Seikoh Giken Co., Ltd.

Tatsuya Fujiwara

Kunio Yamada

Takehiko Narita

Tomomi Hirao

Yuichi Arai

Tsuguo Satoh

A junction type compound lens using glass and resin is used. By properly controlling the difference between refractive indices and the difference between Abbe numbers of the resin and glass, interface reflection that occurs when a ray with a large incidence angle is incident is restricted, and generation of a flare or a ghost image is restricted. Further, by properly controlling the difference in refractive index and the difference in Abbe number, various aberrations, such as spherical aberration, field curvature, and chromatic aberration, which may deteriorate optical performance, can be corrected. Thus, a small and high-performance imaging lens can be provided.

Imaging lens

A ferrule heating apparatus, which is configured to heat a ferrule and thereby adhere an optical fiber and the ferrule together, includes a plurality of ferrule housing portions capable of freely housing and aligning ferrules, a holdermade of a thermally conductive member, a holder heating unitfor supporting and heating the holder, and a temperature control unitfor controlling a temperature of the holder heating unit. The holder heating unitand the temperature control unitare provided mutually separately. Meanwhile, the holder heating unitand the temperature unitare mutually connected to each other through an electric power cable

Ferrule heating apparatus and method of adhering ferrule and optical fiber

A holder for an optical fiber ferrule end face grinding apparatus is provided which can grind an increased number of optical fiber ferrules simultaneously. The holder comprises a holder plate provided with a plurality of ferrule insertion holes, a seat extending to at least one insertion hole and having a first wall, and a second wall on a side of the insertion hole opposing the seat. A slidable holding member including a front face facing the second wall, and an inclined rear face is disposed on the seat. A depression member is mounted on the holder plate that presses downwardly on a rod member disposed on the inclined rear face. As the depression member is operated, the rod member is pressed downwardly along the first wall, and the holding member is pushed forward such that a ferrule is clamped between the front face and the second wall.

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Matsudo, Japan

Tatsuya Fujiwara