About: Relay lens     Goto   Sponge   NotDistinct   Permalink

An Entity of Type : yago:Whole100003553, within Data Space : dbpedia.org associated with source document(s)
QRcode icon
http://dbpedia.org/describe/?url=http%3A%2F%2Fdbpedia.org%2Fresource%2FRelay_lens&graph=http%3A%2F%2Fdbpedia.org&graph=http%3A%2F%2Fdbpedia.org

In optics, a relay lens is a lens or a group of lenses that receives the image from the objective lens and relays it to the eyepiece. Relay lenses are found in refracting telescopes, endoscopes, and periscopes to optically manipulate the light path, extend the length of the whole optical system, and usually serve the purpose of inverting the image. They may be made of one or more conventional lenses or achromatic doublets, or a long cylindrical gradient-index of refraction lens (a GRIN lens).

AttributesValues
rdf:type
rdfs:label
  • Relay lens (en)
  • 中继透镜 (zh)
rdfs:comment
  • 中继透镜（relay lens）通常有两组镜片，安装在镜筒中组成，镜片可以是普通，也可以是。虽然名称叫做中继透镜，但它并不是透镜。两组镜片，至少有两个配对透镜或两个配对透镜组构成。 很多（比如望远镜）中需要转向系统，转向系统可分为棱镜式和透镜式。中继透镜就是一种透镜式转向系统，通常可以选择由两组双胶合球面透镜组成。 (zh)
  • In optics, a relay lens is a lens or a group of lenses that receives the image from the objective lens and relays it to the eyepiece. Relay lenses are found in refracting telescopes, endoscopes, and periscopes to optically manipulate the light path, extend the length of the whole optical system, and usually serve the purpose of inverting the image. They may be made of one or more conventional lenses or achromatic doublets, or a long cylindrical gradient-index of refraction lens (a GRIN lens). (en)
foaf:depiction
  • http://commons.wikimedia.org/wiki/Special:FilePath///i916.photobucket.com/albums/ad6/tamasflexoptics/optika/image1.png
  • http://commons.wikimedia.org/wiki/Special:FilePath///i916.photobucket.com/albums/ad6/tamasflexoptics/optika/image2-1.png
  • http://commons.wikimedia.org/wiki/Special:FilePath///i916.photobucket.com/albums/ad6/tamasflexoptics/optika/image2.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Image-erecting_system.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Imageinverting-2.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Imgageinverting-1.png
dcterms:subject
Wikipage page ID
Wikipage revision ID
Link from a Wikipage to another Wikipage
Link from a Wikipage to an external page
sameAs
dbp:wikiPageUsesTemplate
thumbnail
has abstract
  • In optics, a relay lens is a lens or a group of lenses that receives the image from the objective lens and relays it to the eyepiece. Relay lenses are found in refracting telescopes, endoscopes, and periscopes to optically manipulate the light path, extend the length of the whole optical system, and usually serve the purpose of inverting the image. They may be made of one or more conventional lenses or achromatic doublets, or a long cylindrical gradient-index of refraction lens (a GRIN lens). Relay lenses operate by producing intermediate planes of focus. For example, in a SLR camera the zoom lens produces an image plane where the image sensor or photographic film would usually go. If you place another lens with focal length f at the distance 2f from that image plane and then put an image sensor at 2f beyond that lens, that lens will relay the first image to the second image with 1:1 magnification (see thin lens formula showing that with object distance from the lens, the image distance from the lens is calculated to ). Ideally, this second image is the mirror image of the first image, so you could put an image sensor there and record the mirrored first image. If a longer distance is needed, this can be repeated. In practice, the lens will be an achromatic doublet. In modern optical telescopes and telescopic sights with a dual-focal plane design, the objective image is typically already inverted upon reaching the relay lenses, and thus needed to be inverted again back into an erect image (i.e. "erecting" the image) before passing to the eyepiece, so the viewer actually sees an upright target. The relay lens group is the optical component responsible for that re-inversion, and therefore sometimes collectively called the erector lenses. Also, for endoscope applications, where small tube diameter is desirable, most of the tube is filled with glass, with thin air gaps to allow for powered surfaces; because marginal ray angle is smaller at a given numerical aperture the higher the index of refraction, this allows the relay to have higher NA for a given diameter. These are known as Hopkins rod lenses. Karl Storz GmbH licensed the patent for the Hopkins relay lens and introduced endoscopes including such lenses in 1965. (en)
  • 中继透镜（relay lens）通常有两组镜片，安装在镜筒中组成，镜片可以是普通，也可以是。虽然名称叫做中继透镜，但它并不是透镜。两组镜片，至少有两个配对透镜或两个配对透镜组构成。 很多（比如望远镜）中需要转向系统，转向系统可分为棱镜式和透镜式。中继透镜就是一种透镜式转向系统，通常可以选择由两组双胶合球面透镜组成。 (zh)
prov:wasDerivedFrom
page length (characters) of wiki page
foaf:isPrimaryTopicOf
is Link from a Wikipage to another Wikipage of
is Wikipage redirect of
is foaf:primaryTopic of
Faceted Search & Find service v1.17_git139 as of Feb 29 2024


Alternative Linked Data Documents: ODE     Content Formats:   [cxml] [csv]     RDF   [text] [turtle] [ld+json] [rdf+json] [rdf+xml]     ODATA   [atom+xml] [odata+json]     Microdata   [microdata+json] [html]    About   
This material is Open Knowledge   W3C Semantic Web Technology [RDF Data] Valid XHTML + RDFa
OpenLink Virtuoso version 08.03.3330 as of Mar 19 2024, on Linux (x86_64-generic-linux-glibc212), Single-Server Edition (378 GB total memory, 50 GB memory in use)
Data on this page belongs to its respective rights holders.
Virtuoso Faceted Browser Copyright © 2009-2024 OpenLink Software