TWI597450B - Xenon flash - Google Patents

Description

Xenon flash

This invention relates to xenon flash lamps.

A xenon lamp is a high-intensity discharge lamp that uses a lamp that emits light by discharge in helium. Among them, a xenon flash lamp is utilized as a light source of a light pulse.

[Prior Art Document] (Patent Document) Patent Document 1: 2005-19131 "Lighting Discharge Lamp, Flashing Discharge Lamp Lighting Device and Light Irradiation Device" (Publication Date: 2005/01/20) Applicant: Harley Sheng Toshiba Lighting Co., Ltd. Patent Document 2: Japan Special Open 2005-56638 "Flash" (Public Date: 2005/03/03) Applicant: Iwasaki Electric Co., Ltd.

[Problem to be Solved by the Invention] Fig. 1 is a view showing a typical luminous distribution of a xenon lamp. The xenon lamp has characteristics of a continuous spectrum in a range from an ultraviolet region (UV light region) to an infrared region (IR light region), and has a light emission distribution very similar to sunlight.

The inventors of the present invention have raised the luminous efficiency in a specific wavelength region with respect to such a xenon flash lamp, and have been focused on improving the luminous efficiency of the UV light region.

Accordingly, it is an object of the present invention to provide a xenon flash lamp that enhances the luminous efficiency of a UV light region.

Further, the object of the present invention is to provide a xenon flash lamp for a xenon flash lamp which improves the luminous efficiency of a UV light region, and the structure thereof enables the lamp to have good startability and does not occur on the wall of the lamp at the initial stage of lamp lighting. Whitening phenomenon or blackening phenomenon. [Means for solving problems]

In one embodiment, the xenon flash lamp of the present invention is a xenon flash lamp having a double tube structure composed of a light-emitting portion of a large-diameter tube body and an electrode arrangement portion of a small-diameter tube body at both ends thereof, at least a tip end portion of the cathode electrode and the aforementioned The front end of the small-diameter tube body is aligned in the axial direction of the tube.

In the above-described xenon flash lamp, a trigger band may be further disposed on the outer circumference of the small-diameter portion pipe body surrounding the tip end portion of the cathode electrode.

In the above-described xenon flash lamp, the tip end portion of the anode electrode and the tip end of the small-diameter portion pipe may be aligned in the axial direction of the tube.

In the above-described xenon flash lamp, the electrode arrangement portion may be a contraction structure in which an electrode and a small-diameter tube body are heated and welded. [Effect of the invention]

According to the present invention, it is possible to provide a xenon flash lamp in which the luminous efficiency of the UV light region is improved.

Further, with the present invention, a xenon flash lamp can be provided for the xenon flash lamp which has improved the luminous efficiency of the UV light region, and the structure thereof can make the lamp tube have good startability and will not be on the wall of the lamp tube at the initial stage of lamp lighting. Whitening or blackening occurs.

Hereinafter, an embodiment of the xenon flash lamp of the present invention will be described with reference to the accompanying drawings. In the drawings, the same components are denoted by the same reference numerals, and the repeated description is omitted. Further, the embodiments are intended to be illustrative of the present invention and are not intended to limit the technical scope of the present invention.

Fig. 2 is a view for explaining a conventional xenon flash lamp 100. The conventional lamp tube 100 is a straight tube type lamp, and the tube inner diameter of the electrode arrangement portions 20 and 40 at both ends and the central light-emitting portion 30 are cylindrical shapes having the same tube inner diameter. The cathode electrode 50 is formed in one electrode arrangement portion 20, and the anode electrode 60 is formed in the other electrode arrangement portion 40. For the activation of the lamp tube, a plurality of annular trigger wires 80-2 are wound around the outer peripheral portion of the pipe body, and the annular trigger wires are connected to each other by the trigger wire 80-1.

The electrode arrangement portion 20 for occluding the cathode electrode 50 and the electrode arrangement portion 40 for accommodating the anode electrode 60 may be separately heated and sealed to form an adhesion structure. Such a close-knit structure is called a shrink structure.

The lighting condition is to charge the capacitor with an applied voltage of 3.3 kV and apply this charging voltage between the anode and the cathode of the lamp.

The size specifications of the conventional lamp tube 100 are as follows. Distance between electrodes (lighting length): L = 550 to 850 mm Inner diameter of the light-emitting tube: ID = 8 mm, wall thickness: 1 mm Electrode diameter: 6.4 mm or 7.5 mm The inventors originally developed a helium gas that can "strongly emit light". The flash is used as a target, and the specifications of various lamps are changed for research and development. In this process, compared with the conventional lamp shown in Fig. 2, an attempt is made to make a lamp tube, increase the inner diameter of the lamp tube, and reduce the resistance 电极 between the electrodes at the time of lighting, and flow more current. .

As a result of measuring the light emission spectrum of the bulb having an increased inner diameter of the bulb, it was confirmed that strong light emission was obtained in the UV light region as compared with the conventional lamp. A powerful xenon flash lamp is obtained in the UV light region, which is the most suitable tube for sterilization treatment.

With respect to the conventional lamp tube 100 shown in Fig. 2, a bulb which increases the inner diameter ID of the arc tube is produced, and the amount of light and current in the UV light region of the bulb at the time of lighting are measured. Table 1 is experimental data showing the relationship between the inner diameter ID of the arc tube of the tube and the amount of ultraviolet light which increase the inner diameter ID of the arc tube. The amount of ultraviolet light is an amount of light having a wavelength of 254 nm in the UV light region which is effective for sterilization purposes, for example. Further, a change in current with respect to the inner diameter ID of the light-emitting portion is also displayed. Figure 3 is a graph showing the amount of light and peak current of Table 1 with respect to the inner diameter of the arc tube.

[Table 1] Table 1: Relationship between the amount of light (wavelength 254 nm) and current with respect to the inner diameter of the arc tube

As shown in Fig. 3, as the inventors expected, as the inner diameter ID of the arc tube increases by 6 to 20 mm, the peak current (indicated by □ in the figure) increases approximately proportionally. At this time, the amount of light in the UV light region (indicated by ■ in the figure) is also greatly increased. Therefore, when the amount of light (wavelength 254 nm) is to be increased, it is judged that the inner diameter of the arc tube of the conventional lamp tube is further increased by 8 mm.

The electrode diameter of the conventional lamp tube 100 shown in Fig. 2 is two types of 7.5 mm and 6.4 mm. Here, in the case where the inner diameter of the arc tube is increased, the conventional lamp tube 100 shown in Fig. 2 is also considered to have the same tube inner diameter as the discharge portion and the electrode arrangement portion. However, when the same tube inner diameter is set, problems as described below occur. (1) If the inner diameter of the tube in the electrode arrangement portion of the arc tube becomes large, the interval between the trigger band for the auxiliary activation and the trigger line and the electrode end piece becomes large, and a sufficient trigger effect cannot be obtained, resulting in deterioration of the startability of the lamp. . (2) When the inner diameter of the tube in the electrode arrangement portion of the arc tube is increased, the gap between the electrode and the inner circumferential surface of the tube is increased, and when it is a contraction structure, the close operation takes time. Further, the accuracy of the seal itself is also deteriorated, the yield of the product is also deteriorated, and the letterability is lowered. (3) In consideration of the case where the inner diameter of the tube of the electrode arrangement portion of the arc tube is increased, it is also considered to adopt a suitable new large-diameter electrode. However, large-diameter electrodes lead to increased costs, and the lamp production plant does not want to increase the number of parts.

Therefore, the inventors of the present invention have developed a double tube structure lamp comprising a light-emitting portion of a large-diameter tube body and an electrode arrangement portion of a small-diameter portion tube body. That is, the electrode arrangement portion has the same configuration as the conventional lamp tube 100.

Fig. 4 is a view for explaining the xenon flash lamp 10 of the embodiment. The bulb 10 is formed by joining the light-emitting portions 3 having a relatively large inner diameter of the tube and the electrode arrangement portions 2 and 4 having a relatively small inner diameter of the tube, and the electrode arrangement portions 2 and 4 are located at both ends of the light-emitting portion and surround the electrode portion. . The cathode electrode 5 is disposed on one of the electrode arrangement portions, and the anode electrode 6 is disposed on the other side. The electrode arrangement portion may be a contracted structure or a non-contracted structure. In order to assist in starting the lamp tube, a plurality of annular trigger wires 8-3 are wound around the outer circumference of the electrode arrangement portions 2, 4, and the annular trigger wire 8-2 is wound around the outer circumference of the light-emitting portion 3, These circular trigger lines are connected to each other by a trigger line 8-1. The lighting condition of the lamp tube 10 is the same as that of the conventional lamp tube 100.

The dimensions of the bulb 10 of the present embodiment are as follows. Distance between electrodes (lighting length): L=550mm Large diameter part of the arc tube IDa=16mm, small diameter part IDb=10mm, wall thickness: 1mm Electrode diameter: 6.4mm or 7.5mm Enclosed gas: Helium 58.2Pa (equivalent to 437 torr)

A plurality of Xenon flash lamps 10 of the double tube structure shown in Fig. 4 were produced and the results of experiments were carried out, and it was judged that a number of lamps had a failure to start. Further, it is judged that the inner wall of the arc tube of the plurality of lamps is blackened or whitened.

As a result of analyzing the cause, the inventors have determined that the position of the tip end portion of the electrode at the tip end of the small-diameter portion pipe body (that is, the boundary portion between the small-diameter portion pipe body and the large-diameter portion pipe body) may occur. Blackening or whitening. Further, the blackening phenomenon or whitening phenomenon of the inner wall of the arc tube occurs more frequently in the vicinity of the cathode electrode than in the vicinity of the anode electrode.

Therefore, the inventors produced the following lamp tube and investigated the occurrence of the blackening phenomenon or the whitening phenomenon of the inner wall of the arc tube, which changes the cathode electrode with respect to the boundary portion between the small diameter tube body and the large diameter portion tube body. The position of the front end.

Fig. 5A is a view for explaining a bulb having a structure in which a tip end portion of a small-diameter portion of a xenon flash lamp with respect to a double tube structure is located in a small-diameter portion tube body. Fig. 5B is a view for explaining a bulb having a structure in which the tip end portion of the cathode electrode is aligned with respect to the tip end of the small-diameter portion of the xenon flash lamp of the double tube structure. Fig. 5C is a view for explaining a bulb having a structure in which a tip end portion of a small-diameter portion of a xenon flash lamp with respect to a double tube structure is located in a large-diameter tube body. Table 2 shows the results of the startability of the lamps of Figs. 5A to 5B and the appearance of the inner wall of the arc tube.

[Table 2] Table 2: Results of the startability of the lamp and the appearance of the inner wall of the arc tube

Here, the startability evaluation was performed by separately making each of the lamps. The test conditions were carried out by applying a capacitor charging voltage of 2.5 kV to the lamp tube, and repeating the lighting for 1,000 times to perform evaluation.

The appearance of the inner wall of the arc tube was evaluated by making two tubes for each test. The test conditions were carried out by applying a capacitor charging voltage of 3.6 kV to the lamp tube (the capacity of the capacitor used was 600 μF), and lighting was performed at a frequency of 30 seconds, and 10,000 times of off (lighting and turning off) was performed. To evaluate.

As shown in Fig. 5A, the axis of the tube as seen in the figure is positive in the right direction, and the tube at the front end of the cathode electrode is Sa=-5 mm, which is unactuable in the direction of the front end of the small-diameter tube. Light tube. Further, there is a bulb in which the whitening phenomenon 12 occurs on the inner wall of the arc tube near the cathode electrode. The reason for this is that when the cathode electrode 5 is located in the small-diameter tube body, since the arc generated from the electrode contacts the quartz tube body, the tube body is whitened due to the heat of the arc.

As shown in Fig. 5B, in the lamp tube of Sb = 0 mm in which the tip end of the small-diameter portion pipe body and the tip end of the cathode electrode are aligned, there is no failure in starting. Further, the inner wall of the arc tube near the cathode electrode does not change, but is in a clean state.

As shown in Fig. 5C, in the tube having the position of the tip end of the cathode electrode of Sc = +5 mm as a reference with respect to the tip end of the small-diameter portion, there is a case where the lamp cannot be activated. Further, there is a bulb in which the blackening phenomenon 14 occurs on the inner wall of the arc tube near the cathode electrode. The cathode electrode 5 is formed of a cathode electrode main portion 5a made of tungsten and a cathode electrode end piece portion 5b. The cathode electrode end piece portion 5b is joined to the front end of the main body portion and impregnated with an emission source for electron emission. The cathode electrode end piece portion 5b is composed of a compound of tungsten and ruthenium oxide. In the case where the tip end portion of the cathode electrode is located in the large-diameter tube body, arcing does not occur from the cathode electrode end piece portion 5b but from the cathode electrode body portion 5a, which causes the tungsten in the body portion to largely scatter and become blackened. The cause of phenomenon 14.

From the above results, it was judged that the lamp tube structure in which the tip end of the small-diameter portion pipe body and the tip end of the cathode electrode were aligned was the best in terms of the startability and the appearance of the inner wall of the arc tube.

Regarding the anode electrode, the startability of the lamp in which the tip end of the small-diameter portion pipe body and the tip end of the cathode electrode were aligned and the appearance of the inner wall of the arc tube were evaluated. As a result, there was no problem in the startability and the appearance of the inner wall of the arc tube.

(Advantages and Effects of the Present Embodiment) (1) Since the electrode arrangement portion is formed as a small-diameter tube body, the interval between the electrode tip end and the trigger band can be maintained in a close contact state, and a sufficient triggering effect can be obtained, and a good triggering effect can be obtained. Start-up. (2) In particular, with respect to the cathode electrode, the trigger band can be disposed in the vicinity of the cathode electrode end piece portion 5b, so that arcing can always occur from the cathode electrode end piece portion 5b. That is, it is possible to prevent arcing from occurring in the cathode electrode body portion 5a. Therefore, there is no case where an arc occurs from the cathode electrode main body portion 5a, and tungsten is scattered to cause a blackening phenomenon. (3) By making the electrode arrangement portion into a contraction structure, it is possible to suppress an increase in the electrode temperature. Therefore, it is possible to suppress the blackening phenomenon due to the scattering of the electrode material.

[Conclusion] Although the xenon flash lamp of this embodiment of the present invention has been described above, the present invention is not limited thereto. Those skilled in the art can easily add, delete, and change the present embodiment, and such improvements are also within the scope of the present invention. The scope of the present technology is determined by the description of the scope of the patent application.

2‧‧‧Electrode Configuration Department
3‧‧‧Lighting Department
4‧‧‧Electrode Configuration Department
5‧‧‧Cathode electrode
5a‧‧‧Cathode electrode body
5b‧‧‧Cathode electrode end piece
6‧‧‧Anode electrode
8-1‧‧‧ trigger line
8-2‧‧‧ Triggering line for large diameter pipe
8-3‧‧‧Trigger belt for small diameter pipe
10‧‧‧Xenon flashlights and tubes
12‧‧‧Whitening
14‧‧‧Blackening
20‧‧‧Electrode Configuration Department
30‧‧‧Lighting Department
40‧‧‧Electrode Configuration Department
50‧‧‧Cathode electrode
60‧‧‧Anode electrode
80-1‧‧‧ trigger line
80-2,80-3‧‧‧Ring trigger line
100‧‧‧ 知灯灯
ID‧‧‧Inner diameter of the tube, inner diameter of the light-emitting part, inner diameter
L‧‧‧light length

Figure 1 is a diagram showing a typical luminous distribution of a xenon lamp. Fig. 2 is a view for explaining a conventional xenon flash lamp. Fig. 3 is a graph showing the characteristics of the amount of light (wavelength 254 nm) and current with respect to the inner diameter of the arc tube shown in Table 1. Fig. 4 is a view for explaining a xenon flash lamp of the double pipe structure of the embodiment. Fig. 5A is a view for explaining a bulb having a structure in which a tip end portion of a small-diameter portion of a xenon flash lamp with respect to a double tube structure is located in a small-diameter portion tube body. Fig. 5B is a view for explaining a bulb having a structure in which the tip end portion of the cathode electrode is aligned with respect to the tip end of the small-diameter portion of the xenon flash lamp of the double tube structure. Fig. 5C is a view for explaining a bulb having a structure in which a tip end portion of a small-diameter portion of a xenon flash lamp with respect to a double tube structure is located in a large-diameter tube body.

Domestic deposit information (please note according to the order of the depository, date, number)

Foreign deposit information (please note in the order of country, organization, date, number)

(Please change the page separately) No

2‧‧‧Electrode Configuration Department

3‧‧‧Lighting Department

5‧‧‧Cathode electrode

5a‧‧‧Cathode electrode body

5b‧‧‧Cathode electrode end piece

8-1‧‧‧ trigger line

8-3‧‧‧Trigger belt for small diameter pipe

12‧‧‧Whitening

Claims (4)

A xenon flash lamp in which a cathode electrode is composed of a main body portion and an end piece portion in a xenon flash lamp having a double tube structure composed of a light-emitting portion of a large-diameter tube body and an electrode arrangement portion of a small-diameter tube body at both ends thereof. An end piece portion is formed at a front end of the main body portion, and one of the small diameter pipe bodies is formed to surround the cathode electrode over the entire length of the tube axis direction; at least the end piece portion of the cathode electrode and the foregoing The front end of the small-diameter tube body is aligned in the axial direction of the tube. The xenon flash lamp according to claim 1, wherein a trigger band is further disposed on an outer circumference of the small-diameter portion pipe body surrounding the front end portion of the cathode electrode. The xenon flash lamp according to claim 1, wherein the front end portion of the anode electrode and the front end of the small-diameter portion pipe are aligned in the axial direction of the tube. The xenon flash lamp according to any one of claims 1 to 3, wherein the electrode arrangement portion is a contraction structure in which the electrode and the small-diameter portion tube are heated and welded.