Lens and camera module

Abstract

The utility model provides a lens and a camera module. The lens comprises a lens barrel, and a first lens, a first space ring, a second space ring and a second lens which are sequentially arranged in the lens barrel in a contact manner along an optical axis, the first lens is made of a glass material, and the second lens is made of a plastic material; the expansion coefficient of the first space ring is smaller than that of the first lens, the expansion coefficient of the second space ring is smaller than that of the second lens, and the expansion coefficient of the first lens is smaller than that of the second space ring. The first space ring and the second space ring with different expansion coefficients are arranged between the first lens made of glass and the second lens made of plastic, so that the deformation quantity of the first lens and the second lens made of different materials is reduced, the imaging performance of the lens at different temperatures is improved, and the temperature drift influence of the lens is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of optical imaging, in particular to a lens and a camera module. Background Art

[0002] Lenses have the function of transmitting light and are widely used in various imaging fields such as automotive, security, and intelligent manufacturing. As a precision optical component, the imaging performance of lenses is relatively sensitive to different temperatures. Existing lenses include lenses made of different materials. Lenses of different materials are separated and fixed in the lens barrel by the same spacer. Different materials have different expansion coefficients. When the external temperature changes, the amount of change of lenses of different materials is different. In current technology, it is difficult to adapt to the deformation of lenses of different materials by sandwiching lenses of different materials with spacers of the same material. This will cause the effective surface shape of different lenses to be squeezed and deformed, and then lead to changes in the surface shape and the radius of curvature of the lens (the imaging part is squeezed and affects the imaging), and ultimately lead to a decrease in the resolution of the lens and affect the imaging quality.

[0003] Therefore, it is necessary to provide an imaging solution that does not affect lenses of different materials under high and low temperature conditions. Utility Model Content

[0004] In response to the above problems, the purpose of the present invention is to provide a lens, comprising: a lens barrel, and arranged in contact with each other in sequence along the optical axis in the lens barrel: a first lens, a first spacer, a second spacer and a second lens; the first lens is made of glass, and the second lens is made of plastic; the expansion coefficient of the first spacer is smaller than the expansion coefficient of the first lens, the expansion coefficient of the second spacer is smaller than the expansion coefficient of the second lens, and the expansion coefficient of the first lens is smaller than the expansion coefficient of the second spacer.

[0005] Further preferably, one of the first spacer and the second spacer is provided with a limiting protrusion, and the other is provided with a limiting groove, and the limiting protrusion is arranged in the limiting groove.

[0006] Further preferably, the limiting protrusion and the limiting groove are both a full-circle annular structure.

[0007] Further preferably, the limiting protrusions include a plurality, and the corresponding limiting grooves also include a plurality, the plurality of limiting protrusions and the plurality of limiting grooves correspond one to one, and the limiting protrusions and the limiting grooves are evenly distributed around the optical axis.

[0008] Further preferably, the cross section of the limiting protrusion along the optical axis direction is an inverted trapezoid, and the cross section of the corresponding limiting groove along the optical axis direction is a trapezoid.

[0009] Further preferably, the limiting protrusion includes a limiting inclined surface and a supporting plane connected to each other, the supporting plane is perpendicular to the optical axis and has a diameter in the direction perpendicular to the optical axis is L, and the angle between the limiting inclined surface and the direction perpendicular to the optical axis is H, wherein L≥0.2mm, 40°≤H≤70°.

[0010] Further preferably, the expansion coefficient of the first spacer is close to the expansion coefficient of the first lens, and the expansion coefficient of the second spacer is close to the expansion coefficient of the second lens.

[0011] Further preferably, the first spacer is made of aluminum alloy or stainless steel.

[0012] More preferably, the second spacer is made of any one of polystyrene, polybutylene terephthalate, and polycarbonate.

[0013] On the other hand, the present invention provides a camera module, which includes a bracket and the above-mentioned lens, and the lens is mounted and fixed on the bracket.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] (1) By providing a first spacer and a second spacer with different expansion coefficients between a first lens made of glass and a second lens made of plastic, the deformation of the first lens and the second lens made of different materials is reduced, thereby improving the imaging performance of the lens at different temperatures. (2) A limiting protrusion is provided on one of the first spacer and the second spacer, and a limiting groove is provided on the other, to limit the assembly of the first spacer and the second spacer, thereby improving assembly efficiency and accuracy; and the limiting protrusion and the limiting groove can further prevent the first spacer and the second spacer from moving relative to each other when they expand and deform, thereby ensuring that the first spacer and the second spacer will not be misaligned due to changes in external temperature, thereby affecting the relative position of the first lens and the second lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0017] Figure 1 This is a cutaway view of the lens provided by the present invention;

[0018] Figure 2 This is a schematic diagram of the exploded structure of the first spacer and the second spacer provided by the utility model;

[0019] Figure 3 for Figure 1 Enlarged view of point A in the middle. DETAILED DESCRIPTION

[0020] To better understand the present invention, various aspects of the present invention will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrations of embodiments of the present invention and are not intended to limit the scope of the present invention in any way. Throughout this specification, like reference numerals refer to like elements. The expression "and / or" includes any and all combinations of one or more of the associated listed items.

[0021] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, which 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. Therefore, the above terms cannot be understood as limiting the present invention.

[0022] It should also be understood that the terms "comprises," "including," "having," "includes," and / or "comprising," when used in this specification, indicate the presence of the stated features, elements, and / or components, but do not preclude the presence or addition of one or more other features, elements, components, and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than modifying the individual elements in the list. In addition, when describing embodiments of the present invention, "may" is used to mean "one or more embodiments of the present invention." Furthermore, the term "exemplary" is intended to refer to an example or illustration.

[0023] Unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by those skilled in the art to which the present invention pertains. It should also be understood that terms (such as those defined in commonly used dictionaries) should be interpreted as having a meaning consistent with their meaning in the context of the relevant technology and will not be interpreted in an idealized or overly formal sense unless explicitly defined herein.

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments of the present invention can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] like Figures 1 to 3As shown, a lens comprises: a lens barrel 10, and: a first lens 20, a first spacer 30, a second spacer 40, and a second lens 50 arranged in contact with each other in sequence within the lens barrel 10 along an optical axis o. The first lens 20 is made of glass, and the second lens 50 is made of plastic. The expansion coefficient of the first spacer 30 is smaller than that of the first lens 20, the expansion coefficient of the second spacer 40 is smaller than that of the second lens 50, and the expansion coefficient of the first lens 20 is smaller than that of the second spacer 40. By providing the first spacer 30 and the second spacer 40, each having different expansion coefficients, between the glass first lens 20 and the plastic second lens 50, the deformation of the first lens 20 and the second lens 50 made of different materials is reduced, thereby improving the imaging performance of the lens at different temperatures. The glass material can be any of common materials such as H-ZPK5, H-ZLAF4LA, H-ZLAF10LA, D-ZLAF52N, H-ZLAF50, H-LAF4GT, and H-QK3L. The plastic material can be any of common materials such as T62R, OKP-V1, APL5015, EP5000, EP6000, and EP7000. It is understood that the expansion coefficient of the first lens 20 is less than the expansion coefficient of the second spacer 40, indicating that the materials of the first lens 20 and the first spacer 30 are clearly different from those of the second lens 50 and the second spacer 40. The first spacer 30, which contacts the glass first lens 20, and the second spacer 40, which contacts the plastic second lens 50, are clearly different in material selection. The choice of spacer material should be determined based on the material of the lens with which it contacts. This can reduce lens deformation and mitigate the impact of temperature drift on the lens.

[0026] It should be noted that the first lens 20 is made of glass, and the expansion coefficient of the first spacer 30 in contact with it is smaller than that of the first lens 20. Under low-temperature conditions, the contact and fit of the two (under the action of extrusion force) can reduce the shrinkage deformation of the first lens 20. Similarly, the second lens 50 is made of plastic, and the expansion coefficient of the second spacer 40 in contact with it is smaller than that of the second lens 50. Under low-temperature conditions, the contact and fit of the two (under the action of extrusion force) can reduce the shrinkage deformation of the second lens 50. Compared with the prior art, the present application takes into account that the second lens 50 made of plastic shrinks and deforms more, while the first lens 20 made of glass shrinks and deforms less. Under the premise that the deformation of the first lens 20 and the second lens 50 is different, if the same material spacer is used between the two, it will cause a large temperature drift of the entire lens. Therefore, different first spacers 30 and second spacers 40 made of materials with different expansion coefficients are used to match the first lens 20 and the second lens 50, respectively, which can effectively reduce the low-temperature shrinkage deformation of the first lens 20 and the second lens 50. It is understandable that in a high temperature environment, the first lens 20 and the second lens 50 expand at different rates, and the first spacer 30 and the second spacer 40 made of different expansion coefficients can also alleviate temperature drift.

[0027] In one embodiment, one of the first spacer 30 and the second spacer 40 is provided with a limiting protrusion 60, and the other is provided with a limiting groove 70, and the limiting protrusion 60 is provided in the limiting groove 70. One of the first spacer 30 and the second spacer 40 is provided with a limiting protrusion 60, and the other is provided with a limiting groove 70, which limits the assembly of the first spacer 30 and the second spacer 40, thereby improving assembly efficiency and accuracy; and the limiting protrusion 60 and the limiting groove 70 can further prevent the first spacer 30 and the second spacer 40 from moving relative to each other when they expand and deform, ensuring that the first spacer 30 and the second spacer 40 will not be misaligned due to changes in external temperature, affecting the relative position of the first lens 20 and the second lens 50; and since the first spacer 30 and the second spacer 40 have different expansion coefficients, the embedded design of the limiting protrusion 60 and the limiting groove 70 can further limit the deformation of the second spacer 40. Preferably, please refer to Figure 2 As shown, a limiting protrusion 60 is provided on the bottom surface of the first spacer 30, and a limiting groove 70 is provided on the top surface of the second spacer 40. The limiting protrusion 60 can limit the deformation of the second spacer 40 from being too large.

[0028] In one embodiment, the limiting protrusion 60 and the limiting groove 70 are both a full-circle annular structure. A full-circle annular structure facilitates mass production of the limiting protrusion 60 and the limiting groove 70, reducing process complexity.

[0029] In one embodiment, there are multiple limiting protrusions 60 and multiple corresponding limiting grooves 70. The multiple limiting protrusions 60 correspond to the multiple limiting grooves 70 one-to-one, and the limiting protrusions 60 and limiting grooves 70 are evenly distributed around the optical axis o. The multiple limiting protrusions 60 and the multiple limiting grooves 70 improve the connection stability of the first spacer 30 and the second spacer 40. The limiting protrusions 60 and the limiting grooves 70 are evenly distributed around the optical axis o, ensuring that the first spacer 30 and the second spacer 40 are uniformly stressed in the radial direction, thereby ensuring that the first lens 20 and the second lens 50 deform uniformly at all locations, thereby improving the imaging effect of the first lens 20 and the second lens 50, and ultimately improving the temperature drift improvement effect of the lens.

[0030] In one embodiment, the cross-section of the limiting protrusion 60 along the optical axis o is an inverted trapezoid, while the corresponding limiting groove 70 along the optical axis o is a trapezoid. The inverted trapezoidal and trapezoidal shapes of the limiting protrusion 60 and limiting groove 70 are assembled together to increase the contact area between them, improve the tightness of the fit between the first spacer 30 and the second spacer 40 in the direction perpendicular to the optical axis o, and reduce deformation of the second spacer 40.

[0031] Based on the above solution, the limiting protrusion 60 includes an interconnected limiting inclined surface 61 and a supporting plane 62. The supporting plane 62 is perpendicular to the optical axis o and has a diameter L in the direction perpendicular to the optical axis o. The angle H between the limiting inclined surface 61 and the direction perpendicular to the optical axis o is, where L ≥ 0.2 mm and 40° ≤ H ≤ 70°. The specified diameter L of the supporting plane 62 ensures a sufficiently large contact area between the limiting protrusion 60 and the first spacer 30 or second spacer 40 provided with the limiting groove 70, thereby ensuring the limiting capability of the limiting protrusion 60 and the limiting groove 70. The specified angle H between the limiting inclined surface 61 and the direction perpendicular to the optical axis o also ensures a sufficiently large contact area between the limiting protrusion 60 and the first spacer 30 or second spacer 40 provided with the limiting groove 70, thereby ensuring the limiting capability of the limiting protrusion 60 and the limiting groove 70. It also facilitates the machining of the limiting protrusion 60 and reduces the machining difficulty.

[0032] Further preferably, the expansion coefficient of the first spacer 30 is close to that of the first lens 20, and the expansion coefficient of the second spacer 40 is close to that of the second lens 50. The expansion coefficient of the first spacer 30 should not only be smaller than, but also be similar to, the expansion coefficient of the first lens 20, to prevent excessive correlation between the expansion coefficients of the first spacer 30 and the first lens 20, thereby reducing the significant radial force generated by both the first spacer 30 and the first lens 20, and thus reducing the deformation of the first lens 20. Similarly, the expansion coefficient of the second spacer 40 should not only be smaller than, but also be similar to, the expansion coefficient of the second spacer 40 and the second lens 50, to prevent excessive correlation between the expansion coefficients of the second spacer 40 and the second lens 50, thereby reducing the significant radial force generated by both the second spacer 40 and the second lens 50, and thus reducing the deformation of the second lens 50.

[0033] Further preferably, the first spacer 30 is made of aluminum alloy or stainless steel. Preferably, the first spacer 30 is made of AL6061 aluminum alloy or ACD12 aluminum alloy. AL6061 and ACD12 aluminum alloys offer moderate strength, good corrosion resistance, and excellent oxidation resistance, making them well-suited for the manufacture of the first spacer 30.

[0034] More preferably, the second spacer 40 is made of any one of polystyrene (PS), polybutylene terephthalate (PBT), and polycarbonate (PC). PS, PBT, and PC have excellent thermal stability, fatigue resistance, and ease of processing, making them suitable for manufacturing the second spacer 40.

[0035] On the other hand, the present invention provides a camera module, which includes a bracket and the above-mentioned lens, and the lens is mounted and fixed on the bracket.

[0036] The above-described embodiments merely represent several implementation methods of the present invention. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present invention. It should be noted that a person skilled in the art would be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be determined by the appended claims.

Claims

1. A lens, characterized in that: include: A lens barrel (10), and the following components, which are sequentially arranged in contact with each other along an optical axis in the lens barrel: a first lens (20), a first spacer (30), a second spacer (40), and a second lens (50); The first lens is made of glass, and the second lens is made of plastic; The expansion coefficient of the first spacer is smaller than the expansion coefficient of the first lens, the expansion coefficient of the second spacer is smaller than the expansion coefficient of the second lens, and the expansion coefficient of the first lens is smaller than the expansion coefficient of the second spacer.

2. The lens according to claim 1, wherein: One of the first spacer ring and the second spacer ring is provided with a limiting protrusion (60), and the other is provided with a limiting groove (70), wherein the limiting protrusion is provided in the limiting groove.

3. The lens according to claim 2, wherein: The limiting protrusion and the limiting groove are both a full-circle annular structure.

4. The lens according to claim 2, wherein: The limiting protrusions include a plurality of them, and the corresponding limiting grooves also include a plurality of them. The plurality of limiting protrusions and the plurality of limiting grooves correspond to each other one by one, and the limiting protrusions and the limiting grooves are evenly distributed around the optical axis.

5. The lens according to claim 2, wherein: The cross section of the limiting protrusion along the optical axis is an inverted trapezoid, and the cross section of the corresponding limiting groove along the optical axis is a trapezoid.

6. The lens according to claim 5, wherein: The limiting protrusion comprises a limiting inclined surface (61) and a supporting plane (62) connected to each other, the supporting plane is perpendicular to the optical axis and has a diameter L in a direction perpendicular to the optical axis, and an angle H between the limiting inclined surface and the direction perpendicular to the optical axis, wherein L≥0.2mm, 40°≤H≤70°.

7. The lens according to claim 1, wherein: The expansion coefficient of the first spacer is close to the expansion coefficient of the first lens, and the expansion coefficient of the second spacer is close to the expansion coefficient of the second lens.

8. The lens according to claim 1, wherein: The first spacer is made of aluminum alloy or stainless steel.

9. The lens according to claim 1, wherein: The second spacer is made of any one of polystyrene, polybutylene terephthalate, and polycarbonate.

10. A camera module, characterized in that: The invention comprises a bracket and the lens according to any one of claims 1 to 9, wherein the lens is mounted and fixed on the bracket.

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