Lens assembly and electronic equipment

Abstract

The present application discloses a lens assembly and an electronic device, wherein the lens assembly includes a lens barrel, a lens group, a pressing piece and an elastic member, wherein the lens barrel has an accommodating cavity and is provided with a first step portion and a second step portion; the lens group is arranged in the accommodating cavity and is located between the first step portion and the second step portion; the pressing piece is an annular structure with a central circular hole, and is arranged on the first step portion; a glue groove is provided on the pressing piece; the pressing piece and the first step portion are bonded and connected by light-curing glue, ultraviolet light pre-cures the light-curing glue through the glue groove, and a portion of the light-curing glue forms a connecting glue column at the glue groove; the elastic member is connected to the bottom of the pressing piece facing the lens group, the elastic member abuts against the lens group and applies elastic force to the lens group.

Description

Technical Field

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

[0002] In recent years, with the rapid development of science and technology, projection technology has matured, and the application of projection equipment has become increasingly diverse. For example, it is used in commercial fields such as conference presentations, road shows, and promotional activities, in educational fields such as school lectures and academic discussions, and in domestic areas such as home theaters. The projector is equipped with a lens for adjusting the light beam and a lens barrel for mounting the lens.

[0003] When the projection equipment has been working for a long time, the light causes the temperature of the lens barrel to rise and slight deformation occurs, resulting in lens shift. The deformation of the lens barrel and the shift of the lens will cause the light path to lose the optimal focusing and imaging effect. We call this phenomenon thermal defocus or thermal defocus.

[0004] In view of this, it is necessary to provide a new technical solution to at least alleviate the thermal defocus problem of the projection device. Summary of the Invention

[0005] One purpose of this application is to provide a new technical solution for 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 having a receiving cavity therein and provided with a first step portion and a second step portion;

[0008] a lens assembly, the lens assembly being disposed in the accommodating cavity and located between the first step portion and the second step portion;

[0009] A pressing sheet, the pressing sheet being an annular structure with a central circular hole, the pressing sheet being disposed on the first step portion; a glue receiving groove being formed on the pressing sheet; the pressing sheet and the first step portion being bonded together by light-curing adhesive, the light-curing adhesive being pre-cured by ultraviolet light through the glue receiving groove, and a portion of the light-curing adhesive forming a connecting adhesive column at the glue receiving groove;

[0010] An elastic member is connected to the bottom of the pressing plate facing the lens group, and the elastic member abuts against the lens group and applies elastic force to the lens group.

[0011] Optionally, the elastic member is a spring, one side of the spring is connected to the central circular hole, and an opening is formed between the other side of the spring and the pressing plate toward the bottom of the lens group.

[0012] Optionally, the elastic sheet and the pressing sheet are integrally formed; a portion of the pressing sheet is folded toward the bottom of the pressing sheet to form the elastic sheet.

[0013] Optionally, the spring piece is provided with a deformation notch.

[0014] Optionally, the pressing plate is connected to a plug-in piece at the bottom facing the lens group, and the position of the plug-in piece corresponds to the glue groove; the lens barrel is provided with a plug-in groove on the first step portion, and the plug-in piece is plugged into the plug-in groove.

[0015] Optionally, a glue-containing gap is provided on a side of the plug-in piece, and part of the light-curing glue is filled in the glue-containing gap.

[0016] Optionally, the plug-in piece and the pressing piece are integrally formed.

[0017] Optionally, a portion of the structure of the pressing sheet at an edge away from the central circular hole is bent to form the plug-in sheet, and the glue-containing groove is formed at a position corresponding to the plug-in sheet.

[0018] Optionally, the elastic member is an elastic rubber ring, and the elastic rubber ring is arranged around and between the central circular hole and the rubber containing groove.

[0019] Optionally, there is a clearance fit between the lens group and the lens barrel; and the elastic force applied by the elastic member to the lens group is greater than the friction force between the lens group and the lens barrel.

[0020] Optionally, the lens group includes a lens body and a spacer, a plurality of the lens bodies are provided, and the plurality of lens bodies are stacked between the first step portion and the second step portion; a spacer is sandwiched between any two adjacent lens bodies.

[0021] According to a second aspect of the present application, an electronic device is provided, comprising the lens assembly as described in the first aspect.

[0022] In the lens assembly provided in the embodiments of the present application, the lens assembly is secured axially by the provision of a pressure plate and an elastic member, maintaining a constant axial compression of the lens assembly. This eliminates positional variation of the lens assembly due to thermal expansion of the lens barrel, thereby reducing thermal defocus. Furthermore, the pressure plate and lens barrel are bonded using a light-curing adhesive, resulting in a secure and reliable connection.

[0023] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0025] Figure 1 FIG2 is a schematic diagram of the overall structure of a lens assembly according to a first embodiment of the present application;

[0026] Figure 2 FIG2 is a schematic cross-sectional view of a lens assembly according to a first embodiment of the present application;

[0027] Figure 3 FIG2 is a schematic diagram showing the connection between the pressing plate and the elastic member in the first embodiment of the lens assembly of the present application;

[0028] Figure 4 FIG2 is a partially enlarged schematic diagram of a first embodiment of a lens assembly of the present application;

[0029] Figure 5 FIG2 is a schematic diagram of the overall structure of a lens assembly according to a second embodiment of the present application;

[0030] Figure 6 FIG2 is a schematic cross-sectional view of a second embodiment of a lens assembly according to the present application;

[0031] Figure 7 FIG2 is a schematic diagram showing the connection between the pressing plate and the elastic member in a second embodiment of a lens assembly of the present application;

[0032] Figure 8 Shown is a partially enlarged schematic diagram of a second embodiment of a lens assembly of the present application.

[0033] Description of reference numerals:

[0034] 1. Lens assembly; 10. Lens barrel; 100. Connector slot; 101. First step; 102. Second step; 11. Lens assembly; 111. Lens body; 112. Spacer; 12. Pressing plate; 120. Center hole; 121. Glue groove; 122. Opening; 13. Elastic member; 130. Deformation notch; 14. Connector; 140. Glue notch;

[0035] 01. Connect the glue column. DETAILED DESCRIPTION

[0036] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0037] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0038] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0039] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0040] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0041] Reference Figures 1-8 As shown, according to one embodiment of the present application, a lens assembly 1 is provided, which includes a lens barrel 10, a lens group 11, a pressing plate 12 and an elastic member 13. The lens barrel 10 has an accommodating cavity, and the lens barrel 10 is provided with a first step portion 101 and a second step portion 102; the lens group 11 is arranged in the accommodating cavity and is located between the first step portion 101 and the second step portion 102; the pressing plate 12 is an annular structure with a central circular hole 120, and the pressing plate 12 is arranged in the On the first step portion 101; a glue groove 121 is provided on the pressing plate 12; the pressing plate 12 and the first step portion 101 are bonded together by light-curing glue, and ultraviolet light pre-cures the light-curing glue through the glue groove 121, and a portion of the light-curing glue forms a connecting glue column 01 at the glue groove 121; the elastic member 13 is connected to the bottom of the pressing plate 12 facing the lens group 11, and the elastic member 13 abuts against the lens group 11 and applies elastic force to the lens group 11.

[0042] In the lens assembly provided in the embodiment of the present application, the lens group 11 is installed in the accommodating cavity of the lens barrel 10 and is located between the first step portion 101 and the second step portion 102. The lens group 11 is pressed together by providing a pressing plate 12 and an elastic member 13. Specifically, the pressing plate 12 is bonded to the first step portion 101 using a photocurable adhesive, and the photocurable adhesive is pre-cured by irradiation with ultraviolet light. Specifically, the ultraviolet light is transmitted through the adhesive groove 121 to pre-cur the photocurable adhesive. Thereafter, the photocurable adhesive is further processed, for example, by baking the photocurable adhesive or subjecting it to moisture treatment, so that the photocurable adhesive is completely cured, thereby improving the tightness and firmness of the connection between the pressing plate 12 and the lens barrel 10. Finally, after the photocurable adhesive is completely cured, a connecting adhesive column 01 is formed at the adhesive groove 121. The use of the photocurable adhesive to bond the pressing plate 12 to the lens barrel 10 provides a stable and reliable connection. The elastic member 13 applies elastic pressure to the lens assembly 11 along the axial direction of the lens barrel 10; the axial direction of the lens barrel 10 is also the axial direction of the lens assembly 11. This ensures that the lens assembly 11 is fixed in the axial direction, keeping the lens assembly 11 in a compressed state along the axial direction, eliminating the positional variation of the lens assembly 11 caused by thermal expansion of the lens barrel 10, and thus reducing the degree of thermal defocus.

[0043] Example 1:

[0044] Reference Figure 3 As shown, in one embodiment, the elastic member 13 is a spring, one side of which is connected to the central circular hole 120 , and an opening 122 is formed between the other side of the spring and the bottom of the pressing plate 12 toward the lens group 11 .

[0045] In this specific example, the elastic member 13 is formed by connecting a spring sheet to the bottom of the pressing plate 12; when the spring sheet abuts and presses the lens group 11, the opening 122 formed between the spring sheet and the pressing plate 12 becomes smaller, thereby achieving elastic deformation of the spring sheet.

[0046] Optionally, the spring piece is integrally formed with the pressing piece 12; a portion of the pressing piece 12 is folded toward the bottom of the pressing piece 12 to form the spring piece. That is, the pressing piece 12 is folded toward the bottom at an edge near the central circular hole 120 to form the spring piece. After the spring piece is folded, the connection between the spring piece and the pressing piece 12 defines the boundary of the central circular hole 120. This makes the manufacturing process of the spring piece simple and easy to operate.

[0047] Reference Figure 3 As shown, in one embodiment, the elastic piece is provided with a deformation notch 130 .

[0048] In this specific example, since the spring fragment itself undergoes elastic deformation while applying elastic pressure to the lens assembly 11, the presence of deformation notches 130 provides space for the elastic deformation of the spring fragment. Optionally, three deformation notches 130 are evenly distributed around the center of the central circular hole 120; this facilitates more uniform elastic deformation of the spring fragment and more uniform elastic force applied by the spring fragment to the lens assembly 11.

[0049] Because the spring plate is formed by folding a portion of the pressing plate 12 toward the bottom, the deformable notch 130 is located at the bottom of the pressing plate 12 and is shielded by the pressing plate 12, preventing light leakage through the deformable notch 130. Furthermore, regardless of how the spring plate deforms, the diameter of the central circular hole 120 defined by the connection between the spring plate and the pressing plate 12 remains unchanged, and this diameter serves as the clear aperture of the lens assembly 11.

[0050] Reference Figure 3 As shown, in one embodiment, the pressing plate 12 is connected to a plug-in plate 14 at the bottom toward the lens group 11, and the position of the plug-in plate 14 corresponds to the glue groove 121; the lens barrel 10 is provided with a plug-in groove 100 on the first step portion 101, and the plug-in plate 14 is plugged into the plug-in groove 100.

[0051] In this specific example, the inserting piece 14 provided on the pressing piece 12 is plugged into the inserting groove 100 provided on the first step portion 101 , so that the pressing piece 12 can be connected to the lens barrel 10 more firmly and securely.

[0052] Reference Figure 3 As shown, in one embodiment, a glue receiving gap 140 is opened on the side of the plug-in piece 14 , and part of the light-curing glue is filled in the glue receiving gap 140 .

[0053] Because light-curing adhesive is applied between the pressing piece 12 and the first step portion 101, the light-curing adhesive will enter the plug-in slot 100. In this specific example, the adhesive-receiving notch 140 formed on the side of the plug-in piece 14 can accommodate a portion of the light-curing adhesive. After the light-curing adhesive solidifies, it is engaged with the plug-in piece 14 at the adhesive-receiving notch 140, thereby further ensuring the stability of the connection between the pressing piece 12 and the lens barrel 10. Optionally, a glue-receiving notch 140 is formed on both sides of each plug-in piece 14.

[0054] Reference Figure 3 As shown, in one embodiment, the plug-in piece 14 is integrally formed with the pressing piece 12. Optionally, a portion of the structure of the pressing piece 12 at the edge away from the central circular hole 120 is bent to form the plug-in piece 14, and the adhesive groove 121 is formed at a position corresponding to the plug-in piece 14.

[0055] In this specific example, two cuts are made on the edge of the pressing plate 12 away from the central circular hole 120. The portion between the two cuts is bent toward the bottom of the pressing plate 12 to form an inserting piece 14. This makes the manufacturing process of inserting piece 14 simple and easy. Alternatively, three inserting pieces 14 can be evenly distributed around the center of the central circular hole 120. This will further stabilize the connection of the pressing plate 12 to the lens barrel 10 and facilitate the elastic member 13 to apply a more uniform elastic force to the lens assembly 11.

[0056] Example 2:

[0057] Reference Figure 7 As shown, in one embodiment, the elastic member 13 is an elastic rubber ring, and the elastic rubber ring is disposed around and between the central circular hole 120 and the rubber containing groove 121 .

[0058] In this specific example, a circle of elastic rubber ring is provided at the bottom of the pressing plate 12 as the elastic member 13, which is conducive to simplifying the structure and manufacturing process of the entire lens assembly. Optionally, the elastic rubber ring is a silicone ring or a rubber ring.

[0059] In one embodiment, the lens group 11 and the lens barrel 10 are clearance-fitted; the elastic force applied by the elastic member 13 to the lens group 11 is greater than the friction force between the lens group 11 and the lens barrel 10 .

[0060] In this specific example, a reasonable gap is set between lens assembly 11 and lens barrel 10, depending on the decentration requirements of the optical design. At the same time, the elastic force applied by elastic member 13 to lens assembly 11 is greater than the friction between lens assembly 11 and lens barrel 10. This further ensures that when lens barrel 10 is heated and expands, the elastic pressure of elastic member 13 will not cause lens assembly 11 to be pulled and displaced by lens barrel 10. This is because the elastic pressure of elastic member 13 will overcome the friction between lens assembly 11 and lens barrel 10, thereby fixing lens assembly 11 in its original position.

[0061] Reference Figure 2 、 Figure 6 As shown, in one embodiment, the lens group 11 includes a lens body 111 and a spacer 112, and a plurality of the lens bodies 111 are provided, and the plurality of 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.

[0062] In this specific example, the spacer 112 cooperates with the curved surface of the lens body 111 to provide auxiliary centering, further ensuring that the lens assembly 11 is always in a compressed state, thereby helping to eliminate the positional variation of the lens body 111 caused by thermal expansion of the lens barrel 10, thereby reducing the degree of thermal defocus. Optionally, the spacer 112 is made of metal.

[0063] Optionally, the lens barrel 10 may be in a rectangular parallelepiped shape or a cylindrical shape.

[0064] According to another embodiment of the present application, an electronic device is provided, which includes the lens assembly 1 described above. The electronic device may be, for example, a DLP (Digital Light Processor).

[0065] Although some specific embodiments of the present application have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present application. It should be understood by those skilled in the art that the above embodiments may 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 comprises: A lens barrel (10), wherein the lens barrel (10) has a receiving cavity therein, and the lens barrel (10) is provided with a first step portion (101) and a second step portion (102); a lens assembly (11), the lens assembly (11) being arranged in the accommodating cavity and located between the first step portion (101) and the second step portion (102); A pressing sheet (12), the pressing sheet (12) being an annular structure having a central circular hole (120), the pressing sheet (12) being arranged on the first step portion (101); a glue receiving groove (121) being provided on the pressing sheet (12); the pressing sheet (12) and the first step portion (101) being bonded together by light-curing glue, ultraviolet light pre-curing the light-curing glue via the glue receiving groove (121), and a portion of the light-curing glue forming a connecting glue column (01) at the glue receiving groove (121); an elastic member (13), the elastic member (13) being connected to the bottom of the pressing plate (12) facing the lens group (11), the elastic member (13) being in contact with the lens group (11) and applying elastic force to the lens group (11); The pressing plate (12) is connected to a plug-in plate (14) at the bottom facing the lens group (11), and the position of the plug-in plate (14) corresponds to the glue-containing groove (121); the lens barrel (10) is provided with a plug-in groove (100) at the first step portion (101), and the plug-in plate (14) is plugged into the plug-in groove (100); a portion of the structure at the edge of the pressing plate (12) away from the central circular hole (120) is bent to form the plug-in plate (14), and the glue-containing groove (121) is formed at a position corresponding to the plug-in plate (14).

2. The lens assembly according to claim 1, wherein: The elastic member (13) is a spring sheet, one side of which is connected to the central circular hole (120), and an opening (122) is formed between the other side of the spring sheet and the bottom of the pressing plate (12) facing the lens group (11).

3. The lens assembly according to claim 2, wherein: The spring sheet and the pressing sheet (12) are integrally formed; a portion of the pressing sheet (12) is folded toward the bottom of the pressing sheet (12) to form the spring sheet.

4. The lens assembly according to claim 2 or 3, wherein: The spring piece is provided with a deformation notch (130).

5. The lens assembly according to claim 1, wherein: A glue-containing notch (140) is provided on the side of the plug-in piece (14), and part of the light-curing glue is filled in the glue-containing notch (140).

6. The lens assembly according to claim 1, wherein: The plug-in piece (14) and the pressing piece (12) are integrally formed.

7. The lens assembly according to claim 1, wherein: The elastic member (13) is an elastic rubber ring, and the elastic rubber ring is arranged around and between the central circular hole (120) and the rubber containing groove (121).

8. The lens assembly according to claim 1, wherein: There is a clearance fit between the lens group (11) and the lens barrel (10); and the elastic force applied by the elastic member (13) to the lens group (11) is greater than the friction force between the lens group (11) and the lens barrel (10).

9. The lens assembly according to claim 1, wherein: The lens group (11) comprises a lens body (111) and a spacer (112), wherein a plurality of lens bodies (111) are provided, and the plurality of lens bodies (111) are stacked and arranged between the first step portion (101) and the second step portion (102); and a spacer (112) is sandwiched between any two adjacent lens bodies (111).

10. An electronic device, characterized in that: The electronic device comprises a lens assembly (1) according to any one of claims 1 to 9.

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