KR20130028954A - Lens module - Google Patents

Abstract

PURPOSE: A lens module is provided to implement the performance of the stable lens module. CONSTITUTION: A lens module(100) comprises a first optic member(110), a second lens element(120), and a shading film(130). A plurality of lens member is laminated and welded to a light axial. The shading film is installed between the lens members and forms a hole controlling the amount of light which incidents to the lens member. The shading film comprises an air flow path extending to a vertical direction of the light axis from the hole. The air flow path is expanded as it goes from the hole to an edge of the shading film.

Description

A lens module {Lens module}

The present invention relates to a lens module, and more particularly, to a lens module that can effectively reduce the swelling pressure generated during the lens stacking process.

In general, a portable electronic device including a mobile phone is provided with a camera module for taking a picture. Early camera modules simply stayed to perform additional functions (eg, video calls) of portable electronic devices, so the structure was simple and the performance was very weak.

However, in recent years, as consumers' desire for such portable electronic devices increases, there is a need for a high performance and small size camera module having a high resolution.

Meanwhile, camera modules used in portable electronic devices have to be mass-produced and inexpensive, so they are manufactured on a wafer basis. Wafer-based lens module can be manufactured without a separate assembly process, unlike the lens module by the general injection molding, there is an advantage that the lens module is excellent in productivity and low production cost.

The wafer-based lens module is manufactured by vertically bonding a plurality of wafers, a spacer member, a light shielding film, etc., on which a lens is formed. Here, since these components are thin and fairly wide thin film forms, it is possible to generate swelling in the joint during the lamination process.

However, this squeezing pressure can put a considerable pressure on a thin member such as a wafer, and thus not only cause deformation of the lens shape to be manufactured, but also reduce the bonding precision between the stacked components (wafer, spacer, light shielding film, etc.).

JP 2010-185940 A

An object of the present invention is to provide a lens module having a structure that can effectively reduce the swelling pressure generated during the lamination process of the lens module.

Lens module according to an embodiment of the present invention for achieving the above object is a plurality of lens members are laminated and bonded along the optical axis direction; And a light shielding film disposed between the lens members and having a hole for adjusting an amount of light incident on the lens member, wherein the light shielding film may include an air passage extending from the hole in a vertical direction of the optical axis.

The vent of the lens module according to an exemplary embodiment may have a shape extending from the hole toward the edge of the light blocking film.

According to the present invention, it is possible to effectively remove or reduce the swelling pressure generated when stacking a plurality of lenses (or a wafer having a lens shape), it is possible to implement a stable lens module performance.

1 is an exploded perspective view of a lens module according to a first embodiment of the present invention;
2 is a perspective view of the lens module shown in FIG.
3 is an exploded perspective view of a lens module according to a second embodiment of the present invention;
4 is an exploded perspective view of a lens module according to a third embodiment of the present invention;
5 is a longitudinal cross-sectional view of the lens module illustrated in FIG. 4;
6 is an exploded perspective view of a lens module according to a fourth embodiment of the present invention;
FIG. 7 is a longitudinal cross-sectional view of the lens module illustrated in FIG. 6;
8A, 8B and 8C are views illustrating a method of manufacturing a lens module according to an embodiment of the present invention.
9 and 10 are plan views illustrating other shapes of the light blocking member illustrated in FIG. 8.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, terms that refer to the components of the present invention are named in consideration of the function of each component, it should not be understood as a meaning limiting the technical components of the present invention.

1 is an exploded perspective view of a lens module according to a first embodiment of the present invention, and FIG. 2 is a combined perspective view of the lens module shown in FIG. 1.

The lens module 100 according to the first embodiment may include a first lens member 110, a second lens member 120, and a light shielding film 130.

The first lens member 110 may include a first optical part 112 and a first junction part 114. The first optical unit 112 may form a lens surface in the first lens member 110. The first optical part 112 may be convex or concave. However, the shape of the first optical unit 112 may vary depending on the type and function of the lens module 100 to be manufactured. In addition, the shape of the first optical unit 112 may vary depending on the position where the first lens member 110 is installed in the lens module 100. For example, when the first lens member 110 is the lens member closest to the object side in the lens module 100, the first optical part 112 may have a convex shape. In contrast, when the first lens member 110 is the lens closest to the image sensor side in the lens module 100, the first optical part 112 may have a concave shape. However, the shape of the first lens member 110 may be contrary to the above-described example according to the number of lenses constituting the lens module 100. In addition, the first optical unit 112 may be spherical, aspherical, or planar as necessary. The first junction part 114 may be a portion that directly or indirectly contacts and bonds with another lens member or a component (eg, a light shielding film or a spacer) of another lens module. Therefore, the first junction part 114 may have a planar shape to be in close contact with these other members.

The second lens member 120 may include a second optical part 122 and a second junction part 124. The second optical unit 122 may form a lens surface in the second lens member 120. The second optical unit 122 may have the same or different shape as the first optical unit 112. However, the shape of the second optical unit 112 may vary depending on the type and function of the lens module 100 to be manufactured. In addition, the shape of the second optical unit 122 may vary depending on the position where the second lens member 120 is installed in the lens module 100. For example, when the second lens member 120 is the lens member closest to the object side in the lens module 100, the second optical unit 122 may have a convex shape. In contrast, when the second lens member 120 is the lens closest to the image sensor side in the lens module 100, the second optical unit 122 may have a concave shape. In addition, the second optical unit 122 may be spherical, aspherical, or planar as necessary. The second junction part 124 may be a portion which directly or indirectly contacts and bonds with another lens member or a component of another lens module (eg, a light shielding film or a spacer). Accordingly, the second junction part 124 may have a planar shape like the first junction part 114.

For reference, the first lens member 110 and the second lens member 120 may be made of a plastic material, it may be manufactured in the form of a lens array. However, the lens module 100 may be manufactured from glass or other materials according to the size and type of the mobile terminal to be installed, and may be manufactured in an individual form instead of a lens array form.

The light blocking film 130 may be disposed between the lens members 110 and 120 and may be made of a material that is relatively thinner than the lens members 110 and 120. For example, the light blocking film 130 may be made of a film material. More specifically, the light blocking film 130 may be made of an opaque film material through which light is not transmitted or a film material printed with opaque ink. In addition, the light shielding film 130 may be made of a material having anti-reflective properties in which light is not reflected. Such a light shielding film 130 may not only block the incident light included in the effective light (eg, the reflected light required for developing the subject) to the image sensor but also suppress the flare phenomenon caused by the light.

The light blocking film 130 may include a hole 132 and an air passage 134. Here, the hole 132 may serve as a path for the reflected light incident through the optical units 112 and 122. Specifically, the hole 132 may block the light so that only the effective light necessary for the reflected light incident on the optical units 112 and 122 is incident on the image sensor. Therefore, the radius R3 of the hole 132 may be smaller than the radius R1 of the first optical part 112 or the radius R2 of the first optical part 122. For example, when the first lens member 110 is located closer to the object side than the second lens member 120, the radius R3 of the hole 132 is the radius R1 of the first optical part 112. Can be less than In contrast, when the second lens member 120 is located closer to the object side than the first lens member 110, the radius R3 of the hole 132 is larger than the radius R2 of the second optical part 122. Can be small. The ventilation passage 134 may be formed to be long from the hole 132 to the edge of the light blocking film 130. The ventilation passage 134 formed as described above may form a passage through which air can communicate between the first lens member 110 and the second lens member 120, as shown in FIG. The swelling pressure generated when the joints 110 and 120 are joined can be reduced. Meanwhile, in FIG. 1, although the ventilation passage 134 is shown in a form in which a part of the light blocking film 130 is completely cut out, it may be formed in a groove shape having a predetermined depth as needed.

Next, another embodiment of the present invention will be described with reference to FIGS. 3 to 7. 3 is an exploded perspective view of the lens module according to the second embodiment of the present invention, FIG. 4 is an exploded perspective view of the lens module according to the third embodiment of the present invention, and FIG. 5 is a longitudinal cross-sectional view of the lens module shown in FIG. 4. 6 is an exploded perspective view of a lens module according to a fourth exemplary embodiment of the present invention, and FIG. 7 is a longitudinal cross-sectional view of the lens module illustrated in FIG. 6.

The lens module 100 according to the second embodiment may be distinguished from the first embodiment in the shape of the air passage 134.

In the second exemplary embodiment, the light blocking film 130 may include an air passage 134 that gradually expands or widens from the hole 132 to the edge of the light blocking film 130 as shown in FIG. 3. Since the vent 134 having such a shape can provide a relatively wider air passage than the first embodiment, it is possible to more effectively reduce the swelling pressure generated when the lens members 110 and 120 are bonded.

The lens module 100 according to the third embodiment may be distinguished from the above-described embodiment in that the groove 136 is formed in the light blocking film 130.

In general, the swelling pressure is generated over the entire area of the junction portions 114 and 124 of the lens members 110 and 120 facing each other, and thus the air passage 134 alone may be insufficient. In this embodiment, a plurality of grooves 136 may be formed on the surface of the light blocking film 130.

As shown in FIG. 4, the groove 136 may be formed in the horizontal and vertical directions on the surface of the light blocking film 130, and may be formed at a predetermined interval. In addition, the groove 136 may be formed by pressing the light shielding film 130 in the form of a film, or may be formed by a separate surface processing method.

Since the lens module 100 including the light blocking film 130 has a plurality of air passages between the bonding surfaces of the first lens member 110 and the second lens member 120 as illustrated in FIG. 5, the lens member It is possible to effectively dissipate the swelling pressure generated during the bonding of the fields (110, 120) to the surroundings.

For reference, the third embodiment may be usefully used when the bonding areas of the lens members 110 and 120 are large.

The lens module 100 according to the fourth embodiment may be distinguished from the above-described embodiments in that the surface of the light blocking film 130 is roughly processed.

In the fourth exemplary embodiment, at least one surface of the light blocking film 130 may be polished or corroded to form a fine gap between the light blocking film 130 and the junction portions 114 and 124 of the lens members 110 and 120. have. For example, the surface of the light shielding film 130 may be polished by a grinding machine, or may be immersed in a predetermined chemical solution to be corroded.

When the surface of the light shielding film 130 is polished or corroded as described above, fine protrusions 138 may be formed on the surface of the light shielding film 130 as illustrated in FIG. 7. Here, the protrusion 138 may not only completely prevent the surface of the light blocking film 130 and the junction portions 114 and 124 of the lens members 110 and 120 from being closely attached to each other, but also the light blocking film 130 and the lens members ( Fine air passages may be formed between the 110 and 120.

Therefore, in the present exemplary embodiment, the squeezing force generated when the lens members 110 and 120 are bonded may be eliminated as in the above-described third exemplary embodiment.

Next, a method of manufacturing a lens module according to the present invention will be described with reference to FIG. 9. 8A, 8B, and 8C are views illustrating a method of manufacturing a lens module according to an exemplary embodiment, and FIGS. 9 and 10 are plan views illustrating other forms of the light blocking member illustrated in FIG. 8.

A method of manufacturing a lens module according to an exemplary embodiment of the present disclosure may include preparing a first lens wafer 210, attaching a light blocking film 230, and attaching a second lens wafer 220. In addition, as necessary, the step of forming the air passages 232 in the light blocking film 230 may be separately performed, and the step of cutting the completed lens module array 200 in units of lens modules may be further performed.

As described in the background art, the small lens module 100 may be manufactured in an array form based on a wafer for mass production. Therefore, swelling pressure tends to occur in the process of stacking or bonding a plurality of wafers.

In this embodiment, in consideration of this, before the stacking or bonding of the first lens wafer 210 and the second lens wafer 220, the aeration paths 234 and 236 are connected to the first lens wafer 210. Attaching the formed light blocking film 230 may be performed.

The light blocking film 230 may include a plurality of holes 232 and vents 234 and 236. The hole 232 is formed at a position corresponding to the optical parts 212 and 222 of the lens wafers 210 and 220, and selects only the effective light necessary for developing a subject from the reflected light incident through the optical parts 212 and 222. Can be passed through. Vents 234 and 236 may connect a plurality of different holes 232. Here, some of the air passages 234 and 236 may extend to the edge of the light blocking film 230 as shown in FIGS. 8 and 9 to dissipate the swelling pressure generated during the bonding process of the lens wafers 210 and 220. have.

Meanwhile, the air passages 234 and 236 may be formed in a shape connecting the holes 232 in the horizontal and vertical directions as shown in FIG. 9.

In addition, the light blocking film 230 may be manufactured in the form of connecting a plurality of light blocking members 231 as shown in FIG. 10. Here, the plurality of light blocking members 231 may be connected by the connection part 238 to form one light blocking film 230.

In the light blocking film 230 illustrated in FIG. 10, since the air passages 236 of the light blocking member 231 communicate with each other, the swelling pressure generated during the bonding process of the lens wafers 210 and 220 may be more effectively alleviated. .

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the inventions And various modifications may be made.

100 lens module
110 First Lens 112 First Optics
114 first junction
120 Second lens 122 Second optics
124 2nd junction
130 light shield 132 holes
134 home with 134 aeration
200 lens module array
210 First Lens Wafer 220 Second Lens Wafer
230 light blocking member 234 aeration

Claims (2)

A plurality of lens members stacked and bonded along the optical axis direction; And
A light shielding film disposed between the lens members and having a hole for adjusting an amount of light incident on the lens member;
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And the light shielding film has a ventilation path extending from the hole in the vertical direction of the optical axis. The method of claim 1,
The air vent of the lens module extending in the shape toward the edge of the light shielding film.

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