TWI448764B - Lens module - Google Patents

Description

Lens module

The present invention relates to an optical system, and more particularly to a lens module.

With the development of camera technology, the lens module has been widely used in camera devices for various purposes. A conventional lens module generally includes a lens holder, a lens barrel screwed to the lens holder, and a lens group, a spacer ring, and a filter housed in the lens barrel. When focusing, the lens barrel is screwed into or out of the lens holder by rotating the focusing ring on the lens barrel to adjust the distance between the lens group and the image sensor to obtain a better imaging effect. However, the meshing force between the mirror base and the thread of the lens barrel and the different thread may be different, resulting in uneven torque/torque between the lens barrel and the lens holder during the screwing or screwing out of the lens holder. Stable, it is difficult to accurately adjust the relative position between the lens barrel and the lens holder to achieve accurate focus.

In view of this, it is necessary to provide a lens module that can stably and accurately adjust the relative position between the lens barrel and the lens holder to achieve accurate focusing.

A lens module includes a lens barrel, a lens holder and an annular elastic member. The lens barrel includes an actuating portion and a connecting portion coaxially connected to each other, and the connecting portion is formed with a crimping portion adjacent to one end of the actuating portion, and the crimping portion forms a side toward one side of the lens holder The crimping surface is formed with an external thread portion on the outer side of the connecting portion. The lens holder is provided with a through hole for receiving the lens barrel, and the lens holder The upper end surface of the one end of the lens module is disposed, and the inner surface of the through hole is provided with an internal thread portion loosely engaged with the external thread portion. The elastic member is formed with a plurality of arched protrusions along an axial direction thereof, and the elastic member is disposed on an upper end surface of the lens holder, and the pressing surface of the lens barrel abuts against the plurality of arched protrusions. The elastic member includes a first surface opposite the lens barrel and a second surface opposite the lens holder, and the arcuate protrusion is formed on the first surface. The distance between the ends of the arched protrusions and the first surface is defined as the span X of the arched protrusions. In a preferred embodiment, the span X satisfies the conditional formula: 2 mm < X < 3mm.

Compared with the prior art, the lens module of the present invention uses an elastic element to lock the lens barrel and the lens holder, so that the locking force between the lens barrel and the lens holder is uniform, thereby stably and accurately adjusting the lens barrel and the mirror. The relative position between the seats for accurate focus.

10‧‧‧Lens module

11‧‧‧Mirror tube

12‧‧‧Mirror base

13‧‧‧Flexible components

111‧‧‧Operation Department

112‧‧‧Connecting Department

112a‧‧‧External thread

111a‧‧‧ Groove

1121‧‧‧ crimping department

1121a‧‧‧ Crimp joint

121‧‧‧through hole

122‧‧‧ upper end

123‧‧‧ lower end

121a‧‧‧Threaded Department

131‧‧‧ first surface

132‧‧‧ second surface

1311‧‧‧ arched protrusion

1 is a perspective exploded view of a lens module according to a preferred embodiment of the present invention.

FIG. 2 is a perspective exploded view showing another angle of the lens module of FIG. 1. FIG.

FIG. 3 is a schematic perspective view of the lens module of FIG. 1 .

4 is a cross-sectional view of the lens module shown in FIG. 3 taken along the IV-IV direction.

Figure 5 is a top plan view of the elastic member of the lens module of Figure 1.

Figure 6 is a cross-sectional view of the elastic member of Figure 5 taken along line VI-VI.

The present invention will be specifically described below with reference to the accompanying drawings.

As shown in FIG. 1 to FIG. 4, a lens module 10 according to a preferred embodiment of the present invention includes a lens barrel 11, a lens holder 12 and an elastic member 13.

The inside of the lens barrel 11 houses elements such as a lens group, a spacer ring, and a filter (not shown). The lens barrel 11 includes an actuating portion 111 and a connecting portion 112 in order from the object side to the image side. The edge of the actuating portion 111 is evenly spaced apart to provide a plurality of grooves 111a for facilitating rotation of the actuating portion 111. The connecting portion 112 has a cylindrical shape and is coaxially connected to the operating portion 111. The connecting portion 112 forms a crimping portion 1121 adjacent to one end of the operating portion 111, and the crimping portion 1121 forms a crimping surface 1121a toward one side of the lens holder 12. A male screw portion 112a is formed on the outer side of the connecting portion 112 away from one end of the actuating portion 111.

The lens holder 12 has a cylindrical shape, and defines a through hole 121 for receiving the lens barrel 11. The lens holder 12 includes an upper end surface 122 facing the object side of the lens module 10, and A lower end surface 123 of the image module 10 on the image side. The through hole 121 forms a shaft fit with the connecting portion 112 of the lens barrel 11. The through hole 121 is provided with an internal thread portion 121a corresponding to the external thread portion 112a of the connecting portion 112.

The tooth thickness of the outer thread portion 112a of the lens barrel 11 is smaller than the pitch of the inner thread portion 121a of the lens holder 12. Thus, in the process of screwing or screwing the lens barrel 11 out of the lens holder 12, the meshing force between the male screw portion 112a and the female screw portion 121a is extremely small. When the focus is adjusted, the meshing force between the external thread portion 112a and the internal thread portion 121a can be easily overcome, and the lens barrel 11 can be stably screwed or screwed out of the lens holder 12 to accurately focus.

Preferably, the number of turns of the external thread portion 112a and the internal thread portion 121a is 2 to 3 turns, whereby the loose fitting of the external thread portion 112a and the internal thread portion 121a can be easily achieved, and the mirror is convenient. Processing of the barrel 11 and the mirror base 12.

The elastic member 13 is an annular structure including a first surface 131 opposite to the lens barrel 11 and a second surface 132 opposite to the lens holder 12. In the present embodiment The elastic member 13 is a metal foil. A plurality of arched protrusions 1311 are uniformly formed on the first surface 131 along the axial direction of the elastic member 13. In the embodiment, the first surface 131 of the elastic member 13 is uniformly formed with four arches. Protrusion 1311.

5 and FIG. 6, the distance between the ends of the arched protrusions 1311 and the first surface 131 is defined as the span X of the arched protrusions 1311. In a preferred embodiment, The span X satisfies the conditional expression: 2 mm < X < 3 mm. The distance from the dome of the arched protrusion 1311 to the second surface 132 is defined as the dome height h of the arched protrusion 1311, and the thickness of the elastic member 13 is t, which in the preferred embodiment satisfies Conditional formula: 2 < h / t < 3.5.

During the assembly process, the elastic member 13 is placed on the upper end surface 122 of the lens holder 12, and the second surface 132 of the elastic member 13 is brought into contact with the upper end surface 122, and then the mirror is The barrel 11 is screwed into the through hole 121 of the lens holder 12 until the crimping surface 1121a comes into contact with the arched protrusion 1311 of the elastic member 13, and the elastic member 13 is pressed. When the elastic member 13 is compressed, a stable force is applied to the pressing surface 1121a and the upper end surface 122, so that the loose fitting outer thread portion 112a and the female thread portion 121a abut against each other to form a locking force, that is, The force of the elastic member 13 allows the lens barrel 11 and the lens holder 12 to be locked to each other. When the lens module 10 is adjusted, it is mainly necessary to overcome the force generated by the elastic member 13 to screw or screw the lens barrel 11 out of the lens holder 12, thereby stably holding the lens barrel 11 The mirror base 12 is screwed or screwed out to achieve accurate focusing.

It can be understood that in another embodiment, the tooth thickness of the inner thread portion 121a of the lens holder 12 may be smaller than the pitch of the outer thread portion 112a of the lens barrel 11. That is, only the tooth thickness of the internal thread portion 121a of the lens holder 12 and the external thread portion 112a of the lens barrel 11 are required. Just loose fit.

Compared with the prior art, the lens module of the present invention uses an elastic element to lock the lens barrel and the lens holder, so that the locking force between the lens barrel and the lens holder is uniform, thereby stably and accurately adjusting the lens barrel and the mirror. The relative position between the seats for accurate focus.

In addition, those skilled in the art can make other changes in the spirit of the present invention. Of course, the changes made in accordance with the spirit of the present invention should be included in the scope of the present invention.

10‧‧‧Lens module

11‧‧‧Mirror tube

12‧‧‧Mirror base

13‧‧‧Flexible components

111‧‧‧Operation Department

112‧‧‧Connecting Department

111a‧‧‧ Groove

112a‧‧‧External thread

1121‧‧‧ crimping department

131‧‧‧ first surface

1311‧‧‧ arched protrusion

121‧‧‧through hole

122‧‧‧ upper end

121a‧‧‧Threaded Department

Claims (6)

A lens module includes a lens barrel, a lens holder and an annular elastic member; the lens barrel includes an actuating portion and a connecting portion coaxially connected to each other, the connecting portion abutting one end of the actuating portion Forming a crimping portion, the crimping portion forms a crimping surface toward one side of the lens holder, and an outer threaded portion is formed on an outer side of the connecting portion; the mirror holder is configured to receive the lens barrel a through hole, the lens holder includes an upper end surface facing the end side of the lens module, the inner surface of the through hole is provided with an internal thread portion loosely engaged with the external thread portion; the elastic member is formed along the axial direction a plurality of arched protrusions, the elastic member is disposed on an upper end surface of the lens holder, the pressing surface of the lens barrel is pressed against the plurality of arched protrusions, and the elastic member includes the lens barrel The arcuate protrusion is formed on the first surface opposite to the first surface and the second surface opposite to the mirror holder, between the two ends of the arched protrusion and the first surface The distance is defined as the span X of the arched protrusion, in comparison In a preferred embodiment, the span X satisfies the conditional formula: 2 mm < X < 3 mm. The lens module of claim 1, wherein: the edge of the actuating portion is evenly spaced to provide a plurality of grooves for facilitating rotation of the actuating portion. The lens module of claim 1, wherein: the tooth thickness of the external thread of the lens barrel is smaller than the pitch of the internal thread of the lens holder. The lens module of claim 1, wherein: a distance from a dome of the arched protrusion to the second surface is defined as a height h of the arched protrusion, the elastic element The thickness is t, and in a preferred embodiment, the conditional expression is satisfied: 2 < h/t < 3.5. The lens module of claim 1, wherein the elastic member is a metal foil. The lens module of claim 1, wherein: the external thread portion and the inner screw The number of threads in the pattern is 2 to 3 turns.