公开(公告)号：JP2002293609A

公开(公告)日：2002-10-09

申请号：JP2001095673

申请日：2001-03-29

Applicant: NGK INSULATORS LTD

Inventor： KURASHINA MITSURU ,  NIIMI TOKUICHI ,  YAMAGUCHI HIROFUMI

IPC: C04B35/00 ,  B28B1/26 ,  C04B35/115 ,  C04B35/632 ,  H01J61/30

Abstract: PROBLEM TO BE SOLVED: To provide a ceramic polycrystal body having thermal resistance capable of being used as a light emitting tube and a relatively high linear transmissivity of >=8%, and to provide a method of producing the same. SOLUTION: The ceramic polycrystal body 4 has a crystal structure of triclinic, monoclinic, orthorhombic, tetragonal, trigonal or hexagonal system, an average particle size of 5 to 50 μm, and a linear transmissivity of >=8%.

公开(公告)号：JP2001273871A

公开(公告)日：2001-10-05

申请号：JP2000086159

申请日：2000-03-27

Applicant: NGK INSULATORS LTD

Inventor： KURASHINA MITSURU ,  ASANO OSAMU ,  ASAI MICHIO

IPC: C03B20/00 ,  H01J61/30

Abstract: PROBLEM TO BE SOLVED: To provide a luminous tube for a high-intensity discharge lamp which is suitable for mass production and accurate in dimension, and a method of manufacturing it. SOLUTION: First, silica powders with average particle diameter of 1 μm and 8 μm are blended (S1), then a binder and water are added to produce a clay (S1, S2). After an extrusion blow molding of the produced clay (S3) and a burning for 5 hr at a temperature of 500 deg.C (S4), the burned body is dipped in a slurry which is produced by the same blend as the silica powders of clay (S5). After the burning of the dipped burned body, a final firing is given at a maximum temperature of 1650 to 1750 deg.C.

公开(公告)号：JPH11283503A

公开(公告)日：1999-10-15

申请号：JP8118198

申请日：1998-03-27

Applicant: NGK INSULATORS LTD

Inventor： KURASHINA MITSURU ,  ASAI MICHIO

IPC: H01J9/24 ,  H01J61/30

Abstract: PROBLEM TO BE SOLVED: To sufficiently remove blackening of an insertion member of yttrium, aluminum, garnet or yttria powder with adequate transparency, in the manufacturing of a discharge vessel. SOLUTION: Granules are made by granulating yttrium, aluminum, garnet or yttria powder, and a main body forming body 11 is obtained form the granules. On the other hand, yttrium, aluminum, garnet or yttria powder is temporarily baked, the temporarily baked body is granulated to make granules, and capillary forming bodies 12a and 12b with an outer diameter smaller than an opening diameter of the main body forming body 11 are obtained from the granules. An assembly body 13 is then formed by inserting the capillary forming bodies 12a and 12b in the opening parts of the main body forming body 11 respectively, and is baked temporarily. The temporarily baked body 14 is then regular backing is conducted under a reducing atmosphere, and annealing is applied to the regular baked body 15.

公开(公告)号：JPH07202284A

公开(公告)日：1995-08-04

申请号：JP24165394

申请日：1994-10-05

Applicant: NGK INSULATORS LTD

Inventor： TAKEUCHI YUKIHISA ,  KIMURA KOJI ,  KURASHINA MITSURU

IPC: B41J2/045 ,  B06B1/06 ,  B41J2/055 ,  G01N11/00 ,  G01N11/16 ,  H01L29/84 ,  H01L41/08 ,  H01L41/09

Abstract: PURPOSE:To realize a stable element wherein displacement, force, etc., to an opposite direction of a cavity can be acquired stably and generated displacement and increased volume inside the cavity hardly change even if a formation position of a piezoelectric/electrostriction operational part is shifted. CONSTITUTION:A non-piezoelectric/electrostriction operational part is provided on an outer surface of a thin part 5a on a cavity 5b formed in a ceramic substrate 5 to acquire a piezoelectric/electrostriction film type element 1 which is formed by forming piezoelectric/electrostriction operational parts 2, 3 in a specified range of a circumference of the non-piezoelectric/electrostriction operational part.

公开(公告)号：JPH03263780A

公开(公告)日：1991-11-25

申请号：JP6060190

申请日：1990-03-12

Applicant: NGK INSULATORS LTD

Inventor： ISHIKAWA KAZUO ,  KURASHINA MITSURU

IPC: H05B3/16 ,  H01C17/28 ,  H01C17/30 ,  H05B3/20

Abstract: PURPOSE:To obtain a ceramic heater free from an irregular resistance value and with a high product yield by setting a wetter atmosphere in the temperature condition wherein the resistance value of a resistor falls within a desired range. CONSTITUTION:A pre-wetter process 2 is applied to a ceramic board 10 passing a kiln 16 during a temporary baking process 4, and a post-wetter process 3 is applied thereto during a final baking process 5. Also, a temperature condition in each process is varied, thereby removing a binder and carbon from ceramic in the prewetter process 2, and increasing bonding strength between the ceramic board 10 and a resistor 12 in the post-wetter process 3. In addition, the color adjustment of the ceramic board 10 is made. Also, the resistance value of the resistor 12 changes by the adjustment of the temperature atmosphere of the post-wetter process 3. Consequently, the resistance value of the resistor 12 can be maintained at a desired value by controlling the temperature conditions of the wetter processes 2 and 3.