JP2005099084A5

JP2005099084A5 -

Info

Publication number: JP2005099084A5
Application number: JP2003329456A
Authority: JP
Filing date: 2003-09-22
Publication date: 2007-04-12
Anticipated expiration: 2023-09-22

Claims

In a camera system capable of storing information on a specific shooting distance of a shooting lens and positioning the shooting lens at a shooting distance based on the stored information,
A deviation amount detecting means for detecting a deviation amount between an imaging surface of the photographing lens and a predetermined imaging surface at the specific photographing distance;
Correction means for correcting the specific shooting distance based on the shift amount;
And a control unit for positioning the photographing lens at the corrected photographing distance.

In a camera system that includes a photographic lens having a variable focal length, stores information about a specific photographic distance of the photographic lens, and can position the photographic lens at a photographic distance based on the stored information.
Calculating means for obtaining an imaging position at the specific shooting distance at a second focal length different from the first focal length at the time of storing the information;
And a control unit that positions the photographing lens at a photographing distance obtained by correcting the specific photographing distance based on the imaging position.

A deviation amount detecting means for detecting a deviation amount between an imaging plane of the photographing lens and a predetermined imaging plane at the specific shooting distance;
A first shift amount at the specific shooting distance at the first focal length is detected by the shift amount detection unit;
The calculation means obtains a second shift amount at the specific shooting distance at the second focal length based on the first and second focal lengths and the first shift amount,
The control means forms an imaging plane within the predetermined range when the second shift amount is not within a predetermined range where the photographic lens can be regarded as being in focus at the specific shooting distance. The camera system according to claim 2, wherein the specific shooting distance is corrected at a position.

4. The camera system according to claim 3, wherein the second shift amount is obtained based on a ratio of a variation amount of the imaging plane to a unit movement amount of the focus adjustment optical system and the first shift amount.

5. The camera according to claim 2 , wherein the calculation unit corrects a variation amount of the imaging position of the photographing lens with a change in the focal length with respect to the imaging position. 6. system.

The calculation means obtains an imaging position at the specific photographing distance at the second focal length in consideration of a focal movement amount accompanying a change in focal length of the photographing lens. The camera system according to claim 5.

In a camera system that includes a photographic lens having a variable focal length, stores information about a specific photographic distance of the photographic lens, and can position the photographic lens at a photographic distance based on the stored information.
A calculating means for obtaining a deviation of the imaging position at the specific shooting distance at a plurality of different focal lengths;
Correction means for correcting the specific shooting distance based on the deviation;
And a control unit for positioning the photographing lens at the corrected photographing distance.

A photographic lens having a focus adjustment optical system that performs focus adjustment by moving in the optical axis direction, and a variable magnification optical system that can change the focal length to a first focal length and a second focal length;
Driving means for driving the focusing optical system;
Position detecting means for detecting information relating to the position of the focusing optical system;
A deviation amount detecting means for detecting a deviation amount between an imaging position of the photographing lens and a predetermined imaging plane;
Storage means for storing information on the position of the focus adjustment optical system and the amount of deviation when the photographing lens is at a specific photographing distance at the first focal length;
At the second focal length, the shift amount between the imaging plane and the predetermined imaging plane when the photographic lens is at the specific shooting distance is stored as the first and second focal lengths. A calculation means for obtaining based on the deviation amount;
And a control means for controlling the drive means so as to drive the focus adjustment optical system to a position in the optical axis direction based on the deviation amount obtained by the calculation means and the stored information. Camera system.

  A focusing optical system that moves in the direction of the optical axis to adjust the focus;
  Position detecting means for detecting information relating to the position of the focusing optical system;
  Based on the detection result of the amount of deviation between the imaging position of the focus adjustment optical system and a predetermined image plane and the detection result of the position detection means, information on the position of the focus adjustment optical system is corrected, and the correction result is obtained. And a control means for controlling the focus adjusting optical system to move in the direction of the optical axis based on the lens barrel.

The lens barrel according to claim 9, further comprising a storage unit that stores a detection result of the position detection unit and a detection result of the shift amount.

  A photographic lens having a focus adjustment optical system that moves in the optical axis direction and performs focus adjustment; and a variable magnification optical system that moves in the optical axis direction and can change the focal length;
  Position detecting means for detecting information relating to the position of the focusing optical system;
  Calculating means for obtaining an imaging position of the photographing lens at a second focal length different from the first focal length when the position detecting means detects information on the position of the focus adjusting optical system;
  Control means for correcting information related to the position of the focus adjustment optical system based on the calculation result of the calculation means, and for moving the focus adjustment optical system in the optical axis direction based on the correction result. Lens barrel.

The computing means detects a first shift amount between the imaging position of the taking lens and a predetermined imaging plane at the first focal length, the first focal length, and the second focal point. 12. The lens barrel according to claim 11, wherein a second shift amount between the imaging position of the photographing lens and the predetermined imaging plane at the second focal length is obtained based on the distance. .

The lens barrel according to claim 12, further comprising storage means for storing a detection result of the position detection means and the first shift amount.

The lens barrel according to claim 12 or 13, wherein the control means determines whether or not the second shift amount is within a predetermined range that can be regarded as being in focus.

15. The lens barrel according to claim 12, wherein the control unit corrects information related to a position of the focus adjustment optical system when the second shift amount is not within the predetermined range. .

13. The calculation unit according to claim 12, wherein the second shift amount is obtained based on a ratio of a variation amount of the image plane to a unit movement amount of the focus adjustment optical system and the first shift amount. The lens barrel according to any one of 1 to 15.

The calculation means obtains an imaging position at the specific photographing distance at the second focal length in consideration of a focal movement amount accompanying a change in focal length. The lens barrel according to item 1.

The lens barrel according to claim 10, wherein the first focal length is shorter than the second focal length.

19. The ratio of the unit movement amount of the focus adjustment optical system to the fluctuation amount of the imaging plane and the focus movement amount due to the change of the focal length are stored. 19. Lens barrel.

  An optical system including a first lens group that moves on the optical axis and performs zooming; and a second lens group that moves on the optical axis and performs focus adjustment;
  Position detecting means for detecting positions of the first lens group and the second lens group;
  Lens driving means for driving the second lens group;
  Control means for driving and controlling the optical system based on the result of position detection;
  In a zoom lens system capable of storing information on a specific shooting distance of the optical system and positioning the optical system at a shooting distance based on the stored information,
  A zoom lens system, wherein a deviation of an imaging position at the specific shooting distance at a plurality of different focal lengths is obtained, and the specific shooting distance is corrected based on the deviation.