CN108055446B - Optical system with movable sensor for compensating back focus - Google Patents
Optical system with movable sensor for compensating back focus Download PDFInfo
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- CN108055446B CN108055446B CN201810055810.5A CN201810055810A CN108055446B CN 108055446 B CN108055446 B CN 108055446B CN 201810055810 A CN201810055810 A CN 201810055810A CN 108055446 B CN108055446 B CN 108055446B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 58
- 238000006073 displacement reaction Methods 0.000 claims description 35
- 239000003086 colorant Substances 0.000 claims description 9
- 238000003384 imaging method Methods 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000001179 sorption measurement Methods 0.000 claims description 8
- 230000006835 compression Effects 0.000 claims description 6
- 238000007906 compression Methods 0.000 claims description 6
- 230000003014 reinforcing effect Effects 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 4
- 238000004088 simulation Methods 0.000 claims description 4
- 238000009434 installation Methods 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 5
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000007499 fusion processing Methods 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 239000003351 stiffener Substances 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N17/00—Diagnosis, testing or measuring for television systems or their details
- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/54—Mounting of pick-up tubes, electronic image sensors, deviation or focusing coils
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N23/00—Cameras or camera modules comprising electronic image sensors; Control thereof
- H04N23/50—Constructional details
- H04N23/55—Optical parts specially adapted for electronic image sensors; Mounting thereof
Abstract
An optical system for movable sensor compensation back focus, comprising: the lens barrel, the lens base and set up the beam splitting prism of multi-beam light on the lens base, be used for receiving the mobile mechanism group of different wavelength light waves and actuating mechanism group, be used for detecting the position sensor that mobile mechanism group initialized reference position and the control module who links to each other with actuating mechanism group and position sensor respectively, wherein: the moving mechanism group can do reciprocating motion along the optical axis direction of any optical path of the beam splitter prism through the driving of the driving mechanism group, the position sensor detects the initial reference position of the moving mechanism group and calculates the position parameters and the target positions of the moving sensor under different multiplying powers through the control module, so that control instructions are obtained and output to the driving mechanism group to realize the accurate movement of the moving mechanism group along the optical axis direction under different multiplying powers. The invention can realize that different light paths are focused clearly at the same time under the whole-course multiplying power.
Description
Technical Field
The invention relates to a technology in the field of optical devices, in particular to an optical system with a movable sensor for compensating back focus.
Background
The existing market has realized a lens of a single horizontal light path, and of course, some lenses also realize a technology of dividing the light path into multiple light paths with different spectrums by using a light splitting element and then correspondingly entering a corresponding chip for simultaneous imaging. But the problem of confocal with respect to multiple light paths to the imaging plane remains difficult to solve. Although some technologies adopt the technology of switching the thickness of the optical filter in the optical path to adjust the back focus of the optical path, the imaging is clear under partial multiplying power, but the adjustable range is a plurality of fixed multiplying powers, and the clear imaging of the lens under the whole multiplying power is difficult to ensure.
Disclosure of Invention
Aiming at the defect that the existing multi-light path lens cannot realize confocal and causes blurring of image quality and smaller dynamic focusing range of clear imaging, the invention provides an optical system with a movable sensor for compensating back focus, which adopts a technology of six-axis focusing by a movable sensor to realize image fusion with high initial magnification and rich colors, the movable sensor and a moving mechanism are fixed into a whole through a glue dispensing device, and the movable sensor can make reciprocating movement along the optical axis direction by the moving mechanism, so that the aim of adjusting the optical back focus is fulfilled. And when the lens is initialized each time, the reference position of the current moving mechanism group is acquired through the position sensor, so that different light paths can be focused clearly at the same time under the whole-course multiplying power.
The invention is realized by the following technical scheme:
the invention comprises the following steps: the lens barrel, the lens base and set up the beam splitting prism of multibeam light on the lens base, be used for receiving the light path sensor of different wavelength light waves, but movable sensor and mobile mechanism group pass through the point and glue mechanism interconnect, be used for driving mobile mechanism and the actuating mechanism group of movable sensor, be used for detecting the position sensor of mobile mechanism group initial reference position and the control module who links to each other with actuating mechanism group and position sensor respectively, wherein: the moving mechanism group can do reciprocating motion along the optical axis direction of any optical path of the beam splitter prism through the driving of the driving mechanism group, the position sensor detects the initial reference position of the moving mechanism group and calculates the position parameters and the target positions of the moving sensor under different multiplying powers through the control module, so that control instructions are obtained and output to the driving mechanism group to realize the accurate movement of the moving mechanism group along the optical axis direction under different multiplying powers.
The invention relates to a calibration compensation method of the optical system, which comprises the following steps:
step 1) light is divided into two light paths through a light splitting element, the two light paths are imaged corresponding to the respective sensors respectively, a fixed picture and a movable picture are calibrated and compared through a computer, and images of multiple light paths under initial multiplying power are compared through a six-axis adjusting device, so that the movable sensor reaches an optimal position state.
And 2) fixing the movable sensor and the moving mechanism group through the dispensing mechanism, and connecting the movable sensor and the moving mechanism group to form a calibrated optical system.
And 3) respectively imaging two light paths of the calibrated optical system and the corresponding sensors, outputting the imaged light paths to a computer, and superposing two sensor pictures to obtain a clear image with high image quality and rich colors.
And 4) the position sensor of the optical system further detects the position of the moving frame and feeds back the position to the computer, the driving mechanism group is controlled through simulation, the high-precision movement of the moving mechanism group is realized, and the back focal value under different multiplying powers can be adjusted, so that the clear image with high image quality and rich colors under all optical design multiplying powers is realized.
Technical effects
Compared with the prior art, the invention can realize multi-light path confocal, and can obtain clear images with high image quality and rich colors under different multiplying powers.
Drawings
FIG. 1 is a schematic diagram of the structure of the present invention;
FIG. 2 is a schematic view of a lens mount;
FIG. 3 is a schematic view of a lens mount;
FIG. 4 is a schematic diagram of a movable sensor;
FIGS. 5 and 6 are schematic diagrams of a moving mechanism set;
FIGS. 7 and 8 are enlarged detail views of the stent;
FIG. 9 is a schematic diagram of a moving frame;
FIG. 10 is a system block diagram;
FIG. 11 is a schematic view of a six-axis adjusting device and a dispensing mechanism
Fig. 12 and 13 are partial enlarged schematic views of a six-axis adjusting device and a dispensing mechanism
In the figure: lens barrel 1, lens mount 2, beam splitter prism 3, moving mechanism group 4, driving mechanism group 5, movable sensor 6, filter group 7, position sensor 8, six-axis adjusting device 9, dispensing mechanism 10, dispensing groove 11, prism mounting chamber 20, light entrance hole 200, light exit hole 201, light exit hole 202, filter 71, filter 72, moving frame 40, light passing hole 400, stiffener 401, guide shaft 41, circular shaft hole 42, U-shaped hole 43, bracket hole group 44, moving sensor bar 45, driving motor 50, bracket 51, clamping plate 61, adsorbing device 90, X-axis direction linear displacement device 91, Y-axis direction linear displacement device 92, Z-axis direction linear displacement device 93, alpha-angle displacement device 94, theta-angle displacement device 95, beta-angle displacement device 96, linear rough adjustment device 97, small bracket hole 442, large bracket hole 441, threaded rod 500, compression spring 510, large bracket shaft 511, small bracket shaft 512, adsorbing table 900, vacuum adsorption device 901, and dispensing 100.
Detailed Description
As shown in fig. 1 and 2, the present embodiment includes: a lens barrel 1, a lens base 2, a beam splitting prism 3 for splitting a plurality of light beams arranged on the lens base 2, an optical filter set 7, a moving mechanism set 4 for receiving light waves with different wavelengths, a driving mechanism set 5 thereof and a position sensor 8 for detecting an initialization reference position of the moving mechanism set 4, wherein: the moving mechanism group 4 can do reciprocating motion along the optical axis direction of the optical path A by driving the driving mechanism group 5, the position sensor 8 detects the initial reference position of the moving mechanism group 4 and calculates the position parameters and the target positions of the moving sensor under different multiplying factors through the control module, so as to obtain control instructions and output the control instructions to the driving mechanism group 5 to realize the accurate movement of the moving mechanism group 4 along the optical axis direction under different multiplying factors.
As shown in fig. 2 and 3, the lens mount 2 includes: a prism mounting chamber 20 with an entrance aperture 200 and an exit aperture 202.
The beam splitting prism 3 is disposed in the prism mounting chamber 20 on the lens base 2, and the light passes through the beam splitting prism 3 capable of splitting the light wave into a plurality of light wave ranges after passing through the light inlet 200, and the light path is split into a light path a and a light path B and is output through the light outlet 201 and the light outlet 202 on the prism mounting chamber 20.
The filter set includes: a filter 71 and a filter 72, wherein: the optical filters 71 and 72 are provided at the light outlet 201 and 202 of the prism mounting chamber 20, respectively, to reject light waves in the excess band range.
As shown in fig. 4 and 5, the moving mechanism group 4 includes: a guide shaft 41 fixedly provided on the lens mount 2, a moving frame 40 slidably connected to the guide shaft 41, and a movable sensor 6 connected to the moving frame 40.
The movable frame 40 is provided with a light passing hole 400 for the light path B to pass through and a reinforcing rib 401. The movable sensor 6 collects light on the light path B through the light passing hole 400, and a gap formed after the movable sensor 6 is matched with the reinforcing rib 401 is the dispensing slot 11.
The movable sensor 6 is provided with a clamping plate 61 which is attached to the adsorption table 900 on the six-axis adjusting device 9.
The number of the guide shafts 41 is two, and the two sides of the corresponding moving frame 40 are respectively provided with a round shaft hole 42 and a U-shaped hole 43 for sliding connection.
As shown in fig. 5, the driving mechanism group 5 includes: a drive motor 50 and a bracket 51 provided at an output end thereof, wherein: the driving motor 50 is fixedly arranged on the lens base 2, the bracket 51 is connected with the moving frame 40, and the driving force of the driving motor 50 enables the moving mechanism group 4 to move smoothly back and forth along the optical axis direction of the optical path B.
The support 51 is preferably connected to the drive motor 50 by means of a threaded rod 500.
As shown in fig. 5 to 7, the bracket 51 includes: a large bracket shaft 511, a compression spring 510 provided on the bracket shaft 511, and a small bracket shaft 512 connected thereto, wherein: the large bracket shaft 511 and the small bracket shaft 512 are respectively contacted with the moving frame 40, and the compression spring 510 generates elastic force in the axial direction of the large bracket shaft 511 after being compressed, thereby ensuring the stability of the bracket 51 and the threaded rod 500 in the process of transmitting to the moving frame 40.
The contact is realized through a shaft hole structure, and specifically comprises the following steps: the moving frame 40 is provided with a bracket hole group 44, and the bracket hole group 44 includes a large bracket hole 441 and a small bracket hole 442 to fit the large bracket shaft 511 and the small bracket shaft 512.
As shown in fig. 8, the moving frame 40 is provided with a movement sensing bar 45, the position sensor 8 detects an initial reference position of the movement sensing bar 45 and outputs the initial reference position to a computer, and the computer controls the driving mechanism group 5 of the system through simulation to realize high-precision movement of the moving mechanism group 4 along the optical axis direction where the optical path B is located. The back focal value of the light path B under different multiplying factors can be adjusted, so that clear images with high image quality and rich colors under all optical design multiplying factors can be realized.
As shown in fig. 10, the system control structure needs to be calibrated and compared by computer assistance, which is as follows:
(1) comparing images in the optical path a and the optical path B and setting the optical path a as a fixed picture, the optical path B as a movable picture, and comparing items including but not limited to: picture definition, picture size, picture center point position.
(2) Specific comparison project requires:
i, definition: reaching the design index of the lens, and judging and reading by using ISO 12233;
II, picture size: the surrounding pictures are overlapped, and the offset of pixel points is less than 5;
III, picture center point position: the center points of the pictures are overlapped, and the offset of the pixel points of the center points is less than 5.
(3) And (3) carrying out fusion processing on the light path A and the light path B images, and carrying out contrast superposition by taking the identified picture center point position as a reference. In order to make the optical path optimal, the relative position between the movable sensor 6 and the moving mechanism group 4 needs to be calibrated to an optimal position in advance.
As shown in fig. 11 and 12, the present invention employs a six-axis adjusting device 9 for calibrating the relative position between the movable sensor 6 and the moving mechanism group 4 to an optimal position in advance, the six-axis adjusting device 9 including: an X-axis direction linear motion device, a Y-axis direction linear motion device, a Z-axis direction linear motion device, an α -angle displacement motion device, a θ -angle displacement motion device, a β -angle displacement motion device, a rough adjustment linear motion device, an adsorption mechanism 90 with an adsorption platform 900 and a vacuum adsorption device 901, wherein: the vacuum suction device 901 is to fit the clamping plate 61 on the movable sensor 6 to the suction stage 900 without gaps so that the movement of the movable sensor 6 and the suction stage 900 can be synchronized.
The calibration specifically comprises the following steps: the method comprises the steps of carrying out a first treatment on the surface of the
1) The displacement of the movable sensor 6 in the X-axis direction is quickly adjusted by the coarse adjustment linear displacement device 97;
2) The displacement of the movable sensor 6 in the X-axis direction is accurately adjusted by the X-axis direction linear displacement device 91;
3) The displacement of the movable sensor 6 in the Y-axis direction is accurately adjusted by the Y-axis direction linear displacement device 92;
4) The displacement of the movable sensor 6 in the Z-axis direction is accurately adjusted by the Z-axis direction linear displacement device 93;
5) The angle of rotation of the movable sensor 6 about the axis X is precisely adjusted by the α rotation angle displacement device 94;
6) The angle of rotation of the movable sensor 6 around the axis Y is accurately adjusted by the θ rotation angle displacement device 95;
7) The angle of rotation of the movable sensor 6 about the axis Z is precisely adjusted by the beta-turn displacement device 96;
the six-axis adjusting device 9 realizes 6-axis complete free adjustment in a strict sense.
As shown in fig. 13, the dispensing mechanism 10 is implemented by using a dispensing pen 100, after the movable sensor 6 is adjusted to an optimal matching position with the moving mechanism set 4 by adjusting the six-axis adjusting device 9, the dispensing pen 100 dispenses glue into a dispensing groove 11 formed by matching a reinforcing rib 401 on the moving frame 4 with the movable sensor 6, so that the movable sensor 6 and the moving frame 40 are fixed, and the movable sensor 6 and the moving mechanism set 4 are connected into an integrated device.
The complete implementation of the invention is as follows:
the light in step 1) can be split into a light path A and a light path B by a light splitting element.
And 2) imaging the sensors corresponding to the light path A and the light path B respectively, and comparing the fixed picture of the light path A with the movable picture of the light path B through a computer.
After the comparison in step 3), the movable sensor 6 is adjusted to the optimal fitting position by the six-axis adjusting device 9.
Step 4) fixing the movable sensor 6 and the moving mechanism group 4 through the dispensing mechanism 10, and connecting the movable sensor 6 and the moving mechanism group 4 into an integrated device.
And 5) superposing the picture of the light path A and the picture of the light path B by computer processing, so that a clear image with high image quality and rich colors can be obtained.
Step 6) there is a position sensor 8 in the system for detecting the position of the moving frame 40, the position sensor 8 feeding back the detected position information to the computer.
Step 7) the computer controls the driving mechanism 5 of the system through simulation, so that the moving mechanism group 4 moves along the optical axis direction of the optical path B with high precision. The back focal value of the light path B under different multiplying factors can be adjusted, so that clear images with high image quality and rich colors under all optical design multiplying factors can be realized.
The foregoing embodiments may be partially modified in numerous ways by those skilled in the art without departing from the principles and spirit of the invention, the scope of which is defined in the claims and not by the foregoing embodiments, and all such implementations are within the scope of the invention.
Claims (7)
1. An optical system for compensating for back focus with a movable sensor, comprising: the lens cone, the lens base and set up the beam splitter prism on the lens base, be used for receiving the mobile mechanism group of different wavelength light waves and actuating mechanism group, be used for detecting the position sensor of mobile mechanism group initial reference position and the control module who links to each other with actuating mechanism group and position sensor respectively, wherein: the moving mechanism group can do reciprocating motion along the optical axis direction of any optical path of the beam splitter prism through the driving of the driving mechanism group, the position sensor detects the initial reference position of the moving mechanism group and calculates the position parameters and the target positions of the moving sensor under different multiplying powers through the control module, so that control instructions are obtained and output to the driving mechanism group to realize the accurate movement of the moving mechanism group along the optical axis direction under different multiplying powers;
the lens base includes: a prism installation chamber with a light inlet and a light outlet; the beam splitting prism is arranged in the prism installation chamber on the lens base, and light rays are split into a plurality of light paths with different light wave ranges by the beam splitting prism after passing through the light inlet holes and are output through the light outlet holes on the prism installation chamber respectively;
the moving mechanism group comprises: the lens comprises a guide shaft fixedly arranged on a lens base, a movable frame connected with the guide shaft in a sliding manner and a movable sensor connected with the movable frame;
the movable frame is provided with a light-passing hole for the light path to pass through and a reinforcing rib; the movable sensor collects light rays on the light path through the light passing holes, and a gap formed after the movable sensor is matched with the reinforcing ribs is a glue dispensing groove;
the guide shafts are two, and a round shaft hole and a U-shaped hole for sliding connection are respectively arranged at two sides of the corresponding moving frame;
the driving mechanism group comprises: driving motor and set up in the support of its output, wherein: the driving motor is fixedly arranged on the lens base, the bracket is connected with the moving frame, and the driving force of the driving motor enables the moving mechanism group to move smoothly and reciprocally along the optical axis direction of the optical path;
the bracket comprises: the compression spring is arranged on the support shaft, and the small support shaft is connected with the compression spring, wherein: the large support shaft and the small support shaft are respectively contacted with the movable frame, and the compression spring generates elastic force in the axial direction of the large support shaft after being compressed, so that the stability of the support and the threaded rod in the process of transmitting to the movable frame is ensured.
2. The optical system of claim 1, wherein the beam-splitting prism is further provided with a filter set, the filter set comprising: optical filter and optical filter, wherein: the optical filter and the optical filter are respectively arranged at the light outlet hole and the light outlet hole on the prism installation chamber to filter light waves in the range of redundant wave bands.
3. The optical system according to claim 1, wherein the contact is achieved by a shaft hole structure, in particular: the movable frame is provided with a large bracket hole and a small bracket hole to be matched with the large bracket shaft and the small bracket shaft.
4. A calibration compensation method based on an optical system according to any one of claims 1-3, characterized by comprising the steps of:
step 1) dividing light into two light paths through a light splitting element, imaging the two light paths corresponding to the respective sensors respectively, calibrating and comparing a fixed picture with a movable picture through a computer, and comparing images of multiple light paths under initial multiplying power through a six-axis adjusting device to enable the movable sensor to reach an optimal position state;
step 2) fixing the movable sensor and the moving mechanism group through the dispensing mechanism, and connecting the movable sensor and the moving mechanism group to form a calibrated optical system;
step 3) respectively imaging two light paths of the calibrated optical system and the corresponding sensors thereof, and then outputting the imaged light paths and the corresponding sensors to a computer, and superposing two sensor pictures to obtain a clear image with high image quality and rich colors;
and 4) the position sensor of the optical system further detects the position of the moving frame and feeds back the position to the computer, the driving mechanism group is controlled through simulation, the high-precision movement of the moving mechanism group is realized, and the back focal value under different multiplying powers can be adjusted, so that the clear image with high image quality and rich colors under all optical design multiplying powers is realized.
5. The method of claim 4, wherein the six-axis adjustment device comprises: an X-axis direction linear moving device, a Y-axis direction linear moving device, a Z-axis direction linear moving device, an alpha-corner displacement moving device, a theta-corner displacement moving device, a beta-corner displacement moving device, a rough adjustment linear displacement device and an adsorption mechanism with an adsorption platform and a vacuum adsorption device.
6. The method according to claim 4, wherein said calibrating comprises the steps of:
1) Adjusting the displacement of the movable sensor in the X-axis direction by a coarse adjustment linear displacement device;
2) The displacement of the movable sensor in the X-axis direction is adjusted through an X-axis direction linear displacement device;
3) The displacement of the movable sensor in the Y-axis direction is adjusted through a Y-axis direction linear displacement device;
4) The displacement of the movable sensor in the Z-axis direction is adjusted through a Z-axis direction linear displacement device;
5) The angle of rotation of the movable sensor around the axis X is adjusted through an alpha rotation angle displacement device;
6) The angle of rotation of the movable sensor around the axis Y is adjusted through the theta rotation angle displacement device;
7) The angle of rotation of the movable sensor around the axis Z is adjusted by the beta-angle displacement device.
7. The method of claim 4, wherein the moving frame is provided with a moving sensing bar, the position sensor detects an initial reference position of the moving sensing bar and outputs the initial reference position to the control module, the control module obtains position parameters of the moving sensor under different multiplying powers, and then the driving mechanism group is controlled to realize accurate movement of the moving mechanism group along the optical axis direction under different multiplying powers.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810055810.5A CN108055446B (en) | 2018-01-20 | 2018-01-20 | Optical system with movable sensor for compensating back focus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810055810.5A CN108055446B (en) | 2018-01-20 | 2018-01-20 | Optical system with movable sensor for compensating back focus |
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| CN108055446A CN108055446A (en) | 2018-05-18 |
| CN108055446B true CN108055446B (en) | 2024-03-29 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109167895B (en) * | 2018-08-30 | 2021-02-02 | 浙江大华技术股份有限公司 | Rear focus adjusting device and method and camera device |
| CN112153271B (en) * | 2019-06-27 | 2022-05-20 | Oppo广东移动通信有限公司 | Control method and control device for optical lens of electronic equipment and storage medium |
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| JP2004072240A (en) * | 2002-08-02 | 2004-03-04 | Minolta Co Ltd | Imaging apparatus, and tracking system and scanner using the same |
| CN106443966A (en) * | 2016-08-29 | 2017-02-22 | 中山联合光电科技股份有限公司 | Optical lens for adjusting compensation back focal length through combination of horizontal and vertical light paths |
| CN107065139A (en) * | 2017-04-28 | 2017-08-18 | 中山联合光电科技股份有限公司 | Burnt optical system after a kind of multi-pass combination regulation compensation |
| CN107272149A (en) * | 2016-03-31 | 2017-10-20 | 索尼公司 | Optical system, electronic equipment, camera, method and computer program |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE60239034D1 (en) * | 2001-07-11 | 2011-03-10 | Konica Minolta Opto Inc | Aberration optical correction element, optical system, optical scanning device and recording and reproducing device |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2004072240A (en) * | 2002-08-02 | 2004-03-04 | Minolta Co Ltd | Imaging apparatus, and tracking system and scanner using the same |
| CN107272149A (en) * | 2016-03-31 | 2017-10-20 | 索尼公司 | Optical system, electronic equipment, camera, method and computer program |
| CN106443966A (en) * | 2016-08-29 | 2017-02-22 | 中山联合光电科技股份有限公司 | Optical lens for adjusting compensation back focal length through combination of horizontal and vertical light paths |
| CN107065139A (en) * | 2017-04-28 | 2017-08-18 | 中山联合光电科技股份有限公司 | Burnt optical system after a kind of multi-pass combination regulation compensation |
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