JP5188077B2 - Light direction changing element and planar light emitting device - Google Patents

Description

The present invention relates to a light redirecting element and a planar light emitting device used for a light source of a display backlight or lighting equipment.

  Conventionally, backlights such as signboards and televisions, lighting equipment, etc. have used light bulbs and fluorescent lamps as light sources, but they are small in size, can save energy, and do not contain environmentally hazardous substances. As a result, it has become possible to replace LEDs with light bulbs and fluorescent lamps.

  On the other hand, a large and thin planar light source is required from the market. If the light source can be made thin, the space of the light source can be saved, and the light source can be installed in a place that could not be installed conventionally. For example, it is possible to illuminate a poster that has conventionally only been illuminated with external light from the inside.

As a planar light source using an LED, a lens having a funnel portion on the upper surface and a sawtooth ridge on the side peripheral surface is placed on the LED chip so that the light from the LED chip is almost perpendicular to the package axis. LED packages and light emitting diodes are known (see, for example, Patent Documents 1 and 2).
Japanese Patent Application No. 2003-8068 Japanese Patent Application No. 2003-8081

  However, according to the conventional LED package, since the lens emits light from the LED chip so as to be parallel to the LED chip mounting surface, the light is emitted upward from the center of the LED chip. In comparison, the amount of light from the oblique direction decreases. For this reason, light emission unevenness (color unevenness) occurs in the light emitted from the lens.

Accordingly, an object of the present invention is to provide a light direction changing element and a planar light emitting device which do not cause uneven light emission and uneven color in emitted light.

The present invention, in order to achieve the above object, a columnar body having a light transmitting property provided on one surface of the front Symbol pillar-shaped body, an incident surface on which light is incident, the center of the other surface of the columnar body a central reflecting surface causes reflected laterally of the columnar body incident light from the incident surface with provided, reflects or transmits the light reflected from said central reflecting surface with provided on the periphery of the central reflecting surface an inclined reflective surface, characterized in that a flat reflecting surface for reflecting light reflected from the said central reflecting surface provided on one surface of the pillar-shaped body excluding the incident surface and the inclined reflecting surface A light redirecting element is provided.
In order to achieve the above object, the present invention provides a substrate, a light source provided on the substrate,
Provided is a planar light emitting device including the light direction conversion element fixed on the substrate with a gap provided between the light source and the incident surface.

According to this structure, the incident light entering through the recess from the light source is reflected or transmitted by the morning glory shape reflecting surface (middle reflecting surface), the inclined reflecting surfaces from the reflected light and morning glory shape reflecting surface by a morning glory shape reflecting surface The reflected light that has passed through is emitted in a direction of 360 ° substantially perpendicular to the optical axis of the light source. Further, the reflected light from the flat reflection surface from the morning glory shape reflection surface and the inclined reflection surface is reflected toward the morning glory shape reflection surface.

  According to the light redirecting element of the present invention, it is possible to prevent emission unevenness and color unevenness from occurring in the emitted light.

[First Embodiment]
(Configuration of planar light emitting device)
1A and 1B show a planar light emitting device according to a first embodiment of the present invention, in which FIG. 1A is a plan view and FIG. 1B is a cross-sectional view taken along line AA in FIG.

  The planar light emitting device 1 includes a substrate 10, an LED 11 as a light source provided at a predetermined position on the substrate 10, and a light direction conversion element 12 fixed on the substrate 10 with an adhesive or the like so as to cover the LED 11. It is configured with.

  Since LED11 produces | generates a white type | system | group with mixed color light, it is preferable to make emission wavelength into 400 nm or more and 530 nm or less considering the complementary color relationship with the emission wavelength from fluorescent substance, deterioration of translucent resin, etc. For example, an element made of a GaN-based compound semiconductor having an emission wavelength of 450 to 460 nm can be used.

  The light redirecting element 12 has, on the upper surface, a B surface formed by a conical rotating paraboloid 12a with the LED 11 as the center. Furthermore, the periphery of the upper surface of the light direction conversion element 12 is cut obliquely to form an inclined reflection surface (E surface).

  Further, the light redirecting element 12 is formed with a concave portion 12b having a flat A surface facing the LED 11 on the lower surface, and the side surface is processed into a vertical surface with respect to the substrate 10 to constitute a C surface. ing. A gap g is provided between the lower surface of the recess 12 b and the upper surface of the LED 11.

  Further, the light direction conversion element 12 has a flat reflection surface (D surface) formed of a reflection film or the like on the lower surface except the recess 12b, and is configured to reflect the reflected light from the B surface. The planar reflection surface (D surface) may be formed on the surface of the substrate 10 instead of the light direction conversion element 12. The light redirecting element 12 having the above-described shape is a transparent material, and a resin such as acrylic resin, polycarbonate, epoxy resin, silicone, or glass can be used.

(Configuration of LED)
FIG. 2 shows a detailed configuration of the LED. The LED 11 is made of a resin made of a resin package 110 having a recess 110a at the center, a blue LED element 111 provided at the bottom of the recess 110a, and a phosphor 112, and is filled with the recess 110a. The sealing resin 113 is filled, and one end is connected to an electrode pad (not shown) of the blue LED element 111 and the other end is provided with leads 114A and 114B drawn out of the package 110. .

  In order to obtain white light in combination with the blue LED element 111, the phosphor 112 is powdered and mixed with the sealing resin 113, and an inorganic fluorescent material or an organic fluorescent material can be used. Examples of the inorganic fluorescent material include a material containing a rare earth element.

Specifically, there is a YAG (yttrium, aluminum, garnet) phosphor, which includes at least one element selected from the group consisting of Y, Lu, Sc, La, Gd, and Sm, Al, Ga, and A garnet phosphor activated with cerium containing at least one element selected from the group consisting of In. For example, Y ₃ Al ₅ O ₁₂ : Ce.

(Operation of planar light emitting device)
In FIG. 2, when a DC voltage is applied between the leads 114 </ b> A and 114 </ b> B in accordance with the polarity of the blue LED element 111, a drive current flows through the blue LED element 111. When the drive current flows, the blue LED element 111 emits blue light and emits the blue light into the sealing resin 113. Part of the blue light incident on the sealing resin 113 is absorbed by the phosphor 112, and the remaining light passes through the sealing resin 113 as it is.

  The phosphor 112 absorbs blue light and converts it into yellow light. The yellow light and the blue light transmitted through the sealing resin 113 are mixed to become white light in the course of traveling, and enter the A surface of the light redirecting element 12 shown in FIG.

  Thereafter, the light is incident on the B surface, the C surface, and the E surface and reflected, or passes through each surface and is emitted from the light direction conversion element 12 to the outside. Reflected light from the B surface and the E surface is reflected by the D surface, reaches the B surface, and exits from the B surface to the outside.

(Effects of the first embodiment)
According to the first embodiment, the following effects are obtained.
(A) Since the light from the LED 11 is reflected in various directions by the B surface (rotary paraboloid 12a) of the light direction changing element 12, there is no emission region biased to blue light or yellow light, and It is possible to prevent uneven emission.
(B) Since the gap g is provided between the inner surface of the recess 12b of the light redirecting element 12 and the LED 11, the inner surface of the recess 12b does not contact the LED 11 even when pressure is applied to the light redirecting element 12. The LED 11 can be prevented from being damaged.
(C) The light from the LED 11 (light source) can be reflected by the D surface in addition to the horizontal direction and emitted upward from the light direction conversion element 12 so that the light from the oblique direction of the LED 11 can be efficiently emitted. it can.
(D) Since light can be emitted also from the upper surface of the light redirecting element 12, even when the planar light emitting device 1 is thinned, a surface light source with uniform emitted light can be obtained. Incidentally, when light is emitted entirely from the side surface of the planar light emitting device 1, the portion directly above the light source becomes dark.
(E) Since the light redirecting element 12 can be mounted on the substrate 10 for each LED 11, the productivity can be improved.

[Second Embodiment]
3A and 3B show a planar light emitting device according to a second embodiment of the present invention, in which FIG. 3A is a plan view and FIG. 3B is a cross-sectional view taken along line BB in FIG. In the first embodiment, the planar light emitting device 1 uses the light direction conversion element 13 in which the shape of the light direction conversion element 12 is changed, and the light direction conversion element 13 is formed by a transparent and cylindrical fixture 14. The other configuration is the same as that of the first embodiment.

  The light redirecting element 13 has a flat upper surface, a lower surface having a paraboloid of revolution (B surface), and a cross-sectional shape of an inverted Mt. Fuji shape. The center of the rotating paraboloid (B surface) is set to match the center of the LED 11. On the rotating paraboloid (B surface), a plating film 15 serving as a reflecting surface is provided by vapor deposition or the like. Since the light redirecting element 13 is coated with the plating film 15, it may not be a transparent material, and a resin such as polycarbonate can be used. Note that the upper surface of the light redirecting element 13 may not be flat.

  The operation of the planar light emitting device 1 in the present embodiment will be described. The LED 11 emits light when a driving current is passed, and yellow light and blue light from the phosphor 112 and the sealing resin 113 of the LED 11 shown in FIG. Is emitted toward the light direction changing element 13.

  The blue light and the yellow light are mixed to become white light in the process of traveling, and the white light is incident on the rotating paraboloid (surface B) of the light direction changing element 13 and is in a direction substantially perpendicular to the optical axis of the LED 11, That is, it reflects in the direction of 360 degrees in the horizontal direction. The white light incident on the B surface of the light redirecting element 13 is reflected one or more times on the B surface, then passes through the fixture 14 and is emitted to the outside.

(Effect of the second embodiment)
According to the second embodiment, the following effects are obtained.
(A) While having the effect (a) in the first embodiment, the light from the LED 11 can be uniformly emitted to the entire side surface direction (horizontal direction).
(B) Since the light from the LED 11 is converted to the side surface direction by the light direction conversion element 13, it is possible to prevent a light spot from being generated upward.
(C) Since the light direction conversion does not use total reflection, it can be reduced in size by being able to have an arbitrary shape, and the light emission direction can be changed.
(D) The light directed upward of the LED 11 is strong, and a light spot is formed at the right upper portion where the distance is small. However, according to the present embodiment, the light spot is eliminated by reflecting the light sideways. A uniform surface light source can be made.

[Third Embodiment]
4A and 4B show a planar light emitting device according to the third embodiment of the present invention, in which FIG. 4A is a plan view and FIG. 4B is a cross-sectional view taken along line CC in FIG.

  In the second embodiment, the planar light emitting device 1 uses three LEDs, a red LED 16, a green LED 17, and a blue LED 18, instead of the LED 11, and the center portion is fixed to the substrate 10 instead of the light direction conversion element 13. The light direction conversion element 20 having the configuration as described above is used, and the fixture 14 is further removed. The other configuration is the same as that of the second embodiment. In addition, although the board | substrate 10 is set as the structure which bonded together 2 sheets, 1 sheet | seat or a multilayer structure may be sufficient.

  The light redirecting element 20 is made of a resin or the like, and a plating film 15 is provided on the surface of the paraboloid (B surface). The plating film 15 faces the substrate 10 side so as to face the substrate 10 side. Fixed to.

  Further, the light redirecting element 20 has a tip surface formed by cutting a predetermined portion at the tip of the center portion of the B surface, and the tip surface is fixed to the substrate 10 by a screw 19. A screw hole 10a is provided in the substrate 10 so that the screw 19 can be inserted. Since the light redirecting element 20 is coated with the plating film 15, it does not have to be a transparent material, and a resin such as polycarbonate can be used.

  The red LED 16, the green LED 17, and the blue LED 18 have substantially the same light output, and are arranged at equal intervals around the tip of the light direction changing element 20 as shown in FIG.

  In the present embodiment, instead of the red LED 16, the green LED 17 and the blue LED 18, three LEDs 11 (same emission color) having the configuration shown in FIG. 2 may be used.

  Next, the operation of the planar light emitting device 1 in the present embodiment will be described. The LEDs 16 to 18 emit light when a driving current is passed, and the three colors of light emitted from the LEDs 16 to 18 are emitted toward the light direction changing element 20, and each light passes through the space and is plated on the light direction changing element 20. The light is incident on the surface 15 (surface B), reflected by the plating film 15 and emitted outward, or the light of a plurality of planar light emitting devices is mixed with the other two colors to become white light.

(Effect of the third embodiment)
According to the third embodiment, the following effects are obtained.
(A) Since the planar light emitting device 1 is configured using LEDs of three colors of RGB as a light source, the planar light emitting device 1 can be configured to have no phosphor. In addition, by mounting three LEDs in the planar light emitting device 1, the planar light emitting device 1 can have higher power than the first and second embodiments. The RGB color mixture is improved, and the backlight color can be controlled from the outside by changing the light output ratio of the three RGB LEDs.
(B) Since the light redirecting element 20 can be shaped like a Mt. Fuji, the weight can be reduced as compared with the first embodiment. Further, as compared with the second embodiment, it is not necessary to use the fixture 14, and it is not necessary to align the light direction changing element 20 and the light source, so that the surface light emitting device 1 can be easily assembled.
(C) Since the light direction changing element 20 can have a space between the RGB three-color LEDs 16, 17, and 18, a state in which an external force is applied to the LEDs 16 to 18 can be prevented. .

[Fourth Embodiment]
FIG. 5 shows a planar light emitting device according to the fourth embodiment of the present invention. In the third embodiment, in place of the light direction changing element 20 in the third embodiment shown in FIG. 4, a light direction changing element 30 having a paraboloid (B surface) on the upper surface (outer surface) is used. The light direction changing element 30 is fixed to the substrate 10 by the light shielding member 31, and the other configuration is the same as that of the first embodiment.

  The light redirecting element 30 has a rotating paraboloid surface (B surface) with a plating film 15 to be a reflecting surface for incident light, and an outer peripheral surface (C surface) is a light emitting surface for reflected light.

  The light direction conversion element 30 is provided with a through hole 30a into which the shaft portion 31a of the light shielding member 31 is fitted at the center, and a concave portion that accommodates each of the RGB LEDs 16, 17, 18 on the lower surface around the hole 30a. 30b is provided. The light redirecting element 30 is made of a transparent material, and can be made of resin such as acrylic resin, polycarbonate, epoxy resin, silicone, or glass. In addition, arrangement | positioning of LED16-18 is the same as that of (b) of FIG.

  The recess 30b has a depth such that the lower surface thereof does not contact the upper surfaces of the LEDs 16, 17, and 18. The recess 30b may be provided for each of the LEDs 16 to 18 or may be configured by one ring-shaped groove.

  In the present embodiment, instead of the red LED 16, the green LED 17, and the blue LED 18, a configuration in which three or four or more single-color LEDs of the LED 11 having the configuration shown in FIG. it can.

  The light shielding member 31 is made by processing a metal, resin, or the like so as to form a T-shaped cross section, and the diameter thereof is made equal to the diameter of the light redirecting element 30. The lower portion of the shaft portion 31a is threaded and is screwed into the screw hole 10a.

  Next, the operation of the planar light emitting device 1 in the present embodiment will be described. The LEDs 16 to 18 emit light when a driving current is passed, and the three colors of light from the LEDs 16 to 18 enter the light direction changing element 30 from the A surface of the light direction changing element 30, and each light is a light direction changing element. In the process of reflecting in the C-plane direction on the surface of the plating film 15 and emitting to the outside, the other two colors are mixed to become white light. The white light is emitted out of the light direction changing element 30 through the C surface of the light direction changing element 30.

  On the other hand, when light arrives at the planar light emitting device 1 from another planar light emitting device or the like, the light is reflected by the upper surface of the light shielding member 31 and does not enter the planar light emitting device 1.

(Effect of the fourth embodiment)
According to the fourth embodiment, the following effects are obtained.
(B) When the light from the RGB LEDs 16 to 18 enters the light direction changing element 30 from the A surface through the space, the incident angle is narrowed by refraction at the A surface, so that oblique light is emitted directly from each LED. And can guide light farther away.
(B) Since the portion other than the concave portion 30a of the light direction changing element 30 is in contact with the substrate 10 and the upper edge of the light direction changing element 30 is held by the light shielding member 31, the vertical fluctuation of the peripheral edge of the B surface is prevented. Thus, the reflected light can be obtained stably.
(C) Since the three LEDs 16 to 18 serve as light sources, the planar light-emitting device 1 can be increased in power.
(D) Since the light shielding member 31 is provided, light from the outside is blocked and is not taken into the planar light emitting device 1, so that variations in surface illuminance can be suppressed.

[Fifth Embodiment]
6A and 6B show a planar light emitting device according to a fifth embodiment of the present invention, in which FIG. 6A is a plan view and FIG. 6B is a cross-sectional view taken along line DD in FIG.

  This planar light emitting device 1 has a substrate 10, a columnar pedestal 40 provided at a predetermined position on the substrate 10, and first and second reflecting surfaces (D surface, B surface) on the opposing surface. And a light-direction changing element 43 including first and second reflectors 41 and 42 disposed above and below, and a transparent and cylindrical fixture 44 that fixes the second reflector 42 to the substrate 10. Configured.

  The interval between the second reflector 42 and the first reflector 41 is set such that a plurality of reflections are formed between the second reflector 42 and the first reflector 41.

  The LED 11 is connected to a wiring pattern on the substrate 10 via the first reflector 41 and the pedestal 40 when the pedestal 40 and the first reflector 41 are made of an insulating material. Further, when the base 40 and the first reflector 41 are conductive materials such as metal, they are connected to a wiring pattern on the substrate 10 or an external circuit through lead wires or the like.

  The first reflector 41 is made of a material such as metal, resin, etc. so as to form a convex cone and a thin plate as a whole, and the top surface is processed into a flat surface 41a large enough to mount the LED 11. ing. The convex cone is provided with, for example, an inclined surface (D surface) of 45 °, and the D surface is subjected to plating or the like in order to increase the reflectance.

  The second reflector 42 is made of a material such as metal, resin, etc., and is formed in a thin plate shape and has a paraboloid (B surface) on the lower surface, and the outer diameter thereof is the first reflection. The size is set to be the same as or slightly larger than that of the body 41, and the angle of the peripheral portion is set to the angle of the first reflector 41 (about 45 °). Furthermore, the paraboloid (B surface) of the second reflector 42 is subjected to a plating process or the like in order to increase the reflectance.

  The fixture 44 is made of a cylindrical transparent resin or transparent glass, and is fixed to the second reflector 42 and the substrate 10 with an adhesive.

  Next, the operation of the planar light emitting device 1 in the present embodiment will be described. The LED 11 emits light when a driving current is passed, whereby yellow light and blue light from the sealing resin 113 and the phosphor 112 shown in FIG. 2 are emitted toward the second reflector 42, and blue light is emitted. And yellow light are mixed in the process of traveling through space to become white light.

  This white light is reflected by the paraboloid (B surface) of the second reflector 42 and is emitted toward the D surface of the first reflector 41. Light incident on the D surface of the first reflector 41 from the B surface of the second reflector 42 is reflected and fixed in a direction substantially perpendicular to the optical axis of the LED 11, that is, in a horizontal direction of 360 degrees. The light is emitted to the outside through the tool 44.

(Effect of 5th Embodiment)
According to the fifth embodiment, the following effects are obtained.
(A) Since the light from the LED 11 is reflected between the first and second reflectors 41 and 42 a plurality of times and emitted to the outside, the light is efficiently emitted from the planar light emitting device 1 and condensed. Can be made.
(B) Since the inclination of the first and second reflectors 41 and 42 is set to about 45 °, side light emission with an increased horizontal component is possible.
(C) Since the space between the LED 11 and the second reflector 42 is a space, even if the second reflector 42 is deformed by receiving an external force, the external force can be prevented from being transmitted to the LED 11.

[Sixth Embodiment]
FIG. 7 shows a backlight device according to a sixth embodiment of the present invention. In FIG. 7, the width direction of the backlight device 100 is the x direction, the length direction is the y direction, and the height direction is the z direction.

(Configuration of backlight device)
The backlight device 100 is used, for example, for a backlight of a liquid crystal display device, and includes a housing 2 that houses the plurality of planar light emitting devices 1 described in the first to fifth embodiments, and a housing. A light reflecting portion 3 provided on the inner wall surface of the body 2 for reflecting light from the plurality of planar light emitting devices 1, a mounting substrate 4 on which the plurality of planar light emitting devices 1 are mounted, and a plurality of mounting substrates 4 are mounted. And a diffusion transmission part 6 that is provided on the light extraction side of the housing 2 and reflects and diffuses part of the light from the plurality of planar light emitting devices 1 and transmits light.

  Here, the planar light emitting device 1 of the first embodiment shown in FIGS. 1 and 2 is used as the planar light emitting device 1.

  The housing 2 is a resin housing formed by injection molding a resin material such as polycarbonate, and a support portion for supporting the mounting substrate 4 is provided therein. In addition, it is not limited to a resin housing | casing, A metal housing | casing, such as aluminum, may be sufficient.

  The light reflecting portion 3 has a light reflecting surface 3A formed in a mirror shape by sticking sheet-like aluminum as a material for enhancing the reflectivity of light from the surface light emitting device 1. In addition, the light reflection part 3 may be formed by methods other than sheet sticking, for example, may be formed by electroless plating or white coating. Further, the light reflecting surface 3A may have a surface state that reflects at least light, other than a mirror surface.

  The mounting substrate 4 is made of, for example, a glass epoxy substrate, and has a wiring pattern (not shown) electrically connected to the electrode terminal portion exposed on the bottom surface of the planar light emitting device 1 on the surface, and a plurality of wiring patterns (not shown) on the surface. The planar light emitting device 1 is mounted at a predetermined interval.

  The support plate 5 is mounted with a mounting substrate 4 on which a plurality of planar light emitting devices 1 are mounted at a predetermined interval so that the intervals in the x and y directions of adjacent planar light emitting devices 1 are constant. Set to In the present embodiment, the planar light emitting device 1 is mounted such that the distance between the x direction and the y direction is, for example, 50 mm. Further, the surface of the support plate 5 and the surface of the mounting substrate 4 are painted white to enhance the reflectivity of light emitted from the planar light emitting device 1.

  The diffuse transmission part 6 is formed in, for example, a milky white thin plate in which light diffusing particles are mixed in a resin material, and has a predetermined distance from the light emitting surface of the planar light emitting device 1 in the optical axis direction, that is, in the z direction. The light emitted from the plurality of planar light emitting devices 1 is mixed by transmitting a part of the light, reflecting a part of the light, and reflecting the light within the housing 2.

(Operation of backlight device)
Next, the operation of the backlight device 100 will be described. First, light is emitted by energizing the LED 11 of each planar light emitting device 1 from a power source (not shown). The light emitted from each planar light emitting device 1 is emitted obliquely backward, obliquely forward, laterally, and partly forward (z direction).

  In this way, in the space in the housing 2, light is mixed in a complicated manner, so that light having an intensity corresponding to the degree of mixing is uniformly radiated from the diffuse transmission part 6 serving as a light emitting surface. At this time, the light source image of each planar light emitting device 1 is at a level where it cannot be visually recognized.

(Effect of 5th Embodiment)
According to the fifth embodiment, since light from a plurality of planar light emitting devices 1 is mixed to emit light in a planar manner, the amount of emitted light varies as a single characteristic of the planar light emitting device 1. The surface light-emitting device 1 is obtained in which the color variation is averaged and the light emission unevenness and the color unevenness are small without increasing the number of light sources with respect to the light emission area. Therefore, even if there is a planar light emitting device 1 that is extinguished due to a failure or the like, the light is supplemented by the other planar light emitting devices 1 that are lit, thereby reducing illuminance reduction and suppressing uneven light emission. be able to.

  Also, a thin and large surface light source with high brightness and color uniformity can be realized, the number of LEDs used can be reduced, an inexpensive surface light source can be realized, and it is highly efficient, light guide plate free and light. Thus, a planar light source with a high degree of design freedom of dimensions can be obtained.

  In addition, by obtaining a thin, large-screen, uniform surface light source, it is possible to reduce the thickness of a liquid crystal television using an LED backlight, add a backlight to a wall-hanging poster, etc. The surface light source can be installed, and the degree of freedom in lighting design can be improved.

[Other embodiments]
The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the scope of the invention. For example, the combination of the components between the embodiments can be arbitrarily performed.

  For example, in each of the above-described embodiments, a rotating paraboloid is used as a surface that reflects incident light in the 360 ° direction, but a surface made of a quadratic curve such as a spheroidal surface may be used.

The planar light-emitting device which concerns on the 1st Embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing of the AA line of (a). It is sectional drawing which shows the detailed structure of LED of FIG. The planar light-emitting device concerning the 2nd Embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing of the BB line of (a). The planar light-emitting device which concerns on the 3rd Embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing of CC line of (a). It is sectional drawing which shows the planar light-emitting device concerning the 4th Embodiment of this invention. The planar light-emitting device concerning the 5th Embodiment of this invention is shown, (a) is a top view, (b) is sectional drawing of the DD line | wire of (a). It is a perspective view which shows the backlight apparatus which concerns on the 6th Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Planar light-emitting device 2 Housing | casing 3 Light reflection part 3A Light reflection surface 4 Mounting board 5 Support plate 6 Diffusion transmission part 9 Light emission light source unit 10 Board | substrate 10a Screw hole 11 LED
12, 13 Light direction changing element 12a Revolving paraboloid 12b Recessed part 14 Fixing tool 15 Plating film 16 Red LED
17 Green LED
18 Blue LED
19 Screw 20 Light direction changing element 30 Light direction changing element 30a Through hole 30b Recess 31 Light shielding member 31a Shaft part 40 Base 41 First reflector 41a Flat surface 42 Second reflector 43 Light direction changing element 44 Fixing tool 100 Back Light device 110 Package 110a Recess 111 Blue LED element 112 Phosphor 113 Sealing resin 114A, 114B Lead

Claims (3)

A columnar body having translucency ;
Provided on one surface of the front Symbol pillar-shaped body, an incident surface on which light is incident,
A central reflecting surface that is provided at the center of the other surface of the columnar body and reflects incident light from the incident surface in a side surface direction of the columnar body ;
An inclined reflecting surface for reflecting or transmitting the light reflected from said central reflecting surface with provided on the periphery of the central reflecting surface,
Light redirecting elements, characterized in that said provided on one surface of the pillar-shaped body and a said central reflecting surface and the plane reflecting surface for reflecting light reflected from the inclined reflecting surfaces except the entrance surface. Further comprising a recess provided on the one surface of the columnar body to accommodate the light source without contacting the light source;
The light direction changing element according to claim 1, wherein the bottom surface of the concave portion is the incident surface on which the light from the light source is incident. A substrate,
A light source provided on the substrate;
The planar light-emitting device provided with the light direction change element of Claim 1 or 2 which provided the clearance gap between the said light source and the said entrance plane, and was fixed on the said board | substrate.

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