Projection device

Abstract

To provide a projection device which projects a drawing to a member in actual size.SOLUTION: A projection device 1 projects a drawing on a top surface 21 of a member 2 in actual size and includes: a projector 103 which is provided facing the top surface 21; a distance meter 105 for measuring a position of the projector 103; a skeleton 102 which holds the projector 103 and the distance meter 105; and moving means 101 for moving the skeleton 102 in a substantially parallel direction relative to the top surface 21. The projector 103 changes the drawing to be projected to the top surface 21 based on change of the position detected by the distance meter 105.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a projection device, and particularly to a projection device that projects a drawing at actual size onto a member.

Background Art

[0002] In recent years, it has become common to use CAD in design, but paper drawings are still widely used in construction, inspection, etc. That is, while comparing the paper drawing output from CAD with the actual site situation, processes such as tracing, completion check, and inspection are carried out.

[0003] Referring to paper drawings and performing operations such as actual measurement and confirmation while performing scale calculations is cumbersome and the number of processes becomes very large. Also, mistakes are likely to occur. Therefore, in recent years, attempts have been made to eliminate the demerits of paper drawings by displaying a model created in 3D CAD or a projection drawing created from the model on a transmissive display or projecting it with a projector.

[0004] For example, Patent Document 1 describes a system in which an assembly drawing of wood is displayed on a glasses-type wearable terminal and can be referred to at a construction site. Non-Patent Document 1 discloses a system in which design data created in 3D CAD is drawn on the floor, wall, ceiling, etc. of a construction site by a laser projector.

[0005] Also, from the viewpoints of improving the efficiency of construction work and shortening the construction period, etc., there are many cases where factory products processed, assembled, and manufactured in a factory are brought into a construction site as building members. Even in such factories, conventionally, processes such as grid drawing have been carried out using paper drawings. In recent years, systems have been proposed that support processes such as grid drawing by projecting drawings, etc. onto factory products with a projector, as in Patent Documents 2 and 3.

Prior Art Documents

Patent Documents

[0006]

Patent Document 1

[0007] [Non-Patent Document 1] Ryuta Irie, "Bringing BIM to Construction! Laser Projector That Projects Full-Size Drawings onto the Site", [online], September 22, 2010, Nikkei xTECH, [searched on July 12, 2018], Internet <URL:http: / / tech.nikkeibp.co.jp / kn / article / it / column / 20100917 / 543378 / > [Summary of the Invention] [Problems to be Solved by the Invention]

[0008] However, the systems described in Patent Documents 2 and 3 are specialized for specific factory products and are not generally applicable to various factory products including standard products and one-off production products. Also, it has been desired to be portable and have simple calibration etc. so that it can be used in various production sites and construction sites.

[0009] The present invention has been made to solve such problems, and an object thereof is to provide a projection device that projects a drawing at actual size onto a member. [Means for Solving the Problems]

[0010] The projection device according to an embodiment of the present invention is a projection device that projects a drawing at actual size on the top surface of a member, and includes a projector provided to face the top surface, a distance meter for measuring the position of the projector, a framework for holding the projector and the distance meter, and a moving means for moving the framework substantially parallel to the top surface. The projector changes the drawing projected on the top surface based on the change in the position detected by the distance meter. In the projection device according to an embodiment of the present invention, the projector includes a drawing data storage unit for storing drawing data, a projection data generation unit for determining a range to be projected from the drawing data, and a position calculation unit for calculating a change amount of the position measured by the distance meter. The projection data generation unit moves the range to be projected from the drawing data according to the change amount of the position. In the projection device according to an embodiment of the present invention, the moving means can move the framework along the longitudinal direction of the member, and the distance meter detects the position in the longitudinal direction. The projection device according to an embodiment of the present invention further includes a plurality of second distance meters provided to face the top surface. The projector determines the shape of the top surface based on the measured values of the second distance meters and corrects the drawing to be projected based on the shape.

Advantages of the Invention

[0011] According to the present invention, a projection device that projects a drawing at actual size on a member can be provided.

Brief Description of the Drawings

[0012]

Figure 1

Figure 2A

Figure 2B

Figure 3

Figure 4

Figure 5

Embodiments for Carrying Out the Invention

[0013] <Embodiment 1> FIG. 1 is an overall perspective view of the projection device 1 according to Embodiment 1 of the present invention. A member 2 having a flat top surface 21 is placed on the floor of the factory. The member 2 is, for example, a steel material for construction. And the projection device 1 is placed on the floor so as to straddle the member 2.

[0014] The projection device 1 includes ball rollers 101, a framework 102 (102a, 102b, 102c, 102d), a projector 103, pedestals 104 (104a, 104b), and a distance meter 105.

[0015] Four ball rollers 101 (two of which are not shown) arranged so as to surround the member 2 are in contact with the floor and support the entire projection device 1.

[0016] The framework 102 constructed on the ball rollers 101 supports and fixes the projector 103 and the distance meter 105 above the member 2. The framework 102a is two steel materials provided substantially parallel to the longitudinal direction of the member 2. Since the ball rollers 101 are attached to the framework 102a, the projection device 1 can freely move on the floor along the longitudinal direction of the member 2. On the framework 102a, a pair of framework 102b and 102c having a ramen structure are sequentially constructed. Between a pair of frameworks 102c, the framework 102d is passed. The framework 102d is two steel materials and is constructed substantially parallel to the top surface of the member 2.

[0017] The projector 103 is attached to the framework 102d. Since the projector 103 is attached so that the projection direction is downward, a projection surface 3 can be provided on the top surface 21 of the member 2.

[0018] A pedestal 104 for attaching the rangefinder 105 is attached to the framework 102d. The pedestal 104 has a plate material 104b for attaching the rangefinder and four legs 104a for supporting the plate material 104b.

[0019] FIGS. 2A and 2B are a plan view and an elevation view of the pedestal 104. As shown in FIG. 2A, as the material of the plate material 104b, punching metal having holes 104c is suitable. As shown in FIG. 2B, bolts as the legs 104a are respectively inserted into the four holes 104c, and the plate material 104b is supported by nuts 104d. By changing the position of the nuts 104d, the height of the plate material 104b can be changed. Thereby, it is possible to finely adjust the height and inclination of the rangefinder 105. Further, the legs 104a are respectively fixed to the framework 102d with nuts 104e.

[0020] The rangefinder 105 is typically a laser rangefinder, measures the distance to a predetermined measurement point, and outputs the measurement result to the projector 103. In the present embodiment, it is assumed that the rangefinder 105 constantly (every fixed time) measures the distance to an obstacle (such as a wall) existing on the extension of the longitudinal direction of the member 2.

[0021] The projector 103 has a function of projecting drawing data corresponding to the position of the projection device 1 onto the top surface 21 of the member 2. FIG. 3 is a block diagram showing the functional configuration of the projector 103. The projector 103 has a drawing data storage unit 1031, a position calculation unit 1032, a projection data generation unit 1033, and a projection unit 1034.

[0022] The drawing data storage unit 1031 stores the drawing data to be projected onto the member 2. The drawing data is an image of a drawing describing the dimensions (positions to be cut) of the member 2, the positions and diameters to be drilled, etc., and is typically created by CAD or the like.

[0023] In the drawing data, a reference point (origin) Od is defined. At the start of projection, first, the projection angle, magnification, etc. of the projection unit 1034 are adjusted so that the drawing data can be projected at actual size onto the projection plane 3 on the top surface 21. Then, the position of the projection device 1 and the range (view) of the drawing data to be projected are adjusted so that a reference point (for example, the end of the member 2, etc.) Or preset in the real space coincides with the reference point Od in the drawing data. This is called calibration. By this, drawing data such as dimensions can be accurately projected onto the surface of the member 2.

[0024] The position calculation unit 1032 receives the distance measurement result from the distance meter 105 at regular intervals or at the timing when a change in distance occurs. Then, it calculates the amount of change (displacement) in the distance from the previous measurement at that point. For example, if the direction indicated by the dashed arrow in FIG. 1 is taken as the positive direction, when the projection device 1 moves in the positive direction, a positive value is output as the displacement, and when it moves in the negative direction, a negative value is output as the displacement.

[0025] The projection data generation unit 1033 determines the range (view) of the drawing to be projected onto the projection plane 3. That is, it determines which part of the drawing data is to be cut out and projected onto the projection plane 3. Then, it outputs the drawing data within the range included in the view to the projection unit 1034.

[0026] At the time of calibration execution, it is desirable that the view can be arbitrarily set, for example, in response to a user's instruction. On the other hand, after calibration execution, the projection data generation unit 1033 automatically redefines the view according to the displacement received from the position calculation unit 1032. Specifically, if the displacement received from the position calculation unit 1032 is +10 mm, the projection data generation unit 1033 shifts the position of the previous view by 10 mm in the positive direction and generates a new view. The projection data generation unit 1033 outputs the drawing data within the range included in the determined view to the projection unit 1034.

[0027] The projection unit 1034 projects the drawing data received from the data generation unit 1033 onto the projection plane 3 at actual size.

[0028] According to this embodiment, the projection device 1 can project actual-size drawing data onto the top surface 21 of the member 2. When the position of the projection device 1 changes, the projection device 1 changes the range of the drawing data to be projected according to the displacement. Therefore, by moving the projection device 1 along the member 2, the user can visually grasp accurate information such as dimensions and punching positions over the entire member 2. Conventionally, the user had to apply a scale to the member 2 while looking at a paper drawing to figure out dimensions and punching positions, and perform an operation (grid drawing) of marking the corresponding positions on the member 2 with a scriber or a pen. However, according to the projection device 1, it is possible to directly grasp accurate information such as dimensions and punching positions without referring to a paper drawing or the like.

[0029] <Embodiment 2> FIG. 4 is an overall perspective view of the projection device 1 according to Embodiment 2 of the present invention. The projection device 1 according to Embodiment 2 is placed on the flat top surface 21 of the member 2.

[0030] The projection device 1 includes wheels 101, a framework 102 (102a, 102b, 102c, 102d), a projector 103, and distance meters 105 (105a, 105b).

[0031] The four wheels 101 are grounded on the top surface 21 to support the entire projection device 1.

[0032] The framework 102 constructed on the wheels 101 supports and fixes the projector 103 and the distance meters 105 above the member 2. The framework 102a is two sets of four steel materials arranged to surround the member 2 and functions as a guide when the projection device 1 moves in the longitudinal direction of the member 2. Between one set of the frameworks 102a, beam-shaped frameworks 102b arranged to straddle the member 2 in the short direction are respectively arranged. Since the wheels 101 are attached to the frameworks 102b, the projection device 1 can freely move on the floor surface along the longitudinal direction of the member 2. Columnar frameworks 102c are respectively arranged on the frameworks 102b. A beam-shaped framework 102d is spanned between one set of the frameworks 102c. The framework 102d is constructed substantially parallel to the top surface of the member 2.

[0033] The projector 103 is attached to the frame 102d. Since the projector 103 is attached such that the projection direction is downward, the projection surface 3 can be provided on the top surface 21 of the member 2.

[0034] The distance meters 105a and 105b are respectively attached to the two frames 102b. The distance meters 105a and 105b are typically laser distance meters, and respectively measure the distances a and b to the reflectors 4a and 4b installed at the longitudinal ends of the member 2, and output the measurement results to the projector 103.

[0035] The projector 103 has a function of projecting drawing data corresponding to the position of the projection device 1 onto the top surface 21 of the member 2. The functional configuration of the projector 103 is substantially the same as that in the first embodiment, but is different in that the position calculation unit 1032 receives the measurement results of the distances from the two distance meters 105a and 105b. The position calculation unit 1032 can calculate the displacement more accurately than in the first embodiment, for example, by using the average value of the measurement results of the two distance meters as the displacement.

[0036] According to this embodiment, the projection device 1 can move on the top surface 21 of the member 2 by the wheels 101. When the member 2 has a height as in the example of FIG. 4, it is difficult to use the floor surface moving type projection device 1 as in the first embodiment. However, for the top surface moving type projection device 1 as in the second embodiment, it can be used without problems even in such a case.

[0037] Also, according to this embodiment, since the projection device 1 is provided with two distance meters 105a and 105b, it is possible to capture the displacement of the projection device 1 more accurately.

[0038] <Embodiment 3> Embodiment 3 relates to a method of projecting drawing data onto a top surface 21 when the top surface 21 is not a uniformly horizontal plane. Here, the case where the top surface 21 is not a uniformly horizontal plane means, for example, a case where the projection surface 3 and the top surface 21 are not necessarily parallel because there are inclinations, steps, etc. on the top surface 21.

[0039] Based on the configuration of Embodiment 1, this embodiment will be described. In addition to the configuration shown in FIG. 1, the projection device 1 includes a plurality of distance meters 106 (106a, 106b,...). The plurality of distance meters 106 are attached to, for example, the framework 102d and measure the distances to the top surface 21 of the member 2 respectively. The measured values of the plurality of distance meters 106 are each transmitted to the projection data generation unit 1033.

[0040] The projection data generation unit 1033 estimates the shape of the top surface 21 based on the differences in the measured values output by the plurality of distance meters 106. For example, as shown in FIG. 5, it can be recognized that part or all of the top surface 21 is inclined, or that there is a step in part of the top surface 21.

[0041] The projection data generation unit 1033 corrects the drawing data (the drawing data within the range included in the view) to be projected based on the recognized shape of the top surface 21. For example, when the projection range on the top surface 21 includes an inclination, the projection data generation unit 1033 performs trapezoidal correction on the drawing data projected onto the inclined portion. Also, when the projection range on the top surface 21 includes a step, the projection data generation unit 1033 performs projection magnification correction according to the difference in the distance from the projector 103 on the drawing data projected onto the step portion. Thereby, accurate drawing data can be projected without causing distortion in the image even in the inclined portion or the step portion.

[0042] According to this embodiment, the projection device 1 can accurately project drawing data onto the member 2 having inclinations, steps, etc.

[0043] <Other Embodiments> The present invention is not limited to the above-described embodiments and can be appropriately modified without departing from the gist thereof. For example, in the above-described embodiments, a method of obtaining a projected image by shifting the view according to the displacement of the projection device 1 was disclosed. Instead of this, for example, a method of obtaining a projected drawing by mutually converting coordinate systems based on the correspondence (mapping) between the model space and the real space, as disclosed in Patent Document 4 (Japanese Patent Application No. 2018-170899), may be adopted. Thereby, for example, even when the top surface 21 of the member 2 has a complicated shape, an accurate drawing can be projected. Also, it is possible to generate a projected drawing from a 3D model created by 3DCAD or the like.

[0044] Further, in the above-described embodiments, ball rollers and wheels were exemplified as means for moving the projection device 1, but the present invention is not limited thereto, and any other moving means such as using rails may be adopted. Also, the distance meter 105 is not limited to a laser distance meter, and any 3D sensor can be adopted. For example, using a small 3D positioning device such as AzureKinect (registered trademark) DK or RealSense, the unevenness and inclination of the projection surface are judged, and a drawing corresponding to the projection surface is dynamically generated. Furthermore, the structure of the framework 102 is merely an example in the above-described embodiments, and any structure may be used as long as the projector 103, the distance meter 105, and the distance meter 106 can be held at predetermined positions. For example, it is also possible to appropriately add braces for vibration damping to the framework 102 shown in FIGS. 1 and 4.

[0045] Each processing unit constituting the present invention may be configured by hardware, or may be realized by causing a CPU to execute a computer program for any processing. Also, the computer program is stored using various types of temporary or non-temporary computer-readable media and can be supplied to the computer. The temporary computer-readable medium includes, for example, an electromagnetic signal supplied to the computer by wire or wirelessly.

Explanation of Signs

[0046] 1 Projection device 2 Members 21 Top surface 101 Ball roller (wheel) 102(102a, 102b, 102c, 102d) Framework 103 Projector 1031 Drawing data storage unit 1032 Position calculation unit 1033 Projection data generation unit 1034 Projection unit 104(104a, 104b, 104c, 104d, 104e) Pedestal 105(105a, 105b) Rangefinder 3 Projection surface 4(4a, 4b) Reflector

Claims

1. A projection device that projects a projected image onto the top surface of a member, comprising a framework, a distance meter, and a projector, wherein the top surface is at least one flat surface on which an image can be projected from the projector installed above the member when the member is placed on the floor surface, the projected image is a part of drawing data that is an image of a drawing showing the position to be cut, the position to be drilled, or the diameter of the member, and is cut out by a view that is a partial area set within the drawing data, the coordinate system of the drawing data is fixed with respect to the member, and the view is set at a predetermined position within the coordinate system corresponding to the position of the framework, the framework supports and fixes the projector and the distance meter above the member, and is movable along the longitudinal direction of the member and substantially parallel to the top surface, the distance meter measures at any time the distance to an object that exists on the extension of the longitudinal direction of the member and whose position is fixed with respect to the member, and outputs the measurement result to the projector, the projector projects the projected image onto the top surface at actual size, when the user moves the framework, calculates the moving direction and the moving amount of the framework based on the change in the measurement result accompanying the movement, and changes the projected image by moving the position of the view within the coordinate system by the moving direction and the moving amount of the framework Projection device.

2. The projector comprises a drawing data storage unit that stores the drawing data, a projection data generation unit that generates an image included in the view, and a position calculation unit that calculates the moving amount of the framework in the longitudinal direction based on the measurement result from the distance meter, wherein the projection data generation unit changes the position of the view within the drawing data according to the moving amount The projection device according to Claim 1.

3. The height and inclination of the distance meter with respect to the top surface are finely adjustable, The projection device according to Claim 1.

4. further comprising a plurality of second distance meters provided on the framework facing the top surface and measuring the distances to the top surface respectively, wherein the projector determines the shape of the top surface based on the measured values of the plurality of second distance meters, and corrects the drawing data to be projected based on the shape The projection device according to Claim 1.

Images