JP2007334143A5

JP2007334143A5 -

Info

Publication number: JP2007334143A5
Application number: JP2006167719A
Authority: JP
Filing date: 2006-06-16
Publication date: 2009-07-23

Claims

An interchangeable lens digital camera comprising a camera body and an interchangeable lens that can be attached to and detached from the camera body,
The interchangeable lens
A focus lens to adjust the focus position;
Lens storage means for storing information relating to the characteristics of the interchangeable lens;
Lens communication means for transmitting and receiving information;
Have
The camera body
Camera body communication means for transmitting / receiving information to / from the lens communication means in the interchangeable lens;
An image sensor that converts a light image formed by the interchangeable lens into an electrical image signal;
Evaluation value calculation means for calculating a focus evaluation value representing the degree of focus of the optical image based on the image signal;
A focus control means for controlling the focus by controlling the movement of the focus lens so that the focus evaluation value is maximized;
Lens determining means for determining whether or not the interchangeable lens is suitable for movement control of the focus lens by the focus control means based on information on the characteristics of the interchangeable lens acquired via the camera body communication means;
When the lens determining unit determines that the interchangeable lens is suitable for the focus lens movement control by the focus control unit, the focus control unit controls the movement of the focus lens by a first focusing sequence. When the lens determination unit determines that the interchangeable lens is not suitable for the movement control of the focus lens by the focus control unit, the focus control unit performs the focus by the second focus sequence. Sequence switching means for controlling movement of the lens;
Interchangeable lens digital camera, characterized by comprising.

The lens determination unit includes a focusing time estimation unit that estimates a time required for focusing by the focus lens movement control performed by the focusing control unit.
The lens determination means determines that the interchangeable lens is not suitable for movement control of the focus lens by the focus control means when the time estimated by the focus time estimation means is longer than a predetermined time. The interchangeable-lens digital camera according to claim 1.

The movement of the focus lens is performed based on the drive pulse,
The information on the lens characteristics of the interchangeable lens is the number of drive pulses that is the number of drive pulses necessary to move the focus lens from infinity to a close distance of the interchangeable lens, and the focus lens per drive pulse. 3. The interchangeable lens digital camera according to claim 1 , comprising at least one of a moving distance, a driving pulse interval that is a time interval between driving pulses, and a maximum number of driving pulses per unit time . 4.

2. The interchangeable lens digital camera according to claim 1 , wherein the information on the lens characteristics of the interchangeable lens is information for specifying a type of the interchangeable lens .

2. The interchangeable lens digital camera according to claim 1 , wherein the information regarding the lens characteristics of the interchangeable lens is a flag indicating whether or not the interchangeable lens is suitable for focusing control by the focusing control means. .

The lens determining means includes a notifying means for notifying the user of the interchangeable lens digital camera when it is determined that the interchangeable lens is not suitable for focusing control by the focusing control means. The interchangeable-lens digital camera according to claim 1 .

The focus control means controls the movement of the focus lens in steps,
When the lens determining unit determines that the interchangeable lens is not suitable for movement control by the focusing unit, the focusing control unit controls the movement of the interchangeable lens by the focusing unit. 2. The lens interchangeable type according to claim 1, wherein the movement control of the focus lens is performed so that a movement amount of the focus lens per unit step is larger than a case where it is determined that the focus lens is suitable. Digital camera.

When the lens determination means determines that the interchangeable lens is not suitable for movement control by the focusing means,
The focus control means continuously moves the focus lens, and performs movement control of the focus lens based on a focus evaluation value acquired by the evaluation value calculation means at a predetermined cycle during the movement. The interchangeable-lens digital camera according to claim 1.

In the second focusing sequence, first, the focus lens is roughly adjusted to the vicinity of the focus lens position where the focus evaluation value is maximized, and then the focus evaluation value is maximized. 2. The interchangeable-lens digital camera according to claim 1, wherein the digital camera is a two-step sequence for fine adjustment to a lens position .

An interchangeable-lens digital camera in which an interchangeable lens having a focus lens for adjusting a focal position is removable.
A communication means for transmitting / receiving information to / from the interchangeable lens;
An image sensor that converts a light image formed by the interchangeable lens into an electrical image signal;
Evaluation value calculation means for calculating a focus evaluation value representing the degree of focus of the optical image based on the image signal;
Focus control means for controlling the focus by controlling the movement of the focus lens of the interchangeable lens via the communication means so that the focus evaluation value is maximized;
Lens determining means for determining whether or not the interchangeable lens is suitable for movement control of the focus lens by the focus control means based on information on the characteristics of the interchangeable lens acquired from the interchangeable lens via the communication means When,
When the lens determining unit determines that the interchangeable lens is suitable for the focus lens movement control by the focus control unit, the focus control unit controls the movement of the focus lens by a first focusing sequence. When the lens determination unit determines that the interchangeable lens is not suitable for the movement control of the focus lens by the focus control unit, the focus control unit performs the focus by the second focus sequence. Sequence switching means for controlling movement of the lens;
An interchangeable lens type digital camera comprising:

The lens determination unit includes a focusing time estimation unit that estimates a time required for focusing by the focus lens movement control performed by the focusing control unit .
The lens determining means determines that the interchangeable lens is not suitable for movement control of the focus lens by the focus control means when the time estimated by the focus time estimating means is longer than a predetermined time. The interchangeable-lens digital camera according to claim 10.

The movement of the focus lens is performed based on the drive pulse ,
The information on the lens characteristics of the interchangeable lens is the number of drive pulses that is the number of drive pulses necessary to move the focus lens from infinity to a close distance of the interchangeable lens, and the focus lens per drive pulse. travel distance, a driving pulse drive pulse interval is the time interval between, and a lens interchangeable digital according to claim 10 or claim 11, characterized in that it comprises at least one of the maximum number of drive pulses per unit time camera.

The information about the lens characteristics of the interchangeable lens, the lens-interchangeable digital camera according to claim 1 0, characterized in that the information for specifying the type of the interchangeable lens.

The information about the lens characteristics of the interchangeable lens, the lens-interchangeable digital claim 1 0 in which the interchangeable lens is characterized in that it is a flag indicating whether or not suitable for focusing control by the focus control means camera.

The lens determining means includes a notifying means for notifying the user of the interchangeable lens digital camera when it is determined that the interchangeable lens is not suitable for focusing control by the focusing control means. interchangeable lens digital camera according to claim 1 0, characterized.

The focus control means controls the movement of the focus lens in steps,
When the lens determining unit determines that the interchangeable lens is not suitable for movement control by the focusing unit, the focusing control unit controls the movement of the interchangeable lens by the focusing unit. The lens interchangeable type according to claim 10, wherein the focus lens movement control is performed so that a movement amount of the focus lens per unit step is larger than a case where it is determined that the focus lens is suitable. Digital camera.

When the lens determination means determines that the interchangeable lens is not suitable for movement control by the focusing means,
The focus control means continuously moves the focus lens, and performs movement control of the focus lens based on a focus evaluation value acquired by the evaluation value calculation means at a predetermined cycle during the movement. The interchangeable-lens digital camera according to claim 10.

In the second focusing sequence, first, the focus lens is roughly adjusted to the vicinity of the focus lens position where the focusing evaluation value is maximized, and then the focusing evaluation value is maximized. The interchangeable-lens digital camera according to claim 10, wherein the digital camera is a two-step sequence for fine adjustment to a lens position.