JPS5965705A - Device for measuring size of processed parts - Google Patents

Abstract

PURPOSE:To avoid an artificial error of measurement and to eliminate the movement of an object to be measured owing to vibrations, etc. generated during the measurement by mechanizing a universal projector by means of a photoelectric scanner and a video monitor. CONSTITUTION:An overall photoelectric scanner 7 reads the whole of an object 1 to be measured and projects an entire image of the object 1 to an overall video monitor 12. Furthermore the terminal parts of measurement are indicated by means of crucial marks 37, 38, etc., and the distance is calculated by a central processor 24 between the measuring terminal part and a reference point, i.e. the intersecting point of horizontal and vertical bright lines 32 and 35. At the same time, only the measuring terminal part is read by a magnifying photoelectric scanner 8. The (x)-(z) tables 9-11 can be automatically moved so that the point of measurement is formed an image at the center of screen of a magnified video monitor 14. At the same time, both scanners 7 and 8 are connected fixedly to the tables 9-11 and moved. Thus, the movement of the object 1 on a table 2 is eliminated. The size of the object 1 can be measured with indications of the crucial marks when the object 1 is projected within a 1/4 area of the monitor 12.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dimension measuring device for workpieces and the like.

Conventionally, this German dimension measuring device includes a universal projector.

When measuring the distance between two points, a universal projector enlarges and projects the image of the object placed on a stage that can be moved in the x and y directions of an orthogonal standalone system onto a screen to determine the measurement point. Measurements have been carried out by sequentially moving an x and y table to accurately match a reference line on a screen, and then quantifying and displaying the amount of movement. Such a universal projector has the following drawbacks.

(a) The operator must make fine adjustments to the stage to visually align the measurement end of the image with the reference line of the screen, which takes time for measurement.

(b) Artificial measurement errors due to visual measurements by workers are likely to occur.

(C) Since the object to be measured is placed on a stage consisting of an There must be.

(d) When it is desired to continuously and automatically measure multiple points on the object to be measured, automatic measurement is not possible because fine adjustment work is required by visual inspection.

The BA of this invention is a mechanized version using a photoelectric scanner and a video monitor in order to eliminate the drawbacks of the above-mentioned universal projector, and has the following features.

(a) By indicating the location of the measurement point of the object to be measured,
This enables measurement by automatic edge recognition.

(b) Continuous automatic measurement a- was made possible by a combination of a computer, photoelectric scanner, and x, y, and X tables.

(c, l The mechanization of the front 6 parts prevented the interference of internal measurement errors.

(d) By adopting a fixed method for the stage, movement of the object to be measured due to vibrations during measurement is completely eliminated.

The present invention utilizes an entire photoelectric scanner (7
) to read the entire object to be measured (1), and
The overall image of step 1) is presented to the overall image monitor (12), and furthermore, the measuring end is indicated by means such as a cross mark, and the distance from the reference point is counted. In order to ensure measurement accuracy, only the measurement end of the object to be measured (1) is read by the magnifying photoelectric scanner (8), and the measurement point of this measurement end image is focused on the center of the screen of the magnification video monitor (14). so that X% Y%
The X tables (9), (10), and (11) can now be moved automatically.

Father, X % Y % X table (9), 00), (1
This is a measuring device in which a whole photoelectric scanner (7) and an enlarged photoelectric scanner (8) are fixedly connected to and move to 1), and the object to be measured (1+) on the stage 2 does not necessarily move.

The object to be measured (1) has a three-dimensional shape, and its measurement end (d
, shall have a straight or curved shape. Loading table (2)
is transparent, and the object to be measured (1) is mounted thereon. An enlarged image of the measuring end of the object to be measured (1) is obtained by an enlarged photoelectric scanner (8) through a half mirror (4) located 1μ opposite to the stage (2), and then binarized. The circuit (15) and the processing circuit +lli+ are operated to display the image on the enlarged video monitor (14). The whole image of the treasure (++ is half mirror (4)).
The entire image is reflected by the photoelectric scanner 7 and displayed on the overall image monitor (12) via the circuit (13). Processing circuit (1
6) is an enlargement of the horizontal bright line (421) and vertical bright line (41) as shown in Figure 5 (14). At the same time, the image is shown on the video monitor as shown in Figure 3, and the noise removal process of the binarized image is performed. It is something to do.

Full-body photoelectric scanner (7) and enlarged photoelectric scanner (8)
is firmly connected to the X table (9). X table (9) is added to X table (10),
) is fixed to the X table (marked), so the composite M1 work of the tables of and 71. et al.
8).

Whole photoelectric scanner (7) and enlarged photoelectric scanner (8)
Although there are many known main elements,
Here, a two-dimensional area sensor consisting of a two-dimensional diode matrix will be explained and applied.

The binarization circuit (15) photoelectrically converts the grayscale information of the video 1-bore, so it separates what is output as a voltage into the low level and high level, and the magnified Hozuka monitor (]= Il+'This is a circuit that displays only a combination image of white or black, and this is also a known circuit or exists.Lighting device (3) c. Whole photoelectric scanner (7) 1.
・Providing appropriate photoelectric power to the magnifying photoelectric scanner (8) will work.

Interface +231・B, cross mark generation circuit,
It consists of a horizontal master line source circuit and a vertical bright line teacher circuit, and is responsible for transferring information from the binarization circuit (15) and processing circuit 06) to the central processing unit ft (241).
The drive circuits (17), 08), and (19) of the y,
Flood, (2I), is controlled by ci21. The entire image is loaded into the photoelectric scanner (7) and the entire image monitor (
The viewpoints of the optical axis center, or origin 0, of the image projected in 12) and the optical axis center, or origin 0', of the image read by the enlarged photoelectric scanner (8) and displayed on the enlarged image monitor (1=l) are as follows: are on the same axis.

The conosole (25) is equipped with a switch on the car. (not shown). By operating these console switches, the enlarged photoelectric scanner (8) fixed to the X table (9), the entire photoelectric scanner (force, X, y, z
! I! It is possible to move freely in the I+1 direction.

The cross marks t3/l, (381) on the overall video monitor (12) shown in FIGS. 2 and 4 can be moved freely by operating a switch for moving the cross marks (not shown) or the like. The positions of the cross marks (37) and (38) on the overall video monitor, the horizontal bright line (32j) and the vertical bright line (3
5) How far is X' from the intersection 0 of 3' table (9),
The central processing unit (24) can determine whether the object is far away in terms of the amount of movement (10).

The entire photoelectric scanner (7) and the enlarged photoelectric scanner (8) can be controlled by X%3' while executing measurements according to the program instructions of the central processing unit (,!, +1) without operating any switches on the console (25). % It is also possible to move in the Z direction.The object to be measured (1) on the overall video monitor (12)
) 611j fixed end part with a light pen etc. 1f
From this, x, y, X table (9), (1 (11, (1
1), it is also possible to move the overall photoelectric scanner (7) and the enlarged photoelectric scanner (8).

Regarding the principle of dimension measurement of the present invention ('i, Figs. 7 and 8)
This will be explained in more detail according to the figures. FIG. 8 is for the purpose of simplifying the explanation of the object to be measured (1) directly related to the IL1 foot in FIG. There is actually a magnifying lens in the middle. This diode matrix (8) moves in synchronization with the X table, the X table, and the X table. The length S of the tool in the X direction of the object to be measured 1 is X! When the amount of movement of the table (9) is half, and the coordinates of the corresponding black and white changing points as a binary image from the center O' of the diode matrix (8)' are ayb, then S-ho (a - b ) --- Represented by (]). X table is subject to 1] The image of a constant object is a guiotomatrix (8)
Move up to form an image.

Figure 7 shows the output signal from the first row of the diode node (near the horizontal bright line (42) of the diode node (8)) and the output signal corresponding to the defined end (q)... d11] of the part. The output signal from the diode matrix (8) is sorted into "0" or "11" at the thren7jort level shown by the dotted line (rOJf is the low level voltage, "1 " is a high level voltage). In other words, the image is binarized. Origin 0
If it is determined that the time corresponding to the position ' or after the start of horizontal scanning is to time after the start of the horizontal scanning, the n binary signals P1'01 generated before that time are Corresponds to the # distance in 1). The signal processing at the measurement end p is also similar, and since almost the same principle and method can be applied to the measurement in the y-axis direction, the explanation will be omitted.

The operation will be explained below according to the measurement order. At the start of the measurement, the X-table (91If) (attached entire photoelectric scanner (7), enlarged photoelectric scanner (8)) was at the start position (not shown) and was mounted on the stage (2). The mound of the object to be measured (1) appears in the lower left half of FIG.
It is shown that each operation of 0) is at the starting reference position or the leftmost position. In this way, the cross mark (371, (3
Dimension measurement according to instructions such as 81 is possible when the object to be measured (1) is projected in an area of 1/4 of the entire mound monitor uzr.

When measuring the distance S in the X direction of the measuring end l) and q shown in Fig. 2, the measuring end i1 is used to cut off the cross mark [37].
+ p Ul) move closer. At this time, the position of the 1.2 mark (37) is...]j Treasure measuring end p t, tC
It is not necessary to make the former omniscient. The cross mark (38) also moves close to the measuring end q. Figure 4 (at shows the state in which this Senju Marri (371, (3al) has been moved to the end of the object to be measured.Next, start measurement from the switch (not shown) on the console (2). When a command is given, the entire photoelectric scanner 7 and the enlarged photoelectric scanner (8) move in accordance with the instructions from the central processing unit (24), and the state shown in FIG. 4(b) is displayed on the entire image monitor fil.

By the operation of the above-mentioned goo-auto matrix (8), the coordinate a when the center of the above-mentioned diode matrix (8) is set as the origin O' is opened. At this time, the measurement end p of the object to be measured (1) is projected on the enlarged image monitor (1=jl) as shown by diagonal lines in FIG. 5(b).

(41) In Fig. 5(b), the defining end p appears slightly to the right of the vertical emission line, and this is accompanied by the cross mark (37) or the object to be measured (1) in Fig. 4(b). This indicates that the direction is directed to the left IUII of the page from the end p.

FIG. 6(a) shows the two-dimensionally arrayed diode matrix in the enlarged photoelectric scanner (8) when the image of the object 111111 shown in FIG. 5(b) appears on the enlarged image monitor (I). Correspondence with Lynx (8) is shown. When related to dimension measurement in the X direction, a two-dimensional array diode matrix (
Water (42) of 8) is used in one row of diode matrix elements near Hiraki MM. Although the use of an automatrix has been discussed, all the binarized information of all elements of the two-dimensional array of diode matrices (8)' may be processed by the central processing unit 24).

1) If the central processing unit 24 recognizes that the part of one row of the two-dimensional array diode matrix (8)' that is illuminated by light is "1" and the part that is not illuminated by light is "10", then "1" is set. The central processing unit ρ·1) recognizes that the change point of the continuous part of "0" from the series of "0" is the measurement end p of the foot 1141 to be measured (1). At the time of measurement, the distance this change point is from the origin O' is counted and the distance al distance is determined. Figure 4(C) and O/Figure 5(c) are
Body, X,, y,, X table (9), (10), where the central processing unit (2.1) has memorized the blood by measuring the measurement end p.
When (11) operates and point q is near the origin O',
The states of the overall video monitor (12) and enlarged video monitor 04) are shown respectively.

FIG. 6(b) shows the relationship between the portions that are illuminated by light and the portions that are not illuminated in one row of the two-dimensional array diode matrix (8) in the enlarged photoelectric scanner (8). Figure 6 (a
), the central processing unit C, 241: can recognize the vertical bright line habit and the distance difference at the measuring end q1. Here, X1! 7%, when the amount of movement in the X direction of the X tables (9), (10), and (11) is half, the distance S in the X direction of the object to be measured (1) is as described above! It is possible to obtain it from S=ho(a-b).

It is also possible to measure dimensions in the X direction based on the same principle. Figure 6(c) shows one of the two-dimensional array diode matrix in the magnifying photoelectric scanner (8).
The columns show the relationship between areas that are exposed to light and areas that are not.

The measurements described above are performed by pointing the edge of the object to be measured by the measurer or by indicating the vicinity using a cross mark (37), (381, etc.).However, when processing the object to be measured, Since the shape and dimensions to be machined are given in advance, it is possible to use that information, that is, the machined dimension data, as the dimension measurement data based on the present invention. Give the measurement edge data of the object to be measured (1), align the measurement edge with the approximate center of the enlarged photoelectric scanner (8) one after another, and use the dimension meter 61.
1]. In this case, the operator does not have to indicate the measurement end using a cross mark or the like.

The reason why such a large number of measurement points can be measured at once is that Honjutsu employs a method that allows for highly accurate dimension measurements based on rough positional instructions.

As is clear from the above situation, the workpiece size measuring device according to the present invention allows the measurement end of the workpiece to be placed within the field of view of the enlarged photoelectric scanner. ,
Since the X-table is moved, it is possible to measure the dimensions of large objects that cannot be scanned and read by an enlarged photoelectric scanner. Furthermore, since measurements can be made without moving the object to be measured, measurement errors due to vibrations and the like do not occur. moreover,
Regarding measurement, since there is no judgment process by the measurer, not only can the quality of dimension measurement be improved, but also automatic dimension measurement between multiple points is possible by using processing information.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of the present invention. FIG. 2 shows the screen of the overall video monitor (12). Figure 6 shows the enlarged video monitor (I) in the same state as Figure 2.
This is the screen of 4). Figure 4 (a) (b) (c) shows the overall video monitor (12
FIG. 3 is a diagram showing the movement of the object to be measured 1 as the measurement progresses in the image of J. FIGS. 5(a) and 5(b) are diagrams of screen images of the enlarged monitor 04 (cl is the enlarged monitor 04 corresponding to the screen of the overall video monitor 12 in FIG. 4). Fig. 6(a) (bl(c) fd) These are diagrams for explaining in detail the method of measuring the end face of the object to be measured. Fig. 7 shows the position of the measuring end from the signal from the enlarged photoelectric scanner (8). Fig. 8 is an explanatory diagram of the counting method. Fig. 8 is an explanatory diagram of the measurement principle. (1) Object to be measured (2) Stage (3) Illumination device (4) Half mirror (5) Total reflection mirror (7 ) Entire photoelectric scanner (8) Enlarged photoelectric scanner (9) X table (IIJI: Y table old) X table
(12) Overall video monitor (14) Enlarged video monitor (
15): Binarization circuit (13) and (I6) processing circuit 07) and (18j and 09) 1 drive circuit (2t11 and (
21) and (2), control circuit (23) interface (24): central processing unit (25) connor (35) and (41) vertical emission line (37J and (4)
21: Horizontal bright line (37) and (38) are cross marks. Nu7-tl! Rumataya figure 7

Claims (1)

[Claims] (1) Means for indicating a rough measurement point on a video monitor image of the object to be measured read by a photoelectric scanner that scans the object to be measured, and means for displaying the indicated point on the p-video monitor with a cross mark or the like. , a dimension measuring device having means for always moving the measuring end into the center of the photoelectric scanner. (2. The dimension measuring device according to claim 1, which includes an entire photoelectric scanner and an enlarged photoelectric scanner,
A dimension measuring device that does not move the object to be measured.