Zoom lens focus control device for film video player

Details Zoom lens focus control device for film video player Zoom lens focus control device for film video player

1988-05-31

1990-04-24

Ng, Jin F.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358225, G02B 711

Patent

active

049204190

ABSTRACT:
A device (10) controls the focus in a film video player (11) for projection of at least a portion of a film image (F) onto a sensor (16) that generates a corresponding video signal from the sensor image. The film video player (11) has a fixed focal length lens (15) and includes a zoom motor (25) and related elements for changing the magnification of the sensor image with respect to the film image, sensor motor (34) and related elements for adjusting the focus of the sensor image, and a microprocessor (40) and related elements for determining the necessary adjustment to and for controlling the sensor motor to maintain the focus of the sensor image at any selected magnification without cam surfaces. Device (10) determines actual lens focal length upon power-up, eliminating focus variances due to manufacturing and installation, and maintains apparent zoom rate constant throughout the selected range of magnifications.

REFERENCES:
patent: 4506300 (1985-03-01), Fearnside
patent: 4642700 (1987-02-01), Ohta et al.
patent: 4742219 (1988-05-01), Ando

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