Measuring and testing – Vibration – By mechanical waves
Patent
1997-02-26
1998-11-03
Williams, Hezron E.
Measuring and testing
Vibration
By mechanical waves
445 30, 445 64, 445 68, 73628, G01N 2900, B23P 1904
Patent
active
058311696
ABSTRACT:
A device for measuring a distance between a panel and a shadow mask included in a color CRT (Cathode Ray Tube) of the present invention includes a range finder having an emitter for emitting an ultrasonic pulse, and a receiver for receiving it. The emitter emits the ultrasonic pulse toward the inner surface of the panel on which the shadow mask is mounted. The distance or so-called Q value is measured on the basis of a lag between the time when a first reflection from the shadow mask reaches the receiver and the time when a second reflection from the inner surface of the panel reaches the receiver. The device is capable of measuring the Q value without resorting to the removal of the shadow mask, and measuring Q values even smaller than 5 mm without contacting the shadow mask. In addition, the device is easy to handle and small size.
REFERENCES:
patent: 3653112 (1972-04-01), Smith et al.
patent: 4056970 (1977-11-01), Sollish
patent: 4175441 (1979-11-01), Urbanek et al.
patent: 4606015 (1986-08-01), Yamaguchi
patent: 4979920 (1990-12-01), Nierenberg
Miller Rose M.
NEC Corporation
Williams Hezron E.
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