JP3184561U - Light emitting diode lamp - Google Patents

Abstract

An LED lamp capable of obtaining illumination with uniform brightness without increasing the number of LEDs.
A circuit board is attached to the inside of a base, and a plurality of light emitting diodes are electrically connected to the circuit board and provided in an annular shape with a predetermined interval. The light guide cover 5 is made of a light-transmitting material, and is formed in an annular shape corresponding to the light emitting diode so as to cover the light emitting diode and allow light from the light emitting diode to enter, and is opened toward the base 2 side. It has a lower end 51 and an upper end 52 extending upright from the lower end 51 in the opposite direction to the circuit board 3. The reflective layer 6 is provided in contact with the inner peripheral surface of the light guide cover 5 so as to reflect the light from the light emitting diode.
[Selection] Figure 1

Description

  The present invention relates to a light emitting diode (LED) lamp.

  In recent years, LEDs have excellent features such as small size, long life, low power consumption, high-speed response, etc. compared with conventional incandescent lamps, halogen lamps, etc. It is being put into practical use as an illumination light source such as a headlight. Since the LED is a point light source, when used as a light source for conventional illumination, the luminous flux per piece is weak, so a large amount of light is secured by mounting a plurality of LED elements in one package. Moreover, since the LED which is a point light source has high brightness and gives an unpleasant feeling to a person, a design that enables diffusion of the light source is required. As a conventional example of this type, there is one disclosed in Patent Document 1, for example. This includes a base having a housing space, a plurality of LEDs disposed inside the base, at least one refractive layer disposed between the plurality of LEDs, and opposed to both sides of the refractive layer. It has a reflective layer and a translucent layer that transmits the light beam of the LED at the periphery of the accommodation space of the base.

Taiwan registered utility model No. M379707 specification

  In the conventional LED lamp, the light from the LED is refracted by the refractive layer and projected to the outside, and the light from the LED is reflected by the reflective layer in the same direction as the direction in which the refractive layer refracts the light. The range can be expanded into a long rectangular shape, and the illumination brightness of the lamp can be increased. However, since the luminous flux of the LED is small and the irradiation angle as illumination is limited, there is a problem in that it is not possible to illuminate uniformly depending on the arrangement location of the LED and uneven brightness occurs. In addition, the light from the LED is reflected by the reflective layer in the same direction as the direction in which the refractive layer refracts the light, so that the amount of emitted light in that direction can be increased, but the light from the lamp is uniformly irradiated. There are also problems that cannot be expanded. Such a problem can be solved by increasing the number of installed LEDs. However, increasing the number of installed LEDs increases the cost of the apparatus, increases the power consumption, and increases the amount of heat generated. Another problem is raised.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an LED lamp capable of achieving illumination with uniform brightness without increasing the number of LEDs.

  In order to achieve the above object, an LED lamp according to the present invention is electrically connected to a base defining an accommodation space, a circuit board having a driving circuit attached to the inside of the base, and the circuit board. A light-emitting module having a plurality of light-emitting diodes arranged in a ring at predetermined intervals, and a light-transmitting material, and the light from the light-emitting diodes is incident on the light-emitting diodes A lower end portion that is formed in an annular shape corresponding to the light emitting diode and that is open toward the base side, and an upper end portion that extends from the lower end portion in an upright direction opposite to the circuit board. And a reflective layer provided in contact with an inner peripheral surface of the light guide cover so as to reflect light from the light emitting diode.

  According to the present invention, light from a plurality of LEDs passes through the light guide cover from the lower side of the light guide cover and is scattered and reflected by the reflective layer provided in contact with the inner peripheral surface of the light guide cover. Therefore, illumination light having a wide range can be obtained. Therefore, it is possible to obtain light emission that uniformly illuminates one surface without increasing the number of LEDs, and it is possible to minimize heat generation by the LEDs.

It is a longitudinal cross-sectional view which shows schematically the structure of the LED lamp by Example 1 of this invention. It is a decomposition | disassembly longitudinal cross-sectional view which shows a light guide cover and a reflection layer. It is an assembly longitudinal cross-sectional view which assembles and shows a light guide cover and a reflective layer. FIG. 4 is a bottom view of FIG. 3. It is a top view which shows the circuit board by which LED is arrange | positioned. It is a longitudinal cross-sectional view which shows schematically the modification of the LED lamp which concerns on Example 1. FIG. It is a longitudinal cross-sectional view which shows schematically the modification of the LED lamp which concerns on Example 1. FIG. It is a decomposition | disassembly longitudinal cross-sectional view which decomposes | disassembles and shows a base, a light guide cover, and a reflection layer in the modification of the LED lamp which concerns on Example 1. FIG. It is an assembly longitudinal cross-sectional view of the base of FIG. 8, a light guide cover, and a reflective layer. It is a longitudinal cross-sectional view which shows schematically the structure of the LED lamp by Example 2 of this invention. It is a decomposition | disassembly longitudinal cross-sectional view which shows the reflection layer and light guide cover in Example 2. FIG. It is a bottom view which shows the state by which the light guide cover and reflection layer of FIG. 11 were assembled.

  The above-described object, other objects, features, and advantages of the present invention will become more apparent from the following description of embodiments for carrying out the present invention with reference to the drawings.

Example 1
FIG. 1 shows the configuration of an LED lamp according to a first embodiment of the present invention. As shown in FIG. 1, the LED lamp includes a base 2, a circuit board 3, a light emitting module 4, a light guide cover 5, and a reflective layer 6.

  The base 2 is a hollow frame defining an accommodation space, and a base is detachably provided on the lower side of the base 2. In this example, the inner peripheral surface of the base 2 is provided with a circumferential groove formed in a ring shape. The circuit board 3 has an LED drive circuit formed in advance, and is arranged inside the base 2.

  The light emitting module 4 includes a plurality of LEDs 41 that are electrically connected to the circuit board 3, and the LEDs 41 are provided in, for example, an annular shape at predetermined intervals as shown in FIGS. 1 and 5. It has been.

  The light guide cover 5 may be made of a colored material that is translucent and colored. In this example, the light guide cover 5 is colorless and translucent. The light guide cover 5 is provided to be fixed to the base 2 so as to cover the LED 41 while the light emission of the light emitting module 4 is directed according to the LED 41. In this example, the light guide cover 5 includes a lower end 51 fitted inside the base 2 and an upper end 52 formed upright from the lower end 51, as shown in FIG. It is made up of.

  In this example, the light guide cover 5 is a hollow housing with the lower end 51 opened, and an annular collar that fits with the peripheral groove of the base 2 is formed on the outer surface of the lower end 51, An annular shoulder is formed in the side surface. The light guide cover 5 preferably has at least an upper end portion 52 formed in a curved surface shape. For example, the light guide cover 5 has a shell shape in which the lower end portion 51 is opened and the upper end portion 52 is closed, or the lower end portion. 6 may have a reverse ridge shape as shown in FIG. 6 or a dome shape with a depth as shown in FIG.

  The reflective layer 6 is provided on the inner peripheral surface of the light guide cover 5 so as to reflect the light emitted from the LED 41. In this example, as shown in FIGS. 1, 3, and 4, the bottom portion of the reflective layer 6 does not contact the annular shoulder portion of the light guide cover 5, and the slot for accommodating the LED 41 by the light guide cover 5. 7 is formed.

  The slot 7 is formed by an annular shoulder formed in the light guide cover 5 and the reflective layer 6 as shown in FIGS. 9 to 9, the light guide cover 5 may be formed by the base 2, the light guide cover 5, and the reflective layer 6 so as to be separated from the circuit board 3 and ride on the LED 41.

  In addition, the light guide cover 5 and the base 2 are connected by fitting the collar formed on the lower end 51 and the circumferential groove formed on the base 2 in order to enhance the sealing performance between them. As shown in FIGS. 6, 7, and 9, the light guide cover 5 configured such that the lower end portion 51 has an outer diameter slightly larger than the inner diameter of the base 2 is inserted into the base 2. Thus, the lower end portion 51 may push the base 2 and make the two fit tightly.

  In this example, the reflective layer 6 is white made of a plastic material, but is not limited to this as long as it reflects light, and may be made of other materials or other colors.

  In the LED lamp configured as described above, the light from the LED 41 is incident from the lower end portion 51 of the light-transmitting light guide cover 5 and emitted while passing through the light guide cover 5. The light is scattered and emitted while being reflected by the reflective layer 6 attached to the peripheral surface. That is, the light from the LED 41 can be emitted while spreading from the lower end 51 to the upper end 52 side. As a result, the light emitted from the LED 41, which is a point light source, can be changed to light emitted uniformly by spreading over one surface. Therefore, it is possible to obtain an LED lamp that can be illuminated uniformly and can eliminate discomfort by concentrating on a part of the light.

  In addition, according to the LED lamp according to the present invention, it is possible to illuminate uniformly without uneven brightness, so that it is not necessary to increase the number of LEDs, and the heat generation of the lamp does not increase. As a result, the device for dissipating heat from the LED lamp does not need to be enlarged.

  The LED lamp according to the present invention can be applied in the same manner as incandescent bulbs and fluorescent lamps as footlights and indirect lighting without being restricted by the size and color of the light guide cover and the case itself.

(Example 2)
FIG. 10 shows a configuration of an LED lamp according to the second embodiment of the present invention. Since the configuration is basically the same as that of the LED lamp of FIG. 1, the description of the overlapping parts is omitted here.

  In this example, the light guide cover 5 is a hollow cylindrical body having a lower end portion 51 and an upper end portion 52 opened, and having a large diameter from the lower end portion 51 to the upper end portion 52 side. A plurality of recesses 511 for positioning and accommodating the LED 41 are formed at predetermined intervals.

  The reflective layer 6 is in contact with the bottom 63 arranged opposite to the circuit board 3 and the inner peripheral surface so as to extend along the inner peripheral surface of the light guide cover 5, and stands upright from the periphery of the bottom 63. The reflecting portion 61 is formed by being extended, and an annular flange portion 62 that protrudes outward from the periphery of the upper end of the reflecting portion 61 so as to be bent at a substantially right angle and extends over the upper end portion. In this example, the reflective layer 6 is a bottomed cylindrical body having a diameter increasing from the bottom 63 to the flange 62 side. In this example, the base of the LED lamp, the circuit board 3 and the reflective layer 6 are connected by a fixing member such as a nail or a bolt, and the bottom 63 of the reflective layer 6 is directed upward from the bottom surface. A recess is provided with a connecting hole.

  The light guide cover 5 is colorless and transparent as in the above embodiment. However, the light guide cover 5 may be made of a coloring material in order to obtain a colored illumination by transmitting the light from the LED 41 through the light guide cover 5. .

  The reflective layer 6 is white made of a plastic material as in the above embodiment, but is not limited to this as long as it reflects light, and may be other materials or other colors.

  In the LED lamp configured as described above, the light from the LED 41 is incident from the lower end portion 51 of the light-transmitting light guide cover 5 and emitted while passing through the light guide cover 5. The light is scattered and emitted while being reflected by the reflective layer 6 attached to the peripheral surface. That is, the light from the LED 41 can be emitted while spreading from the lower end 51 to the upper end 52 side. In addition, since the light incident on the light guide cover 5 hits the flange portion 62 and is reflected, the light emitted from the LED 41 that is a point light source can be further spread and radiated uniformly. Therefore, it is possible to obtain an LED lamp that can be illuminated uniformly and that can eliminate discomfort by illuminating part of the illumination.

  As described above, in the LED lamp according to the present invention, the light from the plurality of LEDs 41 passes through the light guide cover 5 from the lower end surface of the lower end portion 51 and is scattered by the reflecting layer 6 that increases in diameter from the lower side toward the upper side. Therefore, illumination light having a wide range can be obtained. Therefore, it is possible to obtain light that uniformly illuminates the entire surface without increasing the number of LEDs 41, and it is possible to minimize the heat generated by the LEDs 41.

  As described above, several embodiments of the present invention have been described with reference to the drawings. However, the present invention is not limited to the illustrated embodiments. Various modifications can be made to the illustrated embodiment within the same range as the present invention or within an equivalent range.

  The LED lamp according to the present invention is useful for LED lamps that illuminate uniformly on one surface because the number of LEDs to be mounted, the number of mounting steps, and the manufacturing cost are reduced.

2 Base 3 Circuit board 4 Light emitting module 41 LED
5 Light guide cover 51 Lower end portion 511 Recessed portion 52 Upper end portion 6 Reflective layer 61 Reflective portion 62 Flange portion 63 Bottom portion 7 Slot

Claims (14)

A base that defines the containment space;
A circuit board having a drive circuit mounted inside the base;
A light-emitting module having a plurality of light-emitting diodes which are electrically connected to the circuit board and provided in a ring shape at a predetermined interval;
It is made of a light-transmitting material, and is formed in an annular shape corresponding to the light emitting diode so as to cover the light emitting diode and allow light from the light emitting diode to enter and toward the base side A light guide cover having an open lower end portion and an upper end portion extending upright from the lower end portion in an opposite direction to the circuit board;
A light emitting diode lamp, comprising: a reflective layer provided in contact with an inner peripheral surface of the light guide cover so as to reflect light from the light emitting diode.   The light emitting diode lamp according to claim 1, wherein the upper end portion is closed. The upper end is formed in a curved surface,
The light emitting diode lamp according to claim 2, wherein the lower end portion is provided in contact with the base.   The light-emitting diode lamp according to claim 3, wherein the light guide cover is formed in a dome shape having a small diameter from the lower end portion toward the upper end portion. In the lower end portion, a shoulder portion is formed to be depressed outward,
The light emitting diode lamp according to claim 2, wherein a bottom portion of the reflective layer is not in contact with the shoulder portion, and a slot is formed by the bottom portion and the lower end portion. The light guide cover is provided such that the lower end portion thereof is separated from the circuit board and rides on the light emitting diode,
The light emitting diode lamp according to claim 2, wherein a slot is formed by the base, the light guide cover, and the reflective layer.   The light emitting diode lamp according to claim 5 or 6, wherein the light emitting diode is accommodated in the slot. The upper end is formed in an open shape,
The reflective layer is in contact with the inner peripheral surface of the light guide cover and extends upright along the inner peripheral surface; 2. The light-emitting diode lamp according to claim 1, further comprising an annular flange portion that protrudes from the upper end portion and extends beyond the upper end portion. The light guide cover is formed in a large diameter from the lower end portion toward the upper end portion,
The light emitting diode lamp according to claim 8, wherein the lower end portion is provided in contact with the base.   The light-emitting diode lamp according to claim 9, wherein the light guide cover is formed in a truncated cone shape.   The light emitting diode lamp according to claim 8, wherein a plurality of recesses are formed at predetermined intervals on the lower surface of the lower end portion.   The light emitting diode lamp according to claim 11, wherein the light emitting diode is accommodated in the recess.   The light emitting diode lamp according to any one of claims 1 to 12, wherein the reflective layer is white made of a plastic material.   The light-emitting diode lamp according to claim 1, wherein the light guide cover is colored.

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