Flying optical recording/playback head and method for controlling the flying height
AssigneeTosoh Corporation
InventorKoji Katayama
Life of this patent
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Abstract
A flying optical recording/playback head for near-field optical recording/playback, which is capable of keeping the flying height of an optical lens to be constant and obtaining a stable playback signal, is provided. In the flying optical recording/playback head, a device for controlling the relative position between a slider and the optical lens based on a thermal expansion or a piezoelectric effect of an optical lens supporting member for holing the optical lens on the slider, or a thermal expansion of a portion of the optical lens.
Claims17
In a flying optical recording/playback head having a slider for producing buoyancy by a movement of an optical recording medium and an optical element for irradiating light for information-recording and/or playback to the optical recording medium, said flying optical recording/playback head being characterized by comprising a device for controlling the relative position between the slider and a nearest surface as a surface of the optical element which is nearest to the optical recording medium.
In a flying optical recording/playback head having a slider for producing buoyancy by a movement of an optical recording medium and an optical element for irradiating light for information-recording and/or playback to the optical recording medium, said flying optical recording/playback head being characterized in that the optical element has a photo-coupling portion having a flat plane substantially parallel to the surface of the optical recording medium at a side opposing to the optical recording medium, and a device for controlling the relative position between the photo-coupling portion and the slider is provided.
In a flying optical recording/playback head having a slider for producing buoyancy by a movement of an optical recording medium and an optical element for irradiating light for information-recording and/or playback to the optical recording medium, said flying optical recording/playback head being characterized in that the optical element attached to the slider has a flat plane at a light emitting side;
- a cylindrical projection projecting in a cylindrical form is formed in a portion of the flat plane;
- and a thin layer having an electric resistance is formed on the side surface of the cylindrical projection, whereby the distance between the photo-coupling portion comprising the end plane of the cylindrical projection and the optical recording medium is controlled by utilizing a change of the shape of the cylindrical projection due to a thermal expansion, which is caused by supplying power to the thin layer having an electric resistance.
Dependencies are inferred from the claim text.