Optical: systems and elements – Light control by opaque element or medium movable in or... – With rotating or pivoting element
Reexamination Certificate
2006-09-26
2006-09-26
Phan, James (Department: 2872)
Optical: systems and elements
Light control by opaque element or medium movable in or...
With rotating or pivoting element
C359S230000, C359S233000, C396S241000
Reexamination Certificate
active
07113318
ABSTRACT:
It is an object of this invention to independently control the F-number and the number of light attenuation steps of a multi-density ND filter by using a light amount control apparatus using an iris stop and the ND filter. The iris stop mechanism made up of a plurality of aperture blades and the ND filter having a multi-density pattern are stacked in a single unit. This simultaneously realizes continuous control of the F-number, multi-step control of the light attenuation ratio of the ND filter, a substantially circular stop aperture, and a uniform transmittance distribution in the stop aperture. In the first embodiment, the driving region of an actuator is divided into an ND control region and aperture control region. This makes it possible to independently control the F-number and the number of ND steps by the single actuator.
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English Abstract for Japanese Patent Application Laid-Open No. 11-218797.
English Abstract for Japanese Patent Application Laid-Open No. 2000-155352.
English Abstract for Japanese Patent Application Laid-Open No. 2000-106649.
English Abstract for Japanese Patent Application Laid-Open No. 2002-064745.
English Abstract for Japanese Patent Application Laid-Open No. 2002-204390.
Kashiwazaki Akio
Miyazaki Takeshi
Namazue Eriko
Onuki Ichiro
Canon Kabushiki Kaisha
Morgan & Finnegan L.L.P.
Phan James
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