Photoflash unit having optical system including aspheric lens to

Details Photoflash unit having optical system including aspheric lens to Photoflash unit having optical system including aspheric lens to

1982-01-21

1984-07-24

Lechert, Jr., Stephen J.

Illumination

Photographic lighting

Plural light sources or light source supports

362 17, 362240, 362241, 362308, 362335, 431365, G03B 1502

Patent

active

044620632

ABSTRACT:
A photoflash unit employing an optical system or apparatus with improved center beam candle power seconds and zonal lumen seconds from the flash lamp therein, said unit also employing a minimized utilization ratio of lamp-to-package cross-sectional area. Each individual lamp capsule comprises a reflective element, a refractive element (lens), and at least one photoflash lamp (light source). The lens provides for lamp shred magnification so as to fill the cell (capsule) width to thus provide maximum transfer of light to the subject on axis. One embodiment has the light source fused (glued) to the reflector and lens while a second embodiment has an air interface between the source and the optical elements. In both embodiments, the lens is aspheric and substantially covers both the reflector and source.

REFERENCES:
patent: 4136378 (1979-01-01), Chevali
patent: 4136379 (1979-01-01), Chevali
patent: 4172273 (1979-10-01), Schilling et al.
patent: 4234906 (1980-11-01), Schindler

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