JPH0422323Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to an annular light condensing device, and in particular, it divides one luminous flux and focuses it into a plurality of annular beams, and the interval and diameter of the two beams are variable. The present invention relates to an annular light condensing device that can be used as a condenser.

[Prior art and its problems] In general, a conventional annular condensing device is designed as shown in FIG.
0 and further through a condensing lens (convex lens) 31 to perform annular condensation.

However, in this case, the annular condensed light is single and the diameter of the annular condensed light is uniform.
To obtain annular condensed light of different diameters from the same light source,
The lens needed to be replaced.

Therefore, when separating the annular object from the burrs attached to it, such as when finishing the annular object, the laser beam must be separately focused on the inner diameter side and the outer diameter side, and For this purpose, it was necessary to prepare two condensing lenses 31, one for the inner diameter and one for the outer diameter, and it was time-consuming because they could not be used at the same time.

Furthermore, in order to accommodate various diameters, lenses had to be arranged for each diameter.

As mentioned above, in the case of the conventional annular concentrator,
This method has problems in that it is not possible to condense a plurality of annular lights at the same time, the diameter of the annular light condensers cannot be changed freely, and furthermore, the interval between the annular lights cannot be changed.

In view of the above-mentioned problems, the present invention has developed an annular condensing device that can condense multiple annular lights at the same time, freely change the diameter of the condensing ring steplessly, and freely change the interval between the annular condensing rings. The purpose is to provide.

[Means for solving problems]

In order to solve the above-mentioned problems, the present invention includes a light guide tube for passing a cylindrical parallel light beam, and a cylindrical parallel light beam attached to the tip of the light guide tube and arranged in a direction perpendicular to the optical axis of the cylindrical parallel light beam. a first condensing device comprising a hollow right conical truncated mirror that reflects a part of the light flux and the rest traveling straight; and an annular condensing lens that is provided surrounding the hollow right conical truncated mirror and receives the reflected light; , a right conical mirror connected to the first condensing device by a gap adjuster and reflecting the light traveling straight through the first condensing device in a direction perpendicular to the optical axis; and a right conical mirror provided surrounding the right conical mirror. a second condenser consisting of an annular condenser lens into which the reflected light enters; and a second condenser comprising an annular condenser lens that receives the reflected light; and a hollow truncated conical reflecting plate that reflects light parallel to the optical axis, and the light guide tube is configured to be movable in the optical axis direction with respect to the hollow truncated conical reflecting plate.

[Effect]

Since the present invention employs the above-mentioned means, it is possible to simultaneously obtain a plurality of annular light condensers whose diameters and intervals can be freely changed within the range of the aperture of the hollow truncated conical reflector.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an annular light condensing device according to the present invention, in which the light guide tube 1 is formed entirely in a cylindrical shape, and is movable in the axial direction by a drive device (not shown). It is connected to an irradiation device (not shown) for the cylindrical parallel light beam 2 to guide the cylindrical parallel light beam 2 irradiated by the irradiation device, and a first condenser is provided at the lower end.

In the first condensing device, an annular condensing lens (toroidal lens) 6 having a constant radius of curvature is fixed to the outer peripheral surface of the lens holder 13a, and a sloped surface located at the center of the annular condensing lens (toroidal lens) 6 is fixed to the outer peripheral surface of the lens holder 13a. A hollow right truncated conical mirror 3 with an elevation angle of 45° is provided on the holding portion 13c, and the hollow right truncated conical mirror 3 is mounted on the lens holder 13a, with the center thereof being
It is arranged so as to coincide with the center of the hole 13b opened thereunder, and also with the center of the annular condensing lens 6, and with the optical axis O of the cylindrical parallel light beam 2. It's summery.

A second light collecting device 14 is connected below the first light collecting device by a gap adjuster 16 made of a screw or a mini-cylinder.

The second light condensing device 14 has a hole 14 in the center on the outer peripheral surface.
There is a ceiling part 14c with d open, and the lower part is the holding part 1.
4b. A lens holder 14a is formed from the ceiling part 14c and the holding part 14b, and a ring-shaped condenser lens (toroidal lens) having the same radius of curvature as that of the annular condenser lens 6 of the first condenser 13 is formed here. ) 11 is fitted,
The diameter of this annular condensing lens 11 is also the same as that of the first condensing device 13.
The diameter is the same as that of the annular condensing lens 6.

At the center of the holding part 14b, the top angle is 90°.
A right conical mirror 10 is located, and the center of this right conical mirror 10 coincides with the center of the hole 14d in the ceiling and the center of the annular condensing lens 11, and the light of the cylindrical parallel light beam 2 is located. It also coincides with axis O.

The first condensing device 13 and the second condensing device 14 are covered by a hollow truncated cone-shaped reflecting plate 7, the upper and lower ends of which are open.
It is formed in the shape of a hollow right circular cone with an elevation angle of 45 degrees at its lower end, and its inner peripheral surface is a mirror surface. Coincident with the axis O, a cylindrical holding member 15 is connected to the upper end and fixedly held.

Therefore, by moving the light guide tube 1 in its axial direction by a driving device (not shown), the light guide tube 1 and the first light condensing device 13 connected thereto are
and the second condensing device 14 are adapted to move together in the axial direction of the hollow truncated conical reflecting plate 7.

Therefore, in the annular condensing device configured as described above, the irradiation device produces a cylindrical parallel light beam 2.
When irradiated, the cylindrical parallel light beam 2 travels inside the light guide tube 1 in the direction of the optical axis O of the cylindrical parallel light beam, that is, in the vertical direction, as shown by the dotted line in FIG.
First, it enters the first condensing device 13 and is reflected by the hollow right circular truncated conical mirror 3 on the slope of the hollow right circular truncated circular conical mirror 3 to form a disk shape in the horizontal direction. The light beam is directed into a disk-shaped reflected light beam 4, and further, this disk-shaped reflected light beam is perpendicularly incident on an annular condensing lens (toroidal lens) 6.

The disc-shaped reflected light beam 4 entering the annular condensing lens 6 is condensed by the annular condensing lens 6, reflected by the hollow truncated conical reflector 7, and directed in the vertical direction to the irradiated surface. The light is condensed at an annular focal point 9.

At this time, the distance from which the cylindrical parallel light beam 2 is reflected by the hollow right conical truncated mirror 3 to the annular condensing lens 6, and the distance from which the cylindrical parallel light beam 2 exits the annular condensing lens 6 and is reflected by the hollow truncated conical reflecting plate 7 is determined. When considering the distance from the hollow truncated conical reflector 7 to the irradiated surface 8, the hollow right truncated conical mirror 3
The angle of reflection by the hollow truncated conical reflector 7 is
Since the angle is 90°, especially for the latter, the distance connected by going straight and the distance connected by reflection are equal, and the distance from the annular condensing lens 6 to the hollow truncated conical reflector 7 and the hollow truncated conical reflector The sum of the distances reflected by 7 and connected to the irradiated surface 8 is always constant. Therefore, once the irradiated surface 8 is positioned, the first condensing device 1
3 is moved up and down, the focus is always on the irradiated surface 8.

The diameter of the annular focal point 9 is determined by the distance from which the cylindrical parallel light beam 2 is reflected by the hollow truncated conical mirror 3 to the annular condenser lens 6, and the distance from which the cylindrical parallel light beam 2 is reflected from the annular condenser lens 6. and the distance from the optical axis O of the cylindrical parallel light beam 2 to being reflected by the hollow right circular truncated cone mirror 3; The optical axis of the reflected light beam 4 becomes the sum of the distances to the point where it touches the slope of the hollow right circular truncated conical mirror 3.

Therefore, the center of the annular focal point 9 coincides with the optical axis O of the cylindrical parallel light beam 2, and by moving the light guide tube 1 with respect to the holding member 15, the annular condenser lens Since the distance from the hollow truncated conical reflector 7 to the hollow truncated conical reflector 7 changes steplessly, the diameter of the annular focal point 9 varies steplessly within the range of the upper and lower aperture diameters of the hollow truncated conical reflector 7. can change to.

Next, the light beam at the center of the cylindrical parallel light beam, the straight light beam 5, which has traveled straight through the hollow right conical truncated mirror 3 in the first condensing device 13, passes through the hole 13b made in the holding portion 13c, The light enters the second light condensing device 14 in the vertical direction through a hole 14d formed in the ceiling portion 14c.

The incident rectilinear light beam 5 is reflected by a right conical mirror 10 and directed in the horizontal direction into a disk-shaped reflected light beam 5a.Furthermore, this disk-shaped reflected light beam 5a is formed by an annular condensing lens (toroidal lens). ) is incident perpendicularly to 11.

The disc-shaped reflected light beam 5a that has entered the annular condenser lens 11 is condensed by the annular condenser lens 11, travels straight as it is, intersects with the light beam obtained by the first condenser 13, and further travels straight. The light is reflected by the hollow truncated conical reflector 7 and directed in the vertical direction to form an annular focal point 12 on the irradiated surface.

As described above, the second condenser 14 also condenses the light into an annular shape in the same manner as described for the first condenser 13. Since the distance from the light condensing by the lens 11 to being reflected by the hollow truncated conical reflector 7 is longer than that by the first condensing device 13, the annular shape obtained by the second condensing device 14 is The diameter of the focal point 12 is the annular focal point 9 obtained by the first condensing device 13.
The annular focus 12 is outside the annular focus 9.

Similarly, the center of the annular focal point 12 coincides with the optical axis O of the cylindrical parallel light beam 2.

Furthermore, for the same reason as explained in detail in the case of the first condensing device 13, even when the light guide tube 1 is moved up and down with respect to the holding member 15, the irradiated surface 8 is always kept in focus. In addition, the diameter of the annular focal point 12 can be changed steplessly in the range from the upper opening diameter to the lower opening diameter of the hollow truncated conical reflector 7, and the annular focal point 12 is always located outside the annular focal point 9. This results in a double annular focus.

Note that by adjusting the gap adjuster 16 provided between the first light collecting device 13 and the second light collecting device 14, the distance between the first light collecting device 13 and the second light collecting device 14 can be increased. The distance between the annular focal points 9 and 12 can be changed accordingly.

Next, a second embodiment shown in FIG. 2 will be described.

The configuration of the second embodiment is the same as that of the first embodiment.
A second first light collecting device 18 is arranged between the light collecting device 13 and the second light collecting device 14.

Note that this second first condensing device 18 has a lens holder 18a having a ceiling portion 18e with a hole 18b in the center.
and the lens holder 13 of the first condensing device 13
A gap adjuster 16 is provided between the lens holder 18a and the lens holder 14a of the second condensing device 14, and a gap adjuster 21 is also provided between the lens holder 18a and the lens holder 14a of the second condensing device 14.

Further, the ceiling portion 1 of the second first light condensing device 18
8e and holes 18b and 18d bored in the holding part 18c
Furthermore, the center of the internal hollow right circular truncated conical mirror 17 coincides with the center of the annular condenser lens 20 and also coincides with the optical axis O of the cylindrical parallel light beam 2.

In addition, in order to separate the straight light beam 5 traveling straight through the first light condensing device 13 into a reflected light beam 23 and a straight light beam 22, the diameter of the upper surface and the bottom surface of the hollow truncated conical mirror 17 are the same as those of the first light condensing device 13. It is smaller than the hollow right conical truncated mirror 3.

Furthermore, the right conical mirror 10 of the second condensing device 14 that reflects the straight light beam 22 traveling straight through the second first condensing device 18 has a smaller diameter at the bottom than in the first embodiment.

Further, the diameters of the annular condensing lenses 6, 20, and 11 are equal, and the other configurations are the same as those of the first embodiment.

In the annular light condensing device configured as described above, when the light guide tube 1 is moved relative to the holding member 15, as described in the first embodiment, the annular focal points 9, 19, 12 are formed on the irradiated surface 8. As it is tied, its diameter increases or decreases steplessly.

At this time as well, the annular focal point 19 is located outside the annular focal point 9, and the annular focal point 12 is located further outside of the annular focal point 9. At this time, the diameter of each annular focus can be set to have a maximum diameter equal to the lower surface diameter and a minimum diameter equal to the upper surface diameter of the hollow truncated conical reflecting plate 7. Further, the centers of the respective annular focal points 9, 19, 12 coincide with the optical axis O of the cylindrical parallel light beam 2.

Further, by adjusting the gap adjusters 16 and 21, the distance between the annular focal points 9 and 19 can be adjusted.
The distance between and 12 narrows and widens.

Although the irradiation device has not been specified above, when a laser is used, the effect is the same as described above, and the ratio of energy density at the focal point is the same as that of the hollow right truncated conical mirror of the cylindrical laser parallel beam 2. It is determined by the area ratio of the reflecting part and the straight-going part according to No. 3 and 17. However, even in this case, the energy distribution of the cylindrical parallel laser beam is uniform.

[Effect of idea]

As described above, the present invention has a light guide tube connected to a cylindrical parallel light beam irradiation device, which is connected to a first concentrator, a second condenser, and a second condenser.
By providing the light condensing device, the first light condensing device and the second light concentrating device
The condensing device has a hollow right conical truncated mirror and a right conical mirror disposed at the center of each annular condensing lens, so the cylindrical parallel light beam irradiated by the irradiation device is directed in the direction of its optical axis. , that is, it travels in the vertical direction, is reflected by the hollow right conical truncated mirror and the right conical mirror, is directed in the horizontal direction, becomes a disc-shaped light beam, enters the annular condenser lens, and enters the annular condenser lens. As a result, the light is condensed to become a disc-shaped focused light, and is reflected by a hollow truncated cone-shaped reflector to become annular focused light, so that the irradiated surface can also be brought to a plurality of annular focal points.

Further, by making the first light collecting device and the second light collecting device movable in their axial directions with respect to the hollow truncated conical reflecting plate, the first light collecting device and the second light collecting device can be moved. When moving, the position of reflection by the hollow truncated conical reflector of the disc-shaped convergent light condensed by the annular condensing lenses in the first condensing device and the second condensing device changes arbitrarily. This means that the radius of the plurality of annular focal points when the parallel light beam is annularly condensed onto the irradiated surface perpendicular to the optical axis can be changed steplessly.

Further, by adjusting the gap adjuster between the light condensing devices, the intervals between the plurality of annular focal points can be arbitrarily changed.

Furthermore, when a laser beam is used as a cylindrical parallel light beam, for example, when cutting the inner and outer diameters such as separating O-rings and burrs, it is possible to cut the inner and outer diameters at the same time, shortening processing time, and providing excellent versatility. It is effective.

[Brief explanation of the drawing]

Fig. 1 is a schematic longitudinal sectional view showing an embodiment of the annular light condensing device of the present invention, Fig. 2 is a schematic longitudinal sectional view showing the second embodiment, and Fig. 3 is a schematic longitudinal sectional view showing a conventional annular light condensing lens combination. FIG. 1...Light guide tube, 2...Cylindrical parallel light beam, 3,1
7... Hollow right conical truncated mirror, 4, 5a, 23,
24... Reflected light flux, 5, 22... Straight light flux, 6,
11, 20...Annular condensing lens, 7...Hollow truncated conical reflector, 8...Irradiated surface, 9, 12, 19...
...Focal point, 10...Right circular conical mirror, 13, 18...
...First condenser, 13a, 14a, 18a... Lens holder, 13b, 14d, 18b... Hole,
13c, 14b, 18c...Holding part, 14...Second condensing device, 14c, 18e...Ceiling part, 15...
...Holding member, 16, 21... Gap adjuster, 30...
... Conical lens (conical lens), 31 ... Condensing lens (convex lens), O ... Optical axis.

Claims (1)

[Scope of utility model registration request] A light guide tube 1 for passing the cylindrical parallel light beam 2;
The cylindrical parallel light beam 2 is directed perpendicularly to the optical axis O of
A first condenser consisting of a hollow right conical truncated mirror 3 that reflects a part of the light and the rest that goes straight, and an annular condenser lens 6 that is provided surrounding the hollow right conical truncated mirror 3 and receives the reflected light. a device 13 connected to the first condensing device 13 by a gap adjuster 16;
A right conical mirror 10 that reflects the light traveling straight through the condenser 13 in a direction perpendicular to the optical axis O, and an annular condenser lens 11 that is provided surrounding the right conical mirror 10 and receives the reflected light. and the annular condensing lenses 6 and 11 of the first condensing device 13 and the second condensing device 14 in parallel to the optical axis of the cylindrical parallel light beam 2. 1. An annular light condensing device comprising a hollow truncated conical reflector 7 for reflection, and the light guide tube 1 is movable in the optical axis O direction with respect to the hollow truncated conical reflector 7.