JPH0238844Y2 - - Google Patents

Description

[Detailed Description of the Invention] <<Industrial Application Field>> This invention relates to a bicycle lighting device that can compensate for insufficient light intensity of the main lamp when the bicycle is traveling at low speed by lighting an auxiliary lamp.

<<Prior Art>> A bicycle lighting device can be simply constructed by having a generator that generates electricity by the rotation of the front wheel of the bicycle, and a lamp that is lit by the output of this generator. This configuration has the disadvantage that sufficient illuminance cannot be obtained due to a decrease in the electromotive force of the generator when the bicycle is traveling at low speed. Therefore, a battery such as a dry battery, an auxiliary lamp that is lit by the electric power supplied from the battery, and an auxiliary lamp lighting control section that controls the lighting of this auxiliary lamp are provided. Lighting devices that compensate for insufficient illuminance by turning on lights have been commercialized.

[Problems to be solved by the invention] However, the auxiliary lamp lighting control section in such a lighting device is mainly composed of a plurality of semiconductor elements, such as transistors, and therefore, the threshold of the semiconductor element
Since the voltage applied to the auxiliary lamp is reduced by the voltage, there is a problem that the luminous efficiency is poor. Further, there is a problem that the auxiliary lamp lighting control section requires a large number of parts and a large number of manufacturing steps, making it difficult to make the device smaller and cheaper.

This idea was devised in view of the above-mentioned problems, and its purpose is to employ a structure that can compensate for the lack of light intensity by lighting up the auxiliary lamp when the bicycle is running at low speed, while also providing light emission. It is an object of the present invention to provide a bicycle lighting device that is efficient, compact, and inexpensive by reducing the number of parts and manufacturing man-hours.

<Means for Solving the Problems> In order to achieve the above object, the bicycle lighting device according to the present invention includes a reed switch that forms the energization path for the auxiliary lamp, and a reed switch that is moved to the outer part of the reed switch. The reed switch has a magnetic body that can be installed to form an operating magnetic field for the reed switch, and an expandable member that is made of a shape memory alloy and that expands and contracts in accordance with the electromotive force of the generator to determine the amount of movement of the magnetic body. It constitutes an auxiliary lamp lighting control section.

<<Operation>> When the bicycle is running at low speed, the extensible and contracting action of the extensible member moves the magnetizing element to the operating area of the reed relay, and the reed relay closes, forming a current-carrying path for the auxiliary lamp. The lamp lights up.

On the other hand, when the bicycle is stopped or running at medium to high speeds, the extensible member moves the magnetic body to a non-operating area of the reed relay, and the reed relay opens and the auxiliary lamp goes out.

The above operation compensates for the lack of light intensity when the bicycle is running at low speed. According to the above configuration, the reed switch forms the energizing path for the auxiliary lamp, and unlike the conventional method, a semiconductor element is not used. Therefore, the threshold of the semiconductor element can be changed without loss due to voltage. , the auxiliary lamp can emit light efficiently. In addition, the auxiliary lamp lighting control section is mechanically and simply constructed, and is not composed mainly of multiple transistors, etc. as in the past, making it possible to reduce the number of parts and manufacturing man-hours. , it is possible to reduce the size and cost of the device.

<<Embodiments>> Hereinafter, preferred embodiments of the bicycle lighting device according to the present invention will be described with reference to the accompanying drawings.

The drawings show an embodiment of the invention.

As shown in the figure, the device of this embodiment has a generator G
1, main lamp 2, auxiliary lamp 3, battery 4, reed switch 5, magnetic body 6, guide roller 7, coil spring 8, elastic member 12, variable resistor
It has VR and diode D.

The generator 1 generates electricity when the bicycle runs, and the generated output is applied to the filament of the main lamp 2.

The auxiliary lamp 3 compensates for the lack of light intensity of the main lamp 2 when the bicycle is running at low speed, and the filament of this auxiliary lamp 3 is supplied with the DC voltage of the battery 4 via the reed switch 5. ing. This reed switch 5 is made by enclosing two ferromagnetic leads facing each other with a predetermined gap at one end in glass or the like.
This reed switch 5 forms an energizing path for the auxiliary lamp 3.

A magnet 6 forms an operating magnetic field for the reed switch 5, and is provided outside the reed switch 5 so as to be movable in the directions of arrows 13 and 14. A guide roller 7 is pivotally supported on the magnetic body 6, and an elastic member 12 is suspended from the guide roller 7.

The expandable member 12 is made of a shape memory alloy formed into a linear or band shape, and determines the amount of movement of the magnet 6 by expanding and contracting in accordance with the electromotive force of the generator. This telescopic member 12
Both terminals are locked to locking portions 10 and 11 having conductivity. The locking part 10 is connected to one output end of the generator 1 via the diode D and the variable resistor VR, and the locking part 11 is connected to the other output end of the generator 1, and is variable. resistor vr
By changing the resistance value of the elastic member 12, the current flowing through the elastic member 12 can be adjusted. Here, the shape memory alloy constituting the expandable member 12 stores a certain shape in advance and changes to the memorized shape when it reaches a predetermined temperature. be. In other words, as the temperature rises, it expands, and as the temperature falls, it contracts. As a result, the elastic member 12 is energized, and the more electricity is applied, the more it generates heat and stretches. When the telescopic member 12 is extended, the magnetic body 6 and the guide roller 7 will move in the direction of gravity (in the direction of the arrow 13) due to their own weight, but here, in order to accurately perform this movement,
A biasing member, such as a coil spring 9, retained by the locking portion 8 biases the magnetic body 6 in the direction of the arrow 13. An auxiliary lamp lighting control section 15 is constituted by the reed switch 5, the magnetic body 6, and the elastic member 12, and this is a feature of this embodiment.

Next, the operation of the above configuration will be explained.

When the bicycle is stopped, the main lamp 2 does not light up because the generator 1 does not generate electricity. At this time, the magnetizing body 6 is located within the area A (as shown), and in this state, the reed switch 5 is in the open state, so the auxiliary lamp 3 is not lit either.

Next, when the bicycle runs, the generator 1 generates electricity, and a current flows through the circuit according to the bicycle's running speed. Most of the current output by the generator 1 flows to the main lamp 2 and is used for emitting light from the main lamp 2, but a part of it flows to the expandable member 12 via the variable resistor VR and the diode D. The elastic member 12 generates heat due to this current, and expands due to this heat generation. As a result, the magnet generating body 6 moves in the direction of the arrow 13 together with the guide roller 7. This amount of movement is determined by the amount of heat generated by the expandable member 12, that is, by the electromotive force of the generator 1. When the magnetizing body 6 is located within the region B, the magnetic field formed by the magnetizing body 6 acts on the reed switch 5 and closes the reed switch 5, so that the DC voltage of the battery 4 is applied to the auxiliary lamp 3. This causes the auxiliary lamp 3 to light up. Therefore, by adjusting the variable resistor VR in advance so that the magnetizing element 6 is located within the region B when the bicycle is running at low speeds, the auxiliary lamp 3 can be turned on to compensate for the lack of light intensity of the main lamp 2 when the bicycle is running at low speeds. This can be supplemented by

Further, when the bicycle is traveling at medium to high speeds, the electromotive force of the generator 1 is large and the main lamp 2 provides sufficient illuminance, so there is no need to turn on the auxiliary lamp 3. For this reason, in this embodiment, the extensible member 12 is expanded during medium-high speed driving to position the magnetizing body 6 within the region C, and the auxiliary lamp 3 is turned off by opening the reed switch 5.

When the traveling speed of the bicycle decreases and the magnetic generator 6 is located within the area B again, the reed switch 5 is closed and the auxiliary lamp 3 is turned on again.

In this way, in the device of this embodiment, the auxiliary lamp lighting control section 15 is constituted by the reed switch 5, the magnetic body 6, and the telescoping member 12, and the telescoping action of the telescoping member 12 is actively utilized. The amount of movement of the magnet 6 is determined by this, and the reed switch 5 is opened/closed accordingly, and unlike the conventional method, a semiconductor element is not used, so there is no loss due to the threshold voltage of the semiconductor element. There is no
The auxiliary lamp 3 can be made to emit light efficiently. Further, since the auxiliary lamp lighting control section 15 is mechanically and simply configured, the number of parts and manufacturing steps can be reduced, thereby making it possible to reduce the size and cost of the device. Furthermore, since the extensible member 12 is stretched by urging the magnetic body 6 in the direction of the arrow 13 by a biasing member such as a coil spring 9, the movement of the magnetic body 6 can be performed accurately. It also has advantages.

It should be noted that the vibration of the magnetic body 6, especially the coil spring 9,
In order to prevent vibration in a direction perpendicular to the biasing direction (direction of arrow 13) caused by this, it is preferable to provide appropriate means such as a guide rail.

One embodiment of the present invention has been described above, but
The present invention is not limited to the above embodiments,
It goes without saying that various modifications are possible.

<<Effects of the invention>> As described above, the bicycle lighting device according to the invention employs a configuration that can compensate for the lack of illumination by lighting up the auxiliary lamp when the bicycle is running at low speed, while improving luminous efficiency. Moreover, by reducing the number of parts and manufacturing man-hours, it is possible to achieve smaller size and lower cost.

[Brief explanation of drawings]

The drawing is a circuit diagram showing an embodiment of the present invention. 1... Generator, 2... Main lamp, 3... Auxiliary lamp, 4... Battery, 5... Reed switch,
6... Magnetizing body, 12... Expandable member, 15... Auxiliary lamp lighting control section.

Claims (1)

[Scope of utility model registration request] It consists of a generator that generates electricity when the bicycle is running, a main lamp that lights up using the output of this generator, an auxiliary lamp that uses a battery as a power source to compensate for the lack of light from the main lamp when the bicycle is running at low speeds, and this auxiliary lamp. In a bicycle lighting device having an auxiliary lamp lighting control section that performs lighting control, the auxiliary lamp lighting control section is movably provided on a reed switch that forms an energization path for the auxiliary lamp and on an outside portion of the reed switch. The reed switch is characterized by having a magnetic body that forms an operating magnetic field of the reed switch, and an expandable member made of a shape memory alloy that expands and contracts in accordance with the electromotive force of the generator to determine the amount of movement of the magnetic body. Bicycle lighting device.