JP2014220260A - Lighting unit and led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device which makes substantially constant light distribution angles of reflection members composed of desired curvature radii for distributing the emission light of an LED light source and conic coefficients, is easy in the adjustment of an emission angle, and can obtain a radiation face which is small in luminance irregularity even if the number of mounting LED elements is reduced.SOLUTION: An LED lighting device has a flat plate shaped LED base board 12 on which an LED light source is arranged, and a plurality of reflection members 13a, 13b and 13c which are composed of desired curvature radii for distributing the emission light of LED elements 11 and conic coefficients, and also comprises a plurality of LED units in which the LED elements 11 are arranged at substantial-focus points of the respective reflection members. A radiation angle is adjusted while maintaining distribution angles substantially constant by inclining rotating symmetric axes A of the respective reflection members in left and right directions within a range of 0 to 30 degrees with respect to main optical axes B of the LED elements 11.

Description

  The present invention relates to an illumination unit and an LED illumination device that emits light by controlling the light distribution angle of an LED with a light conversion element, and synthesizes each emitted light to obtain an irradiation surface with less illuminance unevenness.

2. Description of the Related Art In recent years, with increasing environmental awareness, LED lighting devices using LED elements with excellent power savings as light sources have been actively used. Particularly recently, an LED lighting device that can be used as a substitute for a high-intensity discharge lamp (HID lamp) such as a mercury lamp used for a high ceiling light, a road light, a parking lot light, etc. has been demanded. In order to realize this, a large number of high-brightness LED elements must be arranged on the LED substrate at a high density.
However, since the LED has a strong directivity, when a high-luminance LED lighting device is created, the lighting device has a large illuminance unevenness on the irradiated surface.

  Therefore, several LED lighting devices for improving the illuminance unevenness of the irradiated surface have been proposed. For example, the LED lighting device described in Patent Document 1 has an LED element arranged facing a concave reflector. A reflective LED illuminating apparatus in which a plurality of reflective LED units in which one or more reflective LED elements that reflect light so as to have a predetermined irradiation angle are aligned are arranged in a plane, and the reflective LED All or a part of the unit has an irradiation angle inclined with respect to a right-angle axis of the apparatus substrate, and a part of the reflective LED unit in the unit has an irradiation angle different from other reflective LED units. The light distribution characteristic that is arranged and synthesized by the total reflection type LED unit can be adjusted to an arbitrary characteristic.

  In addition, the LED lighting device described in Patent Document 2 is arranged with LED elements facing a concave reflector and aligns one or more reflective LED elements that reflect light so as to have a predetermined irradiation angle. A reflective LED illuminating device in which a plurality of reflective LED units are arranged in a plane, and the current supplied to the reflective LED unit disposed in the peripheral portion is the other reflective LED unit disposed inside The light distribution characteristic combined with the total reflection type LED unit can be adjusted to an arbitrary characteristic.

  However, in the invention of Patent Document 1, since a total reflection type LED element is used, the light distribution angle is narrow, so that in order to obtain a uniform illuminance of the irradiated surface, it is shown in FIG. As shown in the figure, it is necessary to arrange a large number of LED units composed of a large number of LED elements densely in the vertical and horizontal directions, and change the angle of each adjacent LED unit little by little. Therefore, it is difficult to assemble and inferior in productivity. In addition, all LED units are mounted on a single substrate, and each is angle-adjusted by a mechanism for adjusting the irradiation angle described in [0017] in the specification of the same document. A specific angle adjusting method is not described, and it seems difficult to individually adjust the angles of the LED units arranged vertically and horizontally. The invention of Patent Document 2 has the same problem.

JP-A-11-195307 JP-A-11-195317

  The present invention makes the light distribution angle of the reflecting member consisting of the desired curvature radius and conic coefficient for distributing the emitted light of the LED light source substantially constant, makes it easy to adjust the emission angle, and reduces the number of LED elements mounted. However, the present invention provides an illumination unit and an LED illumination device that can obtain an irradiation surface with little illuminance unevenness.

In order to solve the above-mentioned problem, in the illumination unit of the invention according to claim 1, a flat LED substrate on which the LED light source is installed, and a desired radius of curvature for distributing the emitted light of the LED light source And a plurality of reflecting members made of a conic coefficient, and an illumination unit comprising a plurality of LED units in which the LED light source is arranged at a substantially focal position of the reflecting member,
The angle of rotation of each of the reflecting members is tilted in the left-right direction within a range of 0 to 30 degrees with respect to the main optical axis of the LED light source, and the irradiation angle is adjusted with the light distribution angle being substantially constant. It is a feature.

  In the illumination unit according to the second aspect of the present invention, the rotational symmetry axis of each of the reflecting members is inclined in the left-right direction within a range of 0 degrees to 20 degrees with respect to the main optical axis of the LED light source. The irradiation angle is adjusted while keeping the light distribution angle substantially constant.

  In the illumination unit of the invention according to claim 3, the reflection member has an emission opening from which LED light is emitted, and the inside of the emission opening is determined by a desired radius of curvature and a conic coefficient. The reflection surface has a shape to be formed, and the distance from the focal position of the reflection surface to the opening surface forming the emission opening is adjusted to obtain a light distribution angle of the predetermined LED emission light.

  In the illumination unit according to the fourth aspect of the present invention, a light diffusing member for diffusing light is arranged on the outgoing light side of the LED unit.

  In the illumination unit of the invention according to claim 5, the light diffusing member is an anisotropic diffusing member in which the emitted light diffuses in the minor axis direction of the elliptical spot light irradiated on the irradiated surface. It is characterized by arranging things.

  Moreover, in the LED illumination device of the invention according to claim 6, any one of the illumination units according to claims 1 to 5 is provided on each surface in the LED irradiation direction of a polygonal substrate comprising a plurality of surfaces. It is arranged.

  In the LED lighting device according to the seventh aspect of the present invention, the polygonal substrate is rotatably attached to the lighting device body substrate.

  According to the first to third aspects of the present invention, the LED light source is disposed at the focal position of the reflecting member having a desired radius of curvature and conic coefficient, whereby the light distribution angle (in the light distribution curve, the maximum luminous intensity is 1 / It is possible to obtain spot light with less illuminance unevenness by making the angle at which the luminous intensity becomes 2 (which represents the degree of spread of the emitted light from the LED light source) to some extent.

  In addition, by using a reflecting member having a reflecting surface on the inner wall and adjusting the height of the reflecting surface in the rotational symmetry axis direction, the light distribution angle is obtained by combining the directly emitted light from the LED light source and the primary reflected light. Can be easily adjusted, and spot light with a desired size and less uneven illuminance can be easily obtained.

Further, the height of the reflective surface in the rotationally symmetric axis direction is adjusted by joining the flat bottom opening of the reflective member cut by the virtual plane and the flat LED substrate on which the LED light source is mounted. It is possible to easily produce the LED lighting unit.
Further, by appropriately changing the cutting angle of the virtual plane with respect to the rotationally symmetric axis of the reflecting surface, an LED illumination unit that can control the direction of the optical axis of the emitted light while maintaining the light distribution angle can be easily obtained.

  Furthermore, an LED illumination unit having a plurality of LED light emission directions can be obtained with a single reflecting member, and an LED illumination unit that combines a plurality of spotlights with little unevenness in illuminance and can be easily mass-produced can be produced. .

  According to the invention of claim 4, by diffusing spot light with less illuminance unevenness, an irradiation surface with less illuminance unevenness can be obtained with a smaller number of LED illumination units.

  According to the invention of claim 5, an elliptical spot light extending to the far side is converted into a circular diffused light by using an anisotropic diffusion sheet or a diffusion plate for diffusing light in the minor axis direction. The gap between the spot light and the spot light becomes brighter, and an irradiated surface with less illuminance unevenness can be obtained.

  According to the invention of claim 6 and claim 7, by using a polygonal substrate in which the angle between adjacent sides is adjusted in accordance with the shape of the irradiated surface, an irradiation surface with less illuminance unevenness can be obtained. A lighting device can be provided.

  In addition, an LED illumination device can be provided in which an illumination surface with less illuminance unevenness is obtained by combining the spot light by rotating the axes of a plurality of illumination units in accordance with the shape of the illuminated surface.

1 is an external perspective view of a lighting device according to Embodiment 1. FIG. Image of parking lot Sectional drawing of the LED unit concerning Embodiment 1 Correlation diagram of the height of the reflecting surface (distance between the aperture surface of the reflecting member and the focal point) and the light distribution angle Sectional drawing of the reflecting member concerning Embodiment 1 External perspective view of the gantry according to the first and second embodiments External perspective view of polygonal substrate according to Embodiment 1 FIG. 3 is an external perspective view defining the end face of each polygonal substrate according to the first embodiment. Brightness of the irradiated surface (simulation) by the illumination device according to the first embodiment External perspective view of lighting apparatus according to Embodiment 2 External perspective view of LED unit according to Embodiment 2 Sectional drawing of the LED unit concerning Embodiment 2. Brightness of the irradiated surface (simulation) by the illumination device according to the second embodiment External perspective view of lighting apparatus according to Embodiment 3 The front view of the illuminating device concerning Embodiment 3. External appearance perspective view of the added mount frame concerning Embodiment 3 Sectional drawing of the LED unit concerning Embodiment 3. An image diagram showing a function of an anisotropic diffusion sheet according to Embodiment 3 Irradiation light image diagram of the LED unit that irradiates far away according to the first and second embodiments Irradiation light image diagram of LED unit that irradiates far away according to the third embodiment

Preferred embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example, and the present invention is not limited to this.
The illuminating device of the present embodiment is composed of various members as shown in FIG. 1, and the irradiation position and the irradiation angle of the emitted light from the LED unit 10 having the irradiation range controlled by the reflecting member 13 are illumination. The illumination device is adjusted by the units 20, 30, 40 and the gantry 50, 60, 70, and synthesizes a plurality of emitted lights from the LED unit 10 to irradiate a desired irradiation area with a desired brightness.
In addition, the illumination distribution regarding the light distribution angle and irradiation area described below is simulated using the optical design software Zemax.

(Embodiment 1)
The lighting device 100 according to the first embodiment is used as a parking lot light, and is attached in the vicinity of the top of the support column 1 installed at the intermediate point of the parking area as shown in FIG. The parking area 2 having a length of 6 m and a length of 12.5 m is irradiated so as to be 2 lux or more, and the road 3 having a width of 3 m and a length of 12.5 m is irradiated so as to be 10 lux or more.

  As illustrated in FIG. 1, the lighting device 100 includes the flat lighting device body substrate 90 and the lighting units 20, 30, and 40 attached to the flat lighting device main body substrate 90 via the three bases 50, 60, and 70 having a rotation axis. Yes. The LED unit 10 is attached to the light emission side of the illumination units 20, 30 and 40.

As shown in FIG. 3, the LED unit 10 includes an LED substrate 12 on which the LED element 11 is mounted, and a reflecting member 13 fixed to the LED substrate 12.
The inner wall of the reflecting member 13 is a reflecting surface formed of a part of a rotating paraboloid having a conic coefficient of −1, and is an LED cut by a virtual plane orthogonal to the rotational symmetry axis A of the rotating paraboloid. It is formed by an emission opening 14 from which light is emitted and a bottom opening 15 cut by a virtual plane passing through a substantially focal position of the paraboloid of revolution. On the LED substrate 12, the reflection member 13 is fixed so that the end surface of the bottom opening 15 abuts on the entire circumference.
The LED element 11 is mounted so as to be positioned substantially at the focal point of the reflecting member 13, and the height h1 of the reflecting member (the distance from the focal position to the virtual plane forming the exit opening) is changed. Thus, the light distribution angle composed of the direct light α and the reflected light β can be controlled as shown in FIG.

Further, as shown in FIG. 5 (a), a reflection in which the main optical axis B of the LED light source (a straight line along the angle indicating the maximum luminous intensity in the light distribution curve) coincides with the rotational symmetry axis A of the paraboloid of revolution. As shown in FIGS. 5 (b) and 5 (c), the member 13a and three types of reflecting members 13b and 13c shifted by [theta] 1 to the left and right are used (in FIG. 5 (a), it is easy to understand. For this reason, the rotational symmetry axis A and the main optical axis B are drawn while being shifted, but they are actually overlapped). By adjusting the angle θ1, the irradiation angle can be controlled. When θ1 is 0 degrees to 30 degrees, the light distribution angle can be made constant to some extent. Therefore, it is preferable to adjust the irradiation angle within this angle range. Further, when θ1 is 0 ° to 20 °, the irradiation angle can be changed while the light distribution angle is substantially constant. Therefore, it is particularly preferable to adjust the irradiation angle within this angle range.
Each of the reflecting members is molded using ABS and formed into a parabolic shape, and then a plating surface is formed by aluminum plating. However, a known resin such as PBT resin or polycarbonate resin is used as the molding resin. it can. Moreover, you may create a reflective surface by aluminum vapor deposition instead of plating.

As shown in FIG. 1, the illumination units 20, 30, 40 include three polygonal substrates 21, 31, 41 having the same shape and nine LED units 10 corresponding to the respective installation positions.
As shown in FIG. 6, each of the mounts 50, 60, 70 is provided with surfaces 51, 61, 71 that abut against the substrate and surfaces 52, 62, 72 that abut against the illumination unit. Irradiation unevenness by adjusting the angle between the surface and the surface, the angle between the adjacent surfaces forming the polygonal substrates 21, 31 and 41, and the power supplied to each LED unit 10. It is possible to irradiate a parking lot in a state with little.
Note that a light-transmitting cover may be provided on the outgoing light side of the lighting device 100 so as to cover the lighting device main body substrate 90, and further, along the peripheral edge of the cover on the side close to the lighting device main body substrate 90. A reflection layer or a reflection member may be provided on the inner side wall portion to reduce light leaking outside the parking lot.

(Experimental example 1)
Next, an experimental example showing the effect of the LED lamp 100 according to the first embodiment will be specifically described.
Spot light having a light distribution angle of 20 degrees was obtained by setting the conic coefficient of the reflecting surfaces of the reflecting members 13a, b, and c to -1, the radius of curvature to 2.4 mm, and the height h1 to 9.6 mm.
As shown in FIG. 7, the polygonal substrates 21, 31, and 41 are formed in a hexagonal shape by bending a long flat plate into a mountain fold along the width direction and joining edges. The polygonal substrate end surfaces 24, 34, 44 shown in FIG. 8 are parallel to the opposing polygonal substrate end surfaces 22, 32, 42, respectively. As shown in FIG. 7, the polygonal substrate end surfaces 23, 33, 43 are parallel to each other. The polygonal substrate end surfaces 25, 35, 45 are bent at an angle of 20 degrees from the corresponding polygonal substrate end surfaces 24, 34, 44, respectively.

  As shown below, LED units corresponding to the respective polygonal substrate end faces of FIG. 8 are joined to the illumination units 20, 30, and 40. The LED unit 10 on which the reflecting member 13a shown in FIG. 5 is mounted is joined to the polygonal substrate end faces 23, 24, 25, 34, and 44. The LED unit 10 on which the reflecting member 13b whose rotational symmetry axis A is inclined downward by 5 degrees along the width direction of the polygonal substrate is bonded to the polygonal substrate end faces 33 and 45. The LED unit 10 on which the reflecting member 13c whose rotational symmetry axis A is inclined upward by 5 degrees is joined to the polygonal substrate end faces 35 and 43 along the width direction of the polygonal substrate.

As shown in FIG. 6, each of the gantry 50, 60, 70 is bent at one end of a rectangular flat plate by 90 degrees along the width direction to form gantry end surfaces 51, 61, 71. It is fixed in contact. Further, when the illuminating device main body substrate 90 is arranged on the xy coordinate plane so that the irradiation direction is on the positive side of the z axis in the xyz orthogonal coordinate space, the other end surface of the gantry 50 is indicated by an arrow with respect to the orthogonal coordinates in FIG. As shown, the pedestal end face 52 was formed by bending parallel to the x-axis so as to be inclined 30 degrees counterclockwise from the y-axis on the yz coordinate plane in the z-axis direction.
Similarly, the other end surface of the gantry 60 is inclined by 30 degrees on the yz coordinate plane, and further in the z-axis direction clockwise from the x-axis on the xz-coordinate plane as indicated by an arrow in the orthogonal coordinates in FIG. The gantry end face 62 was formed by being bent so as to be inclined by 120 degrees.
Similarly, the other end surface of the gantry 70 is inclined by 30 degrees on the yz coordinate plane, and further in the z-axis direction clockwise from the x-axis on the xz-coordinate plane as indicated by an arrow in the orthogonal coordinates in FIG. The gantry end face 62 was formed so as to be inclined by 60 degrees. Each of the gantry 50, 60, 70 rotates a lighting unit around a rotation axis D and a free rotation mechanism (not shown) that can rotate with respect to the lighting device main body substrate 90 around the rotation axis C. A free rotation mechanism (not shown) is included.

  FIG. 9 shows the result of simulating the brightness of the parking lot by the parking lot light when the brightness of each LED unit is set as shown in Table 1 in the lighting device 100 described above. The lighting device can illuminate at a desired brightness, eliminates unnecessary brightness, and has less illuminance unevenness in each illumination area.

(Embodiment 2)
The illumination device 200 according to the second embodiment is also used as a parking lot lamp as in the first embodiment.

  As shown in FIG. 10, in the lighting device 200, the LED units 110, 210, and 310 are attached to the same lighting device main body substrate 90 as in the first embodiment via the three mounts 50, 60, and 70. . The LED units 110, 210, and 310 include LED boards 112, 212, and 312 on which the LED elements 111 shown in FIG. 12 are mounted, and reflecting members 113, 213, and 313 joined to the LED boards 112, 212, and 312. Consists of.

The reflecting members 113, 213, and 313 are formed in a rectangular parallelepiped as shown in FIG. 11, and three reflecting surfaces made of a paraboloid are formed inside the reflecting member as shown in FIG. And an exit opening for emitting LED light to one end face side of the reflecting member, and a bottom opening formed on the opposite face side of the exit opening. The LED substrates 112, 212, and 312 are bonded to the surface where the bottom opening is formed as shown in FIG. The same reflective surface as in Experimental Example 1 was used.
The LED element is positioned at the focal point of the paraboloid of revolution when the angle formed between the rotational symmetry axis A of the reflecting surface and the main optical axis of the LED element 111 or the straight line B orthogonal to the LED substrate is 0 degree. A height h2 of the reflecting members 213, 313, and 413 is set.

The angle θ formed by the rotational symmetry axis A of each reflecting surface and the straight optical axis B of the LED element 111 or the straight line B orthogonal to the LED substrate is adjusted so as to match the shape of the irradiation area of the parking lot. The three reflecting surfaces formed on the member are different from each other. Further, the rotational symmetry axis of the reflecting surface located on the L side of the illumination device main body substrate shown in FIG. 10 is θL, the LED element is 111L, the rotational symmetry axis of the reflecting surface located on the R side is θR, the LED element is 111R, The rotational symmetry axis of the reflection surface located in the middle is θC, and the LED element is 211C.
As in the first embodiment, the angle between the surface of each pedestal joined to the illumination device body and the surface joined to the illumination unit, the inclination of the rotational symmetry axis A in FIG. 12, and the LED units 110, 210, 310. By adjusting the power supplied to each of the LED elements 111L, 111C, and 111R, it is possible to irradiate each area of the parking lot with little irradiation unevenness.

(Experimental example 2)
Next, an experimental example showing the effect of the LED lamp 200 according to the second embodiment will be specifically described.
On the LED element mounting surface side of the flat LED substrates 112, 212, and 312 on which the LED element 111 is mounted, the reflecting members 113, 213, and 313 made of a rectangular parallelepiped with flat surfaces are on the focal position side of the paraboloid The entire circumference of the opening is abutted and joined as shown in FIG.
An xyz orthogonal coordinate space consisting of a z-axis orthogonal to the plane on which the LED element 111 of the LED substrate is mounted and an x-axis parallel to a folding line for bending the end faces 52, 62, 72 of the gantry. As shown in FIG.
The angles measured in the directions of the dotted arrows with the z axis as 0 degrees formed when the rotational symmetry axis A is projected onto the xz plane are θL2, θC2, and θR2. Similarly, θL3, θC3, and θR3 are angles measured in the directions of dotted arrows with the z-axis being 0 degrees formed when the rotationally symmetric axis A is projected onto the yz plane.
Reflective members 113, 213, and 313 having a rotational symmetry axis A as described in Table 2 were molded using ABS resin. Moreover, the result of having simulated the brightness of the parking lot when setting and irradiating LED element 111L, 111C, 111R of each LED unit 110,210,310 as shown in Table 3 is FIG.

(Embodiment 3)
The illumination device 300 according to the third embodiment is also used as a parking lot light as in the first embodiment.

As shown in FIGS. 14 and 15, the lighting device 300 has a structure in which a gantry 80 and an LED unit 410 are additionally installed in the lighting device 200 of the second embodiment. Each LED unit includes a light diffusion sheet. Are joined. Other than that is the same as the illuminating device of Example 2.
As shown in FIG. 16, the gantry 80 is formed such that one end of a rectangular flat plate is bent 90 degrees along the width direction to form a gantry end surface 81, and is fixed in contact with the lighting device main body substrate 90. Further, in the xyz orthogonal coordinate space, when the illuminating device main body substrate 90 is arranged on the xy coordinate plane so that the irradiation direction is on the positive side of the z axis, the other end surface of the gantry 80 is indicated by an arrow with respect to the orthogonal coordinates in FIG. As shown, the gantry end face 72 was formed by bending parallel to the x-axis so as to incline 60 degrees counterclockwise from the y-axis in the z-axis direction on the yz coordinate plane. The LED unit 410 is joined to the gantry end surface 82.

As shown in FIG. 17, anisotropic diffusion sheets 114, 214, and 314 are joined to the LED units 110, 210, and 310 so as to cover the openings on the outgoing light side of the reflecting members 113, 213, and 313. Yes.
The LED unit 410 uses the same LED substrate 112 and the reflective member 113 as in the second embodiment, and a diffusion sheet 414 that diffuses isotropically is bonded to the surface of the reflective member 113 on the outgoing light side. ing.

As shown in FIG. 18, the anisotropic diffusion sheets 114, 214, and 314 are diffusion sheets having a function of diffusing incident light in a desired direction, and have a circular shape as shown in FIG. The spot light can be changed to an elliptical diffused light as shown in FIG.
Light emitted from the LED units 110, 210, and 310 of the present embodiment is irradiated with an inclination of 25 degrees to 35 degrees with respect to the irradiated surface as shown in FIG. Therefore, as in the simulation results of Embodiments 1 and 2 (FIGS. 9 and 13), the shape of each spot light on the irradiated surface is an ellipse having a long major axis. By bonding the anisotropic diffusion sheets 114, 214, and 314 to the reflecting members 113, 213, and 313 so as to diffuse light in the minor axis direction of the elliptical spot light, the substantially circular shape as shown in FIG. Diffuse light can be obtained. The LED unit 410 that irradiates the vicinity of the illumination device emits light only from the LED element located at the center, and the isotropic diffusion sheet 414 brightens the vicinity of the illumination device.
As described above, by composing the LED unit by combining the anisotropic diffusion sheet and the isotropic diffusion sheet corresponding to the irradiation angle, an irradiation surface with more uniform brightness can be obtained.

1: pillar, 2: parking area, 3: roadway, 10: LED unit, 11: LED element, 12: LED board, 13 and 13a and 13b and 13c: reflecting member, 14: exit opening, 15: bottom opening Part, 20 and 30 and 40: lighting unit, 21 and 31 and 41: polygon substrate, 22 to 25 and 32 to 35 and 42 to 45: polygon substrate end face, 50 and 60 and 70 and 80: frame, 90: Illumination device main board, 100 and 200 and 300: Illumination device, 110 and 210 and 310 and 410: LED unit, 111L and 111C and 111R: LED element, 112 and 212 and 312 and 412: LED substrate, 113, 213 and 313 And 413: reflecting member, A: axis of rotational symmetry of reflecting surface, B: main optical axis of LED light source, C and D: gantry Rotating shaft, alpha: direct light, beta: 1-order reflected light, .theta.1 and θL and θC and θR and θL2 and θC2 and θR2 and θL3 and θC3 and Shitaaru3: angle formed between A and B

Claims (7)

A flat LED board on which an LED light source is installed; and a plurality of reflecting members each having a desired radius of curvature and a conic coefficient for distributing light emitted from the LED light source. An illumination unit including a plurality of LED units arranged at a substantially focal position of a member,
The angle of rotation of each of the reflecting members is tilted in the left-right direction within a range of 0 to 30 degrees with respect to the main optical axis of the LED light source, and the irradiation angle is adjusted with the light distribution angle being substantially constant. A lighting unit characterized by that.   The angle of rotation of each of the reflecting members is tilted in the left-right direction within a range of 0 to 20 degrees with respect to the main optical axis of the LED light source to adjust the irradiation angle while keeping the light distribution angle substantially constant. The lighting unit according to claim 1.   The reflection member has an emission opening from which the LED light is emitted, and the inside of the emission opening is a reflection surface having a shape determined by a desired radius of curvature and a conic coefficient, and from the focal position of the reflection surface The illumination unit according to claim 1 or 2, wherein a light distribution angle of predetermined LED emission light is adjusted by adjusting a distance to an opening surface forming the emission opening.   The illumination unit according to any one of claims 1 to 3, wherein a light diffusing member for diffusing light is disposed on the outgoing light side of the LED unit.   5. The light diffusion member according to claim 4, wherein the light diffusion member is an anisotropic diffusion member that diffuses outgoing light in a minor axis direction of an elliptical spot light irradiated on an irradiated surface. Lighting unit.   6. The LED illumination device according to claim 1, wherein the illumination unit according to claim 1 is disposed on each surface in the LED irradiation direction of a polygonal substrate having a plurality of surfaces.   The LED illumination device according to claim 6, wherein the polygonal substrate is rotatably attached to the illumination device main body substrate.