Signal lamps and apparatus

Details Signal lamps and apparatus Signal lamps and apparatus

2005-10-18

2005-10-18

Swarthout, Brent A. (Department: 2636)

Communications: electrical

Visual indication

Using light emitting diodes

C340S332000, C340S458000, C340S931000

Reexamination Certificate

active

06956494

ABSTRACT:
An LED signal lamp comprises at least two separate LED arrays which have separate power feeds and wherein the LEDs of the arrays are positioned with respect to each other such that when lit they provide a composite light signal output and such that when the LEDs of only one of the two arrays are lit they provide a light signal with a visible distinctive pattern. A distinctive pattern is revealed, either lit or dark. Typically this pattern may be formed as a letter such as “X” or “F” or may be formed as a striped effect, for example.An LED signal apparatus comprises input signal power supply terminals7,8for the apparatus; a series connection of switch means S1to S4and a ballast load6connected across the supply terminals7,8; an LED signal lamp1,2connected to the terminals to be supplied with current therefrom; and switch operating means D1to D4, in the supply path to the LED lamp, for controlling the state of the switch means S1to S4in the series connection, whereby total failure or substantially total failure of the current to the LED signal lamp results in said switch operating means D1to D4causing said switch means to open to disconnect the ballast load6from power from the supply terminals7,8.

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