George Douglas Haville

45047766, Mar 12, 1985

Nov 12, 1980

6/205941

George D. Haville - Santa Barbara CA

BEI Electronics, Inc. - Little Rock AR

H05B 3702

323288

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.

44279728, Jan 24, 1984

Oct 23, 1981

6/314204

George D. Haville - Santa Barbara CA
Paul A. Johnson - Santa Barbara CA

BEI Electronics, Inc. - San Francisco CA

H03K 1300

340347P

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.

43833179, May 10, 1983

Oct 30, 1980

6/202165

George D. Haville - Santa Barbara CA

BEI Electronics, Inc. - Little Rock AR

G06F 1110
H03K 1334

371 51

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.