WO2010146664A1

WO2010146664A1 - Led illuminator, and thin, surface light-emitting device

Info

Publication number: WO2010146664A1
Application number: PCT/JP2009/060951
Authority: WO
Inventors: 宣夫大山
Original assignee: 株式会社エス・テー・アイ・ジャパン
Priority date: 2009-06-16
Filing date: 2009-06-16
Publication date: 2010-12-23

Abstract

Disclosed is an illuminator comprising: a reflector having a cup-shaped reflection face on the inner side of the surface of rotation which is formed by rotating, on one axis, either a portion of an ellipse, a parabola, a hyperbola or another curve, or a line segment having a curve and a straight line together; and a light-transmitting plate disposed near the opening of the cup-shaped reflection face and having multiple ridges arranged on the two principal faces thereof in parallel with each other and sufficiently close to each other. Furthermore, the illuminator comprises an optical diffusion transmitting plate, in which a section perpendicular to the longitudinal direction of each ridge substantially forms a portion of a circle in a predetermined shape and size thereby to provide a substantial mirror surface including the surface of those ridges, and in which the ridges intersect perpendicularly between the two principal faces. LED packages are arranged equidistantly on the circumference centered by the axis of rotation of the cup-shaped reflection face, and a luminous flux near the center line among the luminous fluxes of the individual LED packages is directly incident on and reflected by a reflection face so that the luminous flux is incident on the optical diffusion transmitting plate and emanates from one face of same.

Description

LED illuminator and thin surface light emitting device

The present invention relates to a downlight using a light-emitting diode (hereinafter referred to as “LED”) as a light source, and a linear array of a number of LED packages, or a straight tube type fluorescent lamp, a straight tube type cold cathode fluorescent tube (hereinafter referred to as “CCFL”). And a thin panel light emitting device such as a signboard, a sign, a backlight of a display, and other light irradiation devices. Is.

Measures to alleviate the glare caused by the high-luminance luminous flux of LEDs and CCFLs have been taken for many illuminators that use LEDs as the light source and backlights that use CCFLs. As the simplest countermeasure, a light diffusing and transmitting plate is arranged on the front surface of the LED package so that the surface thereof is orthogonal to the central axis of the luminous flux of the LED package, and this is used as the light exit surface. Many downlights that use LEDs as light sources on the market use this method, or in addition to this, a method of attaching a diffusion lens to the LED package.

Using a pair of mutually parallel and substantially mirrored light transmission plates as optically dense media, the light beam of the light source incident from one end of the incident light beam has a critical angle of total reflection. Light rays that are incident on the interface with the outer optically sparse medium (typically air) beyond are directed to the other end by total reflection, and are incident on the interface at an incident angle smaller than the critical angle of total reflection. Is partially reflected and partially refracted and incident on an optically sparse outer medium. That is, the light is refracted and emitted outward.

Regarding the backlight, in addition to the function of the light transmissive plate as a light guide plate, as a means for refracting and emitting more of the incident light beam to the entire main surface as a boundary surface, A large number of prism-shaped ridges that are parallel to each other and arranged sufficiently close to each other on one main surface and whose surface is a mirror surface are formed, and have a major axis in a direction perpendicular to the extending direction of the ridges. There is a method in which the light source is arranged in the vicinity of the side surface so that its long axis is parallel to the long side of the side surface.

As a result, every time a light beam traveling in the light transmitting plate enters the boundary surface, the total reflection is lost, a part of the light is refracted to the outside, a part is reflected, and the total reflection is smaller than the critical angle. It is possible to reduce the reflection rate of light incident at an incident angle, increase the rate of refracting emission to the outside, and emit more incident light beams to the outside of the entire main surface.

The light transmitting plate having a function of emitting the light beam incident from the side surface over the entire main surface, including other methods, is hereinafter referred to as a “light guide type surface emitting plate”.

The light beam emitted from the light guide type surface emitting plate is sent to the light emitting surface side of the backlight by the reflecting plate arranged on one main surface side, and passes through at least one light diffusing / transmitting plate or film. Emitted from the light exit surface.
Further, in the above-described light guide type surface emitting plate, by narrowing the interval between the main surfaces toward one end, more of the introduced light beam enters the boundary surface, and more light beam is emitted than the entire main surface. This method, including the above method, was developed by the inventor of the present application by 1990, and is widely used in backlights of personal computers. A similar method is also disclosed in Patent Document 1 thereafter.

Patent Document 2 discloses that one surface is flat and the other surface has a number of parallel saw blade-shaped prisms and a light-transmitting film that is bent shallower than the middle line, and the surface on the mountain side. In addition, a single light-transmitting film having a number of parallel saw-blade prisms in a direction perpendicular to the middle line, the respective projecting surfaces face each other, and the directions of the projecting strips are orthogonal to each other. As shown, a structure is shown in which light beams of light sources arranged at predetermined intervals and arranged in the vicinity of both ends of a space sandwiched between the two light transmission films are introduced into the space. The introduced light beam exits from the main surfaces of the two light transmission films. Hereinafter, such a mechanism that introduces a light beam into the space between two plates or films and emits the introduced light beam from the main surface of any one of these plates or films is referred to as a “light guide space type surface emitting mechanism”.

As for the illuminator, Patent Document 3 introduces a light flux of a light source into a space between one light diffusing and transmitting plate and its middle line, or a reflecting surface asymptotic toward one end, and reflection between both surfaces. A “light guide space type surface emitting mechanism” that emits the introduced light flux from the light diffusion transmission plate by transmission is shown.

JP 2004-335209 A JP 2004-71576 A JP 2006-202710 A

Each of the downlights described in the above "Technical Background" section has sufficient brightness because the light beam traveling in the vicinity of the center line of the light beam emitted from each LED package is substantially orthogonal to the light diffusing and transmitting plate serving as the light exit surface. In the range where the light exit surface of the illuminator enters the field of view, the eyes are struck by the strong light of each light emitting diode and are stressed.

In the “Technical Background” section above, a pair of mutually parallel main surfaces “light guide type surface light emitting plate” is that a part of the light beam incident from the side surface does not enter any main surface. Without being emitted from the light guide type surface light emitting plate, it is absorbed by the light guide type surface light output plate, the structure around the side surface and the light source, and becomes heat. The ratio relates to the ratio of the luminous flux distribution, the light guide distance, and the thickness of the light guide type surface light emitting plate, but makes it difficult to increase the light output efficiency from the light output surface.

Moreover, when this method is used for a light panel, a backlight, or other light irradiation devices, their weight increases.

Similarly, using a wedge-shaped light-guiding surface light emitting plate according to Patent Document 1, a light source is disposed in the vicinity of a pair of opposite side surfaces of a light panel, a backlight, and other light irradiation devices to obtain one light emitting surface. In such a case, it is necessary to integrate two wedge-shaped light guide type surface light emitting plates at the thinnest portion, and it is difficult to obtain sufficient structural strength.

As a method of maximizing the luminous flux of a light source arranged near one side or opposite side of a thin rectangular housing with a thin and light structure, it was sandwiched between two thin plates or films that approached as they moved away from the light source Patent Document 2 and Patent Document 3 can be cited as “light guide space type surface emitting mechanism” that introduces a light beam of a light source into a space and emits the light from at least one of such a thin plate or a film. have.

In the “light guide space type surface emitting mechanism” shown in Patent Document 2, the introduced light beam is incident on the surface of a light transmission film, which is a dense medium, from air, which is an optically sparse medium. As shown in FIG. 1, a light beam incident on the surface of a dense medium from this sparse medium does not reflect on the entire surface regardless of the incident angle, even if the incident surface is flat and mirror-like, and a part of it is reflected. The light is refracted into the light transmissive film and refracted from the other surface. In this case, the ratio of the amount of light that is refracted into the light-transmitting film with respect to the amount of incident light on the surface and exits from the other surface is the angle of incidence of the incident light with respect to the normal at the point of incidence on the surface. Increases as the value decreases. Therefore, as in Patent Document 2, if the direction of the prism provided on the light guide space side surface of the light transmitting film is orthogonal to the traveling direction of the entire introduced light beam, almost all the light beams incident on the surface as shown in FIG. Of the two surfaces of each prism, the incident light beam enters the light source side surface, that is, the surface that reduces the incident angle with respect to the incident light beam, so that the incident angle is equal to the flat mirror surface or the direction of the prism. The incident angle is significantly smaller than the incident angle to the mirror surface having a row of protrusions in the direction perpendicular to each other. This greatly increases the ratio of emission to the incident light flux. As a result, the amount of light flux directed toward the central portion or the other end of the light guide space is rapidly reduced. This means that the light exiting surface of the “light guide space type surface emitting mechanism” and the light emitting surface of the light panel or backlight emit light with high uniformity in the direction perpendicular to the longitudinal direction of the light source. It is a decisive barrier.

In addition, in the above method, when a linear (particularly straight) array of LED packages is used as a light source, a large amount of emission occurs from the light transmitting film sandwiching the light guide space near the light source as described above. As a result, a strong band-like reflection of the light flux is produced on the light transmission film, light panel, backlight, etc. on the light exit surface near the light source.

From the above, it is difficult to obtain an illuminance distribution with a high degree of uniformity on the light exit surface by the method disclosed in Patent Document 2, and the same result was obtained in the experiments of the present inventors.
The “light guide space type surface emitting mechanism” disclosed in Patent Document 3 does not have a protrusion extending in a direction orthogonal to the direction in which the light beam from the light source travels in the light guide space as a whole as described above. Although the non-uniformity of light emission and light emission at the light emission surface of the “light-space type surface light emission mechanism” and the light emission surface of the light panel or backlight is greatly improved as compared with the above, the linear arrangement of LED packages is used as the light source. Is generated on the exit surface and the exit surface over the entire length in the traveling direction of the light beam.

As described above, according to the conventional technology, in the downlight that emits light from the LED, either “high light output efficiency” “sufficient reduction of glare”, linear arrangement of the LED package or straight tube type high intensity discharge tube. In light panels and backlights that can also be used as light sources, “High light output efficiency”, “Slight reduction of glare”, “Uniform light distribution illuminance distribution”, “Thin and lightweight structure with sufficient strength” There is nothing to realize all together.
The present invention is intended to solve all the above problems.

In downlights using LEDs or straight tube type high-intensity discharge tubes as light sources, or thin surface light emitting devices such as light panels, backlights, and other light irradiation devices, the luminous fluxes of the light sources are parallel to each other, and A cross section perpendicular to the longitudinal direction of each protrusion has a number of protrusions lined up sufficiently close to each other, and the shape and size thereof are constant, and the light passes through at least one mirror surface forming a part of a circle. When the LED is used as the light source, the light flux near the center line of the light flux of each LED package. When the straight tube type high-intensity discharge tube is used as the light source, the center of the light flux directed forward by the condensing reflector Basically, the light beam in the vicinity of the surface and in the vicinity of the orthogonal line to the longitudinal direction of the light source has a structure having an incident angle as large as possible with respect to the normal line on the incident light output plate.

Here, the “substantial mirror surface” can be defined as follows.
Incident light on a surface where the unevenness of a given surface of the structure is sufficiently smaller than the wavelength of the light is specularly reflected. On the other hand, if the unevenness is equal to or greater than the wavelength of the light, diffuse reflection (diffuse reflection) It is known to do. A surface that undergoes specular reflection is generally called a “mirror surface”. When most of the target surface is composed of “mirror surface” or “mirror surface” that is distributed almost uniformly, the ratio of the total area of the mirror surface to the area of the predetermined surface (referred to as mirror surface ratio) What is considered to be in a reasonable range in the application is defined as “substantial mirror surface”. For example, a mirror must have a specular reflection of the majority of incident light due to its required function, and the mirror rate will be approximately 0.9 or higher.

In the above basic structure, for a downlight using an LED as a light source, one of an ellipse, a parabola, a hyperbola, a part of another curve, or a line segment having a curved portion and a straight portion is rotated around one axis. A reflector having a bowl-like reflecting surface whose inner surface is a reflecting surface (hereinafter referred to as a bowl-like reflector), and an array of the protrusions on at least one main surface in the opening of the reflecting surface; A light emitting plate is arranged, and a plurality of LED packages are arranged at equal intervals on the circumference around the rotation axis, and the central part of each LED light beam is reflected by the reflecting surface of this bowl-shaped reflector, It has a mechanism to enter the light exit plate.

The mechanism is a method in which a plurality of LED packages arranged around the rotation axis are arranged in such a direction that the central portion of the light beam is directly incident on the reflecting surface of the bowl-shaped reflector or at an angle, or each LED package is arranged in the rotation axis direction. The central portion of the light beam is reflected by the reflector disposed in the vicinity of the rotation axis and is incident on the reflecting surface of the bowl-shaped reflector.

In the above structure, by increasing the diameter of the reflector and the light exit plate and increasing the concept of the light source, it is possible to obtain a general illuminator that illuminates a wider range beyond the illumination range of the conventional downlight.

Light panels, backlights, etc., where the linear arrangement of many LED packages or straight tube type high-intensity discharge tubes are used as the light source, and the light emission surface and light source have a positional relationship between the main surface and side surfaces of an assumed thin rectangular body Regarding the light irradiation device, there are at least two ridge surfaces of the basic structure, and at least a pair of the ridge surfaces are perpendicular to each other. One of the means based on such a basic structure is replaced with two light transmissive films which are functional structures of the light guide space type surface emitting mechanism of Patent Document 2, these are two thin light transmissive plates or films, The above-mentioned basic structure in which the opposing surfaces sandwiching the light guide space are both flat and substantially mirror surfaces, or one of them is a flat and substantially mirror surface and the other extends in a direction perpendicular to the longitudinal direction of the light source. Or a substantial mirror surface having a number of other ridges extending in parallel with each other, or both extending in the same direction as described above and parallel to each other. It shall be a substantial mirror surface having a protrusion. As another means based on the above basic structure, there is a single thin light transmitting plate which is a functional structure of the light guide space type surface emitting mechanism of Patent Document 3 and a reflection lightly bent at one central line portion. Instead of a plate, one sheet is a flat reflector, and the other sheet is a thin light transmission plate with a bent shape at the center line in a chevron or valley shape, or this is a flat surface relative to the vicinity of the light source The light guide plate is configured to be inclined toward the other end in the vicinity of the light source, thereby forming a thin light transmission plate that gradually approaches the planar reflection plate as the distance from the light source increases. The surface of the reflecting plate on the light guide space side and either or both of the surfaces of the thin light transmitting plate may have an array of protrusions of the basic structure extending in a direction perpendicular to the longitudinal direction of the light source. Good.

As a further means, instead of the reflector bent shallowly at one central line part in Patent Document 3, a protrusion in the basic structure is formed on the surface of the bent reflector facing the light guide space. A reflector having the direction of the ridge perpendicular to the center line, that is, perpendicular to the longitudinal direction of the light source, and a similar ridge on the surface facing the light guide space. A light-transmitting thin plate having the same protrusion direction as that described above is arranged to constitute a light guide space.

That is, all the above-mentioned means have protrusions extending in a direction perpendicular to the direction in which the light flux of the light source travels in the light guide space as shown in Patent Document 2, on any surface sandwiching the light guide space. That is not.

As for the downlight, the central part of the luminous flux of each LED package arranged near the central axis of the bowl-shaped reflector is reflected by this bowl-shaped reflector, and is directed toward the opening of the bowl-shaped reflector to widen the width of the luminous flux. However, some of them overlap each other in the vicinity of the opening. However, the luminous flux from each LED package still proceeds in different directions, so that the luminance distribution of each LED package remains, and the glare is not sufficiently reduced. Here, these light beams are incident on two incident lines of the projections described in the basic structure of the light-emitting plate disposed in the opening of the bowl-shaped reflector. Regardless of, it is diffused symmetrically with respect to each normal. Since the direction of each normal line is the same, many parts of each diffused light beam overlap each other, so that the light beam of each LED package is not visually recognized, and the glare is greatly reduced.

In addition, a band-like light distribution can be achieved by making the surface having the protrusions only have a predetermined protrusion direction.

A high light output efficiency can be obtained by using such a bowl-shaped reflector and a reflector in the vicinity of the rotation axis that has a high reflection efficiency, and a light output plate that has a high light transmittance.

For thin surface light emitting devices such as light panels, backlights, and other light irradiation devices, the light guide of these two thin plates is used in the “light guide space type surface emitting mechanism” in which one thin plate approaches the other thin plate. Since there is no protrusion extending in a direction orthogonal to the direction in which the introduced light beam travels in the light guide space as a whole on any surface facing the space, in the traveling direction of the light beam on the exit surface of the mechanism. The illuminance distribution is greatly uniformized.

In this case, when the light source is a linear array of LED packages, the light flux of the light source is incident on the thin plate of the mechanism including the direction of the LED package uniformly with a wide area as much as possible. The optical design of the structure can be made easier by arranging or attaching them.

In addition, the longitudinal direction of the light source until the light beam introduced into the light guide space type surface emitting mechanism using the linear arrangement of LED packages as the light source reaches the light exit surface of the light panel, backlight or other light irradiation device. The light fluxes of the LED packages sufficiently overlap with each other by passing through or reflecting the row of protrusions described in the basic structure extending in the direction perpendicular to the basic structure, and the diffused light fluxes before or after light emission. Since the directions of are substantially the same, these light beams are integrated, and the band-like reflection of the light beams is eliminated. By arranging the LED package so that the central portion of the introduced light beam is directly incident on the thin plate far from the light-emitting surface among the two thin plates of the mechanism, the band-like reflection of the light flux is minimized. It is more effectively resolved by way of the ridge surface.

In addition, the two thin plates that sandwich the light guide space asymptotically mean that the light beam introduced into the light guide space is incident on the surface of one of such thin plates, and almost all of the introduced light beam is from the mechanism. Emit and emit light. This resulted in high light emission efficiency.

As described above, the present invention uses a linear array of LED packages or a straight tube type high-intensity discharge tube as a light source, and in a “thin and lightweight structure with sufficient strength”, “high light output efficiency”, “ This is to realize “a sufficient reduction in glare” and “uniform light distribution illuminance distribution”.

It is a figure which shows advancing of the light which injects from the sparse medium A to the flat mirror surface of the dense medium B. FIG. It is a figure which shows advancing of the light which injects perpendicularly to the direction of a protrusion from the sparse medium A to the mirror surface of the row | line | column of the prism-shaped protrusion of dense medium B. FIG. 2 is a cross-sectional view of the LED illuminator according to Embodiment 1. FIG. It is sectional drawing of the LED illuminator of Embodiment 2. FIG. It is a figure which shows the illuminator which uses sunlight and LED of Embodiment 4 as a light source. It is a figure which shows the illuminator which uses sunlight and LED of Embodiment 4 as a light source. It is a figure which shows the LED illuminator of Embodiment 5. It is a figure which shows the LED illuminator of Embodiment 5. It is a figure which shows the light source structure part 54 in Embodiment 6. FIG. It is the exploded view and assembly drawing which show the light guide space type surface emitting mechanism of the thin surface light-emitting device in Embodiment 6. It is a figure which shows the light guide space type | mold surface emitting mechanism of the thin surface light-emitting device in Embodiment 6, and is a figure which shows the 1st light transmissive body 55. FIG. It is a figure which shows the light guide space type | mold surface emitting mechanism of the thin surface light-emitting device in Embodiment 6, and is a figure which shows the main surface which faces the outer side of the thin surface light-emitting device of the 3rd light transmission body 57. It is a figure which shows the light guide space type | mold surface emitting mechanism of the thin surface light-emitting device in Embodiment 6, and is a figure which shows the main surface which faces the 1st light transmission body of the 3rd light transmission body 57. FIG. It is a figure which shows the side surface structure part 59 in Embodiment 6. FIG. FIG. 16 is a diagram showing a first light transmission plate 65 in a seventh embodiment. FIG. 20 is an exploded view of a light guide space type surface emitting mechanism in an eighth embodiment. FIG. 20 is an exploded view of a light guide space type surface emitting mechanism in a ninth embodiment. FIG. 38 is an exploded view of the light guide spatial surface emitting mechanism in the tenth embodiment. FIG. 38 is an exploded view of the light guide spatial surface emitting mechanism in the eleventh embodiment. FIG. 32 is an exploded view of a light guide space type surface emitting mechanism in Embodiment 12.

Embodiments of the present invention will be described below with reference to the drawings.
Embodiment 1 FIG.
Six LED packages 1 having a maximum power consumption of 1.2 W and a total luminous flux of 80 lm / w are placed near one end of a hexagonal pipe 2 having a length of 25 mm and a side of 9 mm through a mounting bracket. A light source 3 is attached at an angle of 20 ° toward one end of the hexagonal pipe 2 as shown in FIG.
Elliptic ^{^{equations: x 2/66 2 + y}} 2/40 2 = 1
The center of the hexagonal pipe 2 is placed on the axis of rotation of the aluminum bowl-shaped reflector 4 with the curved surface in the range of −62 ≦ x ≦ −12 as the reflecting surface inside the bowl-shaped rotating surface rotated about the x axis. Attach the hexagonal pipe LED package 1 to the LED unit base 5 made of aluminum having a thickness of 3 mm and a diameter of 80 mm so that the axes are aligned and the center of each LED package 1 is located at x = −54 The lead wires are joined and attached to the casing 6 which also serves as a cylindrical heat sink having an inner diameter of 80 to 83 mm. A lighting power source 7 is accommodated in the space behind the reflector 4 and the LED unit base 5 of the casing 6, and a light diffusing and transmitting plate having a thickness of 2 mm and a diameter of 84 mm is provided in the vicinity of the opening of the bowl-shaped reflecting surface of the casing. 8 is attached.

Each main surface of the light diffusing and transmitting plate 8 has a plurality of ridges parallel to each other and arranged in close proximity to each other in a direction perpendicular to both surfaces, and a cross section perpendicular to the longitudinal direction of each ridge. It is a mirror surface that forms a part of a circle with a certain shape and size. The circumferential angle of the arc of the cross section is 160 °, the radius is 0.125 mm, and the center interval between the ridges is 0.25 mm.

The shape and size of the bowl-shaped reflector 4 and the mounting position and angle of the LED package 1 in the above structure are not limited to those described above, but are gathered at the positions where the light diffusing and transmitting plates 8 of all the LED packages 1 used as light sources are incident. It is sufficient if the light flux obtains sufficient uniformity. The luminous flux passes through the light diffusing and transmitting plate 8 so that the respective light distributions of the respective LED packages 1 substantially coincide with each other, so that light having a smooth light distribution can be obtained. That is, a downlight with less glare is obtained. The specifications and number of LED packages 1 are selected according to the required light quantity and energy efficiency of the illuminator. Further, by increasing the reflectance of the bowl-shaped reflector 4 and using a material having high light transmission efficiency for the light diffusion transmission plate 8, high light output efficiency is obtained.

Embodiment 2. FIG.
4 of FIG. 4 integrates the bowl-shaped rotating surface and the outer surface of the small-diameter cylindrical structure around the rotation axis, and the inner surface of the bowl-shaped rotating surface and the outer side of the cylindrical structure 12 are arranged. An aluminum reflector having a reflecting surface with which the reflecting surface 12-1 is integrated is shown.

The diameter of the opening of the reflecting surface of the reflector 14 is 300 mm, the height is 90 mm, the height of the cylindrical structure 12 is 40 mm, the diameter of the tip of the cylindrical structure is 20 mm, and the outer surface (outer peripheral surface) Is a part of a conical surface that expands at an angle of 10 ° from the tip, and has a shape that is integrated with the bowl-shaped reflecting surface with a smooth curved surface.

Twelve LED packages 11 of the same standard as in Embodiment 1 are arranged at equal intervals on the circumference of 80 mm in diameter centered on the same axis at a position 20 mm from the tip of the cylindrical structure portion 12, and the surface of each LED package 1 is arranged. It attaches via an attachment metal fitting in parallel with this rotation axis. Each mounting bracket has a lead wire of each LED package 1, and is attached to the LED unit base 15 made of aluminum having a thickness of 3 mm and a diameter of 302 mm behind the reflector 14 through the hole of the reflector 14. Join.

The LED unit substrate 15 is attached to a casing 16 that also serves as a cylindrical heat sink having an inner diameter of 302 to 305 mm. A lighting power supply device 17 is accommodated in the space behind the reflector 14 and the unit substrate 15 of the casing 16, and light diffusion with a thickness of 2 mm and a diameter of 306 mm is performed near the opening of the bowl-shaped reflector 14 of the casing 16. A transmission plate 18 is attached.
Both surfaces of the light diffusing and transmitting plate 18 have the same protruding surface as in the first embodiment.

The shape and size of the bowl-shaped reflector 14 and the mounting position and angle of the LED package 11 in the above structure are not limited to those described above, and the center of the luminous flux of each LED package 1 is near the rotation axis of the bowl-shaped reflector 14. Directly incident on the reflecting surface 12-1 positioned facing outside, the reflected light enters the bowl-shaped reflecting surface outside the reflecting surface, and the reflected light beam travels toward the light diffusion transmission plate 18, As long as the collective luminous flux of the light fluxes of the LED packages 1 at the position incident on the light diffusing and transmitting plate has sufficient uniformity, an LED illuminator with less glare can be obtained as in the first embodiment. The specifications and number of LED packages 1 are selected in the same manner as in the first embodiment. The light output efficiency is the same as that in the first embodiment.

The above structure enables the production of large-diameter downlight type illuminators with high light output efficiency and greatly reduced glare.

Embodiment 3 FIG.
In the first and second embodiments, instead of the light diffusing and transmitting plates 8 and 18, the protrusions are arranged only on one main surface, or both main surfaces have the same direction between the main surfaces. A light diffusing and transmitting plate having a row of ridges is used.
As a result, a downlight and a large-diameter illuminator having a light distribution with little spread to one side can be obtained.

Embodiment 4 FIG.
In the method of transmitting sunlight collected on the roof, roof, or wall of a building indoors through a cylindrical or pipe-like structure and using it for indoor lighting, the hexagonal pipe 2 of the first and third embodiments. Instead of the cylindrical structure portion 12 of the bowl-shaped reflector 14 of the second and third embodiments, such a structure using the tip portion 22 of the above-mentioned cylindrical or pipe-shaped structure for solar transmission as shown in FIGS. A plurality of LED packages 21 are arranged at the front end portion 22 of the body, or a reflector 22-1 is arranged on such a structure, and a plurality of LED packages 1 are arranged on the outer circumference as shown in FIG. By having the same mechanism as in the first and third embodiments and the second and third embodiments, an illuminator using both the sun and the LED as a light source is created.

Embodiment 5 FIG.
As shown in FIGS. 7 and 8, the cross section perpendicular to the central axis of the cylinder of the structure forming part of the cylinder is the same as in FIG. 3 or FIG. Each of the LED packages 1, the reflecting surface of the reflecting member 34 in FIG. 7, the reflecting surface 42-1 in FIG. 8, and the light diffusing and transmitting

plates

38 and 48. The arrangement on the cross section is the same as that on the cross section of the first to third embodiments. The

reflector

34 or 44 is used until the central portion of the light flux of each LED package 1 reaches the first reflection or in the reflection. The second light diffusing / transmitting

plates

39 or 49 having the ridge surfaces so as to pass through the same row of ridges as in the first embodiment extending in the direction perpendicular to the axis of the cylinder that is a part of each are shown in the figure. 7 and 8, the light-emitting surface is elongated, but it can withstand outdoor wind pressure. With the partial structural strength, less glare, LED illuminator can be obtained having a uniform light distribution.

Embodiment 6 FIG.
As shown in FIG. 9, an LED unit 52 arranged in a line on a substrate having 36 LED packages 51 having a maximum power consumption of 1.2 w and a total luminous flux of 80 lm / w, a thickness of 2 mm, a width of 16 mm, and a length of 564 mm. Is attached to a condensing mirror portion 53 made of aluminum that also serves as a heat sink having a height of 33 mm, a width of 28 mm, and a length of 597 mm.

A pair of light source structures 54 are arranged in parallel with each other at an interval of 540 mm with the LED package 51 inside. As shown in FIG. 10a, a planar first light transmission plate 55 made of polycarbonate having a thickness of 1.5 mm, a width of 566 mm on the light source structure 54 side, and a length of 556 mm is formed on the step above the light source structure 54. A light transmission plate made of polycarbonate having a thickness of 1.5 mm, a width of 556 mm on the side of the light source structure 54 and a length of 557 mm is arranged in a line extending in the length direction. Then, the second light transmitting plate 56 bent at a gradient of 1/15 is disposed so as to be fitted into a step below the light source structure portion 54 with its crest-side surface facing the first light transmitting plate 55.

The principal surfaces of the first light transmission plate 55 and the second light transmission plate 56 facing each other are both mirror surfaces, and as the distance from the LED unit 52 as the light source increases, these main surfaces gradually approach. The space between the two plates asymptotic to each other is referred to as a “light guide space”, and the light flux of the light source introduced into this space passes through the first and second light transmission plates 55 as the light guide space travels. The asymptotic structure of these two plates and the light source form a “light guide space type surface emitting mechanism”. Third light made of a polycarbonate having a thickness of 1.5 mm, a width of 566 mm on the light source structure 54 side, and a length of 556 mm outside the first light transmission plate 55 of the light guide space type surface emitting mechanism. A transmissive plate 57 is fitted into the upper step of the light source structure 54 and arranged on the outside of the second light transmissive plate 56 of the light guide space type surface emitting mechanism. Are attached to the lower surface of the light source structure 54 with the reflecting surface facing inward. The main surface outside the light guide space of the first light transmission plate has a plurality of protrusions extending in parallel with each other and extending sufficiently perpendicular to the longitudinal direction of the LED unit 52 as shown in FIG. 10b. The cross-section perpendicular to the longitudinal direction of each protrusion is a mirror surface that forms a part of a circle with a certain shape and size, and is the main surface on the outer side of the third light transmission plate 57 ( As shown in FIG. 10c, the main surface on the side not facing the first light transmission plate has a plurality of protrusions extending in the longitudinal direction of the LED unit 52 and parallel to each other and arranged sufficiently close to each other. The cross section perpendicular to the longitudinal direction is a mirror surface that forms a part of a circle with a certain shape and size. In addition, the first light transmission plate 55 of the third light transmission plate 57 has a main surface facing the outside of the light guide space of the first light transmission plate 55 regardless of whether or not it has such a protruding surface. As shown in FIG. 10 d, the main surface that faces may have the same ridge with the direction in which the ridge extends perpendicular to the longitudinal direction of the LED unit 52. Further, when the main surface outside the light guide space of the first light transmission plate 55 has a direction in which the protrusions extend perpendicular to the longitudinal direction of the LED unit 52, the third light You may have the said row | line | column of the said protrusion orthogonal to the protrusion of the 1st light transmissive board 55 on both surfaces of the transmission board 57. FIG.

A stepped portion of a side structure 59 whose cross section is shown in FIG. 11 is inserted between the first light transmission plate 55 and the reflection plate 58 on the side surface orthogonal to the light source structure 54 of this structure, and the thickness is 1.5 mm. The first, second, and third

light transmission plates

55, 56, and 57 and the reflection plate 58 are fixed from above and below by two sets of L-shaped frames, and a thin surface that is 36.5 mm x and 600 mm square. Get a light emitting device. *

The dimensions are selected according to the required thickness of the outer shape and the size of the light-emitting surface except for the protrusions in the above. However, the uniformity of the illuminance distribution on the light exit surface is improved as the thickness is smaller than the size of the light exit surface. Alternatively, the first and second

light transmission plates

55 and 56 may be interchanged, or both the first and second light transmission plates may be similarly bent with a smaller gradient than the second light transmission plate.
The light source is not limited to the LED, and a straight tube type high intensity discharge lamp can also be used.

The central angle of the arc that is a part of the cross-sectional circle perpendicular to the longitudinal direction of the ridge is 160 °, and the center interval between the ridges is 0.25 mm. In practical use, the central angle is required to be 140 ° or more and the center interval is 2 mm or less, and as a function thereof, a light beam incident so as to form an acute angle in the longitudinal direction of the ridge is a structure having such a ridge surface. When the transparent plate is a transparent plate, the transmitted light and the reflected light are combined and diffused into a conical surface, and when the structure having such a protruding surface is a reflective plate, the reflected light is diffused into a semi-conical surface. . Further, the luminance distribution of the diffused light beam can be made more uniform by selecting the circumferential angle of the ridge surface, the maximum diameter, and the degree of proximity between the ridges. The protrusions of the first to fifth embodiments have the same function. Further, since the arrangement of these protrusions sufficiently close to each other is for the purpose of causing the light diffraction phenomenon, the diffraction grating interval must be larger than the wavelength of visible light. The interval will be reasonable.

Embodiment 7 FIG.
In the sixth embodiment, instead of the first light transmission plate 55, the main surfaces facing the light guide space are parallel to each other and extend sufficiently perpendicular to the longitudinal direction of the LED unit 52 as shown in FIG. A thin surface light-emitting device is created using the first light transmission plate 65 that is a substantial mirror surface having a large number of prism-shaped protrusions arranged in close proximity.

In addition, instead of the first light transmitting plate 55 instead of the second light transmitting plate 56 in the above, a light transmitting plate 66 similar to the above is used to produce a thin surface light emitting device. The protrusions of the surface facing the outside of the light guide space of the first light transmission plate 65 and the main surface of the third light transmission plate 67 are the same as in the sixth embodiment. In addition, the protrusion is not limited to the above as long as the protrusion surface is a substantial mirror surface, and may be the same as that described in the sixth embodiment, or other things.

In any case, although the uniformity of the illuminance distribution on the light emitting surface is slightly inferior to that of the sixth embodiment, the band-like reflection of the light flux of each LED package 1 on the light emitting surface disappears completely.

Embodiment 8 FIG.
In the sixth and seventh embodiments, the reflecting plates 58 and 68 are not used, and instead of the second light transmitting plates 56 and 66, one main surface is formed on one main surface as shown in FIG. A light transmitting plate having a row of ridges, the direction of the ridges being perpendicular to the longitudinal direction of the LED unit 52, and the ridge surface from the center line of the light transmissive plate in the direction of the ridges to the mountain side A thin surface light emitting device having a bent shape and having the other main surface as a flat, substantially mirror surface and subjecting the main surface to aluminum vapor deposition to be used as the reflector 78 is produced.

In this case, the aluminum vapor deposition may be performed on the protruding surface of the light transmitting plate. The protrusion of the reflector 78 may be the protrusion of the sixth or seventh embodiment as long as the protrusion surface is a substantial mirror surface. The first light transmission plate in this embodiment is designated as 75.

Embodiment 9 FIG.
In the seventh and eighth embodiments, the third light transmission plate is not disposed, and instead of the first

light transmission plates

65 and 75, the main surface facing the light guide space of the light transmission plate is shown in FIG. As described above, the arrangement of the ridges similar to the arrangement of the ridges in the sixth embodiment is such that the extending direction of the ridges is orthogonal to the longitudinal direction of the LED unit 72, and the other main surface is an arrangement of the same ridges. The first light transmission plate 85, which is a mirror surface respectively, is arranged orthogonally to the above-described protrusions, and a thin surface light emitting device having this as the light emitting surface is produced.

Embodiment 10 FIG.
In the sixth and seventh embodiments, as shown in FIG. 15, the second light transmitting plates 56 and 66 are formed in a single plane, and instead of the first

light transmitting members

55 and 65 of the same embodiment, a pair of A thin surface light emitting device in which a first light transmission plate 95 having a structure in which the mountain side surface of the LED unit 52 is bent so as to face the single planar second light transmission plate 96 is disposed. Create a device. The dimensions of the first and second light transmission plates are adjusted according to such a structure.

Embodiment 11 FIG.
The reflectors in the sixth, seventh, ninth, and tenth embodiments are not arranged, and instead of the second light transmission plate in the tenth embodiment as shown in FIG. 16, a single planar reflector 108 is used. A thin surface light emitting device having a structure in which is arranged. Such a reflector 108 may be obtained by the same method as in the eighth embodiment.

Embodiment 12 FIG.
In the tenth and eleventh embodiments, as shown in FIG. 17, the third light transmission plate is not disposed, and both main surfaces of the first light transmission plate have the same row of protrusions as in the ninth embodiment. A thin surface light emitting device having a mirror surface and using this as a light emitting surface is created.

In Embodiments 6 to 12, the illuminance of the light emitting surface is more effectively adjusted by adjusting the mounting angle of the LED unit so that the central portion of the light flux of the LED package does not directly enter the first light transmission plate. The distribution can be made uniform.
In any embodiment, the light transmission plate may be a light transmission film.

A A sparse medium B A

dense medium

1, 11, 21, 31, 41, 51 LED package 2 Hexagonal pipe 12 Tubular structure portion 12-1 Reflecting surface 22 of the tubular structure portion 12 Tubular or pipe-shaped structure 22 -1 Reflector 42-1 Reflecting surface 3 Light source 4 Sponge-shaped

reflectors

14, 24, 34, 44

Reflector

5, 15

LED unit base

6, 16

Housing

7, 17 Lighting

power supply device

8, 18, 28, 38 , 48 Light diffusing and transmitting

plates

39, 49 Second light diffusing and transmitting plate 52 LED unit 53 Condensing mirror portion 54 Light

source structure portions

55, 65, 75, 85, 95, 105, 115 First

light transmitting plates

56, 76 , 86, 96 Second

light transmission plate

57, 77, 97, 107 Third

light transmission plate

58, 88, 98

Reflection plate

78, 108, 118 Reflector

Claims

A reflector having a saddle-like reflecting surface inside the plane of rotation of one of an ellipse, a parabola, a hyperbola, or a part of another curve or a line segment that combines a curve and a straight line;
In the vicinity of the opening of the bowl-shaped reflection surface, the light transmission plate has a large number of protrusions arranged on both main surfaces thereof in parallel and sufficiently close to each other,
The cross-section perpendicular to the longitudinal direction of each protrusion forms a part of a circle with a certain shape and size, and is a substantial mirror surface including the surface of the protrusion, between the two main surfaces. And a plurality of LED packages are arranged at equal intervals on the circumference around the rotation axis of the bowl-shaped reflecting surface, and the light fluxes of the LED packages are An illuminator characterized by a mechanism in which a light beam in the vicinity of a center line is directly incident on the reflecting surface, is reflected, is incident on the light diffusing and transmitting plate, and is emitted from one surface thereof.
The reflector having the hook-like reflecting surface and the reflector having the outer surface of the small-diameter cylindrical structure as a reflecting surface are arranged so that the rotation axis of the hook-like reflecting surface and the central axis of the cylindrical structure coincide with each other. Alternatively, a plurality of LED packages are arranged at equal intervals on one turn around the rotation axis with the reflecting surface of the cylindrical structure facing the center, and the light flux near the center line of the light flux of each LED package 2. The apparatus according to claim 1, further comprising a mechanism that directly enters the reflecting surface, the reflected light enters the bowl-shaped reflecting surface, is reflected, and is incident on the light diffusion transmission plate. Illuminator.
In place of the light diffusing and transmitting plate, only one main surface has the protruding arrangement, or both main surfaces have the light diffusing and transmitting plate having the protruding arrangement in the same direction between the main surfaces. The illuminator according to claim 1 or 2, characterized by the above.
Align the rotation axis of the reflecting surface of the bowl-shaped reflector with the central axis of the cylindrical or pipe-like structure that transmits the sunlight collected into the room, and insert the tip of the cylindrical body into the bowl-shaped reflector. Or a structure in which a plurality of LED packages are arranged on the outer peripheral surface of the tip portion in the bowl-shaped reflector of the pipe-shaped structure so as to face the reflection surface of the bowl-shaped reflector. Item 4. The illuminator according to item 1 or 3.
Align the rotation axis of the reflecting surface of the bowl-shaped reflector with the central axis of the cylindrical or pipe-like structure that transmits the collected sunlight into the room, and insert the tip of the pipe-shaped reflector into the bowl-shaped reflector. A reflector is disposed on the outer periphery of the end of the cylindrical or pipe-like structure in the body, the reflective surface thereof is directed toward the reflective surface of the bowl-shaped reflector, and a plurality of LED packages are disposed on the outer periphery of the reflector. The illuminator according to claim 2 or 3, wherein the light source is sunlight and LED characterized by being arranged toward the reflecting surface of the reflector on the outer peripheral surface of the pipe-like or pipe-like structure.
Instead of the bowl-shaped reflecting surface, a cylindrical part having the same cross-sectional structure is used as a reflecting surface, the LED package is arranged at the position of the same cross-section in the axial direction of the reflecting surface, and the light diffusing and transmitting plate is disposed above. The illuminator according to any one of claims 1 to 3, wherein the illuminator has a structure arranged in an opening of the reflecting surface.
A linear array of LED packages or a straight tube type high-intensity discharge tube is used as a light source, which is disposed in the vicinity of a pair of opposing side surfaces of a generally thin rectangular housing, and between the pair of light sources. The first and second light transmission plates or films are arranged in parallel to the longitudinal direction of the respective light sources, and in the vicinity of the light sources at intervals exceeding the width of the light emitting portion of the light sources. Alternatively, both of the films or at least the second light transmission plate or film are formed of an inclined surface portion or an inclined curved surface portion that is bent at an intermediate line portion between the pair of light sources, so that one of the light transmission plates as the distance from the light source increases. Has a structure that is asymptotic to the other or to each other, and the principal surfaces opposed to each other across the light guide space sandwiched between the first and second light transmission plates or films are flat mirror surfaces, and the light guide space The light flux of the light source is introduced into the first and second A light guide spatial surface emitting mechanism that emits light from the main surface of the second light transmissive plate or film, and a third light transmissive plate or film outside the first light transmissive plate of the mechanism. A reflecting plate is arranged outside the transmitting plate or film with its reflecting surface facing the second light transmitting plate or film, and at least one of the main surfaces facing each other of the first and third light transmitting plates or films. The main surface is a substantial mirror surface having a plurality of protrusions extending in parallel to each other and extending in a direction perpendicular to the longitudinal direction of the light source, and is the main surface of at least one of the third light transmission plate or the film. A thin surface light emitting device characterized in that the surface is a substantially mirror surface having a plurality of protrusions extending in parallel with each other and extending in the longitudinal direction of the light source.
At least one of the opposing surfaces of the first and second light transmission plates or films of the light guide space type surface emitting mechanism is parallel to each other extending in a direction perpendicular to the longitudinal direction of the light source, and many adjacent to each other. The thin surface light emitting device according to claim 7, wherein the thin surface light emitting device is a substantially mirror surface having a plurality of protrusions.
Instead of the second light transmission plate or film, the second light transmission plate or the film is provided, and the second light transmission plate or the film has a reflection plate formed of an inclined surface portion or an inclined curved surface portion that is bent from an intermediate line portion between the pair of light sources. 9. The thin surface light emitting device according to claim 8, wherein the surface is a mirror surface having a plurality of protrusions extending parallel to each other and extending in a direction perpendicular to the longitudinal direction of the light source.
There is no third light transmission plate or film, and at least one main surface facing the light guide space of the first and second light transmission plates or film, or at least one main surface of the reflection plate Is a mirror surface having a number of protrusions extending in parallel with each other and extending in a direction perpendicular to the longitudinal direction of the light source, and the main surface not facing the light guide space of the first light transmission plate is the above-mentioned 10. The thin surface light emitting device according to claim 8, wherein the protrusion is a mirror surface having a direction of the protrusion perpendicular to the direction of the protrusion, and is used as a light output surface. 10.
9. The thin surface light emitting device according to claim 7 or 8, wherein the second light transmission plate or film is a single flat surface.
The thin surface light emitting device according to claim 7 or 8, wherein a space between the first light transmission plate and the reflection plate is used as a light guide space without the second light transmission plate.
The main surface facing the light guide space of the first light transmissive plate or film does not have a third light transmissive plate or film, and the alignment of the ridges and the direction in which each ridge extends is the longitudinal direction of the light source. The other main surface is a mirror surface having the row of the protrusions in the same direction as the longitudinal direction of the light source, and the other main surface is a light exit surface. The thin surface light emitting device according to claim 11 or 12.
An arrangement of at least one pair of protrusions orthogonal to each other of the main surface facing the outside of the light guide space of the first light transmission plate or film and each main surface of the third light transmission plate or film is as follows. The cross section perpendicular to the longitudinal direction of the strip forms a part of a circle with a certain shape and size, and the surface thereof is a mirror surface together with the main surface having such protrusions. 7. A thin surface light emitting device according to 7-9, 11 and 12.
An arrangement of at least one pair of protrusions orthogonal to each other of the first light transmission plate or main surface of the film and the main surface of the second light transmission plate or film facing the light guide space, or the first light The arrangement of at least one pair of protrusions orthogonal to each other on the main surfaces of the transmission plate or film and the reflection plate is substantially circular with a cross-section orthogonal to the longitudinal direction of each protrusion having a certain shape and size. The thin surface light emitting device according to claim 10, wherein the surface is a mirror surface together with a main surface having such protrusions.
The arrangement of the protrusions on each main surface of the first light transmission plate or film is such that the cross section perpendicular to the longitudinal direction of each protrusion forms a part of a circle with a certain shape and size, and the surface thereof. The thin surface light emitting device according to claim 13, wherein the surface light emitting device is a mirror surface together with a main surface having such protrusions.
An arc that is a part of a circle having a cross-section perpendicular to the longitudinal direction of the ridge has a circumferential angle of 140 ° or more, and light rays incident so as to form an acute angle in the longitudinal direction of the ridge are such ridge surfaces. In the case where the structure having a transparent plate is a transparent plate, the transmitted light and the reflected light are combined and diffused into the conical surface stripe. When the structure having the protruding surface is a reflection plate, the reflected light has a semi-conical surface shape. The thin surface light emitting device according to any one of claims 14 to 16, wherein
The thin surface light emitting device according to any one of claims 14 to 16, wherein a center interval of the protrusions is 1 μm to 2 mm.
The thin surface light-emitting device according to any one of claims 7 to 18, wherein the thin surface light-emitting device has a structure obtained by dividing a structure excluding the housing of the thin surface light-emitting device by a center line between the pair of light sources.