公开(公告)号：JP2003021773A

公开(公告)日：2003-01-24

申请号：JP2001208498

申请日：2001-07-09

Applicant: Sony Corp ,  ソニー株式会社

Inventor： MAEDA FUMISADA ,  NAGASHIMA SHINICHI

IPC: G02B7/02 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To constitute an objective lens of a plurality of lenses, to accurately adjust relative positions between lenses and to maintain the accuracy of the relative positions between the lenses even when ambient temperature is changed. SOLUTION: The cylindrical lens holder 3 holding a plurality of lenses 1 and 2 has an air vent part 3c connecting a void part between the respective lenses 1 and 2 to the outward side of the lens holder 3.

Abstract translation: 要解决的问题：为了构成多个透镜的物镜，为了精确地调节透镜之间的相对位置，并且即使当环境温度改变时也保持透镜之间的相对位置的精度。 解决方案：保持多个透镜1和2的柱面透镜保持器3具有将透镜1和2之间的空隙部分连接到透镜保持器3的外侧的通气部3c。

公开(公告)号：JPH11353700A

公开(公告)日：1999-12-24

申请号：JP15297298

申请日：1998-06-02

Applicant: SONY CORP

Inventor： FUKUMOTO ATSUSHI ,  KAI SHINICHI ,  MAEDA FUMISADA

IPC: G11B11/10 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To obtain satisfactory reproduced signals while making crosstalk small at the time of reproducing information signals from a magneto-optical recording medium on both of whose land and groove information signals are recorded and to miniaturize a device while enhancing the degree of freedom of a constitution. SOLUTION: An optical 10 reproducing information signals from a magneto- optical recording mediumon on both of whose land and groove information signals are recorded is provided with a light source 11 irradiating the magneto- optical recording medium with light beams, an objective lens 14 converging the light beams from the light source 11 on the recording medium and a phase difference changing means 15 which is arranged between a beam splitter 13 separating the light beams from the light source 11 and return lights from the recording medium and the objective lens 14 and the optical head 10 makes amounts of changes of phase differences by the phase difference changing means 15 to be different amounts in the return light from the land of the recording medium and in the return light from the groove of the medium.

公开(公告)号：JPH11190818A

公开(公告)日：1999-07-13

申请号：JP35820997

申请日：1997-12-25

Applicant: SONY CORP

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

IPC: G02B13/00 ,  G02B13/18 ,  G11B7/135

Abstract: PROBLEM TO BE SOLVED: To provide an objective lens whose numerical aperture NA is large, also, capable of suppressing the occurrence of wave front aberration, and also, to attain high-density recording on an information recording medium and to attain the information recording medium of large capacity. SOLUTION: The objective lens 1 for an optical head used in the case of recording/reproducing on/from the information recording medium 2 is constituted of at least two or more lenses. And, the numerical aperture NA is controlled to be >=0.7, an incident pupil diameter is controlled to be >=1 mm to =3.5 μm to

公开(公告)号：JPH10255303A

公开(公告)日：1998-09-25

申请号：JP5216097

申请日：1997-03-06

Applicant: SONY CORP

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

IPC: G11B7/135 ,  G11B7/1372 ,  G11B7/1374 ,  G11B7/22

Abstract: PROBLEM TO BE SOLVED: To control aberration within a tolerance without incorporating a special device even in the case of thickness errors in a two-group lens. SOLUTION: In the two-group lens consisting of the first lens 13, constituted of the first face 15 on which a laser beam emitted from a semiconductor laser is made incident and the second face 16 which emits the incident laser beam from the first face 15 to the second lens 14, and the second lens 14 constituted of the third face 17 on which a luminous flux emitted from the second face 16 is made incident and the fourth face 18 which emits the incident luminous flux from the third face 17 to an optical disk arranged oppositely to the third face; a space between the first face 15 and the fourth is used as a reference for positioning.

公开(公告)号：JPH10188301A

公开(公告)日：1998-07-21

申请号：JP34090396

申请日：1996-12-20

Applicant: SONY CORP

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

IPC: G11B7/00 ,  G11B7/085 ,  G11B7/09 ,  G11B7/12 ,  G11B7/122 ,  G11B7/135 ,  G11B7/1372 ,  G11B7/1374

Abstract: PROBLEM TO BE SOLVED: To accurately effect a focus servo on an optical disk having high desity recording capacity. SOLUTION: An objective lens 27 is held by a lens holder 71, while a front lens 28 held by a lens holder 73 is held via an actuator 74 by the lens holder 71. After the objective lens 27 and the front lens 28 are integrally focus- controlled by an actuator 72, a fine adjustment of the front lens 28 in its position relative to the objective lens 27 in the focus direction is performed by the actuator 74.

公开(公告)号：JPH1090113A

公开(公告)日：1998-04-10

申请号：JP26781396

申请日：1996-09-18

Applicant: SONY CORP

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

IPC: G01B9/02 ,  G01M11/00

Abstract: PROBLEM TO BE SOLVED: To highly accurately evaluate performance of a large numerical aperture(NA) lens by providing a reference wavefront generation means which generates a reference wavefront to interfere with a wavefront to be detected which runs an incident optical path in an opposite direction after being reflected at a reflecting means and passes again a lens to be detected. SOLUTION: A laser beam 11 is reflected at a polarizing reflecting face 13a of a polarization beam splitter(PBS) 13, runs along an optical axis 12 in a forward direction and penetrates a 1/4 wave plate 15 to be a circularly polarized light. The light passing the 1/4 wave plate 15 is reflected at a face 16a to be a reference wave R1 . The wave further penetrates a plane plate 16 and becomes a parallel light T1 . The parallel light T1 is refracted at a plane 19b to be a spherical wave-like wavefront and reaches a convex face 19a. The wavefront in a range S provided for reflection is directly reflected and consequently returns an original optical path to be a parallel plane wave again, which penetrates the plane plate 16, etc., and reaches a screen 21. A light and shade pattern because of an interference of the reference wave R1 and a wave R2 to be detected is projected onto the screen 21, and imaged by a CCD 22.

公开(公告)号：JPH08221790A

公开(公告)日：1996-08-30

申请号：JP2656295

申请日：1995-02-15

Applicant: SONY CORP

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

IPC: G11B7/12 ,  G11B7/135

Abstract: PURPOSE: To realize a high-density reproducing, to make the allowable value of warpage at the time of molding a disk and warpage caused by moisture absorption large, and to increase the yield in production and the degree of freedom in selecting disk material. CONSTITUTION: The surface of a semi-spherical lens 9 opposed to an optical disk 20 is a plane 9b, and the refractive index of the lens 9 is set to a specified value. A slider 12 fixes the lens 9 and slides on the optical disk 20. A leaf spring 13 presses and supports the slider 12 so as to slide on the optical disk 20.

公开(公告)号：JPH08221772A

公开(公告)日：1996-08-30

申请号：JP2656395

申请日：1995-02-15

Applicant: SONY CORP

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

IPC: G11B7/09 ,  G11B7/125 ,  G11B7/135 ,  G11B7/1374 ,  G11B7/1392

Abstract: PURPOSE: To realize a high density reproduction, to reduce the spherical aberration occurring on a signal recording surface of an optical recording medium and to enhance the reproducing characterstics. CONSTITUTION: A semispherical lens 7 is provided with a plane 7b confronted with a light incident surface 20a of an optical disk 20, and is a convex lens, a refractive index of which is set in a prescribed value. A converging optical system 23 converges reflected light from the light incident surface 20a and the plane 7b. A PD 15 detects the reflected light R2 from the plane 7b through the converging optical system 23. A PD 19 detects the reflected light from the plane 76 through the converging optical system 23. A subtracter 21 detects a positional relation between the light incident surface 20a and the plane 7b based on the detection output Pb of the PD 15 and the detection output Pc the PD 19. An actuator 31 for the semispherical lens drives the semispherical lens 7 in the direction of the optical disk 20 or an objective lens 6 so as to control the gap of an air layer AG between the light incident surface 20a and the plane 7b based on the output Pb -Pc of the substracter 21.

公开(公告)号：JPH0798881A

公开(公告)日：1995-04-11

申请号：JP24545193

申请日：1993-09-30

Applicant: SONY CORP

Inventor： MAEDA FUMISADA ,  MATSUMOTO YOSHINORI

IPC: G11B7/125 ,  H01S5/00 ,  H01S3/18

Abstract: PURPOSE:To surely set the prescribed temperature even under the high environmental temperature with a compact and simple structure by arranging 1st and 2nd Peltier elements in superposition. CONSTITUTION:A Peltier element 21 is arranged so that one pole thereof is brought into thermal contact with the substrate in a light source part 1, and a Peltier element 21 is arranged so taht a low-temp. side pole thereof is brought into close contact with the other pole of the Peltier element 21 in superposition. A heat sink 3 formed with many heat radiating fins at the high-temp. side pole of the Peltier element 22 is thermally coupled and densely arranged. As for the short-wavelength laser light which is converted and emitted from the nonlinear optical element is bent, for example, the light pass thereof is bent by the mirror, and the laser light is introduced to the outside of a package 105 through the window of the package 105, passed through the objective lens of the objective lens driving device, and then focused on the optical disk.

公开(公告)号：JPH06301426A

公开(公告)日：1994-10-28

申请号：JP8638593

申请日：1993-04-13

Applicant: SONY CORP

Inventor： MAEDA FUMISADA

IPC: G02F1/37 ,  G05D23/20 ,  H01S3/109

Abstract: PURPOSE:To vary the temperature of the solid element more securely and precisely by providing a coating body which covers the periphery of the solid element and is made of a material having larger heat conductivity than the solid element. CONSTITUTION:The solid element 1 is covered with the coating body 2 made of the material which has larger heat conductivity than the solid element 1. Denoting the temperature of fluid, e.g. air at the periphery of the solid element 1 as TA, a control target temperature as TB, and the temperature of the solid element 1 as TC, heat conduction is caused between the solid element 1 and fluid when TCnot equal to TA, to cause heat movement in the solid element 1 and when the heat conductivity of the solid element 1 is specially low, a high temperature gradient is generated. Namely, the temperature variation of the fluid surrounding the solid element 1 causes the temperature of the solid element itself to become unstable. For the purpose, the coating body 2 is only provided to reduce the influence of the temperature rise of the fluid at the periphery of the solid element 1 and the temperature variation of the solid element 1 itself can greatly be suppressed.