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AssigneeSamsung Electronics Co., Ltd.
InventorsYeong-woong Kim, Ick-hyoung Yoo, Chul-woo Lee, Byeong-ho Park, Chang-geun Kim
Estimating the term…
A high-density recording optical head for increasing recording density in an optical head for recording and reproducing information optically. The disclosed optical head is provided with an iris for transmitting or passing the central portion of the reflected light when the light reflected from a medium is transmitted by an ordinary objective lens. Another iris is also provided for transmitting or reflecting the periphery of the reflected light and, in this case, an improved objective lens structure including two inner and outer elements is provided. Therefore, in the disclosed optical head, only light reflected from the actual recording region is detected as a reproduction signal. According to the disclosed optical head, high-density recording in identical media becomes possible.
A high-density recording optical head for recording and reproducing information optically on and from a medium comprising a light source, an objective lens for focusing incident light on a medium and light reflected from the medium, a photodetector for detecting the reflected light, and an iris for passing a central portion of the reflected light from said objective lens to said photodetector, whereby only light reflected from a recording region of said medium is detected as a reproduction signal.
A high-density recording optical head for recording and reproducing information optically on and from a medium comprising a light source, an objective lens for focusing incident light on a medium and light reflected from the medium, a photodetector for detecting the reflected light, said objective lens including an inner element for focusing a central portion of the incident light and an outer element for focusing a peripheral portion within the light focused by said inner element, said inner and outer elements being concentric, and an iris for transmitting a peripheral portion of the reflected light directed from said objective lens to said photodetector, whereby the degree of focusing of the light incident on a recording region of the medium is increased and only light reflected from the recording region as a reproduction signal is detected.
A high-density recording optical head for optically recording information on and reproducing information from a medium comprising a light source, an objective lens for focusing incident light on a medium and light reflected from the medium, a photodetector for detecting the reflected light, said objective lens including an inner element for focusing a central portion of the incident light and an outer element for focusing a peripheral portion within the light focused by said inner element, said inner and outer elements being concentric, and an iris for reflecting a peripheral portion of the reflected light directed from said objective lens to said photodetector, whereby the degree of focusing of the light incident on a recording region of the medium is increased and only light reflected from the recording region as a reproduction signal is detected.
Dependencies are inferred from the claim text.