Method for controlling a video reflection device containing A CCD image converter and a video electronics unit, for a motion picture camera
AssigneeArnold & Richter Cine Technik GmbH & Co. Betriebs KG
InventorAnh Nguyen-Nhu
Life of this patent
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Abstract
A motion picture camera for transporting and exposing a motion picture film with an adjustable rotary shutter, a rotation surface (dark sector) of which reflects the recording path of rays to at least a video recording device that has a CCD image sensor and a video electronic mechanism, and an opening sector (bright sector) of which releases rays to a recording path for film exposure, and with a sensor for determining the shutter aperture angle of the adjustable rotary shutter. A shutter logic controls the light quantity falling onto the CCD image sensor and/or the charging of the CCD image sensor dependent upon the shutter aperture angle.
Claims9
A method for controlling a video reflection device for a motion picture camera containing a CCD image sensor and an adjustable rotary shutter, the rotary shutter having a reflection surface (dark sector) and an opening sector (bright sector), the method comprising:
- reflecting rays of a recording path at least to a video reflection device using the reflection surface of said rotary shutter;
- releasing the rays into the recording path for film exposure using the opening sector of the rotary sector;
- recording a shutter aperture angle of the rotary shutter by a sensor;
- and
- determining a preferred exposure time of the CCD image sensor based upon the recorded shutter aperture angle,
- controlling an exposure time of the CCD image sensor to correspond with the preferred exposure time.
A device for controlling a video reflection device in a motion picture camera comprising:
- an adjustable rotary shutter having a reflection surface (dark sector) and an opening sector (bright sector);
- a microprocessor having an input side and an output side;
- a video electronic mechanism arranged to emit a video timing signal that strikes the input side of the microprocessor;
- a sensor recording at least one of an angle of the rotary shutter opening sector and a position of the adjustable rotary shutter, the sensor arranged to emit a signal to the input side of the microprocessor;
- a timing generator having an input side and an output side and arranged to receive a signal on the input side from the output side of the microprocessor and also arranged to receive on the input side the video timing signal emitted by the video electronic mechanism;
- a CCD image sensor arranged to receive a signal from the output side of the timing generator;
- and a shutter logic arranged to receive a signal from the output side of the timing generator;
- wherein the shutter logic is arranged to emit a control signal with which the respective stored charge of the CCD image sensor is again discharged if the angle of the adjustable rotary shutter opening sector deviates from a prescribed value.
Dependencies are inferred from the claim text.