JPS6157234B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bicycle display device that can display the speed of the bicycle and the number of gears of the transmission in a bicycle equipped with a multi-speed transmission.

Conventional bicycle indicators used light-emitting diodes to display the bicycle's speed in zones, but because the light-emitting diodes consume a large amount of current, it was not possible to keep the light-emitting diodes on all the time. First, if the light emitting diode were to be turned on all the time, the power source battery would be consumed quickly.

In view of the above conventional problems, the present invention displays the speed of the bicycle in zones on a liquid crystal display and the number of gears of the transmission on the liquid crystal display, thereby reducing the consumption of the power supply battery. The liquid crystal body equipped with two liquid crystal displays is a transmissive type and a reflective type, and by installing a light source lit by a small generator on the back side of this liquid crystal body, it functions as a reflective type liquid crystal body during the day. The display is clearly visible, and at night, a light source powered by a small generator is turned on to act as a transmissive liquid crystal, making the display clearly visible.

Hereinafter, one embodiment of the present invention will be described based on the accompanying drawings. FIG. 1 shows a block diagram of the electronic circuit in the bicycle display device of the present invention.
is a small generator that is driven by the wheels of a bicycle and serves as a speed sensor.The alternating current voltage generated by this small generator 1 is rectified by a rectifier circuit 2 to generate a direct current voltage proportional to the speed of the bicycle. Reference numeral 3 denotes a voltage comparison circuit that compares the DC voltage generated in the rectifier circuit 2 with a reference voltage in the reference voltage generation circuit 4, and outputs an output if the DC voltage is higher than the reference voltage.This voltage comparison circuit 3 is an operational amplifier. Or it consists of a comparator. Further, the reference voltage generation circuit 4 divides the voltage generated using V _BEO of a transistor (not shown) into eight to obtain a reference voltage. The voltage comparator circuit 3 also compares the reference voltage with the DC voltage generated by the rectifier circuit 2, and when the DC voltage is higher than the reference voltage, its output becomes H, and when it is lower, it becomes L. This H or L output is given to an exclusive OR gate 5, and the output of the exclusive OR gate 5 drives a liquid crystal display 6 that displays the speed in zones.

A liquid crystal display 7 displays the number of gears in the transmission, and this liquid crystal display 7 displays the number of gears corresponding to the position of a gear selector switch 8 whose movable contact slides in conjunction with the transmission. 9 is a liquid crystal drive oscillation circuit, and this oscillation circuit 9 generates approximately 60 Hz using an inverter. 1
0 is a buzzer drive oscillation circuit, and this oscillation circuit 10 generates approximately 3.8KHz using an inverter. 11
is a segment blinking circuit that blinks the 30 part of the liquid crystal display 6 which displays the speed zone when the speed of the bicycle reaches 30 km/h, and this segment blinking circuit 11 generates a 2Hz signal by an inverter.

12 is a buzzer, and this buzzer 12 is the first
It is connected to the voltage comparison circuit 3 via the AND gate 13 and the buzzer switch 14, and the exclusive RO
Connected to gate 5. Also, the first
The AND gate 13 is connected to the buzzer drive oscillation circuit 10 via the second AND gate 15, and is also connected to the segment flashing circuit 11.
The segment flashing circuit 11 also has a third segment flashing circuit 11.
It is connected to the exclusive OR gate 5 via an AND gate 16, and the third AND gate 16 is connected to the voltage comparison circuit 3. Further, the liquid crystal drive oscillation circuit 9 is connected to the exclusive OR gate 5. 17
is a power supply battery, and this power supply battery 17 is connected to the rectifier circuit 2 via a monitor switch 18 and a resistor 19.

Figure 2 shows a pattern diagram of the liquid crystal display 6 that displays the speed of the bicycle in zones, and the liquid crystal display 7 that displays the number of gears in the transmission. 2
It is displayed in 8 segments of 5 and 30, and the number of gears of the transmission is 6. This figure 2 shows the bicycle traveling at a speed of 15 km/h, and in this state, out of the 8 segments, the segments showing speeds of 3, 5, 8, 10, and 15 km/h are It is in the on state. Also, the transmission is shown in four gears.

FIG. 3 shows a liquid crystal display 20 equipped with a liquid crystal display 6 for speed display and a display 7 for displaying the number of gears.
The liquid crystal body 20 is provided with legs 22 on the back surface, and by being attached to the printed circuit board 21 via the legs 22, the printed circuit board 21 and the liquid crystal body 20 can be connected to each other. A space 23 is formed between them. Reference numeral 24 denotes a light source such as a lamp located in the space 23 and attached to the printed circuit board 21, and this light source 24 is turned on using the small generator 1 as a power source. Further, the liquid crystal body 20 is of a transmissive type and a reflective type.

The operation in the above configuration will be explained. Figure 2 shows a bicycle traveling at a speed of 15 km/h, but from this state the speed of the bicycle increases.
At 25 km/h, the output of the operational amplifier or comparator that constitutes the voltage comparator circuit 3 becomes H.
In addition, due to the functions of the buzzer drive oscillation circuit 10 and the segment flashing circuit 11, the buzzer 12 is activated via the second AND gate 15 and the first AND gate 13.
Blows intermittently. This arouses the driver's attention. In this case, the buzzer switch 14
is closed, and if you do not want the buzzer 12 to sound, you can open the buzzer switch 14.

The speed of the bicycle further increased to 30km/h.
When this happens, the output of the operational amplifier or comparator that constitutes the voltage comparator circuit 3 becomes H, and the segment flashing circuit 11 causes the LCD to display the speed of the bicycle in zones through the third AND gate 16 and the exclusive OR gate 5. The 30 km/h segment on the display 6 is displayed blinking. This allows the driver's attention to be further ventilated.

Furthermore, since the liquid crystal display 20 equipped with the two liquid crystal displays 6 and 7 is of a transmissive and reflective type, it functions as a reflective liquid crystal during the day, making the display clear. 20
Since a light source 24 that is turned on using the small generator 1 as a power source is provided on the back side of the liquid crystal body 20, the amount of light incident on the liquid crystal body 20 is reduced. That is, when it gets dark, the light source 24 is turned on by the small generator 1 to illuminate the liquid crystal body 20, so that the display becomes clear.

Further, when the monitor switch 18 is turned on, the voltage of the power supply battery 17 is applied to the rectifier circuit 2 through the resistor 19, and the output of the rectifier circuit 2 is input to the voltage comparator circuit 3. Therefore, if the voltage of the power supply battery 17 drops below the final voltage in this state, the value of the resistor 19 should be determined so that the 30 km/h segment will not turn on.
By pressing the monitor switch 18, it is possible to determine whether the voltage of the power supply battery 17 is above the final voltage or below the final voltage.

It should be noted that if multi-color liquid crystals are used for the liquid crystal displays 6 and 7 in the above embodiment, the display will be more easily visible and will serve as a speedometer/gear stage indicator.

As described above, according to the present invention, the speed of the bicycle is displayed in zones on the liquid crystal display, and the number of gears of the transmission is displayed on the liquid crystal display. It consumes less power battery compared to the above, and the liquid crystal display equipped with the two liquid crystal displays is of a transmissive and reflective type, and is lit by a small generator on the back side of the liquid crystal display. Because it is equipped with a light source, the liquid crystal acts as a reflective liquid crystal during the day, making the display clear, and at night, a light source powered by a small generator lights up to illuminate the liquid crystal. Since this liquid crystal acts as a transmissive liquid crystal, the display becomes clearer.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the electronic circuit in the bicycle display of the present invention, Figure 2 is a pattern diagram of the liquid crystal display that displays the speed of the bicycle in zones, and the liquid crystal display that displays the number of gears in the transmission. FIG. 2 is a perspective view showing a configuration in which a liquid crystal body equipped with two liquid crystal displays is attached to a printed circuit board. 1... Small generator, 2... Rectifier circuit, 3... Voltage comparison circuit, 4... Reference voltage generation circuit, 5... Exclusive OR gate, 6, 7... Liquid crystal display, 2
0...Liquid crystal.

Claims (1)

[Claims] 1. A small generator that is driven by a bicycle wheel and serves as a speed sensor, a rectifier circuit that rectifies the AC voltage generated by this small generator to generate DC voltage, and the DC voltage generated by this rectifier circuit and a reference. A voltage comparison circuit that compares the reference voltage in the voltage generation circuit and outputs an output if the DC voltage is higher than the reference voltage, and a voltage comparison circuit that is driven by the output of this voltage comparison circuit through an exclusive OR gate and displays the speed in zones. and a liquid crystal display that displays the number of gears corresponding to the position of a gear changeover switch whose movable contact slides in conjunction with the transmission, and the liquid crystal display equipped with the two liquid crystal displays is a transmissive type, A bicycle display device that uses a dual-purpose reflective type display device, and has a light source lit by the small generator on the back side of the liquid crystal display device.