Focusing aid for copying cameras
OwnerGladys Rabinow, Jacob Rabinowinventors
Life of this patent
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Abstract
A device for assisting a person in focusing a camera on a surface is provided. A mirror at an angle of 45.degree. to the horizontal, and an incandescent filament, are mounted on a device that may rest on the surface to be photographed. The distance from the filament to a point on the mirror equals the distance from that point to the surface. By focusing the camera on the image of the filament that appears in the mirror, the camera will be correctly focused on the surface.
Claims6
A device to aid in focusing an optical device onto a first surface, comprising:
- means for producing a brightly illuminated image, said device having a second surface for contacting said first surface, and reflecting means to make the reflection of this said image to appear to be in the said first surface.
A device to place a brightly lit virtual image of a bright source of light onto a surface, comprising a brightly lit source of light, reflecting means to intercept some of the light from said source and to reflect this light so as to forms the said brightly lit virtual image, the said reflecting means so positioned in said device that the said brightly lit virtual image is coincident with the said surface.
Dependencies are inferred from the claim text.