# US 9,519,155 B2 · Optical system, imaging apparatus and method for manufacturing the optical system > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,519,155 B2 - Document ID: US9519155B2 - Status: Granted - Kind: B2 - Application number: 13/994,757 - Filed: 2011-12-14 - Published: 2014-01-30 - Granted: 2016-12-13 - Earliest claimed: 2010-12-17 - Assignees: Nikon Corporation - Applicants: Satoru Shibata - Inventors: Satoru Shibata - Web page: https://patentgrep.com/patent/US9519155B2 ## CPC - G02B 27/646: {compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68)} - G02B 15/144105: {arranged +-+-} - G02B 15/144109: {arranged +--+} - G02B 15/144511: {arranged -+-+} - G02B 15/145121: {arranged +-+-+} - G02B 15/173: arranged +-+ - Y10T 29/49826: Assembling or joining - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract An optical system comprises a first lens element and a second lens element which are respectively shiftable to have a component in a direction perpendicular to the optical axis, the second lens element being composed of the first lens element and other lens element, and the first lens element or the second lens element being shifted to have a component in a direction perpendicular to the optical axis, thereby carrying out a correction of the image plane. Thus, there are provided an optical system having a suitable vibration reduction property, an image apparatus equipped with the optical system and a method for manufacturing the optical system. ## Claims ### Claim 1 An optical system comprising a first lens element which is shiftable to have a component in a direction perpendicular to the optical axis and a second lens element which is shiftable to have a component in a direction perpendicular to the optical axis, said second lens element comprising said first lens element and other lens element, and said first lens element or said second lens element being shifted to have a component in a direction perpendicular to the optical axis, said first lens element being shifted relative to said other lens element upon said first lens element shifting thereby carrying out a correction of the image plane. ### Claim 2 (depends on 1) An optical system according to claim 1, wherein the first lens element and the second lens element are respectively shiftable to have a component in a direction perpendicular to the optical axis, and in said second lens element, said first lens element and said other lens element have refractive powers having the same sign. ### Claim 3 (depends on 1) An optical system according to claim 1, wherein the following conditional expression is satisfied: |fB|<|fA| where |fA| denotes an absolute value of a focal length of the first lens element, |fB| denotes an absolute value of a focal length of the second lens element, and fA and fB have the same sign. ### Claim 4 (depends on 1) An optical system according to claim 1, wherein the following conditional expression is satisfied: 0.24<|fB|/|fA|<1.00 where |fA| denotes an absolute value of a focal length of the first lens element, |fB| denotes an absolute value of a focal length of the second lens element, and fA and fB have the same sign. ### Claim 5 (depends on 1) An optical system according to claim 1 further comprising a third lens element which is shiftable to have a component in a direction perpendicular to the optical axis, and wherein any one lens element among said first lens element, said second lens element and said third lens element is shifted to have a component in a direction perpendicular to the optical axis, thereby performing a correction of the image plane. ### Claim 6 (depends on 5) An optical system according to claim 5, wherein said third lens element is composed of said second lens element and other lens element that has refractive power of the same sign as that of refractive power of said second lens element. ### Claim 7 (depends on 5) An optical system according to claim 5, wherein the following conditional expression is satisfied: |fC|<|fB|<|fA| where |fA| denotes an absolute value of a focal length of the first lens element, |fB| denotes an absolute value of a focal length of the second lens element, |fC| denotes an absolute value of a focal length of the third lens element, and fA, fB and fC have the same sign. ### Claim 8 (depends on 5) An optical system according to claim 5, wherein the following conditional expression is satisfied: 0.24<|fC|/|fA|<1.00 where |fA| denotes an absolute value of a focal length of the first lens element, |fC| denotes an absolute value of a focal length of the second lens element, and fA and fC have the same sign. ### Claim 9 (depends on 5) An optical system according to claim 5, wherein said third lens element comprises a cemented lens. ### Claim 10 (depends on 1) An optical system according to claim 1, wherein said first and said second lens elements comprise a cemented lens. ### Claim 11 (depends on 1) An optical system according to claim 1, comprising at least four lens groups, at least said first and said second lens elements are included in any one lens group among said four lens groups. ### Claim 12 (depends on 11) An optical system according to claim 11, comprises in order from the object side, a first lens group, a second lens group, a third lens group, and a fourth lens group, wherein upon zooming, a distance between said first lens group and said second lens group, a distance between said second lens group and said third lens group, and a distance between said third lens group and said fourth lens group, are varied. ### Claim 13 (depends on 1) An optical system according to claim 1, wherein the first lens element and the second lens element are shiftable respectively to have a component in a direction perpendicular to the optical axis, and in said second lens element, said first lens element and said other lens element have refractive powers having different signs from each other. ### Claim 14 (depends on 1) An optical system according to claim 1, wherein the following conditional expression is satisfied: |fA|<|fB| where |fA| denotes an absolute value of a focal length of the first lens element, |fB| denotes an absolute value of a focal length of the second lens element, and fA and fB have different signs from each other. ### Claim 15 (depends on 1) An optical system according to claim 1, wherein the following conditional expression is satisfied: 0.24<|fA|/|fB|<1.00 where |fA| denotes an absolute value of a focal length of the first lens element, |fB| denotes an absolute value of a focal length of the second lens element, and fA and fB have different signs from each other. ### Claim 16 (depends on 1) An imaging apparatus equipped with an optical system according to claim 1. ### Claim 17 (depends on 1) An optical system according to claim 1, wherein each of said first and said second lens elements comprises a cemented lens. ### Claim 18 A method for manufacturing an optical system comprising a first lens element and a second lens element, including steps of: composing said second lens element by said first lens element and other lens element, disposing said first lens element to be shiftable such that a component in a direction perpendicular to the optical axis is included, and said second lens element to be shiftable such that a component in a direction perpendicular to the optical axis is included, said first lens element is shifted relative to said other lens element upon said first lens element shifting, and composing said first lens element and said second lens element such that a correction of an image blur may be performed by shifting either said first lens element or said second lens element to have a component in a direction perpendicular to the optical axis. ### Claim 19 (depends on 18) A method for manufacturing an optical system according to claim 18, comprising the first lens element and the second lens element which are shiftable respectively to have a component in a direction perpendicular to the optical axis, and in said second lens element, said first lens element and said other lens element have refractive powers having the same sign. ### Claim 20 (depends on 18) A method for manufacturing an optical system according to claim 18, wherein the following conditional expression is satisfied: |fB|<|fA| where |fA| denotes an absolute value of a focal length of the first lens element, |fB| denotes an absolute value of a focal length of the second lens element, and fA and fB have the same sign. ### Claim 21 (depends on 18) A method for manufacturing an optical system according to claim 18, further comprising a third lens element which is shiftable to have a component in a direction perpendicular to the optical axis, and wherein any one lens element among said first lens element, said second lens element and said third lens element is shifted to have a component in a direction perpendicular to the optical axis, thereby performing the correction of the image plane. ### Claim 22 (depends on 18) A method for manufacturing an optical system according to claim 18, comprising the first lens element and the second lens element which are shiftable respectively to have a component in a direction perpendicular to the optical axis, and in said second lens element, said first lens element and said other lens element have refractive powers having different signs from each other. ### Claim 23 (depends on 18) A method for manufacturing an optical system according to claim 18, wherein the following conditional expression is satisfied: |fB|<|fA| where |fA| denotes an absolute value of a focal length of the first lens element, |fB| denotes an absolute value of a focal length of the second lens element, and fA and fB have different signs from each other.