JP2010251191A - Projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an LED projector which can improve an assembling workability by simplifying an assembly and retain a suitable brightness of an LED for a long period of time. <P>SOLUTION: The projector 10 includes a case 11 with its front face open, a printed wiring board 19 housed in an opening of the case 11, a plurality of light emitting elements 20 mounted on the printed wiring board 19, a plurality of lenses 21 respectively irradiating lights from the light emitting elements 20 forward, and a lens holder 29 having a plurality of lens holding parts 30 to which the lenses 21 are attached respectively corresponding to the light emitting elements 20 and being housed in the opening of the case 11 with the lenses 21 being attached to the respective lens holding parts 30 to be arranged in front of the printed wiring board 19, wherein the printed wiring board 19 is divided into a plurality of sections, and the lens holder 29 is also divided into a plurality of sections corresponding to the printed wiring board 19. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a projector using an LED (light emitting diode) as a light source, and more particularly, to an LED projector used for lighting a high-rise building or a tower.

  Currently, relatively large floodlights used for light-ups of high-rise buildings and towers are high wattage mercury lamps, high-intensity discharge lamps (HID lamps), sodium lamps, etc. The discharge lamp is used. However, such a discharge lamp uses a large amount of power. In addition, each time the color is changed depending on the season, it is necessary to replace the light bulb with white, red, green, blue, etc., which is troublesome. Furthermore, changing the color of the light bulb was merely a light-up to add color.

  Therefore, today, an LED projector that has low power consumption and enables a colorful rat-up by using white, red, green, and blue LEDs as a light source has been proposed (for example, Patent Document 1). reference).

  When comparing the brightness and power consumption of a projector using such an LED as the light source and the power consumption of a projector using a mercury lamp as the light source, the brightness of a 400 watt mercury lamp and 24 LEDs (72 watts) of 3 watts Experiments have shown that the brightness is almost the same. Therefore, in order to obtain the same brightness, when the mercury lamp or the like is used as the light source and when the LED is used as the light source, the LED consumes less power.

JP-A-10-208502.

  However, in a projector using a conventional LED as a light source, a printed wiring board on which a large number of LEDs and a regulator IC and the like are mounted, and a front side of each LED, the light from each LED is directed forward. A plurality of lenses to be irradiated and parts such as a container whose front surface is opened, and the lens and the printed wiring board are housed in the container, so the number of parts is large. Moreover, since there are many assembly steps, there was a problem in cost. Furthermore, as the size of the projector increases, there is a problem that the weight of parts increases and the assembly workability is poor.

  Furthermore, in order to maintain the proper brightness of the LED of the projector over a long period of time, in addition to providing a power supply circuit that prevents overcurrent, the heat dissipation of the LED is enhanced to prevent the LED from becoming overheated. It is necessary to have a structure that does not impair durability and long life.

  The present invention has been made in view of the above circumstances, and the object thereof is to simplify the assembly and improve the assembly workability, and to maintain the appropriate brightness of the LED over a long period of time. An object of the present invention is to provide an LED floodlight that can be used.

  In order to solve the above-described problems, a projector according to the present invention includes a container having a front surface opened, a printed wiring board accommodated in the opening of the container, and a plurality of devices mounted on the printed wiring board. A plurality of light emitting elements, a plurality of lenses for irradiating light from the light emitting elements respectively forward, and a plurality of lens holding portions to which the lenses are attached in correspondence with the light emitting elements, The lens is attached to each lens holding portion, and is arranged on the front side of each printed wiring board and is disposed in the opening of the container, and the printed wiring board is divided into a plurality of parts, The lens holder is divided into a plurality of parts corresponding to the printed wiring board.

  According to this configuration, the printed wiring board can be incorporated into a predetermined position of the container body in units of the printed wiring portion constituting the unit body by mounting LEDs as a plurality of light emitting elements. The lens holder can also be incorporated at a predetermined position of the body in units of a lens holder portion that is a unit body by attaching a plurality of lenses. In other words, each part is not assembled into the body in an individual state, but is formed into a part unit having a weight and size that is easy to handle and integrated into a predetermined position of the body. The amount of misalignment is also reduced.

  In the above configuration, a heat dissipating member provided on the back surface of the printed wiring board opposite to the side on which the light emitting element is mounted, and a heat dissipating belt provided on the outer surface of the container body for dissipating heat from the heat dissipating member. A configuration including the above can be adopted.

  It is possible to dissipate the LED through the radiator and prevent the LED from overheating, and maintain the appropriate brightness of the LED over a long period of time. Further, the heat radiation belt for radiating the heat of the heat radiating body is provided outside the container, so that the LED can be radiated more efficiently.

  In the above configuration, the outer surface of the container body is baked and painted while leaving a part thereof, and the radiator body is attached to the inner surface of the container body by contacting a part of the radiator body, A configuration in which the heat-dissipating belt is attached in contact with a part of the outer surface that is not baked can be employed.

  According to this configuration, the outer surface portion of the container body on which the heat radiating belt is not attached is baked, so that the surface of the container body can be prevented from being rusted by salt damage or the like. On the other hand, it is possible to prevent the outer surface portion to which the heat radiating cover is attached in contact with the heat radiating cover from being rusted. In addition, at the abutting portion between the radiating cover and the container that is not baked, the heat on the container side is well transmitted to the radiating cover side without the heat radiation being disturbed by the baked coating, thereby improving the heat dissipation.

  In the above configuration, a hole provided in a central portion of the printed wiring board and a side electrically connected to the plurality of light emitting elements, and the side on which the light emitting element of the printed wiring board is mounted from the hole. A configuration including a signal line led to the back surface on the opposite side can be adopted.

  According to this configuration, since the signal line is drawn out from the hole provided in the central portion of the printed wiring board, the work can be simplified when assembling the projector by combining the divided printed wiring board and the lens holder. it can.

  The said structure WHEREIN: The said printed wiring board and the said lens holder can employ | adopt the structure fixed to the said heat radiator and integrated.

  According to this structure, a heat radiator, the said printed wiring board, and the said lens holder can be integrated previously, and it can incorporate in this container in this integrated state. As a result, the number of assembly work steps can be reduced, and the amount of shift between components can be further reduced.

  The said structure WHEREIN: The structure which provided the constant current circuit which has IC for regulators in the said printed wiring board is employable.

  According to this configuration, overcurrent flowing through the LED can be prevented by controlling the constant current circuit, and appropriate brightness can be maintained over a long period of time.

  In the above configuration, the regulator IC may be mounted at an outer peripheral end of the printed wiring board, and a heat sink may be attached to the outer surface of the regulator IC package.

  According to this configuration, heat generated by the regulator IC and heat generated in the printed wiring board can be radiated through the heat radiating plate attached to the outer surface of the IC package.

  The said structure WHEREIN: The structure in which the said several light emitting element contains the light emitting element from which luminescent color differs can be employ | adopted.

  According to this configuration, for example, adjustment to a desired color can be performed using LEDs such as white, red, green, and blue, thereby enabling a colorful light-up and the like.

  According to the present invention, each component such as an LED, a printed wiring board, and a lens is not incorporated in the container in an individual component state, and is grouped into a unit unit having a weight and a size that are easy to handle. Since it is incorporated, the assembly man-hour is reduced, and the amount of deviation between parts is also reduced. As a result, an LED projector with good assembly workability and high assembly accuracy can be obtained.

  In addition, the heat generated when the LED emits light is radiated to the outside air by a radiator or the like, and overcurrent to the LED is prevented by a constant current circuit, so that proper brightness is maintained over a long period of time. be able to.

  Furthermore, since it is possible to light up with movement, the degree of attention of the night view is increased, and the viewer can enjoy the color of light.

It is a top view shown in the state where the front frame door of the LED floodlight in the embodiment of the present invention was removed. FIG. 2 is a vertical sectional view taken along line AA in FIG. 1. It is a BB line expanded sectional view of Drawing 1. FIG. 3 is an enlarged cross-sectional view taken along the line CC in FIG. 1. It is a top view of the printed wiring board unit in a LED projector same as the above shown with the LED mounted. It is a top view which shows the lens holder of a LED projector same as the above. It is a circuit diagram which shows an example of the drive circuit of LED.

  DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the invention will be described with reference to the accompanying drawings. 1 to 7 show an LED projector according to an embodiment of the present invention. In the following description, the upper side in the vertical direction in FIG. 2 is described as the front, the lower side is the rear, and the front is the irradiation direction.

  1 and 2, the LED projector 10 includes a container body 11. The body 11 has a substantially hemispherical housing part 11a with front and rear surfaces opened, and a bolt (not shown) at the rear part of the housing part 11a by closing the opening part 12a on the rear surface side of the housing part 11a. It is comprised by the cylindrical socket attaching part 11b etc. which were fixed by. In addition, the outer surface of the housing part 11a and the socket attachment part 11b is baked for rust prevention.

  A power circuit unit 13 is disposed in the socket mounting portion 11b, and a control circuit unit 14 is disposed in the rear portion of the housing portion 11a. The power supply circuit unit 13 is provided with a power line 16 that is led out through the hole 15 provided in the socket mounting portion 11b. The control circuit unit 14 is also led through the hole 15 and led out to the outside. The signal line 17 is attached.

  Further, around the opening 12b on the front side in the housing portion 11a, the heat radiating body 18, the printed wiring board 19, a plurality of LEDs 20, 20,... In order from the inside (rear side) of the housing portion 11a. A plurality of lenses 21, 21... Are arranged.

  The heat dissipating body 18 is substantially the same size as the opening 12b on the front side of the housing portion 11a and is provided on a disk-shaped aluminum heat dissipating plate 22 and substantially the entire back surface of the heat dissipating plate 22. It is also composed of heat radiating fins 23 made of aluminum. The heat radiating body 18 is fixed to the inner surface of the housing portion 11a with a screw 24 by fixing a mounting portion 22a bent at a substantially right angle from the outer peripheral portion of the heat radiating plate 22 to the back surface (rear surface) side. Are attached to the housing part 11. In addition, a hole 18 a through which the signal line 25 extending from the control circuit unit 14 passes is provided at the center of the radiator 18. The signal line 25 is electrically connected to the plurality of LEDs 20 and led from the hole 26 to the back surface of the printed wiring board 19 opposite to the side where the LEDs are mounted.

  The printed wiring board 19 is formed in a disc shape as a whole, and the heat dissipation is performed by making the center position of the printed wiring board 19 substantially coincide with the center position of the housing portion 11a and the center position of the heat radiator 18. Mounted on the plate 22. The center of the housing portion 11a substantially coincides with the center of the heat radiating body 18. Further, a hole portion 26 through which the signal line 25 extending from the control circuit unit 14 through the central hole 18a of the heat radiating body 18 passes is provided in the central portion of the printed wiring board 19. Then, the printed wiring board 19 causes the heat generated on the printed wiring board 19 side to be transferred to the radiator 18 side to dissipate the heat, and the entire back surface of the printed wiring board 19 is brought into close contact with the heat radiating plate 22 to release the heat. Arranged on the plate 22. In addition, a plurality of circuit wiring terminals (not shown) are formed on the front surface (front surface) side of the printed wiring board 19, and the LEDs 20, 20,... Are mounted on the circuit wiring terminals, respectively.

  The printed wiring board 19 is divided radially outward from the substantially central position of the central hole 26. In this example, the printed wiring board 19 is equally divided into four printed wiring board portions 19a, 19b, 19c, and 19d. ing. That is, by dividing one printed wiring board 19 into a plurality of printed wiring board portions 19a to 19d, the weight of one printed wiring board portion 19a to 19d can be reduced, and the work at the time of assembling can be facilitated. It is comprised so that it may become. A plurality of the LEDs 20, 20,... Are attached radially to the respective printed wiring board portions 19a to 19d from the center position toward the outside. FIG. 5 is a diagram schematically showing a state in which the LEDs 20, 20,... Are mounted at predetermined positions (positions where circuit wiring terminals are provided) of the printed wiring board portion 19a (or 19b, 19c, 19d). The printed wiring board 19 is provided with a constant current circuit having a regulator IC 27. Here, a plurality of regulator ICs 27, 27... For controlling the lighting of the LEDs 20, 20... Are respectively soldered and mounted on the outer peripheral ends of the printed wiring board portions 19 a to 19 d.

  Further, in each of the printed wiring board portions 19a to 19d, an aluminum heat radiating belt 28 as a belt-like heat radiating plate is provided for each of the printed wiring board portions 19a to 19d. It is attached to the outer surface with mounting screws 35.

  Therefore, the printed wiring board portions 19a to 19d in this example are prepared in a unitized state in which the LEDs 20, 20,..., The regulator ICs 27, 27,. The unitized printed wiring board portions 19a to 19d are set on the heat radiating plate 22 in a plane, and signal lines 25, 25... Extending from the control circuit unit 14 are connected to the printed wiring board portions. When connected to 19a to 19d, the respective printed wiring board portions 19a to 19d that are unitized can be easily assembled at predetermined positions of the heat radiating plate 22, respectively.

  The plurality of lenses 21, 21... Are respectively attached to a resin lens holder 29 having a disk shape that covers the front surface of the heat radiating plate 22. The lens holder 29 is divided radially outward from a substantially central position of the lens holder portion 29 so as to correspond to the printed wiring board portions 19a to 19d of the printed wiring board 19, and in this example, four lens holders 29 are provided. The lens holder portions 29a, 29b, 29c, and 29d are equally divided. The lens holder portions 29a to 29d are provided with lens holes 30, 30... As lens holding portions corresponding to the LEDs 20, 20,... On the printed wiring board portions 19a to 19d, respectively. The LEDs 20, 20,... Are respectively mounted in the 30, 30,. FIG. 6 is a diagram schematically showing a state in which the lenses 21, 21... Are attached to the divided lens holder portion 29a (or 29b, 29c, 29d). Accordingly, in the same manner as the printed wiring board 19, the lens holder 29 is also divided into a plurality of lens holder portions 29a to 29d, so that one lens holder portion 29a, 29b, 29c, 29d is obtained. The weight can be reduced, and the work at the time of assembly or the like is facilitated.

  The lens holder portions 29a to 29d, the printed wiring board portions 19a to 19d, and the heat radiating plate 22 are provided with mounting holes at corresponding positions. The mounting holes 36a, 36a... On the printed wiring board portions 19a to 19d are shown in FIG. 5, and the mounting holes 36b, 36b on the lens holder portions 29a to 29d are shown in FIG. Then, the lens holder 29 is further set in a plane via spacers 38 on the printed wiring board 19 set in a plane on the radiator plate 22. Then, from the lens holder 29 side, the mounting screw 36 is screwed into the mounting hole (not shown) of the heat radiating plate 22 through the mounting hole 36b of the lens holder 29 and the mounting hole 36a of the printed wiring board 19 in order. 31 is attached, and the printed wiring board 19 (printed wiring board portions 19a to 19d) and the lens holder 29 (lens holder portions 29a to 29d) are part of the radiator 18 by tightening the mounting screws 31. It is fixed to 22 and integrated. Further, in the state in which the printed wiring board portions 19a to 19d and the lens holder portions 29a to 29d are fixed in this way, the center positions of the lenses 21, 21... Attached to the lens holder portions 29a to 29d and the printed wiring. The light emission centers of the LEDs 20, 20... Mounted on the board portions 19 a to 19 d coincide with each other, and light emitted from the LEDs 20, 20. Can be irradiated.

  In this way, the housing in which the radiator 18, the printed wiring board 19, the LEDs 20, 20..., The regulator ICs 27, 27, the radiator belts 28, 28. A waterproof cover 33 equipped with a light transmissive glass 32 is attached to the front surface of the portion 11a.

  On the other hand, on the outside of the housing part 11a, an aluminum radiating belt 34 is attached over substantially the entire circumference of the housing part 11a, fixed by mounting screws 37. As described above, the outer surfaces of the housing 11a and the socket mounting portion 11b are baked for rust prevention. However, heat generated on the housing portion 11a side is transmitted to the heat radiating belt 34 side, and the heat radiating is performed. In order to enhance the effect of radiating heat from the belt 34 to the outside air, the outer surface portion of the housing portion 11a to which the heat radiating belt 34 is attached in contact (the range indicated by the symbol S in FIG. 2) is not provided with a baking coating. I have to. The heat radiating belt 34 is attached in direct contact with the outer surface of the housing portion 11a.

  FIG. 7 shows an example of a drive circuit for lighting the LEDs 20, 20,. The drive circuit in this example is provided with a load current adjusting resistor formed by connecting resistors R1, R2 and LED 40 in series with the regulator ICs 27, 27. The five driven LEDs 20, 20,... Are connected in series to a resistor so that the load adjusting LED 40 and the five LEDs 20, 20,. It is configured. In addition, the driving circuit can drive the LED 40 used in the constant current circuit for preventing the overcurrent to the LEDs 20, 20... In addition to the driven LEDs 20, 20. And the overcurrent which flows into LED20,20 ... is prevented by control of this constant current circuit, Therefore Appropriate brightness can be maintained over a long period of time.

  Therefore, the LED projector 10 shown as this embodiment has a plurality of printed wiring boards 19 on which a plurality of LEDs 20, 20,... And regulator ICs 27, 27,. The printed wiring board parts 19a to 19d that are unitized can be integrated into a predetermined position of the housing part 11a of the container body 11 as a unit. Further, the lens holder 29 to which the plurality of lenses 21, 21... Arranged in front of the LEDs 20, 20. Each of the divided lens holder parts 29a to 29d can be integrated into a predetermined position of the housing part 11a. That is, the individual parts are not assembled into the housing part 11a of the container body 11 but are assembled into a predetermined part of the housing part 11a as a part unit having a weight and size that is easy to handle. In addition, the amount of deviation between components is reduced, and an LED projector with good assembling workability and assembling accuracy can be obtained.

  Further, the heat generated by the LEDs 20, 20,... Is transmitted to the heat radiating belt 34 via the heat radiating belt 28, the heat radiating body 18, etc., and is radiated to the outside air, so that the LEDs 20, 20 are prevented from overheating. The appropriate brightness of the LEDs 20, 20... Can be maintained over a long period of time.

  It should be noted that the present invention can be variously modified without departing from the spirit of the present invention, and the present invention naturally extends to the modified ones.

  For example, the plurality of LEDs 20, 20... Have different emission colors, for example, white, red, green, blue, etc. LEDs 20, 20... If the color is controlled by a computer or the like, it is possible to enjoy changing colors.

  As described above, the present invention enables a moving light-up instead of the conventional light-up of a high-rise building or tower, so that the attention of the night view is increased and the color of light to the viewer is increased. It can be used as an indoor and outdoor lighting device.

DESCRIPTION OF SYMBOLS 10 LED projector 11 Body 11a Housing part 11b Socket attachment part 12a Rear surface opening part 12b Front surface opening part 18 Radiator 18a Hole 19 Printed wiring board 19a-19d Printed wiring board part 20 LED
21 Lens 22 Heat Dissipating Plate 23 Heat Dissipating Fin 26 Hole 27 Regulator IC
28 Heat dissipation belt 29 Lens holders 29a to 29d Lens holder part 30 Lens hole (lens holding part)
32 Glass 33 Waterproof cover 34 Heat-dissipating belt S Parts not baked

Claims (8)

A body with an open front;
A printed wiring board housed in the opening of the vessel, and
A plurality of light emitting elements mounted on the printed wiring board;
A plurality of lenses for irradiating the light from the light emitting element forward, respectively;
A plurality of lens holding portions to which the lenses are attached in correspondence with the light emitting elements; the lenses are attached to the lens holding portions; A lens holder that is housed in the unit,
The printed wiring board is divided into a plurality of parts,
The projector according to claim 1, wherein the lens holder is divided into a plurality of parts corresponding to the printed wiring board. A radiator provided on the back surface of the printed wiring board opposite to the side on which the light emitting element is mounted;
The light projector according to claim 1, further comprising: a heat dissipating belt that is provided on an outer surface of the container and dissipates heat of the heat dissipating member.   The outer surface of the container body is baked and painted while leaving a part thereof, and the heat radiating body is attached to the inner surface of the container body by contacting a part of the heat radiating body. The projector according to claim 2, wherein the heat dissipating belt is attached to a part of the outer surface which is not in contact. A hole provided in a central portion of the printed wiring board;
4. The apparatus according to claim 1, further comprising: a signal line that is electrically connected to the plurality of light emitting elements and that is led from the hole portion to a back surface opposite to the side on which the light emitting element is mounted of the printed wiring board. Floodlight.   5. The projector according to claim 1, wherein the printed wiring board and the lens holder are fixed to and integrated with the heat radiator. 6.   6. The projector according to claim 1, wherein a constant current circuit having a regulator IC is provided on the printed wiring board.   7. The projector according to claim 6, wherein the regulator IC is mounted at an outer peripheral end portion of the printed wiring board, and a heat radiating plate is attached to an outer surface of the regulator IC package. .   The light projector according to claim 1, wherein the plurality of light emitting elements include light emitting elements having different emission colors.

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