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Ken Utagawa: Focus detection apparatus. Nippon Kogaku, Shapiro and Shapiro, December 31, 1985: US04561749 (62 worldwide citation)

A focus detection apparatus has a pair of photoelectric element arrays, a plurality of filters having different MTF characteristics, and an operation unit. A filter is selected from the plurality of filters in accordance with an object or a focusing state. The selected filter filters the data from t ...


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Masataka Hamada: Focal position changeable spatial modulation unit and focus detection device. Minolta, Burns Doane Swecker & Mathis, April 15, 2003: US06549730 (43 worldwide citation)

A spatial modulator, a luminous flux deflector, a focus detection apparatus and a imaging device, which are capable of changing the focal position. The focus detection device includes: a focus sensor; liquid crystal cells that are arranged between a lens and the focus sensor and deflect luminous flu ...


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Toru Ishii, Masatoshi Itoh, Hidenori Fukuoka: In-focus detection apparatus using video signal. Minolta Camera Kabushiki Kaisha, Price Gess & Ubell, July 6, 1993: US05225940 (42 worldwide citation)

An in-focus detection apparatus used for a video camera includes edge width detector for detecting a plurality of edge widths of an object, and an calculation device for calculating the amount of driving a lens based on the distribution state of these plurality of edge width data. The apparatus uses ...


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Jun Tokumitsu, Masayoshi Sekine, Toshiaki Kondo, Koji Takahashi, Isao Harigaya, Minoru Yoshii, Shigeyuki Suda: Movement detection device and focus detection apparatus using such device. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, March 17, 1998: US05729290 (40 worldwide citation)

A movement detection device for detecting movement of an image incident on an image sensing device and for compensating for that movement includes movement detection circuitry for detecting the movement of the image from image signals output from the image sensing device. Correction circuitry is pro ...


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Yukihiro Shibata, Shunji Maeda, Hiroshi Makihara, Minoru Yoshida, Yasuhiko Nakayama, Kenji Oka: Automatic focus detection method, automatic focus detection apparatus, and inspection apparatus. Hitachi, Antonelli Terry Stout & Kraus, July 18, 2000: US06091075 (32 worldwide citation)

An automatic focus detection method comprises the steps of: irradiating onto a single spot of a sample a plurality of beams of illuminating light transmitted and condensed through an objective lens in a symmetrically diagonal manner with respect to an optical axis of the objective lens; branching re ...


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Kenji Suzuki: Multi-area focus detection apparatus for detecting focus either automatically or intentionally. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, October 3, 1995: US05455654 (29 worldwide citation)

Multi-area focus detection apparatus for detecting focus either automatically or intentionally includes focus detection structure for detecting focus information to a plurality of points within a photographing area formed by the objective lens. Automatic selection circuitry is provided for automatic ...


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Masafumi Yamasaki, Toshiyuki Toyofuku, Junichi Itoh, Shinichi Kodama: Focus detection apparatus using neural network means. Olympus Optical, Frishauf Holtz Goodman & Woodward, October 23, 1990: US04965443 (26 worldwide citation)

An optical image transmitted through a photographing lens is incident on a light-receiving unit of a two-dimensional matrix. An output from the light-receiving unit is input to a first arithmetic logic unit, and the first arithmetic logic unit calculates actual object brightness values in considerat ...


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Yasuo Suda, Akira Yamada, Yukio Odaka, Akira Akashi: Apparatus for detecting the focus adjusting state of an objective lens by performing filter processing. Canon Kabushiki Kaisha, Fitzpatrick Cella Harper & Scinto, November 22, 1994: US05367153 (23 worldwide citation)

A focus detection apparatus includes an optical system for forming first and second optical distributions associated with object images whose relative positional relationship is changed in accordance with an imaging state of an imaging optical system subjected to focus detection, a photoelectric con ...


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John S Winslow: Focus detector for an optical disc playback system. Discovision Associates, Ronald J Clark, November 2, 1982: US04357533 (22 worldwide citation)

Electro-optical focus detection apparatus for providing a signal indicative of the magnitude and polarity of focus error in a light beam impinging on a surface, such as a recording surface in a recording or playback system. The detector includes a beam splitter for dividing the beam reflected from t ...