JPS60182581A - Address signal recording method - Google Patents

Abstract

PURPOSE:To shorten a retrieval period of an object address without reduction in a recording area of a data signal in terms of optical disk by recording an address signal of recording information in a track shape. CONSTITUTION:Address signals ADN-1, ADN, ADN+1... of track-shaped recording information of respective tracks TN-1, TN, TN+1... in an optical disk are recorded so that they will be sequentially located backward from a retrieval reference position viewed from the retrieval direction. As a result, the signals ADN-1, ADN... exist in one track by one address and continuously detected. Consequently a retrieval period of target address can be shortened without reduction in a recording area of a data signal.

Description

DETAILED DESCRIPTION OF THE INVENTION (A) Field of Industrial Application The present invention relates to a method of recording address signals on a 1-rack, and is applicable to optical disks, floppy disks, and the like.

(Ll) Conventional technology In optical discs used in document file systems, etc., the method for recording address signals on recording trunks is the sixth method.
As shown in figures (a) and (b), an optical disc (20)
A method for recording an address signal (<21) at one location on one track on a diameter of an optical disc (20), and a method for recording an address signal (22) at multiple locations on one track on multiple diameters of an optical disc (20). There are five methods to do this. This is, for example, 1 Nikkei Electronics' No. 3130P105
~120 (1983, 3, 28).

Here, in the method shown in FIG. 6(a), the area for recording 5 data signals is maximized, but after detecting the address signal of a certain track, for example λ.

For example, there is a waiting time for one revolution of the optical disk until the address signal of an adjacent track is detected, which increases the time required to search for the target address.

On the other hand, in the method shown in FIG. 6(b), the optical loss is 1
Since the address signal can be detected every 78 rotations, the number of times the address signal is detected within a certain period of time increases, and the search time for the target address becomes shorter. However, as the address signal recording area increases, the data signal recording area decreases.

C) Object of the Invention An object of the present invention is to provide an address signal recording method for shortening target address detection time without reducing the data signal recording area on an optical disc.

(2) Structure of the Invention The present invention is a method of recording a recorded signal in a trunk shape on a recording medium and recording an address signal in each track, and each of the address signals is directed in the direction to be searched. It is characterized in that it is recorded so as to be located sequentially backward from the forward-)-C search reference position.

Embodiment FIG. 1 is a top view of essential parts of an optical disc according to an embodiment of the present invention.
-+~TNsuλ each address ADN-1~ADゎ.

takes address A D +i-+ as the reference position, then
The addresses ADN-1 to ADN are recorded sequentially at the rear. 2 have a constant time difference of the same polarity. In addition, each address A D N-1
~The nlj part of the ADH42 has a signal non-recording area G (hereinafter referred to as
(referred to as Ki-tsubu G) is formed.

So 1. The search for the target track is carried out from the center of the optical disc toward the outer circumferential edge by the pronk circuit shown in FIG.

The address of the target truck is set by the address setting section (1). Search section (2) consisting of optical big amplifier
- Moves from the inner trunk of the optical disk (5) over the diameter of the optical disk (5) and sequentially detects addresses. A comparison section (3) compares the value of the adreno setting 81 (1) and the value of the address detected by the search section (2), and outputs a control signal when the comparison results in a mismatch. By inputting the control signal, the drive section (4) moves the search section (2) by one track in the direction of the outer circumferential end.

Specifically, the target track is the (N+1)th track//T.
If it is N++, the address A D N-1 is set in the address setting section 1). Now, the search part (2) is
N-1) If it is located on l-rack T N-1, the search section (2) has detected the address A D N-1 of this track T +i-+, and the comparison section (3) detects a comparison mismatch and outputs a control signal. The drive section (4) receives the control signal and moves the search section (2) to the N1-th rack T+i. Here, address, ADN
(7) Q! The moving time of the keypad G located in the f section is configured to be equal to the moving time of the search section (2>), and therefore, after the detecting section (2> detects the address A D N-1, At the same time as the movement to the Nth address TN is completed, the address A is located immediately before the address AD+i.
D+i can be detected directly.

The search section 2) detects the address ADN, and the comparison section 3)
The control outputs the code again, and the drive unit (4) outputs the search unit (2
) to the (N+1>track T +i++).

In this case as well, as described above, the search unit (2> is located at address A D +i++ directly I]:i after movement, and detects this address A D N-1.

In this way, the (N+1)th h rack T N of the target track
When the address A D N4+ of i+ is detected, the search unit (
2) stops, and as the optical disk rotates, 71
The data signal following Vires ADN-1 will be reproduced.

As described above, in the present invention!・The rank Atlnis signals are recorded in the search order so that they are sequentially located at the search reference position, specifically, from the recording position of the first searched address. Therefore, the search unit The address signal of this trunk can be detected at the same time as it moves from one truck to an adjacent one-rack.

By the way, such an address signal can be recorded in advance in the above-mentioned arrangement, or in the same way as the data signal (1) S. Hereinafter, a method for simultaneously recording address signals and data signals will be explained with reference to FIGS. 3 to 5.

As shown in FIG. 3, the signal recording format on the optical disc is such that a data signal recording area (DE) is located behind an address recording area (ADE). It is assumed that data is recorded in a spiral form from the inside of the optical disc.

In FIG. 4, the address management section (10) stores the final address of the recorded signal. The address detection unit (11) detects the recorded address, and the contents of the address management unit (10) and the address detection unit (11>) are compared in the comparison unit (12). . The comparison unit (12) outputs a belief υ by detecting a comparison match. The pulse generating circuit (13) manually generates the signal 4 and outputs a pulse P+ having a time width slightly longer than the time required for one revolution of the optical pulse. The recording management pulse circuit (14) detects the falling edge of the pulse P1, and after this detection, pulse P2 of a certain length, which has a time width required to record a signal with a recording fucomant (not shown in FIG. 3), is outputted. Occurs intermittently with time intervals. This pulse P2
By applying a recording control signal indicating that the signal can be recorded to the AND game 1115>, and controlling the switch circuit (16) on/off by the output of the AND game 1-<15). , the recorded signal is recorded on the optical disk (17).

Specifically, it is assumed that a signal is currently recorded on the first track T1 of the optical disc (see FIG. 1). Address management 81<<10) stores the address A D + of the first track T+. Address detection section (11)
When detects the address A D + , the comparator 12)
outputs comparison match A8. Pulse generation circuit <13>
As shown in FIG. 5, it rises in synchronization with the trailing edge of the address A Outputs pulse P1.

In synchronization with the falling edge of this pulse P, the C recording management pulse circuit (14) outputs the pulse P2 having a time t2. When the recording control signal is output here, the AND gate (15) turns on the switch circuit (16), and the recorded signal consisting of address AD2 and data is recorded on the second track T2 of the optical disc (17). Ru. Pulse P2
has an interval time is and is generated intermittently, and while the recording control signal is being output, the signal is recorded in synchronization with pulse P2. The interval time t3 is
This is for forming the gap G shown in Figure vJJ1.

(F) Effects of the Invention According to the present invention, the address signal recorded on each track is in one place, and the address signal of each track can be continuously recorded without reducing the data signal recording area on the optical disc and without waiting time. Since the target address can be detected in a consistent manner, the search time for the target address can be shortened.

[Brief explanation of the drawing]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a top view schematically showing the main parts of an optical disk, FIG. 2 is an address detection block circuit diagram, and FIG. 3 is a block diagram of an optical disc. FIG. 4 is a block diagram of the address signal recording circuit, and FIG. 5 is a timing chart. Figures 6 (a) and (b) are schematic diagrams for explaining conventional optical discs.

Claims (1)

[Claims] (1) A method in which the recorded signal is recorded on a recording medium in the form of a trunk, and an address signal is recorded on each track.)
71. A 71-response signal recording method, characterized in that each of the address signals is recorded sequentially backward from the search reference position in the search direction.