Metal working – Barrier layer or semiconductor device making – Barrier layer device making
Patent
1976-05-03
1977-03-08
Lazarus, Richard B.
Metal working
Barrier layer or semiconductor device making
Barrier layer device making
29 2519, H01J 926
Patent
active
040105253
ABSTRACT:
This disclosure depicts a method for use in the manufacture of a rectangular shadow mask-type color television picture tube including a flangeless, curved faceplate having a central axis, a convex front surface, and a concave rear surface with a phosphor screen deposited on a central portion thereof. The faceplate also has four shadow mask suspension studs extending from the rear surface of the faceplate, one in each peripheral corner region of the faceplate, and a shadow mask suspended from the studs. The tube also includes a funnel having a central axis and a neck attached to a rectangularly cross-sectioned flared portion, the flared portion having a seal land which mates with the concave rear surface of the faceplate. The seal land has deposited thereon a cement for sealing the faceplate to the funnel. The flared portion of the funnel also has corner notches in at least three corners of the funnel, the notches receiving the studs on the faceplate when the faceplate and funnel are assembled, the studs and the notches constituting an internal referencing system for the faceplate and the funnel. The method for assembling the faceplate to the funnel comprises orienting the faceplate, concave rear surface down, with the faceplate central axis parallel to a predetermined reference axis and the faceplate being angularly positioned to coincide with a predetermined faceplate theta position, the orienting being effected by engaging the studs on the faceplate with simulated funnel inside corner notches on a faceplate aligning means; orienting the funnel, flared portion up, with the funnel central axis parallel to the predetermined reference axis and the funnel being angularly positioned to coincide with a predetermined funnel theta position, the orienting being effected by engaging the notches in the funnel with simulated studs on a funnel aligning means, the simulated studs and simulated notches being theta-referenced each to the other, i.e., the angular orientation of each to the other is at all times known; locking the faceplate such that the faceplate central axis is parallel to the predetermined reference axis, and such that the theta referencing to the funnel is preserved; disengaging the faceplate aligning means from the faceplate; locking the funnel such that the funnel central axis is parallel to the predetermined reference axis and such that the theta referencing to the faceplate is preserved; disengaging the funnel aligning means from the funnel; effecting relative motion of the faceplate and the funnel parallel to the reference axis and in planes perpendicular to the reference axis while preserving the theta referencing to cause the studs on the faceplate to engage the notches in the funnel.
REFERENCES:
patent: 3787937 (1974-01-01), Palac
patent: 3807006 (1974-04-01), Segro et al.
patent: 3816891 (1974-06-01), Fassett
Baur Leslie L.
Hajduk Thaddeus J.
Garrett John R.
Lazarus Richard B.
Zenith Radio Corporation
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