Camera device

Abstract

The utility model provides a camera device, comprising a CMOS photosensitive chip and a lens assembly, the lens assembly comprises a housing, and a plane mirror, an aspherical lens group and an optical filter which are arranged in the housing and are sequentially arranged from an object side to an image side; a first assembly cavity, a second assembly cavity and a third assembly cavity which are distributed in the optical axis direction are formed in the shell, a boss limiting structure is further arranged in the shell and located between the first assembly cavity and the third assembly cavity, the second assembly cavity is formed in the inner side of the boss limiting structure, and the plane mirror is fixed in the first assembly cavity. The aspherical lens group is embedded in the second assembly cavity, and the optical filter is fixed in the third assembly cavity; the plane mirror, the shell and the aspherical lens group are packaged through a first sealing compound piece, and the optical filter and the CMOS photosensitive chip are packaged through a second sealing compound piece. According to the camera device, complicated assembling structures such as a lens base are omitted, and the device is simple in structure and small in size.

Description

Technical Field

[0001] The utility model belongs to the technical field of camera lenses, and in particular relates to a camera device. Background Art

[0002] Miniature cameras can be used in medical endoscopes, industrial electronic endoscopes, industrial pipeline endoscopes, automotive endoscopes, and other products, playing a significant role in medical, civilian, police, scientific research, and industrial fields. In related technologies, miniature cameras typically consist of a lens, a lens mount, a circuit board, and a CMOS sensor. The lens assembly is housed within the lens, which is threadedly connected to the lens mount. The CMOS sensor is encapsulated and fixed to the circuit board. Miniature cameras are complex in structure, and cameras assembled using this method are bulky and have poor waterproofing, making them difficult to meet user needs for miniaturization. Utility Model Content

[0003] The technical purpose of the present invention is to provide a camera device, aiming to solve the problems of the micro camera device in the related art that the structure is relatively complex, the volume is large and the waterproofness is poor.

[0004] To solve the above technical problems, the present invention is implemented as follows: a camera device includes: a CMOS photosensitive chip and a lens assembly fixed to the CMOS photosensitive chip, the lens assembly includes a shell and a plane mirror, an aspheric lens group, and a filter arranged in the shell and arranged in sequence from the object side to the image side along the optical axis; a first assembly cavity, a second assembly cavity and a third assembly cavity distributed along the optical axis are provided in the shell, and a boss limiting structure is also provided in the shell, the boss limiting structure is located between the first assembly cavity and the third assembly cavity, the second assembly cavity is formed on the inner side of the boss limiting structure, the plane mirror is fixed in the first assembly cavity, the aspheric lens group is embedded in the second assembly cavity, and the filter is fixed in the third assembly cavity; the plane mirror, the shell and the aspheric lens group are packaged by a first sealing member, and the filter and the CMOS photosensitive chip are packaged by a second sealing member.

[0005] Furthermore, the shell is a non-transparent body.

[0006] Furthermore, the shell is one of a ceramic part, a metal part, an alloy part, and a plastic part.

[0007] Furthermore, the plane mirror is a glass or plastic part, and / or the filter is a glass or plastic part.

[0008] Furthermore, the aspheric lens group includes a concave lens and a convex lens.

[0009] Furthermore, the aspheric lens group further includes a stop.

[0010] Furthermore, the aspheric lens group includes a first aspheric lens, a second aspheric lens and a third aspheric lens arranged in sequence from the object side to the image side, and the aperture is arranged between the second aspheric lens and the third aspheric lens; the first aspheric lens has a concave surface on one side facing the second aspheric lens, and a flat surface on the other side; the second aspheric lens has convex surfaces on both sides; the third aspheric lens has a convex surface on the side close to the CMOS photosensitive chip, and a flat surface on the other side.

[0011] Furthermore, the first aspheric lens has negative optical power, and the second aspheric lens and the third aspheric lens each have positive optical power.

[0012] Furthermore, the boss limiting structure is further connected to an abutment platform extending toward the optical axis, and the aspheric lens group and the filter are respectively abutted against opposite sides of the abutment platform.

[0013] Furthermore, the shell and the boss limiting structure are an integrated connecting part.

[0014] Compared with the prior art, the camera device of the present invention has the following beneficial effects: the lens assembly is fixed by the shell, and the CMOS photosensitive chip is directly fixed to the shell, which eliminates the structural parts of the lens seat, simplifies the structure of the camera device, eliminates the volume of the lens seat itself and the installation gap between the lens seat and the lens shell, improves the space utilization of the camera device, and can greatly reduce the volume of the camera device. In addition, through the design of the shell and the boss limit structure, each lens can be well positioned. When assembling, the lens can be directly installed into the corresponding assembly cavity to achieve optical axis alignment, and the assembly operation is simple. In addition, using the sealing parts at both ends of the lens assembly to glue the lenses together can reduce reflection loss, improve light transmittance, reduce aberrations, correct chromatic aberration and spherical aberration, and improve the connection stability between the corresponding lenses and between the lens and the CMOS photosensitive chip, and also improve the waterproof and moisture-proof performance of the entire camera module. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the overall structure of the camera device in the embodiment of the utility model;

[0016] Figure 2 is a schematic cross-sectional view of a camera device in an embodiment of the present utility model;

[0017] Figure 3 is an isometric cross-sectional view of the housing in an embodiment of the present utility model;

[0018] Figure 4 This is an exploded view of the camera device in the embodiment of the present utility model;

[0019] Figure 5 It is a light path diagram of the camera device in the embodiment of the utility model.

[0020] In the accompanying drawings, the various reference numerals represent: 1. CMOS photosensitive chip; 2. lens assembly; 21. housing; 211. boss limiting structure; 2111. second assembly cavity; 212. first assembly cavity; 213. third assembly cavity; 214. abutment platform; a. first step surface; b. second step surface; 22. plane mirror; 23. aspheric lens group; 231. first aspheric lens; 232. second aspheric lens; 233. aperture; 234. third aspheric lens; 24. filter; 25. first sealing member; 26. second sealing member. DETAILED DESCRIPTION

[0021] The following describes in detail embodiments of the present invention, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "circumferential", "radial", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of this utility model, "plurality" means two or more, unless otherwise specifically defined.

[0024] Example:

[0025] like Figure 1-5As shown, in this embodiment, the camera device includes: a CMOS photosensitive chip 1 and a lens assembly 2 fixed to the CMOS photosensitive chip 1, the lens assembly 2 includes a housing 21 and a plane mirror 22, an aspheric lens group 23, and a filter 24 arranged in the housing 21 and arranged in sequence from the object side to the image side along the optical axis; the housing 21 is provided with a first assembly cavity 212, a second assembly cavity 2111, and a third assembly cavity 213 distributed along the optical axis, and the housing 21 is also provided with a boss limiting structure 211, the boss limiting structure The structure 211 is located between the first assembly cavity 212 and the third assembly cavity 213, the second assembly cavity 2111 is formed on the inner side of the boss limiting structure 211, the plane mirror 22 is fixed in the first assembly cavity 212, the aspheric lens group 23 is embedded in the second assembly cavity 2111, and the filter 24 is fixed in the third assembly cavity 213; the plane mirror 22, the shell 21, and the aspheric lens group 23 are packaged by a first sealing member 25, and the filter 24 and the CMOS photosensitive chip 1 are packaged by a second sealing member 26.

[0026] Specifically, the lens assembly is fixed by the housing 21, and the CMOS photosensitive chip 1 is directly fixed to the housing 21, eliminating the lens seat parts, eliminating the volume of the lens seat itself and the installation gap between the lens seat and the lens, greatly improving the space utilization of the camera device, and helping to reduce the volume of the camera device. In addition, through the design of the housing 21 and the boss limit structure 211, each lens can be well positioned. During assembly, the lenses can be respectively installed into the corresponding assembly cavities from both sides of the housing 21 to achieve optical axis alignment, and the assembly operation is simple. In addition, by using the sealing parts at both ends of the lens assembly 2 and using the sealing parts to glue the lenses together, reflection loss can be reduced, transmittance can be improved, aberrations can be reduced, chromatic aberration and spherical aberration can be corrected, and the connection stability between the corresponding lenses and between the lenses and the CMOS photosensitive chip 1 can be improved. The waterproof and moisture-proof performance of the entire camera module is also improved. That is, the first sealing part 25 and the second sealing part 26 can not only play a good connection role in the camera device, but also improve the imaging accuracy of the camera device. In this embodiment, both the first sealing member 25 and the second sealing member 26 can be material members formed by curing glue, and the sealing member material can be UV transparent glue or other transparent colloid materials.

[0027] In this embodiment, the housing 21 is a non-transparent body. The plane mirror 22, the aspheric lens group 23, and the filter 24 are directly encapsulated in the opaque housing 21, thereby improving the anti-light leakage performance of the camera device. In this embodiment, the housing 21 is a ceramic part, a metal part, an alloy part, or a plastic part. Specifically, the material of the housing 21 can be zirconium oxide / aluminum nitride, aluminum, copper, plastic, etc., which are cheap and have low processing costs. Preferably, the housing 21 can be a black ceramic material part, which has the advantages of high melting point, high hardness, high wear resistance, oxidation resistance, stable mechanical properties, etc., and has good anti-light leakage performance.

[0028] In this embodiment, the plane mirror 22 can be a glass or plastic member, and / or the optical filter 24 can be a glass or plastic member. Both the glass and plastic members are transparent and light-transmitting. The arrangement of the plane mirror 22 and the optical filter 24 can provide excellent dust and water resistance. Furthermore, through the cooperation between the plane mirror 22 and the first sealing member 25, and the cooperation between the optical filter 24 and the second sealing member 26, the glue can fill the air gaps inside the plane mirror 22 and the optical filter 24, respectively, and can also eliminate the conditions for condensation of water vapor, thereby achieving efficient anti-fogging.

[0029] In this embodiment, the aspheric lens assembly 23 includes a concave lens and a convex lens. This aspheric lens assembly 23 serves as the core imaging unit, and through the combination of various aspheric lenses, it achieves functions such as phase correction and optical modulation. In this embodiment, the aspheric lens assembly 23 further includes an aperture 233. This structure controls the total amount of light entering the imaging device and the depth of field, ensuring imaging accuracy.

[0030] Furthermore, in a specific embodiment, Figure 2 and 5 As shown, the aspheric lens group 23 includes a first aspheric lens 231, a second aspheric lens 232 and a third aspheric lens 234 arranged in sequence from the object side to the image side, and the aperture 233 is arranged between the second aspheric lens 232 and the third aspheric lens 234; the first aspheric lens 231 has a concave surface on one side facing the second aspheric lens 232, and a flat surface on the other side; the second aspheric lens 232 has convex surfaces on both sides; the third aspheric lens 234 has a convex surface on one side close to the CMOS photosensitive chip 1, and a flat surface on the other side.

[0031] Specifically, the camera device comprises, from the object side to the image side along the optical axis, a plane mirror 22, a first aspheric lens 231, a second aspheric lens 232, an aperture 233 provided with an aperture hole, a third aspheric lens 234, and a filter 24; that is, the aperture hole is located between the second aspheric lens 232 and the third aspheric lens 234, wherein the plane mirror has no optical focal length; the first aspheric lens 231 can be a plano-concave aspheric lens with negative optical focal length; the second aspheric lens 232 can be a biconvex aspheric lens with positive optical focal length; the third aspheric lens 234 can be a one-concave and one-convex or one-plan and one-convex aspheric lens with positive optical focal length.

[0032] Exemplarily, the first aspheric lens 231 satisfies the following calculation formula:

[0033] ND1≧1.53

[0034] VD1≧55.6

[0035] Here, ND1 represents the d-light refractive index of the first aspherical lens 231 , and VD1 represents the d-light Abbe constant of the first aspherical lens 231 .

[0036] Exemplarily, the second aspheric lens 232 satisfies the following calculation formula:

[0037] ND2≧1.66

[0038] VD2≧55.9

[0039] Here, ND2 represents the d-light refractive index of the second aspherical lens 232 , and VD2 represents the d-light Abbe constant of the second aspherical lens 232 .

[0040] Exemplarily, the third aspheric lens 234 satisfies the following calculation formula:

[0041] ND3≧1.53

[0042] VD3≧55.6

[0043] Here, ND3 represents the d-light refractive index of the third aspherical lens 234 , and VD3 represents the d-light Abbe constant of the third aspherical lens 234 .

[0044] Exemplarily, the focal length F1 of the plane mirror 22 is infinity, the focal length F2 of the first aspheric lens 231 is -0.30 mm, the focal length F3 of the second aspheric lens 232 is 0.44 mm, and the focal length F4 of the third aspheric lens 234 is 0.54 mm. The focal length F5 of the filter 24 is infinity. The field of view of the camera device can be 120 degrees, the optical distortion is -34%, the total optical length TTL is 2.11 mm, and the overall dimensions are less than 1.1 mm * 1.1 mm in length and width. With the structure of the aspheric lens group 23 designed in this way, during the operation of the camera device, the first aspheric lens 231 can be used to receive wide-angle light, pre-correct spherical aberration and field curvature, the second aspheric lens 232 can be used to converge scattered light and form an achromatic combination with the first aspheric lens 231, the aperture 233 can intercept edge stray light, and the third aspheric lens 234 compresses the field curvature to match the CMOS plane, thereby achieving high-precision imaging.

[0045] It should be noted that all parameters and value ranges involved in the above-mentioned embodiments of the present application are merely exemplary and are used to analyze and illustrate the solution content of this embodiment, and should not be understood as limiting this solution.

[0046] In this embodiment, the projections of the lenses in the aspheric lens group 23 along the optical axis are polygonal or circular. The polygonal shape may be a rectangle, a square, a pentagon, a hexagon, etc., without limitation. Preferably, the projections of the lenses in the aspheric lens group 23 along the optical axis are circular.

[0047] In this embodiment, if Figure 3 As shown, the boss limiting structure 211 is further connected to an abutment platform 214 extending toward the optical axis, and the aspheric lens group 23 and the filter 24 abut against opposite sides of the abutment platform 214 respectively. That is, the boss limiting structure 211 and the abutment platform 214 form a stepped structure in the shell 21, the first step surface a of the boss limiting structure 211 and the wall surface of the shell 21 enclose a first assembly cavity 212, the second step surface b formed by the abutment platform 214 and the inner peripheral side of the boss limiting structure 211 enclose a second assembly cavity 2111, and the first sealing member 25 fills the gap between the plane mirror 22 and the first aspheric lens; the abutment platform 214 and the inner wall of the shell 21 enclose a third assembly cavity 213, the filter 24 is fixed in the third assembly cavity 213, and the end of the filter 24 facing away from the CMOS photosensitive chip 1 abuts against the abutment platform 214; the widths of the first assembly cavity 212 and the third assembly cavity 213 in the optical axis direction can be equal, that is, the projection contours of the plane mirror 22 and the filter 24 in the optical axis direction can coincide with the projection contour of the CMOS photosensitive chip 1. This lens assembly not only ensures the positioning stability of the lens, but also improves the integrity and aesthetics of the camera module.

[0048] In this embodiment, the housing 21 and the boss limiting structure 211 are an integral connector. Specifically, the housing 21, the boss limiting structure 211 and the abutting platform 214 can be obtained by an integral injection molding process, which has low processing cost and good structural stability.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A camera device, characterized in that: It includes a CMOS photosensitive chip and a lens assembly fixed to the CMOS photosensitive chip, the lens assembly includes a shell and a plane mirror, an aspheric lens group, and a filter arranged in the shell and arranged in sequence from the object side to the image side along the optical axis; the shell is provided with a first assembly cavity, a second assembly cavity and a third assembly cavity distributed along the optical axis, and the shell is also provided with a boss limiting structure, the boss limiting structure is located between the first assembly cavity and the third assembly cavity, the second assembly cavity is formed on the inner side of the boss limiting structure, the plane mirror is fixed in the first assembly cavity, the aspheric lens group is embedded in the second assembly cavity, and the filter is fixed in the third assembly cavity; the plane mirror, the shell and the aspheric lens group are packaged by a first sealing component, and the filter and the CMOS photosensitive chip are packaged by a second sealing component.

2. The imaging device according to claim 1, wherein The shell is a non-transparent body.

3. The imaging device according to claim 1, wherein The shell is one of a ceramic part, a metal part, an alloy part, and a plastic part.

4. The imaging device according to claim 1, wherein The plane mirror is a glass or plastic part, and / or the filter is a glass or plastic part.

5. The imaging device according to claim 1, wherein The aspheric lens group includes a concave lens and a convex lens.

6. The imaging device according to claim 5, wherein: The aspheric lens group further includes a stop.

7. The imaging device according to claim 6, wherein: The aspheric lens group includes a first aspheric lens, a second aspheric lens and a third aspheric lens arranged in sequence from the object side to the image side, and the aperture is arranged between the second aspheric lens and the third aspheric lens; the first aspheric lens has a concave surface on one side facing the second aspheric lens, and a flat surface on the other side; the second aspheric lens has convex surfaces on both sides; the third aspheric lens has a convex surface on the side close to the CMOS photosensitive chip, and the other side is a flat surface.

8. The imaging device according to claim 7, wherein: The first aspheric lens has negative optical power, and the second aspheric lens and the third aspheric lens each have positive optical power.

9. The imaging device according to claim 1, wherein The boss limiting structure is further connected to an abutment platform extending toward the optical axis, and the aspheric lens group and the filter are respectively abutted against two opposite sides of the abutment platform.

10. The imaging device according to claim 1, wherein The shell and the boss limiting structure are an integrated connecting piece.

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