JP2006019051A - Vehicular lighting fixture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve problems that there is no flexibility for the lay-out design of respective constituting parts and no consideration for the heat radiating countermeasure of an LED in a conventional vehicular lighting fixture. <P>SOLUTION: The optical axis Z-Z of a first reflecting face 2 is slanted diagonally against the optical axis Z1-Z1 of a second reflecting face 3 of which the side view is nearly horizontal, the first reflecting face 2 is positioned at a diagonally lower front side against the second reflecting face 3, and an opening 12 for passing reflection light from the first reflection face 2 and direct light from an LED 6 to the second reflection face 3 is arranged between a reflecting face 2 and an LED 6 side and a second reflecting face 3 side. As a result, a freedom of the layout design of each constituting part becomes increasingly larger, and furthermore, a radiating effect of the LED is enhanced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicular lamp that uses an LED as a light source and has two reflecting surfaces. In particular, the present invention relates to a vehicular lamp that has a high degree of freedom in layout design of each component and is excellent in the heat dissipation effect of an LED.

  This type of vehicular lamp is conventionally known (for example, Patent Document 1). Hereinafter, the vehicle lamp will be described. In addition, the code | symbol with a parenthesis respond | corresponds to patent document 1, respectively. The vehicular lamp (10) includes a spheroidal second reflecting surface (4), a rotating parabolic third reflecting surface (5), and a first focal point (f1) of the second reflecting surface (4). LED lamp (2) disposed on the second reflecting surface (4), the optical axis (Y) of the second reflecting surface (4) is orthogonal to the optical axis (irradiation direction X1) of the third reflecting surface (5) To do. When the LED lamp (2) is turned on to emit light, the light from the LED lamp (2) is reflected by the second reflecting surface (4), and the reflected light reflected by the second reflecting surface (4) is third. The reflected light reflected by the reflecting surface (5) and reflected by the third reflecting surface (5) is irradiated to the outside with a predetermined light distribution pattern to illuminate the road surface and the like.

  However, in the conventional vehicular lamp, the optical axis (Y) of the second reflecting surface (4) is orthogonal to the optical axis (irradiation direction X1) of the third reflecting surface (5). Since the component parts are laid out with respect to the optical axis (Y) of the second reflecting surface (4) and the optical axis (irradiation direction X1) of the third reflecting surface (5), the layout design of each component part is free. There is no degree. Moreover, there is a problem that no consideration is given to LED heat dissipation measures.

JP 2001-332104 A

  The problem to be solved by the present invention is that the conventional vehicular lamp does not have a degree of freedom in designing the layout of each component, and does not consider LED heat dissipation measures.

  In the present invention, the optical axis of the first reflecting surface is inclined with respect to the optical axis of the second reflecting surface that is substantially horizontal when viewed from the side, and the first reflecting surface is inclined with respect to the second reflecting surface. In order to pass the reflected light from the first reflecting surface and the direct light from the LED through the second reflecting surface between the first reflecting surface and the LED side and the second reflecting surface side. The opening part is provided, It is characterized by the above-mentioned.

  In the vehicular lamp of the present invention, since the optical axis of the first reflecting surface is inclined obliquely with respect to the optical axis of the second reflecting surface, each component is inclined with respect to the optical axis of the first reflecting surface. Since the layout is made with respect to the optical axis of the second reflection surface, the layout of each component is adjusted by adjusting the degree of inclination between the optical axis of the first reflection surface and the optical axis of the second reflection surface that are inclined obliquely. Increased design freedom. Moreover, in the vehicular lamp of the present invention, the first reflecting surface is located obliquely below the second reflecting surface, and an opening is formed between the first reflecting surface and the LED side and the second reflecting surface side. Therefore, the heat generated by the LED can be efficiently discharged to the outside from the opening located above the LED by heat convection, and the heat dissipation effect of the LED is excellent.

  Embodiments of a vehicular lamp according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments. In the drawings, the symbol “F” indicates the front side of the vehicle (the forward direction side of the vehicle). The symbol “B” indicates the rear side of the vehicle. Reference sign “U” indicates an upper side of the front side as viewed from the driver side. The symbol “D” indicates the lower side when the front side is viewed from the driver side. The symbol “L” indicates the left side when the front side is viewed from the driver side. The symbol “R” indicates the right side when the front side is viewed from the driver side. The symbol “VU-VD” indicates vertical lines on the top and bottom of the screen. Reference sign “HL-HR” indicates horizontal lines on the left and right of the screen. The symbol “HH” indicates a horizontal axis and a traveling axis of the vehicle.

  Hereinafter, the configuration of the vehicular lamp in this embodiment will be described. In the figure, reference numeral 1 denotes a vehicle lamp in this embodiment. The vehicular lamp 1 includes a reflector 5 having a first reflecting surface 2, a second reflecting surface 3, and a shade 4, and an LED 6 as a light source.

  In the reflector 5, a first reflecting surface portion 7, a second reflecting surface portion 8, and a shade portion 9 are integrally formed through a plate portion 10 from a light-impermeable resin or the like.

  The first reflecting surface portion 7 has a shape in which a spheroid shape is divided into four in a major axis direction and a minor axis direction, and a first opening portion 11 in the major axis direction and a second opening portion 12 in the minor axis direction, Have The first reflecting surface 2 is formed on the concave inner surface of the first reflecting surface portion 7 by vapor deposition of aluminum or silver coating. The first reflecting surface 2 is composed of a reflecting surface based on an ellipse, such as a rotating ellipsoid or a free-form surface based on an ellipse. The optical axis ZZ of the second reflecting surface 3 is substantially horizontal when viewed from the side, as shown in the longitudinal sectional view (vertical sectional view) of FIG. It is inclined obliquely with respect to Z1. In this example, it is inclined about 45 °. The first reflecting surface 2 is located on the front side and obliquely below the second reflecting surface 3. Further, on the first reflecting surface 2, the first focal point F1 is located on the front side and obliquely below the second focal point F2. Furthermore, between the first reflecting surface 2 and the LED 6 side and the second reflecting surface 3 side, the reflected light from the first reflecting surface 2 and the direct light from the LED 3 are transmitted to the second reflecting surface. 3, that is, the second opening 12 is provided.

  The said 2nd reflective surface part 8 consists of a part of rotation parabola shape. The second reflective surface 3 is formed on the concave inner surface of the second reflective surface portion 8 by aluminum deposition or silver coating. The second reflecting surface 3 faces the first reflecting surface 2 through the second opening 12 of the first reflecting surface portion 7 and sandwiching the second focal point F2 of the first reflecting surface 2. The second reflecting surface 3 is a reflecting surface based on a parabola, for example, a reflecting surface such as a rotating paraboloid, an elliptical paraboloid, a parabolic column surface, or a free-form surface based on a paraboloid. . The optical axis Z1-Z1 of the second reflecting surface 3 is substantially parallel to the horizontal axis H-H when viewed from the side, as shown in the longitudinal sectional view (vertical sectional view) of FIG. Further, the optical axis Z1-Z1 of the second reflecting surface 3 is obliquely left or right with respect to the optical axis ZZ of the first reflecting surface 2 as viewed from above, as shown in the plan view of FIG. (In this example, it is inclined to the right).

  The shade portion 9 is disposed between the first reflective surface portion 7 and the second reflective surface portion 8. The shade 4 is formed in the shade portion 9. As shown in FIG. 2, the shade 4 has a chevron shape with a vertical cross-sectional shape of a square shape. The ridgeline of the shade-shaped shade 4 is located in the vicinity of the second focal point F2 of the first reflecting surface 2, and forms an edge portion 13 that forms a cut line CL at the upper edge of the predetermined light distribution pattern P shown in FIG. Form.

  The LED 6 is composed of a substrate 14 and a light emitting unit 15 and has the characteristics of the emission pattern shown in FIG. In FIG. 5, the vertical axis indicates the luminous intensity, and the horizontal axis indicates the emission angle. From the characteristics of the emission pattern shown in FIG. 5, the luminous intensity at the emission angle of 0 ° is maximum. The light emitting unit 15 of the LED 6 is disposed in the vicinity of the first focal point F <b> 1 of the first reflecting surface 2. As a result, the LED 6 is disposed in the first opening 11 of the first reflecting surface 2. As shown in FIG. 2, the 0 ° axis Z0-Z0 of the LED 6 is opposite to the light reflection direction of the first reflection surface 2 with respect to the optical axis ZZ of the first reflection surface 2. Inclined. That is, on the light emitting unit 15 side of the LED 6, the 0 ° axis Z0-Z0 of the LED 6 is inclined downward with respect to the axis ZV-ZV perpendicular to the optical axis ZZ of the first reflecting surface 2. Yes.

  As shown in FIG. 6, a plurality of, in this example, six vehicle lamps 1, are lamp chambers (not shown) partitioned into an outer lens or outer cover (not shown) and a lamp housing 18. And is attached to the lamp housing 18 via a holder 19 or the like. The six vehicular lamps 1 are mounted on a vehicle (not shown) so that the optical axis ZZ of the first reflecting surface 2 is substantially parallel to the traveling axis HH of the vehicle.

  Hereinafter, the operation of the vehicular lamp 1 in this embodiment will be described. First, the light emitting portions 15 of the LEDs 6 of the six vehicular lamps 1 are turned on. Then, most of the light radiated from the light emitting portion 15 of the LED 6 (shown by broken line arrows and solid line arrows in FIGS. 1 and 2) is reflected by the first reflecting surface 2, and the remaining part is second. The light directly enters the second reflecting surface 3 through the opening 12. The reflected light reflected by the first reflecting surface 2 proceeds to the second focal point F2 of the first reflecting surface 2 through the second opening 12. At the second focal point F <b> 2, part of the reflected light is cut off by the shade 4, and the remaining reflected light is incident on the second reflection 3.

  Light incident on the second reflecting surface 3 (reflected light from the first reflecting surface 2 and direct light from the LED 6) is reflected by the second reflecting surface 3. As shown in FIG. 1, the reflected light reflected by the second reflecting surface 3 is irradiated on the left side or the right side as viewed from above with respect to the optical axis ZZ of the first reflecting surface 2, and in this example, the right side is irradiated. The As a result, as shown in FIG. 4, the predetermined light distribution pattern P in which the cut line CL is formed at the upper edge by the edge portion 13 of the shade 4 has the right R about the road surface or the like with respect to the vertical vertical axis VU-VD. Illuminate over a range from 0 ° to about 60 °. Here, among the six vehicular lamps 1, the second reflecting surface 3 of any number of vehicular lamps 1 is a diffusion type reflecting surface, and the vehicular lamp 1 is used for forming a predetermined light distribution pattern P. Let the 2nd reflective surface 3 of the remaining vehicle lamp 1 be a condensing type reflective surface, and let the vehicle lamp 1 be for hot zone HZ formation. Then, as shown in FIG. 4, a predetermined light distribution pattern P and a hot zone HZ located in the substantially central part (range from the right side R22 ° to 38 °) are obtained.

  Hereinafter, effects of the vehicular lamp in this embodiment will be described. As shown in FIG. 2, the vehicular lamp 1 in this embodiment is inclined obliquely with respect to the optical axis Z1-Z1 of the second reflecting surface 3 where the optical axis ZZ of the first reflecting surface 2 is substantially horizontal. ing. As a result, the vehicular lamp 1 in this embodiment includes the optical axis ZZ and the first axis of the first reflecting surface 2 in which each component (the first reflecting surface 2, the second reflecting surface 3, the LED 6, etc.) is inclined obliquely. Since the layout is made with respect to the optical axis Z1-Z1 of the second reflecting surface 3, the degree of inclination between the optical axis Z-Z of the first reflecting surface 2 and the optical axis Z1-Z1 of the second reflecting surface 3 that are inclined obliquely. By adjusting, the degree of freedom in layout design of each component increases and increases.

  Here, in the vehicle lamp (10) of Patent Document 1 in which the optical axis (Y) of the second reflecting surface (4) is orthogonal to the irradiation direction (X1), the storage space is in the irradiation direction (X1). In the vehicular lamp in which the optical axis of the reflecting surface coincides with the light irradiation direction, the storage space increases in the light irradiation direction. On the other hand, in the vehicle lamp 1 in this embodiment, the optical axis ZZ of the first reflecting surface 2 and the optical axis Z1-Z1 of the second reflecting surface 3, that is, the light irradiation direction are oblique. The storage space of the vehicular lamp 1 does not increase in the direction perpendicular to the light irradiation direction or in the light irradiation direction, and is stored in a moderate storage space.

  In addition, as shown in FIG. 2, the vehicular lamp 1 in this embodiment has the first reflecting surface 2 positioned on the front side and the obliquely lower side with respect to the second reflecting surface 3. A second opening 12 is provided between the reflecting surface 2 and the LED 6 side and the second reflecting surface 3 side. For this reason, the vehicular lamp 1 in this embodiment has the heat generated by the LED 6 by heat convection, that is, by heat convection flowing from the lower first opening 11 to the upper second opening 12 and above the LED 6. It can discharge | emit efficiently from the 2nd opening part 12 located outside, and is excellent in the heat dissipation effect of LED6.

  In particular, as shown in FIG. 1, the vehicular lamp 1 in this embodiment is such that the optical axis Z <b> 1-Z <b> 1 of the second reflecting surface 3 is the left side when viewed from above with respect to the optical axis ZZ of the first reflecting surface 2. Alternatively, since it is inclined to the right side, the reflected light reflected by the second reflecting surface 3 is irradiated to the left or right side as viewed from above with respect to the optical axis ZZ of the first reflecting surface 2. For this purpose, the vehicular lamp 1 in this embodiment illuminates the left or right road shoulder by setting the optical axis ZZ of the first reflecting surface 2 substantially parallel to the traveling axis HH of the vehicle. Thus, a light distribution pattern P suitable for this is obtained.

  Further, the vehicular lamp 1 in this embodiment simply directs the optical axis Z1-Z1 of the second reflecting surface 2 to the left or right side when viewed from above with respect to the optical axis ZZ of the first reflecting surface 2. Therefore, it is not necessary to change the arrangement of other components, for example, the first reflecting surface 2, the shade 4, and the LED 6. For this reason, the vehicular lamp 1 in this embodiment can be provided by a simple minor change, and an increase in manufacturing cost can be suppressed.

  Furthermore, as shown in FIG. 2, the vehicular lamp 1 according to this embodiment is configured such that the 0 ° axis Z0-Z0 of the LED 6 is relative to the optical axis ZZ of the first reflective surface 2 with respect to the first reflective surface 2. It is inclined to the opposite side to the light reflection direction (that is, the lower side with respect to the axis ZV-ZV perpendicular to the optical axis ZZ of the first reflecting surface 2). For this reason, the vehicular lamp 1 in this embodiment is obtained when the 0 ° axis Z0-Z0 of the LED 6 is aligned with the axis ZV-ZV perpendicular to the optical axis ZZ of the first reflecting surface 2. In comparison, the amount of light that is direct light from the LED 6 and incident on the second reflecting surface 3 through the second opening 12 can be reduced, and accordingly, the amount of light from the LED 6 to the first reflecting surface 2 can be reduced. The amount of incident light can be increased. As a result, the vehicular lamp 1 in this embodiment can effectively use the light from the LED 6 and can illuminate the road surface brightly.

  Furthermore, the vehicular lamp 1 in this embodiment cuts off part of the reflected light from the first reflecting surface 2 in the vicinity of the second focal point F2 of the first reflecting surface 2 and uses the remaining reflected light for a predetermined distribution. A shade 4 for forming a light pattern (light distribution pattern having a cut line CL formed on the upper edge as shown in FIG. 4) P is provided. For this reason, the vehicular lamp 1 in this embodiment provides a light distribution pattern P having a cut line CL formed at the upper edge, so that a vehicular lamp that illuminates the left or right road shoulder, for example, a curved line, is used. Suitable for street light (curve lamp, bending lamp).

  Furthermore, the vehicular lamp 1 in this embodiment is capable of adjusting the angle at which the predetermined light distribution pattern P is swung left and right by adjusting the angle at which the second reflecting surface 3 is directed left and right. For this reason, the vehicular lamp 1 in this embodiment can share the components other than the second reflecting surface 3, that is, the first reflecting surface 2, the shade 4, and the LED 6, and accordingly, the sex brightening strike. Can be made cheaper.

  In the vehicular lamp 1 in this embodiment, the 0 ° axis Z0-Z0 of the LED 6 is opposite to the light reflection direction of the first reflection surface 2 with respect to the optical axis ZZ of the first reflection surface 2. It is inclined. However, in the present invention, the 0 ° axis Z0-Z0 of the LED 6 may coincide with the axis ZV-ZV perpendicular to the optical axis ZZ of the first reflecting surface 2.

  Further, in the vehicular lamp 1 according to this embodiment, a part of the reflected light from the first reflecting surface 2 is cut off in the vicinity of the second focal point F2 of the first reflecting surface 2 and a predetermined distribution is provided by the remaining reflected light. However, according to the present invention, a predetermined light distribution pattern having no cut line at the upper edge can be obtained without providing the shade 4. May be.

It is a top view which shows the Example of the vehicle lamp concerning this invention. It is the II-II sectional view taken on the line in FIG. It is a III arrow directional view in FIG. It is explanatory drawing which shows the light distribution pattern obtained with the vehicle lamp of this Example. It is explanatory drawing which shows the emission pattern characteristic of LED. It is a front view which shows the state which attached the vehicle lamp of the six this Example to the lamp housing.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 1st reflective surface 3 2nd reflective surface 4 Shade 5 Reflector 6 LED
7 First Reflecting Surface Part 8 Second Reflecting Surface Part 9 Shade Part 10 Plate Part 11 First Opening Part 12 Second Opening Part 13 Edge Part 14 Substrate 15 Light Emitting Part 18 Lamp Housing 19 Holder F Front Side B Rear Side U Upper D Lower Side L Left R Right HL-HR Horizontal horizontal line VU-VD Vertical vertical line HH Horizontal axis, vehicle traveling axis F1 First focal point F2 Second focal point ZZ Optical axis Z1-Z1 second reflective surface Optical axis of reflective surface CL Cut line P Predetermined light distribution pattern HZ Hot zone Z0-Z0 0 ° axis of LED ZV-ZV Axis perpendicular to optical axis of first reflective surface

Claims (4)

In a vehicular lamp that uses an LED as a light source and has two reflecting surfaces,
A first reflecting surface based on an ellipse; a second reflecting surface based on a parabola; and the LED disposed in the vicinity of a first focal point of the first reflecting surface;
The optical axis of the first reflecting surface is inclined obliquely with respect to the optical axis of the second reflecting surface that is substantially horizontal when viewed from the side surface,
The first reflective surface is located obliquely below the second reflective surface,
An opening for passing reflected light from the first reflecting surface and direct light from the LED through the second reflecting surface between the first reflecting surface and the LED side and the second reflecting surface side. Is provided,
A vehicular lamp characterized by the above.   2. The vehicular lamp according to claim 1, wherein an optical axis of the second reflecting surface is inclined leftward or rightward with respect to an optical axis of the first reflecting surface when viewed from a plane.   3. The LED according to claim 1, wherein an axis of 0 ° of the LED is inclined to a side opposite to a light reflection direction of the first reflection surface with respect to an optical axis of the first reflection surface. The vehicle lamp as described.   A shade that cuts off part of the reflected light from the first reflecting surface and forms a predetermined light distribution pattern with the remaining reflected light is provided in the vicinity of the second focal point of the first reflecting surface. The vehicular lamp according to any one of claims 1 to 3.

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