GB1302915A - - Google Patents

Info

Publication number
GB1302915A
GB1302915A GB486770A GB486770A GB1302915A GB 1302915 A GB1302915 A GB 1302915A GB 486770 A GB486770 A GB 486770A GB 486770 A GB486770 A GB 486770A GB 1302915 A GB1302915 A GB 1302915A
Authority
GB
United Kingdom
Prior art keywords
photo
cathode
objective
light
field
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
GB486770A
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 filed Critical
Publication of GB1302915A publication Critical patent/GB1302915A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
    • G02B23/12—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices with means for image conversion or intensification

Landscapes

  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Telescopes (AREA)

Abstract

1302915 Periscopic viewing device; PHILIPS USFA NV 2 Feb 1970 [17 June 1969] 4867/70 Heading B7J [Also in Divisions G2 and H4] A periscope, useful for driving vehicles at night, for example, comprises an objective lens system 3 with a field of view of at least 50 degrees, an electron-optical image intensifier 4 having a substantially spherical photo-cathode receiving light from the objective 3, and an ocular 6 for viewing the fluorescent screen of the intensifier 4, and is characterized in that the mean image surface of objective 3 is substantially coincident with the photo-cathode and has a curvature substantially equal to that of the photo-cathode, the objective 3 also being provided with a field stop for intercepting part of the light derived from the edge of the field of view so as to attenuate light incident at 20 degrees to the optic axis by 50%. The ocular preferably has a magnification factor 12% greater for light from the edge of the fluorescent screen relative to that from the screen centre. The photo-cathode curvature and the electronoptical system may give an image reduction factor of between 2À2 and 4. Two periscopes may be placed side-by-side for binocular viewing.
GB486770A 1969-06-17 1970-02-02 Expired GB1302915A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6909188A NL6909188A (en) 1969-06-17 1969-06-17

Publications (1)

Publication Number Publication Date
GB1302915A true GB1302915A (en) 1973-01-10

Family

ID=19807214

Family Applications (1)

Application Number Title Priority Date Filing Date
GB486770A Expired GB1302915A (en) 1969-06-17 1970-02-02

Country Status (4)

Country Link
DE (1) DE2004341A1 (en)
FR (1) FR2064056B1 (en)
GB (1) GB1302915A (en)
NL (1) NL6909188A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126042A (en) * 1980-12-22 1984-03-14 Eltro Gmbh Direction finder system

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1442964A (en) * 1975-04-10 1976-07-21 Mullard Ltd Optical viewing devices

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2631490A (en) * 1938-06-28 1953-03-17 Sackville William Method for detecting invisible and nonradiating objects
DE1045567B (en) * 1957-10-16 1958-12-04 Askania Werke Ag Electron-optical image converter tube with curved photocathode and an upstream lens

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2126042A (en) * 1980-12-22 1984-03-14 Eltro Gmbh Direction finder system

Also Published As

Publication number Publication date
DE2004341A1 (en) 1970-12-23
NL6909188A (en) 1970-12-21
FR2064056B1 (en) 1974-05-03
FR2064056A1 (en) 1971-07-16

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee