WO2014162460A1 - Light-emitting device - Google Patents

Abstract

A light-emitting device (100) comprises a light-emitting element (2) and a fixed plate (3), to one surface of which the light-emitting element (2) is fixed. A recess-protrusion structure (4) including at least either one of a recess portion and a protrusion portion is formed on the surface of the fixed plate (3) opposite to the surface to which the light-emitting element (2) is fixed. The recess-protrusion structure (4) has n-fold symmetry with respect to a rotational center axis (31) that passes through the center (32) of the fixed plate (3) when viewing the fixed plate (3) in a direction orthogonal thereto and is orthogonal to the fixed plate (3). The outer shape of the fixed plate (3) has m-fold symmetry with respect to the rotational center axis (31). Here n and m are relatively prime integers.

Description

Light emitting device

The present invention relates to a light emitting device.

As a technique for attaching a panel-like light emitting device to an attachment base member such as a housing shape, there is a technique described in Patent Document 1, for example.

In Patent Document 1, a light-emitting device having a power supply terminal, a power supply unit that contacts the power supply terminal and supplies power to the light-emitting device via the power supply terminal, and holds the light-emitting device and the power supply terminal of the light-emitting device. A lighting fixture is described that includes an attachment base member that elastically contacts a power feeding portion.

Note that Patent Document 2 describes that at least two terminals are provided along each side of the light-emitting device so that the direction of the light-emitting element when mounted on the mounting base member is not limited.

JP 2009-76388 A JP 2011-243460 A

In the case of the technique of Patent Document 1, the angle of the light emitting device around the rotation center axis that passes through the center of the panel-shaped light emitting device and is orthogonal to the light emitting device is arranged at a predetermined rotation angle with respect to the mounting base member. It seems that the light-emitting device can be attached to the attachment base member at any time and when it is rotated 180 degrees from the predetermined rotation angle. For this reason, there is a possibility that the light emitting device is attached to the attachment base member in an incorrect manner.

The problem to be solved by the present invention is that the light emitting device can be attached to the mounting base member only when the rotation angle of the panel-shaped light emitting device with respect to the mounting base member is set to a unique angle. An example is given below.

The invention according to claim 1 is a light emitting device;
A fixing plate in which the light emitting element is fixed to one surface;
With
A concavo-convex structure including at least one of a concave portion and a convex portion is formed on a surface opposite to the surface on which the light emitting element is fixed in the fixing plate,
The concavo-convex structure is n-fold symmetric with respect to a rotation center axis passing through the center of the fixed plate when viewed in the direction orthogonal to the fixed plate and orthogonal to the fixed plate. ,
The outer shape of the fixed plate is m-fold symmetric with respect to the rotation center axis,
n and m are light emitting devices which are relatively prime integers.

The above-described object and other objects, features, and advantages will be further clarified by a preferred embodiment described below and the following drawings attached thereto.

1A is a side sectional view showing a state before the light emitting device according to the embodiment is attached to the mounting base member, and FIG. 1B is a side showing the state where the light emitting device according to the embodiment is attached to the mounting base member. It is sectional drawing. It is a top view of the light-emitting device concerning an embodiment. It is a top view of the attachment base member to which the light-emitting device which concerns on embodiment is attached. It is sectional drawing which shows an example of the structure of an organic EL element in case a light emitting element is an organic EL element. It is sectional drawing which shows the 1st example of the layer structure of an organic functional layer. It is sectional drawing which shows the 2nd example of the layer structure of an organic functional layer. 7A is a side sectional view showing a state before the light emitting device according to the first embodiment is attached to the mounting base member, and FIG. 7B is a state where the light emitting device according to the first embodiment is attached to the mounting base member. FIG. 7C is a block diagram of the light emitting device according to the first embodiment. 6 is a plan view of a light emitting device according to Example 2. FIG. FIG. 9A is a plan view of the light emitting device according to Example 3, and FIG. 9B is a cross-sectional view taken along line BB of FIG. 9A. 6 is a plan view of a light emitting device according to Example 4. FIG. 11A is a plan view of the light emitting device according to Reference Example 1, and FIG. 11B is a plan view of the light emitting device according to Reference Example 2. 12A to 12E are plan views of light emitting devices according to Comparative Examples 1 to 5. FIG.

Hereinafter, embodiments will be described with reference to the drawings. In all the drawings, the same components are denoted by the same reference numerals, and description thereof will be omitted as appropriate.

FIG. 1A is a side sectional view showing a state before the light emitting device 100 according to the embodiment is attached to the mounting base member 1, and FIG. 1B is a diagram showing the light emitting device 100 according to the embodiment attached to the mounting base member 1. It is a sectional side view which shows a state. FIG. 2 is a plan view of the light emitting device 100 according to the embodiment. FIG. 3 is a plan view of the mounting base member 1 to which the light emitting device 100 according to the embodiment is mounted. 1A and 1B are cross-sectional views taken along the line AA in FIGS. The light emitting device 100 can be used as a light source of, for example, a display, a lighting device, or an optical communication device.

The light emitting device 100 according to this embodiment includes a light emitting element 2 and a fixing plate 3 on which the light emitting element 2 is fixed to one surface. A concavo-convex structure 4 including at least one of a concave portion and a convex portion is formed on the surface of the fixing plate 3 opposite to the surface on which the light emitting element 2 is fixed. The concavo-convex structure 4 is n-fold symmetric with respect to a rotation center axis 31 passing through the center 32 of the fixed plate 3 when viewed in the direction orthogonal to the fixed plate 3 and orthogonal to the fixed plate 3. (The rotational symmetry of the concavo-convex structure 4 with respect to the rotation center axis 31 is n-fold symmetry). The outer shape of the fixed plate 3 is m-fold symmetric with respect to the rotation center axis 31 (the rotational symmetry of the outer shape of the fixed plate 3 with respect to the rotation center axis 31 is m-fold symmetry). N and m are relatively prime integers.
In other words, the rotational symmetry of the concavo-convex structure 4 with respect to the rotation center axis 31 and the rotational symmetry of the outer shape of the fixed plate 3 with respect to the rotation center axis 31 are different from each other, and the light emitting device 100. Is rotated around the rotation center axis 31, before the rotation of 360 °, the outer shape of the fixing plate 3 and the concavo-convex structure 4 do not overlap with each other before the rotation.
In other words, when the concavo-convex structure 4 is rotated by (360 / n) ° around the rotation center axis 31, the concavo-convex structure 4 has a shape that overlaps with itself before the rotation. When (360 / m) ° is rotated around 31, the shape overlaps itself before rotation, and the least common multiple of (360 / n) and (360 / m) is 360.

Hereinafter, in order to simplify the description, the description will be made assuming that the positional relationship (vertical relationship, etc.) of each component of the light emitting device 100 and the mounting base member 1 is the relationship shown in each drawing. However, the positional relationship in this description is irrelevant to the positional relationship when the light emitting device 100 and the mounting base member 1 are used.

The light emitting device 100 is formed in a flat panel shape. As an example, the planar shape of the light emitting device 100 may be a rectangular shape, but may be other polygonal shapes (pentagonal, hexagonal, etc.), oval, oval, etc. However, the circular shape is excluded as the planar shape of the light emitting device 100.

The planar shape of the fixing plate 3 is the same as the planar shape of the light emitting device 100. That is, the planar shape of the fixed plate 3 is a m-fold symmetric shape such as a rectangular shape, other polygonal shapes, an ellipse, or an oval. As a planar shape of the fixing plate 3, a circle is excluded.

1 and 2 show examples in which the planar shape of the light emitting device 100 is a square. Hereinafter, in the present embodiment, description will be made assuming that the planar shapes of the light emitting device 100 and the fixing plate 3 are square.

The light emitting device 100 has a light emitting element 2. The light emitting element 2 is, for example, an organic EL element. However, the light emitting element 2 included in the light emitting device 100 is not limited to the organic EL element. For example, the light emitting element 2 may be configured by combining an LED (Light Emitting Diode) and a light guide plate, or may be configured by arranging a plurality of LEDs in an array. The light emitting element 2 may be an inorganic EL element or a cold cathode tube. One surface (the lower surface in FIG. 1) of the light emitting element 2 is a light emitting surface 2a that emits light.

The light emitting device 100 is configured by fixing the light emitting element 2 to one surface (the lower surface in FIG. 1) of the flat fixing plate 3. A control unit (such as a control unit 6 described later with reference to FIG. 7C) that controls the light emitting element 2 to emit light may be provided integrally with the light emitting element 2 and the fixing plate 3. The light emitting element 2 and the fixing plate 3 may be arranged separately.

The mounting base member 1 has a housing shape as shown in FIG. 1 as an example. In this case, the attachment base member 1 defines, for example, an internal space opened downward. This internal space communicates with the external space through the opening 1b. At least a part of the internal space is an installation area 1a where the light emitting device 100 is installed. In this case, the mounting base member 1 includes a top plate 11 and side wall portions 12 that hang from the peripheral edge of the top plate 11. As an example, the planar shape of the top plate 11 may be a rectangular shape, but may be other polygonal shapes (pentagonal, hexagonal, etc.), circular, elliptical, oval or the like. The lower surface 11a of the top plate 11 faces the fixed plate 3 of the light emitting device 100 in a state installed in the installation area 1a. Further, the side wall portion 12 may be formed in a frame shape (tubular shape), or may have a shape that hangs down only from a part of the peripheral edge portion of the top plate 11. Note that the planar shape of the mounting base member 1 may be similar to the planar shape of the light emitting device 100, or even if there is no correlation between the planar shape of the mounting base member 1 and the planar shape of the light emitting device 100. good. However, the fixing plate 3 can be attached to the mounting base member 1 only when the fixing plate 3 is in a specific direction (any one of m types of orientations) with respect to the mounting base member 1. The mounting base member 1 includes a frame surrounding the fixed plate 3 or a guide portion that guides the fixed plate 3. 1 and 3 show an example in which the mounting base member 1 has a square planar shape. In this example, the planar shape of the internal space of the mounting base member 1 is also a square.

A concavo-convex structure 5 that fits with the concavo-convex structure 4 of the fixing plate 3 is formed on the lower surface 11 a of the top plate 11 of the mounting base member 1. The concavo-convex structure 5 includes at least one of a convex portion and a concave portion.

For example, as shown in FIG. 1, the concavo-convex structure 4 includes a plurality of concave portions 41. As an example, as shown in FIG. 2, the concavo-convex structure 4 is constituted by three concave portions 41.

These recesses 41 are arranged at the vertices of an equilateral triangle, for example. In plan view, the center of this equilateral triangle coincides with the rotation center axis 31 and the center 32. For example, the concave portions 41 are circular with the same dimensions in plan view. Moreover, the depth of each recessed part 41 is mutually equal. In the present embodiment, the concavo-convex structure 4 is three-fold symmetric with respect to the rotation center axis 31. That is, the concavo-convex structure 4 overlaps with the concavo-convex structure 4 before rotation every time the concavo-convex structure 4 is rotated 120 degrees around the rotation center axis 31.

Here, as described above, in the case of the present embodiment, the planar shape of the fixing plate 3 is a square. For this reason, the outer shape of the fixed plate 3 is symmetric four times with respect to the rotation center axis 31. That is, in plan view, the outer shape of the fixed plate 3 overlaps the outer shape of the fixed plate 3 before rotation every time the fixed plate 3 is rotated 90 degrees around the rotation center axis 31.

Further, as shown in FIG. 1, for example, the concavo-convex structure 5 includes a plurality of convex portions 51. As an example, as shown in FIG. 3, the concavo-convex structure 5 is constituted by three convex portions 51. These convex portions 51 are respectively arranged at positions corresponding to the concave portions 41, and the convex portions 51 can be fitted into the concave portions 41. Each convex part 51 is a circle of the same size in plan view. The height dimension of each convex part 51 is mutually equal.

The mounting base member 1 has, for example, a square shape in a plan view. The installation area 1a in the mounting base member 1 has a square shape in plan view.
For example, if the rotation angle of the light emitting device 100 is not adjusted so that each side of the fixing plate 3 and each side wall portion 12 of the mounting base member 1 are parallel in a plan view, the light emitting device 100 is inserted into the installation region 1a. You can't do that.

In order to attach the light emitting device 100 to the attachment base member 1, not only the sides of the fixing plate 3 and the side wall portions 12 of the attachment base member 1 are parallel in a plan view, but also the relief structure 4 and the relief structure 5. The light emitting device 100 is inserted into the installation area 1a after adjusting the rotation angle of the light emitting device 100 so that the two can be fitted. That is, the rotation angle of the light emitting device 100 with respect to the mounting base member 1 is set to a unique angle, and the light emitting device 100 is inserted into the installation region 1a. Thereby, as shown in FIG. 1B, each convex portion 51 is fitted into each concave portion 41, and the concave-convex structure 4 and the concave-convex structure 5 are fitted.

Here, the light emitting device 100 cannot be attached to the mounting base member 1 unless the rotation angle of the panel-shaped light emitting device 100 with respect to the mounting base member 1 is set to a unique angle. This is because the light emitting device 100 cannot be inserted into the installation area 1a or the concavo-convex structure 4 and the concavo-convex structure 5 do not fit in cases other than this unique angle.

The attachment base member 1 has a fixing portion (not shown) for fixing the attachment base member 1 to the light emitting device 100 when the light emitting device 100 is attached to the attachment base member 1. . Thereby, while being able to maintain the uneven structure 4 and the uneven structure 5 in the mutually fitted state, the light-emitting device 100 can be maintained in the state attached to the attachment base member 1. The method for fixing the light emitting device 100 to the mounting base member 1 is not particularly limited. For example, locking or screwing may be used, and the mounting base member 1 may have a holding member that holds the light emitting device 100. Further, when the light emitting device 100 is attached to the attachment base member 1, the light emitting device 100 may or may not contact the light emitting device 100 and the top plate 11 or the side wall portion 12 of the attachment base member 1. good.

FIG. 4 is a cross-sectional view showing an example of the structure of the organic EL element when the light emitting element 2 is an organic EL element. The organic EL element includes, for example, a translucent substrate 110, a translucent first electrode 130, an organic functional layer 140, and a second electrode 150. The first electrode 130 is disposed on one surface side (the lower surface side in FIG. 4) of the translucent substrate 110. The organic functional layer 140 is disposed on the opposite side (lower side in FIG. 4) from the translucent substrate 110 with respect to the first electrode 130. The second electrode 150 is disposed on the opposite side (lower side in FIG. 4) from the first electrode 130 with respect to the organic functional layer 140. Note that the translucent substrate 110 and the first electrode 130 may be in contact with each other, or another layer may exist between them. Similarly, the first electrode 130 and the organic functional layer 140 may be in contact with each other, or another layer may exist between them. Similarly, the organic functional layer 140 and the second electrode 150 may be in contact with each other, or other layers may exist between them. Further, a sealing layer may be formed on the lower surface of the second electrode 150 as necessary.

The translucent substrate 110 is a plate-like member made of a translucent material such as glass or resin. For example, the upper surface of the translucent substrate 110, that is, the surface of the translucent substrate 110 opposite to the organic functional layer 140 is a flat light extraction surface (the light emitting surface 2a). This light extraction surface is in contact with air (refractive index 1) filling the light emission space. Note that a light extraction film such as a light diffusion film is attached to the upper surface of the translucent substrate 110, and the upper surface of the light extraction film constitutes a light extraction surface (the light emitting surface 2a). good.

The first electrode 130 may be a transparent electrode made of a metal oxide conductor such as ITO (Indium Tin Oxide) or IZO (Indium Zinc Oxide). However, the first electrode 130 may be a metal thin film that is thin enough to transmit light. The organic functional layer 140 includes at least a light emitting layer. The second electrode 150 is a reflective electrode made of a metal film such as Al or Ag. The second electrode 150 reflects light traveling from the organic functional layer 140 toward the second electrode 150 toward the translucent substrate 110.

When a voltage is applied between the first electrode 130 and the second electrode 150, the light emitting layer of the organic functional layer 140 emits light. The translucent substrate 110, the first electrode 130, and the organic functional layer 140 all transmit at least part of the light emitted from the light emitting layer of the organic functional layer 140. Part of the light emitted from the light emitting layer is emitted (extracted) from the light extraction surface of the light-transmitting substrate 110 to the outside of the light emitting device 100 (that is, the light emission space).

The emission color of the light emitting device 100, that is, the emission spectrum (the wavelength spectrum of the emitted light) is not particularly limited. The light emitting device 100 may have a structure capable of changing the light emission color to various colors, or may always emit light in a single color such as white. In addition, the light emitting device 100 may be divided into a plurality of regions and set to different emission colors for each region.

Hereinafter, an example of the layer structure of the organic functional layer 140 will be described.

FIG. 5 is a cross-sectional view showing a first example of the layer structure of the organic functional layer 140. The organic functional layer 140 has a structure in which a hole injection layer 141, a hole transport layer 142, a light emitting layer 143, an electron transport layer 144, and an electron injection layer 145 are stacked in this order. That is, the organic functional layer 140 is an organic electroluminescence light emitting layer. Note that instead of the hole injection layer 141 and the hole transport layer 142, one layer having the functions of these two layers may be provided. Similarly, instead of the electron transport layer 144 and the electron injection layer 145, one layer having the functions of these two layers may be provided.

The light emitting layer 143 is, for example, a layer that emits red light, a layer that emits blue light, or a layer that emits green light. In this case, in a plan view, a region having a light emitting layer 143 that emits red light, a region having a light emitting layer 143 that emits green light, and a region having a light emitting layer 143 that emits blue light are repeatedly provided. May be. In this case, when each region emits light simultaneously, the light emitting device 100 emits light in a single light emission color such as white. Further, it may be possible to emit light in various light spectra by performing control for adjusting the balance of the light amounts of the red, green, and blue regions.

Note that the light emitting layer 143 may be configured to emit light in a single light emission color such as white by mixing materials for emitting a plurality of colors.

FIG. 6 is a cross-sectional view showing a second example of the layer structure of the organic functional layer 140. The light emitting layer 143 of the organic functional layer 140 has a structure in which light emitting layers 143a, 143b, and 143c are stacked in this order. The light emitting layers 143a, 143b, and 143c emit light of different colors (for example, red, green, and blue). The light emitting layers 143a, 143b, and 143c emit light at the same time, so that the light emitting device emits light in a single emission color such as white. Further, by performing control for adjusting the balance of the light amounts of the red, green, and blue light emitting layers 143a, 143b, and 143c, light emission in various light spectra can be performed.

According to the present embodiment, the light emitting device 100 includes the light emitting element 2 and the fixing plate 3 on which the light emitting element 2 is fixed to one surface. A concavo-convex structure 4 including at least one of a concave portion and a convex portion is formed on the surface of the fixing plate 3 opposite to the surface on which the light emitting element 2 is fixed. The concavo-convex structure 4 is n-fold symmetric with respect to a rotation center axis 31 passing through the center 32 of the fixed plate 3 when viewed in the direction orthogonal to the fixed plate 3 and orthogonal to the fixed plate 3. It is. The outer shape of the fixed plate 3 is m-fold symmetric with respect to the rotation center axis 31. N and m are relatively prime integers. Thus, the light emitting device 100 can be attached to the attachment base member 1 only when the rotation angle of the light emitting device 100 with respect to the attachment base member 1 is set to a unique angle. Thereby, it can suppress that the light-emitting device 100 is attached to the attachment base member 1 by the wrong attachment method.

(Example 1)
7A is a side sectional view showing a state before the light emitting device 100 according to this embodiment is attached to the mounting base member 1, and FIG. 7B is a side sectional view showing the light emitting device 100 according to this embodiment as the mounting base member 1. FIG. FIG. 7C is a block diagram of the light emitting device 100 according to this embodiment. The light emitting device 100 according to this example is different from the light emitting device 100 according to the above-described embodiment in the points described below, and is configured in the same manner as the light-emitting device 100 according to the embodiment in other points.

As shown in FIG. 7C, the light emitting device 100 includes a control unit 6 that controls the light emission of the light emitting element 2.

The concave portion 41 is reduced in diameter toward the lower side. In other words, the inner cross-sectional area of the recess 41 decreases toward the depth direction of the recess 41. The fixed plate 3 has a terminal 411 exposed in the recess 41. Note that the terminal 411 may have a concavo-convex shape or may not have a concavo-convex shape (may be arranged flush with the bottom surface of the concave portion 41).

Moreover, the convex part 51 is diameter-reduced toward the downward direction. That is, the cross-sectional area of the convex portion 51 decreases toward the tip of the convex portion 51. More specifically, the convex portion 51 includes a proximal end (upper) elastic portion 512 and a distal end (lower) terminal 511. The elastic portion 512 is made of a conductive elastic body such as a metal coil spring. The terminal 511 is made of a conductor such as metal. The elastic portion 512 and the terminal 511 may be formed separately from each other and then joined to each other, or may be integrally formed with each other. The terminal 511 is reduced in diameter toward the lower side. The elastic portion 512 is electrically connected to the terminal 511 and mechanically connects the top plate 11 and the terminal 511 to each other.

The fixing plate 3 has three concave portions 41 as in the above embodiment. Among these, the terminal 411 in the first recess 41 is electrically connected to the first electrode 130 of the light emitting element 2 via a first conductive wire (not shown) formed in the fixed plate 3. Yes. In addition, the terminal 411 in the second recess 41 is electrically connected to the second electrode 150 of the light emitting element 2 via a second conductive wire (not shown) formed in the fixed plate 3. Yes. Further, the terminal 411 in the third recess 41 is electrically connected to the control unit 6 via a third conducting wire (not shown) formed in the fixed plate 3.

Further, the mounting base member 1 has three convex portions 51 as in the above embodiment. Of these, the elastic portion 512 corresponding to the terminal 511 of the first convex portion 51 and the elastic portion 512 corresponding to the terminal 511 of the second convex portion 51 are the fourth formed in the top plate 11. It is connected to a power source (not shown) via a conducting wire and a fifth conducting wire (both not shown). Further, the elastic portion 512 corresponding to the terminal 511 of the third convex portion 51 is connected to, for example, an operation portion (not shown) via a sixth conductor (not shown) formed in the top plate 11.

When the light emitting device 100 is attached to the attachment base member 1, the first convex portion 51 is in the first concave portion 41, the second convex portion 51 is in the second concave portion 41, and the third convex portion 51 is in the first concave portion 41. 3 are respectively inserted into the recesses 41. Here, since the inner cross-sectional area of the concave portion 41 becomes smaller in the depth direction of the concave portion 41, the convex portion 51 is smoothly guided into the concave portion 41. At this time, since the elastic portion 512 serves as a cushion, the impact at the time of contact between each convex portion 51 and each concave portion 41 is alleviated.

In addition, by inserting the convex portions 51 into the concave portions 41 in this way, the terminals 511 of the convex portions 51 and the terminals 411 of the concave portions 41 are in contact with each other and electrically connected to each other. Power from the power source is supplied to the first electrode 130 and the second electrode 150 via the terminal 411 of the first recess 41 and the terminal 411 of the second recess 41, respectively. As described above, in this embodiment, the recess 41 is provided with the terminal 411 for supplying power to the light emitting element 2. In addition, a signal generated by an operation on the operation unit (for example, a signal for turning on / off the light emission of the light emitting element 2) is supplied to the control unit 6 via the terminal 411 of the third recess 41. . The controller 6 controls the light emission of the light emitting element 2 based on this signal. Thus, in the case of the present embodiment, the recess 41 is provided with the terminal 411 for supplying a signal related to control to the control unit 6.

According to this example, in addition to the same effect as the above embodiment, the following effect can be obtained.

The concavo-convex structure 4 includes at least a concave portion 41, and since the inner cross-sectional area of the concave portion 41 becomes smaller in the depth direction of the concave portion 41, the convex portion 51 can be smoothly guided into the concave portion 41. .

Further, since the recess 41 is provided with a terminal 411 for supplying power to the light emitting element 2, power can be supplied from the terminal 411 to the light emitting element 2.

Further, since the recess 41 is provided with a terminal 411 for supplying a signal related to control to the control unit 6, a signal related to control can be supplied from the terminal 411 to the control unit 6.

In the present embodiment, an example in which the concave portion 41 is formed in the fixing plate 3 and the convex portion 51 is provided in the mounting base member 1 has been described. However, the concave portion in which the convex portion is formed in the fixing plate 3 and this convex portion is fitted. May be provided on the mounting base member 1. In this case, the cross-sectional area of the convex portion of the fixing plate 3 may increase toward the base end of the convex portion. By doing in this way, a convex part can be smoothly guided in the recessed part of the attachment base member 1. FIG.

(Example 2)
FIG. 8 is a plan view of the light emitting device 100 according to the second embodiment. The light-emitting device 100 according to the present example is different from the light-emitting device 100 according to the above-described embodiment or example 1 in the points described below, and the light-emitting device according to the above-described embodiment or example 1 is otherwise. The configuration is the same as that of the apparatus 100.

In the above, an example in which the concave portion 41 is circular has been described, but the concave portion 41 may have other shapes. For example, as shown in FIG. Also in the example shown in FIG. 8, the concavo-convex structure 4 is three-fold symmetric with respect to the rotation center axis 31.

On the other hand, on the lower surface 11 a of the top plate 11 of the mounting base member 1, although not shown, convex portions that are respectively fitted into the concave portions 41 are formed. And in the state which attached the light-emitting device 100 to the attachment base member 1, each convex part fits with respect to the recessed part 41, respectively.

Also in this example, the same effect as in the above embodiment or Example 1 can be obtained.

(Example 3)
FIG. 9A is a plan view of the light emitting device 100 according to Example 3, and FIG. 9B is a cross-sectional view taken along line BB in FIG. 9A. The light emitting device 100 according to the present example is different from the light emitting device 100 according to Example 1 in the points described below, and is otherwise configured in the same manner as the light emitting device 100 according to Example 1 described above. Has been.

In the first embodiment, the example in which the concavo-convex structure 4 has the plurality of concave portions 41 has been described. However, in the case of the present embodiment, the concavo-convex structure 4 is constituted by one concave portion 41. The concave portion 41 is, for example, an equilateral triangle, and the center of the equilateral triangle coincides with the rotation center axis 31 and the center 32 in plan view. The fixed plate 3 has a terminal 411 exposed in the recess 41. The terminal 411 may have a concavo-convex shape or may not have a concavo-convex shape (may be arranged flush with the bottom surface of the concave portion 41).

Also in this embodiment, the same effect as in the first embodiment can be obtained.

Example 4
FIG. 10 is a plan view of the light emitting device 100 according to the fourth embodiment. The light emitting device 100 according to the present example is different from the light emitting device 100 according to Example 3 in the points described below, and is otherwise configured in the same manner as the light emitting device 100 according to Example 3 described above. Has been.

In the third embodiment, the example in which the terminal 411 is arranged in the recess 41 (inside the concavo-convex structure 4) is shown. However, in this embodiment, the terminal 411 is different from the recess 41 (the concavo-convex structure 4). It is arranged at the position. Thus, the terminal 411 may be disposed outside the uneven structure 4.

Also in this embodiment, the same effect as in the third embodiment can be obtained.

(Reference Example 1)
FIG. 11A is a plan view of the light emitting device 200 according to Reference Example 1. FIG. In the above embodiment and each example, the example in which the outer shape of the fixed plate 3 is rotationally symmetric has been described. However, in the case of this reference example, the outer shape of the fixed plate 3 is non-rotary symmetric (one-time symmetric). Yes. Specifically, for example, the fixed plate 3 has a shape in which one corner of a square is cut obliquely (the cut plate 301 is formed in the fixed plate 3).

Although illustration is omitted, if the mounting base member 1 is not in a state in which the rotation angle of the light emitting device 200 is uniquely determined (a state in which the orientation of the notch shape portion 301 is uniquely determined), the light emitting device 200 is installed in the installation region 1a. It is formed in a shape that cannot be inserted into the.

In the case of this reference example, the concavo-convex structure 4 is composed of four circular concave portions 41. The concavo-convex structure 4 can be arranged at an arbitrary position on the upper surface of the fixed plate 3.

Also in the case of this reference example, the light emitting device 200 can be attached to the mounting base member 1 only when the rotation angle of the light emitting device 200 with respect to the mounting base member 1 is set to a unique angle. Thereby, it can suppress attaching the light-emitting device 200 to the attachment base member 1 by the wrong attachment method.

(Reference Example 2)
FIG. 11B is a plan view of the light emitting device 200 according to Reference Example 2. In the case of this reference example, the concavo-convex structure 4 is composed of one concave portion 41 having a circular shape (more specifically, a truncated cone shape). The concavo-convex structure 4 can be arranged at an arbitrary position within the upper surface of the fixed plate 3.

Although illustration is omitted, if the mounting base member 1 is not in a state in which the rotation angle of the light emitting device 200 is uniquely determined (a state in which the orientation of the notch shape portion 301 is uniquely determined), the light emitting device 200 is installed in the installation region 1a. It is formed in a shape that cannot be inserted into the.

Also in the case of this reference example, the light emitting device 200 can be attached to the mounting base member 1 only when the rotation angle of the light emitting device 200 with respect to the mounting base member 1 is set to a unique angle. Thereby, it can suppress attaching the light-emitting device 200 to the attachment base member 1 by the wrong attachment method.

(Comparative example)
12A to 12E are plan views of light-emitting devices 300 according to Comparative Examples 1 to 5. FIG.

In the light emitting device 300 according to Comparative Example 1 shown in FIG. 12A, the rotational symmetry of the concavo-convex structure 4 with respect to the rotation center axis 31 and the rotational symmetry of the fixed plate 3 with respect to the rotation center axis 31. Are equal to each other. Specifically, m = n = 4. For this reason, every time the light emitting device 300 is rotated by 90 °, the concavo-convex structure 4 can be fitted to the concavo-convex structure 5. Therefore, there is a possibility that the light emitting device 100 is attached to the attachment base member 1 in an incorrect manner.

In the light emitting device 300 according to Comparative Example 2 shown in FIG. 12B and the light emitting device 300 according to Comparative Example 3 shown in FIG. 12C, the rotational symmetry of the concavo-convex structure 4 with respect to the rotation center axis 31 is used. And the rotational symmetry of the outer shape of the fixed plate 3 with respect to the rotation center axis 31 are different from each other. However, n and m are not disjoint. That is, when the light emitting device 300 is rotated around the rotation center axis 31, both the outer shape of the fixing plate 3 and the concavo-convex structure 4 overlap each other before being rotated by 360 °. That is, the least common multiple of (360 / n) and (360 / m) is smaller than 360.
In Comparative Example 2, since m = 4 and n = 6, the concavo-convex structure 4 can be engaged with the concavo-convex structure 5 every time the light emitting device 300 is rotated 180 °.
In Comparative Example 3, since m = 8 and n = 4, the concavo-convex structure 4 can be engaged with the concavo-convex structure 5 every time the light emitting device 300 is rotated by 90 °.
Therefore, also in the comparative examples 2 and 3, there is a possibility that the light emitting device 300 is attached to the attachment base member 1 in an incorrect manner.

In the light emitting device 300 according to Comparative Example 4 shown in FIG. 12 (d), the concavo-convex structure 4 is circular and its center coincides with the center 32. On the other hand, the outer shape of the fixed plate 3 has rotational symmetry (for example, four-fold symmetry). In this case, the concavo-convex structure 4 and the concavo-convex structure 5 can be fitted as long as the fixing plate 3 can be inserted into the installation region 1 a of the mounting base member 1. That is, the concavo-convex structure 4 can be fitted to the concavo-convex structure 5 every time the light emitting device 300 is rotated by 90 °. Therefore, also in the case of the comparative example 4, there is a possibility that the light emitting device 300 is attached to the attachment base member 1 in an incorrect manner.

In the light emitting device 300 according to Comparative Example 5 shown in FIG. 12 (e), the outer shape of the fixing plate 3 is circular, and the concavo-convex structure 4 has rotational symmetry (for example, fourfold symmetry). In this case, the concavo-convex structure 4 can be fitted to the concavo-convex structure 5 every time the light emitting device 300 is rotated by 90 °. Therefore, also in the case of the comparative example 5, there is a possibility that the light emitting device 300 is attached to the attachment base member 1 by an incorrect attachment method.

As mentioned above, although embodiment and the Example were described with reference to drawings, these are the illustrations of this invention, Various structures other than the above are also employable.

For example, in the above description, an example in which the concavo-convex structure 4 includes only a concave portion or only a convex portion has been described, but the concavo-convex structure 4 may have a shape in which a concave portion and a convex portion are mixed. In this case, the concavo-convex structure 5 also has a shape in which concave portions and convex portions are mixed.

In the above description, an example in which one light emitting device 100 is attached to one attachment base member 1 has been described. However, a plurality of light emitting devices 100 may be attached to one attachment base member 1.

Claims (5)

A light emitting element;
A fixing plate in which the light emitting element is fixed to one surface;
With
A concavo-convex structure including at least one of a concave portion and a convex portion is formed on a surface opposite to the surface on which the light emitting element is fixed in the fixing plate,
The concavo-convex structure is n-fold symmetric with respect to a rotation center axis passing through the center of the fixed plate when viewed in the direction orthogonal to the fixed plate and orthogonal to the fixed plate. ,
The outer shape of the fixed plate is m-fold symmetric with respect to the rotation center axis,
A light emitting device in which n and m are relatively prime integers. The light emitting device according to claim 1, wherein a terminal for supplying electric power to the light emitting element is provided in the concave portion or the convex portion. The uneven structure includes at least a recess,
The light-emitting device according to claim 1, wherein an inner cross-sectional area of the concave portion is reduced in a depth direction of the concave portion. The uneven structure includes at least a convex part,
The light emitting device according to claim 1, wherein a cross-sectional area of the convex portion is increased toward a base end of the convex portion. The light emitting device further includes a control unit that controls light emission of the light emitting element,
The light emitting device according to any one of claims 1 to 4, wherein a terminal for supplying a signal related to control to the control unit is provided in the concave portion or the convex portion.

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