JP2014086371A - High-pressure discharge lamp and projector using the high-pressure discharge lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp capable of being easily assembled.SOLUTION: The high-pressure discharge lamp includes: a coil 51a of a conductor 51; and an extension line 51c which extends toward the central axis J2 of the coil 51a being inclined in a direction away from the coil 51a with respect to a virtual plane S1 perpendicular to the central axis J2 of the coil 51a with a front end of the extension line 51c being in contact with or close to the surface of a portion AR of a sealing part 11 where a metal foil 23 is sealed therein.

Description

  The present invention relates to a high-pressure discharge lamp and a projector using the high-pressure discharge lamp, and particularly relates to facilitation of assembly.

  Conventionally, in order to lower the starting voltage of the high-pressure discharge lamp, a conductor for assisting the starting of the high-pressure discharge lamp is attached to a part of the outer peripheral surface of the arc tube (see Patent Document 1). Then, when starting the high-pressure discharge lamp, the discharge space in the arc tube is irradiated with ultraviolet rays caused by creeping discharge or corona discharge generated between the tip of the conductor and the outer surface of the arc tube. Photoelectrons increase and electric discharge tends to occur between the electrodes.

14A and 14B are views for explaining a process of attaching the conductor 1051 to the arc tube 3 in the high pressure discharge lamp 1001 according to the conventional example.
As shown in FIG. 14A, the conductor 1051 is connected to the spirally formed wire ring part 51a, the extended part 1051b extending from one end of the wire ring part, and the other end of the wire ring part 51a. And an extension line portion 1051 c that is provided and has a tip contacting the surface of the arc tube 3. Here, the extended wire portion 1051c extends in a direction orthogonal to the central axis J2 of the wire ring portion 51a. And, in order to make sure that the tip of the extension line part 1051c and the outer surface of the sealing part 11 of the arc tube 3 are in contact with each other, in a virtual plane including the tip of the extension line part 1051c and the central axis J2 of the wire ring part 51a, A distance in a direction perpendicular to the central axis J2 between the tip and the portion of the wire ring portion 51a that is located on the opposite side of the tip side from the center axis J2 B0 is slightly shorter than the diameter r of the sealing portion 11.

  When the conductor 1051 is attached to the arc tube 3, the sealing portion 11 of the arc tube 3 is connected from the side continuous with the extension portion 1051b of the wire ring portion 51a along the central axis J2 of the wire ring portion 51a of the conductor 1051. It inserts inside the wire ring part 51a (refer the arrow in Fig.14 (a)).

JP 2009-181927 A

  By the way, when the conductor 1051 is attached to the arc tube 3, since the distance B0 is slightly shorter than the diameter R of the sealing portion 11, the tip of the extension line portion 1051c is caught by the end surface 11a of the sealing portion 11. Sometimes. And as shown in FIG.14 (b), when the arc tube 3 is pushed in along the central axis J2 of the wire ring part 51a in the state where the front-end | tip of the extended line part 1051c was hooked on the end surface 11a of the sealing part 11, line There is a possibility that the ring portion 51a may be deformed.

Conventionally, an operator who assembles the high-pressure discharge lamp 1001 holds the wire ring portion 51a in a state where the diameter of the wire ring portion 51a is widened so that the end of the extension wire portion 1051c is not caught by the end surface 11a of the sealing portion 11. However, it is necessary to devise such as inserting the arc tube 3 into the wire ring portion 51a, and the assembling work is complicated.
The present invention has been made in view of the above-described reasons, and an object thereof is to provide a high-pressure discharge lamp that can be easily assembled.

  The high-pressure discharge lamp according to the present invention includes a light emitting portion having a discharge space formed therein, a light emitting tube having a pair of sealing portions extending in a direction away from the light emitting portion, an electrode, and the discharge space in the electrode. A pair of electrode structures having a metal foil connected to the other end opposite to the one end located inside and disposed in a state where at least the metal foil is sealed inside each of the pair of sealing portions; The spiral wire ring wound around the outer periphery of one sealing portion and the electrode structure extending from one end of the wire ring portion and bypassing the outer periphery of the light emitting portion and sealed by the other sealing portion A high-voltage discharge lamp having a starting voltage reducing conductor having an extension portion connected to the center of the wire ring portion at the other end of the wire ring portion of the conductor toward the central axis of the wire ring portion. Inclined in the direction away from the wire ring part with respect to the orthogonal virtual plane orthogonal to the axis Extension part is continuously provided, the tip of the extension portion is in contact with or close to the surface of the site where the metal foil is sealed within the sealing portion of the one.

  According to this configuration, the extension line portion is inclined in a direction away from the wire ring portion with respect to the orthogonal virtual plane orthogonal to the center axis of the wire ring portion while facing the center axis of the wire ring portion. Thus, when the sealing portion of the arc tube is inserted into the inside of the wire ring portion from the other end side of the conductor wire ring portion, the wire ring portion opening seen from the oblique direction with respect to the central axis is seen from the central axis direction. Can be larger. Furthermore, when a force is applied in the direction of the central axis of the wire ring part to the extension line part from a state in which the end face in the extending direction of the sealing part is in contact with the side surface of the extension line part, a part of the force lines the extension line part Escape in the direction away from the center axis of the ring part, and the distance between the tip of the extension line part and the inside of the wire ring part facing each other across the center axis of the wire ring part is widened. The tip of the part is not easily caught on the end face in the extending direction of the sealing part. Therefore, the operator who performs the assembling work of the high-pressure discharge lamp can easily perform the work of inserting the arc tube into the wire ring portion, so that the assembling can be facilitated accordingly.

1 is a diagram illustrating a configuration of a high-pressure discharge lamp according to Embodiment 1. FIG. 3 is an enlarged view of an electrode portion according to Embodiment 1. FIG. About the high pressure discharge lamp concerning Embodiment 1, (a) is a side view, (b) is an arrow view of the XX cross section in (a), (c) is the part enclosed with the dashed-dotted line in (a). It is an enlarged view. About the high-pressure discharge lamp concerning a comparative example, (a) is a side view, (b) is an enlarged view of the part enclosed by the dashed-dotted line in (a). 1 is a partially broken perspective view of a lamp unit using a high-pressure discharge lamp according to Embodiment 1. FIG. About the conductor which concerns on Embodiment 1, (a) is a perspective view, (b) is a side view. (A) is a schematic side view about the conductor which concerns on Embodiment 1, (b) is the figure which showed typically the relationship between the shape of a conductor, a front-end | tip, a 1st site | part, and a 2nd site | part. It is a figure which shows the 3rd distance dependence of the value of (1st distance) / (2nd distance) about the conductor which concerns on Embodiment 1. FIG. 5 is a diagram for explaining an assembly process of the high-pressure discharge lamp according to Embodiment 1. FIG. It is an arrow directional view of the XX section in Drawing 9 (b) and (c) about the high-pressure discharge lamp concerning Embodiment 1. FIG. 6 is a perspective view of a projector according to a second embodiment. FIG. 6 is a perspective view of a projector according to a second embodiment. It is sectional drawing of the high pressure discharge lamp which concerns on a modification. It is a figure for demonstrating the process of attaching a conductor to an arc_tube | light_emitting_tube about the high pressure discharge lamp which concerns on a prior art example.

<Embodiment 1>
<1> Configuration FIG. 1 shows a side view of a high-pressure discharge lamp 1 according to the present embodiment.
A high-pressure discharge lamp (hereinafter simply referred to as “lamp”) 1 includes an arc tube 3, a pair of electrodes 7 and 9, a pair of metal foils 23 and 25, a pair of external lead wires 27 and 29, and a conductor. 51. Here, the electrodes 7 and 9, the metal foils 23 and 25, and the external lead wires 27 and 29 constitute a pair of electrode structures.

<Luminescent tube>
The arc tube 3 is made of a translucent material such as quartz glass. The arc tube 3 has a light emitting portion 6 having an outer shape of a spheroid and a discharge space 5 formed therein, and a cylindrical sealing portion 11 extending in a direction away from both sides in the longitudinal direction of the light emitting portion 6. , 13. Here, the center axis J1 is common to the spheroid shape of the light emitting portion 6 and the cylindrical shape of the sealing portions 11 and 13. Hereinafter, the central axis J1 is referred to as the central axis J1 of the arc tube 3. Inside the discharge space 5 is mercury, which is a luminescent material, a rare gas such as argon, krypton, or xenon that functions as a starting aid, and iodine or bromine required to realize a halogen cycle in the discharge space 5. Etc. are enclosed. As an example, the enclosed amount of mercury is in the range of 150 mg / cm ^{3 to} 650 mg / cm ³ , the enclosed amount of argon (25 ° C.) is in the range of 0.01 MPa to 1 MPa, and the enclosed amount of bromine is 1 × 10 ^-10 mol / cm ³ or more and 1 × 10 ⁻⁴ mol / cm ³ or less, preferably 1 × 10 ⁻⁹ mol / cm ³ or more and 1 × 10 ⁻⁵ mol / cm ³ or less Is done.

<Electrode>
The electrodes 7 and 9 are rod-shaped, and one end part is located in the discharge space 5 formed inside the light emitting part 6. Further, the first and second electrodes 7 and 9 are opposed to each other in a state where they are separated by a predetermined distance (hereinafter referred to as “interelectrode distance”) L in the discharge space 5. From the viewpoint of improving the light extraction efficiency of the lamp 1, the interelectrode distance L is more preferably set in the range of 0.5 mm to 1.5 mm. The electrodes 7 and 9 are made of tank stainless steel.

An enlarged view of a part of the electrodes 7 and 9 is shown in FIG.
The electrodes 7 and 9 include elongated small-diameter portions 71 and 91 and large-diameter portions 72 and 92 that are continuous on opposite sides in the longitudinal direction of the small-diameter portions 71 and 91 and have a larger diameter than the small-diameter portions 71 and 91. The large diameter portions 72 and 92 have tips 73 and 93 located on the opposite side to the side continuous with the small diameter portions 71 and 91, respectively. Here, the electrodes 7 and 9 are formed by melting the tip of the rod-shaped member and a part of the coil in a state where the coil is wound around the tip of the rod-shaped member. And the small diameter parts 71 and 91 consist of the site | parts by which the coil in the said rod-shaped member is not wound, and the large diameter parts 72 and 92 are the site | parts which are not melt | dissolved among the coils, and the rod-shaped member located in the center part. It consists of a part. The front ends 73 and 93 are formed of a portion melted and formed in a substantially hemispherical shape. Further, protrusions 74 and 94 are formed at the tips 73 and 93 due to the halogen cycle during lighting of the lamp 1. Specifically, during the lighting of the lamp 1, tungsten constituting the electrodes 7, 9 evaporates from a part of the electrodes 7, 9 to become a halogen compound, and then the halogen compound is transferred to the tips 73, 9 of the electrodes 7, 9. When returning to the vicinity of the top of 93, the protrusions 74 and 94 are formed by depositing as tungsten. The protrusions 74 and 94 are formed during an aging test that is a part of the manufacturing process of the lamp 1. The interelectrode distance L corresponds to the distance between the protrusions 74 and 94.

  The tips 73 and 93 of the electrodes 7 and 9 are not limited to a substantially hemispherical shape, and may be, for example, a substantially spherical shape or a substantially conical shape. Further, the method of forming the tips 73 and 93 is not limited to the method of forming the tips of the rod-shaped members and a part of the coil by melting. Alternatively, a method may be used in which a processed member is prepared and the member is fixed to the tip of a rod-shaped member.

<Metal foil>
As shown in FIG. 1, the metal foils 23 and 25 are sealed in the sealing portions 11 and 13, respectively, and connected to the other end portions of the first and second electrodes 7 and 9. The metal foils 23 and 25 are made of a metal such as molybdenum. The metal foils 23 and 25 and the electrodes 7 and 9 are connected by, for example, welding.

<External lead wire>
One end portions of the external lead wires 27 and 29 are connected to the metal foils 23 and 25, respectively. External lead wires 27 and 29 are made of a metal such as molybdenum. The connection between the one end portion of the external lead wires 27 and 29 and the metal foils 23 and 25 is performed by, for example, welding. The other end portions of the external lead wires 27 and 29 are led out from the sealing portions 11 and 13 and are electrically connected to an external power source (not shown).

<Conductor>
The conductor 51 is for reducing a voltage necessary for starting the lamp 1 (hereinafter referred to as “starting voltage”).
The conductor 51 is made of, for example, a linear member having an outer diameter of 0.1 mm or more and 2.0 mm or less. As a material constituting the conductor 51, for example, a metal material such as an alloy of iron and chromium or molybdenum can be employed. In the present embodiment, an example in which the cross-sectional shape of the conductor 51 is circular will be described. However, the cross-sectional shape is not limited to a circular shape, and may be a polygon or the like. Moreover, the conductor 51 does not need to consist of a linear member as a whole, it is sufficient that at least the portion that contacts the outer surface of the sealing portion 11 is linear, and the other portion is, for example, a belt plate shape. May be.

The conductor 51 includes a wire ring part 51a, an extension part 51b, and an extension line part 51c.
The wire ring portion 51 a is formed in a spiral shape and is disposed outside the sealing portion 11. The central axis J2 of the wire ring portion 51a is parallel to the central axis J1 of the arc tube 3. Further, the wire ring portion 51a goes around the sealing portion 11 for 2.5 turns. The number of turns of the wire ring portion 51a is not limited to 2.5 turns, and may be, for example, 3 turns or more, and may be greater than 0.5 turns and less than 2.5 turns.

  The extending portion 51b has a bent portion 51d that is bent so that one end is continuous with one end of the wire ring portion 51a and straddles the light emitting portion 6, and the other end of the bent portion 51d extends along the outer surface of the sealing portion 13. The main portion 51e extends to the lead wire 29. Here, the tip of the main portion 51 e is wound around the external lead wire 29. Thereby, the conductor 51 and the electrode 9 are electrically connected via the external lead wire 29 and the metal foil 25.

  The extension wire portion 51c extends from the other end of the wire ring portion 51a toward the central axis J2 of the wire ring portion 51a, and the tip is a portion where the metal foil 23 is located inside the sealing portion 11 (the portion in FIG. 1). (See AR). Here, “part AR” refers to a virtual plane S2 including one end edge in the longitudinal direction of the metal foil 23 and perpendicular to the central axis J1 of the arc tube 3 in the sealing portion 11, and in the longitudinal direction of the metal foil 23. This corresponds to a portion located in a region sandwiched by a virtual plane S3 including the other end edge and orthogonal to the central axis J1 of the arc tube 3.

In addition, the tip of the extended wire portion 51c includes the other end of the wire ring portion 51a and is opposite to the wire ring portion 51a side with respect to a virtual plane (orthogonal virtual plane) S1 orthogonal to the central axis J2 of the wire ring portion 51a. It is inclined to be located on the side.
By the way, the extension line part 51c of the conductor 51 is brought into contact with a part of the outer surface of the sealing part 11 other than the part AR where the metal foil 23 is located, for example, a part where the electrode 7 and the external lead wire 27 are located. Conceivable.

However, in this case, there is a slight gap between the sealing portion 11 and the electrode 7 or the external lead wire 27, and accordingly, the tip of the electrode 7, the external lead wire 27, and the extension wire portion 51c. A strong electric field is hardly generated between the two.
Therefore, compared with the case where the extended line portion 51c of the conductor 51 is in contact with the part AR, it is difficult to obtain the effect of reducing the starting voltage of the lamp 1.

Here, FIG. 3A shows an enlarged side view of a part of the lamp 1, FIG. 3B shows an arrow view in the XX section in FIG. 3A, and FIG. FIG. 3C shows an enlarged view of a portion surrounded by a dashed line in FIG. In FIG. 3B, a part of the conductor 51 and the light emitting unit 6 are not shown.
In FIG. 3A, the inclination angle (angle formed by S1 and the straight line VP) of the extended line portion 51c with respect to the virtual plane S1 when viewed from the side surface of the lamp 1 may be set to be greater than 0 ° and less than 90 °. However, it is preferably 15 ° to 75 °, more preferably 25 ° to 60 °. For example, in the present embodiment, in the plan view of the wire ring portion 51a viewed from the direction parallel to the virtual plane S1, the straight line UP and the straight line VP form when the angle formed by S1 and the virtual straight line UP is 8 °. By tilting the angle to be 45 °, the tilt angle can be set to 37 °.

  In the present embodiment, the example in which the tip of the extension line part 51c is in contact with the outer surface of the sealing part 11 is described. However, the present invention is not limited to this, and the tip of the extension line part 51c is It may be arranged close to only one point on the outer surface of the sealing portion 11. Here, “proximity” means that the shortest distance between the tip of the extension line portion 51 c and the outer surface of the sealing portion 11 is 0.3 mm or less.

Moreover, in the conductor 51, the front-end | tip V of the extension line part 51c is located in the virtual plane containing the central axis J2 of the wire ring part 51a and the said other end P of the wire ring part 51a.
Here, the function of the conductor 51 in the lamp 1 will be described.
First, when a high-frequency voltage (for example, a high-frequency voltage selected from a frequency range of 10 kHz to 10 MHz) is applied between the electrodes 7 and 9, the conductor 51 electrically connected to the electrode 9 is extended. The glass constituting the sealing part 11 interposed between the line part 51c and the metal foil 23 is dielectrically polarized. At this time, electric field concentration occurs at a location where the extended line portion 51 c of the conductor 51 is in contact with the outer surface of the sealing portion 11. Then, electrons are emitted from the tip of the extended line portion 51c. At this time, even if the voltage applied between the extension line portion 51c and the metal foil 23 is 1.5 kV to 2.0 kV, for example, electrons are emitted from the extension line portion 51c. Then, the emitted electrons ionize nitrogen in the air interposed between the extended line portion 51 c and the outer surface of the sealing portion 11, thereby causing creeping discharge and corona discharge. At this time, ultraviolet rays having a wavelength of 100 nm to 400 nm are radiated from the air interposed between the extension line portion 51 c and the outer surface of the sealing portion 11. The ultraviolet rays are transmitted through the sealing portion 11 and irradiated onto a luminescent material or the like enclosed in the discharge space 5, thereby increasing the photoelectrons in the discharge space 5. As described above, the increase of the photoelectrons in the discharge space 5 promotes the dielectric breakdown between the electrodes 7 and 9, and as a result, the starting voltage of the lamp 1 decreases.

Next, the lamp 1 according to the present embodiment and the lamp 1001 according to the comparative example will be described in comparison.
FIG. 4A shows an enlarged view of a part of the lamp 1001 according to the comparative example, and FIG. 4B shows an enlarged view of a portion surrounded by a dashed line in FIG. 4A.
As shown in FIG. 4A, the lamp 1001 according to the comparative example is different from the lamp 1 according to the first embodiment in the shape of the extended portion 1051b of the conductor 1051 and the shape of the extended line portion 1051c. 4 (a) and 4 (b), the same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

  As shown in FIG. 4A, in the lamp 1001 according to the comparative example, the extending direction of the extension line portion 1051c of the conductor 1051 is orthogonal to the central axis J1 of the arc tube 3. In other words, the extended line portion 1051c includes the other end of the wire ring portion 51a and extends in a virtual plane S1 orthogonal to the central axis J2 of the wire ring portion 51a. The extension line portion 1051c has an elongated columnar shape, and a surface orthogonal to the central axis of the extension line portion 1051c is formed at the tip. As shown in FIG. 4B, the extension line portion 1051c is formed. The surface formed at the tip of the sealing member 11 is substantially in surface contact with the outer surface of the sealing portion 11.

As shown in FIG. 4, in the lamp 1001 according to the comparative example, the extending portion 1051b extends substantially linearly, and the portion of the extending portion 1051b that faces the sealing portion 13 is the sealing portion. 13 at a position spaced from the outer surface.
On the other hand, as shown in FIG. 3A, the extending part 51b of the lamp 1 according to the present embodiment is set so that the bent part 51d straddles the light emitting part 6, and the main part 51e is sealed. Arranged along the outer surface of the portion 13. Thereby, the space required for housing the lamp 1 can be made smaller than that of the lamp 1001 according to the comparative example.

FIG. 5 shows a partially broken perspective view of the lamp unit 46 using the lamp 1 according to the present embodiment.
The lamp unit 46 includes the lamp 1, a bottomed cylindrical base 42 attached to the sealing portion 11 of the lamp 1, and a substantially bowl-shaped reflecting mirror 44 on which the lamp 1 is disposed.
A power connection terminal 42 a that is electrically connected to the external lead wire 27 of the lamp 1 protrudes from the bottom of the base 42.

  The inner surface of the reflecting mirror 44 is formed, for example, in a parabolic shape, and a multilayer interference film or the like is deposited thereon. A through hole 44a is provided at a substantially central portion of the reflecting mirror 44, and a base 42 is disposed inside the through hole 44a. The base 42 is fixed to the reflecting mirror 44 with an adhesive 48. Here, the central axis J 1 of the arc tube 3 of the lamp 1 substantially coincides with the optical axis of the reflecting mirror 44.

Further, a through hole 44 b is provided in a part near the peripheral edge of the reflecting mirror 44, and a power supply line 49 connected to the external lead wire 29 of the lamp 1 is inserted.
In the lamp unit 46 having the configuration shown in FIG. 5, the sealing portion 11 side of the arc tube 3 is arranged inside the base 42, but the arrangement of the arc tube 3 is not limited to this. The sealing part 13 side may be disposed inside the base 42. In this case, the lamp 1 includes the sealing portion 13 and the extending portion 51b compared to the lamp 1001 according to the comparative example shown in FIG. 4 because the extending portion 51b of the conductor 51 is disposed along the outer surface of the sealing portion 13. The space required to store the outlet 51b is small. Therefore, the lamp unit using the lamp 1 can be made smaller in size than the lamp unit using the lamp 1001 according to the comparative example.

<2> Method for Assembling Lamp Next, a method for assembling the lamp 1 will be described. Here, the process of attaching the conductor 51 to the arc tube 3 will be described in particular.
First, details of the conductor 51 will be described.
A perspective view of the conductor 51 before being attached to the arc tube 3 is shown in FIG. 6A, and a partially enlarged view of the conductor 51 is shown in FIG.

As shown in FIG. 6A, the main portion 51e of the conductor 51 before being attached to the arc tube 3 extends linearly. As shown in FIG. 6B, the extending direction of the main portion 51e is inclined in a direction away from the central axis J2 by an angle φ with respect to the central axis J2 of the wire ring portion 51a.
Further, the tip in the direction in which the first distance A, which is the shortest distance between the imaginary straight line L1 connecting the tip V of the extension line portion 51c and the second part W, and the first part U is orthogonal to the central axis J2. It is longer than the second distance B between V and the first portion U. Here, in the cross section obtained by cutting the second portion W at a virtual plane including the central axis J2 of the wire ring portion 51a, the tip V of the extended wire portion 51c, and the other end P of the wire ring portion 51a, the wire ring portion This corresponds to a portion closest to one end of the wire ring portion 51a that continues to the extending portion 51b among a plurality of portions that are arranged on the same side as the side on which the tip V is located across the central axis J2. The virtual straight line L1 is inclined by an angle θ with respect to the central axis J2 of the wire ring portion 51a.

  When the sealing portion 11 of the arc tube 3 is inserted inside the wire ring portion 51a, the first distance A is longer than the second distance B, so that it is along the central axis J2 of the wire ring portion 51a. The extension line portion 51c is less likely to be caught on the arc tube 3 if it is inserted in a direction inclined by an angle θ from the central axis J2 than if it is inserted in the direction. Specifically, if the ratio (A / B) between the first distance A and the second distance B is 1 or more, an effect starts to appear, and if A / B is 1.1 or more, workability is improved. I know from experience.

Here, the relationship between the shape of the conductor 51 and the first distance A and the second distance B will be described.
A schematic side view of the conductor 51 is shown in FIG. 7A, and the shape and tip of the conductor 51 in the virtual plane including the other end P of the wire ring portion 51a of the conductor 51 and the central axis J2 of the wire ring portion 51a. FIG. 7B schematically shows the relationship between V, the first part W, and the second part U.
In FIG. 7 (b), a line segment passing through the second part U and orthogonal to the central axis J2 of the wire ring part 51a, and a line segment passing through the first part W and parallel to the central axis J2 of the wire ring part 51a Is the origin O (0,0). Then, assuming that the diameter of the wire ring portion 51a is R, the coordinates of the first part W are W (−W, 0), the coordinates of the second part U are U (0, R), and the coordinates of the tip V are V (a, RB). The intersection of the virtual straight line L1 and the line segment OU is Q (0, x), and the intersection of the virtual straight line L1 and the line segment passing through the second part U and orthogonal to the virtual straight line L is H.

  At this time, the following equations (1) to (3) are established.

... Formula (1)

... Formula (2)

... Formula (3)

In Expression (3), α = a / B, β = W / B, and γ = R / B. Setting the ratio A / B to be 1 or more means that the opening of the ring portion viewed from the oblique direction with respect to the central axis can be made larger than that viewed from the central axis direction.
Here, the diameter R of the wire ring portion 51a is 6.8 mm, the second distance B is 4.3 mm, and the distance W between the first portion W and the origin O is 1 mm, 2 mm, 3 mm, 5 mm, and 8 mm. In this case, the A / B ((first distance) / (second distance)) value shows the third distance a dependency between the origin O and the tip V in the direction of the central axis J2 of the wire ring portion 51a. The figure is shown in FIG.

Here, the distance W between the first part W and the second part U in the direction of the central axis J2 of the wire ring part 51a is defined as “the length of the wire ring part”, and the first part W in the direction of the central axis J2 of the wire ring part 51a. The distance a between the two portions U and the tip V, that is, the distance a between the tip V of the extension line portion 51c and the virtual plane S1 is referred to as a “third distance”.
In any case where the wire ring length W is 1 mm, 2 mm, 3 mm, 5 mm, or 8 mm, if the third distance a is set to 2.5 mm or more, the value of A / B is 110% or more, that is, the first The distance A can be set to be 1.1 times or more of the second distance B. As described above, the dependency of the A / B value on the third distance a when the diameter R, the second distance B, and the distance W between the first portion W and the origin O are fixed has been described. , R, B, W, and a can be fixed and designed, and the value of A / B can be predicted in advance based on Expression (3).

Next, the process of attaching the conductor 51 to the arc tube 3 will be described.
There are two methods for attaching the conductor 51 to the arc tube 3.
In the first method, the sealing portion 11 of the arc tube 3 is inserted in the direction of the central axis J2 of the wire ring portion 51a from the side opposite to the extended line portion 51c side in the wire ring portion 51a to the inside of the wire ring portion 51a. Is the method. Here, the tip of the extension line portion 51c includes one end continuous to the extension line portion 51c of the wire ring portion 51a and the side of the wire ring portion 51a with respect to a virtual plane S1 orthogonal to the central axis of the wire ring portion 51a. It inclines so that it may be located on the opposite side. Thereby, when the sealing part 11 of the arc tube 3 is inserted inside the wire ring part 51a of the conductor 51, the extension line part from the state in which the end face in the extending direction of the sealing part 11 is in contact with the side surface of the extension line part 51c. When a force is applied to 51c in the direction of the central axis J2 of the wire ring portion 51a, a part of the force escapes in a direction away from the central axis of the wire ring portion 51a, and the tip of the extension line portion 51c Since the distance between the tip and the inside of the wire ring portion 51a facing each other across the central axis J2 of the wire ring portion 51a is widened, the tip of the extension wire portion 51c is the end surface in the extending direction of the sealing portion 11 correspondingly. It becomes difficult to get caught in.

Therefore, the conductor 51 can be easily attached to the arc tube 3.
In the second method, the sealing portion 11 of the arc tube 3 is crossed with the direction of the central axis J2 of the wire ring portion 51a from the side opposite to the extended line portion 51c side of the wire ring portion 51a to the inside of the wire ring portion 51a. It is a method of inserting in the direction to do. Hereinafter, the second method will be described in detail.
FIGS. 9A to 9D are views for explaining the process of attaching the conductor 51 to the arc tube 3, and FIG. 10A is a view taken along the line XX in FIG. 9B. Fig. 10 (b) shows an arrow view taken along the line XX in Fig. 9 (b).

First, as shown in FIG. 9A, the arc tube 51a is connected to the arc tube 51a in a state where the central axis J2 of the wire ring 51a of the conductor 51 is inclined by the angle θ with respect to the central axis J1 of the arc tube 3. 3 side of the sealing part 11 is inserted.
Next, as shown in FIG. 9 (b), the wire ring portion 51 a is placed in the arc tube until the wire ring portion 51 a is positioned in the vicinity of the boundary portion between the sealing portion 11 of the arc tube 3 and the light emitting portion 6. 3 is moved along the central axis J1. At this time, as shown in FIG. 10A, since the length of the first distance A is longer than the diameter of the sealing portion 11 of the arc tube 3, the tip of the extension line portion 51c is the sealing portion 11. There is no contact with the outer surface. Thereby, the sealing part 11 of the arc tube 3 can be smoothly inserted into the wire ring part 51 a of the conductor 51.

  Thereafter, as shown in FIG. 9C, the main portion 51 e constituting a part of the extending portion 51 b is brought close to the outer surface of the sealing portion 13. Then, as shown in FIG. 10B, the distal end of the extension line portion 51 c comes into contact with the outer surface of the sealing portion 11. Here, from the state where the extension line portion 51 c does not contact the outer surface of the sealing portion 11, the extension portion 51 b is brought closer to the outer surface of the sealing portion 11, and the tip of the extension line portion 51 c is brought to the outer surface of the sealing portion 11. In the state of contact for the first time, the extending part 51b is in a state of being separated from the outer surface of the sealing part 11 (see the broken line in FIG. 9C). At this time, the extending direction of the extending portion 51b is inclined with respect to the central axis J1 of the arc tube 3 by an angle φ. From this state, when the extended portion 51b is brought closer to the outer surface of the sealing portion 11 and along the outer surface of the sealing portion 11 (see the arrow in FIG. 9C), the tip of the extended line portion 51c is the sealing portion. 11 is pressed against the outer surface. Thereby, the front-end | tip of the extension line part 51c can be made to contact the outer surface of the sealing part 11 reliably.

Finally, as shown in FIG. 9 (d), the tip of the main portion 51 e is wound around the external lead wire 29. Thereby, the conductor 51 and the electrode 9 are electrically connected through the external lead wire 29 and the metal foil 25.
<3> Summary After all, in the lamp 1 according to the present embodiment, the tip of the extension line portion 51c includes one end continuous to the extension line portion 51c in the wire ring portion 51a and is orthogonal to the central axis of the wire ring portion 51a. It inclines so that it may be located in the opposite side to the wire ring part 51a side with respect to virtual plane S1. Thus, when the sealing portion 11 of the arc tube 3 is inserted into the inside of the wire ring portion 51a from the other end side of the wire ring portion 51a of the conductor 51, the end surface in the extending direction of the sealing portion 11 is set to the extension line portion 51c. When a force is applied in the direction of the central axis J2 of the wire ring portion 51a to the extension line portion 51c from the state in contact with the side surface, a part of the force moves the extension line portion 51c away from the central axis J2 of the wire ring portion 51a. Act on. As described above, the force acting in the direction away from the central axis J2 of the wire ring portion 51a is generated, thereby sandwiching the tip of the extension line portion 51c and the tip and the central axis J2 of the wire ring portion 51a. Since the distance between the opposing wire ring portions 51a increases, the tip of the extended wire portion 51c is less likely to be caught on the end surface of the sealing portion 11 in the extending direction. Accordingly, since the operator who performs the assembly work of the lamp 1 can easily perform the work of inserting the arc tube 3 into the wire ring portion 51a, the assembly can be facilitated accordingly.

In addition, the conductor 51 according to the present embodiment includes the tip V and the second portion W of the extension line portion 51c in a virtual plane including the central axis J2 of the wire ring portion 51a and the other end P of the wire ring portion 51a. The first distance A, which is the shortest distance between the imaginary straight line L1 and the first part U, is the second distance B between the tip V and the first part U in the direction orthogonal to the central axis J2. It is longer than that.
Therefore, when the sealing portion 11 of the arc tube 3 is inserted inside the wire ring portion 51a, if the seal portion 11 of the arc tube 3 is inserted in a direction inclined by an angle θ from the central axis J2 of the wire ring portion 51a. The extension line portion 51c is more difficult to be caught. Therefore, it is possible to further facilitate the operation of inserting the arc tube 3 into the wire ring portion 51a for the operator who performs the assembly operation of the lamp 1.

<Embodiment 2>
11 and 12 are perspective views of projectors 101 and 201 according to the present embodiment.
The projector 101 is a so-called front projector, and has a function of projecting an image toward a screen (not shown) installed in front of the projector.

The projector 101 includes a rectangular box-shaped housing 102, a lamp unit 46 housed in the housing 102, an optical unit 103, a control unit 104, a projection lens 105, a cooling fan unit 106, and a power supply unit 107. With. In addition, in FIG. 11, the state which removed the top plate of the housing | casing 102 is shown.
The optical unit 103 further includes an image forming unit that forms an image by polarizing incident light, a light combining unit that combines light emitted from the image forming unit, and an illumination that makes light emitted from the lamp unit 46 incident on the image forming unit. Has a unit.

  The illumination unit has three color filters or the like (not shown), separates the light emitted from the lamp unit 46 into three primary colors, and enters the image forming unit. Then, the light combining unit combines the light emitted from the image forming unit after being separated into three primary colors, thereby generating a full-color image. The control unit 104 controls an image forming unit and a light combining unit that constitute a part of the optical unit 103.

The projection lens 105 enlarges and projects the image generated by the optical unit 103.
The power supply unit 107 converts electric power supplied from a commercial power supply into electric power suitable for the control unit 104 and the lamp unit 46 and supplies the electric power to the control unit 104 and the lamp unit 46, respectively.
12, the projector 201 is a so-called rear projector, and a lamp unit 46, an optical unit, a projection lens, a mirror, a lighting device (all not shown) and the like are housed in a housing 202. Yes.

An image projected from the projection lens and reflected by the mirror is projected from the back side of the transmissive screen 203.
<Modification>
(1) In the first embodiment, the extending direction of the extension line portion 51c coincides with the virtual straight line L2 connecting the end portion of the wire ring portion 51a continuous with the extension line portion 451c and the central axis J1 of the arc tube 3. However, the present invention is not limited to this. For example, the extending direction of the extension line portion may be inclined with respect to the virtual straight line L2.

FIG. 13 is a sectional view of a part of the lamp according to this modification.
When viewed from the direction along the central axis J2 of the wire ring portion 51a, the extending direction of the extended line portion 51c is a virtual plane (parallel virtual plane) including the other end of the wire ring portion 51a and the central axis J2 of the wire ring portion 51a. ) Inclined by an angle δ with respect to S5.
According to this configuration, when the tip of the extension line portion 451c is pressed against the outer surface of the arc tube 3, a part of the force applied to the outer surface of the arc tube 3 from the tip of the extension line portion 451c is around the central axis J1 of the arc tube 3. It is possible to escape in the direction of turning around. Therefore, since the stress applied to the arc tube 3 from the tip of the extension line portion 451c can be relieved, the arc tube 3 can be prevented from being damaged.

  (2) In the first embodiment, in a virtual plane including the central axis J2 of the wire ring portion 51a and the other end P of the wire ring portion 51a, one end of the wire ring portion 51a continuous to the extended line portion 51c; Although the example in which the other end P continuous to the extending part 51b is located on the opposite side with respect to the central axis J2 has been described, the present invention is not limited to this, and the one end and the other of the wire ring part 51a are not limited thereto. The end may be located on the same side with respect to the central axis J2.

1 High-pressure discharge lamp (lamp)
DESCRIPTION OF SYMBOLS 3 Light emission tube 5 Discharge space 6 Light emission part 7,9 Electrode 11,13 Sealing part 23,25 Metal foil 27,29 External lead wire 46 Lamp unit 51 Conductor 51a Wire ring part 51b Extension part 51c, 451c Extension line part 51d Bent part 51e Main part 101,201 Projector

As shown in FIG. 4A, in the lamp 1001 according to the comparative example, the extending direction of the extension line portion 1051c of the conductor 1051 is orthogonal to the central axis J1 of the arc tube 3. In other words, the extended line portion 1051c includes the other end of the wire ring portion 51a and extends in a virtual plane S1 orthogonal to the central axis J2 of the wire ring portion 51a. The extension line portion 1051c has an elongated columnar shape, and a surface orthogonal to the central axis of the extension line portion 1051c is formed at the tip. As shown in FIG. 4B, the extension line portion 1051c is formed. The surface formed at the tip of the sealing member 11 is substantially in surface contact with the outer surface of the sealing portion 11.
On the other hand, as shown in FIG. 3A, in the lamp 1 according to the present embodiment, the extending direction of the extension line portion 51 c of the conductor 51 is inclined with respect to the central axis of the sealing portion 11. Therefore, as shown in FIG. 3C, substantially one point on the periphery of the tip of the extension line portion 51 c is in contact with the outer surface of the sealing portion 11. That is, in the lamp 1, the contact area between the tip of the extension line portion 51c and the outer surface of the sealing portion 11 is the contact area between the tip of the extension line portion 1051c and the outer surface of the sealing portion 11 in the lamp 1001 according to the comparative example. It is extremely small compared to

Here, the relationship between the shape of the conductor 51 and the first distance A and the second distance B will be described.
A schematic side view of the conductor 51 is shown in FIG. 7A, and the shape and tip of the conductor 51 in the virtual plane including the other end P of the wire ring portion 51a of the conductor 51 and the central axis J2 of the wire ring portion 51a. FIG. 7B schematically shows the relationship between V, the first part U, and the second part W.
In FIG. 7B, a line segment passing through the first part U and orthogonal to the central axis J2 of the wire ring part 51a, and a line segment passing through the second part W and parallel to the central axis J2 of the wire ring part 51a Is the origin O (0,0). Then, assuming that the diameter of the wire ring portion 51a is R, the coordinates of the second part W are W (−W, 0), the coordinates of the first part U are U (0, R), and the coordinates of the tip V are V (a, R−r) . In addition, the intersection of the virtual straight line L1 and the line segment OU is Q (0, x), and the intersection of the virtual straight line L1 and the line segment passing through the first portion U and orthogonal to the virtual straight line L1 is H. Here, r is equal to B.

In Expression (3), α = a / B, β = W / B, and γ = R / B. Setting the ratio A / B to be 1 or more means that the opening of the ring portion viewed from the oblique direction with respect to the central axis can be made larger than that viewed from the central axis direction.
Here, the diameter R of the wire ring portion 51a is 6.8 mm, the second distance B is 4.3 mm, and the distance W between the second portion W and the origin O is 1 mm, 2 mm, 3 mm, 5 mm, and 8 mm. In this case, the A / B ((first distance) / (second distance)) value shows the third distance a dependency between the origin O and the tip V in the direction of the central axis J2 of the wire ring portion 51a. The figure is shown in FIG.

Here, in the central axis J2 direction Senwa portion 51a, the distance W between the first portion U and a second portion W as "Senwa unit length", in the central axis J2 direction Senwa portion 51a, the The distance a between the one portion U and the tip V is referred to as a “third distance”.
In any case where the wire ring length W is 1 mm, 2 mm, 3 mm, 5 mm, or 8 mm, if the third distance a is set to 2.5 mm or more, the value of A / B is 110% or more, that is, the first The distance A can be set to be 1.1 times or more of the second distance B. As described above, the dependency of the A / B value on the third distance a when the diameter R, the second distance B, and the distance W between the second portion W and the origin O are fixed has been described. , R, B, W, and a can be fixed and designed, and the value of A / B can be predicted in advance based on Expression (3).

Claims (7)

A light emitting tube having a light emitting portion in which a discharge space is formed and a pair of sealing portions extending in a direction away from the light emitting portion, and an electrode and an end of the electrode opposite to one end located in the discharge space A pair of electrode structures having a metal foil connected to the other end of the pair and disposed in a state where at least the metal foil is sealed inside each of the pair of sealing portions, and an outer periphery of one sealing portion A spiral wire ring wound around and an extension connected from the one end of the wire ring portion and connected to the electrode structure sealed around the other sealing portion, bypassing the outer periphery of the light emitting portion A high-pressure discharge lamp comprising a starting voltage reducing conductor having a portion,
On the other end of the wire ring portion of the conductor, extending toward the center axis of the wire ring portion and inclined in a direction away from the wire ring portion with respect to an orthogonal virtual plane orthogonal to the center axis of the wire ring portion A high-pressure discharge lamp, characterized in that a wire portion is provided continuously, and a tip of the extended wire portion is in contact with or close to a surface of a portion of the one sealing portion where the metal foil is sealed inside. A tip of the extension line portion is located in the parallel virtual plane,
In the cross section obtained by cutting the other end in the wire ring portion, a parallel virtual plane parallel to the central axis including the center axis of the wire ring portion and the other end of the wire ring portion, the wire ring portion A first part closest to the tip among a plurality of parts arranged on the opposite side to the side where the other end is located across the central axis;
In the cross section obtained by cutting at the tip of the extension line portion and the parallel virtual plane, the line in a plurality of portions arranged on the same side as the side where the tip is located across the central axis in the wire ring portion A first distance that is the shortest distance between a virtual straight line connecting the second part closest to one end of the ring part is A, and a direction perpendicular to the central axis between the tip and the second part Let B be the second distance at
The distance in the direction along the central axis between the second part and the tip is a,
The distance in the direction along the central axis between the first part and the second part is W,
When the inner diameter of the wire ring portion is R, a / B is α, β = W / B, γ = R / B
The following relational expression (A) holds
... Formula (A)


The high-pressure discharge lamp according to claim 1. The following relational expression (B) holds
... Formula (B)
The high-pressure discharge lamp according to claim 2. The high-pressure discharge lamp according to any one of claims 1 to 3, wherein a part of the extending portion is disposed along an outer surface of the sealing portion. 5. The high pressure according to claim 1, wherein the extension line portion has a cylindrical shape, and a surface perpendicular to the central axis of the extension line portion is formed at a tip. Discharge lamp. The extension line portion is inclined with respect to the parallel imaginary plane when viewed from a direction along the central axis of the wire ring portion. High pressure discharge lamp. A projector comprising the high-pressure discharge lamp according to any one of claims 1 to 6.