# US 10,768,414 B2 · Lens device for compensating aberration in the optical system and the adjustment method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,768,414 B2 - Document ID: US10768414B2 - Status: Granted - Kind: B2 - Application number: 16/028,492 - Filed: 2018-07-06 - Published: 2019-01-24 - Granted: 2020-09-08 - Earliest claimed: 2017-07-20 - Assignees: National Applied Research Laboratories - Applicants: National Applied Research Laboratories - Inventors: Cheng-Fang Ho; Wei-Jie Peng; Wei-Yao Hsu - Web page: https://patentgrep.com/patent/US10768414B2 ## CPC - G02B 27/0068: {having means for controlling the degree of correction, e.g. using phase modulators, movable elements (controlling the phase of light using moving or deformable elements G02B26/06)} - G02B 7/021: {for more than one lens} - G02B 7/026: {using retaining rings or springs (G02B7/027 takes precedence)} - G02B 27/62: Optical apparatus specially adapted for adjusting optical elements during the assembly of optical systems - G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS ## Abstract The present invention discloses a lens device suitable for the large-diameter lenses (with diameter ≥100 mm) of a vertical setup, and its adjustment method. The aberration caused by the self-gravity of lenses and the deformation generated by the clamping stress of the fixing device is compensated. ## Claims ### Claim 1 An adjustment method for lenses in a lens assembly, wherein the lens assembly includes a plurality of lenses having a total number of lenses being at least 3, the adjustment method comprising: arranging the plurality of lenses along an optical axis, wherein a light moves forward along a first direction of the optical axis; dividing at least a portion of the plurality of lenses into 2n groups, wherein n is a positive integer, the 2n groups are divided into a 1st group to a 2n-th group including n odd-numbered groups and n even-numbered groups, a j-th group of the 2n groups has m(j) lenses, j is a positive integer being no larger than 2n, m(j) is a positive integer being at least 2, the lenses in each of the 2n groups include a 1(j)st lens, . . . , an (i−1)(j)-th lens, an i(j)-th lens, . . . , and an m(j)-th lens, i is a positive integer being no larger than m(j), the odd-numbered groups from the 1st group to the (2n−1)-th group correspond sequentially to the even-numbered groups from the 2nd group to the 2n-th group, and the lenses in the odd-numbered groups correspond sequentially to the lenses in the corresponding even-numbered groups; configuring a plurality of retention devices for the plurality of lenses, wherein each of the plurality of retention devices has a corresponding lens in the plurality of lenses, each of the plurality of retention devices retains the corresponding lens through k support elements, k is a positive integer being no less than 2, the k support elements are evenly distributed around an edge of the corresponding lens, each of the k support elements has a retention position, and the retention positions of the k support elements for both the i(2n−1)-th lens of the (2n−1)-th group and the i(2n)-th lens of the 2n-th group are the same; and rotating each of the retention positions of the k support elements for the i(2n−1)-th lens, wherein an h-th support element of the k support elements for the i(2n−1)-th lens is rotated by a rotation angle α with respect to the retention position of a first support element of the k support elements for the (i−1)(2n−1)-th lens, ∝ = 360 ⁢ ° k × m ( 2 ⁢ n - 1 ) + ( h - 1 ) × 360 ⁢ ° k , where h is an integer from 1 to k, so that when observed from the optical axis, the retention positions of the k support elements for the (i−1)(2n−1)-th lens are different from the retention positions of the k support elements for the i(2n−1)-th lens, and the retention positions of the k support elements for the (i−1)(2n)-th lens are different from the retention positions of the k support elements for the i(2n)-th lens. ### Claim 2 (depends on 1) The adjustment method as claimed in claim 1, wherein each of the plurality of lenses has a diameter being no less than 100 mm. ### Claim 3 (depends on 1) The adjustment method as claimed in claim 1, wherein there is a second direction opposite to the first direction, a sequence of j for the odd-numbered groups is along the first direction, while a sequence of j for the even-numbered groups is along the second direction and a lens in the plurality of lenses other than the 2n groups is arranged in a position being one selected from a group consisting of being located between one of the odd-numbered groups and an adjacent odd-numbered group, between one of the even-numbered groups and an adjacent even-numbered group, between the odd-numbered groups and the even-numbered groups, at a starting point of the optical axis along the first direction, and at a starting point of the optical axis along the second direction. ### Claim 4 (depends on 1) The adjustment method as claimed in claim 1, wherein the optical axis is perpendicular to a horizontal plane. ### Claim 5 A lens assembly device, comprising: a plurality of lenses having a total number of lenses being at least 3, wherein the plurality of lenses are arranged along an optical axis, a light moves forward along a first direction of the optical axis, and at least a portion of the plurality of lenses are divided into 2n groups including n odd-numbered groups and n even-numbered groups, n is a positive integer, a j-th group of the 2n groups has m(j) lenses, j is a positive integer being no larger than 2n, m(j), is at least 2, the lenses in each of the 2n groups include a 1(j)st lens, . . . , an (i−1)(j)-th lens, an i(j)-th lens, . . . , and an m(j)-th lens, i is a positive integer being no larger than m(j), the odd-numbered groups from the 1st group to the (2n−1)-th group correspond sequentially to the even-numbered groups from the 2nd group to the 2n-th group, and the lenses in the odd-numbered groups correspond sequentially to the lenses in the corresponding even-numbered groups; a plurality of retention devices, wherein each of the plurality of retention devices retains an edge of a lens of the odd-numbered groups and the even-numbered groups through a plurality of support elements, the i(2n−1)-th lens has k support elements, each of the plurality of support elements has a retention position, and the retention positions of the plurality of support elements for both the i(2n−1)-th lens of the (2n−1)-th group and the i(2n)-th lens of the 2n-th group are the same; and a rotating unit coupled to the plurality of retention devices and configured to rotate the retention position of an h-th support element of the k support elements for the i(2n−1)-th lens by a rotation angle α(h) with respect to the retention position of a first support element of the k support elements for the (i−1)(2n−1)-th lens, wherein ∝ ( h ) = 360 ⁢ ° k × m ( 2 ⁢ n - 1 ) + ( h - 1 ) × 360 ⁢ ° k , where h is an integer from 1 to k, so that when observed from the optical axis, the retention position of the h-th support element of the k support elements for the i(2n−1)-th lens is the same as the retention position of the h-th support element of the k support elements for the i(2n)-th lens, and the retention position of the h−th support element for the (i−1)(2n)-th lens is different from both the retention positions of the h−th and the (h−1)-th support elements for the i(2n)-th lens. ### Claim 6 (depends on 5) The lens assembly device as claimed in claim 5, wherein each of the plurality of lenses has a diameter being no less than 100 mm. ### Claim 7 (depends on 5) The lens assembly device as claimed in claim 5, wherein a pair of corresponding lenses in the plurality of lenses are symmetric lenses. ### Claim 8 (depends on 5) The lens assembly device as claimed in claim 5, wherein each of the plurality of lenses has a material property of a Young's modulus to specific gravity ratio, and a pair of corresponding lenses in the plurality of lenses have a difference of the material properties being within ±20%. ### Claim 9 (depends on 5) The lens assembly device as claimed in claim 5, wherein a pair of corresponding lenses in the plurality of lenses have a difference of diameters being within ±20%. ### Claim 10 (depends on 5) The lens assembly device as claimed in claim 5, wherein a pair of corresponding lenses in the plurality of lenses are both double-convex lenses, and the pair of corresponding lenses have a difference of diameters being within ±10%. ### Claim 11 (depends on 5) The lens assembly device as claimed in claim 5, wherein a pair of corresponding lenses in the plurality of lenses have a difference of radii of curvature being within ±30%. ### Claim 12 (depends on 5) The lens assembly device as claimed in claim 5, wherein a pair of corresponding lenses in the plurality of lenses are both double-convex lenses, and the pair of corresponding lenses have a difference of radii of curvature being within ±10%. ### Claim 13 (depends on 5) The lens assembly device as claimed in claim 5, wherein each of the plurality of lenses has an aspect ratio being a diameter to center thickness ratio, and a pair of corresponding lenses in the plurality of lenses have a difference of the aspect ratios being within ±20%. ### Claim 14 (depends on 5) The lens assembly device as claimed in claim 5, wherein each of the plurality of lenses has an aspect ratio being a diameter to center thickness ratio, a pair of corresponding lenses in the plurality of lenses are both double-convex lenses, and the pair of corresponding lenses have a difference of the aspect ratios being within ±10%. ### Claim 15 (depends on 5) The lens assembly device as claimed in claim 5, wherein each of the plurality of retention devices has a ring structure and is configured in a sub lens barrel for a lens to load the lens, and the plurality of support elements are configured on the ring structure. ### Claim 16 A lens assembly device, comprising: a plurality of lenses arranged sequentially along an optical axis; and a plurality of retention devices for respectively retaining the plurality of lenses, wherein: each of the plurality of retention devices includes a plurality of support elements for retaining an edge of the respective lens under a relatively lowest stress; the plurality of support elements for a first lens in the plurality of lenses have a first retention position combination; the plurality of support elements for a second lens in the plurality of lenses have a second retention position combination; there is a rotation angle α between the first retention position combination and the second retention position combination; and both the first lens and the second lens belong to a first group in the plurality of lenses, and the rotation angle α is calculated from α = 360 ⁢ ° k × m + l × 360 ⁢ ° k , wherein there are m lenses in the first group, there are k support elements for each of the first and the second lenses, and l is an integer. ### Claim 17 (depends on 16) The lens assembly device as claimed in claim 16, wherein k=3. ### Claim 18 (depends on 16) The lens assembly device as claimed in claim 16, wherein there is a second group in the plurality of lenses, the second group includes a third lens and a fourth lens, the first through the fourth lenses are arranged sequentially along the optical axis, the plurality of support elements for the third lens have a third retention position combination, the plurality of support elements for the fourth lens have a fourth retention position combination, the first and the fourth retention position combinations are the same, and the second and the third retention position combinations are the same. ### Claim 19 (depends on 18) The lens assembly device as claimed in claim 18, wherein an aberration due to a gravity is compensated.