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公开(公告)号：JPH02195519A
公开(公告)日：1990-08-02
申请号：JP1441589
申请日：1989-01-24
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU , UCHIYAMA SHOICHI
Abstract: PURPOSE:To allow the position of an image point to be moved while a lens consisting of a diffraction grating structure is held fixed and to shorten access time by constituting the above mechanism of the above-mentioned lens and a light source which varies the oscillation wavelength by a wavelength varying means provided on the outside of a semiconductor laser. CONSTITUTION:The lens, such as micro Fresnel lens, having the diffraction grating structure is moved in the position of its image point in the optical axis direction by the wavelength of incident light. For example, the light from the semiconductor laser 101 is assumed to be condensed to the image point 103 if the wavelength of this light is the same as the design wavelength of the micro Fresnel lens 102. The image point 104 of the light of the wavelength shorter than the design wavelength moves in the direction parting from the lens if the above-mentioned light is assumed to be made incident on such micro Fresnel lens from the semiconductor laser 101. Conversely, the image point 105 moves in the direction proximate to the lens if the light of the long wavelength is made incident. The position of the image point is, therefore, changed by combining the light source of the variable oscillation wavelength and the lens having the diffraction grating structure and varying the oscillation wavelength of the light source. The access time is shortened in this way.
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公开(公告)号：JPH0283228A
公开(公告)日：1990-03-23
申请号：JP23681288
申请日：1988-09-21
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU , UCHIYAMA SHOICHI , TAKEUCHI TETSUHIKO , ITO YOSHITAKA
Abstract: PURPOSE:To obtain in a series of processes an optical element with holographic element and refractive index-distributed element integrated by transferring a texture through sol-gel method along with adding a process to provide refractive index distribution during the process to sintering. CONSTITUTION:A sol 13 is cast into a mold 11 in which diffraction grating pattern 12 consisting partly of equally spaced straight lines 2mu in period and 0.8mu in depth has been formed. This sol is then gelled, dried and sintered to obtained a sintered gel 14. Thence, the surface of this gel 14 is covered with a masking material, but an opening 18 for dopant diffusion is freed from the masking material 15. This gel 14 is then put into a solution 17 prepared by dissolving tetraethoxygermanium in ethanol to form a Ge-diffused region 19 in the gel 14 followed by carrying out sintering, thus obtaining the objective optical element with a diffraction grating 21 and a refractive index-distributed lens 22 formed on one surface and the other surface of a silica glass 20, respectively.
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公开(公告)号：JPH01243257A
公开(公告)日：1989-09-27
申请号：JP6841288
申请日：1988-03-23
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU
IPC: G11B7/135 , G11B11/10 , G11B11/105
Abstract: PURPOSE:To reduce the constitutive parts and to enable the high speed access in miniaturization and light weight by passing a beam from a semiconductor laser through a diffraction grating, converging upon a recording medium by an objective lens and forming a recording light spot and a reproducing light spot. CONSTITUTION:The beam from the semiconductor laser 102 is converged upon the recording medium 109 formed on the surface of a transparent substrate 114. A reflected beam from the medium 109 is diffracted by the diffraction grating 105, and 1st order diffraction beams 110a and 110b are incident upon photo diodes 111a and 111b. The front faces of these diodes are bonded with polarizing plates 112a and 112b respectively. Then, the beam from the laser 102 is linearly polarized by a polarizing plate 103, and the polarizing direction of its reflected beam is rotated by the direction of recorded magnetization on the medium 109. By this method, a signal recorded on the medium 109 is thus detected out.
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公开(公告)号：JPH01204230A
公开(公告)日：1989-08-16
申请号：JP2718688
申请日：1988-02-08
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU , UCHIYAMA SHOICHI
Abstract: PURPOSE:To shorten an access time to a desired track by obtaining a semiconductor laser, an optical path converting element, which forms an optical spot, and an objective lens, etc., as main constituting elements and moving only the optical path converting element and objective lens to a recording medium. CONSTITUTION:Focusing is executed by putting the couple of lens 103, 105 and 107 between a semiconductor laser 102 and an objective lens 111 and displacing one of the lenses in an optical axis direction. In an optical pick-up, an enclosure 101, which includes the semiconductor laser 102, a photo-diode 115 and an actuator 119 for the focusing and tracking of optical spots 113 and 122, etc. is fixed to an information recording and reproducing device. When the optical spots 113 and 122 are sent to a desired track 116 in the recording medium, only the optical path converting element, which causes an optical axis vertical to the recording medium, and objective lens 111 are sent. Thus, since the weight required for moving can be made light, the access time to the desired track 116 can be made shorter than the conventional access time.
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公开(公告)号：JPS6454218A
公开(公告)日：1989-03-01
申请号：JP21108887
申请日：1987-08-25
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU
Abstract: PURPOSE:To suppress effect of external noises, by dividing light from a photodetector with a diffraction grating in three directions to detect changes in the quantity of light in three directions with a light receiving element as caused by motion of a slit train. CONSTITUTION:Light from a semiconductor laser 11 is made parallel with a lens 109 and an optical path is bent with a reflection type diffraction grating 107 and divided into beams 201-203 in three directions. As passing through a slit, the beam thus divided in three directions is dislocated in the optical path with a mirror 108 to enter a lens 112 on the detection side, linked to an optical fiber 113 and, then, enters a photodetector located outside an encoder 115 to be fetched as signal. This eliminates electric wire in the perimeter of the encoder 115, thereby getting rid of counting error otherwise caused by effect of electrical external noise.
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Patent Agency Ranking
公开(公告)号：JPS6451334A
公开(公告)日：1989-02-27
申请号：JP20476687
申请日：1987-08-18
Applicant: SEIKO EPSON CORP
Inventor： UCHIYAMA SHOICHI , YOKOYAMA OSAMU
Abstract: PURPOSE:To produce an optical element by a sol-gel process to realize a refractive index distribution simply and conveniently and with high controllability by using dry gel or a porous sintered body obtd. by sintering the dry gel. CONSTITUTION:Dry gel or a porous sintered body 1 obtd. by sintering said dry gel having a desired shape is produced by gelling a soln. of a hydrolyzate of at least one kind of metal alkoxide and drying the gel, or by sintering the dry gel. A photosensitive resin 2 contg. an organometallic compd. dissolved therein is coated on the surface of the dry gel or the porous sintered body, and the photosensitive resin 2 is exposed through a mask 3 having a desired pattern, and the resin 2 is developed. An optical element 5 having a zone 4 of high refractive index is obtd. by sintering and vitrifying the dry gel or the porous sintered body 1 having the pattern of the resin 2 on the obtd. surface. in this sintering stage, the organometallic compd. is transformed to an oxide and left on the surface of the gel body, but diffused into the inside of the gel body as the temp. is raised since the dry gel or the sintered body is porous. The degree of diffusion is controlled by the pore size of the porous body, etc. If faster diffusion is required, dry gel is adopted, and if slower diffusion velocity is required, a porous sintered body having a desired pore size is adopted.
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公开(公告)号：JPS6430035A
公开(公告)日：1989-01-31
申请号：JP18471387
申请日：1987-07-24
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU
IPC: G11B7/135
Abstract: PURPOSE:To reduce the size and weight of a titled pickup by forming a lens of a transparent substrate and patterns formed on both faces of the transparent substrate. CONSTITUTION:The objective lens 14 is formed of the interference patterns of the exit light from a semiconductor laser 10 and the convergent light to a recording medium 17 on the recording medium 17 side surface of the glass substrate and a beam splitter 13 is formed of the interference patterns of the exit light from the semiconductor laser 10 and the convergent light to a photodetecting element 11 on the semiconductor laser 10 side surface of the glass substrate 12. These interference patterns are formed by exposing the photoresist coated on the surface of the substrate 12 by an electron beam. Just 3 pieces of the required parts are thereby necessitated and the need for a heavy housing is eliminated. The size and weight of the pickup are thus reduced.
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公开(公告)号：JPS63282706A
公开(公告)日：1988-11-18
申请号：JP11825187
申请日：1987-05-15
Applicant: SEIKO EPSON CORP
Inventor： NOBUNAGA HISASHI , YOKOYAMA OSAMU , UCHIYAMA SHOICHI
IPC: G02B6/13 , C01B33/157 , G02B6/12
Abstract: PURPOSE:To greatly improve the mechanical strength of a dry gel body by hydrolyzing a soln. of >=1 kinds of metal alkoxides to form a gel and impregnating an org. resin into the pinholes of the dry gel body formed in such a manner. CONSTITUTION:Si(OC2H5)4 is hydrolyzed and is gelatinized by bringing a mold 13a having an expanded pattern of a desired shape into contact therewith and adjusting the pH thereof. The gel is then removed from the mold 13a and is dried for 7 days to remove ethanol, by which the dry gel body 14 is obtd. This body is put into a basket 17 and the basket is put into a UV curing acrylic resin as an impregnating liquid 16. The resin is packed into the pinhole parts of the gel body 14 by executing evacuation to a vacuum and thereafter, UV rays are projected thereto to cure the body. The mechanical strength of the dry gel body 14 is thereby greatly improved so that the gel body can be effectively utilized for a light guide and circuit grating.
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公开(公告)号：JPS61240416A
公开(公告)日：1986-10-25
申请号：JP8174285
申请日：1985-04-17
Applicant: SEIKO EPSON CORP
Inventor： YOKOYAMA OSAMU
Abstract: PURPOSE:To reduce the time required for forming a protective film by forming a magnetic head and then forming the protective film on the magnetic head with molten glass. CONSTITUTION:An Al2O3.TiC substrate 101 on which a magnetic head 102 is formed is placed on a substrate supporting stand 108. Prior to the melting of glass, Ar is introduced from a valve 107 and the substrate is reversely sputtered by a high-frequency electric power source 104 to enhance the adhesion of glass. Then a glass rod 201 is placed on the substrate 101 by a glass rod supplying device and the surface of the substrate 101 is heated by an infrared heater 105. At this time, the inside of a vacuum vessel 106 is evacuated to prevent the generation of air bubbles. When the temp. is impressed, the substrate supporting stand 103 is rotated in a DC magnetic field and the anisotropic magnetic field of a soft magnetic film can be kept low. After the temp. is impressed, waviness can be seen on the surface of the glass layer. Accordingly, the surface is ground to obtain the glass layer having specified thickness.
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公开(公告)号：JPS6187211A
公开(公告)日：1986-05-02
申请号：JP19746984
申请日：1984-09-20
Applicant: Seiko Epson Corp
Inventor： SHIMIZU NOBUO , INOUE KUNIHIRO , YOKOYAMA OSAMU
IPC: G11B5/31
CPC classification number: G11B5/3163
Abstract: PURPOSE:To prevent the breaking of wiring at the 1st layer magnetic pole edge part by using a transparent substrate and exposing a transparent substrate from its reverse sueface, and thus forming a resist pattern for lifting off a magneticpole step burying film. CONSTITUTION:The transparent substrate is used and exposed from its reverse surface to form the resist pattern for lifting off the 1st layer magntic pole step burying film. For example, a magnetic pole film 2 is formed on a sapphire substrate 1 and etched by using resist 3, mask 4, and light 5 to form the 1st layer magnetic pole 6. The resist 3 is peeled off. Resist 12 is applied over the 1st layer magnetic pole 6 and the reverse surface of the sapphire substrate 1 is exposed to light 14 through the 1st layer magnetic pole pattern 6 as a mask. Then, the resist pattern 13 for lifting off the 1st layer magnetic pole step burying film is formed by development. Silicon oxide is sputtered to the same thickness with the 1st layer magnetic pole to form the 1st layer magnetic pole step burying film 7.
Abstract translation: 目的：通过使用透明基板防止第1层磁极边缘部分的布线断裂，并将透明基板从其反面曝光，从而形成用于剥离磁极步进掩埋膜的抗蚀剂图案。 构成：将透明基板从其反面使用并露出，形成用于剥离第一层金属极阶埋层的抗蚀剂图案。 例如，在蓝宝石基板1上形成磁极膜2，通过使用抗蚀剂3，掩模4和光5进行蚀刻，形成第1层磁极6.将抗蚀剂3剥离。 抗蚀剂12施加在第一层磁极6上，并且蓝宝石衬底1的反面通过第一层磁极图案6作为掩模暴露于光14。 然后，通过显影形成用于剥离第一层磁极阶梯掩埋膜的抗蚀剂图案13。 氧化硅与第一层磁极溅射至相同的厚度，形成第一层磁极阶埋层膜7。
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