JP2012059424A - Led lighting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an LED lighting apparatus that maintains a performance of the LED element itself and also a light volume stable for a long period as a whole lighting fixture including a protection cover housing an LED array.SOLUTION: The LED lighting apparatus includes a substrate 14 on which an LED group 12 is arranged and wired, a power supply circuit 16 which drives the wired LED group 12 to emit light, a reinforcing body 21 which supports the substrate 14 and has a heat sink 20 which is adhered tightly to the substrate 14 at a portion not covering the LED group 12 and dissipates heat emitted from driving of the LED group 12, a cover 22 which surrounds the LED group 12, the substrate 14, and the portion not covering the heat sink 20 of the reinforcing body 21, and a transparent optical catalyst layer 24 formed on both sides of the surface and the backside of a portion of the semi-transparent cover 22 through which light emitted from the LED group 12 is transmitted.

Description

  The present invention relates to a fluorescent lamp type LED lighting apparatus compatible with a fluorescent lamp.

  In order to prevent global warming, environmentally friendly equipment has been introduced in various fields, and the old model has been upgraded to the new energy-saving model. In lighting fixtures, not only incandescent bulbs but also fluorescent lamps are being replaced by lighting fixtures using LEDs (light emitting diodes). However, while the commercial power source is an alternating current, the LED is driven by a direct current power source. Replacing all brackets and drive units is uneconomical and impractical. Therefore, an LED lighting device that incorporates a drive circuit and can be directly mounted on an existing appliance is widely used (see Patent Document 1).

JP 2010-92990 A

The known prior art has the following problems to be solved.
LEDs not only save power, but also have a long lifespan. Fluorescent lamps become darker when used for a long time, and should be replaced as a guide. On the other hand, illumination using LEDs (light-emitting diodes) is expensive, but has a long life, and is therefore economical in terms of long-term performance. Therefore, it is required to maintain a stable light amount for a long time.
In order to solve the above-described problems, the present invention is not limited to the performance of the LED element itself, but the LED illumination that can maintain a stable light amount for a long period of time as a whole device including a protective cover that houses the LED array. An object is to provide an apparatus.

The following configurations are means for solving the above-described problems.
<Configuration 1>
A substrate that is connected by arranging LED groups, a power supply circuit that drives the connected LED groups to emit light, supports the substrate, and adheres to the substrate at a portion that does not cover the LED group, A transparent or translucent cover surrounding a reinforcing body including a heat sink that dissipates heat generated by driving the LED group, the LED group and the substrate, and a portion of the reinforcing body that does not cover the heat sink; An LED lighting device, wherein a transparent photocatalyst layer is formed on both the front and back surfaces of a portion of the cover through which light emitted from the LED group is transmitted and the surface of the heat sink.

<Configuration 2>
In the LED lighting device according to Configuration 1, the reinforcing body is a constant arcuate hollow molded body whose cross section is continuous in the longitudinal direction, and the substrate is in close contact with a band-shaped portion corresponding to a string. The curved surface of the LED and the cover constitute an outer shape compatible with a cylindrical fluorescent lamp as a whole.

<Configuration 3>
In the LED lighting device according to Configuration 1 or 2, a photocatalyst layer in which fine particles of 3 microns or less including titanium oxide and apatite are dispersed in a volatile liquid containing water as a main component and sprayed to uniformly adhere the photocatalyst layer An LED illumination device provided.

<Configuration 4>
4. The LED lighting device according to claim 1, wherein an LED that emits light having a wavelength that promotes a photocatalytic reaction is mixed in the LED group.

<Effect of Configuration 1>
With the photocatalyst layers formed on both sides of the cover, it is possible to realize a light source in which the light amount does not decrease over a long period of time. That is, when the light emitted from the LED group is transmitted through the cover, the photocatalytic layer reacts. Therefore, adhesion of oil etc. is suppressed. Further, a vapor such as a paste is generated from the substrate in which the LED groups are arranged and connected by soldering or the like by heat generated by driving the LED groups. When this vapor adheres to the back surface of the cover, not only the amount of light is reduced, but also dirt that cannot be cleaned from the outside. The photocatalyst layer generated on the back surface of the cover reacts to prevent the contamination. Even in a contaminated atmosphere, the amount of light is not reduced for a long time due to the self-cleaning effect, so that the advantage that LED lighting has a long life can be fully utilized. Moreover, the photocatalyst layer adhering to the surface of the heated heat sink reacts efficiently by reflected light or the like to purify the surrounding atmosphere.
<Effect of Configuration 2>
The cover and the reinforcing member having an arcuate cross section can be integrated to form a cylindrical main body, and a structure compatible with existing fluorescent lamps can be obtained.
<Effect of Configuration 3>
Fine particles of 3 microns or less containing titanium oxide and apatite can be attached to the cover without a binder to form a transparent photocatalytic layer. Since this photocatalyst layer does not have a binder, the photocatalyst layer is hardly deteriorated for a long period of time, and the light amount reduction due to the deterioration of the binder can be suppressed.
<Effect of Configuration 4>
When LEDs emitting light having a wavelength that promotes the photocatalytic reaction are mixed in the LED group, the photocatalytic reaction that suppresses the decrease in the amount of light can be sustained.

(A) is a perspective view which shows the Example of an LED lighting apparatus, (b) is a building perspective view. 2 is a cross-sectional view of the LED lighting device 10. FIG. It is an Example side view of a bulb-type LED lighting device. It is a peripheral circuit connection diagram of the Example of LED lighting apparatus.

  Hereinafter, embodiments of the present invention will be described in detail for each example.

Fig.1 (a) is a perspective view which shows the Example of an LED illuminating device, (b) is a building perspective view.
As shown to (a) of a figure, the LED illuminating device 10 has the external appearance similar to the improved fluorescent lamp. Although the straight pipe type is shown in the embodiment, the present invention can also be used for a circle (annular) type, a spherical type, and a U-shaped type. Moreover, although the following Example demonstrates what covered LED with the translucent cover, it can cover also with a transparent cover and can utilize also for brighter illumination.

  As shown in (b) of the figure, the LED lighting device 10 has a configuration in which the power supply circuit 16 and the substrate 14 are fixed to a reinforcing body 21 and surrounded by a semitransparent cover 22. On the substrate 14, an LED group 12 including a large number of LEDs (light emitting diodes) is mounted. The substrate 14 is obtained by arranging the LED groups 12 and connecting them by printing or the like. The power supply circuit 16 is for driving the connected LED group to emit light. The power supply circuit 16 includes an AC / DC converter and a current or voltage stabilizing circuit that stabilizes the output direct current.

  The reinforcing body 21 is constituted by a hollow aluminum alloy pipe having a bow-like cross section. This can be manufactured by an extrusion method. The reinforcing body 21 includes a heat sink that supports the substrate 14, is in close contact with the substrate 14 at a portion that does not cover the LED group 12, and dissipates heat generated by driving the LED group 12. The connection terminal 17 of the terminal cover 18 is electrically connected to the power supply circuit 16 and is assembled as shown in FIG.

FIG. 2 is a cross-sectional view of the LED lighting device 10.
As shown in the figure, the reinforcing body 21 is a certain arcuate hollow molded body whose cross section is continuous in the longitudinal direction. The substrate 14 is in close contact with a belt-like portion 26 corresponding to a string, and the heat generated by the LED group 12 is transmitted to the heat sink 20. A heat sink 20 is formed in a groove shape on the curved surface of the bow. This part and the translucent cover 22 constitute an outer shape compatible with a cylindrical fluorescent lamp as a whole. The translucent cover 22 may be composed of a plastic plate such as polycarbonate. An edge is fitted into a groove provided in the reinforcing body 21 and is integrated with the reinforcing body 21. If the semi-transparent cover 22 is made highly transparent, a brighter light source can be obtained.

  In the present invention, the transparent photocatalyst layer 24 is formed on both the front and back surfaces of the translucent cover 22 where the light emitted from the LED group 12 is transmitted. The broken line in the figure shows the photocatalyst layer 24 that is in close contact with the translucent cover 22. Thus, the photocatalyst layer 24 formed on both surfaces of the translucent cover can realize a light source that does not reduce the light amount over a long period of time.

  That is, when the light emitted from the LED group 12 passes through the translucent cover 22, the photocatalytic layer 24 reacts. Therefore, for example, when it is arranged at a cooking place or the like, oil adhesion is suppressed. Alternatively, the oil or the like adhering to the outside is decomposed so that it can be easily wiped off, and cleaning becomes easy.

  On the other hand, according to the experiment of the present invention and the like, when the LED lighting device 10 is used for a long period of time, the LED group 12 is emitted from the board 14 arranged and connected by soldering or the like by driving the LED group 12. It was found that steam such as paste was generated by the generated heat. When this vapor adheres to the back surface of the translucent cover 22, not only the amount of light is reduced, but also dirt that cannot be cleaned from the outside. If the photocatalyst layer 24 produced | generated on the back surface of the translucent cover 22 reacts, the stain | pollution | contamination can be prevented.

  As described above, it is preferable that the photocatalyst layer 24 is uniformly adhered to both surfaces of the translucent cover 22. In that case, in order to maintain a sufficient amount of light, the photocatalyst layer 24 needs to be highly transparent. A photocatalyst layer in which fine particles of 3 microns or less containing titanium oxide and apatite are dispersed and sprayed in a volatile liquid containing water as a main component and uniformly adhered is optimal for this purpose. The heat sink 20 rises in temperature due to heat generated by driving the LED group 12. The photocatalyst layer 24 reacts more efficiently as the temperature is higher. Therefore, it is preferable that the photocatalyst layer 24 is also attached to the surface of the heat sink 20. The photocatalyst layer 24 adhering to the surface of the heat sink 20 can react by receiving light mainly from a reflector disposed on the back surface of the fluorescent lamp.

  Titanium hydroxide absorbs ultraviolet light energy, generates oxygen and moisture OH radicals in the air, and has a function of decomposing organic substances by oxidative decomposition. Therefore, a method is widely adopted in which titanium hydroxide is fixed on a substrate to exert a sterilization effect. This action is a catalytic action, and the base material to which titanium hydroxide is fixed can be used as it is. For this reason, titanium hydroxide is called a photocatalyst and is widely used for purposes such as antibacterial, water purification, deodorization, and antifouling.

  Titanium hydroxide is a solid. In order to fix this to the base material, various binders are used. That is, a fine powder of titanium hydroxide is mixed in a binder solution and applied to a substrate and fixed. Or apply by spray. However, in such a photocatalyst layer, titanium hydroxide buried in the binder does not sufficiently function as a catalyst, and only what is exposed on the surface functions, so that the efficiency is poor. In addition, during spray application, various equipment that dislikes the adhesion of the binder needs to be cured, and there is a problem that the operation becomes complicated. Furthermore, there was a problem that transparency was deteriorated by the binder.

  Moreover, since the photocatalyst buried in the binder does not touch the outside air, the function of decomposing the surrounding gas becomes insufficient. For example, a commercially available product called photocatalytic titanium apatite is strongly adsorbed on the wall surface of an object due to the adsorptivity of apatite. Fine particles of 3 μm or less containing titanium oxide and apatite can be attached to a translucent cover without a binder to form a transparent photocatalytic layer. The photocatalyst remains exposed. Since this photocatalyst layer does not have a binder, it is difficult to deteriorate for a long period of time, and a reduction in the amount of light due to deterioration of the binder can be suppressed. For such a photocatalyst layer, for example, Hanno Coat CR-C (trade name of Chojong Industrial Co., Ltd.) (2-propanol + apatite-coated titanium dioxide + silicon dioxide aqueous solution) can be used.

FIG. 3 is a side view of an embodiment of a bulb-type LED lighting device.
The bulb-type LED lighting device shown in the figure has an LED group 12 and a power supply circuit 16 mounted on a substrate 14. The translucent cover 22 surrounds the LED group 12. The substrate 14 is supported so as to be in close contact with the heat sink 20. The main body electrode portion 28 has the same thread as that of the existing round bulb. This external shape is not different from the known one. Here, in this embodiment, the photocatalyst layer 24 is attached to the front and back surfaces of the translucent cover 22 and the surface of the heat sink 20. Thereby, the effect similar to said Example can be acquired.

FIG. 3 is a peripheral circuit connection diagram of the embodiment of the LED lighting device.
As shown in the figure, the LED lighting device is connected to a power source through a pair of connection terminals 17 in the same manner as a known fluorescent lamp. On the power supply side, a power plug 32, a switching regulator 34, and a terminal receiver 36 are connected in order. The power plug 32 is connected to a commercial power outlet. The switching regulator 34 is a circuit that converts AC 100 volts into DC 24 volts. The output of the switching regulator 34 is supplied to the terminal receiver 36. These constitute a constant voltage DC power source. As the terminal receiver 36, a device for mounting an existing straight tube fluorescent lamp can be used as it is. What is necessary is just to remove the step-up transformer, the glow lamp, etc. provided in the existing equipment and replace them with the circuit shown in this figure.

  On the LED lighting device side, the connection terminal 17, the rectifier circuit 40, the constant voltage control circuit 42, and the LED group 12 are connected in order. The pair of connection terminals 17 are connected to the pair of terminal receivers 36, respectively. The rectifier circuit 40 supplies a forward current to the LED group 12 through the constant voltage control circuit 42 regardless of whether the connection terminal 17 is connected to an AC power supply or a DC power supply. Thereby, the LED group 12 is protected. The constant voltage control circuit 42 is for stabilizing the terminal voltage applied to the entire circuit of the LED group 12 connected in parallel.

  When a stable drive voltage is supplied from the switching regulator 34, the constant voltage control circuit 42 may be omitted. Further, instead of the constant voltage control circuit 42, a constant current control circuit may be provided to prioritize drive current stabilization. In addition to mounting LED elements that only emit light with a necessary amount of light, LEDs that emit light having a wavelength that promotes the photocatalytic reaction can be mixed in the LED group 12.

  A wavelength slightly closer to ultraviolet light than visible light may have a higher effect of promoting the photocatalytic reaction. Depending on the type of photocatalyst to be used, LEDs emitting light having a wavelength for promoting photocatalytic reaction can be mixed in the LED group, so that the photocatalytic reaction can be sustained efficiently.

DESCRIPTION OF SYMBOLS 10 LED illuminating device 12 LED group 14 Board | substrate 16 Power supply circuit 17 Connection terminal 18 Terminal cover 20 Heat sink 21 Reinforcing body 22 Translucent cover 24 Photocatalyst layer 26 Band-shaped part 28 corresponding to a string 28 Main body electrode part 32 Power plug 34 Switching regulator 36 Terminal receiver 40 Rectifier circuit 42 Constant voltage control circuit

Claims (4)

A substrate in which LED groups are arranged and connected;
A power supply circuit for driving the connected LED group to emit light;
A reinforcing body provided with a heat sink that supports the substrate, adheres closely to the substrate at a portion that does not cover the LED group, and dissipates heat generated by driving the LED group;
A transparent or translucent cover surrounding the LED group, the substrate, and a portion of the reinforcing body that does not cover the heat sink;
An LED lighting device, wherein a transparent photocatalyst layer is formed on both the front and back surfaces of a portion of the cover through which light emitted from the LED group is transmitted and on the surface of the heat sink. The LED lighting device according to claim 1,
The reinforcing body is a constant bow-shaped hollow molded body having a continuous cross section in the longitudinal direction, the substrate is in close contact with a band-shaped portion corresponding to a string, and the curved surface of the bow and the cover, An LED lighting device characterized in that the outer shape is compatible with a cylindrical fluorescent lamp as a whole. The LED lighting device according to claim 1 or 2,
An LED lighting device comprising a photocatalyst layer in which fine particles of 3 microns or less containing titanium oxide and apatite are dispersed and sprayed in a volatile liquid containing water as a main component and uniformly adhered. In the LED lighting device according to any one of claims 1 to 3,
An LED lighting device, wherein LEDs emitting light having a wavelength that promotes a photocatalytic reaction are mixed in the LED group.

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