Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse...
Reexamination Certificate
1992-11-23
2001-06-12
Neyzari, Ali (Department: 2651)
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
C369S077210, C369S075210
Reexamination Certificate
active
06246639
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention generally relates to magneto-optical disc recording and/or reproducing apparatus for writing in and/or reading out an information signal from a rewritable magneto-optical disc and, more particularly, is directed to a lifting mechanism for lifting a supporting arm that supports thereon a magnetic head which generates an external magnetic field to a magneto-optical disc.
2. Description of the Related Art
It is customary that a magnetic head for a rewritable magneto-optical disc (hereinafter simply referred to as an MO disc) is located as close as possible to the MO disc in order to generate a sufficient external magnetic field to the surface of the MO disc when an information signal is recorded on the MO disc. Therefore, when the MO disc is loaded onto and/or ejected from the magneto-optical disc recording and/or reproducing apparatus, the magnetic head must be isolated from the MO disc so that the MO disc is prevented from coming in contact with the magnetic head. A mechanism for lifting an arm that supports the magnetic head is therefore used to isolate the magnetic head from the MO disc. The conventional arm lifting mechanism is generally composed of an arm supporting mechanism and an actuator such as a plunger or the like secured to one portion of the arm supporting mechanism.
Since, however, the arm supporting mechanism has little space to spare, the above arm lifting mechanism cannot be incorporated into the small space substantially from a technical standpoint. Further, the arm supporting mechanism has mounted thereon a relatively heavy actuator because it is coupled to the moving mechanism of an optical pickup device. Therefore, the load is increased and a drive motor suffers from the increased load so that the conventional arm supporting mechanism is not suitable for reducing an amount of electric power. To solve the above problem, it is proposed that the actuator is supported to a stationary member such as a chassis or the like that is not operated in a ganged relation with the arm supporting mechanism. However, an arm itself is operated in a ganged relation with the optical pickup device and the arm is moved in the inner and outer diametrical directions of the MO disc during an information signal is written in and/or read out from the MO disc. There is then the problem such that an undesirable load is applied to the arm by the actuator.
OBJECTS AND SUMMARY OF THE INVENTION
Therefore, it is an object of the present invention to provide an improved magnetic head supporting arm lifting mechanism in which the aforesaid shortcomings and disadvantages of the prior art can be eliminated.
It is an object of the present invention to provide a magnetic head supporting arm lifting mechanism in which an arm having mounted thereon a magnetic head can be smoothly lifted without a load applied thereto by an arm lifting mechanism.
It is another object of the present invention to provide a magnetic head supporting arm lifting mechanism that can be simplified in arrangement.
It is still another object of the present invention to provide a magnetic head supporting arm lifting mechanism in which an arm can be lifted in a small space, thereby making a magneto-optical disc recording and/or reproducing apparatus compact in size.
According to an aspect of the present invention, there is provided a magnetic head supporting mechanism for a magneto-optical disc recording and/or reproducing apparatus which includes an optical pickup device being made movable in the radial direction of a magneto-optical disc and radiating a light beam on tracks formed on the magneto-optical disc, and a magnetic head disposed on a head supporting mechanism movable in synchronism with the optical pickup device in an opposing relation to the optical pickup device across the magneto-optical disc so that the magnetic head generates an external magnetic field on the tracks of the magneto-optical disc. This magnetic head supporting mechanism comprises an arm member having on one end thereof provided the magnetic head and being rotatably supported by a movable member that is moved in synchronism with the optical pickup device in the direction in which the magnetic head comes in contact with or away from a surface of the magneto-optical disc, a lifting member being interposed between the arm member and the magneto-optical disc in substantially parallel to the moving direction of the magneto-optical disc and being supported at least on one end thereof to a chassis so that the lifting member becomes rotatable in the direction in which it comes in contact with or away from the surface of the magneto-optical disc surface, and a driving device for rotating the lifting member so that the arm member is lifted in the direction in which the arm member comes away from the surface of the magneto-optical disc.
REFERENCES:
patent: 4879616 (1989-11-01), Ando
patent: 5168484 (1992-12-01), Wachi et al.
patent: 5197050 (1993-03-01), Murakami et al.
patent: 5224079 (1993-06-01), Inoue
patent: 5309421 (1994-05-01), Fujisawa
patent: 0 133 594 A3 (1985-02-01), None
patent: 0 404 589 A2 (1990-12-01), None
patent: 0 439 286 A3 (1991-07-01), None
patent: 0 455 158 A2 (1991-11-01), None
patent: 0 524 839 A2 (1993-01-01), None
Neyzari Ali
Sony Corporation
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