04988188 is referenced by 86 patents and cites 10 patents.

An illumination device includes a light source; a secondary light source forming system for forming predetermined secondary light sources by use of light from the light source, the secondary light source forming system including a plurality of lens array units disposed in the direction of an optical axis and each having a plurality of lens elements distributed in a plane perpendicular to the optical axis; an optical system for directing light from the secondary light sources to a surface to be illuminated; and an actuating device for displacing at least one lens array unit in the direction of the optical axis to adjust the illuminance distribution on the surface being illuminated, while maintaining a substantially constant range of illumination on the surface being illuminated.

Title
Illumination device
Application Number
7/238592
Publication Number
4988188
Application Date
August 31, 1988
Publication Date
January 29, 1991
Inventor
Masakatsu Ohta
Kawasaki
JP
Agent
Fitzpatrick Cella Harper & Scinto
Assignee
Canon Kabushiki Kaisha
JP
IPC
G03B 27/32
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