JPH06118224A - Glass filter for solid image pickup device - Google Patents

Abstract

PURPOSE:To provide a solid image pickup device improving the utilization efficiency of the light fed to the solid image pickup device and having high sensitivity by providing a lens layer for collecting the light at the position corresponding to many light detection sections of the solid image pickup device arranged into a matrix shape. CONSTITUTION:A lens layer 10 for collecting the light is provided at the position corresponding to many light detection sections 6 of a solid image pickup device 5 arranged into a matrix shape. The refraction factor of the material of the lens layer 10 must be higher than the refraction factor of the materials of a layer 9a and an adhesive layer 8. For the shape of the lens layer 10, lenses may be individually formed one by one to face many light detection sections of the solid image pickup device 5 arranged into a matrix shape, or a stripe-like lens corresponding to all light detection sections 6 arranged in the vertical direction. The light shielded by the shade section 7 of the solid image pickup device 5 can be collected to the light detection sections 6 of the solid image pickup device 5 by the lens layer 10 provided on a glass filter.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a glass filter of a solid-state image pickup device used for constructing a solid-state image pickup device used in a video camera or the like.

[0002]

2. Description of the Related Art Solid-state image pickup devices are widely used in video cameras, surveillance cameras and the like. In constructing this solid-state imaging device, an adhesive glass filter may be used for reasons such as colorization or provision of an optical black portion. Hereinafter, a glass filter of a conventional solid-state imaging device will be described with reference to the drawings.

FIG. 2 is a perspective view of a glass filter of a conventional solid-state image pickup device, FIG. 3 is an enlarged view of a central portion of the glass filter, and FIG. 4 is a diagram showing the glass filter bonded to the solid-state image pickup device with an adhesive. FIG. 2 to 4, 1 is a glass substrate, 2 is a light-shielding portion for providing an optical black portion, 3 is a pixel portion corresponding to a light sensing portion of a solid-state imaging device, 4 is a pixel separation portion, and 5 is solid-state imaging. A device, 6 is a light sensing part of a solid-state image pickup device, 7 is a light shielding part thereof, 8 is an adhesive layer, and 9 is an uppermost layer for protecting a dye layer of a glass filter. Moreover, the arrow in FIG. 4 shows incident light. The glass filter is composed of the glass substrate 1, the light shielding portion 2, the pixel portion 3, the pixel separating portion 4 and the uppermost layer 9.

The operation of the solid-state image pickup device configured as described above will be described below. First, the light reaching the glass substrate 1 is transmitted through the pixel portion 3, the uppermost layer 9 and the adhesive layer 8, enters the light sensing portion 6, and is converted into an electric signal.

[0005]

However, in the above-mentioned conventional structure, the light incident on the light shielding portion 7 of the solid-state imaging device is not incident on the light sensing portion 6, and the utilization efficiency of the light incident on the solid-state imaging device is reduced. There is a problem that the sensitivity of the solid-state imaging device, which is the ratio of the output electric signal to the amount of incident light, is reduced.

In view of the above problems, an object of the present invention is to provide a glass filter for a solid-state image pickup device, which can improve the utilization efficiency of light incident on the solid-state image pickup device and realize a highly sensitive solid-state image pickup device. To do.

[0007]

In order to achieve this object, a glass filter of a solid-state image pickup device according to the present invention is provided with a light filter at a position corresponding to each light-sensing section arranged in a matrix of the solid-state image pickup device. It is characterized in that a lens layer for collecting is provided.

[0008]

According to the structure of the present invention, since the lens layer is provided at the position corresponding to the light sensing portion of the solid-state image pickup device, the light blocked by the area other than the light sensing portion of the solid-state image pickup device is solidified. The light can be collected in the light sensing portion of the image pickup device, and the light utilization efficiency can be improved and the sensitivity of the solid-state image pickup device can be increased.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view when a glass filter of a solid-state imaging device according to an embodiment of the present invention is bonded to the solid-state imaging device. In FIG. 1, 9a is a conventional example (FIG. 4).
The layer corresponding to the uppermost layer 9 in FIG.
It is a lens layer formed using a material having a refractive index different from that of a and the adhesive layer 8. The same portions as those in FIG. 4 are denoted by the same reference numerals, and arrows in the drawings indicate incident light.

In the glass filter of this solid-state image pickup device, a lens layer 10 for collecting light is provided at a position corresponding to each of the light sensing portions 6 arranged in a matrix of the solid-state image pickup device 5. The refractive index of the material of the lens layer 10 needs to be higher than that of the materials of the layer 9a and the adhesive layer 8. Regarding the shape of the lens layer 10, a method of individually forming one lens in each of the light sensing portions 6 arranged in a matrix of the solid-state imaging device, and a method of vertically sensing light are arranged. There is a method of forming a striped lens corresponding to all the parts 6.

The operation of the solid-state image pickup device having the above structure will be described below. As indicated by the arrow in the figure, the light incident on the pixel unit 3 is refracted by the lens layer 10 and is condensed on the light sensing unit 6 of the solid-state imaging device. Here, of the light that has entered the pixel unit 3, if it goes straight without being refracted, the light that was blocked by the light blocking unit 7 of the solid-state imaging device is refracted by the lens layer 10 and enters the light sensing unit 6. Will be done.

As described above, according to this embodiment, the light blocked by the light shielding portion 7 of the solid-state imaging device is collected by the lens layer 10 provided on the glass filter to the light sensing portion 6 of the solid-state imaging device. Therefore, it is possible to improve the light utilization efficiency and enhance the sensitivity of the solid-state imaging device without changing the dimensions of the light sensing unit 6 of the solid-state imaging device.

[0013]

As described above, since the glass filter of the solid-state image pickup device of the present invention is provided with the lens layer at the position corresponding to the light-sensing portion of the solid-state image pickup device, the region other than the light-sensing portion of the solid-state image pickup device is provided. The light blocked by the light can be collected in the light sensing portion of the solid-state imaging device, and the light utilization efficiency can be improved and the sensitivity of the solid-state imaging device can be increased.

[Brief description of drawings]

FIG. 1 is a cross-sectional view when a glass filter of a solid-state imaging device according to an embodiment of the present invention is bonded to the solid-state imaging device.

FIG. 2 is a perspective view of a glass filter of a conventional solid-state imaging device.

FIG. 3 is an enlarged view of a central portion of a glass filter of a conventional solid-state imaging device.

FIG. 4 is a sectional view when a glass filter of a conventional solid-state imaging device is bonded to the solid-state imaging device.

[Description of Reference Signs] 1 glass substrate 3 pixel portion 4 pixel separation portion 5 solid-state imaging device 6 light-sensing portion of solid-state imaging device 7 light-shielding portion of solid-state imaging device 10 lens layer

Claims (1)

[Claims] 1. A glass filter for a solid-state imaging device comprising a pixel portion and a pixel separation portion on a glass substrate, wherein the glass filter is provided at a position corresponding to each of the light sensing portions arranged in a matrix of the solid-state imaging device. A glass filter for a solid-state image pickup device, comprising a lens layer for collecting light.