Horizons Incorporated, a Division of Horizons Research Incorporated

Namco Controls Corporation

General Electric Company

Acme-cleveland Corporation

Robert J Crosby

John M Davenport

William Peil

Robert J McFadyen

Harold W Everson, Jr

Kenneth F Karpinski

David R Schaller

A proximity sensor includes a transducer and a circuit having a switch that changes state in response to a presence of an object in spaced relation to the transducer. The transducer includes a magnetic form defining a generally planar surface facing a sensing zone of the sensor. The magnetic form includes a side surface that extends away from the sensing zone and an internal cavity that opens outwardly toward the sensing zone. A sensing coil is positioned within the magnetic form cavity. The transducer additionally includes a sensor housing supporting the sensing coil and the magnetic form in relation to the sensing zone. A non-ferrous metal shield is positioned inside the sensor housing to surround at least a portion of the magnetic form and enhance a sensing range of the proximity sensor. The shield has an edge that faces the sensing zone located substantially co-incident with the generally planar surface of the magnetic form.

Proximity sensor having a non-ferrous metal shield for enhanced sensing

A power supply wherein the rectified output of two or more transformer secondaries are connected in series and then parallel each half cycle of an alternating current energization signal. Logic circuitry monitors the rectified output and automatically switches from a series to a parallel connection to provide a regulated power supply output.

Power supply

A three or four-terminal electronic control circuit utilizes a thyristor and a transistor connected in their regenerative circuit or, alternatively, three transistors interconnected in a regenerative circuit. The thyristor is connected to operate in a remote base mode as a low gain PNP transistor, together with a bipolar NPN transistor. The thyristor and transistor are connected in a regenerative circuit which results in very high gain, low input current, with low cost and complete control for ON and OFF, and even intermediate range conditions due to direct access to the base of the NPN transistor. A switch may be connected to the base of the NPN transistor to control the current thereinto, and when current flows into this base, then the transistor and thyristor are connected toward regenerative conduction. When the base current is terminated by the switch, then the circuit degenerates toward non-conduction. By maintaining the potential of the control terminal at a constant voltage, then the regenerative and degenerative modes may be held in balance and a linear mode of operation may be obtained, e.g., in a voltage regulator circuit. The foregoing abstract is merely a resume of one general application, is not a complete discussion of all principles of operation or applications, and is not to be construed as a limitation on the scope of the claimed subject matter.

Electronic control circuit

The present invention relates to a lighting unit having low and high light levels and employing an efficient arc lamp as the source of light during the high level setting. The unit employs a filamentary light source for the production of light during low light level operation, the filament acting as a resistive ballast for the arc lamp during high level operation. Practical embodiments operate in a conventional three-way light socket with the sequences being off, low, high and low, and off, low, high, and high.

Arc lamp lighting unit with low and high light levels

A device is provided for a meter having an indicator, e.g. a pointer, and which detects the presence or absence of the meter pointer at one or more set points or between two set points. The device does not alter the operation of the meter and may be coupled to an alarm or other signal, or it may be used to actuate a mechanism under control of the meter. The device comprises at least one light-emitting diode which produces radiation which falls on a specific area of the meter face and on the meter pointer (if it is within that area) and is reflected from the meter face (and the pointer) to a phototransistor or other suitable receiver which 'reads' the signal produced by the radiation reflected from the meter face and the pointer, if present in the area read. The device is mounted so that it can be moved to any desired area of the meter face. Preferably the device is mounted externally to the meter. However, it may be enclosed within the usual meter housing, without altering the operation of the meter.

Electrooptic meter pointer position detector

A method and apparatus for monitoring the buildup of fog in a non-silver free radical film while a latent image in said film is being optically developed, wherein the buildup of fog is sensed by radiation directed at a non-image area of said film and reflected from said area to a sensing device. The reflected radiation is altered as the buildup of fog takes place.

Reflectance probe

A method for monitoring the optical development of non-silver free radical film in which the fog buildup in a selected non-image portion of the film is used to control the intensity and/or duration of the development exposure so as to insure a desired level of contrast between image and non-image areas in the developed film.

Growing community of inventors

Wickliffe, OH, United States of America

Robert J Crosby