GB218763A - Improvements in projection apparatus - Google Patents

Improvements in projection apparatus

Info

Publication number
GB218763A
GB218763A GB1044423A GB1044423A GB218763A GB 218763 A GB218763 A GB 218763A GB 1044423 A GB1044423 A GB 1044423A GB 1044423 A GB1044423 A GB 1044423A GB 218763 A GB218763 A GB 218763A
Authority
GB
United Kingdom
Prior art keywords
prism
lens
virtual images
kaleidoscopes
condenser
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
Application number
GB1044423A
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.)
HILGER Ltd ADAM
Original Assignee
HILGER Ltd ADAM
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 HILGER Ltd ADAM filed Critical HILGER Ltd ADAM
Priority to GB1044423A priority Critical patent/GB218763A/en
Publication of GB218763A publication Critical patent/GB218763A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/02—Viewing or reading apparatus
    • G02B27/08—Kaleidoscopes

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Projection Apparatus (AREA)

Abstract

218,763. Hilger, Ltd., A., and Twyman, F. April 17, 1923. Kaleidoscopes. - In projection kaleidoscopes wherein the light passes through a condenser c, a prism d the cross section of which is a regular polygon, and a projecting lens e, means are provided for illuminating the virtual images of the object to be projected. As shown, a prism b, similar in cross section to the prism d, is placed between the light source a and the condenser. The prism b forms virtual images f of the light source which are conjugate with the virtual images g of the centre of the projecting lens formed. by the prism d. Alternatively, other sources of light may be placed at the positions of the images f. A diaphragm may be placed in the plane of the image formed by the lens e, and the image limited thereby may be projected by a second lens on to the screen.
GB1044423A 1923-04-17 1923-04-17 Improvements in projection apparatus Expired GB218763A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1044423A GB218763A (en) 1923-04-17 1923-04-17 Improvements in projection apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1044423A GB218763A (en) 1923-04-17 1923-04-17 Improvements in projection apparatus

Publications (1)

Publication Number Publication Date
GB218763A true GB218763A (en) 1924-07-17

Family

ID=9967956

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1044423A Expired GB218763A (en) 1923-04-17 1923-04-17 Improvements in projection apparatus

Country Status (1)

Country Link
GB (1) GB218763A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113766218A (en) * 2021-09-14 2021-12-07 北京集创北方科技股份有限公司 Position detection method for optical lens, electronic device, and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113766218A (en) * 2021-09-14 2021-12-07 北京集创北方科技股份有限公司 Position detection method for optical lens, electronic device, and storage medium
CN113766218B (en) * 2021-09-14 2024-05-14 北京集创北方科技股份有限公司 Position detection method of optical lens, electronic device and storage medium

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