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1. 发明公开

EP2109101A2 Optical signal detecting circuit and information reproducing device using the same 有权
标题翻译： Optische Signalerfassungsschaltung und Informationswiedergabevorrichtung，die eine solche verwendet
公开(公告)号：EP2109101A2
公开(公告)日：2009-10-14
申请号：EP09005261.4
申请日：2009-04-09
申请人： Hitachi Ltd.
发明人： Kurokawa, Takahiro , Mikami, Hideharu
IPC分类号： G11B7/0037 , G11B7/005 , G11B7/09
CPC分类号： G11B7/13 , G01J1/4228 , G01J1/44 , G11B7/09 , G11B20/10009
摘要： An object of the present invention is to achieve both low noise and fast response in an optical signal detecting circuit capable of providing all of three signals--a focus error signal, a tracking error signal, and an RF signal--with only a single detection system. A single current-to-voltage converter (111; 112; 113; 114) converts a current signal obtained by adding currents flowing through two photodiodes (101; 102; 103; 104), into a voltage signal. Not only currents flowing into the photodiodes, but also currents flowing out from the photodiodes are taken out as the voltage signals. Moreover, by applying two different reference voltages to the current-to-voltage converters (111, 112, 113, 114), a reverse bias voltage is applied between the terminals of each photodiode.
摘要翻译：本发明的目的是在能够提供三个信号的全部三个信号的光信号检测电路中实现低噪声和快速响应 - 聚焦误差信号，跟踪误差信号和RF信号 - 仅具有单个检测系统。单个电流 - 电压转换器（111; 112; 113; 114）将通过将流过两个光电二极管（101; 102; 103; 104）的电流相加而获得的电流信号转换成电压信号。不仅流入光电二极管的电流，还有从光电二极管流出的电流作为电压信号被取出。此外，通过对电流 - 电压转换器（111,112,113,114）施加两个不同的参考电压，在每个光电二极管的端子之间施加反向偏置电压。

2. 发明授权

EP2109101B1 Optical signal detecting circuit and information reproducing device using the same 有权
标题翻译：使用光信号检测电路和信息再现装置，例如一个
公开(公告)号：EP2109101B1
公开(公告)日：2012-07-04
申请号：EP09005261.4
申请日：2009-04-09
申请人： Hitachi, Ltd.
发明人： Kurokawa, Takahiro , Mikami, Hideharu
IPC分类号： G01J1/42 , G01J1/44 , G11B7/09 , G11B7/13
CPC分类号： G11B7/13 , G01J1/4228 , G01J1/44 , G11B7/09 , G11B20/10009

3. 发明公开

EP2109101A3 Optical signal detecting circuit and information reproducing device using the same 有权
标题翻译：光信号检测电路和再现装置，从而
公开(公告)号：EP2109101A3
公开(公告)日：2010-10-13
申请号：EP09005261.4
申请日：2009-04-09
申请人： Hitachi Ltd.
发明人： Kurokawa, Takahiro , Mikami, Hideharu
IPC分类号： G11B7/0037 , G11B7/005 , G11B7/09 , G11B7/13
CPC分类号： G11B7/13 , G01J1/4228 , G01J1/44 , G11B7/09 , G11B20/10009
摘要： An object of the present invention is to achieve both low noise and fast response in an optical signal detecting circuit capable of providing all of three signals--a focus error signal, a tracking error signal, and an RF signal--with only a single detection system. A single current-to-voltage converter (111; 112; 113; 114) converts a current signal obtained by adding currents flowing through two photodiodes (101; 102; 103; 104), into a voltage signal. Not only currents flowing into the photodiodes, but also currents flowing out from the photodiodes are taken out as the voltage signals. Moreover, by applying two different reference voltages to the current-to-voltage converters (111, 112, 113, 114), a reverse bias voltage is applied between the terminals of each photodiode.

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