JP2004064272A - Camera module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a camera module capable of sufficiently suppressing occurrence of flair even when miniaturizing and low profile are adopted for the camera module. <P>SOLUTION: A frame 2 is formed on a board 5 so that an imaging element 4 and a lens 1 are laid out at a gap on the board 5. Further, an infrared ray elimination filter 3 is provided between the imaging element 4 and the lens 1 and the infrared ray elimination filter 3 is placed in close contact with the imaging element 4. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a camera module using an image sensor such as a CCD and a CMOS.
[0002]
[Prior art]
2. Description of the Related Art In recent years, camera modules using image sensors such as CCDs and CMOSs have been developed as image sensors for mobile phones and information terminals. FIG. 3 is a schematic sectional view showing a conventional camera module. As shown in FIG. 3, a frame 9 is formed on the substrate 5 so that the imaging device 4 and the lens 1 on the substrate 5 are arranged with a gap.
[0003]
Further, an infrared removal filter 10 is provided between the imaging device 4 and the lens 1. The imaging device 4 such as a CCD or a CMOS has a characteristic of being sensitive to light in an infrared region that cannot be seen by human eyes. When such incident light is reflected in the frame 9, the reflected light is reflected. The light is received by the image sensor 4 and causes a flare phenomenon in which exposure unevenness and exposure fog occur. In order to remove such light in the invisible region, an infrared removal filter 10 (IR cut filter) is used. By providing the infrared removal filter 10, the occurrence of the flare phenomenon can be reduced, and a natural image similar to a normal state seen by a human can be obtained.
[0004]
[Problems to be solved by the invention]
However, the conventional camera module has the following problems. In the configuration of the conventional camera module as shown in FIG. 3, since an air layer exists between the infrared exclusion filter 10 and the image sensor 4, incident light passing through the infrared elimination filter 10 is received by the image sensor 4. By the time, the light may be reflected by the frame body 9, which may cause a flare phenomenon.
[0005]
In a conventional configuration, the periphery of the infrared exclusion filter 10 may be an area where the flare phenomenon is likely to occur. More specifically, the incident light is diffracted at the edge portion 11 of the frame 9 provided for installing the infrared elimination filter 10 on the frame 9, and the luminance at the peripheral portion of the infrared elimination filter 10 is reduced. Get higher. Therefore, reflection on the end face 12 of the infrared elimination filter 10 may easily cause a flare phenomenon. In order to suppress the reflection at the end face 12, it is conceivable to provide the infrared removal filter 10 so that the end face 12 and the frame 9 are separated from each other. It was difficult to determine the position so as not to come into contact.
[0006]
Furthermore, in order to mount the camera in a small device such as a mobile phone that is becoming smaller and thinner, the dimensions of the entire camera module including the dimensions of the image sensor 4 and the lens 1 are becoming smaller and smaller. When the size of the frame 9 is reduced, a region where the flare phenomenon is likely to occur, which is a peripheral portion of the infrared removal filter 10, is relatively enlarged in the radial direction, and the reflected light is easily received by the image sensor 4. However, there is a problem that it cannot be ignored even in the peripheral portion of the image.
[0007]
The present invention has been made in order to solve the problems of the related art, and an object of the present invention is to provide a camera module that can sufficiently suppress a flare phenomenon even if the camera is reduced in size and thickness.
[0008]
[Means for Solving the Problems]
A camera module according to the present invention has been made in order to solve the above-described problem, and a frame is formed on the substrate so that an imaging element and a lens on the substrate are arranged with a gap. A camera module including an infrared elimination filter between the imaging element and the lens, wherein the infrared exclusion filter is in close contact with the imaging element.
[0009]
The camera module according to the present invention is characterized in that the frame and the infrared exclusion filter are separated from each other.
[0010]
Further, in the camera module according to the present invention, as in claim 3, the frame body is formed by being divided into a lens side frame body abutting on the lens and a substrate side frame body abutting on the substrate. The lens-side frame and the substrate-side frame are attached so that the distance between the lens and the image sensor can be changed.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic sectional view showing a camera module according to a first embodiment of the present invention.
[0012]
As shown in FIG. 1, the camera module according to the first embodiment of the present invention has a frame on the substrate 5 such that the image sensor 4 and the lens 1 on the substrate 5 are arranged with a gap. A camera module in which a body 2 is formed and an infrared elimination filter 3 is provided between the imaging element 4 and the lens 1, wherein the infrared elimination filter 3 is in close contact with the imaging element 4. It is.
[0013]
Here, the image sensor 4 may be any image sensor as long as an infrared filter such as a CCD or a CMOS can be attached thereto.
[0014]
As described above, since the infrared elimination filter 3 is in close contact with the image sensor 4, there is no air layer between the infrared elimination filter 3 and the image sensor 4. The incident light is no longer reflected on the frame 2 again, and the occurrence of the flare phenomenon can be sufficiently suppressed even if the entire camera module is reduced in size and thickness. Further, since there is no need to provide an edge portion to the frame body 2 and bring the infrared removal filter 3 into contact, it is possible to suppress the peripheral portion of the infrared removal filter 3 from becoming an area where the flare phenomenon is likely to occur.
[0015]
In order to make the infrared removal filter 3 and the image sensor 4 close to each other, an adhesive may be poured between the two and adhered.
[0016]
In the present embodiment, as shown in FIG. 1, the frame 2 and the infrared removal filter 3 are configured to be separated from each other.
[0017]
The infrared elimination filter 3 only needs to be in close contact with the image sensor 4 so as to cover the image sensor 4, so that the infrared elimination filter 3 can be easily positioned. By separating the frame body 2 and the infrared elimination filter 3, reflection at the end face of the infrared elimination filter 3 can be suppressed. Therefore, it is possible to suppress the occurrence of the flare phenomenon due to the reflection at the end face of the infrared elimination filter 3 without making the positioning of the infrared elimination filter 3 difficult.
[0018]
Subsequently, a second embodiment of the present invention will be described. FIG. 2 is a schematic sectional view showing a camera module according to a second embodiment of the present invention. In FIG. 2, the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.
[0019]
The difference between the second embodiment and the first embodiment is that the frame is divided into a lens-side frame 7 contacting the lens 1 and a substrate-side frame 8 contacting the substrate 5. The lens-side frame 7 and the substrate-side frame 8 are configured so that the distance between the lens 1 and the imaging element 4 can be changed.
[0020]
In this case, the frame body is formed separately on the lens 1 side and the substrate 5 side (that is, on the imaging element 4 side), and the lens side frame is formed so that the distance between the lens 1 and the imaging element 4 can be changed. The body 7 and the board side frame 8 are attached. This makes it easy to mount the lens when forming the camera module. Further, the camera module can be adjusted in focus.
[0021]
In addition, as shown in FIG. 2, the lens-side frame 7 and the substrate-side frame 8 may be attached by forming a thread 6 and screwing them together.
[0022]
【The invention's effect】
As described above, according to the camera module of the present invention, since the infrared removal filter is in close contact with the imaging device, there is no air layer between the infrared removal filter and the imaging device. The incident light that has passed through the filter is no longer reflected on the frame again, and the occurrence of the flare phenomenon can be sufficiently suppressed even if the entire camera module is reduced in size and thickness. Further, since there is no need to provide an edge portion on the frame and make the infrared removal filter abut, it is possible to suppress the peripheral portion of the infrared removal filter from becoming an area where the flare phenomenon is likely to occur.
[Brief description of the drawings]
FIG. 1 is a schematic sectional view showing a camera module according to a first embodiment of the present invention; FIG. 2 is a schematic sectional view showing a camera module according to a second embodiment of the present invention; FIG. Schematic sectional view showing a camera module [Explanation of reference numerals]
REFERENCE SIGNS LIST 1 lens 2 frame 3 infrared removing filter 4 imaging element 5 substrate 7 lens side frame 8 substrate side frame

Claims (3)

In a camera module, a frame is formed on the substrate so that the imaging device and the lens on the substrate are arranged with a gap, and an infrared removal filter is provided between the imaging device and the lens. So,
The camera module, wherein the infrared exclusion filter is in close contact with the image sensor. The camera module according to claim 1, wherein the frame and the infrared exclusion filter are separated from each other. The frame is formed by being divided into a lens-side frame abutting on the lens and a substrate-side frame abutting on the substrate, and the lens-side frame and the substrate-side frame are The camera module according to claim 1, wherein a distance between the lens and the image sensor is changeable.

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