JP5320548B2 - Lighting device - Google Patents

Description

  The present invention relates to a lighting device using a heat sink as a heat radiating means of a light source unit having a light emitting element.

  In general, LEDs have higher efficiency and longer life than incandescent bulbs and halogen bulbs, and in particular, as white LEDs have recently become brighter, illumination devices using the white LEDs have become widespread.

Further, an LED lighting device using a plurality of LEDs as a light source of a spotlight used for lighting in a theater or a television studio has been developed (see, for example, Patent Documents 1 and 2).
JP 2005-158699 A JP 2007-305455 A

  However, in such a conventional lighting device, a heat sink may be used in order to avoid an excessive increase in the temperature of the LED during lighting. In addition, a cooling fan is sometimes used to forcibly cool the heat sink. However, since the cooling fan is always operated, there is a problem that noise is large and electric power is wasted and the life of the cooling fan is shortened. In particular, there is a problem that the cooling fan reaches the end of its life before the long-life LED is exhausted, the life of the spotlight as a whole is shortened, and the long-life characteristics of the LED cannot be fully utilized. .

  Then, although the method of carrying out natural air cooling only with a heat sink is also considered, this has the subject that exhaust heat performance falls significantly. In order to solve this problem, there is a new problem that the heat sink is increased in size and weight.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an illumination device that can reduce the load of a cooling fan and extend the life and improve the heat dissipation effect. And

The illumination device according to claim 1 is provided in the instrument body, including a light source unit having a light emitting element, a heat sink configured to be able to exchange heat with the light source unit, and a tiltable instrument body having a cooling fan for blowing air to the light source unit; A heat pipe which is arranged so as to be capable of exchanging heat with the light source part and tilts as the instrument body tilts, and a second heat sink which is arranged so as to be able to exchange heat with the heat pipe; an angle sensor which detects the tilt angle of the instrument body And, depending on the tilt angle of the instrument body detected by the angle sensor , the cooling fan is operated when the heat pipe has a tilt angle that reduces the heat transfer performance of transferring heat to the second heat sink to dissipate heat. And control means for controlling the cooling fan so as not to operate at other times.

A lighting device according to claim 2 is a tiltable instrument body having a light source section having a light emitting element, a heat sink configured to be able to exchange heat with the light source section, and a cooling fan for blowing air to the light source section; An angle sensor to detect; and a control means for controlling the operation of the cooling fan in accordance with the tilt angle of the instrument body detected by the angle sensor, wherein the cooling fan has different air blowing directions to the heat sink. The control means has a plurality of units, and the control means is configured to selectively operate a cooling fan that blows air in a direction of natural convection of air that cools the heat sink according to a detection angle of the instrument body by the angle sensor. And

  In the above invention, the light source unit may be a solid light emitting element such as an LED or an organic EL as the light emitting element, and a plurality of light emitting elements may be arranged in a planar shape, for example. As the heat sink, for example, a heat radiating fin may be used, and it is configured to be able to exchange heat with the light source unit. For example, a heat radiating fin may be provided directly behind the light source unit. The angle sensor may be any sensor that can detect the tilt angle of the instrument body, and may be a gravity sensor or acceleration sensor that detects the direction of gravity, or a mechanical sensor such as a potentiometer or a sliding resistance type.

  The angle sensor may be provided on a control circuit board on which control means such as a microprocessor for controlling the operation of the cooling fan is mounted.

  According to the first aspect of the present invention, the operation of the cooling fan is controlled by the control means so as to operate only when cooling is required according to the tilt angle of the instrument body, and is not always operated. For this reason, since the load of a cooling fan can be reduced, the lifetime can be extended.

Further, since the heat generated by the light source unit is radiated twice by both the heat sink with the cooling fan and the second heat sink with the heat pipe, the heat dissipation effect can be improved. In addition, the cooling fan is operated only when the tilt angle of the appliance body, that is, the tilt angle of the heat pipe is an angle at which the heat transfer performance for transferring heat to the second heat sink to dissipate heat is reduced. Since no other operation is performed, the load on the cooling fan can be reduced, the life can be extended, and the noise can be reduced.

According to the invention of claim 2, since only the cooling fan that blows air in the same direction as the natural convection of the heat sink that changes according to the tilt angle of the instrument main body is selected and operated among the plurality of cooling fans, the cooling fan Can reduce the load. Moreover, since it blows from a cooling fan in the same direction as the natural convection direction of the air which cools a heat sink, the heat dissipation effect of a heat sink can be improved. Further, since the heat radiation effect is improved and the number of rotations of the cooling fan per unit time can be reduced, the load on the cooling fan can be further reduced and the life can be extended.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. In addition, the same code | symbol is attached | subjected to the same or an equivalent part in these several accompanying drawings.

  FIG. 1 is a schematic side view of the lighting device 1 according to the first embodiment of the present invention, FIG. 2 is a perspective view of a principal part of the lighting device 1, and FIG. 3 is a schematic plan view of the light source unit. 4 is a schematic side view of the illumination device 1 tilted upward, and FIG. 5 is a schematic side view of the illumination device 1 tilted downward.

  As shown in FIGS. 1 to 5, the lighting device 1 includes a rectangular tube-shaped instrument body 2 that is long in the horizontal direction in the drawings. The fixture body 2 includes a light source unit 3, a lens unit 4 concentrically fixed to the front surface (the left side surface in the drawing), and a second radiating fin 5 which is an example of a second heat sink. It is configured.

  The lens unit 4 accommodates projection lenses 6 and 6 in a rectangular tube-like case 4a, and projects light indicated by a thick arrow in front of the lens.

  The light source unit 3 is disposed on the upper surface of the rectangular tube lamp case 7 in FIG. 1 with the second heat radiating fins 5 as an example of the second heat sink exposed to the outside. Inside, the light source part 8, the 1st radiation fin 9 which is an example of a 1st heat sink, and the cooling fan 10 are accommodated.

  Further, as shown in FIG. 3, the light source unit 3 houses the power supply device 11, the lighting circuit board 12, the control circuit board 13, and the angle detection sensor 14 in the lamp case 7 on both sides of the first radiating fins 9. doing.

  The light source unit 8 is configured as a planar light source by arranging a plurality of LEDs on a rectangular plate-shaped light source arrangement plate in a matrix, for example. These LEDs are electrically connected to the lighting circuit board 12, and the lighting circuit board 12 is mounted with a lighting circuit that controls turning on / off of the LEDs of the light source unit 8. The front plate of the lamp case 7 in front of the light source unit 8 has an aperture 7a through which light emitted from the light source unit 8 passes.

  The rear surface of the light source unit 8 is fixed to the substantially central portion of the outer surface (front surface) of the fin base 9 a of the first heat radiating fin 9. The lamp case 7 opens the back and bottom surfaces of the plurality of fins 9b, 9b,... Of the first heat dissipating fins 9 to the outside and exhausts heat to the outside below the bottom surface by the cooling fan 10.

  As shown in FIGS. 1 and 2, a pair of left and right electrodes having heat conductivity are provided on the outer surface (front surface) of the fin base 9 a of the first radiating fin 9 in close contact with, for example, the light source unit 8. The lower ends of the inverted L-shaped heat pipes 15 and 15 are attached. The pair of left and right inverted L-shaped heat pipes 15 and 15 have their upper end portions slightly extended upward in the vertical direction, and then bent at a substantially right angle when protruding slightly from the upper surface of the lamp case 7 to the outside. The lamp case 7 extends rearward along the outer surface of the upper end of the lamp case 7, and is fixed in close contact with the outer bottom surface of the fin base 5 a of the second radiating fin 5.

  Each heat pipe 15 encloses a volatile liquid as a working fluid in a cylindrical sealed container made of a material having high thermal conductivity, and when one end (heating unit) is heated, the working fluid evaporates to generate latent heat. When absorbed and cooled at the other end (cooling section), heat is transferred by a cycle that condenses and releases latent heat. Therefore, it is necessary to set the horizontal part 15a which is a cooling part to a position higher than the vertical lower end part 15b which is a heating part.

  For this reason, when the horizontal central axis Oa of the cooling part (horizontal part) 15a is smaller than a predetermined angle (for example, 45 °) by the elevation angle θ and φ with respect to the horizontal line H, the heat of the heat pipes 15 and 15 is increased. Conductivity decreases. Since the horizontal central axis Oa of the cooling unit 15a is substantially parallel to the horizontal central axis Ob of the instrument body 2, the elevation angle of the instrument body 2 is substantially the same as the elevation angle of the cooling part 15a.

  The angle detection sensor 14 is a gravity sensor or an acceleration sensor, and detects the tilt angle of the instrument body 2, that is, the tilt angle with respect to the horizontal line H of the horizontal central axis Oa of the cooling portion 15a of the heat pipe 15, and the tilt angle detection signal. Is supplied to a microprocessor which is an example of a control means mounted on the control circuit board 13.

  When the microprocessor determines that the input tilt angle detection signal has reached a predetermined tilt angle (for example, the depression angle θ is less than 45 ° or the elevation angle φ is 45 ° or more), the first cooling fan 3 has a control function of operating the cooling fan 10 at a preset number of revolutions per unit time, and otherwise stopping the operation of the cooling fan 10.

  The power supply device 11 is electrically connected to the control circuit board 13, the lighting circuit board 12, the cooling fan 10, and the angle detection sensor 14, and supplies necessary power thereto.

  Next, the effect | action of this illuminating device 1 is demonstrated.

  When a lighting switch (not shown) is turned on, the LED of the light source unit 8 is turned on by the lighting circuit of the lighting circuit board 12. As a result, the light emitted from the light source unit 8 of the LED that emits light is condensed by the projection lenses 6 and 6 through the aperture 7a and then emitted to the outside.

  The tilt angle of the instrument body 2 at this time is detected by the angle detection sensor 14, and the detection signal is given to the microprocessor of the control circuit board 13. When the microprocessor determines that the tilt angle of the instrument body 2 is equal to or less than a predetermined value, the cooling fan 10 is stopped without being operated.

  The light source unit 8 generates heat due to the light emitted from the LED, and the generated heat is naturally radiated by the entire first radiation fin 9 through the fin base 9a in which the back surface of the light source unit 8 is in direct contact.

  Further, the heat generated by the light source unit 8 is absorbed by the heating unit 15b at the lower end in FIG. 1 of the heat pipe 15, and the working fluid is vaporized here. Further, the vaporized working fluid is thermally conducted to the upper cooling unit 15a.

  The cooling portion 15a is transferred to the entire second radiating fin 5 through the fin base 5a. Since the second radiating fin 5 is exposed to the outside air, it is naturally cooled by the outside air.

  In this way, the heat generated by the light source unit 8 is cooled by the second radiating fins 5 and the first radiating fins 9. The working fluid in the heat pipe 15 cooled by the second cooling fins 5 is solidified (liquefied) and dropped again onto the heating unit 15b by gravity. Thereafter, heating and cooling are repeated to generate heat from the light source unit 8. This is repeatedly transmitted to the second radiating fin 5.

  However, when the illumination device 1 is tilted upward as shown in FIG. 4 and the elevation angle φ reaches a predetermined value (for example, 45 °) or more, the cooling unit 15a of the heat pipe 15 is positioned higher than the heating unit 15b. Therefore, the heat conduction performance of the heat pipe 15 is lowered, and the heat radiation effect by the second heat radiation fin 5 is lowered.

  Therefore, the microprocessor that has received the tilt angle detection signal from the angle detection sensor 14 gives an ON signal to the cooling fan 10 and starts operation at a preset rotational speed.

  Thereby, since the 1st radiation fin 9 is forcibly air-cooled by the cooling fan 10, the fall of the thermal radiation capability by the 2nd radiation fin 5 can be compensated.

  Similarly, as shown in FIG. 5, when the instrument body is tilted downward in the figure and the depression angle θ reaches a predetermined value (for example, 45 °) or more, the cooling fan 10 is operated by the microprocessor, and the first Since the one radiating fin 9 is forcibly air-cooled, the light source unit 8 can be sufficiently cooled.

  Therefore, according to this lighting device 1, the operation of the cooling fan 10 is controlled according to the tilt angle of the instrument body 2 by the microprocessor of the control means, and is not always operated. For this reason, since the load of the cooling fan 10 can be reduced, the lifetime can be extended.

  Moreover, since the heat generated by the light source unit 8 is radiated twice by both the first radiating fin 9 with the cooling fan 10 and the second radiating fin 5 with the heat pipe 15, the heat radiating effect is improved. Can do.

  FIG. 6 is a schematic side view of a lighting device 1A according to the second embodiment of the present invention. This illuminating device 1A is the same as the illuminating device shown in FIG. 1 and the like, except that the second radiating fin 5, the heat pipe 15, and the cooling fan 10 are deleted, The first and second cooling fans 20 and 21 are newly provided, and the function of controlling the operation of the first and second cooling fans 20 and 21 is given to the microprocessor of the control circuit board 13. The point has the main characteristics.

  That is, in general, when cooling fins are forcibly cooled by a cooling fan, cooling efficiency of the cooling fins can be improved by blowing air from the cooling fan in the same direction as the natural convection direction of the cooling fins.

  Therefore, the microprocessor has a control function for selectively operating one of the first and second cooling fans 20 and 21 in accordance with the tilt angle of the instrument body 2 based on such knowledge.

  That is, in order to improve the heat dissipation effect of the heat dissipation fins 9 in the memory, the microprocessor has various tilt angles of the instrument body 2 and the first and second cooling fans 20 and 21 according to the tilt angles. The selection of either one or both and the number of rotations during the operation are recorded in advance as a data table, and this data table is referred to according to the detected angle detected by the angle detection sensor 14. Thus, the operation of the first and second cooling fans 20 and 21 is controlled.

  Therefore, according to this illuminating device 1A, it blows in the substantially same direction as the natural convection of the radiation fin 9 which changes according to the tilt angle of the instrument main body 2 among the two first and second cooling fans 20 and 21. Since one of the first and second cooling fans 20 and 21 that can be operated is selected and operated, the load on the first and second cooling fans 20 and 21 can be reduced. Further, since the cooling fans 20 and 21 are blown in the same direction as the natural convection direction of the radiating fins 9 and forced air cooling is performed, the radiating effect of the radiating fins 9 can be improved. Furthermore, since the number of revolutions per unit time of the first and second cooling fans 20 and 21 can be reduced by the improvement of the heat dissipation effect, the load on these cooling fans 20 and 21 can be further reduced and the life can be extended. Can do.

  In the above-described embodiment, the case where a gravity sensor or an acceleration sensor is used as the angle detection sensor has been described. However, the present invention is not limited to this. For example, a potentiometer or a sliding resistance type angle sensor may be used. Good. And when attaching this potentiometer to the illuminating device 1, you may provide the angle detection rotating shaft of a potentiometer in connection with tilting of the instrument main body 2, for example in the support part which supports the instrument main body 2 so that tilting is possible.

The side surface schematic diagram of the illuminating device which concerns on the 1st Embodiment of this invention. The principal part perspective view of FIG. The plane schematic diagram of the light source unit shown in FIG. The side surface schematic diagram when controlling the tilt angle of the illuminating device shown in FIG. 1 upward. The side surface schematic diagram when controlling the tilt angle of the illuminating device shown in FIG. 1 downward. The side surface schematic diagram of the illuminating device which concerns on the 2nd Embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,1A ... Illuminating device, 2 ... Appliance main body, 3 ... Light source unit, 4 ... Lens unit, 5 ... 2nd radiation fin (heat sink), 7 ... Lamp case, 8 ... Light source part, 9 ... 1st radiation fin (Heat sink), 10 ... cooling fan, 12 ... lighting circuit board, 13 ... control circuit board (control means), 14 ... angle detection sensor, 15 ... heat pipe, 15a ... heating part of heat pipe, 15b ... cooling of heat pipe Part, 20, 21 ... 1st, 2nd cooling fan.

Claims (2)

A light source unit having a light emitting element, a heat sink configured to be able to exchange heat with the light source unit, and a tiltable instrument body having a cooling fan for blowing air to the heat source;
A heat pipe which is provided in the instrument main body and is disposed so as to be capable of exchanging heat with the light source unit and tilts as the instrument main body is tilted; and a second heat sink disposed so as to be capable of exchanging heat with the heat pipe;
An angle sensor for detecting the tilt angle of the instrument body;
Depending on the tilt angle of the instrument body detected by the angle sensor , the cooling fan is operated when the heat pipe has a tilt angle that reduces the heat transfer performance of transferring heat to the second heat sink to dissipate heat. Control means for controlling the cooling fan not to operate at times;
An illumination device comprising: A light source unit having a light emitting element, a heat sink configured to be able to exchange heat with the light source unit, and a tiltable instrument body having a cooling fan for blowing air to the heat source;
An angle sensor for detecting the tilt angle of the instrument body;
Control means for controlling the operation of the cooling fan in accordance with the tilt angle of the appliance body detected by the angle sensor;
Equipped with,
The cooling fan has a plurality of air blowing directions for blowing air to the heat sink, and the control means blows air in a natural convection direction of air that cools the heat sink according to a detection angle of the instrument body by the angle sensor. A lighting device configured to selectively operate a cooling fan .

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