JPH01311459A - Magnetic recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a magnetic recording/reproducing device using a magnetic recording medium such as a video floppy.

[Prior Art] Conventionally, holders for video floppies and the like in magnetic recording and reproducing devices are often made of conductive metal such as iron plates. However, in order to reduce costs, it is essential to mold this holder during mass production.

However, when this holder is made of a non-conductive molding material, static electricity generated on the floppy disk cannot escape through the holder and enters the head, giving rise to a situation where recording and reproduction are adversely affected.

The mechanism of this static electricity generation will be described below with reference to FIG.

FIG. 2 is a cross-sectional view for explaining a recording/reproducing disk drive portion provided inside a magnetic recording/reproducing apparatus of the present invention and a conventional magnetic recording/reproducing apparatus (not shown). Board 3
6 is shown attached. When the disk rotation motor 31 is driven, the magnetic disk I rotates. At this time, static electricity is generated due to friction with the recording/reproducing disk 34 or the stabilizing plate 20, and the magnetic disk l is charged. This static electricity is collected by a liner 6 or the like provided inside the cassette 2 and guided to the cassette 2. - Since the cassette 2 is generally made of conductive plastic,
Static electricity will be transmitted to the holder 9 through the cassette 2.

On the other hand, if the Holter 9 is made of a non-conductive material, there will be no place for the charges to escape, and they will fly from the magnetic disk 1 into the head 34, adversely affecting the recording/ifT raw signal.

[Problems to be Solved by the Invention] As mentioned above, when the conventional holder for holding the cassette is made of a non-conductive member, the rotation of the magnetic disk inside the cassette causes friction with the head or the stabilizer plate. When static electricity is generated and the magnetic disk is charged, there is no place for the charge to escape, and the charge flies from the magnetic disk into the head, causing the problem that it mixes into the recording/playback signal as noise.

In addition, the generated static electricity causes the inner surface of the cassette to stick to the magnetic disk, resulting in an increase in the load on the disk rotation motor, causing the problem that the disk cannot rotate.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a magnetic recording/reproducing device that can prevent static electricity from entering the head and smoothly rotate a magnetic disk.

[Means for Solving the Problems] -1- In order to achieve the first objective, the magnetic recording + Ij production device of the present invention makes the holder that holds the magnetic recording medium conductive when rope inking the magnetic recording medium. It is made of synthetic plastic.

[Function] By having the configuration described in item 112, static electricity generated on the magnetic disk can be released to the outside through the holder, preventing static electricity from jumping into the head, and allowing the disk to rotate smoothly. It is possible to prevent noise from being mixed into the recorded/playback signal.

[Example] Fig. 1 is a perspective view of a rope ink device which is an embodiment of the present invention, and Fig. 2 is a perspective view of the cassette after rope ink, the rope ink device, and the disk dry part. It is a sectional view seen from the C direction in .

In FIGS. 1 and 2, ``■'' is a flexible magnetic disk, and in this example, the recording track is formed in the shape of a concentric circle. 2 is a cassette that is a storage container for the magnetic disk l; 3 is a center core provided at the center of the magnetic disk l, and has a center hole 3a;
In this case, it is fitted into a spindle 32 (FIG. 2) of a magnetic disk rotation drive shaft, for example, a disk rotation motor 31 (FIG. 2). 4 is a magnetic bottle (hereinafter referred to as PG upper pin) as a marker member for supporting the rotational phase of the disk l provided in the center core 3; 2a is provided on both sides of the cassette 2 in correspondence with the center core 3; 2b is a stabilizing plate 20 and a recording or reproducing magnetic head 3.
4 (FIG. 2) facing the disk 1 in the cassette 2, openings 2c and 2 are provided on both sides of the cassette 2.
d is a hole for positioning when installing the cassette 2 into the main body of the apparatus. A liner 6 is installed inside the cassette and is generally made of a conductive member. Further, a magnetic plate 5 is attached to the lower part of the center core 3, and the PG upper pin is magnetically coupled to this magnetic plate 5.

A holder 9, which is a main part of the present invention and receives the cassette 2, is made of conductive plastic.

The cassette 2 is inserted in the direction of arrow C in FIG. 1 and taken out in the opposite direction. Two pins lO are implanted on the sides of the holder 9, two on each side. Reference numeral 11 denotes a side plate fixed to the chassis board 36 of the main body of the apparatus by screws (not shown), and in FIG.
Furthermore, a pair of pins 12 are each implanted. 1
A slide plate 3 is slidable along the side plate 11 in the direction of the arrow AB in FIG. 1, and is provided with a rack 13a, a cam groove 13b, and a long hole 13c extending in the direction of the arrow AB. The pin lO implanted in the holder 9 is connected to the side plate 1
1 through the long hole 11a of the slide plate 13.
As described later, as the slide plate 13 moves in the direction of the arrow A-B, the pin lO moves along the long hole 11a in a direction perpendicular to the direction of the arrow A-B. . The pin 12 implanted in the side plate 11 engages with the elongated hole 13c of the slide plate 13, thereby moving the lithite plate 13 to the side plate t.
It is held slidably in the A-B direction along i, and
Limit its moving end. In addition, the side plate 11 and the slide plate 1
3 and its attached members are provided in pairs on the left and right.

15 has a ohm gear and is driven by the drive motor 4. 16 is a ohm wheel which meshes with the ohm gear 15, a gear 17 coaxial with this wheel meshes with a small gear 18, and the small gear 18 meshes with a rack 13a of the slide plate 13. The shaft (not shown) of the small gear 18 extends to the slide plate 13 on the opposite side, and a small gear is provided at the tip thereof to mesh with the rack 13a of the slide plate 13 on the opposite side. The slide plates 13 are slid in synchronization.

20 is a stabilizing plate for stably running the magnetic disk 1 at least in the head portion, 21 is a guide shaft for moving the stabilizing plate 20 up and down (see FIG. 2), and 22 (
2) is a pin planted on the tail end surface of the stabilizing plate 2o, and this pin 22 is inserted into the bolt provided on one slide plate 13 through an elongated hole (not shown) provided on one side plate 11. It engages with the cam groove shown. Therefore, when the slide plate 13 slides in the direction of the arrow AB, the pin 22 and the stabilizer plate 20 move in the vertical direction.

Reference numerals 23 and 24 denote a yoke and a coil wound around the yoke as a detection member for detecting the PG upper pin provided on the center core 3, and the tip of the support plate 25 fixed to the tip surface of the stabilizing plate 20. It is attached to the bottom surface, and when the stabilizer plate 20 or the cassette 2 is lowered to come into contact with the magnetic disk l through the opening 2b of the cassette 2, as shown in FIG. It becomes possible to be positioned.

26 is a center core pressing member; 27 is a pin installed inside the tail end falling portion 26a of the pressing member 26; the tip thereof is rounded; 29. One end of the spring 29 is connected to a hole 2 formed in the trailing end portion 26a of the pressing member 26.
6b, and the other end is the bent part 11 of one side plate ll.
It is hung on the hole lid made in c. 30 is a shaft that rotatably supports the pressing member 26;
rotates about the shaft 30 in the direction of arrow DE as shown in FIG.

Here, the suppressing portion 26C at the tip of the pressing member 26 is arranged to prevent a collision with the detecting coil 24.
It has a recess 26d for avoiding the center core 3, and a pressing protrusion 26e for pressing the center core 3 at two points 180 degrees opposite each other on both sides of the recess 26d.

In FIG. 2, numeral 31 is a disk rotation motor attached to the lower side of the chassis board 36, 32 is a spindle for rotating the disk attached to its rotating shaft on the upper side of the chassis substrate 36, and the center hole of the center core 3 is 3a, and has a flange portion 32a that defines a reference plane for the center core 3, and a magnetic plate attached to the lower surface of the center core 3 on the upper surface of the flange portion 32a. A magnet 33 for attracting 5 is attached. The magnet 33 causes the PG upper pin to generate magnetic flux, and the coil 24
The magnetic flux from C pin 4 will be detected. A recording or reproducing head 34 is provided so as to come into contact with the recording surface of the disk l through the opening 36a of the chassis board 36 and the opening 2b of the lower surface of the cassette 2, and is supported by the head carriage 35. head carriage 35
A well-known head moving mechanism (not shown) moves the arrow F-G in the figure.
Steps are sent in the direction.

In the above configuration, when the cassette 2 is inserted manually or by some mechanical means into the holder 9 in the direction of arrow C in FIG. The motor 14 is activated by the operation at . This causes the slide plate 13 to slide in the direction of arrow A. At this time, the pin lO of the holder 9 moves along the cam groove 13b of the slide plate 13, or its movement in the direction of arrow A-B is blocked by the elongated hole 11a of the side plate 11, so it moves along the elongated hole 11a. Arrow A-
Move downward perpendicular to direction B.

Along with this, the Holter 9 and the cassette 2 inserted therein
or descend. Then, the Holter 9 and the cassette 2 form the chassis shown in FIG. 2! I (When the predetermined loading position on the plate 36 is reached, the positioning pin (not shown) provided on the chassis board 36 or the positioning hole 2c of the cassette 2
and 2d to position the cassette 2, and at this time, the cassette loading 1 completion detection switch or the cassette 2
By detecting the completion of loading, or by manually operating a switch, the motor 14 is stopped, and the cassette 2 is held at the loading position.

On the other hand, as the slide plate 13 moves in the direction of arrow A,
The pin 22 installed on the tail end surface of the stabilizing plate 20 moves along an unillustrated cam groove of one of the slide plates 13, but movement in the direction of arrow A-B is caused by a long hole (not illustrated) of one side plate 11. and therefore descend along this elongated hole. FIG. 2 shows this lowered state. Through the above operation, the stabilizer plate 20 is guided by the guide shaft 21 and lowered to its predetermined position, and when the magnetic disk 1 rotates, air is created between the disk facing surface of the stabilizer plate 20 and the surface of the magnetic disk l. By forming the layer to a desired thickness, it becomes possible to stably run the magnetic disk 1 while maintaining good contact between the recording or reproducing head 34 and the disk 1. Also, at this time, the detection coil 24 is positioned at a predetermined position for detecting the PG bin 4 of the center core 3.

On the other hand, the center core pressing member 26 is normally located at the position shown by the two-dot chain line in FIG. 2 due to the low lift portion of the cam 28, or when the cassette 2 is injected with the rope, the center core pressing member 26 is moved in the direction of arrow A in FIG. When it moves, its tail end falling part 26
Pin 27 of a.

High lift portion 28a of cam 28 on one slide plate 13
(Fig. 2), it rotates about the shaft 30 in the direction indicated by the arrow in Fig. 2, and at this time, the center core 3 is pressed against the spindle 32 by the pressing protrusion 26e on the pressing part 26c at the tip. and forcibly push the magnetic plate 5 into the flange of the spindle 32. The magnetic disk 1 and the head 34 are properly positioned on the reference plane defined by the iB32a, so that the magnetic disk 1 and the head 34 are kept in good contact with each other when the magnetic disk 1 rotates. Note that the cam 28 of the slide plate 13L is located at its high lift portion 28a.
(Fig. 2) or in the area corresponding to the lower horizontal portion 13b' of the cam groove 13b of the slide plate 13 (Fig. 1), that is, at least the cassette 2 has been lowered to a predetermined loading position. In this state, the pressing member 26 is centered
The core 3 is in a state of being suppressed, and then, by further movement of the slide plate 13 in the direction of the arrow A, its low lift portion rotates the pressing member 26 in the direction of the arrow E, thereby performing a suppressing operation. It is configured to release the .

In this way, the magnetic disk 1 installed in the device main body
rotates during recording and reproduction and comes into contact with the head 34. Then, static electricity is generated due to the friction between them.

This static electricity is transmitted to the cassette 2 by the liner 6, and most of it is transmitted to the holster 9 and escapes to the outside. Further, a portion escapes to the outside through a portion where a positioning pin (not shown) provided on the chassis board 36 engages with the positioning holes 2c, 2d of the cassette 2. Therefore, charges will not accumulate on the magnetic disk l or cassette 2, and the head 34
It is possible to prevent the recording and playback signals from entering the recording and playback signals.

[Effects of the Invention] As explained above, in this invention, by constructing the holder using conductive plastic, the number of conductive parts that come into contact with the cassette increases, and it is possible to prevent static electricity from jumping into the head. Since the magnetic disk is not stuck to the magnetic disk, the rotation of the magnetic disk can be performed smoothly, and noise can be prevented from being mixed into recorded/reproduced signals.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a loading device which is an embodiment of the present invention, and Fig. 2 is a cross-sectional view of the cassette after rope ink, the rope inter-device, and the disc tray portion as seen from direction C in Fig. 1. be. In the figure. 1: Magnetic disk 2. Case 6: Liner
9 Holter 31: Disc rotating motor 34: Het agent Patent attorney 1) Kita ;;t Haru

Claims (1)

[Claims] A magnetic recording/reproducing device characterized in that a holder for holding a magnetic recording medium during loading of the magnetic recording medium is made of conductive plastic.