JPH10336760A - Receiver and remote control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a power consumption of a receiver and to attain an optimization of a reception standby condition by automatically adjusting an intermittent cycle in accordance with a reception standby condition so that a lowering of a response between a transmitter and a receiver is minimized. SOLUTION: A standby time measuring timer 39 measures time passed from a final operation. An intermittent cycle control part 38 keeps an intermittent reception standby condition by controlling a switching circuit 37 and turning on and off a reception circuit 31 and, at the same time, gradually prolongs the intermittent cycle of turning on and off of the power supply of the reception circuit 31 in accordance with the time passed from the final operation measured by the standby time measuring timer 39.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a receiver and a remote control device. More specifically, the present invention relates to a receiver that receives a spatially propagated signal such as radio waves or infrared rays emitted from a transmitter. Further, the present invention relates to a remote control device using the receiver.

[0002]

2. Description of the Related Art In recent years, a transmitter transmits a spatially propagated signal (radio signal) such as radio waves or infrared rays to a receiver mounted on a vehicle or the like, and remotely locks or unlocks a door lock device of the vehicle or the like. Remote control devices adapted to perform such operations are widely used. This is called a keyless entry device or the like.

As shown in FIG. 1, a remote control device (keyless entry device) 1 includes a portable transmitter 4 having a locking operation button 2 and an unlocking operation button 3, and a vehicle or the like. And a receiver 6 mounted on the receiver. Then, as shown in FIG. 2, when the locking operation button 2 or the unlocking operation button 3 of the transmitter 4 is pressed, a signal is transmitted from the transmission antenna 5 of the transmitter 4 on radio waves or infrared rays. Upon receiving the signal from the transmitter 4 by the receiving antenna 7, the receiver 6 outputs a control signal corresponding to the content of the code included in the signal to the door lock actuator 8 for driving the door lock device, and Lock or unlock a door lock device such as 9.

[0004] A signal transmitted from the transmitter 4 to the receiver 6 includes a unique code for maintaining security together with a command code for instructing locking or unlocking. The unique code is registered in both the transmitter 4 and the receiver 6 in advance, and when the unique code is transmitted from the transmitter 4 to the receiver 6 via a signal, the receiver 6 sets the unique code of the transmitter 4 as the unique code. The receiver 6 compares its own unique code with the own unique code, and outputs a control signal so that the operation specified by the command code is performed only when the unique code matches.

[0005] In such a remote control device 1, it is not possible to predict when the transmitter 4 will be operated and when it is, so that the receiver 6 must always be turned on to be in a reception standby state. . However, vehicle 9
The receiver 6 mounted on the vehicle uses a vehicle-mounted battery (storage battery) generally mounted on the vehicle as a power source.
In order to reduce the consumption of the battery while the vehicle is stopped and to prevent the battery from running down, it is necessary to reduce the current consumption of the receiver 6 as much as possible.

Therefore, as a means for realizing power saving while always keeping the receiver 6 in a reception standby state, an intermittent operation of intermittently supplying the power of the receiving circuit, that is, alternately turning on and off the power is performed. . As shown in FIG. 3, for example, a configuration for intermittently operating the receiving circuit 10 includes a switching circuit 12 for opening and closing the battery 11 and the receiving circuit 10, and a control unit (CPU) 1 for opening and closing the switching circuit 12.
It consists of three. The control unit 13, as shown in FIG.
The switching circuit 12 is repeatedly turned on and off with a constant power-on time Ton and a constant power-off time Toff, and the power supplied to the receiver 6 is turned on and off intermittently.

The current consumption efficiency η of the receiver 6 due to this intermittent operation is expressed as η = [Ton / (Ton + Toff)] × 100%. Therefore, in order to change the power consumption suppression efficiency η, it is sufficient to change the duty ratio of the power on and off, but the lower limit of the power on time Ton is normal after the receiver 6 is turned on. Since it is uniquely determined by the time until start (setup time) and the transmission speed of the communication code, the power consumption suppression efficiency η is generally changed by adjusting the power-off time Toff. Therefore, if the intermittent period Ton + Toff of the power supply is turned on and off is increased, the current consumption suppression efficiency η is improved, and if the intermittent period Ton + Toff of the power supply is turned off, the current consumption suppression efficiency η is deteriorated.

[0008]

However, in the receiver 6 in which the power supply is intermittently operated as described above, if the intermittent period Ton + Toff is lengthened, the response speed (response) between the transceivers 4 and 6 is deteriorated. Therefore, if the intermittent cycle is lengthened to improve the current consumption suppression efficiency η and suppress the current consumption, the response speed between the transmitters and receivers 4 and 6 deteriorates, and if the intermittent cycle is shortened to improve the response speed, And the current consumption suppression efficiency η is reduced, which is a conflicting condition. One of the “current consumption suppression efficiency η” and the “response speed” must be given priority and the other must be sacrificed according to the specifications. was there.

The present invention has been made in view of the above-mentioned drawbacks of the conventional example, and has as its object to suppress the current consumption of the receiver and minimize the decrease in the response between the transmitter and the receiver. Another object of the present invention is to automatically adjust the intermittent cycle according to the reception standby state to optimize the reception standby state.

[0010]

SUMMARY OF THE INVENTION According to a first aspect of the present invention, there is provided a receiver in which a receiving unit waits for reception while intermittently repeating a power-on state and a power-off state, and measures a time elapsed from a final operation. Means, and intermittent cycle control means for changing the intermittent cycle of the power supply on and off in accordance with the elapsed time from the final operation.

In the reception standby state, the power is turned on,
The part that is turned off is a part of the receiver, and the components for performing the intermittent operation of turning on and off the power are kept in the power-on state.

In the receiver according to the first aspect, the intermittent cycle is changed in accordance with the elapsed time from the last operation (hereinafter referred to as reception standby time). Can shorten the intermittent cycle and lengthen the intermittent cycle when the reception standby time becomes long.

That is, while the reception standby time is short, there is a high possibility that a signal will be received from the transmitter. Therefore, in that period, the intermittent period is shortened to give priority to the response speed, and conversely, the reception standby time becomes long. Accordingly, the possibility of receiving a signal from the transmitter is reduced, and in such a case where the apparatus is left for a long time, the intermittent cycle can be lengthened to give priority to power saving. Therefore,
For example, when the receiver is installed in a vehicle, it can simultaneously save power when the vehicle is left for a long time and improve the response speed when the vehicle is stopped for a short period of time. Can be achieved.

According to a second aspect of the present invention, in the receiver of the first aspect, means for determining whether or not the received signal is a legitimate signal and a signal for causing the receiving section to perform a receiving operation are provided. If the signal is not, the elapsed time from the last operation in the timing means and the power on, the intermittent cycle of the off,
Resetting means for setting a state before receiving operation by an irregular signal.

[0015] In the receiver, even when the activation code included in the signal is equal to the activation code of the normal signal, but the similar signal has a different identification code, the receiver switches to the continuous reception state. However, in this case, even if the activation code is received and the mode is switched to the continuous reception state, the reception error occurs when the identification code is read. Thereafter, when returning to the reception standby state where the power is intermittently turned on and off again, if the reception standby time or the intermittent cycle returns to the initial value, the intermittent cycle becomes the shortest state, and the current consumption is reduced by a similar signal. There is a disadvantage of being large.

Therefore, in this embodiment, in such a case, the reception standby time and the intermittent cycle of power-on / off are set as follows:
By returning to the state before receiving operation by an irregular signal, increase of current consumption by similar signal is prevented,
Power saving was achieved.

According to a third aspect of the present invention, there is provided a remote control apparatus comprising: the receiver according to the first or second aspect; and a transmitter for transmitting a signal to the receiver. It is characterized by comprising a clock means for measuring the elapsed time and a transmission code generation means for generating a transmission code having a length adapted to the intermittent period of the receiver according to the elapsed time from the last transmission.

According to a third aspect of the present invention, there is provided the remote control device, wherein the transmitter and the receiver have time-measuring means synchronized with each other. Since a transmission code having a length adapted to the intermittent period of the device can be generated and transmitted to the receiver, an optimum response speed between the transmitter and the receiver can be realized.

According to a fourth aspect of the present invention, there is provided a remote control apparatus comprising: the receiver according to the first or second aspect; and a transmitter for transmitting a signal to the receiver. Means for determining whether or not the operation has been performed more than a predetermined number of times, and a transmission code for generating a transmission code having a length adapted to the longest intermittent cycle of the receiver if the predetermined number of operations have been performed within a predetermined period Generating means.

When the length of the transmission code of the transmitter and the intermittent time of the receiver do not adapt, the transmitter and the receiver cannot be synchronized with each other, and the transmission code coincides with the power-off time of the receiver to perform normal reception. There is a risk that it will not be possible.

In such a case, one or more transmitter operations are performed immediately after the operation failure due to human behavioral habits. Therefore, this is detected and judged as a retry operation, and the maximum length of the receiver is intermittently operated. By transmitting a transmission code having a length adapted to the cycle, a fail-safe function can be realized.

[0022]

FIG. 5 is a block diagram showing a transmitter 21 according to an embodiment of the present invention, and FIG. 6 is a block diagram showing a receiver 22. The transmitter 21 and the receiver 22 are different from each other. A pair constitutes a remote control device. When the receiver 22 is mounted on a vehicle and the receiver 22 receives a regular radio signal from the transmitter 21, for example, the remote control device outputs a control signal from the receiver 22 to a door lock device of the vehicle to lock the door. It is used as a so-called keyless entry device for locking or unlocking the device (see FIG. 2).

As shown in FIG. 5, the transmitter 21 has an operation control unit 25 having an operation button 23 for locking (LOCK) and an operation button 24 for unlocking (UNLOCK), a communication code generation unit 26, The storage device 27 stores a unique code 42 and a command code 43, a transmission circuit (modulation circuit) 28, and a transmission antenna 29. Thus, the operator carrying the transmitter 21 operates the locking or unlocking operation buttons 23, 24.
When is pressed, the operation control unit 25 generates an operation trigger signal corresponding to the button operation and outputs a locking command or an unlock command to the communication code generation unit 26. The communication code generation unit 26
When receiving the locking command or the unlock command from the operation control unit 25, the unique code 42 and the command code 43
Is read, and a unique code 42 and a command code 43 are connected after the activation code 41 in accordance with a predetermined communication protocol to generate a communication code 40 as shown in FIG. Here, the unique (I
The D) code is a unique code for maintaining security, and each transmitter 21 has a unique code. The command code is a code for instructing a control content on the receiving side, that is, a locking or unlocking operation.

The communication code 40 output from the communication code generator 26 is sent to the transmission circuit 28. Communication code 4
0 is modulated in the transmission circuit 28 and the transmission antenna 2
Radiated from 9 to space. The modulation method in the transmission circuit 28 is not particularly limited, and ASK (Amplitude Shift Keyin) is used.
g), PSK (Phase Shift Keying), FSK (Frequen
Various digital modulation methods such as cy Shift Keying) can be adopted.

On the other hand, as shown in FIG.
It includes a receiving antenna 30, a receiving circuit (demodulating circuit) 31, a collation determining unit 32, a storage device 33 storing a unique code, and an output circuit 34. When the receiver 22 receives the communication code 40 radiated into the space from the transmitter 21 by the reception antenna 30, the receiver 22 restores the communication code 40 received by the reception circuit 31 to the original code. Next, the collation determination unit 32
Reads the unique code from the storage device 33, compares the unique code 42 included in the demodulated communication code 40 with the unique code read from the storage device 33, and determines that the unique codes match with each other. A locking control signal or an unlocking control signal is output from the output circuit 34 to the actuator of the door lock device in accordance with the contents of 43, and the actuator is driven to lock or unlock the vehicle door.

The entire receiver 22 is supplied with power from a battery 35 mounted on the vehicle. In particular, the receiving circuit 31 includes a voltage conversion circuit 36, a transistor 37a and a resistor 37b,
It is connected to the battery 35 via a switching circuit 37 composed of 37c. The power supply of the battery 35 is
The voltage is reduced to a predetermined voltage by the voltage conversion circuit 36 and is applied to the receiving circuit 31. By controlling the switching circuit 37 to be on or off, the switching circuit 37 is connected or disconnected from the receiving circuit 31. The switching circuit 37 is controlled to be turned on and off intermittently by negative logic by the intermittent cycle control unit 38, and the intermittent cycle control signal output from the intermittent cycle control unit 38 becomes low as shown in FIG. Then, the switching circuit 37 is turned on to supply power to the receiving circuit 31, and when the intermittent cycle control signal goes high, the switching circuit 37 is turned off and the receiving circuit 31 is disconnected from the battery 35. Therefore, the power of the receiving circuit 31 is intermittently turned on and off by the intermittent cycle control unit 38 so that the power on time Ton and the power off time Toff are alternately repeated.

Further, the waiting time measuring timer 39 measures the elapsed time (reception waiting time) from the last operation. That is, the standby time measurement timer 39 is connected to the output circuit 3
When the control signal is output from the terminal 4 (during the final operation), it is reset and started at the same time. Intermittent cycle controller 38
Changes the intermittent cycle Tw = Ton + Toff according to the reception standby time measured by the standby time measurement timer 39. For example, as shown in FIG. 9, _assuming that the intermittent cycle is _Tw1 until the reception standby time elapses one hour from the final operation, the intermittent cycle is doubled after the reception standby time elapses one hour ( _Tw2 = 2T _w1 ), after one day of reception standby time, the intermittent cycle is further doubled (T _w3 = 2)
_Tw2 ), after one week of reception standby time, the intermittent cycle is further doubled ( _Tw4 = _2Tw3 ). Here, the intermittent cycle Tw is the sum of the power-on time Ton and the power-off time Toff. When the intermittent cycle is lengthened, the power-off time Toff is extended while the power-on time Ton remains constant.

The collation judging section 32 and the intermittent cycle control section 3
Reference numeral 8 denotes a microcomputer (CPU), and the standby time measuring timer 39 and the timer for the intermittent operation are constituted by an internal timer of the microcomputer. Further, in order to operate the receiver 22 intermittently, even when the power of the receiving circuit 31 is off,
Power sources such as the intermittent cycle control unit 38 and the standby time measurement timer 39 need to be kept on at all times, but the collation determination unit 32 and the output circuit 34 should be turned on and off intermittently in the reception standby state. You may.

When the receiver 22 is in the reception standby state,
When the communication code 40 is transmitted from the transmitter 21 while the receiving circuit 31 is operating intermittently, the receiver 22 receives the activation code 41 to continuously change from the intermittent reception standby state, as shown in FIG. The state shifts to the reception state, and the unique code 42 and the command code 43 are sequentially received. It should be noted that the communication code 40 can improve security by adding a rolling code, an error detection code, and the like.

In the receiver 22, the intermittent cycle is lengthened according to the length of the reception waiting time from the last operation (final locking operation or unlocking operation). For example, in a delivery vehicle or the like, the transmitter 21 is often operated in a short time, and in such a case, it is desirable to give priority to responsiveness. Further, in a vehicle that is parked in a garage and left for a long period of time, it is desirable to give priority to power saving even if response is somewhat sacrificed. In the case of a vehicle used at an appropriate frequency, an intermediate state is desirable. In the receiving device of the present invention, the intermittent period can be automatically adjusted by judging the situation from the elapsed time from the time of the last operation to the time of the reception, so that the power saving when the vehicle is left for a long time and the short time can be achieved. It is possible to simultaneously improve the response speed when the vehicle is stopped, and to automatically optimize the reception standby state.

FIG. 11 is a flowchart for explaining the operation of the receiver 22 in the reception standby state and continuous reception. When the receiver 22 locks or unlocks (S12), the intermittent cycle control unit 38 initializes the standby time measurement timer 39 to Tw = 0 (S1). Next, the receiving circuit 31 is operated intermittently so that the power-on time Ton and the power-off time Toff are repeated. That is, the intermittent cycle control unit 38
Is turned on (S2), and it is monitored whether or not the activation code 41 is received until the power-on time Ton elapses (S3, S4). The power is turned off (S5), and the power-off time Tof
During the period f, the receiving circuit 31 is kept off (S7).

When the receiving circuit 31 is turned off, the intermittent cycle control unit 38 updates the value of the off time Toff according to the reception standby time (S6). For example, the off-time Toff is set according to the relationship shown in FIG.

When receiving the activation code 41 while monitoring the reception of the activation code 41 in the power-on state of the receiving circuit 31 (S3), the receiving circuit 31 is switched to the continuous receiving state (S8), The code 42 is received (S9). Then, the received unique code 42 and its own unique code are collated by the collation determination unit 32 (S10).
If they match, the command code 43 is received continuously (S11),
A control signal corresponding to the instruction content of the instruction code 43 is output from the output circuit 34 to lock or unlock the door lock device (S12).

(Second Embodiment) As shown in FIG. 13 (c), the activation code 41 indicates that the power supply off time T
If the activation code 41 is shorter than off, and the activation code 41 overlaps the power-off time Toff, the receiver 22 may not receive a signal. In order to avoid this, if the length of the communication code 40 is constant, it is necessary to match the length of the activation code 41 with the longest intermittent period Tw. There is.

FIG. 12 shows a transmitter 51 according to another embodiment of the present invention, which is intended to solve the above-mentioned disadvantages. The transmitter 51 has a standby time measurement timer 52 for measuring an elapsed time (transmission standby time) since the last transmission, and the communication code generation unit 26 measures the standby time measurement timer 52. The activation code 41 having a length substantially equal to the intermittent cycle Tw in the receiver 22 is generated according to the elapsed time from the last transmission. That is, in response to the transmission from the transmitter 51, the locking or unlocking operation occurs on the receiver 22 side, and it is considered that the final transmission of the transmitter 51 and the final operation of the receiver 22 match. Therefore, the communication code generation unit 26 calculates the intermittent cycle Tw in the receiving circuit 31 according to the transmission standby time, and sets the length of the activation code 41 to be equal to or slightly longer than the determined intermittent cycle Tw. I do.

In this transmitter 51, FIG.
(A) As shown in (b), the length of the activation code 41 is changed in synchronization with the change of the intermittent period Tw in the receiving circuit 31, the transmission time of the activation code 41 is Ts, and the intermittent receiver 22 is intermittent. If the cycle is Tw = Ton + Toff, T
By satisfying the condition of s> Tw, reception can be performed with a delay of one cycle at the worst, and a constant operation is realized.

FIG. 14 is a flowchart illustrating the operation of the transmitter 51. When the transmitter 51 transmits the communication code 40 (S26), the standby time measurement timer 5 of the transmitter 51
2 is initialized to T = 0 (S27), and waits until a button is operated (S21). When the locking operation button 23 or the unlocking operation button 24 is operated, the communication code generation unit 26 monitors the value of the standby time measurement timer 52 and responds to the value of the standby time measurement timer 52 (transmission standby time). The determined activation code length is determined (S22). Next, the unique code 42 and the command code 43 are read from the storage device 27 (S23,
(S24), the activation code 41, the unique code 42, and the command code 43 are connected to synthesize the communication code 40 (S2).
5), the communication code 40 is modulated by the transmission circuit 28 and transmitted from the transmission antenna 29 (S26). Next, the standby time measurement timer 52 is initialized to T = 0 again, and the operation of the operation button is waited (S27, S21).

(Third Embodiment) In the transmitter 51 according to the second embodiment, when the transmitter 51 is operated at a position where radio waves do not reach the receiver 22 mounted on the vehicle, or when noise or the like is detected. When the signal being received in the receiving circuit 31 is interrupted due to the influence of, for example, the intermittent period Tw of the receiver 22
Is not reset, the transmission standby time of the transmitter 51 returns to 0, and the activation code length becomes the shortest. Immediately after this, if the transmitter 51 is operated again, the activation code length remains shorter than the intermittent period of the receiving circuit 31, so that no matter how much the communication code 40 is sent from the transmitter 51, the communication code 40 is not received by the receiver 22. is there.

A transmitter 53 according to still another embodiment of the present invention shown in FIG. 15 can solve such a problem. The transmitter 53 includes a retry operation determination unit 54 and a timer 55. The timer 55 measures the time interval between button operations, and the retry operation determination unit 54 performs the operation twice or three times within a certain time. If the button operation has been performed a predetermined number of times or more, it is determined that the operation button is a retry operation of the operation button.

That is, when the operator carrying the transmitter 53 operates the operation button, the transmitter 53 transmits the communication code 40 corresponding to the operation button, and the receiver 22 receives the communication code 40 normally. And controls the connection device such as an actuator to perform some operation such as motor rotation and light emission. After the button is pressed, the operator recognizes whether or not the operation has been performed normally with the five senses by listening to the operation sound of the vehicle actuator and the door lock device, and observing the movement of the door lock knob of the vehicle door. To judge. If the operator determines that the operation is normal, the operation ends at that point, and the transmitter 53 is not operated until the next operation opportunity. On the other hand, if the operator determines that the operation has failed or the operation is abnormal, the operator unconsciously performs the retry operation. Since the retry operation repeatedly hits the operation button at a very short time interval, it is possible to determine whether or not the retry operation is performed based on whether a plurality of button operations have been performed within a short fixed time. Based on such a principle, the retry operation determination unit 54 determines that a retry operation is performed if a predetermined number of button operations are performed within a certain period of time.

When the retry operation determination section 54 determines that the operation is a retry operation, the activation code length of the transmitter 53 and the intermittent cycle T
Since there is a possibility that w has a mismatch, when receiving a signal indicating that retry has been determined from the retry operation determining unit 54, the communication code generation unit 26 sets the activation code length to the longest. When the activation code length is set to the longest, the length of the activation code becomes longer than the longest intermittent period Tw of the receiver 22, so that the above-described problem can be avoided, and the communication code 40 by the re-operation from the transmitter 53 can be reliably transmitted to the receiver 22. It will be received.

FIG. 16 is a flowchart showing the operation of the transmitter 53 according to this embodiment. When the transmitter 53 transmits the communication code 40 (S38), the standby time measurement timer 52 of the transmitter 53 is initialized to T = 0 (S39), and waits until a button is operated (S31). When the locking operation button 23 or the unlocking operation button 24 is operated, the retry operation determination unit 54 determines whether the operation is a retry operation (S32), and transmits the determination result to the communication code generation unit 26. . If the retry operation determination unit 54 determines that the retry is not a retry, the communication code generation unit 26 monitors the value of the standby time measurement timer 52 and responds to the value of the standby time measurement timer 52 (transmission standby time). The activation code length is determined (S33).
When the retry determination unit determines that the retry is performed, the communication code generation unit 26 sets the activation code length to the maximum length regardless of the transmission standby time (S34). Next, the unique code 42 and the command code 43 are stored in the storage device 27.
Are read out (S35, S36), the start code 41, the unique code 42 and the command code 43 are connected to form the communication code 4
0 are synthesized (S37), the communication code 40 is modulated by the transmission circuit 28 and transmitted from the transmission antenna 29 (S3).
8). Next, the standby time measurement timer 52 is initialized again to T = 0, and waits for operation of the operation button (S39, S3).
1).

In this embodiment, the retry operation is determined based on the operation frequency of the operation buttons within a certain period of time. However, when the operator presses a plurality of operation buttons at the same time or when the operation buttons are pressed for a predetermined period of time. The retry operation determination unit 54 may determine that the operation is a retry operation when the button is kept pressed.

(Fourth Embodiment) In the receiver 22 which performs the processing as shown in FIG. 11, when the same activation code 41 and the similar communication code 40 having different unique codes 42 are received, the reception standby time of the reception circuit 31 Is reset to zero. Thus, signals from other transmitters 53 of the same type that transmit similar communication codes 40 are often
Is reset, the intermittent cycle Tw is set to the shortest, and the current consumption suppression efficiency η may be deteriorated due to the influence of the other transmitter 53.

In order to avoid this, as shown in the process of the receiver 22 shown in FIG. 17, after the activation code 41 is received and the continuous reception state is established (S3, S8), the received unique code 42 is transmitted. If they do not match (S9, S10),
The standby time measurement timer 52 may not be initialized, and the reception standby time and the intermittent cycle may be returned to the state before receiving the similar code.

In the above embodiment, the case where radio waves are used as the communication means has been described, but it goes without saying that spatial propagation signals other than radio waves may be used. For example, infrared light may be emitted from a light emitting unit provided in the transmitter, and the light receiving unit of the receiver may receive the infrared signal.

[Brief description of the drawings]

FIG. 1 is a schematic block diagram showing a configuration of a conventional remote control device.

FIG. 2 is an explanatory diagram of a use state of the REIT control device.

FIG. 3 is a diagram showing a configuration for intermittently supplying power to a receiving circuit of the above receiver.

FIG. 4 is a time chart illustrating a state where power is intermittently supplied to a receiving circuit.

FIG. 5 is a schematic block diagram illustrating a transmitter according to an embodiment of the present invention.

FIG. 6 is a schematic block diagram illustrating a receiver according to an embodiment of the present invention.

FIG. 7 is a diagram showing a configuration of a communication code.

FIGS. 8A and 8B are diagrams illustrating timings when the power of the receiving circuit is turned on and off by an intermittent cycle control unit.

FIG. 9 is a diagram illustrating an example of a relationship between a reception standby time and an intermittent cycle.

FIG. 10 is a diagram illustrating power-on and power-off changes when a receiving circuit receives a communication code.

FIG. 11 is a flowchart for explaining the operation of the receiving circuit of the above.

FIG. 12 is a block diagram showing a configuration of a transmitter according to another embodiment of the present invention.

13A and 13B are diagrams showing the intermittent period of the receiving circuit and how the activation code of the transmitter changes, and FIG. 13C is a diagram for explaining the inconvenience when the activation code length is constant.

FIG. 14 is a flowchart illustrating an operation of the transmitter according to the embodiment.

FIG. 15 is a block diagram showing a configuration of a transmitter according to still another embodiment of the present invention.

FIG. 16 is a flowchart illustrating an operation of the transmitter according to the embodiment.

FIG. 17 is a flowchart illustrating an operation of a receiver according to still another embodiment of the present invention.

[Explanation of symbols]

 21, 51, 53 Transmitter 22 Receiver 31 Receiving circuit 35 Battery 37 Switching circuit 38 Intermittent cycle control unit 39 Waiting time measuring timer of receiver 52 Waiting time measuring timer of transmitter 54 Retry operation determining unit 55 Timer

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI E05B 65/20 E05B 65/20 H04Q 9/02 H04Q 9/02 B

Claims (4)

[Claims] 1. A receiver in which a receiving section waits for reception while intermittently repeating a power-on state and a power-off state, and a timer means for measuring an elapsed time since the last operation; Intermittent cycle control means for changing an intermittent cycle of power on / off in accordance with the power supply. 2. A means for judging whether or not a received signal is a legitimate signal; and, if the signal for which the receiving section has been operated to receive is not a legitimate signal, the time elapsed since the last operation in the timing means. 2. The receiver according to claim 1, further comprising: a reset unit that sets an intermittent cycle of power-on and power-off to a state before a reception operation is performed by an irregular signal. 3. 3. The receiver according to claim 1, comprising: a transmitter for transmitting a signal to the receiver; the transmitter comprising: a timer for measuring an elapsed time from a last transmission; A remote control device comprising: a transmission code generation unit configured to generate a transmission code having a length adapted to an intermittent cycle of a receiver according to an elapsed time from a last transmission. 4. A receiver according to claim 1 or 2, and a transmitter for transmitting a signal to the receiver, wherein the transmitter determines whether or not a predetermined number of operations have been performed within a predetermined period. A remote control comprising: a determination unit; and a transmission code generation unit configured to generate a transmission code having a length adapted to the longest intermittent period of the receiver when a predetermined number of operations have been performed within a predetermined period. apparatus.