KR20160037056A - Ultraviolet lamp - Google Patents

Abstract

The present invention provides an ultraviolet lamp in which variations in the illuminance distribution in the circumferential direction in the longitudinal cross section are suppressed.
According to the embodiment, an inner tube 11 having an inner diameter of 13 to 17 mm and sealed at its both ends so as to have a discharge space 12 therein, and a pair of electrodes 16a and 16b An amalgam 13 containing mercury enclosed in the discharge space 12 and flare parts 15a, 15a, 15b and 15b extending from both ends, 10); 15a, 15b, and 15b, which are provided through the arc tube 10 and the space 30 and are connected to the flare portions 15a, 15a, 15b, and 15b. The second ultraviolet light, which is irradiated with the first ultraviolet light and has a wavelength longer than that of the first ultraviolet light And an outer tube (21) having a phosphor layer (20) that emits light, and the lamp input density per unit length is 0.5 to 4 W / cm.

Description

ULTRAVIOLET LAMP

The present invention relates to an ultraviolet lamp.

For example, a fluorescent lamp having a double-tube structure is disclosed in which the fluorescent material is spaced apart from a position where the fluorescent material contacts the positive or negative mercury gas.

Japanese Patent Application Laid-Open No. 10-112286

An embodiment of the present invention provides an ultraviolet lamp in which variations in the illuminance distribution in the circumferential direction in the longitudinal cross section are suppressed.

According to the embodiment of the present invention, there is provided an internal tube having an inner diameter of 13 to 17 mm and sealed at its both ends so as to have a discharge space therein, a pair of electrodes provided at both ends of the discharge space, an amalgam containing mercury And a flare part extending from both ends, the light emission tube radiating the first ultraviolet light; And an outer tube having a phosphor layer which is provided between the light emitting tube and the space and is connected to the flare section and which emits the first ultraviolet light and emits second ultraviolet light having a wavelength longer than that of the first ultraviolet light, The lamp input density per length is 0.5 to 4 W / cm.

According to the embodiments of the present invention, it is possible to provide an ultraviolet lamp in which variations in the illuminance distribution in the circumferential direction in the longitudinal cross section are suppressed.

1 (a) and 1 (b) are schematic diagrams illustrating an ultraviolet lamp according to the first embodiment.
2 is a schematic cross-sectional view illustrating an ultraviolet lamp according to the first embodiment.
3 is a schematic diagram illustrating an ultraviolet lamp according to a conventional example of the ultraviolet lamp according to the first embodiment.
4 is a view showing the illuminance distribution of the ultraviolet lamp according to the first embodiment and the ultraviolet lamp according to the conventional example.
5 is a schematic diagram illustrating an ultraviolet lamp according to the second embodiment.
6 is a schematic diagram illustrating an ultraviolet lamp according to the third embodiment.

The ultraviolet lamps 110, 120, and 130 according to the embodiments to be described below have an internal tube 11 having an inner diameter of 13 to 17 mm and sealed at both ends so as to have a discharge space 12 therein, An amalgam 13 including mercury enclosed in the discharge space 12 and a pair of electrodes 16a and 16b provided at both ends of the flare part 15a, 15a, 15b and 15b An arc tube 10 for emitting the first ultraviolet light; 15a, 15b, and 15b, which are disposed through the arc tube 10 and the space 3 and are connected to the flare portions 15a, 15a, 15b, and 15b. The second ultraviolet light And an outer tube (21) having a phosphor layer (20) that emits light, and the lamp input density per unit length is 0.5 to 4 W / cm.

In the ultraviolet lamps 110, 120, and 130 according to the embodiments described below, the amount of mercury enclosed in the amalgam 13 is 0.03 to 3% by weight.

The ultraviolet lamps 110, 120, and 130 according to the embodiments described below include any one of titanium, indium, tin, bismuth, and zinc in the amalgam 13.

In the ultraviolet lamps 110, 120, and 130 according to the embodiments described below, the gas enclosed in the space 30 is filled with any one of neon, argon, nitrogen, .

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

(First Embodiment)

1 (a) and 1 (b) are schematic diagrams illustrating an ultraviolet lamp according to the first embodiment. Fig. 1 (a) illustrates the ultraviolet lamp 110. Fig. Fig. 1 (b) is an enlarged view of the wavefront A of Fig. 1 (a). 2 is a sectional view taken along the line B1-B2 in Fig. 1 (a).

As shown in Figs. 1A and 1B and Fig. 2, the ultraviolet lamp 110 according to the present embodiment includes a light emitting tube 10 and a phosphor layer 20.

In the present embodiment, an embodiment using a hot cathode discharge lamp as the arc tube 10 is illustrated.

In this example, the arc tube 10 comprises an inner tube 11. A discharge space (12) is provided inside the inner tube (11). In the discharge space 12, for example, an amalgam 13, which is an alloy of mercury, or a rare gas (not shown) is sealed.

In this example, the inner tube 11 is a straight tube. The inner tube 11 keeps the discharge space 12 airtight. The inner tube 11 is made of a material that transmits ultraviolet rays, and is made of, for example, quartz glass.

The amalgam 13 is an alloy containing mercury, and a part of the amalgam 13 melts and discharges mercury into the discharge space 12. The amalgam 13 is, for example, a tetrahedron system of mercury-tin-indium-titanium, and contains 0.3% by weight of mercury, 1.2% by weight of tin, 91.6% by weight of indium and 6.9% by weight of titanium. The amount of the amalgam 13 to be enclosed is, for example, 0.05 to 10 g. The amalgam 13 is disposed so as to be spaced apart from the first electrode 16a toward the discharge space 12 side. The composition of the amalgam 13 is not limited to the above. For example, the amalgam 13 may be formed of any one of titanium, indium, bismuth, tin and zinc, or two or more kinds of alloys in mercury, .

The rare gas is used for exciting mercury when the mercury constituting the amalgam 13 enclosed in the ultraviolet lamp 110 emits light by discharge. The rare gas is discharged by initiating discharging by exciting mercury by decreasing the starting voltage of the lamp by adding rare gas (argon), which is slightly lower than the metastable voltage of mercury, and discharging is accelerated at the start of discharging, And contributes to discharge maintenance after initiation. The pressure of the rare gas is, for example, 0.132 to 13.2 kPa (0.1 to 10 torr). The rare gas may be any one of neon, argon, and krypton, or a mixture of two or more gases.

The inner tube 11 has an encapsulation portion 14a provided at one end and an encapsulation portion 14b provided at the other end. The sealing portion 14a is provided with flare portions 15a and 15a extending from the sealing portion 14a. The sealing portion 14b is provided with flare portions 15b and 15b extending from the sealing portion 14b. In addition, a first electrode 16a is embedded in the sealing portion 14a, and a part of the first electrode 16a is embedded. A second electrode 16b is embedded in the sealing portion 14b, and a part of the second electrode 16b is embedded in the sealing portion 14b.

The same material as the inner tube 11 is used for the sealing portions 14a and 14b.

Flare portions 15a, 15a, 15b and 15b are formed extending from the sealing portions 14a and 14b. The flare parts 15a, 15a, 15b and 15b are made of the same material as the sealing part 14, that is, the same material as the inner tube 11 is used.

The first electrode 16a includes, for example, a filament 17a, lead wires 18a and 18a, and metal foils 19a and 19a.

The filament 17a is, for example, a so-called triple coil in which the coil is wound in triplicate. For example, tungsten is used as the filament 17a. In addition, an emitter (not shown) is applied to the gap of the coil of the filament 17a in order to improve the electron radioactivity. As the emitter, for example, carbonates of at least one of calcium, barium, zirconium and strontium are used.

The lead wires 18a and 18a are connected at one end to support the filament 17a and at the other end to the metal foil 19a. For example, a molybdenum rod is used for the lead wires 18a and 18a.

The metal foils 19a and 19a are buried in the sealing portion 14a and the sealing portion 14a is sealed so that the inside of the inner tube 11 is kept airtight. Lead wires 18a and 18a are connected to one ends of the metal foils 19a and 19a and outer lead wires 31a and 31a to be described later are connected to the other ends of the metal foils 19a and 19a. And the inside and outside of the inner tube 11 are electrically connected by the metal foils 19a and 19a. The linear expansion coefficients of the metal foils 19a and 19a are substantially equal to the linear expansion coefficient of the inner tube 11, for example. For example, molybdenum is used for the metal foils 19a and 19a.

The same configuration as that of the first electrode 16a is applied to the second electrode 16b (which is symmetrical with respect to the first electrode 16a, not shown). That is, the second electrode 16b includes a filament 17b, lead wires 18b and 18b, and metal foils 19b and 19b.

Thus, the arc tube 10 includes the discharge space 12 and emits the first ultraviolet ray including the mercury ray. The first ultraviolet light includes a mercury line of 253.7 nm.

The phosphor layer 20 is provided outside the inner tube 11. In this example, the wall of the inner tube 11 is provided between the discharge space 12 and the phosphor layer 20, so that the discharge space 12 and the phosphor layer 20 are separated from each other. In this example, a space 30 is additionally provided between the phosphor layer 20 and the inner tube 11. The space 30 is filled with an inert gas (for example, neon gas, argon gas, or nitrogen gas).

In this example, an outer tube 21 is provided around the inner tube 11. On the inner wall of the outer tube 21, a phosphor layer 20 is provided. For example, ozone-free quartz is used for the outer tube 21. [

The phosphor layer 20 is irradiated with the first ultraviolet light emitted from the light emitting tube 10. That is, the phosphor layer 20 absorbs at least a part of the mercury vapor line of 253.7 nm. The phosphor layer 20 emits second ultraviolet light different from the first ultraviolet light. The wavelength of the second ultraviolet light is longer than the wavelength of the first ultraviolet light. The wavelength (peak wavelength) of the second ultraviolet light is, for example, 280 nm or more and 400 nm or less. That is, the second ultraviolet light is, for example, ultraviolet light. In this example, the second ultraviolet light passes through the outer tube 21 and is emitted to the outside. In this example, since quartz having a high ultraviolet transmittance is used for the outer tube 21, the absorption of ultraviolet rays in the outer tube 21 can be suppressed, so that the illuminance of the second ultraviolet ray is high. The second ultraviolet light need not be a single wavelength ultraviolet light like the first ultraviolet light but may have a wide spectral distribution of 280 to 400 nm, for example, having a peak at 360 nm.

1 (b) illustrates the connection form of the inner tube 11, the outer tube 21, and the sealing of the outer tube 21 according to the present embodiment.

As shown in Fig. 1 (b), in the ultraviolet lamp 110, the outer tube 21 has outer tube sealing portions 21c and 21d. The outer tubular sealing portions 21c and 21d are formed by sealing the outer tube 21 with flare portions 15a, 15a, 15b and 15b formed extending from the sealing portions 14a and 14b of the inner tube 11 .

At least one of neon gas, argon gas, and nitrogen gas, or two or more kinds of mixed gas is filled in space 30 at 97.1. Or more. Further, it is preferable that the gas enclosed in the space 30 has a thermal conductivity of 0.016 W / (mK) or more.

The external lead wires 31a and 31a supply electric power to the inner tube 11 provided in the outer tube 21 from the outside of the ultraviolet lamp 110. [ One ends of the external lead wires 31a and 31a are connected to the metal foils 19a and 19a. The other ends of the outer lead wires 31a and 31a are exposed to the outside of the outer tube 21. [ For example, molybdenum is used for the external lead wires 31a and 31a.

As described above, the ultraviolet lamp 110 according to the present embodiment has a double pipe structure. In the double pipe structure, the outer tube 21 is provided outside the arc tube 10, which is an inner tube. A phosphor layer 20 is provided at a position other than the discharge space of the arc tube 10. [ The periphery of the inner tube 11 is sealed with, for example, neon gas or the like.

An ultraviolet lamp is used, for example, in a manufacturing process of a liquid crystal panel. In the curing step in the manufacturing process, light (for example, ultraviolet rays) emitted from an ultraviolet lamp is irradiated on the processed body. The light intensity of this light is, for example, 1 mJ or more and 10,000 mJ or less, and the wavelength of light (for example, peak wavelength) is, for example, 300 nm or more and 400 nm or less. A liquid crystal panel is produced by irradiating such ultraviolet rays to a material to be a member included in the liquid crystal panel, for example, a UV curable resin or a polymerization initiator to cure the material or polymerize the molecules.

Here, the inner tube 11 of the thermostatic ultraviolet lamp 110 preferably has an inner diameter of 13 to 17 mm. This is because when the inner diameter of the inner tube 11 is in the range of 13 to 17 mm when the arc tube 10 is turned on in the range of the lamp input density (W / cm) per unit length of 0.5 to 4, Can be arranged in a desired range, and the emission intensity of ultraviolet light can be appropriately maintained.

The input density (W / cm) per unit length of the thermionic ultraviolet lamp 110 is preferably in the range of 0.5 to 4. If the input density per unit length is less than 0.5 W / cm, the ultraviolet illuminance is lowered, which is undesirable. On the other hand, if the input density per unit length exceeds 4 W / cm, the radiant heat from the light bulb (not shown) generated in the arc tube 10 when the arc tube 10 is turned on increases, It is difficult to control the vapor pressure of the liquid. Therefore, the input density per unit length is preferably 0.5 to 4 W / cm. The term "lamp input density per unit length (W / cm)" as used herein means that the lamp power W supplied to the thermo-negative ultraviolet lamp 110 is changed from the first electrode 14a in the thermo-ultraviolet lamp 110 And the length to the second electrode 14b, that is, the distance (cm) between the electrodes.

Further, mercury is preferably enclosed as an amalgam. Even if an attempt is made to enclose mercury so as to satisfy the condition of the lamp input density of 0.5 to 4 W / cm, in order to provide the ultraviolet lamp according to the present embodiment, the influence of the radiant heat from the positive photoresist , It is difficult to control the vapor pressure of mercury because the vapor pressure of mercury is greatly higher than the desired range. Therefore, it is preferable that the mercury exists in an amalgam that can lower the vapor pressure than the mercury group.

Here, like the fluorescent lamp used in the general illumination, the fluorescent lamp is compared with the reference example in which the fluorescent layer is provided in the discharge space of the arc tube. It has been found that when the ultraviolet lamp of this embodiment and the ultraviolet lamp of the reference example are turned on at 1A, the characteristics of the phosphor layer are liable to deteriorate. This is because the current values of the present embodiment and the reference example are different from each other. A suitable current value in the reference example is about 0.8A. On the other hand, the appropriate current value in this embodiment is 1 to 4A. When the current value rises, the temperature of the discharge space rises, and for example, the phosphor is deteriorated by the applied temperature. Further, since the temperature of the discharge space rises, the mercury or the rare gas element in the excited state tends to be more likely to collide with the phosphor, so that the phosphor is deteriorated and the conversion efficiency in the phosphor is lowered. Due to these factors, the illuminance is lowered in the reference example, and it is difficult to maintain the illuminance.

As such an ultraviolet lamp that emits ultraviolet rays, a configuration in which a phosphor coated on the inner surface of a valve used in a hot-cathode fluorescent lamp for general illumination is changed to a phosphor (UV phosphor) that emits light in a wavelength range of 280 nm to 400 nm . However, it has been found by the inventor's investigation that the phosphor is liable to be deteriorated as compared with the general-purpose light-emitting phosphor in this configuration.

In this embodiment, the discharge space 12 of the arc tube 10 and the phosphor layer 20 are spaced apart from each other. Thus, deterioration in the phosphor layer 20 can be suppressed, and the maintenance ratio of the illuminance is high.

As a result of various studies by the inventors, the inner tube 11 is sealed with the outer tube 21 through the flared portions 15a, 15a, 15b, and 15b extending from the sealing portions 14a and 14b, It is possible to suppress the unevenness of the illuminance distribution of the light source. The reason for this is that the sealing of the inner tube 11 and the outer tube 21 is performed through the flare portions 15a, 15a, 15b and 15b so that the eccentricity of the longitudinal center axis of the inner tube 11 and the outer tube 21 Can be suppressed.

The first ultraviolet rays emitted from the inner tube 11 are uniformly distributed in the circumferential direction in the longitudinal cross section of the inner tube 11 and irradiated to the phosphor layer 20 provided on the outer tube 21. [ At this time, if the inner tube 11 is eccentrically sealed in the outer tube 21, even if the first ultraviolet rays emitted from the inner tube 11 are uniformly distributed in the circumferential direction in the longitudinal cross section of the inner tube 11, The first ultraviolet ray distribution irradiated to the layer 20 becomes uneven. As a result, the second ultraviolet ray emitted from the phosphor layer 20 is not uniformly illuminated in the circumferential direction in the cross section in the longitudinal direction. Therefore, the illuminance distribution in the circumferential direction on the end face in the long-side direction of the ultraviolet lamp 110 becomes uneven.

Meanwhile, the inner tube 11 and the outer tube 21 are sealed through the flared portions 15a, 15a, 15b, and 15b extending from the sealing portions 14a and 14b of the inner tube 11, The eccentricity of the central axis in the longitudinal direction of the outer tube 11 and the outer tube 21 can be suppressed, and the above problem can be suppressed.

In addition, the weight percentage of mercury in the mercury-mercury-tin-indium-titanium amalgam is preferably in the range of 0.03 to 3.0, particularly 0.3 wt%. When mercury is 0.3% by weight in the mercury-tin-indium-titanium amalgam, the ultraviolet light intensity is the highest, and the 90% relative illuminance value is obtained as compared with the ultraviolet light intensity in the range of 0.03 to 3% by weight to be. In addition, the composition of the amalgam contained in the lamp inner tube can be obtained by, for example, cooling the thermoluminescent ultraviolet lamp with liquid nitrogen, breaking the amalgam after a sufficient time, extracting the amalgam, and dissolving the amalgam in the nitric acid, Emission spectrochemical analysis apparatus). By controlling the amount of mercury contained in the amalgam to be 0.03 to 3 wt.%, It is possible to suppress unevenness of the illuminance distribution in the circumferential direction in the longitudinal cross section of the ultraviolet lamp.

The amalgam 13 is installed in the inner tube 11 of the arc tube 10 in the ultraviolet lamp 110 as shown in Fig. In addition, the amalgam 13 is bonded to the inner tube 11 by chemical interaction. This is because the titanium contained in the amalgam 13 has an influence. The titanium contained in the amalgam 13 chemically interacts with the quartz glass (SiO ₂ ) constituting the inner tube 11, so that it is chemically weakly bonded. That is, the amalgam 13 is bonded to the inner tube 11. Generally, the amalgam 13 is often installed in the coldest part of the hot cathode lamp. However, in the hot cathode lamp of the double tube as in the present embodiment, it is difficult to install the coldest part in the inner tube installed in the outer tube. If the coldest portion is provided by branching from the inner tube, it becomes difficult to seal the outer tube. In addition, unlike the case where the amalgam 13 is provided in the single pipe, when the amalgam 13 is provided in the inner pipe of the double pipe, the inner pipe is hardly affected by the temperature from the outside, Is difficult to cool. Therefore, it is difficult to intentionally install the coldest portion. In addition, if the metal such as titanium, which is easy to interact with the inner tube, is not inserted into the amalgam 13, the amalgam 13 can freely move in the inner tube, and the amalgam 13 is dispersed, When the amalgam 13 is dispersed, the intensity of ultraviolet rays due to the difference in mercury vapor pressure at the time of lamp lighting is uneven, which is not preferable. Therefore, the amalgam 13 is preferably filled with titanium or the like which is easy to interact with the inner tube. The weight percentage of titanium in the amalgam 13 is preferably 1 to 10% by weight. If the weight percentage of titanium in the amalgam 13 is less than 1.0, the strength of the amalgam 13 to bond with the inner tube 11 is weakened and the amalgam 13 moves freely. On the other hand, if the weight of the titanium in the amalgam 13 is more than 10, since the melting point of the amalgam 13 itself becomes high, the mercury vapor is released to the discharge space 12 in a small amount and the mercury vapor pressure decreases, . The metal included in the amalgam 13 is not limited to titanium and may be any metal element having a weak interaction with the quartz glass of the inner tube 12, and may be aluminum or silicon, for example. When the metal contained in the amalgam 13 is aluminum, the weight percentage in the amalgam 13 is preferably in the range of 0.5 to 3. In the case of silicon, the weight percentage in the amalgam 13 is in the range of 2 to 12 .

Since the vapor pressure of mercury contained in the amalgam 13 can be controlled by including any one of indium, tin, bismuth, and zinc in the amalgam 13, the vapor pressure of mercury contained in the amalgam 13 can be controlled, It is possible to suppress unevenness.

In addition, any of neon gas, argon gas, and nitrogen gas, or a mixture gas of two or more kinds is filled in the space 30 by 97.1. Or more. It is preferable that the gas enclosed in the space 30 has a thermal conductivity of 0.016 W / (m · K) or more. When the thermal conductivity of the gas enclosed in the space 30 is less than 0.016 W / (m · K), the heat emitted from the arc tube 10 is held in the space 30 and the temperature of the arc tube 10 rises excessively do. When the temperature of the arc tube 10 rises excessively, the vapor pressure of the mercury emitted from the amalgam 13 enclosed in the arc tube 10 excessively rises and self-absorption of ultraviolet rays by the mercury itself occurs , The illuminance decreases. Therefore, the thermal conductivity of the gas enclosed in the space 30 is preferably 0.016 W / (m · K) or more. However, even if the thermal conductivity of the gas enclosed in the space 30 is 0.016 W / (m 占 K) or more, a small atomic radius, such as, for example, helium is not preferable because the gas enters the arc tube 10. Therefore, it is preferable that the gas enclosed in the space 30 is filled with any one of neon, argon, nitrogen, or a mixture gas of two or more kinds. The pressure of the gas sealed in the space 30 is preferably at least 97.1 kPa (730 torr). If the pressure of the gas enclosed in the space 30 is less than 97.1 kPa, the heat emitted from the arc tube 10 accumulates in the space 30, and the temperature of the arc tube 10 rises excessively. If the temperature of the arc tube 10 rises excessively, the vapor pressure of the mercury emitted from the amalgam 13 enclosed in the arc tube 10 excessively increases and self-absorption of ultraviolet rays by the mercury itself occurs , The illuminance decreases. Therefore, the pressure of the gas sealed in the space 30 is preferably 97.1 kPa (730 torr) or more. Preferably, in the case where the gas enclosed in the space 30 is neon, it is not less than 730 torr and not more than 833 torr. In the case of argon, it is not less than 730 torr and not more than 813 torr. (750 torr) to 111 pounds (833 torr) or less. In the space 30, any of neon gas, argon gas, nitrogen gas, or a mixture of two or more gases is enclosed in a space of at least 97.1 kilograms (730 torr), thereby suppressing unevenness of the illuminance distribution in the circumferential direction in the longitudinal cross section of the ultraviolet lamp An ultraviolet lamp can be provided.

According to the present embodiment, it is possible to provide an ultraviolet lamp in which the unevenness of the illuminance distribution in the circumferential direction in the longitudinal cross section is suppressed.

Further, in a hot-cathode fluorescent lamp for general illumination, for example, soda lime glass or so-called lead-free soft glass is used as the material of the lamp tube. The transmittance of these materials to light with a wavelength of 300 nm is low. Therefore, in a configuration in which a phosphor used in a hot cathode fluorescent lamp for general illumination is changed to a UV phosphor, the illuminance of ultraviolet light obtained is low. When the roughness is low, for example, the time for curing in the above-described manufacturing process is prolonged and productivity is low.

In the ultraviolet lamp 110 according to the present embodiment, a high illuminance can be obtained by using a material (for example, quartz) having a high transmittance with respect to ultraviolet rays as the outer tube 21. As a result, the productivity in the manufacturing process is high.

Further, the material used for the outer tube 21 is not limited to quartz. For example, soda lime glass or so-called lead-free soft glass may be used. Any material may be used as long as it is a material that transmits the light converted by the phosphor layer 20.

Here, an ultraviolet lamp 110 according to the embodiment and an ultraviolet lamp 500 (an enlarged view of an outer tubular bag portion shown in Fig. 3) produced without providing flare portions 15a, 15a, 15b, Fig. 4 shows the results of comparison of the illuminance distribution in the circumferential direction in the cross section in the longitudinal direction. In order to obtain the comparison results shown in the following, UV-M03A manufactured by ORC manufactured by ORC was used as an illuminometer, and the UV lamps 110 and 500 were placed at a position spaced 30 mm from the center of the ultraviolet lamps 110 and 500 The vertical angle is defined as 0 ° and the illuminance measured at 45 ° in the clockwise direction is shown. The maximum value of the illuminance of each of the ultraviolet lamps 110 and 500 is normalized to 100%. The detailed specifications are as follows.

The ultraviolet lamp 110 according to the embodiment has an inner diameter of 17 mm, a length of the inner tube 11: 500 mm, and an entire length of the ultraviolet lamp 110: 600 mm.

The outer tubular sealing portion 21c is made of an elastic material such as a silicone rubber or the like and has an outer diameter of 17 mm and a length of 300 mm. The tube 21 and the stem 22c are sealed by being sealed and the stem 22c has the sealing portion 24c and the flare portion 26c. The sealing portion 24c has a pinch seal structure. The flare portion 26c is an sealing portion (sealing portion) of the outer tube 21 and the stem 22c. In the outer pipe sealing portion 21c, the end of the inner lead wires 27a and 27a of the inner pipe 11 (the end on the side not connected to the metal foils 19a and 19a) and the outer pipe metal foils 28a and 28a And external lead wires 31a and 31a. The outer tubular metal foils 28a and 28a are buried in the sealing portion 24c and sealed, thereby keeping the inside of the outer tube 21 airtight. In addition, electrical connection between the inside and the outside of the outer tube 21 is obtained by the outer tube metal foils 28a and 28a. For example, molybdenum is used for the outer tubular metal foils 28a and 28a.

4, the ultraviolet lamp 110 manufactured by installing the flare portions 15a, 15a, 15b and 15b is provided with the ultraviolet lamps 11a, 11b, 11c, The roughness distribution in the circumferential direction in the cross section in the longitudinal direction is more uniform than that in the longitudinal direction.

(Second Embodiment)

5 is a schematic cross-sectional view illustrating an ultraviolet lamp according to the second embodiment.

As shown in Fig. 5, in the ultraviolet lamp 120 according to the present embodiment, the inner tube 11 of the arc tube 10 is U-shaped. That is, the inner tube 11 includes a first portion 11a, a second portion 11b, and a third portion 11c. The first portion 11a and the second portion 11b extend along the first direction. The second portion 11b is aligned with the first portion 11a along the second direction intersecting with the first direction (orthogonal in this example). The third portion 11c connects one end of the first portion 11a and one end of the second portion 11b. In this example, the first electrode 16a is provided at the other end of the first portion 11a and the second electrode 16b is provided at the other end of the second portion 11b.

And the third portion 11c is a bent portion of the inner tube 11. [ As described above, in the embodiment, the inner tube 11 may be provided with a bent portion. The number of bent portions may be one or two or more. For example, the inner tube 11 may have an S shape or a W shape. As described above, by providing the bent portion in the inner tube 11, it becomes possible to irradiate the ultraviolet rays more widely without using a plurality of ultraviolet lamps.

The present embodiment can also provide an ultraviolet lamp in which variations in the illuminance distribution in the circumferential direction in the longitudinal cross section are suppressed.

The configuration according to the present embodiment may be applied to the ultraviolet lamp according to the first embodiment and its modifications.

(Third Embodiment)

6 is a schematic diagram illustrating an ultraviolet lamp according to the third embodiment.

As shown in Fig. 6, in the ultraviolet lamp 130 according to the present embodiment, a plurality of arc tubes 10 are provided. When each of the plurality of arc tubes 10 has a shape extending in one direction, the extending directions of each of the plurality of arc tubes 10 can be set, for example, parallel to each other. At least two of the plurality of arc tubes 10 may extend in the extending direction. As described above, by providing the plurality of arc tubes 10, it is possible to increase the amount of light as the ultraviolet lamp by using a plurality of arc tubes 10 even if the light amount of the arc tube used in the ultraviolet lamp is small.

The present embodiment can also provide an ultraviolet lamp in which variations in the illuminance distribution in the circumferential direction in the longitudinal cross section are suppressed.

The configuration according to the present embodiment may be applied to the ultraviolet lamps according to the first and second embodiments and modifications thereof.

The ultraviolet lamps 110, 120, and 130 may be ultraviolet lamps of a so-called unidirectional power feeding from one end of the external tube 21. By adopting the structure of unidirectional feeding, when power is supplied to the ultraviolet lamp, the power supply means can be arranged on one side of the ultraviolet lamp, and the space in the length direction of the ultraviolet lamp can be shortened.

Also, in the present specification, the terms "vertical" and "parallel" include not only strict vertical and strict parallelism but also deviation in the manufacturing process and the like, and may be substantially vertical and substantially parallel.

The embodiments of the present invention have been described above with reference to specific examples. However, the present invention is not limited to these specific examples. For example, with respect to the specific configuration of each element such as an arc tube, a mercury-containing portion, a tube portion, an electrode, a fluorescent layer, a conductive layer, a Kovar conductive layer, a glass plate, a housing, , And those skilled in the art can appropriately select the appropriate range from the publicly known ones, so long as the same effects can be obtained.

In addition, any combination of two or more of the embodiments in a technically feasible range is included in the scope of the present invention as long as the gist of the present invention is included.

In addition, all the ultraviolet lamps and irradiation devices that can be appropriately designed and modified by those skilled in the art based on the above-described ultraviolet lamps and irradiation devices as the embodiments of the present invention are also included in the scope of the present invention. It falls within the scope of the invention.

It is to be understood that various changes and modifications may be devised by those skilled in the art in the spirit of the present invention, and these modifications and modifications are also within the scope of the present invention.

Although several embodiments of the present invention have been described, these embodiments are provided as examples and are not intended to limit the scope of the present invention. These new embodiments can be implemented in various other forms, and various omissions, substitutions, and alterations can be made without departing from the gist of the invention. These embodiments and their modifications fall within the scope and spirit of the invention and are included in the scope of the invention as defined in the claims and their equivalents.

10: arc tube 11: inner tube
11a, 11b, 11c: first, second, third portions
12: discharge space 13: amalgam
14a, 14b: sealing parts 15a, 15b: flare part
16a: first electrode 16b: second electrode
17a, 17b: filaments 18a, 18b: inner lead wire
19a, 19b: metal foil 20: phosphor layer
21: outer tube 21c, 21d: outer tube
30: space 31a, 31b: external lead wire
110, 120, 130: ultraviolet lamp

Claims (4)

An inner tube having an inner diameter of 13 to 17 mm and sealed at both ends so as to have a discharge space therein, a pair of electrodes provided at both ends of the discharge space, an amalgam containing mercury enclosed in the discharge space, A light emitting tube having a flared portion formed to extend from the light emitting tube and radiating first ultraviolet light; And
And a phosphor layer which is provided between the light emitting tube and the space and is connected to the flare section and emits second ultraviolet light having a wavelength longer than that of the first ultraviolet light, ; And,
An ultraviolet lamp having a lamp input density of 0.5 to 4 W / cm per unit length. The method according to claim 1,
Wherein an amount of the mercury enclosed in the amalgam is 0.03 to 3 wt%. 3. The method according to claim 1 or 2,
Wherein the amalgam comprises any one of titanium, indium, tin, bismuth, and zinc. 3. The method according to claim 1 or 2,
Wherein the space is filled with at least 97.1% of any one of neon, argon, and nitrogen or a mixture of two or more gases.

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