JP4632311B2 - Lighting equipment - Google Patents

Description

  The present invention includes a light source and a lens for guiding light from the light source. The lens includes an incident surface on which light from the light source is incident and a light emitting surface on which the guided light is emitted. More particularly, the present invention relates to an illumination device that can uniformly emit light on a light emitting surface of a lens without increasing the number of light sources.

  Specifically, the present invention relates to an illumination device that can uniformly emit light on a light emitting surface of a lens without increasing the number of light sources even when a light source with high directivity is used.

  Conventionally, a light source (LED) and a lens (light guide plate) for guiding light from the light source (LED) are provided, and an incident surface (light incident surface) on which light from the light source (LED) is incident. There is also known an illumination device (planar light source) in which a lens (light guide plate) is formed with a light emitting surface (light emitting surface) through which guided light is emitted. As an example of this type of illumination device (planar light source), for example, there is one described in Japanese Patent Application Laid-Open No. 2005-158370.

  In the illumination device (planar light source) described in Japanese Patent Application Laid-Open No. 2005-158370, a light source (LED) is disposed to face an incident surface (light incident surface) of a lens (light guide plate). Furthermore, the light scattering portion is provided in the lens (light guide plate), and the light reflecting portion and the light reflecting film are provided on the surface of the lens (light guide plate) that is orthogonal to the incident surface (light incident surface). Yes.

  Specifically, in the illumination device (planar light source) described in JP-A-2005-158370, when light from a light source (LED) is incident through an incident surface (light incident surface), the light is emitted. Is reflected by the light scattering portion, the light reflecting portion and the light reflecting film toward the light emitting surface (light emitting surface), and then the reflected light is emitted through the light emitting surface (light emitting surface).

  By the way, in the illuminating device (planar light source) described in Unexamined-Japanese-Patent No. 2005-158370, LED with high directivity is used as a light source. That is, in the illumination device (planar light source) described in JP-A-2005-158370, an LED that emits light at a relatively small angle with the main optical axis of the light source is used as the light source.

  Therefore, in the illumination device (planar light source) described in JP-A-2005-158370, light emitted from the light source (LED) does not reach the light scattering portion, the light reflection portion, or the light reflection film. If the light is not reflected by them, it can reach only a narrow region of the light emitting surface (light emitting surface) of the lens (light guide plate) that forms a relatively small angle with the main optical axis of the light source (LED).

  Therefore, in the illumination device (planar light source) described in Japanese Patent Application Laid-Open No. 2005-158370, if light is emitted from the entire light emitting surface (light emitting surface) of the lens (light guide plate), that is, In order to make the light emitting surface (light emitting surface) of the lens (light guide plate) emit light uniformly, a plurality of light sources (LEDs) must be arranged close to each other.

  That is, in the illumination device (planar light source) described in Japanese Patent Application Laid-Open No. 2005-158370, the number of light sources (LEDs) is reduced when the light emitting surface (light emitting surface) of the lens (light guide plate) is caused to emit light uniformly. Must be increased.

JP 2005-158370 A

  In view of the above problems, an object of the present invention is to provide an illumination device that can uniformly emit light on a light emitting surface of a lens without increasing the number of light sources.

  Specifically, the present invention provides an illumination device that can uniformly emit light from a light emitting surface of a lens without increasing the number of light sources even when a light source with high directivity is used. Objective.

According to invention of Claim 1, it comprises the light source and the first lens and the second lens for guiding the light from the light source,
Forming an I-shaped portion having an I-shaped cross-sectional shape and a U-shaped portion having a U-shaped cross-sectional shape on the first lens;
Forming an entrance surface on which the light from the light source is incident on the I-shaped portion;
Forming an emission surface on the I-shaped part from which the light guided through the I-shaped part is emitted;
Forming a U-shaped cross section of the second lens;
Forming an incident surface on the second lens;
Disposing the first lens inside the second lens having a U-shaped cross section;
An air layer is disposed between the exit surface of the I-shaped portion of the first lens and the entrance surface of the second lens;
Part of the light emitted from the light source is incident from the incident surface of the I-shaped portion of the first lens, guided to the U-shaped portion, and the second lens from the outer surface of the U-shaped portion. Is irradiated to the side of
Another part of the light emitted from the light source is incident from the incident surface of the I-shaped portion of the first lens, guided to the I-shaped portion, and between the first lens and the air layer. The angle formed with the main optical axis of the light source is increased by being refracted at the exit surface of the I-shaped portion of the first lens which is a boundary surface, and then the light emitted from the exit surface is An illumination device is provided, which is incident from the incident surface of the second lens and is irradiated from the outer surface of the second lens having a U-shaped cross section to the opposite side of the first lens .

According to the second aspect of the present invention, a light diffusing portion having a light diffusing function is formed on the emission surface of the I-shaped portion of the first lens and / or the incident surface of the second lens. A lighting device according to claim 1 is provided.

In the lighting device according to claim 1, an air layer is disposed between the incident surface and the outer table surface of the second lens of the first lens for guiding light from a light source.

Therefore, according to the illumination device according to claim 1, than if the air layer is not disposed between the entrance surface of the first lens and the outer table surface of the second lens, the light emitted from the light source The angle formed with the main optical axis of the light source can be increased.

As a result, according to the illumination device according to claim 1, than if the air layer is not disposed between the entrance surface and the outer table surface of the second lens of the first lens, the outer table of the second lens Of the surface, the light emitted from the light source can reach a wide area having a relatively large angle with the main optical axis of the light source.

In other words, according to the illumination device according to claim 1, is not disposed an air layer between the entrance face and the outer table surface of the second lens of the first lens, light emitted from the light source, the of the outer table surface of the second lens, than if only a narrow area forming a relatively small angle with the main optical axis of the light source not allowed reach also, it is possible to uniformly emit outer table surface of the second lens.

That is, according to the lighting apparatus according to claim 1, JP-without increasing the number of light sources as illumination apparatus described in 2005-158370, JP-uniformly emit outer table surface of the second lens Can be made.

In particular, according to the illumination device according to claim 1, even if the used high directivity light source, without increasing the number of light sources, evenly emit outer table surface of the second lens Can be made.

In the lighting device according to claim 1, the first lens is arranged to have a U-shaped portion on the inner side of the U-shaped second lens, the outer table surface U-shaped portion of the first lens is formed. Therefore, according to the illumination device according to claim 1, it is irradiated with light emitted from the outer table surface of the outer U-shaped second lens from the outer table surface of the U-shaped portion of the inside of the first lens With light, it is possible to emit light with a sense of depth.

In the lighting device according to claim 2, the light diffusing section having a light diffusing function to the exit surface and / or the incident surface of the second lens of the I-shaped portion of the first lens is formed. Therefore, according to the illumination device according to claim 2, than if the emitting surface and the incident surface of the second lens of the I-shaped portion of the first lens is configured by a flat surface, the outer table surface of the second lens Of these, the light emitted from the light source can reach a wide area having a large angle with the main optical axis of the light source.

  Hereinafter, a first embodiment of the illumination device of the present invention will be described. FIG. 1 is a diagram illustrating a lighting device according to a first embodiment. Specifically, FIG. 1 (A) is a plan view of the lighting device of the first embodiment, FIG. 1 (B) is a front view of the lighting device of the first embodiment, and FIG. 1 (C) is the first embodiment. 1 (D) is a bottom view of the lighting device of the first embodiment, and FIG. 1 (E) is a cross-sectional view taken along line AA of FIG. 1 (A).

  In FIG. 1, S1, S2, S3, S4, S5, and S6 indicate light sources such as LEDs. Reference numerals 1 and 2 denote lenses for guiding light from the light sources S1, S2, S3, S4, S5 and S6. Reference numerals 3 and 4 denote air layers disposed between the lens 1 and the lens 2. Reference numerals 5 and 6 denote support members for supporting the lenses 1 and 2.

  FIG. 2 is a component diagram of the lens 1 shown in FIG. 2A is a plan view of the lens 1, FIG. 2B is a front view of the lens 1, FIG. 2C is a right side view of the lens 1, and FIG. A bottom view and FIG. 2 (E) are perspective views of the lens 1.

  In FIG. 2, reference numeral 1a denotes an incident surface on which light from the light sources S1, S2, S3 (see FIG. 1) is incident. In the illumination device of the first embodiment, as shown in FIGS. 2B, 2D, and 2E, a cylinder obtained by sweeping an arc in the vertical direction of FIG. 2D. Although the incident surface 1a is configured by a part of the surface, in the illumination device of the second embodiment, the incident surface 1a can be configured by an arbitrary surface such as a spherical surface or a flat surface instead. is there.

  In FIG. 2, 1b represents a branching portion, 1c represents a U-shaped portion having a U-shaped cross-sectional shape (see FIG. 2B), and 1d represents an I-shaped cross-sectional shape. (See FIG. 2B). 1c1 indicates the outer surface of the U-shaped portion 1c, 1c2 indicates the inner surface of the U-shaped portion 1c, and 1d1 indicates an emission surface on which light guided through the I-shaped portion 1d is emitted. ing.

  Further, in FIG. 2, 1e indicates an incident surface on which light from the light sources S4, S5, S6 (see FIG. 1) is incident. In the illumination device of the first embodiment, as shown in FIGS. 2B, 2D, and 2E, a cylinder obtained by sweeping an arc in the vertical direction of FIG. 2D. Although the entrance surface 1e is configured by a part of the surface, in the illumination device of the third embodiment, the entrance surface 1e can be configured by an arbitrary surface such as a spherical surface or a plane instead. is there.

  In FIG. 2, 1 f indicates a branch portion, and 1 g indicates an I-shaped portion having an I-shaped cross-sectional shape (see FIG. 2B). Reference numeral 1g1 denotes an emission surface from which light guided through the I-shaped portion 1g is emitted.

  FIG. 3 is a component diagram of the lens 2 shown in FIG. Specifically, FIG. 3A is a plan view of the lens 2, FIG. 3B is a front view of the lens 2, FIG. 3C is a right side view of the lens 2, and FIG. A bottom view and FIG. 3 (E) are perspective views of the lens 2.

  In FIG. 3, 2a indicates an incident surface on which the light emitted from the exit surface 1d1 of the lens 1 is incident, and 2b indicates an incident surface on which the light emitted from the exit surface 1g1 of the lens 1 is incident. Show. In the illumination device of the first embodiment, as shown in FIGS. 3B, 3D, and 3E, the incident surfaces 2a and 2b are configured by planes. In the illumination device of the embodiment, the incident surfaces 2a and 2b can be configured by an arbitrary surface such as a part of a cylindrical surface obtained by sweeping an arc in the vertical direction of FIG. 3D instead. It is.

  In FIG. 3, 2c shows the outer surface of the lens 2 having a U-shaped cross-sectional shape (see FIG. 3B), and 2d shows the inner surface of the lens 2 having a U-shaped cross-sectional shape. (See FIG. 3B).

  4 to 6 are diagrams showing optical paths of light emitted from the light sources S1, S2, S3, S4, S5 and S6. Specifically, FIG. 4 (A) is a diagram showing how light emitted from the light sources S1 and S4 is diffused in the left-right direction of the illumination device of the first embodiment, and FIG. 4 (B) is a diagram illustrating light sources S2 and S5. The figure which showed a mode that the light radiated | emitted from the left-right direction of the illuminating device of 1st Embodiment was diffused, FIG.4 (C) is the illuminating device of 1st Embodiment with the light radiated | emitted from light source S3, S6. It is the figure which showed a mode that it spread | diffused in the left-right direction.

  FIG. 5A shows a state in which light emitted from the light source S1 is diffused in the front-rear direction of the lighting apparatus of the first embodiment, and FIG. 5B shows light emitted from the light source S2. The figure which showed a mode that it diffused in the front-back direction of the illuminating device of 1st Embodiment, FIG.5 (C) shows a mode that the light radiated | emitted from light source S3 diffuses in the front-back direction of the illuminating device of 1st Embodiment. FIG. Further, FIG. 6A is a diagram showing how light emitted from the light source S6 diffuses in the front-rear direction of the illumination device of the first embodiment, and FIG. 6B shows light emitted from the light source S5. The figure which showed a mode that it diffused in the front-back direction of the illuminating device of 1st Embodiment, FIG.6 (C) shows a mode that the light radiated | emitted from light source S4 diffuses in the front-back direction of the illuminating device of 1st Embodiment. FIG.

  4 to 6, L1 indicates the main optical axis of the light source S1, L2 indicates the main optical axis of the light source S2, L3 indicates the main optical axis of the light source S3, and L4 indicates the light source S4. L5 indicates the main optical axis of the light source S5, and L6 indicates the main optical axis of the light source S6.

  In the illumination device according to the first embodiment, as shown in FIGS. 2B and 4A, a part of the light emitted from the light source S1 passes through the incident surface 1a and the branching portion 1b of the lens 1. Then, the light is guided to the U-shaped portion 1c and irradiated to the lens 2 side (the upper side in FIG. 4A) via the outer surface 1c1 of the U-shaped portion 1c. That is, the outer surface 1c1 of the U-shaped portion 1c of the lens 1 is caused to emit light by the light from the light source S1.

  Further, in the illumination device of the first embodiment, as shown in FIGS. 2B, 3B, and 4A, a part of the light emitted from the light source S1 is incident on the lens 1. The light is guided to the I-shaped portion 1d through the surface 1a and the branching portion 1b, and is emitted from the emission surface 1d1. Next, the light is incident from the incident surface 2 a of the lens 2 and is irradiated to the outside of the lens 2 through the outer surface 2 c of the lens 2. That is, the outer surface 2c of the lens 2 is caused to emit light by the light from the light source S1.

  Specifically, in the illumination device according to the first embodiment, as shown in FIG. 5A, the light emitted from the light source S1 at an angle θ1 with the main optical axis L1 of the light source S1 is transmitted to the lens 1 and the air. The light is refracted at the exit surface 1 d 1 of the lens 1, which is a boundary surface with the layer 3. As a result, the angle θ1 ′ (> θ1) formed by the light emitted from the exit surface 1d1 of the lens 1 and the main optical axis L1 of the light source S1 is increased. Next, light whose angle θ1 ′ formed with the main optical axis L1 of the light source S1 is increased is incident from the incident surface 2a of the lens 2, and the lens 2 passes through the outer surface 2c of the lens 2 as described above. (See FIGS. 3B and 4A).

  That is, in the illumination device of the first embodiment, as shown in FIG. 5A, air for increasing the angles θ1 and θ1 ′ that the light emitted from the light source S1 makes with the main optical axis L1 of the light source S1. The layer 3 is disposed between the incident surface 1a of the lens 1 (see FIG. 2B) and the outer surface 2c as the light emitting surface of the lens 2.

  Therefore, according to the illumination device of the first embodiment, the angle θ1 ′ (> θ1) formed by the light emitted from the light source S1 and the main optical axis L1 of the light source S1 is greater than when the air layer 3 is not provided. Can be increased. As a result, according to the illuminating device of the first embodiment, the main optical axis L1 of the light source S1 is relatively out of the outer surface 2c as the light emitting surface of the lens 2 as compared with the case where the air layer 3 is not provided. The light emitted from the light source S1 can reach a wide area having a large angle. In other words, according to the illumination device of the first embodiment, the outer surface 2c as the light emitting surface of the lens 2 is farther from the main optical axis L1 of the light source S1 than when the air layer 3 is not provided. The light emitted from the light source S1 can be made to reach the region.

  Furthermore, in the illumination device of the first embodiment, as shown in FIGS. 2B and 4B, a part of the light emitted from the light source S2 is converted into the incident surface 1a and the branching portion 1b of the lens 1. Then, the light is guided to the U-shaped portion 1c through the lens 2 and irradiated to the lens 2 side (the upper side in FIG. 4B) through the outer surface 1c1 of the U-shaped portion 1c. That is, the outer surface 1c1 of the U-shaped portion 1c of the lens 1 is caused to emit light by the light from the light source S2.

  Further, in the illumination device of the first embodiment, as shown in FIGS. 2B, 3B, and 4B, part of the light emitted from the light source S2 is incident on the lens 1. The light is guided to the I-shaped portion 1d through the surface 1a and the branching portion 1b, and is emitted from the emission surface 1d1. Next, the light is incident from the incident surface 2 a of the lens 2 and is irradiated to the outside of the lens 2 through the outer surface 2 c of the lens 2. That is, the outer surface 2c of the lens 2 is caused to emit light by the light from the light source S2.

  Specifically, in the illumination device of the first embodiment, as shown in FIG. 5B, the light emitted from the light source S2 at an angle θ2 with the main optical axis L2 of the light source S2 is transmitted to the lens 1 and the air. The light is refracted at the exit surface 1 d 1 of the lens 1, which is a boundary surface with the layer 3. As a result, the angle θ2 ′ (> θ2) formed by the light emitted from the exit surface 1d1 of the lens 1 and the main optical axis L2 of the light source S2 is increased. Next, light whose angle θ2 ′ formed with the main optical axis L2 of the light source S2 is increased is incident from the incident surface 2a of the lens 2, and as described above, the lens 2 passes through the outer surface 2c of the lens 2. (See FIGS. 3B and 4B).

  That is, in the illumination device of the first embodiment, as shown in FIG. 5B, air for increasing the angles θ2 and θ2 ′ that the light emitted from the light source S2 makes with the main optical axis L2 of the light source S2. The layer 3 is disposed between the incident surface 1a of the lens 1 (see FIG. 2B) and the outer surface 2c as the light emitting surface of the lens 2.

  Therefore, according to the illuminating device of the first embodiment, the angle θ2 ′ (> θ2) that the light emitted from the light source S2 forms with the main optical axis L2 of the light source S2 as compared with the case where the air layer 3 is not provided. Can be increased. As a result, according to the illuminating device of the first embodiment, the main optical axis L2 of the light source S2 is relatively out of the outer surface 2c as the light emitting surface of the lens 2 as compared with the case where the air layer 3 is not provided. The light radiated from the light source S2 can reach a wide area having a large angle. In other words, according to the illumination device of the first embodiment, the outer surface 2c as the light emitting surface of the lens 2 is farther from the main optical axis L2 of the light source S2 than when the air layer 3 is not provided. The light emitted from the light source S2 can be made to reach the area.

  Therefore, according to the illumination device of the first embodiment, the air layer 3 is not provided, and the light emitted from the light source S1 is the main light of the light source S1 among the outer surface 2c as the light emitting surface of the lens 2. Only the region close to the axis L1 can be reached, and the light emitted from the light source S2 can reach only the region near the main optical axis L2 of the light source S2 on the outer surface 2c as the light emitting surface of the lens 2. The region between the main optical axis L1 of the light source S1 and the main optical axis L2 of the light source S2 in the outer surface 2c as the light emitting surface of the lens 2 can be made to emit light more uniformly.

  That is, according to the illumination device of the first embodiment, it is not necessary to add a further light source between the light source S1 and the light source S2, and the main light of the light source S1 among the outer surface 2c as the light emitting surface of the lens 2 is obtained. A region between the axis L1 and the main optical axis L2 of the light source S2 can be emitted uniformly.

  In detail, according to the illuminating device of 1st Embodiment, even if it is a case where LED with high directivity is used as light source S1, S2, a further light source is added between light source S1 and light source S2. The area between the main optical axis L1 of the light source S1 and the main optical axis L2 of the light source S2 in the outer surface 2c as the light emitting surface of the lens 2 can be uniformly emitted without need.

  Furthermore, in the illumination device of the first embodiment, as shown in FIGS. 2B and 4C, part of the light emitted from the light source S3 is converted into the incident surface 1a and the branching portion 1b of the lens 1. Is guided to the U-shaped portion 1c, and is irradiated to the lens 2 side (upper side in FIG. 4C) via the outer surface 1c1 of the U-shaped portion 1c. That is, the outer surface 1c1 of the U-shaped portion 1c of the lens 1 is caused to emit light by the light from the light source S3.

  Further, in the illumination device of the first embodiment, as shown in FIGS. 2B, 3B, and 4C, part of the light emitted from the light source S3 is incident on the lens 1. The light is guided to the I-shaped portion 1d through the surface 1a and the branching portion 1b, and is emitted from the emission surface 1d1. Next, the light is incident from the incident surface 2 a of the lens 2 and is irradiated to the outside of the lens 2 through the outer surface 2 c of the lens 2. That is, the outer surface 2c of the lens 2 is caused to emit light by the light from the light source S3.

  Specifically, in the illumination device according to the first embodiment, as shown in FIG. 5C, the light emitted from the light source S3 at an angle θ3 with the main optical axis L3 of the light source S3 is transmitted between the lens 1 and the air. The light is refracted at the exit surface 1 d 1 of the lens 1, which is a boundary surface with the layer 3. As a result, the angle θ3 ′ (> θ3) that the light emitted from the exit surface 1d1 of the lens 1 makes with the main optical axis L3 of the light source S3 is increased. Next, light whose angle θ3 ′ formed with the main optical axis L3 of the light source S3 is increased is incident from the incident surface 2a of the lens 2 and, as described above, the lens 2 through the outer surface 2c of the lens 2. (See FIGS. 3B and 4C).

  That is, in the illumination device of the first embodiment, as shown in FIG. 5C, air for increasing the angles θ3 and θ3 ′ formed by the light emitted from the light source S3 and the main optical axis L3 of the light source S3. The layer 3 is disposed between the incident surface 1a of the lens 1 (see FIG. 2B) and the outer surface 2c as the light emitting surface of the lens 2.

  Therefore, according to the illuminating device of the first embodiment, the angle θ3 ′ (> θ3) formed by the light emitted from the light source S3 and the main optical axis L3 of the light source S3 as compared with the case where the air layer 3 is not provided. Can be increased. As a result, according to the illuminating device of the first embodiment, the main optical axis L3 of the light source S3 is relatively out of the outer surface 2c as the light emitting surface of the lens 2 as compared with the case where the air layer 3 is not provided. Light emitted from the light source S3 can reach a wide area having a large angle. In other words, according to the illumination device of the first embodiment, the outer surface 2c as the light emitting surface of the lens 2 is farther from the main optical axis L3 of the light source S3 than when the air layer 3 is not provided. The light emitted from the light source S3 can be made to reach the region.

  Therefore, according to the illumination device of the first embodiment, the air layer 3 is not provided, and the light emitted from the light source S2 is the main light of the light source S2 in the outer surface 2c as the light emitting surface of the lens 2. Only the region near the axis L2 can be reached, and the light emitted from the light source S3 can reach only the region near the main optical axis L3 of the light source S3 on the outer surface 2c as the light emitting surface of the lens 2. The region between the main optical axis L2 of the light source S2 and the main optical axis L3 of the light source S3 in the outer surface 2c as the light emitting surface of the lens 2 can be made to emit light more uniformly than in the case.

  That is, according to the illumination device of the first embodiment, it is not necessary to add a further light source between the light source S2 and the light source S3, and the main light of the light source S2 out of the outer surface 2c as the light emitting surface of the lens 2. A region between the axis L2 and the main optical axis L3 of the light source S3 can be emitted uniformly.

  In detail, according to the illuminating device of 1st Embodiment, even if it is a case where LED with high directivity is used as light source S2, S3, a further light source is added between light source S2 and light source S3. The area between the main optical axis L2 of the light source S2 and the main optical axis L3 of the light source S3 in the outer surface 2c as the light emitting surface of the lens 2 can be uniformly emitted without need.

  Furthermore, in the illumination device of the first embodiment, as shown in FIGS. 2B and 4A, a part of the light emitted from the light source S4 is converted into the incident surface 1e and the branching portion 1f of the lens 1. Then, the light is guided to the U-shaped portion 1c through the lens 2 and irradiated to the lens 2 side (the upper side in FIG. 4A) through the outer surface 1c1 of the U-shaped portion 1c. That is, the outer surface 1c1 of the U-shaped portion 1c of the lens 1 is caused to emit light by the light from the light source S4.

  Further, in the illumination device of the first embodiment, as shown in FIGS. 2B, 3B, and 4A, part of the light emitted from the light source S4 is incident on the lens 1. The light is guided to the I-shaped portion 1g through the surface 1e and the branching portion 1f, and is emitted from the emission surface 1g1. Next, the light is incident from the incident surface 2 b of the lens 2 and is irradiated to the outside of the lens 2 through the outer surface 2 c of the lens 2. That is, the outer surface 2c of the lens 2 is caused to emit light by the light from the light source S4.

  Specifically, in the illumination device of the first embodiment, as shown in FIG. 6C, the light emitted from the light source S4 at an angle θ4 with the main optical axis L4 of the light source S4 is transmitted to the lens 1 and the air. The light is refracted at the exit surface 1g1 of the lens 1 which is a boundary surface with the layer 4. As a result, the angle θ4 ′ (> θ4) formed by the light emitted from the exit surface 1g1 of the lens 1 and the main optical axis L4 of the light source S4 is increased. Next, light whose angle θ4 ′ formed with the main optical axis L4 of the light source S4 is increased is incident from the incident surface 2b of the lens 2, and the lens 2 passes through the outer surface 2c of the lens 2 as described above. (See FIGS. 3B and 4A).

  That is, in the illuminating device of the first embodiment, as shown in FIG. 6C, air for increasing the angles θ4 and θ4 ′ formed by the light emitted from the light source S4 and the main optical axis L4 of the light source S4. The layer 4 is disposed between the incident surface 1e of the lens 1 (see FIG. 2B) and the outer surface 2c as the light emitting surface of the lens 2.

  Therefore, according to the illuminating device of the first embodiment, the angle θ4 ′ (> θ4) formed by the light emitted from the light source S4 and the main optical axis L4 of the light source S4 as compared with the case where the air layer 4 is not provided. Can be increased. As a result, according to the illumination device of the first embodiment, the main optical axis L4 of the light source S4 is relatively out of the outer surface 2c as the light emitting surface of the lens 2 as compared with the case where the air layer 4 is not provided. The light radiated from the light source S4 can reach a wide area having a large angle. In other words, according to the illumination device of the first embodiment, the outer surface 2c as the light emitting surface of the lens 2 is farther from the main optical axis L4 of the light source S4 than when the air layer 4 is not provided. The light emitted from the light source S4 can be made to reach the area.

  Furthermore, in the illumination device of the first embodiment, as shown in FIGS. 2B and 4B, a part of the light emitted from the light source S5 is converted into the incident surface 1e and the branching portion 1f of the lens 1. Then, the light is guided to the U-shaped portion 1c through the lens 2 and irradiated to the lens 2 side (the upper side in FIG. 4B) through the outer surface 1c1 of the U-shaped portion 1c. That is, the outer surface 1c1 of the U-shaped portion 1c of the lens 1 is caused to emit light by the light from the light source S5.

  Further, in the illumination device of the first embodiment, as shown in FIGS. 2B, 3B, and 4B, part of the light emitted from the light source S5 is incident on the lens 1. The light is guided to the I-shaped portion 1g through the surface 1e and the branching portion 1f, and is emitted from the emission surface 1g1. Next, the light is incident from the incident surface 2 b of the lens 2 and is irradiated to the outside of the lens 2 through the outer surface 2 c of the lens 2. That is, the outer surface 2c of the lens 2 is caused to emit light by the light from the light source S5.

  Specifically, in the illumination device according to the first embodiment, as shown in FIG. 6B, the light emitted from the light source S5 at an angle θ5 with the main optical axis L5 of the light source S5 is reflected between the lens 1 and the air. The light is refracted at the exit surface 1g1 of the lens 1 which is a boundary surface with the layer 4. As a result, the angle θ5 ′ (> θ5) that the light emitted from the exit surface 1g1 of the lens 1 makes with the main optical axis L5 of the light source S5 is increased. Next, light whose angle θ5 ′ formed with the main optical axis L5 of the light source S5 is increased is incident from the incident surface 2b of the lens 2 and, as described above, the lens 2 through the outer surface 2c of the lens 2. (See FIGS. 3B and 4B).

  That is, in the illumination device of the first embodiment, as shown in FIG. 6B, air for increasing the angles θ5 and θ5 ′ that the light emitted from the light source S5 makes with the main optical axis L5 of the light source S5. The layer 4 is disposed between the incident surface 1e (see FIG. 2B) of the lens 1 and the outer surface 2c as the light emitting surface of the lens 2.

  Therefore, according to the illuminating device of the first embodiment, the angle θ5 ′ (> θ5) formed by the light emitted from the light source S5 and the main optical axis L5 of the light source S5 as compared with the case where the air layer 4 is not provided. Can be increased. As a result, according to the illuminating device of the first embodiment, the outer surface 2c as the light emitting surface of the lens 2 is relatively in comparison with the main optical axis L5 of the light source S5, compared with the case where the air layer 4 is not provided. The light emitted from the light source S5 can reach a wide area having a large angle. In other words, according to the illumination device of the first embodiment, the outer surface 2c as the light emitting surface of the lens 2 is farther from the main optical axis L5 of the light source S5 than when the air layer 4 is not provided. The light emitted from the light source S5 can be made to reach the area.

  Therefore, according to the illumination device of the first embodiment, the air layer 4 is not provided, and the light emitted from the light source S4 is the main light of the light source S4 out of the outer surface 2c as the light emitting surface of the lens 2. Only the region close to the axis L4 can be reached, and the light emitted from the light source S5 can reach only the region near the main optical axis L5 of the light source S5 in the outer surface 2c as the light emitting surface of the lens 2. The region between the main optical axis L4 of the light source S4 and the main optical axis L5 of the light source S5 in the outer surface 2c as the light emitting surface of the lens 2 can be made to emit light more uniformly than in the case.

  That is, according to the illumination device of the first embodiment, it is not necessary to add a further light source between the light sources S4 and S4, and the main light of the light source S4 among the outer surface 2c as the light emitting surface of the lens 2 is obtained. A region between the axis L4 and the main optical axis L5 of the light source S5 can be emitted uniformly.

  Specifically, according to the illumination device of the first embodiment, even when a highly directional LED is used as the light sources S4 and S5, a further light source is added between the light sources S4 and S5. The region between the main optical axis L4 of the light source S4 and the main optical axis L5 of the light source S5 can be uniformly emitted on the outer surface 2c as the light emitting surface of the lens 2 without necessity.

  Furthermore, in the illumination device of the first embodiment, as shown in FIGS. 2B and 4C, a part of the light emitted from the light source S6 is converted into the incident surface 1e and the branching portion 1f of the lens 1. Is guided to the U-shaped portion 1c, and is irradiated to the lens 2 side (upper side in FIG. 4C) via the outer surface 1c1 of the U-shaped portion 1c. That is, the outer surface 1c1 of the U-shaped portion 1c of the lens 1 is caused to emit light by the light from the light source S6.

  Further, in the illumination device of the first embodiment, as shown in FIGS. 2B, 3B, and 4C, part of the light emitted from the light source S6 is incident on the lens 1. The light is guided to the I-shaped portion 1g through the surface 1e and the branching portion 1f, and is emitted from the emission surface 1g1. Next, the light is incident from the incident surface 2 b of the lens 2 and is irradiated to the outside of the lens 2 through the outer surface 2 c of the lens 2. That is, the outer surface 2c of the lens 2 is caused to emit light by the light from the light source S6.

  Specifically, in the illumination device according to the first embodiment, as shown in FIG. 6A, the light emitted from the light source S6 at an angle θ6 with the main optical axis L6 of the light source S6 is reflected between the lens 1 and the air. The light is refracted at the exit surface 1g1 of the lens 1 which is a boundary surface with the layer 4. As a result, the angle θ6 ′ (> θ6) formed by the light emitted from the exit surface 1g1 of the lens 1 and the main optical axis L6 of the light source S6 is increased. Next, light whose angle θ6 ′ formed with the main optical axis L6 of the light source S6 is increased is incident from the incident surface 2b of the lens 2 and, as described above, the lens 2 through the outer surface 2c of the lens 2. (See FIGS. 3B and 4C).

  That is, in the illumination device of the first embodiment, as shown in FIG. 6A, air for increasing the angles θ6 and θ6 ′ formed by the light emitted from the light source S6 and the main optical axis L6 of the light source S6. The layer 4 is disposed between the incident surface 1e of the lens 1 (see FIG. 2B) and the outer surface 2c as the light emitting surface of the lens 2.

  Therefore, according to the illuminating device of the first embodiment, the angle θ6 ′ (> θ6) formed by the light emitted from the light source S6 and the main optical axis L6 of the light source S6 as compared with the case where the air layer 4 is not provided. Can be increased. As a result, according to the illuminating device of the first embodiment, the main optical axis L6 of the light source S6 is relatively out of the outer surface 2c as the light emitting surface of the lens 2 as compared with the case where the air layer 4 is not provided. The light emitted from the light source S6 can reach a wide area having a large angle. In other words, according to the illumination device of the first embodiment, the outer surface 2c as the light emitting surface of the lens 2 is farther from the main optical axis L6 of the light source S6 than when the air layer 4 is not provided. The light emitted from the light source S6 can be made to reach the area.

  Therefore, according to the illumination device of the first embodiment, the air layer 4 is not provided, and the light emitted from the light source S5 is the main light of the light source S5 in the outer surface 2c as the light emitting surface of the lens 2. Only the region near the axis L5 can be reached, and the light emitted from the light source S6 can reach only the region near the main optical axis L6 of the light source S6 on the outer surface 2c as the light emitting surface of the lens 2. The region between the main optical axis L5 of the light source S5 and the main optical axis L6 of the light source S6 in the outer surface 2c as the light emitting surface of the lens 2 can be made to emit light more uniformly.

  That is, according to the illumination device of the first embodiment, it is not necessary to add a further light source between the light sources S5 and S6, and the main light of the light source S5 among the outer surface 2c as the light emitting surface of the lens 2 is obtained. A region between the axis L5 and the main optical axis L6 of the light source S6 can be emitted uniformly.

  Specifically, according to the illumination device of the first embodiment, even if a highly directional LED is used as the light sources S5 and S6, a further light source is added between the light sources S5 and S6. The area between the main optical axis L5 of the light source S5 and the main optical axis L6 of the light source S6 can be uniformly emitted on the outer surface 2c as the light emitting surface of the lens 2 without necessity.

  Moreover, in the illuminating device of 1st Embodiment, as shown to FIG. 2 (B), FIG.3 (B), and FIG. 4, the U-shaped part 1c of the lens 1 is arrange | positioned inside the U-shaped lens 2, An outer surface 1c1 of the U-shaped portion 1c of the lens 1 is used as a light emitting surface. Therefore, according to the illuminating device of 1st Embodiment, the light irradiated from the outer surface 2c as a light emission surface of the outer U-shaped lens 2, and the light emission surface of the U-shaped part 1c of the inner lens 1 are used. With the light irradiated from the outer surface 1c1, light with a sense of depth can be irradiated.

Furthermore, in the illumination device of the first embodiment, as shown in FIGS. 2B, 3B, and 4, the entrance surface 2a of the outer U-shaped lens 2 and the U-shape of the inner lens 1 are used. part 1 and c, are optically connected via a branch portion 1b. In other words, in the illuminating device of the first embodiment, the light sources S1, S2, S3 for causing the outer surface 2c as the light emitting surface of the outer U-shaped lens 2 to emit light are U-shaped portions of the inner lens 1. It is used for causing the outer surface 1c1 as the light emitting surface 1c to emit light.

Moreover, in the illuminating device of 1st Embodiment, as shown in FIG.2 (B), FIG.3 (B), and FIG. 4, the entrance surface 2e of the outer U-shaped lens 2 and U shape of the inner lens 1 are shown. part 1 and c, are optically connected via a branch portion 1f. In other words, in the illumination device of the first embodiment, the light sources S4, S5, and S6 for emitting the outer surface 2c as the light emitting surface of the outer U-shaped lens 2 are the U-shaped portions of the inner lens 1. It is used for causing the outer surface 1c1 as the light emitting surface 1c to emit light.

  Therefore, according to the illuminating device of 1st Embodiment, without increasing the number of light sources, the light irradiated from the outer surface 2c as a light emission surface of the outer U-shaped lens 2, and the inner lens 1 Light with a sense of depth can be emitted by the light emitted from the outer surface 1c1 as the light emitting surface of the U-shaped portion 1c.

  In the illuminating device of the first embodiment, as shown in FIG. 2 (E), the exit surfaces 1d1 and 1g1 of the lens 1 as the boundary surfaces between the lens 1 and the air layers 3 and 4 are configured by planes. As shown in (D), the incident surfaces 2a and 2b of the lens 2 as a boundary surface between the lens 2 and the air layers 3 and 4 are configured by planes. In the illumination device of the fifth embodiment, instead, In addition, the exit surfaces 1d1 and 1g1 of the lens 1 as a boundary surface between the lens 1 and the air layers 3 and 4, and / or the entrance surface 2a of the lens 2 as a boundary surface between the lens 2 and the air layers 3 and 4, It is also possible to provide 2b with a diffusion function such as lens cutting and embossing.

  According to the illumination device of the fifth embodiment, the exit surfaces 1d1 and 1g1 of the lens 1 as a boundary surface between the lens 1 and the air layers 3 and 4 are configured by planes, and the lens 2 and the air layers 3 and 4 Compared to the illumination device of the first embodiment in which the incident surfaces 2a and 2b of the lens 2 as the boundary surfaces are flat, the light sources S1, S2, S3 of the outer surface 2c as the light emitting surface of the lens 2 The light emitted from the light sources S1, S2, S3, S4, S5, and S6 can reach a wide area having a large angle with the main optical axes L1, L2, L3, L4, L5, and L6 of S4, S5, and S6. it can.

  In other words, according to the illumination device of the fifth embodiment, the main optical axis L1 of the light source S1 and the light source S2 of the outer surface 2c as the light emitting surface of the lens 2 than the illumination device of the first embodiment. A region between the main optical axis L2 of the light source S2, a region between the main optical axis L2 of the light source S2 and the main optical axis L3 of the light source S3, and between the main optical axis L4 of the light source S4 and the main optical axis L5 of the light source S5. And a region between the main optical axis L5 of the light source S5 and the main optical axis L6 of the light source S6 can be emitted uniformly.

  In the illumination device of the first embodiment, diffusion such as lens cutting and embossing is applied to the outer surface 1c1 and the inner surface 1c2 of the U-shaped portion 1c of the lens 1 and the outer surface 2c and the inner surface 2d of the lens 2. Although the function is not provided, in the illumination device of the sixth embodiment, instead, the outer surface 1c1 and the inner surface 1c2 of the U-shaped portion 1c of the lens 1 and the outer surface 2c and the inner surface 2d of the lens 2 are provided. For example, it is possible to provide a diffusion function such as lens cutting and embossing.

In the illumination device of the first embodiment, the lenses 1 and 2 formed by separate members are supported by the support members 5 and 6, but in the illumination device according to the invention related to the present invention , the lenses 1 and 2 are integrated. It is also possible to provide the air layers 3 and 4 by forming holes in the lenses 1 and 2 as well as forming them by members.

In the illumination device of the first embodiment, six light sources S1, S2, S3, S4, S5, and S6 are provided. However, in the illumination device of the seventh embodiment, an arbitrary number of two or more is provided. A light source can be provided.

FIG. 7 is a view showing an illumination apparatus according to the eighth embodiment. The illumination device of the exemplary embodiment, as shown in FIG. 2 (B), the U-shaped portion 1c of the lens 1 is the outer surface 1c1 and the inner surface 1c2 is formed by a curved surface, of the eighth embodiment In the illuminating device, as shown in FIG. 7, the outer surface 1c1 ′ and the inner surface 1c2 ′ of the U-shaped portion 1c ′ of the lens 1 ′ are configured by planes.

In the ninth embodiment, it is also possible to combine appropriately the eighth embodiment from the first described above.

  The illuminating device of the present invention is applicable to a vehicular lamp such as a rear combination lamp, a general illuminating lamp such as a downlight, an amusement device lighting device, and the like.

It is the figure which showed the illuminating device of 1st Embodiment. FIG. 2 is a component diagram of the lens 1 shown in FIG. 1. FIG. 2 is a component diagram of the lens 2 shown in FIG. 1. It is the figure which showed the optical path of the light radiated | emitted from light source S1, S2, S3, S4, S5, S6. It is the figure which showed the optical path of the light radiated | emitted from light source S1, S2, S3, S4, S5, S6. It is the figure which showed the optical path of the light radiated | emitted from light source S1, S2, S3, S4, S5, S6. It is the figure which showed the illuminating device of 8th Embodiment.

Explanation of symbols

S1, S2, S3, S4, S5, S6 Light source L1, L2, L3, L4, L5, L6 Main optical axis 1 Lens 1a Incident surface 1b Branching portion 1c U-shaped portion 1c1 Outer surface 1c2 Inner surface 1d I-shaped portion 1d1 Emission Surface 1e Incident surface 1f Branch 1g I-shaped portion 1g1 Outgoing surface 2 Lens 2a Incident surface 2b Incident surface 2c Outer surface 2d Inner surface 3, 4 Air layer

Claims (2)

Comprising a light source, and a first lens and a second lens for guiding light from the light source,
Forming an I-shaped portion having an I-shaped cross-sectional shape and a U-shaped portion having a U-shaped cross-sectional shape on the first lens;
Forming an entrance surface on which the light from the light source is incident on the I-shaped portion;
Forming an emission surface on the I-shaped portion from which light guided through the I-shaped portion is emitted;
Forming a U-shaped cross section of the second lens;
Forming an incident surface on the second lens;
Disposing the first lens inside the second lens having a U-shaped cross section;
An air layer is disposed between the exit surface of the I-shaped portion of the first lens and the entrance surface of the second lens;
Part of the light emitted from the light source is incident from the incident surface of the I-shaped portion of the first lens, guided to the U-shaped portion, and the second lens from the outer surface of the U-shaped portion. Is irradiated to the side of
Another part of the light emitted from the light source is incident from the incident surface of the I-shaped portion of the first lens, guided to the I-shaped portion, and between the first lens and the air layer. The angle formed with the main optical axis of the light source is increased by being refracted at the exit surface of the I-shaped portion of the first lens which is a boundary surface, and then the light emitted from the exit surface is The illumination device, which is incident from the incident surface of the second lens and is irradiated on the opposite side of the first lens from the outer surface of the second lens having a U-shaped cross section . 2. The illumination device according to claim 1, wherein a light diffusion portion having a light diffusion function is formed on the emission surface of the I-shaped portion of the first lens and / or the incident surface of the second lens. .

Images