JPS6284827U

JPS6284827U -

Info

Publication number: JPS6284827U
Application number: JP17519285U
Authority: JP
Priority date: 1985-11-14
Filing date: 1985-11-14
Publication date: 1987-05-30

Description

[Brief explanation of the drawing]

第１図は、本考案による座標読取装置のブロツ
ク図、第２図は本考案による位相検出器の回路図
、第３図は本考案の位相検出器のタイミング図、
第４図は従来の座標読取装置のブロツク図、第５
図は従来の位相検出器のブロツク図、第６図は従
来の座標読取装置のタイミング図、第７図は励磁
コイルの位置と誘導信号との関係を示す説明図で
ある。１……タブレツト、１０２……Ｘ走査回路、１
０３……Ｙ走査回路、４……カウンタ、５……発
振器、６……励磁回路、７……励磁コイル、８…
…座標値レジスタ、１０……信号処理回路、１１
……増幅器、１２……位相検出器、１３……ロー
パスフイルタ、１４……コンパレータ、１２５…
…トランジスタ、１２８……第１のアナログスイ
ツチ、１２９……第２のアナログスイツチ、１２
０……インバータ。 FIG. 1 is a block diagram of a coordinate reading device according to the present invention, FIG. 2 is a circuit diagram of a phase detector according to the present invention, and FIG. 3 is a timing diagram of the phase detector according to the present invention.
Figure 4 is a block diagram of a conventional coordinate reading device, and Figure 5 is a block diagram of a conventional coordinate reading device.
FIG. 6 is a block diagram of a conventional phase detector, FIG. 6 is a timing diagram of a conventional coordinate reading device, and FIG. 7 is an explanatory diagram showing the relationship between the position of the exciting coil and the induction signal. 1...Tablet, 102...X scanning circuit, 1
03... Y scanning circuit, 4... Counter, 5... Oscillator, 6... Excitation circuit, 7... Excitation coil, 8...
...Coordinate value register, 10...Signal processing circuit, 11
...Amplifier, 12...Phase detector, 13...Low pass filter, 14...Comparator, 125...
...Transistor, 128...First analog switch, 129...Second analog switch, 12
0...Inverter.

Claims

[Claims for Utility Model Registration] A coordinate indicator having an excitation coil that generates a magnetic field, a tablet having a large number of sense lines laid in parallel so as to be electromagnetically coupled to the excitation coil, and sequentially selecting the sense lines. A coordinate reading device having a scanning circuit, means for detecting a phase reversal of the induced signal induced in the sense line, and a counter for measuring the time from the start of scanning to the time when the phase reversal is detected. In the above, the means for detecting phase reversal includes: (a) outputting a signal having the same phase with respect to the input signal and simultaneously outputting a signal having the opposite phase with respect to the input signal, furthermore, the amplitudes of the two output signals are equal; (b) connecting the input terminals of two analog switches to the two output terminals of the bipolar circuit, respectively;
The output terminals of each analog switch are connected to each other and to the output terminal of the phase reversal detection means, (c) ON/Off of the two analog switches
A coordinate reading device characterized in that two control signals for controlling the F state are signals having phases different from each other by 180° and synchronized with an excitation signal of the excitation coil.