TH59301A - Tension mask for cathode ray tubes. - Google Patents

Abstract

DC60 (21/11/45) This invention provides a tension mask for a cathode ray tube. The tension mask has an active slit formed by a number of parallel strips extending between the beams on opposite sides of the mask frame. The tension mask is further comprised of a dividing shield mounted above each end of the beams of the frame, which allows the ends of the strips to be attached to the beams in a predetermined manner. The dividing shields on opposite sides of the frame extend toward the active slits of the tension mask and are aligned with the CRT matrix. The tension mask has a lower coefficient of thermal expansion than the mask frame, beams, and dividing shields. This invention provides a tension mask for a cathode ray tube. The tension mask has an active slit formed by a number of parallel strips extending between the beams on opposite sides. The frame of the tension mask further incorporates a shield divider installed above each end of the frame's beam, which ensures the ends of the strip are securely and precisely separated from the beam. The shield dividers on opposite sides of the frame extend towards the active channel of the tension mask and align with the CRT matrix. The tension mask has a lower coefficient of thermal expansion than the mask frame, beam, and shield dividers.

Claims (10)

1. A tension mask for cathode ray tubes features an illuminated display on a panel consisting of a mask frame with two opposing sides, a beam attached to each opposite side of the frame, the mask itself attached to the beam with a number of parallel strips separated by long slits that serve as passages for the electron beam during tube operation, and a shield installed above the strips along each beam. 2. Tension masks as specified in Reputation 1, where the beams and shields acting as dividers are made of material with the first coefficient of thermal expansion and the strips are made of material with the second coefficient of thermal expansion. 3. Tension masks as defined in Claim 1, where the beam, dividing shield and strip are made of the same material. 4. An assembly of the frame of a tension mast as specified in Claim 2, where the first coefficient of thermal expansion is greater than the second coefficient of thermal expansion. 5. An assembly of the frame of a tension mast as specified in Claim 2, in which the first coefficient of thermal expansion is less than the second coefficient of thermal expansion. 6. Inside the cathode ray tube is an assembly of mask frames mounted within the tube, consisting of a rectangular mask frame with a pair of opposing beams, a tension mask with active slits created by several vertically spaced strips distributed between the beams, a shield acting as a divider mounted above the strips and fixed to the beams, and a tension mask with a lower coefficient of thermal expansion than the mask frame, beams, and divider shield. 7. A cathode ray tube as specified in claim 6, to which the shielding barrier extends toward the active channel of the tension mask. 8. The cathode ray tube as specified in claim 6, where the tension mask shall be made of Inva and the frame and beams and the dividing shield shall be made of steel. 9. A cathode ray tube as specified in claim 6, where the barrier shield is precisely fixed to the strip by means of adhesive prior to bonding, thus preventing any displacement of the strip during bonding. 10. A cathode ray tube as specified in claim 9, where the adhesive pathway shall be epoxy resin, acrylic resin, or silicate binder.