Light-emitting diode arrangement

Details Light-emitting diode arrangement Light-emitting diode arrangement

1980-07-28

1982-05-11

Lechert, Jr., Stephen J.

Illumination

Revolving

362231, 362235, 362249, 362293, 362311, 362800, 362804, F21V 704

Patent

active

043297374

ABSTRACT:
A light-emitting diode arrangement with a light-emitting diode that is light-transmissive in an axial direction of the type used in examining instruments for opthalmic optics. The light-emitting diode serves as a constant light source in conjunction with a diffusion disk, such as for fixation point stimuli, while the disk also serves as a stimulus that is lit by an additional, switchable light source, such as an incandescent lamp, whose light is transmitted through a light guide, such as an optical fiber, through the light-emitting diode to the disk. In a preferred embodiment, a color filter is arranged between the additional light source and the light-emitting diode and both the additional light source and light-emitting diode are axially displaceable relative to the diffusion disk so as to enable adjustment of their respective luminous densities.

REFERENCES:
patent: 4097917 (1978-06-01), McCaslin

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