JPS59154680A - Magnetic recording and reproducing device - Google Patents

Abstract

PURPOSE:To make always stably a recording surface of a magnetic disk contact a magnetic head by pushing a turning disk formed by sticking a thin magnetic disk sheet onto a disk having comparatively large rigidity onto a turntable and adhering the turning disk thereto at reproduction of recording. CONSTITUTION:The turning disk 6 sticked with a magentic recording medium 1 has a rotary shaft 2 at its center and is adhered in its full face onto the turntable 7 by pushing this part. When the magnetic head 9 is pushed onto the turning disc with a prescribed pressure, since the turning disc 6 is fixed by the entire face of the turntable 7, not only a stress by the disk sheet but also the friction force with the turntable 7 are expected as the reaction force by the friction force of the magnetic head, and then the deformation on the disk surface becomes decreased. Thus, the pushing pressure of the magnetic head 9 can be increased in this way, and it is convenient to obtain a large reproducing signal.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field to which the invention pertains] This invention relates to a desk cassette and a desk rotation drive mechanism of a small magnetic desk device for use in Ci electronics, cameras, etc.

[Prior art and its problems]

FIG. 1 shows a conventional example of a desk cassette for a small magnetic desk device used in electronic cameras and the like.

The magnetic recording medium of conventional desk cassettes is in the form of a circular thin sheet and has extremely low rigidity. This desk sheet 1 is exposed through a head contact window 5 that is opened in the case 3, and in this part, both (llfl) are sandwiched between a magnetic head and a bat, and data is recorded on the rotating desk/table. In this state, the desk sheet, which has low rigidity, is rubbed between the head and the butt, and the unstable friction force causes the desk sheet to deform, causing the magnetic head to track one recording track on the desk sheet. There is a possibility that you will not be able to pursue it in a stable state.

Regarding the track feeding mechanism of the twisted magnetic head, the mechanism becomes complicated because the pad must be fed at the same time as the head is fed. Such a complicated mechanism increases the size of the entire device, making it vulnerable to external vibrations, even if it is a portable device.

[Object of the Invention] This invention improves the drawbacks of the conventional device described above.
The recording surface of the magnetic disk and the magnetic head should always be in stable contact! The purpose of the present invention is to provide a device having a simpler feed mechanism.

[Summary of the Invention] In the present invention, the desk cassette is a rotary disk in which a thin magnetic desk sheet is attached to a relatively rigid disk that serves as a bat. The disc is pressed into place, and the turntable and magnetism are in a tight state. At this time, for the desk board R, the layer that will replace the bat is tightly attached to the turntable, and the rotating surface of the turntable is made to form a stable and constant flat surface. The desk board rotates together with the turntable, achieving mechanically stable rotational movement.

〔Effect of the invention〕

With the structure described above, the desk sheet is pressed against the turntable, so its relative position with the magnetic head is always kept constant, and the instability of the frictional force caused by the pressing force of the magnetic head is caused by the desk sheet being pressed against the turntable. − No more deformation is applied to the object. As a result, the contact between the magnetic head and the disk recording surface becomes mechanically stable, resulting in stable recording and reproduction.

Moreover, by adopting such a structure, a mechanism for sending a bat at the same time as the magnetic head becomes unnecessary, and the overall structure can be simplified and the apparatus can be made more compact.

[Embodiments of the invention]

Examples of this invention are shown in FIGS. 2, 3, and 4.

Figure 2 shows a plan view (a) and a cross-sectional view (a) of the desk cassette.
b), FIG. 3 is an enlarged view of the rotating shaft 2, and FIG. 4 is a sectional view of the desk cassette shown in FIG. 2 installed.

The magnetic recording medium 1 is attached to a rotating disk 6 that serves as a bat. The rotating disk 6 has a rotating shaft 2 at its center, and by pressing this portion, the rotating disk 6 is brought into close contact with the turntable 7 over its entire surface. The recording surface of the one-rotation disk 6 is captured by the gator 3.

The rotating shaft 2 has a cross groove 1 on the surface that contacts the turntable 7.
1, and has a structure that fits with the cross-shaped protrusion at 1 while the turntable 7 is rotating. As a result, the center of rotation 1d of the rotary disk 6 is determined, and rotational force is transmitted to the rotary disk 6 at the same time.

The rotation lllI2 is the part of the rotary disk 6 that protrudes from the recording surface 1, and the rotation lllI2 is the part of the rotary disk 6 that protrudes from the recording surface 1. It has a structure that fits with Gator 3. The circumference of the rotary disk 6 is cut diagonally, and this also fits with the gator 3. As a result, the rotary disk 6 is housed in the game 3 with only its lower surface exposed.
Wa 1 turntable 6 cannot be removed from Gator 3.

The entire surface of the exposed portion of the rotary disk 6 is pressed against the turntable 7 via the rotary shaft 2 by a disk holder B. The gator 3 is fixed to the cassette holder 10 at a position where it does not contact the rotary disk 6.

Magnetic / When the RAD 9 is pressed against the rotating disk with a constant pressure, the rotating disk 6 is fixed by the entire surface of the turntable 7, so the reaction force of the frictional force of the magnetic head is not only the stress of the desk sheet, but also the turntable 7. You can also expect frictional force with the desk surface, so there will be less deformation of the desk surface. Therefore, the magnetic head 9
5 and 6 show other embodiments. In the embodiments shown in FIGS. 2, 3, and 4, the rotary disk 6 and the gator 3 engage with each other at the diagonally cut portions, so that they do not separate, and there is no protruding part or dent in the desk cassette. Although the outer shape is curving, the structure may be as shown in FIGS. 5 and 6 in order to obtain the same effect as that of the present invention. In the former embodiment, the rotating shaft had cross-shaped grooves as shown in Fig. 3, but the number of grooves may be greater as shown in Fig. 5; This has the advantage that the cassette can be easily installed.

[Brief explanation of the drawing]

FIG. 1 shows a conventional example, and FIG. 2 shows an embodiment of the present invention. Figure 3 is a partial enlarged view of Figure 2, Figure 4 is a 1-plane view of the IO of the entire embodiment, Figure 5 is a partial enlarged view of Figure 6, and Figure 6 is a partial enlarged view of Figure 6.
The figure is a sectional view of another embodiment. l... Magnetic recording medium 2... Rotating shaft 3...
・Protective gate 4... Drive shaft 5... Window for head contact 6... Turntable 7... Pattern cable
8...Desk holder 9...Magnetic head 1
0...Cassette holder 11...Mizo agent Patent attorney Nori Chika Kensuke (and 1 other person) No.
1 Figure <ay tb>

Claims (1)

[Claims] A thin disc-shaped magnetic recording medium is pasted onto a relatively thick and rigid disc, and a rotary disc (to protect the magnetic recording surface [7,
A removable magnetic desk cassette consisting of a magnetic recording surface of the rotary disk and a rotary disk case having a structure in which the opposite side is protruded; a turntable on which the exposed portion of the rotary disk of the magnetic desk cassette is placed; The magnetic recording medium is integrated with the turntable.The magnetic recording medium is integrated with the turntable.The magnetic recording medium is integrated with the turntable. It rotates, and the Table 1hII/C magnetic head presses against it! 1-1 A magnetic recording and reproducing device characterized in that it performs recording and reproducing.