JP2015138594A - vehicle lamp - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lamp capable of ensuring uniform light emission as a whole even if an inner lens is inclined with respect to a plane orthogonal to a vehicle front-back direction.SOLUTION: A rear combination lamp (vehicle lamp) 1 is configured so that an LED 8 the optical axis x of which is inclined with respect to a front-back direction of a vehicle, a reflector 9 reflecting light from the LED 8 in the front-back direction of the vehicle, and an inner lens 10 inclined with respect to a plane orthogonal to the front-back direction of the vehicle are accommodated in a lamp chamber 3 defined by a housing 2 and an outer lens covering an opening of the housing 2. The rear combination lamp 1 uses fish-eye cuts 11 formed in the inner lens 10 to diffuse the light transmitted by the inner lens 11. The fish-eye cuts 11 formed in the inner lens 10 is inclined in an opposite direction to an inclination direction of the inner lens 10.

Description

  The present invention relates to a vehicular lamp that diffuses light passing through an inner lens by a fish-eye cut applied to the inner lens.

  As a light source for a vehicular lamp such as a headlamp or a rear combination lamp, an LED (light emitting diode) that is power-saving, has high luminance, and has a long life is being used. While the LED has the above-mentioned features, the light emitted from it has a strong directivity, and thus it is necessary to devise a technique for realizing uniform light emission over a wide area. As an example, a fish-eye cut is performed on an inner lens (see, for example, Patent Documents 1 and 2).

JP-A-1-120703 JP 2010-287397 A

  By the way, in an actual vehicle lamp, as shown in the cross-sectional plan view of the main part in FIG. 4, the substrate 107 on which the LED 108 is mounted and the inner lens 110 are in a plane perpendicular to the vehicle longitudinal direction due to the vehicle design. In such a case, the light emitted from the LED 108 is reflected by the reflector 109 so as to be directed in the vehicle front-rear direction.

  However, the light reflected by the reflector 109 and traveling in the vehicle front-rear direction is obliquely incident on the inner lens 110, so that the light diffused by the fish-eye cut 111 applied to the surface of the inner lens 110 is the vehicle front-rear direction. However, the light is not spread evenly in a well-balanced manner, but is biased toward the left or right side (left side in FIG. 4). For this reason, the problem that the whole vehicle lamp does not emit light uniformly occurs.

  The present invention has been made in view of the above problems, and the object of the present invention is to provide a vehicular lamp that emits light uniformly even when the inner lens is inclined with respect to a plane orthogonal to the vehicle longitudinal direction. There is to do.

  In order to achieve the above object, an invention according to claim 1 includes: an LED having an optical axis inclined with respect to the vehicle longitudinal direction; and an LED formed by an outer lens covering the opening of the housing and the LED. A reflector that reflects light in the vehicle front-rear direction and an inner lens that is inclined with respect to a plane orthogonal to the vehicle front-rear direction are accommodated, and the inner lens is transmitted by a fish-eye cut applied to the inner lens. In the vehicular lamp for diffusing the light to be emitted, the fish-eye cut applied to the inner lens is inclined in a direction opposite to the inclination direction of the inner lens.

  The invention according to claim 2 is characterized in that, in the invention according to claim 1, the inclination angle of the fish-eye cut is set to the same value as the inclination angle of the inner lens.

  According to the first aspect of the present invention, the light emitted from the LED whose optical axis is inclined with respect to the vehicle longitudinal direction is reflected by the reflector toward the vehicle longitudinal direction, and the reflected light is obliquely incident on the inner lens. Even in such a case, the fish-eye cut applied to the inner lens is inclined in the direction opposite to the inclination direction of the inner lens, so that the light transmitted through the inner lens is biased to the left and right by the fish-eye cut. It is diffused in a well-balanced manner, and the entire vehicle lamp emits light uniformly.

  According to the invention described in claim 2, by setting the inclination angle of the fish-eye cut applied to the inner lens to the same value as the inclination angle of the inner lens, the light transmitted through the inner lens is changed to the left and right by the fish-eye cut. It can be diffused in a more balanced manner without being biased.

1 is a front view of a vehicular lamp according to the present invention. It is the A section enlarged detail drawing of FIG. It is a plane sectional view of the vehicular lamp principal part concerning the present invention. 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 front view of a vehicular lamp according to the present invention, FIG. 2 is an enlarged detail view of a portion A in FIG. 1, and FIG. 3 is a plan sectional view of the main part of the vehicular lamp according to the present invention. The vehicular lamp 1 is a rear combination lamp provided on the left and right of the rear part of the vehicle. FIG. 1 shows only one of the pair of left and right rear combination lamps 1 (left side as viewed from the rear of the vehicle), but the basic configuration of the other (right side as viewed from the rear of the vehicle) is the same. Therefore, illustration and description thereof are omitted.

  A rear combination lamp 1 according to the present embodiment includes a tail lamp 4 and a stop lamp 5 shown in FIG. 1 as a lamp unit in a lamp chamber 3 defined by an outer lens (not shown) that covers a housing 2 and an opening thereof. The turn signal lamp 6 is accommodated.

  Here, the tail lamp 4 has a unit 4A elongated in the left-right direction disposed above, and extends downward from the outer end (left end in FIG. 1) of the elongated unit 4A toward the inside (right side in FIG. 1). And a wide unit 4B bent in a circular arc shape, and the wide unit 4B is configured as shown in FIG.

  That is, the wide unit 4B includes a board 7 inclined by an angle α shown in the figure with respect to a plane orthogonal to the vehicle front-rear direction, an LED 8 mounted on the board 7, and the LED 8 And a reflector 9 that reflects the light toward the rear of the vehicle (downward in FIG. 3) and an inner lens 10 that is inclined by an angle β shown in the figure with respect to a plane orthogonal to the vehicle longitudinal direction. Therefore, the optical axis x of the LED 8 mounted on the substrate 7 inclined by the angle α with respect to the plane orthogonal to the vehicle longitudinal direction is inclined by the angle α with respect to the vehicle longitudinal direction.

  The surface of the inner lens 10 is provided with a number of fish-eye cuts 11 (see FIGS. 2 and 3) for light distribution control. In this embodiment, as shown in FIG. Each fish-eye cut is inclined in the direction opposite to the inclination direction of the inner lens 10 by the same angle as the inclination angle β of the inner lens. Specifically, each fisheye cut 11 is formed by a wedge-shaped base 11a (in fact, the base 11a is integrally formed with the fisheye cut 11) inclined by an angle β shown in FIG. It can be considered that it is inclined by the same angle as the inclination angle β of the inner lens in the direction opposite to the inclination direction.

  Thus, when the LED 8 is activated and emits light in the wide unit 4B of the tail lamp 4, the light is reflected toward the rear of the vehicle by the reflector 9, as shown in FIG. The reflector 9 is designed to reflect the light emitted from the LED 8 toward the rear of the vehicle.

  Then, the light (reflected light) reflected by the reflector 9 toward the rear of the vehicle is incident obliquely on the inner lens 10 as shown in FIG. 3, but even in such a case, the inner lens Since the fish-eye cut 11 applied to the surface is inclined in the direction opposite to the inclination direction of the inner lens 10 as described above, the light transmitted through the inner lens 10 is biased left and right by each fish-eye cut 11. The light is diffused in a well-balanced manner without approaching, and the entire unit 4B having the wide tail lamp 4 emits light uniformly. In particular, in this embodiment, since the inclination angle of the fisheye cut 11 applied to the inner lens 10 is set to the same value as the inclination angle β of the inner lens 10, the light transmitted through the inner lens 10 is transmitted by the fisheye cut 11. Diffusion can be performed in a more balanced manner without biasing to the left and right.

  Although the present invention has been described with respect to a form in which the present invention is applied to a rear combination lamp, the present invention is of course applicable to any other vehicle lamp other than a rear combination lamp. It is.

DESCRIPTION OF SYMBOLS 1 Rear combination lamp 2 Housing 3 Lamp chamber 4 Tail lamp 4A Narrow unit of tail lamp 4B Wide unit of tail lamp 5 Stop lamp 6 Turn signal lamp 7 Substrate 8 LED
9 Reflector 10 Inner lens 11 Fisheye cut x LED optical axis α Tilt angle of LED optical axis (substrate) β Tilt angle of fisheye cut (inner lens)

Claims (2)

An LED whose optical axis is inclined with respect to the vehicle longitudinal direction, a reflector that reflects the light from the LED toward the vehicle longitudinal direction, and a vehicle longitudinal direction, which are defined by a housing and an outer lens that covers the opening of the housing In a vehicle lamp configured to accommodate an inner lens that is inclined with respect to a surface orthogonal to a direction, and to diffuse light transmitted through the inner lens by a fish-eye cut applied to the inner lens,
A vehicular lamp characterized in that the fish-eye cut made on the inner lens is inclined in a direction opposite to the inclination direction of the inner lens. The vehicular lamp according to claim 1, wherein an inclination angle of the fish-eye cut is set to the same value as an inclination angle of the inner lens.

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