摘要:
An image fiber is provided with an image transmitting portion including a plurality of cores and a cladding surrounding the cores; a jacket layer higher in refractive index than the cladding, covering the periphery of the image transmitting portion; and a coating layer higher in refractive index than the cladding, covering the periphery of the jacket layer. The image fiber, integrally constructed in this way, allows light propagating through the cladding to be effectively eliminated, and thus fails to produce flare.
摘要:
An optical low pass filter consisting of a diffractive optical element consisting of a plurality of regions which have different imaging characteristics and are joined adjacent to one another so that the imaging characteristics are varied discontinuously. This optical low pass filter is to be used for optical instruments using solid-state image pickup devices and so on.
摘要:
An image fiber includes plural kinds of cores and a common cladding containing the cores, which are arrayed so that no similar cores are adjacent one another. A method of making the image fiber is that a plurality of optical fiber elements having cores of different diameters are arranged so that no similar cores are adjacent one another, and after being inserted in a jacket pipe, are heated at a high temperature to fuse the cladding portions of the optical fiber elements so that the whole is drawn down to a desired thickness.
摘要:
An endoscope system including a first hard endoscope which uses a relay lens as an image transmission optical system, a second hard endoscope which uses an image guide formed by a fiber bundle, and a TV camera which is mountable respectively on the first and second hard endoscopes and which is rotatable. The TV camera has built therein a CCD. An optical low-pass filter for removing moire even in case of being rotated is provided on an ocular part of the second hard endoscope.
摘要:
An image fiber has a plurality of optical fibers with normalized frequencies different from one another, which is constructed so that a plurality of cores different in size and shape from one another are distributed at random in a cladding. The optical fibers include at least two kinds of optical fibers having propagation modes different in number. Thus, the image fiber is capable of suppressing cross talk to prevent the degradation of image quality.
摘要:
A TV system for endoscopes is configured to connect to a fiber scope using an image guide fiber bundle and a rigid endoscope using a relay lens system. An image is formed by either the fiber scope or the rigid endoscope on a TV monitor. The camera control unit controls a level of the color difference signal in accordance with spatial frequency components contained in the TV signal. A variable switching unit is provided which allows the electrical circuits of the camera control unit to function selectively in accordance with the characteristics of the image transmission system.
摘要:
A light scanning optical device comprises a light source for entirely illuminating a subject, a converging optical system for converging light returning from a specific minute region of the subject, a light detector for detecting the light converged by the converging optical system, and a scanning mirror for scanning the minute region, the scanning mirror being produced by a semiconductor manufacturing process.
摘要:
An illumination optical system has a diffusion member including a number of nearly spherical members which are diminutive in size and transparent and a transparent medium whose refractive index is higher than that of air and different from that of the nearly spherical members and which holds the nearly spherical members, on the exit end face of a light conducting device for introducing illumination light. In this way, a visual field can be efficiently illuminated.
摘要:
An imaging optical system includes a liquid crystal lens including a first body formed of a substantially transparent birefringent liquid crystal member, a second body formed of a substantially transparent birefringent liquid crystal member, and two pairs of electrodes for adding an electric field or a magnetic field onto the first body and the second body. A rear face of the first body is aligned perpendicular to a front face of the second body, the first body and the second body have substantially symmetrical shape against a plane perpendicular to an optical axis and a plurality of optical elements are arranged front and after the liquid crystal lens. The liquid crystal lens has two distinct focal points. The system automatically switches between these focal points, based on the position of the lens with respect to the object being observed.
摘要:
An imaging optical system is disclosed. The system comprises a liquid crystal lens including a first body consisting of a substantially transparent birefringent liquid crystal member, a second body consisting of a substantially transparent birefringent liquid crystal member, and two pairs of electrodes for adding an electric field or a magnetic field onto the first body and the second body. A rear face of the first body is aligned perpendicular to a front face of the second body, the first body and the second body have substantially symmetrical shape against a plane perpendicular to an optical axis and plurality of optical elements are arranged front and after the liquid crystal lens.