Lens assembly and electronic device

Abstract

The application discloses a lens assembly and an electronic device. The lens assembly comprises a lens barrel, a lens group and a pressing sheet. The lens barrel is provided with a first step portion and a second step portion at two ends along an axial direction of the lens barrel. The lens group is arranged between the first step portion and the second step portion. The pressing sheet is in a ring structure with a central circular hole. The pressing sheet comprises a mounting portion and an elastic portion. The elastic portion is connected to one side of the mounting portion close to the central circular hole, and the elastic portion and the mounting portion are connected in a bending mode. The mounting portion is provided with a connecting groove. The mounting portion is arranged on one side of the first step portion away from the second step portion. The elastic portion abuts against the lens group and applies an elastic force to the lens group. The lens barrel is provided with a boss portion protruding from the first step portion. The boss portion is embedded in the connecting groove, and the boss portion and the connecting groove are connected in a hot riveting mode.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electronic products, and more particularly, to a lens assembly and an electronic device. BACKGROUND

[0002] In recent years, with the vigorous development of science and technology, projection technology has become mature, and the application field of projection equipment has become more and more extensive. For example, it is applied to commercial fields such as conference explanation, tour exhibition and promotion activities, to educational fields such as school teaching and academic discussion, and to home fields such as home theaters. The projection equipment is internally provided with a lens for adjusting a light beam, and a lens barrel for mounting the lens.

[0003] When the projection equipment works for a long time, the temperature of the lens barrel is increased by light and slightly deformed, so that the lens is displaced. The deformation of the lens barrel and the displacement of the lens will cause the light path to lose the best focusing imaging effect. This phenomenon is called thermal defocus or thermal defocus phenomenon.

[0004] Therefore, it is necessary to provide a new technical solution to at least alleviate the thermal defocus problem of the projection equipment. SUMMARY

[0005] An object of the present application is to provide a new technical solution of a lens assembly and an electronic device.

[0006] According to a first aspect of the present application, a lens assembly is provided, comprising:

[0007] a lens barrel, the lens barrel is provided with a first step portion and a second step portion at two ends of the axial direction thereof, respectively;

[0008] a lens group, the lens group is arranged between the first step portion and the second step portion;

[0009] a lens pressing piece, the lens pressing piece is an annular structure with a central circular hole, the lens pressing piece comprises a mounting portion and an elastic portion, the elastic portion is connected to one side of the mounting portion close to the central circular hole, and the elastic portion and the mounting portion are connected by bending; the mounting portion is provided with a connecting through slot;

[0010] the mounting portion is arranged on the side of the first step portion away from the second step portion, the elastic portion abuts against the lens group and applies an elastic force to the lens group;

[0011] the lens barrel is provided with a boss portion protruding at the first step portion, the boss portion is embedded in the connecting through slot, and the boss portion and the mounting portion are hot riveted.

[0012] Optionally, the connecting grooves are in the shape of circular arcs; the connecting grooves are arranged in at least three, and the at least three connecting grooves are distributed on the same circle; the boss part is arranged in a shape and number matched with the connecting grooves.

[0013] Optionally, the circle on which the at least three connecting grooves are located is a concentric circle of the central circular hole.

[0014] Optionally, the elastic part is provided with a deformation gap.

[0015] Optionally, the deformation gap is arranged in at least three, and the at least three deformation gaps are evenly distributed around the center of the central circular hole.

[0016] Optionally, the lens assembly further comprises a light-shielding ring connected to the side of the pressing sheet away from the lens group; the light-shielding ring covers and shields the deformation gap.

[0017] Optionally, the light-shielding ring has a first edge part towards the center of the central circular hole, and the elastic part has a second edge part towards the center of the central circular hole; the second edge part is located on the side of the first edge part away from the center of the central circular hole.

[0018] Optionally, the light-shielding ring is provided with an avoiding groove for avoiding the boss part.

[0019] Optionally, the lens group comprises lens bodies and spacers, the lens bodies are arranged in multiple, and the multiple lens bodies are arranged in layers between the first step part and the second step part; one spacer is arranged between any two adjacent lens bodies.

[0020] Optionally, the lens body and the lens barrel are in clearance fit; the elastic force applied by the elastic part to the lens group is greater than the friction force between the lens body and the lens barrel.

[0021] According to a second aspect of the present application, an electronic device is provided, which comprises the lens assembly according to the first aspect.

[0022] In the lens assembly provided in the embodiments of the present application, the lens group is fixed in the axial direction by the pressing sheet, so that the lens group is always in a compressed state in the axial direction, and the position variation of the lens group caused by thermal expansion of the lens barrel is eliminated, thereby reducing the degree of thermal defocus.

[0023] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments thereof, taken in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0025] Figure 1 Fig. 1 shows a schematic diagram of the overall structure of a lens assembly according to the present application;

[0026] Figure 2 Fig. 2 shows a schematic diagram of the cross-sectional structure of a lens assembly according to the present application;

[0027] Figure 3 Fig. 3 shows a schematic diagram of the structure of a pressing plate in a lens assembly according to the present application;

[0028] Figure 4 Fig. 4 shows a schematic diagram of a partial enlarged view of a lens assembly according to the present application.

[0029] BRIEF DESCRIPTION OF DRAWINGS

[0030] 1. lens assembly; 10. lens barrel; 100. boss portion; 101. first step portion; 102. second step portion; 11. lens group; 111. lens body; 112. spacer ring; 12. pressing plate; 120. central circular hole; 121. mounting portion; 1210. connecting through slot; 122. elastic portion; 1220. deformation gap; 13. diaphragm; 130. avoidance slot. DETAILED DESCRIPTION

[0031] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. If not specifically stated, it should be noted that the relative arrangement of the components and steps illustrated in these embodiments, numerical expressions, and numerical values are not limiting to the scope of the present application.

[0032] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way limiting to the scope of the application and its applications or uses.

[0033] Techniques, methods, and apparatus known to those of ordinary skill in the relevant art can not be discussed in detail herein. However, where appropriate, such techniques, methods, and apparatus should be considered as part of the description of the present application.

[0034] In all of the examples shown and discussed herein, any specific values should be interpreted as merely illustrative of the examples and not as a limitation thereon. Thus, other examples of the exemplary embodiments can have different values.

[0035] It should be noted that like reference numerals and letters refer to like items throughout the drawings, and once an item is defined in one drawing, it is not necessary to discuss it further in subsequent drawings.

[0036] SUMMARY Figures 1-4As shown, according to one embodiment of the present application, a lens assembly 1 is provided, which comprises a lens barrel 10, a lens group 11 and a pressing plate 12, the lens barrel 10 is provided with a first step portion 101 and a second step portion 102 at two ends thereof along an axial direction thereof; the lens group 11 is arranged between the first step portion 101 and the second step portion 102;

[0037] The pressing plate 12 is annular structure with a central circular hole 120, the pressing plate 12 comprises a mounting portion 121 and an elastic portion 122, the elastic portion 122 is connected to a side of the mounting portion 121 close to the central circular hole 120, and the elastic portion 122 is connected to the mounting portion 121 by bending; the mounting portion 121 is provided with a connecting through slot 1210;

[0038] The mounting portion 121 is arranged at a side of the first step portion 101 away from the second step portion 102, the elastic portion 122 abuts against the lens group 11 and applies elastic force to the lens group 11; the lens barrel 10 is provided with a boss portion 100 protruding at the first step portion 101, the boss portion 100 is embedded in the connecting through slot 1210, and the boss portion 100 is hot riveted to the mounting portion 121.

[0039] In the lens assembly provided by the embodiment of the present application, the lens group 11 is arranged between the first step portion 101 and the second step portion 102 of the lens barrel 10, and the lens group 11 is pressed by arranging the pressing plate 12 at a side of the first step portion 101 away from the second step portion 102. Specifically, the mounting portion 121 of the pressing plate 12 is hot riveted to the boss portion 100 protruding at the first step portion 101 through the connecting through slot 1210, and the hot riveting operation is convenient and the connection is firm. The elastic portion 122 of the pressing plate 12 applies elastic pressure to the lens group 11 along the axial direction of the lens barrel 10, which is also the axial direction of the lens group 11. Thus, the lens group 11 is fixed along the axial direction, and the lens group 11 is always in a pressed state along the axial direction, the position variation of the lens group 11 caused by thermal expansion of the lens barrel 10 is eliminated, and the degree of thermal defocus is reduced.

[0040] Optionally, the pressing plate 12 is made of metal, i.e., the mounting portion 121 and the elastic portion 122 are made of metal; the mounting portion 121 and the elastic portion 122 are integrally formed, and the pressing plate 12 is bent near the central circular hole 120 to form the elastic portion 122, and the bending structure between the mounting portion 121 and the elastic portion 122 enables the elastic portion 122 to elastically deform.

[0041] Reference Figure 3As shown, in one embodiment, the connecting grooves 1210 are in the shape of arcs; at least three connecting grooves 1210 are provided and are distributed on the same circumference; the boss part 100 is provided in a shape and number matching the connecting grooves 1210.

[0042] In this specific example, at least three arc-shaped connecting grooves 1210 are provided on the mounting part 121 of the pressing plate 12 and are connected with the matching boss part 100, so that the mounting of the pressing plate 12 on the lens barrel 10 is very stable and reliable.

[0043] Optionally, three connecting grooves 1210 and three boss parts 100 are provided, and the circumference on which the three connecting grooves 1210 are located is a concentric circle of the central circular hole 120. In this way, the elastic force applied by the pressing plate 12 to the lens group 11 is more uniform; and the provision of three connecting grooves 1210 and three boss parts 100 does not make the processing and mounting process too complex, while ensuring the connection effect without increasing the production cost.

[0044] Referring to Figure 3 As shown, in one embodiment, the elastic part 122 is provided with a deformation gap 1220.

[0045] In this specific example, the provision of the deformation gap 1220 is beneficial to control the elastic force applied by the elastic part 122 to the lens group 11, preventing the elastic force from being too large to damage the riveting connection between the boss part 100 and the connecting groove 1210. Moreover, while the elastic part 122 exerts elastic pressure on the lens group 11, it will itself be elastically deformed, and the presence of the deformation gap 1220 provides a deformation space for the elastic deformation of the elastic part 122.

[0046] Referring to Figure 3 As shown, in one embodiment, the number of the deformation gaps 1220 is at least three, and at least three of the deformation gaps 1220 are uniformly distributed around the center of the central circular hole 120.

[0047] For example, three deformation gaps 1220 are uniformly distributed around the center of the central circular hole 120; in this way, it is beneficial to make the elastic part 122 elastically deform more uniformly, and at the same time, the elastic force applied by the elastic part 122 to the lens group 11 is more uniform.

[0048] Referring to Figure 1 , Figure 4 As shown, in one embodiment, the lens assembly further comprises a light-shielding ring 13 connected to the side of the pressing plate 12 away from the lens group 11; the light-shielding ring 13 covers and blocks the deformation gap 1220.

[0049] In this specific example, since the existence of the deformation gap 1220 will cause light leakage to affect the imaging effect, the light shield ring 13 is arranged to cover the deformation gap 1220 to prevent the occurrence of light leakage. Optionally, the material of the light shield ring 13 is selected to be light-shielding milar.

[0050] Referring to Figure 3 In one embodiment, the light shield ring 13 has a first edge portion towards the center of the center hole 120, and the elastic portion 122 has a second edge portion towards the center of the center hole 120; the second edge portion is located on the side of the first edge portion away from the center of the center hole 120.

[0051] Since the elastic portion 122 will be elastically deformed when it exerts elastic pressure on the lens group 11, the aperture of the center hole 120 defined by the second edge portion of the elastic portion 122 will change, which will cause difficulty in determining the clear aperture of the lens assembly 1. Therefore, in this specific example, the first edge portion of the light shield ring 13 is arranged to pass the second edge portion of the elastic portion 122, so that the aperture defined by the first edge portion of the light shield ring 13 is the clear aperture of the lens assembly 1. In other words, no matter how the elastic portion 122 deforms, the second edge portion of the elastic portion 122 is within the range of the light shield ring 13 and does not exceed the first edge portion of the light shield ring 13.

[0052] Referring to Figure 4 In one embodiment, the light shield ring 13 is provided with a relief groove 130 for avoiding the boss portion 100.

[0053] In this specific example, since the boss portion 100 protrudes from the mounting portion 121 of the pressing plate 12, it is necessary to provide the light shield ring 13 with a relief groove 130 to avoid the boss portion 100. Optionally, the boss portion 100 is arranged flush with the light shield ring 13, so that the structure of the entire lens assembly 1 is more flat.

[0054] Referring to Figure 2 In one embodiment, the lens group 11 includes lens bodies 111 and spacers 112, the lens bodies 111 are provided in plurality, and the plurality of lens bodies 111 are arranged in layers between the first step portion 101 and the second step portion 102; one spacer 112 is arranged between any two adjacent lens bodies 111.

[0055] In this specific example, the spacers 112 and the curved surfaces of the lens bodies 111 are used to realize auxiliary centering, further ensuring that the lens group 11 is always in a compressed state, thereby helping to eliminate the positional variation of the lens bodies 111 caused by thermal expansion of the lens barrel 10, thereby reducing the degree of thermal defocus. Optionally, the spacers 112 are made of metal.

[0056] In one embodiment, the lens body 111 and the lens barrel 10 are in clearance fit; the elastic force applied by the elastic part 122 to the lens group 11 is greater than the friction force between the lens body 111 and the lens barrel 10.

[0057] In this specific example, a reasonable clearance is provided between the lens body 111 and the lens barrel 10, which clearance depends on the requirement of optical design for decentration. At the same time, the elastic force applied by the elastic part 122 to the lens group 11 is greater than the friction force between the lens body 111 and the lens barrel 10, which further ensures that when the lens barrel 10 is heated to expand, the lens body 111 will not be pulled to displace by the lens barrel 10 under the elastic pressure of the elastic part 122, because the elastic pressure of the elastic part 122 will overcome the friction force between the lens body 111 and the lens barrel 10 to fix the lens body 111 in the original position.

[0058] Optionally, the lens barrel 10 can be cuboid or cylindrical.

[0059] According to another embodiment of the present application, an electronic device is provided, which includes the lens assembly 1 as described above. The electronic device can be, for example, a DLP (Digital Light Processing).

[0060] Although some specific embodiments of the present application have been described in detail by examples, those skilled in the art should understand that the above examples are only for illustration, but not for limiting the scope of the present application. Those skilled in the art should understand that the above embodiments can be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A lens assembly, characterized in that, The lens assembly includes: The lens barrel (10) has a first step portion (101) and a second step portion (102) respectively at both ends along its axial direction; Lens assembly (11), wherein the lens assembly (11) is disposed between the first step portion (101) and the second step portion (102); A pressure plate (12) is an annular structure with a central circular hole (120). The pressure plate (12) includes a mounting part (121) and an elastic part (122). The elastic part (122) is connected to the side of the mounting part (121) near the central circular hole (120), and the elastic part (122) and the mounting part (121) are bent together. The mounting part (121) has a connecting groove (1210). The mounting part (121) is disposed on the side of the first step part (101) away from the second step part (102), and the elastic part (122) abuts against the lens group (11) and applies elastic force to the lens group (11) in the axial direction, thereby fixing the lens group (11) in the axial direction and keeping the lens group (11) in a pressed state in the axial direction at all times. The lens barrel (10) has a boss (100) protruding from the first step (101), the boss (100) is embedded in the connecting through groove (1210), and the boss (100) is thermally riveted to the mounting part (121). The lens assembly (11) includes a lens body (111) and a spacer (112). Multiple lens bodies (111) are provided, and multiple lens bodies (111) are stacked between the first step portion (101) and the second step portion (102). A spacer (112) is sandwiched between any two adjacent lens bodies (111).

2. The lens assembly according to claim 1, characterized in that, The connecting slot (1210) is arc-shaped; at least three connecting slots (1210) are provided, and at least three connecting slots (1210) are distributed on the same circumference; the shape and number of the boss (100) are matched with the connecting slots (1210).

3. The lens assembly according to claim 2, characterized in that, At least three of the connecting slots (1210) are concentric with the central hole (120).

4. The lens assembly according to claim 1, characterized in that, The elastic part (122) has a deformation notch (1220).

5. The lens assembly according to claim 4, characterized in that, The number of deformation notches (1220) is at least three, and the at least three deformation notches (1220) are evenly distributed around the center of the central circular hole (120).

6. The lens assembly according to claim 4, characterized in that, The lens assembly also includes a light-shielding ring (13), which is connected to the side of the pressure plate (12) away from the lens group (11); the light-shielding ring (13) covers and blocks the deformation notch (1220).

7. The lens assembly according to claim 6, characterized in that, The light-shielding ring (13) has a first edge portion facing the center of the central circular hole (120), and the elastic portion (122) has a second edge portion facing the center of the central circular hole (120); the second edge portion is located on the side of the first edge portion away from the center of the central circular hole (120).

8. The lens assembly according to claim 6, characterized in that, The light-shielding ring (13) has a relief groove (130) for avoiding the boss portion (100).

9. The lens assembly according to claim 1, characterized in that, The lens body (111) and the lens barrel (10) are fitted with a clearance; the elastic force applied by the elastic part (122) to the lens assembly (11) is greater than the frictional force between the lens body (111) and the lens barrel (10).

10. An electronic device, characterized in that, The electronic device includes a lens assembly (1) as claimed in any one of claims 1-9.

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