Darkroom illumination equipment

Details Darkroom illumination equipment Darkroom illumination equipment

1997-07-15

2000-11-07

Sember, Thomas M.

Illumination

Plural light sources

Particular wavelength

362249, 362293, 362800, F21V 900

Patent

active

061426474

ABSTRACT:
A casing of darkroom illumination equipment is composed of a base assembly and a lid. A substrate mounting light emitting diodes, a milky colored plate, a filter and a transparent plate are placed in the casing. The light emitting diode which emits the light for which spectrum has its peak at the wavelength of 585 nm is used so as not to affect photographic color paper. The filter eliminates the light having wavelengths in the lower slope apart from the peak in the spectrum and allows only the light having the wavelengths at the peak and in the proximity of the peak to pass through.

REFERENCES:
patent: 3971929 (1976-07-01), Erdell
patent: 4580196 (1986-04-01), Task
patent: 5028516 (1991-07-01), Mukunoki et al.
patent: 5161879 (1992-11-01), McDermott
patent: 5244776 (1993-09-01), Kawai
patent: 5329435 (1994-07-01), McQuire
patent: 5461551 (1995-10-01), Clayton

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