04807985 is referenced by 20 patents and cites 1 patents.

An automatic focusing system for a terrestrial telescope comprises a frame worn on the head of a person, a fixed frame part mounted to the frame in viewing relationship to an eye of the wearer, a movable lens part carrying a telescopic lens which is slidably movable along a telescopic axis relative to the fixed frame part, an engagement member fixed to the movable lens part, a pendulum sensor mounted to the frame for detecting a change in inclination angle of the head of the wearer, and a drive circuit and motor responsive to the sensor for moving the movable lens part to a lens position corresponding to the head inclination angle detected by the pendulum sensor.

Title
Automatic focusing system for telescopes
Application Number
7/156702
Publication Number
4807985
Application Date
February 17, 1988
Publication Date
February 28, 1989
Inventor
Richard E Feinbloom
New York
NY, US
Agent
Arthur L Plevy
Assignee
Designs for Vision
NY, US
IPC
G02B 7/02
G02C 7/08
G02C 1/00
View Original Source