公开(公告)号：EP1732068A4

公开(公告)日：2007-08-29

申请号：EP05727289

申请日：2005-03-25

申请人： SONY CORP

发明人： TOISHI MITSURU ,  OKADA HITOSHI ,  TANAKA TOMIJI

IPC分类号： G03H1/26 ,  G11B7/0065 ,  G03H1/28 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135

CPC分类号： G11B7/0065 ,  G03H1/28 ,  G11B7/00772 ,  G11B7/128

摘要： There is provided a hologram recording device capable of easily performing multiplex recording and reproduction to/from a hologram recording medium. The hologram recording device includes: an optical system for focusing a signal light modulated by an optical modulation element and a reference light phase-modulated by a phase modulation element substantially to the same place; and a distance control mechanism for controlling the distance between the phase modulation element and the hologram recording medium. By controlling the distance between the phase modulation element and the hologram recording medium, it is possible to perform multiplex recording to the hologram recording medium. In an ordinary phase-correlation multiplex method, multiplex recording is performed by shifting the focusing position in the surface direction of the hologram recording medium. As compared to this, the present invention can perform multiplex recording without requiring shift in the surface direction. By performing shift in the surface direction of the hologram recording medium, it is possible to further increase the recording capacity. In this case, the shift amount can have a margin as compared to the ordinary phase-correlation multiplex.

公开(公告)号：EP1361572A4

公开(公告)日：2007-10-31

申请号：EP02711432

申请日：2002-02-08

申请人： SONY CORP

发明人： TANAKA TOMIJI ,  NAKAO SHINICHI ,  ENDOH SOHMEI ,  ISHII TAMOTSU

IPC分类号： G11B7/24 ,  G11B7/007 ,  G11B7/085 ,  G11B7/09 ,  G11B7/095 ,  G11B11/105

CPC分类号： G11B11/10563 ,  G11B7/08505 ,  G11B7/0903 ,  G11B7/0943 ,  G11B7/24079 ,  G11B11/10576

摘要： A device and a method for judging the advancing direction, along a disk radius direction, of a light spot formed on the signal recording surface of an optical disk comprising two type of grooves having different depths formed along the recording tracks formed of lands. A judging unit judges the advancing direction of a main spot based on the binarized data of the difference signal of a main spot and the binarized data of the difference signal of a side spot, thereby it is possible to judge the advancing direction of a light spot with respect to a disk radius direction only by difference signals without using a sum signal.

公开(公告)号：EP1691458A4

公开(公告)日：2007-09-05

申请号：EP04799951

申请日：2004-11-30

申请人： SONY CORP

发明人： TANAKA TOMIJI ,  TAKAHASHI KAZUO ,  TAKEYA MOTONOBU

IPC分类号： H01S5/14 ,  H01S5/00 ,  H01S5/022 ,  H01S5/065 ,  H01S5/22 ,  H01S5/323 ,  H01S5/343

CPC分类号： H01S5/141 ,  H01S5/02212 ,  H01S5/02248 ,  H01S5/02296 ,  H01S5/02415 ,  H01S5/02438 ,  H01S5/0655 ,  H01S5/2219 ,  H01S5/32341

摘要： There is provided an external resonator type semiconductor laser having a greater output or more preferable single-mode characteristic than the conventional external resonator type semiconductor laser. The external resonator type semiconductor laser includes a laser diode (11), a window glass (16), a grating, and a lens and has some improvements. The first improvement is that the window glass (16) is inclined by a predetermined angle with respect to the light emitting surface (19) of the laser diode (11). The second improvement is that arrangement of the laser diode (11) and the like is adjusted so that the S wave is applied to the grating. The third improvement is that the laser diode (11) is configured so that generation of kink is suppressed when the output power is 45 mW or below. The other improvements are to set the reflectance of the light emitting surface of the laser diode (11), the numerical aperture of the lens, the length of the external resonator, and the primary light reflectance in the grating to optimal values, respectively.