JP2004284563A - Led unit for bicycle power generation light light source - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To eliminate intentional no-light traveling and insufficient illumination by low-speed traveling, because loads of a generator make a pedal heavy. <P>SOLUTION: By using a base with the same specification as that of a conventional lamp socket, using a space inside the base and a space where a conventional electric lamp used to be positioned, and incorporating a diode bridge rectifying circuit and a smoothing circuit for converting and an alternate current to a direct current and a direct-current voltage stabilization circuit into the space inside the base and an upper space of an opening part, a plurality of white light-emitting diodes with high electric power illumination converting efficiency is lit. Due to this structure, the LED unit can correspond to the light socket, and be replaced with the conventional lamp. As a result, loads on the pedal by traveling in the nighttime can be reduced. In addition, illumination needed for safety can be obtained even at the time of low-speed traveling. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a bicycle night lighting device.
[0002]
[Prior art]
Light bulbs used in conventional bicycle power generation lighting devices use filament types.
[0003]
[Problems to be solved by the invention]
The above filament type bulb has been used for many years and its price is inexpensive, but it requires at least several watts to secure the illuminance required for cycling, and the rotating load of the AC generator by the magnet and coil for lighting is directly This directly leads to an increased driving burden on the occupants. Therefore, compared to daytime driving, the pedal becomes heavier due to the load of the generator when driving at night, and there is a problem that the illuminance is insufficient when the vehicle is running without lighting or running at low speed.
[0004]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, a lamp of the same standard is used to light a white light-emitting diode with high power illumination conversion efficiency from a filament type bulb that consumes a lot of power, in accordance with a conventional bulb socket, and the interior space of the base is used. And a diode bridge rectifier circuit and a smoothing circuit for converting from AC to DC using the space where the conventional bulb was used, and a DC voltage stabilizing circuit are built in the base and in the space above the opening. It can be replaced with a conventional light bulb by turning it on.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
The details of each circuit component outlined above will be described. In order to light a white LED, a stable DC voltage of about 3.5 V is required, and a reverse voltage of 5 V or more cannot be applied. Bicycle generators output about 0 to 14 volts AC according to the running speed by magnets and coils, so it is necessary to rectify and convert them to DC. After the rectification, a smoothing capacitor is connected to remove the ripple, and the DC output is connected to the DC voltage stabilizing circuit. This circuit can be composed of one transistor, a Zener diode, a resistor, and a capacitor. However, an off-the-shelf three-terminal regulator is suitable because it has a small potential difference between input and output and is miniaturized. The white LED is connected to a constant-voltage stabilized output via a resistor so that the LED is turned on at around 3.5 V and turned on at 20 to 25 mA each. The diameter of the glass part of the conventional filament type bulb is about 14 to 15 mm, and the surrounding space is secured. Therefore, four white LEDs of 5 mm diameter standard can be mounted, and the illuminance necessary for night driving can be secured. Ripple removal smoothing capacitors have high capacitance and withstand voltage and are relatively large, so it is difficult to fit them together with the semiconductor circuit inside the base. Solves the problem of parts storage space.
[0006]
【Example】
1 and 2 show the appearance of the device of the present invention, and FIG. 3 shows all of the white LED lighting circuits including the alternator portion surrounded by a dotted line. Is commonly used in FIGS. 1, 2 and 3. As described in the previous section, the four white LEDs 7 to 10 are circumferentially mounted on the round substrate 11, and the ripple removing and smoothing electrolytic capacitor 4 is mounted in the center vacant portion. The rectifier circuit 2 connected to the diode bridge and the regulator 3 for constant voltage use a chip type, and are mounted so as to be almost at the inner circumference of the base on the back side of the round substrate 11 on which the LEDs 7 to 10 and the electrolytic capacitor 4 are mounted. A heat conductive silicone agent is applied, and the heat generated by the semiconductor is released to the entire base and heatsink. Reference numeral 5 denotes a bypass ceramic capacitor for stabilizing the operation of the three-terminal regulator. The resistor 6 is for absorbing an excessive current to the white LEDs 7 to 10 generated due to a variation in the output voltage of the three-terminal regulator, and is used when the variation range is large and exceeds the allowable current of the white LED to be used. It is also possible to add an LED blinking display function at the time of stoppage by a separate circuit from the electric double-layer capacitor for power storage. Further, in the case of using this LED unit, since the reflector function of the light is almost unnecessary, if the logo design letters of the product are written in reverse letters around the base side of the circular insulating spacer 12 shown in FIG. When the reflector is viewed from the front, the design letters and product name can be projected on the concave surface of the reflector.
[0007]
【The invention's effect】
The white LED unit of the present invention, which uses the same base as a filament-type bulb base that has been used for night lighting devices for bicycles for a long period of time, can be attached to a conventional socket as it is and can be used simply by replacing it. Lighter, brighter and paler illumination, which has begun to spread in cars, illuminates forward from the low speed of the start. An LED having a high conversion efficiency from electric power to light can provide a safe and new light source for a bicycle light that can be used semi-permanently without any trouble such as disconnection and hardly deteriorates.
[Brief description of the drawings]
1 is a side view of a first embodiment of the present invention; FIG. 2 is a front view of a first embodiment of the present invention; FIG. 3 is a circuit of the first embodiment of the present invention (including an AC generator portion surrounded by a dotted line); Figure [Explanation of symbols]
1. Alternator for bicycle night lighting (portion surrounded by dotted line)
2. 2. Diode bridge connection rectifier circuit part 3. Constant voltage stabilization (3 terminal regulator) circuit part 4. Ripple removal smoothing electrolytic capacitor 5. Ceramic capacitor for bypass Current limiting resistor 7.8.9.10. White light emitting diode (LED)
11. Circular printed circuit board 12. Circular insulating spacer A. Base (connection part A)
B. Base (connection part B)

Claims (1)

A diode rectifier circuit, a smoothing circuit, and a constant voltage stabilization circuit are connected to the same inner space of the base member as the base used for the filament type bulb for the AC power generation lighting device of the bicycle and the space from the base opening to the mounting of the electroluminescent member. The AC input side of the configured circuit is connected to the connection portions A and B of the same base member, and the plurality of white LEDs mounted on the circular printed circuit board 11 are turned on by the DC output obtained from these circuits. An LED unit for a light source of a bicycle power generation light, wherein the LED unit is configured to be replaceable from a filament type bulb for an AC power generation lighting device of the bicycle.

Images