Digital projector, machine tool, and method for displaying projected images

Abstract

To secure a wide visual field and furthermore to perform highly accurate measurement.SOLUTION: A digital projector of one embodiment comprises: a light source irradiating a workpiece with light; a low magnification camera mechanism imaging a projected image of the workpiece generated by irradiation from the light source; a beam splitter provided on the optical path of the projected image; a high magnification camera mechanism imaging a projected image having been divided by the beam splitter in a narrow range than the low magnification camera mechanism and with a higher magnification than the low magnification camera mechanism; and a display displaying a low magnification image captured by the low magnification camera mechanism and a high magnification image captured by the high magnification camera mechanism. The high magnification camera mechanism includes a high magnification image-forming lens that expands the projected image at a prescribed magnification, a camera for high magnification that captures an expanded projected image, and a movement mechanism for the camera for high magnification that changes the imaging position of the camera for high magnification with respect to a projected image.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a digital projector, a machine tool, and a projection image display method.

Background Art

[0002] Conventionally, an image of the tip shape of a grinding wheel imaged by a camera is simultaneously displayed on a display screen showing the machining shape of a workpiece, and the image of the tip shape of the grinding wheel is relatively moved with respect to the machining shape of the workpiece displayed on the display screen, and a teaching is performed by obtaining the positions of a plurality of contacted locations. There is known an optical copying grinding machine (Patent Document 1).

[0003] In the optical copying grinding machine of Patent Document 1, a scaling icon is displayed on the display screen, and by operating this scaling icon, it is possible to enlarge and reduce an image of the machining shape of the workpiece, an image of the tip shape of the grinding wheel, etc. displayed on the display screen.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In recent years, processed products such as mold parts and tools have become increasingly finer and more precise. Along with this, optical copying grinding machines are required to perform grinding processing and workpiece shape measurement in micron units. In the optical copying grinding machine of Patent Document 1, although various images can be enlarged by the scaling icon, it is only an enlargement of a part of an image captured at a low magnification for widening the field of view by image processing. Therefore, even if an image captured using a high-resolution camera (so-called 4K camera, 8K camera, etc., high-pixel camera) at the time of filing this application is used, it is difficult to perform highly precise measurement in micron units.

[0006] Furthermore, in the optical tracing grinding machine described in Patent Document 1, if the camera's magnification is increased to the extent that measurements can be taken in micron units, the field of view (imaging range) becomes extremely narrow, which can lead to problems such as difficulty in determining which part of the workpiece or grinding wheel is being observed in the image displayed on the screen, and the image on the screen changing drastically even with slight movements of the workpiece or grinding wheel to change the observation area, making it easy to lose track of the observation area.

[0007] One aspect of the present invention is a digital projector, a machine tool, and a projected image display method that can perform high-precision measurements while ensuring a wide field of view. [Means for solving the problem]

[0008] A digital projector according to one aspect of the present invention comprises a light source that irradiates light onto a workpiece; a low-magnification camera mechanism that captures a projected image of the workpiece generated by the irradiation from the light source; a beam splitter provided on the optical path of the projected image; a high-magnification camera mechanism that captures the projected image divided by the beam splitter in a narrower range than the low-magnification camera mechanism and at a higher magnification than the low-magnification camera mechanism; and a display that displays the low-magnification image captured by the low-magnification camera mechanism and the high-magnification image captured by the high-magnification camera mechanism, wherein the high-magnification camera mechanism includes a high-magnification imaging lens that magnifies the projected image to a predetermined magnification; a high-magnification camera that captures the magnified projected image; and a high-magnification camera movement mechanism that changes the imaging position of the high-magnification camera relative to the projected image.

[0009] Furthermore, a machine tool according to one aspect of the present invention is equipped with such a digital projector.

[0010] Furthermore, a projection image display method according to one aspect of the present invention is a projection image display method using the digital projector described above, and includes: a light irradiation step of irradiating a workpiece with light; a low-magnification imaging step of capturing a projection image of the workpiece generated by the light irradiation step using the low-magnification camera mechanism; a high-magnification imaging step of capturing the projection image divided by the beam splitter using the high-magnification camera mechanism in a narrower range than the low-magnification camera mechanism and at a higher magnification than the low-magnification camera mechanism; and a display step of displaying the low-magnification image captured by the low-magnification imaging step and the high-magnification image captured by the high-magnification imaging step on the display.

[0011] According to one aspect of the present invention, a digital projector, a machine tool, and a projection image display method, a wide area of ​​the projected image of a workpiece can be observed using a low-magnification image captured by a low-magnification camera mechanism, while a more pinpoint area of ​​the projected image of the workpiece can be observed at high magnification using a high-magnification image captured by a high-magnification camera mechanism. [Effects of the Invention]

[0012] According to one aspect of the present invention, high-precision measurements can be performed while ensuring a wide field of view. [Brief explanation of the drawing]

[0013] [Figure 1] Figure 1 is a schematic diagram showing the overall configuration of the machine tool according to this embodiment. [Figure 2] Figure 2 is a schematic diagram showing the optical configuration of a digital projector. [Figure 3] Figure 3 is a schematic diagram showing the configuration of the camera movement mechanism for high magnification. [Figure 4] Figure 4 is a schematic diagram showing the system configuration of a digital projector. [Figure 5] Figure 5 schematically shows the range of motion of a high-magnification image relative to a low-magnification image. [Figure 6] Figure 6 is a flowchart showing an example of a projection image display method according to this embodiment. [Figure 7]Figure 7 is a schematic diagram illustrating examples of other display methods for low-magnification and high-magnification images. [Modes for carrying out the invention]

[0014] Hereinafter, preferred embodiments for carrying out the present invention will be described with reference to the drawings. Note that the following embodiments are not intended to limit the invention as defined in each claim, and not all combinations of features described in the embodiments are necessarily essential to the solution of the invention. Furthermore, in these embodiments, the scale and dimensions of each component may be exaggerated, and some components may be omitted.

[0015] [Overall configuration of machine tools] First, the overall configuration of the machine tool according to this embodiment will be explained using Figure 1. Figure 1 is a schematic diagram showing the overall configuration of the machine tool according to this embodiment. In the following explanation, the machine tool according to this embodiment will be described as an optical tracing grinding machine, but it is not limited to this, and any other machine tool equipped with a digital projector may be used. In the following explanation, "X-axis direction" means the direction perpendicular to the plane of the paper in Figure 1, "Z-axis direction" means the up and down direction in Figure 1, and "Y-axis direction" means the left and right direction in Figure 1.

[0016] As shown in Figure 1, the optical tracing grinding machine 1 according to this embodiment includes a workpiece holding mechanism 10 for holding a workpiece W to be processed, a grinding wheel holding mechanism 20 for holding a grinding wheel 22 for grinding the workpiece W on the workpiece holding mechanism 10, a digital projector 30 capable of displaying the workpiece W in an enlarged view, and an operation control panel 70 that can input and register various information related to the grinding process and automatically control the optical tracing grinding machine 1 based on a predetermined processing program. Note that the operation control panel 70 according to this embodiment can employ various known configurations, so a detailed description thereof is omitted.

[0017] As shown in FIG. 1, the work holding mechanism 10 includes a work table 12 on which a work W is placed, and an X-axis direction moving mechanism 14, a Y-axis direction moving mechanism 16, and a Z-axis direction moving mechanism 18 that move the work table 12 in the X-axis direction, Y-axis direction, and Z-axis direction respectively by automatic control based on an operator's operation or a machining program. These X-axis direction moving mechanism 14, Y-axis direction moving mechanism 16, and Z-axis direction moving mechanism 18 are each provided with an operation handle (not shown) operated by an operator, and are configured to move the work W along the X-axis direction, Y-axis direction, and Z-axis direction by the operator's operation via the operation handle. Note that since the work holding mechanism 10 according to the present embodiment can adopt various known configurations, detailed description thereof is omitted.

[0018] As shown in FIG. 1, the grindstone holding mechanism 20 includes a grindstone head 24 that rotatably supports a grindstone 22, and an X-axis direction moving mechanism 25 and a Y-axis direction moving mechanism 26 that move the grindstone head 24 in the X-axis direction and Y-axis direction respectively by automatic control based on an operator's operation or a machining program. The grindstone head 24 supports the grindstone 22 so as to be movable along the Z-axis direction, and is configured to also function as a Z-axis direction moving mechanism of the grindstone 22. The X-axis direction moving mechanism 25 is provided with an X-axis handle 27 operated by an operator, and is configured to move the grindstone 22 along the X-axis direction by the operator's operation via the X-axis handle 27. Further, the Y-axis direction moving mechanism 26 is provided with a Y-axis handle 28 operated by an operator, and is configured to move the grindstone 22 along the Y-axis direction by the operator's operation via the Y-axis handle 28. Note that since the grindstone holding mechanism 20 according to the present embodiment can adopt various known configurations, detailed description thereof is omitted.

[0019] The optical copying grinding machine 1 according to this embodiment is configured to be able to position the workpiece W placed on the worktable 12 in the X-axis direction, Y-axis direction, and Z-axis direction by manual operation or automatic control based on a machining program. Further, the optical copying grinding machine 1 is configured to be able to perform grinding on the workpiece W by bringing the grinding wheel 22 rotated at a predetermined rotational speed into contact with the workpiece W while moving it in the X-axis direction, Y-axis direction, and Z-axis direction by manual operation or automatic control based on a machining program.

[0020] [Overall Configuration of Digital Projector] Next, the specific configuration of the digital projector 30 according to this embodiment will be described with reference to FIGS. 2 to 5. FIG. 2 is a diagram schematically showing the optical configuration of the digital projector. FIG. 3 is a diagram schematically showing the configuration of the high-magnification camera moving mechanism. FIG. 4 is a diagram schematically showing the system configuration of the digital projector. FIG. 5 is a diagram schematically showing the movable range of the high-magnification image with respect to the low-magnification image.

[0021] As shown in FIG. 2, the digital projector 30 includes a main light source 32 (light source) such as an LED that irradiates a subject, which is the workpiece W (workpiece to be machined), with a light beam BM (light), a low-magnification camera mechanism 40 that captures a projected image of the workpiece W generated by the irradiation from the main light source 32, a beam splitter 36 provided on the optical path of the projected image, a high-magnification camera mechanism 5 that captures the projected image of the workpiece W split by the beam splitter 36 in a range narrower than that of the low-magnification camera mechanism 40 and at a higher magnification than that of the low-magnification camera mechanism 40, and a display 31 (see FIG. 1) that displays the low-magnification image LI captured by the low-magnification camera mechanism 40 and the high-magnification image HI captured by the high-magnification camera mechanism 50. Further, as shown in FIG. 4, the digital projector 30 further includes a projector control unit 6 that executes various processes in the digital projector 30. Note that since the main light source 32 according to this embodiment can adopt various known configurations, a detailed description thereof will be omitted.

[0022] Furthermore, as shown in Figure 2, the digital projector 30 is equipped with a relay lens 33 and a reflector 35 between the workpiece W and the beam splitter 36 to transmit the projected image (shadow) of the workpiece W and grinding wheel 22, generated by irradiation from the main light source 32, to the beam splitter 36. In addition, the digital projector 30 may be equipped with various lenses (condenser lens groups) or dustproof glass, etc., between the main light source 32 and the workpiece W and grinding wheel 22, as needed. The relay lens 33 may be a lens group consisting of multiple lenses.

[0023] In this embodiment, the beam splitter 36 is positioned where the projected image of the workpiece W (object to be processed), generated by irradiation from the main light source 32, is formed. The relay lens 33 and the reflector 35 are configured to cooperate with each other to form projected images of the workpiece W and the grinding wheel 22 in the beam splitter 36. Thus, in this embodiment, the projected image is formed within the beam splitter 36, thereby forming an intermediate focal point in the optical path between the workpiece W (object to be processed) and the low-magnification camera mechanism 40 and / or the high-magnification camera mechanism 50. However, the embodiment is not limited to this, and any optical path configuration that ultimately forms an image of the workpiece W (object to be processed) in the low-magnification camera mechanism 40 and the high-magnification camera mechanism 50 is acceptable. From this viewpoint, the position in which the beam splitter 36 is placed is not particularly limited, as long as it is on the workpiece W (object to be processed) side of the low-magnification camera mechanism 40 and the high-magnification camera mechanism 50. For example, instead of using an intermediate focal point at an intermediate position including the beam splitter 36 (as in this embodiment), a configuration in which the optical path is adjusted to the sighting light collimated by the beam splitter 36 may be used.

[0024] In this embodiment, the beam splitter 36 is positioned between the reflecting mirror 35 and the low-magnification camera mechanism 40 and the high-magnification camera mechanism 50, and includes a transmitted light emission surface that splits and transmits the formed projected image (optical path), and a reflected light emission surface that changes the orientation of the formed projected image (optical path) and reflects it to split it. For example, a half mirror or a partial mirror can be used as the beam splitter 36. By including such a beam splitter 36, the digital projector 30 according to this embodiment is configured to allow simultaneous observation of the same area (projected image) at different magnifications using the low-magnification camera mechanism 40 and the high-magnification camera mechanism 50.

[0025] Furthermore, as shown in Figure 2, the digital projector 30 further includes a reflected image light source 37 and a reflected image beam splitter 34. The reflected image light source 37 is a light source such as an LED and is configured to emit a light ray BM'. The reflected image beam splitter 34 is positioned between the workpiece W and grinding wheel 22 and the reflector 35, and is configured to transmit the light ray BM emitted from the main light source 32 toward the reflector 35, and to reflect the light ray BM' emitted from the reflected image light source 37 toward the workpiece W and grinding wheel 22. For example, a half mirror can be used as the reflected image beam splitter 34. These reflected image light source 37 and reflected image beam splitter 34 cooperate with each other to illuminate the workpiece W and grinding wheel 22 from a direction opposite to the irradiation direction of the main light source 32 (downward in this embodiment) (upward in this embodiment), and are configured to also image (or transmit or reflect and split) the reflected image from above the workpiece W in the beam splitter 36. Since various known configurations can be used for the reflected image light source 37 and the reflected image beam splitter 34 according to this embodiment, a detailed explanation thereof will be omitted.

[0026] [Configuration of the low-magnification camera mechanism] The low-magnification camera mechanism 40 is configured to capture either the projected image transmitted through the beam splitter 36 and the projected image reflected and divided by the beam splitter 36. Specifically, as shown in Figure 2, the low-magnification camera mechanism 40 includes a low-magnification camera 42 and a low-magnification imaging lens 44 that transmits the projected image transmitted through the beam splitter 36 to the low-magnification camera 42. In the illustrated example, the low-magnification imaging lens 44 and the low-magnification camera 42 are positioned facing the transmitted light emission surface of the beam splitter 36, but the system is not limited to this, and various arrangements are possible. Furthermore, appropriate components such as reflective means can be added depending on the arrangement.

[0027] The low-magnification imaging lens 44 is configured to magnify or reduce the projected image transmitted through the beam splitter 36 by a predetermined magnification, and then to image this magnified or reduced projected image (low-magnification projection image) with the low-magnification camera 42. The low-magnification imaging lens 44 may be a lens group consisting of multiple lenses (low-magnification imaging lens group). The magnification of the low-magnification imaging lens 44 can be arbitrarily set as long as it is sufficient to capture a relatively wide machining range of the workpiece W. For example, it can be set to approximately 0.3 to 1 times the actual size of the workpiece W and grinding wheel 22. The magnification of the low-magnification imaging lens 44 may also be arbitrarily changed by switching or adding / removing the lenses used.

[0028] The low-magnification camera 42 is configured to capture a low-magnification projected image formed by the low-magnification imaging lens 44. While the low-magnification camera 42 can, for example, use a so-called 4K camera with 4K resolution, it is not limited to this. Various known imaging means, such as a CMOS sensor, CCD sensor, array sensor, and image tube, can be arbitrarily adopted as the low-magnification camera 42. Furthermore, the low-magnification camera 42 is connected to the projector control unit 60 wirelessly or via a wired connection for data transfer. The image data of the low-magnification projected image captured by the low-magnification camera 42 is transferred to the projector control unit 60 and displayed on the display 31 as a low-magnification image LI.

[0029] [Configuration of the high-magnification camera mechanism] The high-magnification camera mechanism 50 is configured to capture the other projection image of either the projection image transmitted and divided by the beam splitter 36 or the projection image reflected and divided by the beam splitter 36. Specifically, as shown in Figure 2, the high-magnification camera mechanism 50 includes a high-magnification imaging lens 54 that magnifies the projection image reflected and divided by the beam splitter 36 at a predetermined magnification, a high-magnification camera 52 that captures the projection image magnified by the high-magnification imaging lens 54 (high-magnification projection image), and a high-magnification camera movement mechanism 57 that changes the imaging position of the high-magnification camera 52 with respect to the projection image reflected and divided by the beam splitter 36 (the reflected light emission surface of the beam splitter 36).

[0030] Furthermore, the high-magnification camera mechanism 50 is further equipped with a reflecting mirror 56 that reflects the high-magnification projected image, magnified by the high-magnification imaging lens 54, toward the high-magnification camera 52. In the illustrated example, the high-magnification imaging lens 54 is positioned opposite the reflected light emission surface of the beam splitter 36, and the high-magnification camera 52 is positioned perpendicular to this opposing direction. However, the mechanism is not limited to this, and various arrangements are possible. In addition, the reflecting mirror 56 can be added or removed depending on the arrangement.

[0031] The high-magnification imaging lens 54 is configured to magnify the projected image reflected and split by the beam splitter 36 at a predetermined magnification, and then to form a high-magnification projected image in the high-magnification camera 52. The high-magnification imaging lens 54 may be a lens group consisting of multiple lenses (high-magnification imaging lens group). The magnification of the high-magnification imaging lens 54 is set to a higher magnification than that of the low-magnification imaging lens 44. Such a magnification can be arbitrarily set within a range that allows the workpiece W to be captured with pinpoint accuracy, for example, it can be set to a magnification that magnifies the actual workpiece W and grinding wheel 22 by about 5 to 10 times. The magnification of the high-magnification imaging lens 54 may be arbitrarily changed by switching or adding / removing the lenses used.

[0032] The high-magnification camera 52 is configured to capture a high-magnification projected image that has been magnified and imaged by the high-magnification imaging lens 54. The high-magnification camera 52 can, for example, use a so-called 2K camera with 2K resolution, but is not limited to this. Various known imaging means such as a CMOS sensor, CCD sensor, array sensor, and image tube can be arbitrarily adopted as the high-magnification camera 52. Furthermore, the high-magnification camera 52 is connected to the projector control unit 60 wirelessly or by wire to enable data transfer, and is configured to transfer image data of the high-magnification projected image captured by the high-magnification camera 52 to the projector control unit 60 and display it on the display 31 as a high-magnification image HI.

[0033] The high-magnification camera movement mechanism 57 is configured to change the imaging position of the high-magnification camera 52 in accordance with the movement (change of display position) of the high-magnification image HI, as described later. Specifically, the high-magnification camera movement mechanism 57 is configured to change the imaging position of the high-magnification camera 52 with respect to the reflected light emission surface of the beam splitter 36 while maintaining the relative positional relationship of the high-magnification imaging lens 54, the high-magnification camera 52, and the reflecting mirror 56. More specifically, as shown in Figure 3, the high-magnification camera movement mechanism 57 includes a movable housing 58 configured to move relative to the fixed housing 11 in which the beam splitter 36 is built, and an X-axis drive unit 59x (see Figure 4) and a Y-axis drive unit 59y (see Figure 4) that move the movable housing 58 along directions perpendicular to the direction in which the reflected light emission surface of the beam splitter 36 and the high-magnification imaging lens 54 face each other (the Z-axis direction in Figure 3) (the X-axis direction and the Y-axis direction in Figure 3).

[0034] In addition to the beam splitter 36, the fixed housing 11 houses a relay lens 33, a reflector 35, a beam splitter 34 for the reflected image, and a light source 37 for the reflected image, all of which are immovable relative to each other. Furthermore, the fixed housing 11 incorporates a low-magnification camera mechanism 40, which is immovable relative to the transmitted light emission surface of the beam splitter 36. However, the low-magnification camera mechanism 40 may be movable relative to the transmitted light emission surface of the beam splitter 36, that is, it may be able to change the imaging range of the projected image that has been transmitted through the transmitted light emission surface of the beam splitter 36 and divided.

[0035] The movable housing 58 houses the high-magnification imaging lens 54, the high-magnification camera 52, and the reflecting mirror 56 in a state where they cannot move relative to each other. The movable housing 58 is configured to be movable relative to the reflected light emission surface of the beam splitter 36 built into the fixed housing 11, thereby allowing the imaging range of the high-magnification camera 52 to be changed relative to the projected image that is reflected and divided by the beam splitter 36.

[0036] The X-axis drive unit 59x is configured to move the movable housing 58 relative to the fixed housing 11 along the X-axis direction (a first direction perpendicular to the direction in which the reflected light emission surface of the beam splitter 36 and the high-magnification imaging lens 54 face each other) based on an X-axis movement command output in response to an operator's operation instruction. The Y-axis drive unit 59y is configured to move the movable housing 58 relative to the fixed housing 11 along the Y-axis direction (a direction perpendicular to the direction in which the reflected light emission surface of the beam splitter 36 and the high-magnification imaging lens 54 face each other and the first direction) based on a Y-axis movement command output in response to an operator's operation instruction. In this embodiment, various known configurations can be adopted for the X-axis drive unit 59x and the Y-axis drive unit 59y, so a detailed explanation thereof is omitted.

[0037] [Display configuration] The display 31 has a display area capable of displaying a low-magnification image LI captured by the low-magnification camera mechanism 40 and a high-magnification image HI captured by the high-magnification camera mechanism 50. The display area of ​​the display 31 is composed of a touch panel that can receive operation instructions from the operator. The display 31 is not limited to a touch panel, and various arbitrary configurations such as a liquid crystal display can be adopted. In addition, although the display 31 is a fixed display mounted on the main body of the digital projector 30 in the illustrated example, it is not limited to this, and may be a remote display installed at a location separate from the main body of the digital projector 30, or it may be a portable display such as a tablet terminal. Furthermore, examples of operator operations include various operations such as touching, swiping, pinching open, and pinching close on the touch panel, but it is not limited to these, and may be an operating means provided separately from the display 31 (e.g., a mouse, keyboard, and jog).

[0038] [Projector Control Unit Configuration] As shown in Figure 4, the projector control unit 60 includes a screen display processing unit 62 that controls the screen display processing of the display 31, a drive processing unit 64 that controls the high-magnification camera movement mechanism 57 in accordance with the operator's instructions, and a storage unit 66 that stores various information and programs for operating the projector control unit 60. Specifically, the projector control unit 60 includes a hardware processor such as a CPU, RAM, and ROM, and is configured to realize the functions of the screen display processing unit 62 and the drive processing unit 64 by loading the program stored in the storage unit 66 into the RAM, and then interpreting and executing it using the CPU.

[0039] The screen display processing unit 62 is configured to simultaneously display the low-magnification image LI captured by the low-magnification camera mechanism 40 and the high-magnification image HI captured by the high-magnification camera mechanism 50 on the display 31. Specifically, the screen display processing unit 62 is configured to perform pre-processing, such as inversion, on the image data acquired from the low-magnification camera mechanism 40 as needed, and then enlarge and display the pre-processed image data as the low-magnification image LI across almost the entire area of ​​the display 31. Furthermore, the screen display processing unit 62 is configured to perform pre-processing, such as inversion, on the image data acquired from the high-magnification camera mechanism 50 as needed, and then enlarge and display the pre-processed image data as the high-magnification image HI across a portion of the display 31.

[0040] Here, the low-magnification image LI is an image displayed at a predetermined magnification of the projected image that has been transmitted through the beam splitter 36 and divided, and the high-magnification image HI is an image displayed at a higher magnification than the low-magnification image LI, showing a portion of the projected image that has been reflected and divided by the beam splitter 36. The shapes (aspect ratios) of the window displaying the low-magnification image LI and the window displaying the high-magnification image HI may be the same or different. Furthermore, the shapes (aspect ratios) of each window displaying the low-magnification image LI and the high-magnification image HI may be the same as or different from the display area of ​​the display 31.

[0041] Furthermore, the screen display processing unit 62 is configured to display a low-magnification image LI and a high-magnification image HI superimposed on the display 31. Specifically, as shown in Figure 5, the screen display processing unit 62 is configured to align the origins of the low-magnification image LI and the high-magnification image HI at predetermined reference points and to display the high-magnification image HI superimposed on the low-magnification image LI. Examples of reference points in this case include the center (0,0) of the low-magnification image LI and the center (0,0) of the high-magnification image HI, but it is not limited to these, and the corners of the low-magnification image LI and the high-magnification image HI may also be used as reference points. In addition, the screen display processing unit 62 is configured to display the high-magnification image HI on the corresponding part of the low-magnification image LI by converting the coordinate position (mechanical coordinate position) of the high-magnification camera movement mechanism 57 to the coordinate position on the display 31 (screen coordinate position) and displaying the high-magnification image HI at this converted screen coordinate position. In other words, as shown in Figure 4, the screen display processing unit 62 is configured to overlay a high-magnification image HI, which shows the shape of a portion of the low-magnification projection image (high-magnification projection image), onto a portion of the low-magnification projection image LI. The screen display processing unit 62 may also be configured to switch the display of the high-magnification image HI on and off by the operator. Furthermore, the screen display processing unit 62 may be configured to change the display size of the high-magnification image HI.

[0042] Furthermore, the screen display processing unit 62 is configured to overlay and display machining support image data (e.g., line drawing data) pre-stored in the storage unit 66 onto the low-magnification image LI and the high-magnification image HI. Specifically, the screen display processing unit 62 is configured to display machining support image data corresponding to the low-magnification projection image of the low-magnification image LI on the low-magnification image LI at the same magnification as the low-magnification projection image, and to display machining support image data corresponding to the high-magnification projection image of the high-magnification image HI on the high-magnification image HI at the same magnification as the high-magnification projection image. Examples of such machining support image data include chart diagrams showing the desired shape (shape to be ground) of the workpiece W (object to be processed), but are not limited to this, and may include various template shapes such as straight lines and arcs.

[0043] Furthermore, the screen display processing unit 62 is configured to perform operations to enlarge or reduce the low-magnification image LI and high-magnification image HI on the display 31, respectively, based on the operator's actions. In addition, the screen display processing unit 62 is configured to enlarge or reduce the processing support image data by the same magnification in conjunction with the enlargement or reduction of the low-magnification image LI and high-magnification image HI. The screen display processing unit 62 may be configured to perform operations to enlarge or reduce the low-magnification image LI and high-magnification image HI independently, or, instead of or in conjunction with this, it may be configured to perform operations to enlarge or reduce the low-magnification image LI and high-magnification image HI in conjunction. Examples of such enlargement or reduction operations include, but are not limited to, operations via touching the enlargement and reduction buttons displayed on the display 31, or operations such as pinch-open and pinch-close on the low-magnification image LI and high-magnification image HI on the display 31.

[0044] Furthermore, the screen display processing unit 62 is configured to change the display position of the high-magnification image HI on the display 31. Specifically, the screen display processing unit 62 is configured to execute a process that moves the high-magnification image HI on the display 31 by the operator's operation. The screen display processing unit 62 is also configured to move the processing support image data by the same distance in conjunction with the movement of the high-magnification image HI. The movement range of the high-magnification image HI can be, but is not limited to, a range in which the center (0,0) of the high-magnification image HI does not exceed the four corners of the low-magnification image LI, as shown in Figure 5. In addition, the movement range of the high-magnification image HI (the movable range of the high-magnification camera movement mechanism 57) may or may not match the shape (aspect ratio) of the display area of ​​the display 31.

[0045] The screen display processing unit 62 may be configured to execute a process that moves the low-magnification image LI within the display 31 by the operator's operation, and in this case, it may also be configured to execute a process that moves the high-magnification image HI and processing support image data on the display 31 in conjunction with the movement of the low-magnification image LI. Furthermore, the screen display processing unit 62 may be configured to switch between a linked movement mode, in which other images or image data are moved in conjunction with the moving target (high-magnification image HI, low-magnification image LI, or processing support image data), and an independent movement mode, in which each element is moved independently of each other. Examples of such movement operations include swipe operations on the display 31, but are not limited to these, and may also be performed by touching the destination, touching a movement operation button displayed on the display 31, or using an operating means provided separately from the display 31 (for example, a mouse, keyboard, and jog).

[0046] Furthermore, the screen display processing unit 62 may be configured to execute a process that moves the low-magnification image LI, the high-magnification image HI, and the processing support image data on the display 31 in conjunction with the movement of the workpiece W by the workpiece holding mechanism 10. Specifically, the screen display processing unit 62 may be configured to obtain the coordinate position of the workpiece W from the workpiece holding mechanism 10, calculate the amount of movement of the workpiece W, convert the amount of movement into an amount of movement on the display 31 based on a predetermined set magnification, and execute a process that moves the low-magnification image LI, the high-magnification image HI, and the processing support image data based on the converted amount of movement.

[0047] Furthermore, in addition to the various processes described above, the screen display processing unit 62 may be configured to perform, for example, processes for displaying and adjusting auxiliary lines (cross lines and extension lines displayed on the curved parts of the chart), processes for displaying concentric circles necessary for aligning the grinding wheel position, processes for measuring the shape of the workpiece W (for example, the distance between any two points, the linear angle, the radius of the arc, the step distance, the pitch, and the difference amount from the CAD data), processes for measuring the tip shape of the grinding wheel transferred to a dummy workpiece, simulation processes for overlaying the grinding wheel movement path in the machining program onto the actual image (low-magnification image LI and high-magnification image HI), and machining program correction processes.

[0048] Furthermore, the screen display processing unit 62 may be configured to perform a process (automatic workpiece shape measurement process) that automatically measures the shape of the workpiece W using measurement positions specified in advance in CAD data. The screen display processing unit 62 may also be configured to display the results of the automatic workpiece shape measurement process on the display 31 simultaneously with a low-magnification image LI, a high-magnification image HI, and a chart. The results of the automatic workpiece shape measurement process may be displayed, for example, by visually showing the dimensional difference between the measured dimensions of the workpiece contour and the desired finished shape. In this case, the allowable tolerance may also be visually displayed simultaneously with the dimensional difference. An example of such a display of allowable tolerance is to simultaneously display an internal allowable tolerance chart showing the allowable shape on the negative side (inside the workpiece W) and an external allowable tolerance chart showing the allowable shape on the positive side (outside the workpiece W), using the outline of the desired shape as a reference. With this configuration, a double frame is formed and displayed by the inner tolerance chart (inner frame line) and the outer tolerance chart (outer frame line), and the area between these double frame lines represents the tolerance range. Therefore, by simply visually checking whether the dimensional difference resulting from the measurement is included between these double frame lines, it becomes possible to easily determine whether the result of the automatic workpiece shape measurement process is within the tolerance range. The screen display processing unit 62 may also be configured to read and display past results stored in the storage unit 66.

[0049] The drive processing unit 64 is configured to control the high-magnification camera movement mechanism 57 in response to the operator's movement operation of the high-magnification image HI. Specifically, when the operator inputs a command to move the high-magnification image HI, the drive processing unit 64 is configured to convert the amount of movement of the high-magnification image HI on the display 31 (amount of movement in screen coordinates) into the amount of movement of the high-magnification camera movement mechanism 57 in the X'Y' axes (amount of movement in mechanical coordinates). The drive processing unit 64 is also configured to drive the X-axis drive unit 59x and the Y-axis drive unit 59y of the high-magnification camera movement mechanism 57 based on this converted amount of movement of the X'Y' axes, and to execute the process of capturing the high-magnification image HI with the high-magnification camera 52. The screen display processing unit 62 is configured to execute the above-mentioned movement process of the high-magnification image HI by redisplaying the captured high-magnification image HI on the display 31. The conversion in this case may be, for example, a conversion method in which a relative amount on the touch panel is multiplied by a conversion coefficient, but is not limited to this. Furthermore, the drive processing unit 64 may capture high-magnification images HI in real time while the high-magnification camera movement mechanism 57 is moving, or it may capture high-magnification images HI after the high-magnification camera movement mechanism 57 has moved.

[0050] By having the above configuration, the digital projector 30 can perform grinding on the workpiece W while simultaneously viewing a low-magnification image LI and a high-magnification image HI, so that their shapes match. Furthermore, in the creation of a machining program using the teaching playback method, the digital projector 30 is configured to simultaneously display the projected image of the grinding wheel 22 and machining support image data such as a chart on the display 31, and to teach (measure and register) the grinding wheel position along the contour of the chart.

[0051] [Projected image display method] Next, a method for displaying a projected image using the digital projector 30 according to this embodiment will be explained with reference to Figure 6. Figure 6 is a flowchart showing an example of a projected image display method according to this embodiment.

[0052] The projection image display method according to this embodiment generally includes a light irradiation step (S1) in which a light ray BM (light) is irradiated onto a workpiece W (workpiece), a low-magnification imaging step (S2) in which the projection image of the workpiece W generated by the light irradiation step is captured by a low-magnification camera mechanism 40, a high-magnification imaging step (S3) in which the projection image divided by the beam splitter 36 is captured by a high-magnification camera mechanism 50 in a narrower range than that of the low-magnification camera mechanism 40 and at a higher magnification than that of the low-magnification camera mechanism 40, and a display step (S4) in which the low-magnification image LI captured by the low-magnification imaging step (S2) and the high-magnification image HI captured by the high-magnification imaging step (S3) are displayed on a display 31.

[0053] Specifically, first, when the power is turned ON by the operator, a light ray BM (light) is emitted from the main light source 32 (S1: light irradiation process). This creates shadows of the workpiece W and grinding wheel 22, and these shadows are transmitted or reflected through the beam splitter 36 via the relay lens 33 and reflector 35, split and formed into images, thereby forming projected images of the workpiece W and grinding wheel 22. In addition, in the projected image display method according to this embodiment, the reflected image light source 37 and the reflected image beam splitter 34 also transmit or reflect the reflected images of the workpiece W and grinding wheel 22 from above through the beam splitter 36, split and formed into images.

[0054] Next, the low-magnification camera mechanism 40 is activated, and the projected image formed after passing through the beam splitter 36 and splitting is captured by the low-magnification camera mechanism 40 (S2: low-magnification imaging process). In parallel with this low-magnification imaging process (S2), the high-magnification camera mechanism 50 is activated, and the projected image formed after being reflected and split by the beam splitter 36 is captured by the high-magnification camera mechanism 50 (S3: high-magnification imaging process).

[0055] Then, the image data captured in the low-magnification imaging process (S2) and the image data captured in the high-magnification imaging process (S3) are transferred to the screen display processing unit 62, where predetermined pre-processing is performed. The image data captured in the low-magnification imaging process (S2) is displayed as a low-magnification image LI across almost the entire area of ​​the display 31, and the image data captured in the high-magnification imaging process (S3) is displayed as a high-magnification image HI in a portion of the display 31 (S4: display process).

[0056] This makes it possible to observe a wide area (e.g., the entire) of the projected image using the low-magnification image LI, while simultaneously magnifying a more specific area of ​​the projected image with the high-magnification image HI to observe the details of the workpiece and measure its shape and dimensions. Furthermore, in the projection image display method according to this embodiment, the processing support image data described above can also be displayed on the display 31 together with the low-magnification image LI and the high-magnification image HI.

[0057] Furthermore, in the projection image display method according to this embodiment, when the display position of the high-magnification image HI is detected to have been changed by the operator's operation while the low-magnification image LI and the high-magnification image HI are simultaneously displayed on the display 31, the amount of operation movement of the high-magnification image HI on the display 31 (amount of movement of coordinates on the screen) is converted into the amount of X'Y' axis movement of the high-magnification camera movement mechanism 57 (amount of movement of mechanical coordinates) (S6), and the high-magnification camera movement mechanism 57 is moved based on this converted amount of X'Y' axis movement (S7), and the projection image reflected and split and formed by the beam splitter 36 is captured again by the high-magnification camera mechanism 50 (S8: high-magnification re-imaging step). Then, the image data recaptured in the high-magnification recapture process (S8) is transferred to the screen display processing unit 62, and after predetermined preprocessing, the image data recaptured in the high-magnification recapture process (S8) is displayed as the high-magnification image HI, replacing the high-magnification image HI captured in the high-magnification imaging process (S3) (S9: redisplay process).

[0058] Subsequently, if the display position of the high-magnification image HI is changed again by the operator, the processes S6 to S9 described above are repeated. On the other hand, if the display position of the high-magnification image HI is not changed by the operator (NO in S5), the simultaneous display of the low-magnification image LI and the high-magnification image HI continues. Furthermore, if the operator performs operations such as hiding the high-magnification image HI, enlarging or reducing the low-magnification image LI and the high-magnification image HI, or displaying image data for processing support, the corresponding screen display processing is performed as appropriate. When the series of grinding processes, workpiece shape measurement, teaching, etc. are completed, the operator turns off the power, and the series of processes for the projection image display method are completed.

[0059] [Advantages of the digital projector according to this embodiment] As described above, the digital projector 30 according to this embodiment includes a main light source 32 (light source) such as an LED that irradiates a light ray BM (light) onto a workpiece W (workpiece), a low-magnification camera mechanism 40 that captures a projected image of the workpiece W generated by the irradiation from the main light source 32, a beam splitter 36 provided on the optical path of the projected image, a high-magnification camera mechanism 50 that captures the projected image of the workpiece W divided by the beam splitter 36 in a narrower range than the low-magnification camera mechanism 40 and at a higher magnification than the low-magnification camera mechanism 40, and a display 31 that displays the low-magnification image LI captured by the low-magnification camera mechanism 40 and the high-magnification image HI captured by the high-magnification camera mechanism 50.

[0060] Furthermore, a digital projector 30 with such a configuration has the advantage that, while observing a wide area (e.g., the entire) of the projected image of the workpiece W and / or grinding wheel 22 at low magnification using the low-magnification image LI captured by the low-magnification camera mechanism 40, it is possible to magnify a more pinpoint area of ​​the projected image of the workpiece W at high magnification using the high-magnification image HI captured by the high-magnification camera mechanism 50, thereby enabling observation of the workpiece's details and measurement of its shape and dimensions.

[0061] In particular, the digital projector 30 according to this embodiment acquires low-magnification image LI and high-magnification image HI separately using two sets of camera mechanisms, a low-magnification camera mechanism 40 and a high-magnification camera mechanism 50. This makes it possible to display the high-magnification image HI with high resolution, enabling highly accurate measurements in micron units. Furthermore, the digital projector 30 according to this embodiment allows users to grasp the overall shape of the workpiece W using the low-magnification image LI while simultaneously magnifying and observing a portion of the workpiece W using the high-magnification image HI, making it easy for even inexperienced users to determine the dimensions of the workpiece shape. Moreover, since the digital projector 30 according to this embodiment displays both the low-magnification image LI and the high-magnification image HI on the display 31, it is possible to realize a grinding machine with high added value, including image measurement and processing support.

[0062] Furthermore, as described above, the digital projector 30 according to this embodiment includes a high-magnification camera mechanism 50 which comprises a high-magnification imaging lens 54 that magnifies the projected image at a predetermined magnification, a high-magnification camera 52 that captures the magnified projected image, and a high-magnification camera movement mechanism 57 that changes the imaging position of the high-magnification camera 52 relative to the projected image. With such a digital projector 30, it is possible to change the position of the high-magnification image HI on the projected image, making it possible to display any position on the projected image as the high-magnification image HI.

[0063] Furthermore, as described above, the digital projector 30 according to this embodiment is configured to allow the display position of the high-magnification image HI on the display 31 to be changed, and the high-magnification camera movement mechanism 57 is configured to change the imaging position of the high-magnification camera 52 in accordance with the change in the display position of the high-magnification image HI. With such a digital projector 30, the imaging position of the high-magnification camera 52 can be changed by the intuitive operation of changing the display position of the high-magnification image HI on the display 31, thereby improving operability.

[0064] Furthermore, as described above, the digital projector 30 according to this embodiment is configured such that an intermediate focal point is formed in the optical path between the workpiece W (workpiece) and the low-magnification camera mechanism 40 and / or high-magnification camera mechanism 50. The low-magnification camera mechanism 40 is configured to capture the divided projection image transmitted or reflected (transmitted in the above example) through the beam splitter 36, and the high-magnification camera mechanism 50 is configured to capture the divided projection image reflected or transmitted (reflected in the above example) through the beam splitter 36. With such a digital projector 30, the working distance above the workpiece W can be increased by the relay lens 33, and the optical configuration upstream of the beam splitter 36 can be shared between the low-magnification camera mechanism 40 and the high-magnification camera mechanism 50. This makes it possible to reduce equipment costs, and the low-magnification camera mechanism 40 and the high-magnification camera mechanism 50 enable more reliable simultaneous observation of the same area (the same projection image before it is divided by the beam splitter 36) at different magnifications.

[0065] Furthermore, as described above, the digital projector 30 according to this embodiment is configured to display a low-magnification image LI and a high-magnification image HI superimposed on the display 31. Compared to the case where the low-magnification image LI and the high-magnification image HI are displayed in separate locations, such a digital projector 30 has the advantage of making it easier to visually understand the position of the high-magnification image HI on the low-magnification image LI. This advantage is particularly noticeable when a high-magnification image HI, which shows the shape of a part of the low-magnification projected image (high-magnification projected image), is superimposed on a part of the low-magnification projected image shown by the low-magnification image LI.

[0066] [Differentiation] Although preferred embodiments of the present invention have been described above, the technical scope of the present invention is not limited to the embodiments described above. Various modifications or improvements can be made to each of the above embodiments.

[0067] For example, in the above-described embodiment, the high-magnification camera mechanism 50 was described as including a high-magnification imaging lens 54, a high-magnification camera 52, and a high-magnification camera movement mechanism 57. However, the invention is not limited to this, and a configuration without the high-magnification camera movement mechanism 57 is also possible.

[0068] In the embodiment described above, the imaging position of the high-magnification camera 52 was described as being changed in accordance with the change in the display position of the high-magnification image HI on the display 31. However, the system is not limited to this configuration, and the imaging position of the high-magnification camera 52 may be changed by operating the high-magnification camera movement mechanism 57 with a jog dial or the like. In this case, the display position of the high-magnification image HI on the display 31 may also be changed in accordance with the change in the imaging position of the high-magnification camera 52.

[0069] In the embodiment described above, the low-magnification camera mechanism 40 captures one of the projection images, either the projection image transmitted and divided by the beam splitter 36 or the projection image reflected and divided by the beam splitter 36, while the high-magnification camera mechanism 50 captures the other projection image. However, the invention is not limited to this configuration, and various configurations can be adopted as long as the high-magnification camera mechanism 50 can capture the projection image in a narrower range and at a higher magnification than the low-magnification camera mechanism 40. For example, the optical configuration for transmitting the projection image of the workpiece W (workpiece) to the low-magnification camera mechanism 40 and the optical configuration for transmitting the projection image of the workpiece W (workpiece) to the high-magnification camera mechanism 50 may be provided independently of each other.

[0070] In the embodiments described above, the low-magnification image LI and the high-magnification image HI were superimposed and displayed on the display 31. However, the invention is not limited to this, and for example, as shown in Figure 7, the low-magnification image LI and the high-magnification image HI may be displayed side by side without superimposing, or the low-magnification image LI and the high-magnification image HI may be displayed on separate displays. In these cases, for example, as shown in Figure 7, a configuration may be provided that allows the display of guide lines G indicating which part of the low-magnification projection image of the low-magnification image LI corresponds to the part shown by the high-magnification image HI.

[0071] In the embodiments described above, the machine tool was assumed to be an optical tracking grinding machine 1, but it is not limited to this, and can be used with various machine tools as long as they are equipped with a digital projector.

[0072] It is clear from the claims that the above-mentioned modifications are included within the scope of the present invention. [Explanation of Symbols]

[0073] 1: Optical tracing grinding machine 10: Workpiece holding mechanism 20: Grinding wheel holding mechanism 22: Sharpening stone 30: Digital projector 31: Display 32: Main light source 33: Relay Lens 34: Beam splitter for reflected images 35:Reflector 36: Beam Splitter 37: Light source for reflected image 40: Low-magnification camera mechanism 42: Low-magnification camera 44: Low-magnification imaging lens 50: High-magnification camera mechanism 52: High-magnification camera 54: High-magnification imaging lens 56:Reflector 57: Camera movement mechanism for high magnification 58: Movable housing 59x: X-axis drive unit 59y: Y-axis drive unit 60: Projector control unit 62: Screen display processing unit 64: Drive Unit 66: Storage section 70: Operation control panel BM,BM´ : Ray of light G: Guide frame HI: High-magnification image LI: Low magnification image W: Work

Claims

1. A light source that irradiates light onto the workpiece, A low-magnification camera mechanism that captures a projected image of the workpiece generated by irradiation from the aforementioned light source, A beam splitter provided on the optical path of the projected image, A high-magnification camera mechanism that captures the projected image divided by the beam splitter in a narrower range than the low-magnification camera mechanism and at a higher magnification than the low-magnification camera mechanism, A display that displays a low-magnification image captured by the low-magnification camera mechanism and a high-magnification image captured by the high-magnification camera mechanism. Equipped with, The aforementioned high-magnification camera mechanism is A high-magnification imaging lens that magnifies the projected image to a predetermined magnification, A high-magnification camera that captures the magnified projection image, A high-magnification camera movement mechanism that changes the imaging position of the high-magnification camera relative to the projected image, Includes, The display is configured to allow the display position of the high-magnification image on the display to be changed. The high-magnification camera movement mechanism is configured to change the imaging position of the high-magnification camera by moving the imaging position of the high-magnification camera relative to the low-magnification camera mechanism in accordance with the change in the display position of the high-magnification image. Digital projector.

2. A process for moving the low-magnification image on the display, A process to move the high-magnification image on the display in conjunction with the movement of the low-magnification image. Configured to be executable The digital projector according to claim 1.

3. The display range of the high-magnification image is such that the center of the high-magnification image does not extend beyond the four corners of the low-magnification image. The digital projector according to claim 1 or 2.

4. The system is configured such that an intermediate focal point is formed in the optical path between the workpiece and the low-magnification camera mechanism and / or the high-magnification camera mechanism. The low-magnification camera mechanism is configured to capture either the projection image transmitted through and divided by the beam splitter or the projection image reflected and divided by the beam splitter. The high-magnification camera mechanism is configured to capture the other projection image of either the projection image reflected and divided by the beam splitter or the projection image transmitted and divided by the beam splitter. A digital projector according to any one of claims 1 to 3.

5. The digital projector according to any one of claims 1 to 4, which is configured to display the low-magnification image and the high-magnification image superimposed on the display.

6. A machine tool comprising a digital projector according to any one of claims 1 to 5.

7. A method for displaying a projected image using a digital projector according to any one of claims 1 to 5, A light irradiation process in which light is shone onto the workpiece, A low-magnification imaging step is performed in which the projection image of the workpiece generated by the light irradiation step is captured by the low-magnification camera mechanism, The high-magnification camera mechanism performs a high-magnification imaging step in which it images the projected image, which has been divided by the beam splitter, in a narrower range than the low-magnification camera mechanism and at a higher magnification than the low-magnification camera mechanism. A display step in which the low-magnification image captured in the low-magnification imaging step and the high-magnification image captured in the high-magnification imaging step are displayed on the display. A projection image display method including the following.

Images