JPH0766617B2 - Disk surface detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the front and back surfaces of a disk cartridge (hereinafter abbreviated as a cartridge) to be inserted into a disk drive, in other words, an optical disk, a magnetic disk, etc. housed in the cartridge. The present invention relates to a disk surface detection device for detecting the front and back surfaces of the disk surface of a recording medium.

(Prior Art) In recent years, recording media have become high performance and small in size, and for example, those having a cartridge structure of 8.89 cm (3.5 inches) in diameter, which is called a micro floppy disk, will be mainstream in the future.

Conventionally, in order to access this kind of cartridge disk from the front and back, a pickup window (hereinafter referred to as an access window) is formed on the front and back of the cartridge body, and a shutter is provided to simultaneously open and close the access windows on both the front and back. There is.

FIG. 3 is a plan view showing such a conventional cartridge, and (a) and (b) respectively show a case where the shutter is closed and a case where the shutter is opened.

Reference numeral 1 is a cartridge body, and 2 is a shutter. Further, 3 is a shutter trigger provided for opening the shutter 2, and 4 is an access window provided on the surface of the cartridge body 1 for accessing the stored disk 5, which is also formed on the back surface. Reference numeral 6 is a shutter opening / closing groove, and 7 is a magnetic material hub corresponding to a magnet clamp provided on the disk drive side.

The present invention detects the front and back surfaces of a cartridge having such a structure, and thus the front and back surfaces of the contained disk.

By the way, when using such a cartridge that can be accessed from both sides, it is necessary to display the surface of the disk to be accessed. Since the front surface and the back surface of the disk and the surface of the cartridge are the same, the front surface and the back surface of the cartridge will be described below.

Conventionally, in this type of cartridge, the detection or display of the front and back surfaces is determined by a mechanism provided separately mechanically or optically, or by reading the information recorded on the disc of the recording medium. Met.

(Problems to be Solved by the Invention) Therefore, if another means is configured in the disk drive,
It requires a complicated mechanism to be installed in a small space, and it takes a considerable amount of time to read the information recorded on the disc to determine the front and back sides. There is a drawback that requires.

An object of the present invention is to solve the above-mentioned conventional drawbacks, and it is an object of the present invention to provide a disc surface detection device capable of discriminating the front and back surfaces of a disc inserted in a disc drive device at low cost.

(Means for Solving the Problems) The present invention is directed to the above object by forming a pair of grooves in a disk cartridge so that their positions are switched depending on the orientation of the front surface or the back surface of the disk cartridge, and these grooves are respectively associated with the grooves. A pair of removable shutter opening / closing levers are provided with light-shielding plates, respectively, and the first shutter opening / closing lever is inserted when the disk opening / closing lever and the groove are engaged / disengaged with one surface of the disk cartridge facing up. Of the second shutter opening / closing lever shuts off the second optical switch when the insertion is completed, and the other surface of the disc cartridge is turned up. When the insertion is completed, the light shielding plate of the second shutter opening / closing lever shuts off the second optical switch first, and when the insertion is completed, the first shutter opening / closing register is opened. This is accomplished by placing each of the optical switches so that the light shield of the bar shuts off the first optical switch.

(Operation) According to the present invention, the front and back of the cartridge insertion can be determined according to the operation order of the two optical switches, and the malfunction of the open / close lever can be determined by the fact that the optical switches do not operate together.

(Example) Hereinafter, the present invention will be described by way of examples with reference to the drawings.

FIG. 1 is a plan view of an essential part showing a configuration of a disk surface detecting device according to an embodiment of the present invention, in which a tip part of a cartridge to be inserted into a disk drive device is also shown. Other reference numeral 8 is a roller,
It is supported by the tip of an opening / closing lever 10 for rotating around the support shaft 9 and opening / closing the shutter 2. 11 is the open / close lever
A light shielding plate fixed to the reference numeral 10 and an optical switch 12 operated by the light shielding by the light shielding plate 11 are composed of an optical sensor such as a photo interrupter.

In the same manner, 13 is another roller, which is rotated around the support shaft 14 and is supported by the tip of the opening / closing lever 15, 16 is a shading plate fixed to the opening / closing lever 15, and 17 is a pair corresponding thereto. The opening / closing levers 10 and 15 which are shutter opening / closing levers of
Are arranged so as to intersect with each other, and the pair of optical switches 12 and 17 corresponding to the respective light shielding plates 11 and
It is designed to turn on and off by blocking and opening the optical path at 16. 18 is a shutter trigger 3 of the shutter 2.
The shutter trigger 3 and the notch 18 are groove-shaped and are formed on the cartridge main body 1 correspondingly to each other, and their positions are changed depending on the vertical direction of the front surface or the back surface of the cartridge. Is formed and arranged as follows.

When the cartridge is inserted into the disk drive having the opening / closing levers 10 and 15 from the direction of arrow A, one roller 8 is fitted into the shutter trigger 3 as shown by the solid line in the initial stage of the insertion process. The other roller 13 rides on the front edge (the tip in the figure) of the shutter 2.

When the cartridge is further inserted, rollers 8 and 13
Moves on an arc whose radius is the length of the opening / closing lever 10 or 15 having the support shafts 9 and 14 as the rotation axes, and contributes to the opening of the shutter 2 when the insertion is completed, as shown by the chain double-dashed line. The other roller 13 'which did not exist is fitted into the notch 18' formed corresponding to the shutter trigger 3 on the cartridge body 1, and at that time, the shading plates 11 ', 16' of the opening / closing levers 10 ', 15'.
Are both inserted into the optical switches 12 and 17, respectively, to block their optical paths and generate outputs as sensors.

In the above operation, at the initial stage of insertion of the cartridge main body 1 shown by the solid line in the figure, one roller 8 is at the shutter trigger 3 and the other roller 13 is at the front edge of the cartridge main body 1, and therefore the opening / closing levers 10 and 15 are not moved. There is a difference in rotation angle,
Therefore, the degree of insertion of the shading plates 11 and 16 is different at the initial stage of insertion, so that even if the shading plate 16 on one side shields the optical switch 17, the shading plate 11 on the other side at that time
Is not shaded.

As described above, the opening / closing lever 1
There is a difference in the degree of rotation of 0 and 15, so the optical switch 1
The operation timings of 2 and 17 are different, and the operation order is determined by the opening direction of the shutter 2 (leftward in FIG. 1). That is, when the cartridge is inserted into the disk drive device with the cartridge shown in FIG.
3. The installation state of the cutout 18 is reversed, the shutter 2 is moved to the right, and the positions of the shutter trigger 3 and the cutout 18 are exchanged with each other. Therefore, in the initial stage of the insertion process, the light blocking plate 11 blocks the optical switch 12 and the other light blocking plates 16 do not block the optical switch 17 contrary to the state described above. Both light shields 11 'and 16' are connected to both optical switches 12 and 17 in the same manner as the two-dot chain line of
Will be inserted into the optical path.

FIG. 2 shows a case where the shutter is opened / closed erroneously, and the opening / closing lever 10 for opening the shutter accidentally rides on the shutter 2.

In this case, the shading plates 11 and 16 start to shade both optical switches 12 and 17, but when the insertion of the cartridge is completed, the shading plate 1
1, 16 penetrate the optical switches 12, 17 and cannot be operated, so that the disc surface cannot be detected.

As described above, the present invention provides the optical switches 12 and 17 having different operation sequences corresponding to the front and back of the cartridge to be inserted,
The disc surface to be accessed is detected according to the operation sequence, and at that time, it is also possible to detect whether the shutter 2 is completely opened or closed.

(Effects of the Invention) As described in detail above, according to the present invention, the front and back of the cartridge to be inserted into the disk drive device, and thus the front and back of the disk housed in the cartridge are protected by the light shield plate fixed to the open / close lever. The detection is performed according to the operation order, and when a surface different from the disk surface to be accessed is inserted, there is an effect that the cartridge can be ejected before the loading is completed, and if the opening / closing of the shutter of the cartridge is abnormal, it can be detected. At that time, the cartridge can be ejected to avoid damage to the optical pickup and the magnetic head.

[Brief description of drawings]

FIG. 1 is a plan view showing an essential part of an embodiment of the present invention, FIG. 2 is a plan view illustrating a detection error of the present invention, and FIG. 3 is a plan view showing a cartridge. 1 ... Cartridge body, 2 ... Shutter, 3 ... Shutter trigger, 4 ... Access window, 5 ... Disc, 6 ...
… Shutter open / close groove, 7 …… Magnetic material hub, 8,13 …… Roller, 9,14 …… Support shaft, 10,15 …… Shutter open / close lever,
(Abbreviated as open / close lever), 11, 16 ... Shading plate, 12, 17 ... Optical switch, 18 ... Notch.

Claims (1)

[Claims] 1. A pair of grooves are formed in a disk cartridge so that their positions are changed depending on the direction of the front surface or the back surface of the disk cartridge, and a pair of shutter opening / closing levers which can be engaged with and disengaged from these grooves are respectively provided with light-shielding plates. By disengaging the shutter opening / closing lever and the groove, the light shielding plate of the first shutter opening / closing lever is set to the first position when the disc cartridge is inserted with one surface thereof facing upward.
First, the optical switch is shut off, and when the insertion is completed, the light shielding plate of the second shutter opening / closing lever shuts off the second optical switch, and when the other side of the disc cartridge is inserted upward, Each of the optical switches so that the light blocking plate of the second shutter opening / closing lever blocks the second optical switch first, and the light blocking plate of the first shutter opening / closing lever blocks the first optical switch when the insertion is completed. And a front surface and a back surface of the disk housed in the disk cartridge are detected by the output states of these optical switches.