Photographing apparatus
地域：
Tokyo
摘要
A photographing apparatus includes a photographing optical system having a diaphragm and a photographing lens; an image sensor; a driver which drives a shake-correction member in a plane orthogonal to the optical axis to make the object-emanating light rays incident on pixels of the image sensor that have different in detection colors to obtain an optical low-pass filter effect, wherein the image sensor and/or a lens element-constitutes the shake-correction member; a retriever which retrieves information on an aperture diameter of the diaphragm and on a resolving power of the photographing lens; and a drive controller which varies a range of the pixels, having different detection colors and on which the object-emanating light rays are incident, in accordance with the information on the aperture diameter of the diaphragm and/or on the resolving power of the photographing lens to vary the optical low-pass filter effect.
說明書
The present invention relates to a photographing apparatus capable of obtaining an optical low-pass filter effect without the use of an optical low-pass filter.
Image sensors (image pickup devices) for use in photographing apparatuses such as digital still cameras, digital video cameras, or the like, sometimes create moiré and false color, etc., that do not originally exist on an object if light rays emanating from the object contain components of spatial frequency that exceeds the limit spatial frequency of the image sensor. To reduce the occurrence of such phenomena, an optical low-pass filter is conventionally used. On the other hand, if an optical low-pass filter is used, resolving power, a sense of resolution and contrast deteriorate.
Whereas, an optical low-pass filter (Patent Literature 1) and a digital camera (Patent Literature 2) have been proposed as technologies for preventing moiré and false color, etc., from occurring without the use of a low-pass filter. The optical low-pass filter is provided with an variable apex-angle prism which is disposed in a photographing optical system and an exciting driver which excites and drives the variable apex-angle prism to vary the direction of object-emanating light rays which emerge from the variable apex-angle prism, wherein the optical low-pass filter is capable of obtaining optical low-pass filter effect by varying the direction of the object-emanating light rays by exciting the variable apex-angle prism, and the digital camera obtains an optical low-pass filter effect by receiving the object-emanating light rays via a plurality of pixels while moving an image sensor along a predetermined path.
權(quán)利要求
The invention claimed is:1. A photographing apparatus comprising:a photographing optical system having a diaphragm and a photographing lens; an image sensor, to which an object image that is formed from object-emanating light rays that have passed through said photographing optical system is exposed, a driver configured to drive a shake-correction member in a plane intersecting an optical axis of said photographing optical system to make said object-emanating light rays incident on a plurality of pixels of said image sensor which are mutually different in detection color, wherein at least one of said image sensor and a lens element constituting a portion of said photographing optical system constitutes said shake-correction member; a retriever configured to retrieve information on an aperture diameter of said diaphragm and information on a resolving power of said photographing lens; and a drive controller configured to drive said shake correction member along a predetermined path, in accordance with at least one of said information on said aperture diameter of said diaphragm and said information on said resolving power of said photographing lens that are retrieved by retriever. 2. The photographing apparatus according to claim 1 , wherein said drive controller is configured to vary said predetermined path, in accordance with said information on said aperture diameter of said diaphragm and said information on said resolving power of said photographing lens, which are provided by said retriever. 3. The photographing apparatus according to claim 1 , wherein, as said resolving power of said photographing lens that said retriever retrieves increases, said drive controller enlarges a range of said pixels of said image sensor, on which said object-emanating light rays are incident, andas said resolving power of said photographing lens that said retriever retrieves decreases, said drive controller narrows said range of said pixels of said image sensor, on which said object-emanating light rays are incident. 4. The photographing apparatus according to claim 3 , wherein said drive controller does not drive said driver when a Rayleigh resolution limit which corresponds to said resolving power of said photographing lens that said retriever retrieves is greater than a pixel pitch of said image sensor. 5. The photographing apparatus according to claim 1 , further comprising a low-pass filter operator,wherein said driver can oscillate said image sensor along linear paths in two orthogonal directions that are parallel to alignment directions of said pixels of said image sensor which are orthogonal to each other, and wherein said low-pass filter operator comprises a direction selection switch which is operated to make said image sensor oscillate only in one of said two orthogonal directions. 6. The photographing apparatus according to claim 1 , wherein said driver comprises a stage apparatus which includes:a fixed support board; a movable stage to which said image sensor is fixed and which is slidable with respect to said fixed support board; a magnet which is fixed to a surface of said fixed support board which faces said movable stage; a yoke of a magnetic material which is fixed to said fixed support board to face said magnet with said movable stage positioned between said yoke and said magnet to form a magnetic circuit between said yoke and said magnet; and a drive coil which is fixed to said movable stage and generates a driving force by receiving an electric current within a magnetic field of said magnetic circuit, wherein applying an AC voltage to said drive coil causes said movable stage to move. 7. The photographing apparatus according to claim 6 , wherein said stage apparatus comprises a magnetic driver which includes more than one of said magnet, more than one of said yoke, and more than one of said coil which move said movable stage independently in two orthogonal directions parallel to alignment directions of said pixels of said image sensor which are orthogonal to each other. 8. The photographing apparatus according to claim 1 , wherein said driver moves said image sensor along a circular path having a predetermined radius, andsaid drive controller is configured to vary the predetermined radius of said circular path. 9. The photographing apparatus according to claim 1 , wherein said driver moves said image sensor along a square path, each side of which has a predetermined length, andsaid drive controller is configured to vary said predetermined length of said square path. 10. A photographing apparatus comprising:a photographing optical system having a diaphragm and a photographing lens; an image sensor, to which an object image that is formed from object-emanating light rays that have passed through said photographing optical system is exposed; a driver configured to drive a shake-correction member in a plane intersecting an optical axis of said photographing optical system to make said object-emanating light rays incident on a plurality of pixels of said image sensor which are mutually different in detection color, wherein at least one of said image sensor and a lens element constituting a portion of said photographing optical system constitutes said shake-correction member; a retriever configured to retrieve information on an aperture diameter of said diaphragm and information on a resolving power of said photographing lens; and a drive controller configured to vary a range of said pixels, which are mutually different in detection color and on which said object-emanating light rays are incident, in accordance with at least one of said information on said aperture diameter of said diaphragm and said information on said resolving power of said photographing lens that are retrieved by said retriever, wherein, as said aperture diameter of said diaphragm that said retriever retrieves increases, said drive controller enlarges said range of said pixels of said image sensor, on which said object-emanating light rays are incident, and as said aperture diameter of said diaphragm that said retriever retrieves decreases, said drive controller narrows said range of said pixels of said image sensor, on which said object-emanating light rays are incident. 11. The photographing apparatus according to claim 10 , wherein said drive controller does not drive said driver when a Rayleigh resolution limit which corresponds to said aperture diameter of said diaphragm that said retriever retrieves is greater than a pixel pitch of said image sensor. 12. The photographing apparatus according to claim 10 , wherein said driver moves said image sensor along a circular path having a predetermined radius, andsaid drive controller is configured to vary the predetermined radius of said circular path. 13. The photographing apparatus according to claim 10 , wherein said driver moves said image sensor along a square path, each side of which has a predetermined length, andsaid drive controller is configured to vary said predetermined length of said square path. 14. A photographing apparatus comprising:a photographing optical system having at least a diaphragm and a photographing lens; an image sensor, to which an object image that is formed from object-emanating light rays passed through said photographing optical system is exposed, and which converts said object image thus exposed into an electrical pixel signal; a driver which drives a shake-correction member in a plane orthogonal to an optical axis of said photographing optical system to make said object-emanating light rays incident on a plurality of pixels of said image sensor which are mutually different in detection color to thereby obtain an optical low-pass filter effect, wherein at least one of said image sensor and a lens element constituting a portion of said photographing optical system constitutes said shake-correction member; a retriever which retrieves information on an aperture diameter of said diaphragm and information on a resolving power of said photographing lens; and a drive controller which varies a range of said pixels, which are mutually different in detection color and on which said object-emanating light rays are incident, in accordance with at least one of said information on said aperture diameter of said diaphragm and said information on said resolving power of said photographing lens that are retrieved by said retrieving portion to vary said optical low-pass filter effect, which is provided by said driver, wherein said driver can oscillate said image sensor along linear paths in two orthogonal directions that are parallel to alignment directions of said pixels of said image sensor which are orthogonal to each other, and wherein said low-pass filter operator comprises a direction selection switch which is operated to make said image sensor oscillate only in one of said two orthogonal directions. 15. The photographing apparatus according to claim 14 , wherein said driver comprises a stage apparatus which includes:a fixed support board; a movable stage to which said image sensor is fixed and which is slidable with respect to said fixed support board; a magnet which is fixed to a surface of said fixed support board which faces said movable stage; a yoke of a magnetic material which is fixed to said fixed support board to face said magnet with said movable stage positioned between said yoke and said magnet to form a magnetic circuit between said yoke and said magnet; and a drive coil which is fixed to said movable stage and generates a driving force by receiving an electric current within a magnetic field of said magnetic circuit, wherein applying an AC voltage to said drive coil causes said movable stage to move. 16. The photographing apparatus according to claim 15 , wherein said stage apparatus comprises a magnetic driver which includes more than one of said magnet, more than one of said yoke, and more than one of said coil which move said movable stage independently in two orthogonal directions parallel to alignment directions of said pixels of said image sensor which are orthogonal to each other. 17. The photographing apparatus according to claim 14 , wherein said driver moves said image sensor along a circular path having a predetermined radius, andwherein said drive controller varies said predetermined radius to provide said optical low-pass filter effect. 18. The photographing apparatus according to claim 14 , wherein said driver moves said image sensor along a square path, each side of which has a predetermined length, andwherein said drive controller varies said predetermined length to provide said optical low-pass filter effect. 19. The photographing apparatus according to claim 14 , wherein, as said aperture diameter of said diaphragm that said retriever retrieves increases, said drive controller enlarges said range of said pixels of said image sensor, on which said object-emanating light rays are incident, that are mutually different in detection color to enhance said optical low-pass filter effect that is provided by said driver, andwherein, as said aperture diameter of said diaphragm that said retriever retrieves decreases, said drive controller narrows said range of said pixels of said image sensor, on which said object-emanating light rays are incident, that are mutually different in detection color to weaken said optical low-pass filter effect that is provided by said driver. 20. The photographing apparatus according to claim 14 , wherein, as said resolving power of said photographing lens that said retrieving portion retrieves increases, said drive controller enlarges said range of said pixels of said image sensor, on which said object-emanating light rays are incident, that are mutually different in detection color to enhance said optical low-pass filter effect that is provided by said driver, andwherein, as said resolving power of said photographing lens that said retriever retrieves decreases, said drive controller narrows said range of said pixels of said image sensor, on which said object-emanating light rays are incident, that are mutually different in detection color to weaken said optical low-pass filter effect that is provided by said driver.
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