JP2001155879A - High-pressure discharge lamp, high-pressure discharge lamp lighting apparatus and lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp, a high-pressure discharge lamp lighting apparatus using the same and lighting apparatus of which metal base can easily contain a starter using nonlinear capacitor. SOLUTION: A base B is mounted on one end of an outer tube OB, which includes a sealing portion at one end and a discharge tube 4 protruded from the sealing portion, to contain the discharge tube. A starter ST has pulse generating means PG, which comprises heat resistant wiring board 10, nonlinear capacitor Cnl, and pulse stopping means PS, which comprises heat response switch ST operating responding to heat generated from the light-emitting tube IB. The starter ST is disposed in the base B so that the wiring board 10 is perpendicular to axis of the outer tube OB and the heat response switch ST is toward the light emitting tube IB from the wiring board 10. Since the starter ST is disposed in the base B to use a space formed around discharge tube 4, although a space within the base B is small, the function can be performed and a response of the heat response switch ST can efficiently respond to the heat generated from the light emitting tube IB. Also, the starter can be easily mounted to the base making assembly easy.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high pressure discharge lamp provided with a starter for generating a pulse voltage at the time of starting, a high pressure discharge lamp lighting device using the same, and a lighting device.

[0002]

2. Description of the Related Art In order to start a high-pressure discharge lamp such as a high-pressure sodium lamp using a small ballast having a secondary open-circuit voltage as low as possible, a pulse voltage is generated and applied to an arc tube for ionization. It is effective to break the insulation of the medium. For this reason, a high pressure discharge lamp having a built-in starter has been conventionally used.

A conventional starter of this type is provided with a self-heating type thermally responsive switch and a current limiting resistor and housed in an outer tube, or further provided with a pulse transformer and housed in a base. (JP-A-59-21799)
No. 3) is known.

[0004] However, a common problem with these conventional starters is that the pulse generation operation continues even if the high pressure discharge lamp becomes defective. Therefore, there is a problem that noise is generated in the power supply line. In addition, in severe cases, the insulation of the ballast and wiring is broken, which may cause inconvenience such as burnout.

On the other hand, a configuration in which a starter in which a non-linear capacitor and a diac are combined is housed in an outer tube is described in, for example, Japanese Patent Application Laid-Open No. 2-16553. The nonlinear capacitor used here is 10
It is a ferroelectric substance having a Curie point at about 0 ° C. Therefore, if pulse generation operation continues when the arc tube is not at a point, the temperature rises by self-heating or external auxiliary heating, reaches the Curie point, and the ferroelectricity is increased. The loss can stop the pulse generation within a certain time.

When a nonlinear capacitor is accommodated in an outer tube whose inside is evacuated to a vacuum, when the arc tube leaks, the non-linear capacitor self-discharges due to the rare gas leaking from the arc tube and self-destructs. Can be stopped.

For the above reasons, a conventional starter using a non-linear capacitor has been used exclusively housed in an outer tube. However, the above publication suggests that a starter using a non-linear capacitor can be housed in a base, but does not disclose any description of a specific configuration as to how to house the starter. Also, it is not shown in the drawings.

[0008]

However, when a conventional starter using a non-linear capacitor is housed in an outer tube,
Since the heat-resistant temperature of the starter's diac is low, it is stored separately in the base. For this reason, in addition to a pair of lead wires connected to the arc tube and the starter, a third lead wire is required for connection to Sidac.

Therefore, a total of three lead wires are required to pass through the sealing portion of the outer tube.

[0010] Further, since the starter has five or six components, the arc tube and the starter are assembled three-dimensionally in a flare stem in a required positional relationship before the flare stem is connected to the end of the outer tube. Since the outer tube must be sealed and assembled, the process becomes complicated. For this reason, there is a problem that the productivity is poor and the cost is increased.

On the other hand, when a starter using a non-linear capacitor is to be housed in a base, a mounting problem is first encountered. That is, since the space formed in the base is surprisingly small, it is quite difficult to easily store the starter in the base while maintaining the necessary insulating relationship between the components of the starter and the base. It turned out to be.

When the starter is housed in the outer tube, it is difficult to stop the pulse generation operation reliably and reliably after the light-emitting tube is turned on. Also, it is difficult to store the starter in the base. Factor.

An object of the present invention is to provide a high-pressure discharge lamp provided with a starter using a non-linear capacitor easily configured to be housed in a base, a high-pressure discharge lamp lighting device and a lighting device using the same.

[0014]

A high-pressure discharge lamp according to the present invention has a light-emitting tube in which a pair of electrodes are sealed at both ends of a translucent discharge vessel and an ionization medium is sealed inside; An outer tube having a stop portion and a tip-off portion formed at the tip and having an exhaust pipe protruding from the sealing portion and accommodating the luminous tube therein; attached to one end of the outer tube so as to include the exhaust pipe; A hollow base connected to the electrode of the arc tube and including a heat-resistant wiring board, a pulse generating means including a non-linear capacitor, and a thermoresponsive switch for stopping the pulse generating operation in response to the heat generated by the arc tube. A starter disposed in the base with a pulse stop means, wherein the surface of the wiring board is substantially orthogonal to the axis of the outer tube, and the thermoresponsive switch is positioned on the side of the arc tube from the wiring board; Starter, and It is characterized in that there.

In the present invention and each of the following inventions, definitions and technical meanings of terms are as follows unless otherwise specified.

The high-pressure discharge lamp can be applied to all high-pressure discharge lamps such as a high-pressure sodium lamp and a metal halide lamp. Therefore, it is assumed that the material of the arc tube and the ionizing medium to be enclosed can be appropriately selected according to the type of the high-pressure discharge lamp.

Also, in order to facilitate starting the arc tube,
A starting auxiliary conductor having the same potential as one of the electrodes can be extended to the vicinity of the other electrode while approaching the arc tube.

The high-pressure discharge lamp will be described below for each component.

<Regarding the arc tube> The arc tube is provided with a translucent discharge vessel, a pair of electrodes and an ionizing medium.

(About Translucent Discharge Vessel) The translucent discharge vessel is made of quartz glass, translucent ceramics or the like.
It is formed of a fireproof and airtight material, surrounds the discharge space, and hermetically seals the electrodes.

(Regarding Electrodes) A pair of electrodes are made of tungsten, doped tungsten, or the like, and are sealed inside the light-transmitting discharge vessel so as to be spaced apart from each other. When the translucent discharge vessel is elongated, it is sealed at both ends. When the translucent discharge vessel is spherical or elliptical spherical, not only is a pair of electrodes sealed at both ends of the translucent discharge vessel, but also, if necessary, almost parallel from one end side. To form a one-sided sealing structure in which the package is separated and sealed.

In the case of a high-pressure sodium lamp, since a characteristic ceramic is used as the light-transmitting discharge vessel, the electrode is formed at the inner end of a tube of a sealing metal such as niobium that penetrates the light-transmitting discharge vessel in an airtight manner. Can be supported.

Further, in the case of a metal halide lamp, quartz glass or translucent ceramics is used as the translucent discharge vessel. In the case of quartz glass, the electrode is pinched at the base end because it is sealed by a pinch seal. It can be welded to molybdenum foil embedded in the seal portion, and the periphery of the intermediate portion can be supported by quartz glass. In the case of translucent ceramics, it is basically similar to that of the high-pressure sodium lamp.

(Regarding Ionization Medium) The ionization medium is sealed in the translucent discharge vessel. The ionizing medium differs depending on the type of the high-pressure discharge lamp.

That is, in the case of a high-pressure sodium lamp,
The luminescent metal is sodium Na, the rare gas for starting and buffer medium is xenon Xe or neon Ne, and mercury Hg is often encapsulated in the form of sodium amalgam as a buffer medium.

In the case of a metal halide lamp, it is a halide of a luminescent metal and a rare gas such as argon Ar or xenon Xe. Luminescent metals are sodium Na, thallium Tl, indium In, lithium Li, scandium S
One or more of c and rare earths are appropriately selected and used so as to obtain desired color rendering properties, luminous efficiency and color temperature.
As the halogen, iodine, bromine, chlorine and the like can be used.

<Regarding Outer Tube> The outer tube houses the arc tube.

Further, the inside of the outer tube is evacuated to allow a vacuum or a gas mainly containing an inert gas such as nitrogen N2 or argon Ar.

Further, in order to exhaust the inside of the outer tube and further fill an inert gas as required, the outer tube has a sealing portion at one end thereof and an exhaust pipe protruding from the sealing portion.
A tip-off portion is formed at the tip of the exhaust pipe. The sealing portion of the outer tube is most commonly formed by a flare stem, but in the present invention, a bead stem, a pinch seal stem, or the like may be used.

Furthermore, the shape of the outer tube is free,
For example, T type, ED type, BT type and the like can be adopted.

Further, the material of the outer tube is free,
For example, hard glass can be used.

<Regarding the base> The base is a means for supplying power to the arc tube and the starter in cooperation with the lamp socket.

In some cases, the base is used to support a high-pressure discharge lamp.

Further, the base is E-shaped as a screw-in type,
There are various types such as a G type as a plug type and a BY type as a rotary type, but the present invention is not limited to a specific type.
However, in a single-base high-pressure discharge lamp, an E-base is most widely used. In the case of E-type base,
The shell having a thread groove formed on the outer periphery and a center contact insulated at the end of the shell via eyelet glass constitute a pair of terminals.

In the present invention, the base is mounted so as to enclose the exhaust pipe at one end of the outer pipe. Therefore, a space is formed in the base around the exhaust pipe protruding from the outer pipe.

The base is connected to the electrode of the arc tube.

<Regarding the Starter> The starter is a wiring board,
Pulse generating means including a non-linear capacitor and pulse stopping means including a thermally responsive switch,
It is arranged in the base.

The starter generates a pulse voltage required for starting the high-pressure discharge lamp at the time of starting the high-pressure discharge lamp and applies the pulse voltage to the arc tube to accelerate the start of the high-pressure discharge lamp. Preferably, safety means are provided in addition to the pulse stopping means for stopping the operation.

Further, the starting pulse voltage generated by the pulse generating means of the starter is applied between a pair of electrodes of the arc tube.
Alternatively, if a starting auxiliary conductor is provided, it is applied between one electrode and the starting auxiliary conductor extending close to this electrode to facilitate starting the arc tube.

(Regarding the Wiring Board) The wiring board is made of a heat-resistant material such as ceramics or heat-resistant synthetic resin, and has a non-linear capacitor mounted on one substrate surface.

The wiring board is provided with wiring connection means for connecting the base and the arc tube to required portions of the mounted circuit components. As the wiring connection means,
Appropriate connection means such as a lapping connection structure, a caulking connection structure, or a solder connection structure can be employed.

Further, in order to connect the wiring board to the shell of the base, connection terminals are provided on part or all of the periphery of the wiring board, and when the wiring board is pushed into the base, the connection terminals are connected to the shell. It can be configured to be connected by being pressed against the inner surface of the.

(Pulse Generating Means) The pulse generating means is constituted by using a non-linear capacitor as a switch element.

The non-linear capacitor is barium titanate B
When a material exhibiting ferroelectric properties in a normal temperature phase such as iTiO _{3 is formed} as a dielectric and a voltage lower than the turnover voltage is applied, the capacitor exhibits capacitance as a capacitor. When it reaches, it is a kind of contactless switch that saturates rapidly. For this reason, when the power supply is turned on and the instantaneous value is lower than the turnover voltage in a half cycle of the AC voltage, the non-linear capacitor is turned on because it acts as a capacitor, and the ballast has a charging current. Although it is flowing, it is rapidly saturated at the moment when the instantaneous value of the applied voltage exceeds the turnover voltage of the nonlinear capacitor, so that the charging current flowing in the ballast changes abruptly, and due to the back electromotive force at that time A pulse voltage is generated in the ballast.

In order to adjust the phase of the voltage at which the nonlinear capacitor turns over for a half cycle of the AC voltage, a parallel circuit of a resistor and a trigger element such as a diac is connected in series with the nonlinear capacitor. Circuits can be combined as appropriate.

(Regarding the arrangement of the starter in the base) The wiring board of the starter is disposed in the base such that the substrate surface is substantially perpendicular to the axis of the outer tube. Then, if necessary, the wiring board is abutted or straddled with an insulator such as eyelet glass, so that the wiring board can be insulated and fixed in the base with respect to the shell and the center contact. However, an insulating seat can be formed separately from the eyelet glass to support the wiring board in an insulating manner.

Further, by forming an insertion hole through which the exhaust pipe penetrates in the center of the wiring board and fitting the through hole into the exhaust pipe, the wiring board can be fixed. Further, if necessary, the wiring board can be supported by the exhaust pipe by fixing the wiring board to the exhaust pipe with an adhesive or the like. In any of the above embodiments, a space for mounting circuit components can be ensured on the side of the wiring board opposite to the arc tube, which is advantageous particularly when temperature rise is to be avoided as much as possible.

Furthermore, semiconductor components such as non-linear capacitors generally have weaker temperature characteristics than other circuit components, and therefore, care must be taken so that the temperature does not exceed the allowable temperature for mounting. In contrast, in the present invention,
By moving the starter from the position inside the arc tube to the inside of the base, the temperature rise of the starter can be kept relatively low, so that semiconductor components such as non-linear capacitors and diacs are placed on the arc tube side with respect to the wiring board. And on either side of it.

Accordingly, since the base includes a portion that protrudes from the end of the outer pipe of the exhaust pipe, a space is formed around the exhaust pipe. The circuit components of the starter can be stored in the base by utilizing the above.

(Pulse Stop Means) The pulse stop means is a means for stopping the pulse generation operation when the pulse voltage becomes unnecessary, and the starter is provided with a pulse stop means for appropriately performing this operation.

By the way, the time when the pulse voltage becomes unnecessary is when the arc tube is started and turned on. For this purpose, for example, a thermally responsive switch such as a bimetal switch can be used by being connected in series with the pulse generating means.

The heat responsive switch is disposed so as to be sensitive to the temperature of the arc tube. When the arc tube is turned on, the temperature rises, and the heat responsive switch is turned off.

(Regarding the safety means) The safety means is a means for preventing the starter from continuously generating a starting pulse when the arc tube is turned off. The starter is provided with a safety function as appropriate. Is done.

As a safety means, the non-linear capacitor can be heated to the Curie temperature by, for example, the self-heating action of the non-linear capacitor or by a heating element having the non-linear capacitor disposed in the vicinity. In this case, when the non-linear capacitor reaches the Curie temperature, the switching action stops, and the generation of the start pulse is stopped. In addition, it can be constituted by a resistor formed by attaching a heating element to a wiring board.

Further, when a secondary open-circuit voltage of the ballast is continuously applied to the starter, a thermally responsive switch which opens in response to the voltage is provided, and this switch is connected in series with the non-linear capacitor. It can also be configured.

Further, the heat responsive switch of the pulse stopping means is configured to not only respond to the heat generated by the arc tube but also to provide a heating heater by a voltage between both ends of the arc tube and to respond to the heat. This can also serve as a safety means.

<Operation of the present invention> In the present invention, since the wiring board surface of the starter is disposed in the base so as to be substantially perpendicular to the axis of the outer tube, the starter can be inserted into the base. At the time of assembling, the wiring board is inserted into the base, and the base is mechanically screwed into the end of the outer tube while making necessary connections with the arc tube and the base, or is mounted using an inorganic adhesive or the like. Further, if an insertion hole through which the exhaust pipe penetrates is formed at the center of the wiring board, the wiring board can be positioned by inserting the wiring board into the exhaust pipe, and further, the wiring board can be supported by the exhaust pipe. .

Also, since high circuit components such as a non-linear capacitor are arranged in the space formed around the exhaust pipe, the space in the base can be effectively used to increase the mounting density. . For this reason, even if the inside of the base supplies a narrow space, the starter can be housed in the base so as to exhibit the intended function.

Further, when the starter is incorporated into the base, the circuit board can be dropped by holding the circuit components, and the starter can be inserted into the base.

By the way, at the time of starting, the secondary open voltage of the ballast is applied to the arc tube and the starting device when the power is turned on, as in the case of the high-pressure discharge lamp in which the starting device is housed in the outer tube. The non-linear capacitor of the means acts as a kind of switch element to generate a pulse voltage from the ballast, which is applied to the arc tube, thereby facilitating the starting of the arc tube of the high-pressure discharge lamp. When the arc tube is started and turned on, the heat responsive switch of the pulse stopping means of the starter receives the generated heat of the arc tube and responds to stop the generation of the pulse voltage.

In the case where the safety means is provided in the starter, if the arc tube becomes inconsistent, it operates to cut off the generation of a continuous pulse voltage, thereby preventing noise from being generated, and To prevent dielectric breakdown.

According to a second aspect of the present invention, in the high pressure discharge lamp according to the first aspect, the starter includes a semiconductor component such as a non-linear capacitor mounted on a side of the wiring board opposite to the arc tube. Features.

It is preferable that the wiring board not only has heat resistance but also uses a material having as small a thermal conductivity as possible. However, even if the thermal conductivity is relatively large such as, for example, alumina ceramics, a certain heat shielding effect can be recognized due to the interposition of the wiring board between the semiconductor component and the arc tube.

Therefore, when semiconductor components such as diacs are used as circuit components of the starter, including the non-linear capacitor, if these semiconductor components exceed or are likely to exceed the allowable temperature during operation of the high-pressure discharge lamp. With the configuration as defined in the present invention, it is possible to reliably maintain the temperature within the allowable temperature by the heat shielding effect of the wiring board.

A high-pressure discharge lamp according to a third aspect of the present invention is a high-intensity discharge lamp in which a pair of electrodes are sealed at both ends of a translucent discharge vessel and an ionization medium containing at least Na and xenon is sealed therein; A tip-off portion is formed at the stop portion and at the tip and an exhaust pipe protruding from the sealing portion is provided,
An outer tube accommodating the arc tube therein; a hollow base attached to one end of the outer tube so as to enclose the exhaust tube and connected to an electrode of the arc tube; one of the arc tubes in the outer tube; An easy-fusing conductor inserted in series between the electrode and the base, and a fusing electrode connected to the other electrode of the arc tube and the base while being spaced apart from the easy-fusing conductor,
A self-fusing device for causing a discharge between the fusing conductor and the fusing electrode when the arc tube leaks, thereby fusing the fusing conductor; a pulse generating means including a wiring board, a non-linear capacitor, and heat generated by the arc tube And a starter disposed in the base with the heat-responsive switch of the pulse-stopping means positioned closer to the arc tube than the wiring board. And

The present invention defines an arrangement having a safety means suitable for a high-pressure sodium lamp. That is,
In the present invention, the self-fusing device constitutes a safety means when the arc tube leaks.

In the case of a high-pressure sodium lamp, the inside of the outer tube is evacuated to keep the arc tube warm.

Therefore, when a leak occurs in the arc tube of the high-pressure sodium lamp, the rare gas leaks from the arc tube, and the inside of the outer tube becomes a low-pressure rare gas atmosphere. In such a state, a rare gas discharge is generated between the fusing electrode constituting the self-fusing device provided in the outer tube and the easily fusing conductor.
When a rare gas discharge occurs, a large discharge current flows from the power supply into the self-cutting device, so that the easily cut-off conductor is easily cut off.

When the easily fusible conductor blows, the power supply to the arc tube is cut off, so that the discharge in the arc tube stops. Thereby, safety of the high-pressure discharge lamp is achieved.

The easily fusing conductor may have any structure as long as it is easily blown when a low-pressure rare gas discharge occurs. For example,
A foil-like conductor, a plate-like body or a linear body made of a readily soluble metal can be used as the easily-fusible conductor.

The fusing electrode does not work when the arc tube is in a normal state because the outer tube is in a vacuum state. However, when the arc tube leaks and the inside of the outer tube becomes a rare gas atmosphere, the electrode is cut off. Act as For this reason, the fusing electrode is
Connected to the electrode on the opposite side of the electrode to which the fusing conductor is connected, and placed at a position close to the fusing conductor so that discharge easily starts between the fusing conductor and the leak Have been.

The fusing electrode is desirably formed of tungsten or the like coated with an electron emitting material.

According to a fourth aspect of the present invention, there is provided a lighting device for a high-pressure discharge lamp according to any one of the first to third aspects; To generate a pulse voltage,
And a ballast acting as a current limiting means for the high pressure discharge lamp.

The present invention comprises a high-pressure discharge lamp and a ballast which cooperates with the high-pressure discharge lamp to generate a pulse voltage at the time of starting and exhibits a function of stabilizing the lamp current during operation of the high-pressure discharge lamp.

Since the high-pressure discharge lamp has the structure of claims 1 to 3, since the starter is housed in the base, the outer tube can be easily assembled, and the starter can be incorporated in the base. Easy.

According to a fifth aspect of the present invention, there is provided a lighting device comprising: a lighting device main body; and the high-pressure discharge lamp according to any one of the first to third aspects mounted on the lighting device main body. I have.

[0077] "Illumination device" refers to a broad concept that includes any device configured to use the light emission of a high pressure discharge lamp for any purpose. Therefore, it is widely applicable to various uses such as lighting, light projection and photochemical reaction.

For lighting, it is applicable to various indoor and outdoor lighting fixtures.

For light projection, the present invention is applicable to light projection to a liquid crystal projector, an overhead projector, or a display such as an advertisement / advertisement or a sign.

For photochemical reaction, it is suitable for processing of a photocurable resin and a photodrying ink, synthesis of a synthetic resin, and the like.

[0081]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a first embodiment of the high-pressure discharge lamp of the present invention.

FIG. 2 is an enlarged cross-sectional view of an essential part.

FIG. 3 is an enlarged plan view of the starter.

FIG. 4 is an enlarged bottom view of the starter.

This embodiment is a metal halide lamp.

In the figure, IB is an arc tube, OB is an outer tube,
B is a base and ST is a starter.

<Regarding the arc tube IB> The arc tube IB is provided with a translucent discharge vessel 1, a pair of upper and lower electrodes 2, 2 and an ionizing medium not shown in the drawing.

The translucent discharge vessel 1 is made of quartz glass, and has pinch seal portions 1a and 1b at both ends.

The electrode 2 has a vertically symmetric structure, and includes a tungsten shaft portion 2a and a coil portion 2b mounted near the distal end portion of the shaft portion 2a.
b is welded to a molybdenum foil (not shown) buried hermetically.

The ionizing medium comprises a luminescent metal halide, a rare gas and mercury.

<Regarding Outer Tube OB> The outer tube OB is made of hard glass, and has a sealing portion 3 and an exhaust tube 4 at the lower end as shown in FIG. ing.

The sealing portion 3 is formed using a flare stem 3a. That is, the sealing portion 3 is formed by sealing the flare portion 3a2 of the flare stem 3a to the end of the outer tube OB. A screw groove 3b is formed around the sealing portion 3 by glass molding.

The flare stem 3a has a pinch seal portion 3a.
1, flare portion 3a2, a pair of internal introduction conductors 3a3, 3a
4 and a pair of external introduction conductors 3a5, 3a6.

The pair of internal introduction conductors 3a3, 3a4 and the pair of external introduction conductors 3a5, 3a6 are connected to each other via a sealing metal in the pinch seal portion 3a1, and penetrate inside and outside the flare stem 3a. It constitutes a conductor and is hermetically sealed to the flare stem 3a.

The exhaust pipe 4 has a base end welded to the flare stem 3a and opens into the outer pipe OB near the boundary between the pinch seal portion 3a1 and the flare portion 3a2. A tip-off portion 4a is formed at the tip of.

The inside of the outer pipe OB is exhausted through the exhaust pipe 4 and is filled with nitrogen.

Further, an arc tube IB is housed inside the outer tube OB. A lower support frame 5 and an upper support frame 6 are provided to fix the arc tube IB at a predetermined position in the outer tube OB.

The lower support frame 5 includes a U-shaped conductor 5a, a support band 5b, and a connection conductor 5c.

The base of the U-shaped conductor 5a is welded to the internal introduction conductor 3a4.

The support band 5b encloses the pinch seal portion 1a on the lower side of the arc tube IB, and has a U-shaped conductor 5a.
Are welded to the sides.

The connection conductor 5c has a distal end welded to molybdenum foil in the pinch seal portion 1a of the arc tube IB, and a proximal end welded to the U-shaped conductor 5a.

The upper support frame 6 is provided with a U-shaped conductor 6a, a support band 6b, a connection conductor 6c, and a steady rest 6d.

The U-shaped conductor 6a, the support band 6b, and the connection conductor 6c have the same structure as the lower support frame 5, but have a vertically inverted relationship.

However, the upper support frame 6 is provided with a steady rest 6d.
Is given to the inner surface of the outer tube OB. That is, the steady portion 6d is welded at the center to the side of the U-shaped conductor 6a, and the tip is loosely in contact with the inner surface of the outer tube OB.
Is steady.

In FIG. 1, the connection conductor 6c is connected to the internal introduction conductor 3a3 via the connection wire CW.

<Regarding the base B> The base B is made of an E39 screw base, and is screwed into a screw groove 3b formed around the sealing portion at the end of the outer tube OB, thereby forming the end of the outer tube OB. It is attached to.

As shown in FIG. 2, the base B has a shell 7, an eyelet glass 8, and a center contact 9 as shown in FIG.
It is provided with.

The shell 7 is formed of a conductive cylinder having a thread groove.

The eyelet glass 8 is attached to the lower end of the shell 8 in a ring shape.

The center contact 9 is fixed to the eyelet glass 8 and supported in an insulating relationship with the shell 7.

<Regarding the Starter ST> The starter ST includes the wiring board 10, the pulse generating means PG including the nonlinear capacitor Cnl, the pulse stopping means PS, and the safety means SF.

As shown in FIGS. 3 and 4, the wiring substrate 10 is formed by attaching a predetermined conductive pattern 10a to the lower surface of the alumina ceramic and forming
a6 insertion hole 10b, insertion hole 1 for connection conductor CC described later
0c and lead wire insertion holes (not shown) for circuit components not shown.

The pulse generating means PG comprises a nonlinear capacitor Cnl, a diac Dac and a resistor R1.

The pulse stopping means PS is provided with a thermally responsive switch T
S.

The safety means SF comprises a resistor R2.

Among the above means, the circuit component having a relatively high height during mounting is mounted on the upper surface of the wiring board 10 in FIG. The resistors R1 and R2 are mounted on the lower surface by forming a thick film.

The connection conductor CC is a conductor for connecting one end of the starter ST to the shell 7 of the base B. One end is inserted into the insertion hole 10c and connected to a predetermined position of the wiring pattern on the lower surface of the wiring board 10. The other end is narrowly fitted between the shell 7 and the thread groove 3b of the outer tube OB and is connected to the shell 7.

The external introduction conductor 3a6 is connected to the wiring board 1
No. 0 is inserted into the insertion hole 10b, the intermediate portion is connected to a predetermined position of the wiring pattern 10a, and the tip is soldered to the center contact 9 of the base B.

The circuit configuration of the starter ST will be described with reference to FIG.

FIG. 5 is a circuit diagram showing a high-pressure discharge lamp and a high-pressure discharge lamp lighting device according to a first embodiment of the present invention.

In the figure, the same parts as those in FIGS. 1 to 4 are denoted by the same reference numerals, and description thereof will be omitted. AS is an AC power supply, BR is a ballast, and MH is a metal halide lamp.

<About AC power supply AS> AC power supply AS
Is a commercial 200V AC power supply.

<About Ballast BR> The ballast BR is 2
00V high power factor mercury lamp ballast, single choke CH, power factor improving capacitor Cp and discharge resistor R3
It has.

The single choke CH is interposed in series between the metal halide lamp MH and the AC power supply AS, and is responsible for pulse voltage generation and current limiting.

The power factor improving capacitor Cp is
It is connected between the two poles of S and cancels the lagging current flowing in the load circuit formed by the single choke CH and the metal halide lamp MH by flowing the leading current, thereby improving the power factor.

The discharge resistor R3 is such that the ballast B has an AC power supply AS.
When separated from the power supply, the electric charge remaining in the power factor improving capacitor Cp is discharged to ensure safety.

<Regarding Metal Halide Lamp MH> The metal halide lamp MH has the structure shown in FIGS.

<Regarding the Starter ST> The starter ST includes a normally-closed thermal responsive switch TS, a nonlinear capacitor Cnl, and a diac Dac connected in series, and a diac Dac.
Is connected in parallel with a resistor R1.

Further, a resistor R2 is connected in parallel with the series portion of the nonlinear capacitor Cnl and the diac Dac.

Further, the external introduction conductor 3a6 is connected to the wiring board 1
0, and the middle portion is connected to a predetermined wiring pattern 10a, and the end is connected to the center contact 9 of the base B, thereby starting the starter ST.
Is connected to the center contact 9 of the base B.

Further, a diac Dac, a resistor R1
The other end of the starter ST is connected to the shell 7 of the base B by connecting the connection point of R2 and R2 to the shell 7 of the base B via the connection conductor CC.

<Circuit Operation> The circuit operation will be described focusing on pulse generation and its stop.

(1) When the lamp is normal When the AC power supply AS is turned on, two points are output from the output terminal of the ballast BR.
A voltage of 200 V, which is the next open voltage, is applied to the metal halide lamp MH. This voltage is also applied to the starter ST housed in the base B, and the pulse generating means PG starts operating because the thermally responsive switch TS of the pulse stopping means PS is normally closed.

That is, the ballast B is provided between both ends of the starter ST.
When the secondary open voltage of R is applied, the pulse generation means PG
Is applied with a secondary open-circuit voltage. At this time, since the non-linear capacitor Cnl is in the ON state before reaching the turnover voltage, the AC power supply AS, the single choke coil CH of the ballast B, the glow discharge switch GS, the non-linear capacitor Cnl, the resistor R1, and the AC A charging current flows through the path of the power supply AS, and electromagnetic energy is accumulated in the single choke coil CH.

On the other hand, the voltage drop of the resistor R1
When the phase of the AC half cycle equals the breakdown voltage of Dac, the diac Dac breaks down. As a result, a voltage having a large instantaneous value is suddenly applied to the nonlinear capacitor Cnl. Therefore, the nonlinear capacitor Cnl turns over and saturates rapidly. Accordingly, the current flowing through the single choke CH of the ballast B changes suddenly, so that a pulse voltage is generated by the back electromotive force and applied to the arc tube IB of the metal halide lamp MH. Then, the pulse voltage increases the electric field strength between the electrodes 2 and 2, so that the insulation of the ionized medium is broken and the lamp is started and turned on.

When the arc tube IB is turned on, the heat responsive switch TS is turned off by receiving the heat generated by the arc tube IB, and the starter ST stops the pulse generation operation by the pulse stopping means PS.

(2) Lamp failure When the starter ST operates and a pulse voltage is generated from the ballast BR and applied to the arc tube IB, the arc tube IB does not turn on. Through resistor R2
As a result, the resistor R2 generates heat,
The non-linear capacitor Cnl is heated by the generated heat. As a result, the nonlinear capacitor Cnl eventually reaches the Curie point, loses its capacitance, and enters a cutoff state. As a result, the pulse voltage generation stops. This state continues while the AC power supply AS is turned on.

(3) Momentary power failure The metal halide lamp MH goes out due to a momentary power failure.
When the arc tube IB cools, the starter ST starts operating again, so that it is turned on again.

FIG. 6 is an enlarged sectional view showing a main part of a high-pressure discharge lamp according to a second embodiment of the present invention.

FIG. 7 is a circuit diagram showing a high-pressure discharge lamp and a high-pressure discharge lamp lighting device according to a second embodiment of the present invention. In each of the drawings, the same parts as those in FIGS. The description is omitted.

In the present embodiment, the configuration of the starter ST is different.

That is, the starter ST has a through hole 10d for the exhaust pipe 4 in the center of the wiring board 10, and the exhaust pipe 4
Is stored in the base B in a state of being inserted through the base B.

Further, on the surface of the wiring board 10 on the side of the arc tube 1B, a thermally responsive switch TS serving as a pulse stopping means PS and a safety means SF is mounted.

The heat responsive switch TS includes a normally closed bimetal switch TSa and a heating element R4.

The bimetal switch TSa is connected to the arc tube IB
And the heat generated by the heating element R4.

Further, a non-linear capacitor Cnl and a diac Dac are mounted on the surface of the wiring board 10 opposite to the arc tube IB.

Since the thermally responsive switch TS is mounted on the arc tube IB side of the wiring board 10, the arc tube IB
Responsiveness to generated heat is improved.

Further, since the non-linear capacitor Cnl and the diac Dac are mounted on the surface of the wiring board 10 on the side opposite to the arc tube IB, the semiconductor components can be thermally protected by the heat shielding effect of the wiring board 10. .

FIG. 8 is a front view showing a third embodiment of the high-pressure discharge lamp of the present invention.

FIG. 9 is a circuit diagram showing a high-pressure discharge lamp and a high-pressure discharge lamp lighting device according to a third embodiment of the present invention. In each of the drawings, the same parts as those in FIGS. The description is omitted.

The present embodiment is a high-pressure sodium lamp having a rated lamp power of 360 W. In addition, the self-cutting device SM
The feature is that it has.

The arc tube IB has a structure in which the light-transmitting discharge vessel 1 is mainly composed of an elongated tube made of light-transmitting alumina ceramics, and a pair of electrodes 2 is provided at both ends thereof through a feed conductor FC made of a niobium tube. While sealing 2,
Sodium amalgam and xenon 100 torr inside
And is enclosed.

The interior of the outer tube OB is evacuated to a vacuum.

In order to fix the arc tube IB at a predetermined position in the outer tube OB, a support frame 5 'is provided. The support frame 5 ′ includes a conductor frame 5′a, a pair of support bands 5′b, 5 ′.
c and a steady rest 5'd.

The conductor frame 5'a is vertically long, and the base end is welded to the internal introduction conductor 3a3.

The support band 5′b is welded to the conductor frame 5′a on the upper and lower sides of the power supply conductor FC of the arc tube IB.

The support band 5'c supports the lower power supply conductor FC insulatively via the insulating sleeve s, and is welded to the conductor frame 5'a on both left and right sides.

The self-cutting device SM comprises an easily-cutting conductor MC and a fusing electrode EM.

The easily fusible conductor MC is made of a thin ribbon conductor of nickel, and is interposed between the power supply conductor FC connected to the lower electrode 2 and the internal introduction conductor 3a4 in the figure.

The fusing electrode EM is composed of a shaft portion a and a coil portion b. The base end is welded to the U-shaped conductor 5a, and the front end is fixed at a position close to the easily fusing conductor MC.

Therefore, the self-blown device SM is connected in parallel with the arc tube IB to the output terminal of the ballast BR.

When a leak occurs in the arc tube IB, the xenon sealed in the arc tube IB is removed from the outer tube OB.
, The surroundings of the self-cutting device SM become a xenon atmosphere, so that a discharge occurs between the fusing electrode EM and the easily-cutting conductor MC, and a large current flows through the self-cutting device EM. When this current flows, heat is generated and the fusing conductor MC is blown.

When the easily fusible conductor MC is blown, power is not supplied to the power supply conductor FC, so that the discharge of the arc tube IB is stopped and safety is achieved.

On the other hand, in the starter ST, the safety means SF is double-structured by the resistor R2 and the thermally responsive switch TS.

That is, first, there is provided a structure for performing a safety operation in which the nonlinear capacitor Cnl is heated by the resistor R2 to a temperature higher than the Curie point to eliminate the capacitance and stop the pulse generation operation.

Second, a normally-closed thermoresponsive switch TS
A heating element R4 for heating a is provided. This allows
Since the heating element R4 is continuously energized when the arc tube IB is at a point, heat is generated and the bimetal switch TSa is opened.

FIG. 10 is a sectional view of a lighting device for a tunnel in one embodiment of the lighting device of the present invention.

In the figure, 11 is a high-pressure sodium lamp, and 12 is a lighting device main body.

The high-pressure sodium lamp 11 has the same specifications as those shown in FIGS.

The lighting device main body 12 comprises a box 12a, a reflector 12b, a stabilizer 12c, mounting ears 12d, a translucent glass plate 12e, and the like.

The box body 12a has a light emitting opening 12a1 on the front surface.

The reflecting plate 12b is housed in the box 12a, is opposed to the light projecting opening 12a1, and has a lamp mounting hole on the side surface. Therefore, the high pressure sodium lamp 1
1 is mounted horizontally and lit.

The ballast 12c has the same specification as that shown in FIG. 9, and is arranged inside the box 12a on the back side of the reflection plate 12b.

The mounting ear 12d is fixed to the back side of the box 12a.

The translucent glass plate 12e covers the light projecting opening 12a1 of the box body 12a through the packing 12e1 in a rainproof manner.

[0177]

According to the first to third aspects of the present invention, a hollow base is provided at one end of an outer pipe having a sealing portion at one end and an exhaust pipe protruding from the sealing portion so as to enclose the exhaust pipe. The wiring board of the starter, which is equipped with a heat-resistant wiring board, a pulse generating means including a non-linear capacitor, and a pulse stopping means including a heat responsive switch which responds to the heat generated by the arc tube, is substantially aligned with the axis of the outer tube. The starter is arranged in the base with the heat-responsive switch of the pulse stopping means positioned closer to the arc tube than the wiring board, making it easy to incorporate the wiring board into the base and stopping the pulse. By arranging the thermoresponsive switch of the means so as to easily respond to the heat generated by the arc tube, and by arranging circuit components such as the thermoresponsive switch by utilizing the space formed around the exhaust pipe, Inside the base By increasing the mounting density even in a narrow space, it is possible to provide a high pressure discharge lamp accommodating the starter so as to exert the desired function.

According to the second aspect of the present invention, since the semiconductor component such as the non-linear capacitor is mounted on the side of the wiring board opposite to the arc tube, the semiconductor part is kept within the allowable temperature range by the heat shielding effect of the wiring board. It is possible to provide a high-pressure discharge lamp which can be easily maintained.

According to the invention of claim 3, in addition, at least sodium and xenon are sealed in the arc tube, and the fusing easily inserted in series between one electrode of the arc tube and the base in the outer tube. Self-cutting device equipped with a fusing electrode connected to the conductive conductor and the other electrode and having a fusing electrode spaced apart from and facing the easily fusing conductor, so that the self-cutting device operates when a leak occurs in the arc tube. As a result, a high-pressure discharge lamp in which power supply to the electrodes is cut off can be provided.

According to the invention of claim 4, it is possible to provide a high pressure discharge lamp lighting device having the effects of claims 1 to 3.

According to the fifth aspect of the present invention, it is possible to provide a lighting device having the effects of the first to third aspects.

[Brief description of the drawings]

FIG. 1 is a front view showing a high-pressure discharge lamp according to a first embodiment of the present invention.

FIG. 2 is a sectional view of an enlarged main part of the same.

FIG. 3 is an enlarged plan view of the same starter.

FIG. 4 is an enlarged bottom view of the same starter.

FIG. 5 is a circuit diagram showing a first embodiment of a high-pressure discharge lamp and a high-pressure discharge lamp lighting device of the present invention.

FIG. 6 is an enlarged sectional view of an essential part showing a second embodiment of the high-pressure discharge lamp of the present invention.

FIG. 7 is a circuit diagram showing a high-pressure discharge lamp and a high-pressure discharge lamp lighting device according to a second embodiment of the present invention.

FIG. 8 is a front view showing a third embodiment of the high-pressure discharge lamp of the present invention.

FIG. 9 is a circuit diagram showing a third embodiment of the high-pressure discharge lamp and the high-pressure discharge lamp lighting device of the present invention.

FIG. 10 is a sectional view showing a lighting device for tunnel lighting in one embodiment of the lighting device of the present invention.

[Explanation of symbols]

 OB: outer tube 3: sealing portion 3a: flare stem 3a1: pinch seal portion 3a2: flare 3a3: internal introduction conductor 3a4: internal introduction conductor 3a5: external introduction conductor 3a6: external introduction conductor 3b: screw groove portion 4: exhaust pipe 4a ... Chip off part B ... Base 7 ... Shell 8 ... Eyelet glass 9 ... Center contact ST ... Starter 10 ... Wiring board PG ... Pulse generating means Cnl ... Non-linear capacitor Dac ... Diac PS ... Pulse stopping means TS ... Thermal switch CC ... Connection conductor

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Shinji Atago 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Inside Toshiba Litec Corporation (72) Inventor Shigemi Oku 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo No. Toshiba Litec Corporation F-term (reference) 3K083 AA91 BA19 BC04 BC16 BC33 CA37

Claims (5)

[Claims] 1. A light-emitting tube having a pair of electrodes sealed at both ends of a translucent discharge vessel and an ionization medium sealed therein; a sealing portion formed at one end and a tip-off portion formed at the tip and sealed. An outer tube provided with an exhaust tube protruding from a portion thereof and containing the arc tube therein; a hollow base attached to one end of the outer tube so as to include the exhaust tube and connected to an electrode of the arc tube; A pulse stopping means including a heat-resistant wiring board, a pulse generating means including a non-linear capacitor, and a heat responsive switch for stopping a pulse generating operation in response to heat generated by the arc tube, wherein the surface of the wiring board is connected to the axis of the outer tube. And a starter disposed substantially in the base with the thermally responsive switch positioned closer to the arc tube than the wiring board. 2. The high-pressure discharge lamp according to claim 1, wherein the starter has a semiconductor component such as a non-linear capacitor mounted on a side of the wiring board opposite to the arc tube. 3. An arc tube in which a pair of electrodes are sealed at both ends of a translucent discharge vessel and an ionization medium containing at least Na and xenon is sealed therein; a sealing portion at one end and a tip-off portion at a tip. An outer tube formed and provided with an exhaust tube protruding from the sealing portion and containing the arc tube therein; attached to one end of the outer tube so as to include the exhaust tube and connected to an electrode of the arc tube; A hollow base; a fusing conductor inserted in series between one electrode of the arc tube and the base in the outer tube and connected to the other electrode of the arc tube and spaced apart from the fusing conductor; Self-fusing device that has a fusing electrode that has been cut and that causes a discharge between the fusing conductor and the fusing electrode when the arc tube leaks to blow the fusing conductor; including a heat-resistant wiring board and a nonlinear capacitor Pulse generation means and A pulse stopping means including a thermoresponsive switch for stopping a pulse generating operation in response to heat generated by the arc tube, wherein the surface of the wiring board is substantially orthogonal to the axis of the outer tube and the thermoresponsive switch is moved from the wiring board to the arc tube; A high pressure discharge lamp, characterized in that it comprises: 4. A high-pressure discharge lamp according to claim 1, further comprising: a high-pressure discharge lamp interposed between the AC power supply and the high-pressure discharge lamp to generate a pulse voltage in accordance with the operation of the starter. And a ballast functioning as a current limiting means. 5. A lighting device comprising: a lighting device main body; and the high-pressure discharge lamp according to claim 1 mounted on the lighting device main body.