Abstract: A photoelectric switch is adapted for us as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self-diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes.

Abstract: A photoelectric switch is adapted for use as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self-diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes.

Abstract: A photoelectric switch is adapted for use as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes.

Abstract: An error preventive circuit for a photoelectric switch is formed of a logic circuit, and it is highly responsive, while preventing erroneous operations caused by noises, eliminates the need of capacitors, and is suitable for circuit integration. The circuit validates the incoming light reception pulse only when its base-of-N counter has advanced to N counts, and, if the light reception pulse deviates in time by a certain value in the range of synchronism, a base-of-M counter is preset so that the timing of light reception is re-established at the center of the allowable range of synchronism.

Abstract: A photoelectric switch is adapted for use as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self-diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes.

Abstract: A photoelectric switch is adapted for use as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self-diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes.

Abstract: A photoelectric switch is adapted for use as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self-diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes.

Abstract: A photoelectric switch is adapted for use as either a transmission type or a reflection type switch. To provide an integrated circuit for the photoelectric switch and to minimize input/output pins, multiple functions are assigned to each input/output pin. Such functions are provided via first to fourth integrated circuit input/output pins, i.e., the first pin serves functions in the supply of a detection output and a self-diagnosing output; the second pin supports a circuit for driving a projection type LED and a circuit for turning the LED off; the third pin supports a circuit for reversing a stable indication output and an operation indicating output; and the fourth pin supports a circuit for amplifying a received photo-signal and for controlling the mode of combination of photoelectric signals from a pair of photo-diodes.

Abstract: Electronic switching device comprising external terminal means for connecting the switching device with an external power source and with a load, detection circuit means for developing a detection signal, exclusive-or circuit means including a first input terminal connected to the detection circuit means for receiving the developed detection signal and a second input terminal connected to the external terminal means for receiving a low or high input signal therefrom, and output circuit means connected to the exclusive-or circuit means for receiving an output signal generated from the same and for switching the load which is connected to the external terminal means.

Abstract: There is provided a photoelectric switch comprising a photoelectric detection means, a circuit means disposed independently of the detection means, and cable means interconnecting the detection and circuit means, there being formed in the photoelectric detection means a parallel circuit comprised of a light emission photodiode and a display photodiode of opposite polarity thereto as connected in parallel-circuit relation, which parallel circuit is connected to a pulse oscillation circuit included in the circuit means with a couple of lines, whereby a pulse current of single polarity is applied from the pulse oscillation circuit to the parallel circuit to thereby actuate only the light emission photodiode, and there being disposed in the circuit means a display circuit which functions in response to a detection output obtained in the circuit means so that through the tow lines a pulse current of opposite polarity to the first-mentioned pulse current flows to the parallel circuit in a phase where the first-ment

Abstract: There is provided a photoelectric switch comprising a light projecting segment including a pulse oscillator and a light-emitting element adapted to give a pulse light emission in response to an output pulse of the pulse oscillator, a light reception segment including a light reception element adapted to yield a light reception signal on incidence of light, a gate circuit adapted to gate the light reception signal according to the output pulse of the pulse oscillator and an integration circuit for integrating outputs of the gate circuit, and a control circuit for varying the pulse frequency by controlling the pulse oscillator on generation of a light reception signal from the light reception element.

Abstract: Reflection-type photoelectric switching apparatus comprising a housing having a transparent front window, a light projecting device, a light receiving device arranged in side-by-side relation with the light projecting device, the light projecting and receiving devices enclosed in the housing and in a predetermined space between the devices and the front window, an optically opaque screen having a pair of transparent portions corresponding to said light projecting and receiving devices, said screen being slidably disposed in said predetermined space, an adjusting mechanism controllable from outside of the housing for driving said screen to continuously adjust an effective area of said pair of transparent portions thereof, so that a detection field defined by a common zone, in which the projected and reflected light ray bundles are crossed, is continuously variable with said adjusting mechanism.

Abstract: A reflection-type photoelectric switching apparatus for providing an electric switching signal indicating existance information of an object to be detected thereby comprising a light projecting device for projecting a beam of light to the object, a light receiving photoelectric device arranged in side-by-side relation with the light projecting device for receiving a reflected light from the object, an optical axis adjusting means which is controllable from outside of housing of the apparatus for adjusting the optical axes of the light projecting and receiving devices, and optical members which allow both the light beam from the projecting device and the light beam to be incident on the receiving device to pass within a predetermined light path so that the two light beams will be crossed in a desired detection field, the distance from the apparatus to the desired detection field being continuously variable by the optical axis adjusting means.

Abstract: A photoelectric switch comprising a housing which encloses at least a light emitting element or a light responsive element. The housing consists of two opaque plastic shells welded to each other by ultrasonic welding and a window means of transparent plastic simultaneously welded to the shells by said ultrasonic welding. The window means is formed and attached to the shells in such a manner that it includes no peripheral portion which is in parallel with the direction of ultrasonic welding pressure.

Abstract: A photoelectric switch comprising a circuit block which is housed within a fluid-tight enclosure.The enclosure comprises a box-like housing having a first opening at one end, a second opening at another end and a cap means closing the first opening and fixed to the housing. The circuit block comprising a circuit board and a plurality of circuit elements, is placed in the enclosure through the first opening. A light-source element and a light-responsive element are positioned in the cap means and electrically connected to the circuit board.A conductor is electrically connected to the circuit board and extends out of the enclosure through the second opening.

Abstract: A photoelectric detector for detecting the presence of an object which comprises at least a light ray projecting element, for example, of a luminescent diode and a light ray receiving photoelectric element, for example, of a photo transistor. The two elements are respectively received in bores formed in a housing in such a manner that only the light rays emitted by the projecting elements is received by the receiving element with any lights due to irregular reflection prevented from reaching the receiving element so as to avoid erroneous functioning of the detector.