JP3158545U - Lighting device - Google Patents

Abstract

Provided is an illuminating device in which a plurality of LEDs are arranged in a line, and the illuminating device can efficiently dissipate heat while suppressing occurrence of brightness spots and ensuring a predetermined brightness. A plurality of long plate-like fins 2a are arranged at equal intervals, and one end of the plurality of fins on the longitudinal side is integrally formed on one base plate 2b, and the base plate A plurality of LED (light emitting diode) elements 3 arranged in a line on one side surface thereof along the longitudinal direction of the LED element, and arranged with a predetermined inclination angle with respect to the arrangement surface of the LED elements on the base plate, And a reflector 4 that reflects light emitted from the plurality of LED elements and irradiates the light in a predetermined direction. [Selection] Figure 1

Description

  The present invention relates to a lighting device, and more particularly to a lighting device in which a plurality of LEDs (light emitting diodes) are arranged in a line.

Since LEDs (light emitting diodes) have characteristics such as power saving and long life, they are expected to replace conventional lighting fixtures using incandescent lamps.
When an LED element is used as a light source for illumination, in order to obtain sufficient light, it is necessary to apply a large current to the LED element to obtain a high output.
However, when a large current flows through the LED element, the amount of heat generation increases, so one of the problems is how to efficiently dissipate heat.

To solve the problem related to heat dissipation, Patent Document 1 discloses a structure in which a plurality of LED elements 53 are provided on a heat sink 52 having a plurality of fins 51 as shown in FIG.
The structure shown in FIG. 6 will be further described. Two grooves 52a are formed in parallel on the upper surface of the heat sink 52, and two coated conductors 54 (for positive electrode and negative electrode) are fitted into the groove 52a. Yes. In addition, three LED elements 53 are connected in series by lead wires 55 to form a series set 56, one electrode of each series set 56 is connected to a positive lead 54, and the other electrode is a negative lead 54. It is connected to the.
Each series set 56 is covered with a dome-shaped packaging 57 (translucent member).

  According to such a configuration, each LED set 53 emits light when power is supplied from the two conductive wires 54 to each series set 56. Further, the heat generated from each LED unit 53 is efficiently radiated by the heat sink 52.

Utility Model Registration No. 3138910

By the way, since the light of the LED is linear, generally the emission of light emitted from a plurality of LED elements arranged in a line becomes a plurality of dots arranged in a line, and when the LED is used as a lighting device, There may be spots in the brightness.
In the configuration shown in FIG. 6, since the packaging 57 covering the LED elements 53 is a dome shape, the light of the three LED elements 53 is dispersed, and the boundary line between the irradiation areas of the adjacent LED elements 53 is It can be expected to disappear to some extent.

However, as shown in the figure, a packaging 57 is provided for each of the three LED elements 53, and a plurality (two in the figure) of the packaging 57 is arranged side by side. There was a problem that spots occurred in brightness.
Here, as shown by a broken line in FIG. 6, when all (six) LED elements 53 are covered with one large packaging 58, the above problem can be solved, but there is a problem that the thickness of the device increases. there were.
Furthermore, since the height dimension H in the packaging 58 is increased, the distance until the light irradiated from the LED element 53 passes through the packaging 58 (translucent member) becomes longer, and passes through the packaging 58. There was a problem that the brightness afterwards was greatly reduced.

  The present invention has been made paying attention to the above points, and in a lighting device in which a plurality of LEDs are arranged in a line shape, while efficiently dissipating heat, suppressing occurrence of brightness spots, a predetermined It is an object of the present invention to provide an illumination device that can ensure brightness.

In order to achieve the above object, a lighting device according to the present invention includes a plurality of long plate-like fins arranged at equal intervals, and one end on the long side of the plurality of fins is integrally formed on a single base plate. A plurality of LED (light emitting diode) elements arranged in a line on one side surface along the longitudinal direction of the base plate, and a predetermined surface with respect to the arrangement surface of the LED elements on the base plate It is characterized by comprising a reflecting plate that is opposed to each other with an inclination angle, reflects light emitted from the plurality of LED elements, and irradiates in a predetermined direction.
With such a configuration, the light emitted from the plurality of LED elements arranged in a line shape is directly reflected on the reflecting plate without passing through a light transmitting member such as packaging covering the LED elements as described in the related art. Therefore, a decrease in brightness can be suppressed.
Moreover, since the light emission of the LED element is diffused in the reflecting plate, the boundary line between the irradiation regions of the adjacent LED elements is eliminated, and a light having no spots can be obtained.

The reflecting plate is formed of the same material as the heat sink, and the reflecting plate and the heat sink are in surface contact to conduct heat from the heat sink to the reflecting plate, and the heat sink and the reflecting plate dissipate heat. It is desirable to be made.
By comprising in this way, the heat | fever generated from the LED element can be thermally radiated also from a reflecting plate, and more efficient thermal radiation effect | action can be acquired.

An insulating layer is formed on one side of the base plate, a circuit pattern for supplying power to the LED element is formed on the insulating layer, and the plurality of LED elements are electrically connected on the circuit pattern. It is desirable to be arranged.
By forming the circuit pattern on the base plate in this manner, a plurality of LED elements can be directly installed on the heat sink, and heat generated by light emission can be efficiently radiated by the heat sink.
Moreover, since it is not necessary to arrange a plurality of LED elements along the coated conductor as in the prior art, the configuration is simple and the apparatus can be made compact.

Further, in the plurality of LED elements arranged in a line on one side of the base plate, a plurality of LED units electrically connected in series for each of the plurality of LED elements are configured, and the plurality of LED units are mutually connected. It is desirable to be electrically connected in parallel.
By configuring in this way, for example, even if one LED unit cannot emit light due to disconnection at one location, the light emission of other LED units can be maintained.

  According to the present invention, in an illuminating device in which a plurality of LEDs are arranged in a line shape, an illuminating device capable of efficiently radiating heat, suppressing occurrence of brightness spots, and ensuring a predetermined brightness. Obtainable.

FIG. 1 is a perspective view showing the overall configuration of a lighting device according to the present invention. FIG. 2 is a front view (viewed by an arrow A) of the lighting device of FIG. FIG. 3 is a cross-sectional view illustrating a circuit pattern formed on a heat sink provided in the lighting device of FIG. FIG. 4 is a diagram illustrating a formation example of a circuit pattern formed on a heat sink provided in the lighting device of FIG. 1. FIG. 5 is a side view of the illumination device of FIG. FIG. 6 is a side view for explaining a coupling structure between a conventional LED and a heat conducting device (heat sink).

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing the overall configuration of a lighting device according to the present invention.
An illuminating device 1 shown in FIG. 1 includes an elongated square bar-shaped heat sink 2 serving as a heat radiating unit, and a plurality of LEDs (light emitting diodes) attached to one side of the heat sink 2 in a line shape (straight shape) along the longitudinal direction. ) Element 3.
Furthermore, the illuminating device 1 includes a reflector 4 for reflecting and irradiating light emitted from the plurality of LED elements 3 in a predetermined direction.

  The heat sink 2 is formed of, for example, aluminum so as to effectively dissipate heat generated by light emission of the LED element 3. As shown in FIG. 2 (viewed in the direction of arrow A in FIG. 1), the heat sink 2 is formed by arranging a plurality of long plate-like (four in the figure) fins 2a in parallel at equal intervals. One end of the fins 2a on the long side is integrally formed with a single base plate 2b disposed orthogonally to the fins 2a, for example. As described above, the heat sink 2 includes the plurality of fins 2a integrally formed with the base plate 2b, so that the surface area is widened and efficient heat dissipation is possible.

The plurality of LED elements 3 are installed on the one surface of the base plate 2b at regular intervals in a line shape. More specifically, as schematically shown in FIG. 3, circuit patterns 11a and 11b (see FIG. 4) for supplying power to each LED element 3 are printed on one side surface of the base plate 2b of the heat sink 2. Has been.
That is, the insulating layer 10 is formed on one side surface of the base plate 2b, and the circuit patterns 11a and 11b are formed thereon. The electrodes 3a, 3b (positive electrode, negative electrode) of the LED element 3 are connected to the circuit patterns 11a, 11b (for positive electrode and negative electrode).
With this configuration, power can be supplied to the LED element 3, and heat generated by LED emission is efficiently conducted to the heat sink 2 and dissipated. Further, since the conventional wiring structure of the coated conductor is not required, the device can be made compact and thin.

The plurality of LED elements 3 provided in a line on the heat sink 2 (base plate 2b) are connected in series, for example, every four as shown in FIG. Each LED unit 5 is connected in parallel between a positive circuit pattern 11a and a negative circuit pattern 11b as shown in the figure.
Thereby, for example, even if one LED unit 5 cannot emit light due to disconnection at one place, light emission of other LED units 5 can be maintained.

1 and 2, the reflecting plate 4 is elongated along the longitudinal direction of the heat sink 2, and as shown in FIG. 5, the rear end region 4a projects 2 downward. Two engaging ribs 4b and 4c are formed in parallel along the longitudinal direction.
The two engaging ribs 4 b and 4 c are firmly engaged with the upper part of the heat sink 2 as shown in the figure, and the reflecting plate 4 is fixed to the heat sink 2. Further, the upper surface of the heat sink 2 and the lower surface of the rear end region 4a of the reflector 4 are in surface contact, and the heat generated by the LED element 3 is also radiated from the reflector 4.
The reflector 4 is preferably formed of aluminum, which is the same material as the heat sink 2, for example. Further, the method of fixing the reflecting plate 4 to the heat sink 2 is not limited to the engagement, but may be fixing with a screw or an adhesive.

As shown in FIG. 4, the reflecting plate 4 has a reflecting surface 4 d extending from the rear end region 4 a toward the tip side with a predetermined inclination angle with respect to the installation surface of the LED element 3 on the base plate 2 b of the heat sink 2. Are arranged opposite each other.
That is, the light L emitted from the plurality of LED elements 3 provided in a line on the heat sink 2 is reflected on the reflecting surface 4d, diffused, and irradiated onto the irradiation surface 6.

  Here, the light emission of the LED element 3 is irradiated without passing through a light-transmitting member such as packaging that covers the LED element as described in the related art, and therefore, a reduction in brightness can be suppressed as much as possible. Due to the diffusion on the reflecting surface 4d, the boundary line between the irradiation regions of the adjacent LED elements 3 is eliminated, and a light without spots can be obtained.

The inclination angle, length, etc. of the reflecting surface 4d may be set and appropriately formed according to various conditions such as the installation location of the lighting device 1, thereby adjusting the irradiation direction and the irradiation brightness within a predetermined range. Is possible.
Further, when the lighting device 1 is installed, for example, in a showcase or the like, it has a simple configuration that does not require a covered conductor for power feeding, regardless of whether the heat sink 2 side or the reflector 4 side is disposed on the front side. Therefore, the degree of freedom on the display can be greatly expanded.

As described above, according to the embodiment of the present invention, light emitted from the plurality of LED elements 3 arranged in a line passes through a light-transmitting member such as packaging that covers the LED elements as described in the related art. Without being performed, since the light is directly reflected and irradiated on the reflecting plate 4, it is possible to suppress a decrease in brightness.
Moreover, since the light emission of the LED element 3 is diffused on the reflecting surface 4d, the boundary line between the irradiation regions of the adjacent LED elements 3 is eliminated, and a light without spots can be obtained.
Further, since the plurality of LED elements 3 are directly installed on the heat sink 2 on which the circuit pattern is formed, the heat generated by the light emission can be efficiently radiated by the heat sink 2.

DESCRIPTION OF SYMBOLS 1 Illuminating device 2 Heat sink 2a Fin 2b Base board 3 LED element 4 Reflecting plate 4a Rear end area 4b Rib protrusion 4c Rib protrusion 4d Reflecting surface 5 LED unit

Claims (4)

A plurality of long plate-like fins arranged at equal intervals, and a heat sink in which one end on the long side of the plurality of fins is integrally formed on a single base plate,
A plurality of LED (light emitting diode) elements arranged in a line on one side surface along the longitudinal direction of the base plate;
A reflection plate that is disposed to face the LED element arrangement surface of the base plate with a predetermined inclination angle, reflects light emitted from the plurality of LED elements, and irradiates in a predetermined direction. Lighting device. The reflector is made of the same material as the heat sink,
An illuminating device, wherein the reflecting plate and the heat sink are in surface contact to conduct heat from the heat sink to the reflecting plate, and heat is dissipated by the heat sink and the reflecting plate.   An insulating layer is formed on one side of the base plate, a circuit pattern for supplying power to the LED elements is formed on the insulating layer, and the plurality of LED elements are electrically connected to the circuit pattern. The illuminating device according to claim 1, wherein the illuminating device is provided. In a plurality of LED elements arranged in a line on one side of the base plate,
A plurality of LED units electrically connected in series for each of the plurality of LED elements are configured,
The lighting device according to claim 1, wherein the plurality of LED units are electrically connected to each other in parallel.

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