| US 7,586,965 B2 | ||
| Laser drive device and image forming apparatus incorporating the same | ||
| Masaaki Moriya, Moriya (Japan) | ||
| Assigned to Canon Kabushiki Kaisha, Tokyo (Japan) | ||
| Filed on Sep. 27, 2007, as Appl. No. 11/862,383. | ||
| Application 11/862383 is a continuation of application No. 11/250126, filed on Oct. 13, 2005, granted, now 7,308,010. | ||
| Claims priority of application No. 2004-299073 (JP), filed on Oct. 13, 2004. | ||
| Prior Publication US 2008/0013578 A1, Jan. 17, 2008 | ||
| Int. Cl. H01S 3/00 (2006.01) | ||
| U.S. Cl. 372—38.02 [372/38.1; 372/38.01; 372/38.03; 372/38.07] | 5 Claims |
| 1. A laser drive device that controls an amount of light emitted from a laser beam-emitting device that emits a laser beam
based on image data, comprising:
a detecting device that detects the amount of light emitted from the laser-beam emitting device;
an integrated circuit having a generator device adapted to generate a modulation signal based on the image data, a current
control device adapted to control a driving current supplied to the laser beam-emitting device, a first group of ports connected
to the current device, and a second group of ports different from the first group of ports; and
a first group of resistors, different in resistance value from one another, connected to the first group of ports of the integrated
circuit, respectively,
wherein the current control device is adapted to supply the driving current to the laser beam-emitting device any of the first
group of ports based on the detection results of the detection device, and
wherein the current control device is adapted to supply the driving current to the laser beam-emitting device via any one
of the second group of ports in response to a temperature around the laser beam-emitting device.
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