JP2802480B2 - Ultraviolet flaw detection lamp with spot lighting mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet inspection lamp with a spot illumination mechanism used in a fluorescent magnetic particle inspection test method and a fluorescence penetration inspection test method.

[0002]

2. Description of the Related Art In a fluorescent magnetic particle flaw detection test method and a fluorescence penetration flaw detection test method specified in JIS standards,
At the time of flaw detection (detection of a defective part), an ultraviolet flaw detection lamp (also called "black light" by those skilled in the art) is used to excite and emit a fluorescent substance used in fluorescent magnetic powder and fluorescent penetrant. Have been.

As is well known, a typical structure of an ultraviolet flaw detector used for the above application is a metal or plastic case provided with an opening for irradiating ultraviolet light on a front surface thereof. A UV-transmitting filter made of phosphoric acid-based dark glass containing NiO or CoO, which cuts visible light and transmits UV light, is disposed behind the filter, and a mercury lamp, a metal halide lamp, a halogen lamp, a xenon lamp which emits UV light behind the filter. The light source tube is disposed so that the front end surface thereof faces the filter surface, and the light source tube is connected to a stabilizer coil type or inverter type ballast outside the case by a cable. In addition, in order to increase the efficiency of the ultraviolet light irradiated from the ultraviolet light irradiation opening, a metal funnel-shaped reflector having a hole at a central portion or near the central portion behind the ultraviolet light transmitting filter adjusts its reflection surface. In some cases, a structure is adopted in which the light source bulb is disposed so as to face the filter surface, and the light source bulb is inserted into the hole of the reflector with its tip end facing the filter surface.

[0004] In the fluorescent magnetic particle flaw detection test method and the fluorescence penetration flaw detection test method, an ultraviolet flaw detection lamp is used in a dark place.
There is a case where illumination with visible light is required in the dark place (for example, when adjusting instruments and checking the position of the inspection object and confirming the surface state). In such a case, use a flashlight. Spot lighting is on. However, the use of flashlights is complicated, and when using a hand-type UV flaw detector, both hands have an UV flaw detector and the other hand has a flashlight. For example, the method of holding an ultraviolet flaw detector (a case containing a mercury lamp) in the left hand and a small magnetizer (called "hand magna" by those skilled in the art) in the right hand Implementing the flaw detection test method becomes impossible.

Conventionally, as a technical means for solving the above-mentioned problems, there has been proposed an ultraviolet flaw detector (illuminator) with an illuminator disclosed in Japanese Utility Model Publication No. 46-23231. This lamp incorporates a filament lamp (normal light bulb) into a case containing a mercury lamp, and a filament lamp and its power supply are connected to a ballast circuit and a mercury lamp lighting circuit in the case, which is connected by a two-core cable. A structure is adopted in which a switch and a stable resistor (60Ω) are provided in parallel and connected in series to a mercury lamp.

[0006]

Problems to be Solved by the Invention
No. 231, the spotlight can be obtained by holding the case accommodating the mercury lamp in one hand and operating the filament lamp power switch attached to the case. Until the lamp discharge stabilizes (usually about 7
If the filament lamp is turned on for about 8 minutes, the filament lamp may be broken.

However, a power supply circuit for a filament lamp is incorporated in the ballast, the ballast and a case containing the mercury lamp are connected by a four-core cable, and two are used to supply power to the mercury lamp. If the two lamps are used to supply power to the filament lamp, the above disadvantage can be solved. However, as compared with the two-core cable, the four-core cable is heavy and lacks flexibility, so that the workability is reduced accordingly. A new problem arises in that the workability when carrying out the flaw detection test method in which a lamp is held and a small magnetizer is held in the right hand is extremely deteriorated.

In view of the above-mentioned problems, the present invention uses a mercury lamp, a metal halide lamp, a halogen lamp, a xenon lamp, or the like which emits ultraviolet light, which is used in a conventional ultraviolet inspection lamp, as a light source without using a filament lamp. It is an object of the present invention to provide an ultraviolet inspection lamp capable of performing spot illumination with a light beam and, of course, using a two-core cable for connection to a ballast.

[0009]

The above technical objects can be achieved by the present invention as described below. That is, according to the present invention, in a case provided with an opening for ultraviolet irradiation on the front surface, an ultraviolet transmission filter for cutting visible light and transmitting ultraviolet light is disposed facing the opening, and behind the filter. A funnel-shaped reflector having a hole in the center or the vicinity of the center is disposed with its reflection surface facing the filter surface, and a light source tube emitting ultraviolet light has a front end portion in the hole of the funnel-shaped reflector. The light source bulb is inserted into the ballast outside the case, facing the filter surface and with a slight gap between the side surface of the bulb and the edge of the hole. In the flaw detector connected by
A visible light irradiating opening is provided in the case and a shutter for opening and closing the opening is provided. Further, the visible light emitted from the light source tube is guided to the visible light irradiating opening in the case. An ultraviolet flaw detection lamp with a spot lighting mechanism, wherein a transmission tool is arranged.

As the visible light transmitting device, a known optical device such as a reflecting mirror or a light pipe is used.

The structure of the spotlight-equipped ultraviolet inspection lamp according to the present invention will be described in more detail below. The product of the present invention, except that a visible light irradiation opening is provided in the case, a shutter for opening and closing the opening is provided, and a visible light transmitting device is disposed in the case, It employs the same configuration as the conventional ultraviolet inspection lamp used in the fluorescent magnetic particle inspection test method and the fluorescence penetration inspection test method.

Therefore, as in the case of the conventional ultraviolet inspection lamp, the case is made of metal or plastics, an opening for ultraviolet irradiation is provided on the front surface of the case, and a grip is provided below the case. I have. In some cases, the case and the grip are integrally formed. It should be noted that the grip is not essential and is provided as needed.
Further, a UV-transmitting filter made of phosphoric acid-based dark glass containing NiO or CoO, which cuts visible light and transmits UV light, is disposed facing the UV irradiation opening, and this filter is 330 to 390 nm from commercially available products. Is selected.

A funnel-shaped reflector having a hole at a central portion or in the vicinity of the central portion is arranged behind the filter so that its reflection surface faces the filter surface. This reflector is usually made of an aluminum plate, and its reflection surface has a mirror finish or a hammer tone finish. A light source tube emitting ultraviolet light is inserted into the hole of the reflector with its tip end facing the filter surface. In the present invention, the light source bulb is inserted with a space of about 1 to 3 mm between the side surface and the edge of the hole. Further, it is desirable that the tube be inserted so that the vicinity of the base thereof protrudes rearward of the reflector. The light source bulb is connected to a ballast outside the case by a two-core cable. As the light source bulb, a mercury lamp, a metal halide lamp, a halogen lamp, a xenon lamp, or the like that emits ultraviolet light may be used, and all of them are commercially available. The above-mentioned ballast may be of a known yoke coil type or inverter type. There are commercially available ballasts, and they can be easily manufactured according to a conventional method.

In the present invention, the size and shape of the visible light irradiation opening provided in the case are not particularly limited, and may be adapted to the size and shape of the case itself. ~ 3cm square or 0.5 ~
It is sufficient to make the opening about 1 cm round. The position is preferably the front surface of the case, and particularly preferably below the opening for ultraviolet irradiation, from the viewpoint of operability during use and the positional relationship of the visible light transmitting device. In addition, in the visible light irradiation opening, an ultraviolet cut filter that cuts ultraviolet light and transmits visible light can be arranged as necessary, and if this filter is commercially available for a camera, it can be diverted. Good.

In the present invention, any type of shutter that opens and closes the visible light irradiation opening can be used as long as it can be opened or closed outside the case. If this is the case, as shown in the examples below, it should be selected as simple as possible.For example, a sliding door type lid is provided in the opening and the lid is slid to open or close, or It is preferable that a rotary lid is provided in the opening to open and close by rotating the lid.

In the present invention, the visible light transmitting device provided in the case may be an optical device such as a reflecting mirror, a light pipe, a prism, or the like, and the reflecting mirror is made of metal, particularly aluminum having a mirror finish or a hammer tone finish. It is preferable that the plate is processed to the required size and shape, and the optical conduit is made of a commercially available optical fiber or an aluminum plate that has been subjected to mirror finish or hammer tone finish with the required size and shape with the mirror or hammer tone finish inside. What processed into a tubular thing is preferred. Any of the visible light transmitting devices described above is disposed in the case according to the optical principle so as to guide the visible light (including ultraviolet rays) behind the reflector to the visible light irradiating opening as shown in a later embodiment.

[0017]

It is a well-known fact that light source lamps such as mercury lamps, metal halide lamps, halogen lamps, and xenon lamps, which are used as ultraviolet light sources, emit visible light together with ultraviolet light. Uses an ultraviolet transmission filter that cuts visible light and transmits ultraviolet light. By the way, JIS
According to Z 2343-1992, the ultraviolet irradiation device used for the fluorescent penetration testing method has a wavelength of 320 to 400 nm.
It is specified that the ultraviolet ray should be applied to a commercially available ultraviolet flaw detector in a range of 320 to 400 nm (usually 33 to 400 nm) by cutting visible light.
An ultraviolet light transmitting filter that transmits ultraviolet light having a wavelength of 0 to 390 nm is used.

The present invention utilizes the visible light emitted by the light source tube used as a light source of ultraviolet light together with ultraviolet light for spot illumination. That is, in the present invention, the visible light emitted from the light source bulb in the case is spaced from the side surface of the bulb and the center of the funnel-shaped reflector to the edge of the hole near the center. From the reflector, the visible light leaking to the rear is guided to the visible light irradiation opening provided in the case by the visible light transmitting tool disposed in the case, and provided in the opening. When the shutter is opened or closed, the opening is radiated from the opening to the outside of the case as spot illumination. When the tube is inserted near the base of the tube from the hole so as to protrude to the rear of the reflector, the visible light emitted near the base is also spotted outside the case in the same manner as described above. Irradiated.

When the shutter is opened, ultraviolet rays are also radiated from the visible light irradiating opening together with the visible light. This changes the amount of ultraviolet light radiated from the ultraviolet irradiating opening toward the object to be inspected. There is no. This is because the amount of light applied to the ultraviolet transmitting filter surface is always kept constant irrespective of the opening and closing of the shutter by the presence of the funnel-shaped reflector. In addition, since the spot illumination is not used (the shutter is opened) during the flaw detection by irradiating the inspected object with ultraviolet rays, if the shutter is opened, the ultraviolet light radiated toward the inspected object is supposed to be irradiated. Even if the amount changes, there is no practical problem.

It is extremely rare that spot irradiation is directed toward the human body even if ultraviolet light is irradiated from the visible light irradiation opening to the outside of the case. In addition, an object to be spot-lighted is visually observed. Since the time required for spot illumination (spot lighting time) is short, there is almost no danger that the ultraviolet rays will have an adverse effect on the human body. However, if necessary, a known ultraviolet ray filter that cuts the known ultraviolet rays into the opening and transmits visible light can be used. Can be arranged.

[0021]

The following are representative examples of the present invention. Embodiment 1 FIG. 1 is a partially omitted front view of an ultraviolet ray inspection lamp with a spot lighting mechanism according to the present invention, FIG. 2 is a partially omitted side view and partially cut away, FIG. 3 is a perspective view of a reflecting mirror, and FIG. It is a perspective exploded view of a rotary shutter. 1 to 4, reference numeral 1 denotes a case, which is manufactured by processing a metal plate into a sheet metal, and has an opening 11 for ultraviolet irradiation and an opening 12 for visible light irradiation provided on the front surface thereof. Reference numeral 2 denotes a grip, which is formed by molding a plastic material, is attached to the case 1, and the inside thereof is a commercially available two-core cable 6
Is penetrating. 3 is an ultraviolet transmission filter (D40F:
Product number: Marktech Co., Ltd.). The spectral distribution curve of the ultraviolet light transmitting filter 3 is shown in the graph of FIG. Reference numeral 4 denotes a funnel-shaped reflector, which is manufactured by processing an aluminum plate, has a hole 41 at the center thereof, and a reflection surface 42 is mirror-finished.

Reference numeral 5 denotes a light source tube emitting ultraviolet light (commercially available metal halide lamp: specification: 70 W, 95 V, 0.9 A, total luminous flux: 5000 lm, and the light emission distribution curve of this lamp is shown in the graph of FIG. 6). And funnel-shaped reflector 4
The distance between the hole 41 and the edge of the hole 41 is set to 2 mm. The light source bulb 5 that emits ultraviolet light has a base end fitted to a socket 52 and an inverter type ballast (not shown) outside the case 1 via a two-core cable 6 connected to the socket 52. Connected). In addition, the inverter type ballast used was a home-made ballast having a known structure.

Reference numeral 7 denotes a reflector used as a visible light transmitting device, which is a mirror-finished aluminum plate (Super Raster: trade name: manufactured by Sumitomo Light Metal Co., Ltd.) shown in FIG.
As shown in FIG. 2, it is arranged at a position and an angle for guiding visible light (including ultraviolet rays) behind the funnel-shaped reflector 4 to the visible light irradiation opening 12. I have. The dashed-dotted arrow in FIG. 2 indicates the path of visible light.

Reference numeral 8 denotes a rotary shutter which is used as a shutter for opening and closing the visible light irradiation opening 12, and is a cylindrical body 81 formed by molding a plastic material. A window 82 having substantially the same size and shape as the opening 12 is bored, and shafts 83 are provided on both end surfaces (see FIG. 4). And the rotary shutter 8
As shown in FIG. 2, both sides of the case 1 are positioned at a position where the side surface of the cylindrical body 81 is in contact with the opening edge of the visible light irradiation opening 12 by one of its axes 83 (one axis is shown by a dotted line in FIG. One of the shafts protrudes outwardly from the side wall of the case 1, and has a rotary knob 8 at its shaft end.
4 is attached. When the rotary knob 84 is operated to rotate the cylindrical body 18 so that the window 82 is aligned with the visible light irradiation opening 12, the opening becomes “open”, and when the opening 12 is covered at a portion other than the window 82, "Closed".

When the ultraviolet ray inspection lamp with the spot illumination mechanism of this embodiment is brought to the site where the fluorescent penetration inspection method is performed and used, the inspection operation can be performed with good operability.
When spot illumination was required, the rotary knob 84 was operated to open the rotary shutter 8, so that the spot illumination sufficient for work was obtained from the visible light irradiation opening 12. The illuminance on the irradiation surface of the spot light obtained here is measured with a portable illuminometer (3281: product number: manufactured by Yokogawa Electric Corporation).
Was 200 Lux under the condition of a distance of 30 cm from the visible light irradiation opening 12 to the irradiation surface.

It has been confirmed that ultraviolet light can be cut from the spot illumination light by mounting an ultraviolet light cut filter (shear cut filter L-42: trade name: manufactured by Kenko Co., Ltd.) on the visible light irradiation opening 12. The spectral distribution curve of this filter is shown in the graph of FIG.

Example 2 As the visible light transmitting device, the same aluminum plate as in Example 1 was processed into the dimensions and shape shown in FIG.
This light pipe 9 was replaced with the reflecting mirror 7 in the ultraviolet flaw detector with the spot illumination mechanism shown in the first embodiment. In the replacement, the upper port 91 of the optical conduit 9 faces the rear of the funnel-shaped reflector 4 and the lower port 92 faces the side surface of the cylindrical body 81 of the rotary shutter 8 so that the funnel-shaped reflector 9 is closed. Four visible light rays (including ultraviolet rays) at the rear were arranged so as to be guided to the visible light irradiation opening 12. As in the case of the first embodiment, the ultraviolet flaw detection lamp with the spot illumination mechanism of the present embodiment can perform the flaw detection work with good operability, and is visible by operating the rotary knob 84 to open the rotary shutter 8. It was confirmed that spot illumination sufficient for work could be obtained from the light beam irradiation opening. The illuminance of the spot illumination obtained here was measured under the same method and under the same conditions as in Example 1, and the result was 320 Lux.

Embodiment 3 An optical fiber light guide (8) is used as a visible light transmitting device.
26A: Product number: Sumita Optical Co., Ltd .: Specifications / multi-component glass fiber, bundle diameter 7 mm, opening angle 70
°, length about 100mm, brass connectors attached to both ends)
This optical fiber light guide is used as a reflecting mirror 7 in the ultraviolet flaw detection lamp with the spot illumination mechanism shown in the first embodiment.
Was replaced with In the replacement, the one end face of the optical fiber light guide faces the rear of the funnel-shaped reflector 4 and the other end face faces the side face of the cylindrical body 81 of the rotary shutter 8, and the funnel-shaped reflector 4 The rear visible light (including ultraviolet rays) was arranged to be guided to the visible light irradiation opening 12. As in the case of the first embodiment, the ultraviolet flaw detection lamp with the spot illumination mechanism of the present embodiment can perform the flaw detection work with good operability, and is visible by operating the rotary knob 84 to open the rotary shutter 8. It was confirmed that spot illumination sufficient for work could be obtained from the light beam irradiation opening. The illuminance of the spot lighting obtained here is calculated using the same method as in the first embodiment.
The result measured under the same conditions was 400 Lux.

[0029]

The present invention utilizes a visible light emitted by a light source tube such as a mercury lamp or a metal halide lamp used as a light source of ultraviolet light together with ultraviolet light for spot lighting. According to
It is not necessary to use a filament lamp for spot lighting, and circuits and components associated with the combination are not required, and power required for lighting the filament lamp is also unnecessary. Further, according to the present invention, the spot illumination can be performed even before the discharge of the light source tube is stabilized.・ No interruption due to ball change. Further, according to the present invention, a two-core cable can be used for connection to the ballast, so that the problem of using a four-core cable can be solved. Therefore,
It can be said that the industrial applicability of the present invention is very large.

[Brief description of the drawings]

FIG. 1 is a partially omitted front view of an ultraviolet inspection lamp with a spot illumination mechanism according to the present invention.

FIG. 2 is a partially omitted and partially cutaway side view of the ultraviolet flaw detection lamp with the spot illumination mechanism according to the present invention.

FIG. 3 is a perspective view of a reflecting mirror used in the embodiment.

FIG. 4 is an exploded perspective view of a rotary shutter used in the embodiment.

FIG. 5 is a graph showing a spectral distribution curve of the ultraviolet transmission filter used in the example.

FIG. 6 is a graph showing a light emission distribution curve of a metal halide lamp used in an example.

FIG. 7 is a graph showing a spectral distribution curve of an ultraviolet cut filter used in an example.

FIG. 8 is a perspective view of an optical conduit used in the embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Case 11 Ultraviolet irradiation opening 12 Visible light irradiation opening 2 Grips 3 Ultraviolet transmission filter 4 Funnel-shaped reflector 41 Hole 42 Reflecting surface 5 Light source bulb which emits ultraviolet light 51 Side surface 52 Socket 6 2-core cap ear cable 7 Reflecting mirror 8 Rotary shutter 81 Cylindrical body 82 Window 83 Shaft 84 Rotary knob 9 Light pipe 91 Upper port 92 Lower port

Claims (3)

(57) [Claims] 1. An ultraviolet transmitting filter which cuts visible light and transmits ultraviolet light is disposed in a case having an opening for irradiating ultraviolet light on a front surface thereof, and a central portion is provided behind the filter. A funnel-shaped reflector having a hole in the vicinity of the central portion or the center portion is disposed with its reflection surface facing the filter surface, and a light source tube for emitting ultraviolet light is provided at the tip of the filter in the hole of the funnel-shaped reflector. The light source bulb is inserted into the ballast outside the case by means of a cap ear cable, facing the surface and with a slight distance between the side of the bulb and the edge of the hole. In the connected UV inspection lamp, a visible light irradiation opening is provided in the case and a shutter for opening and closing the opening is provided, and further, the visible light emitted from the light source bulb is visible in the case. Light irradiation Supotsuto illumination arrangement with ultraviolet Sagukizuto characterized in that a visible light transmitting device for guiding the opening. 2. The visible light transmitting device is a reflecting mirror.
An ultraviolet flaw detection lamp with the spot lighting mechanism described. 3. The apparatus according to claim 1, wherein the visible light transmitting device is a light conduit.
An ultraviolet flaw detection lamp with the spot lighting mechanism described.