JP2012160341A - Lighting device and bathroom lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting device that can secure high heat radiation performance and have electrically and optically long lifetime by restraining internal dew condensation.SOLUTION: The lighting device 100 includes an LED module 110, a case for retaining the LED module 110 in an internal space, a fan 160 for respectively performing air suction and air exhaustion between the internal space and an external space of the case, and a control circuit 150 for controlling the fan 160 to suck air from the external space to the internal space while lighting up the LED module 110 and to exhaust air from the internal space to the external space while putting out the LED module 110.

Description

  The present invention relates to a lighting device using a semiconductor light emitting element such as an LED (Light Emitting Diode), and a bathroom lighting device integrated with a bathroom ventilation fan.

  As an example of conventional bathroom lighting, a bathroom lighting apparatus integrated with a bathroom ventilation fan that is integrally formed with a ventilation fan that exhausts air in the bathroom is known. Specifically, there is known a lighting device arranged at the center of a louver installed on the ceiling of a bathroom.

  An LED module may be employed as the light emitting module in the bathroom ventilation fan-integrated lighting device having the above configuration. Moreover, the housing holding an LED module may be formed with resin from an insulating viewpoint.

JP 2008-309453 A JP 2005-158746 A

  However, it cannot be said that the heat dissipation performance of the resin housing is sufficient for LED modules that generate a large amount of heat. The heat dissipation structure of the lighting device using the LED module is disclosed in, for example, Patent Documents 1 and 2 and the like, but when applied to a bathroom lighting device integrated with a bathroom ventilation fan, the following problems may occur. .

  For example, when the heat radiating plate is enlarged to improve the heat radiating performance, the distance between the diffusing plate and the LED module is reduced, and another problem that a bright spot is generated may occur. Further, when the lighting device having the above-described configuration is used in a high humidity environment, condensation occurs inside the housing, and there is a concern that the optical member is deteriorated and electrical safety is lowered.

  The present invention has been made in view of the above circumstances, and provides a lighting device and a bathroom lighting device having a long electrical and optical life by ensuring high heat dissipation performance and suppressing internal condensation. The purpose is to do.

  An illumination device according to an aspect of the present invention includes a light emitting module, a housing that holds the light emitting module in an internal space, an intake and exhaust unit that performs intake and exhaust between the internal space and the external space of the housing, And a control unit that controls the intake / exhaust unit so that air is sucked into the internal space from the external space while the light emitting module is turned on and exhausted from the internal space to the external space while the light emitting module is turned off.

  According to the above configuration, when the light-emitting module is turned on, low-temperature air is sucked to perform cooling, and when the light-emitting module is turned off, high-humidity air is discharged to suppress the occurrence of condensation. As a result, high heat dissipation performance can be ensured and a long electrical and optical life can be realized.

  As an example, the intake / exhaust portion may be a fan. The control unit may rotate the fan in one direction while the light emitting module is turned on to inhale, and rotate the fan in the other direction to force exhaust while the light emitting module is turned off. .

  As another example, the intake / exhaust section may be a fan. The control unit rotates the fan in one direction to suck in air while the light emitting module is turned on, stops the fan while the light emitting module is turned off, and stops the temperature between the internal space and the external space. You may exhaust naturally using a gradient. Note that “stop the fan” merely means that the control unit does not actively drive the fan, and the fan is driven by other power (for example, air exhausted from the lighting device). I will not prevent it.

  Further, the intake / exhaust section may include a moisture absorption section that removes water vapor contained in the intake air. Thereby, since the quantity of the water vapor | steam which penetrate | invades into the inside of an illuminating device can be reduced, dew condensation can be prevented more effectively.

  The housing may include a partition that partitions the internal space into a first space and a second space. The partition wall may be formed with a communication hole for communicating the first and second spaces. The light emitting module may be disposed in the first space, and the intake / exhaust unit and the control unit may be disposed in the second space. By disposing the light emitting module and the control unit in separate spaces, the control unit can be prevented from malfunctioning or malfunctioning due to heat generated from the light emitting module.

  Furthermore, the lighting device is disposed in the second space and dissipates heat, and the heat transfer unit is disposed in the first space and transfers heat generated by the light emitting module to the heat dissipating unit. And may be provided. And the said intake / exhaust part may be arrange | positioned in the position which faces the said thermal radiation part. Thereby, since a thermal gradient is generated in the path from the light emitting module to the intake / exhaust portion, the heat dissipation is further improved.

  The housing includes an opening, and a housing that holds the light emitting module therein, and a translucent plate that is attached to the opening of the housing and transmits light output from the light emitting module. It may be configured.

  The contact portion between the housing and the translucent plate may be sealed with a sealing member. Thereby, especially when used for the lighting for bathrooms, it can prevent that splashes, such as a shower, penetrate | invade directly into the inside of an illuminating device.

  Furthermore, the control unit may turn on or off the light emitting module in response to an instruction from a user.

  A bathroom lighting device according to one embodiment of the present invention is a lighting device installed on a ceiling of a bathroom. Specifically, the lighting device described above and a louver that is installed adjacent to the lighting device and exhausts air in the bathroom.

  ADVANTAGE OF THE INVENTION According to this invention, while ensuring high heat dissipation performance and suppressing internal dew condensation, the illuminating device and bathroom lighting device which are electrically and optically long-lived can be obtained.

1 is a schematic perspective view of a bathroom lighting device according to an embodiment of the present invention. It is a disassembled perspective view of the illuminating device which concerns on one Embodiment of this invention. It is sectional drawing of the illuminating device which concerns on one Embodiment of this invention. It is an enlarged view of the P section of FIG. It is a flowchart which shows the flow of the process by a control circuit.

  Hereinafter, a bathroom lighting device according to an embodiment of the present invention will be described with reference to the drawings.

  First, FIG. 1 is a schematic perspective view of a bathroom lighting device 10 according to an embodiment of the present invention. The bathroom lighting device 10 is typically a bathroom ventilation fan-integrated lighting device installed on the ceiling of the bathroom, and is adjacent to the louver 20 for exhausting the air in the bathroom and the louver 20 (in this example, the center). And a lighting device 100 that illuminates the interior of the bathroom. The louver 20 is configured by combining a plurality of long plate-like members called wing plates, and air in the bathroom is discharged to the air duct 30 through a gap between adjacent wing plates.

  In addition, an air duct 30 and a ventilation fan 40 are provided on the back surface of the bathroom lighting device 10 (that is, the ceiling). That is, by rotating the ventilation fan 40, the air in the bathroom is exhausted to the outside through the louver 20 and the air duct 30.

  Next, with reference to FIGS. 2-4, the illuminating device 100 which concerns on one Embodiment of this invention is demonstrated. 2 is an exploded perspective view of the lighting device 100, FIG. 3 is a cross-sectional view of the lighting device 100, and FIG. 4 is an enlarged view of a portion P in FIG.

  The lighting device 100 includes an LED module 110, a first housing 120, a second housing 130, a translucent plate 140, a control circuit 150, a fan 160, a heat sink 170, a heat sink 180, and a heat pipe. 190 and a lid 200 are mainly provided.

  The LED module 110 is a light source composed of a semiconductor light emitting element, and is a light emitting module (light emitting unit) that emits predetermined light. The LED module 110 includes a rectangular ceramic substrate 111, a plurality of LED chips 112 mounted in a matrix on one surface of the ceramic substrate 111, and a sealing resin (not shown) for sealing the LED chips 112. It is constituted by. Predetermined phosphor particles are dispersed in the sealing resin, and light output from the LED chip 112 is converted into a desired color by the phosphor particles.

  In the present embodiment, a blue LED that emits blue light is used for the LED chip 112. More specifically, a gallium nitride based semiconductor light emitting element that is made of an InGaN based material and has a central wavelength of 440 nm to 470 nm can be used. However, the semiconductor light emitting element is not limited to the above example, and other semiconductor light emitting elements such as a semiconductor laser and an organic EL (Electro Luminescence) may be used.

  In this embodiment, yellow phosphor particles are used as the phosphor particles. More specifically, a YAG (yttrium / aluminum / garnet) phosphor material or a phosphor-containing resin in which yellow phosphor fine particles are dispersed in a silicone resin can be used. Accordingly, the yellow phosphor is excited by the blue light emitted from the blue LED and emits yellow light. As a result, white light is emitted from the LED module 110 by the yellow light and the blue light of the blue LED.

  When the first housing 120 is installed, an opening 121 is formed in a surface positioned vertically below, and the opening 121 is closed by the light transmitting plate 140 so that the first space is formed inside. Is formed. In the first space formed by the first housing 120 and the translucent plate 140, the LED module 110 and the heat radiating plate 180 are arranged. Specifically, a heat sink 180 is installed on the surface facing the opening 121, and the LED module 110 is attached to the heat sink 180. Further, the inner wall surface of the first housing 120 serves as a reflection surface that reflects the light output from the LED module 110 and guides it to the translucent plate 140.

  Although the material which comprises this 1st housing 120 is not specifically limited, For example, the insulation of the illuminating device 100 is securable by forming with resin. In addition, the second housing 130 and the lid 200 can be formed of the same material as that of the first housing 120.

  When the second housing 130 is installed, an opening 131 is formed on a surface positioned vertically below, and the opening 131 is closed with a lid 200, whereby a second space is formed inside. The A control circuit 150 and a heat sink 170 are arranged in the second space formed by the second housing and the lid 200.

  Furthermore, a through hole 134 is formed in the wall surface of the second housing 130 (in this example, the wall surface facing the opening 131). And the fan 160 is attached to this through-hole 134, and the heat sink 170 is installed in the position which faces the fan 160 in 2nd space.

  The first and second housings 120 and 130 constitute a housing. Further, the first and second housings 120 and 130, the translucent plate 140, and the lid 200 constitute a housing. Then, the wall surfaces 122 and 132 in contact with the mating sides of the first and second housings 120 and 130 (that is, the wall surface 122 of the first housing 120 in contact with the second housing 130 and the first wall 120 in contact with the first housing 120). 2 indicates a wall surface 132 of the housing 130.) functions as a partition that partitions the internal space of the housing into a first space and a second space. The partition wall is formed with communication holes 123 and 133 that allow the first and second spaces to communicate with each other.

  However, this partition is not an essential component and can be omitted. That is, the LED module 110, the control circuit 150, the fan 160, etc. may be arranged in the internal space of one housing. However, as shown in FIG. 3, by arranging the LED module 110 in the first space and the control circuit 150 in the second space, the influence of heat generated from the LED module 110 is directly controlled by the control circuit. 150 can be prevented, so that a failure of the control circuit 150 can be effectively prevented.

  The translucent plate 140 is a flat plate member that transmits light output from the LED module 110 into the bathroom. The surface of the light transmitting plate 140 facing the LED module 110 (the lower surface in FIG. 2) is a coating surface coated with a film that diffuses light output from the LED module 110.

  Although the material which comprises this translucent board 140 is not specifically limited, For example, an acrylic resin is employable. The coating film can be formed by coating a solution containing powder such as silica or calcium carbonate on the surface of the translucent plate 140, for example.

  The control circuit (control unit) 150 includes a lighting circuit that lights the LED module 110 and a drive circuit that drives the fan 160. The control circuit 150 that functions as a lighting circuit includes a rectifier circuit that converts an alternating current supplied from an alternating current power supply (not shown) into a direct current, and an instruction from the user, and receives the direct current converted by the rectifier circuit using an LED. And a switch for switching whether to supply the module 110 (that is, turning on or off the LED module 110). Specifically, the rectifier circuit is configured by a diode bridge using four Zener diodes. On the other hand, the control circuit 150 that functions as a drive circuit controls the drive of the fan 160 according to the lighting state of the LED module 110. Details of the control will be described later.

  The fan (intake / exhaust unit) 160 is attached to a through hole 134 formed in the wall surface of the second housing 130, and performs intake / exhaust between the internal space and the external space of the housing according to the control of the control circuit 150. . Specifically, air is sucked (intake) from the external space into the internal space while the LED module 110 is turned on, and air is discharged (exhaust) from the internal space to the external space while the LED module 110 is turned off.

  Note that the air sucked into the interior space of the lighting device 100 by the fan 160 is mainly air exhausted from the bathroom through the louver 20 and contains a large amount of water vapor. Therefore, the fan 160 preferably includes a moisture absorption unit such as a water removal filter that removes water vapor contained in the intake air.

  In the present embodiment, the fan 160 has been described as an example of the intake / exhaust unit. However, any unit that can perform intake / exhaust between the internal space and the external space of the lighting device 100 may be used. Good.

  For example, as shown in FIG. 4, the heat sink 170 includes a plurality of fins attached to a heat pipe 190. The heat sink 170 is disposed in the second housing 130 (in the second space) and at a position facing the fan 160. Thereby, the heat of the heat sink 170 is efficiently radiated by the convection generated by the rotation of the fan 160.

  For example, as shown in FIG. 3, the heat sink 180 is a plate-like member, holds the LED module 110, and is disposed in the first housing 120 (in the first space). For example, as shown in FIG. 4, the heat pipe 190 is a rod-shaped member having a cavity 191 therein. The cavity 191 may be filled with gas or liquid having high thermal conductivity. The heat pipe 190 passes through the partition wall and connects the heat sink 170 and the heat sink 180. That is, the heat dissipation plate 180 and the heat pipe 190 function as a heat transfer unit that transfers heat generated by the LED module 110 to the heat sink (heat dissipation unit) 170.

  When the LED module 110 is turned on, the heat sink 180 in contact with the LED module 110 becomes relatively high temperature, and the heat sink 170 cooled by the fan 160 becomes relatively low temperature. That is, since a temperature gradient is generated between the heat sink 180 and the heat sink 170, the heat generated by the LED module 110 does not stay in the first space but is efficiently radiated through the heat sink 180, the heat pipe 190, and the heat sink 170. The

  In addition, although the material which comprises the heat sink 170, the heat sink 180, and the heat pipe 190 is not specifically limited, For example, it is comprised with metal materials with high heat conductivity, such as an aluminum alloy, or heat conductive resin.

  Next, a specific example of control of the fan 160 by the control circuit 150 will be described with reference to FIG. FIG. 5 is a flowchart showing the flow of processing by the control circuit 150. First, the control circuit 150 determines whether the LED module 110 is turned on or turned off when an operation by the user is received (S11).

  Here, when the LED module 110 is in a lighting state, the internal space of the lighting device 100 is heated to a higher temperature than the external space due to heat generated from the LED module 110. Therefore, when it is determined that the LED module 110 has been turned on (Yes in S11), the control circuit 150 rotates the fan 160 in one direction (S12). The rotation direction of the fan 160 at this time is a direction in which air is sucked into the internal space from the external space of the lighting device 100.

  Thereby, the inside of the lighting device 100 is cooled by the outside air sucked through the fan 160. Here, the outside air contains a large amount of water vapor. However, since the inside of the lighting device 100 is hot, the water vapor does not become water droplets and adhere to the inside of the lighting device 100.

  The control circuit 150 supplies a current (first current) to a motor that drives the fan 160 in order to rotate the fan 160 in one direction. This supply of current is continued until the LED module 110 is turned off.

  On the other hand, when the LED module 110 is turned off, the temperature inside the lighting device 100 gradually decreases. If it does so, there exists a possibility that water vapor | steam may turn into a water droplet and may adhere to the inside of the illuminating device 100. Therefore, when it is determined that the LED module 110 is turned off (No in S11), the control circuit 150 rotates the fan 160 in the other direction (S13). The rotation direction of the fan 160 at this time is the direction in which the air is exhausted from the internal space of the lighting device 100 to the external space, that is, the reverse direction to that in step S12.

  As a result, air containing a large amount of water vapor can be discharged through the fan 160, so that the control circuit 150 is short-circuited or the coating on the coating surface of the translucent plate 140 is peeled off by water droplets generated as the temperature decreases. Can be effectively prevented.

  The control circuit 150 supplies a current (second current) in a direction opposite to the first current to the motor that drives the fan 160 in order to rotate the fan 160 in the other direction. This current supply stops when a predetermined condition is satisfied. The predetermined condition may be, for example, that a predetermined time has elapsed, or that the temperature difference between the internal space and the external space of the lighting device 100 has become a predetermined value or less. Good.

  In step S13 of FIG. 5, the example in which the air inside the lighting device 100 is forcibly exhausted by rotating the fan 160 in the other direction has been described. However, the present invention is not limited to this, and natural exhaust is performed using a temperature gradient. You may let them.

  Specifically, a temperature gradient of the temperature of the first space> the temperature of the second space> the temperature of the external space is generated around the lighting device 100. Therefore, when it is determined that the LED module 110 is turned off (No in S11), the control circuit 150 stops supplying the driving force (ie, power) to the fan 160. Thereby, the air inside the lighting device 100 moves from the first space to the second space through the communication holes 123 and 133 and is discharged to the external space through the through hole 134 in which the fan 160 is installed.

  As described above, when the LED module 110 is turned on, low-temperature air is sucked and cooled, and when the LED module 110 is turned off, high-humidity air is discharged to suppress the formation of condensation, thereby ensuring high heat dissipation performance. In addition, the lighting device 100 having a long electrical and optical life can be obtained.

  In addition, in order to perform intake / exhaust through the fan 160, in addition to the through-hole 134 in which the fan 160 is installed, a through-hole that connects the internal space of the lighting device 100 and the external space is required. As an example of the through-hole, for example, a gap at a contact portion between the first housing 120 and the translucent plate 140 can be used. Usually, since the first housing 120 and the light transmitting plate 140 are only in contact with each other, there is a minute gap between them. Therefore, if this gap is used as the above-described through hole, the above-described effect can be obtained without positively forming the through hole elsewhere.

  However, it is desirable to seal the contact portion (gap between the two members) between the first housing 120 and the translucent plate 140 with a sealing member. Thereby, for example, even if shower splashes reach the lighting device 100, it is possible to effectively prevent water droplets from entering the internal space. In this case, it is necessary to separately provide through holes in the wall surfaces of the first and second housings 120 and 130. The position of the through hole is not particularly limited, but it is desirable to provide a through hole on the wall surface of the first housing 120 opposite to the second housing 130 in order to cause convection throughout the entire interior of the lighting device 100. .

  Moreover, although the illuminating device 100 which concerns on said embodiment showed the example used for the bathroom illuminating device 10, it is not restricted to this, An advantageous effect is used when used in other uses, especially a high humidity environment. Play.

  As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to the thing of embodiment shown in figure. Various modifications and variations can be made to the illustrated embodiment within the same range or equivalent range as the present invention.

  The present invention is advantageously used for a lighting device used in a particularly humid environment.

DESCRIPTION OF SYMBOLS 10 Bathroom lighting device 20 Louver 30 Air duct 40 Ventilation fan 100 Lighting device 110 LED module 111 Ceramic substrate 112 LED chip 120 1st housing 121,131 Opening 122,132 Wall surface 123,133 Communication hole 130 2nd housing 134 Through-hole 140 Translucent plate 150 Control circuit 160 Fan 170 Heat sink 180 Heat sink 190 Heat pipe 191 Cavity 200 Lid

Claims (10)

A light emitting module;
A housing for holding the light emitting module in an internal space;
An intake / exhaust section for performing intake / exhaust between the internal space and the external space of the housing;
And a control unit that controls the intake / exhaust unit so that air is sucked into the internal space from the external space while the light emitting module is turned on and exhausted from the internal space to the external space while the light emitting module is turned off. The intake / exhaust part is a fan,
The controller is
While the light emitting module is lit, rotate the fan in one direction to inhale,
The lighting device according to claim 1, wherein the fan is forcedly exhausted by rotating the fan in the other direction while the light emitting module is turned off. The intake / exhaust part is a fan,
The controller is
While the light emitting module is lit, rotate the fan in one direction to inhale,
The lighting device according to claim 1, wherein the fan is stopped while the light emitting module is turned off, and is naturally exhausted using a temperature gradient between the internal space and the external space. The lighting device according to claim 1, wherein the intake / exhaust unit further includes a moisture absorption unit that removes water vapor contained in the intake air. The housing includes a partition that partitions an internal space into a first space and a second space,
The partition wall is formed with a communication hole for communicating the first and second spaces.
The light emitting module is disposed in the first space,
The lighting device according to claim 1, wherein the intake / exhaust unit and the control unit are arranged in a second space. The lighting device further includes:
A heat dissipating part disposed in the second space and dissipating heat;
A heat transfer part disposed in the first space and transferring heat generated by the light emitting module to the heat dissipation part;
The lighting device according to claim 5, wherein the intake / exhaust portion is disposed at a position facing the heat radiating portion. The housing is
A housing having an opening and holding the light emitting module therein;
The illuminating device according to claim 1, further comprising: a translucent plate that is attached to the opening of the housing and transmits light output from the light emitting module. The lighting device according to claim 7, wherein a contact portion between the housing and the translucent plate is sealed with a sealing member. The lighting device according to claim 1, wherein the control unit further receives an instruction from a user and turns on or off the light emitting module. A bathroom lighting device installed on the ceiling of the bathroom,
The lighting device according to any one of claims 1 to 9,
A bathroom lighting device comprising: a louver installed adjacent to the lighting device and exhausting air in the bathroom.

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