JPH0719057Y2 - lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a structure for grounding a lighting device of a lighting fixture directly mounted on a ceiling surface, for example, to the fixture body side.

[Prior Art] For example, as shown in FIG. 6, a conventional lighting fixture that uses a fluorescent lamp as a light source and is directly attached to the ceiling surface in a room is as follows.
The apparatus main body 1 fixed to the ceiling surface is provided. A fluorescent lamp (not shown) and a lighting unit 2 for lighting the fluorescent lamp are supported on the lower surface of the instrument body 1.

The lighting unit 2 includes a printed wiring board 3 on which various circuit components such as a transformer and a coil are mounted, and the printed wiring board 3 is housed together with the circuit components in a tubular metal case 4. The case 4 is divided into an upper case 4a and a lower case 4b, and the upper case 4a is clamped and fixed to the instrument body 1 via a metal screw 5.

By the way, in this type of luminaire, for example, when a short circuit accident occurs in the lighting unit 2 for some reason, a large current is blocked from flowing to the luminaire body 1 side to prevent electric shock. A circuit pattern 3a for grounding is provided on the printed wiring board 3 and the circuit pattern 3a is grounded.

As a structure for grounding the circuit pattern 3a, conventionally, the ground piece 6 cut and raised toward the lower case 4b side is provided on the upper surface of the upper case 4a, and the printed circuit board 3 is grounded. The terminal portion 7 connected to the above is provided, the terminal portion 7 and the grounding piece 6 are overlapped with each other, and tightened with a metal screw 8 and a nut 9.

Therefore, the printed wiring board 3 is grounded using the case 4 and the instrument body 1.

[Problems to be Solved by the Invention] However, according to this conventional configuration, since special screws 8 and nuts 9 for fixing the printed wiring board 3 to the upper case 4a are required, the number of parts is reduced accordingly. There is a problem that the cost increases and the cost increases.

Moreover, since the screw 8 needs to be screwed in the state where the printed wiring board 3 and the grounding piece 6 are aligned with each other, the printed wiring board 3 must be accurately positioned before the screwing. At the same time, the nut 9 into which the screw 8 is screwed is inserted into the back side of the grounded piece 6 that has been cut and raised, so that the mounting of the nut 9 is extremely troublesome.

For this reason, there is a problem in that grounding work of the printed wiring board 4 requires a great deal of labor, which hinders the automation of the assembly work of the lighting fixture.

The present invention has been made based on such a situation, and the special screws and nuts for grounding the printed wiring board are unnecessary, and the cost can be reduced and
When screwing the ground terminal to the fixture body, the ground terminal can be positioned and held using the terminal block, which is an essential component for connecting the printed wiring board and the lead wire. An object of the present invention is to provide a lighting fixture that can easily perform grounding work.

[Means for Solving the Problems] In order to achieve the above object, a lighting device according to the present invention includes a lighting unit in which a printed wiring board having a circuit pattern is housed in a tubular metal case. The apparatus main body includes the lighting unit incorporated therein, and a metallic screw member for fastening and fixing the case of the lighting unit to the apparatus main body.

Then, at both ends of the printed wiring board, terminal blocks made of synthetic resin for closing the opening portions at both ends of the case are attached respectively, and these terminal blocks are provided with a circuit pattern of the printed wiring board and lead wires inserted from the outside. And a terminal fitting for electrically connecting with, and a plate-like member having a contact piece connected to the circuit pattern for grounding of the printed wiring board, between the at least one terminal block and the case. In addition to interposing a ground terminal, the one terminal block integrally has a holding portion that fits and holds both side edges of the ground terminal and positions the ground terminal with respect to the case. It is characterized in that the ground terminal which is positioned and held is fixed in contact with the case through the screw member.

[Operation] According to this configuration, the grounding terminal can be fixed to the case by using the screw member for fixing the case to the instrument body, so that a dedicated screw or nuts for fixing the grounding terminal can be omitted. The number of parts can be reduced accordingly.

At the same time, the work of fixing the lighting unit to the fixture body and the work of grounding the printed wiring board can be performed at the same time by simply screwing a single screw member into the fixture body, so the number of work steps can be reduced. Therefore, the working time can be shortened, and the cost can be reduced together with the reduction in the number of parts.

Further, the ground terminal is fitted and held on the terminal block, and the position with respect to the case is determined by this fitting.Therefore, when screwing the ground terminal to the case, it is not necessary to adjust the mounting position of the ground terminal. Absent. Therefore, the work of fixing the ground terminal by the screw member can be easily performed, which is convenient for automating the work.

In addition, by using the terminal block, which is an essential configuration for connecting the circuit pattern on the printed wiring board and the lead wire,
The grounding terminal can be positioned, and a dedicated part for holding the grounding terminal in a predetermined position is not required before the grounding terminal is screwed to the case.

[Embodiment] A first embodiment of the present invention will be described below with reference to FIGS. 1 to 4.

FIG. 4 shows a luminaire for a fluorescent lamp which is directly attached to a ceiling surface for use, and the reference numeral 11 denotes a metallic instrument body. This instrument body 11 has an upper wall 11a directly attached to the ceiling surface.
And a side wall 11b extending downward from the peripheral portion of the upper wall 11a, and has a slender box shape with the lower surface opened as a whole.

At both ends of the instrument body 11, sockets 12 into which base pins (not shown) of a fluorescent lamp are inserted are provided.
The socket 12 is supported by the instrument body 11 via a bracket 13 and projects downward from the instrument body 11.

A lighting unit for lighting the fluorescent lamp, for example, a ballast 14 is attached to a central portion of the instrument body 11 along the longitudinal direction. The ballast 14 includes a printed wiring board 15 on which various circuit components such as a coil and a transformer are mounted, and the printed wiring board 15 is housed in a metal case 16 in the shape of a rectangular tube together with the circuit components. ing. The case 16 has an upper case 16a and a lower case 16b as shown in FIG.
It is divided into and. Screw holes 17 are formed at both ends along the longitudinal direction of the upper case 16a, and the screw holes 17 coincide with the insertion holes 18 formed in the upper wall 11a of the instrument body 11.

For this reason, in the case 16 of the ballast 14, the metal screw 19 is inserted into the screw hole 17, and the insertion end is inserted into the insertion hole of the instrument body 11.
By guiding to 18 and tightening with nut 20,
The upper wall 11a is fixed in a surface contact state.

At both ends of the case 16, synthetic resin terminal blocks 21, 22
Is provided. The terminal blocks 21 and 22 are a pair of terminal accommodating portions 23.
Is equipped with. On the upper surface 23a and the lower surface 23b of these terminal accommodating portions 23, convex portions 24 are respectively provided so as to project.
4 is a fitting hole 25 formed in the upper case 16a and the lower case 16b
Is fitted to.

Therefore, by this fitting, the terminal blocks 21 and 22 and the upper case 16a
The lower case 16b is connected, and the upper and lower cases 16a, 16b are connected to each other.

In addition, the terminal blocks 21 and 22 include an escape recess 26 between the pair of terminal accommodating portions 23. The escape recesses 26 are continuously opened to the end faces exposed to the outside of the terminal blocks 21 and 22, and the upper and lower surfaces connected to the end faces. The escape recess 26 is the upper case 16a.
The screw holes 17 of the case 16 are exposed to the outside through the relief recesses 26, and both ends of the lower case 16b are cut to match the escape recesses 26. The notch 27 is formed.

The end face 23c of the terminal accommodating portion 23 facing the inside of the case 16 has a third
As shown in the figure, a stepped portion 30 that receives both ends of the printed wiring board 15 and a terminal accommodating chamber 31 that opens toward the inside of the case 16 are provided.
Are formed.

An insertion hole 33, into which a lead wire 32 from a power source is inserted, is formed in the terminal housing portion 23 of one of the terminal blocks 21 at an end surface 23d exposed to the outside thereof. Insertion hole 33 is the terminal accommodating chamber
An opening 31 is provided, and a self-locking terminal fitting 34 is housed in the terminal housing chamber 31. Terminal fitting 34 is an insertion hole
An elastically deformable locking piece 35 that holds and holds the lead wire 32 inserted from 33, and a connecting piece 36 that is led to the step portion 30.
Is equipped with. The connection piece 36 is inserted into a connection hole 37 provided in the printed wiring board 15, and a tip portion thereof is soldered to a circuit pattern 38 printed on the printed wiring board 15.

In addition, in the terminal accommodating portion 23 of the other terminal block 22, a plurality of insertion holes into which the lead wires from the socket 12 are inserted, and a self-locking type terminal fitting (not shown) that is in contact with the lead wires. ) Is provided. Connection pieces for these terminal fittings 36
Is the connection hole 37 of the printed wiring board 15 as shown in FIG.
, And the tip portion thereof is soldered to the circuit pattern 38.

By the way, the ground terminal 40 is attached to one of the terminal blocks 21. The ground terminal 40 includes a rectangular plate-shaped base 41 interposed between the terminal block 21 and the upper case 16a, and a contact piece 42 extending from one end of the base 41 to the printed wiring board 15 side. A mounting hole 43 that matches the screw hole 17 of the upper case 16a is formed in the center of the base portion 41.
A screw 19 for fixing the case 16 is inserted into the.

The base 41 is provided at a position corresponding to the escape recess 26 of the terminal block 21, and both side edges of the base 41 are escape recesses 26.
Spans both sides of the terminal accommodating portion 23 connected to. As shown in FIGS. 1 and 2, recesses 44 to which both side edge portions 41a of the base portion 41 are fitted are formed on both side portions of the terminal accommodating portion 23. Therefore, the base 41 is held by the terminal block 21 with the mounting hole 43 aligned with the screw hole 17 of the case 16 by fitting with the recess 44.

Therefore, in the ground terminal 40, the case fixing screw 19 is inserted through the mounting hole 43 and the screw hole 17, and the insertion end is attached to the nut 20.
It is fixed to the upper case 16a by tightening with
The entire surface of the base 41 is in close contact with the upper case 16a.

Further, as shown in FIG. 2, the contact piece 42 of the ground terminal 40 is located in the case 16, and the tip of the contact piece 42 is inserted into the terminal hole 45 of the printed wiring board 15.
It is soldered to the grounding circuit pattern 38a on the upper part 15.

Next, a procedure for assembling the ballast 14 and a procedure for mounting the ballast 14 on the instrument body 11 will be described.

First, the base 41 of the ground terminal 40 is placed on the upper case 16a, and the mounting hole 43 of the base 41 and the screw hole 17 of the upper case 16a are aligned with each other.

Next, the terminal blocks 21 and 22 are placed on both ends of the upper case 16a, and the convex portions 24 of the terminal blocks 21 and 22 are fitted into the fitting holes 25 of the upper case 16a. At this time, since the concave portion 44 is formed in the terminal accommodating portion 23 of the one terminal block 21, the base portion 41 is formed in the concave portion 44.
Both side edge portions 41a are fitted. By this fitting, the ground terminal 40 is positioned and held with the mounting hole 43 of the ground terminal 40 aligned with the screw hole 17, and undesired movement is prevented.

Next, the printed wiring board 15 is superposed on the stepped portion 30 of the terminal blocks 21 and 22, the connection piece 36 of the terminal fitting 34 is inserted into the connection hole 37 and soldered, and the contact piece 42 of the ground terminal 40 is inserted.
Insert into the terminal hole 45 and solder.

After this, the terminal blocks 21, 22 and the upper case 16a are connected to the lower case 16b.
Cover the terminal blocks 21, 22 with the protrusions 24 of the terminal blocks 21, 22 in the fitting holes 25 of the upper case 16a.
To fit. By this fitting, the case 16 having a rectangular tube shape is formed, and the opening portions at both ends of the case 16 are closed by the terminal blocks 21 and 22 connected to the printed wiring board 15.
Assembly of 4 is completed.

On the other hand, in order to fix the ballast 14 to the device body 11, first, the case 16 is placed on the upper wall 11a of the device body 11.
At this time, since the mounting hole 43 of the ground terminal 40 exposed from the escape recess 26 of the terminal block 21 is aligned with the screw hole 17 of the case 16, the mounting hole 40 is inserted through the insertion hole 18 on the instrument body 11 side.
Align with.

Next, the screw 19 is inserted into the mounting hole 43 from the recess 26, the tip of the screw 19 is sequentially passed through the screw hole 17 and the insertion hole 18, and the nut 20 is tightened from the instrument body 11 side. By this tightening, the ballast 14 is fixed to the device body 11, and the ground terminal 40 is also connected to the device body 11 via the screw 19 and the case 16, so that the grounding of the printed wiring board 15 is completed.

According to the first embodiment having such a configuration, the ground terminal 40 connected to the ground circuit pattern 38a of the printed wiring board 15 is connected.
Is grounded to the case 16 side by using the screw 19 for fixing the case 16 of the ballast 14 to the fixture body 11, so there is no need for special screws or nuts for grounding the printed wiring board 15. Therefore, the number of parts of the ballast 14 can be reduced accordingly.

Further, since the work of fixing the ballast 14 to the fixture body 11 and the work of grounding the printed wiring board 15 are performed at the same time, the number of work steps can be reduced and the work time required for assembling the lighting fixture can be significantly shortened. .

Therefore, the cost can be reduced in addition to the reduction in the number of parts.

Moreover, the grounding terminal 40 is positioned and held by fitting the mounting hole 43 into the screw hole 17 by fitting the grounding terminal 40 into the recess 44 of the terminal block 21, so that the screw 19 can be easily inserted.

Therefore, the workability of assembling the ballast 14 is significantly improved,
It is also convenient for automating this assembly work.

Further, in the above configuration, the terminal block 21 necessary for connecting the printed wiring board 15 and the lead wire 32 is connected to the ground terminal 40.
Since it can be used as a member to hold the ground terminal
There is no need for a dedicated component for positioning the 40, which also has the advantage of contributing to a reduction in the number of components.

The present invention is not limited to the first embodiment, and FIG. 5 shows a second embodiment of the present invention.

In this second embodiment, the terminal accommodating portion 23 facing the escape recess 26
On the side surface 51 of the fitting groove 5 extending along the upper wall 16a of the case 16.
2 is formed, and the fitting groove 52 is opened in both end faces 23c, 23d of the terminal accommodating portion 23.

Further, on both sides of the base portion 41 of the ground terminal 53, insert piece portions 54 bent into an L-shaped cross section are formed, and the insert piece portions 54 are inserted into the fitting groove 52. .

Therefore, in the case of this embodiment, the fitting groove 52 is not connected to the ground terminal 53.
This is a holding part for positioning and holding
53 is attached to the upper case 16a while being assembled to the terminal block 21.

Further, the lighting fixture according to the present invention is not limited to one directly attached to a ceiling surface and used, but may be one attached to a side wall of a room for use.

[Advantages of the Invention] According to the present invention described in detail above, the dedicated screws and nuts for fixing the ground terminal can be omitted, and the number of parts of the lighting unit can be reduced. At the same time, the work of fixing the lighting unit to the fixture body and the work of grounding the printed wiring board can be done at the same time by simply screwing a single screw member into the fixture body. The work time required for assembling the device can be shortened. Therefore, the cost can be reduced together with the reduction in the number of parts.

Also, the ground terminal is fitted and held on the terminal block, and the position with respect to the case is determined by this fitting.Therefore, when fixing the ground terminal to the case via the screw member, adjust the mounting position of the ground terminal. do not have to. for that reason,
The work of fixing the grounding terminal by the screw member can be easily performed, which is convenient for automating the work.

In addition, according to the above configuration, it is possible to position the ground terminal by using the terminal block, which is an essential configuration for connecting the circuit pattern on the printed wiring board and the lead wire. Prior to screwing to the case, there is no need for a dedicated part for holding the ground terminal at a predetermined position, which is also advantageous in that the number of parts can be reduced.

[Brief description of drawings]

FIGS. 1 to 4 show a first embodiment of the present invention.
Fig. 2 is an exploded perspective view of the lighting unit, Fig. 2 is a sectional view showing the mounting state of the ground terminal, Fig. 3 is a sectional view of the terminal block, Fig. 4 is a perspective view of the entire lighting fixture, and Fig. 5 is the present invention. 2 is a perspective view showing a second embodiment of the present invention, and FIG. 6 is an exploded perspective view of a conventional lighting unit. 11 ... Fixture body, 14 ... Lighting unit (ballast), 15 ... Printed wiring board, 16 ... Case, 19 ... Screw member (screw), 2
1,22 ... Terminal block, 32 ... Lead wire, 34 ... Terminal fittings, 38,38a ...
Circuit pattern, 40, 53 ... Ground terminal, 44, 52 ... Holding part (recess, fitting groove).

Claims (1)

[Scope of utility model registration request] 1. A lighting unit in which a printed wiring board having a circuit pattern is accommodated in a tubular metal case, a fixture body in which the lighting unit is incorporated, and a case of the lighting unit in the fixture body. A metal screw member for tightening and fixing is provided, and a synthetic resin terminal block for closing the openings at both ends of the case is attached to both ends of the printed wiring board. It has a terminal fitting for electrically connecting the circuit pattern of the board and a lead wire inserted from the outside, and a circuit for grounding the printed wiring board between at least one of the terminal blocks and the case. While interposing a plate-shaped ground terminal having a contact piece connected to the pattern, the one terminal block fits and holds both side edges of the ground terminal, A lighting device characterized in that it has an integrated holding portion for positioning the ground terminal with respect to the case, and the ground terminal positioned and held on the terminal block is fixed in contact with the case via the screw member. .