Rangefinder and method
阅读：937发布：2022-12-01
专利汇可以提供Rangefinder and method专利检索，专利查询，专利分析的服务。并且A rangefinder and a rangefinding method, the rangefinder being combined with a motion picture camera and comprising a transparent mirror mounted on the camera in an upwardly and forwardly inclinded position across the line of sight from an operator behind the camera to an object in front of the camera for viewing of the object through the mirror while the reflection of a second object a selected distance from the mirror is reflected therefrom in superimposed relation with the first object. This permits visual stereoscopic evaluation of the relative spacing of the two objects from the mirror and correction in the focus of the camera by moving the latter closer to or farther from the photographic object to maintain the two objects the same distance from the mirror. Alternatives include photographing of one object through the mirror in timed relation with periodic illumination of the reflected object, and photographing of the reflection of one object in timed relation with periodic illumination of the other.，下面是Rangefinder and method专利的具体信息内容。
1. For use in combination with a camera for photographing a photographic object, a rangefinder having: a partially reflective, transparent viewing element having a portion through which said object may be viewed; means for mounting said viewing element on the camera with said portion inclined upwardly and forwardly to extend across the line of sight of the operator of the camera toward the position of the object to be photographed; a frame mountable on said camera and extending above said viewing element; and means on said frame for supporting a reference object on said frame above said portion of said viewing element to reflect an image of said reference object back along said line of sight toward the operator in superimposed relation with the real image of said photographic object viewed by the operator through said viewing element, said supporting means including adjustments for varying the position of said reference object relative to said viewing element to space the reference object from the viewing element by the same distance that the photographic object is to be spaced from the viewing element when the camera is properly focused.
2. A rangefinder as defined in claim 1 in which said viewing element is a half-silvered mirror.
3. A rangefinder as defined in claim 2 in which said mirror is inclined upwardly and forwardly from said camera and is formed with an opening through which the photographic object is photographed.
4. A rangefinder as defined in claim 1 in which said supporting means include adjustments for lateral positioning and height positioning of the reference object.
5. A rangefinder as defined in claim 1 in which a plate is mounted on said supporting means with a reticle thereon constituting the reference object.
6. A rangefinder as defined in claim 1 in which said viewing element is disposed in front of said camera for photographing of said photographic object through a reflecting portion of the viewing element, and further including means for periodically illuminating said reference object in timed relation with the operation of the camera to illuminate said reference object only when the shutter of the camera is closed.
7. The method of setting and maintaining the focus of a camera relative to a moving subject to be photographed, said method comprising the steps of; initially focusing the camera on an initial position of the subject; supporting a partially reflective, transparent viewing element in a selected position relative to said camera for viewing of said initial position from said camera through the viewing element; positioning a reference object relative to said viewing element to reflect an image of the reference object from the viewing element back toward the camera and spacing said reference object the same distance from said viewing element as said initial position is spaced from the viewing element; and moving said camera relative to said subject to maintain the virtual image of said reference object and said subject in the same apparent planes relative to said viewing element as the subject moves.
8. The method defined in claim 7 in which said viewing element is positioned for photographing of said subject around the viewing element.
9. The method defined in claim 7 in which said viewing element is positioned for photographing of said subject through the viewing element, and including the further step of illuminating said reference object in timed relation with the operation of said camera to reflect its image only when the shutter is closed.
10. The method defined in claim 7 in which said viewing element is positioned for photographing of said subject through the viewing element and for photographing the image of said reference object in superimposed relation therewith.
11. A rangefinding method comprising the steps of: positioning a first object in a selected first position; positioning a partially reflective, transparent viewing element for viewing of said first object through the viewing element; positioning a second object relative to said viewing element in a second position a selected distance from said viewing element to reflect an image of the second object from the portion of the viewing element in which the first object is viewed; and moving one of said objects relative to said viewing element to change the spacing of said one object from the viewing element until the position of the image of said one object coincides with the image of the other object.
12. In combination with a camera for photographing a photographic object and having an optical axis, a stage for supporting a photographic object, and means supporting said camera and said stage for selective relative movement to maintain the camera in focus during movement of the photographic object, a rangefinder comprising: a reference object; a viewing element having a partially reflective transparent portion through which one of said objects can be viewed; means mounting said viewing element on said camera with said partially reflective transparent portion in a plane extending across the line of sight of the operator of the camera toward the position of said one of said objects positioned along said optical axis; and means adjustably supporting said reference object on said camera for movement therewith and for positioning said reference object a preselected distance from one side of said viewing element, so that an image of said reference object can be viewed while looking along said line of sight through said partially reflective transparent portion while said stage is spaced from the other side of said viewing elemEnt a distance approximately the same as said preselected distance and positioned to display the image of said photographic object against the image of said reference object for stereoscopic evaluation of the relative distances of said objects from said viewing element and for selective movement of said camera relative to said stage to focus the camera on the image of said photographic object and to maintain the focus as the photographic object moves on said stage.
13. The combination defined in claim 12 in which said reference object is positioned along said optical axis for direct viewing along said line of sight, and said stage is positioned for reflection of an image from said viewing element toward said camera along said optical axis, and further including means for illuminating said reference object periodically in timed relation with the operation of said camera whereby the reflection of said photographic object may be photographed from said viewing element without photographing the real image of said reference object through said viewing element.
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