JP2012118230A - Projection type video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type video display device capable of arranging an illumination optical system and a projection optical system with space saving.SOLUTION: A projection type video display device 100 includes a housing 200 for housing an illumination optical system 310, a projection optical system 320, and a cooling device 330. The housing 200 includes an arrangement space 400 including a first arrangement space 410 and a second arrangement space 420. The projection optical system 320 is arranged in the first arrangement space 410. At least a part of the illumination optical system 310 and the cooling device 330 are arranged in the second arrangement space 420. The illumination optical system 310 and the cooling device 330 are arranged in a positional relation symmetrical with respect to the projection optical system 320.

Description

  The present invention relates to a projection display apparatus having a housing that houses an illumination optical system, a projection optical system, and a cooling unit.

  2. Description of the Related Art Conventionally, a projection display apparatus having a projection optical system that projects light emitted from an illumination optical system onto a projection surface is known. The illumination optical system includes, for example, a light source such as LED (Light Emitting Diode) and a light modulation element that modulates light emitted from the light source. The projection display apparatus has a cooling unit such as a heat sink for cooling the light source.

  Here, in the projection display apparatus, the illumination optical system and the projection optical system are generally arranged so that the optical axis of the illumination optical system is perpendicular to the optical axis of the projection optical system ( For example, Patent Document 1).

JP 2004-45718 A

  By the way, there is a need to place the projection optical system in the center in the housing that houses the illumination optical system, the projection optical system, and the cooling unit. Further, downsizing of the housing is also desired.

  In a general projection display apparatus, the optical axis of the illumination optical system is perpendicular to the optical axis of the projection optical system. Therefore, the projection optical system is arranged at the center of the casing, and the illumination optical system and the projection optical system are arranged. The housing for housing the system and the cooling unit cannot be reduced in size.

  Accordingly, the present invention has been made to solve the above-described problems, and the illumination optical system, the projection optical system, and the cooling unit are disposed in a space-saving manner while the projection optical system is disposed at the center of the casing. It is an object of the present invention to provide a projection display apparatus that can perform the above-described operation.

  The projection display apparatus (projection display apparatus 100) according to the first embodiment accommodates an illumination optical system (illumination optical system 310), a projection optical system (projection optical system 320), and a cooling unit (cooling apparatus 330). A housing (housing 200). The housing includes a virtual cylindrical arrangement space (arrangement space 400) having a circumscribed circle of the projection optical system in a cross section perpendicular to the optical axis of the projection optical system as a bottom. The arrangement space includes a substantially conical first arrangement space (first arrangement space 410) and a second arrangement space (second arrangement space 420) excluding the first arrangement space. The projection optical system is arranged in the first arrangement space. At least a part of the illumination optical system and the cooling unit is arranged in the second arrangement space. The illumination optical system and the cooling unit are arranged in a symmetrical positional relationship with respect to the projection optical system.

  In the first feature, the cooling unit is connected to the illumination optical system by a heat pipe.

  In the first feature, the illumination optical system includes a light source and a light modulation element that modulates light emitted from the light source. The casing accommodates a duct that forms an air flow path for releasing heat generated by the light modulation element to the outside of the casing. The duct forms an air flow path for releasing heat absorbed by the cooling unit to the outside of the housing.

  In the first feature, the air flow path formed by the duct further includes a fan that forms an air flow from above to below.

  In the second feature, the projection display apparatus (projection display apparatus 100) contains an illumination optical system (illumination optical system 310), a projection optical system (projection optical system 320), and a cooling unit (cooling apparatus 330). A housing (housing 200). In the front view of the housing, the illumination optical system and the cooling unit are arranged in a symmetrical positional relationship with respect to the projection optical system. In the side view of the casing, the illumination optical system and the cooling unit are arranged so as to overlap the projection optical system.

  According to the present invention, it is possible to provide a projection display apparatus that can arrange an illumination optical system, a projection optical system, and a cooling unit in a space-saving manner while arranging the projection optical system in the center of the casing. it can.

FIG. 1 is a diagram showing an outline of a projection display apparatus 100 according to the first embodiment. FIG. 2 is a diagram schematically showing the projection display apparatus 100 according to the first embodiment. FIG. 3 is a diagram showing details of the projection display apparatus 100 according to the first embodiment. FIG. 4 is a diagram showing details of the projection display apparatus 100 according to the first embodiment. FIG. 5 is a diagram showing a configuration of the illumination optical system 310 according to the first embodiment. It is a figure which shows the structure of the heat pipe 340 which concerns on 1st Embodiment. FIG. 7 is a diagram for explaining the arrangement space according to the first embodiment.

  Hereinafter, a projection display apparatus according to an embodiment of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals.

  However, it should be noted that the drawings are schematic and ratios of dimensions and the like are different from actual ones. Therefore, specific dimensions and the like should be determined in consideration of the following description. Moreover, it is a matter of course that portions having different dimensional relationships and ratios are included between the drawings.

[Outline of Embodiment]
First, the projection display apparatus according to the embodiment includes a housing that houses an illumination optical system, a projection optical system, and a cooling unit. The casing has a virtual cylindrical arrangement space having a circumscribed circle of the projection optical system in a cross section perpendicular to the optical axis of the projection optical system as a bottom. The arrangement space has a substantially conical first arrangement space and a second arrangement space excluding the first arrangement space. The projection optical system is arranged in the first arrangement space. At least a part of the illumination optical system and the cooling unit is arranged in the second arrangement space. The illumination optical system and the cooling unit are arranged in a symmetrical positional relationship with respect to the projection optical system.

  In the embodiment, the projection optical system is provided in the substantially conical first arrangement space, and at least one of the illumination optical system and the cooling unit is provided in a dead space (second arrangement space) generated in the housing by the arrangement of the projection optical system. Parts are arranged. That is, since the dead space is effectively used, the illumination optical system, the projection optical system, and the cooling unit can be arranged in a space-saving manner.

  In the embodiment, the illumination optical system and the cooling unit are arranged in a symmetrical positional relationship with respect to the projection optical system. Therefore, the projection optical system can be arranged at the center of the casing.

  Second, the projection display apparatus has a housing that houses an illumination optical system, a projection optical system, and a cooling unit. In front view of the housing, the illumination optical system and the cooling unit are arranged in a symmetrical positional relationship with respect to the projection optical system. In a side view of the housing, the illumination optical system and the cooling unit are arranged so as to overlap the projection optical system.

  In the embodiment, the illumination optical system and the cooling unit are arranged in a symmetrical positional relationship with respect to the projection optical system in a front view of the housing. In a side view of the housing, the illumination optical system and the cooling unit are arranged so as to overlap the projection optical system. Therefore, the illumination optical system, the projection optical system, and the cooling unit can be arranged in a space-saving manner while arranging the projection optical system in the center of the casing.

[First Embodiment]
(Outline of projection display device)
Hereinafter, an outline of the projection display apparatus according to the first embodiment will be described with reference to the drawings. FIG. 1 is a diagram showing a projection display apparatus 100 (floor projection) according to the first embodiment. FIG. 2 is a diagram showing the projection display apparatus 100 (wall surface projection) according to the first embodiment.

  As shown in FIGS. 1 and 2, the projection display apparatus 100 has a housing 200 and projects an image on a projection surface (not shown). The projection surface may be provided on the floor surface as shown in FIG. 1, or may be provided on the wall surface as shown in FIG. Note that the housing 200 is provided with a transmission region 211 that transmits video light.

(Details of projection display device)
Details of the projection display apparatus according to the first embodiment will be described below with reference to the drawings. 3 and 4 are diagrams showing details of the projection display apparatus 100. FIG. FIG. 3 is a view of the projection display apparatus 100 viewed from the direction A shown in FIGS. 1 and 2 (front view). FIG. 4 is a view of the projection display apparatus 100 viewed from the direction B shown in FIG. 3 (side view). 3 and 4 show the internal configuration of the projection display apparatus 100 through the housing 200. FIG.

  As shown in FIGS. 3 and 4, the projection display apparatus 100 includes an illumination optical system 310, a projection optical system 320, a cooling device 330, a heat pipe 340, a DMD 350, a heat sink 360, and a duct 370. And a fan 380.

  As will be described later, the illumination optical system 310 includes a light source and the like, and emits light to be applied to the DMD 350. Details of the illumination optical system 310 will be described later (see FIG. 5).

  The projection optical system 320 projects the image light emitted from the DMD 350 onto the projection surface. For example, the projection optical system 320 includes a projection lens group 321 and a reflection mirror 322.

  The projection lens group 321 emits video light emitted from the DMD 350 to the reflection mirror 322 side. The projection lens group 321 has a substantially circular lens centered on the optical axis L of the projection optical system 320 and a shape (for example, a A half-semicircular lens).

  It should be noted that the diameter of the lens included in the projection optical system 320 is larger as it is closer to the reflection mirror 322.

  The reflection mirror 322 reflects the image light emitted from the DMD 350 to the projection plane side. The reflection mirror 322 is, for example, an aspherical mirror having a concave surface on the DMD 350 side.

  The cooling device 330 has a function of cooling a heat source (for example, a light source) of the illumination optical system 310. Specifically, the cooling device 330 absorbs heat generated by the heat source of the illumination optical system 310 via the heat pipe 340. For example, the cooling device 330 is a heat radiating member such as a heat sink.

  The heat pipe 340 is a pipe that transmits heat generated by a heat source (for example, a light source) of the illumination optical system 310 to the cooling device 330. The heat pipe 340 is configured by a member (such as copper) having high thermal conductivity. The details of the heat pipe 340 will be described later (see FIG. 6).

  The DMD 350 is composed of a plurality of minute mirrors, and the plurality of minute mirrors are movable. The DMD 350 switches whether to reflect the light emitted from the illumination optical system 310 by changing the angle of each micromirror.

  Here, it should be noted that the center of the DMD 350 is shifted from the optical axis L of the projection optical system 320 as shown in FIG. Specifically, the center of DMD 350 is shifted to the projection plane side with respect to optical axis L of projection optical system 320.

  The heat sink 360 is a heat radiating member that cools the DMD 350.

  Duct 370 forms an air flow path that releases heat generated by DMD 350 to the outside of housing 200. Further, in the first embodiment, an air flow path for releasing the heat absorbed by the cooling device 330 to the outside of the housing 200 is formed.

  In other words, the duct 370 has both a function of releasing heat generated by the DMD 350 to the outside of the housing 200 and a function of releasing heat generated by the heat source of the illumination optical system 310 to the outside of the housing 200. It should be noted that the cooling device 330 and the heat sink 360 described above are disposed in the duct 370.

  The fan 380 forms an air flow from above to below in the air flow path formed by the duct 370. Specifically, the fan 380 includes a fan 380A and a fan 380B.

  The fan 380 </ b> A is a fan that guides air outside the housing 200 to the inside of the duct 370. As shown in FIG. 3, the fan 380 </ b> A is disposed on the upper portion of the housing 200 (duct 370). On the other hand, the fan 380 </ b> B is a fan that guides the air inside the duct 370 to the outside of the housing 200. The fan 380B is arrange | positioned at the lower part of the housing | casing 200 (duct 370), as shown in FIG.

  As described above, the air flow from the upper side to the lower side is formed by the fans 380A and 380B. However, it should be noted that the fans 380A and 380B are not necessarily required. Any one of the fans 380A and 380B may be provided.

  In the first embodiment, as shown in FIG. 3, it is preferable that the illumination optical system 310 and the cooling device 330 are arranged in a symmetrical positional relationship with respect to the projection optical system 320 in the front view of the housing 200. In addition, as shown in FIG. 4, it is preferable that the illumination optical system 310 and the cooling device 330 are arranged so as to overlap the projection optical system 320 in a side view of the housing 200.

(Configuration of illumination optical system)
Hereinafter, the configuration of the illumination optical system according to the first embodiment will be described with reference to the drawings. FIG. 5 is a diagram showing a configuration of the illumination optical system 310 according to the first embodiment.

As shown in FIG. 5, the illumination optical system 310 includes a light source 10 (light source 10R, light source 10G, and light source 10B), a dichroic mirror 20, a dichroic mirror 30, a rod integrator 40, a reflection mirror 50, and a reflection mirror 60. And a launch mirror 70.

  The light source 10R is a light source that emits red component light R, and is, for example, a red LED (Light Emitting Diode) or a red LD (Laser Diode). The light source 10G is a light source that emits green component light G, and is, for example, a green LED or a green LD. The light source 10B is a light source that emits blue component light B, and is, for example, a blue LED or a blue LD.

  The dichroic mirror 20 transmits the green component light G emitted from the light source 10G and reflects the blue component light B emitted from the light source 10B. The dichroic mirror 30 transmits the green component light G and the blue component light B, and reflects the red component light R emitted from the light source 10R.

  The rod integrator 40 has a light incident surface, a light emitting surface, and a light reflecting side surface provided from the outer periphery of the light incident surface to the outer periphery of the light emitting surface. The rod integrator 40 uniformizes the color component light emitted from the light source 10 (light source 10R, light source 10G, and light source 10B).

  The reflection mirror 50 and the reflection mirror 60 reflect the color component light emitted from the rod integrator 40 and guide the color component light emitted from the rod integrator 40 to the launch mirror 70.

  The launch mirror 70 reflects the color component light guided by the reflection mirror 50 and the reflection mirror 60 to the DMD 350 side.

(Configuration of heat pipe)
Hereinafter, the heat pipe according to the first embodiment will be described. FIG. 6 is a diagram illustrating a configuration of the heat pipe 340 according to the first embodiment.

  As shown in FIG. 6, one end of the heat pipe 340 is connected to the cooling device 330. On the other hand, the heat pipe 340 is provided with a heat receiving part 341 connected to a heat source (for example, the light source 10) of the illumination optical system 310.

  Accordingly, the heat receiving unit 341 receives heat generated by the heat source of the illumination optical system 310, and the heat received by the heat receiving unit 341 is transmitted to the cooling device 330 via the heat pipe 340.

(Placement space)
Hereinafter, the arrangement space according to the first embodiment will be described with reference to the drawings. FIG. 7 is a view for explaining the arrangement space 400 according to the first embodiment.

  As shown in FIG. 3, the housing 200 has an arrangement space 400 configured by a first arrangement space 410 and a second arrangement space 420.

  The arrangement space 400 has a virtual cylindrical shape with the circumscribed circle of the projection optical system 320 in the cross section perpendicular to the optical axis L of the projection optical system 320 as the bottom. The bottom of the arrangement space 400 has the optical axis L of the projection optical system 320 as the center. The bottom of the arrangement space 400 is a circumscribed circle of a portion (for example, the reflection mirror 322) that protrudes to the outermost side in the projection optical system 320 in a cross section perpendicular to the optical axis L of the projection optical system 320.

  The first arrangement space 410 has a substantially conical shape. Specifically, the first arrangement space 410 has a shape that widens from the DMD 350 side toward the reflection mirror 322 side.

  In the first arrangement space 410, a projection optical system 320 is provided. The projection optical system 320 may be arranged so that the entire projection optical system 320 is completely included in the first arrangement space 410, and is arranged so that a part of the projection optical system 320 protrudes from the first arrangement space 410. May be.

  The second arrangement space 420 is a space excluding the first arrangement space 410 in the arrangement space 400. The volume of the second arrangement space 420 increases from the reflection mirror 322 side toward the DMD 350 side.

  In the second arrangement space 420, at least a part of the illumination optical system 310 and the cooling device 330 is arranged. For example, the rod integrator 40 among the optical elements included in the illumination optical system 310 is arranged in the second arrangement space 420.

  Here, the illumination optical system 310 and the cooling device 330 are arranged in a symmetrical positional relationship with respect to the projection optical system 320. Specifically, the illumination optical system 310 and the cooling device 330 are arranged in a symmetrical positional relationship with respect to the projection optical system 320 in the vertical direction, the horizontal direction, or the oblique direction.

  Note that the illumination optical system 310 and the cooling device 330 are preferably arranged in a symmetrical positional relationship with respect to the projection optical system 320 in a front view of the housing 200. In addition, the illumination optical system 310 and the cooling device 330 are preferably arranged so as to overlap the projection optical system 320 in a side view of the housing 200.

(Function and effect)
In the first embodiment, the projection optical system 320 is provided in a substantially conical first arrangement space, and an illumination optical system is provided in a dead space (second arrangement space) generated in the housing 200 due to the arrangement of the projection optical system 320. 310 and at least a part of the cooling device 330 are arranged. That is, since the dead space is effectively used, the illumination optical system 310, the projection optical system 320, and the cooling device 330 can be arranged in a space-saving manner.

  In the first embodiment, the illumination optical system 310 and the cooling device 330 are arranged in a symmetrical positional relationship with respect to the projection optical system 320. Therefore, the projection optical system 320 can be arranged at the center of the housing 200.

  In the first embodiment, the illumination optical system 310 and the cooling device 330 are arranged in a symmetrical positional relationship with respect to the projection optical system 320 when the housing 200 is viewed from the front. In the side view of the housing 200, the illumination optical system 310 and the cooling device 330 are arranged so as to overlap the projection optical system 320. Therefore, the illumination optical system 310, the projection optical system 320, and the cooling device 330 can be disposed in a space-saving manner while the projection optical system 320 is disposed at the center of the housing 200.

  In the first embodiment, the cooling device 330 is connected to the illumination optical system 310 and the heat pipe 340. Accordingly, the degree of freedom of arrangement of the cooling device 330 increases.

  In the first embodiment, the duct 370 has both a function of releasing heat generated by the DMD 350 to the outside of the housing 200 and a function of releasing heat generated by the heat source of the illumination optical system 310 to the outside of the housing 200. Therefore, the air flow path formed by the duct 370 can be simplified.

  In the first embodiment, the fan 380 forms an air flow from above to below in the air flow path formed by the duct 370. Therefore, the air in the air flow path can be efficiently released to the outside of the housing 200.

[Other Embodiments]
Although the present invention has been described with reference to the above-described embodiments, it should not be understood that the descriptions and drawings constituting a part of this disclosure limit the present invention. From this disclosure, various alternative embodiments, examples and operational techniques will be apparent to those skilled in the art.

  In the embodiment, a DMD (Digital Micromirror Device) is merely illustrated as the light modulation element. The light modulation element may be a reflective liquid crystal panel.

  In the embodiment, the illumination optical system 310 and the cooling device 330 are arranged in a space provided on the side of the projection optical system 320 in the dead space (second arrangement space 420) generated by the arrangement of the projection optical system 320. It illustrated about. However, the embodiment is not limited to this. Specifically, even if the illumination optical system 310 and the cooling device 330 are arranged in a space provided below the projection optical system 320 in the dead space (second arrangement space 420) generated by the arrangement of the projection optical system 320. Good. Alternatively, the illumination optical system 310 and the cooling device 330 may be arranged in a space provided above the projection optical system 320 in a dead space (second arrangement space 420) generated by the arrangement of the projection optical system 320.

  DESCRIPTION OF SYMBOLS 10 ... Light source, 20 ... Dichroic mirror, 30 ... Dichroic mirror, 40 ... Rod integrator, 50 ... Reflecting mirror, 60 ... Reflecting mirror, 70 ... Mirror, 100 ... Projection type image display apparatus, 200 ... Housing, 211 ... Transmission region , 310 ... Illumination optical system, 320 ... Projection optical system, 321 ... Projection lens group, 322 ... Reflection mirror, 330 ... Cooling device, 340 ... Heat pipe, 341 ... Heat receiving part, 350 ... DMD, 360 ... Heat sink, 370 ... Duct 380 ... Fan, 400 ... Arrangement space, 410 ... First arrangement space, 420 ... Second arrangement space

Claims (5)

A projection display apparatus having a housing that houses an illumination optical system, a projection optical system, and a cooling unit,
The housing has a virtual cylindrical arrangement space having a circumscribed circle of the projection optical system in a cross section perpendicular to the optical axis of the projection optical system as a bottom,
The arrangement space has a substantially conical first arrangement space and a second arrangement space excluding the first arrangement space.
The projection optical system is provided in the first arrangement space,
At least a part of the illumination optical system and the cooling unit is provided in the second arrangement space,
The projection image display apparatus, wherein the illumination optical system and the cooling unit are arranged in a symmetrical positional relationship with respect to the projection optical system.   The projection image display apparatus according to claim 1, wherein the cooling unit is connected to the illumination optical system by a heat pipe. The illumination optical system includes a light source and a light modulation element that modulates light emitted from the light source,
The housing contains a duct that forms an air flow path for releasing heat generated by the light modulation element to the outside of the housing,
The projection image display apparatus according to claim 1, wherein the duct forms an air flow path for releasing heat absorbed by the cooling unit to the outside of the housing.   The projection display apparatus according to claim 1, further comprising a fan that forms an air flow from above to below in an air flow path formed by the duct. A projection display apparatus having a housing that houses an illumination optical system, a projection optical system, and a cooling unit,
In the front view of the housing, the illumination optical system and the cooling unit are arranged in a symmetrical positional relationship with respect to the projection optical system,
In the side view of the casing, the illumination optical system and the cooling unit are arranged so as to overlap the projection optical system.

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