JPH0454021U - - Google Patents
Info
- Publication number
- JPH0454021U JPH0454021U JP9385090U JP9385090U JPH0454021U JP H0454021 U JPH0454021 U JP H0454021U JP 9385090 U JP9385090 U JP 9385090U JP 9385090 U JP9385090 U JP 9385090U JP H0454021 U JPH0454021 U JP H0454021U
- Authority
- JP
- Japan
- Prior art keywords
- output
- light receiving
- level
- reproduced signal
- adder circuit
- 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
Landscapes
- Optical Head (AREA)
- Optical Recording Or Reproduction (AREA)
Description
第１図は本考案による光学式記録再生装置の一
実施例を示すブロツク図、第２図は第１図に示す
電圧／電流変換回路の詳細な回路例を示す回路図
、第３図は同実施例の効果を説明するための波形
図、第４図は一般的な光学式記録再生装置の一構
成例を示すブロツク図、第５図は第４図に示す加
算部の詳細な回路例を示す回路図、第６図は第５
図に示す回路から出力される信号の一例を示す波
形図である。
１……受光素子（フオトダイオード）、２……
電流／電圧変換回路、３……加算回路、４……レ
ベル判定部（比較回路）、５……レベルダウン部
（電圧／電流変換回路）。
Fig. 1 is a block diagram showing an embodiment of the optical recording/reproducing device according to the present invention, Fig. 2 is a circuit diagram showing a detailed circuit example of the voltage/current conversion circuit shown in Fig. 1, and Fig. 3 is the same. A waveform diagram for explaining the effects of the embodiment, FIG. 4 is a block diagram showing an example of the configuration of a general optical recording/reproducing device, and FIG. 5 shows a detailed circuit example of the adding section shown in FIG. 4. The circuit diagram shown in Figure 6 is
FIG. 3 is a waveform diagram showing an example of a signal output from the circuit shown in the figure. 1... Light receiving element (photodiode), 2...
Current/voltage conversion circuit, 3... Addition circuit, 4... Level determination section (comparison circuit), 5... Level down section (voltage/current conversion circuit).
Claims (1)
よつて得られる反射光を複数の受光素子によつて
受光して得られる信号を加算して再生信号を生成
する光学式記録再生装置において、前記各受光素
子から出力される信号を加算して再生信号を生成
する加算回路と、この加算回路から出力される再
生信号の大きさが所定の値を越えているとき、こ
れを検出して検知信号を出力するレベル判定部と
、このレベル判定部から検知信号が出力されてい
るとき前記各受光素子から出力される信号のレベ
ルを低下させるレベルダウン部とを備えたことを
特徴とする光学式記録再生装置。 In an optical recording and reproducing apparatus that generates a reproduced signal by adding signals obtained by receiving reflected light obtained by irradiating light onto a recording surface of an information recording disk by a plurality of light receiving elements, the above-mentioned An adder circuit that adds the signals output from each light receiving element to generate a reproduced signal, and when the magnitude of the reproduced signal output from this adder circuit exceeds a predetermined value, this is detected and a detection signal is sent. and a level down section that lowers the level of the signal output from each of the light receiving elements when a detection signal is output from the level determination section. playback device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9385090U JPH0454021U (en) | 1990-09-06 | 1990-09-06 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9385090U JPH0454021U (en) | 1990-09-06 | 1990-09-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0454021U true JPH0454021U (en) | 1992-05-08 |
Family
ID=31831364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9385090U Pending JPH0454021U (en) | 1990-09-06 | 1990-09-06 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0454021U (en) |
-
1990
- 1990-09-06 JP JP9385090U patent/JPH0454021U/ja active Pending
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