JP2011108434A - Lighting system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a structure that efficiently guides light emitted from a light source in an illumination direction. <P>SOLUTION: This lighting system includes: a first LED light source 2A disposed on a base 1; a first light guide 3A for receiving the light emitted from the first LED light source 2A and guiding it in an illumination direction 4; a light hole 11 provided in the base 1 to allow the light emitted from the first LED light source and reflected without being received by the first light guide to pass through toward the back of the base; and a second light guide 3B for guiding the light through the light hole 11 in the illumination direction 4. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

    The present invention belongs to the technical field of lighting devices.

Conventionally, an LED light source is disposed on a substrate, light from the light source is received by a light guide, and guided in a direction in which illumination is desired (for example, see Patent Document 1).

JP 2009-9926 A Japanese Patent Laid-Open No. 7-113663

However, in Patent Document 1, in order to make the light from the light source enter the light guide as much as possible, the shape of the incident surface is devised as shown in FIG. 3 of Patent Document 1, for example. When the light enters, there is light that is reflected by the reflectance determined by the refractive index and the incident angle, so that not all light enters the light guide. Since the reflected light hits the substrate and a part of the light is absorbed, there is a problem that the efficiency of illumination deteriorates.

Further, in Patent Document 2, as shown in FIGS. 3 and 7 of Patent Document 2, a technique for reducing absorption by performing white coating on a substrate or using a reflector integrated with a housing is described. However, absorption cannot be eliminated and lighting efficiency is not good.

The present invention has been made in view of such technical problems of the prior art, and an object thereof is to provide a structure for efficiently guiding light emitted from a light source in an illumination direction.

The first invention comprises a first LED light source disposed on a substrate,
A first light guide that receives light emitted from the first LED light source and guides it in an illumination direction; and
A light passage hole provided in the substrate for allowing light emitted from the first LED light source to pass through the light reflected from the first light guide without being received by the first light guide;
A second light guide for guiding the light passing through the light passage hole in the illumination direction;
It is the illuminating device characterized by having provided.

According to a second invention, in the first invention, a second LED light source is disposed on the back side of the substrate,
In the illumination device, the light passage hole allows light emitted from the second light source to pass to a surface side of the substrate.

A third invention is a first LED light source disposed on a substrate;
A first light guide that receives light emitted from the first LED light source and guides it in an illumination direction; and
A light passage hole provided in the substrate for allowing light emitted from the first LED light source to pass through the light reflected from the first light guide without being received by the first light guide;
An illumination device, wherein the second light guide emits light that has passed through the light passage hole in the direction of the first light guide.

Therefore, according to the first aspect of the invention, the light absorbed by the substrate is taken into the second light guide and can be used for illumination, so that there is an effect that the efficiency of illumination is improved.

According to the second aspect of the present invention, the second LED light source is arranged on the back surface of the substrate, so that the amount of light can be increased with the same substrate size.

  According to the third invention, since the light is returned to the first light guide, the illumination light can be concentrated.

1 is a cross-sectional view illustrating a configuration of Example 1. FIG. 10 is a cross-sectional view illustrating a configuration of Example 2. FIG. 10 is a cross-sectional view illustrating a configuration of Example 3. FIG. It is explanatory drawing showing the example of the shape of a board | substrate. It is sectional drawing showing the example of the shape of a light guide.

The embodiment of the lighting device according to the present invention corresponds to the first embodiment corresponding to the invention according to claim 1, the second embodiment corresponding to the invention according to claim 2, and the invention according to claim 3. A description will be given based on Example 3.

  First, the configuration will be described.

  FIG. 1 is a cross-sectional view illustrating the configuration of the first embodiment.

The illuminating device of Example 1 includes a substrate 1, a first LED light source 2A, a first light guide 3A, and a second light guide 3B.

The substrate 1 is mounted with the first LED light source 2A and has a light passage hole 11 in the vicinity thereof.

The first light guide 3A is on the surface side of the substrate 1 and receives light from the first LED light source 2A and emits it in the illumination direction.

The second light guide 3 </ b> B is on the back side of the substrate 1, takes in the light reflected by the incident surface of the first light guide 3 </ b> A, and emits it in the illumination direction 4.

  FIG. 4 is an explanatory diagram illustrating an example of the shape of the substrate 1 used in the first embodiment.

The 1st LED light source 2A is arrange | positioned on a board | substrate, and it is stealing so that it may become the light passage hole 11 between LED light sources.

  The operation will be described.

[Improvement in performance to suppress light absorption]
In Example 1, most of the light emitted from the first LED light source 2A is incident from the incident surface 3AI of the first light guide 3A, is reflected by the reflecting surface 3AF, and is illuminated 4 from the emitting surface 3AO. Is emitted. Conventionally, the light reflected by the incident surface 3AI of the first light guide hits the substrate 1 and is partially absorbed, but in Example 1, it passes through the light passage hole 11 provided in the substrate 1. Substrate 1
Is incident on the second light guide 3B prepared on the back surface side. Thereafter, the light is reflected by the reflection surface 3BF and emitted from the emission surface 3BO in the illumination direction 4.

  Next, the effect will be described.

In the illuminating device of Example 1, the following effects can be obtained.

(1) A first LED light source 2A disposed on the substrate 1, a first light guide 3A that receives light emitted from the first LED light source 2A and guides it in the illumination direction 4, and the first light source 3A. A light passage hole 11 provided in the substrate 1 for allowing light emitted from the LED light source 2A (light reflected without being received by the first light guide) to pass through the back surface of the substrate 1; The light passing through the light passage hole 11 is converted into the illumination direction 4
Since the second light guide 3B that leads to the light is provided, the absorption of light can be suppressed and the illumination efficiency can be improved.

  Example 2 is an example in which a second LED light source 2B is provided.

  The configuration will be described.

FIG. 2 is a cross-sectional view illustrating a configuration of the second embodiment.

Example 2 includes a second LED light source 2 </ b> B on the back side of the substrate 1.

FIG. 5 is a cross-sectional view illustrating the shape of the light guide used in the second embodiment.

An incident surface 2BI for taking in the light of the second LED light source 2B is provided.

  The operation will be described.

In the first embodiment, light emitted from the second light source 2B is emitted from the second light source 2B in the same manner as the first light guide 3A emits light from the first light source 2A in the illumination direction 4. It enters 3B, is reflected by the reflecting surface 3BF, and is emitted in the illumination direction 4 from the emitting surface 3BO.

  Explain the effect.

The lighting device of Embodiment 2 has the following effects in addition to the above (1).

(2) Since the second LED light source 2B is arranged on the back surface of the substrate 1, it is possible to perform illumination with an increased amount of light. The reflected light of the second LED light source passes through the light passage hole 11 to the substrate surface, so that light from both directions passes through the light passage hole 11 so that it can be used more effectively and the illumination efficiency is improved. .

  Example 3 is an example in which the emission direction of the second light guide 3 </ b> B is the surface side of the substrate 1.

  The configuration will be described.

FIG. 3 is a cross-sectional view illustrating the configuration of the third embodiment.

The second light guide 3B includes a reflective surface 3BFa and a reflective surface 3BFb that reflect incident light toward the substrate surface.

  The operation will be described.

Similar to the first embodiment, the light reflected by the incident surface 3AI of the first light guide hits the surface of the substrate 1 and is not absorbed and passes through the light passage hole 11 to the back surface side of the substrate 1. The light enters the prepared second light guide 3B. The light escaped from the absorption is reflected by the reflection surface 3BFa and the reflection surface 3BFb, changes its direction in the second light guide 3B, and returns to the first light guide 3A again.

  Explain the effect.

The lighting device of Example 3 has the following effects.

(3) The illumination light can be emitted from the first light guide 3A, and the illumination light can be concentrated.
In addition, it is not necessary to change the shape of the first light guide when the second light guide is used and when it is not used, and the design is easy.

DESCRIPTION OF SYMBOLS 1 Board | substrate 11 Light passage hole 2A 1st LED light source 2B 2nd LED light source 3A 1st light guide 3B 2nd light guide 4 Illumination direction

Claims (3)

A first LED light source disposed on the substrate;
A first light guide that receives light emitted from the first LED light source and guides it in an illumination direction; and
A light passage hole provided in the substrate for allowing light emitted from the first LED light source to pass through the light reflected from the first light guide without being received by the first light guide;
A second light guide for guiding the light passing through the light passage hole in the illumination direction;
An illumination device comprising: The lighting device according to claim 1.
A lighting device, wherein a second LED light source is disposed on the back side of the substrate, and the light passage hole allows light emitted from the second light source to pass to the surface side of the substrate. A first LED light source disposed on the substrate;
A first light guide that receives light emitted from the first LED light source and guides it in an illumination direction; and
A light passage hole provided in the substrate for allowing light emitted from the first LED light source to pass through the light reflected from the first light guide without being received by the first light guide;
A second light guide that guides light that has passed through the light passage hole toward the first light guide;
An illumination device comprising:

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