JPS62277892A - Remote control receiving equipment - Google Patents

Abstract

PURPOSE:To always make the photodetection sensitivity of an infrared photodetection element in the best condition by turning the direction of a photodetection part to the direction where the level of a receiving signal becomes high when the level of the receiving signal is under the prescribed level. CONSTITUTION:When a photodetection part 21 doesn't face a transmitter 1 and also a direct current level is in a level l3 (l3<l2), a motor voltage 800 is outputted from a motor drive circuit 29. Therefore an inversion circuit 30 transmits a motor voltage 900 to a motor 31 and drives the motor 31, and changes the direction of the photodetection part 21. As a result, when the turning direction of the photodetection part 21 is in the front direction of the transmitter 1, a direct current level 100 is increased. And when the direct current level 100 becomes larger than a reference level l2, a pulse 400 outputted from a logic circuit 25 is stopped, the rotation of the motor stops and the photodetection part 21 is stopped in this position, afterwards the remote control action is executed to finish the action of a receiver 2.

Description

Detailed Description of the Invention 3. Detailed Description of the Invention [Purpose of the Invention (Industrial Field of Application) The present invention is directed to the use of devices with wireless remote control functions such as televisions, video tape recorders, and air conditioners. The present invention relates to a remote control receiving device.

(Prior Art) In general, recent televisions and videotape recorders (
(VTR) and other devices generally have a wireless remote control function. In such a wireless remote control function, a transmitter equipped with an operating gear independent of the main body carrier allows remote control of power on/off of the main device, channel change, and operation mode. In the case of consumer devices equipped with such a remote control function, infrared remote control is the mainstream, and the transmitter side is equipped with an infrared light emitting element, and the main device side is equipped with an infrared light receiving element.

With this kind of infrared remote control, when you press a key on the transmitter side, the code signal corresponding to this key is 35~
The signal is modulated by 40 KH2, and the modulated signal is further converted into an infrared signal by an infrared light emitting element and radiated to the separate device side of the main body. The infrared receiving element on the main device side captures the emitted infrared signal and converts it into a weak electrical signal, which is further detected by an amplifier and detection circuit on the receiving side, and then the key code is determined by a microcomputer, etc. The main device is then controlled based on this key code.

However, infrared receiving elements used in conventional infrared remote controls generally have directivity and have the following drawbacks.

That is, when the transmitter 1 is placed at a position A in front of the main body carrier 2 as shown in FIG. The infrared light receiving element of the receiving section 21 has the highest sensitivity, and if the control signal is transmitted with the transmitter 1 positioned away from the front, such as in position B or position C, the sensitivity of the infrared light receiving element will deteriorate. However, there was a drawback that the reach distance of the received signal from the transmitting microscope 1 was reduced. Normally, the main device 2 such as a television or video tape recorder is fixed at a specific position in the room, but when operating the transmitter 1, it is not fixed and can be controlled at position A in Figure 4. However, at the position B or C, the sensitivity of the infrared light receiving element decreases as described above, and there is a possibility that the main body porcelain 2 cannot be controlled.

(Problems to be Solved by the Invention) As mentioned above, the infrared receiving element of the conventional infrared remote control has directivity, and the receiving sensitivity deteriorates depending on the position of the transmitter, and in some cases, remote control becomes impossible. There were drawbacks.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a remote control receiving device that can always maintain the best light-receiving sensitivity of an infrared receiving element regardless of the position of a transmitting microscope.

[Structure of the Invention] (Means for Solving the Problems) The remote control receiving device of the present invention includes a receiving section that receives a remote control signal transmitted from a transmitter, and a rotating mechanism that rotates the receiving section. an initial rotation stop circuit that does not allow the receiving section to rotate for a predetermined period after the level of the received signal received by the receiving section exceeds a first level; a receiving section drive circuit that rotates the reception section when the level of the received signal is above a second level and below a second level; and a receiving section driving circuit that reverses the direction of rotation of the receiving section if the level of the received signal decreases while the receiving section is rotating. an inverting circuit, a rotation stop circuit that stops the rotation of the receiving section when the received signal level exceeds a second level while the receiving section is rotating, and a rotation stop circuit that stops the rotation of the receiving section when the receiving signal level is lower than the second level when the transmitting remote control signal is stopped. and a terminal rotation stop circuit that prevents the receiving section from rotating when

(Function) In the remote control receiving device of the present invention, when the receiving section is not facing the direction of the transmitter and the received signal level is low, the receiving section driving circuit works to direct the receiving section toward the transmitter, and the receiving section is turned toward the transmitter. When the receiver faces the front of the transmitter, the rotation stop circuit operates and stops the receiver from changing direction, allowing the receiver to always operate in a highly sensitive state. Further, when the receiving section starts receiving a signal, the initial rotation stop circuit operates, and the receiving section driving circuit operates when the received signal level rises when the receiving section starts receiving the signal, so that the receiving section faces the front of the transmitter from the beginning. This prevents the receiver from rotating when the Furthermore, when the signal from the receiver ends, a final rotation stop circuit operates to prevent the receiver drive circuit from operating due to a fall in the received signal level, and rotates the receiver facing in front of the transmitter. This prevents this from happening.

(Example) An example of the present invention will be described below with reference to the drawings. 1st
The figure is a block diagram showing one embodiment of the remote control receiving device of the present invention. 1 is a transmitter that emits a remote control infrared signal; 2 is a receiver that receives the remote control signal; 21 is a light receiving unit that receives the remote control infrared signal and converts it into an electrical signal; 22
23 is an integrator that integrates the received signal sent from the light receiving section 21 and converts it into a DC level of 100.
0 with reference level 11, DC level 100 is 11
a comparator, 24, which outputs a pulse 200 if greater, compares the DC level 100 with the reference level 12;
Comparator 25 outputs pulse 300 when DC level 100 exceeds 12, and 25 outputs pulse 400 when pulse 200 is input but pulse 300 is not input.
26 is a differential circuit that outputs pulse 500 when the DC level 100 falls; 27 is a monostable multivibrator that outputs pulse 600 with a pulse width T2 at the fall of pulse 300; 28 is a pulse 20
29 is a monostable multivibrator that outputs a pulse 700 with a pulse width T1 at the rising edge of 0; a motor drive circuit 29 that outputs a motor voltage 800 when the pulse 400 is input and the pulses 600 and 700 are not input;
30 is a polarity inversion circuit that inverts the polarity of motor voltage 800 to obtain motor voltage 900 when pulse 500 is input;
A motor 31 is driven by a motor voltage 900 and rotates the light receiving section 21 .

FIG. 2 is a diagram showing a mechanism for rotating the light receiving section 21 by the motor 31 shown in FIG. 1, and FIG. 2(A) is a perspective view thereof, and FIG. 2(B) is a plan view thereof. The driving force of the motor 31 is transmitted to the light receiving section 21 via the gear 3, and the light receiving section 21 is rotated to, for example, the position a, the position b, and the position C. The orientation of element 211 can be changed.

Next, the operation of this embodiment will be explained with reference to the operation time chart of FIG. 3. The remote control infrared signal transmitted from the pre-transmission unit 1 is received by the light receiving unit 21 and converted into an electrical signal.

After this electrical signal is amplified, it is sent to a detection waveform shaper (not shown) to become a remote control code signal, and is also sent to the integrator 22. The integrator 22 converts the input signal into a DC level 100 as shown in FIG. The comparator 23 compares the DC level 100 with the reference level 11, and when the DC level exceeds the reference level, it outputs a pulse 200 as shown in FIG. 3(B), and the comparator 24 compares the input DC level with the reference level 11. If the DC level exceeds the reference level when compared with level 12, a pulse 300 as shown in Figure 3 (D>) is output. 100>, ei, so a pulse 200 is output as shown in FIG. 3(B) during this time.Also, between times t4 and 6 in FIG. 3(A), the DC level 100>'12. During this period, a pulse 300 is output as shown in FIG. 3 (D). As shown in (F), pulse 500 is output to the polarity inversion circuit 30. Pulse 200, 30 generated by comparator 23°24
0 is input to the logic circuit 25.The oh logic circuit 25 inputs the pulse 400 when there is a pulse 200 and no pulse 300.
In the example of FIG. 3(G), a pulse 400 is output to the motor drive circuit 29 between times t1 to t4 and times t6 to t7. Further, the pulses 200', 300 are input to the monostable multivibrator 28.27, and the monostable multivibrator 28. '27 is shown in Figure 3 (C), (E
), the pulse width T1. T2 pulse 700,
600 is output to the motor drive circuit 29. In the motor drive circuit 29, the pulse 400 is inputted, and the pulse 70
When one or both of 0 and 600 is not input, that is, from time 12 to t4 in FIG. 3(H), the motor voltage 800 for driving the motor 31 is output to the polarity reversing circuit 3o. Therefore, in the polarity reversing circuit 30, as shown in FIG.
As shown in FIG. 2, a motor voltage 900 obtained by inverting the motor voltage 800 is output to the motor 31 between times 2 and t3 and between times t3 and t4. Therefore, the motor 31 at time t2
It rotates in a direction between t3 and t3, and at time t3 and t4, it rotates in the opposite direction to the rotational direction, and at time t4, it rotates to K1.

Here, when the remote control infrared signal from the transmitting chestnut 1 is not received by the light receiving unit 21 in Figure 3 (A>), between time Q and time 11, the DC level 200 is level 11.
, 12, the logic circuit 25 does not generate the pulse 400 and the motor voltage 80
Since no zero is generated, the motor 31 is stopped. However, when input of the remote control infrared signal to the light receiving section 21 is started, the DC level 100 rises as shown in FIG. The pulse 200 is output from the comparator 24, and the pulse 300 from the comparator 24 is still not output.Therefore, the pulse 400 is generated from the logic circuit 25.However, as shown in FIG. 3(C), between times t1 and t2, Monostable multivibrator 28
Since the pulse 700 is output from the motor drive circuit 2
9, the motor voltage 800 is still not output as shown in FIG. 3(H). If the light receiving unit 21 faces the transmitter 1 at this time, then the time t1 to t2
During this period, the DC level was 100 as shown by the broken line in Fig. 3(A).
exceeds 122.

Therefore, the pulse 300 is output from the comparator 24, and the pulse 400 that has been output from the logic circuit 25 is stopped. Therefore, the motor voltage 800 is not output from the motor drive circuit 29 as it is, the motor 31 does not rotate, and the light receiving section 21 remains facing the transmitter 1 1. During this time, a predetermined remote control operation is not performed. Then, the transmission of the remote control infrared transmission signal from the transmitter 1 is completed.

On the other hand, in the case where the light receiving unit 21 does not face the transmitter 1 and the DC level is 10 as shown in FIG.
0 is at level i3 (1!3×12), when the pulse 700 becomes low level at time t2 as shown in FIG.
is output. For this reason, the polarity inversion circuit 30 is configured as shown in FIG.
As shown in 1), a motor voltage 900 is sent to the motor 31 to drive the motor 31 and change the direction of the light receiving section 21.

As a result, when the rotation direction of the light receiving section 21 is in the front direction of the transmitter 1, the DC level 100 increases. As a result, when the DC level 100 becomes higher than the reference level 12, the pulse 400 output from the logic circuit 25 is stopped, and the motor voltage 8 output from the two motor drive circuits is
00 is stopped, the rotation of the motor is stopped, the light receiving section 21 is stopped at this position, and then a remote control operation is performed and the operation of the receiver 2 is completed. However, if the receiving unit 21 begins to rotate from 2 at time 2 in FIG. > At time 3, a pulse 500 is output from the differentiating circuit 26 to operate the polarity inverting circuit 30.

Therefore, at time t3, the polarity of the motor voltage 900 output from the polarity reversing circuit 30 is reversed as shown in FIG. It starts rotating. Therefore, the DC level 100 begins to rise as shown in FIG.
is stopped, the motor 31 is stopped, and the rotation of the light receiving section 21 is stopped. After that, one mode control operation is performed.

When the transmission of the remote control infrared tank number from transmitter 1 is stopped at time 5 in Figure 3 (A), the DC level is 10.
0 begins to fall, and between times t6 and t7, the logic circuit 25 generates a pulse 400 again as shown in FIG. As shown, pulse 6 is output from monostable multivibrator 27.
Since 00 is output in the time width T2, the motor drive circuit 2
9, the motor voltage 800 is not output as shown in FIG. 3(H).

Therefore, the light receiving section 21 does not rotate during this time. That is, when the light receiving section 21 facing the transmitter 1 stops receiving the transmission signal from the transmitter 1, it is prevented from accidentally moving toward the pond. Note that the reference level 11.12 of the comparators 23 and 24 is the DC level 100 when no input is received from the light receiving section 21.
The level of 100 is 13, the level of the DC level 100 near the transmission signal reach distance when the light receiving section 21 receives light is 13, and the level of the light receiving section 21 is
When the level of DC level 100 at which the maximum sensitivity is obtained when receiving light is 15, 14 < 11 < 13 < 12 < j!
It is assumed that the value is set to 5. Also, pulse 6
00, 700 pulse width T1. -r2 shall be set to a value such that motor voltages 800 and 900 will not occur when remote control transmission/reception is started or stopped at maximum sensitivity.

According to this embodiment, when the light receiving section 21 of the receiver 2 is not facing the front direction of the transmitter 1, the light receiving section 21 is automatically
1 toward the front of the transmitting carrier 1, the light receiving section 21 always operates with high sensitivity, and the main device equipped with the receiving arm 2 is stabilized no matter where the transmitter 1 is located. It can be controlled remotely.

[Effects of the Invention] As described above, according to the remote control receiving device of the present invention, when receiving a remote control infrared signal from the transmitter 1, if the level of the received signal is below a predetermined level, the direction of the light receiving part is changed. By rotating the transmitter in a direction that increases the received signal level, the receiving sensitivity of the infrared receiving element is always in the best condition regardless of the position of the transmitter, resulting in stable remote control operation. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram showing an embodiment of the remote control receiving device of the present invention, and Fig. 2 shows a second...receiver.
21... Light receiving section 22... Integrator
23.24... Comparator 25... Logic circuit °26... Differentiating circuit 27, 28... Monostable multivibrator 29... Motor drive circuit 30.
...Polarity reversal circuit 31...Motor agent Patent attorney Rule Ken Chika Yudo Hiroshi UjiFig. 2Fig. 4

Claims (1)

[Claims] a receiving section that receives a remote control signal transmitted from the transmitter; a rotating mechanism that rotates the receiving section; an initial rotation stop circuit that does not perform a rotation operation; and after the predetermined period, if the level of the received signal is higher than the first level and lower than the second level,
a receiver drive circuit that rotates the receiver; an inversion circuit that reverses the direction of rotation of the receiver when the level of the received signal drops during rotation of the receiver; A rotation stop circuit that stops the rotation of the receiving section when the second level is exceeded, and a final rotation that prevents the receiving section from rotating when the received signal level falls below the second level when the transmitting remote control signal is stopped. A remote control receiving device comprising: a stop circuit.