# US 5,706,074 A · Motion picture camera > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,706,074 A - Document ID: US5706074A - Status: Granted - Kind: A - Application number: 08/562,672 - Filed: 1995-11-27 - Granted: 1998-01-06 - Earliest claimed: 1994-11-25 - Assignees: Arnold & Richter Cine Technik GmbH & Co. Betriebs KG - Inventors: Hanns Kohler; Michael Koppetz; Hans-Dieter Jacoby - Web page: https://patentgrep.com/patent/US5706074A ## CPC - G03B 17/10: Soundproof bodies - G03B 19/20: Reflex cameras - 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 (optical parts of such apparatus G02B; photosensitive materials or processes for photographic purposes G03C; apparatus for processing exposed photographic materials G03D) ## Abstract A motion picture camera with an inner camera which has a camera mechanism that generates noise, a camera housing which has a lens carrier on which a photographic lens is disposed in the optical axis of the motion picture camera, and a plurality of noise-insulating connection elements disposed between the inner camera and camera housing. At least one of the noise-insulating connection elements is disposed parallel to the optical axis of the motion picture camera and has a higher rigidity relative to lower-frequency forces and a lower rigidity relative to higher-frequency forces. ## Claims ### Claim 1 A motion picture camera comprising an inner camera, a camera mechanism that generates noise, a camera housing, a lens carrier attached to the camera housing, a photographic lens mounted on the lens carrier in an optical axis of the motion picture camera, and at least one noise-insulating connection element disposed between the inner camera and the camera housing, and said at least one noise-insulating connection element being disposed parallel to the optical axis of the motion picture camera and has frequency-dependent rigidity with a higher rigidity relative to lower-frequency forces and a lower rigidity relative to higher-frequency forces. ### Claim 2 (depends on 1) The motion picture camera according to claim 1 wherein the noise-insulating connection element comprises an active connection element with variably active rigidity. ### Claim 3 (depends on 1) The motion picture camera according to claim 1 wherein the noise-insulating connection element has high inherent rigidity and dynamically controllable linear expansion. ### Claim 4 (depends on 1) The motion picture camera according to claim 1 wherein the length of the connection element with frequency-dependent rigidity is variable such that it corresponds to a relative movement between the inner camera and the camera housing with an infinitely soft connection between the inner camera and the camera housing under the action of a force corresponding to a periodically changing picture frequency of the motion picture camera. ### Claim 5 (depends on 1) The motion picture camera according to claim 1 wherein the low frequency force is an inertial force, the noise-insulating connection element has a length, and the noise-insulating connection element comprises a spring element with a spring constant, which permits only slight changes in length with the action of the inertial force as a function of either and both movement of the motion picture camera on a center of gravity of the inner camera and on a change in the position of the entire motion picture camera, a converter element disposed parallel to the spring element, the converter element having a low inherent rigidity compared to the spring element, and the converter element being controllable such that the total length of the noise-insulating connection element is variable. ### Claim 6 (depends on 5) The motion picture camera according to claim 5 wherein the converter element is selected from the group of converters comprising an electromagnetic, electrostrictive, magnetostrictive, and piezoelectric converter. ### Claim 7 (depends on 1) The motion picture camera according to claim 1 wherein the noise-insulating connection element is selected from the group comprising electromagnetic, electrostrictive, magnetostrictive, piezoelectric converter element with high inherent rigidity, whose length and thus the length of the entire noise-insulating connection element is variable through appropriate control. ### Claim 8 (depends on 1) The motion picture camera according to claim 1 further comprising a control circuit and wherein the noise-insulating connection element is linked to the control circuit, the control circuit including at least one sensor element, a filter element which passes only the higher-frequency force components from the sensor signal, and an evaluation circuit which generates a control signal for a converter element of the noise-insulating connection element. ### Claim 9 (depends on 8) The motion picture camera according to claim 8 wherein the sensor element comprises a force sensor with high inherent rigidity, and the sensor detects an interfacing force between the inner camera and the noise-insulating connection element. ### Claim 10 (depends on 8) The motion picture camera according to claim 8 wherein the sensor element comprises a force sensor with high inherent rigidity, and the sensor detects an interfacing force between the noise-insulating connection element and the camera housing. ### Claim 11 (depends on 8) The motion picture camera according to claim 8 wherein the sensor element comprises a force sensor with high inherent rigidity, and the sensor detects an interfacing force between the camera housing and a reference value. ### Claim 12 (depends on 8) The motion picture camera according to claim 8 wherein the sensor element comprises a force sensor with high inherent rigidity, and the sensor detects an interfacing force between the inner camera and a reference value. ### Claim 13 (depends on 8) The motion picture camera according to claim 8 characterized in that the sensor element consists of a length measuring sensor for detecting a distance between the inner camera and the camera housing or a length of the noise-insulating connection element. ### Claim 14 (depends on 8) The motion picture camera according to claim 8 wherein the evaluation circuit comprises a processor, which receives an output signal from the filter element, and the output signal is a function of changing forces acting on the inner camera, a vibration system including the inner camera mass, the camera housing mass, and the inherent rigidity of the noise-insulating element, and vibration behavior of the vibration system being extrapolated under the assumption that the noise-insulating element has infinitely soft rigidity. ### Claim 15 (depends on 14) The motion picture camera according to claim 14 wherein the processor comprising an amplifier circuit which issues a control signal to the converter element. ### Claim 16 (depends on 8) The motion picture camera according to claim 8 wherein the control circuit comprises a processor, the control signal issued by the processor for the converter element of the noise-insulating connection element is determined by detection of the vibration movement of the inner camera by the sensor elements with soft suspension and excitation with a force acting on the inner camera and the force and the control signal periodically changing with the operating and picture frequency or its multiple and is stored in a table memory. ### Claim 17 (depends on 8) The motion picture camera according to claim 8 wherein after output of the control signal to the noise-insulating connection element, an interfacing force is detected and the accuracy of the adjustment of the noise-insulating connection element is checked. ### Claim 18 (depends on 8) The motion picture camera according to claim 8 wherein derivation of the control signal for the noise-insulating connection element is optimized from a digitally modeled value of an excitation force through multiple repetition of the calculation. ### Claim 19 (depends on 18) The motion picture camera according to claim 18 wherein model parameters are varied using an algorithm and the control signal is varied such that vibrations caused by the variable, higher-frequency force are compensated for by the noise-insulating connection element enough that transfer of the excitation force to the camera housing is inhibited. ### Claim 20 (depends on 1) The motion picture camera according to claim 1 wherein the noise-insulating connection comprises a converter element which includes a multiplexed circuit for sensing force or length measurements. ### Claim 21 (depends on 1) The motion picture camera according to claim 1 further comprising a control circuit with a processor and wherein movement of the inner camera is detected in its operational state such that for the duration of the detection the noise-insulating connection element is replaced by a soft spring and the excitation force is detected under various operating conditions of the motion picture camera and is stored in table memory of the processor. ### Claim 22 (depends on 1) The motion picture camera according to claim 1 wherein the movement of the inner camera occurs separated from the camera housing such that the inner camera is softly suspended and its movements are measured in an operational state and stored in memory. ### Claim 23 (depends on 1) The motion picture camera according to claim 1 wherein the inner camera is linked to the camera housing by three active noise-insulating connection elements with variable length axes running parallel to the optical axis of the motion picture camera, and each of the active noise-insulation connection elements are disposed at an equal distance from a center of gravity of the inner camera. ### Claim 24 (depends on 1) The motion picture camera according to claim 1 further comprising a plurality of elastic elements whose rigidity is less than the inherent rigidity of the noise-insulating connection element and wherein the inner camera and the camera housing are linked by the elastic elements and the noise-insulating connection element, and the elastic elements are disposed such that the position of the inner camera is statically determined relative to the camera housing in multiple degrees of freedom. ### Claim 25 (depends on 1) The motion picture camera according to claim 1 further comprising at least one noise-insulating connection element disposed between the inner camera and the camera housing in a direction that is not parallel to the optical axis. ### Claim 26 A noise-insulated motion picture camera comprising: an inner camera; a camera mechanism attached to the inner camera, the camera mechanism generating noise and vibration during operation; a camera housing enclosing the inner camera and camera mechanism; a lens carrier with a lens mounted on the camera housing; the lens and the inner camera defining an optical axis; a noise-insulating connection element disposed between the camera housing and the inner camera; and the noise-insulating connection element comprising a converter element capable of changing length to inhibit noise and vibration created by the camera mechanism from being transmitted to the camera housing, and a spring in parallel with the converter element. ### Claim 27 A motion picture camera comprising: an inner camera, a camera mechanism to operate the inner camera, the inner camera and camera mechanism housed inside a camera housing having a primary housing and a carrier plate, a lens mounted on the carrier plate, a plurality of soft elastic connection elements linking the primary housing to the carrier plate, and at least one active noise-insulating connection element disposed to absorb vibration and noise in the direction of an optical axis of the camera. ### Claim 28 (depends on 28) The camera according to claim 28 further comprising a plurality of soft elastic connection elements linking the inner camera to the primary housing.