Classifications

• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—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
  • G03B9/00—Exposure-making shutters; Diaphragms
  • G03B9/08—Shutters
• • G—PHYSICS
  • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
  • G03B—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
  • G03B9/00—Exposure-making shutters; Diaphragms
  • G03B9/08—Shutters
  • G03B9/10—Blade or disc rotating or pivoting about axis normal to its plane
  • G03B9/18—More than two members
  • G03B9/22—More than two members each moving in one direction to open and then in opposite direction to close, e.g. iris type

Definitions

• the invention relates to a central closure for camera lenses with an annular, the closure opening encompassing plate carrier, are arranged on the at least two circularly symmetrical stationary pins, on which crescent-shaped shutter blades are pivotally mounted, and with a the shutter blades on the shutter opening pivoting motor drive.
• a self-tensioning central shutter for photographic purposes in which a base plate includes a central light passage opening.
• two shutter blades are pivotally mounted about diametrically opposed stationary pins.
• a blade actuating part is provided, which is designed as a drive ring.
• the drive ring is pivotally mounted about a surrounding the light passage opening flange of the base plate. He has diametrically opposite arms which engage with firmly seated in them bolts in slots in the shutter blades. The slots extend radially to the pins about which the shutter blades are pivotable.
• the bolts are guided in arcuate slots in the base plate.
• a lever mechanism For pivoting the drive ring is a lever mechanism having a drive lever.
• the drive lever is pivotally mounted about an axis of rotation seated in the base plate and loaded by a tension spring.
• the drive lever forms together with a rocker arm a pair of toggle levers.
• the rocker arm is pivotally hinged to the drive ring. Coupled to the drive lever are a manually operated clamping and release lever.
• a photographic central closure in which a plurality of bolts are arranged as a pivot bearing for the shutter blades on a disk support ring distributed in a circular symmetry.
• the shutter blades each contain a radially spaced from the pivot bearing hole, in each of which engages a mounted on a drive ring bolt.
• the drive ring can be moved back and forth, whereby the shutter blades are moved into and out of the shutter opening.
• the motor and a battery for power generation are arranged in the camera body and coupled in a gear with the central closure.
• the forces acting on the drive holes during the acceleration of the shutter blades are large and lead to early wear and relatively loud noises.
• the invention therefore an object of the invention to reduce the component cost and thus to reduce the space, to reduce the power consumption of the drive motors and at the same time further reduce the short opening times.
• the power transmission when pivoting the shutter blades should be wear, noise and vibration.
• the central lock should be used with its electric motor drives as a compact assembly in interchangeable lenses for photographic cameras.
• the essence of the invention consists in the division of the drive for pivoting the shutter blades.
• the motor-rotatable elevator ring can be driven with a low power motor steadily and independently of the movement of the shutter blades. Due to the rotation of the elevator ring, the tension spring suspended between the two elements can be tensioned when the cam ring is blocked. The energy stored in the springs then serves subsequently after release of the cam ring for pivoting the coupled with the cam ring shutter blades.
• the low electrical current required to drive the motor can be safely transferred from a battery housed in the camera body via contacts in the Anriegelebene the interchangeable lens. At higher currents for strong motors with fast start-up times there is a risk that the contacts may get hot and be damaged if the contact points are faulty.
• the winding ring is expediently designed as a gear with attached to the outer circumference sprocket. This can be brought via a suitable gear with the engine engaged.
• the sawtooth-shaped cam on the cam ring are formed so that the direction of the tension direction of the tension springs front edge is the steeper.
• Disk carrier is pivotally mounted on the disk carrier at least one pawl, which can be incident between the cams and come to rest on a front edge of the cam.
• the pawl is to be positioned so that it holds in engagement with the cam ring coupled shutter blades in a position closing the shutter opening and / or in a pivoted out of the closed position position when applied to a front edge of a cam.
• Shutters provided.
• the pivoting movement of the one or more pawls is controlled by a motor.
• the coupling of the shutter blades to the cam ring is that the shutter blades are connected to a spring-biased pivot lever so that this upon rotation of the cam ring by a front edge of a cam against the spring bias the
• a release latch is positioned so that it holds the shutter blades in the closed position in the closed position.
• Retaining latch is positioned so that it holds in the pivoted state, the pivot lever in the support on a cam head and thus the shutter blades in the open position.
• Fig. 3 the slat side with partially swung-out shutter blades
• the annular disk carrier 1 shown in Figure 1 surrounds the closure opening 2.
• part of an elevator ring 3 is inserted into the plate carrier 1.
• the elevator ring 3 is formed as a flat annular disc, which at her outer circumference a ring gear 4 carries.
• the ring gear 4 is engaged with a motor gear 5, which is driven by an electric motor 6.
• a likewise formed as a flat annular disc cam ring 7 is rotatably mounted.
• cam ring 7 Only a web-shaped ring 8 is visible in this illustration, in which a tension spring 9 is mounted. With its other end, the tension spring 9 is mounted in the elevator ring 3.
• the web-shaped ring 8 After blocking the rotation of the cam ring 7 moves when tensioning the tension spring 9 in the direction shown by an arrow, the web-shaped ring 8 in a circular segment-shaped cutout 10 in the elevator ring.
• a release latch 21 and a holding pawl 22 are also pivotally mounted on the plate carrier 1 .
• the pivot position of the pawls 21, 22 can be changed by the servomotors 11, 12 by motor.
• the release latch 21 abuts a front edge 18 of a cam 17 and thus blocks the rotation of the cam ring 7.
• the holding pawl 22 rests on a cam head 20 and can when releasing the rotation of the cam ring 7 in the subsequent space between successive cam 17 are pivoted.
• the pivot levers 15 abut each other on a front arm 18 of a cam 17 and are thereby coupled to the cam ring 7.
• the retaining pawl 22 has fallen between two cams 17 and is located on a front edge 18 of a cam 17 at.
• the holding pawl 22 is positioned and dimensioned so that in the illustrated position at the same time the pivot lever 15 rest on a cam head 20. This is the position in which the shutter blades 14 are completely pivoted out of the shutter opening 2.

Landscapes

• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Shutters For Cameras (AREA)

Priority Applications (4)

Applications Claiming Priority (4)

Publications (1)

Family

ID=42317585

Family Applications (1)

Country Status (6)

Cited By (1)

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Citations (5)

Family Cites Families (9)

• 2009
  • 2009-06-15 DE DE102009025320A patent/DE102009025320A1/de not_active Withdrawn
• 2010
  • 2010-02-02 EP EP10703010.8A patent/EP2394197B1/de not_active Not-in-force
  • 2010-02-02 DK DK10703010.8T patent/DK2394197T3/da active
  • 2010-02-02 US US13/147,852 patent/US8511918B2/en not_active Expired - Fee Related
  • 2010-02-02 WO PCT/EP2010/000605 patent/WO2010089075A1/de not_active Ceased
  • 2010-02-02 JP JP2011548586A patent/JP5520319B2/ja active Active

Patent Citations (5)

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