TWI818830B - Lens with light-shading structure and lens module - Google Patents

Abstract

A lens with a light-shielding structure includes: a lens body defining a central axis, and including an optical zone, a non-optical zone and an annular groove, wherein the optical zone surrounds the central axis, the non-optical zone surrounds the optical zone, the annular groove is arranged on the non-optical area, and the annular groove surrounds and is adjacent to the optical zone; and a light-shielding layer is arranged on the non-optical area and is located in the annular groove; wherein the annular groove includes a first annular surface and a second annular surface, the first annular surface is farther away from the central axis than the second annular surface, the second annular surface is parallel to the central axis, and the direction of the sectional opening of the annular groove is away from the central axis.

Description

Lenses and lens modules with light-shielding structures

The present invention relates to a lens and a lens module, and in particular, to a lens and a lens module with a light-shielding structure.

A conventional lens module includes a lens barrel and a plurality of lenses. These lenses are arranged coaxially on the lens barrel in order to achieve imaging purposes through different light gathering and astigmatism effects. In order to prevent stray light from interfering with imaging in conventional lens modules, one of the light-shielding mechanisms of the lens is to use a light-shielding sheet as a light-shielding layer. For example, the light-shielding sheet is sandwiched between the non-optical areas of each lens to absorb stray light and improve focus. Light effects to improve imaging.

Another method of the light-shielding mechanism of the lens is an ink layer, for example, ink is applied between the non-optical areas of each lens to absorb stray light, enhance the light-gathering effect, and improve imaging. However, in order to prevent ink spillage, an annular protruding structure is currently provided at the edge of the ink coating layer. However, if it is used on the lens structure of a lens module with a visible appearance, bright circles will be caused by reflection.

Therefore, there is a need to provide a lens and lens module with a light-shielding structure that can solve the aforementioned problems.

One object of the present invention is to provide a lens with a light-shielding structure. The annular groove of the lens body can improve the problem of bright circles in the appearance of lens modules in the prior art.

According to the above purpose, the present invention provides a lens with a light-shielding structure, including: a lens body defining a central axis, and including an optical zone, a non-optical zone and an annular groove, wherein the optical zone surrounds the center axis, the non-optical area surrounds the optical area, the annular groove is disposed in the non-optical area, and the annular groove surrounds and is adjacent to the optical area; and a light-shielding layer is disposed on the non-optical area and located on the annular in a shaped groove; wherein the annular groove includes a first annular surface and a second annular surface, the first annular surface is farther from the central axis than the second annular surface, and the second annular surface is parallel to the the central axis, and the direction of the cross-sectional opening of the annular groove is away from the central axis.

The present invention further provides a lens module, including: a lens barrel; and a plurality of lenses, at least one of the lenses is the lens with a light-shielding structure, and the lenses are arranged in the lens barrel.

According to the lens with a light-shielding structure of the present invention, the annular groove of the lens body not only has the function of preventing ink spillage, but also can improve the problem of bright circles in the appearance of the lens module of the prior art.

1: Lens module

10: Lens barrel

11:First lens

12:Second lens

13:Third lens

14:Fourth lens

15: Spacer ring

2: Lenses

2’: Lens

2”: Lens

21: Lens body

21’: Lens body

21”: Lens body

211: Annular groove

211’: Annular groove

211”: Annular groove

212: Image side surface

213:Object side surface

2111:First annular surface

2112:Second annular surface

22:Light shielding layer

22a:shading area

A1: included angle

CA: central axis

C1: Optical area

C2: Non-optical area

D1: direction

L1: axial thickness

L2: Axial thickness

L3: Radial length

L4: Radial length

R1: first round

R2: Second round

R3: Third round

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

FIG. 2 is an assembled cross-sectional view of a lens module according to an embodiment of the present invention.

Figure 3 is a cross-sectional view of a lens with a light shielding structure according to the first embodiment of the present invention.

4 is a partial cross-sectional view of a lens with a light-shielding structure according to the first embodiment of the present invention, which does not include a light-shielding layer.

5a and 5b are schematic diagrams illustrating the comparison of the simulation results of the appearance of the lens module of the prior art and the present invention.

6 is an enlarged cross-sectional view of a lens with a light-shielding structure according to the second embodiment of the present invention, which does not include a light-shielding layer.

FIG. 7 is a cross-sectional view of a lens with a light-shielding structure according to the third embodiment of the present invention.

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

FIG. 1 is an exploded perspective view of a lens module according to an embodiment of the present invention. FIG. 2 is an assembled cross-sectional view of a lens module according to an embodiment of the present invention. Please refer to Figures 1 and 2. The lens module 1 includes: a lens barrel 10 and a plurality of lenses (such as a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14), and these lenses Set inside the lens barrel. The first lens 11 to the fourth lens 14 can be made of plastic or glass materials. The lens barrel 10 is an integrated lens barrel (Barrel), and the lens barrel 10 can be made of plastic material. The interior of the lens barrel 10 can accommodate the first lens 11 to the fourth lens 14 and the spacer ring 15 or other optical components. The optical element may include a filter (such as an infrared filter, an infrared bandpass filter or other light band filters, etc.) or a light-shielding element (such as an aperture diaphragm or a diaphragm used to correct edge light).

Figure 3 is a cross-sectional view of a lens with a light shielding structure according to the first embodiment of the present invention. Please refer to FIG. 3 and FIG. 2 . In the first embodiment, the lens 2 with a light-shielding structure is the second lens 12 of the lens module 1 . This is only used as an example and is not intended to limit the present invention. The lens 2 includes: one lens copy body 21 and a light-shielding layer 22. The lens body 21 defines a central axis CA and includes an optical zone C1, a non-optical zone C2 and an annular groove 211. The optical area C1 surrounds the central axis CA, the non-optical area C2 surrounds the optical area C1, the annular groove 211 is disposed in the non-optical area C2, and the annular groove 211 surrounds and is adjacent to the optical area C1. The light shielding layer 22 is disposed on the non-optical area C2 and located in the annular groove 211 . The light-shielding layer 22 can be an ink coating layer, such as black resin and glue. Furthermore, the light-shielding layer 22 defines a light-shielding area 22a, which is located on the non-optical area C2 to absorb stray light, enhance the light-gathering effect, and improve imaging.

4 is a partial cross-sectional view of a lens with a light-shielding structure according to the first embodiment of the present invention, wherein the lens does not contain a light-shielding layer. Please refer to Figure 4. The annular groove 211 includes a first annular surface 2111 and a second annular surface 2112. The first annular surface 2111 is farther from the central axis CA than the second annular surface 2112. The annular surface 2112 is parallel to the central axis CA, and the annular groove 211 is far away from the central axis CA in the direction D1 of the cross-sectional opening in the radial direction. Please refer to FIG. 3 again. In the first embodiment, the lens body 21 further includes an opposite image-side surface 212 and an object-side surface 213. The annular groove 211 can be disposed on the image-side surface 212. The cross-sectional opening design formed by the first annular surface 2111 and the second annular surface 2112 of the annular groove 211 can prevent stray light in the lens module from being vertically reflected, thereby avoiding the problem of bright circles in the appearance of the lens module. .

Please refer to Figure 4 again. The angle between the second annular surface 2112 and the first annular surface 2111 is A1, and satisfies the following conditions: 45°≦A1≦85°. The annular groove 211 further includes a first rounded corner R1. The first rounded corner R1 is disposed on an outer edge of the first annular surface 2111. The first rounded corner R1 has an angle parallel to the central axis. The axial thickness of CA is L1 millimeters (mm), the second annular surface 2112 is parallel to the central axis, the axial thickness of CA is L2 millimeters (mm), and satisfies the following conditions: L1<L2, L1>0, And 0.030≦L2≦0.100, so that the annular groove 211 of the present invention has better protection against Ink spill function. The light shielding area 22a has a radial length perpendicular to the central axis CA of L4 millimeters (mm), the annular groove 211 has a radial length perpendicular to the central axis CA of L3 millimeters (mm), and meets the following conditions : 0.025≦L3/L4≦0.087, and 0.030≦L3≦0.100, so that the annular groove 211 of the present invention has a suitable function of preventing ink spillage. The annular groove 211 further includes a second rounded corner R2, and the second rounded corner R2 is provided on an outer edge of the second annular surface 2112. The design of the first rounded corner R1 and the second rounded corner R2 can facilitate the easy demoulding of the lens after injection molding.

5a and 5b are schematic diagrams illustrating the comparison of the simulation results of the appearance of the lens module of the prior art and the present invention. Please refer to Figure 5a. The annular protruding structure surrounding the ink coating layer in the prior art will cause a full circle of bright circles on the appearance of the lens module (as indicated by the arrow). Please refer to Figure 5b. The annular groove structure surrounding the light shielding layer of the present invention does not cause a full circle of bright circles in the appearance of the lens module. Therefore, according to the lens with a light-shielding structure of the present invention, the annular groove of the lens body not only has the function of preventing ink spillage, but also can improve the problem of bright circles in the appearance of the lens module of the prior art.

6 is an enlarged cross-sectional view of a lens with a light-shielding structure according to the second embodiment of the present invention, wherein the lens does not contain a light-shielding layer. Please refer to Figure 6. In the second embodiment, the lens 2' with a light-shielding structure includes a lens body 21', the lens body 21' includes an annular groove 211', and the annular groove 211' further includes A third rounded corner R3 is provided at the connection between the first annular surface 2111 and the second annular surface 2112. The design of the third rounded corner R3 can also prevent stray light in the lens module from being vertically reflected, thereby avoiding the problem of bright circles in the appearance of the lens module.

FIG. 7 is a cross-sectional view of a lens with a light-shielding structure according to the third embodiment of the present invention. Please refer to Figure 7. The lens 2" includes: a lens body 21" and a light-shielding layer 22". The lens body 21" includes an annular groove 211". The light-shielding layer 22" is disposed on the non-optical area, and located in the annular groove 211. The light-shielding layer 22" can be an ink-coated layer, such as black resin and glue. Furthermore, the light-shielding layer 22" A light-shielding area is defined, which is located on the non-optical area C2 to absorb stray light, enhance the light-gathering effect, and improve imaging. In the third embodiment, the lens body 21 ″ further includes opposite image-side surfaces 212 and object-side surfaces 213 , and the annular groove 211 ″ is disposed on the object-side surface 213 . The annular groove 211" not only has the function of preventing ink spillage, but is also a light trap design that can absorb stray light in the lens module.

To sum up, the above descriptions only describe the preferred implementation modes or examples of the technical means used to solve the problems of the present invention, and are not intended to limit the scope of the patent implementation of the present invention. That is to say, all changes and modifications that are consistent with the literal meaning of the patent application scope of the present invention, or are made in accordance with the patent scope of the present invention, are covered by the patent scope of the present invention.

2: Lenses

21: Lens body

211: Annular groove

212: Image side surface

213:Object side surface

2111:First annular surface

2112:Second annular surface

22:Light shielding layer

CA: central axis

C1: Optical area

C2: Non-optical area

D1: direction

Claims (9)

A lens with a light-shielding structure, including: a lens body, defining a central axis, and including an optical zone, a non-optical zone and an annular groove, wherein the optical zone surrounds the central axis, and the non-optical zone surrounds the optical zone area, the annular groove is disposed in the non-optical area, and the annular groove surrounds and is adjacent to the optical area; and a light-shielding layer is disposed on the non-optical area and is located in the annular groove; wherein the annular groove The shaped groove includes a first annular surface and a second annular surface, the first annular surface is farther from the central axis than the second annular surface, the second annular surface is parallel to the central axis, and the annular concave surface The direction of the cross-sectional opening of the groove is away from the central axis; and the annular groove further includes a first rounded corner R1, the first rounded corner is provided on an outer edge of the first annular surface, the first rounded corner R1 The fillet has an axial thickness parallel to the central axis of L1 millimeters (mm), the second annular surface has an axial thickness parallel to the central axis L2 millimeters (mm), and meets the following conditions: L1 <L2, and L1>0. The lens with a light-shielding structure as described in claim 1, wherein the angle between the second annular surface and the first annular surface is A1 and satisfies the following conditions: 45°≦A1≦85°. The lens with a light-shielding structure as described in claim 1, wherein the second annular surface has an axial thickness parallel to the central axis of L2 millimeters (mm) and satisfies the following conditions: 0.030≦L2≦0.100. The lens with a light-shielding structure as described in claim 1, wherein the light-shielding layer defines a light-shielding area, the light-shielding area is located on the non-optical area, and the light-shielding area has a radial length perpendicular to the central axis of L4 millimeters (mm) , the annular groove has a radial length perpendicular to the central axis of L3 millimeters (mm), and meets the following conditions: 0.025≦L3/L4≦0.087. The lens with a light-shielding structure as described in claim 4, wherein the annular groove has a radial length perpendicular to the central axis of L3 millimeters (mm) and satisfies the following conditions: 0.030≦L3≦0.100. The lens with a light-shielding structure as claimed in claim 1, wherein the annular groove further includes a second rounded corner R2, and the second rounded corner is provided on an outer edge of the second annular surface. The lens with a light-shielding structure as claimed in claim 6, wherein the annular groove further includes a third rounded corner R3, and the third rounded corner is provided on the first annular surface and the second annular surface. The connection point. The lens with a light-shielding structure as claimed in claim 1, wherein the lens body further includes an opposite image-side surface and an object-side surface, and the annular groove is disposed on at least one of the image-side surface and the object-side surface. Those who come up. A lens module, including: a lens barrel; and a plurality of lenses, at least one of the lenses is the lens with a light-shielding structure described in any one of claims 1 to 8, and the lenses are arranged on the lens inside the cylinder.