Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1995-12-26
1998-02-24
Dzierzynski, Paul M.
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359 19, 359566, 369 4423, 369 4414, 369109, G02B 532, G02B 518, G11B 700
Patent
active
057216290
ABSTRACT:
A dual-focus forming method for both a 0.6 mm disk and a 1.2 mm disk, which prevents the increase of wave-front aberration caused by a refractive lens, utilizes a hologram lens having hologram devices respectively formed on the receive and emitting-planes of a transparent plate. The receiving-plane hologram device diffracts incident light from a light source into a zero-order light beam and a 1st-order diffracted light beam, and the emitting-plane hologram device diffracts the zero-order transmitted light beam and 1st-order diffracted light beam into two 1st-order diffracted light beams for being focused onto one or the other disk. The hologram lens exhibits good optical performance due to its low wave-front aberration and is easy to manufacture at low cost.
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Y. Komma et al., "Dual Focus Optical Head for 0.6 mm and 1.2 mm Disks," Optical Review, vol. 1, No. 1, 1994, pp. 27-29.
Chang Audrey
Dzierzynski Paul M.
Samsung Electronics Co,. Ltd.
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