Shadow mask frame of a cathode ray tube, its process of manufacture, and suspension element of a shadow mask frame
AssigneeImphy S.A.
InventorJean-Pierre Reyal
Life of this patent
Estimating the term…
Abstract
The frame (30) comprises flat sides (30a, 30b, 30c, 30d) disposed along the lateral faces of a right prismatic surface. The sides (30a, 30b, 30c, 30d) of the frame (30) comprise an outer panel (31) and an inner panel (32) which are assembled and fixed to each other and are each constituted by a portion of a thin metal strip preferably reinforced by ribs. Devices (34) for suspending the frame (30) in the glass case of the cathode ray tube may be fixed by clipping or by welding on corner portions (33) of the frame (30).
Claims31
A Shadow Mask Frame of a cathode ray tube, and in particular a colour television tube, said frame having flat sides disposed along lateral faces of a right prismatic surface and having a stiffening edge portion for fixing a shadow mask on said frame which enables placing said shadow mask in position inside a glass case of said cathode ray tube, said case comprising a funnel and a slab comprising a screen, said flat sides of said frame comprising an outer panel and an inner panel which are brought together and fixed to each other, each panel being formed by a portion of a thin metal strip.
Process for manufacturing a shadow mask frame of a cathode ray tube, such as a colour television tube, having flat sides disposed substantially along the lateral faces of a right prismatic surface, said process comprising:
- cutting out from at least one thin metal strip at least one first panel and at least one second panel comprising, along the length of said metal strip, at least one region having the shape of a flat side of said frame to be produced so as to obtain for each of said sides of said frame to be produced, said at least one first panel and said at least one second panel which may be superimposed,
- producing in each of said at least one region of said at least one first panel and said at least one second panel press-formed reinforcing portions by deformation of the corresponding metal strip,
- assembling said frame by welding said at least one first panel and said at least one second panel in arrangements in which they are placed one against the other.
Suspension element for suspending a shadow mask frame inside a slab of a cathode ray tube, comprising a plate through which extends an opening for the engagement of said suspension element on a pin connected to said slab of said cathode ray tube, means for fixing said suspension element to a wall of said frame, said means for fixing said suspension element to said wall of said frame comprising in combination:
- an upright connected to said plate and having at least one tab for hooking on an edge of said wall of said frame,
- a spring projecting from an inner face of said upright which comes into contact with said wall of said frame, and
- at least one tongue portion substantially perpendicular to said upright and extending inwardly of said frame and comprising a hooking lug at the inner end thereof for fixing said suspension element on said frame by a clipping together, said hooking lug of said tongue portion being engaged on a retaining element of said frame and said spring being compressed between said upright and said wall of said frame.
Dependencies are inferred from the claim text.