JPH03219596A - Discharge lamp lighting device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a discharge lamp lighting device for lighting a fluorescent lamp or the like using an inverter lighting method.

[Prior Art] This type of lighting device uses an inverter oscillation circuit that controls on/off of a transistor and an inverter transformer to generate high frequency waves to light a discharge lamp connected to the output end of the inverter transformer. Conventional examples thereof are shown in FIGS. 7 and 8.

The case indicated by the reference numeral 1 in FIG.
It is formed from. The case body 2 is equipped with an insulating paper 13 that is bent into a U-shape, and the case body 2 has through holes 12 provided at both lengthwise ends of the main plate 2a (only one side is shown in FIG. 8). (as shown) through the fixed part (
(not shown) to the inner surface of the chassis of a lighting fixture (not shown). The case lid 3 is removably attached to the case body 2, and its side plates 3a are arranged to overlap the outer surfaces of the side plates 2b of the case body 2 in a somewhat elastically deformed state. A bulging protrusion 5 formed on the side plate 3a is hooked into the latching hole 4 of the side plate 2b, and the case body 2 and the case lid 3 are connected by the engagement.
Case 1 is ready to be assembled.

A heat sink 6 is screwed to one side plate 2b of the case body 2, and the main plate 2a of the case body 2 is attached to the heat sink 6.
A printed wiring board 7 arranged parallel to is screwed. The printed wiring board 7 has a rare printed wiring pattern only on one side of the main board portion 2a. Various electrical components 8 (
Terminal blocks 9 and 10 are installed at both ends of the one side (only one shown in the figure), respectively. Circuits necessary for the discharge lamp lighting device such as a rectifier circuit, an inverter oscillation circuit, a lighting circuit, and a protection circuit are formed. It is attached to the printed wiring board 7 by soldering to the wiring pattern.The reference numeral 11 designates a switching transistor included in the inverter oscillation circuit, which is a type of electrical component 8, and is attached to the heat sink 6.
is closely related to

The terminal blocks 9, 10 have lead wire insertion ports 9a, 10a on the end face on the side of the case lid 3, and these insertion ports 9a,
A vertically elongated structure having a built-in self-locking terminal fitting (not shown) to which a lead wire inserted through 10a is connected is used. The terminal block 9 disposed at one end of the printed wiring board 7 is used for power supply connection, and the terminal block 10 disposed at the other end of the board 7 is used for internal wiring of the instrument.

[Problems to be Solved by the Invention] By the way, among the electrical components 8, many of the electrical components 8 that form a power supply circuit, a filter circuit, a rectifier circuit, an inverter oscillation circuit, and a lighting circuit that supply energy for lighting a discharge lamp are , the voltage and current values are large on average, and therefore the heat generation of these electrical components 8 is large. In addition, many of the electrical components 8 that form the protection circuit that guarantees the normal operation of this lighting device have relatively low voltage and current values, so
Its fever is small.

However, conventionally, all of these various electrical components 8 are installed on one side of the printed wiring board 7 in a mixed manner. It was necessary to ensure a large distance between the electrical component 8 and the component 8 so as to reduce the influence of the heat generated by the electrical component 8, which generates a large amount of heat. Therefore, conventionally, the area of the printed wiring board 7 on which the various electrical components 8 described above are attached is large, and therefore the length and width of the case 1 are large, making the entire discharge lamp lighting device large. There was a problem.

An object of the present invention is to obtain a discharge lamp lighting device that can be miniaturized.

[Means for Solving the Problems] In order to achieve the above object, the discharge lamp lighting device of the present invention includes a printed wiring board housed in a cylindrical case with openings at both ends, consisting of a case body and a case lid. Among the various electrical components to be attached to the board, lead terminals having electrical components with large voltage and current values are passed through the printed wiring board, and these electrical components are attached to one surface of the printed wiring board, and Among the various electrical components, other electrical components with small voltage and current values are formed as small surface-mounted components, and these are surface-mounted on the other surface of the printed wiring board.

[Function] The discharge lamp lighting device of the present invention has electrical components that generate a large amount of heat due to their large voltage and current values mounted on one surface of the printed wiring board, and small surface-mounted components that are mounted on the other surface of the printed wiring board. At the same time, since electrical components that generate less heat due to their lower voltage and current values are surface-mounted, both types of electrical components can be arranged so as to overlap along the thickness direction of the printed circuit board. Therefore, the volumetric packaging density of various electrical components can be improved, and the printed wiring board interposed between them can block the thermal influence of electrical components that generate a large amount of heat on electrical components that generate a small amount of heat.

[Example] Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 6.

Reference numeral 21 in FIGS. 1 and 2 indicates a case made of an aluminum alloy plate and having a substantially rectangular cylindrical shape with both ends opened, and is formed of a case body 22 and a case lid 23.

As shown in FIGS. 2 and 3, the case body 22 has side plate portions 22b on both side edges of a main plate portion 22a, each extending in a direction perpendicular to the plate portion 22a, and has a U-shaped cross section. . The case body 22 has fixing holes 24 (only one shown in FIG. 3) at both longitudinal ends thereof. The case body 22 is adapted to be attached to the chassis of a fluorescent light fixture (not shown) directly on the ceiling via fixing tools such as screws (not shown) passing through these fixing holes 24.

An insulating film 25 such as a polyester film is attached to the inner surface of the case body 22.

The case body 22 is obtained by attaching an insulating film 25 to one side of a plate material, which is the raw material, and then bending the plate material by press working so that the film 25 is on the inside.

As shown in FIGS. 2 and 3, the case lid 23 also has side plate portions 23b on both side edges of the main plate portion 23a, which extend in a direction perpendicular to the plate portion 23a, and have a U-shaped cross section. There is. An insulating film 26 such as a polyester film is also attached to the inner surface of the case lid 23. Case lid 2
3 was also obtained by the same manufacturing method as the case body 22 described above.

The side plate portion 23b of the case lid body 23 is stacked closely against the outer surface of the side plate portion 22b of the case body 22 due to its elastic force, and these side plate portions 22b, 23
b comrades are connected. This connection is made by hooking a plurality of bulging protrusions (not shown) formed on the side plate 23b into a plurality of latching holes (not shown) formed in the side plate 22b, respectively.

A terminal block 27 is disposed at one end of the case 21 in the length direction so as to close an opening at one end of the case 21, and a terminal block 27 is disposed at the other end of the case 21 in the length direction.
A terminal block 28 is arranged to close the opening at the other end.

Each main plate portion 22a of each terminal block 27,28.

A pair of engagement protrusions 29 (
Only the engagement protrusions 29 on the lower surface side are shown in FIG. 3) are integrally provided, and these protrusions 29
It is fitted into an engagement hole 30 (only the engagement hole 30 on the case lid 23 side is shown in FIG. 3) formed closer to the side plate portions 22b and 23b. Through these fittings, each of the terminal blocks 27 and 28 is positioned and fixed to the end of the case 21 so as not to come off.

Each terminal block 27, 28 has a lead wire insertion port 31 on the end surface exposed to the end opening of the case 21, as shown in FIG. This metal fitting 3 is as shown in the illustration.
A lead terminal portion 32a for connection to a printed wiring board 34, which will be described later, is provided on a part of the lead terminal 2.

One terminal block 27 is used for power connection, and has a total of six lead wire insertion ports 31 for power supply lead-in wiring, power supply wiring, ground wiring and its transmission wiring. It has a terminal fitting 32. Similarly, the other terminal block 28 has a total of two lead wire insertion ports 31 and a terminal fitting 32 for electrical wiring, that is, into which lead wires leading to a lamp socket or the like are inserted.

Each of the above terminal blocks 27 and 28 has its lead wire insertion port 31
It has a stepped portion 33 on the opposite side from the open end surface. Between each terminal block 27 and 28, a printed wiring board 34 is connected at both ends in the longitudinal direction to the step part 33, and the main board parts 22a, 23 are connected to each other.
It is constructed parallel to A. This board 34 and the stepped portion 3
3, each terminal block 2 is connected to the connection hole 35 (see FIG. 3) provided at both lengthwise ends of the printed wiring board 34.
This is accomplished by inserting the lead terminal portion 32a of 7.28 and then soldering the lead terminal portion 32a to the printed wiring board 34 at this insertion portion.

The printed wiring board 34 is formed by providing a printed wiring pattern on only one side of a glass epoxy laminated board, and a terminal portion of the printed wiring pattern is provided with a bat (not shown) for soldering a small surface mount component to be described later. ) is provided. Since the connection hole 35 is formed on a land portion of the printed wiring pattern (not shown), the terminal fitting 32 and the printed wiring pattern are electrically connected at the same time by the above connection.

The lighting device is assembled by positioning and arranging the terminal blocks 27 and 28 from above at both ends of the case body 22, which is arranged with the main plate part 22a as the bottom.
Both ends of a printed wiring board 34 on which electrical components (to be described later) are mounted are placed on the board fixing part 33, and at the same time, the lead terminal parts 32a are inserted into the connection holes 35, and then the lead terminal parts 32a are inserted into the printed wiring board 34. Finally, the case lid 23 is fitted onto the case body 22 from above, and these are connected to form the case 21, using special connecting parts such as screws. Easy to assemble.

Various electrical components and a heat sink 36 necessary for the discharge lamp lighting device are attached to the printed wiring board 34. The electrical components include a fuse 37, a varistor TNR1 for surge absorption, various electrical components forming a filter circuit A for cutting noise, various electrical components forming a rectifier circuit RFC, and a power supply circuit B for inverter oscillation. various electrical components that form the inverter oscillation circuit C, various electrical components that form the lighting circuit that receives the high frequency output generated by the inverter oscillation circuit C and lights up the fluorescent lamp 38, and a protection circuit E that prevents damage to the inverter oscillation circuit C due to voltage fluctuations and allows the lighting device to operate normally.
Various electrical components are used to form the

The wiring relationships among these various electrical components are as shown in FIG.
C2, noise filter BNT, and choke coil L
It is formed by each electrical component of 1. Rectifier circuit REC
are four diodes R forming a diode bridge circuit.
It is formed by ECCI to RECC4 (see FIG. 4).

The above power supply circuit B includes capacitors C3 and C4, film capacitor C5, varistor TNR2, resistors R1 to R4, diodes D1 to D3, and smoothing electrolytic capacitors C6 and C.
7 electrical components.

The inverter oscillation circuit C includes a varistor TNR3, a film capacitor C9, resistors R6 to R8, and a diode D4.
．． D12. D13, capacitor 3 C10, electrolytic capacitor C21, transistor Q1, and magnetic leakage type inverter transformer IVT.

The above lighting circuit consists of capacitor CI2. C15゜C16
, C18, electrolytic capacitor C17, diode D9 to Dl
l, Zener diode ZD2, resistors 19, 20, h transistor Q5, photodiode POD for photocoupler,
and each electrical component of the fluorescent lamp 38.

The above protection circuit E includes capacitors C1l, C13°C14
, C19, C20, electrolytic capacitor C8, resistor R9~1
8, variable resistor VR, h transistor Q2-Q4, Zener diode ZDI, diode D5-8, transformer CT,
and a phototransistor PCQ for a photocoupler.

Of the various electrical components listed above, each of the components listed below is a component that is inserted and installed with a lead terminal S (see Figures 1 and 2), and their voltage and current values are large on average. . Fuse 37, 4 Varistor TNR1~TNR3, Capacitor c1~C5,
C9, CIO, CI2. CI4. C18, electrolytic capacitors C6 to C8, C17, C21, noise filter BNT
, choke coil L1, diode FRECC1~REC
C4, diode D4゜D13, resistor R5, R18, transformer cT1 photocoupler PCD, PCQ, inverter transformer VT0 And these parts are inserted and installed at their lead terminals S
are inserted into the printed wiring board 34 and these lead terminals S are soldered to the printed wiring pattern of the board 34, thereby being attached to the surface of the board 34 where the printed wiring pattern is not provided. FIG. 4 shows a state in which the components are mounted on the printed wiring board 34.

Note that the insulated switching transistor Q1 included in the inverter oscillation circuit C includes a printed wiring board 3.
A screw 40 inserted from the case lid 23 side of No. 4 is passed through. The heat sink 36 is screwed onto the tip 5 of the screw 4o. therefore,
The heat sink 36 is in close contact with the transistor Q1. The other portion of the heat sink 36 is in close contact with the main plate portion 22a of the case body 22, as shown in FIG. 2, so that the heat of the transistor Q1 is radiated to the case body 22.

Furthermore, the inverter transformer IVT, which has the largest height dimension among the components, is inserted and installed through a through hole (or notch) 41 formed in the printed wiring board 34 as shown in FIG. It is set up through. Therefore, the protruding height H of this inverter transformer IVT from the printed wiring board 34 toward the case body 22 side is small, and each of the above-mentioned insertion and mounting components is positioned within this height H. There is. For this reason, when inserting and mounting the electrolytic capacitors C6 and C7, film capacitors C5°C9, and varistor TNR3, which have long vertical dimensions among the components, the lead terminals S are bent into an L shape as shown in Fig. 1. It is attached to the printed wiring board 346 in a horizontal position.

Therefore, when inserting and mounting the inverter transformer IVT and other components installed in this way, the protrusion height H of these components from the printed wiring board 34 should be reduced and the heights should be aligned at approximately the same position by arranging the components. I can do it.

Furthermore, an insulating film 25 is pasted on the inner surface of the case body 22 that covers these parts, and the above-described insertion and attachment allows the parts to be brought close to or in contact with the inner surface of the main plate portion 22a of the case body 22. Therefore, the height X required for arranging the component between the printed wiring board 34 and the main plate portion 22a of the case body 22 can be reduced to, for example, 13 mm by the above-mentioned insertion and mounting.

Furthermore, among the various electrical components described above, the voltage and current values of the components other than those inserted and mounted are relatively small, and all of these electrical components are formed of small surface-mounted components. The electrical components that are surface-mounted components are listed below. Resistance R1~R4, R6
~R17°R19~R2], variable resistor VR, diode D17 ~D3. D5-D12, Zener diode ZD1, Z
D2, transistors Q2 to Q5, capacitors C1l, C
13, C15, C16, C19°C20° These small surface mount components are inserted and mounted on the printed wiring board 34 on the side opposite to the side on which the components are placed, that is, on one side on which the wiring pattern is provided. Implemented. FIG. 5 shows a state in which these small surface mount components are attached to a printed wiring board 34.

By employing such small surface mount components, these can be mounted approximately within the protruding height of the lead terminal S from the printed wiring board 34 to the case lid 23 side, and
Since the insulating film 26 is attached to the inner surface of the case lid 23, the lead terminals S and small surface mount components can be provided close to the main plate portion 23a of the case lid 23.

Therefore, the height Y required to arrange the lead terminals S and small surface mount components between the printed wiring board 34 and the main plate 23a of the case lid 23 is as small as, for example, 3 cm. can.

Therefore, in this embodiment, the height dimension X,
Since each of Y can be made smaller, the thickness of the case 21, that is, the thickness Z of the entire device can be made as thin as, for example, 20+nm, thereby making it possible to reduce the thickness of the shaped lighting fixture by directly mounting the lighting device on the ceiling.

The various electrical components described above are attached to the printed wiring board 34 in the following manner.

First, in the above-mentioned insertion and installation of various electrical components, the lead terminals S of the components are inserted into the printed wiring board 34, and the ends are temporarily fixed by bending or crushing them. next,
After applying an ultraviolet curable adhesive to the butt portion of the printed wiring board 34 on which the printed wiring pattern is provided, the small surface mount component is placed so that the terminals are located on the butt portion. Thereafter, the adhesive is cured by irradiating ultraviolet rays and temporarily fixed to the printed wiring board 34.

Finally, the lead terminals of the component and the terminals of the small surface mount component are simultaneously soldered 9 to the printed wiring pattern using the solder dip method. As a result of the above, the printed wiring board 34 of various electrical components
5 installations are made.

In the discharge lamp lighting device configured as described above, various electrical components including lead terminals S are mounted on one side of the printed wiring board 34 on which no printed wiring pattern is provided.

These components are electrical components that generate a large amount of heat because their average voltage and current values are large and their temperature rise is also large. In addition, in these insertion installations, small surface mount components are used for various electrical components other than components, and these mounting components are mounted by surface mounting on the other side of the printed wiring board 34 on which the printed wiring pattern is provided. . These small surface mount components have relatively low voltage and current values, so they generate little heat.
It is an electrical component with a small temperature rise value.

In other words, in this discharge lamp lighting device, various electrical components are sorted according to their size and amount of heat generated.
By separately attaching these to both sides of the printed wiring board 34, various electrical components are arranged so as to overlap along the thickness direction of the printed wiring board 34.

Therefore, the volumetric packaging density of various electrical components has been improved,
Since the length and width of the case 21 can be reduced, the entire lighting device can be made smaller.

Despite such miniaturization, the printed wiring board 34 interposed between these parts can block the thermal influence from the insertion mounting of large heat generating small surface mount components with low heat generation. , there is no risk of small surface mount components being destroyed by heat.

Note that the present invention is not limited to the above embodiment.

For example, the connection between the case main body and the case lid, the connection between the case and the terminal block, and the connection between the stepped portion and the printed wiring board may be performed using fixing tools such as screws. In addition, electromagnetic parts, which are large electrical parts, such as noise filters,
The choke coil, pulse transformer, etc. are placed between the case body 22 and the case lid 23 by passing them through the through holes or notches of the printed wiring board 34 in the same way as the inverter transformer IVT. There is no problem even if it is attached to the printed wiring board 34.

[Effects of the Invention] In the discharge lamp lighting device of the present invention as described above, among the various electrical components attached to the printed wiring board housed in the cylindrical case with openings at both ends, consisting of a case body and a case lid, , the lead terminals of electrical components with large voltage and current values are passed through the printed wiring board, these electrical components are attached to one surface of the printed wiring board, and the voltage and current values of the various electrical components are By forming other electrical components with small values as small surface mount components and mounting them on the other side of the printed wiring board, the thermal influence of electrical components with large heat generation on electrical components with low heat generation can be reduced. The printed wiring board interposed between them eliminates the need to provide large distances between electrical components that generate large amounts of heat and small electrical components, and improves the volumetric packaging density of various electrical components. The overall size can be reduced.

2

[Brief explanation of drawings]

1 to 6 show one embodiment of the present invention, FIG. 1 is a longitudinal cross-sectional side view of the entire device taken along line 1-1 in FIG. 4, and FIG. Fig. 3 is an exploded perspective view of the entire device, Fig. 4 is a view of the printed wiring board on which electrical components are mounted, seen from one side, and Fig. 5 is a cross-sectional view of the entire device passing through the FIG. 6, which is a view seen from the front side, is an electrical circuit diagram. 7 and 8 show a conventional example, and FIG. 7 is a sectional view,
FIG. 8 is a perspective view. 21... Stabilizer case, 22... Case body, 23
...Case lid body, 22 a + 23 a... Main plate part, 22b, 23b... Side plate part, 27.28...
Terminal block, 34...Printed wiring board, 37. TNRI
~TNR3, C1~C5, C9, CIO, CI2゜C1
4, C18, C6~C8, C17, C21°BNT, L
l, RECCI~RECC4, D4゜DlB, R5, R
18, CT, PCD, PCQ. IDT... Electrical component to be inserted and attached, S... Lid terminal, R1-R4, R6-R17, R19~3 R21, VR, Dl~D3. D5-D12. Z
Dl, ZD2. Q2-Q5. C1l,
C13, C15, C16, C19, C20... electrical components to be surface mounted.

Claims (1)

[Claims] A case body having side plate portions on both side edges of a main plate portion,
A cylindrical case with openings at both ends, which has side plate parts on both sides of the main plate part, and a case lid body which overlaps and connects these side plate parts to the side plate part of the case body; A printed wiring board that is housed away from the main board and has various electrical components that form the necessary circuits such as a power supply circuit, an inverter oscillation circuit, a lighting circuit, and a protection circuit installed, and the printed wiring board that is electrically connected to the printed wiring board. and a terminal block connected to each other and installed inside both ends of the case body, the lead terminals of the electrical components having high voltage and current values among the various electrical components mentioned above are passed through the printed wiring board. Then, these electrical components are attached to one surface of the printed wiring board, and other electrical components with small voltage and current values are formed from small surface mount components, and these are mounted on one surface of the printed wiring board. A discharge lamp lighting device characterized by surface mounting on the other side of a wiring board.