JP2010027484A - Lighting control method for light source device, and light source device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To constantly maintain the illuminance of light emitted from a lamp and automatically correct detection sensitivity of an optical sensor deteriorated in sensitivity thereof. <P>SOLUTION: Total lighting time of a lamp 1 is recorded in an IC tag 1a fitted to the lamp 1. The lamp 1 is lighted by a target power capable of obtaining a preset target illuminance, and an optical sensor 15 measures illuminance. When lowering of illuminance exceeds a certain ratio, power to be supplied to the lamp 1 is corrected. In this correction, corrected power corresponding to the total lighting time is obtained by referring a correction table, which regulates a relation between the total lighting time and the corrected power, to control the power to be supplied to the lamp 1. Accurate illuminance data of the light of each of the lamps is obtained by an optical sensor, which is not deteriorated yet, and written in the IC tag 1a. When fitting the lamp to a device, the illuminance data is compared with the illuminance output from the optical sensor 15 provided in a light source device to correct the output of the optical sensor 15. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a lighting control method and a light source device for a light source device that emits light such as ultraviolet rays. In particular, the power supplied to the light source can be controlled in response to changes in light output of the light source over time. Further, the present invention relates to a light source device lighting control method and a light source device capable of calibrating data output from detection means for detecting the illuminance of the light source using data stored in an IC tag provided in the light source. It is.

The UV / O ₃ cleaning method is widely used as a cleaning method in which ultraviolet rays and ozone (O ₃ ) which is an active oxygen species are combined. For example, by irradiating the surface of an LCD substrate or a semiconductor substrate with ultraviolet rays, The object is to remove impurities such as organic compounds adhering to the substrate surface by breaking molecular bonds such as organic compounds adhering to the substrate surface.
In recent years, as a light source used in such a UV / O ₃ cleaning method, for example, xenon gas is used as a luminescent substance instead of a low-pressure mercury lamp that emits ultraviolet rays having wavelengths of 185 nm and 254 nm, which have been conventionally used. An excimer lamp that emits vacuum ultraviolet light having a wavelength of 172 nm and has excellent cleaning ability is used. Such an excimer lamp is disclosed in Patent Document 1, for example.

In a light source device using such an excimer lamp, it is necessary to confirm the lighting state of the excimer lamp in order to perform highly reliable ultraviolet light irradiation processing. However, since the emitted light is mainly vacuum ultraviolet light, the lighting state of the excimer lamp cannot be visually confirmed. Therefore, various methods for confirming the lighting state of the excimer lamp and for confirming the light output emitted from the excimer lamp at the time of lighting have been proposed.
As a method for confirming the lighting state of the excimer lamp, for example, as shown in Patent Document 1, a method is known in which vacuum ultraviolet light emitted from an excimer lamp is detected by a vacuum ultraviolet light sensor.
An excimer lamp device for confirming the lighting state of the excimer lamp by the method of detecting the vacuum ultraviolet light is, for example, as shown in FIG. 11, four excimers in a state where the excimer lamp is mounted on a cooling block 81 constituting a ceiling surface in the casing 80. The cooling block 81 is provided with a light introduction hole 81A, which is a through hole, in the region directly above each excimer lamp 90. A vacuum ultraviolet light sensor 89 is provided at one end of the light introduction hole 81A. Is provided. In the figure, reference numeral 83 denotes a light extraction window for irradiating the object to be processed with light emitted from the excimer lamp 90.

However, since the sensitivity of vacuum ultraviolet light decreases over time, the photosensor that detects vacuum ultraviolet light has an accurate illuminance of vacuum ultraviolet light emitted from the excimer lamp that is the detection target as the usage time increases. It became clear that data could not be obtained.
For example, when the total number of optical sensors that detect vacuum ultraviolet light is used for 6000 hours, the detection amount of the optical sensor is reduced by about 10%. Therefore, when the power supplied to the excimer lamp is adjusted based on the illuminance data of the vacuum ultraviolet light output from the optical sensor, it is determined that the illuminance of the vacuum ultraviolet light emitted from the excimer lamp is low, and the excimer lamp Excessive power is supplied to the excimer lamp, which may shorten the life.

On the other hand, when the excimer lamp is lit for a total of 3000 hours, for example, the illuminance of the vacuum ultraviolet light emitted with the deterioration of the quartz glass or the like constituting the arc tube is reduced by about 70% compared to the initial lighting. For this reason, it is necessary to exchange for a new one regularly.
Since an optical sensor that detects vacuum ultraviolet light is expensive, it cannot be frequently replaced with a new one, and cannot be replaced at the same time as an excimer lamp.
In addition, it is generally difficult to determine whether or not a lamp has reached the end of its service life from the appearance of the lamp. In particular, excimer lamps emit vacuum ultraviolet light that is emitted as the quartz glass or the like constituting the arc tube deteriorates. Since the illuminance of light is reduced, it is difficult to determine from the appearance whether the service life has been reached.
In view of this, an apparatus has been proposed in which an IC tag is provided for each lamp, the total lighting time information of the lamp is stored in the IC tag, and the total lighting time is managed (for example, see Patent Document 2).

FIG. 12 shows a cross-sectional view of an ultraviolet irradiation device equipped with a lamp provided with an IC tag. This figure is a cross-sectional view taken along a plane parallel to the tube axis of the lamp. In the figure, an excimer lamp is used as the lamp.
As shown in the figure, the ultraviolet irradiation device has a metal casing 101 that circulates an inert gas therein. Inside the housing 101, a plurality of excimer lamps 100 are arranged in parallel so that the tube axes are parallel to each other. Along the excimer lamp 100, a bowl-shaped reflecting mirror 102 that reflects ultraviolet rays emitted from the excimer lamp toward the object to be processed is provided corresponding to each excimer lamp 1. Each excimer lamp 100 provided with the reflecting mirror 102 is fixed to, for example, an aluminum cooling block 103 in which a water cooling pipe circulates.

In the excimer lamp 100, sealing portions 100f in which metal foils 100e are embedded are formed at both ends of a light emitting tube 100a made of a dielectric material that transmits vacuum ultraviolet light, and a coil-shaped interior is formed inside the light emitting tube 100a. The electrode 100b is disposed on the tube axis of the arc tube 100a, and the periphery of the internal electrode 100b is covered with an insulator 100d. A net-like external electrode 100c is disposed on the outer surface of the arc tube 100a.
Each metal foil 100e is connected to an external lead 100g protruding outward from the arc tube 100a. A high-voltage power supply cable 120c is connected to the external lead 100g, and a high-voltage power supply terminal 120 is provided at an end thereof. .
A resin connector 110 is attached to the housing 101, and an antenna 140 is provided in the connector 110. The high voltage power supply terminal 120 is attached to the end of the high voltage power supply cable 120 c, and the IC tag 130 is provided in the insulating holder of the high voltage power supply terminal 120.
By inserting the plug of the high-voltage power supply terminal 120 into the connector 110, the internal electrode 100b and the high-frequency lighting power supply are conducted. Although the external electrode 100c is not shown, it is electrically connected to the high frequency lighting power source.

FIG. 13 is a conceptual diagram illustrating a configuration example of a control system for lighting an excimer lamp including the above-described IC tag.
The high voltage power supply terminal 120 of the high voltage power supply cable connected to the electrode of the excimer lamp 1 is connected to the high frequency lighting power source 200 via the connector 110 described above, and excimer lamps are supplied by supplying high voltage / high frequency voltage from the high frequency lighting power source 200. 100 lights up.
As described above, the connector 110 is provided with the antenna 140, and the antenna 140 is connected to the reader / writer 230 for writing data to and reading data from the IC tag. The CPU 210 controls the reader / writer 230 to write data to the IC tag, read data from the IC tag, and controls the high-frequency lighting power source 200 to control the lighting of the lamp 100.

In FIG. 13, the lighting control is performed as follows.
Before the excimer lamp 100 starts lighting, the total lighting time information stored in the IC tag 130 until the previous use is read by the reader / writer 230 via the antenna 140, and this information is read to the memory 220 connected to the CPU 210. Remember information.
The IC tag 130 also stores service life time information that is unique to each excimer lamp 100, and the CPU 210 checks whether the total lighting time read from the IC tag 130 is less than the service life time, When the total lighting time is less than the service life time, a lighting signal is transmitted from the CPU 210 to the high frequency lighting power source 200. Thereby, the high frequency lighting power supply 200 supplies the high voltage high frequency voltage to the excimer lamp 100, and the excimer lamp 100 is lit.

During the lighting of the excimer lamp 100, the latest lighting time information is added to the total lighting time stored in the memory 220 at any time.
When the total lighting time reaches the service life time, the CPU 210 transmits a lighting stop signal to the high-frequency lighting power source 200 and turns off the excimer lamp 100.
If the excimer lamp is turned off before the total lighting time reaches the service life time, the latest lighting time is added to the total lighting time stored in the memory 220 after the excimer lamp is turned off, and the reader / The writer 230 stores the latest total lighting time in the IC tag 130 via the antenna.
By performing the above control, the excimer lamp integrated lighting time information can be efficiently managed for each excimer lamp.

Japanese Patent No. 2789557 JP 2007-123069 A

As described above, when the excimer lamp is lit for 3000 hours in total, for example, the illuminance of the emitted vacuum ultraviolet light is reduced by about 70% compared to the initial lighting.
On the other hand, as described above, as a method for confirming the lighting state of the excimer lamp, a method of detecting vacuum ultraviolet light with an optical sensor is known. However, the sensitivity of this type of optical sensor decreases with time. For this reason, as the usage time becomes longer, accurate illuminance data of light emitted from the lamp cannot be obtained, and even if the power supplied to the lamp is adjusted based on the illuminance data output from the optical sensor, The illuminance cannot be kept constant.
That is, a light sensor whose detection sensitivity deteriorates with time is provided, such as a light source device that turns on an excimer lamp using a light sensor that detects vacuum ultraviolet light, and this light sensor reduces illuminance with time. In the light source device that detects the light of the lamp and controls the illuminance, the illuminance of the lamp decreases with time in addition to the deterioration of the detection sensitivity of the optical sensor. It is extremely difficult to control to a desired value with high accuracy.
In addition, when using an optical sensor whose sensitivity decreases with time as described above, it is desirable to be able to automatically calibrate the detection sensitivity of the optical sensor while the optical sensor remains attached to the light source device. No light source device having such a function is known.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to use a lamp in which the illuminance of light decreases with time, and the sensitivity of the optical sensor for confirming the lighting state of the lamp over time. In a deteriorated light source device, the illuminance of the light emitted from the lamp can be accurately controlled to keep the illuminance constant, and the detection sensitivity of the photo sensor whose sensitivity has deteriorated while the photo sensor remains attached to the light source device Is to be able to calibrate automatically.

In the present invention, the above problem is solved as follows.
A. BACKGROUND OF THE INVENTION The present invention controls the illuminance of light emitted from a lamp so that it matches a target value, and maintains the illuminance constant.
In the excimer lamp, the illuminance of the emitted light decreases with time due to various factors. As described above, in order to maintain the illuminance of the lamp whose illuminance decreases with time, when the illuminance decreases below a predetermined ratio with respect to the target illuminance, control is performed to increase the power supplied to the lamp. It will be necessary.
In the present invention, an IC tag attached to the lamp is used as a means for controlling the power supplied to such a lamp, and the power supplied to the lamp is controlled based on the total lighting time of the lamp recorded on the IC tag. To do.
That is, in the present invention, the detection means detects whether or not the illuminance decrease exceeds a certain ratio, and corrects (increases) the power supplied to the lamp when the illuminance decrease exceeds a certain ratio.
This power correction uses, for example, a correction table that defines the relationship between the total lamp lighting time and the correction power data. And the correction | amendment electric power according to the total lighting time is calculated | required, and the electric power supplied to a lamp | ramp is controlled.
That is, by using the IC tag, the total lighting time of the lamp can be recorded, and correction power data can be obtained based on the total lighting time recorded on the IC tag.
B. In the present invention, the illuminance data output from the vacuum ultraviolet light sensor installed in the apparatus is used in order to cope with the deterioration of the light detection sensitivity due to the deterioration of the light sensor installed in the light source apparatus. Calibrate.
This calibration is performed using values measured by a new optical sensor different from the optical sensor provided in the light source device.
For example, a new sensor installed in a factory or the like is used, and accurate light illuminance data for each lamp is obtained by this new sensor and written in an IC tag provided in each lamp.
Then, for example, when the lamp is replaced, the illuminance is compared with illuminance data output from a sensor installed in the excimer lamp device, and the latter value is corrected upward so that the latter value matches the former value.

Based on the above, in the present invention, the above-described problems are solved as follows.
(1) Record at least the specific illuminance data relating to the illuminance of the light emitted from the light source and the total lighting time of the light source when the light source is lit with a predetermined reference power on the IC tag provided in the light source. .
The light source device includes information reading / writing means from the IC tag, detection means for detecting the illuminance of light emitted from the light source, and a control unit for controlling lighting of the light source. Based on the specific illuminance data read from the IC tag of the light source and the set target illuminance data, target power data necessary for obtaining the target illuminance data is obtained, and the light source is turned on based on the target power data. The detection means detects the illuminance of the light emitted from the light source at that time, and records the detected illuminance as reference illuminance data.
Then, the illuminance of the light source when the light source is continuously turned on based on the target power data is detected by the detection means, and the illuminance data of the light source detected by the detection means is recorded. It is determined whether the reference illuminance data has decreased to a predetermined ratio or less. Correction power corresponding to the total lighting time of the light source based on the total lighting time of the light source read from the IC tag when the illuminance data of the light source decreases below a predetermined ratio with respect to the recorded reference illuminance data Data is obtained, the target power data is corrected based on the corrected power data, and the corrected target power data is supplied to the light source.
(2) In the above (1), when the target power data is corrected and the light source is turned on based on the corrected target power data, the illuminance of the light emitted from the light source measured by the detection means is It is recorded as new reference illuminance data, and it is determined whether the illuminance data of the light source detected by the detecting means has decreased to a predetermined ratio or less with respect to the new reference illuminance data.
(3) In the above (1) and (2), when the IC tag is lit with the predetermined reference power as specific illuminance data relating to the illuminance of light emitted from the light source provided with the IC tag The illuminance of light emitted from the light source is measured and recorded by a calibrated detection means.
The control unit of the light source device turns on the light source with the reference power when a new light source is attached to the light source device, and the light emitted from the light source by the detection unit provided in the light source device. Measure the illuminance.
Based on the illuminance data measured by the detection means provided in the light source device and the specific illuminance data read from the IC tag, a calibration parameter for calibrating the measurement value of the detection means provided in the light source device is obtained. Based on the calibration parameter, the output of the detection means is corrected.
(4) Record at least the specific illumination data relating to the illuminance of light emitted from the light source and the total lighting time of the light source when the light source is turned on with a predetermined reference power on the IC tag provided in the light source. .
The light source device includes a means for reading / writing information from the IC tag, a detecting means for detecting the illuminance of light emitted from the light source, and a control unit for controlling lighting of the light source. Based on the specific illuminance data read from the IC tag and the set target illuminance data, target power data calculating means for obtaining target power data necessary for obtaining the target illuminance data; and Based on the target power data, and the reference illuminance data acquisition means for recording the illuminance data of the light emitted from the light source detected by the detection means at that time in the storage unit as the reference illuminance data, Whether the illuminance of the light source detected by the detecting means when the light source is continuously turned on has decreased to a predetermined ratio or less with respect to the reference illuminance data. When the illuminance data of the light source is determined to have fallen below a predetermined ratio with respect to the recorded reference illuminance data, the light source of the light source obtained based on the total lighting time of the light source read from the IC tag is determined. Correction power data corresponding to the total lighting time is obtained, correction means for correcting the target power data based on the correction power data, and lighting control means for controlling the target power to be supplied to the light source.
(5) In the above (4), when the IC tag is turned on with the predetermined reference power as specific illuminance data relating to the illuminance of light emitted from the light source provided with the IC tag, A value obtained by measuring the illuminance of the light emitted from the light by the calibrated detection means is recorded.
The control unit of the light source device includes calibration means for the detection means whose sensitivity deteriorates with time, and the calibration means turns on the light source with the reference power when a new light source is attached to the light source device. And detecting means provided in the light source device based on the illuminance of the light emitted from the light source detected by the detecting means provided in the light source device and the specific illuminance data read from the IC tag. A calibration parameter for calibrating the measured value is obtained, and the output of the detection means is corrected based on the calibration parameter.
(6) In a light source to which an IC tag is attached, the IC tag is used as specific illuminance data relating to the total lighting time of the light source and the illuminance of light emitted from the light source provided with the IC tag. The illuminance of the light emitted from the light source measured by the calibrated detection means when it is turned on with a predetermined reference power is recorded.

In the present invention, the following effects can be obtained.
(1) In the present invention, the light source is turned on with the target power data necessary to obtain the target illuminance data, the illuminance at that time is detected by the detection means, recorded as the reference illuminance data, and detected by the detection means. When the illuminance of the light source decreases to a predetermined ratio or less with respect to the recorded reference illuminance data, correction power data is obtained based on the total lighting time of the light source read from the IC tag, and the correction power data Since the target power data is corrected and supplied to the light source, the illuminance of the light source can be kept constant even when the illuminance of the vacuum ultraviolet light of the lamp decreases with time.
Moreover, according to the light source device of the present invention, every time the illuminance of the light detected by the detection means decreases beyond a predetermined range, the latest illuminance reduction of the lamp and the sensitivity of the detection means are taken into account. The reference illuminance data is recorded, and the correction power data is obtained based on the reference illuminance data, and the light source is controlled, so that the illuminance can be maintained almost constant with high accuracy.
(2) The illuminance of the light emitted from the light source when the IC tag is turned on with a predetermined reference power is measured by the calibrated detection means, recorded as inherent illuminance data, and newly added to the light source device. When the light source is attached, the light source is turned on with the reference power, and the illuminance of the light emitted from the light source is measured by the detection means provided in the light source device, and the illuminance data and the IC tag are read out. Since the detection means of the light source device is calibrated based on the specific illuminance data, the illuminance data output from the sensor should be calibrated every time an excimer lamp whose service life has ended is replaced with a new one. Even if the light sensor installed in the light source device is deteriorated by long-time use, accurate illuminance can be obtained.
For this reason, the illuminance of the light emitted from the lamp can be accurately controlled, and the illuminance of the light irradiated to the object to be processed by the supply of excess power to the excimer lamp, which has been a problem in the past, is a target. It is possible to eliminate problems such as overshooting that greatly exceeds the illuminance and shortening the lamp life.

FIG. 1 is a diagram showing a system configuration of a light source apparatus according to an embodiment of the present invention.
As shown in the figure, the light source device of the present invention is for supplying a light source (hereinafter referred to as a lamp) 1 having an IC tag 1a capable of inputting recording information in a non-contact manner and a high frequency high voltage to the lamp 1. A lighting power source 2, a transformer 3 provided on the output side of the lighting power source 2, a control unit 4 that controls lighting of the lamp 1, and an input unit 5 are provided.
The controller 4 detects the light such as vacuum ultraviolet light emitted from the lamp 1 and outputs an illuminance signal, and the lamp 1 is turned on based on the illuminance data of the light sensor 15 and the like. And an arithmetic processing unit (CPU) 11 that performs arithmetic processing for calibrating the optical sensor 15, a storage unit 13, and an antenna 14 for transmitting and receiving data between the IC tag 1a, It comprises an IC tag R / W unit 12 that controls transmission / reception of data to / from the IC tag 1a, A / D converters 16a and 16b, and a D / A converter 17. The A / D converters 16a and 16b convert the signal from the optical sensor 15 and the signal from the lighting light source 2 into digital signals and send them to the CPU 11, and the D / A converter 17 converts the digital signals from the CPU 11 into analog signals. Converted and sent to the lighting power source 2.

The storage unit 13 includes a readable / writable volatile memory (RAM 13a), a read-only nonvolatile memory (ROM 13b), and a rewritable nonvolatile memory (EEPROM 13c), and stores programs and data.
The ROM 13b of the storage unit 13 stores information such as a correction table Tab for correcting the power supplied to the lamp 1 according to the total lighting time, standard illumination data X ₀ of the excimer lamp, reference power data Z _{0 and the} like. In the EEPROM 13c, information necessary to stably maintain the illuminance of the vacuum ultraviolet light emitted from the excimer lamp is recorded.

The light source 1 is an excimer lamp in which a discharge gas such as xenon gas is enclosed and emits vacuum ultraviolet light having a wavelength of 172 nm. Hereinafter, a case where the lamp 1 is an excimer lamp will be described.
The IC tag 1a is provided for each lamp, and the percentage Y [= (specific illuminance data X ₁ / standard illuminance data X ₀ ) × 100] corresponding to the specific illuminance data X ₁ relating to the illuminance specific to each excimer lamp. The total lighting time Ts is recorded.
When the lamp is an excimer lamp, the optical sensor 15 is a vacuum ultraviolet light sensor, and includes, for example, a semiconductor photosensor such as ALGN (aluminum gallium nitride), a phosphor that converts ultraviolet light into visible light, and the like.
As shown in FIG. 11 described above, the optical sensor 15 is disposed on one end side of the light introduction hole formed in the cooling block, and the vacuum ultraviolet rays from the lamp 1 are transmitted through the light introduction hole to the light of the optical sensor 15. Incident on the incident surface.

As described above, the sensitivity of the vacuum ultraviolet light sensor decreases as the usage time increases.
For example, as shown in FIG. 3C, the sensitivity of the vacuum ultraviolet light decreases by about 30% after 3000 hours from the start of use.
That is, the illuminance data output from the optical sensor 15 has a value lower than the illuminance of the vacuum ultraviolet light emitted from the actual lamp 1. Therefore, if the power supplied to the lamp 1 is controlled based on the illuminance data from the optical sensor 15 so that the illuminance of the vacuum ultraviolet light emitted from the lamp 1 is kept constant, excessive power supply to the lamp 1 is performed. Will do.
Therefore, as shown in A of FIG. 3, the illuminance of the excimer lamp becomes higher than the target illuminance of B of FIG. 3, which causes overshoot. In order to avoid such an overshoot, it is necessary to correct a decrease in sensitivity of the vacuum ultraviolet light that occurs as the optical sensor 15 deteriorates.

As will be described later, the CPU 11 of the control unit 4 targets the illuminance of the vacuum ultraviolet light emitted from the lamp 1 based on the target illuminance data given from the input unit 5 or the illuminance data detected by the optical sensor 15. A command is sent to the lighting power supply 2 to match the illuminance, and the power supplied to the lamp 1 is controlled. Further, based on the illuminance data detected by the optical sensor 15 and the specific illuminance data read from the IC tag 1a included in the lamp 1, the optical sensor is set so that the illuminance data output from the optical sensor 15 matches the specific illuminance data. Calibrate 15 outputs.
The input unit 5 is a touch panel type having, for example, a liquid crystal display screen, and is used by the user of the light source device to input target illuminance data related to the illuminance of vacuum ultraviolet light required for each object to be processed to the CPU 11. Is done.

Here, various data used in the present embodiment are collectively shown. For example, as shown below, these data are stored in an IC tag, a read-only nonvolatile memory (ROM 13b), a rewritable nonvolatile memory (EEPROM 13c), etc. It is transferred to and stored in a possible memory (RAM 13a).
The storage location of these data can be changed as appropriate. For example, all data may be stored in an EEPROM without providing a ROM, or in a so-called memory medium (for example, a nonvolatile memory or a magnetic disk). It may be stored, expanded in the runtime RAM 13a, and saved in a non-volatile memory or storage medium when finished.
Further, in the following description, in order to facilitate understanding, even when data is transferred to the RAM, the data storage location may be specified at the location stored at the time of activation of the apparatus, if necessary.
Standard illuminance X ₀ : Illuminance of vacuum ultraviolet light emitted from a standard excimer lamp
(Stored in ROM)
• Specific illuminance X ₁ : Specific illuminance of the lamp recorded on the IC tag (stored in IC tag, EEPROM M)
- Found illuminance X _2: illuminance data target illuminance obtained from the optical sensor device installed X _3: target illumination set from the input unit (stored in EEPROM)
- reference illumination X _4: storage after the initial or power correction, or the target power data Z _1, when the correction power data Z ₂ was the lamp lit, the illuminance data (EEPROM are obtained found from the optical sensor device installation )
Reference power Z ₀ : Power required for a standard excimer lamp to output standard illuminance X ₀
(Stored in ROM)
· Target power Z _1: power required to obtain a luminance which is a target (stored in EEPROM)
・ Corrected power Z ₂ : Target power corrected by the corrected power coefficient (stored in EEPROM)
Correction coefficient K = Inherent illuminance X ₁ / Measured illuminance X ₂
Percentage Y = (Inherent illuminance X ₁ / Standard illuminance X ₀ ) × 100
(Stored in IC tag and EEPROM)
-Total lighting time Ts: Integrated value of lamp lighting time (stored in IC tag, EEPROM)
-Correction table Tab: A table (stored in ROM) that records the amount of power increase (correction power coefficient) relative to the total lighting time.

FIG. 2 is a functional block diagram of the light source device according to the embodiment of the present invention, and shows a function realized by processing executed by the CPU 11 of the control unit 4 as a block diagram.
As described above, the percentage Y = (inherent illuminance X ₁ / standard illuminance X ₀ ) × 100 and the total lighting time Ts of the lamp 1 are recorded in the IC tag 1 a provided in the lamp 1.
The intrinsic illuminance X ₁ is a calibrated optical sensor that outputs the illuminance of light emitted from the lamp 1 when the lamp 1 is lit with the reference power, such as a new optical sensor, for example. It is the data measured by.
The IC tag R / W unit 12 reads the data recorded in the IC tag 1a via the antenna 14 as described above, and stores it in the storage unit 13 as IC tag data.

Calibration means 4f of the control unit 4, when new lamp 1 (total lighting time Ts is 0 lamp) is attached to the light source device, the lighting control unit 4e, is lit the lamp 1 by the reference power Z ₀ calibration and illuminance of light emitted from the lamp 1 is detected by the optical sensor 15, based on the specific illuminance X ₁ read from the IC tag 1a, the measured value of the detection means provided in the light source apparatus Determine the calibration parameter to be used. Then, the output of the optical sensor 15 is corrected based on the calibration parameter.
Thus, each time the lamp 1 is replaced with a new lamp, the optical sensor 15 can be calibrated so as to output a correct measurement value.
The integration timer 4g of the control unit 4 counts the time during which the lamp 1 is lit, and the total lighting time update means 4a updates the total lighting time stored in the storage unit 13 every time a predetermined integration time is reached. . The updated total lighting time Ts is written in the IC tag 1a provided in the lamp 1 when the operation of the light source device is stopped.

As described above, the target illuminance X ₃ is input from the input unit 5 to the CPU 11, and this data is stored in the storage unit 13.
The target power calculation means 4b of the control unit 4 uses the target illuminance X ₁ based on the specific illuminance X ₁ calculated based on the percentage Y read from the IC tag 1a, the reference power Z ₀ , and the target illuminance X _{3. The} target power Z ₁ necessary to obtain ₃ is calculated. Target power Z ₁ calculated is stored in the storage unit 13.
Reference illumination data acquisition means 4d, at the time of power correction for device startup or later, the lamp 1 is lit based on the target power Z ₁ or compensation power Z ₂ by the lighting control means 4e, detected by the optical sensor 15 at that time The illuminance data of the light to be obtained is obtained. This value is stored in the storage unit 13 as the reference illumination data X _4.

Lighting control means 4e, the power supplied to the lamp 1 controls the lighting power source 2 as the target power calculating means 4b target power Z ₁ calculated by the (corrected correction power Z ₂₎ matches.
That is, the voltage and lamp current applied to the lamp 1 are detected and sent from the lighting power source 2 to the lighting control means 4 e of the control unit 4. The voltage and current detected by the lighting power supply 2 are analog signals, and the analog signals are converted into digital signals by the A / D converter as described above and sent to the CPU of the control unit 4.
The lighting control means 4e calculates the power supplied to the lamp from the voltage and current, and compares the calculated power with the target power Z ₁ (corrected power Z ₂ after correction). Then, the lamp voltage and frequency are calculated so that the calculated power matches the target power Z ₁ (corrected power Z ₂ after correction). The lamp voltage and frequency are sent to the lighting power source 2 as a voltage command and a frequency command.
The lighting power source 2 controls the driving voltage and frequency of the lamp 1 according to the voltage command and frequency command. Thus, the power supplied to the lamp 1 is controlled so as to coincide with the target power Z ₁ (corrected power Z ₂ after correction), and the lamp 1 is set to the target power Z ₁ (corrected power Z ₂ after correction). Lights up according to the illuminance.
Here, in the excimer lamp, the illuminance of the emitted light decreases as time passes as described above. Therefore, at the beginning of lighting, by supplying power according to the target power data to the lamp 1, the lamp 1 is lit with the illuminance that matches the target illuminance, but the illuminance of the lamp 1 as the lighting time elapses. Will decline.

Correction power calculation means 4c, as decrease in the illuminance of the lamp 1 is corrected, the target power Z ₁ were corrected to obtain the corrected power Z _2.
In other words, the corrected power calculating means 4c detects the illuminance (actually measured illuminance X) detected by the light sensor 15 when the lamp 1 is continuously turned on based on the target power Z ₁ (corrected power Z ₂ after correction). ₂ ) is obtained, and it is determined whether the measured illuminance X ₂ has fallen below a predetermined ratio with respect to the reference illuminance X ₄ .
The correction power calculation means 4c is measured illuminance X ₂ of the lamp 1, the when drops below a predetermined percentage of the reference illumination X _4, reads the total lighting time Ts of the lamp 1, which is stored in the storage unit 13 Referring to the correction table Tab stored in the storage unit 13, the corrected power data Z ₂ corresponding to the total lighting time Ts is obtained and stored in the storage unit 13.

The illuminance of the vacuum ultraviolet light emitted from the excimer lamp decreases with time due to various factors. In order to correct this decrease in illuminance, it is necessary to increase the power supplied to the excimer lamp. In the correction table Tab, as shown in FIG. 4, the relationship between the total lighting time of the excimer lamp and the power correction coefficient. Is stipulated.
That is, for each excimer lamp, the relationship between the total lighting time and the illuminance reduction rate of the vacuum ultraviolet light is obtained in advance, and the power increase required to maintain the illuminance of the vacuum ultraviolet light constant based on this relationship The rate is obtained, and the relationship between the total lighting time and the power correction coefficient is registered in the correction table. Thus, reading the power correction coefficient of the correction table, by multiplying the target power Z _1, it is possible to obtain the correction power data Z _2.
When the corrected power data Z ₂ is calculated, the lighting control means 4e calculates the lamp voltage and frequency so that the power supplied to the lamp becomes the corrected corrected power data Z ₂ as described above, and the lighting power source Send to 2. The lighting power source 2 lights the lamp 1 with this lamp voltage and frequency.

Further, when the corrected power data Z ₂ is calculated and the lamp 1 is turned on based on the corrected power data Z ₂ , the reference illuminance data acquisition means 4d is emitted from the lamp 1 measured by the optical sensor 15. the illuminance of the light, in the storage unit 13 as a new reference illuminance X _4.
Hereinafter, in the same way as described above, with respect to the reference illumination X _4, when the illuminance detected by the optical sensor 15 judges whether drops below a predetermined ratio, falls below a predetermined rate, in the same manner as described above Correction power data Z ₂ corresponding to the total lighting time is obtained.

  Thus, each time the lamp 1 is lit with a constant power and the illuminance of the lamp 1 falls below a predetermined ratio with respect to the latest corrected reference illuminance, according to the total lighting time of the lamp, Since the electric power supplied to the lamp 1 is increased and the illuminance of the lamp 1 is corrected upward, the illuminance of the lamp 1 can be kept substantially constant even if the illuminance of the lamp 1 decreases with time. Moreover, since the detection value by the optical sensor 15 is used to determine whether or not the illuminance of the lamp 1 has decreased to a predetermined ratio or less with respect to the reference illuminance, the detection sensitivity of the optical sensor 15 has changed over time. Even if it falls, it is not greatly affected.

Next, the operation of the light source device of the present embodiment will be described in detail with reference to a flowchart.
1. Recording of Data on IC Tag and Calibration of Optical Sensor (1) Recording of Data on IC Tag First, the process of recording the percentage Y corresponding to the specific illuminance data X ₁ on the IC tag will be described with reference to FIG.
The light source device shown in FIG. 1 is different from the light sensor 15 whose sensitivity may be deteriorated, for example, a new light sensor provided in a factory or a light source device using a calibrated light sensor. And the above data is recorded on the IC tag 1a of the lamp 1. This light source device may have, for example, a configuration similar to that shown in FIG. 1 except that the optical sensor is new or calibrated. Hereinafter, the light source device shown in FIG. Although the case of writing data to the tag 1a will be described, a dedicated device for writing an IC tag may be used. That is, using a dedicated device, the illuminance of the lamp is measured with a new or calibrated photosensor, the percentage Y corresponding to the specific illuminance data X ₁ is calculated, and the IC tag writing device is used to calculate the IC. Data may be written to the tag 1a.
In the following flowchart, the recording of the percentage Y corresponding to the specific illuminance data X ₁ will be described. In addition to this data, the total lighting time is recorded in the IC tag, and in the case of a new lamp, 0 is recorded as the total lighting time.

(Step S101)
First, the reference power Z ₀ recorded in the read-only memory (ROM) 13b is read, and the lamp 1 is turned on with the reference power Z ₀ .
(Step S102)
It is confirmed whether the illuminance of the vacuum ultraviolet light emitted from the lamp 1 is stable. In this confirmation, for example, it is determined whether or not the illuminance change becomes 1% or less in 5 minutes. If the illuminance is stable, the process proceeds to step S104.
(Step S103)
If the illuminance is unstable, check if it has timed out. If the illuminance is stable within 30 minutes, the process returns to step S101. If the illuminance is not stable as described above even after 30 minutes, it is determined that the lamp 1 is defective and the process ends.
(Step S104)
It acquires specific illuminance data X ₁ when illumination is stable. Analog signals from the light sensor 15, while being converted into a digital signal by the A / D converter 16b, the digital signal is input to CPU11 as specific illuminance data X _1.
(Step S105)
Value corresponding to the specific illuminance data X ₁ that is input to the CPU is recorded in the IC tag 1a. Here, as shown in the following equation (1), the specific illuminance data X ₁ is an IC tag as a percentage Y of the specific illuminance data X _{1 with} respect to the standard illuminance data X ₀ stored in the read-only memory (ROM) 13b. 12 is recorded.
Y = (X ₁ / X ₀ ) × 100 (1)

(2) Calibration of Optical Sensor Next, the calibration operation of the optical sensor will be described with reference to a flowchart. This operation corresponds to the operation realized by the calibration means 4f in FIG.
FIG. 6 is a flow for calibrating the optical sensor 15 based on the data recorded in the IC tag. The calibration is performed before executing the light irradiation process on the object to be processed every time the lamp whose life has ended is replaced with a new one. The optical sensor 15 is not corrected until the end of the service life of the lamp.
(Step S201)
First, the CPU 11 accesses the IC tag R / W unit 12, transmits a command to the IC tag 1 a via the antenna 14 at a carrier frequency of 135 kHz, reads information from the IC tag 1 a by bidirectional communication, and this information Is received by the CPU 11 via the IC tag R / W unit 12.
The CPU 11 checks whether the lamp 1 is new from the total lighting time recorded on the IC tag 1a. If the total lighting time Ts = 0, it is determined that the lamp 1 is new and the process proceeds to step S202. On the other hand, if the total lighting time Ts is not 0, the optical sensor 15 is not calibrated and the process ends.

(Step S202)
The CPU 11 acquires the percentage Y of the inherent illuminance data X ₁ recorded on the IC tag 1a. That is, a command is transmitted from the IC tag R / W unit 12 to the IC tag 1 a at a carrier frequency of 135 kHz, and the percentage Y is acquired from the IC tag 1 a via the antenna 14.
(Step S203)
Next, the lamp 1 is turned on with the reference power Z ₀ recorded in the read-only memory (ROM 13b) of the storage unit 13.
(Step S204)
It is confirmed whether the illuminance of the light emitted from the lamp 1 is stable. In this confirmation, for example, it is determined whether or not the illuminance change becomes 1% or less in 5 minutes. If the illuminance is stable, the process proceeds to step S206.
(Step S205)
If the illuminance is unstable, check if it has timed out. When the illuminance is stabilized within 30 minutes, the process returns to step S201, and the processes of steps S201 to S204 are executed. If the illuminance is not stable as described above even after 30 minutes, it is determined that the lamp 1 is defective and the process is terminated.
(Step S206)
Next, the illuminance of light emitted from the lamp 1 is detected by the optical sensor 15. Analog signal from the optical sensor 15 is converted into a digital signal by the A / D converter 16b, the digital signal is input to CPU11 as measured illuminance data X _2.

(Step S207)
Finally, based on the measured illuminance data X ₂ obtained at specific illuminance data X ₁ and step S206 acquired in step S202, to correct the illumination data outputted from the optical sensor 15. The correction in step S207 is performed as follows.
(i) the standard illuminance data X ₀ read out from a read-only memory (ROM 13b) of the storage unit 13, based on the IC tag 1a in the read-out percentage Y, it calculates the value of the intrinsic illuminance data X _1.
As shown in (2) below, a correction coefficient K that is a ratio of the inherent illuminance data X ₁ to the measured illuminance data X ₂ is obtained.
Correction coefficient K = (Inherent illuminance data X ₁ ) / (Measured illuminance data X ₂ ) (2)
(ii) Multiply the measured illuminance data X ₂ by the correction coefficient K obtained by the equation (2).

As described above, pre-record the percentage Y indicating the specific illuminance data X ₁ in the IC tag by using the optical sensor of the optical sensor or the calibrated new in a factory or the like, a specific illuminance data X ₁ obtained therefrom, the light source The measured illuminance data output from the vacuum ultraviolet light sensor can be corrected by the correction coefficient K obtained based on the measured illuminance data X ₂ obtained from the optical sensor installed in the apparatus.
Accordingly, every time an excimer lamp whose service life is finished is replaced with a new one, the correction coefficient K is obtained and stored, and the illuminance data output from the sensor is corrected by the correction coefficient K, thereby excimer Even if the vacuum ultraviolet light sensor installed on the lamp is deteriorated by long-term use, accurate illuminance of vacuum ultraviolet light can be obtained.
Therefore, according to the present invention, an overshoot in which the illuminance of the vacuum ultraviolet light applied to the object to be processed greatly exceeds the target illuminance due to the excessive power supply to the excimer lamp, which has been a problem in the past, may occur. The problem that the life of the excimer lamp is shortened can be solved.

2. Optical Stabilization Control (1) Overall Process Flow First, the overall process flow of the light source device of this embodiment will be described.
FIG. 7 is a flowchart showing the flow of overall processing of the light source device of the present embodiment.
As shown in FIG. 7, the light source device operates as follows.
(Step S1)
The device is activated.
(Steps S2, S3)
Data is acquired from an IC tag provided on the lamp. It is determined from the total lighting time data acquired from the IC tag whether the lamp is a new lamp (total lighting time is 0) (step S4).
If the lamp is a new lamp, the lamp 1 is turned on with the reference power Z ₀ , and the illuminance is measured by the optical sensor 15. Then, as described above, based on the measured actual illuminance and the specific illuminance X ₁ obtained from the percentage Y read from the IC tag, a calibration parameter for calibrating the output of the optical sensor 15 is obtained, and based on the calibration parameter, The output of the optical sensor 15 is corrected.

(Step S5)
If lamp of the lamp is new, determine the target power Z ₁ on the basis of the target illumination X ₃ which are specific illuminance X ₁ and set read from the IC tag as described above, the lamp power is the target power Z ₁ Control to match.
Here, as described above, the illuminance when the lamp 1 is turned on based on the target power Z ₁ is detected by the optical sensor 15, and when the illuminance falls below a predetermined ratio with respect to the reference illuminance X ₄ , the total lighting is performed. The corrected power Z ₂ obtained based on the time Ts is obtained, and the target power Z ₁ is corrected.
(Steps S6 and S7)
The above operation is continued until the lamp is extinguished. When the lamp is extinguished, the lamp is extinguished, and necessary data is saved in a rewritable non-volatile memory (EEPROM), and the total lighting time of the IC tag. Rewrite.

(2) Light stabilization control The illuminance of light emitted from the lamp decreases with time. In order to keep the illuminance constant, it is necessary to control to increase the electric power supplied to the lamp when the illuminance of the lamp falls below a predetermined ratio with respect to the target illuminance.
In the light source device of this embodiment, as described in the flow of FIG. 8 below, in order to control the power supplied to the lamp, the total lighting time of the lamp recorded in the IC tag is used, and based on this, The power correction amount (corrected power) is obtained.
FIG. 8 is a flowchart showing a control process for maintaining the illuminance of light emitted from the lamp constant.
(Step S301)
The CPU 11 accesses the IC tag R / W unit 12, transmits a command to the IC tag 1a via the antenna 14 at a carrier frequency of 135 kHz, reads information from the IC tag 1a by bidirectional communication, and reads this information into the IC tag 1a. Received by the CPU 11 via the tag R / W unit 12. Thereby, the percentage Y and the total lighting time Ts corresponding to the specific illuminance data X ₁ recorded on the IC tag can be acquired.
(Step S302)
Based on the total lighting time Ts obtained in step S301, it is confirmed whether the lamp 1 is new. If the total lighting time Ts = 0, it is determined that the lamp 1 is new and the process proceeds to step S304. On the other hand, if the total lighting time Ts is not 0, the process proceeds to step S303.

(Step S303)
If not total lighting time Ts = 0, the storage unit 13 (EEPROM13c) and the target power data Z ₁ when the lighting the lamp earlier stored, acquires a target power data Z ₁ of the already stored.
(Step S304)
Target illuminance data X ₃ input from the input unit 5 and stored in the storage unit 13 is acquired. (Step S305)
Based on the target illuminance data X ₃ obtained in step S304, the percentage Y read from the IC tag 1a, the standard illuminance data X ₀ and the reference power data Z ₀ read from the storage unit 13 (ROM 13b), the target illuminance The target power data Z ₁ necessary for obtaining is obtained.
The target power data Z ₁ is obtained as follows.
Specific illuminance X ₁ : Target illuminance X ₃ = Reference power Z ₀ : Target power Z ₁
Target power Z ₁ = reference power Z ₀ × target illuminance X ₃ / specific illuminance X ₁
The target power data Z ₁ obtained as described above is recorded in the storage unit 13 (EEPROM 13c).
(Step S306)
The integration timer (4g in FIG. 2) is turned on and measurement of the lighting time to be added to the total lighting time is started.
(Step S307)
Step S303 or on the basis of the target power data Z ₁ obtained in step S305, it turns on the lamp 1.

FIG. 9 is an explanatory diagram conceptually showing a change in illuminance with respect to the lighting time and a change in power supplied to the lamp in order to facilitate understanding of the processes of steps S308 to S313 below. The vertical axis of the figure shows the illuminance of the lamp light (the illuminance value and target illuminance measured by the optical sensor whose sensitivity deteriorates), and the horizontal axis of the figure shows the lamp lighting time.
Note that the solid line in the figure indicates the target illuminance, and the thick solid line indicates the illuminance value measured by the deteriorated sensor. Also, the alternate long and short dash line in the figure shows how the illuminance of the vacuum ultraviolet light emitted from the lamp decreases over time due to various factors, and the broken line in the figure is output from the sensor as the sensitivity of the optical sensor decreases. This shows how the illuminance data decreases over time.
With reference to FIG. 9, the outline of the process executed in the following steps S308 to S313 will be described.
At the time of lamp replacement, correction of the optical sensor 15 shown in the flowchart of FIG. 6 is executed, and correction of the optical sensor 15 shown in the flowchart of FIG. 6 is not performed while the lamp is on.

The illuminance P ₁ at time T ₀ in FIG. 9 is the initial reference illuminance X ₄ when the excimer lamp is turned on based on the target power data Z ₁ in step S307.
As shown in FIG. 9, the lamp is turned on at a constant power (target power), and supplied to the lamp at the time T ₁ when the illuminance of the lamp decreases to P ₂ that is equal to or less than a predetermined ratio with respect to the initial reference illuminance P ₁ . The power is corrected, and the illuminance of the lamp is corrected upward from P ₂ to P ₃ .
As will be described later, this correction is performed as follows.
With reference to the correction table Tab shown in FIG. 4, the correction power coefficient corresponding to the total lighting time Ts at that time stored in the storage unit 13 is read out, and this correction power coefficient is stored in the storage unit 13 as the target at that time By multiplying the electric power, the corrected electric power Z ₂ is obtained, and this electric power is supplied to the lamp 1. Then, the illuminance of the lamp 1 at this time is detected by the optical sensor 15, the reference illuminance P ₃ after correction (= X _4).
The illuminance P ₃ that the upper correction as a reference illuminance corrected. The corrected reference illuminance P ₃ is set to a value on a one-dot chain line in the figure in order to cope with a decrease in the illuminance of the lamp light with time and a decrease in the sensitivity of light in the optical sensor with time. Is done.

After that, the lamp is continuously lit at a constant power, and the lamp is supplied to the lamp in the same manner as described above at the time T ₂ when the lamp illuminance is reduced to P ₄ which is a predetermined ratio or less with respect to the corrected reference illuminance P ₃ . The power is corrected and the illuminance of the lamp is corrected upward from P ₄ to P ₅ . This upwardly corrected illuminance P ₅ is set as a corrected reference illuminance X ₄ .
The corrected reference illuminance P ₅ (= X ₄ ) is such that the illuminance of the lamp light decreases with time and the sensitivity of the vacuum ultraviolet light in the optical sensor decreases with time, as in P ₃ above. Is set to a value on an alternate long and short dash line in FIG.
In this way, basically the lamp is lit at a constant power, and every time the lamp illuminance falls below a predetermined ratio with respect to the latest corrected reference illuminance, the lamp illuminance is increased by increasing the power supplied to the lamp. Is corrected upward. Therefore, every time power correction is performed, the old corrected reference illuminance data X ₄ is sequentially updated to the new corrected reference illuminance data X ₄ in time series, and only the latest corrected reference illuminance data is stored. Recorded in the unit 13 (EEPROM 13c).

Returning to the flow of FIG. 8, the processes after step S308 will be described.
(Step S308)
The light sensor detects the illuminance of light emitted from the lamp. The analog signal from the optical sensor 15 is converted into a digital signal by the A / D converter 16b shown in FIG. 1, and is input to the CPU as initial reference illuminance data X ₄ (corresponding to the illuminance P ₁ in FIG. 9). The initial reference illuminance data X ₄ is recorded in the storage unit 13 (EEPROM 13c).
(Step S309)
Illuminance data of light detected by the light sensor, the reference illuminance data X ₄ obtained in step S308, checks whether drops below a predetermined rate. The predetermined ratio varies depending on the type of the object to be subjected to the light irradiation process, and is, for example, 10%.
For example, when explained with reference to FIG. 9, when the illuminance data P ₂ at the time of T ₁ is decreased more than 10% relative intensity data P ₁ proceeds to step S310. If the decrease in the illuminance data P ₂ with respect to the illuminance data P ₁ does not exceed 10%, the process proceeds to step S313.

(Step S310)
The correction table Tab (see FIG. 4) recorded in the storage unit 13 (ROM 13b) is read out, and the total lighting time Ts stored in the storage unit 13 is applied to the correction table Tab, thereby correcting the total lighting time Ts. Get power factor.
As described above, the correction power coefficient is set to bring the power supplied to the lamp to a level necessary for upward correction of the illuminance data P ₂ in FIG. 9 to P ₃ .
Note that P ₃ in FIG. 9 is set corresponding to a decrease in sensitivity of the optical sensor over time with reference to the correction table Tab in FIG. For example, when the total lighting time of the excimer lamp is 2000 hours, the correction power coefficient is obtained as 1.1. The corrected power data Z ₂ determined based on the corrected power coefficient is recorded in the storage unit 13.
(Step 311 and Step S312)
The CPU 11 sends a command to the lighting power source 2 based on the corrected power data Z ₂ obtained in step S310, and increases the power supplied to the lamp 1 via the lighting power source 2.
The illuminance of light emitted from the lamp 1 is detected by the optical sensor 15 when the lamp 1 is turned on based on the corrected power data Z ₂ . Analog signal from the optical sensor 15, the A / D converter 16b (see FIG. 1) is converted into a digital signal, is recorded in the storage unit 13 is input as a reference illumination data X ₄ after the correction to CPU 11. Reference illumination data X ₄ after the correction corresponds to the intensity P3 of FIG.
(Step S313)
The CPU 11 confirms whether a lamp turn-off signal is input. When a lamp turn-off signal is input, power supply to the lamp 1 is stopped and the lamp is turned off.
If the excimer lamp extinguishing signal is not input in step S313, the process returns to step S309, and the processes of steps S309 to S312 are repeatedly executed.

Step S313 process when returning to the step S309 is the same as that described above, in step S309, illuminance data detected by the optical sensor 15, the reference illumination data X ₄ after obtained correction in step S312 On the other hand, for example, it is confirmed whether it has decreased by 10% or more, and when it has decreased by 10% or more, the process proceeds to step S310. If the decrease in illuminance does not exceed 10%, the process proceeds to step S313.
Then, as described above, with reference to the correction table Tab, the correction power coefficient corresponding to the total lighting time Ts is acquired, and the correction power data Z ₂ determined based on the correction power coefficient is recorded in the storage unit 13. The
As described above, the CPU 11 sends a command to the lighting power source 2 based on the corrected power data Z ₂ to increase the power supplied to the lamp 1.
Further, the illuminance when the lamp 1 is turned on based on the corrected power data Z ₂ is detected by the optical sensor and stored as the corrected reference illuminance data X ₄ .
Thus, until the lamp extinction signal is input to the CPU 11, the old reference illuminance data and the corrected power data are recorded in the EEPROM 13c while being sequentially updated to the latest reference illuminance data and corrected power data. Is done. Only the latest reference illuminance data and correction power data are stored in the storage unit 13 (EEPROM 13c).

FIG. 10 is a flowchart showing processing when the light is turned off.
In the figure, the following processing is performed when the light is turned off.
(Step S11)
The lamp is turned off. When the lamp is an excimer lamp, for example, when the lamp is extinguished, a high frequency voltage is applied at a low voltage to suppress the polarization of the discharge vessel and extinguish the lamp.
(Step S12)
The lighting power source 2 is turned off and the integration timer is turned off.
(Step S13)
Data in the storage unit 13 is written to the IC tag of the lamp, and the contents of the RAM serving as a read / write memory are saved in a nonvolatile memory such as an EEPROM as necessary. (Step S14)
Turn off the control unit.

As described above, the light source system according to the present embodiment obtains corrected power data based on the correction table and the total lighting time recorded in the IC tag when the illuminance of the lamp light decreases beyond a predetermined range. The power supplied to the excimer lamp is controlled based on the corrected power data.
Therefore, the illuminance of the lamp can be kept constant even when the illuminance of the vacuum ultraviolet light of the lamp decreases with time.
Moreover, every time the illuminance of the lamp falls below a predetermined range, the latest reference illuminance data corresponding to the decline in illuminance over time of the lamp and the sensitivity of the optical sensor is recorded. Even if it decreases, the illuminance of the lamp can be kept constant with high accuracy.

It is a figure which shows the system configuration | structure of the light source device which is one Embodiment of this invention. It is a functional block diagram of the light source device of one Embodiment of this invention. It is a figure explaining the sensitivity fall of a photosensor. It is the correction table which recorded the relationship between total lighting time and a power correction coefficient (power increase amount). The IC tag is a flowchart illustrating a process of recording the percentage Y corresponding to the specific illuminance data X _1. It is a flowchart which shows the process which calibrates the optical sensor 15 based on the data recorded on the IC tag. It is a flowchart which shows the flow of the whole process of the light source device of this embodiment. It is a flowchart which shows the control processing for maintaining the illumination intensity of the light radiate | emitted from a lamp | ramp constant. It is explanatory drawing which shows the illumination intensity change with respect to lighting time, and the change of the electric power supplied to a lamp | ramp. It is a flowchart which shows the process at the time of light extinction. It is a figure which shows the structural example of the excimer lamp apparatus which confirms a lighting state. It is sectional drawing cut | disconnected by the plane parallel to the tube axis | shaft of the lamp | ramp of the ultraviolet irradiation device carrying the lamp | ramp which provided the IC tag. It is a conceptual diagram which shows the structural example of the ultraviolet irradiation device shown in FIG.

Explanation of symbols

1 lamp (excimer lamp)
DESCRIPTION OF SYMBOLS 1a IC tag 2 Lighting power source 3 Transformer 4 Control part 5 Input part 4a Total lighting time update means 4b Target power calculation means 4c Correction power calculation means 4d Reference illuminance acquisition means 4e Lighting control means 4f Calibration means 4g Integration timer 10 Light source device 11 CPU
12 IC tag R / W unit 13 Storage unit 13a Memory (RAM)
13b Memory (ROM)
13c memory (EEPROM)
14 Antenna 15 Optical sensor 16a, 16b A / D converter 17 D / A converter

Claims (6)

A lighting control method for a light source device, comprising: a means for reading / writing information from an IC tag provided in a light source; a detecting means for detecting illuminance of light emitted from the light source; and a controller for controlling lighting of the light source. There,
The IC tag records, at least, specific illuminance data relating to the illuminance of light emitted from the light source when the light source is lit at a predetermined reference power, and the total lighting time of the light source. Department
Based on the specific illuminance data read from the IC tag of the light source and the set target illuminance data, obtain target power data necessary to obtain the target illuminance data,
The light source is turned on based on target power data, the illuminance of light emitted from the light source at that time is detected by the detection means, and the detected illuminance is recorded as reference illuminance data,
The detection means detects the illuminance of the light source when the light source is continuously turned on based on the target power data, and the illuminance data of the light source detected by the detection means is the recorded reference illuminance. Determine if the data has fallen below a certain percentage,
Corresponding to the total lighting time of the light source obtained based on the total lighting time of the light source read from the IC tag when the illuminance data of the light source decreased below a predetermined ratio with respect to the recorded reference illuminance data Find corrected power data,
A lighting control method for a light source device, wherein the target power data is corrected based on the corrected power data, and the light source is turned on based on the corrected target power data. When the target power data is corrected and the light source is turned on based on the corrected target power data, the illuminance of light emitted from the light source measured by the detection means is recorded as new reference illuminance data. ,
2. The lighting control method of the light source device according to claim 1, wherein it is determined whether or not the illuminance data of the light source detected by the detection unit has decreased to a predetermined ratio or less with respect to the new reference illuminance data. . In the IC tag, as the specific illuminance data relating to the illuminance of the light emitted from the light source provided with the IC tag, the illuminance of the light emitted from the light source when turned on with the predetermined reference power, The value measured by the calibrated detection means is recorded,
The detection means provided in the light source device is one whose sensitivity deteriorates over time,
The control unit of the light source device
When a new light source is attached to the light source device, the light source is turned on with the reference power, and the illuminance of the light emitted from the light source is measured by the detection means provided in the light source device,
Based on the illuminance data measured by the detection means provided in the light source device and the specific illuminance data read from the IC tag, a calibration parameter for calibrating the measurement value of the detection means provided in the light source device is obtained. 3. The light source device lighting control method according to claim 1, wherein the output of the detection means is corrected based on the calibration parameter. A light source device comprising information reading / writing means from an IC tag provided in a light source, detection means for detecting the illuminance of light emitted from the light source, and a control unit for controlling lighting of the light source,
The IC tag records, at least, specific illuminance data relating to the illuminance of light emitted from the light source when the light source is lit at a predetermined reference power, and the total lighting time of the light source. Department
Target power data calculation means for obtaining target power data necessary for obtaining the target illuminance data based on the specific illuminance data read from the IC tag of the light source and the set target illuminance data;
Reference illuminance data acquisition means for lighting the light source based on the target power data, and recording illuminance data of light emitted from the light source detected by the detection means at that time as reference illuminance data in a storage unit;
It is determined whether the illuminance of the light source detected by the detection means when the light source is continuously turned on based on the target power data has decreased below a predetermined ratio with respect to the reference illuminance data. Corresponds to the total lighting time of the light source determined based on the total lighting time of the light source read from the IC tag when it is determined that the illuminance data has fallen below a predetermined ratio with respect to the recorded reference illuminance data Corrected power calculation means for obtaining corrected power data and correcting the target power data based on the corrected power data;
A light source device comprising lighting control means for controlling the corrected target power to be supplied to the light source. In the IC tag, as the specific illuminance data relating to the illuminance of the light emitted from the light source provided with the IC tag, the illuminance of the light emitted from the light source when turned on with the predetermined reference power, The value measured by the calibrated detection means is recorded,
The detection means provided in the light source device is one whose sensitivity deteriorates over time,
The control unit of the light source device includes calibration means for the detection means,
The calibration means turns on the light source with the reference power when a new light source is attached to the light source device, and detects the light emitted from the light source detected by the detection means provided in the light source device. Based on the illuminance and the specific illuminance data read from the IC tag, a calibration parameter for calibrating the measurement value of the detection means provided in the light source device is obtained, and the output of the detection means is corrected based on the calibration parameter. The light source device according to claim 4. A light source to which an IC tag is attached,
When the light source is turned on with a predetermined reference power as the total lighting time of the light source and specific illuminance data relating to the illuminance of light emitted from the light source provided with the IC tag, A light source to which an IC tag is attached, wherein the illuminance of light emitted from the light source measured by a calibrated detection means is recorded.

Images