1. An optical glass composition comprising, in % by weight,
1.0% or more and 12.0% or less of SiO2,
8.0% or more and 18.0% or less of B2O3,
0% or more and 6.0% or less of ZnO,
1.0% or more and 10.0% or less of ZrO2,
25.0% or more and 47.0% or less of La2O3,
0% or more and 5.0% or less of R20 (here, R is at least one of Li, Na and K),
0% or more and 15.0% or less of Nb2O5,
0% or more and 7.0% or less of TiO2,
0% or more and 15.0% or less of Ta2O5,
1.0% or more of Nb2O5+TiO2+Ta2O5,
0% or more and 25.5% or less of Gd2O3,
0.5% or more and 15.0% or less of WO3 and
0.5% or more and 26.0% or less of Gd2O3+WO3, and having
a refractive index (nd) to the d-line of 1.88 or higher and 1.92 or lower and an Abbe number (\u03bdd) to the d-line of 33 or higher and 37 or lower.
2. A preform comprising the optical glass composition as claimed in claim 1, that is softened by heating so as to be used at least for press molding.
3. An optical element comprising the optical glass composition as claimed in claim 1.
4. An optical glass composition comprising, in % by weight,
1.0% or more and 12.0% or less of SiO2,
8.0% or more and 18.0% or less of B2O3,
0% or more and 6.0% or less of ZnO,
1.0% or more and 10.0% or less of ZrO2,
25.0% or more and 47.0% or less of La2O3,
0% or more and 5.0% or less of R2O (here, R is at least one of Li, Na and K),
0% or more and 15.0% or less of BaO,
0% or more and 15.0% or less of Nb2O5,
0% or more and 7.0% or less of TiO2,
0% or more and 15.0% or less of Ta2O5,
2.0% or more of Nb2O5+TiO2+Ta2O5,
0% or more and 20.0% or less of Gd2O3,
0.5% or more and 10.0% or less of WO3 and
10.0% or more and 16.0% or less of Nb2O5+WO3, and having
a refractive index (nd) to the d-line of 1.88 or higher and 1.92 or lower and an Abbe number (\u03bdd) to the d-line of 33 or higher and 37 or lower.
5. A preform comprising the optical glass composition as claimed in claim 4, that is softened by heating so as to be used at least for press molding.
6. An optical element comprising the optical glass composition as claimed in claim 4.
7. An optical glass composition comprising, in % by weight,
1.0% or more and 12.0% or less of SiO2,
8.0% or more and 18.0% or less of B2O3,
0% or more and 6.0% or less of ZnO,
1.0% or more and 10.0% or less of ZrO2,
25.0% or more and 47.0% or less of La2O3,
0.5% or more and 4.0% or less of Li2O,
0% or more and 16.0% or less of Nb2O5,
0% or more and 7.0% or less of TiO2,
0% or more and 15.0% or less of Ta2O5,
1.0% or more of Nb2O5+TiO2+Ta2O5,
0% or more and 26.0% or less of Gd2O3 and
0% or more and 15.0% or less of WO3, and having
a refractive index (nd) to the d-line of 1.88 or higher and 1.92 or lower, an Abbe number (\u03bdd) to the d-line of 33 or higher and 37 or lower and a yield temperature of 700\xb0 C. or lower.
8. A preform comprising the optical glass composition as claimed in claim 7, that is softened by heating so as to be used at least for press molding.
9. An optical element comprising the optical glass composition as claimed in claim 7.
10. An optical glass composition comprising, in % by weight,
1.0% or more and 12.0% or less of SiO2,
8.5% or more and 18.0% or less of B2O3,
0% or more and 6.0% or less of ZnO,
1.0% or more and 10.0% or less of ZrO2,
25.0% or more and 47.0% or less of La2O3,
0% or more and 5.0% or less of R2O (here, R is at least one of Li, Na and K),
0% or more and 16.0% or less of Nb2O5,
0% or more and 7.0% or less of TiO2,
0% or more and 15.0% or less of Ta2O5,
1.0% or more of Nb2O5+TiO2+Ta2O5,
0% or more and 26.0% or less of Gd2O3 and
0% or more and 13.0% or less of WO3, and
substantially not containing R\u2032O (here, R\u2032 is at least one of Ba, Sr, Ca and Mg), and having
a refractive index (nd) to the d-line of 1.88 or higher and 1.92 or lower and an Abbe number (\u03bdd) to the d-line of 33 or higher and 37 or lower.
11. A preform comprising the optical glass composition as claimed in claim 10, that is softened by heating so as to be used at least for press molding.
12. An optical element comprising the optical glass composition as claimed in claim 10.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A compressor comprising:
a closed container;
a compression element disposed in the closed container; and
a motor disposed in the closed container, the motor being configured and arranged to drive the compression element via a shaft,
the compression element including
a first bearing configured and arranged to support a first shaft portion of the shaft,
a second bearing configured and arranged to support a second shaft portion of the shaft, and
at least one cylinder disposed between the first bearing and second bearing, the at least one cylinder having at least one cylinder chamber,
the first bearing being disposed closer to the motor than the second bearing,
the first bearing having a first annular groove opened to the at least one cylinder chamber and a first annular shaped elastic portion positioned radially inside of the first annular groove provided in a first opposing surface thereof that is opposed to the at least one cylinder,
the second bearing having a second annular groove opened to the at least one cylinder chamber and a second annular shaped elastic portion positioned radially inside of the second annular groove provided in a second opposing surface thereof that is opposed to the at least one cylinder,
a diameter of the second shaft portion being smaller than a diameter of the first shaft portion, and
a rigidity of the second elastic portion being is smaller than a rigidity of the first elastic portion.
2. The compressor as claimed in claim 1, wherein
a depth of the second annular groove is larger than a depth of the first annular groove.
3. The compressor as claimed in claim 1, wherein
a first outer circumferential surface of the first elastic portion is formed into a cylindrical-surface shape so that a first diameter of the first outer circumferential surface becomes constant from a first cylinder chamber side toward a first counter cylinder chamber side, and
a second outer circumferential surface of the second elastic portion is formed into a taper shape so that a second diameter of the second outer circumferential surface gradually increases from a second cylinder chamber side toward a second counter cylinder chamber side.
4. The compressor as claimed in claim 3, wherein
a width of a second cylinder chamber side end portion of the second elastic portion is equal to or smaller than a width of a first cylinder chamber side end portion of the first elastic portion.
5. The compressor as claimed in claim 3, wherein
a width of a second cylinder chamber side end portion of the second elastic portion is smaller than a width of a first cylinder chamber side end portion of the first elastic portion.
6. The compressor as claimed in claim 1, wherein
a second cylinder chamber side width of the second annular groove is larger than a first cylinder chamber side width of the first annular groove.
7. A compressor comprising:
a closed container;
a compression element in the closed container; and
a motor disposed in the closed container, the motor being configured and arranged to drive the compression element via a shaft,
the compression element including
a first bearing configured and arranged to support a first shaft portion of the shaft,
a second bearing configured and arranged to support a second shaft portion of the shaft, and
at least one cylinder disposed between the first bearing and second bearing, the at least one cylinder having at least one cylinder chamber,
the first bearing being disposed closer to the motor than the second bearing,
the first bearing having a first annular groove opened to the at least one cylinder chamber and a first annular shaped elastic portion positioned radially inside of the first annular groove provided in a first opposing surface thereof that is opposed to the at least one cylinder,
the second bearing having a second annular groove opened to the at least one cylinder chamber and a second annular shaped elastic portion positioned radially inside of the second annular groove provided in a second opposing surface thereof that is opposed to the at least one cylinder,
a diameter of the second shaft portion being smaller than a diameter of the first shaft portion,
a rigidity of the second elastic portion being smaller than a rigidity of the first elastic portion,
a first outer circumferential surface of the first elastic portion being formed into a cylindrical-surface shape so that a first diameter of the first outer circumferential surface becomes constant from a first cylinder chamber side toward a first counter cylinder chamber side, and
a second outer circumferential surface of the second elastic portion being formed into a taper shape so that a second diameter of the second outer circumferential surface gradually increases from a second cylinder chamber side toward a second counter cylinder chamber side.
8. The compressor as claimed in claim 2, wherein
a first outer circumferential surface of the first elastic portion is formed into a cylindrical-surface shape so that a first diameter of the first outer circumferential surface becomes constant from a first cylinder chamber side toward a first counter cylinder chamber side, and
a second outer circumferential surface of the second elastic portion is formed into a taper shape so that a second diameter of the second outer circumferential surface gradually increases from a second cylinder chamber side toward a second counter cylinder chamber side.
9. The compressor as claimed in claim 2, wherein
a second cylinder chamber side width of the second annular groove is larger than a first cylinder chamber side width of the first annular groove.
10. The compressor as claimed in claim 3, wherein
a second cylinder chamber side width of the second annular groove is larger than a first cylinder chamber side width of the first annular groove.
11. The compressor as claimed in claim 4, wherein
a second cylinder chamber side width of the second annular groove is larger than a first cylinder chamber side width of the first annular groove.
12. The compressor as claimed in claim 5, wherein
a second cylinder chamber side width of the second annular groove is larger than a first cylinder chamber side width of the first annular groove.