Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: A tuning fork type piezoelectric vibrator is provided with vibrating arms which can improve shock resistance while suppressing a CI value to a small value. A first groove (base end side) and a second groove (tip side) extend along a longitudinal direction from a base end of the vibrating arm and are formed on at least one of a front surface or a back surface of the vibrating arms. Then, a ratio L2/L1 which is the ratio of a length L2 of the first groove to a length L1 from the base end of the vibrating arm to the tip of the second groove, is set between 0.35 and 0.65, and a ratio d/L1 which is the ratio of a space d between the first groove and the second groove to the length L1 from the base end of the vibrating arm to the tip of the second groove, is set between 0.010 and 0.016.

Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: In order to provide a tuning fork type piezoelectric vibrator provided with vibrating arms which can improve shock resistance while suppressing a CI value to a small value, a first groove (base end side) and a second groove (tip side) extending along the longitudinal direction from the base end of the vibrating arm and divided into two in the longitudinal direction are formed on at least one of a front surface or a back surface of the vibrating arms. Then, a ratio L2/L1 which is the ratio of the length L2 of the first groove to the length L1 from the base end of the vibrating arm to the tip of the second groove, is set between 0.35 and 0.65, and a ratio d/L1 which is the ratio of a space d between the first groove and the second groove to the length L1 from the base end of the vibrating arm to the tip of the second groove, is set between 0.010 and 0.016.

Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: A tuning fork-type crystal vibrator is provided that has improved CI and shock resistance. The tuning fork-type crystal vibrator includes a tuning fork-shaped crystal element made of a pair of tuning fork arms having grooves in their principal surfaces, and a tuning fork base portion from which the pair of tuning fork arms extends, an outer shape of the tuning fork-shaped crystal element being processed by etching. The tuning fork-type crystal vibrator has a protrusion, formed due to anisotropy of said etching, on a +X surface of the lateral faces of the tuning fork-shaped crystal element, and a first slanted portion rising from a ?X direction in a +X direction formed in a tuning fork slit. A tip of the tuning fork slit on a principal surface side is shifted in +X direction from a center line bisecting the tuning fork-shaped crystal element in a width direction to a position at which tuning fork vibrations of the pair of tuning fork arms are balanced.

Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: A tuning fork type quartz crystal unit has a base and a pair of arms extending from respective ends of the base in a crystallographic Y direction of quartz crystal. Each of the arms comprises a first crystal member and a second crystal member which extend in the Y direction. The first crystal member and the second crystal member are joined to each other in a crystallographic YZ plane by a direct bonding such that the first crystal member and the second crystal member have respective crystallographic X directions oriented away from each other and extending parallel to each other. Each of the arms has excitation electrodes disposed respectively on a pair of exposed surfaces thereof which lie in the YZ plane. The direct bonding comprises, for example, a siloxane bond by which the first crystal member and the second crystal member are joined to each other.

Abstract: A tuning fork-type crystal vibrator is provided that has improved CI and shock resistance. The tuning fork-type crystal vibrator includes a tuning fork-shaped crystal element made of a pair of tuning fork arms having grooves in their principal surfaces, and a tuning fork base portion from which the pair of tuning fork arms extends, an outer shape of the tuning fork-shaped crystal element being processed by etching. The tuning fork-type crystal vibrator has a protrusion, formed due to anisotropy of said etching, on a +X surface of the lateral faces of the tuning fork-shaped crystal element, and a first slanted portion rising from a ?X direction in a +X direction formed in a tuning fork slit. A tip of the tuning fork slit on a principal surface side is shifted in +X direction from a center line bisecting the tuning fork-shaped crystal element in a width direction to a position at which tuning fork vibrations of the pair of tuning fork arms are balanced.

Abstract: A tuning fork type quartz crystal unit has a base and a pair of arms extending from respective ends of the base in a crystallographic Y direction of quartz crystal. Each of the arms comprises a first crystal member and a second crystal member which extend in the Y direction. The first crystal member and the second crystal member are joined to each other in a crystallographic YZ plane by a direct bonding such that the first crystal member and the second crystal member have respective crystallographic X directions oriented away from each other and extending parallel to each other. Each of the arms has excitation electrodes disposed respectively on a pair of exposed surfaces thereof which lie in the YZ plane. The direct bonding comprises, for example, a siloxane bond by which the first crystal member and the second crystal member are joined to each other.

Abstract: This invention provides a metal sheet pressing method of precision-pressing a metal sheet, wherein after a metal sheet (1) is partially drawn so as to form a perforated portion (1a), the perforated portion (1a) is heated by baking and after it is heated by baking, the perforated portion (1a) is pressed with press dies into an uneven-surface shape.

Abstract: An integral bimorph angular rate sensor is formed by directly bonding two tuning fork members in the thickness direction to enhance the detecting sensitivity of the angular velocity sensor. The individual tuning fork members are formed from a single crystalline piezoelectric material such as quartz and are bonded in the crystal axis direction as to establish a piezoelectric phenomenon wherein the piezoelectric materials of the bonded tuning fork members have inverse polarities in their width or thickness directions.

Abstract: A cassette container case including a casing having rotation-preventing projections formed thereon, a lid having a pocket portion for receiving a magnetic tape cassette pivotally connected to the casing in such a manner that the lid and the casing can be opened and closed like a door, recesses for receiving a thick portion of a magnetic tape cassette being formed in open sides of the lid and casing, and an index card attached to the index card covering the lid except for a region opposed to the recess which receives the thick portion of the cassette. In another embodiment, the index card includes a flap that covers the opening of the cassette through which the tape can be accessed.

Abstract: An oxide superconductor of the formula: Bi.sub.1.0 Sr.sub.A Ca.sub.B Mg.sub.C Ba.sub.D Cu.sub.1.0.+-.0.15 O.sub.X wherein A=0.6-1.3, B=0.3-0.9, C=0.01-0.3 and D=0.01-0.3 in atomic ratio, having a 2212 phase with a critical temperature of making electrical resistance zero at about 80K or more, can be produced by firing preferably at 820.degree.-870.degree. C. in a lower oxygen content atmosphere.

Abstract: The present invention provides an oxide superconductor which is mainly composed of bismuth, lead, strontium, calcium, magnesium, and copper and has the composition represented by the formula:Bi.sub.1-A Pb.sub.A Sr.sub.1-B Mg.sub.B Ca.sub.1 Cu.sub.1.7.+-.0.3 Oxwherein A=0.15-0.35 and B=0.05-0.3 in which numerals represent atomic ratio and an oxide superconductor which is mainly composed of bismuth, lead, strontium, calcium, magnesium, barium and copper and has the composition represented by the formula:Bi.sub.1-A Pb.sub.A Sr.sub.1-(B+C) (Mg.sub.B Ba.sub.C)Ca.sub.1 Cu.sub.1.7.+-.0.3 Oxwherein A=0.15-0.35, B=0.05-0.3 and C=0.02-0.2 in which numerals represent atomic ratio. Methods for producing these superconductors are also provided.

Abstract: A superconducting thick film circuit board or thick film superconductor obtained by forming a rod-like crystal superconducting composite layer comprising a superconductor made of a compound of M-Ba-Cu-O, M being Y and/or a lanthanide element, and a composite of Ag and Pt on a stabilized zirconia substrate has a high Jc value and good superconducting properties.