JPH04317879A - Tail lamp for bicycle - Google Patents

Abstract

PURPOSE:To dispense with switch operation and extend the service life of a battery by providing such a constitution as lighting a tail lamp only when the environmental brightness is lowered, and, also, an automobile approaches from the rear, and the light of the automobile is detected. CONSTITUTION:A tail lamp 4 has a first detecting means 15 for detecting the light of an automobile approaching from the rear, and a second detecting means 17 for detecting the environmental brightness. Only when the first detecting means 15 detects the light of the automobile from the rear and the second detecting means 17 detects that the environmental brightness is less than a standard value, the tail lamp 4 is lighted.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bicycle tail lamp.

0002

[Prior Art] Conventionally, a reflective plate has been attached to the rear mudguard of a bicycle in order to notify the presence of a faster-moving vehicle approaching from behind at night.
It is generally known to reflect headlights from vehicles behind the vehicle.

[0003] However, since this reflector type does not emit light by itself, the brightness is insufficient, and it does not function satisfactorily depending on the reflection angle, so it cannot be said to be a sufficient safety measure.

[0004] Therefore, there are battery type tail lamps that have a built-in battery or are attached externally. Since the tail lamp is turned on and off by a switch, there are problems in that the battery will run out quickly due to continuous lighting, and the battery will run out if you forget to turn off the switch when the vehicle is stopped, which poses practical problems. .

[0005]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, it is an object of the present invention to provide a tail lamp that can extend the life of the battery.

[0006]

[Means for Solving the Problems] The present invention has been made in view of the above circumstances, and provides a battery-powered bicycle tail lamp with a built-in battery or an externally attached battery, which can be used to illuminate vehicles from the rear. The first detection means detects the ambient brightness, and the second detection means detects the surrounding brightness.
The tail lamp is turned on only when the detection means detects the lights of a car or the like coming from behind and the second detection means detects that the surrounding brightness is below a reference value. .

[0007]

[Function] In the bicycle tail lamp configured as described above, the surrounding brightness is below the standard value, and
Only when the lights of a car etc. are detected from behind.
The tail lamp can be turned on.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 to 7.

1 is the bicycle body, 2 is this bicycle body 1
This is a battery case attached to the front pipe 3 of the machine. Reference numeral 4 denotes a tail lamp attached to the support rod 6 of the saddle 5, which is clamped and attached to the support rod 6 of the saddle 5 by a tail holder 7 as shown in FIG. Further, 8 is a brake portion fixed to the rear fork 9. As shown in FIG. 4, this brake part 8 is engaged with an actuation part 11 that operates in conjunction with the movement of the brake wire 10, and this actuation part 11 is connected to a microswitch 12 fixed to the rear fork 9. Switching operation piece 13
is connected to. Therefore, when the brake of the bicycle main body 1 is operated, the mile cross switch 12 is operated and the bicycle brake is operated.
lamp 4 lights up.

As shown in FIG. 1, the tail lamp 4 has a plurality of high-intensity light emitting diodes 13 arranged in a straight line to increase illuminance, and a lens 14 is disposed in front. . A first light receiving section 1 is located below the light emitting diode 13.
5 is provided, and the first light receiving section 15 uses an amorphous solar cell as an element. Further, a lens 16 is disposed in front of the light receiving surface of the element, and this lens 16
In order to focus the lights of cars etc. from behind,
A fisheye lens is used. The light receiving element may be not only an amorphous solar cell, but also a single crystal solar cell, a polycrystalline solar cell, CdS, and the like. Furthermore, as shown in FIG. 1, a second light receiving section 17 is provided on the back surface of the tail lamp 4, and CdS is used as the light receiving element. This second
The light receiving section 17 detects external light through a light receiving hole 19 formed on the back surface of the rear case 18 of the tail lamp 4, and is disposed inside the rear case 18. Then, the board 20 on which the light emitting diodes 13 are arranged is fixed with screws 21, and the front case 2 of the tail lamp 4 is fixed.
2 and the rear case 18 are fixed with screws 23.

Next, the operating circuit of the tail lamp 4 will be explained.

FIG. 7 is an operational circuit diagram of the tail lamp 4. 12 is a brake sensing switch (the above-mentioned microswitch 12). Reference numeral 13 denotes a light emitting diode, which is normally connected to the battery 24 in the battery case 2 and lights up when the brake sensing switch 12 is closed. That is, the tail lamp 4 normally lights up in response only to the operation of the brakes.

Reference numeral 25 denotes a CdS which is a light receiving element of the second light receiving section 17 that senses the brightness of the surroundings. When the brightness of the surroundings becomes dark, the resistance value of the CdS increases, and when the brightness falls below the reference value, Transistor 26 is turned on. In addition, 27 is an amorphous silicon solar cell, which generates an electromotive force when exposed to light from a car, etc., and transistor 2
8 is turned on. Therefore, the light emitting diode 13 lights up when the surrounding brightness becomes darker than the reference value and the light from a car or the like is illuminated from behind.

Furthermore, since the light-receiving element of the second light-receiving section detects the brightness of the surroundings, it is necessary to devise measures to prevent it from directly receiving the lights of automobiles, etc. There is a method in which a light-receiving element is placed inside the body case of the tail lamp and the surrounding brightness is detected through a light-receiving hole provided in the case. It is necessary to place it on the side so that it is not directly exposed to the lights of cars, etc.

[0015]

[Effects of the Invention] As is clear from the above description, the present invention turns on the tail lamp only when the surrounding brightness falls below the standard value and when the lights of a car or other vehicle are detected from behind. Therefore, there is no need to operate a switch, and the life of the battery can be extended.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the present invention.

FIG. 2 is a side view of a bicycle body equipped with a tail lamp.

FIG. 3 is a perspective view showing an embodiment of the present invention attached to a support rod of a saddle.

FIG. 4 is a perspective view showing the brake section.

FIG. 5 is a front view showing an embodiment of the present invention.

FIG. 6 is a rear view showing an embodiment of the present invention.

FIG. 7 is an electrical circuit diagram in one embodiment of the present invention.

[Explanation of symbols]

4　　　Tail lamp 13 Light emitting diode

Claims (3)

[Claims] [Claim 1] A battery-powered bicycle tail lamp with a built-in battery or an externally attached battery, comprising a first detection means for detecting lights from a car or the like coming from behind, and a second detection means for detecting surrounding brightness. means, and only when the first detecting means detects lights from a car or the like coming from behind and the second detecting means detects that the surrounding brightness is below a reference value, the test is performed. - A bicycle tail lamp characterized by lighting a tail lamp. 2. A bicycle tail lamp according to claim 1, wherein said second detection means is disposed on a side opposite to a side directly receiving the light of an automobile or the like. 3. The light-receiving element of the second detection means is disposed inside the case of the tail lamp, and detects surrounding brightness through a light-receiving hole provided in the case. A bicycle tail lamp according to claim 1.