JPS61237232A - Optical information device - Google Patents

Abstract

PURPOSE:To increase the recording capacity of an information recording medium by making the writing speed slower inside a specific track on a discoid recording medium than outside and recording information which is low in frequency of utilization. CONSTITUTION:A control part 31 reads the position of a head part 17 and its address out of a head control part 19 according to an address specified with an address signal 4 which is supplied externally and then judges the area of the address. If an instruction is so sent out to a clock generator 27 that the clock frequency in writing is (f) when the address is between a1 and a2 or f/2 when between a2 and a3. Then, an information processing signal 43 is passed through a signal processing part 23 and modulated by a signal modulation part 25 and then recorded on an optical information recording body 11 through a head part 17. The current signal recording speed is selected between (f) and (f/2) according to the address inputted to the control part 31. When the address is between a2 and a3, information which is low in frequency of utilization is recorded and the recording area is expanded.

Description

[Detailed description of the invention] 〔Technical field〕 The present invention relates to an optical information device.

Note that in this specification, an apparatus having one or both of the functions of recording information on an optical information recording medium and reproducing information recorded on the medium is referred to as an optical information apparatus.

[Prior art]

Conventionally, C, A, V (constant angu
In optical information devices using the lar velocity (constant angular velocity rotation) method, the medium usually has a number of +
It is divided into sectors, and address information such as a track address and sector address and a synchronization signal are preformatted at the beginning of each sector. The recording area of the medium is determined by the beam spot diameter of the laser beam during reading and writing, the number of bits per sector, and the like. When attempting to record information inside the innermost track, which is the recording section of the information recording area, the bit interval (interval from the center of one bit to the center position of the next bit) is narrower than the beam spot diameter of the laser beam. Therefore, sufficient resolution cannot be obtained, and therefore information cannot be recorded in this portion, resulting in a problem that the recording information density per medium unit cannot be increased.

[Purpose of the invention]

The present invention has been made in view of the above-mentioned problems, and it is an object of the present invention to provide an optical information device in which the recording capacity of an information recording medium is increased.

In order to achieve such an object, the present invention adopts a configuration in which the recording speed is reduced inside a predetermined track on a recording medium.

〔Example〕

The present invention will be described in detail below based on embodiments shown in the drawings.

In FIG. 1 which shows an embodiment of the present invention, 11 is a disk-shaped optical information recording medium such as an optical disk or magneto-optical disk that can optically record and reproduce information, and 13 is this optical information recording medium. A spindle motor that rotationally drives the medium 11; 15, a spindle control section that controls the spindle motor 13; 17, a head section for recording and reproducing information on the optical information recording medium 11; 19, controlling the operation of the head section 17; 21 is a signal demodulation unit that demodulates the read signal from the head unit 17; 23 is a signal processing unit that performs various signal processing; 25 is a signal processing unit that modulates the signal from the signal processing unit 23 and outputs the signal to the head unit 17; 27 is a clock generator that generates a clock used for signal demodulation and modulation; 29 is an AF and AT control unit necessary for tracking of the head unit 17; and 31 is in charge of the entire device. This is the control section.

FIG. 2 shows the operating range of the do section 17 with respect to the optical information recording medium 11 shown in FIG.

FIG. 3 shows the state of sectors on the optical information recording medium 11.

Further, FIG. 4 shows the flow of information recording operation in the apparatus of the present invention.

Hereinafter, an example of the operation of the apparatus to which the present invention is applied will be explained with reference to FIGS. 1 to 4.

First, let us look at the operation of recording information on the optical information recording medium 11. The control section 31 reads the position of the head section 17 and its address from the spatula' control section 19 according to the specified address by the address signal 41 given from the outside (step 6).
1) Determine whether the address is within the part from al to al in FIG. 2 or within the part from al to a3 (step 62). If the address is from al to al
If the address is within the part, the clock frequency at the time of writing is f (step 63), and if the address is within the part a2 to a3, the clock frequency is f/2 (step 63).
Step 64) Issue a command to the clock generator 27 Next, the head unit 17 reads an address previously recorded on the optical information recording medium 11 (Step 65), and sends a signal to the signal demodulation unit 21. The signal demodulated according to the command from the control unit 31 is sent to the control unit 31 via the signal processing unit 23.
and the address will be verified. Thereafter, the information processing signal (information to be recorded) 43 passes through the signal processing section 23, is modulated by the signal modulation section 25, and is then recorded on the optical information recording medium 11 via the head section 17 (step 66)
, the signal recording speed on the optical information recording medium ti at this time is
This is determined based on the address input to the control unit 31, and corresponds to the clock frequency f or f/2 from the clock generator 27.

By the way, the inner peripheral part of a2 to a3 (recording and playback speed = f/2
Since information access time is slower in the area (section) compared to the outer circumference of a1 to a2, information data that is frequently used (search frequency) is not recorded in the inner circumference of a2 to a3. It is effective to record data with little information or data that requires slow access time.

Furthermore, when reading and reproducing information from the optical information recording medium 11 recorded in areas a2 to a3 as described above, if the reproduction designated address is a2 to a3, the clock frequency of the clock generator 27 is Change to f/2. By doing so, the recorded information on the inner circumferential portion can also be reproduced without any problem.

With this configuration, it is now possible to record on the inner peripheral portion of the recording medium (range from aZ to a3), which was conventionally impossible, by changing the information recording and reproduction speeds. In other words, the information storage capacity of the recording medium is increased without changing the laser spot diameter.

Note that in the above embodiment, the clock frequency for recording and reproducing to the inner circumferential portion is used as f/2, but the clock frequency is not limited to this, and a different frequency may be used. By changing this, the storage capacity can be increased without changing the amount of storage information per sector.

〔Effect of the invention〕

As described in detail above, according to the present invention, it is possible to realize an optical information device that can increase the information storage capacity of an information recording medium.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of an optical information device according to an embodiment of the present invention, FIG. 2 is an explanatory diagram of the operating range of the head with respect to an optical information recording medium in the device of the present invention, and FIG. 3 is an optical information recording FIG. 4 is a plan view showing the state of sectors on the medium, and is a flowchart showing the recording operation in the apparatus of the present invention shown in FIG. 11... Optical information recording medium 13... Spindle motor 17... Head section 19... Head control section 21... Signal demodulation Section 23... Signal processing section 25... Signal modulation section 27... Clock generator 31...
・Control unit Fig. 2 Fig. 3 Fig. 4

Claims (1)

[Claims] 1) In an optical information device that optically records information on a disc-shaped recording medium, the information writing speed is slower inside a predetermined track of the disc-shaped recording medium than outside a predetermined track. An optical information device characterized by: 2) The optical information device according to claim 1, wherein the disk-shaped recording medium rotates at a constant angular velocity. 3) An optical information device according to claim 1, characterized in that information that is used less frequently is recorded inside a predetermined track.