JP2002334607A - Led lamp and led luminaire - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve light use efficiency by making parallel projection light of an LED lamp and making an emission angle smaller, and also, to obtain enough luminosity and make easy heat countermeasure in a luminaire mounting LED lamps with high density. SOLUTION: The LED lamp 1 is structured by a reflecting body 3 containing an LED chip 2 inside. The reflecting body 3 is spindle shaped getting bigger toward vertical direction of the light axis, and works same as a reflecting mirror. Light Ba and light Bb outgoing from the LED chip 2 are not reflected at the reflecting body 3 and exit out of the LED chip 2, but light Bc is comes close to parallel with a light axis O by reflection with the reflecting body 3. Reflection is operated many times by making longer the reflecting body on the light axis, so that, outgoing light can be more paralleled with the number of reflection times.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LED lamp for reducing the emission angle of emitted light and improving the light use efficiency, and to improve the luminance by mounting a plurality of LED lamps at a high density. The present invention relates to an LED lighting device that can easily take measures against heat generated when mounted.

[0002]

2. Description of the Related Art Conventionally, a light bulb, a lamp, and a fluorescent lamp have been widely used as a light source for a lighting fixture / equipment, an information display device and the like. However, no matter what light source is used, there are problems in power consumption, luminance, life, color rendering, and the like, and a light source that solves these problems is desired. LED (Light Emitting Diode: Light Emitting Diode)
As e), three primary colors of red, green, blue and light or white are developed and mass-produced, and there are advantages such as longer life of the light source. Therefore, e) is a promising light source for lighting and display devices in the 21st century. The market is expected to expand. In applications such as a lighting device, a backlight of a display device, and a light source, since a single LED lamp does not have sufficient luminance, high-density mounting in which a plurality of LED lamps are arranged is performed. In addition, since it is necessary to display characters and images for display devices, high-density mounting of LED lamps is also performed. In recent years, as for image display devices, the area of the display screen has been increased in recent years, and it has been desired to increase the brightness of LED lamps and improve the characteristics of the radiation angle. On the other hand, miniaturization of the image display device itself is progressing, miniaturization of each component is indispensable, and miniaturization of the light source is also desired.

FIG. 11 shows a conventional LE currently on the market.
It is a schematic sectional drawing which shows D lamp. LED shown in FIG.
The outer shape of the lamp 101 is composed of a slanted cylindrical portion 103 and a convex curved lens portion 104, and is a so-called shell-shaped, formed by a transparent resin sealing body 102 such as epoxy, and a transparent resin sealing body. It has an LED chip 105 and a reflector 106 inside, and has an electrode lead 107 for applying a voltage to the LED chip 105. The reflecting mirror 106 aims at condensing the light emitted from the LED chip 105. The LED chip 105 is a surface light source, and the optical axis O is perpendicular to the surface light source. Such a commercially available LED
The lamp has a maximum diameter of the bullet portion of 3 to 10 mm. In high-density mounting, such an LED lamp 10
Although a large number of 1s are arranged, this size does not lend itself to miniaturization of the apparatus, and there is a problem of measures against heat generated.

In the conventional LED lamp 101 shown in FIG. 11, with respect to the light emitted from the LED chip 105, the light emitted parallel to the optical axis O proceeds in parallel as it is,
The light emitted obliquely from the optical axis O is emitted at the same angle, while the light emitted obliquely from the optical axis O is reflected by the reflecting mirror 10.
At 6, the light is reflected so that the inclination becomes small. These lights are
The light passes through the cylindrical portion 103 of the LED lamp 101 or is reflected on the side wall, and is finally condensed by the convexly curved lens portion 104 of the LED lamp and collected in the direction of the optical axis O. However, not all light emitted from the LED chip 105 can be collected. To improve light utilization efficiency, LE
It is necessary to collect the light emitted from the D chip 105 in the narrowest possible angle range, that is, to reduce the radiation angle, and it is important to collimate the emitted light.

As means for reducing the emission angle of the light emitted from the LED lamp 101, making it parallel, and improving the light use efficiency,
There is a technique for optimally designing the shape of the resin sealing body 102 of the LED lamp 101. For example, JP-A-11-46
In the LED lamp disclosed in Japanese Patent No. 013, the shape of the lens portion is changed to an elliptical curved surface (formula: X ² /2.4 ² + y ² /3.0 ² =
1), indicating that this shape is appropriate. In addition, it is shown that the distance from the tip of the convex curved lens portion of the LED chip to the LED lamp is also an important factor for high light use efficiency, and that this distance has an optimal range. . However, the number of parameters representing the shape of the lens portion of the LED lamp is limited, and the distance between the lens portion and the LED chip has an optimum value, but there is a limit. There is a limit in improving the emission light characteristics.

[0006] The shape design of the reflecting mirror is also effective for light collection. Japanese Patent Laid-Open Publication No. Hei 10-31213 discloses a light source device that uses a conical reflecting mirror having a 90-degree apex angle and an optical element such as a lens to collect light emitted from a light source in the reflecting mirror and emit the light as parallel light. It is shown. The purpose of this light source device is to emit light with good parallelism without unevenness in light quantity, and it has been shown that this light source device is effective. However, in this light source device, since the light emitted from the light source cannot be parallelized only by the reflecting mirror, an optical element for condensing light such as a lens is provided in front of the mirror. Increasing the number of parts in the optical system requires not only the design of the reflector but also the design of a lens suitable for the reflector, and the necessity of adjusting the reflector and the lens. Problems arise.
For this reason, it is desirable that the light emitted from the light source be collimated only by the reflecting mirror.

Further, when LED lamps are mounted at high density, heat is generated, so that this measure must be taken. For this purpose, a general method is to exhaust the generated heat from the apparatus using a fan or the like. However, this requires a separate fan to be integrated into the device,
There is a problem that the device becomes large.

[0008] With the downsizing of the illuminating device, the LED lamp itself to be mounted at a high density must be downsized.
It is desired to reduce the size of the device by improving the shape of the ED lamp itself and the arrangement method.

[0009]

SUMMARY OF THE INVENTION The present invention has been made in view of the problems of the above-described conventional device. When an LED lamp is used as a light source of a lighting device, light emitted from an LED chip is more parallelized. To keep the radiation angle small,
Provided is an LED lamp and an LED lighting device that improve light use efficiency by collecting a large amount of light within this small radiation angle, and facilitate heat measures even in a lighting device in which a plurality of LED lamps are mounted at high density. That is a general task.

An object of the present invention is to provide an LED lamp body having a plurality of reflections by using a plurality of reflections.
An object of the present invention is to provide an LED lamp capable of reducing the angle of emission and collimating emitted light and reducing the size of a device using the LED lamp.

An object of the present invention is to improve the energy reflectance of the reflector by the material of the reflector, to improve the light use efficiency, and to reduce the size of the apparatus using the LED lamp. It is to provide.

It is an object of the present invention to provide an LED lamp in which an end of the LED lamp is formed flat to facilitate processing.

An object of the present invention is to provide an LED lamp in which the end of the LED lamp is formed as a convexly curved condensing lens so that the emission angle of the emitted light can be further reduced and parallelized. To provide.

An object of the present invention is to provide a light source for an LED lighting device, in which the brightness of the LED lighting device is sufficiently increased and a measure against heat generated when the LED lamp is mounted at a high density is easy. It is to provide a simple LED lighting device.

An object of the invention of claim 6 is to provide an LED lighting device that can be mounted at a higher density because the shape of the LED lamps arranged at a high density in the direction perpendicular to the optical axis is a curved surface.

An object of the present invention is to provide an LED lighting device which can be mounted at a higher density because the LED lamps arranged at a high density have a polygonal shape in the direction perpendicular to the optical axis. is there.

[0017]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above-mentioned object, and the invention of claim 1 is directed to an LED.
In an LED lamp including a chip and a reflector that reflects light emitted from the LED chip, the reflector is partially or entirely in a cone shape.

[0018] The invention of claim 2 is an LE of the invention of claim 1.
In the D lamp, the reflector is formed of a transparent member or a reflection member.

According to a third aspect of the present invention, in the LED lamp according to the first or second aspect, the light emitting side end of the LED lamp has a planar shape.

According to a fourth aspect of the present invention, in the LED lamp according to the first or second aspect of the present invention, the light emitting side end of the LED lamp has a convex curved shape.

According to a fifth aspect of the present invention, there is provided an LED lighting apparatus in which a plurality of the LED lamps according to the first to fourth aspects of the present invention are arranged.

The invention of claim 6 is the LE of the invention of claim 5.
In the D illumination device, the LED lamp has a curved cross section in a direction perpendicular to an optical axis.

The invention of claim 7 is the LE of the invention of claim 5.
In the D lighting device, a sectional shape of the LED lamp in a direction perpendicular to an optical axis is a polygon.

[0024]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described based on Examples shown in FIGS. (Explanation of Claim 1) FIG. 1 is a sectional view schematically showing an LED lamp according to an embodiment of the present invention. The LED lamp 1 includes a reflector 3 including an LED chip 2 therein. The reflector 3 has a pyramid shape whose size in the direction perpendicular to the optical axis gradually increases along the optical axis O of the reflector 3, which is compared with the conventional shell-type LED lamp 101 shown in FIG. At this time, from the viewpoint of reflection of light emitted from the LED chip 2, it has the same function as the reflecting mirror 106 of the conventional LED lamp 101 shown in FIG. Light B emitted from the LED chip 2 and emitted in parallel with the optical axis O
a, and the light Bb emitted at a small angle with respect to the optical axis O is not reflected by the reflector 3 and is emitted outside the LED lamp at the angle emitted from the LED chip 2. The light Bc emitted from the LED chip 2 is reflected by the reflector 3
Is brought close to being parallel to the optical axis O. Here, by lengthening the reflector 3 on the optical axis in the optical axis direction, reflection is performed many times, and even if the light is emitted at a large angle with respect to the optical axis O at first, it becomes more parallel according to the number of reflections. And emitted.

FIG. 2 is a partial sectional view showing a part of an LED lamp having a reflector formed of a transparent material. When the light emitted from the LED chip 2 into the reflector 3, that is, the transparent material, is reflected by the outer peripheral surface of the reflector 3,
When the incident angle α of the emitted light Bd from the LED chip 2 with respect to the outer peripheral surface of the reflector 3 increases, the energy reflectivity increases, and when resin is used as the transparent material, the maximum is 100.
%, Ie, total reflection. Increasing the length of the reflector on the optical axis increases the area that satisfies the angle for improving the energy reflectivity for the emitted light,
This leads to improvement in light use efficiency as a whole.

(Explanation of claim 2) L of claim 2 of the present invention
Regarding the reflector member in the ED lamp, the transparent member means a resin such as epoxy or polycarbonate, or a substance such as glass or a mineral, and the reflector member means a metal such as gold, silver or aluminum and a reflection member such as a dielectric. Means a substance having a specific rate.

FIG. 3 is a sectional view showing an LED lamp in which the reflector 3 shown in FIG. 2 is formed from two parts. When the material of the reflector 3 is a metal such as aluminum, FIG.
The reflector shown in FIG. 3 may be composed of only one portion, but when the material is a transparent member such as resin, FIG.
It is desirable that the reflector is composed of two parts, a first reflector 3a and a second reflector 3b, as shown in FIG.
This is because, in the case of resin, the LED chip 2
This is because light emitted from the light emitted from the optical axis O with a large inclination is transmitted without being reflected, which leads to a decrease in light use efficiency as a whole.

FIG. 4 is a sectional view showing an LED lamp in which the material of the reflector 3 shown in FIG. 1 is formed of metal. When metal is used for the reflector, as shown in FIG.
An example is a structure in which the outer edge 3c of the reflector 3 is made of metal and the inside 3d is filled with resin. This is realized by a method in which a resin is filled in a metal cup-shaped metal reflection portion, or a metal is vacuum-deposited around the resin. Further, in FIG. 3, a part of the reflector (first reflector 3a) may be made of metal, and the other part (second reflector 3b) may be made of resin. The number of reflectors may be two or more.

Next, ray tracing calculation was performed for the case where the reflector was a resin. In the LED lamp having the shape shown in FIG. 3, the shape in the direction perpendicular to the optical axis is made conical, and the first reflector 3a
Is a cone having a bottom diameter of 1 mm (L2 in FIG. 3) and a height perpendicular to the bottom surface of 0.6 mm, these values are fixed, and the second reflector 3b has a diameter of the bottom surface 11 of 3 mm (L1 in FIG. 3), the diameter of the bottom surface 12 on the opposite side is 1 mm (L2 in FIG. 3), and the length of the second reflector 3b on the optical axis (L3 in FIG. 3) is 5 mm and 10 mm. , 15m
The ray tracing calculation was performed by changing m and 20 mm. Here, the value that the diameter L1 of the bottom surface 11 is 3 mm substantially corresponds to the diameter of a small, commercially available bullet-type LED lamp. The size of the LED chip 2 as a light source is 200 ×
The surface light source was assumed to be 200 μm, and was located at a position 0.3 mm in length along the optical axis from the bottom surface 12 of the cone of the first reflector 3a. In this ray tracing calculation, the first and second reflectors 3a, 3
The material of b was polycarbonate, but the material of the resin is not limited to this.

FIG. 5 is a graph showing the relationship between the intensity and the radiation angle on a spherical light receiver installed in the far field obtained by the ray tracing calculation. Although the relative luminous intensity is used in FIG. 5, in the ray tracing calculation, the horizontal axis represents the emission angle (degree) of the emitted light, and the vertical axis represents the luminous intensity of the emitted light (watt / solid angle: W / S).
A graph representing r) was obtained. To find the half-value angle,
In FIG. 5, assuming that the point P having the highest intensity is 1.0, the half value angle θ, which is the radiation angle of the half value 0.5, is read.
This value represents the emission angle of the emitted light, and was defined as the divergence angle. It can be said that the smaller the value θ is, the lower the emission light angle is.

Table 1 is a table showing the above calculation results.
Of these values, the length on the optical axis of the LED lamp is 5 m
The value of m is the best. These values were compared with those of a commercially available LED lamp that has a relatively good radiation angle characteristic. The values of the half-value angle of the commercially available LED lamps are 9.5 degrees (calculated from the published data of NSPB500S of the LED lamp manufactured by Nichia Corporation, the lamp diameter is 5.0 mm), and 7.3 degrees (also Nichia Chemical Corporation). (Calculated from the published data of NSPB300A, an LED lamp manufactured by Kogyo Co., Ltd., lamp diameter is 5.0 mm.) Among the values obtained this time, there are some smaller than those of these commercial LED lamps, and the characteristics of the radiation angle are improved. You can see that it is doing.

[0032]

[Table 1]

Next, Table 2 shows that each numerical value of the first reflector 3a is the same as the above, and the length on the optical axis of the second reflector 3b is 5
It is a table | surface which shows the result of performing ray tracing calculation by fixing with mm and changing the diameter of a bottom surface to 2 mm, 3 mm, and 4 mm. Each value is equal to or less than that of the above-mentioned commercially available LED lamp, and even if the diameter of the bottom surface is different, it is effective in reducing the emission angle and parallelizing the emitted light. The diameter of the bottom is 2m
If it is m, it is smaller than a commercially available one, so that the size of the lighting device can be reduced.

[0034]

[Table 2]

The critical angle ic according to the first aspect of the present invention is obtained by the following equation (1): sin ic = (n / n ′) (1) where ic is the incident angle (in FIG. 2, the angle α). ) Where n is the refractive index of the reflector and n ′ is the refractive index of air (= 1)
It is. Examples of the transparent member used for optical applications include glass, resin, and mineral. For example, there are many types of resins, and the refractive index of many of them is 1.3 to 1.
Between eight. In FIG. 2, when the incident angle α, that is, the critical angle ic is determined from these refractive indices, it is 5 at a refractive index of 1.3.
0.3 degrees and a refractive index of 1.8 give 33.8 degrees. If the incident angle α is equal to or more than these values, total reflection occurs and the energy reflectance becomes 100%. Parameters such as the length of the reflector 3 on the optical axis and the length in the direction perpendicular to the optical axis are optimized and designed so that the energy reflectance approaches 100% and the area thereof is maximized.

Next, ray tracing calculation was performed with a structure using metal for the reflector 3 as shown in FIG. At this time, the bottom 1
3 has a diameter (L4 in FIG. 4) of 3 mm, the diameter of the opposite bottom surface 14 (L5 in FIG. 4) is 1 mm, and the length on the optical axis (L6 in FIG. 4) is 5 mm. Aluminum was used as the metal and polycarbonate was used for the inside 3d, but the material of both metal and resin is not limited to this. Here, the normal incidence reflectance of aluminum is 90%.
However, this value indicates that the spectral reflectance when aluminum is vacuum-deposited is 91.6% (chemical chronology, edited by the National Astronomical Observatory of Japan).
Is an appropriate value.

As a result of the ray tracing calculation, this radiation angle is 8 degrees, and the characteristics of the radiation angle are good. However, the luminous flux utilization efficiency was reduced to 84%, compared to almost 100% for the calculation result of the above-described reflection portion made of only the resin. This is due to the reflectivity of aluminum.
When the incident angle of the light emitted from the LED chip 2 to the reflecting portion is very small, the reflectance approaches 100%, but the reflectance decreases as the incident angle increases. For this reason, even if the reflectance at normal incidence is 90%, if the reflection is repeated three times, the reflectance is reduced to the cube of 0.90, that is, 73%. Therefore, the overall light use efficiency decreases. There is an upper limit of processing accuracy to improve the reflectance.
The higher the precision, the higher the cost, but the reflectance is preferably 85% or more. For this reason, if there is no restriction on the production, it is preferable to use it as a reflection portion made of resin alone. In a commercially available shell-type LED lamp, the reflector may have the shape described above, and in the example shown in FIG. 3, the reflector is a reflector having a shape used in a commercially available LED lamp. It does not matter. LE
The D chip may be organic or inorganic.

(Explanation of Claim 3) FIG.
1 is an external perspective view illustrating an embodiment of an ED lamp. Among the commercially available LED lamps, the bullet type has relatively good emission angle characteristics because its tip has a convex curved shape and functions as a condenser lens. However, the LED of the invention of claim 3
Like the lamp 1, even if the body end is formed on the flat surface 15,
As already mentioned in the embodiment of claim 1 of the present invention,
By the time the light emitted from the chip is emitted from the LED lamp, most of the emitted light is parallelized and reduced in radiation angle by multiple reflections, so that there is a sufficient effect. Further, by forming such a flat surface, there is an advantage that processing is easier than providing a convex curved surface portion such as a lens in this portion. This is a commercially available bullet type LED 1 shown in FIG.
It can also be considered that the cylindrical portion 103 and the lens portion 104 are removed from 01.

(Explanation of Claim 4) FIG.
1 is an external perspective view illustrating an embodiment of an ED lamp. Making the tip of the LED lamp 1 a convex curved surface 16 has the function of a condensing lens, and makes the emitted light more light than when this part is flat.
This is to further parallelize and lower the radiation angle. Claim 1
Ray tracing calculations were performed on the two examples described for the invention with a structure in which the tip had a convex curved surface and had a lens effect. One has a length of 5.0 mm on the optical axis and two bottom diameters of 3 mm and 1 mm, and the other has a length of 5.0 mm on the optical axis and two bottom diameters of 2 mm and 1 mm. is there. As a result of the ray tracing calculation, no effect was observed for the former regarding the half-value angle, but for the latter, 12.6 degrees was reduced to 11.6 degrees, and the radiation angle characteristics were improved. For this reason, the effect is small when the reflection portion alone has sufficiently good radiation angle characteristics, but the lens effect is obtained when the reflection angle characteristics are poor.

(Explanation of Claim 5) FIG. 8 is an external perspective view showing an LED lighting device according to the invention of claim 5 in which LED lamps are mounted at a high density. The optical axes O, O,... Of the LED lamps 1, 1,. In FIG. 8, the shape of each LED lamp 1 in the direction perpendicular to the optical axis O is circular, but the shape is not limited to this. LED lamps 1,
By arranging 1,... And mounting them at high density, the brightness is improved by that much. However, the LED chips 1,
When light is emitted from the LED lamps, heat is generated. However, when commercially available bullet-shaped LED lamps are mounted at a high density, there is only a small gap between the LED lamps due to the circular shape of the LED lamps. It is difficult to escape and the structure is easy to store heat. For this reason, when commercially available LED lamps are mounted at high density, it is necessary to release heat by increasing the gap between the LED lamps or installing a forced cooling device such as a fan. Increasing the gap leads to an increase in the size of the device, and installing a fan requires a correspondingly large space, which leads to an increase in the size of the device. In contrast, the LE of the present invention
In the LED lamps 1, 1,...
Because of the inclined shape, even if the LED lamps are densely arranged in front of the optical axis, the gap 18 increases behind the optical axis, that is, near the LED chip. This makes it easy for heat to escape,
It turns out that it is advantageous in heat measures. In addition, even if heat is generated to the extent that some kind of heat countermeasure device is required, the size of the device can be reduced due to the presence of the gap. In this case, for example, a heat radiating device such as a heat sink can be installed in the gap.

FIG. 9 shows a plurality of LEDs.
FIG. 3 is a rear view of the LED lighting device configured by mounting the lamps at high density, as viewed from the optical axis direction. In the LED lighting device 17 according to the sixth aspect, the cross-sectional shape of the LED lamp 1 in the direction perpendicular to the optical axis is curved, so that high-density mounting is achieved. For example, as shown in a rear view seen from the optical axis direction shown in FIG. 9, if the cross-sectional shape is a curved surface, the columns or rows can be arranged in a shifted state, and the filling rate can be increased. In FIG. 9, reference numeral 19 denotes a bottom surface of the reflection unit viewed from the optical axis direction, and reference numeral 2 denotes an LED chip viewed from the optical axis direction.

(Explanation of Claim 7) FIG. 10 shows an LED lamp having a rectangular cross section in the direction perpendicular to the optical axis of an LED lamp.
It is an external appearance perspective view which shows the LED lighting device which comprised the lamp with high density mounting. The LED lighting device 17 of claim 7 is
By making the cross-sectional shape of each of the LED lamps 1, 1,... In the direction perpendicular to the optical axis into a polygon, high-density mounting without gaps at the LED lamp ends is enabled. As shown in FIG. 10, for example, when the polygon is a quadrangle, there is an advantage that filling can be performed without a gap at the end in the optical axis direction.

[0043]

As is apparent from the above description, the present invention has the following effects. The invention of claim 1 is
When an LED lamp is used as a light source for a lighting device, the inclined reflector using total reflection is used to solve the problems of lowering and parallelizing the emitted light, improving the light use efficiency, and reducing the size of the device. , The emission angle can be reduced and the output light can be collimated, which can improve the light use efficiency.
LE that can reduce the size of equipment using D lamps
A D lamp can be provided.

According to a second aspect of the present invention, when an LED lamp is used as a light source for a lighting device, the emission light can be reduced in emission angle and parallelized by the shape of the inclined reflector utilizing total reflection. For this reason, it is expected that the light use efficiency will be improved.
L that can reduce the size of an apparatus using an ED lamp
An ED lamp can be provided.

According to the third aspect of the present invention, it is possible to provide an LED lamp which can be easily processed because the end of the LED lamp is flat.

The fourth aspect of the present invention can provide an LED lamp that can further reduce the emission angle and parallelize the emitted light because the end of the LED lamp is a convex lens.

According to a fifth aspect of the present invention, when an LED lamp is used as a light source of a light source device for illumination, a sufficient luminance can be obtained because the structure of the LED lamp itself is suitable for high-density mounting. Even when mounted, a gap is created between the LED chips, making it easy to take measures against heat
A lighting device can be provided.

According to the invention of claim 6, since the shape of the LED lamp in the direction perpendicular to the optical axis is a curved surface, high-density mounting is possible and sufficient luminance is obtained. Can be provided easily.

According to the seventh aspect of the present invention, since the shape of the LED lamp in the direction perpendicular to the optical axis is polygonal, further high-density mounting is possible and sufficient luminance is obtained, and a gap is generated between the LED chips. LE that can easily take heat countermeasures
A D lighting device can be provided.

[Brief description of the drawings]

FIG. 1 is a schematic sectional view showing an embodiment of the LED lamp of claim 1;

FIG. 2 is a partial cross-sectional view showing an embodiment of an LED lamp in which a reflector is formed of a transparent material.

FIG. 3 is a sectional view showing an LED lamp in which a reflector is formed from two parts.

FIG. 4 is a cross-sectional view showing an LED lamp in which a reflector is formed of metal.

FIG. 5 is a graph showing the relationship between the intensity of emitted light from an LED lamp and the angle of radiation obtained by ray tracing calculation.

FIG. 6 is an external perspective view showing an embodiment of the LED lamp of claim 3;

FIG. 7 is an external perspective view showing an embodiment of the LED lamp of claim 4;

FIG. 8 is an external perspective view showing an embodiment of the LED lighting device according to claims 5 and 6;

FIG. 9 is a rear view of the LED lighting device shown in FIG. 8 as viewed from an optical axis direction.

FIG. 10 is an external perspective view showing an embodiment of the LED lighting device according to claim 7;

FIG. 11 is a schematic sectional view showing a conventional LED lamp.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... LED lamp, 2 ... LED chip, 3 ... Reflector, 3
a: first reflector, 3b: second reflector, 3c: outer edge, 3d: inside, 17: LED lighting device, 18: gap,
O: optical axis, Ba, Bb, Bc, Bd: outgoing light.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // F21Y 101: 02 F21S 1/00 E (72) Inventor Ikuo Kato 1-3-3 Nakamagome, Ota-ku, Tokyo No. 6 Inside Ricoh Company (72) Inventor Kenji Kameyama 1-3-6 Nakamagome, Ota-ku, Tokyo Stock Company Ricoh Company (72) Yasuyuki Takiguchi 1-3-6 Nakamagome, Ota-ku, Tokyo Stock F term in Ricoh Company (reference) 5F041 AA33 DA13 DA78 EE23 FF11

Claims (7)

[Claims] 1. An LED lamp comprising an LED chip and a reflector for reflecting light emitted from the LED chip, wherein the reflector is partially or wholly cone-shaped. 2. The LED lamp according to claim 1, wherein
The said reflector is a transparent member or a reflective member, The LED lamp characterized by the above-mentioned. 3. The LED lamp according to claim 1, wherein a light emitting side end of the LED lamp has a planar shape. 4. The LED lamp according to claim 1, wherein a light emitting side end of the LED lamp has a convex curved shape. 5. An LED lighting apparatus comprising a plurality of the LED lamps according to claim 1. 6. The LED lighting device according to claim 5, wherein a cross-sectional shape of the LED lamp in a direction perpendicular to an optical axis is a curved surface. 7. The LED lighting device according to claim 5, wherein a cross-sectional shape of the LED lamp in a direction perpendicular to an optical axis is a polygon.