Fundus camera

摘要

In a photographing optical system, an autofluorescence barrier filter having a characteristic of transmitting a light having an autofluorescence wavelength and a near-infrared wavelength, and a near-infrared light cut-off filter having a characteristic of transmitting the visible light and blocking the near-infrared light are disposed to be replaceable. In the case of observing a fundus, the fluorescence barrier filter is inserted into an optical path in an observation photographing optical system, so that observation can be performed by using a near-infrared illuminating light. In the case of autofluorescence photographing, the photographing can be performed without filter switching. In the case of color photographing, at the time of observation, the observation is performed using the fluorescence barrier filter, and at the time of photographing, the photographing can be performed using the replaced infrared light cut-off filter.

主权项

1. A fundus camera, comprising:
an illumination unit including a unit configured to illuminate a fundus of an eye to be examined with non-visible light to perform observation using the non-visible light and a unit configured to illuminate the fundus with a visible wavelength band and non-visible light to perform photographing using visible light; a fluorescence exciter filter disposed to be insertable in or removable from a first optical path between the illumination unit and the eye to be examined and configured to transmit light in a first portion of a fluorescence wavelength band; a first driving unit configured to drive insertion and removal of the fluorescence exciter filter from the first optical path; an observation photographing optical system configured to receive reflected light from the illuminated fundus and perform imaging of the fundus; an image capture unit having a sensitivity to a near-infrared wavelength band and a visible wavelength band and configured to perform moving image capturing and still image capturing; a second driving unit configured to drive replacement between a fluorescence barrier filter and an infrared light cut-off filter, which have characteristics of transmitting light in a second portion of the fluorescence wavelength band which is not overlapped with the first portion of the fluorescence wavelength band and light in the near-infrared wavelength band, respectively, in a second optical path of the observation photographing optical system; and a control unit configured to control the fluorescence exciter filter to be removed from the first optical path using the first driving unit and control the infrared light cut-off filter to be inserted into the second optical path using the second driving unit at the time of the photographing of color, and control the fluorescence exciter filter to be inserted into the first optical path using the first driving unit and control the fluorescence barrier filter to be inserted into the second optical path using the second driving unit at the time of the photographing of fluorescence, wherein, both at the time of the observation for photographing of color and at the time of the observation for photographing of fluorescence, the control unit controls the fluorescence exciter filter to be removed from the first optical path using the first driving unit and controls the fluorescence barrier filter to be inserted into the second optical path using the second driving unit.