KR20070023593A - Small camera module with lens having image sensor - Google Patents

Abstract

An image sensor is mounted on the substrate. A base is further formed on the substrate. The base has an opening above the image sensor. The filter is fixed to the opening of the base. The filter has a projection dam material at its periphery. On the filter is arranged a lens barrel for holding the lens.

Image sensor, camera module

Description

Small camera module with lens with built-in image sensor {SMALL CAMERA MODULE WITH LENS HAVING IMAGE SENSOR}

BRIEF DESCRIPTION OF THE DRAWINGS Sectional drawing which shows the structure of the compact camera module of 1st Embodiment of this invention.

2A, 2B and 2C are schematic diagrams showing a method of manufacturing the IR cut-off filter 14 in the small camera module of the first embodiment.

3 is a cross-sectional view showing a configuration of a compact camera module of a second embodiment of the present invention.

4 is a cross-sectional view showing a configuration of a compact camera module of a third embodiment of the present invention.

[Cross Reference of Related Application]

This application enjoys the benefit of priority based on Japanese Patent Application No. 2005-243138, filed August 24, 2005, and the Japanese patent application on which the priority is based is incorporated herein by reference.

The present invention relates to a compact camera module with a lens incorporating an image sensor such as a CCD (charge coupled device) or a CMOS sensor.

Recently, a small camera module with a lens incorporating an image sensor such as a CCD or CMOS sensor has been developed (see, for example, Japanese Patent Laid-Open No. 2004-88181). The small camera module is commercially incorporated into a mobile phone or a portable information terminal.

Miniature camera modules typically have filters on the image sensor, such as cover glass or infrared radiation (IR) blocking filters, optical low pass filters, and the like. The role of this filter is to seal the space on the image sensor, to reduce defects caused by dust occurring later in the assembly process, and to achieve natural color reproducibility by an antireflective coat or an infrared blocking coat deposited on the cover glass. It is.

A conventional problem with such a filter is a defect caused by contaminant generated after assembly. This was determined to be good at the time of pre-shipment testing, but the dust existing in the pipe during transportation or use in the market moves to the effective area, resulting in defects such as black spots and spotting. As a source of these moving dusts, the chipping of the IR blocking filter or the adhesive used for bonding the IR blocking filter to the base is oozed out, or the dust coming out of the screw when the lens barrel is moved. There is this.

In a first aspect the compact camera module of the present invention comprises an image sensor mounted on a substrate; A base formed on the substrate, the base including an opening above the image sensor; A filter fixed to an opening of the base, the filter including a protruding dam material at a periphery thereof; And a lens barrel disposed on the filter to hold the lens.

In a second aspect the miniature camera module of the present invention comprises an image sensor mounted on a substrate; A base formed on the substrate, the base including an opening on an upper side of the image sensor, and having a protrusion near the opening; A filter fixed to the base opening; And a lens barrel disposed on the filter to hold the lens.

The compact camera module of the present invention, viewed from the third aspect, includes an image sensor mounted on a substrate; A base formed on the substrate, the base including an opening on an upper side of the image sensor and having a groove near the opening; A filter fixed to the base opening; And a lens barrel disposed on the filter to hold the lens.

EMBODIMENT OF THE INVENTION Embodiment of this invention is described with reference to drawings. In the description, common parts are denoted by common reference numerals throughout the drawings.

[First Embodiment]

The small camera module of the first embodiment of the present invention will be described.

1 is a cross-sectional view illustrating a configuration of a small camera module of the first embodiment.

As shown in FIG. 1, the compact camera module includes a substrate 11, an image sensor chip 12, a base 13, an IR blocking filter 14, a lens folder 15, a lens barrel 16, and a first camera. The lens 17, the second lens 18, and the lens stopper 19 are provided. As the image sensor chip 12, a CCD or a CMOS sensor is used. The IR cut filter 14 is a filter that cuts out predetermined infrared light.

The image sensor chip 12 is mounted on the substrate 11. In addition, a base 13 is formed on the substrate 11 and on the image sensor chip 12. The base 13 has an opening on the upper side of the image sensor chip 12. An IR cutoff filter 14 is fixed to the opening of the base 13, and a protrusion dam material 14A is formed at the periphery of the IR cutoff filter 14. Here, the space on the image sensor chip 12 is sealed by the base 13 and the IR blocking filter 14. In addition, a normal potting material may be used for the dam material 14A, or an adhesive such as an epoxy resin may be used.

The lens folder 15 is formed on the base 13. In addition, the lens barrel 16 has an aperture and holds the first lens 17 and the second lens 18. In other words, the lenses 17 and 18 are fixed to the lens barrel 16 by the lens stopper 19 so that light passing through the aperture of the lens barrel 16 enters the lenses 17 and 18. A screw is formed by the lens folder 15 and the lens barrel 16. As the screw advances, the lens barrel 16 moves up and down, and the positions of the lenses 17 and 18 are adjusted. In addition, although the case where the base 13 and the lens folder 15 are formed separately here is shown, these may be formed integrally.

The lenses 17 and 18, the IR cut filter 14 and the image sensor chip 12 are arranged on the optical axis, and the light passing through the aperture of the lens barrel 16 passes through the lenses 17 and 18. In addition, an image is formed on the surface of the image sensor chip 12 through the IR cutoff filter 14.

In the small camera module having such a structure, a protruding dam member 14A is formed in the periphery of the IR cutoff filter 14. This dam material 14A is chipped from the IR cut filter 14, adhesive used to adhere the IR cut filter 14 to the base 13, or leaked from the threaded portion to move the lens barrel 16. Moving dust such as dust is prevented from moving on the IR blocking filter 4. As a result, in the pre-shipment test, good quality was determined, but the defects which existed in the pipe during transportation or use in the market move to the effective area, resulting in defects such as black images, stains, and the like.

Next, the manufacturing method of the IR cut filter 14 which has 14 A of dam materials is demonstrated. Usually, the IR cutoff filter 14 is produced by dividing a glass plate called a large plate into individual pieces of a predetermined size. For dividing the glass plate, a dicing apparatus used for cutting a wafer in a normal semiconductor assembly step is used.

2A is a plan view of the glass plate, FIG. 2B is a plan view of the divided IR cut-off filter 14, and FIG. 2C is a cross-sectional view of the IR cut-off filter 14.

First, as shown in FIG. 2A, the dam material 20A is formed in a lattice shape on the glass plate 20. For the dam material 20A, an ordinary potting material may be used, or an adhesive such as an epoxy resin may be used. Subsequently, the glass plate 20 is cut | disconnected on the dam material 20A by dicing, and as shown in FIG. 2B, the individual IR cutoff filter 14 is produced. At this time, by setting the width of the dam material 20A to a predetermined width thicker than the width of the dicing blade, the dam material 14A can remain in a flange shape at the periphery of the IR cut filter 14 after dicing. have.

As described above, according to the first embodiment, it is possible to prevent the moving dust generated after assembly from moving to the effective region by the dam material 14A formed at the periphery of the IR cut-off filter 14. Thereby, defects, such as a black image and a stain which arise with the moving dust which generate | occur | produced after granulation, can be reduced.

Second Embodiment

Next, a second embodiment of the present invention will be described. The same parts as those in the first embodiment will be denoted by the same reference numerals and the description thereof will be omitted.

3 is a cross-sectional view illustrating a configuration of a small camera module of the second embodiment.

The base 21 is formed on the board | substrate 11 and the upper side of the image sensor chip 12 in the small camera module of 2nd Embodiment. The base 21 has an opening in the upper side of the image sensor chip 12, and the projection part 21A is formed in the vicinity of the opening. In addition, the IR cutoff filter 14 is fixed to the opening of the base 21. The rest of the configuration is the same as that of the compact camera module of the first embodiment.

In the small camera module having such a structure, protrusions 21A are formed in the vicinity of the opening of the base 21. This protrusion 21A is provided by chipping of the IR cutoff filter 14, adhesive used to adhere the IR cutoff filter 14 to the base 21, or coming out of the thread to move the rail barrel 16. Moving dust such as dust is prevented from moving onto the IR blocking filter 14. As a result, in the pre-shipment test, good quality was determined, but defects such as black images, stains, etc. that existed in the pipe during transportation or use in the market move to the effective area and can be reduced.

[Third Embodiment]

Next, a third embodiment of the present invention will be described. The same parts as those in the first embodiment are denoted by the same reference numerals and the description thereof will be omitted.

4 is a cross-sectional view illustrating a configuration of the small camera module of the third embodiment.

The base 22 is formed on the board | substrate 11 and the image sensor chip 12 in the small camera module of 3rd Embodiment. The base 22 has an opening on the upper side of the sensor chip 12, and a groove portion (depression portion) 22A is formed in the vicinity of the opening. In addition, the IR cutoff filter 14 is fixed to the opening of the base 22. The rest of the configuration is the same as that of the compact camera module of the first embodiment.

In the small camera module having such a structure, a groove portion 22A is formed in the vicinity of the opening of the base 22. This groove 22A is provided by chipping of the IR cutoff filter 14, adhesive used to adhere the IR cutoff filter 14 to the base 22, or coming out of the thread to move the lens barrel 16. Moving dust such as dust is prevented from moving onto the IR blocking filter 14. As a result, in the pre-shipment test, good quality was determined, but dust existing in the pipe during transportation or use in the market moves to the effective area, and defects such as black images and stains can be reduced. That is, in each embodiment described above, a projection (or groove) may be formed between the base and the filter in order to prevent the adhesive or the moving dust from moving on the IR cutoff filter 14.

In addition, each embodiment mentioned above can be implemented not only individually, but can also be implemented in combination suitably. In addition, each embodiment mentioned above contains the invention of various steps, and it is also possible to extract invention of various steps by the appropriate combination of the several structural requirements disclosed in each embodiment.

Other advantages and modifications other than those described herein can be readily derived by one of ordinary skill in the art. Thus, in a broader aspect of the invention, is not limited to the specific details and representative embodiments described and illustrated herein. Therefore, various modifications may be made without departing from the spirit or scope of the inventive concept as set forth in the appended claims and their equivalents.

According to the embodiment of the present invention, it is possible to provide a compact camera module capable of reducing defects such as black images and stains caused by moving dust generated after assembly.

Claims (16)

An image sensor mounted on the substrate; A base formed on the substrate, the base including an opening above the image sensor; A filter fixed to an opening of the base, the filter including a projection dam material at a periphery thereof; And A lens barrel disposed on the filter to hold the lens Small camera module comprising a. The method of claim 1, Further comprising a filter formed on the base, And a screw portion is formed by the filter and the lens barrel, and the position of the lens is adjusted by moving the screw portion of the lens barrel. The method of claim 1, The lens barrel includes an aperture, and the light incident from the aperture passes through the lens and the filter to form an image on the image sensor. The method of claim 1, The dam material is a compact camera module comprising any one of a potting material (potting material) and epoxy resin. The method of claim 1, And the image sensor comprises any one of a CCD and a CMOS sensor. The method of claim 1, Wherein said filter comprises an IR blocking filter for blocking infrared light. An image sensor mounted on the substrate; A base formed on the substrate, the base including an opening on an upper side of the image sensor, and having a protrusion near the opening; A filter fixed to the base opening; And A lens barrel disposed on the filter to hold the lens Small camera module comprising a. The method of claim 7, wherein Further comprising a folder formed on the base, The screw unit is formed by the folder and the lens barrel, the lens unit is moved by the lens barrel, the compact camera module is adjusted to the position of the lens. The method of claim 7, wherein The lens barrel includes an aperture, and the light incident from the aperture passes through the lens and the filter to form an image on the image sensor. The method of claim 7, wherein And the image sensor comprises any one of a CCD and a CMOS sensor. The method of claim 7, wherein Wherein said filter comprises an IR blocking filter for blocking infrared light. An image sensor mounted on the substrate; A base formed on the substrate, the base including an opening on an upper side of the image sensor and having a groove near the opening; A filter fixed to the base opening; And A lens barrel disposed on the filter to hold the lens Small camera module comprising a. The method of claim 12, Further comprising a folder formed on the base, The screw unit is formed by the folder and the lens barrel, the lens unit is moved by the lens barrel, the compact camera module is adjusted to the position of the lens. The method of claim 12, The lens barrel includes an aperture, and the light incident from the aperture passes through the lens and the filter to form an image on the image sensor. The method of claim 12, And the image sensor comprises any one of a CCD and a CMOS sensor. The method of claim 12, Wherein said filter comprises an IR blocking filter for blocking infrared light.

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