JPH04102010U - position measuring device - Google Patents

Abstract

(57) [Summary] [Purpose] The purpose of the present invention is to provide a position measuring device that has a simple configuration and is capable of highly accurate position measurement. [Structure] The present invention arranges a pair of slit plates 2 and 3 in parallel on a moving body 1 that moves in a straight line, and images light from the moving body 1 through the slit plates 2 and 3. The position of the moving object 1 is determined by taking an image with a camera 4 and calculating the light pattern in a calculation section 5. [Effects] According to the present invention, the light pattern on the imaging camera is displayed with the position of the moving object enlarged, so that the positional accuracy is improved.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea relates to a position measuring device that measures the position of a moving object moving in a straight line. do.

0002

[Conventional technology]

Normally, the position of a moving object moving in a straight line is determined by a linear encoder or a drive. Using a rotary encoder attached directly or indirectly to the moving shaft, It is calculated from the amount of movement from the origin position. Perform the above measurements more precisely In order to improve position accuracy, the encoder signal is usually finely differentiated. ing.

0003

[Problem that the idea aims to solve]

In the above measurement method, based on the signal obtained by finely dividing the encoder signal, The smaller the amount of movement you want to measure, the finer the signal. We have to differentiate. For this reason, extremely precise processing techniques are required to make encoders. Techniques are required, and price is also an effect.

0004

[Means to solve the problem]

The precision position measuring device in this invention is based on the movement path of a moving object that moves in a straight line. A pair of slits with many transparent slits of equal width and equal intervals arranged parallel to each other. The light pattern emitted from the moving object is captured through the cut plate and this pair of slit plates. The position of the moving object is determined from the imaging camera that captures the image and the light pattern signal obtained by the imaging camera. The present invention is characterized by comprising an arithmetic unit that calculates the position.

[0005]

[Effect]

According to the present invention, light from a moving object is passed through multiple slit plates to an imaging camera. The object's position can be determined from the light pattern.

[0006]

【Example】

An embodiment of this invention will be described below with reference to FIG. In Figure 1, 1 is indicated by L in the diagram. 2 is a moving object moving in a straight line, and 2 is arranged parallel to the moving path of moving object 1. The first slit plate has a large number of light-transmitting slits of equal width arranged at equal intervals. 3 is the second The slit plate is the same as the first slit plate 2 and is arranged parallel to the first slit plate 2. It is placed. 4 is emitted from the moving body 1 via the first and second slit plates 2 and 3. 5 is a light pattern signal obtained from the imaging camera 4. 2 shows a calculation unit that calculates the position of the moving body 1 from the above. 6 displays the calculation result of the calculation unit 5; A display section that displays the optical pattern signal 7 as necessary is shown.

[0007] The operation of this device will be explained below with reference to FIGS. 2 to 7. First, the position in Figure 2, that is, the origin If the moving body 1 is located at a distance D1 from the position, the light from the moving body 1 is A light pattern is generated on the imaging surface of the imaging camera 4 through the two slit plates 2 and 3. So The light pattern becomes the state shown in FIG. Similarly, moving body 1 moves a minute distance and is shown in Fig. 4. As shown, when the light comes to the distance D2 position from the origin position, the light pattern becomes as shown in FIG. Further, as shown in FIG. 6, when the distance D3 from the origin position is reached, the optical pattern shown in FIG. It becomes This light pattern has uniform pattern changes between adjacent transparent slits. In order to The position between the slits can be known. Also, the positions of adjacent light patterns It can be determined from any slit position from the origin position, and the position of moving object 1 can be specified. Can be determined.

[0008] According to this device, the slit plates 2 and 3, the moving body 1, and the imaging camera 4 are connected to each other. The interval increases the interval between the light patterns on the imaging camera 4 compared to the slit interval. It is possible to improve the position measurement accuracy.

[0009] The slit plates 2 and 3 are made of transparent glass with photoresist etc. on both sides. It is also possible to use a sheet formed with a sheet.

0010

[Effect of the idea]

As explained above, this idea inserts a slit plate between the moving object and the imaging camera. By using the If this is applied to position measurement, precise positioning can be achieved without using expensive encoders. This also improves reliability.

[Submission date] December 10, 1991

[Procedural amendment 2]

[Name of document to be amended] Specification

[Correction target item name] Full text

[Correction method] Change

[Correction details] [Detailed explanation of the idea] [Industrial application field]

This idea relates to a position measuring device that measures the position of a moving object moving in a straight line. do.

[Conventional technology]

Normally, the position of a moving object moving in a straight line is determined by a linear encoder or a drive. Using a rotary encoder attached directly or indirectly to the moving shaft, It is calculated from the amount of movement from the origin position. Perform the above measurements more precisely In order to improve position accuracy, the encoder signal is usually finely differentiated. ing.

[Problem that the idea aims to solve]

The above measurement method uses the signal obtained by finely dividing the encoder signal to We are measuring small amounts of movement, and the smaller the amount of movement we want to measure, the stronger the signal will be. Must be subdivided. For this reason, extremely precise Processing technology is required and the price is also high.

[Means to solve the problem] The precision position measuring device in this invention is based on the movement path of a moving object that moves in a straight line. A pair of slits with many transparent slits of equal width and equal intervals arranged parallel to each other. The light pattern emitted from the moving object is captured through the cut plate and this pair of slit plates. The position of the moving object is determined from the imaging camera that captures the image and the light pattern signal obtained by the imaging camera. The present invention is characterized by comprising an arithmetic unit that calculates the position.

[Effect]

According to the present invention, light from a moving object passes through multiple slit plates and onto the imaging camera. A light pattern that is uniquely determined for the position of the moving object is mapped onto the image and recorded in advance in the calculation section. Comparison with the stored light pattern becomes possible.

【Example】

An embodiment of this invention will be described below with reference to FIG. In Figure 1, 1 is indicated by L in the diagram. 2 is a moving object moving in a straight line, and 2 is arranged parallel to the moving path of moving object 1. The first slit plate has a large number of light-transmitting slits of equal width arranged at equal intervals. 3 is the second The slit plate is the same as the first slit plate 2 and is arranged parallel to the first slit plate 2. It is placed. 4 is emitted from the moving body 1 via the first and second slit plates 2 and 3. 5 is a light pattern signal obtained from the imaging camera 4. 2 shows a calculation unit that calculates the position of the moving body 1 from the above. 6 displays the calculation result of the calculation unit 5; A display section that displays the optical pattern signal 7 as necessary is shown. The operation of this device will be explained below with reference to FIGS. 2 to 7. First, the position in Figure 2, that is, the origin If the moving body 1 is located at a distance D1 from the position, the light from the moving body 1 is A light pattern is generated on the imaging surface of the imaging camera 4 through the two slit plates 2 and 3. So The light pattern becomes the state shown in FIG. Similarly, moving body 1 moves a minute distance and is shown in Fig. 4. As shown, when the light comes to the distance D2 position from the origin position, the light pattern becomes as shown in FIG. Further, as shown in FIG. 6, when the distance D3 from the origin position is reached, the optical pattern shown in FIG. It becomes This light pattern has uniform pattern changes between adjacent transparent slits. In order to You can know the location. According to this device, the alternating intervals between the slit plates 2 and 3, the moving body 1, and the imaging camera 4 are By this, the interval of the light pattern on the imaging camera 4 is expanded for a fixed slit interval. It is possible to improve position measurement accuracy. The slit plates 2 and 3 are made of transparent glass with photoresist etc. on both sides. A pair of slit plates may be used, and a pair of slit plates may be used. so that the transparent slits intersect at right angles when observed from the direction of the light source. If arranged, it becomes possible to grasp the position of the light source 1 two-dimensionally.

[Effect of the idea]

As explained above, this idea inserts a slit plate between the moving object and the imaging camera. By using the If this is applied to position measurement, precise positioning can be achieved without using expensive encoders. This also improves reliability.

[Brief explanation of drawings]

[Figure 1] Drawing showing an embodiment of the present invention

[Figure 2] Plan view explaining the operation of the device of the present invention

[Figure 3] Light pattern diagram in the state shown in Figure 2

[Fig. 4] Plan view explaining the operation of the device of the present invention

[Figure 5] Light pattern diagram in the state shown in Figure 4

[Fig. 6] Plan view explaining the operation of the device of the present invention

[Figure 7] Light pattern diagram in the state shown in Figure 6

[Explanation of symbols]

1 Mobile object 2 Slit plate 3 Slit plate 4 Imaging camera 5 Arithmetic section

──────────────────────────────────────────────── ───

[Procedural amendment]

[Submission date] December 10, 1991

[Procedural amendment 2]

[Name of document to be amended] Specification

[Correction target item name] Full text

[Correction method] Change

[Correction details]

[Document name] Specification

[Name of invention] Position measuring device

[Scope of utility model registration request]

[Brief explanation of drawings]

[Figure 1] Drawing showing an embodiment of the present invention

[Figure 2] Plan view explaining the operation of the device of the present invention

[Figure 3] Light pattern diagram in the state shown in Figure 2

[Fig. 4] Plan view explaining the operation of the device of the present invention

[Figure 5] Light pattern diagram in the state shown in Figure 4

[Fig. 6] Plan view explaining the operation of the device of the present invention

[Figure 7] Light pattern diagram in the state shown in Figure 6

[Explanation of symbols] 1 Mobile object 2 Slit plate 3 Slit plate 4 Imaging camera 5 Arithmetic section

Claims (2)

[Scope of utility model registration request] Claim 1: A pair of slit plates in which a number of transparent slits of the same width are formed at equal intervals and arranged in parallel along the movement path of a moving body moving in a straight line, and a moving body moves via the pair of slit plates. 1. A position measuring device comprising: an imaging camera that images a light pattern emitted from a body; and a calculation unit that calculates the position of a moving body from a light pattern signal obtained by the imaging camera. 2. Claim 1, wherein the pair of slit plates are constructed by forming transparent slits on both sides of a transparent flat plate.
The position measuring device described.