Contact type image sensor having original support member with a reflecting surface

A contact type image sensor comprising:

• (a) a light source to emit a light to illuminate an original;
• (b) an original supporting member for allowing the light from said light source to be transmitted and for supporting said original;
• (c) a photosensor for converting optical information on a read line of said original supporting member into an electric signal;
• and
• (d) a reflecting surface for reflecting a part of the irradiation light from the light source and for leading to said read line, in which said reflecting surface is provided for at least a part of said original supporting member locating on the said opposite to the arrangement side of the light source with respect to said read line, and an optical axis of the illumination light from the light source is positioned to a region between said read line and said reflecting surface or onto said reflecting surface.

A contact type image sensor comprising:

• (a) a light source to emit a light to illuminate an original;
• (b) an original supporting member for allowing the light from said light source to be transmitted and for supporting said original;
• (c) a photosensor for converting optical information on a read line of said original supporting member into an electric signal;
• and
• (d) a reflecting surface for reflecting a part of the irradiation light from said light source and for leading to said read line, in which said reflecting surface is provided for at least a part of said original supporting member locating on the side opposite to the arrangement side of the light source with respect to the read line.
• wherein as said light source, there is used a light source having directing characteristics such that an illuminance on the original surface at said read line position by the light that is directly irradiated from the light source is almost equal to an illuminance on the original surface at the read line position by the light that is reflected by said reflecting surface and is irradiated.