Lens focus control apparatus
US5506654A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1994 |
| Grant date | Apr 9, 1996 |
| Priority date | — |
| Expiry date | Feb 4, 2014 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/633
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A lens focus control apparatus and method for use in a camera optical system and which is manually manipulated by a user, includes a lens position detector for detecting current positions of a focus lens and a zoom lens, a memory for storing a movable region value of the focus lens, a current position value of the focus lens and a contrast ratio value therein, and a display. The display indicates the current position of the focus lens, the range of movement of the focus lens, and the movement direction in the movable region of the focus lens. A microcomputer controls the above elements to adjust an exact focus and to display an exact focus direction using the contrast ratio value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.