Patent ID: 6252682
Filing Date: 2001-06-26
Classification: G03G,H04N

Abstract:
A document sensing device comprising:a light source comprising an LED;shaping means for shaping light issuing from said light source to thereby form a narrow beam;scanning means for steering said beam with a rotating or a vibrating reflection member to thereby cause said beam to scan a document;optical isolator means for separating light reflected from the document and returning an illumination path on an optical path;condensing means for condensing the light separated by said optical isolator means;photoelectric transducing means for transforming the light condensed by said condensing means to a corresponding electric signal; andedge sensing means for sensing, based on the electric signal and a timing for scanning the document, edges of the document to thereby determine a size and a position of the document wherein,said condensing means and said photoelectric transducing means are held by jig rotatable about an optical axis of said optical path.