Hoya Corporation

Yoshitake Tanno

Mikio Ikenishi

Naomi Matsumoto

Kinobu Osakabe

Yutaka Takakubo

Shinji Eda

Toshiki Nakamura

Koichi Sato

Masaru Eguchi

Yuki Shiota

Isao Tanaka

Akihiro Shoji

Yasushi Tsutsumi

Provided is oxide glass in which a content of Pis 7 to 43 cation %, a content of Nb ions is 10 to 21 cation %, a content of Liis 20 cation % or more, a total content of Nb ions and Liis 48 to 70 cation %, a content of Bi ions is more than 0 cation % and is equal to or less than 6 cation %, a content of Bais 5 cation % or less, a content of Zris 2 cation % or less, a total content of Ti ions and W ions is 5 cation % or less, and a cation ratio of the content of Lito a total content of Li, Na, and K[Li/(Li+Na+K)] is 0.5 or more.

Glass and optical element

[Problem] To provide glass having a colored layer. [Solution] Glass having a colored layer.

Glass including a small-transmittance portion and a large-transmittance portion

An optical element includes a glass body including a colored layer provided inside the glass body and positioned at an optical function surface of the optical element. An optical apparatus including the optical element is also provided.

Optical element and optical apparatus

A ring-shaped glass spacer is configured to be arranged in contact with a magnetic disk in a hard disk drive apparatus. A surface resistivity of a surface of a glass material of the glass spacer at 22 (&#xb0; C.) is lower than a surface resistivity of an inner portion of the glass material at 22 (&#xb0; C.).

Glass spacer, hard disk drive apparatus, and method for manufacturing glass spacer

An optical element including a glass body is provided. The optical element includes a colored layer provided inside the glass body and positioned outside an effective aperture of the optical element. Coloring of the colored layer is a reduction pigment occurring in a glass component of the glass body. The colored layer suppresses occurrence of stray light and obtains sufficient light-shielding properties, so that a superior image quality can be achieved.

A glass material of a glass spacer has a surface resistivity of 10to 10(&#x3a9;/sq) at 22 (&#xb0; C.). The surface resistivity of a surface of the glass material of the glass spacer at 22 (&#xb0; C.) is lower than the surface resistivity of an inner portion of the glass material at 22 (&#xb0; C.). The glass spacer contains at least one oxide selected from the group consisting of TiO, NbO, WO, and BiO, as a glass component.

A glass lens blank for polishing in which a thickness of a defect-containing layer is suppressed to a minimum and thus it is possible to shorten the processing time required for grinding and polishing the glass lens blank for polishing after press-molding, a method of manufacturing the same, and a method of manufacturing an optical lens. A glass lens blank for polishing of which at least a main surface is a press-molding surface, wherein a defect-containing layer formed on the main surface has a thickness of 50 &#x3bc;m or less.

Glass lens blank for polishing, manufacturing method therefore, and optical lens manufacturing method

To provide a fluorophosphates glass having a weather-resistant property and having an O/Pratio even after production, which is set so that Cucan be added with a quantity of such a degree suppressing an absorption of a visible light while absorbing a near-infrared light, and a method for producing the same, and a near-infrared light absorbing filter, wherein a molar ratio of a content of Owith respect to a content of P(O/P) in the fluorophosphates glass, is 3.2 or more and less than 3.4, and a molar ratio of a content of Fwith respect to a total content of Oand F(F/(O+F)) in the fluorophosphates glass is 0.05 or more and 0.25 or less.

Fluorophosphate glass and method for producing the same and near-infrared absorbing filter

Provided are an optical fluorophosphate glass having excellent optical characteristics and also excellent processability, a glass material for press molding and an optical element each including the glass, and methods for producing the glass material and the optical element. The optical glass includes Pas a cationic component and Oand Fas anionic components, wherein the optical glass has a content of Fof 40 anionic % or less, an abrasion factor Fof 420 or higher, and a fragility index value B of 4500 &#x3bc;mor lower.

Optical glass, glass material for press molding, optical element, method for producing glass material for press molding, and method for producing optical element

Growing community of inventors

Akishima, Japan

Yoshitake Tanno