公开(公告)号：JP2001043562A

公开(公告)日：2001-02-16

申请号：JP21941699

申请日：1999-08-03

Applicant: SONY CORP

Inventor： MASUHARA SHIN ,  AKI YUICHI ,  YAMAMOTO KENJI

IPC: G11B7/135 ,  G02B5/04 ,  G02B5/30 ,  G03F7/20 ,  G03F7/207 ,  G11B7/125 ,  G11B7/126 ,  G11B7/1378 ,  G11B7/1392 ,  G11B7/26

Abstract: PROBLEM TO BE SOLVED: To constitute a laser beam source by means of a semiconductor laser and to expose a master disk or the like with high accuracy by arranging the chromatic aberration correcting optical system correcting the chromatic aberration of an ojective lens to an exposing laser beam. SOLUTION: An exposing laser beam LR emitted from the light source unit 51 having a semiconductor laser is emitted to a dichroic mirror 47 via a chromatic aberration correcting optical system 78 and a beam expander 79 by the optical system 44 of an exposing laser beam. Hereupon, the chromatic aberration correcting optical system 78 is composed of the optical system imparting the chromatic aberration to the exposing laser beam LR so as to negate the chromatic aberration. The optical system imparting the chromatic aberration is composed by arranging spaced-apart by the prescribed distance two set of lenses 78A and 78B wherein the convex lens made of crown glass having a positive refractive index is respectively stuck to the concave lens made of flint glass having a high negative refractive index.

公开(公告)号：JP2001023252A

公开(公告)日：2001-01-26

申请号：JP19653099

申请日：1999-07-09

Applicant: SONY CORP

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

IPC: G11B7/12 ,  G11B7/135 ,  G11B7/26

Abstract: PROBLEM TO BE SOLVED: To easily manufacture a master disk and to accurately control an operating distance by providing a conductive film over a whole region to be exposed, which is transparent which respect to light having a wavelength equal to the wavelength which an exposing luminous flux has. SOLUTION: The device for manufacturing a master disk has an optical means consisting of a condenser lens 2 which converges a laser beam L projected from a light source to irradiate a layer 101 of a photosensitive resist applied on an optical master disk base material 51 attached to a disk rotary driving device of the device for manufacturing a master disk and a solid immersion lens(SIL) 3 which is an objective lens interposed between the optical master disk base material 51 and the condenser lens 2. A conductive film 102 formed on the side of the optical master disk base material 51 does not generate reflected light even when a laser beam is focused on the photosensitive resist layer 101 and brings recorded data capacity of higher density comparing with the case using an optical master disk forming a conductive film having metal reflection.

公开(公告)号：JP2001023219A

公开(公告)日：2001-01-26

申请号：JP19503799

申请日：1999-07-08

Applicant: SONY CORP

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

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To prevent the transmission of heat from an objective lens to an optical disk when the objective lens is disposed in a region near the optical disk. SOLUTION: For a solid immersion lens 1, its spherical surface part is set as an incident surface 1a1, on which a laser light L is made incident, and its flat surface part is set as an opposite surface 1b for emitting the laser light L made incident from the incident surface 1a1 toward an optical disk 100, placed opposite to the optical disk 100. This solid immersion lens 1 is disposed by setting a distance between the opposite surface 1b1 and the optical disk 100, equal to 200 nm or lower, having at least a part including the opposite surface 1b1 made of a high heat conductive material, and formed in a dual structure.

公开(公告)号：JPH10188320A

公开(公告)日：1998-07-21

申请号：JP34090496

申请日：1996-12-20

Applicant: SONY CORP

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

IPC: G11B7/135 ,  G11B7/09 ,  G11B7/125 ,  G11B7/1372 ,  G11B7/1374 ,  G11B7/24 ,  G11B11/105

Abstract: PROBLEM TO BE SOLVED: To record or reproduce information in high density by specifying the thickness of an optical disk and integrally performing focus controls of an objective lens and a front lens while making the total numerical aperture of the objective lens and the front lens a value equal to or above a specific value. SOLUTION: When there is a variation in thickness of a substrate 61, a spherical abberation is generated. Then, in the case a two-group lens having a high numerical aperture is used as a lens unit, when the thickness of the substrate 61 is fluctuated remarkably, the quality of a reproduced signal is impaired largely. Since when the thickness of the substrate is thickened too much, the influence due to a skew becomes large, it is desirable to make the thickness of the substrate to be within the range of 0.1mm to 0.3mm and it is made to be =0.8 because the multiple of about 1.8 times is multiplied with respect to the numerical aperture of an incident light.

公开(公告)号：JPH09245391A

公开(公告)日：1997-09-19

申请号：JP5567796

申请日：1996-03-13

Applicant: SONY CORP

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

IPC: G11B11/105 ,  G11B5/02 ,  G11B11/10

Abstract: PROBLEM TO BE SOLVED: To save power and to miniaturize and inghten a device. SOLUTION: A tip ball lens 43 irradiates laser light generated by a semiconductor laser and incident through a prescribed optical system on a prescribed position of a magneto-optical disk 1. A magnetic field modulation coil 42 generates magnetic field answering to a prescribed recording signal to apply it to the irradiative position of the laser light. The magnetic field modulation coil 42 and a radiator 44 are loaded on the periphery of the tip ball lens 43, and since the magnetic field modulation coil 42 is arranged on the position the most suitable for the recording layer of the disk 1 when the laser light is focused, it can apply the magnetic field of sufficient strength by irreducible minimum power.

公开(公告)号：JPH08212579A

公开(公告)日：1996-08-20

申请号：JP1518595

申请日：1995-02-01

Applicant: SONY CORP

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

IPC: G11B11/10 ,  G11B7/09 ,  G11B7/135 ,  G11B11/105

Abstract: PURPOSE: To suppress the occurrence of spherical aberration due to dispersion in thickness of a solid immersion lens and a magneto-optical disk. CONSTITUTION: The magneto-optical disk 1 is irradiated with light converged by an objective lens 41 through a plate 42 and a solid immersion lens 43. A holder 44 holding the objective lens 41 and the plate 42 is focus-controlled and tracking-controlled respectively by a focus actuator 45 and a tracking actuator 46. Further, an SIL actuator 48 is driven corresponding to the change in capacity of a capacitor formed between the holder 44 and the holder 47, and it is controlled so that an interval between the holders 47 and 44 becomes a fixed value.

公开(公告)号：JPH07270946A

公开(公告)日：1995-10-20

申请号：JP8770594

申请日：1994-03-31

Applicant: SONY CORP

Inventor： YAMAMOTO KENJI ,  YOSHIMURA SHUNJI

IPC: G03B31/02 ,  G11B3/76 ,  G11B7/00 ,  G11B7/003 ,  G11B7/004 ,  G11B7/24 ,  G11B20/10

Abstract: PURPOSE:To realize a reproducing device, recording method and recording medium capable of markedly lowering an error rate. CONSTITUTION:The reproducing device 10, recording method and recording medium capable of markedly lowering the error rate are realized by setting the length of the second dots in the arranging directions of the first and second dots larger than the length of the first dots at the time of forming the first dots to allow transmission of light and the second dots to shield the light on the translucent recording medium and recording digital information by combination of the arrangement of the first and second dots and setting the slice level at the time of reproducing the digital information by irradiating the recording medium with light and subjecting the transmitted light to photoelectric conversion by using a photoelectric conversion means 23, at

公开(公告)号：JPS6052612B2

公开(公告)日：1985-11-20

申请号：JP7950779

申请日：1979-06-22

Applicant: SONY CORP

Inventor： SHICHIJO HAJIME ,  YAMAMOTO KENJI

IPC: H04B1/16 ,  H03J1/04 ,  H03J5/02

公开(公告)号：JPS562744A

公开(公告)日：1981-01-13

申请号：JP7950779

申请日：1979-06-22

Applicant: SONY CORP

Inventor： SHICHIJIYOU HAJIME ,  YAMAMOTO KENJI

IPC: H04B1/16 ,  H03J1/04 ,  H03J5/02

Abstract: PURPOSE:To make it possible to display all preset stations immediately and clearly with a simple constitution, by displaying electrically preset stations on a dial display unit. CONSTITUTION:Display unit 7 consists of plural frequency dot display parts and indication display parts provided correspondingly to the frequency scale. Plural preset selection operators are arranged in operation part 1, and receiving frequencies selected by preset are stored in memory unit 10. Frequency dot display parts of unit 7 selected by preset are displayed by the output of unit 10. Here, the arrangement order of displayed frequency dot display parts and the arrangement order of preset channel selection operators are caused to agree with each other. Consequently, all preset stations can be displayed immediately and clearly with a simple constitution.

公开(公告)号：JPS51147104A

公开(公告)日：1976-12-17

申请号：JP7120675

申请日：1975-06-12

Applicant: SONY CORP

Inventor： YAMAMOTO KENJI

IPC: H03J7/18 ,  G01D5/249 ,  H03J5/02 ,  H03M1/22 ,  H04B1/26

Abstract: PURPOSE:Selection device of synthesizer receiver where erroneous operation is eliminated by such arrangement as to write in ?1000? as Gray code corresponding to dicimal digit ''9''.