Motor-driven focusing apparatus of a sighting telescope
US6269580A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 14, 1999 |
| Grant date | Aug 7, 2001 |
| Priority date | — |
| Expiry date | Oct 14, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B23/14
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A motor-driven focusing apparatus of a telescope, includes a telescopic optical system which includes a focusing lens group guided along an optical axis; a motor-driven lens moving device which drives the focusing lens group along the optical axis; a manual operating switch for actuating the motor-driven lens moving device; and a lens-control device for controlling the motor-driven lens moving device when the manual operating switch is turned ON, so that the moving amount per unit time of a focal point of the telescopic optical system, that is caused by a movement of the focusing lens group, is kept substantially at a constant speed regardless of the position of the focusing lens group on the optical axis, the constant speed being selected from one or more constant speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.