Title:
情報再生装置および面振れ測定方法
Document Type and Number:
Japanese Patent JP4469375
Kind Code:
B2
Abstract:
The present invention relates to an information reproducing apparatus that includes an objective lens that focuses a light beam toward a rotating optical disc medium and uses the objective lens to focus the light beam onto the optical disc medium and detect the reflected light of the light beam so as to reproduce information stored on the optical disc medium. The present invention allows measurement of surface deflection of the optical disc medium with no risk of collision between the objective lens and the optical disc medium. The objective lens is brought closer to the optical disc medium from a separate position apart from the optical disc medium and immediately moved away from the optical disc medium when the light beam is focused onto the optical disc medium.
Inventors:
Kabe Takayuki
Application Number:
JP2006553773A
Publication Date:
May 26, 2010
Filing Date:
January 18, 2005
Export Citation:
Assignee:
富士通株式会社
International Classes:
G11B7/085; G11B7/09
Domestic Patent References:
| JP2004326927A | ||||
| JP5234241A | ||||
| JP2001250243A |
Attorney, Agent or Firm:
Masaki Yamada
Mikami Yui
Mikami Yui
Previous Patent: 長期予測符号化方法、長期予測復号化方法、これら装置、そのプログラム...
Next Patent: 移動電話、移動電話を用いてキャッシュレス取引を行うための方法及びコ...
Next Patent: 移動電話、移動電話を用いてキャッシュレス取引を行うための方法及びコ...