CN105137697A - Electromagnetic aperture apparatus with large caliber and thin thickness - Google Patents

Electromagnetic aperture apparatus with large caliber and thin thickness Download PDF

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Publication number
CN105137697A
CN105137697A CN201510599087.3A CN201510599087A CN105137697A CN 105137697 A CN105137697 A CN 105137697A CN 201510599087 A CN201510599087 A CN 201510599087A CN 105137697 A CN105137697 A CN 105137697A
Authority
CN
China
Prior art keywords
driving lever
coil
drive
hole
base
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201510599087.3A
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Chinese (zh)
Inventor
黄振锋
梁海清
刘辉
周江威
蔡宾
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Union Optech Co Ltd
Original Assignee
Union Optech Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Union Optech Co Ltd filed Critical Union Optech Co Ltd
Priority to CN201510599087.3A priority Critical patent/CN105137697A/en
Publication of CN105137697A publication Critical patent/CN105137697A/en
Pending legal-status Critical Current

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    • GPHYSICS
    • G03PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03BAPPARATUS 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
    • G03B9/00Exposure-making shutters; Diaphragms
    • G03B9/02Diaphragms
    • G03B9/04Single movable plate with two or more apertures of graded size, e.g. sliding plate or pivoting plate

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Diaphragms For Cameras (AREA)

Abstract

The invention discloses an electromagnetic aperture apparatus with large caliber and thin thickness. The electromagnetic aperture apparatus comprises a base, the base is provided with an aperture hole for forming an optical path, and the base is also provided with two blades capable of sliding along opposite directions in order to change the size of the aperture hole and a shifting rod for driving the two blades to slide along the opposite directions via rotation. According to the technical scheme, the electromagnetic aperture apparatus is characterized in that the base is also provided with a shifting rod driving device capable of driving the shifting rod to rotate, and the shifting rod driving device comprises a magnet fixedly connected with the shifting rod and a coil rack wound with coils and capable of driving the magnet to rotate in order to drive the shifting rod to rotate. According to the electromagnetic aperture apparatus, two coils interact with each other to drive the shifting rod to rotate so that the two blades are driven to slide along the opposite directions so as to adjust the size of the aperture hole, a motor and a gear transmission mechanism are omitted, the structure is simple, and the electromagnetic aperture apparatus is applicable to aperture structures with large caliber and small space.

Description

The electromagnetic type iris apparatus that a kind of bore is large, thickness is thin
[technical field]
The invention belongs to field of optical equipment, specifically relate to the electromagnetic type iris apparatus that a kind of bore is large, thickness is thin.
[background technology]
In the aperture system field of monitoring camera, along with deepening continuously of application, iris apparatus type of service tends to heavy caliber and ultrathin development gradually, so just can more, more effectively control light therethrough camera lens, thus reach the logical light quantity controlling camera lens, ensure that the drawing that camera lens presents is optimum.Heavy caliber iris apparatus, under the controlled prerequisite meeting small-bore aperture, more can control by more light therethrough camera lens; Space after the lower thickness of device for mechanical structure between the more effective guarantee lens wearer of energy.But especially electromagnetic type iris apparatus is also rarely found for heavy caliber and extra-thin iris apparatus in the market.
The present invention makes in view of the situation.
[summary of the invention]
The present invention seeks to overcome the deficiencies in the prior art, provide a kind of structure simple and the electromagnetic type iris apparatus that bore is large, thickness is thin.
The present invention is achieved by the following technical solutions:
A kind of bore is large, the electromagnetic type iris apparatus that thickness is thin, include base 1, described base 1 is provided with the diaphragm hole 2 forming light path, described base 1 is also provided with two blades 3 that can slide to change diaphragm hole 2 size in opposite direction and by from then the driving lever 4 that slides in opposite direction of drive two blades 3, it is characterized in that: described base 1 is also provided with the driving lever drive unit 5 that described driving lever 4 can be driven to rotate, described driving lever drive unit 5 includes the magnetite 7 be fixedly connected with described driving lever 4, be tied with coil make it possible to drive the rotation of described magnetite 7 thus drive the coil former 6 that described driving lever 4 rotates.
The electromagnetic type iris apparatus that bore described above is large, thickness is thin, it is characterized in that: described magnetite 7 be enclosed within to coordinate on described driving lever 4 and with driving lever 4 outer wall fixing, the axle center hole of described driving lever 4 is inserted with the locating shaft 8 that together can rotate to reduce with described driving lever 4, magnetite 7 rotation friction, and the inner top of described coil former 6 is provided with the pilot hole 9 for locating described locating shaft 8.
The electromagnetic type iris apparatus that bore described above is large, thickness is thin, it is characterized in that: described coil former 6 comprises the drive coil installation portion 601 for being wound around drive coil and the system for being wound around the imperial coil of system drives coil installation portion 602, described coil former 6 is also provided with multiple aperture 603, and described aperture 603 interpolation has the splicing ear 10 for being connected with external circuit by imperial to described drive coil and system coil.
The electromagnetic type iris apparatus that bore described above is large, thickness is thin, it is characterized in that: be respectively equipped with board in circuit board slot 604, Hall element slot 605 and magnetic post slot 606 at described coil former 6 outer wall, be inserted with flexible PCB, the Hall element 11 be electrically connected with flexible PCB in described board in circuit board slot 604, Hall element slot 605, magnetic post slot 606 respectively and described diaphragm hole 2 can be made when no power to be in the permanent magnetism pillar 12 of closed condition.
The electromagnetic type iris apparatus that bore described above is large, thickness is thin, it is characterized in that: described base 1 is integrally formed with mount pad 101, described driving lever 4 and driving lever drive unit 5 are located on described mount pad 101, described mount pad 101 is snapped with the two pieces of baffle plates 14 arranged in opposite directions, the semicircular indentations that two pieces of baffle plates 14 are provided with forms circular mounting hole 15 when arranging in opposite directions, described magnetite 7 and coil former 6 to be located in described mounting hole 15 and to stretch out mounting hole 15, and described mounting hole 15 passing hole inwall card has the bell housing 16 be enclosed within described coil former 6.
The electromagnetic type iris apparatus that bore described above is large, thickness is thin, it is characterized in that: described coil former 6 covers on described magnetite 7, be provided with snapping bottom described coil former 6 and be fixed on button pin 607 in described baffle plate 14, go back buckle in described base 1 to have and the coil cap 13 coordinated bottom described coil former 6, described coil cap 13 is also provided with the described pilot hole 9 for locating described locating shaft 8.
The electromagnetic type iris apparatus that bore described above is large, thickness is thin, it is characterized in that: described driving lever 4 comprises the drive pin 402 that the central authorities be fixed with described magnetite 7 inwall engage round platform 401 and are located at two ends, described base 1 is provided with and inserts arcuate socket 21 for limiting described driving lever 4 rotational angle for described drive pin 402, two described blades 3 are provided with and insert again to make two described blades 3 make the bar hole 17 of reverse motions for two drive pins 402 after described arcuate socket 21 stretches out.
The electromagnetic type iris apparatus that bore described above is large, thickness is thin, is characterized in that: on described base 1, be provided with the base rail 18 for reducing friction when described blade 3 moves.
The electromagnetic type iris apparatus that bore described above is large, thickness is thin, is characterized in that: the lateral edges of two described blades 3 is equipped with pilot hole 19, and on described base 1, the corresponding blade inserting described blade 3 slip of restriction in described pilot hole 19 that is provided with links up with 20.
Compared with prior art, the present invention has the following advantages:
1, the present invention is interacted by two coils and drives driving levers to rotate thus drive two blades to slide the size regulating diaphragm hole in opposite direction, and eliminate motor and gear drive, structure is simple, is applicable to the iris diaphragm structure that heavy caliber, space are little.
2, the present invention is provided with locating shaft, instead of driving lever and magnetite is directly placed on base, decreases contact area thus greatly reduces rotation friction.
[accompanying drawing explanation]
Fig. 1 is stereographic map 1 of the present invention;
Fig. 2 is stereographic map 2 of the present invention;
Fig. 3 is cut-open view of the present invention;
Fig. 4 is explosive view of the present invention;
Fig. 5 is the planimetric map under diaphragm hole full-gear of the present invention;
Fig. 6 is the planimetric map under diaphragm hole full off state of the present invention;
Fig. 7 is the stereographic map 1 of coil former of the present invention;
Fig. 8 is the stereographic map 2 of coil former of the present invention;
Fig. 9 is the stereographic map of coil cap of the present invention;
Figure 10 is the stereographic map of magnetite of the present invention;
Figure 11 is the stereographic map of driving lever of the present invention;
Figure 12 is the stereographic map of Hall element of the present invention.
In figure: 1 is base; 101 is mount pad; 2 is diaphragm hole; 3 is blade; 4 is driving lever; 401 is central authorities' engaging round platforms; 402 is drive pin; 5 is driving lever drive unit; 6 is coil former; 601 is drive coil installation portion; 602 is the imperial coil installation portion of system; 603 is aperture; 604 is board in circuit board slot; 605 is Hall element slot; 606 is magnetic post slot; 607 is button pin; 7 is magnetite; 8 is locating shaft; 9 is pilot hole; 10 is splicing ear; 11 is Hall element; 12 is permanent magnetism pillar; 13 is coil cap; 14 is baffle plate; 15 is mounting hole; 16 is bell housing; 17 is bar hole; 18 is base rail; 19 is pilot hole; 20 is blade hook; 21 is arcuate socket; 22 is lock pair hole.
[embodiment]
Below in conjunction with accompanying drawing, the technology of the present invention feature is described in further detail so that described those skilled in the art understand.
A kind of bore is large, the electromagnetic type iris apparatus that thickness is thin, as shown in Figures 1 to 12, include base 1, described base 1 is provided with the diaphragm hole 2 forming light path, described base 1 is also provided with two blades 3 that can slide to change diaphragm hole 2 size in opposite direction and by from then the driving lever 4 that slides in opposite direction of drive two blades 3, described base 1 is also provided with the driving lever drive unit 5 that described driving lever 4 can be driven to rotate, described driving lever drive unit 5 includes the magnetite 7 be fixedly connected with described driving lever 4, be tied with coil make it possible to drive the rotation of described magnetite 7 thus drive the coil former 6 that described driving lever 4 rotates.Total is paid hole 22 by lock and is fixed in camera lens group.
This device is mainly rotated by the rotating drive driving lever 4 of magnetite 7, is driven the start back and forth of two blades by the rotation of driving lever 4.The different pivot angle of driving lever 4 and aperture area be changing into direct relation, using driving lever 4 horizontal direction as 0 °, when driving lever 4 and the angle of horizontal direction are 31.0 °, aperture is in full off state, as shown in Figure 6; When driving lever 4 and the angle of horizontal direction are-31.0 °, aperture is in opening, as shown in Figure 5.When needing the clear aperture of different size, respond to the different angles of driving lever 4 and horizontal direction mainly through Hall element 11, the different Voltage Feedback of corresponding output controls the size of aperture switch, thus when light is weak, open large clear aperture, when light is strong, open little clear aperture.
Further, described magnetite 7 be enclosed within to coordinate on described driving lever 4 and with driving lever 4 outer wall fixing, the axle center hole of described driving lever 4 is inserted with the locating shaft 8 that together can rotate to reduce with described driving lever 4, magnetite 7 rotation friction, and the inner top of described coil former 6 is provided with the pilot hole 9 for locating described locating shaft 8.The setting of locating shaft 8 decreases the contact area with base 1, thus decreases rotation friction, has the effect of location concurrently simultaneously.Bore is large, thickness is thin to adopt the aperture of drive unit of the present invention really to realize, and aperture of the present invention not only maximum logical light mouth diameter can reach ∮ 18.1mm, and thickness is thin, and the operation thickness that need take only has 1.84mm.Design length is about 52.9mm, width 37.7mm.Leading portion operation thickness is 1.84mm, is applicable to the iris diaphragm structure that heavy caliber, space are little.
Be respectively equipped with board in circuit board slot 604, Hall element slot 605 and magnetic post slot 606 in described coil former 6 outer wall circumference, be inserted with flexible PCB (not shown), the Hall element 11 be electrically connected with flexible PCB in described board in circuit board slot 604, Hall element slot 605, magnetic post slot 606 respectively and described diaphragm hole 2 can be made when no power to be in the permanent magnetism pillar 12 of closed condition.
Described coil former 6 comprises the drive coil installation portion 601 for being wound around drive coil and the system for being wound around the imperial coil of system drives coil installation portion 602, described drive coil installation portion 601 and the imperial coil installation portion 602 of system are equipped with the ring groove for winding around, the side of close Hall element slot 605 is drive coil installation portion 601, described coil former 6 is also provided with multiple aperture 603, and described aperture 603 interpolation has the splicing ear 10 for being connected with external circuit by imperial to drive coil and system coil.Two coils are coupled together by four splicing ears 10.
Described base 1 is integrally formed with mount pad 101, described driving lever 4 and driving lever drive unit 5 are located on described mount pad 101, described mount pad 101 is snapped with the two pieces of baffle plates 14 arranged in opposite directions, the semicircular indentations that two pieces of baffle plates 14 are provided with forms circular mounting hole 15 when arranging in opposite directions, described magnetite 7 and coil former 6 to be located in described mounting hole 15 and to stretch out mounting hole 15, and described mounting hole 15 passing hole inwall card has the bell housing 16 be enclosed within described coil former 6.
Described coil former 6 covers on described magnetite 7, be provided with snapping bottom described coil former 6 and be fixed on button pin 607 in described baffle plate 14, go back buckle in described base 1 to have and the coil cap 13 coordinated bottom described coil former 6, described coil cap 13 is also provided with the described pilot hole 9 for locating described locating shaft 8.The upper and lower side of locating shaft 8 is positioned in the pilot hole 9 of coil former 6 and coil cap 13 respectively, as shown in Figure 3.
Described driving lever 4 comprises the drive pin 402 that the central authorities be fixed with described magnetite 7 inwall engage round platform 401 and are located at two ends, described base 1 is provided with and inserts arcuate socket 21 for limiting described driving lever 4 rotational angle for described drive pin 402, two described blades 3 are provided with and insert again to make two described blades 3 make the bar hole 17 of reverse motions for two drive pins 402 after described arcuate socket 21 stretches out.
Described base 1 is also provided with the base rail 18 for reducing friction when described blade 3 moves.
The lateral edges of two described blades 3 is equipped with pilot hole 19, and on described base 1, the corresponding blade inserting described blade 3 slip of restriction in described pilot hole 19 that is provided with links up with 20.
Principle of work of the present invention is: power supply connects drive coil and the imperial coil of system by splicing ear 10 again by flexible PCB, when accessing current signal, drive coil produces magnetic field, magnetic field is in corresponding formation S pole, coil former 6 two ends and N pole, and change polarity with the change of current signal, permanent magnet magnetite 7 is by two like magnetic poles repel each other, the principle that there is a natural attraction between the sexes, permanent magnet magnetite 7 is changed and corresponding rotation with current signal, and in like manner the imperial permanent magnet magnetite 7 of the imperial end-coil access current signal time system of system changes with current signal and rotates.Acting force due to drive coil is greater than the reacting force of the imperial coil of system, and then drive driving lever 4 slowly to rotate, then act on the bar hole 17 on two blades 3 by the drive pin 402 at two ends on driving lever 4, make the closed slip of two blade 3 switches, thus present the diaphragm hole 2 of different size, to control different light sizes through the diaphragm hole 2 on base 1.Meanwhile, Hall element 11 responds to the different pivot angles of driving lever 4 and magnetite 7, exports corresponding feedback voltage signal, thus controls the aperture bore of different size.In addition, the effect of permanent magnetism pillar 12 is exactly make permanent magnet magnetite 7 fixedly turn to side under cold state by the acting force in magnetic field, thus aperture is in closed condition under cold condition.
Below embodiment is to invention has been detailed description by reference to the accompanying drawings, and those skilled in the art can make many variations example to the present invention according to the above description.Thus, some details in embodiment should not form limitation of the invention, the present invention by the scope that defines using appended claims as protection scope of the present invention.

Claims (9)

1. a bore is large, the electromagnetic type iris apparatus that thickness is thin, include base (1), described base (1) is provided with the diaphragm hole (2) forming light path, described base (1) is also provided with two blades (3) that can slide to change diaphragm hole (2) size in opposite direction and by from then the driving lever (4) that slides in opposite direction of drive two blades (3), it is characterized in that: described base (1) is also provided with the driving lever drive unit (5) that described driving lever (4) can be driven to rotate, described driving lever drive unit (5) includes the magnetite (7) be fixedly connected with described driving lever (4), be tied with coil to make it possible to drive (7) rotation of described magnetite thus the coil former (6) driving described driving lever (4) to rotate.
2. the electromagnetic type iris apparatus that bore is large according to claim 1, thickness is thin, it is characterized in that: described magnetite (7) is enclosed within described driving lever (4) and goes up and coordinate with driving lever (4) outer wall fixing, the axle center hole of described driving lever (4) is inserted with the locating shaft (8) that together can rotate to reduce with described driving lever (4), magnetite (7) rotation friction, and the inner top of described coil former (6) is provided with the pilot hole (9) for locating described locating shaft (8).
3. the electromagnetic type iris apparatus that bore is large according to claim 1, thickness is thin, it is characterized in that: described coil former (6) comprises the drive coil installation portion (601) for being wound around drive coil and the system for being wound around the imperial coil of system drives coil installation portion (602), described coil former (6) is also provided with multiple aperture (603), and described aperture (603) interpolation has the splicing ear (10) for being connected with external circuit by imperial to described drive coil and system coil.
4. the electromagnetic type iris apparatus that bore is large according to claim 2, thickness is thin, it is characterized in that: be respectively equipped with board in circuit board slot (604), Hall element slot (605) and magnetic post slot (606) at described coil former (6) outer wall, be inserted with flexible PCB, the Hall element (11) be electrically connected with flexible PCB in described board in circuit board slot (604), Hall element slot (605), magnetic post slot (606) respectively and described diaphragm hole (2) can be made when no power to be in the permanent magnetism pillar (12) of closed condition.
5. bore is large according to claim 2, the electromagnetic type iris apparatus that thickness is thin, it is characterized in that: described base (1) is integrally formed with mount pad (101), described driving lever (4) and driving lever drive unit (5) are located on described mount pad (101), described mount pad (101) is snapped with the two pieces of baffle plates (14) arranged in opposite directions, the semicircular indentations that two pieces of baffle plates (14) are provided with forms circular mounting hole (15) when arranging in opposite directions, described magnetite (7) and coil former (6) to be located in described mounting hole (15) and to stretch out mounting hole (15), described mounting hole (15) passing hole inwall card has the bell housing (16) be enclosed within described coil former (6).
6. the electromagnetic type iris apparatus that bore is large according to claim 5, thickness is thin, it is characterized in that: described coil former (6) covers on described magnetite (7), described coil former (6) bottom is provided with snapping and is fixed on button pin (607) in described baffle plate (14), go back buckle in described base (1) and have the coil cap (13) coordinated with described coil former (6) bottom, described coil cap (13) is also provided with the described pilot hole (9) for locating described locating shaft (8).
7. bore is large according to claim 2, the electromagnetic type iris apparatus that thickness is thin, it is characterized in that: described driving lever (4) comprises the drive pin (402) that the central authorities be fixed with described magnetite (7) inwall engage round platform (401) and are located at two ends, described base (1) is provided with for the arcuate socket (21) of described drive pin (402) insertion for limiting described driving lever (4) rotational angle, two described blades (3) are provided with and insert again to make two described blades (3) make the bar hole (17) of reverse motions for two drive pins (402) after described arcuate socket (21) stretches out.
8. the electromagnetic type iris apparatus that bore is large according to claim 1, thickness is thin, is characterized in that: the base rail (18) rubbed when being provided with on described base (1) for reducing described blade (3) motion.
9. the electromagnetic type iris apparatus that bore is large according to claim 1, thickness is thin, it is characterized in that: the lateral edges of two described blades (3) is equipped with pilot hole (19), upper corresponding being provided with of described base (1) inserts interior blade hook (20) limiting described blade (3) and slide of described pilot hole (19).
CN201510599087.3A 2015-09-18 2015-09-18 Electromagnetic aperture apparatus with large caliber and thin thickness Pending CN105137697A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107167917A (en) * 2017-06-12 2017-09-15 中国科学院西安光学精密机械研究所 Rotary direct-drive electric diaphragm
CN108061994A (en) * 2017-12-27 2018-05-22 哈尔滨学院 A kind of miniature aperture drawing and pulling type adjuster for mobile phone
CN108777760A (en) * 2018-07-25 2018-11-09 宁波舜宇光电信息有限公司 Iris ring structure, camera module and electronic equipment
CN110260768A (en) * 2019-06-21 2019-09-20 安徽南氟化工设备有限公司 A kind of port flatness checking device of emergency cut-off gate valve
CN110375627A (en) * 2019-08-26 2019-10-25 付国军 A kind of flatness detection device

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JP2004350409A (en) * 2003-05-22 2004-12-09 Ps Tokki Hanbai Kk Motor
CN1831633A (en) * 2005-03-10 2006-09-13 尼司卡股份有限公司 Light amount adjusting device and projector using the same
JP2012047991A (en) * 2010-08-27 2012-03-08 New Asia Optical Corp Drive motor and light quantity adjusting device
CN203532917U (en) * 2013-11-07 2014-04-09 中山联合光电科技有限公司 Super-stable electromagnetic valve switching device with super-good shielding performance
CN104133337A (en) * 2013-05-03 2014-11-05 东莞市维斗电子有限公司 Single invisible aperture
CN204964958U (en) * 2015-09-18 2016-01-13 中山联合光电科技股份有限公司 Electromagnetic type light ring device that bore is big, thickness is thin

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004350409A (en) * 2003-05-22 2004-12-09 Ps Tokki Hanbai Kk Motor
CN1831633A (en) * 2005-03-10 2006-09-13 尼司卡股份有限公司 Light amount adjusting device and projector using the same
JP2012047991A (en) * 2010-08-27 2012-03-08 New Asia Optical Corp Drive motor and light quantity adjusting device
CN104133337A (en) * 2013-05-03 2014-11-05 东莞市维斗电子有限公司 Single invisible aperture
CN203532917U (en) * 2013-11-07 2014-04-09 中山联合光电科技有限公司 Super-stable electromagnetic valve switching device with super-good shielding performance
CN204964958U (en) * 2015-09-18 2016-01-13 中山联合光电科技股份有限公司 Electromagnetic type light ring device that bore is big, thickness is thin

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107167917A (en) * 2017-06-12 2017-09-15 中国科学院西安光学精密机械研究所 Rotary direct-drive electric diaphragm
CN108061994A (en) * 2017-12-27 2018-05-22 哈尔滨学院 A kind of miniature aperture drawing and pulling type adjuster for mobile phone
CN108061994B (en) * 2017-12-27 2024-02-02 哈尔滨学院 Miniature aperture pulling type regulator for mobile phone
CN108777760A (en) * 2018-07-25 2018-11-09 宁波舜宇光电信息有限公司 Iris ring structure, camera module and electronic equipment
CN108777760B (en) * 2018-07-25 2024-05-10 宁波舜宇光电信息有限公司 Iris diaphragm structure, camera module and electronic equipment
CN110260768A (en) * 2019-06-21 2019-09-20 安徽南氟化工设备有限公司 A kind of port flatness checking device of emergency cut-off gate valve
CN110260768B (en) * 2019-06-21 2020-12-04 安徽南氟化工设备有限公司 Port flatness detection device of emergency cutoff gate valve
CN110375627A (en) * 2019-08-26 2019-10-25 付国军 A kind of flatness detection device
CN110375627B (en) * 2019-08-26 2020-12-11 无锡杰尔维科技有限公司 Flatness detection equipment

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Application publication date: 20151209