CN107356994A - Anti-dazzling screen and its processing method, lens assembly - Google Patents
Anti-dazzling screen and its processing method, lens assembly Download PDFInfo
- Publication number
- CN107356994A CN107356994A CN201710552667.6A CN201710552667A CN107356994A CN 107356994 A CN107356994 A CN 107356994A CN 201710552667 A CN201710552667 A CN 201710552667A CN 107356994 A CN107356994 A CN 107356994A
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- China
- Prior art keywords
- dazzling screen
- eyeglass
- black
- close
- optical axis
- Prior art date
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- 238000003672 processing method Methods 0.000 title claims abstract description 11
- 230000003287 optical effect Effects 0.000 claims abstract description 38
- 238000010041 electrostatic spinning Methods 0.000 claims description 17
- 238000001035 drying Methods 0.000 claims description 13
- 239000000853 adhesive Substances 0.000 claims description 10
- 230000001070 adhesive effect Effects 0.000 claims description 10
- 239000010410 layer Substances 0.000 claims description 10
- 238000012216 screening Methods 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 2
- 230000004313 glare Effects 0.000 abstract description 13
- 230000003313 weakening effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000013011 mating Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 230000003699 hair surface Effects 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B11/00—Filters or other obturators specially adapted for photographic purposes
- G03B11/04—Hoods or caps for eliminating unwanted light from lenses, viewfinders or focusing aids
- G03B11/043—Protective lens closures or lens caps built into cameras
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Surface Treatment Of Optical Elements (AREA)
Abstract
The present invention relates to camera field, discloses a kind of anti-dazzling screen and its processing method, lens assembly.In the present invention, anti-dazzling screen is annular in shape, including the first surface towards thing side, the second surface being oppositely arranged with first surface and the side for being connected first surface and second surface, side is included close to the 3rd surface of optical axis, second surface is provided with black tapetum, veiling glare can be weakened, so as to improve optical property.
Description
Technical field
The present invention relates to camera technical field, more particularly to anti-dazzling screen and its processing method, lens assembly.
Background technology
In recent years, with the continuous development of science and technology, electronic equipment is constantly towards intelligent development, except digital camera
Outside, portable electric appts are also provided with camera lens module such as tablet personal computer, mobile phone.In order to meet the use need of people
Will, the quality of image for the object shot to camera lens module it is also proposed higher requirement.
Camera lens module of the prior art includes lens barrel, the lens set being contained in lens barrel.It is incident from the light hole of lens barrel
Light include a part of veiling glare, camera optical property can be influenceed.
The content of the invention
The purpose of embodiment of the present invention is to provide a kind of anti-dazzling screen and its processing method, lens assembly, can weakened
Veiling glare, so as to improve optical property.
In order to solve the above technical problems, embodiments of the present invention provide a kind of anti-dazzling screen, annularly, including towards thing
The first surface of side, the second surface being oppositely arranged with first surface and the side for being connected first surface and second surface, side
Including being provided with black tapetum close to the 3rd surface of optical axis, second surface.
In addition, black tapetum is formed by electrostatic spinning.
In addition, first surface is provided with black tapetum.
In addition, the 3rd surface is provided with black tapetum.
In terms of existing technologies, anti-dazzling screen is annular in shape for embodiment of the present invention, including towards thing side first surface,
The second surface that is oppositely arranged with first surface and the side for being connected first surface and second surface, side are included close to optical axis
3rd surface, second surface are provided with black tapetum, can weaken veiling glare, so as to improve optical property.
Embodiments of the present invention additionally provide a kind of lens assembly, including the lens barrel with receiving space, are contained in
Hold the lens set in space, lens set includes the first eyeglass, the first anti-dazzling screen, the second eyeglass, the along optical axis from thing side to image side
Two anti-dazzling screens, the 3rd eyeglass, shadow shield, the 3rd anti-dazzling screen, the 4th eyeglass, pressure ring, the first anti-dazzling screen, the second anti-dazzling screen and the 3rd
At least one in anti-dazzling screen is foregoing anti-dazzling screen.
In addition, the second anti-dazzling screen is annular in shape, including with close to the upper surface of the second eyeglass, close to the lower surface of the 3rd eyeglass
With connection upper and lower surface and close to the medial surface of optical axis, lower surface is provided with black tapetum.
In addition, lower surface include close to optical axis and the lower empty avoiding face that is not abutted with the 3rd eyeglass and around lower empty avoiding face and with
The lower bearing surface that 3rd eyeglass abuts, lower empty avoiding face is provided with black tapetum.
Embodiments of the present invention additionally provide a kind of processing method of anti-dazzling screen, comprise the following steps：One screening is provided
Mating plate, annularly, including the first surface towards thing side, the second surface that is oppositely arranged with first surface and it is connected first surface
And close to the 3rd surface of optical axis, one layer of adhesive is coated on a second surface；Sprayed using electrostatic spinning equipment to second surface
Penetrate black fine hair；Dry anti-dazzling screen；The unnecessary fine hair on anti-dazzling screen surface is blown down using high pressure air pressure gun, forms one on a second surface
Layer black tapetum.
In addition, the suede amount that goes out of electrostatic spinning equipment is 0.01~1kg/min.
In addition, 2~10min of time of the drying in the step of drying anti-dazzling screen, drying temperature is 40~50 DEG C.
Brief description of the drawings
Fig. 1 is the structural representation of the anti-dazzling screen of the present invention；
Fig. 2 is the region A of the anti-dazzling screen in Fig. 1 close-up schematic view；
Fig. 3 is the structural representation of the lens assembly of the present invention；
Fig. 4 is the region B of the lens assembly in Fig. 3 close-up schematic view；
Fig. 5 is the schematic flow sheet of the processing method of the anti-dazzling screen of the present invention.
Embodiment
To make the object, technical solutions and advantages of the present invention clearer, each reality below in conjunction with accompanying drawing to the present invention
The mode of applying is explained in detail.However, it will be understood by those skilled in the art that in each embodiment of the present invention,
In order that reader more fully understands the application and proposes many ins and outs.But even if without these ins and outs and base
Many variations and modification in following embodiment, the application technical scheme claimed can also be realized.
The present invention relates to a kind of anti-dazzling screen.As shown in Figure 1-2, anti-dazzling screen 100 is annular in shape for concrete structure, including towards thing side
First surface 101, the second surface 102 that is oppositely arranged with first surface 101 and be connected first surface 101 and second surface
102 side 103, side 103 includes close to the 3rd surface 1031 of optical axis 104 and the 4th surface away from optical axis 104
1032, second surface 102 is provided with black tapetum.Black tapetum can make the light being reflected on corresponding anti-dazzling screen 100
Absorbed or broken up, luminous energy weakens, and so as to reach the purpose for weakening veiling glare, and can improve optical property.
In embodiments of the present invention, black tapetum is formed by electrostatic spinning.Specifically, electrostatic spinning is profit
With electric charge identical charges repel each other the physical characteristic that there is a natural attraction between the sexes, make negative electrical charge on fine hair band, be placed on the second surface 102 of flocking is needed
Under zero potential or grounding requirement, by the attraction of the second surface 102 of different current potential, perpendicular shape accelerates to ascend to heaven to needing to plant fine hair
On the second surface 102 of suede.Black tapetum also is provided with the surface 1031 of first surface 101 and the 3rd of anti-dazzling screen 100.Such as
This so that the light corresponding to being reflected on the surface 1031 of first surface 101 and the 3rd is absorbed or broken up, and luminous energy further subtracts
It is weak, so as to reach the purpose for weakening veiling glare, and it can further improve optical property.
In terms of existing technologies, anti-dazzling screen 10 is annular in shape, including the first table towards thing side for embodiment of the present invention
Face 101, the second surface 102 being oppositely arranged with first surface 101 and the side for being connected first surface 101 and second surface 102
103, side 103 includes being provided with what is formed by electrostatic spinning close to the 3rd surface 1031 of optical axis 104, second surface 102
Black tapetum, veiling glare can be weakened, so as to improve optical property.
The invention further relates to a kind of lens assembly, and as shown in Figure 3-4, lens assembly 10 includes the lens barrel with receiving space
11st, the lens set 12 being contained in receiving space.Lens set 12 includes the first eyeglass 121, the along optical axis 104 from thing side to image side
One anti-dazzling screen 122, the second eyeglass 123, the second anti-dazzling screen 124, the 3rd eyeglass 125, shadow shield 126, the 3rd anti-dazzling screen 127,
Four eyeglasses 128, pressure ring 129.At least one in first anti-dazzling screen 122, the second anti-dazzling screen 124 and the 3rd anti-dazzling screen 126 is such as this
Anti-dazzling screen 100 in invention first embodiment.That is in the first anti-dazzling screen 122, the second anti-dazzling screen 124 and the 3rd anti-dazzling screen 126
At least one second surface be provided with by electrostatic spinning formation black tapetum, the light for making to be reflected in thereon absorbed or
Break up, luminous energy weakens, and so as to reach the purpose for weakening veiling glare, and can improve optical property.
In embodiments of the present invention, the first anti-dazzling screen 122 is clamped between the first eyeglass 121 and the second eyeglass 123, the
Two anti-dazzling screens 124 are clamped between the second eyeglass 123 and the 3rd eyeglass 125, and the anti-dazzling screen 127 of shadow shield 126 and the 3rd is clamped in
Between 3rd eyeglass 125 and the 4th eyeglass 128, and the 3rd anti-dazzling screen 127 is located between the eyeglass 128 of shadow shield 126 and the 4th, pressure
Ring 129 is located at the image side of the 4th eyeglass 128 and is used to against, pressure ring 129 fix the 4th eyeglass 128 with the 4th eyeglass 128, and then
Can be with fixing len group 12.
In embodiments of the present invention, as shown in figure 4, the second anti-dazzling screen 124 is annular in shape, including with close to the second eyeglass
123 upper surface 1241, the lower surface 1242 of close 3rd eyeglass 125 and connection upper surface 1241 and lower surface and close optical axis
104 medial surface 1243, lower surface 1242 are provided with black tapetum.
More specifically, lower surface 1242 includes close optical axis 104 and the lower empty avoiding face 1244 not abutted with the 3rd eyeglass 125
With around lower empty avoiding face 1244 and the lower bearing surface 1247 that is abutted with the 3rd eyeglass 125, lower empty avoiding face 1244 is provided with black suede
Batt.
In embodiments of the present invention, with further reference to Fig. 4, upper surface 1241 includes close to optical axis 104 and not with second
Upper empty avoiding face 1246 that eyeglass 123 abuts and around upper empty avoiding face 1246 and the upper bearing surface 1245 that is abutted with the second eyeglass 123.
Upper empty avoiding face 1246 is provided with black tapetum so that the light being reflected on empty avoiding face 1246 is absorbed or broken up, and luminous energy enters
One step weakens, and so as to reach the purpose for weakening veiling glare, and can further improve optical property.
In embodiments of the present invention, can also be set on the side 1243 of the side of close optical axis 104 of the second anti-dazzling screen 124
There is black tapetum, further to weaken veiling glare, improve optical property.
In embodiments of the present invention, the first anti-dazzling screen 122 and the 3rd anti-dazzling screen 126 can also have and the second anti-dazzling screen
124 similar structures, further to weaken veiling glare, improve optical property, will not be repeated here.
Lens assembly 10 also includes the image side for being sequentially arranged in lens set 12 and optical filter 13, support outside receiving space
14 and sensor 15.Spacer support frame is arranged at the underface of lens barrel 11, optical filter 13 be arranged on support 14 towards the one of thing side
Face, sensor 15 are arranged on the one side of the close image side of support 14.Sensor 15 can be light sensor, to incident thereon
Light sensed to be further processed.
The invention further relates to a kind of processing method of anti-dazzling screen.As shown in figure 5, comprise the following steps：
Step S10：One anti-dazzling screen 100 is provided, annularly, including first surface 101 and first surface towards thing side
3rd surface 103 of 101 second surfaces 102 being oppositely arranged and connection first surface 101 and close optical axis, in second surface
One layer of adhesive is coated on 102.
Specifically, second surface 102 close optical axis 104 and do not abutted with the eyeglass positioned at the image side of anti-dazzling screen 100
One layer of adhesive is coated on lower empty avoiding face.Wherein, adhesive is used to paste black fine hair in follow-up electrostatic spinning.Electrostatic is planted
Suede is using electric charge identical charges repel each other the physical characteristic that there is a natural attraction between the sexes, makes negative electrical charge on fine hair band, is placed on the object of flocking is needed
Under zero potential or grounding requirement, fine hair is attracted by different current potential by plant, and perpendicular shape accelerates to ascend to heaven to needing flocking
On body surface.Due to by plant, i.e. second surface 102, above scribbling adhesive, fine hair is just vertically bonded at second surface
On 102.
In embodiments of the present invention, one layer is coated also on the surface 103 of first surface 101 and the 3rd of anti-dazzling screen 100
Adhesive.
Step S11：Using electrostatic spinning equipment black fine hair is sprayed to second surface 102.
Specifically, electrostatic spinning equipment includes a shower nozzle, before black fine hair is sprayed, makes the black suede being located in shower nozzle
Hair-videotape negative electrical charge, mobile shower nozzle close to second surface 102, in the presence of high voltage electric field from shower nozzle ascend to heaven to the second table by fine hair
Face 102, perpendicular shape are implanted on the second surface 102 for scribbling adhesive.
The suede amount that goes out of electrostatic spinning equipment is 0.01~1kg/min, it is ensured that adhesive normally pastes black fine hair.It is excellent
Choosing, the suede amount that goes out of the electrostatic spinning equipment is 0.1kg/min, and in other embodiments, electrostatic spinning equipment goes out suede amount
It can also adjust as needed.In embodiments of the present invention, accordingly, in step s 11, using electrostatic spinning equipment to screening
Also black fine hair is sprayed in the surface 103 of first surface 101 and the 3rd of mating plate.
Step S12：Dry anti-dazzling screen 100.
In step s 12,2~10min of time of drying, drying temperature are 40~50 DEG C, can so be ensured normal
Fine hair will not be damaged while drying fine hair, fine hair is made to be reflected in the light on corresponding surface and is absorbed or broken up.Preferably,
The time of drying is 6min, and drying temperature is 45 DEG C, and in other embodiments, the time of drying, drying temperature can also bases
Need to adjust.
Step S13：The unnecessary fine hair on the surface of anti-dazzling screen 100 is blown down using high pressure air pressure gun, one is formed on second surface 102
Layer black tapetum.
In previous step, there is part fine hair to be not fully locked on anti-dazzling screen 100, or be adhered to other fine hair
Surface, if do not removed, it can be come off in assembling procedure, anti-dazzling screen 100 and other elements are polluted.
Specifically, after the unnecessary fine hair on the surface of anti-dazzling screen 100 being blown down using high pressure air pressure gun, in the close of second surface 102
Optical axis 104 and not with the lower empty avoiding face that the eyeglass of the image side of anti-dazzling screen 100 abuts formed one layer of black tapetum.Black suede
The light that batt can make to be reflected on second surface 102 is absorbed or broken up, and luminous energy weakens, so as to reach the mesh for weakening veiling glare
, so as to improve optical property.
In step s 13, accordingly, can also be the after the unnecessary fine hair of shading plate surface being blown down using high pressure air pressure gun
One layer of black tapetum is formed on one surface 101 and the 3rd surface 103.For first surface 101, specifically, in first surface
101 close optical axis and not with the upper empty avoiding face that the eyeglass of the thing side of anti-dazzling screen 100 abuts coat one layer of adhesive.At this
In invention embodiment, the black tapetum formed on the surface 103 of first surface 101 and the 3rd can make to be reflected in first surface
101 and the 3rd light on surface 103 absorbed or broken up, luminous energy further weakens, so as to reach the mesh for further weakening veiling glare
, so as to improve optical property.
The step of various methods divide above, be intended merely to describe it is clear, can be merged into when realizing a step or
Some steps are split, are decomposed into multiple steps, as long as including identical logical relation, all protection domain in this patent
It is interior；To either adding inessential modification in algorithm in flow or introducing inessential design, but its algorithm is not changed
Core design with flow is all in the protection domain of the patent.
It is seen that present embodiment is the system embodiment corresponding with first embodiment, present embodiment can be with
First embodiment is worked in coordination implementation.The relevant technical details mentioned in first embodiment still have in the present embodiment
Effect, in order to reduce repetition, is repeated no more here.Correspondingly, the relevant technical details mentioned in present embodiment are also applicable in
In first embodiment.
It will be understood by those skilled in the art that the respective embodiments described above are to realize the specific embodiment of the present invention,
And in actual applications, can to it, various changes can be made in the form and details, without departing from the spirit and scope of the present invention.
Claims (10)
1. a kind of anti-dazzling screen, annularly, including the second table being oppositely arranged towards the first surface of thing side and the first surface
Face and the side of the connection first surface and the second surface, the side are included close to the 3rd surface of optical axis, and it is special
Sign is that the second surface is provided with black tapetum.
2. anti-dazzling screen according to claim 1, it is characterised in that the black tapetum is formed by electrostatic spinning
's.
3. anti-dazzling screen according to claim 1, it is characterised in that the first surface is provided with the black tapetum.
4. anti-dazzling screen according to claim 3, it is characterised in that the 3rd surface is provided with the black tapetum.
5. a kind of lens assembly, including the lens barrel with receiving space, the lens set that is contained in the receiving space, the mirror
Piece group includes the first eyeglass, the first anti-dazzling screen, the second eyeglass, the second anti-dazzling screen, the 3rd eyeglass, screening along optical axis from thing side to image side
Tabula rasa, the 3rd anti-dazzling screen, the 4th eyeglass, pressure ring, in first anti-dazzling screen, second anti-dazzling screen and the 3rd anti-dazzling screen
At least one anti-dazzling screen for as described in any one claim in claim 1-4.
6. lens assembly according to claim 5, it is characterised in that second anti-dazzling screen is annular in shape, including with it is close
The upper surface of second eyeglass, the lower surface of close 3rd eyeglass and the connection upper surface and the lower surface are simultaneously leaned on
The medial surface of dipped beam axle, the lower surface are provided with the black tapetum.
7. lens assembly according to claim 6, it is characterised in that the lower surface include close to optical axis and not with it is described
Lower empty avoiding face that 3rd eyeglass abuts and around the lower empty avoiding face and the lower bearing surface that is abutted with the 3rd eyeglass, under described
Empty avoiding face is provided with the black tapetum.
8. a kind of processing method of anti-dazzling screen, it is characterised in that comprise the following steps：
One anti-dazzling screen is provided, annularly, including second be oppositely arranged towards the first surface of thing side and the first surface
Surface and the 3rd surface of the connection first surface and close optical axis, coat one layer of adhesive on the second surface；
Using electrostatic spinning equipment black fine hair is sprayed to the second surface；
Dry the anti-dazzling screen；
The unnecessary fine hair on the anti-dazzling screen surface is blown down using high pressure air pressure gun, one layer of black fine hair is formed on the second surface
Layer.
9. the processing method of anti-dazzling screen according to claim 8, it is characterised in that the electrostatic spinning equipment goes out suede amount
For 0.01~1kg/min.
10. the processing method of anti-dazzling screen according to claim 8, it is characterised in that the step of the drying anti-dazzling screen
2~10min of time of drying in rapid, drying temperature are 40~50 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710552667.6A CN107356994A (en) | 2017-07-07 | 2017-07-07 | Anti-dazzling screen and its processing method, lens assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710552667.6A CN107356994A (en) | 2017-07-07 | 2017-07-07 | Anti-dazzling screen and its processing method, lens assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107356994A true CN107356994A (en) | 2017-11-17 |
Family
ID=60291860
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710552667.6A Pending CN107356994A (en) | 2017-07-07 | 2017-07-07 | Anti-dazzling screen and its processing method, lens assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107356994A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12429634B2 (en) | 2021-12-29 | 2025-09-30 | Largan Precision Co., Ltd. | Imaging lens, light blocking sheet and electronic device |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61113043A (en) * | 1984-11-08 | 1986-05-30 | Konishiroku Photo Ind Co Ltd | Light shielding device of collapsible barrel type camera |
| CN101639558A (en) * | 2008-07-31 | 2010-02-03 | 比亚迪股份有限公司 | Lens, method for removing lens flare and die for manufacturing lens barrel |
| CN101886448A (en) * | 2010-07-15 | 2010-11-17 | 无锡新大中薄板有限公司 | A kind of manufacturing method of flocking hot-dip galvanized sheet material |
| CN102621771A (en) * | 2011-01-27 | 2012-08-01 | 鸿富锦精密工业（深圳）有限公司 | Shading film and camera module using the same |
| CN103852851A (en) * | 2012-12-06 | 2014-06-11 | 玉晶光电(厦门)有限公司 | Imaging lens capable of eliminating stray light |
| CN203981945U (en) * | 2014-06-13 | 2014-12-03 | 大立光电股份有限公司 | Shading sheet, optical lens set and mobile device |
-
2017
- 2017-07-07 CN CN201710552667.6A patent/CN107356994A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61113043A (en) * | 1984-11-08 | 1986-05-30 | Konishiroku Photo Ind Co Ltd | Light shielding device of collapsible barrel type camera |
| CN101639558A (en) * | 2008-07-31 | 2010-02-03 | 比亚迪股份有限公司 | Lens, method for removing lens flare and die for manufacturing lens barrel |
| CN101886448A (en) * | 2010-07-15 | 2010-11-17 | 无锡新大中薄板有限公司 | A kind of manufacturing method of flocking hot-dip galvanized sheet material |
| CN102621771A (en) * | 2011-01-27 | 2012-08-01 | 鸿富锦精密工业（深圳）有限公司 | Shading film and camera module using the same |
| CN103852851A (en) * | 2012-12-06 | 2014-06-11 | 玉晶光电(厦门)有限公司 | Imaging lens capable of eliminating stray light |
| CN203981945U (en) * | 2014-06-13 | 2014-12-03 | 大立光电股份有限公司 | Shading sheet, optical lens set and mobile device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US12429634B2 (en) | 2021-12-29 | 2025-09-30 | Largan Precision Co., Ltd. | Imaging lens, light blocking sheet and electronic device |
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