Abstract: A head-mounted image display apparatus which is capable of selectively displaying images of normal and wide sizes efficiently by utilizing approximately all the pixels of a display device without the need of removing an optical system and which provides a bright image at high resolution and is easy to handle. The head-mounted image display apparatus has an image display device (2) for displaying an image, and a projection optical system for projecting the image displayed on the image display device (2) onto an observer's eye. The projection optical system includes an anamorphic optical system which is composed of an anamorphic lens (3) and a cylindrical lens (4), for example. The anamorphic optical system is rotatable about the optical axis. Accordingly, it is possible to selectively observe two images of the normal and wide sizes by rotating the anamorphic optical system about the optical axis through 90.degree. in either direction.

Abstract: An anamorphotic attachment for a projection objective has front and rear lens groups which have vertical diameters greater than their horizontal diameters and received respectively in an inner mounting tube and an outer mounting tube, the latter being connectable to the projection objective at its rear end. The inner mounting tube is fully received in the outer mounting tube and has thereon a shifting screw for moving the inner mounting axially within the outer mounting and a clamping screw actuatable to lock the two mounting tubes together, both accessible at the front end of the inner mounting tube within the outer mounting tube.

Abstract: An illuminating optical system for use in a microfilm reader/printer or the like for illuminating a film comprises an axially symmetric lens system and an anamorphic lens system. The anamorphic lens system includes a condenser lens opposed to a light source. A microfilm reader/printer having such an illuminating optical system causes the axially symmetric lens system to illuminate the microfilm during a reading operation, and the anamorphic lens system to illuminate the film during a printing operation.

Abstract: An illuminating optical system for use in a microfilm reader/printer or the like for illuminating a film comprises an axially symmetric lens system and an anamorphic lens system. The anamorphic lens system includes a condenser lens opposed to a light source. The microfilm reader/printer having such an illuminating optical system causes the axially symmetric lens system to illuminate the microfilm during a reading operation, and the anamorphic lens system to illuminate the film during a printing operation.

Abstract: An anamorphic attachment (3) for purposes of filming and reproduction to be used in conjunction with a basic lens (2). At the attachment (3) there is a first subsystem (8) serving the main purpose of enlargement in a first direction and a second subsystem (7) serving the main purpose of enlargement in a direction vertical to the first direction. The first subsystem (8) contains a positive front lens group (12) and a negative rear lens group (13). The second subsystem (7) a negative front lens group (9) and a positive rear lens group (10). The second subsystem (7) is located between the first subsystem (8) and the basic lens (2), providing that the adjacent negative lens groups (13, 9) of the two subsystems (8, 7) may also be exchanged. If the basic lens (2) is set to a focal length Fg and the attachment to the object distance "infinity" and the total focal length is V1.multidot.Fg in the first direction and the total focal length V2.multidot.

Abstract: For the observation of an elongated object or an elongated zone (12) of an object with a lens (20, 20', 54), in the vicinity of this object or zone (12), a cylindrical lens (23) is used whose axis (Ox) extends along the largest dimension of the object or the zone. In this way, the observation is performed with a large resolution on an extended field.

Abstract: Source of laser radiation for a printer includes at least one laser diode array and an optical system which is telecentric in at least one azimuth for imaging the near field distribution from the laser diode array(s) on a recording medium.

Abstract: There is disclosed an optic system for illuminating a DMD array in a manner for efficient light transfer to an imaging lens. The DMD is positioned between the light source and the lens aperture. An anamorphic optic path is arranged such that the vertical component of the light is compressed to match the physical shape of the DMD array. In this manner the horizontal light component is focused directly on the aperture while the vertical light component is focused optically ahead of the aperture. Together the two light components entirely fill the lens aperture while providing more light intensity at the DMD.

Abstract: An optical scanner has a light source device; a lens for converging a laser beam emitted from the light source device; a deflector having a mirror face which is integrally formed with the shaft of a scanner motor and is constructed by one convex spherical or cylindrical mirror face having a radius R and approximately arranged in the vicinity of a center of rotation of the shaft of the scanner motor; and a scanning face scanned by a light beam deflected by the deflector. The optical scanner satisfies a predetermined relation with respect to the radius R when a distance L.sub.O from a deflecting point to the scanning face at an angle of rotation of the deflector set to zero is equal to a distance L from the deflecting point to the scanning face at the angle of rotation of the deflector set to .theta.. The predetermined relation is provided by the following formula:R={(1/cos.theta.)+cos.theta./(1+cos.theta.)-1}L.sub.oThe light source device uses an element for emitting two or more light beams.

Abstract: A distance measuring device has a light source for emitting a plurality of light beams in a plurality of directions, and a light receiving lens having a plurality of optical axes for receiving the plurality of light beams reflected from objects in said plurality of directions. Light receiving apparatus is provided for receiving the reflected light beams passing through said light receiving lens and providing an output corresponding to distances to the object. The light receiving lens has (1) a central portion with a thickness (D), a focal length f.sub.a, and a refractive index .phi..sub.A, and (2) a second portion adjacent said central portion. Surfaces of said central and second portions closest to said light receiving apparatus comprising one spherical surface having a refractive power .phi..sub.R. the central and second portions being disposed to satisfy the following conditions:0.4<D/f.sub.A <1.5,and-0.05<.phi..sub.R /.phi..sub.A <0.15, .phi..sub.A >0.

Abstract: A viewing apparatus for use in providing either a three-dimensional image when used to view a side-by-side display on a conventional video screen of related left and right images that are each horizontally compressed, or alternatively for use in providing a wide-angle image when used to view a single horizontally compressed image displayed on a conventional video screen. In providing the three-dimensional image, the apparatus transmits the displayed left image to the viewer's left eye and the displayed right image to the viewer's right eye, while horizontally expanding the compressed images and returning them to their original, natural porportions. The displayed side-by-side images both extend along the screen's entire vertical length, such that a three-dimensional effect is provided having the same two-dimensional proportions as the conventional video screen.

Abstract: For the observation of an elongated object or an elongated zone (12) of an object with a lens (20, 20', 54), in the vicinity of this object or zone (12), a cylindrical lens (23) is used whose axis (Ox) extends along the largest dimension of the object or the zone. In this way, the observation is performed with a large resolution on an extended field.

Abstract: An optical scanning device comprising a light source which emits a luminous flux for irradiating a scanning surface and comprises a semiconductor laser element and an anamorphic ellipsoidal Fresnel lens. The device further comprises a rotary polygon mirror having reflection surfaces for deflecting the luminous flux emitted from the light source. The device further comprises an image forming optical system disposed between the polygon mirror and the scanning surface for forming an optical spot image from the luminous flux on the scanning surface. The optical spot is arranged to scan the scanning surface in a horizontal scanning direction and a vertical scanning direction. The optical system is so arranged that the reflection surface and the scanning surface are positioned at conjugate points with respect to each other for the luminous flux with regard to the vertical scanning direction.

Abstract: An optical system for generating lines includes a source of a diverging light beam, a first cylindrical lens (104) which receives the light beam, and a second adjacent cylindrical lens (106) which is at an angle with respect to the first. The beam of light passes through the first and second cylindrical lenses (104, 106) to produce a planar beam of light (124) which becomes a line (122) when incident upon a surface (126). The cylindrical lenses (104, 106) are mounted so as to be rotatable both simultaneously and with respect to each other. The angle of the line generated by the lens configuration is a bisector of the obtuse angles formed by the principal axes of the cylindrical lenses (104, 106) except where the lenses are at right angles to one another. The rotation of both lenses simultaneously changes the angle of the line (128) while rotation of one lens with respect to the other adjusts the focus of the line.

Abstract: A light deflector has a focusing optical system for focusing a light beam deflected by a light deflector onto an object surface. The focusing optical system comprises, in order from the light deflector, a single anamorphic lens, a single spherical lens having a positive refractive index, and a single lens having a toric surface, the lenses having refracting surfaces having respective radii of curvature indicated respectively by r:1, r:2, r:3, r:4, r:5, r:6 in order from the light deflector. The light deflector meets the following condition:-1.0<r:6Y/r:2Y<-0.3where Y is a component of each of the radii of curvature in a direction normal to a main scanning direction in which the light beam is deflected.