JPH09265965A - Manufacture of vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide the manufacture of a vessel, which can detect any detective product such as cutting and cracks or disconnection taking place in each lead-in wire and each lead-in metallic foil that are sealed in a collapse prevention part at the bulb end part, by new inspection means such as non-destructive and non-contact inspection with high accuracy during manufacturing processes. SOLUTION: Each lead-in metallic foil 3 is disposed therein, which connects lead-in wires 41 and 42 with the end part of a vessel 1. Next, the end part of the glass bulb 1 is heated by a burner, and a softened bulb end part is pressed by a pincher jaw so as to be formed into a collapsed sealing part 2. Subsequently, the temperature distribution of the sealing part 2 is measured while the collapsed sealing part 2 is still in a condition of high temperature, the portion of each lead-in wire 41 and 42 within the sealing part 2 is compared in a temperature distribution with each lead-in metallic foil 3 portion, and it is judged based on the degree of uniformity in a temperature distribution whether or not they are acceptable. Products that have been distinguished, are thereby properly fractionized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention uses quartz glass or hard glass for a bulb which constitutes a halogen bulb, a high pressure discharge lamp or the like, and uses an introducing metal foil in which an introducing wire is connected to an end of the glass bulb as an airtight introducing body. The present invention relates to a method for manufacturing a sealed tube.

[0002]

2. Description of the Related Art In high pressure discharge lamps such as halogen bulbs, high pressure mercury lamps, and metal halide lamps, quartz glass is used as a material for bulbs constituting an arc tube in consideration of heat resistance and corrosion resistance. And
Its manufacture is to supply electric power to the filament or electrode in the vicinity of the open end of the bulb and arrange an introduction metal foil connected to an introduction wire for supporting these, heat the bulb from the outside, and melt the glass. It is pressed by a suitable pincher jaw to form a sealed portion in which the valve and the introduced metal foil are hermetically sealed.

The introduction metal foil sealed in the sealing portion is generally very thin and is made of molybdenum foil, and has an inner introduction wire having one end protruding inside the valve and an outer introduction wire having one end protruding outside the valve. It is connected. (In some cases, the introduced metal foil is led out of the valve as it is to form the external introducer.) In addition, the introduced metal foil such as the molybdenum foil is crushed by the pincher jaws. In order to achieve sufficient strength with respect to, the thickness must be thick, and in order to hermetically seal the quartz glass bulb, it is necessary to make the thickness as thin as possible. In consideration of these factors, the thickness is usually about 20 to 30 μm. Sano is used.

Of the above, the external lead wire is also made of a metal such as molybdenum or tungsten, which is the same as the introduced metal foil in consideration of heat resistance and corrosion resistance. By resistance welding, the two are melt-bonded by utilizing local heating. Since the mutual material to be joined is a high melting point metal, it is difficult to melt, and if the melting is insufficient, the joining strength tends to be weak, and welding is performed between the joints via a brazing member such as tantalum foil, Increasing the bonding strength is being carried out. However, when the welding rod contact portion oxidizes or the welding current varies, the proper welding may not be performed and the joint strength may decrease. Then, the sealing operation of the glass bulb is carried out by disposing the introduction metal foil connected to the inner and outer introduction wires in the vicinity of the end portion inside the glass bulb, heating and melting the glass bulb, and pressing the fusion portion with the pincher jaws. , By crushing. However, at this time, the glass which is in a melted and softened state flows downward from the jaw. For this reason, forces in opposite directions act on the connection between the internal lead-in wire and the lead-in metal foil and the connection between the lead-in metal foil and the external lead-in wire, and tension is applied to the lead-in metal foil that has connecting portions at both ends. Causes the disconnection of the inner and outer lead wires, the disconnection of the joint portion, or the cut of the introduced metal foil. Also, since the pincher jaws that form the sealing part are pressed mechanically almost uniformly, if there is a difference in wall thickness between the bulbs or a temperature difference in the burner heating, the glass melting degree of each bulb will increase. It was not uniform, and the tension applied to the introduced metal foil at this time was strong and weak, and there was a high probability that problems such as cutting would occur in those to which excessive tension was applied.

Although molybdenum and tungsten have a high melting point, the temperature rises due to heating by an oxyhydrogen gas burner for melting the quartz glass during the sealing work,
Due to this temperature rise, it becomes brittle, and cracks may occur due to pressing by the pincher jaws during sealing.

In a halogen bulb, for example, when the glass bulb is sealed, the lead wire or the metal foil may be completely cut or disconnected due to the above reasons, and the filament may not be energized in the subsequent steps to turn on. What is found can be classified as defective. However, if the lead wire is cracked or is about to be cut and is in an unstable connection state, if the unstable part is disconnected during use due to stress such as expansion and contraction due to blinking, the disconnection part Arc discharge may occur in the slight gap of the. It is good when this arc discharge does not have any effect other than turning it off due to poor continuity due to poor continuity, but the heat and pressure of the arc discharge breaks the sealing part and scatters the glass pieces and damages the lighting fixture, In extreme cases, there is a risk of hitting people or equipment near the equipment and harming them, which may be a safety issue.

Therefore, the defective products such as the cutting of the above-mentioned lead-in wire or the introduced metal foil, cracks or disconnection are carried out by visual inspection, but it is difficult to see by visual inspection, it takes time, and the accuracy is poor. There was a flaw. In addition, a continuity test in which a predetermined current is passed between the internal and external introduction lines to analyze a measured current value with high accuracy, and an image is visually determined and inspected by X-rays have been used.

[0008]

However, in the continuity test, which is an alternative to the visual inspection, the bulb must be directly contacted with a terminal or the like to pass a current, and a load is applied to the bulb. Further, even if there is continuity during the continuity inspection, cracks may progress and become a defect. In addition, the inspection by the X-ray image has a problem that the scale of the inspection device is large, it is expensive to provide in the process of manufacturing the light bulb, and the manufacturing cost is increased.

In terms of capturing an image, it has been attempted to apply illumination light from the outside to capture the reflected light, but both the introduction line and the introduction metal foil to be inspected have a metallic surface. In addition, the glass on the surface of the encapsulation portion that covers the introduction line and the introduction metal foil refracts and reflects light, and it is difficult to accurately grasp the internal shape and situation.

Therefore, it is considered that inspection is usually best after a finished product is a finished product. However, the inventors of the present invention pay attention to the fact that a problematic point occurs during the sealing work, and take the idea of the finished product into consideration. We came up with the idea of performing it during the process of processing, not inspection, and the introduction wire and metal foil were not completely cut,
It has become possible to detect even unstable things such as cracks that will affect later.

According to the present invention, defective products such as cuts, cracks, and disconnections occurring in the introduction wire and the introduction metal foil, which are sealed in the crushed sealing portion at the end of the valve, are not destroyed or destroyed during the manufacturing process. It is an object of the present invention to provide a method of manufacturing a tube which can be detected with high accuracy by a novel means by contact.

[0012]

According to a first aspect of the present invention, there is provided a method of manufacturing a tube, comprising the steps of disposing an introducing metal foil having an introducing wire connected to an end of a tube glass bulb, and the glass. A step of heating the end of the valve with a burner, a step of pressing the softened valve end with a pincher jaw to form a crushed seal, and a step of molding the crushed seal while the crushed seal is in a high temperature state. Measuring the temperature distribution, comparing the temperature distribution of the introduction line portion and the introduction metal foil portion in the sealing portion, an inspection step of determining the quality from the uniformity of this temperature distribution, and a step of separating the determined products It is characterized by having.

While the sealing portion after crushing and molding the bulb is in a high temperature state (it does not have to be red-hot in particular), infrared rays from the introduced metal foil portion or the inner / outer lead wire portion are detected by the detector. The temperature distribution is detected and the temperature distribution is measured. If the temperature distribution in the same member is almost uniform, it is judged to be normal, but the part where the temperature changes suddenly (for example, if the wire breaks in the middle of the lead-in wire) , The temperature of that part has dropped and a dark spot or the like has occurred.) When it is determined that there is an abnormality, the valve can be classified as a rejected product by the signal from the signal processing unit.

In the method of manufacturing a tube according to claim 2 of the present invention, in the inspection step, infrared rays from the sealing portion are input to a non-contact type detector, amplified by an amplifier, and the amplified signal is processed. The feature is that the quality is judged by doing.

Infrared rays are detected and measured by using a thermal element such as a non-contact type thermistor or a bolometer or a photoelectric conversion element such as InSb or GeAu. Whether the quality is good or bad can be determined, and the same operation as described in claim 1 is achieved.

According to a third aspect of the present invention, there is provided a method for manufacturing a tube, wherein a step of disposing an introducing metal foil having an introducing wire connected to an end of the tube glass bulb, and a burner at the end of the glass bulb. In the step of heating with, a step of pressing the softened valve end portion with a pincher jaw to form a crushed sealing portion, while the introduction metal foil portion and the introduction wire portion in the crushed sealing portion are in a high temperature state, The present invention is characterized by including an inspection step of taking and processing the metal foil portion and the lead-in line portion as an image for identification, detecting an abnormal portion to determine pass / fail, and a step of separating the determined products. .

While the introduced metal foil portion and the introduced wire portion are in the red hot state, the brightness of the red hot state is measured and replaced with the temperature to judge the situation, and the difference in light and dark in the red hot state has a temperature difference. It can be determined that there is an abnormal location such as cutting or cracking, and defective products can be identified.

According to a fourth aspect of the present invention, there is provided a method for producing a bulb, comprising a step of disposing an introduction metal foil having an introduction wire connected to an end of the bulb glass bulb, and a burner at the end of the glass bulb. In the step of heating with, a step of pressing the softened valve end portion with a pincher jaw to form a crushed sealing portion, while the introduction metal foil portion and the introduction wire portion in the crushed sealing portion are in a high temperature state, The metal foil portion and the lead-in wire portion are taken as an image by an image input device, the image information is input and stored in an image processing device for measurement and inspection, and the inspection information is fed back to the glass bulb and an image display device is provided. It is characterized in that it has an inspection step for displaying and a step for separating good and defective products determined from the inspection result.

While the sealing portion after crushing and molding the valve is in a high temperature state where it is red-hot, infrared rays from the metal foil portion for introduction and the inner and outer introduction wire portions are input to the image input device, and this image information is displayed as an image. The temperature distribution is stored in the processor and the temperature distribution is measured from the difference in brightness. If the temperature distribution in the same member is almost uniform, it is judged to be abnormal, but the part where the temperature changes suddenly (for example, in the middle of the lead-in line) If it is broken, the temperature of that part has dropped and dark spots etc. are generated.) If it is determined that there is an abnormality, the signal from the processor is used to classify the valve as a rejected product and the image. The fact is displayed on the display device.

The image input device may be either a two-dimensionally arranged sensor having a light receiving function or a one-dimensionally arranged light receiving sensor for scanning.
In addition, this sensor can sense the difference between heat and brightness, so it is preferable that it has sensitivity from the visible region to the infrared region.

The method of manufacturing a tube according to a fifth aspect of the present invention is characterized in that an image is input by a CCD camera.

The two-dimensional CCD camera can capture a predetermined inspection range finely and clearly and can store an accurate image.

The method of manufacturing a tube according to claim 6 of the present invention is characterized in that an image is input by an infrared sensor.

The same operation as described in claim 2 and claim 5 is achieved.

The method of manufacturing a tube according to claim 7 of the present invention is characterized in that a coiled filament or a discharge electrode is provided in the glass bulb.

A bulb is a light bulb that causes a coil-shaped filament to emit light, or a discharge lamp that causes a discharge between the discharge electrodes to emit light.

[0027]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is an explanatory diagram showing the outline of the inspection immediately after the crushing work when sealing a bulb, for example, a halogen bulb L of one-end sealed type, and FIG. 2 shows a molybdenum foil in the sealed portion and an internal lead wire and an external lead wire. FIG. 3 is an enlarged front view of the display device showing the welded and connected portion, and FIG. 3 is a further enlarged view of the display device showing the connected portion of the molybdenum foil, the tantalum foil, and the internal lead-in wire in the sealing portion.

In the figure, 1 is a cylindrical straight tubular valve made of quartz glass, 2 is a sealing portion formed by crushing one end of the valve 1, and 3 and 3 are molybdenum sealed in the sealing portion 2. Introducing metal foils made of foil, 41, 41 and 42, 42 are internal introducing wires and external introducing wires made of molybdenum or tungsten wires which are connected to the molybdenum foil 3 by resistance welding through the brazing member 5 such as tantalum Ta foil. Is. Further, 6 is a filament formed by coiling a tungsten wire arranged substantially along the central axis of the bulb 1 and is connected between the internal lead wires 41, 41.
Reference numeral 7 denotes an exhaust pipe provided on the top of the valve 1 opposite to the sealing portion 2.

The halogen bulb L is manufactured as follows. Generally, the sealing operation is performed in a state where the bulb 1 is vertical. First, the filament 6 side is inserted first from the opening on the one end side of the bulb 1 and then the molybdenum foils 3, 3 are inserted.
The portion is located near the inside of the opening. Next, the molybdenum foils 3 and 3 are softened by externally heating the periphery of one end of the valve 1 with an oxyhydrogen burner,
The softened and inwardly shrunk glass of the bulb 1 adheres around the molybdenum foils 3, 3. Further, when the end portion of the bulb 1 is heated to melt the glass, the heating is stopped, and the end portion is pressed from two sides by, for example, a split pincher jaw in which a recess having a predetermined sealing portion shape is formed. The end of the valve 1 is crushed by the pressing of the pincher jaws, and the crushed sealing portion 2 having a predetermined shape is formed by releasing the pressing of the jaws.

When crushed by the pincher jaws, the glass of the bulb 1 which is in a melted and softened state flows outward from the jaws. For this reason, forces in opposite directions act on the connection between the internal lead-in wire 41 and the molybdenum foil 3 and the connection between the molybdenum foil 3 and the external lead-in wire 42, and the molybdenum foil 3 having the connection at both ends is applied. Since tension works, the inner and outer lead wires 41 and 42 are likely to be cut, the welded portion is disconnected, or the molybdenum foil 3 is cut.

Immediately after this, the molybdenum foils 3 and 3 located inside the surface of the crushing and sealing portion 2 are at a temperature higher than that of the surface.
Also, the temperature distribution of the inner / outer lead-in wires 41, 42 connected to both ends of the foils 3, 3 via the brazing member 5 of tantalum foil is measured. Then, the temperatures of these measured parts are analyzed to determine whether or not the conduction to the filament 6 which is the light emitting member of the sealed light bulb L is good, and the light bulb L is discriminated.

Immediately after forming the crushed sealing portion 2 described above, the molybdenum foils 3, 3 inside the sealing portion 2, the brazing member 5, and the portions near the connecting portions of the inner / outer introduction wires 41, 42 are still in a red heat state. , The brightness of this red heat state is measured and replaced with the temperature to judge the situation. In addition, the brightness is not uniform even in the red hot state, and there is a degree of difference depending on the thermal conductivity of each member and the volume related to the width and thickness. In this case, the brightest part is the tantalum foil 5, then the inner lead-in wire 41 and the outer lead-in wire 42.
The portion (of course, the introduction lines 41 and 42 are in the vicinity of the connection portion with the molybdenum foil 3), and then the molybdenum foil 3 portion.

The molybdenum foil 3 of the light bulb L and the internal / external lead-in wires 41, 42 connected to the foil 3 are measured for brightness (red heat degree) to measure continuity, and the outline thereof is shown in FIG. Done by In FIG. 1, 81 is a CCD camera, 82 is an image processing device connected to the CCD camera, 83 is an image display device, 84 is an inspection start signal input to the image processing device 82, and 85 is an output signal from the image processing device 82. Is.

This inspection is taken by the CCD camera 81 of the inspection device shown in FIG. 1 while the molybdenum foil 3 and the inner / outer lead-in wires 41, 42 connected to the foil 3 are in a red heat state. The captured image is stored in the image processing device 82 within the range shown in FIG. This stored signal first issues an inspection start signal 84 from the machine side in conjunction with the timing at which the machine holding the valve 1 moves.
The signal 84 is received by the image processing device 82 and the processing is started. Then, the image taken by the CCD camera 81 and the determination result are displayed on the image processing device 82, and are output to the machine side that holds the valve 1 as a defective signal, and a procedure for discharging from this process is adopted. To be At this time, the background is affected by ambient light, so it should be dark.

Here, the measurement performed in the image processing device 82,
The determination process will be described in more detail. An inspection start signal 84 is input to the image processing device 82 and the CCD
An image is also input from the camera 81. The condition of each bulb 1 to be sealed is slightly different each time, and the brightness in a red-hot state is not stable. Therefore, wait until the tantalum foil 5 portion, the molybdenum foil 3 portion, and the inner / outer lead-in lines 41, 42 have settled down to the brightness that can be identified, and re-input the image. Then, when an image having an appropriate brightness is obtained, the image is stored in the image processing device 82, and, for example, of the images, first, the left half and then the right half are measured in this order.

First, looking at the left half, it is separated from the background, and is laterally scanned downward from above to the internal lead-in wire 41, tantalum foil 5, molybdenum foil 3, tantalum foil 5, and external lead-in wire 42. The widths in the direction 4W, 5W, 3W, ... Are measured. The width of each member is standardized, and the width on the image can be calculated by taking the photographing magnification into consideration.
Only, tantalum foil 5 only, molybdenum foil 3 only,
... can be identified.

Then, while scanning only the portion of the internal lead-in line 41, it is measured whether the brightness indicating the lead-in line 41 is continuous in the vertical direction of the screen. In the tantalum foil 5 portion, the tantalum foil 5 and the internal lead-in line 41 are separated by the difference in brightness, and whether or not the internal lead-in line 41 is continuous in the vertical direction of the screen is scanned and measured. In addition, in the molybdenum foil 3 part, the ends of the tantalum foil 5 are obtained from both sides based on the difference in brightness, and then the internal lead-in wire 41 part is formed.
Measure separately. Then, the same measurement is performed on the left half.

The signal obtained by the above-mentioned measurement by scanning from above is processed by the image processing device 82 and sent to the image display device 83. This image display only needs to have a continuous and uniform brightness for each member, and if there is a local brightness change (dark) in the middle, this part Indicates that there is a defective part that is not continuous and is cut off, or that there are cracks and it is about to cut. This display is, for example, as shown in FIG. 3, the same pattern (color of temperature) as the surface of the tantalum foil 5 is displayed in the middle of the internal lead-in wire 41, and the internal lead-in wire 41 does not exist in this portion. It can be seen that (x) is generated. Then, the inspection device is displayed on the display device 83, and the accepted product is sent to the exhaust device of the next process, and the valve 1 is passed through the exhaust pipe 7.
After exhausting the inside and filling halogen and argon gas, the exhaust pipe 7 is closed. Further, the light bulb L determined to be unacceptable is taken out from the sealing device and discarded in a separate defective product box or the like. Moreover, when the length of the internal lead-in wire 41 or the external lead-in wire 42 from the end of the molybdenum foil 3 on the molybdenum foil 3 is short, for example, about 0.7 mm, in other words, the molybdenum foil 3 and the lead-in wires 41 and 42 are superposed. If the weld area is small and the welded area is small, the joint strength is weakened, and the connection between the two may occur although it is not a disconnection. However, if the measurement in the vertical direction is performed as described above, it is possible to detect an object that may cause such a problem.

According to the present invention, the red heat of the molybdenum foil 3, the tantalum foil 5 and the inner / outer lead-in wires 41, 42 buried in the sealing portion 2 is maintained while the sealing portion 2 is in the high temperature state. By reading the state as a temperature distribution, it is possible to detect areas where the temperature has changed locally such as cuts and cracks that cause continuous breaks and dark spots. The quality can be determined with high accuracy by measuring.

FIG. 4 is an explanatory view showing another embodiment of the present invention. The same parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In the figure, 91 is a scanning unit, 92 is an optical system, 93 is a detecting unit, 94 is an amplifier, 95 is a signal processing unit,
96 is a display device, and 97 is a signal output to the machine side.

In this case as well, the sealing portion 2 after the valve 1 is crush-molded is in a high temperature state (it does not have to be red-hot in particular).
Then, the scanning unit 91 is operated to guide the infrared rays from the sealing unit 2 to the detector 93 via the optical system 92. In this detector 93, an electric signal is generated according to the intensity of infrared rays, and the signal amplified by the amplifier 94 is processed by the signal processing unit 95, and the molybdenum foil 3 part, the tantalum foil 5 part, the inner / outer lead-in wire are processed. The temperatures of the 41 and 42 parts are measured, and if the temperature distribution in the same member is almost uniform, it is determined that there is no abnormality.
When it is determined that there is a portion where the temperature changes abruptly (for example, when there is a break in the middle portion of the lead-in wire 41, the temperature of that portion has dropped and dark spots have occurred), it is determined that a signal is generated. A signal is output from the processing unit 95 to the sealing device side, and the valve 1 is a rejected product, and the process of discharging it from the process is taken. In addition, the accepted product is sent to the exhaust device of the next process. On the other hand, a signal from the signal processing unit 95 is imaged as a thermograph on the display device 96, but the display device 96 is not essential.

As the detector 93, a thermal element such as a non-contact type thermistor or bolometer, or I
A photoelectric conversion element such as nSb or GeAu can be used.

The present invention is not limited to the above embodiment. For example, the bulb to be applied is not limited to a halogen bulb, but may be other types of bulbs, or may be a discharge lamp having discharge electrodes facing each other as a light source, not limited to a bulb. Further, the crushing sealing portion is not limited to the one provided at one end of the bulb, and may be a bulb having both ends sealed. In short, the glass bulb is sealed at its end portion with quartz glass or hard glass. It can be applied to the case where a metal foil is used as the introduction conductor. Further, the number of the introduced metal foils sealed in one crushable sealing portion may be one, and it is also applicable to the case where the metal foils are extended and also used as the internal or external introduction lines.
Further, the brazing member interposed between the introduction metal foil and the introduction wire during welding may be omitted.

[0044]

According to the invention described in claims 1 to 6, the temperature distribution of the introduction member such as the introduction metal foil or the introduction wire embedded inside the sealing member is high while the sealing portion is in a high temperature state. Detecting the part where the temperature has changed by cutting or cracking in the member to see if the continuity is broken, the tube is measured in a non-destructive and non-contact manner during the processing process regardless of the visual sense. Therefore, the quality can be determined with high accuracy. Also,
By measuring the length of the connection part with the introduced metal foil or the part introduction line, it is possible to separate those with weak connection strength.

In the tube that has undergone this inspection step, it is possible to separate and exclude those that are cracked and are unstablely connected, rather than those that are completely disconnected from the light emitting source. The safety when using a tube can be improved.

Further, claim 2, claim 5 and claim 6
According to the invention described in (1), the temperature detector (sensor) can be provided as a general-purpose product that is reliable, easily available, and inexpensive.

According to the invention described in claim 7, as described above, it is possible to provide a high-quality electric bulb or discharge lamp which is of high quality and is free from bulb breakage.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a general outline of an inspection immediately after a crushing operation when sealing a tube of the present invention.

FIG. 2 is an enlarged front view of the display device showing a portion where the molybdenum foil in the sealed portion of the tube is connected by welding to the internal lead-in wire and the external lead-in wire.

FIG. 3 is an enlarged front view of the display device showing a portion where a molybdenum foil, a tantalum foil, and an internal lead-in wire are connected to each other in the sealing portion.

FIG. 4 is an explanatory diagram for explaining another embodiment of the inspection process of the present invention.

[Explanation of symbols]

 L: Tube (light bulb) 1: Bulb 2: Sealing part 3: Introduction metal foil (molybdenum foil) 41: Internal introduction line 42: External introduction line 6: Luminescent source (filament, discharge electrode) 81: CCD camera 82: Image processing device 83: Image display device 84: Inspection start signal x: Disconnection location 91: Scanning part 92: Optical system 93: Detection part 94: Amplifier 95: Signal processing part 96: Display device 97: Signal output

Claims (7)

[Claims] 1. A step of disposing an introducing metal foil having an introducing wire connected to an end portion of a tube glass bulb; a step of heating the end portion of the glass bulb with a burner; a softened valve end portion being a pincher jaw. A step of forming a crushed and sealed portion by pressing with; a temperature distribution of the sealed portion is measured while the crushed and sealed portion is in a high temperature state, and the introduction line portion and the introduction metal foil portion of the inside of the sealed portion are measured. A method of manufacturing a tube, comprising: an inspection step of comparing temperature distributions and determining whether the temperature distribution is good or bad; and a step of separating the determined good and defective products. 2. The inspection process according to claim 1, wherein infrared rays from the sealing portion are input to a non-contact type detector, amplified by an amplifier, and subjected to signal processing to determine pass / fail. Tube manufacturing method. 3. A step of disposing an introducing metal foil having an introducing wire connected to an end portion of a tube glass bulb; a step of heating the end portion of the glass bulb with a burner; a softened valve end portion being a pincher jaw. A step of pressing by pressing to form the crushed seal portion; while the introduced metal foil portion and the introduced wire portion in the crushed seal portion are in a high temperature state, the metal foil portion and the introduced wire portion are captured as an image and processed. And an inspection step of identifying abnormalities and determining whether they are good or bad;
And a step of separating defective products. 4. A step of disposing an introducing metal foil having an introducing wire connected to an end portion of a tube glass bulb; a step of heating the end portion of the glass bulb with a burner; a softened valve end portion being a pincher jaw. A step of pressing by pressing to form the crushed seal portion; while the introduced metal foil portion and the introduced wire portion in the crushed seal portion are in a high temperature state, the metal foil portion and the introduced wire portion are imaged by an image input device. An inspection process in which the image information is input, stored in the image processing device, measured and inspected, and the inspection information is fed back to the glass bulb and displayed on the image display device; And a step of separating defective products. 5. The tube manufacturing method according to claim 3, wherein the image input is performed by a CCD camera. 6. The method for producing a tube according to claim 3, wherein the image input is performed by an infrared sensor. 7. The method for producing a tube according to claim 1, wherein a coil-shaped filament or a discharge electrode is provided inside the glass bulb.