发明授权
- 专利标题: Recording apparatus with double frequency driven liquid crystal shutter
- 专利标题(中): 具有双频驱动液晶快门的录音设备
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申请号: US650521申请日: 1984-09-14
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公开(公告)号: US4641156A公开(公告)日: 1987-02-03
- 发明人: Morio Ohta , Shizuo Tsuchiya , Yoshito Nakano , Masaru Aikawa , Seiji Asaumi
- 申请人: Morio Ohta , Shizuo Tsuchiya , Yoshito Nakano , Masaru Aikawa , Seiji Asaumi
- 申请人地址: JPX Tokyo JPX Tokyo
- 专利权人: Casio Computer Co., Ltd.,Casio Electronics Manufacturing Co., Ltd.
- 当前专利权人: Casio Computer Co., Ltd.,Casio Electronics Manufacturing Co., Ltd.
- 当前专利权人地址: JPX Tokyo JPX Tokyo
- 优先权: JPX58-249054 19831230; JPX59-8607 19840123; JPX59-111955 19840531
- 主分类号: G01D15/14
- IPC分类号: G01D15/14 ; G06K15/12 ; H04N1/036 ; H04N1/193 ; H04N1/40
摘要:
In the recording apparatus of this invention, liquid crystal light shutter operates by using the double frequency drive. The double frequency drive utilizes signals of a high frequency f.sub.H and lower frequency f.sub.L. The dielectric anisotropy of liquid crystal matrial becomes positive in the case of the frequency f.sub.L lower than crossover frequency f.sub.C and becomes negative in the case of the frequency f.sub.H higher than the frequency f.sub.C. When the data signal including the signal of the frequency f.sub.L for a final period of a writing cycle Tw, is applied to write selection electrodes and data signal electrodes, liquid crystal light shutter is kept open for the final period of the writing cycle Tw, namely, opening or closing state of the shutter which is caused during a selection period can be eliminated.
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