Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-01-14
1986-06-03
Rubinson, Gene Z.
Facsimile and static presentation processing
Facsimile
Recording apparatus
250353, 358206, H01J 3149
Patent
active
045933227
ABSTRACT:
Apparatus for continuously determining the position of best focus of an objective lens and a system having a video output. The technique uses a transmissive plate of variable thickness located on one side of the field stop of the optical system associated with the video output. The plate covers the full vertical field of the system and covers on the order of 30 to 40 resolution elements in the horizontal direction. The plate is divided vertically into platelets of different thicknesses which are distributed in such a way as not only to cover the range of defocus of the system, but to discriminate against possible variations in scene content. The plate is placed outside the active area which will be displayed by the video; therefore the variations in thickness and in focus introduced by the plate are not displayed on the video, but are only used for the purpose of continuously determining the position of best focus. A spherical shell of zero power may be placed between the objective lens and the field stop in order to create a bias so that focal shifts introduced by the plate may be distributed about a nominal position, rather than all in a positive direction.
REFERENCES:
patent: 4349843 (1982-09-01), Laakman
patent: 4383173 (1983-05-01), Neil
patent: 4404594 (1983-09-01), Hannan
Honeywell Inc.
Medved Albin
Rubinson Gene Z.
Schroeder L.
Solakian John S.
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