Prime lens capable of compensating temperature drift, camera module and intelligent shooting equipment
By designing the light exit end suspended in the inner cavity of the lens barrel and the temperature floating compensation gap surrounding it, the interference of the lens body to the deformation of the lens seat is reduced, the temperature floating compensation effect of the lens barrel on the lens body is improved, and the problem of poor temperature floating compensation effect in the prior art is solved.
Patent Information
- Application Number
- CN202422049937.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-22
- Publication Date
- 2025-06-03
- Estimated Expiration
- 2034-08-22
AI Technical Summary
In the prior art, the contact area between the mirror seat and the lens main body is relatively large, causing the lens main body to interfere with the deformation of the mirror seat and reduce the temperature floating compensation effect of the mirror seat on the lens main body.
A temperature-wave-compensated fixed-focus lens is designed, which includes a lens barrel and a lens body. The light exit end of the lens body is suspended in the inner cavity of the lens barrel. The circumferential side wall and the inner wall of the lens barrel define a temperature-wave-compensated gap surrounding the light exit, reducing the contact area between the light exit end and the lens barrel, and improving the deformation degree of the lens barrel.
By reducing the resistance of the light exit end to the heat deformation of the lens barrel, the corresponding parts of the lens barrel can be fully heat-deformed, improving the temperature floating compensation effect of the lens barrel on the lens body and improving the imaging quality of the camera module.
Smart Images
Figure CN222939308U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of camera modules, and in particular to a fixed-focus lens with temperature drift compensation, a camera module and an intelligent shooting device. Background Art
[0002] The fixed-focus lens is one of the optical components of the camera module, which is used to allow light to pass through and focus the light so that the light reaches the chip sensor of the camera module, and finally the camera module forms an image. As Figure 1 shown, the fixed-focus lens generally includes a lens body and a lens base. The lens body is inserted into the inner cavity at the top of the lens base, and the circumferential side wall of the lens body abuts against the inner wall of the top of the lens base. The bottom end of the lens base is fixedly connected to the top surface of the circuit board of the camera module. A chip sensor is provided on the top surface of the circuit board, and the position of the chip sensor corresponds to that of the lens body. After the light passes through the lens body, the light is focused on the imaging surface of the chip sensor so that the chip sensor can form an image.
[0003] However, during the operation of the camera module, a large amount of heat is generated, resulting in an increase in the temperature of the lens body and expansion deformation, and further resulting in an increase in the focal length of the lens body. Therefore, the focus of the lens body moves down below the imaging surface of the chip sensor. This phenomenon is called temperature drift in the industry. As Figure 2 shown, when the temperature drift phenomenon occurs, after the light passes through the lens body, it cannot be focused on the imaging of the chip sensor, and finally the imaging effect of the camera module is poor.
[0004] Generally speaking, the lens base will also expand and deform under high temperature conditions. This expansion deformation will cause the whole lens body to move up slightly, so that the focus of the lens body will also move up slightly. In this way, the temperature drift of the lens body can be compensated, and the focus of the lens body can be moved back to the imaging surface of the chip sensor as much as possible.
[0005] However, at the same temperature, the expansion degree of the lens body is less than that of the lens base. In the prior art, due to the large contact area between the lens base and the lens body, the lens body will interfere with the deformation of the lens base, reduce the deformation ability of the lens base after being heated, and thus reduce the temperature drift compensation effect of the lens base on the lens body.
[0006] For the above reasons, it is necessary to provide a technical solution with temperature drift compensation to improve the temperature drift compensation effect of the lens base on the lens body. Utility Model Content
[0007] The utility model provides a fixed-focus lens with temperature drift compensation, a camera module and an intelligent shooting device, which can improve the temperature drift compensation effect of the lens barrel on the lens body.
[0008] The technical solution adopted by the utility model is as follows:
[0009] A fixed-focus lens with temperature drift compensation includes a lens barrel and a lens body. The lens body at least includes a middle connection section and a light-emitting end arranged in sequence from top to bottom along its own optical axis. The top port of the lens barrel is sleeved on the middle connection section. The light-emitting end is suspended in the inner cavity of the lens barrel, and a temperature drift compensation gap surrounding the optical axis of the light-emitting end is defined by the circumferential side wall of the light-emitting end and the inner wall of the lens barrel. The temperature drift compensation gap extends downward from the middle connection section.
[0010] In one embodiment, the vertical distance between the top end of the temperature drift compensation gap and the bottom surface of the lens barrel is the ratio of the focal length change amount of the lens body caused by temperature change to the material expansion coefficient of the lens barrel.
[0011] In one embodiment, the middle connection section is threadedly connected or adhesively connected to the top port of the lens barrel.
[0012] In one embodiment, the light-emitting end includes an inclined extension portion; the inclined extension portion extends downward from the middle connection section and inclines away from the inner wall of the lens barrel.
[0013] In one embodiment, the middle connection section and the lens barrel are integrally formed.
[0014] In one embodiment, the width of the temperature drift compensation gap gradually increases from the middle connection section to the bottom end surface of the light-emitting end.
[0015] In one embodiment, the lens barrel includes an upper half section and a lower half section arranged in sequence from top to bottom along its own axis. The diameter of the upper half section is smaller than that of the lower half section. The light-emitting end is located in the inner cavity of the upper half section.
[0016] An imaging module at least includes a circuit board, a chip, and the above-mentioned fixed-focus lens with temperature drift compensation. The bottom end of the lens barrel is fixedly connected to the top surface of the circuit board. The chip is arranged on the top surface of the circuit board and is located inside the lens barrel. The chip is spaced from the lens body and corresponds to the position of the lens body.
[0017] An intelligent shooting device includes the above-mentioned imaging module.
[0018] The beneficial effect of the present utility model is:
[0019] In the present application, the light-emitting end is suspended in the inner cavity of the lens barrel, and a temperature drift compensation gap surrounding the light-emitting end is formed between the circumferential side wall of the light-emitting end and the inner wall of the lens barrel. By this means, the contact area between the light-emitting end and the lens barrel can be reduced, thereby reducing the resistance of the light-emitting end to the heat deformation process of the lens barrel, enabling the corresponding part of the lens barrel to the temperature drift compensation gap to be fully heated and deformed, improving the deformation degree of the lens barrel, and thus improving the temperature drift compensation effect of the lens barrel on the lens body. Description of the Drawings
[0020] The accompanying drawings are used to provide a further understanding of the present utility model and form a part of the specification, and are used together with the following specific embodiments to explain the present utility model, but should not constitute a limitation to the present utility model. In the accompanying drawings,
[0021] Figure 1 is a schematic structural diagram of the prior art;
[0022] Figure 2 is a schematic diagram of the temperature drift state of the prior art;
[0023] Figure 3 is a schematic structural diagram of an embodiment of the present utility model;
[0024] Figure 4 is a schematic structural diagram of another embodiment of the present utility model.
[0025] Explanation of the reference numerals in the accompanying drawings:
[0026] 11. Lens body; 12. Lens base; 13. Chip sensor; 14. Circuit board;
[0027] 20. Lens body; 21. Light incident end; 22. Middle connection section; 23. Light exit end; 231. Inclined extension part;
[0028] 30. Lens barrel; 31. Upper half section; 32. Lower half section;
[0029] 40. Circuit board;
[0030] 50. Chip;
[0031] 60. Temperature difference compensation gap. Specific embodiments
[0032] The following will describe in detail the specific embodiments of the present utility model with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present utility model, and are not used to limit the present utility model.
[0033] This embodiment discloses an intelligent shooting device, which can be an electronic device with a shooting function such as a mobile phone, a bracelet, a drone, a sweeping robot, etc. The intelligent shooting device of this embodiment includes a camera module, and the camera module at least includes a chip 50, a circuit board 40, and a fixed-focus lens capable of temperature drift compensation. The chip 50 is arranged on the top surface of the circuit board 40 to receive light and generate relevant image signals. The circuit board 40 integrates a control unit for controlling the operation of the camera module and related control circuits. Of course, the camera module also includes other common components in this industry, which will not be listed one by one here.
[0034] In this embodiment, the fixed-focus lens includes a lens barrel 30 and a lens body 20. The lens body 20 is suspended above a circuit board 40 through the lens barrel 30.
[0035] In this embodiment, the lens body 20 is an integrally formed light-transmitting optical component, or can also be a combined optical component. The lens body 20 is used to focus light on the imaging surface of the chip 50 (i.e., the top surface of the chip 50), so that the chip 50 generates relevant image signals. As Figure 3 shown, the lens body 20 includes a light incident end 21, a middle connection section 22, and a light exit end 23 arranged in sequence from top to bottom along its own optical axis F. The light incident end 21 is exposed above the top port of the lens barrel 30. The top port of the lens barrel 30 is sleeved on the middle connection section 22, and the light exit end 23 is suspended in the inner cavity of the lens barrel 30. In other embodiments, the top port of the lens barrel 30 can be connected to both the light incident end 21 and the middle connection section 22 at the same time. In this way, the light incident end 21 can also be hidden inside the lens barrel 30, making the appearance of the fixed-focus lens neater.
[0036] In this embodiment, the circumferential side wall of the light exit end 23 and the inner wall of the lens barrel 30 define a temperature drift compensation gap 60 surrounding the optical axis of the light exit end 23. The temperature drift compensation gap 60 extends downward from the middle connection section 22. Compared with the prior art, in this embodiment, by means of the temperature drift compensation gap 60, the contact area between the light exit end 23 and the lens barrel 30 can be reduced, thereby reducing the resistance generated by the light exit end 23 to the heat deformation process of the lens barrel 30, so that the side wall of the lens barrel 30 corresponding to the temperature drift compensation gap 60 can be fully deformed by heat, improving the deformation degree of the lens barrel 30, and thus improving the temperature drift compensation effect of the lens barrel 30 on the lens body 20.
[0037] As Figure 3 shown, in this embodiment, the vertical distance A between the top end of the temperature drift compensation gap 60 and the bottom surface of the lens barrel 30 is the ratio of the focal length change amount △F of the lens body 20 caused by temperature change to the material expansion coefficient K of the lens barrel 30, that is, △F = A×K. Therefore, the temperature drift compensation effect of the lens barrel 30 on the lens body 20 can be made to reach the best state as much as possible.
[0038] Next, the structure of the fixed-focus lens in this embodiment will be further elaborated.
[0039] In this embodiment, the lens barrel 30 includes an upper half section 31 and a lower half section 32 arranged in sequence along its own axis. The diameter of the upper half section 31 is smaller than that of the lower half section 32, and the light exit end 23 is located inside the inner cavity of the upper half section 31. In this embodiment, the lower half section 32 of the lens barrel 30 has a larger diameter, so the bottom port of the lower half section 32 can more easily cover the chip 50, reducing the probability of the bottom port of the lower half section 32 squeezing the chip 50 during the assembly process. Of course, in other embodiments, the overall structure of the lens barrel 30 can be in the shape of a straight barrel, and the diameters of its upper half section 31 and lower half section 32 are the same. The manufacturing process of the lens barrel 30 in this embodiment is more convenient and fast.
[0040] In this embodiment, the middle connecting section 22 is threadedly connected or adhesively connected to the top port of the lens barrel 30, preferably adhesively connected. Such a connection method does not require machining threads on the circumferential side wall of the middle connecting section 22 and the inner wall of the lens barrel 30, reducing the manufacturing cost.
[0041] In this embodiment, the light exit end 23 includes an inclined extension portion 231; the inclined extension portion 231 extends downward from the middle connecting section 22 and inclines away from the inner wall of the lens barrel 30. Such a structural method can increase the width of the temperature drift compensation gap 60, thereby increasing the deformation upper limit of the lens barrel 30.
[0042] In another embodiment, as Figure 4 shown, the middle connecting section 22 and the lens barrel 30 are integrally formed. Such a solution has a greater manufacturing difficulty, but better structural consistency.
[0043] Furthermore, the lens barrel 30 includes an upper half section 31 and a lower half section 32 arranged in sequence along its own axis. The diameter of the upper half section 31 is smaller than that of the lower half section 32. The upper half section 31 is generally in the shape of a frustum of a cone, preferably a frustum of a circular cone. The lower plate section 32 is generally in the shape of a cylinder.
[0044] The lens body 20 includes a light incident end 21, a middle connecting section 22, and a light exit end 23. The light incident end 21 is located above the upper half section 31, and the diameter of the light incident end 21 is larger than that of the upper half section 31. The middle connecting section 22 is connected to the upper end of the lens barrel 30. The light exit end 23 is suspended inside the inner cavity of the lens barrel 30. The temperature drift compensation gap 60 is located between the circumferential side wall of the light exit end 23 and the inner wall of the lens barrel 30.
[0045] Furthermore, the middle connecting section 22 and the lens barrel 30 are integrally formed.
[0046] Specifically, in the solution where the lens body 20 is an integrally formed light-transmitting optical member, the lens body 20 and the lens barrel 30 are an integrally formed whole. When manufacturing this whole, a cutting process or a processing process specific to this technical field can be used to process the blank of this whole, so that the whole blank finally forms the lens body 20, the lens barrel 30, and the temperature drift compensation gap 60.
[0047] Specifically, in the solution where the lens body 20 is a combined optical member, the light incident end 21, the middle connection section 22, and the light exit end 23 are independent members. For example, some of the light incident end 21, the middle connection section 22, and the light exit end 23 are lens members that can be used independently, or all of them are lens members that can be used independently. Among them, the middle connection section 22 and the lens barrel 30 are integrally formed, and the light incident end 21 and the light exit end 23 are respectively fixed to the top and bottom ends of the middle connection section 22.
[0048] Furthermore, the width of the temperature drift compensation gap 60 gradually increases from the middle connection section 22 to the bottom end face of the light exit end 23. The specific shape of the temperature drift compensation gap 60 is not limited here, and the structural shape of the temperature drift compensation gap 60 can also be adaptively changed based on actual needs.
[0049] In the drawings, for clarity, the dimensions and relative dimensions of layers and regions are exaggerated. It should be understood that when an element such as a layer, a region, or a substrate is referred to as "formed on", "disposed on", or "located on" another element, the element can be directly disposed on the said another element, or there can also be an intermediate element. On the contrary, when an element is referred to as "directly formed on" or "directly disposed on" another element, there is no intermediate element.
[0050] In this article, the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the sake of clear expression of the technical solution and convenient description. Therefore, it cannot be understood as a limitation to the present utility model.
[0051] In this article, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion. In addition to including the listed elements, it may also include other elements not specifically listed. As long as it does not violate the idea of the present utility model creation, any combination of various different embodiments of the present utility model should be regarded as the content disclosed by the present utility model; within the scope of the technical concept of the present utility model, various simple modifications of the technical solution and any combination of different embodiments that do not violate the idea of the present utility model creation should be within the protection scope of the present utility model.
Claims
1. A fixed-focus lens capable of temperature drift compensation, comprising a lens barrel (30) and a lens body (20), wherein the lens body (20) at least comprises a middle connecting section (22) and a light emitting end (23) arranged in sequence from top to bottom along its own optical axis; the top end of the lens barrel (30) is sleeved on the outer periphery of the middle connecting section (22); characterized in that: The light emitting end (23) is suspended in the inner cavity of the lens barrel (30), and a temperature drift compensation gap (60) surrounding the optical axis of the light emitting end (23) is defined by the circumferential side wall of the light emitting end (23) and the inner wall of the lens barrel (30). The temperature drift compensation gap (60) extends downward from the middle connecting section (22).
2. The fixed-focus lens capable of temperature drift compensation according to claim 1, characterized in that: The vertical distance (A) between the top of the temperature drift compensation gap (60) and the bottom surface of the lens barrel (30) is the ratio of the focal length change (ΔF) of the lens body (20) caused by temperature change to the material expansion coefficient (K) of the lens barrel (30).
3. The fixed-focus lens capable of temperature drift compensation according to claim 1, wherein: The middle connecting section (22) is threadedly connected or adhesively connected to the top end of the lens barrel (30).
4. The fixed-focus lens capable of temperature drift compensation according to claim 3, characterized in that: The light emitting end (23) comprises an inclined extension portion (231); the inclined extension portion (231) extends obliquely downward from the middle connecting section (22) and away from the inner wall of the lens barrel (30).
5. The fixed-focus lens capable of temperature drift compensation according to claim 1, characterized in that: The middle connecting section (22) and the lens barrel (30) are integrally formed.
6. The fixed-focus lens capable of temperature drift compensation according to claim 5, characterized in that: The width of the temperature drift compensation gap (60) gradually increases from the middle connecting section (22) to the bottom end surface of the light emitting end (23).
7. The fixed-focus lens capable of temperature drift compensation according to claim 1, wherein: The lens barrel (30) comprises an upper section (31) and a lower section (32) which are arranged in sequence from top to bottom along its own axis, the diameter of the upper section (31) being smaller than the diameter of the lower section (32); and the light emitting end (23) is located in the inner cavity of the upper section (31).
8. A camera module, characterized in that: The invention at least comprises a circuit board (40), a chip (50) and a fixed-focus lens capable of temperature drift compensation as claimed in any one of claims 1 to 7; the bottom end of the lens barrel (30) is fixedly connected to the top surface of the circuit board (40); the chip (50) is arranged on the top surface of the circuit board (40) and is located in the lens barrel (30); the chip (50) is spaced apart from the lens body (20) and corresponds to the position of the lens body (20).
9. An intelligent photographing device, characterized in that: Comprising the camera module as described in claim 8.