JP3287143B2 - Light beam heating device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light beam heating apparatus that uses a heat light source such as a xenon lamp, condenses the light, solders electronic parts and connectors, and heat-processes resin and the like.

[0002]

2. Description of the Related Art A conventional light beam heating apparatus has a configuration shown in FIG. 3, which will be described below.

[0003] 1 is an ellipsoidal reflecting mirror and 2 is its first focal point F1.
Alternatively, a heat source (for example, a xenon lamp) disposed near the first focal point F1 is a second focal point F of the elliptical reflecting mirror 1.
The optical fiber 4 disposed at 2 is a mirror housing for fixing the optical fiber 3 at the position of the elliptical reflecting mirror 1 and the second focal point F2 of the elliptical reflecting mirror 1.

Light rays radially generated from the heat light source 2 disposed at the first focal point F1 of the elliptical reflecting mirror 1 are reflected by the elliptical reflecting mirror 1 and condensed at the second focal point F2. F
It enters the optical fiber 3 placed in 2. Optical fiber 3
The other end is disposed on a soldered portion such as an electronic component, and a heating process such as soldering is performed by irradiating a light beam guided through the optical fiber 3.

[0005]

However, in the above-mentioned conventional configuration, all the light beams emitted from the heat light source 2 do not enter the elliptical reflecting mirror 1, and some light beams irradiate the side surface of the mirror housing 4. . Further, the heat light source 2 is not a perfect point light source. For example, in the case of a xenon lamp, the light source is a columnar light source. Light rays that have not entered the optical fiber 3 illuminate the bottom surface of the mirror housing 4. Then, the mirror housing 4 generates heat and the temperature rises. The mirror housing 4 expands according to the temperature rise,
There is a problem that the second focal point F2 of the ellipsoidal reflecting mirror 1 and the incident end 3a of the optical fiber 3 do not coincide with each other, and the amount of light entering the optical fiber 3 gradually decreases.

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems. A light beam heating apparatus for outputting stable light energy from an optical fiber by reducing thermal expansion due to a rise in temperature of a mirror housing constituting an optical axis. The purpose is to provide.

[0007]

To achieve this object, a light beam heating apparatus according to the present invention comprises a light irradiating means for irradiating light, and a condensing means for condensing the light irradiated by the light irradiating means. Light transmitting means for transmitting the light collected by the light collecting means to an arbitrary portion; holding means for holding the light collecting means and the light transmitting means; and the light irradiating the holding means. it is provided with a light shielding means for preventing that you heating and expansion of the holding means is.

Further, a cooling means for cooling the light shielding means is provided. In addition, at least the light-irradiated portion of the light- shielding means is provided with a color or three-dimensional means having good light absorption.
It is provided as absorbing means .

[0009]

According to this structure, the light irradiated from the light irradiating means and not incident on the light transmitting means is irradiated on the light shielding means, so that the thermal expansion of the holding means can be prevented, and the light condensing means and the light collecting means can be prevented. The positional relationship with the transmission means is maintained, and the light energy incident on the light transmission means can be stabilized.

Further, when the temperature rise of the light shielding means is transmitted to the holding means due to the radiant heat of the light shielding means, the positional relationship is deviated, so that the temperature rise of the light shielding means is prevented by the cooling means.

Further, at least light of the light shielding means is irradiated.
Color or three-dimensional means of absorbing light
Since it is provided as an absorbing means to improve light absorption, reflection of light from the light shielding means can be reduced.

[0012]

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

In FIG. 1, reference numeral 1 denotes an ellipsoidal reflecting mirror as a condensing means, 2 denotes a xenon lamp as a heat light source as a light irradiating means, and 3 denotes an optical fiber as a light transmitting means.
Is located at a position coinciding with the second focal point F2 of the elliptical reflecting mirror. Reference numeral 4 denotes a holding unit which is a mirror housing for fixing the optical fiber 3 at the position of the ellipsoidal reflecting mirror 1 and the second focal point F2 of the elliptical reflecting mirror 1, and 5 is a mirror housing 4 which receives the light emitted from the xenon lamp 2 Light-shielding plate to shield the light,
Reference numeral 6 denotes a light-shielding plate for shielding the bottom surface of the mirror housing 4, 7 and 8, cooling fans for cooling the light-shielding plates 5 and 6, 9
Numerals 10 and 10 denote light-shielding plates for shielding the cooling fans 7 and 8 from light emitted from the xenon lamp 2 and preventing deterioration of the material due to heat generation and ultraviolet rays. In addition, the light shielding plates 5, 6,
The surfaces 9 and 10 have a black surface to improve light absorption, and are used as light absorbing means.

The operation of the light beam heating apparatus configured as described above will be described with reference to FIG.

First, light rays 11 and 12 which are emitted from the xenon lamp 2 and do not enter the elliptical reflecting mirror 1 are shielded by the light shielding plates 5 and 10, so that the mirror housing 4
Do not irradiate. Therefore, the mirror housing 4 does not generate heat. In the case of an arc discharge lamp, such as a xenon lamp 2, it is not a perfect point light source.

The scattered light 13 is shielded by the light shielding plate 6 on the bottom surface of the mirror housing 4. The light-shielding plates 5, 6, 9 and 10 have a black surface to improve light absorption and reduce heat generation of the xenon lamp 2 due to light reflection. The light-shielding plates 5, 6, 9 and 10 that have absorbed the light rays generate heat, so that the cooling fan 7 draws in outside air and the cooling fan 8 exhausts the air to the outside of the apparatus. Then, by cooling the light shielding plates 5, 6, 9 and 10, the temperature rise of the mirror housing 4 due to the radiation heat of the light shielding plates 5, 6, 9 and 10 is reduced. Mirror housing 4
, The vertical thermal expansion of the mirror housing 4 is reduced, the positional relationship between the second focal point F2 and the incident end 3a of the optical fiber 4 is maintained, and the optical fiber 4
Can be minimized.

FIG. 2 shows a comparison between the output from the optical fiber 3 according to the present embodiment and the conventional example having no light shielding plate.

As is apparent from FIG. 2, the light beam heating apparatus according to the present embodiment has an excellent effect in that the change in the light energy emitted from the optical fiber 3 is small. In this embodiment, the light shielding plates 5, 6, 9,
Although the surface color of 10 was black, it is not particularly limited to black as long as it is a color that absorbs light, such as dark blue, and three-dimensional means such as providing a honeycomb-like structure may be used. Needless to say.

[0019]

As described above, according to the present invention, the provision of the light shielding means for blocking the light emitted to the holding means prevents the heat generation and expansion of the holding means and the position of the light collecting means and the light transmitting means. By maintaining the relationship accurately, the amount of light incident on the light transmitting means, that is, the change in light energy emitted from the light transmitting means is reduced, and an excellent light beam heating device capable of more stable soldering and thermal processing. It can be realized.

Further, by providing a cooling means for cooling the light shielding means or by providing a light absorbing means at least in a portion of the light shielding means to be irradiated with light, the positional relationship between the light condensing means and the light transmitting means can be further improved. It is possible to provide a light beam heating device which can be held accurately and is more excellent.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a light beam heating device according to an embodiment of the present invention.

FIG. 2 is a comparison diagram of the output from the end of an optical fiber in a conventional example and an embodiment of the present invention.

FIG. 3 is a configuration diagram of a conventional light beam heating device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Elliptical reflective mirror 2 Xenon lamp 3 Optical fiber 4 Mirror housing 5, 6, 9, 10 Shield plate 7, 8 Cooling fan

──────────────────────────────────────────────────続 き Continuation of the front page (72) Nobuyuki Hashi, Inventor 1006 Kazuma, Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References JP-A-3-226362 (JP, A) JP-A-3-3- 198989 (JP, A) JP-A 4-118286 (JP, U) JP-A 2-28364 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B23K 1/005 B23K 26 / 00 G02B 6/26 G02B 6/32 H01J 61/86

Claims (3)

(57) [Claims] 1. A light irradiating means for irradiating light, a condensing means for condensing the light irradiated by the light irradiating means, and transmitting the light condensed by the light condensing means to an arbitrary portion. an optical transmission means, and holding means for holding said light transmitting means and the focusing means, said light is irradiated to the holding means
The light beam heating apparatus provided with a light shielding means for preventing that you heating and expansion of the retaining means. 2. The light beam heating device according to claim 1, further comprising cooling means for cooling the light shielding means. 3. A light-absorbing color or three-dimensional means is provided on at least a part of the light- shielding means to which light is irradiated.
The light beam heating device according to claim 1 provided as a step .