摘要:
A flexible shaft driven to rotate is inserted through a transparent sheath having pliability. By a fiber inserted through the inside thereof, low-coherence light is guided and is made to exit to a living-body tissue side which is an observation target through a lens and a prism forming an exit and entrance portion at the tip portion. Subsequently, the light reflected on the living-body tissue side is guided in order to produce an image. In that case, a positioning member for keeping the exit and entrance portion and the living-body tissue at a proper distance is formed at the tip portion of the sheath or the tip portion of an endoscope through which an optical probe is inserted and, therefore, a stable tomogram image can be produced.
摘要:
An apparatus and method for focus error detection operable to receive light reflected from an inspected object and to determine a focus error on a surface of the inspected object, the focus error detection apparatus including optics and at least one detection apparatus, whereas the optics and the at least one detection apparatus define at least a first focus error detection path and a second focus error detection path, the first focus error detection path detects focus errors with a greater sensitivity than the second focus error detection path, while the second focus error detection path detects focus errors over a greater focus error range than the first focus error detection path.
摘要:
Disclosed is an atomic force microscope. A Fabry-Perot interferometer where the intensity of light reflected at a cantilever through an optical fiber varies sensitively to a displacement of the cantilever is constructed to accurately measure a distance between the optical fiber and the cantilever. A Fabry-Perot resonator is formed by the optical fiber having an end of a concave mirror shape and a reflective surface of the cantilever. A displacement of a cantilever tip is measured by detecting a signal reflected at the resonator and a feedback signal corresponding to a variation in the displacement of the cantilever tip is generated. The displacement of the cantilever tip is kept constant by actuating a piezoelectric element in a Z-axis direction.
摘要:
A focus retaining mechanism of a camera is disclosed. The camera includes a base, a focusing lens, a retaining member, and a retaining hook. The base has a cylindrical and vertical opening in it. The focusing lens is rotationally fixed within the opening. The retaining member is horizontally and movably fixed in the base. The horizontal sides of the retaining member include a ratchet side, a smooth side, a first end and a second end positioned over the connecting portions of the ratchet side and the smooth side. The retaining hook has a horizontal arm and a vertical arm installed under the horizontal arm. The horizontal arm can move horizontally across the upper side of the retaining member, and the vertical arm can thus contact each of the horizontal sides of the retaining member.
摘要:
A system, method and apparatus for storing data using an optical medium. The medium is initialized and data is inserted into the medium, read from the medium and reinserted into the medium. Queues, random access storage devices and other similar structures are formed according to this technique.
摘要:
An optical information storage device including a first photodetector for detecting a regenerative signal from reflected light from an optical recording medium, a second photodetector for detecting a tracking error signal and a focusing error signal from the reflected light, and a beam splitter for separating the reflected light into a first beam directed toward the first photodetector and a second beam directed toward the second photodetector. The optical information storage device further includes a phase compensating mechanism provided between the beam splitter and the first photodetector for compensating for a phase difference of the first beam, a Wollaston prism provided between the phase compensating mechanism and the first photodetector for separating the first beam into two beams having orthogonal polarization planes, and a polarization plane rotating mechanism for rotating the polarization plane of the first beam incident on the Wollaston prism.
摘要:
A near-field optical head which reproduces, with high S/N, information recorded with extreme density and is compact in structure. On an electrode (2) is formed a recording medium (3) that emits a light by applying an electric field. Brought into proximity to a recording medium (3) is a near-field optical head (101) having a slider (31) formed with an inverted cone formed hole such that an apex thereof is rendered as a microscopic aperture (6). A microscopic electrode (5) is formed on a side surface (32) of the inverted cone formed hole. An electric field (9) is applied only to a microscopic region to cause light emission. It is possible at the aperture (6) to detect a light emitted only by the microscopic region.
摘要:
A sample analyzing apparatus includes a micro-aperture probe, which is provided with a light passage aperture having a diameter shorter than wavelengths of light, the light passage aperture being formed at a radiating end of the micro-aperture probe, and a light source, which produces light for sample analysis. An incidence optical system causes the light for sample analysis to enter into the micro-aperture probe from an entry end of the micro-aperture probe. A sample supporting member supports a sample at a position that is exposed to near field light radiated out of the radiating end of the micro-aperture probe. An image sensor receives light scattered by the sample and detects an intensity distribution pattern of the scattered light. A display device displays the detected intensity distribution pattern.
摘要:
A method for operating a preferably confocal laser scanning microscope, the laser system (1) comprising at least one solid-state laser or a diode laser, is characterized in that, in order to avoid undesired distortions of the image information, the scanning procedure or the recording of data is synchronized with the phase of an at least largely continuous emission of intensity from the laser system (1). The laser system (1) and the data recording system (3) are synchronized by a control unit (2).
摘要:
A confocal optical system is disclosed that utilizes fiber optic components in its construction. The system includes a light source, two detection units, an aperture and an optical element all optically coupled to a fiber optic coupler via optical fibers. In addition, a novel automatic focusing device is disclosed which utilizes chromatic aberration to maintain a target object in optimal focus. The device includes two light sources having different wavelengths of light, an optical element, an aperture, two detection units and a beam splitter. One light source is used to achieve initial focus and to illuminate the target object. The second light source is used to maintain the target object in optical focus. Light reflected off the target object is measured by one of the detection units. The magnitude of the light of the second wavelength measured by the detection unit is utilized to maintain focus. A second detection units is utilized to measure the intensities of the two light sources to yield normalized results. Further, a method of diagnosing an optical system is also disclosed. The method includes comparing a current set of readings of light against a set of reference readings taken at an earlier point in time. If the difference exceeds a predetermined threshold, a problem is indicated.