JPH0251802A - Fitting structure of printed circuit board in lighting fixture for vehicle - Google Patents

Abstract

PURPOSE:To surely pinch a printed circuit board over its whole length with a simple structure and prevent the deformation in the thickness direction by integrally providing positioning and pinching sections at portions vertically facing each other on inner faces of a lighting fixture body and a front lens respectively. CONSTITUTION:A lighting fixture unit 24 constituted of a front lens 23 closed by a lighting fixture body 22 on the upper opening section is provided, the lighting fixture body 22 and the front lens 23 are integrally connected, thereby the upper and lower ends of a printed circuit board 26 are pinched by positioning and pinching sections 39 and 40. The fitting work of the printed circuit board 26 can be performed simply, easily and quickly without requiring any set screw at all. The whole length of the printed circuit board can be pinched, thus the deformation in the longitudinal direction can be surely prevented, the interval between an inner lens 25 and a light emitting diode 27 can be kept constant.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a mounting structure for a printed circuit board in a vehicular lamp suitable for use in a high-mounted stop lamp or the like that extends long in the width direction of a vehicle body.

[Conventional technology]

Conventionally, there have been many stop lamps, commonly known as high-powered stop lamps, which are installed at the rear of the car body and illuminated together with the brake lights when the brakes are applied to alert the following vehicles, etc., as shown in Figure 12. A light emitting diode is used as a light source. That is, 1 is a lamp body formed long in the width direction of the vehicle body, 2 is a front face plate that covers the front opening of the lamp body 1, and these two members constitute the lamp unit 3, and the interior thereof is An elongated printed circuit board 5 having a large number of light emitting diodes 4 arranged in parallel in the longitudinal direction is disposed. The printed circuit board 5 is fixed by setscrews T to a plurality of board mounting portions 6 which are protruded from the inner surface of the lamp body 1 at appropriate intervals. A large number of condensing lenses 8 are integrally protruded from the inner surface of the front lens 2, corresponding to each light emitting diode 4.

[Problem a that the invention attempts to solve]

By the way, conventionally, the printed circuit board 5 is fixed to the board mounting part 6 of the lamp body 1 with screws as described above, but if the printed circuit board 5 itself is long and thin, fixing it only at a few points in the longitudinal direction will result in the problem shown in FIG. As shown, the unfixed portion is locally deformed in the thickness direction, and as a result, the distance between the light emitting diode 4 in the deformed portion and the corresponding condensing lens 8 changes, resulting in desired light distribution performance. There was a problem that it became impossible to obtain.

Therefore, a way to solve this problem is to increase the number of board mounting parts 6 or to divide the printed circuit board 5, but this would reduce the number of setscrews 7 and the man-hours for mounting the printed circuit board 5. This results in a problem of increased manufacturing costs.

Therefore, the present invention solves the above-mentioned problems and
It is an object of the present invention to provide a mounting structure for a printed circuit board in a vehicular lamp, which can securely hold the printed circuit board over its entire length with a simple structure and prevents deformation in the thickness direction.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a nine-light fixture that has a light body and a front lens, and has a printed circuit board in which a large number of light emitting diodes are arranged in parallel. positioning and clamping parts are integrally provided on the inner surfaces of the lamp body and the front lens that are vertically opposed to each other, and these positioning and clamping parts position and clamp the upper and lower ends of the small front printed circuit board. It was designed to do so.

[Effect]

In the present invention, the positioning and clamping portion positions and clamps the upper and lower ends of the printed circuit board to prevent deformation in the board thickness direction.

〔Example〕

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

FIG. 1 is a side cross-sectional view showing an embodiment in which the printed circuit board mounting structure according to the present invention is applied to a high-performance stop lamp, and FIG. 2 is a partially cutaway front view of the same lamp.

In these figures, 20 is a vehicle body, and 21 is a high-power stop lamp installed on the vehicle body 20. This lamp 21 is formed into a plate shape by extrusion molding of At, etc., and extends in the left and right direction of the vehicle body 20. The lamp body 22 includes a lamp body 22 that extends in the width direction of the vehicle body, and a front lens 23 that is formed in a substantially -shape so that the upper surface thereof is open and the upper surface opening is closed by the lamp body 22. A knit 24 is provided, and an inner lens 25, a printed circuit board 26 on which a large number of light emitting diodes 2T are mounted, and a defining member 28 for accommodating and defining each light emitting diode 2T are housed therein.

The front panel 23 is made of a translucent plastic material or glass and is formed into a box shape elongated in the left-right direction.
The open end 32 is fitted into a rectangular frame-shaped fitting groove 2g formed on the lower surface of the lamp body 22 via a gasket 33, and fixed with an adhesive. Further, the front lens 23 is arranged from the inside of the vehicle body 20 to the lamp body 22.
The lamp body 22 and the lamp body 22 are firmly fixed on the vehicle body 20 by a set screw 35 screwed into a screw mounting portion 30 provided vertically on the inner surface of the lamp body 22 . The screw mounting portion 30 is attached to the lamp body 2.
A plurality of screw holes 34 are formed at appropriate intervals in the longitudinal direction of the front cover 23, and correspondingly screw holes 34 are formed on the bottom surface of the front cover 23.

The inner lens 25 is disposed behind the front plate 31 of the front lens 23 so as to face it, and on its surface, a diffusion lens 36 consisting of a large number of small convex lenses is densely formed. A plurality of condensing lenses 3γ are formed on the back side so as to correspond to each of the light emitting diodes 27, respectively.

The printed circuit board 26 faces the inner lens 25 at a predetermined distance behind the inner lens 25, and its upper and lower ends are integrated with the lower surface of the lamp body 22 and the inner bottom surface of the front lens 23, respectively. It is positioned and clamped by positioning and clamping parts 39 and 40 (FIGS. 1 and 3) that protrude from the. Positioning and clamping part 38.
A plurality of protrusions 40 are formed at appropriate intervals in the longitudinal direction of the lamp unit 24, and the basic structure thereof is a pair of protrusions 4 that face each other in the front and rear with the printed circuit board 26 in between, as shown in FIG.
1m and 41b, and by inserting the printed circuit board 26 between these protrusions 41a and 41b, the positioning in the front-rear direction is performed. The pair of protrusions 41a, 41b may be long in either the left or right direction, as long as the distance therebetween is approximately equal to the thickness of the printed circuit board 26.

The horizontal positioning of the printed circuit board 26 is performed using the projections 41.
a chevron-shaped positioning protrusion 42 protruding between m and 4Ib;
This is done by substantially V-shaped notch grooves 43 formed on the upper and lower ends of the printed circuit board 26 and into which the positioning projections 42 engage. In this case, the positioning protrusion 42 is not limited to the protrusion 4.
1a and 4Ib. For example, the third
As shown by the broken line 45 in the figure, in a case where the printed circuit board 26 is approximately U-shaped in plan view, and the lower right end of the printed circuit board 26 is inserted and locked into the recess 44, the printed circuit board 26 can be moved to the right and in the front and rear directions at the same time. Can be regulated.

Further, in this embodiment, a plurality of positioning and clamping parts 39 and 40 are provided.
Although an example has been shown in which the upper and lower ends of the printed circuit board 26 are positioned and clamped, the present invention is not limited to this, and it goes without saying that they may be formed in a series.

The demarcation member 28 is made of an opaque plastic material and is formed long in the left and right direction to accommodate all the light emitting diodes 27, and is fixed to the surface of the printed circuit board 26 to accommodate each light emitting diode 27 individually. It has a large number of storage sections 47. The storage portion 4T is defined by the defining member 28
It consists of a through hole opening on the front and rear surfaces of the light emitting diode 2T, and the front side opening forms a reflecting surface 48 in the shape of a paraboloid of revolution, so as to reflect the light emitted from the light emitting diode 2T forward.

In this case, since the light emitting diode 21 is placed at the focal point of the paraboloid of revolution, the light from the light emitting diode 27 that hits the reflective surface 48 and is reflected becomes parallel light parallel to the optical axis and travels forward. After the light is focused and diffused by the condensing lens 37 and the diffusing lens 36, the front plate 31 of the front lens 23
It passes through and emits to the outside.

Thus, in the mounting structure of the printed circuit board 26 as described above, when the lamp body 22 and the front lens 23 are integrally connected, the upper and lower ends of the printed circuit board 26 are clamped by the positioning and clamping parts 39 and 40. This eliminates the need for any setscrews and allows the printed circuit board 2
6 can be done simply, easily and quickly, and a configuration can be adopted in which the entire length of the printed circuit board 26 is held.
Deformation in the front-back direction can be reliably prevented, and the inner lens 2
5 and the light emitting diode 27 can be kept constant.

Therefore, the light distribution of the lamp is also good.

FIGS. 4 to 8 show an embodiment in which the present invention is applied to a stop lamp inserted 1 cffl into a rear spoiler, and FIG. 4 is an external perspective view of an automobile equipped with a rear spoiler;
Figure 5 is a front view of the main parts of the stop lamp, Figure 6 is a sectional view taken along the line ■-■ in Figure 5, and Figure 7 is an enlarged sectional view taken along the line ■-■ in Figure 5.
FIG. 8 is a sectional view taken along the line ■--■ in FIG. 5. In these figures, 50 indicates a gas foot 51 (
52 is a stop lamp, and this stop lamp 52 is provided at the lower surface of the longitudinal center of the rear projecting end of the rear spoiler 50 and has a required length. It is arranged in an elongated notch 53 of. The stop lamp 52 is connected to the lamp body 5
4 and a front lens 55. Inside the lamp unit 56, a printed circuit board 26 on which a large number of light emitting diodes 27 are mounted is disposed.

The lamp body 54 is formed into a flat plate shape and is housed approximately vertically within the rear spoiler 50, and a plurality of fixing pieces 57 (FIG. 6) are integrally provided on the back surface of the lamp body 54 and protrude toward the front of the vehicle body. These fixing pieces 5T are firmly fixed to a fixing portion (not shown) provided on the rear spoiler 50 with tightening bolts.

The front lens 55 is formed of a translucent resin colored red or the like in the shape of a longitudinally long axis with an open back surface, and the back opening portion is fixed to the front surface of the lamp body 54 by ultrasonic welding or the like. and multiple setscrews 5B.
It is fixed in place. The front part 60 of the front lens 55 (
FIG. 7) has a convex curved surface that substantially coincides with the rear protruding end of the rear spoiler 50 to close the notch 53, and the front end of the lower surface is integrally formed with a thick wall portion 61 that continues to the lower part of the front surface portion 60. It is installed protrudingly. The thick part 61 covers the lower part of the cutout part 53, and its bottom face 62 forms a slope that slopes forward and downward, and has a substantially fan-shaped cross section. It forms a reflective surface that reflects light emitted diagonally downward toward the front of the lens. A portion of the notch 53 that opens below the stop lamp 52 is covered by a flat plate-shaped auxiliary lens 63 colored in the same color as the front lens 55.
The rear end of this auxiliary lens 63 is fixed to the lower end of the lamp body 54 by ultrasonic welding or the like. A large number of light control sections 64 (described later) are formed on the inner surface of the front section 60 of the front panel 55, corresponding to each of the light emitting diodes 2.gamma.. The printed circuit board 26 is connected to the lower end front upper surface of the lamp body 54 and the front lens 5.
The upper and lower ends are clamped by the positioning and clamping parts 39 and 40 protruding from the rear end of the inner surface of the upper surface plate 66 of the top plate 66 of 5. Movement is regulated and prevented.

Note that the positioning/clamping portion 39. ．． 40 has the same configuration as that described in the above embodiment, so its explanation will be omitted.

The light control unit 64 of the front lens 55 controls the light distribution and visibility of the stop lamp 52 by guiding the light emitted from the light emitting diode 27 to the rear of the vehicle body, similar to the condensing lens 37 of the inner lens shown in the above embodiment. As shown in Figures 9 to 11, they are rectangles of approximately the same size and are vertical.

It is composed of a total of nine prisms 69A to 69r arranged in three rows of three on each side, and the center of the prism 69E located at the center substantially coincides with the center of the corresponding light emitting diode 2γ. The central prism 69g is formed into a concave curved surface with an appropriate curvature R, as shown in FIGS. 10 and 11. Four prisms 698, 69D, 69F, located above, below, left and right of the central prism 69g,
69H is the inner end, that is, the central prism 69g
The side end in contact with the prism 69g is slightly protruded from the prism 69g, and has a stepped portion TO, and the inner thickness is formed to become thinner from the inner end to the outer end. Therefore, as shown in FIG.
9D and 69F have the same substantially triangular Kff cross-sectional shape as shown in FIG. Further, the heights of the stepped portions TO of the two left and right prisms 698, 69H are higher than that of the upper prism 89D and lower than the stepped portion height of the lower prism 69F, as appropriately shown in FIG. The surfaces of the four prisms 698, 690.69F, and 69H are formed into concave curved surfaces with an appropriate curvature R1. Four prisms 69A, 69C, 69G, 69I located at the four corners
are the four prisms 698, 68 as shown in FIG.
0.69F, K is formed to protrude to be higher than 69H by a step, so it has a step 71, and its surface is directed from the inner corner 72 in contact with the central prism 69g to the corner 73 at the diagonal position. It is formed into a concave curved surface with an appropriate curvature so that it is inclined. Therefore, the four prisms 6
9A, 69C, 69G.

The plate thickness of 69I is the maximum at the inner corner T2 and the smallest at the outer corner T3, and both the vertical and cross-sectional shapes form a substantially triangular shape. Note that H is the reference thickness of the front lens 55.

As described above, the prisms 69A to 69■ (excluding the central prism 69E) have a step height of 2.
By changing the radius of curvature of the surface, the refraction angle and direction of light are different, and this makes the light emitting diode 2
The light T4 emitted from the lens 7 is refracted in the direction of the optical axis γ5, and is emitted from the front lens 55 toward the rear of the vehicle body.

In this case, in this embodiment, the surfaces of each of the prisms 69A to 69I are formed into concave curved surfaces with appropriate curvatures, but the prisms are not limited to this, and may be formed into flat surfaces, for example.

〔Effect of the invention〕

As explained above, the mounting structure of the printed circuit board in the vehicle lamp according to the present invention is such that positioning and clamping parts are integrally provided on the inner surfaces of the lamp body and the front lens that constitute the lamp unit, and these clamping parts are used to attach the printed circuit board to the vehicle lamp. Since the upper and lower ends of the printed circuit board are positioned and clamped, it is possible to securely fix the printed circuit board in a specified position without using fixing means such as set screws, reducing assembly man-hours and the number of parts. In the case of a printed circuit board, it is highly effective in preventing deformation in the board thickness direction, and the distance between the light emitting diode and the front lens can be set to be equal, and good light distribution performance can be obtained.

[Brief explanation of the drawing]

Fig. 1 is a side sectional view showing an embodiment of the present invention applied to a high-main stop lamp, Fig. 2 is a partially cutaway front view of the same lamp, Fig. 3 is a perspective view of the main part, and Fig. 4 is a partially cutaway front view of the lamp. The figure is an external perspective view of an automobile showing an embodiment in which the present invention is applied to a stop lamp incorporated in a rear spoiler, FIG. 5 is a front view of the main part of the stop lamp, and FIG. V
I-line sectional view, Figure 7 is an enlarged sectional view of Figure 5 - ■ line, Figure 8
The figures are Fig. 5 ■-■ sectional view, Fig. 9 is a perspective view of the light control section, Fig. 10 1#i Fig. 9 X-X1/s sectional view, Fig. 11 is Fig. 9 M-Ml ! J sectional view, FIG. 12 is a sectional view of a lamp showing a conventional printed circuit board mounting structure, and FIG. 13 is a perspective view showing a modification of the printed circuit board. 1.O..Lighting body, 2..φΦ front lens, 3..
...Lighting unit, 4...Light emitting diode, 5...
・・Printed circuit board, 22・・Lighting body, 2311
・φ・Front lens, 24--・Lighting unit, 26・
Fist...Printed circuit board, 2T-...Light emitting diode, 3
9.40...Positioning and holding part, 54...Lighting body, 55@# Front lens, 56...Lighting unit. Patent applicant: Koito Manufacturing Co., Ltd.

Claims (1)

[Claims] The lamp unit has a lamp body and a front lens, and has a printed circuit board in which a large number of light emitting diodes are arranged in parallel. A mounting structure for a printed circuit board in a vehicular lamp, characterized in that positioning and clamping parts are each provided integrally, and these positioning and clamping parts position and clamp the upper and lower ends of the printed circuit board.