JP2006106189A - Reflection-type image projecting device - Google Patents

Reflection-type image projecting device Download PDF

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Publication number
JP2006106189A
JP2006106189A JP2004290320A JP2004290320A JP2006106189A JP 2006106189 A JP2006106189 A JP 2006106189A JP 2004290320 A JP2004290320 A JP 2004290320A JP 2004290320 A JP2004290320 A JP 2004290320A JP 2006106189 A JP2006106189 A JP 2006106189A
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Japan
Prior art keywords
lens
projection
modulation element
reflection
projection lens
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Pending
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JP2004290320A
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Japanese (ja)
Inventor
Koji Miyauchi
恒治 宮内
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Sharp Corp
シャープ株式会社
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Application filed by Sharp Corp, シャープ株式会社 filed Critical Sharp Corp
Priority to JP2004290320A priority Critical patent/JP2006106189A/en
Publication of JP2006106189A publication Critical patent/JP2006106189A/en
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To realize the parallel displacement of an image projecting range, without causing lowering of the luminance of a projected image and lowering of the illumination efficiency of a reflection-type modulation element. <P>SOLUTION: The reflection type image projecting device projects image light modulated by the reflection-type modulation element 7 to a screen or the like by using a projection lens 9. The projection lens 9 is held to shift on a plane perpendicular to an optical axis. A 1st field lens 6 has a function for separating reflected light from the reflection type modulation element 7 from incident light. That means, the light of the source light receives action by the 1st field lens 6 and is made incident on the reflection-type modulation element 7. The reflection-type modulation element 7 modulates the incident light in accordance with an image signal and reflects it. The reflected light receives action by the 1st field lens 6 again. Then, the reflection-type image projecting device is provided with a 2nd field lens 8 that absorbs aberrations caused by the 1st field lens 6 and refracting the reflected light reflected by the reflection-type modulation element 7 so that the reflected light is becomes easy to be taken by the projection lens 9. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a reflection-type image projection apparatus, and more particularly, to an image projection apparatus such as a projector that can shift a projection image in a direction parallel to a screen, and more particularly to a reflection-type image modulation apparatus using a reflection-type light modulation element. The present invention relates to an image projection apparatus.

In a reflection type image projection apparatus using a reflection type light modulation element, a configuration is disclosed in which a projection image can be shifted in a direction parallel to a screen.
For example, Patent Document 1 discloses a liquid crystal projector that can shift a projected image in a direction parallel to the screen. The liquid crystal projector disclosed herein is configured so that a parallel light beam from a light source is incident on a transmissive liquid crystal display panel to modulate, and the transmitted light is projected onto a screen via a condenser lens and a projection lens. Yes.
In Patent Document 1, the condensing lens and the projection lens are assembled in a lens moving mechanism so that they can be moved together in a one-dimensional direction orthogonal to the optical axis, and the apparatus main body is moved by adjusting the movement of these lenses. The projection range can be shifted in a direction parallel to the screen without causing the projection image to be distorted.

Further, in Patent Document 2, a reflection type image projection apparatus that uses a reflection type modulation element that modulates and reflects illumination light from a light source unit according to an image, and projects light reflected by the reflection type modulation element with a projection lens. Discloses a configuration in which the field lens disposed in front of the reflective modulation element is shifted in conjunction with the projection lens to reduce the light collection efficiency of the projection lens.
JP-A-5-27324 Japanese Patent Laid-Open No. 11-327043

  When using a reflective modulation element, as a general rule, an arrangement is adopted in which illumination light is incident on the modulation element from an oblique direction, and light reflected in a direction different from the incident light path of the illumination light is incident on the projection lens. Is done. For this reason, only by moving the projection lens with the configuration disclosed in Patent Document 1 above, the reflected light of the modulation element is not efficiently taken into the projection lens, and the brightness of the projected image is reduced, or There arises a problem that a part of the image is lost.

  Further, as in Patent Document 2, in a system in which a field lens and a projection lens are shifted in conjunction with each other, an illumination area that forms an image on a reflective modulation element when the field lens moves is a movement of the field lens. It moves with. At this time, in order to further increase the light efficiency, in the recent system in which the illumination area is set with the minimum size for illuminating the reflective modulation element, the field lens moves to illuminate from the effective area of the reflective modulation element. There arises a problem that the area is shifted and a part of the image is lost or extremely dark on the screen.

  The present invention has been made in view of the above-described problems of the prior art, and in a reflection type image projection apparatus using a reflection type modulation element, the brightness of the projection image is reduced and the illumination efficiency of the reflection type modulation element is reduced. It is an object of the present invention to provide a reflection type image projection apparatus that can translate a projection image without causing distortion.

  The first technical means of the present invention includes a light source that emits illumination light, a reflection type modulation element that modulates and reflects the illumination light from the light source according to an image, and light reflected by the reflection type modulation element. In a reflection type image projection apparatus including a projection lens that projects onto a surface, the reflection type image projection apparatus is a light that is affected by both illumination light incident on the reflection type modulation element and reflection light reflected by the reflection type modulation element. A first field lens provided on the road, and a second field lens provided on the optical path between the first field lens and the projection lens. The reflection type image projection apparatus, which is held so as to be shiftable in a direction perpendicular to the optical axis, further includes projection lens shifting means for shifting the projection lens.

  A second technical means is characterized in that, in the first technical means, the second field lens is constituted by a lens group of a single lens or a plurality of lenses.

  According to a third technical means, in the first or second technical means, the projection lens is configured to be freely shiftable in two directions within a plane perpendicular to the optical axis of the projection lens. It is a feature.

  According to a fourth technical means, in any one of the first to third technical means, the projection lens is a zoom lens capable of changing a projection magnification without changing a pupil position. It is a feature.

  According to the present invention, the first field lens provided on the optical path on which the incident light to the reflective modulation element and the reflected light act, and the optical path between the first field lens and the projection lens are provided. By providing the second field lens, the reflected light from the reflective modulation element can be efficiently incident on the projection lens even when the projection range is moved by the shift of the projection lens. . Therefore, it is possible to translate the projection range without reducing the brightness of the projected image and without reducing the illumination efficiency of the reflective modulation element without distorting the image.

  In addition, when the field lens is designed with a single second field lens in the vicinity of the projection lens, if the accuracy of capturing the projection lens and imaging on the screen is not sufficient, a plurality of second field lenses are used. By using the lens group configured by the above, it is possible to efficiently capture the reflected light from the reflective modulation element and to form an image on the screen with high accuracy.

  In addition, since the projection lens is configured to be freely shiftable in two directions within a plane perpendicular to the optical axis, the projection image can be moved freely up and down, left and right, and a reflection type image projection device The degree of freedom of installation of the projector increases, and when projecting an image on the screen, fine adjustment during setting of the reflective image projection apparatus main body is unnecessary, and setting can be performed easily. .

  In addition, by making the projection lens a zoom lens that can change the projection magnification without changing the pupil position, the size of the projection range can be obtained without changing the distance between the reflective image projector and the screen. The projection size can be easily adjusted even when the installation position of the apparatus cannot be arbitrarily selected.

  FIG. 1 is a diagram for explaining the configuration of an embodiment of a reflective image projection apparatus according to the present invention. In the figure, 1 is a lamp, 2 is a color wheel, 3 is a rod, 4 is a first condenser lens, Reference numeral 5 denotes a second condenser lens, 6 denotes a first field lens, 7 denotes a reflective modulation element, 8 denotes a second field lens, and 9 denotes a projection lens.

  As shown in FIG. 1, the optical system of the reflective image projection apparatus of the present embodiment includes a lamp 1 that is a light source that emits illumination light, a color wheel 2 that has a color filter that separates colors in a time division manner, and a reflective type. To the rod 3 that makes the illumination light of the modulation element 7 uniform, the first and second condenser lenses 4 and 5 that refract light source light to optimally illuminate the reflection type modulation element 7, and the reflection type modulation element 7 The first field lens 6 that separates the incident light and the reflected light thereof from each other, and the reflection type modulation element 7 that modulates and reflects the incident light affected by the first field lens 6 according to the image signal. A second field lens 8 that absorbs the aberration generated by the first field lens 6 and refracts the reflected light reflected by the reflective modulation element 7 so as to be easily captured by the projection lens 9; It constituted the light subjected to the action in the field lens 8 from the projection lens 9 composed of a plurality of lens groups to be formed on the screen. The projection lens 9 is held so as to be shiftable to a plane perpendicular to the optical axis.

  As an example of the reflective modulation element 7, a DMD (Digital Micro mirror Device) element can be used. A DMD element is an element in which minute micromirrors are arranged in a lattice pattern. A large number (for example, hundreds of thousands) of minute micromirrors constituting a pixel are integrated on one chip, and each micromirror is controlled to emit light. Switch the reflection direction. At this time, an image is drawn by operating the micromirror at a speed of several thousand times per second.

  FIG. 2 is a diagram schematically showing an optical system using a field lens and its operation. FIG. 2A shows an optical system of a field lens applied to the present invention, and FIG. Is shown in FIG. In FIG. 2, 6 and 6 'are field lenses, and 7 is a reflection type modulation element.

  The light reflected by the reflective modulation element 7 is spread and enters the field lens 6 (6 ′) to form an image. Here, as shown in FIG. 2B, in the conventional method, when the light reflected from the reflective modulation element 7 enters the projection lens 9, it is incident with very large aberration and angle. become. In this state, when the projection lens 9 is shifted in the direction perpendicular to the optical axis in order to move the projection image in parallel, the projection lens 9 does not sufficiently capture light, and the projection image can be shaded. Even if the projection lens 9 can take in all the light well and the projection lens 9 absorbs the aberration, the projection lens 9 absorbs the aberration well due to the position change of the projection lens 9 due to the lens shift. It becomes impossible to squeeze out, and a defect occurs in the focus of the screen according to the position of the lens shift.

  In the embodiment of the present invention, in order to solve the above problem, as shown in FIG. 2A, the second field lens 8 is provided in front of the projection lens 9, that is, the first field lens 6 and the projection. By providing the second field lens 8 on the optical path to the lens 9, the aberration due to the first field lens 6 is removed, and even if the projection lens 9 is shifted, no loss of light capture occurs. Can be. That is, by providing the second field lens 8, the reflected light of the reflective modulation element 7 is efficiently taken into the projection lens 9, so that the lamp power can be reduced and the power consumption of the apparatus can be reduced.

  The second field lens 8 may be a single lens or a lens group including a plurality of lenses. For example, due to the design of the imaging system on the screen, when the second field lens 8 in the vicinity of the projection lens 9 is not able to absorb the aberration, or the projection lens 9 may not be able to absorb the light. In this case, a lens group composed of a plurality of lenses is arranged as the second field lens 8, and the aberration caused by the first field lens 6 in the vicinity of the reflective modulation element 7 is removed by the second field lens 8. In addition, even if the projection lens 9 is shifted, it is possible to prevent loss of light capture.

  FIG. 3 is a diagram showing a configuration example of a shift mechanism (corresponding to the shift means of the present invention) that can shift the projection lens of the reflection type image projection apparatus of the present invention within a plane perpendicular to the optical axis thereof. FIG. 3A is a schematic perspective view of the shift mechanism, FIG. 3B is a schematic side view of the shift mechanism, and FIG. 3C is another schematic side view of the shift mechanism. In FIG. 3, 10 is an operation stick, 11 is a shift plate, 12 is a shift plate gripping part (rotation center axis when the shift plate is shifted by rotational movement), 13 is a unit mounting plate, and 14 is a shift plate for the projection lens. An attachment plate for attachment to the substrate, 15 is a stick holder, and 16 is a slide slit.

The shift mechanism realizes a configuration for shifting the projection lens 9 so that the user can project an image at a desired position when projecting a projection image on a projection surface such as a screen.
In FIG. 3, the projection lens 9 is attached to the shift plate 11 by the attachment plate 14. The shift plate 11 is configured such that it can be freely shifted in a plane direction perpendicular to the optical axis of the projection lens 9, and the projection lens 9 is displaced with the shift operation of the shift plate 11. The unit mounting plate 13 is fixed to the mechanical unit of the projector.

  The unit mounting plate 13 is provided with a stick holder 15, and this stick holder 15 holds an operation stick 10 that can be operated by a user in a swingable manner. The operation stick 10 extends from the stick holder 15 through the through hole provided in the shift plate 11 to the side where the projection lens 9 is disposed. On the side where the projection lens 9 is disposed, the user can operate the operation stick 10, and operates the stick holder 15 as a fulcrum in an arbitrary direction perpendicular to the optical axis of the projection lens 9. The stick 10 can be tilted.

  The operation stick 10 is in contact with the inner wall surface of the through hole of the shift plate 11, and when the operation stick 10 is tilted in an arbitrary direction, the shift plate 11 is shifted according to the direction in which the operation stick 10 is tilted. . In other words, the operation stick 10 is a member that swings about a portion of the stick holder 15 as a fulcrum and a portion that contacts the shift plate 11 as an action point.

  The shift plate 11 is provided with a slide slit 16, and the shift plate gripping portion 12 is inserted through the slide slit 16. The shift plate gripping portion 12 is a shaft-like member that has one end fixed to the unit mounting plate 13 and extends through the slide slit 16.

The user tries to displace the shift plate 11 (that is, the projection lens 9) in that direction by tilting the operation stick 10 in an arbitrary direction. At this time, when the shift plate 11 is to be displaced in the slit major axis direction of the slide slit 16, the shift plate 11 is shifted while the shift plate gripping portion 12 slides in the major axis direction of the slide slit 16.
Further, when the shift plate 11 is to be displaced in the direction orthogonal to the long axis of the slide slit 16, the shift plate 11 rotates around the shift plate gripping portion 12, and the shift plate gripping is performed according to the displacement direction. The portion 12 is displaced in the slit major axis direction of the slide slit 16.

By making the major axis direction of the slide slit 16 coincide with the horizontal direction (horizontal direction) of the projection image, the user can easily move the projection image vertically and horizontally and vertically.
In addition to vertical and horizontal and vertical movements, the user can tilt the operation stick in an oblique direction, so that the shift plate 11 is shifted in accordance with the direction, and the projection image by the projection lens 9 can be translated. In this case, it can be considered that the above-described vertical, horizontal, and vertical displacements are combined.
In other words, the projection lens 9 is configured to be freely shiftable in two axial directions within a plane perpendicular to the optical axis by the shift mechanism as described above. By making it possible to shift to two axes, the projection image projected by the projection lens can be translated in any direction.

With the above-described configuration, the projected image can be shifted in any direction up, down, left and right without distorting the image projected on the projection surface such as a screen.
In order to adjust the image size to be projected, a zoom lens that can change the projection magnification without substantially changing the pupil position on the reflective modulation element 7 side is used as the projection lens 9. desirable. When the size of the projected image does not match the size of the screen, the projection lens 9 can be zoomed to change the projection magnification, and can be adjusted to match the size. Thereby, for example, even when the position of the screen is fixed and the reflective image projection apparatus cannot be arranged in front of the screen, the projection range can be arbitrarily shifted and the image can be projected on the screen. . Further, even when the distance between the screen and the reflective image projection apparatus cannot be set freely, a projection image suitable for the size of the screen can be projected by changing the magnification of the projection lens 9 according to the distance. .

  As another example of the shift means for shifting the projection lens 9, guides are provided so as to coincide with two orthogonal directions (for example, horizontal and vertical directions of the image) in a plane perpendicular to the optical axis of the projection lens 9. The projection lens 9 can be shifted to two axes by using an electric motor or by transmitting the force by means such as rotating a gear by human power. In addition, the projection lens 9 is not a mechanism that shifts along the biaxial direction as described above, but can be freely moved in a plane perpendicular to the optical axis of the projection lens 9 while the projection lens 9 is pressed by a spring. A mechanism that slides may be employed.

It is a figure for demonstrating the structure of one Embodiment of the reflection type image projector of this invention. It is a figure which shows typically the optical system using a field lens, and its effect | action. It is a figure which shows the structural example of the shift mechanism which can shift the projection lens of the reflection type image projector of this invention within the plane perpendicular | vertical with respect to the optical axis.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Lamp, 2 ... Color wheel, 3 ... Rod, 4 ... 1st condenser lens, 5 ... 2nd condenser lens, 6 ... 1st field lens, 7 ... Reflective type modulation element, 8 ... 2nd field 1. Lens, 9 ... Projection lens, 10 ... Operation stick, 11 ... Shift plate, 12 ... Shift plate gripping part, 13 ... Unit mounting plate, 14 ... Mounting plate, 15 ... Stick holder, 16 ... Slide slit.

Claims (4)

  1.   A light source that emits illumination light, a reflective modulation element that modulates and reflects the illumination light from the light source according to an image, and a projection lens that projects light reflected by the reflective modulation element onto a projection surface In the reflection type image projection apparatus provided, the reflection type image projection apparatus is provided on an optical path on which both the illumination light incident on the reflection type modulation element and the reflection light reflected by the reflection type modulation element are affected. A first field lens and a second field lens provided on an optical path between the first field lens and the projection lens, and the projection lens is arranged on an optical axis of the projection lens. A reflection type image projection apparatus, wherein the reflection type image projection apparatus is held so as to be shiftable in a vertical direction, and further includes projection lens shift means for shifting the projection lens.
  2.   2. The reflection type image projection apparatus according to claim 1, wherein the second field lens includes a single lens or a lens group including a plurality of lenses.
  3.   3. The reflection type image projection apparatus according to claim 1, wherein the projection lens is configured to be freely shiftable in two axial directions within a plane perpendicular to the optical axis of the projection lens. Reflective image projection device.
  4.   4. The reflection type image projection apparatus according to claim 1, wherein the projection lens is a zoom lens capable of changing a projection magnification without changing a pupil position. Type image projection device.
JP2004290320A 2004-10-01 2004-10-01 Reflection-type image projecting device Pending JP2006106189A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8104897B2 (en) 2008-02-29 2012-01-31 Samsung Electronics Co., Ltd. Projection optical system having an angled opitcal part and an offset optical part

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0527324A (en) * 1991-08-02 1993-02-05 Casio Comput Co Ltd Projection type display device
JPH05328376A (en) * 1992-03-24 1993-12-10 Sony Corp Liquid crystal projector
JPH0862566A (en) * 1994-08-17 1996-03-08 Sony Corp The liquid crystal projector apparatus
JPH11327043A (en) * 1998-05-20 1999-11-26 Asahi Optical Co Ltd Reflection type picture projector
JP2003075768A (en) * 2001-09-05 2003-03-12 Minolta Co Ltd Optical system for projector

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0527324A (en) * 1991-08-02 1993-02-05 Casio Comput Co Ltd Projection type display device
JPH05328376A (en) * 1992-03-24 1993-12-10 Sony Corp Liquid crystal projector
JPH0862566A (en) * 1994-08-17 1996-03-08 Sony Corp The liquid crystal projector apparatus
JPH11327043A (en) * 1998-05-20 1999-11-26 Asahi Optical Co Ltd Reflection type picture projector
JP2003075768A (en) * 2001-09-05 2003-03-12 Minolta Co Ltd Optical system for projector

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8104897B2 (en) 2008-02-29 2012-01-31 Samsung Electronics Co., Ltd. Projection optical system having an angled opitcal part and an offset optical part

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