JPH0216450Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a recording and reproducing device that performs recording and reproducing by mounting and rotating a disk-shaped recording medium and moving the head in sliding contact with the disk-shaped recording medium in the radial direction. .

A disk cassette consisting of a flexible disc-shaped magnetic disk (magnetic sheet) housed in a flat cassette housing is attached to the device main body, and the magnetic disk is rotated at high speed within the cassette housing, and the magnetic head is rotated. Conventionally, devices have been known that record and reproduce video signals, audio signals, digital signals, etc. by sliding in sliding contact with the magnetic surface of the magnetic disk while moving in the radial direction of the magnetic disk. In this type of conventional recording/reproducing device, the magnetic disk is sandwiched between the flat pressure bonding surface of the felt pad and the spherical or curved sliding surface of the magnetic head, and the magnetic disk is pressed between both of them. Since the head was moved in the radial direction, the contact of the magnetic head against the magnetic surface of the magnetic disk was unstable.

By the way, conventionally, in a recording/reproducing apparatus in which a magnetic disk is housed in a thin jacket, as shown in Japanese Patent Laid-Open No. 56-54665, for example,
Some apparatuses have a pad that extends over the entire movement range of the head and are configured to move only the head, thereby improving the head's contact with the disk-shaped recording medium.

However, in the case of this recording/reproducing apparatus, when the disk-shaped recording medium is loaded into the apparatus, an operation of moving the disk-shaped recording medium up and down is not required because the jacket is thin.

That is, in this case, if the disk-shaped recording medium is inserted horizontally into the apparatus, the head is already almost in contact with this disk-shaped recording medium, so even if the pad is next pressed against this disk-shaped recording medium, There is no fear that the disk-shaped recording medium will be damaged by bending deformation.

On the other hand, in the case of the disk cassette,
Since the cassette is thick, it is necessary to move the disk cassette up and down when installing it in a recording/reproducing apparatus. Therefore, the structure disclosed in the above-mentioned publication cannot be applied to such a disk cassette recording and reproducing apparatus.

In view of the above-mentioned points, the present invention has been developed so that when a disk-shaped recording medium is installed in a recording/reproducing apparatus, the head and pad can be connected without damaging the disk-shaped recording medium even if the disk-shaped recording medium is moved up and down. It is an object of the present invention to provide a recording/reproducing device capable of holding a disk-shaped recording medium between the two.

The present invention provides a drive for driving the disk-shaped recording medium in a recording and reproducing apparatus that performs recording and reproduction by mounting and rotating a disk-shaped recording medium and moving a head in sliding contact with the disk-shaped recording medium in the radial direction. a holder into which the disk-shaped recording medium is inserted; a holder elevating means for lowering the holder to mount the disk-shaped recording medium on the driving means; and a holder located at a predetermined position facing the head. a pad extending over the entire range of movement of the head; rotatably supported by the holder; and the pad is attached to one end thereof, and the other end is arranged so as to be engageable with a fixed portion of the device. and a padded support member,
The other end of the pad support member engages with the fixed portion of the device and rotates the pad support member as the holder descends, thereby causing the disc-shaped recording medium to move between the pad and the head. The recording and reproducing apparatus is configured such that the head is held between the heads near the predetermined position, and only the head can be moved in the radial direction during recording and reproducing.

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a main body 1 of a recording/reproducing apparatus. A flat brushless motor 3 is provided on a chassis 2 of the apparatus main body 1, and a rotary table 5 is coaxially connected to a rotating shaft 4 of this motor 3. installed.
The rotary table 5 is provided with a rotation drive pin 6 and a ring-shaped magnet 7, respectively. The chassis 2 is also provided with a head support 10 supported at both ends by a feed screw 8 and a guide shaft 9 that are parallel to each other.
A magnetic head 12 is mounted approximately at the center of the head. The feed screw 8 is intermittently rotationally driven by the step motor 13, and as a result, the head support 10 and the magnetic head 12 are linearly and at a constant pitch in the radial direction of the rotating shaft 4 of the brushless motor 3. It is now being moved back and forth intermittently.

Further, a cassette mounting device 15 is provided on the chassis 2. This cassette mounting device 15 is equipped with a pair of left and right side plates 16 and 17 that are fixed to the chassis 2 with screws while facing each other, and between these pair of side plates 16 and 17, a cassette holder 18 is placed between the upper and lower sides. It is arranged so that it can be moved in any direction. The above-mentioned cassette holder 18 is
It consists of an upper plate part 19 and a pair of side plate parts 20 and 21 provided on both left and right sides of the upper plate part 19 and having a U-shaped cross section. A disk cassette 22, which will be described later, is inserted between the pair of side plates 20 and 21 in the direction of arrow A in FIG. 1, and both left and right sides of the disk cassette 22 are supported by the side plates 20 and 21. It's becoming like that. In FIG. 1, 23a, 23b, 23c are stopper pieces 24a, 24b, 24c, 24 that prevent the disk cassette 22 from moving in the insertion direction (direction of arrow A).
d is a cassette receiving pin that supports the disk cassette 22 at a predetermined height position.

Further, a notch 25 is formed in the upper plate portion 19 of the cassette holder 18, and a pad 26 is disposed above the notch 25 to face it. That is, a support shaft 29 is fixed between a pair of vertical pieces 27 and 28 provided on the upper surface plate 19, and a leaf spring support member 30 is rotatably supported by this support shaft 29. The other end 31a of a leaf spring member 31 is fixed to one end 30a of the support member 30, and a pad 26 made of, for example, felt is attached to one end 31b of the leaf spring member 31. As clearly shown in FIGS. 2 and 3, the leaf spring support member 30 is constantly urged in the direction of arrow B about the support shaft 29 by the urging force of the coiled spring 32 attached to the support shaft 29. The rotation of the support member 30 in the direction of arrow B is prevented by the other end 30b of the support member 30 engaging with the side plate 17 fixed to the chassis 2 as described above. When the cassette holder 18 is in the temporary mounting position (upper position), the pad 26 is disposed upwardly away from the notch 25 of the upper plate part 19.

As clearly shown in FIG. 4, the pad 26 of this embodiment has a crimping surface 26a formed in a shape corresponding to the arc-shaped sliding surface 12a of the magnetic head 12, that is, a curved surface having an arc-shaped cross section. Furthermore, this pad 26 extends over the entire length of the moving range l of the magnetic head 12, as shown in FIG.

The structure of the recording/reproducing apparatus main body 1 has been described above. Next, the structure of the disk cassette 22 applied to this apparatus main body 1 will be explained with reference to FIG. The disk cassette 22 has a magnetic disk 35 rotatably housed in a flat cassette housing 34 made of synthetic resin or the like, and a disk-shaped core metal 36 is attached to the center of the magnetic disk 35. There is. The disk-shaped convex portion of the core bar 36 is rotatably fitted into a circular opening (not shown) provided in the lower wall of the cassette housing 34. An insertion hole 37 into which the rotating shaft 4 of the brushless motor 3 is inserted and a pin insertion hole 38 into which the rotation drive pin 6 is inserted are provided on the lower surface of the core bar 36, respectively. Further, as shown in FIGS. 5 and 6, a long hole 40 for inserting a pad and a long hole for inserting a head extending in the radial direction of the magnetic disk 35 are provided in the upper and lower walls of the front side of the cassette housing 34. 41 are provided respectively.

Next, the operation of the recording/reproducing apparatus constructed as described above will be described.

First, when the disk cassette 22 is moved in the direction of arrow A in FIG.
At the same time, it is lowered from the temporary mounting position (upper position) to the regular mounting position (lower position). Along with this, core metal 3
6 is placed on the rotary table 5 by the attraction force of the magnet 7, and the rotary shaft 4 and the rotary drive pin 6 are inserted into the insertion holes 37 and 38 of the core metal 36, respectively. At the same time, the magnetic head 12 is inserted into the long hole 41 of the cassette housing 34 as shown in FIG. 5, and its sliding surface 12a is brought into sliding contact with the magnetic surface of the magnetic disk 35. On the other hand, the cassette holder 18
When descending relative to the side plate 17, the other end 30b of the leaf spring support member 30 receives a force from the side plate 17 in the direction of arrow C in FIGS. 1 and 3. Member 31 and pad 26
are rotated in the direction of arrow D in FIG. The position will be such that almost no bending deformation will occur.
The crimping surface 26a of the pad 26 is attached to the leaf spring member 3.
As a result, as shown in FIGS. 3 to 5, the magnetic disk 35 is pressed by the magnetic head 12 and the pad 26 with an elastic restoring force of 1.
is held.

Next, when power is supplied to the brushless motor 3 and the step motor 13, the magnetic disk 35 is rotated at high speed, and the magnetic head 12 holds the magnetic disk 35 between it and the pad 26 as shown by the arrow in FIG. E or E' direction (magnetic disk 35
(in the radial direction) intermittently. As a result, concentric recording tracks are formed on the magnetic surface of the magnetic disk 35, or information recorded on the recording tracks is reproduced.

According to the recording and reproducing apparatus configured as described above, the crimp surface 26a extends over the entire length of the moving range l of the magnetic head 12 and is curved to correspond to the shape of the sliding surface 12a of the magnetic head 12. A pad 26 having a pad 26 is provided on the main body 2 of the apparatus, and only the magnetic head 12 is moved while the magnetic disk 35 is held between the sliding surface 12a of the magnetic head 12 and the pressure bonding surface 26a of the pad 26 during recording and reproduction. Therefore, the magnetic disk 35 can be stably held between the magnetic head 12 and the pad 26, and the magnetic head 12 can be brought into good contact with the magnetic disk 35.

Although the present invention has been described above with reference to one embodiment, the present invention is not limited to this embodiment, and various modifications and changes can be made based on the technical idea of the present invention.

As described above, the present invention provides a pad that extends over the entire moving range of the head in the main body of the recording/reproducing apparatus, and during recording and reproduction, only the head is moved to the position where the disk-shaped recording medium is held between the head and the pad. The disk-shaped recording medium is moved in the radial direction. Therefore, according to the recording/reproducing apparatus of the present invention, the disk-shaped recording medium can be held between the head and the pad with good stability.
In other words, the pad can be stably pressed against the head via the disc-shaped recording medium, and the head can be brought into good contact with the disc-shaped recording medium.

Further, in the present invention, the other end of the pad support member engages with the fixed part of the recording/reproducing device, and the pad support member is rotated as the holder descends, so that the holder is lowered and the disc-shaped recording medium is gradually attached. As the head approaches, the pad also gradually approaches the disk-shaped recording medium.

Therefore, the disk-shaped recording medium can be held between the head and the pad without substantially bending the disk-shaped recording medium. There is thus no risk of the disc-shaped recording medium being damaged.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention,
Fig. 1 is an exploded perspective view of the main body of the recording/reproducing device, Fig. 2 is a rear view of the main unit with the disk cassette placed in the temporary mounting position, and Fig. 3 is a rear view of the main body of the device with the disk cassette placed in the normal mounting position. FIG. 4 is an enlarged sectional view showing the crimped state of the head and pad, and FIG.
FIG. 6 is an enlarged sectional view taken along the V line and a perspective view of the disk cassette. In addition, in the symbols used in the drawings, 3...
...Flat type brushless motor (drive means), 12...
...Magnetic head, 15...Cassette mounting mechanism (holder elevating means), 17...Side plate (fixed part), 18...
...Cassette holder, 26... Pad, 30... Leaf spring support member (pad support member), 31... Leaf spring member (pad support member), 30b... Other end,
31b...one end, 35...magnetic disk, l...
...The moving range of the head.

Claims (1)

[Claims for Utility Model Registration] A recording and reproducing apparatus that performs recording and reproduction by mounting and rotating a disk-shaped recording medium and moving a head in sliding contact with the disk-shaped recording medium in a radial direction, comprising: a holder into which the disk-shaped recording medium is inserted; a holder elevating means for lowering the holder to mount the disk-shaped recording medium on the driving means; and a predetermined head facing the head. a pad extending over the entire range of movement of the head when the head is in the position; and a pad rotatably supported by the holder and having the pad attached to one end thereof and the other end engaging a fixed part of the device. a pad support member disposed such that the other end of the pad support member engages the fixed portion of the device to rotate the pad support member as the holder is lowered; The recording and reproducing apparatus is configured such that the disk-shaped recording medium is held between the pad and the head near the predetermined position, and that only the head can be moved in the radial direction during recording and reproducing.