Copal Company Limited

Kenji Wakazono

Yasuo Ishiguro

Toshihisa Saito

Jun Matsushima

Shigekazu Nakamura

Tetsuto Kageyama

A torque sensor for use in detecting torsion of a power steering device or the like of a vehicle. The torque sensor is provided with a first shaft supported for rotation about its axis in a casing, a permanent magnet secured to the first shaft, a second shaft supported for rotation about its axis in the casing and disposed in end-to-end relationship to the first shaft, a connecting shaft for connecting the first shaft and the second shaft, a magnetic core secured to the second shaft and a magnetism sensor secured to the casing and sandwiched between ring-shaped magnetic members disposed in the vicinity of the outer peripheral face of the magnetic core so that a change in magnetic flux which is caused by the relative displacement of the permanent magnet and the magnetic core is detected by the magnetism sensor as the direction of a variation in the relative position of and the amount of variation in a displacement of the first shaft and the second shaft about the axis of rotation of the first and second shafts.

Torque sensor

An automatic diaphragm aperture controlling device which includes an exposure information pulse generation circuit to generate a pulse in a number corresponding to an aperture value to be controlled, the obtained pulses being based on exposure informations such as a scene brightness or the like. A counter circuit is provided for counting the output of the exposure information pulse generation circuit, together with an aperture value pulse generation circuit for generating pulses in a number corresponding to an aperture value of a diaphragm stopped down in association with a diaphragm drive, and diaphragm fixing means for fixing the diaphragm aperture which fixing means is actuated when an aperture value pulse number is coincident with an exposure information pulse number. The aperture value pulse generating circuit includes a light source, a photo-responsive element, and an intermittent light transmitter adapted for movement between the light source and the photoresponsive element in coupled relationship to the activation of the diaphragm.

Device for automatically controlling diaphragm aperture

An exposure controlling circuit for electric shutters comprising a timer circuit which can determine a proper exposure time in response to the brightness of an object to be photographed and another time circuit which can determine the specific shortest exposure time in order to regulate the exposure time to be determined by the brightness of the object to be photographed to be less than the shortest exposure time obtainable by the inherent performance of the shutter mechanism to be used, whereby when the states of the above mentioned two time circuit started to act simultaneously in relation to the shutter release operation are reversed to each other, the shutter is closed. The above mentioned specific shortest exposure time can be selected.

Exposure controlling circuit for electric shutter

The digital shutter control circuit comprises a reference clock pulse generating circuit, a binary counter circuit having a plurality of output stages each issuing, upon counting the pulses from the reference pulse generating circuit, output signals corresponding to the exposure time to be set in the shutter in terms of 2.sup.n where n is an integer and a selector circuit connected to the shutter closing means and selectively connectable to any of the output stages. The binary counter circuit is actuated simultaneously with the actuation of the shutter opening means for opening the shutter so that the shutter closing means is actuated when the output signal is issued from the output stage to which the selector circuit is connected thereby closing the shutter to provide the selected shutter speed. The shutter control circuit incorporates an AND circuit the inputs of which are connected to at least two output stages selected from the plurality of output stages and the output is selectively connectable to the selector circuit so that, when connected, an exposure time is obtained which is intermediate the values obtained from the above selected two output stages. The exposure times may comprise the series of 1/1000 sec., 1/500 sec.-1/2 sec. and 1 sec. and the selected two output stages may be made 1/1000 sec. and 1/125 sec. so that substantially 1/114 sec. of the exposure time is obtained which exposure time is effective to insure the synchronization of an electric flash device with the shutter in which shutter opening and closing blades are actuated in parallel to the minor sides of the frames of 35 mm film.

Digital shutter control circuit

An electroflash controlling circuit wherein, in order to make the fully open time of a shutter and the flashing time of a flash accurately coincide with each other, a delaying circuit operated by an electric signal for starting a shutter blade opening motion or an electric signal for starting a shutter blade closing motion is provided so that a flashing circuit may be triggered after the lapse of a delay time made by the delaying circuit.

Electroflash controlling circuit including a delay circuit for

A shutter driving circuit including a voltage judging circuit and indicating circuit in order to always properly make shutter opening and closing operations, whereby an electric current is prevented from flowing to driving coils and such state can be indicated by the indicating circuit when the voltage of a current source for feeding a current to a pair of driving coils to be made to make opening and closing motions of the shutter by the voltage judging circuit is below a predetermined value.

Driving circuit for camera shutters

An exposure controlling circuit for electric shutters incorporating therein a voltage drop detecting circuit which will issue a signal for passing a current to a coil for closing a shutter when a current source voltage becomes lower than a predetermined voltage in order to prevent the shutter closing motion from being made unable to be made by the drop of the current source voltage after the shutter is opened. This controlling circuit further includes a driving circuit for making an indication within the field of vision of the view finder of a photographic camera when a signal is issued from the voltage drop detecting circuit.

Exposure controlling circuit for electric shutters

A controlling circuit for electric shutters wherein, in an electric shutter adapted to start a shutter closing moton by energizing a driving coil with a discharge current from a capacitor, the capacitor is made to be discharged by a voltage drop detecting circuit provided so that the shutter may be positively closed even in case a current source switch is opened by an unexpected accident in the course of an exposure controlling operation.

Controlling circuit for electric shutters

A controlling circuit for electric shutters comprising at least one constant current circuit, a pair of capacitors to be charged in advance by a current source battery through the constant current circuit and a pair of driving coils to be energized in turn by discharge currents of the pair of capacitors to start a shutter blade opening motion and closing motion so that the current source battery of a comparatively small capacity may be effectively used.

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Tokyo, Japan

Kenji Wakazono