Patent Number: 
Section: claims

1. A biological-specimen observation apparatus comprising:a stage on which a specimen is to be mounted, the stage being movable to a plurality of positions, wherein the specimen is a small laboratory animal;an objective lens, disposed opposing the stage, that collects observation light from the specimen;a first light source that emits illumination light and irradiates the specimen at an angle with respect to the stage from a side toward the objective lens without passing through the objective lens;a second light source that emits excitation light and irradiates the specimen through the objective lens, along a direction coaxial with the optical axis of the objective lens;an image-forming lens that forms an image from the observation light from the specimen, collected by the objective lens, wherein the observation light comprises a light returning from the specimen as a result of the illumination light and a fluorescence emitted from the specimen as a result of the excitation light;an image acquisition unit that acquires the image of the specimen, formed by the image-forming lens;a position detection unit that obtains a positional information of the stage;an image control unit that moves the stage to a plurality of positions and causes the image acquisition unit acquire the image at each of the plurality of positions;an image storage unit that stores a plurality of the images obtained by the image acquisition unit and the positional information obtained by the position detection unit, the plurality of the images and the positional information being associated to each other;an image processing unit that generates one combined image by combining the plurality of the images stored by the image storage unit on the basis of the positional information stored in association with the plurality of the images; anda diaphragm device configured to change an aperture diameter between the objective lens and the image-forming lens. 2. The biological-specimen observation apparatus according to claim 1, further comprising:a focus detecting unit that detects focusing of the objective lens on the specimen; andan autofocusing unit that moves the stage in a direction along an optical axis of the objective lens on the basis of the detection result of the focus detecting unit so as to focus the objective lens on the specimen. 3. The biological-specimen observation apparatus according to claim 1, further comprising:a zooming mechanism, between the objective lens and the image-forming lens, that changes zoom magnification;wherein the image storage unit stores the zoom magnification in association with the plurality of the images and the positional information. 4. The biological-specimen observation apparatus according to claim 1, further comprising:an operation storage unit having an operation pattern for obtaining a plurality of images with different focal positions, wherein theimage processing unit has a focus projection function. 5. The biological-specimen observation apparatus according to claim 1, wherein the image acquisition unit is a CCD camera, the observation apparatus having a function for changing an image acquisition region of the CCD camera and further comprising an information recording unit that records the obtained image acquisition region. 6. The biological-specimen observation apparatus according to claim 1, wherein the image processing unit has a function for trimming part of the stored images and combining processing them. 7. The biological-specimen observation apparatus according to claim 1, wherein the image processing unit has a deconvolution function. 8. The biological-specimen observation apparatus according to claim 1, wherein the image processing unit generates the one combined image at least by superimposing a bright field image obtained by emitting the illumination light from the first light source and a fluorescence image obtained by emitting the excitation light from the second light source. 9. The biological-specimen observation apparatus according to claim 8, wherein the fluorescence image combined by the image processing unit is subjected to image processing for changing the color in accordance with the brightness value. 10. The biological-specimen observation apparatus according to claim 8, wherein an area of the fluorescent image is a part of an area of the combined image. 11. The biological-specimen observation apparatus according to claim 10, wherein the image acquiring position selection unit moves the stage to a direction intersecting an observation optical axis. 12. The biological-specimen observation apparatus according to claim 1, wherein the position detector unit is a position detector provided on the stage. 13. The biological-specimen observation apparatus according to claim 1, further comprising a heat insulating unit for the specimen. 14. The biological-specimen observation apparatus according to claim 1, wherein the image acquisition unit acquires a bright field image obtained by emitting the illumination light from the first light source at each of the plurality of positions, the image processing unit generates one combined image by combining the plurality of images, the image acquisition unit acquires a fluorescence image obtained by emitting the excitation light from the second light source and being a part of a whole positional information of the combined image while the image processing unit superimposes the one combined image and the fluorescence image on the basis of the positional information stored in association with the plurality of the images. 15. A biological-specimen observation apparatus comprising:a stage for mounting a specimen, wherein the specimen is a small laboratory animal;an objective lens, disposed opposing the stage, that collects observation light from the specimen;a first light source that emits illumination light and irradiates the specimen at an angle with respect to the stage from a side toward the objective lens without passing through the objective lens;a second light source that emits excitation light and irradiates the specimen through the objective lens, along a direction coaxial with the optical axis of the objective lens;an image-forming lens that forms an image from the observation light from the specimen, collected by the objective lens, wherein the observation light comprises a light returning from the specimen as a result of the illumination light and a fluorescence emitted from the specimen as a result of the excitation light;an image acquisition unit that acquires a two dimensional image of the specimen, formed by the image-forming lens;an image acquiring position selection unit that selects a position of the specimen that the image acquisition unit acquires;an image control unit that directs the image acquisition unit to acquire the image at each of the plurality of positions selected by the image acquiring position selection unit;a positional information acquiring unit that obtains a positional information of the each of the plurality of positions of the acquired images;an image storage unit that stores a plurality of the images obtained by the image acquisition unit and the positional information of the images, the plurality of the images and the positional information being mutually associated;an image processing unit that generates one combined image by combining the plurality of the images stored by the image storage unit on the basis of the positional information stored in association with the plurality of the images; anda diaphragm device configured to change an aperture diameter between the objective lens and the image-forming lens. 16. A biological-specimen observation apparatus comprising:a stage on which a specimen is to be mounted, the stage being movable to a plurality of positions, wherein the specimen is a small laboratory animal;an objective lens, disposed opposing the stage, that collects observation light from the specimen;a first light source that emits illumination light and irradiates the specimen at an angle with respect to the stage from a side toward the objective lens without passing through the objective lens;a second light source that emits excitation light and irradiates the specimen through the objective lens, along a direction coaxial with the optical axis of the objective lens;an image-forming lens that forms an image from the observation light from the specimen, collected by the objective lens, wherein the observation light comprises a light returning from the specimen as a result of the illumination light and a fluorescence emitted from the specimen as a result of the excitation light;an image acquisition unit that acquires the image of the specimen, formed by the image-forming lens;a position detection unit that obtains a positional information of the stage;an image control unit that moves the stage to a plurality of positions and causes the image acquisition unit acquire the image at each of the plurality of positions;an image storage unit that stores a plurality of the images obtained by the image acquisition unit and the positional information obtained by the position detection unit, the plurality of the images and the positional information being associated to each other; andan image processing unit that generates one combined image by combining the plurality of the images stored by the image storage unit on the basis of the positional information stored in association with the plurality of the images.