JPH0552587B2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a recording carrier loading device in a recording or reproducing apparatus using a disc-shaped rotating recording carrier such as a flexible magnetic disk, and particularly to a recording carrier loading device for loading a recording carrier onto a rotational drive member. It is related to the device.

[Background Art] In a recording or reproducing device using a disk-shaped rotating recording carrier, such as a flexible magnetic disk, a center hub is attached to the center of the magnetic disk, and this center hub is driven by a spindle that is rotationally driven by a disk rotation motor. It is attached to the disk to drive the rotation of the disk. In this type of device, if the fit between the center hub and the spindle is loose, the magnetic disk will not rotate normally during recording or playback operations; conversely, if the fit is tight, the magnetic disk will not fit smoothly onto the spindle. The problem arises that it cannot be done. Therefore, we installed a permanent magnet on the flange of the spindle of the disk rotation motor.
A device has been proposed in which a soft magnetic plate is provided on the lower surface of a center hub, and a permanent magnet applies a magnetic attraction force to the soft magnetic plate, thereby attracting the soft magnetic plate and coupling the two. However, even in devices that perform this type of magnetic coupling, it is difficult to ensure that the center hub is accurately positioned on its reference plane, for example on the flange surface of the spindle, so it is difficult to ensure that the magnetic disk is positioned relative to the recording or reproducing head. It is difficult to position it on a predetermined mounting surface for holding it in a predetermined abutting state. In addition, in still image recording or playback devices that require strict mounting accuracy, several hundred grams of force is required to attach the center hub to the spindle, which requires a large magnet and makes it difficult to make the device smaller and lighter. It will be a hindrance.

Furthermore, a device has been proposed in which a mechanism is provided on the upper surface of the center hub to press the center hub against the spindle, as in a floppy disk device, but in this device, the disk rotation motor is Since the mechanism is configured to rotate while being pressed against the spindle, there is a drawback that the load becomes large and causes uneven rotation.

In order to eliminate such inconvenience, the present invention relates to a device in which the record carrier is attached to the rotational drive member by pressing a part of the record carrier, and then this pressure is released when the record carrier is rotated. The applicant previously filed Japanese Patent Application No. 58-50037, No. 58
- Proposed by No. 82353 etc.

〔the purpose〕

The present invention is a further improvement of the previous proposal made by the applicant, and an object of the present invention is to provide a record carrier loading device that allows for smoother and better mounting of a record carrier onto a rotational drive member. That is.

Another object of the present invention is to provide a record carrier loading device that can shorten the time required for so-called start-up at the start of recording or reproduction.

Note that the record carrier used in this specification refers to a disc-shaped rotatable record carrier in a magnetic, optical, or capacitive recording or reproducing method.
The record carrier rotation drive unit refers to a drive source such as a motor or a transmission member such as a spindle coupled to the drive source.

[Explanation based on examples]

Hereinafter, the means taken in the present invention to achieve the above object will be illustrated by means of illustrated embodiments,
explain.

Here, an example in which the record carrier is a flexible magnetic disk will be explained, but a known magnetic disk cassette will be explained with reference to FIG. 1, and an example of a conventional record carrier loading device will be explained with reference to FIG.

In FIG. 1, 1 is a flexible magnetic disk, 2 is a cassette in which the magnetic disk 1 is housed, and is formed of a box-shaped frame. 3 is a center hub fixed to the center of the magnetic disk 1; 4 is a cassette 2 corresponding to the center hub 3;
The upper and lower openings 5 indicate openings into which a magnetic head, which will be described later, is inserted. The magnetic disk 1, housed in a cassette 2, is loaded into a recording or reproducing apparatus, for example, by means described later, and recording or reproduction is performed.

FIG. 2 is an exploded sectional view of an example of a conventional record carrier loading device, in which a state in which a cassette 2 is loaded is shown by a chain double-dashed line. In the figure, members indicated by the same reference numerals as in FIG. 1 have the same configuration and function as the members in FIG. 1, and therefore, description thereof will be omitted. Regarding other members, 6 is an internal chassis of the recording or reproducing device, 7 is a disk rotation motor attached to the chassis 6, and 8 is a spindle of the disk rotation motor 7. Center hub 3 is magnetic disk 1
It is used to attach the spindle 8 to the spindle 8 with high precision, and is made of synthetic resin or the like. 9a is a magnetic head which is a recording or reproducing head, 9 is a head carriage, and arrows C, 9 are moved by means not shown.
It is moved in the D direction. Reference numeral 10 indicates a soft magnetic plate fixed to the lower surface of the center hub 3, and reference numeral 11 indicates a permanent magnet attached to the flange portion 8a of the spindle 8, which magnetically connects the center hub 3 and the spindle 8. There is. However, this device also has a drawback in that it is difficult to ensure that the magnetic disk 1 is accurately positioned on a predetermined mounting surface (the upper surface of the flange portion 8a).

In addition, according to another conventional example in which a mechanism for forcibly pressing the center hub 3 against the spindle 8 is disposed on the upper surface of the center hub 3, as described above, when the disk rotation motor 7 is loaded by these mechanisms, Since it rotates, its load increases, causing uneven rotation.

An embodiment of the present invention which eliminates the drawbacks of the prior art described above is shown in FIGS. 3a-c and 4.

FIG. 3 is a side sectional view of the record carrier loading device;
Figure a shows a state in which the cassette holder is raised, figure b shows a state in which the cassette holder is lowered, and figure c shows a state in which the pressing means is acting on the lowered cassette holder. FIG. 4 shows its control circuit.

In FIGS. 3a to 3c, members having basically the same configuration and function as those in FIGS. 1 and 2 are designated by the same reference numerals in FIGS. Omitted.

Reference numeral 21 denotes a cassette holder which can be displaced in the directions of arrows A and B as shown in FIG.
It is taken out from the holder 21 to the outside of the recording or reproducing apparatus. The cassette holder 21 is movable with respect to the chassis 6 by means not shown between the raised position shown in FIG. 3a and the lowered positions shown in FIGS. It is positioned by the means shown. Reference numeral 22 denotes supporting parts for the cassette 2, and a plurality of them are provided on the chassis 6, but these may be constructed integrally with the chassis 6, or may be constructed separately.

An arm 23 is an example of a pressing means in the present invention, and is configured to be rotatable about a shaft 24. The shaft 24 is attached to a rising portion 21a provided on the upper surface of the cassette holder 21. 23a is the pressing end of the arm 23, as shown in Fig. 3c.
The clockwise rotation of the arm 23 forces the center hub 3 with its end 23a against the spindle 8 through the opening 21d of the cassette holder 21, as shown in FIG. For this purpose, for example, two knife edge-shaped end portions 23a (that is, fork-shaped pressing portions) are provided, and the upper surface of the center hub 3 is touched at two points in the diametrical direction on the front side and the back side of the paper in FIG. Alternatively, a top plate may be provided on the upper surface of the center hub 3, and the end portion 23a may be pressed at the center of the top plate.

Note that when the center hub 3 is pushed into the spindle 8, the flange surface 8a of the spindle 8 serves as a reference surface for determining the height of the center hub 3. Further, as shown in FIG.
By imparting elasticity to b, the excessive pushing when pushing in the center hub 3 can be absorbed by the deflection of the narrow neck portion 23b, as shown in FIG. 3c.

A spring 25 biases the arm 23 in a counterclockwise direction, and is stretched between a spring hook pin 23c on the arm 23 and a spring hook pin 21c on the rising portion 21b of the cassette holder 21. Note that the counterclockwise rotation of the arm 23 is restricted by the abutment between the tip of the rising portion 21b and the lower end surface of the arm 23, and in the above-mentioned state of abutment, the arm 23 is not pressed. The end portion 23a is as shown in FIG.
As shown in FIG. 2B, the cassette holder 21 is maintained in a state where it does not enter the internal space.

A solenoid 26 is fixed on the chassis 6. Reference numeral 26a denotes an armature rod of the solenoid 26, and when the solenoid 26 is energized, it receives magnetic repulsion and is caused to protrude by a predetermined amount. Figure 3b
As shown in FIG. 2, the solenoid 26 is arranged so that when the arm 23 is lowered together with the cassette holder 21, the armature rod 26a is closely opposed to the bent portion 23d at the tail end of the arm 23.

Reference numeral 27 denotes a normally open switch, which is disposed within the recess 6a of the chassis 6 so as to be closed by the end of the cassette holder 21 when the cassette holder 21 is lowered, as shown in FIGS. 3b and 3c. It is set up.

28 is opened by a portion of the cassette holder 21 when it is in the raised position shown in FIG. 3a, and is opened by its own conductivity when it is in the lowered position shown in FIGS. It is a normally closed switch that is closed when the switch is closed, and is fixedly placed in a position within the recording or reproducing device.

In FIG. 4, 29 indicates that after the cassette 2 has been inserted into the cassette holder 21 to a predetermined position,
A normally open cassette detection switch located at a suitable location within the cassette holder 21 so as to be closed;
As shown in the figure, the switch 27 is a switch 29,
It is connected in series with resistors R ₁ and R ₂ between the power supply (+Vcc) and circuit ground, and switch 28 is connected in parallel to the series response of switch 27 and resistor R ₂ .

In response to the high potential at the connection point a between the switch 27 and the resistor R ₂ , a solenoid 30 is activated for a period sufficient to ensure that the arm 23 presses and attaches the disk center hub 3 to the spindle 8. A one-shot circuit (mono multi-vibrator) generates a high-level pulse to energize 26, and 31 responds to a high-level pulse from the one-shot circuit 30 to generate a high-level pulse when the pulse is neutral. This is a solenoid drive circuit that energizes the solenoid 26 while it is at the level.

32 is the connection point b between switch 29 and switch 28
A falling period type RS flip-flop 33 connected to be set by a change in potential from high to low and reset by a fall of an output pulse from the one-shot circuit 30.
34 is an OR gate that receives the Q output of the flip-flop 32 and a motor rotation command from a recording standby circuit or a reproduction command circuit (not shown).
This is a motor drive circuit that operates the motor 7 in response to the high output of the gate 33.

Next, the operation of the apparatus having the above configuration will be explained.

First, when the magnetic disk cassette 2 is inserted into the cassette holder 21 to a predetermined position in the raised state of the cassette holder 21 shown in FIG. 3a, the switch 29 shown in FIG. 4 is closed. Next, from this state, the cassette holder 21
When the switch 28 is lowered in the direction of the arrow A, the switch 28 closes at the beginning of this lowering, and therefore, as shown in FIG.
start.

In order to lower the cassette holder 21 in the direction of arrow A, for example, the holder 21 is connected to the main body of the apparatus or its lid by a hinge provided on the back side of the paper in FIG. All you have to do is let it happen.

Now, as shown in FIG. 3b, when the cassette holder 21 reaches the lowered position, the cassette holder 21 is locked in the lowered position by means not shown. At this time, the bent portion 23d at the tail end of the arm 23 approaches the armature rod 26a of the solenoid 26, and the cassette holder 2
1 closes the normally open switch 27. When the normally open switch 27 is closed, the one shot circuit 30 generates a high level pulse and the solenoid drive circuit 31 in FIG.
While this pulse is high level, solenoid 2
6 is energized. When the solenoid 26 is energized,
As shown in Figure 3c, the armature rod 26a
protrudes, thereby pushing up the bent portion 23d at the tail end of the arm 23, and the arm 23 rotates clockwise against the spring 25. At this time, as shown in FIG. 3c, the pushing end 23a The center hub 3 of the magnetic disk 1 is pushed into the spindle 8 and brought into contact with the reference surface of the flange portion 8a of the spindle 8.

In addition, as shown in FIG. 3c, the excessive pushing at this time is absorbed by the bending of the narrow neck portion 23b of the arm 23, resulting in damage to the center hub 3, the flange portion 8a of the spindle 8, etc. There is no fear.

When the pulse output from the one-shot circuit 30 is completed and the power to the solenoid 26 is cut off, the armature rod 26a is lowered and the arm 23 is rotated counterclockwise by the spring 25, as shown in FIG. 3b. state, and the pressing operation of the pressing portion 23a of the arm 23 against the center hub 3 is released.

Note that when the pulse output from the one-shot circuit 30 ends, the flip-flop 32 is reset and its Q output becomes low, so that the motor 7 is stopped. Thereafter, the motor 7 is rotated by a motor rotation command during recording or reproduction.

As described above, in this embodiment, the arm 23
The pressing of the disk center hub 3 by the spindle 8 is performed under the rotation of the spindle 8.
The attachment of the hub 3 to the spindle 8 is facilitated,
Further, the pressing force on the center hub 3 is also made uniform, so that the mounting can be performed satisfactorily.

In addition, in the configuration of the above embodiment, the switch 27
The one-shot circuit 30 constitutes a control means for temporarily operating the arm 23 which is a pressing means, and the switch 28 and the flip-flop 32 operate the motor 7 and the slave in connection with the lowering of the cassette holder 21. The spindle 8 is a rotational driving member.
This constitutes a control means for starting the motor 7 and the spindle 8, and releasing the pressing operation of the arm 23 and stopping the operation of the motor 7 and spindle 8.

By the way, if you want to operate a video camera and take a picture as soon as possible, for example if you have a once-in-a-lifetime chance to shoot, insert cassette 2 into cassette holder 21 and then move cassette holder 21 into the recording position. It is necessary to quickly perform a series of operations for lowering the disc to a predetermined position (Fig. 3 b, c) and rotating the disc rotation motor 7. Therefore, for example, while performing a disc loading operation, It is beneficial to quickly bring the rotating motor 7 to a predetermined rotation speed in order to record high-quality images. To this end, for example, the flip-flop 32 and the OR gate 33 in FIG. 4 may be omitted, and the signal at the connection point b may be directly applied to the motor drive circuit 34 as a motor rotation command. It is something.

Also, in this case, the pressing end 23a of the arm 23
may be configured to be freely rotatable with respect to the center hub 3. An example of that case is shown in FIG.

FIG. 5a shows a side sectional view of the pressing member attached to the end of the arm, and FIG. 5b shows a side view of the pressing member abutted against the center hub of the magnetic disk.

In FIG. 5a, 30 is an arm that is rotated clockwise by the solenoid 26 shown in FIG. As shown in FIG. 3, this arm 30 may be partially provided with an elastic thin neck portion 23b, or may not be provided with the thin neck portion 23b. Reference numeral 31 denotes a hole passed through the tip of the arm 30, and a connecting shaft 32 is inserted into the hole 31 so as to be rotatable and slidable in the vertical direction. A retaining pin 33 is inserted through the upper end of the connecting shaft 32 in the diametrical direction. Reference numeral 37 denotes a disc-shaped member fixed to the lowermost end of the connecting shaft 32, and a spring 34 is stretched between the disc-shaped member 37 and the arm 30. An inverted conical member 36 having an annular flat surface that comes into contact with the upper end surface of the center hub 3 is attached to the disc-shaped member 37 by a screw pin 35. The inverted conical member 36 is rotatable relative to the screw pin 35. Note that instead of the inverted conical member 36, a cylindrical member having an annular flat surface may be used.

In FIG. 5b, when the switch 27 is closed by the lowering of the cassette holder 21 and the solenoid 26 is energized, the arm 30 is rotated clockwise as shown in FIG. 3b. As a result, the annular flat surface of the inverted conical member 36 comes into contact with the upper end surface of the center hub 3. Further rotation of the arm 30 in the clockwise direction causes the arm 30 to move toward the center via the spring 34 and the inverted conical member 36.
A pressing force is applied to the upper end surface of the hub 3. Since the inverted conical member 36 is rotatable with respect to the threaded pin 35, it is rotated together with the center hub 3 by the spindle 8 which has started rotating, and applies a pressing force to the center hub 3, causing the spindle 8 to rotate. Install it on the 4, the solenoid 26 is de-energized, the arm 30 rotates counterclockwise again, and the inverted conical member 36 moves away from the center hub 3.

As is clear from the above description, since the inverted conical member that applies pressing force to the center hub 3 is configured to be rotatable, even if the spindle 8 starts rotating, it will not be braked. , the disk rotation motor 7 can quickly reach a predetermined rotational speed without applying a large load, and therefore,
The time required for the disk rotation motor 7 to reach a predetermined rotation speed is not increased, the servo system is not disturbed, and sliding noise due to friction is generated during the pressing operation. Not at all.

Note that, in the present invention, as in the conventional example explained in FIG. This does not preclude the use of both loading methods.

〔effect〕

As explained above, according to the present invention, a pressing means for pressing the record carrier against the record carrier rotation driving member is provided, and the pressing means is temporarily operated under the operation of the rotation driving member to cause the recording carrier to record. Since the record carrier is attached to the rotational drive member, the record carrier can be attached to the rotational drive member smoothly, and the pressure on the record carrier is made uniform, so that the record carrier can be attached well. Furthermore, since the pressing means is temporarily operated to control the recording carrier to be attached to the recording carrier rotation driving member, the pressing means does not place a load on the rotational driving member during recording or reproducing operation, so that the rotation is not caused by the pressing means. The drive member can be made smaller.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a magnetic disk cassette, FIG. 2 is an exploded sectional view of an example of a conventional record carrier loading device, and FIGS. 3 a, b, and c are an embodiment of a record carrier loading device according to the present invention. , in which a shows a state in which the cassette holder is raised, b shows a state in which the cassette holder is lowered, and c shows a state in which the pressing means is activated when the cassette holder is in a lowered state. A cross-sectional view is shown respectively, and the fourth
The figure shows the control circuit, FIGS. 5a and 5b show another embodiment, and FIG.
shows a side view of the pressing member in contact with the center hub. In the figure, 1 is a magnetic disk, 2 is a cassette, 3 is a center hub, 7 is a disk rotation motor, 8 is a disk rotation spindle, 21 is a cassette holder, 23 is an arm, 26 is a solenoid, 26a is an armature rod, 27, 28 and 29 are switches, 30 is a one-shot circuit, 31 is a solenoid drive circuit, 32 is a flip-flop, and 34 is a motor drive circuit.

Claims (1)

[Scope of Claims] 1. A recording medium movable between a first position for receiving and taking out a record carrier and a second position for mounting the received record carrier with respect to a record carrier rotation drive member. a record carrier holder; a distance from the first position to the second position of the holder;
a first control means for activating said rotary drive member in relation to movement into a position of; pressing means for pressing a part of said record carrier to mount said record carrier on said rotary drive member; and second control means for temporarily operating the pressing means when the rotational drive member is in operation. 2. The record carrier loading device according to claim 1, wherein the first control means is configured to stop the operation of the rotary drive member when the pressing means is deactivated.