Citizen Watch Company, Ltd.

Citizen Finedevice Co., Ltd.

Shinshu University

Totoku Electric Co., Ltd

Emit Seiko Co., Ltd.

Citizen Holdings Company, Ltd.

Simshu University

Toshiya Kubo

Mitsunori Miyamoto

Nobutoshi Takeda

Tohru Mizuhashi

Takeyasu Nakayama

Yoshihiro Matsuoka

Hidetoku Iida

Kazuhiko Terao

Jiro Horigome

Toshiroh Sato

Makoto Sonehara

Toshiro Sato

Tomoo Ikeda

Izumi Yamamoto

Takashi Maruyama

Keisuke Kigawa

Isao Arai

Akiko Katoh

Kazuhiro Toriumi

Akihiro Shioji

Taichi Tsuchiya

Hiroshi Miyauchi

Kazuo Murata

Maki Takizawa

Sadao Horiuchi

Yuta Fujishiro

Tomoyuki Nakazawa

A magnetic field sensor head includes an optical fiber, a GI fiber whose one end is optically connected to the optical fiber, a magnetic film joined to the other end of the GI fiber, a reflection film joined to a surface of the magnetic film opposite to a surface joined to the magnetic film, and a support member joined to a surface of the reflection film opposite to the surface joined to the magnetic film.

Magnetic field sensor head and method for manufacturing same

A magnetic field sensor elementincludes a light emitteremitting a first linearly polarized light, a first optical elementemitting a first linearly polarized wave and the second linearly polarized wave in response to a first linearly polarized light incident, and emitting a second linearly polarized light in response to a third linearly polarized wave and the a linearly polarized wave incident, at least one pair of magnetic field sensor elementscapable of disposing in a predetermined magnetic field across the measured conductor, having a light transmissive, changing the phase of transmitted light in accordance with the magnetic field, and fixing a relative position therebetween, an optical pathincluding a first optical path propagating the first linearly polarized wave and the fourth linearly polarized wave, and a second optical path propagating the second linearly polarized wave and the third linearly polarized wave, and connected to the first optical element and the magnetic field sensor element, a detected signal generatoroutputting a detected signal corresponding to the magnetic field, by receiving two components of the second linearly polarized light, and converting to the electrical signal, and an optical branching element transmitting the first linearly polarized light to the first optical element and branching the second linearly polarized light to the detected signal generator.

Interference type optical magnetic field sensor device

An interference type optical magnetic field sensor devicehas a light emitteremitting first linearly polarized light, a first optical elementemitting a first linearly polarized wave and a second linearly polarized wave orthogonal to the first linearly polarized wave with respect to incident the first linearly polarized light, and emitting a second linearly polarized light with respect to incident third linearly polarized wave and a forth linearly polarized wave orthogonal to the third linearly polarized wave, a magnetic field sensor elementdisposed at least a portion thereof within a predetermined magnetic field an optical path unitconnected to the first optical element and the magnetic field sensor element, and having a first optical path propagating the first linearly polarized wave and the forth linearly polarized wave, and a second optical path propagating the second linearly polarized wave and the third linearly polarized wave, a detection signal generatoroutputting a detection signal by separating the second linearly polarized light into an S polarization component and a P polarization component, converting the S polarization component and the P polarization component into an electric signal, and an optical branching elementtransmitting the first linearly polarized light to the first optical element, and branching the second linearly polarized light to the detection signal generator, wherein the magnetic field sensor element emits the first linearly polarized wave and the second linearly polarized wave as incident light, and emits the third linearly polarized wave with respect to the first linearly polarized wave and the forth linearly polarized wave with respect to the second linearly polarized wave as return light.

Interference type photomagnetic field sensor device

To provide a magnetic sensor element and a magnetic sensor device that can be easily manufactured and can reduce a loss of light to the extent possible. The above-described problem is solved by a magnetic sensor element comprising a planar lightwave circuit () provided with a light branching part (), an input optical fiber () and an output optical fiber () connected to the planar lightwave circuit (), a metal magnetic body type light transmitting film () that is provided on one end surface of the planar lightwave circuit () and transmits light entered from the input optical fiber (), and a reflecting film () that is provided on the metal magnetic body type light transmitting film () and reflects the transmitted light. The output optical fiber () is a polarization-plane maintaining optical fiber, and the input optical fiber () and the output optical fiber () are aligned and connected to the planar lightwave circuit ().

Magnetic sensor element and magnetic sensor device

A piezoelectric device has a piezoelectric vibration element mounted in a package wherein the piezoelectric vibration element comprises two stick-like vibration legs; a central leg provided between the two vibration legs; a coupling portion that couples one end of each of the two vibration legs and one end of the central leg; and a protrusion portion that is coupled to another end of the central leg, has a predetermined angle, neither 0 nor 180 degrees, to the length direction of the central leg, and extends into a direction not interfering with the driving legs. In making the piezoelectric device smaller and thinner, this configuration avoids interference between a support point on the central leg, provided for supporting the vibration element, and conductive electrodes, improves insulation between the conductive electrodes, and reduces the generation of short-circuits between the conductive electrodes.

Package structure of a piezoelectric device mounting and supporting a piezoelectric vibration element

The end face of an optical fiber assembly consisting of an optical fiber s and a ferrule f is polished to form a conical surface with oblique faces Fp1 and Fp2 such that, central axis Ap of the conical surface makes an inclination of 8.degree. with respect to the optical axis L of the optical fiber s, top Ft of the conical surface coincides with the optical axis L of the optical fiber s, and has a taper angle of 2.degree.. Thereafter, the optical fiber assembly is further polished to form an oblique convex spherical surface at the end face such that, the central axis of the oblique convex spherical surface makes an inclination of 8.degree. with respect to the optical axis L of the optical fiber s. Due to this, insertion loss and light reflected back to the source is stabilized and minimized.

Method for manufacturing optical fiber assembly with polished end-face,

End face of a ferrule 100 is polished to form a conical surface 3 such that, central axis Ap of said conical surface 3 makes an inclination of 8.degree. with respect to central axis L of optical fiber insertion hole 4, top 3t of said conical surface 3 coincides with said central axis L and has a taper angle of 2.degree.. Because of this, while polishing an end of a optical fiber inserted and fixed inside said optical fiber insertion hole 4, a well balanced oblique spherical surface can be formed and the non-coincidence of the center of said oblique convex surface with the point where said oblique convex surface intersect with the optical axis of said optical fiber can be prevented.

End-face polished ferrule and its method of manufacture

Growing community of inventors

Nagano, Japan

Toshiya Kubo