Optical: systems and elements – Deflection using a moving element – By moving a reflective element
Patent
1991-01-04
1992-07-28
Gonzalez, Frank
Optical: systems and elements
Deflection using a moving element
By moving a reflective element
359225, 359363, 359369, 359862, G02B 2136
Patent
active
051345153
DESCRIPTION:
BRIEF SUMMARY
The present invention concerns a photo supplement on a microscope, in particular an ophtalmological microscope for the observation of the eye with a slit lamp, comprising means for deviating light from the beam path of the microscope and directing it into a photo camera. Known photo supplements of this kind are provided with so-called beam splitters comprising semireflecting mirrors, one respective portion of the light flux of the imaging ray beam being deflected towards the photo tube with the camera while the remaining fraction reaches the oculars of the microscope. A 100% of the light flux are thus available neither for observation nor for photography, which is disadvantageous.
The present invention is based upon the object of eliminating this drawback and of creating a photo supplement in which all the available light may be used both for observation and for photographic exposures. This object is attained by providing a fully reflecting mirror which is adapted to be moved into the beam path for each photographic exposure. It is thus possible, when the mirror is located outside the beam path of the microscope, to contemplate an object, e.g. an eye, with all the available light, and then to move the mirror into the beam path for a short time and to take a photographic exposure with all the available light. Introducing the mirror into the beam path of the microscope, releasing the camera for the exposure, and returning the mirror to its rest position outside the beam path can be effected so quickly, and these operations can be operated by a single, simple manipulation, that the contemplation of the object is barely disturbed by the exposure.
Known photo supplements of the above-described kind have an adjustable iris diaphragm built into the photo tube which is connected to the beam splitter. Strong vignetting effects result from the unfavorable position of this diaphragm inside the entire imaging beam path, with the practical consequence that when using e.g. a miniature format of 24.times.36 mm, and depending on the selected magnification and diaphragm, more or less important marginal portions are shaded up to complete darkness. It is another object of the present invention to provide a diaphragm arrangement which prevents the drawbacks of known diaphragms. This object is attained by the fact that the diaphragm or diaphragms are placed in front of the mirror with respect to the beam path. In other words, the diaphragm is located between the mirror and the object, more particularly between the mirror and a magnification selector of the microscope.
The invention in particular also concerns a diaphragm arrangement according to the explanations above and according to claims 11 to 13, for use in a binocular microscope more particularly comprising a photo supplement. Among other things, this diaphragm arrangement is advantageous in that it may be operated in a simple manner in conjunction with the mentioned mirror, and moreover, that it may be disposed in the also mentioned favorable position. Besides, it has the advantage of influencing both beam paths of the binocular microscope in the same manner, so that any kind of camera tubes for mono, stereo or instant exposures may be used without necessitating further measures. Finally, the diaphragm arrangement is particularly simple in its construction and operation, as will be explained in more detail.
The invention is now described in more detail by means of an embodiment as illustrated in the drawing.
FIG. 1 shows a slit lamp with the photo supplement of the invention;
FIG. 2 shows a part of the operating device on an enlarged scale and in a partially sectioned view;
FIG. 3 shows a section of a part of the housing with the mirror and the diaphragm in their rest positions;
FIG. 4 shows a somewhat simplified section according to FIG. 3 with the mirror and the diaphragm in their working position;
FIG. 5 shows a partial section of a control linkage;
FIG. 6 shows a section according to line VI--VI in FIG. 3;
FIG. 7 shows a section according to line VII--VII in FIG. 3;
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Papritz Franz
Widmer Hansruedi
Gonzalez Frank
Haag-Streit AG
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