JP2002058682A - Short arc xenon lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short arc xenon lamp device which can harden a photosensitive resin in a short time without generating strain in the resin even the resin is thick, and can be minimized in size as a whole. SOLUTION: This short arc xenon lamp device 1 is lit for less than 15 seconds once. The short arc xenon lamp 11 comprises a quartz arc tube 12, on both ends of which a pair of electrodes 14, 15 are sealed up, and into which xenon gas is sealed. When the lamp power is made P1 (W), the volume inside the lamp V (ml), and sealing pressure of xenon gas P (atm), L/P1<=0.01, P1/V>=200, and P>=5, and the lamp power P1 is 100% when the lamp voltage in the initial stage of life in stable lighting time is assumed V1 (V) and the lamp power P1 is 85% when in a range 2/3V1-4/3V1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a short arc xenon lamp device.

[0002]

2. Description of the Related Art Conventionally, a short arc xenon lamp device used, for example, when a dentist cures a photosensitive resin or when a dental technician cures a photosensitive resin is shown in FIG.
There is a device as shown in FIG. This device is fixed such that the tip of a cathode 63 of a short arc xenon lamp 62 having a rating of 300 W is positioned near a primary focus of an optical axis center of a reflecting mirror 61 having an inner surface having a spheroidal surface. And irradiate from the fiber tip to cure the photosensitive resin.

[0003] The reflecting mirror used in the short arc xenon lamp apparatus shown in FIG. 6 has a silver film on its inner surface, and thus has a total reflection characteristic including heat rays on a spectral basis. Therefore, if the irradiation is performed for more than several seconds beyond the predetermined time, the skin inside the cavity of the patient is thermally damaged, and a burn may occur. Therefore, it is necessary to cure the resin early. Also,
The xenon lamp is designed with a wall load and electrodes assuming that it will be stably lit continuously for a long time. But,
Since the lamp is not designed for short-time lighting of several seconds to several tens of seconds, the temperature of the inner surface of the lamp rises slowly. It has become.

[0004]

Further, in order to reduce thermal damage, a multilayer film 72 is deposited on the inner surface of a glass reflecting mirror 71 as shown in FIG. 7, and a cold mirror which transmits heat rays backward is used. A 300 W short arc xenon lamp 73 has been proposed. A light emitting portion is fixed near the primary focus in the optical axis direction of the cold mirror, and the light emitting portion is approximately φ2.
It has a bulge of 5 mm. Because this lamp is large in size, the primary focal length is about 200 so that the bottom of the reflector and the lamp do not come into contact with each other and can be optically adjusted.
There is a drawback that a long distance of mm is required, and the entire device becomes large.

On the other hand, as a device used when a dentist or the like cures a photosensitive resin, a device having a structure in which a halogen lamp is fixed to a central portion of a reflecting mirror in an optical axis direction has been implemented. However, it takes a long time of about 90 seconds to cure the photosensitive resin due to its light emitting characteristics, and when the photosensitive resin is thick, there is a drawback that the resin is distorted by heat due to the long-time irradiation.

The present invention has been made in view of the above, and even when the photosensitive resin is thick, it is possible to cure the resin in a short time without causing distortion in the resin by increasing the integrated light amount in a short time. It is another object of the present invention to provide a short arc xenon lamp device capable of reducing the size of the entire device. Furthermore, even in the case of photosensitive resin curing in which irradiation for 3 seconds and turning off for 0.5 seconds are repeated tens of times for orthodontic use, there is no difference in the degree of curing of the photosensitive resin between initial irradiation and final irradiation. It is an object to provide a device having the following.

[0007]

In order to achieve the above object, a short arc xenon lamp device according to the present invention has a single turn-on time of less than 15 seconds, and a short arc xenon lamp is provided by a quartz arc tube. , A pair of electrodes are sealed at both ends, and xenon gas is sealed inside,
When the arc length is L (mm), the lamp power is Pl (W), the internal volume of the lamp is V (ml), and the xenon gas filling pressure at room temperature is P (atm), L / Pl ≤ 0.01, P
l / V ≧ 200, P ≧ 5, and 100 when the lamp voltage at the beginning of the life when the lamp is stably operated is Vl (V).
% Of the lamp power Pl, and in a range of 2/3 Vl to 4/3 Vl, the lamp power Pl is set to 85% or more by using a constant power electronic ballast.

[0008] According to the above configuration, the photosensitive resin can be cured based on high-intensity visible light in a short time immediately after lighting. In addition, even in the case of repeated use such as turning on for a short time and turning off for a short time, the irradiation intensity in the initial lighting and the final lighting is almost constant, so that even when the resin to be cured is thick, it does not cause distortion due to heat. Can be cured in a short time. Furthermore, even in the case of irradiating and hardening several tens of points each for about one second intermittently, irradiation can be performed with almost the same intensity in the initial irradiation and the final irradiation. further,
Since the short arc xenon lamp can be manufactured in a small size, the reflecting mirror can also be made small, so that the entire apparatus can be made compact.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a short arc xenon lamp device, which includes a short arc xenon lamp 11 and a reflecting mirror 21. Short arc xenon lamp 1
Reference numeral 1 denotes a quartz arc tube 12 having sealing portions 13a at both ends.
13b, and the anode 14 and the cathode 1 are formed through the sealing portion.
5 is sealed. The bulging portion of the light emitting portion of the arc tube 12 has a maximum outer diameter of 15 mm, an inner diameter of 11.5 mm, an inner volume V of 1 ml, a distance L between the two electrodes of 2.0 mm, and a pressure of 8 atm (atm) at room temperature in the tube. ) Is sealed as a light-emitting substance, and is configured as a lamp having a rated power of Pl300W.

The anode 14 sealed to one end of the xenon lamp 11 is formed by shaving a 4 mm mandrel to R2 mm only at the tip. Further, the cathode 15 sealed to the other end of the lamp, the tip of a mandrel of φ1.0 mm is φ0.2 mm.
It is configured by shaving. Further, a portion to be embedded in the sealing portion is shaved to 0.8 mm to prevent cracks from occurring in the sealing portion.

The hard glass reflecting mirror 21 has an inner surface formed as a spheroid 22. The design dimensions of the reflector are as follows: the outer diameter of the flange 24 on the opening 23 side is φ80 mm, the effective diameter is φ70 mm, and the primary focus of the reflector is 13 m.
m, the secondary focus is set to a small design value of 87 mm.
The xenon lamp 11 is located near the primary focus of the reflecting mirror 21.
The base 16 fixed to the sealing portion 13a on the anode 14 side with an adhesive 31 is fixed to the neck 25 of the reflecting mirror so that the tip of the cathode 15 is positioned. Then, the light emitted from the lamp is configured to be focused on the secondary focus.

The short arc xenon lamp device 1
Means that when the rated lamp voltage is 18 V, the rated lamp power is 300 W
0% lighting, lamp voltage during lighting from 12V to 24
In the case of V, the lamp power is controlled to be 85% or more and 255 W or more.

The xenon lamp device 1 is set so that one lighting time is not in the pulse mode, but less than 15 seconds. This is designed so that the mode can be selected for orthodontics, such as an irradiation time of 1 second and a light-off time of 0.5 seconds. When a dentist or the like cures a photosensitive resin, its use time is influenced by the light receiving sensitivity and the thickness of the resin, but is usually set to about 5 seconds. Furthermore, when a dental technician or the like makes a denture using a photosensitive resin, depending on the light receiving sensitivity and thickness, if the curing time exceeds 15 seconds, the photosensitive resin may be distorted. Is done.

The short arc xenon lamp has an arc length of L (mm), a lamp power of Pl (W), a lamp internal volume of V (ml), and a sealed pressure of xenon gas at normal temperature of P (atm). At this time, it is defined that L / Pl ≦ 0.01. This is because when the relationship between the lamp power Pl and the arc length L exceeds this range in curing the photosensitive resin in a short period of time, the arc length increases, and the short arc xenon lamp itself increases. This is because the size of the entire apparatus becomes large, and the demand for miniaturization cannot be satisfied.

Further, it is defined that Pl / V ≧ 200.
This is because if the relationship between the lamp power Pl and the lamp internal volume V is smaller than this range, the rise of the light intensity immediately after the lamp is turned on becomes slow, and the integrated light amount becomes small. For this reason, if the lighting time for one time is less than 15 seconds, the photosensitive resin may not be completely cured in some cases, and is not suitable as a short arc xenon lamp that is lighted for a short time.

Next, the reason will be described with reference to FIG.
The horizontal axis in FIG. 2 indicates the lamp rise time (second), and the vertical axis indicates the relative light amount (%) of the lamp. Pl / V of the above embodiment is 30
0, and this light quantity rising curve is shown by a solid line a. Also,
The integrated light amount is indicated by an area A with an oblique line on the upper right. on the other hand,
The conventional short arc xenon lamp shown in FIG. 6 requires Pl / V = 100 to obtain the same integrated light quantity as described above.
As shown by the solid line b in the light amount rising curve in the case of (1), since the rising time is slow, the integrated light amount (indicated by the diagonal line B of the left ascending line) will not be the same unless it is turned on for about 9 seconds. Therefore,
In the case of a photosensitive resin that requires a large integrated light amount, the conventional lamps of Pl / V = 100 and Pl / V <200 require a long irradiation time, so that there is a problem that the resin is distorted and deformed. The lighting device of the experimental example uses a constant current type electronic ballast having a rated current of 15.8 A.

Further, the sealing pressure P of xenon gas at normal temperature
≧ 5 (atm). If the pressure of the filled gas is less than 5 atm, the arc during the operation of the lamp is not narrowed, and the light-collecting efficiency of the device is significantly deteriorated. Therefore, the rated lamp power cannot be obtained unless the lamp current is increased, and it is necessary to increase the cross-sectional area of the molybdenum foil at the sealing portion to cope with the large current. When the cross-sectional area of the enclosing foil increases,
It is necessary to increase the width of the foil, and the cross-sectional area of the sealing portion must be increased. In addition, the central hole for fixing the lamp of the reflector needs to be large, which is optically inefficient.

As described above, FIG. 2 is a characteristic diagram when the lamp is lit by the constant current type electronic ballast, and the lamp rising characteristic is superior to the conventional example. However, as an orthodontic appliance for another use, the rise time of the second few seconds in the initial stage of lighting is slow, and there is a slight anxiety about the degree of curing of the photosensitive resin.

Therefore, a constant power type electronic ballast having an initial lamp current of about 20 A is used as an electronic ballast for a rated power of 300 W. When the rated lamp voltage is 18 V, the lamp power is 100% of 300 W. In the case where the lamp voltage is 12 V to 24 V, a ballast having a control function such that the lamp power becomes 85% or more is used.

Next, the input characteristics are shown in FIG. In FIG. 3, the horizontal axis indicates the ratio based on the lamp voltage and the rated lamp voltage of 18V. The vertical axis is lamp power 3
It is a relative value (%) based on 00W. The solid line shows the correlation curve of the constant current type electronic ballast, and the broken line shows the correlation curve of the constant power type electronic ballast. As can be seen from the figure, in the case of the constant power electronic ballast, the relative value of the lamp power changes with the peak of the lamp voltage 18V.

FIG. 4 is a diagram showing the relationship between the rise time of the lamp and the relative light amount, similar to FIG. The solid line a shows the case of a constant current type electronic ballast, and the broken line c shows the case of using a constant power type electronic ballast. As shown by the broken line c, more excellent rising characteristics can be obtained. This is because when the lamp voltage at the time of initial lighting is low, the lamp current is increased to give a constant power characteristic, so that the rise of the lamp light amount can be hastened.

Next, a lamp life test will be described.
As the lamp lighting time elapses, the tip of the cathode of the arc tube is worn out, the arc length is slightly increased, and tends to be higher than the initial lamp voltage. However, if a ballast having the function of setting the lamp power Pl to 85% or more is used, no problem occurs in the rising characteristic of the light amount during the lamp life. And the practical use time 5
Flashing cycle of 1 second on, 1 minute off, 50,000
Even after the repetitive lighting, the light intensity maintenance ratio was about 80%, and good results were obtained.

FIG. 5 shows an example of the above-mentioned constant power electronic ballast.
Is shown as a circuit block diagram. In the figure, an active filter rectifies an AC input and outputs a constant voltage DC.
The DC / DC converter unit makes the output power (lamp power) constant by PWM control, using a calculation result of the output voltage and the output current as a feedback signal. The starting circuit is for generating a high voltage pulse for starting the discharge of the lamp.

[0024]

As described above, the short arc xenon lamp device according to the present invention can harden a photosensitive resin by high intensity light in a short time immediately after lighting, and Can be cured, so that even when the photosensitive resin is thick, it can be cured in a short time without causing distortion. In addition, since there is no difference between the initial curing and the final curing, a sufficient degree of curing can be obtained, so that it can be used for orthodontic applications. Furthermore, since the short arc xenon lamp can be reduced in size, there is an advantage that the device combined with the reflector can also be reduced in size.

[Brief description of the drawings]

FIG. 1 is a side view showing a short arc xenon lamp device according to an embodiment of the present invention.

FIG. 2 is a diagram showing the light intensity rise characteristics of the device according to the present invention and the conventional device.

FIG. 3 is a diagram showing input characteristics of a constant power electronic ballast and a constant current electronic ballast according to the present invention.

FIG. 4 is a diagram showing a light intensity rising characteristic of an example according to the present invention.

FIG. 5 is a circuit block diagram of a constant power electronic ballast according to the present invention.

FIG. 6 is a side view of a conventional short arc xenon lamp device.

FIG. 7 is a side view of the conventional short arc xenon lamp device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Short arc xenon lamp apparatus 11 Short arc xenon lamp 12 Arc tube 13a, 13b Sealing part 14 Anode 15 Cathode 16 Base 21 Reflector 22 Spheroid 23 Opening 24 Flange 25 Neck 31 Adhesive

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor K. Ichiki 1-1.

Claims (2)

[Claims] 1. A short arc xenon lamp device in which one turn-on time is less than 15 seconds, the short arc xenon lamp is composed of a quartz arc tube, a pair of electrodes is sealed at both ends, and a xenon gas is contained inside. Is enclosed,
When the arc length is L (mm), the lamp power is Pl (W), the internal volume of the lamp is V (ml), and the xenon gas filling pressure at room temperature is P (atm), L / Pl ≤ 0.01, P
1 / V ≧ 200 and P ≧ 5, and 100% when the lamp voltage at the beginning of the life at the time of stable lamp operation is Vl (V)
A short arc for direct current lighting characterized by lighting using a constant power electronic ballast, wherein the lamp power Pl is 85% or more in the range of 2/3 Vl to 4/3 Vl. Xenon lamp device. 2. A short circuit for direct current lighting according to claim 1, wherein the constant power type electronic ballast is used by blinking repeatedly with a lighting time of 5 seconds or less and a lighting time of 1 second or less. Arc Xenon lamp device.