JP2007066543A - Small revolving light - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a small revolving light using a brushless motor which can be made small in size compared with a conventional revolving light and in which the number of revolution of the motor can be reduced without causing a noise and also a long life is realized. <P>SOLUTION: A penetrating shaft 8 of cylindrical shape is used as a shaft of a brushless motor and an LED 3 is built in the cylinder part. A base 2a of a reflector 2 is installed at the upper part of a rotor 4. The light emitted from the penetrating shaft 8 is reflected by a revolving reflector 2 and emitted to each direction in the surrounding. By the above construction, a down-sized revolving light with small noise can be realized. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a small rotating light by a brushless motor that rotates and outputs a light beam to a peripheral portion.

Around the light source that emits light in all directions, a rotating light that emits light while rotating it in all directions has been put to practical use by rotating a reflector that shields about 2/3 of the entire circumference. It is provided. Since this has a structure in which the reflector is rotated around the light source, there is a limit to miniaturization.
Further, since the speed at which light is actually rotated is slower than the rotational speed of the motor, a transmission such as a reduction gear is necessary, and noise generated from the transmission increases, resulting in a short life.

Patent document 1 is an example which shows an example of the optical rotation apparatus of the said type.
The reflector 2 is disposed outside the lamp 1 attached at the center position in the cover 82. The reflector 2 is connected to the pin of the gear G2, and rotates around the lamp 1 by the rotation of the gear G2. A stepping motor 3 is attached to the lower surface of the base plate 4 and its output shaft is connected to the gear G1. The gear G1 meshes with the gear G2, and the speed reduction mechanism 2 is configured.
The high-speed rotation of the motor is decelerated, and approximately half of the light from the lamp 1 is blocked and emitted to the surroundings.
JP-A-11-346456

  By the way, when a rotating light is used, regardless of the purpose and function thereof, any device needs to be small in size without being restricted by the installation location. For example, in a security system in which a rotating light is installed in or around a building to give a warning or the like, if the security device is small, it can be easily attached at a required location. Also, the operation sound is required to be quiet and have a long life.

  An object of the present invention is to provide a compact rotating light by a brushless motor that can be made smaller than a conventional rotating light, can reduce the number of rotations of the motor without generating noise, and can achieve a long life. It is in.

In order to achieve the above object, claim 1 of the present invention includes a cylindrical penetrating shaft, a light source mounted in the cylindrical penetrating shaft so as to emit light from an opening in an upper portion of the cylinder, and A bearing fixed to the penetrating shaft, a rotor fixed to the bearing, and a reflecting plate having a base portion disposed on the periphery of the upper surface of the rotor so that the reflecting surface is positioned at a predetermined angle on the opening of the upper part of the cylinder; And a magnetic circuit formed by a permanent magnet and a coil, and a drive circuit that rotationally drives the rotor by controlling the current flowing through the coil, and the light is rotated around and emitted by rotating the reflecting plate. It is characterized by that.
A second aspect of the present invention is characterized in that, in the first aspect of the present invention, the light source is an LED.
A third aspect of the present invention is characterized in that in the first or second aspect of the present invention, a lens is provided in front of the light source to converge or diffuse light rays.
According to a fourth aspect of the present invention, in the first, second, or third aspect, the predetermined angle is approximately 45 degrees, and the angle of the light that is reflected and redirected by the reflecting plate is a substantially right angle direction. It is characterized by that.
According to a fifth aspect of the present invention, in the first, second, third, or fourth aspect of the invention, the drive circuit includes an adjusting unit that adjusts the rotational speed of the rotor.

  According to the above configuration, the rotating light can be made small and thin, and the rotation speed can be easily adjusted without causing noise, and the life of the apparatus itself can be extended.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a sectional view showing an embodiment of a small rotating light according to the present invention.
LED3 is installed in the upper part in the cylindrical penetration shaft 8 in which the shaft of a brushless motor has an opening part. Light is emitted in the axial direction.
The through shaft 8 is fixed to the inner ring of the bearing 10, and the rotor 4 is fixed to the outer ring of the bearing 10. The through shaft 8 is press-fitted and fixed to the housing 7. A coil spring 12 is inserted between the lower bearing 10 and the housing 7.

A magnet 5 is attached to the lower portion of the rotor 4, and a coil 6 is disposed at a position facing the magnet 5. When a current is passed through the coil 6, a magnetic circuit is formed with the magnet 5, and the rotor 4 is rotated.
A reflector 2 is installed on the upper surface of the rotor 4. The reflection surface 2b is inclined at approximately 45 degrees with respect to the base portion 2a that is the attachment surface of the reflection plate 2, the base portion 2a is attached at a position away from the rotation center, and the reflection surface 2b is an upper position of the penetrating shaft 8. Placed in.

  The light emitted from the LED 3 is reflected in the direction of about 90 degrees with respect to the penetrating shaft 8 by the reflecting surface 2b. Therefore, the light of the LED 3 is emitted according to the rotational speed of the rotor 4 in all directions of 360 degrees in the horizontal direction around the small rotating light 1.

FIG. 2 is a sectional view showing another embodiment of the small rotating light according to the present invention.
In this embodiment, the LED 3 is attached to the back of the penetrating shaft 8, and the convex lens 13 is disposed on the front surface of the LED 3, and other configurations are the same as those in FIG. 1.
By adding the convex lens 13, the light emitted from the LED 3 is converged, and the light reflected by the reflecting plate 2 becomes parallel light and can reach further. In addition, by disposing a concave lens, the light can be diverged in reverse, and illumination with a large diameter can be performed on the irradiation target.

FIG. 3 is a block diagram showing an embodiment of a drive circuit for driving a small rotating light according to the present invention. In the circuit example of FIG. 3A, the polarity of the current flowing through the coil 16 is switched by detecting the position of the rotor by the Hall element 21, the output of the Hall element 21 is connected to the input terminal of the IC 15, and the capacitor 14 is connected in parallel. The brushless motor is driven by the IC15 output.
By providing volume resistors 17 and 18 between one output terminal of the Hall element 21 and one connection terminal of the capacitor 14 and between the other output terminal of the Hall element 21 and the other connection terminal of the capacitor 14, respectively. Changes in the starting torque and current can be kept small, and variations in the rotational speed can be adjusted to a small range without impairing the stability of the circuit.

By this circuit, the motor can be easily adjusted to different rotational speeds. Since the speed reduction adjustment is performed with the volume resistance of the circuit, no noise is generated and the durability is excellent.
FIG. 3B shows an equivalent circuit of FIG.

  Although the above embodiment shows an example in which the LED is built in the through shaft, it is also possible to insert an optical fiber from the lower portion of the through shaft and guide external light into the through shaft. In addition, multiple optical fibers can be inserted, and different colors of light can be guided to each optical fiber. By combining light colors freely, colors such as red, blue, and different colors can be combined. It is also possible to control the color of the light so that it is output at different times.

  Further, although an example using two ball bearings is shown, the configuration of the present invention can be realized even with one ball bearing. Further, the same effect can be obtained even if a plain bearing is used as the bearing.

  It can be applied to a security system that warns by operating a rotating light when an abnormality is detected by sensor detection.

It is sectional drawing which shows embodiment of the small rotation light by this invention. It is sectional drawing which shows other embodiment of the small rotation light by this invention. It is a block diagram which shows embodiment of the drive circuit which drives the small rotation light by this invention.

Explanation of symbols

1 Small rotating light 2 Reflector 3 LED (light source)
4 Rotor
5 Magnet 6 Coil 7 Housing 8 Penetrating shaft 9 Lead wire 10 Bearing 11 Light beam 12 Spring 13 Convex lens 14 Capacitor 15 IC circuit 16 Coils 17 and 18 Volume resistance
19, 20 Fixed resistance

Claims (5)

A cylindrical penetrating shaft;
A light source mounted in the cylindrical penetrating shaft to emit light from an opening at the top of the cylinder; and
A bearing fixed to the penetrating shaft;
A rotor secured to the bearing;
A reflecting plate having a base portion installed on the periphery of the upper surface of the rotor so that the reflecting surface is positioned at a predetermined angle on the opening of the upper part of the cylinder;
A magnetic circuit formed by permanent magnets and coils;
A drive circuit that rotationally drives the rotor by controlling the current flowing through the coil;
A small rotating light by a brushless motor, wherein a light beam is rotated and emitted around by rotating the reflecting plate.   2. The small rotating light by a brushless motor according to claim 1, wherein the light source is an LED.   3. A small rotating light by a brushless motor according to claim 1, wherein a lens is provided in front of the light source to converge or diffuse the light beam.   4. A small brushless motor according to claim 1, wherein the predetermined angle is approximately 45 degrees, and the angle of the light reflected and redirected by the reflector is substantially perpendicular. Rotating light.   5. A compact rotating light by a brushless motor according to claim 1, wherein the driving circuit has an adjusting section for adjusting the rotational speed of the rotor.

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