Holographic recording system and optical chopper
AssigneeTDK Corporation
InventorsTakuya Tsukagoshi, Jiro Yoshinari
Life of this patent
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Abstract
A holographic recording system with a simple structure is provided that can make a holographic recording beam follow a recording medium traveling even at high speed. The holographic recording system 10 includes a chopper lens 30 that travels in synchronization with and in a same direction as the holographic recording medium 14. The chopper lens 30 is formed so as to move the axes of incident information and reference beams relative to the recording medium and the chopper lens, and to irradiate them to an identical information recording region 15 in the holographic recording medium 14.
Claims17
A holographic recording system, comprising:
- a light beam irradiation unit for irradiating an information beam and a reference beam so that an interference pattern formed by the information beam and the reference beam can be recorded as a diffraction grating into an information recording region in a holographic recording medium;
- a recording medium moving unit for moving the holographic recording medium with respect to the optical axes of the information beam and the reference beam;
- and
- an optical chopper provided on the optical axes of the information beam and the reference beam between the light beam irradiation unit and the holographic recording medium, the optical chopper moving the optical axes in a same traveling direction as, by substantially a same traveling distance as, and in synchronization with the information recording region, when performing holographic recording into the information recording region by using the information beam and the reference beam.
An optical chopper comprising:
- a chopper disc having a rotatable disc shape and comprising a plurality of ring-shaped regions disposed at different positions in a radius direction;
- and a plurality of chopper lenses that are discretely disposed in the ring-shaped regions in the chopper disc, with an identical length and pitch in a circumference direction, and refracts and transmits a beam incident from one surface of the chopper disc to the other surface thereof,
- wherein the chopper lens is formed such that, when the chopper lens is rotated in a fixed direction at a constant speed together with the chopper disc, an exit optical axis of a laser beam incident from the one surface is refracted so as to take a fixed position in a rotational direction in a specific plane disposed on the other surface.
Dependencies are inferred from the claim text.