1987-01-22
1988-08-09
Gellner, Michael L.
354189, G03B 506, G03B 508, G03B 1910
Patent
active
047631473
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Area of the Invention
The present invention relates to a special purpose camera having a supporting rail on which a pair of holders are arranged for movement independently from each other in the longitudinal direction of the rail, and of which each comprises a carriage and a first joint for pivoting of the carrying arms about a vertical axis and a second joint or hinge for pivoting the objective or the picture holder about a horizontal axis.
The picture carrier may be in the form of a frosted glass disk or a photographic plate or a film.
2. State of the Art
Such cameras are preferably used by professional photographers since they enable the purposeful influencing of the perspective and sharpness by pivoting as well as displacing of the picture and the objective holders for maintaining the parallels, performing corrections of the picture details, tricks, etc. By pivoting the picture holder about a pair of mutually vertical axes, one may, for example, vary the distance between the objective and the individual regions of the picture plane and thereby the individual objects or portions of objects, which have different distances with respect to objective and/or are displaced sideways with respect to the optical axis of the objective camera can be imaged in an optimum sharp fashion. During the use of the camera it is common that after accomplishment of the presetting, the pivoting of the picture carrier are transposed onto the objective carrier width and then the picture carrier is reset again into its unpivoted initial position and, by displacing the picture carrier with respect to the objective carrier, the width of the picture is readjusted for an optimum imaging sharpness for all the picture portions, without the changing of the object width. For this reason the camera on its various joints or hinges and along the carrier or support rails is provided with scales as, on which the amount of the pivoting or displacement can be read. The above described operating manner has its advantage in that the perspective is not changed, and the set up difficulties associated with the pivoting of the objective will not occur due to the changes of the focus. Such operating fashion has, however, ascertained these advantages. The scales, especially on the hinges, for reasons of tight space, have a relatively small diameter and, therefore, a correspondingly coarse gradation, which effects the accuracy of the transposing of the pivoting of the joints on one of the holders onto the joints of the other holder. In addition the reading of the relatively inaccurate scale becomes even more difficult when the object to be photographed is illuminated brightly and the camera must be shielded against the bright light, and while a distance from the eye of the operating person is smaller than the distance to the object, this will pose and require a continuous and tiring accommodating of the eye.
THE INVENTION
It is, therefore, an object of the present invention, to provide a special purpose camera, which enables the transposing of the pivoting of the hinges of one carrier onto the hinges of the other carrier with a substantially higher accuracy, without interfering or tiring the operating person due to insufficient lighting or requiring continuous accommodation.
According to the invention such object is resolved with a special purpose camera of the above mentioned type camera, which is characterized in that each hinge and/or each carrier has a sensor associated therewith, which produces an electrical signal corresponding to the angle of rotation of the hinge or to the longitudinal displacement of the carriage on the carrier rail and furthermore by providing an electronic switching arrangement which processes such electrical signals and which produces an optical or acoustical indication, when the angle of rotation of at least one of the hinges of one holder corresponds to the angle of rotation of the corresponding hinge of the other holder and/or the sine of the angle of rotation of one of the hinges on the obje
REFERENCES:
patent: 3479945 (1969-11-01), Koch
patent: 3825938 (1974-07-01), Koch
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