JP2022020174A - Lighting device - Google Patents

Abstract

To provide a lighting device capable of projecting a desired shape in a suitable manner, and capable of reducing the number of components and the size.SOLUTION: A lighting device 1 comprises a plurality of LEDs 22, a plurality of light guide bodies 3a to 3e that guide light emitted from each of the plurality of LEDs 22, and an imaging lens 4 that forms an image of the light emitted from each of the plurality of light guide bodies 3a to 3e at a predetermined position. Emission units 33 of the light guide bodies 3a to 3e are, for example, embossed in order to diffuse the light emitted from the light guide bodies 3a to 3e.SELECTED DRAWING: Figure 1

Description

The present invention relates to, for example, a lighting device capable of projecting a desired shape.

As a lighting device capable of projecting a desired shape, for example, the lighting device described in Patent Document 1 is disclosed.

Patent Document 1 describes the front focal point of a projection lens between a collimation lens that converts light emitted from an LED into parallel light and a projection lens that projects the light converted into parallel light by the collimation lens onto an irradiation surface. It is described that a light-shielding mask having an opening corresponding to a desired pattern is arranged in the vicinity to form a lighting device.

Japanese Unexamined Patent Publication No. 2008-210712

In the case of the invention described in Patent Document 1, there are the following problems. First, in the configuration described in Patent Document 1, a collimation lens, a light-shielding mask, and a projection lens are required in addition to the light source. Therefore, it may be difficult to reduce the number of parts and the cost of the device. Next, when a light-shielding mask is used, light blocked by the light-shielding mask is generated, and the efficiency of light collection is reduced. Further, when one shape is projected by combining the shapes projected by a plurality of lighting devices, it is necessary to adjust with high accuracy in order to match the projection direction and the projection position of each independent lighting device.

Therefore, an object of the present invention is to provide a lighting device capable of projecting a desired shape in a suitable state and reducing costs.

The invention according to claim 1, which has been made to solve the above problems, comprises a light source, a light guide body that guides light emitted from the light source, and has a light emitting portion formed in a predetermined shape. It is characterized by comprising an optical member that forms an image of light emitted from the light guide at a predetermined position, and the emitting portion is a diffusion surface for diffusing the light emitted from the light source. It is a lighting device.

According to the present invention, the light from the light source is collected by the light guide body and guided, and further, since the exit portion of the light guide body is a diffusion surface, uneven light emission and the like can be suppressed. Therefore, the desired shape can be projected in a suitable state, and the cost can be reduced.

It is a perspective view of the lighting apparatus which concerns on one Embodiment of this invention. It is a side view of the lighting apparatus shown in FIG. It is sectional drawing of the light guide body shown in FIG. It is a perspective view of the modification of the lighting apparatus shown in FIG. It is a side view of the lighting apparatus shown in FIG. It is a perspective view of another modification of a lighting device.

Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 5. FIG. 1 is a perspective view of a lighting device according to an embodiment of the present invention. Further, FIG. 2 is a side view of the lighting device shown in FIG.

The lighting device 1 includes an LED substrate 2, a light guide body 3, and an imaging lens 4. Note that, in FIGS. 1 and 2, only the main parts necessary for explaining the invention are displayed, and other parts constituting the lighting device 1 such as a housing are omitted.

The LED substrate 2 includes a substrate portion 21 and an LED 22. The board portion 21 is a printed circuit board on which electronic components such as LEDs 22 are mounted. The LED 22 is a well-known light emitting diode element. In the example shown in FIG. 2, five LED 22s, LED 22a, LED 22b, LED 22c, LED 22d, and LED 22e, are mounted on the substrate portion 21. The number of LEDs 22 is not limited to five.

The light guide body 3 collects and guides the light emitted from the LED 22 and emits the light to the imaging lens 4. In the example shown in FIG. 2, the light guide body 3 includes a light guide body 3a, a light guide body 3b, a light guide body 3c, a light guide body 3d, and a light guide body 3e. The light guide body 3a collects and guides the light emitted from the LED 22a. The light guide body 3b collects and guides the light emitted from the LED 22b. The light guide body 3c collects and guides the light emitted from the LED 22c. The light guide body 3d collects and guides the light emitted from the LED 22d. The light guide body 3e collects and guides the light emitted from the LED 22e. As described above, the light guide body 3 is provided corresponding to the LED 22.

FIG. 3 shows a cross-sectional view of the light guide body 3. FIG. 3 is a cross-sectional view taken along the line AA of FIG. That is, FIG. 3 is a cross-sectional view of the light guide body 3c. The other light guide bodies 3a, 3b, 3d, and 3e have the same basic configuration.

The light guide body 3 is configured as, for example, a light-transmitting resin molded product. The light guide body 3 includes an incident unit 31, a light guide unit 32, and an emission unit 33.

The incident portion 31 collects the light emitted from the LED 22. The incident portion 31 is formed with an incident surface 31a, an incident surface 31b, and a reflecting surface 31c. The incident surface 31a faces the LED 22. The incident surface 31a is formed on a spherical surface that is convex toward the LED 22.

The incident surface 31b is formed so as to surround the LED 22 at the peripheral portion of the incident surface 31a. The incident surface 31b has a front end continuous with the peripheral portion of the incident surface 31a and a concave curved surface with respect to the LED 22 whose base extends toward the substrate 21, and emits light emitted from the LED 22. A light beam with a large angle is incident.

The reflecting surface 31c is formed of, for example, a curved surface having a rotating parabolic shape (also referred to as a parabola shape) centered on the optical axis a, and totally reflects the incident light from the incident surface 31b. That is, the outer shape of the incident portion 31 is formed in a rotating parabolic shape.

The light guide unit 32 guides the light incident from the incident surface 31a and the light reflected by the reflecting surface 31c toward the emitting unit 33. The light guide unit 32 totally reflects light by its side surface portion 32a and guides the light toward the emission unit 33.

The light emitting unit 33 emits the light guided by the light guide unit 32. The emitting portion 33 is formed in a planar shape. The planar shape of the emitting portion 33 (the shape of the surface 33a) corresponds to the shape projected as the emitted light (projected shape). That is, the light guide body 3 may have a different surface shape of the emitting portion 33 and a cross-sectional shape parallel to the surface 33a.

Further, the surface 33a of the emitting unit 33 is a diffusion surface for diffusing the light emitted from the emitting unit 33. In the present embodiment, grain processing (processing to make fine irregularities on the surface) is performed to make the surface a diffusion surface. Experiments by the inventors have revealed that when the surface is not a diffusion surface, light emission unevenness occurs in the projected shape due to the influence of diffraction, aberration, etc. in the light guide body 3. Therefore, by applying grain processing, the emitted light is dispersed and the light emission unevenness is suppressed. Further, since the emitting portion 33 is a flat surface, it is easy to adjust the strength of grain processing (fineness of unevenness on the surface), and it is also easy to make adjustments so as to minimize the decrease in emission intensity due to grain processing. be able to.

In addition, instead of the grain processing, a diffusion member such as a diffusion sheet may be attached to the surface of the exit portion 33. Further, the grain processing may not be uniformly applied to the surface 33a of the emitting portion 33.

Further, the light guide body 3 is formed so that the length in the width direction (left-right direction in FIG. 2) is smaller on the exit portion 33 side than on the incident portion 31 side. This is because the outer shape of the incident portion 31 is composed of a curved surface having a rotating parabolic shape, so that a certain width is required. Therefore, as shown in FIG. 3, the light guide body 3c is formed so as to become thinner from the incident portion 31 toward the exit portion 33. Similarly, the other light guide bodies 3a, 3b, 3d, and 3e are also formed so as to become thinner from the incident portion 31 toward the exit portion 33. That is, it can be said that the area of the surface 33a of the emitting portion 33 is smaller than the surface of the incident portion 31 parallel to the surface 33a having the maximum cross-sectional area.

In the light guide bodies 3b and 3d, each of the light guide portions 32 is bent toward the light guide body 3c so that the light emitting portion 33 comes into contact with the light emitting portion 33 of the light guide body 3c (FIG. 2). reference). Similarly, in the light guide body 3a, the light guide portion 32 is bent toward the light guide body 3b so that the light emitting portion 33 comes into contact with the light emitting portion 33 of the light guide body 3b. In the light guide body 3e, the light guide portion 32 is bent toward the light guide body 3d so that the light emitting portion 33 comes into contact with the light emitting portion 33 of the light guide body 3d.

Further, the light guide bodies 3a, 3b, 3c, 3d, and 3e may be bonded to each other at the emitting portion 33 by adhesion or the like. Alternatively, the light guide bodies 3a, 3b, 3c, 3d, and 3e may be integrally molded as a member to which the exit portion 33 side is connected. Further, when the light guide bodies 3a, 3b, 3c, 3d, and 3e are combined as the light guide body 3, the surfaces 33a of the emission unit 33 are substantially flush with each other.

As described in FIGS. 1 and 2, the imaging lens 4 is provided so as to be isolated from the light guide body 3 for a predetermined period of time. The imaging lens 4 is formed as a biconvex lens. The imaging lens 4 is an optical member that forms an image of light emitted from the light guide 3 (3a, 3b, 3c, 3d, 3e) at a position (floor surface, wall surface, etc.) separated from the imaging lens 4 by a predetermined distance. Is. For example, in FIG. 1, since the exit portion 33 of the light guide body 3 (the shape in which the end faces of the light guide bodies 3a, 3b, 3c, 3d, and 3e are combined) is trapezoidal, the shape of the imaged light is formed. Is trapezoidal.

4 and 5 show modified examples of the light guide body 3. FIG. 4 is a perspective view of the lighting device according to the modified example. Further, FIG. 5 is a side view of the lighting device shown in FIG.

In the light guide body 3A according to the modification shown in FIGS. 4 and 5, the incident portion 31 is not a so-called parabolic shape, but a columnar shape in which the incident portion 31 to the exit portion 33 are formed in a straight line.

The light guide body 3A according to this modification includes a light guide body 3Aa, a light guide body 3Ab, a light guide body 3Ac, a light guide body 3Ad, and a light guide body 3Ae. The light guide body 3Aa collects and guides the light emitted from the LED 22a. The light guide body 3Ab collects and guides the light emitted from the LED 22b. The light guide body 3Ac collects and guides the light emitted from the LED 22c. The light guide body 3Ad collects and guides the light emitted from the LED 22d. The light guide body 3Ae collects and guides the light emitted from the LED 22e.

Although the light guide body 3A is formed in a columnar shape as described above, the incident surface 31a and the incident surface 31b shown in FIG. 3 may be formed on the portion facing the LED 22.

The shapes shown in FIGS. 4 and 5 have a lower efficiency of light collection in the incident portion 31 than the shapes shown in FIG. This is because the outer shape of the incident portion 31 is not a curved surface (parabolic shape) having a rotating parabolic shape, so that the effect of the reflecting surface 31c cannot be obtained. On the other hand, since it is columnar, it is easier to manufacture than the shapes shown in FIGS. 1 to 3, and the cost can be suppressed.

Further, in the light guide body 3A shown in FIGS. 4 and 5, the surface 33a of the emitting portion 33 is configured so that the emitted light is diffused by embossing or a diffusing member or the like.

The lighting device configured as in the present embodiment can be used as, for example, an indoor footlight. Then, it is possible to perform an effect such as changing the illumination color for each LED 22 or an effect that the illumination seems to move by sequentially lighting the LED 22. At this time, in the present embodiment, in the shape of the light to be combined by being emitted from the emitting portions 33 of the light guide bodies 3a to 3e, the light is neatly combined with few gaps and steps between the emitting portions 33. It is projected as a shape. Therefore, the above effect can be performed more effectively.

According to the present embodiment, the lighting device 1 guides the emitted light corresponding to the plurality of LEDs 22 and the plurality of LEDs 22, and the emitting unit 33 is formed into a predetermined projection shape. It includes 3a to 3e and an imaging lens 4 that forms an image of light emitted from each of the plurality of light guide bodies 3a to 3e at a predetermined position. The surface 33a of the light emitting portions 33 of the light guide bodies 3a to 3e is, for example, textured in order to diffuse the light emitted from the light guide bodies 3a to 3e.

By configuring the lighting device 1 as described above, the light from the LED 22 which is a light source can be collected by the light guide bodies 3a to 3e and guided, so that a mask for forming a desired shape is unnecessary. Further, since the surface 33a of the emitting portion 33 of the light guide bodies 3a to 3e is a diffusion surface, uneven light emission and the like can be suppressed. Further, the number of parts can be reduced, and if the light guides corresponding to the plurality of LEDs 22 are integrally formed, the projection position and the like can be easily adjusted.

Further, by configuring the light guide unit 3 as described above, it is possible to further effectively reduce the size by mounting the LED 22 on the substrate unit 21. As described above, with the above configuration, it is possible to project a desired shape in a suitable state and to reduce costs.

Further, since the incident portion 31 of the light guide body 3 is formed of a curved surface having an outer shape of a rotating parabola, the light incident from the LED 22 can be efficiently collected.

Further, since the light guide body 3 is formed so that the exit portion 32 is thinner than the incident portion 31, the diameter of the imaging lens 4 can be reduced. Therefore, it can contribute to the miniaturization of the lighting device 1.

Further, since the emitting portion 33 is textured, uneven light emission is suppressed and a diffusion surface is directly formed on the light guide body 3 itself, so that a step of attaching a diffusion sheet or the like later is unnecessary. Become.

Further, a diffusion member such as a diffusion sheet may be attached to the emission unit 33. By doing so, it is possible to later form a diffusion surface on the light guide body 3 which has not been textured.

The light guide body may have a shape as shown in FIG. In the lighting device 1B shown in FIG. 6, the light guide body 3B is a frustum cone formed tapered from the incident portion 31 toward the exit portion 33. The light guide body 3B includes a light guide body 3Ba, a light guide body 3Bb, a light guide body 3Bc, a light guide body 3Bd, and a light guide body 3Be. The light guide body 3Ba collects and guides the light emitted from the LED 22a. The light guide body 3Bb collects and guides the light emitted from the LED 22b. The light guide body 3Bc collects and guides the light emitted from the LED 22c. The light guide body 3Bd collects and guides the light emitted from the LED 22d. The light guide body 3Be collects and guides the light emitted from the LED 22e.

The light guide body 3B shown in FIG. 6 does not have a bent portion like the light guide body 3 shown in FIGS. 1, 2 and the like. In the light guide body 3B, depending on the shape of the side surface of the light guide bodies 3Ba to 3Be which are pyramids, the area of the surface 33a which is the exit portion 33 is cut off from the plane parallel to the surface 33a of the incident portion 31. The area is made smaller than the surface having the maximum value, and the surfaces 33a are in contact with each other.

Although the end surface of the incident portion 31 is flat in FIG. 6, the incident surface 31a and the incident surface 31b shown in FIG. 3 may be formed. Alternatively, the outer shape may be a parabolic shape. That is, only the incident portion 31 may be formed into a conical shape, and the light emitting portion 33 may be formed so as to be a pyramid.

According to the light guide body 3B shown in FIG. 6, the diameter of the imaging lens 4 can be reduced, and the manufacturing becomes easy, so that the cost can be suppressed.

Further, the present invention is not limited to the above embodiment. That is, those skilled in the art can carry out various modifications according to conventionally known knowledge within a range that does not deviate from the gist of the present invention. As long as the configuration of the lighting device of the present invention is still provided by such deformation, it is, of course, included in the category of the present invention.

1 Lighting device 3 Light guide 4 Imaging lens (optical member)
22 LED element (light source)
31 Incident part 32 Light guide part 33 Ejecting part (diffusing part)
33a surface

Claims (7)

Light source and
A light guide body that guides the emitted light from the light source and has an emitting portion formed in a predetermined shape.
An optical member that forms an image of the light emitted from the light guide at a predetermined position,
Equipped with
The emitting portion is a diffusion surface that diffuses the light emitted from the light guide.
A lighting device characterized by that. The lighting device according to claim 1, wherein the emitting portion is formed in a shape in which the shape of the surface thereof is projected. The lighting device according to claim 1 or 2, wherein the incident portion of the light guide body is formed of a curved surface having an outer shape of a rotating parabola. The light guide body is characterized in that the area of the surface serving as the emitting portion is smaller than the surface of the incident portion parallel to the surface having the maximum cross-sectional area. The lighting device according to any one of 1 to 3. With multiple light sources
The light guide body is provided with a plurality of light guides so as to guide the emitted light corresponding to the plurality of light sources.
The optical member forms an image of light emitted from each of the plurality of light guide bodies at a predetermined position.
The lighting device according to any one of claims 1 to 4, wherein the lighting device is characterized by the above. The lighting device according to any one of claims 1 to 5, wherein the diffusion surface is formed by applying a textured surface to the surface of the emission portion. The lighting device according to any one of claims 1 to 5, wherein the diffusion surface is formed by attaching a diffusion member to the surface of the emission portion.

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