| 摘要 |
PURPOSE:To attain miniaturization of a photomagnetic information reader by using a polarization element containing a polarizer an analyzer unified in body. CONSTITUTION:A part of a collimated incident luminous flux 2 transmits through a non-coated part 20 of a reflection coated 18 beam splitter 6 and is made incident to the incident luminous flux surface of a polarization element 22 servig as a polarizing means. The polarization surface of the reflected luminous flux is rotated in response to the magnetizing direction of a recording medium 10. The change of said rotation amount transmits through the element 22 and is converted into an intensity change of the reflected luminous flux. That is, the record contents of the medium 10 are finally detected in the form of an intensity change of the reflected luminous flux. Thus it is possible to eliminate the use of both a polarizer and an analyzer having a high quenching ratio used with a conventional photomagnetic information reader. Then a new miniature information reader is obtained with use of the element 22 containing a polarizer and an analyzer unified in a body.
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