JPH02253322A - Information input device - Google Patents

Abstract

PURPOSE:To simplify a switch information circuit and to improve its operability by preparing a switch information input circuit and a position information input circuit independently of each other. CONSTITUTION:A signal transmission means 1 contains a coordinate detecting transmitter 7, a transmission circuit 4, and a switch circuit 5. Plural electrode liens are prepared in the X and Y axis directions on a tablet 2, and a copper plate 2-4 is set between the insulated materials 2-2 and 2-3 and under an electrode line part 2-1. A switch corresponding to a desired frequency is turned on in a switch circuit 5, and the carrier wave excited by an oscillation circuit 4 is impressed to the tip of a signal transmission pen 6. Then a carrier wave signal is induced at the plate 2-4 of the tablet 2 and only a specific carrier wave is taken out via the filters 11 and 101 of a reception means 10. This specific carrier wave is transmitted by a control circuit 20 as the switch information. As a result, a switch information circuit is simplified together with improvement of its operability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an information input device for graphics, characters, etc., and particularly to a wireless pen-touch type information input device.

[Prior art and its problems] Various types of bench-touch information input devices have been proposed and used in the past, but most of the capacitive coupling methods apply pulses sequentially to electrode wires arranged on a digitizer, and The pulse was detected using a signal detection pen that was electrostatically coupled to the applied electrode wire. (Tokuko Showa 52-2373
Publication No. 9, Publication No. 53-19494, Publication No. 53-371
(See Publication No. 63, etc.) To improve this situation, Japanese Utility Model Publication No. 60-5395, filed by the present applicant, proposes a wireless type pen that eliminates the cable of the signal detection pen in order to improve operability. has been done. As of February 22, 1989, the applicant transmits signal radio waves from an indicator that touches a desired position on a tablet as an "information input device" and receives the transmitted radio waves with electrode wires inside the tablet. We proposed a method to identify the detection position of the received signal.

However, although this patent application dated February 22, 1989 does not specifically mention it, the circuit is complicated because the determination as to whether or not the pen is in contact with the tablet is also based on frequency modulation.

[Means for Solving the Problems] The present invention has been made to solve the above-mentioned conventional problems, and includes a first frequency oscillation circuit for generating position information and a first frequency oscillation circuit for generating pen switch information. a signal generator having a second frequency transmitting circuit and a carrier switching circuit therein; a tablet having an electrode line arranged along a coordinate axis for receiving a position information signal from the signal generator; and an electrode line of the tablet. means for detecting a signal from the tablet and inputting information on a contact position of the signal generator to the tablet;

The present invention proposes an information input device having a receiving plate made of a conductor placed directly under the electrode wires of the tablet in an area covered by the electrode wires of the tablet that receives a pen switch information signal from the signal generator. It is.

[Function] In the information input device of the present invention, a signal radio wave is transmitted from an indicator that comes into contact with a desired position of a tablet, and the transmitted radio wave is received by an electrode wire and a receiving board in the tablet, and the received signal is received. Specify the detection position and switch information.

[Embodiments] The present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic block diagram of the present invention, FIG. 2 is a longitudinal cross-sectional view of the tablet,
FIG. 3 is a waveform diagram. Reference numeral 1 indicates a signal transmitting means, reference numeral 2 indicates a tablet as a receiving means, and reference numeral 10 indicates a signal receiving means. The signal transmitting means 1 has a built-in coordinate detecting transmitter 7 including a transmitting circuit that applies a signal for generating position information to the signal transmitting pen 6, but this is not the gist of the present invention and will not be described here. Omit. The signal transmitting means 1 further includes a battery 31, a transmitting circuit 4, and a switch circuit 5.

Similar to conventional tablets, the tablet 2 has a plurality of electrode wires arranged in the X and Y axis directions, and this electrode wire portion 2-1
A conductive material plate (for example, a copper plate) 2-4 is arranged between the insulating materials 2-2 and 2-3 below. Each electrode wire is connected to signal receiving means 10, shown as a position detection receiver 8. The signal receiving means 10 further includes filters 11, 101 and amplifiers 12, 1 for extracting only carrier waves of a predetermined frequency.
02, detection circuit 13, 103 and comparison circuit 14゜10
4 is housed and connected to the control circuit 20.

Next, the operation will be explained. First, the switch corresponding to the desired frequency of the switch circuit 5 is turned on, power is supplied from the battery 3, the battery condition of the battery 4 is checked, and if the battery voltage is good, the oscillation circuit 4 excites the carrier wave. The signal is applied to the tip of the signal transmitting pen 6. (See Figure 3C)
Here, a carrier wave signal is induced in the copper plate 2-4 of the tablet 2, and only a specific carrier wave is extracted by filters 11, 101 in the receiving means 10 (see FIG. 3C), and amplified by amplifiers 12, 102. (See Figure 3C)
. The signals amplified by the amplifiers 12 and 102 are demodulated by the detection circuits 13 and 103, converted to a DC voltage (see Figure 3), and compared with a predetermined voltage (see Figure 3C) by the comparison circuits 14 and 104. If the voltage is higher than a predetermined voltage, it is taken out as an output (see FIG. 3C) and sent to the control port M20. This control circuit 2o processes it as switch information and sends it to the computer. In this embodiment, the switch circuit 5 is shown as two circuits, and the receiving means 10 is shown as two circuits, but the present invention is not limited thereto.

[Effects of the Invention] Since the present invention has the above configuration, the switch information input circuit is provided separately from the 1-position information input circuit, so the switch information circuit is simplified and operability is improved. .

[Brief explanation of the drawings] 4... Oscillation circuit, 2-4... Carrier wave switching device 6... Signal transmission pen, 10...
...Signal receiving means. 20...Control circuit (j q

Claims (1)

[Claims] a signal generator having therein a first frequency oscillation circuit for generating position information, a second frequency oscillation circuit for generating pen switch information, and a carrier switching circuit; and position information from the signal generator. a tablet having an electrode line arranged along a coordinate axis for receiving a signal; a means for detecting a signal from the electrode line of the tablet and inputting information on a contact position of the signal generator to the tablet; An information input device comprising a receiving plate made of a conductor placed directly under the electrode wires of the tablet in an area covered by the electrode wires of the tablet that receives pen switch information signals from a generator.