JP2016012516A - LED projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weight LED projector having a relatively simple structure and facilitating assembly work, without using a heavy-weight material and a heat radiation structure having a complicated constitution, and without using forcibly cooling means such as a heat radiation fan.SOLUTION: An LED projector comprises: a panel-like light projection part 100 whose front face is a light projection part comprising an LED element 4B; a light projection part heat radiation part 200 that is provided on the back face of the panel-like light projection part, and radiates heat transmitted from the LED element with a chimney effect; and a power source heat radiation part 300 that comprises a power source unit 1 and a wind guide plate 2 installed on a back surface to be the opposite surface of the light projection part heat radiation part with respect to the panel-like light projection part.

Description

  The present invention relates to an LED projector in which a large number of LED elements are arranged as light emitting means, and more particularly to an LED projector having a heat dissipation structure that efficiently reduces heat generation of an LED element and a power supply unit associated with lighting driving.

  Due to the characteristics of improved light emitting performance and low power consumption, lighting fixtures using LED elements (light emitting diodes) as light emitting devices have been put into practical use. Lighting fixtures using LED elements (hereinafter also referred to as LED lights) are electric lamps with a relatively low light output for indoor lighting, in which one or more LED elements are sealed in a mounting container (lamp). Various light outputs, shapes, and sizes have been put to practical use, including projectors used for lighting in public facilities and stadiums. Moreover, the drive power source for lighting is housed in a common lamp together with the LED element, or is a separate unit (power supply unit) from the lamp element of the LED element, etc. There is.

  An LED projector that requires a large amount of light is not only used alone, but also used in an outdoor stadium or the like, a plurality of LED projectors are arranged vertically and horizontally to form a large amount of projector. The LED floodlight used in such a floodlight device has a larger number of LED elements mounted on one LED floodlight than an LED lighting fixture used indoors, and many of them are arranged as a floodlight device. In addition, the calorific value becomes enormous.

  The LED element is current-driven, and is currently about 80 Lm / W to 200 Lm / W (roadmap: 2020), including the light emission efficiency and its power supply efficiency, and the power that does not contribute to light emission becomes heat and becomes a lamp Stay. In the case of a light projecting device in which a plurality of LED projectors are arranged, it is difficult to obtain a sufficient heat dissipation effect with a heat sink such as a normal heat dissipation fin provided in each LED projector. Some have a forced cooling fan or liquid circulation cooling structure, but the increase in installation cost cannot be ignored. Also, heat generated from the power supply circuit must be dealt with.

  Patent Literature 1, Patent Literature 2, Patent Literature 3 and the like can be cited as disclosures of the related art regarding the heat treatment (heat radiation) structure of the LED element and the power supply circuit in the LED projector.

  The LED lighting device disclosed in Patent Document 1 has an LED unit on which a plurality of LED elements are mounted on the surface of a fixture body formed of aluminum metal having a heat radiation fin formed on the back surface, and a power supply device is fixed on the heat radiation fin. Thus, a configuration is disclosed in which the appliance main body and the power supply device are thermally separated, and the heat of the LED unit is radiated without being disturbed by the heat of the power supply device.

  Moreover, in patent document 2, the mounting substrate which mounted LED was installed in the lower surface using the substantially rectangular shaped cooling device shape | molded with the aluminum member. The cooling device is provided with an air passage from the side surface to the upper surface, and the air in the air passage is warmed by the heat generated as the LEDs are turned on, and flows out from the opening on the upper surface. With this air flow, the surrounding cold air flows into the opening from the side opening and similarly becomes an ascending air current. When this air flow continues, the heat generated with the lighting of the LED is dissipated.

  The illuminating device disclosed in Patent Document 3 discloses a structure that improves the heat dissipation effect of the LED by the cooling fan by providing a heat dissipation member on the back surface of the fixture body on which the LED is mounted and attaching a cooling fan and an airflow to the heat dissipation member To do.

JP 2008-98020 A JP 2012-54094 A JP 2012-226959 A

  Since the heat dissipation structure shown in Patent Document 1 or Patent Document 2 is a main body structure including a heat sink structure such as a cooling fin formed by extrusion molding of a metal bulk such as aluminum as the main body. When applied to a large projector, the weight of the entire projector is excessive due to the weight of the heat dissipation structure itself. Therefore, for example, when used for a lighting device in a stadium, it is necessary to strengthen the installation stand, which is an incidental cost, and the installation work becomes difficult. Furthermore, the material cost is high, and there is a limit to reducing the cost of the mounting work.

  Moreover, the forced air cooling structure using the cooling fan as disclosed in Patent Document 3 consumes a large amount of power and has a considerably large number of parts. Therefore, it is difficult to reduce the cost of the lighting fixture itself and the installation cost for assembling as a light projector.

  As described above, it is practical to apply the heat dissipation structure of the conventional LED lighting fixture as it is to a large (large light) projector in consideration of the manufacturing cost of the fixture and the incidental cost required to install the completed projector. Not. The object of the present invention is to achieve a lightweight structure that is relatively simple and easy to assemble without using heavy materials and complicated heat dissipation structures, and without using forced cooling means such as heat dissipation fans. The object is to provide an LED floodlight.

  In order to achieve the above object, the LED projector according to the present invention is configured as described below. Here, in order to facilitate understanding of the configuration of the present invention, reference numerals in the drawings of the embodiments are added and described.

  (Basic configuration) An LED projector according to the present invention is transmitted from the LED element provided on the rear surface of the panel-shaped light projecting part (100) having a front surface as a light-projecting part composed of LED elements. The light projecting part heat radiating part (200) for radiating the heat generated by the chimney effect, and the wind guide plate and the power supply unit installed on the back surface opposite to the panel light projecting part of the light projecting part heat radiating part It is characterized by comprising a power radiating section (300) comprising

(Configuration Example 1) A panel-shaped light projecting unit (100) including a main body frame (7) in which a light projecting unit is configured by one or a plurality of LED substrates (4A) in which a large number of LED elements (4B) are arranged on the front surface;
An LED substrate that is installed on the back surface of the LED substrate (4A) on the back surface of the main body frame (7) and dissipates heat of the LED element (4B) that is transmitted mainly from the LED substrate (4A) by heat conduction. A light projection composed of a heat radiating plate (4) and a plurality of square pipes (3) arranged in parallel with one side wall fixed to the surface opposite to the LED substrate (4A) of the LED substrate heat radiating plate (4). Heat radiating part (200),
A power heat radiating section (300) comprising a wind guide plate (2) and a power supply unit (1) installed on the back surface of the light projecting section heat radiating section (200) opposite to the panel-shaped light projecting section (100). And consists of
The heat generated by the LED element (4B) is thermally conducted to the LED board heat radiating plate (4), dissipated mainly by the chimney effect of the square pipe (3), and the heat generated by the power supply unit (1) is mainly Heat is radiated by the heat conduction to the square pipe (3) by the air guide plate (2) and the chimney effect generated in the gap between the square pipe (3) and the air guide plate (2).

  (Configuration Example 2) The main body frame (7) of the panel-shaped light projecting unit (100) in (Configuration Example 1) is rectangular, and the square pipe (3) is parallel to the short side of the main body frame (7). In the use of the LED projector, the main body frame (7) is used in a posture in which the short side is in the vertical direction.

  (Configuration Example 3) The main body frame (7) of the panel-shaped light projecting unit (100) in (Configuration Example 1) is rectangular, and the square pipe (3) is parallel to the long side of the main body frame (7). In the use of the LED projector, the main frame (7) is used in a posture in which the long side is in the vertical direction.

  (Configuration Example 4) Gap between the plurality of square pipes (3) in any one of (Configuration Example 1) to (Configuration Example 3), and the plurality of square pipes (3) and the air guide plate (2) The gap between the two has a chimney effect.

  (Configuration Example 5) A light diffusion cover (5) is provided on the forefront of the main body frame (7) in any one of (Configuration Example 1) to (Configuration Example 4).

  (Configuration Example 6) The main body frame (7), the LED board heat sink (4), the square pipe (3), and the air guide plate (2) in any one of (Configuration Example 1) to (Configuration Example 5). Is a lightweight metal plate press-formed product or sheet metal molded product suitable for aluminum.

  The present invention is not limited to the above-described configuration example, and it goes without saying that various modifications can be made without departing from the technical idea of the present invention.

  The LED projector according to the present invention is installed in a state where it stands up and down (a state where the main body frame (7) is upright or slightly inclined). In this state, heat generated from the LED element (4B) of the panel-shaped light projecting unit (100) is transmitted from the LED board heat sink (4) to the square pipe (3) by heat conduction. The air inside the square pipe (3) is heated by this heat to decrease the density and increase the buoyancy. As a result, the air inside the square pipe (3) flows into information, rises and is released into the air from the upper opening of the square pipe (3).

  As the air flow in the square pipe (3) rises, the air is sucked from the lower opening of the square pipe (3). A so-called chimney effect occurs, and an air flow continuously passes through the inside of the square pipe (3). This air flow prevents heat from the LED element transmitted from the LED board heat sink (4) from diffusing into the air, preventing the LED element from overheating and reducing luminous performance or causing destruction. Is done.

  On the other hand, the heat generated in the power supply unit (1) is transmitted to the square pipe (3) through the air guide plate (2) by heat radiation and heat conduction. This heat heats the air inside the square pipe (3) and is dissipated in the same manner as the heat from the LED element. In addition, a chimney effect is also generated in the gap between the air guide plate (2) and the plurality of square pipes (3). In this portion, an increase in air flow and inhalation of cold air occur, and the power supply unit (1) The generated heat is dissipated.

  In the present invention, a heat dissipation structure mainly composed of a square pipe (3) is provided between the main body frame (7) constituting the LED projector and the power supply unit (1). Both of the heat generated by the power supply unit that drives the element can be effectively radiated.

  Compared to conventional heat sinks, the heat dissipation structure can be composed of only a lightweight metal plate, and it does not require energy-related equipment that is not directly related to light generation, such as a cooling fan. Can provide.

It is an expansion | deployment perspective view explaining Example 1 of the LED projector which concerns on this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a three-plane figure of the back surface, upper surface, and side surface explaining Example 1 of the LED projector which concerns on this invention. It is a schematic diagram explaining the thermal radiation effect | action of Example 1 of the LED projector which concerns on this invention. It is an expansion | deployment perspective view explaining Example 2 of the LED projector which concerns on this invention.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described in detail with reference to the drawings of the embodiments. The basic configuration of the LED projector according to the present invention includes a panel-shaped light projecting portion (100) having a front surface as a light projecting portion, and a panel-shaped light projecting portion (100) provided on the back surface of the panel-shaped light projecting portion (100). The light projecting part heat dissipating part (200) for dissipating the transmitted heat from the light projecting part by the chimney effect is opposite to the panel light projecting part (100) of the light projecting part heat dissipating part (200). That is, it is constituted by a power heat radiating section (300) composed of a wind guide plate and a power supply unit installed on the rear surface.

  The configuration of the first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a developed perspective view for explaining an embodiment 1 of the LED projector according to the present invention. FIG. 2 is a back view (center view), an upper surface (upper view) for explaining the embodiment 1 of the LED projector according to the present invention, It is a three-view figure of a side surface (right figure). 1 and 2, a plurality of LED substrates 4A in which a large number of LED elements 4B are arranged are arranged on the front surface (left side in FIG. 1) of the panel-shaped light projecting unit 100 including the main body frame 7 to constitute a light projecting unit. ing.

  In this embodiment, 90 (15 × 6) LED elements 4B are mounted on one LED substrate 4A. Five LED substrates 4A are arranged and mounted on a main body frame 7 formed of an aluminum material.

  A light diffusion cover 5 is provided to cover the surface on which the LED elements 4B are arranged. The light diffusing cover 5 is a heat-resistant and hard resin plate, and serves as a light diffusing surface in which minute unevenness processing, grooves, and the like are formed on the surface. In addition, it can replace with the light-diffusion cover 5 and can also be set as a transparent LED element protective cover.

  On the back surface of the main body frame 7, an LED substrate heat dissipation plate 4 that dissipates heat of the LED element 4 </ b> B transmitted mainly by heat conduction from the LED substrate 4 </ b> A is attached to the back surface of the LED substrate 4 </ b> A by fixing means such as screws. . A plurality of square pipes 3 having a side wall fixed to and parallel to the surface opposite to the LED substrate 4A of the LED substrate heat sink 4 are provided. The LED board heat radiating plate 4 and the plurality of square pipes 3 constitute a light projecting part heat radiating part 200).

  On the back surface of the light projecting unit heat radiating unit 200 opposite to the panel light projecting unit 100, a power heat radiating unit 300 including the air guide plate 2 and the power supply unit 1 is installed. The air guide plate 2 is attached to the square pipe 3 with an interval so as to form an air passage (wind guide path) between the air guide plate 2 and the square pipe 3. Therefore, a structure having a chimney effect is also formed between the adjacent square pipe 3 and the air guide plate 2. In the present embodiment, the power supply unit 1 is housed in a metal housing, an air port is provided on the side wall of the metal housing, a metal mesh cover is provided on the back surface, and the power supply circuit housed in the power supply unit 1 Is naturally cooled to some extent (natural air cooling). The means for natural air cooling of the metal casing is not limited to the above, and may be a known opening shape. Note that it is not excluded to install a small cooling fan for cooling particularly necessary portions.

  The heat generated by the LED element 4B is thermally conducted to the LED board heat radiating plate 4, and is radiated mainly by a chimney effect in which air flows inside the square pipe (3). Heat generated by the power supply unit 1 is radiated mainly by heat conduction to the square pipe 3 by the air guide plate 2 and a chimney effect generated in the gap between the square pipe 3 and the air guide plate 2.

  The main body frame 7 of the panel light projecting unit 100 constituting the LED projector of the present embodiment is a horizontally long rectangle, and a plurality (15 in this case) of the square pipes 3 are parallel to the short side of the main body frame 7. is set up. This LED projector is used in a posture in which the short side of the main body frame 7 is in the vertical direction.

  The cooling by the chimney effect of the square pipe 3 is such that the air in the square pipe 3 arranged up and down is heated at the temperature of the square pipe 3 and discharged from the upper end opening, and a new one is introduced from the lower end. This is a phenomenon in which air is sucked and the above operation is repeated. That is, the air inside the square pipe 3 is heated by heat transmitted from the heat source (LED element) to the square pipe 3, rises by buoyancy increased due to a decrease in air density, and is discharged from the upper open end of the square pipe. The Along with this, cold air is sucked from the lower opening end of the square pipe 3, and the temperature of the square pipe is deheated by the continuous flow of air flow as described above. As a result, the heat generated by the LED element is dissipated, and a reduction or loss of the light emitting function of the LED element due to overheating is avoided.

  FIG. 3 is a schematic diagram for explaining the heat radiation action of the first embodiment of the LED projector according to the present invention. The reference numerals in FIG. 3 are the same as those in FIGS. 1 and 2, and the main parts are shown in cross section. As described above, the square pipe 3 is attached to the LED board heat sink 4 so as to be parallel to the short side of the main body frame 7. The heat generated by the LED element 4B is transmitted from the LED board 4A through the LED board heat sink 4 mainly by heat conduction. This heat flow is indicated by arrow 8.

  The heat from the LED element 4 </ b> B indicated by the arrow 8 raises the temperature of the air inside the square pipe 3. The temperature of the heated air decreases as the density decreases, flows upward in the square pipe 3, and is discharged into the atmosphere from the upper opening end. As the air flows, air is sucked from the lower open end of the square pipe 3. The sucked air is heated in the same manner as described above, and discharged from the upper opening end into the atmosphere. This air flow is repeated as shown by the long arrows passing through the square pipe in FIG. 3, and the heat generated by the LED elements is dissipated.

  A power heat radiating section 300 including the air guide plate 2 and the power supply unit 1 is attached to the back surface of the square pipe 3. As indicated by an arrow 9 in FIG. 3, the heat generated by the power supply unit 1 is transmitted by heat conduction to the square pipe 3 mainly through the air guide plate 2. This heat is dissipated by the chimney effect inside the square pipe 3 and the chimney effect generated between the air guide plate 2 and the gap between the square pipes, similarly to the heat generation of the LED element.

  Thus, according to the present embodiment, the square pipe is provided, and the heat generated by the LED element and the power supply unit can be radiated using the chimney effect. For this reason, a heat radiating structure such as a cooling fin which is heavy and expensive to manufacture is not required, and forced cooling means such as a cooling fan is not required.

  In the prototype of the present invention, a projector of about 115,000 Lm could be configured using a 145 Lm / W LED element. The frame and other main components were made of aluminum plates, and the weight was reduced to 15 kg. A projector that could be easily handled was realized.

  FIG. 4 is a developed perspective view for explaining an embodiment 2 of the LED projector according to the present invention. The same functional parts as those in FIG. 1 are denoted by the same reference numerals. The second embodiment is different from the first embodiment in that the square pipe 3 installed on the back surface of the main body frame 7 is provided in a direction parallel to the long side of the main body frame 7. Except this part, it is the same as that of Example 1. The LED projector according to the second embodiment is used in a posture in which the long side of the main body frame 7 is set up and down.

  Therefore, the square pipe 3 extends in the vertical direction, and the heat generated by the LED element 4B and the heat generated by the power supply unit 1 are radiated by the chimney effect of the square pipe. This heat dissipation action is the same as that described in the first embodiment with reference to FIG.

  Also according to the present embodiment, the heat generated by the LED element and the power supply unit can be radiated using the chimney effect of the square pipe. For this reason, a heat radiating structure such as a cooling fin which is heavy and expensive to manufacture is not required, and forced cooling means such as a cooling fan is not required.

  In each of the embodiments described above, it has been described that a plurality of LED substrates mounted with a large number of LED elements are mounted to form a panel-shaped light projecting unit. However, a single LED substrate mounted with necessary LED elements is used. A panel-like light projecting unit can also be configured. The number of LED elements and the number of LED substrates mounted are arbitrary.

  In each of the above embodiments, the chimney effect is obtained by using a rectangular pipe having a rectangular cross section. However, the present invention is not limited to this, and a triangular pipe in which one side wall is fixed in contact with the LED board heat sink. Alternatively, an LED projector having the same heat dissipation effect as the above embodiments can be obtained by using a pipe having a semicircular or partial circular cross section, a pipe having a polygonal cross section, or the like.

  According to the present invention, a relatively simple structure and an assembling operation can be easily performed without using a heavy bulk metal material or a complicated heat dissipation structure, and without using forced cooling means such as a heat dissipation fan. A lightweight LED floodlight can be provided.

DESCRIPTION OF SYMBOLS 1 ... Power supply unit 2 ... Air guide plate 3 ... Square pipe 4 ... LED board heat sink 4A ... LED board 4B ... LED element 5 ... Diffusion cover 6 ... Cover Seal 7 ... Body frame 100 ... Panel-shaped light projecting part 200 ... Light projecting part heat radiation part 300 ... Power supply heat radiation part

Claims (7)

  A panel-shaped light projecting portion having a front surface made of a LED light projecting portion, and a light projecting portion heat radiation portion for dissipating heat transferred from the LED element by a chimney effect provided on the back surface of the panel-shaped light projecting portion And an LED floodlight comprising a power guide heat radiation plate and a power guide unit installed on the back surface opposite to the panel-shaped light projecting portion of the light projecting portion heat radiation portion. A panel-shaped light projecting unit composed of a main body frame configured of a light projecting unit with one or a plurality of LED substrates in which a large number of LED elements are arranged on the front surface;
An LED board heat dissipating plate installed on the back surface of the LED substrate on the back surface of the main body frame and dissipating heat of the LED element transmitted from the LED substrate mainly by heat conduction, and the LED of the LED substrate heat dissipating plate A light projecting part heat dissipating part composed of a plurality of square pipes arranged in parallel with one side wall fixed to the opposite surface of the substrate;
It is composed of a wind guide plate installed on the back surface opposite to the panel-shaped light projecting portion of the light projecting portion heat radiating portion and a power heat radiating portion consisting of a power supply unit,
Heat generation of the LED element is thermally conducted to the LED board heat dissipation plate, and is mainly dissipated by the chimney effect of the square pipe. Heat generation of the power supply unit is mainly conducted to the square pipe by the air guide plate and An LED projector that radiates heat by a chimney effect generated in a gap between the square pipe and the air guide plate. In claim 2,
The main body frame of the panel-shaped light projecting unit is rectangular,
The square pipe is installed to be parallel to the short side of the main body frame,
In the use of the LED projector, the LED projector is used in a posture in which the short side of the main body frame is in the vertical direction. In claim 2,
The main body frame of the panel-shaped light projecting unit is rectangular,
The square pipe is installed to be parallel to the long side of the main body frame,
An LED projector that is used in a posture in which the long side of the main body frame is vertically oriented. In any one of Claims 1 thru | or 3,
An LED projector having a chimney effect also in a gap between the plurality of square pipes and a gap between the plurality of square pipes and the air guide plate. In any one of Claims 1 thru | or 4,
An LED projector having a light diffusion cover on the forefront of the main body frame. In any of claims 1 to 5,
The LED projector according to claim 1, wherein the main body frame, the LED board heat dissipation plate, the square pipe and the air guide plate are any one of a lightweight metal plate press-molded product and a sheet metal molded product suitable for aluminum.

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