JP2007011314A5

JP2007011314A5 -

Info

Publication number: JP2007011314A5
Application number: JP2006150686A
Authority: JP
Filing date: 2006-05-30
Publication date: 2009-06-04
Anticipated expiration: 2026-05-30

Claims

A microlens array having a plurality of microlenses arranged at a predetermined pitch on a plane deviated from a predetermined focal plane of the imaging optical system;
A plurality of light receiving unit arrays individually provided on the rear side of the plurality of microlenses constituting the microlens array ;
A first signal sequence {a (i); i = 1, 2, 3, 4,...} Is created from the photoelectric conversion output of the light receiving unit array provided in a certain microlens, and another microlens is formed. First creating means for creating a second signal sequence {b (i); i = 1, 2, 3, 4,...} From the photoelectric conversion output of the provided light receiving section array;
A process of extracting signals a (i) and b (i) from photoelectric conversion outputs of two light receiving units arranged at predetermined positions in the light receiving unit array provided in the i-th micro lens is performed for a plurality of micro lenses. The first signal sequence {a (i); i = 1, 2, 3, 4,...} And the second signal sequence {b (i); i = 1, 2, 3, 4,. A second creation means for creating
One of the pair of signal sequences created by the first creation unit and the pair of signal sequences created by the second creation unit is selected based on a predetermined criterion, and the selected pair of signal sequences is An imaging state detection device comprising: an imaging state calculation means for detecting an imaging state on the predetermined focal plane of the imaging optical system based on a deviation amount between a pair of patterns to be expressed .

In the imaging state detection device according to claim 1,
The arrangement pitch Pd of the light receiving portion images formed when the light receiving portion array is back-projected onto the planned focal plane is smaller than the arrangement pitch P of the microlenses.

In the imaging state detection device according to claim 1 or 2 ,
Wherein P the pitch of the microlenses, F value F _P of the light beam incident from said imaging optical system portion pupil to one of the light receiving unit, when the division number of the pupil of the imaging optical system and is Q, the The distance L from the arrangement plane of the microlens array to the planned focal plane satisfies the following formula.
P × F _P > L ≧ P × F _P / (Q-4)

In the imaging state detection apparatus according to any one of claims 1 to 3 ,
Multiple wherein the the plurality of light receiving portions array, a second direction different from the plurality of first light receiving unit array arrangement direction of the light receiving portion is the first direction, the arrangement direction of the light receiving portion is the first direction And a second light receiving section array .

The imaging state detection device according to claim 4 ,
The plurality of microlenses provided with the plurality of first light receiving unit arrays and the plurality of microlenses provided with the plurality of second light receiving unit arrays are arranged in a checkered pattern.

The imaging state detection device according to claim 4 ,
The plurality of first light receiving unit arrays and the plurality of second light receiving unit arrays are arranged in a checkered pattern.

The imaging state detection device according to claim 4 ,
The arrangement pitch of the micro lenses provided with the first light receiving section array is different from the arrangement pitch of the micro lenses provided with the second light receiving section array .

The imaging state detection device according to claim 4 ,
Wherein the length of the array direction of the first light receiving portion array, the length of the array direction of the second light receiving section arrays are different from each other.

In the imaging state detection device according to any one of claims 1 to 8 ,
Wherein the the plurality of light receiving portions array, there are a plurality kinds of light-receiving portion which have a different spectral sensitivity characteristics.

The imaging state detection device according to claim 4 ,
Wherein the the plurality of first light receiving section arrays, there are a plurality kinds of the first light receiving portion array have a different spectral sensitivity characteristics.

The imaging state detection device according to claim 9 ,
Among the plurality of types of light-receiving portion, the light receiving portion of the particular type that have a specific spectral sensitivity characteristics are densely arranged than other types of light receiving portions have a another spectral sensitivity characteristics.

In the imaging state detection device according to claim 10 ,
In each of the plurality of first light receiving portion array and the plurality of second light receiving section arrays, there is the light receiving section have a sensitivity to a specific wavelength.

In the imaging state detection device according to claim 11 or 12 ,
Among a plurality of types of light-receiving portions having different spectral sensitivity characteristics from each other, they have different sizes each other.

A camera incorporating the imaging state detection device according to any one of claims 1 to 13 as a focus detection device.

14. A light receiving unit comprising the microlens array and the light receiving unit array in the imaging state detection device according to claim 1 .