Projection system

Abstract

To provide a projection system capable of improving ease of use.SOLUTION: A projection system 100 is used at construction sites. The projection system 100 includes: a tripod 3, a first case 10, a projection unit, a second case 20, and a projection control unit. The tripod 3 has a tripod body 30. The tripod body 30 includes a first leg 31, a second leg 32, a third leg 33, and a pedestal 34. The first case 10 is supported by the pedestal 34 of the tripod body 30. The projection unit is held or housed by the first case 10. The projection unit projects images onto a projected surface of a construction site. The projection control unit is held or housed by the second case 20. The projection control unit controls the operation of the projection unit. The tripod 3 also has a support part 35. The support part 35 is held by the tripod body 30. The support part 35 supports the second case 20 so that at least a part of the second case 20 is located within the triangular pyramid-shaped space S1 formed by the tripod body 30.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present disclosure relates to a projection system, and more particularly to a projection system including a tripod that supports a projection portion. [Background technology]

[0002] Patent Document 1 describes a projection device that can display an image superimposed on a real object. The projection device includes a projector, multiple cameras, and a control unit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2015-100052 Summary of the Invention [Problem to be solved by the invention]

[0004] Projection systems such as the projection device described in Patent Document 1 are difficult to carry around, and there is room for improvement in terms of usability.

[0005] An object of the present disclosure is to improve the usability of projection systems. [Means for solving the problem]

[0006] A projection system according to one embodiment of the present disclosure is used at a construction site. The projection system comprises a tripod, a first housing, a projection unit, a second housing, and a projection control unit. The tripod has a tripod body. The tripod body includes a first leg, a second leg, a third leg, and a base. The first housing is supported by the base of the tripod body. The projection unit is held or housed in the first housing. The projection unit projects an image onto a projection surface at the construction site. The projection control unit is held or housed in the second housing. The projection control unit controls the operation of the projection unit. The tripod further has a support unit held by the tripod body. The support unit supports the second housing so that at least a portion of the second housing is located within a triangular pyramid-shaped space formed by the tripod body. [Effects of the Invention]

[0007] The present disclosure has the advantage that it is possible to improve the usability of the projection system. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a diagram illustrating a usage form of a projection system according to an embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view of the projection system. [Figure 3] FIG. 3 is a block diagram of the projection system. [Figure 4] FIG. 4 is a top view of the control unit and tripod included in the projection system. [Figure 5] FIG. 5 is a perspective view of the main part of the projection system with the tripod legs in an open position. [Figure 6] FIG. 6 is a side view of the main part of the projection system in the closed state of the tripod. [Figure 7] FIG. 7 is a perspective view of the vicinity of the support base of the stay when the tripod of the projection system is in a closed state. [Figure 8] FIG. 8 is a bottom view of the vicinity of the support base of the stay in the projection system. [Figure 9]FIG. 9 is a schematic side view of the vicinity of the support base of the stay in the projection system. [Figure 10] FIG. 10 is a schematic front view of the projection system. [Figure 11] FIG. 11 is a bottom view of the stay and its surroundings in the projection system of the first modified example. [Figure 12] FIG. 12 is a perspective view of the periphery of the stay in the projection system of the second modification, as viewed from below. [Figure 13] FIG. 13 is a perspective view of another example of a guide member in the projection system. [Figure 14] FIG. 14 is a perspective view of a projection system according to the third modification. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a projection system according to an embodiment of the present disclosure will be described with reference to the accompanying drawings. However, the embodiment described below is merely one of various embodiments of the present disclosure. The embodiment described below can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. Furthermore, each figure described in the embodiment described below is a schematic diagram, and the ratios of the sizes and thicknesses of the components in the figures do not necessarily reflect the actual dimensional ratios.

[0010] (1) Implementation form (1.1) Overview The projection system 100 of this embodiment is a system for projecting an image onto a projection surface 101 (see FIG. 1 ) at a construction site. The projection surface 101 may be, for example, a floor, wall, or ceiling surface of a building under construction. The image projected by the projection system 100 is an image for assisting construction work. The image projected by the projection system 100 may be, for example, light indicating the position to drive a bolt on a floor or light indicating the position to drive a screw on a wall. In other words, the projection system 100 projects light that assists in marking out as an image. The image projected by the projection system 100 may be a single light spot, or may include multiple light spots, or may include one or more straight lines and / or curves. By using the projection system 100, the worker does not need to identify the work position himself, thereby improving the efficiency of construction work.

[0011] At a construction site, bolts, screws, and the like need to be driven in various locations. Therefore, during the construction of a building, images are projected while the projection system is moved to a desired location within the construction site as needed. However, in conventional projection systems, the housing containing the control unit and the housing containing the projection unit are separate and placed separately on the floor within the construction site. Therefore, when moving the projection system, multiple people need to carry the multiple components of the projection system, or one person needs to make multiple trips back and forth to carry them.

[0012] In order to solve these problems, a projection system 100 of this embodiment used at a construction site includes a tripod 3, a first housing 10, a projection unit 11, a second housing 20, and a projection control unit 211, as shown in FIGS. 1 to 3 . The tripod 3 has a tripod main body 30. The tripod main body 30 includes a first leg 31, a second leg 32, a third leg 33, and a base 34. The first housing 10 is supported by the base 34. The projection unit 11 is held or housed in the first housing 10. The projection unit 11 projects an image onto a projection surface 101 at the construction site. The projection control unit 211 is held or housed in the second housing 20. The projection control unit 211 controls the operation of the projection unit 11. The tripod 3 further includes a support unit 35 held by the tripod main body 30. The support portion 35 supports the second housing 20 so that at least a portion of the second housing 20 is positioned within a triangular pyramid-shaped space S1 formed by the tripod main body 30.

[0013] In the projection system 100 of this embodiment, the first housing 10 that holds or houses the projection unit 11 and the second housing 20 that holds or houses the projection control unit 211 are supported integrally by the tripod 3. This allows a user to carry the entire projection system 100 by themselves, for example, by holding the tripod body 30 of the tripod 3. This makes it easier to carry the projection system 100 at a construction site where the installation location of the projection unit 11 is frequently moved, improving the usability of the projection system 100.

[0014] (1.2) Details The projection system 100 of this embodiment will be described in more detail below with reference to FIGS.

[0015] As shown in FIG. 2, the projection system 100 of this embodiment includes a projection unit 1, a control unit 2, and a tripod 3.

[0016] (1.2.1) Projection unit As shown in FIGS. 2 and 3, the projection unit 1 includes a first housing 10, a projection unit 11, a distance measurement unit 12, a rotation unit 13, and an angle measurement unit 14.

[0017] The projection unit 11 is a projection module for projecting an image onto a projection surface 101 at a construction site. As shown in FIG.

[0018] The light source 111 includes, for example, a laser light source. The laser light source is, for example, a semiconductor laser (laser diode). However, the light source is not limited to this, and the light source 111 may include an LED or the like. The light source 111 may be configured to emit monochromatic light, or may include multiple light-emitting elements and be able to emit light of multiple colors.

[0019] Scanning unit 112 includes, for example, a MEMS (Micro Electro Mechanical Systems) mirror, a galvanometer mirror, etc. Scanning unit 112 scans the light emitted by light source 111 and projects it onto projection surface 101 at a desired position.

[0020] The distance measuring unit 12 measures the distance from the projection unit 1 (first housing 10) to the projection surface 101. The distance measuring unit 12 includes a distance measuring light source such as an infrared light source or a visible light source, and a light receiving element such as a photodiode. The distance measuring unit 12 may be a distance measuring sensor such as a TOF (Time of Flight) sensor. However, the distance measuring unit 12 is not limited to this, and may be a distance measuring sensor using a method other than the TOF method, such as a triangulation method. The positional relationship between the projection unit 11 and the distance measuring unit 12 is not limited to the position shown in FIG. 2, and the positional relationship may be changed.

[0021] As shown in FIG. 2, the first housing 10 is box-shaped. The first housing 10 may be made of resin or metal. The first housing 10 holds or houses the projection unit 11 and the distance measurement unit 12. Here, the first housing 10 houses the projection unit 11 so that the light-emitting surface of the light source 111 of the projection unit 11 is exposed forward. The first housing 10 also houses the distance measurement unit 12 so that the light-emitting surface of the distance measurement light source of the distance measurement unit 12 is exposed forward.

[0022] The first housing 10 is supported by a base 34 of the tripod main body 30 of the tripod 3. Here, the first housing 10 is supported by the base 34 of the tripod main body 30 via a rotating portion 13.

[0023] The rotating unit 13 rotates the first housing 10 relative to the base 34 .

[0024] The rotation unit 13 is a rotation mechanism for changing the orientation of the first housing 10 (that is, the orientation and angle of the projection unit 11 and the distance measurement unit 12).

[0025] As shown in Figures 2 and 3, the rotation unit 13 has a first support 131, a second support 132, a first rotation drive unit 133 for changing the orientation of the first housing 10 in the pan direction, and a second rotation drive unit 134 for changing the orientation of the first housing 10 in the tilt direction.

[0026] The first support body 131 is box-shaped. The first support body 131 is supported by the base 34 of the tripod body 30. The first support body 131 is fixed to the base 34 of the tripod body 30.

[0027] The second support 132 has a U-shaped box shape when viewed from the front. The second support 132 is supported on the upper surface of the first support 131 so as to be rotatable relative to the first support 131 around a first axis X1 (vertical axis).

[0028] The second support 132 supports the first housing 10. The first housing 10 is disposed within the space of the U-shaped second support 132. The first housing 10 is supported by the second support 132 so as to be rotatable around a second axis X2 (horizontal axis) relative to the second support 132.

[0029] The first rotation drive unit 133 includes, for example, a stepping motor. The first rotation drive unit 133 rotates the second support 132 relative to the first support 131.

[0030] The second rotation drive unit 134 includes, for example, a stepping motor. The second rotation drive unit 134 rotates the first housing 10 relative to the second support 132.

[0031] The angle measurement unit 14 measures the orientation of the first housing 10 (i.e., the orientation and angle of the projection unit 11 and the distance measurement unit 12). The angle measurement unit 14 is an angle sensor that measures the drive amounts of the first rotation drive unit 133 and the second rotation drive unit 134. That is, the angle measurement unit 14 measures the rotation angle of the rotation unit 13. The angle measurement unit 14 includes a first angle measurement unit 141 that measures the rotation angle of the first rotation drive unit 133 that rotates in the pan direction, and a second side angle unit 142 that measures the rotation angle of the second rotation drive unit 134 that rotates in the tilt direction. Note that the angle measurement unit 14 may be realized by a rotation control unit 212 that controls the stepping motor of the first rotation drive unit 133 and the stepping motor of the second rotation drive unit 134. In this case, the angle measurement unit 14 is provided in the control unit 2.

[0032] (1.2.2) Control unit 2 and 3, the control unit 2 includes a second housing 20, a processing unit 21, and a battery 22. The control unit 2 is connected to the projection unit 1 via a cable 4 in a wired manner.

[0033] The second housing 20 has, for example, a rectangular box shape. The second housing 20 holds or houses the processing unit 21 and the battery 22. The second housing 20 may be made of resin or metal. An operation unit (switch, button, etc.) that accepts operations from the user may be provided on the front surface of the second housing 20.

[0034] The processing unit 21 is mainly composed of a computer system having one or more processors and one or more memories. In the processing unit 21, the one or more processors execute a program recorded in the memory, thereby realizing the functions of the processing unit 21. The program may be pre-recorded in the memory, may be provided via a telecommunications line such as the Internet, or may be recorded on a non-transitory recording medium such as a memory card and provided.

[0035] 3, the processing unit 21 includes a projection control unit 211, a rotation control unit 212, and a correction unit 213. That is, the processing unit 21 realizes the functions of the projection control unit 211, the rotation control unit 212, and the correction unit 213.

[0036] The projection control unit 211 controls the operation of the projection unit 11. Based on projection data provided from an external device and recorded in the memory of the processing unit 21, the projection control unit 211 controls the on / off of the light source 111 and the operation of the scanning unit 112, causing the projection unit 11 to project an image onto the projection surface 101.

[0037] The rotation control unit 212 controls the operation of the rotation unit 13. The rotation control unit 212 controls the operation of the stepping motors of the first rotation drive unit 133 and the second rotation drive unit .

[0038] The correction unit 213 corrects the image projected from the projection unit 11 using the distance measured by the distance measurement unit 12 and the rotation angle measured by the angle measurement unit 14 .

[0039] Specifically, for each of three arbitrary points on the projection surface 101 (for example, a floor surface) that are not aligned in a straight line, the correction unit 213 acquires a set (measurement data) of the distance from the first housing 10 (the distance measurement light source of the distance measurement unit 12) to the point and the rotation angle (pan angle and tilt angle) of the rotation unit 13 in a state in which the distance measurement light source emits light toward the point. That is, for a first arbitrary point on the projection surface 101, the correction unit 213 acquires a set (first measurement data) of the distance from the first housing 10 to the first point and the rotation angle of the rotation unit 13 at that time. Furthermore, for a second arbitrary point on the projection surface 101, the correction unit 213 acquires a set (second measurement data) of the distance from the first housing 10 to the second point and the rotation angle of the rotation unit 13 at that time. Furthermore, for any third point on projection surface 101 that is not on the line connecting the first and second points, correction unit 213 acquires a set (third measurement data) of the distance from first housing 10 to the third point and the rotation angle of rotation unit 13 at that time. Then, correction unit 213 uses the first measurement data to the third measurement data to determine a virtual plane that includes the first point to the third point. If projection surface 101 is flat, it can be said that the determined virtual plane represents projection surface 101. Note that if the position of distance measurement unit 12 is deviated from the center of rotation in the pan direction and the center of rotation in the tilt direction (i.e., the origin), the virtual plane determined by correction unit 213 may be deviated from the actual projection surface 101. Correction unit 213 determines the virtual plane that represents projection surface 101, taking this deviation into account.

[0040] The correction unit 213 corrects the image projected from the projection unit 11 based on the calculated virtual plane. The correction unit 213 also corrects the image projected from the projection unit 11, taking into consideration that the position of the light source 111 of the projection unit 11 and the position of the distance measurement light source of the distance measurement unit 12 are different within the first housing 10. The projection control unit 211 causes the projection unit 11 to project the image corrected by the correction unit 213 onto the projection surface 101.

[0041] The control unit 2 is provided with the correction unit 213, which makes it possible to correct distortion of the image projected onto the projection surface 101, and to project an appropriate image onto the projection surface 101.

[0042] The battery 22 is a power source for the projection system 100. The battery 22 may be a primary battery or a secondary battery. The battery 22 supplies power to the projection unit 1. The battery 22 also supplies power to the processing unit 21.

[0043] (1.2.3) Tripod As shown in FIG. 2, the tripod 3 includes a tripod body 30 and a support portion 35 .

[0044] The tripod body 30 includes a first leg 31, a second leg 32, a third leg 33, and a base 34.

[0045] The first to third legs 31 to 33 have the same shape. Each of the first to third legs 31 to 33 has a rod-shaped main body 300, a support leg 301 rotatably connected to a first end of the main body 300 and placed on an installation surface G1 (the ground, floor, etc.; see FIG. 10), and a connecting part 302 provided at a second end of the main body 300 and rotatably connected to the base 34.

[0046] The connecting portions 302 of the first to third legs 31 to 33 connect the main bodies 300 of the first to third legs 31 to 33 to the base 34 so that the first to third legs 31 to 33 can be displaced relative to the base 34 between an open leg state (see FIGS. 2 and 5) and a closed leg state (see FIG. 6). In the open leg state, as shown in FIGS. 2 and 4, a virtual triangular pyramid-shaped space S1 is formed by the first to third legs 31 to 33 of the tripod body 30. In the closed leg state, as shown in FIG. 6, the longitudinal directions of the main bodies 300 of the first to third legs 31 to 33 are aligned with each other.

[0047] The pedestal 34 is a portion that supports the first housing 10 of the projection unit 1. Here, the pedestal 34 supports the first housing 10 via the first support 131 and second support 132 of the rotating unit 13. The first support 131 of the rotating unit 13 is fixed to the upper surface of the pedestal 34, for example.

[0048] As shown in FIG. 4 , the base 34 is located at the center of the first to third legs 31 to 33 in a top view. Therefore, by being supported by the base 34, the first housing 10 is supported by the tripod body 30 so that the center of gravity of the first housing 10 is located within an imaginary triangle T1 connecting three points (support leg portions 301) where the first to third legs 31 to 33 each come into contact with the installation surface G1 in a top view. More specifically, the tripod body 30 holds the first housing 10 so that the center of gravity of the first housing 10 overlaps with the base 34 in a top view. In other words, the tripod body 30 holds the first housing 10 so that the center of gravity of the first housing 10 coincides with the center of gravity of the imaginary triangle T1 in a top view. This makes it less likely for the tripod 3 to tip over or other problems to occur when the first housing 10 is supported by the tripod body 30. It should be noted that "the position of the center of gravity of the first housing 10 when viewed from above" refers to the center of gravity of the figure formed by the outline of the first housing 10 when viewed from above. It should be noted that the center of gravity of the first housing 10 does not have to coincide with the position of the center of gravity of the imaginary triangle T1, as long as it is within the imaginary triangle T1.

[0049] In the projection system 100, it is preferable that the tripod main body 30 supports the first housing 10 so that the center of gravity of the projection unit 1 is located within the imaginary triangle T1 when viewed from above. Note that the "center of gravity of the projection unit 1" refers to the point of action of the resultant force of gravity acting on the projection unit 1.

[0050] The support portion 35 is held by the tripod main body 30. The support portion 35 supports the second housing 20 of the control unit 2.

[0051] 2 and 5 to 7, the support portion 35 includes a stay 36 that is held by the tripod main body 30. The second housing 20 is attached to the stay 36 in a detachable manner.

[0052] As shown in FIGS. 2 and 5, the stay 36 includes three arms 360 and a support base 364 .

[0053] 2 and 5, the three arms 360 have the same shape. Each of the three arms 360 is long and has a first end and a second end. Each of the three arms 360 is a long groove with an open top. Each of the three arms 360 has a bottom wall 358 and a pair of side walls 359 rising from both side edges of the bottom wall 358.

[0054] First ends of the three arms 360 are respectively connected to the first leg 31 to the third leg 33 of the tripod main body 30. The first ends of the three arms 360 are respectively connected to the first leg 31 to the third leg 33 of the tripod main body 30 via first rotary connectors 351 that rotate around a rotation axis along the width direction of the arms 360.

[0055] The second ends of the three arms 360 are connected to a support base 364 via second rotary connectors 352 that rotate around a rotation axis along the width direction of the arms 360.

[0056] Hereinafter, the three arms 360 of the stay 36 will also be referred to as a first arm 361, a second arm 362, and a third arm 363. The first arm 361 to the third arm 363 are connected to the first leg 31 to the third leg 33, respectively.

[0057] The support base 364 is a portion of the stay 36 on which the second housing 20 of the control unit 2 is placed. The upper surface of the support base 364 is flat. The support base 364 is in the shape of a triangular platform when viewed from above. The second ends of the three arms 360 are respectively connected to three sides of the support base 364. Two parallel notches are formed in each side of the support base 364, and the side walls 359 of the corresponding arms 360 are positioned in these two notches.

[0058] When the tripod main body 30 is placed on the installation surface G1 in the spread-leg state (see FIGS. 2 and 5), the three arms 360 of the stay 36 and the support base 364 are positioned on an imaginary plane parallel to the installation surface G1 (see FIG. 10). In this state, the second housing 20 is placed on the support base 364, so that the support parts 35 (stays 36) can support the second housing 20.

[0059] On the other hand, when the tripod main body 30 is transformed from the open leg state to the closed leg state without the second housing 20 placed thereon, the first arm 361 to the third arm 363 of the stay 36 are displaced to positions along the main body 300 of the first leg 31 to the third leg 33, respectively (see FIGS. 6 and 7). In this way, the stay 36 can be folded together with the tripod main body 30. Because the stay 36 can be folded together with the tripod main body 30, the tripod 3 can be easily set up and put away. Furthermore, the storage space required when the tripod 3 is not in use can be reduced.

[0060] As shown in FIGS. 5 and 8, the support base 364 has a through-hole 365 at its center that penetrates vertically. The second housing 20 can be fixed to the support base 364 by passing a fixing screw 51 through this through-hole 365 from below and screwing it to the underside of the second housing 20 supported on the support base 364 (see FIG. 9). In this way, the projection system 100 is provided with a fixing portion 5 that fixes the second housing 20 to the stay 36 (support base 364). The fixing portion 5 includes a fixing screw 51 that fixes the support base 364 of the stay 36 to the second housing 20. Since the projection system 100 is provided with the fixing portion 5, the second housing 20 is less likely to fall off the support portion 35, making the projection system 100 even easier to carry.

[0061] 2 and 4 , the support portion 35 supports the second housing 20 so that at least a portion of the second housing 20 is located within the triangular pyramid-shaped space S1 formed by the tripod main body 30. Here, the support portion 35 supports the second housing 20 so that the entire second housing 20 is located within the triangular pyramid-shaped space S1 formed by the tripod main body 30.

[0062] As shown in FIG. 4 , the support unit 35 supports the second housing 20 so that the center of gravity of the second housing 20 is located within an imaginary triangle T1 connecting three points (support leg 301) where the first to third legs 31 to 33 contact the installation surface G1 in a top view. More specifically, the support unit 35 (stay 36) supports the second housing 20 so that the center of gravity of the second housing 20 overlaps with the support base 364 in a top view. In other words, the support unit 35 holds the second housing 20 so that the center of gravity of the second housing 20 coincides with the center of gravity of the imaginary triangle T1 in a top view. This makes it less likely that the tripod 3 will tip over or other problems will occur when the second housing 20 is held by the support unit 35. Note that the "center of gravity of the second housing 20 in a top view" refers to the center of gravity of a figure formed by the outline of the second housing 20 when the second housing 20 is viewed from above.

[0063] The support part 35 preferably supports the second housing 20 so that the center of gravity of the control unit 2 is located within the imaginary triangle T1 in a top view. Note that the "center of gravity of the control unit 2" refers to the point of action of the resultant force of gravity acting on the control unit 2.

[0064] Furthermore, in the projection system 100 of this embodiment, the support section 35 supports the second housing 20 so that the entire second housing 20 is positioned within the imaginary triangle T1 in top view. This makes it even more unlikely that problems such as the tripod 3 tipping over will occur.

[0065] As shown in Fig. 10, when the tripod main body 30 is placed on the installation surface G1, the support portion 35 supports the second housing 20 so that the height H1 of the underside 201 of the second housing 20 from the installation surface G1 is a predetermined height. The "predetermined height" can be, for example, a value within a range of 50 cm to 120 cm. By supporting the second housing 20 at the predetermined height (50 cm to 120 cm) from the installation surface G1, the user can operate the operating unit of the second housing 20 and replace the battery 22 while standing, thereby reducing the workload on the user.

[0066] As described above, in the projection system 100 of this embodiment, the first housing 10 that holds or houses the projection unit 11 is supported by the tripod 3 (tripod main body 30). Furthermore, the second housing 20 that holds or houses the processing unit 21 (projection control unit 211) is supported by the tripod 3 (supporting part 35) so that at least a portion of the second housing 20 is located within the triangular pyramid-shaped space S1. Therefore, when moving the projection system 100, a user can carry the entire projection system 100 (projection unit 1 and control unit 2) by themselves, for example, while holding the tripod main body 30. This makes it easier to carry the projection system 100, improving the usability of the projection system 100.

[0067] (2) Variations The above embodiment is merely one of various embodiments of the present disclosure. Modifications of the embodiment are listed below. The above embodiment and the modifications described below can be applied in appropriate combinations.

[0068] The processing unit 21 in the present disclosure includes a computer system. The computer system is primarily composed of a processor and memory as hardware. The processor executes a program stored in the memory of the computer system to realize the functions of the processing unit 21 in the present disclosure. The program may be pre-stored in the memory of the computer system, provided via a telecommunications line, or provided in a non-transitory recording medium such as a memory card, optical disk, or hard disk drive that is readable by the computer system. The processor of the computer system is composed of one or more electronic circuits, including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits, such as ICs and LSIs, are referred to by different names depending on the degree of integration, and include integrated circuits called system LSIs, very large-scale integrations (VLSIs), and ultra-large-scale integrations (ULSIs). Furthermore, field-programmable gate arrays (FPGAs), which are programmed after the LSI is manufactured, or logic devices that allow the reconfiguration of internal connections or circuit partitions within the LSI, can also be used as processors. Multiple electronic circuits may be integrated on a single chip or distributed across multiple chips. The multiple chips may be integrated into one device or distributed across multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller also comprises one or more electronic circuits, including semiconductor integrated circuits or large-scale integrated circuits.

[0069] (2.1) Variation 1 A projection system 100 of this modified example will be described with reference to FIG.

[0070] In the projection system 100 of this modified example, a protrusion 202 that protrudes downward is provided on the underside 201 of the second housing 20. The protrusion 202 is provided with a through-hole 203 that penetrates in a direction perpendicular to the protruding direction. The protrusion 202 is fitted into a groove of one of the three arms 360 of the stay 36. In addition, a through-hole is formed in each of both side walls 359 of the arm 360. Then, a fixing pin 52 is inserted into the through-holes in both side walls 359 of the arm 360 and the through-hole 203 in the protrusion 202, thereby fixing the second housing 20 to the support part 35 (stay 36).

[0071] Thus, in the projection system 100 of this modified example, the fixing part 5 includes the fixing pin 52 that is inserted so as to penetrate through (the through-holes in the side walls 359 of) the arm part 360 of the stay 36 and (the through-hole 203 of) the protrusion 202. The fixing part 5 of this modified example also makes it difficult for the second housing 20 to fall off from the support part 35, making it even easier to carry the projection system 100.

[0072] The number of protrusions 202 is not particularly limited, and for example, three protrusions 202 may be provided on the lower surface 201 of the second housing 20, which are fitted into the grooves of the three arms 360 of the stay 36, respectively. A fixing pin 52 may be inserted into each of the three protrusions 202.

[0073] (2.2) Variation 2 A projection system 100 of this modified example will be described with reference to FIG.

[0074] The projection system 100 of this modified example includes a guide portion 6 provided on the lower surface 201 of the second housing 20. The guide portion 6 guides the attachment of the second housing 20 to the support portion .

[0075] As shown in FIG. 12, the guide portion 6 includes three guide members 60 mounted on the three arm portions 360 of the stay 36, respectively.

[0076] The guide member 60 is a C-shaped member with an open bottom surface. The width of the open space of the guide member 60 (the distance between both side walls) is greater than the distance between the outer surfaces of both side walls 359 of the arm portion of the stay 36. In other words, the guide member 60 has a groove on its bottom surface that is wider than the width of the arm portion 360 of the stay 36.

[0077] According to the projection system 100 of this modified example, when the second housing 20 is supported by the stay 36, it is possible to easily perform positioning.

[0078] The shape of the guide member 60 is not limited to a C-shape, and may be, for example, an L-shape as shown in Fig. 13. In this example, the guide member 60 also has a groove (a groove with one side open) on the lower surface that is wider than the width of the arm portion 360.

[0079] (2.3) Variation 3 A projection system 100 of this modified example will be described with reference to FIG.

[0080] The projection system 100 of this modified example further includes a fall prevention cable 7. Here, the fall prevention cable 7 connects the first support 131 of the rotating unit 13 and the second housing 20. The fall prevention cable 7 prevents the second housing 20 from falling off the support unit 35.

[0081] According to the projection system 100 of this modified example, the second housing 20 can be prevented from falling off the support portion .

[0082] The fall prevention cable 7 may be connected to the base 34 of the tripod 3, the support base 364, the first housing 10, or the like.

[0083] (3) Mode As is clear from the above-described embodiments and modifications, the present specification discloses the following aspects.

[0084] A projection system (100) of a first embodiment is used at a construction site. The projection system (100) includes a tripod (3), a first housing (10), a projection unit (11), a second housing (20), and a projection control unit (211). The tripod (3) has a tripod body (30). The tripod body (30) includes a first leg (31), a second leg (32), a third leg (33), and a base (34). The first housing (10) is supported by the base (34) of the tripod body (30). The projection unit (11) is held or housed in the first housing (10). The projection unit (11) projects an image onto a projection surface (101) at the construction site. The projection control unit (211) is held or housed in the second housing (20). The projection control unit (211) controls the operation of the projection unit (11). The tripod (3) further has a support portion (35). The support portion (35) is held by the tripod main body (30). The support portion (35) supports the second housing (20) so that at least a portion of the second housing (20) is located within a triangular pyramid-shaped space (S1) formed by the tripod main body (30).

[0085] According to this embodiment, the projection system (100) can be easily carried around the construction site, improving the usability of the projection system (100).

[0086] In the projection system (100) of the second aspect, in the first aspect, the tripod body (30) supports the first housing (10) so that the center of gravity of the first housing (10) is located within an imaginary triangle (T1) connecting the three points where the first leg (31) to the third leg (33) contact the installation surface (G1) in top view. The support part (35) holds the second housing (20) so that the center of gravity of the second housing (20) is located within the imaginary triangle (T1) in top view.

[0087] According to this embodiment, problems such as the tripod (3) tipping over are less likely to occur.

[0088] In the projection system (100) of the third embodiment, in the second embodiment, the support portion (35) supports the second housing (20) so that the entire second housing (20) is located within the imaginary triangle (T1) when viewed from above.

[0089] According to this embodiment, problems such as the tripod (3) tipping over are even less likely to occur.

[0090] In the projection system (100) of the fourth aspect, in any one of the first to third aspects, the support part (35) has a stay (36) that is held by the tripod main body (30). The second housing (20) is detachably attached to the stay (36). The stay (36) is foldable together with the tripod main body (30).

[0091] This aspect makes it easier to set up and take down the projection system (100).

[0092] The projection system (100) of the fifth aspect is the fourth aspect, further comprising a guide portion (6). The guide portion (6) is provided on the lower surface (201) of the second housing (20) and guides the attachment of the second housing (20) to the stay (36).

[0093] According to this embodiment, when the second housing (20) is attached to the support portion (35), the second housing (20) can be easily positioned.

[0094] In a projection system (100) of the sixth aspect, in the fifth aspect, the stay (36) has a long arm (360) whose first end is fixed to the tripod main body (30). The guide portion (6) includes a guide member (60). The guide member (60) is provided on the underside (201) of the second housing (20) and is placed on the arm (360) of the stay (36). The guide member (60) has a groove on its underside that is wider than the arm (360) of the stay (36).

[0095] According to this embodiment, when the second housing (20) is attached to the support portion (35), the positioning of the second housing (20) becomes easier.

[0096] The projection system (100) of the seventh aspect is any one of the fourth to sixth aspects, and further includes a fixing portion (5) that fixes the second housing (20) to the stay (36).

[0097] According to this embodiment, the second housing (20) is less likely to fall off the support part (35), making it easier to carry the projection system (100).

[0098] In the projection system (100) of the eighth aspect, in the seventh aspect, the stay (36) has three arms (360) and a support base (364). The three arms (360) are elongated and each have a first end and a second end, and the first ends are respectively connected to the first leg (31) to the third leg (33) of the tripod body (30). The second ends of the three arms (360) are connected to the support base (364). The second housing (20) is placed on the support base (364). The fixing portion (5) includes a fixing screw (51) that fixes the second housing (20) to the support base (364).

[0099] According to this embodiment, the second housing (20) is even less likely to fall off the support part (35).

[0100] In a projection system (100) of a ninth aspect, in the seventh or eighth aspect, the stay (36) has a long, groove-shaped arm (360) with an open top. A protrusion (202) is provided on the underside (201) of the second housing (20) to be fitted into the groove of the arm (360) of the stay (36). The fixing part (5) includes a fixing pin (52) that is inserted so as to pass through the arm (360) and protrusion (202) of the stay (36).

[0101] According to this embodiment, the second housing (20) is even less likely to fall off the support part (35).

[0102] In the tenth aspect of the projection system (100), in any one of the first to ninth aspects, the support part (35) holds the second housing (20) at a height such that the lower surface (201) of the second housing (20) is located at a height of 50 to 120 cm above the installation surface (G1) when the tripod main body (30) is placed on the installation surface (G1).

[0103] According to this aspect, the workload on the user can be reduced.

[0104] The projection system (100) of an eleventh aspect is any one of the first to tenth aspects, and further comprises a fall prevention cable (7) that prevents the second housing (20) from falling from the support part (35).

[0105] According to this embodiment, it is possible to prevent the second housing (20) from falling off the support portion (35).

[0106] A projection system (100) of a twelfth aspect is any one of the first to eleventh aspects, and further includes a distance measuring unit (12), a rotation unit (13), an angle measuring unit (14), and a correction unit (213). The distance measuring unit (12) is held or housed in the first housing (10). The distance measuring unit (12) measures the distance to the projection surface (101). The rotation unit (13) rotates the first housing (10) relative to the base (34). The angle measuring unit (14) measures the rotation angle of the rotation unit (13). The correction unit (213) corrects the image projected from the projection unit (11) using the distance measured by the distance measuring unit (12) and the rotation angle measured by the angle measuring unit (14).

[0107] According to this aspect, it is possible to correct distortion of the image projected onto the projection surface (101), and it is possible to project an appropriate image. [Explanation of symbols]

[0108] 100 Projection System 10 First cabinet 11 Projection section 12 Ranging section 13 Rotating part 14 Angle measurement section 20 Second cabinet 201 Bottom surface 202 protrusion 211 Projection control unit 213 Correction Unit 3. Tripod 30 Triple font 31 1st leg 32 Second leg 33 Third leg 34 Pedestal 35 Support part 36 Stay 360 Arm 364 Support stand 5 Fixed part 51 Fixing screw 52 Fixing pin 6 Guide section 60 Guide member 7 Fall prevention cable 101 Projection surface G1 installation surface S1 space T1 Virtual Triangle

Claims

1. 1. A projection system for use on a construction site, comprising: a tripod having a tripod body including a first leg, a second leg, a third leg, and a base; a first housing supported by the base of the tripod body; a projection unit that is held or housed in the first housing and projects an image onto a projection surface at the construction site; A second housing; a projection control unit that is held or housed in the second housing and controls the operation of the projection unit, The tripod further includes a support portion held by the tripod body, The support portion supports the second housing so that at least a portion of the second housing is positioned within a triangular pyramid-shaped space formed by the tripod bodies. Projection system.

2. the tripod body supports the first housing so that the center of gravity of the first housing is located within an imaginary triangle connecting three points where the first to third legs contact the installation surface, respectively, in a top view; the support portion supports the second housing so that the center of gravity of the second housing is located within the imaginary triangle in a top view.

10. The projection system of claim 1.

3. the support portion supports the second housing so that the entire second housing is positioned within the imaginary triangle in a top view.

3. The projection system of claim 2.

4. The support portion has a stay that is held by the tripod body, the second housing is detachably attached to the stay, The stays are foldable together with the tripod body.

10. The projection system of claim 1.

5. a guide portion provided on a lower surface of the second housing to guide attachment of the second housing to the stay; 5. The projection system of claim 4.

6. The stay has a long arm portion whose first end is fixed to the tripod body, the guide portion is provided on a lower surface of the second housing and includes a guide member placed on the arm portion of the stay, The guide member has a groove on its underside, the groove having a width greater than the width of the arm portion of the stay.

6. The projection system of claim 5.

7. Further provided is a fixing portion that fixes the second housing to the stay.

5. The projection system of claim 4.

8. The stay is three elongated arms each having a first end and a second end, the first ends of which are connected to the first to third legs of the tripod body, respectively; a support base to which the second ends of the three arms are connected and on which the second housing is placed, the fixing portion includes a fixing screw that fixes the second housing to the support base, 8. The projection system of claim 7.

9. The stay has a long groove-shaped arm portion with an open upper surface, a protrusion that is fitted into the groove of the arm portion of the stay is provided on the underside of the second housing, The fixing portion includes a fixing pin that is inserted so as to penetrate the arm portion and the protrusion portion of the stay.

8. The projection system of claim 7.

10. The support portion supports the second housing at a height such that the lower surface of the second housing is located at a height of 50 to 120 cm from the installation surface when the tripod main body is installed on the installation surface.

10. The projection system of claim 1.

11. a drop prevention cable that prevents the second housing from dropping from the support part; 10. The projection system of claim 1.

12. a distance measuring unit that is held or housed in the first housing and that measures the distance to the projection surface; a rotation unit that rotates the first housing relative to the base; an angle measuring unit that measures a rotation angle of the rotating unit; a correction unit that corrects the image projected from the projection unit using the distance measured by the distance measurement unit and the rotation angle measured by the angle measurement unit, 10. The projection system of claim 1.

Images