Flash lamp

Abstract

To stabilize light output of a flash lamp.SOLUTION: A flash lamp 1 comprises a bulb which has a stem 11, a conductive linear member 15 which penetrates the stem 11, and a conductive linear member 16 which penetrates the stem 11. The conductive linear member 15 comprises a lead part 51 and a cathode 52 provided atop of the lead part 51, and the conductive linear member 16 comprises a lead part 61 and an anode 62 provided atop of the lead part 61, in which the cross-sectional area of the cathode 52 crossing a Z direction is different from the cross-sectional area of the lead part 51 crossing the Z direction, and the cross-sectional area of the anode 62 crossing the Z direction is different from the cross-sectional area of the lead part 61 crossing the Z direction. The cathode 52 comprises a first projection part protruding in an internal space S and a first embedded part embedded in the stem 11, and the cathode 62 comprises a second projection part protruding in the internal space S and a second embedded part embedded in the stem 11.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present disclosure relates to flashlamps. [Background technology]

[0002] There is known a flash lamp that generates a large amount of pulsed light by instantaneously releasing electric power (see, for example, Patent Document 1). In the flash lamp described in Patent Document 1, two lead pins extend so as to penetrate the stem, and the electrode portion provided at the tip of each lead pin has a larger diameter than the lead pin, so that discharge occurs between the two electrode portions. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 6637569 Summary of the Invention [Problem to be solved by the invention]

[0004] Further stabilization of light output is desired in this technical field.

[0005] The present disclosure describes a flashlamp capable of stabilizing light output. [Means for solving the problem]

[0006] A flash lamp according to an embodiment of the present disclosure includes a housing having a stem and defining an internal space, a first conductive linear member extending through the stem in a first direction, and a second conductive linear member extending through the stem in the first direction and spaced apart from the first conductive linear member in a second direction intersecting the first direction. The first conductive linear member includes a first lead portion and a first electrode portion provided at a tip of the first lead portion. The second conductive linear member includes a second lead portion and a second electrode portion provided at a tip of the second lead portion. A cross-sectional area of ​​the first electrode portion intersecting the first direction is different from a cross-sectional area of ​​the first lead portion intersecting the first direction, and a cross-sectional area of ​​the second electrode portion intersecting the first direction is different from a cross-sectional area of ​​the second lead portion intersecting the first direction. The first electrode portion includes a first protruding portion protruding from the stem into the internal space, and a first embedded portion connected to a tip of the first lead portion and embedded in the stem. The second electrode portion includes a second protruding portion that protrudes from the stem into the internal space, and a second embedded portion that is connected to a tip of the second lead portion and is embedded in the stem.

[0007] In this flash lamp, the first electrode portion of the first conductive linear member is provided at the tip of the first lead portion, and the tip of the first lead portion is connected to the first embedded portion embedded in the stem. Therefore, the first lead portion is not exposed to the internal space. Similarly, the second electrode portion of the second conductive linear member is provided at the tip of the second lead portion, and the tip of the second lead portion is connected to the second embedded portion embedded in the stem. Therefore, the second lead portion is not exposed to the internal space. In this way, since the first lead portion and the second lead portion are not exposed to the internal space of the housing, no discharge occurs between the first lead portion and the second lead portion. Therefore, it is possible to reliably generate a discharge between the first protruding portion of the first electrode portion and the second protruding portion of the second electrode portion. As a result, it is possible to suppress fluctuations in the discharge path and stabilize the light output.

[0008] In the above flash lamp, the stem may have a first surface facing the internal space and a second surface opposite to the first surface in the first direction. The distance between the first protrusion and the second protrusion in the second direction may be shortest on the first surface. This makes it possible for discharge to occur most easily in the direction along the first surface of the stem, since the distance between the portion of the first protrusion in contact with the first surface and the portion of the second protrusion in contact with the first surface is shortest. As a result, the discharge path is stabilized, making it possible to stabilize the light output.

[0009] In the above flash lamp, the first protrusion may have a shape approaching the second protrusion toward the first surface. This reduces the distance between the first protrusion and the second protrusion toward the first surface. Therefore, not only is discharge most likely to occur between the first protrusion and the second protrusion in the direction along the first surface of the stem, but discharge is less likely to occur in the portion of the first protrusion farther from the stem in the first direction. Therefore, the discharge path is less likely to fluctuate in the first direction. As a result, the discharge path is stabilized, making it possible to stabilize the light output.

[0010] In the above flash lamp, the second protrusion may have a shape approaching the first protrusion toward the first surface. This reduces the distance between the first protrusion and the second protrusion toward the first surface. Therefore, not only is discharge most likely to occur between the first protrusion and the second protrusion in the direction along the first surface of the stem, but discharge is less likely to occur in the portion of the second protrusion farther from the stem in the first direction. Therefore, the discharge path is less likely to fluctuate in the first direction. As a result, the discharge path is stabilized, making it possible to stabilize the light output.

[0011] In the above flash lamp, the first electrode portion may have a spherical shape. In this case, the first electrode portion is a rotating body centered on the axis of the first conductive linear member. Therefore, the first conductive linear member can be fixed to the stem without considering the angle of the rotation direction about the axis of the first conductive linear member. This makes it possible to simplify the arrangement of the first electrode portion.

[0012] In the above flash lamp, the first electrode portion may have a conical shape. In this case, the first electrode portion is a rotating body centered on the axis of the first conductive linear member. Therefore, the first conductive linear member can be fixed to the stem without considering the angle of the rotation direction centered on the axis of the first conductive linear member. This makes it possible to simplify the arrangement of the first electrode portion.

[0013] In the above flash lamp, the length of the first protrusion in the first direction may be equal to or less than the length of the discharge path in the first direction that occurs between the first protrusion and the second protrusion, and the length of the second protrusion in the first direction may be equal to or less than the length of the discharge path in the first direction. Since discharge occurs between the first protrusion and the second protrusion, the range in which discharge can occur in the first direction is limited by the lengths of the first protrusion and the second protrusion in the first direction. With the above configuration, it is possible to prevent the discharge path in the first protrusion and the second protrusion from fluctuating in the first direction. As a result, the discharge path is stabilized, and it is possible to stabilize the light output.

[0014] The flash lamp may further include a third conductive linear member extending to penetrate the stem in the first direction. The third conductive linear member may include a third lead portion and a sparker portion provided at a tip of the third lead portion. The sparker portion may include a third protrusion protruding from the stem into the internal space. The first electrode portion may be a cathode portion, and the second electrode portion may be an anode portion. The first protrusion may be disposed between the second protrusion and the third protrusion in the second direction. This allows a preliminary discharge to occur between the third protrusion and the first protrusion, making it possible to stably discharge between the first protrusion and the second protrusion.

[0015] In the flash lamp, the distance between the first protrusion and the third protrusion in the second direction may be shorter than the distance between the first protrusion and the second protrusion in the second direction. This makes it easier for a preliminary discharge to occur between the first protrusion and the third protrusion before a discharge occurs between the first protrusion and the second protrusion. As a result, a stable discharge can be generated between the first protrusion and the second protrusion.

[0016] The flash lamp may further include a fourth conductive linear member extending to penetrate the stem in the first direction. The fourth conductive linear member may include a fourth lead portion and a trigger probe portion provided at the tip of the fourth lead portion. The trigger probe portion may include a fourth protrusion portion protruding from the stem into the internal space. The fourth protrusion portion may be disposed between the first protrusion portion and the second protrusion portion in the second direction. This causes a preliminary discharge to occur between the first protrusion portion and the fourth protrusion portion and between the fourth protrusion portion and the second protrusion portion, and a main discharge occurs between the first protrusion portion and the second protrusion portion through the same discharge path as the discharge path of the preliminary discharge. As a result, the discharge path is stabilized, making it possible to stabilize the light output.

[0017] In the above flash lamp, the length of the fourth protrusion in the first direction may be equal to or less than the length of the first protrusion in the first direction and the length of the second protrusion in the first direction. This makes it possible to suppress fluctuations in the discharge path in the first direction when discharging between the first protrusion and the fourth protrusion. Similarly, it is possible to suppress fluctuations in the discharge path in the first direction when discharging between the second protrusion and the fourth protrusion. As a result, the discharge path is stabilized, making it possible to stabilize the light output. Effect of the Invention

[0018] According to the present disclosure, the light output of the flash lamp can be stabilized. [Brief description of the drawings]

[0019] [Figure 1] FIG. 1 is a perspective view of a flash lamp according to one embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Diagram 3] FIG. 3 is a plan view of the flash lamp shown in FIG. [Figure 4] FIG. 4 is a schematic diagram showing the main body, separated into a side tube and a stem, before the conductive linear members are attached. [Diagram 5] FIG. 5 is a partially enlarged view of FIG. [Figure 6] FIG. 6 is a partially enlarged view of FIG. [Figure 7] FIG. 7 is a cross-sectional view of a flash lamp according to another embodiment. [Figure 8] Figures 8(a) and 8(b) are cross-sectional views of modified conductive linear members shown in Figure 1. Figure 8(c) is a plan view of the conductive linear member shown in Figure 8(b). [Figure 9] 9(a) and 9(b) are cross-sectional views of another modified example of the conductive linear member shown in FIG. [Figure 10] FIG. 10 is a diagram showing a modified example of the conductive linear member shown in FIG. [Figure 11] FIG. 11 is a cross-sectional view of a modification of the stem shown in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0020] Hereinafter, an embodiment of the present disclosure will be described in detail with reference to the drawings. In each drawing, the same or corresponding parts are denoted by the same reference numerals, and duplicated explanations will be omitted. Each drawing shows an XYZ coordinate system. The Y direction is a direction that intersects (here, perpendicular to) the X direction (second direction) and the Z direction (first direction). The Z direction is a direction that intersects (here, perpendicular to) the X direction and the Y direction.

[0021] A schematic configuration of a flash lamp according to an embodiment will be described with reference to FIGS. 1 to 3. FIG. 1 is a perspective view of a flash lamp according to an embodiment. FIG. 2 is a cross-sectional view taken along line II-II in FIG. 1. FIG. 3 is a plan view of the flash lamp shown in FIG. 1. The flash lamp 1 shown in FIGS. 1 to 3 is a lamp that emits a large amount of light in an extremely short time, and is, for example, a lamp in which a rare gas is enclosed as a discharge gas. More specifically, the flash lamp 1 is, for example, a xenon flash lamp in which xenon is enclosed. The flash lamp 1 includes a bulb 10 (housing), a conductive linear member 15 (first conductive linear member), a conductive linear member 16 (second conductive linear member), a conductive linear member 17 (third conductive linear member), and an exhaust pipe 19.

[0022] In this embodiment, the bulb 10 is a cylindrical airtight container and is basically made of an insulating material (for example, a glass member or a ceramic member). The bulb 10 includes a main body 10B, a face plate 13, and a joining member 14. The bulb 10 is formed into a cylindrical shape by stacking the main body 10B and the face plate 13 in the Z direction and connecting them with the joining member 14. Specifically, the main body 10B and the face plate 13 are stacked via the joining member 14 so that the central axis of the main body 10B and the central axis of the face plate 13 are coaxial. An internal space S is defined by the main body 10B, the joining member 14, and the face plate 13. For convenience of explanation, the stacking direction of each component of the bulb 10 may be described as "upper", and the direction from the face plate 13 to the main body 10B may be described as "lower". In FIG. 2 and FIG. 3, the face plate 13 and the joining member 14 are omitted from the configuration of the flash lamp 1.

[0023] The main body 10B is a cylindrical member with an open upper end face. The main body 10B is made of an insulating material such as glass (more specifically, borosilicate glass). The main body 10B has a stem 11 and a side tube 12. The stem 11 and the side tube 12 are integrally molded members.

[0024] The stem 11 is a part that forms the bottom plate of the main body 10B. The stem 11 has a disk-like shape. The thickness of the stem 11 is greater than the thickness of the face plate 13. The stem 11 has a face 11a (first face) and a face 11b (second face). The face 11a is a face that faces the internal space S. The face 11b is a face opposite to the face 11a in the Z direction (up-down direction).

[0025] The stem 11 is provided with a through hole 11g. The through hole 11g passes through the stem 11 in the Z direction. An exhaust pipe 19 is inserted through the through hole 11g. The exhaust pipe 19 is fused and fixed in a heated environment while being inserted through the through hole 11g, thereby hermetically sealing the through hole 11g. The conductive linear members 15 to 17 are inserted through the stem 11 in the Z direction. The conductive linear members 15 to 17 are arranged in the X direction in the order of the conductive linear member 17, the conductive linear member 15, and the conductive linear member 16.

[0026] Here, reference is further made to FIG. 4. FIG. 4 is a schematic diagram showing the main body 10B separated into the side tube 12 and the stem 11 before the conductive linear members 15-17 are attached to the main body 10B. As described above, the stem 11 and the side tube 12 are integrally molded, but in FIG. 4, for convenience of explanation, the main body 10B is shown in a state in which the stem 11 and the side tube 12 are separated. Note that the stem 11 before the conductive linear members 15-17 are attached to the main body 10B does not have through holes through which the conductive linear members 15-17 are inserted. In a state in which the stem 11 is softened in a heating environment, the conductive linear members 15-17 are pressed into the stem 11 from the surface 11a toward the surface 11b of the stem 11 and inserted into the stem 11. In this state, the conductive linear members 15 to 17 are fusion-fixed, so that the gaps between the stem 11 and each of the conductive linear members 15 to 17 are air-tightly sealed.

[0027] The distance between the center of through hole 11g and the central axis of conductive linear member 15 is greater than the distance between the center of through hole 11g and center C of stem 11. Similarly, the distance between the center of through hole 11g and the central axis of conductive linear member 16 is greater than the distance between the center of through hole 11g and center C of stem 11. Similarly, the distance between the center of through hole 11g and the central axis of conductive linear member 17 is greater than the distance between the center of through hole 11g and center C of stem 11.

[0028] The side tube 12 is a part having a cylindrical shape with both ends open. The side tube 12 is stacked on the stem 11 in the Z direction and is placed on the surface 11a of the stem 11. When viewed from the Z direction, the outer shape of the side tube 12 is substantially the same as the outer shape of the stem 11. The side tube 12 has a through hole 12a at its center, which penetrates the side tube 12 in the thickness direction. The through hole 12a has a shape in which the hole diameter continuously increases as it moves away from the stem 11. In other words, the through hole 12a is configured by an inclined surface having a tapered shape whose diameter continuously decreases downward. The side tube 12 is provided so as to surround the periphery of the cathode 52, the anode 62, and the sparker part 72 described later. As described above, the through hole 12a has a shape in which the hole diameter continuously increases as it moves away from the stem 11, so that the volume of the internal space S increases as it moves away from the stem 11. As a result, when the discharge gas is injected into the internal space S from the exhaust pipe 19, a larger amount of discharge gas can be injected into the internal space S compared to a container having an inner wall surface extending perpendicularly from the boundary between the side tube 12 and the surface 11a. This can contribute to a longer life of the flash lamp 1.

[0029] The face plate 13 is a disk-shaped light exit window provided to face the stem 11. The face plate 13 is made of a light-transmitting material such as glass (more specifically, ultraviolet (UV) light-transmitting glass). The face plate 13 is thinner than the stem 11. The face plate 13 is bonded to the upper end surface of the main body 10B (side tube 12) via a joining member 14. When viewed from the Z direction, the outer shape of the face plate 13 is substantially the same as the outer shape of the side tube 12. The joining member 14 is sandwiched between the side tube 12 and the face plate 13 in the Z direction. For example, an adhesive is used as the joining member 14, but other materials such as frit glass may also be used. When viewed from the Z direction, the outer shape of the arrangement area of ​​the joining member 14 is slightly smaller than the outer shape of the face plate 13. By joining the side tube 12 and the face plate 13 with the joining member 14, the through hole 12a is airtightly sealed.

[0030] Each of the conductive linear members 15-17 is a member extending linearly in the Z direction so as to penetrate the stem 11. Each of the conductive linear members 15-17 is formed from a conductive material obtained by mixing an electron-emitting material into a conductive base material. As the conductive base material, for example, a high-melting point metal such as molybdenum or tungsten is used, and as the electron-emitting material, for example, one or more oxides of lanthanum, yttrium, zirconium, barium, scandium, strontium, neodymium, samarium, calcium, and hafnium are used. For example, when glass is used as the stem 11, molybdenum may be used as the base material of the conductive linear members 15-17 from the viewpoint of the thermal expansion coefficient. As a more specific example, lanthanum molybdenum, which is an alloy of molybdenum as the base material and lanthanum oxide as the electron-emitting material, may be used.

[0031] Here, the conductive linear members 15 to 17 will be described in detail with further reference to Fig. 5 and Fig. 6. Fig. 5 is a partial enlarged view of Fig. 2. Fig. 6 is a partial enlarged view of Fig. 5. As shown in Figs. 5 and 6, the conductive linear member 15 has a lead portion 51 (first lead portion) and a cathode 52 (first electrode portion). The lead portion 51 and the cathode 52 may be integrally molded members or may be separate bodies.

[0032] The lead portion 51 is a member for fixing the cathode 52 at a desired position in the internal space S and supplying power to the cathode 52. The lead portion 51 has a linear shape and extends in the Z direction so as to penetrate the stem 11. The lead portion 51 is fused and fixed in a state where it is inserted into the stem 11. The lead portion 51 is not exposed to the internal space S, and the entire lead portion 51 is located below the surface 11a.

[0033] The cathode 52 is also referred to as a negative electrode portion. The cathode 52 is provided at the tip of the lead portion 51. The cathode 52 has a spherical shape. A cross-sectional area of ​​the cathode 52 in a direction along the plane S2 is different from a cross-sectional area of ​​the lead portion 51 in a direction along the plane S1. The planes S1 and S2 are both imaginary planes extending in a direction intersecting (here, perpendicular to) the Z direction, and the planes S1 and S2 are parallel to each other. In this embodiment, the cross-sectional area of ​​the cathode 52 is larger than the cross-sectional area of ​​the lead portion 51. In other words, the diameter of the cathode 52 is larger than the diameter of the lead portion 51.

[0034] The cathode 52 has an embedded portion 53 (first embedded portion) and a protruding portion 54 (first protruding portion). The embedded portion 53 is a portion that is embedded in the stem 11. The embedded portion 53 is fused and fixed in the stem 11 while being embedded therein. The embedded portion 53 is connected to the tip of the lead portion 51 within the stem 11. Specifically, the tip of the lead portion 51 is connected to the lower end of the embedded portion 53. In this embodiment, the embedded portion 53 has a hemispherical shape. Specifically, the embedded portion 53 is the lower half of the cathode 52.

[0035] The protrusion 54 is a portion that protrudes from the stem 11 (surface 11a) into the internal space S. The protrusion 54 has a shape that approaches the protrusion 64 described below as it approaches the surface 11a in the Z direction. In this embodiment, the protrusion 54 has a hemispherical shape. Specifically, the protrusion 54 is the upper half of the cathode 52. The length L1 of the protrusion 54 in the Z direction is the amount of protrusion of the protrusion 54 from the surface 11a in the Z direction. The length L1 is set to be, for example, equal to or less than the length in the Z direction of the discharge path generated between the protrusion 54 and the protrusion 64.

[0036] Of the conductive linear members 15, only the protruding portions 54 are exposed to the internal space S. The boundary between the embedded portion 53 and the protruding portions 54 includes the center of the cathode 52 (the center point of the sphere). The boundary between the embedded portion 53 and the protruding portions 54 is located on the surface 11a, and its entire circumference is in close contact with the surface 11a of the stem 11 without any gaps. This causes the gap between the cathode 52 and the stem 11 to be airtightly sealed.

[0037] The conductive linear member 16 has a lead portion 61 (second lead portion) and an anode 62 (second electrode portion). The lead portion 61 and the anode 62 may be an integrally molded member or may be separate bodies.

[0038] The lead portion 61 is a member for fixing the anode 62 at a desired position in the internal space S and supplying power to the anode 62. The lead portion 61 has a linear shape and extends in the Z direction so as to penetrate the stem 11. The lead portion 61 is fused and fixed in a state where it is inserted into the stem 11. The lead portion 61 is not exposed to the internal space S, and the entire lead portion 61 is located below the surface 11a.

[0039] The anode 62 is also referred to as a positive electrode portion, and has a different electrical polarity from the cathode 52 due to the difference in polarity of the applied voltage. The anode 62 is provided at the tip of the lead portion 61. The anode 62 has a spherical shape. The cross-sectional area of ​​the anode 62 in the direction along the plane S2 is different from the cross-sectional area of ​​the lead portion 61 in the direction along the plane S1. In this embodiment, the cross-sectional area of ​​the anode 62 is larger than the cross-sectional area of ​​the lead portion 61. In other words, the diameter of the anode 62 is larger than the diameter of the lead portion 61.

[0040] The anode 62 has an embedded portion 63 (second embedded portion) and a protruding portion 64 (second protruding portion). The embedded portion 63 is a portion that is embedded in the stem 11. The embedded portion 63 is fused and fixed in the stem 11 while being embedded therein. The embedded portion 63 is connected to the tip of the lead portion 61 within the stem 11. Specifically, the tip of the lead portion 61 is connected to the lower end of the embedded portion 63. In this embodiment, the embedded portion 63 has a hemispherical shape. Specifically, the embedded portion 63 is the lower half of the anode 62.

[0041] The protrusion 64 is a portion that protrudes from the stem 11 (surface 11a) into the internal space S. The protrusion 64 has a shape that approaches the protrusion 54 as it approaches the surface 11a in the Z direction. In this embodiment, the protrusion 64 has a hemispherical shape. Specifically, the protrusion 64 is the upper half of the anode 62. The length L2 of the protrusion 64 in the Z direction is the amount of protrusion of the protrusion 64 from the surface 11a in the Z direction. The length L2 is substantially the same as the length L1, and is set, for example, to be equal to or shorter than the length in the Z direction of the discharge path generated between the protrusion 54 and the protrusion 64.

[0042] Of the conductive linear members 16, only the protruding portions 64 are exposed to the internal space S. The boundary between the embedded portion 63 and the protruding portions 64 includes the center of the anode 62 (the center point of the sphere). The boundary between the embedded portion 63 and the protruding portions 64 is located on the surface 11a, and its entire circumference is in close contact with the surface 11a of the stem 11 with no gap. This causes the gap between the anode 62 and the stem 11 to be airtightly sealed.

[0043] The conductive linear member 17 has a lead portion 71 (third lead portion) and a sparker portion 72. The lead portion 71 and the sparker portion 72 may be an integrally molded member or may be separate bodies.

[0044] The lead portion 71 is a member for fixing the sparker portion 72 at a desired position in the internal space S and for supplying power to the sparker portion 72. The lead portion 71 has a linear shape and extends in the Z direction so as to penetrate the stem 11. The lead portion 71 is fused and fixed in a state where it is inserted into the stem 11. The lead portion 71 is not exposed to the internal space S, and the entire lead portion 71 is located below the surface 11a.

[0045] The sparker portion 72 is provided at the tip of the lead portion 71. The sparker portion 72 has a spherical shape. A cross-sectional area of ​​the sparker portion 72 in a direction along the plane S2 and a cross-sectional area of ​​the lead portion 71 in a direction along the plane S1 are different from each other. In this embodiment, the cross-sectional area of ​​the sparker portion 72 is larger than the cross-sectional area of ​​the lead portion 71. In other words, the diameter of the sparker portion 72 is larger than the diameter of the lead portion 71.

[0046] The sparker portion 72 has an embedded portion 73 and a protruding portion 74 (third protruding portion). The embedded portion 73 is a portion that is embedded in the stem 11. The embedded portion 73 is fused and fixed in the state that it is embedded in the stem 11. The embedded portion 73 is connected to the tip of the lead portion 71 in the stem 11. Specifically, the tip of the lead portion 71 is connected to the lower end of the embedded portion 73. In this embodiment, the embedded portion 73 has a hemispherical shape. Specifically, the embedded portion 73 is the lower half of the sparker portion 72.

[0047] The protrusion 74 is a portion that protrudes from the stem 11 (surface 11a) into the internal space S. The protrusion 74 has a shape that approaches the protrusion 54 as it approaches the surface 11a in the Z direction. In this embodiment, the protrusion 74 has a hemispherical shape. Specifically, the protrusion 74 is the upper half of the sparker portion 72. The length L3 of the protrusion 74 in the Z direction is the amount of protrusion of the protrusion 74 from the surface 11a in the Z direction. The length L3 is substantially the same as the lengths L1 and L2, and is set, for example, to be equal to or less than the length in the Z direction of the discharge path generated between the protrusion 54 and the protrusion 64.

[0048] Of the conductive linear member 17, only the protruding portion 74 is exposed to the internal space S. The boundary between the embedded portion 73 and the protruding portion 74 includes the center of the sparker portion 72 (the center point of the sphere). The boundary between the embedded portion 73 and the protruding portion 74 is located on the surface 11a, and its entire circumference is in close contact with the surface 11a of the stem 11 without any gap. This causes the gap between the sparker portion 72 and the stem 11 to be airtightly sealed.

[0049] The protrusion 54, the protrusion 64, and the protrusion 74 are arranged in the X direction in the order of the protrusion 74, the protrusion 54, and the protrusion 64. In other words, the protrusion 54 is disposed between the protrusions 74 and 64 in the X direction. Since the protrusion 54 has a semispherical shape, it approaches the protrusions 64 and 74, respectively, as it approaches the surface 11a of the stem 11. Since the boundary between the embedded portion 53 and the protrusion 54 includes the center of the cathode 52 (the center point of the sphere), the protrusion 54 is closest to the protrusions 64 and 74 at the boundary between the embedded portion 53 and the protrusion 54 (the portion where the protrusion 54 contacts the surface 11a).

[0050] Similarly, since the protrusion 64 has a hemispherical shape, it approaches the protrusion 54 toward the surface 11a of the stem 11. Since the boundary between the embedded portion 63 and the protrusion 64 includes the center of the anode 62 (the center point of the sphere), the protrusion 64 approaches the protrusion 54 most closely at the boundary between the embedded portion 63 and the protrusion 64 (the portion of the protrusion 64 that contacts the surface 11a). Since the protrusion 74 has a hemispherical shape, it approaches the protrusion 54 more closely at the surface 11a of the stem 11. Since the boundary between the embedded portion 73 and the protrusion 74 includes the center of the sparker portion 72 (the center point of the sphere), the protrusion 74 approaches the protrusion 54 most closely at the boundary between the embedded portion 73 and the protrusion 74 (the portion of the protrusion 74 that contacts the surface 11a).

[0051] Therefore, the distance in the X direction between the protrusion 54 and the protrusion 64 decreases monotonically from the distance D2 to the distance D1. The distance D1 is the distance in the X direction between the protrusion 54 and the protrusion 64 on the surface 11a of the stem 11. The distance D2 is the distance in the X direction between the apex of the cathode 52 in the Z direction and the apex of the anode 62 in the Z direction. The distance in the X direction between the protrusion 54 and the protrusion 74 decreases monotonically from the distance D4 to the distance D3. The distance D3 is the distance in the X direction between the protrusion 54 and the protrusion 74 on the surface 11a of the stem 11. The distance D4 is the distance in the X direction between the apex of the cathode 52 in the Z direction and the apex of the sparker portion 72 in the Z direction. The distance D3 is shorter than the distance D1. The distance D4 is shorter than the distance D2.

[0052] The exhaust pipe 19 is a tubular metal member for exhausting (evacuating) the internal space S. The exhaust pipe 19 is made of, for example, Kovar metal. The diameter of the exhaust pipe 19 is larger than the diameter of any of the lead portions 51, 61, 71. The exhaust pipe 19 extends in the Z direction so as to penetrate the stem 11. The exhaust pipe 19 is used to exhaust the internal space S, and then to inject a discharge gas into the internal space S. FIG. 1 shows the exhaust pipe 19 in a sealed and cut state after being used to inject the discharge gas, but when used for exhausting and injecting the discharge gas, the exhaust pipe 19 extends further downward.

[0053] The exhaust pipe 19 is fused and fixed to the stem 11 in a state where it is inserted through the through hole 11g of the stem 11. The tip of the exhaust pipe 19 is disposed substantially flush with the surface 11a of the stem 11. The distance between the exhaust pipe 19 and the cathode 52 is greater than the distance between the exhaust pipe 19 and the center C of the surface 11a. The distance between the exhaust pipe 19 and the anode 62 is greater than the distance between the exhaust pipe 19 and the center C of the surface 11a. The distance between the exhaust pipe 19 and the sparker portion 72 is greater than the distance between the exhaust pipe 19 and the center C of the surface 11a. That is, the exhaust pipe 19, the cathode 52, the anode 62, and the sparker portion 72 are provided in regions on the opposite sides of the center C of the surface 11a.

[0054] In the flash lamp 1, exhaust pipe 19 is directly or indirectly connected to a device (not shown) such as a vacuum pump, and thereby exhaust of the internal space S is performed via exhaust pipe 19. After exhaust, a discharge gas is sealed in the internal space S via exhaust pipe 19, and the flash lamp 1 becomes capable of discharging.

[0055] Next, the operation of the flash lamp 1 of this embodiment will be described with reference to Fig. 1. In the flash lamp 1, first, a predetermined voltage is applied between the protrusions 54 and 64 by a main power supply (not shown) electrically connected to the lead portions 51 and 61. In this state, a pulse voltage is applied to the cathode 52, the anode 62, and the sparker portion 72 by a trigger power supply (not shown) electrically connected to the lead portions 51, 61, and 71.

[0056] Application of such a voltage first causes a discharge in the sparker portion 72, which emits ultraviolet light (UV light). This emission of UV light causes photoelectrons to be emitted from the protrusions 54 and 64, ionizing the discharge gas in the internal space S. Then, following the discharge by the sparker portion 72, a preliminary discharge occurs between the protrusions 54 and 64. Then, a main discharge (arc discharge) occurs between the protrusions 54 and 64 in the same path as the preliminary discharge. This causes the flash lamp 1 to emit pulsed light.

[0057] As described above, in the flash lamp 1, the cathode 52 of the conductive linear member 15 is provided at the tip of the lead portion 51, and the tip of the lead portion 51 is connected to the embedded portion 53 embedded in the stem 11. Therefore, the lead portion 51 is not exposed to the internal space S. Similarly, the anode 62 of the conductive linear member 16 is provided at the tip of the lead portion 61, and the tip of the lead portion 61 is connected to the embedded portion 63 embedded in the stem 11. Therefore, the lead portion 61 is not exposed to the internal space S. In this way, since the lead portion 51 and the lead portion 61 are not exposed to the internal space S, no discharge occurs between the lead portion 51 and the lead portion 61. Therefore, a discharge can be reliably generated between the protruding portion 54 of the cathode 52 and the protruding portion 64 of the anode 62. As a result, it is possible to suppress fluctuations in the discharge path and stabilize the light output.

[0058] The distance in the X direction between the protrusions 54 and 64 is shortest on the surface 11a of the stem 11. In other words, the distance between the portion of the protrusion 54 that contacts the surface 11a and the portion of the protrusion 64 that contacts the surface 11a is shortest, so discharge tends to occur in the direction along the surface 11a. As a result, the discharge path is stabilized, and the light output can be stabilized.

[0059] The protrusion 54 has a shape approaching the protrusion 64 toward the surface 11a. Specifically, the protrusion 54 has a hemispherical shape. In this configuration, the distance between the protrusion 54 and the protrusion 64 in the X direction becomes smaller toward the surface 11a. Therefore, not only is the discharge most likely to occur between the protrusion 54 and the protrusion 64 in the direction along the surface 11a, but the discharge is less likely to occur in the portion of the protrusion 54 farther away from the stem 11 in the Z direction. Therefore, the discharge path is less likely to fluctuate in the Z direction. As a result, the discharge path is stabilized, making it possible to stabilize the light output.

[0060] Similarly, the protrusion 64 has a shape approaching the protrusion 54 toward the surface 11a. Specifically, the protrusion 64 has a hemispherical shape. In this configuration, the distance in the X direction between the protrusion 54 and the protrusion 64 becomes smaller toward the surface 11a. Therefore, not only is the discharge most likely to occur between the protrusion 54 and the protrusion 64 in the direction along the surface 11a, but the discharge is less likely to occur in the portion of the protrusion 64 farther away from the stem 11 in the Z direction. Therefore, the discharge path is less likely to fluctuate in the Z direction. As a result, the discharge path is stabilized, making it possible to stabilize the light output.

[0061] Each of the cathode 52, the anode 62, and the sparker portion 72 has a spherical shape. That is, the cathode 52 is a rotating body centered on the axis of the conductive linear member 15. The anode 62 is a rotating body centered on the axis of the conductive linear member 16. The sparker portion 72 is a rotating body centered on the axis of the conductive linear member 17. Therefore, regardless of the angle of the rotation direction about the axis of the conductive linear member 15, the distance in the X direction between the cathode 52 and the anode 62 and the distance in the X direction between the cathode 52 and the sparker portion 72 are constant. Therefore, the conductive linear member 15 can be fixed to the stem 11 without considering the angle of the rotation direction about the axis of the conductive linear member 15. Similarly, the conductive linear member 16 can be fixed to the stem 11 without considering the angle of the rotation direction about the axis of the conductive linear member 16. The conductive linear member 17 can be fixed to the stem 11 without considering the angle in the rotation direction around the axis of the conductive linear member 17. This makes it possible to simplify the arrangement of the cathode 52, the anode 62, and the sparker portion 72.

[0062] Since discharge occurs between protrusions 54 and 64, the range in which discharge can occur in the Z direction is limited by the lengths of protrusions 54 and 64 in the Z direction. Length L1 of protrusion 54 in the Z direction is equal to or less than the length in the Z direction of the discharge path occurring between protrusions 54 and 64. Length L2 of protrusion 64 in the Z direction is equal to or less than the length in the Z direction of the discharge path. With this configuration, it is possible to prevent the discharge path in protrusions 54 and 64 from fluctuating in the Z direction. As a result, the discharge path is stabilized, making it possible to stabilize the light output.

[0063] In the flash lamp 1, the protrusion 54 is disposed between the protrusions 64 and 74 in the X direction. This allows a preliminary discharge to occur between the protrusions 74 and 54, making it possible to stably discharge between the protrusions 54 and 64.

[0064] Distance D3 is shorter than distance D1. Therefore, preliminary discharge between protrusion 54 and protrusion 74 is more likely to occur before discharge between protrusion 54 and protrusion 64. As a result, stable discharge can be generated between protrusion 54 and protrusion 64.

[0065] Next, a schematic configuration of a flash lamp according to another embodiment will be described with reference to Fig. 7. Fig. 7 is a cross-sectional view of a flash lamp according to another embodiment. As shown in Fig. 7, flash lamp 1A differs from flash lamp 1 mainly in that flash lamp 1A further includes conductive linear member 18 (fourth conductive linear member).

[0066] The conductive linear member 18 is a member extending linearly in the Z direction so as to penetrate the stem 11. The conductive linear member 18 is formed from a conductive material obtained by mixing a conductive base material with a material that easily emits electrons, similar to the conductive linear members 15 to 17. The conductive material may be the same as the conductive linear members 15 to 17, and detailed description thereof will be omitted here. Note that the stem 11 before the conductive linear member 18 is attached to the main body 10B does not have a through hole through which the conductive linear member 18 is inserted. In a state in which the stem 11 is softened in a heating environment, the conductive linear member 18 is pushed into the stem 11 from the surface 11a to the surface 11b of the stem 11 and inserted into the stem 11. In this state, the conductive linear member 18 is fused and fixed, so that the gap between the stem 11 and the conductive linear member 18 is hermetically sealed.

[0067] The conductive linear member 18 has a lead portion 81 (fourth lead portion) and a trigger probe portion 82. The lead portion 81 and the trigger probe portion 82 may be an integrally molded member, or may be separate bodies.

[0068] The lead portion 81 is a member for fixing the trigger probe portion 82 at a desired position in the internal space S and for supplying power to the trigger probe portion 82. The lead portion 81 has a linear shape and extends in the Z direction so as to penetrate the stem 11. The lead portion 81 is fused and fixed in a state where it is inserted into the stem 11. The lead portion 81 is not exposed to the internal space S, and the entire lead portion 81 is located below the surface 11a.

[0069] The trigger probe portion 82 is provided at the tip of the lead portion 81. The trigger probe portion 82 has a spherical shape. A cross-sectional area of ​​the trigger probe portion 82 in a direction along the plane S2 (see FIG. 5) is different from a cross-sectional area of ​​the lead portion 81 in a direction along the plane S1 (see FIG. 5). In this embodiment, the cross-sectional area of ​​the trigger probe portion 82 is larger than the cross-sectional area of ​​the lead portion 81. In other words, the diameter of the trigger probe portion 82 is larger than the diameter of the lead portion 81.

[0070] The trigger probe portion 82 has an embedded portion 83 and a protruding portion 84 (fourth protruding portion). The embedded portion 83 is a portion that is embedded in the stem 11. The embedded portion 83 is fused and fixed in the state that it is embedded in the stem 11. The embedded portion 83 is connected to the tip of the lead portion 81 in the stem 11. Specifically, the tip of the lead portion 81 is connected to the lower end of the embedded portion 83. In this embodiment, the embedded portion 83 has a hemispherical shape. Specifically, the center of the trigger probe portion 82 is included in the embedded portion 83. In other words, the embedded portion 83 is a portion that is equal to or greater than the lower half of the length of the trigger probe portion 82 in the Z direction.

[0071] The protrusion 84 is a portion that protrudes from the stem 11 (surface 11a) into the internal space S. The protrusion 84 has a shape that approaches the protrusions 54 and 64 as it approaches the surface 11a in the Z direction. In this embodiment, the protrusion 84 has a hemispherical shape. Specifically, the protrusion 84 is a portion of the trigger probe portion 82 other than the embedded portion 83. The length L4 of the protrusion 84 in the Z direction is the amount of protrusion of the protrusion 84 from the surface 11a in the Z direction. The length L4 is smaller than the length L1 and the length L2. The length L4 may be the same as the length L1 and the length L2.

[0072] Of the conductive linear member 18, only the protruding portion 84 is exposed to the internal space S. The boundary between the embedded portion 83 and the protruding portion 84 is located above the center of the trigger probe portion 82. The boundary between the embedded portion 83 and the protruding portion 84 is located on the surface 11a, and its entire circumference is in close contact with the surface 11a of the stem 11 with no gap. This causes the gap between the trigger probe portion 82 and the stem 11 to be airtightly sealed.

[0073] The protrusion 54, the protrusion 64, the protrusion 74, and the protrusion 84 are arranged in the X direction in the order of the protrusion 74, the protrusion 54, the protrusion 84, and the protrusion 64. In other words, the protrusion 84 is disposed between the protrusion 54 and the protrusion 64 in the X direction. Since the protrusion 84 has a semispherical shape, it approaches the protrusion 54 and the protrusion 64, respectively, as it approaches the surface 11a of the stem 11. Therefore, at the boundary between the embedded portion 83 and the protrusion 84 (the portion where the protrusion 84 contacts the surface 11a), the protrusion 84 is closest to the protrusion 54 and the protrusion 64.

[0074] Next, the operation of the flash lamp 1A will be described. First, a predetermined voltage is applied between the protrusions 54 and 64 by a main power supply (not shown) electrically connected to the lead portions 51 and 61. In this state, a pulse voltage is applied to the cathode 52, the anode 62, the sparker portion 72, and the trigger probe portion 82 by a trigger power supply (not shown) electrically connected to the lead portions 51, 61, 71, and 81.

[0075] Application of such a voltage first causes a discharge in the sparker portion 72, which emits ultraviolet light (UV light). This UV light emission causes photoelectrons to be emitted from the protrusions 54, 64, and 84, ionizing the discharge gas in the internal space S. Then, following the discharge by the sparker portion 72, a preliminary discharge occurs between the protrusions 54 and 84, and between the protrusions 84 and 64. Then, a main discharge (arc discharge) occurs between the protrusions 54 and 64 via the same path as the preliminary discharge. This causes the flash lamp 1A to emit pulsed light.

[0076] In the flash lamp 1A described above, the configuration common to the flash lamp 1 achieves the same effects as the flash lamp 1. Furthermore, in the flash lamp 1A, the protrusion 84 is disposed between the protrusions 54 and 64 in the X direction. In this case, preliminary discharges occur between the protrusions 54 and 84, and between the protrusions 84 and 64, respectively, and main discharges occur between the protrusions 54 and 64 via the same discharge path as the preliminary discharge. As a result, the discharge path is stabilized, making it possible to stabilize the light output.

[0077] Length L4 is equal to or less than length L1 and length L2. In this case, fluctuations in the discharge path in the Z direction can be suppressed when discharging between protrusion 54 and protrusion 84. Similarly, fluctuations in the discharge path in the Z direction can be suppressed when discharging between protrusion 64 and protrusion 84. As a result, the discharge path is stabilized, and the light output can be stabilized.

[0078] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments.

[0079] In flash lamps 1 and 1A, conductive linear members 15 do not have to be integrally molded members. That is, lead portion 51 and cathode 52 may be separate members and fixed in place during the manufacturing process of flash lamp 1. Similarly, conductive linear members 16, 17, and 18 do not have to be integrally molded members.

[0080] In the flash lamp 1A, one or more other conductive linear members having trigger probe portions may be further provided depending on the distance D1. For example, as the distance D1 increases, the number of conductive linear members having trigger probe portions provided between the protrusions 54 and 64 increases. This makes it possible to generate a preliminary discharge using a plurality of trigger probe portions even if the distance D1 increases, thereby stabilizing the discharge path.

[0081] In the flash lamp 1, the cathode 52, the anode 62, and the sparker portion 72 all have a spherical shape, but the shapes of the cathode 52, the anode 62, and the sparker portion 72 are not limited to a spherical shape. For example, as shown in (a) of FIG. 8, the cathode 52, the anode 62, and the sparker portion 72 may have a conical shape. In this case, too, the cathode 52 is a rotating body centered on the axis of the conductive linear member 15, the anode 62 is a rotating body centered on the axis of the conductive linear member 16, and the sparker portion 72 is a rotating body centered on the axis of the conductive linear member 17. Therefore, regardless of the angle of the rotation direction centered on the axis of the conductive linear member 15, the distance in the X direction between the cathode 52 and the anode 62 and the distance in the X direction between the cathode 52 and the sparker portion 72 are constant. Therefore, the conductive linear member 15 can be fixed to the stem 11 without considering the angle of the rotation direction about the axis of the conductive linear member 15. Similarly, the conductive linear member 16 can be fixed to the stem 11 without considering the angle of the rotation direction about the axis of the conductive linear member 16. The conductive linear member 17 can be fixed to the stem 11 without considering the angle of the rotation direction about the axis of the conductive linear member 17. This makes it possible to simplify the arrangement of the cathode 52, the anode 62, and the sparker portion 72.

[0082] As shown in (b) of FIG. 8 and (c) of FIG. 8, the cathode 52, the anode 62, and the sparker portion 72 may have a rectangular flat plate shape. The cathode 52, the anode 62, and the sparker portion 72 may be arranged in the X direction such that one corner of the cathode 52 faces one corner of the anode 62, and another corner of the cathode 52 faces one corner of the sparker portion 72. In this configuration, a discharge path is formed between the corners facing each other in the X direction, so that fluctuations in the Y direction of the discharge path can be suppressed. As a result, the discharge path is stabilized, and the light output can be stabilized.

[0083] In the flash lamp 1, the shapes of the cathode 52, the anode 62, and the sparker portion 72 are the same (spherical), but may be different. For example, as shown in Fig. 9(a), the shapes of the cathode 52 and the anode 62 may be the same, and the shape of the sparker portion 72 may be different from the shapes of the cathode 52 and the anode 62. In the example shown in Fig. 9(a), the shapes of the cathode 52 and the anode 62 are spherical, and the shape of the sparker portion 72 is conical.

[0084] As shown in Fig. 9(b), the shapes of the cathode 52, the anode 62, and the sparker portion 72 may be different from each other. In the example shown in Fig. 9(b), the cathode 52 has a rectangular plate shape, the anode 62 has a spherical shape, and the sparker portion 72 has a conical shape. Any shape may be adopted as the shape of the cathode 52, the anode 62, and the sparker portion 72.

[0085] Similarly, in the flash lamp 1A, the shapes of the cathode 52, anode 62, sparker portion 72, and trigger probe portion 82 are the same (spherical), but may be different. As shown in Fig. 10, the shapes of the cathode 52 and anode 62 may be the same, and the shapes of the sparker portion 72 and trigger probe portion 82 may be different from the shapes of the cathode 52 and anode 62. In the example shown in Fig. 10, the shapes of the cathode 52 and anode 62 are spherical, and the shapes of the sparker portion 72 and trigger probe portion 82 are conical.

[0086] Furthermore, the shapes of the cathode 52, the anode 62, the sparker portion 72, and the trigger probe portion 82 may be different from each other. Three electrode portions among the cathode 52, the anode 62, the sparker portion 72, and the trigger probe portion 82 may have the same shape, and the remaining electrode portion may have a different shape. Two electrode portions among the cathode 52, the anode 62, the sparker portion 72, and the trigger probe portion 82 may have the same shape, one electrode portion may have a shape different from the shapes of the two electrode portions, and the remaining electrode portion may have yet another shape.

[0087] The flash lamp 1, 1A may not include the conductive linear member 17. The bulb 10 may be configured to define the internal space S, and for example, the stem 11 and the side tube 12 may be different members and joined together. Furthermore, the side tube 12 is not limited to being made of an insulating material, and may be made of a conductive material, such as a metal. Furthermore, the side tube 12 and the face plate 13 may be directly fused together, and the joining member 14 may not be included.

[0088] In the flash lamps 1 and 1A, the term "spherical" means that the shape is substantially spherical, and is not limited to a strict hemispherical shape, and may be a shape that is deformed within a range that can be recognized as a sphere. Similarly, the term "hemispherical" means that the shape is substantially hemispherical, and is not limited to a strict hemispherical shape, and may be a shape that is deformed within a range that can be recognized as a hemispherical shape. In addition, the embedded portion 53 and the protruding portion 54 have a hemispherical shape, but the shapes of the embedded portion 53 and the protruding portion 54 are not limited to this. For example, the center of the cathode 52 may be included in the embedded portion 53. That is, more than half of the length of the cathode 52 in the Z direction may be the embedded portion 53, and the remainder may be the protruding portion 54. The center of the cathode 52 may be included in the protruding portion 54. That is, more than half of the length of the cathode 52 in the Z direction may be the protruding portion 54, and the remainder may be the embedded portion 53. The same applies to the anode 62, the sparker portion 72, and the trigger probe portion 82.

[0089] In the flash lamp 1, 1A, the stem 11 may have a protruding portion that protrudes into the internal space S from the surface 11a. The embedded portion 53 may be embedded in the protruding portion. The above configuration is formed, for example, during the manufacture of the flash lamp 1, 1A, by solidifying the stem 11 in a state in which the molten stem 11 creeps up to surround the lower portion of the cathode 52 located directly above the surface 11a (the portion corresponding to the embedded portion 53). Similarly, each of the embedded portions 63, 73, 83 may be embedded in the protruding portion of the stem 11.

[0090] In the flash lamps 1, 1A, the lengths L1 and L2 may be greater than the length in the Z direction of the discharge path formed between the protrusions 54 and 64. In this case, deterioration of the cathode 52 and the anode 62 due to discharge can be suppressed. The lengths L1 and L2 may be the same as the length in the Z direction of the discharge path. In this case, it is possible to suppress fluctuation of the discharge path in the Z direction while suppressing deterioration of the cathode 52 and the anode 62 due to discharge.

[0091] As shown in FIG. 11, in the flash lamp 1, before the conductive linear members 15-17 are attached to the main body 10B, the stem 11 may be provided with through holes 11c, 11d, and 11e penetrating the stem 11 in the Z direction. In the example shown in FIG. 11, the through hole 11c includes a recess 11h for accommodating the embedded portion 53. The through hole 11d includes a recess 11i for accommodating the embedded portion 63. The through hole 11e includes a recess 11j for accommodating the embedded portion 73. Each of the recesses 11h, 11i, and 11j is recessed from the surface 11a toward the surface 11b. The recesses 11h, 11i, and 11j have shapes corresponding to the embedded portions 53, 63, and 73, respectively.

[0092] In the above configuration, with the lead portion 51 inserted into the through hole 11c and the embedded portion 53 fitted into the recess 11h, the conductive linear member 15 is fused to the stem 11, thereby hermetically sealing the through hole 11c. Similarly, with the lead portion 61 inserted into the through hole 11d and the embedded portion 63 fitted into the recess 11i, the conductive linear member 16 is fused to the stem 11, thereby hermetically sealing the through hole 11d. Similarly, with the lead portion 71 inserted into the through hole 11e and the embedded portion 73 fitted into the recess 11j, the conductive linear member 17 is fused to the stem 11, thereby hermetically sealing the through hole 11e.

[0093] Similarly, in the flash lamp 1A, before the conductive linear members 15-18 are attached to the main body 10B, in addition to the through holes 11c, 11d, and 11e, a through hole for inserting the conductive linear member 18 may be provided in the stem 11 in advance. [Explanation of symbols]

[0094] 1, 1A... flash lamp, 10... bulb (housing), 11... stem, 11a... surface (first surface), 11b... surface (second surface), 15... conductive linear member (first conductive linear member), 16... conductive linear member (second conductive linear member), 17... conductive linear member (third conductive linear member), 18... conductive linear member (fourth conductive linear member), 51... lead portion (first lead portion), 52... cathode (first electrode portion), 53...embedded portion (first embedded portion), 54...protruding portion (first protruding portion), 61...lead portion (second lead portion), 62...anode (second electrode portion), 63...embedded portion (second embedded portion), 64...protruding portion (second protruding portion), 71...lead portion (third lead portion), 72...sparker portion, 74...protruding portion (third protruding portion), 81...lead portion (fourth lead portion), 82...trigger probe portion, 84...protruding portion (fourth protruding portion).

Claims

1. a housing having a stem and defining an internal space in which a discharge gas is sealed; a first conductive linear member extending through the stem in a first direction; a second conductive linear member extending through the stem in the first direction and spaced apart from the first conductive linear member in a second direction intersecting the first direction; Equipped with the first conductive linear member includes a first lead portion and a first electrode portion provided at a tip of the first lead portion, the second conductive linear member includes a second lead portion and a second electrode portion provided at a tip of the second lead portion, a cross-sectional area of ​​the first electrode portion intersecting the first direction is different from a cross-sectional area of ​​the first lead portion intersecting the first direction, a cross-sectional area of ​​the second electrode portion intersecting the first direction is different from a cross-sectional area of ​​the second lead portion intersecting the first direction, the first electrode portion includes a first protruding portion protruding from the stem into the internal space, and a first embedded portion connected to a tip of the first lead portion and embedded in the stem, the second electrode portion includes a second protruding portion protruding from the stem into the internal space, and a second embedded portion connected to a tip of the second lead portion and embedded in the stem, the first lead portion and the second lead portion are not in contact with the discharge gas; Flash lamp.

2. a housing having a stem and defining an interior space; a first conductive linear member extending through the stem in a first direction; a second conductive linear member extending through the stem in the first direction and spaced apart from the first conductive linear member in a second direction intersecting the first direction; Equipped with the first conductive linear member includes a first lead portion and a first electrode portion provided at a tip of the first lead portion, the second conductive linear member includes a second lead portion and a second electrode portion provided at a tip of the second lead portion, a cross-sectional area of ​​the first electrode portion intersecting the first direction is different from a cross-sectional area of ​​the first lead portion intersecting the first direction, a cross-sectional area of ​​the second electrode portion intersecting the first direction is different from a cross-sectional area of ​​the second lead portion intersecting the first direction, the first electrode portion includes a first protruding portion protruding from the stem into the internal space, and a first embedded portion connected to a tip of the first lead portion and embedded in the stem, the second electrode portion includes a second protruding portion protruding from the stem into the internal space, and a second embedded portion connected to a tip of the second lead portion and embedded in the stem, The stem has a first surface facing the internal space and a second surface opposite to the first surface in the first direction, A flash lamp, wherein the distance between the first protrusion and the second protrusion in the second direction is shortest on the first surface.

3. The flash lamp according to claim 2 , wherein the first protrusion has a shape that approaches the second protrusion as it approaches the first surface.

4. The flash lamp according to claim 3 , wherein the second protrusion has a shape that approaches the first protrusion as it approaches the first surface.

5. 5. The flash lamp according to claim 3, wherein the first electrode portion has a spherical shape.

6. 5. The flash lamp according to claim 3, wherein the first electrode portion has a conical shape.

7. a length of the first projection in the first direction is equal to or less than a length of a discharge path generated between the first projection and the second projection in the first direction; 7. The flash lamp according to claim 1, wherein the length of the second protrusion in the first direction is equal to or less than the length of the discharge path in the first direction.

8. a housing having a stem and defining an interior space; a first conductive linear member extending through the stem in a first direction; a second conductive linear member extending through the stem in the first direction and spaced apart from the first conductive linear member in a second direction intersecting the first direction; Equipped with the first conductive linear member includes a first lead portion and a first electrode portion provided at a tip of the first lead portion, the second conductive linear member includes a second lead portion and a second electrode portion provided at a tip of the second lead portion, a cross-sectional area of ​​the first electrode portion intersecting the first direction is different from a cross-sectional area of ​​the first lead portion intersecting the first direction, a cross-sectional area of ​​the second electrode portion intersecting the first direction is different from a cross-sectional area of ​​the second lead portion intersecting the first direction, the first electrode portion includes a first protruding portion protruding from the stem into the internal space, and a first embedded portion connected to a tip of the first lead portion and embedded in the stem, the second electrode portion includes a second protruding portion protruding from the stem into the internal space, and a second embedded portion connected to a tip of the second lead portion and embedded in the stem, a length of the first projection in the first direction is equal to or less than a length of a discharge path generated between the first projection and the second projection in the first direction; A flash lamp, wherein the length of the second protrusion in the first direction is equal to or less than the length of the discharge path in the first direction.

9. a third conductive linear member extending through the stem in the first direction; The third conductive linear member includes a third lead portion and a sparker portion provided at a tip of the third lead portion, The sparker portion includes a third protruding portion protruding from the stem into the internal space, The first electrode portion is a cathode portion and the second electrode portion is an anode portion, 9. The flash lamp according to claim 1, wherein the first protrusion is disposed between the second protrusion and the third protrusion in the second direction.

10. 10. The flash lamp according to claim 9, wherein a distance between the first protrusion and the third protrusion in the second direction is shorter than a distance between the first protrusion and the second protrusion in the second direction.

11. a fourth conductive linear member extending through the stem in the first direction; the fourth conductive linear member includes a fourth lead portion and a trigger probe portion provided at a tip of the fourth lead portion, the trigger probe portion includes a fourth protruding portion protruding from the stem into the internal space, 11. The flash lamp according to claim 1, wherein the fourth protrusion is disposed between the first protrusion and the second protrusion in the second direction.

12. 12. The flash lamp according to claim 11, wherein a length of the fourth protrusion in the first direction is equal to or less than a length of the first protrusion in the first direction and a length of the second protrusion in the first direction.

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