Lens control apparatus and lens control method

1. A lens control apparatus comprising:

a focusing lens capable of moving in an optical axis direction provided within a lens barrel including a photographing lens;

a ring rotatably disposed to the lens barrel within an angle range between a first end point and a second end point;

a memory that stores a first relationship between a rotation angle of the ring and a value relating to a photographing distance corresponding to a first photographing distance area and a second relationship between a rotation angle of the ring and a value relating to a photographing distance corresponding to a second photographing distance area on a shorter distance side than the first photographing distance area;

a rotation angle detector that detects a rotation angle of the ring; and

a controller that controls a position in an optical axis direction of the focusing lens by selecting the first relationship or the second relationship in accordance with a rotation angle of the ring detected by the rotation angle detector and calculating a value relating to a photographing distance in accordance with a rotation angle of the ring.

2. The lens control apparatus according to claim 1 ,

wherein in the second relationship, an amount of change in a value relating to a photographing distance to a rotation angle of the ring is larger than that in the first relationship.

3. The lens control apparatus according to claim 1 , comprising:

a zoom position detector that detects a zoom position of a zoom lens group which is provided within the lens barrel,

wherein the memory stores a plurality of the second relationships in accordance with the zoom position.

4. The lens control apparatus according to claim 3 ,

wherein in a plurality of the second relationships, a shortest distance at which focusing by the focusing lens is possible is different depending on the zoom position.

5. The lens control apparatus according to claim 1 ,

wherein the lens barrel is provided with photographing distance indications disposed corresponding to indexes provided on the ring.

6. The lens control apparatus according to claim 1 , further comprising:

a ring position switch mechanism that switches the ring to a plurality of positions in an optical axis direction,

wherein in a case where the ring is set at a predetermined position by the ring position switch mechanism, control by the controller is executed.

7. The lens control apparatus according to claim 1 , further comprising:

a ring position switch mechanism that switches a control mode of performing control in accordance with a relative rotation position of the ring and a control mode of performing control in accordance with an absolute rotation position of the ring according to a plurality of positions in an optical axis direction,

wherein the controller performs the control in a case where the control mode of performing control in accordance with an absolute rotation position of the ring is selected.

8. A lens control method of an imaging device having a focusing lens capable of moving in an optical axis direction provided within a lens barrel including a photographing lens, a ring rotatably disposed to the lens barrel within an angle range between a first end point and a second end point, a memory that stores a first relationship between a rotation angle of the ring and a value relating to a photographing distance corresponding to a first photographing distance area and a second relationship between a rotation angle of the ring and a value relating to a photographing distance corresponding to a second photographing distance area on a shorter distance side than the first photographing distance area, the lens control method comprising:

detecting a rotation angle of the ring; and

controlling a position in an optical axis direction of the focusing lens by selecting the first relationship or second relationship in accordance with a rotation angle of the ring and calculating a value relating to a photographing distance in accordance with a rotation angle of the ring.

9. The lens control method according to claim 8 ,

wherein in the second relationship, an amount of change in a value relating to a photographing distance to a rotation angle of the ring is larger than that in the first relationship.

10. The lens control method according to claim 8 ,

wherein in the second relationship, a shortest distance at which focusing by the focusing lens is possible is different depending on the zoom position.

11. The lens control method according to claim 8 , comprising:

switching the ring to a plurality of positions in an optical axis direction; and

executing control of a position in an optical axis direction of the focusing lens in a case where the ring is set at a predetermined position.

12. The lens control method according to claim 8 , comprising:

switching a control mode of performing control in accordance with a relative rotation position of the ring and a control mode of performing control in accordance with an absolute rotation position of the ring according to a plurality of positions in an optical axis direction; and

executing control of a position in an optical axis direction of the focusing lens in a case where the control mode of performing control in accordance with an absolute rotation position of the ring is selected.