Image sensor

Abstract

An image sensor includes a light source; a bar-shaped light-guiding element having a first light-emitting section, which propagates light from the light source and irradiates an document from an oblique direction, and a second light-emitting section emitting light in a carrying direction of the document; a lens converging the light reflected from the document; a sensor receiving the light passed through the lens; a reflector disposed on the opposite side of the light-guiding element, by reflecting the light from the second light-emitting section such that an optical path of the light emitted from the second light-emitting section is located between the lens and the document, and irradiating the document from an oblique direction; and first and second light-scattering layers formed in areas opposed to the first and the second light-emitting sections, respectively, in the light-guiding element.

What is claimed is: 
     
       1. An image sensor comprising:
 a light source; 
 a light guide having a rod-like shape, providing said light source at both sides thereof, and including: a first emitting section for emitting light from an oblique direction with reference to a radiated section of a sheet of copy, with light of said light source being propagated in a main scanning direction with reflection inside thereof; and a second emitting section for emitting light in the transmitting direction of said sheet of copy; 
 a lens body for converging light reflected from said radiated section of said sheet of copy; 
 a sensor for receiving light passed through said lens body; 
 a reflection body, positioned at an opposite side of said light guide with reference to said lens body, for emitting light from an oblique direction with reference to said radiated section of said sheet of copy, with light from said second emitting section being reflected such that a light path of said light emitted from said second emitting section is in between said lens body and said sheet of copy; and 
 first and second light scattering layers respectively formed to sections facing said first and second emitting sections in said light guide, wherein 
 light reflected by said first and second light scattering layers is emitted through said first and second emitting sections. 
 
     
     
       2. An image sensor comprising:
 a light source; 
 a light guide having a rod-like shape, providing said light source at one end thereof or both sides thereof, and including: a first emitting section for emitting light from an oblique direction with reference to a radiated section of a sheet of copy, with light of said light source being propagated in a main scanning direction with reflection inside thereof; and a second emitting section for emitting light in the transmitting direction of said sheet of copy; 
 a rod lens array, extending in said main scanning direction, for converging light reflected from said radiated section of said sheet of copy; 
 a sensor for receiving light passed through said rod lens array; 
 a reflection body, positioned at an opposite side of said light guide with reference to said rod lens array, for emitting light from an oblique direction with reference to said radiated section of said sheet of copy, with light from said second emitting section being reflected such that a light path of said light emitted from said second emitting section is in between said rod lens array and said sheet of copy; and 
 first and second light scattering layers respectively formed to sections facing said first and second emitting sections in said light guide, wherein, 
 light reflected by said first and second light scattering layers is emitted through said first and second emitting sections, and 
 said end section of said light guide to which said light source is positioned is light-shielded and an effective lighting region and an ineffective region are formed in said light guide. 
 
     
     
       3. An image sensor comprising:
 a light source; 
 a light guide having a rod-like shape, providing said light source at one end thereof or both sides thereof, and including: a first emitting section for emitting light from an oblique direction with reference to a radiated section of a sheet of copy, with light of said light source being propagated in a main scanning direction with reflection inside thereof; and a second emitting section for emitting light in the transmitting direction of said sheet of copy; 
 a rod lens array, extending in said main scanning direction, for converging light reflected from said radiated section of said sheet of copy; 
 a sensor for receiving light passed through said rod lens array; 
 a reflection body, positioned at an opposite side of said light guide with reference to said rod lens array, for emitting light from an oblique direction with reference to said radiated section of said sheet of copy, with light from said second emitting section being reflected such that a light path of said light emitted from said second emitting section is in between said rod lens array and said sheet of copy; 
 first and second light scattering layers respectively formed to sections facing said first and second emitting sections in said light guide; and 
 a light-shielding cover for covering an exterior of said light guide including said first and second scattering layers, except for said first and second emitting sections, wherein 
 light reflected by said first and second light scattering layers is emitted through said first and second emitting sections, and 
 said end section of said light guide to which said light source is positioned is light-shielded and an effective lighting region and an ineffective region are formed in said light guide. 
 
     
     
       4. A light guide having a rod-like shape, providing a light source at both sides thereof, and comprising:
 a first emitting section for emitting light from an oblique direction with reference to a radiated section of a sheet of copy, with light of said light source being propagated in a main scanning direction with reflection inside thereof;   a second emitting section for emitting light in the transmitting direction of said sheet of copy; and   first and second light scattering layers respectively formed to sections facing said first and second emitting sections in said light guide,   wherein light reflected by said first and second light scattering layers is emitted through said first and second emitting sections.   
     
     
       5. A lighting equipment comprising:
 a light source;   a light guide having a rod-like shape, providing said light source at both sides thereof, and including: a first emitting section for emitting light from an oblique direction with reference to a radiated section of a sheet of copy, with light of said light source being propagated in a main scanning direction with reflection inside thereof; a second emitting section for emitting light in the transmitting direction of said sheet of copy; and first and second light scattering layers respectively formed to sections facing said first and second emitting sections in said light guide, wherein light reflected by said first and second scattering layers is emitted through said first and second emitting sections; and   a reflection body, positioned at an opposite side of said light guide, for emitting light from an oblique direction with reference to said radiated section of said sheet of copy, with light from said second emitting section being reflected.