CA1073255A - Symmetrical astigmatic focus sensing system - Google Patents
Symmetrical astigmatic focus sensing systemInfo
- Publication number
- CA1073255A CA1073255A CA268,953A CA268953A CA1073255A CA 1073255 A CA1073255 A CA 1073255A CA 268953 A CA268953 A CA 268953A CA 1073255 A CA1073255 A CA 1073255A
- Authority
- CA
- Canada
- Prior art keywords
- reading
- track
- path
- spot
- light
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired
Links
- 230000003287 optical effect Effects 0.000 claims abstract description 33
- 238000006073 displacement reaction Methods 0.000 claims abstract description 17
- 108091008695 photoreceptors Proteins 0.000 claims abstract description 10
- 230000001427 coherent effect Effects 0.000 claims abstract description 8
- 238000000926 separation method Methods 0.000 claims abstract description 8
- 238000012937 correction Methods 0.000 claims description 19
- 239000000543 intermediate Substances 0.000 claims 2
- 241000711981 Sais Species 0.000 claims 1
- 230000006870 function Effects 0.000 description 3
- 238000013459 approach Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 206010041662 Splinter Diseases 0.000 description 1
- OMFRMAHOUUJSGP-IRHGGOMRSA-N bifenthrin Chemical compound C1=CC=C(C=2C=CC=CC=2)C(C)=C1COC(=O)[C@@H]1[C@H](\C=C(/Cl)C(F)(F)F)C1(C)C OMFRMAHOUUJSGP-IRHGGOMRSA-N 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229920000136 polysorbate Polymers 0.000 description 1
- 239000003381 stabilizer Substances 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
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
Landscapes
- Optical Recording Or Reproduction (AREA)
- Automatic Focus Adjustment (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US05/645,490 US4025949A (en) | 1975-12-31 | 1975-12-31 | Symmetrical astigmatic focus sensing system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1073255A true CA1073255A (en) | 1980-03-11 |
Family
ID=24589236
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA268,953A Expired CA1073255A (en) | 1975-12-31 | 1976-12-30 | Symmetrical astigmatic focus sensing system |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US4025949A (OSRAM) |
| JP (1) | JPS608535B2 (OSRAM) |
| CA (1) | CA1073255A (OSRAM) |
| DE (1) | DE2659618C2 (OSRAM) |
| FR (1) | FR2337473A1 (OSRAM) |
| GB (1) | GB1573021A (OSRAM) |
| IT (1) | IT1065693B (OSRAM) |
Families Citing this family (28)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2325987A1 (fr) * | 1975-09-29 | 1977-04-22 | Thomson Brandt | Dispositif de lecture optique d'un enregistrement |
| JPS5266405A (en) * | 1975-11-29 | 1977-06-01 | Victor Co Of Japan Ltd | Optical recording system of information recording discs |
| GB1532345A (en) * | 1976-06-25 | 1978-11-15 | Hitachi Ltd | Information play-back apparatus |
| NL7703077A (nl) * | 1977-03-22 | 1978-09-26 | Philips Nv | Inrichting voor het uitlezen van een stralings- reflekterende registratiedrager. |
| CA1131361A (en) * | 1977-05-11 | 1982-09-07 | Fumitaka Kotaka | Focus servo device for use in optical read-out device of information |
| US4223348A (en) * | 1977-09-12 | 1980-09-16 | Olympus Optical Co., Ltd. | Automatic focussing device |
| JPS54155832A (en) * | 1978-05-30 | 1979-12-08 | Canon Inc | Focusing detector |
| JPS55927A (en) * | 1978-06-16 | 1980-01-07 | Pioneer Video Corp | Focus servo unit of optical information reader |
| JPS6038771B2 (ja) * | 1978-06-19 | 1985-09-03 | パイオニア株式会社 | 光学式情報読取装置のサ−ボ装置 |
| NL7907216A (nl) * | 1979-09-28 | 1981-03-31 | Philips Nv | Optisch fokusfout-detektiestelsel. |
| NL8004892A (nl) * | 1980-08-29 | 1982-04-01 | Philips Nv | Inrichting voor het verwerken van optische informatie en werkwijze voor het vervaardigen van een coma-correctieplaat zoals toegepast in een dergelijke inrichting. |
| JPS5744236A (en) * | 1980-08-29 | 1982-03-12 | Matsushita Electric Ind Co Ltd | Optical information reproducer |
| JPS5774837A (en) * | 1980-10-25 | 1982-05-11 | Olympus Optical Co Ltd | Signal detection system of optical information reproducing device |
| FR2498341A1 (fr) * | 1981-01-20 | 1982-07-23 | Thomson Csf | Dispositif optique detecteur d'ecart de focalisation et enregistreur lecteur optique comportant un tel dispositif |
| FR2502800A1 (fr) * | 1981-03-24 | 1982-10-01 | Thomson Csf | Senseur optique d'asservissement de focalisation |
| US4458144A (en) * | 1981-06-30 | 1984-07-03 | Storage Technology Corporation | Apparatus for reading information stored in a track pattern on a radiation reflecting record |
| NL8105579A (nl) * | 1981-12-11 | 1983-07-01 | Philips Nv | Optisch fokusfoutdetektiestelsel. |
| JPS58220250A (ja) * | 1982-06-16 | 1983-12-21 | Ricoh Co Ltd | 自動焦点合せ光学系 |
| JPS58193335U (ja) * | 1982-06-17 | 1983-12-22 | パイオニア株式会社 | フオ−カスエラ−検出装置 |
| FR2536568A1 (fr) * | 1982-11-18 | 1984-05-25 | Sony Corp | Appareil de detection de la position d'un lecteur optique |
| JPS6077022U (ja) * | 1983-11-01 | 1985-05-29 | パイオニア株式会社 | 焦点誤差検出装置 |
| DE3340009A1 (de) * | 1983-11-04 | 1985-05-15 | Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V., 3400 Göttingen | Verfahren und einrichtung zum ermitteln des fokussierungszustandes eines abbildenden teilchenoptischen geraetes |
| JPS60185230A (ja) * | 1984-03-02 | 1985-09-20 | Pioneer Electronic Corp | 焦点誤差検出装置 |
| US4799210A (en) * | 1986-11-05 | 1989-01-17 | Unisys Corporation | Fiber optic read/write head for an optical disk memory system |
| US5353272A (en) * | 1992-12-29 | 1994-10-04 | Eastman Kodak Company | Apparatus and method for a modified half-aperture focus/tracking/data sensor system |
| DE19726581C5 (de) * | 1997-06-23 | 2010-02-04 | Sick Ag | Verfahren zur Bestimmung der Fokuslage einer optoelektronischen Vorrichtung |
| DE102009049167A1 (de) * | 2009-10-12 | 2011-05-05 | Imos Gubela Gmbh | Sicherheitslupe zur Vergrößerung und zur Vermeidung des Brennglaseffektes |
| US10001622B2 (en) * | 2011-10-25 | 2018-06-19 | Sanford Burnham Medical Research Institute | Multifunction autofocus system and method for automated microscopy |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3596101A (en) * | 1969-11-05 | 1971-07-27 | Canon Kk | Optical systems for automatic focusing apparatus |
| FR2266932B1 (OSRAM) * | 1973-03-02 | 1977-09-02 | Thomson Brandt | |
| JPS5016423A (OSRAM) * | 1973-06-11 | 1975-02-21 | ||
| FR2235448B1 (OSRAM) * | 1973-06-29 | 1976-05-07 | Thomson Brandt | |
| FR2271590B1 (OSRAM) * | 1974-01-15 | 1978-12-01 | Thomson Brandt | |
| NL7414776A (nl) * | 1974-11-13 | 1976-05-17 | Philips Nv | Inrichting voor het uitlezen van een registra- tiedrager met een optische informatiestruktuur. |
| US3983317A (en) * | 1974-12-09 | 1976-09-28 | Teletype Corporation | Astigmatizer for laser recording and reproducing system |
-
1975
- 1975-12-31 US US05/645,490 patent/US4025949A/en not_active Expired - Lifetime
-
1976
- 1976-12-10 FR FR7637334A patent/FR2337473A1/fr active Granted
- 1976-12-27 JP JP51160945A patent/JPS608535B2/ja not_active Expired
- 1976-12-28 IT IT30904/76A patent/IT1065693B/it active
- 1976-12-29 GB GB54205/76A patent/GB1573021A/en not_active Expired
- 1976-12-30 CA CA268,953A patent/CA1073255A/en not_active Expired
- 1976-12-30 DE DE2659618A patent/DE2659618C2/de not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US4025949A (en) | 1977-05-24 |
| FR2337473A1 (fr) | 1977-07-29 |
| JPS608535B2 (ja) | 1985-03-04 |
| DE2659618C2 (de) | 1986-08-28 |
| GB1573021A (en) | 1980-08-13 |
| FR2337473B1 (OSRAM) | 1980-08-29 |
| IT1065693B (it) | 1985-03-04 |
| JPS5285801A (en) | 1977-07-16 |
| DE2659618A1 (de) | 1977-07-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |