JPS60158364A - Detection of moving direction - Google Patents

Abstract

PURPOSE:To detect the moving direction of an object such as human body with a single detection element by arranging a plurality of reflectors and transmission filters to detect increase or decrease in the reflection factor or transmission factor. CONSTITUTION:For example, an infrared sensor detection element 1 and reflectors 2a and 2b are arranged. When a human body 3 is moving in the direction X, the infrared sensor 1 initially detects radiate infrared rays reflected with the reflector 2a and then, radiate infrared rays reflected with the reflector 2b. As shown by the drawing (a), the detection pulse is larger in the latter than that in the former. When the human body 3 moves in the direction of Y, the detection pulse is similar as shown by the drawing (b). When a transmission filter is used in place of the reflector, detection can be done in the same way. Thus, one detection element is enough thereby eliminating the need for using a plurality of detection elements with strictly identical characteristics while facilitating the direction of an object moving without restriction in the manufacture.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention relates to a moving direction detection method capable of detecting the moving direction of an object such as a human body using a single detection element. , two or more detection elements are used, and the moving direction of the object is detected from the temporal sequential relationship of detection pulses emitted by each detection element. by the way,
When using two or more detection elements in this way, it is necessary that the characteristics of each detection element be the same, and therefore special attention must be paid to the manufacturing process so that detection elements with uniform characteristics can be produced. In addition, there is a manufacturing disadvantage in that a separate sorting operation is required to select elements with the same characteristics. <Purpose and structure of the invention> Therefore, the present invention aims to eliminate the above manufacturing disadvantages. , provides a novel moving direction detection method that can determine the moving direction of an object using a single detection element.

In order to achieve this object, the movement direction detection method according to the present invention includes a plurality of reflection mirrors or transmission filters such that their reflectance or transmittance monotonically increases or monotonically decreases along the movement direction of the object. The gist is that the amount of light incident on the detection element is sequentially increased or decreased depending on the direction of movement of the object, thereby making it possible to detect the direction of movement of the object with a single detection element.

Hereinafter, the method of the present invention will be explained based on examples shown in the drawings.

<Example 1> In FIG. 1, (1) is an infrared sensor as a detection element, and (2a) and (2b) are two reflecting mirrors arranged along the moving direction of an object. Double reflective mirror (2a
) and (2b) have different reflectances. In order to make the reflectance different, the reflecting surface of one of the reflecting mirrors may be formed into a rough surface or the size of the reflecting surface may be changed. The latter approach is particularly easy and convenient to implement.

Now, assume that the reflectance of the reflecting mirrors (2a) and (2b) is set to increase along the moving direction of the object. That is, assume that the reflectance of one reflecting mirror (1a) is Pa and that of the other is Pb, and it is set to Pa(pb.In this state,
When an object (3) such as a human body moves in the direction of arrow f For detection, the detection pulses exhibit changes such that the later ones become larger than the first ones, as shown in FIG. 2(a). On the other hand, on the other hand, the object (3
) moves in the direction of arrow Y, the infrared sensor (1) first receives the radiated infrared rays reflected by the reflecting mirror (2b).
Subsequently, the radiant infrared rays reflected by the reflection mirror (2a) enter, so that the detection pulses exhibit a change in which the later ones are smaller than the first ones, as shown in FIG. Therefore, by comparing the magnitudes of pulses emitted before and after the time from the infrared sensor (1), the moving direction of the object can be detected.

FIG. 8 shows an electric circuit that processes detection pulses to determine the moving direction of an object. In the figure, (41 is an amplifier, (5) is a delay device that delays the detection pulse until the next detection pulse is emitted, for example, a shift register is used. (6) is a comparator, and (6) is an infrared sensor (1). Compare the magnitude of the detection pulse emitted from the curver and the detection pulse emitted from the delay device (5).If the curver's pulse is larger, the object moves in the X direction, and the latter pulse is larger. If it is large, it can be determined that the object is moving in the Y direction.(7) means that the object is moving in the
When the object is moving in the X direction, a counter is activated to count detection pulses based on the output of the comparator (6), and by dividing the count by 2, the number of objects that have moved in the X direction can be calculated. (8) is a counter that operates to count detection pulses based on the output of comparator (6) when the object is moving in the Y direction, and by dividing the count content of the counter by 2, the object moves in the Y direction. The number of objects can be calculated.

In the above embodiment, two reflecting mirrors are used, but as shown in FIG. 4, eight or more reflecting mirrors may be used.

In that case each reflective mirror (2a).

(2b), (2c) − reflectance Pa, Pb,
Pc ”・monotonically increases along the moving direction of the object (Pa(
Pb (Pc...) or monotonically decreasing (Pa>Pb>P
c>...). In addition, each reflecting mirror (2a), (2b), (2c)...
2B), (2b)... need to be set.

In this way, the reflecting mirrors (2a), (2b), (2c)
When a plurality of . Therefore, the moving direction of the object can be detected depending on whether the detection pulses sequentially increase or decrease. The electric circuit shown in FIG. 8 can be used as is for processing the detection pulses and determining the moving direction of the object. However, to calculate the number of objects, use the counter [71, +81
<Example 2> Figure 6 shows an example in which the infrared rays radiated from an object are incident on the infrared sensor (1) through a transmission filter. filter (10a),
(10b) are provided along the moving direction of the object. Since the two transmission filters (10a) and (10b) have different transmittances, the detection pulse of the infrared sensor (11) changes as shown in FIG. 2 (a) or (b) depending on the moving direction of the object. Therefore, the moving direction of the object can be detected from such a change in the detection pulse.The electric circuit shown in FIG. 8 can be used as it is for detecting the moving direction.

In the case of a transmission filter, as in the case of a reflection mirror, 8
It is also possible to use more than one transmission filter.

FIG. 7 shows an example using such a large number of transmission filters. In the figure, (10a) and (10b).

(IOC)... are transmission filters, and the transmittance can be adjusted by slits 011...K. The detection pulse of the infrared sensor (1) in this configuration changes as shown in Figure 5 (a) or (b), and the electric circuit for determining the moving direction of the object from the detection pulse is the one shown in Figure 8. Can be used.

<Effects of the Invention> Since the moving direction detection method according to the present invention is as described above, it has the following effects. That is, a plurality of reflection mirrors or transmission filters with different reflectances or transmittances are arranged in a fixed relationship so that the amount of light incident on the detection element increases or decreases depending on the moving direction of the object, and the detection pulse of the detection element is Since the moving direction of the object is detected depending on whether the change in is in the increasing direction or decreasing direction, the effect is that the moving direction of the object can be detected with a single detection element.

Since one detection element is sufficient, there is no restriction that the detection elements must have the same characteristics.
Therefore, in manufacturing the detection element, there is an additional effect that strict conditions for film peeling and screening work are no longer necessary.

[Brief explanation of drawings]

Figure 1 is a diagram showing the configuration for carrying out the method of the present invention, Figure 2 (
(a) and (b) are diagrams showing changes in detection pulses when an object moves in the configuration shown in Figure 1; Figure 8 is an electrical circuit diagram for processing detection pulses to determine the moving direction of the object; 4 is a diagram showing another configuration for implementing the method of the present invention,
Figures 5(a) and 7(b) are diagrams showing changes in detection pulses when an object moves in the configuration of Figure 4, and Figures 6 and 7
The figures are diagrams showing still other configurations for implementing the method of the present invention. li+ =・-detection element, (2a), (2b), (2
c)...Reflection mirror, +31-...Object, (10a)
, (10b), (10c) - transmission filter. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 (A) (B) Figure 6 Figure 7

Claims (1)

[Claims] A plurality of reflection mirrors or transmission filters are provided so that their reflectance or transmittance monotonically increases or decreases along the moving direction of the object, so that the amount of light incident on the detection element increases or decreases depending on the moving direction of the object. 1. A moving direction detection method characterized in that the moving direction of an object can be detected by a single detection element.