JPH1166745A - Optical track servo type magnetic recording method and device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To write a digital signal on a recording medium with a prescribed interval with a simple constitution by generating a clock signal becoming a reference from the optical continuous signal of the recording medium. SOLUTION: When a recording medium 1 having an optical track servo pattern is rotating driven, a servo signal being on the recording medium 1 is detected by an optical pickup 3 to be inputted to a PLL circuit consisting of a phase/frequency comparator circuit 6, a voltage controlled oscillator VCO 7 and a frequency divider circuit 8 via a comparator 5. In the PLL circuit 5, the clock synchronized with the servo signal is gernerated to be supplied to an encoding circuit 9 as a reference clock at the time of a write. The encoding circuit 9 encodes recording information from a CPU 10 based on the generated reference clock and amplifies them with a write amplifier 11 to write them on the recording medium 1 via a magnetic head 12. Thus, a digital signal corresponding to the recording signal synchronized with the servo signal detected by the optical pickup 3 can be recorded in the recording medium.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for magnetically recording digital signals on a recording medium.

[0002]

2. Description of the Related Art When recording a digital signal on a recording medium,
It is necessary to manage the relative speed between the recording medium and the head of the recording device. For example, as described in Japanese Patent Application Laid-Open No. 63-2167, a technique is known in which the rotation speed of a motor is controlled so that the linear velocity is constant at the inner and outer circumferences of a disk-shaped recording medium.

[0003]

However, in order to precisely control the relative speed between the recording medium and the head of the recording apparatus by controlling the rotation speed of the motor as described above, a driving mechanism and a driving control are required. The circuit has a complicated structure, which leads to disadvantages such as an increase in complexity of the entire recording apparatus and an increase in cost.

Therefore, the present invention provides a simple configuration.
It is an object of the present invention to provide an optical track servo type magnetic recording method and apparatus that eliminate the need to precisely control the relative speed between a recording medium and a head of a recording apparatus.

[0005]

According to the optical track servo type magnetic recording method of the present invention, when a digital signal corresponding to recording information is recorded on a recording medium, a reference clock signal is engraved on the recording medium. It is characterized by being generated from an optical continuous signal.

According to such a recording method, there is no need to precisely control the relative speed between the recording medium and the head of the recording apparatus by using a complicated drive mechanism and a drive control circuit. Can be provided.

That is, an optical track servo type magnetic recording apparatus according to the present invention comprises: detecting means for detecting continuous optical track servo information on a recording medium; means for generating a clock signal synchronized with the output of the detecting means; The system includes means for encoding recording information using a clock signal as a reference clock, and means for writing the encoded recording information to a recording medium.

[0008]

Embodiments of the present invention will be described below with reference to FIG. In FIG. 1, reference numeral 1 denotes a recording medium having optical track servo pattern information, which has optical grooves intermittently provided at predetermined track intervals. Reference numeral 2 denotes a spindle motor for rotationally driving the recording medium, which rotationally drives the recording medium 1 at a predetermined rotational speed. Reference numeral 3 denotes an optical pickup as a detecting means for detecting optical track servo pattern information on a recording medium,
It is composed of a laser, a lens, a photo detector and the like.
The servo signal detected by the optical pickup 3 is mainly used for track position control by the magnetic head position control circuit 4.

When the recording medium 1 is driven to rotate by the spindle motor 2, a servo signal on the recording medium is detected by the optical pickup 3. This servo signal is sent to the phase / frequency comparison circuit 6 via the comparator 5 and the VCO
7 is input to a PLL circuit composed of a frequency dividing circuit 8. By this PLL circuit, a clock synchronized with the servo signal detected by the optical pickup 3 is generated and supplied to the encoding circuit 9 as a reference clock at the time of writing.

The encoding circuit 9 encodes the recording information provided from the CPU 10 based on the reference clock, and supplies the encoded recording information to the write amplifier 11.
The recording information amplified by the write amplifier 11 is
2 is written to the recording medium 1. Therefore,
A digital signal corresponding to recording information synchronized with the servo signal detected by the optical pickup 3 is transmitted to the magnetic head 12.
Is written to the recording medium 1.

According to the above configuration, for example, when the rotation speed of the spindle motor 2 is lower than a predetermined rotation speed, the detection signal of the optical pickup 3 and the reference clock to the encoding circuit 9 are also delayed, and as a result, In addition, the writing speed to the recording medium also decreases. Conversely, when the rotation speed of the spindle motor 2 is higher than the predetermined rotation speed, the writing speed on the recording medium increases.

As described above, the writing speed changes in accordance with the change in the rotation speed of the recording medium. Therefore, a digital signal corresponding to recording information is transmitted to the recording medium at predetermined intervals without performing precise drive control of the spindle motor 2 for controlling the relative speed between the recording medium 1 and the magnetic head 12 at a predetermined speed. Can be written.

[0013]

As described above, according to the magnetic recording method and apparatus of the present invention, digital signals can be written to a recording medium at predetermined intervals without having a complicated drive mechanism and drive control circuit. It is possible to provide an inexpensive and simple magnetic recording device.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a circuit configuration of an optical track servo type magnetic signal recording apparatus according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Recording medium 2 Spindle motor 3 Optical pickup 4 Magnetic head position control circuit 5 Comparator 6 Phase / frequency comparison circuit 7 VCO 8 Divider circuit 9 Encoding circuit 10 CPU 11 Write amplifier 12 Magnetic head

Claims (2)

[Claims] When recording a digital signal corresponding to recording information on a recording medium, a clock signal is generated from detection information of an optical continuous signal engraved on the recording medium, and the recording information is recorded based on the clock signal. By encoding
A method for recording a magnetic signal, comprising: generating a drive signal for a recording head in synchronization with the clock signal. 2. A detecting means for detecting continuous optical track servo information on a recording medium, a means for generating a clock signal synchronized with an output of the detecting means, and encoding the recording information using the clock signal as a reference clock. And an optical track servo type magnetic recording apparatus comprising: means for writing the encoded recording information onto a recording medium.