JPS59144516U

JPS59144516U - optical scale reader

Info

Publication number: JPS59144516U
Application number: JP3952683U
Authority: JP
Inventors: 秀人岩岡; 浩二秋山
Original assignee: 横河電機株式会社
Priority date: 1983-03-18
Filing date: 1983-03-18
Publication date: 1984-09-27

Abstract

(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Brief explanation of the drawing]

第１図は従来装置の構成を示す図、第２図は受光素子の
構成を示す図、第３図は出力正弦波の波形を示す図、第
４図は本考案の一実施例を示す電気的構成図、第５図は
補間方法を説明するための図である。１・・・可干渉性光源、２・・・スケール、３・・・受
光素子、４．５・・・増幅器、６．７・・・比較器、８
・・・４分割回路、９・・・カウンタ、１０・・・表示
部、Ｌｌ、　Ｌ２・・・レンズ、ＨＭ・・・ハーフミラ
−１１１，１２・・・入力端子、１３．１４・・・ピー
ク値検出回路、１５゜１６・・・ホールド回路、１７・
・・比較器、１８・・・Ａ／Ｄ変換器、１９・・・カウ
ンタ、２０・・・表示部、２１・・・スイッチ制御回路
、２２・・・方向弁別回路、２３・・・演算回路、ＳＷ
１〜ＳＷ６・・・スイッチ、Ｃ１〜Ｃ１・・・コンデン
サ、Ｒ，、Ｒ２・・・抵抗。Fig. 1 is a diagram showing the configuration of a conventional device, Fig. 2 is a diagram showing the configuration of a light receiving element, Fig. 3 is a diagram showing the waveform of an output sine wave, and Fig. 4 is an electric diagram showing an embodiment of the present invention. FIG. 5 is a diagram for explaining the interpolation method. DESCRIPTION OF SYMBOLS 1... Coherent light source, 2... Scale, 3... Light receiving element, 4.5... Amplifier, 6.7... Comparator, 8
...4 division circuit, 9...Counter, 10...Display section, Ll, L2...Lens, HM...Half mirror 111, 12...Input terminal, 13.14...Peak Value detection circuit, 15°16...Hold circuit, 17.
... Comparator, 18 ... A/D converter, 19 ... Counter, 20 ... Display section, 21 ... Switch control circuit, 22 ... Direction discrimination circuit, 23 ... Arithmetic circuit , SW
1-SW6...Switch, C1-C1...Capacitor, R,, R2...Resistor.

Claims

[Scope of utility model registration request]

In an optical scale reading device that irradiates a scale with a coherent light source, creates two sine waves with different phases from reflected diffracted light, and digitally processes these sine waves to calculate the moving direction and moving distance of the scale. , counts the number of repetitions of the output signal of the reading head that outputs a repetitive sine wave signal corresponding to the displacement of the scale, detects the positive and negative peak values of the output signal, and calculates the output signal based on the voltage difference between these peak values. What is claimed is: 1. An optical scale reading device, characterized in that the above-mentioned repetition period is interpolated by A/D converting the above-mentioned repetition period.