Abstract: A mounting base which includes an object side portion, an eyepiece side portion, and a connecting portion. The connecting portion connects the side portions, and the side portions are parallel. A pair of first mounting holes are formed in the object side portion and a pair of second mounting holes are formed in the eyepiece side portion. An axis line, perpendicular to the object side portion, which goes through a geometric center of gravity of one of the first mounting holes is coaxial with an axis line, perpendicular to the eyepiece side portion, which goes through a geometric center of gravity of one of the second mounting holes. Lens barrels of the objective lenses are fixed to the first mounting holes. Eyepiece units, in which the eyepieces are held, are rotatably engaged with the second mounting holes.

Abstract: An optical illumination assembly comprising an array of optical microprisms and microlenses for redirecting light from a light source. Such displays are used in a wide variety of applications such as backlit flat panel displays requiring a directed light source which provides an efficient output of light. The illumination assembly has a light transmitter optically coupled to an input end of array of microprisms through an optional diffuser, and a microlens on the light output end of each microprism. The microprisms have a light input end optically coupled to the light transmitting means and a light output end spaced from the light input end.

Abstract: A dual field-of-view objective system (40) which is inexpensive, has high transmission and is essentially achromatized and athermalized. The system (40) uses a silicon front lens A and all lens elements have positive temperature/refractive index change coefficient.

Abstract: An optical communication module comprises an optical communication substrate provided with planar divided waveguides which are optically coupled with a light-receiving device for an optical communication, a light-emitting device for the optical communication, and another light-receiving device for monitoring a outputted light-power, wherein the planar divided waveguides have such a configuration that X-shaped branch waveguides are divided by a blind slit at a crossing thereof so that the crossing is removed, and an optical filter inserted into the blind slit. In the aforementioned optical communication module, the light-receiving device for monitoring the outputted light power can be allocated remote from as well as near the light-emitting device for the optical communication, hence a degree of freedom in mounting parts can be heightened.

Abstract: An infrared shielding film comprising a transparent substrate film having, on one face thereof, at least an infrared shielding layer comprising a cured product of a coating layer which comprises (A) an ionizing radiation curing resin and (B) an infrared shielding agent comprising lanthanum in an amount of 0.1 to 20 parts by weight per 100 parts by weight of the ionizing radiation curing resin. The infrared shielding film maintains excellent transmission of visible light, effectively suppresses transmission of the sunlight and exhibits excellent scratch resistance, light resistance, durability and antifouling property.

Abstract: An optical ring network, an optical connector, and a hybrid connector is provided, wherein a leading-out direction of an optical fiber can be changed without bringing about bad influence on the light transmitted with the optical fiber. An optical plug 24 as an optical connector includes a pair of ferrules 31 to be attached to the respective ends of a pair of optical fibers 25 and an optical adapter 32 having accommodating chambers 101 to accommodate the respective end portions of the optical fibers 25 with the respective ferrules 31. And, directing members 26,27 to direct the respective optical fibers 25 led out of the optical adapter 32 are secured to the respective ferrules 31, and the ferrules 31 with the directing members 26,27 are pivotably accommodated in the respective accommodating chambers 101.

Abstract: An optical multiplexer/demultiplexer 1 having a plurality of first waveguides 3, a first slab waveguide 4, an arrayed waveguide grating 5 having a plurality of waveguides, a second slab waveguide 6 and a plurality of second waveguides 7, the individual waveguides being connected in the above order. The ratio of a distance between the plurality of first waveguides 3 at a connecting portion with the first slab waveguide 4 to a distance between the plurality of second waveguides 7 at a connecting portion with the second slab waveguide 6 differs from a ratio of a focal length of the first slab waveguide 4 to a focal length of the second slab waveguide 6.

Abstract: The present invention provides a package for a wavelength division multiplexer (WDM). The package includes a grating comprising an alignment surface; a first sleeve comprising a mount, the mount capable of contacting the grating; and an alignment plate coupled to an outer surface of the first sleeve, where the alignment plate is capable of contacting the alignment surface of the grating. The preferred embodiment of the package also includes a second sleeve with a holding mechanism in contact with the grating. This packaging affords a quick, easy, precise and reproducible positioning and alignment of grating. Thus, the WDM is minimized in size while also reproducibly assembled with perfect alignment in a minimal amount of time.

Abstract: An optical device having a large extinction ratio and being suitable for the digital operation including first and second electrodes (7, 8) formed on both sides of a waveguide structure, respectively such that a carrier-injection region (3a) and a non-carrier injection regions (3b) are formed adjacent to each other in the waveguide structure. When mass carriers are stored in the carrier injection region, its refractive index is reduced lower than the non-carrier-injection regions. In this state, when a light wave with low optical power propagates through the carrier-injection region, since an amount of carriers consumed thereby is small, the refractive index of this region is still lower than the non-carrier-injection regions, and the input light wave is emitted sideways through the non-carrier-injection region.

Abstract: In accordance with the invention, a hermetic optical fiber array comprises a substrate having a planar surface including an array of perforations for receiving optical fibers, a plurality of fibers having cores disposed in the perforations, the fibers bonded to the substrate with a set of fiber ends substantially coplanar with the surface, and a sealing coating disposed on the planar surface and co-planar ends, the sealing coating covering the substrate/fiber joints but having openings to the cores of fibers in the array. The fiber array can be bonded within a hollow tubular fiber array housing, and the fiber array housing, in turn, can be adapted to support a microlens in spaced relation to the coplanar arrayed fiber ends and to hermetically attach to an apertured system housing.

Abstract: An optical communication device for communication between a stator-side circuit and a rotor-side circuit is provided as one aspect of the invention. A pair of optical couplers are interposed between a stator and a rotor, for permitting bi-directional communication between the circuits. One optical coupler has a rotor-side light-receiving element arranged on the rotor with the axis of rotation extending therethrough, and a stator-side light-emitting element arranged on the stator at a location away from the axis of rotation. The other optical coupler has a stator-side light-receiving element arranged on the stator with the axis of rotation extending therethrough, and a rotor-side light-emitting element arranged on the rotor at a location away from the axis of rotation. A slip ring unit for an electronic component-mounting apparatus is provided as another aspect of the invention. The slip ring unit electrically connects between a rotor-side circuit and a stator-side circuit.