JP2013037920A - Lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device capable of efficiently deflecting light emitted from LEDs as compared with a conventional one.SOLUTION: The lighting device 1 is provided with inner lenses 13 arranged in front of LEDs 12 and an outer lens 14 arranged in front of the inner lenses 13 and the light from the LEDs 12 is deflected to the lower side. The inner lens 13 includes a first lens part 131 for deflecting the light around an optical axis Ax1 out of the light from the LED 13 to an advancing direction almost along a deflection direction, a second lens part 132 for deflecting the light advancing to the lower side than the first lens part 131 out of the light from the LED 12 to the advancing direction almost along the deflection direction, and a third lens part 133 for deflecting the light upward than the first lens part 131 out of the light from the LED 12 to the advancing direction almost along the deflection direction. The outer lens 14 includes lens cuts 140, ... which even light-advancing directions of the light from the firs lens part 131 to the third lens part 133.

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. 9, the lighting 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 illuminating device described in Patent Document 1, since all the light is once converted into parallel light even though the outgoing light is finally deflected, it is emitted from the LED 81 at an outgoing angle close to the deflection angle of the outgoing light. Almost useless light distribution control is performed on the emitted light, and the light distribution control is inefficient as a whole.

  This invention is made | formed in view of the said situation, and makes it a subject to provide the illuminating device which can deflect the light radiate | emitted from LED efficiently compared with the past.

In order to solve the above-mentioned problem, the invention described in claim 1
In an illumination device that deflects light emitted from an LED in a predetermined deflection direction,
An inner lens disposed in front of the LED;
An outer lens disposed in front of the inner lens;
With
The inner lens is
A first lens portion provided at a position facing the LED and deflecting light emitted from the LED around the optical axis in a traveling direction substantially along the deflection direction;
Provided on the deflection direction side of the first lens portion, and deflects light emitted from the LED toward the deflection direction side of the first lens portion in a traveling direction substantially along the deflection direction. A second lens part;
A traveling direction that is provided on the opposite side to the deflection direction side of the first lens portion, and that substantially goes along the deflection direction in the light emitted from the LED and that travels toward the opposite side from the first lens portion. A third lens part deflected to
Have
The outer lens has a lens cut that refracts the light so that the traveling directions of the light from the first lens portion, the second lens portion, and the third lens portion are uniform.

Invention of Claim 2 is the illuminating device of Claim 1,
The first lens part is
A first incident surface that causes light around the optical axis out of the light emitted from the LED to enter the first lens unit while being parallel light along the optical axis;
A first internal reflection surface that internally reflects light incident from the first incident surface so as to substantially follow the deflection direction;
A first emission surface for emitting light internally reflected by the first internal reflection surface from within the first lens portion;
Have
The second lens part is
Of the light emitted from the LED, the light emitted toward the deflection direction side from the first lens portion is incident on the second lens portion while being converted into parallel light along a predetermined direction toward the deflection direction side. A second incident surface;
A second exit surface for exiting from the second lens portion while slightly refracting light incident from the second entrance surface;
Have
The third lens part is
A third light that is emitted from the LED and emitted to the opposite side of the first lens unit is incident on the third lens unit as parallel light along a predetermined direction toward the opposite side. An incident surface;
A third internal reflection surface that internally reflects light incident from the second incident surface toward the deflection direction;
A third emission surface that radiates the light internally reflected by the third internal reflection surface and emits the light from the third lens unit; and
It is characterized by having.

  According to the present invention, since the light emitted from the LED at different emission angles is individually deflected by the first lens unit to the third lens unit of the inner lens, in the first lens unit to the third lens unit, the LED It is sufficient that the light is individually deflected by a necessary amount in accordance with each incident angle of light from the LED, particularly in the second lens portion where the incident angle of light from the LED is close to a desired deflection angle. The light is emitted without being deflected. Therefore, the light emitted from the LED can be efficiently deflected as compared with the conventional case where all the light from the LED is converted into parallel light and then the light is deflected.

  At this time, since the outer lens is cut, the light is refracted so as to equalize the traveling direction of the light from the first lens part to the third lens part. Even if there is a deviation between the traveling directions of the light, the traveling direction is leveled and uniform light along the desired deflection direction can be obtained as a whole.

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 figure for demonstrating the deflection | deviation aspect of the light in the lamp body in 1st 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 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 cross-sectional view of the lamp body 10, FIG. 3 is a cross-sectional view taken along line BB in FIG. 2, FIG. 4 is an enlarged view of a portion C in FIG. FIG. 6 is a diagram for explaining a light deflection mode in the lamp body 10.
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 Ax1 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 Ax1. To emit light.

  The inner lenses 13,... Are arranged in front of the LEDs 12,..., In a direction along the optical axis Ax1 (hereinafter referred to as the optical axis Ax1 direction) 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) orthogonal to the optical axis Ax1, that is, the shape in each cross section orthogonal to the horizontal direction is one. It has become.

  As shown in FIGS. 4 and 5, the inner lens 13 includes a first lens part 131 provided at a position facing the LED 12, a second lens part 132 provided below the first lens part 131, and And a third lens part 133 provided on the upper side of the first lens part 131.

Among these, the first lens unit 131 deflects the light emitted from the LED 12 around the optical axis Ax1.
The first lens portion 131 is provided with a convex (aspheric) first incident surface 131 a bulging toward the LED 12 at a position facing the LED 12. The first incident surface 131a has the LED 12 located at the focal point thereof, and the emission angle of the ultraviolet rays from the LED 12 to the outer peripheral edge of the first incident surface 131a (the angle in the emission direction from the optical axis Ax1) is 20 °. It is formed as follows. With such a configuration, the first incident surface 131a causes the light emitted from the LED 12 to refract light around the optical axis Ax1 having an emission angle of less than 20 ° so as to follow the optical axis Ax1. The light is incident on the first lens portion 131 (inner lens 13) while being parallel light in the direction.
An apex portion protruding in the direction of the optical axis Ax1 is formed at the front portion (the portion opposite to the LED 12) of the first lens portion 131, and the surface above the apex portion is the first reflecting surface 131b. The lower surface constitutes the first emission surface 131c.
The first reflecting surface 131b is a surface that is inclined downward at an angle larger than the critical angle with respect to the surface orthogonal to the optical axis Ax1, and the light traveling in the direction of the optical axis Ax1 from the first incident surface 131a is directed downward. Internal reflection (total reflection).
The first emission surface 131c is a surface substantially orthogonal to the vertical direction, and emits the light internally reflected by the first reflection surface 131b from the first lens portion 131 (inner lens 13). The traveling direction of the light emitted from the first emission surface 131 c is substantially along the deflection direction in which the light is finally emitted out of the apparatus through the outer lens 14.

The second lens unit 132 deflects light emitted from the LED 12 toward the lower side than the first incident surface 131a (first lens unit 131).
In the second lens portion 132, a convex (aspheric) second incident surface 132a bulging obliquely upward toward the LED 12 is connected to the lower end of the first incident surface 131a. The second incident surface 132a is formed symmetrically about the second central axis Ax2 obtained by rotating the optical axis Ax1 downward by 40 ° around the LED 12, and the LED 12 is located at the focal point. With such a configuration, the second incident surface 132a refracts light emitted from the LED 12 to the lower side at an emission angle of 20 ° or more along the second central axis Ax2. The light is incident on the second lens portion 132 (inner lens 13) while being parallel light in a direction along the second central axis Ax2 (hereinafter referred to as a second central axis Ax2 direction).
A second exit surface 132 b is formed on the front surface of the second lens portion 132. The second emission surface 132b is a surface inclined in the optical axis Ax1 direction toward the upper side, and slightly refracts the light traveling from the second incident surface 132a in the second central axis Ax2 direction to the lower side. The light is emitted from the second lens portion 132 (inner lens 13). The traveling direction of the light emitted from the second emission surface 132b is substantially along the deflection direction in which the light is finally emitted outside the apparatus through the outer lens 14.

The third lens unit 133 deflects the light emitted from the LED 12 toward the upper side of the first incident surface 131a (first lens unit 131).
In the third lens portion 133, a convex (aspheric) third incident surface 133a bulging obliquely downward toward the LED 12 is connected to the upper end of the first incident surface 131a. The third incident surface 133a is formed symmetrically with respect to the third central axis Ax3 obtained by rotating the optical axis Ax1 upward by 40 ° around the LED 12, and the LED 12 is located at the focal point. With such a configuration, the third incident surface 133a refracts light emitted from the LED 12 to the upper side at an emission angle of 20 ° or more along the third central axis Ax3. The light is incident on the third lens portion 133 (inner lens 13) while being parallel light in a direction along the third central axis Ax3 (hereinafter referred to as a third central axis Ax3 direction).
The upper end surface of the third lens portion 133 is a third reflecting surface 133b. The third reflecting surface 133b is inclined slightly upward in the direction of the optical axis Ax1, and the light traveling from the second incident surface 132a in the direction of the third central axis Ax3 is internally reflected downward (total reflection). )
The front surface of the third lens portion 133 is a third emission surface 133c. The third emission surface 133c is a surface slightly inclined downward in the direction of the optical axis Ax1, and the third lens portion 133 is refracted by the light internally reflected by the third reflection surface 133b. The light is emitted from inside (inner lens 13). The traveling direction of the light emitted from the third emission surface 133c is substantially along the deflection direction in which the light is finally emitted out of the apparatus through the outer lens 14.

  As shown in FIGS. 2 and 5, the outer lens 14 is formed in a substantially cylindrical shape and covers the outer sides of all the inner lenses 13. On the outer peripheral surface of the outer lens 14, a plurality of lens cuts 140 are formed over the entire surface. These lens cuts 140,... Extend along the entire circumferential direction of the outer lens 14, are each formed into a gentle wavy uniform vertical cross-sectional shape, and are arranged in parallel in the vertical direction. The lens cuts 140,... Refract the light so that the traveling directions of the light emitted from the first lens unit 131, the second lens unit 132, and the third lens unit 133 are leveled.

  In the illuminating device 1 having the above-described configuration, among the light emitted from the LED 12, light around the optical axis Ax1 having an emission angle of less than 20 ° is converted into parallel light in the direction of the optical axis Ax1 through the first incident surface 131a. Then, the light enters the first lens portion 131 of the inner lens 13. The light is internally reflected downward by the first reflecting surface 131b and then emitted from the first emitting surface 131c to the outside of the first lens portion 131 (inner lens 13).

  Of the light emitted from the LED 12, the light traveling downward from the first incident surface 131 a is converted into parallel light in the second central axis Ax2 direction through the second incident surface 132 a, and the second of the inner lens 13. The light enters the lens unit 132. This light is emitted out of the second lens part 132 (inner lens 13) while being slightly refracted through the second emission surface 132b.

  In addition, among the light emitted from the LED 12, light that goes upward from the first incident surface 131 a is converted into parallel light in the direction of the third central axis Ax3 through the third incident surface 133 a, and the third lens of the inner lens 13. Incident into the portion 133. This light is internally reflected downward by the third reflecting surface 133b, and is then refracted through the third emitting surface 133c and emitted outside the third lens portion 133 (inner lens 13).

  When these lights emitted from the first lens part 131, the second lens part 132, and the third lens part 133 are transmitted through the outer lens 14, their traveling directions are leveled by the lens cuts 140,. The light is uniformly irradiated around the periphery of the apparatus 1.

  At this time, the light emitted from the first lens unit 131 is deflected at a relatively large deflection angle (an angle from the optical axis Ax1) and irradiated to the vicinity of the illumination device 1, and is emitted from the third lens unit 133. The emitted light is deflected with a relatively small deflection angle and irradiated far away from the illumination device 1, and the light emitted from the second lens unit 132 is irradiated onto these intermediate regions.

  Thus, in the illuminating device 1, the light emitted from the LEDs 12,... Is deflected through the inner lens 13 and the outer lens 14 over a predetermined range of deflection directions below the optical axis Ax1, and the illuminating device. 1 is uniformly irradiated around the periphery of 1.

  As described above, according to the illuminating device 1, the light emitted from the LED 12 at different emission angles is individually deflected by the first lens unit 131 to the third lens unit 133 of the inner lens 13. In the part 131 to the third lens part 133, it is only necessary to individually deflect the light by a necessary amount according to each incident angle of the light from the LED 12, and in particular, the incident angle of the light from the LED 12 becomes a desired deflection angle. The near second lens part 132 emits the light with almost no deflection. Therefore, the light emitted from the LED 12 can be efficiently deflected as compared with the conventional case where all the light from the LED is converted into parallel light and then the light is deflected.

  Further, at this time, the light is refracted by the lens cuts 140 of the outer lens 14 so that the traveling directions of the light from the first lens portion 131 to the third lens portion 133 are uniform, so the first lens portion 131 is refracted. Even when there is a deviation between the traveling directions of the light from the third lens portion 133, the traveling directions are leveled and uniform light along the desired deflection direction can be obtained as a whole. .

[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. A plurality of lens cuts 240 are formed on the front surface of the outer lens 24. 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 and second embodiments described above, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the first and second embodiments, the plurality of inner lenses 13 and 23 may be integrally configured by being connected to adjacent ones at the 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 substantially cylindrical shape, and is formed in an octagonal cylinder shape having an inner peripheral surface and an outer peripheral surface parallel to each outer surface of the support member 11. Also good.

DESCRIPTION OF SYMBOLS 1 Illuminating device 10 Lamp body 11 Support member 12 LED
Ax1 Optical axis 13 Inner lens 131 First lens portion 131a First entrance surface 131b First reflection surface 131c First exit surface 132 Second lens portion 132a Second entrance surface Ax2 Second central axis 132b Second exit surface 133 Third lens Part 133a Third entrance surface Ax3 Third central axis 133b Third reflection surface 133c Third exit surface 14 Outer lens 140 Lens cut 2 Illumination device 21 Support member 23 Inner lens 24 Outer lens 240 Lens cut

Claims (2)

In an illumination device that deflects light emitted from an LED in a predetermined deflection direction,
An inner lens disposed in front of the LED;
An outer lens disposed in front of the inner lens;
With
The inner lens is
A first lens portion provided at a position facing the LED and deflecting light emitted from the LED around the optical axis in a traveling direction substantially along the deflection direction;
Provided on the deflection direction side of the first lens portion, and deflects light emitted from the LED toward the deflection direction side of the first lens portion in a traveling direction substantially along the deflection direction. A second lens part;
A traveling direction that is provided on the opposite side to the deflection direction side of the first lens portion, and that substantially goes along the deflection direction in the light emitted from the LED and that travels toward the opposite side from the first lens portion. A third lens part deflected to
Have
The illuminating device, wherein the outer lens has a lens cut that refracts the light so that the traveling directions of the light from the first lens portion, the second lens portion, and the third lens portion are uniform. The first lens part is
A first incident surface that causes light around the optical axis out of the light emitted from the LED to enter the first lens unit while being parallel light along the optical axis;
A first internal reflection surface that internally reflects light incident from the first incident surface so as to substantially follow the deflection direction;
A first emission surface for emitting light internally reflected by the first internal reflection surface from within the first lens portion;
Have
The second lens part is
Of the light emitted from the LED, the light emitted toward the deflection direction side from the first lens portion is incident on the second lens portion while being converted into parallel light along a predetermined direction toward the deflection direction side. A second incident surface;
A second exit surface for exiting from the second lens portion while slightly refracting light incident from the second entrance surface;
Have
The third lens part is
A third light that is emitted from the LED and emitted to the opposite side of the first lens unit is incident on the third lens unit as parallel light along a predetermined direction toward the opposite side. An incident surface;
A third internal reflection surface that internally reflects light incident from the second incident surface toward the deflection direction;
A third emission surface that radiates the light internally reflected by the third internal reflection surface and emits the light from the third lens unit; and
The lighting device according to claim 1, wherein:

Images