Laser diode operated in amplitude modulation and pulse amplitude modes
US5426452A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 17, 1993 |
| Grant date | Jun 20, 1995 |
| Priority date | — |
| Expiry date | May 17, 2013 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/06216
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A laser imaging apparatus includes a laser diode which is controlled to produce a laser beam the power of which varies linearly as a function of a digital image input signal. The laser beam is deflected by scanning optics to expose photosensitive media such as film. When the digital image input signal is in a first range of values to operate the laser diode in its linear region, the laser diode is controlled to operate in an amplitude modulation mode. When the digital image input signal is in a second, lower, range of values which would operate the laser diode in its non-linear operating region, the laser diode is controlled to operate in the linear region but in a pulse amplitude modulation mode.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.