JPS58128628A - Exposure unit for phosphor screen of color picture tube - Google Patents

Abstract

PURPOSE:To increase the coefficient of utilization of light and improve mass production by making the captioned exposure unit composed of a long light source, a slit section with the aperture length in the diametrical direction of this long light source and the aperture width in the lengthwise direction, and an oscillating mechanism that oscillates only the long light source. CONSTITUTION:A slit plate 25 that forms a slit section 24 with the specified wedged aperture width by means of a slit width regulator 22 and a shutter 26 are provided at top of a lamp house 21 that mounts a long light source 23 internally. Besides, the lamp house 21 is fit to a light source stage 28 that is provided so as to reciprocate for a fixed stand 27 and this stage 28 is designed to select the reciprocation of the optimum light source every types of tubes that are hooked to any of a number of hooking sections 32 implanted on a rotating plate 31 that is mounted on a motor 30 through a joint bar 29. Moreover, since the aperture lenght of the slit section 24 can be adjusted by a regulating block 33, the slit 24 can be selected in the optimum light source width and length.

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field of the Invention The present invention relates to an improvement in an exposure apparatus for a fluorescent screen of a color picture tube.

Technical background of the invention and its problems" As shown in Figure 1, a panel (1) of a color picture tube has band-shaped phosphor layers that emit light in red, edge, and blue colors on the inner surface (1).
When forming a phosphor screen by depositing the material vertically to the horizontal axis (X-X) of A shadow mask (2) having an electron beam passage hole (2,) as shown in Fig. 2 is mounted on a panel mounting table, and a panel with a phosphor slurry film containing a desired phosphor formed on its inner surface is mounted. Then, a band-shaped phosphor layer of a predetermined width is sequentially formed. In such an exposure apparatus, selection of the diameter of the exposure light source is an extremely important issue. That is, as shown in FIG. 3, a light beam from a light source (31) having a diameter (4) passes through an electron beam passage hole (2I) having a slit width (d+) of a shadow mask (2) to a panel (3).
All the moving parts (G) when shooting upward are the light source (3) and the panel (
1) If the distance between the inner surfaces is (Ll), and the distance between the inner surfaces of the shadow mask (2) and the panel (3) is !ql, then the following relationship is established, and this entire moving part (1) is the band-shaped phosphor layer. This is because it depends on the width +81.

On the other hand, the width (8) of the strip-shaped phosphor layer is the cuff-picture tube installation f.
The horizontal pitch (PH) of the electron beam passing hole portion (2,) of the shadow mask (2) determined on the ry floor v the light source (3)
) and the inner surface of the panel (11) 1111 (Ll , determined from the distance (ql) between the shadow mask (2) and the inner surface of the panel (1).

Therefore, in order to obtain a phosphor screen with good white uniformity in which the band-shaped phosphor layers of three colors do not protrude into or are missing from the phosphor layers of other colors, the relationship Y<8 is desirable.

However, in the first and second equations, tdl mountain 1(q)(
PH) is determined at the design stage of the color picture tube, so y<
In order to make it s, the diameter (4) of the light +1j f31 must be made small.

The radius of the light source (3) that satisfies this condition y<s can be obtained by expanding the first equation and substituting (81) in place of (7).

However, in recent years, color picture tubes with narrow necks have been developed as a measure to save energy, color picture tubes with wider band-shaped phosphor layers (81 It has become increasingly difficult to form a band-shaped phosphor layer using a fog light device in response to so-called fine-pitch color picture tubes with narrower widths (81).

In other words, in the case of a color picture tube with a narrow neck, since the electron gun is small, the shadow mask (2) and panel +11 are inevitably required.
The distance fql between the inner surfaces must be increased, and therefore a narrower light source diameter is required.

In addition, in the case of a color picture tube in which the width (8) of the band-shaped phosphor layer is increased, if the band-shaped phosphor layer of another color protrudes or is missing, there will be less margin, so the width of the band-shaped phosphor layer will be smaller. As a result, a narrower light source diameter is required.

In addition, in the case of a fine picture color picture tube, the second formula (
PH) becomes smaller, a smaller light source diameter is naturally required from the third equation.

The following is known as a conventional light source mechanism that meets the above-mentioned demands.

First, a light-shielding coating is optionally deposited on the outer tube of the light source. (Utility Model Application Publication No. 49-141751) Second, a shield having a slit opening is wrapped around the outer tube portion of the light source. (Japanese Utility Model Publication No. 1983-141757) Thirdly, a window is provided in a part of the national polity, and a light-shielding plate having a rectangular hole is provided inside the box. (Utility Model Application Publication No. 49-141752) The light source is vibrated to obtain a diameter of arbitrary thickness. (Japanese Unexamined Patent Publication No. 49-40666) Among these light source mechanisms, the first, second, and third structures include a lamp (3) around a lamp (3) having an inner radius as a light source, as shown in FIG. Provide a vapor deposit or shield (5) having a slit (4) at the radius (rl) from 3), and if the width of this slit (4) is (2a), then this slin) Wi6 (@41)
(2m) is the apparent light source diameter and the light divergence angle is (2'l)
Then, “ ” Sjn 61 ・・・・・・・・・
(4), and with this light divergence angle (2#1), it is impossible to illuminate the entire panel. Further, the structure #I4 cannot provide a light source that is smaller in diameter than the light source used, even if it is considered for the purpose. In other words, the minimum diameter of the light source currently available is 0.
8φ, but this has the disadvantage of short life, and in practical terms, the limit is 1Oφ.

In response to this, the inventors previously filed an application for a structure as shown in FIGS. 5 to 7.

In other words, a slit WaS having a width (2a) is placed parallel to the longitudinal direction of the light source 031 at a distance (hl) from the center of the light source 0 with a diameter (3), and this slit portion (141) is Distance 11 from light source a3 as the center
1 (It is a structure that vibrates in increments of 11. By creating such a structure, the apparent light source becomes the slit part (width (21) of 141), and the light divergence angle is ta, a, ==
j ” a) is doubled, and its practical value is greater than that of the first to fourth structures, but the sixth structure
As shown in Fig. 7 and Fig. 7, the opening width of this slit I (2
If a) is (5), the opening length of slit part a4 is ■), the vibration distance (21) of the multi-light source [131 is (Ll), and the effective light source length is (L,), then the light utilization rate (''l) is =W/L+X D/Lm ・--
(Represented by 51, there is a problem that this light utilization rate (α) is relatively low.

OBJECT OF THE INVENTION The present invention has been made in view of the above-mentioned problems,
It is an object of the present invention to provide an exposure apparatus having a light source section that allows the aperture width of a slit section to be the width of the light source and makes it possible to make the light utilization rate relatively high.

Summary of the Invention] That is, the present invention includes one or multiple light sources arranged in parallel in the radial direction;
The light source device includes a slit portion having an aperture length in the radial direction of the multi-light source and an aperture width in the longitudinal direction of the multi-light source, and a capture mechanism that vibrates only the multi-light source in the aperture length direction of the slit portion. The width of the aperture is narrower than that of multiple light sources, and the slit portion is used as an apparent light source to form a color picture tube phosphor screen with good productivity and quality.

Embodiment of the Invention] Next, an embodiment of the color picture tube phosphor screen exposure apparatus of the present invention will be explained with reference to FIGS. 7 to 9. A slit width adjuster E+ is provided with a slit plate k and a shutter (c) that form a slit portion having a predetermined wedge-shaped opening width, and a lamp house c! D is fixed to a light source stage (to) that is provided so as to be able to reciprocate with respect to a fixed base (c), and this light source stage (to) is connected to a rotary plate attached to a motor α via a connecting rod ■. Gl
The reciprocating movement of the light source can be selected depending on the type of tube by being locked to one of the plurality of locking portions (2) installed in the tube (1).

Further, since the opening length of the slit portion (2) can be adjusted by an adjustment program, the slit 341 can be selected to have the optimum light source width and light source length.

When forming a color picture tube phosphor screen using an exposure device equipped with a light source device having the structure described above, a motor (7) is used.
The lamp rotates only during the predetermined exposure time in conjunction with the shutter during exposure, and is changed into horizontal movement by the connecting rod (to), and the fixed lamp house is connected to this light source stage (c). It is designed to move along with the vibration.

By using a light source device with such a configuration, the slit part (2) becomes an equivalent light source, which is similar to the previous application, but the difference from the previous application is that the vibrational motion of the slit part (2) becomes an equivalent light source.
The multi-light source (c) is characterized by moving in the radial direction of the multi-light source (c) in the aperture length direction.

Next, the light utilization rate (α) according to the present invention is shown in FIGS. 11 and 12.
Obtain from the diagram.

That is, the opening width of the slit 34 is (b), the slit CJ41
The aperture length of (if DI and the previous application are the same, w/L, (Ll) is the vibration distance of the multi-light source (c).

Next, Figure 13 shows the applied power (VA) and illumination intensity (mW/ca) when only the self-effective length of multiple light sources with the same diameter is varied.
t). In the figure, the song l1I−υ is 1°φ
, when the effective length is 10IJ, the curve (6) is 1mφ effective length 15
At the time of g, the curve C3 shows the time when one angle φ effective length is 20w5.

However, the diagram is a curve group diagram in which the illuminance at 500 VA is assumed to be 1. What can be seen from the figure is that the illumination intensity is approximately proportional to the applied power, and the difference in the length between the electrodes, that is, the effective length, is reflected in the allowable applied power.

In Fig. 14, the relative illuminance is shown by the curve - when the effective length of the multi-light source is changed, with the opening length of the slit portion being 8°U, the applied power being 800 VA, and the long light source diameter being 1 mφ. The method for determining this curve (441) is to arrange multiple light sources with effective lengths parallel to the length direction of the opening of the slit section, place a light receiver on the outer wall in the center of the panel, and calculate the amount of light incident on this light receiver as a reference. The illuminance of a multi-light source with an effective length of 1 m is shown as 1oo.As can be seen from this figure, in the case of a multi-light source with a short effective length, however, when the effective length > the length of the slit part, the illuminance I is the lamp. This shows that the brightness is inversely proportional to the length.

That is, when considering based on FIGS. 13 and 14, when using slits having the same width (5) and the same length, the formula 5 of the prior application and the formula 6 of this embodiment If they are the same tube type and have the same lamp, (α) will be the same, but as can be seen from the above explanation, (Ll) is the same in the width direction of the slit throat.
Since the (L rack) is provided in the length direction of the slit section, it is possible to make <t, ., and productivity is improved by 5-Q.

In the earlier application and this example, when two light emitting sources are arranged in parallel at the pitch (PI), the earlier application's formula 145 is ``=(W/L+
10F) x (D/Lm)
2.=(7), and since DEW always holds true, (α1 in equation 7 becomes even larger).

Next, as a specific example, the values obtained when two rungs are used in the prior application and in this embodiment during exposure of a color picture tube phosphor screen with a 15" x 90" deflection are shown in Table 1 for comparison.

That is, compared to the previous application which used two light sources, an illumination of 4° was obtained.

(Effects of the Invention) As described above, according to the color picture tube phosphor screen exposure apparatus of the present invention, productivity is improved by more than 40% compared to the prior application using the same power, and the vibration of the light source and the aperture are reduced. Its industrial value is extremely great because a phosphor screen consisting of a phosphor layer, a light absorption layer, etc. can be formed using a narrow slit portion as the light source diameter without causing protrusion or chipping of the phosphor layer. .

[Brief explanation of drawings]

FIG. 1 is an enlarged plan view showing the band-shaped three-color G1 light layer deposited on the inner surface of the panel, FIG. 2 is an enlarged plan view showing the shadow mask, and FIG. 3 is the light 51. FIG. 4 is an explanatory diagram showing the relationship between a shadow mask and a panel, FIG. 4 is an explanatory diagram showing an example of the light source section of a conventional exposure apparatus, FIG. 5 is an explanatory diagram showing the light source section of the exposure apparatus of the prior application, and FIG. Figure 5 is an explanatory diagram of the relationship between the light source section and the panel viewed from the width direction of the slit.
An explanatory diagram of the relationship between the light source section and the panel shown in the figure, viewed from the length direction of the slit, and FIGS. 8 to 12 are diagrams showing an embodiment of the light fli section used in the exposure apparatus of the present invention, Figure 8 is an explanatory diagram of the main parts seen from the width direction of the slit, Figure 9 is an explanatory diagram of the main parts seen from the length direction of the slit, Figure @10 is a top view of the main parts, and Figure l11g11 is the light source section and panel. Fig. 12 is an explanatory diagram of the relationship between the light source section and the panel as seen from the length direction of the slit.
Figure 3 is a curve diagram showing the relative illuminance with respect to the applied power when the long light source diameter is the same and the effective length of the light source is changed. Figure 14 is a curve diagram showing the relative illuminance with respect to the applied power when the long light source diameter is the same and the effective length of the light source is changed. It is a curve diagram showing the relative 11j when the effective length is changed. 1. Panel 2. Shadow mask 3.13
．． 23.-Light source 4.14.24..Slit part 1
5.25...Slit plate 30...Motor 31...Rotating plate 33...Adjustment block agent Patent attorney
Inoue - Male Figure 1 Figure 2
3 Figure 4 Figure 5
Figure 6 Figure 7 Figure 10? μ Figure 13 Application/1Lt1 (VAxtDo) - Figure 14 (Koma?04 1t.

Claims (1)

[Scope of Claims] (111 long light sources arranged in parallel in the radial direction, a slit portion having an opening length in the radial direction of the long light source, the length #:, and an opening width in the length direction of the source, An exposure device for a color picture tube phosphor screen, characterized in that it is equipped with a light source device comprising a vibrating mechanism that vibrates only the long light source in the direction of the opening length of the slit section, 1. (2) The aperture width is long. A lightless device for color picture tube fluorescence according to claim 1, characterized in that the diameter is smaller than the diameter of the light source.