Abstract Viewer mask changing device for a microscope having at least two photographic cameras each having different size and shape of the frame of the photosensitive material and a viewer receiving a portion of light to be directed to the camera selected for taking a microscopic photograph of an object so as to permit a magnified image of the object to be viewed therethrough while the microscopic photograph is taken. The viewer is provided with a focusing plate located in a plane in which the image of the object is focused and a mask plate rotatably located immediately in front of the focusing plate. The focusing plate has a central rectangular transparent portion the area of which is slightly greater than that corresponding to the size of the frame of the photographic material in any of the cameras and the remaining outer translucent or opaque portion surrounding the central portion, while the mask plate has at least two sets of corner marks each set indicating the corners of the area corresponding to the frame of the photosensitive material in the respective camera. Any of the sets is angularly displaced from the remaining sets about the optical axis of the viewer so that selected one of the sets is positioned in registration with the central portion of the focusing plate by rotating the mask plate while the remaining sets are hidden by the outer portion of the focusing plate, so that the portion of the image to be photographed by the camera selected in connection with the registered set of corner marks is indicated by the registered set of corner marks.
Viewer mask changing device for a microscope having at least two photographic cameras selectively operable for taking a microscopic photograph of the image of an object by the selected camera and a viewer receiving a portion of light to be directed to said selected camera to permit a magnified image of the object to be viewed therethrough while the microscopic photograph is taken by the selected camera, the frame of the photosensitive material in any of said cameras in which the image of the object is photographed being different in size and shape from that in the remaining camera, wherein the improvement comprises a focusing plate provided in said viewer in a plane in which the image of the object to be viewed through said viewer is focused and a mask plate located immediately in front of said focusing plate and being rotatable about the optical axis of said viewer, said focusing plate having a central transparent portion in the rectangular shape while the remaining outer portion is made at least translucent, said central transparent portion being slightly greater in size and shape than the area corresponding to the frame of the photosensitive material in each of said cameras and angularly positioned so that said area is included in said central transparent portion, said mask plate being provided with at least two sets of corner marks located angularly displaced from each other about the optical axis, each of said sets indicating the corners of the area corresponding to the frame of the photosensitive material in the respective camera, thereby permitting one of said sets to be selectively registered angularly with said central transparent portion of said focusing plate so as to be seen through said central transparent portion while the remaining set is substantially hidden by said remaining outer portion of said focusing plate so that the portion of the image of the object to be photographed in the camera selected to be operable in connection with said registered set of corner marks is determined by said set of corner marks seen through said central transparent portion of said focusing plate.
Claim 2
Dependent Claim
351 words
Viewer mask changing device for a microscope having at least two photographic cameras selectively operable for taking a microscopic photograph of the image of an object by the selected camera and a viewer receiving a portion of light to be directed to said selected camera to permit a magnified image of the object to be viewed therethrough while the microscopic photograph is taken by the selected camera, the frame of the photosensitive material in any of said cameras in which the image of the object is photographed being different in size and shape from that in the remaining camera, wherein the improvement comprises a focusing plate provided in said viewer in a plane in which the image of the object to be viewed through said viewer is focused and a mask plate located immediately in front of said focusing plate and being rotatable about the optical axis of said viewer, said focusing plate having a central transparent portion in the rectangular shape while the remaining outer portion is made at least translucent, said central transparent portion being slightly greater in size and shape than the area corresponding to the frame of the photosensitive material in each of said cameras and angularly positioned so that said area is included in said central transparent portion, said mask plate being provided with at least two sets of corner marks located angularly displaced from each other about the optical axis, each of said sets indicating the corners of the area corresponding to the frame of the photosensitive material in the respective camera, thereby permitting one of said sets to be selectively registered angularly with said central transparent portion of said focusing plate so as to be seen through said central transparent portion while the remaining set is substantially hidden by said remaining outer portion of said focusing plate so that the portion of the image of the object to be photographed in the camera selected to be operable in connection with said registered set of corner marks is determined by said set of corner marks seen through said central transparent portion of said focusing plate.
Claim 3
Dependent Claim
25 words
Viewer mask changing device according to claim 1, wherein one of said sets of corner marks is angularly displaced substantially perpendicular to the remaining set.
Claim 4
Dependent Claim
53 words
Viewer mask changing device according to claim 1, wherein three cameras are provided and said mask plate is provided with three sets of corner marks each corresponding to the frame of the photosensitive material in the respective camera, said three sets Being angularly displaced from each other by an angle of about 45*.