公开(公告)号：DE10323885A1

公开(公告)日：2004-01-22

申请号：DE10323885

申请日：2003-05-26

Applicant: CANON KK

Inventor： ASAMI MASAYOSHI

IPC: G02B13/14 ,  C30B11/00 ,  C30B29/12 ,  G02B1/02 ,  G02B13/24 ,  H01L21/027 ,  H01S3/02 ,  G03F7/20

Abstract: An apparatus and method for producing a crystal with face-orientation control using a seed crystal being securely performed, and which can advantageously produce a high quality crystal with a large diameter quickly. A crystal-growth crucible movable in the vertical direction is used. While the temperature is being raised, the crucible is kept at a position where all the raw material, i.e., a crystalline substance placed in the crucible, is not melted. After the temperature stabilizes, the crucible moves in a first direction where the temperature becomes higher, so that the whole raw material and a part of the seed crystal melt. Then, the crucible moves in a second direction where the temperature becomes lower, whereby the seed crystal and the molten raw material sufficiently contact each other.

公开(公告)号：JP2001003940A

公开(公告)日：2001-01-09

申请号：JP2000118852

申请日：2000-04-20

Applicant: CANON KK

Inventor： SUMIKURA SUSUMU ,  ISHINO TAKAMICHI ,  ASAMI MASAYOSHI

IPC: F16C17/02 ,  F16C33/10 ,  F16C33/20 ,  G02B26/12 ,  G02B26/10

Abstract: PROBLEM TO BE SOLVED: To prevent the abrasion at the time of low-speed rotation. SOLUTION: A shaft 3 integrated with a rotary polygon mirror 1 is fitted in a sleeve 2 having a dynamic pressure generating groove 2a so as to form a dynamic pressure bearing. An electrodeposition film 22 obtained by dispersing the lubricating filler such as silicon group resin and inorganic particulate is formed on a bearing surface 2b of the sleeve 2 after conducting processing with a chemical conversion coating 21. The bearing surface 2b is formed by electrodeposition easier than the plating, and abrasion resistance and lubricating performance of the bearing surface 2b can be remarkably improved.

公开(公告)号：JP2000330065A

公开(公告)日：2000-11-30

申请号：JP14310499

申请日：1999-05-24

Applicant: CANON PRECISION INC ,  CANON KK

Inventor： NAKASUGI MIKIO ,  NAKAJIMA NOBUO ,  ASAMI MASAYOSHI ,  NISHIDA HIDEYUKI ,  MAEKAWA ICHIRO ,  KUGIOKA MICHIHIRO ,  MASUDA HIROMASA

IPC: B41J2/44 ,  F16C17/02 ,  F16C17/08 ,  F16C33/10 ,  G02B26/10 ,  G02B26/12

Abstract: PROBLEM TO BE SOLVED: To make it possible to decrease stages, etc., to surely prevent the splashing and leaking out of lubricant fluid inexpensively in terms of a cost and to eliminate the possibility of staining optical parts by forming a collar part on an aperture side of an oil sump part with a material having a low surface energy. SOLUTION: When the revolving shaft 3 rotates, the lubricant fluid existing in shallow grooves 9 formed at a sleeve 4 is co-rotated by the centrifugal force of the revolving shaft 3 and the expansion, etc., of the bubbles of the air intruding into the lubricant fluid at the time of assembly and the entire part of the lubricant fluid are caused by the effect of the heat by the rotation. When the lubricant fluid cannot stagnate any more in the oil sump part 13, the lubricant fluid tends to creel the collar part 12 from the oil sump part 13 and to ooze further toward the aperture, but since the collar part 12 is formed of material having low surface energy, the lubricant fluid tending to ooze may be shut off. Even if the lubricant fluid comes into contact with the collar part 12, the lubricant fluid does not leak out to the aperture side from the oil sump part 13 unless the lubricant fluid of the amount exceeding the volume of the oil sump part 13 is physically discharged.

公开(公告)号：JP2000120662A

公开(公告)日：2000-04-25

申请号：JP30948298

申请日：1998-10-15

Applicant: CANON KK ,  CANON PRECISION INC

Inventor： ASAMI MASAYOSHI ,  MIYAZAWA AKIRA

IPC: F16C17/02 ,  F16C17/08 ,  F16C33/10

Abstract: PROBLEM TO BE SOLVED: To secure a stable bearing rigidity of a dynamic pressure fluid bearing by preventing out of lubrication on the bearing surface through restriction of the axially directed motion of the lubricating oil and enhance the durability when the bearing makes a long time rotation. SOLUTION: Herringbone dynamic pressure generating groove patterns 4 and 5 formed on the radial bearing surfaces 2 and 3 in two places about the axial direction on the inside surface of a bearing sleeve or the outside surface of a bearing shaft have a micro-gap in their fitting part differing between two sides about the center in the axial direction of the groove patterns in such a way as enlarging on the side where the patterns 4 and 5 adjoin each other.

公开(公告)号：JPH1193942A

公开(公告)日：1999-04-06

申请号：JP27644497

申请日：1997-09-24

Applicant: CANON PRECISION INC ,  CANON KK

Inventor： SATO KAZUMI ,  NAKASUGI MIKIO ,  ASAMI MASAYOSHI ,  HISAZUMI FUMIHIRO

IPC: F16C17/02 ,  B21H7/18 ,  F16C33/14

Abstract: PROBLEM TO BE SOLVED: To provide a dynamic pressure bearing suitably used for a deflection scanning device by providing a fixed sleeve for making a rotating shaft a dynamic pressure bearing, the fixed sleeve is finish worked by cutting with a diamond tool. SOLUTION: A diamond tool 42 is formed of a shank 40 having an outer diameter slightly smaller than the bore diameter of a fixed sleeve 29 to be worked and a diamond tip 41 brazed to a U-shaped cut-out provided on the tip of the shank 40. The fixed sleeve 29 is chucked on a lathe and finished by cutting with the diamond tool. Consequently, the fixed sleeve 29 can be worked with precision of a cylindricity of 1 μm or less, a roundness of 0.5 μm or less, a dispersion of herringbone groove depth of ± 1 μm or less and a surface roughness of 0.3 μm or less. Thus, a dynamic pressure bearing improved in precision of cylindricity, roundness and surface roughness, and a method for manufacturing a dynamic pressure bearing for deflection scanning device can be provided.

公开(公告)号：JPH10325932A

公开(公告)日：1998-12-08

申请号：JP15046697

申请日：1997-05-23

Applicant: CANON KK

Inventor： ASAMI MASAYOSHI ,  ISHIBE YOSHIHIRO

IPC: G02B26/10 ,  G02B5/18 ,  H04N1/113

Abstract: PROBLEM TO BE SOLVED: To eliminate a windage loss caused by the rotation of a polyhedric mirror based on the shape of the mirror. SOLUTION: Reflection gratings 31a are formed on the deflective side face of a cylindrical body 31 at plural cycles, and a distance is set so that the grating pitch per cycle may counterbalance the power of the cylinder surface in accordance with the light incident angle of the light deflector, and the cylindrical body 31 is made to function as a deflecting element equipped with a deflection surface equivalent to the conventional polyhedric mirror, and each lens power of fθlenses 36 and 37 is adjusted so as to have the conjugate relation in a subscanning direction as for the reflection gratings 31a and a photoreceptor 38, then, the deviation of the image forming point on the photoreceptor 38 is optically counterbalanced.

公开(公告)号：JPH08267129A

公开(公告)日：1996-10-15

申请号：JP9804695

申请日：1995-03-30

Applicant: CANON KK

Inventor： ASAMI MASAYOSHI ,  SAITO NORIHISA

IPC: F16C17/10 ,  B21C37/20 ,  B21D53/10

Abstract: PURPOSE: To manufacture a dynamic pressure bearing provided with a groove for generating dynamic pressure with a high shape accuracy. CONSTITUTION: In grooving in which a dynamic pressure generating groove is formed by pressing the ball 31 of a tool shaft 3 on the inner face of the shaft sleeve W of a dynamic pressure bearing, a hard spherical body is used for the ball 31 with the Vickers hardness 1200 or higher and with the modulus of longitudinal elasticity 250GPa or above, preventing trouble such as the ball 31 is scratched or the sphericity is lowered at the time of attaching the ball 31 to the tool shaft 3, and grooving is thereby performed with a high shape accuracy.

公开(公告)号：JP2003089591A

公开(公告)日：2003-03-28

申请号：JP2001280034

申请日：2001-09-14

Applicant: CANON KK

Inventor： ASAMI MASAYOSHI

IPC: G03F7/20 ,  C30B11/00 ,  C30B29/12 ,  G02B1/02 ,  H01L21/027

Abstract: PROBLEM TO BE SOLVED: To provide a single crystal growing method by which a surface having uniform temperature is realized and a uniform and high quality single crystal can be produced even when the diameter is large. SOLUTION: In the single crystal growing method, an insulating material 4 is arranged in the inside of a housing body 5 constituting a furnace chamber 6, a heater 3 is arranged in the inner side of the insulating material 4, a raw material 7 is melted in a single crystal growing crucible 1 arranged in the inside of the heater 3, and a crystal is grown from the raw material 7 by melting and then cooling the raw material 7. The single crystal is grown while floating, on the surface of the melt, a floating member 14 for sealing a portion or the whole of the surface of the melt in the crucible 1.

公开(公告)号：JP2002130282A

公开(公告)日：2002-05-09

申请号：JP2000324881

申请日：2000-10-25

Applicant: CANON KK ,  CANON PRECISION INC

Inventor： NISHIDA HIDEYUKI ,  ASAMI MASAYOSHI ,  MAEKAWA ICHIRO ,  NAKASUGI MIKIO ,  NAKAJIMA NOBUO ,  KUGIOKA MICHIHIRO ,  MASUDA HIROMASA

IPC: F16C33/10 ,  F16C17/02 ,  H02K7/08

Abstract: PROBLEM TO BE SOLVED: To prevent oil leakage of a dynamic-pressure bearing device. SOLUTION: Oil 6, filled in a bearing gap between a shaft 1 of a dynamic- pressure bearing device and a sleeve 2, has a risk of leaking due to involvement of air into the bearing gap. Then, a tapered section is formed at the edge of an opening of the sleeve 2, and the surface of the section is polished to a mirror- surface finished surface 2d, so as to be non-wettable with respect to oil. An oil drip 6c, creeping up to the edge of the opening, is made to drop to a fluid surface 6d by forming a coarse surface 2e, which is a wettable surface under the non-wettable surface.

公开(公告)号：JP2001082455A

公开(公告)日：2001-03-27

申请号：JP25506999

申请日：1999-09-09

Applicant: CANON KK

Inventor： ASAMI MASAYOSHI

IPC: F16C17/02 ,  F16C33/10

Abstract: PROBLEM TO BE SOLVED: To prevent lubricant from flowing out due to the thermal expansion of the air in a bearing. SOLUTION: A bearing clearance 10 has reservoirs 12 and 16 to minimize the dispersion in the quantity of the lubricant contained in radial bearing sections 13 and 15 and a recess 14, etc., and sealing sections 11 and 17 on the aperture sides of the reservoirs 12 and 16. The throttle sections 2a and 2g of a sleeve 2 forming the sealing sections 11 and 17 are provided with arc-like notches 11a and 17a respectively. Since different shape sections are formed by the notches 11a and 17a, the air in the bearing clearance 10 can be let off without attaching the lubricant having gone into the sealing sections 11 and 17 to all around the peripheries of the sealing sections 11 and 17.