JP2002175703A - High-pressure discharge lamp device and lighting system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp device miniaturized by increasing the operation frequency of a lighting circuit means in a range within a resonant frequency by providing a translucent ceramic discharge container having a resonant frequency of a nearly single mode and capable of increasing it and provide a lighting system using it. SOLUTION: This device is provided with: a high-pressure discharge lamp 11 comprising the translucent ceramic discharge container 1 having a surrounding part 1a surrounding a discharge space and forming a nearly spherical shape having a sphericity of 0.6-1.0 and the maximum inside diameter of 2.0-5.5 mm, and a pair of electrodes 2 oppositely present in the surrounding part 1a, having a discharge medium enclosed in the surrounding part 1a, and having lamp power of 50 W or less; and the lighting circuit means 12 for lighting the high-pressure discharge lamp at a high frequency wherein a/f equals 0.4 or less when it is assumed that the operation frequency is f (kHz) and the inside diameter is a (mm).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a high-pressure discharge lamp provided with a translucent ceramic discharge vessel, a high-pressure discharge lamp device provided with lighting circuit means for lighting the high-pressure discharge lamp, and a lighting device using the same. .

[0002]

2. Description of the Related Art In recent years, a compact and highly efficient light source has been desired.

[0003] High-pressure discharge lamps, compared to fluorescent lamps,
Although it is possible to reduce the size of the lamp itself, the lighting circuit means for lighting the lamp becomes large, so that when viewed as a lamp device in which the lighting circuit means is generally integrated, it is considered as a small light source. Is inferior to fluorescent lamps. However, if the high-pressure discharge lamp can be lit at high frequency, downsizing of the lighting circuit means can be expected up to a lamp power of about 50 W. However, in the case of a high-pressure discharge lamp, there is a problem of arc flickering and extinguishing due to an acoustic resonance phenomenon, so that it has been difficult to commercialize the lamp in a sufficiently miniaturized form. For example, Japanese Patent Application Publication No. 11-509680 discloses a shell, a discharge device disposed in the shell,
An integrated HID reflector lamp is disclosed that includes, as constituents, a reflecting surface disposed in a shell for reflecting light from the discharge device and a ballast disposed in the shell. Each component of the integrated HID reflection lamp has the following structure. That is, the shell is formed by molding a synthetic resin, and integrally includes an inverted truncated cone-shaped cup-shaped portion and a base portion integrally projecting from the truncated portion, and includes a screw-type base on the base portion. . The discharge device has a pair of electrodes disposed inside a cylindrical light-emitting portion having an inner diameter of 3 mm and a length of 3 mm of a translucent ceramic discharge vessel made of polycrystalline aluminum oxide so that the distance between the electrodes is 2 mm. 2.3 mg of mercury with a molar ratio of 90: 1.4: 8.
3.5 mg of NaI, DyI3 and TlI halides and Ne3 as starting and buffer gas.
% -Ar is enclosed.

The reflecting surface has a structure in which the opening surface of a molded glass reflector is sealed inside with a glass lens. Then, the discharge device is arranged inside the reflection surface so that the emission center coincides with the focal point of the reflection surface, and Kr and N2 are sealed inside the reflection surface. Further, the reflection surface is fixed to the opening of the cup-shaped portion of the shell.

[0005] When the discharge device is covered with an ultraviolet-blocking sleeve, the emitted ultraviolet rays are blocked by the sleeve.

The ballast converts the direct current output of the rectifier circuit into a high frequency by a half-bridge type DC-AC inverter, and applies it to a high-pressure discharge lamp through a resonance output circuit composed of an LC network to turn on the ballast. Circuit and 50 firing pulses with a repetition frequency of 400 ms
There is a stop circuit that occurs for ms. Thus, in the above-described prior art, the minimum resonance frequency of the discharge device is 30 kHz or more, and the nominal lamp power is 20 W
It is. On the other hand, the operating frequency of the ballast's basic lamp current is selected to be 24 kHz, which is higher than the audible frequency of 19 kHz but is clearly lower than the lowest resonance frequency. As a result, the discharge device is turned on, avoiding acoustic resonance, input power 22 W, total luminous flux 1320 lm
/ W and lighting at a luminous efficiency of 60 lm / W. The integrated HID reflecting lamp is a known 60 W PAR having a light emitting portion of an infrared reflecting halogen lamp.
It is described that the size is approximately fit in the outer shape of a 38 lamp and a 90 W halogen PAR38 lamp.

[0007]

However, the above-mentioned integrated HID reflecting lamp of the prior art has an aperture diameter of PA.
135mm approx. R38 type lamp, 135mm tube length
mm, and the weight is estimated to reach about 1 kg, so that it is large and very large. Lighting using spotlights and downlights in stores and the like requires a smaller and lighter light source, such as a halogen bulb with a reflector,
Even with a rated power consumption of 65 to 75 W and a total luminous flux of about 1250 lm, a reflector having an opening diameter of 50 mm is used.
Also in the high-pressure discharge lamp device, various illuminations can be performed easily and easily by realizing the miniaturization corresponding to this. However, in the above-described prior art, it is impossible to further reduce the size and weight of the ballast because the operating frequency is low. Because the lowest resonance frequency of the discharge device is 30 kHz or more, the operating frequency must be clearly lower than the resonance frequency in order to avoid the acoustic resonance phenomenon.

According to the investigation by the present inventors, it was found that the lowest resonant frequency of the prior art discharge device was caused by the cylindrical shape of the transparent ceramic discharge vessel. That is, when the translucent ceramics discharge lamp has a cylindrical shape, the mode of the resonance frequency is complicated, and as a result, the lowest resonance frequency is lowered.

On the other hand, it is known that the problem of acoustic resonance can be avoided by operating the high-pressure discharge lamp at a frequency sufficiently higher than the fundamental frequency, which is the lowest frequency of acoustic resonance, for example, about 10 times. However, when the operating frequency is very high, radiation noise and line noise become extremely strong. If this problem is dealt with by a radio wave shield, there is a problem that the high-pressure discharge lamp device eventually becomes large.

According to the present invention, a light-transmitting ceramic discharge vessel having a resonance frequency of substantially a single mode and having a high resonance frequency is provided, so that the operating frequency of the lighting circuit means is increased within the range of the resonance frequency or less. It is an object of the present invention to provide a high-pressure discharge lamp device and a lighting device using the same.

[0011]

The high pressure discharge lamp device according to the present invention has a substantially spherical shape with a sphericity of 0.6 to 1.0 and has a maximum inner diameter a surrounding the discharge space of 2. 0 to
A lamp comprising: a translucent ceramic discharge vessel having an enclosing portion of 5.5 mm; a pair of electrodes existing in the enclosing portion of the translucent ceramic discharge vessel; and a discharge medium sealed in the translucent ceramic discharge vessel. A high-pressure discharge lamp having a power of 50 W or less;
z) lighting circuit means for lighting at a high frequency where a / f is within 0.4 when the maximum inner diameter a (mm) is obtained.

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

[About high pressure discharge lamp]

<Transparent Discharge Vessel>

The translucent ceramics discharge vessel has at least an enclosing portion surrounding the discharge space, and the enclosing portion is formed of translucent ceramics. Note that the term “light-transmitting” means light-transmitting to the extent that light generated by electric discharge can be transmitted to the outside and may be not only transparent but also light-diffusing. Further, even in the case where the translucent ceramics discharge vessel includes, for example, a small-diameter cylindrical portion in addition to the enclosing portion, it is sufficient that at least the enclosing portion has translucency. It may be light-shielding. "Translucent ceramics"
A single-crystal metal oxide such as sapphire and a polycrystalline metal oxide such as a translucent hermetic aluminum oxide;
Yttrium-aluminum-garnet (YAG),
A material having light transmittance and heat resistance, such as yttrium oxide (YOX) and a polycrystalline non-oxide such as aluminum nitride (AlN).

The surrounding portion surrounds mainly a positive column of a discharge generated between the electrodes during lighting. The surrounding portion has a spherical shape with a sphericity of 0.6 to 1.0 and a maximum inner diameter a of 2.0 to 5.5 mm. Hereinafter, the sphericity will be described with reference to FIG.

FIG. 1 is an explanatory diagram for explaining the sphericity of the surrounding portion of the transparent ceramics discharge vessel in the discharge lamp device of the present invention.

In the figure, 1 is a translucent ceramic container, 1a is an enclosing portion, 1b is a small-diameter cylindrical portion, x is a central axis, and y is an axis perpendicular to the central axis.

The translucent ceramics container 1 is formed by molding translucent ceramics, and has a total length of L.

The surrounding portion 1a is made of a translucent ceramic container 1.
And has a substantially spherical shape with a given sphericity Rb. The surrounding portion 1a has a maximum inner diameter a and a maximum outer diameter Oa along an axis y perpendicular to the central axis x,
And an axial length b along the central axis x. In the present invention, the maximum inner diameter a refers to a length in a direction perpendicular to the lamp axis.

The small-diameter cylindrical portion 1b is integrally formed so as to protrude from both ends of the surrounding portion 1a along the central axis x, and has communication holes 1b1 formed therein along the central axis. It has lengths L1 and L2. The communication hole 1b1 has an inner end communicating with the surrounding portion 1a and an outer end communicating with the outside.

The small-diameter cylindrical portion 1b is formed with a small gap, also referred to as a capillary, between the inner surface and the electrode by inserting an electrode to be described later into the small-diameter cylindrical portion 1b. Can be used to seal containers.

The sum L1 of the lengths of the pair of small-diameter cylindrical portions 1b is L1.
+ L2 is a value obtained by subtracting the axial length b of the surrounding portion 1a from the total length L of the translucent ceramics discharge vessel 1. And then
The axial length b of the surrounding portion 1a is an extension of a straight line 1 connecting the intersection point P1 between the axis y and the inner surface of the surrounding portion 1a and the inner surface P2 of the round portion at the boundary between the surrounding portion 1a and the small-diameter cylindrical portion 1b. Is defined as P3, where P3 intersects the central axis x, and P3 and P3
3 means the distance between them. The sphericity RB is given by the following equation from the maximum inner diameter a and the axial length b of the surrounding portion 1a.

RB = a / b

In the present invention, the sphericity RB is 0.6 to
1.0 and the maximum inner diameter is set to 2.0 to 5.5 mm. The value of the sphericity RB is such that the boundary between the surrounding portion 1a of the translucent ceramics discharge vessel 1 and the small-diameter cylindrical portion 1b, that is, the inner surface P2 is angular, and the inner diameter of the through hole 1b1 of the small-diameter cylindrical portion 1b is small. Moreover, if the surrounding portion 1a is a perfect sphere, it approaches 1. However, sphericity RB
Is affected by the size of the radius of the inner surface P2 and the size of the inner diameter of the small-diameter cylindrical portion 1b.
And, the size of the radius of the inner surface P2 can be affected and changed by the method of manufacturing the translucent ceramics discharge vessel. The inner diameter of the through hole 1b1 of the small-diameter cylindrical portion 1b is influenced by the diameter of the electrode and the gap size of the slight gap depending on the lamp design. Further, since these methods do not significantly affect the resonance frequency, in the present invention, the sphericity RB is defined as described above in consideration of some design latitude. In the present invention, when the sphericity RB is 0.65, the shape of the surrounding portion of the translucent ceramics discharge vessel is generally somewhat oblong, somewhat similar to a spheroid having a major axis in the axial direction. However, this includes a substantially spherical shape. Further, even if the sphericity RB is a value exceeding 1, there is a substantially spherical range slightly expanded in the y-axis direction rather than the x-axis direction in FIG. Therefore, sphericity RB
Is generally allowed to be about 1.2, preferably up to 1.1.

Further, in the present invention, the inner volume of the translucent ceramics discharge vessel is not limited, but in order to obtain a small high-pressure discharge lamp, the translucent ceramics discharge vessel must be 0.04 cc or less. Preferably 0.03cc
It is better to do the following.

The maximum inner diameter a (mm) of the spherical portion and the frequency f (k
Hz), acoustic resonance is reduced when a / f is within 0.4.

<About electrodes>

The electrode is located in the surrounding portion of the light-transmitting ceramic discharge vessel, and is made of tungsten or doped tungsten. Note that “presence” means a state in which a discharge is formed in the surrounding portion. Therefore, the electrode is preferably in a state where at least its main part is located inside the surrounding part, but is not directly located in the surrounding part if necessary, such as being located in the small-diameter cylindrical part if necessary. It may be.

<About the discharge medium>

The discharge medium contains at least dysprosium and a halogen atom, and is sealed in a translucent ceramic discharge vessel so as to exhibit a pressure of about 1 atm or more during lighting. Dysprosium has an atomic weight greater than scandium, which is often used as a luminescent metal, and thus has the effect of increasing the molecular weight, which lowers the speed of sound. As a result, the acoustic resonance frequency can be lowered, and a wide range of lighting frequency characteristics can be realized.

<Other Configurations>

(1) Power supply conductor

A preferred configuration for supplying power to the electrodes and sealing the translucent ceramic discharge vessel is as follows:
This is to use the following power supply conductor.

That is, the power supply conductor is a conductor that functions to apply a voltage between the electrodes, supply a current to the electrodes, and seal the translucent ceramics discharge vessel. Connected and the base end is led out of the translucent discharge vessel. In addition, the phrase “leaded out of the light-transmitting discharge vessel” may or may not protrude from the light-transmitting discharge vessel to the outside, but may not be protruded from the outside through the connection conductor. It means that you are outside enough to supply power.

(2) Lamp power

The lamp power of the high-pressure discharge lamp is specified to be 50 W or less, preferably 15 to 25 W. The reason why the lighting circuit means can be minimized is that the lighting circuit means is limited to a case of low power of 50 W or less at most. In the present invention, `` lamp power '' means that when the high-pressure discharge lamp device is connected to a power supply having a rated voltage, the high-pressure discharge lamp is lit by lighting circuit means provided for lighting the high-pressure discharge lamp. Means the power consumed by the high pressure discharge lamp.

On the other hand, the tube wall load (w / cm 2) is 28 to 16
It is desirable to set it to 0.

[About lighting circuit means]

The lighting circuit means is provided for lighting the high-pressure discharge lamp at a high frequency of 15 to 30 kHz.
Any other configuration does not matter. That is, it is possible to light the operating frequency at a clearly higher frequency than that of the related art while avoiding the acoustic resonance phenomenon, thereby making it possible to significantly reduce the size and weight as compared with the related art.

Incidentally, the basic circuit configuration of the lighting circuit means may be any configuration. For example, a circuit configuration mainly including a half-half-bridge type inverter, a full-bridge type inverter, a parallel inverter, a single-type inverter such as a blocking oscillation type inverter may be used. However, half-bridge type inverters
Since the circuit configuration is simple and the number of circuit components used is small, it is suitable for obtaining a small, lightweight, and inexpensive lighting circuit means.

[Operation of the present invention]

In the present invention, the surrounding portion of the translucent ceramics discharge vessel has a sphericity of 0.6 to 1.0 and a maximum inner diameter a.
(Mm) is approximately spherical from 2.0 to 5.5 mm, and a /
By setting f to 0.4 or less, the resonance frequency of the translucent ceramics discharge vessel becomes substantially single mode and increases. Thereby, the operating frequency f of the lighting circuit means
However, even at 15 to 30 kHz, the high-pressure discharge lamp can be operated sufficiently stably without causing an acoustic resonance phenomenon.

In addition, since the discharge vessel is made of ceramics, manufacturing variations of the bulb shape and size on an industrial scale are extremely reduced. In addition, since the lamp is lit at the above frequency, the variation of the frequency is, for example, ± 1 to 3 kHz.
Since it is reduced to about z, it is possible to light up as close to the resonance frequency as possible within a safe range. This leads to an increase in the operating frequency of the lighting circuit means, which contributes to downsizing. It is conceivable that an ordinary inexpensive lighting circuit will vary by about + -10% of the operating frequency, but the present invention can sufficiently tolerate this variation.

Further, in the present invention, a high-pressure discharge lamp device having a high lamp efficiency and a long life can be obtained.

The high pressure discharge lamp device according to the second aspect of the present invention
A translucent ceramics discharge vessel having an almost spherical shape having a sphericity of 0.6 to 1.0 and having an enclosing portion having a maximum inner diameter a of 2.0 to 5.5 mm surrounding the discharge space, A high-pressure discharge lamp having a pair of electrodes existing in the surrounding portion of the ceramic discharge vessel and a discharge medium containing dysprosium and halogen atoms sealed in the translucent ceramic discharge vessel and having a lamp power of 15 to 25 W; Lighting circuit means for lighting at a high frequency where a / f is 0.37 or less when the high-pressure discharge lamp has an operating frequency f (kHz) and a maximum inner diameter a (mm).

The present invention defines the preferred scope of claim 1.

The high pressure discharge lamp device according to the third aspect of the present invention
The high-pressure discharge lamp device according to claim 1 or 2,
The lighting circuit means is mainly constituted by an LC resonance type high frequency inverter.

According to the present invention, a circuit structure is simple, small, and inexpensive and suitable for lighting circuit means.

That is, as the LC resonance type high frequency inverter, there are a half bridge type inverter, a single-type inverter such as a blocking oscillation type inverter, a parallel inverter and the like.

The high frequency inverter of the LC resonance type is
An LC resonance circuit is provided, and the output voltage of the ballast can be changed as desired by a relatively simple circuit configuration. For example, when the oscillation frequency is constant, the output voltage of the ballast can be controlled by configuring the resonance frequency of the LC resonance circuit to change according to the situation.
That is, when no load is applied, the inductor L of the LC resonance circuit saturates and its inductance decreases, and the resonance frequency increases and approaches the oscillation frequency, so that the output voltage of the ballast increases. At load, LC according to lamp current
The saturation of the inductor of the resonance circuit disappears, the resonance frequency moves away from the oscillation frequency, and the output voltage decreases accordingly.

However, even in the case where the oscillation frequency changes, the output voltage can be changed as desired. That is, if the oscillation frequency approaches the resonance frequency of the LC resonance circuit at the time of startup, the output voltage of the ballast increases, and
The next open voltage can be made closer to the discharge starting voltage of the high pressure discharge lamp. After lighting, if the oscillation frequency is separated from the resonance frequency of the LC resonance circuit, the output voltage decreases.

Further, since the ballast has the LC resonance circuit, the waveform of the output voltage can be made a sine wave.

According to a fourth aspect of the present invention, there is provided a lighting device comprising: a lighting device main body; and the high-pressure discharge lamp device according to the third aspect supported by the lighting device main body.

In the present invention, the lighting device is a broad concept including any device that uses the light emission of the high-pressure discharge lamp device for any purpose. For example, the present invention can be applied to a lighting fixture, a headlight for a moving object, a light source device for an optical fiber, an image projection device, a photochemical device, a fingerprint discrimination device, and the like. Note that the lighting device body refers to the remaining portion of the lighting device except for the high-pressure discharge lamp device. The “bulb-type high-pressure discharge lamp” is a type of incandescent lamp that is obtained by integrating a high-pressure discharge lamp and its ballast, and further attaching a power receiving base to a lamp socket adapted to the base. Means a lighting device configured to be used as if it were turned on. The lighting fixture has a configuration in which a bulb-type high-pressure discharge lamp is mounted.

[0056]

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

FIG. 2 is a front elevational view in central section showing a first embodiment of the high-pressure discharge lamp device of the present invention.

FIG. 3 is a longitudinal sectional view of the high-pressure discharge lamp showing a state where only the upper side is assembled and sealed.

In each of the drawings, the high-pressure discharge lamp device includes a high-pressure discharge lamp 11 and lighting circuit means 12 integrated with the high-pressure discharge lamp 11 as essential components. In addition, a reflecting mirror 13, a case 14, and a power receiving unit 15 are provided. Hereinafter, each component will be described.

<Regarding the high pressure discharge lamp 11>

As shown in FIG. 3, the high-pressure discharge lamp 11 includes a translucent ceramic discharge vessel 1, a pair of electrodes 2, a power supply conductor 3, a first seal 4, a ceramic washer 5,
It has an external lead wire 6, a second seal 7, and a discharge medium not shown in the drawing. Note that FIG. 3 shows a state where only the upper side is assembled and sealed for easy understanding of the configuration, but actually has a vertically symmetric structure.

As described with reference to FIG. 1, the translucent ceramic discharge vessel 1 includes a substantially spherical surrounding portion 1a and a pair of cylindrical small-diameter cylindrical portions 1b and 1b formed by integral molding. The electrode 2 is supported by a power supply conductor 3 to be described later, and its tip protrudes into the enclosing portion 1a, faces at a small interval, and sets a predetermined inter-electrode distance between a pair of electrodes 2 (not shown). are doing. Further, a small gap g called a capillary is formed between the electrode 2 and the inner surface of the small-diameter cylindrical portion 1b.

The power supply conductor 3 is made of a sealing metal, is inserted into the small-diameter cylindrical portion 1b of the translucent ceramic discharge vessel 1 from the tip to the middle, and is sealed by a first seal 4 described later. Fixed, with the proximal end slightly exposed to the outside. In addition, the base end of the electrode 2 is welded to the distal end of the power supply conductor 3 to be integrally supported.

The first seal 4 is interposed between the small-diameter cylindrical portion 1b and the power supply conductor 3, and the transparent ceramic discharge vessel 1
Are hermetically sealed, and the electrode 2 is fixed at a predetermined position. Then, in order to form the first seal 4, a ceramic sealing compound is applied to the end face of the small-diameter cylindrical portion 1b around the power supply conductor 3 protruding outside from the small-diameter cylindrical portion 1b, and is heated and melted. Into the gap between the power supply conductor 3 and the inner surface of the small-diameter cylindrical portion 1b.
In addition to covering the entirety of the power supply conductor 3 inserted therein, the base end of the electrode 2 is further covered. The ceramic washer 5 has a central through-hole 5 a and surrounds the connection between the power supply conductor 3 and the external lead wire 6. The external lead wire 6 is made of an oxidation-resistant metal, is welded to the base end of the power supply conductor 3, and extends in the same direction as the power supply conductor 3. Second
The seal 7 surrounds a base end portion of the power supply conductor 3 exposed to the outside from the small-diameter cylindrical portion 1b around the inside of the through hole 6a of the ceramic washer 6. Therefore, the power supply conductor 3
Is completely covered by the first and second seals 4,7. As the discharge medium, a luminescent metal halide, mercury and a rare gas are sealed.

<Regarding the lighting circuit means 12>

FIG. 4 is a circuit diagram showing lighting circuit means in the first embodiment of the high-pressure discharge lamp device of the present invention. Hereinafter, the lighting circuit means 12 will be described with reference to FIG. In this embodiment, a lighting circuit means for a fluorescent lamp mainly including a half-bridge type high-frequency inverter is used.

In the figure, AS is a low-frequency AC power supply, f is an overcurrent fuse, NF is a noise filter, RD is a rectified DC power supply, Q1 is a first switching means, and Q2 is a second switching means.
Switching means, GD is a gate drive circuit, ST
Is a starting circuit, GP is a gate protection circuit, and LC is a load circuit. The low-frequency AC power supply AS is a 100 V commercial power supply. The overcurrent fuse f is a pattern fuse formed integrally with the wiring board, and protects the circuit from being burned when an overcurrent flows and burnt out.

The noise filter NF includes an inductor L1 and a capacitor C1, and removes a high frequency generated by the operation of the high frequency inverter so as not to flow out to the power supply side.

The rectified DC power supply RD comprises a bridge-type rectifier circuit BR and a smoothing capacitor C2. The AC input terminal of the bridge-type rectifier circuit BR is connected to a low-frequency AC power supply AS via a noise filter NF and an overcurrent fuse f. A DC output terminal is connected to both ends of the smoothing capacitor C2 to supply a smoothed DC. The first switching means Q1 is composed of an N-channel MOSFET, and has a drain connected to the positive side of the smoothing capacitor C2. The second switching means Q2 is composed of a P-channel MOSFET, and its source is connected to the source of the first switching means Q1, and its drain is connected to the minus side of the smoothing capacitor C2.

Therefore, the first and second switching means Q1, Q2 are connected in series in the forward direction, and both ends are connected between the output terminals of the rectified DC power supply RD.

The gate drive circuit GD includes a feedback circuit FB
C, series resonance circuit SRC and gate voltage output circuit GO
Consists of

The feedback means FBC comprises an auxiliary winding magnetically coupled to a current limiting inductor L2 described later. The series resonance circuit SRC is composed of a series circuit of an inductor L3 and a capacitor C3, both ends of which are connected to feedback means FBC. The gate voltage output means GO is connected to the series resonance circuit SR.
The resonance voltage appearing at both ends of the capacitor C3 of C is taken out via the capacitor C4. One end of the capacitor C4 is connected to a connection point between the capacitor C3 and the inductor L3, and the other end of the capacitor C4 is connected to respective gates of the first and second switching means Q1, Q2. Further, the other end of the capacitor C3 is connected to the sources of the first and second switching means Q1, Q2. As a result, the resonance voltage appearing at both ends of the capacitor C3 is applied between the gate and source of the first and second switching means Q1, Q2 via the gate voltage output circuit GO.

The starting circuit ST includes resistors R1, R2, R3
Consists of One end of the resistor R2 has a smoothing capacitor C.
2 and the other end is connected to the gate of the first switching means Q1. One end of the resistor R2 and the output terminal on the gate side of the gate voltage output circuit GO of the gate drive circuit GD, that is, the capacitor. It is connected to the other end of C4. The other end of the resistor R2 is connected to a series resonance circuit S
It is connected to the connection point between the inductor L3 of RC and the feedback circuit FBC. The resistor R3 has one end connected to the connection point of the first and second switching means Q1, Q2, that is, the source and the source side of the gate voltage output circuit GO, and the other end connected to the negative side of the smoothing capacitor C2. are doing. The gate protection circuit GP includes a pair of zener diodes connected in anti-series, and a gate voltage output circuit G
O is connected in parallel.

The load circuit LC comprises a high-pressure discharge lamp HPL,
It comprises a series circuit of a current limiting inductor L2 and a DC cut capacitor C5, and a resonance capacitor C6 connected in parallel to the high-pressure discharge lamp HPL. One end is connected to the connection point of the first and second switching means Q1, Q2, and the other end is connected. It is connected to the drain of the second switching means Q2. The high-pressure discharge lamp HPL has the configuration shown in FIG. The current limiting inductor L2 and the resonance capacitor C6 form a series resonance circuit. Since the DC cut capacitor C5 has a large capacitance, it does not significantly affect the series resonance. Q2
The capacitor C7 connected between the drain and source of
The load during switching of the second switching means Q2 is reduced.

<About the Reflector 13>

The reflecting mirror 13 is used to collect the light emitted from the high-pressure discharge lamp 11, and as shown in FIG.
A base 13a, a reflective surface 13b, and a top opening 12c are provided.

The base 13a is formed by glass molding, and has an inner surface in the shape of a paraboloid of revolution.

The reflecting surface 13b is formed on the paraboloid of revolution of the substrate 13a by aluminum evaporation.

The top opening 13c has a stepped portion 12c
1 is formed and is fixed to a case 14 to be described later using the step 13c1.

The connecting conductor 1 is provided on the inner side of the top 13c1.
6a and 16b are fixed via an insulator 17, and one external lead wire 6 of the high-pressure discharge lamp 11 is connected to the connection conductor 16a.
And the other external lead wire 6 is connected to the connection conductor 16b, so that the high-pressure discharge lamp 11
Are mounted so that the axis is positioned along the optical axis.

The connection conductors 16a and 16b are connected between the high-frequency output terminals of the lighting circuit means 12.

<About Case 14>

As shown in FIG. 2, the case 14 is formed by molding a heat-resistant synthetic resin into a hollow grenade shape. The case 14 includes an upper body 14a and a lower body 1
The lighting circuit means 12 is housed therein. The upper body 14a supports a power receiving body 15, which will be described later.
1 are integrally protruded. The lower body 14b supports the high-pressure discharge lamp 11 and the reflecting mirror 13, and has an opening 14b1 at the lower end for this purpose. Then, the stepped portion 13c1 formed on the top portion 13c of the reflecting mirror 13 is inserted into the opening 14b1 and adhered to the reflecting mirror 1 to thereby form the reflecting mirror 1
3 is fixed to the case 14.

<Regarding Power Receiving Means 15>
Consists of an E26 screw cap, and the upper body 1 of the case 14
4a is attached to the cylindrical portion 14a1. The power receiving body 15 has a pair of power receiving terminals connected to an input terminal of the lighting circuit means 12.

[0085]

[Example] [High pressure discharge lamp 11]

Translucent ceramics discharge vessel 1: Material--made of translucent alumina ceramics, total length -23 mm

Enclosure 1a—outer diameter a is 5 mm, inner diameter 4 m
m, sphericity is 0.8, and axial length b (see FIG. 1) is 7.0 mm

Small-diameter cylindrical portion 1b-outer diameter 1.7 mm, inner diameter 0.
7mm (wall thickness 0.5mm), length 9mm

Electrode 2: Material—main component tungsten, diameter 0.25 mm, length 7.5 mm, distance between electrodes 3 mm

Slight gap g: 0.225 mm

Power supply conductor 3: Material-Niobium, diameter 0.6 m
m, length 4 mm, insertion depth 3 mm into small-diameter cylindrical part 1 b

External lead wire: material—Fe—Ni—Co alloy, diameter 0.64 mm, length 5.5 mm

First seal 4: Material-Al2O3-Si
O2-Dy2O3-based ceramic sealing compound, ie, chifrit glass, melting point 1500 ° C

Ceramic washer: Material-alumina ceramic

Second seal 7: Material—CaO—BaO—
SiO based bonding glass, frit glass, melting point 1045 ° C

Discharge medium: Starting gas and buffer gas-150% torr with a mixed gas of Ne3% + Ar97% by partial pressure.

Buffer vapor-2 mg of mercury

Compound of luminescent metal-Na: Tl: Dy: I
n: 2 m at 0.42: 1: 1.25: 1
g

Lamp power: 20 W

The inner diameter a of the sphere is determined by the lighting frequency f (kHz).
In this case, the frequency is, for example, 20 KHz so that a / f is within 0.37.

[Lighting circuit means 12]

Circuit configuration: A half-bridge type high-frequency inverter in which a pair of switching means are complementarily connected together with an LC resonance type is mainly used.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the high-pressure discharge lamp device of the present invention.

In the figure, the same parts as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, a glove 1 is used in place of the reflecting mirror.
8 is mainly different.

That is, the glove 18 is made of a transparent member and has a substantially hemispherical shape.
c is engaged with a peripheral groove 14c1 formed in the peripheral edge of c and is fixed by a heat-resistant adhesive.

A heat reflector 19 and an air insulation layer 20 are provided between the lid 14c and the high-pressure discharge lamp 11.

The air heat insulating layer 20 is formed between the lid 14c and the heat reflector 19 by forming a recess 14c2 in the lid 14c in contact with the back surface of the heat reflector 19.

Further, a pair of insertion holes 1 is formed in the lid 14c.
4c3 and 14c3 are formed. On the other hand, the high pressure discharge lamp 11 is supported by being placed horizontally and connected to the ends of the connection conductors 16c and 16d. The connection conductors 16c and 16d are inserted into the insertion holes 14c3 of the lid 14c, and the base ends are connected to the defeat base 12a.
It is connected to the high frequency output terminal of the lighting circuit means 12.

FIG. 6 is a front view showing a high-pressure discharge lamp according to a third embodiment of the high-pressure discharge lamp device of the present invention.

FIG. 7 is a longitudinal sectional view showing the same high-pressure discharge lamp.

In the figure, the same parts as those in FIG. 3 are denoted by the same reference numerals, and description thereof will be omitted.

This embodiment is different in that the high-pressure discharge lamp 11 is housed in the outer tube 8.

That is, the outer tube 8 is formed of a T-shaped valve, and has a pinch seal portion 8a at the open end. The high-pressure discharge lamp 11 is fixed in the outer tube 8 by holding the connection conductors 9a and 9b made of a molybdenum wire between the pinch seal portions 8a.

Further, an inert gas such as nitrogen is sealed in the outer tube 8 at a low pressure.

Further, by protruding the ends of the connection conductors 9a and 9b from the pinch seal portion 8a of the outer tube 8, they can be used as external connection terminals 9a1 and 9b1.

The pinch seal portion 8a is a standardized E11
The base B may be attached. In this case, if the exposed width of the pinch seal portion is 2.5 mm or less from the end of the base B, the lighting fixture can use a small reflecting mirror. . The same applies when the distance between the electrodes is 4 mm or less and the distance from the tip of the power receiving portion of the base to the light emission center is 50 mm or less. The same applies when the distance between the electrodes is 4 mm or less and the distance from the lamp side end of the base to the light emission center is 45 mm or less. On the other hand, if the distance between the electrodes corresponding to the maximum outer diameter of the base is set to 0.5 or less, displacement of the lamp is less likely to occur when the lamp is mounted on the lighting fixture. On the other hand, the high pressure discharge lamp 11
Since the power supply conductor 3 is not exposed to the atmosphere, the base end of the power supply conductor 3 is extended to protrude from the small-diameter cylindrical portion 1b.

A predetermined distance gE between the electrodes 2 and 2 is set.

FIG. 8 is a front view showing a main part of a high-pressure discharge lamp assembly according to a fourth embodiment of the high-pressure discharge lamp device of the present invention.

In the figure, the same parts as those in FIG. 6 are denoted by the same reference numerals, and the description is omitted. Reference numeral 10 denotes a starting auxiliary conductor.

The present embodiment is characterized in that the starting auxiliary conductor 10 is provided on the high-pressure discharge lamp 11.

The starting auxiliary conductor 6 is also made of a molybdenum wire, the base end of which is connected to the connecting conductor 9a by welding, and the front end of which is an intermediate portion of the small-diameter cylindrical portion 1b surrounding the lower electrode (not shown). It is wound around. Then, the tip may be bent so as to be more distant from the airtight container than the wound part so as not to discharge more than other parts.

In this embodiment, since the high-frequency output voltage of the lighting circuit means is applied between the lower electrode in the figure and the starting auxiliary conductor 10 at the time of starting, the electric field intensity between them is reduced. And the dielectric breakdown of the discharge medium is promoted. As a result, the high-pressure discharge lamp starts even at a relatively low voltage.

The high-pressure discharge lamp 11 of this embodiment
Is housed in an outer tube 8 as shown in FIG.

FIG. 9 is a front view showing a high-pressure discharge lamp device according to a fifth embodiment of the present invention. FIG. 10 is a longitudinal sectional view of the same. FIG. 11 is an enlarged front view of the high-pressure discharge lamp. FIG. 12 is an enlarged cross-sectional view of the main part.

In each figure, the same parts as those in FIGS. 2 and 3 are denoted by the same reference numerals, and description thereof is omitted.

In this embodiment, the high-pressure discharge lamp 11 is placed laterally with respect to the reflecting mirror 13, that is, the axis of the translucent ceramics discharge vessel 1 is orthogonal to the optical axis of the reflecting mirror 13, and 13 is provided with a protection means 21 surrounding the periphery of 13, and a front protection plate 22 is provided on the front surface of the reflecting mirror 13.

FIG. 11 and FIG.
As shown in FIG. 2, the connection conductors 16c and 16d are led out in a direction orthogonal to the axis of the high-pressure discharge lamp 11. Therefore, a radial slit 5b communicating with the through hole 5a along the central axis is formed in the ceramic washer 5, and the external connection conductors 16c and 16d are inserted therethrough.

The protection means 21 is provided on the cover 14 c of the case 14.
Are formed integrally.

The reflecting mirror 13 has an annular supporting portion 13d on the back.
And a pair of insertion holes 13e are formed in the reflection surface 13b.

The insertion holes 13 e are formed on both sides of the reflecting mirror 13 at the focal position of the reflecting mirror 13, centering on a straight line perpendicular to the optical axis of the reflecting mirror 13. This is for inserting the small-diameter cylindrical portion 1b of the discharge vessel 1 therethrough.

The high-pressure discharge lamp 11 is disposed on the reflecting mirror 13 such that the focal point is located between the electrodes 2 and 2. In this state, the small-diameter cylindrical portions 1b at both ends of the high-pressure discharge lamp 11 are inserted through the insertion holes 13e, and are exposed on the back side outside the reflecting mirror 13. The support portion 13d is integrally formed in a ring shape on the back surface of the base 13a, and is used when supporting the reflecting mirror 13. The lid 14c of the case 14 is made of a heat-resistant material such as a heat-resistant synthetic resin, and has a disk shape.
A support groove 14c4 for receiving d is formed. The support portion 1 of the reflecting mirror 13 fitted in the support groove 14c4
3d is fixed by the inorganic adhesive B.

The protection means 21 is made of a heat-resistant substance, and is formed in a tubular shape so as to stand integrally from the outer periphery of the lid 14c. The protection means 21 protects the reflecting mirror 13 and the exposed portion of the high-pressure discharge lamp 11 exposed from the reflecting mirror 13 to the outside. The external connection conductors 16c and 16d connected to the high-pressure discharge lamp 11 are connected to the conductor insertion holes 1 of the lid 14c.
4c3, and is led out to the back side of the lid 14c.

The front protection plate 22 is made of a light-transmitting heat-resistant member, and is adhered to the light-emitting opening of the reflecting mirror 13 with a heat-resistant adhesive to close the light-emitting opening.

FIG. 13 is a front view showing a spotlight as one embodiment of the lighting device of the present invention. In the figure, the same parts as those in FIG. 9 are denoted by the same reference numerals, and description thereof will be omitted. 31 is a lighting fixture main body, 32 is a high pressure discharge lamp device. The lighting fixture body 31 includes a base 31a, a support 31.
b and a lamp 31c. The base 31a is configured to be directly attached to the ceiling or hung from the ceiling via a lighting duct. The support 31b is a base 31
The lamp body 31c is hung down from a. Inside, an insulated conductor (not shown) connected to the base 31a is inserted. The lamp body 31c houses a lamp socket (not shown) inside. The lamp socket is connected to the insulated conductor.

The high-pressure discharge lamp device 32 is the same as that shown in FIG. 11, and is detachably mounted on a lamp socket.

When the base of the high-pressure discharge lamp device 32 is attached to the lamp socket of the lamp body 31c, the high-pressure discharge lamp device 32 is lit with high brightness and is condensed by the reflecting mirror 13. An illuminated body can be illuminated favorably by obtaining a sharp light distribution characteristic.

[0138]

According to the first or third or fourth aspect of the present invention, the sphericity is 0.6 to 1.0 and the maximum inner diameter is 2.0 to 2.0.
A high-pressure discharge lamp having a translucent ceramic discharge vessel having a substantially spherical shape of 5.5 mm and having an enclosure surrounding the discharge space and having a lamp power of 50 W or less and a high-pressure discharge lamp operating at a frequency f (kHz); Since there is provided lighting circuit means for lighting at a high frequency where a / f is within 0.4 when the inner diameter is a (mm), the resonance frequency can be made almost single mode and can be increased. As a result, the operating frequency of the lighting circuit means can be increased, so that a compact high-pressure discharge lamp device can be provided.

According to the second aspect of the present invention, in addition, a discharge medium containing dysprosium and a halogen atom, a high-pressure discharge lamp having a lamp power of 15 to 20 W and an a / f of 0.
Since it is 37 or less, it is possible to provide a high-pressure discharge lamp device that is further downsized.

According to the third aspect of the present invention, since the lighting circuit means is mainly composed of a high frequency inverter of the LC resonance type, a high-pressure discharge lamp device with a simple, compact and inexpensive circuit configuration can be provided. Can be provided.

According to the invention of claim 4, it is possible to provide a lighting device having the effect of claim 3.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram for explaining the sphericity of an enclosing portion of a translucent ceramic discharge vessel in a high-pressure discharge lamp device of the present invention.

FIG. 2 is a central sectional front view showing a first embodiment of the high-pressure discharge lamp device of the present invention.

FIG. 3 is a longitudinal sectional view of the high-pressure discharge lamp showing a state where only the upper side is assembled and sealed.

FIG. 4 is a circuit diagram showing lighting circuit means.

FIG. 5 is a longitudinal sectional view showing a second embodiment of the high-pressure discharge lamp device of the present invention.

FIG. 6 is a front view showing a high-pressure discharge lamp according to a third embodiment of the high-pressure discharge lamp device of the present invention.

FIG. 7 is a longitudinal sectional view showing the same high-pressure discharge lamp.

FIG. 8 is a front view showing a main part of a high-pressure discharge lamp assembly according to a fourth embodiment of the high-pressure discharge lamp lighting device of the present invention.

FIG. 9 is a front view showing a fifth embodiment of the high pressure discharge lamp lighting device of the present invention.

FIG. 10 is a longitudinal sectional view of the same.

FIG. 11 is an enlarged front view showing the same high-pressure discharge lamp.

FIG. 12 is an enlarged cross-sectional view of the main part

FIG. 13 is a front view showing a spotlight as an embodiment of the lighting device of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Translucent ceramic discharge vessel 1a ... Enclosure 1b ... Small diameter cylindrical part 5 ... Ceramic washer 11 ... High pressure discharge lamp 12 ... Lighting circuit means 12a ... Wiring board 13 ... Reflection mirror 13a ... Base 13b ... Reflection surface

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01J 61/88 H05B 41/24 L // H05B 41/24 F21Y 101: 00 F21Y 101: 00 F21S 5/00 A (72) Inventor Sadaguchi Sadaguchi 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation (72) Inventor Tatsuo Odabe 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo Toshiba Lighting & Technology Corporation F Terms (reference) 3K014 AA01 DA05 EA00 3K072 AA11 AC11 BA03 BB01 BC01 BC03 CA00 GA02 GB12 5C039 BB05 BB17 5C043 AA12 CD02 DD03 EA01 EC11

Claims (4)

[Claims] 1. A substantially spherical shape having a sphericity of 0.6 to 1.0, and a maximum inner diameter a surrounding a discharge space is 2.0 to 5.5.
a transparent ceramic discharge vessel having an enclosing portion of 1 mm, a pair of electrodes existing in the enclosing portion of the translucent ceramic discharge container, and a discharge medium sealed in the translucent ceramic discharge container. A high-pressure discharge lamp of 50 W or less; an operating frequency f (kHz);
Lighting circuit means for lighting at a high frequency where a / f is within 0.4 when the inner diameter is a (mm). 2. A substantially spherical shape having a sphericity of 0.6 to 1.0, and a maximum inner diameter a surrounding a discharge space is 2.0 to 5.5.
Including a translucent ceramics discharge vessel with an enclosing part of mm, a pair of electrodes existing in the enclosing part of the translucent ceramics discharge vessel, and dysprosium and halogen atoms sealed in the translucent ceramics discharge vessel A high-pressure discharge lamp having a discharge medium and a lamp power of 15 to 25 W; an operating frequency f (kHz), an inner diameter a
Lighting circuit means for lighting at a high frequency such that a / f is within 0.37 when (mm). 3. The high-pressure discharge lamp device according to claim 1, wherein the lighting circuit means is mainly composed of an LC resonance type high-frequency inverter. 4. A lighting device comprising: a lighting device main body; and the high-pressure discharge lamp device according to claim 3 supported by the lighting device main body.