JP2003324001A - Resistor and lamp lighting device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a resistor used for a lamp lighting device which causes no trouble even if it is heated up to a high temperature, and to realize the lamp lighting device which uses the above resistor, has a simple circuit structure, is small in size, and capable of preventing a lamp inrush current. <P>SOLUTION: The resistor 1 is equipped with a hermetically closed quartz tube 2 provided with sealers 5, a resistive material 3 which is arranged in the quartz tube 2 and at least partially formed of Kanthal or Nichrome, internal lead rods 4 connected to the ends of the resistive material 3, external lead rods 7 which are electrically connected to the internal lead rods 4 respectively with the sealers 5 and led out from the quartz tube 2. The quartz 2 is filled with inert gas or kept in vacuum, and the resistive material 3 is hermetically sealed up in the quartz tube 2. The lamp lighting device is equipped with a circuit which supplies a power supply to the resistor 1 and an incandescent electric lamp which are connected in series and another circuit which supplies the power supply to the incandescent electric lamp, and the two circuits can be switched from one to another. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resistor and a lamp lighting device using the resistor, which is used for heating or cooking semiconductor substrates, glass, resin, heat rollers for printers and the like.

[0002]

2. Description of the Related Art As a heat lamp used for heating or cooking, an incandescent lamp using a tungsten filament as a heating element is usually used. In the lighting circuit for lighting such an incandescent lamp,
When a power supply voltage is applied to the incandescent lamp, a rush current that is several to several tens of times that of the steady state instantaneously flows into the lighting circuit simultaneously with the application of the power supply voltage. Such an inrush current puts a large load on the lighting circuit, resulting in the problem of damaging the circuit components.

Conventionally, in order to avoid such a problem,
A method of incorporating a voltage control circuit into the lighting circuit to control the voltage applied to the incandescent lamp at the time of lighting to gradually increase the inrush current, and the lighting circuit includes an electric resistance element such as an NTC thermistor or a fixed resistor. A method of incorporating the same to suppress the inflow of inrush current at the initial stage of lighting the lamp is adopted.

[0004]

However, in the former method, since the voltage control circuit for controlling the voltage is generally expensive, it is necessary to incorporate such a circuit in addition to the lamp lighting circuit. The cost of the entire device is expensive, and since such a circuit requires a relatively large installation space, the entire lamp lighting device becomes large in size, which is not practical.

Further, in the latter method, when a fixed resistor is used, there is an advantage that the lamp lighting device can be constructed relatively inexpensively, but in order to suppress the inrush current,
It was necessary to pass a current through the fixed resistor for at least 0.2 seconds. However, in the case of a lamp lighting device that controls the ON-OFF of an incandescent lamp, since the ON time is frequently performed, there is no time for the fixed resistor to cool down, and the fixed resistor gradually heats up and eventually fails. There was a problem that it would end up. That is, elements such as ceramic resistors are used for fixed resistors, but these are vulnerable to thermal shock such as temperature shock at high temperature and may be cracked, or resin may be part of the fixed resistor components. The resin used has a problem that the resin melts and cannot be used.

Further, since the fixed resistor and the thermistor are excessively heated due to self-heating, it is necessary to take measures so as not to have a thermal influence on the surroundings. Since a predetermined heat radiation space is required inside, the lamp lighting device has been increased in size.
Furthermore, since the resistor itself may be damaged, it is necessary to increase the heat capacity of the resistor, and the resistor must be increased, resulting in an increase in size of the lighting device.

In view of the above-mentioned various problems of the prior art, an object of the present invention is to provide a resistor for a lamp lighting device which does not cause a problem even when the temperature becomes high, and a circuit configuration using the resistor. Another object of the present invention is to provide a lamp lighting device which is simple and can be downsized, and which prevents a lamp inrush current.

[0008]

The present invention employs the following means in order to solve the above problems. A first means is, as a resistor, a quartz tube in which a sealed portion is formed and hermetically sealed, and a resistor material which is disposed in the quartz tube and at least a part of which has kanthal or nichrome. , Internal lead rods connected to both ends of this resistance material,
An outer lead rod electrically connected to the inner lead rod in the sealing portion and led out to the outside of the quartz tube, and the inside of the quartz tube is filled or vacuumed with an inert gas, and the resistance material Is airtightly sealed inside the quartz tube.

A second means is, as a lamp lighting device, a circuit for connecting a power source to the resistor and the incandescent lamp according to claim 1, which are connected in series, and a circuit for connecting the power source to the incandescent lamp. Is provided so as to be switchable.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a diagram showing a configuration of a resistor used in the lamp lighting device according to the present invention. In the figure, 1 is a resistor, 2 is a quartz tube, 3
Is a resistance material made of cantal, nichrome or the like formed in a coil inside the quartz tube 2 and having a larger specific resistance value than tungsten at room temperature. Reference numeral 4 is an internal lead rod made of a refractory metal drawn from both ends of the resistance material 3. 5 is a sealing portion provided at both ends of the quartz tube 2, 6 is a sealing metal foil formed in the sealing portion 5, and 7 is electrically connected to the internal lead rod 4 via the sealing metal foil 6. An external lead rod 8 made of a high melting point metal such as a tungsten rod that is connected and drawn out of the sealing portion 5 is a chip tube used to form a predetermined vacuum space or gas space inside the quartz tube 2.

As described above, in the resistor 1, both ends of the quartz tube 2 are pinch-sealed to form the sealing portions 5, which are hermetically sealed, and the inner space of the quartz tube 2 is vacuumed. It is formed in a state or filled with an inert gas, and the resistance material 3 made of canthal or nichrome is wound in a coil shape and stored in the internal space thereof.
Further, one end of the internal lead rod 4 is connected to both ends of the resistance material 3, and the other end thereof has a sealing metal foil 6 embedded in the sealing portion 5.
Of the sealing metal foil 6 is connected to the external lead rod 7, and the external lead rod 7 projects from the sealing portion 5 and is led to the outside.

Since the resistor 1 is constructed as described above,
The coiled resistance material 3 self-heats when energized, but is sealed inside the quartz tube 2 and is not exposed to the outside, and the inside of the quartz tube 2 is in a vacuum state or filled with an inert gas. Therefore, the material forming the resistance material 3 is not oxidized and hardly deteriorates. Therefore, it is possible to reduce the thermal adverse effect due to the heat generation of the resistance material 3.

FIG. 2 is a diagram showing temperature characteristics of specific resistance values of tungsten, iron, kathal and nichrome.
As shown in the figure, tungsten has an extremely small specific resistance value at room temperature, but the specific resistance value sharply increases as the temperature rises. On the other hand, Kanthal and Nichrome show a high specific resistance value at room temperature and a value that does not change much even when the temperature rises.

FIG. 3 (a) is a diagram showing the configuration of a lamp lighting device constructed by using the resistor 1 made of the above-mentioned Kanthal or Nichrome, and FIG. 3 (b) is the same as FIG. 3 (a). It is a figure which shows the time chart of switching element SSR1 and SSR2. In FIG. 3A, 11 is a power supply, and 12 and 13 are switching elements SSR whose switching is controlled by a signal voltage applied between terminals V and GND.
(Solid state relay), 14 is an incandescent lamp used as a heat lamp for heating or cooking semiconductor substrates, glass, resin, heat rollers for printers, etc., using a tungsten filament as a heating element. There is.

Next, the operation of this lamp lighting device will be described with reference to FIG.
This will be described with reference to (a) and FIG. 3 (b). In this lamp lighting device, first, the power supply 11 is turned on, and further,
As shown in FIG. 3B, a signal voltage is input from the terminal V1-GND to turn on the switching element SSR12,
When a signal voltage is input from the terminal V2-GND and the switching element SSR13 is turned off, the power source 11 switches the switching element SSR12, the resistor 1, and the incandescent lamp 1.
Lamp current flows through the 4 tungsten filament. Here, at least a part of the resistor 1 is made of the resistance material 3 made of kanthal or nichrome, and the incandescent lamp 14 is made of a tungsten filament having a low resistance value at room temperature. , Most of the power supply voltage is applied to the resistor 1,
Almost no application to the incandescent lamp 14. Therefore, the inrush current flowing into the incandescent lamp 14 at the initial lighting of the lamp is suppressed.

In the initial lighting of the lamp, the incandescent lamp 1
Although the current flowing through the lamp 4 is relatively small, the tungsten filament of the incandescent lamp 14 is heated by energization, and the resistance value thereof gradually increases. As shown in FIG. 3B, when the tungsten filament is heated by energization and its resistance value reaches an appropriate value, that is, when the current flowing through the incandescent lamp 14 reaches an appropriate value. As described above, when the switching element SSR12 is turned off and the switching element SSR13 is turned on, almost the entire power source voltage is applied to the incandescent lamp 14 without applying the power source voltage via the resistor 1. At this point of time, the incandescent lamp 14 is heated and the resistance value of the tungsten filament has risen to an appropriate value. Therefore, the incandescent lamp 14 flows into the incandescent lamp 14 with an appropriate value that does not cause an excessive inrush current. Can be made.

FIGS. 4 and 5 are graphs showing a lamp current characteristic in a lamp lighting device in which no measure for preventing inrush current inflow is taken and a lamp current characteristic in the lamp lighting device according to the invention of the present embodiment. .

As shown in FIG. 4, in a lamp lighting device in which measures for preventing the inrush current inflow are not taken, when a power supply voltage is applied to the incandescent lamp, an excessive inrush current flows into the incandescent lamp at the initial stage of lighting. However, its magnitude reaches about 8.13 times the lamp current in the steady state.

On the other hand, as shown in FIG. 5, in the lamp lighting device of the present embodiment, when the power supply voltage is applied to the incandescent lamp 14 via the resistor 1, the lamp current at the initial stage of lighting the lamp is The magnitude can be limited to about 2.25 times the lamp current in the steady state, and an excessive inrush current can be suppressed. Further, after a lapse of a predetermined time after the power is turned on, for example, after about 0.42 seconds as shown in FIG.
As shown in (b), the switching element SSR12 is turned off.
Immediately after FF and switching the switching element SSR13 to ON, the magnitude of the lamp current is about 2.13 times the lamp current in the steady state. in this way,
According to the invention of this embodiment, an excessive rush current can be effectively suppressed during the entire inflow period of the lamp current.

FIG. 6 is a diagram showing the characteristics of the inrush current ratio (rush current in the initial stage of lamp lighting / lamp current in the steady state) with respect to the resistance ratio (kanthal resistance value / tungsten resistance value). Here, the Kanthal resistance value and the Tungsten resistance value are respectively the resistance values of the Kanthal resistor and the tungsten filament of the incandescent lamp in the lamp lighting device of the present embodiment. The Kanthal resistance value and the tungsten resistance value are values at room temperature.

By using such a characteristic curve, it is possible to know how much the resistance value of the Kanthal resistor should be set for the tungsten filament of the incandescent lamp when designing the lamp lighting device. For example, in the figure, when the allowable inrush current magnification is 6.5 times or less,
It is understood that the resistance ratio should be set to approximately 1 or less. Further, when the resistance ratio is about 11.2 or more, the inrush current multiplying factor is about 1.0, which is in a saturated state, and it is understood that it is not necessary to further increase the resistance ratio.

[0022]

According to the first aspect of the present invention, a resistor is provided with a quartz tube in which a sealing portion is formed and hermetically sealed, and at least a part of the quartz tube is made of kanthal or nichrome. A resistor material, an internal lead rod connected to both ends of the resistor material, and an external lead electrically connected to the internal lead rod in the sealing portion and led out of the quartz tube. Since the quartz tube is provided with a rod and is filled or vacuumed with an inert gas, and the resistance material is airtightly sealed inside the quartz tube, the material forming the resistance material is not oxidized, There is almost no deterioration, and it is possible to reduce the adverse thermal effects due to the heat generation of the resistance material. In addition, even if the power is frequently energized and the temperature is increased, it is possible to prevent the occurrence of problems such as the conventional thermistor and the fixed resistor. That is, even when the resistor of the present invention is used in a lamp lighting device for ON / OFF control, it is possible to avoid damage due to thermal shock such as temperature shock at a high temperature like a fixed resistor.

According to a second aspect of the invention, the lamp lighting device is connected in series to the resistor and the circuit for connecting the power source to the incandescent lamp, and the incandescent lamp. Since the circuit for connecting the power supply is provided so as to be switchable, a special space for heat radiation such as a conventional fixed resistor or thermistor is required as compared with the lamp lighting device of the present invention which does not use the resistor. And not because
The resistor can be compactly arranged in the device, and the lamp lighting device can be downsized.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration of a resistor used in a lamp lighting device according to the present invention.

FIG. 2 is a diagram showing temperature characteristics of specific resistance values of tungsten, iron, kathal, and nichrome.

FIG. 3 is a diagram showing a configuration of a lamp lighting device configured using the resistor shown in FIG. 1 and a time chart of SSR1 and SSR2.

FIG. 4 is a diagram showing a lamp current characteristic in a lamp lighting device in which a measure for preventing an inrush current inflow is not taken.

FIG. 5 is a diagram showing a lamp current characteristic in the lamp lighting device according to the present invention.

FIG. 6 is a diagram showing a characteristic of inrush current ratio (rush current in the initial stage of lamp lighting / lamp current in a steady state) with respect to a resistance ratio (kanthal resistance value / tungsten resistance value).

[Explanation of symbols]

1 Resistor 2 Quartz Tube 3 Resistance Material 4 Internal Lead Rod 5 Sealing Part 6 Sealing Metal Foil 7 External Lead Rod 8 Chip Tube 11 Power Supply 12, 13 Switching Element SSR (Solid State Relay) 14 Incandescent Lamp

Claims (2)

[Claims] 1. A quartz tube in which a sealing portion is formed and hermetically sealed, a resistance material which is disposed in the quartz tube and at least a part of which has kanthal or nichrome, and a resistance material of the resistance material. An internal lead rod connected to both ends and an external lead rod electrically connected to the internal lead rod at the sealing portion and led out to the outside of the quartz tube are provided, and the inside of the quartz tube is inert. A resistor characterized in that it is filled with gas or brought into a vacuum state and the resistance material is hermetically sealed inside the quartz tube. 2. A circuit for connecting a power source to the resistor and the incandescent lamp according to claim 1, which are connected in series, and a circuit for connecting the power source to the incandescent lamp are provided so as to be switchable. And a lamp lighting device.