CN106104351A - Collimation lens - Google Patents
Collimation lens Download PDFInfo
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- CN106104351A CN106104351A CN201580014677.3A CN201580014677A CN106104351A CN 106104351 A CN106104351 A CN 106104351A CN 201580014677 A CN201580014677 A CN 201580014677A CN 106104351 A CN106104351 A CN 106104351A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/30—Collimators
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Abstract
The present invention provides the collimation lens that a kind of high NAization and lens transmitance are improved.According to the present invention, a kind of collimation lens is provided, it is the collimation lens 1 being made up of glass material, the light that the wavelength being penetrated by light source S is 380nm～700nm is converted to collimated light beam by this collimation lens, wherein, there is the face being provided with protuberance in the side contrary with the face towards light source, numerical aperture NA is more than 0.6, ratio t/f relative to focal length f for the center lens thickness t is less than 1.3, the largest face angle in the face being provided with protuberance is less than 65 °, refractive index nd is more than 1.59, the TiO of glass material2、WO3、Nb2O5、Bi2O3Total content be 0～40wt%.
Description
Technical field
The present invention relates to collimation lens, specifically, relate to be converted to the light from light source the standard of directional light
Straight lens.
Background technology
Known have a kind of collimation lens, and it is that the divergent beams from light sources such as LASER Light Sources are converted to the saturating of directional light
Mirror.
As this collimation lens, it is known to be for example attached to employ the projection type video display device of LASER Light Source
The collimation lens of optical system (patent document the 1st, 2).
For the collimation lens of patent document 1, owing to inhibiting the operating distance (working distance rising with temperature
From) change, therefore chromatic aberration characteristic is improved.Further, this lens are characterised by, to come from the wavelength of LASER Light Source
For the light of more than 375nm below 750nm as object, numerical aperture is less than more than 0.2 0.75, and the thickness of lens is set by (1)
When being set to f for the focal length of D, lens, D/f ＞ 0.85 sets up, and when Abbe number is set to ν d by (2), ν d ＞ 57 sets up.
In addition, for the collimation lens of patent document 2, in order to prevent the increasing of the image planes luminous point of the directional light after collimating
Greatly, the face (the 1st face) of the light source side of lens and the face (the 2nd face) of emitting side is made to be convex, in above-mentioned 1st face and the 2nd face
At least one face arranges diffraction structure.
Prior art literature
Patent document
Patent document 1: International Publication WO2010/116862
Patent document 2: Japanese Unexamined Patent Publication 2011-145387 publication
Content of the invention
Problems to be solved by the invention
For example in the case of for projection type video display device, collimation lens will be will be penetrated by light sources such as LASER Light Sources
Divergent beams be converted to collimated light beam as major function.In recent years, maximization and the high-precision refinement along with perspective view picture
Deng requiring, image display device is required to the raising of brightness.It is accompanied by this, in the optical system at image display device
The collimation lens being used, it is desirable to the raising of high NAization and lens transmitance.
The present invention be directed to above-mentioned problem and complete, it is intended that provide a kind of high NAization and lens transmitance to obtain
With the collimation lens improving.
Means for solving the above
According to the present invention, providing a kind of collimation lens, it is the collimation lens being made up of glass material, and this collimation lens will
The light that the wavelength that light source penetrates is 380nm～700nm is converted to collimated light beam, wherein, with the face towards above-mentioned light source
Contrary side has the face being provided with protuberance, and numerical aperture NA is more than 0.6, the ratio relative to focal length f for the center lens thickness t
Example t/f is less than 1.3, and the largest face angle in the above-mentioned face being provided with protuberance is less than 65 °, refractive index nd of above-mentioned glass material
It is more than 1.59, the TiO of above-mentioned glass material2、WO3、Nb2O5、Bi2O3Total content be 0～40wt%.
Invention effect
According to the present invention, provide the collimation lens that a kind of high NAization and lens transmitance are improved.
Brief description
Fig. 1 is the schematic side elevational view of the shape of the collimation lens preferred embodiment illustrating the present invention.
Fig. 2 is the block diagram of the composition in the light source portion schematically showing projection type video display device, this projection type image
Display device is mounted with the collimation lens of Fig. 1.
Fig. 3 is the block diagram of the composition in the light source portion schematically showing other projection type video display devices, these other throw
Shadow type image display device is mounted with the collimation lens of Fig. 1.
Fig. 4 is the schematic side elevational view of the shape of other collimation lenses preferred embodiment illustrating the present invention.
Fig. 5 is the schematic side elevational view of the shape of another collimation lens preferred embodiment illustrating the present invention.
Fig. 6 is the schematic side elevational view of the shape of the another collimation lens preferred embodiment illustrating the present invention.
Fig. 7 is for for illustrating the accompanying drawing of the composition of the aspheric case used in the collimation lens of the present invention.
Fig. 8 be illustrate largest face angle in the lens that the NA of the present invention is more than 0.6, lens emitting side face with
The accompanying drawing of the relation of the transmitance of lens.
Detailed description of the invention
Hereinafter, with reference to the accompanying drawings the preferred embodiment of the present invention is illustrated.Fig. 1 is to illustrate that the present invention's is preferred real
Execute the schematic side elevational view of the shape of the collimation lens 1 of mode.The collimation lens 1 of present embodiment is for for will be by laser aid
Deng the wavelength of light source injection be the glass lens that the light of 380nm to 700nm is converted to directional light.Specifically, for example exist
The optical system of the projection type video display devices such as liquid crystal projection apparatus uses.
As it is shown in figure 1, collimation lens 1 is simple lens, it has and is provided with ring-type edge part (U バ portion) in outer rim
So-called lenticular shapes.Specifically, in use towards light source S face (face of light source side) 2 and with this light source side
Two faces in the face (face of emitting side) 4 of face 2 opposite side possess convex shape.In the present embodiment, face 2 He of light source side
Two faces in the face 4 of emitting side are sphere.Further, collimation lens 1 possesses flange shape edge part 6 in outer edge.Need
Bright, edge part 6 for the lens fixed component being fixed in device when being attached to projection type video display device etc. is
Useful but it also may it is not provided with edge part 6.
The largest face angle in the face 2 of the emitting side of collimation lens 1 is preferably less than 65 °.This largest face angle is excellent further
Elect less than 55 ° as, be more preferably less than 50 °.It should be noted that face angle, θ it is meant that on lens face in effective diameter one
Normal in position, place and lens centre axle Z institute angle degree.When largest face angle is less than 65 °, there is following effect: mold
Mouldability and the lens processability such as grinding or attrition process are good, and the shape evaluation of lens can be made further to become easy.
Further, the t/f (t: center lens thickness, f: focal length) of collimation lens 1 is preferably less than 1.3.Its reason is,
If t/f is more than 1.3, then cannot guarantee sufficient operating distance (operating distance) (Working Distance in practicality；WD), example
WD such as more than 1mm.This t/f is more preferably less than 1.20.In addition to ensuring that sufficient WD, from the viewpoint of lens processability,
T/f is preferably 0.3～1.3, more preferably 0.3～0.85, more preferably 0.3～0.80.
Further, the upper and lower bound for t/f is described in detail.From the viewpoint of guaranteeing WD, the upper limit of t/f with
The order of less than 1.20, less than 1.00, less than 0.80, less than 0.70 is preferred.From the viewpoint of lens processability, t/f's
Lower limit is preferred with the order of more than 0.30, more than 0.40, more than 0.50.
It should be noted that in this manual, " operating distance (operating distance) (Working Distance；WD) it " is
Refer to, for example as it is shown in figure 1, light source S, in detail for luminous site and the face 2 of the light source side of collimation lens 1 of the point-like in light source
Closest to the distance between the position of light source.
In addition, numerical aperture NA of collimation lens 1 is more than 0.6.In order to ensure WD, largest face angle is made to be less than 65 °,
The upper limit of NA is for example preferably less than 0.9.
Further, it is possible to make the upper limit of NA be less than 0.85, less than 0.80 or less than 0.75.The lower limit that can make NA is super
Cross 0.6 (0.6 ＜), more than 0.65, more than 0.70 or more than 0.71.
In the method manufacturing collimation lens 1, there are the side based on precise compression molding or grinding, attrition process
Methods etc., use glass material in said method.
As the material forming collimation lens 1, for example, can use the glass material (glass with following 2 kinds composition systems
I, glass II).
Glass I is for containing B2O3, and containing selected from La2O3、Gd2O3And Y2O3At least one glass Deng rare-earth oxide
Glass material.
Glass II is for containing P2O5, and containing selected from Nb2O5、WO3、TiO2And Bi2O3At least one glass material.
For forming the glass material of collimation lens 1, in glass I or glass II, TiO2、WO3、Nb2O5、Bi2O3
Total content be preferably 0～40wt%.From the viewpoints such as raising moldability, TiO2、WO3、Nb2O5、Bi2O3Total content more excellent
Elect 0～28wt%, more preferably 0～16wt% as.
In addition, as the glass material forming collimation lens 1, in glass I, from the viewpoint of lens transmitance, excellent
Choosing, TiO2+WO3+Nb2O5+Bi2O3/ ((total content of rare-earth oxide)+Ta2O5)≤1.1.This ratio is more preferably
Less than 0.9, more preferably less than 0.5.
Refractive index nd of the material forming collimation lens 1 is more than 1.59.This refractive index nd is more preferably more than 1.68, enters
One step is preferably more than 1.75, is more preferably more than 1.80.Its reason is, by for such refractive index nd, can subtract
The largest face angle in the face of little emitting side.
For forming the Abbe number of glass material of collimation lens 1, from the height maintaining refractive index nd to be more than 1.59
From the viewpoint of refractive index, its upper limit is preferably less than 57.Further, from the viewpoint of high index of refraction, Abbe number
The upper limit is more preferably less than 50 or less than 45.The lower limit of Abbe number is not particularly limited, and can enumerate more than 20.
Further, from the viewpoint of the adaptive for precise compression molding, it is preferred that form the glass of collimation lens 1
Glass transformation temperature≤630 DEG C of glass material.
Related to this, in the glass material forming collimation lens 1, because contributing to reducing Tg, ZnO content is preferably
More than 3wt%, more preferably more than 8wt%, more preferably more than 10wt%.
In the collimation lens 1 of above-mentioned present embodiment, by WO3、Nb2O5、Bi2O3Total content suppression for 40wt% with
Under, therefore lens transmitance is improved, and can improve the utilization ratio of the injection light coming from LASER Light Source.
In addition, for collimation lens 1, the utilization ratio of the injection light coming from LASER Light Source is improved, therefore
The brightness of the perspective view picture in projection type video display device improves.
Now, LASER Light Source (laser diode (Laser Diode；LD)), the high output of especially green laser is
One problem, but high output is not easy to.But, if the transmitance of collimation lens is improved, though then laser output
Low, the brightness of perspective view picture also can improve, and can obtain sufficient perspective view picture.Further, it is also possible to realize low consumption electric power
Change.
Fig. 2 is the light source portion (illumination optical system schematically showing projection type video display device (such as liquid crystal projection apparatus)
System) 10 the block diagram of composition, this projection type video display device is mounted with the collimation lens 1 of present embodiment.
As in figure 2 it is shown, light source portion 10 possess produce respectively red light, 3 laser aid R of green light and blue light, G,
B, is each configured with collimation lens 1 in the downstream of individual laser (LD) device R, G, B.Collimation lens 1 will by each laser aid R,
The diverging light of G, B injection is converted to directional light.
In this light source portion 10, the wavelength-division multiplex system 12 possessing dichroic prism etc. is utilized to form to because of each collimation lens 1
Carry out wavelength-division multiplex for the red light of directional light, blue light and green light, and be sent to projection optical system.
Fig. 3 is the light source portion (illumination of the projection type video display device (such as liquid crystal projection apparatus) schematically showing other
Optical system) 14 the block diagram of composition, this projection type video display device is mounted with the collimation lens 1 of present embodiment.
As it is shown on figure 3, light source portion 14 possesses the such monochromatic source of black light laser aid (LD) 16, in monochromatic source
The downstream of 16 is configured with collimation lens 1.The light being penetrated by monochromatic source 16 is converted to directional light by collimation lens 1.
This light source portion 14 possesses converter section 18, this converter section 18 possess black light is converted to red light, blue light and
3 parts of green light.In this converter section 18,3 parts being converted to red light, blue light and green light configure successively
In the light path of black light, at regular intervals black light is converted to red light, blue light and green light.Further, by this
A little red light, blue light and green light deliver to projection optical system successively.
For example, the collimation lens 1 of this embodiment is the collimation lens possessing so-called biconvex shape, but the present invention is not
It is limited to the collimation lens of this biconvex shape.The collimation lens of the present invention has in the opposite side setting with the face towards light source
The face of protuberance, can possess specific condition further.
It may be thus possible, for example, to possess profile as shown in Figures 4 to 6.I.e., it is possible to be planoconvex spotlight as shown in Figure 4
104, wherein, do not possess edge part, be plane towards the face of light source S, the face 4 with face 2 opposite side towards light source S is convex
Face.By making the face towards light source be smooth face, guaranteeing that the aspect of operating distance (WD) and lens processability is favourable.
In addition, the problem of the bias that will not produce between the face 2 and the face 4 of opposition side of light source (centrifugal (decenter)).
It furthermore it is possible to for biconvex lens 105 as shown in Figure 5, wherein, do not possess edge part, is convex towards the face of light source S
Face, the face 4 with face 2 opposite side towards light source S is also convex surface.Further, it is possible to be male bend moon-shaped lens as shown in Figure 6
106, wherein, do not possess edge part, be concave surface towards the face 2 of light source S, the face 4 with the face opposite side towards light source S is convex
Face.
It in the collimation lens 1 of above-mentioned embodiment, is sphere towards two faces in the face 2 of light source and the face 4 of opposition side,
But above-mentioned face face or two faces can be aspherical.
Preferably, as it is shown in fig. 7, especially make the convex surface 4A of the opposition side in the face towards light source be following aspherical
(solid line), wherein, the radius of curvature (R of the periphery of paraxial radius of curvature1Or R2) more than the paraxial radius of curvature of sphere (dotted line)
(R0).Its reason is, the face angle at lens perimeter portion diminishes, and is favorably improved lens transmitance.Now, as it is shown in fig. 7,
Preferably increase from lens centre axle Z-direction periphery (lens end 1a) radius of curvature.Herein, paraxial radius of curvature refers in lens
Radius of curvature in mandrel.
The convex surface that can make the face of the opposite side in the face towards light source is aspherical and makes the convex of the face towards light source
Face or concave surface are aspherical.Thus, aberration characteristic is improved further.
For example can be for employing the glass material of embodiment 4 described later and the non-spherical lens with following specification.
(aspherical surface data)
Embodiment
Table 1 showing, the largest face angle in the face 4 that the lens shape for Fig. 4 obtains the emitting side of lens transmitance depends on
The constituent (composition) of the glass material being used during sustainability.
Fig. 8 is to illustrate the face (emitting side in Fig. 1 in the lens that the NA of the present invention is more than 0.6, lens emitting side
Face 4) largest face angle (i.e. the largest face angle in the face of the emitting side of transmitance is interdependent with the relation of the transmitance of lens
Property) accompanying drawing.It should be noted that t/f is less than 1.3.In the case of NA=0.60, t/f is made to be the 0.30th, the 0.40th, the 0.50th,
0.60、0.75、0.80、1.00、1.20、1.30；In the case of NA=0.65, t/f is made to be the 0.30th, the 0.40th, the 0.50th, the 0.60th,
0.75、0.80、1.00、1.20、1.30；In the case of NA=0.71, t/f is made to be the 0.40th, the 0.60th, the 0.71st, the 0.80th, the 0.90th,
1.00、1.10、1.20、1.28、1.30。
Specifically, for each glass material shown in table 1 below, Fig. 8 shows that the NA that wavelength is when 430nm (blue) is
0.6th, the 0.65th, the lens transmitance in the case of 0.71.Although it should be noted that not recording wavelength is 530nm (green), ripple
The data of a length of 650nm (red), but it is said that in general, the 450nm of the purple at short wavelength side for the inside transmitance of glass material
Drastically decline when below near.In this manual, using the lens transmitance of the wavelength (430nm) of this wavelength region as lens
The index of transmitance studies the characteristic of lens.
It should be noted that in fig. 8, the embodiment being labeled as the present application of dotted line area defined.
For the lens transmitance of the longitudinal axis of Fig. 8, maximum is set to 1 and is normalized.As shown in Figure 8,
Lens transmitance is good when largest face angle is below 55 °；During more than 65 °, drastically deteriorate.Wavelength 530nm, wavelength 650nm
Data also show the tendency as the wavelength 430nm of Fig. 8.
It should be noted that the lens transmitance of the collimation lens that largest face angle is more than 65 ° is at central part and periphery
There is very big difference, therefore for the directional light utilizing collimation lens and being converted to, by collimation lens
The light in heart portion and luminance difference can be produced by between the light of the periphery of central part periphery.From suppression luminance difference, improve thoroughly simultaneously
From the viewpoint of mirror transmitance, the upper limit of largest face angle with less than 65 °, less than 60 °, the order of less than 55 ° be preferred.From making
From the viewpoint of NA is more than 0.6, the lower limit of largest face angle is preferably more than 20 °.
Table 1 shows the largest face angle of each glass material and the index of lens transmitance.From the result of Fig. 8,
Big face angle be the situation of less than 65 ° zero to represent, the situation more than 65 ° with × represent.
[table 1]
For lens transmitance, as index with ◎ zero × represent.Herein, ◎ be grade A (more than 0.985), zero
For grade B (more than 0.970 and be less than 0.985), × for grade C (being less than 0.970).Value in above-mentioned () is to pass through lens
Rate has carried out normalized value.Meet both the necessary condition of largest face angle and lens transmitance index glass material with
The form of embodiment illustrates, ungratified glass material illustrates with the form of comparative example.
As shown in Table 1, in the glass material shown in embodiment 1～7, make largest face angle be less than 65 °, nd=1.59 with
Above, by TiO2、WO3、Nb2O5、Bi2O3Total content suppression be below 40wt%, such that it is able to obtain good lens transmitance
Characteristic.
As shown in Table 1, the glass material of comparative example 1 is unsatisfactory for the necessary condition of largest face angle.In addition, as shown in Table 1, right
TiO in glass2、WO3、Nb2O5、Bi2O3The many comparative example 2 of total content glass material for, lens transmitance is insufficient.
It is believed that the ultraviolet radiation absorption of above-mentioned metal ion in glass is big, lens transmitance is caused to deteriorate.
It is not limited to the above-mentioned embodiment of the present invention, permissible in the range of the technological thought described in claims
Carry out various change, deformation.
Hereinafter, referring to the drawings while the present invention is summarized.
As it is shown in figure 1, the collimation lens 1 of the 1st embodiment is the collimation lens being made up of glass material, it will be by light source
The wavelength of S injection is that the light of 380nm～700nm is converted to collimated light beam.Collimation lens 1 is contrary with the face 2 towards light source S
Side there is the face 4 being provided with protuberance.In this collimation lens 1, numerical aperture NA is more than 0.6, t/f be less than 1.3 (t: in
Heart lens thickness, f: focal length).Further, the largest face angle, θ in the face 4 being provided with protuberance is less than 65 °.In addition, form collimation
Refractive index nd of the glass material of lens 1 is more than 1.59, TiO2、WO3、Nb2O5、Bi2O3Total content be 0～40wt%.
In collimation lens 1, protuberance set on the face 4 of the opposite side with the face towards light source S can be non-
Sphere.
In addition, in collimation lens 1, can be tabular surface towards the face of light source S.
Further, in collimation lens 1, such as it is shown in figure 1, be provided with protuberance towards the face of light source S.
Can be aspherical at this towards protuberance set on the face of light source.
In addition, the collimation lens 106 of embodiment as shown in Figure 6 is like that, the present invention can be in the face towards light source S
It is provided with the composition of recess.
In the collimation lens of the present invention, light source S can be the light source for lamp optical system.
In addition, in the collimation lens of the present invention, this lamp optical system can be the photograph of projection type video display device
Bright optical system.
As shown in Figures 2 and 3, in the collimation lens of the present invention, light source S can be LASER Light Source.
Further, the present invention can be for using the lamp optical system of each collimation lens of above-mentioned summary.
Further, the present invention can be the projection type video display device possessing this lamp optical system.
Symbol description
1: collimation lens
2: the face of light source side
4: the face of emitting side
S: light source
T: center lens thickness
F: focal length
Claims (7)
1. a collimation lens, it is the collimation lens being made up of glass material, the wavelength that this collimation lens will be penetrated by light source
Light for 380nm～700nm is converted to collimated light beam, wherein,
There is the face being provided with protuberance in the side contrary with the face towards described light source,
Numerical aperture NA is more than 0.6,
Ratio t/f relative to focal length f for the center lens thickness t is less than 1.3,
The largest face angle in the described face being provided with protuberance is less than 65 °,
Refractive index nd of described glass material is more than 1.59,
The TiO of described glass material2、WO3、Nb2O5、Bi2O3Total content be 0～40wt%.
2. collimation lens as claimed in claim 1, wherein, set with on the face towards the face opposite side of described light source
Protuberance be aspherical.
3. collimation lens as claimed in claim 1 or 2, wherein, is tabular surface towards the face of described light source.
4. collimation lens as claimed in claim 1 or 2, wherein, is provided with protuberance on the face towards described light source.
5. collimation lens as claimed in claim 4, wherein, protuberance set on the face towards described light source is aspheric
Face.
6. collimation lens as claimed in claim 1 or 2, wherein, is provided with recess on the face towards described light source.
7. collimation lens as claimed in claim 6, wherein, recess set on the face towards described light source is aspheric
Face.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2014-072424 | 2014-03-31 | ||
| JP2014072424 | 2014-03-31 | ||
| PCT/JP2015/059949 WO2015152161A1 (en) | 2014-03-31 | 2015-03-30 | Collimator lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106104351A true CN106104351A (en) | 2016-11-09 |
Family
ID=54240484
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580014677.3A Pending CN106104351A (en) | 2014-03-31 | 2015-03-30 | Collimation lens |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP6647195B2 (en) |
| CN (1) | CN106104351A (en) |
| TW (1) | TWI687714B (en) |
| WO (1) | WO2015152161A1 (en) |
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| CN109188398A (en) * | 2018-09-26 | 2019-01-11 | 深圳市速腾聚创科技有限公司 | Laser radar, the collective system of fast and slow axis beam energy and convergence method |
| CN109725373A (en) * | 2019-03-07 | 2019-05-07 | 山东理工大学 | A kind of TO non-spherical lens for optical communication field |
| CN110858050A (en) * | 2018-08-22 | 2020-03-03 | 宁波舜宇车载光学技术有限公司 | Illumination collimation system and design method thereof |
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|---|---|---|---|---|
| JP6832588B2 (en) * | 2017-05-01 | 2021-02-24 | カンタム・ウシカタ株式会社 | Optical system equipment |
| WO2019198293A1 (en) * | 2018-04-11 | 2019-10-17 | ソニー株式会社 | Microscope system and medical light source device |
| JP2020057571A (en) * | 2018-10-04 | 2020-04-09 | カンタム・ウシカタ株式会社 | Optical system device and biconvex lens |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW201600880A (en) | 2016-01-01 |
| JP6647195B2 (en) | 2020-02-14 |
| JPWO2015152161A1 (en) | 2017-04-13 |
| TWI687714B (en) | 2020-03-11 |
| WO2015152161A1 (en) | 2015-10-08 |
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