Abstract: An optical amplification relay transmission system containing, on a transmission line, an optical repeater for amplifying and relaying an optical signal. The object of the present invention is to perform monitoring of the optical transmission line and optical repeater in a short time and to make the construction of the optical repeater simple. The terminal station contains means for transmitting a burst optical signal on a first optical transmission line, and receiving the burst optical signal transmitted back through a second optical transmission line. Each optical repeater contains a first optical coupler for branching the above burst optical signal transmitted through the first optical transmission line, and a second optical coupler for making the branched burst optical signal, flow through the above second optical transmission line.

Abstract: A car door hinge comprises a rotating member 2 hinged on a fixed member I by means of a hinge pin 3. One end 5 of a wire spring 4 is attached to a point on the rotating member 2 distant from the hinge pin, and the other end 8 of the wire spring 4 is attached to a point on the fixed member 1 inside a sector of a circle defined by the hinge pin 3 and an arc subtended at the hinge pin 3 which is described by the end 5 as the rotating member rotates. A spring restoring force therefore acts during the opening and closing of the door so that the door always opens and closes properly. Moreover, the spring occupies a minimum of space, and the rotation of the door is stopped at a predetermined angle.

Abstract: An optical signal transmission device which includes a number of laser diodes each having a different oscillating wavelength and a number of exclusive external modulators are provided based on the number of laser diodes for receiving corresponding outputs of the respective laser diodes and modulating output lights of the laser diodes by separate electrical signals. Also included is an optical coupler device for coupling the optical signal outputs of the external modulators therebetween and an optical amplifying unit for amplifying the output of optical signals of the optical coupler device. The modulated optical outputs of the external modulators are delivered to an optical fiber transmission line in a time-series-mode.

Abstract: In an optical communication system formed by terminal stations, optical repeaters provided between terminal stations, and optical fiber cables connecting between terminal stations through optical repeaters, the system includes: an optical wavelength multiplexer provided in a terminal station to multiplex a first optical signal having a wavelength .lambda.1 with a second optical signal having a wavelength .lambda.2; an optical wavelength demultiplexer provided in the terminal station to demultiplex the first optical signal from the second optical signal; plural optical repeaters, each having a unit for amplifying the first and second optical signals in accordance with a level of the second optical signal separated from the first optical signal.

Abstract: An attitude control system for an antenna on a mobile body is comprised of a supporting device for supporting the antenna in such a manner that the antenna is rotatable and is movable in the vertical direction, a driving device for driving the antenna, an attitude change detecting device for detecting a speed of the attitude of the antenna relative to to the source of radio wave, a first control device for controlling the driving device in such a manner that the antenna is driven for cancelling the deviation between the resultant of the attitude change detecting device and a correcting value a receiving device for receiving radio wave which is connected to the antenna, a second control device for changing the attitude of the antenna toward higher receiving level derived from the receiving device and a drift correcting device for renewing the correcting value in such a manner that accumulated vector becomes zero which is the accumulation of a vector upon the changing of the attitude of the antenna.

Abstract: A biaxial rotary drive unit drives an antenna Ant on a vehicle for rotation in both azimuthal and elevational directions. A first axis Y represents a vertical axis, and an azimuth turntable 120 is rotatable about the first axis. The second axis X represents a horizontal axis, and the antenna Ant is mounted on the turntable so as to be rotatable about the second axis in the elevational direction. The turntable 120 represents a gear of an increased diameter, which is meshed by a gear 144 of a reduced diameter to be driven thereby for rotation. A cylindrical shaft 116 extends through the center of the larger diameter gear 120. The cylindrical shaft 116 carries a ring gear meshing with a pinion gear 154, which serves driving the cylindrical shaft 116 up and down. The vertical movement of the cylindrical shaft 116 is transmitted through a link 115 to drive the antenna Ant for rotation in the elevational direction.

Abstract: A mobile telephone apparatus having a conventional key pad, memory for storing telephone numbers at locations identifiable by certain digits and a processor for controlling the auto dialing of telephone numbers in response to a key pad input of the respective digits. The apparatus further includes a capability of receiving telephone numbers transmitted from a remote operator and storing the numbers at memory location that may be auto dialed.

Abstract: A method of, and apparatus for, controlling the directional aiming of an antenna device including: scanning the antenna along with a conical path and detecting a directional point at which a detected level of reception along the conical path is turned from increasing to decreasing; scanning the antenna along a directional path defined by a center point of the conical path and the directional point, and detecting a signal source point at which a detected level of reception along the directional path is turned from increasing to decreasing; and setting a directional aiming of the antenna at the detected signal source point.

Abstract: The attitude of an antenna which is used with an artificial satellite emitting a radio wave is controlled by a combination of the establishment of an antenna attitude in accordance with gyro data, a small range conical scan which is conducted when a reception level is less than a first reference and at or above a second reference and is relatively high for altering the antenna attitude to a direction which provides a higher reception level, and a broader range search scan which is conducted when the reception level is less than the second reference and is relatively low for altering the antenna attitude to a direction which provides a higher reception level.

Abstract: A telephone apparatus has abbreviated number input means for inputting an abbreviated number in a predetermined form, password input means for inputting a password in a predetermined form, a telephone number memory section for storing terminating subscribers' telephone numbers in correspondence with combinations of abbreviated numbers and passwords, and a control section for selecting and outputting a terminating subscriber's telephone number from the telephone number memory section in response to a dialing start signal and on the basis of a combination of an abbreviated number and a password included in the dialing start signal. Thus, since the telephone number memory section is accessed on the basis of a combination of an abbreviated number and a password, even if an abbreviated number is known, the corresponding terminating subscriber's telephone number is not read out unless an appropriate password is input.

Abstract: A telephone apparatus has a telephone set including a wireless handset, a wireless transmitter, a wireless receiver, a signal identifying circuit for discriminating received signals to generate or erase power-on signals, a telephone set power supply circuit having a secondary battery cluster and switch circuits for applying the voltage of the secondary battery cluster to the above-described elements during a predetermined period, a power supply terminal connected to the secondary battery cluster, and a telephone set power supply controlling circuit; a main power supply; a power supply switch; a connection switching circuit for selectively connecting the power supply terminal to the power supply switch or a predetermined load; and a telephone power supply control instructing circuit responsive to the closing of the power supply switch for operating the connection switching circuit to form a connection between the power supply terminal and the predetermined load to transmit a first signal, subsequently operatin

Abstract: A telephone system in the vehicle comprises a detectable handset including a microphone and speakers, a pad positioned near a vehicle driver for holding the detachable handset, amplifiers for amplifying a voice signal from the microphone, a position detector for detecting a distance between the handset and the pad, and a gain controller for controlling the gain of the amplifiers in response to the distance detected by the position detector. When the handset is held on the pad, the position detector detects that the handset is positioned adjacent the pad. At this time, the gain controller increases the gain of the amplifiers, and consequently, the voice from the vehicle driver is clearly received. Therefore, a vehicle passenger especially the driver, can use the telephone system while grasping a steering wheel with both hands. When the handset is removed from the pad, the position detector detects that the hand set is positioned remote from the pad.

Abstract: Method and apparatus are provided for minimizing delay in the operation of a safety device in a device for thermally fixing an image to a paper medium. A safety device, such as a thermostat, is set to deactivate a heater unit if the temperature of the heater unit exceeds a first temperature value. If the temperature of the thermal unit exceeds a second temperature value lower than the first temperature value, a heat exhausting device, such as a fan, is turned off. Shutting off the heat exhausting device stops cooling of the heater, thus decreasing the time elapsed before the safety device can detect the first temperature value.

Abstract: The location of a vehicle itself is detected on the vehicle in combination with an attitude control of an antenna mounted on the vehicle so that the antenna is directed toward a geostationary satellite. The antenna is driven for rotation about both a horizontal and a vertical shaft. A mean running speed MVb and a mean azimuth MQd of the vehicle over a time interval t.sub.2 are used to calculate corrections .DELTA.Px and .DELTA.Py to the vehicle location, which corrections are added to vehicle location data corresponding to the starting point of the interval t.sub.2. A mean azimuth MQd, a mean speed MVb, a mean roll angle MQr and a mean pitch angle MQp are used to control shifts .DELTA.Qdpo and .DELTA.Qppo which occur in the antenna attitude relative to the geostationary satellite as a result of the running of the vehicle over the time interval t.sub.2, and these shifts are used to correct the antenna attitude.

Abstract: A cassette tape recorder includes operating buttons for controlling the functions of the tape recorder, a cassette ejection button for exposing a cassette accommodating section having a cover, and an arresting member interlocked with the operating buttons and ejection buttons. The arresting member selectively hinders the operation of the ejection button when any of the operating buttons is pushed to put the tape recorder in a tape running mode and the operation of the operating buttons when the cassette accommodating section is exposed, thereby providing a foolproof mechanism for the cassette tape recorder.

Abstract: A roller unit for removing copy paper from an electrophotographic copying machine, the unit comprising a drive roller and an idler roller, each having a plurality of longitudinally extending portions where the diameter of every other portion is larger than its adjacent portions, the rollers being disposed adjacent one another so that the larger portions of the drive roller are adjacent the smaller portions of the idler roller, and a plurality of rings disposed about the rollers to establish a substantially uniform clearance not greater than 1.5 mm. therebetween so that if any of the copy paper is ignited within the copying machine, the fire will be extinguished because of the clearance between the rollers, the copy paper being delivered from the copying machine with a predetermined rigidity along its direction of movement because of the disposition of the rollers with respect to one another to thereby lessen the tendency for the copy paper to turn over as it is delivered from the copying machine.