JP2561714Y2 - Obstacle detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an obstacle detection device, and is particularly provided in a moving unit such as a shutter curtain and transmits a signal when detecting a battery and an obstacle. Obstacle detection device provided with a device.

[Conventional technology]

2. Description of the Related Art Conventionally, an obstacle detection device has been used to detect an object (obstacle) that obstructs or prevents movement of a moving unit of an apparatus and stop the movement of the moving unit or cause the moving unit to perform an avoidance movement or the like. Have been. The obstacle detection device includes a detector that detects an obstacle, a transmitter that outputs an obstacle detection signal, and a battery that supplies power to the transmitter, and is installed in a moving unit of the device. When an obstacle is detected by the detector, an obstacle detection signal is output from the transmitter, and the obstacle detection signal is received by a receiver installed on a fixed part of the device, and the moving part is stopped. It is.

[Problems to be solved by the invention]

However, in the conventional obstacle detection device, a standby current is always supplied to the transmitter so that a signal can be immediately output when an obstacle is detected, and a battery is used as a power source. There is a problem that an appropriate operation cannot be performed when an object is detected.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an obstacle detection device capable of significantly extending the battery life.

[Means for solving the problem]

In order to achieve the above object, a first aspect of the present invention is an obstacle detection device provided in a moving unit and including a battery and a transmitter that outputs a predetermined signal. , One end is connected to the battery,
A connector that is closed to allow power to be supplied to the transmitter until a first predetermined time has elapsed from when the start of movement of the moving unit is detected by the detector; The other end is connected, the other end is connected to the transmitter,
Power supply control means for starting power supply to the transmitter when the moving unit comes into contact with an obstacle, and stopping the power supply after a lapse of a second predetermined time from the start of the power supply. It is characterized by.

Further, the second invention is an obstacle detection device provided in the moving unit and having a battery and a transmitter for outputting a predetermined signal, wherein the detector detects the start of movement of the moving unit, and one end is connected to the battery. A connection unit that is connected and is in a closed state to enable supply of power to a transmitter until a first predetermined time has elapsed from when the movement start of the movement unit is detected by the detector; A contact that closes only when in contact with an obstacle, a capacitor connected in series with the contact, a first resistor connected in series with the capacitor, and a collector whose emitter is connected to the other end of the connector. A first transistor connected to the transmitter and having a base connected to the first resistor; a second resistor connected between the emitter and the base of the first transistor; and the capacitor A diode provided between the contact and having an anode connected to the capacitor and a cathode connected to the contact; a collector connected between the first resistor and the capacitor; and an emitter connected to the capacitor and the diode. And a third resistor connected between the collector and the base of the second transistor, the second transistor having a base connected between the diode and the contact, and a base connected between the diode and the contact. And a power supply control circuit configured to include the power supply control circuit.

[Action]

In the first invention, the connector and the power supply control means are connected in series in this order between the battery and the transmitter. In the first invention, when the moving unit is not moving, the connector is open, and the battery is completely disconnected from other components (power supply control means and transmitter).

When the start of movement of the moving unit is detected by the detector, the connector is closed until a first predetermined time has elapsed from the detection time, and the transmitter waits from the battery via the connector and the power supply control means. By supplying a current, power (power for signal output) can be supplied to the transmitter. Then, when the moving unit comes into contact with the obstacle, power supply to the transmitter is started by the power supply control unit.
When power is supplied to the transmitter, a predetermined signal is output.

Further, after a lapse of a second predetermined time from the start of the power supply, the power supply control means stops the power supply to the transmitter.

When the moving unit comes into contact with the obstacle in this manner, power is supplied from the battery to the transmitter. However, the power supply is stopped after a lapse of the second predetermined time from the start, so that the battery power is wasted. Power consumption can be prevented, and the life of the battery can be significantly extended.

Further, after a lapse of a first predetermined time from the start of movement of the moving unit (for example, after a lapse of time required for the moving unit to move from the movement start position to the movement end position), the connector is in an open state, The battery is completely disconnected from other components. That is, at a time when there is no need to supply power, the battery and the other components are completely shut off, and the standby current does not flow, so that the power consumption of the battery can be further reduced.

In the second invention, when the start of movement of the moving unit is detected by the detector, the connector is closed until a first predetermined time has elapsed from the detection time, and the connector and the power supply control from the battery are performed. By supplying a standby current to the transmitter via the means, power (power for signal output) can be supplied to the transmitter. Then, when the moving unit comes into contact with the obstacle, the contact is closed in the power supply control circuit, and a closed circuit including the battery, the connector, the second resistor, the first resistor, the capacitor, the diode, and the contact is formed, and the capacitor is formed. Charging of the battery is started. As a result, the base current flows through the first transistor, so that the first transistor is turned on, and power from the battery is supplied to the transmitter via the connector and the first transistor. When the moving unit comes into contact with the obstacle in this manner, power is supplied from the battery to the transmitter. When power is supplied to the transmitter, a predetermined signal is output.

Thereafter, when the capacitor is fully charged, the charging current to the capacitor stops flowing, so that the base current does not flow to the first transistor, the first transistor turns off, and the power supply to the transmitter is automatically stopped. Is done.

When the moving unit comes into contact with an obstacle in this way, power is supplied from the battery to the transmitter, but the power supply is limited only while the capacitor is being charged.
The power of the battery can be prevented from being wasted, and the life of the battery can be significantly extended.

Further, after a lapse of a first predetermined time from the start of movement of the moving unit (for example, after a lapse of time required for the moving unit to move from the movement start position to the movement end position), the connector is in an open state, The battery is completely disconnected from other components. That is, at a time when there is no need to supply power, the battery and the other components are completely shut off, and the standby current does not flow, so that the power consumption of the battery can be further reduced.

Further, in the second invention, when the obstacle is removed and the moving portion does not contact the obstacle and the contact is opened, a base current flows from the capacitor through the third resistor to the second transistor, and the second current flows through the second transistor. The transistor turns on. This allows
The charge stored in the capacitor is discharged via the second transistor.

The only resistor that affects the time constant in this discharge is the on-resistance of the second transistor. However, the on-resistance of the second transistor is extremely small as compared with the conventional resistance, so the time constant in the discharge is extremely small. Become. Therefore, the capacitor can be discharged very quickly. Thus, even when the moving unit contacts the obstacle a plurality of times in a short time, it is possible to reliably output a predetermined signal from the transmitter each time.

[Effect of the invention]

As described above, according to the first invention, the power supply from the battery to the transmitter is stopped when the second predetermined time elapses from the start, so that the battery power is wasted. This can prevent the battery life and significantly extend the life of the battery.

Also, in the second invention, since the power supply from the battery to the transmitter is limited only while the capacitor is being charged, it is possible to prevent the battery power from being wasted. This has the effect of significantly extending the life of the battery.

Further, according to the first or second invention, after a lapse of a first predetermined time from the start of movement of the moving unit, that is, at a time when there is no need to supply power, the connector is in an open state, and the battery and the battery are connected. Since it is completely cut off from other components and the standby current does not flow, the effect that the power consumption of the battery can be further reduced can be obtained.

Furthermore, according to the second invention, even when the moving unit comes into contact with an obstacle a plurality of times in a short time, the discharge of the capacitor is performed very quickly, so that a predetermined signal is reliably output from the transmitter at each time. Can also be obtained.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In this embodiment, the present invention is applied to an obstacle detection device for an electric shutter which is attached to the electric shutter and transmits an obstacle detection signal to a receiver using infrared rays. As shown in FIG. 2 and FIG. 3, both sides of the shutter curtain 10 are guided by a metal guide rail 21 having a substantially U-shaped cross section that extends from the lintel portion 16 to the floor surface 17. It is configured to move up and down. The upper end of the shutter curtain 10 is attached to a winding shaft 23, and the winding shaft 23 is connected to a motor via a chain 25.
The rotation of the shutter curtain 10 causes the shutter curtain 10 to be wound or rewound, thereby allowing the shutter curtain 10 to move up and down.

At the lower end of the shutter curtain 10, a seat plate switch 12 and a seat plate switch that are turned on when an obstacle or the like abuts.
A transmitter 14 having a light-emitting unit 40 that emits infrared rays when 12 is turned on is attached. This transmitter 14 also has
A power supply circuit 36 including batteries such as dry batteries and storage batteries is connected. A mechanical vibration / acceleration sensor 34 is connected to the power supply circuit 36. The lintel section 16 is provided with a light receiving section 19, which is connected via a receiver 18 to a control circuit 20 to which a motor 22 for opening and closing the shutter curtain is connected. An operation device for raising, lowering, and stopping the shutter curtain is connected to the control circuit 20.

As shown in FIG. 1, the power supply circuit 36 includes a timer 26 for supplying the battery B and the transmitter 14 with the power of the battery B for a predetermined time. This timer 26
Is connected to a vibration / acceleration sensor 34.

The timer 26 is turned off after a predetermined period of time that has been set after being turned on by the vibration / acceleration sensor 34, and is substantially equal to the time required for the shutter curtain to move from the upper limit position to the lower limit position. Equal time is set. The timer 26 is connected to the emitter of the transistor T2. The collector of the transistor T2 is connected to the transmitter 14. A resistor R3 is connected between the emitter and the base of the transistor T2. The base of the transistor T2 is grounded via a contact R of the seat switch 12, and a charge / discharge circuit composed of a resistor R2, a resistor R and a capacitor C.

Hereinafter, the operation of this embodiment will be described. When the shutter curtain 10 is lowered by operating the operation device, the start of the lowering operation is detected by the vibration / acceleration sensor 34 at the initial stage of the lowering operation, and the timer 26 is turned on. As a result,
Battery B power can be supplied to the transmitter 14. In this state, when the seat switch 12 contacts the obstacle and the contact S is closed, the charging current flows from the battery B to the capacitor C via the resistor R3, the resistor R2, the capacitor C, and the contact S. A base current flows through T2, turning on the transistor T2. As a result, power is supplied from the battery B to the transmitter 14 via the transistor T2, and the light emitting unit emits light. When the capacitor C is fully charged, the charging current stops flowing and the transistor T2 is turned off, thereby stopping the supply of power to the transmitter 14. When the contact S is opened in this state by removing an obstacle or the like, the electric charge stored in the capacitor C is discharged through the resistor R.

An infrared ray is emitted from the light emitting unit 40 according to a signal output from the transmitter 14, and the emitted infrared ray is received by the light receiving unit 19, converted into an electric signal, and received by the receiver 18. The receiver 18 outputs a received signal to the control circuit 20 when receiving the signal. The control circuit 20 stops the motor 22 to stop the operation of the shutter curtain 10 when the reception signal is input, or causes the motor 22 to rotate in the reverse direction to raise the shutter curtain 10. When a predetermined time has elapsed, a timer
26 is turned off and the transmitter 14 and battery B are cut off.

Next, a second embodiment of the present invention will be described with reference to FIG. In this embodiment, a power supply circuit shown in FIG. 4 is used in place of the above power supply circuit. In this embodiment, the same parts as those in the above embodiment are denoted by the same reference numerals, and description thereof will be omitted.
The base of the transistor T2 is a resistor R2, a capacitor C,
It is grounded via a diode D and a contact S of the seat plate switch 12. Transistor in parallel with capacitor C
T1 is connected. That is, the collector of the transistor T1 is connected to the connection point between the capacitor C and the resistor R2, and the emitter of the transistor T1 is connected to the capacitor C and the diode D2.
Is connected to the connection point. A resistor R1 is connected between the collector and the base of the transistor T1. This resistor R1 is for flowing a base current to the transistor T1. Since the base current of the transistor is usually about several μA, the size of the resistor R1 is set to a large value (for example, 300 KΩ). The base of the transistor T1 is connected between the diode D and the contact S.

Hereinafter, the operation of this embodiment will be described. Similarly to the above, when the start of the lowering operation of the shutter curtain is detected by the vibration / acceleration sensor 34, the timer 26 is turned on, and the battery B and the emitter of the transistor T2 are connected. Contact S
In the open state, the emitter voltage is higher than the base voltage, so that the transistor T2 is off, so that no power is supplied to the transmitter 14. When the contact S is closed, a charging current flows from the battery B via the resistor R3, the resistor R2, the capacitor C, the diode D, and the contact S.
As a result, charging of the capacitor C starts, and
A base current flows through the transistor T2 to turn on the transistor T2, and a current is supplied from the battery B to the transmitter 14 via the transistor T2. When the capacitor C is fully charged, the charging current stops flowing, so that the base current stops flowing to the transistor T2, and the transistor T2 turns off. As a result, the supply of power to the transmitter 14 is stopped.

When the contact S is opened in the above state, a base current flows from the capacitor C to the transistor T1 via the resistor R1, and the transistor T1 is turned on. As a result, the electric charge stored in the capacitor C is discharged via the transistor T1. At this time, the diode D is in the cut-off state. At this time, the time constant is
And the on-resistance of the transistor T1. Since the on-resistance of the transistor T1 is extremely small, the time constant becomes extremely small and discharge can be performed very quickly.

According to the present embodiment, even if an obstacle contacts the seat switch 12 a plurality of times in a short period of time, the discharge is rapidly performed, so that the obstacle detection signal can be reliably output.

In each of the above embodiments, an example has been described in which a transistor and a charging / discharging circuit are provided and power is supplied to the transmitter 14 while a charging current is flowing from the time when the contact of the seat switch is turned on. The charge / discharge circuit may be omitted and the configuration shown in FIG. In this case,
When the vibration / acceleration sensor detects the start of the lowering operation of the shutter curtain, power is supplied to the transmitter itself, and when the contact point S is turned on, an obstacle detection signal is output from the transmitter.

In the above description, the signal is transmitted from the transmitter to the receiver using infrared rays. However, the signal may be transmitted using radio waves, ultrasonic waves, or the like.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a first embodiment of the present invention, FIG. 2 is a schematic diagram in which the present invention is applied to an electric shutter, FIG. 3 is a side view of FIG. 2, and FIG. FIG. 5 is a circuit diagram showing a second embodiment of the present invention, and FIG. 5 is a circuit diagram showing a third embodiment of the present invention. 12: Seat switch, 26: Timer, 34: Vibration / acceleration sensor.

Claims (2)

(57) [Scope of request for utility model registration] 1. An obstacle detection device provided in a moving unit and having a battery and a transmitter for outputting a predetermined signal, wherein the detector detects a start of movement of the moving unit, and one end is connected to the battery. A connector that is closed to enable supply of power to the transmitter until a first predetermined time has elapsed from when the detection of the start of movement of the moving unit by the detector; Connected to the other end, the other end is connected to the transmitter, when the moving unit abuts on an obstacle, starts power supply to the transmitter, and after a lapse of a second predetermined time from the start of the power supply And an electric power supply control means for stopping the electric power supply. 2. An obstacle detection device provided in a moving unit and comprising a battery and a transmitter for outputting a predetermined signal, wherein the detector detects start of movement of the moving unit, and one end is connected to the battery. A connector which is in a closed state to enable supply of power to the transmitter until a first predetermined time has elapsed since the detection of the start of movement of the moving unit by the detector; and A contact that closes only when in contact,
A capacitor connected in series with the contact, a first resistor connected in series with the capacitor, an emitter connected to the other end of the connector, a collector connected to the transmitter, and a base connected to the first A first transistor connected to the first resistor, a second resistor connected between the emitter and the base of the first transistor, and an anode provided between the capacitor and the contact, the anode being connected to the capacitor. A diode connected and having a cathode connected to the contact; a collector connected between the first resistor and the capacitor; an emitter connected between the capacitor and the diode; and a base connected to the diode and the diode. A second transistor connected between the contact and a third resistor connected between a collector and a base of the second transistor; Comprise providing the a power supply control circuit configured obstacle detection apparatus according to claim.