Agc Inc.

Rakuten, Inc.

Canon Kabushiki Kaisha

Asahi Glass Company, Limited

Yusuke Fujiwara

Izuru Kashima

Kiyoshi Tamai

Daisuke Kobayashi

Yuichi Suzuki

Yoichi Sera

Michinori Suehara

Taku Yamada

Kaname Sekiya

Kiyoshi Nitto

Taro Murakami

Yosuke Fukai

Lilin Zhou

Soh Masuko

Yusuke Kobayashi

Yuji Imoto

Shigaku Iwabuchi

Masao Ozeki

Junichiro Iwamatsu

Takumi Nagasako

Naoki Uemura

Noriko Tanabe

Yasuko Furuta

Yoichi Takato

Yusuke Morishima

A lens apparatus attachable to an image pickup apparatus includes a first optical system, a second optical system, and a driving unit that moves at least one of the first optical system and the second optical system in an optical axis direction. The lens apparatus is configured to switch between a first driving mode for performing autofocus by moving both the first optical system and the second optical system in optical axis directions of the first optical system and the second optical system via the driving unit, and a second driving mode for adjusting a difference in imaging position for a same object image between the first optical system and the second optical system by moving the at least one of the first optical system and the second optical system in the optical axis direction via the driving unit.

Lens apparatus and image pickup apparatus capable of switching between driving modes

A control apparatus for a camera system that includes a lens apparatus including a first optical system and a second optical system and configured to move them relative to each other, and an image pickup apparatus including an image sensor and detachably attachable to the lens apparatus includes a processor configured to acquire a first evaluation value of the first optical system at a first focus detection position corresponding to the first optical system, determine a second focus detection position corresponding to the second optical system based on an first object image formed by the first optical system and a second object image formed by the second optical system, acquire a second evaluation value of the second optical system at the second focus detection position, and move the first optical system and the second optical system based on the first evaluation value and the second evaluation value.

Control apparatus, lens apparatus, image pickup apparatus, camera system, and control method

A chemically strengthened glass has a thickness of more than 2 mm, a surface compressive stress CSof 400 MPa to 1200 MPa, a depth of compressive stress layer DOL-tail of 2.7 μm to 30.0 μm, an absolute value of an average slope of a stress profile from a surface to the DOL-tail of 20 MPa/μm to 500 MPa/μm, and a tensile stress CT of 1.0 MPa to 16 MPa.

Chemically strengthened glass and method for manufacturing same

The present invention relates to a chemically strengthened glass having a thickness t (mm), in which a first-order derivative CS' of a stress value CS(MPa) is −4.7 or larger in a range of CS≥0 in a profile of the stress value CS(MPa), in which the stress value CS(MPa) is a function of depth x (μm) from a glass surface, and in which the stress value CS(MPa) is measured by a scattered light photoelastic stress meter, and a manufacturing method thereof.

Chemically strengthened glass and manufacturing method thereof

The present invention relates to a chemically strengthened glass including alkali metal ions, having a thickness of 0.20 mm or smaller, and having a pair of major surfaces that are opposed to each other and have been subjected to a chemically strengthening treatment, in which at least one of the pair of major surfaces has a core roughness depth Sk of 0.90 nm or smaller and a mean summit curvature Ssc of 13.0×10/nm or smaller.

Chemically strengthened glass and manufacturing method of chemically strengthened glass

The present invention relates to a chemically strengthened glass having a thickness t (mm), in which a first-order derivative CS' of a stress value CS(MPa) is −4.7 or larger in a range of CS≥0 in a profile of the stress value CS(MPa), in which the stress value CS(MPa) is a function of depth×(μm) from a glass surface, and in which the stress value CS(MPa) is measured by a scattered light photoelastic stress meter, and a manufacturing method thereof.

The purpose of the present invention is to provide a chemically-strengthened glass exhibiting both surface strength and abrasion-resistant anti-fingerprint (AFP) properties. The present invention relates to a plate-shaped chemically-strengthened glass which has a compressive stress layer provided to a glass surface layer, a glass surface hydrogen concentration profile in a specific range, and a surface strength and abrasion-resistant anti-fingerprint (AFP) properties which are in specific ranges.

Chemically-strengthened glass

The purpose of the present invention is to provide a chemically strengthened glass in which reduction in glass surface strength is effectively suppressed even without performing a polishing treatment after a prolonged chemical strengthening treatment has been conducted at a high temperature. The present invention relates to a chemically strengthened glass having a specific glass composition, wherein: the surface roughness (Ra) is a specific value or greater; the compressive stress layer depth of a surface layer is a specific value or greater; by setting the hydrogen concentration in the glass surface layer to be within a specific range, the surface strength of the glass is dramatically improved even without performing an etching treatment using hydrofluoric acid or polishing the glass surface after a prolonged chemical strengthening treatment has been conducted at a high temperature.

Chemically strengthened glass

The present invention relates to a chemically strengthened glass having a thickness of t [mm], and having a profile of a stress value CS[MPa] at a depth x [&#x3bc;m] from a surface of the glass, the stress value being measured by a scattered-light photoelastic stress meter, in which a second-order differential value CS&#x2033; of the stress value CSin the profile satisfies the following expression within a range of CS&#x2265;0: 0&#x3c;CS&#x2033;&#x2264;0.050.

Chemically strengthened glass, and method for manufacturing the same

An object of the present invention is to provide a chemically strengthened glass that can effectively suppress strength of a glass from being deteriorated even though performing chemical strengthening and has high transmittance (that is, low reflectivity). The present invention relates to a chemically strengthened glass having a compressive stress layer formed on a surface layer thereof by an ion exchange method, in which the glass contains sodium and boron, and has a delta transmittance being +0.1% or more, and in which a straight line obtained by a linear approximation of a hydrogen concentration Y in a region of a depth X from an outermost surface of the glass satisfies a specific relational equation in X=0.1 to 0.4 (&#x3bc;m).

Chemically strengthened glass and production method for chemically strengthened glass

An object of the present invention is to provide a chemically strengthened glass having enhanced surface strength and bending strength. The present invention relates to a chemically strengthened glass having a compressive stress layer formed on a surface layer thereof by an ion exchange method, in which a straight line obtained by a linear approximation of a hydrogen concentration Y in a region of a depth X from an outermost surface of the glass satisfies a specific relational equation (I) in X=0.1 to 0.4 (&#x3bc;m), and an edge surface connecting main surfaces on a front side and a back side of the glass has a skewness (Rsk) measured based on JIS B0601 (2001) being &#x2212;1.3 or more.

Chemically strengthened glass and production method for same

A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which the glass has a surface roughness (Ra) of 0.20 nm or higher, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (&#x3bc;m), a surface strength F (N) measured by a ball-on-ring test under the following conditions is (F&#x2265;1500&#xd7;t) relative to a sheet thickness t (mm) of the glass, and a surface of the glass has no polishing flaw:&#x2003;&#x2003;(I)in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as HO, mol/L); X: depth from the outermost surface of the glass (&#x3bc;m); a: &#x2212;0.270 to &#x2212;0.005; and b: 0.020 to 0.220.

A chemically strengthened glass having a compressive stress layer formed in a surface layer thereof according to an ion exchange method, in which a surface of the glass has polishing flaws, the glass has a texture direction index (Stdi) of 0.30 or more, a hydrogen concentration Y in a region to a depth X from an outermost surface of the glass satisfies the following relational equation (I) at X=from 0.1 to 0.4 (&#x3bc;m), and a surface strength F (N) measured by a ball-on-ring test is (F&#x2265;1400&#xd7;t) relative to a sheet thickness t (mm) of the glass:&#x2003;&#x2003;(I)in which meanings of respective symbols in the equation (I) are as follows: Y: hydrogen concentration (as HO, mol/L), X: depth from the outermost surface of the glass (&#x3bc;m), a: &#x2212;0.300 or more, and b: 0.220 or less.

Growing community of inventors

Tokyo, Japan

Yusuke Fujiwara