CN103576291A - Camera lens - Google Patents
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- CN103576291A CN103576291A CN201210268868.0A CN201210268868A CN103576291A CN 103576291 A CN103576291 A CN 103576291A CN 201210268868 A CN201210268868 A CN 201210268868A CN 103576291 A CN103576291 A CN 103576291A
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- lens
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- camera lens
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Abstract
The invention relates to a camera lens which comprises a first lens. The first lens can absorb infrared light and comprises a first surface and a second surface, the first surface faces an object side, and the second surface faces an image side. The camera lens can reduce colour cast and ghost images and eliminate infrared noise, and image quality is improved.
Description
Technical field
The present invention is relevant for a kind of camera lens, particularly relevant for a kind of camera lens that uses IR-cut lens.
Background technology
General digital camera, digital camera or the products such as mobile phone with camera function all include camera lens and image sensor (for example CCD or CMOS), camera lens converges to image sensor for the light that object is sent, image sensor converts the light signal receiving to electric signal again, for subsequent treatment.Image sensor itself, except the visible ray signal that object sensing sends, can also sense infrared light (IR) signal that wavelength is greater than 750nm, and this unnecessary infrared light signal, by causing taken image to produce colour cast, has a strong impact on image quality.
The colour cast causing in order to solve above-mentioned infrared light, general known solution as shown in Figure 1, adds a slice cutoff filter (IR Cut Filter), in order to the unnecessary infrared light signal of filtering between camera lens and image sensor.Fig. 1 is known mobile lens schematic diagram, and known mobile lens 1 is from thing side to comprising first lens 11, the second lens 12, the 3rd lens 13 and cutoff filter 14 as side.During imaging, the known mobile lens 1 of light directive being sent by thing side, sequentially passes through first lens 11, the second lens 12, the 3rd lens 13 and cutoff filter 14, then converges to image sensor 17.14 visible rays that allow object to send of cutoff filter pass through, but the infrared light that does not allow object to send passes through, and can avoid image sensor to receive infrared light signal, thereby obtain good image.
Although above-mentioned known method can disturb caused colour cast problem by modifying factor infrared light, but known cutoff filter can become large because of the incident angle of incident beam, cause it to penetrate light splitting figure and move toward short wavelength's direction, larger its of the incident angle of incident beam penetrates light splitting figure and toward short wavelength, moves just more obvious.0 in the Fig. 1 of take degree light beam 15 and 26 degree light beams 16 are example, 0 degree light beam 15 is wherein 0 degree with the angle of optical axis OA, 26 degree light beams 16 are 26 degree with the angle of optical axis OA, this two light beam penetrates light splitting figure as shown in Figure 2 after by known mobile lens 1, transverse axis in Fig. 2 represents wavelength (its unit is nm), the longitudinal axis represents penetrance (its unit is %), wherein the light splitting figure that penetrates of 26 degree light beams 16 obviously departs from penetrating light splitting figure and moving toward short wavelength's direction of 0 degree light beam 15, in addition, the average penetration rate of two light beams in visible-range (420nm ~ 680nm) differs greatly, in infrared light scope (750nm ~ 1200nm), still have some remaining infrared lights to pass through, this will cause colour cast, producing ghost and infrared light noise cannot eliminate completely, affect the quality of image.
Summary of the invention
The technical problem to be solved in the present invention is, can affect the defect of the quality of image for camera lens of the prior art, and a kind of camera lens is provided, and can reduce colour cast, ghost and eliminate infrared light noise, and the quality of image is improved.
The present invention is that the technical scheme that its technical matters of solution adopts is, a kind of camera lens is provided, and comprises first lens, and for absorbing infrared light lens, first lens comprises first surface and second surface, and first surface is towards thing side, and second surface is towards picture side.
Wherein, the curvature of second surface is little compared with first surface.
Wherein, first lens more comprises infrared cut-off light filtering films, is overlying on second surface.
Wherein, first lens more comprises anti-reflective film, is overlying on first surface.
Or first lens more comprises infrared cut-off light filtering films, is overlying on first surface.
Or first lens more comprises anti-reflective film, is overlying on second surface.
Wherein, the material of first lens can be smalt.
Camera lens of the present invention can more comprise the second lens, and first lens and the second lens are from thing side to sequentially arranging as side.
Wherein, the material of the second lens can be plastics or glass.
Implement camera lens of the present invention, there is following beneficial effect: the surface at its IR-cut lens respectively plates one deck infrared cut-off light filtering films and anti-reflective film, it penetrates the problem that light splitting figure moves toward short wavelength's direction after by camera lens can to suppress wide-angle incident light, reduce wide-angle incident light and low-angle incident light by the average penetration rate difference in visible-range (420nm ~ 680nm) after camera lens, and reduce wide-angle incident light and low-angle incident light and pass through the average penetration rate value in infrared light scope (750nm ~ 1200nm) after camera lens, use minimizing colour cast, ghost and elimination infrared light noise, the quality of image is improved.In addition, the present invention does not need to use cutoff filter, except saving the cost of cutoff filter, also can shorten lens length.
Accompanying drawing explanation
For above-mentioned purpose of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly also coordinates accompanying drawing to elaborate.
Fig. 1 is known mobile lens schematic diagram.
Fig. 2 be the 0 degree light beam and 26 of known mobile lens spend light beams penetrate light splitting figure.
Fig. 3 is the schematic diagram according to the embodiment of the camera lens of use IR-cut lens of the present invention.
Fig. 4 be according to the 0 degree light beam and 26 of the camera lens of use IR-cut lens of the present invention, spend light beams penetrate light splitting figure.
Embodiment
Refer to Fig. 3, Fig. 3 is the schematic diagram according to the embodiment of the camera lens of use IR-cut lens of the present invention.Camera lens 3 is from thing side to comprising first lens 31, the second lens 32 and the 3rd lens 33 as side.First lens 31 comprises first surface 311 and second surface 312, and first surface 311 is towards thing side, and second surface 312 is towards picture side.The plated surface of first surface 311 is covered with anti-reflective film 3111, and the plated surface of second surface 312 is covered with infrared cut-off light filtering films 3121.During imaging, the light directive camera lens 3 being sent by thing side, sequentially converges to image sensor 36 again through first lens 31, the second lens 32 and the 3rd lens 33, and image sensor 36 converts the light signal receiving to electric signal again, for subsequent treatment.
Under will with test data, further illustrate the advantage of the camera lens of use IR-cut lens of the present invention with respect to known mobile lens.Fig. 2 be the 0 degree light beam and 26 of known mobile lens spend light beams penetrate light splitting figure.Fig. 4 be according to the 0 degree light beam and 26 of the camera lens of use IR-cut lens of the present invention, spend light beams penetrate light splitting figure.Comparison diagram 2 can be found with Fig. 4,50% width that penetrates light splitting figure of the degree light beam of 0 in Fig. 4 and 26 degree light beams is respectively 645nm and 644nm, differ 1mm, and 50% width that penetrates light splitting figure of the degree light beam of 0 in Fig. 2 and 26 degree light beams is respectively 645nm and 630nm, differ 15mm, the result of Fig. 4 is clearly better than Fig. 2, and the colour cast that this camera lens that means use IR-cut lens of the present invention produces is less than known mobile lens.
In Fig. 40 degree light beam and 26 degree light beams are respectively 78% and 75% in the average penetration rate of visible-range (420nm ~ 680nm), its change value is 3%, in Fig. 20 degree light beam and 26 degree light beams are respectively 86% and 79% in the average penetration rate of visible-range (420nm ~ 680nm), its change value is 7%, the result of same Fig. 4 is better than Fig. 2, and the ghost that this camera lens that means use IR-cut lens of the present invention produces is now as being less than known mobile lens.
In Fig. 40 degree light beam and 26 degree light beams are respectively 0.73% and 0.16% in the average penetration rate of infrared light scope (750nm ~ 1200nm), in Fig. 20 degree light beam and 26 degree light beams are respectively 4.2% and 8.8% in the average penetration rate of infrared light scope (750nm ~ 1200nm), the result of Fig. 4 is clearly better than Fig. 2, and the ability that this camera lens that means use IR-cut lens of the present invention is eliminated infrared light noise is better than known mobile lens.
Except the advantage of the above-mentioned lifting quality of image, the camera lens of use IR-cut lens of the present invention does not need to use cutoff filter, except saving the cost of cutoff filter, also can shorten lens length.
The camera lens of the use IR-cut lens shown in Fig. 3 is three-chip type lens arrangement, yet can recognize, other number lens arrangement (, two, four or more than) also can be implemented, and must belong to scope of the present invention.
While being used in mobile lens, the material of first lens 31 of the present invention can be smalt, and the material of the second lens 32 can be plastics or glass, and the material of the 3rd lens 33 also can be plastics or glass.Yet can recognize, the present invention is not limited to this embodiment, and still visual actual conditions change the material that each lens use.
If lens surface curvature less (more smooth), on manufacturing, infrared cut-off light filtering films 3121 plating are easier to even in lens surface time ratio, and in the above-described embodiments, because second surface 312 is little compared with the curvature of first surface 311, so in first surface 311 plating anti-reflective films 3111, and second surface 312 plating infrared cut-off light filtering films 3121.Yet can recognize, if changed, be formed in first surface 311 plating infrared cut-off light filtering films 3121, and second surface 312 plating anti-reflective films 3111 also can reach identical effect, and should belong to category of the present invention.
Although the present invention discloses as above with preferred embodiment; but it is not in order to limit the present invention, those skilled in the art person, without departing from the spirit and scope of the present invention; still can do a little change and retouching, so protection scope of the present invention is when being as the criterion depending on the claim person of defining.
Claims (10)
1. a camera lens, is characterized in that, comprising:
First lens, for absorbing infrared light lens, comprises first surface and second surface, and this first surface is towards thing side, and this second surface is towards picture side.
2. the camera lens as described in claim 1, is characterized in that, the curvature of this second surface this first surface is little.
3. camera lens as claimed in claim 2, is characterized in that, this first lens more comprises infrared cut-off light filtering films, and this infrared cut-off light filtering films is overlying on this second surface.
4. camera lens as claimed in claim 3, is characterized in that, this first lens more comprises anti-reflective film, and this anti-reflective film is overlying on this first surface.
5. camera lens as claimed in claim 2, is characterized in that, this first lens more comprises infrared cut-off light filtering films, and this infrared cut-off light filtering films is overlying on this first surface.
6. camera lens as claimed in claim 5, is characterized in that, this first lens more comprises anti-reflective film, and this anti-reflective film is overlying on this second surface.
7. camera lens as claimed in claim 1, is characterized in that, the material of this first lens is smalt.
8. camera lens as claimed in claim 1, is characterized in that, it more comprises the second lens, and this first lens and this second lens are sequentially arranged as side to this from this thing side.
9. camera lens as claimed in claim 8, is characterized in that, the material of these the second lens is plastics.
10. camera lens as claimed in claim 8, is characterized in that, the material of these the second lens is glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210268868.0A CN103576291A (en) | 2012-07-31 | 2012-07-31 | Camera lens |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210268868.0A CN103576291A (en) | 2012-07-31 | 2012-07-31 | Camera lens |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103576291A true CN103576291A (en) | 2014-02-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210268868.0A Pending CN103576291A (en) | 2012-07-31 | 2012-07-31 | Camera lens |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017015801A1 (en) * | 2015-07-24 | 2017-02-02 | 华为技术有限公司 | Camera module and terminal |
| CN111722359A (en) * | 2019-03-21 | 2020-09-29 | 信泰光学(深圳)有限公司 | Imaging lens |
| WO2021056558A1 (en) * | 2019-09-29 | 2021-04-01 | Huawei Technologies Co., Ltd. | Optical filter free lens system |
| WO2022067951A1 (en) * | 2020-09-29 | 2022-04-07 | 诚瑞光学(深圳)有限公司 | Camera lens |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086551A (en) * | 2006-06-08 | 2007-12-12 | 奥林巴斯映像株式会社 | Zoom lens system and electronic image pickup apparatus using the same |
| TW200918978A (en) * | 2007-10-16 | 2009-05-01 | Aptek Optical Corp | Camera lens and related image reception device capable of filtering infrared and reducing production cost |
| TW201142347A (en) * | 2010-03-24 | 2011-12-01 | Sony Corp | Optical unit and imaging apparatus |
-
2012
- 2012-07-31 CN CN201210268868.0A patent/CN103576291A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101086551A (en) * | 2006-06-08 | 2007-12-12 | 奥林巴斯映像株式会社 | Zoom lens system and electronic image pickup apparatus using the same |
| TW200918978A (en) * | 2007-10-16 | 2009-05-01 | Aptek Optical Corp | Camera lens and related image reception device capable of filtering infrared and reducing production cost |
| TW201142347A (en) * | 2010-03-24 | 2011-12-01 | Sony Corp | Optical unit and imaging apparatus |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017015801A1 (en) * | 2015-07-24 | 2017-02-02 | 华为技术有限公司 | Camera module and terminal |
| US10139532B2 (en) | 2015-07-24 | 2018-11-27 | Huawei Technologies Co., Ltd. | Camera module and terminal |
| CN111722359A (en) * | 2019-03-21 | 2020-09-29 | 信泰光学(深圳)有限公司 | Imaging lens |
| CN111722359B (en) * | 2019-03-21 | 2022-07-12 | 信泰光学(深圳)有限公司 | Imaging lens |
| WO2021056558A1 (en) * | 2019-09-29 | 2021-04-01 | Huawei Technologies Co., Ltd. | Optical filter free lens system |
| WO2022067951A1 (en) * | 2020-09-29 | 2022-04-07 | 诚瑞光学(深圳)有限公司 | Camera lens |
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Application publication date: 20140212 |