Sound-damping lens adapter for a motion-picture camera

Details Sound-damping lens adapter for a motion-picture camera Sound-damping lens adapter for a motion-picture camera

1987-12-21

1991-08-06

Hayes, Monroe H.

Optics: motion pictures

With sound accompaniment

Housing and supports

352231, G03B 3100

Patent

active

050371959

ABSTRACT:
This adapter is interchangeable with standard nondamping lens-mounting adapters. It reduces the amount of vibration that is transmitted from the camera mechanism to the lens. It thereby reduces the amount of vibration that is retransmitted as objectionable background sound, by radiation from the lens, into a sound stage or other scene area. A vibration-absorbing resilient ring is securely fixed to two substantially rigid rings. A camera mount is secured to one of the rigid rings, for mounting to a camera in a normal position for mounting a standard adapter. A lens attachment is secured to the other rigid ring, for attachment to a lens in a normal position (on the lens) for attaching a standard adapter. The camera mount and the lens attachment both have respective standard-configuration portions, which are spaced apart by a distance that is precisely equal to a standard distance between the respective corresponding portions of a standard adapter. Hence the resilient ring absorbs a fraction of the objectionable noise vibration, deterring that fraction from being transmitted to and radiated from the lens into the scene area--but does so while maintaining a standard distance between the lens and the camera focal plane, and without modification of either the lens or the camera.

REFERENCES:
patent: 4013352 (1977-03-01), Monroy
patent: 4121886 (1978-10-01), Gottschalk
patent: 4536066 (1985-08-01), Bauer
patent: 4816857 (1989-03-01), Blascher

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