Lens controller

Abstract

The present invention provides a lens controller which electrically controls a focus and a zoom of a taking lens, the lens controller comprising: an AF control device which automatically controls the focus of the taking lens so that a given subject imaged by the taking lens is in focus; and a view angle correction device which keeps an angle of view of the taking lens constant by moving the zoom of the taking lens to prevent a variation of the angle of view associated with a movement of the focus moved by the AF control device; wherein, when the focus is moved by the AF control device, the view angle correction device detects a current position of the focus by a position detecting device, obtains a position of the zoom for preventing the variation of the angle of view based on the detected current position of the focus, and moves the zoom to the obtained position.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a block diagram which shows a configuration of a lens controller to which the present invention is applied;

FIG. 2 is a schematic diagram used for illustrating view angle correction data;

FIG. 3 is a schematic diagram used for illustrating a view angle correction operation; and

FIG. 4 is a flowchart which shows an operating procedure of a view angle correction process.

Claims

1. A lens controller which electrically controls a focus and a zoom of a taking lens, the lens controller comprising: an AF control device which automatically controls the focus of the taking lens so that a given subject imaged by the taking lens is in focus; anda view angle correction device which keeps an angle of view of the taking lens constant by moving the zoom of the taking lens to prevent a variation of the angle of view associated with a movement of the focus moved by the AF control device.

2. The lens controller according to claim 1, wherein, when the focus is moved by the AF control device, the view angle correction device detects a current position of the focus by a position detecting device, obtains a position of the zoom for preventing the variation of the angle of view based on the detected current position of the focus, and moves the zoom to the obtained position.

3. The lens controller according to claim 2, further comprising an MF control device which controls the focus of the taking lens to be in a target position specified based on a manual operation, whereinthe view angle correction device obtains the position of the zoom for preventing the variation of the angle of view based on the target position and moves the zoom to the obtained position when the focus is moved by the MF control device.