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| Number | Title | Issue Date |
| 4861975 | Variable focus optical system and method using electro-optic material Variable focus optical system in which a light beam is projected through a transparent flat cell of electro-optic material coated on both sides with a layer of transparent conductive material. The layer on one side of the cell is divided into a central di... | 08/29/1989 |
| 4833314 | Variable phase stop for use in interferometers An electro-optical device (10) is used to alter characteristics of a light beam passing through it. In a particularly preferred embodiment, the device (10) is used as a phase stop having a dynamically variable aperture whose size is defined by the selecte... | 05/23/1989 |
| 4756611 | Multiple-purpose microscope A multiple-purpose microscope comprising: a stage for placing a specimen; a revolver for carrying a plurality of objective lenses; a differential interference unit mounted adjacent to the revolver so as to be moved into and out of a path of light beam; an... | 07/12/1988 |
| 4744660 | Apparatus for measuring difference in shallow level An apparatus for measuring a difference in level in a sample comprises a light source section which provides illumination light of a variable-wavelength. The illumination light is irradiated onto the sample. A group of filters is provided for shielding di... | 05/17/1988 |
| 4721362 | Phase gradient contrast microscope Apparatus and methods for producing an intensity image from a transparent phase object. A laser beam is generated and expanded. A shutter disposed in the path of the expanded laser beam is opened, and the expanded laser beam is split into first and second... | 01/26/1988 |
| 4636078 | Microscopic detection of membrane surface defects through interference patterns Transparent membranes are examined with a microscope having coaxial brightfield illumination fitted with a narrow bandwidth filter to convert polychromatic light from a source to substantially monochromatic light. Light reflecting off of the surfaces of t... | 01/13/1987 |
| 4584484 | Microscope for producing high resolution images without precision optics A microscope, not employing conventional optical elements, is disclosed wherein a sample under examination is subjected to a moving pattern of illumination having alternate light and dark interference fringes, and having a spatial frequency which varies d... | 04/22/1986 |
| 4573772 | Inverted-design microscope An inverted-design microscope wherein, in order to make an effective micro-operation and microscope observation possible and to make it easy to set and replace system accessories and samples to be observed, holding means capable of holding a plurality of ... | 03/04/1986 |
| 4472023 | High resolution image forming optical system A high resolution image forming optical system provided with an annular aperture stop arranged near the front side focal plane of a condenser lens and an annular filter arranged in a position conjugate with the annular aperture stop with respect to the op... | 09/18/1984 |
| 4407569 | Device for selectively available phase-contrast and relief observation in microscopes The invention contemplates a microscope construction, applicable both to reflected-light and to transmitted-light varieties, whereby an object under examination can be selectively observed for phase-contrast and for relief effect (so-called "contrast modu... | 10/04/1983 |
| 4368947 | Turret condenser for microscopes A turret condenser for microscopes comprising a turret, an aperture stop, a stop ring for opening and stopping down the aperture stop, a cam fixed to the turret, a lever means having one end in contact with the cam and the other end having a through hole ... | 01/18/1983 |
| 4317613 | Illumination arrangement for microscopes The invention relates to an arrangement for simultaneous dark field and phase contrast illumination of microscopic samples in which a bundle of beams from a light source is totally reflected at a shell of an optical cone and directed to the sample via res... | 03/02/1982 |
| 4316653 | Condenser optical system for a microscope A condenser optical system for a microscope comprises, in order from the light ray entrance side, a forward group and a rearward group. The forward group includes a negative lens component and a positive lens component either cemented to or separated from... | 02/23/1982 |
| 4200353 | Modulation contrast microscope with three regions A modulation contrast microscope for rendering phase gradients in phase objects visible by virtue of creating light amplitude differences including a source aperture and a modulator having different density or color regions so that when a transparent obje... | 04/29/1980 |
| 4200354 | Microscopy systems with rectangular illumination particularly adapted for viewing transparent objects A modulation contrast microscope employs a closely wound lamp filament of a rectangular configuration as an illuminating source. The image of the filament is registered on a Fourier plane to which plane a modulator is located which serves to render phase ... | 04/29/1980 |
| 4184737 | Nonlinear optics microscope interferometer An interference microscope based on the principles of nonlinear optics comprises an ordinary microscope which has three additional internal optical elements, namely, two nonlinear frequency-doubling platelets and an infra-red filter, each suitably positio... | 01/22/1980 |
| 4062619 | Variable background intensity apparatus for imaging systems A variable background intensity control system employs a modulator plate having different density or transmittance regions located thereon. The modulator contains an area upon which an aperture slit or image is normally registered. By varying the position... | 12/13/1977 |
| 3972616 | Apparatus for detecting the defects of the mask pattern using spatial filtering Two kinds of light sources, one of which emits a coherent light and the other of which emits incoherent light, are provided. The coherent light and incoherent light respectively emitted from the two different kinds of light sources, proceed on the same op... | 08/03/1976 |
