JPH04210867A - Light beam soldering device - Google Patents

Abstract

PURPOSE:To efficiently carry out beam condensing without out of focus by condensing a beam emitted from a light source lamp on a conical deflection mirror by an elliptic reflection mirror, reflecting and deflecting the beam on the surface of a conical polarizing mirror and condensing it on a specified point. CONSTITUTION:The beam emitted in the orthogonal direction to a lamp axis O1 from the light source lamp 3 is reflected on the peripheral. mirror surface of the conical polarizing mirror 7 on the way of an optical path and condensed on a condensing point P1. In addition, when a plane reflection mirror 8 is set up in front of the mirror 7, the beam is reflected on the mirror 8 and condensed on a condensing point P2. Consequently, a spot of the beam emitted from the light source lamp 3 is concentrated on a point without out of focus and a soldering part 5 is irradiated with the beam by positioning the soldering part 5 on the position of the condensing point position P1 or P2.

Description

[Detailed description of the invention]

[0001]

[Field of Industrial Application] The present invention relates to a light beam soldering device that condenses a light beam emitted from a light source lamp to a single point and irradiates the light spot onto a solder joint of an electronic component to perform soldering. . [0002]

2. Description of the Related Art First, FIG. 3 shows the conventional configuration of the above-mentioned light beam type soldering apparatus. In the figure, 1 is a lamp house, 2 is an elliptical concave reflection mirror formed on the inner periphery of the lamp house 1, and 3 is a tubular tube installed in the lamp house 1 aligned with the center extension and axis of the concave reflection mirror 2. A light source lamp (halogen lamp), 4 is a linear filament of the light source lamp 3, and 5 is a solder joint of an electronic component located in front of the lamp house 1. Note that the primary focus of the elliptical concave reflecting mirror 2 described above is represented by F+, and the secondary focus is represented by F2. [0003] With this configuration, the solder joint 5 is positioned to match the secondary focus F2 of the concave reflective mirror 2,
When the light source lamp 3 is turned on here, the light beam emitted from the light source lamp 3 is focused on a position corresponding to the secondary focus F2 of the concave reflective mirror, and the light spot illuminates the soldering part 5, heating the core part. and soldering. [0004]

However, the conventional light beam soldering apparatus described above has the following disadvantages in terms of use. That is, the filament 4 of the light source lamp 3 such as a halogen lamp is a linear filament having a predetermined length, and the lamp itself becomes a linear light source. on the other hand,
As can be seen from the trajectory of the light rays (dotted lines) shown in FIG. 3, the light rays emitted from the primary focus F1 of the concave reflective mirror 2 are condensed at the secondary focus F2, but at a position away from the primary focus F+,
That is, the light rays emitted from the lamp 3 corresponding to the upper end or the lower end of the filament 4 are reflected by the concave reflecting mirror 2 and then focused at a position away from the secondary focus F2. As a result, the secondary focus F2 of the concave reflecting mirror 2
The light spot irradiated onto the soldering part 5 placed on the soldering part 5 becomes out of focus and the spot diameter becomes large, and the energy density of the light spot also becomes low, resulting in poor solderability. [0005] As a measure to prevent the above-mentioned light spot from being out of focus, the light emitting range of the light source lamp 3 is limited to the central part of the filament 4 (located at the primary focus of the concave reflecting mirror), and the other circumferences are limited. We also tried covering the surface with a cover, but this method does not make full use of the output of the light source lamp and reduces the energy density of the light spot that illuminates the soldering area. It is also possible to use a light source lamp in which the filament 4 is not linear but dotted, but a lamp with such a filament structure cannot withstand high output for a long time. [0006] The present invention was conceived in view of the above points, and provides a light beam that efficiently condenses the light beam emitted from the linear filament of the light source lamp to one point without defocusing, thereby enabling spot soldering. The purpose of the present invention is to provide a type soldering device. [0007]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the light beam type soldering device of the present invention has a light beam type soldering device in which the inner peripheral mirror surface surrounding the periphery of the tubular light source lamp placed at the primary focus is aligned with the light source lamp axis. an elliptical reflecting mirror parallel to the lamp and having a width equivalent to the effective length of the lamp filament, and an outer circumferential surface disposed inside the elliptical reflecting mirror with the central axis aligned with the secondary focus of the elliptical reflecting mirror. and a conical deflection mirror, the light beam emitted from the light source lamp is focused on the conical deflection mirror by an elliptical reflecting mirror, and is reflected and deflected by the surface of the conical deflection mirror to condense it to one point. It shall be. [0008] Here, the conical deflection mirror in the above configuration has a shape such that all the light rays incident from a direction perpendicular to its central axis are converged on one point on the extension of the central axis. [0009] Furthermore, in order to irradiate the light beam emitted from the light source lamp installed in a horizontal position with respect to the lamp house from above toward the soldering part located below the lamp house, the conical deflection mirror in the above structure is used. It can be implemented with a plane reflection mirror in the front position which deflects the light beam reflected by the conical deflection mirror orthogonally towards the solder joint. [0010F

[Operation] According to the above configuration, all light rays emitted from the light source lamp in the direction perpendicular to the lamp axis within the filament effective length range will be emitted from the primary focus of the elliptical reflection mirror, so they will be reflected by the ellipse reflection mirror. All of the rays remain as parallel rays and head toward the circumferential surface of a conical deflection mirror, which is set up with its center axis aligned with the secondary focus of the elliptical reflecting mirror, and then are reflected and deflected by the outer mirror surface of the conical deflection mirror, converging on a single point. The light is focused. Therefore, by positioning the soldering part at the light condensing position and performing soldering, the light spot irradiated to the solder joint part is no longer out of focus, and soldering can be performed while ensuring a high energy density. [00111

[Embodiments] Examples of the present invention will be described below based on the drawings. In the figure, the same parts corresponding to FIG. 3 are given the same reference numerals. That is, instead of the elliptical concave reflection mirror 2 in FIG. 3, in the configuration of FIG.
Furthermore, it is provided with a plane reflection mirror 8 which is additionally provided as necessary. In addition, 9 is a side plate arranged on both sides of the elliptical reflection mirror,
Reference numeral 9a is a light extraction window opened on one side plate 9 (right side), 10 is a holder for the light source lamp 3, and 11 is a power connection lead for the lamp 3. [0012] Here, the elliptical reflecting mirror 6 has an inner peripheral mirror surface surrounding the tubular light source lamp 3 placed horizontally at the position of its primary focus F1, and is parallel to the lamp axis 01, and the light source lamp It is an annular mirror having a width equivalent to the effective length of the linear filament 4 of No. 3. On the other hand, the conical deflection mirror 7 has a mirror surface on its outer peripheral surface, and is arranged parallel to the lamp axis OI with its center axis 02 aligned with the secondary focus F2 of the elliptical reflecting mirror 6. Then, a mirror surface relative to the central axis 02 is formed so that all the light rays incident on the conical deflection mirror 7 from a direction perpendicular to the central axis 02 toward the circumferential surface thereof are focused on one point on the extension of the central axis 02. It is formed of a curved surface such that the inclination angle θ gradually increases from the apex (right end) to the bottom (left end) of the cone. [0013] When the light source lamp 3 is turned on with the above configuration,
All light rays emitted from the lamp in a direction perpendicular to the lamp axis O1 corresponding to the effective length of the linear filament 4 are emitted from the primary focus F+ of the elliptical reflecting mirror 6. Therefore, all of the light rays reflected by the mirror surface of the elliptical reflection mirror 6 head toward the secondary focus F2 as parallel rays, and are reflected by the outer peripheral mirror surface of the conical deflection mirror 7 midway along the optical path and are deflected laterally. In this case, since the conical deflection mirror 7 is formed into a mirror surface as described above, all reflected and deflected light rays are focused on one point represented by the convergence point P1 (however, in this case, the plane (Assume that the reflective mirror 8 does not exist). In addition, if a plane reflection mirror 8 is installed in front of the conical deflection mirror 7 as shown in the figure, the light beam is reflected by the plane reflection mirror 8, deflected downward, and condensed at a single point represented by a condensing point P2. It becomes like this. Therefore, the above-mentioned focal point position PI,
By positioning the soldering part 5 at the position F2, the spot of the light beam emitted from the light source lamp 3 is concentrated on one point and irradiated onto the soldering part 5 without defocusing. [0014] When soldering electronic components or the like using a light beam soldering device, the lamp house 1 is handled and positioned by a robot or the like, and a light spot is irradiated onto the soldering part from above. In this case, by combining the above-mentioned plane reflection mirror 8, a light spot can be irradiated onto the solder joint from above. In addition, this plane reflection mirror 8
In addition to adopting a half mirror, the above-mentioned focal point P+
By arranging an energy density detector at the position and variably controlling the amount of light emitted from the light source lamp 3 based on the detected value,
It is possible to always perform soldering under optimal conditions. [00,15] [Effects of the Invention] The light beam soldering device of the present invention has the following effects:
The configuration described above eliminates the problem of conventional devices where the irradiation spot is out of focus due to the length of the linear filament of the light source lamp, and efficiently uses the light rays emitted from the light source lamp. It is possible to focus all of the light onto one point, and as a result, it is possible to irradiate a light spot with high energy density to the solder joints and perform the soldering work effectively.

[Brief explanation of the drawing]

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

[Figure 2] Side view of main parts in Figure 1

[Figure 3] Configuration diagram of a conventional light beam soldering device

[Explanation of symbols]

1 Lamp house 3 Light source lamp 4 Linear filament 5 Solder joints 6　Elliptical reflective mirror 7 Conical deflection mirror 8　Plane reflection mirror L Effective length of filament D　Specular surface width of elliptical reflecting mirror F+ Primary focus F2 Secondary focus OL lamp shaft 02 Central axis of conical deflection mirror P+ Focus point of light beam F2 Focus point of light beam

Claims (3)

[Claims] 1. A light beam soldering device that focuses a light beam emitted from a light source lamp to a single point and irradiates the light spot onto a solder joint, the device comprising: a tubular light source lamp placed at a primary focus; An elliptical reflecting mirror whose inner circumferential mirror surface surrounding the periphery is parallel to the light source lamp axis and has a width equivalent to the effective length of the lamp filament, and an elliptical reflecting mirror whose central axis is aligned with the secondary focus of the elliptical reflecting mirror. A conical deflection mirror whose outer peripheral surface is a mirror surface is arranged inside the light source lamp, and the light beam emitted from the light source lamp is focused on the conical deflection mirror by an elliptical reflection mirror, and is reflected and deflected by the surface of the conical deflection mirror. A light beam type soldering device characterized in that the light beam is focused on a single point. 2. The soldering apparatus according to claim 1, wherein the conical deflection mirror has a shape that focuses all the light rays incident from a direction perpendicular to the central axis onto one point on an extension of the central axis. A light beam soldering device featuring: 3. The soldering apparatus according to claim 1, further comprising a plane reflection mirror positioned in front of the conical deflection mirror for deflecting the light beam reflected by the conical deflection mirror in a direction perpendicular to the solder joint. A light beam soldering device characterized by: