JP2564364Y2 - lighting equipment - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lighting device having a discharge lamp and a lighting block, and more particularly to a structure for electrically connecting a lamp socket of a discharge lamp to a lighting device for a discharge lamp mounted on a printed circuit board. Things.

[0002]

2. Description of the Related Art An example of a lighting fixture using a round fluorescent lamp is shown in FIGS. In the figure, an octagonal printed circuit board 1 is housed inside a cylindrical instrument body 8,
A choke 2, a transistor 3,
A round fluorescent lamp inverter lighting device 5 including a rectifier 4 and the like, and a pair of connectors 7 electrically connected to the lighting device 5 are mounted. The connector 7 is connected to a terminal connection portion 6a of a lamp holder 6, and a socket portion 6b of the lamp holder 6 is connected to a round fluorescent lamp 10A.
Are detachably connected. Also, the connector 7 is shown in FIG.
(A) As shown in FIG.
The housing 30 is fixed to the printed circuit board 1 by fixing claws 30a, and the contact element 31 is connected to the soldering portion 21 of the printed circuit board 1. The receiving terminal (not shown) of the lamp holder 6 is detachably connected to the contact 31. Since the connector 7 is provided at the end of the printed circuit board 1 shown in FIG. 9, the radial dimension of the round fluorescent lamp 10A is larger than the outer diameter of the printed circuit board 1, and The apparatus main body 8 becomes larger in the radial direction. Further, since the connector 7 is composed of the contacts 31 and the resin housing 30, the structure becomes complicated due to the increase in the number of parts, and the assembling property is reduced.

Therefore, as shown in FIGS. 11 (a) and 11 (b), another example using a single base fluorescent lamp 10B is known. One end of a lead wire 12 is connected to the lamp socket 11 into which the single-base fluorescent lamp 10B is inserted by rotating operation, and the other end of the lead wire 12 is connected to the printed circuit board 1 (FIG. 9) by soldering. Generally, they are connected. Further, the lamp socket 11 is fixed to the fixture body 8 (FIG. 9) in order to prevent the force at the time of attaching and detaching the one-base fluorescent lamp 10B from being applied to the printed circuit board 1. However, when the lamp socket 11 is fixed to the fixture body 8, it is necessary to provide a wiring space for the lead wire 12 between the printed circuit board 1 and the lamp socket 11, and the fixture body 8 is enlarged in the axial direction by this space. Become Further, it is necessary to individually connect the lead wires 12 to a total of eight places on the lamp socket 11 side and the printed circuit board 1 side, and this connection work becomes extremely complicated, and there is a problem that the assemblability also deteriorates. .

Therefore, in order to reduce the size of the device main body 8 and improve the assemblability, as shown in FIG. 12, a group of pin terminals 20 is erected on the printed circuit board 1 and
A method may be considered in which the group 0 is electrically connected to the inverter lighting device 5 and the lamp socket 12 having the receiving terminal structure is detachably connected to the group of pin terminals 20. By directly connecting the lamp socket 12 and the printed circuit board 1 in this manner, there is no need to provide a wiring space for the lead wire 12 between the two, 1 and 12, or to perform the work of connecting the lead wire 12 as in the related art. In addition, the height of the lamp can be minimized, and the apparatus body 8 can be made compact and the structure can be simplified.

[0005]

[Problems to be Solved by the Invention] By the way, FIG.
In order to prevent the force at the time of attaching and detaching the single base fluorescent lamp 10B from being applied to the electrical connection between the pin terminal 20 and the lamp socket 12 and the soldered portion of the pin terminal 20, the method shown in FIG. 1 must be fixed to the instrument body 8 side, in this case, the pin terminals 2
The mutual movement of the electrical connection between the group 0 and the lamp socket 12 is prevented. In this state, if the temperature inside the lighting fixture fluctuates due to a change in the use environment or self-heating, a difference occurs between the coefficient of thermal expansion of the resin lamp socket 12 and the coefficient of thermal expansion of the printed circuit board 1 or the pin terminal 20, and the pin terminal Mechanical stress is applied to the electrical connection between the lamp socket 12 and the lamp socket 12 and the soldered portion of the pin terminal 20, which significantly reduces the reliability of the electrical connection. In particular, when stress is applied to the soldered portion of the pin terminal 20, the copper foil on the printed circuit board 1 may be cut or peeled off, or a solder crack may occur, which has been a serious problem. Furthermore, since the lighting equipment is used near the ceiling or used outdoors, the temperature change is extremely remarkable. For example, the low temperature side is -10 to 0 ° C when not energized, and the high temperature side is when energized (lighted). 85-
It is required that the performance of the inverter lighting device 5 be maintained at an ambient temperature of 90 ° C. In this case, paper phenol (coefficient of thermal expansion: 2.1 × 10 ⁻⁵ / ° C.) was used as a printed circuit board material, and PBT resin (coefficient of thermal expansion: 9.4 ×) was used as a lamp socket material.
10 ⁻⁵ / ° C.) and when the length of the connection portion at −10 ° C. is L, ΔL = (9.4 ° C.) for a temperature change of ΔT = + 90 ° C .− (10 ° C.) = 100 ° C. × 10 ^-5 -2.1 × 1
0 ^-5) will be caused dimensional changes × ΔT × L = 7.3 × 10 -3 × L (mm), such dimensional change becomes mechanical stress, thereby decreasing the electrical reliability .

[0006] The above-mentioned adverse effects due to mechanical stress also occur in the connector structure of the round fluorescent lamp 10A. That is, since the resin housing 30 of the connector 7 shown in FIGS. 10A and 10B is integrally fixed to the printed circuit board 1, the resin housing 30 and the printed circuit board 1 are fixed.
Due to the difference in the coefficient of thermal expansion or coefficient of thermal contraction of the printed circuit board 1, the direction perpendicular to the direction of connection with the housing 30 (FIG.
A pressing force (or tensile force) acts on 0 (b) as indicated by arrow A). For this reason, mechanical stress is generated between the housing 30 and the printed circuit board 1 or in the soldered portion 21 of the contact 31, which may cause copper foil breakage, solder cracks, and the like, thereby deteriorating the reliability of electrical connection. I was letting it.

The present invention has been made in view of the above problems, and has as its object to provide a method in which a lamp socket, a pin terminal, and a printed circuit board have a dimensional difference due to a difference in thermal expansion coefficient or thermal contraction coefficient. Even so, it is possible to minimize the occurrence of mechanical stress in the electrical connection between the lamp socket and the pin terminal, the soldered portion of the pin terminal, and the like.
It is an object of the present invention to provide a lighting device which is small in size and excellent in assemblability while ensuring the reliability of electrical connection.

[0008]

Means for Solving the Problems The invention according to claim 1 is:
Inside the appliance body, a printed circuit board on which the discharge lamp lighting device is mounted, and a lamp socket electrically connected to the discharge lamp lighting device are housed, and the printed circuit board is
A power supply pin terminal group that is provided upright on the substrate and electrically connected to the discharge lamp lighting device; the lamp socket includes a socket portion to which the discharge lamp is detachable; and the pin terminal group. A terminal connecting portion having a receiving terminal group which is detachably connected to and holds each pin terminal so as to be displaceable in its insertion direction and its cross direction, and a fixing portion fixed to one of the device main body or the printed circuit board. It is provided with.

According to a second aspect of the present invention, the receiving terminal is made of a spring material, and the pin terminal is made of a material having a higher hardness than the receiving terminal.

[0010]

According to the first aspect of the present invention, a power supply pin terminal group electrically connected to the discharge lamp lighting device is erected on a printed circuit board, and individually connected to the pin terminal group in a detachable manner. The receiving terminal of the lamp socket is always in elastic contact with both side surfaces of the pin terminal and holds the pin terminal so as to be displaceable in its insertion direction and its crossing direction. For example, even if a difference occurs between the coefficient of thermal expansion of the lamp socket and the coefficient of thermal expansion of the printed circuit board or the pin terminal, the pin terminal and the receiving terminal relatively move in the direction in which the pin terminal is inserted or in the direction intersecting with the pin terminal. There is no possibility that a mechanical stress will occur in the soldered portion and the like. As a result, it is possible to minimize the occurrence of breakage of the copper foil of the printed circuit board and the occurrence of solder cracks, and to improve the reliability of electrical connection between the lamp socket and the pin terminal and between the pin terminal and the printed circuit board.

According to the second aspect of the present invention, since the pin terminal is made of a material having a higher hardness than the material of the receiving terminal, the receiving terminal is moved when the pin terminal and the receiving terminal move relative to each other. There is no danger of the pin terminal getting stuck or an edge rising, and the relative movement between the pin terminal and the receiving terminal becomes smoother. Thereby, there is no possibility that a mechanical stress is generated in a soldered portion or the like of the pin terminal, a solder crack is prevented from being generated, and the reliability of the electrical connection between the pin terminal and the receiving terminal can be improved.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 2, a lighting device including a downlight used in the present embodiment has a cylindrical device body 8.
An octagonal printed board 1 is housed inside (FIG. 6), and an inverter lighting device 5 including a choke 2 and the like is mounted on the printed board 1. This printed circuit board 1
, Two groups of four pin terminals 20 on the left and right corresponding to the receiving terminals 25 (FIG. 1) of the lamp socket 12 are mounted on the mounting surface 1a.
And a group of pin terminals 20 is electrically connected to the inverter lighting device 5. Further, the pin terminals 20 and 2 adjacent to each other on the printed circuit board 1 are arranged.
At a position near 0, a substantially comb-shaped opening 50 is formed. The opening 50 has a fitting hole 50a through which the fixing portion 12c of the lamp socket 12 passes, and the pin terminals 20 and 20.
The fitting hole 5b is formed by a notch hole 50b cut in between.
0a, the fixing portion 12c of the lamp socket 12
As shown in FIG. 1, the instrument body 8 is fixed to the bottom of the instrument body 8 by screws 54. In addition, 55 is a spacer.

The lamp socket 12 has a socket portion 12a to which the single base fluorescent lamp 10B is detachably connected.
And a terminal connecting portion 12b having a group of receiving terminals 25 that are electrically connected to the lamp filament, and a fixing portion 12c fixed to the fixture body 8 side. Each receiving terminal 25 is made of a spring material such as phosphor bronze in this embodiment, and is shown in FIG.
As shown in (b), one side surface 20a of the pin terminal 20
A spring portion 25a that resiliently contacts the plate and a plate-shaped portion 25b that linearly contacts the other side surface 20b of the pin terminal 20 are integrally formed. The spring portion 25a and the plate-like portion 25b hold the pin terminal 20 so as to be displaceable in its insertion direction S and its cross direction R (FIG. 2), and maintain the thermal expansion rate (or thermal shrinkage rate) of the printed circuit board 1. The amount of dimensional displacement due to the difference between the thermal expansion coefficient (thermal shrinkage rate) of the pin terminal 20 and the lamp socket 12 can be sufficiently absorbed. In order to smoothly insert the pin terminal 20 into the receiving terminal 25, a receiving portion 26 is provided below the spring portion 25a, and an arc surface 27 is provided below the plate-like portion 25b.
Are provided respectively.

On the other hand, the pin terminal 20 is made of a material having a higher hardness than the material (phosphor bronze) of the receiving terminal 25, for example, brass (plated with 2 to 4 μ of tin using 1 μ of copper as a base material). The soldering lead 20 c of the pin terminal 20 is connected to the soldering portion 21 on the printed circuit board 1. Although the receiving terminal 25 is constituted by a one-sided spring 25a and a plate-like portion 25b, as shown in FIGS. 4 (a) and 4 (b), the receiving terminal 25 'is formed on both side surfaces 2 of the pin terminal 20.
5a and 5b, the receiving terminal 25 ″ may be a part of the horizontal portion 61 of the L-shaped leaf spring 60, as shown in FIGS. May be formed to form a spring portion 62 and a pin terminal insertion opening 63, and the spring portion 62 is elastically contacted with the pin terminal 20.

In the above configuration, the lamp socket 12 is connected to the group of pin terminals 20 erected on the printed circuit board 1 shown in FIG.
Of the receiving terminals 25 are individually connected, and each receiving terminal 25 holds the pin terminal 20 so as to be displaceable in its insertion direction S and its crossing direction R. When the change is large, for example, even when a dimensional difference occurs between the components 1, 12, and 20, due to a difference between the coefficient of thermal expansion of the lamp socket 12 and the coefficient of thermal expansion of the printed circuit board 1 and the pin terminals 20, for example. 3A, the relative movement between the receiving terminal 20 and the pin terminal 20 occurs in the direction of the arrow A or A ′, and the electrical connection between the lamp socket 12 and the pin terminal 20 or the soldering of the pin terminal 20 is performed. No mechanical stress is generated in the attachment portion 21 or the like. As a result, the occurrence of copper foil breakage, solder cracking, and the like can be prevented, and the reliability of electrical connection is greatly improved. In addition, the direct connection structure between the receiving terminal 12 and the pin terminal 20 eliminates the need for the conventional connection work between the lamp socket and the printed circuit board and the securing of the wiring space for the lead wires, thus facilitating the assembly. In addition, the height of the lamp can be minimized, and the fixture body 8 can be easily made compact.

Further, the pin terminal 20 is connected to the receiving terminal 2.
5 is made of a material (brass) having a hardness higher than that of the spring material (phosphor bronze) of No. 5, so that the receiving terminal 25 is hardly inserted into the pin terminal 20 with respect to the relative movement between the pin terminal 20 and the receiving terminal 25. In addition, there is no possibility that an edge is formed on the pin terminal 20. As a result, as compared with the conventional structure shown in FIG. 9 in which the contact 31 made of a phosphor copper plate is combined with a soft copper wire for electric use or a receiving terminal formed by soldering a twisted wire of this soft copper wire, In the present invention, the relative movement between the pin terminal 20 and the receiving terminal 25 becomes smoother, the stress applied to the soldering portion 21 of the pin terminal 20 and the like can be reduced, and the reliability of the electrical connection is further improved. According to the embodiment, the fixing portion 12c of the lamp socket 12 shown in FIG. 1 is screwed to the fixture main body 8 through the fitting hole 50a of the printed circuit board 1, so that the single base shown by arrows C and D in FIG. Fluorescent lamp 1
No force is exerted on the printed circuit board 1 by the pushing operation and the rotation operation of the OB, so that the electrical connection between the lamp socket 12 and the pin terminal 20 and the soldering portion 21 of the pin terminal 20 are not subjected to mechanical stress. In addition, it can contribute to the improvement of the reliability of the electrical connection. Here, if the rotational force is merely to be blocked, a cutout hole is provided at least in an arbitrary portion of the printed circuit board 1 and the fixing portion 12c of the lamp socket 12 is fitted therein, so that the rotational force is prevented at a glance. Seems to be easily performed, but actually, in order to fit the lamp socket 12 and the printed circuit board 1,
Clearance is required in consideration of the workability and the shrinkage of the printed circuit board 1 and the lamp socket material. As a result, simply providing a cut-out hole at an arbitrary position on the printed circuit board 1 and fitting the printed circuit board 1 into the space requires only the clearance. Causes rattling,
When the lamp is attached or detached, stress is applied to the electrical connection portion and the soldered portion. In particular, the operating temperature is reduced from
It is extremely wide, from 10 ° C to 100 ° C, and it is necessary to consider the difference in shrinkage between the printed circuit board and the lamp socket resin. In other words, paper phenol (coefficient of thermal expansion:
2.1 × 10 ⁻⁵ / ° C.), PBT resin (coefficient of thermal expansion: 9.4 × 10 ⁻⁵ / ° C.) as a lamp socket material, and when the length of the connection portion is L, the clearance that contracts Is at least (9.4 × 10 ⁻⁵ −2.1 × 10 ⁻⁵ ) ×
Only L × (100 + 10) is required.

Therefore, in this embodiment, in order to minimize the clearance (rack) in the rotation direction, as shown in FIG. 7, the length L of the cut hole 50b in the rotation direction B is made as small as possible, and the printing is performed. The fixing portion 12c of the lamp socket 12 is fitted into the fitting hole 50a of the substrate 1. Consideration is also given to the shrinkage caused by the difference in the material of the printed circuit board 1 and the lamp socket 12,
For the insertion of consideration, the clearance L ₁ is provided,
The existence of the clearance L ₁ is extremely effective also for the relative centering at the time of electrical connection between the printed circuit board 1 and the lamp socket 12. In addition, lamp socket 1
2 can be prevented, stress can be prevented from being generated in the soldering portion 21 of the pin terminal 20, and the pin terminal 20 can be prevented.
And the receiving terminal 25 can be easily and reliably fitted.

In addition, adjacent pin terminals 20, 2
By providing the cut-out holes 50b between 0, the insulation between the soldering portions 21 of the pin terminals 20 is enhanced, and the possibility of short-circuit due to the solder bridge is completely eliminated. As a result, the round area of each of the soldering portions 21 and 21 can be increased, and the soldering process can be performed after the automatic soldering so that sufficient soldering can be performed, and the insulation between the adjacent pin terminals 20 can be achieved. There is an advantage that the shortage of the distance can be solved and the heat radiation effect of the soldering portion 21 is enhanced.

In the above embodiment, the lamp socket 12 is fixed to the fixture body 8, but the lamp socket 12 may be fixed to the printed board 1 and the printed board 1 may be fixed to the fixture body 8. .

[0020]

According to the first aspect of the present invention, a printed circuit board on which a lighting device for a discharge lamp is mounted and a lamp socket electrically connected to the lighting device for a discharge lamp are housed in an appliance body. The printed circuit board is provided with a power supply pin terminal group erected on the board and electrically connected to the discharge lamp lighting device, and the lamp socket is a discharge lamp detachable socket. And a terminal connection portion having a receiving terminal group which is detachably connected to the pin terminal group so as to be displaceable in the insertion direction and the cross direction thereof, and one of the device main body and the printed circuit board. The fixing portion is fixed to the terminal, so that, for example, even if a difference occurs between the coefficient of thermal expansion of the lamp socket and the coefficient of thermal expansion of the printed circuit board or the pin terminal, the relative relationship between the pin terminal and the receiving terminal is increased. Movement by ramp Electrical connection between the socket and the pin terminal,
Alternatively, there is no possibility that mechanical stress occurs in the soldered portion of the pin terminal. Accordingly, it is possible to minimize the occurrence of the breakage of the copper foil of the printed circuit board, the occurrence of solder cracks, etc., and the reliability of electrical connection is greatly improved. Furthermore, since the receiving terminal of the lamp socket is directly connected to the pin terminal on the printed circuit board, the connection work becomes much easier than before,
The assemblability is improved and the lighting fixture can be made more compact.

According to the present invention, the receiving terminal is made of a spring material and the pin terminal is made of a material having a higher hardness than the receiving terminal. And the like can be prevented, and the relative movement between the pin terminal and the receiving terminal can be further facilitated. Therefore, there is no possibility that mechanical stress will be generated in the soldered portion of the pin terminal and the like, and the occurrence of solder cracks can be prevented. As a result, the reliability of electrical connection can be further improved.

[Brief description of the drawings]

FIG. 1 is a front view of a main part of a lighting device according to an embodiment of the present invention.

FIG. 2 is a partially exploded perspective view of the lighting device.

FIG. 3A is a partial front view showing a connection state between a receiving terminal and a pin terminal according to the embodiment, and FIG. 3B is a perspective view of the receiving terminal.

FIG. 4A is a partial front view showing a connection state between a receiving terminal and a pin terminal according to another embodiment, and FIG. 4B is a perspective view of the receiving terminal.

FIG. 5A is a partial front view showing a connection state between a receiving terminal and a pin terminal according to still another embodiment, and FIG. 5B is a perspective view of the receiving terminal.

FIG. 6 is a perspective view showing a state in which the single-ended fluorescent lamp is attached to a lamp socket.

FIG. 7 is a sectional view of a connection portion between the pin terminal and the lamp socket according to the first embodiment.

FIG. 8 is a partially exploded perspective view of a lighting apparatus according to a conventional example.

FIG. 9 is a partial cross-sectional view of the lighting fixture of FIG. 8;

FIG. 10A is a perspective view of the vicinity of the connector of FIG. 8,
(B) is a sectional view.

11A and 11B show another conventional example, in which FIG. 11A is a front view of a single-ended fluorescent lamp, and FIG. 11B is a perspective view of a lamp socket.

FIG. 12 is a partially exploded perspective view showing a reference example of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Printed circuit board 5 Lighting device for discharge lamp 8 Fixture body 10B Single base fluorescent lamp 12 Lamp socket 12a Socket part 12b Terminal connection part 12c Fixed part 20 Pin terminal 25 Receiving terminal S Insertion direction R Cross direction

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tadashi Adachi 3-6-1, Shindaka, Yodogawa-ku, Osaka Meiji National Industrial Co., Ltd. (72) Inventor Shigehisa Yoshida 1048 Kadoma, Oji, Kadoma, Osaka Matsushita Electric Works, Ltd. Inside

Claims (2)

(57) [Scope of request for utility model registration] 1. A printed circuit board on which a lighting device for a discharge lamp is mounted and a lamp socket electrically connected to the lighting device for a discharge lamp are housed inside an appliance body, and the printed circuit board is A power supply pin terminal group is provided upright on the substrate and electrically connected to the discharge lamp lighting device,
The lamp socket has a socket portion to which a discharge lamp is detachable, and a receiving terminal group which is detachably connected to the pin terminal group and holds each pin terminal so as to be displaceable in its insertion direction and its cross direction. A lighting device comprising: a terminal connection portion; and a fixing portion fixed to one of the device main body and the printed circuit board. 2. The luminaire according to claim 1, wherein said receiving terminal is made of a spring material, and said pin terminal is made of a material having a higher hardness than said receiving terminal.