Nidek Co., Ltd.

Akira Tawada

Yoshiaki Mimura

Naoki Ichikawa

Masayuki Yoshino

Setsuo Saito

A fundus photographing apparatus has an optical system including a movable focusing lens and photographing a fundus, an optical system photo-receiving by a first image pickup element a target from an alignment target projection optical system and detect an alignment state of the photographing optical system with respect to an eye based on a result by the first element, a detection optical system photo-receiving by a second image pickup element a target from a focus target projection optical system and detect a focus state adjusted by moving the lens based on a photo-receiving result by the second element, a unit controlling a light source to successively emit flash light at predetermined intervals in a predetermined period to perform fluorescent photographing, and a unit controlling movement of the photographing optical system with respect to the eye based on a result by the alignment detection optical system during the predetermined period.

Fundus photographing apparatus

A fundus camera favorably performing focusing on a fundus of an examinee's eye without a black dot plate in a target projection optical system comprises an illumination optical system comprising a light source and an objective lens, a photographing optical system comprising a focusing lens movable in the optical axis direction and a diopter correction lens to correct a diopter of severe ametropia, a first moving mechanism comprising a first driving unit moving the focusing lens, a focus detection optical system comprising a projection optical system comprising a light source and a photo-receiving optical system comprising a photodetector, a second moving mechanism comprising a second driving unit moving a part of the detection optical system including at least one of the projection light source and the photodetector in the optical axis direction, a monitor, and a control unit controlling the second unit in conjunction with movement of the focusing lens.

Fundus camera

A fundus camera, of which usability is enhanced while offering an excellent combination of automatic and manual photographing, includes a photographing optical system having a photographing optical axis, a movable focusing lens and an image-pickup element, alignment-state detection means, focusing-state detection means, a fixation target presenting unit where a presenting position of a fixation target is changeable between a reference position for photographing a central portion and a peripheral position for photographing a peripheral portion, a photographing starting switch, means for switching between a manual mode in which photographing is performed based on a signal from the switch and an automatic mode in which photographing is automatically performed.

A fundus camera capable of favorably obtaining a photographed fundus image and an observation fundus image, has an optical system having an objective lens and a diaphragm at a conjugate position with a pupil relative to the lens, for performing visible photographing and infrared observation via the lens and an aperture of the diaphragm, an optical system for illumination with visible and infrared light via the lens, a first plate, with a first black dot to cover an aperture image and at a conjugate position on an optical path with a position where a virtual image is formed relative to a lens surface reflecting the visible light, and a second plate, with a second black dot to cover an aperture image and in the vicinity of a conjugate position on the path with a position where a virtual image is formed relative to the surface reflecting the infrared light.

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Gamagori, Japan

Akira Tawada