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:
Apr. 30, 2019
Filed:
Apr. 28, 2016
Topcon Corporation, Itabashi-ku, Tokyo, JP;
TOPCON CORPORATION, Itabashi-Ku, Tokyo, JP;
Abstract
Provided is a technology for suppressing variations in the waveform of a light emission pulse caused by various factors in a light-emitting device. A light-emitting device is provided with: a light sourcein which relaxation oscillation occurs immediately after energization; a light source drive circuitwhich includes a differentiation circuithaving a resistor and a capacitor connected in parallel, and in which a switching elementfor voltage application is connected in series with the differentiation circuit; a power supply circuit; a light-reception elementwhich detects pulsed light emitted from the light source; and a voltage control unitwhich controls an output voltage from the power supply circuitin correspondence with the waveform of the detected pulsed light.