JPH03248786A - Optical beam heating machine - Google Patents

Abstract

PURPOSE:To efficiently transfer optical energy to the other position and to work a material to be worked under heating by shaping facing side to anode of a cathod in a discharging lamp to cone type and the top part thereof to semi-spherical type. CONSTITUTION:The cathode 2 has the conical part 4 and this top part 5 is made to the semi-spherical type, and arc is generated at between the top part 5 and tip part 6 of the anode 3. An optical fiber cable 11 has an optical receiving part 10 positioned at a second focus 10 in the one end and lens mechanism 13 condensing the optical energy transferred with the cable 11 to a focus 14 in the other end. The optical receiving part 12 received the optical energy condensed to the second focus 10 and transfers to the optical fiber cable 11. The material 15 to ba worked is worked under heating with the optical energy condensed to the focus 14. By this method, the optical energy having high intensity can be efficiently condensed to the optical receiving end 12 and can be effectively utilized to working under heating.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a light beam heating machine used for soldering, brazing, welding small parts, electronic parts, etc., and heating and joining plastics, resins, etc.

Conventional technology For boat fishing, a light beam heating machine focuses the light energy emitted from a discharge lamp such as a xenon lamp located at the first focus of a reflector onto the second focus of the reflector, where it is directly heated. The workpiece is heated or processed, or the light energy is transmitted to another location using an optical fiber cable and the light is focused again at that location to heat the workpiece.

Problems to be Solved by the Invention However, in the above-mentioned conventional light beam heating machine, the dispersion width of the light energy is large near the second focal point, as shown by the dotted line A in FIG. When transmitting light energy to a location, a portion of the light energy emitted from the discharge lamp will be outside the range that can be received by the optical fiber cable. Therefore, there is a problem in that the light energy emitted from the discharge lamp cannot be effectively utilized.

SUMMARY OF THE INVENTION An object of the present invention is to provide an excellent light beam heater capable of effectively utilizing the light energy emitted from a discharge lamp, which solves the above-mentioned problems.

Means for Solving the Problems In order to achieve the above object, the present invention has a cathode of a discharge lamp whose side facing the anode is shaped into a conical shape, and the top of the cone is shaped into a hemispherical shape, and the cathode and anode are shaped into a hemispherical shape. The bright spot that generates the strongest light of the arc generated between the two is located at the first focal point of the reflecting mirror.

Therefore, according to the present invention, the strongest light energy is emitted from the bright spot located at the first focal point, reflected by the reflecting mirror, and concentrated within an extremely narrow range near the second focal point. have

Embodiment FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 2 is a front view of essential parts of the embodiment. 1 in Figures 1 and 2
2. A discharge lamp that is lit with direct current, such as a xenon lamp.
3 are the cathode and anode of the discharge lamp, respectively. Cathode 2
has a conical part 4, the top part 5 of which is semi-spherical, and generates an arc 7 between it and the tip part 6 of the anode 3. 8
is the bright spot that emits the strongest light energy,
By positioning it at the first focal point 16 of the reflecting mirror 9 such as an elliptical reflecting mirror, the light energy can be effectively focused even if it is located at the second focal point 10 of the reflecting mirror 9. Reference numeral 11 denotes an optical fiber cable, which has a light receiving section 12 located at a second focal point 10 at one end, and a lens mechanism 13 that focuses the light energy transmitted by the optical fiber cable 11 at a focal point 14 at the other end. Reference numeral 12 denotes a light receiving section, which receives the optical energy focused on the second focal point 10 and sends it to the optical fiber cable 11. The workpiece 15 is heated and processed by the light energy focused on the focal point 14. θ is the apex angle of the conical portion 4, which is set to 30° in this embodiment.

Further, r is the radius of the hemispherical top 5.

Here, FIG. 3 shows the relationship between the distance from the second focal point and the intensity of the optical energy condensed in the vicinity of the second focal point in this embodiment and an example of a conventional optical beam heating machine. It is a diagram. The dotted line A in Fig. 3 is the conventional example, and the solid line B
1 shows the present embodiment, and as can be seen from the figure, it is clear that in this embodiment, high-intensity light energy is concentrated within the radius R from the second focal point.

Furthermore, in order for the light energy to be effectively focused within the radius R from the second focal point 10, it must be emitted from within the radius rl from the first focal point, but the relationship between R and rl is When R=1.5 mm, rl=0.25 mm. In other words, in this embodiment, since the bright spot part 8 is provided at the first focal point 10, by making the radius of the bright spot part 8 less than or equal to r1, intense light energy is concentrated within the radius R from the second focal point 10. It can be made to shine. Furthermore, the bright spot portion 8 of the arc 7
The radius r1 of and the radius r of the top 5 are in a close relationship, and as r increases, rl also increases accordingly.
When the apex angle θ of the conical portion 4 is made small, rl and r become close values. However, if the apex angle θ is too small, the apex portion 5 will be easily worn out, so as a result of experiments, it was found that 25° to 40° is an appropriate range, and in this example, the apex angle θ was set to 30°. be.

As described above, according to this embodiment, it is possible to efficiently focus high-intensity light energy on the light receiving end 12 of the optical fiber cable 11 installed at the second focal point 10, so that the light emitted from the discharge lamp This has the effect that energy can be effectively used for heating processing of the workpiece.

Effects of the Invention As is clear from the above embodiments, the present invention has the anode side of the cathode of the discharge lamp shaped into a conical shape, and the top of which is shaped into a hemispherical shape. By reducing the dispersion width, the optical fiber cable receives light energy efficiently, which has the effect of efficiently transmitting the light energy emitted by the discharge lamp to other parts and heating the workpiece. has.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, FIG. 2 is a front view of the main parts of this embodiment, and FIG. 3 is a second focal point in this embodiment and an example of a conventional light beam heating machine. It is a characteristic diagram which shows the relationship between the distance from the second focal point of the light energy condensed in , and the intensity of the light energy. 1...Discharge lamp, 2...Cathode, 3.
... Anode, 4 ... Conical part, 5 ...
... Top, 6 ... Tip, 7 ... Arc, 8 ... Bright spot, 9 ... Reflector, 1
0...Second focal point, 11...Optical fiber cable, 12...Light receiving end, 13 Lens mechanism, 14...Focus, 15...・Workpiece,
16...First focus. Discharge lamp 0 11 Futaku A basic! Rebellion? (4L η dirt Z!j!, ta, optical fiber cable

Claims (1)

[Claims] (1) a discharge lamp that is lit with direct current; a reflector that reflects the light emitted from the discharge lamp and focuses it on a second focal point;
and a transmission means for transmitting the light energy concentrated at the second focal point to another location using an optical fiber cable, the cathode of the discharge lamp;
The side facing the anode is shaped into a cone, and the top of the cone is shaped into a hemisphere so that the top faces the anode to generate the strongest light from the arc generated between the cathode and the anode. A light beam heating device characterized in that a bright spot portion is located at a first focal point of the reflecting mirror. (2) The apex angle of the conical part of the cathode of the discharge lamp is 25° to 40°, and the radius of the hemispherical apex of the cathode is set to direct the light energy into the light-receivable area of the optical fiber cable at the second focal point. 2. The light beam heating device according to claim 1, wherein the radius is equal to the radius of the bright spot, which is a sufficient condition for condensing the light.