Differential rate double shutter for cinematographic digital...

Details Differential rate double shutter for cinematographic digital... Differential rate double shutter for cinematographic digital...

2005-04-05

2005-04-05

Nguyen, Judy (Department: 2851)

Optics: motion pictures

Shutters

Rotary

C352S166000

Reexamination Certificate

active

06874889

ABSTRACT:
A high resolution, high frame rate digital cinematographic camera system having an improved shutter system. An exemplary digital cinematographic camera system comprises a digital camera with an image sensor, a shutter drive motor, and a double shutter system. The double shutter system comprises primary and secondary shutter blades that revolve at differential rates. A preferred double shutter comprises a 1× rotation speed primary shutter blade with an adjustable open angle of 360 degrees minus the equivalent angle read-out time of the image sensor and a 2× rotation speed secondary shutter blade with a fixed open angle of 360 degrees minus the effective clear aperture at the shutter plane. The 2× rotation speed secondary shutter blade has leading and lagging edge rates that are twice the leading and lagging edge speed of the primary shutter blade to provide additional exposure time and readout time.

REFERENCES:
patent: 744251 (1903-11-01), Smith
patent: 4576456 (1986-03-01), Okino et al.
patent: 4592632 (1986-06-01), Renold
patent: 6734900 (2004-05-01), Mayhew

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