US 5,489,992 AGranted

Contact image sensor with continuous light source positioned adjacent to detection object

AssigneeMitsubishi Denki Kabushiki Kaisha

InventorTakafumi Endo

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Abstract

A contact image sensor has in an upper portion of a housing a rod-like continuous light source for emitting light directly to an object. The continuous light source is coated, over its entire outer glass surface, except at an irradiating portion, with a black paint to eliminate irradiation of unnecessary light. Inside the housing, there are accommodated a condenser lens for concentrating the reflected light from the object, and a sensor board on which sensor chips and various electronic components such as logic ICs are arranged, each sensor chip being composed of a light-receiving portion for receiving the light concentrated by the condenser lens and a driver circuit. The passageway of the reflected light from the object is occupied by a transparent resin to prevent any foreign matter from entering from the surroundings.

Claims15

Dependent claims

A contact image sensor comprising:

(a) at least one continuous light source for emitting light to a detection object while the detection object is conveyed along a guide;
(b) a lens for gathering the light reflected by the detection object;
(c) a sensor board on which a number of light receiving portions for receiving the light from said lens are arranged;
and
(d) a housing for supporting said continuous light source, said lens and said sensor board;
(e) said continuous light source having an external non-light-emitting supporting surface portion which forms at least part of the support surface for said detection object while the detection object is being conveyed along said guide and having an external light irradiating surface portion adjacent to said non-light-emitting supporting surface portion and which is positioned immediately adjacent to the detection object while the detection object is being conveyed along said guide.

3 more elements

Dependencies are inferred from the claim text.