Patent ID: 7333253
Filing Date: 2008-02-19
Classification: G03H,G11B,G11C

Abstract:
1. A multiple record type hologram record apparatus comprising: a light source for performing an irradiation with source light including signal light and reference light; a spatial light modulator disposed in an optical path of the signal light and capable of modulating the signal light; an optical system for introducing the signal light after passed through said spatial light modulator and the reference light onto a hologram record medium; a move device for moving a focus position of the signal light and the reference light introduced by said optical system, relative to the hologram record medium in a direction along a surface of the hologram record medium; a parameter set device capable of changing and fixing a predetermined kind of parameter for multiple recording for at least one of the signal light and the reference light; and a control device for controlling said parameter set device to perform a recording by using the parameter used for the last recording at the m-th focus position, m is a natural number, as the parameter for the first recording at the (m+1)-th focus position.