JPH0883569A - Inspection device of television picture tube panel - Google Patents

Abstract

PURPOSE: To quantitatively inspect a color mixing degree of respective color phosphor stripes formed on a panel inside surface. CONSTITUTION: In an inspection device of a television picture tube panel, phosphor stripes of red, green and blue are formed on a panel inside surface by using a color selecting mask. A light source 3 radiates ultraviolet rays to the inside surface side of a television picture tube panel 1 placed on an inspection stage 2 through the color selecting mask 8. A light source drive unit 4 movably supports the light source 3 in the direction X orthogonal to the stripe forming direction of the television picture tube panel. A spectrophotometer 5 takes in a light emitting spectral component of the phosphor stripes emitted by ultraviolet radiation through a light receiving probe 11, and separates it, and measures luminous intensity of respective colors. An inspection control unit 6 moves the light source 3 while monitoring the measured luminous intensity data, and detects a luminous intensity peak value of a light emitting spectrum with respective phosphor strips, and compares this with a luminous intensity peak value of the other phosphor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a picture tube panel inspecting apparatus suitable for inspecting the degree of color mixing of phosphor stripes formed on the inner surface of the panel.

[0002]

2. Description of the Related Art Generally, in the process of manufacturing a color picture tube panel, red, green, and blue phosphors are applied to the inner surface of the panel in a preset order, and drying, exposing, and developing treatments are performed for each fluorescent color. Finally, red, green and blue phosphor stripes are formed on the inner surface of the panel. At that time, for example, if red or blue phosphors are attached to the green phosphor stripes or if green or blue phosphors are attached to the red phosphor stripes, the chromaticity is defective in the assembly process of the picture tube. Occurs, and the assembling man-hours and parts cost up to that point are wasted. Therefore, in the process of manufacturing a conventional cathode ray tube panel, in order to inspect the degree of color mixture in the phosphor stripes of each color (how much other phosphors are mixed in the single color phosphor stripes), the inner surface of the panel is inspected. It was irradiated with ultraviolet rays through a color selection mask, and the spectrum of the phosphor stripes emitted by this was visually observed with a microscope, and based on that, evaluation such as quality judgment was performed.

[0003]

However, in the above-mentioned conventional example, since it depends on the visual ability of an expert who can determine a subtle degree of color mixing, even the same operator may have some variation in the inspection result. In addition, it is very difficult to match the level between workers, and it has been impossible to quantitatively inspect the degree of color mixture of the phosphor stripes of each color.

The present invention has been made to solve the above problems, and its purpose is to provide a picture tube capable of quantitatively inspecting the degree of color mixing of phosphor stripes of the respective colors formed on the inner surface of a panel. It is to provide a panel inspection device.

[0005]

The present invention has been made to achieve the above object, and is a picture tube panel in which red, green and blue phosphor stripes are formed on the inner surface of the panel by using a color selection mask. The inspection device is a light source for irradiating the inner surface of the picture tube panel placed on the inspection stage with ultraviolet rays through a color selection mask, and the light source is moved in a direction orthogonal to the stripe forming direction of the picture tube panel. A light source drive unit that supports it as much as possible and the emission spectrum component of the phosphor stripe that is made to emit light by ultraviolet irradiation from the light source are taken in through the light receiving probe, and the captured emission spectrum component is decomposed and the luminous intensity of each color is measured. While monitoring the spectrophotometer and the photometric data measured by this spectrophotometer, the light source is moved through the light source drive unit, Detects the luminous intensity peak value of the emission spectrum for each stripe, and includes an inspection control unit that compares the detected luminous intensity peak value with the luminous intensity peak value of another phosphor, and each color based on the comparison result of the inspection control unit. The configuration is such that the degree of color mixing of other phosphors in the phosphor stripe is inspected for each.

[0006]

In the picture tube panel inspection apparatus of the present invention,
The ultraviolet light emitted from the light source is applied to the inner surface of the panel through the color selection mask, and the spectral components of the phosphor stripes emitted by this ultraviolet irradiation are taken into the spectrophotometer through the light receiving probe. In the spectrophotometer, the emission spectrum components are decomposed and the luminous intensity of each color is measured, and this is supplied to the inspection control unit as luminous intensity data. The inspection control unit drives the light source drive unit while monitoring the light intensity data obtained by the spectrophotometer to move the light source by a constant amount in the direction orthogonal to the stripe formation direction. Then, ma of the emission spectrum component of the color to be inspected
When the x value exceeds the peak, the luminous intensity peak value is detected, and the detected luminous intensity peak is compared with the luminous intensity peak values of other phosphors. As a result, the degree of color mixture of the other phosphors in the phosphor stripe is quantitatively inspected for each color based on the comparison result in the inspection control unit.

[0007]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram for explaining an embodiment of an inspection apparatus for a picture tube panel according to the present invention. The inspection device for the picture tube panel shown in FIG.
An inspection stage 2 on which a picture tube panel 1 as an object to be inspected is mounted, a light source 3 for emitting ultraviolet light, a light source drive unit 4 for moving the light source 3, and an intensity distribution of an emission spectrum obtained by a spectroscope. Spectrophotometer 5 to measure electricity electrically
And an inspection control unit 6 for controlling the operation of the entire inspection apparatus
And is constituted by.

On the inspection stage 2, a panel support 7 made of, for example, resin is provided, and at the time of inspection, the picture tube panel 1 is placed on the inspection stage 2 by a panel transfer device (not shown) through the panel support 7. It is positioned and placed on.

The light source 3 irradiates the picture tube panel 1 mounted on the inspection stage 2 with ultraviolet rays through a color selection mask (for example, an aperture grill) 8, which is located below the inspection stage 2 in a predetermined manner. It is installed at a distance.
Further, between the inspection stage 2 and the light source 3, a shutter 9 for blocking the light beam emitted from the light source 3 by its own opening and closing operation, and visible light unnecessary for inspection from the light component emitted from the light source 3. A visible light cut filter 10 for removing is installed.

The light source driving unit 4 is for movably supporting the light source 3 in a direction X (in the present embodiment, the long side of the panel) orthogonal to the stripe forming direction of the picture tube panel 2. For example, although not shown, a rectilinear slide guide mechanism that slidably supports the light source 3 in a direction X orthogonal to the stripe formation direction, and an electric motor that serves as a drive source for moving the light source 3 via the rectilinear slide guide mechanism. Etc.

The spectrophotometer 5 takes in the emission spectrum component of the phosphor stripe of the picture tube panel 1 which is made to emit light by the irradiation of ultraviolet rays from the light source 3 through the light receiving probe 11, and is received by the light receiving probe 11. The emission spectrum component is transmitted to the spectrophotometer 5 via an optical transmission line 11a such as an optical fiber. In the spectrophotometer 5, the emission spectrum component taken in through the light receiving probe 11 is decomposed by its spectral function to measure the luminous intensity of each color, and the measurement result is used as the luminous intensity data of the spectrum for each color to inspect the control unit 6 Output to.

The inspection control unit 6 is, for example, a personal computer 1.
CPU (central processing unit) 1 built in the main body such as 2
2a and a light source controller 13 that controls the operation of the light source drive unit 4. A plotter type printer 14, for example, may be connected to the output terminal of the personal computer 12 as an additional hard copy function.

Next, the operation procedure of the panel inspection apparatus of this embodiment will be described. In the present embodiment, among the three color phosphor stripes of red, green and blue formed on the inner surface of the picture tube panel 1, the degree of color mixing in each phosphor stripe is, for example, in the order of green → red → blue. Shall be inspected. First, the picture tube panel 1 is set on the inspection stage 2 by a panel transfer device (not shown), and the light source 3 is made to emit light at an arbitrary position in this state, and the shutter 9 is opened to emit the ultraviolet light emitted from the light source 3. Irradiate the inner surface of the panel through the visible light cut filter 10. As a result, the ultraviolet rays UV emitted from the light source 3 pass through the holes (slit holes in this case) 8a of the color selection mask 8 as shown in FIG.
Of the red, green, and blue fluorescent stripes R, G, B formed on the inner surface of the panel, for example, the red and green fluorescent stripes R, G are reached and they are made to emit light.

Then, the red and green emission spectrum components Rs and Gs thus emitted are transmitted through the entire glass of the picture tube panel 1 and taken into the light receiving probe 11, which is then transmitted through the optical transmission line 11a. Be transmitted to. In the spectrophotometer 5, the red and green emission spectrum components Rs and Gs
Is measured to measure the luminous intensity of each color, and the measurement result is output to the inspection control unit 6 as luminous intensity data of the emission spectrum components Rs and Gs.

The inspection control unit 6 reads the luminous intensity data sent from the spectrophotometer 5 to determine a preset spectral component of the red and green emission spectrum components Rs and Gs, which is green emission in this embodiment. M of spectral component Gs
The ax value and the position of the light source 3 at that time are displayed on the personal computer 12.
Etc. in the memory. At this stage, since the ultraviolet rays UV emitted from the light source 3 are applied to only the red and green phosphor stripes R and G through the color selection mask 8, the photometric waveform obtained by the spectrophotometer 5 shows As shown in FIG. 4, the waveform Gw of the green emission spectrum component Gs and the waveform Rw of the red emission spectrum component Rs are detected.

Next, with the shutter 9 closed, the CP
The light source controller 13 is activated by the control signal from the U12a, and the light source drive unit 4 is driven to move the light source 3 in the direction X orthogonal to the stripe forming direction by a certain amount as shown in FIG. Then, in each case, the shutter 9 is opened in the same manner as described above to cause the phosphor stripe to emit light by irradiation with ultraviolet rays, and the position of the light source 3 at that time is determined along with the max value of the green emission spectrum component Gs which is the first inspection target. It is stored in the memory such as 12 at any time.

At this time, the CPU 12 of the inspection control unit 6
In a, the max value of the green emission spectrum component Gs captured last time and the emission spectrum component G of the same color captured this time
The max value of s is sequentially compared. Then, when the maximum value of the green emission spectrum component Gs exceeds the peak, the maximum value of the emission spectrum component Gs captured last time is detected as its luminous intensity peak value, and the light source drive unit 4 is driven to drive the luminous intensity peak. The light source 3 is returned to the position where the value is obtained, and the shutter 9 is opened again at that position.

In the state where this luminous intensity peak value is obtained, as shown in FIG. 6, the ultraviolet rays UV emitted from the light source 3 pass through the hole 8a of the color selection mask 8 and the green phosphor stripe G on the inner surface of the panel. It is in a state where it is irradiated only on. At this time, when the red phosphor r and the blue phosphor b are attached on the green phosphor stripe G, as shown in FIG. 6, the red color mixture component Gr is included in the green emission spectrum component Gs. And the blue color mixture component Gb. Therefore, in the light intensity waveform obtained by the measurement result of the spectrophotometer 5, as shown in FIG. 7, in addition to the waveform Gw of the green emission spectrum component Gs, the waveform of the emission spectrum component Gr of the red phosphor r is obtained. Rw and the waveform Bw of the emission spectrum component Gb by the phosphor of blue b are detected, and this is sent from the spectrophotometer 5 to the inspection control unit 6 as light intensity data.

As a result, in the inspection control unit 6, based on the luminous intensity data sent from the spectrophotometer 5, together with the luminous intensity peak value Gp of the green emission spectrum, other phosphors, that is, the red and blue phosphors r and b. The luminous intensity peak values Rp and Bp of the emission spectrum are read. Furthermore, the luminous intensity peak values Gp, R of the emission spectrum thus read
As a means for comparing p and Bp, for example, when the green light intensity peak value Gp which is the first inspection target is assumed to be 1, the ratio of the red and blue light intensity peak values Rp and Bp (Rp / Gp, Bp
/ Gp) is calculated as a color mixing ratio, and the degree of color mixing of other phosphors (red and blue phosphors) in the green phosphor stripe G is inspected based on the calculated result.

Incidentally, the inspection result obtained by the inspection control unit 6 is output on the monitor such as the personal computer 12 as a luminous intensity waveform diagram of the emission spectrum and transferred to the printer 14 as the inspection result data,
Then, it is printed out on the recording paper.

After inspecting the degree of color mixture of other phosphors in the green phosphor stripe G in this way, the degree of color mixture in the red phosphor stripe R is inspected by the same procedure as described above, and finally in the blue color. The degree of color mixture in the phosphor stripe B is checked and a series of operations is completed. In the above embodiment, the degree of color mixture in each color phosphor stripe is inspected in the order of green → red → blue, but the order of the fluorescent colors to be inspected can be arbitrarily changed. is there.

[0022]

As described above, according to the present invention,
The spectral components of the phosphor stripes emitted by the UV light from the light source are taken into the spectrophotometer via the light-receiving probe, and the spectrophotometer measures the luminous intensity of each color, and the inspection control unit also measures the luminous intensity of the spectrophotometer. While monitoring the data, the light source is moved to detect the luminous intensity peak value of the emission spectrum component of the color to be inspected, and by comparing the detected luminous intensity peak value with the luminous intensity peak value of other phosphors, the conventional method is used. It is possible to quantitatively inspect the degree of color mixing of other phosphors in the phosphor type without relying on the visual ability of a skilled worker.

As a result, it is possible to prevent the occurrence of chromaticity defects in the picture tube assembling process due to the variation in the inspection results of the workers, and it is possible to statistically manage the transition of the degree of color mixing over time. Therefore, the quality of the phosphor screen of the picture tube panel can be guaranteed with high reliability.
In addition, since it is possible to numerically grasp the change in the degree of color mixing due to process improvement and the difference in the degree of color mixing between models as inspection data, it is possible to conduct examinations for improving chromaticity that affects the quality of picture tubes. Is also very useful.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram illustrating an embodiment of a picture tube panel inspection device according to the present invention.

FIG. 2 is a diagram (No. 1) showing an ultraviolet irradiation state at the time of inspection.

FIG. 3 is a diagram (No. 1) showing a phosphor emission state at the time of inspection.

FIG. 4 is a waveform diagram (part 1) of an emission spectrum by a spectrophotometer.

FIG. 5 is a view (No. 2) showing a state of ultraviolet irradiation at the time of inspection.

FIG. 6 is a diagram (No. 2) showing a phosphor emission state at the time of inspection.

FIG. 7 is a waveform diagram (part 2) of an emission spectrum by a spectrophotometer.

[Explanation of symbols]

 1 picture tube panel 2 inspection stage 3 light source 4 light source drive unit 5 spectrophotometer 6 inspection control unit 8 color selection mask 11 light receiving probe

Claims (1)

[Claims] 1. A red-colored inner surface of a panel using a color selection mask.
A picture tube panel inspection device in which green and blue phosphor stripes are formed, comprising: a light source for irradiating ultraviolet rays through the color selection mask on the inner surface side of the picture tube panel placed on an inspection stage. A light source driving unit that movably supports the light source in a direction orthogonal to the stripe forming direction of the picture tube panel; and an emission spectrum component of the phosphor stripe emitted by the ultraviolet irradiation from the light source via a light receiving probe. The light source is moved through the light source drive unit while monitoring the light intensity data measured by the spectrophotometer and the light intensity data measured by each color by decomposing the captured emission spectrum component. The luminous intensity peak value of the emission spectrum is detected for each phosphor stripe, and the detected luminous intensity peak is detected. And an inspection control unit for comparing the luminous intensity peak value of another phosphor, and inspects the degree of color mixture of other phosphors in the phosphor stripe for each color based on the comparison result of the inspection control unit. An inspection device for a picture tube panel, which is characterized by: