JPH0577775A - Bicycle illuminating device - Google Patents

Abstract

PURPOSE:To prevent wasteful discharge of a secondary battery by making a multiple connection of the head lamp, a generator, a solar battery and the secondary battery to each other, detecting the traveling/stopping by means of the output of the generator, and turning on/off a switching means where the secondary battery is connected to a head lamp. CONSTITUTION:The power generated by a solar battery 8 is charged into a secondary battery 10 when a bicycle is left in a sunny place in the day time. In this condition, the output of a generator 5 is zero. Since the first and the third switching means T1, T3 are turned off, a head lamp 2 is turned off, and the secondary battery 10 is not discharged. Then, in the case of traveling at night, the power is generated by the generator 5 which is a traveling detecting means, and the electromotive force is rectified by a full-wave rectifier 12, this is applied to a base of the third switching means T3. When T3 is turned on, a delay capacitor (C) is charged instantaneously. At the same time, the second switching means T2 is turned on and a tail lamp 3 is turned on, and the first switching means T1 is turned on to light the head lamp 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle lighting device.

[0002]

2. Description of the Related Art Conventionally, a lighting device for a headlight of a bicycle is generally one that uses an electromotive voltage of a generator that generates power as wheels rotate, and one that uses a dry battery. However, the method of (1) causes no light when the vehicle is stopped or traveling at low speed, which is a problem in terms of safety measures. Therefore, it has been proposed that a secondary battery is provided and charged by a generator, and the secondary battery is turned on by the discharge current of the secondary battery when the vehicle is stopped or traveling at a low speed. However, there is a drawback that the load on the generator increases, the rotation of the pedal becomes heavy, and the traveling performance is poor.

The method (1) does not have the drawback that the headlight cannot be turned on and the pedal rotation becomes heavy unlike the method when the vehicle is temporarily stopped or running at a low speed, but since the bicycle has a small battery storage space, it does not have a battery. Limited in capacity,
The battery must be replaced frequently, which is uneconomical, and if you forget to replace the battery, you will be forced to run without lights, which is dangerous, and if you forget to disconnect the battery, it will cause unnecessary battery consumption. There are drawbacks.

[0004]

SUMMARY OF THE INVENTION In consideration of the above-mentioned drawbacks, the present invention keeps the safety at the time of temporary stop or low speed running, improves the running performance, and prevents the headlight from being uselessly turned on. The present invention relates to an economical lighting device for a bicycle, which enables miniaturization of batteries and secondary batteries.

[0005]

SUMMARY OF THE INVENTION According to the present invention, a headlamp, a generator that generates power as the wheels rotate, a solar cell that receives sunlight to generate power, and a secondary battery are connected in parallel to each other, and A switching means is interposed between the secondary battery and the generator output to detect running and running stop, and the switching means is turned on during running to delay the running stop and to OF.
The above problem is solved by providing a control circuit for F.

[0006]

By the above means, since the generator is not operated during the daytime, the switching means is OFF, and the secondary battery is charged by the solar cell in this state. When night driving is started, the switching means is turned on by the control circuit, the headlights are turned on by the secondary battery initially, and by the generator when the running speed increases, and when the vehicle speed decreases, the control circuit switches for a predetermined time. The means is turned on and the headlight is turned on and then turned off.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Reference numeral 1 is a bicycle having a headlight 2 made of a light bulb in the front part and a taillight 3 made of a light emitting diode in the tail part.
It can be freely tilted to the front hawk and does not generate power at the "starting" position
An AC generator 5 that generates electric power by rotating front wheels 4 at a position is provided, a tail light 3 is provided rearward on a mudguard 7 on a rear wheel 6, and a solar cell 8 that generates electricity by sunlight S is provided upward. The tail light unit 9 is attached.

The above-mentioned headlight 2, taillight 3 and the like are assembled in the electric circuit of FIG. 1 and mounted in the taillight unit 9 or a control box (not shown). This electric circuit will be described. The solar cell 8, the secondary battery 10, the headlight 2, and the generator 5 are connected in parallel with each other. A backflow prevention diode D1 is provided between the solar cell 8 and the secondary battery 10, and a first switching means T1 composed of an NPN transistor is provided between the secondary battery 10 and the headlamp 2. Is provided between the headlamp 2 and the generator 5 and comprises a switching means T1, an overcurrent preventing positive temperature coefficient thermistor 11, a backflow preventing diode D2, and diodes D4 to D7 connected to the bridge. A full-wave rectifier 12 and a secondary battery 10 and a generator 5 are provided.
Between the thermistor 11, diode D2, full-wave rectifier 1
2 are installed. The thermistor 11 acts so that an overvoltage is not applied to the headlight 2 and the secondary battery 10 when traveling at high speed.

Reference numeral 13 is O when the switching means T1 is running.
An NPN transistor in which a collector is connected to the positive electrode of the secondary battery 10 via the first resistor R1 and the tail lamp 3 and an emitter is connected to the base of the switching means T1 in the switching means control circuit which is turned off with a delay after the driving is stopped. A second switching means T2 for amplification consisting of a secondary battery 1 at one end
A delay capacitor C whose other end is connected to the negative electrode of 0 through the second resistor R2 to the base of the second switching means T2;
The emitter is connected to the positive electrode of the secondary battery 10, the collector is connected to the connection point of the resistor R2 and the capacitor C, and the base is the third resistor R.
3, a diode D3, and a third switching means T3 composed of a PNP transistor connected to the generator 5 via a full-wave rectifier 12.

Next, the operation of the above embodiment will be described. When the bicycle 1 is placed in a place where it receives sunlight during the daytime, the solar battery 8 generates electric power, and the secondary battery 10 is charged thereby. At this time, the output of the generator 5 is zero, and the third switching means T3OF
F, the second switching means T2 is OFF, and the first switching means T1 is OFF, so the headlamp 2 is off and the secondary battery 10 is not discharged. The diode D2 blocks the base current of 10 → T3 → R3 → 10 and the switching means T3 is not turned on.

Next, when the vehicle travels at night, electric power is generated by the generator 5 which is the traveling detecting means, and this electromotive voltage is rectified by the full-wave rectifier 12, which is applied to the base of the third switching means T3 and turned on. Then, the capacitor C is instantaneously charged, the second switching means T2 is turned on to turn on the tail lamp 3, and the first switching means T1 is turned on to turn on the headlamp 2.

The headlight 2 and the taillight 3 are turned on by the secondary battery 10 when the vehicle speed is not sufficient and the voltage of the generator 5 is lower than the voltage of the secondary battery 10, and by the generator 5 when the vehicle speed becomes high. Of course, when the secondary battery 10 is insufficiently charged, it is charged by the generator 5.

When the vehicle speed decreases or the vehicle stops, the third
The switching means T3 is turned off, but since the secondary battery 10 is charged, the second charge due to the charge of the capacitor C
The third switching means T2, T3 are kept on for a predetermined time (for example, about 1 minute), and the tail lamp 3 and the headlight 2 are rechargeable by the secondary battery 10.
Lights up. Therefore, safety is improved even when the vehicle is stopped by a signal or the like.

The secondary battery 10 thus discharged is charged by the electromotive voltage of the generator 5 generated by running the bicycle.

In the above operation, the headlamp 2 is turned on by the secondary battery 10 when the secondary battery 10 is being charged, so that the load on the generator 5 is small and the pedal travel becomes easy. Further, since the tail lamp 3 is used as the collector resistance of the second switching means T2, the collector current (for example, several meters) is used.
A to several tens of mA) can be effectively used for lighting the tail lamp 3 without wasting it. Further, since the lighting time of the headlight 2 when traveling at low speed or at a stop is limited to a predetermined time, wasteful consumption of the secondary battery 10 can be prevented, overdischarge can be prevented, and the solar cell 8 can be downsized. Also, the secondary battery 10 can be downsized.

The present invention is not limited to the above embodiment, the vehicle speed at which the first switching means T1 is turned ON can be set arbitrarily, and the configuration of the control circuit can be variously changed.

[0017]

According to the present invention configured as described above,
The secondary battery is charged by the solar cell and the generator to turn on the headlight, so the headlight can be turned on even when the vehicle is stopped or running at low speed, and the safety can be maintained. By charging the battery at a low level, the load on the generator can be reduced and the running performance can be improved. Further, since the switching means is turned on by the operation of the control circuit for a predetermined time after traveling and after stopping traveling, wasteful discharge of the secondary battery can be prevented, and the solar cell and the secondary battery can be downsized and the secondary battery can be downsized. It has a great effect of reliably preventing over-discharge of the battery.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of an embodiment of the present invention.

FIG. 2 is a side view of the bicycle equipped with the embodiment.

[Explanation of symbols]

 2 Headlight 5 Generator 8 Solar cell 10 Secondary battery 13 Control circuit

Claims (1)

[Claims] 1. A headlight, a generator that generates power as the wheels rotate, a solar cell that receives sunlight to generate power, and a secondary battery are connected in parallel with each other, and between the headlight and the secondary battery. The switching means is interposed, and the traveling and the traveling stop are detected by the output of the generator, and the switching means is operated during traveling.
A bicycle lighting device including a control circuit that is turned off after a delay from the stop of running.