JPH087200A - Detecting method for passage of movable object - Google Patents

Abstract

PURPOSE:To provide the passing detection method of a movable object for surely judging and discriminating a passing direction. CONSTITUTION:A remotely readable identification card 2 is attached to the respective movable objects 1 and the read means 3 of the identification card 2 is installed at the prescribed position of the path 5 of the movable objects 1. The prescribed position is provided with the light sources 8a and 8b of two light beams 7a and 7b crossing with the path 5 with an interval in a passing direction sufficiently shorter than the width in the passing direction of the movable object 1 and a pair of photoelectric type switches 9a and 9b for respectively detecting the light beams 7a and 7b. At the time of initial light beam detection by either one of the photoelectric switches 9a and 9b after both photoelectric switches 9a and 9b simultaneously detect the interruption of the light beams, the passing direction of the movable object 1 is judged, the identification card 2 of the movable object 1 is read by the read means 3 at the time of judging the passing direction and the movable object 1 is discriminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for detecting passage of a moving body, and more particularly to a moving body for detecting passage of a predetermined position in a controlled area with respect to a moving body moving in a controlled area such as a work site. Regarding a passage detection method.

[0002]

2. Description of the Related Art In order to manage the location of a moving body such as a person or a vehicle moving in a controlled area such as a construction site, there has been proposed a location-based location management method using a distance readable identification card. This area-by-area location management method divides the management area into a plurality of areas, installs a separately readable identification card on each moving body entering and leaving the management area, and installs an identification card reading means for movement between areas. The location area of each moving body is managed by restricting the moving body passing through each entrance and exit to the specified opening and closing. An example of the remote reading method is an electromagnetic induction type non-contact type data carrier system. In this case, an identification signal is transmitted to an identification card by electromagnetic induction based on a radio wave from the reading means, and the identification signal is read by the reading means. The non-contact data carrier system of the electromagnetic induction type has a weak directivity and is characterized in that the change of the transmission distance is small even if the relative direction of the identification card and the reading means changes.

A method of detecting passage of a moving body by an electromagnetic induction method at a doorway will be briefly described with reference to FIG. Although the illustrated example shows the case where the moving body 1 is a person, the passing can be similarly detected when the moving body 1 is a vehicle or the like. In order to manage the location of each area, it is indispensable not only to identify the moving body 1 at each entrance but also to detect the passing direction of the moving body 1. In the illustrated example, a pair of reading means 3 is arranged on both sides of the entrance passage 5, and a pair of photoelectric detection devices 15 are provided in front of and behind the reading means 3 when viewed from the entrance / exit direction. Each photoelectric detection device 15 has a light source 8 of a light beam that intersects the passage 5 and a photoelectric switch 9 for detecting the light beam, and photoelectrically reflects a reflected light beam from a reflection plate 10 facing the light source 8 through the passage 5. This is detected by the formula switch 9. For example, when the moving body 1 having the identification card 2 attached to the helmet 11 passes through the passage 5 of the entrance / exit, the light ray detection by each photoelectric switch 9 is sequentially interrupted, and the light ray interruption detection by the pair of photoelectric switches 9 (hereinafter , The light ray may not be detected), the passing direction of the moving body 1 can be determined. The movement between the areas of each moving body 1 is detected from the passing direction of the moving body 1 and the content of the identification card 2 by the reading means 3. Reference numeral 6 in the drawing denotes a readable area of the identification card 2 formed by the pair of reading means 3.

[0004]

However, the method of determining the passing direction of the moving body 1 based on the order of non-detection of light rays by the pair of photoelectric detection devices 15 is the positional relationship between the reading means 3 and the photoelectric detection devices 15. There is a difficult problem. For example, when the distance between the pair of photoelectric detection devices 15 is wide, two or more moving bodies 1 may enter between them, or when the moving body 1 enters between the pair of photoelectric detection devices 15 and returns without passing through. There is a problem that is difficult to judge.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a moving body passage detecting method for surely detecting the passage of each moving body.

[0006]

SUMMARY OF THE INVENTION The inventor of the present invention determines a passing direction of a moving body by judging the passing direction of a moving body by detecting the first light beam of one photoelectric switch after simultaneous non-detection of the light beam by a pair of photoelectric switches. It was noted that the above problems that occur when the judgment is made from the order of non-detection of light rays of the photoelectric detection device can be solved.

Referring to the embodiment of FIG. 1, in the method for detecting passage of a moving body according to the present invention, a distance-readable identification card 2 attached to each moving body 1 is provided at a predetermined position of a passage 5 of the moving body 1. In the method for detecting passage of the moving body 1 of the type in which the reading means 3 of the identification card 2 reads, a pair of light rays intersecting the passage 5 at the predetermined position with a passing direction interval sufficiently narrower than the passing width of the moving body 1 itself. Light sources 8a and 8b emitting 7a and 7b and a pair of photoelectric switches 9a and 9b for detecting light rays 7a and 7b, respectively, are provided, and both photoelectric switches 9a and 9b are one photoelectric switch 9a after no light detection. Or
The passing direction of the moving body 1 is determined when the first light beam is detected by 9b, and the identification card 2 of the moving body 1 is read by the reading means 3 when the passing direction is determined.

Preferably, the central portion of the reading means 3 is made to face the portion of the passage 5 between the pair of light rays 7a and 7b, and the central reading portion 4b is provided at the central portion thereof so that the moving body 1 in the passage 5 advances. Adjacent reading units 4a and 4c are provided in front of and behind the central reading unit 4b along the direction, and the reading unit 3 is used when determining the passing direction.
The moving body 1 by the adjacent reading unit 4a or 4c on the front side in the passage direction of
The identification card 2 of is read.

[0009]

The operation of the present invention will be described with reference to the embodiment of FIG. 1 when the moving body 1 is a person. However, the present invention can also be applied to a moving body 1 other than a person. The identification card 2 of the present invention may be, for example, an electromagnetic induction type card that emits an identification signal that can be read by the reading means 3 by electromagnetic induction based on a radio wave from the reading means 3. In the illustrated example, the reading means 3 is arranged above the moving body 1 passing therethrough so as to face the passage 5, but the reading means 3 is arranged so as to face both sides of the passage 5 as shown in FIG. Other arrangements such as passing through the area 6 are possible. A pair of light sources 8a, which emit light rays 7a and 7b, are provided in the central portion of the reading area 6 of the reading means 3 when viewed from the traveling direction of the moving body 1.
8b and a pair of photoelectric switches 9a and 9b for detecting the respective light rays 7a and 7b are provided. The distance between the light beams 7a and 7b is made sufficiently shorter than the width in the moving direction of the moving body 1 itself, that is, the length from the front end to the rear end in the moving direction of the moving body 1, and both photoelectric switches 9a and
The light detection by 9b can be blocked by the moving body 1 at the same time. The illustrated example is a pair of photoelectric detection devices that detect reflected light rays 7a and 7b from the reflection plate 10 with photoelectric switches 9a and 9b.
15a and 15b are shown. However, the light sources 7a and 7b and the photoelectric switches 8a and 8b used in the present invention are not limited to the photoelectric detection devices 15a and 15b of the illustrated example using the reflector 10.

FIG. 2A is a side view of the reading means 3 and the passage 5 provided with a pair of photoelectric switches 9a and 9b.
FIGS. 2B to 2F show changes with time in the light ray detection operation by the pair of photoelectric switches 9a and 9b as the moving body 1 passes.
In the figure, the light non-detection operation by the photoelectric switch is represented by the symbol ON, and the light detection operation by the symbol OFF. When the moving body 1 passes from the photoelectric switch 9a side to the 9b side without returning backward, the pair of photoelectric switches 9a and 9b are both turned off, after the state of FIG. 2 (B), as shown in FIG. 2 (C). First, the photoelectric switch 9a is turned on,
Next, the photoelectric switches 9a and 9b are simultaneously turned on (FIG. 2D).
It becomes the state of. In the present invention, after one of the photoelectric switches 9a or 9b is turned off after the state of FIG. 2 (D), the passing direction of the moving body 1 is determined from ON / OFF of each photoelectric switch 9a, 9b. . For example, when only one photoelectric switch 9a is turned off, at the time of FIG. 2 (E), the photoelectric switch that is turned off
It is determined that the light has passed from the 9a side to the ON photoelectric switch 9b side.

The interval between the pair of light rays 7a and 7b can be widened to the extent that the state of FIG. The state of FIG. 2E can be narrowed to the extent that it can be detected. For example, when the moving body 1 is a person, two rays
The distance between 7a and 7b can be about 3 cm.

FIG. 3 shows the change over time in the light beam detecting operation of the photoelectric switches 9a and 9b when the moving body 1 returns in the course of passing. 3 (A) to 3 (C) correspond to FIGS. 2 (A), 2 (C), and 2 (D), respectively, and in FIG. Expressed by the symbol OFF. According to the present invention, when the moving body 1 goes back from the state of FIG. 3C in which the pair of photoelectric switches 9a and 9b are not detecting the light rays at the same time, only one photoelectric switch 9b is turned off.
At the time of (D), it can be determined that the moving body 1 has passed from the photoelectric switch 9b side to the 9a side. When the moving body 1 returns from the state of FIG. 3 (B) in which only one photoelectric switch 9a is turned on, simultaneous light ray non-detection by the pair of photoelectric switches 9a and 9b does not occur, so the passing direction is determined. Although not obtained, since ON and OFF are detected only by one photoelectric switch 9a, it is possible to easily detect the backward movement of the moving body 1.

As described above, according to the present invention, since the moving direction of the moving body is determined when one photoelectric switch is turned off after the pair of photoelectric switches are simultaneously turned on, the pair of photoelectric switches are turned on. It is possible to solve the problem in the conventional technique of determining the passing direction from the order of. Further, when the identification card 2 is read by the reading means 3 at the time of determining the passing direction, the time difference between the determination of the passing direction and the reading of the identification card 2 can be eliminated, and the passage detection for each moving body 1 can be reliably performed. You can

Therefore, the object of the present invention is to provide a "moving body passage detecting method for surely detecting passage of each moving body".

Preferably, as shown in FIG. 1 (B), the reading means 3 is provided with a central reading section 4b and adjacent reading sections 4a and 4c along the passage direction of the moving body 1 so that the passage direction front side when the passage direction is judged. The identification card 2 of the moving body 1 is read by the adjacent reading section, in this case 4c. Other moving body 1a following moving body 1
Even when (not shown) enters the reading area 6, the succeeding moving body 1a is not directly under the adjacent reading unit 4c, and the adjacent reading unit 4c cannot read the identification card 2 of the succeeding moving unit 1. Since it is not present, the front and rear moving bodies 1 and 1a can be identified.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 4 shows a central reading section as shown in FIG.
An example of a flow chart of passage detection by the reading means 3 provided with 4b and the adjacent reading portions 4a and 4c is shown. Each reading unit 4a, 4b, 4c independently reads the identification card 2 immediately below.
Steps 401 to 404a indicate the reading operation by the adjacent reading units 4a and 4c, and indicate that the reading by the adjacent reading units 4a and 4c is repeated until the pair of photoelectric switches 9a and 9b do not detect light rays at the same time. Identification card 2 in step 402
Is read, and if read, step 40
At 3, the contents of the identification card 2 are stored in the pre-passage reading memory 13. The pre-passage reading memory 13 can be provided corresponding to each of the adjacent reading units 4a and 4c, as shown in FIG. In step 404 it is determined whether or not the light ray is detected by the photoelectric switch 9a or 9b, and if any light ray is being detected, the process returns to step 401. The occurrence of simultaneous non-detection of light rays by the switches 9a and 9b is determined. When the simultaneous non-detection of light rays occurs, it is determined that the moving body 1 starts to pass, and the process proceeds to step 405.

Steps 405 to 408 indicate that the reading by the central reading unit 4b is repeated during the passage of the moving body 1. In step 406, it is determined whether or not the identification card 2 has been read. If yes, the content of the identification card 2 is stored in the reading memory 14 during passage (see FIG. 1A) in step 407. Completion of interruption detection by one of the photoelectric switches 9b or 9a, that is, light ray detection is determined in step 408, and the reading operation is repeated until light ray detection (step 405), and the moving body 1 passes through in step 409 when light ray is detected. Determine the orientation.

After determining the passing direction of the moving body 1, step 410
Then, the identification card 2 is read by the adjacent reading section 4c on the front side in the passage direction. In step 411, the presence or absence of reading is determined, and if the reading is present, the moving body 1 is identified from the read content (step 412). If the identification card 2 cannot be read due to the passing speed of the moving body 1 or the like, step
Proceeding to 413 to 414, the moving body 1 is identified from the contents stored in the reading memory 14 during passage (step 414). Further, if there is no stored data in the reading memory 14 during passing, the process proceeds from step 413 to steps 415 to 416, and the moving body 1 is read from the contents stored in the reading memory 13 before passing corresponding to the adjacent reading section 4a on the backward side in the passing direction. Are identified (step 416).
If there is no stored data in the pre-passage read memory 13, it is determined that the moving body 1 to which the identification card 2 is not attached has passed (step 417). After the passing mobile body 1 is identified, the reading memory 13 before passing and the reading memory 14 during passing
The content of is deleted and the process returns to step 401 to prepare for the next passage detection of the moving body 1.

Even when the reading unit 3 is not provided with the central reading unit 4b or the adjacent reading units 4a and 4c, the passage detection using the reading memory 14 during passage can be performed. That is, the contents of the identification card 2 read by the reading means 3 are stored in the reading memory 14 during passage after the pair of photoelectric switches 9a and 9b do not detect the simultaneous rays and before the one of the photoelectric switches 9a and 9b detects the rays. In this way, even if the identification card 2 cannot be read when determining the passing direction, each moving body 1 can be identified using the contents stored in the reading memory 14 during passage.

[0020]

As described in detail above, the method for detecting passage of a moving body according to the present invention comprises two light beams that intersect a passage with a passing direction interval sufficiently narrower than the passing direction width of the moving body. Are detected by a pair of photoelectric switches, respectively, and the passing direction of the moving body is determined at the time of first light detection by one photoelectric switch after a pair of photoelectric switches are not simultaneously detected. Play.

(1) Even if the moving body reverts while it is passing, it can be easily determined that the reversal has occurred. (2) Since the time difference between the determination of the passing direction and the reading of the identification card can be eliminated, it is possible to reliably perform the passage detection for each moving body. (3) By providing the reading means with a plurality of reading units along the passage direction, even when a plurality of moving bodies enter the reading area, each moving body is moved in the same manner as when a single moving body passes through. Can be identified and the direction of passage can be determined.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention.

FIG. 2 is an explanatory diagram of moving body passage detection according to the present invention.

FIG. 3 is an explanatory diagram of passage detection in the case where the moving body returns in a backward direction.

FIG. 4 is an example of a flow chart of passage detection of the present invention.

FIG. 5 is an explanatory diagram of a conventional passage detection method.

[Explanation of symbols] 1 moving body 2 identification card 3 reading means 4a, 4c adjacent reading section 4b central reading section 5 passage 6 reading area 7,7a, 7b light beam 8,8a, 8b light source 9,9a, 9b photoelectric switch 10 Reflector 11 Helmet 12 Controller 13 Pre-passage read memory 14 Passage read memory 15 Photoelectric detector.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Reference number within the agency FI Technical indication location G08G 1/04 A // G08G 1/01 F (72) Inventor Suzuki Keiji Minato-ku, Tokyo Akasaka 1-2-7 Kashima Construction Co., Ltd.

Claims (5)

[Claims] 1. A method for detecting the passage of a moving body, wherein a separately readable identification card attached to each moving body is read by means for reading the identification card provided at a predetermined position in a passage of the moving body. A light source that emits a pair of light rays that intersect the passage at a distance in the passage direction that is sufficiently narrower than the width in the passage direction of the moving body, and a pair of photoelectric switches that detect the rays, respectively. A moving body that determines the passing direction of the moving body at the time of first detecting the light beam by one of the photoelectric switches after simultaneous non-detection of the light beam, and reads the identification card of the moving body by the reading means at the time of determining the passing direction. Passage detection method. 2. The latest identification card read by the reading means before the first detection of a light beam by one photoelectric switch after the simultaneous non-detection of light beams by both photoelectric switches in the passage detection method according to claim 1. Is stored in the reading memory during passage, and when the identification card cannot be read during the passage direction determination, the passage of the moving body is detected by the contents stored in the reading memory during passage and the passage direction. Detection method for moving objects. 3. The passage detecting method according to claim 1, wherein a central portion of the reading means faces a portion of the passage sandwiched by the pair of light rays, and a central reading portion is provided at the central portion of the passage. Adjacent reading units are provided in front of and behind the central reading unit along the traveling direction of the moving body, and the identification card of the moving body is read by the adjacent reading unit on the front side in the passing direction of the reading unit when the passing direction is determined. Method of detecting passage of a moving body. 4. The latest method of reading by the central reading section of the reading means in the passage detecting method according to claim 3, before the first light beam detection by one photoelectric switch after the non-detection of the light beams by both the photoelectric switches simultaneously. The content of the identification card is stored in the reading memory during passage, and if the identification card cannot be read during the passage direction determination, the passage of the moving body according to the content stored in the reading memory during passage and the passage direction. A method for detecting the passage of a moving body by detecting the. 5. The passage detecting method according to claim 4, wherein the latest contents of the identification card read by the adjacent reading section of the reading means before the non-detection of the light beams of the both photoelectric switches simultaneously are read before passing. In the case where the identification card cannot be read at the time of determining the passage direction and there is no content stored in the reading memory during passage, the data is read by the adjacent reading unit on the rear side in the passage direction and stored in the reading memory before passage. A method for detecting passage of a moving body, which detects the passage of the moving body based on the stored contents and the passing direction.