JP3297786B2 - Inspection device for picture tube panel - Google Patents

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 inspection apparatus suitable for use in 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 a panel in a predetermined order, and dried, exposed, and developed for each fluorescent color. , And finally, red, green, and blue phosphor stripes are formed on the inner surface of the panel. At this time, for example, if red or blue phosphor adheres to the green phosphor stripe or green or blue phosphor adheres to the red phosphor stripe, the chromaticity defect occurs in the picture tube assembly process. Occurs, and the assembly man-hours and parts cost up to that point are wasted. Therefore, in the conventional manufacturing process of a picture tube panel, the inner surface of the panel is inspected in order to inspect the degree of color mixture in the phosphor stripes of each color (how much other phosphors are mixed in a single color phosphor stripe). Were irradiated with ultraviolet rays through a color selection mask, and the spectrum of the phosphor stripes emitted by the ultraviolet rays was visually observed with a microscope, and evaluation such as pass / fail judgment was performed based on the spectrum.

[0003]

However, in the above-mentioned conventional example, since the visual ability of a skilled person who can discriminate a delicate degree of color mixing is relied on, even if the same operator has some variation in the inspection results. In addition, it is very difficult to adjust the level between workers, and it has not been possible to quantitatively inspect the degree of color mixing of the phosphor stripes of each color.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a picture tube capable of quantitatively inspecting the degree of color mixture of phosphor stripes formed on the inner surface of a panel. An object of the present invention is to provide a panel inspection device.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made to achieve the above object, and a picture tube panel in which red, green, and blue phosphor stripes are formed on the inner surface of a panel using a color selection mask. A light source for irradiating the inside of the picture tube panel mounted on the inspection stage with ultraviolet rays through a color selection mask, and moving the light source in a direction perpendicular to the stripe forming direction of the picture tube panel A light-source drive unit that supports the light-emitting device and a light-emitting probe that captures the emission spectrum component of the phosphor stripe emitted by ultraviolet irradiation from the light source, and measures the luminous intensity of each color by decomposing the captured emission spectrum component. The light source is moved through the light source driving unit while monitoring the light intensity data measured by the spectrophotometer and the An inspection control unit that detects the luminous intensity peak value of the emission spectrum for each stripe, and compares the detected luminous intensity peak value with the luminous intensity peak values of other phosphors. A configuration is adopted in which the degree of color mixing of other phosphors in the phosphor stripe is inspected each time.

[0006]

In the inspection apparatus for a picture tube panel according to the present invention,
Ultraviolet rays radiated from the light source are radiated to the inner surface of the panel through the color selection mask, and the spectral components of the phosphor stripes emitted by the radiated ultraviolet rays are taken into the spectrophotometer via the light receiving probe. In the spectrophotometer, the emission spectrum component is decomposed to measure the luminosity of each color, and this is supplied to the inspection control unit as luminosity data. The inspection control unit drives the light source driving unit while monitoring the luminous intensity data obtained by the spectrophotometer, and moves the light source by a fixed amount in a direction orthogonal to the stripe forming direction. Then, ma of the emission spectrum component of the inspection target color is obtained.
When the x value exceeds the peak, the light intensity peak value is detected, and the detected light intensity peak is compared with the light intensity peak values of other phosphors. Thus, the degree of color mixing of other phosphors in the phosphor stripe for each color is quantitatively inspected based on the comparison result in the inspection control unit.

[0007]

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

[0008] A panel support 7 made of, for example, resin is provided on the inspection stage 2. At the time of inspection, the picture tube panel 1 is placed on the inspection stage 2 by a panel transport device (not shown) via the panel support 7. And positioned.

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. 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 / closing operation, and a visible light unnecessary for the inspection from the light component emitted from the light source 3. A visible light cut filter 10 to be removed is provided.

The light source driving unit 4 movably supports the light source 3 in a direction X (in this embodiment, a long side direction of the panel) perpendicular 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 perpendicular to the stripe forming direction, and an electric motor that serves as a drive source for moving the light source 3 via the rectilinear slide guide mechanism And so on.

The spectrophotometer 5 takes in the emission spectrum component of the phosphor stripe of the picture tube panel 1 emitted by the irradiation of ultraviolet light from the light source 3 through the light receiving probe 11, and receives the light 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 this 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 converted into luminous intensity data of the spectrum for each color by the inspection control unit 6 Output to

The inspection control unit 6 includes, for example, the personal computer 1
CPU (Central Processing Unit) 1 built in the main body such as 2
2a and a light source controller 13 for controlling the operation of the light source drive unit 4. For example, a plotter-type printer 14 may be connected to the output terminal of the personal computer 12 as an additional hard copy function.

Next, an operation procedure of the panel inspection apparatus of the present embodiment will be described. In the present embodiment, of the three color phosphor stripes of red, green, and blue formed on the inner surface of the picture tube panel 1, for example, the color mixing degree in each of the phosphor stripes is determined 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 transport device (not shown), and in this state, the light source 3 is made to emit light at an arbitrary position, and the shutter 9 is opened to emit ultraviolet light emitted from the light source 3. The light is emitted through the visible light cut filter 10 to the inner surface of the panel. Thereby, 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.
Among the red, green, and blue fluorescent stripes R, G, and B formed on the inner surface of the panel, the fluorescent stripes reach, for example, red and green fluorescent stripes R and G, and emit light.

Next, the emission spectrum components Rs and Gs of red and green emitted in this way pass through the entire glass of the picture tube panel 1 and are taken into the light receiving probe 11, which passes through the optical transmission line 11a to the spectrophotometer 5. Is transmitted to In the spectrophotometer 5, red and green emission spectrum components Rs, Gs
And the luminous intensity of each color is measured, 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 and sets a predetermined spectral component out of the red and green luminescent spectral components Rs and Gs, in this embodiment, the green luminescent component. M of the spectral component Gs
The ax value, together with the position of the light source 3 at that time, is transmitted to the personal computer 12.
And the like. At this stage, since the ultraviolet rays UV emitted from the light source 3 are emitted only to the red and green phosphor stripes R and G via the color selection mask 8, the light intensity waveform obtained by the spectrophotometer 5 is As shown in FIG. 4, a waveform Gw of the green emission spectrum component Gs and a 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 operated by the control signal from U12a, and as shown in FIG. 5, the light source drive unit 4 is driven to move the light source 3 by a certain amount in the direction X orthogonal to the stripe forming direction. Each time, the shutter 9 is opened in the same manner as described above to emit a phosphor stripe by irradiating ultraviolet rays, and the position of the light source 3 at that time is determined by a personal computer together with the max value of the green emission spectrum component Gs to be first inspected. 12 and the like.

At this time, the CPU 12 of the inspection control unit 6
In a, the max value of the green light emission spectrum component Gs captured last time is the same as the light emission spectrum component G of the same color captured this time.
The max value of s is compared in order. 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 the light intensity peak value, and the light source drive unit 4 is driven to drive the light intensity peak value. 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 the luminous intensity peak value is obtained, as shown in FIG. 6, the ultraviolet light UV emitted from the light source 3 passes through the hole 8a of the color selection mask 8 and the green phosphor stripe G on the inner surface of the panel. Only in the state of irradiation. At this time, if the red phosphor r and the blue phosphor b are attached on the green phosphor stripe G, as shown in FIG. 6, the red mixed color component Gr is included in the green emission spectrum component Gs. And the blue color mixture component Gb. Therefore, in the luminous 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 luminous spectrum component Gs, the waveform of the luminous spectrum component Gr by the red phosphor r Rw and the waveform Bw of the emission spectrum component Gb by the blue b phosphor are detected, and are sent from the spectrophotometer 5 to the inspection control unit 6 as luminous intensity data.

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

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

After the degree of color mixture of the other phosphors in the green phosphor stripe G is inspected in this way, the degree of color mixture in the red phosphor stripe R is subsequently inspected by the same procedure as described above, and finally, the degree of blue color mixture is examined. The degree of color mixing in the phosphor stripe B is inspected, and a series of operations ends. In the above embodiment, the degree of color mixing in each color phosphor stripe is inspected in the order of green → red → blue. However, 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 stripe emitted by the irradiation of ultraviolet light from the light source are taken into a spectrophotometer via a light-receiving probe, and the spectrophotometer measures the luminosity of each color, and the inspection control unit measures the luminosity of the spectrophotometer. By moving the light source while monitoring the data, detecting the luminous peak value of the emission spectrum component of the color to be inspected, and comparing the detected luminous peak with the luminous peak values of other phosphors, as in the past, It is possible to quantitatively inspect the degree of color mixing of other phosphors in the phosphor strike without depending on the visual ability of a skilled worker.

As a result, it is possible to prevent the occurrence of a chromaticity defect in the picture tube assembling process due to the variation of the inspection result of the operator beforehand, and to statistically manage the transition of the color mixing degree with time. Therefore, the quality of the fluorescent screen of the picture tube panel can be guaranteed with high reliability.
In addition, since it is possible to numerically grasp changes in the degree of color mixing due to process improvement and differences in the degree of color mixing for each model as inspection data, it is useful for examination experiments to improve the chromaticity that affects the picture tube quality. Is also very useful.

[Brief description of the drawings]

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

FIG. 2 is a diagram (part 1) illustrating an ultraviolet irradiation state at the time of inspection.

FIG. 3 is a diagram (part 1) illustrating a phosphor light emitting state during inspection.

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

FIG. 5 is a diagram (part 2) showing an ultraviolet irradiation state at the time of inspection.

FIG. 6 is a diagram (part 2) illustrating a phosphor light emitting state at the time of inspection.

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

[Explanation of symbols]

 DESCRIPTION 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

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-61-77228 (JP, A) JP-A-2-79327 (JP, A) JP-A-58-201227 (JP, A) JP-A-1- 183031 (JP, A) JP-A-62-238427 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 9/42 H01J 9/227

Claims (1)

(57) [Claims] 1. A color selection mask is used on the inner surface of a panel to form a red
An inspection apparatus for a picture tube panel on which green and blue phosphor stripes are formed, and a light source for irradiating an inner surface of the picture tube panel mounted on an inspection stage with ultraviolet rays through the color selection mask. A light source driving unit that supports the light source so as to be movable in a direction perpendicular to the stripe forming direction of the picture tube panel; A spectrophotometer that measures the luminosity of each color by decomposing the luminescence spectrum component that has been captured, and moving the light source via the light source drive unit while monitoring luminosity data measured by the spectrophotometer Then, the luminous intensity peak value of the emission spectrum is detected for each phosphor stripe, and the detected luminous intensity peak value is detected. An inspection control unit that compares a peak value with a luminous intensity peak value of another phosphor. An inspection apparatus for a picture tube panel.