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:
Mar. 24, 1987
Filed:
Apr. 30, 1984
Hitachi Medical Corporation, , JP;
Abstract
An image reader having a high sensitive detection system for detecting a variation in a first light quantity to generate a first output, a low sensitive detection system for detecting a variation in a second light quantity to generate a second output where the second light quantity is greater than the said first light quantity, and a signal composing circuit for receiving the outputs of the high and low sensitive detection systems, each of the detection systems being so disposed as to detect simultaneously or substantially simultaneously a ray bundle from a picture element of a picture, and the output of the signal composing circuit being (a) the output of the high sensitive detection system when the received light quantity is smaller than a threshold light quantity which can be detected with substantially the same degree of accuracy by both the detection systems or (b) the sum of (i) the output of the low sensitive detection system and (ii) the difference between the outputs of the detection systems at the threshold light quantity whereby a time-serial output of wide dynamic range is obtained.