Laser driving circuit, laser driving method, projector apparatus and apparatus which uses laser light
US-9225928-B2 · Dec 29, 2015 · US
Semiconductor laser control device and image forming device
US8995486B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-8995486-B2 |
| Application number | US-88148210-A |
| Country | US |
| Kind code | B2 |
| Filing date | Sep 14, 2010 |
| Priority date | Sep 15, 2009 |
| Publication date | Mar 31, 2015 |
| Grant date | Mar 31, 2015 |
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Abstract
Official abstract text for this publication.
There provided is a semiconductor laser control device which including plural light sources that are configured with eight or more semiconductor laser elements, a one detecting section that detects a light power of the light sources, a light power control unit that compares a signal according to a light power detected by the detecting section with a control signal corresponding to a predetermined light power to control a current supplied to the light sources, and a voltage clamp circuit that functions as an overvoltage preventing means for the detecting section when turning on each of the light sources to perform light power control.
First claim
Opening claim text (preview).
What is claimed is: 1. A semiconductor laser control device, comprising: a plurality of light sources that is configured with eight or more semiconductor laser elements; a detecting section including a photodiode that detects a light power of the light sources; a light power control unit that compares a signal according to the light power detected by the detecting section with a control signal corresponding to a predetermined light power to control a current supplied to the li…
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- H01S5/0427Primary
Electricity · mapped topic
Electricity · mapped topic
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Frequently asked questions
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- What does patent US8995486B2 cover?
- There provided is a semiconductor laser control device which including plural light sources that are configured with eight or more semiconductor laser elements, a one detecting section that detects a light power of the light sources, a light power control unit that compares a signal according to a light power detected by the detecting section with a control signal corresponding to a predetermin…
- Who is the assignee on this patent?
- Omori Atsufumi, Ishida Masaaki, Ricoh Co Ltd
- What technology area does this patent fall under?
- Primary CPC classification H01S5/0427. Mapped technology areas include Electricity.
- When was this patent published?
- Publication date Tue Mar 31 2015 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 8 related publications on this page (citations in our corpus or others sharing the same primary CPC).