公开(公告)号：JPH0793791A

公开(公告)日：1995-04-07

申请号：JP26290293

申请日：1993-09-27

Applicant: SONY CORP

Inventor： IWAASA SHIYOUJI

IPC: G11B11/10 ,  G11B7/12 ,  G11B11/105 ,  G11B33/14

Abstract: PURPOSE:To obtain an optical pickup capable of minimizing the unwanted radiation of a high frequency wave by making gaps to be hardly generated and enlarging fitting force. CONSTITUTION:This optical pickup is for reproducing information on an information recording medium and for recording information onto the information recording medium. The pickup has a shielding case made so as to enclose a high frequency wave generating source 104 by fitting a first member 30 with a second member 32 and the edge part of the first member 30 and the edge part of the second member 32 are formed to be uneven cross-sectional shapes.

公开(公告)号：JPH05325250A

公开(公告)日：1993-12-10

申请号：JP15756192

申请日：1992-05-25

Applicant: SONY CORP

Inventor： KOBAYASHI YOSHIHEI ,  IWAASA SHIYOUJI ,  KATOU YOSHIMUNE ,  KASHIWAGI HIROSHI

IPC: G11B7/12 ,  G11B7/135 ,  G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To simplify assembling work and further to miniaturize the entire shape of an optical pickup itself as to the optical pickup for a magneto-optical disk recording and reproducing device. CONSTITUTION:An optical block 40 and an objective lens part 50 are separately formed, and optical parts are integrally held by an optical base 32 and an objective lens part base 44, respectively. They are held by setting one reference plane H3 of a specified holding member 42 as reference. Furthermore, a guide shaft is formed so that its moving direction may be perpendicular to the optical axis of a light beam L1 between a laser light source 10 and a beam splitter 16.

公开(公告)号：JPH03185649A

公开(公告)日：1991-08-13

申请号：JP32312389

申请日：1989-12-13

Applicant: SONY CORP

Inventor： ISHIDA MINORU ,  IWAASA SHIYOUJI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To seek at high speed by supporting a magnet which constitutes a magnetic circuit part which moves and scans a magnetic field generating means in a separation direction to the main surface of a magneto-optical disk, cooperating with a coil for driving attached to a continuous means, by an attachment base plate. CONSTITUTION:A magnetic field generator which becomes a magnetic field generating means is connected to an optical pick-up device 4 with a support arm 11 which becomes a connecting means and supports, and is placed opposite to an objective lens 4a with a magneto-optical disk. A coil 12 for driving attached to the support arm 11 cooperates with a magnet 13 and a magnetic yoke 14 supported by an attachment base plate 1b and constitutes a magnetic current part which operates to move the magnetic field generation device 10 in the separation direction to the main surface of the magneto-optical disk 3. Thus, the magnet 13 which cooperates with the coil 12 for driving to constitute the magnetic circuit part 15 which operates the motion of the magnetic field generating means 10 is supported by the attachment base plate, so this magnetic field circuit part never becomes the load to the moving of the optical pickup. Thus, the high speed seeking becomes possible.

公开(公告)号：JPH02198403A

公开(公告)日：1990-08-06

申请号：JP1839089

申请日：1989-01-27

Applicant: SONY CORP

Inventor： IWAASA SHIYOUJI

IPC: G02B7/02

Abstract: PURPOSE:To surely fix a lens to a lens barrel with a simple structure by inserting a holding ring having an engaging part having elasticity in the lens barrel, and engaging the engaging part to a part to be engaged of the lens barrel. CONSTITUTION:In the case of inserting a plastic lens 11 consisting of a synthetic resin formed body into a lens barrel 10 and fixing it, first of all, the lens 11 is inserted into the lens barrel 10. The peripheral edge part of the lower face of the lens 11 is received by a stepped part 12. A holding ring 15 is inserted from the upper face of its part. Subsequently, a claw 17 of an engaging piece 16 of the holding ring 15 is hooked to an opening 13 for constituting a part to be engaged of the lens barrel 10, by which the lens 11 is held and fixed by the lens barrel 10 and the holding ring 15. In such a manner, the lens can be fixed easily with the simple structure, and also, by using the holding ring of a low cost, and also, the lens can be removed in accordance with necessity.

公开(公告)号：JPH0756076A

公开(公告)日：1995-03-03

申请号：JP22378793

申请日：1993-08-17

Applicant: SONY CORP

Inventor： SHIBUYA KAZUO ,  IWAASA SHIYOUJI

IPC: B29D11/00 ,  G02B7/02 ,  G11B7/135

Abstract: PURPOSE:To provide a mltilens holder designed to be rapidly and exactly worked by few stages and the working method therefor. CONSTITUTION:While a blank having a prescribed outside shape relative to an axial direction is turned around the optical axis, a cylindrical groove 13 around the axial direction and a lens housing part 12 of a diameter corresponding to the diameter of an optical path 11 and the multilenses are formed thereon by lathing and finally a part 16 at the end of this blank is so removed as to allow a rising part 17 corresponding to the D cut of the multilenses to remain, by which the multilens holder 10 is formed.

公开(公告)号：JPH04341973A

公开(公告)日：1992-11-27

申请号：JP11271991

申请日：1991-05-17

Applicant: SONY CORP

Inventor： MAEDA TAMOTSU ,  IWAASA SHIYOUJI

IPC: G11B19/20 ,  F16C17/10

Abstract: PURPOSE:To suppress focus resonance, and to improve performance by providing a dynamic pressure groove bearing between the stator and the rotor of an optical disk drive spindle motor, and separating the stator and the rotor by a lubrication film layer at the time of rotation. CONSTITUTION:When a driving coil 16 is energized, and a shaft 21 is rotated, the pumping pressure of a spiral groove provided at a thrust bearing plate 24 overcomes the suction force of pre-loading magnets 17,20, and the shaft 21 is floated above the plate 24. Besides, the lubrication film layer is formed in a gap between the shaft 21 and radial bearing sleeves 22, 23 by the pumping action of herring-bone grooves 25, 26, and load is supported by the generated pressure. Accordingly, the shaft 21 is separated perfectly, and the vibration of the stator can be prevented from being transmitted to the shaft 21 and a turntable 27 side.

公开(公告)号：JPH04251455A

公开(公告)日：1992-09-07

申请号：JP41711890

申请日：1990-12-28

Applicant: SONY CORP

Inventor： IWABUCHI KIETSU ,  IWAASA SHIYOUJI

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To improve the radiation ability of a magnetic field modulation type magnetic head, to prevent trouble caused by the increase in a temperature and to improve yield at the magnetic field modulation type magneto-optical drive device. CONSTITUTION:A movable base 4 is provided to be slightly displaced perpendicularly to a magneto-optical recording medium face while being fitted with a magnetic field modulation type magnetic head 1, and the movable base 4 and a mobile object to fix the base are equipped with a coil, to which the displacement control signal current of the movable base 4 is supplied, and a magnetic field generating means. Then, the heat conductivity of the movable base 4 is selected higher than 6.1X10 cal/cm-.sec. deg.C.

公开(公告)号：JPH04206057A

公开(公告)日：1992-07-28

申请号：JP33835290

申请日：1990-11-30

Applicant: SONY CORP

Inventor： IWABUCHI KIETSU ,  IWAASA SHIYOUJI ,  HIKICHI TORU

IPC: G11B11/10 ,  G11B11/105

Abstract: PURPOSE:To avoid the contact between a magnetic head and a magneto-optical recording medium and to improve productivity and yield by arranging the magnetic head and damper members protruding from an optical sensor on the surface of a magneto-optical drive facing the magneto-optical recording medium. CONSTITUTION:A magnetic head 1 and an optical sensor 2 are provided on a movable substrate 4 so as to face a surface 3A of a magneto-optical recording medium 3. A winding part IC such as a coil is provided in a protruding pattern on the surface of the upper surface of the magnetic head 1. A light emitting and receiving part 2P having a laser diode and photodetector and the like is provided on the upper surface of the optical sensor 2. At this time, damper members 13 are provided on the edge part of the light emitting and receiving part 2P on the side of the magnetic head 1 and the edge part on the opposite side at the positions which do not close the light emitting and receiving part 2P of the optical sensor 2. Thus, the damage of the magnetic head 1 is avoided, and the decrease in yield rate can be suppressed.

公开(公告)号：JPH11110799A

公开(公告)日：1999-04-23

申请号：JP27136997

申请日：1997-10-03

Applicant: SONY CORP

Inventor： NEMOTO HIROAKI ,  IWAASA SHIYOUJI

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To positively fix an optical pick-up device and at the same time prevent a beam splitter plate from falling and being fluctuated even if a slide base generates creep by pinching the slide base and the beam splitter plate with a clipping member consisting of an elastic plate material. SOLUTION: A beam splitter plate 41 consists of a glass member of a thin parallel flat plate, passes outward light from a semiconductor laser 22 as it is, and changes inward light being reflected by a magnetooptical disk by 90 degrees. A clipping member 52 consists of a square thin leaf spring material with elasticity as in a stainless steel plate and is bent at two points in the longer direction of the square and hence is formed in U shape. In manufacturing, the beam splitter plate 41 is slid along a fixed wall 53 being provided at a slide base 20 and is arranged at the specified position of the slide base 20, and the base part of the beam splitter plate 41 and the fixed wall 53 are overlapped, are pinched, and fixed at the U-shaped opening of the clipping member 52.

公开(公告)号：JPH09320097A

公开(公告)日：1997-12-12

申请号：JP13184396

申请日：1996-05-27

Applicant: SONY CORP

Inventor： IWAASA SHIYOUJI ,  SATO KATSUTOSHI ,  TAKEMOTO YOSHIKI

IPC: G11B7/135

Abstract: PROBLEM TO BE SOLVED: To offset coma aberration of a flat plate and correct astigmatism of light source secure defocusing tolerance and improve field characteristic by arranging a first and a second plat plates with the inclination direction opposite to each other. SOLUTION: A first parallel flat plate cover glass 3 is arranged with a predetermined inclination angle to the optical axis of laser emitted from a semiconductor laser chip 2 as the light source. Thereby, astigmatism of the light beam emitted from the chip 2 can be compensated. A aberration compensating plate 4 which will become the second parallel flat plate is arranged with the predetermined inverse inclination angle to the inclination direction of glass 3 for the transmitting optical axis of the glass 3. With inverse inclination position of the glass 3 and compensating plate 4, the coma aberration generated by these elements is canceled to control the amount of coma aberration. Accordingly, astigmatism generated by chip 2 can be corrected without increase in amount of generation of coma aberration. Therefore, an error rate during reading of information signal can be controlled and tolerance for defocusing of objective lens can be secured and moreover, field characteristic can be improved through control of coma aberration.