Showing papers by "Apple Inc. published in 1972"
Patent•
07 Dec 1972TL;DR: In this article, a device for receiving light from a single source and producing two parallel image outputs having equal intensity is described. But it is not shown in this paper because of the complexity of the system.
Abstract: A device for receiving light from a single source and producing two parallel image outputs having equal intensity. Totally reflective mirrors receive light from the source through lenses and reflect the respective images to emerge from the device at approximately 8 millimeters separation. One lens is mounted in each light path and a third lens is rotatably mounted for alternate use in conjunction therewith whereby both images may be presented through spherical lenses or cross cylinder lenses depending upon the position of the third lens. The lenses and reflective mirrors may be rotated to permit examination of an eye for oblique astigmatism.
4 citations