Automatic focusing telescope

Details Automatic focusing telescope Automatic focusing telescope

1991-05-15

1992-06-30

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

359407, G01J 120

Patent

active

051265494

ABSTRACT:
An automatic focusing telescope capable of automatic focusing. This automatic focusing telescope includes object lens means for forming an inverted image of an object, ocular lens means for observing the image formed by the object lens means, erect prism means having a plurailty of reflective surfaces and arranged between the object lens means and the image of the object to erect the inverted image, semitransparent surface means formed on one of the plurality of reflective surfaces of the erect prism means to branch the light ray from the object lens means into a transmitted light path and a reflected light path, auxilary prism means arranged on the transmitted light path from the semitransparent surface means and having an exit surface perpendicular to the transmitted light path, focal point detecting means for receiving the image of the object formed in one of the light paths branched from the semitransparent surface means to detect the focal point thereof, and drive means responsive to a signal from the focal point detecting means to move at least one of the object lens means and the ocular lens means to adjust the focal point.

REFERENCES:
patent: 3069972 (1962-12-01), Tibbetts et al.
patent: 3645602 (1972-02-01), Clave et al.
patent: 4293187 (1981-10-01), Ishibai
patent: 4687913 (1987-08-01), Chaban
patent: 5005040 (1991-04-01), Norita et al.

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