| 摘要 |
AN OBJECTIVE LENS DEVICE HAVING TWO LIGHT CONTROL SURFACES AND AN OPTICAL PICKUP ABLE TO ADOPT DISKS (20,30) HAVING CIFFERENT THICKNESSES AS A RECORDING MEDIUM (10) ARE PROVIDED. THE OBJECTIVE LENS DEVICE INCLUDES AN OBJECTIVE LENS (200;300;300’) ARRANGED ALONG AN OPTICAL PATH PARALLEL TO THE DISKS, AND FIRST AND SECOND CONTROL PORTIONS (21 1,213;31O330;310’,330’) FORMED IN A LIGHT INCIDENT SURFACE OF THE OBJECTIVE LENS, A LIGHT EMITTING SURFACE THEREOF, OR AN EXTRA TRANSPARENT MEMBER (210), THEREFORE, TWO DISKS (20,30) HAVING DIFFERENT THICKNESSES ARE COMPATIBLE AS A RECORDING MEDIUM (10), AND LIGHT INTERFERENCE OCCURRING WHEN USING A THICK DISK (30) CAN BE DECREASED.(FIG 6)
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