Canon Kabushiki Kaisha

Motoya Takai

Kyoji Sekiguchi

Shinya Tanaka

Hiroshi Itoh

Manabu Wada

Toshifumi Masaki

Kazuhiro Matsumoto

Hajime Nakajima

Hiroshi Nishihara

Takashi Masuda

Masao Shikaumi

Takeshi Kitamura

Tetsuji Ogawa

Yoshimi Kohayakawa

Hiroki Uchida

Shigeaki Ono

Yasuhiro Nakahara

An ophthalmologic apparatus includes a tomographic image acquisition unit configured to acquire a tomographic image of a subject's eye based on a combined beam obtained by combining a return beam from the subject's eye, which is irradiated with a measuring beam, and a reference beam corresponding to the measuring beam, an optical path length difference changing unit configured to change an optical path length difference between the measuring beam and the reference beam, and a control unit configured to, in a case where relative positions of an optical system for irradiating the subject's eye with the measuring beam and an anterior segment of the subject's eye satisfy a predetermined condition based on an image of the anterior segment, control the optical path length difference changing unit so that the optical path length difference is within a predetermined range.

Ophthalmologic apparatus

A medical system includes an acquisition unit configured to acquire a tomographic image of an object to be examined based on a combined beam generated by combining a return beam returning from the object to be examined illuminated with a measuring beam and a reference beam corresponding to the measuring beam, a focus position changing unit configured to change a focus position on the object to be examined; an optical-path-length difference changing unit configured to change a difference in optical path lengths between the measuring beam and the reference beam, and a control unit configured to control the optical-path-length difference changing unit so that the difference in the optical path length is within a predetermined range and then receive an instruction to the focus position changing unit to make a change.

Medical system

A camera, which is removably mountable on an ophthalmologic photographing apparatus including an illumination optical system configured to illuminate a subject's eye with illumination light, includes an imaging unit configured to form an image from return light from the subject's eye through a photographing optical system in the ophthalmologic photographing apparatus, a development unit configured to develop a moving image or a still image of the subject's eye based on an output signal from the imaging unit with using a development parameter based on a wavelength range of the illumination light, and a display unit configured to display the moving image or the still image developed by the development unit.

Ophthalmologic photographing apparatus and camera for use in ophthalmologic photographing

A fundus image is displayed, which enables accurate positioning and focusing to be easily performed with respect to an eye to be examined even on a small display unit by selecting a display magnification. At a first display magnification, an opening portion 'm' of a mask specifying a predetermined angle of field of the fundus is displayed with no part missed in both of horizontal and vertical directions of a display unit. At a second display magnification, the opening 'm' of the mask is displayed with no part missed in the horizontal direction in the display area of the display unitand with some part missed in the vertical direction. Thus, the second display magnification is used to observe an essential part when the fundus is accurately observed.

Fundus imaging apparatus and method therefor

An ophthalmologic photographing apparatus includes a light source configured to emit photographing light for illuminating a subject's eye through an illumination optical system, a changing unit configured to change a light emission amount of the light source, a selecting unit configured to select at least one of a plurality of photographing modes for photographing the subject's eye, a storage unit configured to store the changed light emission amount by the changing unit as a changed value during the photography in the photographing mode selected by the selecting unit, and a setting unit configured to set a light emission amount at a start of the photography to a light emission amount which is set beforehand as an initial state of the light source or to the changed value according to the plurality of photographing modes.

Ophthalmologic photographing apparatus, and its photographing method

An ophthalmologic photographing apparatus includes an optical system, a pedestal, an auxiliary lens configured to be able to be inserted into and retracted from the optical system, a focusing lens, a focusing lens driving unit configured to move the focusing lens along an optical axis, a pedestal position detection unit configured to detect that the pedestal is away from the subject's eye by a predetermined distance, an auxiliary lens insertion detection unit configured to detect that the auxiliary lens is inserted into the optical system, a storage unit configured to store a position of the focusing lens, and a control unit configured to cause the focusing lens driving unit to move the focusing lens to a predetermined position stored in the storage unit based on outputs from the pedestal position detection unit and the auxiliary lens insertion detection unit.

Ophthalmologic photographing apparatus

A fundus camera includes an optical path splitting unit arranged between a focusing unit and an imaging unit. The splitting unit has characteristics adapted to reflect light of a visible light region and to transmit near-infrared light. The splitting unit retreats from an optical path when a still fundus image is photographed. A quick-return mirror having such characteristics is used as the splitting unit. When near-infrared illumination light having a wavelength of about 850 nm is used, such light can be incident upon the imaging unit without loss of the amount of light. Visible light output from an internal fixation target is projected onto a subject's eye. A cornea diaphragm and a crystalline lens diaphragm are used for observing a fundus with invisible light. Each of the cornea diaphragm and crystalline lens diaphragm can be changed to another one having a different diameter.

Fundus camera

A fundus camera that obtains focus evaluation values by scanning, in which a focusing lens moves a predetermined distance according to a photographing mode before the focusing lens starts scanning for obtaining focus evaluation values.

A fundus camera includes an observation photographing unit having a focusing lens to perform focusing of an imaging unit on a fundus of a subject's eye, a lens driving unit configured to drive the focusing lens in an optical axis direction, and a focusing control unit configured to calculate a focusing evaluation value based on image information of a predetermined area of a fundus image captured by the observation photographing unit, and drive the focusing lens based on the focusing evaluation value, thereby performing focusing, wherein the focusing control unit moves the focusing lens from a previous photographing position of the focusing lens by a predetermined moving amount, and then performs the focusing.

A fixed target position which is synthesized and outputted is shifted to a correct position of a display device in accordance with an image pickup magnification of an eye to be examined. A state in which the imaging lens is moved to change an imaging magnification of an eye fundus image Pr of an eye to be examined E is indicated. If an image is magnified, the state wherein a mark Mand a substantial center of a macular portion Po of the eye to be examined coincide with each other may change to the state wherein the macular portion Po is deviated from the mark M. In such case, with respect to a shifting distance of the mark Mrequired at this time, in the case where the position of the mark Mis located at a distance of 'a' from a center, when an image pickup magnification is n times, it is n&#xb7;a from the center.

Growing community of inventors

Nagareyama, Japan

Motoya Takai