JPS6035379A - Information storage device - Google Patents

Abstract

PURPOSE:To perform accurate address setting by generating a prescribed position signal for determining the recording or readout position of a head, and initializing a recording position setting means with said prescribed position signal. CONSTITUTION:When an electric power source is turned on, a sequence controller 10 checks whether an HP signal is present (''H'') or not (''L'') so as to know which side of an HP detection position the head 3 is at, and moves the head 3 forward until the HP signal is ceased (step 3) when the HP signal is present. When the HP signal is absent, the head 3 is moved backward to the right side of the HP detection position to detect the present of HP, and moved forward. The falling edge of the HP signal obtained by said operation is used to reset an address counter 8. Further, this resetting operation is performed to output an HP inhibition signal from the controller 10 to a gate 12, and the address counter is inhibited from being reset thereafter.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a one-information storage device that is effective for setting an address position on one recording medium.

2. Description of the Related Art Conventionally, in a device for recording on or reading from a disk, a separate pregroove (address groove) is required, in which an address is determined to serve as an index of a recording or reading position.

However, in this case, a means of creating a pre-groove is required)
Note: The initial position for reading may be inaccurate.

Address setting in such a case is difficult for disks without pregrooves, especially magneto-optical disks that can be read and written.

The present invention eliminates the above drawbacks and performs accurate address setting. That is, an information storage having a recording medium, a head for recording or reading, a recording position setting means for determining a recording or reading position on the recording medium, and a predetermined position signal generating means for generating a predetermined position signal. The apparatus is characterized by comprising initial setting means for initializing the recording position setting means using the predetermined position signal.

Thereby, it is possible to correctly determine the recording/reading progress position from the predetermined initial position.

The present invention will be described in detail below with reference to the drawings.

FIG. 1 shows the configuration of an apparatus according to an embodiment of the present invention. 1 indicates optical information storage. Reference numeral 2 denotes an optical radar for performing magneto-optical conversion readout using irradiated laser light. The optical head 3 is equipped with a light source (not shown) using a semiconductor laser and an optical pickup for recording and reading information on the disk 2. The optical head is driven by a motor (not shown) and is configured to slide in the direction of the arrow in the figure for information access, and can freely move within the head movable range shown in the figure. 4 is a linear gauge that detects the position of the head t1 rod, and the tip of its movable part is connected to the head 6, and as the head moves, the movable part expands and contracts, and accordingly, one gauge per 1 μm is measured. pulse is output. Furthermore, this output pulse is a two-phase pulse with a phase shift of 90 degrees, and by detecting whether the phase of the other pulse is ahead or behind when one pulse is taken as a reference, the head 6 can be adjusted. 9 is a photointerrupter, which is used as a reference position detection element to take the correspondence between the head 6 and the count value of the counter 8 mentioned above. A light shielding plate 6 attached to the head 6 is placed at a position to shield the photointerrupter 5 from light when the head 6 moves to the outermost circumference of the recordable area.

However, when the head 6 performs a return operation (toward the right in the figure), even if the head 6 is stopped using the detection signal (hereinafter referred to as P signal) output from the photo interrogator 5, it will not be able to return to the specified position. (shown further to the right beyond) becomes even wider outward. Therefore, the length of the light shielding plate 6 is made long so that the photointerrupter 5 can be shielded from light even if the head 6 moves to the outermost part of the movable range. FIG. 2 shows the relationship between the positions of these heads and the HP signal. (+) indicates that the head 6 is on the left side of the HP detection position, and the I- (P signal state is '
(II) shows the state of the HP signal when the head 3 is on the right side of the HP detection position and performs 9 progressive movements. This is sand, the head is low (if it is on the right side of the P detection position, the HP signal is “H”, and if it is on the left side, it is “L”)
It is 11. In addition, when performing a sequential forwarding operation after passing through the HP detection position, there is always only one falling edge of the 1-IP signal. Therefore, since the printer can be reset, the address counting operation with high positional accuracy can be performed. The length of the light-shielding plate 6 is shorter than the appropriate length, the collision occurs, and - multiple falling edges of the IP signal occur.
Home position detection and address counter setting operations are not performed properly.

In FIG. 1, 7 is a circuit for determining the direction of movement of the head, and the direction is determined based on the 2-phase/4-axis output from the linear gauge 4.
It controls the P count or DOWN count operation. As described above, the direction is determined based on the phase relationship between the two-phase clock pulses. The address counter 8 performs an UP or DOWN counting operation according to instructions from the direction discrimination circuit 7, and uses one of the two-phase clocks (I Pu1se/1 μm) output from the linear gauge 4 as the count clock. ing. The count value of the address counter is outputted to the next stage comparison circuit 9 and sequence controller 10 to inform the current head position. The comparison circuit 9 compares the count value of the address counter 8 and the value of address data output from the sequence controller 10. This address data corresponds to an address determined from an external device. This external cedar! l! The device is, for example, an information output device, a keyboard, or the like.

The head motor driver 11 receives a coincidence signal from the comparison circuit 9 and turns on the head motor from the sequence controller 10.
The motor that drives the head roller is turned ON and OFF by the signal.
It performs FF control, and further controls the head feed speed during access and constant speed feed control of the head during recording based on a speed command signal from the sequence controller 10. The sequence controller 10 manages the access operation of the head 2, and includes a memory having a program consisting of an operation flow during recording as shown in FIG. 6, and a microprocessor 7 for processing the program.

1. When the voltage Vθ is input, the sequence controller 10 detects the presence of the HPP signal # (HPP signal “H”) in order to know which side of the HP detection position the head 3 is on.
11LII's Togi is absent) (step 1). If there is an HP signal, the head 5 is on the right side of the HP detection position, so one head 6 is moved in the forward direction (step 3) until the HP is exhausted (step 2).
). When there is no I-I P signal, the I-(P detection position is to the left of the A sequence of detecting 8B of -IP (step 5) and then moving it in the forward direction (step 2) is performed.As a result, an HPP signal as shown in Fig. 2 is obtained. Using the falling edge of the HPP signal obtained by this operation, the address counter 8 is reset (step 6).Furthermore, when this reset operation 4 is performed, the sequence controller 10 sends an HP prohibition signal to 12. is output (step 7), and subsequent reset of the address counter is prohibited. That is, the counter is reset only once when power is input, and the HP prohibition signal controls the HPP signal input. This eliminates the occurrence of errors in the correspondence between the count value of the address counter and the head position, which would be caused by the address counter 8 being reset each time the head 6 passes the HP detection position. When the above processing is completed, the movement of head A is stopped (step 8). The above is the operation sequence at the time of startup of the present device, and after this process is completed, the device enters a state of waiting for an access instruction to be input from the external device 16 (step 9). If an address instruction is input, the sequence controller 10 sets address data in the comparator circuit 9 in order to move the head 5 to the position corresponding to the instructed address (step 10).

Furthermore, in step 1, it is necessary to determine whether the currently stopped position of the head 50 is before or after the address specified by the external device.
'I), accordingly instructs the head motor driver 11 to rotate the motor forward and backward, and at the same time sends a motor rotation start signal (head motor ON) (step 12);
(Step 16).

Upon receiving the rotation start signal, the head 6 moves at the access speed (several ten times faster than the recording/reading speed) determined by the speed command signal from the sequence controller 10.
;] and stops when the address data from the comparison circuit 9 and the address counter match signal (step 14)
, (Step 15).

(Step 16). At this time, the position where the coincidence signal is output becomes the predetermined address specified by the external device. In this state, the head 6 is stopped and is waiting for a command to start recording data to be input from the external device 16 (step 17). When data recording is started, the head 6 starts moving at the data recording speed determined by the speed command signal from the sequence controller 10 (step 18), (step 19). When receiving an instruction to end data from the external device 16 (step 20), recording is ended and the head 3 is stopped (step 2'1). Then, it waits again for an access instruction from the external device. The above is the recording sequence.

What has been described above can be applied not only to discs without pregrooves, but also to discs with pregrooves and discs with physical grooves, and the same method can be used not only for recording but also for reading.

[Brief explanation of the drawing]

FIG. 1 is a control circuit diagram of the information storage device of the present invention, FIG. 2 is a flowchart of the HP signal li\, spout, and FIG. 3 is a flowchart of the sequence controller in FIG. 1, and 2+!
In the figure, 1 is an information storage device, 2 is a magneto-optical disk, 6 is an optical head, 4 is a linear gauge, 5 is a photo ink clubter, and 6 is a light shielding plate. Agent Gizo Marushima, -11

Claims (1)

[Claims] (1) a recording medium and a recording or reading head;
In an information storage device having a recording position setting means for determining a recording or reading position on the recording medium and a predetermined position signal generating means for generating a predetermined position signal, the predetermined position signal initializes the recording position setting means. An information storage device characterized by having initial setting means for performing settings. (2> The information storage device according to item 1, wherein the initial setting means performs initial setting when the device is started.