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:
Feb. 14, 2017
Filed:
Feb. 24, 2016
Optoelectronics Co., Ltd., Warabi-shi, Saitama, JP;
Mitsuaki Hirono, Warabi, JP;
Naoya Niizeki, Warabi, JP;
Masaki Kurokawa, Warabi, JP;
Jun Higa, Warabi, JP;
OPTOELECTRONICS CO., LTD., Warabi-shi, JP;
Abstract
In an optical information reader controlled by this controller, a laser beam originating in light emitted by a laser diode is reflected by a scan mirror to scan optical information of a bar code or the like, reflected light therefrom is received by a photodiode to be converted to an electrical signal, and the optical information is read by processing the signal. In the controller, a main amp having a characteristic that a gain changes according to a frequency of an input signal amplifies the electrical signal, a detector detects an analog signal resulting from the amplification, and from a. detection output thereof, a MPU (on/off frequency control circuit) detects level of the analog signal and adjusts the gain of the main amp by changing an on/off frequency of the laser diode caused by an APC circuit (light emission on/off circuit), according to the detected level.