JP2001351580A - Short arc xenon lamp device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a short arc xenon lamp device used by a dentist or the like when setting photosensitive resin, settable in a short time without causing distortion even if an adhesive is thick, and miniaturizing the whole device. SOLUTION: This short arc xenon lamp device has a direct current lighting short arc xenon lamp disposed at a center axis in the optical axis direction of a reflecting mirror, and the lighting time of the short arc xenon lamp at a time is less than thirty seconds. In this structure, when arc length is L (mm), a lamp current is I (A), lamp power is P (W), lamp internal volume is V (ml), the charging pressure at the ordinary temperature of xenon gas is P (Atm) and the cross-sectional area of charged foil is S (mm2), the short arc xenon lamp is constituted to satisfy L/P<=0.01, P/V>=200, 3×10-3<=S/I<=1.4×10-2 and P>=5.

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, as a short arc xenon lamp device used, for example, when a dentist cures a photosensitive resin or a dental technician or the like, as shown in FIG. 3, a reflecting mirror having an inner surface having a spheroidal surface is used. Primary focus of 1 central axis 8mm
The tip of the cathode 2 of the short arc xenon lamp of 300 watts is fixed so as to be located in the vicinity, the light from the short arc xenon lamp is guided by a fiber, and the photosensitive resin is cured by an irradiator at the fiber tip.

[0003]

The reflecting mirror used in the short arc xenon lamp apparatus shown in FIG. 3 has a silver film on the inner surface, and therefore has a total reflection characteristic including a heat ray on a spectral basis. Therefore, if the irradiation is performed for more than several seconds beyond the predetermined time, the skin in the cavity of the patient may be thermally damaged. Therefore, it was necessary to cure the resin early. In order to reduce thermal damage, a multilayer film is deposited on the inner surface of the glass reflector as shown in FIG. 4, and a light emitting portion is fixed near the primary focus in the optical axis direction of a so-called cold mirror 5 that transmits heat rays backward. The resulting short-arc xenon lamp 6 of 300 W has a bulging portion of a light emitting portion of about φ25 mm. Since the short arc xenon lamp is large in size, the primary focal length is about 200 mm so that the optical position can be adjusted without contacting the lower part of the reflector and the lamp.
There is a disadvantage that a large distance is required and the entire device becomes large. Further, the short arc xenon lamp shown in FIG. 3 is designed with a wall load and an electrode designed to operate stably for a long time and continuously, and is not designed to expect a short time of several seconds to several tens of seconds. Therefore, the temperature of the inner surface of the lamp rises slowly, so that the xenon gas pressure does not rise sufficiently, and the integrated light amount for a short time immediately after lighting is small.

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 in the optical axis direction of a reflecting mirror has been implemented. It takes a long time of about 90 seconds to cure the photosensitive resin. For example, when the photosensitive resin is thick, there is a disadvantage that the resin is distorted by heat due to the long-time irradiation.

The present invention has been made in view of the above points, and even when the photosensitive resin is thick, it can be cured in a short time without causing distortion by increasing the short-time integrated light amount. It is an object of the present invention to provide a short arc xenon lamp device capable of reducing the size of the entire device.

[0006]

The present invention solves the above-mentioned problems.
The following configuration is used for this purpose. In other words, the direction of the optical axis
DC lighting short arc xeno arranged at the center
Shows with lamps and lighting time of less than 30 seconds
It relates to a torch xenon lamp device. Also short
Kuxenon lamps have an arc length of L (mm)
Current is I (A), lamp power is Pl (W), lamp content
The product is V (ml) and the sealing pressure of xenon gas at room temperature is P
(Atm), the cross-sectional area of the enclosing foil is S (mm^Two)
L / Pl ≦ 0.01, Pl / V ≧ 200, 3 × 10
^-3≦ S / I ≦ 1.4 × 10 ^-2And configure as P ≧ 5
is there.

According to a second aspect of the present invention, in the short arc xenon lamp device according to the first aspect, the seal-off portion is provided at a position other than above the gravity.

According to a third aspect of the present invention, in the short arc xenon lamp device according to the first and second aspects, the inner surface of the reflecting mirror is configured as a spheroid.

According to the first aspect of the present invention, since the photosensitive resin can be cured by a high-intensity light beam in a short time immediately after lighting, even if the resin to be cured is thick, it can be cured without causing distortion due to heat. Can cure in time.
In addition, since the short arc xenon lamp can be formed in a small size, the reflector used together can also be made small, so that the whole apparatus can be made small.

According to the second aspect of the present invention, since the seal-off portion is located so as to avoid the upper portion where the temperature rise rate is high, the seal-off portion does not burst due to thermal stress during lighting.

According to the third aspect of the present invention, the entire apparatus can be configured simply and compactly. That is, if the inner surface of the reflecting mirror is a spheroidal surface, the light is condensed at the secondary focal position, and light can be efficiently guided by arranging one end of the fiber in that portion. If the inner surface of the reflecting mirror is configured as a paraboloid of revolution, it is necessary to arrange a condenser lens on the optical axis and condense the light, the optical system becomes longer, the number of parts increases, and the structure becomes complicated and large.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIGS. In FIG. 1, reference numeral 11 denotes a reflecting mirror in a short arc xenon lamp device, which has, for example, an inner surface formed into a spheroidal surface and is formed, for example, from hard glass. The size of the reflecting mirror 11 is a flange outer diameter φ80.
mm, the effective diameter is 70 mm, and the primary focus is 13 mm and the secondary focus is 87 mm.

Reference numeral 20 denotes a short arc xenon lamp fixedly disposed so that a cathode tip of the lamp, which will be described later, is located near the primary focal point of the reflecting mirror 11, and is configured to focus light at a secondary focal point. It is. The light source is constituted by using, for example, a discharge lamp having a rated power of 300 watts. The short arc xenon lamp has a distance between the electrodes of 2.
0 mm, the bulge of the light emitting part is the maximum outer diameter φ15 mm, the same inner diameter φ
A xenon gas having a pressure of 11.5 mm (Atm) at room temperature is sealed as a luminescent material at 11.5 mm, the inner volume of the discharge vessel is 1 ml, and the discharge vessel is sealed. Reference numeral 21 denotes a cathode sealed to one end of a short arc xenon lamp, which is formed by shaving the tip of a φ1.0 mm mandrel to φ0.2 mm. 2
Reference numeral 2 denotes an anode sealed to the other end of the short arc xenon lamp, which is formed by shaving a 4 mm mandrel into a R2 mm only at the tip. Further, a portion to be embedded in the seal portion is machined so as to have a diameter of 0.8 mm so that cracks do not enter the seal portion. Reference numeral 23 denotes an enclosing foil sealed to both seal portions of the short arc xenon lamp. The enclosing foil has edges of 4 mm in width and 0.035 mm in thickness at both ends, and has a cross-sectional area of 0.14 mm ² , which is very sensitive to quartz. It is designed to be tightly sealed. In the figure, reference numeral 24 denotes a seal-off portion of the discharge vessel. This lamp device is turned on at 15.8 A DC by an electronic ballast, and the lamp power is 300 W.
Can be lit at the rating.

Further, the short arc xenon lamp device is set so that one lighting time is not 30 seconds in pulse mode. The time used when the dentist or the like cures the photosensitive resin depends on the light receiving sensitivity and the thickness of the resin, but can usually be set to about 5 seconds. Also, when a dental technician or the like makes a denture using a photosensitive resin, depending on the light receiving sensitivity and the thickness, if it exceeds 30 seconds, the thick photosensitive resin may be distorted.

The short arc xenon lamp is
The arc length is L (mm), the lamp current is I (A), the lamp power is Pl (W), the lamp internal volume is V (ml), the sealing pressure of the xenon gas at normal temperature is P (Atm), and the sealing foil is When the cross-sectional area is S (mm ² ), L / Pl ≦ 0.01
It is constituted as. In curing the photosensitive resin in a short time, the arc length exceeds this range, and if the arc length is increased, the short arc xenon lamp itself becomes larger,
Furthermore, the entire device for fixing the short arc xenon lamp becomes large and cannot meet the demand for downsizing.

Further, it is configured such that Pl / V ≧ 200. The reason is that if the internal volume of the lamp exceeds this range, the rise of the lamp light intensity immediately after lighting is slowed down, and the integrated light amount itself becomes small. In some cases, it may not be possible to make the lamp suitable for use as a short-arc xenon lamp that is lit for a short time. This will be described with reference to FIG. 2, for example, Pl / V = 300/1 = 300 in the present embodiment. This integrated light amount is indicated by an area shown by oblique lines rising to the right. In the case of the conventional short arc xenon lamp apparatus Pl / V = 100 shown in FIG. 3 in order to obtain the integrated light amount, the light amount rising curve is shown by a broken line 102. It does not become the integrated light amount (indicated by the oblique line rising to the left). Therefore, in the case of the material and thickness of the photosensitive resin that requires a large integrated light amount, for example, Pl / V <100, Pl / V <
The 200 lamp requires a long irradiation time, so that the resin is distorted and deformed, which is a problem.

Also, 3 × 10 ⁻³ ≦ S / I ≦ 1.4 × 10 ⁻²
There is. The cross-sectional area of the sealing foil with respect to the lamp current is 3
If it is less than × 10 ⁻³ , the enclosing foil is burned by a lamp current at the time of lighting, causing a defect. Further, when the cross-sectional area of the enclosing foil exceeds 1.4 × 10 ^-2 , the cross-sectional area of the lamp seal part becomes large, the short arc xenon lamp becomes large, and the entire apparatus for fixing the short arc xenon lamp becomes large. It cannot meet the demand for miniaturization, and additionally becomes optically inefficient.

The gas pressure at normal temperature is set to satisfy P ≧ 5. Xenon gas filling pressure at room temperature is 5 (At
If it is less than m), the arc will not be narrowed, and if a short arc xenon lamp is used fixed to a reflector, the light collection efficiency will be poor. It is necessary to increase the area. As the cross-sectional area of the enclosing foil increases, the width of the enclosing foil increases, and the cross-sectional area of the seal must be increased, and the central hole for fixing the short arc xenon lamp of the reflector must be increased accordingly. Optically inefficient.

Further, the seal-off portion 24 of the short arc xenon lamp is used so as not to be located at the upper portion during horizontal lighting. This is because, if a thermal stress is applied to the seal-off portion during lighting, the seal-off portion is more likely to be ruptured than other portions. Also, instead of the above-mentioned reflecting mirror having an inner surface of a spheroid, a reflecting mirror having an inner surface of a paraboloid of revolution and a configuration in which a condenser lens is arranged on the optical axis of the reflecting mirror may also be used as a reflecting mirror having a spheroid. Like a mirror, it can guide light, but the length of the optical system increases the size and complexity of the device.

Next, the conventional short arc xenon lamp device shown in FIG. 3 and the short arc xenon lamp device of the present invention shown in FIG. 1 are compared based on FIG. explain. As shown in FIG. 2, in the conventional short arc xenon lamp device, it takes about 150 seconds for the temperature of the lamp inner wall to become constant by lighting, so that it takes the same time as when the sealed xenon gas pressure becomes constant. Therefore, the same time as that for stabilizing the light amount is required. In contrast to the same conventional structure, the short arc xenon lamp of the present invention has a quartz tube wall temperature approaching the conventional surface temperature in approximately 15 seconds, and light intensity can be obtained soon after lighting. Therefore, the required integrated light amount is approximately one-half that of the conventional short arc xenon lamp device in the region where the photosensitive resin is substantially cured.
Only lighting time is required. Further, even when the photosensitive resin which requires a large integrated light quantity can be cured more quickly than a conventional short arc xenon lamp device, the resin is hardly distorted and does not deform. According to the experiment, with a blinking cycle of 25 seconds on and 5 minutes off,
The light intensity maintenance ratio did not cause any problem after 000 repetitions. In addition, it lights for 5 seconds, which is the actual use time,
After 50,000 repetitions of a 1 minute extinguishing blink cycle, the light intensity retention was about 80%, and good results were obtained.

The conventional short arc xenon lamp shown in FIG. 4 has a rated power of 300 W and V = 6 (m
l), L = 2 (mm) I = 16 (A) S = 0.35 (m
m ² ) and P = 8 (Atm), the bulge of the light emitting portion is as large as φ25 mm, and the short arc xenon lamp and its device are large. In comparison, in the short arc xenon lamp according to the present invention shown in FIG. 1, when the rated lamp power is 300 W, the bulging portion of the light emitting portion can be made as small as 15 mm, and the device can be made small accordingly. For example, the size of the reflecting mirror in the conventional short arc xenon lamp device shown in FIG.
Although the effective diameter is 140 mm, in the short arc xenon lamp device according to the present invention shown in FIG.
The diameter can be reduced to 80 mm, and the effective diameter can be reduced to 70 mm.

[0022]

According to the short arc xenon lamp device according to the first aspect of the present invention, as described above, the photosensitive resin can be cured by a high intensity light beam in a short time immediately after lighting, and the photosensitive resin can be cured in a short time. Since the resin can be cured, the photosensitive resin can be cured in a short time without distortion even when the photosensitive resin is thick. In addition, since the short arc xenon lamp can be formed in a small size, there is a special effect that the entire apparatus can be made compact.

According to the short arc xenon lamp device of the second aspect, there is a special effect that the seal-off portion does not burst due to thermal stress during lighting.

According to the short arc xenon lamp device according to the third aspect, there is a special effect that the entire device can be simply and small-sized.

[Brief description of the drawings]

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

FIG. 2 is a comparison diagram of rising light intensity between the present invention and a conventional structure.

FIG. 3 is a side view of a conventional short arc xenon lamp device.

FIG. 4 is a side view of a conventional short arc xenon lamp device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Reflector 20 Short arc xenon lamp 21 Cathode 22 Anode 23 Enclosure foil 24 Seal-off part

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor K. Ichiki 1-1, Ichiriyama-cho, Gyoda, Saitama

Claims (3)

[Claims] 1. A short arc xenon lamp device having a DC lighting short arc xenon lamp arranged on a central axis in a direction of an optical axis of a reflecting mirror and having a single lighting time of less than 30 seconds. Xenon lamps
The arc length is L (mm), the lamp current is I (A), the lamp power is Pl (W), the lamp internal volume is V (ml), the sealing pressure of the xenon gas at normal temperature is P (Atm), and the sealing foil is When the cross-sectional area is S (mm ² ), L / Pl ≦ 0.0
1, Pl / V ≧ 200,3 × 10 - 3 ≦ S / I ≦ 1.4 ×
10. A short arc xenon lamp device, wherein 10 ^-2 and P ≧ 5. 2. The short arc xenon lamp device according to claim 1, wherein the seal-off portion is provided at a position other than above the gravity. 3. The short arc xenon lamp device according to claim 1, wherein an inner surface of the reflecting mirror is formed as a spheroid.