摘要:
The invention is directed to an optical system with reduced chromatic aberration, particularly for use in microscopes for imaging the light source in the aperture diaphragm of a condenser. According to the invention, an adapter assembly is associated with a collector assembly. The adapter assembly has an apochromaticizing action and substantially reduces the chromatic aberration of the collector assembly and accordingly achieves the high aperture required on the lamp side for achieving high efficiency.
摘要:
In articulated optical systems, rotation of the image takes place due to the articulations. The invention eliminates this disadvantage by producing a signal whose polarity is dependent on the direction of rotation in which the image produced in the observation plane (64) is turned with respect to the object. By the signal, a compensation element (72) arranged in the articulated optical system is turned until the signal has disappeared. Two devices are disclosed for producing the signal: 1. At the start of the articulated optical system a mark (16) is introduced by reflection, it being focused at the end of the articulated optical system on a sensor (67). 2. On all articulations there are arranged position transmitters (111,112, etc.) which are connected with a minicomputer (130) which calculates the resultant image rotation and gives off a corresponding signal via a digital analog converter (131).
摘要:
An optical system for microscopes to enable microscopes having objectives of infinite exit vertex focal length to be made compatible with microscopes having objectives of finite exit vertex focal length, and vice versa, thus enablying the microscope user having a microscope of one kind to continue to use his supply of interchangeable objectives if he acquires a microscope of the other kind, and enabling microscope manufacturers to stock only one style of objective even if both styles of microscopes are being manufactured or if a transition is being made from one style to the other. The invention provides adapters having optical elements which enable an objective of the finite exit vertex focal length kind to be used with a microscope designed for an objective of the infinite exit vertex focal length kind, or vice versa, the optical system of the adapter providing adequate compensation or correction for aberrations.
摘要:
An ophthalmological instrument having optical elements providing an examination light beam path and an illumination light beam path. The optical elements include an objective for producing an inverted magnified flattened image of the fundus of the eye, and further elements for focusing this image at infinity and projecting it selectively either into an observation tube or into a camera or other documentation device where a record of the image may be made. The illumination beam path includes a source of light and means of projecting this light, via a perforated mirror, into the pupil of the patient.
摘要:
The invention relates to a tubular lens unit that obtains a chromatically compensating effect when used with objectives having an infinite image distance and chromatic residual errors. The inventive tubular lens unit fulfils the following conditions: equation (1) CHL=CHLo−A&Tgr;2 mT ϕT=0, and equation (2) CHV=CHVo−1000&1gr; mT ϕT d1=0, wherein CHL represents the chromatic longitudinal deviation of the tubular lens unit, CHLo represents the chromatic longitudinal deviation of the objective, CHV represents the chromatic magnification difference of the tubular lens unit, CHVo represents the chromatic magnification difference of the objective, &1gr; represents the wavelength, mT represents the dispersion index of the tubular lens unit from m&Tgr;=me=1/&1gr;v wherein e is the main colour index, and &1gr; the Abbe number, A represents the field point, d1 represents the distance between the first optical element of the tubular lens unit and the entrance pupil, ϕ&Tgr; represents the refractive power, and ϕT represents the index of the respective lens in the tubular lens unit.
摘要:
An UV-capable dry objective for microscopes in which aperture aberration is corrected, at the same time, both for the visible spectrum and for a selected UV-wavelength. The objective comprises two lens groups separated by an air gap which is varied in size by relative movement between the two lens groups. The size of the air gap is adjusted to correct aperture aberration for the selected UV-wavelength. The objective is designed so that the mathematical sign is the same for both (i) the corrections required as the illumination moves toward the longer-wave portion of the visible spectrum, and (ii) for the corrections required as the illumination moves toward the shorter-wave portion of the UV-spectrum. The objective has an aperture of at least 0.7 and a magnification of more than 60.times..
摘要:
In an instrument for the examination and surgery of the eye, an ophthalmological objective is combined with an operation microscope whose main objective is combined with an optical system of variable back focus and focal length. Every plane of the eye lying between the cornea and the fundus is imaged by the instrument at an intermediate image plane. In this way, with a single instrument, the operator can carry out work on the cornea, the eye lens, the vitreous body, and the retina. Since the instrument provides the observer with a reflection-free image, contact of the eye to be operated upon with an optical auxiliary means which eliminates the refractive power is unnecessary.
摘要:
The invention contemplates an improved ophthalmological instrument wherein photo slit-lamp function (for anterior-chamber examination of an eye) are combined with fundus-camera functions (for posterior-chamber examination of the eye), with important advantages of manipulating convenience and reduced cost. The invention is disclosed (a) for the case of a photo slit-lamp accessory for use with an existing fundus camera and (b) for the case of a more compact new instrument to serve both functions.
摘要:
A hand-held ophthalmoscope having a handle part and a head part, with an illuminating device in the handle part. In the head part is an imaging lens system for producing an image of the fundus of the eye being examined, and an axially displaceable optical system for focussing the image of the fundus at infinity. The illuminating device in the handle has a source of light and a condenser and a field diaphragm. There is an optical system for imaging the field diaphragm in the key of the patient. A test mark is pivotally mounted on the mount of the axially displaceable optical system in the head portion of the device, and may be moved into cooperative relation to a scale. Preferably the optical system for producing the image of the fundus, and the partial optical system for imaging the field diaphragm or the test mark, have the same focal length. Preferably also there is an image erecting prism between the optical system which serves to produce the image of the fundus and the optical system which serves to focus the image of the fundus at infinity.
摘要:
An optical system in which at least one of the elements is made from so-called gradient glass having a radial difference in refractive index. The element having this radial difference may be either a lens with at least one curved surface, or a plane-parallel plate. The radial variation in refractive index varies in accordance with a formula which is given.