KR20190088173A - LED searchlight with light distribution control - Google Patents

Abstract

The present invention relates to an LED searchlight capable of controlling light distribution, which is able to detect by irradiating a light onto a specific region or a specific subject in a remote place at night, to perform a light distribution control using an LED module as a light source, to control light distribution by using a fixed lens and a variable lens, to make a lightweight searchlight, and to maximize the usability in accordance with application of the equipment. That is, according to the present invention, the LED searchlight capable of controlling light distribution comprises: a main body in the shape of a tank with an opening on the front surface; an LED assembly installed inside the main body, which includes an LED module and a variable lens of a type with total internal reflection; a step motor installed on the rear side of the main body to perform normal and reverse rotations to move the LED assembly forward and backward; a fixed lens of a Fresnel type, which is fixated on an entrance side opened in the main body; and a control unit electrically connected to the LED assembly and the step motor.

Description

LED searchlight with light distribution control {LED searchlight with light distribution control}

The present invention relates to an LED searchlight capable of controlling a light distribution by using an LED module as a light source for detecting light by irradiating light to a specific area or a specific object at a remote place at night. More specifically, Which can control the light distribution through a light source and provide a searchlight with a light weight, thereby maximizing utilization of the equipment.

A searchlight is a device for illuminating and detecting light at a specific area or a specific object at a distance at night, and is mainly used for military or aviation. Such a searchlight should irradiate light several hundred meters away and several kilometers away, so that the light intensity should be high and the intensity of the light should be as parallel as possible.

Conventional high-performance searchlights mainly use xenon, HID, and halogen lamps as light sources. However, in recent years, much efforts have been made to apply LED module light sources to searchlights in consideration of excellent vibration resistance, high reliability, and low power consumption of LED modules.

As an example of the prior art, there is disclosed an LED search lamp of Korean Patent Laid-open Publication No. 10-2014-0129693 (Apr. 31, 2014), a ship having an efficient light collecting structure of Korean Registered Patent Publication No. B1-1479768 (Feb. An LED searchlight for a ship having a high light intensity condensing structure of an LED searchlight, 10-1579147 (Dec. 21, 2015), an LED searchlight for a ship, and an LED searchlight have been proposed in Korean Patent Laid-Open Publication No. 10-2014-0129693 (Apr.

As described above, most of the LED searchlights are of a fixed type, and in particular, provide various technologies for focusing. In the case of 10-2014-0129693, a technology for controlling the light distribution has been proposed. A body sealed with a transparent material and made of a metal having a high thermal conductivity; An LED module installed inside the front of the main body and outputting light backward; A reflector installed in the rear of the main body to reflect light output from the LED module and irradiate light to the front of the main body; And a plurality of extension portions extending in a direction toward the inner wall of the main body from the central portion and then bent rearward of the main body, wherein the LED module is installed in the central portion, The central part and the extension part include a heat dissipation module formed of a heat pipe, and a reflector varying means is provided at the rear of the reflector so as to change the reflector in the longitudinal direction of the main body.

This allows the heat generated from the LED module, which consists of a large power LED package with a very high calorific value, to be quickly transferred to the outside and released.

However, although the distance between the reflector and the LED module is adjusted in the above-described prior art, it is difficult to expect the light distribution efficiency because the reflection range of the light is simply different. In addition, since the LED module is disposed in front of the reflector, the light reflected by the reflector is disturbed by the LED module, thereby reducing the amount of light, and it is difficult to mount the LED on the unmanned airplane.

KR 101479768 B1 2015.01.26. KR 101579147 B1 2015.12.21. KR 1020140129693 A 2014.11.07.

Accordingly, the present inventor researched all the problems of conventional LED search lamps and developed the present invention.

That is, according to the present invention, it is possible to provide a spatial distribution of various luminous intensities by combining the fixed lens and the variable lens, and the body, the fixed lens, and the LED assembly can be designed and manufactured by lightweight and installed in a drone The present invention has been accomplished on the basis of the technical object of the present invention with the object of providing an LED searchlight capable of controlling the light distribution so as to maximize utility according to the application of the apparatus.

A tubular main body having a front surface opened at first; An LED assembly installed in the main body, the LED assembly including an LED module and a variable total internal reflection type lens; A step motor provided at the rear of the main body for rotating the LED assembly forward and backward; A fixed lens of the Fresnel type fixed to the opening side of the main body; And a control unit electrically connected to the LED assembly and the step motor.

Second, the LED assembly includes: a support plate fixed to the bottom of the main body; A heat sink for moving along a guide pin erected on the support plate; A nut member provided at the center of the support plate or the heat sink and assembled to a screw shaft driven by a step motor; And an LED module and a variable lens attached to the front surface of the heat sink.

Third, a reflection shade is further provided between the fixed lens and the variable lens, and the reflection shade is combined with three to five halves. An upper outer yoke of the variable lens and a fixing pin and a first torsion spring to urge the reflector outward; A second torsion spring is provided between the reflector and the inner surface of the main body to urge the reflector inward; And the second torsion spring is capable of providing a greater elastic force than the first torsion spring.

Fourthly, on the inner surface of the main body, there is provided a detection sensor for sensing a state where the heat sink of the LED assembly is positioned at the top dead center and the bottom dead center so as to be electrically connected to the control unit.

The LED searchlight capable of controlling the light distribution provided by the present invention has the following effects.

-LED assemblies are simple in configuration, making it possible to manufacture LED search lights with light weight. Therefore, it can be used in various industrial fields. When it is used in military, personal portability is easy. Even if it is mounted on an unmanned airplane, the weight can be minimized, enabling unmanned airplane operation.

-LED assembly adjusts the distance between the fixed lens and the variable lens while moving forward and backward, so it is possible to provide a spatial distribution of various luminous intensities.

- It is possible to prevent the luminosity provided through the LED and the variable lens from being lost inside the main body when the LED assembly is opened or closed inside the main body.

1 is a perspective view illustrating an LED search lamp according to a preferred embodiment of the present invention,
Figure 2 is a perspective view of an LED assembly according to the present invention;
FIG. 3 is a cross-sectional view of the present invention,
FIG. 4 is a cross-sectional view of the present invention showing a state in which the LED assembly is lowered
5 is a perspective view showing another example of the LED assembly according to the present invention.
Fig. 6 is a cross-sectional view of Fig. 5 showing a state in which the LED assembly is lifted
Fig. 7 is a cross-sectional view of Fig. 5 showing a state in which the LED assembly is lowered

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of an LED search lamp capable of light distribution control provided by the present invention will be described with reference to the accompanying drawings.

2 is a perspective view showing an LED assembly according to the present invention, and Figs. 3 and 4 are cross-sectional views of an LED lamp according to an embodiment of the present invention. Fig. In which the LED assembly is lifted and lowered.

The LED searchlight 1 capable of controlling the light distribution provided by the present invention is characterized in that it can be manufactured in a lightweight structure and simplified in its configuration, and can provide a spatial distribution of various luminous intensities.

The LED assembly 3 is installed inside a tubular main body 2 having a front surface opened. A step motor 4 is installed at the rear of the main body 2. 2, the stationary lens 5 is engaged.

The LED assembly 3 includes a LED module 31 as a light source and a variable lens 32 that reflects light emitted from the light source toward the fixed lens 5 coupled to the front surface of the main body 2 The LED assembly 3 is controlled by a step motor 4 that can rotate forward and reverse so that the distance between the stationary lens 5 and the variable lens 32 is adjusted while advancing and retracting, So that the light distribution control can be performed.

At this time, the main body 2 is made of a plastic material having excellent durability and the fixed lens 5 is made of a Fresnel lens type so that the weight can be reduced.

A Fresnel lens is a lens in which a lens is divided into several or more circle-shaped lenses to reduce the thickness of the lens. There is an advantage that a lens having a large aperture can be made without increasing the thickness of the lens.

The Fresnel lens used as the fixed lens 5 is configured to have a small thickness and to provide a large lens so that light can be condensed. In addition, the variable lens 32 uses an internal total reflection lens in which light having an incident angle equal to or greater than the critical angle is reflected at the boundary surface of the medium, and the LED module 31 is disposed at the center thereof. And is guided to the fixed lens 5 side without any omission due to the characteristics of the total internal reflection lens.

2 to 4, the LED assembly 3 in the LED searchlight 1 capable of controlling the light distribution provided by the present invention fixes the support plate 33 using bolts to the bottom of the main body 2 . A hole is formed at the center of the support plate 33, and a guide pin 34 is coupled to the edge of the support plate 33. The guide pin 34 which is erected in a state where the one end is fixed to the support plate 33 can be slidably inserted through the bush 36 coupled to the heat dissipation plate 35. At this time, Three locations are installed at an angle of 120 degrees to provide the structure.

The heat dissipation plate 35 is made of an aluminum material having excellent thermal conductivity and may be provided in a configuration that improves the cooling efficiency by forming a concave-convex heat dissipation fin toward the support plate 33, though not shown separately.

An LED module 31 used as a light source is coupled to a front center of the heat sink 35 and controlled by a control unit 6. A variable lens 32 is coupled to the front of the LED module 31, 32 are pressed by the lens fixing member 37 and the lens fixing member 37 is fixed to the heat dissipating plate 35 by bolts. At this time, the control unit 6 may be formed integrally with the main body or may be provided separately from the present invention.

A nut member 38 is coupled to the rear side of the heat dissipating plate 35 and a screw shaft 39 driven by a step motor 4 is coupled to the nut member 38 to move the nut member 38 . At this time, the screw shaft 39 is connected to the shaft of the step motor 4 by a coupling so that power can be transmitted.

On the inner surface of the main body 2, a sensing sensor 7 for sensing the state where the heat sink 35 is positioned at the top dead center and the bottom dead center is provided and electrically connected to the control unit 6. At this time, a photocoupler or a limit switch or the like may be selectively applied to the detection sensor 7.

When the power of the LED searchlight 1 capable of controlling the light distribution of the present invention as described above is applied, the control unit 6 first applies power to the step motor 4 to apply the heat sink 35 to the top dead center and bottom dead center So that the position of the LED assembly 3 can be recognized by the control unit 6.

At this time, the controller 6 stores the value, uses the value as a base value, and moves the LED assembly 3 so as to provide the light distribution matching the purpose of use. For example, when the focal length L1 between the fixed lens 5 of the Fresnel lens type and the variable lens 32 providing the total internal reflection function is narrowed, it is possible to provide a light distribution of a narrow area On the other hand, when the focal length L2 between the stationary lens 5 and the variable lens 32 is widened, it is possible to provide a light distribution of a large area (about 20 deg.).

The control unit 6 enables another control to be performed on a communication protocol using RS232, thereby enabling wireless control.

FIG. 5 is a perspective view showing another embodiment of the LED assembly according to the present invention, FIG. 6 is a sectional view of FIG. 5, and FIG. 7 is a sectional view of FIG. Respectively.

This is another example of the LED assembly 3. In the LED assembly 3 as described above, the reflector 8 is further provided on the upper side of the variable lens 32 so as to face the fixed lens 5 .

At this time, the reflector 8 is coupled to the upper outer edge of the variable lens 32, preferably to the lens retainer 37 pushing the variable lens 32 with the lower end of the reflector 8 by the fixing pin 9, A second torsion spring 11 is inserted between the outer surface of the reflector 8 and the inner surface of the main body 2 while the first torsion spring 10 is engaged with the fixing pin 9 to urge the reflector 8 outwardly. And the reflector 8 is pressed inward. At this time, the second torsion spring (11) can provide a larger elastic force than the first torsion spring (10).

The reflector 8 is divided into 3 to 5 thin thin plates so that the connecting portions of the divided members overlap each other. Further, since there is a possibility that the upper part of the reflection shade 8 in a free state rubs against the fixed lens 5 and may damage the fixed lens 5, a slide member having a soft structure may be additionally provided (not shown).

As described above, when the reflector 8 is further provided, the light provided from the variable lens 32 is diffused in the space between the variable lens 32 and the fixed lens 5 to provide a function of preventing the brightness from decreasing .

That is, when the LED assembly 3 is lowered to the bottom dead center position, the reflector 8 of the present invention provides the elastic force of the second torsion spring 11 to the reflector 8, And the upper end of the reflector 8 is positioned at the upper end of the reflector 8 when the LED assembly 3 ascends to the top dead center position The resilient force of the first torsion spring 10 is provided in the state of being supported by the stationary lens 5 so that the reflector 8 is widely spread and positioned in a narrow space between the stationary lens 5 and the variable lens 32 (See Fig. 6)

Therefore, when the reflector 8 is applied as in the other embodiments of the present invention, the light emitted from the LED module 31 may be reflected to the fixed lens 5 through the variable lens 32, The light is also reflected from the reflector 8 toward the fixed lens 5, so that the light intensity can be prevented from being lowered.

As described above, according to the LED searchlight 1 capable of controlling the light distribution according to the present invention, it is possible to manufacture a lightweight vehicle, and thus it can be applied to an unmanned airplane. In particular, the Fresnel lens type fixed lens 5, It is possible to determine the area of the horizontal plane light distribution by using the change in the distance of the variable lens 32 to be provided, thereby providing functionality such as light distribution by concentrating a narrow area and brightly distributing the light.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments. Therefore, the scope of protection of the present invention should not be limited to the described embodiment, but should be determined by the equivalents as well as the claims that follow.

1: LED searchlight with light control
2: Main body 3: LED assembly
31: LED module 32: variable lens
33: support plate 34: guide pin
35: heat sink 36: bush
37: lens fastener 38: nut member
39: Screw shaft 4: Step motor
5: fixed lens 6:
7: Detection sensor 8: reflector
9: Fixing pin 10: First torsion spring
11: second torsion spring

Claims (4)

A tubular main body 2 whose front surface is open;
An LED assembly 3 installed inside the main body 2 and including an LED module 31 and a variable total reflection type lens 32;
A step motor (4) installed at the rear of the main body (2) for rotating the LED assembly (3) forward and backward;
A fixed lens 5 of the Fresnel type fixed to the open entrance side of the main body 2;
And a control unit (6) electrically connected to the LED assembly (3) and the step motor (4).
The method of claim 1,
The LED assembly (3) comprises a support plate (33) fixed to the bottom of the main body (2);
A heat sink (35) moving along the guide pin (34) erected on the support plate (33);
A nut member (38) provided at the center of the support plate (33) or the heat sink (35) and assembled to a screw shaft (39) driven by the step motor (4);
And an LED module (31) attached to the front surface of the heat sink (35) and a variable lens (32).
The method of claim 1,
A reflector 8 is further provided between the fixed lens 5 and the variable lens 32;
The reflector 8 is a combination of three to five halves and is connected to the outer edge of the upper end of the variable lens 32 and the fixing pin 9 by the first torsion spring 10 to press the reflector 8 outwardly and;
A second torsion spring (11) is provided on the inner surface of the reflector (8) and the inner surface of the main body (2) so as to press the reflector (8) inward.
And the second torsion spring (11) can provide a greater elastic force than the first torsion spring (10).
The method of claim 1,
And a sensing sensor 7 for sensing a state where the heat sink 35 of the LED assembly 3 is positioned at the top dead center and the bottom dead center so as to be electrically connected to the control unit 6, LED searchlight capable of light distribution control.

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