Abstract: A resin composition includes a thermosetting resin and a filler dispersed in the thermosetting resin. A filler particle size curve represents a small-diameter peak, a large-diameter peak having a higher frequency than that of the small-diameter peak, and a valley which is positioned between the small-diameter peak and the large-diameter peak and has a lower frequency than that of the small-diameter peak. An ignition coil device allows the resin composition to penetrate into gaps between turns of a coil wire.

Abstract: Binocular luminous fluxes are formed by an objective lens and a pair of relay lenses and go through a splitting optical system, which allows an assistant to observe the same stereoscopic view as the surgeon by using an assistant's binocular eyepiece optical system at a location across from the surgeon via a splitting optical system. Part of at least one of the binocular luminous fluxes is incident on a pupil splitting optical system, forming a binocular luminous flux that has undergone pupil splitting, which allows stereoscopic observation by pupil splitting even when the assistant's binocular eyepiece optical system is rotated to the surgeon's side.

Abstract: An operating microscope is disclosed which has a variable magnification observing optical system capable of varying according to an observing magnification the exit position of illuminating light to be irradiated onto an observation target. For example, during low-magnification observation using a wide observing light flux, illuminating light is made to exit toward the observation target from a position distant from an observing optical axis, whereas during high-magnification observation using a narrow observing light flux, illuminating light is made to exit toward the observation target from a position close to the observing optical axis. Accordingly, the observation target can be illuminated from a direction as close as possible to the observing optical axis without allowing a member for illumination to interfere with an observing light flux.

Abstract: A stick-type ignition coil have a central core, a cylindrical member, primary spool, primary coil, secondary spool, secondary coil, outer core and a resin insulator. The two longitudinal end corners and faces of the core are covered by respective buffer members. The inner circumferential corners of the outer core is supported by ring members. Some of the members disposed radially inside and other members disposed radially outside of the inside members are held slidably to each other in the ignition coil. The spools are made of resin containing a rubber in excess of 5 weight percent and reinforcing materials. The resin insulator contains a flexible material.

Abstract: A microscope for operation body 1 having an objective lens 4 and eyepieces 5 is combined with a cap that is capable of covering the entire part of the microscope body 1 and which is made of a sterilizable elastic material such as rubber. A retaining portion 7 projecting to retain the cap is provided on the microscope body 1 and a mounting portion engageable with the retaining portion 7 is provided on the cap.

Abstract: It is a purpose of the invention to provide a dust protector for an image exposure device capable of preventing particles from sticking to windows or the like of the image exposure device and free from moisture condensation on the windows or the like of the image exposure device as a result of direct exposure of the same to the atmosphere and an image forming apparatus utilizing the same. The purpose is achieved by providing a dust protector for an image exposure device for performing image exposure on a member to be exposed from below with a dust protective member for preventing particles from sticking to at least a member located above an optical path of the image exposure device by covering the image exposure device from above without blocking the optical path of the image exposure device and an air flow generating unit for generating an air flow that prevents particles from entering the region covered by the dust protective member.

Abstract: A stick-type ignition coil have a central core, a cylindrical member, primary spool, primary coil, secondary spool, secondary coil, outer core and a resin insulator. The two longitudinal end corners and faces of the core are covered by respective buffer members. The inner circumferential corners of the outer core is supported by ring members. Some of the members disposed radially inside and other members disposed radially outside of the inside members are held slidably to each other in the ignition coil. The spools are made of resin containing a rubber in excess of 5 weight percent and reinforcing materials. The resin insulator contains a flexible material.

Abstract: The present invention provides a molded article obtained by insert molding an electrical connection 1 having a plurality of metal terminals 4 from a synthetic resin while the metal terminals 4 are being used as inserts. A primary molded article 7 having a plurality of metal terminals 4 as inserts is obtained by conducting insert molding in such a manner that a connecting portion connects the metal terminals 4, and a molded article is obtained by conducting insert molding while the primary molded article 7 is being used as an insert. Recesses 6a are formed in the mid positions of the connecting portion 6 which connects the metal terminals 4, and as a result edges 6b are formed.

Abstract: To provide a surgical microscope comprising a microscope collimator for enabling the operator to easily recognize the swivel center of the microscope body regardless of what position the microscope body moves for easy setting of the swivel center point of the microscope body, a surgical microscope pivotally supporting a microscope body having, an observation optical system with one point on an observation optical axis of the microscope body as the swivel center. The surgical microscope comprises index projectors as swivel center visible indicators being capable of recognizing the swivel center. This configuration enables the operator to easily recognize the swivel center of the microscope body for easy setting of the swivel center point of the microscope body.

Abstract: A hologram comprising a diffraction grating film with an interference fringe recorded thereon, a substrate provided on one side of said diffraction grating film, and cover plates provided on the surfaces of the aforesaid diffraction grating film by use of an adhesive, wherein the lateral face portion of the aforesaid hologram is covered with a water repellent layer, or a hologram comprising a diffraction grating film with an interference fringe recorded thereon and a substrate provided on one side of said diffraction grating film, the surface of the aforesaid diffraction grating film being covered with an adhesive, wherein the aforesaid adhesive contains an epoxy resin mixture consisting of an alicyclic epoxy and novolak type epoxy and an alicyclic acid anhydride type curing agent, a chief ingredient composed of an aromatic epoxy resin(s) and a curing agent comprising a mixture of an alicyclic amine and an aliphatic amine, or a chief ingredient composed of an aromatic epoxy resin(s) and a curing agent compris

Abstract: A stereomicroscope includes an objective optical system, a variable magnification optical system, and a plurality of imaging optical systems, in which the plurality of imaging optical systems can be moved in a plane perpendicular to the optical axis of the variable magnification optical system. Thus, the stereomicroscope has the advantage that where one of two observers wishes to observe a brighter image, the amount of light can be adjusted, without replacement of a light source, by moving the imaging optical systems.

Abstract: A semiconductor integrated circuit including therein a plurality of active devices comprises a semiconductor substrate, a first buffer layer on the substrate, a second buffer layer provided on the substrate and incorporating therein defects with a concentration level substantially larger than the concentration level of the defects in the first buffer layer; a device layer provided on the second buffer layer and being provided with the active devices, and a plurality of unconductive, device isolation regions formed between the active devices such that the device isolation region extends from an upper surface of the device layer toward the substrate at least beyond a lower surface of the device layer.

Abstract: A stereomicroscope is equipped with an objective lens, a variable magnification optical system having an optical axis common with that of the objective lens, a splitting optical system splitting emergent light from the variable magnification optical system into a plurality of optical paths, and an eyepiece disposed in at least one of the optical paths, having a diameter larger than the interpupil distance of an observer. Thus, the stereomicroscope has advantages that, with a simple structure and easy adjustment, many people can make observations, the mountings of photographic and TV devices are possible, the directions in which plural observers see through the microscope can be changed, and eyestrain is difficult to occur which may be caused by the difference in magnification between the images of a bilateral observation optical system.

Abstract: The operating microscope comprises at least one suction port formed in a microscope body or an arm for supporting the microscope body which is to be enveloped in a drape, and an exhaust fan or exhaust pump connected to the suction port. An exhaust port to be connected to an exhaust pump may be formed in the drape. Since air is exhausted out of the drape, and the drape is brought into close contact with the microscope body and the arm by operating the exhaust fan or the exhaust pump, the drape does not constitute a hindrance in the visual field of a surgeon or dgrade operability of the microscope.

Abstract: A semiconductor device having a heterojunction and utilizing a two-dimensional electron gas formed at said the heterojunction comprises a substrate of a semi-insulating material, a first semiconductor layer of undoped indium gallium arsenide formed on the substrate, a second semiconductor layer of n-type indium aluminium arsenide formed on the first semiconductor layer and defining the heterojunction between the first semiconductor layer and the second semiconductor layer, the second semiconductor layer including an exposed region defining an exposed top surface, a third semiconductor layer of n-type gallium arsenide antimonide formed on the second semiconductor layer and having a window defined therein so as to expose the top surface of the exposed top surface region, a gate electrode formed in self-alignment with the window and in contact with the exposed top surface region of the second semiconductor layer, and ohmic electrodes formed on the cap layer in ohmic contact therewith.

Abstract: The surgical microscope comprises a stand, an arm movably attached to said stand for sustaining a microscope body, an electric control equipment divided into a plural number of units removably piled up on said stand and a foot switch unit to be used for executing various types of functions. Accommodated in each unit are a function control means having a single specific function or plural specific functions different from those of the other units and an independent power source means connected to said function control means in a relation of 1:1 or in a different combination. The surgical microscope can be designed compact as a whole, has high operability and assures high security during operation. Should a function be lost due to troubles during operation, the surgical microscope prevents the other functions from being influenced by the troubles and allows to speedily restore the lost function.

Abstract: A semiconductor device having a heterojunction and utilizing a two-dimensional electron gas formed at said the heterojunction comprises a substrate of a semi-insulating material, a first semiconductor layer of undoped indium gallium arsenide formed on the substrate, a second semiconductor layer of n-type indium aluminium arsenide formed on the first semiconductor layer and defining the heterojunction between the first semiconductor layer and the second semiconductor layer, the second semiconductor layer including an exposed region defining an exposed top surface, a third semiconductor layer of n-type gallium arsenide antimonide formed on the second semiconductor layer and having a window defined therein so as to expose the top surface of the exposed top surface region, a gate electrode formed in self-alignment with the window and in contact with the exposed top surface region of the second semiconductor layer, and ohmic electrodes formed on the cap layer in ohmic contact therewith.

Abstract: A surgical microscope arranging, so as to be insertable into and removable from an illuminating optical path for observation, a semi-transparent mirror capable of introducing illuminating light for photographing in a coaxial relation into illuminating light for observation or a totally reflecting mirror having such size as not to entirely interrupt the illuminating light for observation, in order to make it possible that compact size and low cost are attained, the amounts of illuminating light for observation and photographing are sufficiently secured, both the illuminating light are conducted along a common optical axis, and the illuminating light for observation is not interrupted even for a moment in photographing.

Abstract: A field effect semiconductor device which utilizes a 2DEG and is composed of a semi-insulating GaAs substrate; an i-type GaAs active layer; a superlattice structure layer which comprises a first i-type AlAs thin layer, a GaAs thin layer doped with an Si atomic plane, and a second i-type AlAs thin layer, these thin layers forming a GaAs quantum well; and n-type AlGaAs layer; and electrodes for source, drain, and gate.