Optical: systems and elements – Lens – With support
Reexamination Certificate
1999-10-18
2001-06-26
Epps, Georgia (Department: 2873)
Optical: systems and elements
Lens
With support
C396S342000
Reexamination Certificate
active
06252727
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an arrangement for pivoting an objective or image frame and including a guide unit having an arcuate groove, and a pivotable part, in which the objective or image plane is supported and which has an arcuate slide section displaceable in the groove relative to the guide unit. The present invention also relates to a carrier for supporting the objective or image frame with the pivoting arrangement.
2. Description of the Prior Art
In DE-17 72 918 there is described a plate camera with an image frame and an objective frame which can be pivoted about a horizontal axis and about a vertical axis. For this purpose, the plate camera contains an arrangement which consists essentially of a stand, a segment and a cross slide. The support is respectively secured to the frames and determines the vertical pivot axis. The support is journalled in the segment with the aid of a rotary bearing with balls and is movably supported on a cross-slide which is displaceably journalled in a pivotal member and can be locked by means of a clamping device. In the cross-slide there are provided races for balls which extend along circular arcs concentrically about the horizontal pivot axis. The balls roll off on these races so that the smallest possible friction forces are to be overcome. For the pivoting of the image frame about the horizontal pivot axis a mechanism is provided. Instead of the balls, sliding bearings of low friction material can be provided.
The disadvantage of this arrangement is essentially to be seen in the fact that a mechanism is provided for the pivoting about the axis and/or a means is provided for the fixation of the position.
The invention is based on the object of improving an arrangement for the pivoting of an optical apparatus.
SUMMARY OF THE INVENTION
This and other objects of the present invention, which will become apparent hereinafter, are achieved by providing means for adjusting the width of the groove in which the slide section is displaced, and by providing a carrier for an objective or image frame and including means for pivoting the frame about a vertical axis, with the arrangement for pivoting the frame about the horizontal axis being arranged above the means for pivoting the frame about the vertical axis.
The advantages which can be achieved with the invention are to be seen in fact that the arrangement is simply constructed, the space requirement is small and free of servicing and no fixing means is required.
The carrier has the advantages that the arrangement which determines the horizontal pivot axis is arranged above the means which determines the vertical pivot axis so that the objective frame or image frame does not execute any form of wobbling movement during the pivoting about the two axes and so that the constructional height and the weight are reduced by the avoidance of the mechanism for the pivoting.
REFERENCES:
patent: 4372609 (1983-02-01), Boisset
patent: 4783673 (1988-11-01), Vogt
patent: 5380062 (1995-01-01), Nania
patent: 5809340 (1998-12-01), Donner
patent: 213078 (1987-03-01), None
Arca Swiss International S.A.R.L.
Epps Georgia
Seyrafi Saeed
Sidley Austin Brown & Wood LLP
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