JP2005300271A - Projection device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection device capable of performing cross line alignment accurately, based on index image. <P>SOLUTION: This device is provided with a rotating screen 3 having cross lines 31 and provided rotatably, and an index image projection optical system for projecting an image 6 onto the rotating screen 3. The image 6 comprises a bright part 61 and a line segment-shaped dark part 62 as the index image. The cross line alignment is performed, by superposing a line segment 31A constituting the cross lines 31 on the dark part 62. The line segment 31A and the dark part 62 have no parallax between them, because they are formed on the rotating screen 3 together, and the cross-line alignment can be performed accurately, and thereby the dimension measurements of a work can be performed accurately. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projection apparatus. Specifically, the present invention relates to a projection apparatus that projects an image of a workpiece onto a screen.

  A conventional projection apparatus includes a table on which a workpiece is placed, a workpiece image projection optical system that projects an image of the workpiece, and a rotary screen on which an image of the workpiece projected by the workpiece image projection optical system is projected ( For example, see Patent Document 1).

  The table is movable in two orthogonal directions (X-axis direction and Y-axis direction) on the horizontal plane. When the rotating screen is arranged in a vertical posture, when the table is moved in the X-axis direction, the image of the work projected on the rotating screen is moved in the horizontal direction (left-right direction), and the table is moved in the Y-axis direction. When moved, the image of the work projected on the rotating screen is moved in the vertical direction (vertical direction).

  The rotating screen is fitted into a circular screen frame and can be supported by the screen frame and rotated. The rotating screen has a cross line formed by two line segments orthogonal to each other. The intersection of the two line segments coincides with the rotation center of the rotating screen.

  An indicator is provided on the screen frame. This index is formed, for example, in a line segment shape facing in the vertical direction, and is formed at a position below the rotation center on the vertical line passing through the rotation center of the rotary screen. The index serves as a mark for adjusting the rotary screen to a predetermined posture. The predetermined posture refers to a posture in which two line segments forming a cross line formed on the rotary screen are oriented in the horizontal direction and the vertical direction, respectively. By appropriately rotating the rotating screen, one of the two line segments constituting the crosshair is positioned on the extension line of the line segment shape of the index. (So-called crosshair alignment).

  Further, a rotation angle detection means for detecting the rotation angle of the rotary screen and a movement amount detection means for detecting each of the movement amount of the table in the X-axis direction and the movement amount in the Y-axis direction are provided. The rotation angle of the rotary screen, the amount of movement of the table in the X-axis direction, and the amount of movement of the Y-axis direction detected in this way are displayed on the display unit.

  In this projection apparatus, an image of a workpiece can be projected on a rotating screen, and angle measurement and dimension measurement can be performed on the workpiece using the workpiece image.

  In measuring the angle, first, the table is moved as appropriate so that the apex of the measurement angle in the work image coincides with the center of the crosshair. Next, the rotary screen is rotated, and one line segment of the crosshair is rotated and moved from one straight line portion of the measurement angle to the other straight line portion. The angle of the workpiece can be measured by reading the rotation angle at this time on the display unit.

  In measuring the dimensions, first, the rotary screen is rotated with the index as a mark so that each line segment of the cross line faces in the horizontal and vertical directions, respectively. Next, the table is moved, and the workpiece image is moved by a distance corresponding to the measurement dimension using one of the cross-hairs as a mark. And the dimension of a workpiece | work can be measured by reading the movement amount of the table at this time with a display part.

JP-A-8-327313 (FIG. 2)

  In the projection apparatus described above, the index is provided on the screen frame. Since the screen frame has a thickness, the indicator is positioned in front of the screen surface of the rotary screen as viewed from the user. Therefore, there is a problem in that parallax occurs depending on the user's line-of-sight direction when performing crosshair alignment using the index as a mark. That is, if the user's line-of-sight direction is perpendicular to the screen surface of the rotating screen, no parallax occurs between the index provided on the screen frame and the crosshair on the screen surface, but the line-of-sight direction is on the screen surface. On the other hand, if it is not vertical, parallax occurs between the index and the crosshair. In such a state where parallax is generated, it is difficult to accurately perform crosshair alignment. Since the accuracy of crosshair alignment is related to the accuracy of workpiece dimension measurement, in the conventional projection apparatus having the above-described configuration, the accuracy of workpiece dimension measurement may be lowered.

  In addition, in order to perform accurate crosshair alignment, the user must face the projection apparatus and direct the line-of-sight direction perpendicular to the screen surface of the rotary screen. Depending on the installation environment of the projection apparatus, it may be difficult for the user to face the projection apparatus. Therefore, the conventional projection apparatus having the above configuration is not easy to use.

  An object of the present invention is to provide a projection device that can accurately and easily adjust a rotary screen to a predetermined posture based on an index image.

  The projection apparatus of the present invention includes a table on which a workpiece is placed, a workpiece image projection optical system that is provided so as to be relatively movable with respect to the table, and projects the image of the workpiece, and the workpiece image projection optical system projects the projection Based on the relative positional relationship between the reference mark and the reference mark, which includes a reference mark constituted by a line segment or at least two points, and a rotation screen provided so that the image of the workpiece is projected. An index image projection optical system for projecting an index image serving as an index for adjusting the rotary screen to a predetermined posture on the rotary screen is provided separately from the work image projection optical system.

  In this projection apparatus, an image of a workpiece can be projected on a rotating screen, and angle measurement and dimension measurement can be performed on the workpiece using the workpiece image.

In measuring the angle of the workpiece, first, the workpiece image is moved by appropriately moving the table and the workpiece image projection optical system as appropriate, and the vertex portion of the measurement angle of the workpiece image is made to coincide with the rotation center of the rotating screen. .
Next, the rotating screen is rotated, and the characteristic portion of the reference mark is rotated and moved from one linear portion of the measurement angle to the other linear portion. Note that the characteristic portion of the reference mark is, for example, one end point of the line segment if the reference mark is formed of a line segment, or at least one point of the reference mark is formed of a plurality of points. , Etc. Since the rotation angle of the rotary screen at this time is equal to the measurement angle, the user can measure the workpiece angle by measuring the rotation angle of the rotary screen.

When measuring the dimensions of a workpiece, first, the rotating screen is rotated using the index image projected on the rotating screen as a mark, and the rotating screen is adjusted to a predetermined posture based on the relative positional relationship between the index image and the reference mark. To do.
Here, the predetermined orientation of the rotary screen means that when the reference mark is composed of a line segment, the direction of the line segment is orthogonal to the moving direction of the workpiece image during dimension measurement. When the reference mark is composed of a plurality of points, the relationship between the direction of the line connecting two points arbitrarily selected from the plurality of points and the moving direction of the workpiece image during dimension measurement are orthogonal Say.

Next, the table and the workpiece image projection optical system are moved relative to each other, and the workpiece image is moved by a distance corresponding to the measurement dimension using the reference mark as a mark. Since the relative movement amount between the table and the workpiece image projection optical system at this time is equal to the dimension of the workpiece to be measured, the user can measure the dimension of the workpiece by measuring the relative movement amount. it can.

In the present invention, the index image is projected on the rotating screen by the index image projection optical system. Then, since both the index image and the reference mark exist on the screen surface of the rotating screen, the conventional parallax does not occur between the index image and the reference mark.
Therefore, according to the present invention, since there is no parallax between the index image and the reference mark, the operation of adjusting the rotary screen to a predetermined posture based on the relative positional relationship between the index image and the reference mark is accurately performed. It can be carried out. Accordingly, the accuracy of workpiece dimension measurement can be improved.

  In addition, according to the present invention, since there is no parallax between the index image and the reference mark, the user does not face the projection apparatus and is perpendicular to the screen surface of the rotary screen. Even without directing the line-of-sight direction, it is possible to accurately perform the operation of adjusting the rotary screen to a predetermined posture based on the relative positional relationship between the index image and the reference mark. Therefore, according to the present invention, an easy-to-use projection apparatus can be provided.

  In the present invention, the index image projection optical system includes an illumination unit and an index plate illuminated by the illumination unit, and the index plate includes a substrate and an index unit formed on the substrate, One of the substrate and the indicator portion has a light-transmitting property, and the other of the substrate and the indicator portion has a light-shielding property, and is an image of the indicator portion that is illuminated by the illumination unit and projected onto the rotating screen. Preferably constitutes the index image.

  In the present invention, the indicator plate is illuminated by the illumination means, whereby the image of the indicator portion of the indicator plate is projected onto the rotary screen to constitute the indicator image. When the indicator portion has translucency and the substrate has light shielding properties, the light emitted from the illumination means and transmitted through the indicator portion forms an indicator image on the rotary screen as it is. On the other hand, when the indicator portion has a light shielding property and the substrate has a light transmitting property, a shadow generated by the light emitted from the illumination unit being blocked by the indicator portion is projected onto the rotating screen, and the indicator image Configure.

According to the present invention, it is convenient that an index image having a desired size and shape can be projected on the rotary screen by adjusting the size and shape of the index portion on the index plate.
In addition, the size and shape of the index image are mainly determined by the size and shape of the index portion. As long as the size and shape of the index portion are determined, the size and shape of the index image are substantially constant no matter what lighting device is selected. Therefore, in the present invention, it is not necessary to use an expensive lighting device, and an inexpensive lighting device may be used. Therefore, according to the present invention, the projection apparatus can be manufactured at low cost.

  In the present invention, it is preferable that a relative movement amount detecting means for detecting a relative movement amount between the table and the workpiece image projection optical system is provided.

  In this invention, when measuring the dimensions of the workpiece, the user only needs to read the relative movement amount between the table and the workpiece image projection optical system detected by the relative movement amount detection means. Therefore, since the user does not need to measure the relative movement amount with a ruler or the like himself, according to the present invention, it is possible to reduce the work of measuring the dimension of the workpiece and to accurately measure the dimension of the workpiece. be able to.

  In the present invention, it is preferable that a rotation angle detecting means for detecting a rotation angle of the rotary screen is provided.

  In the present invention, in measuring the angle of the workpiece, the user only has to read the rotation angle of the rotary screen detected by the rotation angle detection means. Therefore, since the user does not need to measure the rotation angle with a protractor or the like, according to the present invention, it is possible to reduce the work of measuring the angle of the workpiece and accurately measure the angle of the workpiece. Can do.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a projection apparatus according to this embodiment.
In this figure, 1 is an apparatus main body, and 2 is a table on which a workpiece W is placed. The table 2 is made of glass or the like so that illumination light from a light source (not shown) provided in the lower part of the apparatus main body 1 can be transmitted upward, and can be moved up and down (Z-axis direction). And it is configured to be slidable in two orthogonal directions (X-axis direction and Y-axis direction) in a horizontal plane. The movement amounts of the table 2 in the X-axis direction, the Y-axis direction, and the Z-axis direction are detected by a table movement amount detection unit as a relative movement amount detection unit (not shown) and displayed on a table movement amount display unit (not shown). . Reference numeral 3 denotes a circular rotary screen provided rotatably. The screen surface of the rotary screen 3 is provided in the vertical plane. The rotation angle of the rotary screen 3 is detected by a rotation angle detection unit (not shown) and displayed on a rotation angle display unit (not shown). 4A to 4C are three projection lenses having different magnifications. The projection lenses 4A to 4C are detachably attached to a turret (not shown), and one of them is switched on the optical axis by turning the turret.

  The workpiece W is illuminated by the light source (not shown). Then, the light from the workpiece W illuminated in this way passes through a projection lens arranged on the optical axis and travels upward, and then a reflection mirror (not shown) provided inside the apparatus main body 1. ), The direction of travel is changed, and the rotary screen 3 is irradiated, and an image of the workpiece W is projected onto the rotary screen 3. The image of the workpiece W is an image enlarged by a projection lens arranged on the optical axis among the projection lenses 4A to 4C. As described above, the light source (not shown), the projection lenses 4A to 4C, and the reflection mirror (not shown) constitute a work image projection optical system. The table 2 is configured to be slidable in the X-axis direction and the Y-axis direction, and can be moved relative to the light source, the projection lenses 4A to 4C, and the reflection mirror. The optical system is provided so as to be relatively movable. When the table 2 is moved in the X-axis direction, the image of the workpiece W projected on the rotary screen 3 is moved in the left-right direction (in FIG. 1) on the rotary screen 3, and the table 2 is moved in the Y-axis direction. When moved in the direction, the image of the workpiece W is moved in the vertical direction (in FIG. 1) on the rotary screen 3.

  As described above, the enlarged image of the workpiece W is projected on the rotary screen 3. The rotary screen 3 has a cross line 31 as a reference mark constituted by two line segments 31A and 31B orthogonal to each other. An intersection point O between the line segment 31A and the line segment 31B coincides with the rotation center of the rotary screen 3. Therefore, when the rotary screen 3 is rotated, the crosshair 31 is rotated around O.

FIG. 2 shows a partially enlarged sectional view of a plane that bisects the rotary screen 3 into left and right (in FIG. 1). In addition, this figure expands and shows the lower part (in FIG. 1) of the rotary screen 3. As shown in FIG.
As shown in this figure, an index image projection optical system 5 for projecting an index image on the rotary screen 3 is provided. The index image projection optical system 5 is provided separately from the workpiece image projection optical system configured by the projection lenses 4A to 4C and the like.
The index image projection optical system 5 includes an LED lamp 51 as an illumination unit, and a circular index plate 52 illuminated by the LED lamp 51. Light from the LED lamp 51 is irradiated to the indicator plate 52 through the two convex lenses 53A and 53B.
The indicator plate 52 includes a substrate 521 and an indicator portion (not shown) formed on the substrate 521. The substrate 521 is made of glass or the like and has translucency. The indicator portion is a film formed by vapor deposition on the substrate 521. The indicator portion is formed in a line segment oriented in the vertical direction in FIG. 2 and has light shielding properties.
In such a configuration, when the light from the LED lamp 51 is applied to the indicator plate 52, the light applied to the indicator portion of the indicator plate 52 is blocked, while the light applied to portions other than the indicator portion is Then, the light is transmitted through the substrate 521 having translucency, and irradiated to the rotary screen 3 as it is.

FIG. 3 shows an image 6 projected on the rotary screen 3 by the index image projection optical system 5. The image 6 includes a circular bright portion 61 and a line-shaped dark portion 62 that passes through the circular central portion of the bright portion 61 and faces in the vertical direction (in FIG. 3).
The bright part 61 is formed by light transmitted from the LED lamp 51 through the substrate 521 of the indicator plate 52 and applied to the rotary screen 3.
The dark part 62 is a shadow part formed by blocking the light emitted from the LED lamp 51 to the indicator part of the indicator plate 52 by the light shielding property of the indicator part and not irradiating the rotary screen 3. It is. As described above, since the indicator portion is a line segment oriented in the vertical direction, the dark portion 62 is also formed in a line segment oriented in the vertical direction. The dark portion 62 is formed just below the rotation center O of the rotary screen 3 (in FIG. 3). That is, the rotation center O is formed on the extension line of the dark portion 62 in the line segment shape.

Subsequently, cross-hair alignment using the image 6 will be described.
Crosshair alignment is an operation performed before measuring the dimensions of the workpiece W, which will be described later, and refers to an operation for adjusting the rotary screen 3 to a predetermined posture. Specifically, either one of the line segments 31A and 31B constituting the cross line 31 formed on the rotary screen 3 is directed in the vertical direction (in FIG. 1) and the other is directed in the horizontal direction (in FIG. 1). This refers to the work of rotating the rotary screen 3. Crosshair alignment is performed based on the relative positional relationship between the dark portion 62 in the image 6 and the line segment 31A or 31B. Specifically, by rotating the rotary screen 3, either one of the line segments 31A and 31B is positioned on the extension line of the line segment shape of the dark portion 62 (hereinafter, in the case of crosshair alignment) Will be described as working so that the line segment 31A is positioned on the extension line of the line segment shape of the dark portion 62). As described above, the dark portion 62 is formed in a line segment oriented in the vertical direction, and therefore the line segment 31A located on the extension line of the line segment shape of the dark portion 62 is also directed in the vertical direction. . Since the line segment 31B is orthogonal to the line segment 31A, if the line segment 31A is oriented in the vertical direction, the line segment 31B is automatically oriented in the horizontal direction.
In the crosshair alignment operation described above, the dark portion 62 functions as an index for adjusting the rotary screen 3 to a predetermined posture. Therefore, in the present embodiment, the dark portion 62 constitutes an index image. . In other words, the dark portion 62 as an image (shadow) projected on the rotary screen 3 when the indicator portion of the indicator plate 52 is illuminated by the LED lamp 51 constitutes the indicator image.

  In the projection apparatus of the present embodiment, it is possible to perform angle measurement and dimension measurement on the workpiece W using the image of the workpiece W projected on the rotary screen 3.

The angle measurement for the workpiece W is performed by detecting the rotation angle of the rotary screen 3 by the rotation angle detection means. As an example, a case where the workpiece W has a triangular shape and the angle of one corner in the triangular shape is measured using the workpiece image Wi projected on the rotary screen 3 will be described with reference to FIG.
First, the table 2 is appropriately moved in the X-axis direction and the Y-axis direction, and the work image Wi projected on the rotary screen 3 is moved. Of the three vertices in the triangular shape of the work image Wi, one vertex for angle measurement is made to coincide with the rotation center O of the rotary screen 3, that is, the center O of the cross line 31.

Next, by appropriately rotating the rotary screen 3, a line segment 31A (or 31B) constituting the cross line 31 is superimposed on one side of the triangular shape of the work image Wi (a line drawn by a solid line in FIG. 4). State of minute 31A). At this time, the rotation angle of the rotary screen 3 displayed in the rotation angle display unit (not shown) is set to zero.
Subsequently, by rotating the rotary screen 3, the line segment 31A is rotationally moved around O, and is superimposed on the other side of the triangular shape of the work image Wi (the line segment 31A drawn with an imaginary line in FIG. 4). State). The rotation angle of the rotary screen 3 at this time is equal to the measurement angle θ in the work image Wi. The angle θ is detected by a rotation angle detection means (not shown) and displayed on a rotation angle display unit (not shown), so that the user can measure the angle of the workpiece W.

In addition, the dimension of the workpiece W is measured by detecting the amount of movement of the table 2 in the horizontal plane (X-axis direction, Y-axis direction) by table movement amount detection means (not shown). As an example, a case where the workpiece W has a triangular shape and the height dimension in the triangular shape is measured using the workpiece image Wi projected on the rotary screen 3 will be described with reference to FIG.
First, the above-described cross line alignment is performed in advance so that the line segment 31A is directed in the vertical direction (in FIG. 5) and the line segment 31B is directed in the horizontal direction (in FIG. 5). At this time, as described above, the line segment shape of the dark portion 62 of the image 6 is superimposed on the line segment 31A.

  Next, the table 2 is appropriately moved in the X-axis direction and the Y-axis direction, and the work image Wi projected on the rotary screen 3 is moved. Then, the apex P relating to the height measurement in the triangular shape of the work image Wi is made to coincide with the intersection O of the line segments 31A and 31B (the state of the work image Wi drawn with a solid line in FIG. 5). At this time, the side E facing the apex P in the triangular shape is made parallel to the line segment 31A. In this state, the X-axis direction movement amount of the table 2 displayed in the table movement amount display section (not shown) is set to zero.

  Subsequently, the work image Wi projected on the rotary screen 3 is moved in the left direction (in FIG. 5) by moving the table 2 in the X-axis direction. Then, the side E in the triangular shape of the work image Wi is overlapped with the line segment 31A. At this time, the movement amount of the work image Wi is equal to the dimension L shown in FIG. The dimension L is equal to the height dimension (distance between the vertex P and the side E) in the triangular shape of the work image Wi. Therefore, the table 2 moves in the X-axis direction by a distance equal to the height dimension of the workpiece W in the triangular shape. Then, the movement amount of the table 2 in the X-axis direction is detected by a table movement amount detection means (not shown) and displayed on a table movement amount display unit (not shown). Can be measured (in the above example, the height of the workpiece W in a triangular shape).

  In the above example, the table 2 is moved in the X-axis direction in order to measure the dimension of the workpiece W using the line segment 31A directed in the vertical direction (in FIG. 5). In the embodiment, the dimension of the workpiece W can also be measured using the line segment 31B directed in the left-right direction (in FIG. 5). In this case, the table 2 may be moved in the Y-axis direction, and the work image Wi may be moved in the vertical direction on the rotary screen 3. At this time, the moving direction (vertical direction) of the workpiece image Wi and the dimension measurement direction using the line segment 31B (the direction orthogonal to the line segment 31B, that is, the vertical direction) match, so the line segment 31B is used. Thus, the dimension of the workpiece W can be measured.

  In the dimension measurement, it is important to accurately perform the crosshair alignment described above. If the crosshair alignment is inaccurate, accurate dimension measurement cannot be performed. For example, when the crosshair alignment is inaccurate and the line segment 31A is oriented in a direction shifted from the vertical direction (in FIG. 5), the work image Wi is moved to the left by moving the table 2 in the X-axis direction. Even if it is moved (in FIG. 5), the moving direction (left direction) of the workpiece image Wi and the direction of the line segment 31A (direction shifted from the vertical direction) are not orthogonal. Therefore, since the moving direction (left direction) of the workpiece image Wi and the dimension measuring direction using the line segment 31A (direction perpendicular to the direction of the line segment 31A) do not coincide with each other, accurate dimension measurement cannot be performed. In the present embodiment, as described above, the cross line alignment can be accurately performed using the dark portion 62 of the image 6, so that there is no such problem, and the dimension measurement can be accurately performed.

According to this embodiment, there are the following operations and effects.
(1) In this embodiment, the dark part 62 of the image 6 projected on the rotary screen 3 by the index image projection optical system 5 functions as an index image. Therefore, the dark part 62 as the index image exists on the rotary screen 3. Then, since the dark portion 62 as the index image and the cross line 31 as the reference mark are both present on the rotary screen 3, a conventional projection apparatus is provided between the dark portion 62 and the cross line 31. The parallax as in is not generated.
Therefore, according to the present embodiment, since there is no parallax between the dark portion 62 and the crosshair 31, the above crosshair alignment operation can be performed with high accuracy. And in connection with it, the precision of the dimension measurement of the workpiece | work W can be improved.

  (2) Further, according to the present embodiment, since there is no parallax between the dark portion 62 and the crosshair 31, the user does not face the projection apparatus, and the screen of the rotary screen 3 Even if the line-of-sight direction is not directed perpendicularly to the surface, the line-segment-shaped dark portion 62 and one of the two line segments 31A and 31B constituting the cross line 31 are accurately overlapped in the cross-hair alignment operation. Can be matched. Therefore, according to the present embodiment, it is possible to provide a user-friendly projection device.

  (3) The size and shape of the dark portion 62 as the index image is determined by the size and shape of the index portion of the index plate 52. Therefore, the size and shape of the dark part 62 are hardly affected by the selection of the illumination device to be used. For this reason, in this embodiment, an inexpensive LED lamp 51 is employed as the illumination device, so that the projection device can be manufactured at low cost.

  (4) According to this embodiment, as described above, by reading the value of the dimension of the workpiece W detected by the table movement amount detection means and displayed on the table movement amount display unit, the user You can know the dimensions. Therefore, since the user does not need to measure the movement amount of the table 2 with a ruler or the like for measuring the dimension of the workpiece W, the user can reduce the work of measuring the dimension of the workpiece W, and Dimension measurement can be performed accurately.

  (5) According to the present embodiment, as described above, the user can directly read the angle in the workpiece W detected by the rotation angle detection means and displayed on the rotation angle display unit. Therefore, since the user does not need to measure the rotation angle of the rotary screen 3 with a protractor or the like in order to measure the angle of the workpiece W, the user can reduce the work of measuring the angle of the workpiece W. The angle measurement of W can be performed accurately.

  (6) In the present embodiment, the index image projection optical system 5 projects the image 6 on the rotary screen 3. At this time, the dark portion 62 that functions as the index image in the image 6 is surrounded by the bright portion 61 as shown in FIG. Therefore, even when the projection apparatus of the present embodiment is used in a dark place, the user can clearly see the dark part 62 surrounded by the bright part 61. Then, even in a dark place, the user can perform cross-hair alignment using the dark part 62 as an index, and can measure the dimensions of the workpiece W.

(7) As a configuration for projecting the index image on the rotary screen 3, in addition to the configuration of the present embodiment including the index image projection optical system 5, for example, the light is shielded on a glass table on which a workpiece is placed. It is conceivable to form an indicator portion having the characteristics, illuminate the workpiece and the indicator portion by illumination means provided below the table, and project the workpiece image and the indicator image onto the rotating screen. In this configuration, the projection of the workpiece image and the projection of the index image are performed by one optical system.
However, in this configuration, when the work is placed on the index portion formed on the table, the index image is hidden by the work image on the rotating screen, so that the user can display the index image. There is a problem that it becomes impossible to see.
On the other hand, in this embodiment, the index image projection optical system 5 is provided separately from the optical system (projection lenses 4A to 4C, etc.) for projecting the image of the workpiece W. Therefore, the index image (dark portion 62) is not lost due to the work image Wi. In particular, even when the work image Wi and the image 6 overlap each other on the rotary screen 3, the dark image 62 is surrounded by the bright portion 61, so that the user can recognize the work image Wi. Regardless, the dark portion 62 can be visually recognized, and crosshair alignment can be performed.

It should be noted that the present invention is not limited to the above-described embodiments, and modifications, improvements, and the like within the scope that can achieve the object of the present invention are included in the present invention.
For example, in the above embodiment, the reference mark formed on the rotary screen 3 is the cross line 31. However, in the present invention, the reference mark is constituted by a line segment or at least two points. Anything is acceptable. For example, a line consisting of a single line, a dotted line, a so-called zigzag line, in which each line constituting the dotted line is arranged in a staggered pattern, or composed of two or more points For example, various marks can be adopted as the reference marks. These reference marks have a predetermined posture with respect to the movement direction of the work image Wi at the time of dimension measurement (for example, when the reference mark is composed of one line segment, the movement direction of the work image Wi and the reference direction (The posture in which the line segment shape of the mark is orthogonal) can be used for measuring the dimensions of the workpiece W.

  Moreover, in the said embodiment, although the board | substrate 521 of the parameter | index plate 52 was provided with translucency and the parameter | index part was provided with light-shielding property, the reverse may be sufficient in this invention. That is, the substrate 521 may have a light shielding property, and the indicator portion may have a light transmitting property. In this case, the light emitted from the LED lamp 51 and transmitted through the indicator portion of the indicator plate 52 forms a bright portion in a line segment shape (vertical direction in FIG. 3) on the rotary screen 3. The bright portion functions as an index image as described above.

  In the above embodiment, the indicator plate 52 is circular. However, in the present invention, the shape of the indicator plate 52 is not limited to a circle, and may be, for example, a rectangular shape. Note that the shape of the dark portion 62 as the index image is determined by the shape of the index portion formed on the index plate 52 and is irrelevant to the shape of the index plate 52 itself.

  In the present invention, the indicator portion formed on the indicator plate 52 is not limited to a line segment as in the above embodiment. For example, the index portion may be a dot shape, a circle shape, or the like. In short, any shape may be used as long as the crosshair alignment can be accurately performed using the index portion. In particular, according to the present invention, an index image having a desired size and shape can be projected onto a rotating screen by adjusting the size and shape of the index portion.

  In the above-described embodiment, the table 2 is configured to be movable in the X-axis direction and the Y-direction. However, in the present invention, instead of the table 2 being configured to be movable, a work image projection optical system is provided. The projection lenses 4A to 4C and the like may be movable. Moreover, it is good also as a structure which can move both the table 2 and a workpiece | work image projection optical system. In either case, the table 2 and the work image projection optical system are configured to be relatively movable.

  In the embodiment, the index image projection optical system 5 including the index plate 52 is used to project the index image on the rotary screen 3. However, in the present invention, the index plate 52 is not provided and the fiber is used. A bright part may be formed on the rotary screen 3 by directly irradiating the rotary screen 3 with light by an illumination device such as an illumination device, and this bright part may be used as an index image. In particular, if a fiber illumination device is used, a light beam having a small cross-sectional area can be emitted, so that an index image having a small area can be projected. If the area of the index image is small, the operation of adjusting the rotary screen to a predetermined posture based on the relative positional relationship between the index image and the reference mark can often be performed more precisely. That is, if the area of the index image is large, uncertainty will occur when the reference mark is positioned based on the index image, but if the area of the index image is small, the positioning can be made accurately. And by being able to position accurately, the precision of the dimension measurement of a workpiece | work can be raised.

  In the above embodiment, the table 2 is configured to be movable in two directions of the X-axis direction and the Y-axis direction in the horizontal plane. However, in the present invention, for example, the table 2 is further arranged in the vertical direction. The structure which can be rotated in a horizontal plane centering on a rotating shaft may be sufficient. Since the work image Wi can be rotated on the rotary screen 3 by rotating the table 2, the posture of the work image Wi on the rotary screen 3 must be adjusted when measuring the dimensions of the work W, etc. Convenient to.

  Moreover, in the said embodiment, although the screen surface of the rotary screen 3 was provided in the vertical surface, in this invention, for example, the screen surface may be provided in the horizontal surface, You may provide in the plane which makes the normal line the straight line which makes an angle, such as 30 degree, 45 degrees, or 60 degrees, with the perpendicular direction.

  INDUSTRIAL APPLICABILITY The present invention can be used for projecting a workpiece image and measuring the angle and dimensions of a workpiece using the projected workpiece image.

The perspective view which shows the projector concerning one Embodiment of this invention. FIG. 3 is a partial enlarged cross-sectional view showing a rotary screen and an index image projection optical system in the projection apparatus according to the embodiment. The partial enlarged front view which shows the rotary screen in the projection apparatus concerning the said embodiment. The figure which shows the procedure for measuring the angle of a workpiece | work using the projection apparatus concerning the said embodiment. The figure which shows the procedure for measuring the dimension of a workpiece | work using the projection apparatus concerning the said embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Apparatus main body 2 ... Table 3 ... Rotary screen 5 ... Index image projection optical system 31 ... Crosshair 52 ... Index plate 61 ... Bright part 62 ... Dark part Wi ... Work image

Claims (4)

A table on which the workpiece is placed;
A workpiece image projection optical system that is provided so as to be movable relative to the table and projects an image of the workpiece;
An image of the workpiece projected by the workpiece image projection optical system is projected, and has a reference mark constituted by a line segment or at least two points, and a rotary screen provided rotatably.
An index image projection optical system that projects an index image serving as an index for adjusting the rotary screen to a predetermined posture on the rotary screen based on a relative positional relationship with the reference mark is the workpiece image projection optical system. Is a separate projection device. The projection device according to claim 1,
The index image projection optical system includes an illumination unit and an index plate illuminated by the illumination unit,
The indicator plate includes a substrate and an indicator portion formed on the substrate,
Either one of the substrate and the indicator portion has translucency,
The other of the substrate and the indicator portion has a light shielding property,
The projection apparatus characterized in that an image of the indicator portion illuminated by the illumination means and projected onto the rotary screen constitutes the indicator image. The projection apparatus according to claim 1 or 2,
A projection apparatus, comprising: a relative movement amount detection means for detecting a relative movement amount between the table and the workpiece image projection optical system. The projection apparatus according to any one of claims 1 to 3,
A projection apparatus comprising rotation angle detection means for detecting a rotation angle of the rotary screen.

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