JP2013045671A - Vehicle lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lighting fixture having uniformity of luminance of a light emitting surface.SOLUTION: The vehicle lighting fixture includes a light source (LED) and a light guide lens 6 receiving incident light from the light source from one end face in a length direction and emitting from a circumferential face, and has a plurality of lens cuts on an anti-emission surface of the light guide lens 6 in a length direction. On at least a part in the length direction of the anti-emission surface of the light guide lens 6, there are formed concave surfaces 9 combining the neighboring lens cuts 8. For example, out of the plurality of the lens cuts formed on the anti-emission surface of the light guide lens 6, the concave surfaces 9 are formed between the lens cuts 8 on a nearer side to the light source and the lens cuts on a farther side from the light source are made prism cuts.

Description

  The present invention relates to a vehicular lamp that emits light from a light source incident from one longitudinal end surface of a light guide lens from a peripheral surface of the light guide lens.

  For example, some position lamps include a light source and a light guide lens that allows light from the light source to be incident from one end surface in the longitudinal direction and emitted from the peripheral surface. A plurality of lens cuts for light distribution are formed in the longitudinal direction on the surface.

  By the way, regarding the lens cut formed in the light guide lens of the vehicular lamp, the proposal shown in FIG. 8 and FIG.

  8 and 9 are plan sectional views of the main part of the vehicular lamp. In the vehicular lamp shown in FIG. 8, the light emitting lens (light guide column) 106 has a sawtooth shape on the non-emission surface (rear surface). The shape of the plurality of lens cuts (notches) 108 formed, in particular, the first and second lens cuts (notches) 108 from the left are devised, and the light of the light emitting diodes 105 incident from the longitudinal end face of the light guide lens 106 is reflected. After total reflection by all the lens cuts 108, the light is emitted from the light emission surface (front surface) of the light guide lens 106 toward the front (downward in FIG. 8).

  In the vehicular lamp shown in FIG. 9, the light exiting surface (rear surface portion) of the light guide lens 106 is arranged so that the light from the light emitting diode 105 incident on the light guide lens (light guide column) 106 reaches far from the light emitting diode 105. ) Has a configuration in which a plurality of lens cuts (notches) 108 are discretely arranged at predetermined intervals.

JP 2011-003281 A

  However, the vehicular lamp shown in FIG. 8 has a problem in that the brightness difference between the light emitting diode 105 as the light source and the distance between the light emitting diode 105 is large and the brightness of the light emitting surface is poor.

  Further, in the vehicular lamp shown in FIG. 9, the brightness difference between light near and far from the light emitting diode 105 as the light source is smaller than that of the vehicular lamp shown in FIG. There is a problem that once is bad.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a vehicular lamp in which the brightness uniformity of the light emitting surface is high.

  In order to achieve the above object, an invention according to claim 1 is provided with a light source and a light guide lens that causes light from the light source to be incident from one end surface in the longitudinal direction and emitted from a peripheral surface. In the vehicular lamp formed by forming a plurality of lens cuts in the longitudinal direction on the surface, a concave curved surface that connects the adjacent lens cuts is formed on at least a part of the anti-light-emitting surface of the light guide lens in the longitudinal direction. Features.

  According to a second aspect of the present invention, in the first aspect of the present invention, the concave curved surface is formed between the lens cuts on the side closer to the light source among the plurality of lens cuts formed on the light exit surface of the light guide lens. The lens cut on the side far from the light source is a prism cut.

  According to the present invention, since the concave curved surface is formed between the lens cuts on the side close to the light source among the plurality of lens cuts formed on the opposite exit surface of the light guide lens, the light from the light source diffuses on the concave curved surface. It reaches the far side from the light source. Then, the light that is totally reflected in the light guide lens and reaches the far side from the light source is emitted from the light exit surface of the light guide lens with the light distribution controlled by the prism cut of the light guide lens. Therefore, the light / dark difference between the light near the light source and the light far side is suppressed to be small, and the brightness uniformity of the light emitting surface of the vehicular lamp is increased. Further, by forming a concave curved surface between adjacent lens cuts, the bundled light can be diffused to obtain a light emission state without unevenness.

It is a perspective view which removes and shows the outer lens of the vehicular lamp concerning the present invention. It is a plane sectional view of the vehicular lamp concerning the present invention. FIG. 3 is an enlarged detail view of a part A in FIG. 2. It is the B section enlarged detail drawing of FIG. It is the C section enlarged detail drawing of FIG. It is a figure similar to FIG. 5 which shows another form of the prism cut given to a light guide lens. It is a figure similar to FIG. 5 which shows another form of the prism cut given to a light guide lens. It is a plane sectional view of the conventional vehicular lamp main part. It is a plane sectional view of the conventional vehicular lamp main part.

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

  FIG. 1 is a perspective view showing an outer lens of a vehicular lamp according to the present invention with the outer lens removed, FIG. 2 is a plan sectional view of the vehicular lamp, FIG. 3 is an enlarged detail view of a portion A in FIG. FIG. 5 is an enlarged detail view of a portion C in FIG.

  A vehicular lamp 1 according to the present embodiment is a laterally elongated position lamp, as shown in FIG. 2, in a lamp chamber 4 defined by a housing 2 and a transparent outer lens 3 covering its opening. The light source LED 5 and the light guide lens 6 for guiding the light from the LED 5 over the entire width direction are accommodated.

  The housing 2 is integrally formed of an opaque resin, and as shown in FIG. 1, a light source accommodating portion 2A having a substantially rectangular box shape is formed at one end in the longitudinal direction of the housing 2 (left end in FIG. 1). A rectangular plate-shaped LED substrate 7 is accommodated and held in the light source accommodating portion 2A of the housing 2, and one LED 5 serving as a light source is mounted on the LED substrate 7 (see FIG. 2).

  An elongated lens housing portion 2B is integrally extended from the light source housing portion 2A of the housing 2 in the lateral direction. As shown in FIG. Brackets 2a and 2b for attaching the lamp 1 to a vehicle body (not shown) are integrally formed.

  Thus, the lamp chamber 4 defined by the housing 2 and the outer lens 3 has an arcuate shape in plan view in which the central portion in the width direction bulges in the light emitting direction (upward in FIG. 2) as shown in FIG. The light guide lens 6 accommodated in the lamp chamber 4 is formed in a shape that is bent in the shape of a bow in a plan view along the shape of the lamp chamber 4.

  As shown in FIG. 1, the light guide lens 6 is configured as a prism that is bent in an arcuate shape, its left and right end portions 6A and 6B are inclined obliquely, and the left and right center portion 6C is horizontally linear. It extends to. As shown in FIGS. 2 and 3, one end surface in the longitudinal direction of the light guide lens 6 (left end surface in FIGS. 2 and 3) has an incident surface 6a facing the LED 5 mounted on the LED substrate 7. A concave spherical surface 6b is formed at a portion of the incident surface 6a facing the LED 5.

  By the way, in the light guide lens 6, the surface (upper surface in FIG. 2) facing the outer lens 3 of the parts 6B and 6C excluding the end portion 6A on the side close to the LED 5 is the light exit surface. As will be described later, a plurality of lens cuts are formed on the surface (opposite exit surface) facing the opposite housing 2. Specifically, as shown in FIG. 4, a plurality of V-notch-shaped lens cuts 8 are formed at appropriate intervals on the anti-light-emitting surface of the light guide lens 6 on the side close to the LED 5. Concave surfaces 9 are respectively formed between adjacent ones of the lens cuts 8. That is, adjacent lens cuts 8 are connected to each other by the concave curved surface 9.

  On the other hand, as shown in FIG. 5, a prism cut 10 formed by densely arranging serrated notches (right triangle shapes) without gaps is formed on the opposite light emitting surface of the light guide lens 6 from the LED 5 side. . The shape of the prism cut 10 is not limited to the sawtooth shape, and for example, the shape shown in FIGS. 6 and 7 can be employed.

  In the vehicular lamp 1 configured as described above, when current is supplied to the LED 5 that is a light source disposed at one end in the left-right direction in the lamp chamber 4 and the LED 5 emits light, the light is emitted from the light guide lens 6. The light enters the light guide lens 6 from the incident surface 6a at one end in the longitudinal direction (left end in FIG. 2). At this time, since the concave spherical surface 6b is formed on the incident surface 6a of the light guide lens 6, the light emitted from the LED 5 enters the light guide lens 6 while being diffused around by the concave spherical surface 6b.

  As described above, when the light from the LED 5 enters the light guide lens 6 from the incident surface 6a at one end in the longitudinal direction of the light guide lens 6, this light is transmitted through the light guide lens 6 as shown in FIGS. It advances to the central portion 6C while totally reflecting the inside of the inclined one end portion 6A. Then, the light traveling to the central portion 6C of the light guide lens 6 is reflected by the concave spherical surface 9 formed on the anti-light-emitting surface of the light guide lens 6 on the side close to the LED 5 to the surroundings as shown in FIG. The light travels away from the LED 5 while diffusing, and part of the light exits from the exit surface of the light guide lens 6 to the outside. In addition, another part of the light traveling while totally reflecting the light guide lens 6 is reflected by the cut surface of the lens cut 8 and is emitted to the outside from the light emission surface of the light guide lens 6. In addition, the light radiate | emitted outside from the output surface of the light guide lens 6 can touch a person's eyes by passing the outer lens 3, and can make the said vehicle lamp 1 recognize a driver | operator and a pedestrian.

  Then, the light traveling while being diffused by the concave spherical surface 9 formed on the side opposite to the LED 5 of the light guide lens 6 is controlled by the prism cut 10 on the side far from the LED 5 as shown in FIG. The light is emitted from the light exit surface of the light guide lens 6 to the outside.

  As described above, in the vehicular lamp 1 according to the present embodiment, among the plurality of lens cuts formed on the light exit surface of the light guide lens 6, the concave curved surface 9 is provided between the lens cuts 8 on the side close to the light source. Therefore, the light from the LED 5 diffuses on the concave curved surface 9 and reaches the side far from the LED 5. Then, the light that is totally reflected inside the light guide lens 6 and reaches the far side from the LED 5 is emitted from the light exit surface of the light guide lens 6 with the light distribution controlled by the prism cut 10 of the light guide lens 6. In this case, by forming the concave curved surface 9 between the lens cuts 8 adjacent to each other on the light-exiting surface of the light guide lens 6, the bundled light can be diffused to obtain a light emission state without unevenness.

  Therefore, according to the vehicular lamp 1 according to the present embodiment, the light / dark difference between light near and far from the LED is suppressed, and the brightness uniformity of the light emitting surface of the vehicular lamp 1 is increased. The effect of being obtained.

  Although the present invention has been described with respect to an embodiment in which the present invention is applied to a position lamp, the present invention is similarly applied to any other vehicular lamp that employs a system in which light from a light source is guided by a light guide lens. Of course, it is applicable to.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Housing 2A Light source accommodating part of housing 2B Lens accommodating part 2a, 2b Housing bracket 3 Outer lens 4 Lamp chamber 5 LED (light source)
6 Light Guide Lenses 6A, 6B Left and Right Ends of Light Guide Lens 6C Center of Light Guide Lens Left and Right 6a Light Guide Lens Incident Surface 6b Light Guide Lens Concave Spherical Surface 7 LED Substrate 8 Light Guide Lens Cut 9 Light Guide Concave spherical surface of lens 10 Prism cut of light guide lens

Claims (2)

A vehicle comprising: a light source; and a light guide lens that causes light from the light source to be incident from one end surface in the longitudinal direction and emitted from the peripheral surface, and a plurality of lens cuts are formed in the longitudinal direction on a non-emission surface of the light guide lens In the lighting equipment,
A vehicular lamp characterized in that a concave curved surface that connects the adjacent lens cuts is formed at least in a part of a longitudinal direction of the light exit surface of the light guide lens. Among the plurality of lens cuts formed on the light exit surface of the light guide lens, the concave curved surface is formed between the lens cuts on the side close to the light source, and the lens cut on the side far from the light source is a prism cut. The vehicular lamp according to claim 1.

Images