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, a pressing plate and an elastic rubber ring. The lens barrel has a containing cavity. The lens barrel is provided with a first step portion. The lens group is arranged in the containing cavity. The pressing plate is an annular structure with a central circular hole. The pressing plate is arranged on the first step portion. A positioning through hole is arranged on the pressing plate. The lens barrel is provided with a connecting column protruding from the first step portion. The connecting column is embedded in the positioning through hole, and the connecting column and the pressing plate are connected by ultrasonic welding. The elastic rubber ring is connected to one side of the pressing plate facing the lens group. The elastic rubber ring is arranged around the central circular hole and the positioning through hole. The elastic rubber ring abuts against the lens group and applies elastic force to the lens group.

Description

Technical Field

[0001] This application relates to the field of electronic product technology, and more specifically, to a lens assembly and electronic device. Background Technology

[0002] In recent years, with the rapid development of science and technology, projection technology has become increasingly mature, and the application fields of projection equipment have become increasingly wide. These include commercial fields such as conference presentations, roadshows, and promotional activities; educational fields such as school lectures and academic discussions; and home fields such as home theaters. The internal components of a projection device include lenses for adjusting the beam and a lens barrel for mounting the lenses.

[0003] When a projection device operates for an extended period of time, the light exposure causes the lens barrel to heat up and undergo slight deformation, resulting in lens displacement. This deformation of the lens barrel and the displacement of the lens can cause the light path to lose its optimal focusing and imaging effect. This phenomenon is called thermal defocusing or thermal defocusing.

[0004] In view of this, a new technical solution is needed to at least alleviate the thermal defocusing problem of projection devices. Summary of the Invention

[0005] One objective of this application is to provide a new technical solution for a lens assembly and electronic device.

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

[0007] The microscope tube has a receiving cavity inside, and the microscope tube is provided with a first step portion;

[0008] A lens assembly, wherein the lens assembly is disposed within the receiving cavity;

[0009] A pressure plate, wherein the pressure plate is an annular structure with a central circular hole, and the pressure plate is disposed on the first stepped portion; a positioning through hole is provided on the pressure plate;

[0010] The lens barrel has a connecting post protruding from the first step portion. The connecting post is embedded in the positioning through hole, and the connecting post is connected to the pressure plate by ultrasonic welding.

[0011] An elastic rubber ring is connected to the side of the pressure plate facing the lens assembly, and the elastic rubber ring is arranged around the central circular hole and the positioning through hole; the elastic rubber ring abuts against the lens assembly and applies elastic force to the lens assembly.

[0012] Optionally, the receiving cavity includes a first cavity and a second cavity arranged along the axial direction of the lens barrel, the first cavity being disposed near the first step portion, and the inner diameter of the second cavity being larger than the inner diameter of the first cavity;

[0013] The lens assembly includes a first lens, a second lens, a first spacer and a second spacer. Multiple first lenses are provided, and multiple first lenses are stacked in the first cavity. A first spacer is sandwiched between any two adjacent first cavities.

[0014] The second lens is disposed in the second cavity, and the diameter of the second lens is larger than that of the first lens; a second spacer is sandwiched between the second lens and the first lens disposed adjacent to it.

[0015] Optionally, a second step is formed between the first cavity and the second cavity, and the second lens rests on the second step.

[0016] Optionally, the second lens is bonded to the lens barrel with an adhesive.

[0017] Optionally, the second spacer has a first insertion part on its side and the inner wall of the lens barrel has a second insertion part, wherein the first insertion part and the second insertion part are matched and inserted.

[0018] Optionally, the second spacer ring and the lens barrel are integrally injection molded.

[0019] Optionally, the first insertion part is an insertion groove, and the second insertion part is an insertion boss.

[0020] Optionally, the lens assembly and the lens barrel are fitted with a clearance; the elastic force applied by the elastic ring to the lens assembly is greater than the frictional force between the lens assembly and the lens barrel.

[0021] Optionally, the positioning through hole is circular, and at least six positioning through holes are provided, with the at least six positioning through holes distributed on the same circumference; the connecting post is provided in a one-to-one correspondence with the positioning through hole.

[0022] Optionally, the circumferences of at least six of the positioning through holes are concentric with the central hole.

[0023] According to a second aspect of this application, an electronic device is provided, the electronic device comprising a lens assembly as described in the first aspect.

[0024] In the lens assembly provided in this application embodiment, the lens group is fixed along the axial direction by the setting of the pressure plate and the elastic rubber ring, so that the lens group is always in a compressed state along the axial direction, eliminating the positional variation of the lens group caused by the thermal expansion of the lens barrel, thereby reducing the degree of thermal defocusing. Furthermore, the pressure plate is connected to the connecting post of the lens barrel through its positioning through hole by ultrasonic welding. The ultrasonic welding connection method is convenient to operate, has a firm connection, and the temperature of ultrasonic welding is not too high, so it will not damage the elastic rubber ring.

[0025] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0026] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0027] Figure 1 The diagram shown is an overall structural schematic of a lens assembly according to this application;

[0028] Figure 2 The diagram shown is a cross-sectional view of a lens assembly according to this application.

[0029] Figure 3 The diagram shown is a partial exploded cross-sectional view of a lens assembly according to this application.

[0030] Figure 4 The diagram shown is a schematic diagram of the connection between the pressure plate and the elastic rubber ring in a lens assembly according to this application;

[0031] Figure 5 The image shown is a partially enlarged schematic diagram of a lens assembly according to this application.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Lens assembly; 10. Lens barrel; 100. Connecting post; 101. First step; 102. Second step; 103. Second insertion part; 11. Lens group; 111. First lens element; 112. Second lens element; 113. First spacer; 114. Second spacer; 1140. First insertion part; 12. Pressing plate; 120. Central circular hole; 121. Positioning through hole; 13. Elastic rubber ring. Detailed Implementation

[0034] 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 arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0035] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0036] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0037] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0038] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0039] Reference Figures 1-5 As shown, according to one embodiment of this application, a lens assembly 1 is provided. The lens assembly 1 includes a lens barrel 10, a lens group 11, a pressure plate 12, and an elastic rubber ring 13. The lens barrel 10 has a receiving cavity and a first step portion 101. The lens group 11 is disposed in the receiving cavity. The pressure plate 12 is an annular structure with a central circular hole 120 and is disposed on the first step portion 101. A positioning through hole 121 is formed on the pressure plate 12.

[0040] The lens barrel 10 has a connecting post 100 protruding from the first stepped portion 101. The connecting post 100 is embedded in the positioning through hole 121, and the connecting post 100 is connected to the pressure plate 12 by ultrasonic welding. The elastic rubber ring 13 is connected to the side of the pressure plate 12 facing the lens group 11, and the elastic rubber ring 13 is arranged around the center circular hole 120 and the positioning through hole 121. The elastic rubber ring 13 abuts against the lens group 11 and applies elastic force to the lens group 11.

[0041] In the lens assembly provided in this application embodiment, the lens group 11 is installed in the receiving cavity of the lens barrel 10, and the lens group 11 is pressed together by a pressure plate 12 provided on the first step portion 101 and an elastic rubber ring 13 connected to the pressure plate 12. Specifically, the pressure plate 12 is connected to the connecting post 100 protruding from the first step portion 101 through its positioning through hole 121 by ultrasonic welding. The ultrasonic welding connection method is convenient to operate, has a firm connection, and the temperature of ultrasonic welding is not too high, so it will not damage the elastic rubber ring 13. The elastic rubber ring 13 applies elastic pressure to the lens group 11 in the axial direction of the lens barrel 10, which is also the axial direction of the lens group 11; thereby fixing the lens group 11 in the axial direction, so that the lens group 11 is always in a compressed state in the axial direction, eliminating the positional variation of the lens group 11 caused by the thermal expansion of the lens barrel 10, thereby reducing the degree of thermal defocusing.

[0042] Optionally, the compression plate 12 is made of metal, and the elastic ring 13 is made of silicone or rubber.

[0043] Reference Figure 2 As shown, in one embodiment, the receiving cavity includes a first cavity and a second cavity arranged along the axial direction of the lens barrel 10. The first cavity is disposed near the first step portion 101, and the inner diameter of the second cavity is larger than the inner diameter of the first cavity.

[0044] The lens group 11 includes a first lens 111, a second lens 112, a first spacer 113 and a second spacer 114. Multiple first lenses 111 are provided, and multiple first lenses 111 are stacked in the first cavity. A first spacer 113 is sandwiched between any two adjacent first cavities.

[0045] The second lens 112 is disposed in the second cavity, and the diameter of the second lens 112 is larger than the diameter of the first lens 111; a second spacer 114 is sandwiched between the second lens 112 and the first lens 111 disposed adjacent to it.

[0046] In this specific example, the receiving cavity within the lens barrel 10 includes two chambers, one with a smaller inner diameter and the other with a larger inner diameter. A first lens 111 with a smaller aperture is housed in the first chamber, and a second lens 112 with a larger aperture is housed in the second chamber. Furthermore, a first spacer 113 is sandwiched between adjacent first lenses 111, and a second spacer 114 is sandwiched between adjacent first lenses 111 and second lenses 112. This embodiment achieves a reasonable arrangement of lenses with different apertures. The curved surface of the first spacer 113 and the first lens 111 provides auxiliary centering, as does the curved surface of the second spacer 114 and the second lens 112, further ensuring that the lens assembly 11 is always in a compressed state. This helps eliminate positional variations in the lens assembly 11 caused by thermal expansion of the lens barrel 10, thereby reducing the degree of thermal defocusing. Optionally, both the first spacer 113 and the second spacer 114 are made of metal.

[0047] Reference Figure 2 As shown, in one embodiment, a second step portion 102 is formed between the first cavity and the second cavity, and the second lens 112 rests on the second step portion 102. Furthermore, the second lens 112 is bonded to the lens barrel 10 by an adhesive.

[0048] In this specific example, the surface of the second lens 112 facing the first lens 111 rests against the second step portion 102, and the second lens 112 is bonded to the lens barrel 10 by an adhesive. This makes the fixation of the second lens 112 more secure, thereby improving the stability of the entire lens assembly 11 and further helping to reduce the degree of thermal defocusing. Optionally, the adhesive is lens glue.

[0049] Reference Figure 3 As shown, in one embodiment, the side of the second spacer 114 is provided with a first insertion part 1140, and the inner sidewall of the lens barrel 10 is provided with a second insertion part 103, wherein the first insertion part 1140 and the second insertion part 103 are matched and inserted.

[0050] In this specific example, the second spacer 114 is matched and inserted into the inner wall of the lens barrel 10 through the first insertion part 1140 and the second insertion part 103, so that the second spacer 114 can be very firmly fixed in the receiving cavity of the lens barrel 10, thereby helping to reduce the degree of thermal defocusing.

[0051] In one embodiment, the second spacer 114 and the lens barrel 10 are integrally injection molded.

[0052] In this specific example, the plastic lens barrel 10 and the metal second spacer 114 are integrally formed by injection molding. This makes the process of setting the second spacer 114 simpler and easier to operate, and the connection between the second spacer 114 and the lens barrel 10 is more reliable.

[0053] Reference Figure 3 As shown, in one embodiment, the first insertion portion 1140 is an insertion groove, and the second insertion portion 103 is an insertion boss.

[0054] In this specific example, the second insertion portion 103 on the lens barrel 10 is inserted into the first insertion portion 1140 on the second spacer 114; of course, the first insertion portion 1140 on the second spacer 114 can also be set as an insertion boss, while the second insertion portion 103 on the lens barrel 10 can be set as an insertion groove.

[0055] In one embodiment, the lens assembly 11 and the lens barrel 10 are in a clearance fit; the elastic force applied by the elastic ring 13 to the lens assembly 11 is greater than the frictional force between the lens assembly 11 and the lens barrel 10.

[0056] In this specific example, a reasonable gap is provided between the lens group 11 and the lens barrel 10, which depends on the optical design's requirement for eccentricity. Simultaneously, the elastic force applied to the lens group 11 by the elastic ring 13 is greater than the frictional force between the lens group 11 and the lens barrel 10. This further ensures that when the lens barrel 10 undergoes thermal expansion due to heat, the lens group 11 will not be pulled and displaced by the lens barrel 10 under the elastic pressure of the elastic ring 13, because the elastic pressure of the elastic ring 13 will overcome the frictional force between the lens group 11 and the lens barrel 10, thus fixing the lens group 11 in its original position.

[0057] Reference Figure 4 As shown, in one embodiment, the positioning through hole 121 is circular, and at least six positioning through holes 121 are provided, and the at least six positioning through holes 121 are distributed on the same circumference; the connecting post 100 is provided in a one-to-one correspondence with the positioning through hole 121.

[0058] In this specific example, at least six positioning through holes 121 are provided on the press plate to connect with the matching connecting post 100, so that the press plate 12 is installed on the lens barrel 10 very firmly and securely.

[0059] Optionally, twelve positioning through holes 121 and twelve connecting posts 100 are provided, and the circumference of these twelve positioning through holes 121 is concentric with the central circular hole 120. In this way, the elastic ring 13 connected to the pressure plate 12 applies a more uniform elastic force to the lens assembly 11.

[0060] Alternatively, the lens tube 10 can be rectangular or cylindrical.

[0061] According to another embodiment of this application, an electronic device is provided, which includes the lens assembly 1 as described above. The electronic device may, for example, be a DLP (Digital Light Processor).

[0062] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A lens assembly, characterized in that, The lens assembly, used in projection devices, includes: The lens tube (10) has a receiving cavity inside, and the lens tube (10) is provided with a first step (101). Lens assembly (11), wherein the lens assembly (11) is disposed within the receiving cavity; the receiving cavity includes a first cavity and a second cavity arranged along the axial direction of the lens barrel (10), wherein the first cavity is disposed near the first step portion (101), and the inner diameter of the second cavity is larger than the inner diameter of the first cavity; A pressure plate (12) is an annular structure with a central circular hole (120). The pressure plate (12) is disposed on the first step portion (101). A positioning through hole (121) is provided on the pressure plate (12). The lens barrel (10) has a connecting post (100) protruding from the first step (101). The connecting post (100) is embedded in the positioning through hole (121), and the pressure plate (12) is connected to the connecting post (100) protruding from the first step (101) through the positioning through hole (121) by ultrasonic welding. An elastic rubber ring (13) is connected to the side of the pressure plate (12) facing the lens group (11), and the elastic rubber ring (13) is arranged around the central circular hole (120) and the positioning through hole (121); the elastic rubber ring (13) abuts against the lens group (11) and applies elastic force to the lens group (11); the lens group (11) and the lens barrel (10) are in clearance fit; the elastic force applied by the elastic rubber ring (13) to the lens group (11) is greater than the frictional force between the lens group (11) and the lens barrel (10); a second step portion (102) is formed between the first cavity and the second cavity; the lens group (11) includes a first lens (111) and a second lens (112); the second lens (112) is disposed in the second cavity and rests on the second step portion (102).

2. The lens assembly according to claim 1, characterized in that, The lens group (11) further includes a first spacer (113) and a second spacer (114). Multiple first lenses (111) are provided, and multiple first lenses (111) are stacked in the first cavity. A first spacer (113) is sandwiched between any two adjacent first lenses (111). The diameter of the second lens (112) is larger than that of the first lens (111); a second spacer (114) is sandwiched between the second lens (112) and the first lens (111) disposed adjacent to it.

3. The lens assembly according to claim 2, characterized in that, The second lens (112) is bonded to the lens barrel (10) by an adhesive.

4. The lens assembly according to claim 2, characterized in that, The second spacer (114) has a first insertion part (1140) on its side, and the inner wall of the lens barrel (10) has a second insertion part (103). The first insertion part (1140) and the second insertion part (103) are matched and inserted.

5. The lens assembly according to claim 4, characterized in that, The second spacer (114) and the lens barrel (10) are integrally injection molded.

6. The lens assembly according to claim 4 or 5, characterized in that, The first plug-in part (1140) is a plug-in groove, and the second plug-in part (103) is a plug-in boss.

7. The lens assembly according to claim 1, characterized in that, The positioning through hole (121) is circular, and at least six positioning through holes (121) are provided, and the at least six positioning through holes (121) are distributed on the same circumference; the connecting post (100) is provided in a one-to-one correspondence with the positioning through hole (121).

8. The lens assembly according to claim 7, characterized in that, The circumferences of at least six of the positioning through holes (121) are concentric with the central circular hole (120).

9. An electronic device, characterized in that, The electronic device includes a lens assembly (1) as claimed in any one of claims 1-8.

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