JP5762334B2 - Lighting device - Google Patents

Description

  The present invention relates to an illuminating device, and more particularly to an illuminating device including a light source having a predetermined directivity in an irradiance distribution.

  2. Description of the Related Art In recent years, for example, lighting apparatuses that are used for indoor lighting such as houses are equipped with light emitting elements such as LEDs (Light Emitting Diodes) as light sources. LEDs have characteristics such as high brightness, low power consumption, and long life, and further contribute to miniaturization and weight reduction of lighting devices.

  However, since LEDs have a relatively strong directivity in the irradiance distribution compared to incandescent bulbs and fluorescent lamps, when they are configured to irradiate directly into the room, they are emitted from the LEDs. There is a problem that glare occurs when the emitted light directly enters the eyes of the user. Therefore, it is important to design a device so that such a problem does not occur in an illumination device including an LED as a light source.

  As an illuminating device configured to suppress the occurrence of the glare, for example, Japanese Patent Application Laid-Open No. 2011-192475 (Patent Document 1), Japanese Patent Application Laid-Open No. 2011-204699 (Patent Document 2), and Japanese Patent Application Laid-Open No. 2011-204700. There exists a thing disclosed in gazette (patent documents 3) etc.

  In the illumination devices disclosed in Patent Documents 1 to 3, a plurality of LEDs are arranged so as to face the radially outer side at the center of the device body having a flat and substantially cylindrical outer shape. A reflector is provided on the top plate and the side wall so as to face the plurality of LEDs, and most of the light that is emitted radially outward from the plurality of LEDs is reflected by the reflector. In this way, the light is irradiated to the outside through an illumination window provided on the bottom plate of the apparatus main body.

  With this configuration, most of the light emitted from the LED is not directly emitted to the outside of the apparatus main body. Therefore, even when the user looks directly at the illumination device from below, the light is emitted from the LED. The light does not enter the user's eyes directly. Therefore, the occurrence of glare is suppressed, and the burden on the user's eyes is greatly reduced.

JP 2011-192475 A JP2011-204699A JP 2011-204700 A

  By the way, in a lighting device, it is important to ensure uniformity of light in all directions where light is irradiated. As described above, since the LED has a relatively strong directivity in the irradiance distribution, it is difficult to ensure the uniformity of the light in an illumination device equipped with the LED as a light source. Become. Therefore, by adjusting the LED arrangement position and arrangement pitch, the reflector arrangement position and arrangement angle, etc., as appropriate, the illuminance unevenness of the light emitted from the apparatus body is suppressed, thereby ensuring the uniformity of the light. It has been.

  For example, in the illumination devices disclosed in Patent Documents 1 to 3, a holding frame having a regular polygonal column outer peripheral surface is provided in a substantially central portion of the apparatus main body, and a plurality of LEDs are provided on the outer peripheral surface of the holding frame. Are arranged in a line at substantially equal intervals along the circumferential direction, thereby suppressing the occurrence of illuminance unevenness.

  Here, the reason why the outer peripheral surface of the holding frame is not a columnar shape but a regular polygonal column is that when mounting an LED, the optical axis of the LED is positioned with high accuracy on the holding frame having a curved mounting surface. This is because it is difficult to implement. That is, by making the outer peripheral surface of the holding frame into a regular polygonal column that approximates a columnar shape, it is possible to mount the LEDs with high accuracy by using the mounting surface as a planar shape, and to suppress the occurrence of uneven illumination. .

  Further, in the illumination devices disclosed in Patent Documents 1 to 3, since there is a concern that the luminance may decrease in the vicinity of the corner of the outer peripheral surface of the regular polygonal columnar shape of the holding frame, the arrangement pitch of the LEDs in the vicinity of the corner. Is made smaller than the arrangement pitch of the LEDs in the central part located between the corners, so that the LEDs are arranged more densely in the parts, thereby suppressing the above-described decrease in luminance in the vicinity of the corners. It is said.

  When the above configuration is adopted, the generation of uneven illuminance can be suppressed as the number of LEDs arranged linearly on each surface of the holding frame is increased. However, when the number of LEDs arranged linearly on each surface of the holding frame is not so large, the above configuration cannot be expected to sufficiently suppress uneven illuminance.

  Therefore, in an illuminating device including a light source having a predetermined directivity in the irradiance distribution, in order to more reliably suppress the occurrence of illuminance unevenness, the arrangement position of the light source or the It can be said that it is desirable to optimize the arrangement pitch.

  The present invention has been made in view of the above-described problems, and an object of the present invention is to provide an illumination device that is easy to manufacture and that can reliably suppress the occurrence of uneven illuminance.

  The illumination device according to the first aspect of the present invention includes a plurality of light sources arranged in a plane orthogonal to the central axis of the device main body, and a holding member that holds the plurality of light sources. The holding member is provided at a central portion of the apparatus main body. The plurality of light sources are held by the holding member so that two or more and the same number are provided on each side of a virtual regular polygon centered on a point where the plane and the central axis intersect. The optical axes are arranged so that their respective optical axes are orthogonal to the sides of the virtual regular polygon and the emission direction faces outward.

  Here, in the illumination device according to the first aspect of the present invention, a circle of the circumscribed circle of the virtual regular polygon so that a part thereof passes through each vertex of the virtual regular polygon. When a line segment whose circumference is equally divided by twice the total number of the plurality of light sources is drawn radially from the center, one vertex of the virtual regular polygon among the drawn line segments As a reference to the line segment passing through the line segment, at the intersection of the line segment that is evenly positioned around the center in the plane and the side of the imaginary regular polygon or in the vicinity thereof, the plurality of lines The light sources are respectively arranged.

  An illumination device according to the second and third aspects of the present invention holds a plurality of light sources arranged in a plane orthogonal to the central axis of the device body, the plurality of first light sources, and the plurality of second light sources. Holding member. The plurality of light sources includes a plurality of first light sources that respectively emit light of a first color, and a plurality of second light sources that respectively emit light of a second color different from the first color. Is included. The total number of the plurality of second light sources is smaller than the total number of the plurality of first light sources. The holding member is provided at a central portion of the apparatus main body. The plurality of first light sources are held by the holding member, so that two or more of the first light sources are provided on each side of a virtual regular polygon centered on a point where the plane intersects the central axis. In addition, the same number of optical axes are arranged, the optical axes thereof are orthogonal to the sides of the virtual regular polygon, and the emission directions thereof face outward. The plurality of second light sources are held by the holding member, so that the same number is arranged for each side at a position on the side of the virtual regular polygon, and the respective optical axes thereof are the virtual regular many. They are arranged so that they are orthogonal to the sides of the square and the emission direction faces outward.

  Here, in the illumination device according to the second aspect of the present invention, a circle of a circumscribed circle of the virtual regular polygon so that a part thereof passes through each vertex of the virtual regular polygon. When a line segment whose circumference is equally divided by twice the total number of the first light sources is drawn radially from the center, one vertex of the virtual regular polygon among the drawn line segments As a reference to the line segment passing through the line segment, at the intersection of the line segment that is evenly positioned around the center in the plane and the side of the imaginary regular polygon or in the vicinity thereof, the plurality of lines Each of the first light sources is arranged, and the circumference of the circumscribed circle of the virtual regular polygon is set so that a part of the first light source passes through each vertex of the virtual regular polygon. This is the case when a line segment equally divided by twice the total number is drawn radially from the center. A line segment that passes through one vertex of the virtual regular polygon among the plurality of line segments drawn as a reference and is even-numbered around the center in the plane. The plurality of second light sources are respectively disposed at or near the intersection of the minute and the side of the virtual regular polygon.

  On the other hand, in the illumination device according to the third aspect of the present invention, the circumference of the circumscribed circle of the virtual regular polygon so that a part thereof passes through each vertex of the virtual regular polygon. When a line segment equally divided by a number twice the sum of the total number of the plurality of first light sources and the total number of the plurality of second light sources is drawn radially from the center, the plurality of line segments drawn A line segment passing through one vertex of the imaginary regular polygon of the imaginary regular polygon as a reference, and a line segment that is even-numbered around the center in the plane and the imaginary regular polygon One of the plurality of first light sources and the plurality of second light sources is arranged at or near the intersection with the rectangular side. The plurality of second light sources are respectively arranged at or near a predetermined intersection of the intersections or the vicinity thereof where any of the plurality of first light sources and the plurality of second light sources are arranged. The plurality of first light sources are respectively disposed at the remaining intersection or the vicinity thereof in the intersection or the vicinity thereof where any of the plurality of first light sources and the plurality of second light sources is disposed. Here, the predetermined intersection point is the circumference of the circumscribed circle of the virtual regular polygon as the total number of the plurality of second light sources so that a part thereof passes through each vertex of the virtual regular polygon. When a line segment equally divided by two times is drawn radially from the center, this is based on the line segment passing through one vertex of the virtual regular polygon among the drawn line segments. Is the intersection closest to the intersection of the line segment and the side of the virtual regular polygon that are evenly positioned around the center in the plane.

  In the illumination device according to the first to third aspects of the present invention, it is preferable that the holding member has a regular polygonal columnar outer peripheral surface. It is preferable to be disposed on the outer peripheral surface of the holding member.

  In the illumination device according to the first to third aspects of the present invention, the device body surrounds the central axis and the top and bottom plate portions disposed so as to intersect the central axis. It is preferable to have the surrounding wall part arrange | positioned so. In that case, it is preferable that an illumination window part for irradiating the light emitted from the plurality of light sources toward the outside of the apparatus main body is provided on the bottom plate part, and the plurality of light sources It is preferable that a reflection part that guides the illumination window part by reflecting at least a part of the light emitted from is provided on the top plate part and the peripheral wall part.

  ADVANTAGE OF THE INVENTION According to this invention, it can be set as the illuminating device which can manufacture easily and can suppress generation | occurrence | production of illumination intensity nonuniformity reliably.

When one LED is arranged on a side of a virtual regular polygon, it is a diagram for deriving a method of calculating illuminance at an arbitrary point in a plane including the virtual regular polygon. When one LED is arranged on the side of the virtual regular polygon, the maximum illuminance is obtained among the points equidistant from the center of the virtual regular polygon in the plane including the virtual regular polygon. It is a figure which shows a point. It is a figure which shows a specific example of the optimal arrangement position of LED. It is a figure which shows another specific example of the optimal arrangement position of LED. It is a figure which shows an example of the concrete conditions of the numerical analysis performed when determining the optimal arrangement | positioning position of LED, and the attachment range accept | permitted with respect to the said arrangement | positioning position. It is a graph which shows the result of the numerical analysis of the illumination intensity distribution performed based on the conditions shown in FIG. It is a graph which shows the result of the numerical analysis of the illumination intensity distribution performed based on the conditions shown in FIG. It is a graph which shows the result of the numerical analysis of the illumination intensity distribution performed based on the conditions shown in FIG. It is a graph which shows the result of the numerical analysis of the illumination intensity distribution performed based on the conditions shown in FIG. It is a graph which shows the result of the numerical analysis of the illumination intensity distribution performed based on the conditions shown in FIG. It is a figure which shows another example of the specific conditions of the numerical analysis performed when determining the optimal arrangement position of LED, and the attachment range accept | permitted with respect to the said arrangement position. It is a graph which shows the result of the numerical analysis of the illumination distribution performed based on the conditions shown in FIG. It is a graph which shows the result of the numerical analysis of the illumination distribution performed based on the conditions shown in FIG. It is a graph which shows the result of the numerical analysis of the illumination distribution performed based on the conditions shown in FIG. It is a graph which shows the result of the numerical analysis of the illumination distribution performed based on the conditions shown in FIG. It is a graph which shows the result of the numerical analysis of the illumination distribution performed based on the conditions shown in FIG. It is a schematic perspective view of the illuminating device in embodiment of this invention. It is a schematic perspective view which shows the state which removed the translucent cover of the illuminating device in embodiment of this invention. It is a bottom view which shows the state which removed the translucent cover of the illuminating device in embodiment of this invention. It is a partially broken sectional view of the illuminating device in embodiment of this invention. It is a schematic perspective view of the LED mounting board | substrate with which the illuminating device in embodiment of this invention was equipped. It is a principal part expanded sectional view which shows the arrangement position of LED of the illuminating device in embodiment of this invention. It is a schematic perspective view of the LED mounting substrate comprised in the illuminating device which concerns on a 1st modification. It is a schematic perspective view of the LED mounting substrate comprised in the illuminating device which concerns on a 2nd modification.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following, prior to specific description of the illumination device according to the embodiment of the present invention, first, a method for determining the optimal LED arrangement position for reducing illuminance unevenness, and a specific case in accordance with the determination method. An example of a typical LED arrangement, and the conditions and results of numerical analysis performed when determining the allowable mounting range for the optimum LED arrangement position will be described.

  FIG. 1 is a diagram for deriving a method for calculating illuminance at an arbitrary point in a plane including a virtual regular polygon when one LED is arranged on the side of the virtual regular polygon. 2 is a diagram illustrating a point having the maximum illuminance among points that are equidistant from the center of the virtual regular polygon in a plane including the virtual regular polygon.

  In the lighting device, when a plurality of LEDs are arranged on a side of a virtual regular polygon centered on a point where the plane and the central axis intersect in a plane orthogonal to the central axis of the apparatus body, The illuminance at a point outside the virtual regular polygon in the plane and at an equal distance from the center is important. That is, since variation occurs in illuminance at a point where the distance from the center is the same distance, this becomes uneven and the uniformity of light is impaired. Therefore, it is preferable to suppress the variation as much as possible. .

As shown in FIG. 1, a circle 300 whose distance from the center O of the virtual regular polygon 200 is R (here, the circle 300 is limited to the outside of the virtual regular polygon 200) is assumed. When an LED is arranged at an arbitrary point P between adjacent vertices X ₁ and X _{2 of} the virtual regular polygon 200 (here, the angle YOP = θ ₁ ), the light emitted from the LED Consider the illuminance E at an arbitrary point A on the circle 300. The point Y shown in the figure is the midpoint between the _two vertices X ₁ and X ₂ of the virtual regular polygon 200, and the LED has an optical axis 500 that is the side of the virtual regular polygon 200. It shall be arranged so that it may intersect perpendicularly and the emitting direction may face the outside.

The illuminance characteristics of many wide-angle LEDs are proportional to the cosine of the angle from the front and inversely proportional to the square of the distance with respect to the illuminance at the reference distance along the optical axis direction. Generally, it is represented by the following formula (1). Here, I is the luminous intensity of the LED, and θ ₂ is the angle formed by the optical axis 500 and the line segment AP. AP is the length of the line segment AP.
E = (I × cos θ ₂ ) / (AP × AP) (1)

Further, assuming that the point Q of the perpendicular line extending from the point A to the side including the point P of the virtual regular polygon 200 is the point Q, the following equation (2) is established. AQ is the length of the line segment AQ.
cos θ ₂ = AQ / AP (2)

Therefore, by substituting the above equation (2) into the above equation (1), the above equation (1) is expressed as the following equation (3). However, AQ ≧ 0.
E = (I × AQ) / (AP × AP × AP) (3)

Based on the above equation (3), the illuminance E becomes 0 when AQ = 0, and therefore, the point where AQ = 0, that is, the extension line of the side including the point P of the virtual regular polygon 200 and the circle 300 When the point A is located at the intersections Z ₁ and Z ₂ with the illuminance E, the illuminance E becomes zero. Therefore, when the angle YOA is Θ, the case where Θ is in the following equation (4) is the domain of definition.
arccos (OY / OZ ₁ ) <Θ <arccos (OY / OZ ₂ ) (4)

Further, based on the above formula (3) and the above formula (4), AP and AQ both take positive values in the definition area, so that the illuminance E is the maximum value when θ ₂ takes a value near 0. It becomes. At that time, since cos θ ₂ = 1, the illuminance E may be regarded as the maximum value when the AP takes the minimum value. That is, as shown in FIG. 2, when Θ = arcos (OY / OP) where the line segment OA overlaps the line segment OP (that is, when Θ = θ ₁ ), the illuminance E becomes E _max = I / (AP × AP).

By making the points where the illuminance E becomes the maximum value E _max appear evenly on the circumference of the circle 300, it is considered that an illuminating device with less illuminance unevenness can be realized. Therefore, when a line segment for which the circumference of the circle 300 is equivalent to the total number of LEDs to be arranged on the side of the virtual regular polygon 200 is drawn radially from the center O, the drawn line segment and the above It is presumed that the occurrence of uneven illuminance can be suppressed by arranging the LEDs at the intersections with the sides of the virtual regular polygon 200.

  Here, in order to further suppress the illuminance unevenness, it is preferable that the LEDs arranged on each side of the virtual regular polygon 200 are arranged at positions symmetrical with respect to the line segment OY. The circle 300 is similar to the circumscribed circle of the virtual regular polygon 200.

Therefore, when these are generalized in consideration of the above, the optimum arrangement position of the plurality of LEDs for suppressing the occurrence of uneven illuminance is partially a vertex X ₁ , X _{2 of the} virtual regular polygon 200. ,... Are drawn radially from the center O so as to divide the circumference of the circumscribed circle of the virtual regular polygon 200 equally by twice the total number of the plurality of LEDs. In this case, the center of the line in the plane on which the plurality of LEDs are arranged with the line segment passing through one vertex of the virtual regular polygon 200 among the plurality of drawn line segments as a reference. This is the intersection of the line segment that is evenly positioned around O and the side of the virtual regular polygon 200. However, it is assumed that two or more LEDs are arranged in the same number on each side of the virtual regular polygon 200.

  3 and 4 are diagrams showing a specific example and another example of the optimum arrangement position of the LED.

As shown in FIG. 3, when a total of 16 LEDs are arranged linearly along the circumferential direction on the outer peripheral surface of the holding frame having a regular octagonal outer peripheral surface, The square 200 becomes a regular octagon, and two LEDs are arranged on each side. In that case, a total of 16 LEDs are arranged at the positions of P ₁ , P ₂ , P ₃ , P ₄ ,.

  Here, an angle α formed by a pair of line segments connecting the respective points where adjacent LEDs are located and the center O is α = 360 ° / 16 = 22.5 °, and the apex of the regular octagon and An angle α / 2 formed by a pair of line segments connecting points where one adjacent LED is located is α / 2 = 22.5 ° / 2 = 11.25 °. Reference numeral 400 shown in the figure is a regular octagon circumscribed circle as the virtual regular polygon 200.

Also, as shown in FIG. 4, when a total of 24 LEDs are arranged in a line along the circumferential direction on the outer peripheral surface of the holding frame having a regular octagonal outer peripheral surface, The regular polygon 200 becomes a regular octagon, and three LEDs are arranged on each side. In that case, a total of 24 LEDs are arranged at the positions P ₁ , P ₂ , P ₃ , P ₄ , P ₅ , P ₆ ,.

  Here, an angle α formed by a pair of line segments connecting the respective points where adjacent LEDs are located and the center O is α = 360 ° / 24 = 15 °, and the apex of the regular octagon is adjacent to this. An angle α / 2 formed by a pair of line segments connecting a point where one LED is located is α / 2 = 15 ° / 2 = 7.5 °. Reference numeral 400 shown in the figure is a regular octagon circumscribed circle as the virtual regular polygon 200.

Thus, by arranging the LEDs according to the rules described above, the point where the illuminance E becomes the maximum value E _max is on the circumference of the circle 300 where the distance from the center O of the virtual regular polygon 200 is the same distance. Therefore, it is possible to realize an illumination device with little illuminance unevenness. When LEDs are arranged according to the rules described above, the LED arrangement pitch in the vicinity of the corners of the regular polygon 200 is larger than the LED arrangement pitch in the central portion located between the corners. Become.

  FIG. 5 is a diagram showing an example of specific conditions of numerical analysis performed when determining the optimum arrangement position of the LED and the attachment range allowable for the arrangement position, and FIGS. It is a graph which shows the result of the numerical analysis of the illumination intensity distribution performed based on the conditions shown in FIG.

As shown in FIG. 5, in this numerical analysis, a plurality of LEDs are arranged according to the above rule, two on each side of a regular octagon as a virtual regular polygon 200 (that is, α = 22.5 °). ), The distance between the apex of the regular octagon and the center O (typically, the length of the line segment OX ₁ ) is 240 mm, within the plane where the LEDs are arranged, and from the center O The illuminance distribution on the circumference of a circle 300 having a distance R of 240 mm, 250 mm, 270 mm, 300 mm, 320 mm, and 350 mm was calculated.

Also, in consideration of setting an allowable mounting range for the optimum LED placement position, the line segment OY (Y is the midpoint between the vertices X ₁ and X ₂ ) is used as a reference, and the LED The center angle β shown in the figure from the optimum arrangement position (that is, the position of α / 2 = 11.25 °) is β = 0.4α, 0.45α, 0.55α, 0. Assuming the case where the position is shifted to 6α, the illuminance distribution was calculated under the above conditions.

  FIG. 6 shows a numerical analysis result when the LED is arranged at an optimum arrangement position under the above conditions (that is, when β = 0.5α). FIG. 7 shows the numerical analysis result when the LED is arranged at a position where β = 0.4α under the above-mentioned conditions. FIG. 8 shows the LED at a position where β = 0.45α. The numerical analysis result when arranged is shown. Further, FIG. 9 shows a numerical analysis result when the LED is arranged at a position where β = 0.55α, and FIG. 10 shows a case where the LED is arranged at a position where β = 0.6α. Numerical analysis results are shown.

  Referring to FIG. 6, when the LED is arranged at the optimum arrangement position (that is, when β = 0.5α), R = 240 mm, 250 mm, 270 mm, 300 mm, 320 mm, 350 mm of circle 300 It is confirmed that the points with the maximum illuminance on the circumference appear at substantially equal positions along the circumferential direction, and the points with the maximum illuminance and the points with the minimum illuminance on the circumference of each circle 300, It was confirmed that the difference between the two was suppressed small.

  8 and 9, when β = 0.45α and 0.55α, the above-described LED is arranged at the optimum arrangement position (that is, β = 0.5α). It is confirmed that the maximum illuminance point on the circumference of the circle 300 with R = 240 mm, 250 mm, 270 mm, 300 mm, 320 mm, and 350 mm slightly deviates along the circumferential direction. It was confirmed that the difference between the point with the maximum illuminance and the point with the minimum illuminance on the circumference of 300 was slightly increased.

  On the other hand, referring to FIGS. 7 and 10, in the case of β = 0.4α, 0.6α, the above-described LED is arranged at the optimum arrangement position (that is, β = 0.5α). Compared to the above, it is confirmed that the point of maximum illuminance on the circumference of the circle 300 with R = 240 mm, 250 mm, 270 mm, 300 mm, 320 mm, 350 mm is unacceptably large and deviates along the circumferential direction. It was confirmed that the difference between the maximum illuminance point and the minimum illuminance point on the circumference of each circle 300 was unacceptably large.

  FIG. 11 is a diagram showing an example of other specific conditions of the numerical analysis performed when determining the optimum arrangement position of the LED and the attachment range allowable for the arrangement position. These are graphs showing the results of numerical analysis of the illuminance distribution performed based on the conditions shown in FIG.

As shown in FIG. 11, in this numerical analysis, a case where a plurality of LEDs are arranged in accordance with the above rule on each side of a regular hexagon as a virtual regular polygon 200 (that is, α = 30 °). assumed, the distance between the vertex and the center O of the regular hexagon (typically, the line segment length of OX ₁₎ was used as a 240 mm, the distance a plane LED is located from the center O The illuminance distribution on the circumference of a circle 300 where R is 240 mm, 250 mm, 270 mm, 300 mm, 320 mm, and 350 mm was calculated.

Also, in consideration of setting an allowable mounting range for the optimum LED placement position, the line segment OY (Y is the midpoint between the vertices X ₁ and X ₂ ) is used as a reference, and the LED The center angle β shown in the figure from the optimum arrangement position (that is, the position of α / 2 = 15 °) from the optimum arrangement position is β = 0.4α, 0.45α, 0.55α, 0.6α. The illuminance distribution was calculated under the above conditions for these cases.

  FIG. 12 shows a numerical analysis result when the LED is arranged at an optimum position under the above conditions (that is, when β = 0.5α). FIG. 13 shows the numerical analysis result when the LED is arranged at a position where β = 0.4α under the above-mentioned conditions, and FIG. 14 shows the LED at a position where β = 0.45α. The numerical analysis result when arranged is shown. Further, FIG. 15 shows the numerical analysis result when the LED is arranged at a position where β = 0.55α, and FIG. 16 shows the case where the LED is arranged at a position where β = 0.6α. Numerical analysis results are shown.

  Referring to FIG. 12, when the LED is arranged at an optimum position (that is, when β = 0.5α), a circle 300 of R = 240 mm, 250 mm, 270 mm, 300 mm, 320 mm, and 350 mm. It is confirmed that the points with the maximum illuminance on the circumference appear at substantially equal positions along the circumferential direction, and the points with the maximum illuminance and the points with the minimum illuminance on the circumference of each circle 300 are confirmed. It was confirmed that the difference between them was suppressed small.

  14 and 15, in the case of β = 0.45α and 0.55α, the above-described LED is arranged at the optimum position (that is, when β = 0.5α). In comparison, it is confirmed that the point having the maximum illuminance on the circumference of the circle 300 with R = 240 mm, 250 mm, 270 mm, 300 mm, 320 mm, and 350 mm is slightly shifted along the circumferential direction. It was confirmed that the difference between the point with the maximum illuminance and the point with the minimum illuminance on the circumference was slightly increased.

  On the other hand, referring to FIGS. 13 and 16, in the case of β = 0.4α, 0.6α, the above-described LED is arranged at the optimum position (that is, when β = 0.5α). In comparison, it is confirmed that the point of maximum illumination on the circumference of the circle 300 where R = 240 mm, 250 mm, 270 mm, 300 mm, 320 mm, and 350 mm is unacceptably large and deviates along the circumferential direction. It was confirmed that the difference between the maximum illuminance point and the minimum illuminance point on the circumference of the circle 300 is unacceptably large.

  Based on the above results, not only when the LED is arranged at the optimum arrangement position according to the above-described rules, but also in the vicinity of the optimum arrangement position (that is, the virtual regular polygon 200 with respect to the optimum arrangement position). Even when the LED is arranged on the side of the virtual regular polygon 200 within an angle range of ± 10% of the central angle with respect to the center O of the light source, it is possible to sufficiently suppress the occurrence of illuminance unevenness Can be judged. Therefore, when it is necessary to arrange other electronic components or the like in the optimum arrangement position of the LED or in the vicinity thereof, and the LED cannot be arranged in the optimum arrangement position in accordance with the rules described above, the optimum arrangement described above is used. The LED may be arranged in the vicinity of the position (that is, on the side of the virtual regular polygon 200 within the angle range described above).

  FIG. 17 is a schematic perspective view of the illumination device according to the embodiment of the present invention. 18 is a schematic perspective view showing a state in which the light-transmitting cover of the lighting apparatus shown in FIG. 17 is removed, and FIG. 19 is a bottom view in this state. 20 is a partially cutaway cross-sectional view of the lighting device shown in FIG. 17, and FIG. 21 is a schematic perspective view of an LED mounting board provided in the lighting device.

  As shown in FIGS. 17 and 20, the illuminating device 1 according to the present embodiment includes a device body 2 having a flat and substantially cylindrical outer shape. The illuminating device 1 is installed on the indoor ceiling surface 1000 (see FIG. 20) via a fixture (not shown), thereby irradiating illumination light toward the indoor floor surface, thereby being used for indoor illumination. Is.

  The apparatus main body 2 has a top plate portion and a bottom plate portion arranged so as to intersect with the central axis 100, and a peripheral wall portion arranged so as to surround the central axis 100.

  Specifically, as shown in FIGS. 17 to 20, the apparatus main body 2 covers a flat bottomed and substantially cylindrical chassis 10 whose bottom surface is open, and an inner bottom surface and an inner peripheral surface of the chassis 10. A flat dome-shaped reflecting plate 11 disposed, a flat, substantially disk-shaped light-transmitting cover 12 disposed so as to cover the opened lower surface of the chassis 10, and the vicinity of the center of the light-transmitting cover 12 And a decorative cover 13 disposed so as to cover the cover. The decorative cover 13 is for blinding the substantially central portion of the apparatus main body 2.

  Here, the top plate portion and the peripheral wall portion of the device main body 2 described above are mainly configured by the chassis 10 and the reflection plate 11, and the bottom plate portion of the device main body 2 described above is configured by the translucent cover 12 and the decorative cover 13. Has been.

  As shown in FIGS. 18 and 19, a holding frame 20 having a regular octagonal outer peripheral surface is provided at the center inside the apparatus main body 2. The holding frame 20 has a hollow shape, and is arranged so that its axis coincides with the central axis 100 of the apparatus main body 2. Note that the upper end of the holding frame 20 is fixed to the top plate portion of the apparatus main body 2.

  LED mounting boards 30 on which LEDs 31 are mounted are respectively provided on the outer surfaces of the eight planar shapes constituting the outer peripheral surface of the holding frame 20.

  As shown in FIG. 21, the LED mounting substrate 30 is made of a rectangular substrate having a flat plate shape in plan view, and a plurality of LEDs 31 are linearly mounted on the main surface thereof.

  As shown in FIGS. 18 to 20, the LED mounting substrate 30 described above is positioned on each of the planar outer surfaces of the holding frame 20 so that the longitudinal direction thereof is along the circumferential direction of the outer peripheral surface of the holding frame 20. Thus, the plurality of LEDs 31 are arranged linearly along the circumferential direction on the outer peripheral surface of the holding frame 20. The holding frame 20 and the LED mounting substrate 30 described above correspond to a holding member that holds the plurality of LEDs 31.

  The hollow internal space of the holding frame 20 accommodates a power supply board (not shown) provided with a power supply circuit for supplying power for causing the LEDs to emit light. Note that the power supply to the power supply circuit is performed by connecting the power supply circuit to an external commercial power supply or the like via the wiring provided in the above-described fixture (not shown).

  As shown in FIG. 20, the bottom plate portion of the apparatus body 2 is provided with an illumination window portion for irradiating light emitted from the LEDs 31 mounted on the LED mounting substrate 30 into the room. The illumination window portion is mainly configured by an opening located on the lower surface of the chassis 10 and a translucent cover 12 disposed so as to close the opening.

  As shown in FIG. 20, in the illumination device 1 having the above-described configuration, a plurality of LEDs 31 are arranged in the central portion of the device body 2 so as to face the radially outer side, and from the plurality of LEDs 31 toward the radially outer side. Most of the light to be emitted radially is reflected by the reflecting plate 11 and irradiated into the room through the above-described illumination window. Thereby, the occurrence of glare is suppressed, and the thickness of the apparatus main body 2 can be reduced, so that the illumination apparatus can be excellent in terms of function and design.

  In the lighting device 1 having the above-described configuration, the outer peripheral surface of the holding frame 20 is formed in a regular octagonal column shape that approximates a columnar shape, so that the mounting surface of the LED mounting substrate 30 has a planar shape and the LED 31 with high accuracy. Is possible.

  Here, in the illuminating device 1 in this Embodiment, several LED31 arrange | positioned in the center part of the apparatus main body 2 is arrange | positioned in the optimal arrangement | positioning position in order to suppress illumination intensity nonuniformity according to the rule mentioned above. As a result, the occurrence of uneven illuminance is reliably suppressed.

  FIG. 22 is an enlarged cross-sectional view of the main part showing the arrangement position of the LEDs of the illumination device in the present embodiment.

  As shown in FIG. 22, in the lighting device 1 according to the present embodiment, on the outer surface of the eight planar shapes constituting the outer peripheral surface of the holding frame 20 having the above-described regular octagonal outer peripheral surface, LED mounting boards 30 on which six LEDs 31 are mounted in a line are fixed. In this case, since the virtual regular polygon 200 is a regular octagon and six LEDs are arranged on each side, the holding frame 20 is provided with 48 LEDs 31 in total.

  Here, an angle α formed by a pair of line segments connecting each point where the adjacent LEDs 31 are located and the center O of the regular octagon is α = 360 ° / 48 = 7.5 °, and the apex of the regular octagon and An angle α / 2 formed by a pair of line segments connecting the points where one of the adjacent LEDs 31 is located is α / 2 = 7.5 ° / 2 = 3.75 °. Reference numeral 400 shown in the figure is a regular octagon circumscribed circle as the virtual regular polygon 200.

  Based on the above, the distance L1 from the one end of the LED mounting board 30 of the LED 31 arranged at the position closest to the one end in the longitudinal direction of the LED mounting board 30 and the arrangement of the six LEDs 31 arranged in a line. The distances L7 from the other end of the LED mounting substrate 30 of the LED 31 disposed in the position closest to the pitch L2 to L6 and the other end in the longitudinal direction of the LED mounting substrate 30 are determined in advance. Based on the arrangement pitches L2 to L6, as shown in FIG. 21, six LED 31 are mounted on the LED mounting substrate 30 in advance, whereby the LED mounting substrate 30 on which the six LEDs 31 are mounted is positioned and the holding frame 20 is positioned. As a result, the optimum arrangement position of the LED 31 described above is realized.

  As described above, by using the lighting device 1 in the present embodiment, the manufacture becomes easy and the occurrence of uneven illuminance can be surely suppressed, and the light is uniform in all directions irradiated with light. Therefore, the lighting device can be manufactured at a low cost with ensured properties.

  FIG. 23 and FIG. 24 are schematic perspective views of the LED mounting substrate provided in the illumination device according to the first and second modifications.

  In general, in an illumination device that illuminates a room, in addition to an illumination function, a dimming function is often provided. The dimming function is to give the user a sense of life and a psychological effect by giving different colors to the illumination light emitted from the illumination device. In order to realize the dimming function, it is common to provide an illuminating device with LEDs that emit light of different colors, and adjust the output to give different colors to the illumination light.

  Here, since the lighting device for home use does not require a significant color change as a dimming function, the first light source that normally emits white light as a basic color is used. And a color mixing LED as a second light source that emits light of a color different from that of white light is used. In general, the total number of toning LEDs is reduced compared to the total number of basic color LEDs.

  Even in an illumination device including such basic color LEDs and toning LEDs, it is important to ensure the uniformity of light in all directions irradiated with light, and to suppress the occurrence of the illuminance unevenness described above. Not only is it necessary, but it is also necessary to suppress the occurrence of color unevenness.

  Here, in the lighting device according to the first modified example, in order to suppress the occurrence of the illuminance unevenness and the color unevenness described above, the basic color LED and the toning LED are separately provided on the holding frame according to the rules described above. In the illuminating device according to the second modified example, the basic color LED and the toning LED are roughly grouped in order to suppress the above-described illuminance unevenness and color unevenness. According to the rule, it is arranged on the holding frame.

  As shown in FIG. 23, in the lighting device according to the first modification, a plurality of basic color LEDs 31A and a plurality of toning LEDs 31B are arranged on the main surface of the LED mounting substrate 30, and the toning LEDs 31B The total number is smaller than the total number of basic color LEDs 31A.

  Here, each of the plurality of basic color LEDs 31A has a circumscribed circle of the virtual regular polygon so that a part thereof passes through each vertex of the virtual regular polygon on which the plurality of basic color LEDs 31A are arranged. When a line segment that equally divides the circumference by two times the total number of the plurality of basic color LEDs 31A is drawn radially from the center of the virtual regular polygon, the above-described line segment is drawn. With the line segment passing through one vertex of the virtual regular polygon as a reference, this is the first line segment that is positioned evenly around the center in the plane on which the plurality of basic color LEDs 31A are arranged. They are arranged at or near the intersection with the side of the virtual regular polygon.

  On the other hand, each of the plurality of toning LEDs 31B is a circumscribed circle of the virtual regular polygon so that a part thereof passes through each vertex of the virtual regular polygon on which the plurality of toning LEDs 31B are arranged. When a line segment that equally divides the circumference by twice the total number of the plurality of toning LEDs 31B is drawn radially from the center of the virtual regular polygon, the virtual line of the drawn line segments is drawn. A line segment that passes through one vertex of the regular polygon is defined as the first line segment, and the line segment that is even-numbered around the center in the plane on which the plurality of toning LEDs 31B are arranged, and the above-described line segment It is arranged at or near the intersection with the side of the virtual regular polygon.

  By configuring in this way, for any of the plurality of basic color LEDs 31A and the plurality of toning LEDs 31B, these are arranged at the optimal arrangement position for suppressing the occurrence of illuminance unevenness and color unevenness, It becomes possible to ensure the uniformity of light in all directions irradiated with light. The LED arrangement method shown in the first modification has a relatively small total number of basic color LEDs 31A, so that a relatively large arrangement pitch between the basic color LEDs 31A can be ensured. This arrangement method is particularly suitable when the LED 31A can be arranged at an optimum arrangement position without physically interfering with the LED 31A.

  As shown in FIG. 24, in the illumination device according to the second modification, a plurality of basic color LEDs 31A and a plurality of toning LEDs 31B are arranged on the main surface of the LED mounting substrate 30, and the toning LEDs 31B The total number is smaller than the total number of basic color LEDs 31A.

  Here, the plurality of basic color LEDs 31A and the plurality of toning LEDs 31B pass through the vertices of a virtual regular polygon where the plurality of basic color LEDs 31A and the plurality of toning LEDs 31B are arranged, A line segment that equally divides the circumference of the circumscribed circle of the virtual regular polygon by the number twice the sum of the total number of the plurality of basic color LEDs 31A and the total number of the plurality of toned LEDs 31B is the virtual regular polygon. When the image is drawn radially from the center of the line, the plurality of basic color LEDs 31A are based on a line segment passing through one vertex of the virtual regular polygon among the plurality of line segments drawn. One of them is arranged at or near the intersection of a line segment that is evenly positioned around the center and the side of the virtual regular polygon in the arranged plane.

  A plurality of toning LEDs 31B are respectively arranged at or near a predetermined intersection of the intersections or the vicinity thereof where any of the plurality of basic color LEDs 31A and the plurality of toning LEDs 31B are arranged. A plurality of basic color LEDs 31 </ b> A are respectively disposed at the remaining intersection or the vicinity thereof in the intersection where the color LED 31 </ b> A and the plurality of toning LEDs 31 </ b> B are disposed. The predetermined intersection point is the circumference of the circumscribed circle of the virtual regular polygon so that a part thereof passes through each vertex of the virtual regular polygon on which the plurality of toning LEDs 31B are arranged. When a line segment equally divided by a number twice the total number of the plurality of toning LEDs 31B is drawn radially from the center of the virtual regular polygon, the virtual regularity among the drawn line segments is drawn. With a line segment passing through one vertex of the square as a reference, the line segment that is evenly positioned around the center in the plane on which the plurality of toning LEDs 31B are arranged and the virtual positive line This is the intersection closest to the intersection with the side of the polygon.

  By configuring in this way, any of the plurality of basic color LEDs 31A and the plurality of toning LEDs 31B is approximately arranged at an optimal arrangement position for suppressing the occurrence of illuminance unevenness and color unevenness. It becomes possible to ensure the uniformity of light in all directions irradiated with light. In addition, the LED arrangement method shown in the second modification example has a relatively large total number of basic color LEDs 31A, so that the arrangement pitch between the basic color LEDs 31A becomes relatively small. This arrangement method is particularly suitable when it is difficult to arrange the color LED 31A at an optimum arrangement position without physically interfering with the color LED 31A.

  In the above-described embodiment of the present invention and its modified examples, the case where the present invention is applied to an illumination device including an LED as a light source has been described as an example. However, the light source is limited to the LED. However, the present invention can be applied to a lighting device equipped with any light source as long as the light source has a predetermined directivity in the irradiance distribution.

  Further, in the above-described embodiment of the present invention and the modification thereof, the description has been given by exemplifying the case where the regular regular polygon in which the LED as the light source is arranged is mainly a regular octagon or a regular hexagon. The present invention can be applied to other regular shapes as long as they are regular polygons. Furthermore, the number of LEDs as the light source, the shape of the holding frame as the holding member, the LED mounting substrate, and the like are not limited to those shown in the above-described embodiment of the present invention and its modifications.

  As described above, the above-described embodiment and its modifications disclosed herein are illustrative in all respects and are not restrictive. The technical scope of the present invention is defined by the terms of the claims, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  DESCRIPTION OF SYMBOLS 1 Illuminating device, 2 apparatus main body, 10 chassis, 11 reflector, 12 translucent cover, 13 decorative cover, 20 holding frame, 30 LED mounting board, 31 LED, 31A basic color LED, 31B toning LED, 100 central axis, 200 Virtual regular polygon, 300 yen, 400 circumscribed circle, 500 optical axis, 1000 ceiling.

Claims (5)

A plurality of light sources arranged in a plane perpendicular to the central axis of the apparatus body;
A lighting device comprising a holding member for holding the plurality of light sources,
The holding member is provided at a central portion of the apparatus main body,
The plurality of light sources are held by the holding member, so that two or more and the same number are provided on each side of a virtual regular polygon centered on a point where the plane and the central axis intersect. Are arranged such that their respective optical axes are orthogonal to the sides of the virtual regular polygon and the emission direction faces outward.
A line segment that equally divides the circumference of the circumscribed circle of the virtual regular polygon by twice the total number of the plurality of light sources so that a part thereof passes through each vertex of the virtual regular polygon. When drawn radially from the center, the first line segment passing through one vertex of the virtual regular polygon of the drawn line segments is taken as the first, and this is the center around the center in the plane. The plurality of light sources are respectively arranged at or near the intersections between the line segments that are evenly located and the sides of the virtual regular polygon. A plurality of light sources arranged in a plane perpendicular to the central axis of the apparatus body;
A lighting device comprising a holding member for holding the plurality of light sources,
The plurality of light sources include a plurality of first light sources that respectively emit light of a first color, and a plurality of second light sources that respectively emit light of a second color different from the first color. Including
The total number of the plurality of second light sources is less than the total number of the plurality of first light sources,
The holding member is provided at a central portion of the apparatus main body,
The plurality of first light sources are held by the holding member, so that two or more of the first light sources are provided on each side of a virtual regular polygon centered on a point where the plane and the central axis intersect each other. And the same number of the optical axes are arranged so that their respective optical axes are orthogonal to the sides of the virtual regular polygon and the emission direction thereof faces outward,
The plurality of second light sources are held by the holding member, so that the same number is arranged for each side at a position on the side of the virtual regular polygon, and each optical axis thereof is the virtual regular poly It is arranged so that it is orthogonal to the sides of the square and its emission direction faces the outside,
A line segment that equally divides the circumference of the circumscribed circle of the virtual regular polygon by twice the total number of the first light sources so that a part thereof passes through each vertex of the virtual regular polygon. When drawn radially from the center, the first line segment passing through one vertex of the virtual regular polygon of the drawn line segments is taken as the first, and this is the center around the center in the plane. The plurality of first light sources are respectively arranged at or near the intersections of the line segments and the sides of the virtual regular polygons, which are even-numbered.
A line that equally divides the circumference of the circumscribed circle of the virtual regular polygon by twice the total number of the plurality of second light sources so that a part thereof passes through each vertex of the virtual regular polygon When a segment is drawn radially from the center, the line segment passing through one vertex of the virtual regular polygon among the plurality of drawn line segments is defined as the first in the plane with respect to the line segment passing through one vertex of the virtual regular polygon. The illuminating device, wherein the plurality of second light sources are respectively arranged at or near an intersection of a line segment that is positioned evenly around the center and a side of the virtual regular polygon. A plurality of light sources arranged in a plane perpendicular to the central axis of the apparatus body;
A lighting device comprising a holding member for holding the plurality of light sources,
The plurality of light sources include a plurality of first light sources that respectively emit light of a first color, and a plurality of second light sources that respectively emit light of a second color different from the first color. Including
The total number of the plurality of second light sources is less than the total number of the plurality of first light sources,
The holding member is provided at a central portion of the apparatus main body,
The plurality of first light sources are held by the holding member, so that two or more of the first light sources are provided on each side of a virtual regular polygon centered on a point where the plane and the central axis intersect each other. And the same number of the optical axes are arranged so that their respective optical axes are orthogonal to the sides of the virtual regular polygon and the emission direction thereof faces outward,
The plurality of second light sources are held by the holding member, so that the same number is arranged for each side at a position on the side of the virtual regular polygon, and each optical axis thereof is the virtual regular poly It is arranged so that it is orthogonal to the sides of the square and its emission direction faces the outside,
The circumference of the circumscribed circle of the virtual regular polygon is the total number of the plurality of first light sources and the total number of the plurality of second light sources so that a part thereof passes through each vertex of the virtual regular polygon. When a line segment equally divided by twice the sum of the lines is drawn radially from the center, a line segment passing through one vertex of the virtual regular polygon among the drawn line segments The first light source and the plurality of the first light sources and the intersection thereof between the line segment that is evenly positioned around the center and the side of the virtual regular polygon in the plane with the first as a reference Each of the plurality of second light sources is arranged,
The plurality of second light sources are respectively disposed at or near a predetermined intersection of the intersections or the vicinity thereof where any of the plurality of first light sources and the plurality of second light sources are disposed,
The plurality of first light sources are respectively disposed at or at the remaining intersection of the intersection where the plurality of first light sources and the plurality of second light sources are disposed, or the vicinity thereof.
The predetermined intersection point has a circumference of the circumscribed circle of the virtual regular polygon that is twice the total number of the plurality of second light sources so that a part thereof passes through each vertex of the virtual regular polygon. When a line segment equally divided by a number is drawn radially from the center, the line segment that passes through one vertex of the virtual regular polygon among the plurality of drawn line segments is referred to as the first. As an illuminating device, which is an intersection point closest to the intersection point between a line segment that is even-numbered around the center and the side of the virtual regular polygon in the plane. The holding member has a regular polygonal columnar outer peripheral surface,
The lighting device according to claim 1, wherein the plurality of light sources are disposed on the outer peripheral surface of the holding member. The apparatus main body includes a top plate portion and a bottom plate portion disposed so as to intersect the central axis, and a peripheral wall portion disposed so as to surround the central axis,
The bottom plate part is provided with an illumination window part for irradiating the light emitted from the plurality of light sources toward the outside of the apparatus main body,
5. The reflecting portion for guiding the light to the illumination window portion by reflecting at least a part of the light emitted from the plurality of light sources is provided on the top plate portion and the peripheral wall portion. The illuminating device in any one of.

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