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:
May. 03, 1994
Filed:
Feb. 25, 1993
Toshio Kasai, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A laser driving circuit is provided for driving a laser diode, in which the intensity of the laser beam emitted by the laser diode depends upon the amount of electrical current flowing through the laser diode. The laser driving circuit includes a current source for generating an electrical current to flow through the laser diode, the electrical current being varied in accordance with the voltage applied to the current source. In the laser driving circuit, voltage is applied to the current source in accordance with the intensity of the laser beam emitted by the laser diode. A variable resistor member is further provided for varying the voltage applied to the current source and at least one fixed resistor member is selectively connected in parallel with the variable resistor member for dividing the voltage, varied by the variable resistor member, at a predetermined ratio.