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Speed multiplying reducing writing control method for CD read writer

A control method and technology of a burner, which are applied in optical recording/reproducing/erasing methods, recording/reproducing with optical methods, optical recording heads, etc. failure, etc.

Inactive Publication Date: 2005-09-28
LITE ON IT
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AI Technical Summary

Problems solved by technology

Existing optical disc drives operate at a high constant angular velocity. When the output power of the laser diode reaches its maximum value (Pmax), the optical disc drive must maintain this high constant angular velocity, as shown in Figure 1(B)I curve As shown, the output of the laser diode is higher than the maximum output power to continue burning the disc, which will lead to a reduction in the life of the laser diode
Or as shown in the curve of Figure 1(B)(II), the output power of the laser diode is only maintained at the maximum output power, which will result in poor recording quality of the optical disc when the recording is completed, and even worse, it will cause recording fail

Method used

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  • Speed multiplying reducing writing control method for CD read writer
  • Speed multiplying reducing writing control method for CD read writer
  • Speed multiplying reducing writing control method for CD read writer

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Embodiment Construction

[0017] Please refer to FIG. 2(A), which shows the relationship between the linear velocity of the recordable optical disc drive and the radius of the optical disc according to the first embodiment of the present invention. FIG. 2(B) shows the relationship between the output power of the laser diode and the radius of the optical disc in the recordable optical disc drive according to the first embodiment of the present invention. First, set the optical disc drive to rotate at a first constant angular speed (RPM1). At this time, the output power of the laser diode will vary with the burning position on the optical disc, that is, the closer to the outer line of the optical disc The greater the speed, the greater the output power of the laser diode. Assume that when the spot formed by the laser beam is r1 away from the center of the optical disc, when the output power of the laser diode reaches a maximum value Pmax, the burning operation is suspended.

[0018] Next, the rotational ...

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Abstract

A method for controlling reduction of multiplication speed in photoetching decreases photoetching speed or master shaft rotation speed to ensure laser diode output power not exceeding preset power for assuring quality of photoetching for optical disc and prolonging lifetime of laser diode when laser diode output power reaches at a preset power in photoetching process.

Description

technical field [0001] The present invention relates to a down-speed burning control method of an optical disc burner that ensures the burning quality, and in particular relates to dynamically changing the burning speed of the optical disc drive or the rotational speed of the spindle motor according to the output power of the laser diode. To ensure the burning quality and prolong the life of the laser diode. Background technique [0002] Due to the rapid development of computer technology, the burning speed of recordable optical disc drives is getting faster and faster. Generally speaking, a fixed relationship must be maintained between the output power of the laser diode (Output Power) and the linear velocity (LinearVelocity). That is to say, when the programming speed is faster, the required output power of the laser diode is larger. [0003] Please refer to Figure 1(A), which shows the relationship between the linear velocity and the radius of the disc when the recordab...

Claims

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Application Information

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IPC IPC(8): G11B7/0045G11B7/1263
Inventor 洪建豊
Owner LITE ON IT
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