TWI391775B - Lens module - Google Patents

Description

Lens module

The invention relates to a lens module, in particular to a lens module capable of positioning and locking a lens barrel and a lens holder.

Lens modules are widely used in cameras or optical instruments, and are usually composed of a lens barrel, a lens holder, and optical elements in the lens barrel. In the production process of the lens module, the optical components such as the lens, the support post, the spacer ring and the filter are sequentially assembled into the lens barrel, and then the lens barrel is screwed into the lens holder. 1 is a lens module 100 including a lens holder 12, a lens barrel 14 and a focusing ring 15. One end of the lens holder 12 is provided with a bottom plate 16, and the outer wall of the lens barrel 14 and the inner wall of the lens holder 12 are provided with a thread, and the lens barrel 14 is provided. Screwed into the lens holder 12 by a threaded fit.

When the lens holder 14 and the lens barrel 16 are locked, since the thread provided on the outer wall of the lens barrel 14 has a certain inclination angle, when the lens holder 12 is in contact with the lens barrel 14, a mirror is caused. The seat 12 has a certain degree of inclination, which causes a large range of tilting and swaying of the positioning of the lens holder 12 and the lens barrel 14 before locking, so that the locking operation cannot be performed. As shown in FIG. 2, the thread corresponding to the lens barrel is difficult to be aligned during the locking process, which makes the locking difficulty increase, and the process of positioning and locking the lens barrel and the lens holder is expensive. Manpower and time, and because the lens barrel and the lens holder are misaligned, the lens barrel and the mirror base thread are damaged, and even the lens barrel and the lens holder may be damaged. Such a phenomenon may affect the camera module. Production efficiency and production yield.

In view of this, it is necessary to provide an accurate positioning of the lens barrel and the lens holder. Lock the lens module.

A lens module includes a lens barrel and a lens holder; the outer surface of the lens barrel is provided with an external thread portion, and the inner surface of the lens holder is provided with an internal thread portion for receiving the lens barrel. At least one of the lens barrel and the lens holder is provided with a positioning structure that is connected to the respective threaded portion in the optical axis direction for aligning the lens barrel into the lens holder when the lens module is assembled.

Compared with the prior art, during the assembly process of the lens barrel and the lens holder, the positioning structure of the lens barrel and the lens holder can be aligned before screwing, so that the lens barrel and the lens holder can be accurately aligned. After the locking action is performed, the lens barrel and the lens holder can be locked and locked in a fast and accurate manner, thereby avoiding damage to the thread of the lens barrel and the lens holder or even damage to the lens barrel and the lens holder itself. The positioning structure is disposed on the lens barrel and/or the lens holder, and the assembly is simple and convenient, thereby greatly improving assembly efficiency and production yield.

The invention will be further described in detail below with reference to the accompanying drawings.

Referring to FIG. 3 , FIG. 3 is a lens module 200 according to a first embodiment of the present invention. The lens module 200 includes a lens barrel 21 , a focusing ring 22 , a lens holder 23 , and a bottom plate 26 . The lens barrel 21 includes a threaded portion 24 and a positioning portion 25. The positioning portion 25 is a hollow cylinder, and the positioning portion 25 is a positioning structure.

The positioning portion 25 is connected away from the screw-in side to the threaded portion 24, and one end of the threaded portion 24 is connected to the focus ring 22. The lens holder 23 is connected to the bottom plate 26 from one end of the screw-in side, and the inner wall of the lens holder 23 is provided with a thread that cooperates with the threaded portion 24.

As shown in FIG. 3, when the lens holder 23 and the lens barrel 21 are locked, since the outer wall of the lens barrel 21 is provided with a positioning portion 25 at one end of the focusing ring 22, the outer surface of the positioning portion 25 is not The inner diameter of the positioning portion 25 is equal to the inner diameter of the threaded portion 24, and the outer diameter of the positioning portion 25 is smaller than the inner diameter of the lens holder 23. The positioning portion 25 is directly inserted into the lens holder 23, and the axis of the lens barrel 21 and the lens holder 23 can be corrected to be coincident, so that there is an accurate pair between the lens holder 23 and the lens barrel 21. Bit. When the lens holder 23 is aligned with the lens barrel 21, the amplitude of the shaking is greatly reduced, so that the lens holder 23 and the lens barrel 21 can be accurately aligned and quickly locked.

Referring to FIG. 4 , FIG. 4 illustrates a lens module 300 according to a second embodiment of the present invention. The lens module 300 includes a lens barrel 31 , a focusing ring 32 , a lens holder 33 , and a bottom plate 36 . The lens holder 33 includes a threaded portion 34 and a positioning portion 35. The positioning portion 35 is a hollow cylinder whose inner wall is not threaded. The positioning portion 35 is a positioning structure.

The outer surface of the lens barrel 31 is provided with a thread that cooperates with the threaded portion 34, and one end of the lens barrel 31 is connected to the focus ring 32. The positioning portion 35 is connected away from the screw-in side end wall to the threaded portion 34 of the lens holder 33, and the mirror holder 33 is connected to the bottom plate 36 away from one end of the screw-in side.

The outer diameter of the positioning portion 35 is equal to the outer diameter of the lens holder 33, the inner diameter of the positioning portion 35 is larger than the inner diameter of the inner thread portion 34 of the lens holder 33, and the inner diameter of the positioning portion 35 is larger than The outer diameter of the lens barrel 31 is described. The length of the lens barrel 31 along the axial direction is the sum of the length of the thread portion 34 along the axial direction and the length of the positioning portion 35 in the axial direction, and the length of the positioning portion 35 in the axial direction is smaller than the length. The length of the lens barrel 31 in the axial direction.

As shown in FIG. 4, when the lens holder 33 and the lens barrel 31 are locked, since the inner wall of the lens holder 33 is provided with a positioning portion 35 at one end of the bottom plate 36, the lens barrel 31 is directly inserted. In the case of the lens holder 33, the positioning portion 35 can correct the axis of the lens barrel 31 and the lens holder 33 so as to have an accurate alignment between the lens holder 33 and the lens barrel 31. When the lens holder 33 is aligned with the lens barrel 31, the amplitude of the shaking is greatly reduced, so that the lens holder 33 and the lens barrel 31 can be accurately aligned and quickly locked.

It can be understood that the lens holder is disposed away from one end of the bottom plate and one end of the lens barrel away from the focus ring is provided with a positioning portion, and the positioning portion is not provided with a thread, and the lens barrel and the lens holder are provided with matching threaded portions.

5 and FIG. 6 , FIG. 5 is a lens module 400 according to a third embodiment of the present invention. FIG. 6 is another perspective view of the lens module according to the embodiment, which includes a lens barrel 41 and a lens. A focus ring 42, a mirror base 43 and a bottom plate 48.

The lens barrel 41 includes an external thread portion 45 and a barrel positioning portion 46. The thread portion 45 is provided with a recess 47. The inner wall of the lens holder 43 includes an internal thread portion 51, a lens holder positioning portion 52, and a protrusion 54 corresponding to the groove 47. The lens barrel positioning portion 46 is connected to the focus ring 42 at one end away from the screw-in side, and one end of the lens holder 43 away from the screw-in side is connected to the bottom plate 48. The lens barrel positioning portion 46, the lens holder positioning portion 52, the groove 47, and the bump 54 are positioning structures.

The length of the groove 47 in the axial direction is equal to the length of the threaded portion 45 in the axial direction, and the depth of the groove 47 is greater than or equal to the depth of the thread. The outer diameter of the barrel positioning portion 46 is smaller than the outer diameter of the external thread portion 45. The inner diameter of the barrel positioning portion 46 is equal to the inner diameter of the threaded portion 45.

Referring to FIG. 7 , the length of the lens holder positioning portion 52 in the axial direction is d ₁ , and the length between the protrusion 54 and the internal thread portion 51 in the axial direction is d ₁₁ , the protrusion 54 The length along the axis is d ₁₂ , where d ₁ =d ₁₁ +d ₁₂ . The length of the threaded portion 45 in the axial direction is d ₂ , the length of the barrel positioning portion 46 in the axial direction is d ₃ , and the length of the internal thread portion 51 in the axial direction is d ₄ , where d ₂ ≦ d ₁₁ , d1 < (d ₂ + d ₃ ), (d ₂ + d ₃ ) ≦ (d ₁ + d ₄ ), d ₂ is matched with d ₄ , and the bump 54 is matched with the groove 47 .

It can be understood that the plurality of grooves 47 can be disposed, and at the same time, the plurality of bumps 44 matched with the grooves 47 are correspondingly disposed.

As shown in FIGS. 7, 8, and 9, FIGS. 7, 8, and 9 are cross-sectional views of the lens module 400 of FIG. 5 in the optical axis direction during assembly. As shown in FIG. 7, when the lens holder 43 and the lens barrel 41 are locked, the protrusion 54 is first aligned with the groove 47, thereby pushing the protrusion 44 to follow the position. The groove 47 slides in. At this time, the lens holder 43 has a certain alignment with the lens barrel 41. Since d ₂ ≦d ₁₁ and d ₁ <(d ₂ +d ₃ ), the protrusion 54 cooperates with the groove 47 to make the seat. The bump 54 is slid to the innermost end of the external thread portion 45, as shown in FIG. 8, at which time the lens holder positioning portion 52 is at a position corresponding to the groove 47. After the alignment process is completed, the lens holder 43 and the lens barrel 41 start to be locked, and since the outer diameter of the external thread portion 45 is larger than the outer diameter of the lens barrel positioning portion 46, the locking operation is performed. The bump 54 is moved downward with the locking of the lens holder 43 because (d ₂ + d ₃ ) ≦ (d ₁ + d ₄ ), so that the lens holder 43 and the lens barrel 41 can be completely ensured. Locking, as shown in FIG. 9, when the length of the barrel positioning portion 46 in the axial direction is equal to the sum of the length of the projection 54 in the axial direction and the length of the mirror positioning portion 52 in the axial direction The lock is in the end state.

In summary, the present invention has indeed met the requirements of the invention patent, and has filed a patent application according to law. However, the above description is only a preferred embodiment of the present invention, and the scope of the present invention is not limited to the above-described embodiments, and equivalent modifications or variations made by those skilled in the art in accordance with the spirit of the present invention are It should be covered by the following patent application.

Convention:

100‧‧‧ lens module

12‧‧‧Mirror base

14‧‧‧Mirror tube

15‧‧‧focus ring

16‧‧‧floor

this invention:

200‧‧‧ lens module

21‧‧‧Mirror tube

22‧‧‧ Focus ring

23‧‧‧Mirror base

24‧‧‧External thread

25‧‧‧Mirror Positioning Department

26‧‧‧floor

300‧‧‧Lens module

31‧‧‧Mirror tube

32‧‧‧focus ring

33‧‧‧Mirror base

34‧‧‧Threaded Department

35‧‧‧Mirror Positioning Department

36‧‧‧floor

400‧‧‧Lens module

41‧‧‧Mirror tube

42‧‧‧focus ring

43‧‧‧Mirror base

45‧‧‧External thread

46‧‧‧Mirror Positioning Department

47‧‧‧ Groove

48‧‧‧floor

51‧‧‧Threaded Department

52‧‧‧Mirror Positioning Department

54‧‧‧Bumps

FIG. 1 is a schematic diagram of a lens module of the prior art.

2 is a schematic view showing the assembly of the lens module of FIG. 1.

FIG. 3 is a schematic diagram of a lens module according to a first embodiment of the present invention.

4 is a schematic view of a lens module according to a second embodiment of the present invention.

FIG. 5 is a schematic diagram of a lens module according to a third embodiment of the present invention.

6 is a schematic view of another direction of the lens module of FIG. 5.

Figure 7 is a cross-sectional view of Figure 5 along the optical axis.

8 is a cross-sectional view of the lens module of FIG. 5 along the optical axis during assembly.

9 is a cross-sectional view of the lens module of FIG. 5 taken along the optical axis direction after assembly.

400‧‧‧Lens module

41‧‧‧Mirror tube

42‧‧‧focus ring

43‧‧‧Mirror base

45‧‧‧External thread

46‧‧‧Mirror Positioning Department

47‧‧‧ Groove

48‧‧‧floor

51‧‧‧Threaded Department

52‧‧‧Mirror Positioning Department

54‧‧‧Bumps

Claims (4)

a lens barrel, the outer surface of the lens barrel is provided with an external thread portion, the lens barrel is provided with a first positioning portion, the first positioning portion is connected with the external thread portion of the lens barrel, and the outer surface of the lens barrel is provided with at least one groove Each of the grooves extends in the axial direction and penetrates the threaded portion outside the lens barrel; a lens holder, the inner surface of the lens holder is provided with an internal thread portion for receiving the lens barrel, and the lens holder is provided with a first a positioning portion and at least one protrusion, the second positioning portion is connected to the threaded portion of the lens holder, and each of the protrusions corresponds to a groove for guiding the lens barrel into the lens holder; the first positioning portion, the first positioning portion The second positioning portion, the bump and the groove are used for aligning the lens barrel into the lens holder when the lens module is assembled. The lens module of claim 1, wherein the first positioning portion is a first hollow cylinder, and the second positioning portion is a second hollow cylinder, the first hollow cylinder The outer diameter of the body is smaller than the inner diameter of the inner thread portion of the lens holder, and the inner diameter of the second hollow cylinder is larger than the outer diameter of the outer thread portion of the lens barrel. The lens module of claim 1, wherein the length of the second positioning portion in the axial direction is smaller than the length of the external thread portion of the lens barrel in the axial direction. The lens module of claim 3, wherein the length of the lens holder in the axial direction is greater than or equal to the length of the external thread portion of the lens barrel in the axial direction.