JP2583269Y2 - Lighting waterproof structure - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproof structure for a lighting device which is used by being exposed to an external atmosphere.

[0002]

2. Description of the Related Art Hitherto, there has been used a lighting device for displaying, for example, nighttime lighting such as a speedometer or a tachometer mounted on a motorcycle, or a concentrated warning for notifying a driver of a driving state of a vehicle. Since flexible wiring boards having various kinds of electrical components such as instruments and lighting lamps provided in this type of apparatus tend to be complicated, a flexible wiring board having flexibility is used.

In this case, a flexible wiring board is provided on the back surface of an instrument housing having a display panel in an opening and having a mounting hole or a housing for a display such as a centralized warning. A through-hole is provided at a position corresponding to the mounting hole, and a wedge-based lamp socket for holding a lamp for illumination is inserted through the through-hole into the mounting hole from the outside of the housing and fixed by bayonet coupling. The contact portion formed on the socket is electrically connected to the land portion exposed on the flexible wiring board, and the display panel is illuminated from behind. In particular, for a motorcycle, a ship, an agricultural machine or the like which is exposed to the outside atmosphere and is easily transmitted to a conductive portion such as dust or rainwater, the outer surface of the flexible wiring board is usually covered with a protective cover or the like for connection. The department is trying to keep watertight.

[0004]

However, in the waterproof structure using the protective cover, there is a limit in the adhesion between the housing and the protective cover, and a gap is easily formed due to factors such as thermal deformation. There is a weak point that water or the like intrudes from the portion into the connection portion, causing a short circuit or corrosion of the portion to cause the lamp not to light. Therefore, as shown in, for example, Japanese Utility Model Laid-Open No. 55188/1982, it is conceivable to mount the lamp socket via rubber packing. According to this, it is possible to prevent invasion of water and the like from the outside of the flexible wiring board and the outside of the lamp socket,
It was not possible to prevent anything that penetrated from the joint surface between the housing and the flexible wiring board by capillary action and reached the connection portion via the mounting hole.

The present invention has been made in view of such a problem, and an object of the present invention is to prevent water entering by a capillary phenomenon or the like from coming into contact with a contact formed on a lamp socket and a land formed on a flexible printed circuit board. An object of the present invention is to provide a waterproof structure of a lighting device capable of preventing conduction failure such as a short circuit and maintaining stability of conduction without leading to an electrical connection with the lighting device.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a flexible wiring board having a through hole corresponding to the mounting hole and disposed along the back surface of the housing, A land portion exposed at the periphery of the through hole of the substrate, and a contact portion that holds the lamp and supplies power to the lamp by contact with the land portion, and from the outside of the housing through the through hole of the wiring board; A lamp socket inserted into and fixed to the mounting hole, a positioning flange formed on the outer periphery of the lamp socket and abutting the housing in a watertight manner via the wiring board, and the housing surrounding the mounting hole. A step formed in at least a region of the outer wall surface including a connection between the land and the contact, and formed between the step and the wiring board. Those having a space portion.

In the above structure, a hole communicating the space and the outside is formed in the wiring board.

[0008]

According to the present invention, water entering from the joint surface between the housing and the flexible wiring board is retained by the space formed between the housing and the wiring board, and the space communicates with the outside. The hole formed in the wiring board is discharged to the outside, and the transfer to the connection part is prevented.

【Example】

FIGS. 1 to 3 show a first embodiment in which the lighting device according to the present invention is applied to an instrument unit of an motorcycle.

In FIG. 1, reference numeral 1 denotes an instrument housing. Inside the instrument housing 1, a display housing 3 formed by a partition wall 2 and formed into a tubular shape is integrally formed. Reference numeral 4 denotes a display panel provided at an opening of the instrument housing 1 and the display unit housing 3. The instrument body 6 is fixed to the display panel 4 via a light guide 5, and an indication of the instrument body 6 is provided. A light-transmitting display unit 8 such as a numeral, a scale, and an index (not shown) is provided at a position corresponding to the unit 7, and a driving information and the like of the vehicle is notified to a driver at a position corresponding to the display housing 3. A light-transmitting display section 9 for figures, characters, etc. (not shown) is formed. Reference numeral 10 denotes a transparent cover that covers the front side of the display panel 4. The transparent cover 10 is fixed to the opening side of the instrument housing 1 through a packing 11 in a watertight manner.

Reference numeral 12 is formed in the bottom wall of each of the housings 1 and 3 and has a through hole 14 corresponding to a mounting hole 13 for mounting a lamp to be described later. A land portion 15 electrically connected to the lamp is formed on the periphery of the through hole 14 of the wiring board 12 so as to be exposed. An electrically conductive path 16 is provided (see FIG. 3), and the electrically conductive path 16 is connected to an electric cord wired from a battery (not shown) via a coupler or the like.

Reference numeral 17 denotes a synthetic resin or the like which holds the lamps 18 for transmitting illumination of the display portions 8 and 9 or for illuminating the lighting by transmission, and is inserted into and fixed to the mounting holes 13 of the housings 1 and 3. This is a wedge-based lamp socket.
A fixing portion 20 that is bayonet-bonded to 19; and a flange portion 21 for positioning the lamp socket 17 on each housing 1 and 3 by abutting the bottom wall outer surface of each housing 1 and 3 via the wiring board 12; Also, inside the lamp socket 17, a connection portion 22 is formed in contact with the land portion 15 of the wiring board 12, and a relay terminal 24 having a contact portion 23 for supplying power to the lamp 18 by the connection portion 22 is provided. The relay terminal 24 is electrically connected to the lamp 18 (see FIG. 2).

Reference numeral 25 denotes an annular packing which is located outside the connecting portion 22 and is clamped and fixed between the flange portion 21 and the bottom wall portions of the housings 1 and 3 by the bayonet connection.
In this case, a step 26 is formed on the outer surface of the bottom wall of the housings 1 and 3 around the periphery of the mounting hole 13 so as to protrude outward, and the wiring board 12 is interposed between the end face of the step 26 and the flange 21 via the wiring board 12. An annular packing 25 is sandwiched between the stepped portions 26.
The water which invades by capillary action from between each of the housings 1 and 3 and the wiring board 12 at the step portion 26 side outer wall portion and the wiring board 12 to the connection part 22 through the through hole 14. Is formed to prevent the transition of the space.

When the lamp socket 17 is made of an elastic material such as rubber, the annular packing 25 need not be provided.

As described above in detail, according to this embodiment, since the space S is formed between the step 26 of each of the housings 1 and 3 and the wiring board 12, each of the housings 1, 3 Water that has entered between the wiring board 12 and the
Was retained in the space portion S, to prevent the transition to the connecting portion 22 by the step portion 26 can be kept watertight connection 22, thereby avoiding a poor conduction.

FIG. 4 shows a second embodiment of the present invention.
In this embodiment , the connection portion 22 between the land portion 15 and the contact portion 23
Are also provided on the outer surfaces of the bottom walls of the housings 1 and 3 located outside.
By providing the groove 27, a claw positioned on the connection portion 22 side is formed.
A step 26 is formed on the outer surface of the bottom wall of the housings 1, 3.
In addition , a space S is formed between the step portion 26 formed by the annular groove portion 27 and the wiring board 12, and the other portions are substantially the same as those in the first embodiment, so that they are the same. Are denoted by the same reference numerals, and detailed description is omitted.

According to the present embodiment, in addition to the first embodiment and substantially the same effect can be obtained, increase the retention effect of the water by the annular groove 27, to maintain the watertight connection portion 22 to prevent the migration Thus, poor conduction can be prevented. What
In this embodiment, a step 26 formed by the annular groove 27 is used.
Was formed to be thicker than the other parts.
The thickness dimension of the portion 26 can form the annular groove portion 27
As long as it is the same as the other parts. The width of the annular groove 27
Dimensions are set appropriately if water retention effect can be obtained
Is possible.

FIG. 5 shows a third embodiment of the present invention.
In this embodiment, the outer wall portion you located outward from the connecting portion 22
Setting the step portion 26 by forming a multiple annular grooves 27 in the
A plurality of spaces S are provided between the annular groove 27 and the wiring board 12, and the other parts are substantially the same as those of the first and second embodiments, so that the detailed description will be omitted.

According to this embodiment, substantially the same effects as those of the first and second embodiments can be obtained.
The stagnation effect of the water is further enhanced,
Can be kept watertight, thereby preventing poor conduction.

FIG. 6 shows a fourth embodiment of the present invention.
In the present embodiment, a step portion 28 is provided by providing an annular groove 27 on the outer wall portion of each of the housings 1 and 3 located outside the connecting portion 22, and a space S is provided between the annular groove 27 and the wiring board 12. Is formed, and the wiring board 12 corresponding to the space S is formed.
Is formed with a drain hole 29 for communicating the space portion S with the outside, and the other portions are substantially the same as those in the first, second, and third embodiments, and a detailed description thereof will be omitted.

According to the present embodiment, the first, second, third
In addition to obtaining substantially the same effect as the embodiment,
Water can be discharged to the outside, and the watertightness of the connection portion 22 can be more reliably ensured.

[0022]

As described above, according to the present invention, the mounting holes formed in the housing and the through holes corresponding to the mounting holes are provided.
A flexible wiring board having a hole , disposed along the back surface of the housing, a land portion exposed at the periphery of a through hole of the wiring board, and a lamp holding the lamp and contacting the land with the land. A lamp socket which is provided on the outer periphery of the lamp socket and is fixed to the housing through a through hole of the wiring board from outside of the housing; A positioning flange portion that contacts water-tightly through a substrate, and a step portion formed in a region including a connection portion between at least the land portion and the contact portion on the outer wall surface of the housing surrounding the mounting hole, Since it has a space formed between the step and the wiring board, water entering from the joint surface between the housing and the flexible wiring board can be prevented. Provided is a waterproof structure of a lighting device which can be retained by a space formed between a ring and a wiring board and can be prevented from shifting to a connection part, thereby maintaining watertightness of the connection part. Can be.

In the above structure, since the hole for communicating the space and the outside is formed in the wiring board, water entering from the joint surface between the housing and the flexible wiring board is prevented from flowing between the housing and the wiring board. The waterproof structure of the lighting device can be provided which can temporarily stay in the formed space portion and be discharged to the outside, thereby maintaining the watertightness of the connection portion.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention.

FIG. 2 is a sectional view of a main part of FIG.

FIG. 3 is a perspective view of a main part of FIG. 1;

FIG. 4 is a sectional view of a main part of a second embodiment of the present invention.

FIG. 5 is a sectional view of a main part of a third embodiment of the present invention.

FIG. 6 is a sectional view of a main part of a fourth embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Instrument housing 3 Display housing 12 Flexible wiring board 13 Mounting hole 14 Device 15 Land 17 Lamp socket 18 Lamp 21 Flange 22 Connection 23 Contact 26, 28 Step 27 Annular groove 29 Drain hole S Space

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F21V 31/00 F21Q 1/00

Claims (3)

(57) [Scope of request for utility model registration] 1. A flexible wiring board having a mounting hole formed in a housing, a through- hole corresponding to the mounting hole , and disposed along a back surface of the housing, and a peripheral portion of the through-hole of the wiring board. An exposed land portion, and a contact portion for holding the lamp and supplying power to the lamp by contact with the land portion, and inserted into the mounting hole from the outside of the housing via a through hole of the wiring board. A lamp socket to be fixed, a positioning flange formed on an outer periphery of the lamp socket and abutting on the housing through the wiring board in a watertight manner, and at least an outer wall surface of the housing surrounding the mounting hole. A step portion formed in a region including a connection portion between the land portion and the contact portion; and a space portion formed between the step portion and the wiring board. A waterproof structure for a lighting device. 2. The waterproof structure for a lighting device according to claim 1, wherein a step portion forming the space portion is formed by a groove. 3. The waterproof structure of a lighting device according to claim 1, wherein a hole communicating the space and the outside is formed in the wiring board.