GB1516799A - Levels - Google Patents

Levels

Info

Publication number
GB1516799A
GB1516799A GB5287376A GB5287376A GB1516799A GB 1516799 A GB1516799 A GB 1516799A GB 5287376 A GB5287376 A GB 5287376A GB 5287376 A GB5287376 A GB 5287376A GB 1516799 A GB1516799 A GB 1516799A
Authority
GB
United Kingdom
Prior art keywords
reflectors
optical
self levelling
prism
dec
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
GB5287376A
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.)
EssilorLuxottica SA
Original Assignee
Essilor International Compagnie Generale dOptique 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 Essilor International Compagnie Generale dOptique SA filed Critical Essilor International Compagnie Generale dOptique SA
Priority to GB5287376A priority Critical patent/GB1516799A/en
Publication of GB1516799A publication Critical patent/GB1516799A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
    • G01C5/00—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels
    • G01C5/02—Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels involving automatic stabilisation of the line of sight
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B17/00—Systems with reflecting surfaces, with or without refracting elements
    • G02B17/02—Catoptric systems, e.g. image erecting and reversing system
    • G02B17/04—Catoptric systems, e.g. image erecting and reversing system using prisms only
    • 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
    • G02B27/64—Imaging systems using optical elements for stabilisation of the lateral and angular position of the image

Abstract

1516799 Self levelling optical instruments ESSILOR INTERNATIONAL (COMPAGNIE GENERALE D'OPTIQUE) 17 Dec 1976 [18 Dec 1975] 52873/76 Heading G2J [Also in Division G I ] In a self levelling optical sighting apparatus the objectives and eyepiece axes 11, 12 are both parallel and substantially horizontal; and a pendulum 6, 8, bears reflectors 5,10. The optical axis is directed to and returned from a non-pendulous prism 13 by reflectors 5, 10. The system of prisms 4, 13, 5 inverts the image both horizontally and vertically, while adjustment of the separation between reflectors 5, 10 and prism 13 alters the optical path and thereby allows focusing. The pendulous action provides the self levelling property.
GB5287376A 1976-12-17 1976-12-17 Levels Expired GB1516799A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB5287376A GB1516799A (en) 1976-12-17 1976-12-17 Levels

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB5287376A GB1516799A (en) 1976-12-17 1976-12-17 Levels

Publications (1)

Publication Number Publication Date
GB1516799A true GB1516799A (en) 1978-07-05

Family

ID=10465650

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5287376A Expired GB1516799A (en) 1976-12-17 1976-12-17 Levels

Country Status (1)

Country Link
GB (1) GB1516799A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015061A1 (en) * 1979-01-20 1980-09-03 Fuji Photo Optical Co., Ltd. Image stabilized optical system
GB2116745A (en) * 1982-03-17 1983-09-28 Magyar Optikai Muevek Level instrument with telescope
GB2126746A (en) * 1982-07-23 1984-03-28 Canon Kk Compensating for optical path length changes
GB2160995A (en) * 1984-06-30 1986-01-02 Francis Albert Shaw Innes Optical instrument stabiliser
US5280387A (en) * 1989-09-06 1994-01-18 Asahi Kogaku Kogyo Kabushiki Kaisha Image stabilizing apparatus
EP0809780A1 (en) * 1994-10-27 1997-12-03 Yishay Netzer Compact keplerian telescope
GB2329249A (en) * 1997-09-12 1999-03-17 Michael John Smith Laser levelling device

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0015061A1 (en) * 1979-01-20 1980-09-03 Fuji Photo Optical Co., Ltd. Image stabilized optical system
GB2116745A (en) * 1982-03-17 1983-09-28 Magyar Optikai Muevek Level instrument with telescope
GB2126746A (en) * 1982-07-23 1984-03-28 Canon Kk Compensating for optical path length changes
GB2160995A (en) * 1984-06-30 1986-01-02 Francis Albert Shaw Innes Optical instrument stabiliser
US5280387A (en) * 1989-09-06 1994-01-18 Asahi Kogaku Kogyo Kabushiki Kaisha Image stabilizing apparatus
US5461513A (en) * 1989-09-06 1995-10-24 Asahi Kogaku Kogyo Kabushiki Kaisha Image stabilizing apparatus
EP0809780A1 (en) * 1994-10-27 1997-12-03 Yishay Netzer Compact keplerian telescope
EP0809780A4 (en) * 1994-10-27 1998-10-07 Yishay Netzer Compact keplerian telescope
GB2329249A (en) * 1997-09-12 1999-03-17 Michael John Smith Laser levelling device
GB2329249B (en) * 1997-09-12 2002-03-20 Michael John Smith Levelling device

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Legal Events

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