JPH0596366A - Soldering apparatus - Google Patents

Abstract

PURPOSE:To condense a luminous flux from a light source at high efficiency and to generate the luminous flux for soldering having high light energy density. CONSTITUTION:The luminous flux emitted from the light source 1 near a first focus is condensed to a second focus with an elliptic mirror 2 and reflected with a hemispherical auxiliary spherical surface mirror 3 covering the emitting side of the elliptic mirror 1 by using the first focus as the spherical center and introduced to the reflecting mirror 2 and the whole luminous flux from the light source 1 is condensed to the second focus from an opening part 3A of the spherical surface mirror 3. This luminous flux is deviated from the light axis A with a first flat surface mirror 4 and a second flat surface mirror 6 and introduced to a soldering position 8 while confirming by an observing system and image to the soldering position 8 with an imaging lens 7 to give the high density light energy to the soldering position 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soldering apparatus utilizing light energy, and more particularly to improvement of a portion for guiding a light beam from a light source to a soldering point.

[0002]

2. Description of the Related Art As a conventional soldering device utilizing light, a structure shown in FIG. 2 is known.

In the figure, 31 is a xenon light source, and an elliptical mirror 32.
Is disposed near the first focal point. Reference numeral 34 is an optical fiber for guiding the light from the xenon light source 31 to the soldering portion 37, and its incident end face 33 is arranged at the image forming position of the xenon light source 31 by the elliptical mirror 32. Optical fiber 3
An image forming lens 36 for condensing light at a soldering portion 37 is arranged on the side of the emission end face 35 of 4.

Then, the xenon light source 31 is imaged on the incident end face 33 of the optical fiber 34 by the elliptic mirror 32, and is further imaged on the soldering spot 37 by the imaging lens 36.

[0005]

However, since the above-mentioned conventional light source device uses the optical fiber 34,
There are the following problems.

(1) The light reflected by the peripheral portion of the elliptic mirror 32 has a large incident angle with respect to the incident end face 33 of the optical fiber 34, and a light ray exceeding the allowable incident angle of the optical fiber 34 has effective light energy. Cannot be communicated to.

(2) Since the optical fiber 34 has a structure in which many thin glass fibers are bundled, the incident end face 3
3 has a gap between the bundled glass fibers,
The light rays incident on it are not used effectively, resulting in a loss of light energy.

(3) When a light beam passes through an optical fiber, attenuation occurs due to the transmittance of glass, resulting in a loss of light energy.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a soldering device capable of efficiently focusing a light flux from a light source on a soldering portion while suppressing loss of light energy. ..

[0010]

In order to solve the above-mentioned problems, the present invention provides an elliptical mirror for converging a light beam emitted from a light source near the first focal point on the optical axis to a second focal point, and the first focal point. And a hemispherical auxiliary spherical mirror having an opening for guiding the convergent light to the second focus, and the second focus is imaged. It is characterized in that the lens and the two plane mirrors are conjugated with the soldering point, and the imaging lens and the two plane mirrors are rotatable with respect to the optical axis.

[0011]

According to the above-mentioned structure, the light beam from the light source is reflected by the elliptical mirror and focused on the second focal point, and the light beam reflected by the hemispherical auxiliary spherical mirror advances to the elliptic mirror and is reflected by this elliptic mirror. To focus on the second focal point. The light flux from this light source is directed to the soldering spot by the reflecting mirror and is condensed by the imaging lens to give high density light energy to the soldering spot.

[0012]

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

FIG. 1 is a schematic configuration diagram showing a light source device which is a main part of the soldering device of this embodiment, and FIG. 3 is an overall configuration diagram of the soldering device.

In FIG. 1, reference numeral 1 is a light source composed of a xenon lamp. This light source 1 is a discharge lamp, and both electrodes have an optical axis A.
It has an annular light distribution characteristic at an angle of about 30 ° to 150 ° with respect to the optical axis A. That is, the optical axis A from the light source 1
Since no light beam is emitted at a solid angle of ± 30 ° behind and ± 30 ° forward, an opening is provided in the central portion (intersection with the optical axis A) of the elliptic mirror 2 described later, and is supported through this opening. A light source 1 is supported by inserting a member (not shown).

Reference numeral 2 denotes the light source 1 arranged near the first focal point.
An elliptic mirror that reflects the light beam from the light source 1 reflects the light beam toward the rear side (the upper side in the drawing) of the light source 1 and focuses it on the second focal point.

Reference numeral 3 denotes a hemispherical auxiliary spherical mirror, in which a part of the spherical surface is used and the inner surface thereof is a mirror surface. The hemispherical auxiliary spherical mirror 3 is arranged so as to cover the exit side opening (front side of the ellipsoidal mirror 2) with the first focus of the ellipsoidal mirror 2 as a spherical core, and reflects the entire light flux directed from the first focal point to the front side. Then, the light is returned to the light source 1 side, reflected by the elliptical mirror 2 as a light flux directed to the rear side, and condensed at the second focus. Further, the optical axis A of the hemispherical auxiliary spherical mirror 3
An opening 3A is formed at the intersection of and. The opening 3A is within the solid angle of ± 30 ° and the light flux from the light source 1 does not propagate directly, but the light flux reflected by the elliptical mirror 2 is guided and focused at the second focal point.

The elliptical mirror 2 and the hemispherical auxiliary spherical mirror 3 are
It is preferable that the ellipsoidal mirror 2 receives and reflects the light flux emitted to the rear side of the light source 1 and the semi-spherical auxiliary spherical mirror 3 reflects the light flux emitted to the front side. Since the hemispherical auxiliary spherical mirror 3 has a larger radius of curvature than the elliptic mirror 2, it has an annular gap (annular opening) 3B between them and the opening 3A and the annular opening 3B.
The light source 1 is cooled by using one of them as an inlet for cooling air and the other as an outlet for cooling air.

Reference numeral 4 denotes a first plane mirror, which is located near the second focal point of the elliptic mirror 2 and is provided on the optical axis A. The light flux from the elliptic mirror 2 is reflected laterally from the optical axis A and is extracted. 5 is the first plane mirror 4
The aperture provided at the position (substantially the second focal point position) where the light flux reflected by is condensed and formed an image, of the light flux condensed to the minimum diameter, is eliminated. Reference numeral 6 denotes a second plane mirror, which further reflects the light beam extracted by the first plane mirror 4 to form a light beam toward the soldering point 8. 7
Is an image forming lens, which focuses the light flux reflected by the second plane mirror 6 on the soldering point 8. In this imaging lens 7, the second focus and the soldering point 8 are conjugated.

The first plane mirror 4, the second plane mirror 6 and the imaging lens 7 have an integral structure in which their positional relationship is fixed, and are further mounted so as to be rotatable with respect to the optical axis A. Further, the soldering point 8 where the light flux reflected by the second plane mirror 6 forms an image is set on the optical axis A, and its position is not displaced by the rotation of the first and second plane mirrors 4, 6 and the image forming lens 7. It is like this. Further, the first and second plane mirrors 4 and 6 are tilted so that the light flux does not overlap the optical axis A, thereby preventing the light flux from directly impinging on the element to be soldered.

An observation system (not shown) for observing the soldering points 8 can be provided below the first plane mirror 4 on the optical axis A (on the side of the soldering points 8). ..

Next, a soldering device equipped with the light source portion having the above structure will be described with reference to FIG.

Reference numeral 11 in the drawing denotes a base plate, which is the base plate 1.
Each device described below is mounted on the upper surface of 1. Reference numeral 12 denotes a movable table on which the printed circuit board 13 and the like is placed and which is used for soldering work, and is attached to the first guide device 14. The first guide device 14 has a pair of support plates 15 fixed to the base plate 11 and both sides supported by the support plates 15.
A pair of guide rods 16 that slidably support 2, a drive rod 17 that is rotatably attached to the support plate 15 and is parallel to the guide rod 16, and the drive rod 17
And a drive motor 18 for rotating the motor.
The drive rod 17 is provided with threads, which are engaged with the carriage 12. Then, by rotating the drive rod 17 by driving the drive motor 18, the moving base 12 is moved by being guided by the guide rod 16 by the thread thereof.

Reference numeral 20 denotes a light source device, the inside of which is constructed as shown in FIG. Furthermore, this light source device 20
Is attached to the second guide device 21. This second
The guide device 21 is arranged in a direction orthogonal to the first guide device 14, and like the first guide device 14,
The drive motor 2 includes a pair of support plates 22, a pair of guide rods 23, a drive rod 24, and a drive motor 25.
The light source device 20 is driven by driving the drive rod 24 by
Moves in a direction orthogonal to the moving direction of the moving table 12 to perform soldering at an appropriate position. The drive motors 18 and 25 are connected to a control device (not shown), and the light source device 20 is also connected to automatically move the soldering location 8 onto the optical axis A for soldering work. ..

The soldering device configured as described above operates as follows.

The luminous flux emitted from the light source 1 advances to the front side and the rear side. The light flux traveling to the rear side is reflected by the elliptic mirror 2 and enters the first plane mirror 4 (condenses at the second focus). The light flux traveling to the front side is reflected by the hemispherical auxiliary spherical mirror 3 and travels backward in the same optical path,
After passing through the light source 1 again, the light enters the elliptic mirror 2, and the elliptic mirror 2
It is reflected by and is focused on the second focal point. Thereby, the light source 1
All the light fluxes emitted from the first plane mirror 4 enter.

This light flux is reflected by the first plane mirror 4 and then forms an image at the second focal point. Since the xenon lamp, which is the light source 1, has a short arc length, it is condensed in an extremely small area near the second focal point. Further, the luminous flux bleeding around is removed by the opening 5 provided at the second focal point to become a luminous flux having a high optical energy density. Then, this light flux is reflected by the second plane mirror 6 to become a light flux heading for the soldering point 8, and is condensed by the imaging lens 7 to the soldering point 8 and the second high energy density second flux.
A focus image is formed.

On the other hand, in the entire soldering apparatus, the printed board 13 is placed on the moving table 12. While observing the soldering points 8 in the observation system, the drive motor 18 is controlled to move the moving table 12, and the drive motor 25 is further controlled to move the light source device 20 in a direction orthogonal to the moving direction of the moving table 12. It As a result, the soldering point 8 on the printed circuit board 13 is moved to the intersection with the optical axis A, and the soldering point 8
The light flux is condensed in a small area of the area, and the soldering is efficiently performed without directly contacting the soldering location 8.

As a result, the light flux from the light source 1 can be accurately and efficiently focused on the soldering point 8 to obtain a soldering light flux having a high light energy density.

In the above embodiment, only one set of the first plane mirror 4, the second plane mirror 6 and the image forming lens 7 for guiding the light beam from the light source 1 to the soldering point 8 is provided, and with respect to the optical axis A. Although it is rotatably disposed, a plurality of sets of the second plane mirror 6 and the imaging lens 7 are fixedly provided around the optical axis A, and only the first plane mirror 4 is rotatably provided with respect to the optical axis A. This first
By rotating the plane mirror 4, it may be appropriately selected from a set of the plurality of second plane mirrors 6 and the imaging lens 7 in accordance with the irradiation direction of the light flux to the soldering portion 8. Furthermore, the plurality of second plane mirrors 6 and the imaging lenses 7 may be appropriately set in their light guide direction and focal length in accordance with the position of the soldering location and the like.

[0030]

As described above in detail, the present invention has the following effects.

Since all the light fluxes from the light source are condensed by the elliptic mirror and the hemispherical auxiliary spherical mirror, and the image is formed on the soldering portion by the plane mirror without using the optical fiber which causes a loss during the propagation, it is high. The light can be condensed with high efficiency, and a light flux with a high light energy density can be obtained.

This makes it possible to obtain a soldering light flux that is extremely effective for heating a very small area.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing a light source device portion of a soldering device of the present invention.

FIG. 2 is a schematic configuration diagram showing a conventional soldering device.

FIG. 3 is a perspective view showing an overall configuration of a soldering device of the present invention.

[Explanation of symbols]

 1 Light Source 2 Elliptical Mirror 3 Hemispherical Auxiliary Spherical Mirror 4 First Plane Mirror 6 Second Plane Mirror 7 Imaging Lens 8 Soldering Point A Optical Axis

Claims (1)

[Claims] 1. An elliptical mirror for converging a light beam emitted from a light source near the first focus on a second focal point on an optical axis, and a first core having a spherical core to cover an emission side of the elliptic mirror. And a semi-spherical auxiliary spherical mirror having an opening for guiding converged light to the second focus, and the second focus is conjugated with a soldering point by an imaging lens and two plane mirrors. A soldering device characterized in that an image lens and two plane mirrors are rotatable about an optical axis.