Abstract: A crank member 34 is supported to a joint shaft .beta..sub.1, and a horizontal fulcrum .beta..sub.6 on the crank member 34 and a portion .beta..sub.8 of a stand 18 are connected together by a vertical sublink 37, whereas a vertical fulcrum .beta..sub.7 on the crank member 34 and a portion .beta..sub.9 of a front link 27 are connected together by a horizontal sublink 38. Accordingly, the front link 27 supporting a medical optical equipment 33 is always kept in a substantially vertical condition. As a result, there is no danger that the front link 27 may largely swing to strike against any persons in the periphery thereof, thus providing a stand apparatus desirable from the viewpoints of operability and sanitariness.

Abstract: A light source apparatus for an endoscope having a light source for emitting a bundle of illuminating light rays which are to be supplied to a light guide of the endoscope. The apparatus includes at least a pair of light-blocking plates disposed in the bundle of illuminating light rays to face each other across the optical axis of the ray bundle, and a device for supporting the light-blocking plates such that the plates are rotatable about an axis extending therebetween at right angles to the optical axis. At least one of the light-blocking plates has such a cross-sectional configuration as viewed in the optical axis direction that the light-blocking plate is bent at an angle to the axis of rotation near the center of the illuminating optical path.

Abstract: The rotational shaft 22 is provided with a pair of permanent magnets 31a and 31b, at its opposite ends. The bearing device 30 for the light scanning apparatus includes: a pair of electromagnets 32a and 32b; and a pair of voltage control circuits 33a and 33b. The electromagnet 32a is constructed from an iron core 321a provided with a coil 322a. Similarly, the electromagnet 32b is constructed from an iron core 321b provided with a coil 322b. When the rotational number increases to exceed a predetermined rotational number, the control signal generating circuit 53 switches the electric voltage applied through each of the coils 322a and 322b so as to switch the bearing stiffness of the bearing device. As a result, the resonant frequencies of the conical and cylindrical modes become much lower than the present actual rotational number .omega.0 of the rotational shaft. Accordingly, it is possible to prevent the rotational shaft from exhibiting any of the conical and cylindrical mode resonant actions.

Abstract: A polygon mirror includes a polygon base having a plurality of attaching surfaces, a plurality of base plates each of which is fixed to each of the attaching surfaces of the base and has a reflecting surface for reflecting a laser beam, a plurality of total reflection mirrors each of which is fixed onto each of the base plates, and a reflecting direction adjusting mechanism. The reflecting direction adjusting mechanism connects the base to the base plate for the adjustment of a direction along which the laser beam is reflected by the reflecting surface of the total reflection mirror with respect to the attaching surface of the base.

Abstract: The present invention provides a read-write head for an optical tape recorder comprised of a synchronized scanning transmissive polygon and rotating lens wheel. The transmissive polygon is a multi-sided piece of transparent optical quality material for displacing a through transmitted collimated read or write light beam. The lens wheel comprises a unitary disk-shaped piece of optical quality material having a plurality of individual lenses precision molded or diamond point turned therein for focusing the through transmitted and displaced read or write light beam onto a recording media. The polygon is rotated to translate the displaced beam for scanning along a linear path aligned with an arcuate path followed each successive lens on the rotating lens wheel. The rotation of the polygon and lens wheel are synchronized such that each scan of the displaced beam along the linear path coincides with the movement of a lens along the arcuate path to trace out a data track on the recording media.

Abstract: A night vision goggle device is fabricated for consumer use. The device employs interpupillary and diopter adjustments for each eye of the user. The combined adjustment mechanism incorporates manually operable control knobs located on the housing and one knob for each of the eye pieces. Each control knob is capable of moving both in a forward and rear mode and in a transverse mode. The knob can provide diopter focus adjustment for a front to back motion and for lateral movement or transverse movement the control provides for interpupillary adjustment. The movement of the knob and the removal of pressure or force from the knob enables the optical assemblies to be locked in position by a friction fit.

Abstract: A polarizing screen 20 for presenting images in response to receipt of imagewise rays of light 22 projected from, for example, a video projector. The polarizing screen 20 is made of a woven polarizing fabric 1 which has front and rear surfaces D and E opposite to each other and which is woven in a satin fashion including warps of one of polarizing and non-polarizing threads 12 and 11 and wefts of the other of the polarizing and non-polarizing threads 12 and 11. The front surface D of the woven polarizing fabric 1 has a relatively large portion of the polarizing threads 12 being exposed therefrom and the rear surface E thereof has a relatively large portion of the non-polarizing threads 11 exposed therefrom. The polarizing threads 12 of the woven polarizing fabric 1 have their lengthwise direction oriented substantially perpendicular to a horizontal plane and, therefore, the horizontal viewing angle is increased.

Abstract: In an optical scanning apparatus, a light beam from a light source is deflected by a deflector and the deflected light beam is converged on a scanning surface by an optical system. The light beam from the optical system is reflected by a reflecting element such that the reflected light beam has an angle with respect to a main scanning surface. The reflected beam is detected. When a distance from a deflection point of the deflector to the scanning surface along a direction of an optical axis of the optical system is L, a distance from the deflection point to a lens surface of the optical system at a position closest to the scanning surface is A, and a maximum distance from the deflection point to the reflecting element is B, the condition 0<(B-A)/L<0.2 is satisfied.

Abstract: A deformable mirror system comprises a reflective face sheet, substrate, positioned behind the face sheet, having actuator bore holes extending entirely through the substrate. Actuator assemblies for deforming the face sheet are positioned in a different ones of the actuator bore holes and are bonded to both a back surface of the face sheet and to the substrate. The actuator assemblies each comprise a tile bonded to a back surface of the substrate to close a distal end of the actuator bore hole and an actuator bonded to the tiles, extending through the bore hole, and bonded to the face sheet near a proximal end of the bore hole. These assemblies can then be individually removed by destroying the adhesive quality of these bonds.

Abstract: A method and a device for diametric active scanning of a forward region using a collimated beam of radiation energy to detect and track target objects by collecting beam energy scattered by the objects. Each scan line of the beam proceeds from an edge of a circular field-of-view through the center to the opposite edge. The azimuthal scan angle is advanced by a constant increment for each successive scan, and scanning progresses uniformly and continuously. A device implementing the method includes a rotor assembly having first and second angled reflectors which rotates within a concentric ring which includes an array of curved reflecting facets. A collimated beam emitted by a radiation source is reflected by the first reflector onto contiguous segments of each successive facet instantaneously aligned with the reflected beam path, the beam being obliquely re-reflected and redirected to the second angled reflector which reflects and redirects the beam so as to scan a rotating pattern of diametric scan traces.

Abstract: An optical rotation device with infinite depth of field for transmitting optical images along an optical axis and selectively rotating the image about the optical axis, while preserving all of the three dimensional characteristics of the image. The optical rotation device consists of two optical elements optically coupled in series, each of which produces an inversion of the image about an axis orthogonal to the optical axis. Rotation of the image by any angle in the plane normal to the optical axis is achieved by rotating the two optical elements relative to one another about the optical axis.

Abstract: A binary diffractive optical element provides uniform intensity for the scanning beam of a raster output scanning (ROS) optical system by diffracting the excess intensity of the beam.

Abstract: An apparatus is provided for detecting a light focus position of a scanning laser beam on a surface to be scanned. A laser beam splitting member splits part of the scanning laser beam, when the beam is scanning an unnecessary scanning area. A plurality of beamlets thus irradiate on a non-scanning direction line. A determination is made of an optical path differences between the split laser beamlets. Further, the spot size of each of the split beamlets is measured, thereby determining a split beamlet irradiating the surface to be scanned based on the spot size of each of the split beamlets.