OUTGOING LIGHT BEAM MEASURING APPARATUS AND METHOD OF OPTICAL PICKUP

Japanese Patent JP2006023219

A

To provide an outgoing light beam measuring apparatus of an optical pickup which measures the characteristics such as aberration of the optical pickup easily and is constituted at a low price.

The outgoing light beam measuring apparatus of the optical pickup focuses a collimated light beam emitted from the optical pickup onto a predetermined position by a converging lens as a beam spot, defocuses the outgoing light beam from the optical pickup by moving the converging lens by a predetermined amount in the optical axis direction, and detects astigmatic difference showing the degree of astigmatism on the basis of a plurality of beam spot images photographed by changing the defocused state. The outgoing light beam measuring apparatus is only required to be arranged so that the beam spot is positioned on a photographing means. The outgoing light beam measuring apparatus can thereby perform measuring operation for the optical pickup easily. Compared to a comparative example which uses a high-priced interferometer, the outgoing light beam measuring apparatus can be constituted at a remarkably low price.

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MIYATA YASUHISA
NAKABASHI MASAHIRO
TOSA NOBUO
KANAKUBO MITSUHIRO
ISHIKAWA MASASHI

JP2004202832A

January 26, 2006

July 09, 2004

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PIONEER ELECTRONIC CORP
PIONEER FA KK

G01M11/02; G01M11/00; G11B7/135; G11B7/22

JPH03296643A	1991-12-27
JPH0415535A	1992-01-20
JPH01251326A	1989-10-06
JP2002062220A	2002-02-28

Satoshi Nakamura
Tatsuo Egami

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