JP2019139932A - Lighting appliance for vehicle - Google Patents

Abstract

To provide a lighting appliance for a vehicle which can enhance visibility from an oblique lateral direction by enabling homogeneous light emission to all directions except for a rear side, and can prevent the lowering of beauty at non-lighting.SOLUTION: In a position lamp (lighting appliance for a vehicle) 10, an LED (light source) 12 and a light guide lens 11 in which a lens cut 13 is formed at an anti-light emission face are accommodated in a lamp chamber 4 which is defined by a housing 2 and an outer lens 3 covering an opening part of the housing, and the light guide lens 11 is made to emit light by reflecting the light by the lens cut 13, and emitting it from a light emitting face 11b in a process for guiding light which is made incident to the light guide lens 11 from the LED 12 to a longitudinal direction of the light guide lens 11. A cross-section trapezoidal notched-groove shape recess 11c is formed at the anti-light emission face of the light guide lens 11, and the lens cut 13 is formed at an internal peripheral face of the recess 11c as a whole including both inside faces. An external peripheral face of a region except for the recess 11c of the light guide lens 11 is formed into a cylindrical face.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a vehicular lamp including a light guide lens that emits light by light from a light source.

  For example, a vehicular lamp such as a tail lamp or a position lamp includes a light guide lens that emits light by reflecting light incident from a light source such as an LED (light emitting diode) in the longitudinal direction and emitting the light from an emission surface. There are some, and a lens cut for reflection is continuously formed along the longitudinal direction on the light-exiting surface of the light guide lens of the vehicular lamp.

  By the way, in a vehicular lamp provided with a light guide lens, the light distribution is normally controlled so that strong light is emitted in the front direction of the light guide lens. Not very diffused. For this reason, when a pedestrian or the like views the light guide lens from a direction other than the front, the light guide lens looks dark, and the visibility of the vehicular lamp including the light guide lens may be reduced.

  Therefore, Patent Document 1 proposes a vehicular lamp shown in FIG.

  That is, FIG. 6 is a longitudinal sectional view of the vehicle lamp proposed in Patent Document 1, and the illustrated vehicle lamp 110 is used as a clear lamp and covers the housing 102 and its opening. In the lamp chamber 104 defined by the transparent inner lens 103, an LED (not shown) that is a light source and a round bar-shaped light guide lens 111 that emits light by light from the LED are accommodated.

  The light guide lens 111 is long in the direction perpendicular to the paper surface of FIG. 6, and an LED is disposed so as to face an incident surface (not shown) at one end in the longitudinal direction. A plurality of steps 113 are formed along the longitudinal direction on the back surface of the light guide lens 111 opposite to the exit surface 111a. Further, a part of the outer peripheral surface different from the back surface (counter-exit surface) on which the light exit surface 111 a and the step 113 of the light guide lens 111 are formed is a part of the light traveling in the light guide lens 111. The light emitting surface 111b emits toward the outside, and the light emitting surface 111b is subjected to a roughening process such as embossing.

  Thus, in the vehicular lamp 110 configured as described above, light emitted from an LED (not shown) enters the inside of the light guide lens 111 from an incident surface at one end in the longitudinal direction of the light guide lens 111. In the process of proceeding along the longitudinal direction of the light guide lens 111 while repeating total reflection inside the light guide lens 111, the light is reflected toward the emission surface 111a by the step 113 formed in the light guide lens 111, and FIG. As shown by L1 and L2, the light exits from the exit surface 111a, passes through the transparent inner lens 103, and is irradiated forward of the vehicle (left side in FIG. 6).

  Further, a part of the light traveling inside the light guide lens 111 along the longitudinal direction is emitted to the outside from the light emitting surface 111b of the light guide lens 111, and a part thereof is shown by L3 and L4 in FIG. As shown in the figure, the light is reflected by the first reflecting portion 102a and the second reflecting portion 102b formed on the inner surface of the housing 102, passes through the transparent inner lens 103, and is irradiated upward.

  Therefore, according to the illustrated vehicular lamp 110, light can be irradiated not only in the front direction but also in the upper direction, so that visibility from the upper direction is improved.

JP2013-191212A

  However, in the vehicle lamp 110 shown in FIG. 6 proposed in Patent Document 1, light is not emitted obliquely in the lateral direction from the light guide lens 111, so uniform light emission in all directions is not realized, and the oblique lateral direction There is a problem that visibility is poor. Further, since the step 113 formed on the back surface (opposite exit surface) of the light guide lens 111 is exposed to the outside, the step 113 is directly visible from the outside when not lit, and when the vehicle lamp 110 is not lit. There is also a problem that the aesthetics of the are impaired.

  The present invention has been made in view of the above problems, and the object of the present invention is to realize uniform light emission in all directions except for the rear to improve visibility from an oblique lateral direction and to turn off the light. An object of the present invention is to provide a vehicular lamp that can prevent a decrease in the beauty of time.

  In order to achieve the above object, according to the first aspect of the present invention, a light source and a light guide lens in which a lens cut is formed on the light-exiting surface are accommodated in a lamp chamber defined by an outer lens covering the housing and the opening. A vehicle that causes the light guide lens to emit light by reflecting the light incident on the light guide lens from the light source in the longitudinal direction of the light guide lens in the process of reflecting the light by the lens cut and emitting it from the exit surface. In the lamp for lighting, characterized in that a recess having a trapezoidal cross section in a trapezoidal cross section is formed on the light exit surface of the light guide lens, and the lens cut is formed on the entire inner peripheral surface including both inner side surfaces of the recess. To do.

  According to a second aspect of the present invention, in the first aspect of the present invention, the outer peripheral surface of the light guide lens excluding the concave portion is a cylindrical surface.

  According to the first aspect of the present invention, since the lens cut is formed on the entire inner peripheral surface including both inner surfaces of the concave portion of the trapezoidal cross section formed on the opposite exit surface of the light guide lens, the front and vertical directions excluding the rear In addition, the light guide lens can emit light uniformly in all directions including the oblique lateral direction. In addition, since the lens cut is formed in the concave portion formed on the light exit surface of the light guide lens, the lens cut is not exposed to the outside of the light guide lens, and the lens cut may be directly visible from the outside when not lit. Absent. For this reason, the beauty | look at the time of the non-lighting of the vehicle lamp is not impaired by a lens cut.

  According to the second aspect of the present invention, since the outer peripheral surface of the portion excluding the concave portion of the light guide lens is a cylindrical surface, light is broad from the cylindrical surface except the counter-emitting surface (back surface) where the concave portion of the light guide lens is formed. The light is emitted uniformly over the range, and even with a small range of lens cuts, the lens cut is enlarged and projected onto the surface of the light guide lens by the magnifying glass (convex lens) effect by the cylindrical surface, and the entire light guide lens Appears to emit light uniformly.

It is a front view of a front combination lamp provided with the vehicular lamp concerning the present invention. It is the sectional view on the AA line of FIG. It is a front view of the light guide lens of the vehicular lamp according to the present invention. FIG. 4 is a sectional view taken along line BB in FIG. 3. It is a cross-sectional view of a light guide lens showing a comparative example with the present invention. It is a longitudinal cross-sectional view of the vehicle lamp proposed in Patent Document 1.

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

  1 is a front view of a front combination lamp including a vehicular lamp according to the present invention, FIG. 2 is a cross-sectional view taken along line AA in FIG. 1, FIG. 3 is a front view of a light guide lens, and FIG. 1 is a sectional view taken on line B, and the front combination lamp 1 shown in FIG. 1 is arranged on the left and right of the front part of the motorcycle, and its basic configuration is the same on the left and right. Only 1 is shown and described.

  As shown in FIGS. 1 and 2, the front combination lamp 1 accommodates a turn signal lamp 5 in an upper part of a lamp chamber 4 defined by a housing 2 and a transparent outer lens 3 covering a front opening thereof. A position lamp 10 according to the present invention is accommodated below the turn signal lamp 5. As shown in FIG. 2, an extension 6 for covering a gap around the turn signal lamp 5 and the position lamp 10 is arranged in the lamp chamber 4.

  The housing 2 is integrally formed of a light-impermeable resin, and the outer lens 3 is integrally formed of a light-transmitting transparent resin in a concave groove 2a formed over the entire periphery of the outer periphery. The lamp chamber 4 is defined between the two by fitting the peripheral leg portion 3a and fixing the fitting portion with an adhesive (not shown) such as hot melt.

  By the way, the position lamp 10 according to the present invention is disposed so as to face a round bar-shaped light guide lens 11 that is bent in a letter-like shape when viewed from the front, and a hemispherical incident surface 11 a of the light guide lens 11. LED 12 is provided as a light source. Here, the light guide lens 11 is integrally formed of a transparent resin such as acrylic or polycarbonate having a high light guide property, and as shown in FIG. 4, the front side surface constitutes an emission surface 11b. In addition, a recess 11c having a notch groove shape having a trapezoidal cross section is formed along the longitudinal direction (perpendicular to the plane of FIG. 4) on the back surface (opposite surface) of the light guide lens 11, and the plane of the recess 11c. The lens cut 13 is continuously formed along the longitudinal direction on the entire inner peripheral surface including the upper surface and the inclined inner surfaces on both sides thereof.

  And the outer peripheral surface of the site | part except the back surface in which the recessed part 11c of the light guide lens 11 was formed is made into a cylindrical surface, as shown in FIG.

  Thus, in the position lamp 10 configured as described above, when current is supplied to the LED 12 from a power source (not shown) such as a battery and the LED 12 emits light, the light is incident on the incident surface at the upper end of the light guide lens 11. The light enters the light guide lens 11 from 11a. Then, the light incident on the inside of the light guide lens 11 travels through the inside of the light guide lens 11 from the upper end side toward the lower end side while repeating total reflection. ) Are reflected by the lens cuts 13 formed on the entire inner peripheral surface of the recess 11c, and are directed toward the exit surface 11b in a wide range of the angle α excluding the recess 11c of the light guide lens 11 as indicated by arrows in FIG. Then, the light exits from the cylindrical exit surface 11b. And the light radiate | emitted from the output surface 11b of the light guide lens 11 passes the transparent outer lens 3 shown in FIG. 2, and is irradiated to the vehicle front (left side of FIG. 2). For this reason, the entire light guide lens 11 emits light uniformly in the position lamp 10.

  As described above, in the present embodiment, since the lens cut 13 is formed on the entire inner peripheral surface including both inner side surfaces of the recess 11c having a trapezoidal cross section formed on the back surface (counter-emission surface) of the light guide lens 11, the rear The light guide lens 11 can emit light uniformly in all directions including the front and up and down directions and the oblique horizontal direction except for the position lamp 10, and visibility of the position lamp 10 from all directions including the oblique horizontal direction is enhanced.

  Further, since the lens cut 13 is formed in the concave portion 11c formed on the back surface (opposite exit surface) of the light guide lens 11, the lens cut 13 is not exposed to the outside of the light guide lens 11, and the lens cut 13 It is not visible directly from the outside when not lit. For this reason, the aesthetic appearance when the position lamp 10 is not lit is not impaired by the lens cut 13.

  Further, in the present embodiment, since the outer peripheral surface of the portion of the light guide lens 11 excluding the concave portion 11c is a cylindrical surface, light is emitted from the cylindrical surface excluding the counter-emitting surface (back surface) where the concave portion 11c of the light guide lens 11 is formed. 4 uniformly emits over a wide range of the angle α shown in FIG. 4, and even if the lens cut 13 is in a small range, the lens cut 13 is brought into the surface of the light guide lens 11 by the magnifying glass (convex lens) effect by the cylindrical surface. The entire light guide lens 11 appears to emit light uniformly. Incidentally, the outer periphery of the portion of the light guide lens 11 excluding the back surface (counter-emission surface) where the concave portion 11c is formed is not a cylindrical surface but adjacent to the concave portion 11c of the light guide lens 11 as shown in the cross-sectional view of FIG. When the left and right portions to be formed are flat slopes 11d cut obliquely, the light can be reflected only within a narrow angle range β shown in the figure by the lens cut 13 formed in the recess 11c. 11 cannot emit light uniformly.

  In the above description, the present invention is applied to the position lamps provided on the front combination lamps disposed on the left and right of the front part of the motorcycle. However, the present invention is provided in other vehicles including automobiles. Of course, the present invention can be similarly applied to other arbitrary vehicle lamps such as a headlamp, a rear combination lamp, a high-mount stop lamp, and a DRL (Day Running Lamp).

DESCRIPTION OF SYMBOLS 1 Front combination lamp 2 Housing 3 Outer lens 4 Light chamber 5 Turn signal lamp 6 Extension 10 Position lamp (vehicle lamp)
DESCRIPTION OF SYMBOLS 11 Light guide lens 11a Light entrance lens entrance surface 11b Light guide lens exit surface 11c Light guide lens recess 12 LED (light source)
13 Lens cut

Claims (2)

A light source and a light guide lens in which a lens cut is formed on the non-emission surface are accommodated in a lamp chamber defined by an outer lens that covers the housing and its opening, and light that enters the light guide lens from the light source is received. In the vehicular lamp that emits light from the light guide lens by reflecting the light by the lens cut in the process of guiding the light guide lens in the longitudinal direction and emitting the light from the exit surface,
A vehicular lamp characterized in that a notch groove-like recess having a trapezoidal cross section is formed on the light emitting surface of the light guide lens, and the lens cut is formed on the entire inner peripheral surface including both inner side surfaces of the recess. . The vehicular lamp according to claim 1, wherein an outer peripheral surface of the light guide lens excluding the concave portion is a cylindrical surface.

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