FIELD: optical heads for recording video and audio information into or reading it out of record medium. SUBSTANCE: optical head designed for using disks of different thickness in one disk unit has objective lens of effective specified diameter mounted on light beam path in front of disk as well as light-beam control members arranged on light-beam path to control light beam in intermediate area located between close and distant axial areas of incident light beam so as to reduce spherical aberration effect. EFFECT: simplified design and reduced cost of device. 28 cl, 52 dwg
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|---|---|---|---|
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| OPTICAL CONVERTER | 1999 |
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| VIDEO CAMERA (DESIGN VERSIONS) | 1998 |
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| OPTICAL DEVICE ( VERSIONS ), MODULE OF LASER DIODE, OPTICAL CONNECTOR AND PROCESS OF MANUFACTURE OF OPTICAL CONNECTOR | 1996 |
|
RU2138835C1 |
