Optical: systems and elements – Holographic system or element – Using a hologram as an optical element
Patent
1995-07-12
1997-07-01
Phan, James
Optical: systems and elements
Holographic system or element
Using a hologram as an optical element
359569, 359900, 369 4412, 369112, G02B 532
Patent
active
056444133
ABSTRACT:
An optical head apparatus consists of a semiconductor laser for radiating a light beam, a first collimator lens for collimating the light beam, a wedge-like prism for reshaping the light beam, a beam splitter for transmitting the light beam in an outgoing path and splitting the light beam in an incoming path, an objective lens for converging the light beam at an information medium in which information is stored, a plane type of hologram lens integrally formed with the objective lens for excessively correcting chromatic aberration of the objective lens to cancel out chromatic aberration of the collimator lens, a second collimator lens for converging the light beam split, a photo detector for detecting intensity of the light beam converged to obtain an information signal and servo signals, and an actuating unit for slightly moving the objective lens and the hologram lens according to the servo signals. A wavelength of the light beam is lengthened as intensity of the light beam is increased. Even though an astigmatic difference occurs in the semiconductor laser, the change of a focal length of the collimator lens cancels out the change of the astigmatic difference to prevent the occurrence of astigmatic aberration.
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Kato Makoto
Komma Yoshiaki
Mizuno Sadao
Nishino Seiji
Wada Hidenori
Jr. John Juba
Matsushita Electric - Industrial Co., Ltd.
Phan James
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