JPH0489630A - Optical disk device - Google Patents

Abstract

PURPOSE:To satisfactorily make the most of performance of a recording medium to be used by controlling 1st and 2nd clock generating circuits based on a discriminating result of a medium discriminating sensor. CONSTITUTION:The operation clock for a read/write circuit (R/W circuit) 3 of the optical disk device and the number of revolutions of a spindle motor are variable. Then, when a medium 5 is set on the spindle motor 9, the kind of the recording medium 5 is known by a CPU 1 with the medium discriminating sensor 10. Then, the number of revolutions and the operation clock of the R/W circuit at the time of writing data with the max. power in various kinds of recording media, performed in advance and written in a ROM, etc., are read out, and they are set to the clock generating circuit (A) 2 and the clock generating circuit (B) 7 respectively. By this method, even when any recording medium is used, the data is written at its max. speed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a read/write circuit (hereinafter referred to as R) of an optical disk device.
/W circuit) and a motor drive circuit.

[Conventional technology]

The operating speed (data transfer speed) of an R/W circuit used in an optical disk device is primarily limited by data writing characteristics. This is because the recording medium uses laser light as a thermal energy key, so if the data writing speed increases, sufficient heating cannot be achieved.

On the other hand, current optical disk devices use several types of recording media in the same device. However, there are large differences in characteristics between recording media, and the maximum and minimum laser beam power required for writing under the same conditions may differ by as much as twice.

Therefore, in order to be able to use any recording medium as an optical disk device, we use a recording medium that has the minimum write characteristics, that is, a recording medium that requires writing at the maximum power, and the speed that can be written to that recording medium. The clock frequency for writing is determined based on this. Therefore, when using other recording media, data is written by lowering the power of the laser beam.

[Problem to be solved by the invention]

In this conventional optical disk device, data is written at the same timing from the recording medium with the lowest writing characteristics to the recording medium with the best characteristics, so the best recording medium is inherently capable of high-speed writing. Despite its existence, it had the drawback of not being able to take full advantage of its performance.

[Means to solve the problem]

The present invention provides first and second clock generation circuits that respectively send variable frequency clocks, a read/write circuit that records and reproduces data in synchronization with the clock of the first clock generation circuit, and a motor drive circuit that drives a spindle motor in synchronization with the clock of the second clock generation circuit; a recording medium rotated by the spindle motor; a medium identification sensor that identifies the type of the recording medium; and identification of the medium identification sensor. It is composed of a CPU that controls the first and second clock generation circuits based on the results.

〔Example〕

Next, the present invention will be explained with reference to the drawings.

FIG. 1 is a block diagram showing one embodiment of the present invention. In FIG. 1, a clock generation circuit (A) 2 is controlled by a CPU 1 to change the frequency of an output clock. R
/W circuit 3 inputs the clock from clock generation circuit (A) 2 to write and read data. The head 4 records data from the R/W circuit 3 on a recording medium 5, or reproduces data on the recording medium 5 and sends it to the R/W circuit 3. The carriage 6 is operated by a VCM motor (not shown) to move the head 4 on the recording medium 5 to a predetermined track position. In addition, the clock generation circuit (B) 7 is a CPU
1 and changes the frequency of the output clock. The motor drive circuit 8 drives the spindle motor 9 in synchronization with the output clock of the clock generation circuit (B) 7 to rotate the recording medium 5. Medium identification sensor] 0 identifies the type of the installed recording medium 5 and
Let me know. In this embodiment, an identification hole is provided in the case of the recording medium 5, and the hole is optically read.

Next, the operation of this embodiment will be explained.

When the medium 5 is transferred to the spindle motor 9, the CPUI learns the type of the recording medium 5 through the medium identification sensor 10. Then, the CPU 1 determines in advance the rotational speed and R when data is written at the maximum power on each type of recording medium.
The operating clock of the /W circuit written in the ROM etc. is read out, and the respective clock generation circuits (A) 2
and settings for the clock generation circuit (B) 7. Thereby, data can be written at maximum speed no matter what kind of recording medium is used.

〔Effect of the invention〕

As explained above, in the present invention, since the operating clock of the R/W circuit and the rotation of the spindle motor are varied, it is possible to perform R/W at maximum power and speed on any recording medium.
/W circuit can be operated, and the performance of the recording medium used can be fully utilized.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing one embodiment of the present invention. 1...CPU, 2...Clock generation circuit (A), 3
... R/W circuit, 4... Head, 5... Recording medium, 6... Carriage, 7... Clock generation circuit (B
), 8... Motor drive circuit, 9... Spindle motor, 10... Medium identification sensor.

Claims (1)

[Claims] The first and second clocks each transmit a variable frequency clock.
a read/write circuit for recording and reproducing data in synchronization with the clock of the first clock generation circuit; and a motor for driving a spindle motor in synchronization with the clock of the second clock generation circuit. a drive circuit; a recording medium rotated by the spindle motor;
a medium identification sensor that identifies the type of recording medium; and a medium identification sensor that identifies the type of the recording medium;
1. An optical disc device comprising: a CPU that controls a clock generation circuit.