TW201305643A - Lens module - Google Patents

Abstract

A lens module comprises a fixed cylinder, a cam cylinder, and at least one bolt. The cylinder wall of the fixed cylinder has at least one long perforation, and the length of the long perforation in the first direction parallel to the optical axis of the lens module is greater than that in the second direction perpendicular to the first direction. The cam cylinder is in connection with the fixed cylinder. The cylinder wall of the cam cylinder has at least one threaded hole, and the threaded hole is in connection with the long perforation. The bolt has a connected body section with a head section, and the outer diameter of the head section is greater than that of the body section. The body section passes through the long perforation to screw with the threaded hole. The head section is pressed against the cylinder wall of the fixed cylinder.

Description

Lens module

The invention relates to optical devices and, more particularly, to a lens module.

With the advancement of imaging technology, imaging devices and their optical lenses are increasingly sophisticated in design. However, in the packaging process of optical lenses, it is inevitable that some errors or tolerances will occur during fabrication or assembly, when the above errors or tolerances occur. After the accumulation, the optical lens is likely to be displaced after the assembly of the optical lens, and the image blur is generated, which causes the image quality of the image device having the lens to be low.

In order to solve the above problem of back focus shift, most of the optical lens is equipped with a spacer on the back side to compensate the offset of the back focus. However, the focus shift of each optical lens is not the same, so if If the above method is used for post-focus compensation, a variety of gaskets of different thicknesses must be produced, which will inevitably lead to cost increase.

Referring to FIG. 1 , in order to solve the above disadvantages, a lens module 2 is mainly developed, which mainly includes a fixed cylinder 100 , a cam cylinder 150 and a plurality of bolts 200 . The fixed cylinder 100 has a plurality of screw holes 110. The cam cylinder 150 is disposed in the fixed cylinder 100 and can be moved along the optical axis of the lens module 2 to compensate for the back focus shift. The bolts 200 are screwed into each of the screw holes 110. Thereby, when the position of the back focus compensation of the cam barrel 150 is fixed, the effect of fixing the cam barrel 150 is achieved by the bolts 200 passing through one end of the screw hole 110 against the cam barrel 150.

However, although the design of FIG. 1 can achieve the purpose of compensating for the back focus shift, the manner in which the bolt 200 is directly pressed against the cam barrel 150 will easily cause the cam barrel 150 to be deformed or tilted, which will result in The cam barrel 150 is pressed against the other lens barrel for zooming, thereby increasing the load of the zoom drive motor, and moreover, the zoom drive motor is moved with the fixed barrel. Therefore, based on the above, it can be known that the design of the post-compensation post-focus offset is still not perfect, and there is still room for improvement.

In view of this, the main object of the present invention is to provide a lens module that not only achieves the purpose of compensating for back focus shift, but also does not cause deformation or tilting of the cam barrel.

To achieve the above objective, the lens module provided by the present invention comprises a fixed cylinder, a cam cylinder and at least one bolt. Wherein the wall of the fixed cylinder has at least one elongated perforation, and the length of the elongated perforation in a first direction parallel to the optical axis of the lens module is greater than a second direction perpendicular to the first direction The length of the cam barrel is disposed in the fixing cylinder; the cylinder wall of the cam barrel has at least one screw hole, and the screw hole communicates with the long perforation; the bolt has a connecting body and a head. And the outer diameter of the head is larger than the outer diameter of the body; the body is screwed through the long hole and the screw hole; the head is pressed against the wall of the fixed cylinder.

Therefore, the above-mentioned structural design can not only achieve the purpose of compensating the back focus shift by moving the cam barrel, but also the method of directly locking the bolt to the screw hole of the cam barrel, and the deformation of the cam barrel is not caused. Or the phenomenon of tilting occurs.

In order that the present invention may be more clearly described, the preferred embodiments are illustrated in the accompanying drawings.

Referring to FIG. 2, a lens module 1 according to a preferred embodiment of the present invention includes a fixed cylinder 10, a cam cylinder 20, a rotating cylinder 30, a first mirror group frame 40, a second mirror group frame 50, and six Bolt 60. Wherein, referring to FIG. 3, the wall of the fixed cylinder 10 has three first grooves 11 and three second grooves 12 arranged in an equidistant manner, and each of the first grooves 11 and Each of the second recesses 12 is disposed on the wall of the fixed cylinder 10 in a first direction D1 parallel to the optical axis of the lens module 1. The groove bottoms of the grooves 11, 12 respectively have an elongated perforation 13 and the inner diameter of each of the grooves 11, 12 is larger than the inner diameter of the elongated perforation 13. In addition, referring to FIG. 4, the length L1 of each of the elongated through holes 13 in the first direction D1 is greater than the length L2 of the second direction D2 perpendicular to the first direction D1. Further, each of the first recesses 11 and the second recesses 12 arranged along the first direction L1 respectively have an air escaping hole 14 extending through the wall of the fixed cylinder 10.

The cam barrel 20 is fixed in the fixed cylinder 10. Each of the equidistant perforations 13 corresponding to the fixed cylinder 10 has a screw hole 21 in the wall of the cylinder tube 20, and the screw holes 21 communicate with the long perforations 13 respectively. In addition, the cam barrel 20 has three cam holes 22 having a certain length and extending in the first direction D1.

The rotating cylinder 30 is disposed in the cam barrel 20, and the rotating cylinder 30 is rotatable in the cam barrel 20 by means of a motor (not shown). In addition, the cylinder wall of the rotating cylinder 30 has three first guiding holes 31 and three second guiding holes 32 respectively communicating with the respective cam holes 22.

A lens group 70, 75 is respectively disposed in the first mirror group frame 40 and the second mirror group frame 50. In addition, the first mirror group frame 40 and the outer surface of the second mirror group frame 50 respectively have three convex axes 41 and 51, and the convex axes 41 of the first mirror group frame 40 are respectively disposed through Each of the first guiding holes 31 and each of the cam holes 22, and the protruding shafts 51 of the second mirror group frame 50 are respectively located in the second guiding holes 32 and the respective cam holes 22. Therefore, when the rotating cylinder 30 is rotated by the motor, the first mirror group frame 40 and the second mirror group frame 50 are respectively guided by the first guiding hole 31 and the second guiding hole 32. Move along the cam hole 22 to achieve the purpose of zooming.

Referring to FIG. 5, the bolts 60 respectively have a head portion 61 and a body portion 62 connected thereto, and the outer diameter of the head portion 61 is larger than the outer diameter of the body portion 62. The body portions 62 of the bolts 60 are respectively threaded through the respective long holes 13 and screwed into the corresponding screw holes 21, and the heads 61 of the bolts 60 are respectively pressed against the grooves 11 and 12. The bottom of the groove.

Therefore, when the lens module 1 is assembled and found to have a phenomenon of back focus shift, the positions of the cam barrel 20 can be adjusted by loosening the bolts 60, thereby achieving the purpose of back focus offset compensation. After the adjustment is completed, the heads 61 of the bolts 60 are pressed against the bottoms of the grooves 11 and 12 by tightening the bolts 60 to fix the position of the cam barrel 20, and the above fixing is performed. The method also does not cause deformation or tilting of the cam barrel 20 due to pressing against the cam barrel 20, so that when the motor drives the rotating barrel 30 to rotate, no load lifting occurs.

In addition, the design of the escape holes 14 can guide the outside and the inside of the fixed cylinder 10, thereby avoiding a vacuum phenomenon between the fixed cylinder 10 and the cam cylinder 20, thereby improving the efficiency of the back focus adjustment.

Furthermore, in addition to the above structure, the fixed cylinder and the cam cylinder of the present invention may also be designed as a fixed cylinder 80 and a cam cylinder 90 as shown in FIG. 6, which is different from the fixed cylinder 10 of the previous embodiment in that The long perforations 83 are not arranged on the wall of the fixed cylinder 80 in the first direction D1 along the parallel optical axis, but are disposed in a staggered manner on the wall of the fixed cylinder 80, and the cam The cylinder 90 is also provided with a screw hole 91 corresponding to the elongated hole 83. Thereby, through the above design, the force of locking the bolts 95 can be alternately distributed on the cam cylinder 90, thereby achieving the purpose of lifting and fixing the cam cylinder 90.

The above description is only for the preferred embodiments of the present invention, and the equivalent structures and manufacturing methods of the present invention and the scope of the patent application are intended to be included in the scope of the present invention.

1. . . Lens module

10. . . Fixed cylinder

11. . . First groove

12. . . Second groove

13. . . Long perforation

L1. . . length

L2. . . length

14. . . Escape hole

20. . . Cam barrel

twenty one. . . Screw hole

twenty two. . . Cam hole

30. . . Rotating cylinder

31. . . First guiding hole

32. . . Second guiding hole

40. . . First mirror group

41. . . Convex axis

50. . . Second mirror group

51. . . Convex axis

60. . . bolt

61. . . head

62. . . Body

70, 75. . . Lens group

80. . . Fixed cylinder

83. . . Long perforation

90. . . Cam barrel

91. . . Screw hole

95. . . bolt

D1. . . First direction

D2. . . Second direction

100. . . Fixed cylinder

110. . . Screw hole

150. . . Cam barrel

200. . . Screw

1 is a cross-sectional view of a conventional lens module.

2 is an exploded view of the lens module of the present invention.

Figure 3 is a perspective view of the fixing cylinder of the present invention.

Figure 4 is a structural view of a long perforation of the present invention.

Figure 5 is a cross-sectional view of the lens module of the present invention.

Figure 6 is a perspective view of a fixed cylinder and a cam cylinder according to another embodiment of the present invention.

1. . . Lens module

10. . . Fixed cylinder

11. . . First groove

12. . . Second groove

13. . . Long perforation

14. . . Escape hole

20. . . Cam barrel

twenty one. . . Screw hole

twenty two. . . Cam hole

30. . . Rotating cylinder

31. . . First guiding hole

32. . . Second guiding hole

40. . . First mirror group

41. . . Convex axis

50. . . Second mirror group

51. . . Convex axis

60. . . bolt

61. . . head

62. . . Body

70, 75. . . Lens group

Claims (6)

A lens module includes: a fixed cylinder having at least one elongated perforation in a wall thereof, and the length of the elongated perforation in a first direction parallel to an optical axis of the lens module is greater than a vertical a length in a second direction of the direction; a cam barrel is disposed in the fixed cylinder; the cylinder wall of the cam barrel has at least one screw hole, and the screw hole is in communication with the elongated perforation; and at least one bolt, Having a connected body and a head, and the outer diameter of the head is larger than the outer diameter of the body; the body is screwed through the long hole and the screw hole; the head is pressed against the fixed On the wall of the tube. The lens module of claim 1, wherein the cylinder wall of the fixing cylinder has at least one groove, the groove bottom of the groove has the long perforation, and the inner diameter of the groove is larger than the long perforation. The inner diameter; in addition, the head of the bolt is pressed against the groove bottom of the groove. The lens module of claim 1, wherein the cylinder wall of the fixing cylinder has two long perforations, and the perforated perforations are arranged along the first direction on the cylinder wall of the fixing cylinder. . The lens module of claim 3, wherein the fixing cylinder is further provided with an air escaping hole on the wall between the two long perforations. The lens module of claim 1, wherein the fixed cylinder has three elongated perforations on the wall of the cylinder, and the elongate perforations are disposed in the cylinder of the fixed cylinder in an equidistant manner. On the wall. The lens module of claim 1, wherein the cylinder wall of the fixing cylinder has a plurality of the elongated perforations, and the perforated perforations are disposed in a staggered manner on the wall of the fixing cylinder. on.