Electric lamp and discharge devices – Cathode ray tube – Shadow mask – support or shield
Reexamination Certificate
1998-10-19
2002-05-14
Patel, Ashok (Department: 2879)
Electric lamp and discharge devices
Cathode ray tube
Shadow mask, support or shield
C313S404000, C313S407000, C313S269000
Reexamination Certificate
active
06388367
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an aperture grille used in a Trinitron brand color cathode-ray tube.
A related art Trinitron brand color cathode-ray tube includes a single electron gun for emitting RGB electron beams, a stripe phosphor screen, and an aperture grille as a color separating mechanism.
The aperture grille is provided in the cathode-ray tube so as to be opposed to the stripe phosphor screen provided on the inner surface of a front panel with a given space defined between the aperture grille and the phosphor screen, thereby leading the electron beams emitted from the electron gun to the phosphor screen.
FIG. 1
is a perspective view showing the configuration of such a related art aperture grille.
The aperture grille has a flat grille
10
formed with vertical stripes of slits
12
and line electrodes
14
by etching or the like of a soft steel sheet, and a steel frame member
20
to which the flat grille
10
is connected by welding or the like under a given tension.
The frame member
20
has a pair of first frames
22
A and
22
B connected to the vertical opposite ends of the flat grille
10
corresponding to the longitudinal opposite ends of the slits
12
, and a pair of second frames
24
A and
24
B connected to the horizontal opposite ends of the first frames
22
A and
22
B so as to extend between the first frames
22
A and
22
B.
Two damper lines
16
A and
16
B are provided on the surface of the flat grille
10
so as to extend in a direction perpendicular to the slits
12
.
The damper lines
16
A and
16
B function to suppress resonance of the flat grille
10
due to forced vibration by an external force. The damper lines
16
A and
16
B are supported under a given tension by two pairs of spring members
26
mounted on the second frames
24
A and
24
B, thereby keeping contact with the line electrodes
14
of the flat grille
10
.
In the related art aperture grille mentioned above, however, the damper lines
16
A and
16
B are located on a substantially central portion of the flat grille
10
in respect of its vertical direction. Accordingly, a part of each of the damper lines
16
A and
16
B is located inside an effective screen region of the cathode-ray tube.
As a result, there is a possibility that the damper lines
16
A and
16
B may come into sight from the front side of the screen, thus marring the appearance of the screen.
SUMMARY OF THE INVENTION
It is accordingly an object of the present invention to provide an aperture grille which can suppress vibrations of the flat grille without marring the appearance of the screen by not locating the damper lines inside the effective screen region of the cathode-ray tube.
According to the present invention, there is provided in an aperture grille for a cathode-ray tube, having a flat grille as an electrode sheet formed with vertical stripes of slits and line electrodes, and a frame member to which said flat grille is connected under a given tension, the improvement comprising a damper member exposed to a region of said flat grille outside an effective screen region of said cathode-ray tube and kept in contact with said flat grille to suppress vibrations of said flat grille.
With the above configuration of the aperture grille according to the present invention, vibrations of the flat grille due to forced vibration by an external force can be suppressed by the damper member kept in contact with the flat grille, thus preventing resonance of the flat grille. Furthermore, the damper member is out of sight from the front side of the screen of the cathode-ray tube, because the damper member is provided in a region of the flat grille outside the effective screen region of the cathoderay tube. Accordingly, vibrations of the flat grille can be suppressed without marring the appearance of the screen.
REFERENCES:
patent: 3638063 (1972-01-01), Tackikawa
patent: 4780641 (1988-10-01), Hashiba et al.
patent: 4827179 (1989-05-01), Adler et al.
patent: 5363011 (1994-11-01), Fendley
patent: 5369330 (1994-11-01), Aibara
patent: 5382871 (1995-01-01), Funahashi et al.
patent: 5406168 (1995-04-01), Takagi
patent: 5451833 (1995-09-01), Tong
patent: 6054803 (2000-04-01), Saita
patent: 07296739 (1995-11-01), None
patent: 10269961 (1998-10-01), None
Kananen Ronald P.
Patel Ashok
Rader Fishman & Grauer
Santiago Mariceli
Sony Corporation
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