Hoya Corporation

Other

Hoyo Corporation

Yoshiatsu Yokoo

Teruo Yamashita

Masahiro Yoshida

Kaoru Kagami

Hidekuni Asai

Ken Uno

Lihong Zhang

Seiichi Yokoyama

Reikou Fukazaki

Toshihisa Kurosawa

Shigeru Hayashi

Shinichiro Hirota

Tetsuo Takano

Kiyoshi Morita

You Ohgami

Hiroyuki Kosuga

An optical switch easy to adjust optical parts without using a catoptric system and an optical add/drop multiplexer using the optical switch are provided. Between an input light outputting collimator deviceand an output light inputting collimator deviceprovided to face each other at a predetermined spaced interval, a drop light inputting collimator deviceand an add light outputting collimator devicefixed and held on a movable holding memberin common are moved forward and retreated, and thereby a switching is conducted.

Optical switch and optical add/drop multiplexer using the same

A collimatorfor an input light, a collimatorfor an output light, a collimatorfor a branched light, a collimatorfor an inserted light and a wavelength selecting filterare provided on a common substrate, and mirrorstofor correcting an optical path or prisms XXXX to XXXX capable of producing the same advantages are provided on the optical paths between the collimatorstoand the wavelength selecting filterrespectively. By adjusting the mirrors or prisms, the shift of the optical axis between the collimators is corrected.

Optical module formed on common substrate for branching an optical signal

As a wavelength selection filter, a filter in which dielectric multilayered films are formed on a substrate, an optical fiber grating in which diffraction grating is formed in an optical fiber, and so on, can be used. As another optical demultiplexer, as described in Japanese Patent No. 2599876, an arrayed optical waveguide diffraction grating which forms plural optical waveguides having different length of optical paths on the substrate to demultiplex the multiple wavelength light to the respective wavelengths can be used.

There are disclosed an optical filtering module and various optical devices using the filtering module. The optical filtering module has an optical filter for transmitting, attenuating or reflecting light having a certain wavelength range, a first optical system having an optical fiber for guiding light to be transferred to the optical filter, a second optical system having an optical fiber for guiding light transferred from the optical filter, the second optical system being opposingly arranged to the first optical system while interposing the optical filter therebetween and an outer cylindrically shaped glass holder for holding therein the optical filter, the first optical system and the second optical system secured thereto.

Optical filtering module and optical devices using such optical filtering module

A groove portion to stay the adhesive agent penetrated into either one of closely contacted surfaces of the rod lens and the optical filter is formed, thereby, the penetration of the adhesive agent into the optical path is prevented.

Optical filter module and optical apparatus using the same

The lateral V-shaped groove ( ) and the longitudinal V-shaped groove ( ), which cross each other, are formed on a surface of the substrate ( ). When the optical element ( ) is contacted with and supported by four ridges composed of sides ( ) of one V-shaped groove and sides ( ) of the other V-shaped groove, the optical element is positioned at the three-dimensional support position which is geometrically determined by the four points at which the four ridges and the surface of the optical element come into contact with each other.

Positioning method of optical element, positioning member of optical element and optical unit, and manufacturing method thereof

A manufacturing method for a glass product not having a rotatively symmetric body like an optical fiber fixing member but having a fine structure as of optical fiber engagement portions, to transfer the fine structure with a high precision without creating molding burrs, includes the steps of placing a glass material in a cavity defined by a lower mold, an upper mold, and a side mold, molding the glass material in the cavity with pressure into the glass product in so controlling that the glass material has a viscosity range of 10 to 10 poises at the beginning of molding operation with pressure, that the lower mold is at a temperature in a range such that the glass material indicates the above viscosity range, and that the upper and side molds are at a temperature in a range such that a converted viscosity of the glass material at the temperature of the upper and side molds is 5 to 100 times higher than the viscosity of the glass material at the temperature of the lower mold, and decreasing the temperature of the lower mold at the same time that or after the glass product begins to be molded with pressure. To produce an optical fiber fixing member, the lower mold has a mold face for molding optical fiber engagement portions of the optical fiber fixing member; the upper mold has a mold face for molding a bottom of the optical fiber fixing member; and the side mold has a mold face for molding a side face of the optical fiber fixing member

Method for manufacturing glass product

An optical fiber fixing member having optical fiber engagement grooves,and peaks,between the engagement grooves,is configured as a unitary structure by molding. A preform G is pressed with a mold,such that the concavities,of the mold,, which comprises convexities,and concavities,for the transfer of the engagement grooves,and the peaks,, respectively, are filled with the preform G only partially. The shape of the convexities,of the mold,is transferred, yielding optical fiber engagement grooves,whose surfaces are mold transfer surfaces,. Because the preform G fills the concavities,only partially, the peaks,between the optical fiber engagement grooves formed by the filling of the concavities,are free rounded surfaces,whose shape does not reflect the shape of the concave bottom portions,of the mold

Optical fiber fixing member, method of manufacturing the optical fiber fixing member, optical fiber array, and method of manufacturing the optical fiber array

The optical fiber fixing member made of glass, especially optical fiber guide block, is conventionally produced by a mechanical processing. However, the mechanical processing has problems that a production cost becomes high and mass-production is difficult. The problems above can be solved by the present invention providing a method for producing an optical fiber fixing member comprising: disposing a glass shaping preform whose plane view resembles to the plane view of the molded article and whose faces to be positioned in the pressurizing direction during press-molding assumes planes or outwardly convex curved surfaces, in a mold having a cavity of a given shape; and heating the glass shaping preform up to a temperature at which the glass shaping preform can be mold-shaping and thereby press-molding it into a molded article having at least one edge formed of a free surface.

Optical fiber fixing member and method for manufacturing the same

A preform used for producing an optical fiber fixing member having an optical fiber fixing part and a lower-staged part by a mold shaping method, is formed so as to be composed of a large-thickness portion having an upper surface or a peak portion to which that transfer-shaping surface of transfer-shaping surfaces of a shaping mold which is to shape the said optical fiber fitting portion(s) comes into contact at an initial stage of mold shaping, and a small-thickness portion having an upper surface or a peak portion to which that transfer-shaping surface of transfer-shaping surfaces of the shaping mold which is to shape the upper surface of the lower-staged part comes into contact at an initial stage of the mold shaping, the preform being formed in a configuration in which the said small-thickness portion is adjacent to the large-thickness portion, the form of the preform viewed as a plan view parallels with the form of the said optical fiber fixing member viewed as a plan view and the form of the preform viewed as a side view parallels with the form of the said optical fiber fixing member viewed as a side view, whereby the above optical fiber fixing member can be easily produced by a mold shaping method.

Preform and process for the production thereof

(1) Alignment mark transfer portion(s) is/are formed on the transfer molding surface of a mold that is used for press-molding a optical element fixing member and having alignment marks; (2) alignment mark(s) is/are formed on the mold material by dry-etching, and the mold material is worked using the alignment mark(s) as a reference to form the transfer molding surface constituted by a plurality of transfer patterns, in order to obtain a mold for press-molding; and (3) the transfer patterns are formed by dry-etching, or a transfer molding bare surface for transfer patterns is formed by dry-etching and a mold release film is formed thereon to reflect the shape of the transfer molding base surface, in order to obtain a mold for press-molding.

Mold and method of producing the same

In a method for molding glass products having a fine structure as of an optical fiber holder with a high size precision, a mold used for the molding has the fine structure in a size such that a size difference occurring when the glass product is cooled down to a room temperature where at the end of molding with a pressure a size of the fine structure of the mold for glass product and a size of a fine structure of the glass product formed by transfer of the fine structure of the mold are the same as one another is so adjusted that a size of the fine structure of the completed glass product falls within a permissive size precision range. The mold may has a size satisfying, as a size of a fine structure at a room temperature, a formula [1+(.alpha.g-.alpha.m).times..DELTA.T+.alpha.g'.times..DELTA.T'].times.Sg, wherein Sg denotes a size of a fine structure of thc glass product at the room temperature; .alpha.g denotes a mean thermal expansion coefficient of the glass to be molded in a temperature range from the room temperature to the glass transition temperature of the glass to be molded; .alpha.m denotes a mean thermal expansion coefficient of the mold in a temperature range from the room temperature to the glass transition temperature of thc glass to be molded; .DELTA.T denotes a difference between the room temperature and the glass transition temperature of the glass to be molded; .DELTA.T' denotes a difference between a temperature at which the mold's pressure exerted to the glass product is released and the glass transition temperature, in a case where the mold's pressure exerted to the glass product is released at a temperature higher than the glass transition temperature after pressing the mold with a high pressure; and .alpha.g' is a thermal expansion coefficient of the glass to be molded at a mean temperature of summation of the glass sag temperature and the glass transition temperature.

Manufacturing method for glass molded products

A manufacturing method for a glass product not having a rotatively symmetric body like an optical fiber fixing member but having a fine structure as of optical fiber engagement portions, to transfer the fine structure with a high precision without creating molding burrs, includes the steps of placing a glass material in a cavity defined by a lower mold, an upper mold, and a side mold, molding the glass material in the cavity with pressure into the glass product in so controlling that the glass material has a viscosity range of 10.sup.6.5 to 10.sup.9.5 poises at the beginning of molding operation with pressure, that the lower mold is at a temperature in a range such that the glass material indicates the above viscosity range, and that the upper and side molds are at a temperature in a range such that a converted viscosity of the glass material at the temperature of the upper and side molds is 5 to 100 times higher than the viscosity of the glass material at the temperature of the lower mold, and decreasing the temperature of the lower mold at the same time that or after the glass product begins to be molded with pressure. To produce an optical fiber fixing member, the lower mold has a mold face for molding optical fiber engagement portions of the optical fiber fixing member; the upper mold has a mold face for molding a bottom of the optical fiber fixing member; and the side mold has a mold face for molding a side face of the optical fiber fixing member.

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Saitama, Japan

Yoshiatsu Yokoo