JP3148028U - UV light - Google Patents

Abstract

An ultraviolet light having excellent portability and high ultraviolet output is provided. An ultraviolet light 1 according to the present invention includes a cylindrical case 2 having an exit window 8 formed at one end, a translucent window member 4 provided at the exit window 8, the case 2 and the window. At least one LED 7 that is disposed in a space separated by the member 9 and irradiates the window member 4 with light including ultraviolet rays, and provided on at least one surface of the window member 4, the light emitted from the LED 7 Among them, a filter film 9 is provided which transmits light of a specific wavelength including ultraviolet rays and blocks light of other wavelengths. [Selection] Figure 2

Description

  The present invention relates to an ultraviolet light used when inspecting the presence or absence of a fluorescent substance.

  Conventionally, in the fields of non-destructive testing (fluorescent penetrant testing, fluorescent magnetic particle testing, etc.) and oil leak testing, various types of ultraviolet light are used to detect the presence or absence of fluorescent substances.

For example, the ultraviolet light described in Patent Document 1 uses an ultraviolet light emitting tube as a light source. The ultraviolet light described in Patent Document 2 uses an ultraviolet LED (Light Emitting Diode) having a wavelength of 320 nm to 400 nm as a light source. Further, in any ultraviolet light, a filter for blocking light having an unnecessary wavelength may be provided in order to prevent the object to be inspected from being irradiated with light other than ultraviolet light (particularly visible light). .
Noto 3052214 JP 2004-239749 A

  However, since the ultraviolet light described in Patent Document 1 consumes a large amount of power and needs to be supplied from an outlet provided on a wall or the like, it is not suitable for outdoor use. In addition, in the ultraviolet light described in Patent Document 2, the presence or absence of a fluorescent material may not be clearly discernible because a small amount of visible light is included in the ultraviolet light emitted from the ultraviolet LED.

  Further, the filter is usually often configured as a separate member having a thickness of about 0.5 mm to 1.0 mm. Therefore, in the ultraviolet light configured by combining the ultraviolet LED and the filter member, there is a problem that the ultraviolet light irradiated from the ultraviolet LED is attenuated while passing through the filter member, and the ultraviolet output is reduced. In some cases, the surface of the protective glass covering the ultraviolet LED is coated with a paint or the like to form a film-like filter. However, with a conventional paint or the like, the film becomes thicker if an attempt is made to sufficiently block visible light. The UV output was reduced.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide an ultraviolet light having excellent portability and high ultraviolet output.

  In order to solve the above-mentioned problems, an ultraviolet light according to the present invention is a portable ultraviolet light containing a storage battery as a power source and having a cylindrical case with an exit window formed at one end. , At least one LED disposed in a space defined by the translucent window member provided in the exit window and the case and the window member, and irradiating the window member with light including ultraviolet rays And a filter film that is provided on at least one surface of the window member and transmits light of a specific wavelength including ultraviolet light among light emitted from the LED and blocks light of other wavelengths. The filter film is formed by alternately laminating at least 10 layers of low refractive index films made of silicon dioxide and high refractive index films made of hafnium dioxide.

  In the ultraviolet light, the filter film preferably blocks light having a wavelength in the range of 400 nm to 650 nm.

  According to the said structure, since LED with little power consumption is used as a light source, electric power can be supplied with storage batteries, such as a dry cell, and the ultraviolet light excellent in portability can be implement | achieved. Moreover, according to the said structure, since the light of the unnecessary wavelength irradiated from LED was interrupted | blocked with the filter film | membrane, it is not necessary to prepare another member like a filter member. Further, since the filter film composed of the low refractive index film and the high refractive index film is sufficiently thin, the necessary ultraviolet rays are not attenuated and the ultraviolet output is not lowered.

  According to the present invention, an ultraviolet light having excellent portability and high ultraviolet output can be provided.

  Hereinafter, preferred embodiments of an ultraviolet light according to the present invention will be described with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view of an ultraviolet light according to the present invention.
As shown in this figure, the ultraviolet light 1 includes a cylindrical case formed by connecting case members 2a and 2b, and a convex lens-shaped window made of O-ring 3 and translucent quartz or the like inside the cylindrical case. A member 4, a reflecting member 5 having a mirror surface 5a, and a substrate 6 having a plurality of LEDs 7 are accommodated. Further, inside the case member 2b, a switch (not shown) for switching on / off of the ultraviolet irradiation, a storage battery (not shown) for supplying power to the LED 7 when the switch is turned on (for example, a single type dry battery) ) Is housed.

  An exit window 8 for irradiating the inspection object with ultraviolet rays is provided at the end on the case member 2a side. Further, a hole 5b is formed in the mirror surface 5a of the reflecting member 5 at a position corresponding to the LED 7 so that the LED 7 protrudes toward the mirror surface 5a. And the ultraviolet-ray irradiated from LED7 is radiate | emitted suitably by the mirror surface 5a, and is radiate | emitted from the output window 8 through the window member 4. FIG.

  In the present embodiment, as the LEDs 7, 25 UV LEDs “NSPU510CS (peak wavelength: 375 nm)” manufactured by Nichia Corporation were used.

On the inner surface of the window member 4, that is, the surface on the reflecting member 5 side, a low refractive index film made of silicon dioxide (SiO ₂ ) or the like and a high refractive index film made of hafnium dioxide (HfO ₂ ) or the like are alternately arranged in 10 layers. The filter film 9 that is laminated as described above and configured to block light having a wavelength in the range of 400 nm to 650 nm is formed by vacuum deposition. The total thickness of the filter membrane 9 is about 2 to 3 μm.

  According to this filter film 9, visible light slightly contained in the ultraviolet rays irradiated from the LED 7 is blocked, and consequently, only ultraviolet rays having a wavelength of 400 nm or less are emitted from the emission window 8 of the ultraviolet light 1. become. In addition, since the light irradiated from LED7 does not include visible light having a wavelength of 650 nm or more, the filter film 9 does not need to block light having a wavelength of 650 nm or more.

  In the formation of the filter film 9, the low refractive index film and the high refractive index film are alternately laminated by 10 layers or more in order to sufficiently block unnecessary visible light. What is necessary is just to further increase the number of laminations. However, if the number of stacked layers is excessively increased and the film thickness of the entire filter film 9 is increased, sufficient ultraviolet output cannot be obtained. Therefore, the number of layers of the low refractive index film and the high refractive index film may be determined in consideration of the degree of blocking visible light and the ultraviolet output.

  FIG. 2 is a partial cross-sectional view of the ultraviolet light 1 in which the components shown in FIG. 1 are combined. FIG. 2 schematically shows the relationship between the constituent members, and does not accurately show the dimensions of the constituent members, the ratio of the dimensions of the constituent members, and the like.

  Referring to FIG. 2, a substrate 6 is arranged on the case member 2b (on the exit window 8 side) so as to align the central axis, and further a reflecting member 5, a window member 4 and an O-ring 3 are arranged thereon. ing.

  The case member 2a is screwed into the case member 2b by a screw thread (or screw groove) formed on the inner peripheral wall thereof and a screw groove (or screw thread) formed on the outer peripheral wall of the case member 2b. The cylindrical case 2 is constituted by the case members 2a and 2b. When the case member 2 a is screwed into the case member 2 b, the window member 4, the reflecting member 5, and the substrate 6 are pressed against the case member 2 b through the O-ring 3. This prevents water or the like from entering the inside of the case 2, that is, the space defined by the case 2 and the window member 4.

  As shown in FIG. 2, the LED 7 emits a small amount of visible light (white arrow in FIG. 2) as well as ultraviolet rays (black arrow in FIG. 2) to be irradiated on the inspection object. However, since visible light is blocked by the filter film 9 composed of a low refractive index film and a high refractive index film, only ultraviolet rays (black arrows) are emitted from the emission window 8 after all. Further, since the filter film 9 is sufficiently thin as about 2 to 3 μm, the ultraviolet light is attenuated when passing through the film, and the output of the ultraviolet light emitted from the emission window 8 is not lowered.

  The graph of FIG. 3 shows this easily. As shown in FIG. 3A, the light output at a wavelength of 375 nm hardly decreases even after transmission through the filter film 9. On the other hand, as shown in FIG. 3B, in the visible light region of 400 nm or more (particularly in the vicinity of 410 nm), the light output is greatly reduced by passing through the filter film 9.

  That is, according to the present invention, it is possible to effectively remove unnecessary visible light from the light emitted from the LED 7 and irradiate the inspection object with almost no attenuation of ultraviolet rays necessary for the inspection. As a result, it is possible to provide an ultraviolet light that can clearly determine the presence or absence of a fluorescent substance. Further, according to the present invention, since the LED 7 with low power consumption is used as the light source, power can be supplied by a storage battery such as a dry battery, and an ultraviolet light excellent in portability can be provided.

As mentioned above, although preferable embodiment of this invention has been described, this invention is not limited to the said structure.
For example, the window member 4 does not need to have a convex lens shape, and may have a flat plate shape or a concave lens shape according to the size of an inspection region to be irradiated with ultraviolet rays. The filter film 9 may be formed not only on the inner surface of the window member 4 but also on the outer surface (surface on the exit window 8 side) or on both the outer surface and the inner surface. However, when forming on both sides, care must be taken not to attenuate the necessary ultraviolet light.

  Moreover, in the said embodiment, although the reflection member 5 for diffusing the light of LED7 was provided, when the light irradiated from LED7 itself is fully diffused, the reflection member 5 may be abbreviate | omitted. it can.

1 is an exploded perspective view of an ultraviolet light according to the present invention. It is a fragmentary sectional view of the ultraviolet light concerning the present invention. It is the spectrum waveform of the ultraviolet-ray irradiated from the ultraviolet light which concerns on this invention, Comprising: (A) is the whole figure of the range of wavelength 350-450 nm, (B) is the elements on larger scale of (A).

Explanation of symbols

1 UV light 2 Case 3 O-ring 4 Window member 5 Reflective member 6 Substrate 7 LED
8 Output window 9 Filter membrane

Claims (2)

It is a small UV light that has a built-in storage battery as a power source and is portable.
A cylindrical case with an exit window formed at one end;
A window member having translucency provided in the exit window;
At least one LED that is disposed in a space delimited by the case and the window member and irradiates the window member with light including ultraviolet rays;
A filter film that is provided on at least one surface of the window member and transmits light of a specific wavelength including ultraviolet rays among light emitted from the LED, and includes a filter film that blocks light of other wavelengths,
The ultraviolet light, wherein the filter film is formed by alternately laminating at least 10 layers of low refractive index films made of silicon dioxide and high refractive index films made of hafnium dioxide.   The ultraviolet light according to claim 1, wherein the filter film blocks light having a wavelength in a range of 400 nm to 650 nm.

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