FTHETA LENS
PROBLEM TO BE SOLVED: To obtain fθ lens which is composed of three elements, has a good telecentric characteristic, is well corrected of aberrations and has a good fθ characteristic by forming the fθ lens composed of the three elements in three groups so as to satisfy specific conditions. SOLUTION:...
Saved in:
Main Authors | , |
---|---|
Format | Patent |
Language | English |
Published |
10.03.1998
|
Edition | 6 |
Subjects | |
Online Access | Get full text |
Cover
Loading…
Abstract | PROBLEM TO BE SOLVED: To obtain fθ lens which is composed of three elements, has a good telecentric characteristic, is well corrected of aberrations and has a good fθ characteristic by forming the fθ lens composed of the three elements in three groups so as to satisfy specific conditions. SOLUTION: This fθ lens is composed of the lens group composed of the three elements in three groups consisting, successively from an object side toward an image plane side, a first lens 1 of a negative meniscus lens of which the concave face is directed to the object side, a second lens 2 of a positive meniscus lens of which the concave face is directed toward the object side and a third lens 3 of a positive meniscus lens of which the convex face is directed toward the object side. The lens is so formed as to satisfy the conditions -0.9<f1 /f<-0.4, d2 /f<0.06, N1 , N2 , N3 >2, -1.2<r1 /d0 <-0.8 by defining the focal length of the entire system as f, the refractive indices of the first lens 1 to the third lens 3 as N1 to N3 , the distance from the deflection plane of a deflector to the first lens 1 as d0 , the air spacing between the first and second lenses 1, 2 as d2 and the radius of curvature of the incident surface of the first lens 1 as r1 . |
---|---|
AbstractList | PROBLEM TO BE SOLVED: To obtain fθ lens which is composed of three elements, has a good telecentric characteristic, is well corrected of aberrations and has a good fθ characteristic by forming the fθ lens composed of the three elements in three groups so as to satisfy specific conditions. SOLUTION: This fθ lens is composed of the lens group composed of the three elements in three groups consisting, successively from an object side toward an image plane side, a first lens 1 of a negative meniscus lens of which the concave face is directed to the object side, a second lens 2 of a positive meniscus lens of which the concave face is directed toward the object side and a third lens 3 of a positive meniscus lens of which the convex face is directed toward the object side. The lens is so formed as to satisfy the conditions -0.9<f1 /f<-0.4, d2 /f<0.06, N1 , N2 , N3 >2, -1.2<r1 /d0 <-0.8 by defining the focal length of the entire system as f, the refractive indices of the first lens 1 to the third lens 3 as N1 to N3 , the distance from the deflection plane of a deflector to the first lens 1 as d0 , the air spacing between the first and second lenses 1, 2 as d2 and the radius of curvature of the incident surface of the first lens 1 as r1 . |
Author | MOCHIDA YOSHIO UENO KAZUO |
Author_xml | – fullname: UENO KAZUO – fullname: MOCHIDA YOSHIO |
BookMark | eNrjYmDJy89L5WTgdgvxcA1xVPBx9QvmYWBNS8wpTuWF0twMCm6uIc4euqkF-fGpxQWJyal5qSXxXgEehgZmFhbmZo7GRCgBAPDMHaY |
ContentType | Patent |
DBID | EVB |
DatabaseName | esp@cenet |
DatabaseTitleList | |
Database_xml | – sequence: 1 dbid: EVB name: esp@cenet url: http://worldwide.espacenet.com/singleLineSearch?locale=en_EP sourceTypes: Open Access Repository |
DeliveryMethod | fulltext_linktorsrc |
Discipline | Medicine Chemistry Sciences Physics |
Edition | 6 |
ExternalDocumentID | JPH1068876A |
GroupedDBID | EVB |
ID | FETCH-epo_espacenet_JPH1068876A3 |
IEDL.DBID | EVB |
IngestDate | Fri Jul 19 12:00:37 EDT 2024 |
IsOpenAccess | true |
IsPeerReviewed | false |
IsScholarly | false |
Language | English |
LinkModel | DirectLink |
MergedId | FETCHMERGED-epo_espacenet_JPH1068876A3 |
Notes | Application Number: JP19960227929 |
OpenAccessLink | https://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19980310&DB=EPODOC&CC=JP&NR=H1068876A |
ParticipantIDs | epo_espacenet_JPH1068876A |
PublicationCentury | 1900 |
PublicationDate | 19980310 |
PublicationDateYYYYMMDD | 1998-03-10 |
PublicationDate_xml | – month: 03 year: 1998 text: 19980310 day: 10 |
PublicationDecade | 1990 |
PublicationYear | 1998 |
RelatedCompanies | MATSUSHITA ELECTRIC IND CO LTD |
RelatedCompanies_xml | – name: MATSUSHITA ELECTRIC IND CO LTD |
Score | 2.475927 |
Snippet | PROBLEM TO BE SOLVED: To obtain fθ lens which is composed of three elements, has a good telecentric characteristic, is well corrected of aberrations and has a... |
SourceID | epo |
SourceType | Open Access Repository |
SubjectTerms | OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICS PHYSICS |
Title | FTHETA LENS |
URI | https://worldwide.espacenet.com/publicationDetails/biblio?FT=D&date=19980310&DB=EPODOC&locale=&CC=JP&NR=H1068876A |
hasFullText | 1 |
inHoldings | 1 |
isFullTextHit | |
isPrint | |
link | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwY2BQAR1yl2aZkqKblGaYpGsCOr01ydIgUdcs1SQ1MS3ZwtLMBLR32NfPzCPUxCvCNIKJIRO2FwZ8Tmg5-HBEYI5KBub3EnB5XYAYxHIBr60s1k_KBArl27uF2LqopcC2i4FOulRzcbJ1DfB38XdWc3a29QpQ8wuy9TAE3a5ibubIzMAKakWDjtl3DXMCbUopQK5R3AQZ2AKAhuWVCDEwpeYJM3A6wy5eE2bg8IXOdwszsIMXaCYXAwWhmbBYhIHbLcTDNcRRwcfVL1iUQcHNNcTZQxdofjzcL_FeAXCXGIsxsAC7-KkSDAppoIZIknmiQVqiqUkSsIYAqjADZr5kYGse1KKSZJDEaYwUHjlpBi7YHjpDAxkGlpKi0lRZYCVakiQH9j4A97JzJw |
link.rule.ids | 230,309,786,891,25594,76906 |
linkProvider | European Patent Office |
linkToHtml | http://utb.summon.serialssolutions.com/2.0.0/link/0/eLvHCXMwY2BQAR1yl2aZkqKblGaYpGsCOr01ydIgUdcs1SQ1MS3ZwtLMBLR32NfPzCPUxCvCNIKJIRO2FwZ8Tmg5-HBEYI5KBub3EnB5XYAYxHIBr60s1k_KBArl27uF2LqopcC2i4FOulRzcbJ1DfB38XdWc3a29QpQ8wuy9TAE3a5ibubIzMBqDjqcF9RyCnMCbUopQK5R3AQZ2AKAhuWVCDEwpeYJM3A6wy5eE2bg8IXOdwszsIMXaCYXAwWhmbBYhIHbLcTDNcRRwcfVL1iUQcHNNcTZQxdofjzcL_FeAXCXGIsxsAC7-KkSDAppoIZIknmiQVqiqUkSsIYAqjADZr5kYGse1KKSZJDEaYwUHjl5Bk6PEF-feB9PP29pBi7YfjpDAxkGlpKi0lRZYIVakiQHDgoAgT52FA |
openUrl | ctx_ver=Z39.88-2004&ctx_enc=info%3Aofi%2Fenc%3AUTF-8&rfr_id=info%3Asid%2Fsummon.serialssolutions.com&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Apatent&rft.title=FTHETA+LENS&rft.inventor=UENO+KAZUO&rft.inventor=MOCHIDA+YOSHIO&rft.date=1998-03-10&rft.externalDBID=A&rft.externalDocID=JPH1068876A |