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Details for Patent: 8,223,610

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Details for Patent: 8,223,610

Title:Apparatus and method for initializing information recording medium, apparatus and method for recording information, and information recording medium
Abstract: An initialization apparatus that has a simplified configuration and that forms an initial hologram in an information recording medium is provided. An initialization apparatus (10) rotates an optical disk (100) and emits blue light beams (Lb1) and (Lb2) to either side of the optical disk (100) while causing a red light beam (Lr1) to follow a track formed in a reference layer (102). Thus, the initialization apparatus (10) can perform an initialization process in which a linear initial hologram IH is formed in a recording layer (101) in a spiral pattern that corresponds to the track formed in a reference layer (102). Accordingly, the initialization apparatus (10) can form a planar initial hologram layer (YH) with significantly reduced optical energy or thermal energy emitted to the optical disk (100) at one time.
Inventor(s): Yamatsu; Hisayuki (Tokyo, JP), Saito; Kimihiro (Saitama, JP), Kobayashi; Seiji (Kanagawa, JP)
Assignee: Sony Corporation (Tokyo, JP)
Filing Date:Feb 05, 2009
Application Number:12/595,012
Claims:1. An information recording medium initialization apparatus for initializing an information recording medium having a recording layer and a reference layer that records information therein through erasing of a preformed initial hologram in the recording layer, comprising: a laser configured to emit an initialization laser beam; a beam splitter configured to split the initialization laser beam into two separate beams; mirrors configured to direct the two separate beams toward opposite sides of the information recording medium; first and second objective lenses configured to focus the two separate beams into two spherical wave recording beams propagating in opposite directions at the same focal point in the information recording medium, forming the initial hologram in the vicinity of the focal point; a focal point moving mechanism configured to sequentially move the focal point along a trajectory at which information is to be recorded later while continuously emitting the two recording beams to form a continuous linear initial hologram; a servo laser configured to emit a servo light beam through the first objective lens to a target track in the reference layer of the information recording medium; a first photodetector configured to convert a servo reflection light beam generated when the servo light beam is reflected by the reference layer into a first received servo light signal; a first servo control circuit configured to move the first objective lens towards or away from the optical information recording medium in response to the first received servo light signal; a second photodetector configured to convert a light beam transmitted through the information recording medium from the second objective lens into a second received servo light signal; and a second servo control circuit configured to move the second objective lens towards or away from the optical information recording medium in response to the second received servo light signal.

2. The information recording medium initialization apparatus according to claim 1, characterized in that the focal point moving mechanism is configured to change a position of the focal point in a virtual plane in the information recording medium.

3. The information recording medium initialization apparatus according to claim 2, characterized in that the focal point moving mechanism is configured to form the linear initial hologram along the trajectory of the focal point in the virtual plane by moving the focal point in the virtual plane with the two spherical wave recording beams focused at the same focal point.

4. The information recording medium initialization apparatus according to claim 2, characterized in that the focal point moving mechanism is configured to move the focal point in the virtual plane in a spiral pattern or in a concentric circle pattern.

5. The information recording medium initialization apparatus according to claim 2, characterized in that the focal point moving mechanism is configured to sequentially form a plurality of the initial holograms arranged along the trajectory of the focal point in the virtual plane by changing the position of the focal point in the virtual plane.

6. The information recording medium initialization apparatus according to claim 2, characterized in that the focal point moving mechanism is configured to form a plurality of layers of the initial hologram by sequentially changing a plurality of the virtual planes in the information recording medium.

7. A method for initializing an information recording medium having a recording layer and a reference layer that records information therein through erasing of a preformed initial hologram in the recording layer, comprising the steps of: providing an initialization laser beam; splitting the initialization laser beam into two separate beams; directing the two separate beams toward opposite sides of the information recording medium; focusing the two separate beams through first and second objective lenses into two spherical wave recording beams propagating in opposite directions at the same focal point in the information recording medium to form the initial hologram in the vicinity of the focal point; and sequentially moving the focal point along a trajectory at which information is to be recorded later while continuously emitting the two recording beams emitting a servo light beam through the first objective lens to a target track in the reference layer of the information recording medium; receiving a servo reflection light beam generated when the servo light beam is reflected by the reference layer and converting it into a first received servo light signal; performing first servo focus control by moving the first objective lens towards or away from the optical information recording medium in response to the first received servo light signal; receiving a light beam transmitted through the information recording medium from the second objective lens and converting it into a second received servo light signal; and performing second servo focus control by moving the second objective lens towards or away from the optical information recording medium in response to the second received servo light.

8. An information recording medium produced by the method of claim 7, characterized in that it comprises a recording layer including an initial hologram continuously formed in a space having a substantially uniform index of refraction along a virtual trajectory.

9. An information recording medium according to claim 8, characterized in that the recording layer includes the initial hologram formed in a predetermined virtual plane.

10. An information recording medium according to claim 9, characterized in that the initial hologram is formed in the virtual plane in a spiral pattern or in a concentric circle pattern.

11. An information recording medium according to claim 9, characterized in that a plurality of layers of the initial hologram are stacked by forming the initial hologram in each of a plurality of the virtual planes that are parallel to one another.
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