optical (Total 599582 Patents Found)

A medium suitable for the optical storage and retrieval of information comprising a substrate, an active layer for retention of the data, and an overlying optical layer, or layers for double-sided. The optical layer serves to produce an evanescent field in or adjacent to the active layer in response to an incident beam...
An apparatus for writing on and reading an overwritable optical disk comprises an identifier detector that identifies a recording condition in the sector to be overwritten, and a delay time controller circuit that sets a variation range of the start point for writing according to the recording condition. The record tim...
An optical system and technique for monitoring a monotonic change in the thickness of a transparent film by means of optical interference, and for eliminating ambiguity in the identification of absolute film thickness. The system is particularly adapted for monitoring the etching of a dielectric film of uncertain initi...
A process for fabricating a waveguide with a desired tapered profile is disclosed. The waveguide has a first section with a first height and a second section with a second height. The first height is greater than the second height. The waveguide height tapers from the first height to the second height. The waveguide is...
The optical elements of a copier are automatically aligned by positioning the elements under the control of signals from an image-dissecting scanner. The scanner, mounted to receive the image normally presented to the photoconductor, examines a master document placed in the position normally occupied by a document to b...
A first pair of optical fibers are held and fixed to a supporting member in a cantilever form, and oppositely connected to a second pair of the optical fibers that are fixed to a square hole of the alignment material. A magnetic body is adhered to each of the first pair of optical fibers. Around the magnetic bodies, th...
A light emitting diode is located beneath a glass scale carrier, one for each scale (azimuth and elevation), emitting essentially monochromatic light, which penetrates through the glass scale; the scale is observed through an optical system. The optical system for viewing of the scale is located on a carrier secured in...
A pair of diffraction gratings are disposed between a fiber and a waveguide carried by a substrate. The gratings each have a common spatial frequency component that couples light between the fiber and the waveguide. Light from the gratings establish first and second components of an electromagnetic field that extend in...
An optical plummet azimuth reference assembly having a rigid, horizontal support containing a centerline inscribed therein and a pair of upstanding elements mounted on the support located at each end of the centerline. Each upstanding element has a vertical reticle co-planar with the centerline and a horizontal reticle...
A method and apparatus for calibrating and performing statistical capability analysis of a pick-and-place machine comprise loading a glass fiducial plate onto a workholder of a pick-and-place machine, loading a glass slide onto a part placement nozzle of the pick-and-place machine, and placing the glass slide onto the ...
An optical voltage measurement circuit for use in an integrated circuit having at least one voltage power rail and method of operation thereof. The optical voltage measurement circuit includes a reference voltage rail that, in an advantageous embodiment, is coupled to an external variable power supply. The optical volt...
A liquid crystal optical element comprises a pair of substrates with electrodes and a liquid crystal and polymer composite material, which is interposed between the pair of substrates, in which liquid crystal is dispersed and held in a polymer matrix so that the refractive index of the polymer matrix substantially coin...
An exercise treadmill machine is provided in which an optical sensor monitors the position of a user on the treadmill and automatically varies the speed of the treadmill to keep the user near a predetermined position on the treadmill's endless belt. The optical sensor preferably includes an infrared (IR) emitter an...
A method of fine intermediate gradation display by an electro-optical device, with little difference in devices is disclosed. In case of driving each picture element of an active matrix electro-optical device, a visual intermediate gradation display can be carried out by using a modified transfer gate complementary fie...
A self-light-emitting indicating apparatus including an enclosure formed by combining a pair of opposing semi-tubular bodies, each having first and second support members positioned at both ends; first and second panels fixed on the first and second support members respectively, at least one of the first and second pan...
A lens-fitted photo film unit includes a shutter for providing photo film with an exposure to create a frame. A flash circuit emits flash light to a subject to be photographed. The flash circuit includes a blocking oscillator for converting low voltage of a battery into high voltage of an alternate current by oscillati...
An improved process for producing a protected optical fiber cable and the cable produced thereby. The process for producing the cable includes the insertion of a relatively thin optical fiber within a relatively large metal tube by means of flowing a fluid around the fiber and through the tube. As the water flows withi...
A rewritable optical medium and a method of managing its defect area is disclosed. The DMA condition or initially assignable spare area size in the present invention is determined based upon the interrelation between the spare area size and the DMA condition. Namely, the PDL entry condition among the DMA condition is d...
An apparatus for analyzing the deleterious characteristics of optically transparent bodies, including distortion, multiple imaging and birefringence. A beam of light is projected along an optical axis onto a beam splitter. The reflected segment passes through the transparent body and is then reflected back along nearly...
An electro-optical device and a method for manufacturing the same are disclosed. The device comprises a pair of substrates and an electro-optical modulating layer (e.g. a liquid crystal layer having sandwiched therebetween, said pair of substrates consisting of a first substrate having provided thereon a plurality of g...
In an integrated optical arrangement, such as a photoelectric position measuring arrangement, a diffraction grid is scanned by light beam diffraction by a scanning unit having a laser. A light beam bundle emanating from the laser is split by the diffraction grid into two diffraction beam bundles, which are inserted int...
An optical beam is made closer to diffraction limited by coupling it into a multi-mode guide, such as an optical fiber, of sufficient length to generate a stimulated Brillouin scattering (SBS) return beam with improved divergence. For this purpose the term ΔkL is made substantially greater than π, where Δk is the di...
A rotary detector has a diffraction grating arranged circumferentially and a center at substantially the center of rotation. The rotary detector measures rotational information of a rotating object. The rotary detector is provided with a light source, an irradiating optical system for irradiating luminous flux from the...
A fiber optic cable having stress indicating means and a method for making same. The stress indicating means provides a cost effective method for determining whether an optical cable has been bent, stressed or otherwise mishandled, which may cause optical loss when the cable is placed in service. Broadly stated, the fi...
The invention features a treatment method of deeply seated tissue and a corresponding medical instrument. The medical instrument includes a light guide adapted to transmit light energy of a selected wavelength from a light source to a selected volume of tissue, a conduit constructed to deliver a flow of coolant from a ...
A single beam direct read during write and write protect system for use in an optical data storage system. The optical data storage system includes a reflective-type optical disk, a laser for producing a beam of radiation to write data onto the optical disk during write operations, and a radiation detector for producin...
An optical delay time adjuster and an optical time-division multiplexer. The delay time adjuster includes a support, an optical fiber attached to the support, and a device attached to the support which adjustably changes the length of the optical fiber. In various embodiments the device is an electric heater or cooling...
A method for controlling the position of an optical beam incident on a track of a rotationally mobile carrier of information, such as a disc, includes picking up a beam reflected by the disc using an optical pick-up and determining a positioning error of the beam with respect to the track. The pick-up may include sever...
Optical fibres are drawn from a solid preform which consists substantially of SiO 2 and doped SiO 2 . After leaving the heating zone, the fiber is guided through a space having a laminar gas flow to restrict the temperature drop across the fiber so that no extra stresses are incorporated in the fiber upon cooling. A d...
An apparatus for counting a number of record tracks which an optical head traverses on a basis of a periodical track transverse information INF TR representing the traverse of the head across the record tracks. The periodical track transverse information INF TR is derived by sampling information on the record tracks ...
An optical apparatus for controlling an angle of divergence of a ring beam which is capable of irradiating a ringed light beam having a uniform distribution of light intensity with an arbitrary angle of divergence with respect to the optical axis in the direction of 360° concurrently. The optical apparatus comprises p...