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Optical glass and optical element

A technology for optical glass and optical components, applied in optical components, optics, instruments, etc., can solve the problems of difficult to discharge bubbles and insufficient clarification.

Active Publication Date: 2016-10-05
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the case of glass with poor meltability as described above, a sufficient amount of gas components does not remain in the cullet, so it is difficult to grow tiny bubbles into large bubbles, and it is difficult to discharge the tiny bubbles to the outside of the molten glass.
Therefore, sufficient clarification cannot be performed, resulting in a problem that minute air bubbles remain in the optical glass as a product

Method used

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  • Optical glass and optical element
  • Optical glass and optical element
  • Optical glass and optical element

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment approach

[0079] (Composition expressed in % by mass)

[0080] Hereinafter, the glass composition is expressed based on oxides.

[0081] The optical glass of the first embodiment of the present invention is the following optical glass, wherein,

[0082] The ratio of RE1 to NWF1 [RE1 / NWF1] is 0.35 or more,

[0083] The ratio of HR1 to RE1 [HR1 / RE1] is 0.33 or less,

[0084] Nb 2 o 5 content relative to Nb 2 o 5 and Ta 2 o 5 The mass ratio of the total content of [Nb 2 o 5 / (Nb 2 o 5 +Ta 2 o 5 )] is more than 2 / 3,

[0085] The ratio [RE1 / D1] of RE1 to D1 is 0.90 or more,

[0086] The ratio [L1 / (NWF1+RE1)] of L1 to the total value of NWF1 and RE1 is 0.78 or more,

[0087] Abbe's number νd is not less than 39.0 and not more than 45.0, and the above-mentioned Abbe's number νd and refractive index nd satisfy the following formula (1),

[0088] nd≥2.235-0.01×νd···(1)

[0089] in,

[0090] When M(B 2 o 3 ), M(SiO 2 ), M (Al 2 o 3 ), M (La 2 o 3 ), M(Gd 2 o 3 ), M(Y ...

no. 2 Embodiment approach

[0304] (Composition in % of cations)

[0305] In this embodiment (2nd embodiment), the optical glass of this invention is demonstrated based on content of each component represented by cation % as a 2nd viewpoint of this invention. Therefore, unless otherwise specified below, each content is represented by cation %.

[0306] In addition, in this specification, expressing with cation % means expressing the content of each glass component when the total content of all cationic components is 100% with respect to each glass component expressed as a cation, and expressing it in molar percentage. In addition, the total content refers to the total amount of the content (including the case where the content is 0%) of a plurality of cationic components. In addition, the cation ratio refers to the ratio (ratio) of the contents of cation components (including the total content of a plurality of cation components) represented by cation %.

[0307] In addition, the valency of cat...

Embodiment 1

[0426] The glass composition and characteristic value of the optical glass (samples 1-23) of the Example of this invention are shown in Table 5A-7A and Table 5B-7B.

[0427] Here, in Tables 5A to 7A, the glass compositions of Samples 1 to 23 are represented by mass %, and in Tables 5B to 7B, the glass compositions of Samples 1 to 23 are represented by % of cations. That is, although the expression method of the glass composition differs in Tables 5A-7A and Tables 5B-7B, the optical glass of the same sample number means the same optical glass which has the same composition. Therefore, Tables 5A to 7A and Tables 5B to 7B substantially show the same optical glasses and their results. The same applies to Tables 8A and 8B and Tables 9A and 9B to be described later.

[0428] In addition, in Tables 5B to 9B, the glass composition is expressed in terms of cation %, but all anion components are O 2- . That is, for the compositions described in Tables 5B to 9B, O 2- The cont...

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Abstract

The invention provides optical glass capable of reducing a raw material cost and other production costs, having excellent meltability and thermal stability, having a low-temperature softening property and having a high index of refraction and low chromatic dispersion. The invention also provides an optical element made of the optical glass and an optical glass material. In the optical glass, a ratio [RE1 / NWF1] of RE1 to NWF1 is 0.35 or above, a ratio [HR1 / RE1] of HR1 to the RE1 is 0.33 or below, the mass ratio [Nb2O5 / (Nb2O5+Ta2O5)] of the content of Nb2O5 to the sum of contents of the Nb2O5 and Ta2O5 is 2 / 3 or above, a ratio [RE1 / D1] of the RE1 to D1 is 0.90 or above, a ratio [L1 / (NWF1+RE1)] of L1 to the sum of the NWF1 and the RE1 is 0.78 or above, the Abbe number [nu]d is 39.0 or above and 45.0 or below, and the index of refraction nd and the Abbe number [nu]d meet an equation (1) that is nd >= 2.235-0.01*[nu]d.

Description

technical field [0001] The invention relates to an optical glass with high refractive index and low dispersion, which can reduce manufacturing cost and has excellent meltability and thermal stability. The invention also relates to an optical element made of such an optical glass. Background technique [0002] Generally, optical glass with high refractive index and low dispersion contains rare earth oxides such as boron oxide and lanthanum oxide. In such optical glass, in order to increase the refractive index without reducing the Abbe number, it is necessary to increase the content of rare earth oxides. However, when the content of rare earth oxides is increased in such optical glass, the thermal stability of the glass decreases, and the glass crystallizes during the glass manufacturing process, making it difficult to obtain transparent glass (the glass devitrifies). Therefore, when the refractive index is increased without reducing the Abbe number, it becomes difficult to...

Claims

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Application Information

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IPC IPC(8): C03C3/068C03C3/155C03C4/00G02B1/00
CPCG02B1/00C03C3/068C03C3/155C03C4/00
Inventor 武藤秀树藤原康裕
Owner HOYA CORP
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