Title:
フレネルレンズライト用、特にスポットライトあるいはフラッドライト用光学系
Document Type and Number:
Japanese Patent JP4792486
Kind Code:
B2
Abstract:
The optical system for the Fresnel lens light has an ellipsoidal reflector ( 1 ), a light source ( 2 ) and a Fresnel lens ( 3 ). The distance (a) between the Fresnel lens ( 3 ) and the reflector ( 1 ) is changeable but is related to the changeable distance (b) between the light source ( 2 ) and the reflector ( 1 ) so that the aperture angle of the propagated light beam is variable but illumination intensity of the propagated light is maintained uniform. Surfaces of the at least one Fresnel lens and/or the reflector can be structured to provide more uniform illumination of a given area. The optical system is useful for lights for film, stage, studio and photography.
Inventors:
Rüdiger Kittelmann
Harry wagner
Harry wagner
Application Number:
JP2008184507A
Publication Date:
October 12, 2011
Filing Date:
July 16, 2008
Export Citation:
Assignee:
Ower Lighting Game Behr
International Classes:
F21S2/00; F21S8/00; F21S10/00; F21V13/00; F21V14/02; F21V5/04; F21V7/22; F21V13/04; F21W131/406; F21Y101/00
Domestic Patent References:
| JP63012490B1 |
Attorney, Agent or Firm:
Yoshiaki Sato