JP4650681B2 - Lighting device and image display device - Google Patents

Description

  The present invention relates to the technical field of lighting devices and image display devices. More specifically, the present invention relates to a technical field for improving cooling efficiency without circulating dust and the like by circulating cooling air in a sealed space.

  For example, there is an illuminating device that performs illumination using a plurality of light sources such as light emitting diodes. For example, the illumination device is used as an illumination device using a light source as direct illumination, or used in an image display device such as a television receiver using the light source as backlight illumination.

  Such an illuminating device is generally provided with a cooling mechanism because there is a problem that the light emission efficiency of the light source is reduced due to heat generated by the light emission of the light source (see, for example, Patent Document 1).

  The cooling mechanism described in Patent Document 1 forms a ventilation hole in a casing in which a light source is arranged, forms a ventilation hole in a ventilation member arranged adjacent to the casing, and The flowing cooling air is taken into the casing through the ventilation hole of the ventilation member and the ventilation hole of the casing to cool the light source. A ventilation hole is formed in the outer casing in which the casing and the ventilation member are arranged to take in the air existing outside the outer casing as cooling air, and the ventilation is performed through the ventilation hole of the outer casing and the ventilation hole of the ventilation member. Cooling air is taken into the member from outside.

Japanese Patent Laid-Open No. 10-96898

  However, in the cooling mechanism described in Patent Document 1, the cooling air flowing inside the ventilation member is taken into the casing through the ventilation hole of the ventilation member and the ventilation hole of the casing. There is a problem that dust or the like existing inside the ventilation member enters the inside of the casing, and the intruding dust or the like adheres to a light source or the like disposed inside the casing and causes a decrease in the amount of light. .

  In addition, since the air present outside the outer casing is taken in as cooling air in the ventilation member, the intrusion of dust into the casing is further increased.

  In order to prevent dust from entering the housing, it may be possible to attach a filter to the ventilation hole. However, in order to prevent the filter from being clogged with dust, it is necessary to periodically clean the filter. It will take.

  Therefore, an object of the illumination device and the image display device of the present invention is to overcome the above-described problems and to improve the cooling efficiency without causing intrusion of dust or the like.

In order to solve the above-described problem, the illumination device of the present invention is provided with a housing having an arrangement surface portion on which a plurality of light sources are arranged, and a blowing unit that sends cooling air that suppresses a temperature rise of the light sources. Forming an air flow passage communicating with the internal space of the housing on the opposite side of the surface on which the light source is disposed across the surface portion, forming a sealed space isolated from the outside by the internal space of the housing and the air flow passage; Cooling air is sent and circulated in a predetermined direction in the sealed space by the air blowing means, a duct having the air flow passage formed therein is attached to the housing, and heat is absorbed from the cooling air flowing through the air flow passage. The exhaust heat fin that releases the heat absorbed together to the outside of the sealed space is provided, and a part of the exhaust heat fin is arranged inside the duct, and the heat absorbed from the cooling air is absorbed inside the duct. Conducted to exhaust heat fin Place the heat conducting means, mounting the discharge fan for discharging the heat emitted from the exhaust heat fins in the heat fins to the outside of the closed space, to the placement surface from the outer peripheral edge of the placement surface in the housing Side surfaces projecting in a direction substantially orthogonal to each other, and heat radiating fins for releasing heat generated by light emission of the light source are provided on at least a part of the side surfaces .

In order to solve the above-described problems, the image display device of the present invention is provided with a blowing unit that sends cooling air that suppresses the temperature rise of the light source, and on the side opposite to the surface on which the light source is disposed across the arrangement surface portion of the housing. An air flow passage that communicates with the internal space of the housing is formed, a sealed space that is isolated from the outside is formed by the internal space of the housing and the air flow passage, and cooling air is directed in a predetermined direction within the sealed space by the blowing means. Exhaust heat that allows the air to be circulated, has a duct with the air flow path formed inside it, and absorbs heat from the cooling air flowing through the air flow path and releases the absorbed heat to the outside of the sealed space A fin is provided, a part of the exhaust heat fin is disposed in the duct, heat conduction means for absorbing heat from the cooling air and conducting the absorbed heat to the exhaust heat fin is disposed in the duct , The exhaust heat fin A discharge fan that discharges heat released from the fins to the outside of the sealed space is attached, and the casing is formed of a material having thermal conductivity, and the casing is substantially orthogonal to the arrangement plane from the periphery of the arrangement plane. A holding frame that holds the image display unit is attached to the housing, and a holding frame that holds the image display unit is attached to the housing. A heat dissipating fin for releasing the generated heat is provided .

Therefore, in the illumination device and the image display device of the present invention, the light source is cooled in a state where the intrusion of the cooling air from the outside is blocked. That is, when the cooling air flows in the duct, the heat conducting means absorbs the heat from the cooling air that has absorbed heat from the light source, and the absorbed heat is conducted to the exhaust heat fin. At this time, the heat absorbed directly into the exhaust heat fin is also conducted from the cooling air that has absorbed heat from the light source. From the heat exhaust fin, the heat conducted from the heat conducting means or the cooling air is released to the outside and heat exchange is performed. And the heat discharge | release performance to the exterior of a heat exhaust fin improves by attaching a fan for discharge to a heat exhaust fin. Further, by providing the radiation fins on the outer surface of the casing, heat that can be accumulated in each part of the casing can be released from the radiation fins.

The illuminating device of the present invention includes a housing having a placement surface portion on which a plurality of light sources are placed, and a blowing unit that sends cooling air that suppresses the temperature rise of the light source, and the light source is placed across the placement surface portion of the housing. An air flow passage that communicates with the internal space of the housing is formed on the opposite side of the surface, a sealed space that is isolated from the outside by the internal space of the housing and the air flow passage is formed, and cooling air is blown into the sealed space by the blowing means The air flow passage is formed in the inside of the casing, and the duct is formed to absorb the heat from the cooling air flowing through the air flow passage and absorb the absorbed heat outside the sealed space. A heat conduction means for disposing heat exhaust fins to be discharged into the duct, disposing a part of the exhaust heat fins in the duct, and absorbing heat from the cooling air in the duct and conducting the absorbed heat to the heat exhaust fins It was placed, the waste heat An exhaust fan for exhausting the heat released from the exhaust heat fin to the outside of the sealed space is attached to the fin, and the housing is protruded from the outer peripheral edge of the arrangement surface portion in a direction substantially orthogonal to the arrangement surface portion. A side surface portion is provided, and at least a part of the side surface portion is provided with a heat radiating fin for releasing heat generated by light emission of the light source .

Accordingly, there is no possibility that dust or the like enters from the outside into the sealed space, and it is possible to improve the cooling efficiency and prevent the occurrence of problems such as a decrease in the amount of light in the light source. That is, when the cooling air flows in the duct, the heat conducting means absorbs the heat from the cooling air that has absorbed heat from the light source, and the absorbed heat is conducted to the exhaust heat fin. At this time, the heat absorbed directly into the exhaust heat fin is also conducted from the cooling air that has absorbed heat from the light source. From the heat exhaust fin, the heat conducted from the heat conducting means or the cooling air is released to the outside and heat exchange is performed. And the heat discharge | release performance to the exterior of a heat exhaust fin improves by attaching a fan for discharge to a heat exhaust fin. Further, by providing the radiation fins on the outer surface of the casing, heat that can be accumulated in each part of the casing can be released from the radiation fins.

The image display device of the present invention is an image display device in which an image display unit that displays an image is attached to a housing having a placement surface portion, and a plurality of light sources that function as a backlight of the image display portion are placed on the placement surface portion of the housing. The air flow passage communicating with the internal space of the housing is formed on the opposite side of the surface on which the light source is disposed across the placement surface portion of the housing with the blowing means for sending the cooling air to suppress the temperature rise of the light source. A sealed space that is isolated from the outside by the internal space of the housing and the air flow passage is formed, and the cooling air is circulated in a predetermined direction in the sealed space by the air blowing means, and the air flow passage is provided inside. A duct formed with a heat sink is attached to the housing, and heat exhaust fins that absorb heat from the cooling air flowing through the air flow passage and release the absorbed heat to the outside of the sealed space are provided, and the exhaust heat fins are disposed inside the duct. One Were placed, to place the heat conducting means for conducting the exhaust heat fins absorbed heat while absorbing heat in the interior of the duct from the cooling air, the closed space of heat emitted from the exhaust heat fins in the heat fins A discharge fan for discharging to the outside is attached, the casing is formed of a material having thermal conductivity, and a side surface portion that protrudes in a direction substantially orthogonal to the arrangement surface portion from the periphery of the arrangement surface portion is formed on the case. Provided, a holding frame for holding the image display unit is provided, a holding frame for holding the image display unit is attached to the housing, and a heat radiating fin for releasing heat generated by light emission of the light source is provided on at least a part of the side surface of the housing. It is characterized by that.

Accordingly, there is no possibility that dust or the like enters from the outside into the sealed space, and it is possible to improve the cooling efficiency and prevent the occurrence of problems such as a decrease in the amount of light in the light source. That is, when the cooling air flows in the duct, the heat conducting means absorbs the heat from the cooling air that has absorbed heat from the light source, and the absorbed heat is conducted to the exhaust heat fin. At this time, the heat absorbed directly into the exhaust heat fin is also conducted from the cooling air that has absorbed heat from the light source. From the heat exhaust fin, the heat conducted from the heat conducting means or the cooling air is released to the outside and heat exchange is performed. And the heat discharge | release performance to the exterior of a heat exhaust fin improves by attaching a fan for discharge to a heat exhaust fin. Further, by providing the radiation fins on the outer surface of the casing, heat that can be accumulated in each part of the casing can be released from the radiation fins.

  The best mode of the illumination device and the image display device of the present invention will be described below with reference to the accompanying drawings.

  In the best mode shown below, the image display device of the present invention is applied to a television receiver that displays an image on a liquid crystal panel, and the illumination device of the present invention is installed in the back of the television receiver. This is applied to a light illumination device.

  The scope of application of the present invention is not limited to a television receiver having a liquid crystal panel and a backlight illuminating device provided therein, and other various television receivers and image display devices used in personal computers. Etc. and various illumination devices used for these.

  The image display device (television receiver) 1 is configured by arranging required parts inside an outer casing 2 (see FIG. 1).

  The outer casing 2 is formed in a box shape that is opened forward and backward flat, and an image display unit 3 that displays an image is disposed at a position that closes the opening from the inside. The image display unit 3 is configured, for example, by sandwiching a transmissive color liquid crystal panel between two polarizing plates from the front and the back, and displays a full-color image by being driven by an active matrix system.

  A lighting device 4 is arranged inside the outer casing 2 (see FIG. 2). The illuminating device 4 is configured by arranging necessary parts in a housing 5.

  The housing 5 is formed in a box shape that is open forward and backward flat, and protrudes forward from the arrangement surface portion 6 facing in the front-rear direction and the outer peripheral edge of the arrangement surface portion 6 as shown in FIGS. 2 and 3. The upper side surface portion 7, the lower side surface portion 8, the left side surface portion 9, and the right side surface portion 10.

  An optical function sheet 11 and a diffusion plate 12 are attached to the front end of the housing 5 (see FIG. 2).

  The optical function sheet 11 is, for example, a predetermined sheet such as a diffusion sheet that diffuses light emitted from a light source (light emitting diode) described later, a prism sheet that refracts light to guide the light in a predetermined direction, or a polarization conversion sheet that converts the polarization direction. Various sheets having the optical function are laminated in a layered manner.

  The optical function sheet 11 is attached to the front surface of the diffusion plate 12, and the diffusion plate 12 is disposed so as to face the light source. The diffusing plate 12 has a function of diffusing light emitted from the light source inside the housing 5 to achieve uniform luminance in surface light emission.

  On the front surface 6a of the arrangement surface portion 6 of the housing 5, for example, light source units 13, 13,... Are arranged at equal intervals on the left and right sides (see FIGS. 1 to 3). The light source unit 13 is formed by arranging a plurality of light sources 13b, 13b,... As the light sources 13b, 13b,..., For example, a red light emitting diode that emits red light, a green light emitting diode that emits green light, and a blue light emitting diode that emits blue light are used. These light sources 13b, 13b,... Are used as backlights when displaying images in the image display unit 3.

  In the above, an example in which the vertically long light source units 13, 13,... Having the light sources 13b, 13b,. The arrangement of the light sources 13b, 13b,... Is not limited to such an arrangement, and the arrangement of the light sources may be any arrangement as long as it effectively functions as a backlight. . For example, the arrangement may be such that the light sources are regularly scattered.

  A holding frame 14 is attached to the front surface of the housing 5 (see FIG. 2). The display frame 3 is held at the front end of the holding frame 14.

  As shown in FIG. 2 to FIG. 5, upper communication holes 5 a, 5 a,... .. 5b, 5b,... The upper communication holes 5a, 5a, ... and the lower communication holes 5b, 5b, ... are located between the light source units 13, 13, ..., respectively.

  Fans 15, 15,... Are attached to the upper end portion of the front surface 6a of the arrangement surface portion 6 of the housing 5 with the upper communication holes 5a, 5a,. FIG. 3 and FIG. 5). The fans 15, 15,... Are configured to take cooling air from an air intake port formed on the rear surface and blow the cooling air downward from an air outlet port formed on the lower surface, for example, It functions as a blowing means that sends air in a predetermined direction.

  Ducts 16, 16,... Are attached to the rear surface 6b of the arrangement surface portion 6 of the housing 5 at regular intervals on the left and right sides (see FIGS. 2, 4, and 5). The duct 16 is formed in a vertically long box shape opened forward, and is attached to a position where the upper communication hole 5a and the lower communication hole 5b are closed from the rear.

  Exhaust heat fins 17, 17,... Are attached to the rear surface 6b of the arrangement surface portion 6 of the housing 5 at equal intervals on the left and right sides (see FIGS. 2, 4, and 5). As shown in FIG. 6, the exhaust heat fin 17 includes an attached surface portion 17 a and exhaust heat portions 17 b, 17 b,... Projecting rearward from the attached surface portion 17 a, and the exhaust heat portions 17 b, 17 b. Are provided at regular intervals on the left and right. The heat exhaust portions 17b, 17b,... Are formed in a plate shape that faces in the left-right direction.

  The exhaust heat fin 17 has a mounting surface portion 17a attached to the arrangement surface portion 6, and the exhaust heat portions 17b, 17b,... The tip side portions of the exhaust heat portions 17b, 17b,... Pass through the slits formed in the duct 16 and protrude to the rear of the duct 16.

  The exhaust heat fin 17 has left and right ends of the mounting surface portion 17a projecting sideways from the notches 16a and 16a of the duct 16, respectively, and a seal is provided in the gap between the notches 16a and 16a and the mounting surface portion 17a. The material is filled. In addition, the exhaust heat fins 17 have rear heat exhaust portions 17b, 17b,... That protrude rearward from the slits of the duct 16, and the slits and exhaust heat portions 17b, 17b,. The gap is also filled with a sealing material. Therefore, the inside of the duct 16 is a space isolated from the outside, and this space serves as the air flow passage 16b.

  In the ducts 16, 16,..., Heat conduction means 18, 18,. The heat conducting means 18 plays a role of conducting heat from the air flowing in the duct 16 to the exhaust heat fins 17. For example, metal wool such as steel wool or stainless wool is used as the heat conducting means 18, but various kinds of materials can be used as long as they do not easily resist air flow in the duct 16 and have high heat conductivity. It is possible.

  The internal space of the housing 5 and the air flow passages 16b, 16b, ... of the ducts 16, 16, ... are the upper communication holes 5a, 5a, ... and the lower communication holes 5b, 5b, ... The closed space 19 is formed by the internal space of the housing 5 and the air flow passages 16b, 16b,... (See FIG. 5).

  A circuit board 20 is disposed inside the outer casing 2 behind the casing 5 (see FIG. 2). The circuit board 20 is formed with necessary circuits such as a drive circuit for the image display unit 3, a drive circuit for the light source units 13, 13,..., A drive circuit for the fans 15, 15,.

  .. Are provided on the outer peripheral surface of the housing 5 (see FIGS. 2 to 4). The radiating fins 21, 21,... Are, for example, at the left and right end portions of the upper side surface portion 7 and the lower side surface portion 8, and the upper and lower end portions of the left side surface portion 9 and the right side surface portion 10. It is provided at the corresponding position.

  In the image display device 1 configured as described above, when an image is displayed on the image display unit 3, the light source units 13, 13,... Are driven as backlights, and the light sources 13b, 13b,. Emits light. Heat is generated with the light emission of the light sources 13b, 13b,.

  When the light sources 13b, 13b,... Emit light, the fans 15, 15,... Are rotated, and cooling air is blown downward from the air outlets of the fans 15, 15,. The cooling air flows into the ducts 16, 16,... From the lower communication holes 5b, 5b,... Formed in the casing 5, and flows upward in the ducts 16, 16,. Then, the fluid flows again into the housing 5 from the upper communication holes 5a, 5a,. The cooling air flowing into the housing 5 is taken into the fans 15, 15,... From the air intake ports of the fans 15, 15,. It is blown out downward again.

  As described above, in the image display device 1, the cooling air circulates in the sealed space 19 formed by the internal space of the housing 5 and the air flow passages 16b, 16b,... Of the ducts 16, 16,. , And the temperature rise of the light sources 13b, 13b,... Due to the heat generated with the light emission of the light sources 13b, 13b,.

  When the cooling air flows in the ducts 16, 16,..., The heat conducting means 18, 18,... Absorb the heat from the cooling air that has absorbed heat from the light sources 13b, 13b,. The absorbed heat is conducted to the exhaust heat fins 17, 17,. At this time, the heat absorbed in the exhaust heat fins 17, 17,... Is also conducted directly from the cooling air that has absorbed heat from the light sources 13b, 13b,. From the exhaust heat portions 17b, 17b,... Of the exhaust heat fins 17, 17,..., Heat conducted from the heat conducting means 18, 18,. Done.

  As described above, in the image display device 1, the sealed space isolated from the outside by the internal space of the housing 5 and the air flow passages 16b, 16b,... Of the ducts 16, 16,. 19 is formed, and the cooling air is sent in a predetermined direction in the sealed space 19 to be circulated by the fans 15, 15,.

  Therefore, there is no possibility of dust or the like from entering the sealed space 19 from the outside, the cooling efficiency can be improved, and the occurrence of problems such as a decrease in the amount of light in the light sources 13b, 13b,. it can.

  Moreover, since the temperature rise in the housing | casing 5 is suppressed by cooling air, the improvement of the light emission efficiency of light source 13b, 13b, ... and the uniform temperature distribution between each light source 13b, 13b, ... are achieved. Therefore, it is possible to prevent the occurrence of problems such as unevenness in luminance and change in color tone due to changes in wavelength.

  Further, there are provided heat exhaust fins 17, 17,... For releasing heat absorbed from the cooling air flowing through the air flow passages 16b, 16b, ... of the ducts 16, 16, ... to the outside of the sealed space 19. Therefore, heat exchange between the sealed space 19 and the outside is performed, and the cooling efficiency can be further improved. It should be noted that by increasing the amount of protrusion of the exhaust heat fins 17, 17,... From the attached surface portion 17 a, the heat radiation area can be increased and the cooling efficiency can be improved. Although it is possible to increase the amount of protrusion of the heat exhausting portions 17b, 17b,... From the attached surface portion 17a, the thinning of the image display device 1 is hindered, so the heat exhausting portions 17b, 17b, It is desirable to determine the amount of protrusion from the mounted surface portion 17a in consideration of both cooling efficiency and thinning.

  In addition, since heat conduction means 18, 18,... That conduct heat to the exhaust heat fins 17, 17,... Are arranged inside the ducts 16, 16,. The heat conductivity to the exhaust heat fins 17, 17,... Can be improved, and the cooling efficiency can be improved.

  When heat is generated by the light emission of the light sources 13b, 13b,..., The generated heat is mainly absorbed by the cooling air circulating in the sealed space 19, but part of the heat is generated in the housing. 5 or may be transmitted from the housing 5 to the image display unit 3 via the holding frame 14.

  As described above, the image display device 1 is provided with the heat radiation fins 21, 21,... On the outer surface of the housing 5, so that heat that can be accumulated in each part of the housing 5 and the image display unit 3. The heat that can be transferred to the radiating fins 21, 21,.

  Therefore, the temperature rise of the light sources 13b, 13b,... Can be further suppressed to prevent the characteristics of the light sources 13b, 13b,. The transmission of heat to the display unit 3 is suppressed, and the occurrence of problems such as display unevenness due to the characteristic change of the image display unit 3 can be prevented.

  Further, each corner of the housing 5 is a portion where the arrangement surface portion 6, the upper side surface portion 7 or the lower side surface portion 8, and the left side surface portion 9 or the right side surface portion 10 are coupled, and the light sources 13b, 13b,. Although the heat generated sometimes is transmitted and the temperature is likely to rise, as described above, the cooling efficiency is improved by providing the radiation fins 21, 21,... At each corner of the housing 5. Can do.

  In addition, although the example which provided the radiation fins 21, 21, ... in each corner of the housing | casing 5 was shown above, the position which provides the radiation fins 21, 21, ... is each corner of the housing | casing 5. The upper side surface portion 7, the lower side surface portion 8, the left side surface portion 9 and the right side surface portion 10 of the housing 5 may be provided, for example, and may be provided on the upper side where a large amount of heat transfer is assumed. You may make it provide only in two corners.

  Moreover, in order to improve cooling efficiency, you may provide ventilation means, such as a fan which blows cooling air to the radiation fins 21, 21, ....

Further, as shown in FIG. 7, the discharge fans 22, 22,... Are respectively attached to the tips of the heat exhaust portions 17 b, 17 b ,. As a result, the heat release performance to the outside of the exhaust heat fins 17, 17,... Can be improved, and the cooling efficiency can be improved.

  In the above, an example in which the fans 15, 15,... Are arranged on the front surface 6 a of the arrangement surface portion 6 of the housing 5 is shown. The fan 15, 15,... Can be arbitrarily positioned as long as the cooling air is circulated in the sealed space 19 and does not hinder the image display on the image display unit 3. It is possible to arrange at a position, for example, it is possible to attach to the rear surface 6b of the arrangement surface portion 6 and the inner surfaces of the ducts 16, 16,.

  Further, the circulation path of the cooling air is not limited to the above-described example. For example, the air flow passages 16b, 16b of the ducts 16, 16,... It may be configured to flow and circulate from above to below.

  Further, it is possible to set the circulation route as shown below (see FIGS. 8 to 10).

  For example, as shown in FIG. 8, the fans 15, 15,... Are divided into an upper end portion and a lower end portion of the housing 5, and the cooling air is sent to the fans 15, 15,. A distinction is made between the fans 15, 15,... That send air downward.

  By arranging the fans 15, 15,... In this state, the cooling air flows upward or downward in the housing 5 and circulates.

  Further, for example, as shown in FIG. 9, the ducts 16, 16,... Are attached to the upper end portion and the lower end portion of the rear surface 6 b of the arrangement surface portion 6 so as to be laterally separated from each other in the horizontal direction, and the fans 15, 15, Are arranged at positions corresponding to the left and right ends of the ducts 16, 16,.

  In this way, by arranging the fans 15, 15,... And the ducts 16, 16,..., The cooling air flows in the left-right direction in the ducts 16, 16,. Cooling air is circulated by flowing upward or downward.

  Further, for example, as shown in FIG. 10, the fans 15, 15,... Are arranged at positions directly above or directly below the light source units 13, 13,.

  By arranging the fans 15, 15,... At such positions, the cooling air is circulated by flowing downward or upward on the substrates 13a, 13a,... Of the light source units 13, 13,. Is done. As the cooling air flows over the substrates 13a, 13a,..., The efficiency of absorbing heat from the light sources 13a, 13a,... Of the cooling air is improved, and the cooling efficiency can be improved.

  In the above, the example in which the direction in which the cooling air flows is from the lower side to the upper side or the upper side to the lower side is shown. Is possible.

  The specific shapes and structures of the respective parts shown in the above-described best mode are merely examples of the implementation of the present invention, and the technical scope of the present invention is limited by these. It should not be interpreted in a general way.

2 to 10 show the best mode for carrying out the present invention, and this figure is a schematic perspective view showing an image display device. FIG. It is a longitudinal cross-sectional view of an image display apparatus. It is a front view which shows a housing | casing and the light source unit arrange | positioned at this. It is a rear view which shows a housing | casing and the duct attached to this. It is a longitudinal cross-sectional view which shows an example of the circulation direction of cooling air. It is an expanded sectional view which shows the positional relationship of a duct and a waste heat fin. It is an enlarged plan view which shows the state by which the fan for discharge | emission was attached to the front-end | tip part of a heat exhaust fin. FIG. 9 and FIG. 10 show an example in which the arrangement position of a fan or the like is changed, and this figure is a front view showing an example in which the fan is divided into an upper end portion and a lower end portion of the casing. It is a rear view which shows the example which has arrange | positioned the duct in the horizontally long state in the upper end part and lower end part of a housing | casing, and has arrange | positioned the fan in the position corresponding to the left-right both ends or the center part in the left-right direction. It is a front view which shows the example which has arrange | positioned the fan directly above the light source unit.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Image display apparatus, 3 ... Image display part, 4 ... Illuminating device, 5 ... Housing, 6 ... Arrangement surface part, 7 ... Upper side surface part, 8 ... Lower side surface part, 9 ... Left side part, 10 ... Right side part, 13 DESCRIPTION OF SYMBOLS ... Light source unit, 13a ... Board | substrate, 13b ... Light source, 14 ... Holding frame, 15 ... Fan (blowing means), 16 ... Duct, 16b ... Air flow path, 17 ... Heat exhaust fin, 18 ... Heat conduction means, 19 ... Sealing Space, 21 ... radiating fin, 22 ... exhaust fan

Claims (3)

A housing having an arrangement surface for arranging a plurality of light sources;
Air blowing means for sending cooling air to suppress the temperature rise of the light source,
An air flow passage communicating with the internal space of the housing is formed on the opposite side of the surface on which the light source is disposed across the placement surface portion of the housing,
Forming a sealed space isolated from the outside by the internal space of the housing and the air flow passage,
The cooling air is circulated by sending it in a predetermined direction in the sealed space by the blowing means,
Attach the duct with the air flow passage inside to the housing
A heat exhaust fin that absorbs heat from the cooling air flowing through the air flow passage and releases the absorbed heat to the outside of the sealed space is provided.
Arranging a part of the exhaust heat fin inside the duct,
A heat conduction means for absorbing heat from the cooling air and conducting the absorbed heat to the exhaust heat fin is arranged inside the duct ,
A discharge fan for discharging heat released from the exhaust heat fin to the outside of the sealed space is attached to the exhaust heat fin,
Provided on the housing is a side surface projecting from the outer peripheral edge of the placement surface portion in a direction substantially orthogonal to the placement surface portion,
An illuminating device characterized in that a radiation fin for releasing heat generated by light emission of a light source is provided on at least a part of the side surface . A plurality of light sources are arranged on a substrate to form a light source unit,
The lighting device according to claim 1, wherein cooling air is caused to flow on the substrate of the light source unit by the blowing means. An image display device in which an image display unit that displays an image is attached to a housing having a placement surface portion, and a plurality of light sources that function as a backlight of the image display portion are placed on the placement surface portion of the housing,
Blower means for sending cooling air to suppress the temperature rise of the light source,
An air flow passage communicating with the internal space of the housing is formed on the opposite side of the surface on which the light source is disposed across the placement surface portion of the housing,
Forming a sealed space isolated from the outside by the internal space of the housing and the air flow passage,
The cooling air is circulated by sending it in a predetermined direction in the sealed space by the blowing means,
Attach the duct with the air flow passage inside to the housing
A heat exhaust fin that absorbs heat from the cooling air flowing through the air flow passage and releases the absorbed heat to the outside of the sealed space is provided.
Arranging a part of the exhaust heat fin inside the duct,
A heat conduction means for absorbing heat from the cooling air and conducting the absorbed heat to the exhaust heat fin is arranged inside the duct ,
A discharge fan for discharging heat released from the exhaust heat fin to the outside of the sealed space is attached to the exhaust heat fin,
The housing is formed of a material having thermal conductivity, and the housing is provided with a side surface portion that protrudes from the periphery of the placement surface portion in a direction substantially orthogonal to the placement surface portion,
A holding frame for holding the image display unit is provided,
Attach a holding frame that holds the image display unit to the housing,
An image display device, wherein a radiation fin for releasing heat generated by light emission of a light source is provided on at least a part of a side surface portion of a housing .

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