Panasonic Corporation

Shohei Inoue

Hideaki Horio

Taiichi Mori

Syougo Horinouchi

Shogo Horinouchi

Kouichi Bairin

Tetsuya Araki

A plate body, multiple hologram layersare provided in the thickness direction of the plate body, and at least one of the multiple hologram layersis formed of spirally continuous hologram bands. Erasure areasA andB and non-erasure areasC andD of the hologram bandare provided in the length direction of the hologram band. Non-erasure areasE andF of the hologram bandare formed on both sides in the direction orthogonal to the length direction of the hologram bandin the erasure areasA andB.

Record medium, optical disk unit using it, and recording method

The recording and reproducing apparatus has rotary drive unit (a motor) that rotationally drives a multilayer recordable recording medium; a reference-light-side recording and reproducing lensand a recording-light-side recording and reproducing lensthat are disposed oppositely to the recording mediumwhich is rotationally driven by the rotary drive unit, an address detection lensthat is disposed opposite the recording mediumand that is provided separately from the recording and reproducing lensesand; a light sourcefor recording and reproducing purpose that supplies recording reproduction light to the recording and reproducing lensesand; and the address light sourcethat supplies address light to the address detection lens. The apparatus is configured in such a way that light whose center axis portion is optically hollow is supplied from the reference-light-side recording and reproducing lensto the recording mediumduring reproducing operation.

Recording and reproducing apparatus

Then, in order to achieve the above-described object, in the optical disk of the present invention, while micro-hologram layersandmade of plural layers are provided in an inner portion of a plate bodyalong a thickness direction of the plate body, dimensions of micro-hologramsalong the thickness direction of the plate body, which configure the micro-hologram layerformed on the side of one surface of the plate bodywithin the micro-hologram layersandconstructed of the plural layers, are made smaller than dimensions of micro-hologramsalong the thickness direction of the plate body, which configure a micro-hologram layerformed on the side of an inner layer of the plate body

Optical disk, recording/reproducing method thereof, and optical disk apparatus with employment of optical disk

A holographic recording apparatus causes reference light and information light to interfere with each other, and records the interference pattern in a recording medium. The holographic recording apparatus has an objective lens and a focus position controller. The objective lens focuses both the reference light and the information light at a focus position of the recording medium. The focus position controller changes the focus position into a predetermined position on the light path of the reference light.

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Fukuoka, Japan

Shohei Inoue