JP2013109926A - Led lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting device of low cost and power consumption saving, capable of setting luminance and accurate irradiation direction sufficiently meeting with usage as a downlight.SOLUTION: The LED lighting device 1 of a bulb type using an LED light emitting element 3 as a light source is provided with an LED element 3, a convex lens 5 which is arranged frontward in an emitting direction A of light L of the LED light emitting element 3 and is used for protecting a front face of the LED light emitting element 3 and is used as a light translucent and transparent material, and a concave reflection mirror 7 which reflects the emitted light L from the LED light emitting element 3 having transmitted through the convex lens 5 and directs it toward a prescribed irradiation direction B.

Description

  The present invention relates to a light bulb-type LED lighting device suitable for downlight using an LED (light emitting diode) element as a light source.

In response to requests to extend the life of lighting devices and reduce power consumption, bulb-type lighting devices are also bulb-type fluorescent lamps that use fluorescent lamps as light sources from conventional incandescent bulbs, and light bulbs that use LED elements as light sources. The type of LED lighting device has changed, and the light bulb type LED lighting device has been gradually spreading.
A conventional bulb-type LED lighting device, for example, as shown in Patent Document 1 below, diffuses light having a high directivity and remarkable straightness emitted from an LED element, and spheres on the surface like an incandescent bulb. The main focus has been on whether to irradiate uniformly from the entire shell.

On the other hand, along with the widespread use of bulb-type LED lighting devices, bulb-type LED lighting devices suitable for such situations have also been developed so that they can be used in various situations. For example, Patent Document 2 below discloses a high-power type bulb-type LED illumination device, and Patent Document 3 below discloses a bulb-type LED illumination device that emits strong light only to the front.
In these Patent Documents 2 and 3, by arranging a lens in front of the light having straightness emitted from the LED element, the emitted light is condensed or diffused to increase the illuminance and the irradiation direction. I try to adjust it.

JP 2010-98159 A JP 2011-142060 A Utility Model Registration No. 3169860

(1) However, if high illuminance is to be obtained only with LED elements, the number of LED elements to be used is increased or higher output type LED elements are used, which increases the product cost of the LED lighting device. I will invite you.
In addition, if the irradiation direction is adjusted only by the LED element, the mounting position and angle of the LED element must be individually adjusted to a position and angle suitable for the purpose of the LED lighting device, and the assembly work is This is extremely complicated and requires high accuracy.

(2) On the other hand, if a lens or the like, which is a separate member, is combined with the LED element as in Patent Documents 2 and 3, relatively high illuminance and irradiation direction can be achieved by a lower product cost and simplified assembly work. It is expected that an LED lighting device having an adjustment function can be provided.
However, as described in Patent Document 2, a part of the light emitted from the LED element is reflected on the lens and then reflected on the inner surface of the spherical shell. Illuminance cannot be obtained.
In addition, as described in Patent Document 3, it is not possible to accurately adjust the irradiation direction by simply applying light emitted from the LED element to a spherical lens portion formed in a large number of dots on the spherical shell. Is possible.

  Therefore, to summarize the problems to be solved by the present invention, in a bulb-type LED lighting device using an LED element as a light source, it is possible to set sufficient illuminance and accurate irradiation direction that can be used as a downlight. It is an object to provide an LED lighting device with low power consumption and low cost.

  In order to solve the above-mentioned problem, the LED lighting device according to claim 1 of the present invention is a light bulb type LED lighting device using an LED element (3) as a light source, the LED element (3) and the LED. A convex lens (5) disposed in front of the light (L) emission direction (A) of the element (3) and used for protecting the front surface of the LED element (3) and as a light-transmitting transparent material; 5) a concave reflecting mirror (7) for reflecting the emitted light (L) from the LED element (3) that has passed through 5) and directing it in a predetermined irradiation direction (B). .

  The light (L) reflected by the concave reflecting mirror (7) can be made substantially parallel light.

  Moreover, the LED illumination device according to claim 3 of the present invention is a light bulb type LED illumination device using an LED element (3) as a light source, the LED element (3) and the light of the LED element (3). A plurality of LED packages (9) provided with a convex lens (5) disposed in front of the emission direction (A) of (L) and used for protecting the front surface of the LED element (3) and as a light-transmitting transparent material And a concave reflecting mirror (7) for reflecting the emitted light (L) from the LED package (9) and directing it in a predetermined irradiation direction (B).

  Further, the plurality of LED packages (9) are arranged at substantially equal positions with respect to a circumferential direction on a plane intersecting with the irradiation direction (B), and the emission direction (A) from each LED package (9). After the light (L) emitted toward the light beam is once focused at the focusing point (F), the outermost light is reflected at a predetermined reflection angle (α1) with respect to the axial direction (C) of the concave reflecting mirror (7). It is possible to configure so that it is reflected by the concave reflecting mirror (7) and proceeds in the irradiation direction (B).

The light (L) reflected by the concave reflecting mirror (7) can be made substantially parallel light.
The reflection angle (α1) can be set within a range of 3 ° to 8 °, preferably 5.5 °, for example.

The LED lighting device of the present invention has the following effects.
(1) First, by arranging a convex lens in front of the light emitting direction of the LED element, the emitted light of the LED element once diffuses through the converging point (F), so that the diffusibility is suppressed as a whole, The light is emitted in a state in which straightness is further increased. In this case, the intensity of the emitted light is approximately three times higher due to the convex lens effect of the convex lens.
Furthermore, the intensity of the emitted light having the increased illuminance is doubled by the reflection effect reflected by the concave reflecting mirror, and the emitted light has a higher illuminance and is directed toward a predetermined irradiation direction. Irradiation and progress.

(2) In addition, when the light reflected by the concave reflecting mirror is substantially parallel light, the light source has a sufficient illuminance suitable for use as a downlight and a straightness of emitted light, and is simple and low-cost. It becomes possible to provide a bulb-type LED lighting device having a structure.

(3) Also, by using a plurality of LED packages in which a convex lens is arranged in front of the light emitting direction of the LED element, the intensity of light emitted from each LED package is approximately tripled by the convex lens effect of the convex lens. Further, by combining a plurality of similar LED packages, it is possible to obtain higher illuminance in which the intensity of the emitted light is further increased by the number of LED packages.
Furthermore, the intensity of the emitted light with enhanced illuminance is doubled by the reflection effect reflected by the concave reflecting mirror, and the emitted light has a higher illuminance, resulting in a predetermined irradiation direction. Irradiate and progress toward.

(4) Further, when the plurality of LED packages are arranged at substantially equal positions with respect to the circumferential direction on the plane intersecting the irradiation direction, the circumferential direction of the emitted light emitted from each LED package In this way, it becomes possible to provide an LED lighting device having uniform brightness in the circumferential direction, and the reflection effect of the concave reflecting mirror can be utilized to the maximum.
In addition, when the light emitted from each LED package is configured to be reflected at a predetermined reflection angle with respect to the axial direction of the concave reflecting mirror, the irradiation of the LED illumination device is performed by adjusting the reflection angle. The direction can be switched appropriately.

(5) In addition, when the light reflected by the concave reflecting mirror is substantially parallel light, the LED element can be set at a sufficient cost with a sufficient illuminance optimum for use as a downlight and an accurate irradiation direction at a low cost. It is possible to provide an LED lighting device that can be used efficiently and consumes less power.

(6) Further, when the reflection angle is set within a range of 3 ° to 8 °, diffusion of outgoing light reflected and traveling by the concave reflecting mirror is suppressed, and more efficient output with less loss is achieved. A reflection state of incident light and high illuminance can be obtained.

It is a figure which shows the 1st Embodiment of this invention, and is a perspective view which shows an LED illuminating device. It is a figure which shows the 2nd Embodiment of this invention, and is a sectional side view which shows an LED lighting apparatus. It is a figure which shows the 2nd Embodiment of this invention, and is a sectional side view which shows an LED lighting apparatus. It is a figure which shows the 2nd Embodiment of this invention, and is a plane sectional view which shows an LED lighting apparatus. It is a figure which shows the result of the illuminance test performed in order to test the effect of this invention, and the result of the comparative test which measured the illuminance of the product of this invention of 5W power consumption and the incandescent lamp of 60W power consumption with two types of illuminometers FIG. It is a figure which shows the result of the illuminance test performed in order to test the effect of this invention, and the result of the comparative test which measured the illuminance of the invented product of power consumption 3W and the incandescent lamp of power consumption 40W with two kinds of illuminometers FIG. It is a figure which shows the result of the illumination intensity test done in order to test the effect of this invention, and is explanatory drawing which shows the test result which measured the illumination intensity of the product of this invention of power consumption 2W with two types of illumination meters.

Hereinafter, the LED illumination device according to the present invention is divided into (1) the first embodiment shown in FIGS. 1 and 2 and (2) the second embodiment shown in FIGS. Explained.
(1) First embodiment (see FIGS. 1 and 2)
The LED lighting device 1A according to the first embodiment is a light bulb type LED lighting device using an LED element 3 as a light source, and includes the LED element 3, a convex lens 5, and a concave reflecting mirror 7. Basically configured, and further includes a base and wiring (not shown) for obtaining a voltage for operating the LED element 3, and an electronic circuit for converting the current required for operating the LED element 3 (not shown). And a housing 15 having an electronic substrate and the like.

The LED element 3 used in the present invention is a low power type LED element 3 with 5 W, 3 W, 2 W as an example of power consumption, and the LED element normally used in a light bulb type LED lighting device is normally 10 W. Therefore, the LED element 3 is a low power type LED element with extremely low power consumption.
And in this invention, while using the low power type LED element 3 with small power consumption, the brightness comparable to the conventional incandescent bulb by combining the convex lens 5 and the concave reflecting mirror 7 described below. Have gained.

The convex lens 5 is a member having a function as a protective cover on the front surface of the LED element 3 disposed in front of the emission direction A of the light (hereinafter also referred to as “emitted light”) L of the LED element 3.
The convex lens 5 is formed as an example by a light-transmitting transparent material made of a synthetic resin whose surface is smoothly mirror-finished, and diffuses the light L emitted from the LED element 3 by the convex lens effect of the convex lens 5. In this case, the light L is once focused at a focusing point F (see FIG. 2) and then diffused to enhance the light L as a whole, thereby increasing the illuminance of the light L by about three times.

The concave reflecting mirror 7 is a plate-like member curved in a spherical shape as an example having a role of reflecting the outgoing light L from the LED element 3 that has passed through the convex lens 5 and directing it in a predetermined irradiation direction B. is there.
The concave reflecting mirror 7 is provided with a mirror body 11 that functions as a concave mirror on the inner surface side that receives the light L transmitted through the convex lens 5, and a stainless steel shade 13 is disposed on the outer surface side of the mirror body 11 as an example. It is constituted by.

Further, due to the reflection effect of the concave reflecting mirror 7, the intensity of the enhanced emitted light L is further increased, and the illuminance of the light L is about 2 before reaching the concave reflecting mirror 7. Double.
In the present embodiment, the light L reflected by the concave reflecting mirror 7 is configured to be substantially parallel light and directed in the irradiation direction B.

And according to the LED illuminating device 1A according to the present embodiment configured as described above, it is simple and low-cost with sufficient illuminance suitable for use as a downlight and straightness of the emitted light L. A light bulb-type LED lighting device having a structure can be obtained.
In addition, since the power consumption of the LED element 3 being used is small, the electricity bill is low and the life of the LED lighting device 1A can be greatly extended.

(2) Second embodiment (see FIGS. 3 and 4)
The LED lighting device 1B according to the second embodiment is a light bulb type LED lighting device using the LED element 3 as a light source, and includes eight LED packages 9 as an example including the LED element 3 and the convex lens 5. And the concave reflecting mirror 7.
And the LED element 3 used by this Embodiment is the low power type LED element 3 whose power consumption is 5W, 3W, and 2W as an example similarly to LED lighting apparatus 1A which concerns on the said 1st Embodiment. is there.

The convex lens 5 used in the present embodiment is the same convex lens 5 used in the first embodiment, and is for the purpose of enhancing the intensity of the light L emitted from the LED element 3. It is used.
An LED package 9 is obtained by packaging the LED element 3 and the convex lens 5 one by one, and further including the same housing 15 used in the first embodiment. In the embodiment, with respect to the circumferential direction on the plane intersecting with the final irradiation direction B of the light L, as shown in FIG. ing.

Further, the light L emitted from each of the LED packages 9 toward the irradiation direction A reaches the concave reflecting mirror 7 similar to that in the first embodiment and is configured to obtain a reflection effect. The reflecting mirror 7 is configured to be reflected toward the mirror body 11 on the inner surface of the concave reflecting mirror 7 at a predetermined reflection angle α2 with respect to the axial direction C of the concave reflecting mirror 7 and proceed toward the irradiation direction B. .
The reflection angle α2 is set within a range of 70 ° to 80 ° in order to obtain an efficient reflection effect. In addition, the light L reflected by the concave reflecting mirror 7 is configured to be substantially parallel light and travel in the irradiation direction B, as in the first embodiment.

And according to the LED illuminating device 1B according to the present embodiment configured as described above, at a low cost provided with more sufficient illuminance optimal for use as a downlight and an accurate irradiation direction B adjustment function. It becomes possible to obtain the LED lighting device 1B with low power consumption that enables efficient use of the LED element 3.
Further, by equally dividing the LED package 9 in the circumferential direction, variation in the circumferential direction of the emitted light L emitted from each LED package 9 is prevented, and the brightness in the circumferential direction becomes uniform. The reflection effect of the concave reflecting mirror 7 is utilized to the maximum extent.

Next, the contents and results of comparative tests 1 to 3 performed to test the effects of the LED lighting device 1 of the present invention configured as described above will be described.
(A) Comparative test 1 (see FIG. 5)
In this comparative test, an illuminance test was performed on the white LED lighting device 1 as a product of the present invention with a power consumption of 5 W and a light bulb-colored incandescent lamp with a power consumption of 60 W.
In addition, as a test condition, the product of the present invention and an incandescent light bulb were installed at a height of 3 m from the floor, and the illuminance directly below them was the illuminance meter 1 of type i-346 manufactured by Seconic Co., Ltd. The measurement was performed using two types of illuminance meters of the illuminance meter 2 called Model 5202 manufactured by “Electric Meter Co., Ltd.”.

The result of the comparative test 1 is as shown in FIG. 5, and both the illuminance meters 1 and 2 measured higher illuminance with the incandescent lamp. However, since the light in the case of an incandescent light bulb becomes diffused light, the downward illuminance when used as a downlight is considerably lower than this.
Therefore, it was found that a sufficient value can be obtained even with the present invention as the illuminance when used as a downlight. In addition, the illuminance per unit power consumption calculated from the measurement results in FIG. 5 is about 2.5 lX / W for the product of the present invention, and about 0.34 to 0.36 lX for the incandescent bulb. The feature of the product of the present invention, in which the product of the present invention is about 7 times larger than the incandescent bulb and high illuminance can be obtained with less power consumption, is confirmed.

(B) Comparative test 2 (see FIG. 6)
In this comparative test, an illuminance test was conducted on a light bulb-colored LED lighting device 1 that is a product of the present invention with a power consumption of 3 W and a light bulb-colored incandescent light bulb with a power consumption of 40 W. The test conditions are the same as those in the comparative test 1.
The result of the comparative test 2 is as shown in FIG. 6, and the same test result as that of each test 1 was obtained. Also, the illuminance per unit power consumption calculated from the measurement result in FIG. 6 is about 3.18 to 2.7 lX / W in the case of the present invention product, and about 0.31 in the case of the incandescent bulb. The product of the present invention is about 10 times larger than the incandescent bulb, which is about 0.28 lX / W, and as in Comparative Test 1, the features of the product of the present invention that can obtain high illuminance with low power consumption are supported.

(C) Comparative test 3 (see FIG. 7)
In this comparative test, the illuminance test of the bulb-colored LED lighting device 1 which is the product of the present invention with power consumption of 2 W was performed under the same conditions as in the comparative tests 1 and 2.
The result of the comparative test 3 is as shown in FIG. 7, and the illuminance is lower than that of the product of the present invention with the power consumption of 3 W measured in the comparative test 2, but the illuminance that can be used as a downlight depends on the use conditions. Obtained. The illuminance per unit power consumption calculated from the measurement results in FIG. 7 is about 2.3 to 1.95 lX / W, which is about 7 times larger than the 40 W incandescent bulb measured in the comparative test 2 above. As in Comparative Tests 1 and 2, the features of the product of the present invention that provides high illuminance with low power consumption were confirmed.

The above is the basic embodiment of the present invention, but the LED lighting device 1 of the present invention is not limited to the two embodiments described above, and is a part within the scope not departing from the gist of the present invention. It is possible to change or omit the general configuration, or add conventional techniques well known to those skilled in the art.
For example, when adjusting the irradiation direction B of the light L emitted from the LED illumination device 1 of the present invention, the angle of the optical axis of the emitted light L emitted from the LED element 3 and the mounting angle of the concave reflecting mirror 7 are set. It is possible to adjust by appropriately varying. And the LED lighting apparatus 1 provided with the adjustment function of the irradiation direction B of such light L can respond | correspond to the use not only as a downlight but as a spotlight.

  Further, the number of the LED packages 9 in the case where a plurality of LED packages 9 each including the LED element 3 and the convex lens 5 are arranged is not limited to eight adopted in the second embodiment, and can be further increased. It can be reduced. In addition to the configuration in which these LED packages 9 are arranged equally on one circumference as in the second embodiment, the arrangement is arranged equally on a plurality of concentric circles. Alternatively, it may be arranged in a matrix.

  INDUSTRIAL APPLICABILITY The present invention can be used in the manufacture and use fields of a bulb-type LED lighting device that supports downlights, and in particular, when it is desired to obtain an LED lighting device that can obtain sufficient illuminance and can reduce power consumption at a low cost. Have the possibility to use.

DESCRIPTION OF SYMBOLS 1 LED lighting apparatus 3 LED element 5 Convex lens 7 Concave reflection mirror 9 LED package 11 Mirror body 13 Sade 15 Housing L Output light (light)
A Output direction B Irradiation direction C Axial direction F Focusing points α1, α2 Reflection angle

Claims (6)

A light bulb type LED lighting device using an LED element (3) as a light source,
An LED element (3);
A convex lens (5) disposed in front of the light emitting direction (A) of the LED element (3) and used for protecting the front surface of the LED element (3) and as a light-transmitting transparent material;
A concave reflecting mirror (7) for reflecting the emitted light (L) from the LED element (3) that has passed through the convex lens (5) and directing it in a predetermined irradiation direction (B). LED lighting device characterized. The LED lighting device according to claim 1,
The LED illumination device characterized in that the light (L) reflected by the concave reflecting mirror (7) is substantially parallel light. A light bulb type LED lighting device using an LED element (3) as a light source,
The LED element (3) and the LED element (3) are arranged in front of the light (L) emission direction (A), and used as a protective and light transmissive transparent material for the front surface of the LED element (3). A plurality of LED packages (9) comprising a convex lens (5);
An LED illumination device comprising: a concave reflecting mirror (7) that reflects outgoing light (L) from the LED package (9) and directs it in a predetermined irradiation direction (B). The LED lighting device according to claim 3.
The plurality of LED packages (9) are arranged at substantially equal positions with respect to a circumferential direction on a plane intersecting the irradiation direction (B), and are directed from each LED package (9) toward the emission direction (A). The light (L) emitted in this way is reflected by the concave reflecting mirror (7) at a predetermined reflection angle (α1) with respect to the axial direction (C) of the concave reflecting mirror (7), and the irradiation direction ( B) It is comprised so that it may advance toward (B), The LED illuminating device characterized by the above-mentioned. The LED lighting device according to claim 4,
The LED illumination device characterized in that the light (L) reflected by the concave reflecting mirror (7) is substantially parallel light. The LED lighting device according to claim 4 or 5,
The LED illumination device, wherein the reflection angle (α1) is set within a range of 3 ° to 8 °.

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