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:
Jun. 30, 1992
Filed:
Apr. 17, 1991
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A driving circuit of a semiconductor laser includes a photodiode receiving a light of the semiconductor laser, a first detecting circuit for calculating a mean value signal of outputs of the semiconductor laser in accordance with an output of the photodiode, a second detecting circuit for calculating a maximum value signal of the outputs of the semiconductor laser, a circuit receiving the mean value signal for supplying a bias current for driving the semiconductor laser, a high-frequency superimposing circuit for modulating the bias current by high-frequency waves, and a modulating degree control circuit comparing the mean value signal with the maximum value signal for making a period of time for which the minimum value of the optical output values of the semiconductor laser becomes zero, in accordance with the comparison results.