JP2003218408A - Light emitting diode and led light - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To realize an LED light which is improved in external appearance, taking advantage of the feature of an LED or its thinness, capable of irradiating a large area with a single light emitting element, and high in external radiation efficiency. <P>SOLUTION: Light emitted from an LED 32 as a light emitting element to travel toward the top surface of an LED light is totally reflected from the top surface of the LED light because an angle of incidence is large. The light travels in parallel with an X-Y plane, the lateral side of the LED light serves as a part of a spherical surface where the LED 32 is located at its center, so that the light travels in parallel with the X-Y plane as it is and radiated in all directions of 360° around a Z axis. A stepped reflecting mirror 33 is provided to the LED light, the stepped reflecting mirror 33 is provided with reflecting faces 33a which are sloped by an angle of 45° or so, the light is reflected from the top surface and travels nearly in parallel with an X-Y plane, and the other light emitted direct from the lateral side of the LED 32 also travels nearly in parallel with the X-Y plane, so that the light reflected from the reflecting faces 33a travels nearly perpendicularly and upwards, and radiates outside within an angle of 20° around the Z axis as it passes through a transparent front plate (not shown in Figure) of the LED light. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a light emitting device (hereinafter referred to as
An entire light emitting device (hereinafter, also referred to as "light emitting diode" or "LED") including an optical device such as a package resin or a lens system on which an "LED chip" is mounted,
Also, the present invention relates to an LED light which is applied to a lighting device such as an on-vehicle light, a display device and the like by using a light emitting diode as a light source.

[0002]

2. Description of the Related Art With the increase in brightness of light-emitting elements, LED lights having LEDs as light sources have been increasingly used in automobile backlights and the like. LEDs have a sharp spectrum and good visibility. Further, since the response speed is fast, the signal transmission speed to the following vehicle is fast, and it is recognized that the stationary distance is shortened during high speed running. Furthermore, L
Since the ED itself is a monochromatic light source, it is not necessary to filter out light other than the necessary colors like an incandescent light bulb, and it is highly efficient as a monochromatic light source, leading to energy saving.

An example of such an LED light is shown in FIG. FIG. 25 is a cross-sectional view showing the overall configuration of an example of a conventional LED light. As shown in FIG. 25, this LE
The D light 130 uses a lens type LED 131 in which a light emitting element 132 is sealed in a convex lens shape with a transparent epoxy resin 135 as a light source. In the lens-type LED 131, the light emitting element 132 is mounted on the lead 133a of the pair of leads 133a and 133b, the light emitting element 132 and the lead 133b are bonded by the wire 134, and the whole is made into a convex lens shape with the transparent epoxy resin 135. It is sealed. The lens type LED 131 is surrounded by a paraboloidal reflecting mirror 136, and a Fresnel lens 137 is formed in the upper center part. In the above configuration, the light emitted from the lens-type LED 131 is reflected by the reflecting mirror 136 or condensed by the Fresnel lens 137,
All of them are emitted substantially parallel to each other. Then, the light that has been spread by the interface of the unevenness provided on the lower surface of the resin lens 139 and transmitted through the resin lens 139 is externally radiated as radiated light having a spread of about 20 degrees which is the standard of the vehicle-mounted backlight. .

On the other hand, now that the output of the light emitting element is further improved, it is necessary to cover a light emitting area of a predetermined area with a small number of light emitting elements. This is to reduce the number of components and the labor of component mounting. However, in the above-described LED light 130, when it is attempted to cover a larger area with one light emitting element, the shape becomes similar and large, and the size becomes large in the area direction and thick in the thickness direction. Also, if the film is forcibly thinned, the appearance will be degraded. Therefore, there is a problem that the thin light source, which is a feature of the LED, cannot be used. Further, the Fresnel lens 137 is also provided from the light emitting element 132 to the reflecting mirror 136.
Light that does not reach this level cannot be optically controlled and cannot be externally radiated, so there was still a problem in terms of external radiation efficiency.

As a solution to such a problem, for example, there is an LED light shown in Patent Document 1.

[0006]

[Patent Document 1] Japanese Patent Laid-Open No. 2001-93312 (FIG. 2)

FIG. 26 shows an LED light disclosed in the publication, (a) is a longitudinal sectional view centering on a light source, and (b) is a sectional view.
FIG. 3 is a partial perspective view showing the configuration of an LED light. This L
In the ED light, the light source 150 and a parabola arranged at a position on the central axis facing the light source 150 and reflecting the light emitted from the light source 150 as light in the Y direction substantially orthogonal to the central axis X of the light source 150. A first reflection surface 151 having a reflection surface 151a and light arranged in the periphery of the first reflection surface 151 as a center and reflected by the first reflection surface 151 are converted into light in the central axis X direction. And a second reflecting surface 152 having a plurality of small reflecting surfaces 152a for reflecting. In such a configuration, the light emitted from the light source 150 is reflected in the Y direction by the parabolic reflecting surface 151a of the first reflecting surface 151, and this reflected light is reflected by the small reflecting surface 15 of the second reflecting surface 152.
By being reflected in the central axis X direction by 2a, the vehicular signal light having a predetermined emission angle can be emitted over a predetermined area.

However, in this LED light, since the first reflecting surface 151 is arranged right above the light source 150, the light directly emitted from the light source 150 is blocked by the first reflecting surface 151 and is perpendicular. There is a problem in that a dark portion is formed in the center and the appearance as a light deteriorates because the light is not emitted in the direction.

On the other hand, as a means for solving such a problem, for example, there is an LED light shown in Patent Document 2.

[0010]

[Patent Document 2] International Publication No. 99/09349 (FIGS. 2 and 4)

FIG. 27 shows the LED light described in the publication, (a) is a vertical sectional view centering on the light source, and (b) is a sectional view.
Shows a sectional view taken along line KK of FIG. This LED
In the light, the light emitting element 160 is used as a light emitting source to form the dome portion 1.
61, a light source 162 having a base portion 161A, an incident surface 163, a first reflection area 164, and a first reflection surface 16
4A, a direct conduction area 165, a second reflection area 166, an irradiation surface 167, edges 168 and 169, posts 172 and 173, and an optical element 175 having pillow lenses 175A formed in an array. However, the extraction surface 166A and the step downs 166B are formed on the second reflection area 166 of the lens element 174.
Is formed around the first reflection region 164 at 360 degrees. Further, as shown in (b), the light source 162 is
By coupling the recesses 162A and 162B of the base portion 161A and the posts 172 and 173 of the lens element 174, the dome portion 161 is moved to the first reflection area 164.
Positioned in the center of.

In such a structure, when light is emitted from the light source 162, it is reflected by the first reflecting surface 164A in a direction orthogonal to the central axis direction of the light source 162, and the extraction surface 16 is further reflected.
The light A reflected by 6A in the central axis direction and emitted from the irradiation surface 167 and the light B emitted from the light source 162 directly through the conduction region 165 and emitted in the central axis direction are provided to the optical element 175. Light with an expanded irradiation range is incident.

However, the LED light described in the above publication has a problem that the thickness becomes large because it has the dome portion 161 for condensing the light emitted from the light source 162 on the central axis.

Further, the central axis of the lens element 174 and the light source 1
Since it is difficult to assemble the central axes of 62 so that they are completely aligned with each other, positional deviation easily occurs and brightness in all directions tends to be non-uniform. That is, since the light source 162 and the lens element 174 are formed separately and are positioned, the light source 162 for the first reflection area 164 of the lens element 174 is formed.
When the positional accuracy of the central axis of the
There is a problem in that the light quantity of the reflected light reflected in the total reflection direction by 4 becomes non-uniform and bright and dark (difference in brightness) occurs on the surface of the LED light. In particular, in the case of an optical system in which most of the emitted light of the light source 162 is emitted upward, the light distribution of the light source 162 itself and the central axis of the lens element 174 and the light source 162 are different from each other. The difference in brightness due to the variation in the optical characteristics due to the displacement in the vertical direction becomes remarkable. That is, in the above LED light, since the light emitted from the light emitting element 160 is collected and emitted by the dome portion 161, a slight misalignment occurs between the central axis of the light emitting element 160 and the central axis of the dome portion 161. Even with only this, a large variation occurs in the light distribution of the light condensed and emitted from the dome portion 161. Thus, the light source 16
In addition to the problem that the structure itself of 2 tends to cause variations in light distribution characteristics, further, as described above, due to the displacement of the lens element 174 which is a separate body at the time of attachment,
There is an inconvenience that the problem that the amount of the reflected light reflected in the total reflection direction by the first reflection region 164 becomes uneven is exacerbated.

Further, there is also a problem that the side light which cannot be condensed on the central axis by the dome portion 161 has a reduced light utilization efficiency and cannot increase the irradiation area. That is, the light source 16
Light emitted from 2 in the horizontal plane direction (X direction) is not reflected by the second reflective region 166, and light that is not reflected by either the first reflective region 164 or the second reflective region 166 is in the Z direction. Since it is not emitted, there is a problem that the light efficiency is poor.

Moreover, in the above LED light, since the light source 162 and the lens element 174 are separate bodies as described above, the light emitted from the light source 162 once passes through the air layer, and then the incident surface 163 of the lens element 174. Is incident on
Light loss may occur in the air layer or interface in the middle, and the light source 162
The interface between the lens element 174 and the lens element 174 may be contaminated, which may further lead to a loss of light. Further, since it is a separate body, it is liable to be displaced when a physical shock occurs, and an optical system in which the light emitting element and the reflecting mirror are placed close to each other cannot be established. In addition, there are problems that the number of parts and the number of assembling steps increase, and the variation in assembling accuracy increases.

[0017]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned problems and to make a light emitting element of a large area with a good appearance while taking advantage of the feature of LED such as thinness. The brightness is uniform in all directions,
Light emitting diode and LED with high external radiation efficiency
To provide lights.

[0018]

In order to solve the above problems, a light emitting diode of the present invention comprises a light emitting element mounted on a power supply means, and a sealing means made of a translucent material for sealing the light emitting element. A reflecting surface that faces the light emitting surface of the light emitting element and reflects light emitted by the light emitting element in a direction orthogonal to the central axis of the light emitting element or in a direction forming a large angle with the central axis,
The light emitting device may have a side emission surface that emits the light reflected by the reflection surface from a side surface in a direction orthogonal to the central axis of the light emitting device or in a direction forming a large angle with the central axis.

A central radiating surface for radiating the light emitted by the light emitting element in a direction substantially parallel to the central axis of the light emitting element may be provided at the center of the reflecting surface.

It is desirable that the central emitting surface is smaller than the light emitting surface of the light emitting element. For example, when the central emitting surface is circular, it is 0.1 mm or more and less than the diagonal length of the light emitting surface of the light emitting element. Is more desirable. The reason why the above range is desirable is that if the distance is less than 0.1 mm, the radiation effect from the central radiation portion cannot be expected so much, while if it exceeds the diagonal length of the light emitting surface, the radiation can be efficiently emitted in the horizontal direction. This is because it becomes impossible and when the reflection mirror is provided around the light emitting diode, the reflection intensity by the reflection mirror and the emission intensity from the central emission surface cannot be balanced. Further, the central radiation surface may be a flat surface, an R surface, a concave surface, a convex surface, or a combination thereof.

Further, the side surface emitting surface may emit, in addition to the light reflected by the reflecting surface, the light directly arriving from the light emitting element in a direction orthogonal to the central axis or in a direction forming a large angle with the central axis. .

Further, the central emitting surface and the reflecting surface can be arranged close to the light emitting element. The distance between the central emitting surface and the light emitting element is preferably, for example, in the range of 0.1 mm to 1.5 mm from the element emitting surface. When a wire bonding type light emitting element is used, The surface is 0.3 mm to 1.0 m from the light emitting surface of the light emitting element in the direction of the central axis of the light emitting element.
More preferably, it is formed in the range of m. The above range is more preferable because when the wire bonding type light emitting element is used, the wire is pulled out and bent, but if the wire is extremely bent, a wire breakage easily occurs, and this wire is also transparent. This is because the space needs to be at least 0.3 mm because it needs to be sealed with an optical resin. On the other hand, when the space is larger than 1.0 mm, the wire bonding type will be described later in the description of FIG. This is because, in the light emitting element, the solid angle increment of the reflecting surface is reduced and the difference from the case where the central radiating portion is not formed is reduced.

The outer diameter of the light-transmissive sealing means is preferably 5 to 15 mm. The reason for setting the above range is that if it is less than 5 mm, it is not possible to expect sufficient reflection efficiency on the reflecting surface, and if it exceeds 15 mm, damage to the light emitting element due to resin stress becomes large, which is not preferable.

Further, the LED light of the present invention is an LED light provided with a reflecting mirror around a light emitting diode,
The light emitting diode includes a light emitting element mounted on a power supply means, a sealing means made of a translucent material for sealing the light emitting element, and a light emitting element facing the light emitting surface side of the light emitting element. A reflecting surface that reflects in a direction that is orthogonal to the central axis of the light emitting element or forms a large angle with the central axis, and a light reflected by the reflecting surface from a side surface that is orthogonal to the central axis of the light emitting element or forms a large angle with the central axis. It is characterized by having a side emission surface that radiates in the direction of forming.

A central radiating surface for radiating the light emitted by the light emitting element in a direction substantially parallel to the central axis of the light emitting element may be provided at the center of the reflecting surface. Also, the LED
In the light, the reflecting mirror may be a plurality of substantially flat mirrors.

Further, the LED light according to the present invention includes a light emitting element, a first reflecting mirror provided above the light emitting element for reflecting light from the light emitting element in a lateral direction, and the first reflecting mirror.
And a second reflecting mirror for radiating the light reflected by the reflecting mirror above.

In the above structure, the reflecting surface of the second reflecting mirror can be divided into a plurality of parts.

As an example of the divided reflecting surface, a circular reflecting mirror becomes higher in a stepwise manner from the center, and each step portion is a ring-like reflecting surface inclined at about 45 degrees. And so on.

Further, the light reflected by the second reflecting mirror can be made substantially parallel light.

Further, the LED light according to the present invention is such that a light emitting element, an electric system for supplying electric power to the light emitting element, the light emitting element and the electric system are sealed, and the light emitting element is provided on the upper surface of the sealing surface. First to totally reflect the light emitted from the side surface
And a peripheral reflecting mirror (second reflecting mirror) that reflects upwardly the light totally reflected in the side surface direction.

Here, the upper surface of the sealing surface refers to the surface of the light transmissive material facing the light emitting surface of the light emitting element.

That is, the light emitted from the light emitting element is manufactured so as to be incident on the upper surface of the light transmissive material encapsulating the light emitting element at an angle larger than the critical angle.

Further, in the above structure, the shape of the side surface of the light transmissive material can be adjusted so that the light totally reflected in the side surface direction is refracted slightly downward.

An example of such a shape of the side surface is a part of the surface of an ellipsoid having the light emitting element as one focal point.

Further, a third reflecting mirror for reflecting light emitted to the side of the light emitting element upward can be provided inside the second reflecting mirror or the peripheral reflecting mirror around the light emitting element.

Further, the light emitting device can be mounted on a circuit board on a metal plate.

Further, the first reflecting mirror and the second reflecting mirror can be formed in an integrated optical body.

The second reflecting mirror may be a reflector that reflects by total reflection, and may include an auxiliary reflecting mirror for reflecting upwardly the light that has not been reflected and has been transmitted.

Further, the second reflecting mirror or the peripheral reflecting mirror may have a polygonal shape or a shape close to it when viewed from above.

Here, the polygon includes squares, rectangles, trapezoids, parallelograms, regular hexagons and the like.

Further, the first reflecting mirror is 6 with respect to the central axis.
It can reflect light in the range of 0 degrees or more.

[0042]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings.

(Embodiment 1) First, Embodiment 1 of the light emitting diode of the present invention will be described with reference to FIGS. In the light emitting diode 10 shown in FIG.
The light emitting element 1 having a size of 00 × 400 μm is the lead frame 2
On the other hand, an electrode having a diameter of 0.1 mm and a ball of gold wire (not shown) formed on the center of the light emitting element 1 at the center of the light emitting surface are mounted on the surface of a through an Ag paste (not shown). Counter electrode lead 2b with wire 3 having a diameter of 30 μm
Is electrically contacted with each other, and these are sealed with the translucent resin 4 and the optical surface is molded.

As shown in FIG. 2, the optical surface is composed of a central emitting surface 4a, a top reflecting surface 4b, and a side emitting surface 4c. Here, the central radiating surface 4a is located at the top of the light emitting element 1 by h
= 0.5 mm height and a diameter Wc = 0.3 mm, and the upper reflecting surface 4b is focused on the center of the upper surface of the light emitting element 1, passes through the end of the central emitting surface 4a, and has a symmetry axis. It is formed by rotating a parabola perpendicular to the z-axis around the z-axis. Further, 4c is a cylindrical surface substantially perpendicular to the z axis (having a slight taper for die cutting).
The outer diameter (diameter) of the translucent resin 4 having such a central radiating surface 4a, the upper reflecting surface 4b, and the side radiating surface 4c is W _M =
It is 7.5 mm.

When the translucent resin 4 has a predetermined outer diameter,
In order to obtain a large solid angle, a parabolic rotation shape (for example, 4b ′) having the same focal position and a small similarity ratio is used for the upper reflecting surface.
4b), the wire bonding type light emitting element requires a wire space above the light emitting element 1 as shown in FIG. That is, the light emitting element 1 has an electrode (n electrode or p electrode) on the upper surface thereof, and the wire 3 is bonded thereto. The wire 3 is pulled out and bent, but if it is bent excessively, a wire breakage easily occurs,
Since this wire 3 also needs to be sealed with a light-transmitting resin, at least 0.3 mm (wire 0.2 m
m, sealing 0.1 mm). For this reason, the optical surface is a parabolic upper reflecting surface 4b having a smaller similarity ratio than the virtual upper reflecting surface 4b 'shown by a wavy line, and a central emitting surface 4a is provided.

By using such an optical surface, the LED
Light can be emitted in the Z-axis direction from the center of the package, and the reflection efficiency in the direction substantially perpendicular to the Z-axis can be improved. That is, in FIG. 2, the central portion of the light emitting surface of the light emitting element 1 is set to a point O, and the angle from the point O to the edge direction of the upper reflecting surface with respect to the Z axis is θ _{0 in} the case of 4b ′ shown by the wavy line. = 60 degrees, while 4b indicated by the solid line
In the case of, θ ₁ = 65 degrees, and these are A ₀ = 3.1strad and A ₁ = with respect to the point O when viewed three-dimensionally.
The solid angle is 3.6 strad (in each case, the point O is the focal point, and the symmetry axis is a parabola whose axis is perpendicular to the Z axis and which is rotated around the Z axis). On the other hand, the angle θ ₂ from the point O to the end of the central radiation surface with respect to the Z axis is 17 degrees, and the solid angle with respect to the point O is A ₂ = 0.25 strad. In other words, by using the optical surface shown by the solid line, reflection in the direction substantially perpendicular to the Z axis cannot be expected in the portion where the central radiation surface is formed, so the solid angle is A ₂ = 0.25s.
Although it becomes negative by trad, the solid angle increment due to 4b 'being 4b is A ₁ -A ₀ = 0.5, and even if the above minus is subtracted, (A ₁ -A ₀ ) -A ₂ = 0. 0.25, which is an increment of 0.25. Therefore, the solid angle increment of the upper reflecting surface with respect to the light source is 0.25 / π, that is, about 10% increase, and the radiation efficiency in the direction substantially perpendicular to the Z axis can be improved.

The light emitting diode 1 of the first embodiment
At 0, the diameter is 0.3 m for a 400 μm square light emitting element.
Although the example in which the central radiation surface of m is formed has been described, the size is not limited to this, and other sizes may be used. However, if the central radiation surface 4a is made extremely wide, a lot of light is radiated from the upper surface, and the radiation efficiency in the direction substantially perpendicular to the Z-axis is reduced, and the original concept is lost. It is desirable to keep the size below. In addition, the distance h between the top emission surface and the central emission surface of the light emitting element 1 is 0.5 mm, and the diameter of the translucent resin 4 is 7.5 mm. However, the present invention is not limited to this, and the effect can be obtained. An appropriate value may be set within the range.

In FIGS. 3A, 3B, and 3C, when the diameter of the transparent resin is 5 mm, 7.5 mm, and 15 mm, respectively, the central radiation surface 4a is not formed (4 in FIG. 2).
b ') with the emission surface (4a and 4)
The solid angle increment of the upper reflecting surface with respect to the point O in b) is expressed as a function of h. From FIG. 3B, when the diameter of the translucent resin is 7.5 mm, h = 0.6 mm, and the solid angle increment can be maximized as compared with the case where the radiation surface is not formed. When h is larger than this, the difference from the case where the emitting surface is not formed becomes small, and the solid angle increment of the upper reflecting surface decreases. On the other hand, when h is made small, the solid angle occupied by the central emitting surface increases, so that the solid angle increment of the upper reflecting surface decreases. Further, the same tendency is observed even if the diameter of the translucent resin is changed. Such a tendency is more remarkable when the diameter of the translucent resin is smaller than when the diameter of the transparent resin is large, but when the diameter is 15 mm or less, the central radiating portion is provided, so that the solid angle is increased. The effect can be obtained. In view of the above results, it is desirable that h = 0.3 to 1.0 mm and the diameter of the translucent resin be 5 to 15 mm.

In FIGS. 2 and 3, it is theoretically assumed that the central emitting surface 4a is close to the light emitting surface of the light emitting element 1 as in the case where the diameter of the transparent resin is 15 mm and h = 0.3 mm. The angle (θ ₂ ) at the end of the central radiation surface 4a and its solid angle (A ₂ ) become large. Therefore, the solid angle increment ((A ₁ −A ₀ ) −A ₂ ) of the upper reflecting surface 4 b with respect to the point O when the radiation surface is formed is compared with the case where the central radiation surface is not formed.
Becomes negative as shown in FIG. However, in reality, an electrode with a diameter of 0.1 mm is formed in the central portion of the light emitting surface of the light emitting element immediately below the central emitting surface 4a, and a ball of a gold wire is present on the electrode, and both are in the non-light emitting portion. Therefore, the amount of external radiation from the central radiation surface does not actually increase. Therefore, the influence of the solid angle increment due to A ₂ becoming negative is practically small, and the improvement of the radiation efficiency in the direction substantially perpendicular to the Z axis due to the increment of A ₁ -A ₀ can be expected.

Further, the central radiating surface 4a is not limited to the planar shape as shown in FIG. 4A, but only the boundary portion between the central radiating surface 4a and the upper reflecting surface 4b is R-shaped as shown in FIG. 4B,
As shown in (c), the entire central radiation surface 4a has an R shape,
It may be concave as in (d) or convex as in (e). Further, the upper reflecting surface 4b is not limited to a parabolic rotating body having the center of the upper surface of the light emitting element as a focal point and having the X-axis direction as the axis of symmetry, and rotating the parabola whose axis of symmetry is inclined from the X-axis direction as shown in FIG. The body may be a parabola or a long focus ellipse or a hyperbolic rotator. Still another shape may be rotated.

Further, it is possible to use a light emitting element having an electrode not at the center of the upper surface but at the peripheral portion of the upper surface. in this case,
From the viewpoint of the wire space, the above-mentioned limitation of the dimension of h does not occur. However, if they are brought too close to each other, the solid angle (to the light emitting element) of the central emitting surface 4a becomes significantly large on the upper reflecting surface 4b. In addition, when the resin is sealed, if the gap is narrow, unfilling is likely to occur, and unnatural stress is likely to be applied to the element even after the sealing. Therefore, as described above, the light emitting element 1
It is desirable to provide a predetermined space between the upper radiating surface and the central radiating surface.

The form of the package is not limited to that shown in FIG. 1, but as shown in FIG. 6, the insulating layer 6 is formed on the metal substrate 7.
The copper foil patterns 5a and 5b may be formed on top of which the light emitting element 1 is formed, or the leads 8a and 8b may be drawn downward as shown in FIG. Further, a light-emitting element coated with a phosphor may be used, but in that case, as shown in FIG.
Light source 9 in which the inside is coated to seal the light emitting element 1
Can be used.

The light emitting diode 10 of the first embodiment can be manufactured, for example, by the transfer molding method. The manufacturing method by the transfer molding method will be described below with reference to FIG. First, the light emitting element 1 is face-up bonded to the lead frame 2a formed by pressing. Next, the Al bonding pad of the light emitting element 1 and the lead frame 2b are electrically connected by the wire 3. Next, the lead frames 2a and 2b on which the light emitting element 1 is mounted are positioned and mounted on the mold 20B, and the mold 20A is lowered from above and sandwiched to hold the positions of the lead frame and the mold. Next, the transparent epoxy resin 4 containing the peeling component is injected into the mold. next,
The transparent epoxy resin 4 is cured at 160 ° C. for 5 minutes. Next, the molds 20A and 20B are separated into upper and lower parts, and the light emitting diode 10 in which the transparent epoxy resin 4 is cured is taken out. In manufacturing the light emitting diode 10 by such a transfer molding method, the inside of the mold 20 is held with the lead frames 2a and 2b held between the molds 20A and 20B.
Since the transparent epoxy resin 8 is injected into C and 20D, the positioning accuracy between the light emitting element 1 and the optical surface can be realized with a high accuracy of ± 0.1 mm, and the light emitting diode 10 using the proximity optical system can be realized. It is possible to prevent variations in light distribution characteristics due to individual differences.

The light emitting diode 10 can also be manufactured by a casting mold method.
Hereinafter, the manufacturing method by the casting mold method will be described with reference to FIG.
A description will be given with reference to 0. First, the lead frames 21a and 21b are punched by pressing. At this time, the lead frames 21a and 21b are not divided, and a plurality of rear ends are connected by leads. Next, the rear end connected by the lead is fixed to the support member. Next, the light emitting element 1 is face-up bonded to the tip of the lead frame 21b. Next, the Al bonding pad of the light emitting element 1 and the lead frame 21a are electrically connected by the wire 3. Next, the lead frames 21a and 21b are moved onto the casting 20F for molding. next,
The resin 4 is injected into the casting 20F. Next, the lead frames 21a and 21b are immersed in the casting 20F filled with the resin 4. Next, the space 20E in which the casting 20F and the lead frames 21a and 21b are arranged is evacuated to remove bubbles from the resin 4. Next, the resin 4 is cured under the curing conditions of 120 ° C. and 60 minutes. Next, the light emitting diode 4 obtained by curing the resin 4 is taken out from the casting 20F. In the casting mold method, since the tips (free ends) of the lead frames 21a and 21b are not supported and constrained by casting, the positioning accuracy of the light emitting element 1 and the optical surface is ± 0.2 mm, which is lower than that in the transfer molding method. However, by curing the transparent epoxy resin 4 for a long time, the thermal stress unevenness becomes small, and the lead frames 21a and 21b and the transparent epoxy resin 4 are less likely to be peeled off. Note that it is possible to stabilize the light distribution characteristics by managing the manufacturing process and selecting the light distribution characteristics of the light emitting element 1.

(Second Embodiment) A second embodiment of the present invention will be described with reference to FIGS. 11 to 19.

FIG. 11A is a plan view showing the overall structure of the LED light according to the second embodiment of the present invention, FIG. 11B is a sectional view taken along line AA of FIG. 11A, and FIG. 11C is of FIG. It is an enlarged view of P part. FIG. 12 is an LE according to the second embodiment of the present invention.
It is a longitudinal cross-sectional view of an LED which is a light source of a D light. FIG.
FIG. 6 is a plan view showing a structure in which a periphery of an LED light according to a second embodiment of the present invention is cut into a rectangle and a plurality of pieces are combined to cover a certain range. FIG. 14 is an LE light source of the LED light according to the second embodiment of the present invention.
It is a longitudinal section showing the 1st modification of D. FIG. 15 is a light source L of the LED light according to the second embodiment of the present invention.
It is a longitudinal section showing a 2nd modification of ED.

FIG. 16 shows L according to the second embodiment of the present invention.
It is explanatory drawing which shows the 3rd modification of LED which is a light source of ED light. FIG. 17 shows L according to the second embodiment of the present invention.
It is a partially expanded view which shows the 4th modification of an ED light. 18A is a plan view showing a fifth modified example of the LED light according to the second embodiment of the present invention, and FIG. 18B is a BB line of FIG. 18A.
Sectional drawing, (c) is CC sectional view of (a), (d) is DD sectional view of (a). 19A is a plan view showing a sixth modification of the LED light according to the second embodiment of the present invention, FIG. 19B is a sectional view taken along line EE of FIG. 19A, and FIG. It is a FF sectional view.

As shown in FIG. 11, the second embodiment is used.
LED light 1 of LE is a light source in the center of the circular body
The D32 is mounted, and the periphery thereof is surrounded by a concentric stepped reflecting mirror 33 as a second reflecting mirror. Here, the central axis of the light emitting element is the Z axis, and the top surface of the light emitting element is the origin thereof, and the X axis and the Y axis intersect at a right angle at this origin. The same applies to the following modifications and embodiments.

As shown in FIG. 11 (c), the reflecting surface 33a of the reflecting mirror 33 is approximately 4 with respect to the XY plane in the figure.
It is inclined at 5 degrees. The reflecting mirror 33 is formed of a transparent acrylic resin and then vapor-deposited with aluminum to form a reflecting surface.

Next, regarding the configuration of the LED 32, FIG.
Will be described with reference to. As shown in FIG. 12, XY
The light emitting element 36 is mounted on the tip of the lead plate 35a having the larger area of the pair of lead plates 35a and 35b provided on the plane. The electrode on the upper surface of the light emitting element 36 and the tip of the lead plate 35b are bonded by a wire 37 for electrical connection. The tips of the lead plates 35a and 35b as the electrical system, the light emitting element 36, and the wire 37
Is set in a resin-sealing die and is resin-sealed in a cross-sectional shape as shown in the figure by a transparent epoxy resin 38 as a light-transmitting material. Here, the upper surface 3 of the LED 32
There is a flat surface 39a at the center of 9
9a, the first reflecting mirror 39b is focused on the center of the light emitting surface of the light emitting element 36, and a part of a parabola whose symmetry axis is in the X axis direction is within 60 degrees from the origin to the Z axis. It has the shape of an umbrella rotated about the Z axis (and is therefore not a paraboloid of rotation). Also LED
The side surface 40 of 32 forms a part of a spherical surface centered on the light emitting element 36. The LED 32 having such a configuration is fixed to the center of the circular LED light 31.

The radiation principle of the LED light 31 having such a structure will be described with reference to FIGS. 11 and 12.
When a voltage is applied to the lead plates 35a and 35b of the LED 32, the light emitting element 36 emits light. Of the light emitted from the light emitting element 36, the light directed in the Z direction, that is, right above is the flat surface 39.
It is radiated from a to the outside of the transparent epoxy resin 38, transmitted through a transparent front plate (not shown) which is covered on the LED light 31, and radiated to the outside. Further, among the light emitted from the light emitting element 36, the light within the range of 60 degrees or more with respect to the Z axis reaches the upper surface 39 as the first reflecting mirror, and these lights have a large incident angle on the upper surface 39. All are totally reflected and go to the side surface 40. Here, since the upper surface 39 has a shape in which a part of a parabola having the light emitting element 36 as the focal point and the X axis as the axis of symmetry is rotated around the Z axis, all the light reflected by the upper surface 39 is X−.
Since the light travels parallel to the Y plane and the side surface 40 forms a part of a spherical surface centered on the light emitting element 36, the light travels almost parallel to the surface and is radiated to the outside in a substantially planar shape in the direction of 360 degrees around the Z axis. It Further, the light directly reaching the side surface 40 from the light emitting element 36 travels straight without refraction because the side surface 40 forms a part of a spherical surface centering on the light emitting element 36, and is emitted to the outside.

A staircase-shaped reflecting mirror 33 serving as a second reflecting mirror is provided at the tip of the reflecting surface 33 having an inclination of about 45 degrees.
Although there is a, the light emitted from the upper surface 39 and emitted substantially parallel to the XY plane and the light emitted directly from the side surface 40 are X.
Since the light is radiated in parallel to the −Y plane, the light reflected by the reflecting surface 33a travels almost vertically to the upper direction,
At least within a range of 20 degrees from the Z axis, the light is externally radiated through a transparent front plate (not shown). The light described as “parallel” in the above is not perfectly parallel because of the size of the light emitting element 36, but all the lights are substantially parallel and at least within a range of 20 degrees from the Z axis. It will surely come in.

In this way, the LED of the second embodiment
The light 31 is thin and can illuminate a large area with a single light emitting element by taking advantage of the thinness which is a feature of the LED, and high external radiation efficiency can be obtained.

As an application of the LED light 31 of the second embodiment, as shown in FIG. 13, the circular LED light 1 is cut into a square or a part thereof, and the pieces 41a, 4 are cut.
1b, 41c, 41d, 41e, 41f are manufactured, and these are combined as shown in the figure to form an integrated LED light 41 having a plurality of light emitting elements for covering a predetermined area.
Can be

[Modification 1] As a first modification of the LED light 31 according to the second embodiment, as shown in FIG. 14, a pair of lead plates 42a and 42b are recessed only around the light emitting element 36 to form a first modification. It is assumed to be a reflector of 3. As a result, FIG.
In the basic form, the light is directly emitted directly above the light emitting element 36, whereas the light is also emitted upward from the periphery of the light emitting element 36 in the LED, and more light is emitted as a whole. It looks as if they are appearing, and the effect is that the appearance is improved.

[Modification 2] As a second modification of the LED light 31 of the second embodiment, a pair of lead plates 43a,
A pattern as shown in FIG. 15 may be provided on 43b by half etching or a stamping pattern so that light emitted obliquely downward from the light emitting element 36 is reflected and light is emitted upward. By forming a plurality of concentric reflecting mirrors, it is possible to make the entire body look like emitting light as in the first modification, and it is possible to improve the appearance. In this case, the adhesive area between the transparent epoxy resin 38 and the lead plates 43a and 43b is increased, and there is also an effect of reducing peeling defects by making the adhesive shape nonplanar. Particularly, it is effective in the case of a large current type that generates a large amount of heat.

[Modification 3] As a third modification of the LED light 31 of the second embodiment, as shown in FIG. 16, the side surface shape of the sealing portion of the LED with the transparent epoxy resin 38 is changed. Is also good. The side surface 40 of the basic example is a part of a spherical shape centered on the light emitting element 36, and
The light emitted from the side surface is incident on the side surface 40 substantially vertically and proceeds straight as it is. However, in the third modification, the side surface 44 forms a part of an ellipsoidal surface having the light emitting element 36 as one focal point. The light emitted from the light emitting element 36 is emitted from the side surface 44.
In the direction of straight ahead, it is slightly bent downward. Therefore, even if the staircase-shaped reflecting mirror 33 around the LED is moved to a lower position, the LED light has high external radiation efficiency. As a result, the LED light can be made thinner.

[Modification 4] As a fourth modification of the LED light 1 according to the second embodiment, as shown in FIG.
The reflection on the side surface of the upper surface 39 as the first reflecting mirror is not dependent on the total reflection at the boundary surface between the transparent epoxy resin 38 and the air, and the upper surface 39 is plated or vapor-deposited to attach the metal reflection film 45. May be. In this case, if the light emitting element 36 is flattened directly above, the light emitted right above will not be radiated to the outside. The shape needs to be rotated around the Z axis.

[Fifth Modification] As a fifth modification 51 of the LED light 31 of the second embodiment, the light emitting points may be scattered instead of making the whole of the LED light 31 illuminate substantially uniformly as in the basic example. . That is, as shown in FIG. 18A, the circular reflecting mirror 53 as the second reflecting mirror is divided into a fan shape,
LEDs as shown in FIGS. 18 (b), (c), and (d)
The distance from 52 to the reflecting surface 53a is divided into several types.
As a result, the positions where the reflected light is radiated are scattered in a circle when viewed from above, and there is an effect that it looks shiny and beautiful. At this time, the LED 52 is provided with the minute central radiating surface 4a, which has the effect of further improving the appearance. That is, the central emitting surface 4a and the reflecting surface 53a
It is possible to equalize the brightness of the light emitted from the outside and to arrange the bright spots in a well-balanced manner. The amount of light externally radiated from the central radiation surface 4a is a very small ratio such as 1/10 or less with respect to the amount of light externally emitted after being radiated to the periphery of the LED 52 and then reflected by the circular reflecting mirror 53, and most of them are LED52. Luminance becomes equal by radiating to the surroundings. More specifically, the larger the circular reflecting mirror 53, the smaller the ratio of the amount of light externally emitted from the central emitting surface 4a may be. Further, the effect of shining brilliantly and beautifully is obtained when the reflecting surface 53a is a substantially flat surface or a convex surface. As the curvature of the convex surface and the convex surface is larger, the central radiation surface 4a is larger.
The ratio of the amount of light emitted from the outside may be small. Note that in this modified example 5, all the light from the LEDs 52 must be reflected by the one-step reflecting surface 53a in each fan shape, so the height of each reflecting surface 53a is as shown in FIG.
As shown in (c) and (d), it is desirable that the height is the same as the overall height h of the circular step-shaped reflecting mirror 33 of the basic example shown in FIG. 11 (b). Further, although it has been described that the luminance is the same, the luminance may be increased such that the luminance is higher toward the periphery and vice versa.

[Modification 6] As a sixth modification 54 of the LED light 31 of the second embodiment, as shown in FIG. 19, a reflecting mirror 56 as a second reflecting mirror is divided into a fan shape. The shape of the reflecting mirror 56 can be approximated to a square as one of the polygons by changing the lengths. That is, as shown in FIGS. 19B and 19C, in the shortest fan shape, from the reflecting surface 56a to the next reflecting surface 56a.
If the length up to a is L, then the longest fan shape deviated from the fan shape by 45 degrees, the reflecting surface 56a to the next reflecting surface 5
The length up to 6a is √2L. As a result, FIG.
As shown in, a plurality of square LED lights 41
Even when a, ... Are connected, since it is not necessary to cut the circular LED light 31 into a square shape, there is no reduction in external radiation efficiency, and a brighter connected light can be obtained. Further, when a substantially square LED is used as the light source instead of the substantially cylindrical LED 55, there is also an advantage that the distance from each side surface of the LED to the reflecting mirror 56 is substantially equal over the entire circumference.

(Third Embodiment) Next, a third embodiment of the present invention will be described with reference to FIG. FIG. 20 is a vertical cross-sectional view showing the overall configuration of an LED used in the LED light according to the third embodiment of the present invention.

As shown in FIG. 20, the third embodiment is provided.
In the LED 61, the light emitting element 64 is mounted on the tip of the lead plate 63a of the pair of lead plates 63a and 63b.
The electrode on the upper surface of the light emitting element 64 and the tip of the lead plate 63b are bonded by a wire 65 to establish an electrical connection. Lead plates 63a, 63b as these electric systems
The tip, the light emitting element 64, and the wire 65 are sealed with a transparent epoxy resin 66 as a light transmissive material. The outer shape of the transparent epoxy resin 66 is a shape obtained by scooping out the upper part of a spherical shape centering on the light emitting element 64 into a conical shape. In this case, the light emitted from the light emitting element 64 is
Although the light is totally reflected by the upper surface 62 as a reflection mirror of, the reflected light corresponds to the emitted light from the reflection point of the light emitting element 64 with respect to the upper surface 62, so that it is not condensed light but from the side surface 67 with a divergence angle. Is emitted. Therefore, the circular step-shaped reflecting mirror as the second reflecting mirror that reflects these lights upward is also required to be longer in the Z direction than the LED 32 used in the second embodiment.

However, such a simple conical reflecting surface 62 can be used when a relatively wide light distribution is acceptable as the LED light or when an extremely thin LED light is not required.

(Fourth Embodiment) Next, a fourth embodiment of the present invention will be described with reference to FIG. FIG. 21 is a vertical sectional view showing the overall structure of the LED light according to the fourth embodiment of the present invention.

As shown in FIG. 21, the fourth embodiment is provided.
LED light 70 is a pair of lead plates 63a, 63b.
Of these, the light emitting element 64 is mounted on the tip of the lead plate 63a, and the electrode on the upper surface of the light emitting element 64 and the tip of the lead plate 63b are bonded by the wire 65 to make electrical connection. Lead plates 63a as these electric systems,
The tip of 63b, the light emitting element 64, and the wire 65 are sealed with a transparent epoxy resin 66. The shape of the transparent epoxy resin 66 is a normal cylindrical shape, and therefore the upper surface of the transparent epoxy resin 66 cannot serve as the first reflecting mirror. Instead, a circular optical body 68 shaped like an umbrella formed of transparent acrylic resin is attached to the upper surface of the transparent epoxy resin 66 with a light transmissive material 67 interposed therebetween. An upper surface 69 of the optical body 68 has a shape in which a part of a parabola whose focal point is the light emitting element 64 and whose axis of symmetry is the X axis direction is rotated around the Z axis.

Further, the lower surface 71 of the optical body 68 has a circular step shape with a step of about 45 degrees in order to replace the circular step reflection mirror of the second embodiment as the second reflection mirror. ing. Then, aluminum vapor deposition 72 is applied to the lower surface 71,
Overcoating (not shown) is performed thereon to protect the aluminum vapor deposition film. In the fourth embodiment,
The degree of freedom of the overcoat after forming the evaporation mirror surface can be increased. That is, the overcoat may be colored and the thickness is not limited.

The LED light 70 having the above structure is
When a predetermined voltage is applied to the pair of lead plates 63a and 63b, the light emitting element 64 emits light, and the light that goes directly upward is uninterrupted, so it goes straight on and passes through a transparent front plate (not shown). And then released to the outside. Further, the light emitted obliquely from the upper side to the side passes through the light transmissive material 67 and enters the optical body 68, and the light striking the upper surface 69 as the first reflecting mirror is totally reflected. Since the upper surface 69 has a shape in which a part of a parabola whose focal point is the light emitting element 64 is rotated around the Z axis, all are reflected in the side surface direction substantially parallel to the XY plane. Then, it is reflected upward by the circular staircase-shaped reflecting mirror 71 as a second reflecting mirror substantially parallel to the Z axis, passes through the front plate from the upper surface 69, and is radiated to the outside. Light that has entered the optical body 68 and directly hits the circular step-shaped reflecting mirror 71 is also emitted upward.

In this way, while taking advantage of the thinness which is a feature of the LED, it is possible to illuminate a large area with one light emitting element with a good appearance by using an ordinary cylindrical LED, and to obtain a high external radiation efficiency. Will be an LED light.

(Fifth Embodiment) Next, a fifth embodiment of the present invention will be described with reference to FIG. FIG. 22 is a vertical sectional view showing the overall configuration of the LED light according to the fifth embodiment of the present invention.

As shown in FIG. 22, the fifth embodiment is provided.
LED light 80 is an aluminum base 8 as a metal plate.
It is formed on one. On the aluminum base 81,
A circuit pattern 83 is formed so as to sandwich the insulating layer 82, and the light emitting element 84 is mounted on the circuit pattern 83 and the wire 85 is formed.
It is bonded and is electrically connected. A circuit pattern 83, a light emitting element 84,
An optical body 8 formed on the wire 85 by a transparent acrylic resin having a hemispherical shape 91 hollowed out and shaped like an umbrella.
7 is covered. At this time, the hemispherical portion 91 is filled with a transparent silicon resin as a light transmissive material, and the circuit pattern 83, the light emitting element 84, and the wire 85 are sealed without any gap. With the optical member 87 fixed in this way,
The upper surface 88 has a shape in which a part of a parabola whose focal point is the light emitting element 84 is rotated around the Z axis.

The lower surface 89 of the optical body 87 has a circular step shape with a step of about 45 degrees as the second reflecting mirror. Then, aluminum vapor deposition 90 is applied to the lower surface 89, and overcoating (not shown) is performed on the lower surface 89 to protect the aluminum vapor deposition film. Also in the fifth embodiment, the degree of freedom of the overcoat after the vapor deposition mirroring can be increased. That is, the overcoat may be colored and the thickness is not limited.

When the light emitting element 84 of the LED light 80 having the above-mentioned structure emits light, there is no obstruction for the light which goes straight up, so that the light goes straight on and passes through a transparent front plate (not shown) to be emitted to the outside. . Further, the light emitted obliquely from above to the side passes through the transparent silicon resin 86 and enters the optical body 87, and the light hitting the upper surface 88 as the first reflecting mirror is totally reflected. Since the upper surface 88 has a shape in which a part of a parabola whose focal point is the light emitting element 84 is rotated around the Z axis, all of the upper surface 88 is reflected in the lateral direction substantially parallel to the XY plane. Then, it is reflected upward by the circular step-shaped reflecting mirror 89 as the second reflecting mirror substantially parallel to the Z-axis and transmitted from the upper surface 88 through the front plate to be radiated to the outside. Light that has entered the optical body 87 and directly hits the circular step-shaped reflecting mirror 89 is also radiated upward.

In the LED light 80 of the fifth embodiment, since it is formed on the aluminum base 81 having excellent thermal conductivity, the heat dissipation is greatly improved and a large current is applied to the light emitting element 84. However, there is an advantage that a large light output can be obtained because heat saturation does not occur.

In this way, a book which is thin and has a large heat dissipation property, can obtain a large light output without being restricted by thermal saturation, and can be an LED light having a high luminous intensity, and can also be made thin in a large area. In the embodiment, a large area and high brightness LED light can be realized.

(Sixth Embodiment) Next, a sixth embodiment of the present invention will be described with reference to FIG. FIG. 23 is a vertical sectional view showing the overall structure of the LED light according to the sixth embodiment of the present invention.

As shown in FIG. 23, the sixth embodiment
The LED light 100 is also formed on the aluminum base 95 as a metal plate. A circuit pattern 97 is formed on the aluminum base 95 with an insulating layer 96 interposed therebetween, and a light emitting element 98 is mounted on the circuit pattern 97 and the wire 9 is formed.
Bonding is performed at 9 to make an electrical connection. Circuit pattern 97 and light emitting element 9 as these electric systems
8, the wire 99 is sealed with a transparent epoxy resin 102 as a light transmissive material. From above, an optical body 101 molded with a circular transparent acrylic resin is fixed. In this fixed state, the upper surface 103 of the optical body 101 has a shape obtained by rotating a part of a parabola whose focal point is the light emitting element 98 around the Z axis, and serves as a first reflecting mirror. Function.

The lower surface 104 of the optical body 101 is
It has a circular step shape with a step of about 45 degrees as a reflection mirror of. Here, the LED light 1 of the sixth embodiment
In No. 00, the lower surface 104 of the optical body 101 is not metal-deposited. That is, the light emitting element 9 reflected in the lateral direction on the upper surface 103 of the optical body 101 as the first reflecting mirror.
The light from 8 is reflected upward by total reflection on the lower surface 104 of the optical body 101 as the second reflecting mirror. That is,
Even if metal deposition is not performed on the lower surface 104 of the optical body 101,
Most of the light is reflected upward only by total reflection on the lower surface 104. In order to reflect the light that has penetrated through the lower surface 104 without being totally reflected, the auxiliary reflector 105 is used as the optical member 101.
It is fixed on the circuit board 97 with a lower surface 104 and an air layer underneath. A reflection surface is formed on the upper surface of the auxiliary reflector 105 by plating, and the light penetrating the lower surface 104 is reflected upward.

As described above, in the LED light 100 according to the sixth embodiment, it is not necessary to deposit metal on the lower surface 104 of the optical body 101 which also serves as the first reflecting mirror and the second reflecting mirror, and the auxiliary reflection is performed. By simply providing the body 105 and applying simple plating coating, almost all the light emitted from the light emitting element 98 can be externally radiated upward, and high external radiation efficiency can be obtained. In addition, the LED light 1 of the sixth embodiment
In No. 00 as well, since it is formed on the aluminum base 95 having excellent thermal conductivity, the heat dissipation is greatly improved, and even if a large current is applied to the light emitting element 98, thermal saturation does not occur and a large light output is obtained. There is an advantage that it can be obtained.

In this way, a high external radiation efficiency can be obtained in a simple process, a thin type and a large heat radiation property can be obtained, a large light output can be obtained without being restricted by thermal saturation, and a bright radiant light can be obtained. It becomes a LED light.

(Seventh Embodiment) Next, a seventh embodiment of the present invention will be described with reference to FIG. Figure 24
(A) is a top view which shows the whole structure of the LED light concerning Embodiment 7 of this invention, (b) is GG sectional drawing of (a).

As shown in FIG. 24, the seventh embodiment is shown.
In the LED light 110, the lower surface 113 is a stepwise reflecting surface as a second reflecting mirror, and an optical body 111 molded of a transparent acrylic resin having a cylindrical space 114 in the center thereof, The LED light 31 of the second embodiment fixed in the central space 114 is combined with the LED 32. That is, the LED 32 seals the light emitting element 115 and the like with a transparent epoxy resin, and
The upper surface is a parabolic surface 116 as a first reflecting mirror, and the light emitted from the light emitting element 115 and reflected in the lateral direction by the upper surface 116 is reflected upward by the lower surface 113 of the optical body 111 and is not shown. It is radiated to the outside through the transparent front plate.

Here, the light emitted directly from the upper portion of the side surface 117 of the LED 32 (without being reflected by the upper surface 116) is:
In the LED light 31 of the second embodiment, it follows the route indicated by the chain double-dashed line and ends without being effectively reflected without being reflected upward, but in the LED light 110 of the seventh embodiment, it is broken line. Optical body 111
The light is reflected by the horizontal upper surface 112 and is reflected upward by the lower surface 113 to be effectively used. As a result, the LED light is thin and has high external radiation efficiency. In addition, the space 11
Since the light incident on the beam No. 4 is refracted in the direction having a large angle with respect to the Z axis, the brightness of the peripheral portion when viewed from above in FIG.

In each of the above-mentioned embodiments, the transparent epoxy resin is mainly used as the light-transmitting material for sealing the light emitting element and the like, but other light-transmitting materials may be used.

In each of the above embodiments, the second
Although a transparent acrylic resin is used as the reflecting mirror or as an optical body that also serves as the first reflecting mirror and the second reflecting mirror, other materials such as other transparent synthetic resins can be used.

Further, although it has been described that the light emitted from the center of the LED is obtained by providing the central emitting surface, the upper surface from the light emitting element is changed by using a large-sized light emitting element or by bringing the upper surface optical system into close proximity. The incident angle to the optical system may be within the critical angle, and in particular, the central radiation surface may not be provided to obtain the emitted light from the center of the LED.

On the other hand, when a light emitting element having a narrow light distribution is used in addition to the above, sufficient side emission can be obtained even if the top optical system is not necessarily close to each other.

The configuration, shape, quantity, material, size, connection relationship, etc. of the other parts of the LED light are not limited to those in the above-mentioned respective embodiments.

[0098]

As described above, the light emitting diode of the present invention includes the light emitting element mounted on the power supply means, the sealing means using the translucent material for sealing the light emitting element, and the light emitting element of the light emitting element. A reflecting surface that faces the light emitting surface and reflects light emitted from the light emitting element in a direction orthogonal to the central axis of the light emitting element or in a direction forming a large angle with the central axis, and the light reflected by the reflecting surface is emitted from the side surface. It is characterized in that it has side emission surfaces that radiate in a direction that is orthogonal to the central axis of the element or forms a large angle with the central axis.

Therefore, the translucent material allows the central axes of the reflecting surface and the side emitting surface, which are optical surfaces, to be aligned with the central axes of the light emitting elements with high accuracy, and the light emitted from the light emitting elements can be emitted. Since the light is uniformly reflected by the reflecting surface, the brightness of the emitted light is uniform in all directions regardless of the location. Therefore, the LE having the conventional structure in which the reflecting mirror is provided outside the conventional LED that collects and radiates the dome portion
A conventional problem related to the dispersion of the light distribution characteristics, in which the D light is included, the distribution of the light distribution in the LED itself is likely to occur, and the positional deviation from the reflecting mirror provided outside the LED is likely to occur. Can be resolved. In addition, since the light-emitting element can be integrally sealed with the light-transmissive material, there is no displacement even if a physical shock occurs even after manufacturing, and the interface between the light-emitting element and the reflecting surface does not occur. Since there is no such thing as dirt, there is no possibility that dirt or the like will enter, and light loss due to an interface or dirt will not occur. Further, since the light emitting element is directly sealed in the translucent material, the total thickness can be reduced, and the feature of the LED, which is thinness, can be maximized.

Further, when a central emitting surface for emitting the light emitted from the light emitting element in a direction substantially parallel to the central axis of the light emitting element is provided in the central portion of the reflecting surface, the light is emitted upward from the light emitting element. Since the emitted light can be directly extracted from the central emitting surface, the central part of the light emission does not become a hollow state,
It can improve the appearance.

Further, the central radiation surface is 0.3 mm to 0.3 mm in the central axis direction of the light emitting element from the light emitting surface of the light emitting element.
When formed in the range of 1.0 mm, the solid angle of the reflecting surface can be increased to improve the optical characteristics, and the central emitting surface can be formed to bring the reflecting surface close to the light emitting element. Even if there is, it becomes possible to secure a bonding space at the time of wire bonding and a space for resin molding.

Further, by making the central emitting surface smaller than the light emitting area of the light emitting element, when the reflecting mirror is provided around the light emitting diode, the balance of the reflection intensity by the reflecting mirror and the emission intensity of the central emitting surface. It is possible to take off and make it look good.

The side emission surface emits light that directly arrives from the light emitting element in addition to the light reflected by the reflection surface in a direction orthogonal to the central axis or forming a large angle with the central axis. Light emitted sideways from the element and not reflected by the upper reflecting surface is also radiated to the outside by the side emitting surface like the light reflected by the upper reflecting surface, so that high external radiation efficiency can be obtained. .

The LED light of the present invention is an LED light having a reflecting mirror around a light emitting diode,
The light emitting diode includes a light emitting element mounted on a power supply means, a sealing means made of a translucent material for sealing the light emitting element, and a light emitting element facing the light emitting surface side of the light emitting element. A reflecting surface that reflects in a direction that is orthogonal to the central axis of the light emitting element or forms a large angle with the central axis, and a light reflected by the reflecting surface from a side surface that is orthogonal to the central axis of the light emitting element or forms a large angle with the central axis. It is characterized by having a side emission surface that radiates in the direction of forming.

Therefore, the light emitted from the light emitting element is uniformly reflected by the reflecting surface of the light emitting diode and is evenly emitted in the direction substantially orthogonal to the central axis of the light emitting element. It is uniform regardless of location. As described above, the light uniformly emitted from the light emitting diode is further reflected by the reflecting mirror provided around the light emitting diode, so that it is possible to obtain a large area of externally emitted light.

Further, if a central emitting surface for emitting the light emitted from the light emitting element in a direction substantially parallel to the central axis of the light emitting element is provided at the center of the reflecting surface, the light is emitted upward from the light emitting element. Since the light can be directly extracted from the central emitting surface, the central part of the light emission does not have a hollow state, the light becomes uniform, and the appearance is improved.

If the reflecting mirrors are a plurality of substantially flat mirrors, an LED light can be obtained which is capable of obtaining externally radiated light with glitter.

Further, the LED light according to the present invention includes a light emitting element, a first reflecting mirror provided above the light emitting element, for reflecting light from the light emitting element in a lateral direction, and the first reflecting mirror.
And a second reflecting mirror for radiating the light reflected by the reflecting mirror above.

As a result, only by disposing the first reflecting mirror that reflects in the side direction directly above the light emitting element, the second reflecting mirror that reflects this reflected light upward becomes larger as it is separated from the first reflecting mirror. Area external radiation can be obtained. Further, since all the light reflected on the side surface is optically controlled and reflected upward to be radiated to the outside, high external radiation efficiency can be obtained.

In this way, by taking advantage of the thinness characteristic of the LED, it is possible to illuminate a large area with a single light-emitting element and obtain an LED light with high external radiation efficiency. .

Further, in the above-mentioned structure, since the reflecting surface of the second reflecting mirror is divided into a plurality of parts, the positions where the reflected light is radiated are scattered in a circle when viewed from above, and the twinkling of the second reflecting mirror shines. The effect is that it looks bright and beautiful.

Further, by making the light reflected by the second reflecting mirror substantially parallel light, when the radiation surface is substantially flat, almost all the light is radiated to the outside and an LED light having a high external radiation efficiency is obtained. Become. Further, when it is desired to expand the radiation angle to about 20 degrees as in the vehicle-mounted backlight described above, the boundary surface or the radiation surface may be controlled to be uneven.
In addition, if the light reflected by the second reflecting mirror is substantially parallel light, the emitted light can be controlled in any way, so that the LED light has a high degree of freedom in light control.

In the LED light according to the present invention, a light emitting element, an electric system for supplying electric power to the light emitting element, the light emitting element and the electric system are sealed, and the light is emitted from the light emitting element on the upper surface of the sealing surface. It is provided with a light-transmissive material that constitutes a first reflecting mirror that totally reflects the reflected light in the side surface direction, and a second reflecting mirror that upwardly reflects the light that is totally reflected in the side surface direction. .

That is, the light emitted from the light emitting element is manufactured so as to be incident on the upper surface of the light transmissive material encapsulating the light emitting element at an angle larger than the critical angle. This eliminates the need for surface treatments such as plating and vapor deposition for manufacturing the first reflecting mirror, and only needs to adjust the shape of the sealing mold, which significantly shortens the manufacturing process of the LED light. Cost reduction. The side surface of the light transmissive material is part of a spherical surface centered on the light emitting element, so that the side surface is directly transmitted to the side surface and is reflected upward by the second reflecting mirror. As a result, the light emitted from the light emitting element to the upper surface / side surface of the light transmissive material is reflected upward by the second reflecting mirror, so that the LED light having high external emission efficiency while utilizing the thin characteristics of the LED. Becomes

In the above structure, the side surface of the light transmissive material is shaped so that the light totally reflected in the side surface direction is refracted slightly downward.

In this way, the light emitted from the light emitting element is refracted slightly downward on the side surface of the light transmissive material. Therefore, even if the second reflecting mirror around the LED is moved to a lower position, the LED light has high external emission efficiency. As a result, the LED light can be made thinner.

Further, in the above structure, if the third reflecting mirror for reflecting the light emitted to the side of the light emitting element upward is provided around the light emitting element, the LED according to the invention without the third reflecting mirror is provided. In the light, the light is emitted upward only just above the light emitting element, whereas the light is also emitted upward from the periphery of the light emitting element, and it seems that the whole is emitting light, The effect of improving the appearance is obtained.

When the light emitting device is mounted on the circuit board on the metal plate, the light emitting device is mounted on the metal plate having excellent thermal conductivity, so that the heat dissipation is greatly improved and the light emission is improved. Since heat saturation does not occur even when a large current is applied to the device, there is an advantage that a large light output can be obtained. In this way, the LED light is thin and has a large heat dissipation property, a large light output can be obtained without being limited by thermal saturation, and a bright radiant light can be obtained.

Further, since the first reflecting mirror and the second reflecting mirror are formed as an integrated optical body, the structure is simplified and the first reflecting mirror and the second reflecting mirror are formed. Does not cause a positional deviation, and the LED light can surely obtain high external radiation efficiency.

The second reflecting mirror reflects by total reflection, and is provided with an auxiliary reflecting mirror for upwardly reflecting the light that has not been reflected and is transmitted. Since it is not necessary to perform processing such as plating or vapor deposition on the reflecting mirror, and the auxiliary reflecting mirror only reflects the light leaked from the second reflecting mirror, a simple process such as plating coating on the base material. It is possible to fabricate with, and high external radiation efficiency can be obtained. In this way, an LED light with high external radiation efficiency can be obtained by a simple process.

Further, by making the second reflecting mirror have a polygonal shape or a shape close to it when viewed from above, a plurality of polygons having the same shape can be combined without reducing the external radiation efficiency. It is possible to illuminate a range of a certain shape, and it can be applied as an on-vehicle light or the like.

Further, the first reflecting mirror is 6 with respect to the central axis.
By reflecting the light in the range of 0 degree or more, all the light emitted within the range of 60 degrees from the central axis of the upper surface of the light emitting element is reflected in the lateral direction by the first reflecting mirror, and the central axis Light radiated in the range of more than 60 degrees from the side directly goes to the lateral direction, and both are reflected upward by the second reflecting mirror. Therefore, most of the light emitted from the light emitting element is externally emitted, resulting in an LED light with extremely high external emission efficiency.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a light emitting diode according to a first embodiment of the present invention.

FIG. 2 is an enlarged vertical sectional view of a part of the light emitting diode according to the first exemplary embodiment of the present invention.

3 is a graph showing the relationship between the distance h from the upper surface of the light emitting element to the central emitting surface and the increment of the solid angle in the light emitting diode shown in FIG. 2, where (a) is the diameter of the translucent resin being 5 mm. In the case, (b) is 7.5 mm, and (c) is 15 mm.

FIG. 4 is a vertical cross-sectional view showing an example of the shape of the central radiating portion of the light emitting diode according to the first embodiment of the present invention, (a) being a planar shape, (b) being a central radiating surface and a top reflecting surface. Only the boundary part of R has an R shape, (c) the central radiation surface is R
Shaped, (d) concave, (e) convex.

FIG. 5 is a graph illustrating another example of the upper reflecting surface of the light emitting diode according to the first embodiment of the present invention.

FIG. 6 is a vertical sectional view showing another example of the light emitting diode according to the first embodiment of the present invention.

FIG. 7 is a vertical cross-sectional view showing another example of the light emitting diode according to the first embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view showing another example of the light emitting diode according to the first embodiment of the present invention.

FIG. 9 is a cross-sectional view illustrating a transfer molding method which is one method of manufacturing the light emitting diode according to the first embodiment of the present invention.

FIG. 10 is a sectional view illustrating a casting mold method which is one method of manufacturing the light emitting diode according to the first embodiment of the present invention.

FIG. 11A is an L according to the second embodiment of the present invention.
It is a top view which shows the whole structure of ED light, (b) is an AA sectional view of (a), (c) is an enlarged view of P part of (b).

FIG. 12 is a vertical cross-sectional view of an LED that is a light source of an LED light according to a second embodiment of the present invention.

FIG. 13 is a plan view showing a structure in which the periphery of the LED light according to the second embodiment of the present invention is cut into a rectangle and a plurality of the LED lights are combined to cover a certain range.

FIG. 14 is a vertical cross-sectional view showing a first modification of the LED, which is the light source of the LED light according to the second embodiment of the present invention.

FIG. 15 is a vertical cross-sectional view showing a second modification of the LED, which is the light source of the LED light according to the second embodiment of the present invention.

FIG. 16 is an explanatory diagram showing a third modification of the LED, which is the light source of the LED light according to the second embodiment of the present invention.

FIG. 17 is a partial enlarged view showing a fourth modification of the LED light according to the second embodiment of the present invention.

FIG. 18A is an L according to the second embodiment of the present invention
The top view which shows the 5th modification of an ED light, (b) is (a).
BB cross-sectional view of, (c) is a CC cross-sectional view of (a),
(D) is a DD sectional view of (a).

FIG. 19A is an L according to the second embodiment of the present invention
It is a top view showing the 6th modification of an ED light, (b) is an EE sectional view of (a), and (c) is an FF sectional view of (a).

FIG. 20 is a vertical cross-sectional view showing the overall configuration of an LED used in the LED light according to the third embodiment of the present invention.

FIG. 21 is a vertical sectional view showing the overall configuration of an LED light according to a fourth embodiment of the present invention.

FIG. 22 is a vertical sectional view showing the overall configuration of an LED light according to a fifth embodiment of the present invention.

FIG. 23 is a vertical cross-sectional view showing the overall structure of an LED light according to a sixth embodiment of the present invention.

FIG. 24A is an L according to the seventh embodiment of the present invention
FIG. 3B is a plan view showing the overall configuration of the ED light, and FIG. 3B is a sectional view taken along line GG of FIG.

FIG. 25 is a cross-sectional view showing the overall configuration of an example of a conventional LED light.

FIG. 26 shows an example of a conventional LED light, (a)
Is a vertical sectional view centering on a light source, and (b) is a partial perspective view showing a configuration of an LED light.

FIG. 27 shows an example of a conventional LED light, (a)
Is a vertical cross-sectional view centered on the light source, (b) is KK of (a)
It is sectional drawing which shows the whole sectional view structure in a part.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 light emitting element, 4 sealing means (translucent resin), 4a central emitting surface, 4b reflecting surface, 4c side emitting surface, 10 light emitting diode 31, 51, 54, 61, 70, 80, 100, 110
LED lights 33, 53, 56, 71, 89, 104, 113 second
Reflecting mirrors 35a, 35b, 37, 42a, 42b, 43a, 43
b, 63a, 63b, 65, 83, 85, 97, 99
Electric system 3, 64, 84, 98, 115 Light emitting element 38, 66, 86, 102 Light transmissive material 39, 45, 62, 69, 88, 103, 116 First
Reflector 42a, 42b, 43a, 43b Third reflector 45 Metal surface 68, 87, 101, 111 Optical body 81, 95 Metal plate 83, 97 Circuit board 105 Auxiliary mirror

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Toshinori Takahashi             Aichi Prefecture Kasuga-cho, Nishikasugai-gun Ochiai character Nagahata 1             Address Inside Toyota Seisei Co., Ltd. (72) Inventor Hisatoshi Ota             Aichi Prefecture Kasuga-cho, Nishikasugai-gun Ochiai character Nagahata 1             Address Inside Toyota Seisei Co., Ltd. F term (reference) 3K080 AA01 AB01 BA07 BB04 BB20                       BC03 BC10 BC11 BE07                 5F041 AA06 AA47 CA12 DA07 DA17                       DA44 DA57 DA77 DA78 FF11

Claims (19)

[Claims] 1. A light emitting device mounted on a power supply means,
A light-transmitting material sealing means for sealing the light-emitting element, and light emitted from the light-emitting element facing the light-emitting surface side of the light-emitting element is orthogonal to the central axis of the light-emitting element or makes a large angle with the central axis. Light emission characterized by having a reflection surface that reflects in a direction and a side emission surface that emits the light reflected by the reflection surface from the side surface in a direction orthogonal to the central axis of the light emitting element or in a direction forming a large angle with the central axis. diode. 2. The central radiating surface for radiating the light emitted by the light emitting element in a direction substantially parallel to the central axis of the light emitting element, at the center of the reflecting surface. Light emitting diode. 3. The central emitting surface is 0.3 mm to 1.0 mm in the direction of the central axis of the light emitting element from the light emitting surface of the light emitting element.
It is formed in the range of mm.
The light emitting diode described. 4. The light emitting diode according to claim 2, wherein the central emitting surface is smaller than the light emitting area of the light emitting element. 5. The side emission surface emits not only the light reflected by the reflection surface but also the light directly arriving from the light emitting element in a direction orthogonal to the central axis or in a direction forming a large angle with the central axis. The light emitting diode according to any one of claims 1 to 4. 6. An LED light having a reflecting mirror around a light emitting diode, the light emitting diode comprising a light emitting element mounted on a power supply means and a light-transmitting material sealing the light emitting element. A stop means, a reflecting surface facing the light emitting surface of the light emitting element, reflecting a light emitted by the light emitting element in a direction orthogonal to the central axis of the light emitting element or in a direction forming a large angle with the central axis, and reflected by the reflecting surface. An LED light having a side emission surface that emits the emitted light from a side surface in a direction orthogonal to the central axis of the light emitting element or in a direction forming a large angle with the central axis. 7. The central emitting surface for emitting the light emitted by the light emitting element in a direction substantially parallel to the central axis of the light emitting element, in the central portion of the reflecting surface. LED light. 8. The LE according to claim 6, wherein the reflecting mirror is a plurality of substantially flat mirrors.
D light. 9. A light emitting element, a first reflecting mirror which is provided above the light emitting element and which reflects light from the light emitting element in a lateral direction, and radiates upward light reflected by the first reflecting mirror. An LED light having a second reflecting mirror. 10. The LED according to claim 9, wherein a reflecting surface of the second reflecting mirror is divided into a plurality of parts.
Light. 11. The light reflected by the second reflecting mirror is substantially parallel light, as claimed in claim 9 or 10.
The LED light described in. 12. A light emitting element, an electric system for supplying electric power to the light emitting element, the light emitting element and the electric system are sealed,
A light-transmissive material forming a first reflecting mirror that totally reflects light emitted from the light emitting element in a side surface direction on an upper surface of a sealing surface, and a periphery that reflects upward the light totally reflected in the side surface direction. LED light with a reflector. 13. The LED light according to claim 12, wherein the shape of the side surface of the light transmissive material is adjusted so that the light totally reflected in the side surface direction is refracted slightly downward. 14. A third reflecting mirror for reflecting light emitted to the side of the light emitting element upward is provided inside the second reflecting mirror or the peripheral reflecting mirror around the light emitting element. The LED light according to any one of claims 9 to 13, which is characterized. 15. The LED light according to claim 9, wherein the light emitting element is mounted on a circuit board on a metal plate. 16. The one of claim 9 to claim 15, wherein the first reflecting mirror and the second reflecting mirror or the peripheral reflecting mirror are formed in an integrated optical body. LED light described in 3. 17. The second reflection mirror or the peripheral reflection mirror is reflected by total reflection, and an auxiliary reflection mirror for reflecting upward light that has not been reflected and is transmitted is provided. The LED light according to any one of claims 9 to 16. 18. The method according to claim 9, wherein the second reflecting mirror or the peripheral reflecting mirror has a polygonal shape or a shape close to it when viewed from above. LED light. 19. The first reflecting mirror is 6 with respect to a central axis.
The LED light according to any one of claims 9 to 18, which reflects light in a range of 0 degree or more.