Patent ID: 8154796

Claim:
A microscope apparatus comprising: at least one observation scanning optical system including a laser light source for emitting observation laser light, an objective lens, and a scanning optical system for two-dimensionally scanning the observation laser light in a predetermined examination plane of a specimen via the objective lens; a detection optical system for detecting fluorescence produced by irradiating the specimen with the observation laser light; at least one stimulus optical system which includes a lamp light source for emitting light having a wavelength used for optical stimulation and a shutter in a light path between the lamp light source and the specimen, and which irradiates the specimen with the light emitted from the lamp light source; a light-path combining device for simultaneously guiding both the observation laser light and the light used for optical stimulation to the objective lens, the light-path combining device being provided between the objective lens and the shutter such that the microscope apparatus is capable of irradiating the specimen with the light used for optical stimulation emitted from the stimulus optical system via the objective lens by opening the shutter while the specimen is irradiated with the observation laser light via the objective lens and then detecting the fluorescence by the detection optical system, and the light combining device being adapted to combine the observation laser light with the light used for optical stimulation by transmitting one of the observation laser light and the light used for optical stimulation and reflecting the other; a focusing mechanism for adjusting a distance between the specimen and the objective lens; and a control unit for synchronously controlling the scanning optical system provided in the observation scanning optical system, the shutter provided in the stimulus optical system, and the focusing mechanism; wherein the control unit controls opening and closing of the shutter provided in the stimulus optical system in accordance with a scanning timing of the observation laser light by the observation scanning optical system, thereby enabling a response of the specimen to be observed by the detection optical system immediately after an optical stimulus applied by irradiation of the light used for optical stimulation emitted from the lamp light source; and wherein the detection optical system includes a filter for eliminating light in a wavelength band used for the optical stimulation.