JP2017174628A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture capable of achieving light emission in a wide range while suppressing thickness of an inner lens.SOLUTION: A vehicular lighting fixture 1 includes: a first reflection surface 7 for reflecting light entering from an LED (light source) 2 in a direction orthogonal to an optical axis AX; and an inner lens 5 in which a second reflection surface 8 is formed for reflecting the light reflected on the first reflection surface 7 in the optical axis AX direction. The second reflection surface 8 is divided into a plurality of divided pieces 8a, the adjacent divided pieces 8a are connected with each other by a flat surface 8b orthogonal to the optical axis AX, and these are arranged in a step-like manner. Then, each divided piece 8a of the second reflection surface 8 is made to be a projection R-like shape. Also, a second inner lens 6 is arranged in front of a light emission direction of the inner lens 5, and at the second inner lens 6, a light diffusion part 6A for diffusing the light emitting from the inner lens 5 is formed.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicular lamp including an inner lens for controlling light distribution of light incident from a light source.

  For example, LEDs (light emitting diodes) are being used instead of conventional bulbs (light bulbs) as light sources for vehicle lamps such as DRL (Day Running Lamp) and clearance lamps. This LED has high luminous efficiency and long life and has advantages such as power saving, but emits light with high directivity, and therefore has a problem that the light cannot be used as it is. For this reason, the light distribution of light emitted from the LED is usually controlled by an inner lens. As a lamp provided with such an inner lens, Patent Document 1 proposes a lamp shown in FIG.

  That is, FIG. 8 is a cross-sectional view of a lamp proposed in Patent Document 1, and the illustrated lamp 101 includes an LED 102 that is a light source and an inner lens 105 that is disposed forward of the light emission direction from the LED 102. . Here, the inner lens 105 is formed with a convex-curved incident surface 105a, a concave-curved central exit surface 105b, and a sloped first reflecting surface 105c at the center, and a sloped second reflecting surface around the inner lens 105. A surface 105d and a concave curved peripheral emission surface 105e are formed.

  In such a lamp 101, when the LED 102 that has been activated emits light, the light emitted from the LED 102 enters the inner lens 105 from the incident surface 105a of the inner lens 105, and the incident light has an optical axis AX. A part of the light is emitted from the central exit surface 105b as parallel light, and the other light is reflected by the first reflecting surface 105c, and its traveling direction changes by 90 °, in a direction orthogonal to the optical axis AX. move on. Then, the light traveling in the inner lens 105 in the direction orthogonal to the optical axis AX is reflected by the second reflecting surface 105d, the traveling direction thereof is changed by 90 ° and travels along the optical axis AX, and from the surrounding emitting surface 105e. Outputs to the outside. Here, by arranging the plurality of surrounding emission surfaces 105e in a polygonal vertex or lattice shape, multiple light emission can be performed in a polygonal shape or a lattice shape.

JP 2013-048062 A

  However, in the lamp 101 shown in FIG. 8, since the second reflecting surface 105d of the inner lens 105 is configured by a plane cut at 45 °, there is a problem that the light emission range is narrow. In order to widen the light emission range, it is necessary to increase the thickness of the inner lens 105 and increase the area of the second reflecting surface 105d inclined at 45 °. However, it is easy to mold the thick inner lens 105. is not.

  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 that can realize light emission in a wide range while suppressing the thickness of the inner lens.

  In order to achieve the above object, the invention according to claim 1 is directed to a first reflecting surface that reflects light incident from a light source in a direction orthogonal to the optical axis, and light reflected by the first reflecting surface in the optical axis direction. In a vehicle lamp including an inner lens having a second reflecting surface to be reflected, the second reflecting surface of the inner lens is divided into a plurality of divided pieces, and adjacent divided pieces are connected by a plane orthogonal to the optical axis. These are arranged in a staircase pattern.

  The invention described in claim 2 is characterized in that, in the invention described in claim 1, each divided piece of the second reflecting surface is formed in a convex R shape.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, a second inner lens is disposed in front of the inner lens in the light emitting direction, and the second inner lens emits light from the inner lens. A light diffusion part for diffusing light is formed.

  According to the first aspect of the present invention, the second reflecting surface of the inner lens that reflects light in a direction parallel to the optical axis is divided into a plurality of divided pieces, and adjacent divided pieces are planes orthogonal to the optical axis. Since it is connected, the range of light reflected by the second reflecting surface can be expanded while suppressing the thickness of the inner lens, and as a result, light emission in a wide range is possible.

  According to the second aspect of the present invention, the plane connecting the divided pieces of the second reflecting surface of the inner lens does not originally emit light, but each divided piece is reflected by each divided piece by forming a convex R shape. Light can be diffused so that the flat portion can also emit light, streaky unevenness due to the presence of a portion that does not emit light can be eliminated, and the entire light emitting surface can emit light uniformly.

  According to the third aspect of the present invention, since the light emitted from the inner lens can be diffused by the light diffusion portion formed on the second inner lens, the light emitting surface can emit light more uniformly.

It is a front side exploded perspective view of the vehicular lamp according to the present invention. It is a back side exploded perspective view of the vehicular lamp concerning the present invention. It is a plane sectional view of the vehicular lamp concerning the present invention. It is the A section enlarged detail drawing of FIG. It is a figure which shows a 1st inner lens, Comprising: (a) is a front view, (b) is a rear view. FIG. 6 is a sectional view taken along line BB in FIG. It is the C section enlarged detail drawing of FIG. It is sectional drawing of the lamp proposed in patent document 1. FIG.

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

  1 is an exploded perspective view of a front side of a vehicular lamp according to the present invention, FIG. 2 is an exploded perspective view of a rear side of the vehicular lamp, FIG. 3 is a plan sectional view of the vehicular lamp, and FIG. FIG. 5 is a diagram showing the first inner lens, in which (a) is a front view, (b) is a rear view, and FIG. 6 is a sectional view taken along line BB in FIG. 5 (b). 7 is an enlarged detail view of a portion C in FIG.

  The vehicular lamp 1 according to the present embodiment is used as a DRL and a clearance lamp, and includes a combination headlamp housing disposed on the front left and right of the vehicle and a transparent outer lens covering the front opening thereof. The lamp chamber is defined together with a plurality of other lamps such as a high beam lamp, a low beam lamp, and a turn signal lamp. Since the basic configuration of the vehicular lamp 1 provided in the left and right combination headlamps is the same, only one will be illustrated and described below.

  As shown in FIGS. 1 to 3, the vehicular lamp 1 used as a DRL and a clearance lamp includes an LED socket 4 that holds an LED 2 that is a light source and a substrate 3 on which the LED 2 is mounted, and a light emitting direction from the LED 2. A first inner lens 5 and a second inner lens 6 are provided. The LED socket 4 also serves as a heat sink with high heat dissipation.

  The first inner lens 5 and the second inner lens 6 are each formed into a hexagonal plate shape with a transparent resin such as acrylic or polycarbonate having high light guiding properties. Here, at the center of the back surface of the first inner lens 5 on the side facing the LED 2, as shown in FIGS. 3 and 6, the arc-convex curved incident surface 5a centered on the optical axis AX, and A planar incident surface 5b formed around the incident surface 5a and an arc-shaped curved reflecting surface 5c continuous from the periphery of the tip of the incident surface 5b are formed.

  In addition, a pentagonal pyramid-shaped recess 5d (see FIG. 5A) that opens toward the front of the vehicle (upward in FIGS. 3 and 6) is formed at the center of the front surface of the first inner lens 5. The inner surface (five 45 ° slopes) of the recess 5 b constitutes the first reflecting surface 7.

  By the way, as shown in FIG. 5B, step-like second reflecting surfaces 8 are formed at five locations around the optical axis AX at the center of the back surface of the first inner lens 5, respectively. Here, each sectional structure of the second reflecting surface 8 is shown in FIG. 3 and FIG. 4 in FIG. 6, and each second reflecting surface 8 has a plurality of slopes of 45 ° as shown in FIG. It divides | segments into the division piece 8a, the adjacent division pieces 8a are respectively connected by the horizontal plane 8b, and the some division piece 8a and the some plane 8b which connects these are arrange | positioned at step shape. And in each 2nd reflective surface 8, as shown in FIG. 7, each divided piece 8a divided | segmented into plurality is made into the convex R shape (convex curved surface shape). By making each divided piece 8 a of the second reflecting surface 8 into a convex R shape (convex curved surface shape), the light from the first reflecting surface 7 of the first inner lens 5 is spread and secondly sent to the inner lens 6. Therefore, the emission surface of the second inner lens 6 emits light uniformly.

  On the other hand, five locations in front of the second inner lens 6 disposed in front of the first inner lens 5 (five locations corresponding to the second reflecting surface 8 formed at the five locations of the first inner lens 5). As shown in FIG. 1, a convex light diffusing portion 6A is integrally protruded forward. Here, as shown in FIG. 3 and FIG. 4, the exit surface 6a on the surface of each light diffusion portion 6A has a convex curved surface so that the light exiting from this diffuses.

  In the vehicular lamp 1 configured as described above, when a current is supplied from a power source (not shown) such as a battery to the LED 2 via the substrate 3 and the LED 2 emits light, the light is emitted forward. And the light radiate | emitted ahead from LED2 injects into the said 1st inner lens 5 from the entrance surfaces 5a and 5b of the 1st inner lens 5, as shown in FIG.3 and FIG.6, and the entrance surface The light incident from 5b is reflected by the reflecting surface 5c and travels toward the concave portion 5d as parallel light parallel to the optical axis AX together with the light incident from the incident surface 5a. And the light which goes to the recessed part 5d of the 1st inner lens 5 is reflected in the five 1st reflective surfaces 7 formed in this recessed part 5d, and the advancing direction is changed 90 degrees, and it shows in FIG.3 and FIG.6. In this way, the first inner lens 5 travels outward in the horizontal direction orthogonal to the optical axis AX. That is, the light reflected by the five first reflecting surfaces 7 travels horizontally toward the second reflecting surfaces 8 in the five directions shown in FIG.

  Thus, the light in the horizontal direction toward the second reflecting surface 8 formed at the five locations of the first inner lens 5 is reflected by the divided pieces 8a of the second reflecting surfaces 8 and the traveling direction thereof is changed. The light is changed by 90 °, becomes light parallel to the optical axis AX, is emitted from five locations of the first inner lens 5 (5 locations where the second reflecting surface 8 is formed), and is directed to the second inner lens 6 ahead. Incident. Thus, the light incident on the second inner lens 6 is emitted from the convex-curved exit surface 6a of the light diffusion portion 6A projecting at five locations where the light of the second inner lens 6 enters. In order to diffuse, in the vehicular lamp 1, the five convex light diffusion portions 6A protruding from the second inner lens 6 emit light, and the vehicular lamp 1 functions as a DRL and a clearance lamp.

  As described above, according to the vehicular lamp 1 according to the present embodiment, the second reflecting surface 8 of the first inner lens 5 that reflects light in a direction parallel to the optical axis AX is formed into a plurality of divided pieces 8a. Since the divided pieces 8a are divided and connected to each other by a plane 8b orthogonal to the optical axis AX, the thickness of the first inner lens 5 is suppressed and the second reflecting surface 8 of the first inner lens 5 is reflected. The range of light to be emitted can be expanded to the region R1 shown in FIG. 4, and as a result, light emission in a wide range is possible. Incidentally, in the inner lens 5 having the same thickness, when the second reflecting surface 8 ′ is a 45 ° cut surface indicated by a broken line in FIG. 4, the range of light reflected by the second reflecting surface 8 ′ is shown in the figure. Region R2 becomes significantly narrower than region R1 (R2 <R1).

  By the way, although the range S (see FIG. 7) of the plane 8b that connects the divided pieces 8a of the second reflecting surface 8 of the first inner lens 5 does not originally emit light, in the present embodiment, as shown in FIG. Furthermore, since each divided piece 8a has a convex R shape, the light reflected by each divided piece 8a can be reflected and diffused in various directions. For this reason, not only each division piece 8a but the plane part 8b can be light-emitted, the stripe | line-like nonuniformity by the part which does not light-emit can be eliminated, and a light emission surface can be light-emitted uniformly.

  In the present embodiment, the light emitted from the first inner lens 5 is diffused by the light diffusion portion 6A formed on the second inner lens 6, so that the light emitting surface can emit light more uniformly. The effect that it can be obtained.

  Although the present invention has been described with respect to a form in which the present invention is applied to a vehicle lamp used as a DRL and a clearance lamp, the present invention is not limited to other stop lamps, turn signal lamps, position lamps, and the like having an inner lens. Of course, the present invention can be similarly applied to any vehicle lamp.

1 Vehicle lamp 2 LED (light source)
DESCRIPTION OF SYMBOLS 3 Board | substrate 4 LED socket 5 1st inner lens 5a, 5b Incidence surface of 1st inner lens 5c Reflective surface of 1st inner lens 5d Recessed part of 1st inner lens 6 2nd inner lens 6A 2nd inner Lens light diffusion portion 6a Output surface of second inner lens 7 First reflection surface of first inner lens 8 Second reflection surface of first inner lens 8a Split piece of second reflection surface 8b of second reflection surface Plane AX Optical axis R1, R2 Light emitting area

Claims (3)

A vehicle including a first reflection surface that reflects light incident from a light source in a direction orthogonal to the optical axis and an inner lens formed with a second reflection surface that reflects light reflected by the first reflection surface in the optical axis direction. In the lighting equipment,
A vehicular lamp characterized in that the second reflecting surface of the inner lens is divided into a plurality of divided pieces, the adjacent divided pieces are connected by a plane orthogonal to the optical axis, and these are arranged stepwise.   The vehicular lamp according to claim 1, wherein each of the divided pieces of the second reflecting surface has a convex R shape. 2. The second inner lens is disposed in front of the inner lens in the light emitting direction, and a light diffusing portion for diffusing light emitted from the inner lens is formed in the second inner lens. Or the vehicle lamp of 2.

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