Device detecting focus of a taking lens without decrease in focus detection accuracy when the auto focus area is disposed at an inclination relative to the photographic field
AssigneeMinolta Co., Ltd.
InventorsAkio Kinba, Hiroshi Ueda, Iwao Ishida, Masataka Hamada
Life of this patent
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Abstract
An optical element disposed behind a main mirror and inclined relative to the optical axis is arranged at a position to correct aberration in the luminous flux generated by transmission through the main mirror.
Claims10
A focus detecting device for detecting the focus of a taking lens using the luminous flux of a focus detection area disposed at an inclination relative to the photographic field, comprising:
- a first optical element for transmitting luminous flux transmitted through the taking lens and disposed at an inclination relative to an optical axis behind the taking lens;
- and
- a second optical element arranged at a position for correcting aberration generated by luminous flux transmitted through the first optical element and disposed behind the first optical element.
A focus detecting device for detecting the focus of a taking lens using the luminous flux of a focus detection area disposed at an inclination relative to the photographic field, comprising:
- a first optical element for transmitting luminous flux transmitted through the taking lens and disposed at an inclination relative to an optical axis behind the taking lens;
- and
- a second optical element disposed at an inclination relative to the optical axis and disposed behind the first optical element,
- wherein the second optical element is provided with a first surface through which enters the luminous flux transmitted through the first optical element, and a second surface for reflecting the luminous flux transmitted through the first surface.
A focus detecting device for detecting the focus of a taking lens using the luminous flux of a focus detection area disposed at an inclination relative to the photographic field, comprising:
- a first optical element for transmitting luminous flux transmitted through the taking lens and disposed at an inclination relative to an optical axis behind the taking lens;
- and
- a second optical element for transmitting light transmitted through the first optical element and disposed at an inclination in the opposite direction of the first optical element.
Dependencies are inferred from the claim text.