Illumination lamp

Abstract

To provide an illumination lamp the entire length of which can be reduced.SOLUTION: An illumination lamp 1 includes: a substrate 5 on which a light source is mounted; a bus bar 4; a housing 3 to which the substrate 5 and the bus bar 4 are fitted; and a cover 2 fitted to the housing 3 and covering the substrate 5. In the illumination lamp 1, the substrate 5 is placed to overlap a lower surface of a hood portion 30 of the housing 3 and a lower surface of a bus-bar accommodation portion 31, and a front half portion of the substrate 5 and a first connection portion 40 of the bus bar 4 are arranged in a fitting intersectional direction that intersects with a direction in which a mating connector 12 is fitted to the hood portion 30. A rear half portion of the substrate 5 and a second connection portion 42 of the bus bar 4 are arranged in the fitting intersectional direction.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a lighting fixture. [Background technology]

[0002] Fig. 12 is a cross-sectional view of a conventional illuminating lamp disclosed in Patent Document 1. As shown in Fig. 12, illuminating lamp 500 includes housing 501, bus bar 520, circuit board 530 on which light-emitting diode 531 serving as a light source is mounted, lens 535, and lens cover 540.

[0003] The housing 501 has a connector fitting chamber 503 into which a mating connector connected to a power source is fitted, and a component receiving chamber 502 provided behind the connector fitting chamber 503 .

[0004] Bus bar 520 has tab terminal portion 525 arranged in connector fitting chamber 503 , and fixed contact portion 522 and spring contact portion 523 arranged in component-receiving chamber 502 .

[0005] The circuit board 530 is disposed in the component housing chamber 502 and is sandwiched between the fixed contact portion 522 and the spring contact portion 523 to be electrically connected to the bus bar 520 .

[0006] The lens 535 is disposed above the light-emitting diode 531 in the component-receiving chamber 502 .

[0007] The lens cover 540 closes the opening of the housing 501. The lens cover 540 also restricts the movement of the lens 535 and the circuit board 530.

[0008] In such an illumination lamp 500, power is supplied from a power source to a circuit board 530 via a mating connector and a bus bar 520, causing a light-emitting diode 531 to emit light. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Publication No. 2020-13674 Summary of the Invention [Problem to be solved by the invention]

[0010] In the conventional illuminating lamp 500 described above, the circuit board 530 is disposed in the component receiving chamber 502 provided behind the connector fitting chamber 503, which causes a problem that the overall length of the lamp is long.

[0011] SUMMARY OF THE INVENTION It is therefore an object of the present invention to provide an illumination lamp whose overall length can be shortened. [Means for solving the problem]

[0012] The present invention provides an illumination lamp comprising: a board on which a light source is mounted; a bus bar; and a housing to which the board and the bus bar are assembled; the housing has a hood portion into which a mating connector is mated; and a bus bar accommodating portion provided behind the hood portion; the bus bar has a first connecting portion disposed in the hood portion and connected to the mating connector; and a second connecting portion disposed in the bus bar accommodating portion and connected to the board; the board is overlaid on the outer surface of the hood portion; the front half of the board and the first connecting portion are aligned in a mating cross direction that intersects the mating direction of the mating connector into the hood portion; and the rear half of the board and the second connecting portion are aligned in the mating cross direction. [Effects of the Invention]

[0013] According to the present invention, the overall length of the lighting fixture can be shortened. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a diagram illustrating a mounting structure for an illumination lamp according to a first embodiment of the present invention. [Figure 2]FIG. 2 is a perspective view of the lamp of FIG. 1 turned upside down. [Figure 3] FIG. 3 is an exploded view of the lamp of FIG. 2. [Figure 4] FIG. 2 is a plan view of the lamp of FIG. 1. [Figure 5] FIG. 5 is a cross-sectional view taken along line AA in FIG. [Figure 6] FIG. 4 is a perspective view of the substrate of FIG. 3 turned upside down. [Figure 7] FIG. 6 is an enlarged view of part C in FIG. [Figure 8] FIG. 5 is a cross-sectional view taken along line BB in FIG. [Figure 9] FIG. 10 is a perspective view of an illumination lamp according to a second embodiment of the present invention with the cover removed. [Figure 10] FIG. 10 is a cross-sectional view of the illumination lamp of FIG. 9 with the cover attached. [Figure 11] FIG. 10 is a cross-sectional view of an illumination lamp according to a third embodiment of the present invention. [Figure 12] FIG. 1 is a cross-sectional view of a conventional lighting fixture. DETAILED DESCRIPTION OF THE INVENTION

[0015] An "illumination lamp" according to a first embodiment of the present invention will be described with reference to FIGS.

[0016] As shown in FIG. 1, the lamp 1 of this example is attached to the trim 13 of an automobile. The trim 13 may be, for example, a roof trim, a door trim, or a luggage trim. The lamp 1 is attached to the trim 13 by being pushed into an opening 13a formed in the trim 13. After the lamp 1 is attached to the trim 13, a mating connector 12 connected to the automobile's power supply is fitted into the lamp 1, and power is supplied from the vehicle side. The lighting of the lamp 1 is controlled on the vehicle side.

[0017] As shown in Figures 2 to 5 and 8, the lighting lamp 1 comprises a substrate 5 on which a light source is mounted, two bus bars 4, a housing 3 in which the substrate 5 and bus bars 4 are assembled, and a cover 2 assembled to the housing 3 and covering the substrate 5.

[0018] In this specification, the side of the illuminating lamp 1 that mates with the mating connector 12 will be referred to as the "front," and the side opposite to the side that mates with the mating connector 12 will be referred to as the "rear." Additionally, the side of the plate portion 21 of the cover 2 will be referred to as the "bottom," and the side of the housing 3 opposite to the side to which the cover 2 is attached will be referred to as the "top." These terms are used for the convenience of explaining the configuration of the illuminating lamp 1, and do not necessarily have to match the directions in the location where it is actually used.

[0019] The substrate 5 is a printed circuit board in which wiring patterns are formed on both sides of a substrate main body 50 formed in the shape of a rectangular plate from an insulating material. As shown in Fig. 3, one surface 50a of the substrate main body 50 is mounted with an illumination LED (Light Emitting Diode, equivalent to a "light source") 54 and electronic components 52 and 53 for causing the LED 54 to emit light. As shown in Fig. 6, the other surface 50b of the substrate main body 50 is formed with a contact portion 51 with a second connection portion 41 (described later) of the bus bar 4. The contact portion 51 is formed as part of the wiring pattern.

[0020] The two bus bars 4 have the same shape and size. These bus bars 4 are formed by punching a conductive metal plate into the shape shown in Fig. 3. Each bus bar 4 has a first connection portion 40, an intermediate portion 41, and a second connection portion 42.

[0021] The first connecting portion 40 is formed in a rod shape. The first connecting portion 40 is disposed in a hood portion 30 (described later) of the housing 3 and connected to the mating connector 12. The intermediate portion 41 is a portion connecting the first connecting portion 40 and the second connecting portion 42. The intermediate portion 41 extends in a plate shape from the rear end of the first connecting portion 40 to the side opposite the first connecting portion 40. The second connecting portion 42 extends in a cantilever shape from the rear end of the intermediate portion 41 to the front end and has spring properties. A free end 42a of the second connecting portion 42 is in elastic contact with a contact portion 51 of the circuit board 5. The intermediate portion 41 and the second connecting portion 42 are disposed in a busbar accommodating portion 31 (described later) of the housing 3.

[0022] The housing 3 is made of an opaque synthetic resin and integrally includes a hood portion 30 into which the mating connector 12 is fitted, a bus bar accommodating portion 31 provided behind the hood portion 30, and board positioning portions 33 and 35 that position the board 5.

[0023] The hood portion 30 is formed in a box shape capable of receiving the mating connector 12 and is open to the front. The first connection portions 40 of the two bus bars 4 are arranged inside the hood portion 30. As shown in FIG. 5 , a through hole 30h is formed in the back wall of the hood portion 30 to allow the first connection portions 40 to pass through from the bus bar accommodating portion 31 side.

[0024] Busbar accommodating portion 31 has a block-like outer shape that is continuous with the back wall of hood portion 30. Busbar accommodating portion 31 is formed with two slits 34 that accommodate two busbars 4, respectively.

[0025] Each slit 34 extends in the front-to-rear direction and is open in two directions, on the lower surface and the rear surface of the busbar accommodating portion 31. The opening on the rear surface of the slit 34 is for inserting the busbar 4 (passing it through when assembling it to the housing 3). The opening on the lower surface of the slit 34 is for allowing the free end 42a of the second connection portion 42 to protrude outside the busbar accommodating portion 31. That is, when the second connection portion 42 is not in contact with the board 5, the free end 42a protrudes outside the busbar accommodating portion 31, as shown by the dashed-dotted line in FIG. 7. When connected to the board 5, the second connection portion 42 is pressed by the board 5 and elastically deformed toward the intermediate portion 41, as shown by the solid line in FIG.

[0026] In addition, locking projections 32 (see FIGS. 2 and 3) that lock with the cover 2 are provided on both side surfaces of the busbar accommodating portion 31. In addition to this, locking projections 33a (see FIG. 5) that lock with the cover 2 are also provided on the board positioning portion 33.

[0027] As shown in Fig. 5, board positioning portion 33 is disposed along the short side of board main body 50. As shown in Fig. 3, board positioning portion 33 is formed in the shape of a wall hanging down from the lower surface of hood portion 30 (the surface located on the lower side of the outer surface of hood portion 30). The locking protrusion 33a is provided on the surface of board positioning portion 33 opposite to board 5.

[0028] A pair of board positioning portions 35 are provided as shown in Fig. 3. Each board positioning portion 35 has a first wall 35a hanging down from the underside of the hood portion 30 and a second wall 35b continuing perpendicularly to the first wall 35a. The pair of board positioning portions 35 extend in the front-to-rear direction of the housing 3, with one end continuing to the board positioning portion 33. The first wall 35a extends along the long side of the board main body 50, and the second wall 35b extends along one surface 50a of the board main body 50.

[0029] The board 5 is slidably inserted between the pair of board positioning portions 35, and is placed on the lower surfaces of the hood portion 30 and the busbar accommodating portion 31 with its short sides abutting against the board positioning portions 33. The other surface 50b of the board 5 is placed on the lower surfaces of the hood portion 30 and the busbar accommodating portion 31.

[0030] With the substrate 5 assembled to the housing 3 in this manner, the front half of the substrate 5 and the first connecting portion 40 are aligned in a mating cross direction that intersects with the mating direction of the hood portion 30 of the mating connector 12. The rear half of the substrate 5 and the second connecting portion 42 are aligned in the mating cross direction. Furthermore, the free end 42a of the second connecting portion 42 protruding from the slit 34 to the outside of the busbar accommodating portion 31 is in elastic contact with the contact portion 51.

[0031] The cover 2 is made of a translucent synthetic resin and integrally includes a plate portion 21 facing the substrate 5, housing locking portions 22 and 23, a pressing portion 24, a locking plate portion 25, a locking claw 26, and a housing abutment portion 27.

[0032] The plate portion 21 is a portion that transmits light from the LED 54 to the vehicle interior side. The plate portion 21 is subjected to a lens cut as a light diffusion treatment.

[0033] The housing locking portion 22 is a portion that locks onto the locking projection 32 of the housing 3. The housing locking portion 22 is formed in a plate shape that is connected perpendicularly to the plate portion 21, and has a locking hole 22a that locks onto the locking projection 32. A pair of the housing locking portions 22 is provided.

[0034] 5, the housing locking portion 23 is a portion that locks onto the locking projection 33a of the housing 3. The housing locking portion 23 is formed in a plate shape that is connected perpendicularly to the plate portion 21, and has a locking hole 23a that locks onto the locking projection 33a.

[0035] The retaining portion 24 is a portion that fits along the rear surface of the housing 3 and prevents the bus bar 4 and the substrate 5 from falling off the housing 3. The retaining portion 24 is formed in a plate shape that is connected to the plate portion 21 perpendicularly.

[0036] The locking plate portion 25 and the locking claw 26 are portions that lock onto the edge of the opening 13a of the trim 13. The locking plate portion 25 is formed in the shape of a plate that is connected perpendicularly to the plate portion 21. The locking claw 26 protrudes from the locking plate portion 25 and sandwiches the edge of the trim 13 between the locking plate portion 25 and the plate portion 21. A pair of the locking claws 26 is provided.

[0037] The housing abutment portion 27 is a portion that abuts against the front portion of the lower surface of the hood portion 30.

[0038] In this way, in the illuminating lamp 1, the substrate 5 is overlapped on the underside of the hood portion 30 and the underside of the busbar accommodating portion 31, and the front half of the substrate 5 and the first connecting portion 40 are aligned in a mating cross direction that intersects with the mating direction of the mating connector 12 to the hood portion 30. The rear half of the substrate 5 and the second connecting portion 42 are aligned in the mating cross direction. With this configuration, the overall length of the illuminating lamp 1 can be significantly reduced and it can be made more compact than a conventional illuminating lamp 500 (see FIG. 12). Furthermore, each component of the illuminating lamp 1 is also made smaller, which also leads to a reduction in manufacturing costs.

[0039] An "illumination lamp" according to a second embodiment of the present invention will be described with reference to Figures 9 and 10. In Figures 9 and 10, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted.

[0040] 9 and 10 includes a substrate 105 on which two LEDs 54 are mounted. Other than this, the illuminating lamp 101 has the same configuration as the illuminating lamp 1 of the first embodiment.

[0041] Conventional lighting fixture 500 (see FIG. 12) has a structure in which spring contact portion 523 of bus bar 520 contacts the surface on which light-emitting diode 531 is mounted of circuit board 530. This limits the area in which the light source can be laid out, and reduces the degree of freedom in how the light is emitted.

[0042] In contrast to this, the lighting lamp 1 of the first embodiment and the lighting lamp 101 of this example are laid out so that the boards 5, 105 are stacked on the underside of the hood portion 30, and thus the contact portions 51 with the busbar 4 are located on the back surface 50b of the LED mounting surface 50a. This increases the space (shown by the dashed dotted line S in FIG. 9) in which the LEDs 54 can be laid out, making it possible to mount multiple LEDs 54 as in this example.

[0043] An "illumination lamp" according to a third embodiment of the present invention will be described with reference to Fig. 11. In Fig. 11, the same components as those in the first embodiment described above are denoted by the same reference numerals, and the description thereof will be omitted.

[0044] 11 includes a substrate 205 on which LEDs 55 are mounted that emit light backward, the emission direction of which is different from that of the LEDs 54 of the first and second embodiments, and a corresponding cover 202. Other than this, the configuration is the same as that of the illumination lamp 1 of the first embodiment.

[0045] The illuminating lamp 201 of this example has a structure that allows a high degree of freedom in the layout of LEDs on the substrate 205, similar to the illuminating lamps 1 and 101 of the first and second embodiments, and therefore it is possible to lay out the vertical illumination type LEDs 55 in this way.

[0046] The illuminating lamps 1, 101, 201 of the first to third embodiments described above are extremely small in product size and have a structure with a high degree of freedom in the layout of LEDs, so that they can be adapted to any purpose simply by replacing the cover or board.

[0047] In the first to third embodiments described above, the illumination lamp is attached to the trim of an automobile, but the "illumination lamp" of the present invention can also be attached to machines, devices, structures, etc. other than automobiles.

[0048] The above-described embodiment merely shows a typical form of the present invention, and the present invention is not limited to this embodiment. In other words, the present invention can be implemented with various modifications within the scope of the gist of the present invention. As long as such modifications still include the configuration of the present invention, they are of course included in the scope of the present invention. [Explanation of symbols]

[0049] 1,101,201 lighting fixtures 2,202 covers 3. Housing 4 Busbars 5,105,205 boards 12 Mating connector 30 Hood Section 31 Busbar receiving section 40 First connection part 42 Second connection part

Claims

1. a substrate on which a light source is mounted, a bus bar, and a housing to which the substrate and the bus bar are assembled, the housing has a hood portion into which a mating connector is fitted, and a bus bar accommodating portion provided behind the hood portion, the bus bar has a first connection portion disposed in the hood portion and connected to the mating connector, and a second connection portion disposed in the bus bar accommodating portion and connected to the board, the substrate is overlaid on an outer surface of the hood portion, the front half of the board and the first connection portion are aligned in a mating cross direction that crosses a mating direction of the mating connector to the hood portion, The rear half of the substrate and the second connection portion are aligned in the intersecting fitting direction. A lighting fixture characterized by:

2. the light source is mounted on one surface of the substrate, and a contact portion with the second connection portion is formed on the other surface; the other surface of the substrate is superimposed on an outer surface of the hood portion, A slit is formed in the bus bar accommodating portion, and a part of the second connecting portion protruding from the slit to the outside of the bus bar accommodating portion is in elastic contact with the contact portion.

2. The lighting fixture according to claim 1.

3. the bus bar has an intermediate portion connecting the first connection portion and the second connection portion, the intermediate portion extends from a rear end of the first connection portion to a side opposite the first connection portion, the second connection portion extends in a cantilevered manner from the rear end of the intermediate portion toward the front end, The free end of the second connection portion is in elastic contact with the contact portion.

3. The lighting fixture according to claim 2.

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