公开(公告)号：JP2001023245A

公开(公告)日：2001-01-26

申请号：JP19674699

申请日：1999-07-09

Applicant: SONY CORP

Inventor： KURODA YUJI ,  KIJIMA KOICHIRO ,  ICHIMURA ISAO ,  OSATO KIYOSHI

IPC: G11B7/004 ,  G11B7/135 ,  G11B7/24 ,  G11B7/257 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To provide a recording medium in which disappearance of recorded signals or damages in the optical recording medium due to accumulated heat by irradiation of light can be prevented, and to provide an optical recording device equipped with that medium. SOLUTION: The optical recording medium consists of a substrate 11, reflection film 12 formed on the substrate 11, recording layer 14 formed on the reflection film 12, and first protective layer 15 formed on the recording layer 14, and information is recorded and reproduced by irradiating the recording layer 14 with light from an optical system through the first protective layer 15 side. A light-transmitting heat radiating layer 16 which accelerates diffusion of heat from the recording layer 14 is formed on the first protective layer 15. The optical recording device is equipped with that optical recording medium.

公开(公告)号：JP2001023229A

公开(公告)日：2001-01-26

申请号：JP19674099

申请日：1999-07-09

Applicant: SONY CORP

Inventor： ICHIMURA ISAO ,  KIJIMA KOICHIRO ,  OSATO KIYOSHI

IPC: G11B7/09 ,  G01B7/00 ,  G01B7/14 ,  G01B11/24 ,  G01B11/245 ,  G01B11/30 ,  G01Q20/00 ,  G01Q60/22 ,  G01Q60/46 ,  G01Q80/00 ,  G11B7/135 ,  G01N13/10 ,  G01N13/14

Abstract: PROBLEM TO BE SOLVED: To provide an optical pickup capable of obtaining capacitance corresponding to a distance between an optical system and an optical recording medium. SOLUTION: This optical pickup is provided with a semiconductor laser, an optical system that converges a laser beam from the semiconductor laser to irradiate an optical disk 51, and a light receiving element that photoelectrically converts the laser beam reflected on the optical disk 51. The optical system is provided with an objective lens and a solid immersion lens 3. The objective lens converges the laser beam from the semiconductor laser and supplies it to the solid immersion lens 3. In the bottom of the solid immersion lens 3, the laser beam passing through the objective lens is converged at and passed through a center part 3a the first and second electrodes 6a, 6b are formed nearly concentrically around the optical axis of the solid immersion lens 3 at a peripheral part 3b.

公开(公告)号：JP2001023211A

公开(公告)日：2001-01-26

申请号：JP19652999

申请日：1999-07-09

Applicant: SONY CORP

Inventor： ICHIMURA ISAO ,  KIJIMA KOICHIRO ,  KURODA YUJI ,  YAMAMOTO KENJI ,  OSATO KIYOSHI

IPC: G11B7/095

Abstract: PROBLEM TO BE SOLVED: To provide an optical means for converging a laser beam used to irradiate an optical recording medium, to set a numerical aperture larger by a solid immersion lens, and to highly accurately control the inclination of the solid immersion lens with respect to the an optical axis. SOLUTION: Plural conductive films 6a, 6b, 6c and 6d are formed opposite to an optical disk in the bottom surface part of a solid immersion lens 3, static electricity between these conductive films 6a, 6b, 6c and 6d and an optical disk is detected, the inclination of the solid immersion lens 3 is detected and, based on the result of this detection, the inclination of the solid immersion lens 3 is controlled.

公开(公告)号：JP2001023193A

公开(公告)日：2001-01-26

申请号：JP19509199

申请日：1999-07-08

Applicant: SONY CORP

Inventor： KOCHIYAMA AKIRA ,  KIJIMA KOICHIRO ,  ICHIMURA ISAO ,  OSATO KIYOSHI

IPC: G11B11/105 ,  G11B7/09 ,  G11B7/12

Abstract: PROBLEM TO BE SOLVED: To eliminate the need for applying an AR coat to a cover layer on the recording layer of an optical record medium by forming a magnetic field generation means on a surface that opposes the optical record medium of a lens and forming an electrode for detecting capacitance with respect to the optical record medium. SOLUTION: At least either of a coil part 46 including the take-out electrode of a spiral coil part 46 or a magnetic body core being formed at the lower layer or the upper layer of the coil part 46 via an insulation layer plays a role of an electrode S for detecting capacitance with respect to a magnetooptical disk 2, or the electrode S for detecting the capacitance with respect to the magnetooptical disk 2 is formed independently of the coil part 46 and the magnetic body core. By measuring the capacitance between the electrode and the magnetooptical disk and hence setting the distance between the electrode and the magnetooptical disk to preset distance, the position of an optical element can be adjusted to a position for focusing irradiation light on the recording layer of the magnetooptical disk.

公开(公告)号：JP2000132882A

公开(公告)日：2000-05-12

申请号：JP30419498

申请日：1998-10-26

Applicant: SONY CORP

Inventor： YAMADA MASAHIRO ,  OSATO KIYOSHI

IPC: G11B7/09 ,  G11B11/10

Abstract: PROBLEM TO BE SOLVED: To provide a magneto-optical recording and reproducing device capable of making a swing arm light in weight, shortening access time, and unnecessitating a control circuit and a drive mechanism thereby improving signal quality. SOLUTION: In this magneto-optical recording and reproducing device wherein a laser beam is emitted from a laser light source 3 arranged on a fixed side, and is accessed to a target track on a magneto-optical disk 13 by turning of a swing arm 2, and recording/reproducing information is performed by detecting a signal in accordance with a Kerr-turning angle, 1/4 wavelength plates 5, 9 are arranged on the fixed side and the swing arm 2 side respectively, and an outgoing light beam emitted from the laser light source 3 and a return light beam reflected by the magneto-optical disk 13 are made to pass through the two 1/4 wavelength plates 5, 9.

公开(公告)号：JP2000131603A

公开(公告)日：2000-05-12

申请号：JP30148098

申请日：1998-10-22

Applicant: SONY CORP

Inventor： YAMAMOTO KENJI ,  OSATO KIYOSHI

IPC: G02B13/00 ,  G11B7/00 ,  G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B7/1372 ,  G11B7/1374 ,  G11B7/1378 ,  G11B7/1392

Abstract: PROBLEM TO BE SOLVED: To correct the spherical aberrations by the production errors of optical recording media and lenses, to sufficiently correct chromatic aberrations even when a short wavelength semiconductor laser is used and to also correct the spherical aberrations which occur when using the same optical system for light of different wavelengths by providing the above head with an objective lens having a high numerical aperture of >=0.8. SOLUTION: The optical head has a light source, the objective lens 20 which is composed of >=2 elements of the lenses and has the numerical aperture of >=0.8 and an aberration correction lens group 1 which is arranged between the light source and the objective lens 20 and is composed of two groups; a positive lens group 3 and a negative lens group 2. The aberration correction lens group 1 corrects the spherical aberrations which occur on the respective optical surfaces of the optical system by the spacing between the positive lens group 3 and the negative lens group 2 which is varied in an optical axis direction.

公开(公告)号：JP2000019388A

公开(公告)日：2000-01-21

申请号：JP18491898

申请日：1998-06-30

Applicant: SONY CORP

Inventor： YAMAMOTO KENJI ,  ICHIMURA ISAO ,  MAEDA FUMISADA ,  WATANABE TOSHIO ,  SUZUKI AKIRA ,  OSATO KIYOSHI

IPC: G02B13/00 ,  G02B13/18 ,  G11B7/125 ,  G11B7/135 ,  G11B7/1378 ,  G11B7/1392 ,  G11B11/10

Abstract: PROBLEM TO BE SOLVED: To provide an optical element for correcting chromatic aberration coping with the short wavelength of a light source and an optical pickup device, an optical reproducing device and an optical recording and reproducing device having the optical element for correcting chromatic aberration and coping with the higher recording density and the larger capacity of an optical recording medium. SOLUTION: This optical element for correcting chromatic aberration 1 is disposed between the light source such as a semiconductor laser whose wavelength is =0.55, whose focal distance is >=1.8 mm and whose Abbe number of a (d)-line is =55 and a concave lens 1b whose Abbe number of the (d)-line is

公开(公告)号：JP2000011401A

公开(公告)日：2000-01-14

申请号：JP17922498

申请日：1998-06-25

Applicant: SONY CORP

Inventor： ICHIMURA ISAO ,  KAI SHINICHI ,  KIJIMA KOICHIRO ,  YAMAMOTO KENJI ,  MAEDA FUMISADA ,  OSATO KIYOSHI ,  WATANABE TOSHIO

IPC: G11B7/09

Abstract: PROBLEM TO BE SOLVED: To make a laser beam shorter in wavelength and an optical system higher in aperture and to enable stable and sure focus control by executing focus control by a focus error signal obtd. by synthesizing first and second focus signals varying in a signal level change with respect to a change in a defocus quantity. SOLUTION: The focus error signal TFE is formed by the second focus error signal FE2 of high sensitivity in a small range of the defocus quantity and the signal TFE is formed by correcting the signal level of the first signal FE1 in a wide focus controllable range on the outer region of the focus controllable range of the second signal FE2 at the time of synthesizing the focus error signal TFE in a synthesizing circuit 56. The signal TFE of the high sensitivity and the wide focus controllable range is thus formed by the second signal FE2 of the high sensitivity and the first signal FE1 of the wide focus controllable range in the synthesizing circuit 56. Then, the focus control is executed with the signal TFE.

公开(公告)号：JP2000011388A

公开(公告)日：2000-01-14

申请号：JP17370498

申请日：1998-06-19

Applicant: SONY CORP

Inventor： ICHIMURA ISAO ,  NARAHARA TATSUYA ,  OSATO KIYOSHI

IPC: G11B7/085 ,  G11B7/09 ,  G11B7/125 ,  G11B7/1372 ,  G11B7/1374 ,  G11B7/1392

Abstract: PROBLEM TO BE SOLVED: To provide a device and method for recording/reproducing optical information simultaneously optimizing a distance between two group objective lenses and an offset value in focus control. SOLUTION: The optical information recording/reproducing device is provided with a first electromagnetic actuator 13, a second electromagnetic actuator 15 periodically moving a first lens 12 and a second lens 14 in the optical axial direction and a position control circuit (42) performing focus control drawing at a focus operation time, and adjusting the positions of the first lens 12 and the second lens 14 based on regenerative signals from an optical disk 11 on both ends of the periodical movement by the first electromagnetic actuator 13 and the second electromagnetic actuator 15. Thus, the distance between the first lens 12 and second lens 14 constituting the two group objective lenses and the offset value in the focus control are optimized simultaneously.

公开(公告)号：JPH11110794A

公开(公告)日：1999-04-23

申请号：JP26748897

申请日：1997-09-30

Applicant: SONY CORP

Inventor： MAEDA FUMISADA ,  ICHIMURA ISAO ,  YAMAMOTO KENJI ,  OSATO KIYOSHI ,  WATANABE TOSHIO

IPC: G11B7/135 ,  G11B7/09 ,  G11B7/125 ,  G11B7/1372 ,  G11B7/1378 ,  G11B7/1392

Abstract: PROBLEM TO BE SOLVED: To provide a lens driving device, with which the number of apertures on an objective lens can be increased, spherical aberration can be suppressed and further focus servo can be stably performed at much higher speed. SOLUTION: The lens driving device is composed of a biaxial actuator 5 provided with a movable part freely movable in the direction of an optical axis and orthogonally with that optical axis, voice coil motor 11 provided with a movable part freely movable in the optical axis direction, source ball lens 3, to which light from a light source is made incident, and destination ball lens 4, to which light converged by the source ball lens is made incident. In this case, the voice coil motor 11 is attached to the movable part of the biaxial actuator 5, the source ball lens 3 is attached to the movable part of the voice coil motor 11, and the destination ball lens 4 is attached to the movable part of the biaxial actuator 5.