JP5447142B2 - Projection type image display system - Google Patents

Description

  The present invention relates to a projection-type image display system that displays an image by enlarging and projecting various types of image information on a projection surface.

  2. Description of the Related Art Projection type image display devices (projector devices and the like) that can obtain an enlarged image by projecting various types of image information onto a projection surface such as a screen are known. This projection-type image display device includes a light source, an image source such as a liquid crystal panel that projects an image forward by irradiation light from the light source, a projection lens that enlarges and forms a projection image from the image source, and a change in the projection image. A projection scaling mechanism that scales the projection size by adjusting the magnification, and a projection surface such as a screen that projects the projected image and displays it as necessary.

  A projection magnification change mechanism used in a conventional projection type image display device such as a liquid crystal projector is optically performed by a so-called zoom mechanism that is mounted on the projection lens side and optically changes the magnification ratio of the projection image. Yes. Further, the projection screen size can be changed by the user changing the interval between the projection type image display device and the projection surface.

In recent years, a wide-angle projection display apparatus as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2009-251204) has come to be used. This is a projection-type image display device that can obtain a large screen at a short distance by using a reflection-type mirror for the refraction-type lens and using a wide-angle projection lens by utilizing the large reflective refractive power of the mirror. .
In such a wide-angle projection display apparatus, the projected image is distorted due to the tilt of the apparatus and is wide-angle. Therefore, if the tilt of the apparatus is even a little, the degree of distortion of the image is significantly increased. Therefore, Patent Document 1 discloses a technique for adjusting the distance from the projection surface with four protruding pins.

  According to the wide-angle projection display apparatus disclosed in Patent Document 1, a plurality of rod-like protrusions housed in the main body case so as to protrude from the main body case toward the wall surface, and the protrusions are moved forward and backward. And a plurality of protrusions, each of which includes at least three protrusions so as to form a fixed plane by all the tip surfaces. In the case of installation, an initial set dimension set in the operation unit can be projected. With such a configuration, the projection surface is operated by operating the operation unit at the time of installation so that the projection protrudes by an initial set dimension, and the projection surface is installed so that the tip of the projection abuts the wall surface constituting the projection surface. Can be installed with the perpendicularity of the wall surface forming the projection optical axis as high as possible.

However, in the technique described in Patent Document 1, although the distance between the projection surface and the projection display apparatus is positioned by the protrusion, it is necessary to individually adjust the protrusion amount of the protrusion. In addition, the projection distance cannot be set longer than the length of the protrusion. That is, there is a problem that it cannot be set when it is desired to increase the projection distance.
Also, when setting the projection distance, it is conceivable that the user installs the display device against a wall or the like, but if the projection is set in advance to the specified projection amount, the device is placed on the wall or the like. When abutting, it will abut against a wall or the like, so when projecting, stress in the projection direction is applied to the projecting object, and the reaction may cause a change in the projecting amount of the projecting object. .
In other words, when the user installs the device in contact with a wall or the like, the projecting object is pushed in due to the inertia of the device due to the act of hitting the wall or the like to some extent, and the amount of protrusion is distorted. There are challenges.

Patent Document 2 (Japanese Unexamined Patent Application Publication No. 2009-69572) discloses a proximity or wide-angle projector device that has a projection surface and a projector, and is surely provided by a connecting member provided between the projection surface and the projector. An object of the present invention is to provide a projector device that is positioned perpendicular to the projection surface and that can easily adjust the projection image projected onto the projection surface by the connecting member. The connecting member is allowed to intersect at the front surface position of the projection surface, the connecting member is provided with a distance determining means, and the lower surface of the main body is further provided with a distance determining means receiving portion that fits the distance determining means, There is disclosed a projector apparatus including a projection distance control unit that determines a projection distance by a combination of the distance determination unit and the distance determination unit receiving unit.
However, in this projector device, a projector (projection device) is installed at the connection location of the connection member, and the projection distance can be adjusted by the connection angle of the connection member extending from the left and right ends of the projection surface. Since it is hold | maintained at one place of the intersection of a connection member, it cannot be said that a projection apparatus and a projection surface can be made parallel easily.

The present inventor can unambiguously set the projection distance by a simple mechanism by utilizing the fact that subtle changes in the installation position and angle of the projection device with respect to the projection surface such as a screen cause a large change in the screen size. In addition, a technique that minimizes lateral distortion was studied.
Here, a projection apparatus that projects an image size of 60 inches on the screen surface by projecting an image from a position 50 cm away from the screen surface will be considered. In the case of such a device, the slow ratio of the projection lens, that is, the projection distance / display screen width ratio is
60 × 2.54 / 120 = 0.41
The half angle of view is close to 70 degrees.
If it is an optical system that does not simply apply, but the slow ratio is maintained even if the projection distance changes, moving the installation position of the projection device 10 cm rearward along the projection direction,
(50cm + 10cm) /0.41
From this calculation, the image size is equivalent to 72 inches.
That is, it can be seen that the screen size is changed by nearly 20% for 60 inches.
In other words, it can be seen that there is an effect equivalent to a 1.2 × zoom by adjusting the projection distance of only 10 cm. As the projection lens has a shorter focal length, that is, a smaller slow ratio, the rate of change in the screen size depending on the installation location of the projection apparatus becomes more prominent.

The present invention makes it possible to easily position a distance from a display surface such as a wall in a projection apparatus having such a slow ratio of 1 to less than 0.5, and to accurately position the parallelism with the wall. It is something that can be done.
Taking a projection lens with a half angle of view of 70 degrees as an example, the projection distance changes by 10 mm on the left and right.
10 mm x tan 70 ° = 27.47477 ... mm
Therefore, a positional deviation of 27 mm or more occurs on the left and right.

In this way, in addition to the screen size, there is a phenomenon that the display position changes greatly only by changing the distance from the display screen by 1 cm on the left and right. Normally, since the screen is continuous, it is not rectangular and is displayed as a trapezoid with different magnifications on the left and right.
In these phenomena, as the focal point becomes shorter, that is, as the projection angle of view becomes larger, the distortion becomes more conspicuous with a slight change in the distance and parallelism of the projection device from the screen.
Conversely, if a mechanism capable of slightly adjusting the angle of light projected onto the screen is provided, the screen size is greatly changed and the size adjustment amount is also increased.

  There are also projection devices that can correct the trapezoidal distortion in the vertical direction by adjusting the image processing, and projection devices that can correct the horizontal distortion caused by the projection from the oblique horizontal direction. In a small projection device, it is considered that a method of moving and rotating the projection device main body is quicker and more effective than a correction method by image processing such as fine adjustment of the correction means.

The present invention has been made in view of the above circumstances, and the distance between the projection device and the display position (projection surface) of the projection image projected by the projection device, that is, the projection distance can be easily achieved by a very simple mechanism and configuration. It is an object of the present invention to provide a projection type image display system that can be installed in a projector and can be finely adjusted.
In addition, regarding the parallelism between the projection surface (screen, wall surface, etc.) serving as the display position and the projection device, the projection distance is set, and at the same time, the lateral magnification error can be accurately positioned so as to be minimized. It is an object of the present invention to provide a projection type image display system having a structure that can be used.
Furthermore, even when the device is pressed against a projection surface such as a wall at the time of device installation, there is a mechanism in which the distance between the wall surface (projection surface) and the projection device does not get out of order and the projection distance direction does not easily shift. It is an object of the present invention to provide a projection-type image display system that can provide a projection image without distortion.

As means for solving the above problems, the present invention has the technical features described in the following [1] to [12].
[1]: In a projection-type image display system that displays an image formed by enlarging and projecting an image formed by an image forming unit in accordance with image information on a projection surface, “at least a short side that is a short direction of the projected image An image forming unit that forms images having long sides in the longitudinal direction and having different vertical and horizontal lengths, a first optical system composed of lenses, and directing projection light from the first optical system toward the projection surface A projection optical system that enlarges and projects an image formed by the image forming unit, and a case that covers the projection optical system and the image forming unit And a “projection distance setting means for determining a projection distance that is an interval between the projection surface and the projection apparatus”, and “the projection distance setting means has a variable angle”. A set of two rigid members connected to each other Each of the projection distance setting mechanisms is supported by the projection device so that the connecting portion angle of the two rigid members can be varied, and the connecting portions of the two rigid members The tip is projected from the projection device by changing the angle in the short direction of the projection image, and the projection of the projection distance setting mechanism is projected from the projection device. At least two locations are provided in the longitudinal direction of the image ”(claim 1).

[2]: In the projection type image display system according to [1], at least two projection distance setting mechanisms of the projection distance setting means are connected by an interlocking member (claim 2).

[3]: In the projection type image display system according to [2], the interlocking member is located at a distal end portion of the projection distance setting mechanism protruding from the projection device (claim 3).

[4]: In the projection type image display system according to [1], an interval between a connection portion of the rigid member of the projection distance setting mechanism and a support portion supported on the projection device side is T1, and the projection device T1 <T2 when the distance between the tip projecting from the projection and the support part supported on the projection device side is T2 (claim 4).

[5]: In the projection type image display system according to [1], an interval between a tip portion protruding from the projection device of the projection distance setting mechanism and a support portion supported on the projection device side is T2. In this case, the T2 is made larger than the depth D in the projection direction of the projection device (claim 5).

[6]: In the projection type image display system according to [1], the rigid member having a tip portion protruding from the projection device of the projection distance setting mechanism is a plate-like member in which an interlocking member is integrated. And one side of the plate-like member is a tip portion protruding from the projection device (claim 6).

[7]: In the projection type image display system according to [6], the rigid member having a tip protruding from the projection device of the projection distance setting mechanism emits the projection light from the projection opening at the time of non-projection. It also serves as an opening cap so as to block (claim 7).

[8]: In the projection type image display system according to any one of [1] to [7], the projection distance setting mechanism further protrudes toward a projection direction at a tip portion protruding from the projection device. A second projecting member is provided (claim 8).

[9]: In the projection type image display system according to [8], the amount of protrusion of the second protruding member can be adjusted (claim 9).

[10]: The projection type image display system according to [1], wherein the projection distance setting means is provided in two stages in a short direction of the projection image (claim 10).

[11]: In the projection type image display system according to any one of [1] to [10], the projection distance of the projection distance setting unit according to a prescribed projection size or a prescribed projection distance A guide function is provided so that the protruding amount of the setting mechanism can be set (claim 11).

[12]: The projection type image display system according to [11], wherein the projection optical system is automatically focused in conjunction with the guide function (claim 12).

  In the projection type image display system according to [1] of the solving means, the projection distance setting means has two or more projection distance setting mechanisms composed of a set of two rigid members connected to be variable in angle. The projection distance setting mechanism is supported by the projection device so that the connecting portion angle of the two rigid members can be varied, and the tip of the projection device is changed by changing the connecting portion angle of the two rigid members in the short direction of the projected image. The projection distance setting means is configured such that at least two locations where the tip of the projection distance setting mechanism protrudes from the projection device are provided in the longitudinal direction of the projection image. The projection device can be easily installed at an appropriate projection distance by placing the tip portions of two or more projection distance setting mechanisms constituting the projector against a projection surface such as a wall or a screen. It can be a distortion in the longitudinal direction (lateral direction) of the minimum.

  In the projection type image display system according to [2], in addition to the effect of [1], at least two projection distance setting mechanisms of the projection distance setting means are connected by an interlocking member, so one projection distance setting mechanism By moving the rigid member, the rigid member of the other projection distance setting mechanism can be moved in conjunction with each other, and the two projection distance setting mechanisms provided in the longitudinal direction of the projection device and the projection surface The interval (projection distance) can be set accurately.

  In the projection type image display system according to [3], in addition to the effect of [2], the interlocking member is positioned at a tip portion of the projection distance setting mechanism protruding from the projection device, whereby the two projection distance setting mechanisms. Since the distal end portions are connected to each other by the interlocking member and become linear, it is easy to position the distal end portions at both ends.

  In the projection type image display system according to [4], in addition to the effect of [1], the interval between the connecting portion of the rigid member of the projection distance setting mechanism and the support portion supported on the projection device side is T1, and the projection device When the distance between the tip portion protruding from the support portion and the support portion supported on the projection apparatus side is T2, the position is set to T1 <T2, and thus a wider projection distance setting range can be obtained.

  In the projection type image display system according to [5], in addition to the effect of [1], the interval between the tip portion protruding from the projection device of the projection distance setting mechanism and the support portion supported on the projection device side is T2. Then, since T2 is larger than the depth D in the projection direction of the projection apparatus, a longer projection distance setting range can be obtained with respect to the depth of the apparatus.

  In the projection type image display system according to [6], in addition to the effect of [1], the rigid member having a tip portion protruding from the projection device of the projection distance setting mechanism is a plate-like shape in which an interlocking member is integrated. This is a member, and one side of the plate-like member is a tip that protrudes from the projection device, so that the tip has a rigidity that can sufficiently withstand contact pressure even when the tip contacts a hard projection surface such as a wall. Therefore, the tip portion can be prevented from being deformed and positioned at an accurate projection distance.

  In the projection type image display system according to [7], in addition to the effect of [6], the rigid member having the tip protruding from the projection device of the projection distance setting mechanism projects from the projection opening when not projecting. Since it also serves as an opening cap so as to block light, it is possible to prevent dust from entering.

  In the projection type image display system according to [8] and [9], in addition to the effect of any one of [1] to [7], a projection direction is further provided at a tip portion protruding from the projection device of the projection distance setting mechanism. Since the second projecting member that projects toward the screen is provided, even if there is a projection on the projection surface such as a wall or screen for projecting an image, the parallelism with the projection surface can be maintained, and the tip and Even if the parallelism is out of order due to unevenness in the position of contact with the projection surface, the second projecting member can adjust the projecting amount, so that the parallelism can be adjusted.

  In the projection type image display system according to [10], in addition to the effect of [1], the projection distance setting means is provided in two stages in the short direction of the projection image. It can also be used as a leg portion, and the application range of the projection device such as a desktop projection can be expanded.

  In the projection type image display system according to [11], in addition to the effect of any one of [1] to [10], the projection distance of the projection distance setting unit is determined according to a prescribed projection size or a prescribed projection distance. Since the guide function is provided so that the protruding amount of the setting mechanism can be set, a necessary projection size can be easily set.

  In the projection type image display system according to [12], in addition to the effect of [11], the projection optical system is automatically focused in conjunction with the guide function, so that the focus is set according to the set projection size. Matching can be performed automatically.

It is a figure which shows the whole system structure of the projection type image display system which concerns on 1st Example of this invention, and is sectional drawing when it sees from the horizontal direction parallel to a projection surface. FIG. 2 is a cross-sectional view of the projection type image display system shown in FIG. 1 when viewed from a direction facing (perpendicular to) the projection surface. It is a figure when the principal part (part of a projection distance setting means) of the projection type image display system shown in FIG. 1 is seen from the side, and description of a structure and operation | movement of one projection distance setting mechanism which comprises a projection distance setting means. FIG. It is a figure when the projection apparatus and projection distance setting means of the projection type image display system shown in FIG. 1 are seen from the projection surface side. It is the figure which plotted the protrusion amount (D) by setting the space | interval (H) of a fulcrum center and a movable part center as a horizontal axis about the projection distance setting mechanism of three types (A, B, C) from which the length of an arm differs. (A) is sectional drawing when a projection type image display system is seen from the horizontal direction parallel to a projection surface like FIG. 1, (b) protrudes the front-end | tip part of the projection distance setting mechanism of a projection distance setting means. It is sectional drawing which shows the state made to do. (C) is a top view of the projection apparatus and projection distance setting means when the projection type image display system of FIG. 6 (a) is viewed from above, and (d) is a top view of the projection type image display system of FIG. 6 (b). It is a top view of a projection device and a projection distance setting means when viewed from above. It is a schematic perspective view which shows an example of the structure of the movable part (handle part) provided in the projection distance setting mechanism of the projection distance setting means. It is a figure which shows an example of the mechanism and operation | movement by which the movable part (handle part) shown in FIG. 8 is fixed in the guide part of a case, and is principal part sectional drawing of the guide part seen from the upper part of the projection apparatus. It is a figure when the principal part (part of a projection distance setting means) of a projection type image display system is seen from the side, and the lengths of two rigid members of the projection distance setting mechanism constituting the projection distance setting means are different. It is explanatory drawing of a structure and operation | movement. It is a figure which shows an example of the whole system structure of the projection type image display system which concerns on the 2nd Example of this invention, and is sectional drawing when it sees from the horizontal direction parallel to a projection surface. It is a figure which shows another example of the whole system configuration | structure of the projection type image display system which concerns on the 2nd Example of this invention, and is sectional drawing when it sees from the horizontal direction parallel to a projection surface. It is a figure which shows another structural example of the projection type image display system which concerns on the 2nd Example of this invention, and is explanatory drawing of a structure and operation | movement of one projection distance setting mechanism which comprises a projection distance setting means. It is explanatory drawing of a structure and operation | movement of the projection distance setting means of the projection type image display system which concerns on the 3rd Example of this invention. It is explanatory drawing of a structure and operation | movement of the projection distance setting means of the projection type image display system which concerns on 4th Example of this invention, (a) is a cross section when seeing a projection distance setting means and a projection apparatus from a horizontal direction FIG. 4B is a top view when the projection distance setting means and the projection device are viewed from above. It is a figure when the principal part (part of 2 steps | paragraphs of projection distance setting means) of the projection type image display system which concerns on 5th Example of this invention is seen from the side, The structure of 2 steps | paragraphs of projection distance setting means, It is explanatory drawing of operation | movement. It is a figure which shows the example of installation in the case of using the projection apparatus of the projection type image display system shown in FIG. It is a figure when the principal part (part of a projection distance setting means) of the projection type image display system concerning a 6th example of the present invention is seen from the side, and is an explanatory view of composition and operation in the case of having a guide function. is there.

Hereinafter, embodiments of the present invention will be described in detail.
First, the usage form of the projection type image display system according to the present invention, the assumption of the installation surface and the projection surface will be described.

[Assumption 1]
As is the case with many conventional projection type image display devices (so-called projector devices), a surface having appropriate flatness is used as a projection surface, and it is installed on a surface orthogonal to the projection surface. Assumed.
Specifically, the projection surface is a wall surface, and the surface perpendicular to the wall surface is a floor surface, a desk surface horizontal to the floor surface, a projection device installation table, or the like.
In addition, as the projection surface, a white board, a partition, a wall surface of a building, a screen suspended from above, and the like are assumed, but the projection surface itself or a holding member that sets the position of the projection surface, etc. It is assumed that it has rigidity.

[Assumption 2]
When the projection image display device is installed on the projection surface itself or on a plane parallel to the projection surface, and the projection surface is horizontal. Also at this time, the projection surface or a surface parallel to the projection surface has rigidity.
However, the above assumptions are assumptions for explaining the following embodiments of the present invention, and the present invention is not limited to these assumptions.

  Hereinafter, specific embodiments of the present invention will be described in detail with reference to the drawings.

[Example 1]
FIG. 1 shows an overall system configuration of a projection type image display system according to the present invention. FIG. 1 is a cross-sectional view of a projection type image display system as viewed from the lateral direction parallel to the projection surface. The projection type image display system includes an interface unit 14 that receives a signal from an external input device 15, an interface The control unit 13 that processes image information received from the unit 14, the light source 501, the illumination optical system 5 that guides the light from the light source 501 to the image forming unit, the image forming unit (image display panel) 10, and the image forming unit A projection optical system (first optical system 6 and second optical system (mirror) 9) for enlarging and projecting the formed image, and a case 7 that integrally holds the above components and optical system and covers them. Projection distance setting means for determining the distance (projection distance) between the projection surface 1 and the projection device 4 that is disposed between the projection device 4 and the projection surface 1. 3 ” To have.

  An image forming unit (image display panel) 10 is an image forming unit that forms an image having a short side that is a short side of a projected image and a long side that is a long side, and has different vertical and horizontal lengths. Have different aspect ratios. Usually, the image has a horizontally long aspect ratio, and forms (displays) a horizontally long image having a horizontal: vertical ratio of 4: 3 or 16: 9.

  The projection distance setting means 3 has a configuration having two or more projection distance setting mechanisms each composed of a set of two rigid members (for example, rigid members such as an arm shape and a plate shape) that are variably connected to each other. The setting mechanism is supported by the projection device 4 so that the connecting portion angle between the two rigid members can be varied, and the tip portion from the projecting device 4 is changed by changing the connecting portion angle between the two rigid members in the short direction of the projection image. Are projected, and at least two locations where the tip of the projection distance setting mechanism projects from the projection device 4 are provided in the longitudinal direction of the projection image.

In FIG. 1, the direction perpendicular to the paper surface (x direction) is the longitudinal direction of the projected image, and the vertical direction of the paper surface (y direction) is the short direction of the projected image.
FIG. 2 is a cross-sectional view of the projection type image display system shown in FIG. 1 when viewed from the direction facing (orthogonal) the projection surface. The horizontal direction (x direction) of the paper surface is the longitudinal direction of the projection image, and the paper surface. Is the short direction of the projected image.
Also in the present embodiment and other embodiments described later, unless otherwise specified, the projected image projected on the projection surface 1 is horizontally long, and the apparatus horizontal direction is the longitudinal direction. The ratio of the projected image also has a horizontally long aspect ratio in the horizontal direction, as in the image forming unit, and the horizontal: vertical ratio is 4: 3 or 16: 9.

As the light source 501, an ultra-high pressure mercury lamp, a xenon lamp, an LED (light emitting diode), an LD (laser diode), or the like is used, and the illumination light is directed in one direction by a reflector or the like as necessary.
As shown in FIGS. 1 and 2, the illumination optical system 5 includes a light source (for example, a lamp light source) 501, a color filter 502, a light tunnel 504, and a lens 505 (at least one) that collects a light beam emitted from the light tunnel. And an illumination light folding mirror (first illumination light folding mirror 506, second illumination light folding mirror 503), and the like.

  The image forming unit 10 is an image display panel configured with a so-called light valve. As an example, whether or not the two-dimensional array of minute mirrors serving as pixels is inclined and directed toward the projection lens. A DMD (Digital Mirror Device) panel manufactured by Texas Instruments, etc., which controls the light by the control unit 13 is suitable. In addition, an image display panel such as a liquid crystal light valve can also be used.

  As shown in FIG. 1, the magnifying projection optical system is a second optical system composed of a first optical system 6 composed of a plurality of lenses and a mirror having a power (concave mirror, parabolic mirror, aspherical mirror, etc.). The optical system 9 is configured and the shape is optimized so as to obtain a desired projection performance. An optical system using a mirror as the optical element closest to the projection surface has a very high reflective refractive power, and therefore it is easier to obtain a super-wide angle than an enlargement projection system composed only of a lens system.

  Although not necessarily a constituent feature of the present invention, image information from, for example, a personal computer as the external input device 15 is received by the control unit 13 via the interface unit 14 in the device, and image formation is performed according to the image information. The unit (for example, DMD panel) 10 is driven. The control unit 13 controls driving of a lamp or the like as the light source 501 and rotates the disk type color filter 502 in accordance with color information to perform color switching or the like.

The illumination light is guided to the image forming unit (for example, DMD panel) 10 by the illumination optical system 5, and the reflected light is projected to a desired projection position by the enlarged projection optical system (first optical system 6 and second optical system 9). A projected image (projected image) is displayed by enlarging and projecting onto the projection surface (screen surface, wall surface, desk surface, etc.).
The projection light is emitted from an opening 8 provided in a part of the case 7 of the projection device 4. As the opening 8, a window having a required opening width may be provided in the case 7, or a transparent cover may be provided so that dust does not enter the window.

  As described above, the projection distance setting means 3 is configured to have two or more projection distance setting mechanisms composed of a set of two rigid members (for example, arm-shaped rigid members) that are connected to be variable in angle. The distance setting mechanism is supported by the projection device 4 so that the connecting portion angle between the two rigid members can be varied, and the distal end from the projecting device 4 is changed by changing the connecting portion angle between the two rigid members in the short direction of the projection image. It is comprised so that a part may protrude. Further, at least two locations where the tip of the projection distance setting mechanism protrudes from the projection device 4 are provided in the longitudinal direction (device lateral direction) of the projection image.

Next, the projection distance setting means 3 will be described in detail with reference to FIGS.
FIG. 3 is a view of the main part (projection apparatus and projection distance setting means) of the projection-type image display system as seen from the side, as in FIG. 1, and shows one projection distance setting mechanism of the projection distance setting means. It is explanatory drawing of a structure and operation | movement. FIG. 4 is a view when the projection device and the projection distance setting means are viewed from the projection surface side.
One projection distance setting mechanism constituting the projection distance setting means 3 includes at least two arm-like rigid members 302 and 303 supported at one end side to the case 7 of the projection device 4. The angle can be changed, and the direction in which the angle can be changed is the short side direction of the screen (the vertical direction (y direction) in FIG. 3).

  More specifically, as shown in FIG. 3, the first arm 302 and the second arm 303 constituting the projection distance setting mechanism are arm-shaped rigid members, and one end side of the first arm 302 and the second arm 303. Are connected by a connecting portion 305 so that the angle can be varied. The other end of the first arm 302 is fixedly supported by the case 7 of the projection device 4 at a fulcrum 304 so as to be swingable. On the other hand, a handle portion (movable portion) 306 is provided on the other end side of the second arm 303, and this portion is movable by a vertically extending groove-shaped guide portion 307 provided on the side surface of the case 7 of the projection device 4. It is supported so that it can move up and down along the guide portion 307. Also, a projection distance setting mechanism is provided symmetrically on the side surface of the projection device 4 opposite to the case 7, and the third arm 3022 and the fourth arm 3032 are supported by the projection device 4 with the same configuration. .

  As described above, the projection distance setting mechanism constituting the projection distance setting unit 3 is installed at least two places in the longitudinal direction (lateral direction) of the enlarged projection image with the projection apparatus 4 interposed therebetween. The projection distance is set so as to be interposed therebetween, and the positions thereof are in the longitudinal direction of the display screen of the projection surface 1 and on both ends in the left-right direction of the projection device 4 as shown in FIG.

Moreover, as shown in FIG. 4, the front-end | tip part (1st front-end | tip part, 2nd front-end | tip part) of the projection distance setting mechanism protruded from the projection apparatus 4 is set to at least 2 places in the longitudinal direction of a projection image. .
The distance between the case 7 and the arm connecting portion 305 can be changed and adjusted so that the line connecting the two tip portions is substantially parallel to the horizontal direction of the projection image.

In the examples of FIGS. 3 and 4, the lengths of the two arms (rigid members) constituting each projection distance setting mechanism are the same, and the tips are connected to each other, as shown in FIG. In addition, the connecting portion of the two arms is the tip of each projection distance setting mechanism. Thus, by using the tip of each projection distance setting mechanism as a connecting portion of two arms, the rigidity is increased, and there is an advantage that deformation or the like is difficult to occur when abutting against the projection surface.
In addition, when setting the projection distance, at least the end of each arm (rigid member) on the side of the connecting portion is rounded so that the tip (arm connecting portion) of each projection distance setting mechanism abuts the projection surface. The projection surface is not damaged.

The two projection distance setting mechanisms of the projection distance setting means 3 provided on both sides of the projection device 4 are connected by a long plate-like interlocking member 301 extending in the longitudinal direction (lateral direction) of the projection image, If the handle portion (movable portion) 306 provided in one projection distance setting mechanism is moved up and down along the guide portion 307 to change the arm connecting portion angle, the arm connecting portion angle of the other projection distance setting mechanism is also changed. It is designed to change in conjunction with it. The interlocking member 301 that connects the two projection distance setting mechanisms is provided in the vicinity of the tip of each projection distance setting mechanism (the connecting part 305 in the example of FIG. 3). You may connect a front-end | tip part (connection part) with an interlocking member. When the interlocking member is located at the tip of the two projection distance setting mechanisms protruding from the projection device, the tip of the two projection distance setting mechanisms is connected by the interlocking member to become a linear shape. It becomes easy to position the part.
When the two projection distance setting mechanisms on both sides of the projection device 4 are connected by the interlocking member 301 as described above, the connecting portion angle of the two arms is set to approximately 180 degrees as shown in FIG. In this case (that is, when the leading end of each projection distance setting mechanism is retracted to the projection device side), the interlocking member 301 hits the case 7 of the projection device 4, so that the case 7 has a longitudinal direction (lateral direction) of the projection image. ) Of the interlocking member in the shape of a concave groove extending to).

Next, FIG. 5 shows a projection amount (D) with respect to three types (A, B, C) of projection distance setting mechanisms having different arm lengths, with the distance (H) between the fulcrum center and the movable part center as the horizontal axis. FIG. The length of the arm was the center of the movable part and the center of the connecting part, or the center of the connecting part and the center of the fulcrum. As a premise, the first arm 302 and the second arm 303 are assumed to have the same length.
The curve of A is when the length of the arm (the center distance between the movable part and the connecting part, or the center distance between the connecting part and the fulcrum) is 50 mm, B is 100 mm, and C is 200 mm. is there.
The curve C will be described. Since the length of the arm is 200 mm, when the distance (H) between the center of the fulcrum and the center of the movable portion is 400 mm, the two arms in FIG. In this case, the protrusion amount (D) is d0 = 0 mm. Note that the protrusion amount is not from the outer shape of the projection apparatus, but between the fulcrum center and the connection part center.

6 and 7 show a state in which the projection distance (distance between the projection device 4 and the projection surface 1) is changed by operating the projection distance setting means 3. FIG.
6A is a cross-sectional view of the projection-type image display system as viewed from the horizontal direction parallel to the projection surface, as in FIG. 1, and FIG. 6B is the tip of the projection distance setting mechanism of the projection distance setting means. It is sectional drawing which shows the state which made the part protrude. 7C is a top view of the projection apparatus and projection distance setting means when the projection type image display system of FIG. 6A is viewed from above, and FIG. 7D is the projection type of FIG. 6B. It is a top view of a projection device and a projection distance setting unit when the image display system is viewed from above.
As shown in FIGS. 6A and 7C, the angle formed by the connecting portion of the two arm sets of each projection distance setting mechanism of the projection distance setting means 3 is 180 degrees (FIG. 3 ( The state of a)), the projection device 4 can be arranged at the shortest projection distance.
Further, as shown in FIGS. 6B and 7D, the movable part (handle part) 306 provided in one projection distance setting mechanism of the projection distance setting means 3 is pulled upward along the guide part. As a result (the states of FIGS. 3B and 3C), the connecting portion 305 of the projection distance setting mechanism of the projection distance setting means 3 protrudes from the case 7 to become a tip portion. Positioning can be performed with the projection surface 1 of the member 2.
That is, the user of the projection device 4 brings the movable portion (handle portion) 306 provided in the projection distance setting means 3 to a necessary position, so that the distance between the projection device 4 and the projection surface 1 of the screen member 2 is reached. Can be arbitrarily set within a predetermined range determined by the length of the arm.

FIG. 8 is a schematic perspective view showing an example of the structure of the movable part (handle part) 306 provided in the projection distance setting mechanism of the projection distance setting means 3, and FIGS. 9A and 9B show the movable part. It is a figure which shows an example of the mechanism and operation | movement by which the (handle part) 306 is fixed within the guide part 307 of case 7, and is principal part sectional drawing of the guide part seen from the upper part of the projection apparatus.
A screw is cut at the tip of the handle portion 306 (inside the guide portion), and two stoppers (a first stopper 3061 and a second stopper 3062) are provided. The first stopper 3061 is attached to the tip of the handle portion 306 (inside the guide portion), and the second stopper 3062 is attached to the first stopper 3061 at a constant interval. The second stopper 3062 is provided with a screw hole (through) corresponding to the thread of the handle portion 306.
Here, the two stoppers 3061 and 3062 are incorporated in the guide portion 307 of the case 7.

  The user of the projection device 4 moves the handle part (movable part) 306 provided in the projection distance setting mechanism of the projection distance setting means 3 to a necessary position, and rotates the handle part 306 to thereby provide two stoppers. The intervals of 3061 and 3062 are separated and are fixed by friction with the side surface inside the guide portion 307. Since the stopper is not rotationally symmetric, it has a structure that does not rotate in the guide portion 307. Therefore, by rotating the handle portion 306, the distance between the two stoppers 3061 and 3062 can be adjusted.

  In addition, regarding the fixing method of the handle part 306, various structures are employable. For example, the wall surface of the guide portion 307 may be disposed between two stoppers 3061 and 3062 and fixed by being sandwiched between the two stoppers 3061 and 3062. Further, a spring structure may be used instead of the screw structure. The above structure of the stopper is an example, and does not limit the gist of the present invention.

The vicinity of the tip of the two projection distance setting mechanisms of the projection distance setting means 3 provided on the left and right sides of the projection device 4 is connected by an interlocking member 301 as shown in FIGS. Since the projection amount is set to be the same amount, the projection distance can be uniquely secured by installing the projection device 4 by pressing the tip of the projection distance setting means 3 against the screen surface. Moreover, since the protrusion amount is the same amount, the left-right direction of the projection screen and the left-right direction of the projection device 4 can be substantially parallel.
Therefore, the user can display with no distortion in the left-right direction by simply placing it on the screen surface and projecting it.

As shown in FIGS. 3, 6, and 7, the protruding directions of the tip portions (the connecting portions of the two arms) of the two projection distance setting mechanisms of the projection distance setting means 3 coincide with the projection distance direction. In order to determine the amount, the movable portion (handle portion) 306 provided in the projection distance setting means 3 can be lifted and the movable portion can be fixed and uniquely set. It is one of the unprecedented features of the present invention that the protruding direction is the z direction in FIG. 3, the adjustment movable direction is the y direction, and the two are orthogonal to each other.
With such a configuration, when the user hits the projection device 4 against a wall or the like, the stress in the direction in which the projection distance changes is in the z direction, but in the y direction which is the adjustment direction, the impact is a hit. It is difficult to apply the generated stress. For this reason, the projection distance is not easily changed.

  Of course, the projection image by the projection type image display system of the present invention is obtained in the horizontal direction when the outer shape of the projection device 4, that is, the outer shape of the case 7 in the present invention is at least parallel to the screen surface. It is premised on that the projection system is designed so that the difference in magnification is minimized. Since a normal projection apparatus (projector) obtains a projection image parallel to the outer shape unless otherwise intended, the optical system of the projection apparatus of the present invention should have the same reference as the normal projection apparatus. ing.

Here, it is more convenient that the first arm 302 and the third arm 3022 made of a rigid member of the projection distance setting mechanism provided on both sides of the projection device 4 are connected by the interlocking member 301 described above.
With such a configuration, by sliding up and down the movable portion 306 that is a handle portion, the first arm is moved from the case 7 to the first arm according to the angle of the connecting portion 305 where the first arm 302 and the second arm 303 are connected. 302 protrudes and the distance between the case 7 and the arm connecting portion 305 changes. Further, since the first arm 302 and the third arm 3022 are connected by the interlocking member 301, the third arm 3022 behaves the same as the first arm 302.

The interlocking member 301 is connected so that the first arm 302 of the projection distance setting mechanism provided on both sides of the projection device 4 and the third arm 3032 move in conjunction with each other, but protrudes from the projection device 4. In order not to make the projection distance short, that is, as shown in FIG. 3, the interlocking member relief portion 701 is provided on the case side of the projection device 4 so as not to protrude. The escape portion 701 may be provided as necessary.
In addition, the installation position of the interlocking member 301 is not limited to the first arm 302 and the third arm 3022, and the second arm 303 and the fourth arm 3032 may be provided in an interlocking manner.

Note that the interlocking member 301 may be provided in the connecting portion 305 that connects the two rigid members of the projection distance setting mechanism. That is, it is more convenient if the interlocking member is positioned at a connecting portion (tip portion) that connects the respective rigid members of the projection distance setting mechanism provided on both sides of the projection device 4.
In such a configuration, since the tip end portion of the projection distance setting means 3 is linear by the interlocking member, it becomes easy to position the tip portions of the projection distance setting mechanisms at both ends.
Further, it is very easy to parallel the tip portion that is linear and the projection surface 1 of the screen member 2. In other words, since the distance from the projection surface 1 to the projection device 4 is the same on the left and right sides, and it is easy to install them in parallel, the user simply places the tip of the projection distance setting mechanism at both ends of the projection distance setting means 3 on the projection surface 1. A display image without distortion in the left-right direction can be obtained more easily by being pressed against and placed and projected.

  In addition, since the angle can be changed by the connecting portion 305 of the first arm 302 and the second arm 303 of one projection distance setting mechanism, the fourth arm 3032 of the other projection distance setting mechanism is not necessarily required. . This is because by connecting the first arm 302 and the third arm 3022 with the interlocking member 301, the positions of the two tip portions in the longitudinal direction of the projected image are secured. However, in the case where the tip portions on both sides of the projection distance setting means 3 are placed against a hard wall such as a wall, the fourth arm 3032 is provided to ensure the strength (rigidity) of the projection distance setting mechanism. Better.

  FIG. 5 plots the distance H between the handle portion (movable portion) 306 and the fulcrum 302 of the projection distance setting mechanism and the distance D between the case 7 and the connecting portion 305 as described above. As is clear from the above, when the distance H is large, the change in the distance D due to the change in the distance H becomes large. Therefore, the length of the arm may be set according to the projection distance so that the change in the distance D does not become so large. Further, when the arm handle (movable part) 306 is moved along the guide 307, even if the movement distance is the same, the amount of change in the projection distance differs depending on the length of the arm. An appropriate arm length may be determined.

  In addition, the location of the connection part of the two rigid members of the projection distance setting mechanism constituting the projection distance setting means 3 is shown in FIG. 3 as two rigid members (first arm 302 and second arm 303 (or third arm 3022). Although the tip ends of the fourth arm 3032)) are not necessarily the tip ends of the two rigid members.

For example, if it demonstrates with apparatus sectional drawing shown to Fig.10 (a)-(c), the 1st rigid member and the 2nd rigid member of the projection distance setting mechanism which comprise the projection distance setting means 3 differ in length, and the 1st The rigid member and the second rigid member are connected so that the angle formed by the connecting portion can be changed.
More specifically, the first rigid member is longer than the second rigid member, and one end side is coupled to the projection device 4 by the support portion, and the first rigid member rotates around this vicinity. Since the second rigid member is shorter in length than the first rigid member, its tip side is movably connected to a long hole or groove provided near the center of the first rigid member. The end on the opposite side is supported by a groove-shaped guide provided in the case of the projection device 4 extending in the vertical direction, and can slide along the guide in the vertical direction in the figure. With such a configuration, the distance between the connecting portion and the support portion of the first rigid member supported on the projection device side is T1, and the tip portion of the first rigid member protruding from the projection device 4 is supported on the projection device side. When the distance between the first rigid member and the supporting portion is T2, a longer projection distance can be obtained by setting T1 <T2.

  In the example of FIG. 3 described above, the two rigid members (first arm and second arm) have the same length and are approximately half the length of the projection device 4 in the vertical direction. It is about half the length of the projection device 4 in the vertical direction. On the other hand, in the example of FIG. 10, the second rigid member is about half of the length in the vertical direction of the projection device 4 like the two rigid members (arms) of FIG. 3. Since the length is 4/5 or more of the length in the vertical direction of the projection device 4, the projection distance dmax is 4 of the length in the vertical direction of the projection device 4 in the state where the projection distance shown in FIG. / 5 or more, and a projection distance that is 1.6 times longer than that of the configuration of the projection distance setting mechanism in FIG. 3 can be obtained.

[Example 2]
Next, as a second embodiment of the present invention, means that can set the distance between the projection device 4 and the projection position further by changing the installation form of the projection device 4 will be described below.
Specifically, in this embodiment, as shown in FIG. 11, the optical path of the enlarged projection optical system of the projection apparatus 4 having the same configuration as the projection apparatus 4 shown in FIG. (Between the optical system (mirror)) is provided with a projection optical path folding mirror that folds the optical path, the optical path of the projection light from the first optical system is folded by the projection optical path folding mirror, and then incident on the second optical system (mirror), The light is reflected by the second optical system (mirror) and enlarged and projected onto the projection surface 1. In this way, by changing the projection direction by bending the projection optical path in the middle, the projection device 4 can be installed and used in an upright manner. By adopting such a configuration, for example, the height direction of the projection device 4 becomes long, and the length of the rigid member constituting the distal end portion of the projection distance setting mechanism of the projection distance setting means 3 according to the length. Can be set longer.
That is, the distance T2 between the distal end portion of the rigid member of the projection distance setting mechanism that protrudes from the projection device 4 and the support portion of the rigid member supported on the projection device side is larger than the depth D of the projection device 4 in the projection direction. The configuration was increased.

The present embodiment will be described in detail with reference to FIG.
In the case of FIG. 1, the projection device 4 is installed horizontally, but in this embodiment, a configuration in which the projection device 4 can be installed vertically as shown in FIG. 11 is adopted.
The direction of the projection surface 1 is the same. That is, the direction perpendicular to the paper surface is the longitudinal direction (horizontal direction) of the projection image, the vertical direction of the paper surface is the short direction (vertical direction) of the projection image, and the horizontal direction of the paper surface is the projection direction.

  As shown in FIG. 5, the length of the projection distance (the distance between the projection device and the projection surface) is substantially determined by the length of the rigid member (arm) of the projection distance setting mechanism. That is, the longer the length of the rigid member (arm), the greater the amount of protrusion of the rigid member (arm) from the case. On the other hand, if the rigid member (arm) becomes longer, it protrudes from the apparatus even when stored, and the occupied area of the projection apparatus 4 increases. Therefore, if the length of the rigid member (arm) is within the range of the size of the device (length in the vertical direction), there is an advantage that it can contribute to downsizing of the device.

  In this embodiment, as shown in FIG. 11, a projection optical path folding mirror that bends the optical path in the middle of the optical path of the enlargement projection optical system of the projection apparatus 4 (between the first optical system and the second optical system (mirror)). Since the projection device 4 that is long in the vertical direction at the time of projection can be realized by bending the projection optical path in the middle and changing the projection direction, the length of the rigid member (arm) constituting the projection distance setting mechanism of the projection distance setting means The length can be set long. That is, the projection distance setting means 3 is provided so that the projection device 4 is installed in a standing position at the time of projection so as to be vertically long, and the rigid member (arm) of the projection distance setting mechanism is movable in the vertical direction.

In the configuration of FIG. 11, the projection optical path is bent approximately 90 degrees by providing a projection optical path folding mirror between the first optical system and the second optical system (mirror) of the projection device 4. Therefore, a projection device having a configuration similar to that shown in FIG. 1 can be installed vertically. By setting it as such a projection apparatus 4, the height direction of the projection apparatus 4 becomes longer than a horizontal direction, and length of the rigid member (arm) which comprises the projection distance setting mechanism of the projection distance setting means 3 is lengthened. Can do.
And since the length of a rigid member (arm) can be lengthened, the adjustment range of a projection distance can be expanded. In FIG. 11, the distance d1 (broken line) and the distance d2 (solid line) can be set by the same mechanism as shown in FIG. 3 from the outer end of the projection device 4 on the projection surface side. . Moreover, as shown in FIG. 11, when the depth near the installation part of the projection device 4 is D, it is possible to set the projection distance d2 larger than D.
Arranging the projection device 4 in a vertical shape in this way to obtain a projection surface is a unique effect that cannot be achieved in the first embodiment (FIG. 6 and the like).

  In the case of FIG. 11, since the two rigid members (arms) constituting the projection distance setting mechanism of the projection distance setting means 3 are connected at the tip, the projection distance d2 is the length of the projection device 4 in the height direction. However, in the apparatus having a height higher than the depth D of the projection apparatus 4, the effect of extending the projection distance becomes high.

As another embodiment, as shown in FIG. 12, the lengths of the two rigid members (first rigid member, second rigid member) constituting the projection distance setting mechanism of the projection distance setting means 3 are different. When the connecting portion of the one rigid member and the second rigid member is not the tip of the two rigid members, the projection distance setting mechanism is the same as in FIG. 10, and the setting range of the projection distance is more effectively extended. Is possible.
That is, as shown in FIG. 12, a long hole-like or groove-like connecting portion is provided in the vicinity of the approximate center of the first rigid member supported by the support portion of the projection device 4, and one end side of the second rigid member is provided in this connecting portion. And the other end side of the second rigid member is movably supported by the guide unit of the projection device 4 so that the tip of the projection distance setting mechanism becomes the tip of the first rigid member. By setting the length of the rigid member close to the length of the projection device 4 in the height direction, the projection distance setting range can be further extended.

As yet another embodiment, as shown in FIG. 13, the length of the two rigid members (arms) constituting the projection distance setting mechanism of the projection distance setting means 3 is the same, and the height of the projection device 4 is set. It is also possible to adopt a form in which the angle of the connecting portion of the two rigid members (arms) is closed close to the length in the direction. With such a configuration, it is possible to further secure the distance between the tip portion 1101 of the projection distance setting means 3 and the projection device 4 and to enlarge the projection distance setting range.
Thus, the distance T2 between the tip of the projection distance setting mechanism protruding from the projection device 4 of the projection distance setting means 3 and the support portion supported on the projection device side is based on the depth D in the projection direction of the projection device 4. By making it larger, the movable range of the projection distance can be set larger.

  In addition to the above-described configuration, as in FIGS. 3 and 4, two projection distance setting mechanisms of the projection distance setting means 3 are provided in the longitudinal direction of the projection screen with respect to the projection device 4, and the above-described interlocking operation is performed. By connecting with the member, the projection amount from the projection device 4 at the tip part of the two projection distance setting mechanisms of the projection distance setting means 3 can be made the same amount. In the case of projecting, the projection distance can be easily set by placing it in contact with the wall surface, or in the case of projecting on a plate-like screen, the screen surface). In addition, since the projection distance in the longitudinal direction (horizontal direction) of the projection image can be made constant, the projection image without distortion in the longitudinal direction of the screen (horizontal direction of the screen) is eliminated by eliminating the magnification error in the longitudinal direction (horizontal direction) of the projection image. It became possible to get.

[Example 3]
Next, as still another embodiment of the present invention, in the third embodiment, the rigid member having the tip portion protruding from the projection device 4 constituting the projection distance setting mechanism of the projection distance setting means 3 is plate-shaped. This is a member (hereinafter referred to as a plate), and one side of the plate is a tip portion protruding from the projection device.
Further, the rigid member having the tip protruding from the projection device 4 also serves as an opening cap so as to block the projection light from the projection opening of the projection device 4 during non-projection.

  The configuration and operation of the third embodiment will be described in detail with reference to FIG. As shown in FIG. 14A, in this embodiment, one of the rigid members constituting the projection distance setting mechanism of the projection distance setting means 3 is constituted by a plate 802. And this board 802 has the length comparable as the length of the horizontal direction (the longitudinal direction of a projection image) of the projection apparatus 4, and is shared by the projection distance setting mechanism provided in the both sides of the projection apparatus, and interlock | cooperates. It also has a function as a member. The plate 802 also serves as an opening cap that closes the projection window 808 when not in use.

More specifically, the plate 802 is coupled to the case 807 of the projection device 4 by a support portion 803, and opens here as a fulcrum. Further, a groove-like connecting portion 804 is provided on a side surface of the plate 802, and one end side of a first arm 801 made of a rigid member constituting one projection distance setting mechanism is connected to the connecting portion 804. . In the connecting portion 804, the angle between the first arm 801 and the plate 802 is variable. Further, the first arm 801 can move in the vertical direction along a guide groove 806 provided in the case 807 of the projection device 4. Therefore, by moving the movable portion 805 of the first arm 801 in the vertical direction along the guide groove 806, the angle of the connecting portion 804 changes, and the amount of protrusion of the tip portion 809 of the plate 802 can be adjusted.
Further, as shown in FIG. 14E, a connecting portion 8042 to which the second arm 8012 of the projection distance setting mechanism on the other side is connected at a position facing the first arm 801 on the other side surface of the plate 802. Are connected by the same mechanism as the first arm 801 side.
In the present embodiment, since the common plate 802 is used for the rigid member constituting the tip portions of the two projection distance setting mechanisms of the projection distance setting means 3, the second arm 8012 is not necessarily required. However, in order to maintain the strength of the projection distance setting mechanism and increase the accuracy of the projection distance setting, it is better to provide the second arm 8012.

The operation and action of the projection distance setting means 3 of this embodiment will be described with reference to FIGS. 14 (b), 14 (c) and 14 (d).
FIG. 14B shows a state in which the interval (projection distance) between the projection device 4 and the projection surface 1 is set to be the longest, and FIG. 14D shows the interval (projection distance) between the projection device 4 and the projection surface 1. Is the shortest state. FIG. 2C shows an intermediate state. FIG. 5E is a view of the projection distance setting means and the projection device in the state of FIG. The longitudinal direction (lateral direction) of the projection screen is a direction perpendicular to the paper surface in FIGS. 14A to 14D, and the vertical direction in FIG.

In this embodiment, the tip portions of the two projection distance setting mechanisms of the projection distance setting means 3 that come into contact with the projection surface 1 are common plate-like rigid members (plates 802). Is continuous in the lateral direction of the projection surface, and when it strikes the projection surface 1, a continuous contact is born.
That is, in the above-described first and second embodiments, the two projection distance setting mechanisms of the projection distance setting means 3 are combined with two arm-shaped rigid members, respectively. The tip portions of the two projection distance setting mechanisms are points, but in the present embodiment, the plate-like rigid member (plate 802) becomes a linear tip portion in which continuous points are arranged in the longitudinal direction. This continuous state also includes two or more locations.

  As shown in FIG. 14, the feature of the present embodiment is that the rigid member that determines the projection distance is a plate-like member 802, which makes it possible to contact the projection surface 1 such as a screen or a wall (front end). Part) is linear. As an effect, since the tip portion is linear, the tip portions at both ends are easily positioned. In addition, it is very easy to make the linear tip portion parallel to the projection surface 1. That is, the distance from the projection surface 1 to the projection device 4 is the same on the left and right, and it is easy to install them in parallel. Therefore, the user simply presses the tip of the common plate 802 in the two projection distance setting mechanisms of the projection distance setting means 3 against the projection surface 1 such as a screen or a wall, and projects it. Display without distortion in the left-right direction (longitudinal direction of the projected image) can be obtained more easily.

Furthermore, as another feature of the present embodiment, in addition to the above-described configuration, the plate-like rigid member 802 common to the two projection distance setting mechanisms of the projection distance setting means 3 is not used. As shown in FIG. 4, the projection cap 4 also serves as an opening cap.
As an effect, although the member protruding to set the projection distance becomes unnecessary when not in use, the member also serves as an opening cap of the projection device 4, thereby further sharing parts. This means that the number of points has been reduced and it has become possible to contribute to weight reduction and cost reduction. Moreover, the effect that the loss of the opening cap which was removed at the time of use can be prevented is also acquired.

[Example 4]
Next, as yet another embodiment of the present invention, a fourth embodiment will be described with reference to FIG.
In the present embodiment, the rigid member having the tip portion constituting the projection distance setting mechanism of the projection distance setting means 3 protruding from the projection device 4 is provided with a second protrusion that further protrudes in the projection direction. It features.
Here, FIG. 15A is a cross-sectional view when the projection distance setting means and the projection apparatus are viewed from the lateral direction, and FIG. 15B is a top view when the projection distance setting means and the projection apparatus are viewed from above. .

  In the present embodiment, as in the third embodiment (FIG. 14), the first rigid member constituting the projection distance setting mechanism of the projection distance setting means 3 is configured by a plate-shaped member (plate). And this plate-shaped 1st rigid member has the length comparable as the length of the horizontal direction (longitudinal direction of a projection image) of the projection apparatus 4, and the projection distance setting mechanism provided in the both sides of the projection apparatus And has a function as an interlocking member. Further, the movable mechanism of the plate-like first rigid member is the same as that of the third embodiment (FIG. 14). In this embodiment, a second protrusion is further embedded at the tip of the plate-like first rigid member.

Although a detailed drawing is not shown, a screw mechanism is provided in the embedded portion of the second protrusion, for example, a screw hole is provided in the tip of the first rigid member (plate), and the second The protruding portion is cut with a male screw that is screwed into the screw hole, and the protruding amount can be adjusted by screw feeding.
The adjustment mechanism for the protrusion amount is not limited to the screw feed mechanism, and may be another mechanism as long as it can adjust the protruding amount of about 10 mm in length.

  As described above, in this embodiment, since the second projecting member projecting in the projection direction is further provided at the tip of the first rigid member projecting from the projection device 4 of the projection distance setting mechanism, the image is displayed. Even if there is a protrusion on the projection surface such as a projection wall or screen, the parallelism with the projection surface can be maintained, and the projection distance setting means 3 is parallel due to the unevenness of the contact position between the tip and the projection surface. Even if the degree is out of order, the amount of protrusion of the second protruding member can be adjusted, so that the parallelism can be adjusted.

[Example 5]
Next, as yet another embodiment of the present invention, a fifth embodiment will be described with reference to FIG.
In the present embodiment, the projection type image display system having the projection apparatus having the configuration described in the first embodiment or the like is provided with two projection distance setting means 3 in the short direction of the projection image. is there.
FIG. 16 shows an embodiment thereof. FIG. 16 is a diagram of the main part of the projection-type image display system (part of the two-stage projection distance setting means) as seen from the side as in FIG. 3, and the configuration and operation of the two-stage projection distance setting means. It is explanatory drawing of.
In FIG. 16, the projection distance setting means 3-1 and 3-2 having two or more projection distance setting mechanisms composed of a pair of two rigid members coupled to be variable in angle are arranged in two stages in the vertical direction of the projection device 4. Is set to That is, in this embodiment, two tip portions protruding from the projection device of the projection distance setting means can be provided in the vertical direction. Note that the operation of the individual projection distance setting means is the same as in any one of the first, second, and third embodiments, and thus detailed description thereof is omitted here.
As an example, as shown in FIG. 16, the projection distance setting mechanisms of the projection distance setting means 3-1 and 3-2 installed in the upper and lower stages are configured as shown in FIGS. 3 and 4 of the first embodiment. However, the length of the rigid member (arm) constituting each projection distance setting mechanism is about half that in the case of FIG.

  In the present embodiment, as shown in FIG. 16, since the projection distance setting means 3-1 and 3-2 are provided at two locations in the vertical direction of the projection device 4, it is possible to correct the tilt of the projection device 4. I can do it now. Further, since the projection distance setting means 3-1 and 3-2 are provided in two stages, as shown in FIG. 17, the projection device 4 can be used by being rotated by 90 degrees, and the projection surface 1 is set in the horizontal direction. A projection style to be selected can be selected. Moreover, the foot | leg part of the projection apparatus 4 required in that case can also serve as the projection distance setting means 3-1 and 3-2.

[Example 6]
Next, as yet another embodiment of the present invention, a sixth embodiment will be described with reference to FIG.
In the present embodiment, the projection device 4 has a guide function so that the projection amount of the projection distance setting mechanism of the projection distance setting means can be set according to the prescribed projection size or the prescribed projection distance. is there.
FIG. 18 shows the embodiment, and the angle of the arm members (the first arm 302 and the second arm 303) can be set by the guide function provided in the projection device 4 so as to have a prescribed projection distance in advance. It is a thing.

  As shown in FIG. 18, one end of the first arm 304 made of a rigid member constituting the projection distance setting mechanism of the projection distance setting means 3 can swing on a support portion (fulcrum) 304 provided on the case 7 of the projection device 4. One end of a second arm 303 made of a rigid member is connected to the connecting portion 305 on the other end side of the first arm 302. The other end side of the second arm 303 is movably supported by a groove-shaped guide portion 307 provided along the longitudinal (vertical) direction of the case 7 of the projection device 4.

In FIG. 18, the projection distance is 0 (zero) when the first arm 302 and the second arm 303 are extended in a straight line, and the maximum projection distance d when the movable part 306 and the support part (fulcrum) 304 are closest. It is said. And the guide part 307 in the meantime is provided with the notch groove of the direction which crosses the guide part 307 in the position of the projection distance a, the projection distance b, and the projection distance c. Since the arm portion can be fixed by engaging the protrusion provided on the movable portion 306 of the second arm 303 with the notch groove, the projection distance can be determined reliably.
In addition, a projection size guide display is provided in the case 7 of the projection device 4, and a screen size corresponding to the projection distance determined according to the position of the movable unit 306 is described. Therefore, the user can set the projection distance at which the desired screen size can be obtained by selecting the desired screen size and aligning the movable portion 306 of the second arm 303 at that position.

In addition, the notch groove provided in the case 7 of the projection device 4 rotates the projection device 4 by 90 degrees and also uses the projection distance setting means 3 as a leg portion of the projection device 4 as shown in FIG. Is very suitable. This is because when the projection apparatus shown in FIG. 18 is rotated by 90 degrees, a notch groove is provided in the direction of the weight of the apparatus, so that the movable part 306 in the guide part 307 is cut by the weight. It is engaged with the notch groove, and displacement of the position of the movable part in the guide can be prevented.
Moreover, if the optimal projection size according to a projection distance is specified in the position of each notch groove provided in the position of the projection distance a of the guide part 307, the projection distance b, and the projection distance c, a user will do. When setting the required screen size, it is also a guide for determining the projection distance of the device.

The projection size guide display may be directly described on the case body of the projection device 4 as shown in FIG. 18, but is displayed as a projection image in conjunction with the movable portion 306 of the second arm 303. It may be.
For example, the position of the movable unit 306 of the second arm 303 may be detected by a sensor or the like provided in the guide unit 307 of the projection device, and the projection size may be displayed by the control unit configuring the projection device 4. Further, at the time of display, it may be overlapped with an external input image. Furthermore, when the projection device 4 is provided with a display unit (display device) such as a small LCD, the projection unit 4 may display the display unit.

  Furthermore, in the present embodiment, the position of the movable portion 306 of the second arm 303 can be detected by a sensor or the like provided in the guide portion 307 of the projection device 4, so that the position is detected at the position of the movable portion 306 in the guide portion 307. In accordance with the projection screen size and the projection distance, the control unit of the projection device 4 can automatically move the lens group constituting the projection lens to automatically perform focusing. In this way, if the focusing can be automatically performed according to the set projection size, it is possible to save the time spent by the user on the focusing and to quickly display the projection image. .

  The “projection distance setting means for determining the projection distance that is the distance between the projection surface and the projection device” of the present invention is a constituent requirement of the projection type image display system, but as shown in the above embodiment. , Necessarily a projection device (the projection device here is "at least an image forming unit that forms an image having a short side that is a short side of a projection image and a long side that is a long direction and having different vertical and horizontal lengths; A first optical system composed of a lens and a second optical system composed of a reflection mirror having a power for reflecting the projection light from the first optical system toward the projection surface; It is not limited to a configuration integrated with a projection optical system that enlarges and projects a formed image, and a projection apparatus that includes a case that covers the projection optical system and the image forming unit. That is, although not shown, the “projection distance setting means” and the “projection device” may be separated.

  In other words, the “projection distance setting means” and the “projection device” may be configured to be separable. By configuring the projector so that it can be separated, when projecting from a fixed position, such as when the projector is suspended from the ceiling, separating the projection distance setting means simplifies the system, such as weight reduction. Is planned. In addition, usability can be improved, for example, the “projection distance setting means” can be used for a plurality of “projection devices”.

In addition, a function of “projection distance setting means” suitable for the “projection device” may be attached to a dedicated stand on which the “projection device” is installed or a stand on which the projection device is installed. In other words, the projection distance of the “projection device” may be set by the function of the “projection distance setting means” via the projection device dedicated table or the installation table of the projection device. The “projection distance setting means” is not a “projection device” main body, but is attached to a projection device dedicated base or a projection device installation base, so that it is possible to construct a system in which only the “projection device” can be replaced. Improvement is achieved.
Further, the “projection distance setting means” may be provided on the screen or wall side holding the projection surface.

  That is, the gist of the present invention is that a projection device having a slow ratio of less than 1 to 0.5 can easily position a distance from a projection surface (image display surface) such as a screen or a wall, and the screen or wall. Since the parallelism with the projection surface (image display surface) such as the above can be accurately positioned, it is “the interval between the projection surface and the projection device via a dedicated stand or installation stand of the projection device. A projection-type image display system in which the “projection distance setting means for determining the projection distance” functions and a “projection distance setting means for determining the projection distance that is the interval between the projection surface and the projection device” are provided on the projection surface side. Thus, any projection type image display system capable of accurately positioning with respect to parallelism with a projection surface such as a screen or a wall shall be included in the claims of the present invention.

1: Projection surface 2: Screen member (or wall, etc.)
3: Projection distance setting means (projection distance setting mechanism)
3-1 and 3-2: Projection distance setting means provided in two stages 4: Projection device 5: Illumination optical system 6: First optical system 7: Case 8: Aperture 9: Second optical system (mirror)
10: Image forming unit 13: Control unit 14: Interface 15: External input device 301: Interlocking member 302: First arm (rigid member)
303: Second arm (rigid member)
304: fulcrum 305: connecting part 306: handle part (movable part)
307: Guide unit 501: Light source 502: Color filter 503: Second illumination light folding mirror 504: Light tunnel 505: Lens 506: First illumination light folding mirror 3022: Third arm (rigid member)
3032: Fourth arm (rigid member)

JP 2009-251204 A JP 2009-69572 A

Claims (12)

In a projection-type image display system that displays an image projected by enlarging and projecting an image formed by an image forming unit according to image information on a projection surface,
At least an image forming unit that forms an image having a short side that is a short side of a projected image and a long side that is a long side and having different vertical and horizontal lengths, a first optical system including a lens, and the first A projection optical system for enlarging and projecting an image formed by the image forming unit, including a second optical system including a reflection mirror having a power for reflecting the projection light from the optical system toward the projection surface; A projection apparatus including a projection optical system and a case covering the image forming unit;
A projection distance setting means for determining a projection distance which is an interval between the projection surface and the projection device;
Consists of
The projection distance setting means has two or more projection distance setting mechanisms composed of a set of two rigid members that are connected to be variable in angle, and each projection distance setting mechanism is a connecting portion of the two rigid members. It is supported by the projection device so that the angle can be varied, and is configured such that the tip portion protrudes from the projection device by changing the connecting portion angle of the two rigid members in the short direction of the projection image. The projection type image display system is characterized in that at least two locations where the tip of the projection distance setting mechanism protrudes from the projection device are provided in the longitudinal direction of the projection image. The projection type image display system according to claim 1,
The projection type image display system, wherein at least two projection distance setting mechanisms of the projection distance setting means are connected by an interlocking member. In the projection type image display system according to claim 2,
The interlocking member is located at a tip portion of the projection distance setting mechanism protruding from the projection device. The projection type image display system according to claim 1,
The interval between the rigid member connecting portion of the projection distance setting mechanism and the support portion supported on the projection device side is T1, and the tip portion protruding from the projection device and the support device supported on the projection device side. A projection-type image display system, wherein T1 <T2 is satisfied, where T2 is a distance from the unit. The projection type image display system according to claim 1,
When the interval between the tip portion projecting from the projection device of the projection distance setting mechanism and the support portion supported on the projection device side is T2, the T2 is based on the depth D in the projection direction of the projection device. A projection-type image display system characterized by being enlarged. The projection type image display system according to claim 1,
The rigid member having a tip protruding from the projection device of the projection distance setting mechanism is a plate-like member in which an interlocking member is integrated, and the tip from which one side of the plate-like member protrudes from the projection device. Projection-type image display system characterized by being a part. In the projection type image display system according to claim 6,
A projection type image display characterized in that a rigid member having a tip protruding from the projection device of the projection distance setting mechanism also serves as an opening cap so as to block the projection light from the projection opening during non-projection. system. In the projection type image display system according to any one of claims 1 to 7,
A projection-type image display system, wherein a second projecting member projecting in the projection direction is further provided at a tip portion projecting from the projection device of the projection distance setting mechanism. In the projection type image display system according to claim 8,
The projection type image display system characterized in that the projection amount of the second projection member can be adjusted. The projection type image display system according to claim 1,
A projection type image display system, wherein the projection distance setting means is provided in two stages in the short direction of the projection image. The projection type image display system according to any one of claims 1 to 10,
A projection type image display system having a guide function so that a projection amount of the projection distance setting mechanism of the projection distance setting means can be set according to a prescribed projection size or a prescribed projection distance. The projection type image display system according to claim 11,
A projection-type image display system, wherein the projection optical system is automatically focused in conjunction with the guide function.

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