JPH0945461A - Lamp heat source device and its condensing mask - Google Patents

Abstract

(57) Abstract: [PROBLEMS] To provide a lamp heat source device having a high light collection rate and high productivity. SOLUTION: A reflecting mirror 20 is provided with a first reflecting surface 21 formed of a part of an ellipse having a large cross section, and the first reflecting surface 21.
And a second reflecting surface 22 that is a circular part that reflects the beam light from the rod-shaped lamp 26 in cross section to the first reflecting surface 21, and is continuous with the second reflecting surface 22, and
The cross section is formed by the first reflecting surface 21 and the third reflecting surface 23 which is a part of a small ellipse having the same focal length.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention reflects the beam light of a rod-shaped lamp by a reflection mirror and condenses it to form a heat source for soldering printed circuit boards to each other or a flat package IC with leads on the printed circuit board. The present invention relates to a lamp heat source device used for soldering etc. and a condensing mask thereof.

[0002]

2. Description of the Related Art Conventionally, as a lamp heat source device, for example, there is a lamp heat source device described in JP-A-1-124985. That is, a first reflecting surface consisting of a pair of vertical surfaces facing each other with a rod-shaped lamp in between, and a top reflecting surface located between the first reflecting surfaces and consisting of a part of a large elliptical cross section, A lamp heat source device having a reflection mirror continuous with the opening edge of the first reflection surface and formed with a second reflection surface formed of a part of a small ellipse in cross section.
Then, in order to protect the part of the object to be heated that has poor heat resistance, a condenser mask having an opening is arranged between the lamp heat source device and the object to be heated, while the so-called cream is applied to the part to be soldered to the object to be heated. Solder is applied, and then the beam light of the rod-shaped lamp is reflected by the reflection mirror to be condensed, and the cream solder is heated and melted by the beam light that has passed through the opening of the condensing mask, thereby soldering. It was

[0003]

However, since the reflection mirror of the above-described lamp heat source device has the first reflection surface composed of a pair of vertical surfaces facing each other with the rod-shaped lamp in between, the light collection rate is low. . Further, since the beam light that cannot pass through the opening of the light-collecting mask is reflected and diffused, the light-collecting rate is further reduced. For this reason, it becomes difficult to locally concentrate the heating by the beam light of the rod-shaped lamp, and it takes a long time to heat and melt the solder, resulting in low productivity.

In view of the above problems, it is an object of the present invention to provide a lamp heat source device having a high light collection rate and high productivity, and a light collection mask therefor.

[0005]

In order to achieve the above-mentioned object, a lamp heat source device according to the present invention is a lamp heat source device in which the beam light of a rod-shaped lamp is reflected by a reflecting mirror and condensed to form a heat source. A reflecting mirror, which is continuous with the first reflecting surface having a part of an elliptical cross section and the first reflecting surface;
In addition, the beam light from the rod-shaped lamp whose cross section is the first is
And a second reflecting surface formed of a part of a circle that is reflected by the reflecting surface.

Further, the reflecting mirror has a first reflecting surface formed by a part of an elliptical shape having a large cross section, and a beam light from the rod-shaped lamp which is continuous with the first reflecting surface and has a cross section. A second reflecting surface formed of a part of a circle that reflects on the reflecting surface, and a second part of a small ellipse that is continuous with the second reflecting surface and has a cross-section with the same focal length as the first reflecting surface. It may be formed with three reflective surfaces.

Further, the reflecting mirror has a first reflecting surface whose cross section is a part of an elliptical shape, and a beam light from the rod-shaped lamp which is continuous with the first reflecting surface and whose cross section is the first reflecting surface. It may be formed by a second reflecting surface that is a part of a circle that reflects the surface and a third reflecting surface that is a vertical surface in a cross section that is continuous with the second reflecting surface.

A condensing mask of the lamp heat source device, which is arranged between the lamp heat source device having a reflecting mirror and the object to be heated, and has an opening through which the beam light emitted from the rod-shaped lamp of the lamp heat source device passes. May be provided with a reflection surface at the edge of the opening of the light-collecting mask, the reflection surface causing the light beam to be multiple-reflected by the reflection mirror and passing through the opening.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION Next, embodiments of the present invention will be described with reference to the accompanying drawings of FIGS. As shown in FIG. 1, the lamp heat source device 10 according to the present invention has a rod-shaped lamp 26 provided in a reflection mirror 20 having a concave groove opened from the lower surface side of the device body 11 as a mirror surface. In the lamp heat source device 10, the light collecting mask 30 shown in FIGS. 5 and 6 is arranged between the lamp heat source device 10 and an object to be heated (not shown) provided on the lower side of the lamp heat source device 10. Is reflected by the reflection mirror 20 to be condensed, and is passed through the opening 31 of the condensing mask 30 to heat and melt the cream solder applied to the object to be heated.

In the lamp heat source device 10, the rod-shaped lamp 26 is positioned in the reflection mirror 20 provided in the main body 11 of the device, both ends thereof are fixed by the fixing plate 12 and the auxiliary plate 13, and the insulator 14 is sandwiched. . Further, the dustproof filter 16 is supported by the support plate 15 assembled to the fixed plate 12. The dustproof filter 16 is for preventing flux or the like generated from solder from adhering to the rod-shaped lamp 26 when the beam light is condensed and heated.

A reflection mirror 20 provided in the apparatus main body 11
As shown in FIG. 3, is continuous with the first reflecting surface 21 formed by a part of an elliptical shape having a large cross section, and the first reflecting surface 21.
Further, the second reflection surface 22 which is a circular part whose cross section reflects the light beam from the rod-shaped lamp 26 to the first reflection surface 21, and the second reflection surface 22 is continuous with the second reflection surface 22. The first reflecting surface 21 and the third reflecting surface 23 formed of a part of a small ellipse having the same focal length.

In particular, the second reflecting surface 22 is formed so that the center of the circle coincides with the first focal point 24 of the first reflecting surface 21. Therefore, the second reflecting surface 22 reflects the beam light of the rod-shaped lamp 26 so as to pass through the first focal point 24 of the first reflecting surface 21 and focuses it on the second focal point 25.

Further, since the third reflecting surface 23 is formed by a part of a small ellipse having the same focal length as that of the first reflecting surface 21, the beam light of the rod-shaped lamp 26 is focused on the second focusing surface. 25 directly reflected.

According to the above-described embodiment, since the one-sided width dimension H ₁ of the reflecting mirror is small, as shown in FIG. 2, the soldering work photographing camera can be arranged more vertically in the production process, and the assembling accuracy is improved. There is an advantage of improving.

Although the reflecting mirror 20 having three curved surfaces has been described in the above embodiment, the present invention is not limited to this. For example, as shown in FIG. 1 reflection surface 21 and this 1st reflection surface 2
1 and a second reflection surface 22 which is a circular part whose cross section reflects the light beam from the rod-shaped lamp 26 to the first reflection surface 21 and a vertical direction which is continuous with the second reflection surface 22. It may be formed with the third reflecting surface 23 which is a surface. According to this reflecting mirror 20, only the first reflecting surface 21 has an elliptical cross section, and the other reflecting surfaces have a semicircular or vertical surface, which facilitates processing and ensures high accuracy. Can be manufactured. Furthermore, since the third reflecting surface 23 is a vertical surface, the width dimension H ₂ thereof is narrower than the width dimension H ₁ of the apparatus body described above. Therefore, there is an advantage that the camera for photographing soldering in the production process can be more easily arranged vertically, and the assembling accuracy is improved.

Examples of the rod-shaped lamp 26 include a halogen lamp and a xenon lamp, the light source of which is the first lamp.
It is mounted in the reflection mirror 20 so as to coincide with the first focal point 24 of the reflection surface 21.

The condenser mask 30 is the lamp heat source device 1.
The beam light of the rod-shaped lamp 26 is disposed immediately below 0 so as not to irradiate an unnecessary portion of the beam light and to prevent the portion from being deteriorated, and a part of the spread beam light is reflected by the reflection mirror 20.
This is to increase the light collection rate by reflecting the light again on the second focal point 25 by reflecting it on the reflection mirror 20 again. That is, as shown in FIGS. 5 and 6, the light-collecting mask 30 has a planar rectangular opening 31 substantially in the center thereof, and the side surface forming the opening 31 reflects the beam light of the rod-shaped lamp 26. To form the first reflecting surface 32 that is focused on the second focus 25, and the opening 3 is formed.
A second reflection surface 33 that multiple-reflects the beam light to the reflection mirror 20 and guides it to the second focal point 25 is provided around the edge portion of 1. The surface of the light collecting mask 30 is plated with gold or the like in order to increase the light collecting rate.

The inclination angles of the first and second reflecting surfaces 32 and 33 provided on the light-collecting mask 30 can be appropriately selected according to the object to be heated. For example, when the opening is rectangular, the first and second The reflection surfaces 32 and 33 are determined by calculating the coordinates of the corner C among the corners A, B, C, and D shown in FIG. When the simulator analysis is performed, it can be evaluated and analyzed by a three-dimensional graph as shown in FIG. From FIG. 6B, it can be seen that the light collection rate tends to increase as the Y dimension increases and the X dimension decreases.

Therefore, when the phase-controlled AC power is supplied to the heater electrode of the rod-shaped lamp 26 to cause the rod-shaped lamp 26 to emit light, the beam light generated from the rod-shaped lamp 26 is reflected by the first and third reflection surfaces of the reflection mirror 20. The beam light reflected by the second reflecting surface 22 is reflected by the first reflecting surface 21, and then the second focal point 2 is reflected.
Go to 5. Then, a part of the light beam emitted from the apparatus body 10 directly passes through the opening 31 of the light collecting mask 30 and directly goes to the second focal point 25, and a part of the light beam is reflected by the first light collecting mask 30. The beam light reflected by the surface 32 toward the second focal point 25, and further reflected by the second reflective surface 33 of the condenser mask 30 is secondarily reflected by the reflection mirror 20 to the second focal point 2.
It is led to 5.

[0020]

【Example】

(Example 1) Focal length 30 mm, major axis 37 mm, minor axis 2
First of which the cross section is a part of an ellipse consisting of 1.6 mm
A reflecting surface and a second reflecting surface having a circular shape with a radius of 7 mm as a sectional shape, and a third elliptical shape having a focal length of 30 mm, a major axis of 32.3 mm, and a minor axis of 12 mm as a sectional shape.
A lamp heat source in which a round rod-shaped halogen lamp having a diameter of 10 mm, a length of 60 mm and an output of 500 W is incorporated into a device body having a reflecting surface and a reflecting mirror having a length of 60 mm and having a length of 60 mm and having a minimum width H ₁ of 14 mm. The light collection rate of the device itself was determined. The results are shown in FIGS. 7 and 8.

(Embodiment 2) Focal length 30 mm, long axis 37
mm, the first reflection surface having a cross section of a part of an ellipse having a minor axis of 21.6 mm, the second reflection surface having a cross section of a part of a circle having a radius of 7 mm, and the third reflection having a vertical surface. And a device body having a minimum width dimension H ₂ of 14 mm, which has a reflecting mirror of 60 mm in length, which is formed by
The light collection rate of a single lamp heat source device incorporating a round rod-shaped halogen lamp having a diameter of 10 mm, a length of 60 mm and an output of 500 W was determined. The results are shown in FIGS. 7 and 8.

(Comparative Example 1) Lamp heat source manufactured by Hibeck Co. in which a focal length of 20 mm, an opening width of 20 mm (minimum piece width dimension 11 mm), a length of 40 mm and a halogen lamp having a length of 40 mm and an output of 380 W are incorporated in a reflecting mirror. Device (H
YL20-4M) was measured for the light-collecting rate. The results are shown in FIGS. 7 and 8.

The light collection rate in FIG. 7 is a calculated value, and the conventional ratio of the light collection rate is a calculated value obtained by correcting the conventional example 1 in consideration of the output difference per unit length. is there. The maximum temperature rise gradient is the maximum gradient in a graph in which the temperature measured by attaching a thermocouple to a glass / epoxy resin plate is the ordinate and the time is the abscissa.

As is apparent from FIG. 7, according to the simulation analysis, although the focal lengths of Examples 1 and 2 are long, the condensing rate of both Examples 1 and 2 is 30 as compared with the conventional example. It turns out that it is more than%. Further, in the first and second embodiments, the focal length is long, and the distance between the apparatus main body and the object to be heated can be made large. Therefore, it is easy to dispose the light-collecting mask between the two and the usability is good. Further, the angle tan ⁻¹ (H ₁ / F), tan for ascending the minimum width portion of the reflection mirror 20 from the second focal point 25 in the first and second embodiments.
^{Since -1} (H ₂ / F) is smaller than that of the comparative example, the camera for photographing the soldering work can be arranged more vertically in the production process, more accurate information can be obtained, and the assembly accuracy is improved. There is.

Further, FIG. 8 is a graph in which the maximum temperature rise gradient is measured along the length direction and the measurement result is graphed. As is clear from FIG. 8 (b), Examples 1 and 2 showed almost the same changes as Comparative Example 1, and it was found that there was practically no difference in the length direction.

(Embodiment 3) A metal flat plate having a thickness of 10 mm has a lower opening having a width of 3.8 mm and a length of 6.6 mm, and the taper surface of the first reflecting surface has an X dimension of 3.5 mm. , A gold-plated light-collecting mask having a Y dimension of 9 mm was placed between the lamp heat source device of Comparative Example 1 and the object to be heated, and the light-collecting rate was measured.

(Comparative Example 2) Except for the fact that a 1 mm-thick metal flat plate was provided with a mere rectangular through hole having a width dimension of 3.8 mm and a length dimension of 6.6 mm to form an opening, the others were carried out as described above. The light collection rate was measured under substantially the same conditions as in Example 3.

Comparing the measurement results, it was found that Example 3 achieved the light collection rate of about 250% of Comparative Example 2. Therefore, the first and second light-collecting masks according to the third embodiment are provided.
It was found that the reflecting surface utilized the beam light more effectively than Comparative Example 2.

[0029]

As is apparent from the above description, according to the lamp heat source device of the first to third aspects of the present invention,
The beam light of the rod-shaped lamp is effectively used, the light collection rate is high,
Since localized centralized heating becomes easy, the time for heating and melting the solder is shortened and the productivity is high. Further, according to the condensing mask of claim 4 of the present invention, the beam light reflected by the reflecting surface provided at the edge of the opening of the condensing mask is again reflected on the object to be heated through the reflecting mirror. Since the irradiation is performed, there is an effect that the light collection rate is further increased and energy can be saved.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a lamp heat source device according to the present invention.

FIG. 2 is an explanatory diagram for explaining a method of using the lamp heat source device according to the present invention.

FIG. 3 is a cross-sectional view showing a device body of a lamp heat source device according to the present invention.

FIG. 4 is a cross-sectional view showing another device body of the lamp heat source device according to the present invention.

FIG. 5 is a perspective view of a light collecting mask used in the present invention.

6A and 6B are explanatory views for showing a light collection ratio of a light collection mask used in the present invention, FIG. 6A is a cross-sectional view, and FIG. 6B is a three-dimensional graph diagram showing analysis results. is there.

FIG. 7 is a chart showing the light collection rates obtained in the examples.

FIG. 8 shows the maximum temperature rise gradient in the length direction,
FIG. 6A is a perspective view showing the measuring method, and FIG. 6B is a graph showing the measurement results.

[Explanation of symbols]

10 ... Lamp heat source device, 11 ... Device body, 20 ... Reflecting mirror, 21 ... First reflecting surface, 22 ... Second reflecting surface, 23 ... Third reflecting surface, 24 ... First focus, 25 ... Second focus, 26 ... rod-shaped lamp, 30 ... condensing mask, 31 ... opening, 32 ... first reflecting surface, 33 ... second reflecting surface.

Claims (4)

[Claims] 1. A lamp heat source device for reflecting beam light of a rod-shaped lamp by a reflection mirror and condensing the light beam as a heat source, wherein the reflection mirror comprises a first reflection surface having a part of an elliptical cross section, and A lamp heat source device, characterized in that it is formed with a second reflecting surface which is continuous with the first reflecting surface and whose cross section reflects the beam light from the rod-shaped lamp to the first reflecting surface and which is a circular part. . 2. A lamp heat source device for reflecting beam light of a rod-shaped lamp by a reflection mirror and condensing the light beam as a heat source, wherein the reflection mirror comprises a first reflection surface formed of a part of a large elliptical section. A second reflecting surface that is continuous with the first reflecting surface and that has a cross section that is a part of a circle that reflects the beam light from the rod-shaped lamp onto the first reflecting surface; and that is continuous with the second reflecting surface, A lamp heat source device having a cross section formed by the first reflection surface and a third reflection surface formed of a part of a small ellipse having the same focal length. 3. A lamp heat source device for reflecting a beam light of a rod-shaped lamp by a reflection mirror and condensing the light beam as a heat source, wherein the reflection mirror comprises a first reflection surface having an elliptical cross section and a first reflection surface. A second reflecting surface which is continuous with one reflecting surface and which is a part of a circle whose cross section reflects the beam light from the rod-shaped lamp to the first reflecting surface; and a vertical surface which is continuous with the second reflecting surface. And a third reflecting surface that forms a lamp heat source device. 4. A condensing mask for a lamp heat source device, which is arranged between a lamp heat source device having a reflection mirror and an object to be heated, and has an opening through which a beam of light emitted from a rod-shaped lamp of the lamp heat source device passes. In the condensing mask of the lamp heat source device, a reflecting surface is provided at an edge portion of the opening of the condensing mask, the reflecting surface is configured to multiple-reflect the beam light to the reflection mirror and pass through the opening. .