Polaroid Corporation

Bell + Howell Company

Emi, LLC

John P Bagby

Kenyon A Hapke

Erwin E Figge

Thomas R Wells

Leonard A Ferrari

Raymond W Kim

George C Karalus

Eugene F Koppensteiner

Frank L Weninger

Jack W Hinshaw

Roger R Tomlinson

In a computerized tomography (CT) apparatus, in which a fan-shaped X-ray distribution is rotated around the body of a patient, it is possible to use a ring of non-rotating detectors disposed to receive the radiation after passage through the body along a cross-sectional slice. The ring may be tilted and precessed axially so that detectors on the same side of the body as the source do not interrupt the radiation. A second source is disposed on the opposite side of the body to the first to irradiate the detectors when moved out of the radiation from the first and thereby to examine a second cross-sectional slice at the same time as the first slice.

Medical radiographic apparatus

A film cassette sensing and retaining unit for film handling apparatus. The unit is responsive to completed insertion of a cassette into the film handling apparatus to mechanically latch the cassette in position and to electrically condition and actuate the film handling apparatus. Upon termination of operation of the film handling apparatus, the unit is effective to unlatch and eject the cassette and thereby deactuate the film handling apparatus. A disabling mechanism is provided to prevent premature unlatching and ejection of the cassette in a particular circumstance.

Film cassette sensing and retaining unit

A control for varying the speed of advancement of film is described for use in a film projector in which the film is advanced by a shuttle tooth which engages perforations in the film and advances the film along a path between a light source and a projector aperture. The control includes a rotary shutter assembly having one or more shutter blades for interrupting the light from the light source. As the shutter assembly rotates, the shuttle tooth is reciprocated in the direction of film feed by a rotary cam having one or more cam lobes mechanically coupled to the shuttle tooth. The rotation of the cam lobes is synchronized to the rotation of the shutter blades such that the shuttle tooth is positioned for engagement with the perforations associated with the next successive film frame to be projected whenever a shutter blade interrupts the light source. To engage the shuttle tooth with the film perforations, means are included for sensing the interruption of the light source by the shutter blades to generate a train of pulses, each equal in separation to 1/Nth number of light interruptions, (where N is selectable) and, in response to each pulse, means for advancing the shuttle tooth into engagement with the film perforations so that the film may be advanced by the next motion of the shuttle tooth in the direction of film feed. Thus, the film is engaged and advanced upon each reciprocation of the shuttle tooth when N equals one, and at a selectably slower rate when N is greater than one.

Film advancement control for motion picture projector

A film handling apparatus blower system. The system includes a blower having a high-pressure, low-volume section and low-pressure, high-volume section. The high-pressure, low-volume section is a scroll-type centrifugal blower with a circular impeller of cellular material to minimize discernible noise, an axial intake port, and a high-pressure outlet port. The high-pressure outlet port is coupled to a duct which directs the output high-pressure air flow into a film cassette. The low-pressure, high volume section is also a scroll-type centrifugal blower having a bladed fan wheel, an axial intake port, and three low-pressure outlet ports. One low-pressure outlet port is coupled to a duct which directs output air flow to a location for flow adjacent the rearward portion of a projection lamp. A second low-pressure outlet port is coupled to a duct which directs output air flow to a location for flow adjacent the frontal portion of the projection lamp. A third low-pressure outlet port is coupled to a duct which directs output air flow across the AC drive motor of the film handling apparatus.

Film handling apparatus blower system

A system for initiating operating mode change in a film handling apparatus in response to cessation of film movement incident to an end-of-film condition.

Growing community of inventors

Lake Forest, IL, United States of America

John P Bagby