CN207281378U - Projection lens - Google Patents
Projection lens Download PDFInfo
- Publication number
- CN207281378U CN207281378U CN201721190865.4U CN201721190865U CN207281378U CN 207281378 U CN207281378 U CN 207281378U CN 201721190865 U CN201721190865 U CN 201721190865U CN 207281378 U CN207281378 U CN 207281378U
- Authority
- CN
- China
- Prior art keywords
- lens
- projection lens
- projection
- focal length
- utility
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Abstract
The utility model discloses a kind of projection lens, the projection lens includes successively from the object side to image side along optical axis：The first lens with positive light coke, its thing side surface are convex surface；The second lens with positive light coke, its image side surface are convex surface；Diaphragm；The optical centre of each lens is located along the same line；The projection lens meets the following conditions：f1>f2；(dn/dt)1<‑50×10‑6/℃；(dn/dt)2>‑10×10‑6/℃；Wherein, f1 represents the focal length of first lens, and f2 represents the focal length of second lens, and (dn/dt) 1, (dn/dt) 2 represent the refractive index variation with temperature rate of first lens, second lens respectively.The projection lens, can be with eyeglass in itself and the influence of thermal expansion focusing that brings of structural member is cancelled out each other since the refractive index variation with temperature rate distribution of each eyeglass is reasonable, and institute is so as to realize focal length stabilization and suitable for different temperature occasions.
Description
Technical field
Pick-up lens technical field is the utility model is related to, more particularly to a kind of projection lens.
Background technology
With the fast development of smart mobile phone, the camera function of mobile phone also continues to bring out out the technology of innovation, such as apple
The 3D imaging technique that company promotes mainly, this optical sensing techniques based on 3D structure lights, recognize available for face, gesture, strengthen
Camera function, brings AR new opplications, and optical imagery is changed from past two dimension to three dimensions, thus bring it is more true,
Clearly sensory experience.
3D structure lights refer to after specific laser intelligence is projected body surface, are gathered by camera, are made according to object
Into the information such as position and depth of the change to calculate object of optical information, and then restore whole three dimensions.Specific laser
Information is a very important index in 3D structured light techniques, therefore to laser intelligence is projected to testee surface
Projection lens requires very high.It is this to there is specific solid angle to launch VCSEL (vertical cavity surface emitting laser) facet surface
Array point light source project to the projection lens on testee surface, be a key link of 3D image quality.
In existing projection lens class product, exist as the change of use environment temperature, lens focus f occur larger
The problem of change, this can cause the angle of camera lens projection light that significant change occurs, change original optical information, so as to cause whole
There is error in the calculating of system, influences the profile recovery accuracy of three-dimensional body；Equally also exist with the change of environment temperature, throw
The problem of picture point of shadow becomes larger, this clarity for also resulting in system reducing three-dimensional body decline.
Utility model content
The utility model is intended at least solve one of technical problem existing in the prior art.For this reason, the utility model
Purpose is to propose a kind of projection lens that can be realized focal length under different temperature occasions and stablize.
According to projection lens provided by the utility model, include successively from the object side to image side along optical axis：
The first lens with positive light coke, its thing side surface are convex surface；
The second lens with positive light coke, its image side surface are convex surface；
Diaphragm；Diaphragm be arranged on the second lens after, can effective limiting aperture, easy to optical design；
The optical centre of each lens is located along the same line；
The projection lens meets the following conditions：
f1>f2；
(dn/dt)1<-50×10-6/℃；
(dn/dt)2>-10×10-6/℃；
Wherein, f1 represents the focal length of first lens, and f2 represents the focal length of second lens, (dn/dt) 1, (dn/
Dt) the 2 refractive index variation with temperature rate for representing first lens, second lens respectively.
The projection lens of the utility model since the refractive index variation with temperature rate distribution of each eyeglass is reasonable, can and mirror
Piece is in itself and the influence of thermal expansion focusing that brings of structural member is cancelled out each other, and is protected so as to fulfill focal length under different temperature occasions
It is fixed to keep steady, and suitable for different temperature occasions, which can make the angle of camera lens projection light that significant change not occur, no
Change original optical information.
Further, the projection lens meets conditional：
0 ＜ f1/f2 ＜ 3.5；
Wherein, f1 represents the focal length of first lens, and f2 represents the focal length of second lens.
Further, the projection lens meets conditional：
- 5 ＜ f/r4 ＜ 0；
Wherein, f represents the system focal length of the projection lens, and r4 represents the curvature half on the second lens image side surface
Footpath.
Further, the projection lens meets conditional：
- 2.5 ＜ r1/r4 ＜ 0；
Wherein, r1 represents the radius of curvature of the first lens thing side surface, and r4 represents the second lens image side surface
Radius of curvature.
Further, the projection lens meets conditional：
0.5 ＜ CT2/CT1 ＜ 3.5；
Wherein, CT2 represents the center thickness of second lens, and CT1 represents the center thickness of first lens.
Further, each thing side surface and image side surface of first lens and second lens are aspherical.
Further, first lens are plastic cement material, and second lens are glass material.
Further, there is airspace between first lens and second lens.
Further, first lens and second lens are unbonded separate lenses.
Further, the aspherical surface shape of each lens is satisfied by following equations in the projection lens：
Wherein, z represents that curved surface leaves distance of the curved surface vertex in optical axis direction, and c represents the curvature on curved surface vertex, and K is represented
Quadratic surface coefficient, h represent optical axis to the distance of curved surface, and B, C, D, E and F represent quadravalence, six ranks, eight ranks, ten ranks and ten respectively
Surface of second order coefficient.
The advantages of the utility model, will be set forth in part in the description, and partly will become bright from the following description
It is aobvious, or recognized by the practice of the utility model.
Brief description of the drawings
The above-mentioned and/or additional aspect and advantage of the utility model will in the description from combination accompanying drawings below to embodiment
Become obvious and be readily appreciated that, wherein：
Fig. 1 is the cross section structure schematic diagram according to the projection lens of one embodiment of the utility model；
Fig. 2 a are that the curvature of field of the projection lens at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 1 is bent
Line chart, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Fig. 2 b are that distortion of the projection lens at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 1 is bent
Line chart, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Fig. 3 is projection lens in the utility model embodiment 1 at 40 DEG C, picture point size when 300mm image distances are imaged
And the schematic diagram of shape, unit are micron；
Fig. 4 is the cross section structure schematic diagram of the projection lens in the utility model embodiment 2；
Fig. 5 a are that the curvature of field of the projection lens at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 2 is bent
Line chart, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Fig. 5 b are that distortion of the projection lens at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 2 is bent
Line chart, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Fig. 6 is projection lens in the utility model embodiment 2 at 40 DEG C, picture point size when 300mm image distances are imaged
And the schematic diagram of shape, unit are micron；
Fig. 7 is the cross section structure schematic diagram of the projection lens in the utility model embodiment 3；
Fig. 8 a are that the curvature of field of the projection lens at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 3 is bent
Line chart, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Fig. 8 b are that distortion of the projection lens at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 3 is bent
Line chart, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Fig. 9 is projection lens in the utility model embodiment 3 at 40 DEG C, picture point size when 300mm image distances are imaged
And the schematic diagram of shape, unit are micron；
Figure 10 is the cross section structure schematic diagram of the projection lens in the utility model embodiment 4；
Figure 11 a are the curvature of field of the projection lens at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 4
Curve map, x-axis is curvature of field value in figure, and coordinate unit is millimeter, and y-axis is the visual field with the high definition of thing；
Figure 11 b are distortion of the projection lens at 40 DEG C, the imaging of 300mm image distances in the utility model embodiment 4
Curve map, x-axis is distortion value in figure, and coordinate unit is percentage, and y-axis is the visual field with the high definition of thing；
Figure 12 is projection lens in the utility model embodiment 4 at 40 DEG C, picture point size when 300mm image distances are imaged
And the schematic diagram of shape, unit are micron.
Embodiment
To enable the purpose of this utility model, feature and advantage more obvious understandable, below in conjunction with the accompanying drawings to this practicality
New embodiment is described in detail.Some embodiments of the utility model are given in attached drawing.But this practicality
It is new to realize in many different forms, however it is not limited to embodiment described herein.On the contrary, provide these implementations
The purpose of example is the disclosure more thorough and comprehensive made to the utility model.
Unless otherwise defined, all of technologies and scientific terms used here by the article is led with belonging to the technology of the utility model
The normally understood implication of technical staff in domain is identical.It is simply in the term used in the description of the utility model herein
The purpose of description specific embodiment, it is not intended that in limitation the utility model.Term as used herein " and/or " include
The arbitrary and all combination of one or more relevant Listed Items.
Referring to Fig. 1, the projection lens that an embodiment of the utility model provides, along optical axis from the object side to image side successively
Including：
The first lens L1 with positive light coke, its thing side surface are convex surface；
The second lens L2 with positive light coke, its image side surface are convex surface；
Diaphragm S5；Diaphragm S5 be arranged on the second lens L2 after, can effective limiting aperture, easy to optical design；
The optical centre of each lens is located along the same line；
The projection lens meets the following conditions：
f1>f2；
(dn/dt)1<-50×10-6/℃；
(dn/dt)2>-10×10-6/℃；
Wherein, the focal length of f1 expressions the first lens L1, the focal length of f2 expressions the second lens L2, (dn/dt) 1,
(dn/dt) 2 the first lens L2, the refractive index variation with temperature rate of the second saturating L2 are represented respectively.
The difference of the focal length f2 of the focal length f1 of the first lens L1 and the second lens L2 is more than 0, that is, meets condition
f1>f2.It is weaker to the converging power of light compared with the second lens L2 that this condition limits the first lens L1.
The refractive index variation with temperature rate (dn/dt) 1 and (dn/dt) 2 of the first lens L1 and the second lens L2 is full
Sufficient condition (dn/dt) 1<-50×10-6/ DEG C, (dn/dt) 2>-10×10-6/℃.This condition limits the refractive index of two lens
Variation with temperature rate, is mainly used for the thermal expansion of reasonably combined eyeglass, ensures the stability of lens focus at different temperatures.
Above-mentioned projection lens since the refractive index variation with temperature rate distribution of each eyeglass is reasonable, can with eyeglass in itself and
The influence for the thermal expansion focusing that structural member is brought is cancelled out each other, and keeps stablizing so as to fulfill focal length under different temperature occasions,
Suitable for different temperature occasions, which can make the angle of camera lens projection light that significant change not occur, not change original
Some optical informations.
Specifically, in the projection lens, the first lens L1 has positive light coke, its thing side surface S1 is convex surface,
Its thing side surface S1 and image side surface S2 is all aspherical, converges the telecentric beam from laser whereby, and collocation first is saturating
Mirror provides enough positive light cokes, can efficiently control the overall volume of optical lens group.
The second lens L2 has negative power, its image side surface S4 is convex surface, its thing side surface S3 and image side surface
S4 is all aspherical, can effectively correct the aberration of optical lens, and efficiently control shooting angle.
Each the thing side surface and image side surface of the first lens L1 and the second lens L2 is all aspherical, by each lens
Two surfaces be fabricated to shape beyond sphere, more controlled variable can be obtained whereby, to cut down aberration.
In above-mentioned projection lens, using the unbonded separate lenses of two panels, in other words, the first lens L1 and the second lens L2
Between there is an airspace, since the more non-adhering lens of the technique of cemented lens are complicated, the special adhesive surface palpus in two lens
Possess the curved surface of high accuracy, to reach the high adaptation during bonding of two lens, and in adhesion process, can also because of off normal and
Cause adaptation bad, image optics image quality.And in the projection lens of present embodiment, it is unbonded solely using two panels
The problem that founding lens, cemented lens can be effectively improved.
In optical lens group provided by the utility model, the first lens L1 can be plastic cement material, so as to effectively reducing life
Produce cost；Second lens L2 can be glass material, to ensure that, when operating temperature changes, system resolving power does not occur substantially
Change.
Further, the projection lens meets conditional：
0 ＜ f1/f2 ＜ 3.5；
Wherein, f1 represents the focal length of the first lens L1, and f2 represents the focal length of the second lens L2.This condition limits
The proportioning of the first lens L1 and the second lens L2 focal lengths, be mainly used for by by the convergence of rays of the first lens L1 in into
In image planes, while reduce the aberration of the projection lens.
Further, the projection lens meets conditional：
- 5 ＜ f/r4 ＜ 0；
Wherein, f represents the system focal length of the projection lens, and r4 represents the curvature of the second lens L2 image sides surface S4
Radius.
Further, the projection lens meets conditional：
- 2.5 ＜ r1/r4 ＜ 0；
Wherein, r1 represents the radius of curvature of the first lens L1 things side surface S1, and r4 represents the second lens L2 pictures
The radius of curvature of side surface S4.This condition limits the first lens L1 things side surface S1 and the second lens L2 image sides surface S4
Direction on the contrary, being mainly used on imaging surface, while the projection being reduced by the convergence of rays of the first lens L1
The aberration of camera lens.
Further, the projection lens meets conditional：
0.5 ＜ CT2/CT1 ＜ 3.5；
Wherein, CT2 represents the center thickness of the second lens L2, and CT1 represents the center thickness of the first lens L1.
This condition limits the proportioning of the center thickness of the second lens L2 and the center thickness of the first lens L1, by appropriately configured
The center thickness of lens, is conducive to the processing and manufacturing and assembling of optical lens group.
Divide multiple embodiments that the utility model is further detailed below.In following each embodiment, projection
The thickness of each lens in camera lens, radius of curvature are different, the specific different parameter lists that can be found in each embodiment.It is following
Embodiment is only the better embodiment of the utility model, but the embodiment of the utility model is not merely by following embodiments
Limitation, the other any change made without departing from the utility model innovative point, replacement, combination or simplification, are regarded as
The substitute mode of effect, is included within the scope of protection of the utility model.
In all embodiments of the utility model, f represents the effective focal length of the projection lens, and NA represents numerical aperture
Footpath, r represent the radius of curvature on optical surface vertex, and d represents optical surface spacing (between two adjacent optical surface vertex
Distance), ndRepresent the refractive index of each lens, Vd represents the Abbe number of each lens, can be used to weigh the light dispersion of medium
Degree, TTL represent the optics overall length of the projection lens.
The aspherical surface shape of each lens in each embodiment of the utility model is satisfied by following equations：
Wherein, z represents that curved surface leaves distance of the curved surface vertex in optical axis direction, and c represents the curvature on curved surface vertex, and K is represented
Quadratic surface coefficient, h represent optical axis to the distance of curved surface, and B, C, D, E and F represent quadravalence, six ranks, eight ranks, ten ranks and ten respectively
Surface of second order coefficient.
Embodiment 1：
The structure chart of the projection lens of the present embodiment see Fig. 1, while refer to Fig. 2 a, 2b and Fig. 3, the projection lens
The relevant parameter of each eyeglass is as shown in table 1-1 in head.
Table 1-1
The aspherical parameter of each lens of the present embodiment is as shown in table 1-2.
Table 1-2
Embodiment 2
Fig. 4, Fig. 5 a, 5b and Fig. 6 are referred to, for the projection lens provided in utility model second embodiment, the projection
The relevant parameter of each eyeglass is as shown in table 2-1 in camera lens.
Table 2-1
The aspherical parameter of each lens of the present embodiment is as shown in table 2-2.
Table 2-3
Embodiment 3
Fig. 7, Fig. 8 a, 8b and Fig. 9 are referred to, for the projection lens provided in utility model 3rd embodiment, the projection
The relevant parameter of each eyeglass is as shown in table 3-1 in camera lens.
Table 3-1
The aspherical parameter of each lens of the present embodiment is as shown in table 3-2.
Table 3-4
Embodiment 4
0, Figure 11 a, 11b and Figure 12 are please referred to Fig.1, is the projection lens provided in utility model fourth embodiment, it is described
The relevant parameter of each eyeglass is as shown in table 4-1 in projection lens.
Table 4-1
The aspherical parameter of each lens of the present embodiment is as shown in table 4-2.
Table 4-5
Since the data area of picture point is smaller, represent that lens performance is better, can be drawn from the attached drawing in each embodiment,
Picture point RMS radius in each embodiment are at 40 DEG C, and scope illustrates each implementation within 80um when 300mm image distances are imaged
Aberration in example is corrected well.
Table 5 is above-mentioned 4 embodiments and its corresponding optical characteristics, including system focal length f, numerical aperture NA and system are total
Long TTL, and numerical value corresponding with above each conditional.
Table 5
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means specific features, structure, material or the spy for combining the embodiment or example description
Point is contained at least one embodiment or example of the utility model.In the present specification, to the schematic table of above-mentioned term
State and may not refer to the same embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be
Combined in an appropriate manner in any one or more embodiments or example.
Embodiment described above only expresses the several embodiments of the utility model, its description is more specific and detailed,
But it should not be interpreted as limiting the scope of the present invention.It should be pointed out that for the common of this area
For technical staff, without departing from the concept of the premise utility, various modifications and improvements can be made, these all belong to
In the scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (10)
1. a kind of projection lens, it is characterised in that include successively from the object side to image side along optical axis：
The first lens with positive light coke, its thing side surface are convex surface；
The second lens with positive light coke, its image side surface are convex surface；
Diaphragm；
The optical centre of each lens is located along the same line；
The projection lens meets the following conditions：
f1>f2；
(dn/dt)1<-50×10-6/℃；
(dn/dt)2>-10×10-6/℃；
Wherein, f1 represents the focal length of first lens, and f2 represents the focal length of second lens, (dn/dt) 1, (dn/dt) 2
The refractive index variation with temperature rate of first lens, second lens is represented respectively.
2. projection lens according to claim 1, it is characterised in that the projection lens meets conditional：
0 ＜ f1/f2 ＜ 3.5；
Wherein, f1 represents the focal length of first lens, and f2 represents the focal length of second lens.
3. projection lens according to claim 1, it is characterised in that the projection lens meets conditional：
- 5 ＜ f/r4 ＜ 0；
Wherein, f represents the system focal length of the projection lens, and r4 represents the radius of curvature on the second lens image side surface.
4. projection lens according to claim 1, it is characterised in that the projection lens meets conditional：
- 2.5 ＜ r1/r4 ＜ 0；
Wherein, r1 represents the radius of curvature of the first lens thing side surface, and r4 represents the song on the second lens image side surface
Rate radius.
5. projection lens according to claim 1, it is characterised in that the projection lens meets conditional：
0.5 ＜ CT2/CT1 ＜ 3.5；
Wherein, CT2 represents the center thickness of second lens, and CT1 represents the center thickness of first lens.
6. according to the projection lens described in claim 1 to 5 any one, it is characterised in that first lens and described
Each thing side surface and the image side surface of two lens are aspherical.
7. according to the projection lens described in claim 1 to 5 any one, it is characterised in that first lens are plastic cement material
Matter, second lens are glass material.
8. projection lens according to claim 1, it is characterised in that have between first lens and second lens
There is airspace.
9. projection lens according to claim 1, it is characterised in that first lens and second lens are non-stick
The separate lenses of conjunction.
10. projection lens according to claim 6, it is characterised in that the aspherical table of each lens in the projection lens
Face shape is satisfied by following equations：
Wherein, z represents that curved surface leaves distance of the curved surface vertex in optical axis direction, and c represents the curvature on curved surface vertex, and K represents secondary
Surface coefficients, h represent optical axis to the distance of curved surface, and B, C, D, E and F represent quadravalence, six ranks, eight ranks, ten ranks and ten second orders respectively
Surface coefficients.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721190865.4U CN207281378U (en) | 2017-09-15 | 2017-09-15 | Projection lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721190865.4U CN207281378U (en) | 2017-09-15 | 2017-09-15 | Projection lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207281378U true CN207281378U (en) | 2018-04-27 |
Family
ID=61981612
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721190865.4U Withdrawn - After Issue CN207281378U (en) | 2017-09-15 | 2017-09-15 | Projection lens |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN207281378U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436484A (en) * | 2017-09-15 | 2017-12-05 | 江西联创电子有限公司 | Projection lens |
-
2017
- 2017-09-15 CN CN201721190865.4U patent/CN207281378U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107436484A (en) * | 2017-09-15 | 2017-12-05 | 江西联创电子有限公司 | Projection lens |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107505689B (en) | Projection lens system | |
| CN107436484A (en) | Projection lens | |
| CN207301461U (en) | Projection lens system | |
| US11314062B2 (en) | Collimating lens, projecting module and mobile phone | |
| CN108227149A (en) | Collimate camera lens | |
| CN110646918B (en) | Projection lens | |
| CN108318996A (en) | Collimate camera lens | |
| CN109814229A (en) | Optical imaging system | |
| CN105190395B (en) | Projection-type image display device | |
| CN109031591A (en) | Projection lens | |
| CN109031593A (en) | Projection lens | |
| CN110068909B (en) | Four-piece infrared wavelength projection lens set | |
| CN208092311U (en) | Collimate camera lens | |
| CN108107566A (en) | Eyepiece optical system | |
| CN105676430A (en) | Star sensor optical imaging system | |
| CN107966798A (en) | Short focus projection objective | |
| CN207281378U (en) | Projection lens | |
| CN207799220U (en) | Short focus projection objective | |
| CN109782421B (en) | Three-piece infrared single-wavelength projection lens set | |
| CN208013518U (en) | Collimate camera lens | |
| CN111638586A (en) | Glass-plastic mixed infrared confocal lens | |
| CN111273430B (en) | Three-piece infrared wavelength projection lens set | |
| CN212321962U (en) | Glass-plastic mixed infrared confocal lens | |
| TW202115455A (en) | Optical lens and fabrication method thereof | |
| CN111273431B (en) | Three-piece infrared wavelength projection lens set |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180427 Effective date of abandoning: 20230414 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20180427 Effective date of abandoning: 20230414 |