JP2006071621A - Sensor for detecting moving body - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a sensor for detecting moving body with a small size and low cost, capable of detection of migration of an object in a specified direction in a space, and a signal which can be utilized for the decision of the existence of the object in the space can be output. <P>SOLUTION: The photodetectors PD1 to PD3, consisting of n pieces (n is an integer larger than 2) and a signal output circuit 14 which outputs a pulse signal according to a variation of an output signal of each of the photodetectors PD1 to PD3, are mounted on a semiconductor chip. The light-receiving surface of each photodetector faces the object moving space and are arranged on a line. When the object passes near the light-receiving surface in a forward direction, the light-receiving surfaces from the first to the n-th are shaded in the order. When the photoreceiving surface of the m-th (2≤m≤n) is shaded, the pulse signal begins to be output to the output terminal OUT. Then, a light is again incident on each light-receiving surface according to the passage of the object, the output of the pulse signal is stopped, when the light being to be incident on the light-receiving surface of the p-th (2≤p≤n). The pulse signal will not be output, when the object passes in the reverse direction. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a moving body detection sensor for determining the presence or absence of an object in a predetermined space and detecting its moving direction.

  As an example of a sensor capable of detecting the movement of an object in a specific direction, there is a fixed direction passage detection sensor described in Patent Document 1. This sensor has a light receiving element, and is connected to two light quantity detection circuits that detect a change in the quantity of light that can be generated when an object passes, and to each light quantity detection circuit. A pulse output circuit that outputs a signal, a direction discrimination circuit that compares and determines signals from each pulse output circuit, and supplies a signal only when movement of an object in one direction is detected, and a signal from the direction discrimination circuit The detection output circuit is configured to switch the voltage of a power supply line for supplying power to each circuit between a high level and a low level to generate a detection signal.

  As another example, there is a motion detection device described in Patent Document 2. This apparatus has a binary signal 1 based on the difference in image intensity at two locations near position A and a binary signal 2 based on the difference in image intensity at two locations near position B. And, based on the relationship between the signal 1 and the signal 2, at least one of the direction of motion and the speed of motion is obtained. And according to such a structure, since the direction and speed of a motion are detected based on the relationship of a binary signal, it is supposed that it is easy to integrate on a semiconductor.

  Further, as a sensor for determining the presence or absence of an object in a predetermined space, a light receiver such as a phototransistor having a light receiving surface arranged facing the space is provided, and the intensity of light incident on the light receiving surface is a threshold value Some use a photo interrupter that outputs a binary signal depending on whether it is above or below a threshold. In such a sensor, when the object passes through the space, the photo interrupter recovers from the time when the received light intensity falls below the threshold value due to the entry of the object (light shielding start time) to the time when the received light intensity recovers to the threshold value when the object leaves A pulse having a width corresponding to the time until the light incident start time) is output. The pulse width of this output signal varies not only with the moving speed of the object but also with the size of the object.

  In the sensor described in Patent Document 1, each circuit is configured by using elements such as a phototransistor, a resistor, a capacitor, and a comparator as shown in FIG. In such a configuration, it may be difficult to create a small sensor that can be used even in a state-of-the-art electronic device.

  On the other hand, the apparatus described in Patent Document 2 cannot determine the presence or absence of an object in space. The reason is as follows. As can be seen from the description in Example 1 of Patent Document 2 (particularly [0027]), the apparatus described in the document has the light-shielding start time at position B (or light-shielding start time at position A (or light-incidence start time)) (or A pulse having a width corresponding to the time until the light incident start time) is output. The width of this pulse is affected only by the moving speed of the object. Therefore, no matter how large an object passes, if the speed is the same, a pulse having the same width is output. On the other hand, in order to determine the presence / absence of an object in space, a signal capable of specifying both the light shielding start time and the light incident start time is required, such as the output signal of the photo interrupter described above. However, the device described in Patent Document 2 is not configured to output such a signal. Therefore, this apparatus cannot be used for determining the presence or absence of an object in space.

  Note that the presence or absence of an object in space cannot be determined using the sensor described in Patent Document 1. This is due to the fact that the sensor can actually output only a pulse of about 10 ms. With a pulse of this width, it is possible to execute processing that is about the count of passing objects, but it is not possible to determine whether the object still exists in space or has passed completely.

JP-A-3-84464 (Fig. 2) Japanese Patent No. 3546296 (page 3, lines 17-20, page 4, lines 2-13)

  The present invention has been made to solve the above-described problems, and an object of the present invention is to detect the movement of an object in a specific direction in a predetermined space and to detect a conventional photo interrupter. Similarly, it is an object to provide a small and low-cost moving body detection sensor that can output a signal that can be used to determine the presence or absence of an object in the space.

A moving body detection sensor according to a first aspect of the invention made to solve the above-described problem is a moving body detection sensor that detects movement of an object in a predetermined space in a predetermined direction.
N light receivers arranged along the predetermined direction and having light receiving surfaces facing the space (where n is an integer of 2 or more), and a pulse signal according to a change in the output signal of each light receiver A signal output circuit that outputs
The light receiver and the signal determination circuit are mounted on a semiconductor chip; and
The signal output circuit is
The change in the output signal of the light receiver from the first level to the second level is m-th (where 2 ≦ m ≦ n) from the first light receiver closest to the object entrance side to the object exit side. When the light receiving device sequentially occurs, the output of the pulse signal is started, and then the change from the second level to the first level of the output signal of the light receiving device is changed from the first light receiving device to p ( However, when the 2 ≦ p ≦ n) photoreceivers occur in order, the output of the pulse signal is terminated,
When the change in the output signal of the photoreceiver occurs in the order from the nth photoreceiver on the exit side to the first photoreceiver in the reverse order, the pulse signal is not output. ,
It is characterized by.

A moving body detection sensor according to the second invention made to solve the above-mentioned problems is a moving body detection sensor for detecting movement of an object in a predetermined space in a predetermined direction and the opposite direction thereof.
N light receivers arranged along the predetermined direction and having light receiving surfaces facing the space (where n is an integer of 2 or more), and a pulse signal according to a change in the output signal of each light receiver And a signal output circuit having first and second output terminals,
The light receiver and the signal determination circuit are mounted on a semiconductor chip; and
The signal output circuit is
The change in the output signal of the light receiver from the first level to the second level is m-th (where 2 ≦ m ≦ n) from the first light receiver closest to the object entrance side to the object exit side. When the light receiving device occurs in order, the output of the pulse signal is started at the first output terminal, and then the change from the second level to the first level of the output signal of the light receiving device is the first level. The output of the pulse signal to the first output terminal is terminated when the light receiving device sequentially occurs from the light receiving device to the p (where 2 ≦ p ≦ n) light receiving device.
When the change from the first level to the second level of the output signal of the photoreceiver occurs in the order from the nth photoreceiver on the outlet side to the first photoreceiver in the opposite order. In addition, the output of the pulse signal is started at the second output terminal, and then the change from the second level to the first level of the output signal of the photoreceiver changes from the nth photoreceiver to the first level. Configured to end the output of the pulse signal to the second output end when it occurs in order toward the light receiver,
It is characterized by.

Furthermore, the moving body detection sensor according to the third aspect of the present invention, which has been made to solve the above problem, is a moving body detection sensor that detects movement of an object in a predetermined space in a predetermined direction.
N light receivers (where n is an integer of 2 or more) arranged along the predetermined direction and each having a light receiving surface facing the space, and an output terminal according to a change in an output signal of each light receiver Equipped with a signal output circuit that outputs a pulse signal,
The light receiver and the signal determination circuit are mounted on a semiconductor chip; and
The signal output circuit is
The change in the output signal of the light receiver from the first level to the second level is m-th (where 2 ≦ m ≦ n) from the first light receiver closest to the object entrance side to the object exit side. When the light receiving device occurs in order, the output of the pulse signal is started at the first output terminal, and then the change from the second level to the first level of the output signal of the light receiving device is the first level. The output of the pulse signal to the first output terminal is terminated when the light receiving device sequentially occurs from the light receiving device to the p (where 2 ≦ p ≦ n) light receiving device.
When a change in the output signal of the photoreceiver occurs in the order from the nth photoreceiver on the outlet side to the first photoreceiver in the reverse order, a reset signal is given from the outside or corresponds to it. It is configured to fix the signal level of the output terminal until reset is executed,
It is characterized by.

  Any of the moving body detection sensors according to the first to third inventions outputs a first level signal when the light receiving intensity on the light receiving surface is equal to or higher than a predetermined threshold value, and when the received light intensity is lower than the threshold value, the second level signal is output. There are n light receivers for outputting signals (where n is an integer of 2 or more). These light receivers are arranged along the passing direction of the object, and the light receiving surface faces a space (hereinafter referred to as a detection space) through which the object passes.

  In this moving body detection sensor, when an object passes through the detection space, incident light on the light receiving surface of each light receiver is blocked by the object one after another. When the incident light is blocked, the received light intensity of the light receiver becomes less than the threshold value, and the output signal thereof changes from the first level to the second level. Such a change in the output signal occurs sequentially from the first light receiver to the nth light receiver as the object passes. When a change in the output signal of the m-th photoreceiver occurs, the signal output circuit starts outputting the pulse signal. m may be equal to n, but may be smaller than n as long as it is 2 or more.

  Further, after the change of the output signal as described above occurs, when the object passes completely near the light receiving surface of the light receiver, the light receiving intensity of the light receiver becomes equal to or higher than the threshold value, and the output signal is changed from the second level to the second level. Return to level 1. Such a return of the output signal occurs sequentially from the first light receiver to the nth light receiver as the object passes. When the output signal of the p-th photoreceiver is restored, the signal output circuit finishes outputting the pulse signal. p may be equal to m or n, but may be smaller than n as long as it is 2 or more. Such an operation is common to the moving body detection sensor according to the first to third inventions. On the other hand, the operation when the object passes through the detection space in the opposite direction is different between the moving body detection sensors according to the first to third inventions.

  In the moving body detection sensor according to the first invention, when the object passes through the detection space in the reverse direction, the change of the output signal of the light receiver is in reverse order (that is, the order from the nth light receiver toward the first light receiver). To occur. In this case, the signal output circuit does not output a pulse signal.

  In the moving body detection sensor according to the second aspect of the invention, the signal output circuit is a circuit similar to that for generating a pulse signal when the object passes through the detection space in a predetermined direction as described above, and the object moves in the reverse direction in the detection space. To generate a pulse signal even when it passes through (that is, the change in the output signal of the light receiver occurs in the reverse order). The pulse signal generated when the object passes through the detection space in the predetermined direction is output from the first output end, but the pulse signal generated when the object passes through the detection space in the reverse direction is the first pulse signal. It is output from a second output terminal different from the output terminal.

  In the moving body detection sensor according to the third aspect of the invention, when the signal output circuit detects that the change in the output signal of the light receiver has occurred in the reverse order when the object passes through the detection space in the reverse direction, the signal level at the output end is detected. Is fixed to logic 0 or 1. The state is maintained until a reset signal is given from the outside or a reset corresponding to the supply of the reset signal is executed, for example, the power is turned on again.

  As described above, the moving body detection sensor according to the first invention outputs a pulse signal only when an object passes through a predetermined space in a specific direction, and does not output a signal when the object passes in the opposite direction. . The moving body detection sensor according to the second aspect of the invention outputs a pulse signal to the first output terminal when an object passes through a predetermined space in a specific direction, and outputs a pulse signal when the object passes in the opposite direction. Output to another second output terminal. Furthermore, the moving body detection sensor according to the third aspect of the invention outputs a pulse signal to the output end when an object passes through a predetermined space in a specific direction, and outputs a signal at the output end when the object passes in the opposite direction. It will not be released until the level is fixed and reset. Therefore, such a sensor can be suitably used when it is desired to selectively detect the movement of an object in a specific direction.

  In the moving body detection sensor according to the first to third aspects of the invention, the width of the pulse output from the signal output circuit is such that incident light is blocked for all the first to m-th photoreceivers. This corresponds to the time from the point in time (light shielding start point) to the point in time at which light is incident again on all the first to pth light receivers (light incident start point). That is, since both the light blocking start time when the object arrives and the light incident start time when the object passes are specified, it is possible to determine the presence or absence of the object in the detection space based on the pulse signal. It is.

  The moving body detection sensor according to the first to third inventions does not output the pulse signal unless the output signals of m or p light receivers change / return in a predetermined order. Therefore, for example, even if the incident light to all the light receivers is blocked simultaneously or the light incidence to all the light receivers is restarted at the same time, no pulse signal is output. This means that the moving body detection sensor according to the first to third inventions has high resistance to disturbance light, and it can be detected that the movement of the object in a specific direction is abnormal.

  Moreover, since the moving body detection sensor according to the first to third inventions employs a configuration in which the light receiver and the signal output circuit are mounted on the semiconductor chip, the sensor can be reduced in size and cost. Further, a signal necessary for detecting the movement of an object in a specific direction and determining the presence / absence of an object in a predetermined space can be obtained with only one chip.

  In addition, according to the moving body detection sensor of the second invention, it is possible to detect that the object has moved in the direction opposite to the specific direction. For example, an eagle object that originally moves only in the specific direction moves against it. Can be detected. Moreover, since the movement of the object that reciprocates can be detected, it can be used for a wider range of applications than the moving body detection sensor according to the first invention.

  Further, according to the moving body detection sensor of the third invention, when the object moves in the direction opposite to the specific direction, the subsequent operation as a sensor is prohibited. When the object moves in the opposite direction, it can be prevented from responding to the next movement of the object in a specific direction.

[Example 1]
First, an example (Example 1) of a moving body detection sensor according to the first invention will be described with reference to the drawings. FIG. 1 is an external view showing a moving body detection sensor according to the first embodiment. The moving body detection sensor 1 of the first embodiment (hereinafter simply referred to as sensor 1) includes a semiconductor chip 12 having a light receiving region 10 in which three light receiving surfaces 10A to 10C are arranged in a line. A pulse is generated when an object passes on the semiconductor chip 12 in the direction from the light receiving surface 10A toward the light receiving surface 10C (hereinafter referred to as the forward direction and the opposite direction as the reverse direction). A signal output circuit 14 for outputting a signal is mounted.

  FIG. 2 is a logic circuit diagram showing a configuration example of the signal output circuit 14. In this example, three light receivers PD1 to PD3, three amplifiers AMP1 to AMP3, three comparators CMP1 to CMP3, two exclusive OR (XOR) gates XOR1, XOR2, and one NOR gate The NOR and the three T-type flip-flops FF1 to FF3 are connected as shown in FIG. The light receiving surfaces of the three light receivers PD1 to PD3 are the light receiving surfaces 10A to 10C in FIG. 1, and the normal rotation (Q) output of the flip-flop FF3 is connected to the output terminal (OUT) of the signal output circuit 14. It has become.

  FIG. 3 is a time chart showing various signals generated in the signal output circuit 14 and the output signal of the sensor 1 when the object passes in the forward direction in the vicinity of the front side of the light receiving surface, and FIG. FIG. 5 is a time chart showing the relationship between the position of the object relative to the light receiving surface and the output of the sensor 1 when passing in the forward direction in the forward direction. FIG. 5 shows the light receiving surface when the object passes in the reverse direction near the front of the light receiving surface. 6 is a time chart showing the relationship between the position of the object and the output of the sensor 1 with respect to.

  As shown in FIG. 4, when an object passes in the forward direction in the vicinity of the front of the light receiving region 10, incident light is blocked in order from the light receiving surface 10 </ b> A to the light receiving surface 10 </ b> C. When the incident light is blocked in a range of more than half of the light receiving region 10 (time t1 in FIG. 4), the output of the pulse signal is started (that is, the signal level of the output terminal OUT is changed from “0” to “ 1 ”). Thereafter, as the object moves, light again enters the light receiving surface 10A in order. When light is incident again in a range of more than half of the light receiving region 10 (time t2 in FIG. 4), the output of the pulse signal is stopped (that is, the signal level of the output terminal OUT is changed from “1”). Changes to "0").

  Conversely, as shown in FIG. 5, when the object passes in the reverse direction (that is, the direction from the light receiving surface 10C toward the light receiving surface 10A) in the vicinity of the front of each light receiving surface, no pulse signal is output and the output terminal OUT Is maintained at “0”. Further, no pulse signal is output even when light is incident on the light receiving surfaces 10A to 10C at the same time or is simultaneously shielded.

  The operation of the signal output circuit 14 of FIG. 2 will be described with reference to FIG. 3. Since the output signals of the three light receivers PD1 to PD3 sequentially become “1” as the object moves, “0” in the same order. "become. Therefore, the outputs of the two XOR gates XOR1 and XOR2 appear both at the start and end of passage of the object. It is detected by the flip-flops FF1, FF2 and the NOR gate that the outputs of XOR1 and XOR2 are generated in succession and in order, and the normal rotation (Q) output of the flip-flop FF2 which is the detection signal is passed through the flip-flop FF3. As a result, an output signal that becomes “1” when the object passes in the forward direction is obtained. On the other hand, when the object passes in the reverse direction, the output change order of XOR1 and XOR2 is different from that in the forward direction, so the forward (Q) output of the flip flip FF2 does not become “1”. No pulse signal is output from the output terminal.

  Looking at this timing in detail, the output of the pulse signal is started when the second light receiver PD2 is shielded from light, and then stopped when the light again enters the light receiver PD2. From this, the configuration of the first embodiment is such that the number n of light receivers is 3 and m and p are 2 in the first invention. Of course, n can be at least 2. In addition, m = p = n can be easily achieved by changing the circuit configuration. In that case, the output of the pulse signal is started from the output end when almost the entire light receiving area is shielded by the object, and the pulse is emitted when the object passes and the light hits almost the entire surface of the light receiving area. The signal ends.

  As described above, since the pulse signal of the sensor 1 is output only when the object passes in the forward direction, the moving direction of the object can be detected based on the signal. Further, the output pulse signal is output with a time width from the time when the incident light is blocked (light shielding start time) to the time when the light comes again (light entering start time). Therefore, the presence or absence of an object in the vicinity of the light receiving region 10 can be determined based on this signal.

[Example 2]
Next, an example (Example 2) of the moving body detection sensor according to the second invention will be described with reference to the drawings. Although the external appearance of the moving body detection sensor of the second embodiment is not shown, it is basically the same as that of the first embodiment shown in FIG. 1 and has four light receiving surfaces arranged in the light receiving region 10, that is, the light receiving surface. Only the point of 10A to 10D is different.

  FIG. 6 is a logic circuit diagram showing a configuration example of the signal output circuit 24 in the sensor of the second embodiment. FIG. 7 shows the signal output circuit 24 when an object passes in the forward and reverse directions near the front of the light receiving surface. It is a time chart which shows the various signals which generate | occur | produce inside, and the output signal of the sensor 1. FIG.

  The signal output circuit 24 includes four light receivers PD1 to PD4, four amplifiers AMP1 to AMP4, four comparators CMP1 to CMP4, two XOR gates XOR1, XOR2, one NOR gate NOR and 6 The T-type flip-flops FF1 to FF6 are connected as shown in FIG. 6, the normal (Q) output of the flip-flop FF3 is the first output terminal OUTA, and the normal (Q) output of the flip-flop FF6 is This is the second output terminal OUTB. Among these, the logic circuit except the flip-flops FF4 to FF6 has the same basic operation as that of the first embodiment although there is a difference that the number of light receivers, amplifiers, and comparators is increased from three to four. When the object passes in the forward direction, a pulse signal is output to the first output terminal OUTA, and when the object passes in the reverse direction, no pulse signal is output and maintains “0”.

  The configuration of the second embodiment is the reverse of the forward movement detection circuit composed of XOR gates XOR1, XOR2, NOR gate NOR, flip-flops FF1, FF2, and FF3, and flip-flops FF4, FF5, and FF6. It is characterized in that it includes a direction movement detection circuit. As apparent from FIG. 6, the backward movement detection circuit has the same circuit configuration as the three flip-flops FF1, FF2, and FF3 in the forward movement detection circuit, and the input pulses (C) of the flip-flops FF4 and FF5 are the same. Only the flip-flops FF1 and FF2 are replaced. As a result, the backward movement detection circuit operates in the reverse manner to the forward movement detection circuit, that is, when the object passes in the reverse direction, a pulse signal is output to the second output terminal OUTB, and the object passes in the forward direction. When this is done, "0" is maintained without outputting a pulse signal.

  Although the moving body detection sensor according to the first embodiment can detect that the object has passed in the forward direction, it cannot detect that the object has passed in the reverse direction, but the moving body according to the second embodiment can be detected. According to the detection sensor, it is possible to independently detect that the object has passed in the forward direction and that the object has passed in the reverse direction. Thereby, for example, when it is an abnormal situation that an object passes in the reverse direction, it is possible to detect the abnormality and take appropriate measures.

Example 3
Next, an example (Example 3) of the moving body detection sensor according to the third invention will be described with reference to the drawings. FIG. 8 is a logic circuit diagram showing a configuration example of the signal output circuit 34 in the sensor of the third embodiment. FIGS. 9 and 10 show signal output when an object passes in the forward and reverse directions in the vicinity of the front side of the light receiving surface. 3 is a time chart showing various signals generated inside a circuit 34 and output signals of the sensor 1. Note that the time chart of FIG. 10 can be considered to be temporally continuous with the time chart of FIG.

  The signal output circuit 34 includes four light receivers PD1 to PD4, four amplifiers AMP1 to AMP4, four comparators CMP1 to CMP4, two XOR gates XOR1, XOR2, one NOR gate NOR, The AND gates AND1, AND2, one OR gate OR, one NAND gate NAND, and five T-type flip-flops FF1 to FF5 are connected as shown in FIG. The output is the output terminal OUT. Further, a reset terminal RST for supplying a reset signal from the outside is provided.

  In the third embodiment, the operation of the forward movement detection circuit including the XOR gates XOR1 and XOR2, the NOR gate NOR, the flip-flops FF1, FF2, and FF3 is exactly the same as the forward movement detection circuit in the second embodiment. In the configuration of the third embodiment, in addition to the forward movement detection circuit, an abnormality (reverse movement) detection circuit including AND gates AND1, AND2, OR gate OR, NAND gate NAND, flip-flops FF4 and FF5 is provided. ing. As shown in FIG. 9, when the object moves in the forward direction, the normal rotation (Q) output of the flip-flop FF5 is maintained at “0” in the abnormality detection circuit. Therefore, the inversion (Q bar) output of the flip-flop FF3 is output to the output terminal OUT, whereby a pulse signal appears.

  On the other hand, when the object moves in the opposite direction, the forward rotation (Q) output of the flip-flop FF5 changes to “1” in the abnormality detection circuit, and “1” is maintained even after the object has passed. . Therefore, the signal level of the output terminal OUT is fixed to “1” by the NAND gate NAND. As shown in FIG. 10, the signal level of the output terminal OUT is set to “1” even if the object passes thereafter in the forward direction. The pulse signal as described above is not output while being fixed. Therefore, by monitoring the signal level of the output terminal OUT, it can be determined whether or not the object has passed in the reverse direction even once. To release this state, a pulse signal is supplied to the reset terminal RST. As a result, the flip-flops FF3 and FF5 are reset, so that the pulse signal can be output when the object passes in the forward direction as shown in FIG.

  As described above, according to the moving body detection sensor according to the third embodiment, once it is detected that the object has passed in the reverse direction, the output is fixed until the reset is performed and the object has passed in the forward direction. Can be made to not respond.

  As mentioned above, although one Example of the mobile body detection sensor which concerns on 1st thru | or 3rd invention was described, the said Example is only an example to the last, and various Example can also be considered within the mind and scope of this invention. It is done. For example, in the above embodiment, three or four light receivers are used. However, by appropriately changing the configuration of the signal output circuit, a sensor that outputs the above pulse signals using five or more light receivers. It is also possible to configure a sensor that outputs a pulse signal as described above using only two light receivers. That is, in the first to third inventions, n only needs to be an integer of 2 or more, and m and p need only be integers of 2 or more and n or less. The configuration of the signal output circuit is also an example, and it is natural that the logic circuit can be modified as appropriate in order to achieve the same function.

The external view which shows one Example of the mobile body detection sensor which concerns on 1st invention. FIG. 2 is a logic circuit diagram illustrating a configuration example of a signal output circuit of the moving object detection sensor illustrated in FIG. 1. The time chart which shows the various signals which generate | occur | produce inside the signal output circuit shown in FIG. 2, and the output signal of a sensor. The time chart which shows the relationship between the position of an object and the output of a sensor when an object passes the vicinity of the light-receiving surface in the forward direction. The time chart which shows the relationship between the position of an object and the output of a sensor when an object passes the vicinity of the light-receiving surface in the reverse direction. The logic circuit figure which shows the structural example of the signal output circuit of the mobile body detection sensor by one Example of 2nd invention. 7 is a time chart showing various signals generated in the signal output circuit shown in FIG. 6 and sensor output signals. The logic circuit figure which shows the structural example of the signal output circuit of the mobile body detection sensor by one Example of 3rd invention. 9 is a time chart showing various signals generated in the signal output circuit shown in FIG. 8 and sensor output signals. 9 is a time chart showing various signals generated in the signal output circuit shown in FIG. 8 and sensor output signals.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Moving body detection sensor 10 ... Light-receiving region 10A-10C ... Light-receiving surface 12 ... Semiconductor chip 14, 24, 34 ... Signal output circuit PD1-PD4 ... Light receiver AMP1-AMP4 ... Amplifier CMP1-CMP4 ... Comparator FF1-FF6 ... T-type flip-flops XOR1, XOR2 ... Exclusive OR gates AND1, AND2 ... AND gate NAND ... NAND gate NOR ... NOR gate OR ... OR gates OUT, OUTA, OUTB ... Output terminal RST ... Reset terminal

Claims (3)

In a moving body detection sensor that detects movement of an object in a predetermined space in a predetermined direction,
N light receivers arranged along the predetermined direction and having light receiving surfaces facing the space (where n is an integer of 2 or more), and a pulse signal according to a change in the output signal of each light receiver A signal output circuit that outputs
The light receiver and the signal determination circuit are mounted on a semiconductor chip; and
The signal output circuit is
The change in the output signal of the light receiver from the first level to the second level is m-th (where 2 ≦ m ≦ n) from the first light receiver closest to the object entrance side to the object exit side. When the light receiving device sequentially occurs, the output of the pulse signal is started, and then the change from the second level to the first level of the output signal of the light receiving device is changed from the first light receiving device to p ( However, when the 2 ≦ p ≦ n) photoreceivers occur in order, the output of the pulse signal is terminated,
When the change in the output signal of the photoreceiver occurs in the order from the nth photoreceiver on the exit side to the first photoreceiver in the reverse order, the pulse signal is not output. ,
A moving body detection sensor. In a moving body detection sensor for detecting movement of an object in a predetermined space in a predetermined direction and the opposite direction thereof,
N light receivers arranged along the predetermined direction and having light receiving surfaces facing the space (where n is an integer of 2 or more), and a pulse signal according to a change in the output signal of each light receiver And a signal output circuit having first and second output terminals,
The light receiver and the signal determination circuit are mounted on a semiconductor chip; and
The signal output circuit is
The change in the output signal of the light receiver from the first level to the second level is m-th (where 2 ≦ m ≦ n) from the first light receiver closest to the object entrance side to the object exit side. When the light receiving device occurs in order, the output of the pulse signal is started at the first output terminal, and then the change from the second level to the first level of the output signal of the light receiving device is the first level. The output of the pulse signal to the first output terminal is terminated when the light receiving device sequentially occurs from the light receiving device to the p (where 2 ≦ p ≦ n) light receiving device.
When the change from the first level to the second level of the output signal of the photoreceiver occurs in the order from the nth photoreceiver on the outlet side to the first photoreceiver in the opposite order. In addition, the output of the pulse signal is started at the second output terminal, and then the change from the second level to the first level of the output signal of the photoreceiver changes from the nth photoreceiver to the first level. Configured to end the output of the pulse signal to the second output end when it occurs in order toward the light receiver,
A moving body detection sensor. In a moving body detection sensor that detects movement of an object in a predetermined space in a predetermined direction,
N light receivers (where n is an integer of 2 or more) arranged along the predetermined direction and each having a light receiving surface facing the space, and an output terminal according to a change in an output signal of each light receiver Equipped with a signal output circuit that outputs a pulse signal,
The light receiver and the signal determination circuit are mounted on a semiconductor chip; and
The signal output circuit is
The change in the output signal of the light receiver from the first level to the second level is m-th (where 2 ≦ m ≦ n) from the first light receiver closest to the object entrance side to the object exit side. When the light receiving device occurs in order, the output of the pulse signal is started at the first output terminal, and then the change from the second level to the first level of the output signal of the light receiving device is the first level. The output of the pulse signal to the first output terminal is terminated when the light receiving device sequentially occurs from the light receiving device to the p (where 2 ≦ p ≦ n) light receiving device.
When a change in the output signal of the photoreceiver occurs in the order from the nth photoreceiver on the outlet side to the first photoreceiver in the reverse order, a reset signal is given from the outside or corresponds to it. It is configured to fix the signal level of the output terminal until reset is executed,
A moving body detection sensor.

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