Light source device for laser beam printer
US6711198B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2000 |
| Grant date | Mar 23, 2004 |
| Priority date | — |
| Expiry date | Apr 14, 2020 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01S5/2219
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A light source device for a laser beam printer in which a semiconductor laser is driven with a pulse current having a minimum pulse width at the ON time on the order of milliseconds or less is provided, wherein the semiconductor laser is formed so that either the rate of change at the rise portion of the pulse current becomes ±8% or less or the semiconductor laser is excited in a multiple mode in the vicinity of the threshold value of the oscillation, and the semiconductor laser oscillates in a single mode at a current separated from the threshold value, by adjusting of at least one of the width w of a stripe groove (7a) of the current block layer, the composition of clad layers (5), the distance d between the current block layer (7) and the active layer (4), the composition of the current block layer (7) and the formation of a light absorption layer into the current block layer (7). As a consequence, in the case where the light source device for the laser beam printer is driven with a short drive pulse on the order of several hundred micro seconds, the light source device becomes such that a transient phenomenon is not generated at the time of the rise of the pulse and a st…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.