JP2005123092A - Led lighting tool - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED lighting tool with excellent light radiation efficiency and excellent visibility as a lighting tool, without making a structure larger and more complicated. <P>SOLUTION: As a driver treads on a brake pedal, LED chips 40 are lit by electricity being passed on LEDs 4 through a wire harness and a wiring pattern of an LED-mounting board 40, and red-color light irradiated from the LED chips 40 enter into a light guide body 5 through periphery faces of LED housing parts 5B, are reflected by a deposition face 5a to be diffused inside the light guide body 5, and reach a half-deposition face 5b. The half-deposition face 5b transmits part of the light diffused and reflects part of it. The light reflected by the half-deposition face 5b diffuses inside the light guide body again to be reflected at the deposition face 5a, and diffuses inside the light guide body to reach the half-deposition face 5b. Like this, the light is irradiated outside while the reflection is repeated between the deposition face 5a and the half-deposition face 5b. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an LED lamp that is installed at a predetermined position of a moving vehicle such as a four-wheeled vehicle, (hereinafter simply referred to as “automobile”), or a motorcycle, and that mainly transmits the behavior of the moving vehicle to the rear of the vehicle. The present invention relates to an LED lamp capable of imparting high visibility of emitted light over a wide range behind a vehicle with a simple configuration.

  A moving vehicle such as an automobile or a motorcycle is provided with a lamp for visually transmitting the behavior of the own vehicle mainly behind the vehicle. The lamp includes, for example, a brake light, a tail light, a blinker light, and a reverse light, and is formed such that these lamps are lit or blinking according to the behavior of the vehicle and the traveling direction. As a light source of such a lamp, there is a light source that uses an LED (Light-Emitting Diode) in recent years. Since a lamp using an LED has a long life and excellent power saving performance, it is suitable for an application such as an automobile having many restrictions in terms of power supply. Further, since the size of the LED is small, it is expected to realize downsizing of the lamp.

  However, in a lamp that is used for warning, such as a brake light, the illuminability is not sufficient only by the amount of light emitted from the LED. Therefore, a lamp that expands the irradiation area by combining an optical member such as a lens has been proposed. (For example, refer to Patent Document 1).

  The lamp described in Patent Document 1 includes a light source having an LED as a light source and a dome portion and a base portion, an incident surface, a first reflection region, a first reflection surface, a direct conduction region, a second reflection region, It has a lens element composed of an irradiation surface, an edge, and a post, and an optical element in which a pillow lens is formed in an array shape. A set is formed 360 degrees around the first reflective area. Further, the light source is configured such that the dome portion is positioned at the center of the first reflection region by coupling the recess of the base portion and the post of the lens element.

In such a configuration, when light is emitted from the light source, it is reflected by the first reflecting surface in a direction orthogonal to the central axis direction of the light source, propagates through the lens element, and is reflected by the extraction surface and reflected by the central axis direction. Light emitted from the surface and light emitted from the light source directly through the conduction region and emitted in the central axis direction can be obtained. As a result, light with an enlarged irradiation range is incident on the optical element while the optical system is thinned.
International Publication No. 99/09349 Pamphlet

  However, according to the conventional LED lamp, in order to secure a wide irradiation area, a corresponding area is required for the second reflection region, and further, a configuration for enhancing external radiation is required, so that the size of the lens element is large. And the configuration becomes complicated. Further, since light incident loss is likely to occur due to interface reflection or the like when light is incident on the lens element, the light emission efficiency is lowered. Moreover, there exists a problem that the visibility as a lamp falls based on the fall of light radiation efficiency.

  Accordingly, an object of the present invention is to provide an LED lamp that is excellent in light radiation efficiency and excellent in visibility as a lamp without increasing the size and complexity of the configuration.

  In order to achieve the above object, the present invention provides an LED lamp that emits light emitted from an LED light source to the outside through a light guide, a reflective surface that reflects the light incident on the light guide, and the reflection Provided is an LED lamp characterized in that a semi-reflective surface provided so as to face a surface and transmit a part of the light and reflect a part thereof is disposed.

  The reflective surface and the semi-reflective surface may be provided integrally with the light guide.

  The reflection surface may include a light incident portion that receives the light emitted from the LED light source and may be provided on a predetermined surface of the light guide.

  The light guide may include a plurality of LED housing portions that house the plurality of LED light sources as the light incident portions.

  The LED light source is preferably a lateral emission type LED light source that emits the light laterally.

  In order to achieve the above object, the present invention provides an LED lamp that emits light emitted from an LED light source to the outside via a light guide, and the incident light that is provided integrally with the light guide. A light-reflective first reflective surface that reflects, and a semi-reflective second reflective surface that is provided opposite to the first reflective surface and transmits part of the light and reflects part of the light And a laterally emitting LED light source that is provided on the first reflecting surface side and that makes the light incident on the light guide.

  The lateral emission type LED light source is accommodated in an LED accommodating portion provided in a concave shape on the first reflecting surface side of the light guide, and a part of the light is reflected in the first reflection via the light guide. It is preferable to enter the surface.

  According to the LED lamp of the present invention, the light from the LED light source is incident on the light guide provided so that the reflecting surface and the semi-reflecting surface face each other. Regardless of the complexity, the structure can be simplified and the number of parts can be reduced, so that the light emission efficiency is high, and the visibility of the light emitted from the semi-reflective surface is enhanced.

  FIG. 1 is a rear perspective view showing an automobile to which an LED lamp according to a first embodiment of the present invention is applied. The rear-view endoscope apparatus 1 has rear combination lamps 3 on both sides of a hatch gate 2 provided at the rear part of the automobile 1. The rear combination lamp 3 has a target shape on the left and right sides of the hatch gate 2. In the following description, the vehicle width direction will be described as the X direction, the vehicle height direction as the Y direction, and the vehicle forward direction as the Z direction.

  FIG. 2 is a front view showing the rear combination lamp. The rear combination lamp 3 includes a main body 30 molded to a predetermined thickness by a resin such as acrylic and polycarbonate having weather resistance and impact resistance, and a main body molded to a predetermined thickness by a transparent resin such as acrylic and polycarbonate. A transparent cover 31 provided so as to cover the front surface of 30, a partition member 32 which is molded to a predetermined thickness by a colorless transparent or translucent resin such as acrylic or polycarbonate, and provided at a predetermined interval on the main body 30, and a brake A lateral emission type LED 4 that is a light source of a lamp, a tail light, and a blinker lamp, a light guide 5 that is formed of a transparent resin material and guides light emitted from the LED 4, and a light guide 5. And a light reflecting portion 5 </ b> A that mainly reflects light radiated laterally from the LED 4 toward the rear of the vehicle.

  For example, the LED lamp 4 emits light of amber (orange) color for the blinker lamp, and emits red light for the brake light and the tail lamp. In addition, you may make it finally obtain required light with the combination of the luminescent color of the LED lamp 4, and the color of the material of the light guide 5. FIG. For example, by combining an LED lamp 4 that emits white light and a light guide 5 made of a transparent amber color material, it is possible to emit amber color light, and a transparent red color material. Red light can be emitted by combining the light guide 5 made of

  The light guide 5 is molded from a transparent resin such as acrylic or polycarbonate, and is attached to a space partitioned by the partition member 32. Moreover, LED4 is arrange | positioned in the center in several light reflection part 5A. The light reflecting portion 5A is formed so as to have an annular reflection region centered on the LED 4 when the light guide 5 is molded, and a light reflecting surface is formed by evaporating aluminum after molding. The light reflecting portion 5A reflects light incident on the light guide 5 at the light reflecting surface.

  FIG. 3 is a view showing a longitudinal section of the LED lamp. The LED lamp 4 is disposed on the XY plane with a gap for insulation, and has a pair of lead frames 41A and 41B made of a metal such as a copper alloy or an aluminum alloy having good thermal conductivity, and an L-shape. LED chip 40 mounted on the upper surface of one bent lead frame 41A, wire W for electrically connecting the electrode on the upper surface of LED chip 40 and the tip of the other lead frame 41B, lead frame 41A, A part 41B, the LED chip 40, and the wire W are sealed, and a resin sealing member 42 made of a transparent epoxy resin or the like that imparts directivity in the planar direction to the emitted light of the LED chip 40 is included.

  The resin sealing member 42 has a generally flat cylindrical shape as a whole, a flat surface 42A provided immediately above the LED chip 40, and a reflective surface 42B formed in an arc shape in the side surface direction following the flat surface 42A. And a side radiation surface 42C following the reflection surface 42B. The reflective surface 42B is focused around the center of the light emitting surface of the LED chip 40, and a part of the parabola with the X axis direction as the axis of symmetry rotates around the Z axis within a range of 60 degrees or more from the origin with respect to the Z axis By making it, it is formed in an umbrella shape.

  FIG. 4 is a perspective view of the light guide. The light guide 5 has a vapor deposition surface 5a as a reflection surface provided on the end surface on the light reflecting portion 5A side based on the vapor deposition of aluminum, and is provided on the end surface on the light emission side based on the semi vapor deposition of aluminum and transmits half light. And a semi-deposited surface 5b as a semi-reflective surface having a property. Providing the vapor deposition surface 5a and the semi-vapor deposition surface 5b in this manner complicates the propagation of light incident on the light guide 5. The semi-deposition surface 5b is formed to have a small film thickness by performing the aluminum deposition time in a shorter time than the formation of the deposition surface 5a. Light is emitted.

  FIG. 5 is a cross-sectional view of the rear combination lamp taken along line AA in FIG. LED4 is accommodated in LED accommodating part 5B as a light-incidence part provided in the light guide 5 at concave shape. The LED 4 is electrically connected to the wiring pattern of the LED mounting board 40, and has a configuration in which the plurality of LEDs 4 and the light guide 5 can be separated based on the attachment / detachment of the LED mounting board 40.

  Next, lighting of the brake lamp will be described as an operation of the present embodiment. When the driver steps on the brake pedal, the LED 4 is energized through the wire harness and the wiring pattern of the LED mounting board 40. The LED chip 40 is turned on based on energization, and the light emitted on the axis among the red light emitted from the LED chip 40 is directly reflected on the axis without being reflected by the flat surface 42A of the resin sealing member 42. The light reflected by the reflecting surface 42B is directed in all directions of a plane 360 ° perpendicular to the central axis of the LED chip 40 and is incident on the peripheral surface of the LED housing portion 5B, as shown in FIG. As described above, the light is reflected by the vapor deposition surface 5a of the light guide 5 and propagates through the light guide 5 to reach the semi-vapor deposition surface 5b. The semi-deposition surface 5b transmits a part of the propagated light and reflects a part thereof. The light reflected by the semi-deposition surface 5b propagates again through the light guide 5 and is reflected by the vapor deposition surface 5a, propagates through the light guide 5 and reaches the semi-evaporation surface 5b. In this way, light is emitted to the outside while repeating the reflection on the vapor deposition surface 5a and the semi-vapor deposition surface 5b.

According to the rear combination lamp 3 according to the first embodiment, the following effects can be obtained.
(1) Since light emitted from the LED 4 is propagated into the light guide 5 and reflected by the vapor deposition surface 5a as the first reflection surface and the semi-vapor deposition surface 5b as the second reflection surface, the light is emitted externally. The visibility that does not depend on the size of the light guide 5 and that the light of the LED 4 diffuses into the light guide 5 and has a plurality of point light sources without complicating the reflection shape of the light reflecting portion 5A. Can be given.
(2) Since the lateral emission type LED 4 is accommodated in the LED accommodating portion 5B of the light guide 5, the light radiation efficiency to the outside of the light guide 5 is reduced by the interface reflection of the light emitted from the LED 4. Can be prevented. That is, since the place where the interface reflection can occur is a concave portion in the light guide 5, even if the interface reflection occurs, the reflected light hardly leaks to the outside of the light guide 5 and may be incident again. There is.
(3) Since the light reflecting portion 5A is formed on the transparent light guide 5 by vapor deposition, it is not necessary to provide a separate reflecting mirror, and the reflection shape of the light reflecting portion 5A is simultaneously provided when the light guide 5 is molded. And the manufacturing process can be simplified.
(4) Since the semi-evaporation surface 5b is provided on the light emitting side end surface of the transparent light guide 5, not only the shape and lighting state of the LED 4 can be visually recognized from the outside, but also part of the light reflected by the evaporation surface 5a. Can be reflected and re-entered on the vapor deposition surface 5a of the adjacent light reflecting portion 5A, and thus a visually novel lighting state can be generated.
(5) Since the light guide 5 itself serves as a support member for the LED mounting substrate 40, it is possible to adopt a configuration that does not require a separate LED 4 mounting member, to realize a reduction in the number of components, and to simplify the configuration. Can be planned.

  In the first embodiment, a transparent resin material having an approximate refractive index is filled between the LED 4 and the LED housing portion 5B to prevent the interface radiation of light in the LED housing portion 5B, and the light in this portion is filled. The incident loss may be reduced. Further, the shape of the LED accommodating portion 5B is not limited to the configuration provided in the above-described concave shape.

  In the first embodiment, the configuration in which the vapor deposition surface 5a and the semi-vapor deposition surface 5b are integrally provided on the light guide 5 has been described. For example, the reflection surface and the semi-reflection surface are formed as separate members. Then, it may be combined with the light guide 5.

  Moreover, although 1st Embodiment demonstrated the brake light, as what obtains the white light used for a reverse light, for example, YAG etc. in the LED accommodating part 5B of the light guide 5 formed with transparent resin The yellow phosphor layer is formed into a thin film, and the LED 4 that emits blue light is accommodated therein to emit light, thereby introducing white light based on a mixture of blue light and yellow light. It is good also as a wavelength conversion type lamp | ramp which propagates to the light body 5 and radiates | emits outside.

  The semi-deposition surface 5b in the first embodiment is a substantially colorless thin film, but may be colored in a predetermined color such as red or amber.

  In the first embodiment, the light source arrangement structure is such that the appearance of the LED 4 is visible when the rear combination lamp 3 is viewed from the outside. However, if the arrangement of the vapor deposition surface 5a and the semi-vapor deposition surface 5b is devised, Even in an arrangement in which the appearance of the LED 4 cannot be directly viewed, the light emitted from the LED 4 can be externally radiated from the light guide 5 to a desired range based on the reflection of the vapor deposition surface 5a and the semi-vapor deposition surface 5b. According to such a configuration, a pseudo light source image having uniqueness based on the reflected light image can be emitted from the light guide 5 to the outside.

  FIG. 6 is a perspective view showing a modified example of the light guide in the first embodiment. This light guide 5 is different from the light guide 5 shown in FIG. 4 in the configuration in which the portion where the semi-deposition surface 5b is formed has a flat planar portion 5C, and has a configuration common to the other portions. As described above, even if the end surface on the light emission side is a flat surface, a pseudo light source based on the reflection of light between the vapor deposition surface 5a and the semi-vapor deposition surface 5b can be visually generated.

  FIG. 7 is a perspective view showing another modified example of the light guide in the first embodiment. The light guide 5 is different from the light guide 5 shown in FIG. 4 in a configuration having a curved surface portion 5D formed of a curved surface in which a portion where the semi-deposition surface 5b is formed is divided, and is common in other portions. Have Thus, even if the end surface on the light emitting side is configured as a curved surface, a pseudo light source based on the reflection of light between the vapor deposition surface 5a and the semi-vapor deposition surface 5b can be visually generated.

  Moreover, when light strikes the light guide 5 from the outside, a shadow is formed on the contour of the curved surface-shaped portion 5D, so that the design is excellent. The curved surface portion 5D may be a concave shape in addition to the convex shape shown in the figure, and may further be a device that controls light emission as an optical lens.

1 is a rear perspective view showing an automobile to which an LED lamp according to a first embodiment of the present invention is applied. It is a front view which shows the rear combination lamp which concerns on the 1st Embodiment of this invention. It is a figure which shows the longitudinal cross-section of an LED lamp. It is a perspective view of the light guide which concerns on the 1st Embodiment of this invention. It is sectional drawing which cut | disconnected the rear combination lamp in the AA part of FIG. It is a perspective view which shows the modification of the light guide in 1st Embodiment. It is a perspective view which shows the other modification of the light guide in 1st Embodiment.

Explanation of symbols

1 Car 2 Hatchgate 3 Rear combination lamp 4 LED
5 Light Guide 5A Light Reflector 5B Housing 5C Planar Shape 5D Curved Shape 5a Deposition Surface 5b Semi-deposition Surface 30 Main Body 31 Transparent Cover 32 Partition Member 40 LED Chip 40 LED Mounting Substrate 41A Lead Frame 41B Lead Frame 42 Resin Encapsulation Stop member 42A Flat surface 42B Reflective surface 42C Side radiation surfaces 41A, 41B Lead frame

Claims (7)

In an LED lamp that radiates light emitted from an LED light source to the outside through a light guide,
A reflective surface that reflects the light incident on the light guide;
An LED lamp, comprising: a semi-reflective surface that is provided facing the reflective surface and transmits a part of the light and reflects a part thereof.   The LED lamp according to claim 1, wherein the reflecting surface and the semi-reflecting surface are provided integrally with the light guide.   2. The LED lamp according to claim 1, wherein the reflection surface includes a light incident portion that receives the light emitted from the LED light source and is provided on a predetermined surface of the light guide. 3.   4. The LED lamp according to claim 3, wherein the light guide has a plurality of LED housing portions for housing the plurality of LED light sources as the light incident portion.   The LED lamp according to claim 1, wherein the LED light source is a lateral emission type LED light source that emits the light laterally. In an LED lamp that radiates light emitted from an LED light source to the outside through a light guide,
A light reflecting first reflecting surface that is provided integrally with the light guide and reflects the incident light;
A semi-reflective second reflecting surface that is provided facing the first reflecting surface and transmits a part of the light and reflects a part thereof;
An LED lamp comprising: a lateral emission type LED light source provided on the first reflecting surface side and configured to make the light incident on the light guide.   The lateral emission type LED light source is accommodated in an LED accommodating portion provided in a concave shape on the first reflecting surface side of the light guide, and a part of the light is reflected in the first reflection via the light guide. The LED lamp according to claim 6, wherein the LED lamp is incident on a surface.