JP3461375B2 - Spot type heater - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat source device for soldering, for example, a flat package IC or a semiconductor component to a printed circuit board used in various electric equipments. More specifically, the present invention relates to a spot heater that can focus a heat ray from a heat source lamp provided on a primary condenser mirror on a small focal hole and irradiate a workpiece to be soldered as high-energy spot light. [0002] For example, two-way or four-way flat packages I used in various electronic devices.
C. When soldering a small semiconductor component to a printed circuit board, heat rays from a lamp are used as a clean soldering means. For example, in the case of a long and thin straight part to be processed, as soldering devices for forming a straight high heat ray, Japanese Patent Application Laid-Open Nos. 61-140368, 61-152238, 61-185556
No., US Pat. No. 3,862,397, US Pat. No. 1802,
No. 167, U.S. Pat. No. 3,320,466.
In addition, when the part to be processed is in the form of a spot, a lamp is mounted in a condensing mirror having an opening on one side, and the part to be processed is irradiated with reflected heat rays and soldered. [0003] In the case of soldering a spot-shaped workpiece, a device for generating a linear heat ray causes large heat damage to parts by irradiating heat other than necessary. give. In the apparatus for generating the heat ray of the spot-shaped workpiece, the heat ray is diffused and radiated from the entire aperture surface of the collecting mirror where one surface opens, so that only a part of the heat ray can be focused on the workpiece,
It is difficult to obtain high-energy spot light, and the heat rays are diffused and irradiated from the entire aperture surface of the condensing mirror, so that a thermal adverse effect is exerted on portions other than the processed portion. According to the present invention, the heat rays from the lamp are condensed by the primary condenser mirror and condensed on the focal hole, and the heat rays condensed by the secondary condenser mirror are condensed on the focal hole. In addition, high-energy spot light that is extremely suitable for local heating can be obtained, and by making the primary and secondary condensing mirrors detachable, the secondary condensing can be performed according to the spot size of the workpiece. By appropriately replacing the optical mirror so that it can be applied to a wide range of workpieces, and further, the heel of the primary condenser mirror and the secondary condenser mirror is clamped with a tightening ring, so that the Preventing light leakage, and interposing a transparent plate on the joint surface of the primary and secondary collector mirrors to prevent impurities such as smoke generated during work from entering the secondary collector mirror, and also Forced in secondary collector mirror To be pressed into the air, to prevent fogging of the secondary focus plane and the transparent plate, there is provided a spot bract heater always be maintained in a clean state secondary condensing surface and the transparent plate. The present inventors have eagerly developed a spot-type heater capable of obtaining high-energy spot light while having a compact structure.
As a result of repeated research, the present invention was completed. The present invention includes a primary focusing mirror having a lamp with one side projecting into the opening to the inner surface is formed on the primary light-condensing surface and primary light-condensing surface, is formed on the inner surface is opened is one side secondary converging surface and A secondary condensing mirror having a focal hole in the center of the secondary condensing surface, a transparent plate interposed on a mating surface of the primary condensing mirror and the secondary condensing mirror, and the primary condensing mirror, In a heater equipped with a detachable means for detachably attaching the secondary condenser mirror,
An air hole opened in the secondary condensing surface of the secondary condensing mirror and the air
Forces air into the pores and ejects from a small diameter focal hole
The secondary condensing surface is focused on the outermost heat ray condensed on the primary condensing surface at the focal hole of the secondary condensing mirror. Formed so as not to disturb the light collection path
Heat collected and matched by the primary and secondary condensing surfaces
Spot type heater that directly irradiates the part to be processed from a small diameter focal hole . Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows the left half of a spot heater according to the invention in section. The spot heater 1
The primary condenser mirror 2 and the secondary condenser mirror 3 are detachably coupled. The primary condensing mirror 2 is formed on a primary condensing surface 4 whose inner surface is curved, and a lamp, for example, a halogen lamp mounting hole 5 is provided in the center of the primary condensing surface 4. The heat rays from the halogen lamp 6 that is a heat source condensed on the primary condensing surface 4 are condensed on the focal hole. [0007] A halogen lamp 6 as a heat source is inserted into the lamp mounting hole 5, and the halogen lamp 6 is formed with a lamp base 7 and a light emitting portion 8 of 14 V, 150 W, for example, in a unit structure. The light-emitting unit 8 is the primary condensing surface 4.
The heat rays from the light-emitting portion 8 are condensed on the primary condensing surface 4 to the small focal hole provided at the center of the secondary condensing mirror 3 and also to the secondary condensing mirror 3. The heat rays collected on the secondary condensing surface 22 are condensed on the focal hole, and the collected heat rays are irradiated to the workpiece as high-energy spot light. The base 7 of the halogen lamp 6 is placed horizontally on a mounting seat 9 provided on the primary condenser mirror 2, and the screw 1
When the lamp needs to be replaced, for example, by cutting the lamp filament, etc., the unit structure halogen lamp 6 can be removed from the lamp mounting hole 5 simply by removing the screw 10 screwed into the mounting seat 9.
Can be easily replaced with a new unit structure lamp. A cover cylinder 11 is detachably attached to the primary condensing mirror 2 with screws 12, and usually the lamp base 7 side is closed to protect the halogen lamp 6. The cover cylinder 11 is provided with a mounting arm 13 and is detachably attached to a fixed arm of a soldered automatic line (not shown) using the mounting hole 14 provided in the cover cylinder 11,
The spot heater is incorporated into an automatic line. The opening edge of the primary condenser mirror 2 has
6 is provided horizontally in the outward direction, and the flange 16 is formed horizontally on the opening edge 17 of the secondary condenser mirror 3 in the flange 16.
8 is matched. The inner end corner of the opening edge of the primary collector mirror is formed on the outermost collector surface 15 described later. The scissors 16 and 18 matched with each other as described above are detachably coupled by the fastening ring 19 which is a detachable means. The fastening ring 19 pivotally attaches one end of the half-ring pieces 20 and 21 with a pivot, and the half-ring pieces 20 and 21 are opened and closed around the pivot.
The primary condenser mirror 2 and the secondary condenser mirror 3 can be easily attached and detached. As shown in FIG. 2, half-ring pieces 20, 21
The other end is detachably fastened with a fastening screw 23, and the mating surfaces of the primary condenser mirror 2 and the secondary condenser mirror 3 are tightly joined. That is, notch step portions 24 and 25 are formed on the inner surface side of the half ring pieces 20 and 21, and the step portions 24 and 25 engage with the flanges 16 and 18, respectively.
By tightening 1, the joint surface 26 between the primary condenser mirror 2 and the secondary condenser mirror 3 is pressed and tightly tightened to prevent leakage of heat rays from the joint surface 26. An annular step portion 30 is formed on the inner edge of the opening surface of the secondary condenser mirror 3, and a peripheral edge of a transparent plate such as a heat-resistant transparent glass 31 is horizontally mounted on the annular step portion 30. And the peripheral edge of the primary collecting mirror 2 is 14
Are pressed against the surface of the annular step portion 30 of the secondary condenser mirror 3 and stably held. The transparent plate 31 completely partitions the primary condenser mirror 2 and the secondary condenser mirror 3 to prevent impurities such as smoke from entering the primary condenser mirror 2, and the primary condenser surface 4 and the light emitting unit. Always keep 8 clean. As shown in FIG. 3, the secondary condenser mirror 3
The secondary condensing surface 22 formed on the inner surface of the first condensing surface 32
And the second condensing surface 33 and the third condensing surface 34. The first condensing surface 32 is formed into a curved surface, the second condensing surface 33 is formed into an inclined surface, and the third condensing surface 34 is formed into a flat surface, so that the heat rays from the light emitting section 8 are collected into the first collection surface. Light surface 32
The light is condensed on the second light condensing surface 33 and the third light condensing surface 34, and is condensed on the focal hole 35. The heat rays from the light emitting portion 8 of the halogen lamp 6 are condensed by the primary condensing surface 4 and condensed in the focal hole, and further, the first condensing surface which is the secondary condensing surface of the secondary condensing mirror 3. Since the heat rays from the light emitting section 8 condensed by the light surface 32, the second light collecting surface 33, and the third light collecting surface 34 are also condensed on the focal hole, the heat rays condensed on the focal hole 35 are collected. Becomes a very high energy heat ray and is irradiated to the workpiece as spot light. Since the diameter of the focal hole 35 is determined in advance, the high-energy spot light is controlled within the range of the diameter of the focal hole 35 and is not diffused and applied to the workpiece. Of the heat rays from the light-emitting portion 8 of the halogen lamp 6 described above, the heat rays condensed on the outermost condensing surface 15 formed on the outermost side of the primary condensing surface 4 are the outermost heat rays 37. The light is condensed on the focal hole 26. This outermost hot wire 37
Of the first condensing surface 32, so that the outermost heat ray 37, that is, the outermost heat ray 37 does not disturb the path of condensing to the focal hole 35,
The 2nd condensing surface 33 and the 3rd condensing surface 34 are shape | molded, and all the heat rays from the light emission part 8 are condensed and utilized effectively. Of course, the heat rays reflected by the secondary condensing surface 22 to the primary condensing surface 4 are condensed on the focal hole 35. As described above, the heat rays condensed by the primary condensing surface 4 and the secondary condensing surface 22 are condensed and matched to the focal hole 35, so that the energy of the focal hole becomes extremely high. 25 is irradiated as spot light. In the spot light temperature profile 45, as shown in FIG. 1, only the portion corresponding to the diameter of the focal hole 25 has a high temperature, for example, 1200 ° C. or higher, and the other portions have a low temperature. It was confirmed that the material was not diffused larger than the diameter of 35, concentrated heating to the workpiece was achieved, and there was no temperature effect on other parts than the workpiece. One end of the connection pipe 40 is attached near the opening surface of the secondary condenser mirror, and the other end is attached in communication with an air hole 41 provided in the secondary condenser mirror 3. One end of the connection pipe 40 is connected to a compressed air source 43 via an air pipe 42. In the soldering operation, if compressed air from a compressed air source is supplied into the secondary condenser mirror 3 via the air pipe 42, the air is ejected from the focal hole 35. For example, dust generated during the operation Such as impurities can be reliably prevented from entering the focal hole 35 and the secondary condenser mirror 3, and the focal hole 35, the secondary condenser surface 22 and the transparent plate 31 can be prevented from being contaminated, and heat rays can be prevented from deteriorating. It can be Rukoto. In the present invention, the heat rays from the light emitting portion 8 of the halogen lamp 6 are condensed on the primary condensing surface 4 and condensed on the focal hole 35 of the secondary condensing mirror 3 and the secondary condensing surface.
The heat rays condensed at 22 are condensed at the focal hole 35. Thus, in the small-diameter focal hole 35, the primary condensing surface 4 is provided.
Since the heat rays from both the secondary condensing surface 23 and the secondary condensing surface 23 are simultaneously condensed, the focal hole 3 is used as a heat ray having high density energy.
5 is focused and irradiated to the workpiece as spot light. In the present invention, as a modification of the secondary condensing surface 22 of the secondary condensing mirror 3, the entire secondary condensing surface 22 is formed into a flat shape as shown in FIG. Of course, also in the case of this embodiment, the secondary condensing surface 22 is formed outside the outermost heat ray 37 condensed by the outermost condensing surface 15 in the same manner as in the previous embodiment, and the primary condensing surface 4 is formed. Then, the heat rays collected by the secondary condensing surface 23 are collected as extremely high energy into the focal hole 25. Since other structures are the same as those in the above-described embodiment, the same parts are denoted by the same reference numerals and description thereof is omitted. In each of the above embodiments, the focal hole 35 provided at the center of the secondary condenser mirror 3 has the same diameter, but the secondary condenser mirror having focal holes of various diameters. If the secondary condensing mirror 3 is selectively exchanged according to the size of the processed part, spot lights of various sizes can be precisely matched to the processed part by a single power source. The size of the part to be processed is not limited, and a wide range of applications are possible. Furthermore, the solder automatic feeding device and the heater may be combined, and the solder may be automatically supplied to the workpiece via the solder guide nozzle. Furthermore, it can be corrected to the form of a line burner. As described above, the primary condensing mirror having the heat source lamp has a secondary surface with one surface opened and an inner surface formed on the primary condensing surface, and a small focal hole at the center. The collector mirror has an opening on one side and an inner surface formed on the secondary collector surface, and is attached to the opening surface of the primary collector mirror and the secondary collector mirror with a transparent plate detachably attached. The light surface is formed so as to be located outside the light collecting path of the outermost heat ray collected from the primary light collecting surface to the focal hole. Therefore, according to the present invention, the heat rays from the lamp are condensed on the primary condensing surface and are condensed on the secondary condensing surface so as to be condensed and matched with the focal hole. Heat rays are obtained as spot light having extremely high energy. Furthermore, since the primary condenser mirror and the secondary condenser mirror can be attached and detached, the secondary condenser mirror can be appropriately replaced according to the size of the part to be processed. Applicable to parts. Further, in order to join the heel joint surface between the primary condenser mirror and the secondary condenser mirror by clamping with a tightening ring,
Leakage light from the joint surface is prevented, and furthermore, impurities such as dust generated during work are introduced to the secondary collector mirror side by the transparent plate interposed in the joint surface with the primary and secondary collector mirrors. Intrusion can be prevented and air is forced into the secondary condenser mirror to prevent clouding of the secondary condenser surface and transparent plate, and the inside of the condenser surface is always kept clean. be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view with a cross section of a left half of a spot heater. FIG. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is an enlarged cross-sectional view of a joint portion between a primary condenser mirror and a secondary condenser mirror. FIG. 4 is a front view showing another embodiment of the spot heater, with the left half sectioned. [Explanation of Signs] 2 Primary condensing mirror 3 Secondary condensing mirror 4 Primary condensing surface 6 Heat source 8 Light emitting section 16, 18 鍔 19 Fastening ring 22 Secondary condensing surface 26 Joint surface 31 Transparent plate 36 Air pipe 37 Condensing path 40 Connecting pipe 42 Air pipe 43 Compressed air source

──────────────────────────────────────────────────── ─── Continued on the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H05B 3/00 B23K 1/005 B23K 26/00 H05K 3/34

Claims (1)

(57) a primary collector mirror having a lamp [Claims 1] inner surface one side is opened to project the primary condensing formed on the light surface and primary light-condensing plane, one side is opened inner surface transparent but interposed mating surface of the secondary convex mirror having a focal point hole in the center, a primary focusing mirror and secondary collector mirror of secondary convex formed on the light plane and the secondary focus plane arsenide having a plate, and a detachable unit detachably mounting the primary collector mirror and secondary collector mirror of the
The secondary condensing surface of the secondary condensing mirror (3)
The air hole (41) opened in (22) and the air hole (4
1) Force air into the small-diameter focal hole (3
5) having an air supply source (43) to be ejected from the front
In the secondary condensing surface (22) , the outermost heat ray ( 37 ) condensed on the primary condensing surface (4) is condensed on the focal hole (35) of the secondary condensing mirror (3). Shaped so as not to disturb the light collection path
And is collected by the primary and secondary collection surfaces (4, 22).
The heat ray that has been matched is processed from the small-diameter focal hole (35).
Spot type heater characterized by direct irradiation to the part .