Photoflash unit with two-color indicator

Details Photoflash unit with two-color indicator Photoflash unit with two-color indicator

1977-10-25

1979-11-27

Padgett, Benjamin R.

Illumination

Photographic lighting

Measuring or indicating

362 11, 362 13, 362 16, G03B 1502

Patent

active

041763890

ABSTRACT:
A photoflash unit having a flashed lamp indicator comprising two layers of film having different colors, one of the layers being a heat-shrinkable material and the other layer being translucent and substantially unaffected by the heat of lamp flashing. An adjacent indicia sheet provides an aperture through which one of the indicator colors is visible. Upon flashing of an associated lamp, the heat shrinkable layer shrivels from view and the color of the other layer becomes visible through the aperture to clearly identify which lamp was flashed. In one embodiment, the two-color indicator is used to identify the last lamp flashed in a sequence, while each of the preceding lamps in the sequence has a respectively associated single-layer color indicator which shrinks away to leave a void upon flashing of the lamp.

REFERENCES:
patent: 3718815 (1973-02-01), McDonough
patent: 3894226 (1975-07-01), Hanson
patent: 3956625 (1976-05-01), Anderson
patent: 4048487 (1977-09-01), Kewley
patent: 4093979 (1978-06-01), Kewley et al.
patent: 4136379 (1979-01-01), Chevali

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