# US 8,786,947 B2 · Far-optical device > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 8,786,947 B2 - Document ID: US8786947B2 - Status: Granted - Kind: B2 - Application number: 13/234,705 - Filed: 2011-09-16 - Published: 2012-01-12 - Granted: 2014-07-22 - Earliest claimed: 2005-07-20 - Assignees: Swarovski-Optik KG. - Applicants: Albert Fiedler - Inventors: Albert Fiedler - Web page: https://patentgrep.com/patent/US8786947B2 ## CPC - G02B 23/02: involving prisms or mirrors (G02B23/14 takes precedence) - G02B 23/00: Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices - G02B 23/145: {Zoom viewfinders} - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract A far-optical device comprising a reversal system and an adjustable optical magnification means with more than fourfold magnification, wherein the far-optical device has an optical beam deflection means 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. ## Claims ### Claim 1 A far-optical device comprising: a central tube disposed between an objective and an eyepiece and the central tube having a maximum outside diameter of about 35 mm; a reversal system disposed within the central tube and an optical magnification means integrated into the reversal system so that the optical magnification means and the reversal system are provided in one component; wherein the reversal system comprises a first optical element and a second optical element and the first optical element and the second optical element are movable relative to the central tube, and wherein by displacement of the first optical element and the second optical element of the reversal system an intermediate image produced in an objective-side image plane is reproduced with a changeable imaging scale and in an upright position at an eyepiece− side image plane and with an adjustable optical magnification having a zoom greater than four times; and an optical beam deflection means integrated into the reversal system forming a third optical element and disposed on a side of the reversal system facing the eyepiece, wherein at a maximum magnification of the far-optical device a total focal length for the reversal system is at most 11 mm, wherein the optical beam deflection means has a refractive power of between −20 dpt and −40 dpt. ### Claim 2 A far-optical device comprising: a central tube disposed between an objective and an eyepiece and the central tube having a maximum outside diameter of about 35 mm; a reversal system disposed within the central tube and an optical magnification means integrated into the reversal system so that the optical magnification means and the reversal system are provided in one component; wherein the reversal system comprises a first optical element and a second optical element and the first optical element and the second optical element are movable relative to the central tube, and wherein by displacement of the first optical element and the second optical element of the reversal system an intermediate image produced in an objective-side image plane is reproduced with a changeable imaging scale and in an upright position at an eyepiece-side image plane and with an adjustable optical magnification having a zoom greater than four times; and an optical beam deflection means integrated into the reversal system forming a third optical element and disposed on a side of the reversal system facing the eyepiece, wherein at a maximum magnification of the far-optical device a total focal length for the reversal system is at most 11 mm, wherein a ratio of a distance between the objective-side image plane and the eyepiece-side image plane to the maximum outside diameter of the central tube has a value of greater than four. ### Claim 3 A far-optical device comprising: a central tube disposed between an objective and an eyepiece and the central tube having a maximum outside diameter of about 35 mm; a reversal system disposed within the central tube and an optical magnification means integrated into the reversal system so that the optical magnification means and the reversal system are provided in one component; wherein the reversal system comprises a first optical element and a second optical element and the first optical element and the second optical element are movable relative to the central tube, and wherein by displacement of the first optical element and the second optical element of the reversal system an intermediate image produced in an objective-side image plane is reproduced with a changeable imaging scale and in an upright position at an eyepiece-side image plane and with an adjustable optical magnification having a zoom greater than four times; and an optical beam deflection means integrated into the reversal system forming a third optical element and disposed on a side of the reversal system facing the eyepiece, wherein at a maximum magnification of the far-optical device a total focal length for the reversal system is at most 11 mm, wherein a ratio of a distance between a field lens and the eyepiece-side image plane to the maximum outside diameter of the central tube has a value of greater than three. ### Claim 4 A far-optical device comprising: a central tube disposed between an objective and an eyepiece, the central tube having a maximum outside diameter of about 35 mm; a reversal system disposed within the central tube and an optical magnification means integrated into the reversal system so that the optical magnification means and the reversal system are provided in one component, wherein the reversal system comprises a first optical element and a second optical element and the first optical element and the second optical element are movable relative to the central tube, and wherein by displacement of the first optical element and the second optical element of the reversal system an intermediate image produced in an objective-side image plane is reproduced with a changeable imaging scale and in an upright position at an eyepiece-side image plane and with an adjustable optical magnification having a zoom greater than four times; and an optical beam deflection means integrated into the reversal system forming a third optical element and disposed on a side of the reversal system facing the eyepiece, such that at all magnifications of the far-optical device, a subjective field of view of the far-optical device is at least 22°. ### Claim 5 (depends on 4) A far-optical device according to claim 4, wherein the first and the second optical elements each have lens arrangements. ### Claim 6 (depends on 4) A far-optical device according to claim 4, wherein the optical beam deflection means is fixedly arranged. ### Claim 7 (depends on 4) A far-optical device according to claim 4, wherein the optical beam deflection means has lenses which are glued together. ### Claim 8 (depends on 4) A far-optical device according to claim 4, wherein the optical beam deflection means has a refractive power of between −20 dpt and −40 dpt. ### Claim 9 (depends on 4) A far-optical device according to claim 4, wherein, at a maximum magnification of the far-optical device, the reversal system has a total focal length of between 11 mm and 7 mm. ### Claim 10 (depends on 4) A far-optical device according to claim 4, wherein the far-optical device is a telescope or an aiming telescope. ### Claim 11 (depends on 4) A far-optical device according to claim 4, wherein a ratio of a distance between the objective-side image plane and the eyepiece-side image plane to the maximum outside diameter of the central tube has a value of greater than four. ### Claim 12 (depends on 4) A far-optical device according to claim 4, wherein a ratio of a distance between a field lens and the eyepiece-side image plane to the maximum outside diameter of the central tube has a value of greater than three. ### Claim 13 A far-optical device comprising: a central tube disposed between an objective and an eyepiece, the central tube having a maximum outside diameter of about 35 mm; a reversal system disposed within the central tube and an optical magnification means integrated into the reversal system so that the optical magnification means and the reversal system are provided in one component; wherein the reversal system comprises a first optical element, a second optical element and a third optical element, where the first optical element and the second optical element are movable relative to the central tube; wherein by displacement at least of the first optical element and the second optical element of the reversal system an intermediate image produced in an objective-side image plane is reproduced with a changeable imaging scale and in an upright position at an eyepiece-side image plane and with an adjustable optical magnification having a zoom greater than four times, such that at low magnifications of the far-optical device, a subjective field of view of the far-optical device is at least 22°. ### Claim 14 (depends on 13) A far-optical device according to claim 13, wherein the first and second optical elements each have lens arrangements. ### Claim 15 (depends on 13) A far-optical device according to claim 13, wherein the third optical element has lenses which are glued together. ### Claim 16 (depends on 13) A far-optical device according to claim 13, wherein the third optical element has a refractive power of between −20 dpt and −40 dpt. ### Claim 17 (depends on 13) A far-optical device according to claim 13, wherein, at a maximum magnification of the far-optical device, the reversal system has a total focal length of between 11 mm and 7 mm. ### Claim 18 (depends on 13) A far-optical device according to claim 13, wherein the far-optical device is a telescope or an aiming telescope. ### Claim 19 (depends on 13) A far-optical device according to claim 13, wherein a ratio of a distance between the objective-side image plane and the eyepiece-side image plane to the maximum outside diameter of the central tube has a value of greater than four. ### Claim 20 (depends on 13) A far-optical device according to claim 13, wherein a ratio of a distance between a field lens and the eyepiece-side image plane to the maximum outside diameter of the central tube has a value of greater than three. ### Claim 21 An aiming telescope comprising: a central tube disposed between an objective and an eyepiece, the central tube having a maximum outside diameter of about 35 mm; a reversal system disposed within the central tube and an adjustable optical magnification means with a magnification greater than four times integrated into the reversal system so that the optical magnification means and the reversal system are provided in one component, wherein the optical magnification means comprises a first optical element and a second optical element and the first optical element and the second optical element are movable relative to each other, the reversal system is disposed between an objective-side image plane and an eyepiece-side image plane, the objective-side image plane lies between the objective lens and an end of the reversal system facing the objective lens, and the eyepiece-side image plane lies between the eyepiece and an end of the reversal system facing the eyepiece, wherein by displacement of at least the first optical element and the second optical element of the reversal system an intermediate image produced in the objective-side image plane is reproduced with a changeable imaging scale and in an upright position at the eyepiece-side image plane with a maximum zoom greater than four times; and an optical beam deflection means is integrated into the reversal system, and the beam deflection means is provided in a form of an additional lens arrangement disposed on a side of the reversal system facing the eyepiece and has a negative refractive power of between −20 dpt (dioptre) and −40 dpt, such that at all magnifications at which the objective-side intermediate image is projected into the eyepiece-side image plane, a subjective field of view of the aiming telescope is at least 22°, at least for light with a wavelength of approximately 550 nm, and wherein the optical beam deflection means is disposed on a side of the eyepiece-side image plane of the aiming telescope pointing away from the eyepiece.