Kinescope screen center locator

Details Kinescope screen center locator Kinescope screen center locator

1979-12-27

1981-04-07

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

316 1, 315398, 250561, H04N 702, H01J 942, H01J 2954

Patent

active

042610133

ABSTRACT:
An apparatus for locating the position of the horizontal centerline on the display screen of a television kinescope comprises two screen edge sensors disposed at the top and bottom of the display screen. The edge sensors are mounted on a vertically movable member at a separation equal to the vertical dimension of the display screen. Each edge sensor comprises a light source for directing a beam of light at the kinescope along a first light path and a detector for sensing the different amount of radiation returned from the display screen and the adjacent reflective aluminum coating along a second light path. The sensors are moved until the detector outputs are equal, indicating the sensor is located at similar positions with respect to the top and bottom screen edges. The mid-point between the sensor is then the location of the horizontal centerline of the display screen.

REFERENCES:
patent: 3541255 (1970-11-01), Yazigi
patent: 4035834 (1977-07-01), Drury
"Laser Trimming of Monolithic Circuits", Electronics, Sep. 27, 1979, (Advertisement by Teradyne).

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