Dual focus range apparatus for TV camera

Details Dual focus range apparatus for TV camera Dual focus range apparatus for TV camera

1989-06-21

1990-11-20

Brinich, Stephen

Facsimile and static presentation processing

Facsimile

Recording apparatus

358229, H04N 530

Patent

active

049722689

ABSTRACT:
A focusing system for closed circuit video cameras. A carrier block to which the image sensing device is attached is moved parallel to the lens axis for focusing images at close range because of the use of lenses normally focused at infinity or changes of focus required by system tolerances. The carrier block motion is accomplished by the use of two cams on a single shaft. The cams press against the carrier block and move the carrier block on guide rods as the cam shaft is turned. In order to attain two focusing ranges, the cam shaft itself is located within two pivoting saddles rather than being fixed. The saddles pivot on a fixed shaft which permits the entire focusing mechanism to be moved in one step between two preset positions. Each of the two positions is selected to be appropriate for one of two lenses.

REFERENCES:
patent: 3573367 (1971-04-01), LaRue
patent: 4369470 (1983-01-01), Contant
patent: 4392726 (1983-07-01), Kimura
patent: 4485406 (1984-11-01), Brownstein
patent: 4614974 (1986-09-01), Toyama
patent: 4725863 (1988-02-01), Dumbreck
patent: 4742401 (1988-05-01), Andree

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