JP2006276607A5

JP2006276607A5 -

Info

Publication number: JP2006276607A5
Application number: JP2005097330A
Authority: JP
Filing date: 2005-03-30
Publication date: 2008-05-01

Claims

A focus detection device that respectively detects focus adjustment states in a plurality of focus areas set in an image plane by an objective lens including a focusing lens ;
In an autofocus device comprising: a focus adjustment unit that drives the focusing lens based on the detected focus adjustment states of the plurality of focus areas and focuses the target object.
Based on at least one of the focal length of the objective lens and the distance to the object to be focused, area determining means for determining validity / invalidity of the specific area of the plurality of focus areas;
The focus adjustment unit drives the focusing lens based on the focus adjustment state of other focus areas excluding the specific area when the specific area is invalid, and when the specific area is valid, An autofocus device, wherein the focusing lens is driven based on a focus adjustment state of the specific area and the other focus area.

A focus detection device that respectively detects focus adjustment states in a plurality of focus areas set in an image plane by an objective lens including a focusing lens ;
In an autofocus device comprising: a focus adjustment unit that drives the focusing lens based on the detected focus adjustment states of the plurality of focus areas and focuses the target object.
If focus detection is possible in at least one area of the plurality of focus areas excluding the specific area, the specific area is invalidated, and if focus detection is impossible in all areas except the specific area, the specific area Having an area determination means for validating the area;
The focus adjustment unit drives the focusing lens based on the focus adjustment state of other focus areas excluding the specific area when the specific area is invalid, and when the specific area is valid, An autofocus device, wherein the focusing lens is driven based on a focus adjustment state of the specific area and the other focus area.

A focus detection device that respectively detects focus adjustment states in a plurality of focus areas set in an image plane by an objective lens including a focusing lens ;
In an autofocus device comprising: a focus adjustment unit that drives the focusing lens based on the detected focus adjustment states of the plurality of focus areas and focuses the target object.
If focus detection is possible in at least one area excluding the specific area of the plurality of focus areas, the specific is based on at least one of the focal length of the objective lens and the distance to the object to be focused If the area is determined to be valid / invalid, and focus detection is impossible in all areas except the specific area, the area determination means for validating the specific area,
The focus adjustment unit drives the focusing lens based on the focus adjustment state of other focus areas excluding the specific area when the specific area is invalid, and when the specific area is valid, An autofocus device, wherein the focusing lens is driven based on a focus adjustment state of the specific area and the other focus area.

Computation means for computing magnification based on the focal length of the objective lens and the distance to the object to be focused is further provided, and the area determination means invalidates the specific area if the magnification is equal to or less than a predetermined threshold. 4. The autofocus device according to claim 1, wherein the specific area is validated when the magnification exceeds a predetermined threshold.

A specific area determining means for determining one or a plurality of focus areas as the specific area from the plurality of focus areas;
5. The autofocus device according to claim 1, wherein the area determination unit determines whether the specific area determined by the specific area determination unit is valid or invalid.

6. The specific area determining means, when the plurality of focus areas are set in a plurality of columns, determines one or a plurality of rows of focus areas as the specific area. Autofocus device.

The said specific area determination means determines the focus area of one line or several lines as a specific area, when the said several focus area is comprised making a several line, The specific area is characterized by the above-mentioned. Autofocus device.

The autofocus device according to any one of claims 5 to 7, wherein the specific area determining means can change a specific area to be determined.

6. The apparatus according to claim 5, further comprising an attitude detection device that detects an attitude of the autofocus device, wherein the specific area determination unit changes an area to be determined according to a detection result of the attitude of the attitude detection device. The autofocus device according to any one of -8.