Shield-anode coating contactor and CRT incorporating same
AssigneePhilips Electronics North America Corporation
InventorGerald E. Van Buren
Life of this patent
Estimating the term…
Abstract
An improved IMS-anode coating spring contactor for a cathode ray tube (CRT) has a base with a semi-dart clip configuration and a tail extending from the base, which base and tail are interlocked in a set of two adjacent apertures in the IMS of the CRT. When assembled into a CRT, the body of the contactor is flexed, urging the head against the anode coating, and urging the base and tail against the edges of the apertures, thereby to achieve good electrical contact between the IMS and the anode coating.
Claims16
An IMS for a cathode ray tube comprising a bowl-shaped side wall, a rectangular bottom wall comprising two long sides and two short sides having inner edges defining a large central aperture for the passage of electron beams and means located in the bottom wall for receiving and retaining at least one IMS-anode coating spring contactor having a base portion with an opening and a tail portion, CHARACTERIZED IN THAT the means comprises for each contactor a set of first and second small apertures, these apertures adjacent one another along a line transverse to the inner edge of the side in which these apertures are located, the first aperture located adjacent the side wall of the IMS and adapted for receiving and retaining the base portion, and the second aperture located adjacent the large aperture and adapted for receiving and retaining the tail portion of the spring contactor.
A cathode ray tube comprising a glass envelope having a face panel portion, a funnel portion and a neck portion, a cathodoluminescent screen on the inner surface of the face panel, an aperture mask-frame assembly situated behind the screen, an aluminum layer overlying the screen and in contact with the mask-frame assembly, an IMS attached to the rear of the mask frame assembly, the IMS comprising a bowl-shaped side wall, a rectangular bottom wall comprising two long sides and two short sides having inner edges defining a large central aperture for the passage of electron beams and means located in the bottom wall for receiving and retaining at least one spring contactor, an electron gun including an anode in the neck, an anode coating on the inner surface of the funnel, at least one snubber contactor interconnecting the anode and the anode coating, and at least one spring contactor interconnecting the IMS and the anode coating, the contactor comprising a body portion, a head portion at one end of the body portion and a base portion at the other end of the body portion, the base portion attached to the IMS, the body portion extending between the IMS and the anode coating and urging the head portion into contact with the anode coating, CHARACTERIZED IN THAT the base portion of the contactor comprises two sides and an S-shaped portion connecting one of the sides with the other end of the body portion;
- a tail portion extends from the other side of the base;
- the receiving and retaining means in the IMS comprises for each contactor a set of first and second small apertures, these apertures adjacent one another along a line transverse to the inner edge of the side in which these apertures are located, the first aperture located adjacent the side wall of the IMS and adapted for receiving and retaining the base portion of the spring contactor, and the second aperture located adjacent the large aperture and adapted for receiving and retaining the tail portion of the spring contactor;
- the S-shaped portion of the base is urged against one edge of the first aperture and the other side of the base is urged against another edge of the first aperture, thereby retaining the base in the aperture, the tail portion is urged against the edges of the second aperture, thereby retaining the tail in the aperture;
- the region of the body adjacent to the S-shaped portion is urged against the bottom wall of the IMS, thereby to achieve a good electrical contact between the IMS and the anode coating.
An IMS-anode coating spring contactor for a cathode ray tube comprising a body portion, a head portion at one end of the body portion, and a base portion at the other end of the body portion, CHARACTERIZED IN THAT:
- (a) the base portion comprises two sides and an S-shaped portion connecting one of the sides with the body portion;
- (b) in that a tail portion extends from the other side;
- (c) in that the body portion and the tail portion are substantially coplanar;
- and (d) in that the base portion and the head portion extend above and below the coplane of the body portion and the tail portion, respectively.
An IMS for a cathode ray tube comprising a side wall, a bottom wall defining a large central aperture for the passage of electron beams, and means located in the bottom wall for receiving at least one IMS-anode coating spring contactor having a base portion with a opening and a tail portion, CHARACTERIZED IN THAT the means comprises for each contactor a set of first and second small apertures, the first aperture located adjacent the side wall of the IMS and adapted for receiving the base portion, and the second aperture located adjacent the large aperture and adapted for receiving the tail portion of the spring contactor.
A cathode ray tube comprising an envelope, a conductive coating on the inner surface of the envelope, an IMS, at least one contactor interconnecting the IMS and the conductive coating, the contactor comprising a body portion, a head portion at one end of the body portion and a base portion at the other end of the body portion, the base portion attached to the IMS, and the head portion being urged into contact with the conductive coating, CHARACTERIZED IN THAT the base portion of the contactor comprises two sides and an S-shaped portion connecting one of the sides with the other end of the body portion;
- a tail portion extending from the other side of the base;
- the IMS having a set of first and second apertures, the first aperture adapted for receiving the base portion of the contactor, and the second aperture adapted for receiving the tail portion of the contactor;
- the S-shaped portion of the base being urged against one edge of the first aperture and the other side of the base portion being urged against another edge of the first aperture, the tail portion being urged against an edge of the second aperture, the region of the body portion adjacent to the S-shaped portion being urged against the IMS.
Dependencies are inferred from the claim text.