CN110412715A - Camera lens and its manufacturing method - Google Patents
Camera lens and its manufacturing method Download PDFInfo
- Publication number
- CN110412715A CN110412715A CN201810386754.3A CN201810386754A CN110412715A CN 110412715 A CN110412715 A CN 110412715A CN 201810386754 A CN201810386754 A CN 201810386754A CN 110412715 A CN110412715 A CN 110412715A
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- lens
- camera lens
- diopter
- camera
- image
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- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 230000003287 optical effect Effects 0.000 claims description 26
- 238000003384 imaging method Methods 0.000 claims description 11
- 239000011521 glass Substances 0.000 claims description 7
- 238000009738 saturating Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 claims description 2
- 230000005499 meniscus Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 4
- 238000005286 illumination Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000008859 change Effects 0.000 description 2
- 210000003128 head Anatomy 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 210000001747 pupil Anatomy 0.000 description 2
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0035—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having three lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lenses (AREA)
Abstract
A kind of camera lens, comprising the first lens group, aperture and the second lens group with positive diopter with positive diopter is set in sequence from the first side to second side.Wherein camera lens includes to have the lens total number of diopter less than 4, and these lens include the lens that at least 2 refractive index are greater than 1.7.
Description
Technical field
The present invention relates to a kind of camera lens and its manufacturing methods.
Background technique
In recent years with the progress of science and technology, the type of camera lens is increasingly polynary, and the infrared ray camera lens applied to 3D sensor is one
The common camera lens of kind.Requirement at present for slimming and optical property is also higher and higher, to meet the camera lens of such demand, greatly
It needs to have the features such as low cost, large aperture and lightweight in cause.Therefore, need at present it is a kind of can take into account lightweight, and can provide
The design of the sampling image lens of lower manufacturing cost and preferable image quality.
Summary of the invention
Other objects and advantages of the present invention can obtain further from the technical characteristic disclosed by the embodiment of the present invention
Understanding.
A viewpoint according to the present invention, provides a kind of camera lens, has just comprising being set in sequence from the first side to second side
The first lens group, aperture and the second lens group with positive diopter of diopter.Wherein camera lens includes the lens of tool diopter
Total number is less than 4, and these lens include the lens that at least 2 refractive index are greater than 1.7.
Another viewpoint according to the present invention, a kind of camera lens include to be set in sequence along image zoom side to image reduced side
The third lens that the second lens, aperture and the diopter that the first lens, the diopter that diopter is negative are positive are positive, and camera lens accords with
Following condition: 0.2 < L3D/LT < 0.45 is closed, wherein L3D is the lens surface diameter that the third lens face image reduced side, and LT is
First lens face faces the lens surface of image reduced side to the lens surface of image zoom side to the third lens, along camera lens optical axis
Distance.
Another viewpoint according to the present invention, a kind of camera lens include to be set in sequence along image zoom side to image reduced side
The second lens group that the first lens group, aperture and the diopter that diopter is positive are positive, wherein the first lens group is by tool diopter
The first and second lens formed, the second lens group is made of the third lens of tool diopter, and camera lens meets following item
Part: 2.5 < EFL < 3.0 and -2.0 < L1f/EFL < -1.4, wherein EFL is the effective focal length of the camera lens, and L1f is first lens
Effective focal length.
Above-mentioned viewpoint according to the present invention, it is possible to provide it is a kind of to take into account lightweight, and can provide lower manufacturing cost and
The lens design of preferable image quality.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects, features and advantages of the invention can
It is clearer and more comprehensible, it is special below to lift preferred embodiment, and cooperate attached drawing, detailed description are as follows.
Detailed description of the invention
Fig. 1 is the schematic diagram according to the camera lens 10a of one embodiment of the invention.
Fig. 2 to Fig. 4 is respectively light sector diagram, curvature of field figure and the distortion figure and relative illumination figure of camera lens 10a.
Fig. 5 is the schematic diagram according to the camera lens 10b of one embodiment of the invention.
Fig. 6 to Fig. 8 is respectively light sector diagram, curvature of field figure and the distortion figure and relative illumination figure of camera lens 10b.
Specific embodiment
In relation to addressing other technologies content, feature and effect before the present invention, the embodiment of schema is referred in following cooperation
Detailed description in, can clearly present.The direction term being previously mentioned in following embodiment, such as: it is upper and lower, left and right, preceding
Or it is rear etc., it is only the direction with reference to annexed drawings.Therefore, the direction term used is intended to be illustrative and not intended to limit this hair
It is bright.
In addition, term used in the following example " first ", " second " are to recognize the same or similar element
And use, Bing is non-to limit the element.
The so-called optical element of the present invention means that there is element the material that can be reflected or penetrate partially or in whole to be constituted,
It generally comprises glass or plastic cement is formed.E.g. lens, prism or aperture.
When camera lens is applied in image-taking system, image zoom side-line refers in optical path one locating for close subject
Side, image reduced side then mean the side of the closer photosensitive element in optical path.
The object side (or image side surface) of one lens has the convex surface part (or concave part) positioned at certain region, refers to the region phase
Compared with radially close to the lateral area in the region, court is parallel to the direction more " outwardly convex " (or " being recessed inwardly ") of optical axis
For.
Fig. 1 is the camera lens configuration diagram of first embodiment of the invention.Fig. 1 is please referred to, in the present embodiment, camera lens 10a
Have a lens barrel (not being painted), is contained in lens barrel from the first side (image zoom side OS) toward second side (image reduced side IS) arrangement
First lens L1, the second lens L2, aperture 14 and the third lens L3.First lens L1 and the second lens L2 may make up to have and just bend
The first lens group (for example, before group) 20 of luminosity, the third lens L3 may make up with positive diopter the second lens group (such as
It is rear group) 30.Furthermore the settable glass cover 16 of image reduced side IS and Image Sensor (not shown), camera lens 10a's
Imaging surface is denoted as 18 in 850nm effective focal length, glass cover 16 be located at the second lens group 30 and imaging surface 18 in effective focal length it
Between.In this present embodiment, the diopter of the first lens L1 to the third lens L3 is respectively negative, positive, just, and the first lens and third
Lens are aspherical glass lens, but the embodiment of the present invention is not limited thereto system.The image of each specific embodiment of the present invention is put
Big side OS is respectively arranged on the left side of each figure, and image reduced side IS is set to the right side of each figure, by not repeated explanation it.
Meaning aperture 14 of the invention refers to an aperture diaphragm (Aperture Stop), and aperture is an independent component or whole
Together on other optical elements.In this present embodiment, aperture is to remove marginal ray using mechanism member gear and to retain mid portion saturating
The mode of light is similar to achieve the effect that, and aforementioned so-called mechanism member can be it is adjustable.It is so-called adjustable, refer to mechanism
The adjustment of the position, shape or transparency of part.Or aperture slot can be coated with opaque light absorbent in lens surface,
And it is made to retain central part light transmission to reach the effect of limitation optical path.
Each lens system defines the diameter on a surface.For example, as shown in Figure 1, the diameter on surface refers to this in optical axis
Mirror surface turning point P, the Q at 12 both ends is in the distance (such as the diameter D1 on surface) on 12 direction of vertical optical axis.Furthermore in this implementation
In example, the diameter of surface S7 is 5.6mm.
The lens of camera lens 10a and its design parameter of peripheral element are as shown in Table 1.However, the data cited by hereinafter
It is not intended to limit the invention, any person with usual knowledge in their respective areas is after referring to the present invention, when can be to its parameter
Or change appropriate is made in setting, precisely because it should be within the scope of the invention.
Table one
In Table 1, spacing refers to be between two adjacent surfaces along the linear distance of the optical axis 12 of camera lens 10a.Example
If the spacing of surface S1 is between surface S1 and surface S2 and along the linear distance of optical axis 12.Each lens phase in comment field
Spacing, refractive index and the Abbe number answered need the numerical value referring to corresponding spacing, refractive index and Abbe number in same row.In addition, In
In table one, surface S1 and surface S2 is two surfaces of the first lens L1.Surface S3 and surface S4 is two of the second lens L2
Surface ... waits that the rest may be inferred.Surface S5 is aperture 14.Surface S8 is the imaging surface 18 of camera lens 10a.
The * that surface occurs in table means that the surface is non-spherical surface, and if not indicating the meaning as spherical surface.
In following each design example of the invention, aspherical multinomial is indicated with following equation:
Above-mentioned formula has been widely used.For example, Z is the offset (sag) of optical axis direction, and c is osculating sphere
The inverse of the radius of (osculating sphere), that is, it is reciprocal close to the radius of curvature at optical axis 12, k is circular cone coefficient
(conic constant), r are aspherical height, as from lens centre toward the height of rims of the lens.α i respectively represents aspheric
The polynomial each rank asphericity coefficient in face.Table two is listed in the present embodiment, each rank aspheric of aspherical lens surface in camera lens 10a
Face coefficient and circular cone coefficient value.
Table two
| Surface | K | α4 | α6 | α8 |
| S1* | -3.97 | -9.92E-04 | 1.42E-05 | -1.03E-07 |
| S2* | -0.99 | -2.25E-05 | -1.06E-04 | 1.97E-06 |
| S6* | -7.58 | 2.80E-03 | -8.42E-05 | 2.41E-06 |
| S7* | 0 | 3.51E-03 | 6.95E-06 | 4.47E-06 |
Radius of curvature refers to the inverse of curvature.Radius of curvature is timing, and the centre of sphere of lens surface is reduced in the image of lens
Side direction.When radius of curvature is negative, the image zoom side direction of the centre of sphere of lens surface in lens.And the convex-concave of each lens is visible
Table one.
F-number system of the invention is represented with F/#, such as one person of mark of table.Camera lens of the present invention is applied in optical projection system
When, imaging surface is light valve surface.And when camera lens is applied in image-taking system, imaging surface then means photosensitive member surface.
In the present invention, camera lens overall length system is indicated with LT.More particularly, camera lens overall length of the invention refers to camera lens 10a
Optical surface S1 closest to image zoom side and between the optical surface S7 closest to image reduced side is measured along optical axis 12
Distance, such as one person of mark of table.
In the present invention, lens imaging overall length system is indicated with TTL.More particularly, lens imaging overall length of the invention is
Refer to camera lens 10a closest to the distance between the optical surface S1 and imaging surface S8 of image zoom side, measured along optical axis 12, such as table one
Mark person.
In the present embodiment, the effective focal length of the first lens group (preceding group) is 108.48mm, and the second lens group (rear group) has
Effect focal length is 5.57mm, the effective focal lengths of the first lens is -4.52mm, is to be indicated with L1f.
Fig. 2 to Fig. 4 is the image optics analogue data figure of the present embodiment camera lens 10a.Fig. 2 is the light sector diagram of infrared light
(ray fan plot), wherein X-axis is position of the light by entrance pupil, and Y-axis is that chief ray is projected to as plane (such as imaging surface
S8 the relative value of position).Fig. 3 is the curvature of field (field curvature) figure and distortion (distortion) figure, the wherein curvature of field
The horizontal axis of figure, which is represented, to be represented with focal plane distance, the longitudinal axis from 0 to maximum field；The horizontal axis of distortion figure represents distortion percentage
It represents than, the longitudinal axis from 0 to maximum field.Fig. 4 shows the relative illumination of camera lens 10a.It can be seen that the mirror of Fig. 1 by Fig. 2 to Fig. 4
Head 10a has good image quality, thus can verify that the camera lens 10a of the present embodiment can actually have both good optical imagery
The characteristic of quality.
The camera lens of one embodiment of the invention may include two lens groups, and preceding group for example can be used the lens for having negative diopter
(such as first lens L1), the lens (such as second lens L2) with unification tool positive diopter are to improve receipts light ability, but its
It does not limit.The f-number of camera lens is less than or equal to 2.2.Group may include a non-spherical lens (such as the third lens L3) to correct afterwards
Aberration.The total the piece number of lens that camera lens has diopter is less than 4, and camera lens includes that at least 2 refractive index are greater than 1.7 or at least 2
Lens of the piece Abbe number less than 50.
In an embodiment, camera lens may conform to 2.5 < EFL < 3.0, may conform to 2.6 < EFL < 2.9 in another embodiment, in again
Another embodiment may conform to 2.65 < EFL < 2.85, and wherein EFL is the effective focal length of camera lens.Furthermore camera lens may conform to -2.0 <
L1f/EFL < -1.4 may conform to -1.95 < L1f/EFL < -1.5 in another embodiment, it may conform to -1.9 in still another embodiment <
L1f/EFL < -1.6, wherein L1f is the effective focal length of the first lens.Enter the light fast convergence of camera lens, so as to allowing to have
Limit obtains preferable optical effect in space.
In an embodiment, camera lens may conform to 0.2 < L3D/LT < 0.45, in another embodiment may conform to 0.23 < L3D/LT <
0.43, it may conform to 0.26 < L3D/LT < 0.42 in still another embodiment, wherein L3D is the third lens L3 towards image reduced side IS
The surface diameter of (second side), LT is surface S1 of first lens face to image zoom side OS of camera lens, until last a piece of lens
In face of length of the surface S7 on optical axis 12 of image reduced side IS.So as to allowing the image formation by rays for entering camera lens in image sensing
Device, to obtain preferable optical effect in the confined space.
It will be described below the design of the second embodiment of camera lens of the invention.Fig. 5 is the camera lens of second embodiment of the invention
10b configuration diagram.In this present embodiment, the diopter of the first lens L1 to the third lens L3 of camera lens 10b be negative respectively,
Just, just, whole lens are glass lens, and the first lens L1 and the third lens L3 is non-spherical lens, in this present embodiment,
Non-spherical lens can be as made by glass moulding.Furthermore in this present embodiment, the diameter of surface S7 is 6.08mm.In camera lens 10b
Lens and its peripheral element design parameter it is as shown in Table 3.
Table three
Table four is listed in the second embodiment of the present invention, each rank asphericity coefficient of the aspherical lens surface of camera lens and two
Secondary surface coefficients value.
Table four
In the present embodiment, the effective focal length of the first lens group (preceding group) is 24.83mm, the second lens group (rear group) it is effective
Focal length is 4.63mm, the effective focal length of the first lens is -4.87mm, is to be indicated with L1f
Fig. 6 to Fig. 8 is the image optics analogue data figure of the present embodiment camera lens 10b.Fig. 6 is the light sector diagram of infrared light
(ray fan plot), wherein X-axis is position of the light by entrance pupil, and Y-axis is that chief ray is projected to as plane (such as imaging surface
S8 the relative value of position).Fig. 7 is the curvature of field (field curvature) figure and distortion (distortion) figure, the wherein curvature of field
The horizontal axis of figure, which is represented, to be represented with focal plane distance, the longitudinal axis from 0 to maximum field；The horizontal axis of distortion figure represents distortion percentage
It represents than, the longitudinal axis from 0 to maximum field.Fig. 8 shows the relative illumination of camera lens 10b.It can be seen that the mirror of Fig. 5 by Fig. 6 to Fig. 8
Head 10b has good image quality, thus can verify that the camera lens 10b of the present embodiment can actually have both good optical imagery
The characteristic of quality.As known from the above, the embodiment of the present invention can be applied to 3D sensor, using wavelength be 850nm, limited
There is provided in space it is a kind of can take into account lightweight, and the lens design of lower manufacturing cost and preferable image quality can be provided.
The above described is only a preferred embodiment of the present invention, be not intended to limit the present invention in any form, though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention, any technology people for being familiar with this profession
Member, without departing from the scope of the present invention, when the method and technique content using the disclosure above make it is a little more
Equivalent embodiment that is dynamic or being modified to equivalent variations, but anything that does not depart from the technical scheme of the invention content, according to the present invention
Technical spirit any simple modification, equivalent change and modification to the above embodiments, still fall within technical solution of the present invention
In the range of.
Claims (10)
1. a kind of camera lens, characterized by comprising:
One first lens group and diopter being positive along one first side to the diopter that a second side is set in sequence be positive one
Two lens groups；And
One aperture is set between first lens group and second lens group；
Wherein the camera lens includes to have the lens total number of diopter less than 4, and wherein those lens include that at least 2 refractive index are big
In 1.7 lens.
2. a kind of camera lens, characterized by comprising:
One first lens group and diopter being positive along an image zoom side to the diopter that an image reduced side is set in sequence be
One second positive lens group；And
One aperture is set between first lens group and second lens group；
Wherein first lens group is made of one first lens and one second lens of tool diopter, and second lens group is by having
One the third lens of diopter are formed, and the camera lens meets following condition:
2.5 < EFL < 3.0 and -2.0 < L1f/EFL < -1.4, wherein EFL is the effective focal length of the camera lens, and L1f is first lens
Effective focal length.
3. a kind of camera lens, characterized by comprising:
One first lens, the diopter being negative along an image zoom side to the diopter that an image reduced side is set in sequence are positive
The third lens that one second spherical lens, an aperture and diopter are positive；And
The camera lens meets following condition:
0.2 < L3D/LT < 0.45, wherein L3D is the lens surface diameter that the third lens face the image reduced side, and LT is should
First lens face faces the lens surface of the image reduced side to the lens surface of the image zoom side to the third lens, and edge should
One distance of one optical axis of camera lens.
4. the camera lens as described in any one of claims 1 to 3, which is characterized in that the camera lens includes at least 2 Abbe numbers less than 50
Lens.
5. the camera lens as described in any one of claims 1 to 3, which is characterized in that the camera lens meets one of following condition: (1) In
Include a piece of non-spherical lens between first side or the image zoom side and the aperture, (2) in the aperture and the second side or
It only include a piece of non-spherical lens between the image reduced side, the material of (3) all lens is made of glass.
6. the camera lens as described in any one of claims 1 to 3, which is characterized in that the f-number of the camera lens is less than or equal to 2.2.
7. the camera lens as described in any one of claims 1 to 3, which is characterized in that the camera lens overall length of the camera lens is less than 20.
8. the camera lens as described in any one of claims 1 to 3, which is characterized in that the lens imaging overall length of the camera lens is between 20 Hes
Between 40.
9. the camera lens as described in any one of claims 1 to 3, which is characterized in that the camera lens meets one of following condition: (1) certainly
First side or the image zoom side to second side or the image reduced side are sequentially meniscus, biconvex lens and lenticular
Mirror, (2) are sequentially that non-spherical lens, spherical surface are saturating from first side or the image zoom side to second side or the image reduced side
Mirror and non-spherical lens.
10. a kind of camera lens manufacturing method, characterized by comprising:
One lens barrel is provided；
One first lens group that diopter is positive and one second lens group that diopter is positive are placed in and are fixed in the lens barrel,
Wherein lens total number of the camera lens comprising diopter is less than 4, and those lens include that at least 2 refractive index are saturating greater than 1.7
Mirror.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810386754.3A CN110412715A (en) | 2018-04-26 | 2018-04-26 | Camera lens and its manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810386754.3A CN110412715A (en) | 2018-04-26 | 2018-04-26 | Camera lens and its manufacturing method |
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| CN110412715A true CN110412715A (en) | 2019-11-05 |
Family
ID=68345717
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|---|---|---|---|
| CN201810386754.3A Pending CN110412715A (en) | 2018-04-26 | 2018-04-26 | Camera lens and its manufacturing method |
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| CN (1) | CN110412715A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112925084A (en) * | 2019-12-06 | 2021-06-08 | 声远精密光学股份有限公司 | Fingerprint identification module and optical imaging lens |
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| CN202916485U (en) * | 2012-11-08 | 2013-05-01 | 中山联合光电科技有限公司 | Small size, high resolution and infrared confocal optical system |
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| JP5997863B2 (en) * | 2013-08-19 | 2016-09-28 | 日立マクセル株式会社 | Imaging lens system and imaging apparatus provided with the same |
| JP2017003639A (en) * | 2015-06-05 | 2017-01-05 | 日本電産サンキョー株式会社 | Radiographic image detection lens device |
| CN206321869U (en) * | 2017-02-24 | 2017-07-11 | 东莞市宇光光电科技有限公司 | Inside peep and use imaging lens optical system |
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2018
- 2018-04-26 CN CN201810386754.3A patent/CN110412715A/en active Pending
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|---|---|---|---|---|
| JP2003177314A (en) * | 2001-12-10 | 2003-06-27 | Minolta Co Ltd | Zoom lens |
| CN101149464A (en) * | 2006-09-19 | 2008-03-26 | 富士能株式会社 | Imaging lens and camera system including the same lens |
| CN202916485U (en) * | 2012-11-08 | 2013-05-01 | 中山联合光电科技有限公司 | Small size, high resolution and infrared confocal optical system |
| JP5997863B2 (en) * | 2013-08-19 | 2016-09-28 | 日立マクセル株式会社 | Imaging lens system and imaging apparatus provided with the same |
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| JP2017003639A (en) * | 2015-06-05 | 2017-01-05 | 日本電産サンキョー株式会社 | Radiographic image detection lens device |
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| CN112925084A (en) * | 2019-12-06 | 2021-06-08 | 声远精密光学股份有限公司 | Fingerprint identification module and optical imaging lens |
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Effective date of registration: 20240126 Address after: No. 7, Xin'an Road, Hsinchu City, Hsinchu Science Industrial Park, Taiwan, China, China Applicant after: YOUNG OPTICS INC. Country or region after: Taiwan, China Address before: No. 5 Wenhua Road, Fengshan Village, Hukou Township, Hsinchu County Applicant before: Rays Optics Inc. Country or region before: Taiwan, China |
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