JP5425289B1 - Lighting device - Google Patents

Abstract

An illumination device including a light emitting diode that emits light downward and a light distribution lens that distributes light from the light emitting diode can illuminate a wide lower range uniformly and brightly. Is an issue.
The present invention includes a plurality of irradiation units including a light emitting diode that emits light downward and a light distribution lens that distributes light from the light emitting diode, and at least one of the irradiation units. First, in the illuminating device that becomes the wide area irradiation units 7A, 7B, and 7D that intensify the light from the light emitting diode 8 in the direction intersecting the optical axis S by the light distribution lens 9, the wide area irradiation units 7A, 7A, At least one other than 7B and 7D is a downward irradiation unit 7C that intensifies the light from the light emitting diode 8 along the optical axis S direction by the light distribution lens 9.
[Selection] Figure 1

Description

  The present invention relates to a lighting device that brightly illuminates a space such as a parking lot or a room.

  A plurality of irradiation units each including a light emitting diode that emits light downward and a light distribution lens that distributes light from the light emitting diode, and at least one of the irradiation units is configured to emit light from the light emitting diode by the light distribution lens. The illumination device shown in Patent Document 1 is known as a wide area irradiation unit that strengthens the light beam in the direction intersecting the optical axis.

JP 2010-170736 A

  The illumination device shown in the above document can illuminate a wide range below the irradiation unit by setting the irradiation direction in a direction close to the horizontal direction. There may be a case where the portion directly below the irradiation unit on the side becomes dark and the entire lower space cannot be illuminated uniformly and brightly.

  The present invention provides an illuminating device including a light emitting diode that emits light downward and a light distribution lens that distributes light from the light emitting diode, and can uniformly illuminate a wide lower range uniformly. This is the issue.

In order to solve the above-mentioned problems, first, there is a lighting device installed at a predetermined height from the ground or floor, which emits light downward, and distributes light from the light emitting diode 8. A plurality of irradiation units 7 each having a light distribution lens 9, the optical axes S of the respective light emitting diodes 8 are directed in the same or substantially the same direction, and at least one irradiation unit 7 is separated from the light emitting diodes 8 by the light distribution lens 9. Are wide-area irradiation units 7A, 7B, and 7D that distribute light over a wide range around the optical axis S by weakening the light on the optical axis S side and strengthening it toward the side that spreads from the optical axis S. At least one irradiation unit 7 other than the irradiation units 7A, 7B and 7D is distributed so that light from the light emitting diode 8 is distributed by the light distribution lens 9 on the optical axis S or in a narrow range close to the optical axis S. By using the formed lower irradiation unit 7C, the lower irradiation unit is placed on or near the optical axis S where the light is weakened by the light distribution of the wide area irradiation units 7A, 7B, and 7C and the light amount is insufficient. It is characterized in that it is compensated by light distribution in the narrow range of 7C.

Second, a plurality of the wide area irradiation units 7A, 7B, and 7D are provided, and the number of the wide area irradiation units 7A, 7B, and 7D is set larger than the number of the lower irradiation units 7C .

Third, the light from the light emitting diode 8 is distributed so that the light distribution lens 9 of the wide area irradiation unit 7D has a circular light amount distribution centered on the optical axis S as viewed in the optical axis S direction. It is characterized in that the configuration and the.

Fourth, the light distribution lens 9 of the wide area irradiation units 7A and 7B distributes the light from the light emitting diode 8 so as to spread on both sides of the light distribution Z1 orthogonal to the optical axis S. Yes.

  According to the above configuration, the wide irradiation unit that intensifies the light from the light emitting diode in the direction intersecting the optical axis and the lower irradiation unit that intensifies the light from the light emitting diode along the optical axis direction. The range can be illuminated uniformly and brightly.

(A), (B) is the top view and front view of a parking lot which installed the illuminating device to which this invention is applied. It is a top view which shows the irradiation range of an illuminating device. It is explanatory drawing which shows the structure of the irradiation surface of an illuminating device. It is explanatory drawing which looked at LED from right beside the optical axis. (A) is drawing which shows the shape at the time of seeing a 1st light distribution lens from an optical axis direction, (B), (C) is the B arrow directional view and C arrow directional view of (A). (A), (B) is the light quantity distribution figure of the 1st irradiation unit seeing in the optical axis direction, and the light quantity distribution figure of a major axis direction. (A) is an external view of the second light distribution lens as viewed in the direction of the optical axis, (B) is a view taken in the direction of arrow B in (A), and (C) is a sectional view taken along the line CC in (A). . It is a light quantity distribution figure of the optical axis direction view of the 2nd irradiation unit. (A) and (B) are the exploded side view and top view of a 3rd irradiation unit. (A) is explanatory drawing at the time of seeing the irradiation state of a 3rd irradiation unit from right side, (B) is a light quantity distribution figure of the optical axis direction view of a 3rd irradiation unit. (A), (B) is the top view and side view of an outdoor lamp installed in the park. (A), (B) is the side view of a 4th light distribution lens, and the top view of an optical axis direction view. (A) is a light amount distribution diagram of the fourth irradiation unit as viewed in the optical axis direction, and (B) is a light amount distribution diagram of the fourth irradiation unit when observed from right next to the optical axis. (A), (B) is the top view and side view of an external lamp installed in the room.

1A and 1B are a plan view and a front view of a parking lot in which an illumination device to which the present invention is applied is installed. The illumination device 3 installed at a predetermined height from the ground 2 of the parking lot (space) 1 having a planar view shape is configured to emit light downward. The illuminating devices 3 are respectively disposed on both ends of the parking lot 1, and the pair of illuminating devices 3 emit light toward the ground 2, so that the parking garage 1 is illuminated brightly and uniformly.
In addition, the illuminating device 3 of this invention is applicable also to the park which is the space 1 other than a parking lot, an indoor space, etc.

  FIG. 2 is a plan view showing an irradiation range of the illumination device, FIG. 3 is an explanatory view showing a configuration of an irradiation surface of the illumination device, and FIG. 4 is an explanatory view of the LED viewed from the side of the optical axis. is there. As shown in FIG. 1 to FIG. 4, the lighting device 3 is mounted and fixed to the upper end portion of a column (support member) 4 that protrudes upward from the central portion of the end portion extending in the longitudinal direction in the parking lot 1. 6 is provided. The casing 6 is formed in a rectangular thick plate shape, and one surface having a large area of the casing 6 is an irradiation surface 6a facing downward, and a heat sink (not shown) for cooling is installed inside or on the surface. ing.

  Incidentally, the irradiation surface 6a may be opposed to the ground 2 in parallel, or may be opposed to the ground 2 while being inclined. In the illustrated example, in the center side of the parking lot 1 It faces the ground 2 in a state inclined upward.

  A plurality of irradiation units 7 are installed on the irradiation surface 6 a of the housing 6. Each irradiation unit 7 includes one LED (light emitting diode) 8 and one light distribution lens 9.

  By fixing each LED 8 to the housing 6 so that the irradiation direction faces the direction in which the irradiation direction protrudes from the irradiation surface 6a (specifically, the direction perpendicular to or substantially perpendicular to the irradiation surface 6a), the optical axis S is fixed. Is set. Incidentally, the optical axes S of the plurality of LEDs 8 can be finely adjusted individually, and the housing 6 functions as a light emitting device (projector) by installing the plurality of LEDs 8.

  The LED 8 has a maximum light amount when the diffusion angle α is within a range of −20 to 20 degrees with respect to the optical axis S, and within a range where the diffusion angle α is 20 degrees or more and −20 degrees or less. The luminous intensity distribution is set so that the amount of light gradually decreases as the absolute value of the diffusion angle α increases.

  The irradiation unit 7 includes a first irradiation unit (wide area irradiation unit, target area irradiation unit) 7A, a second irradiation unit (wide area irradiation unit, non-target area irradiation unit) 7B, and a third irradiation unit (downward irradiation unit). The three types of irradiation units 7A, 7B, and 7C are provided with a first light distribution lens 9A, which is a dedicated light distribution lens 9, a second light distribution lens 9B, and a third distribution. While each of the optical lenses 9C is used, the LEDs 8 are all of the same type.

  FIG. 5A is a drawing showing the shape of the first light distribution lens when viewed from the optical axis direction, and FIGS. 5B and 5C are views as viewed from arrows B and C in FIG. 6A and 6B are a light amount distribution diagram of the first irradiation unit viewed in the optical axis direction and a light amount distribution diagram of the long axis direction. The first light distribution lens 9A has substantially the same shape as the outer shape when a pair of ellipses having the same shape are overlapped with each other so that the major axis is located on the same line in the optical axis S direction view, It is formed in a shape that rises in a dome shape from the irradiation surface 6a of the housing 6, and is made of a light-transmitting member (specifically, a colorless transparent synthetic resin, glass, or the like).

  In this way, a housing portion 11 serving as a housing space for housing the LED 8 is formed in the center portion of the first light distribution lens 9A in which the major axis Y1 is set in the major axis direction in the major axis Y1 direction. . The accommodating portion 11 has an isosceles triangular (more specifically, equilateral triangular) cross-sectional shape, and is formed in a direction perpendicular to the major axis Y1 direction. And the irradiation surface 6a side surface is open | released.

  Then, one first light distribution lens 9 </ b> A is installed on each LED 8 so as to cover the housing portion 11 from the lower side of the LED 8 fixed to the irradiation surface 6 a of the housing 6. At this time, the LED 8 is positioned at the central portion in the full length direction of the housing portion 11, and the first light distribution lens 9 </ b> A is in a posture in which the long axis Y <b> 1 direction of the first light distribution lens 9 </ b> A is parallel to the longitudinal direction of the parking lot 1. The housing 6 is attached and fixed to the irradiation surface 6a side.

  The light from the LED 8 is weakened in the direction of the optical axis S by the first light distribution lens 9A to reduce the amount of light, and is a straight line in one direction perpendicular to the optical axis S and parallel to its long axis Y1. The light intensity is increased along the light distribution Z1 that is a straight line. As a result, light emitted from the LED 8 in the direction of the optical axis S is strengthened toward the irradiation axis S1 extending in the direction intersecting the optical axis S, and the amount of light increases. The irradiation axis S1 intersects the optical axis S at a predetermined angle (65 degrees in the illustrated example), and the amount of light on the irradiation axis S1 is maximized.

  In addition, the light emitted from the LED 8 in the direction of the optical axis S is distributed symmetrically with respect to the light distribution Z1 by the first light distribution lens 9A and is orthogonal to both the optical axis S and the light distribution Z1. Light is distributed symmetrically with the straight line as the axis of symmetry (orthogonal line) Z2. In other words, the light from the LED 8 is distributed with an equal amount of light on both sides of the light distribution Z1 with the optical axis S as a boundary, and even on both sides of the symmetry axis Z2 with the optical axis S as a boundary. Light is distributed by the amount of light. Incidentally, the symmetry axis Z2 is parallel to the short axis Y2 of the first light distribution lens 9A and is in a state of being wrapped in a plan view.

  Since the long axis Y1 of the first light distribution lens 8A is fixed in a posture parallel to the long axis X1 of the parking lot 1 as described above, the light irradiated from the first irradiation unit 7A is the optical axis. Within a range (specifically, within a range between −65 degrees and 65 degrees) that extends on both sides of the long axis X1 by a predetermined angle (specifically, about 65 degrees) with respect to S, the horizontal direction is approached. The amount of light increases as the angle increases.

  FIG. 7A is an external view of the second light distribution lens as viewed in the optical axis direction, FIG. 7B is a view taken in the direction of arrow B in FIG. FIG. 8 is a light amount distribution diagram of the second irradiation unit as viewed in the optical axis direction. The second light distribution lens 9B is formed of a light-transmitting member (specifically, a colorless transparent synthetic resin, glass, or the like), and the second light distribution lens 9B is oval when viewed in the direction of the optical axis S. The long axis Y1 and the short axis Y2 having different lengths are formed vertically and horizontally, and are formed in a convex curved shape that rises from the irradiation surface 6a of the housing 6.

  Specifically, the second light distribution lens 9B has a surface far from the display surface 2 as viewed in the direction of the long axis Y1 and stands up perpendicularly to the opposing surface 6a, while the other upper surface. In addition, the surface on the display surface 2 side is formed in an arc shape having a quarter or more circumference. The second light distribution lens 9B has a symmetrical arc shape of about ½ when viewed in the direction of the short axis Y2.

  In the second light distribution lens 9B, an accommodation portion 11 for accommodating the LED 8 is formed in the direction of the minor axis Y2. The accommodating portion 11 has an isosceles triangle shape (more specifically, an equilateral triangle shape) in a cross-sectional view, and is formed in an inverted V shape in which the apex is biased toward the display surface 2 when viewed in the long axis Y1 direction. The LED 8 is accommodated in the central portion of the accommodating portion 11 in the minor axis Y2 direction.

  Then, one second light distribution lens 9 </ b> B is installed on each LED 8 so as to cover the housing portion 11 from the lower side of the LED 8 fixed to the irradiation surface 6 a of the housing 6. At this time, the LED 8 is positioned at the central portion in the full length direction of the housing portion 11, and the second light distribution lens 9B is in a posture in which the long axis Y1 direction of the second light distribution lens 9B is parallel to the longitudinal direction of the parking lot 1. The housing 6 is attached and fixed to the irradiation surface 6a side.

The light amount distribution diagram in the major axis direction of the second irradiation unit 7B having the above configuration is the same as or substantially the same as that of the first irradiation unit 7A, and the light amount distribution in the optical axis S direction view is as shown in FIG. Specifically, the second light distribution lens 9B is weakened in the direction of the optical axis S to reduce the amount of light, and is a straight line in one direction perpendicular to the optical axis S and parallel to its long axis Y1. The light intensity is increased along the light distribution Z1 that is a straight line. As a result, the light emitted from the LED 8 in the direction of the optical axis S is strengthened toward the irradiation axis S1 extending in the direction intersecting the optical axis S, and the amount of light increases. The irradiation axis S1 intersects the optical axis at a predetermined angle (65 degrees in the illustrated example), and the amount of light on the irradiation axis S1 is maximized.

  In addition, the light irradiated in the direction of the optical axis S from the LED 8 is symmetrically distributed by the second light distribution lens 9B with a straight line orthogonal to both the optical axis S and the light distribution Z1 as a symmetry axis (orthogonal line) Z2. Is done. In other words, the light from the LED 8 is distributed with an equal amount of light on both sides of the light distribution axis Z1 with the optical axis S as a boundary. In addition to this, the light emitted from the LED 8 in the direction of the optical axis S is, by the second light distribution lens 9B, the other side (stronger) with respect to one side (weaker side) of the symmetry axis Z2 with the optical axis S as a boundary. The amount of light increases. Incidentally, the axis of symmetry Z2 is parallel to the short axis Y2 of the second light distribution lens 9B, and both lines Y2 and Z2 are in a lapped state in plan view.

  And the long axis Y1 of the second light distribution lens 8B is parallel to the long axis X1 of the parking lot 1 as described above, and the weak side of the symmetry axis Z2 is located on the side close to the parking lot 1 itself in plan view. At the same time, the stronger side is located on the side away from the parking lot 1 in plan view.

  For this reason, the light irradiated from the second irradiation unit 7B is within a range (specifically, −−) that extends on both sides of the long axis X1 by a predetermined angle (specifically about 65 degrees) with respect to the optical axis S. In the range between 65 degrees and 65 degrees), the closer to the horizontal direction (the wider the angle), the larger the amount of light, and in plan view on the minor axis X2 of the parking lot 1 that wraps around the symmetry axis Z2. The side farther from the side closer to itself is illuminated brightly.

  9A and 9B are an exploded side view and a plan view of the third irradiation unit, and FIG. 10A is an explanatory view when the irradiation state of the third irradiation unit is viewed from the side, B) is a light amount distribution diagram of the third irradiation unit as viewed in the optical axis direction. The third light distribution lens 9 </ b> C includes a housing 12 and a lens body 13.

  The housing 12 is formed in a cylindrical shape having the same axis as the optical axis S, and a lens hole 12a is formed at the irradiation side end of the housing 12, and the diameter of the lens hole 12a gradually decreases toward the bottom side. The bottom of the lens hole 12a is close to or in communication with (in the example shown in the drawing) the housing 11 that houses the LED 8. The accommodating part 11 is shape | molded in the shape which follows the shape of LED8, and LED8 is installed in the state fitted and accommodated in this accommodating part 11. As shown in FIG.

  The lens body 13 is formed in a truncated cone shape along the inner periphery of the lens hole 12a, and is fitted and inserted into the lens hole 12a. In a state where the lens body 13 is fitted and inserted into the lens hole 12a, the housing 12 and the lens body 13 are aligned with the optical axis S.

  In the lens body 13, at least a part of the light emitting portion of the LED 8 is accommodated directly or indirectly (in the illustrated example, indirectly via the housing 12) at the small-diameter side end face located on the bottom side of the lens hole 12 a. The concave surface 13a.

  A third light distribution lens 9C is configured by fitting and inserting the entire lens body 13 into the lens hole 12a, and the entire LED 8 is accommodated and installed in the accommodating portion 11 of the third light distribution lens 9C. At least a part of the light emitting portion of the LED 8 is accommodated in the concave surface 13a to constitute the third irradiation unit 7C.

  Incidentally, the lens body 13 is made of a light-transmissive member (specifically, a colorless and transparent synthetic resin, glass, or the like). On the other hand, the housing 12 is not necessarily composed of such a member, but in this example, it is composed of a light-transmitting member (specifically, a colorless and transparent synthetic resin, glass, or the like). .

  In the third irradiation unit 7 </ b> C configured as described above, a range that is widened by an angle (irradiation angle) β of 15 to 30 degrees with respect to the optical axis S is set as the irradiation range, and this irradiation range is the lens hole 12 a of the housing 12. The setting can be changed by exchanging the lens main body 13 fitted and installed in the lens. In other words, the third irradiation unit 7C emits light in a conical shape toward the irradiation side, and the light amount distribution of the third irradiation unit 7C viewed in the direction of the optical axis S is a circle centered on the LED 8, Accordingly, the third irradiation unit 7C distributes the light from the LED 8 uniformly or substantially uniformly over the entire circumference of the optical axis S as viewed in the optical axis S direction.

  For this reason, the third irradiation unit 7C is strengthened with the light from the LED 8 along the optical axis S, the light quantity is maximized on the optical axis S, and the light distributed on the optical axis S is An object on or near the optical axis S is brightly illuminated. Incidentally, a slight diffusion is allowed in the direction of the optical axis S as indicated by the irradiation angle β.

  The three types of irradiation units 7A, 7B, and 7C as described above are arranged on the irradiation surface 6a of the housing 6 as shown in FIG. Specifically, the first irradiation unit 7A, the second irradiation unit 7B, and the third irradiation unit 7C are arranged in a matrix.

  As described above, the long axes Y1 of the first light distribution lens 9A and the second light distribution lens 9B are all directed in a direction parallel to the long axis X1 of the parking lot 1, which is the same direction. As a result, the first light distribution lens The short axes Y2 of the lens 9A and the second light distribution lens 9B are all directed in the same direction.

  A plurality of first irradiation units 7A are arranged at predetermined intervals (equally spaced in the example shown) along the short axis Y2 direction (specifically in parallel) to form a first irradiation unit row L1, and the short A plurality of second irradiation units 7B are arranged at predetermined intervals (equal intervals in the illustrated example) along the direction of the axis Y2 (specifically in parallel) to form a second irradiation unit row L2, and the long axis Y1 A plurality of third irradiation units 7C are arranged in parallel along the direction (specifically in parallel) at predetermined intervals (equal intervals in the illustrated example) to form a third irradiation unit row L3.

  A plurality of second irradiation unit rows L2 (two rows in the illustrated example) are formed on the center side of the irradiation surface 6a in the direction of the long axis Y1, and the length of the second irradiation unit row L2 arranged in the plurality of rows is formed. One or a plurality of first irradiation unit rows L1 (one row in the illustrated example) are arranged on both outer sides in the axis Y2 direction so as to sandwich the set of the second irradiation unit rows L2.

  The number of irradiation units 7B in the second irradiation unit row L2 is smaller than the number of irradiation units 7A in the first irradiation unit row L1, and the ends of the first irradiation unit row L1 and the second irradiation unit row L2 are located at positions. Since they are aligned, a space is formed between the other ends of the pair of first irradiation unit rows L1 and L1 that are opposed to each other with the first irradiation unit row L2 interposed therebetween, and the third irradiation unit is formed in this space. One or a plurality of rows L3 (one row in the illustrated example) are arranged.

  Incidentally, the number of irradiation units 7C of the third irradiation unit row L3 is the same as the number of rows of the second irradiation unit L2, and the number of rows of the third irradiation unit row L3 is the irradiation unit of the first irradiation unit row L1. This is the same as the value obtained by subtracting the number of irradiation units 7A in the second irradiation unit row L2 from the number of 7A, and thereby a plurality of irradiation units 7 on the irradiation surface 6a are arranged in a matrix.

  According to the illuminating device 3 configured as described above, the proximity area A that is a range closer to itself in the minor axis X2 direction of the parking lot 1 is the light from the first irradiation unit 7A and the second irradiation unit 7B. The separation area B, which is a range farther from itself in the minor axis X2 direction of the parking lot 1, is illuminated by the light from the second irradiation unit 7B and below the irradiation surface 6a of the housing 6 (specifically The concentrated irradiation area C, which is narrower than the proximity area A and the separation area B (directly below), is intensively illuminated by the light from the third irradiation unit 7C.

  Incidentally, since this irradiation area C is narrower than the proximity area A and the separated area B, the number of the third irradiation units 7C installed on the irradiation surface 6a is the number of the first irradiation units 7A installed or This is less than the number of second irradiation units 7B installed.

  Moreover, since the illuminating device 3 is installed in the both ends of the parking lot 1, the parking lot 1 is illuminated brightly from both sides. Moreover, since at least a part of the proximity area A and the separation area B of the two lighting devices 3 and 3 overlap each other, the central portion of the parking lot 1 far from the lighting device 3 can be illuminated brightly.

  Furthermore, since the lower part of the housing 6 of the illuminating device 3 is brightly illuminated by the third irradiation unit 7C, the irradiation axes S1 of the first irradiation unit 7A and the second irradiation unit 7B are set in a state where the lower part of the lighting device 3 is brightly illuminated directly below itself. An angle closer to the horizontal direction (65 degrees in this example) can be set. By setting the irradiation axis S1, the light from the first irradiation unit 7A and the second irradiation unit 7B can be emitted in the horizontal direction, so that the overhead height of the user in the parking lot 1 is increased. It becomes possible to shine brightly to the extent.

Next, based on FIG. 11 thru | or FIG. 13, the different structure from the above-mentioned form is demonstrated about another embodiment of this invention.
FIGS. 11A and 11B are a plan view and a side view of an outdoor lamp installed in a park, and FIGS. 12A and 12B are a side view and a view in the optical axis direction of the fourth light distribution lens. FIGS. 13A and 13B are plan views, in which FIG. 13A is a light amount distribution diagram of the fourth irradiation unit as viewed in the optical axis direction, and FIG. . In the example illustrated, the lighting device 3 is installed on the center side of the park 1.

  The support member 4 of the lighting device 3 includes a support column 14 and a rod-shaped support frame 16 that protrudes in the horizontal direction from the upper end portion of the support column 14, and a housing 6 is installed at the distal end portion of the support frame 16. . The irradiation surface 6a of the housing 6 is directed directly downward, and the optical axis S of each LED is set in the vertical direction. Incidentally, a driver 17 including a control circuit for each LED is provided in the middle of the column 14.

  The irradiation unit 7 installed in the housing 6 is of two types, the third irradiation unit 7C described above and a fourth irradiation unit (wide area irradiation unit) 7D described later, and the number of fourth irradiation units 7D is as follows. More than the number of the third irradiation units 7C.

  The fourth irradiation unit 7D includes the above-described LED 8 and a fourth light distribution lens 9D. The fourth light distribution lens 9D is formed in a circular shape as viewed in the direction of the optical axis S, and is formed in a shape dome-shaped from the irradiation surface 6a of the housing 6, and has a light-transmitting member (specifically Specifically, it is made of a colorless and transparent synthetic resin or glass.

  A cylindrical housing portion 11 extending in the direction of the optical axis S is formed at the center of the fourth light distribution lens 9D as viewed in the optical axis S direction, and the housing portion 11 has an open end on the irradiation surface 6a side. Thus, an accommodation space for accommodating the LED 8 is provided.

  Then, one first light distribution lens 9 </ b> A is installed on each LED 8 so as to cover the housing portion 11 from the lower side of the LED 8 fixed to the irradiation surface 6 a of the housing 6. At this time, the LED 8 is positioned at the axial center of the accommodating portion 11.

  The light emitted from the LED 8 in the direction of the optical axis S is intensified toward the irradiation axis S1 extending in the direction intersecting the optical axis S, and the amount of light increases. The irradiation axis S1 intersects the optical axis at a predetermined angle (70 to 75 degrees in the illustrated example), and the light quantity of the irradiation axis S1 is maximized. Moreover, the light from the LED 8 is evenly distributed in all directions by 360 degrees when viewed in the direction of the optical axis S by the fourth light distribution lens 9D, and forms a circular light quantity distribution centered on the optical axis S. In other words, since the light is evenly distributed in all directions of 360 degrees when viewed in the direction of the optical axis S, the fourth light distribution lens 9D causes the light from the LED 8 to travel along an arbitrary straight line (not shown) orthogonal to the optical axis S. Light is distributed symmetrically about the axis of symmetry.

  The light irradiated from the first irradiation unit 7A is irradiated over the entire circumference around the axis of the optical axis S with respect to the optical axis S, and this irradiation angle becomes the angle of the irradiation axis S1. Until, the light quantity increases as it approaches the horizontal direction.

  According to the illuminating device 3 configured as described above, the area immediately below the housing 6 is intensively illuminated by the third irradiation unit 7C, and the wide area below the housing 6 is illuminated brightly by the fourth irradiation unit 7D. Thereby, the entire space 1 is illuminated brightly and uniformly.

  This is the same as the above example, but the lower part of the housing 6 of the illumination device 3 is brightly illuminated by the third irradiation unit 7C. Can be set to an angle closer to the horizontal direction (65 degrees in this example). By setting the irradiation axis S1, the light from the first irradiation unit 7D can be radiated while being strengthened in the horizontal direction.

Next, a configuration different from the above-described embodiment will be described with reference to FIG.
FIGS. 14A and 14B are a plan view and a side view of an outdoor lamp installed in a room. In the example shown in the figure, a plurality (specifically, three) of the lighting devices 3 are arranged in parallel at portions near both ends of the room 1, which is an indoor space.

  The ceiling of the lighting device 3 is supported by the support member 4. The light distribution lens 9 to be used may be of the type shown in FIGS. 1 to 10 or of the type shown in FIGS. 11 to 13. When the type shown in FIGS. 1 to 10 is used, the proximity area A is arranged on the end side of the room 1 and the separation area B is arranged on the center side of the room 1.

  The plurality of lighting devices 3 can brightly illuminate the entire room 1 including the vertical direction.

7 Irradiation Unit 7A First Irradiation Unit (Wide Area Irradiation Unit 7, Symmetric Area Irradiation Unit)
7B 2nd irradiation unit (wide area irradiation unit 7, asymmetrical range irradiation unit)
7C 3rd irradiation unit (downward irradiation unit)
7D 4th irradiation unit (wide area irradiation unit)
8 LED (light emitting diode)
9 Light distribution lens S Optical axis Z1 Light distribution Z2 Axis of symmetry (orthogonal line)

Claims (4)

A lighting device installed at a predetermined height from the ground or floor, which emits light downward, and a light distribution lens (9) for distributing light from the light emitting diode (8) A plurality of irradiation units (7) each having an optical axis (S) oriented in the same or substantially the same direction, and at least one irradiation unit (7) is provided by a light distribution lens (9). The light from the light emitting diode (8) is distributed on a wide range around the optical axis (S) by weakening the light on the optical axis (S) side and strengthening the light from the optical axis (S). A wide area irradiation unit (7A, 7B, 7D), and at least one irradiation unit (7) other than the wide area irradiation unit (7A, 7B, 7D), light from the light emitting diode (8) is distributed to the light distribution lens (9 ) On the optical axis (S) or By using the lower irradiation unit (7C) configured to distribute light in a narrow range close to the axis (S), the light is attenuated by the light distribution of the wide-area irradiation units (7A, 7B, 7C) and the amount of light is reduced. The illumination device that compensates for the light distribution to the narrow range of the lower irradiation unit (7C) on or near the optical axis (S) where the light is insufficient.   The said wide area irradiation unit (7A, 7B, 7D) is provided with two or more, The installation number of this wide area irradiation unit (7A, 7B, 7D) was set more than the installation number of a downward irradiation unit (7C). Lighting equipment.   From the light emitting diode (8), the light distribution lens (9) of the wide area irradiation unit (7D) has a circular light amount distribution centered on the optical axis (S) when viewed in the direction of the optical axis (S). The lighting device according to claim 1, wherein the light is distributed.   The light distribution lens (9) of the wide area irradiation unit (7A, 7B) distributes the light from the light emitting diode (8) so as to spread on both sides of the light distribution (Z1) orthogonal to the optical axis (S). The illumination device according to claim 1, which emits light.

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