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1. (WO1991009340) A LENS ATTACHMENT
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1991/009340 International Application No.: PCT/GB1990/001898
Publication Date: 27.06.1991 International Filing Date: 06.12.1990
IPC:
G02B 3/00 (2006.01) ,G03B 11/00 (2006.01) ,G03B 17/06 (2006.01)
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
3
Simple or compound lenses
G PHYSICS
03
PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
B
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
11
Filters or other obturators specially adapted for photographic purposes
G PHYSICS
03
PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
B
APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
17
Details of cameras or camera bodies; Accessories therefor
02
Bodies
06
with exposure meters or other indicators built into body but not connected to other camera members
Applicants:
HOUGHTON, John, Ernest [GB/GB]; GB
Inventors:
HOUGHTON, John, Ernest; GB
Agent:
H. L. COTTRELL & CO.; Kings Building South Church Side Hull North Humberside HU1 1RR, GB
Priority Data:
8927644.807.12.1989GB
9014934.506.07.1990GB
Title (EN) A LENS ATTACHMENT
(FR) LENTILLE ADAPTABLE
Abstract:
(EN) A meniscus lens (1) comprises a partially reflective coating on one face which reflects a portion of incident light and transmits the remainder adapted, in use, to be attached co-axially in front of the lens of a camera with the rear concave surface thereof facing the camera lens such that the subject of a photograph, when looking towards the camera, sees reflected in the meniscus lens an image which is in all essential respects identical to the image which would be seen in the camera view finder.
(FR) Lentille ménisque (1) recouverte, sur une face, d'un revêtement partiellement réfléchissant qui reflète une partie de la lumière incidente et transmet le reste. Cette lentille s'adapte coaxialement devant un objectif d'appareil photographique, sa surface arrière concave face à l'objectif. Ainsi, lorsque le sujet photographié regarde en direction de l'appareil, il voit reflétée dans la lentille ménisque une image identique en tous points essentiels à celle qu'il verrait dans le viseur de l'appareil.
Designated States: JP, US
European Patent Office (AT, BE, CH, DE, DK, ES, FR, GB, GR, IT, LU, NL, SE)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP0457881