CN207516711U - Projection lens - Google Patents
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- CN207516711U CN207516711U CN201721754652.XU CN201721754652U CN207516711U CN 207516711 U CN207516711 U CN 207516711U CN 201721754652 U CN201721754652 U CN 201721754652U CN 207516711 U CN207516711 U CN 207516711U
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Abstract
This application discloses a kind of projection lens, which is extremely sequentially included along optical axis by image source side into image side：The first lens with positive light coke；The second lens with negative power, image source side surface and image side surfaces are concave surface；Third lens with positive light coke or negative power；And the 4th lens with positive light coke, image side surfaces are convex surface.Wherein, the effective focal length f1 of total effective focal length f of projection lens and the first lens meets 2.0 ＜ f/f1 ＜ 3.5.
Description
Technical field
This application involves a kind of projection lens, more specifically, this application involves a kind of projection lens for including four lens.
Background technology
In recent years, being constantly progressive with science and technology, interactive device gradually rises, and the application range of projection lens is also increasingly
Extensively.Nowadays, chip technology is quickly grown with intelligent algorithm, is projected image to space object using optical projection lens and received and is somebody's turn to do
Picture signal, you can calculate the 3-D view with object space depth information.Specific method is as follows：Utilize optical projection mirror
Head projects the light that infra-red laser diode (LD) or vertical cavity surface emitting laser (VCSEL) are sent out to target object direction；
Projected light beam is realizing redistribution of the projected image on target object after diffractive-optical element (DOE)；Utilize camera shooting
The image that camera lens is projected onto on object receives, you can calculates comprising the 3-D view for being projected object space depth information.
3-D view with depth information can be further used for a variety of good application exploitations such as bio-identification.
In general, traditional projection lens eliminates various aberrations and improves resolution by using the mode for increasing lens numbers
Rate.But increasing lens numbers can cause the optics total length of projection lens to increase, and can be unfavorable for the miniaturization of camera lens.In addition,
General big field angle projection lens can also be big there are amount of distortion, the problems such as image quality difference, and can not be with optical diffraction
Element (DOE) collocation accurately realizes redistribution of the projected light beam on target object.
Utility model content
This application provides be applicable to portable electronic product, can at least solve or part solve it is of the prior art
The projection lens of above-mentioned at least one shortcoming.
On the one hand, this application provides such a projection lens, and the projection lens is along optical axis by image source side to imaging
Side sequentially may include：The first lens with positive light coke；The second lens with negative power, image source side surface and imaging
Side surface can be concave surface；Third lens with positive light coke or negative power；The 4th lens with positive light coke, into
Image side surface can be convex surface.Wherein, total effective focal length f of projection lens and the effective focal length f1 of the first lens can meet 2.0 ＜
F/f1 ＜ 3.5.
In one embodiment, the 4th lens in the center thickness CT4 on optical axis and the second lens on optical axis
Heart thickness CT2 can meet 1.5 ＜ CT4/CT2 ＜ 3.0.
In one embodiment, spacing distance T12 and the second lens on optical axis of the first lens and the second lens and
Spacing distance T23 of the third lens on optical axis can meet 0.8 ＜ T12/T23 ＜ 2.2.
In one embodiment, the image source side table of 8 and first lens of radius of curvature R of the image side surfaces of the 4th lens
The radius of curvature R 1 in face can meet -1.5≤R8/R1≤- 1.0.
In one embodiment, the image source side table of 4 and second lens of radius of curvature R of the image side surfaces of the second lens
The radius of curvature R 3 in face can meet -2.4 ＜ R4/R3 ＜ -0.8.
In one embodiment, total effective focal length f of projection lens and the effective focal length f2 of the second lens can meet f/
f2≤-4.0.Further, total effective focal length f of projection lens and the effective focal length f2 of the second lens can meet -10.0≤f/
f2≤-4.0。
In one embodiment, total effective focal length f of projection lens and the effective focal length f4 of the 4th lens can meet 1.5
＜ f/f4 ＜ 2.5.
In one embodiment, third lens can have positive light coke.
In one embodiment, total effective focal length f of the effective focal length f3 of third lens and projection lens can meet 1.0
＜ f3/f ＜ 5.5.
In one embodiment, the effective half bore DT42 of maximum of the image side surfaces of the 4th lens and the 4th lens
The effective half bore DT41 of maximum of image source side surface can meet 1.0 ＜ DT42/DT41 ＜ 1.4.
In one embodiment, in the light-wave band of 800nm to 1000nm, the light penetration of projection lens can be big
In 85%.
In one embodiment, the image source face of projection lens to the 4th lens distance of the image side surfaces on optical axis
Total effective focal length f of TTL and projection lens can meet TTL/f ＜ 1.0.
On the other hand, this application provides such a projection lens, the projection lens along optical axis by image source side into
Image side sequentially may include：The first lens with positive light coke；The second lens with negative power, image source side surface and into
Image side surface can be concave surface；Third lens with positive light coke or negative power；The 4th lens with positive light coke,
Image side surfaces can be convex surface.Wherein, total effective focal length f of projection lens and the effective focal length f4 of the 4th lens can meet 1.5
＜ f/f4 ＜ 2.5.
Another aspect, present invention also provides such a projection lens, the projection lens along optical axis by image source side extremely
Sequentially it may include into image side：The first lens with positive light coke；The second lens with negative power, image source side surface and
Image side surfaces can be concave surface；Third lens with positive light coke or negative power；The 4th lens with positive light coke,
Its image side surfaces can be convex surface.Wherein, total effective focal length f of projection lens and the effective focal length f2 of the second lens can meet f/
f2≤-4.0。
Another aspect, present invention also provides such a projection lens, the projection lens along optical axis by image source side extremely
Sequentially it may include into image side：The first lens with positive light coke；The second lens with negative power, image source side surface and
Image side surfaces can be concave surface；Third lens with positive light coke；The 4th lens with positive light coke, into image side table
Face can be convex surface.Wherein, total effective focal length f of the effective focal length f3 of third lens and projection lens can meet 1.0 ＜ f3/f ＜
5.5。
Another aspect, present invention also provides such a projection lens, the projection lens along optical axis by image source side extremely
Sequentially it may include into image side：The first lens with positive light coke；The second lens with negative power, image source side surface and
Image side surfaces can be concave surface；Third lens with positive light coke or negative power；The 4th lens with positive light coke,
Its image side surfaces can be convex surface.Wherein, the image source side of 8 and first lens of radius of curvature R of the image side surfaces of the 4th lens
The radius of curvature R 1 on surface can meet -1.5≤R8/R1≤- 1.0.
Another aspect, present invention also provides such a projection lens, the projection lens along optical axis by image source side extremely
Sequentially it may include into image side：The first lens with positive light coke；The second lens with negative power, image source side surface and
Image side surfaces can be concave surface；Third lens with positive light coke or negative power；The 4th lens with positive light coke,
Its image side surfaces can be convex surface.Wherein, the image source side of 4 and second lens of radius of curvature R of the image side surfaces of the second lens
The radius of curvature R 3 on surface can meet -2.4 ＜ R4/R3 ＜ -0.8.
Another aspect, present invention also provides such a projection lens, the projection lens along optical axis by image source side extremely
Sequentially it may include into image side：The first lens with positive light coke；The second lens with negative power, image source side surface and
Image side surfaces can be concave surface；Third lens with positive light coke or negative power；The 4th lens with positive light coke,
Its image side surfaces can be convex surface.Wherein, spacing distance T12 and the second lens on optical axis of the first lens and the second lens and
Spacing distance T23 of the third lens on optical axis can meet 0.8 ＜ T12/T23 ＜ 2.2.
Another aspect, present invention also provides such a projection lens, the projection lens along optical axis by image source side extremely
Sequentially it may include into image side：The first lens with positive light coke；The second lens with negative power, image source side surface and
Image side surfaces can be concave surface；Third lens with positive light coke or negative power；The 4th lens with positive light coke,
Its image side surfaces can be convex surface.Wherein, the effective half bore DT42 of maximum and the 4th lens of the image side surfaces of the 4th lens
The effective half bore DT41 of maximum of image source side surface can meet 1.0 ＜ DT42/DT41 ＜ 1.4.
The application employs multi-disc (for example, four) lens, by each power of lens of reasonable distribution, face type, each
Spacing etc. on axis between the center thickness of mirror and each lens so that above-mentioned projection lens has large aperture, miniaturization, Gao Cheng
As at least one advantageous effects such as qualities.
Description of the drawings
With reference to attached drawing, by the detailed description of following non-limiting embodiment, other features of the application, purpose and excellent
Point will be apparent.In the accompanying drawings：
Fig. 1 shows the structure diagram of the projection lens according to the embodiment of the present application 1；
Fig. 2 shows the distortion curves of the projection lens of embodiment 1；
Fig. 3 shows the structure diagram of the projection lens according to the embodiment of the present application 2；
Fig. 4 shows the distortion curve of the projection lens of embodiment 2；
Fig. 5 shows the structure diagram of the projection lens according to the embodiment of the present application 3；
Fig. 6 shows the distortion curve of the projection lens of embodiment 3；
Fig. 7 shows the structure diagram of the projection lens according to the embodiment of the present application 4；
Fig. 8 shows the distortion curve of the projection lens of embodiment 4；
Fig. 9 shows the structure diagram of the projection lens according to the embodiment of the present application 5；
Figure 10 shows the distortion curve of the projection lens of embodiment 5；
Figure 11 shows the structure diagram of the projection lens according to the embodiment of the present application 6；
Figure 12 shows the distortion curve of the projection lens of embodiment 6；
Figure 13 shows the structure diagram of the projection lens according to the embodiment of the present application 7；
Figure 14 shows the distortion curve of the projection lens of embodiment 7；
Figure 15 shows the structure diagram of the projection lens according to the embodiment of the present application 8；
Figure 16 shows the distortion curve of the projection lens of embodiment 8；
Figure 17 shows the structure diagrams of the projection lens according to the embodiment of the present application 9；
Figure 18 shows the distortion curve of the projection lens of embodiment 9.
Specific embodiment
Refer to the attached drawing is made more detailed description by the application in order to better understand to the various aspects of the application.It should
Understand, these are described in detail the only description to the illustrative embodiments of the application rather than limit the application in any way
Range.In the specification, the identical element of identical reference numbers.It states "and/or" and includes associated institute
Any and all combinations of one or more of list of items.
It should be noted that in the present specification, the statement of first, second grade is only used for a feature and another feature differentiation
It comes, and does not indicate that any restrictions to feature.Therefore, it is discussed below in the case of without departing substantially from teachings of the present application
First lens are also known as the second lens, and the second lens are also known as the first lens.
In the accompanying drawings, for convenience of description, thickness, the size and shape of lens are slightly exaggerated.Specifically, attached drawing
Shown in spherical surface or aspherical shape be illustrated by way of example.That is, spherical surface or aspherical shape are not limited to attached drawing
In the spherical surface that shows or aspherical shape.Attached drawing is merely illustrative and and non-critical drawn to scale.
Herein, near axis area refers to the region near optical axis.If lens surface is convex surface and does not define convex surface position
When putting, then it represents that the lens surface is convex surface near axis area is less than；If lens surface is concave surface and does not define the concave surface position
When, then it represents that the lens surface is concave surface near axis area is less than.It is known as image source near the surface of image source side in each lens
Side surface is known as image side surfaces in each lens near the surface into image side.
It will also be appreciated that term " comprising ", " including ", " having ", "comprising" and/or " including ", when in this theory
Represent there is stated feature, element and/or component, but do not preclude the presence or addition of one or more when being used in bright book
Other feature, element, component and/or combination thereof.In addition, ought the statement of such as at least one of " ... " appear in institute
When after the list of row feature, the individual component in entire listed feature rather than modification list is modified.In addition, when describing this
During the embodiment of application, represented " one or more embodiments of the application " using "available".Also, term " illustrative "
It is intended to refer to example or illustration.
Unless otherwise defined, otherwise all terms used herein be respectively provided with (including technical terms and scientific words) with
The application one skilled in the art's is generally understood identical meaning.It will also be appreciated that term (such as in everyday words
Term defined in allusion quotation) meaning consistent with their meanings in the context of the relevant technologies should be interpreted as having, and
It will not be explained with idealization or excessively formal sense, unless clearly so limiting herein.
It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
The feature of the application, principle and other aspects are described in detail below.
Such as four lens with focal power may include according to the projection lens of the application illustrative embodiments, that is,
First lens, the second lens, third lens and the 4th lens.This four lens are extremely sequentially arranged along optical axis by image source side into image side
Row.
In the exemplary embodiment, the first lens can have positive light coke；Second lens can have negative power, picture
Source surface can be concave surface, and image side surfaces can be concave surface；Third lens have positive light coke or negative power；4th lens can
With positive light coke, image side surfaces can be convex surface.The first lens with positive light coke, are advantageously implemented optical projection system
Image source side telecentricity improves the outer visual field light-inletting quantity of optical projection system axis, increases projected image resolution ratio, brightness and uniformity；Have
Second lens of negative power, image source side surface are concave surface, and image side surfaces are concave surface, are conducive to image source side interarea far from picture
The miniaturization of camera lens so as to shorten the optics total length TTL of optical projection system, is realized in source；Third lens with focal power can have
Imitate the incident angle of the outer field rays of adjustment axis, the outer visual field aberration of correction axis；The 4th lens with positive light coke, are conducive to contract
The optics total length TTL of short optical projection system, the image side surfaces of the 4th lens are conducive to reduce optical projection system spherical aberration simultaneously for convex surface
Improve the image quality of optical projection system.
In the exemplary embodiment, the image source side surface of the first lens can be convex surface.
In the exemplary embodiment, third lens can have positive light coke, and image source side surface can be concave surface, into image side
Surface can be convex surface.
In the exemplary embodiment, the image source side surface of the 4th lens can be concave surface.
In the exemplary embodiment, the projection lens of the application can meet conditional f/f2≤- 4.0, wherein, f is throws
Total effective focal length of shadow camera lens, f2 are the effective focal length of the second lens.More specifically, f and f2 can further meet -10.0≤f/
F2≤- 4.0, for example, -9.80≤f/f2≤- 5.41.Meet conditional f/f2≤- 4.0, be conducive to improving optical projection system
Preferable balance is obtained between image quality and the miniaturization for realizing optical projection system.
In the exemplary embodiment, the projection lens of the application can meet 2.0 ＜ f/f1 ＜ 3.5 of conditional, wherein, f
For total effective focal length of projection lens, f1 is the effective focal length of the first lens.More specifically, f and f1 can further meet 2.30
＜ f/f1 ＜ 3.40, for example, 2.41≤f/f1≤3.33.Meet 2.0 ＜ f/f1 ＜ 3.5 of conditional, be advantageously implemented projection system
The image source side telecentricity of system so as to shorten the optics total length TTL of optical projection system, and then is conducive in the optics for shortening optical projection system
Preferable balance is obtained between total length TTL and the image quality for improving optical projection system.
In the exemplary embodiment, the projection lens of the application is in about 800nm to the light-wave band of about 1000nm, light
Line transmitance is more than 85%.It is such to be provided with to improve the transmitance that near infrared light penetrates projection lens, to obtain more
The near-infrared projected image of high brightness.
In the exemplary embodiment, the projection lens of the application can meet 1.0 ＜ f3/f ＜ 5.5 of conditional, wherein, f3
For the effective focal length of third lens, f is total effective focal length of projection lens.More specifically, f3 and f can further meet 1.32≤
f3/f≤5.39.Meet 1.0 ＜ f3/f ＜ 5.5 of conditional, be conducive to adjust optical power profile, avoid excessive due to focal power
It concentrates and increases the tolerance sensitivity of optical projection system；Meanwhile when one or all lens in the second lens and the 4th lens
During lens for glass material, meet 1.0 ＜ f3/f ＜ 5.5 of conditional and be conducive to keep picture in the case where temperature changes
The stabilization in face, so as to be conducive to improve the temperature characterisitic of optical projection system.
In the exemplary embodiment, the projection lens of the application can meet conditional -1.5≤R8/R1≤- 1.0,
In, R8 is the radius of curvature of the image side surfaces of the 4th lens, and R1 is the radius of curvature of the image source side surface of the first lens.More
Body, R8 and R1 can further meet -1.35≤R8/R1≤- 1.00.Meet conditional -1.5≤R8/R1≤- 1.0, be conducive to
Eliminate distortion and the aberration of optical projection system.
In the exemplary embodiment, the projection lens of the application can meet 1.5 ＜ f/f4 ＜ 2.5 of conditional, wherein, f
For total effective focal length of projection lens, f4 is the effective focal length of the 4th lens.More specifically, f and f4 can further meet 1.63
≤f/f4≤2.39.Meet 1.5 ＜ f/f4 ＜ 2.5 of conditional, advantageously reduce the tolerance sensitivity of the 4th lens；Meanwhile when
When 4th lens are the lens of glass material, the temperature sensitivity for reducing optical projection system is also helped, to ensure in larger temperature
Higher projection quality can be realized in the range of degree.
In the exemplary embodiment, the projection lens of the application can meet -2.4 ＜ R4/R3 ＜ -0.8 of conditional,
In, R4 is the radius of curvature of the image side surfaces of the second lens, and R3 is the radius of curvature of the image source side surface of the second lens.More
Body, R4 and R3 can further meet -2.25 ＜ R4/R3 ＜ -0.85, for example, -2.19≤R4/R3≤- 0.96.Meet condition
- 2.4 ＜ R4/R3 ＜ -0.8 of formula is conducive to reduce the incidence of each visual field and shooting angle at the second lens, to reduce the second lens
Tolerance sensitivity, and then improve the production yield of projection lens.
In the exemplary embodiment, the projection lens of the application can meet 0.8 ＜ T12/T23 ＜ 2.2 of conditional,
In, T12 is the spacing distance of the first lens and the second lens on optical axis, and T23 is the second lens and third lens on optical axis
Spacing distance.More specifically, T12 and T23 can further meet 0.88≤T12/T23≤2.11.Meet 0.8 ＜ of conditional
T12/T23 ＜ 2.2 are conducive to the spacing distance between each lens of reasonable distribution, light path distribution are adjusted, so as to reduce optical projection system
Tolerance sensitivity；Meanwhile be conducive to the production yield that lens assemble and promote optical projection system.
In the exemplary embodiment, the projection lens of the application can meet 1.5 ＜ CT4/CT2 ＜ 3.0 of conditional,
In, CT4 is the 4th lens in the center thickness on optical axis, and CT2 is the second lens in the center thickness on optical axis.More specifically,
CT4 and CT2 can further meet 1.59≤CT4/CT2≤2.82.Meet 1.5 ＜ CT4/CT2 ＜ 3.0 of conditional, be conducive to
Shorten the optics total length TTL of optical projection system and improve and obtained preferably between the second lens, the 4th lens process for machining and manufacturing
Balance.
In the exemplary embodiment, the projection lens of the application can meet 1.0 ＜ DT42/DT41 ＜ 1.4 of conditional,
In, DT42 is effective half bore of maximum of the image side surfaces of the 4th lens, DT41 be the image source side surface of the 4th lens most
Big effective half bore.More specifically, DT42 and DT41 can further meet 1.05 ＜ DT42/DT41 ＜ 1.25, for example, 1.13≤
DT42/DT41≤1.19.Meet 1.0 ＜ DT42/DT41 ＜ 1.4 of conditional, be conducive to shorten the optics total length of optical projection system
TTL is minimized with realizing；Meanwhile be conducive to preferably balance the tolerance sensitivity of optical projection system.
In the exemplary embodiment, the projection lens of the application can meet conditional TTL/f ＜ 1.0, wherein, TTL is
Distance on image source face to the axis of the image side surfaces of the 4th lens, f are total effective focal length of projection lens.More specifically, TTL and
F can further meet 0.60 ＜ TTL/f ＜ 0.90, for example, 0.67≤TTL/f≤0.82.The rationally ratio of control TTL and f, has
Conducive to the miniaturization for keeping projection lens.
In the exemplary embodiment, above-mentioned projection lens may also include at least one diaphragm, to promote the imaging of camera lens
Quality.For example, diaphragm can be arranged as required in the 4th lens and between image side.
Optionally, above-mentioned projection lens may also include other well known optical projection elements, for example, prism, field lens etc..It can
Selection of land, above-mentioned projection lens can be jointly used cooperatively with diffraction element (DOE).
Such as four lens can be used according to the projection lens of the above embodiment of the application, it is each by reasonable distribution
Spacing etc. on axis between the focal power of mirror, face type, the center thickness of each lens and each lens so that projection lens has big
The advantageous effects such as aperture, miniaturization, high image quality.
In presently filed embodiment, at least one of minute surface of each lens is aspherical mirror.Non-spherical lens
The characteristics of be：From lens centre to lens perimeter, curvature is consecutive variations.It is constant with having from lens centre to lens perimeter
The spherical lens of curvature is different, and non-spherical lens has more preferably radius of curvature characteristic, and there is improvement to distort aberration and improve picture
The advantages of dissipating aberration.After non-spherical lens, the aberration occurred when imaging can be eliminated as much as possible, so as to improve
Image quality.
However, it will be understood by those of skill in the art that without departing from this application claims technical solution situation
Under, the lens numbers for forming projection lens can be changed, to obtain each result and the advantage described in this specification.Though for example,
It is so described by taking four lens as an example in embodiments, but the projection lens is not limited to include four lens.If
It needs, which may also include the lens of other quantity.
The specific embodiment for the projection lens for being applicable to the above embodiment is further described with reference to the accompanying drawings.
Embodiment 1
Referring to Fig. 1 to Fig. 2 descriptions according to the projection lens of the embodiment of the present application 1.Fig. 1 is shown according to the application reality
Apply the structure diagram of the projection lens of example 1.
As shown in Figure 1, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 1 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the projection lens of embodiment 1
Coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 1
As shown in Table 1, the image source side surface of any one lens and into image side table in the first lens E1 to the 4th lens E4
Face is aspherical.In the present embodiment, the face type x of each non-spherical lens is available but is not limited to following aspherical formula progress
It limits：
Wherein, x be it is aspherical along optical axis direction when being highly the position of h, away from aspheric vertex of surface apart from rise；C is
Aspherical paraxial curvature, c=1/R (that is, paraxial curvature c is the inverse of 1 mean curvature radius R of upper table)；K for circular cone coefficient (
It has been provided in table 1)；Ai is the correction factor of aspherical i-th-th ranks.The following table 2 is given available for each aspherical in embodiment 1
The high order term coefficient A of minute surface S1-S84、A6、A8、A10、A12、A14And A16。
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 4.8050E-01 | -8.3005E-01 | 1.7007E+00 | 1.3699E+00 | -7.8838E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 4.1027E-01 | 1.4452E+00 | -1.8285E+01 | 1.4913E+02 | -9.1189E+02 | 2.4319E+03 | -2.2519E+03 |
| S3 | -1.0845E+00 | 1.5981E+00 | -1.6735E+02 | 2.9643E+03 | -3.4588E+04 | 1.5639E+05 | -2.8757E+04 |
| S4 | 2.9957E+00 | -1.8077E+01 | 2.2344E+02 | -2.8640E+03 | 2.8388E+04 | -1.6852E+05 | 4.3326E+05 |
| S5 | -2.0589E-01 | 2.8100E-01 | 1.0381E+01 | -7.6181E+01 | 2.8153E+02 | -4.9059E+02 | 3.2576E+02 |
| S6 | 1.7615E-01 | -5.6099E+00 | 5.5872E+01 | -2.8463E+02 | 7.7772E+02 | -1.0827E+03 | 6.2231E+02 |
| S7 | 1.6034E-01 | -3.6484E+00 | 3.2761E+01 | -1.5811E+02 | 4.0391E+02 | -5.2148E+02 | 2.6922E+02 |
| S8 | -2.1000E-04 | -7.8510E-02 | 2.2691E-01 | -2.5163E-01 | -8.7662E-01 | 2.1970E+00 | -1.4572E+00 |
Table 2
Table 3 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 1.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.50 | 1.45 | -0.59 | 5.96 | 2.31 |
Table 3
Projection lens in embodiment 1 meets：
F/f2=-7.63, wherein, f is total effective focal length of projection lens, and f2 is the effective focal length of the second lens E2；
F/f1=3.10, wherein, f is total effective focal length of projection lens, and f1 is the effective focal length of the first lens E1；
F3/f=1.32, wherein, f3 is the effective focal length of third lens E3, and f is total effective focal length of projection lens；
R8/R1=-1.35, wherein, R8 is the radius of curvature of the image side surfaces S8 of the 4th lens E4, and R1 is the first lens
The radius of curvature of the image source side surface S1 of E1；
F/f4=1.95, wherein, f is total effective focal length of projection lens, and f4 is the effective focal length of the 4th lens E4；
R4/R3=-1.25, wherein, R4 is the radius of curvature of the image side surfaces S4 of the second lens E2, and R3 is the second lens
The radius of curvature of the image source side surface S3 of E2；
T12/T23=0.91, wherein, T12 be the spacing distance of the first lens E1 and the second lens E2 on optical axis, T23
For the spacing distance of the second lens E2 and third lens E3 on optical axis；
CT4/CT2=2.14, wherein, CT4 is the 4th lens E4 in the center thickness on optical axis, and CT2 is the second lens E2
In the center thickness on optical axis；
DT42/DT41=1.19, wherein, effective half bore of maximum that DT42 is the image side surfaces S8 of the 4th lens E4,
Effective half bore of maximum that DT41 is the image source side surface S7 of the 4th lens E4；
TTL/f=0.73, wherein, TTL be image source face OBJ to the image side surfaces S8 of the 4th lens E4 axis on distance, f
Total effective focal length for projection lens.
Fig. 2 shows the distortion curves of the projection lens of embodiment 1, represent the distortion size in the case of different visual angles
Value.As can be seen from FIG. 2, the projection lens given by embodiment 1 can realize good image quality.
Embodiment 2
Referring to Fig. 3 to Fig. 4 descriptions according to the projection lens of the embodiment of the present application 2.In the present embodiment and following implementation
In example, for brevity, by clipped description similar to Example 1.Fig. 3 shows the throwing according to the embodiment of the present application 2
The structure diagram of shadow camera lens.
As shown in figure 3, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 4 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the projection lens of embodiment 2
Coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 4
As shown in Table 4, in example 2, in the first lens E1 to the 4th lens E4 any one lens image source side table
Face and image side surfaces are aspherical.Table 5 shows the high order term coefficient available for aspherical mirror each in embodiment 2,
In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 8.0505E-01 | -4.6397E+00 | 2.2410E+01 | -5.7501E+01 | 6.0022E+01 | 1.3993E+01 | -5.6479E+01 |
| S2 | 4.0667E-01 | -5.2418E+00 | 4.3291E+01 | -2.4489E+02 | 7.6653E+02 | -1.2375E+03 | 8.0725E+02 |
| S3 | -6.2410E-02 | -3.5615E+01 | 8.5155E+02 | -1.2697E+04 | 1.0081E+05 | -3.6719E+05 | 4.9109E+05 |
| S4 | 5.6913E-01 | -2.4765E+01 | 9.0322E+02 | -1.9548E+04 | 2.3017E+05 | -1.3869E+06 | 3.4008E+06 |
| S5 | -1.1151E-01 | 3.6489E+00 | -6.7726E+01 | 6.7578E+02 | -3.5458E+03 | 9.2598E+03 | -9.2559E+03 |
| S6 | -1.3269E-01 | 5.7543E+00 | -7.3179E+01 | 4.1421E+02 | -1.1769E+03 | 1.5811E+03 | -7.5435E+02 |
| S7 | -2.3580E-02 | 2.2522E+00 | -2.7978E+01 | 1.4827E+02 | -3.9351E+02 | 5.0908E+02 | -2.5340E+02 |
| S8 | 1.3259E-02 | -1.8760E-01 | 1.5473E+00 | -6.4581E+00 | 1.4063E+01 | -1.5225E+01 | 6.4491E+00 |
Table 5
Table 6 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 2.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.50 | 1.50 | -0.67 | 6.59 | 2.76 |
Table 6
Fig. 4 shows the distortion curve of the projection lens of embodiment 2, represents the distortion size in the case of different visual angles
Value.As can be seen from FIG. 4, the projection lens given by embodiment 2 can realize good image quality.
Embodiment 3
The projection lens according to the embodiment of the present application 3 is described referring to Fig. 5 to Fig. 6.Fig. 5 is shown according to the application
The structure diagram of the projection lens of embodiment 3.
As shown in figure 5, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 7 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the projection lens of embodiment 3
Coefficient, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 7
As shown in Table 7, in embodiment 3, in the first lens E1 to the 4th lens E4 any one lens image source side table
Face and image side surfaces are aspherical.Table 8 shows the high order term coefficient available for aspherical mirror each in embodiment 3,
In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.1828E-01 | -8.4239E-01 | 2.0193E+00 | -2.0745E+00 | 6.7952E-01 | 0.0000E+00 | 0.0000E+00 |
| S2 | -3.2000E-16 | 4.6500E-25 | -2.7000E-34 | 8.0100E-44 | -1.3000E-53 | 1.0200E-63 | -3.3000E-74 |
| S3 | -7.8373E-01 | 1.3882E+01 | -2.9568E+02 | 2.3124E+03 | -6.9984E+03 | 9.2250E+03 | -4.4563E+03 |
| S4 | 1.5988E+00 | -2.7821E+00 | 2.5120E+01 | -6.4877E+01 | 7.1942E+01 | -3.6901E+01 | 7.2038E+00 |
| S5 | -2.7637E-01 | 8.4123E-01 | -4.8490E-01 | 1.3481E-01 | -1.9930E-02 | 1.5060E-03 | -4.6000E-05 |
| S6 | -3.7548E-01 | -1.9231E+00 | 1.7355E+01 | -5.8802E+01 | 1.1541E+02 | -1.1717E+02 | 4.6130E+01 |
| S7 | -4.2447E-01 | -8.0749E-01 | 7.5516E+00 | -1.5598E+01 | 6.5587E+00 | 2.6534E+01 | -3.0344E+01 |
| S8 | -8.8690E-02 | -4.6500E-02 | 2.5370E-02 | -1.6914E-01 | 6.8726E-01 | -1.2376E+00 | 9.0872E-01 |
Table 8
Table 9 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 3.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.49 | 1.54 | -0.65 | 6.18 | 2.31 |
Table 9
Fig. 6 shows the distortion curve of the projection lens of embodiment 3, represents the distortion size in the case of different visual angles
Value.As can be seen from FIG. 6, the projection lens given by embodiment 3 can realize good image quality.
Embodiment 4
The projection lens according to the embodiment of the present application 4 is described referring to Fig. 7 to Fig. 8.Fig. 7 is shown according to the application
The structure diagram of the projection lens of embodiment 4.
As shown in fig. 7, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 10 shows surface type, radius of curvature, thickness, material and the circle of each lens of the projection lens of embodiment 4
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 10
As shown in Table 10, in example 4, in the first lens E1 to the 4th lens E4 any one lens image source side table
Face and image side surfaces are aspherical.Table 11 shows the high order term coefficient available for aspherical mirror each in embodiment 4,
In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 5.9190E-01 | -9.5682E-01 | 1.5246E+00 | 1.4408E+00 | -1.8549E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 6.7315E-01 | 5.7754E+00 | -6.1253E+01 | 4.1049E+02 | -1.2852E+03 | 1.8107E+03 | -9.4551E+02 |
| S3 | -6.1430E-02 | -1.4837E+01 | 5.6080E+02 | -1.2459E+04 | 1.4614E+05 | -8.9912E+05 | 2.2470E+06 |
| S4 | 1.7728E+00 | -7.6106E+00 | 9.0300E+01 | -1.0970E+03 | 8.7712E+03 | -3.8775E+04 | 7.1022E+04 |
| S5 | -3.5555E-01 | 8.0956E-01 | 8.4511E+00 | -7.6330E+01 | 3.0721E+02 | -5.9416E+02 | 4.4787E+02 |
| S6 | 1.4957E-01 | -7.1230E-02 | 2.7423E+00 | -1.2480E+01 | 3.4176E+01 | -4.7353E+01 | 2.8473E+01 |
Table 11
Table 12 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 4.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.49 | 1.86 | -0.68 | 7.74 | 1.92 |
Table 12
Fig. 8 shows the distortion curve of the projection lens of embodiment 4, represents the distortion size in the case of different visual angles
Value.As can be seen from FIG. 8, the projection lens given by embodiment 4 can realize good image quality.
Embodiment 5
The projection lens according to the embodiment of the present application 5 is described referring to Fig. 9 to Figure 10.Fig. 9 is shown according to this Shen
Please embodiment 5 projection lens structure diagram.
As shown in figure 9, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 13 shows surface type, radius of curvature, thickness, material and the circle of each lens of the projection lens of embodiment 5
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 13
As shown in Table 13, in embodiment 5, the image source side table of any one lens in the first lens E1 to the 4th lens E4
Face and image side surfaces are aspherical.Table 14 shows the high order term coefficient available for aspherical mirror each in embodiment 5,
In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 3.6680E-01 | -3.6954E-01 | -1.8866E-01 | 5.9421E+00 | -8.9292E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 1.6699E-01 | 1.8126E+00 | -2.5869E+01 | 1.8203E+02 | -6.4777E+02 | 1.0744E+03 | -6.7169E+02 |
| S3 | 1.1579E+00 | -1.5512E+01 | 3.0118E+02 | -9.6116E+03 | 1.4343E+05 | -1.0553E+06 | 3.0382E+06 |
| S4 | 7.4835E+00 | -1.0085E+02 | 1.7141E+03 | -2.2154E+04 | 1.7805E+05 | -7.8965E+05 | 1.4717E+06 |
| S5 | -1.1910E+00 | 1.2392E+01 | -6.2949E+01 | 2.0999E+02 | -4.3731E+02 | 5.2803E+02 | -2.9109E+02 |
| S6 | -2.0113E+00 | 1.4239E+01 | -4.5196E+01 | 5.9416E+01 | 2.3048E+01 | -1.1793E+02 | 7.6403E+01 |
| S7 | -2.1286E+00 | 1.4956E+01 | -5.9598E+01 | 1.3375E+02 | -1.6367E+02 | 8.9599E+01 | 1.3380E+00 |
| S8 | -7.5840E-02 | 4.9683E-01 | -1.7375E-01 | -6.0831E+00 | 2.3009E+01 | -3.3952E+01 | 1.8892E+01 |
Table 14
Table 15 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 5.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.47 | 1.55 | -0.67 | 8.98 | 2.23 |
Table 15
Figure 10 shows the distortion curve of the projection lens of embodiment 5, represents the distortion size in the case of different visual angles
Value.As can be seen from FIG. 10, the projection lens given by embodiment 5 can realize good image quality.
Embodiment 6
The projection lens according to the embodiment of the present application 6 is described referring to Figure 11 to Figure 12.Figure 11 is shown according to this
Apply for the structure diagram of the projection lens of embodiment 6.
As shown in figure 11, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 16 shows surface type, radius of curvature, thickness, material and the circle of each lens of the projection lens of embodiment 6
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 16
As shown in Table 16, in embodiment 6, the image source side table of any one lens in the first lens E1 to the 4th lens E4
Face and image side surfaces are aspherical.Table 17 shows the high order term coefficient available for aspherical mirror each in embodiment 6,
In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 7.7309E-01 | -1.2329E+00 | 1.5965E+00 | 6.2851E+00 | -1.3052E+01 | 0.0000E+00 | 0.0000E+00 |
| S2 | 9.4646E-01 | 5.7194E+00 | -1.0454E+02 | 1.0912E+03 | -5.6163E+03 | 1.2871E+04 | -1.0593E+04 |
| S3 | 8.1481E-01 | 1.6495E+01 | -1.2105E+03 | 2.5863E+04 | -2.9970E+05 | 1.6837E+06 | -3.4325E+06 |
| S4 | 3.9765E+00 | -2.6956E+01 | 2.7356E+02 | -3.5215E+03 | 3.2010E+04 | -1.6161E+05 | 3.4395E+05 |
| S5 | -3.5554E-01 | 2.6437E+00 | -1.5112E+01 | 7.9214E+01 | -2.3434E+02 | 3.5795E+02 | -2.1981E+02 |
| S6 | -2.3670E-02 | -3.0676E+00 | 3.4836E+01 | -1.9511E+02 | 5.7765E+02 | -8.3985E+02 | 4.8062E+02 |
| S7 | -2.8650E-02 | -1.8915E+00 | 1.7194E+01 | -8.4513E+01 | 2.1753E+02 | -2.7457E+02 | 1.3378E+02 |
| S8 | -2.2260E-02 | -1.4160E-02 | -4.6485E-01 | 2.4129E+00 | -6.2830E+00 | 7.6431E+00 | -3.5857E+00 |
Table 17
Table 18 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 6.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.90 | 1.47 | -0.50 | 8.80 | 2.05 |
Table 18
Figure 12 shows the distortion curve of the projection lens of embodiment 6, represents the distortion size in the case of different visual angles
Value.As can be seen from FIG. 12, the projection lens given by embodiment 6 can realize good image quality.
Embodiment 7
The projection lens according to the embodiment of the present application 7 is described referring to Figure 13 to Figure 14.Figure 13 is shown according to this
Apply for the structure diagram of the projection lens of embodiment 7.
As shown in figure 13, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is concave surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 19 shows surface type, radius of curvature, thickness, material and the circle of each lens of the projection lens of embodiment 7
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 19
As shown in Table 19, in embodiment 7, the image source side table of any one lens in the first lens E1 to the 4th lens E4
Face and image side surfaces are aspherical.Table 20 shows the high order term coefficient available for aspherical mirror each in embodiment 7,
In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 4.8361E-01 | -3.2341E-01 | 2.6070E-01 | -3.1058E-01 | -9.5350E-02 | 0.0000E+00 | 0.0000E+00 |
| S2 | 4.5980E-01 | 4.4671E+00 | -4.1977E+01 | 2.5620E+02 | -1.0182E+03 | 2.0564E+03 | -1.5903E+03 |
| S3 | -1.9670E-01 | 1.0073E+01 | -6.5709E+02 | 1.4866E+04 | -1.9436E+05 | 1.3028E+06 | -3.4935E+06 |
| S4 | 2.4263E+00 | -4.4909E+00 | -1.3788E+02 | 3.0152E+03 | -3.0798E+04 | 1.5720E+05 | -3.1835E+05 |
| S5 | -5.6710E-01 | 4.6274E+00 | -3.0735E+01 | 1.7618E+02 | -6.1353E+02 | 1.1174E+03 | -8.1790E+02 |
| S6 | 1.8892E-01 | -1.0114E+00 | 1.0131E+01 | -5.1681E+01 | 1.5016E+02 | -2.2435E+02 | 1.3825E+02 |
| S7 | 1.2243E-01 | -1.3146E+00 | 9.3104E+00 | -4.0508E+01 | 9.3836E+01 | -1.0927E+02 | 5.0130E+01 |
| S8 | -5.0800E-03 | -1.0316E-01 | 2.0290E-01 | 1.4868E-01 | -2.2665E+00 | 3.9620E+00 | -2.2084E+00 |
Table 20
Table 21 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 7.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.50 | 1.71 | -0.68 | 11.51 | 2.00 |
Table 21
Figure 14 shows the distortion curve of the projection lens of embodiment 7, represents the distortion size in the case of different visual angles
Value.As can be seen from FIG. 14, the projection lens given by embodiment 7 can realize good image quality.
Embodiment 8
The projection lens according to the embodiment of the present application 8 is described referring to Figure 15 to Figure 16.Figure 15 is shown according to this
Apply for the structure diagram of the projection lens of embodiment 8.
As shown in figure 15, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is convex surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 22 shows surface type, radius of curvature, thickness, material and the circle of each lens of the projection lens of embodiment 8
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 22
As shown in Table 22, in embodiment 8, the image source side table of any one lens in the first lens E1 to the 4th lens E4
Face and image side surfaces are aspherical.Table 23 shows the high order term coefficient available for aspherical mirror each in embodiment 8,
In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 2.0451E-01 | -7.6718E-01 | 1.3377E-01 | 3.0263E+00 | -7.9566E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 3.9981E-01 | -1.2211E+00 | 4.9526E+00 | -1.7683E+01 | 3.8928E+00 | 5.0109E+01 | -4.2296E+01 |
| S3 | 1.3489E-01 | -7.5732E+00 | 5.2784E+01 | -8.8773E+02 | 9.8831E+03 | -6.1758E+04 | 1.6268E+05 |
| S4 | 3.0761E+00 | -2.1121E+01 | 2.3813E+02 | -2.9466E+03 | 2.6793E+04 | -1.3781E+05 | 2.9792E+05 |
| S5 | -6.1013E-01 | 4.1908E+00 | -1.7786E+01 | 5.3101E+01 | -8.4057E+01 | 3.3219E+01 | 4.2226E+01 |
| S6 | -4.0151E-01 | 2.4365E-01 | 1.8245E+01 | -1.1416E+02 | 3.3874E+02 | -4.9319E+02 | 2.8408E+02 |
| S7 | -3.4922E-01 | -1.1731E-01 | 1.0731E+01 | -5.9213E+01 | 1.5296E+02 | -1.9217E+02 | 9.2682E+01 |
| S8 | -5.8220E-02 | -2.9410E-02 | -8.0880E-02 | 1.1590E+00 | -4.7132E+00 | 7.4302E+00 | -4.3784E+00 |
Table 23
Table 24 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 8.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.00 | 1.43 | -0.74 | 12.16 | 2.24 |
Table 24
Figure 16 shows the distortion curve of the projection lens of embodiment 8, represents the distortion size in the case of different visual angles
Value.As can be seen from FIG. 16, the projection lens given by embodiment 8 can realize good image quality.
Embodiment 9
The projection lens according to the embodiment of the present application 9 is described referring to Figure 17 to Figure 18.Figure 17 shows according to this
Apply for the structure diagram of the projection lens of embodiment 8.
As shown in figure 17, according to the projection lens of the application illustrative embodiments along optical axis by image source side into image side according to
Sequence includes：First lens E1, the second lens E2, third lens E3, the 4th lens E4 and diaphragm STO.
First lens E1 has positive light coke, and image source side surface S1 is convex surface, and image side surfaces S2 is convex surface；Second thoroughly
Mirror E2 has negative power, and image source side surface S3 is concave surface, and image side surfaces S4 is concave surface；Third lens E3 has positive light focus
Degree, image source side surface S5 are concave surface, and image side surfaces S6 is convex surface；4th lens E4 has positive light coke, image source side table
Face S7 is concave surface, and image side surfaces S8 is convex surface.In about 800nm to about 1000nm light-wave bands, the light of the projection lens
Transmitance is more than 85%.Light from image source sequentially passes through each surface S1 to S8 and is ultimately imaged projection in such as projection screen
(not shown) on face.
Table 25 shows surface type, radius of curvature, thickness, material and the circle of each lens of the projection lens of embodiment 9
Coefficient is bored, wherein, the unit of radius of curvature and thickness is millimeter (mm).
Table 25
As shown in Table 25, in embodiment 9, the image source side table of any one lens in the first lens E1 to the 4th lens E4
Face and image side surfaces are aspherical.Table 26 shows the high order term coefficient available for aspherical mirror each in embodiment 9,
In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 3.6323E-01 | -9.6699E-01 | 1.9994E-01 | 2.8178E+00 | -7.4025E+00 | 0.0000E+00 | 0.0000E+00 |
| S2 | 4.4282E-01 | -1.3810E-01 | -4.5518E+00 | 2.8758E+01 | -1.2061E+02 | 2.1459E+02 | -1.2413E+02 |
| S3 | 3.3197E-01 | -9.9161E+00 | 1.0597E+02 | -1.7647E+03 | 1.8742E+04 | -1.1157E+05 | 2.8453E+05 |
| S4 | 3.0244E+00 | -1.9525E+01 | 2.1702E+02 | -2.7327E+03 | 2.5851E+04 | -1.3854E+05 | 3.1237E+05 |
| S5 | -9.2369E-01 | 7.0146E+00 | -3.5276E+01 | 1.2828E+02 | -2.9140E+02 | 3.6266E+02 | -1.7435E+02 |
| S6 | -3.6876E-01 | -7.5200E-03 | 2.3023E+01 | -1.4295E+02 | 4.3183E+02 | -6.6276E+02 | 4.1416E+02 |
| S7 | -3.3232E-01 | -1.4068E-01 | 1.2417E+01 | -7.2617E+01 | 2.0287E+02 | -2.8620E+02 | 1.6007E+02 |
| S8 | -4.6560E-02 | -3.6610E-02 | -1.1030E-02 | 6.6582E-01 | -3.3885E+00 | 6.1323E+00 | -4.2951E+00 |
Table 26
Table 27 provides total effective focal length f of the projection lens and effective focal length f1 to f4 of each lens in embodiment 9.
| Parameter | f(mm) | f1(mm) | f2(mm) | f3(mm) | f4(mm) |
| Numerical value | 4.25 | 1.61 | -0.74 | 22.92 | 2.04 |
Table 27
Figure 18 shows the distortion curve of the projection lens of embodiment 9, represents the distortion size in the case of different visual angles
Value.As can be seen from FIG. 18, the projection lens given by embodiment 9 can realize good image quality.
To sum up, embodiment 1 to embodiment 9 meets the relationship shown in table 28 respectively.
Table 28
The preferred embodiment and the explanation to institute's application technology principle that above description is only the application.People in the art
Member should be appreciated that invention scope involved in the application, however it is not limited to the technology that the specific combination of above-mentioned technical characteristic forms
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
The other technical solutions for arbitrarily combining and being formed.Such as features described above has similar work(with (but not limited to) disclosed herein
The technical solution that the technical characteristic of energy is replaced mutually and formed.
Claims (23)
1. projection lens, which is characterized in that the projection lens is extremely sequentially included along optical axis by image source side into image side：
The first lens with positive light coke；
The second lens with negative power, image source side surface and image side surfaces are concave surface；
Third lens with positive light coke or negative power；
The 4th lens with positive light coke, image side surfaces are convex surface；
Total effective focal length f of the projection lens meets 2.0 ＜ f/f1 ＜ 3.5 with the effective focal length f1 of first lens.
2. projection lens according to claim 1, which is characterized in that the 4th lens are thick in the center on the optical axis
It spends CT4 and meets 1.5 ＜ CT4/CT2 ＜ 3.0 in the center thickness CT2 on the optical axis with second lens.
3. projection lens according to claim 1, which is characterized in that first lens and second lens are described
The spacing distance T12 and spacing distance T23 of second lens and the third lens on the optical axis on optical axis meets
0.8 ＜ T12/T23 ＜ 2.2.
4. projection lens according to claim 1, which is characterized in that the curvature of the image side surfaces of the 4th lens half
Diameter R8 and the radius of curvature R 1 of the image source side surface of first lens meet -1.5≤R8/R1≤- 1.0.
5. projection lens according to claim 1, which is characterized in that the curvature of the image side surfaces of second lens half
Diameter R4 and the radius of curvature R 3 of the image source side surface of second lens meet -2.4 ＜ R4/R3 ＜ -0.8.
6. projection lens according to claim 1, which is characterized in that total effective focal length f of the projection lens with it is described
The effective focal length f2 of second lens meets f/f2≤- 4.0.
7. projection lens according to claim 4, which is characterized in that total effective focal length f of the projection lens with it is described
The effective focal length f4 of 4th lens meets 1.5 ＜ f/f4 ＜ 2.5.
8. projection lens according to claim 1, which is characterized in that the third lens have positive light coke.
9. projection lens according to claim 8, which is characterized in that the effective focal length f3 of the third lens and the throwing
Total effective focal length f of shadow camera lens meets 1.0 ＜ f3/f ＜ 5.5.
10. projection lens according to claim 1, which is characterized in that the maximum of the image side surfaces of the 4th lens
Effective half bore DT42 and the effective half bore DT41 of maximum of the image source side surface of the 4th lens meet 1.0 ＜ DT42/
DT41 ＜ 1.4.
11. projection lens according to any one of claim 1 to 10, which is characterized in that in the light of 800nm to 1000nm
In wave wave band, the light penetration of the projection lens is more than 85%.
12. projection lens according to any one of claim 1 to 10, which is characterized in that the image source of the projection lens
Face to distance TTL of the image side surfaces on the optical axis and the projection lens of the 4th lens total effective focal length f
Meet TTL/f ＜ 1.0.
13. projection lens, which is characterized in that the projection lens is extremely sequentially included along optical axis by image source side into image side：
The first lens with positive light coke；
The second lens with negative power, image source side surface and image side surfaces are concave surface；
Third lens with positive light coke or negative power；
The 4th lens with positive light coke, image side surfaces are convex surface；
Total effective focal length f of the projection lens meets 1.5 ＜ f/f4 ＜ 2.5 with the effective focal length f4 of the 4th lens.
14. projection lens according to claim 13, which is characterized in that total effective focal length f of the projection lens and institute
The effective focal length f1 for stating the first lens meets 2.0 ＜ f/f1 ＜ 3.5.
15. projection lens according to claim 13, which is characterized in that total effective focal length f of the projection lens and institute
The effective focal length f2 for stating the second lens meets f/f2≤- 4.0.
16. projection lens according to claim 13, which is characterized in that the third lens have positive light coke, have
It imitates focal length f3 and total effective focal length f of the projection lens meets 1.0 ＜ f3/f ＜ 5.5.
17. the projection lens according to any one of claim 13 to 16, which is characterized in that in 800nm to 1000nm's
In light-wave band, the light penetration of the projection lens is more than 85%.
18. the projection lens according to any one of claim 13 to 16, which is characterized in that the image source of the projection lens
Face to distance TTL of the image side surfaces on the optical axis and the projection lens of the 4th lens total effective focal length f
Meet TTL/f ＜ 1.0.
19. the projection lens according to any one of claim 13 to 16, which is characterized in that the imaging of the 4th lens
The effective half bore DT42 of maximum of side surface meets with the effective half bore DT41 of maximum of the image source side surface of the 4th lens
1.0 ＜ DT42/DT41 ＜ 1.4.
20. the projection lens according to any one of claim 13 to 16, which is characterized in that first lens and described
Between spacing distance T12 and second lens and the third lens of second lens on the optical axis are on the optical axis
Gauge meets 0.8 ＜ T12/T23 ＜ 2.2 from T23.
21. the projection lens according to any one of claim 13 to 16, which is characterized in that the 4th lens are in described
Center thickness CT4 on optical axis meets 1.5 ＜ CT4/CT2 ＜ with second lens in the center thickness CT2 on the optical axis
3.0。
22. projection lens according to claim 21, which is characterized in that the curvature of the image side surfaces of the 4th lens
Radius R8 and the radius of curvature R 1 of the image source side surface of first lens meet -1.5≤R8/R1≤- 1.0.
23. projection lens according to claim 21, which is characterized in that the curvature of the image side surfaces of second lens
Radius R4 and the radius of curvature R 3 of the image source side surface of second lens meet -2.4 ＜ R4/R3 ＜ -0.8.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721754652.XU CN207516711U (en) | 2017-12-15 | 2017-12-15 | Projection lens |
| PCT/CN2018/092207 WO2019114232A1 (en) | 2017-12-15 | 2018-06-21 | Projection lens |
| US16/273,855 US10969565B2 (en) | 2017-12-15 | 2019-02-12 | Projection lens assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721754652.XU CN207516711U (en) | 2017-12-15 | 2017-12-15 | Projection lens |
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| Publication Number | Publication Date |
|---|---|
| CN207516711U true CN207516711U (en) | 2018-06-19 |
Family
ID=62544144
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721754652.XU Active CN207516711U (en) | 2017-12-15 | 2017-12-15 | Projection lens |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831630A (en) * | 2017-12-15 | 2018-03-23 | 浙江舜宇光学有限公司 | Projection lens |
| WO2019114232A1 (en) * | 2017-12-15 | 2019-06-20 | 浙江舜宇光学有限公司 | Projection lens |
| CN110908071A (en) * | 2018-09-14 | 2020-03-24 | 三星电机株式会社 | Optical imaging system |
| CN111936907A (en) * | 2019-09-04 | 2020-11-13 | 深圳市海谱纳米光学科技有限公司 | Optical lens and optical equipment |
| TWI742822B (en) * | 2020-08-27 | 2021-10-11 | 新鉅科技股份有限公司 | Four-piece infrared projection lens system |
| US11733486B2 (en) | 2018-09-14 | 2023-08-22 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system including first to fourth lenses |
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2017
- 2017-12-15 CN CN201721754652.XU patent/CN207516711U/en active Active
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107831630A (en) * | 2017-12-15 | 2018-03-23 | 浙江舜宇光学有限公司 | Projection lens |
| WO2019114232A1 (en) * | 2017-12-15 | 2019-06-20 | 浙江舜宇光学有限公司 | Projection lens |
| CN107831630B (en) * | 2017-12-15 | 2023-12-29 | 浙江舜宇光学有限公司 | Projection lens |
| CN110908071A (en) * | 2018-09-14 | 2020-03-24 | 三星电机株式会社 | Optical imaging system |
| US11415776B2 (en) | 2018-09-14 | 2022-08-16 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system |
| CN110908071B (en) * | 2018-09-14 | 2022-10-18 | 三星电机株式会社 | Optical imaging system |
| US11733486B2 (en) | 2018-09-14 | 2023-08-22 | Samsung Electro-Mechanics Co., Ltd. | Optical imaging system including first to fourth lenses |
| CN111936907A (en) * | 2019-09-04 | 2020-11-13 | 深圳市海谱纳米光学科技有限公司 | Optical lens and optical equipment |
| CN111936907B (en) * | 2019-09-04 | 2021-11-23 | 深圳市海谱纳米光学科技有限公司 | Optical lens and optical equipment |
| TWI742822B (en) * | 2020-08-27 | 2021-10-11 | 新鉅科技股份有限公司 | Four-piece infrared projection lens system |
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