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Laser drive circuit

A driving circuit and laser technology, applied in the direction of lasers, laser components, semiconductor lasers, etc., can solve the problem that the laser driving circuit cannot satisfy the driving frequency satisfactorily

Inactive Publication Date: 2008-05-28
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This impedance difference is not a problem at drive frequencies of about 10MHz, but is currently causing serious problems due to the increase to higher speeds of about 60MHz
Therefore, the laser driving circuit shown in Fig. 12 cannot satisfactorily meet the needs of higher driving frequency

Method used

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Experimental program
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no. 1 Embodiment approach

[0031] 1 is a circuit diagram of a configuration of a laser driving circuit supporting a printed circuit board of a semiconductor laser driving device according to a first embodiment of the present invention. In FIG. 1, the same reference numerals as in FIG. 12 denote the same parts.

[0032] In FIG. 1 , reference numeral 1 denotes a feedback capacitor, 2 denotes a main power transmission wire, 22 denotes a main GND wire, 4 denotes a first wire, and 5 denotes a second wire. The first wire 4 and the second wire 5 are connected in parallel at the branch point 3 of the main power transmission wire 2 . The common mode choke coil 14 is inserted between the first wire 4 and the second wire 5 . The first wire 4 is divided into a third wire 4a and a fourth wire 4b by the common mode choke coil 14 . The second conducting wire 5 is divided into a fifth conducting wire 5 a and a sixth conducting wire 5 b by the common mode choke coil 14 .

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PUM

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Abstract

A purpose of this invention is to suppress radiation noise while satisfying demands for higher speeds and higher image qualities of a semiconductor laser driving device in a laser beam printer or the like. A laser driving circuit includes a first wiring pattern and a second wiring pattern which are connected to a main wiring pattern, a first circuit which is connected to the first wiring pattern and has a semiconductor laser element (7) and a laser driving device for driving the semiconductor laser element, a second circuit which is connected to the second wiring pattern, has a compensation element and a compensation driving device, and compensates for noise in the first circuit, and a common mode choke coil which is connected to the first and second wiring patterns and selectively increases impedances to in-phase signal components in a signal flowing through the first wiring pattern and the first circuit and a signal flowing through the second wiring pattern and the second circuit.

Description

technical field [0001] The present invention relates to a laser driving circuit for a printed circuit board supporting a driving device of a semiconductor laser as a printing light source of an image forming apparatus. Background technique [0002] Currently, image forming apparatuses are required to have faster printing speed and higher image quality for printed images. For this purpose, semiconductor laser driving devices in laser beam printers and the like must increase the driving frequency of semiconductor laser elements and increase the number of semiconductor laser elements. [0003] Usually, the laser driving circuit is composed of semiconductor laser elements that constitute the light emitting circuit, laser driving semiconductor devices, wires connecting semiconductor laser elements and laser driving semiconductor devices, main power transmission wires, main GND (ground) wires, main power transmission wires and light emitting The wires of the circuit, the wires co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S5/068B41J2/44H05K1/02
Inventor 青木乔
Owner CANON KK