Lens module

Abstract

A lens module defines a central axis, an object side, and an image side located opposite the object side, and includes: a lens barrel including an inner annular surface surrounding the central axis and an outer annular surface opposite and surrounding the inner annular surface, wherein the inner annular surface forms an accommodating space; and an optical lens group and a filter, sequentially disposed from the object side to the image side within the accommodating space; wherein the lens barrel further includes an annular structure disposed on the inner annular surface and surrounding the central axis, the annular structure including at least two stepped portions and at least two inclined portions, each of the stepped portions and each of the inclined portions being close to the image side, and the filter being disposed on each of the stepped portions; and; each of the stepped portions and each of the inclined portions are alternately disposed along an annular path along the inner annular surface.

Description

Technical Field

[0001] The present invention relates to a lens module, and more particularly to a lens module that requires only a single application of adhesive. Background Technology

[0002] A digital camera lens module typically includes a lens barrel, an optical lens group, and a filter. During assembly, the optical lens group and the filter are sequentially installed into the lens barrel, and the filter is fixed by applying adhesive, thereby achieving the purpose of fixing the optical lens group.

[0003] However, during the dispensing and filter assembly process, a first UV adhesive (i.e., ultraviolet curing adhesive) is first applied to the outer periphery of the last optical lens of the optical lens group, and then a second UV adhesive is applied to the outer periphery of the step where the filter is placed. Finally, the filter is placed on top and cured by ultraviolet (UV) light. This two-stage dispensing process results in poor assembly efficiency for the lens module.

[0004] Therefore, there is a need to provide a lens module that can solve the aforementioned problems. Summary of the Invention

[0005] One object of the present invention is to provide a lens module that requires only one application of adhesive.

[0006] In accordance with the above objectives, the present invention provides a lens module that defines a central axis, an object side, and an image side located opposite the object side, and includes: a lens barrel including an inner annular surface surrounding the central axis and an outer annular surface opposite to and surrounding the inner annular surface, wherein the inner annular surface forms an accommodating space; and an optical lens group and a filter, which are sequentially disposed in the accommodating space from the object side to the image side; wherein the lens barrel further includes an annular structure disposed on the inner annular surface and surrounding the central axis, the annular structure including at least two stepped portions and at least two inclined portions, each of the stepped portions and each of the inclined portions being close to the image side, and the filter being disposed on each of the stepped portions; and; each of the stepped portions and each of the inclined portions are alternately disposed along an annular path of the inner annular surface.

[0007] As an embodiment of the present invention, the lens module further includes an adhesive disposed between the filter and the lens barrel, and disposed on each of the inclined surfaces.

[0008] As an embodiment of the present invention, the optical lens assembly includes an optical lens, and the adhesive is disposed between the optical lens and the lens barrel.

[0009] As an objective embodiment of the present invention, each of the stepped portions includes a groove, each groove is adjacent to the inner annular surface, and the adhesive is disposed in each groove.

[0010] As an embodiment of the present invention, the annular structure further includes at least two platforms, each platform being disposed between each inclined surface and the inner annular surface, and the adhesive being disposed on each platform.

[0011] As an embodiment of the present invention, the optical lens assembly includes an optical lens, and the adhesive is spaced between the optical lens and the lens barrel.

[0012] As an objective embodiment of the present invention, each of the said platform surfaces and a bottom of each of the said grooves are coplanar.

[0013] As an objective embodiment of the present invention, each of the inclined surfaces is connected to the corresponding table surface.

[0014] As an objective embodiment of the present invention, each of the inclined surfaces is connected to the inner annular surface.

[0015] As an objective embodiment of the present invention, each of the stepped portions has a partial circumference of C2 along the annular path of the inner ring surface, and the annular structure has a complete circumference of C1 along the annular path of the inner ring surface, satisfying the following condition: 0.25 <C2 / C1<0.75。

[0016] As an objective embodiment of the present invention, each of the inclined surfaces has an included angle Ɵ1 with the central axis, and satisfies the following condition: 5 o <Ɵ1<85 o .

[0017] Due to the design of each of the beveled surfaces and grooves, only one application of the adhesive is required. The adhesive (e.g., UV glue, i.e., ultraviolet curing glue) can flow downwards from each of the beveled surfaces and grooves to the annular groove between the last optical lens of the optical lens assembly and the lens barrel. Finally, it is cured by ultraviolet (UV) irradiation, which can simultaneously fix the filter and the last optical lens of the optical lens assembly (i.e., the optical lens closest to the image side), thereby improving the dispensing efficiency and making the assembly efficiency of the lens module better. Attached Figure Description

[0018] Figure 1 This is a plan view of the lens module according to the first embodiment of the present invention.

[0019] Figure 2 The lens module of the present invention is along Figure 1 A schematic diagram of the cross section A1-A1.

[0020] Figure 3 The lens module of the present invention is along Figure 1 A schematic diagram of the cross section along line A2-A2.

[0021] Figure 4 The lens module of the present invention is along Figure 1 A schematic diagram of the cross section A3-A3.

[0022] Figure 5 It shows that at least two stepped sections have a local circumference of C2, and the ring structure has a complete circumference of C1.

[0023] Figure 6 This is a cross-sectional schematic diagram of the dispensing and assembling filter method according to the first embodiment of the present invention.

[0024] Figure 7 This is a plan view of the lens module according to the second embodiment of the present invention.

[0025] Figure 8 The lens module of the present invention is along Figure 7 A cross-sectional diagram of section BB.

[0026] Figure 9 This is a plan view of the lens module according to the second embodiment of the present invention.

[0027] Figure 10 The lens module of the present invention is respectively along Figure 9 A cross-sectional diagram of section CC.

[0028] In the picture:

[0029] 1 Lens module; 10 Central axis; 11 Lens barrel; 110 Annular structure; 111 Stepped section; 1111 Groove; 112 Beveled section; 1121 Beveled surface; 113 Inner annular surface; 114 Outer annular surface; 115 Accommodating space; 116 Platform; 12 Optical lens group; 121 Optical lens; 1212 Non-optical area; 1213 Annular groove; 13 Filter; 14 Adhesive; 141 Arrow; CIR annular path; C1 Complete circumference; C2 Local circumference; IS Image side; OS Object side; Ɵ1 Angle. Detailed Implementation

[0030] To make the above-mentioned objectives, features and characteristics of the present invention readily apparent, the relevant embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0031] Figure 1 This is a plan view of a lens module according to a first embodiment of the present invention, wherein the filter is shown in outline with dashed lines. Figure 2 , Figure 3 and Figure 4 The lens module of the present invention is respectively along Figure 1 Please refer to the cross-sectional diagrams along lines A1-A1, A2-A2, and A3-A3. Figures 1-4The lens module 1 defines a central axis 10, an object-side OS, and an image-side IS located opposite the object-side OS. The lens module 1 includes a lens barrel 11, a filter 13, an optical lens group 12, and an adhesive 14. The lens barrel 11 includes an inner annular surface 113 surrounding the central axis 10 and an outer annular surface 114 opposite to and surrounding the inner annular surface 113, wherein the inner annular surface 113 forms a receiving space 115. The lens barrel 11 may be made of plastic material.

[0032] Please refer to this again. Figure 1 and Figure 2 The lens barrel 11 further includes an annular structure 110, which is disposed on the inner annular surface 113 and surrounds the central axis 10. The annular structure 110 includes at least two stepped portions 111 and at least two beveled portions 112, each of which is close to the image side IS. In this embodiment, the annular structure 110 includes at least two stepped portions 111 and at least two beveled portions 112. Each stepped portion 111 and each beveled portion 112 is alternately arranged along an annular path CIR of the inner annular surface 113. In this embodiment, the annular structure 110 includes four stepped portions 111 and four inclined portions 112. The stepped portions 111, the inclined portions 112, the stepped portions 111, the inclined portions 112, the stepped portions 111, the inclined portions 112, the stepped portions 111, and the inclined portions 112 are arranged alternately along the annular path CIR of the inner annular surface 113.

[0033] Please refer to this again. Figure 2 The optical lens group 12 and the filter 13 are sequentially disposed within the receiving space 115 of the lens barrel 11 from the object side OS to the image side IS, and the filter 13 is disposed on each of the stepped portions 111 of the lens barrel 11. In this embodiment, the optical lens group 12 includes an optical lens 121, which is the lens of the optical lens group 12 closest to the image side IS, and may be made of plastic or glass. Other optical elements may also be disposed within the lens barrel 11, such as spacer rings or light-blocking elements (e.g., aperture diaphragms or diaphragms for correcting edge rays).

[0034] Please refer to this again. Figure 2 and Figure 1, the adhesive 14 (i.e., glue, such as UV glue, i.e., ultraviolet curable glue, but not limited thereto) is disposed between the filter 13 and the lens barrel 11. The adhesive 14 is disposed on each of the inclined surfaces 112 of the lens barrel 11, and the adhesive 14 is disposed between the optical lens 121 and the lens barrel 11 (for example, an annular groove 1213 is formed between the non-optical region 1212 of the optical lens 121 and the lens barrel 11, and the adhesive 14 flows into the annular groove 1213), so as to fix the filter 13 and the optical lens 121 of the optical lens group 12 simultaneously.

[0035] Please refer to again Figure 2 , each of the stepped portions 111 includes a groove 1111. Each of the grooves 1111 is adjacent to the inner annular surface 113, and the adhesive 14 is disposed in each of the grooves 1111, so as to increase the adhesion area of the adhesive 14 to the filter 13, and further increase the adhesive force between the filter 13 and the lens barrel 11. Furthermore, each of the inclined surfaces 112 is connected to the inner annular surface 113. An included angle Ɵ1 is formed between an inclined surface 1121 of each of the inclined surfaces 112 and the central axis 10, and the following condition is satisfied: 5 o < Ɵ1 < 85 o , so that the adhesive 14 flows to the annular groove 1213 between the non-optical region 1222 of the optical lens 121 and the lens barrel 11 at an appropriate flow rate. Preferably, the included angle Ɵ1 further satisfies the following condition: 15 o < Ɵ1 < 75 o . In this embodiment, the normal direction of the inclined surface 1121 of the inclined surface 112 faces the image side IS.

[0036] Please refer to Figure 5 and Figure 1 , each of the stepped portions 112 has a partial circular circumference C2 along the annular path CIR of the inner annular surface 113, and the annular structure 110 has a complete circular circumference C1 along the annular path CIR of the inner annular surface 113, and the following condition is satisfied: 0.25 < C2 / C1 < 0.75, so that each of the stepped portions 112 forms a sufficient support length, so that the filter 13 can be stably supported on each of the stepped portions 112.

[0037] Figure 6This is a cross-sectional schematic diagram of the dispensing and assembling method for a filter according to a first embodiment of the present invention. The annular structure 110 of the lens barrel 11 of the present invention includes at least two stepped portions 111 and at least two inclined portions 112, each of the stepped portions 111 including a groove 1111 (i.e., a dispensing groove). First, the adhesive 14 is dispensed in a ring shape on the inner annular surface 113 of the lens barrel (as shown by arrow 141), and then the filter 13 is disposed on each of the stepped portions 111, thereby completing the assembly of the filter 13. Due to the design of each of the beveled surfaces 112 and each of the grooves 1111, only one application of the adhesive 14 is required. The adhesive 14 (e.g., UV glue, i.e., ultraviolet curing glue, but not limited thereto) can flow downward from each of the beveled surfaces 112 and each of the grooves 1111 to the annular groove 1213 between the last optical lens 121 of the optical lens group 12 and the lens barrel 11. Finally, it is cured by ultraviolet (UV) irradiation, which can simultaneously fix the filter 13 and the last optical lens 121 of the optical lens group 12 (i.e., the optical lens closest to the image side), thereby improving the dispensing efficiency and making the assembly efficiency of the lens module better.

[0038] Figure 7 This is a plan view of a lens module according to a second embodiment of the present invention, wherein the filter is shown in outline with dashed lines. Figure 8 The lens module of the present invention is respectively along Figure 7 A cross-sectional view of BB is shown. The lens module of the second embodiment is generally similar to the lens module of the first embodiment, with similar components labeled with similar reference numerals. The difference between the second and first embodiment lens module 1 is that in the second embodiment, the annular structure 110 further includes at least two platforms 116, each of which is disposed between each of the inclined surfaces 112 and the inner annular surface 113. Each inclined surface 112 is connected to the corresponding platform 116, that is, each inclined surface 112 is connected to the inner annular surface 113 via each platform 116. The design of each platform 116 allows a portion of the adhesive 14 to remain on each platform 116, and a portion of the adhesive 14 then flows downward along each inclined surface 112 via each platform 116. The adhesive 14 remaining on each of the aforementioned platforms 116 can increase the adhesion area of ​​the adhesive 14 to the filter 13, thereby increasing the adhesion between the filter 13 and the lens barrel 11. In this embodiment, the bottom of each of the aforementioned platforms 116 and the bottom of each of the aforementioned grooves 1111 are coplanar.

[0039] Please refer to this again. Figure 8 and Figure 7The adhesive 14 (i.e., glue, such as UV glue, i.e., ultraviolet curing glue, but not limited thereto) is disposed between the filter 13 and the lens barrel 11. The adhesive 14 is disposed on each of the said platform 116. The adhesive 14 is disposed on each of the said inclined surface 112. The adhesive 14 is disposed between the optical lens 121 and the lens barrel 11 (for example, an annular groove 1213 is formed between the non-optical area 1212 of the optical lens 121 and the lens barrel 11, and the adhesive 14 flows into all of the annular groove 1213) to simultaneously fix the filter 13 and the optical lens 121 of the optical lens group 12.

[0040] Due to the design of each of the platform 116, each of the inclined surfaces 112, and each of the grooves 1111, the adhesive 14 (e.g., UV glue, i.e., ultraviolet curing glue, but not limited thereto) can flow downward from each of the platform 116, each of the inclined surfaces 112, and each of the grooves 1111 to the annular groove 1213 between the last optical lens 121 of the optical lens group 12 and the lens barrel 11, and finally be cured by ultraviolet (UV) irradiation. This can simultaneously fix the filter 13 and the last optical lens 121 of the optical lens group 12 (i.e., the optical lens closest to the image side), thereby improving the dispensing efficiency and thus making the assembly efficiency of the lens module better.

[0041] Figure 9 This is a plan view of a lens module according to a second embodiment of the present invention, wherein the filter is shown in outline with dashed lines. Figure 10 The lens module of the present invention is respectively along Figure 9 A cross-sectional view of the cross section CC. The lens module of the third embodiment is generally similar to the lens module of the second embodiment, with similar components labeled with similar reference numerals. The difference between the lens module 1 in the third and second embodiments is that the adhesive 14 (i.e., glue, such as UV glue, i.e., ultraviolet curing glue, but not limited thereto) is disposed between the filter 13 and the lens barrel 11. The adhesive 14 is disposed on each of the said platform 116. The adhesive 14 is disposed on each of the said inclined surface 112. The adhesive 14 is disposed at intervals between the optical lens 121 and the lens barrel 11 (for example, an annular groove 1213 is formed between the non-optical area 1212 of the optical lens 121 and the lens barrel 11. The adhesive 14 flows into part of the annular groove 1213. The adhesive 14 is only located in the annular groove 1213 corresponding to each of the said inclined surface), so as to simultaneously fix the filter 13 and the optical lens 121 of the optical lens group 12.

[0042] In the above embodiments, the adhesive 14 may fill or partially fill the space between the filter 13 and the lens barrel 11, depending on the material properties or the size design of the lens module 1.

[0043] The embodiments described above are merely preferred embodiments for fully illustrating the present invention, and the scope of protection of the present invention is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on the present invention are all within the scope of protection of the present invention. The scope of protection of the present invention is defined by the claims.

Claims

1. A lens module defining a central axis, an object side, and an image side located opposite the object side, characterized in that, Also includes: A lens barrel includes an inner annular surface surrounding the central axis and an outer annular surface opposite to and surrounding the inner annular surface, wherein the inner annular surface forms an accommodating space; as well as An optical lens assembly and a filter are sequentially disposed within the accommodating space from the object side to the image side; The lens barrel further includes an annular structure disposed on the inner annular surface and surrounding the central axis. The annular structure includes at least two stepped portions and at least two inclined portions, each of the stepped portions and each of the inclined portions being close to the image side, and the filter being disposed on each of the stepped portions; and; Each of the stepped portions and each of the inclined portions are alternately arranged along a ring-shaped path along the inner annular surface.

2. The lens module as described in claim 1, further comprising an adhesive, characterized in that, It is disposed between the filter and the lens barrel, and on each of the inclined surfaces.

3. The lens module as described in claim 2, characterized in that, The optical lens assembly includes an optical lens, and the adhesive is disposed between the optical lens and the lens barrel.

4. The lens module as described in claim 2, characterized in that, Each of the stepped portions includes a groove adjacent to the inner annular surface, and the adhesive is disposed within each of the grooves.

5. The lens module as described in claim 4, characterized in that, The annular structure further includes at least two platforms, each platform being disposed between each inclined surface and the inner annular surface, and the adhesive being disposed on each platform.

6. The lens module as described in claim 5, characterized in that, The optical lens assembly includes an optical lens, and the adhesive is spaced between the optical lens and the lens barrel.

7. The lens module as described in claim 5, characterized in that, Each of the said platforms and one bottom of each of the said grooves are coplanar.

8. The lens module as described in claim 5, characterized in that, Each of the aforementioned beveled surfaces is connected to the corresponding platform.

9. The lens module as described in claim 2, characterized in that, Each of the aforementioned beveled surfaces is connected to the inner annular surface.

10. The lens module as described in claim 1, characterized in that, Each of the stepped portions has a local circumference of C2 along the annular path of the inner ring surface, and the annular structure has a complete circumference of C1 along the annular path of the inner ring surface, satisfying the following condition: 0.25 <C2 / C1<0.75。 11. The lens module as described in claim 1, characterized in that, Each of the inclined surfaces of the aforementioned inclined portion has an included angle Ɵ1 with the central axis, and satisfies the following condition: 5 o <Ɵ1<85 o .

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