JPH0354084A - Tail lamp for bicycle - Google Patents

Abstract

PURPOSE:To use a tail and stop lamps in combination through a single bulb and a dynamo source and to reduce the size of a tail lamp by a method wherein the tail lamp is flickered by a flickering circuit during operation of a brake, and even after a stop, lighting is effected by means of a electric double cell capacitor for a specified time. CONSTITUTION:During running of a bicycle, a head lamp 2 is lighted ON by means of a dynamo 1, a stable DC voltage is generated by a constant voltage circuit 3, and an electric double cell capacitor C1 is charged at a specified voltage. Meanwhile, in a tail lamp 4, the lamp 4 is charged with a lighting current through a stop switch 5 and a transistor Tr1, turned ON, by means of the circuit 3 to light ON the lamp regardless of oscillation operation of a flinterking circuit 6. With a brake operated, the switch 5 is opened, and there fore the circuit 6 starts oscillating operation by means of the circuit 3 serving as a drive source. Along with repetition of automatic turning ON and OFF of transistors Tr2 and Tr3, a transistor Tr4 is also turned ON and OFF to flicker the lamp 4, and the lamp 4 is worked as a stop lamp to cause other bicycle to visibly confirm operation of a brake.

Description

[Detailed description of the invention] (b) Industrial application field The present invention relates to a bicycle tail lamp.

(Example) Conventional technology When riding a bicycle at night, there have been conventional stop lamps that turn on or flash when braking.These stop lamps help improve safety by making the bicycle visible to cars behind it. This stop lamp is often housed in the same case as the tail lamp, which indicates that the vehicle is in motion. In addition, the power source for the stop lamp uses a separate power source, such as a dry battery or a secondary battery. (C) Problems to be Solved by the Invention However, if the stop lamp is housed in the same case as the tail lamp, it is necessary to secure space for two lamp bulbs, which has the disadvantage of increasing the size of the lamp case. This had the disadvantage of requiring a large number of parts.

Another drawback was that it required a separate power source, such as a dry battery, to light the stop lamp. The present invention has been made in view of the above points, and it is an object of the present invention to provide a miniaturized bicycle tail lamp that can function as both a tail lamp and a stop lamp using only one light bulb and a dynamo power source. Purpose. (2) Means for Solving the Problems The bicycle tail lamp according to the present invention includes an electric double tank capacitor charged by a dynamo, a constant voltage circuit powered by the dynamo, and a tail lamp that lights up when riding and when braking. and a flashing circuit that can oscillate using the constant voltage circuit as a power source, and when the brake is operated, the flashing circuit causes the tail lamp to flash, and even after the vehicle has stopped, the tail lamp remains in the electric double tank capacitor's state for a certain period of time. It is possible to light the lamp by discharging electricity through the tail lamp.

(E) Function During driving, the electric double tank capacitor is charged by the dynamo, and the constant voltage circuit is powered by the dynamo. Therefore, when the bicycle is running, the tail lamp is turned on by this constant voltage circuit. When the brakes are applied, the stop switch is activated, and the flashing circuit is activated by the constant voltage circuit, which changes the tail lamp from steady lighting to flashing lighting, allowing other vehicles to see that the brakes have been applied and preventing a rear-end collision. ．． Even when the brakes are applied and the vehicle comes to a stop, the tail lamp remains lit for a certain period of time due to the discharging current of the electric charge in the electric double tank capacitor, allowing other vehicles to see that the vehicle is stopped, thereby increasing safety.

? f) Example Embodiments of the present invention will be described below based on the drawings.

Figure 1 is an electrical circuit diagram that flashes the tail lamp when braking and also lights the tail lamp for a certain period of time after the bicycle has stopped, where l is the dynamo that generates electricity when the bicycle is running, and 2 is the headlight that is lit by this dynamo 1. Light, 3 is Zener diode ZD2 and transistor Tr1
An electric double tank capacitor 01 is provided as a constant voltage circuit composed of a constant voltage circuit g3 and a resistor R4, and is charged by the constant voltage circuit g3. One end of the electric double tank capacitor 〇■ is connected to the emitter of the transistor Tr.

4 is a tail lamp, and at one end there is a stop switch 5 which is normally closed and opens in conjunction with it when braking, and is it the same as the flashing circuit described below? Then ON. OF
The transistor Tr4 which performs F is connected in parallel. Reference numeral 6 designates a flashing circuit that flashes the tail lamp 4 during braking, and is a well-known unstable multi-vibrator circuit in which two transistors Tr, Tr, repeatedly turn ON and OFF in a free-running manner to produce an oscillating effect. . The astable multivibrator circuit consists of two transistors Tr, ,
The bases and collectors of the transistors Tr, , Tr, are connected to each other by coupling capacitors C1 and C, and the transistors Tr, , Tr alternately repeat the state in which one is ON and the other is OFF. This period is, for example, the transistor Tr2
The time T1 from OFF to ON is the time constant R, which determines the discharge time of the charge in the capacitor C.
On the other hand, in the transistor Tr, the time T2 from OFF to ON is based on the capacitor C.
They are determined based on the time constants R and C, which determine the discharge time of the two charges.

Then, the transistor Tr4 is turned on by the pulse wave output to the collector of the transistor Tr4. By repeatedly turning off the tail lamp 4, it can function as a stop lamp. Transistor Tr...? Resistances R2 and R, at r, represent load resistances.

In addition, the Zener diode zD1 is for voltage control,
Diode D■ is for rectifying the dynamo current.

With the above structure, the stop switch 5 is closed as shown in the figure when the brake is not applied.

When the bicycle is running, the headlight 2 is turned on by the dynamo 1, and at the same time, a stable DC voltage is obtained by the constant voltage circuit 3, and the electric double tank capacitor C is charged to a constant voltage.

On the other hand, regardless of the oscillation operation of the flashing circuit 6, the tail lamp 4 is lit by a lighting current flowing through the constant voltage circuit 3 through the stop switch 5 and the ONL transistor Tr2.

When the brake is operated, the stop switch 5 opens.

As a result, the blinking circuit 6 starts to oscillate using the constant voltage circuit 3 as a late power source. Transistor h.2, Tr, is automatically turned on. The transistor Tr4 is turned off repeatedly, and accordingly, the transistor Tr4 is also turned on. OFF, the tail lamp 4 flashes, and the tail lamp 4 acts as a stop lamp, allowing other vehicles to see that you have applied the brakes and preventing a rear-end collision. Then, when the driver releases the brake and stops, the stop switch 5 closes and the tail lamp 4
In that case, the charge in the electric double tank capacitor C1 will be discharged via the tail lamp 4 and the stop switch 5, and the tail lamp 4 will remain on for a certain period of time until the discharge ends. In order to ensure safety, the vehicle will continue to do so and notify the driver that the vehicle has stopped.

In this way, you can use a single light bulb and use a dynamo power source without using a separate power source such as a dry battery, and when braking
This can be blinked or lit.

Figure 2 shows a perspective view of this tail lamp, which also serves as a stop lamp, attached to the rear fender of a bicycle, and Figure 3 shows a schematic diagram of the configuration of the tail lamp. In each figure, rotation IB. A case with a curved shape that follows the fender 9 of S] A printed circuit board 11 incorporating a light bulb 2, the proposed electric double tank capacitor 〇〇, a flashing circuit 4, etc. is housed inside the case IO, and this case IO has a lens function. Cover the case I with the cover body 12 and tighten the screws 13.
It is fixed to the fender 9 via the boss portion l4 of O. The wire l5 coming out of the case 10 is connected to the terminal of the dynamo l, and the wires 16 and l6 are similarly wired to the switch 5.

(G) Effects of the Invention As described above, according to the present invention, one light bulb can be used both as a tail lamp and as a stop lamp that flashes during braking, so the lamp storage case can be made smaller and more compact. Also, since only one light bulb is required, the number of parts can be reduced.

Furthermore, since the power source that causes the tail lamp to blink as a stop lamp when braking uses a dynamo power source, a separate power source such as a battery power source is not required, resulting in lower cost, smaller size, and no maintenance costs. Furthermore, by simply installing an electric double tank capacitor that is charged by the dynamo, the tail lamp can be turned on for a certain period of time even after the vehicle has stopped, which has the effect of further improving safety.

[Brief explanation of drawings]

FIG. 1 is an electric circuit diagram of the present invention relating to a tail lamp with a stop lamp function, and FIG. 2 is a perspective view of the tail lamp with a stop lamp function installed on the rear fender of a bicycle.
FIG. 3 is a schematic exploded perspective view of a tail lamp with a stop lamp function. 1... Dynamo, 3... Constant voltage circuit, 4... Tail lamp, 5... Stop switch, 6... Flashing circuit, C4... Electric double tank capacitor Figure 1

Claims (1)

[Claims] The vehicle includes an electric double tank capacitor that is charged by a dynamo, a tail lamp that lights up when driving by a constant voltage circuit that uses the dynamo as a power source, and a flashing circuit that can oscillate using the constant voltage circuit as a power source when braking, The bicycle is characterized in that when the brake is operated, the tail lamp is made to blink by the blinking circuit, and even after the bicycle has stopped, the tail lamp can be lit for a certain period of time by discharging through the tail lamp of the electric double tank capacitor. tail lamp.