Camera module

Abstract

The present invention provides a camera module, including a circuit board, a photosensitive element, a first lens assembly, a second lens assembly, a light guide and a light source assembly, wherein the photosensitive element is arranged on the circuit board, the photosensitive element is electrically connected to the circuit board, the first lens assembly and the second lens assembly are located on a side of the photosensitive element away from the circuit board, the second lens assembly is located on a side of the first lens assembly away from the photosensitive element, the light guide is arranged outside the second lens assembly, the light source assembly is arranged adjacent to the light guide, the first lens assembly is a fixed focus lens, and the second lens assembly is a zoom lens. The camera module provided by the present invention can achieve micro-focus shooting and obtain good imaging effects by arranging two lens assemblies and cooperating with the light guide and the light source assembly for fill light.

Description

Technical Field

[0001] The present invention relates to the field of imaging technology, and in particular to a camera module. Background Art

[0002] With the advancement of science and technology, cameras are being used more and more widely. At present, in addition to cameras, mobile phones, computers and other electronic products are equipped with cameras to facilitate people to take pictures anytime and anywhere, bringing convenience and fun to people's lives.

[0003] As cameras become more and more popular, people have more and more requirements for camera functions, and super macro cameras are currently a development direction. In order to capture the detailed features of objects at close range, such super macro cameras are needed. Summary of the invention

[0004] The purpose of the present invention is to provide an ultra-macro camera module.

[0005] The present invention provides a camera module, including a circuit board, a photosensitive element, a first lens assembly, a second lens assembly, a light guide and a light source assembly, wherein the photosensitive element is arranged on the circuit board, the photosensitive element is electrically connected to the circuit board, the first lens assembly and the second lens assembly are located on a side of the photosensitive element away from the circuit board, the second lens assembly is located on a side of the first lens assembly away from the photosensitive element, the light guide is arranged outside the second lens assembly, the light source assembly is arranged adjacent to the light guide, the first lens assembly is a fixed-focus lens, and the second lens assembly is a zoom lens.

[0006] In one embodiment, the camera module further includes a base and a driving device, the base is disposed on the circuit board, the driving device is disposed on the base, the first lens assembly is disposed on the base, and the second lens assembly is disposed on the driving device.

[0007] In one embodiment, the light guide is disposed outside the second lens assembly, and the light source assembly is disposed at the bottom of the light guide.

[0008] In one embodiment, the light guide is ring-shaped and surrounds the entire outer side of the second lens assembly.

[0009] In one embodiment, the light guide is fixed to the outside of the driving device and is partially exposed at the top of the driving device, and the second lens assembly is partially exposed at the top of the driving device.

[0010] In one embodiment, an inclined side surface is disposed on an inner side of a top of the light guide component, and the side surface faces a light incident side of the second lens assembly.

[0011] In one embodiment, the light source assembly includes a plurality of light sources, the plurality of light sources are circumferentially arranged at the bottom of the light guide member, and the light sources are located outside the driving device.

[0012] In one embodiment, the light source assembly further includes a base plate, a plurality of the light sources are fixed on the base plate, the base plate is fixed relative to the mounting base, the base plate is a circuit board, and the light sources are electrically connected to the base plate.

[0013] In one embodiment, the camera module further includes a cover plate, which is disposed on the top of the light guide and is located on a side of the second lens assembly away from the photosensitive element.

[0014] In one embodiment, the camera module also includes a filter, and a fixing platform protruding inward is formed on the inner wall of the base. The filter is fixed to the fixing platform, and the filter is located between the photosensitive element and the first lens assembly and the second lens assembly.

[0015] The camera module provided by the present invention can realize micro-focus shooting and obtain good imaging effect by arranging two lens assemblies and cooperating with the light guide and light source assembly for fill light. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a three-dimensional assembly diagram of a camera module according to an embodiment of the present invention.

[0017] Figure 2 for Figure 1 A three-dimensional exploded view of the camera module shown.

[0018] Figure 3 for Figure 1 A cross-sectional view of the camera module shown.

[0019] Figure 4 for Figure 1 A schematic structural diagram of the second lens assembly of the camera module shown.

[0020] Figure 5 The present invention is a flowchart of a camera module manufacturing method according to an embodiment of the present invention. DETAILED DESCRIPTION

[0021] In order to further explain the technical methods and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention are described in detail below in conjunction with the accompanying drawings and embodiments.

[0022] like Figures 1 to 3As shown, a camera module according to an embodiment of the present invention includes a circuit board 11, a photosensitive element 13, a base 15, a filter 17, a first lens assembly 19, a second lens assembly 21, a driving device 23, a light guide 25, a light source assembly 27 and a cover plate 29.

[0023] In this embodiment, the photosensitive element 13 and the base 15 are both arranged on the circuit board 11, and the base 15 forms a cavity 152, and the photosensitive element 13 is accommodated in the cavity 152. Specifically, the circuit board 11 can be a flexible circuit board. The photosensitive element 13 can be a photosensitive chip, such as a CCD (Charge Coupled Device) photosensitive chip or a CMOS (Complementary Metal Oxide Semiconductor) photosensitive chip. The photosensitive element 13 is electrically connected to the circuit board 11 to transmit an electrical signal to the circuit board 11. A fixing platform 154 protruding inward is formed on the inner wall of the base 15.

[0024] In this embodiment, the filter 17 is disposed on the fixing platform 154, and the filter 17 is located between the photosensitive element 13 and the first lens assembly 19 and the second lens assembly 21. In this embodiment, the filter 17 is disposed below the fixing platform 154. It can be understood that the filter 17 can also be located above the fixing platform 154. The filter 1 can be fixed on the fixing platform 154 by glue.

[0025] In this embodiment, the first lens assembly 19 is disposed on the base 15. Specifically, the first lens assembly 19 includes a first lens group and a first lens barrel, the first lens group is assembled in the first lens barrel, the outer side of the first lens barrel is provided with an external thread, the inner wall of the base 15 is provided with an internal thread, and the first lens assembly 19 is fixed in the base 15. The first lens assembly 19 is a fixed-focus lens.

[0026] In this embodiment, the second lens assembly 21 is disposed on a driving device 23, and the driving device 23 is disposed on the base 15, so that the second lens assembly 21 is located on a side of the first lens assembly 19 away from the photosensitive element 13. Specifically, the driving device 23 is disposed on a side of the base 15 away from the circuit board 11. The second lens assembly 21 is a zoom lens.

[0027] The second lens assembly 21 includes a second lens group and a second lens barrel, and the second lens group is assembled in the second lens barrel. An extension portion 212 protrudes downward from the bottom edge of the second lens barrel, and the extension portion 212 cooperates with the driving device 23. Since the bottom of the second lens barrel is provided with the extension portion 212, the height of the second lens assembly 21 combined with the driving device 23 is increased, thereby improving the combination strength of the second lens assembly 21 and the driving device 23. Correspondingly, the end of the first lens assembly 19 away from the circuit board 11 protrudes into the space formed by the extension portion 212 of the second lens assembly 21, and a yield portion is formed corresponding to the position of the extension portion 212.

[0028] Please also read Figure 4 , a first groove 214 is provided on the outer side wall of the second lens assembly 21, and a second groove 232 is provided on the inner side wall of the driving device 23, and the portion of the second lens assembly 21 provided with the first groove 214 corresponds to the portion of the driving device 23 provided with the second groove 232. Due to the provision of the first groove 214 and the second groove 232, when the second lens assembly 21 is connected to the driving device 23 by glue, the glue will flow into the first groove 214 and the second groove 232, and the cured glue will be tooth-shaped, which can improve the bonding strength between the second lens assembly 21 and the driving device 23. Specifically, the first groove 214 is provided on the second lens barrel.

[0029] Specifically, the first groove 214 is recessed inwardly in an annular shape along the outer circumference of the second lens assembly 21, and the second groove 232 is recessed inwardly in an annular shape from the inner wall surface of the driving device 23. Along the direction of the optical axis of the second lens assembly 21, the width of the first groove 214 is greater than the width of the second groove 232, and / or the first groove 214 and the second groove 232 are arranged alternately.

[0030] In one embodiment, a first groove 214 may also be formed on the outer circumferential surface of the extending portion 212 of the second lens assembly 21 .

[0031] A cutout 216 is also provided on the outer wall of the second lens assembly 21. At the position of the cutout 216, the gap between the outer wall of the second lens assembly 21 and the inner wall of the driving device 23 is increased, which facilitates the glue to flow downward, thereby fully filling the gap between the second lens assembly 21 and the driving device 23. Specifically, a plurality of cutouts 216 are provided on the second lens assembly 21, and the cutouts 216 connect the first groove 214 and the second groove 232 and form an opening toward the side away from the circuit board 11. Specifically, the cutout 216 is provided at the portion of the second lens assembly 21 where the first groove 214 is provided. More specifically, a plurality of cutouts 216 are evenly provided on the second lens assembly 21 along the circumferential direction.

[0032] A gate 218 is disposed on the outer wall of the second lens assembly 21 , and the gate 218 and the cutout 216 are staggered in the circumferential direction of the second lens assembly 21 .

[0033] In this embodiment, the driving device 23 may be a voice coil motor. Of course, the driving device 23 may also be a driving device made of memory alloy, as long as it can drive the second lens assembly 21 to move up and down for zooming. Specifically, the voice coil motor includes a shell, a magnet, a carrier and a coil. The magnet is arranged on the shell, the coil is arranged on the carrier, and the second lens assembly 21 is fixed on the carrier. By energizing the coil, under the action of the magnet, a magnetic force can be generated to push the carrier to move linearly relative to the shell, thereby realizing the focusing of the second lens assembly 21. Specifically, the shell is fixed on the base 15. The second groove 232 is opened on the carrier.

[0034] In this embodiment, the light guide 25 is arranged outside the second lens assembly 21, and the light guide 25 is annular, surrounding the outside of the entire second lens assembly 21. The light guide 25 guides the light toward the optical axis of the second lens assembly 21, which can fill in the light for the camera module and improve the imaging effect of the camera module; and because the light guide 25 surrounds the second lens assembly 21 in an annular shape, the uniformity of the fill in light can be better, further improving the imaging effect of the camera module. Specifically, the light guide 25 is fixed to the outside of the driving device 23 and partially exposed at the top of the driving device 23, and the second lens assembly 21 is partially exposed at the top of the driving device 23.

[0035] The light guide 25 includes an upper portion 250 and a lower portion 251, and a step surface 253 is formed at the connection between the upper portion 250 and the lower portion 251, and the step surface 253 is closely fitted with the top surface of the driving device 23. Specifically, the upper portion 250 is located above the driving device 23, and the lower portion 251 is located outside the driving device 23. Since the step surface 253 is closely fitted with the top surface of the driving device 23, the height of the entire camera module can be controlled, which is conducive to the thinness and miniaturization of the camera module.

[0036] An inclined side surface 252 is provided on the inner side of the top of the light guide 25, and the side surface 252 faces the light incident side of the second lens assembly 21. The inclined side surface 252 can better guide the light toward the optical axis of the second lens assembly 21. Specifically in this embodiment, the side surface 252 is a conical surface.

[0037] A top surface 254 is provided on the top of the light guide 25 away from the circuit board 11. The light guide 25 also includes a protrusion 256 protruding from the top surface 254 to form a receiving groove on the top of the light guide 25. The top of the second lens assembly 21 is closer to the circuit board 11 than the top surface 254, that is, the second lens assembly 21 is not higher than the top surface 254 of the light guide 25. Specifically, the top surface 254 is perpendicular to the optical axis of the lens assembly. In other embodiments, the protrusion 256 may also be provided on the housing of the electronic product; or, the protrusion 256 may also be an independent setting. Specifically, the protrusion 256 may be a fixing ring to facilitate the installation of the cover plate 29.

[0038] In this embodiment, the light source assembly 27 is arranged at the bottom of the light guide 25. In this way, the light of the light source assembly 27 can better enter the light guide 25, achieve a better fill light effect, and thus improve the imaging effect of the camera module. Specifically, the light source assembly 27 includes a plurality of light sources 272 and a base plate 274, wherein the plurality of light sources 272 are circumferentially arranged at the bottom of the light guide 25, and the plurality of light sources 272 are fixed on the base plate 274, and the base plate 274 is fixed relative to the base 15. More specifically, the plurality of light sources 272 are uniformly arranged at the bottom of the light guide 25 along the circumferential direction. The light source 272 is located outside the driving device 23 and the base 15. Specifically, the light source 272 can be an LED or other type of light source, the base plate 274 is a circuit board, the light source 272 is electrically connected to the base plate 274, and is powered and controlled to light up and down through the base plate 274.

[0039] In this embodiment, the cover plate 29 is covered on the top of the light guide 25 and is located on the side of the second lens assembly 21 away from the photosensitive element 13 to protect the first lens assembly 19 and the second lens assembly 21 and prevent the lens assembly from being contaminated or damaged. Specifically, the cover plate 29 is tightly fitted on the top surface 254 of the light guide 25 and is accommodated in the accommodating groove. First, since the cover plate 29 that protects the first lens assembly 19 and the second lens assembly 21 is a part of the camera module, it can be pre-installed on the camera module. Therefore, compared with installing the camera module on the mobile phone shell during the assembly of the mobile phone, the distance between the cover plate 29 and the first lens assembly 19 and the second lens assembly 21 in this embodiment can be controlled in the manufacture of the camera module, and the height of the entire camera module is conducive to the thinness and miniaturization of the camera module. Since the cover plate 29 is tightly fitted with the top surface 254, the gap h between the top of the second lens assembly 21 and the cover plate 29 can be controlled to be small enough, thereby reducing the height of the entire camera module, which is conducive to the thinness and miniaturization of the camera module. Specifically, the cover plate 29 is a glass cover plate.

[0040] It can be understood that the light guide 25 can be applied to the camera module with two lens assemblies in the present embodiment, and can also be applied to the camera module with only one lens assembly or three or more lens assemblies. There is no limitation here. The light guide 25 can play the role of fill light. The first lens assembly 19 and the second lens assembly 21 can also be fixed-focus lenses or zoom lenses. For example, when the second lens assembly 21 is a fixed-focus lens, the driving device 23 can be replaced by the base 15, that is, the second lens assembly 21 is also installed on the base 15. At this time, the light guide 25 is fixed on the outside of the base 15 and partially exposed on the top of the base 15. The step surface 253 of the light guide 25 is tightly fitted with the top surface of the base 15. In other words, the light guide 25 is installed on a mounting seat such as a driving device or a base, and corresponds to the lens assembly.

[0041] The present invention also provides a camera module manufacturing method for manufacturing the above-mentioned camera module. Figure 5 The camera module manufacturing method comprises the following steps:

[0042] S11, provide a circuit board 11 and a photosensitive element 13, set the photosensitive element 13 on the circuit board 11, and electrically connect the photosensitive element 13 to the circuit board 11 to transmit an electrical signal to the circuit board 11. Specifically, the circuit board 11 may be a flexible circuit board. The photosensitive element 13 may be a photosensitive chip, such as a CCD (Charge Coupled Device) photosensitive chip or a CMOS (Complementary Metal Oxide Semiconductor) photosensitive chip. When the photosensitive element 13 is electrically connected to the circuit board 11, it can be achieved by punching gold wire. When providing the circuit board 11, firstly form a circuit substrate by SMT (surface mount technology) patch technology, and then cut and layout the circuit substrate to form the circuit board 11.

[0043] S13, provide a base 15 and a filter 17, set the filter 17 on the base 15, set the base 15 on the circuit board 11, and install the first lens assembly 19 on the base 15. Specifically, a fixing platform 154 protruding inward is formed on the inner wall of the base 15, and the filter 17 is set on the fixing platform 154, and the filter 17 is located on the side of the photosensitive element 13 away from the circuit board 11. The first lens assembly 19 can be a fixed focus lens. The first lens assembly 19 can be fixed in the base 15 by threading, and then fixed by dispensing glue. In step S13, the installed components are also baked to allow the glue to cure quickly.

[0044] S15, debugging the first lens assembly 19. Specifically, focusing the first lens assembly 19. Step S15 also includes cleaning the assembled components.

[0045] S17, provide a second lens assembly 21 and a driving device 23, and install the second lens assembly 21 on the driving device 23. Specifically, the second lens assembly 21 may be a zoom lens. Specifically, the second lens assembly 21 is fixed to the driving device 23 by glue. The driving device 23 may be a voice coil motor, and specifically, the voice coil motor includes a housing, a magnet, a carrier, and a coil, the magnet is arranged on the housing, the coil is arranged on the carrier, and the second lens assembly 21 is fixed on the carrier. In step S17, it also includes cleaning the driving device 23 before installing the second lens assembly 21 on the driving device 23, and baking the assembled driving device 23 and the second lens assembly 21 after the second lens assembly 21 is installed on the driving device 23, and cleaning the second lens assembly 21 after baking.

[0046] Specifically, a first groove 214 is provided on the outer side wall of the second lens assembly 21, and a second groove 232 is provided on the inner side wall of the driving device 23. The portion of the second lens assembly 21 where the first groove 214 is provided corresponds to the portion of the driving device 23 where the second groove 232 is provided. A cutout 216 is also provided on the outer side wall of the second lens assembly 21. A plurality of cutouts 216 are provided on the second lens assembly 21 at intervals. More specifically, a plurality of cutouts 216 are uniformly provided on the second lens assembly 21 along the circumferential direction. The cutouts 216 are provided at the portion of the second lens assembly 21 where the first groove 214 is provided. In step S17, glue is injected from the cutouts 216, and the glue flows into the first groove 214 and the second groove 232, thereby fully filling the gap between the second lens assembly 21 and the driving device 23.

[0047] S19, installing the driving device 23 with the second lens assembly 21 on the base 15. Specifically, the driving device 23 is arranged on a side of the base 15 away from the circuit board 11. In step S19, it also includes baking after installing the driving device 23 on the base 15 to dry the glue.

[0048] S21, perform a functional test on the first lens assembly 19 and the second lens assembly 21. Specifically, test the focal lengths of the first lens assembly 19 and the second lens assembly 21 to determine whether they meet the requirements.

[0049] S23, provide a light guide 25 and a light source assembly 27, and install the light guide 25 outside the second lens assembly 21. Specifically, the light guide 25 is annular, surrounding the entire outside of the second lens assembly 21, and the light source assembly 27 is arranged at the bottom of the light guide 25.

[0050] Specifically, the light guide 25 includes an upper portion 250 and a lower portion 251, and a step surface 253 is formed at the connection between the upper portion 250 and the lower portion 251, and the step surface 253 is closely fitted with the top surface of the driving device 23. Specifically, the upper portion 250 is located above the driving device 23, and the lower portion 251 is located outside the driving device 23.

[0051] S25, provide a cover plate 29, and cover the cover plate 29 on the top of the light guide 25, and on the side of the second lens assembly 21 away from the photosensitive element 13, thereby assembling a camera module. Specifically, the cover plate 29 is tightly attached to the top surface 254 of the light guide 25. Specifically, the cover plate 29 is a glass cover plate.

[0052] S27, perform a functional test on the camera module. Specifically, the camera module after assembling the light guide 25 is tested to test the performance of the light guide 25. In step S27, the camera module is also inspected for appearance and packed for storage.

[0053] The above are only preferred embodiments of the present invention, and are not intended to limit the present invention in any form. Although the present invention has been disclosed as above in preferred embodiments, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A camera module, comprising a circuit board (11) and a photosensitive element (13), characterized in that: The camera module further comprises a first lens assembly (19), a second lens assembly (21), a light guide (25) and a light source assembly (27); the photosensitive element (13) is arranged on the circuit board (11); the photosensitive element (13) is electrically connected to the circuit board (11); the first lens assembly (19) and the second lens assembly (21) are located on a side of the photosensitive element (13) away from the circuit board (11); the second lens assembly (21) is located on a side of the first lens assembly (19) away from the photosensitive element (13); the light guide (25) is arranged outside the second lens assembly (21); the light source assembly (27) is arranged adjacent to the light guide (25); the first lens assembly (19) is a fixed-focus lens; and the second lens assembly (21) is a zoom lens; The camera module further comprises a base (15) and a driving device (23), wherein the base (15) is arranged on the circuit board (11), the driving device (23) is arranged on the base (15), the first lens assembly (19) is arranged on the base (15), and the second lens assembly (21) is arranged on the driving device (23); The light guide (25) is fixed to the outside of the driving device (23) and partially exposed at the top of the driving device (23); the second lens assembly (21) is partially exposed at the top of the driving device (23); and the light source assembly (27) is arranged at the bottom of the light guide (25).

2. The camera module according to claim 1, wherein: The light guide (25) is annular and surrounds the entire outer side of the second lens assembly (21).

3. The camera module according to claim 1, wherein: An inclined side surface (252) is provided on the inner side of the top of the light guide (25), and the side surface (252) faces the light incident side of the second lens assembly (21).

4. The camera module according to claim 1, wherein: The light source assembly (27) comprises a plurality of light sources (272), the plurality of light sources (272) being arranged at the bottom of the light guide member (25) along the circumferential direction, and the light sources (272) being located outside the driving device (23).

5. The camera module according to claim 4, wherein: The light source assembly (27) further comprises a bottom plate (274), a plurality of the light sources (272) are fixed on the bottom plate (274), the bottom plate (274) is fixed relative to the base (15), the bottom plate (274) is a circuit board, and the light sources (272) are electrically connected to the bottom plate (274).

6. The camera module according to claim 1, wherein: The camera module further comprises a cover plate (29), wherein the cover plate (29) is arranged on the top of the light guide member (25) and is located on a side of the second lens assembly (21) away from the photosensitive element (13).

7. The camera module according to claim 1, wherein: The camera module further comprises a filter (17); an inner wall of the base (15) is formed with a fixing platform (154) protruding inwardly; the filter (17) is fixed to the fixing platform (154); and the filter (17) is located between the photosensitive element (13) and the first lens assembly (19), and the second lens assembly (21).

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