Optical device and light source

Details Optical device and light source Optical device and light source

2005-12-19

2010-10-19

Koval, Melissa J (Department: 2862)

Photography

Flash system responsive to focal length or distance

Illumination angle responds to focal length or distance

C396S175000, C396S429000, C359S019000, C359S742000, C359S743000, C359S619000, C362S244000, C362S311010, C362S311060

Reexamination Certificate

active

07817909

ABSTRACT:
An optical device directs light from a light source to a region of space, such as the field of view of a camera when the optical device is used as a camera flash unit. This device includes a first optical element which converges light from the light source towards an inner portion of the region to be illuminated and a second optical element which diverges part of the light from the first element outwardly towards an outer portion of the region to be illuminated so as to achieve adequate central illumination with improved uniformity of illumination across the region to be illuminated. The second optical element may have a concave multiple-faceted surface comprising plane facets in the shape of an open-base inverted truncated pyramid, contiguous sector-shaped facets, at least some of which are concave, or a face divided into an elongate portion disposed between first and second diverging portions.

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International Search Report dated Jul. 7, 2006, directed to counterpart International Application No. PCT/JP2005/023698.

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