JPH08161925A - Fluorescent lighting equipment - Google Patents

Abstract

PURPOSE: To provide a fluorescent luminaire in which feedback noise to a power source can be reduced surely with a simple structure against the noise generated in a fluorescent lamp and a fluorescent lamp stabilizer circuit. CONSTITUTION: A fluorescent luminaire is provided with a fluorescent lamp 13, a stabilizer circuit 16 lighting the fluorescent lamp 13, a luminaire main body 10 containing the stabilizer circuit 16, and a conductive center cover 11 arranged in the vicinity of a fluorescent lamp 13 and connected to a luminaire main body 10 electrically. The stabilizer circuit 16 is fitted on the fluorescent lamp 13 side surface of the luminaire main body 10 via a dielectric base material 15 composed of a dielectric sheet.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent lamp luminaire with reduced electromagnetic noise, and more particularly, to a power supply by forming a stray capacitance between a fluorescent lamp and a housing and between a ballast circuit and a housing. The present invention relates to a fluorescent lamp lighting fixture with reduced electromagnetic noise returned to the.

[0002]

2. Description of the Related Art As a conventional fluorescent lamp lighting fixture, there is an invention disclosed in, for example, Japanese Patent Laid-Open No. 6-53621. According to the present invention, an insulating layer is provided on a metal plate, and a printed board having a printed pattern is provided on the insulating layer to reduce noise radiated into space. It does not reduce noise.

In the invention disclosed in Japanese Patent Laid-Open No. 61-57337, an insulating layer is provided on a metal plate, and a printed board having a print pattern is provided on the insulating layer, but electromagnetic noise is reduced. Is not intended.

FIG. 22 is a perspective view showing an example of a conventional single-base fluorescent lamp lighting device disclosed in Japanese Patent Laid-Open No. 4-33206, in which power source feedback noise is reduced. According to the present invention, a plurality of fluorescent lamp sockets 2 and 2 are provided on one side of an instrument body 1 in the shape of a square tray, and a lamp insertion hole 3 thereof is provided.
Lighting devices 4 such as a ballast or a high frequency lighting device are arranged in proximity to the fluorescent lamp sockets 2 and 2. The fluorescent lamp sockets 2 and 2 are provided with connecting portions 5 and 5 for connecting the wiring on the secondary side of the lighting device 4, and the lighting device 4 is provided with a connecting portion 6 for connecting the wiring on the secondary side. There is. The connecting portions 5 and 5 of the fluorescent lamp sockets 2 and 2 and the connecting portion 6 on the secondary side of the lighting device 4 are connected via a T-shaped wiring block 8 having a connecting terminal 7. There is.

According to the single-ended fluorescent lamp illuminator as described above, the wiring block 8 having a T-shaped plate shortens the wiring from the lighting device 4 to the fluorescent lamp sockets 2, 2 and keeps it constant. It is said that noise generated from the secondary side of the lighting device 4 and interference on the primary side are suppressed to reduce power supply feedback noise.

[0006]

SUMMARY OF THE INVENTION A single-base fluorescent lamp lighting device having the above-described structure (Japanese Patent Laid-Open No. 4-33206).
According to this, the structure of the wiring becomes complicated, and the wiring space becomes large especially when it is used for a straight tube fluorescent lamp lighting fixture. Further, since the lighting device 4 and the wiring connection portion of the fluorescent lamp socket 2 have a special structure, the cost is increased. Furthermore, while it is possible to prevent power supply feedback noise from occurring due to interference between the primary side and the secondary side, measures are taken to prevent noise that returns directly from the noise source such as a fluorescent lamp to the power source through the electric wire. Not not.

On the other hand, by placing a conductor electrically connected to the casing in the vicinity of the fluorescent lamp, stray capacitance is generated between the fluorescent lamp and the conductor, and through this, common mode noise is generated. By forming a return loop, there is a device which reduces the feedback noise to the power supply with a simple structure at low cost. However, in such a configuration, when the stray capacitance between the fluorescent lamp ballast circuit and the housing is small, a sufficient return loop cannot be performed, and therefore common mode noise may return to the power supply. Also,
Since a stray capacitance between the input / output line and the housing seen from the fluorescent ballast circuit cannot be expected, if a large stray capacitance is formed between the fluorescent lamp and the conductor, a common mode capacitor must be inserted on the power supply side to return loop. May not be formed, and conversely the power supply feedback noise may increase.

The present invention has been made in order to solve the above-mentioned problems, and a return loop is reliably formed with a simple structure for a noise generated in a fluorescent lamp and a ballast circuit by a reliable structure. An object of the present invention is to obtain a fluorescent lamp luminaire that can reduce noise.

[0009]

A fluorescent lamp lighting fixture according to the present invention is configured as follows. (1) A fluorescent lamp, a ballast circuit for lighting the fluorescent lamp, a conductive instrument body that houses the ballast circuit, and a conductive element that is disposed near the fluorescent lamp and is electrically connected to the instrument body. And a center circuit, and the ballast circuit is attached to the surface of the instrument body on the fluorescent lamp side via a dielectric substrate made of a dielectric sheet.

(2) A fluorescent lamp, a ballast circuit for turning on the fluorescent lamp, a conductive instrument body for housing the ballast circuit, and a fluorescent lamp which is disposed close to the fluorescent lamp and electrically connected to the instrument body. And a conductive center cover, and the ballast circuit is mounted on the surface of the center cover opposite to the fluorescent lamp via a dielectric substrate made of a dielectric sheet.

(3) In the fluorescent lamp illuminator of the above (2), the surface of the center cover facing the fluorescent lamp is formed to have substantially the same shape as the outer peripheral surface of the fluorescent lamp.

(4) In the fluorescent lamp luminaire according to the above (1) and (2), output conductors for connecting the ballast circuit and the fluorescent lamp are embedded on both sides of the dielectric base material.

(5) In the fluorescent lamp lighting fixture according to the above (1) and (2), an input conductor for connecting a power source and a ballast circuit is embedded on both sides of a dielectric base material.

(6) In the fluorescent lamp lighting fixture according to the above (1) and (2), an output conductor for connecting the ballast circuit and the fluorescent lamp is provided on one side of the dielectric substrate with a predetermined gap in the vertical direction. It is buried.

(7) In the fluorescent lamp lighting fixture of the above (1) and (2), an input conductor for connecting a power source and a ballast circuit is embedded in one side of a dielectric base material with a predetermined gap in the vertical direction. It was done.

(8) In the fluorescent lamp lighting device according to the above (1) and (2), a magnetic base material is provided on one side of a dielectric base material, and a ballast circuit and a fluorescent lamp are provided in the magnetic base material. Is provided with an output conductor for connecting to.

(9) In the fluorescent lamp lighting fixture of (1) and (2) above, a magnetic base material is provided on one side of the dielectric base material, and a power source and a ballast circuit are connected to the magnetic base material. The input conductor is provided.

(10) In the fluorescent lamp lighting fixture according to the above (1) and (2), a magnetic base material is provided on a part of both sides of the dielectric base material, and the dielectric material is vertically provided on both sides of the dielectric base material. An input conductor that connects between the power supply and the ballast circuit is provided in the body base material and the magnetic base material, and an output conductor that connects the ballast circuit and the fluorescent lamp is embedded in the dielectric base material. It was done.

[0019]

The operation of the present invention will be described with the numbers corresponding to the numbers of the means for solving the above problems. (1) Stray capacitance is reliably generated between the fluorescent lamp and the casing and between the ballast circuit and the casing, and a return loop of common mode noise is formed by these stray capacitances, and common mode noise does not return to the power supply. Power supply feedback noise is reduced. (2) The impedance of the noise return loop is lowered, the noise flowing into the return loop is increased, and the power supply feedback noise is reduced.

(3) The facing area becomes large, and the stray capacitance between the fluorescent lamp and the case becomes large. (4) Stray capacitance is generated between the output conductor and the case, and a new noise return loop is formed. (5) Stray capacitance is generated between the input conductor and the case, and a noise return loop is newly formed.

(6) Stray capacitance is generated between the output conductors,
A noise return loop is formed even in the normal mode. (7) Stray capacitance is generated between the input conductors, and a noise return loop is formed even in the normal mode.

(8) An inductive component and a resistive component are generated in the output conductor, and noise due to resistance loss is absorbed with respect to common mode noise. (9) An induction component and a resistance component are generated in the output conductor, and noise due to resistance loss is absorbed with respect to common mode noise. (10) A return loop of noise generated in the ballast circuit is newly formed.

[0023]

【Example】

Embodiment 1 FIG. 1 is an exploded perspective view of a first embodiment of the present invention, and FIG.
FIG. 2 is a vertical cross-sectional view showing an example of a straight tube single-lamp type fluorescent lamp lighting fixture. 10 is a device main body made of a conductive metal material having a U-shaped cross section, which is mounted on the ceiling by accommodating a ballast circuit etc. (described later) inside, and 11 is along the longitudinal direction. A groove 11a is formed, and is a center cover made of a conductive metal material that fits into the instrument body 10 and acts as a lid, and is electrically connected to the instrument body 10.
The instrument body 12 and the center cover 11 form an instrument housing 12.

Reference numeral 13 is a fluorescent lamp (fluorescent tube) mounted along the groove 11a of the center cover 11 and close to the center cover 11, and 14 and 14 are mounted on both ends of the instrument housing 12 and are fluorescent lamps. 13 is a fluorescent lamp socket for fixing both ends of 13. Reference numeral 15 denotes a dielectric base material attached for insulation on the inner side surface (on the surface on the fluorescent lamp 13 side) of the main body flat portion 10a of the instrument main body 10 and is made of a thin dielectric sheet. Reference numeral 16 denotes a ballast circuit of a fluorescent lamp for lighting the fluorescent lamp 13 mounted on the dielectric base material 15, which is composed of a print pattern (described later), electric parts and the like.

FIG. 3 is a circuit diagram conceptually showing the operation of the first embodiment. Reference numeral 17 is a noise filter provided on the input side of the ballast circuit 16, and 18 is a common mode capacitor existing in the noise filter 17. 19a is a stray capacitance generated between the fluorescent lamp (fluorescent tube) 13 and the center cover 11, and 19b is a stray capacitance generated between the instrument body 10 and the ballast circuit 16. Reference numeral 20 is a return loop of common mode noise formed between the center cover 11 and the instrument body 10, and 21 is formed between the center cover 11 and the instrument body 10 when the noise filter 17 has the common mode capacitor 18. It is a return loop.

The operation of the first embodiment constructed as described above will be described. When the fluorescent lamp lighting device is turned on, the center cover 11 is present close to the fluorescent lamp 13,
In the meantime, the stray capacitance 19a is generated. Further, since the ballast circuit 16 is provided on the instrument body 10 with the thin dielectric substrate 15 sandwiched between them, the stray capacitance 19b is also generated during this period. Since the center cover 11 and the instrument body 10 are electrically connected, a return loop 20 for common mode noise is formed between them. Further, when the noise filter 17 includes the common mode capacitor 18, the return loop 21 is similarly formed. Therefore, stray capacitances 19a and 19b are reliably generated between the fluorescent lamp 13 and the center cover 11 and between the ballast circuit 16 and the fixture body 10, respectively, and these stray capacitances 19 are generated.
Since the common mode noise return loops 20 and 21 are formed by a and 19b, the common mode noise does not return to the power source, and the power source feedback noise is reduced.

Embodiment 2 FIG. 4 is an exploded perspective view of a second embodiment of the present invention, and FIG. 5 is FIG.
FIG. The same or corresponding parts as those in FIGS. 1 and 2 are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the ballast circuit 16 is provided on the inner side surface of the cover flat surface portion 11a of the center cover 11 (on the surface opposite to the fluorescent lamp 13).
It is attached via the dielectric substrate 15.

The basic operation of noise reduction of the second embodiment constructed as described above is the same as that of the first embodiment. However, since the ballast circuit 16 is provided in the center cover 11, the noise return loop is shortened, the impedance of the return loop is reduced, and the ratio of the noise flowing into the noise return loop is increased. growing. Further, since the ballast circuit 16 is attached to the center cover 11, it is possible to provide a screw hole when the instrument body 10 is installed on the ceiling or the like at an arbitrary position, and the instrument body 10 is also lightened to improve the efficiency of installation work. Can be achieved.

Embodiment 3 FIG. 6 is an exploded perspective view of a third embodiment of the present invention, and FIG. 7 is FIG.
FIG. This embodiment is similar to the second embodiment in that the ballast circuit 16 is mounted on the inner surface of the center cover 11 via the dielectric base material 15, but the surface of the center cover 11 facing the fluorescent lamp 13 is the same. Has a shape corresponding to the outer peripheral surface of the fluorescent lamp 13. That is, the fluorescent lamp 1
The center cover 11 is formed into a semi-cylindrical concave surface in conformity with the cylindrical surface of No. 3.

The basic operation of noise reduction of the third embodiment configured as described above is the same as that of the first embodiment. However, since the shape of the center cover 11 corresponds to the outer peripheral surface of the fluorescent lamp 13, the area corresponding to the fluorescent lamp 13 becomes large and the stray capacitance also becomes large, so that the noise reduction effect becomes large.

Embodiment 4 FIG. 8 is a vertical sectional view showing the main part of the fourth embodiment of the present invention. Reference numeral 15 is a dielectric base material, and high step portions 15a, 15 are provided on both sides.
It has a substantially concave cross section having a. Reference numeral 22 is a print pattern provided in the recess 15b near the center of the dielectric substrate 15. Output conductors 23 and 23 connect the ballast circuit 16 and the fluorescent lamp 13 and are embedded in the high step portions 15a and 15a of the dielectric substrate 15. Then, each of the output conductors 23, 23 is embedded in a horizontal row in each of the high step portions 15a, 15a with a constant gap 24, 24 as a pair. The mounting position of the ballast circuit 16 to be mounted via the dielectric base material 15 is as follows.
It may be on either surface of (Example 1) or the center cover 11 (Example 2).

FIG. 9 is a circuit diagram conceptually showing the operation of this embodiment. The line connecting the ballast circuit 16 and the fluorescent lamp 13 corresponds to the output conductor 23. 19c is the output conductor 2
3 and instrument housing 12 (apparatus body 10 or center cover 1
The stray capacitance generated between 1) and 20 is a noise return loop formed by this embodiment.

The basic operation of noise reduction of this embodiment constructed as described above is the same as that of the first embodiment. However, since the output conductor 23 is embedded in the dielectric base material 15, as shown in FIG. 9, a stray capacitance 19c is generated between the output conductor 23 and the instrument housing 12, and a new noise return loop is generated. Since 20 is formed, the effect of reducing the feedback noise to the power supply is increased.

Embodiment 5 FIG. 10 is a vertical cross-sectional view showing the main part of the fifth embodiment of the present invention. Reference numeral 15 is a dielectric base material, which has high step portions 15a, 1 on both sides.
5a has a substantially concave cross section. Reference numeral 22 is a print pattern provided in the recess 15b near the center of the dielectric substrate 15. Input conductors 25 and 25 connect the power source and the ballast circuit 16, and each high step portion 1 of the dielectric substrate 15
It is embedded in 5a and 15a. In addition, the mounting position of the ballast circuit 16 mounted via the dielectric base material 15 is
It may be on any surface of the instrument body 10 (Example 1) or the center cover 11 (Example 2).

FIG. 11 is a circuit diagram conceptually showing the operation of this embodiment. The line connecting the power source and the ballast circuit 16 corresponds to the input conductor 25. In addition, 19c is a stray capacitance generated between the input conductor 25 and the instrument housing 12 (the instrument body 10 or the center cover 11), and 20 is a noise return loop formed by this embodiment.

The basic operation of noise reduction of the present embodiment configured as described above is the same as that of the first embodiment. However, in the dielectric substrate 15, the input conductor 25,
Since 25 is embedded, as shown in FIG.
The stray capacitance 19c is generated between the device 5 and the instrument housing 12, and a new noise return loop 20 is formed, so that the effect of reducing feedback noise to the power source is increased.

Embodiment 6 FIG. 12 is a vertical sectional view showing the main part of the sixth embodiment of the present invention. Reference numeral 15 is a dielectric base material, which has a substantially stepped portion 15a on one side and has a substantially L-shaped cross section. 22 is the dielectric substrate 1
5 is a print pattern provided on the low step portion 15c. Reference numerals 23 and 23 denote output conductors that connect the ballast circuit 16 and the fluorescent lamp 13 to each other.
The output conductors 23, 23 are embedded in a horizontal gap in a row with a constant gap 24b therebetween so as to overlap with each other in the vertical direction. . The ballast circuit 16 may be attached via the dielectric substrate 15 on any surface of the instrument body 10 (Example 1) or the center cover 11 (Example 2).

FIG. 13 is a circuit diagram conceptually showing the operation of this embodiment. The line connecting the ballast circuit 16 and the fluorescent lamp 13 corresponds to the output conductor 23. 26 is an output conductor 23, 2
A stray capacitance 27, 27 generated between the three is a noise return loop newly formed with respect to the normal mode noise.

The basic operation of noise reduction of the sixth embodiment configured as described above is the same as that of the first embodiment. However, in the dielectric substrate 15, the output conductors 23, 2
As shown in FIG. 13, the output conductor 2
A stray capacitance 26 is generated between No. 3 and No. 23, and a new noise return loop 27, 27 is added to the normal mode noise.
As a result, the effect of reducing the feedback noise to the power supply is increased even with respect to the normal mode noise.

Embodiment 7 FIG. 14 is a vertical sectional view showing the main part of the seventh embodiment of the present invention. Reference numeral 15 is a dielectric base material, which has a substantially stepped portion 15a on one side and has a substantially L-shaped cross section. 22 is a derivative base material 1
5 is a print pattern provided on the low step portion 15c. Input conductors 25 and 25 connect the power source and the ballast circuit 16, and are embedded in the high step portion 15a of the dielectric base material 15 so as to be vertically overlapped with a certain gap 24b. The ballast circuit 16 may be attached via the dielectric substrate 15 on any surface of the instrument body 10 (Example 1) or the center cover 11 (Example 2).

FIG. 15 is a circuit diagram conceptually showing the operation of this embodiment. The line connecting the power source and the ballast circuit 16 corresponds to the input conductor 25. Reference numeral 26 is a stray capacitance generated between the input conductors 25, 25 is a return loop of noise newly formed with respect to normal mode noise.

The basic operation of noise reduction of the present embodiment configured as described above is the same as that of the first embodiment. However, in the dielectric substrate 15, the input conductors 25, 25
Embedded in the input conductor 25, as shown in FIG.
Since the stray capacitance 26 is generated between 25 and a new noise return loop 27 is formed for normal mode noise, the effect of reducing the feedback noise to the power supply not only for common mode noise but also for normal mode noise Is obtained.

Embodiment 8 FIG. 16 is a vertical sectional view of an eighth embodiment of the present invention. 15
Is a dielectric substrate having a substantially L-shaped cross section having a high step portion 15a on one side. Reference numeral 28 denotes a magnetic base material that constitutes a part or the whole of the high step portion 15a of the dielectric base material 15. Reference numeral 22 is a print pattern provided on the low step portion 15c of the dielectric substrate 15. 23 and 23 are ballast circuits 1
6 is an output conductor for connecting the fluorescent lamp 13 and the fluorescent lamp 13, and is sandwiched in the magnetic base material 28 of the dielectric base material 15 so as to be vertically overlapped with a certain gap 24b therebetween. Each of the conductors 23, 23 is provided in a horizontal row with a pair of two conductors at a constant interval 24a.
The dielectric base material 15 and the ballast circuit 16 mounted via the dielectric base material 15 may be mounted on any surface of the instrument body 10 (Example 1) or the center cover 11 (Example 2).

FIG. 17 is a circuit diagram conceptually showing the operation of this embodiment. The upper line connecting the ballast circuit 16 and the fluorescent lamp 13 corresponds to the output conductor 23. Reference numerals 29 and 30 denote an induction component and a resistance component formed on the output conductor 23.

The basic operation of noise reduction of the present embodiment configured as described above is the same as that of the first embodiment. However, the output conductor 2 is not formed in the magnetic base material 28.
3 and 23 are provided, as shown in FIG.
An inductive component 29 and a resistive component 30 are formed in 3 to suppress the noise leaking to the power source due to the noise absorption effect due to the resistance loss with respect to the common mode noise.

Embodiment 9 FIG. 18 is a vertical sectional view of an eighth embodiment of the present invention. 15
Is a dielectric substrate having a substantially L-shaped cross section having a high step portion 15a on one side. Reference numeral 28 denotes a magnetic base material that constitutes a part or the whole of the high step portion 15a of the dielectric base material 15. Reference numeral 22 is a print pattern provided on the low step portion 15c of the dielectric substrate 15. 25 is a power supply and ballast circuit 1
Input conductors for connecting with 6 are provided laterally in the magnetic base material 28 of the dielectric base material 15 at regular intervals 24a. The mounting position of the dielectric base material 15 and the ballast circuit 16 mounted via the dielectric base material 15 is as follows.
It may be on either surface of (Example 1) or the center cover 11 (Example 2).

FIG. 19 is a circuit diagram conceptually showing the operation of this embodiment. The upper line connecting the power source and the ballast circuit 16 corresponds to the input conductor 25. Reference numerals 29 and 30 are inductive components and resistance components formed in the input conductor 25.

The basic operation of noise reduction of the present embodiment configured as described above is similar to that of the first embodiment. However, the input conductor 25 is not formed in the magnetic base material 28.
By providing the input conductor 25, as shown in FIG.
An inductive component 29 and a resistance component 30 are formed on the surface, and the noise leaking to the power supply is suppressed by the noise absorption effect due to resistance loss with respect to common mode noise.

Embodiment 10 FIG. 20 is a perspective view showing a see-through state of a tenth embodiment of the present invention. 15 is a dielectric base material, and high step portions 15 are provided on both sides.
It has a concave cross section having a and 15a. 28, 28
Is a base material of a magnetic material that constitutes a part of the high step portions 15a of the dielectric base material 15, and 22 is a print pattern provided in the concave portion 15b near the center of the dielectric base material 15.

Reference numerals 25 and 25 are input conductors that connect the power source and the ballast circuit 16, and 23 and 23 are output conductors that connect the ballast circuit 16 and the fluorescent lamp 13, respectively, to the high step portions 15a,
An input conductor 25 and an output conductor 23 are provided in 15a so as to be vertically overlapped with each other at a predetermined interval. Further, the output conductors 23, 23 provided in the high step portions 15a, 15a are arranged in a horizontal row at a constant interval with each pair of two. And
The output conductors 23, 23 are embedded only in the portion of the dielectric base material 15 forming the high step portion 15a, and the input conductors 25, 25 are the magnetic base material 28 and the dielectric base material 15 forming the high step portion 15a. It is crotch on both parts. The dielectric base material 15 and the ballast circuit 16 mounted via the dielectric base material 15 may be mounted on any surface of the instrument body 10 (Example 1) or the center cover 11 (Example 2).

FIG. 21 is a circuit diagram conceptually showing the operation of this embodiment. The upper line connecting the power source and the ballast circuit 16 is the input conductor 25 and the line connecting the ballast circuit 16 and the fluorescent lamp 13 is. The output conductor 23.

The basic operation of noise reduction of the present embodiment constructed as described above is the same as that of the first embodiment. However, when the input conductor 25 and the output conductor 23 are embedded in the dielectric base material 15 so as to be overlapped with each other, stray capacitance 19 is generated between the input conductor 25 and the output conductor 23 as shown in FIG. A noise return loop 20 is formed in the ballast circuit 16. Furthermore, by embedding the input conductor 25 in the base material 28 of a magnetic material, an inductive component 29 and a resistance component 30 are generated in the input conductor 25, and the common mode noise is leaked to the power supply due to the noise absorption effect by resistance loss. Suppress noise.

[0053]

As is apparent from the above description, according to the present invention, the following effects can be obtained. In addition,
In the explanation, the same number as the claim number is attached to describe the effect of each claim. (1) A fluorescent lamp, a ballast circuit for lighting the fluorescent lamp, a conductive instrument body (apparatus housing) that houses the ballast circuit, and an electrical apparatus that is placed close to the fluorescent lamp and electrically connected to the instrument body. Connected conductive center cover (device housing)
Since the ballast circuit is mounted on the surface of the appliance body on the fluorescent lamp side via the dielectric base material made of a dielectric sheet, the ballast circuit and the appliance housing are provided between the fluorescent lamp and the appliance housing. Stray capacitance is reliably generated between them, and these stray capacitance form a return loop of common mode noise,
Common mode noise is not returned to the power supply, and power supply feedback noise is reduced.

(2) Since the ballast circuit is mounted on the surface of the center cover opposite to the fluorescent lamp via the dielectric base material made of a dielectric sheet, the impedance of the noise return loop becomes low, and the return The noise that flows into the loop increases, and the noise reduction effect increases.

(3) Since the surface of the center cover facing the fluorescent lamp is formed to have substantially the same shape as the outer peripheral surface of the fluorescent lamp, the facing area becomes large, and the stray capacitance between the fluorescent lamp and the equipment casing becomes large. Therefore, the effect of reducing noise is increased.

(4) Since the output conductors for connecting the ballast circuit and the fluorescent lamp are embedded on both sides of the dielectric base material, stray capacitance is generated between the output conductors and the equipment casing, and a noise return loop is newly added. Is formed on the surface, and the noise reduction effect is increased.

(5) Since the input conductors for connecting the power source and the ballast circuit are embedded in both sides of the dielectric base material, stray capacitance is generated between the input conductors and the equipment casing, and a noise return loop is newly added. Are formed, and the noise reduction effect is increased.

(6) Since the output conductor for connecting the ballast circuit and the fluorescent lamp is embedded in one side of the dielectric base material with a predetermined gap in the vertical direction, stray capacitance is generated between the output conductors and the normal capacitance is generated. A return loop of noise is also formed for the mode, and power supply feedback noise in the normal mode is also reduced.

(7) Since the input conductor that connects the power supply and the ballast circuit is embedded in one side of the dielectric substrate with a predetermined gap in the vertical direction, stray capacitance is generated between the input conductors, and the normal mode is set. Also, a noise return loop is formed, and the effect of reducing normal mode power supply feedback noise is obtained.

(8) Since the magnetic base material is provided on one side of the dielectric base material and the output conductor for connecting the ballast circuit and the fluorescent lamp is provided in the magnetic base material, the inductive component is provided in the output conductor. And a resistance component is generated, and the noise reduction effect is obtained by the noise absorption effect due to resistance loss with respect to common mode noise.

(9) Since the magnetic base material is provided on one side of the dielectric base material and the input conductor for connecting the power source and the ballast circuit is provided in the magnetic base material, an inductive component is generated in the input conductor. A resistance component is formed, and noise reduction effect is obtained by the noise absorption effect due to resistance loss with respect to common mode noise.

(10) A magnetic base material is provided on a part of both sides of the dielectric base material, and the base material of the dielectric base material and the magnetic base material are cleaved in the vertical direction on both sides. Since the input conductor that connects the power supply and the ballast circuit is provided, and the output conductor that connects the ballast circuit and the fluorescent lamp is embedded in the dielectric substrate, the return loop of the noise generated in the ballast circuit is newly added. Therefore, power supply feedback noise is reduced.

[Brief description of drawings]

FIG. 1 is an exploded perspective view of a first embodiment of the present invention.

FIG. 2 is a vertical sectional view of FIG.

FIG. 3 is a circuit diagram conceptually showing the operation of the first embodiment of the present invention.

FIG. 4 is an exploded perspective view of a second embodiment of the present invention.

FIG. 5 is a longitudinal sectional view of FIG.

FIG. 6 is an exploded perspective view of a third embodiment of the present invention.

7 is a vertical cross-sectional view of FIG.

FIG. 8 is a vertical sectional view showing a main part of a fourth embodiment of the present invention.

FIG. 9 is a circuit diagram conceptually showing the operation of the fourth embodiment of the present invention.

FIG. 10 is a vertical sectional view showing a main part of a fifth embodiment of the present invention.

FIG. 11 is a circuit diagram conceptually showing the operation of the fifth embodiment of the present invention.

FIG. 12 is a vertical sectional view showing an essential part of a sixth embodiment of the present invention.

FIG. 13 is a circuit diagram conceptually showing the operation of the sixth embodiment of the present invention.

FIG. 14 is a vertical cross-sectional view showing a main part of a seventh embodiment of the present invention.

FIG. 15 is a circuit diagram conceptually showing the operation of the seventh embodiment of the present invention.

FIG. 16 is a vertical sectional view showing an essential part of an eighth embodiment of the present invention.

FIG. 17 is a circuit diagram conceptually showing the operation of the eighth embodiment of the present invention.

FIG. 18 is a vertical sectional view showing a main part of a ninth embodiment of the present invention.

FIG. 19 is a circuit diagram conceptually showing the operation of the ninth embodiment of the present invention.

FIG. 20 is a perspective view showing a see-through state of a tenth embodiment of the present invention.

FIG. 21 is a circuit diagram conceptually showing the operation of the tenth embodiment of the present invention.

FIG. 22 is a perspective view of an essential part showing an example of a conventional fluorescent lamp lighting fixture.

[Explanation of symbols]

10 appliance body, 11 center cover, 13 fluorescent lamp, 15 dielectric base material, 16 ballast circuit, 17 noise filter, 18 common mode capacitor, 19a
~ 19c, 26 Stray capacitance (common mode), 20, 2
1, 27 Return Loop (Common Mode), 23 Output Conductor, 25 Input Conductor, 28 Magnetic Base Material, 29
Inductive component, 30 Resistance component.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Nao Hirashiro 1-1-1, Ofuna, Kamakura City Mitsubishi Electric Corporation Personal Information Equipment Development Laboratory

Claims (10)

[Claims] 1. A fluorescent lamp, a ballast circuit for turning on the fluorescent lamp, a conductive instrument body for housing the ballast circuit, an electrical instrument main body which is disposed close to the fluorescent lamp. And a conductive center cover connected to the fluorescent lamp, wherein the ballast circuit is mounted on the surface of the instrument body on the fluorescent lamp side via a dielectric base material made of a dielectric sheet. Light luminaire. 2. A fluorescent lamp, a ballast circuit for turning on the fluorescent lamp, a conductive instrument body that houses the ballast circuit, an electrical instrument main body that is disposed close to the fluorescent lamp, and is electrically connected to the instrument body. And a conductive center cover connected to the ballast circuit, wherein the ballast circuit is mounted on a surface of the center cover opposite to the fluorescent lamp via a dielectric base material made of a dielectric sheet. Fluorescent lighting fixtures. 3. The fluorescent lamp lighting fixture according to claim 2, wherein a surface of the center cover facing the fluorescent lamp is formed in substantially the same shape as an outer peripheral surface of the fluorescent lamp. 4. The fluorescent lamp lighting fixture according to claim 1, wherein an output conductor for connecting the ballast circuit and the fluorescent lamp is embedded in both sides of the dielectric base material. 5. The fluorescent lamp lighting fixture according to claim 1, wherein an input conductor for connecting a power source and a ballast circuit is embedded in both sides of the dielectric base material. 6. The fluorescent lamp according to claim 1, wherein an output conductor connecting the ballast circuit and the fluorescent lamp is embedded in one side of the dielectric base material with a predetermined gap in the vertical direction. lighting equipment. 7. The fluorescent lamp luminaire according to claim 1, wherein an input conductor connecting the power source and the ballast circuit is embedded in one side of the dielectric substrate with a predetermined gap in the vertical direction. . 8. A dielectric base material is provided on one side of the dielectric base material, and an output conductor for connecting the ballast circuit and the fluorescent lamp is provided in the magnetic base material. 1 or 2
The fluorescent lamp luminaire described. 9. The dielectric base material is provided on one side thereof with a magnetic base material, and the magnetic base material is provided with an input conductor for connecting a power supply and a ballast circuit. The fluorescent lamp luminaire according to 2. 10. A magnetic base material is provided on a part of both sides of the dielectric base material, and the base material of the dielectric base material and the magnetic base material are cleaved in the vertical direction of the both side parts. 3. The fluorescent lamp according to claim 1, wherein an input conductor for connecting the power source and the ballast circuit is provided, and an output conductor for connecting the ballast circuit and the fluorescent lamp is embedded in the dielectric base material. lighting equipment.