JPS5846065B2 - Solid-state photoelectric conversion device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid-state photoelectric conversion device comprising a light receiving element array used in a document reading system of a facsimile transmitter or the like.

For example, as shown in FIG. 1, the solid-state photoelectric conversion device includes a light source 2 that illuminates an original 1, a photodiode that receives reflected light from the original 1, and converts it into an electrical signal, and a charge transfer element (C).
It consists of an array of light-receiving elements such as CD, etc., and is arranged close to the original 1, as shown by reference numeral 3.

As shown in FIG. 2, such a solid-state photoelectric conversion device usually has light-receiving elements 4 arranged in a line on a transparent substrate 5 and covered with a transparent protective layer 6. 5 and a transparent protective layer 6 to illuminate the original 1, and the reflected light from the original 1 is incident on the light receiving element 4.

In such a configuration, regarding the sub-scanning direction,
As shown in FIG. 3, when the original 1 is illuminated from the light source 2 in the range shown by the chain line 7, the light receiving range of the light receiving element 4 is the shaded area 8.
Since the reflected light is received from a wide range, the resolution is low.In order to improve this resolution, it is possible to move the light receiving element 4 closer to the original 1, but it is possible to Since illumination efficiency decreases, it is necessary to maintain a certain distance between the original 1 and the light receiving element 4.

In addition, in the main scanning direction, as shown in FIG. 4, reflected light from the shaded area 8 from the original 1 enters the light receiving element 4, and reflected light from the original 1 enters the adjacent light receiving elements. The problem was that the resolution was low because of the multiple incidences.

The present invention improves the conventional drawbacks as described above, and its purpose is to improve resolution by limiting incident light to the light receiving element.

Examples will be described in detail below.

FIG. 5 is a cross-sectional view of an embodiment of the present invention, and FIG. 6 is a top view, in which 10 is a transparent substrate, 11 is a transparent protective layer, and 12 is a CdS
, photodiode, solar cell, charge transfer device (CCD)
13 is an opaque layer.

This opaque layer 13 protrudes from the light receiving surface of the light receiving element 12,
Moreover, it is provided so as to surround the light-receiving surface of the light-receiving element 12.

With this configuration, in the sub-scanning direction, when the original 1 is illuminated from the light source 2 through the transparent substrate 10 and the transparent protective layer 11, as shown in FIG. The incident light is restricted, and reflected light from the original 1 is incident within a narrow range.

That is, even when a light receiving element of the same size as the conventional one is used, the reflected light from the document 1 in a narrow range is received, so that the resolution can be improved.

In addition, in the main scanning direction, as shown in FIG. 8, the light reflected from the original 1 is reflected by the opaque layer 13 on the light-receiving element 12 within a shaded area 14, and the light-receiving range between adjacent light-receiving elements is This eliminates the possibility of overlapping, and high-resolution photoelectric conversion becomes possible.

As explained above, in the present invention, the light receiving elements 12 are arranged on the transparent substrate 10, the opaque layer 13 is provided around the light receiving elements 12, and the opaque layer is made to protrude from the light receiving surface of the light receiving elements 12. The original 1 is illuminated through the light receiving element 10, and the reflected light from the original 1 is received by the light receiving element 12 and photoelectrically converted.Unwanted incident light can be blocked by the opaque layer 13 provided around the light receiving element. Therefore, the light reflected from the original document 1 in a narrow range is incident on the light receiving element 12, thereby enabling high-resolution photoelectric conversion.

In this case, the height of the opaque layer 13 protruding from the light-receiving surface of the light-receiving element 12 can be selected in consideration of the light-receiving area of the light-receiving element 12, the distance from the original 1, and the like.

[Brief explanation of drawings]

Figure 1 is a schematic perspective view showing the relationship between a solid-state photoelectric device and a document, Figure 2 is a sectional view of a conventional solid-state photoelectric conversion device, and Figures 3 and 4 are explanations of light reception in the sub-scanning direction and the main scanning direction. Figure 5 is a sectional view of an embodiment of the present invention, Figure 6 is a top view thereof,
FIGS. 7 and 8 are explanatory diagrams of light reception in the sub-scanning direction and the main scanning direction according to the embodiment of the present invention. 5.10 is a transparent substrate, 6.11 is a transparent protective layer, 4.12
1 is a light receiving element, and 13 is an opaque layer.

Claims (1)

[Claims] 1. An opaque layer protruding from the light-receiving surface of the light-receiving element is provided around each light-receiving element in a row of light-receiving elements arranged on a transparent substrate, an original is illuminated through the transparent substrate, and the light reflected from the original is reflected by the light-receiving element. A solid-state photoelectric conversion device characterized by having a configuration in which photoelectric conversion is performed using an element.