Abstract: An electromagnetic actuator according to the present invention has a rotor magnetized to have a plurality of poles; a base rotatably supporting the rotor; a yoke having a plurality of magnetic pole portions that are formed so as to face an outer peripheral surface of the rotor and that generate different magnetic poles; a magnetizing coil; and a bobbin/presser member which is disposed on an outer periphery of the yoke, around which the coil is wound, and with which a pressing portion for pressing the yoke against the base and for supporting the rotor is formed integrally.

Abstract: An electromagnetic actuator for driving the shutter of a camera includes a rotor (10) magnetized with the N and S poles, and first magnetic pole parts (21, 31) and second magnetic pole parts (22, 32) that are disposed to face the outer circumferential surface of the rotor (10) and generate mutually different magnetic poles when an electric current is applied to the coil (40), in which an output pin (11) of the rotor (10) is magnetized with one of the N and the S poles and forms a projection that projects outward in the radial direction, and, in the vicinity of the first magnetic pole part (31), an auxiliary magnetic pole piece (33) is provided that is disposed near the output pin (11) serving as a projection when the rotor (10) is located at an initial position and that generates the same magnetic pole as the first magnetic pole part (31) in a current-running state. Therefore, a maintaining force can be raised especially in a current-stopped state, and a driving force can be raised.

Abstract: A camera blade driving device for use in a camera has a base plate having an exposure aperture; a blade supported pivotably on a supporting shaft on the base plate and capable of blocking part or all of light passing through the aperture while facing the aperture; and an electromagnetic actuator for driving the blade. The electromagnetic actuator has a frame member joined to the base plate; a rotor one end of which is supported by the frame member and an opposite end of which is supported by the base plate, the rotor having a driving pin by which a driving force is exerted onto the blade and rotating within a predetermined angular range; a magnetizing coil wound onto the frame member and the base plate; and a yoke provided outside the coil substantially coaxially with the rotor.

Abstract: A lubricating oil composition for automatic transmission comprises a base oil having a pour point of −25° C. or lower and a kinematic viscosity of 2 to 7 mm2/s at 100° C., (A) a over-based calcium sulfonate having a total base number of 300 to 500 mg KOH/g, (B) a succinimide having boron atom and/or a succinimide having no boron atom, which are substituted with a hydrocarbon group (an alkyl groups or alkenyl groups having an average molecular weight of 1,000 to 3,500), and, and (C) a phosphorous acid ester-based compound, each in a specific amount. The composition has a great statical friction coefficient (&mgr;s), an excellent transmission torque capacity and a friction characteristic having a &mgr; ratio of 1 or smaller, exhibiting excellent resistance to transmission shock on clutching.

Abstract: Provided is a lubricant composition prepared by adding, to a base oil, (a) from 0.01 to 5% by mass, based on the composition, of a phosphate, (b) from 0.005 to 1% by mass of an amine salt of an acid phosphate and (c) from 0.01 to 1% by mass of a sulfur-containing extreme-pressure agent. The composition is favorable for non-zinc hydraulic oil, which has good oxidation resistance, sludge resistance and wear resistance and further has improved extreme pressure resistance and prolonged fatigue life.

Abstract: The camera shutter unit of the present invention comprises a diaphragm blade arranged to be capable of moving between a stopping-down position wherein an aperture is stopped down, and an evacuating position wherein the aperture is opened. A shutter blade is arranged to be capable of moving between an opening position, wherein the aperture is opened, and a closing position, wherein the aperture is closed. A dive-control mechanism is provided for drive-controlling the shutter blade and the diaphragm blade. The drive-control mechanism has a single electromagnetic drive source, a spring for restricting movement of the shutter blade toward the closing position when the diaphragm blade is positioned in the stopping-down position, and for releasing its restriction by a predetermined or more drive force generated by the electromagnetic drive source, and a control means for controlling the electromagnetic drive source.

Abstract: The camera shutter unit of the present invention comprises a diaphragm blade arranged to be capable of moving between a stopping-down position wherein an aperture is stopped down, and an evacuating position wherein the aperture is opened. A shutter blade is arranged to be capable of moving between an opening position, wherein the aperture is opened, and a closing position, wherein the aperture is closed. A drive-control mechanism is provided for drive-controlling the shutter blade and the diaphragm blade. The drive-control mechanism has a single electromagnetic (drive source, a spring for restricting movement of the shutter blade toward the closing position when the diaphragm blade is positioned in the stopping-down position, and for releasing its restriction by a predetermined or more drive force generated by the electromagnetic drive source, and a control means for controlling the electromagnetic drive source.

Abstract: In the pointing device of the present invention, a sensor is connected via an amplifier section to a microcomputer. Further, a reference voltage generator is connected to the microcomputer and the amplifier section. With this construction, the microcomputer modifies a coefficient, used when calculating a reference voltage for determining a cursor speed, in response to the size of a force applied to the sensor by an operator.

Abstract: Disclosed herein are a color filter wherein an organic pigment is comprised of primary particles having an average particle size of 20 to 200 nm and a particle size distribution within .+-.35 nm and said organic pigment has a color difference of 5 or less when it is subjected to exposure at an illuminance of 100,000 lux or more for 100 hours or more under the condition of a surface temperature at 50.degree. C.; a color filter wherein the film of coloring matter in green has a ratio (T.sub.485 /T.sub.610) of the transmittance of 485 nm (T.sub.485) to that of 610 nm (T.sub.610 ) of 3.5 or less, the maximum transmittance of the film of coloring matter in green is 60% or more and said maximum transmittance is assigned a wavelength of 540 to 550 nm; and a color filter using a specific organic pigment as each of red, green and blue pigments.

Abstract: A pushbutton-operated waveband or station selector or tuner, comprising a front panel to which a bracket for each pushbutton is supported perpendicular thereto so as to be movable to-and-fro, said pushbutton being provided with a push piece for kick arm and a setting plate which can engage a pivoting crank, the kick arm being disposed on the rear side of said front panel parallelly thereto, so that it is pivotable with respect to right and left side plates of the apparatus. At the rear of said kick arm, there is disposed the pivoting crank (31) which is mounted at the opposite ends thereof so as to be pivotable with respect to the frame side plate, and above said pivoting crank there is movably supported a core slide which is coupled with said pivoting crank, said core slide having mounted on the rear portion thereof a plurality of cores directed toward the rear side of the apparatus, these cores each being inserted into a movable to-and-fro in a respective tuning coil disposed at the rear of the apparatus.

Abstract: An indicator mechanism in a pushbutton tuner characterized in that there is provided a front plate horizontally extending from the top end of the tuner casing. The front plate is integrally formed with two-stepped protrusions, the lower one of which is inserted in a central bore of a slidable plate mounted on the front plate so that the slidable plate can pivot about the lower protrusion as an axis. The indicator mechanism further comprising a plate spring having an open rectangular configuration for seizing the front plate between its upper and lower plates. The plate spring is also formed with a through bore in its upper plate for receiving the upper protrusion of the front plate. The front plate is further formed with projections as high as the lower protrusion by which the upper plate of the plate spring is supported.