Projection device, projection system, and projection method

Abstract

The projection device (20) includes a projection unit (23) that projects drawing data of a building to a projection surface (50) of the building under construction, a distance measuring unit (22) that measures distances from three or more points on the projection surface (50) to the projection device (20), and a control unit (24) that causes the projection unit (23) to project the drawing data to a projection position on the projection surface (50), the projection position being determined based on the measured distances and angles of the distance measuring unit (22) at the time of measuring the distances. The control unit (24) causes the distance measuring unit (22) to form a light emission point based on light emitted by the distance measuring unit (22) on the projection surface (50) to thereby indicate a position of a point that the user wants to select to the user, and irradiates the projection surface (50) with guide light that guides the position of the light emission point.

Description

Technical Field

[0001] This invention relates to projection devices, projection systems, and projection methods. Background Technology

[0002] Various technologies related to laser rangefinders have been proposed in the past. Patent document 1 discloses a shape and size measuring device that can easily, quickly and accurately measure the shape and size of window frames and other structures used for installing doors and windows.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2017-194438 Summary of the Invention

[0004] The problem that the invention aims to solve This invention provides a projection device, projection system, and projection method that can assist a user in determining the position of the projection surface on which the user wants to measure distance.

[0005] Methods for solving problems One aspect of the projection device of the present invention comprises: a projection unit that projects building drawing data onto a projection surface of the building under construction; a distance measuring unit that measures the distances from three or more points selected by a user on the projection surface to the projection device, the three or more points not arranged in a straight line; an angle measuring unit that measures the angle of the distance measuring unit when the distance is measured; and a control unit that causes the projection unit to project the drawing data onto a projection position on the projection surface, the projection position being determined based on the measured distances and the angle of the distance measuring unit when the distance is measured, wherein when the user selects the three or more points, the control unit prompts the user for the position of the point to be selected by forming light-emitting points on the projection surface based on light emitted by the distance measuring unit, and illuminates the projection surface with guide light guiding the position of the light-emitting points.

[0006] One aspect of the projection system of the present invention includes: the projection device; and an operating device for the user to remotely operate the projection device.

[0007] One aspect of the present invention provides a projection method, executed by a projection device, for projecting building drawing data onto a projection surface of the building under construction. The method includes: a distance measurement step, using a distance measuring unit of the projection device to measure the distance from each of three or more points selected by a user on the projection surface to the projection device, wherein the three or more points are not arranged in a straight line; an angle measurement step, measuring the angle of the distance measuring unit when the distance is measured; and a projection step, projecting the drawing data onto a projection position on the projection surface, the projection position being determined based on the measured distance and the angle of the distance measuring unit when the distance is measured. In the distance measurement step, when the user selects each of the three or more points, a light-emitting point is formed on the projection surface to indicate the location of the point the user wants to select, and guide light guiding the position of the light-emitting point is irradiated onto the projection surface.

[0008] Invention Effects The projection device, projection system, and projection method of the present invention can help users determine the position of the projection surface on which they want to measure distance. Attached Figure Description

[0009] Figure 1 This is a diagram showing an outline of the operation of the projection system according to the implementation method.

[0010] Figure 2 This is a block diagram illustrating the functional structure of the projection system in the implementation method.

[0011] Figure 3 This is an external view of the apparatus constituting the projection system of the embodiment.

[0012] Figure 4 This is a flowchart illustrating an example of the operation of the projection system in the implementation method.

[0013] Figure 5 It is a graph representing the coordinate axes of orthogonal coordinates in space.

[0014] Figure 6 It is a diagram representing the calculation formula for the orthographic projection vector.

[0015] Figure 7 This is a diagram showing an example of guiding light illuminating a light source together with a light source point.

[0016] Figure 8 This is a diagram illustrating a structure used for illuminating guide light, as shown in Example 1.

[0017] Figure 9 This is a diagram illustrating a structure used for illuminating guide light, as shown in Example 2.

[0018] Figure 10 This is a diagram illustrating a structure used for illuminating guiding light, as shown in Example 3. Detailed Implementation

[0019] Hereinafter, embodiments will be described in detail with reference to the accompanying drawings. Furthermore, the embodiments described below are general or specific examples. The numerical values, shapes, materials, constituent elements, arrangement positions of constituent elements, connection methods, steps, and order of steps shown in the following embodiments are examples and are not intended to limit the present invention. Additionally, constituent elements not described in the independent claims in the following embodiments will be described as optional constituent elements.

[0020] Furthermore, the figures are schematic diagrams and not necessarily strictly representational. Additionally, substantially identical structures are labeled with the same reference numerals across the figures, and sometimes repeated descriptions are omitted or simplified.

[0021] (Implementation Method) [summary] First, an overview of the projection system of the implementation method will be given. Figure 1 This is a diagram showing an outline of the operation of the projection system according to the implementation method.

[0022] The projection system 10 of this embodiment includes a projection device 20. The projection device 20 is installed within a space 100 inside a building under construction. The projection device 20 projects drawing data, which is at least part of the architectural design data, onto the structures constituting the space 100 at actual size (specifically, the floor, walls, or ceiling, etc.). Projecting at actual size means projecting onto the structures at the size specified in the architectural design data. The drawing data may be, for example, data indicating the position of ink lines in the space, and users such as construction workers should project light of a length consistent with the design at the positions indicated by the ink lines.

[0023] Therefore, users can easily draw ink lines simply by tracing the projected light rays. Furthermore, the light rays do not necessarily have to be used as guides for drawing ink lines; the light rays themselves can also be used as ink lines.

[0024] Furthermore, the projection system 10 only needs to be able to project part or all of the architectural design data, and the drawing data can be data other than the data indicating the position of the ink lines. For example, if the drawing data includes data indicating the installation position of equipment such as a kitchen or bathtub, the projection system 10 can also project the installation position of the equipment at its actual size.

[0025] [structure] Next, the structure of the projection device according to the embodiment will be described. Figure 2 This is a block diagram representing the functional structure of the projection system 10. Figure 3 This is an external view of the apparatus constituting the projection system 10. (Example) Figure 2and Figure 3 As shown, the projection system 10 includes a projection device 20 and an operation device 40. First, the projection device 20 will be described.

[0026] The projection device 20 is a device that displays drawing data, which is at least part of architectural design data, in actual size onto a structure. Specifically, the structure is a floor, wall, ceiling, or column, etc. The projection device 20 is mounted on the floor, for example, on a tripod. The projection device 20 can be mounted on a ceiling suspension bolt or on a wall. The projection device 20 includes a communication unit 21, a rangefinder 22, a projection unit 23, a control unit 24, a storage unit 25, a drive unit 26, an angle measuring unit 27, and a mounting unit 28 (in...). Figure 3 (as shown in the diagram) and housing 29 (in Figure 3 (See diagram in Chinese).

[0027] The communication unit 21 is a communication circuit (in other words, a communication module) used for communication between the projection device 20 and the operating device 40. The communication unit 21 communicates wirelessly with the operating device 40, but wired communication is also possible. There are no particular limitations on the communication standard used by the communication unit 21.

[0028] The ranging unit 22 detects the distance from the projection device 20 to the structures constituting the space 100. The ranging unit 22 is, for example, a TOF (Time of Flight) sensor or other ranging sensor. The ranging unit 22 may also be a ranging sensor using a phase difference detection method, or a ranging sensor using a triangulation method, or other ranging sensors. The ranging unit 22 includes a ranging light source 22a and a detection unit 22b.

[0029] The ranging light source 22a is a light source that emits light toward the structure. The ranging light source 22a can be implemented, for example, by a light-emitting element that emits infrared light, but it can also be implemented by a light-emitting element that emits visible light. Furthermore, as described later, the ranging unit 22 has a laser pointer function for indicating the current ranging target point to the user. This function can be implemented, for example, by a light source different from the ranging light source 22a, but it can also be implemented using the ranging light source 22a if it emits visible light.

[0030] Furthermore, the ranging light source 22a does not necessarily need to be separate from the light source 23a of the projection unit 23; the light source 23a of the projection unit 23 can also be used as the ranging light source 22a. That is, the ranging unit 22 can also be a sensor that does not have the ranging light source 22a but only has the detection unit 22b.

[0031] The detection unit 22b is a light-receiving element that detects the reflected light from the distance-measuring light source 22a within the structure. The detection unit 22b is implemented using a photodiode or the like.

[0032] The projection unit 23 is a projection module used to project drawing data onto the projection surface 50. The projection unit 23 includes a light source 23a and a scanning unit 23b. In addition, although not shown, the projection unit 23 also includes optical components such as lenses and reflectors.

[0033] Light source 23a is, for example, a laser light source implemented by a semiconductor light-emitting element. Alternatively, light source 23a may be a structure that includes multiple light-emitting elements with different emission colors (e.g., a red light-emitting element, a green light-emitting element, and a blue light-emitting element) and switches between emission colors.

[0034] The scanning unit 23b scans the light emitted by the light source 23a onto the structure. The scanning unit 23b is implemented, for example, by a MEMS (Micro-Electro-Mechanical Systems) mirror, but it can also be implemented by a galvanometer mirror.

[0035] The control unit 24 is a control device for controlling the distance measuring unit 22, the projection unit 23, and the drive unit 26 to project drawing data onto the projection surface 50. The control unit 24 may be implemented, for example, by a microcomputer or processor. Alternatively, the control unit 24 may include drive circuits for driving the projection unit 23 and drive circuits for driving the drive unit 26. The function of the control unit 24 is achieved, for example, by the processor constituting the control unit 24 executing a control program stored in the storage unit 25.

[0036] The storage unit 25 is a storage device that stores drawing data and control programs executed by the control unit 24 for projecting the drawing data to actual dimensions. The storage unit 25 is implemented using a semiconductor memory or the like.

[0037] The drive unit 26 is a drive mechanism for changing the orientation of the projection device 20 (in other words, the orientation and angle of the ranging unit 22). More specifically, the drive unit 26 changes the orientation of the housing 29 with reference to the mounting unit 28. The drive unit 26 has a first drive unit 26a for changing the orientation of the projection device 20 in the tilt direction and a second drive unit 26b for changing the orientation of the projection device 20 in the pan direction. The first drive unit 26a and the second drive unit 26b are respectively implemented by a rotary drive device such as a motor. In addition, the drive unit 26 may also have a third drive unit for changing the orientation of the projection device 20 in the roll direction. Furthermore, the drive unit 26 may also be a mechanism with a ball joint.

[0038] The angle measuring unit 27 measures the orientation of the projection device 20 (in other words, the orientation and angle of the distance measuring unit 22). Specifically, the angle measuring unit 27 is an angle sensor that measures the driving amount (i.e., tilt angle and pan angle) of the drive unit 26. Furthermore, if the drive unit 26 has a third drive unit for changing the orientation of the projection device 20 in the roll direction, the angle measuring unit 27 can also measure the roll angle as the driving amount of the drive unit 26.

[0039] Mounting part 28 is a mounting structure for mounting the projection device 20 onto a tripod. Alternatively, the projection device 20 can be mounted on ceiling suspension bolts, in which case mounting part 28 is a mounting structure for mounting the projection device 20 onto the ceiling.

[0040] The housing 29 is a housing that houses the communication unit 21, the ranging unit 22, the projection unit 23, the control unit 24, and the storage unit 25. The housing 29 may be made of resin, but it may also be made of metal.

[0041] Next, the operating device 40 will be described. The operating device 40 is a remote control for the user to remotely operate the projection device 20. The operating device 40 is, for example, a dedicated remote control for the projection device 20. Alternatively, a portable terminal such as a smartphone or tablet with a dedicated application installed can be used as the operating device 40. Specifically, the operating device 40 includes an operation receiving unit 41, a communication unit 42, a control unit 43, a storage unit 44, and a display unit 45.

[0042] The operation receiving unit 41 is a user interface device that receives user operations. The operation receiving unit 41 can be implemented, for example, through a hardware button, but it can also be implemented through a touch panel or the like.

[0043] The communication unit 42 is a communication circuit (in other words, a communication module) used for communication between the operating device 40 and the projection device 20. The communication unit 42 communicates wirelessly with the projection device 20, but wired communication is also possible. There are no particular limitations on the communication standard used by the communication unit 42.

[0044] Based on the operation received by the operation receiving unit 41, the control unit 43 causes the communication unit 42 to send an instruction signal to the projection device 20 to activate the projection device 20. The control unit 43 is implemented, for example, by a microcomputer or processor. The function of the control unit 43 is achieved, for example, by the processor constituting the control unit 43 executing a control program stored in the storage unit 44.

[0045] The storage unit 44 is a storage device that stores the control program executed by the control unit 43. The storage unit 44 is implemented using a semiconductor memory or the like. Architectural design data is also stored in the storage unit 44.

[0046] The architectural design data is three-dimensional data (more specifically, three-dimensional CAD (Computer Aided Design) data) representing the size and shape of space 100. The architectural design data also includes drawing data (two-dimensional data) representing the layout of space 100 and drawing data representing the positions of ink lines, etc. In addition, at least the drawing data in the architectural design data is also stored in the storage unit 25 of the projection device 20.

[0047] The display unit 45 displays images indicating the operating status of the projection device 20. The display unit 45 is implemented using a display panel such as a liquid crystal panel or an organic EL (Electro-Luminescence) panel.

[0048] [Action Example] For accurate projection of drawing data, it is important to correlate the positions within the drawing data with the positions within the projection plane 50. An example of the operation of the projection system 10, including the processing for such positional correlation, will be described. Figure 4 This is a flowchart of an example of the operation of the projection system 10.

[0049] Furthermore, in the following description of the action examples, in space 100, such as Figure 5 Set the coordinate axes of the orthogonal coordinate system as shown. Figure 5 It is a graph representing the coordinate axes of orthogonal coordinates in space 100. Figure 5 The coordinate axis shown defines the position of the projection device 20 (more specifically, the predetermined positions of the distance measuring part 22 and the periphery of the projection part 23 within the projection device 20) as the origin O.

[0050] Furthermore, in the following example, the projection plane 50 is the ground, on which two reference lines L1 and L2 are drawn. These two reference lines L1 and L2 are drawn by the user, for example. The two reference lines L1 and L2 are, for example, orthogonal, and the intersection point of the two reference lines L1 and L2 is reference point D. Reference point D is the point specified in the drawing data that should be projected. In addition, the reference lines L1 and L2 have defined positions within the drawing data, which can be used to correlate their positions within the drawing data with their positions within the projection plane 50. The orthogonality of the two reference lines L1 and L2 is not mandatory; they only need to intersect (not be parallel).

[0051] First, the user places the projection device 20 in space 100 and measures the distance from each of the three distance measuring object points (hereinafter also referred to as measurement points) on the projection surface 50 to the projection device 20 (S11). Alternatively, the user can measure the distance from at least three distance measuring object points to the projection device 20. The user may also measure the distance from more than three distance measuring object points to the projection device 20.

[0052] For example, the distance measuring unit 22 of the projection device 20 indicates the measuring point on the projection surface 50 to the user via a laser pointer. The user drives the drive unit 26 to align the laser pointer with the reference line L1 (or reference line L2), and in this state, performs a measurement indication operation to measure (save) the indicated distance. Thus, the distance from the measuring point to the projection device 20 and the tilt angle indicated during the measurement indication operation are recorded. The tilt angle θ is stored together in storage unit 25. Additionally, the pan / tilt angle... The tilt angle θ is measured by the angle measuring unit 27. If the user performs this operation three times, the distance r from each of the three different measuring points on the projection surface 50 to the projection device 20, and the tilt angle at that time, will be calculated. The tilt angle θ is stored in storage unit 25.

[0053] Next, the control unit 24 calculates the orthogonal coordinates (xyz coordinates) of the three measurement points based on the stored information (i.e., the distance measurement results) (S12). This includes the distance r from each of the three measurement points stored in the storage unit 25 to the projection device 20, and the current pan / tilt angle. The tilt angle θ represents the polar coordinates of the three measuring points, and the control unit 24 can transform the polar coordinates into orthogonal coordinates (xyz coordinates) based on the following formula 1.

[0054] [Mathematical Expression 1] Next, the control unit 24 calculates the orthogonal coordinates of the reference point D based on the orthogonal coordinates of the three measurement points (S13). For example... Figure 5 As shown, when the three measurement points are set as measurement point A, measurement point B, and measurement point C, the control unit 24 can, based on Figure 6 The coordinates of reference point D are calculated using the formula for calculating the orthographic projection vector shown. Figure 6 This is a diagram representing the calculation formula for the orthographic projection vector. Furthermore, if one of the measurement points A, B, and C is the same as the reference point D, step S13 is omitted.

[0055] Next, the control unit 24 calculates the distance from the projection device 20 to the projection surface 50 (i.e., the plane passing through measurement points A, B, and C), and the tilt of the projection surface 50 relative to the projection device 20 (S14). If the equation of the projection surface 50 is set as ax + by + cz = d, and the coordinates of measurement point A are set as (x... a y a , z a The coordinates of the measuring point B are set as (x...). b y b , z b The coordinates of the measuring point C are set as (x...). cy c , z c Then, Equation 2 (determinant) below holds. The control unit 24 calculates the normal vector n = (a, b, c) of the projection surface 50 by transforming Equation 2 as in Equation 3. The normal vector n represents the tilt of the projection surface 50 in orthogonal coordinates, and the length of the normal vector n represents the distance from the projection device 20 to the projection surface 50. That is, calculating the normal vector is equivalent to calculating the distance from the projection device 20 to the projection surface 50 and the tilt of the projection surface 50 relative to the projection device 20.

[0056] [Mathematical Expression 2] Next, the control unit 24, based on the calculated distance from the projection device 20 to the projection surface 50 and the calculated tilt angle of the projection surface 50, causes the projection unit 23 to project the drawing data onto the projection surface 50 (S15). Specifically, the control unit 24 corrects the distortion of the drawing data based on the calculated tilt angle of the projection surface 50 and corrects the projection magnification of the drawing data based on the calculated distance to the projection surface 50.

[0057] Furthermore, the drawing data contains the position information of the baselines. The control unit 24 causes the projection unit 23 to project the corrected drawing data onto the projection surface 50 in a manner that aligns the baselines L1 and L2 in the corrected drawing data with the baselines L1 and L2 on the projection surface, and aligns the coordinates of the specified points in the corrected drawing data with the coordinates of the calculated reference point D (i.e., determining the projection position). Thus, the drawing data is projected onto the projection surface 50 at its actual size.

[0058] As explained above, the projection system 10 uses points on the reference lines L1 and L2 of the projection plane 50, whose positions are specified in the drawing data, as measurement points (points whose coordinates are to be determined). Therefore, the projection system 10 can easily correlate the positions in the drawing data with the positions in the projection plane 50.

[0059] [Example 1 of a structure used for guiding light illumination] As described above, the user selects three measurement points using the laser pointer function of the ranging unit 22. Here, the light-emitting point formed on the projection surface 50 by the laser pointer function of the ranging unit 22 is only a few millimeters in size, so it is sometimes difficult to know where the light-emitting point (i.e., the point that the user wants to select) is located on the projection surface 50.

[0060] Therefore, the projection device 20 illuminates (projects) the guiding light that guides the position of the light-emitting point onto the projection surface 50 together with the light-emitting point. Figure 7 This is a diagram showing an example of guiding light illuminating a light source together with a light source point.

[0061] exist Figure 7In the example, the projection unit 23 is used to illuminate the guide light. Hereinafter, refer to... Figure 8 Example 1 of the structure used for irradiating guide light will be described. Figure 8 This is a diagram illustrating a structure used for illuminating guide light, as shown in Example 1.

[0062] like Figure 8 As shown, the projection device 20 includes a laser light source 61, a lens 62 for collimating the laser emitted by the laser light source 61, and a deflecting mirror 63 for deflecting the collimated laser. The laser light source 61 corresponds to the light source 23a of the projection unit 23, and the deflecting mirror 63 corresponds to the scanning unit 23b of the projection unit 23. That is, the laser light source 61 and the deflecting mirror 63 are included in the projection unit 23.

[0063] The control unit 24 can project a pattern of line-shaped guide light onto the projection surface 50 by moving the deflector 63 while the laser source 61 is emitting light (i.e., by scanning the laser with the deflector 63). Here, the line shape refers to a curve or a straight line. More specifically, the pattern of the guide light can be circular, straight, or rectangular, but it can also be other polygonal shapes, etc., without particular limitation.

[0064] Here, the control unit 24 can also project a pattern of guide light with a linear shape (circular or rectangular frame, etc.) surrounding the light-emitting point onto the projection surface 50. Furthermore, the positional relationship between the light-emitting point and the guide light pattern on the projection surface 50 varies depending on the distance from the projection device 20 to the light-emitting point (projection surface), making it difficult to ensure that the guide light pattern always surrounds the light-emitting point regardless of the distance from the projection device 20 to the light-emitting point. Therefore, for example, it can be designed so that when the distance from the projection device 20 to the light-emitting point is within a specified distance range that is frequently used (e.g., 1m to 3m, etc.), the guide light pattern surrounds the light-emitting point.

[0065] Furthermore, the control unit 24 can also project a pattern of guide light with a shape that illuminates a larger area than the light-emitting point (unlike the line shape described above, the part surrounded by the line shape is also illuminated by the light shape) onto the projection surface 50. Specifically, the shape of the light spot can be any shape such as a circle, ellipse, or polygon. In addition, the control unit 24 can also set the shape of the point light to any graphic such as an arrow.

[0066] The projection device 20, by irradiating a guide light (a pattern of the guide light) onto the projection surface 50 based on structure example 1, can help the user determine the position of the light source (the distance measuring object point). Structure example 1, by using a deflection mirror 63 (a movable part), has the advantage of a high degree of freedom in the pattern of the guide light.

[0067] [Example 2 of a structure for illuminating guiding light] In structural example 1, an example of using the projection unit 23 to illuminate the guide light was described, but the projection device 20 may also have a dedicated optical system (laser light source 61, lens 62, and deflector 63) for illuminating the guide light. That is, the projection device 20 may also have the laser light source 61, lens 62, and deflector 63 separately from the projection unit 23.

[0068] Furthermore, if the projection device 20 is equipped with a dedicated optical system for illuminating guide light, the illumination of guide light can also be achieved through a structure different from that of the projection unit 23. Hereinafter, refer to... Figure 9 Example 2 of the structure used for irradiating the guide light will be described. Figure 9 This is a diagram illustrating a structure used for illuminating guide light, as shown in Example 2.

[0069] like Figure 9 As shown, the projection device 20 includes a laser light source 71 and a lens 72. The lens 72 forms a guiding light pattern on the projection surface 50 by making the laser emitted by the laser light source 71 parallel or divergent light. In addition, the laser light source 71 and the lens 72 are housed in the housing 29, and their orientation is changed by the drive unit 26, similar to the ranging unit 22.

[0070] The control unit 24 can form a pattern of guiding light on the projection surface 50 by emitting light from the laser source 71. Specifically, the control unit 24 projects a pattern of guiding light onto the projection surface 50, which has a light spot shape that illuminates a larger area than the light emission point (unlike the line shape described above, the portion surrounded by the line shape is also illuminated by the light shape). The light spot shape here is specifically a circle or an ellipse, etc. In addition, the projection device 20 can also make the light spot shape into any shape, such as a polygon, by using an aperture or the like that which blocks part of the light emitted from the lens 72 toward the projection surface 50.

[0071] The projection device 20 illuminates the projection surface 50 with a guide light (a pattern of guide light) based on structure example 2, which helps the user to determine the position of the light source (the distance measuring object point). Since structure example 2 does not require a deflection mirror (movable part), it has the advantage of being able to be implemented at a lower cost than structure example 1.

[0072] [Example 3 of a structure used for guiding light illumination] The following is for reference Figure 10 Example 3 of the structure used for irradiating the guide light will be described. Figure 10 This is a diagram illustrating a structure used for illuminating guiding light, as shown in Example 3.

[0073] like Figure 10As shown, the projection device 20 includes a laser source 81, a lens 82 for collimating the laser emitted by the laser source 81, and a diffractive optical element 83 for diffracting the collimated laser. Specifically, the diffractive optical element 83 is a diffraction grating or the like. Furthermore, the laser source 81 and the diffractive optical element 83 are housed in a housing 29, and their orientation is changed via a drive unit 26, similar to the ranging unit 22.

[0074] The control unit 24 can form a guiding light pattern on the projection surface 50 by emitting light from the laser source 81. In structural example 3, the guiding light pattern is a shape corresponding to the specifications of the diffractive optical element 83. That is, by changing the specifications of the diffractive optical element 83, the guiding light pattern can be made into various shapes. Similar to structural example 1, structural example 3 can realize guiding light patterns such as line shapes, line shapes surrounding the light-emitting point, and light spot shapes. In addition, structural example 3 can also set the light spot shape to an arbitrary shape such as an arrow.

[0075] The projection device 20 illuminates the projection surface 50 with a guide light (a pattern of guide light) based on structure example 3, which helps the user to determine the position of the light source (the distance measuring object point). Structure example 3 does not require a deflection mirror (movable part), and therefore has the advantage of being able to be implemented at a lower cost than structure example 1.

[0076] [Effects, etc.] Inventions derived from the disclosure of this specification are, for example, the following. Hereinafter, inventions derived from the disclosure of this specification will be described together with the effects obtained by such inventions.

[0077] Invention 1 is a projection device 20 comprising: a projection unit 23 for projecting building drawing data onto a projection surface 50 of a building under construction; a distance measuring unit 22 for measuring the distance from three or more points selected by a user on the projection surface 50 to the projection device 20, wherein the three or more points are not arranged in a straight line; an angle measuring unit 27 for measuring the angle of the distance measuring unit 22 when the distance is measured; and a control unit 24 for causing the projection unit 23 to project the drawing data onto a projection position on the projection surface 50, wherein the projection position is determined based on the measured distance and the angle of the distance measuring unit 22 when the distance is measured; and when the user selects three or more points, the control unit 24 prompts the user for the position of the point to be selected by forming a light-emitting point on the projection surface 50 based on the light emitted by the distance measuring unit 22, and irradiates the projection surface 50 with guide light to guide the position of the light-emitting point.

[0078] Such a projection device 20 can help the user determine the position on the projection surface 50 on which the user wants to measure distance by illuminating a guide light.

[0079] Invention 2 is that, in the projection device 20 of Invention 1, the control unit 24 uses a laser light source 61, 71 or 81 and optical elements to irradiate the projection surface 50 with laser light as a guide light.

[0080] Such a projection device 20 can illuminate the projection surface 50 with a relatively high brightness of guide light, so that the user can easily detect the guide light.

[0081] Invention 3 is that, in the projection device 20 of Invention 2, the optical element is a deflecting mirror 63 that can deflect the laser emitted by the laser source 61, and the control unit 24 forms a pattern of guiding light on the projection surface 50 by changing the angle of the deflecting mirror 63.

[0082] Such a projection device 20 can realize various patterns of guiding light by using a deflecting mirror 63 (movable part).

[0083] In Invention 4, in the projection device 20 of Invention 3, the laser light source 61 and the deflecting mirror 63 are included in the projection unit 23.

[0084] Such a projection device 20 can use the projection section 23 to illuminate the guide light, thus having the advantage of not requiring an additional structure for illuminating the guide light.

[0085] Invention 5 is that, in the projection device 20 of Invention 2, the optical element is a diffractive optical element 83 that forms a pattern of guiding light on the projection surface 50 by diffraction of the laser emitted by the laser source 81.

[0086] Such a projection device 20 can illuminate the guide light at low cost without using the deflector 63. In addition, the projection device 20 can change the pattern of the guide light according to the specifications of the diffractive optical element 83.

[0087] In Invention 6, in the projection device 20 of Invention 2, the optical element is a lens 72 that forms a pattern of guiding light on the projection surface 50 by making the laser emitted by the laser source 71 parallel or divergent light.

[0088] Such a projection device 20 can illuminate guide light at low cost without using a deflector 63.

[0089] In Invention 7, in any one of the projection devices 20 of Inventions 1 to 5, the pattern of the guiding light formed on the projection surface 50 is a line shape.

[0090] Such a projection device 20 can help the user determine the position on the projection surface 50 where the user wants to measure distance by illuminating a pattern of guide light in the shape of a line.

[0091] In Invention 8, in the projection device 20 of Invention 7, the pattern of guiding light formed on the projection surface 50 is a line shape surrounding the light-emitting point.

[0092] Such a projection device 20 can surround the light source with a pattern of guiding light, so that the user can easily find the light source (the position on the projection surface 50 where the user wants to measure distance).

[0093] Invention 9 is that, in any one of the projection devices 20 of Inventions 1 to 6, the pattern of guiding light formed on the projection surface 50 is a light spot shape that illuminates a range larger than the light-emitting point.

[0094] Such a projection device 20 can project guide light over a relatively large area, so users can easily spot the guide light.

[0095] Invention 10 is a projection system 10, comprising a projection device 20 according to any one of inventions 1 to 9, and an operating device 40 for a user to remotely operate the projection device 20.

[0096] Such a projection system 10 can help the user determine the position on the projection surface 50 on which the user wants to measure distance by illuminating a guide light.

[0097] Invention 11 is a projection method executed by a projection device 20 to project building drawing data onto a projection surface of a building under construction. The method includes: a distance measurement step S11, using a distance measuring unit 22 provided with the projection device 20 to measure the distance from each of three or more points on a projection surface 50 selected by the user to the projection device 20, wherein the three or more points are not arranged in a straight line; an angle measurement step, measuring the angle of the distance measuring unit 22 when the distance is measured; and a projection step S15, projecting the drawing data onto a projection position on the projection surface 50, the projection position being determined based on the measured distance and the angle of the distance measuring unit 22 when the distance is measured. In the distance measurement step S11, when the user selects three or more points, a light-emitting point is formed on the projection surface 50 to indicate the position of the point the user wants to select, and a guiding light is irradiated onto the projection surface 50 to guide the position of the light-emitting point.

[0098] This projection method, by illuminating a guide light, can help the user determine the position on the projection surface 50 on which the user wants to measure distance.

[0099] (Other implementation methods) The above describes the implementation methods, but the present invention is not limited to the above-described implementation methods.

[0100] For example, in the above embodiments, a projection device using laser scanning was described, but the present invention can also be implemented as a projection device using other methods. The projection device only needs to be able to project at least a portion of the architectural design data onto the projection surface at its actual size.

[0101] Furthermore, in the above embodiments, the projection system includes a projection device and an operating device. However, the projection system can also be implemented as a single device. Additionally, the projection system can be implemented as a client-server system, in which case a portion of the processing described in the above embodiments as performed by the projection device is performed by the server device.

[0102] Furthermore, the processing order described in the flowchart of the above embodiment is just one example. The order of multiple processes can be changed, and multiple processes can also be executed in parallel.

[0103] Furthermore, the communication method between the devices in the above embodiments is not particularly limited. Wireless communication or wired communication can occur between the devices. Alternatively, wireless and wired communication can be combined between the devices. Additionally, in the above embodiments, when two devices are communicating, a relay device (not shown) may exist between the two devices.

[0104] Furthermore, in the above embodiments, each component can also be implemented by executing a software program suitable for each component. Each component can also be implemented by a program execution unit such as a CPU or processor reading and executing a software program recorded on a recording medium such as a hard disk or semiconductor memory.

[0105] Furthermore, each component can also be implemented using hardware. For example, each component can be a circuit (or integrated circuit). These circuits can be used as a whole to form a single circuit, or they can be separate circuits. Additionally, these circuits can be general-purpose circuits or dedicated circuits.

[0106] Furthermore, the present invention, in its entirety or in specific forms, can also be implemented using a system, apparatus, method, integrated circuit, computer program, or a recording medium such as a computer-readable CD-ROM. Additionally, it can be implemented using any combination of the system, apparatus, method, integrated circuit, computer program, and recording medium.

[0107] For example, the present invention can also be implemented as a program for causing a computer to perform a projection method. Alternatively, the present invention can also be implemented as a computer-readable, non-transitory recording medium containing such a program.

[0108] Furthermore, this invention also includes various modifications that can be conceived by those skilled in the art to the various embodiments, or the implementation of the embodiments by arbitrarily combining the constituent elements and functions of the embodiments without departing from the spirit of the invention.

[0109] Explanation of reference numerals in the attached figures 10 Projection System 20 Projection devices 21, 42 Ministry of Communications 22 Distance measuring unit 22a Distance measuring light source 22b Inspection Department 23 Projection Section 23a Light Source 23b Scanning section 24, 43 Control Department Storage sections 25 and 44 26 Drive Unit 26a First Drive Unit 26b Second Drive Unit 27 Angle Measurement Section 28 Installation Department 29. Shell 40 Operating device 41 Operations and Acceptance Department 45 Display Section 50 projection surfaces 61, 71, 81 laser light sources 62, 72, 82 lenses 63 Deflecting Mirror 83 Diffractive optical elements 100 Space

Claims

1. A projection device, wherein, have: The projection unit projects the building's drawings and data onto the projection surface of the building under construction. The distance measuring unit measures the distance from three or more points selected by the user on the projection surface to the projection device, wherein the three or more points are not arranged in a straight line. An angle measuring unit measures the angle of the distance measuring unit when the distance is measured; as well as The control unit causes the projection unit to project the drawing data onto a projection position on the projection surface. The projection position is determined based on the measured distance and the angle of the ranging unit when that distance is measured. When the user selects three or more points, the control unit prompts the user for the location of the point they want to select by forming a light-emitting point on the projection surface based on the light emitted by the ranging unit, and illuminates the projection surface with guide light to guide the position of the light-emitting point.

2. The projection device according to claim 1, wherein, The control unit uses a laser light source and optical components to irradiate the projection surface with laser light as the guide light.

3. The projection device according to claim 2, wherein, The optical element is a reflector capable of deflecting the laser emitted by the laser source. The control unit forms the pattern of the guiding light on the projection surface by changing the angle of the reflector.

4. The projection device according to claim 3, wherein, The laser source and the reflector are included in the projection unit.

5. The projection device according to claim 2, wherein, The optical element is a diffractive optical element that forms the pattern of the guiding light on the projection surface by diffraction of the laser emitted by the laser source.

6. The projection device according to claim 2, wherein, The optical element is a lens that forms the pattern of the guiding light on the projection surface by making the laser emitted by the laser source parallel or divergent light.

7. The projection device according to claim 1, wherein, The pattern of the guiding light formed on the projection surface is a line shape.

8. The projection device according to claim 7, wherein, The pattern of the guiding light formed on the projection surface is a line shape surrounding the light-emitting point.

9. The projection device according to claim 1, wherein, The pattern of the guiding light formed on the projection surface is a light spot shape that illuminates a range larger than the light-emitting point.

10. A projection system, wherein, have: The projection device according to any one of claims 1 to 9; and An operating device for the user to remotely operate the projection device.

11. A projection method, performed by a projection device, projects building drawing data onto a projection surface of the building under construction, wherein, include: In the distance measurement step, the distance from three or more points selected by the user on the projection surface to the projection device is measured using the distance measuring unit of the projection device, wherein the three or more points are not arranged in a straight line. The angle measurement step involves measuring the angle of the measuring unit when the distance is measured. as well as The projection step involves projecting the drawing data onto a projection position on the projection surface. This projection position is determined based on the measured distance and the angle of the ranging unit when that distance is measured. In the ranging step, when the user selects each of the three or more points, a light-emitting point is formed on the projection surface to indicate the location of the point the user wants to select, and a guiding light is shone onto the projection surface to guide the position of the light-emitting point.

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