JP7424278B2 - lighting equipment - Google Patents

Description

The present invention relates to a lighting device.

Conventionally, an indoor lighting lamp has been known that includes a housing that is attached to the ceiling, a lens cover that is provided below the housing, a board that has a light source that is provided above the housing, and a board cover that covers the board. (For example, see Patent Document 1).

In the indoor lighting lamp described in Patent Document 1, the board cover is attached to the housing by fitting the claws of the housing into the holes in the board cover.

JP2018-192881A

However, in the indoor lighting lamp described in Patent Document 1, since the board cover has a hole, a slide mold for forming the hole is required in the mold for injection molding the board cover. Manufacturing costs are increasing.

An object of the present invention is to provide a lighting device that can be injection molded without using a slide mold and includes a substrate cover that has a fitting hole for fitting a claw of a housing.

In order to achieve the above object, one aspect of the present invention provides the following lighting devices [1] to [3].

[1] A board cover having a bottom wall and a side wall continuous with the bottom wall and having a fitting hole, a housing having a claw that fits into the fitting hole, and a housing that fits the claw into the fitting hole. A board on which a light emitting element is mounted on a wiring board, which is fixed between the bottom wall of the board cover and the housing by fitting together, and a lens that is attached to the housing and serves as a light emitting surface. , the side wall has a stepped portion that provides a step between a first portion on the front end side and a second portion on the bottom wall side, and at least a portion of the fitting hole is connected to the first portion on the bottom wall side. a notch that opens at the edge of the stepped portion side of the portion and allows the mold to be removed from the bottom wall side, and is located at a higher position than the side surface of the wiring board with respect to the bottom wall; lighting equipment.
[2] The lighting device according to [1], wherein all of the fitting holes are formed by cutouts on the bottom wall side through which a mold can be removed.
[3] The lighting device according to [1] or [2] above, wherein the distance from the fitting hole to all exposed conductive parts of the substrate is 5 mm or more.

According to the present invention, it is possible to provide a lighting device that can be injection molded without using a slide mold and includes a substrate cover that has a fitting hole for fitting a claw of a housing.

FIGS. 1A and 1B are perspective views of a lighting device according to an embodiment of the present invention. FIG. 2 is an exploded perspective view of the lighting device according to the embodiment of the invention. FIG. 3A is an enlarged side view of the lighting device, showing the vicinity of the fitting hole of the board cover. FIG. 3(b) is a vertical cross-sectional view of the lighting device taken along cutting line AA in FIG. 3(a). FIG. 4(a) is a schematic cross-sectional view schematically showing the characteristics of the substrate cover according to the embodiment of the present invention. FIGS. 4(b) and 4(c) are schematic cross-sectional views schematically showing the characteristics of a conventional board cover as a comparative example. FIGS. 5A and 5B are schematic cross-sectional views showing a process of injection molding a substrate cover according to an embodiment of the present invention. FIGS. 6A and 6B are schematic cross-sectional views showing a process of injection molding a substrate cover according to a comparative example.

[Embodiment]
(Configuration of lighting device)
FIGS. 1A and 1B are perspective views of a lighting device 1 according to an embodiment of the present invention. FIG. 1(a) is a perspective view as seen from the lens 50 side, which will be described later, and FIG. 1(b) is a perspective view as seen from the substrate cover 10 side, which will be described later. FIG. 2 is an exploded perspective view of the lighting device 1.

The lighting device 1 is a lighting device that is attached to the ceiling of a vehicle, and is typically a lighting device that is attached to the ceiling of the rear seat side of the automobile.

The lighting device 1 includes a substrate cover 10 having a bottom wall 11 and a side wall 12 continuous with the bottom wall 11 and having fitting holes 13 (13a to 13c), and a substrate cover 10 that protrudes outward and fits into the fitting holes 13. The housing 20 has a side wall 21 having claws 22 (22a to 22c), and by fitting the claws 22 into the fitting holes 13 from inside the side wall 12, the housing 20 is sandwiched between the bottom wall 11 of the board cover 10 and the housing 20. The housing 20 includes a substrate 30 on which a light-emitting element 32 as a light source and a switch 33 for switching the operation of the light-emitting element 32 are mounted, and a lens 50 as a light-emitting surface attached to the housing 20.

The board 30 includes a wiring board 31 , a light emitting element 32 mounted on the wiring board 31 , a switch 33 , and a power connector 34 for connecting a cable for supplying power to the light emitting element 32 . The light emitting element 32 is, for example, a light emitting diode element. The number and arrangement of the light emitting elements 32 are not particularly limited. The switch 33 is a push button switch that turns on and off the current and turns the light emitting element 32 on and off by pressing the button.

The board cover 10 is a member that covers and protects the board 30, and by attaching the board cover 10 to the housing 20 while covering the board 30, the board 30 can be fixed. The board cover 10 is made of resin such as polypropylene, for example.

The side wall 21 of the housing 20 having the claws 22 and the side wall 12 of the board cover 10 having the fitting holes 13 are elastically deformed when the board cover 10 is attached to the housing 20, and when the claws 22 reach the fitting holes 13. Then, the claw 22 is fitted into the fitting hole 13 by its restoring force. The claws 22a, 22b, and 22c of the housing 20 fit into the fitting holes 13a, 13b, and 13c of the board cover 10, respectively.

The housing 20 has an opening 25 on the side where the substrate 30 is attached for taking in the light emitted from the light emitting element 32. Furthermore, the housing 20 has an opening 26 for emitting light emitted from the light emitting element 32 on the side opposite to the side to which the substrate 30 is attached. The housing 20 is made of, for example, a resin such as polypropylene, and has a property of not transmitting light emitted from the light emitting element 32.

Further, the housing 20 has a clip attachment part 24 for fixing the clip 60. The clip 60 is a component for attaching the lighting device 1 to the ceiling of the vehicle interior, and is elastically deformed when attached, and is fixed to the attachment portion of the ceiling by its restoring force.

Lens 50 is attached to housing 20 so as to cover opening 26 . The lens 50 is made of resin such as polycarbonate, and has a property of transmitting light emitted from the light emitting element 32.

The lighting device 1 also includes a switch knob 40 for operating the switch 33, which is attached to the switch knob attachment part 23 of the housing 20. By pushing the switch knob 40 with a finger or the like, the button of the switch 33 can be pressed to turn the current on or off.

As shown in FIG. 2, the assembly direction of each component constituting the lighting device 1 is unified to one direction, and the lighting device 1 can be easily assembled even when automatic assembly is performed by a robot. .

(Fitting hole structure that does not require a slide mold)
FIG. 3A is an enlarged side view of the lighting device 1, showing the vicinity of the fitting hole 13b of the board cover 10. FIG. 3(b) is a vertical sectional view of the lighting device 1 taken along the cutting line AA in FIG. 3(a).

As shown in FIGS. 2, 3(a) and 3(b), the side wall 12 has a stepped portion 12d that has a step between a first portion 12b on the tip 12a side and a second portion 12c on the bottom wall 11 side. has. The fitting hole 13b is formed by a notch that opens at the edge 12e of the first portion 12b on the step portion 12d side and allows the mold to be removed from the bottom wall 11 side. Further, the second portion 12c of the side wall 21 is located at a position facing the side surface of the wiring board 31 of the board 30, and the fitting hole 13b provided in the first portion 12b is formed on the wiring board 31 with the bottom wall 11 as a reference. located higher than the sides of the

The first portion 12b is located outside the second portion 12c. That is, the distance from the bottom wall 11 in the in-plane direction of the bottom wall 11 is larger than the second portion 12c. Then, when attaching the board cover 10 to the housing 20, the side wall 21 enters inside the side wall 12, and the claw 22 fits into the fitting hole 13 from inside the side wall 12.

FIG. 4(a) is a schematic cross-sectional view schematically showing the characteristics of the board cover 10 according to the embodiment of the present invention. FIGS. 4(b) and 4(c) are schematic cross-sectional views schematically showing the characteristics of substrate covers 100a and 100b as comparative examples.

The fitting hole 130a provided in the side wall 120 of the substrate cover 100a shown in FIG. 4(b) does not have a shape that allows the mold to be removed from the bottom wall 110 side. Therefore, a slide mold for forming the fitting hole 130a is required in the mold for injection molding the substrate cover 100a.

FIGS. 5A and 5B are schematic cross-sectional views showing a process of injection molding the substrate cover 10 according to the embodiment of the present invention. FIG. 5(a) shows a state in which the board cover 10 is molded by injecting resin into a mold, and FIG. 5(b) shows the process of removing the mold from the molded board cover 10. As shown in FIGS. 5A and 5B, the fitting hole 13b can be formed using only the molds 70a and 70b that are cut in the vertical direction in the figure, without using a slide fitting. Therefore, manufacturing costs can be reduced.

FIGS. 6A and 6B are schematic cross-sectional views showing a process of injection molding a substrate cover 100a according to a comparative example. FIG. 6(a) shows a state in which the board cover 100a is molded by injecting resin into a mold, and FIG. 6(b) shows the process of removing the mold from the molded board cover 100a. As shown in FIGS. 6(a) and 6(b), in order to form the fitting hole 130a, not only molds 71a and 71b that are drawn in the vertical direction in the figure, but also a slide mold 71c that is drawn in the horizontal direction are used. Needed.

The fitting hole 130b of the board cover 100b shown in FIG. 4(c) is configured with a notch that opens at the edge 120a of the side wall 120 on the bottom wall 110 side, and has a shape that allows the mold to be pulled out on the bottom wall 110 side. has. However, since the side wall 120 does not have a step, a part of the fitting hole 130b is at the same height as the side surface of the wiring board 31 of the board 30, and the side surface of the wiring board 31 is inserted into the board cover through the fitting hole 130b. Exposed to the outside of 100b.

For this reason, for example, when a worker holds the board cover 100b attached to the lighting device, his or her fingers may come into contact with the wiring board 31 or come close enough to the wiring board 31, causing electrostatic discharge that may cause malfunctions in electronic circuits and damage to semiconductor devices. Otherwise, damage may occur. Furthermore, although the lighting device is installed on the ceiling inside the vehicle with the board cover 100b facing upward, since the side surface of the wiring board 31 is exposed to the outside of the board cover 100b through the fitting hole 130b, condensation may When water drips from the substrate 30, there is a risk that the water will adhere to the substrate 30 and cause a short circuit.

Since the fitting hole 13b of the board cover 10 is located at a different height from the wiring board 31 of the board 30, electrostatic discharge can occur even when a worker touches the board cover 10 attached to the lighting device 1. can be suppressed. In addition, since the fitting hole 13b is located below the board 30 when the board cover 10 is attached to the ceiling of the car with the board facing upward, even if water drips from the ceiling due to condensation, water will not Adhesion to the substrate 30 through the matching hole 13b can be suppressed.

Note that it is preferable that all of the fitting holes 13 (fitting holes 13a to 13c) of the substrate cover 10 be formed by cutouts on the bottom wall 11 side through which the mold can be removed. In this case, all the fitting holes 13 can be formed without using a slide mold, so the board cover 10 can be formed using only the two molds 70a and 70b, that is, using a two-way punching mold. It can be injection molded, and the manufacturing cost of the board cover 10 can be further reduced.

Further, in order to more effectively suppress the occurrence of electrostatic discharge, it is preferable that the distance from the fitting hole 13 (13a to 13c) of all exposed conductive parts of the substrate 30 is 5 mm or more. In order to satisfy this condition, methods such as adjusting the arrangement of conductive parts on the wiring board 31 can be taken.

Note that the fitting hole 13a is provided opposite to the mounting position of the power supply connector 34 on the board 30, and is not close to a conductive part of the board 30 (for example, an electrode of a mounted component or an electrode for inspection). Therefore, the fitting hole 13a does not need to be located at a higher position than the side surface of the wiring board 31, and may have a structure like the fitting hole 130b shown in FIG. 4(c), for example.

(Effects of embodiment)
According to the embodiment described above, when injection molding the substrate cover 10 having the fitting holes 13 for fitting the claws 22 of the housing 20, at least some of the fitting holes 13 are formed using a slide mold. It can be molded without any process. Thereby, the manufacturing cost of the lighting device 1 including the board cover 10 can be suppressed.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the gist of the invention. Furthermore, the above embodiments do not limit the claimed invention. Furthermore, it should be noted that not all combinations of features described in the embodiments are essential for solving the problems of the invention.

1 Lighting device 10 Board cover 11 Bottom wall 12 Side wall 12a Tip 12b First portion 12c Second portion 12d Step portion 12e Edge 13 (13a to 13c) Fitting hole 20 Housing 21 Side wall 22 (22a to 22c) Claw 30 Board 31 Wiring board 32 Light emitting element 50 Lens

Claims (3)

a substrate cover having a bottom wall and a side wall continuous with the bottom wall and having a fitting hole;
a housing having a claw that fits into the fitting hole;
a board on which a light emitting element is mounted on a wiring board, the board being sandwiched and fixed between the bottom wall of the board cover and the housing by fitting the claw into the fitting hole;
a lens that is attached to the housing and serves as a light emitting surface;
Equipped with
The side wall has a step portion that provides a step between a first portion on the tip side and a second portion on the bottom wall side,
At least a part of the fitting hole is configured by a notch that opens at the edge of the first portion on the step side and allows the mold to be removed from the bottom wall, and the bottom wall is located at a higher position than the side surface of the wiring board with reference to , and the fitting hole and the pawl fit into each other at a position higher than the second portion of the side wall;
lighting equipment. All of the fitting holes are formed by cutouts on the bottom wall side through which the mold can be removed.
The lighting device according to claim 1. A distance of all exposed conductive parts of the substrate from the fitting hole is 5 mm or more,
The lighting device according to claim 1 or 2.

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