JP5228807B2 - Light emitting method of light emitting diode - Google Patents

Description

The present invention incorporates a small light-emitting diode (hereinafter referred to as “light-emitting portion”) that reflects light in a two-dimensional direction at least substantially perpendicular to the light-emitting axis of the light-emitting element by a reflecting surface facing the light-emitting surface of the light-emitting element. The present invention relates to a light emitting method for a light emitting diode .

In the present specification, the LED chip itself is referred to as a “light emitting element”, and the whole including the optical device such as a package resin or a lens system on which the LED chip is mounted is referred to as a “light emitting diode” or “LED”. To do.

When an LED is used as a monochromatic light source, there is no filter loss unlike an incandescent light bulb, and although there is heat generation, there is no place where the temperature is high, and the LED can be thinned. However, the conventional Fresnel lens combined type lamp has the following problems.

A conventional Fresnel lens combined lamp will be described with reference to FIG. FIG. 8 is a cross-sectional view illustrating the structure of a conventional lamp using a Fresnel lens. The lamp 40 includes a convex lens-shaped LED 41, a Fresnel lens 42, and a front cover lens 43. Then, the light emitted from the LED 41 is condensed to some extent by the convex lens-shaped radiation surface, reaches the Fresnel lens 42, is distributed by the Fresnel lens 42, and is emitted forward as parallel light, and is externally emitted from the front cover lens 43. Is done.

However, due to the restriction of the distance between the Fresnel lens 42 and the light source, the lamp 40 becomes thick as shown in the figure, and light that cannot be controlled in the lateral direction is emitted, so that the light utilization efficiency is low. Therefore, by using a lamp composed of a two-dimensional direction emission LED, a reflection member that reflects the two-dimensional direction emission light installed around the LED, and a front cover lens, it is thin and has high light use efficiency. It can be a lamp.

However, when the two-dimensional direction emission LED is made small, the solid angle with respect to the light emitting element is reduced, and the radiation efficiency is lowered. In addition, if the LED is made large, the LED is formed in a plurality of lines on the lead frame, but since the interval is about the package diameter, the number of products is reduced and the light emitting element sealing resin curing time generally takes 1 hour or more. Inferior to sex. Further, since the internal stress of the light emitting element sealing resin is increased, stress damage to the light emitting element and cracking of the package are likely to occur, resulting in poor reliability.

Accordingly, an object of the present invention is to provide a light emission method for a two-dimensional direction emission type light emitting diode having high radiation efficiency, excellent mass productivity, and high reliability.

The light emitting method for a light emitting diode according to the first aspect of the invention is such that a light emitting portion set in a sealing mold and sealed with a light transmissive material is emitted from a light emitting element embedded with the light transmissive material. The center of the light-emitting surface of the light-emitting element that reflects the light in a two-dimensional plane direction that is substantially perpendicular to the vertical axis (Z-axis) passing through the center of the light-emitting surface of the light-emitting element is substantially focused, and the X-axis direction Having a two-dimensional direction reflecting surface shaped like an umbrella obtained by rotating a part of a parabola with the axis of symmetry around the vertical axis (Z-axis), and outside of the light emitting part around the two-dimensional direction Of the light emitted from the light emitting unit by the reflector unit having a reflecting surface that is optically coupled and extends the reflecting surface in the two-dimensional direction. The light that reaches the opposite surface is also emitted from the light emitting element. Vertical axis passing through the center (Z axis) and is intended to reflect the substantially vertical two-dimensional directions.

As described above, the light emitting method of the light emitting diode includes a light emitting unit having a two-dimensional direction reflecting surface and a reflector unit optically coupled to the periphery of the light emitting unit, and the reflector unit has a two-dimensional direction reflecting surface. It has an extended reflecting surface. Therefore, this LED is equivalent to the two-dimensional direction emission LED of the size of the reflector portion, and can form a large solid angle with respect to the light emitting element, so that it becomes a light emission method of the light emitting diode with high radiation efficiency.

In addition, since the light emitting portion is formed in a plurality of lines on the lead frame, it can be reduced in size. Therefore, the same solid angle is formed with the light emitting element sealing resin, whereas the interval is increased by the package diameter. Can do. And since light emitting element sealing resin hardening time is generally 1 hour or more, it becomes LED excellent in mass-productivity. Furthermore, since the same solid angle is formed with the light emitting element sealing resin, the internal stress of the LED sealing resin can be kept small, so that the stress damage to the light emitting element and the crack of the package do not occur. It can be expensive.

Further, the reflector portion is formed to be thin, and reflects light in a two-dimensional direction from the light emitted from the light emitting portion to the surface facing the reflecting surface.
As a result, in addition to the light reflected by the reflecting surface and reflected in the two-dimensional direction, the light from the light emitting part is also totally reflected and radiated in the two-dimensional direction on the surface facing the reflecting surface. It becomes LED with high efficiency.

In this manner, a two-dimensional direction emission type light emitting diode having higher radiation efficiency, excellent mass productivity, and high reliability is obtained.

According to a second aspect of the present invention, there is provided a light emitting method for emitting light of a light emitting diode , wherein a light emitting part set in a sealing mold and sealed with a light transmissive material is emitted from a light emitting element embedded with the light transmissive material. The center of the light-emitting surface of the light-emitting element that reflects the light in a two-dimensional plane direction that is substantially perpendicular to the vertical axis (Z-axis) passing through the center of the light-emitting surface of the light-emitting element is substantially focused, and the X-axis direction Having a two-dimensional direction reflecting surface shaped like an umbrella obtained by rotating a part of a parabola with the axis of symmetry around the vertical axis (Z-axis), and outside of the light emitting part around the two-dimensional direction The reflector portion is mounted with an interface and is optically coupled and has a reflecting surface formed by extending the reflecting surface in the two-dimensional direction so as to face the reflecting surface and reflect the reflecting surface in the two-dimensional direction and the reflecting surface. The light reflected by the surface in the two-dimensional direction It is intended to reflect the stepped reflecting surface for reflecting the substantially vertical dimensional direction substantially perpendicular to the vertical axis (Z-axis) passing through the center of the light emitting surface of the optical element.

As described above, the light emitting method of the light emitting diode includes a light emitting unit having a two-dimensional direction reflecting surface and a reflector unit optically coupled to the periphery of the light emitting unit, and the reflector unit has a two-dimensional direction reflecting surface. It has an extended reflecting surface. Therefore, this LED is equivalent to the two-dimensional direction emission LED having the size of the reflector portion, and can form a large solid angle with respect to the light emitting element, so that the LED has high emission efficiency.

In addition, since the light emitting portion is formed in a plurality of lines on the lead frame, it can be reduced in size. Therefore, the same solid angle is formed with the light emitting element sealing resin, whereas the interval is increased by the package diameter. Can do. And since light emitting element sealing resin hardening time is generally 1 hour or more, it becomes LED excellent in mass-productivity. Furthermore, since the same solid angle is formed with the light emitting element sealing resin, the internal stress of the light emitting element sealing resin can be kept small, so that the stress damage to the light emitting element and the crack of the package do not occur. Can be high.

The reflector unit has a stepped reflecting surface that faces the reflecting surface and reflects the light reflected in the two-dimensional direction by the reflecting surface and the reflecting surface in a direction substantially perpendicular to the two-dimensional direction. Is.
As a result, even without providing a reflecting member around the light emitting diode, the reflector serves as a reflecting member and reflects light in a direction substantially perpendicular to the two-dimensional direction. Therefore, it is a light emitting method of a light emitting diode that can be used as a small and highly efficient lamp.

In this manner, the light-emitting diode can be used as a small and highly radiant lamp, has excellent mass productivity, and has high reliability.

According to a third aspect of the present invention, there is provided the light emitting method for emitting light of a light emitting diode according to the first or second aspect, wherein the two-dimensional reflection surface of the light emitting section is focused on the light emitting element or the periphery of the light emitting element, and is elliptical or parabolic. , A hyperbola, or a part of any of these approximate curves is rotated around a vertical axis passing through the center of the light emitting surface of the light emitting element.

As a result, of the light emitted from the light emitting element, the light within a predetermined range reaches the optical surface as the two-dimensional direction reflecting surface, and all of these lights are all incident because the incident angle to the optical surface is larger than the critical angle. Reflected toward the side. Here, the optical surface is focused on the light emitting element or the periphery of the light emitting element, and an ellipse, a parabola, a hyperbola, or a part of any of these approximate curves is rotated around a vertical axis passing through the center of the light emitting surface of the light emitting element. Due to the shape, all the light reflected by the optical surface travels parallel to the horizontal plane and is emitted in a two-dimensional direction. And since the upper surface of a reflector part has the shape which followed this optical surface, all the light reflected on the upper surface of a reflector part advances in parallel with a horizontal surface, and is radiated | emitted in a two-dimensional direction.

In this way, a light emitting diode having high radiation efficiency in a two-dimensional direction, excellent mass productivity, and high reliability is obtained.

As described above, the light emitting method for a light emitting diode according to the first aspect of the present invention is a two-dimensional method of reflecting light emitted from a light emitting element embedded with a light transmissive material in at least a two-dimensional plane direction. A light emitting unit having a direction reflecting surface, and a reflector unit having a reflecting surface that is optically coupled and extends the two-dimensional direction reflecting surface around at least the two-dimensional direction of the light emitting unit. is there.

As described above, the light emitting method of the light emitting diode includes a light emitting unit having a two-dimensional direction reflecting surface and a reflector unit optically coupled to the periphery of the light emitting unit, and the reflector unit has a two-dimensional direction reflecting surface. It has an extended reflecting surface. Therefore, this LED is equivalent to the two-dimensional direction emission LED of the size of the reflector portion, and can form a large solid angle with respect to the light emitting element, so that it becomes a light emission method of the light emitting diode with high radiation efficiency.

In addition, since the light emitting portion is formed in a plurality of lines on the lead frame, it can be reduced in size. Therefore, the same solid angle is formed with the light emitting element sealing resin, whereas the interval is increased by the package diameter. Can do. And since light emitting element sealing resin hardening time is generally 1 hour or more, it becomes LED excellent in mass-productivity. Furthermore, since the same solid angle is formed with the light emitting element sealing resin, the internal stress of the light emitting element sealing resin can be kept small, so that the stress damage to the light emitting element and the crack of the package do not occur. Can be high.

The reflector portion is formed with a small thickness, and the light reaching the surface facing the reflection surface out of the light emitted from the light emitting portion is also reflected in the two-dimensional direction.
As a result, in addition to the light reflected by the reflecting surface and reflected in the two-dimensional direction, the light from the light emitting part is also totally reflected and radiated in the two-dimensional direction on the surface facing the reflecting surface. It becomes LED with high efficiency.

In this manner, a two-dimensional direction emission type light emitting diode having higher radiation efficiency, excellent mass productivity, and high reliability is obtained.

According to a second aspect of the present invention, there is provided a light emitting method for a light emitting diode, comprising: a light emitting element having a two-dimensional direction reflecting surface that reflects light emitted from a light emitting element embedded with a light transmissive material in at least a two-dimensional plane direction. And a reflector having a reflection surface that is optically coupled and extends the reflection surface in the two-dimensional direction at least around the light-emitting portion in the two-dimensional direction.

As described above, the light emitting method of the light emitting diode includes a light emitting unit having a two-dimensional direction reflecting surface and a reflector unit optically coupled to the periphery of the light emitting unit, and the reflector unit has a two-dimensional direction reflecting surface. It has an extended reflecting surface. Therefore, this LED is equivalent to the two-dimensional direction emission LED of the size of the reflector portion, and can form a large solid angle with respect to the light emitting element, so that it becomes a light emission method of the light emitting diode with high radiation efficiency.

In addition, since the light emitting portion is formed in a plurality of lines on the lead frame, it can be reduced in size. Therefore, the same solid angle is formed with the light emitting element sealing resin, whereas the interval is increased by the package diameter. Can do. And since light emitting element sealing resin hardening time is generally 1 hour or more, it becomes LED excellent in mass-productivity. Furthermore, since the same solid angle is formed with the light emitting element sealing resin, the internal stress of the light emitting element sealing resin can be kept small, so that the stress damage to the light emitting element and the crack of the package do not occur. Can be high.
The reflector unit has a stepped reflecting surface that faces the reflecting surface and reflects the light reflected in the two-dimensional direction by the reflecting surface and the reflecting surface in a direction substantially perpendicular to the two-dimensional direction. Is.

As a result, even without providing a reflecting member around the light emitting diode, the reflector serves as a reflecting member and reflects light in a direction substantially perpendicular to the two-dimensional direction. Therefore, it becomes a light emitting diode that can be used as a lamp having a small size and high radiation efficiency.

In this manner, the light-emitting diode can be used as a small and highly radiant lamp, has excellent mass productivity, and has high reliability.

According to a third aspect of the present invention, there is provided the light emitting method for emitting light of a light emitting diode according to the first or second aspect, wherein the two-dimensional reflection surface of the light emitting section is focused on the light emitting element or the periphery of the light emitting element, and is elliptical or parabolic. , A hyperbola, or a part of any of these approximate curves is rotated around a vertical axis passing through the center of the light emitting surface of the light emitting element.

As a result, of the light emitted from the light emitting element, the light within a predetermined range reaches the optical surface as the two-dimensional direction reflecting surface, and all of these lights are all incident because the incident angle to the optical surface is larger than the critical angle. Reflected toward the side. Here, the optical surface is focused on the light emitting element or the periphery of the light emitting element, and an ellipse, a parabola, a hyperbola, or a part of any of these approximate curves is rotated around a vertical axis passing through the center of the light emitting surface of the light emitting element. Due to the shape, all the light reflected by the optical surface travels parallel to the horizontal plane and is emitted in a two-dimensional direction. And since the upper surface of a reflector part has the shape which followed this optical surface, all the light reflected on the upper surface of a reflector part advances in parallel with a horizontal surface, and is radiated | emitted in a two-dimensional direction.

In this way, a light emitting diode having high radiation efficiency in a two-dimensional direction, excellent mass productivity, and high reliability is obtained.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1
First, a first embodiment of the light emitting method for emitting light of a light emitting diode according to the present invention will be described with reference to FIGS. FIG. 1A is a plan view showing an entire configuration of a light emitting method for a light emitting diode according to a first embodiment of the present invention, and FIG. 1B is a longitudinal sectional view thereof. FIG. 2 is an explanatory diagram showing characteristics as a two-dimensional direction emission light source of the light emission method of the light emitting diode according to the first embodiment of the present invention. FIG. 3 is a longitudinal sectional view showing a configuration of a lamp using the light emitting method for light emitting diodes according to the first embodiment of the present invention.

First, the structure of the LED 2 of the first embodiment will be described with reference to FIG. As shown in FIG. 1, the LED 2 is formed by attaching a reflector portion 4 to a light emitting portion 3. The light emitting unit 3 mounts the light emitting element 8 on the lead 5a of the pair of standing leads 5a and 5b, and the light emitting element 8 and the lead 5b are electrically connected by a wire (not shown). The tips of the leads 5a and 5b, the light emitting element 8, and the wires are set in a resin sealing mold and sealed with a transparent epoxy resin in a cross-sectional shape as shown in the drawing.

Here, a minute flat surface is formed at the central portion of the upper surface 3 a of the light emitting unit 3. Following this center point, a part of a parabola with the center of the light emitting surface of the light emitting element 8 as a focal point as a reflecting surface 3a serving as a two-dimensional radiating surface and having an X axis direction as a symmetric axis is rotated around the Z axis. It is shaped like an umbrella. Further, the side surface of the light emitting unit 3 forms a part of a spherical surface centering on the light emitting element 8. The light emitted upward from the light emitting element 8 is reflected in the substantially horizontal direction by the reflecting surface 3a and is emitted in a two-dimensional direction of 360 degrees. The light emitted from the light emitting element 8 to the side is emitted in a two-dimensional direction from the side surface forming a part of the spherical surface.

Such a small-diameter two-dimensionally radiating light emitting section 3 is excellent in mass productivity and high in reliability, but is optically disadvantageous. Therefore, a ring-shaped reflector 4 is attached to the outside of the light emitting unit 3. The reflector unit 4 is formed of an acrylic resin having a refractive index equivalent to that of the light emitting unit 3 and is physically and optically bonded by an optical bonding agent. Note that physical bonding is not always necessary. Further, since the gap between the light emitting unit 3 and the reflector unit 4 is slight and the interfaces are substantially parallel, the optical loss is small without using an optical bonding agent, and the optical bonding agent is not necessarily used. .

In addition, since the light emitting part 3 seals the light emitting element 8 and forms the reflecting surface 3a, the reflecting surface 3a can be close to the light emitting element 8, and the wire height is about 0.3 mm. Is also possible. By being close to each other, a large solid angle can be obtained geometrically, which is optically more advantageous than the case where the reflecting surface 3a is formed by other members.

The upper surface 4a of the reflector unit 4 is a curved surface that is continuous with the upper surface 3a of the light emitting unit 3, and the light emitted from the light emitting element 8 and reflected by the upper surface 4a of the reflector unit 4 is approximately 360 degrees in a two-dimensional direction. To be emitted. Here, the outer diameter of the light emitting part 3 is φ5, and the outer diameter of the reflector part 4 is φ20. The optical advantage by attaching the reflector part 4 is demonstrated with reference to FIG. As shown in FIG. 2, in the case of only the light emitting unit 3, only light within an angle θ 1 from the perpendicular passing through the center of the light emitting element 8 is radiated in a two-dimensional direction. To the light within the angle θ2 is emitted in the two-dimensional direction, so that the light emitted within the angle θ1 to θ2 can also be effectively emitted in the two-dimensional direction.

In FIG. 2, the cross-sectional two-dimensional display is used, but since the light is actually within a solid angle in the range of θ1 to θ2, a remarkable effect can be obtained.

A lamp using the light emitting diode 2 of the first embodiment will be described with reference to FIG. As shown in FIG. 3, the lamp 1 using the LED 2 of the first embodiment has the LED 2 as a two-dimensional radiating light source including a light emitting element at the center, and a reflecting member installed around the LED 2. An inclined portion 6a of approximately 45 degrees out of the six stepped surfaces is a reflecting surface. And the front cover lens 7 which covers these is provided. When power is supplied to the lead 5 of the LED 2, the light of the light emitting element is emitted in a two-dimensional direction of 360 degrees from the side surface of the reflector unit 4 attached around the light emitting unit 3 of the LED 2. 6 is reflected in a substantially vertical direction by the reflecting surface 6 a and is emitted from the front cover lens 7 to the outside.

In addition, a two-dimensional direction means here the direction to the reflective surface 6a of the reflection member 6 installed in the periphery with respect to LED2. Strictly, it is not limited to the planar direction perpendicular to the Z-axis from the LED 2, but it is sufficient that the light from the LED 2 is efficiently irradiated to the reflection surface installed around the LED 2.

As described above, the lamp 1 using the light emitting diode 2 according to the first embodiment is extremely thin, most of the light emitted from the LED 2 is effectively used, and is externally radiated from the front cover lens 7 very efficiently. .

Embodiment 2
Next, a second embodiment of the light emitting method for emitting light of a light emitting diode according to the present invention will be described with reference to FIG. FIG. 4 is a longitudinal sectional view showing the entire configuration of the light emitting diode according to the second embodiment of the present invention.

As shown in FIG. 4, in the LED 12 of the second embodiment, the structure of the light emitting unit 3 is the same as that of the first embodiment. However, the bottom surface 14b of the reflector part 14 rises to near the mounting surface of the light emitting element 8, and the reflector part 14 is thinned. As a result, not only the light emitted upward from the light emitting element 8 but also the incident angle of the light emitted downward from the side surface of the light emitting element 8 with respect to the bottom surface 14b of the reflector portion 14 increases and exceeds the critical angle. The light is totally reflected by the bottom surface 14 b of the portion 14 and is radiated in a two-dimensional direction from the side surface of the reflector portion 14.

Further, since the light emitting element 8 has a size, there is also light that is reflected by the upper surface 14a of the reflector portion 14 and is reflected downward without being emitted in the horizontal direction as shown in the figure. The light is totally reflected by the bottom surface 14 b of the portion 14 and is radiated in a two-dimensional direction from the side surface of the reflector portion 14.

As a result, the amount of light emitted from the LED 12 in the two-dimensional direction increases, and the two-dimensional direction-emitting LED with better radiation efficiency is obtained.

Embodiment 3
Next, a third embodiment of the light emitting method of the light emitting diode according to the present invention will be described with reference to FIG. FIG. 5 is a longitudinal sectional view showing the overall configuration of a light emitting method for a light emitting diode according to a third embodiment of the present invention.

As shown in FIG. 5, in the LED 21 of the third embodiment, the structure of the light emitting unit 3 is the same as that of the first embodiment. However, the bottom surface of the reflector portion 24 is formed in a stepped shape and the slope portion is the reflecting surface 24b, and the light reflected in the two-dimensional direction from the upper surfaces 3a and 24a is reflected upward by the reflecting surface 24b. The light reflected upward is radiated to the outside from the upper surface 24a of the reflector section 24. At this time, since refraction occurs at the upper surface 24a, the direction of reflection by the reflecting surface 24b is changed so that the refracted light is radiated to the outside substantially vertically. Control. If the angle of the reflecting surface 24b with respect to the two-dimensional emitted light is such that it is not totally reflected, the reflecting surface 24b must be subjected to a mirror treatment such as metal deposition from the outside to ensure a high reflectivity.

In this way, by forming the reflection surface 24b that reflects the two-dimensional radiation light in the substantially vertical direction on the bottom surface of the reflector portion 24, the light emitting diode 21 that serves as a small lamp is obtained.

Embodiment 4
Next, Embodiment 4 of the light emission method of the light emitting diode of the present invention will be described with reference to FIG. FIG. 6A is a plan view showing an entire configuration of a light emitting method for a light emitting diode according to a fourth embodiment of the present invention, and FIG. 6B is a longitudinal sectional view thereof.

As shown in FIG. 6, in the LED 31 of the fourth embodiment, the structure of the light emitting unit 3 is the same as that of the first embodiment. However, the outer shape of the reflector portion 34 is circular in each of the above embodiments, but in the fourth embodiment, it is oval. Further, the bottom surface of the reflector portion 34 is formed in a stepped shape as in the third embodiment, and the slope portion is a reflecting surface 34b, and the light reflected in the two-dimensional direction from the upper surfaces 3a and 34a is reflected on the reflecting surface. Reflects upward at 34b. The light reflected upward is externally radiated from the upper surface 34a of the reflector section 34. At this time, since refraction occurs at the upper surface 34a, the direction of reflection by the reflective surface 34b is changed so that the refracted light is externally radiated substantially vertically. Control. If the angle of the reflecting surface 34b with respect to the two-dimensional emitted light is such that it is not totally reflected, the reflecting surface 34b needs to be subjected to mirror processing such as metal vapor deposition from the outside to ensure high reflectivity.

Furthermore, as shown in FIG. 6A, the bottom surface of the reflector portion 34 is divided into eight segments, and the reflecting surfaces 34b of adjacent segments are formed alternately. And by giving each reflective surface 34b curvature according to the irradiation density from the light emission part 3, the brightness | luminance of the light emitting diode 31 whole can be made uniform. As a result, when viewed from above, the light emitting diode 31 can be a light emitting diode having a natural image in which the entire luminance of the light emitting diode 31 is uniform and shines. Further, even when the light emitting diode 31 is extinguished, the external light is reflected and the whole is uniformly shining and becomes a very nice light emitting diode.

Embodiment 5
Next, a fifth embodiment of the light emitting method for emitting light of the light emitting diode according to the present invention will be described with reference to FIG. FIG. 7: is a longitudinal cross-sectional view which shows the whole structure of the light emission method of the light emitting diode concerning Embodiment 5 of this invention.

As shown in FIG. 7, the LED 51 according to the fifth embodiment includes a light source unit 53 and a reflection unit 54 unlike the above embodiments. That is, the light source unit 53 mounts the light emitting element 8 on the lead 55a among the pair of standing leads 55a and 55b, and the light emitting element 8 and the lead 55b are electrically connected by a wire (not shown). The tips of these leads 55a and 55b, the light emitting element 8, and the wires are set in a resin sealing mold, and resin-sealed into a shape in which a conical shape and a cylindrical shape as shown in the figure are connected by a transparent epoxy resin. Is done.

Then, the reflecting portion 54 made of an acrylic resin having a refractive index equivalent to that of the transparent epoxy resin and having a concave portion corresponding to the conical portion of the light source portion 53 in the central portion is physically and optically formed by the optical bonding agent in the conical portion. It is joined. Note that physical bonding is not always necessary. In addition, since the gap between the light source unit 53 and the reflection unit 54 is very small and the respective interfaces are substantially parallel, light loss is small without using an optical bonding agent, and it is not always necessary to use an optical bonding agent. .

The upper surface 54a of the reflecting portion 54 is a two-dimensional direction reflecting surface on which light emitted from the light emitting element 8 is reflected in a substantially two-dimensional parallel direction. Therefore, when electric power is supplied to the pair of leads 55a and 55b to cause the light emitting element 8 to emit light, the light reflected by the upper surface 54a upward is reflected approximately 360 degrees in a two-dimensional direction, and the reflecting portion 54 Radiated from the side of the outside.

Thus, even if it is not the combination of the light emission part which has a two-dimensional direction reflective surface which reflects light to a two-dimensional plane direction, and a reflector part, it becomes a light emitting diode which can radiate | emit light with high radiation efficiency to a two-dimensional direction. Note that the reflecting portion 54 is not necessarily limited to one that is coupled only to the conical portion of the light source portion 53, and may be coupled to the cylindrical portion of the light source portion 53 below the reflecting portion 54.

In each of the above embodiments, it is assumed that a red light emitting element is used as the light emitting element, but any color light emitting element may be used. In addition, although a transparent epoxy resin is used as a light transmissive material for sealing the light emitting element and the like in the light emitting portion and the light source portion, other materials such as a transparent silicon resin may be used.

Further, the flat surface at the central portion of the upper surface of the light emitting unit may be a concave surface or a convex surface, or a reflecting surface may be formed from the central portion. The reflecting surface is not limited to a shape in which a part of a parabola with the X axis as a symmetric axis is rotated around the Z axis, but an ellipse, a parabola, a hyperbola, or an approximate curve of these that focuses on the periphery of the light emitting element or light emitting element Even if a part of is rotated around the Z axis, light can be emitted to a predetermined range.

In each of the above embodiments, the outer shape of the reflector portion and the reflecting portion is circular or elliptical, but other shapes may be used. Furthermore, although acrylic resin is used as the material for the reflector part and the reflecting part, any material may be used as long as it has a refractive index equivalent to that of the sealing material for the light emitting part.

The configuration, shape, quantity, material, size, connection relationship, and the like of the other parts of the light emitting diode are not limited to the above embodiments.

FIG. 1A is a plan view showing an entire configuration of a light emitting method for a light emitting diode according to a first embodiment of the present invention, and FIG. 1B is a longitudinal sectional view thereof. FIG. 2 is an explanatory diagram showing characteristics as a two-dimensional direction emission light source of the light emission method of the light emitting diode according to the first embodiment of the present invention. FIG. 3 is a longitudinal sectional view showing a configuration of a lamp using the light emitting method for light emitting diodes according to the first embodiment of the present invention. FIG. 4 is a longitudinal sectional view showing the overall configuration of the light emitting method for a light emitting diode according to the second embodiment of the present invention. FIG. 5 is a longitudinal sectional view showing the overall configuration of a light emitting method for a light emitting diode according to a third embodiment of the present invention. FIG. 6A is a plan view showing an entire configuration of a light emitting method for a light emitting diode according to a fourth embodiment of the present invention, and FIG. 6B is a longitudinal sectional view thereof. FIG. 7: is a longitudinal cross-sectional view which shows the whole structure of the light emission method of the light emitting diode concerning Embodiment 5 of this invention. FIG. 8 is a cross-sectional view showing the structure of a conventional lamp using a Fresnel lens.

2, 12, 21, 31, 51 Light emitting diode 3 Light emitting portion 3a Two-dimensional radiating surface 4, 14, 24, 34 Reflector portions 4a, 14a, 24a, 34a Reflecting surface 8 Light emitting element 14b Surface 24b facing the reflecting surface, 34b Staircase-like reflecting surface 53 Light source part 54 Reflecting part

Claims (3)

The light emitting section set in the sealing mold and sealed with the light transmissive material passes the light emitted from the light emitting element embedded with the light transmissive material through the center of the light emitting surface of the light emitting element. A part of a parabola with the center of the light emitting surface of the light emitting element reflecting light in a two-dimensional plane direction substantially perpendicular to the vertical axis (Z axis) as a substantially focal point and a symmetric axis in the X axis direction is defined as the vertical axis (Z A two-dimensional direction reflecting surface shaped like an umbrella rotated around the axis)
The light emitting unit is provided by a reflector unit which is attached with an interface outside the periphery of the light emitting unit in the two-dimensional direction and is optically coupled and has a reflecting surface extending from the two-dimensional direction reflecting surface. Of the light emitted from the light source, the light reaching the surface facing the reflection surface is also reflected in a two-dimensional direction substantially perpendicular to the vertical axis (Z axis) passing through the center of the light emitting surface of the light emitting element. A light emitting method for emitting light of a light emitting diode. The light emitting section set in the sealing mold and sealed with the light transmissive material passes the light emitted from the light emitting element embedded with the light transmissive material through the center of the light emitting surface of the light emitting element. A part of a parabola with the center of the light emitting surface of the light emitting element reflecting light in a two-dimensional plane direction substantially perpendicular to the vertical axis (Z axis) as a substantially focal point and a symmetric axis in the X axis direction is defined as the vertical axis (Z A two-dimensional direction reflecting surface shaped like an umbrella rotated around the axis)
The reflecting surface is provided by a reflector unit having a reflecting surface that is attached with an interface outside the periphery of the light emitting unit in the two-dimensional direction and is optically coupled and extends the reflecting surface of the two-dimensional direction. The two-dimensional direction reflecting surface and the light reflected in the two-dimensional direction by the reflecting surface are substantially perpendicular to the two-dimensional direction substantially perpendicular to the vertical axis (Z-axis) passing through the center of the light emitting surface of the light emitting element. light emission method of the light-emitting diodes, characterized in that to thus reflecting the stepped reflecting surface which reflects the a direction. The two-dimensional reflective surface that is substantially perpendicular to the vertical axis (Z-axis) passing through the center of the light emitting surface of the light emitting element of the light emitting unit is focused on the light emitting element or the periphery of the light emitting element, and is an ellipse, parabola, hyperbola, or an approximation thereof. 3. The method according to claim 1, wherein any one of the curved lines is formed in a shape rotated around a vertical axis passing through a center of a light emitting surface of the light emitting element. The light emission method of the light emitting diode as described.

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