Bei Electronics LLC

George D Haville

Paul A Johnson

A power saving regulated light source circuit, comprising a light emitting diode (LED), a direct current source and a switching transistor connected in series with the LED, a control voltage producing resistor connected in series with the LED to produce a control voltage corresponding to the current through the LED, a storage capacitor connected in parallel with the series combination of the LED and the resistor, a comparator having its output connected to the input of the transistor, the comparator having a reference input and a control input, a stabilized biasing source for supplying a stabilized reference voltage to the reference input, the control input of the comparator being connected to the control voltage producing resistor, the comparator having a high output state when the reference voltage exceeds the control voltage while having a low output state when the control voltage exceeds the reference voltage, the transistor being conductive in response to the high state while being nonconductive in response to the low state, the transistor when conductive being effective to charge the capacitor and to increase the control voltage, whereby the comparator is cycled between the high and low output states while the transistor is cycled between conductive and nonconductive states.

Power saving regulated light emitting diode circuit

An encoder for producing multidigit code word signals corresponding to the position and movement of a shaft or some other movable member, comprising a housing, a photocell board or some other signal producing board mounted on the housing and having photocell means or some other signal producing means including a multiplicity of signal channels for supplying a multiplicity of electrical signals indicating the position and movement of the code member, a plurality of circuit boards mounted on the housing in stacked relation to the signal producing board, the circuit boards including means for processing the signals from the signal producing means, and a multiplicity of sockets and pins mounted on the boards and plugged into one another for establishing electrical connections between the successive boards.

Positional encoders with plug-together modules

An encoder system which provides non-power of two, unambiguous, even counts, the system having a modular configuration to permit a substantial portion of the system to comprise standardized modules, wherein modifications to a minimum of modules provide a wide range of different system counts, the system utilizing a truncated, symmetric, unit step code sequence and a division of processing functions among modules which permits the user to select among system outputs having a number of different processing levels.

Modular shaft encoder system for non-binary counts

A shaft angle encoder for producing a multiplicity of output signals corresponding to a multidigit binary code word representing the angular position of the shaft, comprising a rotatable code member having a multiplicity of code tracks ranging in order from zero to n except for the omission of a skipped track having the order of n minus 1, the track of zero order having the largest divisions while the track of the order n has the finest divisions, transducer means for reading the tracks and producing corresponding electrical signals, a parity detector having inputs for receiving the electrical signals corresponding to the tracks having the orders of zero through n minus 2 and for producing a corresponding even/odd output, and an exclusive OR logic gate having inputs for receiving the even/odd output of said parity detector and the electrical signal corresponding to the track of the order n, the exclusive OR gate producing an output which synthesizes the electrical output signals corresponding to the skipped track of the order n minus 1. The track of the order n may be a sine track to produce a sine wave electrical signal, which is digitized before being supplied to the exclusive OR logic gate.

Shaft angle encoder having a circuit for synthesizing a skipped track

A frequency multiplying circuit for producing double frequency sine and cosine output signals sin 2x and cos 2x from sine and cosine input signals sin x and cos x, comprising two multiplier circuits, each having an output e.sub.0 and four inputs a.sub.1, a.sub.2, b.sub.1 and b.sub.2 and being adapted to perform multiplication in accordance with the following relation:

Frequency multiplying circuit for an optical encoder

The relative transverse velocity between a local station and a zone of reference or observation is measured by providing first and second directional radiation receiving devices at the local station, such devices being aimed along parallel paths extending to the zone of reference. Such paths are spaced apart by a predetermined transverse distance. The first and second radiation receiving means include respective first and second converting means for converting the received radiation into first and second electrical signals. Any transversely moving radiation feature produces corresponding signal features in such first and second signals, such signal features being staggered with respect to time. The lapse of time between such staggered signal features is determined by time lapse measuring means. The velocity of such transverse movement is inversely proportional to such time lapse. The time lapse is preferably divided electronically into a constant which represents such transverse distance and a scale factor, to produce a quotient which is a direct measure of the velocity. The time lapse may be measured electronically with a high degree of accuracy. The received radiation may be either light focused by first and second optical systems, or radio waves received by first and second directional radio antennas connected to first and second radio receivers. The local station may be stationary, in which case the system may be employed to measure the velocity of objects or features in the zone of reference. Alternatively, the local station may be mounted on a movable vehicle, such as a helicopter, for example, in which case the system may be employed to measure the velocity of the vehicle relative to the zone of reference, which may be the terrain over which the helicopter is flying, for example. The velocity measuring system is adaptable to the measurement of the range and dimensions of objects in the zone of reference.

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Santa Barbara, CA, United States of America

George D Haville