JPS60253134A - Color picture tube - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] 20 The present invention specifically applies to a color picture tube of the type σ) having a mask portion attached to a peripheral frame suspended in relationship to form a cathode layer and a light emitting screen. Vcf-J Part 7 This relates to a novel means for reducing the small C microphonic (microphonic) imaging of the Yado mask.

[Background of the invention]

In the above-mentioned color image W, the precision with which the electron beam emitted from the electron gun impacts each elemental area of the cathode ray emitting strip 1 and 10 is determined by the apertures in the shadow mask and the size of the screen during operation of the tube. It is largely determined by the accuracy of alignment with the disjoint regions. Imaging of the shadow mask relative to the elementary area of the screen (μ) is generally disadvantageous, but if the imaging frequency of the mask beats the electron beam scanning frequency, the operation of the tube will be greatly disturbed.

The present invention changes the resonant frequency of the mask to eliminate the vibration beat between the scanning frequency and the i ft, thereby significantly reducing it.

[Summary of the invention]

The color picture tube according to the invention VC is improved by placing shims 2 on the proximal side of the mask proximate the corners of the mask and between the mask and the peripheral support frame.

With this shim KJ, the resonant frequency of the mask increases.

[Description of recommended examples]

1 and 2 show a color picture tube having an evacuated glass envelope 20 having a substantially rectangular faceplate panel 22 and a tubular neck 24 connected thereto by a funnel 261C. 18 is illustrated.

A faceplate panel has two mutually orthogonal axes, namely its wide direction (usually horizontal) and its long axis parallel to VC.
-X and the short axis Y-Y parallel to the narrow direction (usually vertical direction)
and have. The long and short axes are perpendicular to the central longitudinal axis 2-2 of the tube passing through the center of the neck 24 and the center of the panel 22.

Panel 22 has a viewing faceplate 28 and a peripheral flange or sidewall 30 sealed to funnel 26 with frit material 27. A three-exempt polar luminescent linear screen 32 is formed on the inner surface of the faceplate 28. This screen 32 is composed of phosphor lines 2'σ) extending parallel to the short axis Y-Yr of the tube. The screen 32σ]- portion is coated with a light-absorbing material as is well known. The master frame structure 33 has an L-shaped cross section, does not have a V rectangular shape, and is attached to the peripheral frame 35.
It consists of a rectangular perforated color selection element, that is, a blind mask 34, which is fixedly fixed thereto, and is detachably attached to the inside of the panel 22 by four springs 42VC at a predetermined distance from the screen 32. The mask 34 has a number of slit-shaped apertures arranged in parallel rows and separated by the slits in each row. Frame with cross section 351Cl
';j There are two flanges 36 and 37. The first flange 36 faces towards the hash line 32 and has a central longitudinal axis Z-
ZK are generally parallel to each other, and the second flange 37 faces inward and the central longitudinal axis Z-ZIC is perpendicular to K.
g I'm 'Q'. The mask 3alCU, the periphery that telescopically fits into the flange 36 of the frame, and the edge skirt 41 are also chemically formed.

The internal VC of the neck 24 has an in-line electron gun 39 (schematically shown in the figure) and three electron beams 38B, 3
8R and 38() and project them along coplanar convergent paths through mask 34 and onto screen 32.

This '1IlsH is designed for use with an external magnetic deflection yoke 40 surrounding the neck 24 and funnel 26 near their joint. When a suitable voltage is applied to this yoke 40, three beams 38B, 38R and 3
8G i;j Under the action of the orthogonal magnetic field, the screen 32 is scanned so as to draw a rectangular mask thereon.

5 and 4 show details of the structure of the master frame assembly 33. The shadow mask 34 has a central perforated portion 44 surrounded by a surrounding scarf 41VC. A plurality of tabs 46 extend from the tip of the skirt 41. At least 1ari/Yado Mask 3 in that tab
provided at each corner of 4. The tab 46 is fixed to the first flange 36 of the frame 35 by welding. skirt 4
The outer diameter of the first flange 36 is smaller than the corresponding inner diameter of the first flange 36, so that a gap 48 is formed between the skirt 41 and the first flange 36. The flanges 36 are disposed in the gap q) in contact with both flanges.

At the corners of the mask 34, 2BA shims 50 are provided on both sides of each tab 46. The shim 50 is welded to the frame 35.

In a color picture tube with a screen diagonal dimension of 68.58 cm (2 inches) and without shims as described in q) above, the mechanical resonance frequency of the shimmed mask portion near the corners of the mask is approximately 115 H2. full ivy. Such a vibration frequency interferes with the electron beam deflection frequency and creates an unsightly beat image.

When the mask moves on the Z axis, the skirt of the mask moves along the X-y axis.
The mask moves in the 1] direction, and the skirt moves inward. As shown in Figure 3, it is recommended to install shims between the skirt and the frame with a distance A (in this example, A = -38,1 Ijl or 1.5 inches) on each side of each corner. Mask resonance frequency 1j1
It rose to 45Hz. Due to this increase in resonance frequency, the unsightly beat image mentioned above has disappeared or been significantly reduced. Other forms of shims that increase the resonant frequency are also included in the spirit of the present invention. One such modification is to use bent wine tabs on the frame flange 3 instead of the shims mentioned above.
It is also possible to provide 6 VCs and make them contact the mask skirt 41 at the same positions as the 3 illustrated/person positions. Another variation is an outward flute that contacts the frame flange 36vC at the same shim location as shown.
1o may be formed.

[Brief explanation of the drawing]

Fig. 1 is a simplified sectional view taken along the longitudinal axis of the perforated mask-type picture tube according to the present invention, and Fig. 2 is a face plated 715 screen frame of the mask-type picture tube shown in Fig. 1. 3 is a partially cutaway Y-plane view of the corner portion of the mask-freight structure shown in FIG. 2, and FIG. 4 is a 4-side view of the corner portion of the master frame structure shown in FIG. 3. FIG. 4 is a cross-sectional view taken along line 4. 18...Color picture tube, 20...Envelope, 22...
・Foot 0 Ace plate panel, X-X...Long axis of face plate, Y-Y...Short axis of face plate 1.2-2...Central longitudinal axis of tube, 34.../Yado mask , 35... Peripheral frame, 36... Flange, 50. Patent Applicant: Earl Noney Corporay/Yon Agent: Shimizu % and 2 others 2/illustrator 2

Claims (1)

[Claims] 5(1) A face plate panel having a rectangular shape with a long axis and a short axis, and the central longitudinal axis of the tube passes through the center of the face plate perpendicular to both the long and short axes. The face plate panel has a shadow mask in the shape of a rectangle installed in the envelope and fixed at a plurality of points to a peripheral frame in the shape of a rectangle. The central longitudinal axis Vc of the tube is provided with a flange extending parallel to y and further disposed on an adjacent side of the mask, close to each corner of the mask and between the mask 1 and the flange 2-. A color picture tube characterized in that it has a shim that increases the resonant frequency of the mask.