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1. (WO2014208283) HOLOGRAM-RECORDING OPTICAL MODULE AND HOLOGRAM RECORDING DEVICE

Pub. No.:    WO/2014/208283    International Application No.:    PCT/JP2014/064594
Publication Date: Thu Jan 01 00:59:59 CET 2015 International Filing Date: Tue Jun 03 01:59:59 CEST 2014
IPC: G11B 7/135
G03H 1/04
G11B 7/0065
Applicants: KONICA MINOLTA, INC.
コニカミノルタ株式会社
Inventors: MATSUURA Atsushi
松浦 農
Title: HOLOGRAM-RECORDING OPTICAL MODULE AND HOLOGRAM RECORDING DEVICE
Abstract:
 In order to reduce the size of a device while suppressing a reduction in hologram recording density, a hologram-recording optical module is provided with a holding unit for holding a recording medium, a first lens system, and a lens barrel for holding the first lens system; provided with a signal light lens for focusing a signal light incident on the first lens system upon the recording medium, a second lens system, and a lens barrel for holding the second lens system; and provided with a reference light lens for irradiating, with a reference light incident on the second lens system, a portion of the recording medium upon which the signal light is focused. The distance along a first optical axis from a vertex, on the recording-medium-side surface, of the lens closest to the recording medium and included in the first lens system to the surface of the recording medium is shorter than the distance along a second optical axis from a vertex, on the recording-medium-side surface, of the lens closest to the recording medium and included in the second lens system to the surface of the recording medium, and the signal light lens is provided on the opposite side from the second optical axis against a standard reference light.