JPS5820536A - Lighting device for bicycle - Google Patents

Abstract

PURPOSE:To both turn on a lamp of a bicycle at its stopping and eliminating the necessity for using a conventional dry cell thus increase economy, by charging a rechargeable cell with a solar cell mounted to the bicycle, utilizing this electric energy and turning on the head lamp or the like for running at night. CONSTITUTION:A solar cell 1 is mounted to sunny place in a handle part, pallet part, etc. of a bicycle, and a rechargeable cell 5 is charged by electromotive force of the solar cell obtained by the sunlight. Here a constant voltage circuit, consisting of a Zener diode 3 and a resistor 2, is provided to an electric circuit between the solar cell 1 and the rechargeable cell 5, to prevent an overchrge. Further a diode 4 is provided to prevent a reverse current from the cell 5 to the cell 1. When a lamp 7 is turned on at night, a manual switch 6 is closed to turn on the lamp 7.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a lighting device in which a rechargeable battery is charged by a solar battery attached to a bicycle, and a headlight or the like of the bicycle is illuminated from the solar battery.

Conventionally, bicycle generators are commonly used.

When the bicycle is running, friction with the rotating tires causes the generator to turn, and this turns on the headlights, etc. This system had many drawbacks, such as the following, and was seriously lacking in safety and comfort: ■The generator was not able to handle the rotation of the bicycle tires.

The pedal is very heavy, which puts a burden on the driver.

For the following reasons, some drivers often drive without lights, causing accidents.

■The voltage generated by the generator increases with each rotation, so when you are driving at a sufficient speed, you can get sufficient illuminance, but it is best to drive slowly while making sure that it is safe.
In some places, the headlights are extremely dim and useless when needed.

■When stopped, the smoke completely disappears, creating a major flaw in ensuring safety during temporary stops at intersections. Furthermore, it is often inconvenient to park and store the vehicle in a dark place.

In addition, in the method of attaching a portable lamp that uses dry batteries,
Although the above drawbacks are eliminated, there are other drawbacks as follows.

■If the batteries run out, they will no longer turn on, and you may not be able to use them when you need them.

■It is necessary to frequently replace dry batteries, which incurs expense.

The present invention: Eliminates all of the above drawbacks and also has the following advantages.

■Long life 2. Can be used semi-permanently unless mechanically damaged.

■Since there are no moving parts, breakdowns are extremely rare.

■Since it uses inexhaustible and free sunlight as its energy source, operating costs are low.

■Bicycles are originally intended to be used and stored outdoors.
Charging by sunlight is easily done.

■Compared to conventional methods, it is extremely safe and comfortable.

An embodiment of the present invention will be described below with reference to the drawings.

The solar cell 1 is attached to a part of the bicycle that is often exposed to the sun, such as the handlebar or the loading platform, and the electromotive force obtained from the sunlight is used to charge the rechargeable voltage 5. As the rechargeable battery 5, nickel or cadmium batteries are well suited for the purpose, but lead-acid batteries and alkaline batteries can also be used.

Resistor 2 and the Zener diode constitute a constant voltage circuit to prevent overcharging. Diode 4 prevents reverse current from rechargeable battery 5 to solar cell 1 .

The lamp 7 is blinked by the manual switch 6.

The lamp 7 is usually 6V, 3~6W@[. Therefore, the voltage of the rechargeable battery 5 is selected according to the lamp 7, and the capacity is determined according to the 2 daylight hours.

The capacity will vary depending on the frequency of use of the lamp 7, the riding conditions of the bicycle, and the storage conditions, but the approximate capacity is one that can be used without recharging for about one month's worth of nighttime use.

For the solar cell 1, the required area and the number of elements to be connected in series and parallel are determined based on the voltage and capacity of the rechargeable battery 5, the frequency of use of the lamp 7, the sunshine hours, the running conditions of the rotating army, and the storage conditions. Generally, due to the nature of bicycles, they are used and stored outdoors, and they are rarely used for long periods of time at night, so a solar battery that is large enough to be attached to the handlebar or cargo area of a bicycle is sufficient. Covers the electricity used.

Furthermore, if necessary, it is also possible to install tail lights and direction indicator lights and use the main power supply.

[Brief explanation of the drawing]

FIG. 1 is a block circuit diagram showing one embodiment of the present invention. 1. Solar cell 2, Resistor 3, Zener diode 4, Diode 5, Rechargeable battery 6, Manual switch 7, Lamp patent applicant Yoshihito Kodama 1) Weiren 1 mouth

Claims (1)

[Claims] A lighting device for a bicycle, characterized in that a rechargeable battery is charged by a solar cell attached to a bicycle, and the electric energy is used to light a headlight for night riding.