JP2016134323A - Vehicle lighting appliance - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lighting appliance which can enhance the use efficiency of light from an LED and the attachment workability of a baseboard.SOLUTION: In a clearance lamp (vehicle lighting appliance) 6 which comprises LEDs 10, baseboards 11, 12 mounted with the LEDs 10, a light guide body 8 for guiding light in a longitudinal direction which is incident from the LEDs 10 arranged approximate to both ends in a longitudinal direction, and a holder 7 for holding the light guide body 8, one end of the light guide body 8 in the longitudinal direction is positioned and fixed to one end of the holder 7 in the longitudinal direction by positioning ribs 8a, 8b, one baseboard 11 which is arranged approximate to one end of the light guide body 8 in the longitudinal direction is fixed to one end of the holder 7 in the longitudinal direction, the other baseboard 12 is fixed to a bracket 16, and the bracket 16 which is fixed with the baseboard 12 is fixed to the other end of the light guide body 8 in the longitudinal direction.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vehicular lamp including a light guide that guides light incident from an LED (light emitting diode) in a longitudinal direction.

  In recent years, LEDs having high luminous efficiency and long life have been used as light sources for vehicle lamps. For example, clearance lamps arranged on the left and right of the front part of the vehicle and tail lamps arranged on the left and right of the rear part of the vehicle are provided with a light guide that diffuses and emits light incident from the LED in the longitudinal direction. (For example, see Patent Documents 1 and 2). FIG. 11 shows an example of the fixing structure of the LED and the board on which the LED is mounted in such a vehicle lamp.

  That is, FIG. 11 is a partial perspective view showing a fixing structure of an LED and a board on which the LED is mounted in a conventional vehicle lamp. As shown in FIG. A plurality of places are held by a hook structure in a laterally long holder 107 arranged along the light body 108. A substrate 111 on which an LED (not shown) is mounted is disposed in the vicinity of the longitudinal end portion of the light guide 108, and the substrate 111 is fixed to one end in the longitudinal direction of the holder 107 with a screw 113. Yes.

  An LED (not shown) is mounted on the substrate 111 such that its optical axis coincides with the longitudinal direction of the light guide 108, and light emitted from the LED is emitted from one end surface of the light guide 108 in the longitudinal direction. The light enters the light guide 108 from the incident surface. The light incident on the inside of the light guide 108 is a step formed on the back surface of the light guide 108 in the process of proceeding in the light guide 108 in the longitudinal direction (right direction in FIG. 11) while being totally reflected. The entire light guide 108 emits light uniformly because it is diffused by, for example, the light and emitted from the front surface (light exit surface) of the light guide 108.

JP 2013-152876 A JP 2005-012854 A

  However, in the structure for fixing the LED and the substrate 111 in the conventional vehicle lamp shown in FIG. 11, the substrate 111 is fixed to the holder 107 with the screw 113, so that the substrate 111 is considered in consideration of the thermal expansion of the light guide 108. It is necessary to form a predetermined amount of clearance δ between the light guide 108 and the light guide 108 (an amount capable of absorbing thermal expansion of the light guide 108). For this reason, there is a problem in that light from the LED leaks from the clearance δ and light utilization efficiency deteriorates.

  Further, since the screwing direction of the screw 113 for fixing the substrate 111 to the holder 107 is limited to the direction perpendicular to the incident surface of the light guide 108, the workability of mounting the substrate 111 due to interference with peripheral components and the like. There is also a problem that is bad.

  The present invention has been made in view of the above problems, and an object thereof is to provide a vehicular lamp that can improve the utilization efficiency of light from an LED and the mounting workability of a substrate.

In order to achieve the above object, an invention according to claim 1 is directed to an LED, a substrate on which the LED is mounted, and a light guide that guides light incident from the LED disposed close to at least one end in the longitudinal direction in the longitudinal direction. And a vehicle lamp comprising a holder for holding the light guide,
One end in the longitudinal direction of the light guide is positioned and fixed to one end in the longitudinal direction of the holder by a positioning rib,
The substrate is fixed to a bracket, and the bracket to which the substrate is fixed is fixed to the other end in the longitudinal direction of the light guide.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the bracket is positioned at the other end in the longitudinal direction of the light guide by engagement of a positioning pin.

  According to the present invention, since one end in the longitudinal direction of the light guide is positioned and fixed to one end in the longitudinal direction of the holder by the positioning rib, the light guide is thermally expanded and contracted from the one end in the longitudinal direction. Therefore, the substrate fixed to the other end in the longitudinal direction of the light guide through the bracket and the LED mounted thereon are displaced together with the heat-extensible light guide and the positional relationship with respect to the light guide does not change. In addition, since one end in the longitudinal direction of the light guide is fixed to the holder and is not displaced, the positional relationship between the substrate disposed on the one end side in the longitudinal direction of the light guide and the LED mounted on the substrate and the light guide It does not change. Therefore, by arranging both substrates close to the longitudinal end of the light guide, the clearance between each substrate and the longitudinal end of the light guide can be kept small, and the clearance from the light from the LED can be reduced. Leakage can be suppressed and the utilization efficiency of light from the LED can be increased.

  In addition, the other substrate is fixed to the bracket in advance, and the bracket to which the substrate is fixed is fixed to the other end in the longitudinal direction of the light guide, so that the fixing of the substrate to the bracket does not interfere with peripheral components and the like. This can be done from any direction, which improves the workability of mounting the board.

It is a perspective view of a front combination lamp. 1 is a perspective view of a vehicle lamp (clearance lamp) according to the present invention. It is a disassembled perspective view of the vehicle lamp (clearance lamp) which concerns on this invention. It is a perspective view of the holder of the vehicular lamp (clearance lamp) concerning the present invention. It is a figure of the arrow A direction of FIG. FIG. 6 is a sectional view taken along line B-B in FIG. 5. It is CC sectional view taken on the line of FIG. It is a figure of the arrow D direction of FIG. It is the EE sectional view taken on the line of FIG. It is the FF sectional view taken on the line of FIG. It is a fragmentary perspective view which shows the fixing structure of LED in the conventional vehicle lamp, and the board | substrate which mounts this.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a perspective view of a front combination lamp disposed on the left and right of a front portion of a vehicle. The illustrated front combination lamp 1 is a lamp defined by a housing 2 and a transparent outer lens (not shown) that covers a front opening thereof. As a plurality of lamp units having different functions, a low beam lamp 3, a high beam lamp 4 and a turn signal lamp 5, which are arranged in parallel in the horizontal direction, and a laterally long clearance lamp 6 disposed in the upper part of the lamp chamber are provided. Contained and configured. Since the left and right front combination lamps 1 are symmetrical and have the same basic configuration, only one front combination lamp 1 will be illustrated and described below.

  The vehicle lamp to which the present invention is directed is the clearance lamp 6, and details of the clearance lamp 6 will be described below with reference to FIGS. 2 and 3.

  FIG. 2 is a perspective view of the clearance lamp, and FIG. 3 is an exploded perspective view of the clearance lamp. The illustrated clearance lamp 6 includes a holder 7, a light guide 8 and an inner lens 9 having a lateral L shape when viewed from the front. ing. Here, the holder 7 is integrally formed of a light-impermeable resin, and as shown in FIG. 3, a front side lateral L-shaped recess for housing the light guide 8 is provided on the front side thereof. 7a is open.

  The light guide 8 is a rod-shaped member integrally formed in a horizontal L shape when viewed from the front using a transparent resin such as acrylic or polycarbonate, and as shown in FIG. And a vertical portion 8B that integrally extends obliquely downward from one longitudinal end (left end in FIG. 3) of the portion 8A. Then, in the vicinity of both ends in the longitudinal direction of the horizontal portion 8B of the light guide 8, the substrates 11 and 12 on which the LEDs 10 as the light sources are mounted are respectively arranged close to each other, and near the tip (free end) of the vertical portion 8B. The board | substrate 13 with which LED10 was similarly mounted is arrange | positioned closely. Here, both end faces in the longitudinal direction of the horizontal portion 8A of the light guide 8 and the end surfaces of the vertical portion 8B constitute an entrance surface, and the front surfaces of the horizontal portion 8A and the vertical portion 8B constitute an exit surface. Although not shown, a plurality of light diffusion triangular prism-like steps are continuously formed along the longitudinal direction on the back surfaces of the horizontal portion 8A and the vertical portion 8B of the light guide 8.

  Thus, the substrate 11 disposed close to one longitudinal end (left end in FIG. 3) of the horizontal portion 8A of the light guide 8 is fixed to the longitudinal end (left end in FIG. 3) of the holder 7 by the screw 14. The substrate 12 disposed close to the other longitudinal end of the horizontal portion 8A (the right end in FIG. 3) is fixed to the bracket 16 by screws 15, and the bracket 16 to which the substrate 12 is fixed is the horizontal portion of the light guide 8. The other end in the longitudinal direction of 8A (the right end in FIG. 3) is fixed by a screw 17. The substrate 13 is fixed to the front end of the vertical portion 8B of the light guide 8 with screws 18. The light emitting direction (optical axis) of each LED 10 mounted on each substrate 11, 12, 13 is perpendicular to the incident surfaces of the horizontal portion 8 </ b> A and the vertical portion 8 </ b> B of the light guide 8. Yes.

  As described above, the light guide 8 to which the substrates 12 and 13 are fixed is fitted and held in the concave portion 7a opened on the front surface of the holder 7 to which the substrate 11 is fixed, and the concave portion 7a of the holder 7 is the inner lens 9. The clearance lamp 6 shown in FIG. 2 is assembled. Here, the inner lens 9 is integrally formed in a horizontal L shape when viewed from the front by a colored transparent resin, and this is cut for light distribution control.

  In the clearance lamp 6 configured as described above, when current is supplied to each LED 10 from a power source (not shown) via the substrates 11 to 13, each LED 10 emits light, and the light is emitted from each light guide 8. The light enters the light guide 8 from the incident surface. Then, the light incident on the inside of the light guide 8 is diffused by the steps formed on the back surface of the light guide 8 in the process of proceeding in the longitudinal direction while repeating total reflection in the light guide 8. The entire light guide 8 emits light in an L shape when viewed from the front, and the light emitted from the light guide 8 fulfills its original function.

  Here, the details of the fixing structure of the LED 10 and the substrates 11 and 12 on which the LED 10 is mounted in the horizontal portion 8A of the light guide 8 will be described with reference to FIGS.

  4 is a perspective view of the holder, FIG. 5 is a view in the direction of arrow A in FIG. 4, FIG. 6 is a cross-sectional view along the line BB in FIG. 5, FIG. 7 is a cross-sectional view along the line CC in FIG. 4 is a view in the direction of arrow D in FIG. 4, FIG. 9 is a cross-sectional view taken along line EE in FIG. 8, and FIG. 10 is a cross-sectional view taken along line FF in FIG.

  At one longitudinal end (left end) of the horizontal portion 8A of the light guide 8, two positioning ribs 8a and 8b project from the light guide 8 as shown in FIG. 8a and 8b are engaged with the end surface of the holder 7 and the rib 7b, so that one end in the longitudinal direction of the horizontal portion 8A of the light guide 8 is fixed in a state where the holder 8 is positioned. Then, as shown in FIG. 7, a screw 14 inserted through the substrate 11 is screwed into the boss portion 7c at one end in the longitudinal direction of the holder 7 in which one end in the longitudinal direction of the horizontal portion 8A of the light guide 8 is positioned and fixed in this way. As a result, the substrate 11 is fixed to one end in the longitudinal direction of the holder 7.

  In this embodiment, the LEDs 10 are disposed at both ends in the longitudinal direction of the light guide 8. However, the LEDs 10 are not necessarily disposed close to both ends in the longitudinal direction of the light guide 8. What is necessary is just to arrange | position to the at least one end of a longitudinal direction. At that time, as shown in FIG. 6, two positioning ribs 8a and 8b are projected from the end of the light guide 8 on the side where the LED 10 is not disposed, and these positioning ribs 8a, 8b, By engaging 8b with the end surface of the holder 7 and the rib 7b, one end in the longitudinal direction of the horizontal portion 8A of the light guide 8 is fixed with the holder 7 positioned, and one end in the longitudinal direction of the light guide 8 is long. Do not move in the direction. The LED 10 disposed at the other end in the longitudinal direction of the light guide 8 is mounted on the substrate 12, the substrate 12 is fixed to the bracket 16, and the bracket 16 is fixed to the other end in the longitudinal direction of the light guide 8. Therefore, the positional relationship between the LED 10 and the light guide 8 can be made constant even when the light guide 8 is thermally expanded and contracted as in the above embodiment.

  On the other hand, the substrate 12 disposed on the other end (right end) in the longitudinal direction of the horizontal portion 8A of the light guide 8 is fixed to the bracket 16 with screws 15 in advance. Here, as shown in FIG. 9, positioning pins 16 a project from the side portions of the bracket 16, and the positioning pins 16 a of the bracket 16 are engaged with the positioning holes 12 a formed in the substrate 12. By doing so, it is accurately positioned with respect to the bracket 16. And the board | substrate 12 positioned in this way is fixed to the side part of the bracket 16 with the screw | thread 15, as shown in FIG. In this case, the screw 15 is screwed in a direction (optical axis direction of the LED 10) perpendicular to the incident surface of the horizontal portion 8A of the light guide 8.

  By the way, as shown in FIG. 8, a stay 8C having a trapezoidal shape in plan view is formed integrally with the other end (right end) in the longitudinal direction of the horizontal portion 8A of the light guide 8, and the stay 8C has a circular hole. A positioning hole 8c and a long positioning hole 8d are formed. Further, as shown in FIG. 9, two positioning pins 16b project from the side of the bracket 16, and the bracket 16 to which the substrate 12 is fixed guides the positioning pins 16b projecting therefrom. By being engaged with positioning holes 8 c and 8 d formed in the stay 8 </ b> C of the light body 8, the light body 8 is accurately positioned. And the bracket 16 positioned in this way is fixed to the longitudinal direction other end part (right end part) of the horizontal part 8A of the light guide 8 by the screw 17, as shown in FIG. The screwing direction of the screw 17 in this case is arbitrary, and in this embodiment, the screw 17 is inclined with respect to the longitudinal direction of the horizontal portion 8A of the light guide 8 (the optical axis direction of the LED 10).

  Thus, in the structure for fixing the LED 10 and the substrates 11 and 12 in the present embodiment, the longitudinal end of the horizontal portion 8A of the light guide 8 is positioned and fixed to the longitudinal end of the holder 7 by the positioning ribs 8a and 8b. The horizontal portion 8A of the light guide 8 thermally expands and contracts starting from one end in the longitudinal direction. For this reason, the substrate 12 fixed to the other end in the longitudinal direction of the horizontal portion 8A of the light guide 8 via the bracket 16 and the LED 10 mounted thereon are displaced together with the light guide 8 that is thermally expanded and contracted, and the light guide The positional relationship with respect to 8 does not change. Further, since one end in the longitudinal direction of the horizontal portion 8A of the light guide 8 is fixed to the holder 7 and is not displaced, it is mounted on the substrate 11 disposed on one end side in the longitudinal direction of the horizontal portion 8A of the light guide 8 and this. The positional relationship between the LED 10 and the light guide 8 does not change. Therefore, by arranging both the substrates 11 and 12 close to the longitudinal end of the horizontal portion 8A of the light guide 8, the substrates 11 and 12 and the longitudinal end of the horizontal portion 8A of the light guide 8 are connected. Clearances δ1 and δ2 (see FIGS. 7 and 9) can be kept small, leakage of light from the LEDs 10 from the clearances δ1 and δ2 can be suppressed, and the utilization efficiency of light from the LEDs 10 can be increased.

  In addition, the other substrate 12 is fixed to the bracket 16 in advance, and the bracket 16 to which the substrate 12 is fixed is fixed to the other longitudinal end of the horizontal portion 8A of the light guide 8 with a screw 17, so that the substrate 12 Fixing to the bracket 16 can be performed from any direction without interfering with peripheral components and the like, thereby obtaining an effect that the workability of mounting the substrate 12 is improved.

  Although the present invention has been described with respect to a mode in which the present invention is applied to a clearance lamp, the present invention is similarly applied to any other vehicular lamp provided with a light guide that emits light by light from an LED. Of course, it is possible. For example, the present invention can be similarly applied to a stop lamp or a turn signal lamp of a rear combination lamp disposed on the left and right of the rear part of the vehicle. Further, the present invention can be applied to a tail lamp, a stop lamp, or a turn signal lamp of an LID lamp arranged in a trunk along with a rear combination lamp. Furthermore, the present invention can also be applied to daytime running lamps, turn signal lamps, and the like of front combination lamps arranged on the left and right of the front portion of the vehicle.

1 Front combination lamp 6 Clearance lamp (vehicle lamp)
7 Holder 8 Light guide 8A Horizontal portion of light guide 8B Vertical portion of light guide 8C Stay 8a and 8b of light guide 8 Positioning rib 8c and 8d Positioning hole of light guide 9 Inner lens 10 LED
11-13 Substrate 14,15 Screw 16 Bracket 16a, 16b Bracket positioning pin 17,18 Screw

Claims (2)

A vehicle lamp comprising: an LED; a substrate on which the LED is mounted; a light guide that guides light incident from the LED disposed close to at least one end in the longitudinal direction; and a holder that holds the light guide In
One end in the longitudinal direction of the light guide is positioned and fixed to one end in the longitudinal direction of the holder by a positioning rib,
A vehicular lamp characterized in that the substrate is fixed to a bracket, and the bracket to which the substrate is fixed is fixed to the other longitudinal end of the light guide. 2. The vehicular lamp according to claim 1, wherein the bracket is positioned at the other longitudinal end of the light guide body by engagement of a positioning pin.

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