JP3787148B1 - Lighting unit and lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain an illumination unit and an illumination device which collects LED light with high efficiency and does not cause color unevenness and shadow in an irradiation area.
SOLUTION: A first reflecting portion 25 having a parabolic surface 25a and a second reflecting portion 27 having a flat reflecting surface 27a on the light emitting side of the first reflecting portion 25 are further provided. When the boundary line between the light beam and its shadow on the surface of the second reflecting portion is the first boundary line, and the boundary line between the light beam from another adjacent light emitting diode 17 and its shadow is the second boundary line The height of the second reflecting portion 27 protruding to the light emitting side is set to be higher than the point on the surface of the second reflecting portion where the first boundary line and the second boundary line first have tolerances.
[Selection] Figure 7

Description

  The present invention relates to an illumination unit using an LED as a light source and an illumination device including the illumination unit.

  As a conventional lighting fixture, various types of illumination light sources such as fluorescent lamps, incandescent bulbs, spotlights, etc. are used, but the illumination light contains ultraviolet components that induce deterioration of the irradiated object, Due to the heat generated by the illumination light source, there were many restrictions on its installation. Recently, LED light sources with low heat generation and low power consumption have attracted attention, and since white LEDs with high brightness have been provided, those using LED light sources for general lighting fixtures are increasing. . An example of this type of lighting device is disclosed in Patent Document 1, for example.

  However, the irradiation light distribution of the direct light obtained from the LED becomes broad as the irradiation distance becomes long even if the directivity is high, and the irradiation region becomes too wide and the illuminance becomes insufficient. FIG. 27 (a) shows the illuminance distribution on the surface separated by a predetermined distance when the LED 81 emits light alone without providing a reflector. As shown in the figure, when the LED 81 is caused to emit light alone on a surface separated by a predetermined distance, a broad light amount distribution is obtained with low illuminance. For this reason, many configurations have been proposed in which a reflector is provided on the LED light source, but all reflectors simply return light directed to the side or rear of the LED light source to the front, and are not necessarily highly condensing. In addition, the irradiation light distribution was broad, and it was supposed to illuminate unnecessary areas. Under such circumstances, it is generally performed to use a high-intensity light source to obtain necessary and sufficient illuminance, and to cut the unnecessary light with a light shielding material such as a louver to limit the irradiation area. .

  However, since the high-intensity light source has high power consumption and a large size, there are many restrictions on the installation of the lighting device and the application range is limited. Furthermore, light shielding materials such as louvers cause a decrease in light utilization efficiency, and many problems remain.

  In general, as a light source for illumination, a light source capable of obtaining an illumination region having a high illuminance and a flat illuminance distribution is required. Therefore, as shown in FIG. 27B, by providing a reflecting plate 83 having a concave paraboloid on the side (or the back side or the like) of the LED 81, the light from the LED 81 is transmitted by the reflecting plate 83. The light beam density can be increased by parallel light. In addition, the reflection plate 83 can extend the reach of light to some extent. However, although the light component 85 emitted to the side of the LED 81 is deflected by the reflecting plate 83, the light component 86 that has not been irradiated to the reflecting plate 83 travels forward in the optical path while diffusing. For this reason, the illuminance distribution of the entire light source can be increased by the reflector 83, but it still exhibits a broad distribution, and a high illuminance and flat illuminance distribution illumination area necessary for illumination cannot be obtained sufficiently. . Of course, when the LED 81 has a small illuminance angle of about 10 °, the reflection plate 83 is not irradiated with the light emitted from the LED 81, and there are many components that do not substantially contribute to deflection, and the illuminance is improved. I can't hope.

  Accordingly, the inventors of the present application have developed a lighting device including a novel reflector that can collect light from an LED with high efficiency without increasing the output of the LED and obtain high illuminance (Japanese Patent Application No. 2004-2004). 346543). According to the reflecting plate of this illuminating device, it is possible to irradiate light from the LED in a specific range, and it is possible to illuminate with high illuminance within the irradiation range. In addition, the boundary between the irradiated region and the non-irradiated region is clearly separated, and it is possible to selectively remove the region that is not desired to be irradiated.

JP 2000-021209 A

By the way, as shown in FIG. 28, in the lighting device provided with the above-described novel reflector, the first reflecting portion 83a reflects the light from the light emitting diode 81 in a substantially parallel manner toward the light emitting side, and the second By reflecting the light from the light emitting diode 81 that has not entered the first reflecting portion 83a so as to be substantially parallel and reflected toward the light emitting side, the illuminance distribution can be made uniform with high illuminance.
However, a boundary line 87 between the light beam from the light emitting diode 81 emitted from the first reflecting portion 83a and its shadow appears on the surface of the second reflecting portion 83b. This boundary line 87 also appears in the same manner due to the light flux from another adjacent light emitting diode 81 and its shadow. A region sandwiched between the boundary lines 87 forms a substantially triangular shadow (region portion with little irradiation light from the reflection portion) 89 with the tolerance point 88 as an apex angle. When the shadow 89 falls on the light exit side beyond the second reflecting portion 83b (propagating), color unevenness S1 and shadow S2 of the illumination light are generated on the irradiated object, and as a result, high quality uniform illumination is achieved. It became a hindrance.
The present invention has been made in view of the above-described situation, and is capable of condensing LED light with high efficiency and uniform without causing color unevenness and shadows even in the case of illumination in close proximity. It aims at providing the illumination unit and illuminating device which can obtain illumination light.

The above object of the present invention is achieved by the following configuration.
(1) An illumination unit using light emitting diodes as a light source, the light emitting unit having a plurality of light emitting diodes arranged on a base, and the light emitting side of the light emitting unit provided corresponding to each of the plurality of light emitting diodes The light-emitting surface of the light-emitting diode is a first reflecting part having a paraboloidal surface that is a focal position, and the light from the light-emitting diode is reflected toward the light-emitting side further toward the light-emitting side of the first reflecting part. A second reflection part having a flat reflection surface, and a boundary line between the light beam emitted from the first reflection part and the shadow emitted from the first reflection part on the surface of the second reflection part is defined as a first boundary. When the boundary line between the light beam from another light emitting diode adjacent to the light emitting diode on the surface of the second reflecting part and its shadow is the second boundary line, the light emission of the second reflecting part High protruding side Is set higher than a point on the surface of the second reflecting portion where the first boundary line and the second boundary line first have a tolerance.

  According to this illumination unit, the height of the second reflecting portion is such that the first boundary line between the light beam emitted from the first reflecting portion on the surface of the second reflecting portion and its shadow, and the adjacent surface on the surface of the second reflecting portion. By setting the light beam from the other light emitting diode higher than the first tolerance point of the second boundary line between the light beam and the shadow, the shadow generated without irradiating the second reflection part is generated in the second reflection part. Over the surface of the second reflecting portion without being dropped (propagated) to the light exit side. Therefore, the color unevenness and shadow of the illumination light that are generated when the shadow is emitted together with the light flux are not generated.

(2) The illumination unit according to (1), wherein a pair of the second reflecting portions are arranged in parallel to the arrangement direction of the light emitting diodes with the light emitting diodes interposed therebetween.

  According to this illumination unit, the light incident directly from the light emitting diode to the second reflecting portion is condensed on both reflecting surfaces of the second reflecting portion arranged in parallel to the direction in which the light emitting diodes are arranged. Is increased.

(3) The plurality of light emitting diodes are arranged in a plurality of rows, and the second reflecting portion is parallel to the arrangement direction of the light emitting diodes in the light emitting diode rows on both outer sides of the plurality of light emitting diode rows. The illumination unit according to (1), wherein a pair of the illumination units is arranged.

  According to this illumination unit, the light directly incident on the second reflecting portion from the light emitting diode is condensed on both reflecting surfaces of the pair of second reflecting portions, and the illuminance is increased.

(4) The light-emitting diode array has a staggered arrangement in which the arrangement pitch of the first reflecting portions in the light-emitting diode array is shifted by 1/2 pitch between adjacent light-emitting diode arrays. The lighting unit according to (3).

  According to this illumination unit, the first reflecting portions are arranged in a staggered manner between adjacent light emitting diode rows, so that the first reflecting portions can be arranged at close positions and emitted from the first reflecting portions. The shadow that is not irradiated with the light is reduced, and the color unevenness and shadow of the illumination light due to this shadow are suppressed.

(5) The light emitting diodes between the light emitting diode rows and the other light emitting diode rows adjacent thereto have a step with respect to the light emitting direction. Or the illumination unit of (4) description.

  According to this lighting unit, a boundary line (for example, a first boundary line) that is one side portion sandwiching the apex angle due to a step between adjacent light emitting diodes (a step in a direction retracting to the opposite side of the light emitting direction) Are translated to the light emitting diode side, and the substantially triangular shadow sandwiched between the first boundary line and the second boundary line formed on the surface of the second reflecting portion is reduced. That is, the occurrence of color unevenness and shadows in the illumination light is suppressed by reducing the shadow.

(6) The illumination according to any one of (1) to (5), wherein the reflecting surfaces of the first reflecting portion and the second reflecting portion are mirror-finished coated surfaces by vapor deposition. unit.

  According to this lighting unit, the reflecting surface is finished by coating processing by vapor deposition, for example, sputtering plating. The sputtering plating process consists of the application of a base coat with a dedicated primer, aluminum deposition in a vacuum, and urethane clear coating on the aluminum deposition surface, even on complex adherend surfaces such as paraboloids of resin products. A mirror surface can be formed, and a reflective surface with high reflectivity can be formed.

(7) Any one of the items (1) to (5) is characterized in that at least one of the reflecting surfaces of the first reflecting portion and the second reflecting portion is formed in a plain shape. Lighting unit.

  According to this lighting unit, the light reflected by the plain light reflecting surface is specularly reflected when viewed macroscopically, but diffused and reflected when viewed microscopically, and as a result, dispersed. Color separated light of different frequency (wavelength) components is mixed.

(8) The light-emitting diode is a white light-emitting diode having a blue light-emitting diode and a phosphor that converts blue light from the blue light-emitting diode into yellow light (1) to (7) The lighting unit according to claim 1.

  In this lighting unit, when the blue light emitted from the blue light emitting diode is absorbed by the phosphor, the phosphor emits yellow light, and the yellow light and the blue light that has not been absorbed are mixed together to emit from the light emitting diode. The incident light becomes white light.

(9) An illumination device comprising: the illumination unit according to any one of items (1) to (8); and a drive unit that supplies electric power for driving the light emitting diode to emit light. .

  According to this lighting device, when the commercial power is supplied to the drive unit, the drive unit supplies the drive power necessary for the light emission drive to the light emitting diode, and the light emitting diode is power-saving and uniform with high illuminance. Light is emitted with a good illuminance distribution.

  According to the illumination unit of the present invention, the illumination unit includes a first reflecting part having a parabolic surface and a second reflecting part having a flat reflecting surface, and is emitted from the first reflecting part on the surface of the second reflecting part. The boundary line between the light beam from the light emitting diode and its shadow is the first boundary line, and the boundary line between the light beam from another adjacent light emitting diode on the surface of the second reflecting portion and its shadow is the second boundary line. Sometimes, the height of the second reflecting portion is set higher than a point on the surface of the second reflecting portion where the first boundary line and the second boundary line are first toleranced, so that the second reflecting portion is not irradiated. Therefore, it is possible to accommodate the shadow generated in the second reflecting portion without dropping to the light exit side beyond the second reflecting portion, and to prevent the occurrence of color unevenness and shadow of illumination light caused by the shadow being emitted together with the light flux. it can. As a result, high-quality uniform illumination can be performed.

  The lighting device according to the present invention includes the above-described lighting unit and a drive unit that supplies power for driving light emission of the light-emitting diode, so that power can be saved by supplying commercial power to the drive unit. Nevertheless, a uniform illuminance distribution can be obtained with high illuminance, and illumination light free from color unevenness and shadow can be irradiated by the independent unit.

DESCRIPTION OF EMBODIMENTS Hereinafter, preferred embodiments of a lighting unit and a lighting device according to the present invention will be described with reference to the drawings.
FIG. 1 is an overall configuration diagram showing a first embodiment of a lighting device according to the present invention.
The illuminating device 200 of 1st Embodiment which concerns on this invention has the illumination unit 100 and the drive part 11, and is comprised.
The drive unit 11 supplies light emission drive power to the illumination unit 100, and for example, a full range transformer or the like can be used. The drive unit 11 is connected to a commercial power source, and power from the commercial power source, for example, AC 110 V to 220 V, 50 Hz to 60 Hz, or the like is changed to a drive voltage of DC 12 V (any voltage such as DC 6 V or DC 24 V, or AC). The light is converted and supplied to the lighting unit 100.

  The illumination unit 100 includes a rear plate 15, a light emitting unit 21 in which a large number of light emitting diodes (LEDs) 17 are linearly disposed on a wiring board 19 as a base, and a reflecting mirror member 23. Has been. The rear plate 15 is detachably assembled to the reflecting mirror member 23 with the wiring board 19 interposed therebetween.

  The LED 17 includes a blue light emitting diode and a phosphor that converts blue light from the blue light emitting diode into yellow light. Thereby, in the LED 17, when the blue light emitted from the blue light-emitting diode is absorbed by the phosphor, the phosphor emits yellow light, and the yellow light and the blue light that has not been absorbed are mixed, and the emitted light Becomes white light.

FIG. 2 is a side view of the lighting unit (a), a bottom view (b), and FIG. 3 is an exploded perspective view of the lighting unit.
The illumination unit 100 has a height H in a state in which the rear plate 15 is assembled to the reflecting mirror member 23 as shown in FIG. The height H is about 20 mm in the present embodiment, and is significantly thinner than when a heat-generating bulb or a fluorescent lamp is used as the light source. If the height H is too small, the deflection characteristics of the reflecting mirror member 23 are impaired. If the height H is too large, an installation space is required and the degree of freedom in arrangement of the illumination unit 100 cannot be increased. Therefore, the height H is desirably about 15 to 30 mm, particularly about 20 to 23 mm.

  As shown in FIG. 2B, the reflecting mirror member 23 is connected to the mounting base 24 as shown in FIG. 2B, and has an opening at the center position. A first reflecting portion 25 having a plurality of reflecting surfaces (parabolic mirrors) 25a (16 in total in the present embodiment) formed on the light emitting side of the first reflecting portion 25. And a second reflecting portion 27 having a flat reflecting surface (flat plate mirror) 27a parallel to the direction in which the parabolic mirrors 25a are arranged. The second reflecting portion 27 is formed by a pair of plane plate mirrors 27a formed in a direction orthogonal to the direction in which the parabolic mirrors 25a are arranged, and both sides of the arranging direction are the parabolic mirrors of the first reflecting portion 25. They are connected by an extended parabolic wall 27b. The reflecting mirror member 23 is a resin molded product integrally formed by injection molding, and at least the light reflecting surfaces of the first reflecting portion 25 and the second reflecting portion 27 are coated with a mirror surface by plating or aluminum vapor deposition. Is given. Further, the light reflecting surface is not limited to this, and other conventional means can be used.

  The reflecting surfaces (parabolic mirror 25a, flat plate mirror 27a) of the first reflecting portion 25 and the second reflecting portion 27 are finished by a coating process by vapor deposition, for example, sputtering plating. The sputtering plating process consists of the application of a base coat with a dedicated primer, aluminum deposition in a vacuum, and urethane clear coating on the aluminum deposition surface, even on complex adherend surfaces such as paraboloids of resin products. A mirror surface can be formed, and a reflective surface with high reflectivity can be formed.

  As shown in FIG. 3, the rear plate 15 includes an umbrella portion 29 having a “<” shape in the longitudinal section, a rib 30 that supports the back side of the wiring board 19 on the inner side surface of the umbrella portion 29, and the umbrella portion 29. The lock claws 31 that engage with the reflecting mirror member 23 are arranged at a plurality of locations in the longitudinal direction (5 locations in the present embodiment). The lock claw 31 is formed in a hook shape in which a pair of upper and lower vertical sections in the figure has a “U” shape.

  The wiring board 19 is, for example, a printed board, and a plurality (16 in this case) of LEDs 17 are linearly mounted on the reflecting mirror member 23 side along the longitudinal direction so as to correspond to the individual parabolic mirrors 25a. Yes. And the lead wire 33 is pulled out from the one end side of the wiring board 19, and is connected to the drive part 11 (refer FIG. 1). Since the wiring board 19 is a single-sided mounting module, it is a safe module that is easy to find a problem when a failure occurs and has excellent maintainability.

  In the reflecting mirror member 23, brackets 37 for fixing the illumination unit 100 are formed at both ends of a mounting base portion 24 formed in a long flat plate shape. An engaging portion 39 with which the lock claw 31 is engaged is provided. The engaging portion 39 is detachably combined by sandwiching the wiring board 19 with the rear plate 15 and snapping with the lock claw 31 of the rear plate 15.

  When the reflecting mirror member 23, the wiring board 19, and the rear plate 15 are combined, the light emitting surface of the LED 17 is positioned at the focal position of the parabolic mirror of the first reflecting portion 25. In other words, the reflecting mirror member 23 has discretely arranged surfaces that contact the surface of the wiring board 19, and this contacting surface is a height at which the light emitting surface of the LED 17 becomes the focal position of the parabolic mirror. Is formed. Further, when the wiring board 19 is housed in the board accommodation position formed on the reflecting mirror member 23, the height of the rib 30 of the rear plate 15 is set so as to press the wiring board 19 against the contact surface. .

  Therefore, by simply combining the reflector member 23, the wiring board 19, and the rear plate 15, the focal position of the parabolic mirror and the position of the light emitting surface of the LED 17 can be easily matched with high accuracy. With this configuration, for example, it is possible to easily assemble without using fastening means such as screws, reduce the number of parts, reduce the steps for assembly and adjustment, and improve productivity.

Next, optical characteristics for the illumination unit 100 having the above-described configuration will be described.
4 is a cross-sectional view of the illumination unit shown in FIG.
The reflecting mirror member 23 of the illumination unit 100 includes a first reflecting portion 25 and a second reflecting portion 27 that are continuously formed. A light emitting surface of the LED 17 is parabolically arranged at the base end portion of the first reflecting portion 25. An opening 41 is provided for placement at the focal position of the surface mirror 25a. The parabolic mirror 25a of the first reflecting unit 25 has a reflecting surface composed of a parabolic surface with the light emitting surface of the LED 17 as a focal position, and macroscopically directs the light from the LED 17 toward the light emitting side. Reflects in parallel.

  The second reflecting portion 27 is further provided on the light emitting side of the first reflecting portion 25, and is a flat plate-like flat plate arranged in parallel to the arrangement direction of the parabolic mirrors 25a, that is, the arrangement direction of the LEDs 17. A face plate mirror 27a is provided. And the light from LED17 which was not irradiated to the 1st reflection part 25 is received, and it parallelizes and reflects toward the light-projection side. Since the first reflection unit 25 has a predetermined reflection surface region M1 and the second reflection unit 27 has a predetermined reflection surface region M2 continuous to the reflection surface region M1, macroscopically. In other words, the light reflected by the first and second reflecting portions 25 and 27 is irradiated onto the object to be illuminated as a large amount of parallel light.

  The inclination angle of the flat plate mirror 27a with respect to the optical axis of the LED 17 is set to an angle at which the luminous flux from the LED 17 that has not been irradiated onto the first reflecting portion 25 is collimated. In the present embodiment, the inclination angle is set in the range of 20 ° to 27 ° with respect to the optical axis of the LED 17.

  Here, the LED 17 has a wide illuminance angle of, for example, 120 °, and even if the light component emitted toward the side out of the emitted light increases, the first reflection unit 25 and the second reflection. The ratio which is caught by the part 27 and contributes to parallel light conversion becomes high. Thereby, the effect of uniforming the illuminance distribution is further enhanced.

Next, the illuminance distribution by the illumination unit 100 will be described.
FIG. 5 shows a graph showing the illuminance distribution by the lighting unit.
As shown in FIG. 5, the amount of light in the range W <b> 1 composed of the light component directly irradiated from the LED 17 and the light component that arrives with reflection by the first reflection unit 25 and the second reflection unit 27 is in other regions. Compared with, the boundary clearly appears. This is because the light is condensed in the range W1 and the light flux is made substantially parallel light, and the irradiance is high.

FIG. 6 is a graph showing the correlation between the relative intensity of the relative spectral distribution and the wavelength.
The relative spectral distribution is such that light in the wavelength region of 450 to 480 nm is obtained with high intensity, and light in the wavelength region near 560 nm is obtained. Here, a sharp emission peak near 440 nm is emitted light from the blue light-emitting diode, and a broad peak near 560 nm is emission from the phosphor. Moreover, since this spectral distribution does not include light in the wavelength range between 365 nm and 410 nm which is preferred by insects, it is possible to realize the lighting device 200 that is less susceptible to insects such as moths and mosquitoes.

Next, the protruding height of the second reflecting portion will be described.
Figure 7 is a sectional view showing a height protruding on the light emission side of the second reflecting section, Figure 8 is illuminated surface illuminated by the illumination unit having a second reflecting section is set to the height H _M of FIG. 7 FIG. 9 is an explanatory diagram schematically showing the irradiation light of the present invention in (a), and the irradiation light of a comparative example in (b).
Meanwhile, the lighting unit 100 has a height H _M which projects the light exit side of the second reflecting portion 27 is defined at a predetermined height. That is, as shown in FIG. 7, the height H _M, the boundary line of the light beam and its shadow from LED17 emitted from the first reflecting portion 25 on the surface (flat plate mirrors 27a) of the second reflecting portion 27 When the second boundary line 47 is used as the first boundary line 45 and the boundary line between the light flux from the other LED 17 adjacent to the LED 17 on the surface of the second reflecting portion 27 (planar mirror 27a) and its shadow , the height H _M which projects the light exit side of the second reflecting portion 27, the second reflecting portion 27 point on the surface 49 of the first boundary line 45 and the second boundary line 47 is first tolerance high It is set higher than the H _S.

In other words, the height H _M which projects the light exit side of the second reflecting portion 27, by the light flux from LED17 emitted from the first reflecting portion 25 is not irradiated on the second reflecting portion 27, the second the shade 51 that occurs in the reflection portion 27, as shown in FIG. 8, is set at a height H _M can be accommodated without exceeding the second reflecting portion 27 dropped on the light emitting side.

As shown in FIG. 9 (a), the height H _M of the second reflecting portion 27, that is defined in such a value, generated by the light flux from LED17 is not irradiated on the second reflecting portion 27 The shadow 51 in the second reflecting portion 27 is contained within the surface of the second reflecting portion 27, is dropped to the light emitting side beyond the second reflecting portion 27, and does not propagate. Thereby, the influence of the shadow 51 that makes the light distribution non-uniform is reduced, and high-quality uniform illumination light can be obtained.
On the other hand, as shown in FIG. 9 (b), when the height H _M of the second reflecting part or out of the above specified range, there is no second reflector portion as shown in FIG. 9 (c), the shadow As the light 51 is emitted together with the light beam 53, uneven color of illumination light and a mesh-like shadow 51a are generated, resulting in uneven illumination light with unevenness.

  Further, in the illumination unit 100 according to the present embodiment, as shown in FIG. 4, a pair of second reflecting portions 27 are arranged in parallel to the arrangement direction of the LEDs 17 with the LEDs 17 interposed therebetween. Thereby, the light directly incident on the second reflecting portion 27 from the LED 17 is condensed by both the plane plate mirrors 27a and 27a in the pair of second reflecting portions 27 and 27 so that high illuminance is obtained. .

Therefore, according to the illumination unit 100, a first reflecting portion 25 having a parabolic mirror 25a, a second reflecting portion 27 having a flat plate mirror 27a, the height _{H M} of the second reflecting portion 27 surface Is set to be higher than the point 49 on the surface of the second reflecting portion where the first boundary line 45 and the second boundary line 47 are first tolerated, so that the second reflecting portion 27 is not irradiated so that the second The shadow 51 generated in the reflecting portion 27 can be accommodated without dropping to the light exit side beyond the second reflecting portion 27, and the color unevenness of the illumination light and the occurrence of the shadow 51a caused by the shadow 51 being emitted together with the light flux 53 are prevented. it can. As a result, high-quality uniform illumination light 55 can be obtained.

  Moreover, according to the illuminating device 200 provided with the illumination unit 100, since the drive unit 11 that supplies power for driving the LEDs 17 to emit light is provided, power is saved by supplying commercial power to the drive unit 11. However, a uniform illuminance distribution can be obtained at a high illuminance, and illumination light without color unevenness and shadow can be irradiated by the independent single device.

More specifically, the first reflecting portion 25 reflects the light flux from the LED 17 in a substantially parallel direction toward the light emitting side, and the second reflecting portion 27 reflects the light flux from the LED 17 that has not entered the first reflecting portion 25. The illuminance distribution can be made uniform by substantially parallelizing and reflecting toward the emission side. Further, since the irradiance is high, the light irradiation distance can be extended. Since the LED 17 itself serving as the light source is supplied at a low cost, the entire lighting device can be manufactured at low cost, and the power consumption of the light source is significantly lower than incandescent bulbs and fluorescent lamps. Cost can also be reduced. Specifically, the effectiveness of improving the illuminance and irradiation distance by the first and second reflectors 25 and 27 is that, under the same illuminance, the LED 17 consumes 1/6 that of a neon lamp, / 8. This contributes to improving the energy efficiency of lighting and reducing the influence on environmental problems such as CO ₂ emission reduction.

  Moreover, since the LED 17 is driven at a low voltage, troubles after installation such as a shock hazard are unlikely to occur. Further, since the LED 17 hardly contains ultraviolet rays or infrared rays, the irradiation object is not damaged.

  Since the illumination unit 100 is provided with the reflecting mirror composed of the first and second reflecting portions 25 and 27 on the light emitting side of the LED 17, the thickness of the light source unit is reduced compared to the case where it is provided on the back side of the LED 17. Can be configured. This is particularly advantageous when storing in a limited area of installation space such as a showcase.

  In addition, although LED17 comprised the light emission part 21 as the array form which made many units into 1 unit, as long as desired brightness | luminance is obtained, LED may be a single-piece | unit structure. Further, the reflection surface of the parabolic mirror 25a of the first reflection unit 25 may not be strictly a paraboloid, and may be a hyperbola, for example. In any case, it may be a curved surface approximated to a paraboloid, and a fine plane mirror may be formed in a parabolic shape as a whole.

  In addition, the regulation of the height of the 2nd reflection part 27 can obtain uniform illumination light more reliably by applying with respect to each embodiment described below.

(Second Embodiment)
Next, a second embodiment of the lighting unit according to the present invention will be described.
10 is a perspective view of an illumination unit configured with a reflective surface as a ground shape, FIG. 11 is a cross-sectional view of the reflecting mirror member illustrated in FIG. 10, and FIG. 12 is an illuminance distribution by the illumination unit configured with a reflective surface as a ground shape. It is explanatory drawing showing. In the following embodiments, the same components as those shown in FIGS. 1 to 9 are denoted by the same reference numerals, and redundant description is omitted.
In the illumination unit 300 according to the present embodiment, at least one of the reflecting surfaces (parabolic mirror 25b, flat plate mirror 27b) of the first reflecting portion 25 and the second reflecting portion 27 is formed in a ground shape. .

  Examples of the coating surface to be applied to the reflecting surfaces (parabolic mirror 25b, flat plate mirror 27b) of the first reflecting portion 25 and the second reflecting portion 27 described above include finishing by sputtering plating. The sputtering plating process consists of applying a base coat with a dedicated primer, vapor-depositing aluminum in a vacuum, and urethane clear coating on the aluminum vapor-deposited surface. Therefore, for example, by finishing the surface to be coated in a rough state, the light emitting surface after sputtering plating can be formed in a solid shape.

  In addition, the non-reflective reflecting surface can be matte or glossy. This matte or glossy can be changed by preparing an undercoat solution for plating.

  In this configuration, as shown in FIG. 12, the amount of light in a range W2 composed of a light component directly irradiated from the LED 17 and a light component reached with reflection by the first reflection unit 25 and the second reflection unit 27 is Compared with other areas, the boundary clearly appears. This is because the light is condensed in the range W2 and the light flux is made substantially parallel light, and the irradiance is high. In addition, the maximum illuminance is slightly lower than when the light-emitting surface is formed as a mirror surface, but the range W where the illuminance is uniform becomes wider, and a single illumination unit 300 can illuminate a wider range. It becomes. Furthermore, the deflection state of the light can be adjusted by changing the opening angle θ of the flat plate mirror 27b with respect to the optical axis of the LED 17. In other words, the opening angle θ can be increased to widen the illumination range, or the opening angle θ can be decreased to collect light at a specific position. In that case, it is preferable that the first reflecting portion 25 and the second reflecting portion 27 are provided separately without being integrated, and the opening angle θ of the flat plate mirror 27b is adjustable.

  Therefore, according to the illumination unit 300 described above, the illumination unit 300 uses the LED 17 of the multi-color mixing method as a light source, and the first reflection unit 25 including a paraboloid in which the light emitting surface of the LED 17 is a focal position, A second reflecting portion 27 having a pair of parallel reflecting surfaces (flat plate mirrors 27b) arranged in parallel with the LED 17 interposed therebetween is further provided on the light emitting side of the first reflecting portion 25. Since the reflecting surface of the second reflecting portion 27 is formed in a ground shape, the light reflected by this ground-like reflecting surface is specularly reflected when viewed macroscopically, but when viewed microscopically, FIG. As shown by the arrow 43, the light having a different frequency (wavelength) component that is diffused and reflected and dispersed and color-separated is mixed. That is, for example, separated blue light and yellow light are mixed with white light. As a result, the LED light can be condensed with high efficiency, and even when illuminating close, uniform illumination light can be obtained without causing color unevenness and shadows in the irradiation area. The quality of can be further improved.

  Moreover, since the emitted light of the LED 17 is diffused with high efficiency, it is possible to reduce the necessity of arranging each element of the plurality of LEDs 17 with a small individual difference in the emission wavelength of the element itself. In the case of the illumination unit by specular reflection, the emitted light from each LED 17 is used as illumination light as it is, and individual differences in emission wavelengths are conspicuous in the illumination region. Therefore, in order to avoid the occurrence of color unevenness in which illumination light has locally different wavelength components, it is necessary to use LED elements with uniform emission wavelengths. However, since the reflection surface is formed into a ground shape as described above, the reflection is changed from the specular reflection to the diffuse reflection, and even if the emission wavelength of the LED 17 varies, the LED 17 is diffused and becomes illumination light. As a result, the variation in the emission wavelength becomes inconspicuous. As a result, making the reflecting surface into a ground shape eliminates the need to strictly select the light emission characteristics of the LED element used as the light source, enables the use of an inexpensive LED element, and reduces the cost of the lighting device. it can. In addition, in the LED element manufacturing process, LED elements having a large individual difference in emission wavelength are inevitably produced, but these LED elements can be effectively used without being wasted. Therefore, the benefits of using the lighting unit of the present invention are also enjoyed in the LED manufacturing process.

(Third embodiment)
Next, a third embodiment of the lighting unit according to the present invention will be described.
In this embodiment, it is set as the structure for performing illumination of a wide range.
FIG. 13 is an explanatory diagram showing the illumination unit according to this embodiment and the illuminance distribution by this illumination unit.

The lighting unit 400 of the present embodiment is configured in an array by combining a plurality of the lighting units 100 shown in the first embodiment and arranging them in parallel. The arrangement interval of each illumination unit 100 is set so that the total illuminance distribution (indicated by the alternate long and short dash line in the figure) that combines the intensities of the irradiation light from adjacent illumination units 100 is flat.
According to this configuration, by arranging a plurality of illumination units, the range in which the illuminance is uniform can be expanded, and the illuminated area can be expanded without causing a decrease in illuminance. The illumination unit 100 may be the illumination unit 300 of the second embodiment, or may be configured by combining the illumination unit 100 and the illumination unit 300. Thereby, the intensity | strength and uniformity of illumination light can be adjusted appropriately.

(Fourth embodiment)
Next, a fourth embodiment of the lighting unit according to the present invention will be described.
In this embodiment, the illumination unit is configured in an annular shape.
FIG. 14 shows a sectional view (a) and a bottom view (b) of the annular illumination unit.
In the illumination unit 500 of this embodiment, a plurality (12 in this embodiment) of LEDs 17 are arranged along the circumferential direction on a wiring board 19 formed in an annular shape or a disk shape. The number of one reflecting portions 25 corresponding to each LED 17 is individually provided. In addition, the second reflecting portion 27 is formed in an annular shape with an inner peripheral side and an outer peripheral side on the light emitting side of the first reflecting portion 25 so as to cover the first reflecting portion 25 and be integrally formed continuously. Yes.

  According to the illumination unit 500 of this configuration, since the whole is formed in an annular shape, a range where the illuminance is uniform appears in an annular shape, and even if the size of the illumination unit 500 is small, it is uniform over a wide range. Illuminance can be obtained. Moreover, it can be set as the structure which improved the diffusivity also by making it into a ground form also with respect to the reflective surface in this case. Further, by combining the illumination units 500 having different diameter sizes, a plurality of illumination units can be arranged concentrically, and a uniform illuminance can be obtained over a wide range while being small.

(Fifth embodiment)
Next, a third embodiment of the lighting unit according to the present invention will be described.
FIG. 15 is an explanatory view showing a plan view of a lighting unit in which two rows of light emitting diodes are arranged, and (b) showing a BB cross section thereof.
As shown in FIG. 15A, the lighting unit 600 according to the present embodiment has a plurality of LEDs 17 arranged in a plurality of rows (two rows in the example). The first reflecting portions 25 are provided according to the respective LEDs 17, and are arranged in a staggered manner in which the arrangement of each row is shifted in the row direction by ½ of the arrangement pitch of the first reflecting portions 25. Here, as shown in FIG. 15B, the adjacent rows L1 and L2 of the LED 17 and the first reflection unit 25 are arranged so that the first reflection unit 25 is closest to or close to each other. Further, they are arranged with a step G with respect to the light emitting direction.
A pair of second reflecting portions 27 are arranged in parallel to the arrangement direction of the light emitting diodes in the light emitting diode array on both outer sides in the arrangement direction of the plurality of light emitting diode arrays.

  According to the illumination unit 600 configured in this way, since the columns are close to each other, the shadow 51 is reduced, and the step of one adjacent LED 17 (on the opposite side of the light emission direction) The shadow 51 is also reduced by the step G). That is, a boundary line (for example, the first boundary line 45) that is one of the sides sandwiching the apex angle (point 49) illustrated in FIG. 7 is translated to the LED 17 side (lower side in FIG. 7), and the second The substantially triangular shadow 51 sandwiched between the first boundary line 45 and the second boundary line 47 formed on the surface of the reflecting portion 27 is reduced. As a result, the shadow 51 is further reduced, and the generation of color unevenness and shadow of the illumination light is further suppressed.

Further, as shown in FIG. 16, the lighting unit 600 may be configured as a lighting unit 600A by connecting two things.
FIG. 16 is an explanatory view showing a plan view of a modified example in which the illumination units shown in FIG. 15 are used in parallel, with the CC cross section shown in (b).
In this case, the second reflection part 27 of the connecting portion is removed, and the second reflection part 27 is configured to leave only a pair of parts on the outside sandwiching the whole.

Furthermore, as shown in FIG. 17, the lighting unit 600 according to the present embodiment may have LEDs 17 arranged in three rows.
FIG. 17 is an explanatory view showing a plan view of an illumination unit in which three rows of light emitting diodes are arranged, and its DD cross section is shown in (b). In this case, the row L2 arranged in the center is arranged lower by the step G, and the rows L1 and L3 on both sides are arranged higher. Even with such a configuration, the shadow 51 is reduced by the same action as described above, and the generation of uneven color of the illumination light and the shadow 51a can be suppressed. Note that the step G of the LED 17 only needs to have a step difference between adjacent light emitting diode rows, and therefore, the protrusions and recesses may be reversed so that the protrusions and recesses are reversed. In addition, the light emitting diode array may have a length that is approximately the same as the arrangement direction of the light emitting diode arrays, and the second reflecting portion 27 may have a substantially square frame shape.

  In addition, the configuration in which the LEDs according to the present embodiment are arranged in a plurality of rows can be configured by arranging a plurality of LEDs in the array shape shown in FIG. 13 and the annular shape shown in FIG. 14, respectively. You can earn a lot of light. Furthermore, the arrangement | sequence aspect of the some other light emitting diode was shown in FIG. In this case, the illumination unit 600 </ b> C has a plurality of first reflection portions 25 arranged in a zigzag manner inside the annular second reflection portion 27. Also in this case, the light emitting diodes 17 have a step with respect to the light emitting direction between adjacent ones. Moreover, although the hexagonal frame-shaped 2nd reflection part 27 is formed in the figure, it is not restricted to this, Arbitrary polygonal shapes and annular | circular shapes may be sufficient.

Hereinafter, the result of having evaluated the illumination performance of the illuminating device using the illumination unit which concerns on this invention is demonstrated.
The illumination unit 100 in which the reflection surface is formed with a mirror surface in the configuration of the above embodiment is referred to as Example 1, and the illumination unit 300 in which the reflection surface is formed in the configuration of the above embodiment and is formed with ground luster is referred to as Example 2. An illumination unit 300 having a reflecting surface and no ground luster was defined as Example 3. In addition, a lighting unit including only the LED 17 that does not include the first reflecting unit 25 and the second reflecting unit 27 is referred to as Comparative Example 1.

Moreover, the property of the illumination unit used for the Example and the comparative example is shown below.
-Number of LEDs 16-External dimensions of reflector member 23 23.8 mm long, 264 mm wide, height (H) 16.25 mm

  In addition, the gloss of the ground reflecting surface of Example 2 and Example 3 and the absence of gloss were formed by using different undercoat liquids for plating. That is, the plating undercoat liquid of Example 2 used K173NP under manufactured by Toyo Kogyo Co., Ltd., and the plating undercoat liquid of Example 3 used 500 glossy non-made 28 manufactured by Tosho Corporation.

The surface texture of the reflective surface with or without gloss can be identified with a corresponding roughness using, for example, a sandpaper number. That is, the surface texture sand paper equivalent number N ₁ of Example 2 is # 70 ≦ N ₁ ≦ # 100, and preferably # 80 ≦ N ₁ ≦ # 90. Further, the sandpaper equivalent number N _{2 in} Example 3 is # 60 ≦ N ₂ ≦ # 100, preferably # 75 ≦ N ₂ ≦ # 85.

  19 is a graph showing the illuminance characteristics of Example 1, FIG. 20 is a graph showing the light distribution characteristics of Example 1, FIG. 21 is a graph showing the illuminance characteristics of Example 2, and FIG. 23 is a graph showing the light distribution characteristics, FIG. 23 is a graph showing the illuminance characteristics of Example 3, FIG. 24 is a graph showing the light distribution characteristics of Example 3, and FIG. 25 is a graph showing the illuminance characteristics of Comparative Example 1. FIG. 26 is a graph showing the light distribution characteristics of Comparative Example 1. 20, 22, 24, and 26, the angle of the horizontal axis is the angle when rotated 90 degrees symmetrically about the central axis of the light exit surface of the illumination unit 100 with respect to the measuring instrument. It is written. In addition, the solid line in each graph represents the result of measurement using an axis parallel to the longitudinal direction of the illumination unit 300 as the rotation axis, and the wavy line represents the measurement in the direction orthogonal to the rotation axis.

  Table 1 shows the surface properties, power supply, total luminous flux, efficiency, maximum luminous intensity, 1/2 beam angle, and evaluation of Example 1, Example 2, Comparative Example 1, and Comparative Example 2.

  In Example 1, as shown in FIG. 19, an irradiation area with an illuminance of 50 lx was formed with a horizontal distance of about 0.4 m at an irradiation distance of 2 m. Further, as shown in FIG. 20, a luminous intensity of 50 to about 400 cd was obtained at a light distribution angle of −10 to 10 °, but color separation (color separation between blue light and yellow light was performed at a position where the irradiation distance was short. (Unevenness) and shadows were observed, but as the irradiation distance increased, the unevenness and shadows disappeared.

  In Example 2, as shown in FIG. 21, an irradiation region with an illuminance of 10 lx was formed with a horizontal distance of about 0.8 m at an irradiation distance of 2 m. Further, as shown in FIG. 22, a uniform luminous intensity of 20 to about 50 cd was obtained at a light distribution angle of −30 to 30 °, and color separation between blue light and yellow light was not recognized.

  As shown in FIG. 23, in Example 3, an irradiation area with an illuminance of 10 lx is formed with a horizontal distance of about 0.8 m at an irradiation distance of 2 m, and an irradiation area with an illuminance of 20 lx is formed on the inner side thereof with a horizontal distance of 0.4 m. Formed with. Further, as shown in FIG. 24, a luminous intensity of 20 to about 100 cd was obtained at a light distribution angle of −30 to 30 °, and color separation between blue light and yellow light was not recognized.

  In Comparative Example 1, as shown in FIG. 25, an irradiation area with an illuminance of 5 lx was formed with a horizontal distance of about 0.8 m at an irradiation distance of 1.6 m, and sufficient illuminance could not be secured. However, as shown in FIG. 26, an irradiation region in which the light intensity of 0 to about 15 cd changes gently at an orientation angle of −90 ° to 90 ° is formed, and color separation between blue light and yellow light is not recognized. It was.

  Therefore, it is found that each example in which the height of the second reflecting surface is within a specified range can obtain a clear uniformity of the light amount distribution as compared with Comparative Example 1 that does not include the second reflecting surface. did it. In addition, although there is no specific illustration, it has been confirmed that in the form in which the second reflecting surface is set to a height that does not satisfy the specified range, unevenness in the light amount distribution still occurs.

It is a whole block diagram which shows 1st Embodiment of the illuminating device which concerns on this invention. It is the side view (a) and bottom view (b) of an illumination unit. It is a disassembled perspective view of an illumination unit. It is AA sectional drawing of the illumination unit shown in FIG. It is a graph which shows the illumination intensity distribution by an illumination unit. It is a graph showing the correlation between the relative intensity of the relative spectral distribution and the wavelength. It is sectional drawing showing the height which protrudes in the light-projection side of a 2nd reflection part. It is a schematic diagram showing an irradiation surface which is irradiated by the illumination unit having a second reflecting section is set to the height H _M of FIG. It is explanatory drawing which represented typically the irradiation light of the present invention to (a), and the comparative example to (b), (c). It is a perspective view of the illuminating unit which comprised the reflective surface as a plain shape. It is sectional drawing of the reflective mirror member shown in FIG. It is explanatory drawing showing the illuminance distribution by the illumination unit which comprised the reflective surface as a plain shape. It is explanatory drawing showing the illumination unit and the illumination distribution by this lighting unit. It is sectional drawing (a) of an annular | circular shaped illumination unit, and a bottom view (b). It is explanatory drawing which represented the planar view of the illumination unit in which the light emitting diode was arranged in 2 rows, (a), and represented the BB cross section in (b). It is explanatory drawing which represented the planar view of the modification which used the illumination unit shown in FIG. 15 in parallel in (a), and represented the CC cross section in (b). It is explanatory drawing which represented the planar view of the illumination unit by which three rows of light emitting diodes were arranged in (a), and showed the DD cross section in (b). It is explanatory drawing of the illumination unit which has the arrangement | sequence aspect of another some light emitting diode. 3 is a graph showing the illuminance characteristics of Example 1. FIG. 3 is a graph showing light distribution characteristics of Example 1. 6 is a graph showing the illuminance characteristics of Example 2. 6 is a graph showing light distribution characteristics of Example 2. 6 is a graph showing the illuminance characteristics of Example 3. 6 is a graph showing light distribution characteristics of Example 3. 6 is a graph showing the illuminance characteristics of Comparative Example 1. 5 is a graph showing the light distribution characteristics of Comparative Example 1. (A), (b) is a schematic diagram of the conventional illuminating device. It is explanatory drawing showing the condition of the color separation in the conventional illuminating device.

Explanation of symbols

11 Drive unit 17 LED (light emitting diode)
21 Light-emitting part 25 1st reflection part 25a Parabolic mirror (parabolic surface)
25b Parabolic mirror (None)
27 Second Reflector 27a Flat Plate Mirror (Platform Reflective Surface)
27b Flat plate mirror (None)
45 1st boundary line 47 2nd boundary line 51 Shade 100,300,400,500,600,600A, 600B, 600C Illumination unit 200 Illumination device G Level difference H Height protruding to _M light emission side

Claims (9)

A lighting unit using a light emitting diode as a light source,
A light emitting unit having a plurality of light emitting diodes arranged on a base;
A first reflecting portion provided on the light emitting side of the light emitting portion corresponding to each of the plurality of light emitting diodes, and having a parabolic surface in which the light emitting surface of the light emitting diode is a focal position;
A second reflecting portion having a flat reflecting surface that reflects light from the light emitting diode toward the light emitting side on the light emitting side of the first reflecting portion;
With
The boundary line between the light flux from the light emitting diode emitted from the first reflection part on the surface of the second reflection part and its shadow is defined as a first boundary line,
When a boundary line between a light beam from another light emitting diode adjacent to the light emitting diode on the surface of the second reflecting portion and its shadow is a second boundary line,
The height of the second reflecting portion protruding to the light emitting side is set higher than a point on the surface of the second reflecting portion where the first boundary line and the second boundary line first have a tolerance. A lighting unit characterized by having   The lighting unit according to claim 1, wherein a pair of the second reflecting portions are arranged in parallel to the arrangement direction of the light emitting diodes with the light emitting diode interposed therebetween.   The plurality of light emitting diodes are arranged in a plurality of rows, and the second reflecting portions are arranged in parallel to the arrangement direction of the light emitting diodes in the light emitting diode rows, on both outer sides of the plurality of light emitting diode rows. The lighting unit according to claim 1, wherein   The light emitting diode array is a staggered arrangement in which the arrangement pitch of the first reflecting portions in the light emitting diode array is shifted by 1/2 pitch between adjacent light emitting diode arrays in the column direction. Item 4. The lighting unit according to Item 3.   4. The light emitting diode between the light emitting diode rows and another light emitting diode row adjacent thereto has a step with respect to the light emitting direction. 4. The lighting unit according to 4.   The illumination unit according to any one of claims 1 to 5, wherein the reflection surfaces of the first reflection part and the second reflection part are mirror-coated surfaces by vapor deposition.   The lighting unit according to any one of claims 1 to 5, wherein at least one of the reflection surfaces of the first reflection portion and the second reflection portion is formed in a plain shape.   The said light emitting diode is a white light emitting diode which has a blue light emitting diode and the fluorescent substance which converts the blue light from this blue light emitting diode into yellow light, The any one of Claims 1-7 characterized by the above-mentioned. The lighting unit according to claim 1. The lighting unit according to any one of claims 1 to 8,
A drive unit for supplying power for driving the light emitting diode to emit light;
An illumination device comprising:

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