JP2018010800A - Light-emitting device and light source for illumination - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-emitting device which can suppress unevenness of brightness.SOLUTION: A light-emitting device 20 includes a first light emitting element group in which a plurality of first light emitting elements 23 are connected in series, and an anode end is electrically connected to a first terminal 21, and a cathode end is electrically connected to a second terminal 22. Further, the light emitting device 20 includes a second light emitting element group in which a plurality of second light emitting elements 24 are connected in series, a cathode end is electrically connected to the first terminal 21, an anode end is connected to the second terminal 22. In the first light emitting element group and the second light emitting element group, at least a part of the first light emitting element group and at least a part of the second light emitting element group constitute one or more light emitting element rows arranged in one direction on a substrate 25. In the light emitting element rows, the plurality of first light emitting elements 23 and the plurality of second light emitting elements 24 are alternately arranged one by one.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a light emitting device using a light emitting element such as a light emitting diode (LED) and an illumination light source including the light emitting device.

  Since LEDs are highly efficient and have a long lifetime, they are expected as new light sources in various lamps such as fluorescent lamps and incandescent lamps that have been conventionally known, and research and development of lamps using LEDs are underway. For example, Patent Document 1 discloses a straight tube LED lamp.

JP 2014-22267 A

  By the way, in a light-emitting device using a light-emitting element such as an LED and an illumination light source including the light-emitting device, it is desired to suppress a sense of discomfort given to the user by suppressing uneven brightness.

  The present invention provides a light-emitting device and an illumination light source that can suppress uneven brightness.

  A light-emitting device according to one embodiment of the present invention is a first light-emitting element group in which a first terminal and a second terminal that receive AC power and a plurality of first light-emitting elements are connected in series, and an anode end is the first light-emitting element group. A first light-emitting element group electrically connected to the terminal and having a cathode end electrically connected to the second terminal, and a second light-emitting element group in which a plurality of second light-emitting elements are connected in series, A second light emitting element group having an end electrically connected to the first terminal and an anode end electrically connected to the second terminal; the first terminal; the second terminal; the first light emitting element group. And a substrate on which the second light emitting element group is disposed, wherein the first light emitting element group and the second light emitting element group include at least a part of the first light emitting element group and the second light emitting element group. Of at least a portion of the light emitting device arranged along one direction on the substrate The Configure least one column, in the light-emitting element array, the first light emitting element and the second light emitting elements are arranged alternately one by one or a predetermined number.

  A light source for illumination according to one embodiment of the present invention includes a first power receiving terminal and a second power receiving terminal that receive AC power, a light emitting device, and a light-transmitting cover that covers a light emitting side of the light emitting device. The light emitting device is a first light emitting element group in which a plurality of first light emitting elements are connected in series, and an anode end is electrically connected to the first power receiving terminal, and a cathode end is connected to the second power receiving terminal. A first light emitting element group electrically connected and a second light emitting element group in which a plurality of second light emitting elements are connected in series, the cathode end being electrically connected to the first power receiving terminal, the anode end being Comprising: a second light emitting element group electrically connected to the second power receiving terminal; the first light emitting element group; and a substrate on which the second light emitting element group is disposed, and the first light emitting element group. And the second light emitting element group includes at least a part of the first light emitting element group and One or more light emitting element rows in which at least a part of the second light emitting element group is arranged along one direction on the substrate are configured, and the first light emitting element and the second light emitting element are arranged in the light emitting element row. Are alternately arranged by a predetermined number of one or more.

  ADVANTAGE OF THE INVENTION According to this invention, the light-emitting device and the light source for illumination with which the nonuniformity of brightness was suppressed are implement | achieved.

FIG. 1 is an external perspective view showing a configuration of a lighting apparatus according to an embodiment. FIG. 2 is an external perspective view of the illumination light source according to the embodiment. FIG. 3 is a cross-sectional view of the illumination light source according to the embodiment. FIG. 4 is an external perspective view of the light emitting device according to the embodiment. FIG. 5 is a diagram illustrating a circuit configuration of the light-emitting device according to the embodiment. FIG. 6 is a diagram for explaining the interval between the light emitting elements in the light emitting element array. FIG. 7 is a diagram for explaining another example of the interval between the light emitting elements in the light emitting element array. FIG. 8 is a diagram for explaining the interval between the light emitting elements determined from the viewpoint of heat dissipation. FIG. 9 is an external perspective view of a light emitting device in which a plurality of first light emitting elements and a plurality of second light emitting elements are alternately arranged in the light emitting element array. FIG. 10 is an external perspective view of a light emitting device having a plurality of light emitting element arrays. FIG. 11 is a schematic plan view of a lighting device according to the first modification. FIG. 12 is an external perspective view of a lighting device according to the second modification.

  Hereinafter, embodiments will be specifically described with reference to the drawings. It should be noted that each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, and the overlapping description may be abbreviate | omitted or simplified.

  In the drawings of the following embodiments, the Z-axis direction is, for example, the vertical direction (vertical direction), and the Z-axis + side may be described as the upper side or the light emission side. Further, the Z-axis-side may be described as the lower side. The X-axis direction and the Y-axis direction are directions orthogonal to each other on a plane (horizontal plane) perpendicular to the Z-axis.

(Embodiment)
[Configuration of lighting device]
First, the structure of the illuminating device which concerns on embodiment is demonstrated. FIG. 1 is an external perspective view showing a configuration of a lighting apparatus according to an embodiment.

  As shown in FIG. 1, the illumination device 100 includes two illumination light sources 10 and a main body 110.

  The main body 110 is attached to the ceiling with a fixture. The main body 110 includes two sets of sockets 120 that are electrically connected to the illumination light source 10 and to which the illumination light source 10 is attached. The main body 110 can be formed by, for example, pressing an aluminum steel plate. The outer surface of the main body 110 is a reflecting surface that reflects light emitted from the illumination light source 10 toward the room.

[Configuration of light source for illumination]
Next, the configuration of the illumination light source 10 will be described. FIG. 2 is an external perspective view of the illumination light source 10. FIG. 3 is a cross-sectional view of the illumination light source 10.

  As shown in FIGS. 2 and 3, the illumination light source 10 is a straight tube LED lamp used as an alternative illumination of a straight tube fluorescent lamp. The illumination light source 10 includes a light emitting device 20, a cover 30, a first base 51, a second base 52, and an adhesive 60. Hereinafter, each component will be described in detail.

  First, the cover 30 will be described. The cover 30 is a light-transmitting cover that covers at least the light emitting side of the light emitting device 20. The cover 30 has a long cylindrical shape with the Y-axis direction as the height direction (longitudinal direction), and also functions as a housing that houses the light emitting device 20. Further, the cover 30 constitutes a part of the outline of the illumination light source 10.

  The base material of the cover 30 is, for example, glass, but may be a resin material such as polycarbonate. The cover 30 is a non-split type, but may be a split type.

  The cover 30 may have a light diffusion function for diffusing light from the light emitting device 20. Thereby, since the light emitted from the light emitting device 20 is diffused when passing through the cover 30, the brightness of the illumination light source 10 is made uniform.

  For example, a light diffusion film may be formed on at least one of the inner surface and the outer surface of the cover 30. Specifically, the light diffusion film is a milky white resin material containing a light diffusion material (fine particles) such as silica or calcium carbonate. In addition, at least one of the inside and the outside of the cover 30 may be provided with a lens structure for diffusing light, or may be provided with an uneven structure for diffusing light, or diffusing light. A dot pattern for printing may be printed. The base material of the cover 30 may include a light diffusing material.

  Next, the first base 51 and the second base 52 will be described. The first base 51 and the second base 52 are structures that are detachably attached to the socket 120 in order for the illumination light source 10 to receive power via the socket 120. Each of the first cap 51 and the second cap 52 is formed of, for example, an insulating resin. Each of the first base 51 and the second base 52 has a substantially bottomed cylindrical shape (cap shape), and the first base 51 covers one end of the cover 30 (the end on the Y axis + side), The second base 52 covers the other end of the cover 30 (end on the Y-axis side). The first base 51 and the second base 52 are, for example, a G13 base. The first base 51 has a first power receiving terminal 41, and the second base 52 has a second power receiving terminal 42.

  Each of the first power receiving terminal 41 and the second power receiving terminal 42 is formed of a set of conductive rod-shaped metal materials. The first power receiving terminal 41 and the second power receiving terminal 42 receive AC power from the outside of the illumination light source 10.

  The first power receiving terminal 41 receives AC power for causing the light emitting device 20 to emit light from the main body 110 by being attached to the socket 120 provided in the main body 110. The same applies to the second power receiving terminal 42. The first power receiving terminal 41 is, for example, a positive electrode terminal, and the second power receiving terminal 42 is, for example, a negative electrode terminal. Note that the AC power received by the first power receiving terminal 41 and the second power receiving terminal 42 is, for example, sinusoidal AC power having a frequency of 50 Hz or 60 Hz, similarly to the AC power supplied from the power system.

  As described above, the illumination light source 10 is a double-sided power supply method, but may be a single-sided power supply method. An example of the one-side power feeding type base is an L-shaped base conforming to JEL801 standardized by the Japan Electric Bulb Industry Association. In this case, one of the first power receiving terminal 41 and the second power receiving terminal 42 is a ground pin or a mounting pin that does not have a ground function.

[Light emitting device]
Next, the light emitting device 20 will be described with reference to FIGS. 4 and 5 in addition to FIGS. FIG. 4 is an external perspective view of the light emitting device 20. FIG. 5 is a diagram illustrating a circuit configuration of the light emitting device 20. In FIG. 5, an AC power supply 70 (power system) that is a power supply provided outside the light emitting device is also illustrated.

  The light emitting device 20 is a surface mount device (SMD) type light emitting module. The light emitting device 20 emits light toward the cover 30. As shown in FIG. 3, the light emitting device 20 is bonded to the inner surface of the cover 30 with an adhesive 60. The adhesive 60 is made of, for example, a silicone resin. The adhesive 60 may be cement.

  The light emitting device 20 includes a first terminal 21, a second terminal 22, a plurality of first light emitting elements 23, a plurality of second light emitting elements 24, a substrate 25, smoothing capacitors 26a and 26b, and diodes 27a and 27b. And a fuse 28. In FIG. 4, the smoothing capacitors 26 a and 26 b, the diodes 27 a and 27 b, and the fuse 28 are not shown, but these components are arranged (mounted) on the substrate 25.

  The first terminal 21 and the second terminal 22 receive AC power from the outside. The first terminal 21 and the second terminal 22 are wiring patterns formed on the substrate 25 so that the light emitting device 20 receives AC power. The first terminal 21 is electrically connected to the first power receiving terminal 41, and the second terminal 22 is electrically connected to the second power receiving terminal 42.

  The first light emitting element 23 is a so-called SMD type light emitting element in which an LED chip and a phosphor are packaged, and emits white light, for example. The first light emitting element 23 includes a package 23a, an LED 23b, and a sealing member 23c.

  The package 23a is a container molded with a non-translucent resin (white resin or the like), and includes an inverted frustoconical recess (cavity). The inner surface of the recess is an inclined surface, and reflects light emitted from the LED 23b upward.

  The LED 23b is a bare chip that emits monochromatic visible light, and is die-bonded to the bottom surface of the recess of the package 23a by a die attach material (die bond material). As the LED 23b, for example, a blue light emitting LED chip that emits blue light can be used. As the blue light emitting LED chip, for example, a gallium nitride semiconductor light emitting element having a center wavelength of 440 nm or more and 470 nm or less made of an InGaN material can be used.

  The sealing member 23c is a phosphor-containing resin including a phosphor that is a wavelength conversion material, converts the wavelength of light emitted from the LED 23b, and seals the LED 23b to protect the LED 23b. The sealing member 23c is filled in the recess of the package 23a, and is sealed up to the opening surface of the recess.

  The sealing member 23c is formed, for example, by dispersing and arranging YAG (yttrium, aluminum, garnet) -based yellow phosphor particles on a transparent silicone resin as a base material. In this case, since the yellow phosphor particles are excited by the blue light emitted from the LED 23b to emit yellow light, white light is emitted from the sealing member 23c by mixing the excited yellow light and the blue light emitted from the LED 23b. Be emitted. The sealing member 23c may further contain a light diffusing material such as silica.

  The plurality of first light emitting elements 23 are arranged (mounted) on the substrate 25 and are connected in series by a wiring 25 a formed on the substrate 25. The total number of the plurality of first light emitting elements 23 is, for example, about 30, but may be two or more. Hereinafter, the plurality of first light emitting elements 23 connected in series are also referred to as a first light emitting element group. The anode end of the first light emitting element group is electrically connected to the first terminal 21, and the cathode end of the first light emitting element group is electrically connected to the second terminal 22.

  The second light emitting element 24 is an SMD type light emitting element of the same kind as the first light emitting element 23 (substantially the same as an industrial product). That is, the color and brightness of light emitted from the first light emitting element 23 are substantially the same as the color and brightness of light emitted from the second light emitting element 24. The second light emitting element 24 is different from the first light emitting element 23 in the timing of light emission based on AC power. In the following embodiments, the term light emitting element is used to mean either the first light emitting element 23 or the second light emitting element 24. Since the detailed configuration of the second light emitting element 24 is the same as that of the first light emitting element 23, the description thereof is omitted. In FIG. 4, the second light emitting element 24 is expressed in a darker color than the first light emitting element 23 in order to clarify the arrangement of the first light emitting element 23 and the second light emitting element 24.

  The plurality of second light emitting elements 24 are arranged (mounted) on the substrate 25 and connected in series by the wiring 25 a formed on the substrate 25. The total number of the plurality of second light emitting elements 24 is, for example, about 30, but may be two or more. Hereinafter, the plurality of second light emitting elements 24 connected in series are also referred to as a second light emitting element group. The cathode end of the second light emitting element group is electrically connected to the first terminal 21, and the anode end of the second light emitting element group is electrically connected to the second terminal 22.

  The first light emitting element group and the second light emitting element group are structurally arranged in one row. In other words, the first light emitting element group and the second light emitting element group are arranged along one direction (predetermined direction) on the substrate 25 to constitute one light emitting element row. The arrangement of the first light emitting element 23 and the second light emitting element 24 in the light emitting element array will be described later. In the light emitting element row, the total number of the plurality of second light emitting elements 24 included in the second light emitting element group is the same as the total number of first light emitting elements 23 included in the first light emitting element group.

  The substrate 25 is a mounting substrate for mounting the first light emitting element group and the second light emitting element group, at least the upper surface (first main surface) of which is made of an insulating material. The board | substrate 25 is elongate which makes the direction (Y-axis direction) the light emitting element row | line extends in a longitudinal direction. Specifically, the substrate 25 has a long rectangular plate shape with the Y-axis direction as the longitudinal direction.

  As the substrate 25, for example, a glass composite substrate (CEM-3 or the like), a glass epoxy substrate (FR-4 or the like), or a substrate made of paper phenol or paper epoxy (FR-1 or the like) is used. As the metal base substrate, for example, an aluminum alloy substrate, an iron alloy substrate, or a copper alloy substrate having an insulating film formed on the surface thereof is used.

  A first terminal 21, a second terminal 22, a first light emitting element group, and a second light emitting element group are disposed (mounted) on the upper surface of the substrate 25. The upper surface of the substrate 25 is covered with a cover 30. The lower surface (second main surface) of the substrate 25 is partially bonded to the inner surface of the cover 30 with an adhesive 60.

  The wiring 25a is a metal wiring made of tungsten (W) or copper (Cu). The wiring 25a electrically connects the plurality of first light emitting elements 23 constituting the first light emitting element group and the plurality of second light emitting elements 24 constituting the second light emitting element group. The wiring 25a electrically connects the first light emitting element group, the first terminal 21 and the second terminal 22, and electrically connects the second light emitting element group, the first terminal 21 and the second terminal 22. Connect to. The wiring 25a is patterned in a predetermined shape.

  The smoothing capacitors 26 a and 26 b are capacitors for smoothing the AC power supplied to the first terminal 21 and the second terminal 22.

  The diode 27 a is a rectifying element that performs rectification so that current does not flow through the first light emitting element group during a period in which the potential of the first terminal 21 is lower than the potential of the second terminal 22. The diode 27 b is a rectifying element that performs rectification so that current does not flow through the second light emitting element group in a period in which the potential of the first terminal 21 is higher than the potential of the second terminal 22.

  The fuse 28 is a protective element that protects the circuit shown in FIG. 5 by opening the circuit when an overcurrent flows.

  The circuit components such as the smoothing capacitors 26a and 26b, the diodes 27a and 27b, and the fuse 28 described above are not essential. In addition to the circuit components described above, a resistor or the like may be disposed on the substrate 25.

  The light emitting device 20 converts the AC power supplied to the first terminal 21 and the second terminal 22 into DC power, and the AC power supplied to the first terminal 21 and the second terminal 22 to full wave. No rectifying circuit is provided. In the light emitting device 20, AC power supplied to the first terminal 21 and the second terminal 22 is directly applied to the first light emitting element group and the second light emitting element group. This simplifies the circuit configuration.

[Arrangement of light emitting elements on substrate]
Next, the arrangement of the light emitting elements on the substrate 25 will be described with reference to FIG. As shown in FIG. 4, the first light emitting element group and the second light emitting element group are arranged along one direction on the substrate 25 to constitute one light emitting element row. Specifically, the first light emitting element group and the second light emitting element group are arranged along a straight line extending in the Y-axis direction on the substrate 25 to constitute one linear light emitting element array.

  As described above, the light emitting device 20 emits light when AC power is supplied. As described above, the anode end of the first light emitting element group is electrically connected to the first terminal 21, and the cathode end of the first light emitting element group is electrically connected to the second terminal 22. For this reason, the first light emitting element 23 emits light in a period in which the potential of the first terminal 21 is higher than the potential of the second terminal 22. Similarly, the cathode end of the second light emitting element group is electrically connected to the first terminal 21, and the anode end of the second light emitting element group is electrically connected to the second terminal 22. For this reason, the second light emitting element 24 emits light during a period in which the potential of the first terminal 21 is lower than the potential of the second terminal 22.

  As described above, the first light emitting element 23 and the second light emitting element 24 emit light alternately in an instant. Therefore, if the first light emitting element 23 is biased and the second light emitting element 24 is biased on the substrate 25, the brightness becomes instantaneously uneven, giving the user a sense of incongruity. May end up. In particular, when the illumination device 100 (the illumination light source 10 or the light emitting device 20) is used for a long time, there is a possibility that the user may feel uncomfortable.

  Therefore, in the light emitting element array included in the light emitting device 20, the first light emitting elements 23 and the second light emitting elements 24 are alternately arranged one by one. Thereby, the light-emitting device 20 and the illumination light source 10 or the illumination device 100 including the light-emitting device 20 can suppress instantaneous unevenness of brightness, and can reduce a sense of discomfort given to the user.

  In the light emitting device 20, one light emitting element array in which all of the first light emitting element group and all of the second light emitting element group are arranged along one direction on the substrate 25 is configured. However, the first light emitting element group and the second light emitting element group may be arranged in a plurality of rows on the substrate 25. That is, the first light emitting element group and the second light emitting element group include two light emitting element arrays in which a part of the first light emitting element group and a part of the second light emitting element group are arranged along one direction on the substrate 25. You may comprise more than a row. The first light-emitting element group and the second light-emitting element group include a light-emitting element array in which at least a part of the first light-emitting element group and at least a part of the second light-emitting element group are arranged along one direction on the substrate 25. What is necessary is just to comprise more than a line.

[Spacing 1 of light emitting elements]
The light emitting element array included in the light emitting device 20 emits light toward the cover 30, and the first light emitting element 23 and the second light emitting element 24 constituting the light emitting element array emit light alternately in an instant. Here, in the illumination light source 10, the light emitted from the light emitting element array in both the period in which only the first light emitting element 23 emits light and the period in which only the second light emitting element 24 emits light. It is better to irradiate the entire cover 30 as much as possible.

  Therefore, in the light emitting device 20, the interval between the light emitting elements is determined so that the light emitted from the light emitting element array is irradiated to the entire cover 30 as much as possible. FIG. 6 is a diagram for explaining the interval between the light emitting elements in the light emitting element array.

  Generally, the light distribution angle of light emitting elements (LED elements) such as the first light emitting element 23 and the second light emitting element 24 is 120 °. Then, as shown in FIG. 6, in order for the light emitted from the light emitting device 20 to irradiate the entire inner surface of the cover 30 without interruption during the period in which only the first light emitting element 23 emits light, the light emitting element array The distance x between the adjacent light emitting elements in FIG. 3 may satisfy the following formula 1 where L is the distance between the light emitting element array and the cover 30. Note that the interval x is more specifically the distance from the center position of one light emitting element to the center position of another light emitting element adjacent to the one light emitting element in the Y-axis direction. Specifically, the distance between the light emitting element array and the cover 30 is a distance from the light emission center of the light emitting element to the inner surface of the cover 30 in the Z-axis direction.

  If the interval x between the adjacent light emitting elements satisfies the above formula 1, the light emitting device 20 is used in both the period in which only the first light emitting element 23 emits light and the period in which only the second light emitting element 24 emits light. Is emitted to the entire cover 30 without interruption. Therefore, the light-emitting device 20 and the illumination light source 10 or the illumination device 100 including the light-emitting device 20 can suppress uneven brightness, and can reduce a sense of discomfort given to the user.

  The interval x between the light emitting elements is an example, and is not particularly limited. FIG. 7 is a diagram for explaining another example of the interval x between the light emitting elements in the light emitting element array.

  In the example of FIG. 7, more uniform light can be obtained than in the example of FIG. As illustrated in FIG. 7, the interval x may satisfy the following Expression 2, for example.

  If the interval x satisfies such a formula, an arbitrary position on the inner surface of the cover 30 is either a period during which only the first light emitting element 23 emits light or a period during which only the second light emitting element 24 emits light. In FIG. 2, light is irradiated by at least two light emitting elements. Therefore, the light emitting device 20 and the illumination light source 10 or the illumination device 100 including the light emitting device 20 can emit light with sufficiently uniform brightness.

  Note that the interval x may be determined from the viewpoint of heat dissipation. FIG. 8 is a diagram for explaining the interval between the light emitting elements determined from the viewpoint of heat dissipation.

  Generally, the spread angle of radiant heat when light emitting elements (LED elements) such as the first light emitting element 23 and the second light emitting element 24 emit light is 90 ° centering on the heat source (light emitting point). Then, as shown in FIG. 8, the interval x for suppressing the overlap of radiant heat between adjacent light emitting elements in the substrate 25 may be x ≧ 2t, where t is the thickness of the substrate 25.

  If the interval x satisfies x ≧ 2t, the light emitting device 20 and the illumination light source 10 or the illumination device 100 including the light emitting device 20 can efficiently emit light while suppressing overlapping of radiant heat of adjacent light emitting elements in the substrate 25. it can.

[Modification of Light Emitting Device]
In the light emitting element array included in the light emitting device 20, the first light emitting elements 23 and the second light emitting elements 24 are alternately arranged one by one. However, in the light emitting element array, the first light emitting elements 23 and the second light emitting elements are arranged. 24 may be arranged alternately by a predetermined number of one or more. That is, in the light emitting element array, the first light emitting elements 23 and the second light emitting elements 24 may be alternately arranged in a plurality (two or more predetermined numbers). FIG. 9 is an external perspective view of a light emitting device in which a plurality of first light emitting elements 23 and a plurality of second light emitting elements 24 are alternately arranged in the light emitting element array.

  In the light emitting element array included in the light emitting device 20a shown in FIG. 9, two first light emitting elements 23 and two second light emitting elements 24 are alternately arranged. Since the light emitting device 20a and the illumination light source 10 or the illumination device 100 including the light emission device 20a can suppress instantaneous nonuniform brightness, it is possible to reduce a sense of discomfort given to the user. In addition, when the 1st light emitting element 23 and the 2nd light emitting element 24 are alternately arrange | positioned by two or more predetermined number, the said predetermined number is the number of about 2-3 pieces (three or less). Good.

  The light emitting device 20 may have a plurality of light emitting element arrays. FIG. 10 is an external perspective view of a light emitting device having a plurality of light emitting element arrays.

  The light-emitting device 20b shown in FIG. 10 has two light-emitting element arrays that extend in the Y-axis direction (first direction) on the substrate 25. The two light emitting element rows are arranged side by side in the X axis direction (second direction) intersecting the Y axis direction. In other words, a plurality of light emitting elements are arranged in a matrix on the substrate 25. Each of the two light emitting element arrays has the same configuration as the light emitting element array included in the light emitting device 20.

  Similar to the light emitting device 20, in each of the two light emitting element rows of the light emitting device 20b, the first light emitting elements 23 and the second light emitting elements 24 are alternately arranged in the Y-axis direction. Further, when one of the two light emitting elements arranged in the X-axis direction is the first light emitting element 23, the other is not the first light emitting element 23 but the second light emitting element 24. That is, in the light emitting device 20b, the first light emitting elements 23 and the second light emitting elements 24 are alternately arranged one by one not only in the Y axis direction but also in the X axis direction.

  Such a light-emitting device 20b and an illumination light source or an illumination device including the light-emitting device 20b can suppress instantaneous unevenness of brightness, and can reduce a sense of discomfort given to the user.

[Modification 1 of Lighting Device]
Hereinafter, the modification 1 of an illuminating device is demonstrated. FIG. 11 is a schematic plan view of a lighting device according to the first modification.

  The main body 110a included in the lighting device 100a shown in FIG. 11 is similar in appearance to the main body 110, but the circuit connection structure (circuit configuration, connection) regarding the socket is different. Note that each of the illumination light sources 10m and 10n included in the illumination device 100a has the same configuration as the illumination light source 10.

  The socket 120a and the socket 120b are a set of sockets to which the illumination light source 10m is attached. Here, due to the circuit connection structure (wiring or lead wire) disposed inside the main body 110a, the socket 120a located on the Y axis + side has one terminal (for example, a hot polarity terminal) of the AC power supply 70. The socket 120b is electrically connected to the other side of the AC power supply 70 (for example, a terminal having a cold polarity) on the Y axis minus side.

  The socket 120c and the socket 120d are a set of sockets to which another illumination light source 10n is attached. Here, due to the circuit connection structure inside the main body 110a, the socket 120c located on the Y axis + side is electrically connected to the other terminal of the AC power supply 70, and the socket 120d on the Y axis − side is connected to the AC power supply 70. One of the terminals is electrically connected.

  According to such connection, when one of the two light emitting elements arranged in the X-axis direction is the first light emitting element 23, the other is not the first light emitting element 23 but the second light emitting element 24. In other words, of the light emitting elements included in the illumination light source 10m and the illumination light source 10n, two light emitting elements having the same position in the Y axis direction (two light emitting elements arranged in the X axis direction) emit light at different timings. .

  Thus, in the illumination device 100a, the first light emitting elements 23 and the second light emitting elements 24 are alternately arranged one by one not only in the Y axis direction but also in the X axis direction. Therefore, the illuminating device 100a can suppress instantaneous nonuniformity of brightness, and can reduce a sense of discomfort given to the user.

[Modification 2 of Lighting Device]
The configuration of the illumination device 100 (illumination light source 10) described in the above embodiment is an example. For example, in the above embodiment, the illumination light source 10 is attached to the main body 110 by the first base 51 and the second base 52, but the illumination light source 10 may be attached to the main body 110 by a connector. . Hereinafter, the illumination device according to Modification 2 will be described. FIG. 12 is an external perspective view of a lighting device according to the second modification.

  As shown in FIG. 12, the illumination device 200 includes an illumination light source 10 a and a main body 210.

  The main body 210 is attached to the ceiling with a fixture. The main body 210 has a recess 220 into which the illumination light source 10a is fitted. For example, the illumination light source 10a is detachably attached to the main body 210 by engaging a metal fitting (not shown) of the illumination light source 10a with a hole formed in the inner surface of the recess 220. A connector 240 is provided at the end of the electric wire extending from the main body 210.

  The illumination light source 10a includes a light emitting device 20 and a housing 30a. The housing 30 a is a kamaboko-shaped housing and houses the light emitting device 20. A portion (curved portion) that covers the light emission side of the light emitting device 20 in the housing 30a is an example of a cover, and this portion is formed of a resin such as polycarbonate or a light-transmitting material such as glass. The This portion may have light diffusibility by having the light diffusion structure as described in the above embodiment.

  A connector 40 is provided at the end of the electric wire extending from the housing 30a. By fitting the connector 40 with the connector 240, it is possible to supply AC power from the main body 210 to the light emitting device 20 (illumination light source 10a). Thus, the terminals in the connector 40 include the first power receiving terminal and the second power receiving terminal that receive AC power from the outside.

  The illumination device 200 and the illumination light source 10a according to the modification have been described above, and such illumination device 200 and illumination light source 10a are also included in the present invention.

[Effects]
As described above, the light emitting device 20 is a first light emitting element group in which a first terminal 21 and a second terminal 22 that receive AC power and a plurality of first light emitting elements 23 are connected in series, and an anode end is A first light emitting element group electrically connected to the first terminal 21 and having a cathode end electrically connected to the second terminal 22. The light emitting device 20 is a second light emitting element group in which a plurality of second light emitting elements 24 are connected in series. The cathode end is electrically connected to the first terminal 21 and the anode end is connected to the second terminal 22. A second light emitting element group electrically connected, a first terminal 21, a second terminal 22, a first light emitting element group, and a substrate 25 on which the second light emitting element group is arranged. The first light-emitting element group and the second light-emitting element group include a light-emitting element array in which at least a part of the first light-emitting element group and at least a part of the second light-emitting element group are arranged along one direction on the substrate 25. In the light emitting element array, the first light emitting elements 23 and the second light emitting elements 24 are alternately arranged by a predetermined number of one or more.

  Thereby, the light-emitting device 20 can suppress nonuniform brightness. Further, the light emitting device 20 can reduce a sense of discomfort given to the user.

  The light emitting element array emits light toward the cover 30 having translucency, and the first light emitting element 23 and the second light emitting element 24 may be alternately arranged one by one in the light emitting element array. . The distance x between adjacent light emitting elements in the light emitting element array may satisfy the relationship expressed by the above formula 1, where L is the distance between the light emitting element array and the cover 30.

  Thereby, the light emitted from the light emitting device 20 is irradiated on the entire cover 30 in both the period in which only the first light emitting element 23 emits light and the period in which only the second light emitting element 24 emits light. . Therefore, the light-emitting device 20 can suppress uneven brightness and can reduce a sense of discomfort given to the user.

  The light emitting element array emits light toward the cover 30 having translucency, and the first light emitting element 23 and the second light emitting element 24 may be alternately arranged one by one in the light emitting element array. . The distance x between adjacent light emitting elements in the light emitting element array may satisfy the relationship expressed by the above equation 2 where L is the distance between the light emitting element array and the cover 30.

  As a result, any position of the cover 30 is lightened by at least two light emitting elements in both the period in which only the first light emitting element 23 emits light and the period in which only the second light emitting element 24 emits light. Is irradiated. Therefore, the light emitting device 20 can emit light with sufficient uniformity.

  Further, the interval x between adjacent light emitting elements in the light emitting element array may be x ≧ 2t, where t is the thickness of the substrate 25.

  As a result, the light emitting device 20 can efficiently emit light while suppressing the overlapping of radiant heat of adjacent light emitting elements in the substrate 25.

  The substrate 25 may have a long shape with the one direction as a longitudinal direction.

  Thereby, the elongate light-emitting device 20 is realizable.

  The illumination light source 10 includes a first power receiving terminal 41 and a second power receiving terminal 42 that receive AC power, the light emitting device 20, and a light-transmitting cover 30 that covers the light emitting side of the light emitting device 20. Prepare.

  Thereby, the light source 10 for illumination can suppress the nonuniformity of brightness. Further, the light emitting device 20 can reduce a sense of discomfort given to the user.

  In the illumination light source 10, the light emitting element array and the cover 30 may satisfy the relationship represented by the above formula 1 or the relationship represented by the above formula 2.

(Other embodiments)
Although the light emitting device, the illumination light source, and the illumination device according to the embodiments have been described above, the present invention is not limited to such an embodiment.

  For example, in the above embodiment, the light emitting device used for the straight tube LED lamp has been described. However, the present invention may be realized as a light-emitting device used for another illumination light source such as a light bulb shaped lamp, or another illumination device such as a downlight or a light source integrated illumination device in which the light source cannot be removed. You may implement | achieve as a light-emitting device used for. In addition, the shape of the substrate included in the light-emitting device used in another illumination light source and another illumination device may be determined as appropriate. That is, the shape of the substrate is not limited to a long shape.

  Moreover, in the said embodiment, the SMD type LED element was used as a light emitting element. However, a semiconductor light emitting element such as a semiconductor laser, or a solid light emitting element such as an organic EL (Electro Luminescence) or an inorganic EL may be used as the light emitting element.

  Moreover, in the said embodiment, although the light-emitting device was a SMD type, a light-emitting device may be a COB (Chip On Board) type.

  In the above embodiment, all of the light-emitting elements included in the lighting device are arranged on one substrate. However, the light-emitting elements included in the lighting device may be divided into a plurality of substrates.

  In the above embodiment, the light emitting device emits white light using an LED that emits blue light and a phosphor-containing resin containing yellow phosphor particles, but the light emitting device is limited to such a configuration. Is not to be done. The light emitting device may emit white light using, for example, an LED that emits blue light and a phosphor-containing resin that contains red phosphor particles and green phosphor particles.

  Further, instead of an LED that emits blue light, an LED that emits light other than blue light may be used. The light emitting device emits white light using, for example, an LED chip that emits ultraviolet light and a phosphor-containing resin containing phosphor particles that are excited by ultraviolet light and emit light in three primary colors (red, green, and blue). May be. For the light emitting device, a wavelength conversion material other than the phosphor particles may be used. For example, as the wavelength conversion material, a semiconductor, a metal complex, an organic dye, a pigment, and the like absorb light of a certain wavelength, A material containing substances that emit light of different wavelengths may be used.

  As mentioned above, although the light-emitting device, the light source for illumination, and the illuminating device which concern on one or several aspects were demonstrated based on embodiment and a modified example, this invention is limited to the said embodiment and modified example. It is not a thing. Unless it deviates from the gist of the present invention, various modifications conceived by those skilled in the art have been made in this embodiment, and forms constructed by combining components in different embodiments are also within the scope of one or more aspects. May be included.

10, 10a, 10m, 10n Illumination light source 20, 20a, 20b Light emitting device 21 First terminal 22 Second terminal 23 First light emitting element 24 Second light emitting element 25 Substrate 30 Cover 41 First power receiving terminal 42 Second power receiving terminal

Claims (8)

A first terminal and a second terminal for receiving AC power;
A first light emitting element group in which a plurality of first light emitting elements are connected in series, wherein an anode end is electrically connected to the first terminal, and a cathode end is electrically connected to the second terminal. A light emitting element group;
A second light emitting element group in which a plurality of second light emitting elements are connected in series, wherein a cathode end is electrically connected to the first terminal, and an anode end is electrically connected to the second terminal. A light emitting element group;
The first terminal, the second terminal, the first light emitting element group, and a substrate on which the second light emitting element group is disposed,
In the first light emitting element group and the second light emitting element group, at least a part of the first light emitting element group and at least a part of the second light emitting element group are arranged along one direction on the substrate. Configure one or more element rows,
In the light emitting element array, the first light emitting element and the second light emitting element are alternately arranged by a predetermined number of one or more. The light emitting element array emits light toward a cover having translucency,
In the light emitting element row, the first light emitting elements and the second light emitting elements are alternately arranged one by one,
An interval x between adjacent light emitting elements in the light emitting element row is defined as L is a distance between the light emitting element row and the cover.

The light-emitting device according to claim 1. The light emitting element array emits light toward a cover having translucency,
In the light emitting element row, the first light emitting elements and the second light emitting elements are alternately arranged one by one,
An interval x between adjacent light emitting elements in the light emitting element row is defined as L is a distance between the light emitting element row and the cover.

The light-emitting device according to claim 1. The light-emitting device according to claim 1, wherein an interval x between adjacent light-emitting elements in the light-emitting element array is x ≧ 2t, where t is a thickness of the substrate. The light emitting device according to claim 1, wherein the substrate has a long shape with the one direction as a longitudinal direction. A first power receiving terminal and a second power receiving terminal that receive AC power;
A light emitting device;
A light-transmitting cover that covers the light emitting side of the light-emitting device;
The light emitting device
A first light-emitting element group in which a plurality of first light-emitting elements are connected in series, with an anode end electrically connected to the first power receiving terminal and a cathode end electrically connected to the second power receiving terminal. A first light emitting element group;
A second light emitting element group in which a plurality of second light emitting elements are connected in series, with a cathode end electrically connected to the first power receiving terminal and an anode end electrically connected to the second power receiving terminal. A second light emitting element group;
A substrate on which the first light emitting element group and the second light emitting element group are disposed;
In the first light emitting element group and the second light emitting element group, at least a part of the first light emitting element group and at least a part of the second light emitting element group are arranged along one direction on the substrate. Configure one or more element rows,
In the light emitting element array, the first light emitting element and the second light emitting element are alternately arranged in a predetermined number of one or more. In the light emitting element row, the first light emitting elements and the second light emitting elements are alternately arranged one by one,
An interval x between adjacent light emitting elements in the light emitting element row is defined as L is a distance between the light emitting element row and the cover.

The illumination light source according to claim 6. In the light emitting element row, the first light emitting elements and the second light emitting elements are alternately arranged one by one,
An interval x between adjacent light emitting elements in the light emitting element row is defined as L is a distance between the light emitting element row and the cover.

The illumination light source according to claim 6.

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