JPS6155742U - - Google Patents
Info
- Publication number
- JPS6155742U JPS6155742U JP1984141825U JP14182584U JPS6155742U JP S6155742 U JPS6155742 U JP S6155742U JP 1984141825 U JP1984141825 U JP 1984141825U JP 14182584 U JP14182584 U JP 14182584U JP S6155742 U JPS6155742 U JP S6155742U
- Authority
- JP
- Japan
- Prior art keywords
- operational amplifier
- capacitor
- inverting input
- input terminal
- voltage
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000003990 capacitor Substances 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Description
図面は本考案の一実施例を示すもので、第１図
ａは、筆記具の主要部を示す断面図、第１図ｂは
同図ａの−線矢視断面図、第２図は電子回路
の構成を示す図、第３図ａ〜ｃは第２図における
主要部の等価回路図である。
１…本体、２…ケース、３…ボールペン芯、４
ａ，４ｂ，４ｃ…バネ、５ａ，５ｂ…半導体歪み
ゲージ、１２…オペアンプ、１３，１４…スイツ
チ素子、１５…ＣＰＵ、１７…Ａ／Ｄ変換回路、
１８…認識部、Ｒｉ…入力抵抗、Ｒｆ…帰還抵抗
、Ｃ…コンデンサ。
The drawings show one embodiment of the present invention; FIG. 1a is a cross-sectional view showing the main parts of the writing instrument, FIG. 1b is a cross-sectional view taken along the - line in FIG. FIGS. 3a to 3c are equivalent circuit diagrams of the main parts in FIG. 2. 1...Body, 2...Case, 3...Ballpoint pen core, 4
a, 4b, 4c... Spring, 5a, 5b... Semiconductor strain gauge, 12... Operational amplifier, 13, 14... Switch element, 15... CPU, 17... A/D conversion circuit,
18...Recognition unit, Ri...Input resistance, Rf...Feedback resistance, C...Capacitor.
Claims (1)
アンプにバイアス電圧を与えるコンデンサと、上
記オペアンプの反転入力端子に上記コンデンサを
介して筆記入力信号を供給する手段と、上記オペ
アンプの反転入力端子と出力端子との間に上記コ
ンデンサを介して接続される帰還抵抗と、所定の
タイミング信号に同期して上記オペアンプの反転
入力端子と出力端子との間をシヨートして上記コ
ンデンサにオフセツト電圧を充電するスイツチ素
子とを具備し、上記コンデンサの充電電圧により
上記オペアンプのオフセツト電圧を相殺するよう
にしたことを特徴とするペン型入力装置のアンプ
。 an operational amplifier for amplifying a writing input signal; a capacitor for applying a bias voltage to the operational amplifier; means for supplying the writing input signal to an inverting input terminal of the operational amplifier via the capacitor; and an inverting input terminal and an output terminal of the operational amplifier. a feedback resistor connected between the two via the capacitor, and a switch element that charges the capacitor with an offset voltage by switching between the inverting input terminal and the output terminal of the operational amplifier in synchronization with a predetermined timing signal. An amplifier for a pen-type input device, characterized in that the offset voltage of the operational amplifier is offset by the charging voltage of the capacitor.
Priority Applications (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984141825U JPS6155742U (en) | 1984-09-19 | 1984-09-19 | |
| US06/754,394 US4751741A (en) | 1984-07-19 | 1985-07-11 | Pen-type character recognition apparatus |
| GB08517630A GB2162982B (en) | 1984-07-19 | 1985-07-12 | Pen-type character recognition apparatus |
| DE19853525921 DE3525921A1 (en) | 1984-07-19 | 1985-07-19 | RECOGNITION WRITING PEN |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1984141825U JPS6155742U (en) | 1984-09-19 | 1984-09-19 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6155742U true JPS6155742U (en) | 1986-04-15 |
Family
ID=30700166
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1984141825U Pending JPS6155742U (en) | 1984-07-19 | 1984-09-19 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6155742U (en) |
-
1984
- 1984-09-19 JP JP1984141825U patent/JPS6155742U/ja active Pending
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