Neck cleaning method for a CRT
AssigneeThomson Licensing
InventorsJohn Stephen Farrah, Donald Walter Bartch, Leonard Pratt Wilbur, Jr.
Life of this patent
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Abstract
A method of cleaning the neck of a funnel of a CRT during the manufacture thereof. The method comprises: inserting a drain tube within the neck, wherein a gap exists between the drain tube and the neck; directing a fluid through the gap; and draining the fluid that was directed through the gap through the drain tube, whereby the fluid removes material from the neck that was applied during a prior coating process and any dirt. The drain tube is part of a cleaning apparatus that further comprises a housing and a labyrinth flow controller positioned within the housing adjacent to the drain tube forming a laminar flow section whereby fluid is directed through the housing and into the tube.
Claims8
Apparatus for cleaning a neck of a funnel of a cathode ray tube comprising:
- a cleaning unit, said cleaning unit comprising a sidewall having a top end and a bottom, said sidewall and bottom forming a housing surrounding said neck;
- a drain tube, extending through said bottom of said housing into said neck to a predefined position within said neck below said top end of said housing;
- and
- a labyrinth flow controller positioned within said housing adjacent to said drain tube forming a laminar flow section whereby a flow of fluid is directed through said housing and along an inside surface of said neck and into said end of said drain tube.
Dependencies are inferred from the claim text.