Determining boundaries of a transparent tube

Details Determining boundaries of a transparent tube Determining boundaries of a transparent tube

1978-08-17

1980-09-02

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358106, 358107, 358225, 356239, 356240, H04N 718

Patent

active

042209668

ABSTRACT:
The inner wall of a cylindrical glass envelope is delineated by a combination of a diffused light source and peripheral shutters placed behind the envelope. The precise position of the shutters is adjusted to block some of the peripheral light from the source from reaching the envelope. When the article is viewed from the front, dark lines delineate the lateral extent of the inner wall of the envelope. With the help of such a delineation it is possible to check the accuracy of the assembly of contacts in a miniature mercury-wetted sealed contact switch relative to the inner surface of its glass envelope.

REFERENCES:
patent: 3565536 (1971-02-01), Wuellner
patent: 3679820 (1972-07-01), Montone
patent: 4121247 (1978-10-01), Henry
patent: 4135204 (1979-01-01), Davis

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