WO2002019385A1 - Hollow cathode lamp, atomic absorption analyzer, and atomic fluorescence analyzer - Google Patents

Abstract

A hollow cathode lamp (1), wherein a tubular member (8) is vertically installed on a stem (4) in a valve (2) to achieve an increase in productivity and a structure hard to produce the diffraction of discharge to an anode (7) from those other than a hollow cathode (10), whereby, the enclosure of the portion where the diffraction of discharge to the anode (7) is hard to occur can be achieved with such a simple structure that the tubular member (8) is installed vertically on the valve (2), the discharge in the tube axis (L) direction is assured in association with the adoption of the tubular member (8) extending in the tube axis (L) direction because the hollow electrode (10) is disposed concentrically to the tubular member (8), and the tubular member (8) having an effect for suppressing abnormal discharge can largely contribute to the workability in assembly and assist in the mass production of the lamp (1).

Description

 Holographic Sword Lamp, Atomic Absorption Spectrometer and Atomic Fluorescence Analyzer

 The present invention relates to a light source of an analyzer for performing an atomic absorption analysis or an atomic fluorescence analysis or the like, and a holo-power sword lamp used as a high-intensity bright line light source. Further, the present invention relates to an atomic absorption spectrometer and an atomic fluorescence analyzer using the above-mentioned holo-power lamp.

Background art

 Conventionally, as a technique in such a field, there is U.S. Pat. No. 4,885,504. The hollow sword lamp described in this publication generates a discharge between the hollow cathode and the anode, and spatters the surface of the hollow cathode with ions, so that the inside of the hollow cathode enters the discharge space. Atoms are scattered, and a predetermined spectrum line is generated by transfer of electron energy. Also, some of the spectral lines are deprived of energy by unexcited atoms in the discharge space, which causes self-absorption in the lamp, which reduces the intensity of the spectrum lines. In order to prevent this, an electron source (auxiliary cathode) for emitting thermoelectrons is provided separately from the hollow cathode in the lamp.

 However, the above-mentioned conventional holo-sword lamp has the following problems. That is, the lamp disclosed in the above-mentioned USP 4,885,504 discloses a method in which an anode is provided at the upper end of a stem pin fixed to a stem, and this anode is housed in a glass enclosure. Although the structure is such that discharge from other than the hollow cathode easily wraps around the anode, it also has a structure in which the components inside the bulb are supported by stem pins, making assembly work easier. There is a problem with evil.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and in particular, provides a hologram power sword lamp capable of generating a reliable discharge between a hollow cathode and an anode in consideration of assembly workability. The purpose is to do. Further, the present invention relates to such a holo It is another object of the present invention to provide an atomic absorption spectrometer and an atomic fluorescence spectrometer using a cathode lamp.

Disclosure of the invention

 The hollow sword lamp according to the present invention has a light emission window disposed at one end of the bulb, a stem disposed at the other end of the bulb, and a hollow cathode and an anode arranged in the bulb from the light emission window to the tube axis. In the holographic lamp in which are sequentially arranged, a cylindrical member extending in the tube axis direction is erected substantially at the center of the stem, the cylindrical member surrounds the anode, and the hollow cathode is concentric with the cylindrical member. It is characterized by being arranged in a way.

 This hollow sword lamp has a cylindrical member on the stem inside the bulb to improve productivity and to achieve a structure in which discharge from other than the hollow P electrode does not easily flow around the anode. It was erected. With this structure, the surrounding of the portion where discharge sneakage to the anode is likely to occur can be achieved with a simple configuration in which the tubular member is erected on the bulb. Furthermore, as a result of disposing the hollow electrode concentrically with respect to the tubular member, the discharge in the tube axis direction is ensured in combination with the use of the above-described tubular member extending in the tube axis direction. As described above, the tubular member that exerts the effect of suppressing the abnormal discharge greatly contributes to the assembling workability irrespective of whether it is formed integrally with the stem or as a separate member. Helps mass production of lamps.

 An atomic absorption spectrometer according to the present invention is an atomic absorption spectrometer for measuring a specific component contained in a sample, comprising: an atomizing means for atomizing a sample; A light source that irradiates an atomized sample with a light beam containing a resonance line, and a measuring unit that measures the absorbance of the incident light by allowing the light beam that has passed through the atomized sample to be incident. The light source comprises: a tubular member extending in the tube axis direction substantially standing at the center of the stem; the tubular member surrounding the anode; and a hollow P-polarized electrode concentric with the tubular member. It is characterized by being a holo-powered sword lamp placed in

This atomic absorption spectrometer uses the incident light of the light beam that has passed through the atomized sample. The holographic sword lamp used as a light source is a device that allows the measurement unit to measure the absorbance of the anode. In order to achieve a structure that prevents wraparound, a cylindrical member was erected on the stem inside the valve. With this structure, the surrounding of the portion where discharge is likely to flow into the anode is easily achieved with a simple structure when the valve is provided with a tubular member. Furthermore, as a result of disposing the hollow electrode concentrically with respect to the cylindrical member, the discharge in the tube axis direction is ensured in combination with the use of the above-described cylindrical member extending in the tube axis direction. As described above, the tubular member that exerts the effect of suppressing the abnormal discharge greatly contributes to the assembling workability irrespective of whether it is formed integrally with the stem or separately. Helps mass production of lamps.

 The atomic fluorescence spectrometer according to the present invention is an atomic fluorescence spectrometer for measuring a specific component contained in a sample, wherein the atom beam means for atomizing the sample and the light beam are atomized. A light source that irradiates the sample toward the sample, and a measuring unit that measures the intensity of the fluorescence emitted by the atoms excited by the light beam. And a hollow member surrounding the anode with a tubular member and a hollow cathode concentrically arranged with respect to the tubular member.

This atomic fluorescence analyzer is a device for measuring the intensity of fluorescence emitted by atoms excited by a light beam by a measuring unit. The holographic sword lamp as a light source used here improves productivity. At the same time, a tubular member was erected on the stem in the bulb to achieve a structure in which discharge from other than the hollow cathode did not easily flow around the anode. With this structure, the surrounding of a portion where discharge sneakage to the anode is likely to occur can be achieved with a simple configuration such that the tubular member is erected on the bulb. Furthermore, as a result of disposing the hollow electrode concentrically with respect to the tubular member, the discharge in the tube axis direction is ensured in combination with the use of the above-described tubular member extending in the tube axis direction. As described above, the tubular member that is effective in suppressing abnormal discharge is a Whether it is formed integrally with the lamp or as a separate member, it greatly contributes to the assembling workability, and contributes to the mass production of lamps.

BRIEF DESCRIPTION OF THE FIGURES

 FIG. 1 is an exploded perspective view showing a first embodiment of a holographic lamp according to the present invention.

 FIG. 2 is a cross-sectional view showing a state after the assembly of the holo-powered sword lamp shown in FIG. 1 is completed.

 FIG. 3 is a longitudinal sectional view of the holo-powered sword lamp shown in FIG.

 FIG. 4 is a perspective view showing a hollow cathode applied to the hollow source lamp according to the present invention.

 FIG. 5 is a sectional view showing a second embodiment of a holographic lamp according to the present invention.

 FIG. 6 is a sectional view showing a third embodiment of a holographic power lamp according to the present invention.

 FIG. 7 is a longitudinal sectional view of the holo-powered sword lamp shown in FIG.

 FIG. 8 is a cross-sectional view showing a fourth embodiment of a holographic lamp according to the present invention.

 FIG. 9 is a vertical sectional view of the holographic lamp shown in FIG.

 FIG. 10 is a sectional view showing a fifth embodiment of a holo-powered sword lamp according to the present invention.

 FIG. 11 is a cross-sectional view showing a sixth embodiment of a sword lamp according to the present invention.

 FIG. 12 is a cross-sectional view showing a seventh embodiment of a holo-powered sword lamp according to the present invention.

 FIG. 13 is a longitudinal sectional view of the holo-powered sword lamp shown in FIG.

FIG. 14 is a sectional view showing an eighth embodiment of a holographic lamp according to the present invention. is there.

 FIG. 15 is a longitudinal sectional view of the holo-powered sword lamp shown in FIG.

 FIG. 16 is a cross-sectional view showing a ninth embodiment of the holo-sword lamp according to the present invention.

 FIG. 17 is a longitudinal sectional view of the holo-powered sword lamp shown in FIG.

 FIG. 18 is a cross-sectional view showing a tenth embodiment of the holo-sword lamp according to the present invention.

 FIG. 19 is a sectional view showing a first embodiment of a holo-powered sword lamp according to the present invention.

 FIG. 20 is a cross-sectional view showing a twelfth embodiment of a holo-sword lamp according to the present invention.

 FIG. 21 is a diagram schematically showing an atomic absorption spectrometer and an atomic fluorescence analyzer according to the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION

 Hereinafter, embodiments of a holo-sword lamp, an atomic absorption spectrometer, and an atomic fluorescence analyzer according to the present invention will be described in detail with reference to the drawings.

 [First Embodiment]

 As shown in FIGS. 1 to 3, the holo-sword lamp 1 has a cylindrical bulb 2 made of borosilicate glass having an open lower end. By closing the upper end of the bulb 2, a circular light exit window 3 is formed at the upper end of the bulb 2, and predetermined light is emitted to the outside by the light exit window 3. A disc-shaped glass stem 4 is fused to the valve 2 so as to close the open side at the lower end, and the bulb 2 and the stem 4 form a glass sealed container 5. Four stem pins 6 a to 6 d made of metal cover extending in the tube axis L direction are fixed to the stem 4 by melting the glass stem 4.

Further, an exhaust anode tube 7 extending in the direction of the tube axis L is made of glass almost at the center of the stem 4. Stem 4 is fixed by melting. The anode tube 7 is used as an anode in the sealed container 5 and extends so as to penetrate the center of the stem 4 in the tube axis L direction. The anode tube 7 is used as a tube for injecting a predetermined gas (for example, neon gas) from the outside after evacuating the air in the sealed container 5 at the time of assembling the holo-powered sword lamp 1, When the sword lamp 1 emits light, it is connected to an external power supply to function as an anode. Thus, as a result of the anode tube 7 itself penetrating the stem 4, the anode tube 7 itself can be used as a lead wire. Furthermore, by making the anode itself into a tube, the surface area is enlarged, and accordingly, the heat dissipation effect is increased, and the input current value can be increased, so that the light output can be improved with a simple structure.

 A cylindrical member 8 made of ceramics extending in the direction of the tube axis L is accommodated in the sealed container 5, and the cylindrical member 8 is set up substantially at the center of the stem 4. The cylindrical member 8 concentrically surrounds the anode tube 7, and the stem pins 6 a to 6 d are arranged around the cylindrical member 8. Thus, the tubular member 8 is used as an electric partition between the stem pins 6 a to 6 d and the anode tube 7.

Further, in order to position the cylindrical member 8 on the stem 4, a support projection 9 is formed in the center of the stem 4 so as to surround the anode tube 7, and the support projection 9 is formed in a cylindrical shape. The member 8 is inserted into the opening 8a on the stem 4 side. Thereby, the cylindrical member 8 can be supported in the radial direction at the peripheral portion of the support projection 9. Therefore, when assembling the lamp 1, when the tubular member 8 is erected on the stem 4, it is possible to easily and surely assemble the tubular member 8 while positioning the tubular member 8 with respect to the stem 4. Further, in the sealed container 5, a cylindrical hollow cathode 10 is accommodated in an end (upper end) on the light emission window 3 side of both open ends of the cylindrical member 8. The hollow cathode 10 has a double structure of an outer cylindrical portion 10a made of stainless steel and an inner cylindrical portion 10b made of vanadium. The material of the inner cylinder portion 10b is changed according to the type of the element to be analyzed, and may be, for example, selenium or arsenic. Then, to form the hollow cathode 10 Therefore, the outer cylinder part 10a may not be adopted depending on the material of the inner cylinder part 1 O b.o

 Here, the hollow cathode 10 is accommodated in a suspended state at the upper end of the tubular member 8 via a cup-shaped holder 11 made of stainless steel or the like. The holder 11 has a main body 1 la extending in the tube axis L direction and inserted into the cylindrical member 8 from the opening 8 b on the light emission window 3 side, and a main body 1 la on the stem 4 side of the main body 1 la. A ring-shaped bottom 1 lb supporting the hollow cathode 10 is formed by projecting inward at the end (lower end), and outward at the light exit window 3 side (upper end) of the main body 11 a. A flange portion 11 c is formed so as to protrude and abut on the end face 8 c of the cylindrical member 8.

 With such a holder 11, the hollow cathode 10 is supported from below by the ring-shaped bottom portion 11b, so that the hollow cathode 10 can be inserted into the holder 11 from above. Further, by placing the flange portion 11c on the upper end surface 8c of the cylindrical member 8, the holder 11 is supported by the upper end surface 8c of the cylindrical member 8, and the inside of the cylindrical member 8 The hollow cathode 10 can be accommodated in a suspended state above the anode tube 7. Therefore, the hollow cathode 10 can be easily arranged concentrically with respect to the tubular member 8 by a simple operation of inserting the hollow cathode 10 into the holder 11 from above. Then, as a result of arranging the cylindrical member 8 concentrically with respect to the anode tube 7, the hollow cathode 10 is arranged concentrically with respect to the anode tube 7. Further, when the holder 11 is formed of a conductive metal, power can be supplied to the hollow P-polarized electrode 10 via the holder 11. Further, when the holder 11 is formed of a metal having good heat conductivity, the light output of the lamp 1 can be improved by the heat radiation effect of the holder 11.

Further, a hood portion 12 made of stainless steel, nickel, or the like is placed on the holder 11 supported by the tubular member 8. The hood portion 12 has a cylindrical main body portion 12 a extending in the direction of the pipe axis L, and a flange portion 12 b formed by projecting outward at a lower end of the main body portion 12 a. . Therefore, the flange 1 2 b of the hood 1 2 The hollow cathode 10 and the hood section 12 are reliably electrically connected via the holder 11 by making contact with the flange section 11 c of the first section. The hollow cathode 10 is pressed down from above by the flange portion 12 b of the hood portion 12, so that the hollow cathode 10 is properly prevented from sticking out.

 The use of such a hood portion 12 prevents the spatters generated from the hollow cathode 10 from being scattered over a wide area at the time of discharge, and prevents a large amount of spatters from adhering to the inner wall surface of the knob 2. At the same time, the density of the cathode element generated from the hollow cathode 10 can be increased in the hood 12. Note that the hood portion 12 also contributes to heat dissipation of the hollow cathode 10, whereby the operating current of the lamp 1 can be increased.

 Further, in the hood portion 12, a circular opening 12c is formed on the peripheral surface of the main body portion 12a, and a coil-shaped thermionic emission cathode (electron) is formed in front of the opening 12c. (Source) 13 are arranged. L-shaped connecting pins 14 are fixed to both ends of the thermionic emission cathode 13 by welding, and the connecting pins 14 are respectively welded to stem pins 6 a and 6 b extending from the stem 4 in the tube axis L direction. It is fixed and power can be supplied to thermionic emission cathode 13 from outside. The thermoelectron emission cathode 13 is formed by depositing barium oxide on the surface of a coil made of tungsten.

 Therefore, when the lamp 1 is turned on, the thermoelectrons emitted from the thermionic emission cathode 13 are used to discharge through the opening 12 c of the hood section 12, and the thermoelectron emission cathode 13 and the anode are used as discharges. When the cathode element is generated between the tube 7 and the hood portion 12, the non-excited state (ground state) cathode element existing at high density in the hood portion 12 is efficiently brought into the excited state. As a result, so-called self-absorption (a phenomenon in which part of the spectrum wire is deprived of energy by unexcited atoms in the discharge space, thereby reducing the intensity of the spectrum wire) occurs in the lamp 1. Less likely to occur. Thereby, the light output of the lamp 1 is improved.

Further, in order to fix the hood portion 12 on the holder 11, the flange portion 12 b of the hood portion 12 is pressed from above by the power supply plate 16 made of stainless steel. A circular through hole 16 a for inserting the main body 12 a of the hood portion 12 is formed in the center of the power supply plate 16, and a stem pin 6 a is formed beside the through hole 16 a. , 6b are formed with pin insertion holes 16b. Further, the power supply plate 16 is provided with a pair of left and right welding pieces 16c formed of tongue pieces. Each of the welding pieces 16c is formed by bending the disk-shaped power supply plate 16 at right angles along a radial line on both sides of the through hole 16a.

 Therefore, the hood portion 12 is placed on the holder 11 supported by the cylindrical member 8, the main body portion 12a is inserted into the through hole 16a of the power supply plate 16, and the stem pins 6a and 6a are inserted into the pin insertion holes 16b. After inserting 6b, the holder 11 and the hood 12 are welded, and the stem pins 6c and 6d are welded to the respective welding pieces 16c. As a result, the flange portion 12b of the hood portion 12 and the flange portion 1lc of the holder 11 are sandwiched and fixed between the upper end of the cylindrical member 8 and the power supply plate 16, and the power supply plate 16 and the hood portion are fixed. 1 2, the holder 11 and the hollow P pole 10 are electrically connected. Therefore, power can be supplied to these members by the stem pins 6c and 6d. By pressing the flange 11 c against the end face 8 c of the cylindrical member 8 with the power supply plate 16, there is no need to weld the holder 11 to the cylindrical member 8, and the workability of assembling the lamp 1 is improved. Becomes better.

 It should be noted that, by accommodating the stem pins 6a and 6b in the ceramic electrically insulating shield tube 17, it is possible to appropriately prevent discharge caused by the potential difference between the stem pins 6. Further, by inserting the shield tube 17 into the pin insertion hole 16b, electrical contact between the stem pins 6a and 6b and the power supply plate 16 is avoided.

 Next, a procedure for assembling the above-mentioned holing force sword lamp 1 will be described.

First, a stem 4 to which four stem pins 6 and an anode tube 7 are fixed is prepared. Then, insert the stem pins 6 a and 6 b into the shield tube 17. Then, the tubular member 8 is placed on the stem 4 so that the anode tube 7 is inserted into the tubular member 8. Thereby, the tubular member 8 is erected on the stem 4 so as to surround the anode tube 7. Thereafter, the main body 1 la of the holder 11 is inserted into the cylindrical member 8 from above, and the flange 11 c of the holder 11 is placed on the upper end of the cylindrical member 8. In this state, the hollow cathode 10 is dropped into the holder 11. Then, place the hood section 1 2 on the holder 1 1

<o

 After that, insert the main body 12a of the hood 12 into the through hole 16a of the power supply plate 16, and at the same time, insert the shield tube 17 into the pin insertion hole 16b, and insert the shield tube 17 into the hood 12. The power supply plate 16 is placed from above. In this state, orient the opening 1 2c of the hood 1 2 in a predetermined direction, weld the flange 1 2b and the flange 1 1c to the power supply plate 16, and attach the stem pin 6c to each welding piece 16c. , Weld the top of 6 d each time. As a result, the flange 12 of the hood 12 and the flange 11 of the holder 11 are tightly clamped and fixed between the upper end of the cylindrical member 8 and the power supply plate 16, and the stem pin 6 c, 6 d, the power supply plate 16, the hood portion 12, the holder 11, and the hollow cathode 10 are electrically connected.

 Then, with the coil-shaped thermoelectron emission cathode (electron supply source) 13 placed in front of the opening 12 c of the hood section 12, connect the connecting pins 14 to the upper ends of the stem pins 6 a and 6 b. To each other. As a result, the thermionic emission cathode 13 and the stem pins 6a and 6b are electrically connected. Then, after assembling the components on the stem 4, the assembly is inserted from the open side of the valve 2, and the open end of the valve 2 is fused to the periphery of the stem 4.

 Thereafter, with the lower end of the anode tube 7 opened, the air in the sealed container 5 is evacuated, and a predetermined gas (for example, neon gas or the like) is injected from the outside. Then, as shown in FIG. 2, the exposed portion of the anode tube 7 is cut into a predetermined length and the lower end thereof is crushed to close the sealed container 5 while maintaining the inside of the sealed container 5 at a predetermined gas pressure. Through a series of such operations, the assembly of the sword lamp 1 is completed.

The operation of the holo-cathode lamp 1 assembled in this manner will be briefly described. First, a predetermined voltage (for example, 500 V) is supplied between the hollow cathode 10 and the anode tube 7 via the stem pins 6c and 6d, and a discharge is generated between the two. Then, the neon gas atoms sealed in the sealed container 5 are ionized by this discharge. The cations generated by this ionization action are attracted to the hollow cathode 10 side and collide with the inner wall surface of the inner cylindrical portion 10b of the hollow cathode 10, and the cathode energy (vanadium) is not converted by the collision energy at this time. Scatters in the excited state (ground state). Then, the flying cathode element is excited by the discharge between the anode tube 7 and the hollow cathode 10, and transitions to the ground state again in a short time (about 10 to ⁸ seconds). At this time, vanadium-specific monochromatic light (spectral line) equal to the transition energy is emitted, and this light is output from the light exit window 3. In this case, since the sputter discharged from the hollow cathode 10 adheres to the inner wall surface of the hood portion 12, the inner wall surface of the bulb 2 is less likely to be contaminated with the sputter. Further, the hood portion 12 prevents the scattered cathode element from being scattered over a wide area, and as a result, the cathode element which has been sputtered in the hood portion 12 can be retained at a high density.

 At this time, by continuously supplying a predetermined voltage (for example, 3 V) to the thermionic emission cathode 13 through the stem pins 6a and 6b, thermions continue to be generated, and further, the stem pins 6a and 6b Since a predetermined voltage (for example, 200 V) is supplied between the cathode tube 7 and the anode tube 7, the thermoelectrons emitted from the thermoelectron emission cathode 13 are used to open the hood 1 2 opening 12 A discharge that passes through c is generated between the thermionic emission cathode 13 and the anode tube 7, and the discharge is present at a high density in the hood portion 12 in an unexcited state (base state). The element efficiently transitions to the excited state, and the light output of lamp 1 improves. Next, another embodiment of the sword lamp will be described. However, the description thereof is substantially different from that of the first embodiment, and the same or equivalent components as those of the first embodiment are denoted by the same reference numerals. And the description is omitted.

 [Second embodiment]

As shown in FIG. 4, the hollow cathode 21 has a double structure of an outer cylindrical portion 22 made of stainless steel or the like and an inner cylindrical portion 23 made of vanadium or the like. And the outer cylinder part At the upper end of 22, a flange portion 22 a protruding outward is formed. Such a hollow cathode 21 is used for a holo-sword lamp 20 shown in FIG. The hollow sword lamp 20 is configured so that the flange portion 2 1 a of the hollow cathode 21 is tightly held between the flange portion 11 c of the holder 11 and the flange portion 12 b of the hood portion 12. are doing. Thus, the hollow cathode 2 1, moths evening hardly attached in the holder 1 1, moreover, so that the power supply to the hollow P «2 1 is reliably achieved via the flange portion 2 2 a _c [Third Embodiment]

 The holo-sword lamp 25 shown in FIGS. 6 and 7 utilizes the hollow cathode 21 (see FIG. 4) described above. A metal (for example, stainless steel) plate 26 is disposed at the upper end of the cylindrical member 8. When the hollow cathode 21 is inserted into the cylindrical member 8 from above, the plate 26 forms a flange portion of the hollow cathode 21. 2 2a is supported. Then, the upper ends of the stem pins 6 c and 6 d penetrating the plate 26 are bent into an L shape, and the tip of the stem pin 6 c 6 d and the flange 22 of the hollow cathode 21 are welded. As a result, the hollow cathode 21 is prevented from sticking, and the power supply to the hollow cathode 21 is reliably achieved via the flange portion 22a.

 In addition, the ends of the stem pins 6 a and 6 b for supplying power to the thermionic emission cathode 13 penetrate the plate 26, and the stem pins 6 a and 6 b are formed of ceramics whose lower end is inserted into the plate 26. It is held by an electrically insulating support tube 27 made of. The hollow electron source lamp 25 is provided with a thermionic emission cathode 13 but is not provided with a hood. At the upper end of the Kovar metal anode tube 7, an impact-resistant cylindrical anode cap (protection member) 28 made of stainless steel, tungsten, molybdenum, or the like is fitted and fixed from above. By employing the anode cap 28, the tip of the anode tube 7 can be protected from collision of electrons, heat, and the like, and damage to the anode tube 7 can be avoided.

 [Fourth embodiment]

The holographic sword lamp 30 shown in FIGS. 8 and 9 is provided with a thermionic emission cathode 13. However, the hood is not provided, and a power supply plate 31 fixed by welding to the stem pins 6c and 6d is provided. The power supply plate 31 is disposed on the flange portion 11 c of the holder 11 and is brought into contact with the upper end surface of the outer cylindrical portion 10 a of the hollow cathode 10. As a result, the outer cylindrical portion 10a of the hollow cathode 10 and the flange portion 11c of the holder 11 are pressed from above by the power supply plate 31. As a result, the power supply to the hollow cathode 10 is reliably performed by the power supply plate 31 and the hollow cathode 10 is reliably prevented from jumping out of the holder 11. An anode cap 28 equivalent to that of the third embodiment is fitted and fixed to the upper end of the anode tube 7 from above.

 [Fifth Embodiment]

 The holing force sword lamp 35 shown in FIG. 10 is a cylindrical member made of ceramics or metal.

The cylindrical cylindrical holder 36 made of ceramics is placed on the upper end surface 8c of 8 so as to overlap, and the cylindrical member 8 and the holder 36 are aligned in a line in the tube axis L direction. The holder 36 extends in the direction of the tube axis L and is placed on an end face (upper end face) 8 c of the cylindrical member 8 on the light emission window 3 side; 6a has a ring-shaped bottom portion 36b which is formed to protrude inward at the end of the stem 4 and supports the hollow cathode 10.

 By simply dropping the hollow cathode 10 into the holder 11, the hollow P-polarized electrode 10 and the tubular member 8 can be easily aligned. By disposing the body 36 a of the holder 36 between the power supply plate 37 fixed to the stem pin 6 e for the cathode and the cylindrical member 8 erected on the stem 4, the holder 3 6 is sandwiched between the power supply plate 37 and the cylindrical member 8. Therefore, the holder 36 is prevented from jumping out by the power supply plate 37, and it is not necessary to weld the holder 36 to the tubular member 8, so that the assembling workability of the lamp 1 is improved.

By forming the holder 36 with electrically insulating ceramics, it is possible to prevent the discharge from sneaking into the hollow cathode 10, and the heat retaining effect of the holder 36 facilitates the generation of metal vapor. Improving the light output of lamp 1 Can be. Further, the power supply plate 37 is brought into contact with the upper end surface of the outer cylindrical portion 10a of the hollow cathode 10 and the power supply plate 37 presses the outer cylindrical portion 10a of the hollow cathode 10 and the holder 36 from above. So that it fits. This reliably prevents the hollow cathode 10 from jumping out of the holder 36. Then, the upper end portion of the stem pin 6 e penetrating the power supply plate 37 is bent, and the tip of the stem pin 6 e is welded to the upper surface of the power supply plate 37.

 [Sixth embodiment]

 In the holo-sword lamp 40 shown in FIG. 11, a hollow cathode 41 made of an element to be analyzed such as vanadium is directly fixed to an inner wall surface at an upper end of a cylindrical member 8 made of metal (for example, stainless steel). Thus, it is not necessary to use a holder, and the assembly process can be simplified. Further, an electrically insulating pipe 42 surrounding the metal tubular member 8 is erected on the stem 4. When the pipe 42 is formed of ceramics, it is possible to provide a heat radiation effect by the metal tubular member 8 and an abnormal discharge suppressing effect by the electrically insulating pipe 42.

 Further, the tubular member 8 and the pipe 42 are pressed from above by the power supply plate 43, thereby preventing the tubular member 8 and the pipe 42 from falling down. Then, the upper end portion of the stem pin 6 e penetrating the power supply plate 43 is bent, and the tip of the stem pin 6 e is welded to the upper surface of the power supply plate 43, and the hollow cathode is formed through the cylindrical member 8 and the power supply plate 43. 4 Supply power to 1.

 [Seventh embodiment]

A hollow member assembly 46 is used in the holing force sword lamp 45 shown in FIGS. 12 and 13. The cylindrical member assembly 46 includes a hollow cathode 47 made of an element such as vanadium, and a metal (for example, stainless) cylindrical member 8 having the hollow cathode 47 fixed to the inner wall surface at the upper end. The power supply plate 48 is fixed to the outer wall surface of the tubular member 8 by welding or the like. The power supply plate 48 is fixed in the middle of the cylindrical member 8 in the length direction, and the shield tube 17 is made to pass through the power supply plate 48. Therefore, the gap between the shield tube 1 mm and the cylindrical member 8 is reliably maintained by the power supply plate 48. You. Further, the stem pins 6 c and 6 d are fixed to a tongue piece 48 a provided on the power supply plate 48 by welding or the like.

 [Eighth Embodiment]

 As shown in FIGS. 14 and 15, the hollow cathode assembly 51 is used for the hollow sword lamp 50. The hollow cathode assembly 51 includes a hollow cathode 55 composed of an outer cylindrical portion 52 formed of stainless steel or the like and an inner cylindrical portion 53 formed of vanadium or the like, and a hollow cathode 55 extending outward from the upper end of the outer cylindrical portion 52. The power supply plate 54 is welded and fixed to the inner wall surface of the outer cylinder portion 52 so as to protrude. The shield tube 17 is passed through the power supply plate 54, and the stem pins 6c and 6d are fixed to the tongue piece 54a provided on the power supply plate 54 by welding or the like. Such a sword lamp 50 does not need to use a holder, and can simplify the assembly process.

 [Ninth embodiment]

 As shown in FIG. 16 and FIG. 17, the hollow cathode assembly 56 is used for the hollow sword lamp 55. The hollow cathode assembly 56 includes a hollow cathode 59 composed of an outer cylindrical portion 57 formed of stainless steel or the like and an inner cylindrical portion 58 formed of vanadium or the like. A power supply plate 58 is welded and fixed to the outer wall surface of the outer cylinder portion 57 so as to protrude. The power supply plate 58 is formed with a cylindrical fixed portion 58 a extending in the tube axis L direction, and the fixed portion 58 a is welded to the outer cylinder portion 57.

 Further, the outer cylinder portion 57 is placed on the upper end of the ceramic cylindrical member 8 and the upper end of the cylindrical member 8 is outwardly fixed by a fixed portion 58a protruding from the lower end of the outer cylinder portion 57. Support from. Further, the shield tube 17 is passed through the power supply plate 58, and the stem pins 6c and 6d are fixed to the tongue piece 58b provided on the power supply plate 58 by welding or the like. Such a sword lamp 55 does not require the use of a holder, and can simplify the assembling process.

[10th Embodiment] As shown in FIG. 18, a hollow cathode assembly 61 is used for the holo-powered sword lamp 60. The hollow cathode assembly 61 includes a hollow cathode 65 composed of an outer cylindrical portion 62 made of stainless steel or the like and an inner cylindrical portion 63 formed of vanadium or the like. And a power supply plate 64 welded and fixed to the outer wall surface of the outer cylinder portion 62 so as to protrude. The power supply plate 64 is formed with a cylindrical fixed portion 64 a extending in the tube axis L direction, and the fixed portion 64 a is welded to the outer peripheral surface of the outer cylindrical portion 62.

 The upper end of the tubular member 8 is inserted into the fixed portion 64 a from below, and the outer tubular portion 62 is placed on the upper end of the ceramic tubular member 8, and is placed under the hollow cathode 65. The upper end portion of the tubular member 8 is supported from the outside by the fixing portion 64 a protruding from the end. Further, a shield tube 17 is passed through the power supply plate 64, and a stem pin (not shown) is fixed to a tongue piece (not shown) provided on the power supply plate 64 by welding or the like. Such a holing force sword lamp 60 does not require the use of a holder, and can simplify the assembly process.

 [Eleventh Embodiment]

 As shown in FIG. 19, a hollow cathode assembly 71 is used for a hollow force sword lamp 70 without a thermionic emission cathode. The hollow cathode assembly 71 includes a hollow m 75 composed of an outer cylindrical portion 72 formed of stainless steel or the like and an inner cylindrical portion 73 formed of vanadium or the like, and an outer side at the lower end side of the outer cylindrical portion 72. And a power supply plate 74 welded and fixed to the outer wall surface of the outer cylinder portion 72 so as to protrude. The power supply plate 74 is formed with a cylindrical fixed portion 74 a extending in the tube axis L direction, and the fixed portion 74 a is welded to the outer peripheral surface of the outer cylindrical portion 72.

The upper end of the cylindrical member 8 is inserted into the fixed portion 74a, and the outer cylindrical portion 72 is placed on the upper end of the ceramic cylindrical member 8 and protrudes from the lower end of the hollow cathode 75. The upper end portion of the tubular member 8 is supported from the outside by the fixed portion 74a. Also, four cathode stem pins 6 are fixed to the power supply plate 7 4 by welding or the like. Have been.

 [First and second embodiments]

 As shown in FIG. 20, a hollow cathode assembly 81 is used for a hollow sword lamp 80 without a thermionic emission cathode. The hollow cathode assembly 81 includes a hollow cathode 85 composed of an outer cylindrical portion 82 formed of stainless steel or the like and an inner cylindrical portion 83 formed of vanadium or the like. And a power supply plate 84 welded and fixed to the outer wall surface of the outer cylinder portion 82 so as to protrude. The power supply plate 84 is formed with a cylindrical fixed portion 84 a extending in the tube axis L direction, and the fixed portion 84 a is welded to the outer peripheral surface of the outer cylinder portion 82.

 The upper end of the tubular member 8 is inserted into the fixed portion 84a,

2 is mounted on the upper end of the ceramic cylindrical member 8, and the upper end of the cylindrical member 8 is supported from the outside by a fixed portion 84a projecting from the lower end of the hollow cathode 85. Also, four stem pins 6 are fixed to the power supply plate 84 by welding or the like. By making the tubular member 8 thinner, the distance between the anode tube 7 and the tubular member 8 can be increased.

As shown in FIG. 21, the atomic absorption spectrometer 105 has atomizing means 101 for atomizing the sample 100. In addition, a light beam containing the resonance line of the target element to be measured contained in the sample 100 ° is emitted from the light source 102, and this light is applied to the atomized sample 100. Is done. Then, the light beam that has passed through the atomized sample 100 is incident on the measurement unit 103, and the target element is quantified based on the absorbance at this time. As the light source 102, the various holographic lamps described above can be applied. I have. Reference numeral 104 denotes a light condensing means composed of a reflection mirror for condensing a plurality of kinds of holopower sword lamps. The atomization performed by the atomic absorption spectrometer 105 generally uses a flame method or a flameless method using an electric furnace. As shown in FIG. 21, the atomic fluorescence analyzer 106 has an atomizing means 101 for atomizing the sample 100. The light beam from the light source 102 is applied to the sample 100 subjected to the atomization. Then, the fluorescence intensity of the element excited by the light beam is measured by the measuring unit 103 to quantify the target element. This light beam contains the resonance line of the target element. As the light source 102, the above-described various holo-sword lamps can be applied. ing. Note that reference numeral 104 denotes a light condensing means including a reflection mirror for condensing a plurality of kinds of sword lamps. The atomization performed by the atomic fluorescence analyzer 106 is generally performed by a flame method or a flameless method using an electric furnace.

 The above embodiment is summarized as follows.

 It is preferable that the stem pins for the cathode provided on the stem described above are arranged around the cylindrical member. When such a configuration is adopted, the tubular member is used as a partition wall between the P-polarization stem pin and the anode.

 In addition, it is preferable that a support projection to be inserted into the stem-side opening of the tubular member is provided at the center of the stem. The support projection is used when the tubular member and the stem are configured separately, and the adoption of the support projection allows the tubular member to be positioned with respect to the stem while being easily and reliably assembled. it can.

 It is preferable that the hollow cathode is fixed to the inner wall surface of the tubular member. This configuration simplifies the assembly process.

 Further, it is preferable that the cylindrical member is formed of a metal material having thermal conductivity, and that the hollow cathode is accommodated in the end of the cylindrical member on the light emission window side. When such a configuration is employed, the heat generated in the hollow cathode can be efficiently released to the outside through the metal cylindrical member, so that the amount of excited atoms can be increased. As a result, the light output can be increased.

Also, if an electrically insulating pipe is erected on the stem to surround the tubular member, It is suitable. That is, by surrounding the metal tubular member with the electrically insulating pipe, the heat dissipation effect of the metal tubular member and the effect of suppressing abnormal discharge by the electrically insulating pipe are provided.

 Preferably, the tubular member is formed of an electrically insulating material, and the hollow cathode is housed in the end of the tubular member on the light emission window side. When such a configuration is employed, abnormal discharge can be effectively suppressed.

 It is preferable that an electron supply source is arranged between the light exit window and the hollow cathode, and the electron supply source is fixed to the stem pin. The discharge using thermionic emission between the electron supply source and the anode continuously supplies electrons to unexcited atoms, thereby promoting the generation of excited atoms and causing a self-absorption phenomenon that causes a decrease in lamp output. Can be suppressed.

 In addition, a cylindrical hood portion extending in the tube axis direction is arranged concentrically with respect to the cylindrical member, and one end of the hood portion on the opening side is electrically connected to the hollow cathode, and a peripheral portion of the hood portion is provided. It is preferable to dispose an electron supply source in front of the opening formed in the surface. When such a configuration is adopted, the sputtered objects scattered from the hollow cathode are retained in the hood, so that more excited atoms are generated by the discharge using thermionic emission between the electron supply source and the anode. Light output can be improved. Furthermore, since the excited atoms are not scattered in the valve and can be attached to the inner wall surface of the hood, the inner wall surface of the valve is less likely to be contaminated.

Industrial applicability

 TECHNICAL FIELD The present invention relates to a light source of an analyzer for performing atomic absorption analysis or atomic fluorescence analysis, and a holo-force sword lamp used as a high-intensity bright line light source. And a reliable discharge is generated between them. Further, the present invention relates to an atomic absorption spectrometer and an atomic fluorescence analyzer using the above-mentioned hollow cathode lamp.

Claims

The scope of the claims  1. A light emitting window was arranged at one end of the bulb, a stem was arranged at the other end of the bulb, and a hollow cathode and an anode were sequentially arranged in the bulb axial direction from the light emitting window side within the bulb. In the holo power sword lamp,  A tubular member extending in the tube axis direction is erected substantially at the center of the stem, the tubular member surrounds the anode, and the hollow cathode is disposed concentrically with the tubular member. A sword lamp with holographic power.  2. The hollow sword lamp according to claim 1, wherein stem pins for the cathode provided on the stem are arranged around the cylindrical member.  3. The holocaust lamp according to claim 1, wherein a support projection is provided at a center of the stem so as to be inserted into a stem-side door of the tubular member.  4. The hollow sword lamp according to any one of claims 1 to 3, wherein the hollow cathode is fixed to an inner wall surface of the tubular member.  5. The cylindrical member is formed of a metal material having thermal conductivity, and the hollow cathode is housed in an end of the cylindrical member on the light emission window side. The holo cathode lamp according to any one of claims 1 to 4.  6. The hollow sword lamp according to claim 5, wherein an electrically insulating pipe is erected on the stem so as to surround the cylindrical member.  7. The cylindrical member is formed of an electrically insulating material, and the hollow cathode is housed in an end of the cylindrical member on the light emission window side. The holocaust lamp according to claim 1.  8. The electron supply source is disposed between the light exit window and the hollow cathode, and the electron supply source is fixed to the stem pin. Holo power sword lamp. 9.The cylindrical hood portion extending in the pipe axis direction is the same as the cylindrical member. One end on the opening side of the hood portion is electrically connected to the hollow cathode, and the electron supply source is arranged in front of an opening formed on a peripheral surface of the hood portion. The holocathode lamp according to any one of claims 1 to 8, characterized in that:  10 In an atomic absorption spectrometer for measuring a specific component contained in a sample,  Atomization means for atomizing the sample,  A light source for irradiating a light beam containing resonance lines of components contained in the sample toward the atomized sample;  A measurement unit configured to cause the light beam that has passed through the sample subjected to the atom irradiation to be incident thereon, and to measure an absorbance of the incident light,  The light source is  A hollow cathode lamp in which a tubular member extending in the tube axis direction is erected substantially at the center of a stem, the tubular member surrounds an anode, and a hollow cathode is arranged concentrically with respect to the tubular member. An atomic absorption spectrometer characterized by the following.  1 1. In an atomic fluorescence spectrometer for measuring specific components contained in a sample,  Atomization means for atomizing the sample,  A light source that irradiates a light beam toward the atomized sample;  A measuring unit for measuring the intensity of the fluorescence emitted by the atoms excited by the light beam,  The light source is  A hollow member extending in the tube axis direction is provided substantially at the center of the stem, the hollow member surrounds the anode, and the hollow cathode is arranged concentrically with the cylindrical member. An atomic fluorescence analyzer, which is a sword lamp.