JPH0644833B2 - Remote control position detector - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a position detecting device for a wireless remote controller using infrared light as a medium.

2. Description of the Related Art As a position detecting device for a remote controller, as shown in FIG. 5, a position detecting signal output from a remote controller via an infrared light emitting diode having a wide directional output is used for a plurality of narrow directional signals arranged in mutually different directions. Light is received by the light receiving elements 5a to 5d having characteristics, amplified, tuned and detected by the amplifiers 6a to 6d corresponding to the respective elements, and input to the input ports G, H, I and J of the microcomputer 7, respectively. There is one that compares the intensities of the received light outputs and detects the position direction of the remote controller.

Problems to be Solved by the Invention In the above-described conventional configuration, since the received light currents to be compared in magnitude are amplified and compared by a plurality of amplifiers, the number of components is large, the cost and mounting space are large, and many microcomputers are used. There was a problem that the I / O port of In addition, the accuracy of signal size comparison is poor due to gain variations of a plurality of amplifiers corresponding to a plurality of detection elements,
Since the magnitude relationship may be reversed, it was necessary to provide a gain adjustment circuit in each amplifier.

Means for Solving the Problems Remote control position detection signal light receiving means for respectively receiving infrared signals transmitted from a remote control by a plurality of light receiving elements, and signal switching means for switching a plurality of signals from the remote control position detection signal light receiving means. , A signal amplifying means for amplifying / tuning / detecting a signal from the signal switching means and a switching signal to the signal switching means, and after a sufficient time has elapsed, inputting a level signal from the signal amplifying means, It is composed of control means for determining the position.

According to the present invention, with the above configuration, the signals from the plurality of light receiving elements are amplified, tuned and detected by one amplifier circuit based on the switching signal from the microcomputer, and the level signal is input to the microcomputer after a lapse of a certain time. Due to
It is possible to use stable data with sufficient noise removal, and it is a compact system with few parts,
The remote control position can be detected with high accuracy.

Embodiment An embodiment of the present invention will be described below with reference to FIGS. 1 to 4 of the accompanying drawings.

FIG. 1 is a block diagram of a remote controller position detecting device according to an embodiment of the present invention.

In FIG. 1, the position detection signal light receiving means has a plurality of detection elements. The signal switching means switches the signal from the detection element. The signal amplification means amplifies, tunes, and detects the signal from the signal switching means. The control means sends a switching signal to the signal switching means, inputs the level signal from the signal amplifying means, compares and calculates the remote control position.

FIG. 2 is a circuit diagram of the remote controller position detecting device in the embodiment of the present invention, and FIG. 3 is a timing diagram.

In FIGS. 2 and 3, 1a to 1d are light receiving elements, which receive a position detection signal (infrared signal) from the wireless remote controller. 2a to 2d are changeover switches, which are connected to the light receiving elements 1a to 1d. 2e is the changeover switch 2
It is a switching control unit of a to 2d. A to D are output terminals of the changeover control unit, CLK is a changeover signal input terminal of the changeover control unit, and the changeover switches 2a to 2d are sequentially changed over in synchronization with the changeover signal from the microcomputer at 4. A signal amplifier 3 amplifies, tunes, and detects a weak signal passing through the changeover switches 2a to 2d. 4 is a microcomputer. E
Is a level input terminal of the microcomputer and is connected to the output terminal of the amplifier 3. F is an output terminal of the microcomputer and is connected to the CLK terminal of the switching control section 2e.

Further, as shown in FIG. 3, F is Hi-Lo at an interval of Ti.
A waveform is output and input to CLK to set A to "Hi" to turn on the changeover switch 2a. Thereby, the light receiving element 1
The signal from a is adopted and amplified by the amplifier 3 to a level detectable by the microcomputer 4. At this time, a capacitor and an amplifier 3 for reducing the noise component from the signal
The input waveform of E (the output waveform of the amplifier 3) becomes an integral waveform due to the circuit constants of Eq. Therefore, the microcomputer 4 outputs "Hi" to F and then inputs it after Tdly, so that stable data is taken in as data of the light receiving element 1a. Similarly, the data of the light receiving elements 1b to 1d are fetched. Based on these data, comparison / arithmetic processing is performed to detect the relative position of the remote controller.

FIG. 4 is a flow chart showing an example of software of the microcomputer. In the figure, a to i represent steps. The operation of the control device will be described with reference to FIG.

First, when an interrupt for each Ti occurs, it is determined in step a whether or not the position of the remote controller is detected. When position detection is not performed, the process jumps to step h.

If position detection is to be performed, the process proceeds to step b. Step b
Input level from port E. Next, in step c, "Hi" is output from the port F. In step d, the data input in step b is stored in RAM according to the counter value.
Save to. In step e, the counter value is incremented. In step f, it is determined whether the value of the counter is 4 or more. If it is less than 4 (0 to 3), the process jumps to step h, and if it is 4 or more, the process proceeds to step g. In step g, the counter is set to "0". Port F at step h
Outputs "Lo". Then, in step i, the interrupt routine returns. With such a configuration, stable data is input from the port E about Ti = T after the rise of the port E. Then, according to the value of the counter, the light receiving elements 1a to 1
Based on the data corresponding to 1d, the remote controller position is accurately detected by comparing and calculating.

EFFECTS OF THE INVENTION According to the present invention, the signal from a plurality of light receiving elements is amplified, tuned, and detected by one amplifier circuit based on the switching signal from the microcomputer, and the level signal is input to the microcomputer after a certain period of time. By doing
It is possible to use stable data with sufficient noise removal, and it is a compact system with few parts,
It has a great effect such that a remote control position detection system that is stable in operation and highly reliable can be configured.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the present invention, FIG. 2 is a circuit diagram of an embodiment of the present invention, FIG. 3 is a timing chart, FIG. 4 is a flowchart showing operation, and FIG. 5 is a conventional circuit diagram. Is. 1a, 1b, 1c, 1d ... Light receiving element, 2a, 2b, 2
c, 2d ... Changeover switch, 2e ... Changeover control unit, 3 ...
... amplifier, 4 ... microcomputer, 5a, 5b,
5c, 5d ... Light receiving element, 6a, 6b, 6c, 6d ...
Amplifier, 7 ... Microcomputer.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Bibliography Showa 63-121935 (JP, U) Showa 63-183761 (JP, U) Japanese Patent Publication 4-63293 (JP, B2)

Claims (1)

[Claims] 1. A remote control position detection signal light receiving means for respectively receiving infrared signals transmitted from a remote control with a plurality of light receiving elements, a signal switching means for switching a plurality of signals from the remote control position detection signal light receiving means, and the signal. Signal amplifying means for amplifying / tuning / detecting the signal from the switching means,
The control signal is outputted to the signal switching means, and the level signal from the signal amplifying means is inputted to the control means for judging the position of the remote controller. The level signal is inputted after a sufficient time has elapsed from the output of the switching signal. Remote control position detection device.