JPH04133943U - bicycle headlight device - Google Patents

Abstract

(57) [Summary] [Structure] A switching element 4 is connected in series to a headlight bulb 3b that is turned on by electric power from a bicycle generator 1.
This element 4 is turned off when the surroundings are bright and turned on when it is dark by a lighting control circuit 9 having a photosensitive element 5. This lighting control circuit 9 is operated by the electric power of the generator 1, and the photosensitive element 5 is turned off when the surroundings are bright. A bicycle headlight device installed in a position not affected by the light of a light bulb 3b. [Effect] The headlights can be turned on and off automatically according to the surrounding brightness, significantly improving driving safety, and does not require a separate power source such as a battery. Since it is attached to the headlight itself, it is convenient for electrical wiring within the headlight, and the overall cost is low and it can be made more compact.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a bicycle headlight device that lights a headlight using a generator.

0002

[Conventional technology]

Conventionally, bicycles have a generator that generates electricity by rotating the front wheel and a headlight that is directly connected to the generator. It is equipped with a power generating unit that can be raised up when driving at night. The generator rotates by tilting the machine over and pressing the generator's generation roller against the front tire. It generates alternating current power with a voltage proportional to the rotation, allowing safe driving.

0003 When driving during the day, there is no need to turn on the headlights, and in this case, you can turn on the generator. Stand up and keep the headlights off.

0004 By the way, when driving in the evening, turn on the headlights when it gets dark. If necessary, raise and lower the generator using so-called one-handed operation. It is necessary to turn on the lights, and in this case, you will be driving distracted with one hand, making it safer. There is a problem with not being able to drive.

[0005] In order to solve this problem, we need to detect the brightness of the surrounding area and use it when it gets dark. For example, there are devices that automatically turn on the headlights, such as in Japanese Patent Publication No. 52-47635 and in actual practice. This is known as seen in the publication No. 176038/1983.

[0006] However, in order to activate the detection circuit that detects the surrounding brightness, A power source separate from the generator (Battery 6 in Japanese Patent Publication No. 52-47635, Japanese Utility Model Publication No. 58-176038) However, this would require a storage battery, making the equipment large-scale and costly. There was a problem.

[0007]

[Problem that the idea aims to solve] The present invention was developed with this in mind, and the light automatically turns on when it gets dark. Of course, it is a compact bicycle headlight system with a simple configuration and low cost. The challenge is to provide a suitable location.

[0008]

[Means to solve the problem]

The headlight device of the present invention is a headlight equipped with a light bulb that is lit by the power generated by a generator. lamp and an ambient light receiver located in a position that is not affected by the light of the bulb of this headlamp. a photosensitive element that emits light; a switching element connected in series to the light bulb; and the generator. is activated by the generated power of The lighting control circuit is provided with a lighting control circuit that turns on the switching element when the switching element is turned on.

[0009]

[Effect]

According to the present invention, when it gets dark and the light receiving illuminance of the photosensitive element decreases below a predetermined value, The switching element turns on, so the headlights automatically turn on, and when it becomes bright, the lights turn on. Since the switching element is turned off, the light is automatically turned off.

0010 It also supplies power to the light bulb and the lighting control circuit that operates the switching element. Power is supplied by a generator, so no separate power source such as a battery is required. do not. In addition, a photosensitive element is installed in the headlight itself, which is not affected by the light from the bulb. Therefore, wiring of the electric circuit becomes easy.

[0011]

【Example】

Next, this invention will be explained in detail with reference to drawings showing one embodiment thereof.

0012 In Figure 1, 1 is a generator, and 2 is a rectifier circuit that rectifies the power generated by the generator 1. It is formed by a full-wave rectifier bridge circuit of diodes. 3b is one input The bulb of the headlight 3 whose terminal is connected to the positive output terminal p of the rectifier circuit 2, 4 is a switch The first transistor is an NPN type transistor forming a contacting element, and the collector is the other side of the light bulb 3b. is connected to the input terminal of the rectifier circuit 2, and its emitter is connected to the negative output terminal n of the rectifier circuit 2. .

[0013] 5 is a cadmium sulfide element (hereinafter referred to as cadmium sulfide element) whose resistance value decreases almost in proportion to the received light intensity. Cds), which forms a photosensitive element and whose one end is connected to the positive output terminal p. The other ends of both are connected to a negative output terminal n via a first resistor 6 for bias.

[0014] 7 is an NPN type second transistor, the collector of which is connected via a second resistor 8 for current limiting. is connected to the positive output terminal p, the emitter is connected to the negative output terminal n, and the base is connected to the positive output terminal p. It is connected to the connection point x between ds5 and the first resistor 6. 9 consists of the circuit configuration indicated by the broken line. The lighting control circuit is connected between the output terminals of the rectifier circuit 2.

[0015] In addition, Cds5 has a resistance value of 20MΩ and 20KΩ when the receiving illuminance is OLx and 10Lx, respectively. The resistance values of the first and second resistors 6 and 8 are 10KΩ and 500Ω. Each is set.

[0016] In addition, as shown in Fig. 2, the headlight 3 includes a light bulb 3b inside a case 3a, and a light bulb 3b in front of the light bulb 3b. A lens 3c is provided on the front side of the bicycle, and a mounting plate 3d protruding from the bottom of the case 3a is attached to the front holder of the bicycle body. attached to the top of the arc. Note that the light bulb 3b is, for example, 6V-3W (0.5A). Then, Cds 5 is installed in case 3a as shown in Figure 2 so as not to be affected by the light from bulb 3b. is attached to the top surface of the

[0017] Generator 1 is always tilted down and pressed against the front tires, and while driving, the front wheels rotate. As a result, AC generated power with a voltage proportional to the rotation is generated, and the positive voltage of the rectifier circuit 2 is - Direct current power with a voltage proportional to the voltage of the generated power is generated between the negative output terminals p and n.

[0018] On the other hand, the resistance value of Cds5 changes depending on the received light intensity, and the headlight 3 is turned on during the daytime etc. When there is no need to do so, that is, when the receiving illuminance is 10Lx or more, the resistance value of Cds5 is 20K. It becomes a low resistance value of Ω or less, and when it is necessary to turn on the headlight 3 at night, etc. While the received light illuminance is 10Lx or less, the resistance value of Cds5 becomes a high resistance value of 20KΩ or more.

[0019] When the resistance value of Cds5 becomes a low resistance value of 20KΩ or less while driving, the connection is made at this time. The voltage at the connection point x rises and the second transistor 7 is turned on. This turns off the first transistor 4.

[0020] On the other hand, if the resistance value of Cds5 becomes a high resistance value of 20KΩ or more while driving, the connection will be made at this time. The voltage at the connection point x decreases and the second transistor 7 is turned off. The first transistor 4 is turned on by the operation.

[0021] Therefore, while the ambient light is bright while driving and there is no need to turn on the headlights 3, The first transistor 4 is held off, and both the bulb 3b of the headlamp 3 and the rectifier circuit 2 are output. The power terminals p and n are disconnected and opened, and the headlight 3 is kept turned off.

[0022] On the other hand, when the ambient light while driving becomes dark and it becomes necessary to turn on the headlight 3, the first Transistor 4 turns on and the bulb 3b of the headlamp 3 and both output terminals p and n of the rectifier circuit 2 The gap is closed, the rectified output of the rectifier circuit 2 is supplied to the light bulb 3b, and the headlight 3 is turned on. Ru.

[0023] The headlights 3 are automatically turned on and off by turning on and off the first transistor 4. Because this is done in a consistent manner, there is no need to raise and lower the generator while driving, as was the case in the past. This significantly improves driving safety in the evening.

[0024] By the way, the power supply to the light bulb 3b and the power supply to the lighting control circuit 9 are both generated by power generation. A separate power source such as a battery is required to operate the lighting control circuit. Moreover, since the photosensitive element 5 is attached to the headlamp 3 itself, It is convenient for wiring electrical circuits, is generally cheaper, and is more compact. can.

[0025] Note that instead of using Cds5 as a photosensitive element, various photoelectric conversion elements such as solar cells can be used. Of course, children can be used.

[0026]

[Effect of the idea]

As described above, according to the bicycle headlight device of this invention, the function of the photosensitive element is The headlights 3 can be turned on and off automatically according to the surrounding brightness, making it easier to drive. In addition to significantly improving safety, there is no need for a separate power source such as batteries, and there is no need for photosensitive Since the element is attached to the headlight itself, it is convenient for electrical wiring inside the headlight, and the overall Therefore, the cost can be reduced and it can be made more compact.

[Brief explanation of drawings]

FIG. 1 is a circuit block diagram of the present invention.

FIG. 2 is a perspective view of the headlamp.

[Explanation of symbols]

1 Generator 3 Headlights 3b light bulb 5 Cadmium sulfide (photosensitive element) 4 First transistor (switching element) 9 Lighting control circuit

Claims (1)

[Scope of utility model registration request] 1. A headlamp including a light bulb that is lit by the power generated by a generator, and a photosensitive element that receives ambient light and is provided in a position of the headlight that is not affected by the light from the light bulb. ,
A bicycle comprising a switching element connected in series to the light bulb, and a lighting control circuit that is activated by the power generated by the generator and turns on the switching element when the illumination intensity received by the photosensitive element falls below a predetermined value. headlight device.