JPH04357663A - Electrodeless discharge lamp - Google Patents

Abstract

PURPOSE:To reduce a rise in the temperature of the coolest point due to generated heat from a lighting device, and prevent a drop in luminous efficacy. CONSTITUTION:In an electrodeless discharge lamp device, an induction coil 3 is wound near a light transmissible airtight vessel 1 with discharge gas sealed, and high-frequency current outputted from a lighting device laid within a device body 5 is supplied to the coil 3, thereby generating inductive magnetic field. This field is used to activate and make luminous the discharge gas. In addition, the device comprises separate circuits of a block A to generate less heat, and a block B to generate more heat. Also, the circuit block A is housed within the device body 5, and the circuit block B in a case 8 separate from the body 5. Both blocks A and B are connected to each other via a cable 9.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention does not have electrodes inside the lamp, but by applying a high frequency electromagnetic field from the outside.
The present invention relates to an electrodeless discharge lamp device that discharges discharge gas sealed inside the lamp and causes it to emit light.

0002

2. Description of the Related Art Various discharge lamps that have been put into practical use have generally had electrodes inside the lamp.

On the other hand, in recent years, so-called electrodeless discharge lamps, which are fundamentally different from these lamps, have been put into practical use. An example is shown in FIG.

In the figure, reference numeral 1 denotes a light-transmitting airtight container made of a glass bulb, and a predetermined amount of mercury vapor and rare gas are sealed inside the container. 2 is a phosphor coated on the inner surface of the bulb 1. Reference numeral 3 denotes an induction coil wound close to the outer surface of the bulb 1, and both ends thereof are connected to a high frequency power source 4.

[0005] In such an electrodeless discharge lamp, by passing a high frequency current through the induction coil 3, a high frequency magnetic field is generated around the coil 3, and the energy excites the discharge gas in the bulb 1, causing it to discharge and emit light. .

[0006] Since such electrodeless discharge lamps literally have no electrodes, they have many advantages compared to conventional electroded discharge lamps, such as long life, small size, high output, easy dimming and blinking, and freedom of shape. .

FIG. 5 shows an example of a lighting device using the electrodeless discharge lamp as described above, in which the bulb 1 is attached to the device main body 5, and the induction coil 3 is attached to the lighting device 6 disposed inside the device main body 5.
It is connected to the. In addition, valve 1 and induction coil 3
is covered with a metal mesh 7 for preventing radiation noise.

[0008]

[Problems to be Solved by the Invention] However, even with the above-mentioned electrodeless discharge lamp, when low-pressure mercury vapor is used as the discharge gas, the well-known lamp shown in FIG. Indicates temperature characteristics. This is because the coldest point temperature, which determines the mercury vapor pressure inside the bulb 1, changes depending on the ambient temperature. Therefore, it is necessary to keep the coldest point temperature optimal in the discharge lamp of the electrodeless discharge lamp device.

However, in the above-mentioned electrodeless discharge lamp device, the coldest point is located near the lighting device 6, so when the lamp is lit, the coldest point temperature increases due to self-heating due to discharge of the discharge lamp, and
It also increases due to heat generated from the lighting device 6. Therefore, it becomes difficult to maintain the coldest point temperature at an optimum value, resulting in a problem of a decrease in luminous efficiency.

The present invention has been made in view of the above-mentioned problems, and its object is to reduce the rise in the temperature of the coldest point due to heat generation from the lighting device, and to provide an electrodeless discharge lamp with less reduction in luminous efficiency. The goal is to provide equipment.

[0011]

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention provides a lighting system that includes an induction coil that circulates in close proximity to a light-transmitting airtight container filled with a discharge gas, and a lighting device that is disposed within the main body of the device. In an electrodeless discharge lamp device in which the discharge gas is discharged and emitted by an induced electromagnetic field generated by passing a high frequency current output from the device through the induction coil, the lighting device is combined with a circuit block that generates less heat and a circuit block that generates less heat. The circuit block is divided into large circuit blocks, and the circuit block that generates less heat is housed in the device body, and the circuit block that generates more heat is housed in a case separate from the device body, and they are connected by cables. do.

0012

[Function] According to the present invention, as described above, the circuit block that generates a large amount of heat in the lighting device is housed in a case separate from the main body of the device. There is no need to heat the cold spot. Therefore, the temperature at the coldest point does not rise excessively, and a decrease in luminous efficiency can be prevented.

[0013]

[Embodiment] FIGS. 1 and 2 show an embodiment of the present invention. The difference from the conventional example shown in FIG. The circuit block A, which generates less heat, is housed in the device main body 5, and the circuit block B, which generates more heat, is housed in a case 8 separated from the device main body 5, and a cable 9 is used to connect them. Since the other configurations are the same as those of the conventional example, the explanation will be omitted by assigning the same reference numerals to the equivalent configurations. In addition, in this example,
Circuit block A that generates less heat includes a matching circuit 10 , and circuit block B that generates more heat includes a power supply circuit 11 and an oscillation circuit 12 .

By separating the circuit block B, which generates a large amount of heat, from the lamp (bulb) 1, the lamp 1
The coldest point part of the lamp is no longer affected by heat generation from the lighting device, and the coldest point temperature does not rise excessively. Therefore, it is possible to prevent a decrease in luminous efficiency due to an excessive rise in the coldest spot temperature.

[0015] Furthermore, since the device main body 5 can be made smaller,
This has the effect of increasing the degree of freedom in designing the entire device and also increasing the degree of freedom in optical design.

Next, FIG. 3 shows a different embodiment of the present invention, in which a plurality of electrodeless discharge lamps can be lit at the same time. The method for separating circuit blocks A and B is the same as in the previous embodiment, but in this embodiment, circuit block B, which generates a large amount of heat, is shared by a plurality of electrodeless discharge lamps, and circuit block A, which generates a small amount of heat, is used for matching. Only the circuit is arranged for each lamp 1.

In this manner, by sharing the circuit block B that generates a large amount of heat, including the power supply circuit, in a multi-lamp arrangement, in addition to the effects of the embodiment described above, there is an effect that the entire device can be miniaturized.

[0018]

Effects of the Invention As described above, the present invention has a lighting device divided into a circuit block that generates less heat and a circuit block that generates more heat. By housing the blocks in separate cases from the device main body and connecting them with cables, the coldest point temperature of the airtight container that is the light emitting body does not rise due to heat generation from the circuit blocks, which reduces luminous efficiency. The decline can be prevented.

[Brief explanation of drawings]

FIG. 1 is a simplified diagram showing one embodiment of the invention.

FIG. 2 is a block diagram showing the lighting circuit of the above embodiment.

FIG. 3 is a simplified diagram showing different embodiments of the invention.

FIG. 4 is a simplified diagram illustrating the principle of an electrodeless discharge lamp.

FIG. 5 is a simplified diagram showing a conventional example.

FIG. 6 is a temperature characteristic diagram of a low-pressure mercury vapor discharge lamp.

[Explanation of symbols]

1 Airtight container 2. Phosphor 3 Induction coil 4 High frequency power supply 5　Device body 6. Lighting device 7 Metal mesh 8 Case 9 Cable A. Circuit block with low heat generation B. Circuit block that generates a lot of heat 10 Matching circuit 11 Power supply circuit 12 Oscillation circuit

Claims (2)

[Claims] Claim 1: By circulating an induction coil in close proximity to a light-transmitting airtight container filled with a discharge gas, and applying a high-frequency current output from a lighting device disposed within the main body of the device to the induction coil. In an electrodeless discharge lamp device that discharges the discharge gas and causes it to emit light using a generated induced electromagnetic field, the lighting device is configured to be divided into a circuit block that generates less heat and a circuit block that generates more heat. An electrodeless discharge lamp device characterized in that a circuit block is housed in the device body, a circuit block that generates a large amount of heat is housed in a case separate from the device body, and the two are connected by a cable. 2. The electrodeless discharge lamp device according to claim 1, wherein the circuit block generating less heat includes a matching circuit, and the circuit block generating more heat includes a power supply circuit and an oscillation circuit.