WO2013118662A1

WO2013118662A1 - Light-emitting apparatus

Info

Publication number: WO2013118662A1
Application number: PCT/JP2013/052434
Authority: WO
Inventors: 俊二柄川; 村松　正博; 菜津子北島
Original assignee: シチズンホールディングス株式会社
Priority date: 2012-02-07
Filing date: 2013-02-04
Publication date: 2013-08-15

Abstract

A circuit board (11) on which an LED element (14) is mounted is partitioned with a protection cover (30) (cover) arranged at the back face side of the circuit board (11) and with a transparent resin plate (80) (partitioning section) so that a narrow space (P) in which heat generated by the circuit board (11) is circulated by convection is formed, preventing thermal diffusion and facilitating the transfer of the heat circulated by convection to the protection cover (30) so as to raise the temperature of the protection cover (30). Thus, under conditions wherein snow or ice is deposited, snow or ice deposited on the protection cover (30) of a light-emitting apparatus is melted with the heat.

Description

Light emitting device

The present invention relates to a light emitting device using a light emitting element such as an LED (Light Emitting Diode), and more specifically, the light emitted from the light emitting element is reflected by a reflecting member to The present invention relates to the improvement of a reflection type light emitting device which emits light in the direction opposite to the direction).

Conventionally, as a light emitting device, a reflecting member (reflector) is disposed to be opposed to the light emitting surface of the LED element, light (emitted light) emitted from the LED element is reflected by the reflector, and the reflected light (reflected light) is LED A so-called reflective type in which light is emitted in the back direction of the element has been developed (Patent Document 1).

This reflection type light emitting device can emit the light emitted from the LED element to the outside with high efficiency, and therefore is particularly useful for a light emitting device that requires high luminance.

Japanese Patent Application Laid-Open No. 10-335706

Here, although various light emitting devices are used, LED elements have a smaller amount of heat generation compared to incandescent lights and the like, and are used as light parts of traffic lights under conditions exposed to, for example, snowfall. In some cases, the snow attached to the protective cover provided at the forefront of the light portion is difficult to melt, and the attached snow may reduce the visibility of the light emission state of the light portion.

This becomes a more significant problem when using a reflection type light emitting device capable of reducing the number of LED elements for the light portion of the traffic light because of the high efficiency.

The above problem may occur not only when the light emitting device is used as a traffic light, but also when it is used as a street light, a lighting fixture, or the like which may cause snowfall or icing.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a light emitting device capable of removing snow and ice attached even when snow and ice are attached.

In the light emitting device according to the present invention, the space where the circuit board on which the light emitting element is mounted is exposed is partitioned by the cover and the partition portion disposed on the back side of the circuit board, whereby the heat generated from the circuit board is wide. In order to prevent convection in the space, a narrow space is formed to prevent heat diffusion, it is easy to transfer the convective heat to the cover to raise the temperature of the cover, and even in the situation where snow or ice adheres to the cover, These attached snow and ice are melted away with heat and eliminated.

That is, a light emitting device according to the present invention includes a light transmitting cover, a circuit board having a plurality of light emitting elements mounted on one side and a surface on the other side in contact with the cover, and the circuit A partition member disposed on the side opposite to the cover with respect to the substrate and configured to reflect light emitted from the light emitting element; and a partition part configured to transmit the light between the light emitting element and the reflecting member It may be a partition member separate from the reflection member, or a part (a partition part) integral with the reflection member may be formed as a part of the reflection member.

According to the light emitting device of the present invention, even in a situation where snow or ice adheres, the adhered snow or ice can be eliminated.

It is a schematic diagram which shows the traffic signal lamp provided with the lamp part as one Embodiment of the light-emitting device of this invention. FIG. 2 is a partial cross-sectional view showing the configuration of the lighting unit of Embodiment 1; It is the figure which showed typically the state by which several LED elements etc. are distributed and mounted in the circuit board. FIG. 3 is a view showing a cross section of the main part cut in a plane (a plane along the line AA in FIG. 2) orthogonal to the extending direction of the circuit board. It is a block diagram which shows the circuit by a LED element and a control circuit. It is a figure explaining the function of a control circuit, and shows the state which switched to series connection between the groups of LED elements. It is a figure explaining the function of a control circuit, and shows the state which switched to the connection which combined series connection and parallel connection between groups of LED elements. It is a figure explaining the function of a control circuit, and shows the state which switched to parallel connection between all the groups of LED elements. It is a perspective view showing a transparent resin plate. It is principal part sectional drawing equivalent to FIG. 4 which shows the example of the structure which made the support part and the transparent resin plate separately. It is a figure which shows the example which joined the protective cover and the transparent resin plate by the screw and the nut. It is a figure which shows the example which joined the protective cover and the transparent resin plate by crimping metal pins. While forming the recessed part of a transparent resin plate in spherical shape centering on a LED element, it is a figure which shows the example which formed the spreading | diffusion part in one part. It is a figure which shows the example which formed the recessed part of the transparent resin plate as a collection of the small area | regions of the magnitude | size substantially the same as the magnitude | size of the small reflective surface of a reflector. It is a fragmentary sectional view which shows the structure of the lighting part of Embodiment 2. FIG. FIG. 14 is a view showing a cross section of the relevant part cut in a plane (plane along the line BB in FIG. 13) orthogonal to the extending direction of the circuit board. It is a perspective view showing a reflector. It is principal part sectional drawing equivalent to FIG. 14 which shows the example of the structure which made the support part and the reflector separate.

Hereinafter, embodiments of a light emitting device according to the present invention will be described with reference to the drawings.

(Embodiment 1)
The present embodiment (Embodiment 1) is an example in which the light emitting device according to the present invention is applied to the lighting unit 100 corresponding to each color (red, yellow, green) of the traffic signal lamp 200 shown in FIG.

Although the traffic signal lamp 200 shown in FIG. 1 is one in which three lamp parts 100 are vertically arranged, it goes without saying that the traffic signal lamp 200 may be horizontally arranged.

However, as a measure against snow damage in a snowy cold region, the vertical type in which the lighting sections 100 are vertically arranged is advantageous because it has less snowfall.

As shown in FIG. 2, each lighting unit 100 has a protective cover 30 formed in a substantially disc shape, a unit case 40 formed in a cylindrical shape with a bottom, and the outside of the protective cover 30 and the unit case 40. A housing is formed of an annular waterproof rubber packing 50 which holds the peripheral edge portions in an overlapping state and prevents water immersion in the internal space surrounded by the protective cover 30 and the unit case 40.

The protective cover 30 is made of, for example, polycarbonate, and has translucency to transmit light emitted from an LED element 14 (see FIG. 3 and the like) described later.

Unit case 40 is formed of, for example, an ABS resin, and is provided with a connector 70 to which an electric wire for receiving power supply such as a commercial power supply from an external control device is connected.

Inside the housing, a spiral circuit board 11 (printed wiring board etc.), a reflector 20 (reflection member) for reflecting light, a transparent resin plate 80 as a partition member, and a back side of the reflector 20 (reflection The heat insulating material 60 disposed on the side opposite to the concave surface 21 (see FIG. 4) which is a surface is accommodated.

As shown in FIG. 3, for example, 31 LED elements 14 (light emitting elements) and four control circuits 15 are provided on one surface 11 m side of the spiral circuit board 11 along the extending direction, for example. , And a set of terminals 16 are distributed and mounted. In addition, LED element 14 in this embodiment is a package mounting of the LED chip.

Then, as shown in FIGS. 3 and 4, the circuit board 11 is provided such that the opposite surface 11 n on which the LED elements 14 and the like are not mounted is in contact with the back surface 32 (surface facing the inside of the housing) of the protective cover 30. For example, it is attached to the protective cover 30 with an adhesive or a double-sided tape.

Therefore, the light emitting surface 14 a from which the light L is emitted from the LED element 14 faces the inside of the housing, not the direction of the front surface 31 of the protective cover 30, and the protective cover 30 is the back surface 14 b of the LED element 14 ( It is arrange | positioned at the side of the surface (back side) side opposite to the light emission surface 14a.

The terminal 16 provided on the circuit board 11 is connected to a connector 70 provided on the unit case 40 by an electric wire or the like, and receives power supply such as commercial power from an external control device.

A large number of LED elements 14 mounted on the circuit board 11 are divided into a plurality of groups and connected, and the control circuit 15 is a commercial power source for emitting (driving) the LED elements 14. When applying a rectified voltage obtained by rectifying alternating current to each group, control is performed to appropriately switch the connection form between a plurality of groups according to the magnitude of the rectified voltage, between parallel connection and series connection For example, it is the LED drive circuit disclosed in Japanese Patent Application Laid-Open No. 2011-159902.

That is, four control circuits 15 in the present embodiment are mounted on the circuit board 11. On the other hand, the 31 LED elements 14 mounted on the circuit board 11 are arranged in order of eight, eight, eight and seven four groups (for example, group A, group B, It is divided into group C and group D).

The three control circuits 15 among the four control circuits 15 are disposed one by one between each group of the LED elements 14, and the remaining one control circuit 15 is a terminal 16 and the first group of the LED elements 14. It is placed between.

As shown in FIG. 5, the plurality of LED elements 14 belonging to each group are all connected in series in the group. Further, the connection between each group is switchably connected in series connection and parallel connection, and each control circuit 15 selects one of these two connection forms according to the magnitude of the rectified voltage input to terminal 16. One of the connection forms is selected, and control to switch to the selected connection form is performed.

Specifically, since the commercial power supply supplied to the terminal 16 is an AC voltage, the AC voltage is full-wave rectified to drive the LED element 14, but a DC voltage (rectification obtained by the full-wave rectification) The magnitude of the voltage) changes in time series.

The control circuit 15 selects one of the following (1) to (3) as a connection form between each group of seven or eight LED elements 14 in accordance with the value of the rectified voltage input to the terminal 16. Control it.
That is,
(1) During a period in which the input rectified voltage is greater than a preset first threshold, control is made to connect all groups A, B, C, D in series as shown in FIG. 6A,
(2) As shown in FIG. 6B, groups A and B are connected in series as shown in FIG. 6B during a period in which the input rectified voltage is less than or equal to a predetermined first threshold and greater than a second threshold (value less than the first threshold). Connect, connect groups C and D in series, and control to connect two sets of series connections in parallel,
(3) Control is made to connect all the groups A, B, C, and D in parallel as shown in FIG. 6C while the input rectified voltage is less than the preset second threshold.
The symbols of circled arrows in FIGS. 6A, 6B and 6C indicate constant current sources.

Thus, the rectified voltage can not cause the LED element 14 to emit light in series connection, for example, by switching the connection form between each group of the plurality of LED elements 14 according to the magnitude of the input rectified voltage. Even in a period of voltage lower than the threshold value, the LED element 14 can emit light stably by connecting a part or all in parallel.

The reflector 20 is provided on the side facing the light emitting surface 14 a of the LED element 14 as shown in FIG. 4 and emits light from the LED element 14, and a concave portion of a transparent resin plate 80 (partition section, partition member) described later. Light L transmitted through 83, 84, 85 (only the recess 83 is described in FIG. 4) is reflected in the direction of the

recesses

83, 84, 85 and the protective cover 30 (direction toward the back surface 14b of the LED element 14). Thus, the concave surface 21 (concave reflecting surface) corresponding to each of the LED elements 14 is formed.

The concave surface 21 is formed of a substantially paraboloid whose focal point is the light emitting point 14c which is the center of the light emitting surface 14a, and when the emitted light L emitted from the light emitting surface 14a is reflected, the reflected light L is substantially parallel. I am trying to be a light.

Although the reflector 20 is formed by depositing or plating a metal film on the concave surface 21 of the injection-molded resin part, the reflector 20 may be formed by pressing a plate of a metal such as aluminum, and the emitted light L Of the concave surface 21 serving as the reflecting surface, a portion directly below the light emitting surface 14 a of the LED element 14 is formed so as to protrude substantially conically toward the light emitting surface 14 a.

The portion of the substantially conical slope 22 is formed to prevent the reflected light L from returning to the LED element 14 as it is when the emitted light L emitted substantially vertically downward from the light emitting surface 14 a is reflected. It is done.

That is, when the reflected light L returns to the LED element 14 as it is, the reflected light L is blocked by the LED element 14 itself, but if a substantially conical projecting portion is formed as in this embodiment. Since the light L reflected by the inclined surface 22 is not returned to the LED element 14 as it is, light shielding by the LED element 14 itself can be avoided.

The light L reflected by the concave surface 21 of the reflector 20 (including the inclined surface 22. The same applies hereinafter) to the protective cover 30 is transmitted through the protective cover 30 and emitted to the outside of the lamp part 100 to be viewed from outside And so on.

In addition, the area of the area | region which the light L reflected by the reflector 20 of the protective cover 30 permeate | transmits is set to S1.

The transparent resin plate 80 is made of, for example, a transparent material such as polycarbonate, and as shown in FIGS. 4 and 7, the

concave portions

83, 84, 85 partially recessed toward the reflector 20 have It is formed.

The portions other than the

concave portions

83, 84, 85 of the transparent resin plate 80 connect the

concave portions

83, 84, 85 and are formed in a contour shape along the back surface 32 of the protective cover 30. A support portion 86 for supporting the transparent resin plate 80 on the protective cover 30 in a state of being in contact with the back surface 32 (see FIG. 4).

The support 86 may support the transparent resin plate 80 on the protective cover 30 by welding, for example, or an adhesive or the like may be applied between the transparent resin plate 80 and the support 86 to form the protective cover 30. The transparent resin plate 80 may be supported.

In the lighting unit 100 of the present embodiment, the support portion 86 is formed as a part of the transparent resin plate 80, but the support portion 86 is formed separately from the transparent resin plate 80, for example, As shown in FIG. 8, the transparent resin plate 80 is interposed between the surface 81 facing the protective cover 30 and the back surface 32 of the protective cover 30 except for the

concave portions

83, 84 and 85 and is transparent to the protective cover 30. You may comprise as a supporting member which supports the resin plate 80. As shown in FIG.

Also in this case, the support portion 86 may support the transparent resin plate 80 on the protective cover 30 by welding, for example, or between the transparent resin plate 80 and the support portion 86 and between the protective cover 30 and the support portion 86. An adhesive or the like may be applied between them to support the transparent resin plate 80 on the protective cover 30.

In the example shown in FIG. 4, the concave portions 83 (84, 85) of the transparent resin plate 80 respectively protect portions of the circuit board 11 on which the LED elements 14 are mounted between the LED elements 14 and the reflector 20. A portion enclosed with 30 is divided into a closed narrow space P around the portion of the circuit board 11.

In addition, in the case of the support part 86 of the structure shown in FIG. 8, it is preferable that it is annularly formed over the outer periphery of each recessed

part

83, 84, 85, and it forms in this way annularly. By doing this, the support 86 can be surrounded by the protective cover 30 and the transparent resin plate 80 around the LED element 14.

However, the support portions 86 may not be formed annularly in such a manner, and may be formed so as to be scattered in places other than the concave portions 83 84 85 of the transparent resin plate 80.

The

recesses

84 and 85 are also the same as the recess 83, but the recess 85 is a portion that integrally surrounds a portion of the circuit board 11 in which the terminal 16, the control circuit 15, and the LED element 14 are continuously arranged, The recess 84 is a portion that integrally surrounds the circuit board 11 and the portion of the control circuit 15 and the two

LED elements

14 and 14 arranged side by side with the control circuit 15.

In addition, the recessed part 83 is a part which surrounds separately the part of only the remaining LED elements 14 which are not enclosed by recessed

part

84 and 85 among the circuit boards 11. As shown in FIG.

Although the circuit board 11 and the back surface 32 of the protective cover 30 are in direct contact with each other, the

recesses

83, 84 and 85 of the transparent resin plate 80 and the circuit board 11 are not in direct contact with each other. It has become an arrangement.

In addition, as shown in FIG. 4, the area of the surface of the protective cover 30 facing the space P formed by the protective cover 30 and the concave portion 83 of the transparent resin plate 80 is S2 as shown in FIG. The area S2 is formed to be smaller than the area S1 of the area of the protective cover 30 described above through which the light L reflected by the reflector 20 passes.

According to the lighting unit 100 of the first embodiment configured as described above, the protective cover 30 and the

concave portions

83, 84, 85 of the transparent resin plate 80 separate the convection range of the heat generated from the LED element 14 It becomes only inside the narrow space P formed inside.

Then, the heat in the narrow space P is released when it is released to a wide space (in particular, a substantially open space not divided by the

concave portions

83, 84, 85, etc. of the transparent resin plate 80). It is more difficult to diffuse and is easier to transmit to the protective cover 30 facing the space.

This is because the heat is conducted from the circuit board 11 which is a heat source to the protective cover 30, and the convective heat is transferred to the space P and the convective heat is transferred to the protective cover 30. Furthermore, the heat of the protective cover 30 dissipates heat to the outside by heat transfer by convection and heat radiation.

That is, since this heat release occurs on the surface where the protective cover 30 faces the space P, the larger the area S2 is, the easier it is to dissipate heat, so the temperature of the outer edge of the protective cover 30 decreases. On the contrary, the smaller the area S2, the higher the temperature of the protective cover 30.

As a result, the heat generated from the LED element 14 can make the temperature of at least the portion of the protective cover 30 facing the narrow space P higher than that of the case where the transparent resin plate 80 is not provided.

Therefore, even if snow or ice adheres to the protective cover 30 when the traffic light 200 is used under conditions such as snowfall, the protective cover 30 is heated, so the adhered snow or ice is heated Therefore, it is possible to prevent the visibility of the emitted light L which is melted down and flows downward and transmitted through the protective cover 30 from being obstructed by snow or ice.

If transparent resin plate 80 divides the space where LED element 14 is exposed, that is, the space between back surface 32 of protection cover 30 and reflector 20, LED element 14 is separated by protection cover 30. It does not have to be enclosed.

As described above, the transparent resin plate 80 partitions the space where the LED element 14 is exposed, so that the convection space of the heat generated from the LED element 14 can be narrowed and the heat transfer to the protective cover 30 can be improved. It is.

The joint between the protective cover 30 and the transparent resin plate 80 as a heat insulating partition member is a hole 38 formed so as to penetrate the protective cover 30 and the support portion 86 of the transparent resin plate 80 as shown in FIG. The screw 91 may be inserted into the joint, and the joint may be performed by fastening the screw 91 and the nut 92, or as shown in FIG. 10, the protective cover 30 and the support portion 86 of the transparent resin plate 80 Column-shaped metal pins 94 are inserted into the holes 38 formed to penetrate, and an axial compressive load is applied to both

end portions

94a and 94b of the metal pin 94 to plasticize the both

end portions

94a and 94b so as to crush them. It may be joined by deformation caulking.

Bonding with such a mechanical bonding member (a combination of screws 91, bolts and nuts 92, excessive tightening of both ends 94a and 94b of metal pin 94, etc.) is more preferable than bonding with adhesive or welding. Since the stability against environmental temperature and deformation over time is high, the long-term reliability of the bonding state is high.

As a result, the space P surrounded by the protective cover 30 and the

concave portions

83, 84, 85 of the transparent resin plate 80 can be maintained in a partitioned state for a long period of time, so that the snow melting effect can be maintained long. it can.

As shown in FIG. 9, the screw 91 is exposed on the outer surface side of the protective cover 30, but the waterproof packing 93 is sandwiched between the screw 91 and the protective cover 30, and the screw 91 and the protective cover Prevents flooding from a slight gap between 30 and 30. The same applies to the one shown in FIG.

9 and 10 show an example in which the fastening member is applied to one in which the support portion 86 is formed in a part of the transparent resin plate 80 shown in FIG. The fastening members similar to those shown in FIGS. 9 and 10 can be applied to the case where the support portion 86 is formed separately from the transparent resin plate 80.

In the lamp unit 100 of the present embodiment, since the circuit board 11 is provided in contact with the protective cover 30, the heat generation of the LED element 14 is transmitted to the protective cover 30 via the circuit board 11 even by heat conduction. The temperature of the protective cover 30 can be further raised.

Furthermore, the lighting unit 100 according to the present embodiment can further warm the protective cover 30 by heat conduction from the control circuit 15 by providing the control circuit 15 on the circuit board 11 in a certain place, and this control The circuit 15 is also surrounded by the

recesses

84 and 85 of the transparent resin plate 80 and the protective cover 30 and is confined in the narrow space P, so the heat of the control circuit 15 convecting in the space P is the protective cover 30. Heat transfer by convection, and the temperature of the protective cover 30 can be further raised.

In the light portion 100 of the present embodiment, the area S2 of the surface facing the protective cover 30 in the space P formed by the protective cover 30 and the concave portion 83 of the transparent resin plate 80 is reflected by the reflector 20 and protected. Since the area is smaller than the area S1 of the area from which the light L is emitted from 30 to the outside, the heat convective space P can be limited to a narrow area, and the degree of heat diffusion can be reduced.

That is, even if the volume of the space P formed by surrounding the protective cover 30 and the recess 83 is small, the area where the protective cover 30 faces the space P is wide and the recess is thin. Although it is possible to secure a wide area of the surface from which the light L is emitted to the outside, the heat from the circuit board 11, which is a heat source, raises the temperature of the protective cover 30 widely, and the temperature is It becomes difficult to rise.

On the other hand, if the area S2 of the surface on which the protective cover 30 faces the partitioned space P and the area S1 of the surface through which the light L passes are formed narrow as in this embodiment, heat The degree of diffusion can be reduced and its temperature tends to rise.

The

concave portions

83, 84, 85 are formed so that their curvatures change smoothly (continuously), so that the light L emitted from the LED element 14 into the closed space P is the transparent resin plate 80. When the light is transmitted through the

concave portions

83, 84, 85, the traveling direction of the light L can be continuously changed by the incidence to the

concave portions

83, 84, 85 and the light emission from the

concave portions

83, 84, 85.

Similarly, when the light L reflected by the reflector 20 passes through the

recesses

83, 84, 85 of the transparent resin plate 80, the light L is incident on the

recesses

83, 84, 85 and emitted from the

recesses

83, 84, 85. Thus, the traveling direction of the light L can be changed continuously.

Therefore, the intensity distribution of the light L visually recognized in the exterior of the lighting part 100 can be changed smoothly.

The light portion 100 of the present embodiment is an example in which each

concave portion

83, 84, 85 of the transparent resin plate 80 is formed so as to change the curvature smoothly, but the light portion 100 of each

concave portion

83, 84, 85 Among them, the recess 83 surrounding only the LED element 14 is preferably formed as a spherical surface centered on the light emitting point 14 c of the LED element 14 as shown in FIG.

That is, since the recess 83 of the transparent resin plate 80 is a spherical surface centered on the light emitting point 14 c of the LED element 14, the light L emitted from the light emitting point 14 c of the LED element 14 is substantially perpendicular to the transparent resin plate 80 Incident to

Then, when the light L enters the concave portion 83 of the transparent resin plate 80, the light L is reflected at the interface between the air layer of the space P partitioned by the concave portion 83 and the transparent resin plate 80 (surface of the concave portion 83 of the transparent resin plate 80) The ratio at which light L is incident perpendicularly to the interface is the smallest. Therefore, the amount of light reflected from the transparent resin plate 80 in the light L emitted from the LED element 14 can be reduced.

Moreover, even if part of the light is reflected on the surface of the recess 83 of the transparent resin plate 80, the reflected light is reflected perpendicularly to the surface of the recess 83 of the transparent resin plate 80. Therefore, the reflected light returns to the LED element 14, does not pass through the protective cover 30, and is not emitted to the outside of the lighting unit 100.

On the other hand, when the recess 83 is a non-spherical transparent resin plate 80, the light reflected by the surface of the recess 83 does not necessarily return to the LED element 14, and therefore emits through the protective cover 30 to the outside of the lamp portion 100. .

Then, the light reflected by the surface of the concave portion 83 of the transparent resin plate 80 and emitted to the outside of the light portion 100 is visually recognized by pedestrians, drivers, etc. as unnatural light scattered in the vicinity of the LED element 14 It can be done.

However, in the example in which the concave portion 83 of the transparent resin plate 80 is formed into a spherical surface centering on the LED element 14, the reflection at the concave portion 83 is suppressed, and even if it is reflected by the concave portion 83, the reflected light is a light Since the light is not emitted to the outside of the unit 100, unintended light is not visually recognized by a pedestrian or a driver outside the light unit 100.

Further, the lighting unit 100 in the example shown in FIG. 11 is a portion α of the transparent resin plate 80 corresponding to the light path through which the light L emitted from the LED elements 14 toward the concave surface 21 of the corresponding reflector 20 passes. There is formed a diffusion portion 83 a for diffusing the light L emitted from the LED element 14.

In the diffusion portion 83a, for example, the surface of the concave portion 83 is roughened to cause diffusion on the rough surface, or a substance to be diffused is mixed into the inside of the transparent resin plate 80.

As a method of roughening the surface of the concave portion 83, various methods such as a method of forming a rough surface by a mold, a method of applying a diffusion material, and a method of forming by grinding can be applied.

Here, in the case where the diffusion part 83 a is not formed, when light L emitted from the LED element 14 toward the reflector 20 and reflected by the reflector 20 is viewed outside the lamp part 100, the light L as a point light source It is visually recognized as an image of the light emitting point 14 c of the LED element 14.

On the other hand, as shown in FIG. 11, in the case where the diffusion portion 83a is formed, when light L emitted from the LED element 14 toward the reflector 20 is diffused by the diffusion portion 83a of the transparent resin plate 80 through which the light L passes, An image of light diffused by the diffusion portion 83a of the transparent resin plate 80 is visually recognized from the outside as an image reflected by the reflector 20, and is artificially recognized as an image of a surface-emitting light source.

When the light L emitted by the LED element 14 as a point light source is perceived as it is by the external viewer, it gives a granular feeling to the viewer but is viewed as the light L emitting surface light Can alleviate such graininess.

Therefore, even with the lighting unit 100 configured using the LED elements 14 of the point light source due to the restriction that the surface light source can not be applied, it is possible to alleviate the graininess due to the point light source.

As shown in FIG. 11, light L directed from the LED element 14 to the concave surface 21 of the reflector 20 corresponding to the LED element 14 in the transparent resin plate 80 (adjacent to each LED element 14 of the reflector 20) In the example where the diffusion part 83a is formed only in the part α corresponding to the light path of the light L 'directed to the concave surface 21 corresponding to the LED element 14). Since the light L is recognized as a light image reflected on the reflector 20, a block feeling which is a feeling that the lighting unit 100 looks divided into the number of LED elements 14 (the number of concave surfaces 21 in the reflector 20) remains.

However, this sense of blockiness is formed by the distribution of a bright part (relatively bright part) and a non-bright part (relatively dark part) when the lamp part 100 is viewed from the outside. On the other hand, the non-brighting portion (relatively dark portion) serves to make the presence of the circuit board 11 for shielding the light L attached to the protective cover 30 less noticeable.

That is, when the blockiness disappears and the light amount distribution becomes uniform, the light L is not emitted only to the portion where the circuit board 11 is attached, so the contrast becomes strong between the portion where the circuit board 11 exists and the portion where it does not exist. Although the presence of the circuit board 11 becomes remarkable, the above-described sense of blockiness can be made inconspicuous in the presence of the circuit board 11 because the glowing portions are scattered.

In addition, the light L diffused by the diffusion portion 83 a of the transparent resin plate 80 can also restrict the direction of the light emitted to the outside of the light portion 100 to some extent by the reflector 20, so the light emitted to the outside of the light portion 100 It is possible to prevent L from spreading excessively.

Although what was shown in FIG. 11 formed the spreading | diffusion part 83a only in a part of transparent resin plate 80, it is made to mix the spreading | diffusion material in the transparent resin plate 80, etc., and the whole transparent resin plate 80 is diffused. It is also possible to adopt a configuration as a part.

As described above, in the case where the entire transparent resin plate 80 diffuses light, a viewer outside the lighting unit 100 reflects the light by the reflector 20, and as a light image on the surface which passes through the transparent resin plate 80 again. Since L is recognized, the blockiness of the reflector 20 can also be relaxed.

However, since the light emitted from the LED element 14 passes through the transparent resin plate twice and is emitted to the outside, the light L is diffused at the degree of passage, and when it is emitted to the outside from the protective cover 30, the spread angle of the light L is Since it may become excessively large, it is necessary to select a diffusion material having a diffusion material content and an appropriate degree of dispersion.

In the case where the diffusion part 83a is formed only in a part of the transparent resin plate 80, the process of roughening the surface is carried out only on a part thereof, rather than mixing the diffusion material only on a part thereof. But is easy to manufacture and is preferred.

Moreover, in the lighting part 100 of each embodiment mentioned above, although the reflector 20 has the concave surface 21 which is a reflective surface of the concave (for example, paraboloid) corresponding to each LED element 14, these each For example, as shown in FIG. 12, the concave surface 21 has a plurality of small convex

small reflection surfaces

21a, 21b, 21c, 21d, 21e, 21f, 21g, 21h, 21i, 21j, 21k, 21l (these small reflection surfaces , The convex surface, the concave surface, or the flat surface) (facet reflector), the LED element 14 of the transparent resin plate 80

Small regions

83b, 83b,... (Each of these

small regions

83b, 83b,..., L) are formed to have substantially the same size as the small reflective surfaces 21a,. May be a convex shape toward the D element 14 may be a concave, preferably to those formed by the combination of which may be.) Planar.

Each concave surface 21 of the reflector 20 is formed of a combination of a plurality of small small reflecting surfaces 21 a,..., So that light L emitted from each LED element 14 and reflected by the corresponding concave surface 21 of the reflector 20 is A pedestrian or a driver outside the lighting unit 100, for example, reflects light L emitted from one LED element 14 to a plurality of small lights, since the light is reflected by different small reflection surfaces 21a,. It is visually recognized as light reflected by the reflecting surfaces 21a,.

When the reflective surface is a single smooth concave surface 21, the central portion of the concave surface 21 is the brightest and monotonously darkens as it goes away from the central portion, but as described above, the reflective surface is a plurality of small reflective surfaces 21 a In the case of those formed by ..., since light reflected not only in the vicinity of the central part of the reflective surface but also on a plurality of small reflective surfaces 21a, ... including the central part is emitted to the outside, from the central part It is possible to obtain a distribution that gradually becomes dark while repeating light and dark, instead of becoming monotonously dark as it goes away.

At this time, the pedestrian or the driver visually recognizes the light L with a granular feeling depending on the size of the small reflective surfaces 21a,.

On the other hand, the concave portion 83 of the transparent resin plate 80 is formed by combining a plurality of small areas 83b having substantially the same size as the small reflective surfaces 21a, ... of the reflector 20, the light L emitted from the LED element 14 The light reflected from the surface of the concave portion 83 of the transparent resin plate 80 is reflected by each of the small regions 83b of the transparent resin plate 80, so that pedestrians and drivers outside the lighting unit 100 can use the transparent resin plate. Also, the light reflected by the concave portion 83 is visually recognized as the light reflected by the plurality of small regions 83 b,.

That is, the pedestrian, the driver or the like visually recognizes the reflected light in the recess 83 with a granular feeling depending on the size of the small area 83 b.

Since the size of each of the small regions 83b is substantially the same as that of the small reflective surfaces 21a, the grain size of the reflected light reflected by the small regions 83b is smaller than that of the small reflective surfaces 21a,. It matches with the grain size of the reflected light reflected by.

Therefore, the light reflected by the concave portion 83 of the transparent resin plate 80 does not have a different grain size from the light reflected by the small reflective surfaces 21 a of the reflector 20, so the small reflective surface 21 a of the reflector 20 does not occur. The reflected light at the concave portion 83 of the transparent resin plate 80 does not stand out from the viewpoint of the difference in grain size with respect to the reflected light at.

That is, even if a pedestrian or driver who visually recognizes light from the outside of the light unit 100 visually recognizes the reflected light at the concave portion 83 of the transparent resin plate 80 in addition to the reflected light at the reflector 20 Since the particle size of the light is substantially the same, the degree of conspicuousness of the reflected light at the concave portion 83 of the transparent resin plate 80 can be reduced.

In the example shown in FIG. 11 where the shape of the surface of the concave portion 83 of the transparent resin plate 80 is a spherical surface centered on the LED element 14, temporary emission of reflected light from the transparent resin plate 80 is prevented. If an attempt is made to set the opening area of the spherical surface along the surface of the protective cover 30 large, the length in the direction toward the reflector 20 (corresponding to the radius of the spherical surface: physical quantity affecting the thickness of the lamp 100) I can not but increase it.

On the other hand, in the case where the transparent resin plate 80 is formed as a combination of a plurality of small regions 83 b,..., Even when the opening area of the transparent resin plate 80 is tried to be set large, Since it is not necessary to increase the length of the direction, the design freedom of the shape of the recess 83 surrounding the LED element 14 of the transparent resin plate 80 can be improved.

Further, the example of FIG. 12 in which the shape of the surface of the concave portion 83 of the transparent resin plate 80 is formed by a plurality of small regions 83b,... Compared with the example of FIG. 11 to prevent, the reflected light reflected on the surfaces of the plurality of small regions 83b,... Is not absorbed back to the LED element 14, and the light is visually recognized from the outside of the lamp 100 Since the light is reflected to the driver or the driver, the light extraction efficiency can be enhanced.

The lighting unit 100 of the present embodiment uses a spiral circuit board 11. However, the circuit board in the light emitting device according to the present invention is not limited to that of this embodiment, and the reflector 20 is used. Any shape or characteristic may be applied as long as it has a gap or transparency that allows the reflected light L to be transmitted to the outside.

Since the circuit board 11 is disposed on the optical path of the light L reflected by the reflector 20, as the width W of the circuit board 11 becomes wider, the amount of blocking the reflected light L increases.

Therefore, it is desirable that the width W be as narrow as possible or have a transparency that does not prevent the passage of the light L.

Embodiment 1 mentioned above is an example which applied a light-emitting device concerning the present invention to lighting part 100 of traffic signal lamp 200, but a light-emitting device concerning the present invention is not limited to this embodiment, A street lamp And lighting equipment.

Further, since the light portion 100 of the present embodiment, which is a reflection type light emitting device, can adjust the direction and the like of the emitted light L from the LED element 14 according to the shape and the like of the reflector 20, the light L should be emitted. In the range to be taken, since the light can be emitted to the outside with high efficiency, the number of LED elements 14 can be significantly reduced compared to the conventional non-reflective LED traffic light part, and the cost can be reduced. It can be reduced.

For example, although the light part of the traffic light of non-reflection type using LEDs uses one hundred and twenty to four hundred and several hundred LEDs, the light part 100 of this embodiment has only 31 LED elements. 14 can be used to obtain visibility equal to or greater than that of a conventional non-reflection signal lamp.

Moreover, since the light of the LED element 14 which is a point light source is spread and emitted over the entire concave surface 21 of the reflector 20, the amount of light per unit area can be reduced, and glare can be reduced. It becomes suitable as the light part 100 of the traffic signal lamp 200 which a driver | operator looks at directly.

Moreover, the graininess is remarkable in the conventional traffic signal lamp using the non-reflecting LED signal lamp device, and if the number of LED elements is extremely reduced, the original circular shape can not be expressed. Since it is possible to realize substantially surface light emission with reduced graininess, it is possible to obtain visibility equal to or more than that of the conventional one by using a small number of LED elements 14.

Second Embodiment
Hereinafter, another embodiment (embodiment 2) of the light emitting device according to the present invention will be described. In addition, while attaching | subjecting the code | symbol same about the structure substantially the same as the light part 100 which is a light-emitting device shown as Embodiment 1, the overlapping description shall be abbreviate | omitted.

The present embodiment (Embodiment 2) is an example in which the light emitting device according to the present invention is applied to the lamp portion 100 'corresponding to each color (red, yellow, green) of the traffic signal lamp 200 shown in FIG.

As shown in FIG. 13, each lighting unit 100 ′ includes a protective cover 30 formed in a substantially disc shape, a unit case 40 formed in a cylindrical shape with a bottom, and the protective cover 30 and the unit case 40. A housing is formed of an annular waterproof rubber packing 50 that holds the outer peripheral edge portions in a superimposed state and prevents water immersion in the internal space surrounded by the protective cover 30 and the unit case 40.

Here, in the light portion 100 of the first embodiment, a transparent resin plate 80 separate from the reflector 20 and disposed between the circuit board 11 and the reflector 20 is disposed as a partition member or partition portion through which the light L is transmitted. The lamp unit 100 'of the second embodiment is different in that the partition unit interposed between the circuit board 11 and the reflector 20 is configured as a part of the reflector 20' (reflection member).

That is, as shown in FIG. 14, in the light portion 100 ′ of the second embodiment, the transparent resin layer 87 as a partition portion which partitions the space where the circuit board 11 is exposed and which transmits the light L is integrated with the reflector 20 ′. It is formed.

The configuration other than the transparent resin layer 87 and the reflector 20 ′ in the lighting unit 100 ′ of the second embodiment is substantially the same as the configuration in the lighting unit 100 of the first embodiment.

As shown in FIG. 14, the reflector 20 ′ is provided on the side facing the light emitting surface 14 a of the LED element 14, and of the transparent resin layer 87 having a light transmitting property for transmitting the light L emitted from the LED element 14. The reflective film 26 is formed on the convex surface 82 on the side far from the LED element 14.

The transparent resin layer 87 of the reflector 20 'is made of, for example, a transparent material such as polycarbonate and, as shown in FIG. , 84, 85 (only the recess 83 is described in FIG. 14) are formed.

Recesses 83 are respectively formed corresponding to the portions of circuit board 11 on which LED elements 14 are mounted, as shown in FIG.

The

recesses

84 and 85 are also the same as the recess 83, but the recess 85 is formed corresponding to the portion of the circuit board 11 in which the terminal 16, the control circuit 15, and the LED element 14 are continuously arranged, The recess 84 is formed corresponding to the portion of the circuit board 11 that is the control circuit 15 and the two

LED elements

14 and 14 arranged side by side.

The recess 83 is formed corresponding to only the remaining LED elements 14 of the circuit board 11 which are not surrounded by the

recesses

84 and 85.

Although the circuit board 11 and the back surface 32 of the protective cover 30 are in direct contact, the

recesses

83, 84 and 85 of the reflector 20 'and the circuit board 11 are not in direct contact but through the air layer It is arranged.

Portions of the transparent resin layer 87 of the reflector 20 'other than the

concave portions

83, 84, 85 are formed to have a contour along the back surface 32 of the protective cover 30 while connecting the

concave portions

83, 84, 85. A support portion 86 for supporting the reflector 20 'on the protective cover 30 in contact with the back surface 32 of the cover 30 (see FIG. 14).

The support portion 86 may support the reflector 20 ′ on the protective cover 30 by welding, for example, or an adhesive or the like may be applied between the reflector 20 ′ and the support portion 86 to form a reflector on the protective cover 30. It may support 20 '.

In the light portion 100 'of this embodiment, the support portion 86 is formed as a part of the reflector 20' having the transparent resin layer 87 as a partition portion. Is separately formed, for example, as shown in FIG. 16, between the surface 81 facing the protective cover 30 and the back surface 32 of the protective cover 30 in the portion other than the

concave portions

83, 84, 85 of the reflector 20 '. The protective cover 30 may be configured as a support member to support the reflector 20 '.

Also in this case, the support portion 86 may support the reflector 20 ′ on the protective cover 30 by welding, for example, or between the reflector 20 ′ and the support portion 86 and between the protective cover 30 and the support portion 86. An adhesive or the like may be applied between them to support the reflector 20 ′ on the protective cover 30.

In the light portion 100 'of the present embodiment, the recessed portions 83 (84, 85) of the transparent resin layer 87 of the reflector 20' are respectively the LED elements 14 of the circuit board 11 between the LED elements 14 and the reflector 20 '. The mounted portion is enclosed with the protective cover 30 and partitioned into a narrow space P in which the periphery of the circuit board 11 is closed.

In addition, in the case of the support part 86 of the structure shown in FIG. 16, it is preferable that it is annularly formed over the outer periphery of each recessed

part

83,84,85, and it forms in this way cyclically. By doing this, the support 86 can be surrounded by the protective cover 30 and the reflector 20 '.

However, the support portion 86 may not be formed annularly in such a manner, and may be formed so as to be dotted in places other than the concave portions 83 84 85 of the reflector 20 ′.

The support portions 86 formed around the

recesses

84 and 85 are similar to the support portions 86 formed around the recess 83, but the support portions 86 formed around the recess 85, the protective cover 30, and the like. The transparent resin layer 87 of the reflector 20 'integrally surrounds a portion of the circuit board 11 in which the terminal 16, the control circuit 15, and the LED element 14 are continuously arranged.

The support portion 86 formed around the recess 84, the protective cover 30, and the transparent resin layer 87 of the reflector 20 'are two

circuit elements

11 and 14 of the circuit board 11 aligned with the control circuit 15 therebetween. And one part of it.

The supporting portion 86 formed around the recess 83, the protective cover 30, and the transparent resin layer 87 of the reflector 20 'are only the remaining LED elements 14 not surrounded by the

recesses

84 and 85 in the circuit board 11. The parts are individually enclosed.

The reflective film 26 is formed by depositing or plating a metal film on the convex surface 82 of the transparent resin layer 87, but is not limited to this form.

Of the convex surface 82 of the transparent resin layer 87 on which the reflective film 26 is formed, the portion directly below the light emitting surface 14a of the LED element 14 is substantially conical in shape toward the light emitting surface 14a as shown in FIGS. It is formed to be protruded.

The

surfaces

28 and 29 of the reflective film 26 facing the transparent resin layer 87 direct light L incident from the LED element 14 to the transparent resin layer 87 in the direction of the protective cover 30 (direction of the back surface 14 b of the LED element 14). It is a reflective surface that reflects.

The reflecting surface 28 is formed substantially in a paraboloid whose focal point is the light emitting point 14c which is the center of the light emitting surface 14a, and when the light L emitted from the light emitting surface 14a is reflected, the reflected light L is It is made to be approximately parallel light.

On the other hand, the reflecting surface 29 formed along the surface of the transparent resin layer 87 which is formed so as to project in a substantially conical shape toward the light emitting surface 14a is the emitted light L emitted substantially vertically downward from the light emitting surface 14a. When the light is reflected, it is formed to prevent the reflected light L from returning to the LED element 14 as it is.

That is, when the reflected light L returns to the LED element 14 as it is, the reflected light L is blocked by the LED element 14 itself, but if a substantially conical projecting portion is formed as in this embodiment. Since the light L reflected by the reflective surface 29 which is the slope does not return to the LED element 14 as it is, light shielding by the LED element 14 itself can be avoided.

Light L reflected by the reflecting

surfaces

28 and 29 of the reflector 20 'and traveling toward the protective cover 30 is transmitted through the protective cover 30 and emitted to the outside of the light portion 100' and can be viewed by an external viewer or the like It becomes.

The area of a region of the protective cover 30 through which the light L reflected by the reflector 20 'is transmitted is S1.

Here, as shown in FIG. 14, the protective cover 30 is formed so as to surround the area S1 of the area through which the light L from the

reflective surfaces

28 and 29 transmits, by the protective cover 30 and the recess 83 of the reflector 20 '. Assuming that the area of the surface of the protective cover 30 facing the space P is S2, the reflector 20 'is formed such that the area S2 is smaller than the area S1 (S2 <S1).

According to the light portion 100 'of the second embodiment configured as described above, the protective cover 30 and the

concave portions

83, 84, 85 of the reflector 20' divide the heat convective range of the LED element 14 into a convective range It becomes only inside the narrow space P formed inside.

Then, the heat in the narrow space P is released from the heat in the case of being released to a wide space (in particular, a substantially open space not divided by the

concave portions

83, 84, 85, etc. of the reflector 20 '). It is hard to diffuse, and it is easy to be transmitted to the protective cover 30 which faced the space.

As a result, the heat generated from the LED element 14 can make the temperature of at least the portion of the protective cover 30 facing the narrow space P higher than that of the case where the support portion 86 is not provided.

If the transparent resin layer 87 is partitioned to narrow the space where the LED element 14 is exposed, that is, the space between the back surface 32 of the protective cover 30 and the reflector 20 ′, the LED element 14 together with the protective cover 30. It does not have to surround it.

As described above, the transparent resin layer 87 partitions the space where the LED element 14 is exposed, so that the convection space of the heat generated from the LED element 14 can be narrowed and the heat transfer to the protective cover 30 can be improved. It is.

The joining between the protective cover 30 and the transparent resin layer 87 to the reflector 20 'as partition members for heat insulation is fastened with a screw 91 and a nut 92 in the same manner as the light portion 100 of the first embodiment. However, the metal pins 94 may be joined by caulking.

Bonding by such mechanical bonding members is highly reliable in the long term.

Since the circuit board 11 is provided in contact with the protective cover 30 in the light portion 100 'of this embodiment, the heat generation of the LED element 14 is transmitted to the protective cover 30 via the circuit board 11 even by the type of heat conduction. The temperature of the protective cover 30 can be further raised.

Furthermore, the lighting unit 100 'of the present embodiment can further warm the protective cover 30 by heat conduction from the control circuit 15 because the control circuit 15 is provided on the circuit board 11 everywhere. Since the control circuit 15 is also surrounded by the reflector 20 ′, the support portion 86 and the protective cover 30 and is confined in the narrow space P, the heat of the control circuit 15 convecting in the space P is transferred to the protective cover 30. The heat transfer can be facilitated by convection, and the temperature of the protective cover 30 can be further raised.

In the light portion 100 'of the present embodiment, the reflection film 26 is formed on the transparent resin layer 87, the reflector 20' having the reflection surfaces 28 and 29 is integrally formed, and the light L incident from the LED element 14 is detected. There is no need to separately provide a partition member or the like for partitioning the narrow space P separately from the reflector 20 'in order to reflect the light so as to emit toward the outside of the protective cover 30, and the number of parts is reduced. Simplification and cost reduction can be achieved.

Furthermore, in the light portion 100 'of the present embodiment, the area S2 of the surface facing the protective cover 30 in the space P formed by the protective cover 30 and the concave portion 83 of the reflector 20' is reflected by the

reflective surfaces

28 and 29. Because the area is smaller than the area S1 of the area from which the light L is emitted from the protective cover 30 to the outside, the space P to which heat is convective can be limited to a narrow area, and the degree of heat diffusion is reduced. it can.

That is, even if the volume of the space P of the

concave portions

83, 84, 85 formed by surrounding the protective cover 30 and the transparent resin layer 87 is small, the area where the protective cover 30 faces the space P is wide, And when it is a space where the recess is thin, it is possible to secure a wide area of the surface from which the light L is emitted to the outside, but the heat from the circuit board 11 which is a heat source causes the The temperature becomes difficult to rise.

The

concave portions

83, 84, 85 are formed so that their curvatures change smoothly (continuously), so the light L emitted from the LED element 14 into the closed space P is transparent resin layer 87 The traveling direction of the light L can be continuously changed by the incidence on the light and the arrival at the reflecting

surfaces

28 and 29.

Similarly, the traveling direction of the light L is continuously changed by the emission from the transparent resin layer 87 and the arrival at the protective cover 30 of the light L reflected by the reflection surfaces 28 and 29 of the reflector 20 ′. Can.

Therefore, the intensity distribution of the light L visually recognized in the exterior of the light part 100 'can be changed smoothly.

In the light portion 100 'of the second embodiment, as in the light portion 100 of the first embodiment, as shown in FIG. 11, the light emitting point 14c of the LED element 14 is the concave portion 83 surrounding only the LED element 14. It is preferable to form in the spherical surface centering on.

According to the light portion 100 'configured in this manner, the amount of light L reflected by the surface of the transparent resin layer 87 among the light L emitted from the LED element 14 can be reduced, and further, temporarily the transparent resin Even when part of the light is reflected on the surface of the layer 87, the reflected light is reflected perpendicularly to the surface of the concave portion 83 of the transparent resin layer 87, so the reflected light is the LED element 14 Since the light does not pass through the protective cover 30 and is not emitted to the outside of the light portion 100 ', unnatural light is not visually recognized by pedestrians and drivers outside the light portion 100'.

Further, a portion of the transparent resin layer 87 corresponding to the light path through which the light L emitted from each LED element 14 toward the concave surface 28 of the reflector 20 'passes (a portion in the lamp portion 100 of the embodiment shown in FIG. A diffusion portion (corresponding to the diffusion portion 83a in the lamp portion 100 of the embodiment shown in FIG. 11) for diffusing the light L emitted from the LED element 14 may be formed on the α).

In the case where the diffusion portion is formed as described above, when the light L emitted from the LED element 14 toward the reflector 20 ′ is diffused by the diffusion portion of the transparent resin layer 87 passing through, the diffusion portion of the transparent resin layer 87 An image of the diffused light is visually recognized from the outside as an image reflected by the reflector 20 ', and is artificially recognized as an image of a surface-emitting light source.

Therefore, even with the lighting unit 100 'configured using the LED elements 14 of the point light source due to the restriction that the surface light source can not be applied, the graininess due to the point light source can be alleviated.

Further, in the case where the reflector 20 'is a facet reflector formed of a combination of a plurality of small convex small reflection surfaces, the concave portion 83 of the transparent resin layer 87 surrounding the LED element 14 corresponds to each small reflection of the reflector 20. It is preferable to be formed by a combination of small areas (corresponding to the

small areas

83b, 83b,... In the lighting unit 100 of the first embodiment) formed in substantially the same size as the surface.

Thus, the reflector 20 'is a facet reflector formed of a combination of a plurality of small convex small reflection surfaces, and the concave portion 83 of the transparent resin layer 87 surrounding the LED element 14 is a small reflection of each of the reflector 20. A pedestrian or the like visually recognized outside the light part 100 'has a reflection light from the surface of the transparent resin layer 87 as a reflector, as it is formed by a combination of small areas formed in substantially the same size as the surface. Since the size of the reflected light and the particle size at the small reflective surface 20 are the same, the degree of the reflected light at the transparent resin layer 87 can be reduced.

The lighting unit 100 'of the present embodiment uses the spiral circuit board 11, but the circuit board in the light emitting device according to the present invention is not limited to that of this embodiment, and a reflecting surface is used. Any shape or characteristic can be applied as long as it has a gap or transparency that allows the light L reflected by 28 and 29 to be transmitted to the outside.

In addition, since the circuit board 11 is disposed on the optical path of the light L reflected by the reflection surfaces 28 and 29, as the width W of the circuit board 11 becomes wider, the amount of blocking the reflected light L increases. .

Embodiment 2 mentioned above is an example which applied a light-emitting device concerning the present invention to lighting part 100 'of traffic signal lamp 200, but a light-emitting device concerning the present invention is not limited to this embodiment, It can be applied to street lights and lighting fixtures.

Cross-reference to related applications

This application is related to Japanese Patent Application No. 2012-024076 filed on Feb. 7, 2012 in Japan Patent Office, Japanese Patent Application No. 2012-257322 filed on Nov. 26, 2012 in Japanese Patent Office, and February 2012 Priority is claimed on the basis of Japanese Patent Application No. 2012-029479 filed on the 14th in the Japanese Patent Office, the entire disclosure of which is incorporated herein by reference in its entirety.

11 circuit board 14 LED element (light emitting element)
20 reflector (reflection member)
21 concave 30 protective cover (cover)
32 back surface 80 transparent resin plate (partition part, partition member)
83, 84, 85 Recess 86 Support part 87 Transparent resin layer (partition part)
100, 100 'light section (light emitting device)
200 traffic lights L light, emitted light, emitted light

Claims

A translucent cover,
A circuit board on which a plurality of light emitting elements are mounted on one side and the other side is in contact with the cover;
And a reflective member disposed on the side opposite to the cover with respect to the circuit board and reflecting light emitted from the light emitting element.
A light emitting device characterized in that a partition portion which transmits the light is interposed between the light emitting element and the reflecting member.
The light emitting device according to claim 1, wherein the partition portion is a partition member which is disposed between the light emitting element and the reflecting member and which is separate from the reflecting member.
The light emitting device according to claim 1, wherein the partition portion is formed as a part of the reflection member.
The light emitting device according to any one of claims 1 to 3, wherein the light emitting element is surrounded by the cover and the partition portion.
The light emitting device according to any one of claims 1 to 4, further comprising a support portion configured to support the partition portion on the cover.
The light emitting device according to claim 5, wherein the support portion is formed as a part of the partition portion.
The light emitting device according to any one of claims 1 to 6, wherein a part of the partition part surrounding the circuit board is formed so as to change its curvature smoothly.
The light emitting device according to any one of claims 1 to 6, wherein the part of the partition part surrounding the circuit board is formed as a spherical surface centered on the light emitting element.
The reflecting member has a concave reflecting surface corresponding to each light emitting element, and the concave reflecting surface is formed by a combination of a plurality of small reflecting surfaces,
The part of the partition part surrounding the circuit board is formed by a combination of small areas formed in substantially the same size as the small reflective surface of the reflective member. The light-emitting device according to any one of the above.
In the partition portion, a portion corresponding to an optical path through which light emitted from the light emitting element toward the reflecting member passes is formed so as to diffuse light emitted from the light emitting element. The light emitting device according to any one of claims 1 to 9.
A large number of light emitting elements are mounted on the circuit board along the extending direction thereof;
These many light emitting elements are divided and connected to a plurality of groups each having a plurality of light emitting elements in each group,
When applying a rectified voltage for driving the light emitting elements to the groups, the connection form between the plurality of groups is connected in series with one or more of parallel connection and series connection according to the magnitude of the rectified voltage. Control circuits for switching the connection to a combination of
The light emitting device according to any one of claims 1 to 10, wherein the partition portion is configured to surround the circuit board together with the cover between the control circuit and the reflecting member.