Cathode ray tube mask frame assembly

Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C313S404000

Reexamination Certificate

active

06597095

ABSTRACT:

FIELD OF THE INVENTION
This invention generally relates to cathode ray tubes (CRTs), and more particularly, to a shadow mask frame assembly for CRTs that eliminates the use of separate corner brackets for supporting the frame assembly within CRTs.
BACKGROUND OF THE INVENTION
A color cathode ray tube, or CRT, includes an electron gun for forming and directing three electron beams to a screen of the tube. A shadow mask, which may be either a formed mask or a tension mask having strands, is located between the electron gun and the screen. The electron beams emitted from the electron gun pass through apertures in the shadow mask and strike the screen causing the phosphors to emit light, so that an image is displayed on the viewing surface of the faceplate panel.
Present CRTs use steel frames to support the shadow mask within the faceplate panels of the tubes. Typically, such frames incorporate two long sides to which the mask is attached, two short sides perpendicular to the long sides and four corner brackets. The short sides are open at the ends, and a substantially flat corner bracket is used to provide the required strength in each corner. All parts are typically assembled by welding.
Because a plurality of parts and extensive welding is employed to make the frame, the ability to control the initial dimensions of the frame at fabrication, as well as dimensional changes during mask/frame assembly and processing, is extremely difficult. Additionally, dimensional inaccuracies affect the ability to attach springs or clips that support the frame in the proper location and orientation.
It is desirable to develop a mask frame assembly that reduces complexity and material usage of the frame without compromising the strength of the frame. Reducing the number of parts and the associated welding will improve the dimensional control of the frame at fabrication, reduce the propensity for dimensional changes during mask/frame assembly and processing, and reduce cost. Further, facilitating in-situ forming of the clip/spring attachment zone will improve the reliability of the structural detail.
SUMMARY OF THE INVENTION
This invention relates to a CRT having a tension mask frame assembly comprising a substantially rectangular support frame having two long sides, two short side, four corners and a tension mask attached to the two long sides of the support frame. The assembly includes closed ends at each of the corners, wherein the closed ends are contiguous with one of the adjacent sides at respective corners and each of the closed ends has a plurality of walls forming a closed corner portion between the long side and the short side of the support frame and including an angled mounting wall for use in suspending the mask within the color cathode ray tube.


REFERENCES:
patent: 4599533 (1986-07-01), Ragland
patent: 4728853 (1988-03-01), Sone et al.
patent: 5003218 (1991-03-01), Gijrath et al.
patent: 5072151 (1991-12-01), Spina
patent: 5103132 (1992-04-01), Van Der Bolt et al.
patent: 5214349 (1993-05-01), Sakata et al.
patent: 5644192 (1997-07-01), Ragland, Jr.
patent: 5898259 (1999-04-01), Reyal
patent: 6215237 (2001-04-01), Tsuchida et al.
patent: 6268688 (2001-07-01), Tani et al.
patent: 2001/0002352 (2001-05-01), Mizuta et al.
patent: 2002/0024282 (2002-02-01), Tani et al.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Cathode ray tube mask frame assembly does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Cathode ray tube mask frame assembly, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Cathode ray tube mask frame assembly will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3062031

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.