JP2006286584A - Magnetic coupling type fluorescent luminaire - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that the conventional method for lighting an external electrode fluorescent lamp (EEFL) has the following defects, namely, 1. although high voltage (about 1000V) and an alternating current (about 50KHz) are applied to an external electrode of a fluorescent lamp, it is difficult to take measures against electric shock while assuring convenience of attachment/detachment of the fluorescent lamp, 2. there is a step-up transformer is on a circuit board, and careless touch causes electric shock, 3. there were problems such as electric shock in using for underwater lighting. <P>SOLUTION: This magnetic coupling type fluorescent luminaire A has the following configuration. 1. A high voltage part which may cause electric shock is housed in a plastic or a glass container so that a person does not touch it. 2. The step-up transformer is divided into primary side and second side, the primary side transformer of the low voltage is housed in a power supply side connector B, and the second side transformer of high voltage is housed in a illumination side connector C. 3. Power is supplied to the fluorescent lamp through a magnetic connector 6 in the form of an alternating field. 4. For underwater lighting, a reliable screwing connector or the like sealing the container is used. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

Detailed Description of the Invention

  The present invention relates to a fluorescent lighting device incorporating a secondary transformer of a divided step-up transformer.

  When the EEFL is turned on, a high-voltage alternating current boosted by a transformer is applied to the external electrode of the fluorescent tube, but in many cases the electrode is exposed.

Problems to be solved by the invention

The conventional method of lighting EEFL has the following drawbacks. That is, 1. A high voltage (about 1000 V) and alternating current (about 50 kHz) are applied to the external electrode of the fluorescent tube.
It is difficult to take measures against electric shock by ensuring the convenience of attaching and detaching the fluorescent tube.
2. There is a step-up transformer on the circuit board.
3. There are many problems when used as underwater lighting.

Means for solving the problem

This invention is made | formed in view of this subject, Comprising: The said subject is solved with the following structures.
1. Store high-pressure parts that are at risk of electric shock in plastic or glass containers and do not give human hands an opportunity to touch them.
2. The step-up transformer is divided into a primary side and a secondary side, and a low-voltage primary-side transformer is housed in a power supply-side connector, and a high-voltage secondary-side transformer is housed in an illumination-side connector.
3. Electric power is supplied to the fluorescent lamp through a magnetic connector in the form of an alternating magnetic field.

FIG. 1 shows an example of the structure of the present invention. The present invention is divided into two types with almost the same structure. That is, there are a case where a general EEFL (external electrode fluorescent tube) is used as a light source and a case where an external electrode discharge tube (having the same structure as that of EEFL and having no fluorescent material applied to the inner wall of the tube) is used. When using EEFL, a protective or cosmetic plastic or glass outer casing is put on to complete the product. In the case of using an external electrode discharge tube, it is necessary to devise a technique for changing the emitted ultraviolet light into visible light. That is, inside the external electrode discharge tube, mercury vapor is excited by discharge to generate ultraviolet rays. This ultraviolet light excites the phosphor coated on the inner surface (2) of the plastic or glass and changes it into visible light. If plastic is used, it should be UV resistant. When arranging a plurality of EEFL or external electrode discharge tubes in parallel, it is convenient as a tube fixing method to attach the external electrodes (5) at both ends of the tube to the electrode plate (4). The electrode plates at both ends are respectively connected to the secondary transformer in the connector portion. When the secondary transformer is in close contact with and magnetically coupled to the primary transformer, it becomes a step-up transformer and can apply a necessary voltage (about 1000 V) to the EEFL or the electrode of the external electrode discharge tube.

FIG. 2 shows an example of a magnetic connector coupling structure.
The power supply side connector is a primary transformer using a ferrite core material, and the illumination side connector is also a secondary transformer using the ferrite core material. When the two are brought into close contact with each other, a step-up transformer is formed. The primary and secondary ferrites are processed so that the contact surfaces are in close contact. Each coil is protected by a filler such as plastic. In both cases, the structure is determined in consideration of the ease of attachment and detachment and the certainty of the connection. Since the structure shown in FIG. 2 is easily detached when stress is applied, it is desirable that the structure shown in FIG.

FIG. 3 shows an example of a structure that can be used for underwater lighting. That is, the outer casing is not deformed by water pressure, and is sealed so that water does not enter the pipe. The magnetic coupling uses a cylindrical ferrite core and employs a screw-type coupling system similar to incandescent lamps. There have been no reports of fatal accidents due to electric shock due to high-frequency power transmission of about 50 kHz, but burns associated with high heat generation are possible. In the present invention, the risk of burns is eliminated by suppressing the voltage to about 12V. Incidentally, if the human resistance value R is 500Ω, the generated power is only 0.3 W from W = V ² / R.

The external electrode discharge tube is made of quartz glass in consideration of the transmittance of ultraviolet rays (254 nm). FIG. 4 shows spectral transmittance curves of the general glass tube (a) and the quartz glass tube (b). Since the main wavelength of the phosphor-excited ultraviolet light emitted from the mercury-containing discharge tube is 254 nm, it can be seen that the general glass tube a hardly transmits this wavelength and the quartz glass tube b transmits well.

The invention's effect

The present invention produces the following effects.
1. Since the high-pressure part is stored in the container, there is no opportunity for electric shock.
2. The use of low-voltage power transmission and magnetic connectors and air-tight plastic or glass containers will pave the way for underwater lighting.
3. In particular, the lamp having the structure shown in FIG.
4). Care should be taken because the EEFL or external electrode discharge tube is thin and fragile, but a plastic or glass container helps protect it.
5. As a lighting fixture, the degree of freedom in shape is great.
6). When applying the phosphor to the inner casing of the outer casing, it opens the way for collecting the phosphor.

Structural diagram of magnetically coupled lighting device The figure which shows an example of the structure of a magnetic connector Structure diagram of hermetically sealed / screwed magnetically coupled lighting system Spectral transmittance curve of general glass tube and quartz glass tube

Explanation of symbols

A. Magnetic coupling type lighting apparatus B. Power supply side connector C.I. 1. Lighting side connector Outer casing 2. 2. Inner casing inner surface 3. External electrode discharge tube 4. Electrode plate External electrode 6. 6. Magnetic connector Wiring 8. Ferrite core9. Hook 10. Metal spring 11. Primary coil 12. Secondary coil 13. Filler 14. Plastic housing 15. Screw 16. Plastic screw a. General glass tube b. Quartz glass tube

Claims (6)

  An integrated fluorescent lighting device that uses an arbitrary number of external electrode fluorescent tubes (External Electrode Fluorescent Lamp, hereinafter referred to as EEFL), is connected to a secondary coil of a split transformer, and is placed in a plastic or glass container.   Use any number of external electrode discharge tubes (with the same structure as EEFL, using quartz glass and not coated with phosphor), connected to the secondary coil of the split transformer, and plastic or phosphor coated inside Integrated fluorescent lighting device in a glass container.   2. A step-up transformer using ferrite as a core material, wherein a split transformer is formed by separating a primary side and a secondary side, and a transformer built-in connector that feeds and boosts power by exposing and closely contacting a core portion is used. And the fluorescent lighting device of claim 2.   The fluorescent lighting device according to claim 1 or 2, wherein a secondary side split transformer built-in connector is provided on an outer plastic or glass container end or back surface.   3. The fluorescent lighting device according to claim 1, wherein an opening / closing mechanism is provided in an outer plastic or glass container to facilitate maintenance.   3. The fluorescent lighting device according to claim 1 or 2, wherein an outer plastic or glass container has an airtight structure and can be used in water.

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