JPS6186819U - - Google Patents
Info
- Publication number
- JPS6186819U JPS6186819U JP17265784U JP17265784U JPS6186819U JP S6186819 U JPS6186819 U JP S6186819U JP 17265784 U JP17265784 U JP 17265784U JP 17265784 U JP17265784 U JP 17265784U JP S6186819 U JPS6186819 U JP S6186819U
- Authority
- JP
- Japan
- Prior art keywords
- resistor
- light
- optical recording
- resistors
- variable
- 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
- 230000003287 optical effect Effects 0.000 claims description 5
- 201000009310 astigmatism Diseases 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 1
Landscapes
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案の光学式記録再生装置の回路図
、第２図は非点収差法によるフオーカス制御の原
理図、第３図は従来の光学式記録再生装置の回路
図、第４図はフオーカス制御回路のブロツク図で
ある。
１……受光素子、２……差動増幅器、３……ス
ポツト、２０……演算増幅器、４１…フオーカス
モータ、４２……鋸歯状波発生回路、４３……イ
コライザ、４４……スイツチ、４５……制御回路
。
Fig. 1 is a circuit diagram of the optical recording/reproducing apparatus of the present invention, Fig. 2 is a principle diagram of focus control using the astigmatism method, Fig. 3 is a circuit diagram of a conventional optical recording/reproducing apparatus, and Fig. 4 is a circuit diagram of the optical recording/reproducing apparatus of the present invention. FIG. 3 is a block diagram of a focus control circuit. DESCRIPTION OF SYMBOLS 1... Light receiving element, 2... Differential amplifier, 3... Spot, 20... Operational amplifier, 41... Focus motor, 42... Sawtooth wave generation circuit, 43... Equalizer, 44... Switch, 45 ...control circuit.
Claims (1)
分割された受光素子と、４つに分割された該受光
素子のうち対角線上に位置する各受光素子の出力
の加算信号の差信号を得る差動増幅器とを有し、
該差動増幅器を、該加算信号が各々供給される第
１及び第２の抵抗と、入力が該第１の抵抗と該第
２の抵抗とに各々接続された演算増幅器と、該演
算増幅器の出力と入力との間に接続された帰還用
の第３の抵抗と、該演算増幅器の一方の入力と所
定の基準電位との間に接続された第４の抵抗とで
構成し、該第１乃至第４の抵抗のうちの少なくと
もいずれか１つを可変とすることを特徴とする光
学式記録再生装置。 (2) 該第４の抵抗が可変であることを特徴とす
る実用新案登録請求の範囲第１項記載の光学式記
録再生装置。[Claims for Utility Model Registration] (1) A light-receiving element divided into four parts that receives light with astigmatism, and each light-receiving element located diagonally among the four divided light-receiving elements. and a differential amplifier that obtains a difference signal between the summed signals of the outputs of the elements,
The differential amplifier includes first and second resistors each supplied with the addition signal, an operational amplifier whose inputs are connected to the first resistor and the second resistor, respectively; a third resistor for feedback connected between the output and the input; and a fourth resistor connected between one input of the operational amplifier and a predetermined reference potential; An optical recording/reproducing device characterized in that at least one of the to fourth resistors is variable. (2) The optical recording and reproducing device according to claim 1, wherein the fourth resistor is variable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17265784U JPS6186819U (en) | 1984-11-14 | 1984-11-14 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17265784U JPS6186819U (en) | 1984-11-14 | 1984-11-14 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6186819U true JPS6186819U (en) | 1986-06-06 |
Family
ID=30730320
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17265784U Pending JPS6186819U (en) | 1984-11-14 | 1984-11-14 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6186819U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02230517A (en) * | 1989-03-03 | 1990-09-12 | Pioneer Electron Corp | Optical head |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58189841A (en) * | 1982-04-30 | 1983-11-05 | Toshiba Corp | Matrix circuit for detecting optical pickup error |
-
1984
- 1984-11-14 JP JP17265784U patent/JPS6186819U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58189841A (en) * | 1982-04-30 | 1983-11-05 | Toshiba Corp | Matrix circuit for detecting optical pickup error |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH02230517A (en) * | 1989-03-03 | 1990-09-12 | Pioneer Electron Corp | Optical head |
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