JPH0481263A - Light beam soldering device - Google Patents

Abstract

PURPOSE:To allow adequate preheating with one light source by providing a lamp house freely changeably to a focusing state and a defocusing state in the device consisting of the light source, the lamp house and an optical system. CONSTITUTION:The lamp house 22 is adjusted to the defocusing state and a work 29 to be soldered is irradiated with a light beam 31, by which the work 29 is preheated to a relatively low temp. The lamp house 22 is then adjusted to the focusing state to irradiate the work 29 with the light beam 31, by which the work 29 is subjected to normal heating to a high temp. The work 29 is preheated at the relatively low temp. in this way and the solderability is improved. The adequate preheating is executed with the one light source and the need for special equipment for preheating is eliminated. The increase in the cost of the device is thus prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a light beam soldering device that performs soldering using the heat of a light beam.

(Prior Art) Generally, as shown in FIG. 3, a light beam soldering apparatus includes a light source (halogen lamp or xenon lamp) 11 and a lamp house (elliptical reflection lamp) disposed around the light source 11. mirror) 12, a first plane mirror 13 and a second plane mirror 1 arranged on the opening side of the lamp house 12.
4 and a condenser lens (cylindrical lens) 15, and a mask (automatic mask) 18 disposed between the optical system 16 and a substrate 17.

An electronic component 19 as a workpiece to be soldered is mounted on the substrate 17.

In such a light beam soldering device, conventionally, a light source 11, a lamp house 12, a first plane mirror 13, a second plane mirror 14, a condensing lens 15, a mask 18, and an electronic The positional relationship with component 19 is electronic component 1
It is fixed in a focused state such that the light beam is focused on the solder opening part (lead etc.) 9.

Then, the light beam emitted from the light source 11 to the surroundings is
Directed downward by reflection on the inner surface of the lamp house 12, split into a plurality of light beams by a plurality of optical systems 16,
The light beam is condensed, the irradiation range is limited by the mask 18, and is irradiated onto a plurality of parts to be soldered on the electronic component 19, and the heat of the light beam performs local soldering at a plurality of locations on a single component at once.

(Problem to be Solved by the Invention) Conventionally, such soldering using a light beam was performed directly on a workpiece to be soldered that had not been preheated, so there were cases where sufficient solderability could not be obtained. be.

On the other hand, when preheating the workpiece to be soldered, usually
Although equipment such as a heating furnace is provided separately, there is a problem in that the cost of the equipment increases significantly.

The present invention has been made in view of these points, and an object of the present invention is to improve solderability without increasing the cost of the device.

[Structure of the invention]

(Means for Solving the Problems) The invention of claim 1 includes a light source 21, a lamp house 22 disposed around the light source 21, and a lamp house 22 disposed around the light source 21.
an optical system 23 disposed on the opening side, and a mask 27 disposed between the optical system 23 and the workpiece 29 to be soldered.
In the light beam soldering apparatus, the lamp house 22 is provided so as to be freely changeable between a focused state and a defocused state.

The invention of claim 2 provides a light source 21, a lamp house 22 disposed around this light source 21, and this lamp house 22.
an optical system 23 disposed on the opening side, and a mask 27 disposed between the optical system 23 and the workpiece 29 to be soldered.
In the light beam soldering apparatus, the optical system 23 is provided to be freely changeable between a focused state and a defocused state.

(Function) The invention of claim 1 adjusts the lamp house 22 to a defocused state and directs the light beam 31a to the workpiece 2 to be soldered.
9 to preheat the workpiece 29 to be soldered at a relatively low temperature, and then adjust the lamp house 22 to a focused state and irradiate the workpiece 29 to be soldered with the light beam 31b. Work to be soldered 2
9 is heated at a high temperature.

In the invention of claim 2, the workpiece to be soldered 29 is preheated at a relatively low temperature by adjusting the optical system 23 to a defocused state and irradiating the workpiece to be soldered 29 with the light beam 31g, and then By adjusting the optical system 23 to a focused state and irradiating the workpiece 29 to be soldered with the light beam 31b, the workpiece 29 to be soldered is actually heated at a high temperature.

(Example) Hereinafter, the present invention will be described in detail with reference to an example shown in FIG. 1 and an explanatory diagram shown in FIG.

As shown in FIG. 1, a light source unit is composed of a light source 21, a lamp house 22 arranged around the light source 21, and a plurality of optical systems 23 arranged on the opening side of the lamp house 22. has been done.

As the light source 21, a halogen lamp, a xenon lamp, or a metal halide lamp is used.

As the lamp house 22, an elliptical reflecting mirror is used.

The optical system 23 includes a first plane mirror 24, a second plane mirror 25, and a condensing lens (cylindrical lens) 26.
It is made up of.

Further, the irradiation range of the light beam branched and focused by this optical system 23 is limited by a mask (automatic mask) 27 placed below the optical system 23. A shutter is provided in the through hole of this mask 27, and the opening is controlled at a necessary time and for a necessary time, and the light beam is transmitted through the hole.

A substrate 28 and an electronic component 29 as a workpiece to be soldered are carried under the mask 27 by a net conveyor, a chain conveyor, or the like (not shown).

In such a light beam soldering apparatus, the lamp house 22 is provided so as to be freely changeable between a focused state and a defocused state. That is, the lamp house 22 is provided so as to be vertically movable.

Further, the optical system 23 is provided so as to be freely changeable between a focused state and a defocused state.

That is, the mirrors 24 and 25 of the optical system 23 are provided so as to be freely changeable in angle, and the condenser lens 26 is provided so as to be freely movable in the optical axis direction.

Then, the light beam emitted from the light source 21 to the surroundings is
The light is directed toward the lower blade by reflection on the inner surface of the lamp house 22, and is converted into a plurality of light beams by the plurality of optical systems 23 and irradiated onto the shutter of the mask 27.

When the board 28 and the electronic component 29 are carried into the position shown in FIG. The attachment part (lead) is irradiated.

In the irradiation of this light beam 31, first, the lamp house 22. By adjusting at least one of the mirrors 2L and 25 or the condensing lens 2G to a defocused state, the out-of-focus light beam aha is directed to the electronic component 29, as shown by the solid line in the explanatory diagram of FIG. By irradiating, the soldering target part 29a is heated to a relatively low temperature (80~
Preheat to about 150°C.

Then, the lamp house 22 which was in the defocused state. The mirrors 24, 25 or the condensing lens 26 are returned to the focused state, and the focused light beam 31b is directed to the part to be soldered 2, as shown by the dotted line in the explanatory view of FIG.
By irradiating 9a, this soldering target part 29a
Heat it at a high temperature.

In this way, the light beam 3 is simultaneously applied to multiple locations.
By the main heating in step 1, local reflow soldering (=J) is performed at multiple locations on the W component at once.

〔Effect of the invention〕

According to the invention of claim 1, since the lamp house of the light beam soldering apparatus is provided so as to be changeable between the focused state and the defocused state, the lamp house is deactivated prior to main heating in the focused state. The workpiece to be soldered can be preheated at a relatively low temperature in the focused state, and soldering performance can be improved. Further, since appropriate preheating can be performed with one light source and no special equipment for preheating is required, an increase in the cost of the apparatus can be prevented.

According to the second aspect of the invention, the same effect as in the first aspect can be obtained by providing the optical system of the light beam soldering apparatus so as to be changeable between a focused state and a defocused state.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing an embodiment of the light beam soldering device of the present invention, FIG. 2 is an explanatory diagram showing its operation, and FIG. 3 is a schematic diagram showing a conventional light beam soldering device. 21...Light source, 22...Lamp house, 23...Optical system, 27...Mask, 29...Work to be soldered.

Claims (2)

[Claims] (1) A light source, a lamp house placed around this light source, an optical system placed on the opening side of this lamp house, and a mask placed between this optical system and the workpiece to be soldered. What is claimed is: 1. A light beam soldering device comprising: a light beam soldering device characterized in that the lamp house is provided so as to be freely changeable between a focused state and a defocused state. (2) A light source, a lamp house placed around this light source, an optical system placed on the opening side of this lamp house, and a mask placed between this optical system and the workpiece to be soldered. What is claimed is: 1. A light beam soldering apparatus comprising: the optical system being provided so as to be freely changeable between a focused state and a defocused state.