Abstract: In the semiconductor device, an opening 3 having a high aspect ratio is made from the back surface of a GaAs substrate 1 by anisotropic dry etching. After an Au film 4 is deposited on the entire back surface of the Gabs substrate inclusive of the inside of the opening 3, the entire back surface is subjected to Ni alloy non-electrolytic plating so that an Ni film 9a can be also deposited on the inner wall and bottom of the opening 3 can be obtained. An IC substrate or FET with the Ni film 9a left only at the area corresponding to a via hole. The back surface of the IC substrate or FET and the front surface of a package substrate are bonded to each-other by AuSn solder having poor wetting for the Ni film 9a.

Abstract: In a semiconductor device, an opening having a high aspect ratio extends from a back surface of a GaAs substrate and is formed by anisotropic dry etching. After an Au film is deposited on the entire back surface of the GaAs substrate, including inside of the opening, a Ni alloy is non-electrolytically plated. The Ni film can also be deposited on the inner wall and the bottom of the opening. An IC substrate or FET may have the Ni film only at an area corresponding to the via hole. The back surface of the IC substrate or FET and the front surface of a package substrate are bonded to each other by AuSn solder poorly wetting the Ni film.

Abstract: Inorganic media for barrel finishing produced by sintering a media green body formed from a mixed material comprising clay fine grains as a binder, abrasive grains and aluminum hydroxide fine grains as a brittleness imparting agent. The inorganic media is excellent in finishing performance, with which rough finishing can be conducted by dry barrel finishing.

Abstract: In a method for doping with beryllium, when epitaxially growing a III-V compound semiconductor, (MeCP).sub.2 Be is employed as a dopant source. Since (MeCP).sub.2 Be has a lower vapor pressure than diethylberyllium (DEBe) which is conventionally employed as the dopant source doping control is facilitated. In addition, since (MeCP).sub.2 Be having a higher purity than DEBe is easily obtained, impurities such as oxygen are not incorporated into the active layer during doping, whereby a high quality p type layer is realized.

Abstract: In a duplex type coating apparatus, a left-right pair of dies and are disposed on opposite sides of a carrying path of a web, the dies and are each made up of an upper member and a lower member, a tip part of the lower member projects further toward the carrying path than a tip part of the upper member, and coating liquid discharge passages are inclined in the direction of the carrying path of the web. As a result, because the same amount of coating liquid is discharged from each of the dies and coated onto each side of the web, it is possible to carry out coating at the same coating thickness and in the same position on both sides of the web.

Abstract: A field effect transistor includes a semi-insulating semiconductor substrate; a buffer layer disposed on the substrate and having a high resistance; a first semiconductor layer disposed on the buffer layer and having a relatively high concentration of a dopant impurity; a second semiconductor layer disposed on the first semiconductor layer and having a relatively low concentration of a dopant impurity; a third semiconductor layer disposed on the second semiconductor layer and having a relatively high concentration of a dopant impurity; a fourth semiconductor layer disposed on the third semiconductor layer; and a gate electrode, a source electrode, and a drain electrode disposed on the fourth semiconductor layer wherein the electron affinity of the second semiconductor layer is larger than that of the first and third semiconductor layers, and the difference between the electron affinities of the first and second semiconductor layers proximate their junction is larger than the difference between the electron af

Abstract: A dry barrel finishing machine is disclosed. The machine includes a device to drip or spray water to wet the surface of media. The faucet of the device is located adjacent or in the barrel or barrels of the finishing machine so that it can spray water on media in the barrel or barrels. The media is cooled by the sprayed water. Since the sprayed water wets and softens the surface of the media, attrition dust on the surface of the media is easily removed during attrition. Also, since the wetted surface of the media tends to peel, it is self-sharpened. Thus the media always keeps its abrasive ability.

Abstract: A high resistance compound semiconductor layer included in a semiconductor device including a plurality of compound semiconductor layers having different compositions includes a compound semiconductor that is vapor phase grown employing an organic metal compound including In, an organic metal compound including Al, and a hydrogenated compound or an organic metal compound including As. The high resistance compound semiconductor layer includes p type impurities having a concentration that positions the Fermi level of the compound semiconductor approximately at the center of the band gap of the compound semiconductor. Therefore, it is possible to produce a high resistance AlInAs layer that has less impurities that are diffused into an adjacent compound semiconductor layer.

Abstract: An improved dry barrel finishing machine is described, in which a mass consisting of media and workpieces is flowed in the barrel of the machine for abrasive finishing of the workpieces and in which air suction is used to remove dust resulting from the finishing operation and to cool the barrel and the mass. The mass is flowed by rotation of the barrel by a motor or through the vibration of the barrel by a driving mechanism. Air inlets and outlets are provided in the barrel. An air suction device draws air through the barrel and around the workpieces and media during the finishing operation. The drawn out air picks up dust and media particles resulting from the abrasive finishing operation and cools the media and the barrel.

Abstract: A toner unit includes a toner supply unit for storing the toner to be supplied to a developing device and a toner recovery housing unit integrated with the toner supply unit, for accommodating any recovered toner removed from an image bearing member by a cleaning device. The toner unit is detachably mounted on a processing unit having the developing device and the cleaning device. The toner recovery housing unit has an air flow portion for permitting air to flow inside of the toner recovery housing unit to outside so as to decrease the internal pressure of the toner recovery housing unit when the toner unit is mounted on the processing unit. Also, the toner supply unit has a toner replenishing portion for permitting replenishment of toner therein and the toner recovery housing unit has a recovered toner removing portion for permitting removal of recovered toner accommodated therein. Thereby, the toner unit may be repeatedly reused.

Abstract: An image forming apparatus includes a toner processing unit which is detachably fitted to a cleaning device and a developing unit arranged in the apparatus body. The unit has first and second container integrated with each other. The first container defines a storing portion storing toner which is to be supplied to the developing unit. The second container defines a recovery portion for receiving waste toner removed by the cleaning means. The storing portion and recovery portion are partitioned from each other by a partitioning wall of the unit. The partitioning wall has a through-hole through for introducing, when the amount of the developing agent received into the recovery portion exceeds a capacity of the recovery portion, an excess part of the developing agent into the storing portion.

Abstract: There is provided a kit having integrally a supply toner storage section for supplying a developer to a developing unit, and a waste toner storing section for storing the developer removed from a photosensitive body by a non-transferred toner removing means. The kit is detachable from the developing unit and the non-transferred toner removing means. The condition of (B)>(C)>(B).times.(A) is satisfied, where (A)=the non-transfer rate by a transfer charger, (B)=the developer storage amount of the supply toner storage section, and (C)=the developer storage amount of the waste toner storage section.

Abstract: There is provided a kit comprising integrally a supply toner storage section for supplying a developer to a developing unit, and a waste toner storing section for storing the developer removed from a photosensitive body by non-transferred toner removing means. The kit is detachable from the developing unit and the non-transferred toner removing means.

Abstract: On a frame, a rotary grindstone is rotatably provided in such a manner that the upper surface of the rotary grindstone serves as a grinding side and a workpiece holding device which holds a workpiece and abuts the workpiece against the grinding side of the rotary grindstone is provided. Furthermore, a truing dressing device is provided on the frame, the truing dressing device bringing a rotary grindstone for truing dressing into contact with the grinding side of the rotary grindstone for the purpose of conducting truing dressing the grinding side of the rotary grindstone with retaining grinding conducted by means of the rotary grindstone.

Abstract: The upper portion of a frame of a lapping device is provided with a device for supplying a workpiece, a grindstone, and a delivering device, and a movable arm is horizontally and movably supported by a support column of the frame in such a manner that the arm moves above the supplying device, grindstone, and the delivering device. The movable arm is provided with an device for autorotating the workpiece, the autorotating device being able to move upwardly or downwardly through the pressurizing device, and the movable arm further being provided with a device for holding the workpiece beneath the autorotating device. The workpiece is transported by the holding device to a position above the grindstone, and is brought into abutment with the grindstone by a holding member which is disposed at the lower end of the autorotating device, whereby it is ground with being rotated.

Abstract: In an optical deflector of a polygonal mirror type, a cylinder rotatably overlaps on a fixed shaft with a gap between them. The cylinder rotates the polygonal mirror therewith. The cylinder is radially supported by a journal bearing of dynamic pressure type and axially suspended by a magnetic thrust bearing. The cylinder and the fixed shaft are made of nonmagnetic material, so that the cylinder is prevented from eccentric rotation because of local magnetization of cylinder and the shaft.

Abstract: An apparatus for detecting door movement data in an automatic door system is improved in that an opening-direction sensor and a closing-direction sensor are provided on a horizontal member of a slide door frame, while a slide door is provided with a dog having a plurality of actuating portions adapted to switch ON or OFF the opening-direction sensor and the closing-direction sensor as arrayed at an interval in the direction of sliding, so that the opening direction sensor and the closing direction sensor may be switched ON and OFF repeatedly as the door is moved in the opening or closing direction.

Abstract: A housing apparatus having first and second housings is provided with an arm section extending from the first housing onto the second housing and having a free end portion. The arm section has a coupling portion rockably supported on the second housing portion, and a free end portion extending from the first housing onto the second housing. The free end portion is coupled to an urging device disposed on the second housing portion. The urging device applies a predetermined urging force to the free end portion when the first housing is rotated around the coupling portion by a predetermined angle from the second housing so that the first housing is maintained in a predetermined position in which a space is formed between the first and second housings, when the first housing is swung around the coupling portion by a predetermined angle from the second housing.

Abstract: In an optical deflector of a polygonal mirror type, a rotating shaft is supported by a pair of journal bearings of a herringbone dynamic pressure type and a magnetic thrust bearing. The magnetic thrust bearing comprises first and second annular magnets. The first annular magnet is coaxially fixed to the shaft and has a first magnetic pole arrangement on its outer surface. The second annular magnet is fixed to a housing, and has its inner surface opposed to the outer surface of the first magnet and magnetized with a pole arrangement different from the pole arrangement of the first magnet, so that the first and second magnet attract one another to suspend the shaft. Ferromagnetic plates are fixed on both upper and lower surfaces of the first and second magnets.

Abstract: A continuous padding type dyeing machine particularly suitable for handling elastic fabrics, the machine including a padding bath with at least a pair of main and auxiliary padding rollers and a dryer having a pair of spaced endless conveyors means provided on opposite sides of a path of travel of the fabrics for transferring them through the dryer without causing excessive tensioning thereto. The endless conveyors are movable in and along a number of adjustable guide members and provided with a number of pin members for holding longitudinal side edge portions of the fabrics. A pair of detectors are provided at a lower end of a vertical section of the path of travel of the fabric through the dryer in association with opposite longitudinal side edges of the fabric for adapting the guide members to the particular width of the fabric under treatment.