JP2012203263A5 - - Google Patents

Description

An interchangeable lens according to a main aspect of the present invention is an interchangeable lens having at least a first lens group and a second lens group that are movable in the optical axis direction in order to perform optical zoom. A zoom operation unit for instructing the optical zoom to move the lens group in the optical axis direction, and the first lens group in the optical axis direction according to the operation on the zoom operation unit A first lens group driving section to be moved, a first lens group position detecting section for detecting a position of the first lens group moved by the first lens group driving section, and a predetermined focal point of the interchangeable lens A storage unit for storing position information of the first lens group and the second lens group corresponding to a distance; and a position of the first lens group detected by the first lens group position detection unit ; Before being stored in the storage unit And a control unit for movement control said second lens group on the basis of the position information.

FIG. 15 shows the relationship between the focus (FC) shift and the resolution of the second zoom group (2G) 7 when the resolution of the linear encoder 16 is sufficient. When the amount of change in the output of the linear encoder 16 of the second zoom group (2G) 7 becomes intervals ta, tb, tc (interval t2) shorter than the interval t1, the movement of the third zoom group (3G) 8 is controlled. To do.
FIG. 16 shows the focus (FC) shift and the resolution of the second zoom group (2G) 7 when the determination threshold (determination threshold) is changed in accordance with the zoom position of the second zoom group (2G) 7. Shows the relationship. On the wide (Wide) side where the allowable depth is deep, the third zoom group (3G) 8 is changed every time the change amount of the absolute position of the second zoom group (2G) 7 detected by the linear encoder 16 becomes the interval t1. It moves in the direction of the optical axis P. On the tele (Tele) side T1 where the allowable depth is shallow, the third zoom group (3G) 8 every time the change amount of the absolute position of the second zoom group (2G) 7 detected by the linear encoder 16 becomes the interval t2. Is moved in the direction of the optical axis P. The interval t1 is set longer than the interval t2 (t1> t2).

Claims (7)

In an interchangeable lens having at least a first lens group and a second lens group that are movable in the optical axis direction for optical zooming,
A zoom operation unit for instructing the optical zoom to move the first lens group in the optical axis direction in response to an operation ;
A first lens group driving unit that moves the first lens group in the optical axis direction in response to the operation on the zoom operation unit;
A first lens group position detector that detects a position of the first lens group that is moved by the first lens group driver;
A storage unit for storing position information of the first lens group and the second lens group corresponding to a predetermined focal length of the interchangeable lens;
A control unit configured to control movement of the second lens group based on the position of the first lens group detected by the first lens group position detection unit and the position information stored in the storage unit;
An interchangeable lens comprising: The storage unit stores information relating to a determination threshold for determining the amount of movement of the first lens group,
The control unit compares the amount of movement of the first lens group with the determination threshold value according to the position information of the first lens group stored in the storage unit, and moves the first lens group. When it is determined that the amount exceeds the determination threshold , the second lens group is controlled to move based on the position information stored in the storage unit.
The interchangeable lens according to claim 1. 3. The interchangeable lens according to claim 2 , wherein the determination threshold value changes in accordance with a position of the first lens group detected by the first lens group position detection unit . When the first lens group is located at a position corresponding to the wide side, the determination threshold value is larger than when the first lens group is located at a position corresponding to the tele side. The interchangeable lens according to claim 3 . A speed detector that obtains the moving speed of the first lens group based on the position of the first lens group detected by the first lens group position detector;
The control unit controls the moving speed of the second lens group based on the moving speed of the first lens group obtained by the speed detecting unit .
The interchangeable lens according to claim 1 . The speed detection unit obtains a moving speed of the first lens group based on a time difference in which each position of the plurality of first lens groups is detected by the first lens group position detection unit. The interchangeable lens according to claim 5. 2. The interchangeable lens according to claim 1, wherein the first lens group position detection unit detects an absolute position of the first lens group.