JP4043293B2 - Projection display - Google Patents

Projection display Download PDF

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Publication number
JP4043293B2
JP4043293B2 JP2002158380A JP2002158380A JP4043293B2 JP 4043293 B2 JP4043293 B2 JP 4043293B2 JP 2002158380 A JP2002158380 A JP 2002158380A JP 2002158380 A JP2002158380 A JP 2002158380A JP 4043293 B2 JP4043293 B2 JP 4043293B2
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JP
Japan
Prior art keywords
projection lens
adjustment plate
plurality
lens mount
flange
Prior art date
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Application number
JP2002158380A
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Japanese (ja)
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JP2004004206A (en
Inventor
和宣 堀川
和紀 田辺
Original Assignee
松下電器産業株式会社
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Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a projection display device that irradiates a light beam from a light source onto a panel-like light valve that can be modulated for each pixel according to information, and enlarges and projects an image of the light valve onto a screen outside the device using a projection lens. Is.
[0002]
[Prior art]
A conventional projection display device using a liquid crystal panel or a mirror array element as a light valve is known. In a projection display device using three liquid crystal panels and mirror array elements (hereinafter referred to as light valves), the transmitted light or reflected light modulated for each pixel by the three light valves is recombined and guided to the projection lens. It is common to use prisms for this purpose, and the optical axis of the projection lens should be accurately orthogonal to the panel light valve and the entrance / exit surface of the prism so that the image quality of the projected image is not impaired. Is necessary. Large projection display devices with high brightness have a projection lens shift mechanism that finely adjusts the projected image position by moving the projection lens up and down and left and right relative to the panel light valve. A method of adjusting the tilt of the optical axis of the projection lens by moving the entire mechanism is adopted.
[0003]
[Problems to be solved by the invention]
However, this type of projection display device is required to have high brightness, high image quality, high functionality, and a small set size. As in the past, the optical axis of the projection lens is a panel light valve. If the entire projection lens shift mechanism is moved so as to be orthogonal to the incident / exit surface of the prism, the configuration of the entire apparatus becomes complicated, leading to problems such as an increase in cost and an increase in the size of the apparatus.
[0004]
SUMMARY OF THE INVENTION An object of the present invention is to provide a projection display device that can adjust the tilt of a projection lens without moving the entire projection lens shift mechanism and obtain high image quality.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention described in claim 1 is a panel-like light valve that is composed of a plurality of pixels and can be modulated for each pixel according to information, and irradiates the light valve with a light beam from a light source. Projection-type display device having illumination optical means, a projection lens for enlarging and projecting the image of the light valve on a screen, and a projection lens mount having the projection lens and a plurality of screw holes and a plurality of mounting holes In the projection lens mount, a flange of the projection lens in which a plurality of attachment holes for attachment to the projection lens mount are formed, an adjustment plate disposed between the projection lens mount and the flange, and the projection lens mount attached to the projection lens mount. Adjustment plate urging means for urging the adjustment plate in the direction of the lens mount, and a plurality of screws that are screwed into the screw holes of the projection lens mount An adjustment screw, a plurality of adjustment plate attachment members that engage with the adjustment plate and the adjustment plate urging means, an attachment hole of the flange and an attachment hole of the projection lens mount, and the projection lens mounted on the projection lens mount A plurality of projection lens mounting screws that hold the adjustment plate in an interposed state, and the adjustment plate includes a screw contact surface that abuts the head of the adjustment screw on the projection lens flange side, and A through hole into which a tool for adjusting the adjusting screw is inserted and a through hole into which the adjusting plate mounting member is engaged are configured.
[0006]
According to a second aspect of the present invention, there is provided a panel-like light valve that is composed of a plurality of pixels and can be modulated for each pixel according to information, illumination optical means for irradiating the light valve with a light beam from a light source, and the light valve a plurality of attachment of a projection lens, the projection display device and a projection lens mount having a plurality of mounting holes and mounting the projection lens, for attachment to the projection lens mount for enlarging and projecting the image on a screen A flange of the projection lens in which a hole is formed , an adjustment plate having a plurality of screw holes disposed between the projection lens mount and the flange, and the flange attached to the adjustment plate in the direction of the lens mount. Adjusting plate biasing means for biasing, a plurality of adjusting screws screwed into screw holes of the adjusting plate, the flange and the adjusting plate biasing hand A plurality of adjustment plate attachment members that engage with the projection lens mount, and a plurality of adjustment plate attachment members that are disposed in the attachment holes of the flange and the projection lens mount and hold the projection lens with the adjustment plate interposed with respect to the projection lens mount. A projection lens mounting screw, and the flange includes a through hole into which a tool for adjusting the adjustment screw is inserted, a through hole with which the adjustment plate mounting member is engaged, and the adjustment plate side on the adjustment plate side. The adjustment screw has a screw contact surface with which the head of the adjustment screw abuts .
[0007]
According to each configuration described above, the inclination of the projection lens can be adjusted by slightly changing the mounting portion of the projection lens and adding components, and high image quality can be obtained.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
(Embodiment 1)
1 is a perspective view showing a schematic overall configuration of a projection display apparatus according to Embodiment 1 of the present invention, FIG. 2 is an exploded perspective view of a projection lens mounting portion of the projection display apparatus, and FIG. 3 is the projection display apparatus. It is a partially expanded sectional view of the projection lens attachment part of FIG.
[0009]
As shown in FIG. 1, the projection display apparatus includes a projection lens 1 for enlarging and projecting an image on a screen outside the apparatus, and a projection that can adjust the shift of the optical axis shift and the focus direction by mounting the projection lens 1. The lens mount 2, the liquid crystal panel 3 (3R, 3G, 3B) as a light valve capable of modulating light transmission or shading for each pixel according to information, and these liquid crystal panels 3 (3R, 3G, 3B) ), And recombines the light transmitted through the projection lens 1 in the direction of the projection lens 1, and optical components such as several types of dichroic mirrors that separate the white light of the lamp 5 as the light source. 3R, 3G, and 3B) are provided with illumination optical devices 6 as illumination optical means for guiding light of colors corresponding to the respective entrance surfaces.
[0010]
With the above configuration, the white light from the lamp 5 is separated into red, green, and blue light beams by the plurality of optical elements of the illumination optical device 6, and is incident on the liquid crystal panels 3R, 3G, and 3B, respectively, according to the video signal. Modulation is performed for each pixel, whereby an image corresponding to red, green, and blue is displayed. The light beams of the respective colors modulated and transmitted by the liquid crystal panels 3R, 3G, and 3B are incident on the color combining prism 4 and combined, and are emitted from the surface in the direction of the projection lens 1. Light emitted from the color synthesis prism is taken into the projection lens 1, and a synthesized image of the images from the liquid crystal panels 3R, 3G, and 3B is enlarged and projected onto a screen outside the apparatus.
[0011]
Specifically, in the projection display apparatus, as shown in FIG. 2, the liquid crystal panels 3R, 3G, and 3B are accurately positioned and fixed with respect to the color combining prism 4. The projection lens mount 2 is also accurately positioned and fixed with respect to the color combining prism 4, and the projection lens 1 arranged concentrically inside is moved in each of the X direction, Y direction, and Z direction in the figure. A mechanism (not shown) for adjusting (lens shift and focus movement) is provided.
[0012]
The tilt adjustment mechanism of the projection lens 1 with respect to the color synthesis prism 4 includes a flange 7 of the projection lens 1, a projection lens mounting portion 8 formed in a bowl shape on the outer periphery of the projection lens mount 2, and a flange surface of the projection lens 1. one surface is disposed between the projection shooting lens mounting portion 8 of the flange 7 of the projection lens 1 so as to abut the projection lens mount 2, plate-shaped and ring-shaped adjustment plate 9 as a projection lens mounting member And three sets of parts arranged at 120 ° intervals with respect to the center of the optical axis, such as an urging means such as a screw and a leaf spring for mounting and adjusting these.
[0013]
This will be described in more detail with reference to FIG. 3 showing the superstructure in which a set of the above-mentioned parts is arranged.
Projecting shooting lens mounting portion 8 of the projection lens mount 2, without one side facing the adjusting plate 9 is a concave shape capable of receiving the adjusting plate 9, the inner peripheral portion of the other side of contradictory adjustment plate 9 along the axial direction The leaf spring 10 is attached to the outer periphery of the protruding portion.
[0014]
Through holes 7a, 9a, and 8a are coaxially formed in the flange 7, the adjustment plate 9, and the projection lens mounting portion 8 of the projection lens 1, and the through holes 8a therein are formed as screw holes. The through hole 9a of the adjustment plate 9 is formed such that the inner surface of the end facing the projection lens mounting portion 8 is formed as a cone-shaped contact surface 9a1, and the adjustment screw 11 whose head abuts against the cone-shaped contact surface 9a1 is formed in the screw hole 8a. The adjusting screw 11 is rotated by a tool inserted through the through-holes 7a and 9a and can be moved out and out.
[0015]
Further, through holes 9b and 8b are formed coaxially in the adjustment plate 9 and the projection lens mounting portion 8 on the outer peripheral side of the through holes 7a and 9a, respectively, and screws that are coaxial with the through holes 9b and 8b. A hole 10 b is formed in the leaf spring 10. The through hole 9b of the adjusting plate 9 is formed in a funnel shape having an open end facing the flange 7, and a countersunk screw 12 whose head is fitted into the funnel-shaped through hole 9b is inserted into the through holes 9b and 8b. The adjusting plate 9 is urged in the direction of the projection lens mounting portion 8 by being screwed into the screw hole 10 b of the leaf spring 10.
[0016]
Flange 7 of the projection lens 1, adjusting plate 9, each of the projection lens attachment portion 8 of the projection lens mount 2, three sets of mounting holes 7c, 9c, 8c are formed, the mounting screw 13 is arranged to be screwed thereto It has been, thereby, the projection lens 1 with respect to the projection lens mount 2, the adjustment plate 9 is held in a condition mediated.
[0017]
Since it has such a configuration, by adjusting the tightening or loosening of the adjusting screw 11 whose head is in contact with the screw contact surface 9a1 of the adjusting plate 9 through a tool through the through holes 7a and 9a at the time of inspection, The distance of the adjustment plate 9 with respect to the projection lens mounting portion 8 can be arbitrarily adjusted independently at the position of each adjustment screw 11, whereby the projection lens mounting portion 8 at the position of each adjustment screw 11 (here, three locations) can be adjusted. The inclination of the adjustment plate 9 determined by the distance can be finely adjusted. As a result, it is possible to finely adjust the inclination of the flange 7 of the projection lens 1 that is in close contact with the adjustment plate 9, and thus the inclination of the projection lens 1.
[0018]
Since the inclination of the projection lens 1 can be finely adjusted in this way, the optical axis of the projection lens 1 can be accurately orthogonal to the incident / exit surfaces of the liquid crystal panels 3R, 3G, 3B and the color synthesis prism 4. become. Thus, in this manner while the fine adjustment, by keeping fixed by attachment screws 13 to the projection lens 1 with respect to the projection lens mount 2, it is possible to obtain a good image quality.
[0019]
As shown in FIG. 4, the projection display device includes a projection lens 1, a projection lens mount 2, a liquid crystal panel 3 (3R, 3G, 3B) as a light valve, a color synthesis prism 4, and a light source. A lamp 5 and an illumination optical device 6 are provided.
[0020]
As shown in FIG. 5, the liquid crystal panels 3R, 3G, and 3B are accurately positioned and fixed with respect to the color synthesis prism 4. The projection lens mount 2 is also accurately positioned and fixed with respect to the color combining prism 4, and the projection lens 1 arranged concentrically inside is moved in each of the X direction, Y direction, and Z direction in the figure. A mechanism (not shown) for adjusting (lens shift and focus movement) is provided.
[0021]
Inclination adjustment mechanism of the projection lens 1 with respect to the color combining prism 4, the flange 7 of the projection lens 1, the light projecting shooting lens attachment portion 8 formed like a flange on the outer periphery of the end portion of the projection lens mount 2, a projection lens mount screws performing formed integrally on the outer periphery of the second end, a plate-shaped and ring-shaped adjustment plate 9 disposed between the flange 7 and the projection shooting lens mounting 8, these mounting and adjustment, the leaf spring 3 parts arranged at intervals of 120 ° with respect to the center of the optical axis, such as an urging means.
[0022]
This will be described in more detail with reference to FIG. 6 showing an upper structure in which a set of the above-mentioned parts is arranged.
Adjusting plate 9, one side facing the flange 7 of the projection lens 1 forms an end flush of the projection lens mount 2, the inner peripheral portion of the other side facing the projecting shooting lens mounting portion 8 in the axial direction The leaf spring 10 is attached to the outer periphery of the protruding portion.
[0023]
Through holes 7a, 9a, 8a are formed coaxially in the flange 7, adjustment plate 9 and projection lens mounting portion 8 of the projection lens 1, and the through holes 9a are formed as screw holes. In the through hole 7a of the flange 7, the inner surface of the end facing the adjustment plate 9 is formed as a cone-shaped contact surface 7a1, and the adjustment screw 11 whose head abuts against the cone-shaped contact surface 7a1 is screwed into the screw hole 9a. The adjusting screw 11 is rotated by a tool inserted through the through hole 7a and can be moved out and out.
[0024]
Further, through holes 7b and 9b are formed coaxially in the flange 7 on the outer peripheral side of the through holes 7a and 9a and the thin portion of the adjusting plate 9, respectively, and screws that are coaxial with these through holes 7b and 9b. A hole 10 b is formed in the leaf spring 10. Then, the screw 12A is inserted into the through holes 7b and 9b and screwed into the screw hole 10b of the leaf spring 10, whereby the flange 7 is biased in the direction of the adjustment plate 9 .
[0025]
Flange 7 of the projection lens 1, adjusting plate 9, each of the projection lens attachment portion 8 of the projection lens mount 2, three sets of mounting holes 7c, 9c, 8c are formed, the mounting screw 13 is arranged to be screwed thereto It has been, thereby, the projection lens 1 with respect to the projection lens mount 2, the adjustment plate 9 is held in a condition mediated.
[0026]
Since it has such a configuration, at the time of inspection, each adjustment screw 11 is adjusted by adjusting the tightening or loosening degree of each adjusting screw 11 whose head is in contact with the screw contact surface 7a1 of the flange 7 through the through hole 7a. The distance of the adjusting plate 9 to the flange 7 can be arbitrarily adjusted independently at the position of the screw 11, whereby the angle between the flange 7 and the adjusting plate 9 can be adjusted at the position of each adjusting screw 11 (here, three locations). Fine adjustment. As a result, it is possible to finely adjust the inclination of the projection lens 1 with respect to the projection lens mount 2 having an integral structure with the adjustment plate 9.
[0027]
Since the inclination of the projection lens 1 can be finely adjusted in this way, the optical axis of the projection lens 1 can be accurately orthogonal to the incident / exit surfaces of the liquid crystal panels 3R, 3G, 3B and the color synthesis prism 4. become. Thus, in this manner while the fine adjustment, by keeping fixed by attachment screws 13 to the projection lens 1 with respect to the projection lens mount 2, it is possible to obtain a good image quality.
[0028]
In the first and second embodiments described above, three liquid crystal panels 3R, 3G, and 3B are used as panel-like light valves, and white light is applied to these liquid crystal panels 3R, 3G, and 3B in advance in red, green, and blue. In this example, the color separation is performed separately and recombined after emission from the liquid crystal panels 3R, 3G, and 3B. However, the tilt adjustment described above is similarly applied to a projection display device that uses one liquid crystal panel. The mechanism can be applied. The same effect can be obtained by applying the tilt adjustment mechanism described above to a projection type display device that uses one or more mirror array elements in a panel-like light valve.
[0029]
【The invention's effect】
As described above, according to the present invention, the conventional projection lens shift mechanism is slightly changed, so that the projection lens shift mechanism is not moved and the panel-shaped light valve or the prism used for color separation / combination is used. It is possible to adjust the optical axis of the projection lens with respect to the light incident / exit surface, thereby absorbing variations in the accuracy of optical components and mechanical components and exhibiting good optical performance. Therefore, it is possible to avoid complication of the device configuration, enlargement of the device, and cost increase.
[Brief description of the drawings]
FIG. 1 is a plan view showing a schematic overall configuration of a projection display apparatus according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of a projection lens mounting portion of the projection display apparatus of FIG. FIG. 4 is a partially enlarged cross-sectional view of a projection lens mounting portion of the projection display apparatus of FIG. 4. FIG. 4 is a plan view showing a schematic overall configuration of the projection display apparatus in Embodiment 2 of the present invention. FIG. 6 is an exploded perspective view of the projection lens mounting portion of the apparatus. FIG. 6 is a partially enlarged cross-sectional view of the projection lens mounting portion of the projection display apparatus of FIG.
1 Projection lens 2 Projection lens mount
3R, 3G, 3B LCD panel 4 Color composition prism 5 Lamp 6 Illumination optical device 7 Flange 8 Projection lens mounting part 9 Adjustment plate
7a, 8a, 9a Through hole
7c, 8c, 9c Mounting hole 9a1 Screw contact surface
10 leaf spring
11 Adjustment screw
12 Countersunk screw
13 Mounting screw

Claims (2)

  1. A panel-like light valve composed of a plurality of pixels, which can be modulated for each pixel according to information, illumination optical means for irradiating the light valve with a light beam from a light source, and an image of the light valve being enlarged and projected onto a screen A projection display device comprising: a projection lens for mounting; and a projection lens mount mounted with the projection lens and having a plurality of screw holes and a plurality of mounting holes .
    A flange of the projection lens in which a plurality of attachment holes for attachment to the projection lens mount are formed;
    An adjustment plate disposed between the projection lens mount and the flange;
    Adjustment plate urging means attached to the projection lens mount and urging the adjustment plate in the direction of the lens mount;
    A plurality of adjustment screws screwed into the screw holes of the projection lens mount;
    A plurality of adjustment plate attachment members that engage with the adjustment plate and the adjustment plate urging means;
    A plurality of projection lens mounting screws disposed in the mounting holes of the flange and the mounting hole of the projection lens mount and holding the projection lens in a state where the adjusting plate is interposed with respect to the projection lens mount;
    With
    The adjustment plate includes a through hole into which a tool for adjusting the adjustment screw is inserted, a through hole with which the adjustment plate mounting member is engaged, and a head of the adjustment screw on the side facing the projection lens mount. A projection display device , comprising: a screw contact surface that abuts .
  2. A panel-like light valve composed of a plurality of pixels, which can be modulated for each pixel according to information, illumination optical means for irradiating the light valve with a light beam from a light source, and an image of the light valve being enlarged and projected onto a screen A projection display device having a projection lens for mounting and a projection lens mount having the projection lens and a plurality of mounting holes ,
    A flange of the projection lens in which a plurality of attachment holes for attachment to the projection lens mount are formed;
    An adjustment plate disposed between the projection lens mount and the flange and having a plurality of screw holes;
    Adjustment plate urging means attached to the adjustment plate and urging the flange toward the lens mount;
    A plurality of adjusting screws screwed into the screw holes of the adjusting plate;
    A plurality of adjustment plate attachment members that engage with the flange and the adjustment plate biasing means;
    A plurality of projection lens mounting screws disposed in the mounting holes of the flange and the mounting hole of the projection lens mount and holding the projection lens in a state where the adjusting plate is interposed with respect to the projection lens mount;
    With
    The flange includes a through hole into which a tool for adjusting the adjustment screw is inserted, a through hole with which the adjustment plate mounting member is engaged, and a head of the adjustment screw abutting on a side facing the adjustment plate. A projection display device having a screw contact surface .
JP2002158380A 2002-05-31 2002-05-31 Projection display Active JP4043293B2 (en)

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Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3702890B2 (en) 2003-10-06 2005-10-05 セイコーエプソン株式会社 Optical assembly and projector
JP4574463B2 (en) * 2005-06-15 2010-11-04 キヤノン株式会社 lens barrel
JP4172493B2 (en) 2006-04-10 2008-10-29 ソニー株式会社 Lens barrel and imaging device
JP5263002B2 (en) * 2009-05-29 2013-08-14 パナソニック株式会社 Lens mounting device
JP5614053B2 (en) * 2010-02-22 2014-10-29 セイコーエプソン株式会社 Projection lens device and projector
JP2012048177A (en) * 2010-08-30 2012-03-08 Fujifilm Corp Lens device
JP5696644B2 (en) 2011-11-04 2015-04-08 株式会社リコー Image display device
JP6191111B2 (en) 2012-09-28 2017-09-06 セイコーエプソン株式会社 projector
US8922883B2 (en) 2012-11-05 2014-12-30 Ricoh Company, Ltd. Magnification optical system
JP2015143861A (en) * 2015-02-12 2015-08-06 株式会社リコー Projection optical system and image display device
JP2017129711A (en) 2016-01-20 2017-07-27 Thk株式会社 Lens alignment device and projector including the same
JPWO2018135090A1 (en) * 2017-01-17 2019-11-07 Thk株式会社 Projector device

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