JP2004063237A - Lighting apparatus using light emitting diode - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lighting apparatus using a light emitting device, and to provide a lighting apparatus using a light emitting device easy to connect, adaptable to difference in numbers of connecting light emitting devices and color differences, while minimizing deterioration of luminance. <P>SOLUTION: On the surface of a printed board, a conductor pattern is formed for supplying power, and a plurality of light emitting devices 3 are arrayed and mounted. On the back surface, electronic parts of a lighting circuit 9 that lights the light emitting device 3 are mounted. The printed board having these devices is housed and fixed in a structure having a surface of light emission material, opposing to the light emitting device 3, to form a lighting apparatus. A lighting circuit 9 is formed by connecting a circuit connecting multiple of light emitting devices 3 in series in a constant current circuit having a transistor 11, a Zener diode 12 and resistors 13, 14, and connecting an impedance device 17 between the circuit and a power having 10 rectifying circuits and 15 smoothing circuits. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a lighting fixture using a light emitting diode.
[0002]
[Prior art]
For example, lighting devices are installed on stairs, handrails thereof, railings of pedestrian bridges, or the like, to display their locations, or to illuminate feet or the like. Generally, a light bulb or a discharge lamp is used as a light source of such a lighting fixture. In recent years, light-emitting diodes that emit light of a color close to daylight have been developed, and attempts have been made to replace them with electric bulbs or discharge lamps.
[0003]
[Problems to be solved by the invention]
However, when a lighting fixture is formed using light emitting diodes, a large number of light emitting diodes are arranged and mounted on one surface (hereinafter referred to as a front surface) of a printed circuit board on which a conductor circuit is formed, and the other surface (hereinafter referred to as a back surface). Electronic components that constitute a lighting drive circuit for causing the light emitting diodes to emit light are mounted on the printed circuit board, and the printed circuit board on which these components are mounted is placed on a surface facing the surface of the printed circuit board (the surface on which the light emitting diodes are mounted). May be housed in an appropriate box having a light transmitting property.
[0004]
Lighting devices using light-emitting diodes configured in this way are small and easy to handle and convenient to install by themselves, but when used on stairs, handrails or railings of pedestrian bridges, many lighting devices are required. Will be connected and installed. In that case, it is conceivable to send the power supply line inside or outside the equipment, but it is difficult to perform wiring work, it is easy to cause construction failure such as short-circuit of power supply line or ground fault, and it is easy to adversely affect other equipment There is a problem. Further, when the temperature of the light emitting diode increases, the light transmittance of the epoxy resin or the silicone resin enclosing the light emitting diode decreases, and the luminance of the photodiode decreases, so that a desired luminance cannot be obtained. Furthermore, this kind of lighting fixture has a problem that it is necessary to cope with a difference in the number of connected light emitting diodes and a difference in color depending on the application.
[0005]
The first object of the present invention is to provide a lighting fixture using a light emitting diode, and secondly, to solve the above-mentioned problems, to easily connect the light emitting diodes, to reduce the number of connected light emitting diodes, and to reduce the number of colors. It is an object of the present invention to provide a lighting device using a light-emitting diode which can cope with the problem and reduce a decrease in luminance.
[0006]
[Means for Solving the Problems]
According to the first aspect of the present invention, a substrate on which a large number of light emitting diodes are arrayed and mounted on a front surface and electronic components constituting a lighting circuit of the large number of light emitting diodes are mounted on a back surface is mounted with a large number of light emitting diodes. The surface opposite to the surface of the substrate described above is housed in a case having a light transmitting property. According to the present invention, since a lighting device is configured by arranging a large number of light emitting diodes, it is possible to obtain a lighting device having high illuminance, small size, and easy to handle.
[0007]
According to a second aspect of the present invention, in the first aspect of the present invention, the surface of the substrate on which a number of light emitting diodes are arranged and mounted is colored. With this feature, it is possible to compensate for the decrease in luminance (when the reflectance is increased by white color) and to enhance the effect (for example, red or orange).
[0008]
According to a third aspect of the present invention, in the first aspect of the present invention, the substrate is branched from the power supply conductive pattern extending from one end to the other end and the conductive pattern, and is connected to an electronic component of the substrate. The present invention according to claim 4, wherein a power supply conductor pattern is formed on the substrate, the power supply conductor pattern extending from one end to the other end of the power supply conductor pattern, and the power supply conductor pattern branches off from the conductor pattern. A power supply conductor pattern connected to the electronic component is formed, and a connection connector is connected to the power supply conductor pattern extending from the one end to the other end. With these features, wiring of the power supply line when connecting the lighting equipment is also facilitated, and power supply short-circuit and ground fault failure can be reduced.
[0009]
According to a fifth aspect of the present invention, in the first aspect of the present invention, the substrate is branched from the power supply conductive pattern extending from one end to the other end and the conductive pattern, and is connected to an electronic component of the substrate. A power supply conductor pattern is formed, and a protection fuse is provided on the power supply conductor pattern connected to the electronic component of the substrate branched from the power supply conductor pattern extending from the one end to the other end. With this feature, even if a short circuit fault occurs in the circuit of the board, it is possible to secure the power supply of the connected lighting fixture.
[0010]
According to a sixth aspect of the present invention, in the first aspect of the present invention, the lighting circuit connects a large number of light emitting diodes in series, and connects one end of the series circuit of the large number of light emitting diodes to one terminal of the power supply. One end is connected to the collector of the transistor, the emitter of the transistor is connected to the other terminal of the power supply via a resistor, the base of the transistor is connected to the other terminal of the power supply via a Zener diode, and the base and Zener are connected. The circuit is characterized in that a connection point of the diode is connected to a connection point of the collector and the light emitting diode via a resistor. With this feature, concentration of power on the light emitting diode can be reduced, and a rise in temperature can be suppressed.
[0011]
The present invention according to claim 7 is characterized in that, in the present invention according to claim 6, an impedance element is connected in series with a series circuit of a large number of light emitting diodes. With this feature, it is possible to reduce the number of lamps or suppress the concentration of power to the transistors constituting the constant current circuit when adopting a light-emitting diode of another color.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing a front side of a lighting fixture using the light emitting diode according to one embodiment of the present invention, 2 is a circuit diagram showing a connection state of the lighting fixture using the light emitting diode of FIG. 1, and FIG. FIG. 4 to FIG. 7 are lighting circuit diagrams of another example of the lighting fixture using the light emitting diode of FIG. 1.
[0013]
In FIG. 1, reference numeral 1 denotes a housing, 2 denotes a board (printed board) on which a conductor circuit is formed, 3 denotes a light emitting diode (hereinafter, referred to as a light emitting element), and 4 denotes a connector. The housing 1 has a U-shaped vertical cross section, and a surface facing the surface of the printed circuit board is formed of a light transmissive member such as a transparent acrylic resin. On the printed circuit board 2, a large number of light emitting elements 3 are arranged and mounted in a line along the longitudinal direction at the center of the front surface (hereinafter, the front surface is referred to as the front surface, and the back surface is referred to as the back surface). A pair of conductor patterns 5a and 5b for power supply extending from one end to the other end of the printed board 2 are formed (the conductor patterns 5a and 5b may be formed on the back surface of the board 2).
[0014]
The connectors 4 are connected to both ends of the conductor patterns 5a and 5b, respectively, and the power input from the connector 4 at one end is transmitted to the connector 4 at the other end. On the back surface of the printed circuit board 2, components constituting a lighting circuit (not shown) for lighting a large number of light emitting elements 3 arranged and mounted on the front surface are mounted. The printed circuit board 2 on which the large number of light emitting elements 3 and the lighting circuit components are mounted is inserted into and fixed to the housing 1 with the surface of the printed circuit board facing the light-transmitting surface of the housing 1. To complete.
[0015]
As shown in FIG. 2, a protective fuse 7 is inserted into the conductor patterns 5a and 5b of the lighting apparatus A connected to a commercial power supply or a DC power supply, and the protection fuse 7 is branched from the conductor patterns 5a and 5b. The protective fuse 8 is inserted in the conductor pattern 5c connected to the lighting circuit 9 of the lighting fixture A. The protection fuse 8 is also inserted into the lighting fixture A connected to the lighting fixture A via the connector 4. The selection of the protection fuse 7 and the protection fuse 8 is such that even if the conductor patterns 5a and 5b of the lighting fixture A connected at a later stage are short-circuited, the protection fuse 7 is blown before the copper foil of the conductor pattern is blown by the short-circuit. Is blown and the lighting circuit is abnormal, the protection fuse 8 is blown first and the protection fuse 7 is not blown.
[0016]
This selection is for avoiding a state where all the light emitting elements of the connected lighting fixture are turned off when the protection fuse 7 is blown before the protection fuse 8 is blown. Although the connecting fuse A is not provided with the protective fuse 7, the connecting fuse A may also be provided with the protective fuse 7. In this case, the protective fuse 7 is provided in all the lighting fixtures. However, it is not necessary to distinguish between the lighting fixture provided on the power supply side and the lighting fixture provided on the connection side.
[0017]
The lighting circuit 9 is configured as shown in FIG. That is, in FIG. 3, 6 is a commercial AC power supply, 10 is a double-wave rectifier circuit, 11 is an npn transistor, 12 is a Zener diode, 13 and 14 are resistors, and a large number of light emitting elements 3 arranged and mounted on the surface of a printed circuit board. They are connected in series (hereinafter, a circuit in which many light-emitting elements 3 are connected in series is referred to as a light-emitting element circuit).
[0018]
The light emitting element circuit has one end connected to one terminal of the dual-wave rectifier circuit 10 and the other end connected to the collector of the transistor 11. The emitter of the transistor 11 is connected via a resistor 13 to the other terminal of the dual-wave rectifier circuit 10, and the base of the transistor 11 is connected via a Zener diode 12 to the other terminal of the dual-wave rectifier circuit 10. The connection point between the base and the Zener diode 12 is connected to the connection point between the collector and the light emitting element circuit via the resistor 14 to form the lighting circuit 9. This circuit allows a constant current to flow through the light emitting element circuit, thereby suppressing power consumption and suppressing a temperature rise of the light emitting element circuit.
[0019]
Although the lighting circuit shown in FIG. 3 uses an npn transistor, a pnp transistor may be used as shown in FIG. Further, in the lighting circuit shown in FIG. 3, the power supply for supplying power to the light emitting element circuit is a pulsating flow due to the output of the dual-wave rectifier circuit 10, but as shown in FIG. A power supply provided with the smoothing capacitor 15 or a DC power supply 16 as shown in FIG. 6 may be used.
[0020]
By the way, the above lighting circuit is constituted by a constant current circuit. Therefore, when the number of lamps of the light-emitting element 3 is reduced, or when a light-emitting element that emits red or orange light with a small forward voltage drop is used, power is concentrated on the transistor 11 and heat generated by the transistor 11 itself is reduced. The heat increases, and the heat exerts an influence on the light emitting element 3 due to the temperature. To avoid this, for example, as shown in FIG. 7, an impedance element 17 is inserted between one terminal of the dual-wave rectifier circuit 10 and the light emitting element circuit. By this insertion, power concentration on the transistor 11 is avoided, the temperature is dispersed, and the influence of the temperature on the light emitting element 3 can be dispersed.
[0021]
Note that the shape of the lighting fixture A and the shape of the printed circuit board are appropriate, such as a circular shape, and the arrangement of a large number of light emitting elements is also appropriate, and the light emitting elements are arranged so that the temperature distribution during operation is uniform. Just fine. Further, when the surface of the printed circuit board 2 on which the light emitting elements 3 are arrayed and mounted, for example, white light emitting elements are arranged, if the surface is colored white, the reflectance can be increased and the decrease in luminance can be compensated. In the case where light-emitting elements that emit light or orange light are arranged, if the surface of the printed circuit board 2 is colored black, it is possible to obtain a lighting fixture with a high effect. In this case, the color for coloring the surface of the substrate 2 and the emission color of the light emitting element may be appropriately selected.
[0022]
【The invention's effect】
As described in detail above, according to the present invention, a lighting fixture that can be easily installed on any place requiring lighting, such as stairs and railings thereof, a balustrade of a pedestrian bridge, and indoors, is obtained.
[Brief description of the drawings]
FIG. 1 is a plan view showing a front side of a lighting fixture using a light emitting diode according to an embodiment of the present invention.
FIG. 2 is a circuit diagram showing a connection state of a lighting fixture using the light emitting diode of FIG. 1;
FIG. 3 is a lighting circuit diagram of a lighting fixture using the light emitting diode of FIG. 1;
FIG. 4 is a lighting circuit diagram showing another example of a lighting device using the light emitting diode of FIG. 1;
5 is a lighting circuit diagram showing another example of a lighting fixture using the light emitting diode of FIG.
FIG. 6 is a lighting circuit diagram showing another example of a lighting device using the light emitting diode of FIG. 1;
7 is a lighting circuit diagram showing another example of a lighting fixture using the light emitting diode of FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Housing 2 Printed circuit board 3 Light emitting diode 4 Connector 5a, 5b, 5c Conductor pattern 6, 16 Power supply 7, 8 Protective fuse 9 Lighting circuit 10 Rectifier circuit 11 Transistor 12 Zener diode 13, 14 Resistor 15 Smoothing capacitor 17 Impedance element A lighting equipment

Claims (7)

A substrate on which a large number of light emitting diodes are arranged and mounted on the front surface, and a substrate on which electronic components constituting a lighting circuit of the large number of light emitting diodes are mounted on the back surface, are opposed to the surface of the substrate on which the large number of light emitting diodes are arranged and mounted. A lighting device using a light emitting diode, wherein the lighting device is housed in a housing having a light transmitting surface. The lighting device using a light emitting diode according to claim 1, wherein the surface of the substrate on which a number of light emitting diodes are arranged and mounted is colored. 2. A power supply conductor pattern extending from one end to the other end of the substrate and a power supply conductor pattern branched from the conductor pattern and connected to an electronic component of the substrate. A lighting fixture using the light-emitting diode according to the above. A power supply conductor pattern extending from one end to the other end of the substrate and a power supply conductor pattern branched from the conductor pattern and connected to an electronic component of the substrate are formed, and a power supply extending from the one end to the other end is formed. The lighting fixture using a light emitting diode according to claim 1, wherein a connecting connector is connected to the conductor pattern for use. A power supply conductor pattern extending from one end to the other end of the substrate and a power supply conductor pattern branched from the conductor pattern and connected to an electronic component of the substrate are formed, and the power supply conductor pattern extends from the one end to the other end. The lighting fixture using a light emitting diode according to claim 1, wherein a protective fuse is provided in a power supply conductive pattern connected to an electronic component of the substrate branched from the conductive pattern of (1). The lighting circuit connects a number of light emitting diodes in series, connects one end of the series circuit of the number of light emitting diodes to one terminal of a power supply and the other end to a collector of a transistor, and connects an emitter of the transistor via a resistor. Connected to the other terminal of the power supply, the base of the transistor is connected to the other terminal of the power supply via a Zener diode, and the connection point between the base and the Zener diode is connected to the connection point between the collector and the light emitting diode via a resistor The lighting device using the light emitting diode according to claim 1, wherein the lighting device is a circuit comprising: 7. The lighting apparatus according to claim 6, wherein an impedance element is connected in series with a series circuit of a plurality of light emitting diodes.

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