CN102929079A - Camera module - Google Patents

Abstract

The invention discloses a camera module, which comprises a lens, a substrate fixedly matched with the lens, an anti-dazzling screen arranged between the lens and the substrate, and an image sensor fixedly arranged on the substrate, wherein the lens comprises a lens cone, and a lens arranged inside the lens cone; the lens comprises an optical axis; the substrate comprises opposite first surface and second surfaces, and a first through hole penetrating through the first surface and the second surface; the anti-dazzling screen comprises opposite third surface and fourth surface, and a second through hole penetrating through the third surface and the fourth surface; the substrate is arranged between the anti-dazzling screen and the image sensor; an effective photosensitive area of the image sensor is arranged inside the second through hole, and the boundary of the second through hole along a positive projection of an optical axis is arranged inside the boundary of the first through along the positive projection of the optical axis. The camera module provided by the invention can reduce rays projected to the effective photosensitive area after being reflected through the inner wall of the first through hole and the inner wall of the second through hole. Thus, reflected light patterns in the imaged image are reduced.

Description

camera module

technical field

The invention relates to the technical field of optical imaging, in particular to a camera module.

Background technique

The camera module includes a lens barrel, a lens group arranged in the lens barrel, a substrate and an image sensor arranged on the substrate. The substrate is provided with through holes penetrating through the upper and lower surfaces. The through hole allows light to pass through to the image sensor for imaging.

In a traditional camera module, some light is easily reflected by the inner wall of the through hole to the effective photosensitive area of the image sensor, thereby causing severe reflection streaks in the imaged image.

Contents of the invention

In view of this, it is necessary to provide a camera module capable of reducing reflection light streaks.

A camera module includes a lens, a substrate fixedly matched with the lens, a light-shielding sheet arranged between the lens and the substrate, and an image sensor fixed on the substrate. The lens includes a lens barrel and a lens arranged in the lens barrel, and the lens has an optical axis. The substrate has opposite first and second surfaces, and a first through hole passing through the first and second surfaces. The light-shielding sheet includes a third surface and a fourth surface opposite to each other, and a second through hole passing through the third surface and the fourth surface. The substrate is located between the light-shielding sheet and the image sensor. The effective photosensitive area of the image sensor is located in the second through hole, and the boundary of the orthographic projection of the second through hole along the optical axis is located within the boundary of the orthographic projection of the first through hole along the optical axis.

In the camera module provided by the present invention, by setting the positional relationship between the effective photosensitive area, the first through hole and the second through hole according to the above requirements, part of the light cannot reach the effective area of the image sensor after being reflected by the inner wall of the second through hole. photosensitive area, and can reduce the light reaching the inner wall of the first through hole, thereby reducing the light projected to the effective photosensitive area after being reflected by the inner wall of the first through hole and the inner wall of the second through hole, thereby reducing the blur in the formed image Reflected light streaks.

Description of drawings

FIG. 1 is a schematic cross-sectional view of a camera module according to a first embodiment of the present invention. The camera module includes a substrate, a second light shield and an image sensor.

FIG. 2 is a schematic diagram of the positional relationship between the first through hole of the substrate in FIG. 1 , the second through hole of the second light-shielding plate, and the effective photosensitive area of the image sensor.

FIG. 3 is a schematic perspective view of the second light-shielding sheet in FIG. 1 .

4 is a schematic cross-sectional view of a second light-shielding sheet according to the second embodiment of the present invention.

Description of main component symbols

camera module 10 lens barrel 11 first lens 12 second lens 13 first shade 14 lens 15 Substrate 16 Second shade 17, 17a image sensor 18 first surface 161 second surface 162 third surface 172 fourth surface 173 medial side 174 first groove 163 second groove 164 first via 165 Second via 171 Effective photosensitive area 182 Chamfer 175, 175a Boundary of the orthographic projection of the first via along the optical axis 1651 Boundary of the orthographic projection of the second via along the optical axis 1711 optical axis 152

The following specific embodiments will further illustrate the present invention in conjunction with the above-mentioned drawings.

Detailed ways

The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

1-3, the camera module 10 of the first embodiment of the present invention includes a lens barrel 11, a first lens 12, a second lens 13, a first shading sheet 14, a second shading sheet 17, a substrate 16, and an image sensor 18.

The first lens 12 , the second lens 13 and the first shading sheet 14 are housed in the lens barrel 11 , and the first shading sheet 14 is located between the first lens 12 and the second lens 13 . The lens barrel 11 , the first lens 12 , the second lens 13 and the first light-shielding film 14 together form the lens 15 , and the lens has an optical axis 152 .

The base plate 16 has a first surface 161 and a second surface 162 opposite to each other, the first surface 161 is provided with a first groove 163, the second surface 162 is provided with a second groove 164, and communicates with the first groove 163 and the second groove 163. The first through hole 165 of the second groove 164 . The first surface 161 of the substrate 16 can be attached to the lower end surface of the lens barrel 11 by means of glue or the like. In this embodiment, the cross section of the first through hole 165 is a rectangle. The second light-shielding sheet 17 is adhered in the first groove 163 by means of glue or the like. In this embodiment, the substrate 16 is a ceramic substrate.

The second light-shielding sheet 17 is in the shape of a cuboid. A second through hole 171 is opened inside the second light-shielding sheet 17 . The second light-shielding film includes a third surface 172 facing the object side, a fourth surface 173 facing the image side, and an inner surface 174 connected between the third surface and the fourth surface. The inner surface 174 surrounds the second through hole 171 . In this embodiment, a chamfer 175 is provided at the intersection of the third surface 172 and the inner surface 174, and the chamfer 175 is a bevel chamfer. In this embodiment, the cross section of the second through hole 171 is a rectangle. The chamfer 175 can reduce the light projected to the image sensor 18 after being reflected by the inner surface 174 , thereby reducing reflection streaks in the formed image.

The image sensor 18 is fixed in the second groove 164 by soldering or the like, and the effective photosensitive area 182 of the image sensor 18 is located in the second through hole 171 . The boundary 1711 of the orthographic projection of the second through hole 171 along the optical axis 152 is located within the boundary 1651 of the orthographic projection of the first through hole 165 along the optical axis 152 . In this embodiment, the cross-section of the effective photosensitive region 182 is a rectangle.

It can be understood that, in other embodiments, the chamfer 175 may also be provided at the intersection of the fourth surface 173 and the inner surface 174 .

As shown in FIG. 4, it is the second light-shielding sheet 17a of the second embodiment in the camera module 10. The difference between the second light-shielding sheet 17a and the second light-shielding sheet 17 of the first embodiment is that the chamfer 175a is a circle Arc chamfer.

In the camera module provided by the present invention, by setting the positional relationship between the effective photosensitive area, the first through hole and the second through hole according to the above requirements, part of the light cannot reach the effective area of the image sensor after being reflected by the inner wall of the second through hole. photosensitive area, and can reduce the light reaching the inner wall of the first through hole, thereby reducing the light projected to the effective photosensitive area after being reflected by the inner wall of the first through hole and the inner wall of the second through hole, thereby reducing the blur in the formed image Reflected light streaks.

In addition, those skilled in the art can also make other changes within the spirit of the present invention. Of course, these changes made according to the spirit of the present invention should be included within the scope of protection claimed by the present invention.

Claims (6)

1. a camera module is characterized in that, it comprises:

Camera lens, this camera lens comprises lens barrel and is arranged on eyeglass in this lens barrel, and this camera lens has an optical axis;

With the substrate of this camera lens secure fit, this substrate has relative first surface and second surface, and runs through the first through hole of this first surface and this second surface;

Be arranged on the anti-dazzling screen between this camera lens and this substrate, this anti-dazzling screen comprises the 3rd relative surface and the 4th surface, and runs through second through hole on the 3rd surface and the 4th surface; And

Be installed in the image sensor of this substrate, this substrate is between this anti-dazzling screen and this image sensor, and effective photosensitive area of this image sensor is positioned at the second through hole of this anti-dazzling screen, and this second through hole is positioned at this first through hole within the border of this optical axis orthogonal projection along the border of this optical axis orthogonal projection.

2. camera module as claimed in claim 1 is characterized in that, this anti-dazzling screen comprises that also one is connected to the medial surface between the 3rd surface and the 4th surface, and this medial surface is around this second through hole, and the 3rd surface and this medial surface intersection are provided with a chamfering.

3. camera module as claimed in claim 2 is characterized in that, this chamfering is chamfer or circular arc chamfering.

4. camera module as claimed in claim 1 is characterized in that, this substrate is ceramic substrate.

5. camera module as claimed in claim 1 is characterized in that, this first surface offers the first groove, and this first groove and this first through hole connect, and this anti-dazzling screen is arranged in this first groove.

6. camera module as claimed in claim 1 is characterized in that, this second surface offers the second groove, and this second groove and this first through hole connect, and this image sensor is arranged in this second groove.

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