Abstract:
A digital camera back holder for use with a technical camera suspends the body of the digital camera back so that the sensor position is substantially forward of the rear standard.

Description:
TECHNICAL FIELD 
     The present invention relates in general to digital camera back holding, and more particularly to a digital camera back holder for use with a technical camera. 
     BACKGROUND OF THE INVENTION 
     Technical or view cameras typically have multiple articulated front and rear standards. The front standard typically carries a lens. The rear standard typically carries a recording medium, such as a sheet or roll of film. The rear standard typically carries a film holder just behind upright members. Typically the film is a sheet measuring 4 in. by 5 in. The lens, carried by the front standard, is held at an appropriate distance to form a focused image on the film. The front and rear standards are then separated from each other and connected to a flexible bellows to prevent light from reaching the film, other than through the lens. The separation of the standards, and the flexibility of the bellows, allows the standards to pivot upon a vertical axis (swing motion), or a horizontal axis (tilt motion), providing multiple focus plane options to the photographer. 
     The film may be replaced by digital sensors and associated electronics in a digital camera back. Digital camera backs with two-dimensional sensors (pixels distributed in a rectangular grid pattern) typically have sensor dimensions substantially smaller than 4 in. by 5 in. To obtain a field of view similar to that when film is used with the digital camera back, a lens of relatively shorter focal length is used. This arrangement requires that the two standards must be moved closer to each other to bring the image into focus. The lower limit of focal length is determined by the distance from the sensor location to the lens when the standards have been brought into contact with each other. This property not only limits the selection of lenses, but it also limits the pivotal movement of the standards. When the standards are in contact with each other, or when the bellows are fully compacted, swing and tilt motions are not available. 
     It is an important object of the invention to provide an improved digital camera back holder. 
     SUMMARY OF THE INVENTION 
     According to the invention, a digital camera back holder suspends the body of the digital camera back so that the sensor position is substantially forward of the rear standard. This feature allows the sensor to occupy a position much closer to the front standard, which may now carry a much shorter focal length lens and still maintain a substantial separation between its upright members. Thus, the invention simultaneously converts the camera from film recording capability to electronic recording capability and adjusts the relative position of the focal plane. This arrangement allows pivotal movement of the camera standards when fitted with lenses appropriate in focal length for the electronic sensor. 
     In a specific form the digital back camera holder according to the invention is a hollow can formed with front and rear openings with a rim surrounding the rear opening. The rim attaches to the exterior of the rear standard as does a standard film holder. The front of the can carries a clamping mechanism inside that grips the digital camera back near the plane of its sensor. This digital back camera holder according to the invention can be used for any digital camera back that meets the size requirements to be inserted within the body of the technical camera. The multiple articulated features of the technical camera may be used while recording images with electronic sensors through suitable lenses that are substantially smaller than those it was originally designed to carry. 
     Numerous other features, objects and advantages of the invention will become apparent from the following detailed description when read in connection with the accompanying drawing in which: 
    
    
     DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWING 
     FIG. 1 is a diagrammatic representation of a conventional technical or view camera with film holder attached; 
     FIG. 2 is a view of the technical camera of FIG. 1 with the front standard tilted; 
     FIG. 3 is a view of a technical camera with digital camera back attached to the rear standard in place of the film holder according to the prior art with the standards moved to a position of minimum separation precluding pivotal motion; 
     FIG. 4 is a diagrammatic representation of a technical camera converted for use with electronic sensor of relatively smaller size according to the invention; and 
     FIG. 5 is a diagrammatic representation of the digital camera back holder according to the invention. 
    
    
     DETAILED DESCRIPTION 
     With reference now to the drawing and more particularly FIG. 1 thereof, there is shown a diagrammatic representation of a technical or view camera with film holder attached as in the prior art. The camera includes a film holder  11  attached to a rear standard  12 . Bellows  13  intercouples rear standard  12  and front standard  14 , which carries lens  15 . Bellows  13  prevents light from entering between the lens and the film carried by film holder  11 . The mechanisms that allow rear standard  12  and front standard  14  to translate and rotate about several axes is not shown. 
     Referring to FIG. 2, the view camera of FIG. 1 is shown with front standard  14  tilted rearward in connection with performing a specialized focusing action. 
     Referring to FIG. 3, there is shown a technical camera with a digital camera  11 ′ in the place of film holder  11  having an electronic sensor  11 ″ in place of the film. The relatively small size of the sensor  11 ″ of camera  11 ′ requires a proportionately shorter focal length lens for an equivalent field of view to be recorded by sensor  11 ″. When the rear standard  12  and front standard  14  are moved to focus the image focused by the shorter focal length lens onto sensor  11 ″, they must come in close proximity to each other. In this position, they are no longer able to tilt as in FIG. 2, either because the uprights physically interfere with each other, or the bellows  13  cannot be further compressed. 
     Referring to FIG. 4, there is shown a technical camera converted for use with electronic sensor of relatively smaller size according to the invention. The digital camera back holder  21  is formed with an exterior rim  21 A that mates with the rear standard  12  of a commercial technical camera to provide mechanical attachment and a light-tight seal. A central aperture  23  in holder  21  allows light to pass from lens  15  to sensor  11 ″. A clamp  22  securely holds the digital camera to provide mechanical attachment and a light-tight seal. The digital camera back holder  21  is typically of square cross-section and made of aluminum. 
     Referring to FIG. 5, there is shown a diagrammatic representation of the novel digital camera back holder  21  having rim  21 A, central aperture  23  and clamp  22  as described above in connection with FIG.  4 . 
     There has been described novel apparatus and techniques for digital camera back holding. It is evident that those skilled in the art may now make numerous uses of and departures from the specific apparatus and techniques disclosed herein without departing from the inventive concepts. Consequently, the invention is to be construed as embracing each and every novel feature and novel combination of features present in or possessed by the apparatus and techniques disclosed herein and limited solely by the spirit and scope of the appended claims.