JPH01309883A - Battery light for bicycle - Google Patents

Abstract

PURPOSE:To save waste of battery and keep proper intensity of light, by installing a lead switch which is functioned by a battery, an optical sensor and a magnet and controlling light by a retriggerable one-shot multi-vibrator circuit. CONSTITUTION:Power supply is a primary battery or a secondary battery B. A lead switch LS is installed on a front fork at a position facing to a magnet M which is installed to a wheel, and it is so made that contact points of LS close by magnetic flux of the magnet M. Voltage at a point (a) is changed by receiving light volume of an optical sensor CdS. One-shot multi-vibrator circuit is composed of NAND gates G2, G3, a condensor C3 and a resistance R6. Therefore, when runs at night when receiving light volume of the optical sensor CdS is small, LS is closed by the magnet M and a lamp L is lighted, and even after stopping, lighting is maintained because LS is closed for a specified time. As it is not necessary to set hysteresis, lighting and putting out can be made, with small consumption of the battery B.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a battery-operated bicycle light, particularly an electronic circuit, which is turned on for a certain period of time during night riding and even when the bicycle is stopped.

BACKGROUND OF THE INVENTION Conventionally, as bicycle lights, electric generating lamps or battery-powered lights that are turned on and off by a manual switch have been widely used.

Problems to be Solved by the Invention Conventionally used power generation lamps require a large amount of energy to drive the dynamo with the wheels.

In other words, when driving at 15 km/h and not using the power generation lamp, the vehicle can run with an input energy of approximately 30W, but when driving with the power generation lamp with an output of 3W turned on, it requires 8 input energy of approximately 43W, which is approximately 43W. % more input energy is required.

Therefore, it places a heavy burden on women and children in particular, and many people drive without using power generation lamps even at night, which is dangerous for traffic safety. In addition, in the case of battery-powered lights, if you turn on the switch before driving, the lamp will remain on even when you are waiting at a traffic light at an intersection, and it will remain on even when you are passing through a bright place such as a shopping district, and the battery will remain on. It wears out quickly and is uneconomical.

Means for Solving the Problems In order to solve this problem, the present invention provides a light sensor that uses a rechargeable battery or a secondary battery as a power source to detect the brightness of the surroundings without using a power generation lamp, and a bicycle. In order to detect whether the motor is stopped or running, a retriggerable one-shot multivibrator circuit consisting of a NARD gate and a transistor is constructed using a magnet and a reed switch.
It controls turning on and off the light bulb.

Function: With this kind of configuration, the light will not turn on during the day, and at night it will turn on while driving and for a certain period of time (for example, 4 seconds) after stopping, but in a bright place such as a shopping district, the light will turn off automatically to save battery life. can be used efficiently.

Example Embodiments of the present invention will be described below with reference to FIG.

M is a magnet and is attached to the spokes of a bicycle wheel or the pulp of a tube. The LS is a reed switch that forms part of the light lighting circuit, and is connected to a magnet on the front fork.
Install it in the position corresponding to M. HAND gate cz2.
G5, capacitor C3, and resistor R6 constitute a one-shot multi-node (ibrator circuit).

Next, the operation will be explained.

<Daytime> The optical sensor CdS (cadmium sulfide photoconductor) is connected in series with the resistor R3, and these are connected in parallel to the power supply battery B. Since the resistance value of the optical sensor C (is is low when the amount of light received is large), the voltage at the connection point a of R5 and CdS is low. If this voltage is lower than the threshold voltage of the gate G1, the output of the gate 1-G is It becomes H. Game)
When the output of G1, that is, the input of gate G2 becomes H, the output of gate G2 becomes L, and since the input of gate G3 is L, its output becomes H, and the output of transistor Q2. Q5 becomes non-conductive, and lamp L remains on even when the bicycle is stopped or running.
does not light up.

<Night> When the amount of light received by the optical sensor CdS decreases, its resistance value increases, and the voltage at point a increases, becoming larger than the threshold voltage of G1.

Also, while driving, the magnetic flux of the magnet M on the wheel is connected to the reed switch L.
Since S is turned off, reed switches I and S close their contacts. Since the capacitor C2 and the resistor R2 constitute a differentiating circuit, a pulse is applied to the input of the gate G1. Therefore, the input a of gate G1.

Since both b become H, the output of G1 becomes L. The output of the gate G1 remains low for the duration of the pulse applied to the input signal, and then immediately returns to high. Note that the resistor R1 is a discharge resistance of the capacitor C2, and the capacitor C4 is connected to prevent malfunctions due to noise and static electricity. Gate G,
When the output of gate G2 becomes L, gate G2
The output of transistor Q is H, and current flows to the emitter-base of transistor Q, resistor R4, and diode D.
, conducts. Since the capacitor C3 initially has a charge of 0, when the output of the gate G2 becomes H, the input of the gate G2 also becomes H, and the output of the gate G3 becomes L. This output is gate G2
Since it is fed back to the input of game 14. Even if the output of G2 returns to H, the output of G2 remains at H. Therefore, when the output of the gate G becomes H and the transistor Q1 becomes non-conductive, a charging current flows into the capacitor C3 through the resistor R6 and begins to be charged, and the input potential of the gate G3 gradually decreases. When this voltage becomes less than the threshold voltage of gate G5, the output of gate G3 becomes H, and this is fed back and both inputs of G2 become H. Therefore, its output becomes L, and the charge in the capacitor C3 is immediately absorbed into the output of the gate G2 and released. While the output of gate G3 is L, the base current of transistor Q2 flows through resistor 7, so transistor Q2 is conductive, and its collector current flows through resistor R8 to the base of transistor Q3, so transistor Q3 is conductive. Lamp L
lights up for a certain period of time (for example, 4 seconds).

Now, when the reed switch LS cuts off the magnetic flux and closes its contacts again within this certain period of time (for example, 4 seconds) due to the rotation of the wheel, a pulse is applied to the input of the gate G1, and the output of the gate G1 becomes L for the time of the pulse width. Therefore, the transistor Q1 conducts for this time, and the charge in the capacitor C5 is discharged through the emitter-collector of the transistor Q1 and the resistor R5. R5 is a resistor with a small resistance value for limiting the collector current of transistor q1. Therefore, game)G
When the output of 1 returns to H, the capacitor C5 starts to be charged again, that is, the one-shot multivibrator circuit is activated, and the lamp L is further turned on for a certain period of time (for example, 4 seconds). By repeating this, the lamp L lights up continuously, and finally turns off after a certain period of time (for example, 4 seconds) after the reed switch LS closes its contacts. If the lamp L becomes bright while it is on, and the voltage at the input a of the gate G1 falls below the threshold voltage, it will remain lit for only that cycle (for example, 4 seconds), but after the lamp L becomes bright, the gate G
1 input b [the applied pulse becomes invalid.

Effects of the Invention As described above, according to the present invention, a bright headlight can be obtained without putting a burden on the bicycle rider's leg strength, without requiring any operation, and maintenance requires only battery replacement. It is economical because it is used often, and it greatly contributes to traffic safety. In addition, in general, in order to stabilize the operation of lamps that automatically turn on and off depending on the surrounding brightness, hysteresis is usually provided in the illuminance when turning on and off. However, if hysteresis is provided, the lamp will operate with brighter illuminance when it is turned off than when it is turned on. Therefore, if the illuminance is appropriate when the lamp is turned on, the lamp remains lit until it is too bright when the lamp is turned off, which wastes the power battery. On the other hand, if the illuminance when the lights are turned off is set to the appropriate illuminance, the illuminance when the lights are turned on is too dark, making it dangerous to use as a bicycle headlight. However, in the present invention, there is no hysteresis between the illumination intensity when the lamp is turned on and the illumination intensity when the lamp is turned off, and the lamp operates accurately, so that the lamp can be turned on and off at an appropriate illuminance level without wasting the battery.

[Brief explanation of the drawing]

FIG. 1 is a T-son circuit diagram according to an embodiment of the light of the present invention. B...Power battery, M...Magnet, LS...
River/Reed switch, C... Capacitor, R...
...Resistor, G...NAND gate, Q
...Transistor, L...Lamp, C
dS: Light sensor, D: Diode.

Claims (1)

[Claims] A battery-powered bicycle light consisting of a retriggerable one-shot multivibrator circuit composed of a NAND gate and a transistor, which has a power battery, a light sensor, and a reed switch operated by a magnet.