Abstract: Provided is a module for automatic tool exchange device of novel structure wherein electric signals can be transmitted with high reliability while preventing transmission efficiency from deteriorating between a first coupling member and a second coupling member. An electromagnetic shielding member is arranged on an outer circumference of a core member except for a transmission surface, a gap member having electromagnetic shielding effect lower than that of the electromagnetic shielding member is interposed between the core member and the electromagnetic shielding member, and a first module and a second module are provided, respectively, with coil units equipped with coil heads which are constituted to include a coil member, the core member and the gap member.

Abstract: Provided is a module for automatic tool exchange device of novel structure wherein electric signals can be transmitted with high reliability while preventing transmission efficiency from deteriorating between a first coupling member and a second coupling member. An electromagnetic shielding member is arranged on an outer circumference of a core member except for a transmission surface, a gap member having electromagnetic shielding effect lower than that of the electromagnetic shielding member is interposed between the core member and the electromagnetic shielding member, and a first module and a second module are provided, respectively, with coil units equipped with coil heads which are constituted to include a coil member, the member and the gap member.

Abstract: A scattered-light smoke detector having an improved shield structure. A detector circuit is provided on a printed circuit board which is disposed at an upper portion of a smoke detecting section. The smoke detecting section includes a planar base and a surrounding wall extending downwardly from a lower surface of the base and having an opening or openings which allows or allow smoke to enter therethrough. The surrounding wall defines a smoke detecting space therein. A light emitting element and a photodetector element which are disposed at positions where they are not opposite each other and optical axes thereof intersect each other at a predetermined angle and said photodetector element can receive light from the light emitting element scattered by smoke entering the smoke detecting space. The printed circuit board is attached on an upper surface of the base. A shield layer is interposed between said printed circuit board and said base.

Abstract: A plurality of fire detectors for detecting a physical change caused by fire and a central signal station for receiving a fire signal from the fire detectors to raise an alarm are connected to each other through optical fiber cables. The central signal station transmits power light for supplying power and timing signals which are superposed on the power light for controlling operation timing to the respective detectors through the optical fiber cables, while each of the fire detectors converts the power light into electric power, carries out a fire detecting operation in response to the timing signals and transmits, upon detection of a fire, a fire signal in the form of light to the central signal station through the optical fiber cable.

Abstract: The present invention is a fire detection system. A timer sets an observation time. This may be accomplished by a first counter or shift register receiving a predetermined number of oscillator pulses. A second counter or shift register counts an alarm pulse produced by an AND circuit from the oscillator and the output of a fire detector. If the observation time expires before the second counter or shift register reaches its full count, the second counter or shift register is reset. If the second counter or shift register reaches its full count prior to the expiration of the observation time, the fire alarm is activated. Using this method, the system distinguishes a false alarm from the fire detector from the actual start of a fire.

Abstract: An ionization smoke sensor including a pair of ionization chambers normally biased to maintain an ionic current which varies in response to smoke particles within one of the chambers. A normally non-conductive transistor is biased to conduct when an impedance change of the combination of ionization chambers, caused by the smoke, exceeds a certain amount. The conductive transistor in turn biases a thyristor to conduct to actuate an alarm circuit. A comparator circuit is connected between the transistor and the thyristor for providing a biased signal therebetween. The biased signal is not applied by the comparator until the current through the conductive transistor exceeds a certain threshold value. Consequently, leakage currents of the transistor when it is non-conductive are isolated from the thyristor to prevent erroneous triggering of the same.