JP2010251262A - Discharge lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a discharge lamp wherein a light emitting tube is hardly broken when subjected to an unexpected load. <P>SOLUTION: In the discharge lamp 1, the double-spiral-shape light emitting tube 3 has both tube ends 17 bridged to tube end inner periphery side portions 37 adjacent to the inner periphery side thereof with adhesive members 31. Further, a turn outermost periphery portion 51 and the following outer periphery portion 53 are bridged to each other with connecting members 7. This suppresses the relative rotation of two turn outermost periphery portions 51, 52 around a straight line between the two adhesive members 31, as a rotational axis. Thus, in removing the discharge lamp 1 from a lighting fixture, even when the turn outermost periphery portions 51, 52 are inadequately pulled, the light emitting tube 3 is hardly broken. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a discharge lamp provided with an arc tube having a shape that turns one or more times in a double spiral shape in plan view toward each of both tube end portions with the tube center portion as a turning center.

Conventionally, as shown in FIG. 15, as a discharge lamp 201 used for general illumination, an arc tube 203 having a planar shape and a spiral shape with the central portion of the tube as a turning center D (hereinafter referred to as “spiral light emission”). Some are known as “tubes”.
The discharge lamp 201 provided with such a spiral arc tube 203 has a problem that it is easily damaged when being attached to or detached from the lamp. Specifically, when the caps 225 provided at both tube end portions 217 of the arc tube 203 are inserted into or pulled out from the socket of the lamp, a large load that relatively displaces both tube end portions may be applied. There is a possibility that the arc tube 203 may be damaged.

With respect to such a problem, in the discharge lamp described in Patent Document 1 below, each tube end portion 217 of the spiral arc tube 203 and a portion 237 that rotates on the inner peripheral side adjacent to the tube end portion 217 are provided. By cross-linking with the silicone resin adhesive 231, the relative displacement of both the tube end portions 217 of the arc tube 203 is suppressed, and the damage when being attached to and detached from the lamp is prevented.
Further, Patent Document 2 below describes that an outer peripheral side tube and an inner peripheral side tube are cross-linked with a silicone adhesive in an annular double tube type fluorescent lamp in which one discharge path is formed. ing. The ring-type double-tube fluorescent lamp needs to be reinforced because the bridge connecting the outer periphery and inner periphery is easily damaged by thermal stress due to heat generated when the lamp is turned on and external force applied during lamp replacement. It is.

JP 2008-198493 A Japanese Patent No. 3219013

The discharge lamp described in Patent Document 1 is not likely to break if it is properly handled, but the arc tube may be damaged if an unintended load is applied due to incorrect handling.
FIG. 16 shows an example of a state where both tube end portions 217 (specifically, the base 225) of the arc tube 203 are inserted into the socket 270 of the lamp, that is, a state where the discharge lamp 201 is attached to the lamp. Show. In this example, in order to remove the discharge lamp 201 from the lamp, it is necessary to rotate the discharge lamp and pull out both tube end portions 217 of the arc tube 203 from the socket 270.

  However, for example, since the user does not know how to remove the lamp appropriately, the outermost periphery of the arc tube 203 is accidentally left in a state where both the tube end portions 217 of the arc tube 203 are inserted into the socket 270 of the lamp. A situation is conceivable in which the arc tube 203 is pulled in a direction in which the arc tube 203 cannot be removed (for example, downward in the figure). In such a case, an unscheduled load is applied to the arc tube 3 and the arc tube 203 may be damaged.

  In order to solve the occurrence of such breakage, both the tube end portions 217 are enlarged by increasing the size of the holder 221 that holds both tube end portions 217 of the arc tube 203, the connecting plate portion 223 that connects the holders 221 and the like. It is conceivable to increase the width for bridging each of the tube end portions 217 and the portion 237 that pivots on the inner peripheral side thereof. However, an increase in cost and an adverse effect due to the connecting plate portion 223 located on the back surface of the arc tube are problematic. The increase in the cost may be due to an increase in the amount of material used due to an increase in size of the holder 221 or the like, or an increase in the cost for manufacturing the holder 221 or the like having a dimension corresponding to the outer diameter of the arc tube 203. In addition, an adverse effect due to an increase in the size of the connecting plate portion 223 may interfere with, for example, light emitted from the back surface of the discharge lamp being reflected by the lamp shade and traveling toward the irradiated surface.

  In view of the above-described problems, the present invention provides a discharge lamp in which the arc tube is less likely to be damaged even when an unscheduled load is applied to the outermost periphery of the swivel in a flat double spiral arc tube. Objective.

  In order to achieve the above object, a discharge lamp according to the present invention comprises an arc tube having a shape that swirls one or more times in a double spiral shape in plan view toward each of both tube end portions with a tube center portion as a swivel center, A pair of first bridging members that bridge each of the tube ends and a portion of the arc tube that revolves on the inner peripheral side of each of the tube ends to limit the relative displacement thereof; Two members that bridge the turning outermost peripheral part of the arc tube and the part turning on the inner peripheral side thereof to restrict relative displacement thereof, both of the pair of first bridging members in the turning direction And a pair of second bridging members provided at two locations on a reference straight line that is a straight line passing through the turning center in plan view.

The discharge lamp according to the present invention swivels the arcing outermost peripheral portion of the arc tube and a portion that revolves on the inner peripheral side thereof (sometimes referred to as “next outer peripheral portion”) with a pair of first bridging members. A pair of second bridging members bridging at two locations separated in the direction is provided, and a discharge lamp is obtained in which the arc tube is not easily damaged even when an unscheduled load is applied to the outermost periphery of the arc tube. be able to.
Furthermore, in the discharge lamp according to the present invention, the reference straight line may have an intersection angle of 45 degrees or more with the straight line connecting the pair of first bridging members. The location on the reference straight line where the crossing angle with the straight line connecting the pair of first bridging members is 45 degrees or more is a location where the relative displacement amount between the outermost turning portion and the next outer peripheral portion is large (see the embodiment). . Therefore, if the said structure is employ | adopted, the deformation | transformation of an arc_tube | light_emitting_tube can be suppressed effectively by restrict | limiting the relative displacement of a location with a large relative displacement amount, and it can make it difficult to damage an arc_tube | light_emitting_tube.

  Furthermore, in the discharge lamp according to the present invention, the reference straight line may be substantially orthogonal to a straight line connecting the pair of first bridging members. A location on a reference line that is substantially orthogonal to a straight line that connects the pair of first bridging members is a location where the relative displacement between the outermost periphery of the turn and the next outer periphery is very large (see the embodiment). Therefore, if the said structure is employ | adopted, a deformation | transformation of an arc_tube | light_emitting_tube can be suppressed very effectively and it can make it difficult to damage an arc_tube | light_emitting_tube.

  Further, in the discharge lamp according to the present invention, the distance between the both ends in the turning direction of the second bridging member is 4 degrees or more when the angle formed by two straight lines connecting the both ends and the turning center in a plan view. It can be 15 degrees or less. By making the angle formed by the two straight lines more than 4 degrees, the user does not know how to remove the discharge lamp, and the light is emitted while both ends of the arc tube are fixed to the lamp as a test. In a situation where the swiveling outer periphery of the tube is pulled to the irradiated surface side, the arc tube is very difficult to break. Moreover, by making the angle formed by the two straight lines 15 degrees or less, the second bridging member does not become excessive, and an increase in cost can be suppressed.

  Furthermore, in the discharge lamp according to the present invention, the second bridging member is adjacent to the central cross section which is a plane connecting the center lines in the tube radial direction of the radially adjacent portions of the arc tube. A central cross-linking portion that is provided between the portions and is equally divided by the central cross-section, and a back-side cross-linking provided between the adjacent portions adjacent to the central cross-linking portion on the back side that does not face the irradiated surface The thickness of the central bridge portion in the direction perpendicular to the central cross section can be made smaller than the thickness of the back side bridge portion.

Because of this feature, by providing the second bridging member biased to the back side between the radially adjacent portions of the arc tube, the side facing the irradiated surface of the arc tube is not obstructed. Can be suppressed. Moreover, the relative displacement of the adjacent portions can be effectively suppressed by bridging the vicinity of the central cross section with the central bridging portion.
Furthermore, the discharge lamp according to the present invention further includes a pair of tube end holding members that hold each of the tube end portions and are connected to the lamp, and the pair of tube end holding members are connected to the lamp. In this state, the arc tube is deformed by displacing the straight line connecting the pair of first bridging members at the outermost peripheral part of the turning and two points on the orthogonal line orthogonal to the turning center to the irradiated surface side. In the case where the load to be deformed is a deformation load, the pair of pipe end holding members release the holding of at least one of the pipe end portions when the value of the deformation load exceeds a set value. Yes, when the two locations are not cross-linked by the pair of second cross-linking members, the value of the deformation load at which the arc tube breaks is equal to or less than the set value, and the pair of second cross-linking members The two places are cross-linked by Expediently, can be assumed that the value of the deformation load to the arc tube is damaged is greater than the set value.

  With this feature, when an unscheduled load is applied, it is possible to prevent the arc tube from being damaged by releasing the holding of at least one of the tube end portions before the arc tube is damaged. Thereby, it can prevent that the fragment | piece of an arc_tube | light_emitting_tube is scattered on a floor, and can save the effort of cleaning. In the state where the pair of tube end holding members are connected to the lamp, the pair of tube end holding members are prevented from moving to at least the irradiated surface side by the lamp.

Top view of discharge lamp in embodiment Rear view of discharge lamp View of the holder as seen from the tube axis direction of the arc tube Plan view showing the opening angle θ of the adhesive member Cross section of adhesive member Figure showing a graph of tensile force measurement test results Figure showing the statistical values of the tensile force measurement test results Diagram showing deformation of arc tube due to deformation load The figure which shows the graph of the strength test result The figure which shows the statistical value of the strength test result Figure showing numerical values of strength test results The figure which shows the modification of a connection member The figure which shows another modification of a connection member Diagram showing the outer diameter of the arc tube Plan view of a conventional discharge lamp Perspective view of a conventional discharge lamp

Hereinafter, an embodiment of one discharge lamp according to the present invention will be described with reference to the drawings.
<Configuration>
(Discharge lamp)
1 and 2 are a plan view and a rear view of the discharge lamp, respectively. Here, the plan view (FIG. 1) of the discharge lamp 1 is a view of the discharge lamp 1 viewed from the irradiated surface side with the discharge lamp 1 mounted on the lamp, and the rear view (FIG. 2) is the lamp side. It is the figure which looked at the discharge lamp 1 from. The surface shown in the plan view (FIG. 1) of the discharge lamp 1 may be referred to as “front surface”, and the surface shown in the rear view (FIG. 2) may be referred to as “back surface”.

  The discharge lamp 1 includes an arc tube 3 having a single discharge path therein, a tube end connector 5 that connects both tube ends of the arc tube 3, and a pair that bridges two locations of the arc tube 3. The connecting member 7 is included. Note that the discharge lamp 1 has a symmetrical structure, and in the following description, one constituent member may be representatively described with respect to the same two constituent members formed symmetrically with each other. In some cases, the same two components formed symmetrically with each other are given different numbers to distinguish them.

(1) Regarding the arc tube The arc tube 3 has a glass tube curved in a planar double spiral shape, and the entire contour is substantially disk-shaped. The arc tube 3 includes a tube central portion 11 positioned at the center of the spiral, two swiveling portions 15 extending from both ends of the tube central portion 11 and swirling in a spiral shape while increasing the turning radius, And a tube end portion 17 positioned at the outer peripheral end of the portion 15.

The tube center portion 11 is short but has a shape extending along a straight line, and the center portion swells in the tube diameter direction, and particularly swells to the front side of the discharge lamp 1. The coldest spot when the lamp is lit is formed in the bulging portion. A turning center D is located at the center of the tube central portion 11.
The two swivel portions 15 are symmetrical about the swivel center D from each of both ends of the tube center portion 11 to each of the tube end portions 17. In addition, although the two turning parts 15 are made into the shape turned around the turning center D along the one plane, respectively, it is also made into the shape turned around the turning axis line which passes along the turning center D. it can. In the present embodiment, the pivot axis is perpendicular to the one plane (perpendicular to the paper surface in FIG. 1). The turning part 15 can also be referred to as a curved pipe part.

A predetermined gap (“L” in FIG. 3) is secured between adjacent portions of the two swivel portions 15 on different turns. In this figure, each turning part 15 is turned 1.75 rounds (1 and 3/4 rounds).
A portion where the tube center portion 11 and the turning portion 15 are connected is a bent portion 19 having a smaller radius of curvature than the turning portion 15 and bent. The bent portion 19 has a small distance between the outer peripheral portion and the inner peripheral portion of the glass tube wall by bending.

  A so-called bead glass mount type electrode is sealed on each of the tube end portions 17 (not shown). In addition, a sealing portion is formed that hermetically seals the inside of the arc tube 3 by crushing the distal end portion of the tube end portion 17 flatly in the direction of the turning axis during sealing. The electrode includes a filament coil, a pair of lead wires that support the filament coil and protrude from the tube end portion 17 in a swiveling direction, and a bead glass that binds the pair of lead wires.

  Inside the arc tube 3, mercury (mercury alone, an alloy of mercury and zinc, tin, or the like) and a buffer gas (argon gas, neon gas, or a mixed gas thereof) are sealed. A phosphor layer is formed on the inner peripheral surface of the arc tube 3. This phosphor layer is formed, for example, by firing three types of rare earth phosphors that emit red, green, and blue light. Thus, the arc tube 3 of this embodiment is configured as a fluorescent tube, and the discharge lamp 1 is configured as a fluorescent lamp.

The cross section in the tube diameter direction of the glass tube constituting the arc tube 3 has a substantially circular shape, but is not limited thereto, and may be, for example, an elliptical shape or a polygonal shape. For example, barium strontium silicate glass (also a lead-free glass and a soft glass) can be used for the glass tube that is a constituent material of the arc tube 3.
(2) About the tube end connector The tube end connector 5 includes a pair of holders 21 that hold the tube end portion 17, a connecting plate portion 23 that connects the pair of holders 21, and a pair of holders 21. And a base 25 attached to each.

FIG. 3 shows a cross section of the arc tube 3 around the tube end 17 in FIG. 1 cut along the XZ plane as viewed in the Y direction (the direction from the bottom to the top in FIG. 1). The Z direction is orthogonal to the X direction and the Y direction, and is a direction from the front surface to the back surface of the discharge lamp 1.
The holder 21 has a cylindrical portion 27 that holds the tube end portion 17. Specifically, the tube end portion 17 is inserted into the inner periphery of the tubular portion 27, and the adhesive member 31 is filled between them, and the inner peripheral wall of the tubular portion 27 and the outer peripheral wall of the tube end portion 17 Is glued. In the present embodiment, the adhesive member 31 is composed of a silicone resin-based adhesive (hereinafter sometimes referred to as “silicone adhesive”). In this figure, in order to make it easy to grasp, the adhesive member 31 is provided with a lattice pattern, and the cross section of the adhesive member 31 is not shown.

A cutout portion 29 that is partially cut out is formed in a portion of the cylindrical portion 27 on the side of the turning center D in the axial direction. The notch 29 is formed on the opening side of the cylindrical portion 27 (the side where the base 25 is not attached).
The holder 21 has a flat portion on the back side, and has an extending portion 33 that extends from the back side portion to the turning center side. The extension portion 33 is provided with a support protrusion 35 that protrudes toward the arc tube 3 side. The support protrusion 35 extends in the axial direction of the holder 21 (generally the turning direction of the turning portion 15). The distal end portion of the support projection 35 is in contact with a tube end inner peripheral side portion 37 that is a portion that turns on the inner peripheral side of the tube end portion 17 of the arc tube 3.

  The adhesive member 31 protrudes from the periphery of the tube end portion 17 to the support protrusion 35 along the extension portion 33 through the notch portion 29. Then, the adhesive member 31 is filled in a portion surrounded by the extending portion 33, the support protrusion 35, and the tube end inner peripheral side portion 37, whereby the tube end portion 17 and the tube end inner peripheral side portion 37 are bonded. ing. The adhesive member 31 is bonded to the back side portion of the tube end inner peripheral side portion 37 so as not to block light emitted from the front side portion of the tube end inner peripheral side portion 37.

  The adhesive member 31 described above is an example of the “first bridging member”. In the present embodiment, the bonding member 31 bonds the tube end portion 17 and the tube end inner peripheral side portion 37 to the extending portion 33 of the holder 21. From this, it can be considered that the adhesive member 31 indirectly bridges the tube end portion 17 and the tube end inner peripheral side portion 37 via the extending portion 33. In that case, the holder 21 and the adhesive member 31 constitute the “first bridging member”. Further, even if the adhesive member 31 is separated into a portion that bonds the tube end portion 17 and the cylindrical portion 27 of the holder 21 and a portion that bonds the tube end inner peripheral side portion 37 and the extension portion 33. Good.

  When each of the pipe end parts 17 and each of the two pipe end inner peripheral side parts 37 are bridged by the pair of adhesive members 31, the relative displacement of the two swivel parts 15 is changed between the outer peripheral side and the inner peripheral side. It is limited by both (because it is continuous with the tube central portion 11), and the deformation of the arc tube 3 is suppressed. That is, the strength of the arc tube 3 is increased. Therefore, if appropriate handling is performed, there is no possibility that the arc tube 3 is damaged when the discharge lamp 1 is attached to or removed from the lamp.

The base 25 (FIG. 1) has a cup-shaped base body 41 and two pins 43 protruding from the bottom surface thereof. The base body 41 is formed integrally with the holder 21 on the opening side. The two pins 43 pass through the bottom surface of the base body 41 and are connected to electrode lead wires that protrude from the tube end portion 17.
The connecting plate part 23 (FIG. 2) connects the two holders 21 linearly and restricts their relative displacement. Specifically, approach and separation between the two holders 21, relative rotation, and the like are limited. Further, the connecting plate portion 23 is formed integrally with the two holders 21 and is disposed on the extension line of the extending portion 33.

The holder 21, the base body 41, and the connecting plate portion 23 are made of resin (polybutylene terephthalate). In addition, the two pins 43 should just be an electroconductive member, for example, can be made from metal.
In the present embodiment, the “tube end holding member” is configured by the holder 21 and the base 25.

(About one pair of connecting members 7 (one pair of second bridging members))
(1) Position of the connecting member 7 etc.
The discharge lamp 1 bridges the turning outermost peripheral parts 51 and 52 which are the parts turning the outermost circumferences of the two turning parts 15 and the next outer peripheral parts 53 and 54 which are the parts turning the inner peripheral side thereof. It has a pair of connecting members 7 as a pair of second bridging members (FIGS. 1 and 2).

  The connecting member 7 restricts relative displacement between the turning outermost peripheral part 51 (52) and the next outer peripheral part 53 (54) adjacent to each other. Since the connecting member 7 is made of a silicone resin adhesive (silicone adhesive) and can be elastically deformed, the turning outermost peripheral portion 51 (52) and the next outer peripheral portion 53 (54) are connected to the connecting member 7. A slight relative displacement is possible against the elastic force.

As shown in FIG. 4, the pair of connecting members 7 are arranged at positions facing each other on a straight line J connecting the two holders 21 (two adhesive members 31) and a straight line K intersecting at a right angle at the turning center D. Is provided. The center of the connecting member 7 is positioned on the straight line K.
The straight line K is an example of the “reference straight line”. Further, each of the pair of connecting members 7 as “a pair of second bridging members” is provided apart from both of the pair of adhesive members 31 as “a pair of first bridging members”.

(2) Shape of the connecting member 7 and the like.
FIG. 5 shows a cross-section taken along the YZ plane in FIG. 2 as viewed in the −X direction (the direction from left to right in FIG. 2).
The connecting member 7 is provided in the gap 55 between the turning outermost peripheral part 51 and the next outer peripheral part 53. The connecting member 7 is provided at a position biased toward the back side of the arc tube 3. Therefore, the irradiation light emitted from the front side portion of the arc tube 3 is prevented from being blocked by the connecting member 7.

  The shape of the connecting member 7 will be described in detail. The connecting member 7 is disposed in the central region 57 and the back side region 59 in the gap 55. The central region 57 extends along a central cross section E that is a plane connecting the center lines O and P in the radial direction of the turning outermost peripheral portion 51 and the next outer peripheral portion 53, and is bisected by the central cross section E. Area. The rear side region 59 is a region adjacent to the central region 57 on the back side of the arc tube 3 and in contact with both the turning outermost peripheral part 51 and the next outer peripheral part 53. The thickness Hc of the central region 57 (the length in the direction perpendicular to the central surface) is made smaller than the thickness Hb of the back side region 59. Further, in the gap 55, a region adjacent to the front side of the central region 57 is not provided with an adhesive member, and is a light passage region that allows the irradiation light to pass through without being blocked.

  In addition, the central region 57 is a region that linearly connects locations where the turning outermost peripheral portion 51 and the next outer peripheral portion 53 are closest to each other (sometimes referred to as “two closest locations”). That is, the part located in the center area | region 57 of the connection member 7 is being made to adhere to two nearest parts and those vicinity. Therefore, the relative displacement between the turning outermost peripheral portion 51 and the next outer peripheral portion 53 is effectively limited while securing a light transmission region. Further, since the connecting member 7 is difficult to see from the irradiated surface side (downward), there is also an advantage that the appearance of the discharge lamp 1 is hardly affected.

Of the connecting member 7, the portion located in the central region 57 corresponds to the “central bridge portion”, and the portion located in the back surface region 59 corresponds to the “back bridge portion”. In the present embodiment, the central cross-linking portion and the back-side cross-linking portion are integrally formed.
(3) About the bridging width of the connecting member 7.
The length of the connecting member 7 in the turning direction (hereinafter sometimes referred to as “bridge width”) will be described.

In the present embodiment, as shown in FIG. 4, the bridging width is defined by an opening angle around the turning center D. That is, the bridging width is defined by the “opening angle θ” that is an angle formed by two straight lines N1 and N2 connecting each of the both end portions 61 of the connecting member 7 and the turning center D.
The opening angle θ is determined based on the results of two types of tests so that the arc tube 3 is not easily damaged even when an unscheduled load is applied to the arc tube 3. The two types of tests are “tensile force measurement test” and “strength test”. Based on the former result, how much strength of the discharge lamp 1 is necessary, that is, “required strength” is determined. Based on the result, the “opening angle θ” for achieving the required strength is determined.

(3-1) Tensile force measurement test.
The tensile force measurement test is a test for measuring how much force the subject pulls the discharge lamp 1 with the base 25 fixed to the lamp installed above. In this test, when the subject judges that the discharge lamp 1 is likely to be broken, the hand is released. That is, a user who does not know how to remove the discharge lamp 1 from the lamp tries to remove the discharge lamp 1 and pulls the arc tube 3 to the front side (downward). At that time, a force for pulling the arc tube 3 to the front side is a specific example of the “unscheduled load”. In addition, at the time of the said test, each nozzle | cap | die 25 is being fixed so that it may not move to radial direction and an axial direction.

In this test, the subject grasps the orthogonal position portion 65 that is a portion located on the straight line K in the outermost periphery 51 of the turning and pulls it to the front side (in this case, downward). This is because the orthogonal position portion 65 is located away from the holder 21 and the like, and is assumed to be easier to hold than other portions.
FIG. 6 and FIG. 7 show test result graphs and statistical values. In FIG. 6, a normal distribution is shown by a curve 66 as a reference value. It can be seen that the test results represented by bar graphs generally follow a normal distribution. Although the average value is 45.3 (N), it is a value obtained by adding a value obtained by multiplying the standard deviation (σ) by 3 to the average value in consideration of individual differences (described as “average value + 3σ” in the figure). 75.2 (N) is the “required strength” of the discharge lamp 1. That is, if the intensity of the discharge lamp 1 is 75.2 (N), even if the arc tube 3 is pulled to the irradiated surface side in the above situation, the probability of the arc tube 3 is statistically 99.87%. Damage can be prevented. The load obtained from the test result corresponds to the total value of the loads applied to the two orthogonal position portions 65.

(3-2) Breakage of the arc tube 3 Here, the behavior of the arc tube 3 when the load toward the irradiated surface side (front side) is applied to the orthogonal position portion 65 will be described. .
FIG. 8 shows a discharge lamp 63 in which the connecting member 7 is not provided. The discharge lamp 63 has the same configuration as the discharge lamp 1 except for the presence or absence of the connecting member 7. In the discharge lamp 63, how each part of the arc tube 3 is displaced is schematically shown. In FIG. 8, a pair of sockets 70 included in the lamp is schematically shown by a two-dot chain line, and the lamp body is not shown. Further, the pair of sockets 70 are fixed to the lamp and are not moved.

  In FIG. 8, it is assumed that a load in the direction from the back side to the front side is applied to each orthogonal position portion 65. Since the arc tube 3 is deformed by this load, this load is referred to as a “deformation load”. Normally, since the rear surface of the discharge lamp 1 is directed upward, the direction from the back side to the front side is expressed as “downward” or “downward”, and the direction from the front side to the back side is “upward” or “upward”. Sometimes expressed. Furthermore, a downward displacement may be expressed as “down” and an upward displacement as “up”.

Due to the deformation load, the two orthogonal position portions 65 are both displaced downward (in the direction from the back side to the front side in the drawing). At that time, the two outermost peripheral portions 51 and 52 are rotated about the straight line J described above.
The reason will be specifically described. In each of the two turning outermost peripheral portions 51 and 52, the tube end portion 17 is bridged to one of the two holders 21 by the adhesive member 31, and the tube end inner peripheral side portion 37 is bridged to the other. Specifically, the tube end portion 17 is cross-linked to the cylindrical portion 27 of one holder 21, and the tube end inner peripheral side portion 37 is cross-linked to the extending portion 33 of the other holder 21. That is, the two outermost peripheral portions 51 and 52 are formed in an annular shape by bridging the pipe end portion 17 and the pipe end inner peripheral side portion 37. However, since the rigidity of the adhesive member 31 is lower than that of the arc tube 3, the adhesive member 31 is easily bent at the bridging portion between the tube end portion 17 and the tube end inner peripheral side portion 37. In addition, since the silicone adhesive which comprises the adhesive member 31 is elastically deformed, the two turning outermost peripheral portions 51 are slightly rotated against the elastic force of the adhesive member 31.

That is, when the above-described unscheduled load is applied, it is difficult for the adhesive member 31 to sufficiently suppress the rotation of the turning outermost peripheral portions 51 and 52 around the straight line J.
When the turning outermost peripheral portion 51 (52) is rotationally displaced in the direction in which the orthogonal position portion 65 descends, the next outer peripheral portion 54 (53) continuous with the turning outermost peripheral portion 51 (52) also rotates in the same direction. Since it is displaced, the portion 67 adjacent to the inner peripheral side of the orthogonal position portion 65 is raised. The same rotational displacement is further transmitted to the inner periphery while the rotation angle becomes smaller, and is rotationally displaced in the direction in which the portion 69 adjacent to the inner periphery of the portion 67 descends. As a whole, the two swivel portions 15 are rotationally displaced in directions opposite to each other mainly at a portion on the outer peripheral side.

  However, the two swivel portions 15 are continuous with the tube center portion 11, and the two swivel portions 15 are restricted on the inner peripheral side from being rotationally displaced in directions opposite to each other. Therefore, the amount of rotation is larger on the outer peripheral side and smaller on the inner peripheral side. That is, the arc tube 3 is bent so that the two swivel portions 15 rotate in directions opposite to each other. If the deformation load is further increased and the deformable limit is exceeded by the bending of the arc tube 3, the arc tube 3 is damaged. In the above situation, the bent portion 19 is often damaged. As described above, when the connecting member 7 is not provided, there is a possibility that the arc tube 3 may be damaged due to incorrect handling.

In the present embodiment, it is assumed that the breakage of the arc tube 3 is that the glass tube as the constituent material of the arc tube 3 is broken. Therefore, breakage of the lead wire as a component part of the electrode or breakage of the phosphor layer applied in the arc tube 3 is not included in the breakage of the arc tube 3.
In addition, when the outer diameter ((alpha) of FIG. 14) of the arc_tube | light_emitting_tube 3 is small (for example, 200 mm or less), the above-mentioned damage does not arise easily. This is considered to be because the radius is small and the moment applied to the vicinity of the tube central portion 11 (for example, the bent portion 19) is small. On the other hand, when the outer diameter of the arc tube 3 is large (for example, 200 mm or more), the radius is large and the moment applied in the vicinity of the tube central portion 11 (for example, the bent portion 19) increases, so that the above-described breakage is likely to occur. Therefore, it is preferable to provide the connecting member 7 in the discharge lamp 1 in which the outer diameter of the arc tube 3 is 200 mm or more (the separation distance between the two orthogonal position portions 65 (β in FIG. 14 is 160 mm)).

The upper limit of the outer diameter is not particularly limited, but, for example, in order not to provide a connecting member on the inner peripheral side of the next outer peripheral portion 53, 54 of the arc tube 3, the outer diameter of the arc tube 3 is 500 mm or less. It is desirable that
The outer diameter of the arc tube 3 is a linear length dimension (“α” in FIG. 14) that connects both tube end portions 17 (specifically, end portions of the two swivel portions 15).

(3-3) Strength test.
The strength test is a test for measuring the magnitude of the load at which the arc tube 3 is broken by applying a load (deformation load) for displacing the two outermost peripheral portions 51 to the front side with the two bases 25 fixed. is there. In this test, loads having the same magnitude are applied to the two orthogonal position portions 65 for the same reason as in the tensile force measurement test. Specifically, two hooks are hooked on the orthogonal position portions 65 facing each other, the two hooks are pulled to the front side (irradiated surface side) with a string, and a predetermined load is applied.

The following test results show the total load (the total load applied to the two orthogonal position portions 65).
FIG. 9 shows a graph of the strength test results, and FIGS. 10 and 11 show numerical values of the strength test results. The data in which the opening angle θ is “0 degree” is data in a state where the connecting member 7 as the second bridging member is not provided.
In FIG. 9, the horizontal axis represents the opening angle θ, and the vertical axis represents the magnitude F of the load.

(3-2-1) Regarding the range where the opening angle θ is 0 to 6 degrees.
First, the results when the opening angle θ of the connecting member 7 is in the range of 0 ° to 6 ° will be described.
A polygonal line 71 indicates the average intensity of the discharge lamp 1. When the opening angle θ of the connecting member 7 is in the range of 0 ° to 6 °, the average intensity of the discharge lamp 1 increases as the opening angle θ increases. This average intensity is an average of four values (FIG. 11) obtained by four tests. Further, an error range 73 is given to the broken line 71.

  A polygonal line 75 is obtained by subtracting a value obtained by multiplying the standard intensity σ by three from the average intensity, and is a value for which the intensity is guaranteed with a probability of 99.87%, and is therefore referred to as “guaranteed intensity”. The opening angle θ is determined so that the guaranteed strength indicated by the broken line 75 is equal to or greater than the “required strength: 75.2 (N)” described above. That is, the polygonal line 75 is 75.2 (N) or more when the opening angle θ is 4 degrees or more.

  Then, by setting the opening angle θ of the connecting member 7 to 4 degrees or more, a user who does not know how to remove the discharge lamp 1 from the lamp pulls the arc tube 3 toward the irradiated surface side (front side) to discharge. In a situation where it is attempted to remove the lamp 1, it is possible to prevent the arc tube 3 from being damaged almost certainly. In addition, even if the opening angle θ is less than 4 degrees, the effect of making the arc tube 3 difficult to break occurs. However, if the angle is 4 degrees or more, the arc tube 3 can be more effectively prevented from being damaged, and the variation in strength at which the arc tube 3 is damaged can be reduced.

  Furthermore, if the opening angle θ of the connecting member 7 is increased, the arc tube 3 can be more reliably prevented from being damaged. For this reason, it is desirable to increase the opening angle θ of the connecting member 7 to 4.76 degrees or more and 5.95 degrees or more. On the other hand, there are disadvantages such as an increase in the amount of use of the connecting member 7, the connecting member 7 blocking the illumination light, and poor appearance. Therefore, the opening angle θ of the connecting member 7 is preferably 15 degrees or less, and more preferably 10 degrees or less and 7 degrees or less.

  In FIG. 10, the standard deviation σ of the data with the opening angle θ of 3.3 degrees is larger than the others. This is considered to be because the opening angle θ of the connecting member 7 is small and the length in the turning direction is about 7 mm, and the strength of the discharge lamp 1 is greatly changed by a slight difference in the amount of the connecting member 7. Therefore, it is considered that the variation can be reduced by increasing the opening angle θ.

(3-2-2) About the range where the opening angle θ is 7 degrees or more.
As can be seen from the broken line 71, the average intensity when the opening angle θ is 7 degrees is the same value as in the case of 6 degrees.
This is because the tube end 17 of the arc tube 3 comes off from at least one of the two holders 21 before the arc tube 3 is broken. In addition, although the adhesion area of the holder 21 and the pipe end part 17 is made comparatively large, the adhesive force between the silicone adhesive used for the adhesive member 31 and the resin holder 21 is a silicone adhesive. There is a situation in which the adhesive member 31 is easily detached from the inner peripheral portion of the holder 21 because it is weaker than the adhesive force between the glass 21 and the glass (the arc tube 3).

  For example, the tube end 17 can be removed by increasing the axial length of the holder 21 and the length of the tube end 17 inserted into the holder 21 to increase the bonding area. The pipe end 17 can be prevented from coming off. Thereby, for example, when the tube end portion 17 is prevented from coming out until the magnitude of the deformation load is 250 (N), the tube end portion 17 does not come out even if the opening angle θ is 7 degrees or more. It is thought that the test result that the load which 3 breaks increases increases.

  Based on such a fact, for example, by making the opening angle θ of the connecting member 7 less than 7 degrees, excessive use of the silicone adhesive used for the connecting member 7 can be prevented and the increase in cost can be suppressed. . That is, the opening angle θ of the connecting member 7 is set so that the load at which the arc tube 3 is broken is less than the load at which the holding of the tube end 17 by the holder 21 is released or slightly larger than the load at which the holding is released. By setting the upper limit, the increase in cost can be suppressed.

  By the way, it can be considered that it is preferable that the tube end portion 17 of the arc tube 3 comes out of the holder 21 rather than the arc tube 3 is broken. When the arc tube 3 is broken, glass fragments fall on the floor, which necessitates cleaning. On the other hand, if the tube end portion 17 is removed from the holder 21 before the arc tube 3 is broken, such cleaning work can be saved. Even if the arc tube 3 is broken or the tube end 17 is pulled out, the discharge lamp 1 cannot be used anyway. Therefore, it is preferable that cleaning is unnecessary. Therefore, in the strength test, the strength of the discharge lamp 1 does not change even when the opening angle θ is 6 degrees or more. However, in order to prevent the arc tube 3 from being damaged, the purpose is not limited to 7 degrees or more. Can be achieved.

Furthermore, it can be considered that the discharge lamp 1 of the present embodiment actively releases the holding of the tube end portion 17 when an unscheduled load is large.
In the strength test, since the average strength when the opening angle θ is 7 degrees is about 190 (N), the holding release load that is the load for releasing the holding of the tube end portion 17 by the holder 21 is about 190 (N). ing. When a load of less than about 190 (N) is applied to the arc tube 3 having an opening angle θ of 7 degrees or more, the holding of the tube end portion 17 is not released and the arc tube 3 is not damaged. On the other hand, when a load of about 190 (N) or more is applied, the holding of the tube end portion 17 is released, and the arc tube 3 is prevented from being damaged.

The magnitude of the holding release load is not limited to about 190 (N) and can be changed according to the purpose. For example, by reducing the bonding area between the holder 21 and the pipe end portion 17, the holding release load can be lowered (for example, 150 (N)), and the holding can be released with a smaller load.
When the connecting member 7 is not provided, the average intensity of the arc tube 3 is 51 (N), and therefore a deformation load exceeding 51 (N) and smaller than the holding release load of about 190 (N) is applied. If added, the arc tube 3 will be damaged before the holding of the tube end portion 17 is released.

(3-2-3) Regarding the influence of the outer diameter of the arc tube 3.
In this strength test, the arc tube 3 is damaged because the connecting member 7 is elastically deformed and the arc tube 3 is deformed beyond the limit of elastic deformation.
Here, the force acting on the orthogonal position portion 65 will be examined. First, a load Fd is applied in a direction in which the orthogonal position portion 65 is lowered. When the turning outermost peripheral portions 51 and 52 are rotated by the load, three types of deformation suppressing forces that suppress the rotation and suppress the deformation of the arc tube 3 are generated. The three types of deformation suppression forces are a deformation suppression force Fa due to the bending of the arc tube 3, a deformation suppression force Fb due to the elastic deformation of the adhesive member 31, and a deformation suppression force Fc due to the elastic deformation of the connecting member 7. These three types of deformation suppression forces Fa, Fb, and Fc are forces in a direction that raises the orthogonal position portion 65 (forces in a direction that suppresses the descent), and have a magnitude that acts on the orthogonal position portion 65.

  If the sum of the deformation restraining forces Fa, Fb, Fc is equal to the load Fd due to deformation within the limit that the arc tube 3 is elastically bent, the arc tube 3 will not be damaged. In this test, since the arc tube 3 and the adhesive member 31 are under the same conditions, changing the opening angle θ of the connecting member 7 changes the magnitude of the elastic force generated by the connecting member 7 and suppresses deformation. The magnitude of the force Fc can be changed. Since the connecting member 7 is elastically deformed (sheared) when the arc tube 3 is deformed, the spring constant (shear spring constant) of the connecting member 7 is changed by changing the opening angle θ of the connecting member 7. It is thought that you can.

That is, if the opening angle θ of the connecting member 7 is increased, the spring constant of the connecting member 7 increases, and the arc tube 3 is deformed when the load Fd is applied (specifically, the orthogonal position portion 65 and its inner periphery). Since the deformation suppression force Fc generated with respect to the relative displacement with the side portion 67 is increased, the deformation amount of the arc tube 3 can be reduced.
Furthermore, the case where the outer diameter of the arc tube 3 is changed will be examined.

  When the outer diameter of the arc tube 3 is large, the deformation suppression forces Fa and Fb generated with respect to the deformation of the arc tube 3 are smaller than when the outer diameter is small. That is, the turning outermost peripheral portions 51 and 52 are supported by the adhesive member 31 on (or in the vicinity of) the straight line J serving as the rotation axis thereof, and the more the orthogonal position portion 65 is away from the straight line J, the more the influence of the moment. This is because the deformation suppression force Fb that raises the orthogonal position portion 65 is reduced.

  Similarly, the deformation suppression force Fa due to the bending of the arc tube 3 is similarly affected by the moment. Specifically, the elastic force for eliminating the bending of the next outer peripheral portion 53 and the inner peripheral portion thereof causes the rotation of the turning outermost peripheral portion 51 and the like at the pipe end inner peripheral side portion 37 located on the straight line J. Although acting in the restraining direction, the deformation restraining force Fa that raises the orthogonal position portion 65 is reduced by the influence of the moment. Furthermore, as the outer diameter of the arc tube 3 increases, the peripheral length of the arc tube 3 increases, and in particular, the fact that the next outer peripheral portion 53 and the like and the inner peripheral portion thereof are easily bent with a small load is also affected.

  Therefore, it is considered that as the outer diameter of the arc tube 3 is increased, by increasing the cross-linking width by the connecting member 7, the deformation suppression forces Fa and Fb are less likely to be affected. For example, even when the deformation amount of the arc tube 3 is relatively small, the elastic force of the connecting member 7 that suppresses the deformation becomes relatively large, and the deformation is easily suppressed. In the present embodiment, the bridging width by the connecting member 7 is defined by the opening angle θ. Therefore, the bridging width by the connecting member 7 can be made appropriate in accordance with the outer diameter of the arc tube 3, and even when an unscheduled load as described above is applied to the turning outermost peripheral portions 51 and 52, the light emission is performed. The tube 3 can be made difficult to break.

(3-2-4) Regarding the influence of the position of the connecting member 7.
In the discharge lamp 1 of the present embodiment, the straight line K that is the reference straight line is orthogonal to the straight line J. This is because the turning outermost peripheral portions 51 and 52 rotate around the straight line J when a deformation load is applied as described above, and therefore, a portion as far as possible from the straight line J is required to suppress the rotation efficiently. This is because it is desirable to crosslink.

However, it is not indispensable that the straight line K intersects the straight line J at a right angle. If the straight line K intersects at a substantially right angle, it is considered that a result equivalent to that at a right angle is obtained.
Here, for the sake of simple modeling, consider the distance U between the intersection of the virtual semicircle centered on the turning center D and the straight line K and the straight line J. When the radius of the semicircle is R and the crossing angle between the straight line K and the straight line J is φ, the following relationship is obtained.

Separation distance U = R · sinφ (Formula 1-1)
The sine value is smaller than the others (for example, around 45 degrees) in the vicinity of 0 degrees, 90 degrees, 180 degrees, and the like, with respect to the angle change. Therefore, the influence of the change in the crossing angle in the vicinity of 90 degrees on the separation distance U is relatively small. For example, when the intersection angle φ is 80 degrees, the separation distance U is 0.985 · R.

As the separation distance U decreases, the deformation suppression force Fc decreases for the following two reasons. Here, a case where the intersection angle φ is 80 degrees will be described as an example.
First, as the distance U decreases, the moment around the straight line J generated by the elastic force of the connecting member 7 is slightly reduced to 0.985 times. Therefore, in order to generate the same moment as when the intersection angle φ is 90 degrees, the opening angle θ of the connecting member 7 may be increased by 1.015 times (= 1 / 0.985).

  Second, due to the decrease in the separation distance U, the relative displacement amount between the turning outermost peripheral portion 51 and the next outer peripheral portion 53 and the like is slightly reduced by 0.985 times at the place where the connecting member 7 is bridged. If it does so, the deformation amount of the connection member 7 will also become small and an elastic force will become small. Therefore, in order to generate the same elastic force as in the state where the crossing angle φ is 90 degrees, the shear spring constant of the connecting portion 7 may be increased by 1.015 times (= 1 / 0.985). That is, the opening angle θ of the connecting member 7 may be increased by 1.015 times (= 1 / 0.985).

  In order to compensate for the decrease in the deformation suppression force Fc due to the first and second reasons, the opening angle θ of the connecting member 7 is increased by 1.031 times (= 1.015 squared). It will be good. That is, the opening angle θ is increased by about 3%. Then, for example, when the intersection angle φ is 80 degrees, in order to obtain a deformation suppression force Fc equivalent to that when the intersection angle φ is 90 degrees and the opening angle θ is 5 degrees, the opening angle θ is set to 5.15 degrees. It can be said that the difference of 0.15 degrees can be regarded as an error.

The above simple model does not accurately reflect the influence of the change in the position of the connecting member 7 in the present embodiment. However, the turning outermost peripheral portion 51 and the like have a semicircular shape, and the separation distance of the connecting member 7 from the straight line J with respect to the change in the crossing angle when the crossing angle between the straight line K and the straight line J is around 90 degrees. The point that the change of is small is common.
Therefore, if the crossing angle between the straight line K and the straight line J is 80 degrees or more, the crossing angle is a right angle without changing the opening angle θ of the connecting member 7 or by slightly increasing the opening angle θ. It is thought that equivalent strength can be obtained. Therefore, in this embodiment, “substantially right angle” means that the intersection angle is 80 degrees or more (80 degrees to 90 degrees). Note that the “substantially right angle” may have an intersection angle of 85 degrees or more.

Thus, if the connecting member 7 can be provided so that the crossing angle between the straight line K and the straight line J is 80 degrees or more, the deformation of the arc tube 3 is effectively suppressed and the degree of freedom in the manufacturing process is increased. It is possible to suppress labor and cost during manufacturing.
Even if the crossing angle is less than 80 degrees, if the opening angle θ is set so as to compensate for the decrease in the relative displacement amount between the separation distance R and the turning outermost peripheral portion 51 and the next outer peripheral portion 53 and the like, It is considered that the same deformation suppression effect as that obtained when the crossing angle is 80 degrees or more can be obtained.

(3-2-5) About dimensions of each part of the discharge lamp 1.
In the discharge lamp 1 used in the test, the outer diameter α (see FIG. 14) of the arc tube 3 is 312 mm, and the separation distance β (see FIG. 14) between the two orthogonal position portions 65 is 250 mm (the outer peripheral side of the two connecting members 7). It is also the distance between the parts. Further, the number of turns of the two turning parts 15 is two, the tube diameter of the arc tube 3 is 20 mm, and the tube wall thickness is 1.0 mm. In addition, the arc tube 3 may be slightly (about 0.5 mm) smaller in tube diameter in the swivel radial direction by being bent. In the bent portion 19, the aspect ratio of the glass tube constituting the arc tube 3 is 0.8 (the tube diameter in the turning axis direction is 20 mm).

Further, a gap (for example, L in FIG. 5) between adjacent portions of the two swivel portions 15 is set to 6.5 mm (5.5 mm to 7.5 mm). Furthermore, the width and thickness of the connecting plate portion 23 are 17 mm and 2 mm, respectively.
The thickness Hc (FIG. 5) of the central region 57 of the connecting member 7 is 1 mm, and the thickness Hb of the back side region 59 is 8 mm. The “durometer hardness” of the cured silicone adhesive has a measurement result of “50-60” measured by a hardness meter (type A) in accordance with JIS6253. As the hardness meter, “Hardmatic HH-332 manufactured by Mitutoyo Corporation” is used.

The discharge lamp 1 shown in FIGS. 1 and 2 has an arc tube 3 with an outer diameter of 283 mm, and the outer diameter and the number of turns of the swivel unit 15 are different from those used in the test. Yes. However, the tube diameter, tube wall thickness, etc. of the arc tube 3 are the same. If the swivel part 15 of the discharge lamp 1 shown in FIGS. The dimensions are the same as those used.
(4) About the formation method of the connection member 7. FIG.
A method for forming the connecting member 7 will be described.

A jig having two side plate members that form the respective surfaces of both end portions 61 of the connecting member 7 and a bottom plate member that forms the front surface of the connecting member 7 is prepared. The front side portions of the two side plate members are connected by a bottom plate member.
The jig is installed in the bridge 55 which is a position located on the straight line K in the gap 55 between the turning outermost periphery 51 and the next outer periphery 53. A predetermined amount of silicone adhesive is poured into the gap surrounded by the jig and the outermost peripheral portion 51 and the next outer peripheral portion 53. The silicone adhesive adheres to both the outer peripheral surfaces of the turning outermost peripheral portion 51 and the next outer peripheral portion 53 when cured. Therefore, after the silicone adhesive is cured, the formation of the connecting member 7 is completed by removing the jig.

Note that the distance between the two side plate members is the distance at which the angle formed by the two straight lines connecting the two side plate members and the turning center D becomes the set opening angle when installed at the above location. Yes. Further, the length of the bottom plate member in the turning radial direction is set to be smaller than the distance L of the gap 55 between the turning outermost peripheral portion 51 and the next outer peripheral portion 53.
The bottom plate member may be replaced with a top plate member that connects the back sides of the two side plate members. In that case, the silicone adhesive is filled with the back side of the discharge lamp 1 facing down. Further, the length of the top plate member in the turning radial direction is larger than the distance L of the gap 55 between the turning outermost peripheral portion 51 and the next outer peripheral portion 53.

<Effect>
As described above, when the two orthogonal position portions 65 are pulled downward in a state where the discharge lamp 1 is attached to the lamp, the two turning portions 15 are rotationally displaced in directions opposite to each other. At this time, the rotational displacement amount in the vicinity of the pipe center portion 11 is small, and the rotational displacement amount of the turning outermost peripheral portion 51 is the largest. Further, the relative displacement amount between the orthogonal position portion 65 of the turning outermost peripheral portion 51 and the portion 67 adjacent to the inner peripheral side thereof is also the relative displacement amount between the portion 67 and the portion 69 adjacent to the inner peripheral side thereof. Compared to larger.

  In the present embodiment, the connecting member 7 limits the relative displacement (particularly, the relative displacement in the turning axis direction) between the turning outermost peripheral portion 51 (52) and the next outer peripheral portion 53 (54). Therefore, even when the above-described unscheduled load is applied, the rotational displacements in the opposite directions with the straight line J of the two turning portions 15 (specifically, the turning outermost peripheral portions 51 and 52) as the rotation axis are suppressed, The deformation amount of the arc tube 3 can be made relatively small. Therefore, it is possible to make the arc tube 3 difficult to break.

  Moreover, since the connection member 7 is provided on the above-mentioned straight line K, it effectively limits the relative rotational displacement between the turning outermost peripheral part 51 and the next outer peripheral part 53 turning on the inner peripheral side thereof. Can do. Since the turning outermost peripheral portion 51 and the next outer peripheral portion 53 are rotationally displaced around the straight line J as described above, the portion farthest from the straight line J is bridged, so that the relative relative force can be reduced with a smaller force than other portions. This is because the rotational displacement can be limited.

  In the present embodiment, the members (the members having the same functions as the connecting member 7 and the adhesive member 31) that bridge portions adjacent to each other on different turns in the arc tube 3 are the turning outermost peripheral portions 51 and 52. Are provided only between the outer peripheral portions 53 and 54 (connecting members 7 and 31) and not provided on the inner peripheral side of the next outer peripheral portions 53 and 54 (for example, between the portion 67 and the portion 69). Is not provided). This is because the deformation of the arc tube 3 can be effectively suppressed by providing the connecting member 7 as the second bridging member in addition to the adhesive member 31 as the first bridging member.

[Modification]
<Bridged member including reinforcing member>
In the said embodiment, the connection member 7 was comprised only with the silicone adhesive agent. On the other hand, as shown in FIG. 12, the connecting member 101 as the second bridging member can be constituted by a reinforcing member 103 and an adhesive member 105. The length of the reinforcing member 103 in the turning direction is the same as that of the connecting member 7. Further, the reinforcing member 103 is curved along the turning outermost peripheral portion 51 (52) and the like. By embedding the reinforcing member 103 in the adhesive member 105, the rigidity of the connecting member 101 is increased, and rotational displacements in opposite directions with the straight line J of the turning outermost periphery 51, 52 as the rotation axis are effectively suppressed. Can do.

The reinforcing member 103 can be a highly rigid member, for example, made of metal (stainless steel, steel, etc.), ceramic, glass, high strength resin (engineering plastic, etc.), and the like. For the adhesive member 105, for example, a resin adhesive such as a silicone resin adhesive or an epoxy resin adhesive can be used.
In addition, the length of the reinforcing member 103 can be made shorter than the connecting member 7 or the reinforcing member 103 can be divided into a plurality of parts. Further, the reinforcing member 103 may be hollow, the reinforcing member 103 may penetrate to the front side of the adhesive member 105, or the adhesive member 105 may be divided into two with the reinforcing member 103 interposed therebetween.

<Bridged member including plate-like member>
Furthermore, as shown in FIG. 13, the connecting member 111 as the second bridging member can be configured by a plate-like member 113 and an adhesive member 115. The plate-like member 113 extends up to the center lines O and P with the turning outermost peripheral part 51 and the next outer peripheral part 53 in the turning radial direction. Further, a curved surface portion 117 that is curved along the outer peripheral surface of the turning outermost peripheral portion 51 and the like is bonded to the turning outermost peripheral portion 51 and the like by an adhesive member 115.

  The connecting member 111 can increase the rigidity of the plate-like member 113, and can effectively suppress rotational displacements in opposite directions with the straight line J of the turning outermost periphery 51, 52 as the rotation axis. The plate-like member 113 has a length in the radial direction longer than the separation distance L between the turning outermost peripheral portion 51 and the next outer peripheral portion 53. The plate-like member 113 has a shape bent in a V shape, but instead of the plate-like member 113, a triangular prism-like member or a member having another shape can be used.

The plate-like member 113 can be a highly rigid member, for example, made of metal (stainless steel, steel, etc.), ceramic, glass, relatively strong resin (engineering plastic, etc.), etc. it can. For example, the adhesive member 115 may be an adhesive such as a resin adhesive or an inorganic adhesive.
<Bridged member containing filler>
Although illustration is omitted, as the second cross-linking member, a fiber-reinforced adhesive member that is a cross-linking member having the same shape as the connecting member 7 may be formed by a resin-based adhesive (for example, silicone adhesive) in which fibers are mixed. it can. The fiber can be, for example, glass fiber, resin fiber, carbon fiber, or the like. By mixing the fiber with the silicone adhesive, the rigidity of the cross-linking member is increased, and the deformation of the arc tube 3 can be effectively suppressed.

<Others>
(1) Although the straight line K is orthogonal to the straight line J in the above-described embodiment, the crossing angle may be other than a right angle. For example, when the crossing angle is 60 degrees, the effect of suppressing the deformation of the arc tube 3 is lower than when the crossing angle is 90 degrees. Therefore, the effect can be increased by increasing the bridge width (opening angle θ). It is desirable to compensate for the decline. The crossing angle between the straight line K and the straight line J is preferably 45 degrees or more, and more preferably 60 degrees or more, 75 degrees or more, and close to 90 degrees.

(2) In the above embodiment, the center of the connecting member 7 is positioned on the straight line K, but it may be shifted in the turning direction. Specifically, the both ends 61 of the connection member 7 should just be installed so that the straight line K may be pinched | interposed.
(3) Although the connecting member 7 is provided in the gap 55 between the orthogonal position portion 65 and the portion 67 in the above embodiment, it can be provided in other portions. For example, it can be provided between the portion 67 and the portion 69.

(4) The connecting member 7 may be formed of an adhesive other than a silicone adhesive, and may be formed of a resin adhesive such as an epoxy resin, for example.
(5) The outer shape of the arc tube 3 is not limited to a flat disk shape, and may be a conical shape, for example. In that case, the two swivel portions are formed in a shape that is swirled in a spiral shape while being displaced in a direction that passes through the swivel center and intersects (for example, orthogonal to) the swivel radial direction.

  (6) In the said embodiment, although the pipe end part 17 was formed along the turning direction, you may be made to extend in the direction different from a turning direction. For example, the arc tube is bent at the outer peripheral side end of the swivel part, and the tube end part has a shape extending toward the outer peripheral side in the swivel radial direction or a shape extending toward the back side of the arc tube. it can. When the tube end is long, a part of the tube end may protrude from the holder.

  (7) In the above-described embodiment, the gaps in the arc tube 3 adjacent to each other in the turning radial direction are made equal, but they may not be equal. For example, the gap on the outer peripheral side may be made larger or smaller than that on the inner peripheral side.

  The discharge lamp of the present invention can be used for a discharge lamp provided with a double-circular luminous tube in a plan view that swirls around a central portion of the tube.

1: discharge lamp 3: arc tube 5: tube end connector 7: connecting member (second bridging member)
11: Pipe center part 15: Swivel part 17: Pipe end part 21: Holder 25: Base 31: Adhesive member (first bridging member)
37: Pipe end inner peripheral side 51, 52: Turning outermost peripheral part 53, 54: Next outer peripheral part 61: Both end parts 65: Orthogonal position part 70: Socket 101: Connecting member 111: Connecting member D: Turning center

Claims (7)

An arc tube having a shape that swirs one or more rounds in a double spiral shape in plan view toward each of both tube end portions with the tube center portion as a turning center;
A pair of first tubes that bridge each of the tube end portions of the arc tube and a portion of the arc tube that pivots on the inner peripheral side of each of the tube end portions to limit the relative displacement thereof. 1 bridging member;
Two members that bridge the turning outermost peripheral part of the arc tube and the part turning on the inner peripheral side thereof to restrict relative displacement thereof, both of the pair of first bridging members in the turning direction And a pair of second bridging members provided at two locations on a reference straight line that is a straight line passing through the turning center in plan view.   2. The discharge lamp according to claim 1, wherein an angle of intersection between the reference straight line and a straight line connecting the pair of first bridging members is 45 degrees or more.   The discharge lamp according to claim 1, wherein the reference straight line is substantially orthogonal to a straight line connecting the pair of first bridging members. The distance between the both ends in the turning direction of the second bridging member is an angle formed by two straight lines connecting the both ends and the turning center in a plan view, being 4 degrees or more and 15 degrees or less. 3. The discharge lamp according to 3. The second bridging member is
A center that is provided between the adjacent portions along the central cross section that is a plane that connects the center lines in the radial direction of the portions adjacent to each other in the radial direction of the arc tube, and is bisected by the central cross section. A bridging part;
It is constituted by a back side bridge portion provided between the adjacent portions adjacent to the central bridge portion on the back side that does not face the irradiated surface,
The discharge lamp according to any one of claims 1 to 4, wherein a thickness of the central cross-linking portion in a direction perpendicular to the central cross section is smaller than a thickness of the back-side cross-linking portion. And a pair of tube end holding members that hold each of the tube end portions and are connected to the lamp to restrict displacement in the tube radial direction,
With the pair of tube end holding members connected to the lamp, the straight line connecting the pair of first bridging members at the outermost periphery of the turning and two points on the orthogonal line orthogonal to the turning center are respectively covered. In the case where the load that deforms the arc tube by displacing to the irradiation surface side is a deformation load,
The pair of pipe end holding members release the holding of at least one of the pipe end portions when the deformation load value is equal to or greater than a set value;
When the two places are not cross-linked by the pair of second cross-linking members, the value of the deformation load at which the arc tube breaks is not more than the set value,
The value of the deformation load at which the arc tube is damaged becomes larger than the set value when the two places are cross-linked by the pair of second cross-linking members. The discharge lamp described in. 6. The tube end holding member according to claim 1, further comprising: a pair of tube end holding members that hold each of the tube end portions and are connected to a lamp and are limited in displacement in the tube radial direction. Discharge lamp.

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