TWI795290B - Lens module - Google Patents

Abstract

A lens module includes: a lens barrel; and an optical lens assembly, which is disposed in the lens barrel, wherein the optical lens assembly includes a first lens, and the first lens is closest to the object side; wherein an image-side surface of the first end of the lens barrel includes a first ring portion and a second ring portion, and the first ring portion is closer to the image side than the second ring portion; the first ring portion and the second ring portion are both in contact with the first lens to form a first annular contact surface and a second annular contact surface respectively, and the first annular contact surface and the second annular contact surface both surround a central axis of the lens barrel; and a first air space is defined between the first ring portion, the second ring portion and the first lens; and the outer annular surface of the first lens is in contact with the lens barrel.

Description

Lens module

The present invention relates to a lens module, and in particular to a lens module in which multiple rings of the lens barrel are in close contact with the first lens of the optical lens group.

When the lens of the lens module has foreign matter or lint residue on the surface, it will affect the image quality, and the wiping method is easy to scratch the lens and the cleaning efficiency is low. Therefore, direct washing with water is the fastest and most effective cleaning method. If the lens module is directly washed and cleaned, its waterproof design becomes very important. Secondly, in an environment with heavy humidity, the waterproof and dustproof of the conventional lens module is also the design focus. In addition to preventing function failure, it can also prolong the service life, and the market demand for waterproof products is increasing, so the waterproof function is not possible. Or missing. At present, conventional lens modules generally utilize sealing rings (ie, waterproof rings) or sealants (ie, waterproof glue) for waterproofing. However, whether the sealing ring or the sealant is used, the assembly steps and assembly cost of the lens module will be increased.

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, in which a plurality of rings of the lens barrel are in close contact with the first lens of the optical lens group.

According to the above purpose, the present invention provides a lens module, including: a lens barrel, which has a central axis, a first end and a second end, the first end and the second end are respectively close to an object side and an image side; and an optical lens group disposed in the lens barrel, wherein the optical lens group includes a first lens, the first lens is closest to the object side; wherein an image side of the first end of the lens barrel The surface includes a first ring portion and a second ring portion, and the first ring portion is closer to the image side than the second ring portion; both the first ring portion and the second ring portion are in contact with the first lens A first annular contact surface and a second annular contact surface are respectively formed, and both the first annular contact surface and the second annular contact surface surround the central axis of the lens barrel; the first ring portion, the second annular contact surface A first air gap is defined between the ring portion and the first lens; and the outer ring surface of the first lens is in contact with the lens barrel.

The design of the tight contact between the first and second ring parts and the first lens of the present invention can prevent water or dust from entering along the path of the first annular contact surface, the first air gap and the second annular contact surface The lens barrel can indeed achieve the effect of waterproof and dustproof.

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.

FIG. 1 is an exploded cross-sectional schematic diagram of a lens module according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a lens module assembly according to an embodiment of the present invention. FIG. 3 is an enlarged schematic cross-sectional view of part A of the lens module according to the first embodiment of the present invention. Please refer to FIGS. 1-3 , the lens module 1 includes: a lens barrel 11 and an optical lens group 12 . The lens barrel 11 can be an integral lens barrel or a separate lens barrel (Barrel), and can be made of plastic material. The lens barrel 11 has a central axis 10 , a first end 111 and a second end 112 , and the first end 111 and the second end 112 are respectively close to the object side OS and the image side IS.

The optical lens group 12 is disposed in the accommodating space 110 of the lens barrel 11 . The optical lens group 12 sequentially includes a plurality of optical lenses from the object side OS to the image side IS, and can be made of plastic or glass materials. The accommodating space 110 of the lens barrel 11 also accommodates other optical components, for example, the optical components may include spacer rings, filters (such as infrared filters, infrared bandpass filters or other optical band filters, etc.) Or a shading element (such as an aperture diaphragm or a diaphragm for correcting marginal light), etc.

In the first embodiment, the optical lens group 12 includes a first lens 121 , and the first lens 121 is closest to the object side OS. The outer ring surface 1210 of the first lens 121 is in contact with the lens barrel 11 . The image side surface 1110 of the first end 111 of the lens barrel 11 includes a first ring portion 1111 and a second ring portion 1112 , and the first ring portion 1111 is closer to the image side IS than the second ring portion 1112 . Both the first ring portion 1111 and the second ring portion 1112 are in contact with the first lens 121 to form a first annular contact surface A1 and a second annular contact surface A2 respectively, and the first annular contact surface A1 And the second annular contact surface A2 surrounds the central axis 10 of the lens barrel 11 . The first and second ring portions 1111, 1112 are in close contact with the first lens 121 to form two barrier structures (ie, the first and second annular contact surfaces A1, A2), whereby the two barrier structures can achieve Waterproof and dustproof effect. Furthermore, a first air gap G1 is defined between the first ring portion 1111, the second ring portion 1112, and the first lens 121, so as to avoid stress concentration when assembling the lens module; and, the first The air gap G1 acts as a buffer against water or dust.

Accordingly, the design of the close contact between the first and second ring parts 1111, 1112 and the first lens 121 of the present invention has the function of preventing water or dust from moving along the first annular contact surface A1, the first air gap G1 and The path of the second annular contact surface A2 enters the lens barrel 11 , which can indeed achieve the effect of waterproof and dustproof.

The first lens 121 includes a first mirror area 1211 and a second mirror area 1212. The first mirror area 1211 is farther away from the image side IS than the second mirror area 1212. The first annular contact surface A1 is located on the second mirror area. Between a ring portion 1111 and the first mirror area 1211 , and the second annular contact surface A2 is located between the second ring portion 1112 and the second mirror area 1212 . Please refer to FIG. 3 again, in the first embodiment, the first ring portion 1111 can be closer to the central axis 10 of the lens barrel 11 than the second ring portion 1112 . Please refer to FIG. 4 , in the second embodiment, the second ring portion 1112 can be closer to the central axis 10 of the lens barrel 11 than the first ring portion 1111 . The first and second ring portions 1111, 1112 are in close contact with the first and second mirror regions 1211, 1212 respectively, forming first and second barrier structures (ie, the first and second annular contact surfaces A1, A2) , whereby the first and second barrier structures form a waterproof and dustproof effect.

5 is an enlarged schematic cross-sectional view of part A of the lens module according to the first embodiment of the present invention, which shows the radial length and the axial distance. The radial length refers to the length along the radial direction Y, and the axial distance refers to the distance along the axial direction X. For example, both the first annular contact surface A1 and the second annular contact surface A2 can be perpendicular to the central axis 10 of the lens barrel 11 . The radial length of the first annular contact surface A1 is D1, the total radial length of the first annular contact surface A1, the first air gap G1 and the second annular contact surface A2 is D2, and satisfies The following conditions: 0.1<D1/D2<0.5. The current preferred design is D1/D2=0.2, and the condition of D1/D2<0.1 or D1/D2>0.5 may cause poor contact between the lens barrel 11 and the first lens 121 . The axial distance between the first annular contact surface A1 and the second annular contact surface A2 is L, and the following conditions are met: 0.005mm≦L≦0.15mm, so that the first and second ring parts 1111, 1112 And the first and second mirror regions 1211, 1212 are not difficult to manufacture during the forming process, but the step design between the first and second annular contact surfaces A1, A2 can achieve a better waterproof and dustproof effect.

FIG. 6 is an enlarged cross-sectional schematic view of part C of the lens module according to the third embodiment of the present invention. Please refer to FIG. 1 , FIG. 2 and FIG. 6 , the lens module 1 includes: a lens barrel 11 and an optical lens group 12 . The lens barrel 11 has a central axis 10 , a first end 111 and a second end 112 , and the first end 111 and the second end 112 are respectively close to the object side OS and the image side IS. The optical lens group 12 is disposed in the accommodating space 110 of the lens barrel 11 . The optical lens group 12 includes a first lens 121 , and the first lens 121 is closest to the object side OS. The outer ring surface 1210 of the first lens 121 is in contact with the lens barrel 11 . The image side surface 1110 of the first end 111 of the lens barrel 11 includes a first ring portion 1111 and a second ring portion 1112 , and the first ring portion 1111 is closer to the image side IS than the second ring portion 1112 . Both the first ring portion 1111 and the second ring portion 1112 are in contact with the first lens 121 to form a first annular contact surface A1 and a second annular contact surface A2 respectively, and the first annular contact surface A1 And the second annular contact surface A2 surrounds the central axis 10 of the lens barrel 11 . The first and second ring portions 1111, 1112 are in close contact with the first lens 121 to form two barrier structures (ie, the first and second annular contact surfaces A1, A2), whereby the two barrier structures form Waterproof and dustproof effect. Furthermore, a first air gap G1 is defined between the first ring portion 1111, the second ring portion 1112, and the first lens 121, so as to avoid stress concentration when assembling the lens module; and, the first The air gap G1 acts as a buffer against water or dust.

Referring to FIG. 6 again, the image side surface 1110 of the first end 111 of the lens barrel 11 further includes a third ring portion 1113 , and the first ring portion 1111 is closer to the image side IS than the third ring portion 1113 . The third ring portion 1113 is in contact with the first lens 121 to form a third annular contact surface A3 , and the third annular contact surface A3 surrounds the central axis 10 of the lens barrel 11 . For example, the third annular contact surface A3 is perpendicular to the central axis 10 of the lens barrel 11 . The third ring portion 1113 is in close contact with the first lens 121 to form another barrier structure (ie, the third annular contact surface A3 ), whereby the barrier structure can increase the waterproof and dustproof effect. There is a second air gap G2 between the first ring part 1111, the third ring part 1113 and the first lens 121, so as to avoid stress concentration when assembling the lens module; and, the second air gap G2 also acts as a buffer against water or dust. The third ring portion 1113 is closer to the central axis 10 of the lens barrel 11 than the first ring portion 1111 , and the first ring portion 1111 is closer to the central axis 10 of the lens barrel 11 than the second ring portion 1112 .

Accordingly, the design of the third ring portion 1113, the first ring portion 1111, and the second ring portion 1112 of the present invention in close contact with the first lens 121 has the ability to prevent water or dust from moving along the third annular contact surface A3, The paths of the second air gap G2 , the first annular contact surface A1 , the first air gap G1 and the second annular contact surface A2 enter the lens barrel 11 , which can indeed achieve waterproof and dustproof effects.

The first lens 121 includes a first mirror area 1211 and a second mirror area 1212. The first mirror area 1211 is farther away from the image side IS than the second mirror area 1212. The first annular contact surface A1 is located on the second mirror area. Between a ring portion 1111 and the first mirror area 1211 , and the second annular contact surface A2 is located between the second ring portion 1112 and the second mirror area 1212 . The first and second ring portions 1111, 1112 are in close contact with the first and second mirror regions 1211, 1212 respectively, forming first and second barrier structures (ie, the first and second annular contact surfaces A1, A2) , so that the barrier structure forms a waterproof and dustproof effect. The first lens 121 further includes a third mirror area 1213, the first mirror area 1211 is farther away from the image side IS than the third mirror area 1213, and the third annular contact surface A3 is located between the third ring portion 1113 and the third ring portion 1113. Between the three mirror regions 1213 . The third ring portion 1113 is in close contact with the third mirror area 1213 to form a third barrier structure (ie, the third annular contact surface A3 ), whereby the third barrier structure can increase the waterproof and dustproof effect.

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: Central axis 11: Lens barrel 110:Accommodating space 111: first end 1110: image side surface 1111: First ring department 1112: the second ring 1113: The third ring 112: second end 12: Optical lens group 121: first lens 1210: outer annulus 1211: The first mirror area 1212: Second mirror area 1213: The third mirror area A: part A1: The first annular contact surface A2: Second annular contact surface A3: The third annular contact surface B: part C: part D1: radial length D2: radial length G1: first air gap G2: second air gap IS: image side L: axial distance OS: object side X: Axial Y: Radial

FIG. 1 is an exploded cross-sectional schematic diagram of a lens module according to an embodiment of the present invention. FIG. 2 is a schematic cross-sectional view of a lens module assembly according to an embodiment of the present invention. FIG. 3 is an enlarged schematic cross-sectional view of part A of the lens module according to the first embodiment of the present invention. FIG. 4 is an enlarged schematic cross-sectional view of part B of the lens module according to the second embodiment of the present invention. 5 is an enlarged schematic cross-sectional view of part A of the lens module according to the first embodiment of the present invention, which shows the radial length and the axial distance. FIG. 6 is an enlarged cross-sectional schematic view of part C of the lens module according to the third embodiment of the present invention.

11: Lens barrel

1111: First ring department

1112: the second ring

121: first lens

1210: outer annulus

1211: The first mirror area

1212: Second mirror area

A: part

A1: The first annular contact surface

A2: Second annular contact surface

G1: first air gap

Claims (11)

A lens module, comprising: A lens barrel, which has a central axis, a first end and a second end, the first end and the second end are respectively close to an object side and an image side; and An optical lens group is arranged in the lens barrel, wherein the optical lens group includes a first lens, and the first lens is closest to the object side; Wherein an image-side surface of the first end of the lens barrel includes a first ring portion and a second ring portion, and the first ring portion is closer to the image side than the second ring portion; Both the first ring portion and the second ring portion are in contact with the first lens to form a first annular contact surface and a second annular contact surface respectively, and the first annular contact surface and the second annular contact surface The surfaces all surround the central axis of the lens barrel; a first air space is defined between the first ring portion, the second ring portion, and the first lens; and The outer ring surface of the first lens is in contact with the lens barrel. The lens module as described in Claim 1, wherein the first lens includes a first mirror area and a second mirror area, the first mirror area is farther from the image side than the second mirror area, and the first annular The contact surface is located between the first ring portion and the first mirror area, and the second annular contact surface is located between the second ring portion and the second mirror area. The lens module according to claim 1, wherein the first annular contact surface and the second annular contact surface are both perpendicular to the central axis of the lens barrel. The lens module as described in claim 3, wherein the radial length of the first annular contact surface is D1, the sum of the first annular contact surface, the first air gap and the second annular contact surface The radial length is D2, and the following conditions are satisfied: 0.1<D1/D2<0.5. The lens module according to claim 3, wherein the axial distance between the first annular contact surface and the second annular contact surface is L, and satisfies the following condition: 0.005mm≦L≦0.15mm. The lens module according to claim 1, wherein the first ring portion is closer to the central axis of the lens barrel than the second ring portion. The lens module according to claim 1, wherein the second ring portion is closer to the central axis of the lens barrel than the first ring portion. The lens module as claimed in claim 1, wherein the image-side surface of the first end of the lens barrel further includes a third ring portion, and the first ring portion is closer to the image side than the third ring portion; The third ring portion is in contact with the first lens to form a third annular contact surface, and the third annular contact surface surrounds the central axis of the lens barrel; and There is a second air gap between the first ring part, the third ring part and the first lens. The lens module as described in claim 8, wherein the first lens further includes a third mirror area, the first mirror area is farther from the image side than the third mirror area, and the third annular contact surface is located on the third between the ring portion and the third mirror area. The lens module according to claim 8, wherein the third ring portion is closer to the central axis of the lens barrel than the first ring portion, and the first ring portion is closer to the central axis of the lens barrel than the second ring portion . The lens module according to claim 8, wherein the third annular contact surface is perpendicular to the central axis of the lens barrel.

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