JP2012048878A - Metal vapor discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a metal vapor discharge lamp that suppresses a decrease of emitted luminous flux while securing safety in the case of breakage of a discharge tube.SOLUTION: The lamp is constituted by housing an inner tube, housing the discharge tube with a pair of electrodes inside, in an outer tube, and has a ferrule on one end side of the outer tube. The outer tube includes a glass-made cylindrical body and a lid body closing an opening at the other end of the cylindrical body, and the lid body is made of a material having less brittleness than the cylindrical body, and an included angle X that a segment, connecting an edge of the lid body on one end side of the cylindrical body and a tip of an electrode positioned on the lid side to each other, and the center axis of the discharge tube contain satisfies a relation of 11[°]≤X≤57[°].

Description

  The present invention relates to a metal vapor discharge lamp including a discharge tube, an inner tube, and an outer tube.

A high-intensity, high-efficiency, long-life metal vapor discharge lamp, such as a metal halide lamp (hereinafter simply referred to as “lamp”), is used in various places taking advantage of its characteristics.
In addition to the lamp, the conventional lighting device using the lamp as a light source includes a reflecting plate that has a concave reflecting surface and reflects light emitted from the lamp in a desired direction. For example, it is blocked by a front glass plate (a so-called closed type lighting device). The reason for closing the light extraction port is to prevent the fragments from being scattered outside the apparatus when the lamp (discharge tube) is damaged for some reason.

  On the other hand, in places where space design and cost are important, such as commercial facilities such as stores, there is a demand for a so-called open type lighting device in which the light extraction port of a conventional lighting device is not covered with a front glass. Yes. As a lamp that meets such demands, for example, a structure in which an inner tube that accommodates a discharge tube is further covered with an outer tube, that is, a triple-tube structure such as a discharge tube, an inner tube, and an outer tube, is Proposals have been made so that even if a tube breaks, the fragments remain in the outer tube.

  Furthermore, in recent years, as an outer tube, a tube-shaped tubular body and a lid body that closes the opening at the other end of the tubular body, and a metal material used for the lid body have been proposed. (For example, patent document 1).

Patent No. 4436428

  Even if the inner tube is broken due to breakage of the discharge tube, the lid body closes the other end of the cylindrical body so that the fragments remain in the outer tube, but is made of a metal material, The light emitted from the discharge tube is shielded by the lid. In other words, although measures against damage can be taken, there arises a problem that light is shielded by the lid and the luminous flux decreases.

  An object of this invention is to provide the metal vapor discharge lamp which can suppress the fall of emitted light beam, ensuring the safety at the time of discharge tube failure.

  In order to achieve the above object, a metal vapor discharge lamp according to the present invention includes an inner tube that houses a discharge tube having a pair of electrodes inside, and a cap is provided at one end of the outer tube. The outer tube has a glass cylindrical body and a lid that closes the other end opening of the cylindrical body, the position on the edge of the lid and the pair of Of the electrodes, the largest angle among the angles between the line segment connecting the tip of the electrode located on the lid side and the central axis of the discharge tube is defined as the included angle X, and the included angle X is 11 [°. ] ≦ X ≦ 57 [°].

  Alternatively, the metal vapor discharge lamp according to the present invention is a metal vapor discharge lamp in which an inner tube that houses a discharge tube having a pair of electrodes is housed in an outer tube, and a cap is provided at one end of the outer tube. The outer tube includes a glass cylindrical body and a lid that closes the other end opening of the cylindrical body, and faces the tip of the electrode located on the lid side of the pair of electrodes. When the solid angle formed by the lid is ω, the solid angle ω satisfies the relationship of 0.12 [sr] ≦ ω ≦ 2.86 [sr].

  Further, the lid body is fixed to the cylindrical body with an inorganic adhesive, or the lid body is an engaging portion that engages with the other end portion of the cylindrical body. It is characterized by having.

  In the metal vapor discharge lamp according to the present invention, the lid body has the included angle X or the solid angle ω in the above range, so that a high luminous flux and a high insertion / extraction property are ensured while ensuring safety when the discharge tube is broken. Can do.

It is a general view of the illuminating device which concerns on embodiment, and a part is notched so that the inside of a reflecting plate can be understood. It is the front view which notched some lamps concerning an embodiment. It is front sectional drawing of a discharge tube. It is a figure explaining the positional relationship of a cover body and a discharge tube. The figure which shows the test result about emitted light beam is shown. (A) is a partially cutaway perspective view showing a modified example 1 of the lid fixing method, and (b) is a partially cutaway perspective view showing a modified example 2 of the lid fixed method. is there. (A) is a partially cutaway perspective view showing the other end of the outer tube according to Modification 3, and (b) is a partially cutaway perspective showing the other end of the outer tube according to Modification 4. FIG. (A) is a partially cutaway perspective view showing the other end portion of the outer tube according to the modified example 5, and (b) is a partially cutaway perspective view showing the other end portion of the outer tube according to the modified example 6. FIG. FIG. 12 is a partially cutaway perspective view showing the other end of the outer tube according to Modification 7. It is a figure which shows the outer tube | pipe which concerns on the modification 8, (a) is a partially notched perspective view which shows an other end side, (b) is sectional drawing. 10 is a partially cutaway perspective view showing a lid according to Modification 9. FIG. (A) is a partially cutaway perspective view showing a lid body according to Modification Example 10, (b) is a partially cutaway perspective view showing a lid body according to Modification Example 11, and (c) is a perspective view. FIG. 14 is a partially cutaway perspective view showing a lid according to Modification 12. (A) is a partially cutaway perspective view showing a lid body according to Modification Example 13, and (b) is a partially cutaway perspective view showing a lid body according to Modification Example 14. (A) is sectional drawing of the other end part of the outer tube | pipe which concerns on the modification 15, (b) is sectional drawing of the other end part of the outer tube | pipe which concerns on the modification 16. FIG. It is a figure which shows the lamp | ramp using the outer tube | pipe which concerns on the modification 17. FIG. It is a figure which shows the nozzle | cap | die part of the lamp | ramp using the nozzle | cap | die which concerns on the modification 18. FIG. It is a figure explaining the calculation method of the included angle X when there exists a notch part. It is a figure explaining the calculation method of the included angle X when there exists a notch part and the extension part is curving. It is a figure explaining the calculation method of the included angle X when a cover body fits in the other end opening of a cylindrical body.

Hereinafter, an illumination device according to an embodiment of the present invention and a lamp used as a light source of the illumination device will be described with reference to the drawings.
1. Illumination Device FIG. 1 is an overall view of the illumination device according to the present embodiment, and is partially cut away so that the inside of the reflector can be seen.

  As shown in FIG. 1, the lighting device 10 includes a lighting fixture 12 and a lamp 14 attached to the lighting fixture 12. Although the said illuminating device 10 here is for spotlights, the lamp | ramp and illuminating device which concern on this invention may be used for another use.

  The luminaire 12 includes a reflection plate 16 that reflects light emitted from a lamp 14 disposed therein, a socket (not shown) that is incorporated in the reflection plate 16 and to which the lamp 14 is attached, and the reflection plate 16. And an attachment tool 18 for attaching to the wall or ceiling.

  As shown in the figure, the reflecting plate 16 includes a concave reflecting surface 20. The reflecting surface 20 is configured by using an aluminum mirror, for example. The reflection plate 16 is a so-called (front) open type in which the opening (light extraction port) 22 is not blocked by a glass plate or the like.

  The socket is electrically connected to the base of the lamp 14 and supplies power to the lamp 14. Note that a ballast (not shown) for lighting the lamp 14 is embedded in the ceiling, for example, and supplies power to the lamp 14 via a supply line 24 described later.

The attachment 18 has, for example, a “U” shape, and a pair of arms 26 (26) arranged in parallel and a connecting portion (one connecting the ends of the pair of arms 26 (26) ( The reflection plate 16 is pivotally supported by the arms 26 (26) in a state where the reflection plate 16 is sandwiched between the pair of arms 26 (26). For example, it can be mounted on a wall or ceiling. In addition, the direction of the light radiated | emitted from the illuminating device 10 can be adjusted by rotating the attachment 18 which can rotate with respect to the reflecting plate 16. FIG.
2. Lamp FIG. 2 is a front view of the lamp 14 according to the embodiment.

  The lamp 14 has a pair of electrodes therein, and forms a discharge space, a discharge tube 30, an inner tube 32 that is an airtight container for housing the discharge tube 30, and a protection covering the inner tube 32. It has a triple tube structure including an outer tube 34 that is a container, and further includes a base 36 for receiving power from a socket of the lighting fixture 12.

FIG. 3 is a front sectional view of the discharge tube 30.
The discharge tube 30 includes a main tube portion 40 for forming a discharge space 38 therein, narrow tube portions 42 a and 42 b formed so as to extend on both sides in the tube axis direction of the main tube portion 40, and a main tube portion 40. And an envelope 46 composed of coupling portions 44a and 44b for coupling the thin tube portions 42a and 42b.

  As can be seen from FIG. 3, the main pipe part 40 and the thin pipe parts 42 a and 42 b are tubular (here, the cross-sectional shape is circular), and the dimensions of the main pipe part 40 in the direction perpendicular to the pipe axis. (Herein, the inner diameter and the outer diameter) are larger than the dimensions (inner diameter / outer diameter) of the narrow tube portions 42a and 42b, and the coupling portion so as to fill the gap between the main tube portion 40 and the narrow tube portions 42a and 42b. The dimensions of 44a and 44b are determined.

  The main pipe portion 40, the thin tube portions 42a and 42b, and the coupling portions 44a and 44b are made of, for example, a translucent ceramic. As the translucent ceramic, for example, an alumina ceramic can be used. In addition, you may comprise with another ceramic or quartz glass.

  In the present embodiment, the envelope 46 is integrated by firing or the like in a state where the main pipe portion 40, the thin tube portions 42a and 42b, and the coupling portions 44a and 44b are separately formed and combined.

  Note that the envelope 46 is not limited to one obtained by firing and integrating three members, and for example, a main body portion and two narrow tube portions formed integrally from the beginning may be used. Moreover, you may use what the main pipe part is formed with a some member.

  The main tube portion 40 is a pair of substantially opposing each other on the central axis in the longitudinal direction of the lamp 14 (hereinafter, also simply referred to as “lamp axis”) or on an axis parallel to the lamp axis within the discharge space 38. The electrodes 48 and 50 are provided.

  The discharge space 38 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.

As shown in FIG. 3, the electrodes 48 and 50 include electrode rods 52 and 54 and electrode coils 56 and 58 provided at end portions on the distal end side (discharge space 38 side) of the electrode rods 52 and 54. Yes.
Although not used in the present embodiment, a molybdenum coil for suppressing penetration of the luminescent material into the gap is provided in the gap between the electrode bars 52 and 54 and the thin tube portions 42 and 42b. 54 may be wound.

  Ideally (designed), the electrodes 48 and 50 are arranged so as to face each other on the lamp axis, that is, the central axes of the electrode bars 52 and 54 are arranged on the lamp axis. However, in practice, the central axis may not be on the ramp axis due to the accuracy of the process.

  In each of the thin tube portions 42a and 42b, power feeding bodies 60 and 62 in which the respective electrodes 48 and 50 are joined to the distal end portion (the end portion opposite to the discharge space 38) are inserted. The power feeding bodies 60 and 62 are constituted by internal power feeding lines 64a and 64b and external power feeding lines 66a and 66b. The internal power supply lines 64a and 64b and the external power supply lines 66a and 66b are coupled by welding, for example.

  The power feeding bodies 60 and 62 are sealed by sealing materials 68a and 68b made of frit poured into the end portions of the respective narrow tube portions 42a and 42b opposite to the main tube portion 40. The portions of the sealing materials 68a and 68b that appear in FIG. 2 are portions that protrude from the end portions of the thin tube portions 42a and 42b.

Returning to the description of the lamp 14.
As shown in FIG. 2, the end of the power supply body 66a opposite to the side where the electrode 48 is provided is electrically connected to the power supply line 72. Similarly, the end of the power supply body 66b is opposite to the side where the electrode 50 is provided. The side end is electrically connected to the power supply line 74. The power supply lines 72 and 74 are connected to the lead wires 80 and 79 through metal foils 78 and 77.

  The lead wire 79 is connected to the shell portion 82 of the base 36 through a metal wire 81, and the lead wire 80 is connected to the eyelet portion 84 of the base 36 through a metal wire 83. Here, when nickel is used as the metal wires 81 and 83, for example, the metal wires are soft, so that workability such as connection between the lead wires 79 and 80 and the base 36 and optical center alignment is improved. The base 36 here is an Edison type, and is hereinafter also referred to as “E base”.

  In the power supply line 74, a portion corresponding to the base 36 side, for example, a portion facing the other power supply line 72 or the power supply body 66a connected to the power supply line 72 is, for example, a sleeve 76 made of quartz glass. It is covered with. With such a configuration, even if a leak occurs in the discharge tube 30 at the end of the lamp life, a lighting device (so-called stable operation) that occurs when an unexpectedly large current continues to flow due to discharge generated between members having opposite polarities. And other problems such as damage to the circuit, etc.).

  As shown in FIG. 2, the discharge tube 30 and the like described above are accommodated in an inner tube 32 having a cylindrical shape, for example, a cylindrical shape. The inner tube 32 is made of, for example, quartz glass, and the end portion on the side where the metal foils 78 and 80 exist is crushed by a so-called pinch seal method and hermetically sealed at portions corresponding to the metal foils 78 and 80. .

Therefore, it can be said that the inner tube 32 is a single-sealed airtight container. Here, the crush-sealed portion of the inner tube 32 is referred to as a pinch seal portion 86.
The convex portion 90 at the tip of the other end of the inner tube 32 is a tip-off portion that is the remaining portion of the exhaust tube used when evacuating the inner tube 32. The reason why the inside of the inner tube 32 is evacuated is to prevent oxidation of the power feeding bodies 66a and 66b, the power supply lines 72 and 74, and the like that are exposed to high temperatures when the lamp is turned on. From the viewpoint of preventing oxidation, the inside of the inner tube 32 (and thus the outside of the discharge tube 30) can be filled with an inert gas such as nitrogen instead of being evacuated.

The end on the base 36 side is a pinch seal portion 86, and the end opposite to the base 36 (the lamp top side) is a tip (90) facing the lid 94 side portion of the outer tube 34. ing.
As shown in FIG. 2, the inner tube 32 is covered with an outer tube 34 having a bottomed tubular shape (that is, a tubular shape having one end opened and the other end closed). The outer tube 34 includes, for example, a cylindrical body 92 having a circular cross section and a lid body 94 that closes the other end of the cylindrical body 92. The lid body 94 is, for example, a bottomed cylinder comprising a cylinder portion 94a that abuts (externally fits) with the outer peripheral surface of the other end portion of the cylindrical body 92, and a lid portion 94b provided at the other end of the cylinder portion 94a. It has a shape.

  For compact type lamps, especially lamps with an outer tube diameter of 28 [mm] or less, the conventional triple tube type closed with a substantially hemispherical outer tube without a lid is replaced with a lamp from a lighting fixture for spotlight use etc. Therefore, when removing the lamp, there is a problem that it is difficult to remove the lamp by holding the tip of the outer tube. In the case of the lamp 14, the tube portion 94 a comes into contact with the outer peripheral surface of the other end portion of the tubular body 92, so that a step is generated on the base side of the tube portion 94 a, thereby easily pulling the lamp 14. Can be easily removed from.

  Further, when the shape of the lid viewed from the front end direction of the lamp 14 is a polygon, there are steps or irregularities on the side surface of the lid, or there are holes or vertical grooves during caulking in the locking structure. In this case, it is easy to rotate the lamp 14 in the direction of the circumference of the tube axis while holding the lid, and in the case of a lamp having an E base or a screw-type base such as a swan type to be described later, It can be easily removed.

  The cylindrical body 92 is made of, for example, hard glass, the lid 94 is made of a bottomed cylindrical metal material (for example, aluminum), and the lid 94 is an inorganic adhesive with respect to the cylindrical body 92. (Silicon adhesive) 96 is fixed.

  In general, since the metal material is less brittle than hard glass, the outer tube 34 is damaged even when the inner tube 32 is damaged by the breakage of the discharge tube 30 and the fragments are scattered in the tube axis direction. The distal end of the outer tube 34 (the end opposite to the base 36) does not reach destruction even when the lid 94 is deformed. It functions as a protective member that plays a role of preventing.

  The cylindrical body 92 has the same cylindrical shape as the inner tube 32, for example, a cylindrical shape, in order to ensure the compactness of the lamp, and in order to ensure a clearance when the outer tube 34 is put on the inner tube 32 in the assembly process. Further, the gap between the cylindrical body 92 (the straight portion of the outer tube 34) and the inner tube 32 is 1 [mm] to 3 [mm] on average.

  In addition to having the shell portion 82 and the eyelet portion 84 described above, the base 36 has a grip portion 98 (see FIG. 1) for gripping the pinch seal portion 86. The pinch seal portion 89 of the inner tube 32 is fixed by an adhesive while being inserted into the grip portion 98 of the base 36, and in this state, the periphery of the pinch seal portion 89 of the inner tube 32 and the outer tube 34 are bonded. It is fixed by the agent 99. Thereby, the base 36, the inner tube 32, and the outer tube 34 are coupled.

  Here, the adhesive is so-called “cement”, and is an inorganic adhesive (for example, Sumicelam (registered trademark) manufactured by Asahi Chemical Industry, Bond X (registered trademark) manufactured by Nissan Chemical Industries).

In the embodiment of the rated power 35 [W] type lamp, the power consumption is 39 [W], the arc length (the distance between the pair of electrodes 48 and 50) is 4.5 [mm], and the outer tube 34 The maximum outer diameter of the intermediate portion and the opening is 21 [mm], the maximum outer diameter of the intermediate portion and the opening of the inner tube 32 is 15 [mm], and the thickness of the intermediate portion and the opening of the outer tube 34 is 1.5. [Mm].
In the embodiment of the rated power 70 [W] type lamp, the power consumption is 73 [W], the arc length is 6.0 [mm], and the maximum outer diameter of the intermediate portion and the opening of the outer tube 34 is 22 [mm]. The maximum outer diameter of the intermediate portion and the opening of the inner tube 32 is 16 [mm], and the thickness of the intermediate portion and the opening of the outer tube 34 is 1.5 [mm].
3. Light shielding property by the lid The light emitted from the discharge tube 30 is shielded by the metal lid 94. In other words, the luminous flux of the lamp 14 is lower than that without the lid 94.

However, the high luminous flux of the lamp 14 can be maintained by optimizing the positional relationship between the lid 94 and the discharge tube 30 (more precisely, an electrode).
FIG. 4 is a diagram illustrating the positional relationship between the lid and the discharge tube.

  A line segment A1 connecting the edge 94c on the base 36 side of the lid 94 and the tip of the electrode 52 located on the lid 94 side (on the base 36 side) of the pair of electrodes 50 and 52, and a discharge tube The angle between the line segment A2 that coincides with the central axis of 30 is defined as the included angle X.

FIG. 5 is a diagram showing test results for the luminous flux.
In the test, lamps with different included angles X were manufactured, and the luminous flux was measured before and after the lid 94 was mounted, and the luminous flux ratio was calculated.

  Specifically, two types of lamps with power consumption P of 39 [W] and 73 [W] are used. A lamp with power consumption of 30 [W] to 45 [W] is a rated power of 35 [W] type, and a lamp with power consumption of 65 [W] to 80 [W] is a rated power of 70 [W] type. being classified.

  In the lamp with the power consumption P of 39 [W], the edge 94c on the cap 36 side of the lid 94 and the tip of the electrode 52 located on the lid 94 side of the pair of electrodes 50 and 52 (on the cap 36 side). The distance L in the lamp axis direction to 6.2 [mm] and the outer diameter D of the lid 94 is 16.5 [mm], 19.0 [mm], and 22.0 [mm]. I made a lamp. The included angle X at this time is 53 [°], 57 [°], 61 [°] as shown in FIG.

  In a lamp with a power consumption P of 73 [W], the distance L is 7.2 [mm], and the outer diameter D is 36.5 [mm], 22.0 [mm], 25.0 [mm]. Two lamps were made. The included angle X at this time is 49 [°], 57 [°], and 60 [°] as shown in FIG.

  As shown in FIG. 5, the luminous flux decreases due to the difference in the included angle X. When the included angle X is 57 [°] or less, the light flux ratio is 90 [%] or more with respect to the case without the lid (94). The included angle X is preferably 57 [°] or less for both the rated power 35 [W] type and 70 [W] type.

From the viewpoint of the luminous flux, it is better that the included angle X is small. However, in view of the work for attaching the lid 94 to the outer tube 34 at the time of manufacture, in either case of manual work or automatic assembling work, if the lid 94 is too small, the fitting work is difficult, which is serious. Has a problem that the lid 94 falls off. As a result of examining the reliability of the mounting operation of the lid body 94 in an actual process, the inventors can reliably mount the lid body 94 without dropping off if the included angle X is 11 ° or more. I found.
4). Dimensions In the embodiment, the distance L between the end 94c on the base 36 side of the lid 94 and the tip of the electrode 52 is 6.2 [mm], and the outer diameter D of the lid 94 is 16.5. [Mm], 19.0 [mm], and 22.0 [mm] were tested.

  However, the distance L is preferably 1.0 [mm] or less, and the outer diameter D is preferably 27.0 [mm] or less. This is because, when the distance L is greater than 41.0 [mm], the total length becomes long, so that the range of selection of a suitable compact instrument is significantly narrowed.

In addition, when the outer diameter D [mm] is larger than 27.0 [mm], the range of selection that can be adapted to a compact lighting fixture that conforms to the outer tube is excessively widened in the radial direction of the outer tube.
5. Others In the embodiment, the included angle X is defined by paying attention to the luminous flux of the lamp. However, the range of 11 [°] ≦ X ≦ 30 [°] is preferable, and the range of 11 [°] ≦ X ≦ 24 [°] is more preferable. By setting it as such a range, in the total luminous flux in the case of having the lid (94), the luminous flux reduction width with respect to the total luminous flux in the case of not having the lid (94) is remarkably improved. Specifically, in the range of 11 [°] ≦ X ≦ 30 [°], a luminous flux ratio of 95 [%] can be ensured. Furthermore, it has been found by a light beam comparison experiment with and without a lid that the light beam ratio can be secured nearly 100 [%] when 11 [°] ≦ X ≦ 24 [°].
<Modification>
Although the present invention has been described based on the above embodiment, the content of the present invention is not limited to the specific examples shown in the above embodiment. For example, the following modifications are possible. Can be implemented.
1. Regarding the outer tube (1) Joining method The mounting of the lid body 94 to the cylindrical body 92 in the embodiment is such that the cylindrical portion 94a of the lid body 94 is fitted over the cylindrical body 92 (that is, the cylindrical portion 94a). The inner peripheral surface of the cylindrical body 92 faces the outer peripheral surface of the cylindrical body 92.) Even if the cylindrical portion of the lid body is fitted into the cylindrical body (that is, the outer peripheral surface of the cylindrical portion is the inner side of the cylindrical body). It may be opposed to the peripheral surface.) The lid may be attached to the end surface of the cylindrical body.

FIG. 6A is a diagram illustrating a part of an outer tube (Modification 1) in which a cylindrical portion of a lid is fitted and joined to a cylindrical body.
As shown in the figure, the outer tube 101 has an outer peripheral surface of the cylindrical portion 105 a and the cylindrical body in a state where the cylindrical portion 105 a of the lid 105 is inserted into the cylindrical body 103. The inner peripheral surface of 103 is fixed by an adhesive 107.

FIG. 6B is a diagram illustrating a part of an outer tube (Modification 2) in which the lid portion of the lid body is attached to the end surface of the cylindrical body.
As shown in the figure, the outer tube 111 has a cylindrical body 113 with a cylindrical portion 115a of the lid body 115 fitted on the cylindrical body 113 and a back surface of the lid 115b of the lid body 115 and the cylinder. The end surface of the shape body 113 is fixed by an adhesive 117.

  Further, in the embodiment and the first and second modifications, the lid and the cylindrical body are fixed by the inorganic adhesive (96, 107, 117). Alternatively, the lid body 94 may be provided with a convex portion, and the lid body may be attached to the other end of the cylindrical body by other methods such as fitting and engaging the concave portion and the convex portion.

  In this case, the cylindrical portion 115a abuts on the outer peripheral surface of the other end portion of the cylindrical body 113, and a step is generated on the base side of the cylindrical portion 115a, thereby making it easy to pull the lamp and easily remove the lamp from the lighting fixture. it can. In the case of a lamp having an E base or a screw-type base such as a swan type, which will be described later, it can be easily attached to and detached from a lighting fixture.

7 to 14 are diagrams showing modifications of the joining method.
In these modifications, the lid is engaged with the cylindrical body. Hereinafter, specific examples will be described.
FIG. 7 is a perspective view showing the other end portion of the outer tube according to Modifications 3 and 4. FIG.

  As shown in FIG. 7A, the outer tube 121 according to Modification 3 includes a cylindrical body 123 and a lid body 125, as in the embodiment, and the lid body 125 is the other end of the cylindrical body 123. Is attached to. In this case, in addition to the coupling between the two by the engagement structure, the coupling using the adhesive as described in the embodiment may be performed.

  The cylindrical body 123 has an enlarged diameter portion 123a whose other end is enlarged in a trumpet shape. That is, at least the outer surface of the other end portion of the cylindrical body 123 is expanded in a trumpet shape. Similarly to the embodiment, the lid body 125 includes a cylindrical portion 125 a and a lid portion 125 b, and the cylindrical portion 125 a is engaged with the enlarged diameter portion 123 a of the cylindrical body 123.

  The cylindrical portion 125a of the lid body 125 extends from the periphery of the lid portion 125b in a state orthogonal to the lid portion 125b before being attached. In this state, the lid body 125 is covered with the other end of the cylindrical body 123. Thereafter, when the cylindrical portion 125 a is caulked, the inner peripheral surface (part or all) of the cylindrical portion 125 a comes into contact with the outer peripheral surface (part or all) of the enlarged diameter portion 123 a of the cylindrical body 123. Thereby, the lid body 125 is attached to the cylindrical body 123.

  Even if the cylindrical portion 125a is not in contact with the enlarged diameter portion 123a in the crimped state, if the inner diameter of the peripheral edge of the cylindrical portion 125a is smaller than the outer diameter of the enlarged diameter portion 123a, the lid 125 is a cylindrical body. When trying to deviate from 123, the cylindrical portion 125 a can be engaged with the enlarged diameter portion 123 a of the cylindrical body 123 to achieve the object.

  Thus, even if the cylindrical portion 125 a is not in contact with the enlarged diameter portion 123 a, the cylindrical portion 125 a becomes the enlarged diameter portion 123 a of the cylindrical body 123 when the lid 125 is about to be detached from the cylindrical body 123. Even when engaged, the lid 125 is engaged with or engaged with the cylindrical body 123.

  The lid 125 according to the modified example 3 is linearly inclined so that the entire cylindrical portion 125a approaches the tube axis of the cylindrical body 123 as the distance from the lid 125b increases. As shown in FIG. 5B, the end of the cylindrical portion 133 on the opposite side to the lid portion 135 is a bent region 137 that is bent inwardly (so as to approach the tube axis of the cylindrical body 123). The body 131 may be used (Modification 4).

  In this case, the cylindrical portion 125a abuts on the outer peripheral surface of the other end portion of the cylindrical body 123, and a step is generated on the base side of the cylindrical portion 125a, so that the lamp can be easily pulled and the lamp can be easily detached from the lighting fixture. it can. Further, since there is a step on the side surface of the lid 125, it is easy to hold the lid 125 and rotate the lamp in the circumferential direction of its tube axis, and a lamp having a screw-type base such as an E base or a swan type described later. In some cases, attachment to and removal from the lighting fixture can be facilitated.

FIG. 8 is a perspective view showing the other end portion of the outer tube according to Modifications 5 and 6.
As shown in FIG. 8A, the outer tube 141 according to the modified example 5 includes a cylindrical body 143 and a lid body 145 as in the embodiment, and the lid body 145 is the other end of the cylindrical body 143. Is attached to.

  Similar to the third modification, the cylindrical body 143 has a diameter-enlarged portion 143a that expands in a trumpet shape. The lid body 145 includes a lid portion 147 and a plurality of extending portions 149a, 149b, and 149c extending from the periphery of the lid portion 147 along the tube axis direction of the cylindrical body 143. In FIG. 8A, only three extending portions appear due to the drawing display (perspective view).

  The plurality of extending portions 149a, 149b, and 149c are formed at intervals in the circumferential direction. That is, the cylindrical portion 125a of the lid body 125 according to the modified example 3 has a shape in which a notch portion (148) is provided at a predetermined interval in the circumferential direction.

  Each extending portion 149a, 149b, 149c is inclined so as to approach the tube axis of the cylindrical body 143 as it is separated from the lid portion 147, and is constituted by the tips of the extending portions 149a, 149b, 149c. The diameter (inner diameter) of the circumference is smaller than the outer diameter of the other end of the cylindrical body 143.

  The extending portions 149a, 149b, and 149c can be elastically deformed in the thickness direction of the extending portions 149a, 149b, and 149c, and the extending portions 149a, 149b, and 149c are related to the enlarged diameter portion 143a of the cylindrical body 143. Match.

  The lid body 145 according to the modified example 5 has an inverted “V” -shaped cutout portion 148 between the adjacent extending portions 149a, 149b, and 149c, but the adjacent portions as shown in FIG. A lid 151 having a rectangular cutout 155 between the extending portions (153a, 153b) may be used (Modification 6).

  In this case, the extending portions 149a, 149b, and 149c are in contact with the outer peripheral surface of the other end portion of the cylindrical body 143, and a step is generated on the base side of the extending portions 149a, 149b, and 149c, so that the lamp is easily pulled. The lamp can be easily removed from the lighting fixture. In addition, since there is a step or a vertical groove on the side surface of the lid body 145, the lid body 145 is held, and the lamp can be easily rotated in the circumferential direction of the tube axis, and an E-type base or a screw-type base such as a swan type described later can be used. In the case of the lamp having, it can be easily attached to and detached from the lighting fixture.

FIG. 9 is a perspective view showing the other end portion of the outer tube according to Modification 7.
The lids 125 and 135 in the modified examples 3 and 4 have cylindrical portions 125a and 133 having a constant thickness, and the lids 145 and 151 in the modified examples 5 and 6 are extended portions 149a, Although 149b, 149c, 153a, and 153b are provided, a projection may be provided on the inner surface of the cylindrical portion as shown in FIG.

Similar to the embodiment, the outer tube 161 according to the modified example 7 shown in the figure includes a cylindrical body 163 and a lid body 165, and the lid body 165 is engaged with the other end of the cylindrical body 163. .
Similar to the third modification, the cylindrical body 163 has a diameter-enlarged portion 163a that expands in a trumpet shape. The lid body 165 includes a lid portion 167 and a cylindrical portion 169 that extends from the peripheral edge of the lid portion 167 in a cylindrical shape along the tube axis direction.

A plurality of protrusions 169a, 169b, 169c are formed on the inner peripheral surface of the cylindrical portion 169 at intervals in the circumferential direction.
Each of the protrusions 169a, 169b, 169c protrudes so as to approach the tube axis of the cylindrical body 163, and the protruding tip is larger than the outer diameter of the other end of the cylindrical body 163 (the opening end in the enlarged diameter portion). It is located on the inner side, that is, on the side close to the tube axis of the cylindrical body 163.

  Thus, when a load is applied to the lid 165 from the other end of the cylindrical body 163, the protrusions 169a, 169b, and 169c of the lid 165 are engaged with the diameter-enlarged portion 163a of the cylindrical body 163. In addition, the lid body 165 can be prevented from being detached from the cylindrical body 163.

  Since the protrusions 169a, 169b, and 169c are formed at intervals in the circumferential direction, the cylindrical portion 169 of the lid can locally expand in diameter (elastically deform), and the cylindrical shape of the lid 165 Mounting to the body 163 is possible.

  In this case, the cylindrical portion 169 contacts the outer peripheral surface of the other end portion of the cylindrical body 163, and a step is generated on the base side of the cylindrical portion 169, so that the lamp can be easily pulled and the lamp can be easily removed from the lighting fixture. it can. In addition, when there is a step or unevenness on the side surface of the lid body 165 or there is a hole for caulking in the locking structure, it is easy to hold the lid body 165 and rotate the lamp in the circumferential direction of the tube axis. In the case of a lamp having an E base or a screw-type base such as a swan type, which will be described later, it can be easily attached to and detached from the lighting fixture.

  The lids in the modified examples 3 to 7 are a cylindrical part (for example, 125a in FIG. 7A) and an extending part (for example, 149a in FIG. 8A) along the other end of the cylindrical body. However, the lid has any structure and shape as long as the range of the included angle X is in the range of 11 [°] to 57 [°] as described above. good.

10A and 10B are diagrams showing an outer tube according to Modification Example 8, FIG. 10A is a perspective view showing the other end side, and FIG. 10B is a front view (a part thereof).
As shown in FIG. 10A, the outer tube 171 according to the modified example 8 includes a cylindrical body 173 and a lid body 175, as in the embodiment, and the lid body 175 is the other end of the cylindrical body 173. It is attached to.

  As in the third modification, the cylindrical body 173 has an enlarged diameter portion 173a on the other end side. Similarly to the embodiment, the lid body 175 has a lid portion 177 and a cylinder portion 179, and the cylinder portion 179 is located on the lid portion 177 side and engages with an enlarged diameter portion 173a. , And an overhang region 179b that projects away from the periphery of the engagement region 179a with respect to the tube axis of the cylindrical body 173. When there is such an overhang region 179b, it becomes easy to grasp the lid body 175, it becomes easy to apply torque (load), and as a result, the insertion / extraction property is remarkably improved.

  With regard to insertability, in a compact type lamp, particularly a lamp having an outer tube diameter of 28 [mm] or less, a conventional triple tube type in which a tip portion having no lid is closed with a substantially hemispherical outer tube, torque ( (Load) is difficult to apply.

  Therefore, as shown in FIG. 6B, when the lid 115 is present, the lid 115 has an angle at the heel of the lid 115, so that it is easy to apply torque. If the shape of the lid is polygonal, the insertability is further improved, and there are steps or irregularities on the sides of the lid, and there are holes in the locking structure (Fig. 9) and vertical grooves. However, the insertion / extraction is improved.

  The above is a structure that mechanically locks, but when an adhesive is used, for example, the adhesive is applied to the inner side of the lid and the adhesive is applied to the outer side of the outer tube. If it is such a structure, it will be easy to degas when adhering an adhesive agent. Further, when an adhesive is applied to the periphery of the outer tube, the hermeticity of the outer tube is improved.

As shown in FIG. 10B, the lid body 175 having the above configuration is attached to the cylindrical body 173 at a position where the included angle X is in the range of 11 [°] to 57 [°].
In the modified example 8, when the lid body 175 is viewed from the extending direction of the tube axis of the cylindrical body 173, the overhang region 179b projects in a circular shape, but the included angle X is 11 [°] or more and 57 [°. ] If it is in the following range, it may be projected in other shapes.

FIG. 11 is a perspective view showing a lid according to the ninth modification.
Similarly to the lid body 175 according to the modification example 8, the lid body 181 according to the modification example 9 includes a lid part 183 and a cylinder part 185. The cylinder part 185 includes an engagement region 185a on the lid part 183 side, And an overhanging region 185b protruding from the periphery of the engaging region 185a.

The overhang region 185b projects into a polygonal shape, here a regular octagonal shape, when viewed from the extending direction of the tube axis of the tubular body (173).
The lid 125 according to the above-described embodiment and the like has a circular shape when viewed from the extending direction of the tube axis of the cylindrical body 123, but an elliptical or polygonal lid is other than the cylindrical body. It may be fitted to the end.

  In this case, the cylindrical portion 185 is in contact with the outer peripheral surface of the other end portion of the cylindrical body, so that a step is generated on the base side of the cylindrical portion 185 and the overhanging region 185b is provided. Can be easily removed from the lighting fixture. Further, when the shape of the lid 181 viewed from the lamp front end direction is a polygon, the lid 181 is held and the lamp can be easily rotated in the direction of the circumference of its tube axis. In the case of a lamp having a screw-type base, it can be easily attached to and detached from the lighting fixture.

Hereinafter, for example, when the lid is viewed from the extending direction of the tube axis of the cylindrical body, a modified example having a regular octagon will be described.
FIG. 12 is a perspective view showing a lid according to Modifications 10-12.

Here, the lids according to the modified examples 10 to 12 are attached to the other end of the cylindrical body 123 described in the modified example 3.
As illustrated in FIG. 12A, the lid body 201 according to the modified example 10 includes a lid portion 203 and a cylinder portion 205. The lid portion 203 has a polygonal shape, here, a regular octagonal shape when viewed from the extending direction of the tube axis of the cylindrical body 123. The cylindrical portion 205 extends from each side of the regular octagonal lid portion 203 along the tube axis of the cylindrical body 123.

  As illustrated in FIG. 12B, the lid body 211 according to the modification 11 includes a lid portion 213 and a cylinder portion 215. The lid portion 213 has a polygonal shape, here, a regular octagonal shape as in the modified example 10, when viewed from the extending direction of the tube axis of the cylindrical body 123.

The cylindrical portion 215 extends from each side of the regular octagonal lid portion 213 along the tube axis of the cylindrical body 123, and similarly to the modified examples 8 and 9, the engagement region 215a and the overhang region 215b Have
The overhang region 215b projects into a regular octagon when viewed from the extending direction of the tube axis of the cylindrical body 123.

  As illustrated in FIG. 12C, the lid body 221 according to the modification 12 includes a lid portion 223 and a cylinder portion 225. The lid body 223 has a polygonal shape, here, a regular octagonal shape as in the modified example 10, when viewed from the extending direction of the tube axis of the cylindrical body 123.

  The cylindrical portion 225 extends from each side of the regular octagonal lid portion 223 along the tube axis of the cylindrical body 123, and has an engagement region 225a and an overhanging region 225b, as in the eleventh modification. However, the overhang region 225b here projects in a circular shape when viewed from the extending direction of the tube axis of the cylindrical body 123.

  In this case, the cylindrical portions 205, 215, and 225 come into contact with the outer peripheral surface of the other end portion of the cylindrical body 123, so that a step is generated on the base side of the cylindrical portions 205, 215, and 225, and the overhang regions 215 b and 225 b are formed. In some cases, the lamp can be easily pulled and removed from the luminaire. Further, when the shapes of the lids 201, 211, and 221 viewed from the front end direction of the lamp are polygons, the lids 201, 211, and 221 are held, and the lamp can be easily rotated in the circumferential direction of the tube axis. In the case of a lamp having an E base or a screw-type base such as a swan type, which will be described later, it can be easily attached to and detached from a lighting fixture.

  In Modifications 10 to 12 described above, the lid having a shape other than circular when the lid (lid) is viewed from the extending direction of the tube axis of the cylindrical body has been described. The cylindrical portion described in the modified examples 4 to 7 may be used.

Furthermore, in embodiment and the modifications 1-12, although the cover part of a cover body is flat form (flat shape), another shape may be sufficient.
Hereinafter, modified examples of the shape of the lid will be described.

FIG. 13 is a perspective view showing a lid according to Modification 13 and Modification 14. FIG.
Here, it is assumed that the lid bodies according to the modified examples 13 and 14 are attached to the other end of the cylindrical body 123 described in the modified example 3.

  As illustrated in FIG. 13A, the lid body 231 according to the modified example 13 includes a lid portion 233 and a cylinder portion 235. The lid portion 233 has a circular outer shape when viewed from the extending direction of the tube axis of the cylindrical body 123, and a central portion of the lid portion 233 is recessed into the inner side (on the base 36 side). 237. The cylindrical portion 235 extends from the peripheral edge of the lid portion 233 along the tube axis of the cylindrical body 123.

  Since the central portion of the lid portion 233 is recessed, a portion 237 a that faces (contacts) the inner peripheral surface of the other end portion of the cylindrical body 123 is formed, and the portion 237 a and the cylindrical portion 235 form the cylindrical body 123. The end can be clamped.

  As illustrated in FIG. 13B, the lid body 241 according to the modification 14 includes a lid portion 243 and a cylinder portion 245. The lid 243 has a circular outer shape when viewed from the extending direction of the tube axis of the cylindrical body 123, and a hemispherical shape (dome) when viewed from the direction perpendicular to the tube axis of the cylindrical body 123. Shape).

  In the modified examples 13 and 14, as the modified example of the shape of the lid, the lid 231 having the recessed region 237 and the lid 241 having a dome-shaped curved projection are described. The cylindrical portion may be a cylindrical portion as described in the embodiment, the first modification, the second modification, and the fourth modification to the eleventh modification.

  Further, in the modified examples 13 to 14, the other end portion of the cylindrical body of the outer tube is expanded in diameter, and the lid is engaged with the expanded diameter portion, but the other end portion of the cylindrical body is contracted. It may be an outer tube having a diameter and a lid engaged with the reduced diameter portion.

  In this case, the cylindrical portions 235 and 245 come into contact with the outer peripheral surface of the other end portion of the cylindrical body 123, and a step is generated on the base side of the cylindrical portions 235 and 245, so that the lamp is easily pulled and the lamp is removed from the lighting fixture. It can be made easier. Also, since there are steps on the sides of the lids 231 and 241, it is easy to hold the lids 231 and 241 and rotate the lamp in the circumferential direction of the tube axis, and to use a screw-type base such as an E base or a swan type described later. In the case of the lamp having, it can be easily attached to and detached from the lighting fixture.

Hereinafter, the outer tube in which the other end portion of the cylindrical body is reduced in diameter and the lid is engaged with the reduced diameter portion will be described as modified examples 15 and 16.
FIG. 14 is a cross-sectional view of the other end of the outer tube according to Modification 15 and Modification 16.

  As shown in FIG. 14A, the outer tube 251 according to the modified example 15 includes a cylindrical body 253 and a lid body 255. The diameter of the other end portion of the cylindrical body 253 is gradually reduced toward the other end. That is, the end of the cylindrical body 253 is a reduced diameter portion 253a (note that the other end is open).

  The lid 255 has an inverted “Ω” shape, and a hemispherical (dome-shaped) hemispherical portion 257 is located inside the cylindrical body 253 and extends outward from the edge of the hemispherical portion 257. The protruding portion 259 is located outside the cylindrical body 253, and the hemispherical portion 257 and the extending portion 259 are larger than the opening diameter at the other end of the cylindrical body 253.

  The extending portion 259 has a notch 261 with a predetermined circumferential direction, and the notched portion 261 can be elastically deformed so that the extending portion 259 approaches the tube axis of the cylindrical body 253. The lid 255 can be attached to the other end of the cylindrical body 253. That is, the lid body 255 is engaged with the other end portion of the cylindrical body 253.

  In this case, by projecting the hook indicated by the extending portion 259 from the tip of the outer tube 251, the lamp can be easily pulled and the lamp can be easily detached from the lighting fixture. In addition, in the case of a lamp having an E base or a screw-type base such as a swan type, which will be described later, it is easy to turn the lamp in the circumferential direction of its tube axis by holding the lid 255, and it can be attached to and detached from the lighting fixture. Can be easier.

  As shown in FIG. 14B, the outer tube 271 according to the modification 16 includes a cylindrical body 273 and a lid 275. The other end portion of the cylindrical body 273 is a reduced diameter portion 273a whose diameter gradually decreases as it approaches the other end (note that the other end is open).

  Similarly to the embodiment, the lid body 255 includes a lid portion 277 and a cylindrical portion 279, and is the back surface of the lid portion 277 (the surface on the side where the base 36 exists) and the other end of the cylindrical body 273. A pair of locking arms 281a and 281b that extend from the portion facing the opening to the base (36) side and engage with the opening.

  The locking arms 281a and 281b have a “V” shape (a shape that faces sideways so that the bent portion is outward) projecting outward, and the bent portion is larger than the opening diameter. The locking arms 281a and 281b can be elastically deformed in a direction perpendicular to the tube axis of the cylindrical body 273, whereby the bent portions 281c and 281c of the locking arms 281a and 281b are moved into the cylindrical body 273. Can be inserted. That is, the lid body 275 can be engaged with the other end portion of the cylindrical body 273.

  Note that the lid body 275 according to the modified example 16 has the tips of the locking arms 281a and 281b in contact with the convex portion 90 of the inner tube 32, and suppresses vibration of the inner tube 32 during product transport. can do.

In this case, the cylindrical portion 279 contacts the outer peripheral surface of the other end of the cylindrical body 273, and a step is generated on the base side of the cylindrical portion 279, so that the lamp can be easily pulled and the lamp can be easily removed from the lighting fixture. it can. In addition, since there is a step on the side surface of the lid body 275, it is easy to turn the lamp in the circumferential direction of its tube axis by holding the lid body 275, and in the case of a lamp having an E base or a screw-type base such as a swan type described later In addition, it can be easily attached to and detached from the lighting fixture.
(2) Lid Material Although the lid 94 in the embodiment is made of aluminum, any material can be used as long as it is less brittle than the cylindrical portion of the outer tube. However, when the translucency is higher than that of the cylindrical portion, the luminous flux from the lamp becomes high, so that it is possible to ensure a luminous flux of 90% or more for the lamp without the lid.

As materials other than aluminum, materials such as stainless steel (for example, SUS304), iron, alloys containing these, alumina, zirconia, and steatite can be used.
(3) Shape of cylindrical body In the embodiment and the various modifications described above, the cylindrical body has a cylindrical shape with a circular cross-sectional shape. For example, it may be a regular hexagonal cylinder. Furthermore, only the other end may be a cylinder having a cross-sectional shape of an ellipse or a polygon (for example, a regular hexagon).

Further, the cylindrical body may have a shape that bulges outward (in a direction perpendicular to the central axis) at the center portion thereof.
FIG. 15 is a view showing a lamp using an outer tube according to Modification 17.

  The outer tube 303 of the lamp 301 shown in the figure includes a cylindrical body 305 and a lid body 94. The cylindrical body 305 has a bulging portion 307 that bulges in a direction perpendicular to the central axis at the central portion in the central axis direction, and the central portion is thicker than both end portions.

  In order to ensure a clearance when the outer tube 303 is put on the inner tube 32 in the assembling process, the cylindrical body 92 has an average of 1 in the bulged portion 307 in the central portion of the outer tube 303. [Mm] to 5 [mm].

In addition, when it has the bulging part 307, the maximum outer diameter of the bulging part 307 is 20 [mm]-27 [mm] with respect to compact instrument adaptation, and in parts other than the bulging part 307, for example, in the outer tube 303 The outer diameter of a portion (so-called neck portion) located on the base side of the bulging portion 307 is preferably 20 [mm] to 23 [mm]. In this case, the wall thickness of the bulging portion and the neck portion is preferably 1 [mm] to 2 [mm].
(4) Others The outer tube (for example, “34”) in the embodiment or the like mainly covers the inner tube (for example, “32”), and the inner tube is damaged for some reason. However, the anti-scattering function is provided to prevent the fragments from scattering, but other functions may be provided.

  Other functions include an adhesive that joins the base and outer tube, or the base and inner tube, and a drop that locks the base and prevents the outer tube from falling against the base and inner tube. There is a prevention function. In addition, what is necessary is just to provide a convex part in the inner surface near the edge part located in the nozzle | cap | die side of an outer pipe | tube, for example, in order to implement | achieve a fall prevention function.

In addition, since the bulging portion 307 is provided like the outer tube 301 described in the modified example 17, a function of reducing the temperature rise of the outer tube 301 due to heat from the discharge tube 30 is added. As a result, the tolerance from the strain point of the hard glass can be increased, and the range of selection of a suitable tool can be expanded. Further, the safety when the discharge tube 30 is broken can be improved.
2. Inner tube The shape of the inner tube is not limited to the embodiment.

The tip part of the inner diameter (the end part opposite to the pinch seal part) may not be flat, and the tip-off part may be in a part other than the tip part.
The inner tube may have the bulging portion described in the modified example 17 in the inner tube. In this case, the outer diameter of the bulging part is 13 [mm] to 17 [mm], and the wall thickness is 1 [mm] to 2 [mm].

  Further, the inner tube has a pinch seal portion and an intermediate region between the pinch seal portion and the tip portion, for example, is substantially cylindrical, and an envelope of the discharge tube is disposed in the intermediate region. Also good.

The cross-sectional shape of the intermediate region is not limited to a substantially cylindrical shape, and may be a polygon or an ellipse. In addition, the inner diameter and outer diameter of the intermediate region do not necessarily have to be uniform along the central axis direction of the inner tube. For example, the inner diameter and outer diameter of the position corresponding to the main tube portion of the discharge tube may be other positions. The shape may be larger than the inner diameter and the outer diameter of the inner surface, that is, the shape may have a bulging portion in part.
3. Supporting the inner tube In the embodiment, the pinch seal portion 86 of the inner tube 32 is held by the grip portion 98 of the base 36 to support the inner tube 32 (both are fixed with an adhesive). The inner tube may be supported by this method.

  As another method, for example, the inner tube may be fixed to the outer tube with an adhesive without being joined to the base. Furthermore, a plate-like member may be arranged in the outer tube, and the inner tube may be supported by this plate-like member. In other words, the plate-like member has a hole corresponding to the pinch seal portion of the inner tube at the center and a size in which the outer peripheral edge abuts on the inner peripheral surface of the outer tube. The part may be inserted and integrated, and the integrated part may be inserted into the outer pipe to support the inner pipe.

  In this case, the outer peripheral edge of the plate-like member comes into contact with the inner surface of the outer tube, and the inner tube is positioned with respect to the outer tube. The plate-like member can be used to prevent the flow of the adhesive when an adhesive is used when connecting the inner tube, the outer tube and the base (even when not using the adhesive, it can be used for positioning. You can also.)

Further, the inner tube may be supported only by the lead wire using a lead wire having a large diameter (thick).
4). The base in the embodiment or the like is the Edison type, but other types may also be used.

FIG. 16 is a view showing a base portion of a lamp using the base according to the modified example 18.
The lamp 351 according to the modified example 18 has a swan type cap 353. The base 353 includes a main body 355 to which the outer tube 34 is attached, and a pair of two-stage pins 357 and 359 provided on the main body 355.

  In the modified example 18, the lead wires 361 and 363 are made of molybdenum, and the other end portions of the lead wires 361 and 363 pass through the main body portion 355 and are inserted into the two-stage pins 357 and 359 in the caulking portion. 365 and 367 are electrically and mechanically connected to the two-stage pins 357 and 359.

In the embodiment and the above-described modification, the base 36 has the shell portion 82 and the like attached to the main body having the grip portion 98. For example, the first member having the grip portion and the shell portion are attached. After the second member is formed separately, it may be integrated with an adhesive or the like.
5. About the included angle (X) (1) The maximum angle The included angle (X) is, as described above, the edge on the base side of the lid body, and the tip of the electrode located on the lid body side (the base side and the base side). The angle between the line segment connecting the line segment and the central axis of the discharge tube (see FIG. 4).

  In the case where the end of the lid on the base side is, for example, in the embodiment or the third modification, the included angle (X) is constant regardless of the position of the edge, or in the ninth modification, The included angle (X) varies depending on the position of the edge.

In such a case, it can be determined by the largest included angle (X).
(2) Structure / shape (2-1) Example 1
A case where the cover body has a notch as in the fifth and sixth modifications will be described.

FIG. 17 is a diagram illustrating a calculation method of the included angle X when there is a notch.
This figure shows the lid viewed from the electrode side.
Four notches are formed at equal intervals in the circumferential direction. The angle between both ends of the notch and the center O of the lid is B1, and half of the circumference of the lid is a notch.

In the case of having such a cutout portion, light passing through the cutout portion (“C1” in the figure) may be taken into consideration, and the extension direction dimension of the extension portion may be reduced accordingly.
In other words, the peripheral area of the lid with the cutout (the total area of the extended part excluding the area of the cutout) is obtained, and it is equal to this area and is equivalent to the lid without the cutout. The included angle X of the lid body having no notch may be set as the included angle of the lid body having the notched portion.

  Specifically, in the lid shown in FIG. 17, the areas of the cutout portion and the extension portion are equal. Therefore, the entire area of the extended portion is equal to that of the lid body having no cutout portion and having a half dimension of the extended portion.

Therefore, the included angle of the cover body that is half the dimension in the extending direction of the extending part and does not have the notch is the included angle X of the cover body shown in FIG.
(2-2) Example 2
FIG. 18 is a diagram for explaining a method of calculating the included angle X when there is a notch and the extension is curved. In FIG. 18, only the lid is shown, and illustrations of the electrode, the inner tube, the cylindrical body, and the like are omitted.

  In this example, since the extending portion is curved, first, as shown in FIG. 5A, the included angle at an arbitrary position of the extending portion is obtained, and the position at which the maximum included angle X1 is obtained. Find E1. A line segment connecting this position and the electrode is A1a.

  Next, an intersection point F1 between a line segment A3 passing through the position E1 and parallel to the central axis A2 of the discharge tube and a line segment A4 on the lid portion is set. The diameter D, which is twice, is calculated.

That is, a lid body having a curved extension portion can be regarded as a lid body including a lid portion having a diameter D and an extension portion having an extension length H1.
Then, as described with reference to FIG. 17, the dimension H2 of the extension portion of the lid body not having the notch portion is obtained in consideration of the area of the notch portion, and from the intersection F1 to the base side in parallel with the line segment A2. The line segment A1b connecting the position G1 moved to “H2” and the electrode becomes the line segment A1 for obtaining the included angle X.

Even if the lid has a cut-out portion as in the modified examples 5 and 6, the cylindrical portion of the lid is fitted and joined to the cylindrical body, and the shape shown in FIG. Even if it extends to the inside, if the solid angle facing the lid is in the range of 0.12 [sr] or more and 2.86 [sr] or less, the degree of light shielding desired from the electrode tip to the lid is equivalent, The same effect as that obtained when the included angle (X) is 11 [°] or more and 57 [°] or less with respect to the lid body having no notch is provided.
(2-3) Example 3
FIG. 19 is a diagram illustrating a calculation method of the included angle X when the lid is fitted into the other end opening of the cylindrical body. In FIG. 19, only the other end side of the lamp is shown, and the illustration of the electrodes is omitted.

As shown in FIG. 19A, the lamp 401 includes a discharge tube 30, an inner tube 32 that stores the discharge tube 30, an outer tube 403 that stores the inner tube 32, and the like.
The outer tube 403 includes a cylindrical body 405 and a lid body 407 that closes the other end opening of the cylindrical body 405, and the lid body 407 is fitted into the other end opening of the cylindrical body 405. The lid body 407 has a disk shape. The attachment of the lid 407 to the cylindrical body 405 is performed by, for example, an adhesive. That is, the peripheral surface of the lid body 407 is fixed to the inner peripheral surface of the cylindrical body 405 with an adhesive.

  In the lamp 401 having such a configuration, a line connecting the edge located on the side near the one end of the cylindrical body 405 and the tip of the electrode located on the lid 407 side of the pair of electrodes in the lamp 407. The angle between the segment A1 and the line segment A2 coinciding with the central axis of the discharge tube 30 is the maximum, and this angle is the sandwich angle X.

As shown in FIG. 19B, the lamp 451 includes a discharge tube 453, an inner tube 455, an outer tube 457, and the like.
The outer tube 457 includes a cylindrical body 459 and a lid body 461 that closes the other end opening of the cylindrical body 459, and the lid body 461 is fitted into the other end opening of the cylindrical body 459. The lid body 461 includes a base portion 463 and a columnar portion 465 provided at the center of the base portion 463.

  The cross-sectional shapes of the base portion 463 and the columnar portion 465 correspond to the inner peripheral shape of the cylindrical body 459, and here are circular, and the outer diameter of the base portion 463 is larger than the outer diameter of the columnar portion 465. The outer peripheral surface of the portion 463 is fixed to the inner peripheral surface of the cylindrical body 459 with an adhesive.

  In this example, the concave portion 469 corresponding to the convex portion 467 of the inner tube 455 is formed on the end surface of the columnar portion 465 on the inner tube 455 side. The shape of 465 is not limited to this.

In the lamp 451 having such a configuration, the edge of the columnar portion 465 of the lid 461 and the edge located on the side close to one end of the cylindrical body 459 and the tip of the electrode located on the lid 461 side of the pair of electrodes The angle X1 sandwiched between the line segment A1c connecting the line A1c and the line segment A2 coinciding with the central axis of the discharge tube 473 is the peripheral edge of the base portion 463 of the lid body 461 and closer to one end of the cylindrical body 459 Is larger than an angle X2 sandwiched between a line segment A1d connecting the edge positioned at the edge of the pair of electrodes and the tip of the electrode positioned on the lid 461 side, and a line segment A2 coinciding with the central axis of the discharge tube 473. The angle X1 is the maximum, and this angle X1 is the included angle X.
(3) Transmittance The material of the lid, that is, the transmittance is not particularly described. However, even if the lid has the same size, the luminous flux from the lamp is different if the transmittance is different. That is, a lid made of a material having a high transmittance can obtain a light flux of 90 [%] or more even if the included angle X exceeds 57 [°].

In such a case, similarly to the above-described notch, the lid body may be made smaller (equivalent) corresponding to the amount of light transmitted through the lid body, and the included angle X may be calculated using this lid body.
(4) Solid angle Using the solid angle (ω), the included angle (X) is in the range of 11 [°] to 57 [°] (11 [°] ≦ X ≦ 57 [°]). 12 [sr] ≦ ω ≦ 2.86 [sr].
6). Summary The embodiment and various modifications may be combined with each other, and the outer tube can be changed without departing from the spirit of the present invention.

  INDUSTRIAL APPLICABILITY The present invention can be used to secure a luminous flux while ensuring safety when a discharge tube is broken.

14 Lamp 30 Discharge tube 32 Inner tube 34 Outer tube 36 Base 92 Cylindrical body 94 Cover body X Angle

Claims (4)

An inner tube that houses a discharge tube having a pair of electrodes is housed in the outer tube, and is a metal vapor discharge lamp having a base on one end side of the outer tube,
The outer tube includes a glass cylindrical body and a lid that closes the other end opening of the cylindrical body,
The largest angle among the angles between the line segment connecting the position on the edge of the lid and the tip of the electrode located on the lid side of the pair of electrodes and the central axis of the discharge tube. Let X be
The included angle X is 11 [°] ≦ X ≦ 57 [°]
A metal vapor discharge lamp characterized by satisfying the following relationship. An inner tube that houses a discharge tube having a pair of electrodes is housed in the outer tube, and is a metal vapor discharge lamp having a base on one end side of the outer tube,
The outer tube includes a glass cylindrical body and a lid that closes the other end opening of the cylindrical body,
When the solid angle formed by the lid facing the tip of the electrode located on the lid side of the pair of electrodes is ω,
The solid angle ω is 0.12 [sr] ≦ ω ≦ 2.86 [sr].
A metal vapor discharge lamp characterized by satisfying the following relationship. The metal vapor discharge lamp according to claim 1 or 2, wherein the lid is fixed to the cylindrical body with an inorganic adhesive. The metal vapor discharge lamp according to any one of claims 1 to 3, wherein the lid has an engaging portion that engages with the other end of the cylindrical body.

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