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:
Dec. 11, 2001
Filed:
Aug. 05, 1996
Yoshito Haba, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
An image input apparatus capable of optimizing an error recovery process of data transfer between a camera unit and an image processing unit. When a communication driver of the camera unit detects a check sum error, an ACK (acknowledge) frame added with a reception error parameter is transmitted to the image processing unit. Upon reception of this ACK frame, a communication driver of the image processing unit retransmits a command frame. The communication driver of the camera unit checks the check sum of the received frame, and if there is no error, an ACK frame added with a normal reception parameter is transmitted to the image processing unit to notify an upper level control module of a command reception.