JP2016085929A - LED lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device that can improve a uniformity ratio of an irradiation surface such as a desk, table, and floor surfaces.SOLUTION: An LED lighting device has an LED light emitting part 110 where a plurality of LEDs are arranged in a row and a control part 120 for controlling LED current. The plurality of LEDs are separated into a plurality of groups and current to be supplied is controlled at each group. By controlling current to be supplied to each LED to increase a flux of light of an end part from a central part of the LED light emitting part 110, a uniformity ratio of an irradiation surface in a longer direction of the LED light emitting part 110 is improved.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an LED lighting device that improves the uniformity of an irradiated surface.

  With the rapid spread of LEDs in recent years, LED lighting devices have been used in place of incandescent bulbs and fluorescent lamps.

  An LED is a very small point light source, and usually has a large light spread angle, so that light is emitted radially. For this reason, although the irradiation surface directly under LED is very bright, the brightness of an irradiation surface falls rapidly as it deviates from right below.

  Therefore, normally, an LED lighting device can produce various light spaces when used as interior lighting. On the other hand, special illumination is required to uniformly illuminate flat parts such as tables and floors as in general lighting.

  For this reason, in Patent Document 1 below, by condensing the diffused light beam from the light source unit in an angle region corresponding to the width of the illumination region in the width direction of the illumination region, the fan-shaped condensed light beam spreading in the longitudinal direction of the illumination region is obtained. The exiting sub-lens and the condensed light beam condensed by the sub-lens are emitted toward the illumination region as a whole, and a part thereof is refracted along the longitudinal direction to the direction of the far end region in the illumination region There is disclosed an illumination engineering system that includes a main lens that emits light to and efficiently illuminates with sufficient luminance and good luminance uniformity.

  Also, in Patent Document 2 below, light incident on a predetermined angle range in which the angle formed by the incident surface of the medium portion and the optical axis of the light emitting element is greater than zero and less than π of 2 is directed away from the optical axis. The light emitting device is formed in a shape to be refracted, and the exit surface is provided in a region including a point intersecting with the optical axis of the light emitting element and is formed of a concave curved surface recessed in a direction approaching the light emitting device (downward), It is divided into a curved second exit surface provided outside, and the exit surface has a ratio θ2 / θ1 of the second refraction angle θ2 to the first refraction angle θ1 larger than 1 (θ2 / θ1> 1), and A lighting fixture is disclosed which is formed in a shape that causes a change in which the ratio once increases as the first refraction angle θ1 increases and then gradually decreases, thereby improving the luminance uniformity on the light emitting surface. Has been.

JP 2009-99493 A JP, 2014-120289, A

  The inventions disclosed in the cited document 1 and the cited document 2 use the principle of a lens so that light emitted from the LED is irradiated in a wide range as perpendicular to the irradiation surface as possible.

  However, in a lighting device having a vertically long light-emitting surface, such as a desk light or a straight tube fluorescent lamp, even if the inventions described in Cited Document 1 and Cited Document 2 are applied, a desk, a table, a floor surface, etc. It is difficult to uniformly illuminate such a flat surface.

  The present invention has been made to solve the conventional problems as described above, and it is an object of the present invention to provide an LED lighting device that improves the uniformity of an irradiation surface such as a desk, a table, and a floor surface. And

  In order to achieve the above object, an LED lighting device according to the present invention includes an LED light emitting unit and a control unit.

  A plurality of LEDs are arranged in a row in the LED light emitting section. A control part controls the electric current supplied to each LED so that the light beam of an edge part may increase rather than the center part of LED light emission part. Thereby, the uniformity of the irradiation surface of the LED light emission part in the longitudinal direction is made uniform.

  According to the LED lighting device according to the present invention having the above-described configuration, the end portion is brighter than the central portion of the LED light emitting portion, so that even if the light emitting surface is a vertically long lighting device. It is possible to improve the uniformity of the irradiated surface such as a desk, a table, a floor surface and the like.

1 is an external view of an LED lighting device according to Embodiment 1. FIG. It is detail drawing of the LED light emission part of the LED lighting apparatus concerning Embodiment 1. FIG. It is a block diagram of the control part of the LED lighting apparatus concerning Embodiment 1. FIG. It is a figure which shows the 1st measurement example of the LED lighting apparatus concerning Embodiment 1. FIG. It is a figure which shows the measurement result of the 1st measurement example. It is a figure which shows the 2nd measurement example of the LED lighting apparatus concerning Embodiment 1. FIG. It is a figure which shows the measurement result of the 2nd measurement example. It is detail drawing of the LED light emission part of the LED lighting apparatus concerning Embodiment 2. FIG. It is explanatory drawing of the light distribution state of the LED lighting apparatus concerning Embodiment 1 and 2. FIG. It is explanatory drawing of the light distribution state of the LED lighting apparatus which concerns on Embodiment 3 which attached the light distribution lens to the LED lighting apparatus concerning Embodiment 1 and 2. FIG.

  Hereinafter, an LED lighting device according to the present invention will be described in detail from [Embodiment 1] to [Embodiment 3] with reference to the drawings.

[Embodiment 1]
(Configuration of LED lighting device)
[Overall configuration]
FIG. 1 is an external view of an LED lighting device according to the first embodiment. As illustrated in FIG. 1, the LED lighting device 100 according to the first embodiment includes an LED light emitting unit 110, a rising portion 115, and a base 130.

  In the LED lighting device 100, the length of the LED light emitting unit 110 in the longitudinal direction is approximately 60% of the length of the table 135 in the lateral direction. In addition, the ratio of the length of the longitudinal direction of the LED light emission part 110 with respect to the length of the horizontal direction of the table 135 is not restricted to about 60% as mentioned above. In order to improve the uniformity of the irradiated surface, it is sufficient if it has a length of 50% or more. The greater the length ratio, the more the uniformity of the irradiated surface is improved.

  In the LED lighting device 100, a plurality of LEDs are arranged in a row. A control unit (described later) for controlling the LED current is built in the base unit 130. A control part controls the electric current supplied to each LED so that the light beam of an edge part may increase from the center part of the LED light emission part 110. FIG.

[Configuration of LED light emitting unit]
FIG. 2 is a detailed diagram of an LED light emitting unit of the LED lighting device according to the first embodiment.

  As shown in FIG. 2, the LED light emitting unit 110 has a plurality of LEDs 145 arranged in a straight line at equal intervals. Specifically, 80 LEDs 145 attached to the substrate are linearly arranged at equal intervals. In the first embodiment, 80 LEDs 145 are arranged in the LED light emitting unit 110. However, the number of LEDs 145 is not limited to this, and may be at least 80 or more.

  The 80 LEDs 145 are divided into 8 groups of 10 each. Further, as shown in FIG. 2, the LED light emitting unit 110 is divided into eight sections of section 1, section 2,..., Section 8 in the longitudinal direction of the LED light emitting unit 110. In each section, LEDs 145 divided into groups are arranged.

  Specifically, ten LEDs 145 in the first group are arranged in section 1, and ten LEDs 145 in the second group are arranged in section 2. Similarly, ten LEDs 145 from the third group to ten LEDs 145 from the eighth group are arranged in section 3 to section 8.

  In the first embodiment, the LEDs 145 are divided into 8 groups of 10 each, but the number of divisions is not limited to eight. For example, the LEDs 145 may be divided into four groups of 20 each, or the LEDs 145 may be divided into 16 groups of 5 each. Further, instead of dividing the same number of LEDs 145 into respective groups, different numbers of LEDs 145 may be divided into respective groups. Conceptually, each LED 145 can be divided into groups. In other words, in the above example, 80 LEDs 145 can be divided into 80 groups.

  The LED light emitting unit 110 is provided with a number of sections corresponding to the number of groups. This is because the control unit described later controls the current supplied to the LED 145 for each section. The greater the number of groups, the better the uniformity of the irradiated surface.

  In the case of Embodiment 1, in order to improve the uniformity of the irradiation surface on the table 135, it is desirable to divide at least the LEDs 145 into three or more groups and arrange them in three or more sections. However, the LED 145 may be divided into two groups and arranged in two sections as long as the uniformity is improved as much as possible.

  A control part controls the electric current supplied to LED145 for every group of LED145, in other words, for every section.

  In the case of the first embodiment, the control unit suppresses the light flux by supplying a small amount of current to the LEDs 145 of the sections 4 and 5 located at the center of the LED light emitting unit 110. Further, sections 2 and 3 and sections 6 and 7 toward the end of the LED light emitting unit 110 supply a larger current than the LEDs 145 of the sections 4 and 5 to increase the luminous flux compared to the LEDs 145 of the sections 4 and 5. . Further, the sections 1, 8 at the end of the LED light emitting section 110 supply a larger current than the LEDs 145 of the section sections 2, 3 and sections 6, 7, so that the section sections 2, 3 and sections 6, 7 The luminous flux is increased more than that of the LED 145.

  Therefore, the LED light emitting unit 110 has a small luminous flux at the center, and the luminous flux increases toward the end. As described above, when the luminous flux is increased from the central portion toward the end portion, the uniformity of the irradiation surface in the longitudinal direction of the LED light emitting portion 110 can be improved.

  As described above, when the LEDs 145 are divided into two groups, the luminous fluxes of the LEDs in the groups located at the ends of the LED light emitting unit 110 are made larger than the light speeds of the LEDs in the other groups. As described above, even in the two groups, the uniformity of the irradiation surface in the longitudinal direction of the LED light emitting unit 110 can be improved by making the luminous flux at the end portion larger than the central portion.

[Configuration of control unit]
FIG. 3 is a block diagram of a control unit of the LED lighting apparatus 100 according to the first embodiment.

  The control unit 120 includes a section 1 current control unit 124-1,..., A section 8 current control unit 124-8, and an LED power source 126.

  The LEDs 145 of the LED light emitting unit 110 according to the first embodiment are divided into eight groups, and each group is arranged in eight sections. For this reason, eight current control units are provided corresponding to each section from the section 1 current control unit 124-1 to the section 8 current control unit 124-8. The section 1 current control unit 124-1 controls the current supplied to the ten LEDs 145 arranged in the section 1. Similarly, the section 2 current control section to the section 8 current control section 124-8 control the current supplied to each of the ten LEDs 145 disposed in the section 2 to the section 8.

  Specifically, the section 1 current control unit 124-1 and the section 8 current control unit 124-8 supply a larger current to the LEDs 145 located in the section 1 and the section 8 than the other sections.

  In addition, the section 2 current control unit, the section 3 current control unit, the section 6 current control unit, and the section 7 current control unit are connected to the LED 145 located in the sections 2, 3, 6, and 7 with the section 1 current control unit 124-1. A current smaller than the current supplied by the section 8 current control unit 124-8 is supplied.

  Further, the section 4 current control unit and the section 5 current control unit include the section 2 current control unit, the section 3 current control unit, the section 6 current control unit, and the section 7 current control unit in the LED 145 located in the section 4 and the section 5, respectively. Supply a smaller current than the supplied current.

  When the current control unit of each section performs such current control, sections 1 and 8 shown in FIG. 2 are brightest, sections 2, 3, 6, and 7 are slightly darker than sections 1 and 8, 4 and 5 are the darkest. In this way, by changing the brightness in the longitudinal direction of the LED light emitting unit 110 according to the location, evenness of the irradiated surface such as a desk, table, floor surface, etc., even if the light emitting surface is a vertically long lighting device Can be improved.

  In the above embodiment, the case where the LED 145 of the LED light emitting unit 110 is divided into eight sections is described. However, when the LED 145 is divided into three or two sections as described above, the section current is divided. Three or two control units may be provided.

  In addition, even when divided into eight sections as described above, the current magnitude is controlled symmetrically with respect to the central portion, so the currents in sections 1 and 8 are controlled by one current control unit. The sections 2, 3, 6, and 7 may be controlled by one current control unit, and the sections 4 and 5 may be controlled by one current control unit.

(Operation of LED lighting device)
(Measurement example)
Next, the operation of the LED lighting device 100 according to the first embodiment will be described by exemplifying two measurement examples.

(First measurement example)
FIG. 4 is a diagram illustrating a first measurement example of the LED lighting device 100 according to the first embodiment. In the first measurement example, the number of LEDs 145 arranged in the LED light emitting unit 110 is 90, the LEDs 145 are divided into nine groups of ten, and the LEDs 145 of each group are arranged in sections 1 to 9.

  As shown in FIG. 4, the LED light emitting unit 110 has a length of 410 mm, the rising portion 115 has a height of 740 mm, the table 135 has a horizontal length of 1200 mm, and a vertical length of 710 mm. The table 135 is a general office desk size.

  FIG. 5 is a diagram illustrating a measurement result of the first measurement example. FIG. 5A shows the brightness distribution of nine sections of the LED light emitting unit 110. FIG. 5B shows the illuminance (lux) at the illuminance measurement points A to I in FIG. FIG. 5C shows the uniformity at the illuminance measurement point in the longitudinal direction of the LED light emitting unit 110. FIG. 5D shows the uniformity in the entire desk.

  In the first measurement example, as shown in FIG. 5A, three distributions from series 1 to series 3 are set as the brightness distribution of 9 sections. In series 1, the brightness of all sections was set to 2. In series 2, the brightness of the four sections of sections 1, 2, 8, and 9 is set to 3, the brightness of the four sections of sections 3, 4, 6, and 7 is set to 2, and the brightness of section 5 at the center is set. Was set to 1. In series 3, the brightness of the four sections of sections 1, 2, 8, and 9 is set to 3, and the brightness of the five sections of sections 3, 4, 5, 6, and 7 is set to 1 (note that the brightness is The higher the number, the brighter).

  As shown in FIG. 4, in each series, the illuminance at each illuminance measurement point of A, B, C, D, E, F, G, H, and I on the table was examined. The result was a distribution as shown in FIG.

  That is, when the brightness of all the sections is set to the same 2 as in the series 1, as shown in FIG. 5B, the illuminance measurement point of E in the center is the brightest, and D, F Illuminance measurement point, C, G illuminance measurement point in order of brightness, B, H illuminance measurement points become brighter than D, F illuminance measurement points, A, I illuminance measurement points C, It becomes brighter than the illuminance measurement point of G.

  When the ratio of the illuminance at the darkest illuminance measurement point to the illuminance at the brightest illuminance measurement point in the direction of illuminance measurement point A-B-C, that is, the uniformity in the longitudinal direction of the LED light emitting unit 110 is obtained, FIG. ) As shown in the series 1 of 0.5). Further, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point DEF was 0.44. Furthermore, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point GHI was 0.457.

  Next, as in series 2, the brightness of the four sections of sections 1, 2, 8, and 9 is set to 3, the brightness of the four sections of sections 3, 4, 6, and 7 is set to 2, and When the brightness of section 5 is 1, as shown in FIG. 5B, the illuminance measurement point E at the center is the brightest, the illuminance measurement points D and F, and the illuminance measurements C and G The brightness decreases in the order of points, the B and H illuminance measurement points become brighter than the D and F illuminance measurement points, and the A and I illuminance measurement points become as bright as the C and G illuminance measurement points.

  When the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point ABC was calculated, it was 0.524 as shown in series 2 in FIG. Further, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point DEF was 0.53. Furthermore, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the illuminance measurement point G-H-I direction was 0.557.

  Next, when the brightness of the four sections of sections 1, 2, 8, and 9 is set to 3 and the brightness of the five sections of sections 3, 4, 5, 6, and 7 is set to 1 as in series 3 As shown in FIG. 5B, the E illuminance measurement point at the center is brightest, the brightness decreases in the order of D, F illuminance measurement points, C, G illuminance measurement points, The illuminance measurement points for H become brighter than the illuminance measurement points for D and F, and the illuminance measurement points for A and I become as bright as the illuminance measurement points for C and G.

  When the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point ABC was found, it was 0.531 as shown in the series 3 in FIG. Further, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point DEF was 0.51. Furthermore, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point GHI was 0.61.

  Comparing the uniformity of the illuminance measurement points ABC, DEF and GHI directions in series 1 to series 3, series 2 and 3 are better than series 1 It can be seen that the uniformity is improved.

  Also, when looking at the uniformity of the entire desk in the series 1 to the series 3, as shown in FIG. 5D, the illuminance measurement points ABC direction, DEF direction, GH direction These are almost the same numbers.

  As described above, it can be confirmed that the uniformity in the longitudinal direction of the LED light emitting unit 110 is improved by controlling the current value. In this measurement experiment, a lens that improves the uniformity in the direction intersecting the longitudinal direction is used. Therefore, when looking at the uniformity of the entire desk, there is no significant improvement in series 1, 2, and 3.

(Second measurement example)
FIG. 5 is a diagram illustrating a second measurement example of the LED lighting device 100 according to the first embodiment. In the second measurement example, the number of LEDs 145 arranged in the LED light emitting unit 110 is 130, the LEDs 145 are divided into 13 groups of 10 pieces, and the LEDs 145 of each group are arranged in the sections 1 to 13.

  As shown in FIG. 5, the LED light emitting unit 110 has a length of 700 mm, the rising portion 115 has a height of 740 mm, the table 135 has a horizontal length of 1200 mm, and a vertical length of 710 mm. The table 135 is a general office desk size.

  FIG. 7 is a diagram illustrating a measurement result of the second measurement example. FIG. 7A shows the brightness distribution of 13 sections of the LED light emitting unit 110. FIG. 7B shows the illuminance at the illuminance measurement points A to I in FIG. FIG. 7C shows the uniformity at the illuminance measurement point in the longitudinal direction of the LED light emitting unit 110. FIG. 7D shows the uniformity in the entire desk.

  In the second measurement example, as shown in FIG. 7A, three distributions from series 1 to series 3 are set as the brightness distribution of 13 sections. In series 1, the brightness of all sections was set to 2. In series 2, the brightness of the four sections of sections 1, 2, 12, and 13 is set to 3, the brightness of the four sections of sections 3, 4, 10, and 11 is set to 2, and the sections 5, 6, and The brightness of 5 sections 7, 8 and 9 was set to 1. In series 3, the brightness of the four sections of sections 1, 2, 12, and 13 was set to 3, and the brightness of the eight sections of sections 3 to 10 was set to 1.

  As shown in FIG. 6, in each series, the illuminance at the illuminance measurement points A, B, C, D, E, F, G, H, and I on the table was examined. The result was a distribution as shown in FIG.

  That is, when the brightness of all sections is set to 2 as in series 1, the illuminance measurement point of E in the center is the brightest as shown in FIG. Illuminance measurement points, C, G illuminance measurement points, the brightness decreases in order, B, H illuminance measurement points become as bright as D, F illuminance measurement points, A, I illuminance measurement points C, It becomes brighter than the illuminance measurement point of G.

  When the ratio of the illuminance at the darkest illuminance measurement point to the illuminance at the brightest illuminance measurement point in the direction of illuminance measurement point A-B-C, that is, the uniformity in the longitudinal direction of the LED light emitting unit 110 is obtained, FIG. ) As shown in series 1 of 0.5). Further, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point DEF was 0.542. Furthermore, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the illuminance measurement point G-H-I direction was 0.604.

  Next, as in series 2, the brightness of the four sections of sections 1, 2, 12, and 13 is set to 3, the brightness of the four sections of sections 3, 4, 10, and 11 is set to 2, and When the brightness of the five sections of sections 5, 6, 7, 8, and 9 is set to 1, as shown in FIG. 7B, the illuminance measurement point of E in the center is the brightest, and D, The brightness decreases in the order of F illuminance measurement point, C and G illuminance measurement points, B and H illuminance measurement points become as bright as D and F illuminance measurement points, and A and I illuminance measurement points become C. , G becomes brighter than the illuminance measurement point.

  When the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point ABC was found, it was 0.65 as shown in the series 2 in FIG. In addition, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point DEF was 0.656. Further, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point GHI was 0.704.

  Next, when the brightness of the four sections of the sections 1, 2, 12, and 13 is set to 3 and the brightness of the nine sections of the sections 3 to 11 is set to 1 as in the series 3, FIG. As shown in B), the E illuminance measurement point at the center is brightest, the brightness decreases in the order of D, F illuminance measurement points, C, G illuminance measurement points, and B, H illuminance measurement points , D and F illuminance measurement points become brighter, and A and I illuminance measurement points become brighter than C and G illuminance measurement points.

  When the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point ABC was found, it was 0.683 as shown in the series 3 in FIG. Further, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point DEF was 0.694. Furthermore, the uniformity in the longitudinal direction of the LED light emitting unit 110 in the direction of illuminance measurement point GHI was 0.763.

  Comparing the uniformity of the illuminance measurement points ABC, DEF, and GHI in series 1 to series 3, compared to series 1, the series 2 and 3 The numerical value of the horizontal uniformity is high.

  Also, when looking at the uniformity of the entire desk in the series 1 to the series 3, as shown in FIG. 7D, the illuminance measurement points ABC direction, DEF direction, GH direction The numerical value of the degree of uniformity is greater in the series 2 than in the series 1 and in the series 3 than in the series 2.

  As described above, it can be confirmed that the uniformity in the longitudinal direction of the LED light emitting unit 110 is improved by controlling the current value. In this measurement experiment, a lens that improves the uniformity in the direction intersecting the longitudinal direction is used. Therefore, when looking at the degree of uniformity of the entire desk, the degree of uniformity of series 2 and 3 is improved compared to series 1, but the improvement of the degree of uniformity limited to the longitudinal direction is less. .

  Comparing the first measurement example and the second measurement example, it can be seen that the numerical value of the degree of uniformity in the longitudinal direction of the LED light emitting unit 110 is larger in the second measurement example. Therefore, it can be understood that the uniformity of the illuminance surface can be further improved by increasing the length of the LED light emitting unit 110.

  As described above, in the first embodiment, the plurality of LEDs 145 arranged at equal intervals are divided into a plurality of groups, the magnitude of the current supplied to each group is controlled, and the end portion of the LED light emitting unit 110 is more than the center portion. Was made brighter. By this control, the uniformity in the lateral direction (see FIG. 1) of the irradiation surface such as a desk, table, floor surface, etc. is improved.

[Embodiment 2]
In the LED lighting device 100 according to the second embodiment, the arrangement state of the LEDs 145 of the LED light emitting unit 110 is different from the arrangement state of the LEDs 145 of the first embodiment. In the first embodiment, the mounting intervals of the LEDs 145 are uniform in all sections, but the mounting intervals of the LEDs 145 of the second embodiment are unequal for each section.

  FIG. 8 is a detailed view of the LED light emitting unit of the LED lighting device according to the second embodiment.

  As shown in FIG. 8, in the LED light emitting unit 110, a plurality of LEDs 145 are linearly arranged at unequal mounting intervals for each section. Specifically, forty-eight LEDs 145 attached to the board are divided into six sections of eight each, and are positioned in the end section rather than the mounting interval of the LEDs positioned in the central section of the LED light emitting section 110. It arrange | positions so that the mounting space of LED may become smaller. In the first embodiment, 48 LEDs 145 are arranged in the LED light emitting unit 110. However, the number of the LEDs 145 is not limited to this, and may be at least 48 or more.

  The 64 LEDs 145 are divided into 6 groups of 8 each. Further, as shown in FIG. 8, the LED light emitting unit 110 is divided into six sections of section 1, section 2,..., Section 6 in the longitudinal direction of the LED light emitting unit 110. In each section, LEDs 145 divided into groups are arranged.

  As shown in FIG. 8, the mounting interval of the LEDs 145 arranged in the sections 1 and 6 is the smallest than the other sections. Further, the mounting interval of the LEDs 145 arranged in the sections 3 and 4 is the largest as compared with the other sections. Further, the mounting interval of the LEDs 145 arranged in the sections 2 and 5 is an intermediate mounting interval between the sections 1 and 2.

  Thus, the same magnitude | size electric current is supplied with respect to all LED145 from the control part to the LED light emission part 110 which has arrange | positioned LED145. For this reason, the edge part becomes brighter than the center part of the LED light emission part 110 similarly to Embodiment 1. FIG.

  Therefore, the LED lighting device 100 according to the second embodiment can improve the uniformity in the longitudinal direction of the LED light emitting unit 110 as in the LDE lighting device 100 according to the first embodiment. The basic configuration of the control unit 200 is the same as that of the first embodiment.

  In the second embodiment, the same current is supplied to all the LEDs 145. However, in order to improve the uniformity, the current supplied to each section may be controlled as in the first embodiment.

[Embodiment 3]
The LED control device 100 according to the third embodiment has either the longitudinal direction of the LED light emitting unit 110 or the direction intersecting the longitudinal direction of the light emitted from the LED 145 to the LED light emitting unit 110 of the first and second embodiments. Alternatively, a light distribution lens 140 (see FIG. 8) for diffusing or condensing both is provided to improve the uniformity of the irradiated surface.

  As shown in FIG. 8, the light distribution lens 140 has a vertically long shape along the longitudinal direction of the LED light emitting unit 110 and is provided so as to cover all the LEDs 145. The light distribution lens 140 diffuses or condenses the light emitted from the LED 145 in one or both of the longitudinal direction of the LED light emitting unit 110 and the direction intersecting the longitudinal direction.

  FIG. 9 is an explanatory diagram of a light distribution state of the LED lighting device 100 according to the first and second embodiments. FIG. 10 is an explanatory diagram of a light distribution state of the LED lighting device 100 according to the third embodiment in which a light distribution lens is attached to the LED lighting device 100 according to the first and second embodiments.

  When the light distribution lens 140 is not provided as in the LED lighting device 100 according to the first and second embodiments, the light distribution of the LED 145 is as shown in FIGS. 9A and 9B. Radiates directly below 110. For this reason, as shown to FIG. 9 (A), as for the irradiation surface, the center part of the LED light emission part 110 becomes bright, and both ends become dark. Further, as shown in FIG. 9B, much light emitted from the LED light emitting unit 110 leaks from the irradiation surface.

  However, in the case where the light distribution lens 140 is provided as in the LED lighting device 100 according to the third embodiment, the light distribution spreading in the longitudinal direction of the LED 145 and the direction intersecting the longitudinal direction is controlled. In particular, as shown in FIG. 10 (A), the light irradiation angle by the light distribution lens 140 is reduced from the center to the end of the LED light emitting unit 110 (110 ° → 60 ° → 30). Therefore, as shown in FIG. 9B, in the longitudinal direction of the LED 145, the light flux leaking from the irradiation surface can be reduced. For this reason, the brightness of the irradiated surface of the desk is almost uniform on any part.

  The light distribution lens 140 may be provided only at the end portion without being provided at the central portion, or may be provided individually for each LED 145.

  The above embodiment is illustrated for specifically explaining the idea of the present invention, and the present invention is not limited to the embodiment.

100 LED lighting device,
110 LED light emitting unit,
120 control unit,
124-1 section 1 current control part,
124-8 Section 8 current controller,
126 LED power supply,
130 base,
135 Table 140 Light distribution lens,
145 LED.

Claims (6)

An LED light emitting unit in which a plurality of LEDs are arranged in a row;
A control unit for controlling the current supplied to each LED so that the luminous flux at the end portion is increased from the central portion of the LED light emitting unit, and
The LED lighting device characterized by improving the uniformity of the irradiation surface in the longitudinal direction of the LED light emitting unit.   The LED lighting device according to claim 1, wherein the plurality of LEDs are arranged at equal intervals.   The plurality of LEDs are arranged such that a mounting interval of LEDs positioned at an end portion is smaller than a mounting interval of LEDs positioned at a central portion of the LED light emitting unit. LED illuminating device of description.   The LED lighting device according to claim 1, wherein the plurality of LEDs are divided into a plurality of groups, and the control unit controls a current supplied for each group.   The LED lighting device according to claim 1, wherein the plurality of LEDs are divided into a plurality of groups for each LED having a different mounting interval, and the control unit controls a current supplied for each group. .   The LED light emitting unit includes a light distribution lens for diffusing or condensing light emitted by the plurality of LEDs in either or both of the longitudinal direction of the LED light emitting units and the direction intersecting the longitudinal direction, 6. The LED lighting device according to claim 1, wherein the uniformity of the irradiated surface is improved.