JPH01109657A - Tubular discharge lamp for curing - Google Patents

Abstract

PURPOSE:To dispence with a deflection plate and to enable effective and uniform radiation of light with a specified wave length of 300nm or more by applying coating of a material reflecting the light, and applying the light to a substance to be irradiated therewith. CONSTITUTION:A substantially-half face of a bulb 1 partitioned by a plane including the axial line is coated with a material 2 reflecting light having a specified wave length of 300nm or more. When the rest half face not coated with the material 2 is lighted against a substance 3 to be irradiated therewith, the light reflected against the material 2 spreads radially so that the substance is irradiated therewith. As a result, a reflection plate is unnecessary, and it is possible to flow cooling wind in the direction perpendicular to the tubular axis of the bulb so as to facilitate uniform application of the cooling wind thereto for cooling the bulb evenly, thereby stabilizing the characteristics for the uniform application, and further improving radiation intensity with the reflection effect without using a reflection plate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a curing tube discharge lamp that has excellent irradiation efficiency for light having a specific wavelength of 300 nm or more and does not require a reflector.

[Prior art and its problems]

Some of the ultraviolet or visible light with a wavelength of 300 nm or more emitted from a tube-shaped discharge lamp filled with mercury or various metals is used for various industrial purposes, such as curing resins and adhesives. Typical examples include curing, such as drying ink and paint.

By the way, a tube-shaped discharge lamp used for curing has picture electrodes arranged near both ends inside the tube-shaped bulb.

A reflector is placed behind and parallel to the bulb, and used in combination with the reflector. Therefore, cooling air is often flowed along the tube axis of the valve.

Among long valves, there is a difference in cooling effect between one end, which is first hit by fresh cooling air, and the other end, which is hit by heated cooling air, and uniform cooling is not possible.

As a result, the radiation characteristics from the tubular valve become non-uniform.
There is a problem with uneven irradiation. In addition, when a tubular bulb and a reflector are brought close together to increase the energy intensity of the irradiated surface, the bulb and reflector may come into contact, and this contact may cause an arc to discharge into the reflector, causing damage to the bulb. may occur. Furthermore, a space is required for the reflector, and it is difficult to replace the lamp.

[Purpose of the invention]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a curing tube discharge lamp that does not require a reflecting plate and can efficiently and uniformly irradiate light with a specific wavelength of 300 nm or more, which enables uniform cooling.

[Structure of the invention and its operation]

The curing tubular discharge lamp of the present invention has a tubular bulb equipped with electrodes at both ends sealed with a discharge material that emits light that the material to be treated is sensitive to, and emits light from the discharge material as it discharges. The present invention is characterized in that a coating for directing light of a specific wavelength of 3001 or more to the target substance is provided on approximately half the surface divided by a plane including the axis of the bulb.

In other words, if the half of the bulb that is not coated with a material that reflects light with a wavelength of 3001 or more is turned on toward the object to be irradiated, the light with a specific wavelength of 300rv+ or more that is reflected by the material that reflects light will not be exposed. The object to be irradiated is irradiated by spreading it radially toward the object. Therefore, the need for a reflector is eliminated, but this makes it possible for the cooling air to flow perpendicularly to the tube axis of the tubular valve, allowing fresh cooling air to uniformly hit the valve, resulting in uniform cooling. , the characteristics are stable and uniform irradiation is possible. Furthermore, there is no need for a space for a reflector, and lamps can be easily replaced. Since this has the same effect as bringing the reflector into contact with the bulb, the irradiation intensity can be increased.

〔Example〕

The present invention will be specifically described below based on embodiments shown in the drawings.

The drawing shows a tube discharge lamp with a rated input power of 400W.
Mercury is sealed in a tubular bulb 1 made of quartz glass, and an anode and a cathode (not shown) are placed facing each other near both ends inside the bulb 1. As shown in FIG. 1, substantially half of the plane divided by the plane including the axis of the bulb 1 is coated with a substance 2 that reflects light of a specific wavelength of 300 nm or more. The substance 2 that reflects light with a specific wavelength of 300 nm or more is, for example, Ta2
o, and SiO, (7) multilayer film with jJ, Ta, O, and S
io2 are coated alternately, but if these are coated in about 20 layers,
The wavelength is 300 cm or more, and 95% of the light with a specific wavelength
By changing the film thickness, etc., it is possible to create a film that has the ability to reflect the above.

It can also be a cold mirror type that allows heat rays to pass through.

FIG. 3 shows an example of the relationship between the wavelength and reflectance of the light-reflecting material 5 used in the present invention. This material 5 consists of Ta2O with a refractive index of 2.25 and SiO□ with a refractive index of 1.46.
is coated in 19 layers, with the 1st to 9th layers
The optical thickness nd (thickness x refractive index) of the layer is 90. The nd of the 10th layer is 100, and the nd of the 11th to 19th layers is 110. If such a multilayer coating is applied, light with a wavelength of 300 to 500 nm centered around 400 nm can be efficiently reflected. can be done.

As shown in FIG. 2, when the light is turned on with the surface not coated with the light-reflecting material 2 facing the irradiated surface 3, the light emitted from the arc toward the irradiated surface 3 is radial. The light is diffused and transmitted through the bulb 1, and the surface to be irradiated 3 is irradiated with uniform illuminance. Then, the light emitted from the arc in the direction of the light-reflecting material 2 is reflected by the light-reflecting material 2, where only light with a specific wavelength of 3001 or more is reflected by the light-reflecting material 2, diffused radially, and transmitted through the bulb 1. Since the irradiation surface 3 is irradiated, the irradiation intensity increases. At this time, the cooling air flows in a direction perpendicular to the tube axis of bulb 1, and bulb 1 is cooled uniformly, so the characteristics of the lamp are stabilized, the uniformity of emitted light is improved, and uneven irradiation is eliminated. do. Furthermore, lamp replacement can be performed easily.

In addition, in the present invention, as the substance 2 that reflects light of 300 nm or more, in addition to the multilayer film of T a , 0 and Sin, TiO2 and Sio2, HfO2 and 5L02 are used.
Various multilayer films such as can be used.

〔Effect of the invention〕

As explained above, in the curing tube discharge lamp of the present invention, substantially half of the bulb is coated with a substance that reflects light with a specific wavelength of 300 nm or more, and the reflected wavelength 300 nm
To provide a tube-shaped discharge lamp for curing that can efficiently and uniformly irradiate light with a specific wavelength of 300 nm or more without the need for a reflector because the object is irradiated with light of a specific wavelength of 300 nm or more. be able to.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of an embodiment of the present invention, FIG. 2 is a cross-sectional view, and FIG. 3 is a diagram showing the relationship between wavelength and reflectance of a substance that reflects light. 1... Bulb 2... Substance that reflects light 3.
・・Irradiated surface

Claims (1)

[Claims] A discharge material that emits light to which the substance to be treated is sensitive is sealed inside a tubular bulb equipped with electrodes at both ends, and light of a specific wavelength of 300 nm or more is emitted from the discharge material as the material is discharged. A tubular discharge lamp for curing, wherein a coating for directing the substance to be treated is provided on approximately half the surface divided by a plane including the axis of the bulb.