JP3201090B2 - Lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention
The present invention relates to a lighting device using a light source that supplies power from the electrodes.

[0002]

2. Description of the Related Art A conventional lighting device will be described below.

[0003] In general, in a conventional lighting device in which a discharge lamp whose electrodes are opposed to each other is used as a light source and a reflector is used, as in a lighting device using an incandescent lamp or a halogen lamp as a light source, FIGS. It was such a configuration. FIG. 7 is a cross-sectional view of a conventional illumination device, and FIG. 8 is a plan view of the conventional illumination device as viewed from an irradiation direction side. The light source 41 is fixed to the reflecting mirror 42 itself with an adhesive 43 or the like, or is fixed to a jig, and the reflecting mirror 42 surrounds a part of the light source 41.

[0004]

Then, a discharge lamp, for example, a metal halide lamp, whose electrodes are arranged opposite to each other, is used as a light source 41.
When the light source 41 is turned on by the lighting circuit 44, the temperature inside the arc tube of the light source 41 is low (the coldest part), and the temperature is high in the upper portion. Most of the luminescent substance such as a metal compound sealed inside adhered to the lower wall surface inside the arc tube having a low temperature. As a result, when the light source 41 is turned on next time,
Since the temperature rise of the tube wall below the arc tube is delayed, the evaporation of the luminescent material attached to the inner surface of the arc tube is delayed, and therefore,
The rise time of the light from the light source 41 was long, and the required light output and spectral distribution could not be obtained immediately after lighting.

The present invention solves the above-mentioned conventional problems. The time required for evaporating the adhered substance inside the arc tube of the light source 41 immediately after lighting and obtaining a required light output and a spectral distribution on the surface to be irradiated is obtained. It is an object of the present invention to provide a lighting device in which the lighting time is significantly reduced.

[0006]

[0007]

[MEANS FOR SOLVING THE PROBLEMS] To achieve this object
In the lighting device of the present invention, a light source having electrodes disposed opposite to each other and supplying power from both electrodes, a reflecting mirror that partially surrounds the light source and reflects irradiation light from the light source, and partially includes the light source An illuminator comprising cooling means for cooling, configured to cool the vicinity of an upper part of the arc tube of the light source after the light source is turned off
An apparatus, wherein the cooling means is by blowing air,
And from at least a part of the power supply member of the light source.
It is made to wind .

[0008]

[0009]

[0010]

[Action] unlit later by cooling the upper portion of the arc tube of the light source, the light emitting tube top becomes the coldest spot, arc tube encapsulating material that has evaporated during the lighting is deposited on top inside wall of the arc tube. Therefore, the next time the lamp is turned on, the heat generated together with the light emission causes the temperature of the inner wall of the upper part of the arc tube to rise quickly, and the luminous substance, such as a metal compound enclosed inside the arc tube, adhered to the inner wall surface of the arc tube. Rapid evaporation can significantly reduce the time required to obtain the required light output and spectral distribution.

[0011]

【Example】

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described.

FIGS. 1 and 2 show the configuration of the illumination device of the present embodiment. As shown in FIG. 1, the lighting device includes a light source 1, a parabolic reflecting mirror 2 for reflecting irradiation light from the light source 1, a lighting circuit 3, and a rotating device 4. A discharge lamp, for example, a short-arc type metal halide lamp is used as the light source 1. The electrodes 5 a and 5 b are arranged inside the light source 1 and electric power is supplied from the electrodes 5 a and 5 b to discharge between them. Light is generated by the generation.
In this embodiment, the axis formed by the electrodes 5a and 5b of the light source 1 and the center of the optical axis of the parabolic reflector 2 arranged so as to surround a part of the light source 1 are both horizontal, and They are arranged on the same axis, and this axis is a rotation axis XX ′.

Next, the operation of the illuminating device configured as described above will be described. The light source 1 is rotated around a rotation axis XX 'by a rotation device 4 including a motor 6, a drive belt 7, and a pulley 8. In this embodiment, before the light source 1 is turned on, the light source 1 is turned in approximately one direction (for example, rightward) by approximately 180 °, and then the light source 1 is turned on. Light source 1
Is turned off, the next time the light source 1 is turned on, the light source 1 is turned approximately 180 degrees in the opposite direction (left direction) and then turned on. As described above, when the light source 1 is repeatedly turned off and turned on, the operation of inverting the vertical direction of the light emitting tube of the light source 1 before turning on the light source 1 and rotating the light emitting tubes in the opposite directions is repeated. Like that. Due to this operation, the light source 1 adheres to the inner wall of the arc tube.
A luminescent substance such as a metal compound encapsulated in the arc tube is moved to the upper inner surface of the arc tube, and the heat generated together with the light emission of the light source 1 raises the temperature of the inner wall of the arc tube quickly, and the adhered substance on the inner wall of the arc tube Can be quickly evaporated.

Therefore, the time from immediately after lighting to obtaining the required light output and spectral distribution can be significantly reduced, and the heat load applied to the arc tube of the light source 1 can be dispersed. Problems such as deterioration and devitrification can be significantly reduced, and the degree of luminous flux reduction of the light source 1 can be improved, that is, the life of the light source 1 can be extended.

By reversing the rotation direction of the light source 1, the power supply method to the light source 1 can be controlled by the leads 9a, 9b.
By a simple method.

In this embodiment, the configuration in which only the light source 1 is rotated has been described.
It is needless to say that the same effect can be obtained even in a configuration in which the light source 1 and the parabolic reflecting mirror 2 rotate integrally with the light source 1 fixed in the state.

Further, in this embodiment, the parabolic reflector 2 is used. However, it goes without saying that other devices such as an elliptical reflector and a spherical reflector have the same effect.

Although the light source 1 is inverted in this embodiment, it goes without saying that the same effect can be obtained even if the light source 1 is rotated only in one direction.

(Embodiment 2) Hereinafter, a second embodiment of the present invention will be described. As shown in FIGS. 3 and 4, the lighting device of the present embodiment includes a light source 10, a parabolic reflector 11, a lighting circuit 12, and a rotating device 13. In the second embodiment, the center of the optical axis of the parabolic reflector 11 arranged so as to surround a part of the light source 10 is horizontal, and the axis formed by the electrodes 14a and 14b of the light source 10 is parabolic reflection. The rotation axis XX ′ is orthogonal to the optical axis center of the mirror 11 and the optical axis center of the parabolic reflection mirror 11. The light source 10 is a parabolic reflector 11
Are fixed by an adhesive 17 and are integrated.

Next, the operation of the illuminating device configured as described above will be described. The light source 10 is rotated about a rotation axis XX ′ by a rotation device 13 including a motor 6, a drive belt 7, and a pulley 15. In the present embodiment, before the light source 10 is turned on, as in the first embodiment, the light source 1 is turned on.
The light-emitting substance such as a metal compound sealed in the arc tube attached to the lower surface of the arc tube inner wall, which is the coldest part of 0, is moved to the upper inner surface of the arc tube, and the heat generated together with the light emission of the light source 10 causes the light to quickly move inside the arc tube. Before the light source 10 is turned on, it is rotated in one direction (for example, rightward) before the light source 10 is turned on in order to evaporate the adhered substance and to prevent the lead wires 16a and 16b from being twisted and broken by the rotation. Move
After the light source 10 is turned off, when the light source 10 is turned on next,
Rotate 180 ° in the opposite direction (left direction) and repeat.

Therefore, the time required for obtaining the required light output and spectral distribution immediately after the lighting of the light source 10 can be significantly reduced, and the heat load applied to the arc tube of the light source 10 can be dispersed. Problems such as deterioration and devitrification of the arc tube material can be significantly reduced, and the degree of luminous flux reduction of the light source 10 can be improved, that is, the life of the light source 10 can be extended.

Further, by reversing the rotation direction of the light source 10, the power supply method to the light source 1 can be controlled by the lead wires 9a, 9a.
b.

Further, when the light source 10 is turned on vertically without rotating, the lower electrode 14b deteriorates faster than the upper electrode 14a because strong light is emitted near the lower electrode 14b. By rotating as described above, the life of the upper and lower electrodes 14a and 14b can be extended, that is, the life of the light source 10 can be extended.

In the first and second embodiments of the present invention, the light source is inverted. However, it is needless to say that the same effect can be obtained by only rotating in one direction.

In this embodiment, the light source 10 and the parabolic reflector 11 are integrally rotated. However, the light source 10 is not fixed to the parabolic reflector 11 and only the light source 10 is rotated. It is needless to say that the same effect can be obtained even in a configuration in which is rotated.

Further, in this embodiment, the parabolic reflector 11 is used. However, it goes without saying that other devices such as an ellipsoidal reflector and a spherical reflector have the same effect.

(Embodiment 3) Next, a third embodiment of the present invention will be described. As shown in FIG. 5, a power supply pulley 18 is used instead of a lead wire to supply power from a lighting circuit (not shown) to a light source (not shown). The third embodiment of the present invention has the same configuration as that of the first and second embodiments of the present invention except for the power supply pulley 18.

As shown in FIG. 5, the power supply pulley 18
Are power supply lines 19a and 19 from a lighting circuit (not shown).
b, composed of conductive members 20a and 20b, one of the power supply line 19a and the power supply line 19b is connected to the lighting circuit, and the other is connected to the conductive member 20a and the conductive member 20b. . Further, the conductive members 20a and 20b are connected to the light source 1 or the light source 10.

In the power supply pulley 18, the conductive member 20a and the conductive member 20b and the insulating member 2
The insulating members 1a and the insulating members 21b are alternately arranged concentrically around the rotation axis XX '.

In the above configuration, the power supply pulley 1
8, the conductive member 20a is in contact with the power supply line 19a, and the conductive member 20b is in contact with the power supply line 19b. Therefore, even if the power supply pulley 18 rotates, power is supplied to the light source (not shown). Can be supplied. Therefore, as in the first and second embodiments of the present invention, the lead wire 1
6a and the lead wire 16b are connected to the pulley 8 and the pulley 15
Since it is not twisted at the time of turning, there is no need to turn it around, and the turning direction and the turning angle can be set arbitrarily, and the configuration of the lighting device can be simplified.

In the first to third embodiments of the present invention, the rotating device is constituted by a motor, a drive belt, and a pulley. However, the light source or the light source is fixed by magnetic force or direct drive of the motor. It is needless to say that the same effect as in the above embodiment can be obtained if the configuration is such that the reflecting mirror can be rotated, and if the configuration is such that the lead wires 16a and 16b are in contact with the conductive members 20a and 20b. Needless to say, it has the same effect.

(Embodiment 4) Next, a fourth embodiment of the present invention will be described. As shown in FIG. 6, the lighting device of the present embodiment includes a light source 22, a parabolic reflector 23, a lighting circuit 24,
And a blower fan 25 as cooling means. As the light source 22, a discharge lamp, for example, a short arc type metal halide lamp is used. An electrode 26a and an electrode 26b are arranged in the light source 22, and light is generated by generating a discharge between the electrodes. In this embodiment, a power supply member 27 for supplying power to the electrode 26a of the light source 22 is provided.
Are partially hollow, and a cooling air 28 from a blower fan 25 is supplied to a power supply member 27 via a lamp jig 29.
, And is emitted from an outlet 31 provided above the light source 22.

Next, the operation of the illuminating device configured as described above will be described. In this embodiment, the cooling air 28 is not emitted from the outlet 31 while the light source 22 is turned on, and the cooling air 28 is emitted from the outlet 31 for a certain time immediately after the light source 22 is turned off. For this reason, the vicinity of the upper part of the light emitting tube of the light source 22 is rapidly cooled and becomes the coolest part, so that the light source 2
The luminescent substance such as a metal compound sealed in the arc tube which has been evaporated during the lighting of No. 2 adheres to the upper inner wall of the arc tube after the light is turned off. Therefore, when the light source 22 is turned on next time, the temperature of the upper inner wall of the arc tube is quickly raised by the heat generated together with the light emission of the light source 22, and the adhered substance on the inner wall of the arc tube can be quickly evaporated.

For this reason, without turning the light source 22, the time from immediately after lighting to obtaining the required light output and spectral distribution can be significantly reduced, and the air is blown through the cavity 30 of the power supply member 27. Therefore, the area that blocks the irradiation light from the light source can be minimized.

In this embodiment, the cooling air 28 from the blower fan 25 serving as the cooling means passes through the cavity 30 of the power supply member 27 via the lamp jig 29 and
2, but the cooling air 28 is not emitted from the power supply member 27,
It is needless to say that the above effect can be obtained by cooling the vicinity of the upper part of the light emitting tube after the light source 22 is turned off by a blower tube or the like, and the blower can be blown without using the blower fan 25 as a cooling means. Needless to say, a similar effect can be obtained.

Further, in this embodiment, the parabolic reflecting mirror 23 is used, but it goes without saying that other effects such as an elliptical reflecting mirror and a spherical reflecting mirror have the same effect.

In addition, cooling air 28
Is released from the outlet 31 through the lamp jig 29 and the cavity 30 of the power supply member 27. Conversely, heat around the upper part of the light source 22 is sucked from the outlet 31 and the blower fan 25 Needless to say, the same effect can be obtained even if the air is exhausted from the air.

In general, it is not possible to relight the light source immediately after the light source is turned off. However, with the structure of this embodiment, the temperature of the entire light emitting tube of the light source 22 is rapidly reduced, and the time until the light source is relighted is extremely long. Be shortened.

Further, in the present embodiment, the cooling air 28 is not emitted while the light source 22 is turned on. However, the explosion-proof of the arc tube when the light source 22 being turned on is abnormally heated, the temporal change of the light source 22, and the like. Correction of light output and spectral characteristics by light source 2
The cooling air 28 may be emitted while the light source 22 is turned on, for example, to reduce the deterioration of the arc tube 2.

[0040]

[0041]

[0042]

[0043]

[0044]

As described above, according to the present invention, since the cooling air is emitted to the upper part of the light emitting tube of the light source, the temperature of the inner wall of the upper part of the light emitting tube is quickly raised by the heat generated together with the light emission without rotating the light source. As a result, the attached substances on the inner wall of the arc tube can be quickly evaporated. As a result, it is possible to remarkably shorten the time from immediately after lighting to obtaining a required light output and spectral distribution, and it is possible to minimize the area that blocks irradiation light from the light source.

Further, since the temperature of the entire light emitting tube of the light source is accelerated, the time until re-lighting is remarkably shortened. Further, by discharging cooling air while the light source is turned on, explosion-proof of the light emitting tube and the light source of the light source are prevented. It is possible to correct the light output / spectral characteristics and reduce the deterioration of the arc tube.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a lighting device according to a first embodiment of the present invention.

FIG. 2 is a plan view of the lighting device viewed from an irradiation direction side.

FIG. 3 is a sectional view of a lighting device according to a second embodiment of the present invention.

FIG. 4 is a plan view of the lighting device as viewed from an irradiation direction side.

FIG. 5 is a perspective view of a lighting device according to a third embodiment of the present invention.

FIG. 6 is a cross-sectional view of a lighting device according to a fourth embodiment of the present invention.

FIG. 7 is a cross-sectional view of a conventional lighting device.

FIG. 8 is a plan view of a conventional illumination device viewed from an irradiation direction side.

[Explanation of symbols]

1,10,22 Light source 2,11,23 Parabolic reflector 3,12,24 Lighting circuit 4,13,17 Rotating device 5a, 5b, 14a, 14b, 26a, 26b Electrode 6 Motor 7 Drive belt 8, 15 Pulley 9a, 9b, 16a, 16b, 32a, 32b Lead wire 17 Adhesive 18 Power supply pulley 19a, 19b Power supply line 20a, 20b Conductive member 21a, 21b Insulating member 25 Blower fan 27 Power supply member 28 Cooling air 29 lamp jig 30 cavity 31 outlet

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 61/54 H01J 61/52 H01J 61/88 B60Q 1/04 B60Q 1/05

Claims (1)

(57) [Claims] 1. A light source having electrodes disposed opposite to each other and supplying power from both electrodes, a reflecting mirror partially surrounding the light source and reflecting light emitted from the light source, and cooling for partially cooling the light source. comprising means, to configure the lighting device so as to cool the arc tube near the top of the light source after turning off of the light source
The cooling means is by blowing air, and the light source
The air is blown from at least a part of the power supply member .