JPH0618423A - Lighting equipment for inspection - Google Patents

Abstract

PURPOSE:To perform a highly accurate surface inspection by keeping off any transfer of a useless bar lamp projecting image and transferring the required number of bar lamp projecting images on the surface of an inspection object clearly. CONSTITUTION:This lighting equipment is provided with a bar lamp 2 and a reflector 3, and this reflector 3 consists of a back part 3a and two side parts 3b covering the back and both sides of the bar lamp 2, and a surface of the back part 3a is set down to a nonreflective surface and the side parts 3b to a mirror surface, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention projects a plurality of direct projection images or reflection indirect projection images of a rod-shaped lamp in parallel on an object to be inspected whose surface is a substantially specular reflection surface,
By visually observing the projected image of the surface of the inspection object while moving the inspection object, the sheet metal strain, coating unevenness, dirt, scratches, stains, dust, etc. on the surface of the inspection object, such as the outer surface of an automobile, are found. The present invention relates to an inspection luminaire used for the purpose.

This inspection luminaire comprises a rod-shaped lamp such as a fluorescent lamp and a reflection plate, and a plurality of inspection luminaires are arranged in parallel on the ceiling surface or wall surface of an inspection shelter in a production line.

[0003]

2. Description of the Related Art As a conventional inspection luminaire of this type, an inspection illuminator with a reflecting mirror disclosed in Japanese Patent Publication No. 2-47683 or an inspection illuminator disclosed in Japanese Utility Model Laid-Open No. 62-180757. There is a lighting device. Such an illuminating device for inspection visually observes a projected image of the surface of an inspection object such as an automobile, and thus, the surface of the inspection object, for example, sheet metal distortion, coating unevenness, dirt, scratches, stains on the outer surface of the inspection object. , It is for discovering dust and the like. for that reason,
Lighting equipment equipped with rod-shaped lamps such as straight tube discharge lamps are installed side by side on the inner wall surface of the inspection shelter.
A reflection plate is appropriately attached to the inspection shelter corresponding to each discharge lamp, and a direct projection image and a reflection indirect projection image of the rod-shaped lamp are side-by-side projected on the inspection object passing through the inside of the inspection shelter. The surface of the inspection object is inspected by determining the presence or absence of distortion or the like in the direct projection image and the reflection indirect projection image.

In such an inspection illuminating device, the illuminator and the reflector are separately attached to the inspection shelter. Therefore, when the illumination position is changed, the positions of the illuminator and the reflector should be readjusted one by one. Was required, and the installation on the inspection shelter was troublesome. From such a point, an inspection luminaire in which a reflector is integrated as shown in FIG. 24 or FIG. 25 has already been proposed.

The inspection luminaire shown in FIG.
A rod-shaped lamp 72 such as a straight tube fluorescent lamp is attached to the device main body 71, and a reflector 73 having a specular reflection surface is attached to the instrument body 71 so as to be located behind and on both sides of the rod-shaped lamp 72. The reflector 73 has a mountain shape including a back surface portion 73a located behind the rod-shaped lamp 72 and side surface portions 73b located on both sides of the rod-shaped lamp 72, and both the back surface portion 73a and the side surface portion 73b are specular reflection surfaces. .

In this inspection luminaire, direct light from the rod-shaped lamp 72 is irradiated to the front of the lamp as indicated by the arrow A ₁ , and indirect light from the reflector 73 is indicated by the arrows A ₂ and A _3. Is illuminated in front of the lamp. Therefore, when the light of this inspection luminaire is applied to the inspection object whose surface is in a substantially specular reflection state, the surface of the inspection object is irradiated with the direct light of the arrow A ₁ from the rod-shaped lamp 72. The direct projection image of the rod-shaped lamp 72 is reflected, and the reflection indirect projection image of the rod-shaped lamp 72 is reflected by irradiating the indirect light of the arrows A ₂ and A ₃ from the reflector 73 on both sides thereof. become.

That is, in this inspection lighting fixture,
With only one rod-shaped lamp 72, three rod-shaped lamp projection images will be reflected on the surface of the inspection object, and a large number of rod-shaped lamps arranged at a predetermined interval necessary for inspection with a small number of lamps. The projection image of the lamp can be imprinted, and the inspection equipment can be constructed and operated at low cost.

The inspection luminaire shown in FIG. 25 is similar to that shown in FIG.
Similar to the inspection luminaire for inspection, a rod-shaped lamp 72 such as a straight tube fluorescent lamp is attached to the main body 71 of the fixture, and a reflector plate 74 having a specular reflection surface is positioned behind and on both sides of the rod-shaped lamp 72. It is attached to the instrument body 71. The reflector 74 includes a back surface portion 74 a located behind the rod-shaped lamp 72 and side surface portions 7 located on both sides of the rod-shaped lamp 72.
4b, and each of the back surface portion 74a and the side surface portion 74b is a specular reflection surface. The side surface portion 73b of the reflection plate 74 is bent in the middle portion.

In this inspection luminaire, direct light from the rod-shaped lamp 72 is irradiated to the front of the lamp as indicated by arrow B ₁ , and indirect light from the reflector 74 is indicated by arrows B _{2 to} B _5. Is illuminated in front of the lamp. Therefore, when the light of this inspection luminaire is applied to the inspection object whose surface is in a substantially specular reflection state, the surface of the inspection object is irradiated with the direct light of arrow B ₁ from the rod-shaped lamp 72. The direct projection image of the rod-shaped lamp 72 is reflected, and the reflection indirect projection image of the rod-shaped lamp 72 is reflected by irradiating the indirect light of the arrows B _{2 to} B ₅ from the reflecting plate 74 on both sides thereof. become.

That is, in this inspection luminaire,
With only one rod-shaped lamp 72, five rod-shaped lamp projection images are reflected on the surface of the inspection object,
A large number of rod-shaped lamp projection images lined up at a predetermined interval necessary for inspection can be imprinted with a small number of lamps, and inspection equipment can be constructed and operated at low cost.

FIG. 26 is a schematic view showing an example of a mode of use of the inspection lighting fixture of FIG. 24, for example. In the state shown in FIG. 26, the inspection luminaire is arranged so that the rod-shaped lamp 72 is horizontal, and the rod-shaped lamp projection image is projected onto the automobile 75 as the inspection object. It may be in the direction. In FIG. 26,
The arrow C ₁ indicates the direct light from the rod-shaped lamp 72, and the direct projection image of the rod-shaped lamp 72 is reflected at the tip thereof. Further, arrows C ₂ and C ₃ indicate indirect light from the rod-shaped lamp 72, and the reflected indirect projection image of the rod-shaped lamp 72 is reflected at the tip thereof.

[0012]

In the inspection luminaire shown in FIG. 24 or FIG. 25, since the back surface portions 73a and 74a of the reflection plates 73 and 74 are also specular reflection surfaces, they come out of the rod lamp 72. The light is reflected, for example, by the arrows A ₄ , A ₅ or the arrows B ₆ , B ₇ on the back side 7 of the reflectors 73, 74.
3a, 74a are specularly reflected, and further the reflection plates 73, 74
Is reflected by the side surface portions 73b and 74b of the front surface of the lamp and is irradiated to the front of the lamp, or the rear surface portions 73a and 73b of the reflection plates 73 and 74,
The light is reflected specularly at 74a and is directly irradiated to the front of the lamp.

As a result, when the light of the inspection luminaire is applied to the inspection object whose surface is in a substantially specular reflection state, the surface of the inspection object is indicated by the arrow A from the rod-shaped lamp 72.
₄ , A ₅ or arrows B ₆ , B ₇ are reflected twice, and the reflected indirect projection image of the rod-shaped lamp 72 is reflected, and these arrows A ₄ , A ₅ or arrow B ₆ , B ₇ of 2
The reflected indirect projection image by the reflected light on the mirror surface is the direct projection image by the direct light of the arrow A ₁ or the arrow B ₁ or the arrows A ₂ , A
₃ or arrows B _{2 to} B ₅ are partially overlapped with the reflected indirect projection image by the specularly reflected light. That is, there is a problem in that the projection image of three or five rod-shaped lamps is reflected on the surface of the inspection object in a state in which the projection image cannot be clearly divided, and the surface inspection cannot be performed with high accuracy.

Therefore, an object of the present invention is to prevent unnecessary reflection of the projected image of the rod-shaped lamp and to clearly project the required number of projected images of the rod-shaped lamp onto the surface of the inspection object with high accuracy. An object of the present invention is to provide an inspection luminaire capable of performing a surface inspection.

[0015]

According to a first aspect of the present invention, there is provided a lighting fixture for inspection, comprising a rod-shaped lamp and a reflecting plate, the reflecting plate including a back surface portion and a side surface portion covering the back and both sides of the rod-shaped lamp, respectively. The back surface is a non-reflective surface and the side surface is a mirror surface. In the illuminating device for inspection according to the second aspect, the reflector is rotatable about the tube axis of the rod-shaped lamp.

In the inspection illuminator according to the third aspect of the present invention, the back portion and the side portion of the reflector are hingedly connected to each other so that the angle between them is variable.

[0017]

According to the structure of claim 1, there is no mirror reflection from the back surface of the reflector, and unnecessary reflection of the projected image of the rod-shaped lamp due to mirror reflection from the back surface of the reflector is prevented. The projected images of several rod-shaped lamps are clearly reflected on the surface of the inspection object.

According to the second aspect of the invention, the irradiation direction of the specularly reflected light is changed by rotating the reflection plate. By changing the angle of the reflector when the attachment position of the instrument is changed, the projection direction of the projected image of the rod-shaped lamp is optimally adjusted according to the direction of the inspection object from the attachment position of the instrument. That is, the projection direction of the projected image of the rod-shaped lamp is always adjusted to the optimum position wherever the device is attached.

According to the third aspect of the present invention, by adjusting the angle formed by the side surface portion with respect to the rear surface portion of the reflecting plate,
The interval between the direct projection image of the rod-shaped lamp by the direct light and the reflection indirect projection image of the rod-shaped lamp by the specular reflection light can be arbitrarily changed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described with reference to FIG. As shown in FIG. 1, this inspection lighting fixture has a fixture main body 1 to which a rod-shaped lamp 2 such as a straight tube fluorescent lamp is attached, and a reflector plate 3 having a specular reflection surface has a rod-shaped lamp 2.
It is attached to the instrument body 1 so as to be located behind and on both sides of the. The reflector 3 has a mountain shape including a back surface portion 3a located behind the rod-shaped lamp 2 and side surface portions 3b located on both sides of the rod-shaped lamp 2. Only the side surface portion 3b serves as a specular reflection surface, and the back surface portion 3a does not exist. It is a reflective surface. Specifically, only the side surface portion 3b of the reflection plate 3 made by bending a plate material made of iron or the like has a mirror finish such as aluminum vapor deposition, and the back surface portion 3a has a non-reflective finish such as black melamine resin coating. .

When the back surface 3a of the reflection plate 3 is black matte, the contrast between the portion of the projected image of the rod-shaped lamp and the portion where the back surface 3a is reflected is too strong on the surface of the inspection object. For example, the back surface portion 3a may be painted beige or milky white to reduce the contrast. In the above description, the meaning of making the back surface part 3a a non-reflective surface is to prevent the projected image of the rod-shaped lamp 2 from being reflected, so that processing (processing to scatter light) may be performed so as not to perform specular reflection. It is sufficient as long as it is sufficient, and it is not limited to black coating, but light-colored coating may be used. In the claims, it is expressed as "non-reflective surface" in the sense that it does not have specular reflection, and light-colored diffusion coating. Cases such as the above are also included in the scope of the claims.

In this inspection luminaire, direct light from the rod-shaped lamp 2 is irradiated to the front of the lamp as indicated by the arrow D ₁ , and indirect light from the reflector ₃ is indicated by the arrows D ₂ and D _3. Is illuminated in front of the lamp. Therefore, when the light of this inspection luminaire is applied to the inspection object whose surface is in a substantially specular reflection state, the surface of the inspection object is irradiated with the direct light of the arrow D ₁ from the rod-shaped lamp 2. The direct projection image of the rod-shaped lamp 2 is reflected, and the reflection indirect projection image of the rod-shaped lamp 2 is reflected by irradiating the indirect light of the arrows D ₂ and D ₃ from the reflector 3 on both sides thereof. become.

That is, in this inspection lighting fixture,
With only one rod-shaped lamp 2, the projection images of the three rod-shaped lamps are reflected in the state of being clearly separated on the surface of the inspection object, and with a small number of lamps at predetermined intervals necessary for inspection. It is possible to print a large number of projection images of rod-shaped lamps arranged side by side, and it is possible to construct and operate inspection equipment at low cost. In addition, the side surface portion 3b of the reflection plate 3
By changing the angle of, the interval between the direct projection image of the direct light of the arrow D _{1 and} the reflected indirect projection image of the indirect light of the arrows D ₂ and D ₃ can be changed.

Further, in the inspection luminaire of the embodiment of FIG. 1 described above, since the back surface 3a of the reflector 3 is a non-reflective surface, the light emitted from the rod-shaped lamp 2 is different from the conventional example. The rear surface 3a of the reflector 3 is specularly reflected, and the side surface 3b of the reflector 3 is specularly reflected to irradiate the front of the lamp.
Alternatively, the back surface 3a of the reflector 3 is not specularly reflected and is not directly irradiated to the front of the lamp.

Therefore, even when the light of the inspection luminaire is applied to the inspection object whose surface is in a substantially specular reflection state, the back surface 3 of the reflection plate 3 is on the surface of the inspection object.
An unnecessary reflection indirect projection image of the rod-shaped lamp 2 due to the specular reflection at a is not reflected. As a result, the three rod-shaped lamp projection images are not clearly reflected on the surface of the object to be inspected and the surface inspection can be performed with high accuracy.

In the above-described embodiment, the structure in which the specular back surface of the reflection plate 73 of the inspection lighting equipment of FIG. 24 is changed to a non-reflective surface is shown. Similarly, the reflection plate of the inspection lighting equipment of FIG. A configuration in which the rear surface of the specular reflection of 74 is changed to a non-reflection surface is also included as an example. Further, in the above-mentioned embodiment, a folded plate reflector is shown as a specific example of the reflector, but a reflector that is smoothly curved in a parabolic shape can also be used as a back surface 3a and a side surface at appropriate points on the parabola. It can be easily considered that the side surface portion 3b is a specular reflection surface and the back surface portion 3a is a non-reflection surface.

A second embodiment of the present invention will be described with reference to FIG. This inspection lighting fixture, as shown in FIG.
The reflector 4 is parabolic and the rod-shaped lamp 2 is arranged at the focal point of the parabola. The back surface 4a of the rod-shaped lamp 2 is made a non-reflective surface by applying a black melamine resin coating as in the case of the first embodiment, and the side surface portions 4b located on both sides thereof are a mirror-reflecting surface by vapor deposition of aluminum or the like. The region 4c and the region 4d, which is a non-reflective surface by applying black melamine resin coating, are alternately formed in stripes parallel to the rod-shaped lamp 2.

When the reflecting plate 4 is constructed in this manner, direct light from the rod-shaped lamp 2 is emitted to the front of the lamp as indicated by arrow E ₁ , and indirect light is emitted as indicated by arrows E ₂ and E _3. It will be irradiated in front of the lamp. As a result, five rod-shaped lamp projection images are reflected on the surface of the inspection object. The effect of this embodiment is similar to that of the first embodiment.

A third embodiment of the present invention is shown in FIGS. 3 and 4.
It will be described based on. As shown in FIG. 3, in this inspection lighting fixture, the reflector 5 has a parabolic shape and the rod-shaped lamp 2 is arranged at the focal point of the parabolic surface. The reflection plate 5 is made of an iron plate or the like, and has first and second members 5 each having two elongated openings 5c parallel to the rod-shaped lamp 2 on the side surface portions 5b on both sides of the back surface portion 5a.
A and an arrow F on the back side of the side surface portions 5b on both sides of the first member.
The second member 5B is slidably superposed in the direction ₁ (direction orthogonal to the tube axis direction of the rod-shaped lamp 2).

The first member 5A has, for example, a black melamine resin coating on its surface to make it non-reflective. The second member 5B is a region 5d that is a mirror-reflecting surface formed by vapor deposition of aluminum or the like.
Areas 5e which are non-reflective surfaces, such as black melamine resin coating, are alternately formed in stripes parallel to the rod-shaped lamp 2. The widths of the regions 5d and 5e are determined according to the width a and the interval b of the opening 5c.

The other structure is similar to that of FIG.
According to the inspection luminaire of this embodiment, by sliding the second member 5B, the width of the region 5d exposed from the opening 5c can be changed, and the rod-shaped lamp 2 by the direct light indicated by the arrow G ₁ can be changed. Although the width of the direct projected image does not change, the width of the reflected indirect projected image of the rod-shaped lamp 2 by the indirect light indicated by the arrows G ₂ and G ₃ can be arbitrarily changed.

Other effects are similar to those of the above-mentioned embodiment.
A fourth embodiment of the present invention will be described based on FIG. The inspection luminaire, as shown in FIG. 5, and a rear portion 6a and both the side portions 6b of the reflector 6 and hinged 6c, and rotatable in the direction of arrow H _1, side portion The angle of 6b can be arbitrarily changed, and other configurations are similar to those of FIG.

According to this structure, by changing the opening angle of the side surface portion 6b, the rod-shaped lamp 2 by direct light can be used.
The distance between the direct projection image and the reflection indirect projection image of the rod-shaped lamp 2 due to indirect light can be adjusted arbitrarily, and the surface shape and size of the inspection object or the distance from the rod-shaped lamp 2 to the inspection object, etc. The surface can be inspected with high accuracy by adjusting to the optimum size. Other effects are the same as those of the above-mentioned embodiment.

A fifth embodiment of the present invention will be described with reference to FIG. This inspection lighting fixture, as shown in FIG.
The rear surface portion 7a of the reflection plate 7 and the side surface portion 7b divided into two are connected by hinges 7c and 7d, which are rotatable in the directions of arrows I ₁ and I ₂ , and the angle of the side surface portion 7b is arbitrarily changed. The other configurations are the same as those in FIG.

This embodiment has the same effect as the fourth embodiment. A sixth embodiment of the present invention is shown in FIGS.
It will be described based on. As shown in FIGS. 7 and 8, this inspection luminaire includes a reflector plate 3 in the direction of an arrow J ₂ with respect to the luminaire body 1 with the tube axis J ₁ of the rod-shaped lamp 2 as the center of rotation.
Is rotatably attached. The reflector 3 is the instrument body 1
It is rotatably attached (within a range of about ± 25 °) to the reflection plate fixing plate 8 fixed to both end faces of the plate by the screw 9, and by tightening the screw 9, the reflection plate 3 can be fixed at an arbitrary angle. Has become. 10 is a lamp socket.

Other configurations are the same as those in FIG. When the reflector is rotatably configured in this manner, as shown in FIG. 9, when the inspection luminaires 12 to 15 are installed in a distributed manner on the ceiling surface and the wall surface of the inspection shelter 11, the reflector is arrowed. The irradiation direction of the specularly reflected light can be changed by rotating in the directions of the symbols K _{1 to} K ₄ . As a result,
By changing the angle of the reflection plate 3 in accordance with an arbitrary instrument attachment position or when the instrument attachment position is changed, the projection direction of the rod-shaped lamp projection image is changed from the instrument attachment position to the inspection object. It can be optimally adjusted as indicated by arrows L _{1 to} L ₄ according to the 16 directions. That is, the projection direction of the rod-shaped lamp projection image can always be adjusted to the optimum position wherever the inspection lighting fixtures 12 to 15 are attached.

The other effects are similar to those of the first embodiment. Here, specific configurations of the inspection luminaire in which the reflector 3 is configured to be rotatable around the tube axis of the rod-shaped lamp 2 as described above are shown in FIGS. 10 to 12. FIG. 10A shows a plan view of the inspection lighting fixture, and FIG. 10B shows a side view thereof.
The figure (c) has shown the front view. The same members as those in FIGS. 7 and 8 are designated by the same reference numerals. 31 is the ceiling.

FIG. 11 is a partial side view of the inspection luminaire, and FIG. 12 is a partial front view of the inspection luminaire. Figure 7
The same members as those in FIG. 8 are designated by the same reference numerals. Reference numeral 32 denotes a side plate of the instrument body 1, on which the reflection plate fixing plate 8 is integrally extended. Reference numeral 33 denotes a reflector mounting base, which is rotatably mounted on the reflector fixing plate 8 with a screw 9 about the tube axis of the rod-shaped lamp 2 as a center of rotation. It is installed in a bridged state.

Reference numeral 34 denotes a component cover which is put on the instrument body 1. Reference numeral 35 is a discharge lamp ballast. 36 is the instrument body 1
It is a reinforcing plate provided inside for ceiling mounting. Reference numeral 37 denotes a socket base to which the lamp socket 10 is fixed, which is fixed to the fixture body 1 at both ends. 38 is a decorative screw, 3
Reference numeral 9 is a component cover mounting screw. Reference numeral 40 denotes a packing, one surface of which is fixed to the reflection plate fixing plate 8 and is provided between the reflection plate mounting base 33 and the reflection plate fixing plate 8 and has a slip preventing function with respect to the rotation of the reflection plate 3.

In the above inspection lighting fixture, in order to prevent unnecessary reflection, each component other than the reflection plate 3 is coated with black melamine resin or the like. Although not shown, a hole for penetrating the lamp socket 10 is formed in the reflection plate 3, and the hole is made large so as not to impair the rotation of the reflection plate 3. A seventh embodiment of the present invention will be described with reference to FIGS. 13 and 14. This inspection illuminator is shown as a bar-shaped lamp 23, 24 arranged in front of a bent reflector 21 as shown in FIG. 13A or a parabolic reflector 22 as shown in FIG. 13B. 14 (a) to 14 (c), rod-shaped lamps 25 to 27 having masking portions 25a to 27a of a black or a ring shape or a linear shape or a combination thereof on the peripheral body of the arc tube are used. is there.

When the rod-shaped lamps 25 to 27 provided with the masking portions 25a to 27a are used as the rod-shaped lamps 23 and 24, the masking portions 25a to 27a are not formed by coating the black melamine resin on the back surface of the reflecting plate of the above-mentioned embodiment. The same effect as the formation of the reflecting surface is obtained, and a plurality of rod-shaped lamp projection images are reflected on the surface of the inspection object. As a result,
The same effect as the first embodiment can be obtained.

FIG. 15 shows the results of measuring the detection rate of abnormal portions by changing the pitch of the rod-shaped lamp projection image on the surface of the inspection object variously. The measurement result of FIG. 15 shows the result when the surface of the inspection object coated in pure white is inspected. From FIG. 15, it was found that the detection rate was highest when the pitch of the projected image of the rod-shaped lamp was 150 mm.

Further, the relationship between the light color of the rod-shaped lamp 2 and the luminance contrast was examined when the back surface 3a of the reflection plate 3 was black matte. The result is shown in FIG. Figure 1
In No. 6, the horizontal axis represents the wavelength exhibiting a peak in the spectral distribution of the rod-shaped lamp, and the vertical axis represents the brightness contrast. The term "luminance contrast" as used herein means a luminance ratio with the luminance of the rod-shaped lamp 2 itself as a numerator and the luminance of the surface of the back surface 3a of the black matte reflection plate 3 50 mm away from the rod-shaped lamp 2 as a denominator. From FIG. 16, it can be seen that a lamp having a peak wavelength in the spectral distribution of about 600 Å, that is, a white fluorescent lamp has a large brightness contrast. When a white rod-shaped lamp is used, the difference in luminance between the portion of the projected image of the rod-shaped lamp on the surface of the inspection object and the portions on both sides of the image becomes large, and it becomes easy to identify the abnormality of the surface.

Next, the illuminance, the brightness, etc. of each part when the inspection lighting fixture is installed will be described with reference to FIGS. 17 to 19. In FIG. 17, for example, the irradiation light from the inspection lighting fixture shown in FIG.
The figure shows a state in which three rod-shaped lamp projection images of the surface of the inspection object are imaged. First, the inspection luminaire is a one-lamp type that uses a white fluorescent lamp (40W).
As described above, the back surface of the reflector 3 is a non-reflective surface (black matte), and both side surfaces are specular reflective surfaces. The distance X ₁ from the rod-shaped lamp 2 to the inspection object 41 is, for example, 11
It is 00 mm.

In this inspection luminaire, broken line arrow marks M ₁ to
Direct light and reflected light are radiated like M ₃ , but the illuminance P below the inspection luminaire is, for example, 800 Lx,
Of the rod-shaped lamp projection images 42 to 44 on the surface of the inspection object 41, the luminance of the rod-shaped lamp projection image 42 by direct light is 42.
0 Cd / m, projected image 43 of a rod-shaped lamp by indirect light
Has a luminance of 340 Cd / m, and the luminance of the rod-shaped lamp projection image 42 by the direct light and the luminance of the rod-shaped lamp projection image 4 by the indirect light 4
There was no big difference with the luminance of 3 and it was about 1: 0.8, and there was no problem. The brightness of both is 1: 0.7.
There is no problem even if it is about 5. The distance X ₂ between the rod-shaped lamp projected image 42 by the direct light and the rod-shaped lamp projected image 43 by the indirect light was 150 mm.

A circuit including a high-frequency inverter device was used as a power supply device for supplying power to the inspection lighting fixture, and the output could be adjusted stepwise or continuously in the range of 50 to 100%, for example. Similar to FIG. 17, in FIG. 18, irradiation light from the inspection lighting fixture shown in FIG. 1 is applied to the surface of the inspection object, and three rod-shaped lamp projection images of the surface of the inspection object are projected. However, the opening angle of the side surface of the reflection plate 3 is changed to be narrower. In this way, if the opening angle of the reflection plate 3 is narrowed, the position of the rod-shaped lamp projected image 42 does not matter, but the rod-shaped lamp projected image 43,
The position of 44 approaches the projection image 42 of the rod-shaped lamp, and the distance X ₂ between them is reduced to 40 mm.

In FIG. 19, the back surface of the reflector 3 in FIG. 17 is not a black non-reflective surface but a white non-reflective surface (scattering surface), and a light-reducing plate 45 is arranged in front of the rod-shaped lamp 2.
Other conditions are the same as in FIG. In the case of this example, the illuminance P ₁ and the brightness Q ₂ have the same values as in FIG. 17, but the brightness Q ₁ is reduced to 340 Cd / m and becomes the same as the brightness Q _2, and the three rod-shaped lamp projected images 42 to The luminance of 44 could be made uniform.

Next, the difference between the case where the color of the back surface portion 3a of the reflector 3 is black and the case where it is milky white (beige or the like) will be described with reference to FIGS. 20 to 23, the height of the projected image schematically represents the intensity of the reflected light from the surface of the inspection object. First, when the color of the back surface portion 3a of the reflection plate 3 is black, as shown in FIG. 20, the diffused light from the back surface portion 3a is weak (arrow U ₁ ) and the back surface to the surface of the inspection object 41 is reduced. There is almost no reflection of the diffused light of the portion 3a as a projected image, and the rod-shaped lamp 2 is provided on the surface of the inspection object 41.
The direct projection image 42 and the reflection indirect projection image 43 are clearly reflected, and the contrast (luminance contrast) between the direct projection image 42 and the reflection indirect projection image 43 and the portions on both sides thereof is large. Therefore, the inspector can detect the surface abnormality only at the boundary portions between the direct projection image 42 and the reflection indirect projection image 43 and the portions on both sides thereof.

On the other hand, when the color of the back surface 3a of the reflector 3 is a light color such as milky white, as shown in FIG. 21, the diffused light from the back surface 3a of the reflector 3 becomes relatively strong (arrow). The symbol U ₂ ), the direct projection image 42 and the reflection indirect projection image 43 of the rod-shaped lamp 2 are reflected on the surface of the inspection object 41, and the reflection plate 3 is formed on both sides of the direct projection image 42 of the rod-shaped lamp 2. Since the projected image 51 of the back surface portion 3a is reflected in the reflected indirect projected images 43 and 44 and the parts on both sides thereof are maintained in a large state, the direct projected image 42 is formed.
And the contrast on both sides of it decreases. The projection image 51 on the back surface 3 a of the reflection plate 3 is the brightest image in the vicinity of the direct projection image 42, and the reflection indirect projection image 4
It becomes darker as it approaches 3 and 44, and it hardly appears in the vicinity of the reflected indirect projection images 43 and 44.

FIG. 22 is an enlarged view of the vicinity of the direct projection image 42 in FIG. 21, and dust or the like is present on the surface of the inspection object 41 where the projection image 51 of the back surface 3a of the reflection plate 3 is reflected. The foreign matter 52 is attached. Thus, the projected image 51 of the surface of the inspection object 42 is obtained.
In the portion where is reflected, the reflected light is reflected substantially uniformly as shown by the arrow S ₁ in the portion where nothing is attached, but the reflected light is shown as the arrow S ₂ in the portion where the foreign matter 52 is attached. So it becomes non-uniform.

That is, when the back surface 3a of the reflector 3 is milky white, the back surface 3a of the reflector is projected on the coating film on the surface of the inspection object 41 by the diffused light from the back surface 3a of the reflector 3. An image 51 is formed. If there is no foreign matter on the coating,
The reflected light in the projected image 51 becomes uniform, and if there is a foreign matter 52 such as dust or lumps, there are portions where the reflected light is strong and weak portions, and the foreign matter 52 can be detected even if the reflected light is uneven. Although the brightness contrast between the direct projection image 42 of the rod-shaped lamp 2 and its both sides decreases, the presence of the foreign matter 52 can be detected in the both sides of the direct projection image 42, and the detection rate as a whole can be improved. it can.

FIG. 23 shows the relationship between the coating color of the back surface 3a of the reflector 3 and the detection rate. In FIG. 23, the brightness of the reflector (N value of Munsell) is taken, and the vertical axis shows the detection rate. From this figure, it can be seen that the lighter the coating color of the back surface 3a of the reflection plate 3, the higher the detection rate.

[0053]

According to the inspection lighting device of the first aspect of the present invention, it is possible to eliminate the reflection from the rear portion of the reflector, and the unnecessary projection image of the rod-shaped lamp is reflected by the reflection from the rear portion of the reflector. It is possible to clearly project the required number of rod-shaped lamp projection images on the surface of the object to be inspected, and to perform high-precision surface inspection.

According to the inspection illuminator of claim 2,
By rotating the reflection plate, the irradiation direction of the reflected light can be changed, and when the equipment mounting position is changed,
By changing the angle of the reflector accordingly, the projection direction of the rod-shaped lamp projection image can be optimally adjusted according to the direction of the inspection object from the attachment position of the device. That is, no matter where the instrument is attached, the projection direction of the projected image of the rod-shaped lamp can always be set to the optimum position, and it is possible to easily cope with the change of the instrument attachment position.

According to the inspection lighting fixture of claim 3,
The angle formed by the side surface portion with respect to the back surface portion of the reflector can be adjusted, and the interval between the direct projection image of the rod-shaped lamp by the direct light and the reflection indirect projection image of the rod-shaped lamp by the reflected light can be arbitrarily adjusted. As a result, it is possible to easily adjust the interval between the reflected indirect projection images of the rod-shaped lamp in order to maximize the inspection accuracy.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing the configuration of an inspection lighting fixture according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a configuration of an inspection lighting fixture according to a second embodiment of the present invention.

FIG. 3 is a schematic diagram showing a configuration of an inspection lighting fixture according to a third embodiment of the present invention.

FIG. 4 is a schematic view showing a second member in FIG.

FIG. 5 is a schematic diagram showing a configuration of an inspection lighting fixture according to a fourth embodiment of the present invention.

FIG. 6 is a schematic diagram showing the structure of an inspection lighting fixture according to a fifth embodiment of the present invention.

FIG. 7 is a schematic side view showing the configuration of the inspection lighting fixture of the sixth embodiment of the present invention.

FIG. 8 is a schematic front view showing the structure of the inspection luminaire of the sixth embodiment.

FIG. 9 is a schematic view showing an installation state of an inspection lighting fixture.

10 is a plan view, a side view, and a front view showing a specific configuration of the inspection lighting fixture of FIGS. 7 and 8. FIG.

11 is a partially enlarged side view of the inspection lighting fixture of FIG.

12 is a partially enlarged front view of the inspection lighting fixture of FIG.

FIG. 13 is a schematic side view showing the configuration of the inspection lighting fixture of the seventh embodiment of the present invention.

14 is a perspective view showing a specific example of the rod-shaped lamp in FIG.

FIG. 15 is a bar graph showing the results of measuring the detection rate of abnormal portions by changing the pitch of the rod-shaped lamp projection image on the surface of the inspection object.

FIG. 16 is a characteristic diagram showing the results of an examination of the relationship between the light color of a rod-shaped lamp and the brightness contrast when the back surface of the reflector is matted black.

FIG. 17 is a schematic view showing a state in which three rod-shaped lamp projection images of the surface of the inspection object are projected by irradiating the surface of the inspection object with the irradiation light from the inspection luminaire.

FIG. 18 is a diagram showing projection images of three rod-shaped lamps on the surface of the inspection object by irradiating the surface of the inspection object with irradiation light from the inspection lighting device when the opening angle of the side surface of the reflection plate is changed. It is the schematic which shows the state where it has gone.

FIG. 19 shows projection images of three rod-shaped lamps on the surface of the inspection object by irradiating the surface of the inspection object with irradiation light from the inspection lighting device when a light-reducing plate or the like is installed in front of the rod-shaped lamp. It is the schematic which shows the state where it has gone.

FIG. 20 is a schematic view showing the state of reflection when the color of the back surface of the reflector is black matte.

FIG. 21 is a schematic diagram showing a reflection state when the color of the back surface of the reflector is a light color such as milky white.

22 is an enlarged view of a part of FIG. 21. FIG.

FIG. 23 is a characteristic diagram showing the relationship between the coating color of the back surface of the reflector and the detection rate.

FIG. 24 is a schematic diagram showing a configuration of a first conventional example of an inspection lighting fixture.

FIG. 25 is a schematic diagram showing a configuration of a second conventional example of the inspection lighting fixture.

FIG. 26 is a schematic view showing a usage state of a conventional inspection luminaire.

[Explanation of symbols]

 1 Instrument Main Body 2 Rod-shaped Lamp 3 Reflector 3a Back Part 3b Side Part 6 Reflector 6a Back Part 6b Side Part 6c Hinge 8 Reflector Fixing Plate 9 Screw

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takayuki Endo 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Nissan Motor Co., Ltd.

Claims (3)

[Claims] 1. A rod-shaped lamp and a reflector are provided, and the reflector is composed of a back surface portion and side surface portions respectively covering the back and both sides of the rod lamp, and the surface of the back surface is a non-reflection surface. An inspection luminaire whose surface is a mirror surface. 2. The inspection luminaire according to claim 1, wherein the reflector is rotatable about the tube axis of the rod-shaped lamp. 3. The inspection luminaire according to claim 1, wherein a back surface portion and a side surface portion of the reflector are hingedly connected to each other so that an angle between them can be changed.