Abstract: A light-adjusting unit includes: a pair of light-shielding plates arranged about an illuminating optical axis of an incoming light flux and configured to block the light flux in response to the amount of rotation; a pair of rotation transmitting gears configured to hold and rotate the pair of light-shielding plates respectively; a pair of supporting shafts configured to rotatably support the pair of rotation transmitting gears respectively; a supporting substrate on which the pair of supporting shafts are provided; and a pair of urging members configured to press and urge the pair of rotation transmitting gears respectively against the supporting substrate.
Abstract: Disclosed herein is an imaging device including: a lens mount section with a removable lens section; an imaging element adapted to generate a video signal by converting image light of the subject entering through the lens section attached to the lens mount section into an electric signal; a disk-shaped shutter having a light shielding section and a transmission section, the light shielding section adapted to shield the imaging element from incident light, and the transmission section adapted to transmit incident light onto the imaging element; a shutter drive motor adapted to drive the disk-shaped shutter; a detection section adapted to detect whether the lens section is attached or detached; and a shutter control section adapted to supply a control signal to the shutter drive motor to stop the shutter if the detection section has detected that the lens section is detached.
Abstract: Disclosed herein is an imaging device including an imaging element, an imaging controller, first and second shutter members, and a shutter controller. The imaging element carries out photoelectric conversion of subject image light incident through a lens and produces an imaging signal. The imaging controller controls readout of the imaging signal and carries out control of change setting of a frame cycle of imaging. The shutter members are disposed on an optical path of image light incident and can set a state in which incident light on the imaging element is blocked and a state in which incident light on the imaging element is not blocked. The shutter controller sets a timing at which the optical path is blocked by the first shutter member and a timing at which the optical path is blocked by the second shutter member.
Abstract: The invention relates to a method and a device for detecting the opening angle of the shutter (light or dark sector) of an adjustable rotating shutter (1) arranged in a film camera. Said shutter comprises a circular-segment-shaped or circular-sector shaped shutter wing (2) which is driven by a shutter motor via a shutter shaft (20), and also comprises an adjustable shutter adjustment wing (3) arranged in a coaxial manner in relation to the shutter wing (2) and which can be displaced in relation to said shutter wing by means of a shutter adjustment wing motor (33). According to the invention, the position of the shutter wing (2) and the position of the shutter adjustment wing (3) are detected during a rotation of the rotating shutter (1) and the difference between the two positions forms a value for the shutter opening angle or the light or dark sector of the rotating shutter (1).
March 11, 2003
Date of Patent:
October 2, 2007
Arnold & Richter Cine Technik GmbH & Co. Betriebs KG
Abstract: A camera includes a first sensor disposed to image light that propagates along a reflected axis, a second sensor disposed to image light that propagates along a direct axis, and a rotatable structure disposed to define a rotation plane that is oblique to both the reflected axis and the direct axis. The rotatable structure includes either a first transmission sector, a first reflection sector disposed adjacent to the first transmission sector, a second transmission sector disposed adjacent to the first reflection sector and a second reflection sector disposed adjacent to the second transmission sector or the rotatable structure includes a first reflection sector, a first opaque sector disposed adjacent to the first reflection sector, and a first transmission sector disposed adjacent to the first opaque sector.
January 24, 2002
Date of Patent:
February 13, 2007
Douglas Raymond Dykaar, Colin J. Flood, Charles Russell Smith
Abstract: A shutter device for a camera with an adjustable aperture comprises a connecting member for connection to a camera lens, the connecting member disposed along an optical axis; an image aperture disposed along an extension of the optical axis; and a reflective shutter and a shutter which are configured to cover the image aperture at least over a pre-settable period of time on a connection side of the image aperture facing the connecting member. The reflective shutter is disposed rotatably via a reflective shutter shaft, and the reflective shutter shaft is disposed perpendicularly to a plane of a reflective surface of the reflective shutter. The shutter is rotatably disposed via a shutter shaft, such that a combined shutter region results from projection in a direction of the optical axis to the image aperture, which is composed of a shutter region of the shutter and a shutter region of the reflective shutter.
Abstract: A high resolution, high frame rate digital cinematographic camera system having an improved shutter system. An exemplary digital cinematographic camera system comprises a digital camera with an image sensor, a shutter drive motor, and a double shutter system. The double shutter system comprises primary and secondary shutter blades that revolve at differential rates. A preferred double shutter comprises a 1× rotation speed primary shutter blade with an adjustable open angle of 360 degrees minus the equivalent angle read-out time of the image sensor and a 2× rotation speed secondary shutter blade with a fixed open angle of 360 degrees minus the effective clear aperture at the shutter plane. The 2× rotation speed secondary shutter blade has leading and lagging edge rates that are twice the leading and lagging edge speed of the primary shutter blade to provide additional exposure time and readout time.
Abstract: An improved motion picture film projector (100) comprises a Geneva Mechanism (120), which intermittently drives a film (114). A light source (116) projects light through the film (114) and a shutter (106) periodically interrupts the light source (116). The shutter (106) has a blade with a shaped edge, which matches the frame shape on the film (114) thus, increasing the amount of light that is transmitted through the film (114). A second edge of the blade also matches the frame shape on the film (114) further increasing the amount of light transmitted through the film (114).
Abstract: In a cinematic film projector a light source projects light through a single, non-centric light transparent transmission window formed in a rotary shutter, and through an image window and an image of a film which passes step by step past the image window for projection by a projector lens onto a cinema screen. In order to obtain a higher image frequency, the rotary shutter is made of light transparent material that is coated so that light passes through only its single light transmission window. Thereby the rotary speed of the rotary shutter can be significantly increased.
Abstract: An illumination obscurement device for controlling the obscurement of illumination from a light source which is optimized for use with a rectangular, arrayed, selective reflection device. In a preferred embodiment, a rotatable shutter with three positions is placed between a light source and a DMD. The first position of the shutter is a mask, preferably an out of focus circle. This out of focus circle creates a circular mask and changes any unwanted dim reflection to a circular shape. The second position of the shutter is completely open, allowing substantially all the light to pass. The third position of the shutter is completely closed, blocking substantially all the light from passing. By controlling the penumbra illumination surrounding the desired illumination, DMDs can be used in illumination devices without creating undesirable rectangular penumbras.
Abstract: In a film projection system which contains a light source which emits a large amount of radiant energy and has means for advancing the film through a gate, there is a new and improved shutter comprising a high temperature rated, transmissive substrate having at least one area having a cold mirror coating affixed thereto and a second area with a hot mirror coating affixed thereto such that when the shutter rotates within the projector, the shutter area containing the cold mirror coating is placed in front of the light source when the film is moving through the gate and the shutter area containing the hot mirror coating is placed in front of the light source when the film is located within the gate, such that the thermal deformation of the film caused by the variations in the energy between the time the film is exposed and the time when the film is moving through the gate is minimized.
Abstract: A compactly constructed shutter and support apparatus in a camera permits placement of the shutter in close proximity with a film strip to minimize weight and moment of inertia of the shutter for rapid repetitive starting and stopping of the shutter in response to control signals to a drive mechanism.
Abstract: A pressure plate assembly is pivotally mounted about a pivot axis horizontally displaced from the assembly and vertically responsive to movement of a cam. A pair of rods, nested within an underlying aperture plate assembly during imaging, lifts the film during transport and permit horizontal sliding of a film strip into the film transport compartment from without.
Abstract: A focal plane shutter for a video camera has a pair of disks rotated in the same direction about a common axis in synchronism with the raster scan blanking interval. The disks each have one or more openings which overlie one another to define a light admitting shutter aperture positioned to illuminate the video pickup device. The opening in at least one of the disks is counterbalanced during rotation by a recessed relief area which does not extend through the disk, or by a weighted plate attached to the disk.
Abstract: A first apertured shutter rotates almost a full revolution in a first direction, and a second apertured rotary shutter rotates almost a full revolution in an opposite direction before the apertures of both blades are present at the optical axis to effect exposure, thereby to reduce dynamic disturbances owing to the reduced blade accelerations required.
Abstract: A motion picture camera includes a film pull down mechanism and shutter in which film is moved from one frame to the next in a 360.degree. operating cycle made up of a pull down time and a dwell time. The film pull down mechanism is designed to pull the film down in a period less than the dwell time of the film so that film exposure is increased over that occurring when the pull down time and dwell times are equal. The shutter has an opaque sector less than 180.degree. and an open sector greater than 180.degree. responsive to operation of the pull down mechanism to eclipse the film from exposure during the pull down time. The film pull down mechanism further includes a means for varying the length of film pulled down so that film frames of different vertical dimensions can be properly exposed by the same motion picture camera.
Abstract: A shutter is rotatably mounted within a housing for opening and closing a shutter aperture formed in the housing. The shutter is coupled to a drive unit for unidirectionally rotating the shutter with the same velocity profile to open and close the shutter aperture during each exposure period. This drive unit includes a source of position and velocity data and a feedback loop configurable for either position or velocity control of the shutter as determined by a control command.
Abstract: A rotary shutter for a motion picture camera consists of two sector blades which are rotatable about the same shaft. The angular relative position of one sector blade to the other is fixed to have a fixed open angle thereby when a smaller open angle is desired. When a larger open angle is desired, one sector blade is fixed in the camera at a position to open an exposure aperture and only other blade is rotated. One sector blade is selectively engaged with the other sector blade or fixed in the camera by axial movement thereof.
Abstract: A rotating or reciprocating shutter synchronized with the film drive of a cinematographic camera carries or incorporates a light-guiding body of transparent material interposed between the camera objective and its light gate during periods of film transport to direct incident light onto a photoelectric element. The light-guiding body has a flat front surface perpendicular to the optical axis and a generally dihedral internally reflecting rear surface whose faces converge forwardly at a ridge intersecting that axis.