JPH0758265B2 - Inspection lighting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a lighting device for inspection, and in particular, a plurality of rows of vertical line light source images are projected on a surface to be inspected of an inspection object which passes through an inspection line and defects thereof. Of the inspection device.

[Prior Art] Conventionally, an inspection illuminating device that projects a plurality of lines of a line light source image on a surface to be inspected is well known, and various surfaces are utilized by utilizing the brightness contrast on the surface to be inspected and the disorder of the line light source image. Since it can be inspected for defects, it is widely used, for example, for inspecting defects on car body painted surfaces or for other purposes.

In particular, in order to inspect a painted surface of an automobile, a simultaneous inspection is often performed using at least two or more rows of inspection lines provided in parallel. In this case, each inspection line is provided with the inspection illumination device. Then, a defect inspection of the painted surface of the vehicle passing through each line is performed.

FIG. 8 shows an example of a conventional inspection illuminating device. This conventional device has three rows of inspection lines 10A,
Two independent rows of inspection illuminators 300A1 and 300A2, 300B1 and 300B2, 300C1 and 300C2 are provided on both sides of 10B and 10C.

Each of the inspection lighting devices 300 includes a plurality of lighting fixtures 14 provided at regular intervals along each inspection line 10, and of the automobile 100 passing through each inspection line 10 at a low speed using the belt conveyor 12. It is formed so as to project a plurality of vertical line light source images on the surface 110 to be inspected.

Therefore, the inspector continuously inspects the surface condition by utilizing the brightness contrast of the line light source image projected on the inspected surface 110 of the automobile 100 and the disturbance of the line light source image, and The existing defects such as spots, scratches, sagging, and cissing can be visually inspected.

FIG. 9 shows a specific structure of a lighting fixture 14 used in a conventional inspection lighting device.
Is two line light sources 16a and 16b arranged in parallel in the vertical direction.
And a white reflector 18 provided on the back surface of the line light source 16 and fixed to the stand 20 so as to directly project two vertical direction line light source images as an image 200 toward the surface 110 to be inspected of the automobile 100. There is. The linear light source 16 is usually a rod-shaped fluorescent lamp.

Therefore, as shown in FIG. 9, by providing the inspection illumination device 300 on both sides of each inspection line 10, the surface to be inspected 110 of the automobile 100 passing through each inspection line 10 at a low speed.
For example, a plurality of rows of vertical line light source images 200 are projected on the inspected surfaces 110B1 and 110B2 of the automobile 100B passing through the inspection line 10B, and the inspector disturbs the brightness contrast and the line light source image on the inspected surface 110. By using, it is possible to continuously visually inspect for the presence of surface defects such as spots, scratches, sagging, and cissing.

[Problems to be Solved by the Invention] (a) In such a visual inspection, a defect located at a position overlapping with a linear light source image normally appearing on the surface of the surface 110 to be inspected or a defect in the immediate vicinity of the linear light source image. Can only be found. Therefore, in such an inspection lighting device 300,
It is required to project a large number of linear light source images on the surface to be inspected 110 finely and at equal intervals over a plurality of rows.

However, in the conventional apparatus 300 shown in FIG. 9, since only one linear light source 16 can directly project the image 200 onto the surface 110 to be inspected, many inspection lines 10 are provided on both sides. The line light source 16 and the white reflective shade 18 must be provided,
Initial cost (equipment cost, etc.) and running cost (consumable replacement cost for fluorescent lamps, equipment maintenance cost, etc.)
There was a problem that the electric power cost, etc.) would be extremely expensive.

In particular, in contrast to the multiple lines of inspection lines 10A, 10B, 10C provided as shown in FIG. 8, in the conventional device, two lines of inspection illumination devices 300 are provided on both sides of each inspection line 10A, 10B, 10C. Must be provided independently. Therefore, there has been a problem that the initial cost and running cost of the entire apparatus become more expensive in proportion to the number of inspection lines 10.

(B) Moreover, in such a conventional device, the inspection line 10
The lighting fixtures 14 are attached to the left and right sides of the same along a predetermined distance. However, in the luminaire 14 used in the conventional device, two fluorescent lamps are already installed as a set of line light sources 16a and 16b at a constant interval, and the interval cannot be freely adjusted. Therefore, each of the linear light sources 16 can project only the direct image 200 at a constant interval on the surface 110 to be inspected, and therefore the interval of the linear light source images projected on the surface 110 to be inspected may be changed as necessary. There was a problem that the optimum interval could not be adjusted.

(C) Further, in the conventional apparatus, a large number of line light sources 16 are provided on both sides of each inspection line 10 at regular intervals, and the surface to be inspected 110
A large number of linear light source images are projected finely and at equal intervals over a plurality of rows.

Therefore, there is a problem that the illuminance on the surface of the surface 110 to be inspected becomes too high and the luminance contrast of the defect is lowered, and the surface defect is overlooked.

Furthermore, if the illuminance on the surface to be inspected rises in this way,
There was a problem that the inspector's eyes were easily tired.

Further, in order to solve the above-mentioned problem (a), a proposal of Japanese Patent Laid-Open No. 56-132509 has been conventionally made.
As a lighting fixture, a substantially V-shaped reflecting mirror is provided around the linear light source so as to face the surface to be inspected.

By doing so, a direct image from the linear light source and a pair of reflected indirect images from the V-shaped reflecting mirror are projected on the surface to be inspected, and as a result, the number of linear light sources is increased. It is possible to project a triple line light source image on the surface to be inspected without increasing the number of lines.

However, even such a conventional device, as shown in FIG.
When a plurality of inspection lines 10 are provided in parallel, the inspection illumination devices 30 are provided on both sides of each inspection line 10.
It is necessary to install 0s in two rows independently. For example, the inspection illuminating device 300A2 and the inspection illuminating device 300B1 must be independently provided between the adjacent inspection lines 10A and 10B, and one row of the inspection illuminating device 300 is inspected in two adjacent rows. It cannot be used also as an inspection illumination device for the lines 10A and 10B. For this reason, there has been a problem that the initial cost and running cost of the entire apparatus increase in proportion to the number of inspection lines 10.

That is, even in the conventional apparatus of Japanese Patent Laid-Open No. 56-132509, when a plurality of inspection lines 10 are provided in parallel as shown in FIG. 8, a linear light source and a reflecting mirror are provided on both sides of each adjacent inspection line 10. Must be provided independently, for example, in an inspection line
The line light source and the reflecting mirror provided between 10A and 10B cannot be shared with each other. For this reason, the initial cost and the running cost of the entire inspection illuminating device increase in proportion to the increase in the inspection line 10, and an effective countermeasure against this has been desired.

[Object of the Invention] The present invention has been made in view of such a conventional problem, and an object of the present invention is to provide a common line light source and reflection for each inspection object passing through two adjacent inspection lines. An object of the present invention is to provide a vertical illuminating light source image in a plurality of rows by using a mirror, and to provide an inspection illuminating device with low initial cost and running cost of the entire device.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a plurality of rows on each surface to be inspected of each inspection object that passes through at least two or more rows of inspection lines provided in parallel. Projects a vertical line light source image,
In a device that performs a defect inspection on the surface to be inspected of an inspection object that passes through each line, it is installed along the line between adjacent inspection lines and vertically on the surface to be inspected of each inspection object that passes through both inspection lines. A plurality of line light sources that directly project the direction line light source image as an image, and are installed at a predetermined reflection angle along the line between the line light sources, and on the surface to be inspected of each inspection object that passes through the inspection lines on both sides. A plurality of double-sided reflecting mirrors for projecting a vertical direction light source image of the linear light source as a reflected indirect image, and the respective double-sided reflecting mirrors located on both sides of the respective linear light sources are inspection objects passing through inspection lines on both sides. The vertical line light source images in two columns are projected onto the surface to be inspected.

Points of Interest Next, points of interest of the present invention will be briefly described in comparison with a conventional device.

(A) Conventional device Fig. 9 shows a principle diagram of a conventional inspection lighting device. This device is equipped with a lighting fixture 14A via a mounting stand 20 between adjacent inspection lines 10A and 10B. And 14B are attached back to back and fixed, and a direct image of the linear light source is applied to the corresponding inspected surfaces 110A2 and 110B1 using the respective lighting fixtures 14A and 14B.
Projecting 200.

Therefore, the lighting fixtures 14A and 14B provided between the adjacent inspection lines 10A and 10B cannot be used as the illumination devices for both the inspection lines 10A and 10B, and the number of the illumination devices 14 increases as the inspection lines 10 increase. Increases in proportion.

As a result, there is a problem that the initial cost and running cost of the entire inspection lighting device increase in proportion to the increase in the number of inspection lines 10 provided in parallel.

Furthermore, this conventional apparatus can only project one vertical direction line light source image from each line light source 16 directly as the image 200. The distance between the line light source images projected on the surface 110 to be inspected is determined by the distance between the line light sources 16a and 16b, and the distance between the line light source images projected on the surface 110 to be inspected can be adjusted as necessary. There wasn't.

(B) Present Invention FIG. 1 shows the principle of the present invention.

The first characteristic feature of the present invention is that inspection lines 10 adjacent to each other are provided.
A plurality of line light sources 16 are provided at predetermined intervals along the line between A and 10B, and a vertical line on the inspected surface 110A2 and 110B1 of the inspection object that passes through both side inspection lines 10A and 10B from each line light source 16. It is to project the light source image as the direct image 200.

A second characteristic of the present invention is that a plurality of double-sided reflecting mirrors 24 having a predetermined reflection angle are provided between the respective line light sources 16 along a line, and each inspection object passing through both-side inspection lines 10A and 10B. This is to project the vertical line light source image of the corresponding line light source 16 on the surfaces to be inspected 110A and 110B as a reflected indirect image 210.

By doing this, the inspection lines 10A, 10
The linear light source 16 and the double-sided reflecting mirror 24 provided between B can be used also as a lighting fixture for both inspection lines 10A and 10B. Therefore, even when a plurality of inspection lines 10 are provided in parallel, it is only necessary to provide one row of inspection illumination devices along the line between the adjacent inspection lines 10, and the line light source 16 to be used and The number of reflectors 24 is significantly reduced,
The initial cost and running cost of the entire device can be significantly reduced.

Particularly, according to the present invention, one line light source 16 and the double-sided reflecting mirrors 24 on both sides thereof are used to inspect adjacent inspection lines 10A and 10B.
It is possible to project the direct image 200 and the reflected indirect image 210 of the vertical line light source on the inspected surfaces 110A2 and 110B1 of the inspection object passing through, respectively, and a total of four line light source images from one line light source 16. It will be appreciated that can be projected.

Furthermore, according to the present invention, by making it possible to arbitrarily set the reflection angle of the double-sided reflecting mirror 24, the linear light source images 200, 210 projected on the surface 110 to be inspected can be appropriately adjusted according to the inspection direction. Therefore, it is possible to improve the reliability of defect detection on the surface 110 to be inspected.

[Operation] Next, the operation of the present invention will be described by exemplifying a case where one row of the inspection illumination device 300 is provided between the adjacent inspection lines 10A and 10B as shown in FIG.

The inspection lighting device 300 according to the present invention includes the inspection lines 1 adjacent to each other.
From the plurality of linear light sources 16 provided between 0A and 10B, a plurality of vertical direction linear light source images 20 directly on the inspected surfaces 110A2 and 110B1 of the inspection object passing through the both-side inspection lines 10A and 10B.
Projected as 0.

In addition, the inspection lighting device 300 of the present invention includes the linear light sources 16 described above.
From a plurality of double-sided reflecting mirrors 24 provided between the inspection surfaces 110A2 of the inspection object passing through the both-side inspection lines 10A and 10B.
And a plurality of vertical direction light source images 210B1 on the reflected indirect image 210.
Is projected as.

Thus, according to the present invention, adjacent inspection lines
Only by providing one row of the inspection illumination device 300 between 10A and 10B, the inspection object passing through the both-side inspection lines 10A and 10B, for example, the inspection surfaces 110A2 and 1 of the automobiles 100A and 100B.
Direct image 200 of vertical line light source image and reflected indirect image 210 on 10B1.
Can be projected alternately in a plurality of columns, and the surface defect can be visually inspected by utilizing the brightness contrast on the inspected surfaces 110A2 and 110B1 and the disturbance of the line light source image.

Therefore, according to the present invention, the number of the linear light sources 16 to be used is significantly reduced, and the equipment cost, the power cost, the replacement cost of the consumable parts of the fluorescent lamp, the maintenance cost of the equipment, etc. are reduced, and the initial cost of the entire apparatus and It is possible to significantly reduce running costs.

Furthermore, according to the present invention, since the number of linear light sources 16 used is significantly reduced, in terms of the inspection environment maintenance of the inspection line 10,
The need for air conditioning measures due to heat generation is reduced, and also from this aspect, the initial cost and running cost of the entire apparatus can be reduced.

In particular, according to the present invention, a total of four vertical line light source images can be projected from each line light source 16 toward the inspected surfaces 110A2 and 110B1 located on both sides thereof.

Therefore, the number of the line light sources 16 provided between the adjacent inspection lines 10A and 10B can be reduced to 1/4 as compared with the conventional device shown in FIG.

As a result, according to the present invention, as the number of inspection lines 10 provided in parallel increases, the effect of reducing the initial cost and running cost of the entire inspection illumination device becomes more remarkable.

Further, according to the present invention, by reducing the number of the line light sources 16, it is possible to keep the surroundings to be appropriately bright and to significantly reduce eye fatigue of the inspector.

Further, in this type of inspection apparatus, that is, an apparatus that projects a line light source image on the surface 110 to be inspected and has a brightness contrast that detects defects by utilizing the disturbance of the line light source image, the illuminance (brightness) is high. It is not required, and even if the illuminance is low, it does not hinder the inspection of defects. Rather, as in the present invention, the number of linear light sources 16 used is reduced, so that the direct image 200 and the reflected indirect image 210 of the linear light source on the surface 110 to be inspected.
Since the brightness of the background portion in which is not reflected is decreased, the brightness contrast of the defect is increased, and this can be easily detected.

In the present invention, each double-sided reflecting mirror 24 has a surface 110 to be inspected.
It is preferable to install at a position equidistant d from each line light source 16 on a straight line 1 parallel to the above, and if necessary, an inclination angle α with the straight line l, that is, a reflection angle α can be adjusted to an arbitrary angle. Preferably.

Further, the double-sided reflecting mirror 24, whose reflecting surface is usually formed as a flat reflecting mirror, controls the width of the reflected indirect image 210 of the vertical direction line light source image (when widening or narrowing). In this case, the reflecting surface may be formed as a curved reflecting mirror having an arbitrary curvature as needed.

Further, according to the present invention, each inspection line located on the outermost side
A plurality of rows of reflective luminaires 14 are preferably installed at predetermined intervals along the outside of 10A and 10B.

That is, as shown in FIG. 2, a plurality of line light sources 16 are installed at predetermined intervals along the outer sides of the outermost inspection lines 10A and 10B, and the inspections passing through the corresponding inspection lines 10A and 10B. A vertical line light source image is directly projected as an image 200 on the inspected surfaces 110A1 and 110B2 of the object.

Then, the surfaces 110A1 and 110 to be inspected are provided around the respective line light sources 16.
A V-shaped reflecting mirror 22 is provided so as to face B2, and the surface 110A to be inspected
Reflects the vertical light source image of the line light source on 1 and 110B2 Indirect image 21
Project as 0. In this way, one set of line light sources 16
Since a total of three vertical line light source images can be projected onto the surface 110 to be inspected by using the and V-shaped reflecting mirror 22, the conventional apparatus which does not use the reflected indirect image 210 at all as shown in FIG. The number of linear light sources 16 can be significantly reduced as compared with.

Experimental Data Next, experimental data on the influence of the illuminance on the surface 110 to be inspected on the luminance contrast of the defect will be briefly described.

(I) According to the experiment, the illuminance (lx) of the surface 110 to be inspected is 10
0,200,300,500,1000,1500,2000,3000 Inspected surface 110
The brightness contrast of each of the above defects is about 73.
%, 59%, 50%, 39%, 24%, 16%, 14%, 8% were confirmed.

As is clear from this experimental data, when the illuminance (lx) of the surface 110 to be inspected increases, the luminance contrast (%) of the defect decreases exponentially. Therefore, the surface to be inspected 11
In order to reliably detect a defect existing on 0 by visual inspection, the illumination device 300 for inspection is kept so that the illuminance on the surface 110 to be inspected is kept at an appropriate value and the luminance contrast (%) of the defect is sufficiently large. It is required to make the design.

(Ii) Based on this point of view, how the illuminance (lx) of the surface 110 to be inspected changes depending on the combination of the linear light source 16 and the reflecting mirror was measured by an experiment.

In the experiment, as shown in Fig. 3, 60cm in length 3.6m
Seven fluorescent lights 16-1, 16-2, 16-2, 16-3, 16-3, 16 at intervals
With reference to the state in which −4 and 16-4 are arranged in parallel, the illuminance of the surface 110 to be inspected when the reflecting mirror M is gradually expanded outward from the center fluorescent lamp 16-1 and the reflecting mirror M Instead, we measured the illuminance and the illuminance when a fluorescent lamp was added.

The measurement was performed by installing an illuminometer at a position 1.5 m away from the central fluorescent lamp 16-1.

As a result, the illuminometer showed a measured value of 610 lx in the state where all seven fluorescent lamps 16-1 to 16-4 shown in FIG. 3 were turned on.

Next, M1, M2, M3 in order from both sides of the central fluorescent lamp 16-1.
When the reflectors of No. 1 are sequentially added as shown in the figure, for example, when the mountain-shaped reflector M1 is installed between the fluorescent lamps 16-1 and 16-2, the reflection indirect of the mountain-shaped reflector M1 is According to the image, the line light source image of the fluorescent lamp increases by 2 and the measurement illuminance increases by 145 lx.

In addition, if the M2 mountain reflector is installed between the 16-2 and 16-3 fluorescent lamps in addition to the mountain reflector M1, the measured illuminance is further increased.
40lx increase, and if the M3 mountain reflector is added between the fluorescent lamps 16-3 and 16-4, the measurement illuminance will further increase by 17lx.

Therefore, according to the experiment, as shown in FIG.
-If M1, M2 and M3 chevron reflectors are installed between a total of 7 fluorescent lamps, the illuminance will increase by about 400 lx and the illuminance meter will increase by about 100.
It shows the measured value of 0lx.

On the other hand, when a fluorescent lamp is added instead of the mountain reflector M1, the illuminance increases by about 270 lx, and when a fluorescent lamp is added instead of the mountain reflector M2, the illuminance increases by about 190 lx. If a fluorescent lamp is added instead of the M3, the illuminance will increase by about 110 lx.

In this way, if a fluorescent lamp is added instead of the mountain-shaped reflecting mirrors M1, M2, and M3, the illuminance, which was increased by only about 400 lx when the mountain-shaped reflecting mirror is used, is increased by about 1140 lx.

Therefore, in the case of considering the inspection illumination device 300 having a length of 3.6 m, the illuminance of the surface 110 to be inspected is about 1000 lx when the mountain-shaped reflecting mirrors M1 to M3 are used, whereas the mountain-shaped reflecting mirror is used. If a fluorescent lamp is added instead of the above, the illuminance of the surface 110 to be inspected is approximately 1750 l.
It will be appreciated that it exhibits a very high value for x.

As is clear from this experimental data, in the inspection illumination device 300 using the reflecting mirror as in the present invention, the number of linear light sources (bar-shaped fluorescent lamps in the experiment) 16 used is reduced, so that the surface to be inspected is reduced. The brightness contrast of the defect existing on 110 is increased, and the surface defect can be detected more reliably.

Further, in the actual conventional apparatus shown in FIG. 8, several tens of fluorescent lamps are provided as the line light source 16, and therefore the surface 110 to be inspected
Although the above measured illuminance shows a higher value than the experimental result, in the inspection illumination device 300 of the present invention, the illuminance of the surface 110 to be inspected is suppressed to an appropriate value by using the double-sided reflecting mirror 24. Therefore, it is understood that the eye fatigue of the inspector can be remarkably reduced, which is extremely preferable for the health care of the inspector, and the occurrence of the inspection error due to the eye fatigue of the inspector can be significantly reduced.

[Effects of the Invention] As described above, according to the present invention, a line light source and a double-sided reflecting mirror provided between adjacent inspection lines are attached to an inspected surface of an inspection object that passes through both inspection lines. Since it can be shared for defect inspection, the number of linear light sources used is significantly reduced when at least two rows of inspection lines are provided in parallel, and the initial cost and running cost of the entire device are significantly reduced. It is possible to go down.

In particular, according to the present invention, as the number of inspection lines provided in parallel increases, the number of line light sources used is significantly reduced as compared with the conventional inspection illumination device, and the initial cost and running cost of the entire device are significantly reduced. It is possible to reduce the cost.

Furthermore, according to the present invention, since a double-sided reflecting mirror is installed between each line light source and a total of four vertical direction line light source images can be projected from one line light source, the line used in comparison with the conventional device is used. Also from this aspect, the number of light sources can be significantly reduced, and the cost of the entire device can be reduced.

[Embodiment] Next, a preferred embodiment of the present invention will be described with reference to the drawings.

FIG. 4 shows a preferred example of the inspection illumination device according to the present invention, in which the inspection lines 10A, 1 are arranged in parallel.
The inspection illumination device 300 of the present invention is provided between 0B.

The inspection lighting device 300 according to the present embodiment includes a mounting frame 30.
, A plurality of linear light sources 16 and double-sided reflecting mirrors 24 are alternately mounted, and the mounting interval of each linear light source 16 is set to d = 30 cm. The double-sided reflecting mirrors 24 are installed at the intermediate positions d'between the adjacent linear light sources, and therefore the double-sided reflecting mirrors 24 are arranged.
The mounting interval of 24 is also set to d = 30 cm.

In the present embodiment, the double-sided reflecting mirror 24 is provided with a rotation mechanism described later, and the reflection angle with respect to the linear light source 16 can be set to a desired angle as necessary.

Further, the inspection lines 10A and 10B of the present embodiment are formed so that the automobiles 100A and 100B as inspection objects move in opposite directions as indicated by arrows in the figure.

Then, the inspector may visually inspect the inspected surfaces 110A and 110B of the automobiles 100A and 100B from the P1 direction in the inspection line 10A and the P2 direction in the inspection line 10B, and at this time, the inspected direction from the P1 and P2 directions. The inspection angle for viewing the surface 110 is set to θ = 30 degrees with respect to the normal line of the surface 110 to be inspected.

Therefore, in the inspection illumination device 300 of the embodiment, each double-sided reflecting mirror 24 is fixed to the mounting frame 30 at a mounting angle of β = 60 degrees by using a rotating mechanism described later.

By doing so, the inspection illumination device 30 of the embodiment
Vehicle 100A moving from 0 to inspection line 10A and 10B
A direct image 200 from the linear light source 16 and a reflected indirect image 210 from the double-sided reflecting mirror 24 toward the inspected surfaces 110A2 and 110B1 of 100B and 100B,
Will be projected alternately.

FIG. 5 shows three rows of inspection lines 10A, 10 arranged in parallel.
B, 10C shows an embodiment in which the inspection lighting device 300-1, 300-2 of the present invention is provided, and in each inspection line 10A, 10B, 10C, the automobile 100 as the inspection object in the direction shown by the arrow in the figure.
Are formed to move.

Here, in the inspection line 10A, the automobile 100 of the vehicle type I
A, inspection line 10C, vehicle type II automobile 100C, inspection line
In 10B, the inspection of the automobile 100B of the vehicle type I or II is performed.

That is, the automobile 100A moves downward in the drawing on the inspection line 10A, and the automobile 100B moves upward in the drawing on the inspection line 10B. Therefore, both of these inspection lines 10A and 10B
In between, there is an illumination device for inspection having the same structure as that shown in FIG.
300-1 is provided.

Further, the inspection illumination device 300-2 of the present invention is provided between the inspection line 10B and the inspection line 10C, and the inspection illumination device 300-2 of the embodiment performs the inspection with the inspection line 10B interposed therebetween. The lighting device 300-1 is formed so as to have a substantially plane-symmetric structure.

Further, the outer wall 32 of the inspection lines 10A and 10B located on the outermost side
A plurality of luminaires 14 each consisting of a linear light source 16 and a V-shaped reflecting mirror 22 are attached and fixed to A and 32C at regular intervals.

In the present embodiment, the inspection angle θ of each vehicle 100 with respect to the surface 110 to be inspected is set to θ = 30 degrees with respect to the normal to the surface 110 to be inspected. For this reason, the linear light sources 16 provided on the outer walls 32A and 32C have their mounting intervals set to d1 = 45 cm, and the mounting angle between the one reflecting surface 22a of the V-shaped reflecting mirror 22 and the wall surface 32 is α. = 60 degrees, and the mounting angle between the other reflecting surface 22b and the outer wall 32 is set to β = 30 degrees.

Therefore, from the respective lighting fixtures 14 provided on the outer walls 32A and 32C, the direct image 200 of the linear light source 16 and the reflected indirect image 210 are projected at an interval of d2 = 15 cm toward the inspection surfaces 110A1 and 110C2 of the automobiles 100A and 100C. Will be done.

In addition, in the inspection illumination devices 300-1 and 300-2, as described above, the distance between the line light sources 16 is 30 cm, and the double-sided reflecting mirror 24 is used for each line light source 16.
It is fixed at a mounting angle of γ = 60 degrees between.

Therefore, from the inspection lighting device 300-1, both inspection lines 1
Inspection surface 110 of automobiles 100A and 100B passing through 0A and 10B
Direct image 200 and reflected indirect image 21 of line light source 16 toward A2 and 110B1
0 and 0 will be projected alternately at an interval of d3 = 15 cm.

Similarly, from the inspection illumination device 300-2, the direct image 200 and the reflected indirect image 210 of the linear light source 16 are directed toward the inspected surfaces 110B2 and 110C1 of the automobiles 100B and 100C passing through the inspection lines 10B and 10C. It will be projected alternately at an interval of d3 = 15 cm.

FIG. 6 shows a front explanatory view of the inspection lighting device 300. A rod-shaped fluorescent lamp is used as the linear light source 16 of the embodiment, and the fluorescent lamp is provided in the upper and lower frames 30a and 30b. It is attached to the lamp socket 33.

The double-sided reflecting mirror 24 is rotatably attached to the upper and lower frames 30a and 30b, like the linear light source 16. A lighting fixture 34 for a fluorescent lamp that constitutes each linear light source 16 is attached and fixed to the upper frame 32b.

FIG. 7 shows a specific structure of the double-sided reflecting mirror 24. FIG. 7 (A) is a side view thereof, FIG. 7 (B) is a front view thereof, and FIG. ) Indicates the configuration of the reflector rotation fixing screw.

In the present embodiment, the double-sided reflecting mirror 24 is formed by fixing the double-sided reflecting mirror 42 in the center of a rectangular-shaped reflecting mirror supporting base 40, and the upper and lower frames 30b by a rotation shaft provided in the supporting base 40. , 30a are rotatably attached.

Here, the lower rotation shaft provided on the support base 40 is rotatably inserted into the mounting hole of the lower frame 30a.

Further, the upper rotation shaft provided on the support base 40 is rotatably inserted into the upper frame 30b provided with the ring 44, and by tightening the fixing screw 46 provided on the ring 44, double-sided reflection occurs. The mounting angle of the mirror 24 is fixed.

Therefore, in the apparatus of the embodiment, the mounting angle of the double-sided reflecting mirror 24 can be adjusted to the optimum value according to the observation angle θ of the inspector.

In this embodiment, the automobile 10 is used as the inspection object.
Although description has been made by taking the case of performing the defect inspection of the painted surface of No. 0 as an example, the present invention is not limited to this and can be widely used for the defect inspection of the surface to be inspected of other inspection objects.

[Brief description of drawings]

1 and 2 are explanatory views of the principle of the inspection illuminating device according to the present invention, and FIG. 3 shows a combination of a line light source and a reflecting mirror, which is used to show the illuminance on the surface to be inspected and the defect brightness contrast. Explanatory drawing of the experimental apparatus used to measure the relationship, FIG. 4 and FIG. 5 are explanatory views showing a preferred example of the inspection lighting apparatus of the present invention, FIG. 6 is shown in FIG. 4 and FIG. FIG. 7 is a side view of the inspection illuminating device used, FIG. 7 is an explanatory diagram showing a specific configuration of the double-sided reflecting mirror shown in FIG. 6, and FIGS. 8 and 9 are examples of conventional inspection illuminating devices. FIG. 10 …… Inspection line 16 …… Line source 22 …… V-shaped reflector 24 …… Double-sided reflector 100 …… Car 110 …… Inspected surface 200 …… Direct image 210 …… Reflected indirect image

Claims (3)

[Claims] 1. An inspection object which projects a plurality of lines of vertical direction light source images on a surface to be inspected of each inspection object passing through at least two or more inspection lines arranged in parallel and passing through each line. In a device for inspecting defects on a surface to be inspected of an object, a vertical line light source image is directly imaged on the surface to be inspected of each inspection object which is provided along a line between adjacent inspection lines and passes through the inspection lines on both sides. A plurality of linear light sources projecting as, and a vertical line light source of the linear light source that is installed on the surface to be inspected of each inspection object that passes through the inspection lines on both sides and is installed at a predetermined reflection angle along the line between the respective linear light sources. A plurality of double-sided reflecting mirrors for projecting an image as a reflected indirect image, and the double-sided reflecting mirrors positioned on both sides of each of the linear light sources, with respect to the surface to be inspected of each inspection object passing through the inspection lines on both sides, Two vertical light sources each Inspection lighting apparatus characterized by projecting a. 2. The inspection illumination device according to claim 1, wherein each of the double-sided reflecting mirrors is formed so that a reflection angle with respect to a line light source can be adjusted. 3. The apparatus according to any one of claims (1) and (2), wherein each inspection is provided along the outer side of each outermost inspection line and passes through the corresponding inspection line. A plurality of line light sources that project a vertical direction light source as an image directly on the surface to be inspected of the object, and are provided around the respective line light source images so as to face the surface to be inspected, and the vertical direction of the line light source is provided on the surface to be inspected. An illumination device for inspection, comprising: a plurality of V-shaped reflecting mirrors that project a direction line light source image as a reflected indirect image.