JP2013037918A - Lighting device - Google Patents

Abstract

[PROBLEMS] To perform light distribution control with higher accuracy than in the past.
An illumination device 1 is arranged in front of an LED 12 that emits light substantially radially around an optical axis Ax, and the light emitted from the LED 12 is converted into parallel light in the direction of the optical axis Ax. An inner lens 13 and an outer lens 14 that is disposed in front of the inner lens 13 and has lens cuts 140,... For deflecting light that has been converted into parallel light by the inner lens 13 is provided.
[Selection] Figure 4

Description

  The present invention relates to a lighting device.

  2. Description of the Related Art Conventionally, as an illuminating device used for, for example, a street lamp, a device that deflects light emitted from an LED in a predetermined direction by an optical system such as a lens is known (for example, see Patent Document 1).

  As shown in FIG. 10, the illumination device described in Patent Document 1 includes an LED 81 and a lens 82 disposed in front of the LED 81. A concave portion 82a formed to cover the LED 81 is provided at the rear portion of the lens 82, and the bottom surface of the concave portion 82a is a convex surface that refracts light from the LED 81 and enters the lens 82. Yes. The side peripheral surface 82b of the lens 82 is a surface that internally reflects light of the LED 81 that has entered the lens 82 from the inner peripheral surface of the recess 82a. Further, a plurality of sawtooth lens cuts 82c,... Are formed on the front surface (outgoing surface) of the lens 82.

  With such a configuration, the illuminating device described in Patent Document 1 causes the light emitted from the LED 81 to enter the lens 82 through the concave portion 82a and the side peripheral surface 82b, and then convert the light into parallel light forward. Are emitted from the lens 82 while being deflected in a predetermined direction by the lens cuts 82c,.

Japanese translation of PCT publication No. 2002-528861

  However, in the illumination device described in Patent Document 1, the concave portion 82a and the side peripheral surface 82b, which are light distribution control elements that convert the light from the LED 81 into parallel light, and the lens that is a light distribution control element that deflects the parallel light. Since the cuts 82c,... Are integrally configured, it is difficult to process and mold them with good accuracy. As a result, the light distribution control is reduced due to the decrease in the processing and molding accuracy. Accuracy is also reduced.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the illuminating device which can perform highly accurate light distribution control compared with the past.

In order to solve the above-mentioned problem, the invention according to claim 1 is a lighting device,
LEDs that emit light substantially radially around the optical axis;
An optical system that is arranged in front of the LED, and converts the light emitted from the LED into parallel light in the optical axis direction along the optical axis;
A lens having a lens cut that is disposed in front of the optical system and deflects the light that has been converted into parallel light by the optical system;
It is characterized by providing.

Invention of Claim 2 is the illuminating device of Claim 1,
The optical system is an inner lens,
The inner lens is
A first incident surface that is provided at a position facing the LED and that enters the inner lens while refracting light emitted from the LED in the optical axis direction;
A second incident surface that is erected from the end of the first incident surface to the LED side, and that emits light emitted from the LED and directed laterally from the first incident surface into the inner lens;
An internal reflection surface that is formed so as to spread outward from the tip of the second incident surface toward the optical axis direction, and internally reflects light incident from the second incident surface into the inner lens in the optical axis direction; ,
It is characterized by having.

The invention according to claim 3 is the lighting device according to claim 1,
The optical system is a parabolic surface having the optical axis as a central axis, and is a reflective surface in which the LED is arranged at the focal point.

  According to the present invention, an optical system that is arranged in the optical axis direction of the LED and that makes the light emitted from the LED parallel to the optical axis direction, and an optical system that is arranged in the optical axis direction of the optical system, the optical system And a lens having a lens cut that deflects the light that has been converted into parallel light in the light distribution control element that makes the light from the LED parallel light, and a light distribution control element that deflects the parallel light (lens cut) Can be processed and molded individually. Therefore, compared with the conventional case in which these two light distribution control elements are integrally formed, the two light distribution control elements can be easily processed and molded, thereby realizing highly accurate light distribution control. Can do.

It is a perspective view of the illuminating device in 1st embodiment. It is a vertical sectional view of the lamp body in the first embodiment. It is sectional drawing in the BB line of FIG. It is an enlarged view of the C section of FIG. It is a vertical sectional view of the lamp body in the modification of the first embodiment. It is a perspective view of the illuminating device in 2nd embodiment. It is a front view of the illuminating device in 2nd embodiment. It is sectional drawing in the DD line | wire of FIG. It is sectional drawing of the illuminating device in the modification of 2nd embodiment. It is sectional drawing of the conventional illuminating device.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[First embodiment]
FIG. 1 is a perspective view of a lighting device 1 according to a first embodiment of the present invention.
As shown in this figure, the illuminating device 1 is used for a street lamp or the like, and is arranged at a high place to illuminate the lower part of the periphery over a predetermined range. The lighting device 1 is provided with a lamp body 10 for irradiating light.

2 is a vertical sectional view of the lamp body 10, FIG. 3 is a sectional view taken along line BB in FIG. 2, and FIG. 4 is an enlarged view of a portion C in FIG.
As shown in FIGS. 2 and 3, the lamp body 10 includes a support member 11, a plurality of LEDs (light emitting diodes) 12,..., A plurality of inner lenses 13,.

The support member 11 is an octagonal cylindrical member erected along the vertical direction, and a substrate 15 is attached to each outer surface thereof.
The LEDs 12,... Are mounted on each substrate 15 in a state of being arranged in parallel at substantially equal intervals along the vertical direction. Each LED 12 is arranged such that the optical axis Ax is orthogonal to the substrate 15 and faces the outside of the lamp body 10 in a horizontal plane (a plane orthogonal to the vertical direction), and is substantially radially centered on the optical axis Ax. To emit light.

  The inner lenses 13,... Are arranged in front of the LEDs 12,..., In the direction along the optical axis Ax with respect to the LEDs 12,. Each inner lens 13 is formed in a uniform shape along a horizontal direction (direction perpendicular to the vertical direction) perpendicular to the optical axis Ax, that is, the shape in each cross section perpendicular to the horizontal direction is one. It has become. Each inner lens 13 is formed symmetrically with respect to a horizontal plane including the optical axis Ax.

As shown in FIG. 4, a concave portion 13 a that opens to the LED 12 side is formed in a portion of the inner lens 13 that faces the LED 12.
A convex (aspherical) first incident surface 131 that bulges toward the LED 12 is provided at a position facing the LED 12 at the bottom of the recess 13a. The LED 12 is located at the focal point of the first incident surface 131. Of the light emitted from the LED 12, the central portion around the optical axis Ax is refracted along the optical axis Ax to provide the optical axis Ax. The light is incident into the inner lens 13 while being parallel light in the direction.
The upper and lower inner surfaces of the concave portion 13a are second incident surfaces 132. The second incident surface 132 is a surface erected from the upper and lower end portions of the first incident surface 131 toward the LED 12 so as to cover the front of the LED 12, and from the first incident surface 131 of the light emitted from the LED 12. Also, the one that goes to the upper and lower sides is made incident into the inner lens 13.
The upper and lower outer surfaces of the inner lens 13 are internal reflection surfaces 133. The internal reflection surface 133 is a curved surface formed so as to spread outward (side away from the optical axis Ax) from the tip of the second incident surface 132 (opening end of the recess 13a) toward the optical axis Ax. The light that has entered the inner lens 13 from the second incident surface 132 is internally reflected along the optical axis Ax direction to be parallel light in the optical axis Ax direction.
The front surface of the inner lens 13 (surface opposite to the LED 12) is an emission surface 134 that is substantially orthogonal to the optical axis Ax. The exit surface 134 emits light traveling in the inner lens 13 in the optical axis Ax direction from the first incident surface 131 and the internal reflection surface 133 as it is in the optical axis Ax direction.

The outer lens 14 is formed in a cylindrical shape and covers the outer side of all the inner lenses 13 (see FIGS. 2 and 3). On the outer peripheral surface of the outer lens 14, five lens cuts 140,... Are formed in a portion located in front of each inner lens 13.
These five lens cuts 140,... Are composed of two first lens cuts 141 and three second lens cuts 142 respectively formed in a uniform cross-sectional shape over the entire circumference along the circumferential direction of the outer lens 14. Specifically, the first lens cut 141 and the second lens cut 142 are first lens cut 141, second lens cut 142, first lens cut 141, first lens cut 142 from the upper side to the lower side. The two lens cut 142 and the second lens cut 142 are arranged in the vertical direction in this order.

Among these, the 1st lens cut 141 is formed in the shape where the 1st lens reflective surface 141a which makes an upper surface, and the 1st lens output surface 141b which makes a lower surface were continued at the front-end | tip.
The first lens reflecting surface 141a is a surface that is inclined downward at an angle larger than a critical angle with respect to a surface orthogonal to the optical axis Ax, and is incident on the optical axis Ax direction incident from the inner peripheral surface of the outer lens 14. Internal reflection (total reflection) of light downward. In addition, this 1st lens reflective surface 141a may bend the middle part from a base end to a front-end | tip at convex shape upwards.
The first lens exit surface 141b is a surface that is substantially orthogonal to the vertical direction, and emits the light internally reflected by the first lens reflecting surface 141a from the outer lens 14.

The second lens cut 142 is formed in a shape in which a second lens refracting surface 142a and a second lens reflecting surface 142b forming the upper surface and a second lens emitting surface 142c forming the lower surface are connected at the tip.
The second lens refracting surface 142a and the second lens reflecting surface 142b are connected in this order from the base end to the tip end of the second lens cut 142. Among these, the second lens refracting surface 142a is a surface that is inclined downward with an angle smaller than the critical angle with respect to a surface orthogonal to the optical axis Ax, and is an optical axis incident from the inner peripheral surface of the outer lens 14. The light in the Ax direction is emitted from the outer lens 14 while being refracted downward. On the other hand, the second lens reflecting surface 142b is a surface that is inclined downward at an angle larger than the critical angle with respect to a surface orthogonal to the optical axis Ax, and is incident in the direction of the optical axis Ax incident from the inner peripheral surface of the outer lens 14 The light is internally reflected (total reflection) downward.
The second lens exit surface 142c is a surface that is substantially orthogonal to the vertical direction, and emits the light internally reflected by the second lens reflection surface 142b from within the outer lens 14.
In addition, the second lens cut 142 is lower than the first lens cut 141 so as not to block light emitted downward from the first lens cut 141 disposed above the second lens cut 142 ( Small in the direction of the optical axis Ax).

  In the illuminating device 1 having the above configuration, the inner lens 13 while the light emitted from the LED 12 at the center around the optical axis Ax is converted into parallel light in the optical axis Ax direction through the first incident surface 131. Incident in. Of the light emitted from the LED 12, the light that travels in the vertical direction from the first incident surface 131 enters the inner lens 13 while being refracted through the second incident surface 132, and then is reflected by the internal reflecting surface 133. Internally reflected in the direction of the axis Ax. Thus, substantially all of the light emitted from the LED 12 is converted into parallel light in the direction of the optical axis Ax. The parallel light is emitted from the inner lens 13 in the direction of the optical axis Ax through the emission surface 134.

The parallel light emitted from the inner lens 13 in the direction of the optical axis Ax enters the outer lens 14 from the inner peripheral surface of the outer lens 14, and is then deflected downward from the optical axis Ax by the lens cuts 140,. While exiting from the outer lens 14.
Specifically, the light emitted through internal reflection at the first lens reflecting surface 141a of the first lens cut 141 or the second lens reflecting surface 142b of the second lens cut 142 has a relatively large deflection angle. The light is deflected and irradiated near the lighting device 1. In addition, the light emitted through refraction at the second lens refracting surface 142 a of the second lens cut 142 is deflected with a relatively small deflection angle and is irradiated far away from the illumination device 1.

  As described above, according to the illuminating device 1, the inner lens 13 that is arranged in the optical axis Ax direction of the LED 12 and converts the light emitted from the LED 12 into parallel light in the optical axis Ax direction, and the light of the inner lens 13 Since the outer lens 14 having the lens cuts 140,... Arranged in the direction of the axis Ax and deflecting the light that has been converted into parallel light by the inner lens 13 is provided, a light distribution control element that converts the light from the LED 12 into parallel light ( The first incident surface 131, the second incident surface 132, and the internal reflection surface 133) and the light distribution control elements (lens cuts 140,...) That deflect the parallel light can be individually processed and molded. Therefore, compared with the conventional case in which these two light distribution control elements are integrally formed, the two light distribution control elements can be easily processed and molded, thereby realizing highly accurate light distribution control. Can do.

  Further, compared to the case where a conventional outer lens is provided in the conventional illumination device in which the two light distribution control elements are integrally formed as lenses, the light distribution control elements (lens cuts 140,...) That deflect parallel light are provided. ) On the outer lens 14, the illumination device 1 (lamp body 10) can be made compact by the amount corresponding to the light distribution control element.

[Modification of First Embodiment]
Then, the modification of said 1st embodiment is demonstrated. In addition, the same code | symbol is attached | subjected to the component similar to said 1st embodiment, and the description is abbreviate | omitted.

FIG. 5 is a vertical cross-sectional view of a lamp body 10A included in the lighting device 1A according to this modification.
As shown in the figure, the lamp body 10A provided in the lighting device 1A includes a plurality of reflectors 16 in place of the plurality of inner lenses 13 in the first embodiment.

Each reflector 16 is formed in a shape in which a plurality of reflecting portions 160,... Arranged in front of the plurality of LEDs 12,.
The reflector 160 is formed in a uniform shape along a horizontal direction (direction perpendicular to the vertical direction) orthogonal to the optical axis Ax, and is symmetric about a horizontal plane (surface orthogonal to the vertical direction) including the optical axis Ax. It is formed into a shape. Specifically, the reflecting portion 160 is formed in a curved plate shape that opens in the direction of the optical axis Ax, and the LED 12 faces the opening from the hole portion formed in the base end portion. The inner surface of the reflecting portion 160 is a parabolic surface having the optical axis Ax as a central axis, and is a reflecting surface 160a in which the LED 12 is disposed at the focal point, and the light emitted from the LED 12 is emitted as light. Reflected so as to be parallel light in the direction of the axis Ax.

  Even with the above lighting device 1A, the same effects as those of the lighting device 1 in the first embodiment can be obtained. That is, the light distribution control element (reflecting surface 160a) that converts the light from the LED 12 into parallel light and the light distribution control element (lens cut 140,...) That deflects the parallel light can be individually processed and molded. Therefore, compared to the conventional case in which these two light distribution control elements are integrally formed, the two light distribution control elements can be easily processed and molded, and thus realize high-precision light distribution control. Can do.

[Second Embodiment]
Next, a second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the component similar to said 1st embodiment, and the description is abbreviate | omitted.

6 is a perspective view of the lighting device 2 according to the second embodiment of the present invention, FIG. 7 is a front view of the lighting device 2, and FIG. 8 is a cross-sectional view taken along the line DD of FIG. It is.
As shown in these drawings, the illuminating device 2 is used for a stadium illumination lamp or the like, and is arranged at a high place to illuminate the lower front part over a predetermined range.

The lighting device 2 includes a flat support member 21. On the front surface of the support member 21, a plurality of LEDs 12,... Mounted on the substrate 15 are arranged in a plurality of rows and a plurality of stages.
An inner lens 23 is disposed in front of the LEDs 12,. The inner lens 23 is the same as the inner lens 13 in the first embodiment except that the inner lens 23 is formed to be elongated in the left-right direction so as to extend in front of all the LEDs 12,. Is formed.

  A substantially flat outer lens 24 is arranged in front of the inner lenses 23. The outer lens 24 is fitted to the support member 21 at the periphery while covering the front of all the inner lenses 23. Of the front surface of the outer lens 24, five lens cuts 240,... Are formed in a portion located in front of each inner lens 23. The lens cuts 240 are formed in the same manner as the lens cuts 140 in the first embodiment except that the lens cuts 240 are formed so as to extend in the left-right direction.

  Also with the above illuminating device 2, the effect similar to the illuminating device 1 in said 1st embodiment can be show | played.

  The embodiments to which the present invention can be applied are not limited to the first embodiment, the modified example, and the second embodiment described above, and can be appropriately changed without departing from the spirit of the present invention. is there.

  For example, in the first embodiment and the modified example thereof, and in the second embodiment, the inner lenses 13 and 23 and the reflection portion 160 (reflection surface 160a) are uniform along a horizontal direction orthogonal to the optical axis Ax. In other words, the shape of each cross section orthogonal to the horizontal direction is uniform, but the inner lenses 13 and 23 and the reflecting portion 160 (reflecting surface 160a) It is good also as an axially symmetrical shape which makes optical axis Ax a symmetric axis. However, in this case, it is needless to say that the inner lens 23 needs to correspond to each LED 12.

  Further, the plurality of inner lenses 13 and 23 may be integrally formed by connecting the adjacent inner lenses 13 and 23 at their ends. If constituted in this way, arrangement work of the inner lenses 13 and 23 can be simplified.

  In the first embodiment, the outer lens 14 does not have to be formed in a cylindrical shape, and is formed in an octagonal cylinder shape having an inner peripheral surface and an outer peripheral surface parallel to the respective emission surfaces 134 of the inner lenses 13. It may be.

  Moreover, in 2nd embodiment, as shown in FIG. 9, the illuminating device 2 is replaced with the reflectors 16 ... instead of the inner lens 23 ... like the illuminating device 1A in the modification of 1st embodiment. May be provided.

1, 1A Lighting device 10, 10A Lamp 11 Support member 12 LED
Ax Optical axis 13 Inner lens (optical system)
131 First incident surface 132 Second incident surface 133 Internal reflection surface 134 Outgoing surface 14 Outer lens (lens)
140 lens cut 141 first lens cut 141a first lens reflecting surface 141b first lens emitting surface 142 second lens cut 142a second lens refracting surface 142b second lens reflecting surface 142c second lens emitting surface 16 reflector 160 reflecting portion 160a reflecting Surface (optical system)
2 Illuminating device 21 Support member 23 Inner lens (optical system)
24 Outer lens (lens)
240 Lens cut

Claims (3)

LEDs that emit light substantially radially around the optical axis;
An optical system that is arranged in front of the LED, and converts the light emitted from the LED into parallel light in the optical axis direction along the optical axis;
A lens having a lens cut that is disposed in front of the optical system and deflects the light that has been converted into parallel light by the optical system;
A lighting device comprising: The optical system is an inner lens,
The inner lens is
A first incident surface that is provided at a position facing the LED and that enters the inner lens while refracting light emitted from the LED in the optical axis direction;
A second incident surface that is erected from the end of the first incident surface to the LED side, and that emits light emitted from the LED and directed laterally from the first incident surface into the inner lens;
An internal reflection surface that is formed so as to spread outward from the tip of the second incident surface toward the optical axis direction, and internally reflects light incident from the second incident surface into the inner lens in the optical axis direction; ,
The lighting device according to claim 1, wherein:   The illumination device according to claim 1, wherein the optical system is a parabolic surface having the optical axis as a central axis, and is a reflecting surface on which the LED is arranged at a focal point.

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