Hologram recording medium, recording/reproducing method and recording/reproducing apparatus
AssigneePioneer Corporation
InventorMasakazu Ogasawara
Life of this patent
Estimating the term…
Abstract
A hologram recording medium is for recording or reproducing information with light irradiated thereto. The medium has a recording layer made of a photo-sensitive material, a reflective layer disposed on the opposite side of the recording layer from a light irradiated side, tracks formed on the reflective layer such that the tracks are spaced apart by a first pitch from each other to extend without intersection, and positioning marks formed on the reflective layer such that the positioning marks are spaced apart by a second pitch from each other in a direction in which the tracks extend. The second pitch is a function of the first pitch.
Claims15
A hologram recording for recording or reproducing information with light irradiated thereto, comprising:
- a recording layer made of a photo-sensitive material;
- a reflective layer disposed on the opposite side of said recording layer from a light irradiated side;
- tracks formed on said reflective layer such that said tracks are spaced apart by a first pitch from each other to extend without intersection;
- and
- positioning marks formed on said reflective layer such that said positioning marks are spaced apart by a second pitch from each other in a direction in which said tracks extend, said second pitch being a function of said first pitch.
A recording/reproducing apparatus for a hologram recording medium which is carried by a substrate and has a recording layer for recording or reproducing information with light irradiated thereto, wherein:
- said hologram recording medium comprises a recording layer made of a photo-sensitive material, a reflective layer disposed on the opposite side of said recording layer from a light irradiated side, tracks formed on said reflective layer such that said tracks are spaced apart by a first pitch from each other to extend without intersection, and positioning marks formed on said reflective layer such that said positioning marks are spaced apart by a second pitch from each other in a direction in which said tracks extend, said second pitch being a function of said first pitch;
- and
- said recording/reproducing apparatus includes means for irradiating a light beam to detect said positioning marks, and means for moving a position irradiated with said light beam in a direction having a component in a direction in which said tracks extend.
A reproducing apparatus for a hologram recording medium which is carried by a substrate and has a recording layer for recording or reproducing information with light irradiated thereto, wherein:
- said hologram recording medium comprises a recording layer made of a photo-sensitive material, a reflective layer disposed on the opposite side of said recording layer from a light irradiated side, tracks formed on said reflective layer such that said tracks are spaced apart by a first pitch from each other to extend without intersection, and positioning marks formed on said reflective layer such that said positioning marks are spaced apart by a second pitch from each other in a direction in which said tracks extend, said second pitch being a function of said first pitch;
- and
- said reproducing apparatus includes means for irradiating a light beam to detect said positioning marks, and means for moving a position irradiated with said light beam in a direction having a component in a direction in which said tracks extend.
A recording method for a hologram recording medium carried by a substrate and having a recording layer for recording or reproducing information with light irradiated thereto, said method comprising the step of temporally overlapping one or more layers each including a plurality of holograms to record a group of holograms on each of said layers, wherein the holograms are recorded on each of said layers at a density lower than a maximum recording density, wherein:
- said hologram recording medium comprises a recording layer made of a photo-sensitive material, a reflective layer disposed on the opposite side of said recording layer from a light irradiated side, tracks formed on said reflective layer such that said tracks are spaced apart by a first pitch from each other to extend without intersection, and positioning marks formed on said reflective layer such that said positioning marks are spaced apart by a second pitch from each other in a direction in which said tracks extend, said second pitch being a function of said first pitch;
- and
- said method further comprises the steps of irradiating a light beam to detect said positioning marks, and moving a position irradiated with said light beam in a direction having a component in a direction in which said tracks extend, wherein the holograms are sequentially recorded from a site of said recording layer which is least frequently irradiated with light.
Dependencies are inferred from the claim text.