Laser diode supply circuit
US5199039A · kind A · utility
4Cited by
5References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 22, 1991 |
| Grant date | Mar 30, 1993 |
| Priority date | — |
| Expiry date | Jul 22, 2011 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/0683
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A voltage source is connected to a laser diode via a supply circuit and a control circuit serving to control current through the laser diode. The control circuit includes a transistor which is switched into conduction on the application of a threshold valued voltage. A light sensitive diode is optically coupled to the laser diode and is adapted to apply a control voltage to the transistor switch which is related to the optical power output of the laser diode, such that when the control voltage exceeds a predetermined threshold value, the transistor is rendered conductive to control current through the laser diode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.