Craig S Gray

US Patent:

53133358, May 17, 1994

Filed:

Jun 5, 1992

Appl. No.:

7/894672

Inventors:

Craig S. Gray - Walton IN
Christopher M. Hogge - Albuquerque NM

Assignee:

Delco Electronics Corporation - Kokomo IN

International Classification:

G02B 508
G02B 520
G02B 2700
B60R 112

US Classification:

359839

Abstract:

A display apparatus for blindzone signal indication comprises an exterior rear view mirror housing and an exterior rear view mirror disposed in the exterior rear view mirror housing. The exterior rear view mirror defines a portion from which light is reflected and a portion through which light may be transmitted from inside the rear view mirror housing. A light source mounted within the housing is located at the light transmissive portion of the mirror and a directional filter located at the light transmitting portion of the mirror filters light emitted by the light source so that a signal from the light source may be seen from the interior of the vehicle, but may not be seen by drivers of other vehicles.

US Patent:

54632781, Oct 31, 1995

Filed:

Aug 1, 1994

Appl. No.:

8/283323

Inventors:

Craig S. Gray - Walton IN

Assignee:

Delco Electronics Corporation - Kokomo IN

International Classification:

H05B 3702

US Classification:

3151691

Abstract:

Radiated emission is reduced in a vacuum fluorescent tube having a pulsed filament current in a variable frequency range above audible frequencies. A driver circuit produces a fixed width pulse of filament current when triggered by a random frequency generator. The frequency generator comprises a shift register and XOR gates intercoupled to generate a random series of logic outputs, a filter to produce a randomly varying voltage from the logic outputs, and a voltage-to-frequency converter responsive to the filter voltage to yield a random frequency in the required range. The random frequency triggers the driver and clocks the shift register.