JPH03214540A - Color picture tube fluorescent surface exposure device - Google Patents

Abstract

PURPOSE:To simplify the curved surface of a correction lens by separating it into correcting lenses for correction of light source position deviational difference, which are arranged for three different colors to correct the light source position deviational difference, and correcting lenses for correction of electron beam locus, which are common for three colors and are to approximate the light beam for exposure to the electron beam locus. CONSTITUTION:A correction lens 9 for correction of P is installed over a light source 4, and correction lenses 8B, 8G, 8R for correction of S are arranged over the first named correction lens 9. The light source 4 is located in exposure positions 4B, 4G, 4R according to the picture element to be exposed, and the correction lenses 8B, 8G, 8R for the three different colors are moved in synchronization with the motion of light source 4. Therein the S correction and P correction are made particularly by the correction lenses 8B, 8G, 8R and the one 9, respectively. Thereby the curved surfaces of both the correction lenses 8B, 8G, 8R and the one 9 are simplified, and the precision of fabrication is enhanced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an exposure apparatus for forming a fluorescent surface of a color picture tube.

[Conventional technology]

In the color picture tube K, as shown in FIG.
), green (G), and red (R). The three electron guns 1 are arranged at relative positions K such that the electron beams 2 emitted from the three electron guns 1 irradiate the same position at the center of the inner surface of the panel 3 with the three colors.
The funnel neck part K of the bulb is sealed.

By the way, since the electron beam 2 is deflected by the deflection yoke located outside the bulb, if the deflection center position is DL, then the point 4 where the electron beam 2 intersects with the DL line is
B, 4G, and 4R are the exposure light source positions of the exposure device. Therefore, the amount of deviation S1 of the exposure positions 4B, 4G, and 4R is smaller than the amount of deviation S0 of the three electron guns 1.

Therefore, in the fluorescent image exposure apparatus κ, as shown in FIG.
G, 4RK positions, and three color correction lenses 5B, 5
Exposure will be performed by switching between G and 5R. That is, for green exposure, the light source 4 is positioned at the exposure position 4G, and the correction lens 5 is
The inner surface of the panel 3 is exposed through G. For blue or red exposure, the light source 4 is placed at the exposure position 4B or 4RK, which is shifted by the amount of deviation S from the exposure position 4G, and the exposure is performed by switching to the correction lens 5B or 5R. In addition, in the figure,
6 shows a shadow mask attached to panel 3.

By the way, the correction lenses 5B, 5G, and 5R described above have the following functions.

At the time of phosphor surface exposure, as shown in FIG. 4, picture elements of three colors of green, blue, and red are formed from the projection K of the light source position deviation S1. That is, in the center of the panel 3, the light source positions 4B, 4G, 4R
The amount of deviation is S, but in the peripheral area of the panel 30, due to the difference in curvature and distance of the panel 30, the amount of deviation S, at the light source positions 4B and 4R is S, ≦StXSin+#, which is smaller than the SI value. It will be projected by value. Therefore, the correction K with the correction lenses 5B, 5G, and 5R, and the above S, are Sr.
Formation of a curved surface that is equivalent to *, that is, the difference in light source position and deviation (
ΔS) correction is required.

Further, as shown in FIG. 5, the electron beam 2 is deflected by the deflection yoke and irradiated onto the inner surface of the panel 3, and the locus of the electron beam 2 irradiates the corner portion of the panel 3 in a quadratic curve. It is necessary to form curved surfaces of the K correction lenses 5B, 5G, and SR so that the irradiation position K of the electron beam 2 coincides with the exposure light ray 7, that is, to perform ΔP correction to approximate the exposure light ray to the trajectory of the electron beam.

The conventional correction lenses 5B, 5G, and 5R have a curved surface shape that corrects the above-mentioned ΔS correction and ΔP correction with a single lens curved surface, and the curved surface shape is different for each color.

A related exposure apparatus of this type is disclosed in, for example, Japanese Unexamined Patent Publication No. 52-42072.

[Problem to be solved by the invention]

In the above conventional technology, since the correction lenses 5B, 5G, and 5R are manufactured including ΔS and ΔP correction, they are large in size and 1
For applications with products with strict performance characteristics such as color picture tubes with 10 degree deflection and high definition, correction lenses 5B and 5 are used.
There was a problem in that the curved surfaces of the G and 5R lenses were complicated and the manufacturing accuracy was poor.

In addition, since the trajectory of the electron beam 2 differs depending on the deflection yoke specifications and the influence of the earth's magnetic field, the correction lens 5B,
Improvements in 5G and SR will be necessary.

That is, even when changing the lens curved surface by improving only the ΔP correction, it is necessary to change the three colors of green, blue, and red, including the ΔS correction.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color tube fluorescence image exposure apparatus that can simplify the curved surface of a correction lens and improve manufacturing accuracy.

Another object of the present invention is to provide a color picture tube fluorescent surface illumination device that can easily accommodate K and κ when changing the correction lens to improve characteristics, etc., and can reduce the number of man-hours.

[Means to solve the problem]

In order to achieve the above objective, the correction lens is a three-color correction lens for correcting the light source position deviation difference of green, blue, and red, and a third correction lens that approximates the exposure light beam to the electron beam trajectory. It is formed separately from a correction lens for correcting the trajectory of an electron beam having a common color.

[Effect]

Light source position deviation difference (ΔS) correction and electron beam trajectory (ΔP)
Since the correction is performed using separate correction lenses, the curved surfaces of the individual correction lenses are simplified and manufacturing accuracy is improved.

Since the light source position is different for the three colors K, different correction lenses for the three colors are required for the ΔS correction. However, since the electron beam trajectory is determined by the deflection yoke characteristics and the influence of geomagnetism, Δ
The P correction lenses are the same for the three colors and can be used in common. Therefore, if it is necessary to change the correction lens to improve characteristics, etc., it is sufficient to change only the correction lens for ΔP correction.

〔Example〕

An embodiment of the present invention will be briefly described below with reference to FIG. 1K. In this example, the correction lens is used to adjust the light source position deviation difference between green, blue, and red (
The correction lenses 8B, 8G, and 8R for correcting the light source position deviation difference (MuS) and the exposure light! ! The common electron beam trajectory (ΔP) for the three colors approximates the electron beam trajectory (ΔP)K.
) It is formed separately from the positive lens 9 for positive vision.

Therefore, the Kusunoki positive lens 9 for positive κΔPH is arranged above the light source 4, and the correction lenses 8B, 8G, and 8R for KΔS correction are arranged above the correction lens 9 for ΔP correction. Then, the light source 4 is moved to exposure positions 4B, 4G, 4RK according to the picture element κ to be exposed.
position, and three color-specific ΔS correction lenses 8B, 8.
G and 8R are moved in synchronization with the movement of the light source 4.

In this way, since the K1ΔS correction and the ΔPm positive are corrected by the separate correction lenses 8B, 8G, 8R and 9, the individual correction lenses 8B, 8G, 8R and 90 curved surfaces are simplified and the manufacturing accuracy is improved. .

By the way, since the light source positions 4B, 4G, and 4R are different for the three colors κ, the correction lenses 8B, 8G, and 8R for ΔS correction are
K by color is required. However, since the electron beam trajectory is determined by the deflection yoke characteristics and the influence of the earth's magnetism, the ΔP correction lens 9 can be used in common for three colors. Therefore,
If it is necessary to change the correction lens to improve characteristics etc., please use △P.
This can be done by changing only the correction lens 9 for correction, and the number of man-hours can be reduced.

〔Effect of the invention〕

According to the invention K, since the correction lens is formed separately into a correction lens for ΔS correction and a correction lens for ΔP correction,
Improving the manufacturing precision of correction lenses will improve the quality of color cathode ray tubes. In addition, when improving the characteristics, K can be dealt with by changing the correction lens for ΔP correction, and the number of man-hours can be reduced.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing the arrangement of a correction lens in an exposure apparatus K according to an embodiment of the present invention, FIG. 2 is an explanatory diagram showing the positional relationship between an electron gun and a direct light source, and FIG. FIG. 4 is an explanatory diagram showing the arrangement of the correction lens in the head, FIG. 4 is an explanatory diagram of the three-color exposure principle, and FIG. 5 is an explanatory diagram showing the relationship between the electron beam locus and the exposure light beam. 4... Exposure light source, 4B, 4G, 4R... Exposure position, 8B, 8G, 8R... Correction lens for light source position deviation correction, 9... Correction lens for electron beam trajectory correction. Figure 1 T-6 Sakaki゜Correct Ff4#l゜Correct Race〉” Figure 2 Figure 3 Figure 2:z=22:t et al=””V6 Figure 4 Figure 5

Claims (1)

[Claims] 1. In a color picture tube fluorescence image exposure apparatus equipped with an exposure light source and a correction lens for correcting the movement of the exposure light beam emitted from the exposure light source, the correction lens may include green, blue,
It is separated into three color-specific light source position deviation correction correction lenses that correct the red light source position deviation difference, and a three-color common electron beam trajectory correction correction lens that approximates the exposure light beam to the electron beam trajectory. A color picture tube fluorescent image exposure device characterized by a color picture tube fluorescent image exposure device.