CN102929078A - Camera module - Google Patents

Abstract

A camera module includes a lens, a substrate fixedly matched with the lens, 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 a first surface and a second surface opposite to each other, and a through hole passing through the first surface and the second surface. The substrate further includes an inner side surrounding the through hole. The substrate is located between the lens and the image sensor, and the effective photosensitive area of the image sensor is located in the through hole. The height of the light reflection region on the inner surface in the direction of the optical axis is D. The effective photosensitive area is rectangular, and the cross section of the through hole is rectangular. The long side of the effective photosensitive area is parallel to the long side on the cross section of the through hole. The distance between the long side of the effective photosensitive area and the long side of the corresponding through hole is greater than 0.27D, and the distance between the short side of the effective photosensitive area and the short side of the corresponding through hole is greater than 0.27D.

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, 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 a first surface and a second surface opposite to each other, and a through hole passing through the first surface and the second surface. The substrate further includes an inner side surrounding the through hole. The substrate is located between the lens and the image sensor, and the effective photosensitive area of the image sensor is located in the through hole. The height of the light reflection region on the inner surface in the direction of the optical axis is D. The effective photosensitive area is rectangular, and the cross section of the through hole is rectangular. The long side of the effective photosensitive area is parallel to the long side on the cross section of the through hole. The distance between the long side of the effective photosensitive area and the long side of the corresponding through hole is greater than 0.27D, and the distance between the short side of the effective photosensitive area and the short side of the corresponding through hole is greater than 0.27D.

In the camera module provided by the present invention, by setting the positional relationship between the effective photosensitive area and the through hole according to the above requirements, most of the light cannot reach the effective photosensitive area of the image sensor after being reflected by the inner wall of the through hole, thereby reducing the number of through holes. The light projected to the effective photosensitive area after being reflected by the inner wall of the hole reduces reflected light streaks in the formed image.

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 and an image sensor.

FIG. 2 is a schematic diagram of the positional relationship between the through hole of the substrate and the effective photosensitive area of the image sensor in FIG. 1 .

3 is a schematic diagram of the positional relationship between the through hole, the effective photosensitive area and the imaging range of the lens of the camera module 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 Shading film 14 lens 15 Substrate 16 infrared filter 17 image sensor 18 optical axis 152 first surface 161 second surface 162 first groove 163 second groove 164 through hole 165 medial side 167 Effective photosensitive area 182 The long side 1821, 1651 Short side 1822, 1652 imaging range 151

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.

1-2, 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 shading film 14, an infrared filter 17, a substrate 16, and an image sensor Device 18.

The first lens 12 , the second lens 13 and the shading sheet 14 are accommodated in the lens barrel 11 , and the 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 shading sheet 14 together form a lens 15 . The lens 15 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. Two through holes 165 of the groove 164 . The substrate 16 further includes an inner side 167 surrounding the through hole 165 . The height of the area where light reflection occurs in the inner surface 167 in the direction of the optical axis 152 is D. In this embodiment, the entire inner surface 167 will reflect, so D is the height of the inner surface 167 in the direction of the optical axis 152 . 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 through hole 165 is a rectangle. The infrared filter 17 is stuck in the first groove 163 by means of glue or the like. In this embodiment, the substrate 16 is a ceramic substrate.

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 through hole 165 of the substrate 16 . In this embodiment, the effective photosensitive region 182 is rectangular, and each side of the effective photosensitive region 182 is parallel to the corresponding side of the through hole 165 .

The distance L between the long side 1821 of the effective photosensitive region 182 and the long side 1651 of the corresponding through hole 165 (that is, the side adjacent to the long side 1821 of the effective photosensitive region 182 ) is greater than 0.27D, and the effective photosensitive region 182 The distance S between the short side 1822 and the corresponding short side 1652 of the through hole 165 (ie, the side adjacent to the short side 1822 of the effective photosensitive region 182 ) is greater than 0.27D.

Preferably, the imaging range 151 of the lens 15 is located in the through hole 165 , as shown in FIG. 3 . In this embodiment, this design is realized by increasing the size of the through hole 165 . Of course, under the premise of not changing the size of the through hole 165, the imaging range 151 of the lens 15 can also be reduced by reducing the size of the optical parts of the first lens 12 and the second lens 13, so that the imaging range 151 is located in the through hole. within 165. With such a design, basically no light can reach the inner wall of the through hole 165, so that the reflected light streaks in the imaged image can be basically eliminated. In this embodiment, the imaging range 151 is a circular area.

In the camera module provided by the present invention, by setting the positional relationship between the effective photosensitive area and the through hole according to the above requirements, most of the light cannot reach the effective photosensitive area of the image sensor after being reflected by the inner wall of the through hole, thereby reducing the number of through holes. The light projected to the effective photosensitive area after being reflected by the inner wall of the hole reduces reflected light streaks in the formed image.

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 through hole of this first surface and this second surface, and this substrate further comprises the medial surface around this through hole, and the xsect of this through hole is rectangle; And

Be installed in the image sensor on this substrate, this substrate is between this camera lens and this image sensor, and effective photosensitive area of this image sensor is positioned at this through hole, the height of zone on optical axis direction that light reflection occurs in this medial surface is D, this effective photosensitive area is rectangle, the long limit of this effective photosensitive area is parallel with the long limit on this through hole xsect, distance between the long limit of the long limit of this effective photosensitive area and corresponding through hole is all greater than 0.27D, and the distance between the minor face of the minor face of this effective photosensitive area and corresponding through hole is all greater than 0.27D.

2. camera module as claimed in claim 1 is characterized in that, the areas imaging of this camera lens is positioned at this through hole.

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

4. camera module as claimed in claim 1 is characterized in that, further comprises infrared fileter, and this first surface offers the first groove, and this first groove and this through hole connect, and this infrared fileter is arranged in this first groove.

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

6. camera module as claimed in claim 1 is characterized in that, this lens barrel comprises one towards the lower surface of this first surface, and this lower surface is attached on this first surface.

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