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US 4,577,944 AGranted
Lens mount with noise reducing means
AssigneeCarl-Zeiss-Stiftung
InventorsSiegfried Grosser, Christian Ludwig, Kurt Wallner, Karl Herzog, Eugen Bayerl
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AssigneeCarl-Zeiss-Stiftung
InventorsSiegfried Grosser, Christian Ludwig, Kurt Wallner, Karl Herzog, Eugen Bayerl
Estimating the term…
A lens mount, especially but not exclusively for use with motion picture cameras, with special means for preventing transmission of noise through the lens mount from operation of moving parts within the camera to a microphone located in front of the camera. A focusing lens mount has two mounting parts which are movable axially relative to each other, and with a small clearance space between these two parts. An annular groove is provided, extending circumferentially around a cylindrical portion of one of these mounting parts. In this groove is a sound damping or impeding element, resiliently pressed against a companion cylindrical surface on the other of the mounting parts, to block passage of sound through the clearance space between the two cylindrical parts. The sound damping element is made of material having good dry-sliding characteristics.
A camera lens mount having provision for impeding transmission of sound from within a camera through the mount to a point in front of the camera, comprising a first mounting part attached to a camera, a second mounting part movable with respect to the first mounting part for focusing, said second part carrying at least one optical component, a groove formed in one of said mounting parts in a direction transverse to the direction of movement of said second mounting part relative to said first mounting part, and a sound damping element of material having good dry-sliding properties seated in said groove and resiliently engaging the other of said mounting parts to impede transmission of sound in an axial direction along said lens mount.
A focusing lens mount comprising a first tubular mounting part adapted to be attached to a camera, said first part having a cylindrical inner surface throughout part of its length, a second tubular mounting part carrying an optical element and movable axially at least partly within said first part for focusing, said second part having a cylindrical outer surface located at least partly opposite said cylindrical inner surface of said first part, a groove extending circumferentially completely around the entire circumference of one of said cylindrical surfaces, an element having good dry-sliding properties mounted in said groove and extending around the entire circumferential extent of said groove, and means pressing said element resiliently against the other of said cylindrical surfaces throughout substantially the complete circumference thereof.
The method of reducing transmission of noise through a focusing lens mount from operating parts within a camera to a microphone located in front of the camera, which comprises the steps of:
Dependencies are inferred from the claim text.