CN2696008Y - Optical homogenizer and camera using the optical homogenizer - Google Patents
Optical homogenizer and camera using the optical homogenizer Download PDFInfo
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- CN2696008Y CN2696008Y CN 03224689 CN03224689U CN2696008Y CN 2696008 Y CN2696008 Y CN 2696008Y CN 03224689 CN03224689 CN 03224689 CN 03224689 U CN03224689 U CN 03224689U CN 2696008 Y CN2696008 Y CN 2696008Y
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Abstract
The utility model provides an optical homogenizer, which comprises a shot and an optical attenuator. The shot comprises at least one lens, and the optical attenuator comprises an optical attenuation film and a substrate. Wherein one surface of the substrate is covered with the optical attenuation film. The attenuation coefficient of the optical attenuation film and radiuses from the edge to the center of the optical attenuation film are distributed in a step shape. The optical attenuator is arranged at one side of the lens in order to correct the disproportion of the illumination distribution of the image plane caused by the cosine-fourth law. The optical homogenizer of the utility model can adjust the illumination distribution of the optical imaging equipment such as a camera, etc. The optical property is preferable, and the utility model is flexibly arranged.
Description
[technical field]
The utility model is about a kind of Optical homogenizer, especially about a kind of Optical homogenizer of adjusting optical imaging apparatus Illumination Distribution such as camera.
[background technology]
When optical imaging apparatus such as use camera, the image brilliance that the meeting appearance is presented is inhomogeneous, brighter in the middle of promptly, the phenomenon of dark even unfilled corner all around, because peripheral light amount (Peripheral Illumination) is subjected to the influence of camera lens gradual halation phenomena (Vignetting) and cosine-fourth law (Cos41aw) during imaging, cause illuminance of image plane to distribute, be that the light intensity at the light intensity of central point and the edge of imaging surface exists certain drop (do not wait from 40%～70%, please refer to Fig. 1).
Gradual halation phenomena be since the light that projects the image planes edge not all by effective aperture (being diaphragm diameter), and due to being blocked by the lens frame of aperture front and back, this phenomenon needs only stop down and can eliminate.And cosine-fourth law is meant that the image at image planes edge forms by become the incident beam at certain angle of inclination with optical axis, its lightness and the proportional reduction of inclination cosine of an angle biquadratic, and this is limited by physical law, can't avoid.
Existing this kind of revising has three kinds usually by the method that the illuminance of image plane that cosine-fourth law caused distributes:
One, revises the light-source brightness of irradiation object: block the brightness of light source center section, make illumination in the middle of imaging place level off to the illumination at edge; Add the brightness at intense light source edge, make the illumination at the imaging place edge illumination in the middle of leveling off to.Though the method has certain effect, it not only makes cost increase, and in the actual process of taking pictures, the enforcement of the method is inconvenience extremely.
Two, between object and picture, increase by one with the shadow shield of incident angle horizontally set, and adjust what of restriction luminous flux by its height (middle higher, the edge is lower) distribute so that revise the illuminance of image plane that causes by cosine-fourth law.Because the shadow shield of the method is usually with plastic rubber ejaculate molding, its tolerance is bigger, makes the shadow shield shape inaccurate, thereby influences correction effect.
Three, the signal processor (DSP) by digital still camera handle and revise image sensor (CCD or CMOS) thus the intensity distributions of receiving optical signals is revised the illuminance of image plane that cosine-fourth law causes and is distributed.The method makes the circuit design of signal processor more complicated, thereby causes cost to increase.
No. 97229889 patent of China disclosed a kind of adjustment Illumination Distribution device of imaging device, it comprises lens combination, an aperture diaphragm and a light modulation diaphragm of being made up of at least one lens, aperture diaphragm tool one light transmission part, the light modulation diaphragm vertically is arranged at lens combination first lens front or the back, thereby lighttight light modulation optical gate blocks the light signal of scioptics center section.But, this light modulation optical gate is light tight, and it is too much to cause arriving the object attenuated optical signal of locating in the middle of the image planes, and then influences the illuminance of image plane distribution, secondly, the position that this light modulation optical gate is arranged in the light path must be away from image planes, if near image planes, then the image planes center section can't be accepted the light signal from object, causing can't imaging, in addition, this light modulation shutter shape also is subjected to the effects limit such as shape of optical gate transmittance section, aperture part, thereby influences the design of whole light path.
In view of above shortcoming, be necessary to provide the Optical homogenizer that a kind of optical property is better and can be provided with flexibly.
[summary of the invention]
The purpose of this utility model is to provide a kind of Optical homogenizer, and its optical property better and can be provided with flexibly.
The purpose of this utility model also is to provide a kind of camera of using described Optical homogenizer.
Optical homogenizer described in the utility model comprises a camera lens and an optical attenuator, and this camera lens comprises at least one lens, and this optical attenuator comprises a light attenuation foil, and in order to adjust the optics illumination of this camera lens imaging, this optical attenuator is arranged at lens one side.
The camera of application Optical homogenizer described in the utility model, comprise a camera lens and an image sensor, this camera lens comprises few lens, and this optical attenuator comprises that this optical attenuator comprises a light attenuation foil, in order to adjust the optics illumination of this camera lens imaging, this optical attenuator is arranged at lens one side.
Compare with existing Optical homogenizer, the utility model Optical homogenizer causes the illuminance of image plane skewness by the optical attenuator correction that a pad value is the stepped distribution by cosine-fourth law, its optical property better and can be arranged at flexibly in the light path, when being used for imaging devices such as camera when the utility model Optical homogenizer, but the light attenuation foil plating of this novel Optical homogenizer is in a surface of the infrared filter of camera or a surface of the cover glass of image sensor, thereby when correction causes the illuminance of image plane skewness by cosine-fourth law, can reduce the volume of camera, and need not to be provided with in addition corresponding fixing structure and can reducing cost.
[description of drawings]
Fig. 1 is that the light signal of object is through the Illumination Distribution curve map of lens imaging in imaging surface;
Fig. 2 is the pad value distribution plan of the non-homogeneous optical attenuator of the utility model Optical homogenizer;
Fig. 3 be the light signal of object after this novel Optical homogenizer correction in the Illumination Distribution curve map of imaging surface;
Fig. 4 is the structural representation of the utility model Optical homogenizer.
[embodiment]
The utility model Optical homogenizer 10 comprises a camera lens (not indicating) and a non-homogeneous optical attenuator 20, consult Fig. 4, wherein camera lens comprises at least one lens 12, and the light signal from object is to successively decrease to the edge in the middle of imaging surface by this lens imaging in the Illumination Distribution of imaging surface, illumination differs and is A, this Illumination Distribution curve as shown in Figure 1, non-homogeneous optical attenuator 20 comprises a light attenuation foil 22 and a substrate 21, the pad value of light attenuation foil 22 be stepped to these light attenuation foil 22 radius centered and distribute (as shown in Figure 2), pad value in the G point radius scope is α, the extraneous pad value of G point radius is 0, and the G of light attenuation foil 22 point radius length and pad value α distribute according to the illuminance of image plane of being desired to reach in the Illumination Distribution curve and the institute of image planes by the object of camera lens decision to determine, substrate 21 can by an optical property preferably leaded light material (as glass) make, light attenuation foil 22 is to adopt optical coating technology plating in these substrate 21 1 surfaces, this non-homogeneous optical attenuator 20 can be arranged at lens 12 fronts or back, and itself and this coaxial setting in lens 12 centers.
When non-homogeneous optical attenuator 20 is arranged at the lens back, the lens by camera lens at first from the light signal of object, because of cosine-fourth law causes the middle partly light intensity of light signal of scioptics greater than the edge part, this non-homogeneous light signal is again by non-homogeneous optical attenuator, because of being stepped, the pad value of non-homogeneous optical attenuator 20 distributes, so be attenuated by the light signal in its G point radius scope, and can not be attenuated by the extraneous light signal of its G point radius, after this revises, the light signal of object is more even in the light intensity distributions of imaging surface, illumination differs (and the B＜A) into B, its Illumination Distribution curve is shown in the 3rd figure, and therefore correction causes the illuminance of image plane skewness by cosine-fourth law.
Be appreciated that when non-homogeneous optical attenuator 20 is arranged at the lens front, from the at first scioptics imaging again after non-homogeneous optical attenuator 20 decay of the light signal of object, the Illumination Distribution curve of imaging surface still as shown in Figure 3, illumination differs and still is B.
The utility model Optical homogenizer 10 is to be used for optical imaging apparatus such as camera, and camera has generally included an infrared filter (IR Cut Filter), it comprises an infrared light Obstruct membrane and a substrate, this infrared light Obstruct membrane plating is in substrate one surface, be appreciated that, when this novel Optical homogenizer 10 is used for this camera (figure does not show), non-homogeneous optical attenuator can be shared a substrate with this infrared filter, be about to the light attenuation foil plating in another surface of infrared filter substrate, thereby can save a substrate, when correction causes the illuminance of image plane skewness by cosine-fourth law, can reduce the volume of camera, and need not to be provided with in addition corresponding fixing structure and can reducing cost.
Be appreciated that, when the utility model Optical homogenizer 10 is used for digital camera (figure does not show), the upper surface of the image sensing component of factor sign indicating number camera (CCD or CMOS) comprises a cover glass, the substrate 21 of the non-homogeneous optical attenuator 20 of this novel Optical homogenizer can omit, be about to the direct plating of light attenuation foil in this cover glass one surface, thereby when correction causes the illuminance of image plane skewness by cosine-fourth law, can reduce the volume of camera, and need not to be provided with in addition corresponding fixing structure and can reducing cost.
Claims (10)
1. an Optical homogenizer comprises that one has the camera lens of lens at least, and it is characterized in that: also comprise an optical attenuator, described optical attenuator comprises a light attenuation foil, and in order to adjust the optics illumination that this camera lens becomes, this optical attenuator is arranged at lens one side.
2. Optical homogenizer as claimed in claim 1 is characterized in that: the pad value of this light attenuation foil be stepped to this light attenuation foil radius centered and distribute.
3. Optical homogenizer as claimed in claim 2 is characterized in that: it is to distribute according to the illuminance of image plane of being desired to reach in the illumination component curve and the institute of image planes by the object of camera lens decision to determine that the pad value of this light attenuation foil distributes.
4. Optical homogenizer as claimed in claim 3 is characterized in that: this optical attenuator further comprises a substrate, and above-mentioned light attenuation foil is to adopt optical coating technology plating in this substrate one surface, and this substrate is made by optical material.
5. use the camera of Optical homogenizer according to claim 1 for one kind, comprise that one has the camera lens and an image sensor of lens at least, it is characterized in that: also comprise an optical attenuator, described optical attenuator comprises a light attenuation foil, in order to adjust the optics illumination of this camera lens imaging, this optical attenuator is arranged at lens one side.
6. camera as claimed in claim 5 is characterized in that: this camera also comprises an infrared filter, and it comprises an infrared light Obstruct membrane and a substrate, and this infrared light Obstruct membrane plating is in substrate one surface.
7. camera as claimed in claim 6 is characterized in that: above-mentioned light attenuation foil is that plating is in another surface of substrate.
8. camera as claimed in claim 6 is characterized in that: the substrate of this infrared filter is made by the leaded light material.
9. camera as claimed in claim 5 is characterized in that: this camera further comprises a cover glass, and this cover glass is positioned on the above-mentioned image sensor.
10. camera as claimed in claim 9 is characterized in that: above-mentioned light attenuation foil is the surface of plating in this cover glass.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03224689 CN2696008Y (en) | 2003-03-25 | 2003-03-25 | Optical homogenizer and camera using the optical homogenizer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03224689 CN2696008Y (en) | 2003-03-25 | 2003-03-25 | Optical homogenizer and camera using the optical homogenizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2696008Y true CN2696008Y (en) | 2005-04-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03224689 Expired - Lifetime CN2696008Y (en) | 2003-03-25 | 2003-03-25 | Optical homogenizer and camera using the optical homogenizer |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2696008Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643547A (en) * | 2015-11-04 | 2017-05-10 | 赫克斯冈技术中心 | Compensation of light intensity across a line of light providing improved measuring quality |
-
2003
- 2003-03-25 CN CN 03224689 patent/CN2696008Y/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106643547A (en) * | 2015-11-04 | 2017-05-10 | 赫克斯冈技术中心 | Compensation of light intensity across a line of light providing improved measuring quality |
| US10330466B2 (en) | 2015-11-04 | 2019-06-25 | Hexagon Technology Center Gmbh | Compensation of light intensity across a line of light providing improved measuring quality |
| CN106643547B (en) * | 2015-11-04 | 2020-10-09 | 赫克斯冈技术中心 | Light intensity compensation on light providing improved measurement quality |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20141013 Granted publication date: 20050427 |