JPS60133994A - Mechanism for irradiating beam - Google Patents

Abstract

PURPOSE:To obtain an excellent effect for local heating by turning on and off a shutter part thereby irradiating locally a large output light beam to an object under movement with good accuracy. CONSTITUTION:A mechanism for irradiating a beam irradiates a beam 10 and heats locally a moving object, for example, the lead part 4 of an electronic part 2. A shutter part 11 which turns on and off the beam light 10 as well as the 1st transmission type beam sensor consisting of a light emitting part 6 and a photodetecting part 7 and the 2nd transmission type beam sensor consisting of a light emitting part 8 and a photodetecting part 9 are provided apart from each other by the same distance on the side forward and backward of the axis of the light 10 in the moving direction of the part 2. A control part irradiates the light 10 by opening the shutter part 11 on condition that the 1st transmission type beam sensor detects the final end of the part 2. Said part shuts off the light 10 by closing the shutter part 11 when the 2nd transmission type beam sensor detects the front end of the part 2.

Description

[Detailed Description of the Invention] [Field of Application of the Invention] The present invention relates to a beam irradiation mechanism that heats using an optical beam as a heating source, and particularly to a beam irradiation mechanism that performs local heating using a beam that has a lot of scattered light. This invention relates to a beam irradiation mechanism suitable for heating.

[Background of the invention]

Conventional optical beam heating devices have mainly irradiated a beam continuously regardless of the type of component, and it is safe to say that there is no intermittent irradiation. In other words, when heating a local part of a part using a beam heating device that continuously irradiates a beam as described above, the outside of the irradiated part must be shielded with a mask, or the irradiated part must be positioned on the beam axis and stopped. I felt safe enough to do the irradiation. However, in the former case, masks are attached to each side of the parts, so some parts cannot be automated.
The latter has the disadvantage that the equipment is expensive because high precision is required for moving and stopping the parts.

To be more specific, when shielding with a mask, if the shape of the part is different, it is necessary to prepare a mask with a correspondingly different shape, and if the mounting position of each part is different, different masks must be prepared as well. If you have to do this, you could end up making a huge variety of masks. in this way,
As the number of masks increases, various costs arise, such as mask selection work during irradiation and mask mounting work during automation.

In addition, when fixing the irradiation part and irradiating a local area, move the irradiation beam side to the area you want to irradiate and use the irradiation shutter 1.
1, a function of moving the irradiation beam and a function of highly accurate positioning are required, which naturally has the drawback of making the apparatus expensive.

All of these problems are due to the lack of a shutter mechanism with excellent performance for opening and closing a high-output beam, and in particular, the shutter opening and closing speed (total speed) must be kept below 50 mzac. Shutter opening/closing speed 50m
J? In order to keep it below ec, highly accurate sensing is necessary, but the current mechanical sensing has poor accuracy, and with optical sensing, increasing the sensitivity can cause malfunctions due to scattered light noise of high output beams, etc. [Objective of the Invention] The present invention has been made in view of the above-mentioned problems, and is capable of locally transmitting a high-output beam light without being affected by the shape of the component. The purpose is to provide a beam irradiation mechanism that can perform irradiation.

[Summary of the invention]

The gist of the present invention is to provide first and second transmission type beam sensors arranged at the same distance apart from each other at the rear and front in the direction of movement of the irradiated object along the axis of the beam light. When the beam sensor detects the end of the object to be irradiated, the shutter is opened and the beam light is irradiated to the object to be irradiated, and when the second transmission type beam sensor detects the end of the object to be irradiated, the shutter is closed. The point is that the beam light is blocked and it is possible to locally heat a moving object to be irradiated.

[Embodiments of the invention]

Hereinafter, one embodiment of the present invention will be described based on the drawings.

1 to 3 are diagrams showing an example of a state in which electronic components are soldered onto an insulating substrate using the beam irradiation mechanism according to the present invention, and FIG. 1 is a plan view, and FIG. A-Am in Figure 1
The top sectional view and FIG. 3 are side views. In the figure, reference numeral 1 denotes an insulating substrate with a wiring pattern 3 on the front and back surfaces, and an electronic component 2 is attached to the end of the insulating substrate 1 with its lead portions 4, 4 for wiring on the front and back surfaces of the insulating substrate 10. It is placed with pattern 3 sandwiched therebetween and is soldered. 4 and 5 are enlarged views of the lead portion 4, with FIG. 4 being a front view and FIG. 5 being a side view. As shown in the figure, wiring patterns 3 and lead portions 4 on the front and back surfaces of the insulating substrate 1
and are welded by the solder 5.

FIG. 6 is a front view showing a beam irradiation mechanism used to attach the lead portion 4 to the wiring pattern 3 of the insulating substrate 1. In the figure, 6°8 is a light emitting part,
Reference numerals 7 and 9 indicate light receiving sections provided at corresponding positions above the light emitting section 6.8. The light emitting section 6 and the light receiving section 7 constitute a first transmission type beam sensor, and the light emitting section 8 and the light receiving section 9 constitute a second transmission type beam sensor. The insulating substrate 1 and the electronic component 2 move in the direction of arrow B approximately at the center of the gap between the light emitting sections 6, 8 and the light receiving sections 7, 9 as one body.

10 is a beam of light, and the beam of light 10 is transmitted to the light receiving section 7,
The light is irradiated from the opposite direction to the direction of the beams C and D of the transmission type beam sensor, that is, from above, so as not to be received by the beams 9, and is irradiated onto the lead portion 4 of the component 2 in a condensed state. The distance 11 between the light beam 10 and the first transmission type beam sensor and the distance 12 between the light beam 10 and the second transmission type beam sensor are determined by the scattered light of the high output beam 10. If the sensor malfunctions, make it large enough to prevent deterioration. Further, the values of the intervals @11 and 12 are made equal. 11 is a shutter, and the light beam 10 is turned on and off by opening and closing the shutter 11. The shutter 11 is opened and closed by a rotary solenoid that rotates a rotating shaft 12 at high speed. The key to local irradiation is to open and close the shutter 11 at high speed and with high precision. The rotary solenoid is controlled by a high-speed sequencer. A signal from a first transmission type beam sensor composed of a light emitting section 6 and a light receiving section 7 becomes an open/close signal for the shutter 11, and a signal from a second transmission type beam sensor composed of a light emitting section 8 and a light receiving section 9 is used as an open/close signal for the shutter 11. The beam sensor signal becomes a close signal. Irradiation of the beam light 10 starts when the end of the first transmission type sensor electronic component 2 is detected, and ends when the second transmission type sensor detects the tip of the electronic component 2.

The transmission type beam sensor composed of the light emitting part 6.8 and the light receiving parts 7, 9 may malfunction due to the influence of scattered light of the beam light 1O.As a countermeasure, the light receiving parts 7, 9 are arranged at the top. However, the light emitting sections 6 and 8 are arranged at the bottom, and a special 7-door 13 is provided at the tip of the light receiving section 7.9 to reduce the influence of scattered light.

Furthermore, as shown in FIG. 7, a microswitch 14 for detecting the presence of the electronic component 2 is provided as a third sensor to prevent malfunction. The microswitch 14 is turned on and off by the vibration of a lever 16 having a roller 15 at its tip that rotates while contacting one end of the electronic component. Further, E indicates the position where the lead portion 4 is irradiated with the beam light 10.

Next, the operation when the insulating substrate 1 moves in the direction of arrow F in FIG. 7 will be explained based on the timing chart in FIG. 8. In FIG. 8, Sl is the output signal of the microswitch 14, S2 is a signal outputted with a delay of T1 from the output signal of the microswitch 14, S3 is the output signal of the light receiving section 7, and S4 is the output of the light receiving section 7. The signal 5out is the opening/closing signal of the shutter 11, and the signal S5 is the output signal of the light receiving section 8. First, when the roller 15 contacts the electronic section 2 and presses the lever 16, the microswitch 14 is turned on and the output signal S1 rises (see Figure 8). When the beam B of the first transmission type beam sensor is blocked by the electronic component 2, an output signal S3 rises from the light receiving section 7 (see the beginning of FIG. 8). The high level of the output signal S1 is at time T1
When the output signal S2 continues for a time T2, the output signal S2 rises (see FIG. 8), and similarly, when the high level of the output signal S3 continues for a time T2, the signal S4 rises (see the beginning of FIG. 8).

In this state, next, the first
When the transmission type beam sensor detects the end of the electronic component 2, the output signal S3 falls (see FIG. 8). When the fall of this output signal S3 occurs, the opening/closing signal S of the shutter 11
oμt starts up (see FIG. 8), drives the rotary solenoid, and opens the shutter 11 at high speed. Next, when a second transmission type beam sensor composed of a light emitting section 8 and a light receiving section 9 detects the electronic component 2 illuminated by the beam light 10, an output signal S5 is generated at the rising edge of 9 and an opening/closing signal of the shutter 11. The SOwl falls (see the opening in FIG. 8), the shutter 11 is closed, and the irradiation of the beam light 10 is completed.

The electronic components 2 include those of various sizes, those that require irradiation, and those that do not. As described above, it is detected that the output signal S1 has continued for the time T1, and the signal S2 is
By emitting irradiation, it is possible to detect only the electronic components 2 that require irradiation.

Furthermore, by detecting that the high level of the output signal S3 continues for a time T2 in the first transmission type beam sensor composed of the light emitting part 6 and the light receiving part 7, the beam irradiation is performed by outputting a multi-signal S4. It is possible to double check the electronic component 2 that should be selected. Erroneous irradiation of the beam light 10 due to malfunction of the sensor can be prevented as much as possible.

As explained above, according to the above embodiment, the beam light 1
Since the lead portion 4 of the electronic component 2 can be irradiated with 0 with high accuracy, using this technique it becomes possible to locally heat a moving object to be irradiated.

Therefore, it is also possible to directly incorporate this beam irradiation mechanism into an automated line or device. Moreover, the beam directions C and D of the transmission type beam sensor are the beam light 1.
Since the special hood 13 is provided at the tip of the light receiving section 7.9, malfunction of the transmission type beam sensor due to the beam light 100 can be prevented as much as possible.

Furthermore, in order to reliably uH the parts that require irradiation, a microswitch 14 is provided as a third sensor, and multiple check mechanisms are provided to prevent malfunctions, so that the beam light may not be irradiated on the wrong part by mistake. This prevents parts from burning out due to abnormal operation.

In addition, in the above hero example, the rotation axis 1 of the shutter 11
Although the description has been made using an example in which the drive in step 2 is performed by a rotary solenoid, the present invention is not limited to this, and a motor or the like may be used. Further, the shutter 11 is not limited to one having a structure in which the horizontal rotary shaft 12 rotates, but may also be a structure in which the shutter horizontally rotates on a vertical shaft, or a sliding shutter. good.

〔Effect of the invention〕

As explained above, according to the present invention, it is possible to irradiate a moving object with a high-output light beam locally with high precision by turning the shutter section on and off, which is excellent in local heating of a moving object. You can get the same effect.

[Brief explanation of the drawing]

Figures 1 to 3' are diagrams showing an example of a state in which electronic components are soldered to an insulating board. Figure 3 is a side view, Figures 4 and 5 are enlarged views showing the soldered state of the leads of electronic components, Figure 6 is a front view showing the schematic configuration of the beam irradiation mechanism, and Figure 7 is FIG. 8 is a timing chart for explaining the beam irradiation mechanism. DESCRIPTION OF SYMBOLS 1... Insulating board, 2... Electronic component, 3... Wiring pattern, 4... Lead part, 5... Solder, 6.
8... Light emitting section, 7.9... Light receiving section, 10...
Beam light, 11... Shutter, 12... Rotation axis, 1
3...Special hood, 14...Micro switch. Figures 1, 2, O, 3, Figure 4, O, 5, and 6

Claims (1)

[Claims] (1) In a beam irradiation mechanism that locally heats a moving object by irradiating a beam of light, a shutter section that turns on and off the beam of light, and a rear part of the object in the direction of movement of the object from the axis of the beam of light. and a first and second transmission type beam sensor disposed in front of the object by the same distance, and the shutter section is opened on the condition that the first transmission type beam sensor detects the end of the object. A beam irradiation mechanism, comprising: a control section that opens the shutter to irradiate the beam light, and closes the shutter to cut off the beam when the second sensor detects the tip of the object.