CN111007619B - Lens device and lens focusing method - Google Patents
Lens device and lens focusing method Download PDFInfo
- Publication number
- CN111007619B CN111007619B CN201811168387.6A CN201811168387A CN111007619B CN 111007619 B CN111007619 B CN 111007619B CN 201811168387 A CN201811168387 A CN 201811168387A CN 111007619 B CN111007619 B CN 111007619B
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- Prior art keywords
- ring
- lens
- hollow base
- correction
- lens group
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/022—Mountings, adjusting means, or light-tight connections, for optical elements for lenses lens and mount having complementary engagement means, e.g. screw/thread
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/025—Mountings, adjusting means, or light-tight connections, for optical elements for lenses using glue
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
Abstract
A lens device comprises a hollow base, a correction ring and a lens group. The hollow base comprises a bottom surface and an assembling plane opposite to the bottom surface, and the assembling plane is provided with a through hole. The correction ring comprises a shaft hole, a first annular surface and a second annular surface which are opposite to each other in the axial direction, an inner thread is arranged on the inner wall of the shaft hole, the shaft hole corresponds to the through hole of the hollow base, and the second annular surface is fixed on an assembly plane of the hollow base through a curing adhesive layer. The lens group comprises a lens barrel, wherein the lens barrel is provided with an external thread and screwed in an internal thread of the correcting ring through the external thread lens barrel.
Description
[ technical field ] A
The present invention relates to an optical device, and more particularly, to a lens device and a lens focusing method.
[ background of the invention ]
With the development of technology, many electronic products (such as smart phones, tablet computers, cameras or automobile recorders, etc.) are installed with lens devices for capturing images of the exterior of the electronic products.
Generally, the most important thing for a lens device is whether an acquired image is clear, and in order to achieve the above purpose, an Active Alignment (Active Alignment) focusing method is often used for focusing in manufacturing the lens device. The active calibration focusing method is mainly that a lens is firstly placed on a supporting seat, then the relative position of the lens and the supporting seat is adjusted to focus the lens, and finally the lens and the supporting seat are mutually glued and fixed. However, in this way, after the focusing is completed, if the lens still has a focus or is damaged, the lens and the supporting seat are fixed to each other, so that only the whole set of lens device can be eliminated, which increases the cost.
[ summary of the invention ]
In view of the above, in one embodiment, a lens device is provided, which includes a hollow base, a correction ring and a lens group. The hollow base comprises a bottom surface and an assembly plane opposite to the bottom surface, and the assembly plane is provided with a through hole. The correcting ring comprises a shaft hole, a first annular surface and a second annular surface which are opposite to each other in the axial direction, an inner thread is arranged on the inner wall of the shaft hole, the shaft hole corresponds to the through hole of the hollow base, and the second annular surface is fixed on an assembly plane of the hollow base through a curing glue layer. The lens group comprises a lens barrel, wherein the lens barrel is provided with an external thread, and the external thread of the lens barrel is screwed on the internal thread of the correction ring.
In one embodiment, a lens focusing method is provided, including the steps of: preparing a hollow base, a correction ring and a lens group, wherein the hollow base comprises a bottom surface and an assembly plane opposite to the bottom surface, the assembly plane is provided with a through hole, the correction ring comprises a shaft hole, a first ring surface and a second ring surface which are opposite in axial direction, the inner wall of the shaft hole is provided with an internal thread, the lens group comprises a lens barrel, the lens barrel is provided with an external thread, the lens barrel is screwed in the internal thread of the correction ring through the external thread, the shaft hole of the correction ring corresponds to the through hole of the hollow base, and the correction ring moves relative to the hollow base to be adjusted to a corrected position and is bonded on the assembly plane of the hollow base through a curing glue layer by the second ring surface; a detection step: detecting whether the corrected position enables the lens group to be located at the focusing position; a focusing step: when the lens group is not in the focusing position, rotating the lens group relative to the correction ring to axially move to the focusing position; gluing: and filling adhesive between the external thread and the internal thread to fix the lens group and the correction ring.
To sum up, the lens device and the lens focusing method according to the embodiments of the present invention are adjusted to a corrected position by the correction ring and fixed on the assembly plane of the hollow base by screwing the external thread of the lens barrel of the lens group into the internal thread of the correction ring. Therefore, when the corrected position can not enable the lens group to be located at the focusing position, the lens group can be rotated relative to the correction ring so as to move relative to the correction ring and the hollow base to adjust focusing. Or, when the lens group is damaged, the lens group can be only rotated and disassembled relative to the correcting ring to be replaced by another new lens group, thereby achieving the advantage of effectively reducing the cost without eliminating the whole lens device.
[ description of the drawings ]
Fig. 1 is a perspective view of an embodiment of a lens device according to the present invention.
Fig. 2 is an exploded perspective view of an embodiment of a lens device according to the invention.
Fig. 3 is a cross-sectional view of an embodiment of a lens device according to the present invention.
Fig. 4 is a flowchart illustrating steps of a lens focusing method according to an embodiment of the present invention.
Fig. 5 is an exploded cross-sectional view of an embodiment of a lens device according to the present invention.
Fig. 6 is a focus actuation diagram of an embodiment of a lens apparatus according to the present invention.
Fig. 7 is a diagram of gluing and fixing a lens device according to an embodiment of the present invention.
[ detailed description ] A
Fig. 1 is a perspective view of an embodiment of a lens apparatus according to the present invention, fig. 2 is an exploded perspective view of an embodiment of a lens apparatus according to the present invention, and fig. 3 is a cross-sectional view of an embodiment of a lens apparatus according to the present invention. . As shown in fig. 1 and fig. 2, in the present embodiment, the lens device 1 includes a hollow base 10, a correction ring 20, a lens group 30 and a circuit board 40. In some embodiments, the lens device 1 can be applied to an electronic product for capturing a peripheral image. For example, the lens device 1 may be an image capturing lens of an electronic product such as a smart phone, a tablet computer, a notebook computer, or a video camera.
As shown in fig. 3, the hollow base 10 is fixedly disposed on the circuit board 40, wherein the surface of the circuit board 40 is provided with the photosensitive assembly 41, and the photosensitive assembly 41 is located in the hollow base 10. In this embodiment, the hollow base 10 includes a bottom surface 11 and an assembly plane 12 opposite to the bottom surface 11, the hollow base 10 is fixedly disposed on the circuit board 40 with the bottom surface 11, the assembly plane 12 is provided with a through hole 13, the through hole 13 penetrates through to the surface of the circuit board 40, and the photosensitive element 41 is located in the through hole 13. In some embodiments, the photosensitive component 41 may be a charge-coupled device (CCD), a Complementary Metal-oxide semiconductor (CMOS), or a Complementary Metal-oxide semiconductor Active pixel sensor (CMOS), in particular.
As shown in fig. 3, the calibration ring 20 and the lens group 30 of the lens device 1 are mounted on the assembly plane 12 of the hollow base 10, and the lens group 30 is fixed at a predetermined focusing position by adjusting the distance between the calibration ring 20 and the photosensitive element 41, wherein the focusing position can maintain a predetermined imaging focal length between the lens group 30 and the photosensitive element 41 to obtain a desired image quality. The following further describes the procedure of the lens focusing method according to the embodiment of the present invention with reference to the drawings.
As shown in fig. 4, the lens focusing method of the present embodiment includes a correction step S01, a detection step S02, a focusing step S03, and a gluing step S04. Referring to fig. 2 and 5, in the calibration step S01, the hollow base 10, the calibration ring 20 and the lens set 30 are prepared, the hollow base 10 is fixed on the circuit board 40, and the assembly plane 12 of the hollow base 10 is surrounded by the light-cured adhesive layer 15 (e.g., an ultraviolet light-cured adhesive layer). The correction ring 20 comprises a shaft hole 21 and a first annular surface 22 and a second annular surface 23 which are axially opposite, and the inner wall of the shaft hole 21 is provided with an internal thread 211. The lens group 30 includes a lens barrel 31, the lens barrel 31 is provided with an external thread 311, and the lens group 30 can be screwed into the internal thread 211 of the correction ring 20 with the external thread 311 on the lens barrel 31. As shown in fig. 5, in an embodiment, the thickness of the correction ring 20 is smaller than the thickness of the lens barrel 31, and the length of the external thread 311 is larger than the length of the internal thread 211, so that the lens barrel 31 can rotate relative to the correction ring 20 and pass through the second annular surface 23, but this is not a limitation. In addition, the lens group 30 and the correction ring 20 are releasably locked to each other, for example, the lens group 30 can rotate clockwise to make the external thread 311 thread into the internal thread 211 of the correction ring 20, and when the correction ring 20 and the lens group 30 abut against each other, the lens group 30 can be forced clockwise to be locked to each other. When the calibration ring 20 and the lens set 30 need to be loosened, the lens set 30 can be rotated counterclockwise, so that the lens set 30 can be restored to a state of being rotatable relative to the calibration ring 20.
As shown in fig. 5, after the lens group 30 is screwed to the internal thread 211 of the correction ring 20 by the external thread 311 of the lens barrel 31, the second annular surface 23 of the correction ring 20 is placed on the photo-cured adhesive layer 15 of the assembly plane 12 of the hollow base 10, such that the axial hole 21 corresponds to the through hole 13 of the hollow base 10. The aperture of the shaft hole 21 can be smaller than the aperture of the through hole 13, and the lens barrel 31 constituting the lens group 30 can penetrate into the through hole 13 and corresponds to the photosensitive element 41 on the circuit board 40. Then, the correcting ring 20 is moved and adjusted to a corrected position relative to the hollow base 10, so that the lens set 30 and the photosensitive element 41 are kept at a predetermined imaging focal length. In detail, since the light-cured adhesive layer 15 is not irradiated by light and is not cured, the calibration ring 20 can still move relative to the hollow base 10 to adjust the position after being placed on the light-cured adhesive layer 15. For example, a robot arm (not shown) can be used to hold the calibration ring 20 or the lens group 30 and perform actions such as moving up and down, traversing, tilting, deflecting or rotating with respect to the hollow base 10 to adjust the relative position of the lens group 30 and the photosensitive element 41 to maintain a predetermined imaging focal length, and to make the optical axis of the lens group 30 substantially perpendicular to the photosensitive plane of the photosensitive element 41 (i.e. the photosensitive element 41 or the lens group 30 is not tilted to avoid the problem of image corner blur). As shown in fig. 3, after the adjustment of the correction ring 20 is completed, the light-cured adhesive layer 15 can be irradiated by specific light, for example, when the light-cured adhesive layer 15 is an ultraviolet light-cured adhesive layer, the light-cured adhesive layer 15 is irradiated by violet light to pre-cure the light-cured adhesive layer 15 to prevent the correction ring 20 from shifting, and finally, the pre-cured light-cured adhesive layer 15 is baked to thermally cure the light-cured adhesive layer 15 to form a cured adhesive layer 14, so that the correction ring 20 is fixed on the assembly plane 12 of the hollow base 10.
As shown in fig. 4, the detection step S02 may be performed after the correction step S01: it is detected whether the corrected position has the lens group 30 in the focusing position. Specifically, since the problem of the lens group 30 going out of focus may still occur during the correction step S01. For example, after the photo-curing adhesive layer 15 is pre-cured or baked, due to the property change of the photo-curing adhesive layer 15, there may be a slight deviation of the correction ring 20, which may cause a problem of focus loss due to a change of the distance between the lens set 30 and the photosensitive element 41, that is, the lens set 30 is deviated from the focusing position and is not kept at a predetermined imaging focal length with the photosensitive element 41, but the invention is not limited thereto. The lens group 30 may also be affected by other factors (e.g., the hollow base 10, the correction ring 20 or the lens group 30 expands due to heat) to cause defocus. Therefore, whether the lens group 30 is in focus can be further detected by the optical instrument after the correction step S01.
As shown in fig. 4, the focus adjustment step S03 may be performed after the detection step S02: when the lens group 30 is not in the focused position, the lens group 30 is rotated relative to the correction ring 20 to be axially moved to the focused position. Referring to fig. 6, after the detecting step S02, if the lens group 30 is out of focus and not in the focus position, the force can be applied to release the lens group 30 from the correcting ring 20, and the lens group 30 is rotated to move axially relative to the correcting ring 20 and the hollow base 10 (as shown by arrow L1), so as to further adjust the relative position of the lens group 30 and the photosensitive element 41 to maintain the predetermined imaging focal length (i.e. the focus position).
As shown in fig. 4, a gluing step S04 may be performed after the focusing step S03: the adhesive a is filled between the external thread 311 and the internal thread 211 to fix the lens group 30 and the correction ring 20. Referring to fig. 2 and fig. 6, in an embodiment of the present invention, the first ring surface 22 of the calibration ring 20 is further provided with a flange 25, the flange 25 surrounds the shaft hole 21 and is provided with at least one radial glue inlet hole 24, and the radial glue inlet hole 24 is communicated with the shaft hole 21. As shown in fig. 2, in the present embodiment, the flange 25 is annular and integrally formed on the first annular surface 22, two radial glue-feeding holes 24 radially penetrate through the flange 25 to communicate with the shaft hole 21, and the two radial glue-feeding holes 24 are symmetrically disposed about a center point of the shaft hole 21, but the present invention is not limited thereto. In some embodiments, the flange 25 may also be an annular block and fixed to the first annular surface 22 of the calibration ring 20 by an assembling method (e.g., gluing or fitting). The first ring surface 22 of the calibration ring 20 may not be provided with the flange 25, and the radial glue inlet hole 24 may penetrate radially from the ring peripheral surface 26 of the calibration ring 20 to the shaft hole 21, and drawing of this embodiment is omitted.
Thus, as shown in fig. 6 and 7, when the lens group 30 rotates relative to the calibration ring 20 to move axially to the focusing position, the adhesive a is filled between the external thread 311 and the internal thread 211 from the two radial glue-in holes 24 (as shown by arrow L2 in fig. 6), so that the lens group 30 and the calibration ring 20 are bonded and fixed at the focusing position.
In summary, according to the lens device 1 and the lens focusing method of the embodiment of the invention, the outer thread 311 of the lens barrel 31 of the lens group 30 is screwed into the inner thread 211 of the calibration ring 20, so as to be adjusted to a calibrated position by the calibration ring 20 and fixed on the assembly plane 12 of the hollow base 10. Thus, when the corrected position fails to place the lens group 30 in the focusing position, the lens group 30 can also be rotated relative to the correction ring 20 to move relative to the correction ring 20 and the hollow base 10 to adjust focusing. Alternatively, when the lens group 30 is damaged, the lens group 30 can be removed by rotating relative to the correction ring 20 to be replaced with another new lens group 30, so as to achieve the advantage of effectively reducing the cost without eliminating the whole lens device 1.
As shown in fig. 4 and 7, in one embodiment, the adhesive a filled between the external thread 311 and the internal thread 211 in the gluing step S04 can be super glue, instant glue, or epoxy glue, so that the lens assembly 30 and the calibration ring 20 can be fixed without other processes after the adhesive a is filled.
As shown in fig. 4 and 7, in another embodiment, the adhesive a filled between the external thread 311 and the internal thread 211 in the gluing step S04 can be a light-cured adhesive (e.g., an ultraviolet light-cured adhesive), and the adhesive a can be irradiated by a specific light after being filled, for example, when the adhesive a is an ultraviolet light-cured adhesive, the adhesive a is irradiated by a violet light to pre-cure the adhesive a (pre-cure) to prevent the lens group 30 from displacing, and finally, the pre-cured adhesive a is baked to thermally cure the adhesive a to fix the lens group 30 and the correction ring 20.
As shown in fig. 6 and 7, in one embodiment, the calibration ring 20 may be a light-transmitting ring, for example, the calibration ring 20 may be made of a transparent material (e.g., transparent acryl or transparent plastic) and may be in a translucent or transparent state, so that specific light can penetrate the calibration ring 20 from the outside to irradiate the adhesive a, thereby reducing the difficulty of manufacturing.
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention.
[ notation ] to show
1 lens device
10 hollow base
11 bottom surface
12 assembly plane
13 through hole
14 cured adhesive layer
15 photo-curing adhesive layer
20 correction ring
21 axle hole
211 internal thread
22 first annulus
23 second annular surface
24 radial glue inlet hole
25 Flange
26 ring circumference
30 lens group
31 lens barrel
311 external screw thread
40 circuit board
41 photosensitive assembly
L1, L2 arrows
A Adhesives
S01 correction step
S02 detection step
S03 Focus adjustment step
S04 gluing step
Claims (10)
1. A lens apparatus, characterized in that the lens apparatus comprises:
the hollow base comprises a bottom surface and an assembly plane opposite to the bottom surface, and the assembly plane is provided with a through hole;
the correcting ring comprises a shaft hole, a first ring surface and a second ring surface which are opposite to each other in the axial direction, an internal thread is arranged on the inner wall of the shaft hole, the shaft hole corresponds to the through hole of the hollow base, the correcting ring is located at a corrected position, and the second ring surface is fixed on the assembling plane of the hollow base through a curing adhesive layer; and
a lens group including a lens barrel provided with an external thread, the lens barrel being screwed in the internal thread of the correction ring with the external thread;
wherein the corrected position maintains the lens group at a predetermined imaging focal length and the lens barrel is still selectively rotatable with respect to the correction ring;
the thickness of the correction ring is smaller than that of the lens barrel, and the length of the external thread is larger than that of the internal thread, so that the lens barrel can rotate relative to the correction ring and penetrate out of the second ring surface.
2. The lens device as claimed in claim 1, further comprising a circuit board, wherein the circuit board is provided with a photosensitive assembly, the bottom surface of the hollow base is fixedly disposed on the circuit board, and the photosensitive assembly is located in the hollow base.
3. The lens device as claimed in claim 1, wherein the correction ring is further provided with a radial glue inlet hole, and the radial glue inlet hole is communicated with the shaft hole.
4. A lens device as claimed in claim 3, wherein the first annular surface of the correction ring is further provided with a flange, and the radial glue holes are provided on the flange.
5. The lens device according to claim 1, wherein the correction ring is a light-transmissive ring.
6. A lens focusing method, comprising:
a correction step: preparing a hollow base, a correction ring and a lens group, wherein the hollow base comprises a bottom surface and an assembly plane opposite to the bottom surface, the assembly plane is provided with a through hole, the correction ring comprises a shaft hole and a first annular surface and a second annular surface which are opposite in axial direction, the inner wall of the shaft hole is provided with an internal thread, the lens group comprises a lens barrel which is provided with an external thread, the lens barrel is screwed on the internal thread of the correction ring by the external thread, the shaft hole of the correction ring corresponds to the through hole of the hollow base, the correction ring moves to a corrected position relative to the hollow base and is bonded on the assembly plane of the hollow base by the second annular surface through a solidified glue layer, the thickness of the correction ring is smaller than that of the lens barrel, and the length of the external thread is larger than that of the internal thread, enabling the lens barrel to rotate relative to the correction ring and penetrate out of the second annular surface;
A detection step: detecting whether the corrected position enables the lens group to be located at a focusing position;
a focusing step: when the lens group is not in the focusing position, rotating the lens group relative to the correcting ring to axially move to the focusing position; and
gluing: and filling adhesive between the external thread and the internal thread to fix the lens group and the correction ring.
7. A lens focusing method according to claim 6, wherein the correcting ring in the correcting step is further provided with a radial glue inlet hole, the radial glue inlet hole is communicated with the shaft hole, and the gluing step further comprises: the adhesive is filled between the external thread and the internal thread through the radial adhesive inlet hole.
8. The lens focusing method according to claim 6, further comprising, in the gluing step: irradiating the adhesive with light to cure the adhesive.
9. A lens focusing method according to claim 8, wherein the correction ring of the correcting step is a light-transmitting ring, and further comprising in the gluing step: the light is transmitted through the calibration ring to irradiate the adhesive.
10. A lens focusing method according to claim 6, wherein the correcting ring of the correcting step is held by a robot arm and moved relative to the hollow base so that the correcting ring is located at the post-correction position.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168387.6A CN111007619B (en) | 2018-10-08 | 2018-10-08 | Lens device and lens focusing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811168387.6A CN111007619B (en) | 2018-10-08 | 2018-10-08 | Lens device and lens focusing method |
Publications (2)
| Publication Number | Publication Date |
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| CN111007619A CN111007619A (en) | 2020-04-14 |
| CN111007619B true CN111007619B (en) | 2022-06-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201811168387.6A Active CN111007619B (en) | 2018-10-08 | 2018-10-08 | Lens device and lens focusing method |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114338961B (en) * | 2020-09-30 | 2024-04-02 | 宁波舜宇光电信息有限公司 | Lens fixing structure, corresponding camera module and assembling method |
| TWI765693B (en) * | 2021-05-05 | 2022-05-21 | 群光電子股份有限公司 | Lens device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN2636263Y (en) * | 2003-07-26 | 2004-08-25 | 鸿富锦精密工业（深圳）有限公司 | Lens module and digital camera using same |
| TWM251156U (en) * | 2003-11-25 | 2004-11-21 | Hon Hai Prec Ind Co Ltd | Lens module |
| CN1885909A (en) * | 2005-06-24 | 2006-12-27 | 鸿富锦精密工业（深圳）有限公司 | Digital camera module |
| CN102340622A (en) * | 2010-07-19 | 2012-02-01 | 鸿富锦精密工业（深圳）有限公司 | Image acquisition module |
| US10341541B2 (en) * | 2015-08-14 | 2019-07-02 | Gopro, Inc. | Integrated sensor and lens assembly with post-tuning optical alignment |
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