JPH04113185U - light heating device - Google Patents

Abstract

(57) [Summary] [Purpose] In an optical heating device using optical fiber,
To prevent an optical fiber or a shutter plate from rising in temperature above a heat-resistant temperature, and to prevent an apparatus from increasing in size. [Configuration] The input end face 31 of the optical fiber 3 and the input end face 3
a shutter plate 41 for blocking light on the optical path before it enters the optical path; and a shutter drive mechanism 40 for arranging the shutter plate 41 on the optical path and retracting it from the optical path.
A cooling fan 7 is provided to send cooling air for cooling.
In addition, if necessary, the entrance part holder 5 that holds the entrance part 32 of the optical fiber 3 may hold the entrance part 32 with a gap, and the entrance part holder 5 may have a ventilation hole for cooling air to pass through. 521 and 522 are provided.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention is a type of optical heating device that performs radiant heating using light, such as a xenon lamp. A high-brightness, high-output light source is used, and the light from this light source is guided through an optical fiber. The present invention relates to a light heating device that irradiates light.

0002

[Conventional technology]

Heating objects by radiant heating using light has been practiced for a long time, but recently It also has many applications in industrial processes. For example, soldering electronic components to printed wiring boards, curing thermosetting resin, It also covers a wide range of areas, including welding plastics.

0003 Radiant heating using light is preferably used for Since heating can be performed without contact, there is no risk of contamination of the heated object. You can heat only the parts you want to heat. Good controllability. It can be heated instantly. This is because of the following reasons.

0004 The above-mentioned optical heating device must be able to freely heat a desired location away from the light source. Due to these demands, recently optical fibers have been developed that condense the light from the light source. An optical heating device is known in which light is introduced into an optical fiber and irradiated by being guided by the optical fiber. Ru.

[0005] FIG. 3 is a schematic explanatory diagram of a conventional optical heating device using an optical fiber. Figure 3 The optical heating device includes an elliptical condensing mirror 1 and a light emitting section 21 located at the first focal point 10 of the elliptical condensing mirror 1. The light source 2 is arranged so that the incident end face 31 is the second focal point of the elliptical condensing mirror 1. The optical fiber 3 arranged at the position 15 and the hand that enters the input end surface 31 It is composed of a shutter plate 41 and the like for blocking light on the front optical path.

[0006] In the optical heating device shown in FIG. The light is focused at the second focal point 15, and the optical fiber is emitted from the incident end face 31 located at the second focal point 15. incident on bar 3. The incident light is guided by the optical fiber 3 and then output. The light is emitted from the radiation end surface 36 and irradiated onto the object to be heated 8, thereby heating the object to be heated 8. In addition, the heating and heating stop control is performed using the light on the light source side of the input end face 31 of the optical fiber 3. This can be done by placing the shutter plate 41 on the road or retracting it from the optical path. be exposed.

[0007]

[Problem that the idea aims to solve]

One of the issues with optical heating devices using the above optical fibers is the heat resistance of the optical fibers. Gender can be mentioned. As is well known, in silica-based optical fiber, the heat resistance of the strand itself is poor. However, the heat resistance of the adhesive used to bundle the wires is generally low, and as mentioned above, This is an obstacle to the application of optical fibers to optical heating devices.

[0008] Also, the input diameter of the optical fiber is quite small for the entire bundle, so the optical fiber In order for the light from the light source to enter the fiber, it must be focused into a fairly small diameter. No. On the other hand, since the light source is a heating source, one with the highest possible output is used, and in the end, The energy density at the input end face of an optical fiber must be quite high. Unfortunately, the heat resistance often exceeds that of the optical fiber.

[0009] Furthermore, to control heating and heating stop, a shutter plate is placed in the optical path as described above. The light source is turned on even while the heating is stopped, and the light source is removed. As the light is irradiated onto the shutter plate, the heat applied to the shutter plate is considerable. Become. Therefore, if you place too much emphasis on heating efficiency and use a high-output light source, the shutter plate will There is a risk that the temperature will rise sharply and cause damage such as deformation of the shutter plate.

0010 On the other hand, an industrial optical heating device like the one in this application can be installed on existing production equipment in a factory. Since the equipment is often installed in addition to the equipment, it is not desirable for the equipment to become large.

[0011] The present invention was developed in consideration of the above issues, namely, the use of optical fibers. In the optical heating device used, the temperature of the optical fiber and shutter plate rises above the heat-resistant temperature. The purpose is to prevent this from happening and to prevent the device from becoming larger.

0012

[Means to solve the problem]

In order to achieve the above object, the optical heating device according to claim 1 of the present application includes an elliptical condensing mirror and a light source having a light emitting part placed at the first focal point of the elliptical condenser; and an elliptical condenser. an optical fiber having an entrance end face located at the second focal point of the optical fiber; A shutter plate placed on the optical path, and a shutter plate placed on the optical path. A shutter drive mechanism for evacuation from the entrance surface, a shutter plate, and a shutter drive mechanism. The cooling mechanism includes a cooling fan that sends cooling air to the cooling mechanism and cools the cooling mechanism.

[0013] Further, the optical heating device according to claim 2 of the present application is the optical heating device according to claim 1, wherein: An input section holder is provided to hold an input section of an optical fiber having an input end surface. The entrance part holder holds the entrance part of the optical fiber with a gap, and also holds the entrance part of the optical fiber with a gap. The entrance part holder has a ventilation hole through which the cooling air from the cooling fan passes. It is something that is established.

[0014]

【Example】

Examples of the present invention will be described below. FIG. 1 is a plan view for explaining the outline of the optical heating device according to the embodiment of the present invention. FIG. 2 is a side view of the optical heating device of FIG. 1. The optical heating device shown in Figures 1 and 2 is a bowl-shaped device installed so that the optical axis is horizontal. The light emitting unit 21 is located at the first focal point 10 of the elliptical condensing mirror 1 and the elliptical condensing mirror 1. The second focal point 15 of the elliptical condensing mirror 1 has a light source 2 provided as shown in FIG. The optical fiber 3 is arranged such that its input end face 31 is located at the position of a shutter plate 41 for blocking light on the optical path before it enters the surface 31; A shutter drive for arranging the shutter plate 41 on the optical path and retracting it from the optical path. Viewing the moving mechanism 40, the entrance end surface 31, the shutter plate 41, and the shutter drive mechanism 40 A cooling fan 7 provided at a position and an input section that holds the input section 32 of the optical fiber 3 It is composed of a holder 5, a casing 6 for housing these members, and the like.

[0015] The elliptical condenser mirror 1 has its front aperture facing the input end face 31 of the optical fiber 3. It is held by a condensing mirror holder 11. This condensing mirror holder 11 is It is fixed to the inner surface of the ring 6.

[0016] In this embodiment, the light source 2 has a strong emission spectral distribution from the visible region to the infrared region. A xenon short arc lamp is used, which has a lower power consumption is 500W. This xenon short arc lamp has a small light emitting part 21. Therefore, it is possible to condense the light into an extremely small beam at the second focal point using the elliptical condenser mirror 1. can. Therefore, it is not suitable for light source devices using optical fibers like this example. be. The light source 2 made of this xenon short arc lamp has a spherical bulge in the center. A long tube body 22 having a diameter of 23 and a tube body 22 disposed facing each other inside the bulging portion 23 are Consisting of a pair of discharge electrodes 24 and caps 25 and 26 provided at both ends of the tube body 22 has been done. The space facing the discharge electrode 24 is the discharge part, that is, the light emitting part 21, and the space facing the discharge electrode 24 is the discharge part, that is, the light emitting part 21, The source 2 is arranged so that the light emitting part 21 is located at the first focal point 10 of the elliptical condenser mirror 1. It will be done.

[0017] That is, the light source 2 has one base 25 fixed to the lamp holder 27, and the light source 2 has one base 25 fixed to the lamp holder 27. The tube body 22 extends from the outlet 23 to the base 25 fixed to the lamp holder 27. The part is inserted through the bottom opening 12 provided at the bottom of the bowl-shaped elliptical condensing mirror 1. It is installed as follows. The lamp holder 27 has a three-dimensional position adjustment mechanism 28. The position of the light source 2 can be adjusted by operating this three-dimensional position adjustment mechanism 28. Furthermore, the position of the light emitting section 21 can be adjusted three-dimensionally. Furthermore, Lamphol The holder 27 has a power supply section for the light source 2, and the other cap 26 has a power supply section. A lead wire 29 is attached.

[0018] The optical fiber 3 has a flexible portion 33 covering the bundle with a flexible cover and a bundle. The input part 32 and the output part 34 have a structure in which both ends of the dollar are covered with non-flexible metal fittings, and It is composed of an output lens unit 35 that is connected to the output side of the output section 34 .

[0019] Further, the casing 6 at a position facing the light source 2 has an input section 32 for the optical fiber 3. A hole is provided for fixing the input part holder 5 to the casing 6. It is fixed to the casing 6 so as to be inserted into the optical fiber hole. The entrance part 32 of the optical fiber 3 has a cylindrical shape, and the entrance part holder 5 It has a cylindrical shape so as to be able to hold the cylindrical incident section 32. This cylindrical incidence The part holder 5 has an inner diameter that almost matches the outer diameter of the entrance part 32 and is in contact with the entrance part 32. It has a contact part 55 to be touched and an inner diameter somewhat larger than the outer diameter of the incidence part 32, and when holding A gap holding part 56 having a gap formed between the incident part 32 and the gap holding part 56 It is comprised of a back wall 53 provided so as to close the tube at the end. Fixed to casing 6 It is the contact portion 55 that is defined, and the gap holding portion 56 and the back wall 53 are defined by the case. located within the thing 6. In addition, the gap holding part 56 includes an incident part holder 5. Ventilation holes 521 and 522 are provided at the top and bottom to allow cooling air to flow inside. ing. Note that a window 531 is provided in the back wall 53 to introduce light to the incident end surface 31. I'm being kicked.

[0020] In addition, it is possible to penetrate the thick part of the entrance part holder 5 that is exposed outside the casing 6. The setscrews 51 are screwed together in such a manner as to be screwed together. The circumferential surface of the cylindrical entrance section 32 has an upper surface. The input part 32 of the recording optical fiber 3 is inserted into the holder, and the input end face 31 is placed in the input part holder. When it hits the back wall 53 of the driver 5, the tip of the set screw 51 enters and engages. A possible set screw recess 321 is provided. When holding the optical fiber 3 in this entrance part holder 5, the entrance part 32 is The entrance end face 31 of the front end is brought into contact with the back wall 53. this state Then, the entrance is adjusted so that the entrance end face 31 is located at the second focal point 15 of the elliptical condenser mirror 1. The part holder 5 is fixed to the casing 6 in a predetermined positional relationship with respect to the elliptical condenser mirror 1. ing. Therefore, the entrance end surface 31 should be brought into contact with the back wall 53 of the entrance section holder 5. Then, turn the set screw 51 to fit it into the set screw recess 321 of the input section 32. Optical positioning of the entrance end face 31 is performed. That is, the position of the second focal point of the elliptical condensing mirror 1 held in place.

[0021] The shutter drive mechanism 40 includes a shutter shaft 42 that pivotally supports a shutter plate 41, and a shutter shaft 42 that pivotally supports a shutter plate 41. The shutter plate 41 is swung around the shutter shaft 42 in a plane perpendicular to the optical axis. A first rotor for arranging the shutter plate 41 on the optical path and retracting it from the optical path. It is composed of a Lee solenoid 42. Then, the shutter shaft 42 and the first rotor The Lee solenoid 43 is attached to a mounting plate (not shown) fixed to the casing 6. It is being

[0022] Furthermore, in this embodiment, in order to adjust the heating temperature of the object to be heated 8, the shutter plate 4 1 and a light attenuating plate 44 is provided. This light attenuating plate 44 consists of a large number of small parts on a metal plate. It has a structure with a small light transmission aperture, and like the shutter plate 41, it is perpendicular to the optical axis. It is arranged so that it can swing within a plane. That is, the light attenuation plate 44 is The attenuation plate shaft 45 is pivoted and the attenuation plate shaft 45 is rotated by a certain angle to swing the attenuation plate 44. A second rotary solenoid 46 is provided.

[0023] The cooling fan 7 is configured to cool the input end face 31 of the optical fiber 3 and the lower part of the shutter plate 41. A position where cooling air can be sent directly to the end face 31, the shutter plate 41, and the shutter drive mechanism 40 and is fixed to the bottom 61 of the casing 6. The cooling fan 7 In this embodiment, it is a blower type axial fan that blows air into the casing 6, and therefore, A cooling air inlet 610 is provided at the bottom of the casing 6 to which the cooling fan 7 is fixed. It is being On the other hand, a position facing the elliptical condenser mirror 1 on both sides 62 of the casing 6 A cooling air outlet 620 is provided in the. Therefore, the cooling fan 7 blows cooling air into the casing 6 from the inlet 610. The input end face 31 of the optical fiber 3, the shutter plate 41, the shutter shaft 42, and the - Cools the tally solenoid 43, etc. At that time, some of the cooling air flows into the entrance part holder. -5 into the entrance part holder 5 from the lower ventilation hole 521, and flows along the entrance part 32. After cooling the entrance portion 32, it flows out from the upper ventilation port 522. these After that, the cooling air cools the light source 2 and the elliptical collector mirror 1, and then blows the cooling air to both sides of the casing 6. The cooling air is discharged to the outside of the casing 6 from the cooling air outlet 620 .

[0024] Note that a control device (not shown) is provided to control the cooling fan 7, and the light source The cooling fan 7 is controlled to have an optimum cooling air volume according to the lighting conditions of No. 1.

[0025] In the optical heating device having the above configuration, when using the optical heating device, as described above, The entrance part 32 of the fiber 3 is held by the entrance part holder 5, and the entrance end face 31 is elliptical. It is positioned at the second focal point 15 of the mirror 1. On the other hand, the output part 34 of the optical fiber 3 is emitted from the output lens unit 35. The object to be heated 8 is placed in a position where it is irradiated with light.

[0026] First, as described above, the light emitting unit 21 is located at the first focal point 10 of the elliptical condensing mirror 1. Power is supplied to the light source 2 arranged so as to turn it on. Then, not shown The control device operates and the cooling fan 7 starts operating to begin cooling. When the processing start signal is not sent from the control device, the shutter plate 41 is placed on the optical path. Therefore, the light from the light source 2 focused by the elliptical collector mirror 1 is The shutter plate 41 in front of the second focal point 15 is irradiated. Therefore, the shutter plate 41 Although it heats up quite a bit, it is cooled down by the cooling air sent from the cooling fan and has a heat-resistant temperature. It is designed to prevent the temperature from rising above 30°F.

[0027] Then, a processing start signal is sent from the control device by an external signal etc. to the first rotary solenoid. When the signal is sent to the noid 43, the first rotary solenoid 43 is driven and the shutter is activated. The plate 43 is retracted from the optical path. As a result, the light source 2 focused by the elliptical focusing mirror 1 The light enters the optical fiber 3 from the input end face 31. The incident light passes through an optical fiber. After being guided by the bar 3, the light is emitted from the emitting section 34, and is emitted into the emitting lens unit 35. After being focused again by the lens, the object to be heated 8 is irradiated with the light. In this state, the light narrowed by the elliptical condenser mirror 1 illuminates the incident end face 31. Therefore, a considerable amount of heat is applied to the entrance end surface 31 and the entrance section 32, but as mentioned above, Cooling by the cooling fan 7 prevents the temperature from rising above the heat-resistant temperature.

[0028] If it is necessary to adjust the heating temperature, place a dimming plate 44 on the optical path. The illuminance on the surface of the object to be heated 8 is adjusted. At this time as well, the light attenuating plate 44 Like the shutter plate 41, the cooling fan 7, it is possible to prevent the temperature from rising above the allowable temperature.

[0029] Further, in the above embodiment, the positions of the shutter plate 41 and the light reduction plate 44 are as follows. It is preferable to arrange it as close to the entrance end surface 31 as possible. Because not much As the distance from the incident end surface 31 increases, the size of the beam of light to be blocked increases, so the shield If the shutter plate 41 etc. becomes large and the shutter drive mechanism 40 etc. also becomes large-scale. This is because it is inevitable. Also, the shutter plate 41 etc. should be brought close to the entrance end face 31. If the cooling fan 7 blows air, the space to be cooled can be made smaller. There is no need to increase the size of 7.

[0030] As is clear from the above description, in the above embodiment, the flow from outside the casing 6 is The incoming cooling air first hits the entrance end face 31, the shutter plate 41, and the shutter drive mechanism. 40 etc., so the cooling effect is high. Therefore, optical fibers with relatively low heat resistance It is possible to perform efficient heat treatment using light source 3 or high output light source 1. Become.

[0031] In addition, as a cooling means for the entrance end surface 31, etc., a water cooling pipe is installed in the entrance section holder 5, etc. A configuration such as attaching it is possible, but it would require mechanisms such as piping and the device would be large. Furthermore, it is not suitable for cooling the shutter plate 41, etc. to this On the other hand, as in this embodiment, a cooling device provided at a position facing the entrance end face 31 and the shutter plate 41 According to the fan 7, there is no above-mentioned drawback.

[0032]

[Effect of the idea]

As explained above, according to the configuration of the present invention, an optical heating device using an optical fiber can be used. It can prevent optical fibers and shutter plates from rising above their heat-resistant temperature during installation. Moreover, it is possible to prevent the device from increasing in size.

[Brief explanation of drawings]

FIG. 1 is a plan view for explaining the outline of an optical heating device according to an embodiment of the present invention.

FIG. 2 is a side view of the optical heating device of FIG. 1;

FIG. 3 is a schematic explanatory diagram of a conventional optical heating device using an optical fiber.

[Explanation of symbols]

1 Elliptical condenser mirror 10 First focus 15 Second focus 2 Light source 3 Optical fiber 31 Incidence end face 40 Shutter drive mechanism 41 Shutter board 44 Light reduction plate 5 Input part holder 521 Ventilation opening 522 Ventilation opening 7 Cooling fan 8 Object to be heated

──────────────────────────────────────────────── ──── Continued from the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location H01J 61/84 8019-5E H05B 3/00 345 8918-3K H05K 3/34 T 9154-4E // B29C 65/14 6122-4F B23K 101:42

Claims (2)

[Scope of utility model registration request] Claim 1: An elliptical condensing mirror, a light source having a light emitting part disposed at a first focal point of the elliptical condensing mirror, and an entrance end face disposed at a second focal point of the elliptical condensing mirror. an optical fiber having an optical fiber, a shutter plate for blocking light on the optical path before entering the input end face, a shutter drive mechanism for arranging the shutter plate on the optical path and retracting the shutter plate from the optical path, an input end face and the shutter. A light heating device characterized by comprising a cooling fan that sends cooling air to a plate and a shutter drive mechanism to cool the plate and the shutter drive mechanism. 2. The optical heating device according to claim 1, further comprising an entrance part holder for holding an entrance part of an optical fiber having the entrance end surface, and the entrance part holder holds the entrance part of the optical fiber with a gap therebetween. The light heating device is further characterized in that the incident part holder is provided with a ventilation hole through which cooling air from the cooling fan passes.