JPS5990256A - Magnetic disk device - Google Patents

Abstract

PURPOSE:To detect easily the erroneous insertion of a magnetic disk and to improve operativity by using a light emitting and a photodetecting element for detecting the erroneous insertion of the magnetic disk, and ejecting the magnetic disk from an automatic loading mechanism on the basis of the detection result. CONSTITUTION:When a photodiode 81a emits intense light, the light in the normal loading state of the magnetic disk pierces the disk body through a small window for an index and is photodetected by a phototransistor 81b. Consequently, the phototransistor 81b turns on and the output potential of a comparator 82 rises to a high level. When the disk is loaded by erroneous insertion, the light from the diode 81a is shielded by the jacket, then the light is not detected by the phototransistor 81b. At this time, the output potential of the comparator 82 is at a low level. A control part 10 detects whether the disk is inserted normally or not according to whether the level is high or low, and when it is loaded normally, the disk is ejected from the automatic loading mechanism.

Description

TECHNICAL FIELD The present invention relates to a magnetic disk device, and more particularly to a magnetic disk device that uses an automatic loading mechanism (two-way loading of a magnetic disk to record and reproduce information).

Prior Art In this type of magnetic disk loading (2), the magnetic disk is inserted into the device with its front and back facing in a predetermined direction, and is transferred to the clamping position by an automatic loading mechanism (2), then clamped and loaded. After 7C, the magnetic disk is brought into contact with the magnetic head C to record/reproduce information.

During this insertion (when the second operator inserts the magnetic disk in the wrong direction (front and back) (hereinafter referred to as erroneous insertion, and when it is inserted correctly, it is referred to as normal insertion), the recording/playback operation will not be performed. do not have.

However, conventional devices of this type (2) do not have a means to detect and notify erroneous insertion. It may take up to an hour for the operator to realize that the cause of the malfunction is due to incorrect insertion. For example, the operator may think that the device has malfunctioned. This is extremely wasteful.Also, in the conventional device, when correcting an incorrect insertion, the operator must first reverse the automatic loading mechanism to eject the magnetic disk and then reinsert it. In this respect, the conventional device had the disadvantage of very poor operability.

Purpose The present invention has been made in view of the above, and an object of the present invention is to provide an inexpensive and simple structure (2) that can detect erroneous insertion of a magnetic disk and allow the operator to easily correct the erroneous insertion; To provide a magnetic disk device with excellent operability (
There are two.

Hereinafter, the present invention will be described in detail based on the drawings (Example C2, which is a two-part figure).

Embodiment FIGS. 1(a) and 1(b) illustrate a magnetic disk used in a magnetic disk device according to the present invention.

The one indicated by the reference numeral 1 is a magnetic floppy disk (hereinafter abbreviated as disk), and its disk body 1'
is a thin disc-shaped mylar sheet (formed by applying dimagnetic powder.The disc body 1' has a C2 center opening 1a for rotational drive during recording/reproduction, but the area near it (
Second, an index hole 2 for index detection is provided. The disk body 1' is housed in a jacket indicated by 3.

The jacket 3 is usually made of thick black paper and is formed into a substantially square bag shape, and its center (two central openings 3a are located at the upper center and opening 1 of the disc body 1' when the disc body 1' is accommodated).
Become concentric with a. The jacket 3 is formed with a head window 3b, which is an opening through which the magnetic head slides into contact with the disk body 1'c during recording and reproduction. In addition, a small index window 4, which is a hole corresponding to the index pole 2 of the disc body 1', is formed near the center opening 3a. Every time the main body 1' rotates once, the positional force is realized.

Through the small index window 4 and the index pole 2, an erroneous insertion/index detection circuit C2, which will be described later, detects erroneous insertion of the disk 1 and detects an index during recording/reproducing operations.

FIG. 2 is a block diagram showing the configuration of the main parts of the magnetic disk device according to the present invention. In the figure, reference numeral 10 indicates a control unit that controls the overall configuration. Control part 1
The outputs of the disk insertion detection section 5 and the clamp completion detection section 6 are connected to the long side of o, and the outputs of the disk ejection switch 7 and the incorrect insertion index detection circuit 8 are connected via a NAND circuit 9. ing. Further, a motor drive circuit 11 for driving the motor 1λ is connected to the output side of the control unit 10. The motor 12 is connected to a disk transfer mechanism section 13 or a clamp mechanism section 14 (the two are connected to each other).

The control section 10 includes a disk insertion detection section 5, a clamp completion detection section 6, a disk ejection switch 7,
The input signal C1 from the index detection circuit 8 therefore controls the entire configuration, controlling the drive of the motor 12 via the motor drive circuit 11, and driving the motor 12 between the disk transfer mechanism section 13 and the clamp mechanism section 14 (two connected and drive it.

As a result, disk transfer (drawing in, ejection) and clamping operations are performed.

FIG. 3 shows the configuration from the disk insertion detection section 5 to the erroneous insertion/index detection circuit 8 in more detail.

The disk insertion detection section 5 detects when the disk 1 is inserted into the magnetic disk device C2 and outputs a disk load signal A to the control section 10.

The disk insertion detection section 5 includes a photosensor 9'51 that detects the insertion of the disk 1, and a comparator 52 whose negative input terminal is connected to the output of the photosensor 51. When inserting disk 1, photo sensor 51
The output potential of becomes high level, and the comparator 52 sends the low level disk load signal A to the control unit 10.
(Fires one shot.

The clamp completion detection section 6 detects the completion of clamping when the clamping of the disk 1 is completed, and issues two low-level clamp completion signals to the control section 104.

The disc eject switch y-7 is a switch for ejecting the disc 1 after the recording/reproducing operation is completed. Disk ejection switch 7 is normally OFF! It is turned on when the disc is ejected after recording/playback is completed. Therefore, the input voltage of the NAND circuit 9 connected to the disk eject switch 7 is normally at a high level, and becomes a low level only when the disk eject switch 7 is ON.

The input on the other side of the NAND circuit 9 is connected to the following (the output of the incorrect insertion/index detection circuit 8 mentioned in Section 2), so the level of the output of the NAND circuit 9 is the same as that of the disc ejection switch 7 and the incorrect insertion/index detection circuit 8. The level of the output potential of both circuits 80 is determined by (2). When the output of the NAND circuit 9 is at a high level C, the control section 10 is configured to eject the disk 1.

The erroneous insertion/index detection circuit 8 is used both to detect erroneous insertion of the disk 1 and to detect an index during recording/reproducing operations. In the figure, the reference numeral 81 indicates a photosensor, which is composed of a photodiode 81a which is a light emitting element, and a phototransistor 81b which is a light receiving element which receives the light and becomes conductive. The collector of the phototransistor 81b is connected to the negative input terminal (-) of the comparator 82, and the output of the comparator 82 is connected to one input C2 of the aforementioned NAND circuit 9.On the other hand, the photodiode 81a of the food sensor 81 The emitters of two transistors 83 and 84 are connected in parallel.
The collectors of each of
resistance value.

The bases of the transistors 83 and 84 are connected to the collector and base of the switching transistor 85 respectively. 2;≠≠#=→The transfer completion signal C is applied to the ice cube.

When the transfer completion signal C turns ON, the switching transistor 85 turns ON, the base current of the transistor 83C flows and turns ON, and the base of the transistor 84 is grounded and turns OFF. Since the resistance value of the current limiting resistor R1 is smaller than the current limiting resistor R2, the photodiode 81
A relatively large current flows through ai2, and the photodiode 81a emits light relatively strongly.

On the other hand, when the transfer completion signal C turns OFF, the switching transistor 85 turns OFF, and the transistor 8
3 is OFF, and transistor 84 is ON. Since the resistance value of the current limiting resistor R2 is larger than that of the current limiting resistor R1, a relatively small current flows through the photodiode 81a, so that the photodiode emits a relatively weak light.

On the other hand, the photodiode 131a and the phototransistor 81b are arranged so that when the disk 1 is normally inserted and transferred to the clamp position, they face the position where the small index window 4 is located and sandwich the disk 1 between them. Two devices are used.

When the photodiode 81a emits strong light (when the switching signal C is ON), the light emitted by the photodiode 81a when the disk 1 is normally loaded passes through the disk body 1' through the small index window 4 and is emitted by the photodiode 81a. Transistor 81b (-) receives light. As a result, phototransistor 81b is turned on and the output potential of comparator 82 (potential applied to NAND circuit 9) becomes high level.

Furthermore, if the disk 1 is incorrectly inserted and loaded, the light from the photodiode 81a is blocked by the jacket 3, and the phototransistor 81b does not receive the light.

The phototransistor 81b is turned off and the output potential of the comparator 82 becomes low level.

As mentioned above, the disk ejection switch 7 of the NAND circuit 9
The applied voltage on the side is normally at a high level (- is always at a high level. Therefore, depending on whether the output of the comparator 82 is at a high level or a low level at this time, the output of the NAND circuit 9 is at a low level or a high level, respectively. Based on the height of this level, it is detected whether the control unit 10x disk has been inserted normally.

As described above, when the transfer completion signal C turns ON (2.
The erroneous insertion/index detection circuit 8 functions to detect erroneous insertion. At this time, due to the detection of incorrect insertion of the disk 1, the output potential of the comparator 82, that is, the input potential on one side of the NAND circuit 9 becomes a low level, and the input potential on the other side of the ejection switch 7 is at a high level, so that the NAND circuit 9 The output becomes high level. Thereby, the control section 10 performs an operation to eject the disk 1.

On the other hand, in the erroneous insertion/index detection circuit 8, the transfer completion signal C is turned ON, and the photodiode 81a becomes relatively (-
It functions to detect the index when it emits weak light.

If the light emission is weak, the light does not pass through the disk body 1'. Therefore, the rotation C1 of the disc body 1' during recording/playback
Therefore, the index hole 2 and the small index window 4
The light from the photodiode 81a receives the light from the phototransistor 81b only when the positions of the photodiode 81a and the phototransistor 81b coincide with each other.

When the phototransistor 81b receives light, it is turned on and the output potential of the comparator 82 becomes high level, and vice versa, it becomes low level. As mentioned earlier, the potential applied to the input of the disk ejection switch 7 side of the NAND circuit 9 is normally at a high level, so the output potential of the NAND circuit 9 is at the C low level when an index is detected, and at other times it is at a high level. . The index is detected in the above manner.

Next, the automatic loading/misinsertion detection operation on the wood grain side configured as described above (see FIG. 4) will be explained accordingly. FIG. Char 1 is a diagram.

First, when the disk 1 is inserted into the magnetic disk device and the disk insertion detection section 5 detects it and the disk load signal A turns ON (step Sl), the control section 10 controls the motor and drive circuit 11. , the motor 12 is connected to the disk transfer mechanism section 13 and rotated in the normal direction (
Step S2).

From 1 drive C2 of the disk transport mechanism section 13, the disk 1
is drawn into the magnetic disk drive C2 (step S3).
When the disk 1 is transferred to the clamp position, the control unit 10 turns on the disk transfer completion signal C (step S4). At the same time, the second control unit 10 stops the motor 12 via the motor drive circuit 11 (step S5). This causes the disk 1 to stop at the clamp position.

After a while, the disk transfer completion signal C turns on, so the transistor 83 turns on, and the photodiode 8
1a emits light strongly due to the flow of a relatively strong current, and the erroneous insertion/index detection circuit 8 operates as an erroneous insertion detection circuit (step S6).

Depending on whether the output potential of the next C Ninand circuit 9 is at a high level or a low level, the control section 10 determines whether or not there is an erroneous insertion (step S7).

In the case of a high level (111 erroneous people), the transfer completion signal C is turned OFF, the erroneous insertion/index detection circuit 8 is switched, and the function as an erroneous insertion detection circuit is canceled (step S8).

Further, the motor 12 connected to the C disk transfer mechanism section 13 is driven to rotate in reverse (step s9).

Disk 1 is ejected (step 510). When the disk 1 reaches a predetermined ejection position, the motor 1o is stopped via the motor drive circuit 9 (step 51).
1).

At this point, the process proceeds to the end, but of course, if the ejected disk 1 is corrected in the correct direction and reinserted, steps 81 to S7
Repeat the action.

Then, in step S7i2, if there is no incorrect insertion and the output of the NAND circuit 9 becomes a low level (No,
The control section 10 switches the connection of the motor 12 from the magnetic disk transfer mechanism section 13 to the clamp mechanism section 14, and then drives it once (step 512).

Further, similarly to step S8, the disk transfer completion signal C is turned OFF, and the erroneous insertion/index detection circuit 8 is released from its function as an erroneous insertion detection circuit. That is, it operates as an index detection circuit (step 513).

7c When the clamping of the disk is completed by driving the clamping mechanism section 14, the clamping completion signal turns ON (
step 514), that signal human power (two therefore motors 12
The drive is stopped, the clamping operation is ended (step 515), and the operation is ended.

In the above embodiment (-), the photodiode 81a of the incorrect insertion detection circuit 8 is 11, but it is of course possible to use two photodiodes with different current values instead of -. .

As is clear from the explanation given below, the present invention (magnetic disk device according to the second invention) uses a light-receiving element and a light-emitting element to detect the index of the C2 magnetic disk during recording and reproduction to prevent incorrect insertion of the magnetic disk. If a magnetic disk is inserted incorrectly, it will automatically detect and eject the magnetic disk from the automatic loading mechanism. In this case, the C1 operator can immediately notice this, easily insert it again correctly, and quickly perform recording and reproducing operations, greatly improving operability.

Moreover, the means for detecting erroneous insertion requires only a means for switching the magnitude of the current flowing through the light emitting element of the index detecting means (transistors 83 and 85 and current limiting resistor R1 in the embodiment), which requires a major change in the conventional device. It can be constructed very easily and inexpensively.

[Brief explanation of the drawing]

Each figure is a detailed explanation of the present invention; the first is a front view, the second is a block diagram explaining the configuration of the embodiment, the third is a more detailed block circuit diagram of FIG. 2, and the fourth is a is the second
FIG. 4 is a flowchart I diagram illustrating the flow of control operations of the control unit in FIGS. 5...Disk insertion detection section 6...Clamp completion detection section 7...Disc ejection switch 8...Incorrect insertion/index detection circuit 9...NAND circuit 10...Control section 81a...Photo Diode 81b...Phototransistor 83.84...Transistor 85...Switching transistor R1, R2...Current limiting resistor Patent applicant: Canon Electronics Co., Ltd. - Yarn Sales Filing Book (Effective December 1982) Mr. Commissioner of the Patent Office on the 27th ■0 Display of this matter 1982 Patent Application No. 197549 2,
Name of the invention: Magnetic disk device 3, relationship with the weakness of the person making the correction Name of patent applicant: Canon Seiko Co., Ltd. 4, Agent
Telephone: 03 (268) 2481

Claims (1)

[Claims] In a magnetic disk drive in which a magnetic disk is loaded by an automatic loading mechanism and an index of the magnetic disk is detected via a light emitting element and a light receiving element, means for detecting erroneous insertion of a magnetic disk by using the light emitting element and the light receiving element. What is claimed is: 1. A magnetic disk device, characterized in that the magnetic disk device is configured to eject a magnetic disk from the automatic loading mechanism based on the detection result.