Dual reflected energy beam alignment system

Details Dual reflected energy beam alignment system Dual reflected energy beam alignment system

1985-10-18

1987-05-26

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Returned signal used for control

367111, G01S 1588

Patent

active

046690697

ABSTRACT:
An apparatus for properly aligning a cathode-ray tube projection unit before a viewing screen includes a pair of ultrasonic rangefinders and a cooperating pair of light emitting diode (LED) reader units. One ultrasonic rangefinder and one reader unit are connected to each of two opposite sides of the projection unit. Each rangefinder is directed toward the viewing screen to sense the distance between the viewing screen and the side of the projection unit to which the rangefinder is connected. The cooperating LED reader unit then indicates whether that side is too close to, too far away from or a proper operating distance from the viewing screen. A method for properly positioning the projection unit includes the steps of: (1) sensing the respective distances between opposite sides of the projection unit and the viewing screen; (2) indicating whether the opposite sides are too close to, too far away or a proper operating distance from the viewing screen; and (3) adjusting the positioning of the unit as indicated.

REFERENCES:
patent: 2629082 (1953-02-01), Hare
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patent: 3435232 (1966-03-01), Sorensen
patent: 3635551 (1972-01-01), Szymber
patent: 3650615 (1972-03-01), Aoki et al.
patent: 4085425 (1978-04-01), Hamill
patent: 4327427 (1982-04-01), Hotta et al.
patent: 4344160 (1982-08-01), Gabriel et al.

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