JPH04143132A - Lighting device for bicycle - Google Patents

Abstract

PURPOSE:To obtain sufficient brightness with small man power, by generating electric power with a small power generating means such as a small power dynamo or the like, charging a capacitor with the electric power and charging and discharging the capacitor under specified charging and discharging periods. CONSTITUTION:When an AC current is generated by the rotation of tires with a small power dynamo 1, the AC current is full-wave rectified with a rectifying circuit 31 in a power supply circuit 3, and applied to a capacitor 32 to charge it. At the same time, a multivibrator 33 is vibrated by the charging voltage of the capacitor 32 and the pulse signals are inputted to a capacitor C31 in a switching circuit 34, then the capacitor C31 generates rapid rising positive trigger pulses at the rise time of the pulse signals and rapid falling negative trigger pulses at the fall time of the pulse signals. These positive and negative trigger pulses are applied to the gate of a thyristor SCR to turn on and off it repeatedly, thereby a head lamp 2 can be turned on and off to obtain continued brightness because of afterimage phenomena.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bicycle lighting device for lighting a lamp mounted on a bicycle.

(Prior Art) Conventionally, lamps such as bicycle headlights are lit by electricity generated by a generator such as a dynamo or by supplying current from a dry cell battery when riding at night.

In addition, if you turn on the headlights when riding during the day, such as the Bites, you can alert other people such as other cyclists, car drivers, or pedestrians that you are riding a bicycle, thereby increasing your safety while riding. can.

(Problem to be solved by the invention) However, in the case of a normal generator type, the rotor of the generator is rotated by friction with the tires to generate electricity, and the lamp is constantly lit, which requires a lot of effort. was needed.

In addition, even if the lamp is battery-powered, the lamp is always on, which causes the battery to run out quickly, resulting in high running costs.

Therefore, the inventions as claimed in claims 1 to 3 have been made in view of the above-mentioned problems, and the object thereof is to provide a bicycle lighting device that can ensure safety while riding with less labor and reduced running costs. It is about providing.

(Means for Solving the Problems) In order to solve the above problems, the invention according to claim 1 provides a bicycle lighting device that lights up a lamp mounted on a bicycle, in which a small amount of electric power is used in rotating parts such as tires and pedals. A small power generating means such as a small power dynamo, a capacitor for charging and discharging the power generated by the small power generating means, and a charging/discharging cycle of the capacitor are set, and the capacitor is charged based on the charging/discharging cycle. The device is characterized by comprising a multivibrator for discharging, and a switching means for switching between a conductive state or a cutoff state between the capacitor and the lamp according to a charging/discharging cycle set by the multivibrator. .

Moreover, in order to solve the above-mentioned problem, the invention according to claim 2 is the bicycle lighting device according to claim 1, characterized in that the small power generation means is a solar cell.

Furthermore, in order to solve the above problem, a third aspect of the present invention provides the bicycle lighting device according to the first aspect, wherein the small power generating means is a dry battery.

(Function) In the invention according to claim 1, first, the capacitor is charged with electric power generated by a small power generating means such as a small force dynamo. This capacitor is then repeatedly charged and discharged according to the charging and discharging cycle set by the multivibrator.

At this time, the switching means switches between the conductive state and the disconnected state between the capacitor and the lamp based on the charging/discharging cycle set by the multivibrator.

That is, when the capacitor is discharging, the capacitor and the lamp are brought into conduction, and when the capacitor is being charged, the capacitor and the lamp are cut off.

Therefore, the lamp repeatedly turns on and off intermittently in synchronization with the charging and discharging of the capacitor.

Furthermore, in the inventions set forth in claims 2 and 3, the capacitor charges and discharges power generated by a solar cell and a dry cell as small power generation means, respectively, and as in the invention set forth in claim 1, the capacitor The lamp repeatedly turns on and off intermittently in synchronization with charging and discharging.

<Example> Hereinafter, an example of a bicycle lighting device according to the present invention using a headlamp (hereinafter referred to as a headlamp) will be described.

FIG. 1 is a circuit diagram showing the configuration of this device, which can be used as a small power generation means to generate electricity with little effort.
This is based on the premise of using the so-called small power dynamo 1, which has a low power generation capacity and has been developed very recently. The headlamp 2 includes a brightness type headlamp 2 and a power control circuit 3 that is interposed between the small power dynamo 1 and the headlamp 2 and controls power supply from the small power dynamo 1 to the headlamp 2.

The small power dynamo 1 generates alternating current, and has a resistor RD having a relatively high internal resistance so that the generated voltage is about 6V.

In addition, as shown in the figure, the power control circuit 3 includes a rectifier circuit (RFC) 31 that rectifies the input alternating current generated by the small power dynamo 1, and a rectifier circuit (RFC) 31 that rectifies the output current that is rectified by the rectifier circuit 31. A capacitor 32 that discharges, a multivibrator 33 that sets the charging/discharging cycle of the electric power charged in this capacitor 32 using a pulse signal, and a multivibrator 33 that sets the charging/discharging cycle of the electric power charged in this capacitor 32 using a pulse signal; It has a switching circuit 34 as a switching means for switching between a conductive state and a cutoff (non-conductive) state.

The full-wave rectifier circuit 31 includes a diode DI-D as shown in the figure.
It is a bridge type using 4 units.

As shown in the figure, the multivibrator 33 is an unstable multivibrator that uses capacitors C1l and C21 as coupling elements.The voltage across the capacitor 32 is applied as the operating voltage of this circuit, and the It is configured to output a pulse signal with a predetermined period.

That is, this multivibrator 33 has a capacitor C
1l, along with C21, a pnp transistor Tri
, Tr2, and the base of the transistor Trl is connected to the capacitor C21, while being grounded via the resistor R13. Further, the collector of the transistor Tri is similarly grounded, and the emitter is connected to the capacitor C1l via a resistor R12, and to the positive side of the capacitor 32 via a resistor R11.

On the other hand, the base of the transistor Tr2 is grounded via the resistor R23 and connected to the capacitor C1l,
The collector is also grounded. In addition, the transistor Tr2
The emitter of is connected to a capacitor C21 via a resistor R22, and is connected to the positive side of a capacitor 32 via a resistor R21.

Moreover, the switching circuit 34 is a multivibrator 33
According to the pulse signal output from the small force dynamo 1
and a thyristor SCR that switches between the power supply side of the capacitor 32 and the headlamp 2 into a conductive state or a disconnected state, that is, an on state or an off state.

In other words, this switching circuit 34 connects the power supply side and the headlamp 2 side through the anode and cathode of the thyristor SCR, and starts operation in response to a pulse signal from the multi-by-break 33 at the gate of the thyristor SCR. And the stop trigger pulse is resistor R31,
Capacitor C3 is divided by R32 and connected manually.
1 is provided.

However, the capacitance of the capacitor C31 is made much smaller than the capacitance of the capacitor C21 so that the trigger pulse can be generated by the capacitor C31.

Next, the operation of the illumination device for cyclists configured as described above will be explained with reference to the drawings.

First, the small power dynamo 1 generates alternating current by rotating a tire, for example.

This alternating current is input to the rectifier circuit 31 of the power supply circuit 3.

Since the rectifier circuit 31 is a bridge type using a diode Di-D4, a full-wave rectified current in which both positive and negative waves of the alternating current are rectified is output.

Therefore, the capacitor 32 is charged with the rectified output current. At this time, the capacitor 32 is charged in the form of a direct current voltage with less ripple due to the smoothing effect of charging and discharging.

At the same time, the multivibrator 33 oscillates using the charging voltage of the capacitor 32 as an operating voltage, and a pulse signal is output from the multivibrator 33.

The pulse signal output from this multivibrator 33 and input to the switching circuit 34 is shown in FIG.
As shown in a), the pulse width τ■ and the period T are respectively τ1=c21−R22 T=(C21·R22+C11ΦR12).

Next, this pulse signal is applied to the capacitor C31 of the switching circuit 34, and in response to the pulse signal, the capacitor C31 generates a positive trigger pulse that rises rapidly at the rising edge of the H/L/S signal, like a differential circuit. However, when the pulse signal falls, a negative trigger pulse that falls rapidly is generated.

Then, these positive and negative trigger pulses are connected to the resistor R31゜R3
The voltage is divided by 2 and applied between the gate and cathode of thyristor SCH, and thyristor SCR repeats conducting and non-conducting, switching between the capacitor 32 and the headlamp 2 into a conducting state or a cutoff state, and turning on the headlamp 2. and turn off the lights.

That is, when a positive trigger pulse is manually applied to the thyristor SCR and a gate current of 1 g flows, a forward current It flows from the anode side to the cathode side and conducts, thereby switching the headlamp 2 and the capacitor 32 into a conductive state.

After the positive trigger pulse is input, the thyristor SCR continues until the next negative trigger pulse is input, that is, h1 of the pulse signal output from the multivibrator 33.
At the gh level, the conductive state is maintained.

Therefore, during this conductive state, the capacitor 32 is connected to the headlamp 2 and discharges with discharge characteristics as shown in FIG. 3, causing the headlamp 2 to light up.

Further, when a negative trigger pulse is applied to the thyristor SCR and a gate current Ig in the opposite direction flows, the thyristor SCR becomes non-conductive, and the connection between the headlamp 2 and the capacitor 32 is switched to a non-conductive state.

The non-conducting state between the headlamp 2 and the capacitor 32 remains until the next positive trigger pulse is input, that is, when the pulse signal output from the multivibrator 33 is
Retained during ow level.

Therefore, while the headlamp 2 is turned off, the capacitor 32 is not discharged but is charged with the electric power generated by the small power dynamo 1 and rectified by the rectifier circuit 31 with the charging characteristics shown in FIG.

Therefore, in synchronization with the pulse signal as shown in FIG. 4(a) output from the multivibrator 33, the capacitor 32 repeats charging and discharging as shown in FIG. 4(b), while the thyristor SCR is turned on and off. Repeating the non-conducting state,
As shown in FIG. 4(C), the headlamp 2 is turned on at time t1 when the capacitor 32 is discharging and turned off at time t2 when it is being charged, and can be repeatedly turned on and off intermittently at minute time intervals.

As a result, with this device, sufficient brightness can be obtained when the lights are on, and even though no power is consumed by the headlamp 2 when the lights are off, as shown in Figure 4(c), the afterimage phenomenon when the lights are on makes it difficult to drive the car. Since the vehicle appears bright and provides continuous brightness to the eyes of the driver or other passersby such as pedestrians, it is possible to maintain the same level of safety during night driving as in the past, despite requiring little effort.

In addition, a capacitor C constituting the multivibrator 33
By changing the capacitance of C21 and the values of resistors R22, R12, etc., the pulse width ratio (duty) in the pulse signal can be adjusted.
cycle ), it is possible to obtain a ratio between the lighting time tl and the lighting time t2 that is optimal for the power generation capacity of the small power dynamo 1.

In other words, the ratio between the lighting time t1 and the light-off time t2 of the headlamp 2 is: tl : t2 = C21R222Cll
-R12, so for example, if R12=R22,
tl: t2 = C21: cu, and by changing the capacitance of the capacitors C21 and C1l according to the power generation capacity of the small power dynamo 1, the ratio between the lighting time 11 and the lighting time t2 can be changed to an optimal value.

In addition, in Fig. 1, a solar cell with a generally low power generation capacity is used instead of the small power dynamo 1, and the on time and light off time are controlled by resistors and capacitors that constitute the multivibrator 33 to match the power generation capacity. By changing the ratio to an optimum value, it is possible to construct a bicycle lighting device that requires no labor and does not require running costs.

Therefore, if you use this bicycle lighting device that uses solar cells during daytime riding when the sun is out, the headlamp 2 will automatically turn on and off at minute intervals, eliminating the need for labor and It is possible to inform others such as other passersby and pedestrians that the bicycle is running without incurring running costs, making it ideal for ensuring safety during daytime riding.

In addition, if a storage battery or the like is charged with electricity generated by a solar cell during the daytime, and the electricity from the storage battery is charged and discharged by the capacitor 32 when driving at night, the headlamp 2 will repeatedly turn on and off. Safety can also be ensured when driving at night.

Furthermore, even if a dry battery is used in place of the small power dynamo 1 in FIG.
Since the lights are turned off repeatedly, as shown in FIG. 4(C), the average power consumption is reduced compared to the conventional one, and the life of the dry cell is increased, that is, the running cost is reduced, and safety during driving can be ensured.

In this embodiment, a headlamp was used as an example.
Of course, a lamp installed at the rear or side of the bicycle may also be used.

Furthermore, in this embodiment, the multivibrator 33 is
However, in the present invention, any type of multivibrator may be used, such as a monostable or bistable multivibrator, or an astable multivibrator using a pnp transistor, or a thyristor or the like for the transistor TR2. May be used.

(Effects of the Invention) As explained above, in the invention set forth in claim 1, power is generated by a small power generating means such as a small power dynamo with a low power generating capacity, the generated power is charged into a capacitor, and the multivibrator is used to set the The capacitor is charged and discharged at the specified charge and discharge cycle, and the lamp is lit and discharged at the same charge and discharge cycle.
Since the light is turned off repeatedly and continuous brightness is obtained due to the afterimage phenomenon, it is possible to obtain a brightness equal to or higher than that of the conventional system even with a small amount of effort, which is extremely beneficial for traffic safety.

In addition, in the invention as claimed in claim 2, a solar cell, which generally has a low power generation capacity, is used as the small power generation means, but the ratio between the on time and the light off time is adjusted by a multivibrator to match the power generation capacity. By changing the lamp to an optimal one and having the lamp turn on and off repeatedly, it is possible to notify others such as other passers-by and pedestrians that the bicycle is being ridden during the daytime without any labor or running costs. I can,
Safety can be ensured.

Furthermore, in the invention according to claim 3, a dry cell battery is used as the small power generation means, and the capacitor charges and discharges the power supplied from the dry cell battery at a charging/discharging cycle set by a multivibrator, so that the headlamp 2 is turned on. Since the lights are turned off repeatedly, the average power consumption is reduced compared to conventional systems, and the life of the dry cell battery is extended, which reduces running costs and ensures safety during driving.

[Brief explanation of drawings]

Figure 1 is a circuit diagram showing an embodiment of the lighting device for cyclists according to the present invention, Figure 2 is a characteristic diagram showing the charging characteristics of the capacitor used in this example, and Figure 3 is the discharge characteristic of the same capacitor. Figure 4 (a) is a waveform diagram showing the pulse signal output from the multivibrator, Figure 4 (b) is a characteristic diagram showing the charging and discharging characteristics of the capacitor, and Figure 4 (c) is the waveform diagram showing the pulse signal output from the multivibrator. FIG. 3 is a characteristic diagram showing power consumption. 1... Small power dynamo (small power generation means) 2... Headlamp (lamp) 32... Capacitor 33... Multivibrator 34... Switching circuit (switching means) Patent applicant
Shojiro Takatani Patent Attorney Kazu1) Formation Rule Diagram (Actual Act ff18!' + 7'' Usage Fee Continuously Filled tn
ax Hoi Ginsha En) Fig.

Claims (1)

[Scope of Claims] 1. A bicycle lighting device that lights up a lamp mounted on a bicycle, which comprises: a small power generation means such as a small power dynamo that generates a small amount of power in a rotating part such as a tire or pedal; a capacitor that charges and discharges the power generated by the power generation means; a multivibrator that sets a charging and discharging cycle of the capacitor and charges and discharges the capacitor based on the charging and discharging cycle; and a charging and discharging cycle set by the multivibrator. A bicycle lighting device characterized in that it is provided with a switching means for switching between the conductive state and the cutoff state between the capacitor and the lamp according to the above. 2. The bicycle lighting device according to claim 1, wherein the small power generation means is a solar cell. 3. The bicycle lighting device according to claim 1, wherein the small power generation means is a dry battery.