Konica-minolta Holdings, Inc.

Konica Corporation

Crestec Corporation

Kazumi Furuta

Osamu Masuda

Masahiro Morikawa

Hiroshi Miyakoshi

Makiko Imae

Yukihiro Ozeki

Koji Horii

Kazuhiko Kobayashi

Koujirou Sekine

Kazuo Shiozawa

Mitsuru Yokoyama

Hiroaki Ueda

Manami Kuiseko

Yuichi Akanabe

Kunito Hayashi

Naoki Mitsugi

Yoshiki Shibuya

Akiko Kuji

The present invention is provided to obtain an inexpensive bidirectional optical module wherein a diffraction efficiency can be maximized at different diffraction order for light beam with different wavelength, and light usage efficiency is enhanced. The bidirectional optical module includes a light-emitting element for transmitting an optical signal toward an end of an optical fiber; a light-receiving element for receiving an optical signal from the end of the optical fiber; and a grating in which stair shapes are repeated with a predefined pitch. In the bidirectional optical module, a phase function is defined as phase-difference contour lines which is formed by making two light fluxes from predetermined positions interfere with each other on a surface arranged at a position of the grating. A planar pitch of the grating is formed such that values of the phase function form phase contour lines each representing an integer multiple of 360 degrees.

Bi-directional optical module

A producing method of an optical element such as quarter-wave plate wherein preparing a first member which has a coefficient of elasticity of 1-4 (GPa) at normal temperature, setting the temperature of a die having microscopic shape with high aspect ratio to be higher than the glass transition temperature of the first member and pressing the die against the first member to transfer a microscopic shape on the first member, a microstructure is formed on the first member. In the same manner, a second microstructure is formed on a second member. Afterwards, by connecting the first member and the second member, an optical element in which the first member and the second member are connected having microstructures with high aspect ratio face each other, is obtained.

Optical element producing method and optical element

A article having a micro-sized shape being formed on the surface of the article by pressing a die onto the surface, wherein the elastic modulus of the article at room temperature is in the range of 1-4 GPa, the thickness of the article after forming is equal to 0.1 mm or more and 20 mm or less and the aspect ratio of the micro-sized shape is equal to 1 or more. A forming method to produce an article comprising the steps of setting the temperature of a die having a micro sized shape to be equal or higher than the glass transitional temperature of material having an elastic modulus of 1 to 4 (GPa) pressing the die to the material to transfer the micro sized shape to the material, and cooling the die having the micro sized shape.

Forming methods, forming devices for articles having a micro-sized shape and optical elements

An optical element holding structure, having: an optical element including an optical section having optical function, an outer peripheral portion which is positioned at the outer peripheral side of the optical section and a mounting portion which protrudes from the outer peripheral portion in a direction substantially parallel to the optical axis; and a lens barrel holding the optical element inside.

Optical element holding structure, optical element lens-barrel and optical communication module

There is described a molding method for molding a product, having a microscopic structure of high aspect ratio. The molding method includes the steps of: setting a temperature of a mold, having a microscopic shape, at a value higher than a glass transition temperature of a material being deformable with heat; pushing the mold against the material at a first velocity, after the material is positioned opposite to the mold so that the microscopic shape contacts the material; pushing the mold against the material at a second velocity being faster than the first velocity; and releasing the mold from the material. The pushing pressure for pushing the mold against the material at the first velocity is equal to or smaller than a half of that for pushing the mold against the material at the second velocity.

Molding method, cooling apparatus and optical element

A wide-band wave plate having at least two wave plates, each of which has a microstructure to generate a phase difference, the microstructure having a cycle not shorter than 1/nof a shortest wavelength of light in use, wherein the two wave plates are arranged to face opposite with their main axes in non-parallel with each other, wherein nis a refractive index of a wave plate material with respect to the shortest wavelength.

Wide-band wave plate and a controlling method thereof

There is described a method for depicting a predetermined pattern, such as a diffraction pattern employed in an optical element, on a substrate. The method includes the steps of: acquiring shape data of the predetermined pattern; generating a first input signal for deflecting an electron beam emitted from an electron gun in a main-scanning direction, and a second input signal for deflecting the electron beam in a sub-scanning direction, based on the shape data of the predetermined pattern; adjusting an alternating bias signal, having a specific frequency, according to the shape data of the predetermined pattern; superposing the alternating bias signal on the second input signal; and deflecting the electron beam emitted from the electron gun in the sub-scanning direction according to the second input signal on which the alternating bias signal is superposed, while scanning the electron beam by deflecting it in a main-scanning direction.

Electron beam depicting method, mother die manufacturing method, mother die, metallic mold manufacturing method, metallic mold and optical element

A article having a micro-sized shape being formed on the surface of the article by pressing a die onto the surface, wherein the elastic modulus of the article at room temperature is in the range of 1&#x2013;4 GPa, the thickness of the article after forming is equal to 0.1 mm or more and 20 mm or less and the aspect ratio of the micro-sized shape is equal to 1 or more. A forming method to produce an article comprising the steps of setting the temperature of a die having a micro sized shape to be equal or higher than the glass transitional temperature of material having an elastic modulus of 1 to 4 (GPa) pressing the die to the material to transfer the micro sized shape to the material, and cooling the die having the micro sized shape.

An echelon type diffraction structureis formed on the flat optical surface of a lens, thereby ensuring easy designing and easy production of a diffraction structure as a microstructure. Further, the light of wavelength &#x3bb;is applied to the diffraction structurein a tilted position with respect to the optical axis of the lensso that the first order diffracted light produced by the diffraction structuretravels along or parallel to the optical axis of the lens, with the result that improved light transmittance can be maintained. Further, a lensis arranged between a light emitting deviceand lens. Thus, the flat optical surface of the lensis arranged on the side of the end faceof an optical fiber, thereby reducing the deterioration in aberration more effectively.

Optical communication module

A method of producing an optical element forming die, includes the steps of: cutting a base member to form a base optical surface of the base member while rotating the base member; cutting an outer circumferential surface of the base member so that an optical axis of the base optical surface is identical to a rotation center of the outer circumferential surface of the base member while rotating the base member; forming an optical surface having a predetermined pattern onto the base optical surface of the base member; forming an electroforming mold having an optical transfer surface complementary to the optical surface of the base member by electroforming wherein the electroforming is conducted with the base member; and cutting an outer circumferential surface of the electroforming mold on the basis of the outer circumferential surface of the base member.

Producing method for optical element molding die and producing method for optical element

An optical bidirectional modulehaving therein light emitting elementwhich transmits optical signal to the end facet of the optical fiber, light receiving elementwhich receives optical signal from the end facet of the optical fiber and stair-shaped multi-level grating, wherein the stair-shaped multi-level grating separates the first light path between the end facet of optical fiber and the light emitting element and the second light path between the end facet of optical fiber and the light receiving element by a different wavelength of each optical signal, when the module mixes and separates optical signal with different wavelengths traveling in opposite directions related to the end facet of the optical fiberused for bidirectional optical fiber communication by means of a wavelength multiplex system.

Optical bidirectional module

A pattern drawing method of drawing a desired pattern on a base material by irradiating an electronic beam and scanning the base material with the electronic beam with a predetermined dose amount, comprising: a first step of drawing a first region on the base material by scanning with the electronic beam with a first dose amount; a second step of drawing a second region on the base material by scanning with the electronic beam with a second dose amount; and a inclining step of inclining a boundary between the first region and the second region to form an inclined surface by conducting a first scanning to scan with the electronic beam with the first dose amount and a second scanning to scan with the electronic beam with the second does amount in a mixed arrangement.

Pattern drawing method by scanning beam and pattern drawing apparatus

A method of drawing a pattern on a base material by scanning a beam, comprising: drawing a pattern including ring-shaped zones on a first pattern-drawn field on a base material by scanning a beam on a first pattern-drawn field; shifting at least one of the beam source and the base material to scan the beam on a second pattern-drawn field located next to the first pattern-drawn field in such a way that a boundary between the first pattern-drawn field and the second pattern-drawn field is positioned at a joint portion between a slope portion and a side wall portion of the ring-shaped zones; and drawing the pattern on the second pattern-drawn field by scanning a beam so that the joint portion between the slope portion and the side wall portion is drawn at the boundary between the first pattern-drawn field and the second pattern-drawn field.

Method of drawing a pattern on a base material by scanning a beam

The present invention aims at providing a device and method for writing a line with a high degree of precision at high speed. Distance calculation meanscalculates the start-to-end point distance L of a writing pattern (S), and number-of-scan-clocks calculating meanscalculates the number of scan clocks required to write the writing pattern based on the start-to-end point distance L and a unit distance corresponding to the minimum time resolution for a high-speed D/A converter(S). Count conversion meansseparates the start-to-end point distance L into X and Y components to convert them in an equation using the number of scan clocks (S). Based on the equation, variable rate calculating meanscalculates an extinction ratio to determine the extinction ratio at a variable attenuator(S). ATT D/A converterspecifies the extinction ratio at the attenuatorto reduce the unit distance corresponding to the resolving power of the high-speed D/A converterso that an electron beam will be irradiated and scanned at intervals of the reduced unit distance to perform writing.

Electron-beam writing device and electron-beam writing method

A method of coating a coating liquid on a base material having a curved surface portion, includes processes of: a coating process of coating a coating liquid on a base material; and a rotating process of rotating the base material coated with the coating liquid.

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Akishima, Japan

Kazumi Furuta