FR2335861A1 - Focussing system comprising single mobile lens - has projection system with field lens, mirror and objective - Google Patents

Focussing system comprising single mobile lens - has projection system with field lens, mirror and objective

Info

Publication number
FR2335861A1
FR2335861A1 FR7538495A FR7538495A FR2335861A1 FR 2335861 A1 FR2335861 A1 FR 2335861A1 FR 7538495 A FR7538495 A FR 7538495A FR 7538495 A FR7538495 A FR 7538495A FR 2335861 A1 FR2335861 A1 FR 2335861A1
Authority
FR
France
Prior art keywords
lens
projection system
point
objective
mirror
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.)
Granted
Application number
FR7538495A
Other languages
French (fr)
Other versions
FR2335861B1 (en
Inventor
Claude Puech
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Thomson-Brandt SA
Original Assignee
Thomson-Brandt SA
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 Thomson-Brandt SA filed Critical Thomson-Brandt SA
Priority to FR7538495A priority Critical patent/FR2335861A1/en
Publication of FR2335861A1 publication Critical patent/FR2335861A1/en
Application granted granted Critical
Publication of FR2335861B1 publication Critical patent/FR2335861B1/fr
Granted legal-status Critical Current

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

Abstract

The optical system can focus a beam of radiated energy from a primary source (101) at a point (P2) of an object (111). It comprises a simple single lens (102) which is movable and which forms a mobile point (P1) of radiant energy of minimal dimensions. This point forms a secondary source of radiant energy for a projection system (105, 106, 107), thus enabling the image of the secondary source to be formed on the object. The projection system has a fixed conveyance. Since the beam from the primary source is parallel and monochromatic, and arrives at the lens parallel to its axis the lens is constructed so that it corrects spherical aberation for its principal focus. The projection system comprises a field lens (103) which reduces the divergence of the incident beam from the secondary source (P1), a mobile mirror (106) which deflects the beam afer it has passed through the field lens (103) and an objective (107) which focusses the deflected beam onto a point (P2) of an object (111). The transverse magnification of the projection system is 20 or more.
FR7538495A 1975-12-16 1975-12-16 Focussing system comprising single mobile lens - has projection system with field lens, mirror and objective Granted FR2335861A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7538495A FR2335861A1 (en) 1975-12-16 1975-12-16 Focussing system comprising single mobile lens - has projection system with field lens, mirror and objective

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7538495A FR2335861A1 (en) 1975-12-16 1975-12-16 Focussing system comprising single mobile lens - has projection system with field lens, mirror and objective

Publications (2)

Publication Number Publication Date
FR2335861A1 true FR2335861A1 (en) 1977-07-15
FR2335861B1 FR2335861B1 (en) 1978-08-18

Family

ID=9163795

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7538495A Granted FR2335861A1 (en) 1975-12-16 1975-12-16 Focussing system comprising single mobile lens - has projection system with field lens, mirror and objective

Country Status (1)

Country Link
FR (1) FR2335861A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188276A1 (en) * 1985-01-16 1986-07-23 Hewlett-Packard Company Actuator apparatus for an optical data storage device
EP0213561A1 (en) * 1985-08-27 1987-03-11 Siemens Aktiengesellschaft Positioning device for an optical-disc memory

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2251876A1 (en) * 1973-11-16 1975-06-13 Thomson Brandt

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2251876A1 (en) * 1973-11-16 1975-06-13 Thomson Brandt

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0188276A1 (en) * 1985-01-16 1986-07-23 Hewlett-Packard Company Actuator apparatus for an optical data storage device
EP0213561A1 (en) * 1985-08-27 1987-03-11 Siemens Aktiengesellschaft Positioning device for an optical-disc memory
US4768179A (en) * 1985-08-27 1988-08-30 Siemens Aktiengesellschaft Optical disc store scanning device with a plurality of scanning units

Also Published As

Publication number Publication date
FR2335861B1 (en) 1978-08-18

Similar Documents

Publication Publication Date Title
US3974507A (en) Conversion of stripe-geometry junction laser emission to a spherical wavefront
JPS54143661A (en) Recording optical system
GB1171445A (en) Improvements in and relating to the Correction of Optical Systems
GR3003610T3 (en)
KR970703540A (en) Optical beam-splitting element
JPH0421845B2 (en)
JPS5246813A (en) Photographic optical system for observation for ophthalmofunduscopic c amera
FR2335861A1 (en) Focussing system comprising single mobile lens - has projection system with field lens, mirror and objective
DE69630997T2 (en) Autofocus device
JPS5667822A (en) Focal diaphragm
JPS547927A (en) Photographic lens of excellent focusing operation
JPH0439647B2 (en)
SU1048445A1 (en) Optical system having discrete focal length changing capability
EP0378149A3 (en) Achromatic-type laser scanning optical system
SU1661567A1 (en) Method of testing surfaces of optical parts
JPS54133105A (en) Optical disposition in disc reader
JPS54106206A (en) Optical recorder
IT1256798B (en) Optical exposure system for processing a substrate by means of excimer laser
JPS55106414A (en) Aperture optical device of semiconductor laser beam
JPH04147108A (en) Image pickup device
JPS57122416A (en) Scanner correcting optical device
JPS54134605A (en) Method and appartus of controlling focus
SU387320A1 (en) WIDE COAR MIRROR OBJECTNV
SU1307426A1 (en) Catadioptric zoom lens
GB2079488A (en) Interferometer for the shape control of convex surfaces of optical parts

Legal Events

Date Code Title Description
ST Notification of lapse