Abstract: A preform used as a reinforcement of a composite product is formed by heating a homogeneous slurry mixture of oxide type ceramic particles and/or oxide type ceramic whiskers which are reactive with magnesium (Mg) and a metal oxide having standard energy of formation equal to or less than a magnesium oxide (MgO) or an inorganic compound formed by decomposing the metal oxide to sinter the oxide type ceramic particles and/or oxide type ceramic whiskers.

Abstract: A piezoelectric oscillator unit maintains the adhesive force of a quartz vibrator package with respect to a circuit substrate even when the solder connecting the quartz vibrator package to the circuit substrate melts. This prevents the vibrator package from lifting from or falling off of the circuit substrate. In this piezoelectric oscillator unit, a quartz vibrator housing a quartz member is overlaid on a box-shaped circuit substrate on which an oscillating circuit, a temperature compensation circuit, or other circuits are mounted. The electrodes provided on the four corners of the top surface of the circuit substrate and the electrodes provided on the four corners of the bottom surface of the quartz vibrator are bonded together using solder, and also the circuit substrate and the quartz vibrator are mechanically coupled by an adhesive.

Abstract: A compact quartz oscillator includes a quartz vibrator that is integrally mounted on a circuit substrate. In the quartz oscillator, flux residue can be easily washed away. A cavity is defined in the approximate center of the circuit substrate. Within the cavity, circuit components defining an oscillation circuit, a temperature-compensating circuit, and other such circuits are surface-mounted preferably via reflow soldering. Connection electrodes are disposed at the four corners of walls surrounding the cavity. The connection electrodes are bonded to electrodes of the quartz vibrator mounted on the circuit substrate preferably via reflow soldering. Recesses are provided in the top surfaces of the walls. With the recesses, clearances are created between the circuit substrate and the quartz vibrator. As a result, in order to wash away flux residue.

Abstract: A quartz oscillator is constructed to achieve a better yield when being mass-produced, by providing a margin of strength for each of the substrates thereof while reducing the thickness of the quartz oscillator devices. A box-shaped circuit substrate is provided for mounting thereon circuit components having different heights from one another. The bottom plate of a recess in this circuit substrate has a level difference, and is constituted of a region where the thickness of the bottom plate is relatively larger and a region where the thickness of the bottom plate is relatively smaller. High-profile circuit components are mounted on the region where the thickness of the bottom plate is smaller, while low-profile components are mounted on the region where the thickness of the bottom plate is larger. By thus increasing the thickness of one portion of the bottom plate of the circuit substrate, the bending strength of the circuit substrate is improved.

Abstract: To present a disk loading device reduced in the thickness of the entire device, capable of loading plural types of cartridge and bare disk commonly, easy to handle in horizontal or vertical position, and particularly excellent in dust-proof performance or manual insertion and discharge performance of tray in power off state, a holder 100 moved back and forth by transfer means provided inside includes a detecting switch 114 of a shutter opener 103 and a detecting switch 115 of a disk holder 104, and these two detecting switches are combined, while a dust-proof member such as dust-proof cover 42 is provided in a passage to the disk and optical head 7 in an external air stream in the device, and therefore, immediately after putting the media into the holder 100, the type and state of the media can be detected, and breakage of device due to insertion of plural types of cartridge in wrong direction or wrong side can be prevented, and also contamination of the disk or optical head 7 by suction of dust or smoke can

Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.

Abstract: A method is provided for producing a preform structure which is used in a composite aluminium or aluminium alloy component in which a base metal of an aluminium or aluminium alloy is reinforced with reinforcing materials. A slurry is prepared by mixing reinforcing materials including ceramic particles and first whiskers with burning-away powders and liquid. Liquid components contained in the slurry are filtered to provide a dehydrated structure. Thereafter a preform structure is produced by sintering the ceramic particles with the first whiskers after burning the burning-away powders in the dehydrated structure.

Abstract: This invention is to provide a magnesium alloy cast material capable of manufacturing a wheel, a large-sized forged piece such as wheel having properties equivalent to those of aluminum molten forged member, directly from the state of continuous cast material. The magnesium alloy cast material is a nearly intermediate alloy composition between conventional AZ61 alloy and AZ80 alloy, comprising Al: 6.2 to 7.6 wt. %, Mn: 0.15 to 0.4 wt. %, Zn: 0.4 to 0.8 wt. % and Mg: balance, and casting by defining the mean crystal grain size under 200 .mu.m. The forgeability is excellent, and when forged, a forged piece superior in mechanical properties and corrosion resistance to the aluminum molten forged member can be manufactured.

Abstract: A metallic porous product is produced by applying a slurry of a mixture of skeleton constituent metal particles and property modifying particles to an inflammable porous foam, burning the inflammable porous foam having open pores by heat to provide a metallic skeleton structure, and sintering the metallic skeleton structure.

Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.

Abstract: A method for preparing a light metal or light metal alloy composite product, wherein (a) an aqueous slurry containing water, a reinforcement powder, a metal powder and an alumina sol binder is prepared; (b) a preform is prepared from the slurry; (c) the preform is sintered; and (d) the sintered preform is impregnated with a melt of a light metal or a light metal alloy to produce a light metal or a light metal alloy based composite product.

Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil and/or ether oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.

Abstract: Trays for reproduction-only media and trays for recordable and reproducible media are individually fixed in a single magazine and the recordable and reproducible media are protected by making ejection difficult, thereby providing an auto-changer and a magazine for dual-purpose use or mixing of the reproduction-only media and the recordable and reproducible media. A tray (27a) and a tray (27b) stored in a magazine (21) are fixed to the magazine (21) by respective locking member. A magazine holder (53) of the auto-changer is provided with a release lever (49) and a release layer (50) which are assisted by a release spring (51) and a release spring (52), respectively When the magazine (21) is inserted into the magazine holder (53), the locking member (47) and the locking member (48) are pushed by the release levers, respectively, whereby the lock of the trays (27a) and (27b) in the magazine (21) is released, and the trays (27a) and (27b) can be freely taken out of the magazine (21).

Abstract: An article of manufacture made of a magnesium alloy is made by casting the magnesium alloy to provide a billet, forging the billet to render material of the billet to have an average crystalline particle size of not greater than 100 .mu.m; and carrying out a T6 treatment (a solution treatment and an artificial aging treatment) with respect to the billet. Physical properties such as, for example, the tensile strength, elongation and the like of the article are considerably improved by virtue of the synergistic effect of the micronized crystalline particles and the T6 treatment.

Abstract: An automatic disk changer has a recording/reproducing device capable of operating a reproducing-only disk and a recording/reproducing possible disk, disk trays that can be placed on the recording/reproducing device, and each of which has a disk-type discriminating means able to discriminate as to whether the disk could be a reproducing-only disk or a recording/reproducing possible disk, a tray storage holding the disk trays, and a tray carrier able to pullout/insert the disk trays from/into the tray storage and able to transport the disk tray to/from the recording/reproducing device.

Abstract: In an automatic medium changing apparatus capable of storing a multiplicity of optical disks, the control parameters required for the drive control system of a drive unit for recording-reproducing are automatically regulated for all the combinations of the existing drive units and all the media held. The resulting values of the control parameters are stored in a control unit of the automatic medium changing apparatus and the apparatus is controlled by the corresponding control parameters transferred from the control unit at the time of processing the medium.

Abstract: This invention relates to a method for producing a magnesium light alloy product. In order to enhance formability in plastically forming a magnesium alloy material and obtain high tensile strength and high proof stress in the final product, the magnesium alloy material is cast by using molten magnesium alloy containing strontium of 0.02 to 0.5 weight percent and then plastically formed into a magnesium light alloy product in set shape.

Abstract: The manufacturing method of plastically formed products prevents the generation of cracks at the time of plastic working, thereby increasing the productivity. It is also prevented that the metallic particles constituting the product become large and rough in structure. In the manufacturing method, only the compact treatment and the vacuum deaeration treatment are carried out prior to the extrusion treatment, without the pressure-heat treatment performed. Therefore, processing steps prior to the extrusion treatment are simplified, so that the productivity of the plastically formed products is improved and the metallic particles are prevented from being large and rough. The diffusion treatment between the extrusion treatment and the forging treatment enhances the adhesion at the inner part of the extruded material in the radial direction, whereby the generation of cracks at the time of plastic working is avoided.

Abstract: A method for producing a magnesium light alloy product. In order to enhance formability in plastically forming a magnesium alloy material and obtain high tensile strength and high proof stress in the final product, the magnesium alloy material is cast by using molten magnesium alloy containing strontium of 0.02 to 0.5 weight percent and then plastically formed into a magnesium light alloy product in set shape.

Abstract: A liquid injection type scroll compressor is used to a refrigerating apparatus using hydrocarbon fluoride refrigerant which does not contain chlorine (HFC-125/HFC-143a/HFC-134a) as an operating fluid and an amount of an injected liquid is controlled according to a discharge temperature of the compressor. Further, ester oil is used as refrigerator oil and a dryer is disposed in a refrigerating cycle. With this arrangement, a refrigerating cycle operation can be stably realized in a wide range without almost changing the arrangement of a conventional refrigerating apparatus.