The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 13, 1989
Filed:
Dec. 14, 1987
Kazunori Mine, Shizuoka, JP;
Keisuke Murakami, Shizuoka, JP;
Mamoru Tago, Shizuoka, JP;
Hiromasa Urata, Shizuoka, JP;
Tokyo Electric Co., Ltd., Tokyo, JP;
Abstract
A reading surface of a document is illuminated by a light source, and a light beam reflected on the reading surface is reflected on a reflecting mirror. Then, the reflected light beam is guided in such a direction as to pass in the vicinity of a light shielding plate for shielding the constitutional elements from the light. A lens is located near the light source at a position where the light beam guided in the above direction is allowed to pass. A shading correcting device is made up of a first shading correcting portion formed by a part of the light shielding plate and a second shading correcting portion formed in a body case for holding the constitutional elements. The shading correcting device is designed to restrict a more quantity of light of the light beam incident upon the lens at a portion nearer to an optical axis of the lens. A photoelectric correcting device is provided in a position where the light beam passing through the lens is focused. As a result, photoelectric converting elements in the photoelectric converting device receive an equalized quantity of light of the light beam. A part of the shading correcting device for equalizing the quantity of light of the light beam incident upon the photoelectric converting means is formed by utilizing the light shielding plate. Accordingly, the number of parts may be reduced, and the assembling work may be simplified.