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Machine translation
1. (WO1981003229) DEVICE ALLOWING A VIBRATION-FREE RETRACTION OF THE MIRROR OF A PHOTOGRAPHIC REFLEX CAMERA FROM THE VIEW FINDING POSITION TO THE SHOT TAKING POSITION
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/003229    International Application No.:    PCT/EP1981/000034
Publication Date: 12.11.1981 International Filing Date: 29.04.1981
IPC:
G03B 19/12 (2006.01)
Applicants:
Inventors:
Priority Data:
3106622 23.02.1981 DE
Title (EN) DEVICE ALLOWING A VIBRATION-FREE RETRACTION OF THE MIRROR OF A PHOTOGRAPHIC REFLEX CAMERA FROM THE VIEW FINDING POSITION TO THE SHOT TAKING POSITION
(FR) DISPOSITIF POUR PERMETTRE UN ESCAMOTAGE EXEMPT DE VIBRATIONS DU MIROIR D"UN APPAREIL PHOTOGRAPHIQUE REFLEX DE LA POSITION DE VISEE A LA POSITION DE PRISE DE VUES
Abstract: front page image
(EN)In single-lens reflex cameras a movable minor (1) is disposed between the lens (13) and the film (14). This minor deflects, in a view finding position (1), the light rays onto a focusing screen (15) viewfinder and can be retracted by tilting into a shot taking position (1"). This must be done so as to avoid a fuzzy image caused by the shock of the minor against the camera frame. A retraction of the mirror free from vibrations is obtained by accelerating it with the help of a torque spring (4) which is placed between the minor (1) and a movable balancing mass (2) added to the mirror and braking it by means of a brake (21, 22, 23) disposed on the movable parts. The minor position at every moment of its displacement is determined by cogwheels (16, 17, 18, 19) linked to the minor, to the balancing mass, respectively to a supplementary pin (20). Through the rotation of the pin (20) the minor can be disposed into a view finding position after the taking of photographs and be held in this position by locking this axis. The unlocking allows the minor to tilt into the view finding position. The unbalance resulting from the displacement of the minor and the balancing mass can be reduced by providing some counterweights (11, 12) or by disposing the masses of the minor and of the balancing mass symmetrically with respect to the rotation axis at the centre of the displacement. A corresponding disposition for the minor with a virtual mirror with a virtual rotation axis (for instance a pivoting mirror) is also described.
(FR)Dans les appareils reflex a un objectif un miroir mobile (1) est dispose entre l"objectif (13) et le film (14). Ce miroir devie, dans une position de visee (1) les rayons lumineux sur un viseur a verre depoli (15) et peut etre escamote en basculant dans une position de prise de vues (1"). Ceci doit etre effectue de maniere a eviter un flou de l"image du au choc du miroir contre le bati de l"appareil. Un escamotage du miroir exempt de vibrations est obtenu en l"accelerant a l"aide d"un ressort de torsion (4) qui est place entre le miroir (1) et une masse mobile (2) d"equilibre qui lui est adjointe et en freinant a l"aide d"un frein (21, 22, 23) dispose sur les parties mobiles. La position du miroir a chaque instant de son deplacement est determinee par des roues dentees (16, 17, 18, 19) reliees au miroir, a la masse d"equilibrage, respectivement a un axe supplementaire (20). Par rotation de l"axe (20) le miroir peut etre escamote en position de visee apres la prise de vue et maintenu dans cette position par blocage de cet axe. Le deblocage permet au miroir de basculer dans la position de prise de vue. Le balourd resultant du mouvement du miroir et de la masse d"equilibrage peut etre reduit en prevoyant des contrepoids (11, 12) ou en disposant les masses du miroir et de la masse d"equilibrage symetriquement par rapport a l"axe de rotation au centre du deplacement. En outre, une disposition correspondante pour le miroir avec axe de rotation virtuel (par exemple miroir pivotant) est indiquee.
Designated States:
Publication Language: German (DE)
Filing Language: German (DE)