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. 08, 1998
Filed:
Apr. 19, 1996
Atsushi Yokoyama, Kanagawa, JP;
Takayuki Yoshigahara, Tokyo, JP;
Sony Corporation, , JP;
Abstract
Two photodiodes are disposed side by side in the direction in which the slit light reflected from the object to be measured moves. One photodiode 1 of the two photodiodes receives the reflected slit light for a longer period than the other photodiode 2. When neither of the two photodiodes receive the slit light reflected from the object to be measured but both receive the same bias light, even if very weak noise light is incident from the outside or the characteristics of the photodiodes slightly differ, a higher light current flows through the photodiode 1 than through the photodiode 2, making the output of the clock-type comparator 7 stable in the initial state. This allows distance measurement to be always performed stably.