TWI397729B - Lens module - Google Patents

Description

Lens module

The invention relates to a lens module, in particular to a lens module equipped with a spacer.

The lens module is an important component of an imaging system, such as a digital camera, which includes components such as a lens, a lens barrel, and a mount. Most lens modules also include optical components such as filters to change the lighting conditions of the imaging system during shooting, enhance contrast, and improve its shooting. In the lens module, it is usually necessary to provide a space between the respective optical elements to prevent the adjacent optical elements from being worn by friction or collision with each other, thereby preventing the optical performance of the optical elements from deteriorating.

A method for forming a space between a lens and a filter is disclosed in the prior art, that is, during the assembly of the lens module, a circular spacer is used to be disposed between the lens and the filter in the lens barrel. The lens and the filter are spaced apart to prevent friction or collision between the mirror surface of the lens and the filter, thereby avoiding damage to optical components such as lenses and filters. Usually, in the assembly process of the lens module, the “dispensing process” is needed. The brief process is as follows: after the lenses are sequentially placed in the lens barrel, the spacers are placed in the lens, and then the UV is placed on the spacer. The glue can be cured, and the filter is placed on it and irradiated with UV light to fix the entire module. However, due to factors such as the rheology of the glue, the coating method, etc., the lens often falls off due to insufficient glue, or the glue flows into the optical effective diameter due to too much glue, which affects the image effect. In addition, when dispensing with a dispensing head on the spacer, the thickness of the spacer changes. The phenomenon of "striking the needle" occurs.

In view of this, it is necessary to provide a lens module that does not have "small glue" or "overflow" during the assembly of the lens module, and to prevent the "needle strike" phenomenon between the dispensing head and the spacer.

A lens module will be described below by way of example.

A lens module includes a lens barrel, a lens and a filter housed in the lens barrel, and a spacer between the lens and the filter, the spacer includes a first surface, and a spacer The first surface is opposite to the second surface, the first surface is adhered to the filter, and the first surface is provided with a first groove, and the spacer is provided with a stepped light-passing hole. The stepped light-passing aperture includes a first opening and a second opening, the first opening is located at the first surface, the second opening is located at the second surface and is in communication with the first opening, the first opening is larger than the second opening The step surface of the stepped light passing hole defines a first buffer portion.

Compared with the prior art, the lens module is provided with a spacer between the lens and the filter, and the first surface of the spacer and the filter is provided with a first groove for accommodating the glue. Therefore, in the process of assembling the lens module, that is, the phenomenon of “less glue” or “overflow” occurs during the dispensing process, and at the same time, the “needle strike” phenomenon of the dispensing head and the spacer can be prevented.

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

Referring to FIG. 1 , a lens module 100 according to an embodiment of the invention includes a first lens barrel 110 and a second lens barrel 120 . The first lens barrel 110 houses An image sensor 112. The second lens barrel 120 is disposed in the first lens barrel 110. The second lens barrel 120 is disposed in the first lens barrel 110. The second lens barrel 120 has a stepped through hole 121. In the stepped through hole 121, two lenses 122 and one filter 123 are sequentially accommodated, and an aperture plate 124 is disposed between the two lenses 122. A spacer 125 is disposed between the lens 122 and the filter 123.

The aperture plate 124 is disposed between the lenses 122, and can control the light throughput of the entire lens module 100 during imaging.

The spacer 125 can prevent the lens module 100 from being deteriorated in optical performance due to vibration of the lens and the filter 123 due to vibration during use.

The filter 123 can be an infrared cut filter.

The image sensor 112 can be a charge coupler image sensor (CCD) or a complementary metal-oxide semiconductor image sensor (Complementary Metal-Oxide Semiconductor, CMOS). To prevent the image sensor 112 from being contaminated, a transparent plate 114 can be used to cover the image sensor 112.

Referring to FIG. 2 and FIG. 3 simultaneously, the spacer 125 of the first embodiment included in the lens module 100 is of a ring shape, and the spacer 125 includes a first surface 1256, and a first surface 1256 is opposite to the first surface 1256. a second surface 1257 and a side surface 1258 adjacent to the first surface 1256. The first surface 1256 is adhered to the filter 123 (see FIG. 1), and the first surface 1256 is provided with a first surface. Groove 1251. Here, the first groove 1251 extends in the circumferential direction of the spacer 125, and the cross section of the first groove 1251 is V-shaped. That is, the cross section along the axial direction of the spacer 125 is V-shaped.

The stepped spacer 125 has a stepped through hole 1252. The stepped through hole 1252 includes a first opening 1253 and a second opening 1254. The first opening 1253 communicates with the second opening 1254. The first opening 1253 Larger than the second opening 1254. The stepped surface of the stepped light-passing aperture 1252 defines a buffer portion 1255, wherein the stepped surface of the stepped light-passing aperture 1252 is parallel to the first surface 1256. The first opening 1253 is aligned with the opening direction of the first recess 1251, that is, the opening of the first opening 1253 and the first recess 1251 is located on the first surface 1256, and the opening of the second opening 1254 is located at the second surface 1257. One side of the buffer portion 1255 near the middle of the spacer 125 may be slightly higher than the other side thereof. At this time, the stepped surface of the stepped light-passing hole 1252 as the buffer portion 1255 forms an angle with the first surface 1256.

The depth of the first groove 1251 is preferably 0.1 mm to 0.5 mm.

Referring to FIG. 4, the spacer 125 included in the lens module 100 of the embodiment of the present invention may be replaced by the spacer 225 of the second embodiment of the present invention. The spacer 225 has substantially the same structure as the spacer 125, except that the first recess 2251 has a stepped cross section, and the opening of the first recess 2251 is larger than the bottom surface thereof; and is disposed on the buffer portion 2255. There is a blocking block 2256, where the blocking block 2256 is disposed at the edge of the buffer portion 2255 near the center of the spacer 225 for blocking the flow of the UV curable glue into the optically effective diameter. Here, the position and shape of the blocking block 2256 can be arbitrarily designed, and the blocking block 2256 and the spacer 225 can also be integrated, as long as the blocking block 2256 can effectively block the flow of the UV curable glue into the optical effective diameter of the lens module 100. Just fine.

Referring to FIG. 5, the spacer 125 included in the lens module 100 of the embodiment of the present invention may be replaced by the spacer 325 of the third embodiment of the present invention. The spacer 325 has substantially the same structure as the spacer 125, except that the first recess 3251 has a circular arc shape; and the buffer portion 3255 is provided with a second recess 3256. Here, the spacer The two grooves 3256 are disposed in a middle portion of the buffer portion 3255. The second groove 3256 has a V-shaped cross section, and the second groove 3256 may have the same cross section as the first groove 3251.

Referring to FIG. 6, the spacer 125 included in the lens module 100 of the embodiment of the present invention may be replaced by the spacer 425 of the fourth embodiment of the present invention. The spacer 425 has substantially the same structure as the spacer 125, except that a second recess 4256 is disposed on the buffer portion 4255. Here, the second recess 4256 is disposed in a middle portion of the buffer portion 4255. The cross section of the second recess 4256 is similar to the first recess 4251. For example, the cross section of the second recess 4256 is triangular, serrated. Shape, arc shape, etc. At the same time, a flange (Flange) 4254 is disposed on the end of the spacer 425 near the second surface 4257. The surface of the flange 4254 intersecting the side surface 4258 of the spacer 425 defines a buffer portion 4252 on the buffer portion 4252. A second recess 4256 is disposed. The second recess 4256 is disposed in an intermediate portion of the buffer portion 4252 or an adjacent region of the intermediate portion. The second recess 4256 has a cross section similar to the first recess 4251.

Referring to FIG. 7 and FIG. 8 simultaneously, when the UV curable glue 140 is applied to the spacer 125 of the first embodiment of the present invention by using the dispensing head 130, the dispensing head 130 is located above the first recess 1251. The dispensing head 130 can be moved one turn around the first groove 1251 or the dispensing head 130 can be moved without the spacer 125 moving one turn, thereby uniformly coating the UV curable glue 140 The plane on which the first groove 1251 is located. If the dispensing head 130 is slightly offset, the applied UV curable glue 140 will also accumulate in the first groove 1251, which does not affect the accuracy of the dispensing; When the curing glue 140 is too much, the UV curable glue 140 will overflow to both sides of the first groove 1251, and the buffer portion 1255 will slow down and block the UV curable glue 140 from flowing into the optical effective diameter of the lens module 100 to affect the image. effect. Since the dispensing head 130 is located above the first recess 1251 and the first recess 1251 has an opening, the change in the thickness of the spacer 125 does not cause a "needle strike" phenomenon, that is, the dispensing head 130 and the spacer 125 Collision. If a similar structure of the spacer 425 is used, the buffer portions 4255 and 4252 having the buffer portion 4255 and 4252 can better accommodate the overflowed UV curable glue 140.

In summary, the present invention complies with the requirements of the invention patent and submits a patent application according to law. The above description is only the preferred embodiment of the present invention, and equivalent modifications or variations made by those skilled in the art of the present invention should be included in the following claims.

100‧‧‧ lens module

110‧‧‧ first lens barrel

112‧‧‧Image Sensor

122‧‧‧ lenses

124‧‧‧ aperture film

114‧‧‧Transparent board

1257, 4257‧‧‧ second surface

140‧‧‧UV curable glue

1253‧‧‧First opening

2256‧‧‧Block block

4254‧‧‧Flange

120‧‧‧second lens barrel

121‧‧‧stepped through hole

123‧‧‧Filter

130‧‧‧ dispensing head

1256‧‧‧ first surface

1258‧‧‧ side

1252‧‧‧stepped light hole

1254‧‧‧ second opening

3256, 4256‧‧‧ second groove

4258‧‧‧ side

125,225,325,425‧‧‧ spacer gasket

1251, 2251, 3251, 4251‧‧‧ first groove

1255, 2255, 3255, 4255, 4252‧‧‧ buffer

1 is a schematic cross-sectional view of a lens module according to an embodiment of the present invention.

2 is a perspective view of the first embodiment of the spacer of the lens module shown in FIG. 1.

Figure 3 is a schematic cross-sectional view of the spacer shown in Figure 2.

4 is a schematic cross-sectional view showing a second embodiment of a spacer of a lens module according to an embodiment of the present invention.

FIG. 5 is a schematic cross-sectional view showing a third embodiment of a spacer of a lens module according to an embodiment of the present invention.

6 is a cross-sectional view showing a fourth embodiment of a spacer of a lens module according to an embodiment of the present invention.

FIG. 7 is a schematic view showing a state in which a dispensing process is performed on a spacer of a first embodiment of a lens module according to an embodiment of the present invention.

Figure 8 is a schematic cross-sectional view of the spacer shown in Figure 7 after dispensing.

100‧‧‧ lens module

110‧‧‧ first lens barrel

120‧‧‧second lens barrel

121‧‧‧stepped through hole

123‧‧‧Filter

114‧‧‧Transparent board

1251‧‧‧first groove

112‧‧‧Image Sensor

122‧‧‧ lenses

124‧‧‧ aperture film

1255‧‧‧ buffer

125‧‧‧ spacer gasket

Claims (9)

A lens module includes a lens barrel, at least one lens, a spacer and a filter, wherein the lens, the spacer, and the filter are sequentially received in the lens barrel, and the spacer is disposed on the lens The improvement between the filter and the filter is that the spacer comprises a first surface, a second surface opposite to the first surface, the first surface is bonded to the filter, and the first a first groove is disposed on the surface, and the stepped opening defines a stepped light passing hole, wherein the stepped light passing hole comprises a first opening and a second opening, wherein the first opening is located on the first surface, the second The opening is located at the second surface and communicates with the first opening. The first opening is larger than the second opening, and the stepped surface of the stepped light passing hole defines a first buffer portion. The lens module of claim 1, wherein the first groove has a V-shaped cross section. The lens module of claim 1, wherein the first groove has a cross section of a ladder shape. The lens module of claim 1, wherein the first groove has a circular arc shape in cross section. The lens module of claim 1, wherein the first groove has a depth of 0.1 mm to 0.5 mm. The lens module of claim 1, wherein the spacer comprises a side disposed between the first surface and the second surface, and a side of the spacer is disposed adjacent to an end of the second surface A flange, the surface of which the flange intersects the side of the spacer defines a second buffer. The lens module of claim 1 or 6, wherein the first buffer portion is provided with a blocking block. The lens module of claim 1, wherein the first buffer portion is provided with a second recess. The lens module of claim 8, wherein the second groove has a triangular, zigzag or circular cross section.