JP2014060047A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem in a conventional vehicular lighting fixture that an optical component is increased in size.SOLUTION: A vehicular lighting fixture includes a lamp housing, a lamp lens, a semiconductor type light source 1, and a lens member 2. The lens member 2 has a first incident surface 21, a second incident surface 22, a first emission surface 23, a reflection surface 24, a second emission surface 25. As a result, since the angle formed between the second incident surface 22 and the reflection surface 24 can be close to about 90°, the lens member 2 can be reduced in size.

Description

  The present invention is a vehicular lamp including a semiconductor light source and a lens member. For example, a tail lamp, a stop lamp, a tail / stop lamp, a clearance lamp, a turn signal lamp, a rear fog lamp, a daytime running lamp, etc. This relates to a vehicular lamp.

  This type of vehicular lamp is conventionally known (for example, Patent Document 1). Hereinafter, a conventional vehicle lamp will be described. A conventional vehicle lamp includes a light source and an optical component, and the optical component includes a convex wall portion that forms a converging lens, a cylindrical wall portion, a center surface, a frustoconical rear surface, and a cone. And a trapezoidal front surface. Light from the central portion of the light source enters the optical component from the convex wall portion and exits from the central surface to the outside. The light from the side of the light source is incident on the optical component from the cylindrical wall, is reflected on the rear surface of the truncated cone, and is emitted to the outside from the front surface of the truncated cone. This acts as a predetermined lamp function.

JP 2003-281907 A

  However, the conventional vehicular lamp reflects light incident from a cylindrical wall portion perpendicularly to the measurement screen at the rear surface of the truncated cone. For this reason, in the conventional vehicular lamp, the angle formed by the cylindrical wall portion (surface) and the rear surface of the truncated cone is an acute angle, and the optical component tends to be enlarged.

  The problem to be solved by the present invention is that in the conventional vehicular lamp, the optical component tends to be enlarged.

  The present invention (the invention according to claim 1) includes a lamp housing and a lamp lens that define a lamp chamber, and a semiconductor-type light source and a lens member disposed in the lamp chamber, and the lens member is a semiconductor-type light source. A first incident surface that makes light emitted from the central portion incident as parallel light, a second incident surface that makes light emitted from a side portion of the semiconductor-type light source incident as parallel light, and a parallel light incident from the first incident surface A first emission surface that emits light as parallel light perpendicular to the measurement screen, a reflection surface that totally reflects parallel light incident from the second incident surface as parallel reflected light on the first emission surface side, and a reflection surface And a second emission surface that emits the totally reflected parallel reflected light as parallel light perpendicular to the measurement screen.

  In this invention (the invention according to claim 2), the first incident surface is a refracting surface of a rotating hyperboloid formed by rotating a hyperbola with a semiconductor-type light source as a focal point with the main axis of the hyperbola as a rotation axis. The incident surface is a refracting surface obtained by rotating a hyperbola with a semiconductor light source as a focal point about the rotation axis of the first incident surface, and the reflecting surface is a rotation axis about the rotation axis of the first incident surface. It is characterized by being a reflecting surface that is rotated as follows.

  In the present invention (the invention according to claim 3), the distance from the apex of the hyperbola that forms the first incident surface to the semiconductor-type light source is greater than the distance from the apex of the hyperbola that forms the second incident surface to the semiconductor-type light source. It is small.

  The present invention (the invention according to claim 4) is characterized in that a diffusing portion for diffusing parallel light is provided on a part of at least one of the first emission surface and the second emission surface. And

  In the vehicular lamp of the present invention, the parallel light incident from the second incident surface is totally reflected by the reflecting surface as the parallel reflected light to the first emitting surface side, and the parallel reflected light totally reflected by the reflecting surface is emitted second. The light is emitted as parallel light perpendicular to the measurement screen from the surface. For this reason, in the vehicular lamp according to the present invention, the angle formed by the second incident surface and the reflecting surface can be brought close to about 90 °, so that the lens member can be made smaller than the conventional vehicular lamp. .

FIG. 1 is a front view of a semiconductor light source and a lens member (a front view seen from the lens member) showing an embodiment of a vehicular lamp according to the present invention. 2 is a cross-sectional view taken along line II-II in FIG. FIG. 3 is an explanatory diagram illustrating a first incident surface, a second incident surface, a first exit surface, a reflection surface, and a second exit surface of the lens member. FIG. 4 is an explanatory diagram showing an optical path in the lens member. FIG. 5 is an explanatory diagram showing a relative relationship between the distance between the first incident surface of the lens member and the semiconductor light source and the distance between the second incident surface and the semiconductor light source. FIG. 6 is an explanatory view showing a first emission surface and a second emission surface, that is, a light emitting surface of the lens member.

  DESCRIPTION OF EMBODIMENTS Embodiments (examples) of a vehicular lamp according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In the description of the claims, “parallel” defines “parallel or substantially parallel”, and “vertical” defines “vertical or substantially vertical”.

(Description of Configuration of Embodiment)
Hereinafter, the configuration of the vehicular lamp in this embodiment will be described. The vehicular lamp of this embodiment includes a lamp housing (not shown) and a lamp lens (not shown) that define a lamp chamber (not shown), a semiconductor light source 1 and a lens member that are arranged in the lamp chamber. 2 is provided.

  In this example, the semiconductor light source 1 and the lens member 2 constitute a lamp unit of a tail lamp. The semiconductor light source 1 and the lamp unit of the tail lamp of the lens member 2 are arranged in one or more units in the lamp chamber. The lamp units of the tail lamps of the semiconductor-type light source 1 and the lens member 2 constitute a rear combination lamp together with the lamp units of other functions. The rear combination lamps are mounted on both the left and right sides of the rear portion of the vehicle (not shown).

(Description of the semiconductor-type light source 1)
In this example, the semiconductor light source 1 is a self-luminous semiconductor light source such as an LED or an EL (organic EL). The semiconductor-type light source 1 has a package structure in which a light emitting chip (LED chip) 11 is sealed with a sealing resin member. The semiconductor light source 1 is mounted on a substrate 10 as shown in FIG. The substrate 10 is attached to the lamp housing via an attachment member or the like (not shown). The semiconductor light source 1 is supplied with power through the substrate 10. As shown in FIG. 4, the lights L1 and L3 from the light emitting chip 11 of the semiconductor-type light source 1 have a wide hemispherical shape (a solid angle with the light emitting chip 11 as a point (corner apex) is about 180 °). Radiated.

(Description of the lens member 2)
As shown in FIG. 1, the lens member 2 has a circular shape when viewed from the front (a shape when the rear part of the vehicle is viewed from the rear of the vehicle), and a cross-sectional shape as shown in FIG. The surface (upper surface) on the exit surface side forms a toroidal inclined surface having a downward slope from the periphery to the center, and forms a cup shape that forms a circular flat bottom surface in the center. In this example, the lens member 2 is made of a transparent resin material such as PC (polycarbonate) or PMMA (polymethyl methacrylate, methacrylic resin). The lens member 2 is attached to the lamp housing via an attachment member or the like (not shown). That is, the semiconductor-type light source 1 and the lens member 2 are attached to the lamp housing in a state where the relative attachment position is maintained.

  The lens member 2 includes a first incident surface 21, a second incident surface 22, a first exit surface 23, a reflection surface 24, and a second exit surface 25.

  The first incident surface 21 is emitted from the central portion of the light emitting chip 11 of the semiconductor light source 1 (the central portion having a solid angle of about 80 ° with the light emitting chip 11 as a point (corner apex)). This is a surface on which L1 is incident as parallel light or substantially parallel light (hereinafter simply referred to as “parallel light”) L2. The parallel light L2 is parallel or substantially parallel to the optical axis O of the lens member 2. The first incident surface 21 is provided at the center of the surface of the lens member 2 facing the semiconductor light source 1. That is, the first incident surface 21 is provided corresponding to the central portion of the semiconductor light source 1. The first incident surface 21 rotates a hyperbola having the light emitting chip 11 of the semiconductor-type light source 1 or the vicinity thereof as a focal point F1 with the main axis of the hyperbola (the optical axis O of the lens member 2) as a rotation axis. It is a refracting surface of the rotating hyperboloid

  The second incident surface 22 is a side of the semiconductor light source 1 on the side of the light emitting chip 11 (a solid angle with the light emitting chip 11 as a point (corner apex) between about 80 ° and about 180 °). This is a surface on which the light L3 radiated from the light is incident as parallel light or substantially parallel light (hereinafter simply referred to as “parallel light”) L4. The second incident surface 22 is provided on the side of the surface of the lens member 2 that faces the semiconductor light source 1. In other words, the first incident surface 21 is provided at a central side portion of the first incident surface 21 corresponding to the side portion of the semiconductor light source 1. The second incident surface 22 is a refractive surface obtained by rotating a hyperbola having the light emitting chip 11 of the semiconductor-type light source 1 or the vicinity thereof as a focal point F2 with the rotation axis of the first incident surface 21 as a rotation axis. .

  As shown in FIG. 5, the distance T1 from the top of the hyperbola that forms the first incident surface 21 to the light emitting chip 11 of the semiconductor light source 1 is the top of the hyperbola that forms the second entrance surface 22. Is smaller than the distance T2 from the semiconductor light source 1 to the light emitting chip 11.

  The first exit surface 23 converts the parallel light L2 incident from the first entrance surface 21 into parallel light or substantially parallel light (hereinafter simply referred to as “parallel light”) perpendicular to or substantially perpendicular to a measurement screen (not shown). It is a surface to be emitted as L5. The parallel light L5 is parallel or substantially parallel to the optical axis O of the lens member 2. The first emission surface 23 is provided at the center of the surface of the lens member 2 opposite to the surface facing the semiconductor-type light source 1. That is, the first exit surface 23 is provided corresponding to the first entrance surface 21 and the central portion of the semiconductor-type light source 1. The first emission surface 23 is basically (basic) a surface that is horizontal or substantially horizontal to the optical axis O of the lens member 2. The first emission surface 23 has a circular shape centered on the optical axis O of the lens member 2.

  The reflection surface 24 converts the parallel light L4 incident from the second incidence surface 22 into parallel reflection light or substantially parallel reflection light (hereinafter simply referred to as “parallel reflection light”) L6, the first emission surface 21 side, That is, it is a surface that totally reflects toward the center of the lens member 2. The reflective surface 24 is provided on the outer side of the second incident surface 22 of the surface of the lens member 2 that faces the semiconductor light source 1. The reflection surface 24 is a reflection surface obtained by rotating a straight line about the rotation axis of the first incident surface 21 as a rotation axis. The straight line forming the reflection surface 24 is inclined from the center portion to the side portion of the lens member 2 from the second incident surface 22 side (lower side) to the second emission surface 25 side (upper side). . An angle formed by the straight line forming the reflecting surface 24 and the hyperbola forming the second incident surface 22 is close to about 90 °.

  The second exit surface 25 is configured to reflect the parallel reflected light L6 totally reflected by the reflecting surface 24 to parallel light or substantially parallel light (hereinafter simply referred to as “parallel light”) perpendicular to or substantially perpendicular to the measurement screen. This is the surface to be emitted as L7. The parallel light L7 is parallel or substantially parallel to the optical axis O of the lens member 2. The second emission surface 25 is provided on the outer side of the first emission surface 23 on the surface opposite to the surface of the lens member 2 facing the semiconductor light source 1. The second emission surface 25 is basically (base tone) inclined from the center to the side of the lens member 2 from the reflection surface 24 side (lower side) to the first emission surface 23 side (upper side). ). The second emission surface 25 has an annular shape centered on the optical axis O of the lens member 2.

  The first emission surface 23 and the second emission surface 25 are provided with diffusing portions 26 for diffusing the parallel lights L5 and L7, respectively. The diffusion unit 26 is composed of, for example, a fisheye prism.

  Here, the lights (the parallel lights L5 and L7) emitted from the first emission surface 23 and the second emission surface 25 of the lens member 2 are parallel or substantially perpendicular to the measurement screen or When the light is substantially parallel, light distribution control and light distribution design are facilitated.

(Description of the operation of the embodiment)
The vehicular lamp in this embodiment is configured as described above, and the operation thereof will be described below.

  The light emitting chip 11 of the semiconductor light source 1 is turned on. Then, the light L1 emitted from the central portion of the light emitting chip 11 of the semiconductor light source 1 is converted into parallel light L2 parallel to the optical axis O of the lens member 2 from the first incident surface 21 of the lens member 2 into the lens member 2. Incident. On the other hand, the light L3 emitted from the side portion of the light emitting chip 11 of the semiconductor light source 1 enters the lens member 2 from the second incident surface 22 of the lens member 2 as parallel light L4.

  The parallel light L2 incident on the lens member 2 from the first entrance surface 21 is parallel to the first exit surface 23 of the lens member 2 and perpendicular to the measurement screen and parallel to the optical axis O of the lens member 2. The light is emitted to the outside as light L5.

  On the other hand, the parallel light L4 incident on the lens member 2 from the second incident surface 22 is reflected on the reflecting surface 24 of the lens member 2 as the parallel reflected light L6 on the first emission surface 21 side, that is, on the central portion side of the lens member 2. Total reflection. The parallel reflected light L6 is emitted from the second emission surface 25 of the lens member 2 to the outside as parallel light L7 that is perpendicular to the measurement screen and parallel to the optical axis O of the lens member 2.

  The parallel lights L5 and L7 are emitted from the first emission surface 23 and the second emission surface 25 of the lens member 2 to the outside, so that the first emission is shown in the portion where the oblique lattice lines are given in FIG. The surface 23 emits light in a circular shape, while the second emission surface 25 emits light in an annular shape. In addition, when the parallel lights L5 and L7 are emitted from the first emission surface 23 and the second emission surface 25 of the lens member 2 to the outside, the diffusion portions 26 of the first emission surface 23 and the diffusion portions of the second emission surface 25 are used. 26 is diffused.

(Explanation of effect of embodiment)
The vehicular lamp in this embodiment has the configuration and operation as described above, and the effects thereof will be described below.

  In the vehicle lamp in this embodiment, the parallel light L4 incident from the second incident surface 22 is totally reflected by the reflecting surface 24 as the parallel reflected light L6 toward the first emitting surface 21, and is totally reflected by the reflecting surface 24. The parallel reflected light L6 is emitted from the second emission surface 25 as parallel light L7 perpendicular to the measurement screen. For this reason, in the vehicle lamp in this embodiment, the angle formed by the second incident surface 22 and the reflecting surface 24 can be made closer to about 90 °, so that the lens member 2 can be made smaller than the conventional vehicle lamp. can do.

  In the vehicular lamp in this embodiment, the reflecting surface 24 is a reflecting surface formed by rotating the reflecting surface 24 about a straight line about the rotation axis of the first incident surface 21. Compared with the reflective surface of the vehicular lamp, manufacturing and manufacturing management are easier.

  In the vehicle lamp in this embodiment, the distance T1 from the top of the hyperbola that forms the first incident surface 21 to the semiconductor-type light source 1 is the distance T2 from the top of the hyperbola that forms the second entrance surface 22 to the semiconductor-type light source 1. Smaller than. As a result, in the vehicular lamp in this embodiment, the hyperbola that forms the second incident surface 22 protrudes closer to the center of the lens member 2 than the hyperbola that forms the first incident surface 21, resulting in an undercut. There is nothing. Thereby, the vehicular lamp in this embodiment does not complicate the molding die of the lens member 2 and can reduce the manufacturing cost accordingly.

  In the vehicle lamp in this embodiment, the light diffusing unit 26 can arbitrarily control the light distribution of the parallel lights L5 and L7 emitted from the first emission surface 23 and the second emission surface 25 to the outside.

(Description of example other than embodiment)
In the above embodiment, the tail lamp of the rear combination lamp will be described. However, in the present invention, a vehicle lamp other than the rear combination lamp tail lamp, for example, a rear combination lamp stop lamp, tail stop lamp, turn signal lamp, clearance lamp, or front combination lamp clearance lamp, turn signal. It can also be applied to lamps and daytime running lamps.

  Further, in the above-described embodiment, the diffusing portion 26 is provided on the first emission surface 23 and the second emission surface 25. However, in the present invention, the diffusing portion 26 may be provided on either the first emission surface 23 or the second emission surface 25.

  Furthermore, in the above-described embodiment, the diffusing portion 26 is provided on the entire surface of the first emission surface 23 and the entire surface of the second emission surface 25. However, in the present invention, the diffusing portion 26 may be provided on a part of the first emission surface 23 and a part of the second emission surface 25.

DESCRIPTION OF SYMBOLS 1 Semiconductor type light source 10 Substrate 11 Light emitting chip 2 Lens member 21 1st entrance surface 22 2nd entrance surface 23 1st exit surface 24 Reflective surface 25 2nd exit surface 26 Diffusion part F1 Hyperbolic focus of 1st entrance surface F2 2nd Hyperbolic focal point of incident surface L1, L3 Light from semiconductor light source L2, L4 Parallel light incident on lens member L5, L7 Parallel light emitted from lens member L6 Parallel reflected light O Optical axis of lens member T1 First incident surface The distance from the top of the hyperbola to the semiconductor-type light source T2 The distance from the top of the hyperbola of the second incident surface to the semiconductor-type light source

Claims (4)

A lamp housing and a lamp lens that partition the lamp chamber;
A semiconductor-type light source and a lens member disposed in the lamp chamber;
With
The lens member is
A first incident surface on which light emitted from a central portion of the semiconductor-type light source is incident as parallel light;
A second incident surface on which light emitted from a side portion of the semiconductor-type light source is incident as parallel light;
A first exit surface for emitting the parallel light incident from the first entrance surface as parallel light perpendicular to the measurement screen;
A reflecting surface that totally reflects the parallel light incident from the second incident surface as parallel reflected light toward the first emitting surface;
A second emission surface for emitting the parallel reflected light totally reflected by the reflection surface as parallel light perpendicular to the measurement screen;
Having
A vehicular lamp characterized by the above. The first incident surface is a refracting surface of a rotating hyperboloid formed by rotating a hyperbola focusing on the semiconductor-type light source about the main axis of the hyperbola as a rotation axis;
The second incident surface is a refracting surface obtained by rotating a hyperbola with the semiconductor-type light source as a focal point about a rotation axis of the first incident surface,
The reflecting surface is a reflecting surface formed by rotating a straight line about the rotation axis of the first incident surface as a rotation axis.
The vehicular lamp according to claim 1. The distance from the apex of the hyperbola that forms the first incident surface to the semiconductor-type light source is smaller than the distance from the apex of the hyperbola that forms the second incident surface to the semiconductor-type light source,
The vehicular lamp according to claim 2. A diffusion part for diffusing the parallel light is provided on at least a part of either the first emission surface or the second emission surface.
The vehicular lamp according to any one of claims 1 to 3.

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