according to each described multilens member in the claim 1～12, it is characterized in that,
First lens comprise: have first tectosome at the junction surface that engages with second lens, from substrate towards the length of the direction of second lens second tectosome shorter than first tectosome.
14. multilens member according to claim 13 is characterized in that,
First tectosome and second tectosome are roughly the same shape.
15. a lighting device is characterized in that,
Have: light source and according to each described multilens member in the claim 1～14.
16. lighting device according to claim 15 is characterized in that,
Also have and be used for the light that will penetrate from above-mentioned light source light guide plate to above-mentioned multilens member guiding.
17. a liquid crystal indicator is characterized in that,
Have: light source, according to each described multilens member and liquid crystal display cells in the claim 1～14.
18. liquid crystal indicator according to claim 17 is characterized in that,
Also have and be used for the light that will penetrate from above-mentioned light source light guide plate to above-mentioned multilens member guiding.
CNA2008100914765A 2007-04-19 2008-04-17 Multilens member, illumination apparatus, and liquid crystal display apparatus Pending CN101290432A (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007-110818 2007-04-19
JP2007110818 2007-04-19
JP2008-089480 2008-03-31

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI404892B (en) * 2008-10-24 2013-08-11 Hon Hai Prec Ind Co Ltd Illumination device

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101291901B1 (en) * 2009-08-05 2013-07-31 엘지디스플레이 주식회사 Liquid crystal display device
US20110244187A1 (en) 2010-04-06 2011-10-06 Modilis Holdings Llc Internal Cavity Optics
JP6046367B2 (en) * 2011-04-12 2016-12-14 恵和株式会社 Optical unit, backlight unit, and liquid crystal display device

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TWI404892B (en) * 2008-10-24 2013-08-11 Hon Hai Prec Ind Co Ltd Illumination device

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