JPS6138537B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention records and reproduces a large amount of information by stacking a plurality of flexible magnetic disks with minute gaps between them.

2. Description of the Related Art In recent years, magnetic disk devices have been studied that record and reproduce large amounts of information by stacking a plurality of flexible magnetic disks with a certain minute gap between them. Since such magnetic disk devices are used as online mass storage devices for computers, a specific flexible magnetic disk for recording or reproducing information from at least a plurality of stacked flexible magnetic disks can be accessed in a short access time. The mechanism must have a form that allows accurate selection.

A mechanism for selecting a specific flexible magnetic disk from among a plurality of stacked flexible magnetic disks (hereinafter referred to as flexible disk stack) adopted in this type of magnetic disk device currently known. One example is the following disclosed in Japanese Patent Laid-Open No. 50-39430.

A photoelectric conversion device fixed on the base plate that detects the fluctuation of the end face of the flexible disk stack is used to separate the flexible magnetic disks at intervals of a fraction of the rotation time of the flexible disk stack. Check the positional alignment between the tip of the splitter and the end face of the specific flexible magnetic disk to be selected, and when both are aligned, insert the splitter into the gap between the layers of the flexible disk stack to open this gap. , followed by a mechanism for selecting the specific flexible magnetic disk by inserting a magnetic head into the opening.

By the way, with the conventional disk selection mechanism as described above, it has been extremely difficult to avoid the following drawbacks. In other words, the flexible disk stack takes 25 to 30 milliseconds for one rotation, and its outer peripheral edge has an amplitude several times the lamination gap of the flexible magnetic disk and a period of several to tens of milliseconds. If the splitter is moved toward the flexible disk stack after confirming that both the splitter tip and the specific flexible magnetic disk edge are aligned, the splitter tip may not be at the position of the disk edge. Since it takes several milliseconds to reach the location, by the time the location is reached, the matching relationship between the two positions has already collapsed, and therefore a particular flexible magnetic disk is often not selected accurately.

The purpose of the present invention is to eliminate the above-mentioned problems,
It is an object of the present invention to provide an inexpensive flexible magnetic disk device that satisfies the conditions for selecting the above-mentioned specific flexible magnetic disk.

According to the present invention, flexible disks are laminated in which flexible disks coated with a magnetic layer and having a color different from the base color of the normal flexible magnetic disks (hereinafter referred to as different-colored flexible disks) are inserted between normal flexible magnetic disks every few sheets. a photoelectric device capable of moving the body and at least the optical system to a desired position in accordance with commands from a control device, and detecting movement of an end face of the unique flexible disk; a splitter; and an actuator that constantly positions the splitter at the optimum location for selecting a particular flexible magnetic disk based on the detection signal of the photoelectric device.

In the flexible magnetic disk device of the present invention, when selecting a specific flexible magnetic disk,
Focusing on the experimental result that the motion of the end face of a stack of flexible disks is local, that is, almost the same in groups of several disks, first, based on the selection command containing the address of the specific flexible magnetic disk sent from the control device. move at least the optical system of the photoelectric device to a position where it can detect the movement of the end face of the unique flexible disk closest to the specific flexible magnetic disk to be selected, and then follow the instructions of the control device and the detection signal of the photoelectric device. select the specific flexible magnetic disk while making the splitter tip follow the fluctuation of the end face of the unique flexible disk with a sufficiently small phase delay by driving the actuator based on the position optimal for selecting the specific flexible disk; It works like that. Therefore, the flexible magnetic disk device of the present invention can select a specific flexible magnetic disk more accurately and in a shorter access time than conventional devices. Because of the above-mentioned configuration, the mechanical structure is not complicated compared to the conventional flexible magnetic disk device as described above, and it is also easy to process unique flexible disks and assemble flexible disk stacks. Since no special technology or process is required, the manufacturing cost of the device does not increase.

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

FIG. 1 is a diagram showing the structure of a first embodiment of the present invention, in which 10 is a flexible disk laminate, 10-
a is a normal flexible magnetic disk coated with a magnetic layer, 10-b is a blank flexible disk constructed from the base plate of the normal flexible magnetic disk 10-a, and 10-c is a normal flexible magnetic disk 10-a. The specific flexible magnetic disk to be selected, 12 is a photoelectric device for detecting the fluctuation of the end face of the blank flexible disk 10-b, 12-a is a step motor, and 12-b
12-c is a feed screw, 12-c is an optical system included in the photoelectric device, 12-d is an optical filter having the same color as the base color of the end face of the ordinary flexible magnetic disk 10-a, 12-e is an optical lens, 12- f is a one-dimensional photoelectric conversion device consisting of a one-dimensional array of charge coupled device (CCD) sensor chips; 12-g is a vibration detection circuit for the end face of the blank flexible disk 10-b included in the photoelectric device 12; 12-i is the running difference signal of the one-dimensional photoelectric conversion device 12-f generated from the oscillation detection circuit 12-g, 1
2-j is a vibration detection signal of the end face of the blank flexible disk 10-b generated from the one-dimensional photoelectric conversion device 12-f, and 12-k is a vibration detection circuit 12-g.
14 is a selection command containing the address of a specific flexible magnetic disk from a control device (not shown); 16 is a photoelectric device; Actuator control circuit, 16-a, photoelectric device drive unit, 16
-b is a control circuit for the actuator, 16-c is a drive signal for the step motor, 16-d is a drive signal for the actuator, 18 is a splitter, 20 is an actuator that moves the splitter to a desired position, and 22 is a drive signal that moves the splitter to a predetermined track. The track positioning actuator is shown moving up.

Next, the operating principle and effects of the first embodiment of the present invention will be explained in detail with reference to FIG.
Note that the vibration detection circuit 12-g and the control circuit 16 for the photoelectric device and actuator shown in FIG. 1 may be any known ones, and a detailed explanation thereof will be omitted since it is not related to the gist of the present invention.

When a selection command 14 for a specific flexible magnetic disk 10-c is sent from a control device (not shown) to the photoelectric device drive section 16-a, this drive section 16
-a drives the step motor 12-a to select a specific flexible magnetic disk 10-c, which is the closest flexible magnetic disk 10 whose surface has a normal color.
- Move the optical system 12-c to a position where it can detect the fluctuation of the end face of the raw flexible disk 10-b, which is different from that of the one in a. That is, the stop motor 12-a is driven by the drive signal 16-c of the step motor, and the feed screw 12-b is thereby rotated to set the reference position on the one-dimensional photoelectric conversion device 12-f included in the optical system 12-c. is made to coincide with the previously calculated position statistically assumed when the end face of the blank flexible disk 10-b rotates. When this operation is completed, the optical filter 12
-d and an optical lens 12-e, a real image of the end face of the blank flexible disk 10-b, which oscillates in the direction of arrow B, is formed on the one-dimensional photoelectric conversion device 12-f. By the way, the one-dimensional photoelectric conversion device 12-f uses the scanning signal 12-i generated by the vibration detection circuit 12-g to detect a time period t of about several tens of microseconds, which is sufficiently shorter than the rotation period time of the flexible disk stack 10. Therefore, the vibration detection signal 12 of the end face of the raw flexible disk 10-b is scanned at a sampling period of t.
- Outputs j. This end face vibration detection signal 12-
j is processed within the oscillation detection circuit and is applied from the oscillation detection circuit 12-g to the actuator control circuit 16-b at intervals of time t as a digital signal 12-k corresponding to the oscillation of the end face. The actuator control circuit 16-b is connected to a specific flexible magnetic disk 10 from a control device (not shown).
-c selection command 14 and digital signal 12-k corresponding to the vibration of the end face, the following operation is performed. Selection command 14 is actuator control circuit 1
6-b, the circuit 16-b first determines the relationship between the reference position on the one-dimensional photoelectric conversion device 12-f and the tip of the splitter 18, which is optimal for selecting a specific flexible magnetic disk 10-c. A distance H is calculated. By the way, even if the optical system 12-c is moved to a desired location as described above, the image of the end surface of the blank flexible disk 12-b formed on the one-dimensional photoelectric conversion device 12-f is a one-dimensional photoelectric conversion device 12-f due to reasons such as the end face fluctuating over time as shown by arrow B.
Does not match the reference position above. Therefore, the distance H
In parallel with the calculation of the actuator control circuit 16
-b, the amount of deviation between the position of the end face of the blank flexible disk 10-b and the reference position on the one-dimensional photoelectric conversion device 12-f is calculated using the digital signal 12-k corresponding to the fluctuation of the end face. be done.
When these two calculations are completed, the results are added together and sent to an electronic circuit that drives an actuator 20 consisting of a voice coil motor. This actuator drive circuit has an actuator drive signal 16.
-d is generated, the actuator 20 is driven,
The tip of the splitter 18 is positioned at a constant distance H from the end surface of the blank flexible disk 10-b, which is most preferable for selecting a specific flexible magnetic disk 10-c. That is, the tip of the splitter 18 moves in synchronization with the fluctuation of the end face of the blank flexible disk 10-b with a very small phase delay. When the above state occurs, the track positioning actuator 22 (not shown)
control circuit is driven, and the splitter 18 is moved in the radial direction of the flexible disk stack (in the direction of arrow A) by the track positioning actuator 22. As a result, the splitter 18 is moved between a specific flexible magnetic disk 10-c and this one. It is inserted into the gap S between the magnetic disk 10-c and the adjacent flexible magnetic disk. That is, a specific flexible magnetic disk 10-c is selected.

As is clear from the above detailed explanation of the operating principle of the first embodiment, the flexible magnetic disk device of the present invention provides the following new effects compared to conventional devices.

(1) Since the tip of the splitter 18 is always positioned at the optimal location to select the specific flexible magnetic disk 10-c, the specific flexible magnetic disk 10-c is selected, which is superior to conventional flexible magnetic disk devices. A specific flexible magnetic disk can be selected more accurately and quickly.

(2) The raw material of the ordinary flexible magnetic disk 10-a may be used as the raw material of the raw flexible magnetic disk 10-b, which serves as an index when selecting a specific flexible magnetic disk 10-c. There is no need to perform any special processing on the surface of the disk 10-b. For this reason, the manufacturing price of flexible magnetic disk devices will not be increased.

That is, this embodiment can sufficiently achieve the object of the present invention as described above.

FIG. 2 shows a part of a cross section including the outer peripheral end of a plating type flexible disk used as a uniquely colored flexible disk in a second embodiment of the present invention. In the figure, 24 is a plating type flexible disk, 24-a is a blank plate, and 24-b
indicates a matte layer. The plating type flexible disk 24 of this embodiment is used by being incorporated into the flexible disk laminate 10 instead of the blank flexible disk 10-b in the first embodiment. In other words, the flexible disk type 2
4 plays the same role as the blank flexible disk 10-b. Therefore, since the operating principle of the device in the second embodiment is the same as that in the first embodiment, its explanation will be omitted, but in addition to the first embodiment, it provides the following new effects. . That is, (1) Compared to the blank flexible disk 10-b in the first embodiment, it is necessary to perform a special process called plating on the surface in this embodiment, but on the other hand, since the plated surface has a high reflectance, The S/N ratio when detecting the vibration of the end face can be made much larger than in the first embodiment. Moreover, in many cases, the optical filter 12-d is unnecessary.

(2) The plating layer 24-b is a magnetic layer, and the optical system 12-c and the splitter 18 are arranged on different diameters so as not to cause physical interference, and the drive signal 16-d of the actuator is appropriately controlled. If the magnetic information is configured to be delayed, magnetic information can be recorded on the surface of the plating-type flexible disk 24, even though it cannot be handled in the same way as a normal flexible magnetic disk 10-a.

The operating principles, functions, and functions of the embodiments of the present invention have been described above.
Although the effects have been explained in detail, the basic attributes of the unique flexible disk of the present invention are that its outer peripheral edge is
Because the colors differ to such an extent that they can be detected photoelectrically, the uniquely colored flexible disk is not limited to the one described in the above embodiments, and also includes methods for detecting the movement of the end face of the uniquely colored flexible disk.
It is clear that various modifications may be made to the splitter position control system and the like without departing from the spirit of the present invention.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing a first embodiment of the present invention, and FIG.
The figure is a diagram showing a part of a cross section of a plating type flexible disk used in a second embodiment of the present invention. In the figure, 10...flexible disk laminate, 10-a...normal flexible magnetic disk, 10-b...blank flexible disk,
10-c...Specific flexible magnetic disk,
12...Photoelectric device, 12-a...Step motor, 12-b...Feed screw, 12-c...Optical system, 12-d...Optical filter, 12-e...
Optical lens, 12-f...one-dimensional photoelectric conversion device,
12-g... Shake detection circuit, 12-i... Scanning signal, 12-j... End face shake detection signal, 12-k
...Digital signal corresponding to the vibration of the end face, 14
... Selection command, 16 ... Control circuit for photoelectric device and actuator, 16-a ... Photoelectric device drive section, 16-b ... Control circuit for actuator, 1
6-c...Step motor drive signal, 16-d
...actuator drive signal, 18 ... splitter, 20 ... actuator, 22 ... track positioning actuator, 24 ... plating type flexible disk, 24-a ... blank plate, 24-
b...Indicates a plating layer.

Claims (1)

[Scope of Claims] 1. A flexible disk stack in which a different color flexible disk is inserted every few ordinary flexible magnetic disks, and at least an optical system is moved to a desired position according to an input command, and
a photoelectric device for detecting vibration of the end face of the different-color flexible disk; a splitter for separating the flexible magnetic disk; and an actuator that always positions the splitter at the optimum location for selecting a magnetic disk. 2. The flexible magnetic disk device according to claim 1, wherein the uniquely colored flexible disk is a blank flexible disk. 3. The flexible magnetic disk device according to claim 1, wherein the uniquely colored flexible disk is a plating type flexible disk.