JP2009231282A - High-pressure discharge lamp lighter and lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-pressure discharge lamp lighter 18 in which a data volume for computational processing can be limited and a complicated computational processing can be dispensed with and a color temperature of the high-pressure discharge lamp can be adjusted easily. <P>SOLUTION: An emission spectrum of a high-pressure discharge lamp 17 to be lit by a high-pressure discharge lamp lighting means 34 is detected by an emission spectrum detecting means 20. An emission intensity ratio of two specific wavelengths of thallium (Tl) and sodium (Na) which are halide principal composition enclosed in the high-pressure discharge lamp 17 is computed by a controlling circuit 36 from the emission spectrum detected by the emission spectrum detecting means 20. A duty ratio of a rectangular wave current output by the high-pressure discharge lamp lighting means 34 in accordance with the computed emission intensity ratio is controlled by the controlling circuit 36. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a high pressure discharge lamp lighting device for lighting a high pressure discharge lamp, and an illumination device using the high pressure discharge lamp lighting device.

  Conventionally, for example, in a high pressure discharge lamp such as a metal halide lamp, even when the same type is used, the color temperature at the time of lighting is 50 to 50 due to variations in encapsulated chemical amount, manufacturing variations such as arc tube dimensions, electrode positions, and electrode intervals. There is a variation of about 100K. Therefore, when a plurality of high-pressure discharge lamps of the same type are turned on at the same time in a store or the like, the color temperature may appear to be different for each high-pressure discharge lamp.

  In addition, to correct the color temperature of the high-pressure discharge lamp, the color temperature of the high-pressure discharge lamp during lighting is measured, and the lighting frequency output to the high-pressure discharge lamp is changed or the high-pressure discharge lamp is changed according to the measured value. There is a high-pressure discharge lamp lighting device that changes the color temperature of a high-pressure discharge lamp by changing the duty ratio of a rectangular wave current to be output (see, for example, Patent Documents 1 and 2).

JP 2003-168588 A (page 4-5, FIG. 5-6) Japanese Patent No. 3584835 (page 4, Fig. 1-4)

  However, in order to measure and process the color temperature of a high-pressure discharge lamp as in a conventional high-pressure discharge lamp lighting device, for example, when using detection means such as a color luminance meter or a spectroradiometer, The tristimulus value is obtained from the measurement value by the detection means, the chromaticity value is calculated and the color temperature is calculated from the chromaticity value, and the amount of data to be processed is very large and complicated. Requires a lot of arithmetic processing.

  Therefore, in the conventional high-pressure discharge lamp lighting device, in order to change the color temperature of the high-pressure discharge lamp, it is necessary to cope with complicated arithmetic processing using an arithmetic circuit with high processing capability. It was not easy to adjust.

  The present invention has been made in view of the above points, and requires only a small amount of data to be processed, does not require complicated calculation processing, and can easily adjust the color temperature of the high pressure discharge lamp. It is an object of the present invention to provide a lighting device and a lighting device using the high pressure discharge lamp lighting device.

  The high-pressure discharge lamp lighting device according to claim 1 is a high-pressure discharge lamp lighting means for lighting the high-pressure discharge lamp; an emission spectrum detection means for detecting an emission spectrum of the high-pressure discharge lamp that is turned on by the high-pressure discharge lamp lighting means; From the emission spectrum detected by the detection means, the emission intensity ratio of two specific wavelengths resulting from the main component of the halide sealed in the high-pressure discharge lamp is obtained, and the output of the high-pressure discharge lamp lighting means according to this emission intensity ratio. And a control means for controlling.

  The high-pressure discharge lamp includes, for example, a discharge lamp in which a plurality of halides are sealed as a luminescent material, such as a metal halald lamp, and includes a light-emitting tube, and a pair of electrodes is provided on the light-emitting tube by sealing. And a discharge medium is enclosed. As a discharge medium, start-up and buffer gas, metal halide, mercury and the like are enclosed. Examples of the halide include thallium (Tl) and sodium (Na) as main components, and Tm, Ca, In, Li, Rb and the like may be added as chromaticity adjusting components.

  The high-pressure discharge lamp lighting means includes, for example, a rectifier circuit that rectifies an AC power supply, a chopper circuit for power factor improvement of the input power supply, and an inverter circuit that includes a switching element that converts the pulse voltage into a rectangular wave and applies it to the high-pressure discharge lamp. Although it may be constituted by a starting circuit such as an igniter for assisting the starting of the high-pressure discharge lamp, it is not limited to such a configuration.

  The emission spectrum of the high-pressure discharge lamp detected by the emission spectrum detecting means includes the emission wavelength and the emission intensity. The emission spectrum detecting means may be a single sensor or may be combined with a filter that mainly transmits a specific wavelength.

  The two specific wavelengths are halides sealed in the high-pressure discharge lamp and are preferably wavelengths derived from the main component that has a large influence on the color temperature of the high-pressure discharge lamp, but may be wavelengths derived from the color adjustment component. For example, there are two specific wavelengths caused by thallium (Tl) and sodium (Na), but are not limited thereto.

  The control means, for example, has a relationship between the emission intensity ratio of two specific wavelengths and the color temperature of the high-pressure discharge lamp in advance, and based on this, the emission intensity ratio obtained from the detected two specific wavelengths is the high-pressure discharge. The output of the discharge lamp lighting means may be feedback-controlled so as to achieve a target emission intensity ratio corresponding to the lamp type and the color temperature of the specification. In the control means, for example, the switching element of the inverter circuit used for the high pressure discharge lamp lighting means is controlled to be turned on and off, the duty ratio for turning on the switching element is changed, or the lighting frequency is changed by the switching element. Change the color temperature. In short, the emission intensity ratio, that is, the color temperature is changed by changing one or two or more of the ratio of the positive / loss of the lighting current value, the lighting frequency, the lighting power, etc. according to the type and specification of the high-pressure discharge lamp. .

  The high-pressure discharge lamp lighting device according to claim 2 is the high-pressure discharge lamp lighting device according to claim 1, wherein the two specific wavelengths are wavelengths caused by thallium (Tl) and sodium (Na), which are halide main components. There is something.

  The main components of halide, thallium (Tl) and sodium (Na) have a large influence on the color temperature of the high-pressure discharge lamp, and it is preferable to detect at least these specific wavelengths. The wavelength of thallium (Tl) is 535 nm, and the wavelength of sodium (Na) is 589 nm (depending on the measurement conditions, it is in the range of 585 to 595 nm).

  The high-pressure discharge lamp lighting device according to claim 3 is the high-pressure discharge lamp lighting device according to claim 2, wherein the emission spectrum detection means has a peak sensitivity of the emission spectrum caused by thallium (Tl) and sodium (Na). At one particular wavelength.

  The emission spectrum detecting means may use a sensor whose emission spectrum peak sensitivity is at two specific wavelengths, or may be a combination of a sensor and a filter that mainly transmits two specific wavelengths. Also, two emission spectrum detecting means having peak sensitivity at each specific wavelength may be used.

  The high pressure discharge lamp lighting device according to claim 4 is the high pressure discharge lamp lighting device according to any one of claims 1 to 3, wherein the control means outputs a rectangular wave output by the high pressure discharge lamp lighting means in accordance with the emission intensity ratio. It controls the duty ratio of the current.

  For example, the control means controls on / off of the switching element of the inverter circuit used for the high pressure discharge lamp lighting means, and varies the duty ratio for turning on the switching element, so that the high pressure discharge lamp lighting means outputs according to the emission intensity ratio. The duty ratio of the rectangular wave current to be controlled is controlled.

  The lighting device according to claim 5 comprises: a fixture body provided with a high pressure discharge lamp; and the high pressure discharge lamp lighting device according to any one of claims 1 to 4 for lighting the high pressure discharge lamp. is there.

  The emission spectrum detection means may be arranged at a position where the emission spectrum of the high-pressure discharge lamp attached to the instrument body can be detected.

  According to the high pressure discharge lamp lighting device according to claim 1, the emission spectrum of the high pressure discharge lamp is detected, and two specific wavelengths originating from the halide main components sealed in the high pressure discharge lamp are detected from the detected emission spectrum. Since the emission intensity ratio is obtained and the output of the high pressure discharge lamp lighting means is controlled in accordance with the emission intensity ratio, the amount of data to be calculated by the control means can be reduced, and no complicated calculation processing is required. The color temperature can be easily adjusted.

  According to the high pressure discharge lamp lighting device according to claim 2, in addition to the effect of the high pressure discharge lamp lighting device according to claim 1, the two specific wavelengths are: thallium (Tl) which is a halide main component and sodium (Na). ), The color temperature characteristics of the high-pressure discharge lamp can be accurately detected, and the color temperature of the high-pressure discharge lamp can be accurately adjusted to a predetermined color temperature.

  According to the high pressure discharge lamp lighting device of the third aspect, in addition to the effect of the high pressure discharge lamp lighting device of the second aspect, the emission spectrum detecting means has a peak sensitivity of the emission spectrum of thallium (Tl) and sodium ( Therefore, the control means can identify and detect two specific wavelengths for which the light emission intensity ratio is obtained, and the arithmetic processing in the control means can be simplified.

  According to the high pressure discharge lamp lighting device of the fourth aspect, in addition to the effect of the high pressure discharge lamp lighting device according to any one of the first to third aspects, the high pressure discharge lamp lighting means outputs according to the emission intensity ratio. By controlling the duty ratio of the rectangular wave current, the color temperature of the high-pressure discharge lamp can be easily adjusted.

  According to the illuminating device of Claim 5, it can illuminate with the light of predetermined color temperature.

It is a block diagram of a high pressure discharge lamp lighting device showing an embodiment of the present invention. It is sectional drawing of the illuminating device to which a high pressure discharge lamp lighting device same as the above is applied. The waveform diagram of the rectangular wave current of the same high pressure discharge lamp lighting device is shown, (a) is a waveform diagram with a duty ratio of 50%, (b) is a waveform diagram with a duty ratio of 30%, and (c) is a duty ratio of 10%. It is a waveform diagram of%. It is a graph which shows the measurement result of the relationship between the wavelength of the light emission spectrum at the time of lighting a high pressure discharge lamp with each duty ratio with a high pressure discharge lamp lighting device same as the above, and light emission intensity. It is a graph which shows the measurement result of the relationship between a duty ratio same as the above, and the color temperature of a high pressure discharge lamp. It is a graph which shows the measurement result of the relationship between a duty ratio and light emission intensity ratio (535nm / 589nm) same as the above. It is a flowchart which shows adjustment operation of the color temperature of a high pressure discharge lamp by a high pressure discharge lamp lighting device same as the above.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a block diagram of a high pressure discharge lamp lighting device, FIG. 2 is a sectional view of a lighting device to which the high pressure discharge lamp lighting device is applied, FIG. 3 is a waveform diagram of a rectangular wave current of the high pressure discharge lamp lighting device, Is a waveform diagram with a duty ratio of 50%, (b) is a waveform diagram with a duty ratio of 30%, (c) is a waveform diagram with a duty ratio of 10%, and FIG. 4 is a high pressure at each duty ratio by a high pressure discharge lamp lighting device. FIG. 5 is a graph showing the measurement result of the relationship between the wavelength of the emission spectrum and the emission intensity when the discharge lamp is turned on, FIG. 5 is a graph showing the measurement result of the relationship between the duty ratio and the color temperature of the high-pressure discharge lamp, and FIG. FIG. 7 is a flowchart showing the adjustment operation of the color temperature of the high-pressure discharge lamp by the high-pressure discharge lamp lighting device. The graph shows the measurement result of the relationship between the duty ratio and the emission intensity ratio (535 nm / 589 nm).

  As shown in FIG. 2, the lighting device 11 includes an appliance body 13 installed on the ceiling 12. A partition wall 14 is provided in the instrument body 13, a socket 15 and a reflector 16 are disposed below the partition wall 14, and a high-pressure discharge lamp 17 is attached to the socket 15. A high pressure discharge lamp lighting device 18 for lighting the high pressure discharge lamp 17 is arranged above the partition wall 14.

  A detection hole 19 is formed in the reflector 16 so as to face the high-pressure discharge lamp 17, and an emission spectrum detecting means 20 for detecting the emission spectrum of the high-pressure discharge lamp 17 through the detection hole 19 is disposed outside the reflector 16. .

  The high-pressure discharge lamp 17 is, for example, a metal halide lamp, and includes an arc tube, an outer tube that accommodates the arc tube, a support member that supports the arc tube in the outer tube, a base provided on the outer tube, and the like. The arc tube includes a translucent ceramic discharge container, a pair of electrodes sealed in the translucent ceramic discharge container, a discharge medium sealed in the translucent ceramic discharge container, and the like. As the discharge medium, start-up and buffer gas, metal halide, mercury and the like are enclosed. Examples of the halide include thallium (Tl) and sodium (Na) as main components, and Tm, Ca, In, Li, Rb and the like are added as chromaticity adjusting components.

  In the high-pressure discharge lamp 17, the aspect ratio of the inside of the arc tube has a relationship of distance between electrodes / maximum inner diameter of the arc tube ≧ 2.

  As shown in FIG. 1, the high-pressure discharge lamp lighting device 18 is connected to a commercial AC power source e with a rectifier circuit 31 for full-wave rectification of the AC voltage of the commercial AC power source e. A variable output step-up / step-down chopper circuit 32 that also functions as a pair regulator for improvement is connected. A full-bridge type inverter circuit 33 that converts the pulse voltage into a rectangular wave and applies it to the high-pressure discharge lamp 17 is connected to the chopper circuit 32. It is connected. The chopper circuit 32 and the inverter circuit 33 constitute a high pressure discharge lamp lighting means 34. The inverter circuit 33 is connected to the high-pressure discharge lamp 17 via an igniter 35 that outputs a pulse at the start and assists the start.

  Further, the output of the chopper circuit 32 and the output of the inverter circuit 33 are controlled by a control circuit 36 as control means. The control circuit 36 is connected with the emission spectrum detecting means 20. The control circuit 36 can be housed in the same case as the high-pressure discharge lamp lighting device 18 in the lighting device 11 as shown in FIG.

  Then, the control circuit 36 obtains the emission intensity ratio of the two specific wavelengths caused by the halide main component enclosed in the high-pressure discharge lamp 17 from the emission spectrum detected by the emission spectrum detecting means 20, and this emission intensity. It has a function of controlling the output of the high pressure discharge lamp lighting means 34 in accordance with the ratio.

  The control of the output of the high pressure discharge lamp lighting means 34 by the control circuit 36 controls the duty ratio of the rectangular wave current output from the high pressure discharge lamp lighting means 34 as shown in FIG. The duty ratio of the positive rectangular wave current is controlled to 50%, 30%, 10%, for example. Note that the duty ratio shown here is an example, and is not limited to these examples, and can be continuously changed or finely changed stepwise.

  FIG. 4 shows the relationship between the emission spectrum wavelength and the emission intensity detected by the emission spectrum detecting means 20 when the high-pressure discharge lamp 17 is turned on at 50%, 30% and 10% duty ratios. In FIG. 4, a curve indicating an emission spectrum with a duty ratio of 50% is represented by a bold line, and portions of the curves indicating a duty ratio of 10% and 30% that do not overlap 50% are represented by broken lines. According to FIG. 4, 535 nm of thallium (Tl), which is a main component of halide enclosed in the high-pressure discharge lamp 17, and 589 nm of sodium (Na) (depending on the measurement conditions, the range may be 585 to 595 nm). In the description, the emission intensity is 589 nm, and the influence of these on the color temperature of the high-pressure discharge lamp 17 is great. Therefore, 535 nm of these thallium (Tl) and 589 nm of sodium (Na) are set as specific wavelengths, and the emission intensity ratios thereof are obtained.

  FIG. 5 shows a result obtained by measuring the relationship between the duty ratio and the color temperature of the high-pressure discharge lamp 17. It can be seen that the color temperature is lower as the duty ratio is larger and the color temperature is higher as the duty ratio is smaller.

  FIG. 6 shows the results obtained by measuring the relationship between the duty ratio and the emission intensity ratio (535 nm / 589 nm) of 535 nm of thallium (Tl) and 589 nm of sodium (Na). It can be seen that there is a relationship in which the emission intensity ratio (535 nm / 589 nm) decreases as the duty ratio increases, and the emission intensity ratio (535 nm / 589 nm) increases as the duty ratio decreases.

  From these, it can be seen that there is a correlation between the color temperature of the high-pressure discharge lamp 17 and the emission intensity ratio (535 nm / 589 nm) based on the duty ratio.

  The control circuit 36 includes storage means. In this storage means, the relationship between the duty ratio shown in FIG. 5 and the color temperature of the high-pressure discharge lamp 17, and the duty ratio and emission intensity ratio (535 nm / 589 nm) shown in FIG. The relationship between the duty ratio, the color temperature of the high-pressure discharge lamp 17 and the emission intensity ratio (535 nm / 589 nm) is stored.

  That is, the control circuit 36 determines the emission intensity determined from the two specific wavelengths detected based on the relationship between the duty ratio stored in advance, the color temperature of the high-pressure discharge lamp 17 and the emission intensity ratio (535 nm / 589 nm). The function of controlling the duty ratio of the rectangular wave current output from the high-pressure discharge lamp lighting means 34 so that the ratio becomes the target light emission intensity ratio corresponding to the type and color temperature of the high-pressure discharge lamp 17 ing.

  The emission spectrum detecting means 20 preferably has the peak sensitivity of the emission spectrum at two specific wavelengths caused by thallium (Tl) and sodium (Na). For example, the peak sensitivity of the emission spectrum has two specific wavelengths. The sensor may be used, or a sensor and a filter that mainly transmits two specific wavelengths may be used in combination. Further, two sensors having peak sensitivity at each specific wavelength, or a combination of a sensor and a filter may be used.

  Next, the operation of the high pressure discharge lamp lighting device 18 will be described.

  The AC voltage of the commercial AC power source e is rectified by the rectifier circuit 31, stepped up / down by the chopper circuit 32, converted into a rectangular wave AC voltage by the inverter circuit 33, and applied to the high-pressure discharge lamp 17. At startup, the igniter 35 applies a pulsed higher voltage than normal, and the high-pressure discharge lamp 17 is started and lit.

  In the control circuit 36, a target emission intensity ratio corresponding to the type of the high-pressure discharge lamp 17 and the color temperature of the specification is set in advance by setting means (not shown). For example, when the target color temperature is set to 3400K, the duty ratio is set to 40% from FIG. 5, and the emission intensity ratio (535 nm / 589 nm) is set to 0.9 from FIG.

  Then, the emission spectrum of the high-pressure discharge lamp 17 is detected by the emission spectrum detection means 20, and the emission intensity ratio (535nm / 589nm) a of two specific wavelengths caused by thallium (Tl) and sodium (Na) is detected by the control circuit 36. Ask for.

  As shown in FIG. 7, the control circuit 36 compares the detected light emission intensity ratio (535 nm / 589 nm) a with the target light emission intensity ratio 0.9. The color temperature of the discharge lamp 17 is the target color temperature.

  When the detected emission intensity ratio (535 nm / 589 nm) a is larger than the target emission intensity ratio 0.9 (a> 0.9), the color temperature of the high-pressure discharge lamp 17 that is lit is the target color temperature. Higher than. In this case, by controlling the duty ratio to be higher than the current value, the color temperature of the lit high pressure discharge lamp 17 is lowered, and the color temperature of the lit high pressure discharge lamp 17 is aimed. Adjust the color temperature.

  When the detected emission intensity ratio (535 nm / 589 nm) a is smaller than the target emission intensity ratio 0.9 (a <0.9), the color temperature of the high pressure discharge lamp 17 that is lit is the target color temperature. Is lower. In this case, by controlling the duty ratio to be lower than the current value, the color temperature of the lit high-pressure discharge lamp 17 is increased, and the color temperature of the lit high-pressure discharge lamp 17 is aimed. Adjust the color temperature.

  In this way, the emission spectrum of the high-pressure discharge lamp 17 is detected, the emission intensity ratio of two specific wavelengths is obtained from the detected emission spectrum, and the output of the high-pressure discharge lamp lighting means 34 is controlled according to this emission intensity ratio. Therefore, the amount of data to be processed by the control circuit 36 can be reduced, no complicated calculation processing is required, and the color temperature of the high-pressure discharge lamp 17 can be easily adjusted.

  Moreover, the color temperature characteristics of the high-pressure discharge lamp 17 can be selected by selecting specific wavelengths derived from thallium (Tl) and sodium (Na) as the main components of the halide enclosed in the high-pressure discharge lamp 17 as two specific wavelengths. Can be accurately detected, and the color temperature of the high-pressure discharge lamp 17 can be accurately adjusted to a predetermined color temperature.

  Further, since the emission spectrum detection means 20 has the peak sensitivity of the emission spectrum at two specific wavelengths caused by thallium (Tl) and sodium (Na), the control circuit 36 determines the emission intensity ratio to two specific wavelengths. It can be identified and detected, and the arithmetic processing in the control circuit 36 can be simplified.

  Further, the color temperature of the high-pressure discharge lamp 17 can be easily adjusted by controlling the duty ratio of the rectangular wave current output from the high-pressure discharge lamp lighting means 34 in accordance with the emission intensity ratio.

  By the way, when the high-pressure discharge lamp 17 is pulse-lit, the arc center temperature rises, the arc contracts, and absorption of sodium (Na) D-line is suppressed, so that the color temperature is likely to change. It becomes easy to adjust. However, if the arc tube of the high-pressure discharge lamp 17 is spherical or elliptical, the distance between the electrodes is short, and the effect of suppressing the absorption of D-rays due to arc contraction does not appear remarkably, making it difficult to adjust the color temperature sufficiently. . Therefore, it is preferable to set the aspect ratio inside the arc tube of the high-pressure discharge lamp 17 to the relationship of distance between electrodes / maximum inner diameter of arc tube ≧ 2. By setting in this way and increasing the distance between the electrodes, the effect of suppressing the absorption of D-rays due to arc contraction appears remarkably, and the color temperature can be adjusted efficiently.

  Note that the emission spectrum detecting means 20 is a sensor in which the peak sensitivity of the emission spectrum is 470 nm, 540 nm, and 620 nm, whereas the wavelength of thallium (Tl) is 535 nm and the wavelength of sodium (Na) is 589 nm. May be used. In this case, 535 nm of thallium (Tl) is detected in two wavelength detection regions where the peak sensitivity is 470 nm and 540 nm, and 589 nm of sodium (Na) is detected in two wavelength detection regions where the peak sensitivity is 540 nm and 620 nm. In order to detect, the detection accuracy of 535 nm of thallium (Tl) and 589 nm of sodium (Na) can be stabilized.

11 Lighting equipment
13 Instrument body
17 High pressure discharge lamp
18 High pressure discharge lamp lighting device
20 Emission spectrum detection means
34 High-pressure discharge lamp lighting means
36 Control circuit as control means

Claims (5)

High pressure discharge lamp lighting means for lighting the high pressure discharge lamp;
An emission spectrum detecting means for detecting an emission spectrum of the high pressure discharge lamp which is turned on by the high pressure discharge lamp lighting means;
From the emission spectrum detected by the emission spectrum detection means, the emission intensity ratio of two specific wavelengths resulting from the halide main component enclosed in the high-pressure discharge lamp is obtained, and the high-pressure discharge lamp lighting means according to the emission intensity ratio Control means for controlling the output of;
A high-pressure discharge lamp lighting device comprising: 2. The high-pressure discharge lamp lighting device according to claim 1, wherein the two specific wavelengths are wavelengths caused by thallium (Tl) and sodium (Na) which are halide main components. 3. The high-pressure discharge lamp lighting device according to claim 2, wherein the emission spectrum detection means has peak sensitivity of the emission spectrum at two specific wavelengths caused by thallium (Tl) and sodium (Na). The high pressure discharge lamp lighting device according to any one of claims 1 to 3, wherein the control means controls the duty ratio of the rectangular wave current output from the high pressure discharge lamp lighting means according to the emission intensity ratio. An instrument body with a high-pressure discharge lamp;
A high pressure discharge lamp lighting device according to any one of claims 1 to 4, wherein the high pressure discharge lamp is lit;
An illumination device comprising:

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