WO2018105619A1

WO2018105619A1 - Liquid sealed led

Info

Publication number: WO2018105619A1
Application number: PCT/JP2017/043679
Authority: WO
Inventors: 一乃大八木; 和樹板谷
Original assignee: シーシーエス株式会社
Priority date: 2016-12-06
Filing date: 2017-12-05
Publication date: 2018-06-14
Also published as: JP2018093105A; JP6700161B2

Abstract

The present invention increases the radiant flux discharged from a liquid sealed LED by increasing the light extraction amount, while suppressing the production cost of the liquid sealed LED. A liquid sealed LED according to the present invention is configured of: a sealing case 40 that is composed of a main body 10 which is provided with a bottomed hole that opens in a predetermined direction and a cover 30 which forms a container space 20 by closing the opening of the main body 10; an LED chip 50 that is affixed within the container space 20 of the sealing case 40; and a liquid 60 and a gas 70, which are sealed in the container space 20 of the sealing case 40.

Description

Liquid sealed LED

The present invention relates to a liquid-sealed LED.

As a conventional LED, there is a structure in which the LED chip is sealed with a liquid in order to protect the LED chip from heat. For example, in Patent Documents 1 and 2, an LED chip installed on a substrate is capped. A structure in which a liquid is enclosed in the cap (housing) and light emitted from the LED chip is transmitted outside the cap through a lens provided on the cap. It is disclosed.

However, in the liquid-sealed LED, when the liquid is sealed in the cap covering the LED chip, in order to allow the liquid to expand, it is necessary to provide a space that is not filled with the liquid to some extent. In this case, when a space that is not filled with liquid is interposed between the LED chip and the lens as in the LED shown in FIG. 1 of Patent Document 1, when the light emitted from the LED chip enters the lens, Due to the difference in refractive index, a part of the light is reflected by the lens surface and greatly attenuated, thereby reducing the amount of light extracted and reducing the radiant flux emitted from the liquid-sealed LED. On the other hand, like the LED shown in FIG. 7 and FIG. 8 of Patent Document 1 and FIG. 11 of Patent Document 2, a part located on the optical axis of the LED chip in the cap Is formed on the tip of the LED chip, a lens is attached to the tip of the LED chip, and a ring-shaped space that is not filled with liquid is provided around the depression, a space that is not filled with liquid is interposed between the LED chip and the lens. However, when the light emitted from the LED chip is reflected by the inner surface of the recess of the cap after passing through the lens, a part of the light is greatly attenuated by the inner surface of the recess, and FIG. As in the LED shown in FIG. 2, there is a problem that the radiant flux is lowered, and in order to solve this problem, a process for improving the reflectance is required on the inner surface of the recess, resulting in an increase in manufacturing cost. There was a point.

Japanese Patent No. 3351103 Japanese Patent No. 3700482

Accordingly, the main object of the present invention is to increase the amount of light extracted and increase the radiant flux emitted from the liquid-sealed LED while suppressing the manufacturing cost in the liquid-sealed LED.

That is, the liquid-sealed LED according to the present invention includes an LED chip, a sealing case having a housing space for installing the LED chip, and a liquid sealed in the housing space of the sealing case, and the sealing In the state where the case is provided on the optical axis of the LED chip and has a light-transmitting part protruding toward the LED chip side, and the optical axis of the LED chip is directed vertically upward, the tip of the light-transmitting part The side is arranged so as to be in contact with the liquid in the accommodation space or the liquid surface, and at least a part of the base end side is arranged in a space not filled with the liquid in the accommodation space. .

In such a case, since the light emitted from the LED chip enters the light-transmitting part through the liquid in the accommodation space, the light is transmitted through a space not filled with the liquid (for example, a gas phase or a vacuum phase). The reflection due to the difference in refractive index on the surface of the light transmitting part is reduced as compared with the case where the light enters the light part. Thereby, attenuation of the light at the time of entering into a translucent part is reduced. Further, the light that has entered the light-transmitting portion and has reached the base-end-side surface of the light-transmitting portion is all inward on the base-end-side surface because the base end is disposed in a space that is not filled with liquid. Since the light is reflected and emitted from the light transmitting portion, the amount of light extracted from the LED chip can be increased.

In the liquid-sealed LED, the sealing case includes a main body in which a bottomed hole that opens in a predetermined direction is formed, and a lid that closes the opening of the main body. May be provided.

The lid may be made of a material having translucency.

Moreover, in the liquid-sealed LED, a cross-sectional shape orthogonal to the optical axis of the LED chip in the housing space may be formed in a rectangular shape.

In the liquid-sealed LED, it is preferable that the space not filled with the liquid in the storage space is large so that the expansion of the liquid sealed in the storage space can be flexibly handled. Then, the shape and size of the translucent part are the former and the latter in which the cross-sectional shape perpendicular to the optical axis of the LED chip in the housing space is formed in a rectangular shape and the cross-sectional shape formed in a circular shape. And the former shortest width and the latter width are compared to each other, the former has a larger cross-sectional area than the latter, and as a result, the space that is not filled with liquid increases. It is possible to increase the proportion of the space that is not filled with liquid in this, and this makes it easier to allow the liquid to expand. (See Figure 5)

According to the liquid-sealed LED according to the present invention configured as described above, the amount of light extracted increases, and the light emitted from the liquid-sealed LED can be increased in output.

It is sectional drawing which shows the liquid sealing LED which concerns on this embodiment. It is a disassembled perspective view which shows the sealing case of the liquid sealing LED shown in FIG. It is sectional drawing which shows the case where the attitude | position of the liquid sealing LED shown in FIG. 1 is changed. It is sectional drawing which shows the case where the attitude | position of the liquid sealing LED shown in FIG. 1 is changed. It is a comparison figure explaining the effect of the liquid sealing LED shown in FIG. It is sectional drawing which shows the liquid sealing LED which concerns on other embodiment. It is a disassembled perspective view which shows the sealing case of liquid sealing LED shown in FIG. It is a top view which shows the cover body which concerns on other embodiment.

100 Liquid sealed LED
DESCRIPTION OF SYMBOLS 10 Main body 20 Storage space 30 Lid body 31 Frame part 32 Translucent part 40 Sealing case 50 LED chip 60 Liquid 70 Gas

Hereinafter, a liquid-sealed LED according to the present invention will be described with reference to the drawings.

The liquid-sealed LED 100 according to this embodiment is an LED in which an LED chip is sealed with a liquid, and in particular, a high-power LED chip that generates high heat during operation (the type of emitted light is not limited at all) is used. In this case, the structure is suitable.

As shown in FIG. 1, a liquid-sealed LED 100 according to this embodiment includes a main body 10 having a bottomed hole that opens in a predetermined direction, and a lid that forms an accommodation space 20 by closing the opening of the main body 10. A sealing case 40 made of 30; an LED chip 50 fixed in the accommodation space 20 of the sealing case 40; and a liquid 60 and a gas 70 enclosed in the accommodation space 20 of the sealing case 40. Yes.

As shown in FIG. 2, the main body 10 is formed in a block shape, and one surface facing a predetermined direction (upward in FIGS. 1 and 2) is opened. A truncated cone-shaped pedestal 11 is formed on the bottom of the main body 10 so as to protrude from the center toward the accommodation space 20, and the LED chip 50 is directed to the pedestal 11 in the light emission direction (FIG. 2). It is installed with the inside (indicated by the arrow direction X) facing toward the accommodation space 20 (upward). The main body 10 is made of a ceramic material, and the LED chip 50 is connected to the main body 10 by a bonding wire 51. Then, power is supplied to the LED chip 50 through the bonding wire 51 from the main body 10 connected to a power source (not shown).

The lid body 30 is made of a light-transmitting material, and a thin plate-like frame portion 31 fixed to the opening edge of the main body 10 and a light-transmitting portion provided integrally with a central portion of the frame portion 31. Part 32. In the translucent part 32, the outer surface side facing outward of the sealing case 40 is flush with the outer surface of the frame part 31, and the inner surface side facing inward of the sealing case 40 faces the LED chip 50 side. It protrudes in the shape of a truncated cone, and the protruding tip surface is formed in a convex lens shape. The translucent part 32 needs to be formed of a material that is not deteriorated or hardly deteriorated by light emitted from the LED chip 50, and may be formed of, for example, glass.

And the liquid 60 and the gas 70 are enclosed in the accommodation space 20. In the sealing case 40, the pedestal 11 protruding from the bottom of the main body 10 and the translucent part 32 protruding from the lid 30 are opposed to each other with a gap. As a result, the light transmitting part 32 is provided on the optical axis Y (indicated by a one-dot chain line in FIG. 1) of the LED chip 50, and light from the LED chip 50 passes through the light transmitting part 32. Through the sealing case 40.

The accommodation space 20 includes a ring-shaped first space 21 formed so as to surround the pedestal 11 and a ring-shaped second space 22 formed so as to surround the protruding portion of the light transmitting part 32. The base 11 and the translucent part 32 are connected via a gap. The liquid 60 sealed in the accommodation space 20 is electrically insulative and does not react or reacts with the material forming the LED chip 50 itself or the light emitted from the LED chip 50. Specifically, it is necessary to use a fluorine-based hydrocarbon such as florinate (trade name).

Next, the positional relationship between the liquid 60 and the gas 70 in the housing space 20, the LED chip 50, and the light transmitting part 32 when the posture of the liquid-sealed LED 100 according to the present embodiment is changed will be described.

As shown in FIG. 1, when the liquid-sealed LED 100 is in a posture in which the optical axis Y of the LED chip 50 is vertically upward, a gas 70 is accumulated on the upper side of the second space 22 in the accommodation space 20, and the gas phase (Space not filled with liquid) is formed, and the remaining space in the accommodation space 20 is filled with the liquid 60 to form a liquid phase (space filled with liquid). On the other hand, as shown in FIG. 3A, when the liquid-sealed LED 100 is in a posture in which the optical axis Y of the LED chip 50 is directed downward in the vertical direction, a gas 70 is formed above the first space 21 in the accommodation space 20. Is accumulated to form a gas phase, and the remaining space in the accommodation space 20 is filled with the liquid 60 to form a liquid phase. As shown in FIG. 3B, when the liquid-sealed LED 100 is in a posture in which the optical axis Y of the LED chip 50 is horizontal, one side surface of the sealing case 40 in the housing space 20 (FIG. 3). In (b), the gas 70 is accumulated in the space connecting the first space 21 and the second space 22 along the upper surface) to form a gas phase, and the remaining space in the accommodation space 20 is Filled with liquid 60, a liquid phase is formed. That is, the liquid-sealed LED 100 is in a state in which the liquid 60 is filled in the gap between the LED chip 50 and the translucent part 32 regardless of the posture.

And even during the transition of the liquid-sealed LED 100 to the postures, a situation in which the gas 70 is interposed between the LED chip 50 and the translucent part 32 in the accommodation space 20 hardly occurs. More specifically, for example, when the liquid-sealed LED 100 is shifted from the posture shown in FIG. 1 to the posture shown in FIG. 3B, the gas 70 is changed as shown in FIGS. 4A to 4C. When moving around the second space 22 so as to avoid the translucent part 32, similarly, the liquid-sealed LED 100 is shifted from the posture shown in FIG. 3A to the posture shown in FIG. 3B. Since the gas 10 moves around the first space 21 so as to avoid the pedestal 11, the LED chip 50 and the light transmitting part 32 in the accommodation space 20 are moved unless the liquid-sealed LED 100 is moved very vigorously. The gas 70 does not enter between the two. Thereby, even if the situation where the liquid-sealed LED 100 tilts occurs, it is difficult for the gas phase to intervene between the light transmitting portion 32 and the LED chip 50, and the light amount of light emitted from the liquid-sealed LED 100 is reduced. Can be prevented.

In addition, as shown in FIG. 1, when the liquid-sealed LED 100 is installed in a posture in which the optical axis Y of the LED chip 50 is vertically upward, the gas 70 accumulates above the second space 22 in the accommodation space 20. Thus, a gas phase is formed, and the remaining space in the accommodation space 20 is filled with the liquid 60 to form a liquid phase. Thereby, the distal end side (lower side in FIG. 1) of the light transmitting portion 32 is located in the liquid 60, and at least the proximal end side (upper side in FIG. 1) except the distal end side of the light transmitting portion 32 is air. It will be in the state arrange | positioned in gaseous-phase space among the phases. Thereby, the light emitted from the LED chip 50 and incident on the light transmitting portion 32 and reaches the base end side peripheral surface of the light transmitting portion 32 is totally reflected inward on the base end side peripheral surface, and Since the peripheral surface of the light transmitting part 32 is formed in a taper shape that expands in the light emitting direction of the LED chip 50, the light totally reflected inwardly on the base end side peripheral surface is transmitted. The light is efficiently emitted from the light unit 32. Therefore, the attenuation of light incident on the light transmitting part 32 is reduced, and the amount of light extracted from the liquid-sealed LED 100 is increased.

In addition, like the liquid-sealed LED 100 according to the present embodiment, the cross-sectional shape perpendicular to the optical axis Y of the LED chip 50 in the housing space 20 is formed in a square shape (see FIG. 5A), When the cross-sectional shape formed in a circular shape (see FIG. 5B) is compared with the light transmitting portion 32 having the same shape and the shortest width of the former is matched with the diameter of the latter, the former is the latter Since the sectional area of the accommodation space 20 becomes wider than that, and the space in which the gas 70 can be enclosed increases accordingly, the amount of the gas 70 enclosed in the accommodation space 20 can be increased. Thereby, it becomes possible to flexibly cope with the expansion of the liquid 60 sealed in the accommodation space 20. In addition, in this embodiment, although the said cross section is formed in square shape, it is not limited to this, A rectangular shape may be sufficient.

<Other embodiments>
A liquid-sealed LED 200 according to another embodiment is obtained by changing the shape of the main body 10 and the configuration of the lid 30 in the liquid-sealed LED 100. Specifically, as shown in FIGS. 6 and 7, the main body 10 is formed in a cylindrical shape, and an annular frame 34 in which the lid 30 is fixed to the opening edge of the main body 10, and the opening of the frame 34. The transparent body 33 is fixed to a surface of the frame body 34 that is located on the housing space 20 side. Therefore, the whole translucent body 33 becomes the translucent part 32 protruding to the LED chip 50 side in the embodiment, and the frame body 34 becomes the frame part 31 in the embodiment. The peripheral surface of the translucent body 33 is parallel to the optical axis Y of the LED chip 50 (indicated by a one-dot chain line in FIG. 6).

Moreover, as the cover body 30 which concerns on other embodiment, what changed the structure of the cover body 30 of liquid sealing LED200 is mentioned. Specifically, as shown in FIG. 8, the lid 30 includes a frame 31 fixed to the opening edge of the main body 10, and an octagonal translucent body 33 that closes the circular opening of the frame 31. The translucent body 33 is fixed to the surface of the frame 31 on the LED chip 50 side. Thus, by making the shape of the light transmitting body 33 an octagonal shape, the workability is improved as compared with the case where the light transmitting body 33 is formed in a circular shape. In addition, as a shape of such a translucent body 33, it is not limited to octagon shape, What is necessary is just polygonal shape. However, as the number of corners decreases, the size of the opening decreases accordingly.

In each of the above embodiments, the sealing case 40 is formed with a recess serving as the accommodating space 20 on the main body 10 side where the LED chip 50 is provided, but on the lid body 30 side where the translucent part 32 is provided. A recess that becomes the accommodation space 20 may be formed, and a recess that becomes an accommodation space is formed on both the main body 10 side and the lid body 30 side, and the main body 10 and the lid body 30 are made to coincide with each other. 20 may be formed.

Further, in each of the above embodiments, the liquid-sealed

LEDs

100 and 200 are installed in a posture in which the optical axis Y of the LED chip 50 is vertically upward, and the distal end side of the translucent part 32 is in the liquid 60 of the accommodation space 20. Although it is in an arranged state, like the liquid-sealed LED 200, the tip side of the translucent part 32 is formed in a flat shape, and the tip surface is arranged so as to be in contact with the surface of the liquid 60 in the storage space 20 It may be.

In each of the above embodiments, the lid body 30 is provided in the main body 10 so that the optical axis Y of the LED chip 50 and the central axis of the translucent part 32 or the translucent body 33 are parallel. Even if the inner surface of the frame portion 31 or the frame body 34 (the surface on the housing space 20 side) is inclined, such as by providing the central axis of the light portion 32 or the translucent body 33 to be inclined with respect to the optical axis Y of the LED chip 50. good. In such a case, when the LED chip 50 is installed in a posture in which the optical axis Y of the LED chip 50 is directed upward in the vertical direction, a space in which a part of the base end side of the light transmitting portion 32 or the light transmitting body 33 is not filled with the liquid 60. May be placed. Specifically, the lower side of the inner surface of the frame portion 31 or the frame body 34 is filled with the liquid 60, but the upper side is not filled with the liquid 60. Therefore, the lower side of the frame portion 31 or the frame body 34. The inner surface and the lower side of the translucent part 32 or the translucent body 33 are disposed in the liquid 60, while the upper inner surface of the frame part 31 or the frame body 34 and the upper side of the translucent part 32 or the translucent body 33 are liquid. Accordingly, a portion (upper side) of the base end side of the light transmitting portion 32 or the light transmitting body 33 is disposed in a space not filled with the liquid 60.

Further, as can be seen from the above embodiments, the peripheral surface of the translucent portion 32 is parallel to the optical axis Y of the LED chip 50 or spreads in the direction of light emission from the LED chip 50. What is necessary is just to be formed in the shape.

Moreover, in each said embodiment, although the liquid 60 and the gas 70 are enclosed in the storage space 20 of the sealing case 40, and the space which is not filled with the liquid 60 in the storage space 20 is made into a gaseous phase, the storage space A space not filled with the liquid 60 in 20 may be a vacuum phase.

According to the liquid-sealed LED according to the present invention, the amount of light extracted increases, and the light emitted from the liquid-sealed LED can be increased in output.

Claims

An LED chip;
A sealing case having a housing space for installing the LED chip;
Comprising a liquid sealed in a housing space of the sealing case,
The sealing case is provided on the optical axis of the LED chip, and has a light-transmitting portion protruding toward the LED chip;
In a state where the optical axis of the LED chip is directed upward in the vertical direction, the tip side of the translucent part is disposed so as to contact the liquid in the storage space or the liquid surface, and at least a part of the base end side is the A liquid-sealed LED, which is disposed in a space that is not filled with liquid in a housing space.
The said sealing case is equipped with the main body in which the bottomed hole opened to a predetermined direction was formed, and the cover body which closes opening of this main body, The said translucent part is provided in the said cover body. Liquid-sealed LED.
The liquid-sealed LED according to claim 2, wherein the lid is made of a translucent material.
The liquid-sealed LED according to claim 1, wherein a cross-sectional shape orthogonal to the optical axis of the LED chip in the housing space is a rectangular shape.