JP5180265B2 - Metal vapor discharge lamp and lighting device - Google Patents

Description

  The present invention relates to a metal vapor discharge lamp and a lighting device, and more particularly to a technique for suppressing the inclination of an inner tube with respect to a base in a metal halide lamp having a triple tube structure.

Conventionally, there has been a metal halide lamp having a triple tube structure in which an inner tube in which a discharge tube is accommodated is further covered with an outer tube. In Patent Document 1, as shown in FIG. 12, in a metal halide lamp 900 having a triple tube structure (hereinafter simply referred to as “lamp 900”), in order to suppress the inclination of the outer tube 902 with respect to the inner tube 901, that is, the inner tube. in order to match the tube axis _{Z 1} of 901 and the tube axis _{Z 2} of the outer tube 902, be provided with a regulating member 903 in the gap between the inner tube 901 and outer tube 902 has been proposed. In assembling the lamp 900, first, the inner tube 901 is fixed to the base 904 using cement 905, and then the outer tube 902 is put on the inner tube 901. Since Z ₂ coincides with the tube axis Z ₁ of the inner tube 901, the outer tube 902 is fixed to the base 904 using cement 906 in this state.

Utility Model Registration No. 3144888

However, when the lamp 900 is assembled, the inner tube 901 may be fixed while being tilted with respect to the base 904. That is, the tube axis Z ₁ of the inner tube 901 may be inclined with respect to the center axis Z _{3 of the} base 904.

With such tube axis Z ₁ of the inner tube 901 is inclined, the light center O of the discharge tube 907 accommodated in the inner tube 901, shifted from inclined amount corresponding ideal optical center position, the lamp 900 When attached to a luminaire (not shown), the light distribution characteristics deteriorate.

Further, when the tube axis Z ₁ of the inner tube 901 is inclined with respect to the central axis Z _{3 of the} base 904, the tube axis Z ₂ of the outer tube 902 is also moved to the central axis Z ₃ of the base 904 by the action of the regulating member 903. It leans against it. A mismatch between the central axis Z ₃ of the tube axis Z ₂ and the base 904 of such outer tube 902 occurs when the rotating mounting the cap 904 to the socket (not shown) of the lighting fixture, with the outer tube 902 be rotated lamp 900 to the tube axis Z ₂ around, because the mouthpiece 904 is not rotated about axis Z ₃ around, operability at the time of lamp mounting is reduced.

  In view of the above problems, an object of the present invention is to provide a metal vapor discharge lamp and an illuminating device in which the tube axis of the inner tube is not easily inclined with respect to the central axis of the base.

In order to achieve the above object, a metal vapor discharge lamp according to the present invention is a metal vapor discharge lamp in which an inner tube having a discharge tube disposed therein is accommodated in a space surrounded by a base and an outer tube. A pair of lead wires, one end of which is electrically connected to the discharge tube and the other end of which is electrically connected to the base, are sealed at the end of the inner tube on the base side . The tube is supported by the base side end portion so that the posture can be freely changed with respect to the base only by the pair of introduction lines , and the tube is supported with respect to the outer tube by a regulating member interposed between the inner surface of the outer tube. Attitude is regulated.

  The illumination device according to the present invention includes the metal vapor discharge lamp and a reflecting mirror that reflects light emitted from the metal vapor discharge lamp in a desired direction.

  In the metal vapor discharge lamp and the lighting device according to the present invention, since the inner tube is supported so that the posture can be freely changed with respect to the base, the posture of the outer tube with respect to the base is optimized without being restricted by the posture of the inner tube. can do. In this way, when the outer tube is attached in an appropriate posture, the posture of the inner tube is optimized via the restricting member, so that the tube axis of the inner tube is not easily inclined with respect to the central axis of the base.

The partially broken side view which shows the illuminating device which concerns on 1 aspect of this invention The partially broken side view which shows the metal vapor discharge lamp which concerns on 1 aspect of this invention Sectional drawing which shows the discharge tube of the metal vapor discharge lamp which concerns on 1 aspect of this invention The perspective view which shows the control member which concerns on 1 aspect of this invention AA line sectional view in FIG. Partially broken side view showing a metal vapor discharge lamp according to Modification 1 Sectional drawing for demonstrating the metal vapor discharge lamp which concerns on the modification 2. Sectional drawing for demonstrating the metal vapor discharge lamp which concerns on the modification 3. Sectional drawing for demonstrating the control member of the metal vapor discharge lamp which concerns on the modification 4. Sectional drawing for demonstrating the control member of the metal vapor discharge lamp which concerns on the modification 4. Sectional drawing for demonstrating the control member of the metal vapor discharge lamp which concerns on the modification 5. Partially cutaway side view showing a conventional metal vapor discharge lamp

  Hereinafter, a metal vapor discharge lamp and a lighting device according to the present embodiment will be described with reference to the drawings. In addition, the scale of the member in each drawing differs from an actual thing. In the present invention, the sign “˜” indicating a numerical range includes numerical values at both ends.

[Lighting device]
FIG. 1 is a partially cutaway side view illustrating a lighting device according to one embodiment of the present invention. As shown in FIG. 1, an illuminating device 1 according to one embodiment of the present invention is a spotlight illuminating device, and includes a metal vapor discharge lamp 10 (hereinafter simply referred to as “lamp 10”) and the lamp 10 disposed therein. Lighting fixture 20 is provided. The lighting device according to the present invention is not limited to a spotlight lighting device, and may be a lighting device for other purposes.

The lamp 10 includes a discharge tube 100, an inner tube 200, an outer tube 300, a base 400, and a regulating member 500. Details of the lamp 10 will be described later.
The luminaire 20 includes a reflecting mirror 22 having a concave reflecting surface 21 that reflects light emitted from the lamp 10 forward, a lamp mounting socket 23 incorporated in the reflecting mirror 22, and a wall or ceiling. And an attachment 24 for attaching the reflecting mirror 22.

The reflecting mirror 22 is in an open state because the light extraction opening 25 provided on the front surface is not blocked by a cover such as a glass plate.
The socket 23 is electrically connected to a lighting device (not shown) embedded in a wall or ceiling via a supply line 26, and if the base 400 of the lamp 10 is inserted into the socket 23, the lamp 10 is connected to the lamp 10. Can be supplied with power.

  The attachment 24 has an arm 27 that is rotatably attached to a wall or ceiling, and a reflecting mirror 22 is pivotally attached to the tip of the arm 27. The direction of light emitted from the illumination device 1 can be adjusted by rotating the arm 27 or the reflecting mirror 22.

[Metal vapor discharge lamp]
FIG. 2 is a partially broken side view showing a metal vapor discharge lamp according to one embodiment of the present invention. As shown in FIG. 2, the lamp 10 is a metal halide lamp having a triple tube structure in which an inner tube 200 having a discharge tube 100 disposed therein is accommodated in a space surrounded by a base 400 and an outer tube 300. The inner tube 200 is supported at the base side end so that the posture of the inner tube 200 can be freely changed, and the posture of the inner tube 200 with respect to the outer tube 300 is controlled by a restriction member 500 interposed between the inner tube 200 and the inner surface of the outer tube 300. It is regulated. 2 has a bottomed cylindrical shape having an opening 301 at one end and a closed portion 302 at the other end, the outer tube according to the present invention has a structure surrounding the inner tube 200. As long as this is the case, for example, a structure in which a cap made of a metal material is disposed on the end of the outer tube 300 opposite to the opening 301 may be used. In the present application, “supporting the inner tube 200 so that the posture can be freely changed” means a region where the position of the inner tube 200 is included in a space surrounded by the outer tube 300 and the base 400, and the inner tube 200. This means that it is movable by elastic deformation of at least one member that supports the inner tube 200, and it does not matter whether or not there is a contact point between the inner tube 200 and the base end.

  FIG. 3 is a cross-sectional view illustrating a discharge tube of a metal vapor discharge lamp according to an aspect of the present invention. As shown in FIG. 3, the discharge tube 100 includes a main tube portion 102 having a discharge space 101 hermetically sealed therein, and a tube axis (the center in the longitudinal direction of the lamp 10) of the discharge tube 100 from the main tube portion 102. The narrow tube portions 103 and 104 formed so as to extend on both sides in the direction (which coincides with the lamp axis X, which is the shaft), and the joint portions 105 and 106 that fill the gap between the main tube portion 102 and the thin tube portions 103 and 104. And an envelope 107 composed of

  The envelope 107 is made of alumina ceramic, for example. The envelope 107 is not limited to the one formed of alumina ceramic, and may be formed of other translucent ceramic (for example, rare earth alumina garnet ceramic), quartz glass, or the like. In the drawing, the discharge tube 100 is a shrink-fit type formed by joining the main tube portion 102, the thin tube portions 103 and 104, and the joint portions 105 and 106, but the main tube portion 102, the thin tube portions 103 and 104, and An integrated type in which the joint portions 105 and 106 are integrally formed may be used. Further, the main pipe portion 102 may be formed by joining a plurality of members.

  The discharge space 101 is filled with a predetermined amount of a metal halide that is a luminescent material, a rare gas that is a starting auxiliary gas, and mercury that is a buffer gas. Examples of the metal halide include sodium iodide, dysprosium iodide, holmium iodide, thulium iodide, thallium iodide, cerium iodide, calcium iodide, lithium iodide, indium iodide, and scandium iodide. It is done. The metal halide is appropriately determined depending on the emission color.

  The discharge tube 100 has a pair of electrodes 108 and 109 whose distal ends are opposed to each other in the discharge space 101 of the main tube portion 102 and whose proximal ends are inserted into the narrow tube portions 103 and 104. The intermediate position between the tips of the electrodes 108 and 109 is the optical center O of the discharge tube 100.

  The electrodes 108 and 109 have electrode rods 110 and 111 and electrode coils 112 and 113 provided at the tip portions (end portions on the side facing each other in the discharge space 101) of the electrode rods 110 and 111. The other end portions of the electrodes 108 and 109 are joined to one end portions of the power feeders 114 and 115 in the thin tube portions 103 and 104, and the power feeders 114 and 115 are formed from the frit poured into the thin tube portions 103 and 104. It is sealed by the sealing materials 116 and 117.

Returning to FIG. 2, the power feeders 114 and 115 are electrically connected to the base 400 via the power supply lines 118 and 119, the metal foils 120 and 121, and the introduction lines 122 and 123.
One power supply line 118 is covered with a sleeve 128 made of, for example, quartz glass at a portion facing the other power supply line 119 and the power supply body 115 connected to the power supply line 119. With such a configuration, even if a leak occurs in the discharge tube 100 at the end of the lamp life, there is an effect of suppressing an unexpected large current from continuing to flow due to a discharge generated between members having opposite polarities. As a result, it is possible to prevent problems such as damage to the lighting device.

  The lead-in wires 122 and 123 are one of the members that support the inner tube 200. For example, the first external lead wires 124 and 125 made of molybdenum and having a diameter of 0.7 [mm], and the lead wires 122 and 123 made of nickel and having a diameter of 0.1 mm. 6 [mm] second external lead wires 126, 127 are welded and joined, and the first external lead wires 124, 125 are connected to the metal foils 120, 121, and the second external lead wires 126, 127 is connected to the base 400. Since metal wires such as nickel are easily elastically deformed, workability such as connection between the lead wire and the base and alignment of the optical center O is improved.

  The material of the first external lead wires 124 and 125 and the second external lead wires 126 and 127 is a conductive material having elasticity such as metal, and the diameter of the two lead wires is the outer tube 300 and the base 400. As long as they are housed in a space surrounded by and are not short-circuited to each other, they are not limited to the above and are optional. However, in order to support the inner tube 200 so that the posture can be freely changed, the diameters of the first external lead wires 124 and 125 are preferably 0.5 [mm] to 1.0 [mm], and the second external lead The diameters of the wires 126 and 127 are preferably 0.4 [mm] to 1.0 [mm].

  The inner tube 200 is, for example, a single-sealed airtight container including a sealing portion 201, a tip portion 202, and an intermediate portion 204. The sealing part 201 is formed by, for example, crushing sealing by a pinch seal method, and constitutes the base side end of the inner tube 200. The sealing portion 201 includes one end of the power supply lines 118 and 119, the entire metal foils 120 and 121, one end of the first external lead wires 124 and 125 (that is, one end of the introduction wires 122 and 123), Is sealed. The distal end portion 202 constitutes an end portion on the opposite side of the base 400 of the inner tube 200, and faces the closing portion 302 of the outer tube 300.

  The tip portion 202 has a tip-off portion 203 that is the remaining portion of the exhaust pipe used when evacuating the inside of the inner pipe 200. By evacuating the inner tube 200, metal members such as the power feeders 114 and 115 and the power supply lines 118 and 119 can be prevented from being exposed to high temperatures and being oxidized. It should be noted that the metal member can be prevented from being oxidized by filling the inner tube 200 with an inert gas such as nitrogen instead of evacuating the inner tube 200.

  When the tip portion 202 is substantially hemispherical, the intermediate portion 204 has an outer diameter of 13 [mm] to 17 [mm] and a wall thickness of 1 [mm] to 2 [mm]. In the inner tube 200, the intermediate portion 204 has, for example, a substantially cylindrical shape, and the envelope 107 of the discharge tube 100 is disposed in the intermediate portion 204. Note that the shape of the intermediate portion 204 is not limited to a substantially cylindrical shape, and may be a cylinder other than a cylinder, such as a polygonal or elliptical cylinder. Further, the inner diameter and the outer diameter of the intermediate portion 204 are not necessarily uniform along the tube axis direction of the inner tube. For example, the inner diameter and the outer diameter at a position corresponding to the main tube portion 102 of the discharge tube 100 are other than that. It may be a shape that is larger than the inner diameter and the outer diameter of the position, that is, a middle-bulged shape having a bulging portion in part. Thereby, it can suppress that the temperature of the discharge tube 100 rises excessively.

  The inner tube 200 is made of, for example, quartz glass. The inner tube 200 is not limited to the one formed of quartz glass, and may be formed of a translucent ceramic such as alumina ceramic, hard glass, or the like.

  The outer tube 300 has a bottomed cylindrical shape including an opening (neck portion) 301, a closing portion 302, and an intermediate portion 303 between the opening 301 and the closing portion 302. When the inner tube 200 is damaged by the rupture, it plays a role of preventing the fragments generated by the rupture or damage from being scattered. Therefore, even if the opening 25 as shown in FIG. 1 is used for the lighting fixture 20 that is not covered with the cover, fragments are not scattered. Note that the closed portion 302 is preferably substantially hemispherical or flat. Moreover, it is not always necessary to close with the same member. For example, another member such as metal or ceramic may be used.

  In order to ensure the compactness of the lamp 10, it is preferable that the intermediate portion 303 has a substantially cylindrical shape that is the same as the intermediate portion 204 of the inner tube 200. In addition, the gap between the inner surface of the intermediate portion 303 of the outer tube 300 and the outer surface of the intermediate portion 204 of the inner tube 200 is substantially uniform in a direction orthogonal to the tube axis of the outer tube 300 (which coincides with the lamp axis X). Preferably there is. In order to ensure clearance when the outer tube 300 is put on the inner tube 200 in the assembly process, it is preferable that the gap is designed to be 1 [mm] to 3 [mm] on average.

  The shape of the intermediate portion 303 is not limited to a substantially cylindrical shape, and may be a cylinder other than a cylinder such as a polygonal or elliptical cylinder. Further, the inner diameter and the outer diameter of the intermediate portion 303 do not necessarily have to be uniform along the outer tube axis direction. For example, the inner diameter and the outer diameter at a position corresponding to the main tube portion 102 of the discharge tube 100 are other than that. A shape that is larger than the inner diameter and outer diameter of the position, that is, a middle-bulged shape having a bulged portion in part. By reducing the temperature rise of the outer tube due to the heat from the discharge tube by providing the bulging portion, it is possible to widen the selection range of the suitable lighting fixture 20 with a margin from the strain point of the hard glass. . Furthermore, the safety when the discharge tube is broken is also improved. In that case, it is preferable that the gap is designed to be 5 [mm] at the maximum.

  Furthermore, in order to prevent the outer tube 300 from falling, an inner convex portion may be provided in the vicinity of the opening 301, and a groove-shaped engaged portion may be provided in the base 400, for example. In that case, the case where it connects via connection members, such as cement, may be sufficient. Moreover, when the to-be-engaged part is not provided in the nozzle | cap | die 400, you may engage by covering the inner side convex part of the outer tube | pipe 300 with a connection member.

  The outer tube 300 is made of hard glass, for example. The outer tube 300 is not limited to the one made of hard glass, and may be made of a translucent ceramic such as alumina ceramic, quartz glass, or the like.

With regard to instrument adaptation, the outer tube 300 preferably has a neck outer diameter of 23 [mm] or less and a maximum outer diameter of 27 [mm] or less near the sealing portion 201.
The outer tube 300 is fixed to the base 400 using a fixing agent (not shown) such as cement. The inside of the outer tube 300 may be in an atmospheric state in which the inside and the outside of the outer tube 300 communicate with each other via a vent hole 403 of the base 400 described later, or the pressure is reduced by closing the vent hole 403. It may be filled with an inert gas. The maximum outer diameter of the outer tube intermediate portion 303 is 20 [mm] to 27 [mm], the neck outer diameter is 20 [mm] to 23 [mm], and the thickness of the outer tube intermediate portion is 1 [mm] to 2 [mm]. ] Is more preferable.

  The base 400 is attached to the opening 301 in a state in which the discharge tube side end is accommodated in the opening 301 of the outer tube 300, that is, the outer tube is connected to the discharge tube side end of the base 400. The inner surface of the opening 301 of 300 is preferably circumscribed. With such a configuration, it is possible to visually confirm that the opening 301 is joined to the base 400 without floating in the step of fixing the outer tube 300 to the base 400. Furthermore, since it is not necessary to make the opening diameter of the neck part of the reflecting mirror 22 of the lighting fixture 20 larger than necessary, the reflection efficiency of the lighting fixture 20 can be improved.

The base 400 is an Edison type base, and has a shell portion 401 and an eyelet portion 402. One second external lead 126 passes through a vent hole 403 provided in the base 400, is led out to the outside, and is fixed to the base 400 by being joined to the shell portion 401. Here, the vent hole 403 may penetrate the space formed between the outer tube 300 and the inner tube 200 and the outside. Accordingly, moisture released when hardening the cement used for fixing the outer tube 300 and the base 400, for example, when the lamp is manufactured can be released to the outside, and the inside of the outer tube 300 is pressurized when the lamp is lit. There is no.
The other second external lead wire 127 is fixed to the base 400 by passing through a through hole 404 provided in the base 400 and joining to the eyelet part 402. Note that the base 400 is a part that constitutes a part necessary for electrical connection, such as the shell part 401 and the eyelet part 402, a part that constitutes a part that holds the outer pipe, a part that constitutes a part that supports the inner pipe, etc. It may consist of two or more parts. These parts may be fixed by, for example, an adhesive.

  The inner pipe 200 is separated from the base 400 within the outer pipe 300 (floating in the air) by lead-in wires 122 and 123 having one end sealed by the sealing portion 201 of the inner pipe 200 and the other end fixed to the base 400. The gap 11 of 4 [mm] at the maximum exists between the sealing part 201 of the inner tube 200 and the base 400. Here, the gap 11 between the sealing portion 201 and the base 400 means the gap 11 between the bottom surface of the sealing portion 201 and the base 400 in the lamp axis X direction. As will be described later in Modification 1, when the base 400 is composed of two or more components, the gap between the bottom surface of the sealing portion 201 of the inner tube 200 and the components existing in the lamp axis X direction. As in the above, it is sufficient that the gap is 4 [mm] at maximum in a separated state (floating in the air).

  In the example illustrated in FIG. 2, the entire sealing portion 201 of the inner tube 200 is accommodated in the outer tube 300, but a part or the entirety of the sealing portion 201 may be accommodated in the base 400. Even in that case, it is conceivable to provide the gap 11 between the sealing portion 201 and the base 400.

  Since the gap 11 is provided between the sealing portion 201 and the base 400, the position of the inner tube 200 is not restricted by the base 400 until the lead-in wires 122 and 123 are fixed to the base 400. It can be moved along the X direction. Therefore, the lead-in wires 122 and 123 are temporarily fixed to the base 400, and the outer tube 300 is fixed to the base 400, and then the lead-in lines 122 and 123 are operated so that the position of the inner pipe 200 is set in the lamp axis X direction. And the position of the optical center O can be adjusted.

  The regulating member 500 is made of an elastic material such as stainless steel, and is disposed outside the distal end portion 202 of the inner tube 200 and inside the closing portion 302 of the outer tube 300, and surrounds the inner tube 200. An annular portion 510 and an arch portion 520 straddling the distal end portion 202 of the inner tube 200 are included.

  FIG. 4 is a perspective view illustrating a regulating member according to one aspect of the present invention. As shown in FIG. 4, the annular portion 510 is, for example, a member obtained by bending or bending a long plate-like member into an annular shape (for example, an octagonal annular shape) having a diameter smaller than the outer diameter of the inner tube 200. When the inner tube 200 is inserted into the annular portion 510, the distance between the end portions 511 and 512 increases with the insertion, and the tube axis of the inner tube 200 (which coincides with the lamp axis X, The annular portion 510 expands in the radial direction centering on “the tube axis X of the inner tube”).

  For example, the regulating member 500 is inserted into the outer tube 300 in advance before the outer tube 300 is put on the inner tube 200. When the inner tube 200 is covered with the outer tube 300, the annular portion 510 increases in diameter as the inner tube 200 is inserted, and the outer surface 513 of the annular portion 510 contacts the inner surface 304 of the outer tube 300.

FIG. 5 is a cross-sectional view taken along line AA in FIG. 2, and members housed in the inner tube 200 are omitted. As shown in FIG. 5, in an assembled state of the lamp 10, the outer surface 513 of the annular portion 510 is in contact with the inner surface 304 of the outer tube 300 at eight contacts P _{1 to} P ₈ . That is, the maximum outer diameter of the regulating member 500 is equal to the inner diameter of the outer tube 300 in a state where the regulating member 500 is housed in the outer tube 300. Further, the inner surface 514 of the annular portion 510 is in contact with the outer surface 205 of the inner tube 200 at eight contact points P _{9 to} P ₁₆ .

  Since the regulating member 500 is in contact with the outer tube 300 and the inner tube 200 in this way, the posture of the outer tube 300 affects the posture of the inner tube 200 via the regulating member 500, and the posture of the inner tube 200 is corrected. The Since the inner tube 200 is supported by the lead wires 122 and 123 so that the posture of the lamp 10 is freely changeable with respect to the base 400, the regulating member 500 can be used if the posture of the outer tube 300 is appropriate with respect to the base 400. As a result, the posture of the inner tube 200 is also appropriate. That is, if the tube axis of the outer tube 300 and the center axis of the base 400 are matched, the tube axis of the inner tube 200 and the center axis of the base 400 are matched.

Further, _eight contacts P _{1 to} P ₈ between the regulating member 500 and the outer tube 300 are formed at equal intervals in the circumferential direction, and the contacts P _{9 to} P ₁₆ between the regulating member 500 and the inner tube 200 are also circumferential. In other words, the gaps between the outer tube 300 and the inner tube 200 are easily maintained uniformly along the circumferential direction. The contacts P _{1 to} P ₈ between the restricting member 500 and the outer tube 300 and the contacts P _{9 to} P ₁₆ between the restricting member 500 and the inner tube 200 do not necessarily have to be eight places, respectively. It is not necessary to be equally spaced along the circumferential direction.

However, when viewed from the tube axis X direction of the inner tube, an imaginary line that connects two of the contact points of the regulating member 500 and the outer tube 300 and passes through at least a part of the inner tube 200 is a pair of introduction lines 122 and 123. It is preferable that it intersects with a virtual line V ₁ connecting the portions sealed in the sealing portion 201 within a range of 45 [°] to 135 [°] (in the example shown in FIG. 5, P ₁ a virtual line connecting the _{P 3} (not shown), a virtual line connecting the _{P 1} and _{P 4} (not shown), a virtual line connecting the _{P 1} and _{P 5} (not shown), and _{P 1} and _{P 6} A virtual line (not shown) connecting P ₂ and P ₄ , a virtual line (not shown) connecting P ₂ and P ₅ , a virtual line connecting P ₃ and P ₈ (not shown) shown), a virtual line connecting the _{P 4} and _{P 7} (not shown), a virtual line connecting the _{P 3} and _{P 8} (not shown), a virtual line connecting the _{P 5} and _{P 7} (not shown) , A virtual line (not shown) connecting P ₅ and P ₈ and a virtual line (not shown) connecting P ₅ and P ₈ are within the range of 45 degrees to 135 degrees with the virtual line V ₁ , respectively. Crossed.) This is because the inner tube 200 supported by the pair of lead-in wires 122 and 123 is likely to be inclined in a direction substantially perpendicular to the virtual line V ₁ , so that the contacts are located along the direction and on both sides of the inner tube 200. This is because the inclination of the inner tube 200 can be effectively suppressed by designing to do so. Incidentally, the angle of the virtual line V ₁ and the virtual line connecting the two points of contact between the regulating member 500 and the inner pipe 200 is 60 [°] or 120 [°] or less, more preferably in the range, approximately 90 [° It is even more preferable that

In particular, when an imaginary line that connects two points of the contact points of the regulating member 500 and the outer tube 300 and passes through at least a part of the inner tube 200 passes between the pair of introduction lines 122 and 123 (see FIG. 5). in the example shown, a virtual line connecting the _{P 1} and _{P 4} (not shown), a virtual line connecting the _{P 1} and _{P 5} (not shown), a virtual line connecting the _{P 4} and _{P 8} (not shown), and , P ₅ and P ₈ , a virtual line (not shown) intersects the virtual line V ₁ within a range of 45 ° to 135 °, and further intersects the tube axis X of the inner tube 200. The inclination of the inner tube 200 can be suppressed in a well-balanced manner.

Furthermore, when an imaginary line that connects two of the contact points of the regulating member 500 and the outer tube 300 and passes through at least a part of the inner tube 200 intersects the tube axis X of the inner tube (example shown in FIG. 5). Then, a virtual line (not shown) connecting P ₁ and P ₅ and a virtual line (not shown) connecting P ₄ and P ₈ are 45 [°] or more and 135 [°] or less with the virtual lines V ₁ . ) And further intersects with the tube axis X of the inner tube), and the inclination of the inner tube 200 can be suppressed with a better balance.

When the number of contacts between the regulating member 500 and the outer tube 300 is larger, the posture of the inner tube 200 is more stable, but when the number is small, for example, when the number of contacts is three, the regulating member 500 and the outer tube 300 are stable. An imaginary line V ₁ that connects two portions of the contact with 300 and passes through at least a part of the inner tube 200 connects a portion sealed in the sealing portion 201 of the pair of introduction lines 122 and 123. And the angle of rotation of the contact point adjacent to each other in the circumferential direction is 90 [°] or more to stabilize the posture of the inner tube 200. Therefore, it is preferable. Further, it is more preferable that the rotation angle α is the same between the contact points adjacent in the circumferential direction.

  Note that the regulating member 500 does not necessarily need to be in contact with the inner tube 200, and may be in contact with only the outer tube 300. That is, there may be no contact between the regulating member 500 and the inner pipe 200. For example, when the restricting member 500 and the inner tube 200 are in contact with each other only when the inner tube 200 is inclined more than a certain amount with respect to the base 400, the inner tube 200 is inclined when the inclination of the inner tube 200 is within an allowable range. Therefore, there is a case where there is no contact between the regulating member 500 and the inner pipe 200.

  Further, the regulating member 500 may not necessarily be in contact with the outer tube 300 but may be in contact with only the inner tube 200. That is, the maximum outer diameter of the restricting member 500 is smaller than the inner diameter of the outer tube 300, and therefore there may be no contact with the restricting member 500 outer tube 300. For example, when the regulating member 500 is attached to the inner tube 200 first and the outer tube 300 is covered later, if the inclination of the inner tube 200 is within an allowable range, the regulating member 500 does not contact the outer tube 300. Thus, in the case where the restricting member 500 and the outer tube 300 are in contact with each other only when the inclination of the inner tube 200 is outside the allowable range and the posture of the inner tube 200 is corrected, the inclination of the inner tube 200 is allowed. When it is within the range, it is not necessary to correct the inclination, and there may be no contact between the regulating member 500 and the outer tube 300.

  Returning to FIG. 4, the arch portion 520 is a pair of extending portions that are formed by bending or bending a long plate-like member extending in the annular portion 510 in an arch shape and extending in the lamp axis X direction. 521, 522, a pair of inclined portions 523, 524 that incline so as to approach the lamp axis X from the end opposite to the annular portion 510 in each of the extended portions 521, 522, and extended portions in the pair of inclined portions 523, 524 521 and 522 and a flat portion 525 located between the opposite ends. Note that one extending portion 522 of the arch portion 520 is only in contact with or close to the annular portion 510 and is not joined to the annular portion 510.

  The lengths and the like of the extending portions 521 and 522 and the inclined portions 523 and 524 are determined so that the flat portion 525 is at a predetermined position in the outer tube 300. Specifically, as shown in FIG. 2, when the inner tube 200 is inserted into the outer tube 300, the extended portion of the arch portion 520 so that the distal end portion 202 of the inner tube 200 is positioned in the annular portion 510. The lengths of 521 and 522 and the inclined portions 523 and 524 are adjusted.

  The flat portion 525 of the arch portion 520 is disposed outside the distal end portion 202 of the inner tube 200 and inside the closed portion 302 of the outer tube 300, and prevents the outer tube 300 from being damaged when the discharge tube 100 is ruptured. Have When the discharge tube 100 is ruptured, the vicinity of the discharge tube of the inner tube 200 is cracked, and the distal end portion 202 of the inner tube 200 may blow off toward the closed portion 302 of the outer tube 300, but the distal end portion 202 is caused by the flat portion 525. Since the collision with the closed portion 302 is prevented, the outer tube 300 can be prevented from being damaged.

  The restriction member according to the present invention may be configured to support the inner tube 200 (including the tip-off portion 203) and abut against the inner surface 304 of the outer tube 300 by a plurality of claws. In that case, only the tip-off portion 203 of the inner tube 200 may be supported by the restriction member. In this configuration, for example, by bringing the claw of the regulating member 500 into contact with the inner surface of the outer tube 300, the frictional force and stress from the outer tube are transmitted to the distal end portion 202 of the inner tube 200 when the discharge tube 100 is ruptured. The speed at which the distal end portion 202 of the 200 blows and collides with the closed portion 302 of the outer tube 300 can be attenuated.

  When the inner tube 901 is fixed to the base 904 with cement 905 as in the conventional lamp 900 shown in FIG. 11, once the inner tube 901 is attached in a posture inclined with respect to the base 904, the posture is changed. Since this cannot be corrected, this causes a decrease in yield. However, in the lamp 10, the inner tube 200 is not fixed to the base 400, and the inner tube 200 is supported at the end of the base side so that the posture of the base 400 can be changed. The posture with respect to the outer tube 300 can be corrected by the restriction member 500 inserted between the two.

  Further, the conventional lamp 900 for fixing the inner tube 200 to the base 400 with the cement 905 requires a material cost for the cement 905, and the process of applying the cement 905 and the drying of the cement 905 are performed when the lamp is assembled. Since the process is necessary, the assembling work is complicated and takes time to assemble. Furthermore, the introduction lines 122 and 123 may be corroded by moisture generated when the cement 905 is dried. However, in the case of the lamp 10, since the inner tube 200 is not fixed to the base 400 with cement, such a problem does not occur.

  Returning to FIG. 2, for example, when the tube axis X of the inner tube 200 is tilted as indicated by a virtual line Y, the tilt angle β of the tube axis X of the inner tube 200 with respect to the central axis of the base 400 is 1.0 [ When the angle exceeds [°], the deviation between the optical center O of the lamp 10 and the focal point of the reflecting surface 21 of the lighting fixture 20 becomes significant, and the light distribution characteristics deteriorate when the lighting fixture 20 is mounted. Moreover, since the outer tube 300 appears to be inclined in appearance, the lamp 10 having a poor appearance as a product is obtained. Therefore, the inclination angle β is preferably 1.0 [°] or less.

In order to set the inclination angle β to 1.0 [°] or less, the maximum outer diameter of the regulating member 500 is R ₁ (see FIG. 5), the inner diameter of the outer tube 300 is R ₂ (also see FIG. 5), The position from the position of the maximum outer diameter of the regulating member 500 (the position closest to the base 400 when the position of the maximum outer diameter has a width in the tube axis X direction of the inner pipe) to the tip of the sealing portion 201 of the inner pipe 200 When the distance in the direction along the tube axis X of the tube is L, R ₂ = R ₁ in a state where the regulating member 500 is housed in the outer tube 300 or R ₂ −R ₁ > 0 In addition, it is preferable that the condition of 2L / (R ₂ −R ₁ ) ≧ 58 is satisfied. This is based on the fact that cot (1 °) = 57.28..., And if at least one of the above conditions is satisfied, the inclination angle β is kept within about 1.0 [°]. Can do.

[Modification]
As described above, the metal vapor discharge lamp and the lighting device according to the present invention have been specifically described based on the embodiments. However, the metal vapor discharge lamp and the lighting device according to the present invention are not limited to the above embodiments. Needless to say.

  Hereinafter, modifications will be described, but only differences from the lamp 10 according to the above embodiment will be basically described, and the same points as the lamp 10 will not be described in order to avoid duplication. The same members as those of the lamp 10 are denoted by the same reference numerals.

(Modification 1)
In the metal vapor discharge lamp according to the present invention, the base is not limited to the Edison type. FIG. 6 is a partially broken side view showing a metal vapor discharge lamp according to the first modification. As shown in FIG. 6, the lamp 600 according to the first modification is greatly different from the lamp 10 according to the above-described embodiment in that the base is a swan type.

  The lamp 600 according to the first modification has a swan type cap 601. The base 601 includes a main body 602 to which the opening 301 of the outer tube 300 is attached, and a pair of two-stage pins 603 and 604 that are implanted in the main body 602. In the first modification, the introduction wires 122 and 123 are constituted only by molybdenum external lead wires, and one end portions of the introduction wires 122 and 123 are joined to the metal foils 120 and 121 in the sealing portion 201 of the inner tube 200. Has been. On the other hand, the other end portions of the lead-in wires 122 and 123 penetrate the main body portion 602 and are inserted into the two-stage pins 603 and 604, and the two-stage pins 603 and 604 are electrically and mechanically connected to the caulking portions 605 and 606. Connected.

  When the base 601 is of the swan type as described above, the lead wires 122 and 123 can be configured only by an external lead wire made of molybdenum having a rigidity higher than that of nickel (having a large Young's modulus). , 123 can be made substantially straight without bending, so that the inner tube 200 can be supported in a more stable state so that the posture can be freely changed. The lead wires 122 and 123 have a diameter of 0.5 mm to 1.0 [mm] so that the inner tube 200 can be stably supported and can be elastically deformed to such an extent that the posture of the inner tube 200 can be corrected. mm].

  In addition, there are two or more caps such as a part constituting a part necessary for electrical connection such as a shell part and an eyelet part, a part constituting a part for holding an outer pipe, and a part constituting a part for supporting an inner pipe. It may consist of parts. These parts may be fixed by, for example, an adhesive.

(Modification 2)
In the metal vapor discharge lamp according to the present invention, a member may be interposed in the gap 11 between the sealing portion 201 of the inner tube 200 and the base 400 as long as the posture change of the inner tube 200 is allowed. FIG. 7 is a cross-sectional view for explaining a mercury vapor discharge lamp according to Modification 2. For example, in the example shown in FIG. 7, a support member 607 made of a heat-resistant and insulating sponge made of rock wool or the like is interposed in the gap 11. Although the support member 607 is weak, it can be elastically deformed, and stably supports the inner tube 200 while allowing the posture of the inner tube 200 to be changed. With such a configuration, the inner tube 200 can be separated from the base 601 even when the inner tube 200 cannot be supported by the introduction wires 122 and 123 alone because the diameters of the introduction wires 122 and 123 are small. .

  The support member 607 is formed with holes 608 and 609 through which the introduction lines 122 and 123 pass, and the introduction lines 122 and 123 pass through the holes 608 and 609. Since the support member 607 has insulation properties, the lead wires 122 and 123 can be more reliably insulated from each other.

  The support member 607 is not limited to a sponge, and may be any member that can support the inner tube 200 in a posture-deformable manner without firmly holding the inner tube 200 to the base. For example, elastic members such as clips and springs are conceivable. However, when these members are made of a conductive member such as a metal, attention must be paid to the arrangement with the introduction lines 122 and 123. That is, since a high voltage pulse is applied to the lead-in lines 122 and 123 at the time of starting the lamp, the insulation distance of the lead-in lines 122 and 123 that are between different poles is appropriately maintained when they are in the vicinity thereof. Therefore, it can be conceived that the starting performance is deteriorated, the abnormal discharge continues between the lead-in lines, and the base is damaged. In order to avoid such a problem, when the sealing portion 201 of the inner tube 200 is supported by the conductive member, it may be installed without straddling the lead wires 122 and 123.

(Modification 3)
In the metal vapor discharge lamp according to the present invention, the sealing portion of the inner tube is not necessarily separated from the base. FIG. 8 is a cross-sectional view for explaining a mercury vapor discharge lamp according to Modification 3. For example, in the example shown in FIG. 8, a wall portion 705 is provided on the inner tube 200 side of the base 700, and the inner tube 200 side surface of the wall portion 705 is, for example, a substantially conical shape for supporting the inner tube 200. A projecting portion 706 is provided. The sealing portion 201 of the inner tube 200 is placed on the protruding portion 706, and the protruding portion 706 and the sealing portion 201 are in substantially point contact.

  With such a configuration, the inner tube 200 can be supported by the wall portion 705 as a fulcrum and the posture of the inner tube 200 can be changed by elastic deformation of the lead-in wires 122 and 123, and the inner tube 200 moves toward the base 400 side. Can also be regulated. Further, even when the inner pipe 200 cannot be supported only by the introduction lines 122 and 123 because the diameters of the introduction lines 122 and 123 are small, the inner pipe 200 can be supported.

  Holes 707 and 708 for penetrating the introduction wires 122 and 123 are formed in the wall 705. One lead-in wire 122 passes through the hole portion 707, further passes through the vent hole 703 of the base 700, is led out to the outside, and is fixed to the base 700 by being joined to the shell portion 701. The other lead-in wire 123 is fixed to the base 700 by passing through the hole 708 and further through the through-hole 704 of the base 700 and joining to the eyelet part 702.

(Modification 4)
In the metal vapor discharge lamp according to the present invention, the shape and position of the regulating member are not limited to the above embodiment. 9 and 10 are diagrams for explaining a regulating member of the metal vapor discharge lamp according to the modification 4. In the example shown in FIG. 9, the regulating member 800 is configured only by a member corresponding to the annular portion 510 of the regulating member 500 according to the present embodiment. In such a case, the regulating member 800 may be arranged at a position closer to the optical center O. However, the angle γ formed between the imaginary line W connecting the optical center O and the optical center side outer peripheral edge 801 of the regulating member 800 and the tube axis X of the inner tube is 0 [°] to 40 [°] or 140 [°] to 180 [°] is preferable. This is because the light emitted from the discharge tube 100 is less likely to be blocked by the regulating member 800 within these ranges, and shadows are unlikely to occur on the irradiated surface. In addition, since a shadow will arise notably when the width | variety of the control member 800 will be 0.5 [mm] or more, in that case, it is more necessary to make angle (gamma) 40 degrees or less.

  Furthermore, as shown in FIG. 10, even when the outer diameter of the regulating member 804 is not constant in the tube axis X direction of the inner tube, an imaginary line W connecting the optical center O and the optical center side outer peripheral edge 805 of the regulating member 804. And the tube axis X of the inner tube are preferably 40 [°] or less for the same reason.

  Further, not only when the shape of the restricting member is uniform in the circumferential direction as shown in FIGS. 9 and 10, but also with a nail having a contact point with respect to the outer tube when the inner tube is inclined with respect to the outer tube. If the width of the nail is 0.5 [mm] or more, the irradiation surface is shaded. Similarly, the virtual line W connecting the optical center O and the nail tip 806 of the regulating member 804 and the inner tube The angle γ formed by the axis X needs to be 40 [°] or less for the same reason.

(Modification 5)
FIG. 11 is a cross-sectional view for explaining a regulating member of a metal vapor discharge lamp according to Modification 5. As a further modification of the regulating member according to the present invention, as shown in FIG. 11, a regulating member 910 produced by bending one metal wire into a coil shape may be used. The regulating member 910 includes a first coil portion 911 (annular portion) wound around the outer surface 205 of the inner tube 200, a closed portion 302 of the outer tube 300, and a distal end portion of the inner tube 200 so that the tip-off portion 203 is accommodated therein. 202 includes a second coil part 912 disposed between the first coil part 912 and the connecting part 913 that connects the first coil part 911 and the second coil part 912. One end of the second coil portion 912 is in contact with the closing portion 302 of the outer tube 300, and the other end is in contact with the distal end portion 202 of the inner tube 200. When the discharge tube 100 is ruptured, the second coil 712 is spring-operated. Since the speed at which the tip 202 collides with the closing part 302 can be attenuated, the breakage of the closing part 302 of the outer tube 300 can be suppressed.

(Other)
The configuration of each modification is not limited to the contents described for each modification, and each combination can be selected as appropriate.

  INDUSTRIAL APPLICABILITY The present invention can be used for a metal vapor discharge lamp having a discharge tube, an inner tube, and an outer tube, particularly a low-wattage and compact triple-tube structure with power consumption of 100 W or less.

DESCRIPTION OF SYMBOLS 1 Illuminating device 10 Metal vapor discharge lamp 100 Discharge tube 108, 109 Electrode 108a, 109a End part 122, 123 Lead-in line 200 Inner tube 201 Base side end 205 Outer surface 300 Outer tube 400 Base 500, 800, 802, 804 Restriction member 801 , 803, 805 Electrode tip side outer periphery

Claims (6)

An inner tube in which a discharge tube is arranged is a metal vapor discharge lamp accommodated in a space surrounded by a base and an outer tube,
One end of the inner tube is electrically connected to the discharge tube and the other end of the inner tube is sealed with a pair of lead wires electrically connected to the cap.
The inner tube is supported at the base side end portion so that the posture of the inner tube can be freely changed with respect to the base only by the pair of introduction lines , and the outer tube is controlled by a regulating member interposed between the inner surface of the outer tube. A metal vapor discharge lamp characterized in that the attitude to the tube is regulated.   The metal discharge lamp according to claim 1, wherein the inner tube is in a state in which the end portion on the base side is separated from the base. The regulating member has a plurality of contacts that contact the inner surface of the outer tube, and an imaginary line that connects two of the contacts and passes through at least a part of the inner tube in the tube axis X direction of the inner tube. 3. The metal vapor discharge according to claim 1, wherein the metal vapor discharge intersects with an imaginary line connecting portions of the pair of lead-in wires in the sealing portion within a range of 45 ° to 135 °. lamp. The maximum outer diameter of the restricting member and R _1, the inner diameter of the outer tube and R _2, the tube axis X of the inner tube from the position of the maximum outer diameter of the restricting member to the tip of the mouthpiece end of the inner tube Where L is the distance in the direction along
R ₂ -R ₁ = 0, or R ₂ -R ₁ > 0 and 2L / (R ₂ -R ₁ ) ≧ 58,
Metal vapor discharge lamp according to any one of claims 1 to 3, characterized in satisfying the condition of. The discharge tube has a pair of electrodes, and an angle formed by an imaginary line connecting a tip portion of the electrode closer to the regulating member and an outer peripheral edge on the electrode tip portion side of the regulating member, and a tube axis X of the inner tube The metal vapor discharge lamp according to any one of claims 1 to 4 , wherein is less than 40 [°]. A metal vapor discharge lamp according to any one of claims 1 to 5, the illumination device characterized in that it comprises a light emitted from the metal vapor discharge lamp reflector for reflecting a desired direction.

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