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:
Jan. 16, 2001
Filed:
Mar. 18, 1998
Kenichi Nagaharu, Nagano, JP;
Noriyuki Nouda, Nagano, JP;
Seiko Epson Corporation, Tokyo, JP;
Abstract
A focus adjusting plate,serving as a reference for focus adjustment is attached to a glass plane of a document stand,, and a lens carriage,in a reading unit,is made movable minutely in a sub-scanning direction. The lens carriage is moved one pitch by one pitch within a minute movement range to read black stripes and white areas of the focus adjusting plate,. The position of the lens carriage providing a maximum contrast is obtained, and the lens carriage,is fixed at the position. Thus, the optical path length L from the upper face of the glass plane of the document stand,to the lens,via mirrors,and,is focus-adjusted. Accordingly, errors such as variations in accuracy in fabrication can be canceled to provide an image data in focus.