Far-optical device
View Patent ↗A far-optical device comprising a reversal system ( 1 ) and an adjustable optical magnification means with more than fourfold magnification, wherein the far-optical device has an optical beam deflection means ( 2 ) which at all magnifications ensures a subjective field of view of the far-optical device of at least 22° at least for light of a wavelength of about 550 nm.
1. A far-optical device comprising:
a central tube disposed between an objective and an eyepiece and having a maximums outside diameter of about 35 mm;
wherein the central tube includes a lens system containing a reversal system integral with an adjustable optical magnification means,
wherein the reversal system is disposed between an objective-side image plane and an eyepiece-side image plane, wherein the objective-side image plane is between the objective and the objective-side of the reversal system and the eyepiece-side image plane is between the eyepiece and the eyepiece-side of the reversal system, and wherein the reversal system is for reproducing an intermediate image produced by the objective at the objective-side image plane with a changeable imaging scale and in an upright position at the eyepiece-side image plane and with an adjustable optical magnification having a zoom greater than four times; and
an optical beam deflection means disposed on the side of the reversal system facing the eyepiece, such that at all magnifications of the lens system, a subjective field of view of the far-optical device is at least 22°.
2. A far-optical device according to claim 1 wherein the optical beam deflection means is integrated into the lens system.
3. A far-optical device according to claim 1 wherein the zoom is at least five times.
4. A far-optical device according to claim 1 wherein the reversal system has at least two optical elements movable relative to each other.
5. A far-optical device according to claim 4 wherein the optical elements which are movable relative to each other have lens arrangements.
6. A far-optical device according to claim 1 wherein the optical beam deflection means is fixedly arranged on the side of the reversal system, which faces towards the eyepiece.
7. A far-optical device according to claim 1 wherein the optical beam deflection means has lenses which are glued together.
8. A far-optical device according to claim 1 wherein the optical beam deflection means has two lenses which are glued together.
9. A far-optical device according to claim 1 wherein the optical beam deflection means has a refractive power of between −20 dpt and −40 dpt.
10. A far-optical device according to claim 9 , wherein the refractive power is between −27 dpt and −37 dpt.
11. A far-optical device according to claim 1 wherein, at a maximum magnification of the lens system, the reversal system has a total focal length of between 11 mm and 7 mm.
12. A far-optical device according to claim 11 , wherein the total focal length is between 10 mm and 8 mm.
13. A far-optical device according to claim 1 wherein the far-optical device is a telescope or an aiming telescope.
14. A far-optical device according to claim 1 wherein, at all magnifications of the lens system, the subjective field of view is between 22° and 24° at least for light of a wavelength of about 550 nm.
15. A far-optical device according to claim 1 , wherein the reversal system includes first and second lenses movable along control grooves.
16. A far-optical device according to claim 1 wherein the reversal system has, at a maximum magnification of the lens system, a total focal length of at most 10 mm.
17. A far-optical device comprising:
a central tube disposed between an objective and an eyepiece and having a maximum outside diameter of about 35 mm;
wherein the central tube includes a lens system containing a reversal system integral with an adjustable optical magnification means,
wherein the integral reversal system is disposed between an objective-side image plane and eyepiece-side image plane, wherein the objective-side image plane is between the objective and the objective-side of the reversal system and the eyepiece-side image plane is between the eyepiece and the eyepiece-side of the reversal system, and wherein the reversal system is for reproducing an intermediate image produced by the objective at the objective-side image plane with a changeable imaging scale and in an upright position at the eyepiece-side image plane and an adjustable optical magnification having a zoom of greater than four times;
an optical beam deflection means disposed on the side of the reversal system facing the eyepiece, such that, at a maximum magnification of the lens system, a total focal length for the reversal system is at most 11 mm.
18. A far-optical device according to claim 17 , wherein, at the maximum magnification of the lens system, the total focal length for the reversal system is between 11 mm and 7 mm.
19. A far-optical device according to claim 18 wherein the total focal length is between 10 mm and 8 mm.
20. A far-optical device according to claim 17 wherein the zoom is at least five times.
21. A far-optical device according to claim 17 wherein the far-optical device is a telescope or an aiming telescope.
22. A far-optical device according to claim 17 , wherein the total focal length is at most 10 mm.