JP3003206U - Soldering iron with temperature adjustment function - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a soldering iron that does not cause quality control problems and can be used in various work environments without preparing various types of soldering irons. [Structure] Iron tip 1 and grip 5 held during work
A heating part 11b for heating the iron tip 1, a temperature sensor part 11a for detecting the temperature of the iron tip 1, and a temperature sensor part 11
Solder including a control unit that compares the output value of a with the reference value and controls the heating unit 11b so that they match each other, and a circuit board 12 that is inserted into the grip 5 and receives supply of an AC power supply voltage. In addition, a resin-molded fixed resistor R _PN , a connection pin PN protruding from the circuit board, and an opening hole 5b through which the fixed resistor R _PN can pass are further provided.
The fixed resistor R _PN can be detachably attached to the connection pin PN through the opening 5b.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a soldering iron used when soldering electronic components to a circuit board, etc., and is particularly suitable for soldering work with high quality control standards, and the iron tip temperature can be arbitrarily set and changed. It is about the soldering iron.

[0002]

[Prior art]

 If the soldering iron temperature of the soldering iron varies widely from product to product, a very big problem will occur in quality control in the soldering production line. That is, if the soldering temperature is low, the time required for the soldering work will be long and the efficiency will be reduced, while if the soldering temperature is high, the elements such as high-density integrated circuits with low heat resistance will be adversely affected. Will result in defective soldering. Furthermore, if the temperature of the iron tip exceeds 400 °, oxides are likely to be generated on the iron tip, and this oxide adversely affects the soldering point, or the oxide tip covers the iron tip and functions as a soldering iron. It may not be done.

From the above, it is necessary to perform the soldering work at a temperature most suitable for the target work. However, in general, a soldering iron with a temperature adjusting function is equipped with a temperature sensor for detecting the iron tip temperature and a heater part. And a control circuit for controlling the supply power. In such a soldering iron, the control circuit sequentially compares the iron tip temperature with the set temperature and controls them so that they coincide with each other. This control circuit is stored in the handle part of the soldering iron and the soldering iron There is a type that is stored in the station section that is placed between the iron and the AC power supply.

In addition, there are two types of soldering irons that house a control circuit in the handle part, one in which the set temperature cannot be changed unless the control board is operated, and one in which a semi-fixed resistance is provided through an opening provided in the handle part. There was a thing that the set temperature could be freely changed continuously by turning. The temperature control knob of the station type control circuit can also be used to freely change the set temperature.

[0005]

[Problems to be solved by the device]

 However, with the type that can change the set temperature freely and continuously, the worker may change the set temperature only for the convenience of soldering work, which may cause an important problem in quality control. was there. That is, if the work is delayed, the set temperature may be increased by itself in order to increase the work speed, which increases the work speed, but the product quality may vary and the quality may be poor. It will lead to a change, and there is a great problem.

On the other hand, the above-mentioned problem does not occur in the type in which the set temperature cannot be changed, but when the contents of the extra soldering work greatly change for each small lot, it is suitable for the soldering work each time. It was very uneconomical, such as having to prepare a soldering iron.

The present invention has been made by paying attention to these problems, there is no problem in quality control, and various kinds of soldering irons are not required. The purpose is to provide a soldering iron that can handle the work environment of.

[0008]

[Means and Actions for Solving the Problems]

 In order to achieve the above-mentioned object, a soldering iron with a temperature adjusting function according to the present invention has a trowel tip that contacts an object to be worked, and a hollow grip that is connected to the trowel tip and is held during work. Part, a heating part that heats the iron tip, a temperature detecting part that detects the temperature of the iron tip, and an output value of the temperature detecting part and a reference value are compared, and the heating part is matched so that they match. In the soldering iron including a control unit for controlling the control unit and a circuit board that is inserted in the grip unit with the control unit placed and receives an AC power supply voltage, a circuit element that determines the reference value. A fixed resistor that is a barrel resistance element and is resin-molded except for the lead-out terminal, a connecting pin that is projectingly provided on the circuit board and that can be fitted with the lead-out terminal, and a projecting portion of this connecting pin. Corresponding to the position An opening hole formed in the lip portion and having a size through which the fixed resistor can pass is further provided, through which the fixed resistor can be detachably attached to the connection pin through the opening hole. ing. If you want to change the temperature of the iron tip, first pull out the fixed resistor through the opening. After that, a fixed resistor corresponding to the temperature of the iron tip to be changed may be selected, and the lead-out terminal and the connection pin may be fitted again through the opening hole.

In the present invention, a color or a number indicating the temperature of the iron tip may be displayed on the surface of the fixed resistor, which is preferable because the operator can recognize the temperature of the iron tip. .

Further, the AC power supply voltage may be stepped down to a predetermined voltage by a transformer and then supplied to the circuit board. If this is done, the AC power supply and the soldering iron are not directly connected electrically, It is preferable in preventing leakage current from the beginning. Furthermore, the surface of the fixed body may be covered with a transparent cover to protect it when the fixed resistor is attached to the connection pin.

[0011]

【Example】

 Hereinafter, the present invention will be described in more detail based on examples. FIG. 1 (a) is an external view of a soldering iron according to an embodiment of the present invention, and FIGS. 1 (b) and 2 are a part of the internal structure of the soldering iron of FIG. Is shown in detail.

In appearance, this soldering iron has a soldering iron tip 1, a protective pipe 2, a cap nut 3, a nipple 4, a grip portion 5, a cord bush 7 for covering the AC cord 6, and an AC outlet. It is composed of 8 etc. The clip portion 5 is formed with a cylindrical first opening 5a and a second opening 5b, an LED serving as an energizing lamp is inserted into the first opening 5a, and a second opening 5b is provided. A resin-molded resistor R _PN is inserted. Moreover, a part of the grip portion 5 is covered with a heat insulating cover 9.

The support pipe 10 is housed in the protection pipe 2, and one end 10 a of the support pipe 10 is locked by the cap nut 3. The cap nut 3 and the nipple 4 are fixed by being screwed. The iron tip 1 is replaced by removing the cap nut 3 from the nipple 4.

A heater 11 is inserted in the iron tip 1, and the heater 11 is provided with a temperature sensor portion 11a at the tip end and a heating portion 11b at the substantially central portion. The temperature sensor unit 11a and the heating unit 11b are connected to the temperature control board 12, respectively. The temperature control board 12 is positioned by the locking end 12 a and is housed in the grip portion 5. The temperature control board 12 is provided with a connection pin PN for mounting the resistor R _PN. The connection pin PN is provided in the second opening 5b with the temperature control board 12 positioned. It is adapted to the position. Further, an LED (not shown) is also connected to the temperature control board 12, and the arrangement position of the LED is aligned with the position of the first opening 5a.

FIG. 3 is a schematic view showing a state in which the fixed resistor R _PN is mounted. The fixed resistor R _PN is connected to the temperature control board 12 via the second opening 5b. It is detachably attached to the pin PN. As shown in FIG. 3B, the fixed resistor R _PN is a resistor element R molded with resin, and two lead terminals of the resistor element R are electrically connected to the receptacles 13 and 13, respectively. ing. As described above, since the temperature control board 12 is provided with the connection pin PN having a thickness corresponding to the openings of the receptacles 13 and 13, the state in which the fixed resistor R _PN is attached to the connection pin PN is shown. Then, the resistance element R functions as a part of the circuit of the temperature control board 12.

As the fixed resistor R _PN , the set temperature is clearly indicated on the surface thereof, and those having 300 °, 330 °, 360 °, 390 °, 420 ° or the like are prepared. Note that the set temperature need not be limited to a numerical value, and a specific iron tip temperature may be specified by a color such as black, brown, red, orange, yellow, green, or blue. Also, characters, figures, symbols, etc. may be used as appropriate.

FIG. 4 illustrates an example of the temperature control circuit, and illustrates an example of a circuit on the temperature control board 12. This circuit controls the power supplied to the heating unit 11b of the heater 11 by controlling the phase of AC100V supplied from the outlet 8 by the triac TRC, and connects the bridge unit 2 between the input terminals P1 and P2. 0, the control IC 21, the rectification unit 22, and the like are connected to each other.

The rectifying unit 22 is composed of a rectifying diode D1, a resistor R1 and a capacitor C1, and obtains a DC voltage across the capacitor C1 by rectifying AC100V.

The bridge portion 20 is composed of a resistor R2, a semi-fixed resistor VR1, a resistor R3, a resistor R4, a resistor R5 and the like. Here, the temperature sensor section 11a of the heater 11 is connected in parallel to both ends of the resistor R5. A connection pin PN is provided on one side of the bridge, and a fixed resistor R _PN having a resistance value R corresponding to the set temperature is attached to the connection pin PN. Note that capacitors C2 and C3 are connected to both ends of the resistor R3 and the resistor R5.

The output voltage of the bridge unit 20 is supplied to the control IC 21 via the resistors R6 and R7, and the output of the control IC 21 is supplied to the gate terminal of the triac TRC via the resistor R8. . A capacitor C4 is connected between the 5th terminal and the 7th terminal of the control IC 21, and a capacitor C5 and a resistor R9 are connected to the 8th terminal of the control IC 21. The resistor R10 and the light emitting diode LED are connected to the sixth terminal of the control IC 21. As described above, the light emitting diode LED functions as an energizing lamp and is fitted into the first opening 5a of the grip portion 5.

Next, a method of use and a circuit operation of the soldering iron having the above-described structure will be described. Now, assuming that you want to use this soldering iron with the iron tip temperature set to T ° C, select one of the fixed resistors R _PN that has multiple types and specify “T °”, This is attached to the connection pin PN.

When the soldering iron is energized, the heating unit 11b is heated via the triac TRC. At this time, the resistance value of the temperature sensor unit 11a changes according to the temperature of the iron tip 1, so that a voltage corresponding to the temperature of the iron tip 1 is obtained from the bridge unit 20.

The voltage obtained from the bridge portion 20 has a value corresponding to the difference between the set temperature T and the iron tip temperature. By the detection voltage being applied to the control IC 21 via the resistors R6 and R7, The control IC 21 controls the phase of the triac TRC to maintain the iron tip temperature at the set temperature T.

When it is desired to change the set temperature of the soldering iron, the fixed resistor R is passed through the second opening 5b of the handle portion 5._PNAfter removing the R, another fixed resistor R with the required set temperature is clearly indicated. _PN May be inserted from the second opening 5b. As shown in FIG. 3, the fixed resistor R_PNSince the head portion of the soldering iron slightly projects from the surface of the handle portion 5 of the soldering iron, the fixed resistor R_PNIs easy to replace.

Next, another embodiment of the present invention will be described. FIG. 5A is a schematic view showing another embodiment, and FIG. 5B is a circuit diagram showing only a portion different from FIG. As is apparent from FIG. 5, this embodiment is characterized in that the intermediate box BX is provided between the outlet 8 and the input terminals P1 and P2. The fuse F, the transformer T, and the triac TRC are housed in the intermediate box BX. The transformer T is for converting, for example, AC100V into AC24V.

In this embodiment, since the intermediate box BX is provided and the soldering iron part and the AC power source are magnetically connected through the transformer T, the AC 100 passes through the inside of the soldering iron and It is preferable in that there is no risk of leakage from the tip 1. Even when the AC power supply voltage is other than 100V, the voltage of the input terminals P1 and P2 can be set to a predetermined value (for example, 24V) by changing the transformer T, so that the control circuit board 12 can be used without changing the voltage. It also has the advantage of being compatible with the product.

In the above description, the fixed resistor R _PN is mounted in the exposed state, but the invention is not limited to this. For example, the mounting portion of the fixed resistor R _PN may be protected by slightly covering the grip portion 5 with a rectangular transparent cover. In this case, the grip portion 5 is provided with two engaging grooves extending in the axial direction (surrounding the second opening 5b), and both ends of the transparent cover are engaged with the engaging grooves. It may be slid to be detachably fixed to the heat insulating cover 9 or the like. When the transparent cover is covered, the mounting part of the fixed resistor R _PN is protected, while when the fixed resistor R _{PN is} to be replaced, the transparent cover that engages with the engaging groove should be placed in the opposite direction to the above. Just slide it.

FIG. 6 illustrates another embodiment, and shows an example in which the second opening portion 5b of the grip portion 5 is provided with a changeover switch 30 which is a so-called rotor switch. The changeover switch 30 is provided with an operating section 30a, and by turning the operating section 30a, the position is discontinuously switched to a position indicated as 300 °, 350 °, 400 °, 450 ° or the like. It is like this. The circuit diagram of the portion of the changeover switch 30 is as shown in FIG. 6B, and the resistance value between the connection pins PN (between PN1 and PN2) shown in FIG. 4 changes according to the rotation of the operation portion 30a. It will be switched to r1, r2, r3, r4 ....

In the case of this embodiment, it _suffices to rotate the operating portion 30a instead of exchanging the fixed resistor R _PN . It has the advantage of being easy to change.

[0030]

[Effect of device]

 As described above, the soldering iron with a temperature adjusting function according to the present invention mainly changes the iron tip temperature by replacing the fixed resistor through the opening hole. In other words, the temperature of the iron tip cannot be changed freely by the operator, so there is no problem in quality control. If multiple types of fixed resistors are prepared, multiple soldering iron temperatures can be obtained with the same soldering iron, which is convenient because it is possible to respond appropriately to changes in soldering work.

[Brief description of drawings]

FIG. 1 illustrates a soldering iron according to an embodiment of the present invention.

FIG. 2 is a detailed view showing a part of the soldering iron of FIG.

FIG. 3 is a schematic view of a part of the soldering iron of FIG.

4 is a circuit diagram showing an internal circuit of the soldering iron of FIG. 1. FIG.

FIG. 5 is a schematic view of another embodiment of the present invention.

FIG. 6 is a schematic view showing still another embodiment of the present invention.

[Explanation of symbols]

1 Iron tip 5 Grip part 5b Opening hole 11 Heater 11b Heating part 11a Temperature sensor part (temperature detection part) 12 Control circuit board (control part etc.) R _PN fixed resistor PN connection pin

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[Procedure amendment]

[Submission date] May 16, 1994

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 3

[Correction method] Change

[Correction content]

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 4

[Correction method] Change

[Correction content]

Claims (5)

[Scope of utility model registration request] 1. A trowel tip that comes into contact with an object to be worked, a hollow grip portion that is connected to the trowel tip and that is held during work, a heating portion that heats the trowel tip, and the trowel tip The temperature detection unit for detecting the temperature of the, and a control unit for comparing the output value of the temperature detection unit and the reference value to control the heating unit so that they match each other In a soldering iron including a circuit board that is inserted into the grip portion and receives supply of an AC power supply voltage, a resistance element that is a circuit element that determines the reference value,
A fixed resistor that is resin-molded except for the lead-out terminal, a connection pin that is projectingly provided on the circuit board and can be fitted with the lead-out terminal, and the grip corresponding to the projecting position of the connection pin. And an opening hole having a size through which the fixed resistor can pass, the fixed resistor can be detachably attached to the connection pin through the opening hole. A soldering iron with a temperature adjustment function, which is characterized by that. 2. The fixed resistor has colors, numbers and the like displayed on its surface, and the colors and numbers clearly indicate the iron tip temperature controlled by the controller. The soldering iron with a temperature adjusting function according to claim 1. 3. The soldering iron with a temperature adjusting function according to claim 1, wherein the AC power supply voltage is reduced to a predetermined voltage by a transformer and then supplied to the circuit board. 4. The temperature control according to claim 1, wherein a surface of the fixed body is covered with a transparent cover when the fixed resistor is attached to the connection pin. Functional soldering iron. 5. A trowel tip that contacts an object to be worked, a hollow grip portion that is connected to the trowel tip and is held during work, a heating portion that heats the trowel tip, and the trowel tip A temperature detection unit that detects the temperature of the temperature detection unit, a control unit that compares the output value of the temperature detection unit and a reference value and controls the heating unit so that they match each other, and with this control unit placed. In a soldering iron including a circuit board that is inserted into the grip portion and is supplied with an AC power supply voltage, a resistance element that is a circuit element that determines the reference value,
A plurality of resistors, each of which is arranged on the circuit board corresponding to a plurality of reference voltages and has one end electrically connected, and a plurality of switching contacts and one A switch member in which a connection relationship with a fixed contact is switched, the switching contact is connected to the other end of each of the resistors, and the fixed contact is connected to the control unit to determine the reference value; The grip portion further includes an opening hole for rotatably accommodating the rotor of the switch member, so that the temperature of the iron tip can be arbitrarily and discontinuously adjusted by the rotation of the rotor. A soldering iron with a temperature adjustment function that is characterized.