Title:
LONG-LIFE FOCAL PLANE SHUTTER FOR RECONNAISSSANCE CAMERAS
Document Type and Number:
WIPO Patent Application WO2003032075
Kind Code:
A3
Abstract:
A shutter (20) for reconnaissance cameras includes a digital signal processor (102) system which provides for control of motors moving two curtains (24, 26). The curtains each define an edge, the gap between the edges of the curtain defines an exposure slit. The shutter replaces the prior art DC curtain motors and potentiometer curtain position sensing devices with AC motors having integral resolvers (32, 34) that provide motor shaft position feedback information.The AC motors having the integral resolvers are directly coupled to the shutter curtains. Precise control of the movement of the curtains and the widht of the exposure slit is therefor accomplished without a mechanical clutch or potentiometers.
Inventors:
RUCK RICHARD C (US)
MILWEE JOHN F (US)
QUINN JAMES P (US)
LUBOW ALAN (US)
HERNICZ RALPH (US)
CHIREMPES GEORGE S (US)
MILWEE JOHN F (US)
QUINN JAMES P (US)
LUBOW ALAN (US)
HERNICZ RALPH (US)
CHIREMPES GEORGE S (US)
Application Number:
PCT/US2002/028896
Publication Date:
November 06, 2003
Filing Date:
September 10, 2002
Export Citation:
Assignee:
RECON OPTICAL INC (US)
RUCK RICHARD C (US)
MILWEE JOHN F (US)
QUINN JAMES P (US)
LUBOW ALAN (US)
HERNICZ RALPH (US)
CHIREMPES GEORGE S (US)
RUCK RICHARD C (US)
MILWEE JOHN F (US)
QUINN JAMES P (US)
LUBOW ALAN (US)
HERNICZ RALPH (US)
CHIREMPES GEORGE S (US)
International Classes:
G03B39/00; (IPC1-7): G03B39/00; G03B9/34
Foreign References:
| US4235546A | 1980-11-25 | |||
| US4505559A | 1985-03-19 | |||
| US6336752B1 | 2002-01-08 |
Download PDF:
Previous Patent: LIGHT DIFFUSION FILM
Next Patent: BACKING SCREEN FABRIC FOR TRAVELLING MATTE COMPOSITIES
Next Patent: BACKING SCREEN FABRIC FOR TRAVELLING MATTE COMPOSITIES