JPH068113B2 - Bicycle lighting device - Google Patents

Description

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

(B) Conventional technology A conventional lighting device that uses a secondary battery and an illuminance detecting means in combination is also disclosed in, for example, Japanese Patent Application No. 59-169503, which is an application of our company. When driving the generator, or when driving the generator while driving in a relatively bright place such as a shopping street even at night, the brightness is detected and the headlight is not turned on. Is generated, the secondary battery is continuously charged, and as a result, the secondary battery becomes overcharged,
It had the drawback of exploding and leaking the electrolyte inside.

(C) Problems to be Solved by the Invention Therefore, an object of the present invention is to prevent the rechargeable battery from becoming overcharged when the headlight is not lit while driving the generator. .

(D) Means for Solving the Problems The present invention includes a generator, a headlamp, a secondary battery, and an illuminance detecting means connected in parallel with each other, and a resistor and a first resistor are provided between the headlamp and the generator. A parallel circuit is connected to the switch means and a second switch means that is opened only when the headlamp outputs a signal from the illuminance detecting means is connected in series, and the illuminance detecting means is provided at a predetermined brightness. From the illuminance detecting means and outputs the signal from the illuminance detecting means when the brightness is lower than a predetermined brightness, and the first switch means is closed. To do.

(E) Operation When the illuminance detection means detects a predetermined brightness, the headlight is turned off and the first switch means is opened to supply the power from the generator to the secondary battery through the resistor. is there.

When it is dark, the first switch means is closed, and the electric power from the generator is directly supplied to the headlight or the secondary battery via the first switch means.

(F) Example (1) is a bicycle equipped with a headlight (2) consisting of a light bulb (40) in the front part and a taillight (3) consisting of a light emitting diode in the rear part. ) And press it up and down freely
It is equipped with an alternator (5) that does not generate power at the position but generates power by the rotating force of this front wheel (4) in the “down” position, and the mudguard (7) at the rear wheel (6).
The taillight unit (9) is provided in which the taillight (3) is provided rearward, and the illuminance detection means (8), which is a solar cell for generating electricity by the sun rays (S), is provided upward.
A rechargeable secondary battery (10) is installed in the tail lamp unit (9).

In the present invention, the illuminance detecting means (8) may be any one that detects a predetermined brightness and outputs a signal.

Next, the electric circuit will be described. The generator (5), the headlight (2), the secondary battery (10) and the illuminance detecting means (8) are connected in parallel with each other. The generator (5) is full-wave rectified by a full-wave rectifier (11) including diodes (Da) to (Dd). The headlight
A second switch means (T ₂ ) composed of an NPN transistor is connected in series with (2) through a first diode (D ₁ ) for preventing backflow. A parallel circuit of a first resistor (R ₁ ) and a first switch means (T ₁ ) composed of a PNP transistor is connected between the headlight (2) and the generator (5). A second resistor (R ₂ ) is connected between the collector of the _second switch means (T ₂ ) and the base of the first switch means (T ₁ ). The base of the second switch means (T ₂ ) is the NPN type third transistor (T ₂ ).
₃ ) and the NPN type fourth transistor (T ₄ ) are connected to each other. The base of the third transistor (T ₃ ) is a PNP type fifth transistor (T ₅ ) and a PNP type sixth transistor (T ₅ ). T
It is connected to the connection point with ₆ ) via the third resistor (R ₃ ).
(R ₄ ) and (R ₅ ) are protective resistors. A first capacitor (C ₁ ) for charging and discharging is connected to the third resistor (R ₃ ). The base of the fourth transistor (T ₄ ) and the collector of the sixth transistor (T ₆ ) are connected via a sixth resistor (R ₆ ) having a large resistance value. In addition, a second capacitor (C ₂ ) for charging / discharging is connected between the base and the emitter of the fourth transistor (T ₄ ) and a second diode for preventing backflow is provided in parallel with the second capacitor (C ₂ ). The seventh resistor (R ₇ ) having a smaller resistance value is connected via (D ₂ ). Then connecting the base of the sixth transistor to these intermediate point (T ₆₎ with connecting the eighth resistor in parallel with the battery (10) (R ₈₎ and ninth resistor (R _9). (D ₃ ) is a third diode for preventing backflow.

FIG. 3 shows another embodiment in which a solar cell (8) is provided on the upper surface of the headlight (2).
Is provided.

Explaining the operation by such a configuration, first, in the daytime or at night, in a place with a predetermined brightness such as a shopping street, the generator
When driving (5), the fifth transistor (T ₅ )
And the third transistor (T ₃ ) are turned on and the illuminance detecting means (8) detects and outputs the brightness, and the sixth transistor
(T ₆ ) and the fourth transistor (T ₄ ) are turned on, so that the second switch means (T ₂ ) is turned off and the first switch means (T ₁ ) is also turned off.

As a result, the headlight (2) is turned off, and the electric power generated from the generator (5) is about to be charged in the secondary battery (10), but the first switch means (T ₁ ) is turned off. Therefore, the above-mentioned power supply is performed through the resistor (R ₁ ), and the power supplied to the secondary battery (10) decreases, so that the charging of this secondary battery (10) becomes overcharged. There is no.

If the illuminance detecting means (8) is a solar cell, the secondary battery (10) can be charged from this solar cell.

Next, when traveling to a dark place at night, the output from the illuminance detection means (8) is lost, so that the sixth transistor (T ₆ ) and the fourth transistor (T ₄ ) are turned off, and the fifth transistor (T ₅ ) And the third transistor (T ₃ ) are ON, and therefore the second switch means (T ₂ ) and the first switch means (T
₁ ) turns on. Therefore, when the charge amount of the secondary battery (10) is low, the headlamp (2) is directly turned on by the output from the generator (5) via the first switch means (T ₁ ) and the secondary battery ( 10) Charge.

When the charge amount of the secondary battery (10) is sufficiently high, the headlight (2) is turned on by receiving power supply from the generator (5) and the secondary battery (10).

(G) Effect of the Invention Since the present invention has such a configuration, even if the illuminance detection unit detects a predetermined brightness to turn off the headlight and drive the generator, Since the power is supplied to the secondary battery through the resistor, the secondary battery is not overcharged, and in a dark place, the generator is directly connected to the headlight through the first switch means without using the resistor. Since the power is supplied from the device, the lighting efficiency will not be affected by this resistance.

[Brief description of drawings]

FIG. 1 is a schematic view of a bicycle equipped with the lighting device of the present invention, and FIG.
FIG. 3 is an electric circuit diagram, and FIG. 3 is a schematic diagram showing another embodiment. (2) ... Headlight, (5) ... Generator, (8) ... Illuminance detection means, (10)
... secondary battery, (R ₁ ) ... resistance, (T ₁ ) ... first switch means, (T
₂ ) ... Second switch means

Claims (1)

[Claims] 1. A generator, a headlamp, a secondary battery and an illuminance detecting means are connected in parallel to each other, and a parallel circuit of a resistor and a first switch means is connected between the headlamp and the generator. A second switch means is connected in series with the headlight and is opened only when a signal is output from the illuminance detecting means. When the predetermined brightness is reached, a signal is output from the illuminance detecting means and the first switch is provided. Open the switch means,
A bicycle lighting device characterized in that when the brightness is lower than a predetermined level, the output of the signal from the illuminance detecting means is stopped and the first switch means is closed.