Precision press-molding preform, process for the production thereof, optical element and process for the production of the optical element

a technology of press-molding and preforms, which is applied in the direction of manufacturing tools, instruments, lenses, etc., can solve the problems of inability to produce high-quality production, inability to achieve excellent image reproduction, and reddish image obtained, etc., to achieve stable production of optical elements, excellent near infrared absorbing function, and excellent press-molding durability
US20050054511A1Inactive Publication Date: 2005-03-10HOYA CORP
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
HOYA CORP
Publication Date
2005-03-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

A precision press-molding preform for producing an optical element for use in an imaging device using a CCD type or MOS type solid image-sensing device, which is formed of a glass composition containing, by mol %, 25 to 45% of P205, 0.5 to 10% of CuO, 0 to 10% of B203, 0 to 10% of Al203, 2 to 30% of Li2O, 0 to 25% of Na2O, 0 to 15% of K2O, the total content of Li2O, Na2O and K2O being 3 to 40%, 3 to 45% of BaO, 0 to 30% of ZnO, 0 to 20% of MgO, 0 to 20% of CaO, 0 to 20% of SrO, 0 to 10% of Bi2O3, 0 to 5% of La2O3, 0 to 5% of Gd2O3 and 0 to 5% of Y2O3, the total content of these components being at least 98%, and a precision press-molding preform, which is formed of a phosphate glass containing CuO, an alkali metal oxide, BaO and ZnO and having a BaO content / ZnO content molar ratio (BaO / ZnO) of greater than 1.
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Description

FIELD OF THE INVENTION

[0001] The present invention relates to a precision press-molding preform (a preform for precision press-molding) and a process for the production thereof and also relates to an optical element and a process for the production thereof. More specifically, the present invention relates to a precision press-molding preform, the preform being formed of a phosphate glass and being for an optical element to be encased in an imaging device of a color VTR or digital camera using a solid image sensing device of a CCD (Charge-Coupled Device) type or MOS (Metal-Oxide-Semiconductor) type, and a process for the production thereof. And, it also relates to various optical elements formed from such preforms by precision press-molding, particularly, an optical element having a near infrared absorbing function, and a process for the production thereof. TECHNICAL BACKGROUND

[0002] Conventionally, most of imaging devices of digital cameras and digital VTR cameras use CCD and MOS ...

Claims

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