IT8024923A0 - Impianto ed apparecchiatura di revelazione degli errori di messa a fuoco ottica. - Google Patents

Impianto ed apparecchiatura di revelazione degli errori di messa a fuoco ottica.

Info

Publication number
IT8024923A0
IT8024923A0 IT8024923A IT2492380A IT8024923A0 IT 8024923 A0 IT8024923 A0 IT 8024923A0 IT 8024923 A IT8024923 A IT 8024923A IT 2492380 A IT2492380 A IT 2492380A IT 8024923 A0 IT8024923 A0 IT 8024923A0
Authority
IT
Italy
Prior art keywords
detection
equipment
optical focusing
focusing errors
errors
Prior art date
Application number
IT8024923A
Other languages
English (en)
Other versions
IT1132757B (it
Inventor
Jacobus Petrus Josep Heemskerk
Hendrik Renes
Carel Arthur Jan Simons
Original Assignee
Philips Nv
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philips Nv filed Critical Philips Nv
Publication of IT8024923A0 publication Critical patent/IT8024923A0/it
Application granted granted Critical
Publication of IT1132757B publication Critical patent/IT1132757B/it

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0909—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only by astigmatic methods
IT24923/80A 1979-09-28 1980-09-25 Impianto ed apparecchiatura di revelazione degli errori di messa a fuoco ottica IT1132757B (it)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL7907216A NL7907216A (nl) 1979-09-28 1979-09-28 Optisch fokusfout-detektiestelsel.

Publications (2)

Publication Number Publication Date
IT8024923A0 true IT8024923A0 (it) 1980-09-25
IT1132757B IT1132757B (it) 1986-07-02

Family

ID=19833932

Family Applications (1)

Application Number Title Priority Date Filing Date
IT24923/80A IT1132757B (it) 1979-09-28 1980-09-25 Impianto ed apparecchiatura di revelazione degli errori di messa a fuoco ottica

Country Status (10)

Country Link
US (1) US4358200A (it)
JP (1) JPS5657013A (it)
AU (1) AU6270980A (it)
CA (1) CA1144792A (it)
DE (1) DE3035719A1 (it)
ES (1) ES495326A0 (it)
FR (1) FR2466787B1 (it)
GB (1) GB2059057B (it)
IT (1) IT1132757B (it)
NL (1) NL7907216A (it)

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JPH0630164B2 (ja) * 1985-12-16 1994-04-20 キヤノン株式会社 光ヘツド装置
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JPH0810854Y2 (ja) * 1986-05-12 1996-03-29 パイオニア株式会社 光磁気記録媒体再生装置
JPH07114025B2 (ja) * 1986-06-13 1995-12-06 三菱電機株式会社 光学式情報再生装置
JP2618868B2 (ja) * 1986-10-31 1997-06-11 三菱電機株式会社 光学ヘツドユニット
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JPH02311816A (ja) * 1989-05-27 1990-12-27 Sharp Corp ビーム変換装置
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JP2684822B2 (ja) * 1990-06-06 1997-12-03 松下電器産業株式会社 光ピックアップヘッド装置
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US5245174A (en) * 1990-10-15 1993-09-14 Applied Magnetics Corporation Focus sensing apparatus utilizing a reflecting surface having variable reflectivity
JP2865223B2 (ja) * 1990-12-28 1999-03-08 松下電子工業株式会社 光ピックアップ用偏光板および光ピックアップ装置
US5751480A (en) * 1991-04-09 1998-05-12 Canon Kabushiki Kaisha Plate-like polarizing element, a polarizing conversion unit provided with the element, and a projector provided with the unit
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Also Published As

Publication number Publication date
ES8105876A1 (es) 1981-06-01
US4358200A (en) 1982-11-09
NL7907216A (nl) 1981-03-31
JPH028379B2 (it) 1990-02-23
ES495326A0 (es) 1981-06-01
DE3035719A1 (de) 1981-04-09
GB2059057B (en) 1983-09-21
DE3035719C2 (it) 1989-03-09
CA1144792A (en) 1983-04-19
FR2466787B1 (fr) 1986-03-28
GB2059057A (en) 1981-04-15
JPS5657013A (en) 1981-05-19
AU6270980A (en) 1981-04-09
IT1132757B (it) 1986-07-02
FR2466787A1 (fr) 1981-04-10

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