Projection image adjustment device and image projection system

Abstract

To provide a projection image adjustment device that easily adjusts a projection image to be projected on a projection surface.SOLUTION: A projection image adjustment device 100 comprises a base part 110 to which a projection device 1 is attached, and a moving part 120 that moves the position of the base part in a predetermined direction of movement A. The projection image adjustment device has a rotating mechanism 130 that rotates the projection device around a rotation axis Ot that is perpendicular to a surface including the direction of movement A and a projection direction P of the projection device. The rotation axis is located to pass through an area of the projection device attached to the base part.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a projection image adjustment device and an image projection system. [Background technology]

[0002] 2. Description of the Related Art Conventionally, a projection image adjustment device is known that includes a base portion to which a projection device is attached and a moving portion that moves the position of the base portion in a predetermined moving direction.

[0003] For example, Patent Document 1 discloses a mounting device (projection image adjustment device) that includes a mounting section (base section) for mounting a projector (projection apparatus) and an elevation section (movement section) that moves the position of the mounting section in the direction of gravity. The elevation section is connected to the mounting section via a pivot section provided at its upper end. The pivot section is configured to be pivotable around a rotation axis that extends horizontally and in a direction perpendicular to the projection direction of the projector mounted on the mounting section. By rotating the pivot section around the rotation axis, the projection direction of the projector can be changed in the vertical direction, and the image projected from the projector can be projected onto a horizontal or vertical surface. Summary of the Invention [Problem to be solved by the invention]

[0004] However, conventional projection image adjustment devices have had the problem that it is difficult to adjust the projection image projected onto the projection surface. [Means for solving the problem]

[0005] In order to solve the above-mentioned problems, the present invention provides a projection image adjustment device comprising a base portion to which a projection device is attached and a moving portion that moves the position of the base portion in a predetermined moving direction, and characterized in that it has a rotation mechanism that rotates the projection device around a rotation axis perpendicular to a plane that includes the moving direction and the projection direction of the projection device, and the rotation axis is positioned so as to pass through the area of ​​the projection device attached to the base portion. [Effects of the Invention]

[0006] According to the present invention, it is possible to provide a projection image adjustment device that makes it easy to adjust a projection image projected onto a projection surface. [Brief explanation of the drawings]

[0007] [Figure 1] FIG. 1 is a perspective view showing a projector according to an embodiment. [Figure 2] FIG. [Figure 3] A table showing the relationship between the projection distance and screen size for this projector. [Figure 4] FIG. 2 is a perspective view showing the configuration of the image projection system in a state in which the projector is attached to a dolly. [Figure 5] FIG. 2 is a perspective view showing the configuration of the image projection system in a state where the projector, the bracket, and the dolly are separated. [Figure 6] FIG. 10 is an explanatory diagram showing an example of the correspondence relationship between the height of the projector and the size of the image projected onto the floor surface. [Figure 7] FIG. 10 is an explanatory diagram showing the height of the projector when a projection image corresponding to a small display size is projected onto the floor surface. [Figure 8] A graph plotting the relationship between screen size and projection distance (height) when projecting onto the floor for each throw ratio TR of the projector. [Figure 9] FIG. 2 is a perspective view showing a bracket to which the projector is attached. [Figure 10] 5A to 5C are explanatory diagrams showing the movement of the lifting mechanism of the embodiment. [Figure 11] FIG. 2 is an explanatory diagram showing the configuration of the main part of the lifting mechanism. [Figure 12] FIG. 4 is an explanatory diagram showing a shaft clamp that constitutes the lifting mechanism. [Figure 13] 5A and 5B are explanatory diagrams showing the movement of the tilt adjustment mechanism according to the embodiment. [Figure 14] FIG. 4 is an explanatory diagram showing the configuration of a fixing part of the tilt adjustment mechanism. [Figure 15]10A and 10B are explanatory diagrams illustrating a case where the projection direction of the projector is changed by the tilt adjustment mechanism. [Figure 16] FIG. 4 is an explanatory diagram showing a swivel mechanism according to the embodiment. [Figure 17] 4A to 4C are explanatory diagrams showing the movement of the swivel mechanism. [Figure 18] 10 is an explanatory diagram illustrating a case where the rotation angle of the projection image is changed by rotating the dolly. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] An embodiment of an image projection system to which the present invention is applied will be described below. The image projection system according to this embodiment is composed of a projector, which is an image projection device, and a dolly, which is a projection image adjustment device that enables adjustment of the projection image projected onto the projection surface by the projector.

[0009] First, the basic configuration of the projector according to this embodiment will be described. FIG. 1 is a perspective view showing a projector 1 according to the present embodiment. FIG. 2 is a view of the projector 1 as seen from the right side, showing an example of the relationship between the projection distance and the screen size. These figures show a usage mode in which an image is projected onto a screen 200, which serves as a vertical projection surface. In this usage mode, a top plate 2a constituting the top surface of the housing 2 of the projector 1 is provided with an operation unit 11 consisting of operation buttons and the like for the user to give various instructions for operating the projector 1.

[0010] FIG. 3 is a table summarizing the relationship between the projection distance and the screen size of the projector 1. As shown in Fig. 3, by adjusting the projection distance D in the range of 0.8m to 1.55m, the screen size (diagonal size) can be changed from 150 inches to 300 inches, nearly double. Because the projector 1 has a depth (the left-right direction in Fig. 2), the distance Di between the screen 200 and the projector 1 can also be adjusted; in this example, by setting the value of Di in the range of 0.34m to 1.1m, the screen size can be set arbitrarily within the above range.

[0011] 3 is just one example, and if the desired quality can be maintained by bringing projector 1 close enough to screen 200 to project, the screen size adjustment range will be even wider. Also, it goes without saying that if the projection distance D is made greater than 1.1 m and the desired image quality can be maintained, a larger screen size can be achieved.

[0012] The housing 2 contains a projection optical system 15, and projection light from the projection optical system 15 is projected through the projection window 3. The projection optical system 15 is made up of a lens group 15a and a concave mirror 15b, and FIG. 2 shows the configuration of the projection optical system 15 as viewed from the side.

[0013] The projection light projected from the projection window 3 is focused by the lens group 15a of the projection optical system 15 and then reflected by the concave mirror 15b, where the light beam is narrowed before emitting from the projection window 3. The projection light spreads after leaving the projection window 3 and forms an image on the desired image plane. A recess 2f is provided in the top plate 2a to prevent the projection light from the projection window 3 from being blocked. The projection optical system 15 housed in the housing 2 is also provided with a focus drive ring for adjusting the focus of the projection image V projected and displayed on the projection surface (screen 200), and the focus drive ring has an electric focus function driven by a motor. The projection image V can be easily enlarged or reduced by changing the projection distance D because the throw ratio TR is very small.

[0014] The right side plate 2d that constitutes the right side of the housing 2 is provided with an AC inlet 13 for supplying power to the device, an external connection terminal 14 for connecting to external devices such as a personal computer or video camera, etc. A human presence sensor 16 is provided near the projection window 3 as a safety device that cuts off the emission of projection light when a person approaches. Functions can be cut off depending on the situation in which you want to use it.

[0015] An exhaust port is provided in the left side plate 2c that constitutes the left side surface of the housing 2, for exhausting air from inside the housing 2. Meanwhile, an air intake port 17 is provided in the right side plate 2d of the housing 2, for taking in outside air. The air drawn into the housing 2 through the air intake port 17 flows inside the housing 2, cools the devices inside the housing 2, and increases in temperature, before being exhausted to the outside through the air intake port in the left side plate 2c. Note that the positions of the air intake port 17 and the air exhaust port are merely examples, and the air intake and exhaust port may be provided, for example, on the front side 2b for more efficient cooling.

[0016] The projector 1 can project an image onto a screen or the like using an illumination optical unit that includes a light source, a DMD (Digital Mirror Device), and the like.

[0017] Next, the image projection system according to this embodiment will be described. The image projection system according to this embodiment is used when the above-described projector 1 is used in a usage mode in which, for example, a horizontal surface such as a floor or ceiling surface is used as the projection surface. To cite a specific example, at a construction site, work is performed to draw dimension lines (a work known as "marking out"). During this marking out work, the image projection system is used to project an image of a design drawing or the like onto the floor, and the projected image (design drawing) is traced to draw dimension lines on the floor, thereby speeding up and facilitating the work.

[0018] Image projection systems used for such marking work are required to adjust the form of the projected image, such as the size, shape (such as correcting trapezoidal distortion), and rotation angle (the angle of rotation around a rotation axis perpendicular to the image plane) of the projected image of a design drawing, etc. Therefore, the image projection system needs at least a mechanism (movement unit) that changes the height of the projector 1 (the distance between the floor where the projection surface is located and the projection device) to change the size of the projected image, and a mechanism (rotation mechanism) that rotates the projector 1 to change the shape and rotation angle of the projected image, etc.

[0019] However, in a configuration in which the height of projector 1 changes significantly as it is rotated, it is difficult to adjust the size, shape, rotation angle, and other aspects of the projected image, making it difficult to achieve a desired projection image. In particular, when used for the above-mentioned marking work, for example, it is necessary to mark dimensions at a fixed distance from a reference position (such as a pillar of a building), so adjustments to the projection image of the design drawings or the like must be made while maintaining a constant distance between the projected image and the reference position, making the work even more difficult.

[0020] Therefore, the image projection system in this embodiment supports the above-mentioned projector 1 using a dolly 100 that makes it easy to adjust the projection image projected onto the floor surface, and adjusts the projection image using various mechanisms provided on the dolly 100.

[0021] 4 and 5 are perspective views showing the configuration of the image projection system according to this embodiment. The image projection system shown in FIG. 4 is in a state where the above-described projector 1 is attached to a dolly 100. The image projection system shown in FIG. 5 is in a state where the projector 1, a bracket 110 (described later), and a dolly 100 are separated from each other.

[0022] In the image projection system of this embodiment, the distance between the floor surface (projection surface) and the projector 1 can be changed by changing the height of the projector 1, and the size of the image projected onto the floor can be enlarged or reduced. Fig. 6 shows an example of the correspondence between the height of the projector 1 and the size of the image projected onto the floor. Note that Fig. 6 also shows the image projection system alongside an image of a person who is 170 cm tall, to provide a rough idea of ​​the height of the projector 1.

[0023] The above-described projector 1 has a throw ratio TR (throw ratio: the ratio of the projection distance to the horizontal size of the screen, i.e., TR = projection distance / horizontal size of the screen) of 0.22. That is, the above-described projector 1 is an image projection device that belongs to a category called an ultra-short throw projector, with a throw ratio of about 0.2 to 0.5. Therefore, for example, if the throw ratio TR is 0.22, when a projection image corresponding to a 300-inch display size is projected onto the floor, the height of the projector 1 is set to about 150 cm. When a projection image corresponding to a 300-inch display size is projected onto the floor, the height of the projector 1 relative to the dolly 100 is set as shown in FIG. 4, but when a projection image corresponding to a 90-inch display size is projected onto the floor, the height is set as shown in FIG. 7.

[0024] When a 300-inch image is to be projected, taking into account the average human height and operability, a projector 1 with a throw ratio TR of 0.18 to 0.22 will require the projector 1 to be 150 cm or less in height, making it suitable for standing work. Conversely, when a 300-inch image or larger is to be projected, a throw ratio TR of more than 0.22 will require the projector 1 to be positioned higher than the user's height, reducing operability. Note that, although this depends on the display size, the dolly 100 of this embodiment is suitable for use with projectors with a throw ratio TR of approximately 0.2 to 0.5. A throw ratio TR of 0.2 to 0.3 is more preferable. Of course, the dolly 100 can also be used with projectors with throw ratios outside this TR range.

[0025] FIG. 8 is a graph plotting the relationship between screen size (diagonal inches) and projection distance (height) when projecting onto the floor for each throw ratio TR of projector 1 (0.18, 0.2, 0.22, 0.3, 0.4, 0.5). When increasing the size of the projected image (screen size) onto the floor, it is necessary to move projector 1 vertically (vertically) upward from the floor. When using projector 1 indoors, the ceiling height must be taken into consideration, and in that case, the upper height limit of projector 1 must be set to approximately 250 cm. If projector 1 has a throw ratio TR of 0.5, it can enlarge the screen size up to 200 inches (in the case of an aspect ratio of 10:9) within the above-mentioned upper height limit of projector 1.

[0026] However, if it is desired to project a larger screen size (for example, 300 inches), it becomes necessary to move the projector 1 to a position higher than the above-mentioned upper height limit of the projector 1. In such a case, when using the projector 1 indoors, it may become necessary to set the projector 1 at a position higher than the ceiling, making it impossible to obtain such a large screen size.

[0027] If a projector 1 has a smaller throw ratio TR, it is possible to project a larger screen size without exceeding the above-mentioned upper height limit of the projector 1. For example, if a projector 1 with a throw ratio TR of approximately 0.3 is used, it is possible to project a 300-inch screen size even if the throw distance is 200 cm. In this case, even if the projector is used indoors (indoors) where humans are expected to live (i.e., even if the height of the projector 1 is kept lower than the ceiling), it is possible to obtain a large screen size of 300 inches or more. If a projector 1 with an even smaller throw ratio TR is used, the throw distance can be further shortened, and the height of the projector 1 can be kept even lower.

[0028] On the other hand, the smaller the throw ratio TR of the projector 1, the greater the deviation of the projected image from the desired position even with a slight deviation in the position of the projector 1. Therefore, with a projector 1 having a small throw ratio TR (for example, a projector with a throw ratio of less than 0.2), there is a problem that it is difficult to align the projected image to the target projection position. In addition, the smaller the throw ratio TR, the larger the projector 1 becomes, which also causes a problem that the handling (or usability) of the projector 1 decreases.

[0029] If the screen size to be projected is small, there is no problem even if the throw ratio TR of the projector 1 is small, but if the screen size is to be increased to, for example, 300 inches or more, it is necessary to set a lower limit for the throw ratio TR taking into consideration the above-mentioned problems. From this perspective, it is preferable that the throw ratio TR of the projector 1 is 0.18 or more.

[0030] Therefore, when a large screen size projection image is required, the throw ratio TR of the projector 1 of this embodiment is preferably in the range of 0.18 to 0.5, and more preferably in the range of 0.2 to 0.3, taking into consideration the height of the indoor ceiling and ease of handling (or operability) for the user to handle the projector 1. If the throw ratio TR is in this range, the projector 1 can be used appropriately even in a limited space indoors, particularly when projecting with the projection direction set in the vertical direction (direction of gravity) (such as when projecting onto the floor), and the projector 1 is not positioned too high for the user, making it easy to handle the projector 1.

[0031] The cart 100 of this embodiment comprises a main frame 101, casters 102, a bracket 110 as a base portion, a lifting mechanism 120 as a moving portion, a tilt adjustment mechanism 130 as a rotation mechanism, and a swivel mechanism 140 as a second rotation mechanism.

[0032] The dolly 100 of this embodiment is provided with casters 102 at each of the four corners of the bottom of the main body frame 101. This allows the dolly 100 to be transported to a desired location by smoothly running on the floor. The dolly 100 is preferably provided with a fixing means for fixing the dolly 100 to the floor so that the dolly 100 does not easily move on the casters 102 at the desired installation location. The fixing means may be, for example, a locking mechanism provided on the casters 102 themselves.

[0033] Note that, instead of the casters 102, other support parts such as legs that come into contact with the floor surface, which is the support surface on which the dolly 100 is placed, at three or more contact points may be used to support the dolly 100 and the projector 1 attached thereto. In this case, for example, three or more legs may be configured to directly come into contact with the floor surface, and the dolly 100 may be fixed by static friction between the floor surface and the legs due to the dolly 100's own weight. The support parts can support the dolly 100 more stably by being configured to come into contact with the floor surface at three, four, or more contact points. A simple configuration can be a configuration that supports the dolly 100 by coming into contact with the floor surface at three points (for example, a support part consisting of three casters or three legs).

[0034] FIG. 9 is a perspective view showing a bracket 110 serving as a base to which the projector 1 is attached. The bracket 110 is composed of a main plate portion 110a disposed in a position facing the bottom plate 2e constituting the bottom surface of the projector 1, and two side portions 110b disposed in positions facing the left and right side plates 2c, 2d of the projector 1, respectively. Such a bracket 110 can be produced, for example, by bending both ends of a single long plate-like member by 90 degrees. The main plate portion 110a has a through-hole formed therein through which a fixing screw 115 is passed to be fastened to a screw hole provided in the bottom plate 2e of the projector 1. The projector 1 is attached to the bracket 110 by fastening the fixing screw 115 to the screw hole in the bottom plate 2e of the projector 1 through the through-hole in the main plate portion 110a.

[0035] Each side portion 110b of the bracket 110 is provided with an engagement pin 111 and a fixing screw hole 112. The engagement pin 111 is provided so as to protrude outward from the outer surface of each side portion 110b. The engagement pin 111 is attached to a recess formed in a mount 131 of the tilt adjustment mechanism 130, which will be described later. The fixing screw hole 112 is fastened with a chrysanthemum-shaped bolt 132 of the tilt adjustment mechanism 130, which will be described later. Fastening the chrysanthemum-shaped bolt 132 to the fixing screw hole 112 fixes the bracket 110 to the mount 131 of the tilt adjustment mechanism 130.

[0036] FIG. 10 is an explanatory diagram showing the movement of the lifting mechanism 120 of this embodiment. FIG. 11 is an explanatory diagram showing the configuration of the main part of the lifting mechanism 120. As shown in FIG. FIG. 12 is an explanatory diagram showing a shaft clamp that constitutes the lifting mechanism 120. As shown in FIG. The lifting mechanism 120 of this embodiment is composed of an operating handle 121, a joint part 122, a lifting screw 123, a nut bracket 124, a guide rail 125, a guide part 126, a fixing part 127, and a shaft clamp 128.

[0037] In the lifting mechanism 120 of this embodiment, when the operating handle 121, which is rotatably supported on the main body frame 101, is turned as shown by arrow B in Fig. 10, the shaft 121a of the operating handle 121 rotates about its axis. The joint part 122, which connects the shaft 121a of the operating handle 121, which extends horizontally, to the lifting screw 123, which extends vertically (in the direction of gravity), is configured by meshing a first bevel gear 122a provided on the shaft 121a of the operating handle 121 with a second bevel gear 122b provided on the lifting screw 123. When the first bevel gear 122a rotates due to the rotation of the operating handle 121, the rotational force is transmitted to the second bevel gear 122b, and the lifting screw 123 rotates about its axis.

[0038] A nut bracket 124 is engaged with the lifting screw 123. Two guide rails 125 extending vertically are provided on the main body frame 101, and a guide unit 126 is attached so as to be slidable vertically along these two guide rails 125. The nut bracket 124 is fixed to a swivel base 141 (described later) of the swivel mechanism 140 by a fixing unit 127, and the guide unit 126 is also fixed to the swivel base 141. As a result, when the lifting screw 123 rotates about its axis, the guide unit 126, which is guided by the two guide rails 125, and the nut bracket 124, which is fixed via the swivel base 141, rotate relative to the lifting screw 123. As a result, the nut bracket 124 and the guide unit 126 move along the axial direction (vertical direction) of the lifting screw 123 while being guided by the two guide rails 125.

[0039] Bracket 110 to which projector 1 is attached is attached to tilt adjustment mechanism 130, which will be described later. This tilt adjustment mechanism 130 is supported by swivel base 141 of swivel mechanism 140. Therefore, when operation handle 121 of lifting mechanism 120 is turned, bracket 110 moves in the vertical direction together with tilt adjustment mechanism 130 supported by swivel base 141, as nut bracket 124 moves in the vertical direction. Therefore, the height of projector 1 attached to bracket 110 can be changed. Lifting mechanism 120 of this embodiment functions as a moving unit that moves the position (position in the direction of gravity) of bracket 110 to which projector 1 is attached in a predetermined movement direction (vertical direction, direction of gravity).

[0040] Furthermore, a shaft clamp 128 is provided on the shaft 121a of the operating handle 121. By operating and tightening the shaft clamp 128, it is possible to lock the axial rotation of the shaft 121a of the operating handle 121. After turning the operating handle 121 to set the height of the projector 1, by operating and tightening the shaft clamp 128, it is possible to fix the height of the projector 1.

[0041] In this embodiment, by changing the height of the projector 1 using the lifting mechanism 120, the distance between the projector 1 and the floor, which is the projection surface, changes, and the size of the projection image projected onto the floor can be changed. To facilitate the task of adjusting the size of the projection image projected onto the floor by changing the height of the projector 1 using the lifting mechanism 120, multiple target indicators 129b may be provided on the main body frame 101, as shown in FIG. 10 . These target indicators 129b are configured to inform the user of the corresponding image size (the size of the projection image projected onto the floor). This allows the user to easily adjust the size of the projection image projected onto the floor to a desired image size by adjusting the height of the projector 1 so that the reference position indicator 129a provided on the mount 131 supporting the bracket 110 to which the projector 1 is attached is aligned with one of the target indicators 129b on the main body frame 101.

[0042] FIG. 13 is an explanatory diagram showing the movement of the tilt adjustment mechanism 130 of this embodiment. FIG. 14 is an explanatory diagram showing the configuration of the fixing portion of the tilt adjustment mechanism 130. The tilt adjustment mechanism 130 of this embodiment includes a mount 131 and a chrysanthemum-shaped bolt 132 that serves as a fixing portion.

[0043] The mount 131 includes a mount base 131a that is disposed at a position facing the main plate 110a of the bracket 110 to which the projector 1 is attached (a position facing the bottom plate 2e of the projector 1). The mount 131 also includes two mount side portions 131b that are disposed at positions facing the two side portions 110b of the bracket 110, respectively (positions facing the left and right side plates 2c, 2d of the projector 1). Such a mount 131 can be produced, for example, by bending both ends of a single long plate-like member by 90 degrees in the longitudinal direction.

[0044] Each mount side portion 131b of the mount 131 is formed with a recess 133 that receives the engagement pin 111 provided on each side portion 110b of the bracket 110. The recess 133 is shaped to open upward and supports the engagement pin 111. By supporting each engagement pin 111 of the bracket 110 with each recess 133 of the mount 131, the bracket 110 is held rotatable around a tilt rotation axis Ot that passes through the axis of the engagement pin 111 relative to the mount 131.

[0045] Furthermore, each mount side portion 131b of the mount 131 is formed with an arc-shaped through groove 134 through which passes a bolt shaft 132a of a sanguine bolt 132 that is fastened to a fixing screw hole 112 provided in each side portion 110b of the bracket 110. This arc-shaped through groove 134 is an arc-shaped groove that follows the trajectory through which the fixing screw hole 112 of the bracket 110 passes when the bracket 110 rotates around the tilt rotation axis Ot. Therefore, when the bolt shaft 132a is passed through the arc-shaped through groove 134 of the mount 131 and the sanguine bolt 132 is attached to the fixing screw hole 112 of the bracket 110 (when the sanguine bolt 132 is loosened), the rotation range of the bracket 110 around the tilt rotation axis Ot is limited by the bolt shaft 132a being restricted by both ends of the arc-shaped through groove 134. This makes it possible to limit the rotation range of the bracket 110 around the tilt rotation axis Ot to, for example, a range in which the projector 1 attached to the bracket 110 does not come into contact with the main body frame 101.

[0046] 15 , with tilt adjustment mechanism 130 of the present embodiment, by rotating bracket 110 around tilt rotation axis Ot as shown by arrow C in the figure with chrysanthemum-shaped bolt 132 loosened, it is possible to change projection direction P of projector 1 attached to bracket 110 around tilt rotation axis Ot. Then, once projection direction P of projector 1 around tilt rotation axis Ot has been set to the desired direction, chrysanthemum-shaped bolt 132 is tightened. This fixes bracket 110 to mount 131 of tilt adjustment mechanism 130, and fixes projection direction P of projector 1 around tilt rotation axis Ot.

[0047] 15, the tilt adjustment mechanism 130 in this embodiment is positioned so that its rotation axis, the tilt rotation axis Ot, passes through the area of ​​the projector 1 attached to the bracket 110. If the tilt rotation axis Ot of the tilt adjustment mechanism were positioned outside the area of ​​the projector 1, the projector 1 would be positioned away from the tilt rotation axis Ot, and the projector 1 would move along a path that makes a large revolution around the tilt rotation axis Ot when the tilt adjustment mechanism rotates. Therefore, when the projection direction P of the projector 1 is changed around the tilt rotation axis Ot by rotating the tilt adjustment mechanism to adjust the projection image projected onto the floor (adjusting the shape of the projection image, etc.), the position of the projector 1 also changes significantly, changing the position, size, shape, etc. of the projection image, making it difficult to adjust to obtain the desired projection image.

[0048] In contrast, when the tilt rotation axis Ot is positioned so as to pass through the area of ​​the projector 1 attached to the bracket 110, as in the case of the tilt adjustment mechanism 130 of this embodiment, the position of the projector 1 is closer to the tilt rotation axis Ot than in the configuration described above. As a result, when the projection direction P of the projector 1 is changed around the tilt rotation axis Ot by rotating the tilt adjustment mechanism 130 to adjust the projection image projected on the floor surface (adjusting the shape of the projection image, etc.), the change in the position of the projector 1 is reduced. Therefore, when the projection direction P of the projector 1 is changed around the tilt rotation axis Ot to adjust the projection image on the floor surface, changes in the position, size, shape, etc. of the projection image are reduced, making it easier to make adjustments to obtain a desired projection image.

[0049] In particular, in the tilt adjustment mechanism 130 of this embodiment, the tilt rotation axis Ot is positioned so as to pass through the area where the projection optical system 15 of the projector 1 attached to the bracket 110 is located. Therefore, when adjusting the projection image projected onto the floor surface by changing the projection direction P of the projector 1 around the tilt rotation axis Ot, changes in the position, size, shape, etc. of the projection image are smaller, making it even easier to make adjustments to obtain a desired projection image.

[0050] FIG. 16 is an explanatory diagram showing the swivel mechanism 140 of this embodiment. FIG. 17 is an explanatory diagram showing the movement of the swivel mechanism 140. As shown in FIG. The swivel mechanism 140 of this embodiment includes a swivel base 141 and a swivel joint 142 .

[0051] Swivel base 141 is disposed at a position facing mount base 131a of mount 131 in tilt adjustment mechanism 130 (a position facing bottom plate 2e of projector 1). Swivel base 141 is fixed to nut bracket 124 of lifting mechanism 120 by fixing portion 127. Therefore, when nut bracket 124 is raised or lowered by lifting mechanism 120, swivel mechanism 140 and tilt adjustment mechanism 130 also rise or lower together, and projector 1 attached to bracket 110 rises or lowers.

[0052] The swivel joint 142 connects the swivel base 141 and the mount 131 of the tilt adjustment mechanism 130. The swivel joint 142 connects the mount 131 to the swivel base 141 so that the mount 131 can rotate around the swivel rotation axis Os. The swivel joint 142 has a free stop structure, and when a force exceeding the rotation locking force around the swivel rotation axis Os is applied, the mount 131 can be rotated around the swivel rotation axis Os, and when the rotation is stopped, the mount 131 is fixed to the swivel base 141 at that rotated position.

[0053] According to the swivel mechanism 140 of this embodiment, as shown in FIG. 17, by holding the projector 1 or the mount 131 attached to the bracket 110 and rotating them around the swivel rotation axis Os, the projection direction P of the projector 1 attached to the bracket 110 can be changed around the swivel rotation axis Os.

[0054] 17, the swivel mechanism 140 in this embodiment is positioned so that its swivel rotation axis Os passes through the area of ​​the projector 1 attached to the bracket 110. If the swivel rotation axis Os of the swivel mechanism were positioned outside the area of ​​the projector 1, the projector 1 would be positioned away from the swivel rotation axis Os, and the projector 1 would move along a path that would result in a large revolution around the swivel rotation axis Os when the swivel mechanism rotates. Therefore, when the projection direction P of the projector 1 is changed around the swivel rotation axis Os by rotating the swivel mechanism to adjust the projection image projected onto the floor (adjusting the shape of the projection image, etc.), the position of the projector 1 also changes significantly, changing the position, size, shape, etc. of the projection image, making it difficult to adjust to obtain the desired projection image.

[0055] In contrast, when the swivel rotation axis Os is positioned so as to pass through the area of ​​the projector 1 attached to the bracket 110, as in the case of the swivel mechanism 140 of this embodiment, the position of the projector 1 is closer to the swivel rotation axis Os compared to the configuration described above. As a result, when the projection direction P of the projector 1 is changed around the swivel rotation axis Os by rotating the swivel mechanism 140 to adjust the projection image projected on the floor surface (adjusting the shape of the projection image, etc.), the change in the position of the projector 1 is reduced. Therefore, when the projection direction P of the projector 1 is changed around the swivel rotation axis Os to adjust the projection image on the floor surface, changes in the position, size, shape, etc. of the projection image are reduced, making it easier to make adjustments to obtain a desired projection image.

[0056] In particular, in the swivel mechanism 140 of this embodiment, the swivel rotation axis Os is positioned so as to pass through the area where the projection optical system 15 of the projector 1 attached to the bracket 110 is located. Therefore, when adjusting the projection image by changing the projection direction P of the projector 1 around the swivel rotation axis Os, changes in the position, size, shape, etc. of the projection image are smaller, making it even easier to make adjustments to obtain the desired projection image.

[0057] Furthermore, in this embodiment, when adjusting the rotation angle of the projection image projected onto the floor surface (the rotation angle around a rotation axis perpendicular to the image plane), the casters 102 of the dolly 100 can be rolled to rotate the entire main body frame 101 of the dolly 100 around the rotation axis Op, as shown in Fig. 18. Alternatively, it is also possible to provide a rotation mechanism on the dolly 100 that rotates the main body frame 101 around the rotation axis Op, and adjust the rotation angle of the projection image by rotating this rotation mechanism.

[0058] At this time, the rotation axis Op can also be positioned so as to pass through the area of ​​the projector 1 attached to the bracket 110, thereby facilitating adjustments to obtain a desired projection image. In particular, if the rotation axis Op is positioned so as to pass through the area where the projection optical system 15 of the projector 1 attached to the bracket 110 is located, adjustments to obtain a desired projection image become even easier.

[0059] Furthermore, the dolly 100 of this embodiment has a support section made up of four casters 102 provided at each of the four corners of the bottom of the main frame 101 that contacts the floor surface, which is the mounting surface, and supports the dolly 100 and the projector 1 attached thereto. In this case, it is preferable to configure the projector 1 attached to the bracket 110 so that the center of gravity of the projector 1 is located vertically above an area on the floor surface surrounded by the four contact points where the four casters 102 contact the floor surface. In other words, when viewed vertically, the center of gravity of the projector 1 is located inside a rectangle connecting the floor contact points of the four casters 102 that support the projector 1 at four points.

[0060] Here, the number of contact points where the support part comes into contact with the floor surface is not limited to four, and for example, a tripod configuration with three contact points is also possible. Of course, by configuring the support part to come into contact with the floor surface at four or more contact points, the load is more distributed and stability is achieved. By distributing the load and realizing stable support, it is possible to realize a configuration that is less likely to tip over even if the position of projector 1 is raised to increase the projection distance.

[0061] When using a tripod stand configuration, a vertically movable support pillar may be provided at the connecting portion of the base of the tripod, and all or part of the lifting mechanism, tilt adjustment mechanism, and swivel mechanism, such as bracket 110 as the base portion, lifting mechanism 120 as the moving portion, tilt adjustment mechanism 130 as the rotation mechanism, and swivel mechanism 140 as the second rotation mechanism, may be provided at the top of this pillar. In particular, a tripod stand configuration makes it easier to configure the tripod to be foldable, which has the effect of further improving portability.

[0062] More preferably, the center of gravity of the projector 1 should be located on a vertical line passing through the center of gravity of the area on the floor surface surrounded by the four contact points where the four casters 102 come into contact with the floor surface, or in the vicinity thereof. In particular, it is preferable that the center of gravity of the projector 1 moves along the vertical line when adjusting the height of the projector 1 (adjusting the projection distance). With this configuration, it is possible to realize a more stable configuration that is less likely to tip over.

[0063] In a configuration that allows the projector 1 to move in the vertical direction, as in this embodiment, the projector 1 can be moved along a support column that extends in the height direction of the main frame 101 of the dolly 100. The support column that extends in the height direction of the main frame 101 can be configured to be longer than the support column that extends in the horizontal direction without impairing the ease of handling of the dolly 100. Therefore, a configuration that allows the projector 1 to move in the vertical direction easily makes it possible to widen the movement distance (movement range) of the projector 1. Therefore, the adjustment range of the projection distance with respect to the projection surface, which is the floor, can be made wider, and the adjustment range of the screen size can be made wider.

[0064] Furthermore, tilt adjustment mechanism 130 as a rotation mechanism and swivel mechanism 140 as a second rotation mechanism may be provided at a location separate from bracket 110 as a base portion.

[0065] Furthermore, the lifting range of the projector 1 by the lifting mechanism 120 is preferably equal to or greater than the size (dimensions) of the projector 1, but it may of course be equal to or smaller than the size of the projector 1. The lifting mechanism may be a mechanism capable of fine adjustment to convert the feed of the microhead into the vertical direction, or may be driven by an electric motor.

[0066] Furthermore, the dolly 100 does not have to be placed on the same floor surface as the projection surface, but may be placed on a surface other than the projection surface, such as a desk or a platform.

[0067] The above description is merely an example, and each of the following aspects provides unique effects. [First aspect] The first aspect is a projection image adjustment device (e.g., a cart 100) comprising a base portion (e.g., a bracket 110) to which a projection device (e.g., a projector 1) is attached, and a moving portion (e.g., an elevating mechanism 120) that moves the position of the base portion in a predetermined moving direction (e.g., a vertical direction), characterized in that it has a rotation mechanism (e.g., a tilt adjustment mechanism 130) that rotates the projection device around a rotation axis (e.g., a tilt rotation axis Ot) perpendicular to a plane that includes the moving direction and the projection direction P of the projection device, and the rotation axis is positioned so as to pass through the area of ​​the projection device attached to the base portion. In conventional projection image adjustment devices, the rotation axis used to rotate the projection device to change its projection direction is located far away from the projection device's area. Therefore, when the projection device is rotated, the position of the projection device also changes significantly. As a result, when adjusting the position, size, shape, rotation angle (rotation angle around the rotation axis perpendicular to the image surface) of the projection image projected onto the projection surface, for example, even if you want to adjust the projection image by changing only the projection direction of the projection device, the position of the projection device also changes, making it difficult to adjust the projection image to the desired size. According to this aspect, the projection image can be adjusted by moving the position of the base unit in a predetermined movement direction using the movement unit and rotating the projection device around a rotation axis perpendicular to a plane including the movement direction and the projection direction of the projection device using the rotation mechanism. In this case, since the rotation axis of the rotation mechanism is positioned so as to pass through the area of ​​the projection device attached to the base unit, the amount of change in the position of the projection device relative to the amount of change in the rotation angle of the rotation mechanism can be made smaller than in conventional projection image adjustment devices. Therefore, according to this aspect, when the projection device is rotated by the rotation mechanism to change the projection direction, the associated change in position of the projection device can be made smaller, making it easier to adjust the projection image.

[0068] [Second mode] The second aspect is characterized in that in the first aspect, the rotation axis is positioned so as to pass through an area where the projection optical system 15 of the projection device is disposed. According to this aspect, when the projection device is rotated by the rotation mechanism to change the projection direction, the associated change in position of the projection device can be further reduced, making it even easier to adjust the projection image.

[0069] [Third aspect] The third aspect is characterized in that, in the first or second aspect, there is provided a second rotation mechanism (e.g., swivel mechanism 140) that rotates the projection device around a second rotation axis (e.g., swivel rotation axis Os) perpendicular to a second plane that includes the movement direction and a direction perpendicular to the plane. This allows the projection direction of the projection device to be adjusted in two dimensions by combining the rotation of the rotation mechanism and the rotation of the second rotation mechanism, thereby increasing the degree of freedom in adjusting the projection image.

[0070] [Fourth aspect] A fourth aspect is the third aspect, characterized in that the second rotation axis is positioned so as to pass through an area of ​​a projection device attached to the base portion. According to this aspect, when the projection device is rotated by the second rotation mechanism to change the projection direction, the associated change in position of the projection device can also be reduced, making it easier to adjust the projection image.

[0071] [Fifth mode] A fifth aspect is the fourth aspect, characterized in that the second rotation axis is positioned so as to pass through an area where a projection optical system of the projection device is disposed. According to this aspect, when the projection device is rotated by the second rotation mechanism to change the projection direction, the associated change in position of the projection device can be further reduced, making it even easier to adjust the projection image.

[0072] [Sixth aspect] A sixth aspect is characterized in that, in any of the first to fifth aspects, the moving unit moves the position of the base unit in a moving direction (e.g., vertical direction) that changes the distance between the projection device attached to the base unit and a projection surface (e.g., a floor surface) onto which the projection light from the projection device is projected. This allows the size of the projection image projected onto the projection surface to be changed by moving the moving section, thereby adjusting the projection image.

[0073] [Seventh aspect] A seventh aspect is the sixth aspect, characterized in that the moving section moves the position of the base section in the direction of gravity. This makes it possible to adjust the size of the projection image by moving the moving part when a projection image is projected onto a horizontal plane such as a floor or ceiling as the projection surface.

[0074] [Eighth aspect] An eighth aspect is the seventh aspect, wherein the moving section moves the position of the base section in the gravity direction in a direction against gravity when increasing the distance. This makes it possible to adjust the size of the projection image by moving the moving part when the projection image is projected onto the floor surface as the projection surface.

[0075] [Ninth aspect] The ninth aspect is the eighth aspect, characterized in that the projection image adjustment device has a support part (e.g., four casters 102) that contacts the mounting surface on which the projection image adjustment device is placed at three or more contact points and supports the projection image adjustment device, and the center of gravity of the projection device attached to the base part is located vertically above the area on the mounting surface surrounded by the three or more contact points. This makes it possible to obtain a stable projection image adjustment device that is less likely to tip over even when the projection device is moved to a high position away from the placement surface.

[0076] [Tenth aspect] A tenth aspect is an image projection system having a projection device (e.g., projector 1) and a projection image adjustment device (e.g., dolly 100) that adjusts the projection image projected from the projection device onto a projection surface, wherein the projection image adjustment device is the projection image adjustment device of the eighth or ninth aspect, and the projection ratio of the projection device is 0.18 or more and 0.5 or less. This makes it possible to project a large screen size of, for example, over 300 inches when projecting an image onto the floor surface, even within a specified upper height limit (for example, a height that can be used indoors with a ceiling, a height that ensures ease of handling (operability) for the user, etc.).

[0077] [Eleventh aspect] An eleventh aspect is the tenth aspect, characterized in that the projection ratio of the projection device is 0.2 or more and 0.3 or less. This makes it easy to project a large-screen image, for example, exceeding 300 inches, even within a predetermined upper height range when projecting an image onto the floor as the projection surface. [Explanation of symbols]

[0078] 1: Projector 2: Housing 3: Projection window 15: Projection optical system 100: Cart 101: Main frame 102: Caster 110: Bracket 111: Engagement pin 112: Fixing screw hole 115: Fixing screw 120: Lifting mechanism 121: Operating handle 122: Joint part 123: Lifting screw 124: Nut bracket 125: Guide rail 126: Guide section 127:Fixed part 128: Shaft clamp 129a: Reference position index 129b :Target indicator 130: Tilt adjustment mechanism 131: Mount 132: Chrysanthemum bolt 132a: Bolt shaft 133: Recess 134:Through-hole arc groove 140: Swivel mechanism 141: Swivel base 142: Swivel joint 200: Screen Os: Swivel axis Ot: Tilt rotation axis P: Projection direction [Prior art documents] [Patent documents]

[0079] [Patent Document 1] International Publication No. 2017 / 209173

Claims

1. a base portion to which a projection device is attached; a moving unit that moves the position of the base unit in a predetermined moving direction, a rotation mechanism that rotates the projection device around a rotation axis that is perpendicular to a plane that includes the movement direction and the projection direction of the projection device; A projection image adjustment device, wherein the rotation axis is positioned so as to pass through an area of ​​a projection device attached to the base portion.

2. 2. The projection image adjustment device according to claim 1, A projection image adjustment device, wherein the rotation axis is positioned so as to pass through an area where a projection optical system of the projection device is disposed.

3. 3. The projection image adjustment device according to claim 1, a second rotation mechanism for rotating the projection device around a second rotation axis perpendicular to a second plane that includes the movement direction and a direction perpendicular to the plane;

4. 4. The projection image adjustment device according to claim 3, The projection image adjustment device, wherein the second rotation axis is positioned so as to pass through an area of ​​a projection device attached to the base portion.

5. 5. The projection image adjustment device according to claim 4, The projection image adjustment device is characterized in that the second rotation axis is positioned so as to pass through an area where a projection optical system of the projection device is disposed.

6. 3. The projection image adjustment device according to claim 1, A projection image adjustment device characterized in that the moving unit moves the position of the base unit in a moving direction that changes the distance between the projection device attached to the base unit and the projection surface onto which the projection light from the projection device is projected.

7. 7. The projection image adjustment device according to claim 6, The projection image adjusting device, wherein the moving unit moves the position of the base unit in the direction of gravity.

8. 8. The projection image adjustment device according to claim 7, The projection image adjusting device, wherein the moving section moves the position of the base section in the direction of gravity in a direction against gravity when the distance is to be increased.

9. 9. The projection image adjustment device according to claim 8, a support portion that supports the projection image adjustment device by contacting the mounting surface on which the projection image adjustment device is placed at three or more contact points; A projection image adjustment device, characterized in that the center of gravity of the projection device attached to the base portion is located vertically above an area on the placement surface that is surrounded by the three or more contact points.

10. A projection device; and a projection image adjustment device that adjusts a projection image projected from the projection device onto a projection surface, The projection image adjustment device is the projection image adjustment device according to claim 8, An image projection system, characterized in that the projection ratio of the projection device is 0.18 or more and 0.5 or less.

11. 11. The image projection system according to claim 10, An image projection system, characterized in that the projection ratio of the projection device is 0.2 or more and 0.3 or less.

Images