Im folgenden Patent beschreibt Sony ein Vollformat-Zoom, dessen äußere Eckwerte 2,8/24-70mm und innerer optischer Aufbau mit 17 Linsen (zwei davon mit asphärischen Oberflächen) dem Sony Carl Zeiss Vario-Sonnar T* 2,8/24-70mm ZA SSM (SAL-2470Z) extrem nahe kommen.
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http://www.google.de/patents/US7817346
ZITATZoom lens and image capture apparatus
Tetsuya Arimoto et al
Patent number: 7817346
Filing date: 25 Sep 2007
Issue date: 19 Oct 2010
Application number: 11/902,722
Abstract
A zoom lens includes, in an order from an object side, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, and in which, during power variation from a wide-angle end to a telephoto end, a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and the zoom lens includes at least one cemented-triplet lens block having negative refractive power, in the fourth lens group.
Inventors: Tetsuya Arimoto, Yasushi Yamamoto
Original Assignee: Sony Corporation
Primary Examiner: Jordan M. Schwartz
Attorney: Rader, Fishman & Grauer PLLC
Current U.S. Classification: 359/687; 359/683
Claims
1. A zoom lens, comprising, in an order from an object side:
a first lens group having positive refractive power;
a second lens group having negative refractive power;
a third lens group having positive refractive power; and
a fourth lens group having positive refractive power, and wherein:
during power variation from a wide-angle end to a telephoto end, a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and
the zoom lens includes in the fourth lens group at least one cemented-triplet lens block having negative refractive power,
wherein the following conditional formula (2) is satisfied:
0.8 < f2 / fw < -0.2,
where:
f2 represents a composite focal length of the second lens group, and
fw represents a composite focal length of a total system at the wide-angle end.
2. The zoom lens according to claim 1, wherein the cemented-triplet lens block includes, in an order from the object side, a lens having negative refractive power; a lens having positive refractive power; and a lens having negative refractive power.
3. The zoom lens according to claim 1, wherein the cemented-triplet lens block has at least one aspherical surface.
4. The zoom lens according to claim 3, wherein the aspherical surface is formed on a surface closest to an image-plane side of the cemented-triplet lens block.
5. The zoom lens according to claim 1, wherein the following conditional formula (1) is satisfied:
0.3 < Ld1 - Ld2 < 0.6
where:
Ld1 represents a refractive index of a lens positioned closest to the object side of the cemented-triplet lens block, and
Ld2 represents a refractive index of a second lens counted from the object side of the cemented-triplet lens block.
6. An image capture apparatus having a zoom lens and an imager device for converting an optical image formed by the zoom lens into an electrical signal, wherein:
the zoom lens includes, in following order from an object side:
a first lens group having positive refractive power;
a second lens group having negative refractive power;
a third lens group having positive refractive power; and
a fourth lens group having positive refractive power, and
during power variation from a wide-angle end to a telephoto end, a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and
the zoom lens includes in the fourth lens group at least one cemented-triplet lens block having negative refractive power,
wherein the following conditional formula (2) is satisfied:
-0.8 < f2 / fw < -0.2
where:
f2 represents a composite focal length of the second lens group, and
fw represents a composite focal length of a total system at the wide-angle end.
7. The image capture apparatus according to claim 6, wherein the cemented-triplet lens block includes, in an order from the object side, a lens having negative refractive power; a lens having positive refractive power; and a lens having negative refractive power.
8. The image capture apparatus according to claim 6, wherein the cemented-triplet lens block has at least one aspherical surface.
9. The image capture apparatus according to claim 8, wherein the aspherical surface is formed on a surface closest to an image-plane side of the cemented-triplet lens block.
10. The image capture apparatus according to claim 6, wherein the following conditional formula (1) is satisfied:
0.3 < Ld1 - Ld2 < 0.6
where:
Ld1 represents a refractive index of a lens positioned closest to the object side of the cemented-triplet lens block, and
Ld2 represents a refractive index of a second lens counted from the object side of the cemented-triplet lens block.[/quote]
und
http://www.google.de/patents/US20080198475
http://www.google.de/patents/US20080165428
ZITATZoom lens and image capture apparatus
Tetsuya Arimoto et al
Application number: 11/902,723
Publication number: US 2008/0165428 A1
Filing date: 25 Sep 2007
Abstract
There is provided a zoom lens including, in an order from an object side: a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power. During zooming from a wide-angle end to a telephoto end, the first lens group, the third lens group, and the fourth lens group move toward an object side such that a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and the zoom lens satisfies the following conditional formulae (1) and (2):
Inventors: Tetsuya Arimoto, Yasushi Yamamoto
Original Assignee: Sony Corporation
Current U.S. Classification: 359/687
Claims
1. A zoom lens comprising, in an order from an object side:
a first lens group having positive refractive power;
a second lens group having negative refractive power;
a third lens group having positive refractive power; and
a fourth lens group having positive refractive power, and wherein:
during zooming from a wide-angle end to a telephoto end, the first lens group, the third lens group, and the fourth lens group move toward an object side such that a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and
the zoom lens satisfies the following conditional formulae (1) and (2):
1.8 < f3 / fw < 5, and
-2.5 < 2 x D3 / f2 < -1.5,
where:
f3 represents a composite focal length of the third lens group,
fw represents a composite focal length of a total system at a wide-angle end,
D3 represents a height from an optical axis of axial rays passing through a surface closest to the object side of the third lens group at a telephoto end, and
f2 represents a composite focal length of the second lens group.
2. The zoom lens according to claim 1, wherein the following conditional formula (3) is satisfied:
0.8 < f2 / fw < -0.2,
3. The zoom lens according to claim 1, wherein the following conditional formula (4) is satisfied:
1.2 < β2w / β2t < 1.7,
where:
β2w represents a transverse magnification at the wide-angle end, and
β2t represents a transverse magnification at the telephoto end.
4. The zoom lens according to claim 1, comprising at least one lens using a glass member whose refractive index is not less than 1.9, in any of the third lens group and the fourth lens group.
5. The zoom lens according to claim 1, wherein focusing is performed by moving the second lens group along the optical axis.
6. The zoom lens according to claim 1, comprising at least one aspherical surface within the second lens group.
7. An image capture apparatus comprising a zoom lens and an image sensor for converting an optical image formed by the zoom lens into an electrical signal, wherein:
the zoom lens includes, in an order from an object side:
a first lens group having positive refractive power;
a second lens group having negative refractive power;
a third lens group having positive refractive power; and
a fourth lens group having positive refractive power,
during zooming from a wide-angle end to a telephoto end, the first lens group, the third lens group, and the fourth lens group move toward an object side such that a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and
the zoom lens satisfies the following conditional formulae (1) and (2):
1.8 < f3 / fw < 5, and
-2.5 < 2 x D3 / f2 < −1.5,
where:
f3 represents a composite focal length of the third lens group,
fw represents a composite focal length of a total system at a wide-angle end,
D3 represents a height from an optical axis of axial rays passing through a surface closest to the object side of the third lens group at a telephoto end, and
f2 represents a composite focal length of the second lens group.[/quote]
Was meint ihr? Handelt es sich hier wirklich um das SAL-2470Z?
Das Ganze ist natürlich insofern brisant, als daß ein Objektiv, das dem klingenden Namen und den Werbeaussagen nach von Zeiss entwickelt worden sein will, natürlich nicht von Sony patentiert werden kann. In einer Patentschrift müssen immer die tatsächlichen Erfinder/Entwickler genannt werden, ansonsten kann ein Patent mit Leichtigkeit gekippt werden. Tetsuya Arimoto und Yasushi Yamamoto haben früher für Minolta und Konica Minolta Objektive entwickelt und tun dies nun offenbar für Sony. Siehe auch:
http://www.mi-fo.de/forum/viewtopic.php?t=26432
Viele Grüße,
Matthias