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:
Apr. 13, 1993
Filed:
Jul. 13, 1990
Yoshiyuki Ishimitsu, Hino, JP;
Konica Corporation, Tokyo, JP;
Abstract
An image reading apparatus that illuminates or irradiates a document by scanning for reading in two orthogonal directions. In a mode preceding a reading mode, it photoelectrically converts transmitted or reflected light into an image signal, employs a stored threshold value for comparison with the image signal, and discriminates document position or size based on the comparison to set a reading area for the document, such as a medical X-ray film. A reading control inhibits the reading mode while the document is irradiated in the sub-scanning direction from its tip edge across a predetermined distance. The discrimination of a possibly faulty position, including some inclination error, of the X-ray film and the setting of the reading area compensates for the faulty position before the subsequent reading mode begins. The setting of the reading area can involve some re-conveying of the document. An alarm is generated if the discrimination determines that an appropriate reading area cannot be set. Different types of amplification are provided for the discrimination and for the subsequent reading by a switching arrangement based on a discrimination of the operating mode.