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US 5,597,999 AGranted
Auto focus detecting device comprising both phase-difference detecting and contrast detecting methods
AssigneeMinolta Co., Ltd.
InventorsAkio Kinba, Masataka Hamada, Hiroshi Ueda, Kazumi Sugitani, Hiroshi Ootsuka
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Abstract
An auto focus detecting device capable of focus detection by a contrast detecting method and a phase-difference detecting method. In accordance with a condition of an object, either one of detecting method is selected, and then an amount of defocus is calculated based on a result obtained by the selected detecting method.
Claims20
An auto focus detecting device comprising;
- first image pick up means which converts an object image formed on an imaging face to an electric signal;
- first detecting means which detects focus condition by a phase-difference detecting method based on output from the first image pick up means;
- second image pick up means which converts the object image formed on the imaging face to an electric signal;
- second detecting means which detects focus condition by a contrast detecting method based on an output from the second image pick up means;
- and
- calculating means which calculates an amount of defocus based on output from the first detecting means and the second detecting means.
3 more elements
An auto focus detecting device comprising;
- first image pick up means which converts an object image formed on an image pick up face to an electric signal;
- first detecting means which detects a focus condition by a phase-difference detecting method based on an output from the first image pick up means;
- second image pick up means which converts an object image formed on an imaging face to an electric signal;
- second detecting means which detects a focus condition by a contrast detecting method based on an output from the second image pick up means;
- judging means which judges whether or not the first detecting means can detect a focus condition by phase-difference detecting method;
- and
- calculating means which calculates an amount of defocus based on output from the second detecting means, when the judging means judges that the focus condition can not be detected by the first detecting means.
4 more elements
An auto focus detecting device comprising;
- first image pick up means which converts an object image formed on an imaging face to an electric signal;
- first detecting means which detects a focus condition by a phase-difference detecting method based on an output from the first image pick up means;
- second image pick up means which converts an object image formed on an imaging face to an electric signal;
- second detecting means which detects a focus condition by a contrast detecting method based on output from the second image pick up means;
- judging means which judges whether or not the second detecting means can detect the focus condition by the contrast detecting method;
- and
- calculating means which calculates an amount of defocus based on an output from the first detecting means, when the judging means judges that the focus condition can not be detected by the second detecting means.
4 more elements
An auto focus adjusting device comprising:
- a photosensor which converts an object image formed on a light-receiving surface to an electric signal;
- a first detecting device which detects a focus condition by a phase-difference detecting method based on an output from the photosensor;
- a second detecting device which detects a focus condition by a contrast detecting method based on an output from the photosensor;
- and
- an adjusting device which adjusts the focus condition based on output from the first detecting device and the second detecting device.
2 more elements
An auto focus adjusting device comprising:
- a photosensor which converts an object image formed on a light-receiving surface to an electric signal;
- a first detecting device which detects a focus condition by a phase-difference detecting method based on an output from the photosensor;
- a second detecting device which detects a focus condition by a contrast detecting method based on an output from the photosensor;
- a judging device which judges whether or not the first detecting device can detect a focus condition by the phase-difference detecting method;
- and
- an adjusting device which adjusts the focus condition based on output from the second detecting device when the judging device judges that the first detecting device cannot detect the focus condition.
3 more elements
An auto focus adjusting device comprising:
- a photosensor which converts an object image formed on a light-receiving surface to an electric signal;
- a first detecting device which detects a focus condition by a phase-difference detecting method based on an output from the photosensor;
- a second detecting device which detects a focus condition by a contrast detecting method based on an output from the photosensor;
- a judging device which judges whether or not the second detecting device can detect a focus condition by the contrast detecting method;
- and
- an adjusting device which adjusts the focus condition based on output from the first detecting device when the judging device judges that the second detecting device cannot detect the focus condition.
3 more elements
Dependencies are inferred from the claim text.