摘要:
An optical pickup apparatus comprising: a first, second and third light sources emitting first, second and third light flux having first wavelength of λ1, second wavelength of λ2 and third wavelength of λ3, respectively; and an objective optical system converging the first, second and third light fluxes onto an information recording surface of a first, second and third optical disk, respectively, wherein the objective optical system has a phase structure, and wherein when a first, second and third magnifications of the objective optical system for conducting reproducing information from and/or recording information on the first, second and third optical disks are represented by M1, M2, and M3, respectively, |dM1−M2|, which represents an absolute value of a difference between M1 and M2, satisfies the following relation. |dM1−M2|
摘要:
Methods and apparatus, including computer program products, for identifying a language corresponding to a string of data include receiving a data string and dividing the data string into coded character sequences for each of a plurality of languages. A length of one or more coded character sequences varies among different languages for coded character sequences having a particular number of characters. The coded character sequences are analyzed to calculate, for each of the plurality of languages, a probability that the data string corresponds to language. The calculated probabilities are compared among the languages, and a language is identified as corresponding to the data string based on the comparison.
摘要:
The invention comprises methods for manipulating floating point numbers on a microprocessor where the numbers are sortable. That is, the numbers obey lexicographical ordering. Hence, the numbers may be quickly compared using bit-wise comparison functions such as memcmp( ). Conversion may result in a sortable floating point number in the form of a sign, leading bits of the exponent, and sets of digit triples in the form of declets (sets of 10 bits). In a variable-length version, numbers may be compressed by storing the number of trailing zero declets in lieu of storing the zero declets themselves.
摘要:
An optical element used in a bidirectional optical communication module used for bidirectional optical fiber communication by a wavelength multiplex system, comprising a diffraction grating of binary structure prepared by molding, wherein a taper is formed at a portion of the diffraction grating where light entering the diffraction grating is intercepted by a convex part of the binary structure of the diffraction grating.
摘要:
Methods and apparatus, including computer program products, implementing techniques for testing user interfaces of software application. The techniques include interacting with a user to identify one or more straight lines in a first rendering of a user interface for a software application, the straight lines being diagnostic of the correct layout of the first rendering of the user interface, and using the one or more straight lines as reference lines to determine if a second rendering of the user interface has a correct layout.
摘要:
The present invention relates to a diffractive grating member and to an optical communication module. The optical communication module includes a semiconductor laser;.a coupling optical system for coupling a light flux with a wavelength of λ1 emitted by the semiconductor laser to an optical fiber; and two light-receiving elements for receiving at least two light fluxes each having wavelengths λ2 and λ3 emitted from an end surface of the optical fiber. The coupling optical .system has a diffractive structure, and the coupling optical system changes paths of light fluxes each having wavelengths λ1, λ2 and λ3 into relatively different directions such that the light flux with the wavelength λ1 emitted-by the semiconductor laser enters into the optical fiber and each of the at least two light fluxes each having the wavelengths λ2 and λ3 enters into each of the two light-receiving elements.
摘要:
There is described a strobe device particularly suited for image capturing apparatus equipped with wide-angle lens. The strobe device includes a reflector to reflect a strobe light, a light-emitting tube to emit the strobe light and an optical panel to transmits the strobe light. In the strobe device embodied in the present invention, a maximum luminous intensity of the strobe light, illuminated by the strobe device, is arranged in a direction being different from a direction of a strobe light axis.
摘要:
A zoom lens comprising a negative first lens unit, a positive second lens unit, and a negative third lens unit and having a small backfocus, in which a refracting power of the third lens unit can be intensified to thereby provide a compact zoom lens. An aberration resulting from intensifying the refracting power is corrected by introducing an aspherical surface into the second lens in particular. Furthermore, the first lens unit is divided into two lens components, and the first lens unit is let out while varying a spacing between the two lens components at the time of focussing whereby focussing can be made with less extension amount from an infinite far point to a near distance while preventing degradation of aberrations.
摘要:
A method of producing a lens that includes shifting a first die relative to a second die, and pressing an optical material shaped in a preliminary form between the first die and the second die so as to form a lens having a configuration corresponding to a hollow portion formed by the first die and the second die while shifting the first die relative to the second die. The produced lens includes an effective optical surface configured to converge a light flux. The effective optical surface includes a light entrance side, a light exit side, and an optical axis. The effective optical surface is a convex surface shaped such that when a maximum normal line angle is defined as an angle formed between the optical axis and a normal line at the outermost circumference of the effective optical surface, the maximum normal angle is 60° to 90°.
摘要:
Disclosed is a film mirror used for reflection of sunlight, which includes, in the following order from the side where sunlight is entered, an ultraviolet ray reflection film which reflects ultraviolet ray and transmits visible and infrared light, a plastic film layer, a metal reflection-layer which reflects visible and infrared light, and a protective layer.