JP2681071B2 - Optical recording / reproducing device - Google Patents

Description

The present invention relates to an optical recording / reproducing device. [Prior Art] An optical recording / reproducing apparatus is known which records data optically or optically / magnetically and optically reads the data. The recording medium is generally disc-shaped. [Problems to be Solved by the Invention] Therefore, in this type of device, high-speed access is desired, and for that purpose, it is necessary to increase the rotation speed of the disk.
The conventional one has structural and economic restrictions, and there is a limit to speeding up. The present invention has been made in order to solve such problems, and provides an optical recording / reproducing apparatus capable of dramatically increasing the speed as compared with the conventional one and having improved durability. With the goal. [Means for Solving the Problems] An optical recording / reproducing apparatus according to the present invention comprises a superconductor, and a plate-like body or a partial spherical shell having an opening on the upper side, and the plate-like body or part. A rotating body, which is arranged above the spherical shell, is composed of a permanent magnet capable of being magnetically levitated by the Meissner effect of a plate-shaped body or a partial spherical shell and an optical recording medium integrated with the permanent magnet, and is arranged around the rotating body. And a coil for applying a rotating magnetic field to the permanent magnet. [Operation] The rotor magnetically levitates due to the presence of the permanent magnet and the plate-shaped body or the partially spherical shell. Then, by energizing the coil and applying a rotating magnetic field, the rotor rotates, and high-speed access to the data recorded on the recording medium becomes possible. [Embodiment] FIG. 1 is a schematic side view of a reproducing apparatus according to the present invention. In the figure, 1 is a hemispherical shell, which is made of a superconductor. This is not necessary when using a material exhibiting superconductivity at room temperature, but otherwise it must be cooled to a critical temperature or lower by a cooling device (not shown). Examples of materials used include Ba: Y: Cr: O = 2: 1: 3: 7 _-x (critical temperature = -184 ° C) Ba: La: Cu: O = 0.15: 0.85: 1: 4 (critical temperature =-). 273 ° C.) Sr: La: Cu: O = 0.8: 1.2: 1.3 (critical temperature = −223 ° C.) or the like may be used. The hemispherical shell 1 is placed so that the upper opening is on the upper side and the opening edge is horizontal. A rotating body 2 is floated above the hemispherical shell 1. The rotating body 2 is a disk-shaped optical recording medium 21 and a permanent magnet 22 integrally attached to the outer edge thereof.
Consists of The outer diameter of the rotating body 2 is slightly smaller than the opening diameter of the hemispherical shell 1, and the permanent magnet 22 functions as a rotor of the motor as described below. Therefore, as shown in FIG. 2n (n is a natural number) are evenly arranged, and 2n pieces are arranged so that the NS directions alternate. This rotating body 2
Stops in space because the hemispherical shell 1 exhibits superconductivity. Further, since the rotating body 2 is circular, it floats concentrically with respect to the hemispherical shell body 1. Around the rotating body 2, concentrically with the rotating body 2, for example, four coils 3, 3, 3, 3 are arranged at four equally spaced positions. The coils 3, 3 ... And the hemispherical shell 1 are fixed to a fixing member (not shown). The coil 3 is connected to the excitation circuit 4,
An exciting current is propagated from here to generate a rotating magnetic field. As a result, the stators of the coils 3, 3 ... and the permanent magnets 2 of the rotating body 2
A motor having a rotor 2 is formed, and the rotating body 2 rotates. A guide rod 5 is arranged above the rotating body 2 in the radial direction of the rotating body 2, and a reading head 6 is movably mounted on the guide rod 5. The reading head 6 is provided with an element for emitting and receiving light and a pulse motor (neither is shown) for moving along the guide rod 5. The pulse motor and the excitation circuit 4 are driven by an access control signal generated by the access control circuit 7. In the device of the present invention configured as described above, the coils 3, 3, 3, 3 are excited by the energization from the exciting circuit 4 and the rotating body 2 is always rotated at a high speed. Then, in this state, the read head 6 is moved to the radial position corresponding to the instructed track by the access control signal issued by the access control circuit 7. This allows the required access. Although the hemispherical shell 1 is used in the above-mentioned embodiment, the same effect can be obtained with a partial spherical shell or a plate-shaped body. The present invention can also be applied to a recording device. [Effect] In the apparatus of the present invention as described above, since the rotating body 2 is supported and rotated in a non-contact manner, high-speed rotation is possible and the access speed is increased accordingly. Further, since the present invention has no wear and has high durability and further has no friction, energy loss due to rotation is small.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic side view of a device of the present invention, and FIG. 2 is a schematic plan view of a rotating body and a coil. 1 ... Hemispherical shell, 2 ... Rotating body, 3 ... Coil 21 ... Recording medium, 22 ... Permanent magnet

Claims (1)

(57) [Claims] Due to the Meissner effect of the plate-shaped body or the partial spherical shell, which is made of a superconductor and is arranged above the plate-shaped body or the partial spherical shell, An optical system comprising: a rotating body composed of a magnetically levitable permanent magnet and an optical recording medium integrated with the permanent magnet; and a coil disposed around the rotating body and providing a rotating magnetic field to the permanent magnet. Recording / playback device.