JPH05288937A - Light source device - Google Patents

Abstract

PURPOSE:To project projection light in both an axial and an end surface directions at the same time by a single light source device and to control the intensity of the projection light. CONSTITUTION:The light source device 10 consists of a rod 12 which has its outer peripheral surface coated with diffusion stripes extending in the axial direction and also has a lamp 24 with a reflecting mirror arranged on its incidence end surface; and the projection end surface 40 of the rod 12 is formed selectively into a polished surface and a diffusion surface having different roughness and the polished surface or different-roughness diffusion surface is properly selected according to the intensity of the required projection light. Further, the projection end surface 40 is formed selectively into a flat surface, a convex surface, and a concave surface, which are properly selected according to the intensity of the required projection light.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light source device, and more particularly to a light source device using a rod for optical transmission.

[0002]

2. Description of the Related Art Generally, a light source device is used in an inspection for investigating the presence or absence of a surface defect in an L-shaped product or the like. That is, the presence or absence of a defect is confirmed by arranging the light source device inside the L-shaped member and lighting it, and detecting the pattern of reflected light from the light sources in the two vertical directions.

As a light source device used for such an inspection, a double-end type fluorescent lamp has been used.

In addition, a light source for inspection and a illuminating device using the emitted light emitted from the light emitted from the two vertical directions and emitted around the circumference having a constant axial distance in the direction perpendicular to the axis of the emitted light in one direction. Also, this double-end type fluorescent lamp was used.

As a light source device used for such an application, in addition to the double end type fluorescent lamp described above, a linear light emitting device for inspecting and illuminating a wall surface portion,
A point light source device for inspecting a surface perpendicular to the wall surface portion was used as a light source device in combination, but in this case, it was necessary to prepare two types of light source devices. In this case, for example, a fluorescent lamp is used as the linear light emitting light source device, and a halogen lamp with a reflecting mirror is used as the point light source device.

In order to perform an inspection using the above-mentioned two kinds of light source devices, first, the linear light emitting light source device is inserted into a predetermined position and turned on, and the linear light emitting light source device is centered on the axis. As a result, the entire surface of the wall surface, which is an inspection surface extending in the axial direction, is emitted, and the presence or absence of defects is inspected. When this inspection is completed, the linear light emitting light source device is pulled out, a point light source device is newly inserted and turned on, and the light is emitted in the direction perpendicular to the wall surface portion for inspection. As described above, as a conventional light source device in two vertical planes, a double-end type fluorescent lamp is used instead, or two types of light source devices are used to inspect for defects and perform special illumination.

[0007]

In the above-mentioned conventional technique, in a double-end type fluorescent lamp or the like, the emitted light is emitted as diffused light in all directions.
When such a diffused light source is used, there is a problem that it cannot be used as emitted light having directivity in two vertical directions.

When a linear light emitting light source device and a point light source device are used to inspect for defects, two types of light source devices are required, which increases cost and Since the inspection process is complicated, the inspection work is complicated.

Further, since the two kinds of light source devices are independent from each other, when controlling the intensity of the light emitted from the linear light emitting light source device and the point light source device as required for inspection. However, it is necessary to change the intensity of the light emitted from the linear light emitting light source device and the point light source device by separate operations, resulting in poor operability.

The present invention has been made in view of the above problems of the prior art, and an object thereof is to output light in two directions, an axial direction and an end face direction, by a single light source device. An object of the present invention is to provide a light source device that allows emitted light to be emitted and controls the intensity of the emitted light to reduce cost and improve operability.

[0011]

To achieve the above object, the light source device according to the present invention is a light source device in which diffusion fringes extending in the axial direction are applied to the outer peripheral surface and light source means is disposed on one end surface. In a light source device composed of a transmission rod, the other end surface of the rod is selectively formed on a polishing surface or a diffusing surface having different roughness, and the polishing surface or roughness is adjusted according to the intensity of the emitted light required. The diffusion surface of which is different is selected appropriately.

Further, the other end face shape is a plane selectively,
It may be formed into a convex surface or a concave surface, and a flat surface, a convex surface or a concave surface may be appropriately selected according to the required intensity of emitted light. Such a convex surface includes a shape such as a cone or a hemisphere.

[0013]

When light is incident on the rod for optical transmission from one end surface by the light source means, the incident light is diffusely reflected by the diffusion fringes, and the rod of the rod for optical transmission operates by the lens action. From the inside, a part of the incident light component is emitted with directivity in the direction opposite to the diffusion fringes. Since the diffusion fringes are formed by extending the rod in the axial direction, linear light extending in the axial direction of the rod can be obtained.

Light from components other than the component emitted as linear light is emitted from the other end face, and the light emitted from the rod is emitted in two directions, the axial direction and the end face direction. Will be done.

The emitted light can be controlled by processing or changing the shape of the other end surface.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The light source device according to the present invention will be described in detail below with reference to the drawings.

FIG. 1 shows an embodiment of a light source device according to the present invention. The light source device 10 includes a rod 12 for optical transmission.
And a casing 16 in which the slit 14 is formed and the inner peripheral surface near the slit 14 is a reflecting surface,
The lamp house 20 is fixed to the casing 16 through the base 18, and the reflector-equipped lamp 24 is fixed to the lamp house 20 by a leaf spring 22 fixed to the lamp house 20. ing.

FIG. 2 is an exploded perspective view of the light source device 10 shown in FIG. 1, in which each component is clearly shown.

The rod 12 for optical transmission has a solid and circular cross section, and the material is preferably as transparent as possible, for example, quartz glass, optical glass, silicone resin or acrylic resin. Then, on the outer peripheral surface on the side opposite to the site where the slit 14 is located, linear thin striped diffusion stripes 26 extending in the axial direction are applied. The diffusion stripes 26 are made of fine powder having a higher refractive index than the rod 12, and are made of, for example, titania, magnesia, barium sulfate or the like.

At both ends of such rod 12, FE is
A support ring 28 of P heat shrink tubing is attached. Then, a ring spacer 30 made of aluminum is fitted around the support ring 28 and disposed inside the casing 16 via the ring spacer 30. Then, the rod 12 is fixed in the casing 16 by screwing in the set screw 32 made of steel.

When it is desired to make the linearly emitted light up to the end of the rod 12, the support ring 28 and the ring spacer 30 are cut by the width of the slit 14 at the portion corresponding to the position, and A structure that does not block the emission may be used.

As described above, the casing 16 accommodating the rod 12 is fixed so that the rod 12 is coaxially inserted into the large-diameter opening 34 of the base 18, and the base 18 is screwed with the lamp 36. -By being fixed to the house 20, the casing 16 and the lamp house 2
0 will be integrated.

In the above structure, the lamp 2 with a reflecting mirror
4 causes light to enter the rod 12 from the incident end face 38 of the rod 12, the incident light is diffused fringes 26
Is diffused and reflected by the lens action of the rod 12,
A part of the incident light component is emitted from the inside of the rod 12 in the direction opposite to the diffusion fringes 26 with directivity.

That is, the light diffusely reflected by the diffusion fringes 26 and emitted from the inside of the rod 12 in the opposite direction to the diffusion fringes 26 with the directivity by the lens action of the rod 12 has the diffusion fringes 26 extended in the axial direction of the rod 12. Since it is formed as a linear light, it becomes a linear light that extends in the axial direction of the rod 12, and is emitted from the slit 14 of the casing 16 as a linear light. Further, since the inner peripheral surface near the slit 14 of the casing 16 is a reflecting surface, the light that has not passed through the slit 14 is reflected by this reflecting surface and is reflected by the rod 1.
It will be returned to within 2 and will be diffusely reflected again.

Also, from the emission end face 40 of the rod 12,
Light from a component other than the component emitted as linear light is emitted, and the emitted light from the rod 12 is emitted in two directions, the axial direction and the end face direction.

Therefore, when the light source device 10 is arranged at the corner of the L-shaped member and the lamp 24 with the reflecting mirror is turned on, for example, one of the parts branched from the corner of the L-shaped member in two vertical directions. Can irradiate light emitted from the slit 14, and the other end of the light emitting facet 40
It is possible to irradiate the emitted light from.

Next, using the light source device 10 having the above structure,
According to the experiment conducted by the applicant, the data shown in FIGS. 4 to 17 could be obtained.

In this experiment, quartz glass was used as the material of the rod 12, and the diameter (d) was 10 mm and the length (l) was 455 mm.

The material of the diffusion stripes 26 is titania fine powder, and the width is 2.1 mm and the length is 420 mm.

The material of the casing 16 is aluminum and the width of the slit is 7 mm.

For the measurement of the emitted light in the axial direction, the illuminance was measured at a point 10 mm away from the rod 12 while scanning in the axial direction.

On the other hand, with respect to the light emitted from the emission end face 40, the illuminance was measured at a point 30 mm away from the emission end face 40 of the rod 12 while being scanned in the radial direction.

First, FIGS. 4 and 5 show the case where the emission end face 40 is mirror-polished. FIG. 4 shows the emission light in the axial direction, and FIG. 5 shows the emission light from the emission end face 40.

FIGS. 6 and 7 show the case where the emitting end face 40 is finished with No. 1000 and subjected to frost processing to form a diffusing surface, and FIGS. 8 and 9 show the emitting end face 4 as well.
0 shows a case where No. 500 is finished and frost processing is applied to form a diffusion surface. It should be noted that in FIGS. 4 to 9, the emission end face 40 is a plane as shown in FIG.

As shown in FIGS. 4 to 9,
The illuminance of the outgoing light in the axial direction and the illuminance of the outgoing light from the outgoing end face 40 vary depending on the state of the outgoing end face 40.

That is, by frosting the emission end face 40, a part of the light reaching the emission end face 40 is reflected again in the rod 12 and used as an emission component from the axial direction. Therefore, as the roughness of the frosted end face 40 increases (that is, from No. 1000 finish to No. 500 finish) and the degree of diffuse reflection increases, the illuminance of the emitted light from the axial direction increases. At the same time, the illuminance of the light emitted from the emission end face 40 is reduced.

By frosting,
Variations in the light quantity distribution of the emitted light from the axial direction are reduced, and a more uniform light quantity distribution is obtained.

Therefore, by processing the emission end face 40, it is possible to control the light amount distribution of the emission light in the axial direction and the emission light from the emission end face 40.

Further, FIGS. 10 to 15 show the emission end face 4
While changing the shape of 0, 5
This is a case where a No. 00 finish and a frosting process are applied to form a diffusion surface.

That is, FIGS. 10 and 11 show the case of the plane as shown in FIG. 18, FIGS. 12 and 13 show the case of the conical shape as shown in FIG. 19, and FIGS. This is the case of a hemispherical shape as shown in FIG. In addition, in FIG. 19, the length (l ₁ ) of the conical portion is approximately 13
mm, and in FIG. 20, the length of the hemispherical portion (l ₂ ).
Is 5 mm. The light emitted from the emission end face 40 is measured by scanning at a point 30 mm from the apex of these conical or hemispherical portions.

As shown in FIGS. 10 to 15, by changing the shape of the emission end face 40, the light amount of the emission light from the emission end face 40 and the light amount distribution are significantly changed.

That is, FIG. 16 is a graph showing the emitted light from the emitting end face 40 shown in FIGS. 11, 13 and 15 by the measured value. Regarding the amount of emitted light, the emitting end face 40 has a conical shape. It has been shown that the thing that can suppress the emitted light amount most. The shape of the emission end face 40 in the order of increasing the amount of emitted light is a plane, a hemisphere, or a cone.

Further, FIG. 17 shows the light quantity distribution characteristic with the maximum value of the measured value of the light emitted from the light emitting end face 40 shown in FIGS. 11, 13 and 15 as 100%. From FIG. 17, when the emitting end surface 40 has a conical shape,
It is shown that a part of the straight traveling outgoing light that has reached the outgoing end face 40 is diffused toward the outer diameter side by the oblique diffusing surface and is emitted. The same can be said when the emission end face 40 has a hemispherical shape, but the tendency is weaker than that of the conical shape, so that the light amount distribution is substantially intermediate between the planar shape and the conical shape. Therefore, the graph is as shown in FIG.

Further, when the end face shape is concave as shown in FIG. 21, compared with the case where the end face shape is flat as shown in FIG. 22, the emission pattern is more diffused toward the outer diameter side. .

As described above, in addition to the above, the shape of the end surface can be appropriately selected from a square concave surface, an oblique cutting surface, a polygonal pyramid, and the like. By selecting these,
It is possible to obtain emitted light having different characteristics.

Further, as shown in FIG. 3, the casing 1
By using the slit 114 that is not cut out over the entire length of 16, the outgoing light from the axial direction and the outgoing end face 4
The emitted light from 0 can be separated.

[0047]

Since the present invention is constructed as described above, it has the following effects.

In a light source device including a rod for optical transmission in which a diffusion fringe extending in the axial direction is applied to the outer peripheral surface and light source means is disposed on one end surface, the other end surface of the rod is selectively polished. Formed on a surface or a diffusing surface having a different roughness, and a polishing surface or a diffusing surface having a different roughness may be appropriately selected according to the intensity of emitted light required,
The other end surface shape is selectively formed into a flat surface, a convex surface or a concave surface, and the flat surface, the convex surface or the concave surface is appropriately selected according to the required intensity of emitted light. When light is incident on the rod for optical transmission from the inside, the incident light is diffused and reflected by the diffusion fringes, and due to the lens action of the rod for optical transmission, directivity is directed from the inside of the rod to the direction opposite to the diffusion fringes. Thus, part of the incident light component is emitted, and light from components other than the component emitted as linear light is also emitted from the other end face. Can be emitted in two directions, the axial direction and the end face direction.

The emitted light can be controlled by processing or changing the shape of the other end surface.

[Brief description of drawings]

FIG. 1 is a perspective view of an overall configuration showing an embodiment of a light source device according to the present invention.

FIG. 2 is an exploded perspective view of FIG.

FIG. 3 is a perspective view showing a modified example of the casing.

FIG. 4 is a graph showing the amount of light emitted from the axial direction when the emission end face has a flat shape and is transparent (polished surface).

FIG. 5 is a graph showing the amount of light emitted from the emission end face when the emission end face has a flat shape and is transparent (polished surface).

FIG. 6 is a graph showing the amount of light emitted from the axial direction when the emission end face is a flat surface and is a frosted diffusion surface with No. 1000 finish.

FIG. 7 is a graph showing the amount of light emitted from the emission end face when the emission end face is a flat surface and is a frosted diffusion surface with No. 1000 finish.

FIG. 8 is a graph showing the amount of light emitted from the axial direction in the case where the shape of the emitting end surface is a flat surface and is a frosted diffusion surface with No. 500 finish.

FIG. 9 is a graph showing the amount of light emitted from the emission end face when the emission end face is a flat surface and is a frosted diffusion surface with No. 500 finish.

FIG. 10 is a graph showing the amount of light emitted from the axial direction when the shape of the emission end surface is a flat surface and is a frosted diffusion surface with No. 500 finish.

FIG. 11 is a graph showing the amount of light emitted from the emission end face when the emission end face is a flat surface and is a frosted diffusion surface with No. 500 finish.

FIG. 12 is a graph showing the amount of light emitted from the axial direction when the emission end face has a conical shape and is a frosted diffusion surface with No. 500 finish.

FIG. 13 is a graph showing the amount of light emitted from the emission end face when the emission end face has a conical shape and is a frosted diffusion surface with No. 500 finish.

FIG. 14 is a graph showing the amount of emitted light from the axial direction when the shape of the emitting end surface is a sphere and is a frosted diffusion surface with No. 500 finish.

FIG. 15 is a graph showing the amount of light emitted from the emission end face when the emission end face is a sphere and is a frosted diffusion surface with No. 500 finish.

16 is a graph collectively showing measured values of the graphs in FIGS. 11, 13 and 15. FIG.

FIG. 17 is a graph showing a light amount distribution when the maximum value of the measured values of each graph in FIGS. 11, 13 and 15 is set to 100%.

FIG. 18 is an explanatory diagram in the case where the emitting end surface of the rod is a flat surface.

FIG. 19 is an explanatory diagram when the emitting end surface of the rod is a cone.

FIG. 20 is an explanatory diagram in the case where the emitting end surface of the rod is a hemisphere.

FIG. 21 is an explanatory diagram of emitted light when the emitting end surface of the rod is a spherical concave surface.

FIG. 22 is an explanatory diagram of emitted light when the emitting end surface of the rod is a flat surface.

[Explanation of symbols]

 10 Light Source Device 12 Rod 14 Slit 16 Casing 18 Base 20 Lamp House 22 Leaf Spring 24 Lamp with Reflecting Mirror 26 Diffuse Stripe 28 Support Ring 30 Ring Spacer 32 Set Screw 34 Large Diameter Port 36 Screw 38 Entrance End Face 40 Emitting End Face 114 Slit 116 casing

Claims (3)

[Claims] 1. A light source device comprising a rod for optical transmission, wherein an outer peripheral surface is coated with diffusion stripes extending in the axial direction and light source means is disposed on one end surface, and the other end surface of the rod is selected. The light source device is characterized in that it is formed on a polishing surface or a diffusion surface having a different roughness, and the polishing surface or a diffusion surface having a different roughness is appropriately selected according to the required intensity of emitted light. 2. The other end face shape is a plane selectively,
The light source device according to claim 1, wherein the light source device is formed into a convex surface or a concave surface, and the flat surface, the convex surface, or the concave surface is appropriately selected according to the required intensity of emitted light. 3. The light source device according to claim 2, wherein the convex surface includes a cone or a hemisphere.