TWI787064B - Lens module - Google Patents

Abstract

A lens module includes: a lens barrel which defines a central axis and has an inner space; an optical lens assembly disposed in the inner space; and an optical filter also arranged in the inner space, wherein the optical lens assembly and the optical filter are disposed in order from the object side to the image side; wherein a glue accommodating space is defined between the lens barrel, the optical lens assembly and the filter, and the glue accommodating space includes a first glue groove and a second glue groove; the first glue groove is located between the optical filter, an inner wall of the lens barrel and the optical lens assembly, and is closer to the central axis of the lens barrel; and the second glue groove is located between the optical filter and the inner wall of the lens barrel, and is far away from the central axis of the lens barrel.

Description

Lens module

The present invention relates to a lens module, and in particular to a lens module. The groove design of the first glue groove and the second glue groove can increase the distance between the lens barrel and the filter. And the adhesive strength between the optical lens group and the optical filter.

When assembling the lens module, the optical element is generally put into the lens barrel first, and the optical element is pre-fixed in the lens barrel by using the interference between the optical element and the inner wall of the lens barrel, and then the optical element and the inner wall of the lens barrel Glue is dispensed in between to fix the optical element in the lens barrel. At present, there are manual dispensing and automatic dispensing methods. If the needle is not careful or does not control the amount of glue when dispensing, or the parameters of the automatic dispensing machine are abnormal, the glue will flow to the effective optical area of the optical lens, making the lens mold The production yield of the group drops.

Especially when assembling the optical filter of the lens module, it is easy to overflow the glue when dispensing the filter, which will cause the appearance of the lens to be poor, and it takes a long time to deal with the appearance of the dispensing glue. If the amount of glue is reduced in order to improve the appearance of dispensing, the dispensing strength of the filter will be insufficient, and the filter will not be able to be fully sealed with glue, resulting in the risk of water ingress.

Therefore, there is a need to provide a lens module capable of solving the aforementioned problems.

An object of the present invention is to provide a lens module, the groove design of the first glue groove and the second glue groove can increase the distance between the lens barrel and the filter and between the optical lens group and the filter. Adhesion strength between light sheets.

According to the above-mentioned purpose, the present invention provides a lens module, comprising: a lens barrel, which defines a central axis, and has an internal space; an optical lens group, arranged in the internal space; and a filter, also Set in the internal space, wherein the optical lens group and the optical filter are arranged in sequence from the object side to the image side; wherein a glue accommodating space is defined between the lens barrel, the optical lens group and the optical filter , and the glue containing space includes a first glue groove and a second glue groove; the first glue groove is located between the filter, the inner wall of the lens barrel and the optical lens group, and is relatively close to the central axis of the lens barrel; and the second glue groove is located between the optical filter and the inner wall of the lens barrel, and farther away from the central axis of the lens barrel.

When performing the fixing step of the optical filter, the excess glue will flow from the first glue groove through the glue channel to the direction of the second glue groove until the image on the inner wall of the lens barrel is covered. side surface. Because the groove design of the first glue groove and the second glue groove can increase the adhesive contact area of the glue, and then increase the distance between the lens barrel and the filter and between the optical lens group and the filter. The adhesion between (that is to say, increase the adhesion strength).

1: Lens module

10: Glue

11: Lens barrel

110: central axis

111: inner wall

1111: image side surface

112: Internal space

12: Optical lens group

121: Optical lens

1210: non-optical zone

1211: image side surface

1212: stepped section

13: Optical filter

13': filter

14:Accommodating space for glue

141: The first glue groove

1411:L-like profile

1412: T-shaped profile

142: Second glue groove

1421: overflow glue tank

1421': overflow glue tank

143: glue channel

A: radial width value

B: radial width value

C: radial width value

D: axial depth value

E: axial depth value

F: radial width value

G: axial depth value

H1: Maximum radial width value

H2: Maximum radial width value

IS: image side

OS: object side

1 to 3 are schematic cross-sectional views of an assembly method of a lens module according to an embodiment of the present invention.

FIG. 4 is a partially enlarged schematic cross-sectional view of a lens module according to an embodiment of the present invention.

FIG. 5 is a schematic plan view of a lens module according to an embodiment of the present invention.

FIG. 6 is an exploded perspective view of a lens module according to an embodiment of the present invention.

FIG. 7 is a schematic plan view of a lens module according to another embodiment of the present invention.

8 is a partially enlarged schematic cross-sectional view of the lens module according to the first embodiment of the present invention, without glue.

FIG. 9 is a partially enlarged schematic cross-sectional view of the lens module according to the second embodiment of the present invention, without glue.

In order to make the above objects, features and features of the present invention more comprehensible, the relevant embodiments of the present invention are described in detail as follows with reference to the drawings.

1 to 3 are schematic cross-sectional views of an assembly method of a lens module according to an embodiment of the present invention. Please refer to Fig. 1, carry out the pre-fixing step of optical lens group: this optical lens group 12 is packed in the internal space 112 of lens barrel 11, utilize the mutual interference between this optical lens group 12 and this lens barrel 11 inner wall to make the The optical lens group 12 is pre-fixed in the lens barrel 11 . Please refer to FIG. 2 , and then carry out the glue dispensing step: use manual glue dispensing or automatic glue dispensing, and glue 10 between the last lens of the optical lens group 12 and the inner wall of the lens barrel 11 . Please refer to FIG. 3 , and finally carry out the fixing step of the optical filter 13 : stick the optical filter 13 in the lens barrel 11 by the glue 10 , so as to complete the assembly of the lens module 1 .

FIG. 4 is a partially enlarged schematic cross-sectional view of a lens module according to an embodiment of the present invention. Please refer to FIG. 4 and FIG. 3 , the lens module 1 includes a lens barrel 11 , an optical lens group 12 and a filter 13 . The lens barrel 11 defines a central axis 110 (ie, the optical axis) and has an inner space 112 . The optical lens group 12 is disposed in the inner space 112 . The optical lens group 12 may include a plurality of lenses, and may be made of plastic or glass. The lens barrel 11 can be a one-piece lens barrel (Barrel), and can be made of plastic material. The inner space 112 of the lens barrel 11 accommodates the lenses or other optical elements. The optical element may include a spacer ring or a light-shielding element (such as an aperture stop or a stop for correcting peripheral rays) and the like. The filter 13 is also set on the In the internal space 112, the optical lens group 12 and the filter 13 are arranged in sequence from the object side OS to the image side IS. The optical filter 13 can be an optical element such as an infrared filter, an infrared bandpass filter or other optical band filters.

A glue accommodating space 14 is defined between the lens barrel 11 , the optical lens group 12 and the filter 13 for accommodating the glue 10 , and the glue accommodating space 14 includes a first glue groove 141 and a second glue groove 142 . The first glue groove 141 is located between the filter 13 , the inner wall 111 of the lens barrel 11 and the optical lens group 12 , and is closer to the central axis 110 of the lens barrel 11 . For example, the first glue groove 141 can be used as a main glue dispensing groove. The second glue groove 142 is located between the filter 13 and the inner wall 111 of the lens barrel 11 , and is farther away from the central axis 110 of the lens barrel 11 . For example, the second glue groove 142 is disposed on the image-side surface 1111 of the inner wall 111 of the lens barrel 11 . The accommodating space 14 further includes a glue channel 143, which is located between the filter 13 and the image side surface 1111 of the inner wall 111 of the lens barrel 11, and is used to communicate with the first glue groove 141 and the second glue groove. Glue groove 142. When carrying out the fixing step of the optical filter 13, the excess glue 10 will flow from the first glue groove 141 through the glue channel 143 to the direction of the second glue groove 142 until the mirror is covered. The image-side surface 1111 of the inner wall 111 of the barrel 11 . Because the groove design of the first glue groove 141 and the second glue groove 142 can increase the adhesive contact area of the glue 10, and then increase the distance between the lens barrel 11 and the filter 13 and the optical lens group 12. The adhesive force between the optical filter 13 (that is, increase the adhesive strength).

In this embodiment, the optical filter 13 is in contact with the optical lens group 12 . For example, the optical lens group includes an optical lens 121, which contacts the filter 13, and the non-optical area 1210 of the image-side surface 1211 of the optical lens 121 has a stepped section 1212, so that the first glue groove can be formed 141 stepped grooves.

FIG. 5 is a schematic plan view of a lens module according to an embodiment of the present invention. FIG. 6 is an exploded perspective view of a lens module according to an embodiment of the present invention. Please refer to FIG. 5 and FIG. 6 , in this embodiment, the filter 13 can be a square filter, for example, the size of the filter can be 3.05*3.05*0.21 mm. The first glue groove 141 surrounds the central axis 110 of the lens barrel 11 . The top view of the first glue groove 141 may be a complete ring. The second glue groove 142 includes a plurality of overflowing glue grooves 1421, for example four overflowing glue grooves 1421, these overflowing glue grooves 1421 are discontinuously arranged on the image side surface 1111 of the inner wall 111 of the lens barrel 11, and surround the The central axis 110 of the lens barrel 11 . Each glue overflow groove 1421 may be partially ring-shaped in a top view. According to the lens module of the present invention, the reserved overflow groove can increase the appearance yield of dispensing, and solve the problem of insufficient glue dispensing strength and inability to seal the entire circumference of the filter to improve the appearance of dispensing and reduce the amount of glue. Water ingress risk. Furthermore, these overflow glue grooves can be used as secondary glue dispensing grooves to increase the glue dispensing strength of the optical filter.

FIG. 7 is a schematic plan view of a lens module according to another embodiment of the present invention. In another embodiment, the filter 13' can be a circular filter. The second glue groove 142 includes a single glue overflow groove 1421', which is arranged on the image-side surface 1111 of the inner wall 111 of the lens barrel 11 and surrounds the central axis 110 of the lens barrel 11. The top view of the overflow glue groove 1421' is a complete ring. Similarly, according to the lens module of the present invention, the reserved glue groove can increase the appearance yield of dispensing, and solve the problem of insufficient glue dispensing strength and inability to fully circle the filter caused by reducing the amount of glue to improve the appearance of dispensing. There is a risk of water ingress in the sealant.

8 is a partially enlarged schematic cross-sectional view of the lens module according to the first embodiment of the present invention, without glue. According to the lens module 1 of the first embodiment of the present invention, relevant values are shown in Table 1:

Please refer to FIG. 8 , the first glue groove 141 has a cross section 1411 similar to an L shape. The axial depth of the first glue groove 141 is set to a value D, the maximum radial width of the first glue groove 141 is set to a value H1, and the numerical ratio of H1/D is between 1.4˜2.3. In addition, the radial width of the image-side surface 111 of the inner wall 111 of the lens barrel 11 is set to a numerical value A (at this time, the radial width numerical value A may further include the portion of the slope, or the radial width numerical value A may only be the same as surface width perpendicular to the central axis), the radial width of the second glue groove 142 is set to a value B, and the value ratio of B/A is between 0.15-0.4. If the numerical ratio of B/A is too small, the glue overflow effect will not be good; if the numerical ratio of B/A is too large, the glue overflow tank will not be filled, so that the filter is not fixed well, and air bubbles may occur. The axial depth of the first glue groove 141 is set to a value D, the axial depth of the second glue groove 142 is set to a value E, and the numerical ratio of E/D is between 0.08˜0.45. If the numerical ratio of E/D is too small, it will be difficult to release the lens barrel during manufacturing; if the numerical ratio of E/D is too large, the amount of glue used will increase. The axial depth of the first glue groove 141 is set to a value D, the axial depth of the glue channel 143 is set to a value G, and the numerical ratio of G/D is between 0.1˜0.3. If the numerical ratio of G/D is too small, the speed of glue overflow will be slow, and may flow back to the optical area of the optical lens group; if the numerical ratio of G/D is too large, the amount of glue used will increase.

FIG. 9 is a partially enlarged schematic cross-sectional view of the lens module according to the second embodiment of the present invention, without glue. According to the lens module 1 of the second embodiment of the present invention, relevant values are shown in Table 2:

Please refer to FIG. 9 , the first glue groove 141 has a T-like cross section 1412 . The axial depth of the first glue groove 141 is set to a value D, the maximum radial width of the first glue groove 141 is set to a value H2, and the numerical ratio of H2/D is between 2.2-3.3. In addition, the radial width of the image-side surface 1111 of the inner wall 111 of the lens barrel 11 is set to a value A (at this time, the radial width value A may further include the portion of the slope, or the radial width value A may only be the same as surface width perpendicular to the central axis), the radial width of the second glue groove 142 is set to a value B, and the value ratio of B/A is between 0.15-0.4. If the numerical ratio of B/A is too small, the glue overflow effect will not be good; if the numerical ratio of B/A is too large, the glue overflow tank will not be filled, so that the filter is not fixed well, and air bubbles may occur. The axial depth of the first glue groove 141 is set to a value D, the axial depth of the second glue groove 142 is set to a value E, and the numerical ratio of E/D is between 0.08˜0.45. If the numerical ratio of E/D is too small, it will be difficult to release the lens barrel during manufacturing; if the numerical ratio of E/D is too large, the amount of glue used will increase. The axial depth of the first glue groove 141 is set to a value D, the axial depth of the glue channel 143 is set to a value G, and the numerical ratio of G/D is between 0.1-0.3. If the numerical ratio of G/D is too small, the glue overflowing speed will be slow, It may flow back to the optical area of the optical lens group; if the numerical ratio of G/D is too large, the amount of glue used will increase.

According to the lens module of the embodiment of the present invention, regardless of whether the first glue groove has a cross-section similar to L-shape or T-shape, the original adhesive range and adhesive strength can be maintained, but the amount of glue used and the cycle time of dispensing can be greatly reduced. (cycle time), and limit the direction of glue flow. Furthermore, if glues with different mechanical strengths are used, the sealing requirements can be taken into account.

To sum up, the above is only a description of the preferred implementation mode or example of the technical means adopted by the present invention to solve the problems, and it is not used to limit the scope of the patent implementation of the present invention. That is, all equivalent changes and modifications that are consistent with the scope of the patent application of the present invention, or made according to the scope of the patent of the present invention, are covered by the scope of the patent of the present invention.

1: Lens module

10: Glue

11: Lens barrel

110: central axis

111: inner wall

112: Internal space

12: Optical lens group

13: Optical filter

14:Accommodating space for glue

IS: image side

OS: object side

Claims (15)

A lens module, comprising: a lens barrel, which defines a central axis, and has an inner space; an optical lens group, arranged in the inner space; and a filter, also arranged in the inner space, wherein The optical lens group and the optical filter are arranged sequentially from the object side to the image side; wherein a glue accommodating space is defined between the lens barrel, the optical lens group and the optical filter, and the glue accommodating space includes A first glue groove and a second glue groove connected to each other; the first glue groove is located between the filter, the inner wall of the lens barrel and the optical lens group, and is closer to the lens barrel a central axis; and the second glue groove is located between the optical filter and the inner wall of the lens barrel, and is farther away from the central axis of the lens barrel. The lens module as described in item 1 of the scope of the patent application, wherein the second glue groove is arranged on the image-side surface of the inner wall of the lens barrel. The lens module as described in item 1 of the scope of the patent application, wherein the filter is square. The lens module as described in item 3 of the scope of the patent application, wherein the second glue groove includes a plurality of overflowing glue grooves, and these overflowing glue grooves are discontinuously arranged on the image side surface of the inner wall of the lens barrel, and surround the The central axis of the lens barrel. The lens module as described in item 4 of the scope of the patent application, wherein the top view of each overflow groove is partially ring-shaped. The lens module as described in Item 1 of the scope of the patent application, wherein the accommodating space further includes a glue channel, which is located between the filter and the image-side surface of the inner wall of the lens barrel, and is used to communicate with the first A glue groove and the second glue groove. The lens module as described in item 1 of the scope of the patent application, wherein the optical filter is in contact with the optical lens group. The lens module as described in item 7 of the scope of the patent application, wherein the optical lens group includes an optical lens, which contacts the filter, and the non-optical area of the image-side surface of the optical lens has a stepped cross-section. The lens module as described in item 6 of the scope of the patent application, wherein the first glue groove has a cross-section similar to an L shape. The lens module as described in item 9 of the scope of the patent application, wherein the axial depth of the first glue groove is set to a value D, the maximum radial width of the first glue groove is set to a value H1, and H1/D The numerical ratio is between 1.4 and 2.3. The lens module as described in item 6 of the scope of the patent application, wherein the first glue groove has a cross-section similar to a T shape. The lens module as described in item 11 of the scope of the patent application, wherein the axial depth of the first glue groove is set to a value D, the maximum radial width of the first glue groove is set to a value H2, and H2/D The numerical ratio is between 2.2 and 3.3. The lens module as described in item 9 or 11 of the scope of the patent application, wherein the radial width of the image-side surface of the inner wall of the lens barrel is set to a value A, and the radial width of the second glue groove is set to a value B , and the numerical ratio of B/A is between 0.15 and 0.4. The lens module as described in item 9 or 11 of the scope of the patent application, wherein the axial depth of the first glue groove is set to a value D, the axial depth of the second glue groove is set to a value E, and E/ The numerical ratio of D ranged from 0.08 to 0.45. The lens module as described in item 9 or 11 of the scope of the patent application, wherein the axial depth of the first glue groove is set to a value D, the axial depth of the glue channel is set to a value G, and the value of G/D The ratio is between 0.1~0.3.

Images