JPH0364891A - Light emitter - Google Patents

Abstract

PURPOSE:To emit an electrodeless gas charger without exerting any adverse effect to the exterior by generating a high electric field with the high voltage of a frequency induced in the secondary coil 1 wire of a Tesla coil via a dielectric together with the resonance of a resonant circuit, and emitting an electrodeless gas charged light emitter in the electric field. CONSTITUTION:A voltage supplied to the primary coil wire 4a of a Tesla coil 4 is switched by a switching element 8, and the primary side of the Tesla coil is resonated with the switching frequency of the switching element. A high electric field is generated by the high voltage of a high frequency induced by the secondary coil wire 4b of the Tesla coil 4 via a dielectric 6 together with the resonance, and in this high electric field, an electrodeless gas charged light emitter 7 is emitted. Therefore, the electrodeless gas charged light emitter 7 can be operated without causing any noise damage to the exterior. Moreover, an electric connecting means between the light emitter 7 and an exciting means is not necessary at all because the light emitter 7 is electrodeless. thereby decreasing the cost of the light emitter 7.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a light-emitting device including a gas-filled body with an electrodeless structure that emits light using a high-frequency electric field as an excitation source.

[Conventional technology]

Luminous bodies that use electric power as an energy source and are used for lighting include incandescent bulbs and discharge lamps. Of these, discharge lamps that emit light using an electric discharge phenomenon use glass bulbs or glass bulbs filled with gas. A pair of electrodes is provided inside the tube, and when a DC or AC voltage is applied to the electrode tube, a discharge in the gas is generated to emit light.

[5@The problem that Akira is trying to solve []However,
Since the gas-filled discharge light emitters described above have electrodes sealed in a glass container, lead terminals or caps are required to connect the electrodes to an external power source, making the structure of the light emitter itself complicated. There was a problem that it became expensive and expensive. Furthermore, it has been known in the past that if a discharge tube is inserted into an electric or magnetic field with a high frequency of several tens of MHz or higher, glow discharge can be generated regardless of the presence or absence of electrodes. However, since such high-frequency discharge requires the use of an extremely high frequency of several tens of MH2, it becomes a kind of noise generation source, and has not been put to practical use in light-emitting devices such as lighting. was the current situation. This invention was made in view of the above points, and allows an electrodeless gas-filled body to emit light without adversely affecting the outside.
The purpose is to provide a light emitting device that is low cost and easy to put into practical use. [Means for Solving the Problems] A light-emitting device according to the present invention includes an air-core Tesla coil, a switching element that connects and disconnects the current supplied to the primary winding of the Tesla coil, and a switching element that connects the switching element with a signal of a predetermined frequency. a switching oscillator, a resonance capacitor that tunes the primary winding of the Tesla coil to the frequency of the oscillator as the switching element switches, and a secondary winding of the Tesla coil that tunes the primary winding to the frequency of the oscillator as the primary @ wire resonates. The device is equipped with a dielectric body for deriving an electric field to which a high-frequency high voltage induced by is applied, and an electrodeless gas-filled light emitter that emits light by the electric field from the dielectric body.

[Effect]

When the switching element is switched by a signal from the oscillator, the current flowing through the primary winding fi +C of the Tesla coil is intermittent according to the frequency of the oscillator, and the resonance frequency between the primary winding and the capacitor changes to the switching frequency of the oscillator. Attune to. Along with this, a high frequency high voltage is induced in the secondary winding of the Tesla coil according to the winding ratio of both,
When this high voltage is applied to the dielectric, the dielectric generates a high electric field toward the light emitter. As a result, light is emitted by the excitation and ionization phenomenon of gas molecules within the luminous body. Therefore, according to the present invention, an electrodeless gas-filled light emitter can be easily caused to emit light without causing external noise interference, and can be made into a low-cost light-emitting device that is easy to put into practical use.

【Example】

Embodiments of the present invention will be described below based on the drawings. FIG. 1 is a configuration diagram showing an embodiment of a light emitting device according to the present invention. In Figure 1, ■ is an AC power source such as AClooV,
is a rectifier circuit that converts the AC M source 1 into DC, and its DC output is input to the constant voltage/constant current circuit 3. Constant voltage/
The constant current circuit 3 stabilizes the DC voltage and current supplied from the rectifier circuit 2. Reference numeral 4 denotes an air-core Tesla coil, which is composed of a primary winding 4a of, for example, 10 to 15 turns, and a secondary winding 114b of, for example, 1000 to 2000 turns, and one end of the primary winding 4a is connected to the constant voltage/constant current. It is connected to the (+) output terminal of the circuit 3, and the other end is grounded via the capacitor 5. Capacitor 5 and primary coil 4a constitute a series resonant circuit. Further, one end of the secondary winding 4b of the Tesla coil 4 is connected to an M electric body 6 for deriving an electric field, and the other end is grounded. The dielectric body 6 for deriving the electric field is an electrodeless gas-filled light emitter 7
It is used to install a treadmill, and is molded from synthetic IIJ resin or the like. Further, the electrodeless gas-filled light emitter 7 is formed from a spherical or tubular glass container, and inside thereof (
Gases such as Ne, A, and N are sealed at the desired pressure. Reference numeral 8 denotes a switching element whose source and drain are connected in parallel to a capacitor 5 which is connected in series to the primary winding 4a of the Tesla coil 4. By switching this switching element 8 at a desired frequency, constant voltage and constant voltage can be achieved. A current is applied from the apposition 3 to the primary winding 4a to chop the DC voltage. This causes the primary side to resonate with the switching frequency, and a large current generated by this resonance induces a high voltage on the secondary side in accordance with the winding ratio. Reference numeral 9 denotes a switching oscillator that generates a gate signal for causing the switching element 8 to perform a switching operation, and its operating voltage is supplied from the rectifier circuit 2.
The pulse signal output from the oscillator 9 is supplied to the gate of the switching element 8 via the amplifier Mlo. 11 is the pulse signal output from the oscillator 9 and the Tesla coil 4.
This is a frequency difference detection circuit that detects the difference between the output frequency taken out from the next winding 4a, and the difference signal (m pressure) detected by this frequency difference detection circuit 11 is fed back to the oscillator 9. The frequency of the pulse signal is controlled to be automatically tuned to the resonance frequency of the primary side of the Tesla coil 4. FIG. 2 Z shows an equivalent circuit diagram of the Tesla coil 4 and the gas-filled light emitter 7. In the figure, R1 is the impedance resistance on the primary winding 1j14a side, R2 is the impedance resistance on the secondary winding 4b side, R3 is the impedance resistance of the light emitter, R4 is the impedance resistance between the device and the ground, co is the stray capacitance of the electric field deriving dielectric 6, and C1 is the primary winding ii! 4a side stray capacitance, C2 is the stray capacitance on the secondary winding 4b side, C3 is the coupling capacitance between 1 missing i4a and the secondary winding 4b, C4 is the volume stray capacitance of the light emitter, and C5 is the stray capacitance between the device and the ground. It is floating capacitance. In addition, the resistance R5 indicated by the broken line is the disturbance resistance when an object such as a human hand touches or approaches the light emitting body,
Further, the capacitor C is a disturbance capacitance when an object comes into contact with or comes close to the light emitter. Next, the operation will be explained. First, when the power switch 12 is turned on, the commercial AC power source 1 is supplied to the rectifier circuit 2. Here, the AC power is full-wave rectified, further smoothed by a smoothing means (not shown), and input to the constant voltage/constant current circuit 3. The constant voltage/constant current circuit 3 compensates for fluctuations in the f4 source and fluctuations in the load to maintain a stable constant voltage and current. On the other hand, when the DC output voltage from the rectifier circuit 2 is applied to the oscillator 9, the oscillator 9 starts oscillating and sends out a pulse signal of a predetermined frequency, for example, 150 KI (Z). After being amplified by the amplifier @io, it is supplied to the gate of the switching element 8.Therefore, when the switching element 8 is turned on/off, an intermittent current I flows through the primary @1i14a of the Tesla coil 4 due to its operation. That is, when a current I flows through the primary winding 4a when the switching element 8 is ON, energy is stored in the primary winding 4a, and the stored energy is released through the capacitor 5 when the switching element 8 is OFF. As a result, the primary side of the Tesla coil 4 undergoes free damped oscillation.The first side of the Tesla coil 4 is controlled by the frequency difference detection circuit 11 so that the input frequency applied from the oscillator 9 to the switching element 8 matches this damped oscillation frequency. The next side is tuned to the input frequency, and the current I flowing through the primary winding 4a becomes maximum.
The secondary winding 4a has both @ wires.

[A high voltage with a high frequency corresponding to ζ is induced, and by applying this high voltage with a high frequency to the dielectric 6, an electric field with a large energy level is derived from the dielectric 6 toward the ground. Therefore, when the gas-filled light emitter 7 is placed in the above electric field, an equivalent circuit as shown in FIG. 2 is constructed, so that the gas molecules in the light emitter 7 are excited and ionized. This phenomenon causes a glow discharge, which emits light in a color unique to the filled gas. At this time, since the secondary winding 1i4a of the Tesla coil 4 has sufficiently high impedance and high Q, it generates an electric field with sufficient energy to excite the light emitter 7 during series resonance. It is possible. In addition, if a hand or the like enters the electric field due to replacement of the gas-filled light emitter 7, etc., the resistance R shown by the broken line as shown in FIG.
5 and stray capacitance C6 are connected in parallel to the equivalent circuit of the light emitter 7, and the conductivity of this equivalent circuit is higher than that between the light emitter 7 and the ground through space, so the light emitter 7
The luminescence level of the object will decrease, or the luminescence will be concentrated at the point touched by the hand. At the same time, the resonance point of the Tesla coil 4 shifts significantly, and the electric field energy level decreases. At this time, since the capacitance between the device and the ground changes, the switching element 8 is controlled to flow a large amount of power, but since it is limited by the constant voltage/constant current circuit 3, the required power is As a result, the energy level of the electric field supplied from the Tesla coil 4 is extremely reduced. Therefore, even if you touch the light emitter 7 when replacing the light emitter 7 or insert your hand into the electric field, there is no risk of electric shock. In this embodiment, the voltage supplied to the primary winding of the Tesla coil 4 is switched by the switching element 8, thereby causing the primary side of the Tesla coil to resonate with the switching frequency of the switching element. A high electric field is generated through the dielectric body 6 by a high frequency high voltage induced in the secondary winding 4b of the Tesla coil 4 due to resonance, and the electrodeless gas-filled light emitter is configured to emit light using this high electric field. Therefore, the electrodeless gas-filled light emitter can emit light without causing noise interference to the outside, and since the light emitter 7 is MN-free, there is no need for electrical connection between the light emitter 7 and its excitation means. Therefore, the cost of the light emitter 7 can be significantly reduced. Furthermore, since the light emitting body 7 only needs to be in contact with or close to the dielectric body 6 for deriving the electric field, the degree of freedom in the arrangement relationship between the excitation means including the Tesla coil 4 and the light emitting body 7 is expanded, and the light emitting body can be easily replaced. In addition to becoming
Suitable for interior lighting, etc. In addition, the high-frequency electric field is generated by the resonance operation of the Tesla coil, so if an object other than the light-emitting object enters the electric field, the resonance point will shift and the voltage generated by the Tesla coil will drop dramatically. There are no problems such as electric shock when changing the body. In addition, in the above embodiment, switching oscillation! Although a case has been described in which the oscillation frequency of s9 is automatically tuned to the resonant frequency of the Tesla coil 4, the oscillator 9 is not limited to this, and the oscillator 9 may have a fixed frequency. In addition, the light emitter 7
Of course, the shape is not limited to the spherical shape shown in FIG. 1, but may also be tubular or complexly deformable. [Effects of the Invention] As explained above, according to the present invention, a resonant circuit is formed on the primary side of the Tesla coil, which is tuned to the switching frequency of the switching element that intermittents the voltage (or current) supplied to the Tesla coil. Due to the resonance of this resonant circuit, the high frequency and high voltage induced in the secondary winding of the Tesla coil generates a high electric field through the dielectric material, causing the electrodeless gas-filled light emitter in the electric field to emit light. The electrodeless gas-filled light emitter can emit light at low cost, and can be easily put to practical use as an interior lighting device, while also eliminating noise interference to the outside.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an example of a light emitting device using this oscillator, and FIG. 2 is an equivalent circuit diagram of a Tesla coil and a light emitter in this embodiment. 1. AC power supply, 2. Rectifier circuit, 3. Constant voltage/constant M? I
E@N, 4・Tesla coil, 4a...1 absent 1+l
! , 4b - Secondary winding, 5 - capacitor, 6 - dielectric for deriving electric field, 7 - gas-filled light emitter, 8 - switching element, 9 - oscillation mat for switching, 11 - frequency difference detection circuit.

Claims (1)

[Claims] an air-core Tesla coil; a switching element that connects and disconnects the current supplied to the primary winding of the Tesla coil; an oscillator that switches the switching element using a signal of a predetermined frequency; A resonance capacitor tuned to the frequency of the oscillator during switching, and a dielectric for electric field derivation to which a high frequency and high voltage induced in the secondary winding of the Tesla coil due to resonance of the primary winding is applied. and an electrodeless gas-filled light emitter that emits light by an electric field from the dielectric.