JPS6321845Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Purpose of the Invention] (Field of Industrial Application) The present invention relates to a fluorescent lamp device that is compatible with incandescent light bulbs and can be used by being directly inserted into an existing incandescent light bulb socket.

(Prior Art) As a fluorescent lamp device of this kind, a light bulb-shaped envelope consisting of a cover with a base and a globe fitted on the cover is provided with a light bulb shaped like a saddle. It is known that an arc tube and a lighting circuit for starting and lighting the arc tube are integrally housed.

By the way, in the past, the above-mentioned lighting circuit generally used a chiyoke ballast type ballast, but recently, in order to reduce the size and weight of the lighting circuit and improve the luminous efficiency, the above-mentioned ballast has been used. Attempts have been made to use high-frequency lighting circuits instead of lamps.

However, this high-frequency lighting circuit generates high-frequency noise from the transformers and current limiting chokes that make up the high-frequency conversion circuit, so this high-frequency noise leaks outside the envelope and causes problems such as communication failure. arise.

To explain in more detail, the high-frequency noise generated by high-frequency lighting circuits is divided into two types: line-propagated noise, which is transmitted through the power supply circuit to other electrical equipment as electrical noise, and line-propagated noise, which is emitted from the high-frequency lighting circuit into the air. There is also radiation noise.

As a measure to prevent disturbances caused by line propagation noise, a line noise filter circuit can be incorporated into the high frequency lighting circuit to absorb the noise and reduce the noise to a level that does not pose a practical problem.

On the other hand, as a measure to prevent disturbances caused by radiated noise, there is generally known a method of surrounding and shielding a high frequency noise source with a conductor and connecting the conductor to ground.

(Problems to be Solved by the Invention) However, in the above-mentioned fluorescent lamp device, although it is not impossible to shield the source of high frequency noise, it is not possible to connect the shield to earth.

In the case of only a shield, although it has the effect of deflecting the direction of noise radiation, the effect of reducing the absolute value of noise is extremely small.

Therefore, in the fluorescent lamp device using a high-frequency lighting circuit, it is a problem to reduce the radiation noise emitted into the air.

The present invention was developed based on these circumstances, and aims to provide a fluorescent lamp device that can reduce radiation noise and minimize adverse effects on surrounding equipment such as communication failure. .

[Structure of the invention] (Means for solving the problems) The present invention is characterized in that a conductive member facing the high frequency lighting circuit is directly attached to the arc tube.

(Function) According to the present invention, the radiation noise emitted from the high-frequency lighting circuit is captured by the conductive member that faces the high-frequency lighting circuit. Since this conductive member is in direct contact with the arc tube, this conductive member is connected to the lighting circuit via the arc tube in terms of stray capacitance, and therefore the conductive member emits radiation. When noise is captured, this noise is returned to the lighting circuit, so radiation noise can be reduced.

(Example) The present invention will be described below based on an example shown in the drawings.

In the figure, reference numeral 1 denotes a cover made of synthetic resin, which is formed into a bowl shape with a circumferential surface forming a paraboloid of revolution. A base 2 such as an E26 type is attached to the top of one end of the cover 1, and a synthetic resin glove 3 having translucent properties is fitted into the opening at the other end.
The globe 3 has a substantially spherical shape, and the globe 3 is fitted to form an envelope 4 in the shape of a ball light bulb. A curved arc tube 5 is housed within the envelope 4. The arc tube 5 has electrodes 6 at both ends.
A straight glass bulb sealed with a straight tube is bent into a substantially U-shape at the center of both ends 7, 7 to form a first bent part 8, and this first bent part 8 and both ends 7 , 7, a pair of second curved portions 9, 9 each curved into a substantially U-shape in a direction perpendicular to a plane including the U-shape, and between the both end portions 7, 7 and the first The curved portions 8 are located adjacent to each other in the same direction, and the overall shape resembles a saddle for horseback riding, so it is called a saddle-shaped arc tube. A predetermined amount of mercury and an inert gas are sealed inside the arc tube 5, and a phosphor coating 10 is coated on the inner surface. Such an arc tube 5 is supported with both end portions 7, 7 and the first curved portion 8 facing the cover 1 side, and although this support structure is not shown in detail, in the case of this embodiment. are both ends 7,
7 and the first curved portion 8 are supported by being engaged with a pair of opposing support walls 11, 11 led out from the cover 1 side.

On the other hand, a high frequency lighting circuit 12 for lighting the arc tube 5 is housed in the same space within the envelope 4. As shown in the block diagram in FIG. 3, this high-frequency lighting circuit 12 mainly includes a line noise filter circuit 13, a full-wave rectifier circuit 14, a power supply smoothing capacitor 15, and a high-frequency conversion circuit 16. Line noise filter circuit 13 for absorbing line propagation noise from AC cycles
is input to the full-wave rectifier circuit 14 through
The full-wave rectifier circuit 14 converts the voltage into a direct current and outputs it, and the high-frequency conversion circuit 16 converts the output voltage into a high-frequency voltage and outputs the voltage. Such a high frequency lighting circuit 12 includes not only the cap 2 but also the base 2.
Various circuit elements 19 such as transistors and oscillation transformers, which are connected to the arc tube 5 through a current limiting transformer 18 and constitute the lighting circuit 12, are arranged in parallel on the surface of the circuit board 20. The circuit board 20 is mounted on the support walls 11 and 1 with the side on which the circuit elements 19 are arranged in parallel facing the cover 1 side.
Therefore, the high frequency lighting circuit 12 is located exactly within the cover 1. In addition,
Reference numeral 21 denotes a starting circuit for the arc tube 5, which is arranged on the surface of the circuit board 20 together with the high frequency lighting circuit 12.

By the way, the arc tube 5 inside the envelope 4 is
The curved parts 9, 9 are opposed to each other in close proximity to the inner surface of the top part of the globe 3, and a support member 22 made of, for example, metal is interposed as a conductive member between these opposed parts. The support member 22 faces the circuit board 20 in a plane, and has a pair of holes at both ends that abut and sandwich the curved outer tube wall portions of the second curved portions 9, 9. Clamping parts 23, 23 are formed, and a flat part 24 connecting these clamping parts 23, 23 is provided with a protrusion that is fitted into an opening 25 formed at the top of the glove 3.

In this embodiment, as a preferable example, an inner cover 26 made of aluminum is fitted inside the cover 1, and the periphery of the high frequency lighting circuit 12 is covered with a conductive layer.

According to such a configuration, even if high frequency noise is generated from the transformer of the high frequency lighting circuit 12, the current limiting transformer 18, etc. during lighting, it can be reduced in the following manner.

That is, the line propagation noise generated in the high-frequency lighting circuit 12 is absorbed by the line noise filter circuit 13 built into the high-frequency lighting circuit 12, so that the adverse effect on surrounding electrical equipment is reduced.

Furthermore, when the radiation noise emitted from the high-frequency lighting circuit 12 attempts to head toward the cover 1, that is, upward, the inner cover 26 provided on the inner surface of the cover 1 shields it and deflects it downward. and deflect it downward and the high frequency lighting circuit 12
The radiated noise directly emitted downward from
The light is captured by a conductive support member 22 facing the high-frequency lighting circuit 12 .

This support member 22 has clamping portions 2 at both ends.
3, 23 directly to the arc tube 5, it is connected to the lighting circuit via the arc tube 5 in terms of stray capacitance, and therefore the radiation noise captured by this support member 22 is Returned to lighting circuit. In the lighting circuit, a noise current flows due to this radiated noise, and this noise current tends to flow to the power supply side in the same way as the line propagation noise described above, so this noise current is absorbed by the line noise filter circuit 13.

In other words, the radiation noise is changed into line propagation noise and absorbed by the line noise filter circuit 13, so that the radiation noise can also be reduced.

According to the configuration of this embodiment, since the protrusion of the conductive support member 22 is fitted into the opening 3 of the globe 3, the arc tube 5 is placed not only on the cover 1 side but also on the top side of the globe 3 by the support member 22. However, the arc tube 5 can be stably supported regardless of the lighting direction, and its impact resistance is improved.

Furthermore, the heat of the arc tube 5 while the lamp is lit is transmitted to the globe 3 side through the support member 22 and radiated outward via the globe 3, so that the heat dissipation effect of the arc tube 5 is improved and the outer The rise in temperature of the container 4 can be suppressed. Therefore, a decrease in luminous efficiency can be prevented, and the influence of heat on the high frequency lighting circuit 12 is also reduced.

In the above-described embodiment, the arc tube has a saddle shape, but it may be U-shaped, for example, and the shape of the envelope is not limited to the ball bulb shape.

Further, the line noise filter circuit 13 may be provided outside the envelope 4. Furthermore, the radiation noise is captured by the support member 22 and returned to the lighting circuit, but this returned noise is not necessarily absorbed by the line noise filter circuit 13.
In short, it is sufficient to capture radiation noise with the support member 22 and return it to the lighting circuit, and is not limited to the provision of the line noise filter circuit 13.

Further, the conductive member is not limited to being made only of metal materials, and may be made of, for example, a synthetic resin material coated with metal.

(Effects of the invention) According to the invention detailed above, the conductive member attached to the arc tube captures radiation noise and returns it to the lighting circuit, reducing radiation noise generated from the high-frequency lighting circuit during line lighting. Therefore, there is an advantage that adverse effects on peripheral equipment, such as communication failure, are reduced.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a sectional view, FIG. 2 is a sectional view taken along the line - - in FIG. 1, and FIG. 3 is a block diagram of a high frequency lighting circuit. DESCRIPTION OF SYMBOLS 1... Cover, 2... Base, 3... Globe, 5... Arc tube, 6... Electrode, 8, 9... Bending part (first bending part,
12... High frequency lighting circuit, 13... Line noise filter circuit, 22... Conductive member (supporting member).

Claims (1)

[Scope of utility model registration request] Approximately
In a fluorescent lamp device that houses a curved arc tube having a letter-shaped bent portion and a high frequency lighting circuit for lighting the arc tube, a conductive member is provided in the arc tube and faces the high frequency lighting circuit. A fluorescent lamp device characterized in that it is directly attached.