JP2012208242A - Projection type video display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a projection type video display device capable of achieving downsizing at the time of non-use.SOLUTION: A projection type video display device 100 includes a housing 200 housing a light source 10, a DMD 350, and a projection optical system 320. The housing 200 has a first interior housing 251 for housing a projection lens group 321 and a second interior housing 252 for housing a concave mirror 322. The concave mirror 322 is disposed so as to shift in an opposite side of the DMD 350 with respect to an optical axis L of the projection optical system 320. The first interior housing 251 supports the second interior housing 252 slidably along the optical axis L of the projection optical system 320. The housing 200 expands and contracts by sliding of the second interior housing 252.

Description

  The present invention relates to a projection display apparatus including a light modulation element that modulates light emitted from a light source and a projection optical system that projects light emitted from the light modulation element onto a projection surface.

  2. Description of the Related Art Conventionally, there is known a projection display apparatus including a light modulation element that modulates light emitted from a light source and a casing that houses a projection optical system that projects light emitted from the light modulation element onto a projection surface. .

  In recent years, in order to shorten the distance between the projection display apparatus and the projection surface, a projection display apparatus in which a concave mirror is arranged in the projection optical system has been proposed.

  By the way, when the light emitted from the light modulation element is reflected by the concave mirror and the light emitted from the light modulation element is projected onto the projection surface, a certain distance is provided between the light modulation element and the concave mirror. is required.

  On the other hand, downsizing of the projection display apparatus is desired. As a miniaturization of a projection type video display device that realizes miniaturization, a projection type video display device that slides a concave mirror in the optical axis direction of the projection optical system has been proposed (for example, Patent Document 1).

JP 2009-86315 A

  By the way, the above-described projection display apparatus is preferably small when not in use, from the viewpoint of carrying around.

  Accordingly, the present invention has been made to solve the above-described problems, and an object thereof is to provide a projection display apparatus that can be reduced in size when not in use.

  A projection display apparatus according to a first feature includes a light source (light source 10), a light modulation element (DMD350) that modulates light emitted from the light source, and a projection surface that emits light emitted from the light modulation element. A housing (housing 200) for housing a projection optical system (projection optical system 320) to be projected onto is provided. The projection optical system includes a projection lens group (projection lens group 321) that projects light emitted from the light modulation element, and a concave mirror (concave surface) that reflects light emitted from the projection lens group toward the projection surface. Mirror 322). The housing includes a first housing (first interior housing 251) that houses the projection lens group, and a second housing (second interior housing 252) that houses the concave mirror. The light modulation element is arranged so as to shift to one side with respect to the optical axis of the projection optical system. The concave mirror is arranged to shift to the other side with respect to the optical axis of the projection optical system. The first casing slidably supports the second casing along the optical axis of the projection optical system. The casing expands and contracts by sliding the second casing.

  In the first feature, the first casing has a transmission region that transmits light reflected by the concave mirror in the extended state of the casing. A part of the second casing covers the transmissive region in the contracted state of the casing.

  In the first feature, the first housing has a V-shaped slope in a side view. The V-shaped inclined surface is inclined so as to be closer to the optical axis of the projection optical system as it is closer to the light modulation element, and to be separated from the optical axis of the projection optical system as it is closer to the light modulation element. And a second slope. The transmission region is provided on the first slope. The V-shaped slope has a shape that does not block light reflected by the concave mirror in the extended state of the housing.

  1st characteristic WHEREIN: The said 1st housing | casing and the said 2nd housing | casing are the shapes which maintain the state by which the said concave mirror was sealed by the said 1st housing | casing and the said 2nd housing | casing in the expansion-contraction of the said housing | casing. Have

  According to the present invention, it is possible to provide a projection display apparatus that can be reduced in size when not in use.

FIG. 1 is a diagram showing a schematic configuration of a projection display apparatus 100 according to the first embodiment. FIG. 2 is a diagram showing a schematic configuration of 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 the illumination optical system 310 according to the first embodiment. FIG. 6 is a diagram showing a projection display apparatus 100 according to the first modification. FIG. 7 is a diagram illustrating a projection display apparatus 100 according to the second modification.

  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]
A projection display apparatus according to an embodiment includes a light source, a light modulation element that modulates light emitted from the light source, and a projection optical system that projects light emitted from the light modulation element onto a projection surface. Prepare the body. The projection optical system includes a projection lens group that projects light emitted from the light modulation element, and a concave mirror that reflects light emitted from the projection lens group toward the projection surface. The housing includes a first housing that houses the projection lens group, and a second housing that houses the concave mirror. The light modulation element is arranged so as to shift to one side with respect to the optical axis of the projection optical system. The concave mirror is arranged to shift to the other side with respect to the optical axis of the projection optical system. The first housing slidably supports the second housing along the optical axis of the projection optical system. The casing expands and contracts by sliding the second casing.

  In the embodiment, the first casing supports the second casing in a slidable manner along the optical axis of the projection optical system. The concave mirror is disposed so as to shift to the opposite side of the light modulation element with respect to the optical axis of the projection optical system. Therefore, when the casing is retracted, the concave mirror can be accommodated in an empty space provided on the opposite side of the light modulation element with respect to the optical axis of the projection optical system.

[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.

  Here, the housing | casing 200 is comprised so that expansion-contraction is possible so that it may mention later. Moreover, the housing | casing 200 has the V-shaped slope 210 in side view. The V-shaped inclined surface 210 has a first inclined surface 211 that becomes deeper as it approaches the projection surface, and a second inclined surface 212 that becomes deeper as it moves away from the projection surface. The first inclined surface 211 is provided with a transmission region 213 that transmits video light when the housing 200 is stretched.

  The V-shaped inclined surface 210 has a shape (inclination) that does not block the image light when the housing 200 is expanded or contracted. The transmission region 213 may be an opening or may be configured by a transparent member such as glass.

(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 diagram showing a front view of the projection display apparatus 100. FIG. 4 is a diagram showing a side view of the projection display apparatus 100. 3 and 4 show the internal configuration of the projection display apparatus 100 through the casing 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 substrate 340, and a DMD 350.

  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 concave mirror 322.

  The projection lens group 321 emits image light emitted from the DMD 350 to the concave 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 concave mirror 322.

  The concave mirror 322 reflects the image light emitted from the DMD 350 to the projection plane side. The concave mirror 322 is, for example, an aspherical mirror having a concave surface on the DMD 350 side. As shown in FIG. 4, the concave mirror 322 is shifted to the D side with respect to the optical axis L of the projection optical system 320. That is, the concave mirror 322 is shifted to the opposite side of the DMD 350 with respect to the optical axis L of the projection optical system 320.

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

  The substrate 340 includes a main control circuit that controls the operation of the projection display apparatus 100, a power conversion circuit that converts AC power into DC power, and the like.

  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 C side with respect to optical axis L of projection optical system 320.

  In the first embodiment, the housing 200 includes a first interior housing 251, a second interior housing 252, a first exterior housing 261, and a second exterior housing 262.

  The first interior housing 251 houses the projection lens group 321. The second interior housing 252 houses the concave mirror 322. The first exterior housing 261 houses the first interior housing 251 together with the projection lens group 321. The second exterior housing 262 houses the second interior housing 252 together with the concave mirror 322.

  Here, it should be noted that the second interior housing 252 supports the concave mirror 322 so that the concave mirror 322 does not move. In 1st Embodiment, the 2nd interior housing | casing 252 supports the concave mirror 322 from the both sides (left-right direction) of the concave mirror 322 in front view (refer FIG. 3). Further, the second interior housing 252 supports the concave mirror 322 from both sides (vertical direction) of the concave mirror 322 in a side view.

  Note that the combination of the first interior casing 251 and the first exterior casing 261 may be considered as the first casing that houses the projection lens group 321. Similarly, the combination of the second inner casing 252 and the second outer casing 262 may be considered as a second casing that houses the concave mirror 322.

  Here, the first interior casing 251 supports the second interior casing 252 so as to be slidable along the optical axis L of the projection optical system 320. Therefore, the housing 200 expands and contracts by sliding the second interior housing 252. The second exterior casing 262 is accommodated in the first exterior casing 261 as the casing 200 is degenerated.

  First, as shown in FIG. 3, the first interior housing 251 includes a guide rail 451A and a guide rail 451B. The guide rail 451A and the guide rail 451B are rails for sliding the second interior housing 252 along the optical axis L of the projection optical system 320. That is, the second interior housing 252 slides along the guide rail 451A and the guide rail 451B.

  Here, the guide rail 451A has a locking portion 451C for locking the second interior housing 252 in the extended state of the housing 200. Similarly, the guide rail 451B has a locking portion 451D for locking the second interior housing 252 in the extended state of the housing 200.

  Since the second interior casing 252 is locked by the locking portions 451C and 451D, the concave mirror 322 accommodated in the second interior housing 252 is locked at an appropriate position. In other words, the locking portion 451 </ b> C and the locking portion 451 </ b> D lock the second interior housing 252 at a position where the image light reflected by the concave mirror 322 does not pass through the transmission region 213.

  Note that the guide rail 451A and the guide rail 451B may have a locking portion for locking the second interior housing 252 in the contracted state of the housing 200.

  Secondly, as shown in FIG. 4, the second interior housing 252 includes a guide rail 452A. The first interior housing 251 has guide rails 452B. The guide rail 452A and the guide rail 452B are rails for sliding the second interior housing 252 along the optical axis L of the projection optical system 320. That is, the second interior housing 252 slides along the guide rail 452A and the guide rail 452B.

  The guide rail 452A and the guide rail 452B have a locking portion for locking the second interior housing 252 in the extended state of the housing 200, like the guide rail 451A and the guide rail 451B. Also good.

  Further, the guide rail 452A and the guide rail 452B may have a locking portion for locking the second interior housing 252 in the contracted state of the housing 200.

  Third, as shown in FIG. 4, the first interior housing 251 has a V-shaped inclined surface 251 </ b> A in a side view. The V-shaped inclined surface 251A is a first inclined surface 251B that is inclined so as to be closer to the optical axis L of the projection optical system 320 as it is closer to the DMD 350, and And a slope 251C. The first inclined surface 251B is provided with a transmission region 213 that transmits video light when the housing 200 is expanded and contracted.

  The V-shaped slope 251A, the first slope 251B, and the second slope 251C are the same as the V-shaped slope 210, the first slope 211, and the second slope 212 described above. Similarly to the V-shaped inclined surface 210, the V-shaped inclined surface 251 </ b> A has a shape (inclined) that does not block the image light reflected by the concave mirror 322 when the housing 200 is stretched.

  Fourth, as shown in FIG. 4, a part of the second interior casing 252 covers the transmission region 213 in the contracted state of the casing 200. For example, a portion of the second interior housing 252 where the guide rail 452A is provided covers the transmission region 213 when the housing 200 is in the contracted state.

  Note that the first interior casing 251 and the second interior casing 252 maintain a state in which the concave mirror 322 is sealed by the first interior casing 251 and the second interior casing 252 when the casing 200 expands and contracts. That is, the housing 200 is configured such that the concave mirror 322 is not exposed to the outside of the housing 200 through expansion and contraction of the housing 200 (sliding of the second interior housing 252).

  “Sealed” means a coating that prevents the user from touching the concave mirror 322. Therefore, it should be noted that the case of a slight gap is included in the concept of “sealing”.

(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.

(Function and effect)
In the first embodiment, the first interior casing 251 supports the second interior casing 252 so as to be slidable along the optical axis L of the projection optical system 320. The concave mirror 322 is disposed so as to shift to the opposite side of the DMD 350 with respect to the optical axis L of the projection optical system 320. Therefore, when the housing 200 is retracted, the concave mirror can be accommodated in an empty space provided on the opposite side of the DMD 350 with respect to the optical axis L of the projection optical system 320.

  In the first embodiment, the guide rail 451A and the guide rail 451B have a locking portion 451C and a locking portion 451D for locking the second interior housing 252 in the extended state of the housing 200. Therefore, the concave mirror 322 accommodated in the second interior housing 252 can be locked at an appropriate position.

  In the first embodiment, a part of the second interior casing 252 covers the transmission region 213 in the contracted state of the casing 200. Therefore, when the transmissive region 213 is a transparent member such as glass, damage to the transparent member constituting the transmissive region 213 can be suppressed. In the case where the transmissive region 213 is an opening, it is possible to prevent dust and the like from entering from the opening constituting the transmissive region 213.

[Modification 1]
Hereinafter, Modification Example 1 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  In the first modification, the shape of the first exterior housing 261 is different from that in the first embodiment. In the first modification, as shown in FIG. 6, a part of the first exterior housing 261 protrudes on the second inclined surface 251 </ b> C of the V-shaped inclined surface 251 </ b> A.

[Modification 2]
Hereinafter, Modification Example 2 of the first embodiment will be described. In the following, differences from the first embodiment will be mainly described.

  In the modified example 2, as shown in FIG. 7, the guide rail 452B described above is omitted. Further, along with the omission of the guide rail 452B, the portion that supports the concave mirror 322 from the lower side is omitted from the second interior housing 252.

  As a result, when the housing 200 is retracted, the space in which the second interior housing 252 is to be accommodated in the first interior housing 251 is reduced. Therefore, the space in the first interior casing 251 can be used effectively. For example, the size of the cooling device 330 can be increased.

[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 first casing is configured by the first interior casing 251 and the first exterior casing 261, and the second casing is configured by the second interior casing 252 and the second exterior casing 262. . However, the embodiment is not limited to this. Specifically, the first interior casing 251 and the first exterior casing 261 may be one casing. Similarly, the second inner casing 252 and the second outer casing 262 may be one casing.

  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 ... Case, 210 ... V character Slope, 211 ... first slope, 212 ... second slope, 213 ... transmission region, 251 ... first interior housing, 251A ... V-shaped slope, 251B ... first slope, 251C ... second slope, 252 ... second interior Case: 261: first exterior case, 262: second exterior case, 310: illumination optical system, 320: projection optical system, 321: projection lens group, 322: concave mirror, 330: cooling device, 340: substrate 350 ... DMD, 451A ... guide rail, 451B ... guide rail, 451C ... engagement part, 451D ... engagement part, 452A ... guide rail, 452B ... guide rail

Claims (4)

A projection display apparatus comprising: a light source; a light modulation element that modulates light emitted from the light source; and a housing that houses a projection optical system that projects light emitted from the light modulation element onto a projection plane. There,
The projection optical system includes a projection lens group that projects light emitted from the light modulation element, and a concave mirror that reflects light emitted from the projection lens group to the projection surface side,
The housing includes a first housing that houses the projection lens group, and a second housing that houses the concave mirror,
The light modulation element is arranged to shift to one with respect to the optical axis of the projection optical system,
The concave mirror is arranged so as to shift to the other with respect to the optical axis of the projection optical system,
The first housing slidably supports the second housing along the optical axis of the projection optical system,
The projection type video display device, wherein the casing expands and contracts by sliding of the second casing. The first housing has a transmission region that transmits light reflected by the concave mirror in the extended state of the housing;
2. The projection display apparatus according to claim 1, wherein a part of the second casing covers the transmissive region in a contracted state of the casing. The first housing has a V-shaped slope in a side view,
The V-shaped inclined surface is inclined so as to be closer to the optical axis of the projection optical system as it is closer to the light modulation element, and to be separated from the optical axis of the projection optical system as it is closer to the light modulation element. And a second slope that
The transmission region is provided on the first slope,
3. The projection display apparatus according to claim 2, wherein the V-shaped inclined surface has a shape that does not block light reflected by the concave mirror when the housing is extended. 4.   The first casing and the second casing have a shape that maintains a state in which the concave mirror is sealed by the first casing and the second casing when the casing expands and contracts. The projection display apparatus according to claim 1.

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