Patent US3859200A successfully refreshed from Google Patents.
US4880299A
Expired / Lapsed
US
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Telecentric fθ lens system for laser COM
Assignee: Minolta Co Ltd
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Filing: 1988-07-07
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Granted: 1989-11-14
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Expires: 2008-07-07
Abstract
Abstract A telecentric f theta lens system for use in a laser COM comprising, from the object field side, a first lens unit including at least one negative lens component for generating a large negative distortion, a second lens unit consisting of one or two positive lens components for compensating spherical aberration and astigmatism generated by the first lens unit, a third lens unit including at least one positive lens component for providing a telecentric characteristic and a fourth lens unit including three or four lens components for providing a small F number.
Inventors
- 👤 Akiyoshi Hamada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 16:16
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/22; G02B13/0005
Claims Analysis
Total Claims: 39
Claim 1
Independent Claim
100 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to image side: a first lens unit including a negative lens component; a second lens unit consisting of a positive lens component; a third lens unit including a positive lens component; and a fourth lens unit including three lens components, of which two lens components are a negative and a positive lens component aligned in order from the object side and the final lens component from the object side is positive, wherein said lens components are respectively spaced from each other on an optical axis.
Claim 2
Dependent Claim
100 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to image side: a first lens unit including a negative lens component; a second lens unit consisting of a positive lens component; a third lens unit including a positive lens component; and a fourth lens unit including three lens components, of which two lens components are a negative and a positive lens component aligned in order from the object side and the final lens component from the object side is positive, wherein said lens components are respectively spaced from each other on an optical axis.
Claim 3
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 1 wherein the fourth lens unit includes a positive lens component, a negative lens component and a positive lens component in order from the object field side.
Claim 4
Dependent Claim
119 words
A telecentric fθ lens system as claimed in claim 1 further fulfilling the following conditions: 0≦f/r A <1 0.6<f/r B <1 0≦-f/r C <1 0.4<f/d D <0.7 wherein f is a total focal length of the lens system, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit and d D is an axial distance of the whole lens system.
Claim 5
Dependent Claim
40 words
A telecentric fθ lens system as claimed in claim 1 further comprising a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction.
Claim 6
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 1, wherein the fourth lens unit includes two positive lens components, a negative lens component and a positive lens component, in order from the object field side.
Claim 7
Dependent Claim
97 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of a positive lens component; a third lens unit including a positive lens component; a fourth lens unit including three lens components; and a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction; wherein one lens surface of the third lens unit is an anamorphic surface.
Claim 8
Dependent Claim
97 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of a positive lens component; a third lens unit including a positive lens component; a fourth lens unit including three lens components; and a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction; wherein one lens surface of the third lens unit is an anamorphic surface.
Claim 9
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 6 wherein the fourth lens unit includes a positive lens component, a negative lens component and a positive lens component in order from the object field side.
Claim 10
Dependent Claim
132 words
A telecentric fθ lens system as claimed in claim 6 further fulfilling the following conditions: 0≦f M /r A <1 0.6<f M /r B <1 0≦-f M /r C <1 0.4<f M /d D <0.7 wherein f M is a total focal length of the lens system in the meridional direction, r A is a radius of curvature of the image field side surface of the negative lens in the first lens component unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit and d D is an axial distance of the whole lens system.
Claim 11
Dependent Claim
132 words
A telecentric fθ lens system as claimed in claim 6, further fulfilling the following conditions: 0≦f M /r A <1 0.6<f M /r B <1 0≦-f M /r C <1 0.4<f M /d D <0.6 wherein f M is a total focal length of the lens system in the meridional direction, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit, and d D is an axial distance of the whole lens system.
Claim 12
Dependent Claim
59 words
A telecentric fθ lens system as claimed in claim 6, further fulfilling the following conditions: f S <f M 0.4<-β S <0.8 wherein: f S =a total focal length of the lens system in the sagittal direction, f M =a total focal length of the lens system in the meridional direction, β S =a magnification in the sagittal direction.
Claim 13
Dependent Claim
101 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of two positive lens components; a third lens unit including a positive lens component, and a fourth lens unit including three lens components, of which two lens components are a negative and a positive lens component aligned in order from the object side and the final lens component from the object side is positive, wherein said lens components are respectively spaced from each other on an optical axis.
Claim 14
Dependent Claim
101 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of two positive lens components; a third lens unit including a positive lens component, and a fourth lens unit including three lens components, of which two lens components are a negative and a positive lens component aligned in order from the object side and the final lens component from the object side is positive, wherein said lens components are respectively spaced from each other on an optical axis.
Claim 15
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 11, wherein the fourth lens unit includes a positive lens component, a negative lens component and a positive lens component in order from the object field side.
Claim 16
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 11, wherein the fourth lens unit includes two positive lens components, a negative lens component and a positive lens component in order from the object field side.
Claim 17
Dependent Claim
119 words
A telecentric fθ lens system as claimed in claim 11, further fulfilling the following conditions: 0≦f/r A <1 0.6<f/r B <1 0≦-f/r C <1 0.4<f/d D <0.7 wherein f is a total focal length of the lens system, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit, and d D is an axial distance of the whole lens system.
Claim 18
Dependent Claim
40 words
A telecentric fθ lens system as claimed in claim 11, further comprising a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction.
Claim 19
Dependent Claim
97 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of a positive lens component; a third lens unit including a positive lens component; a fourth lens unit including three lens components, and a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction, wherein one lens surface of the fourth lens unit is an anamorphic surface.
Claim 20
Dependent Claim
97 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of a positive lens component; a third lens unit including a positive lens component; a fourth lens unit including three lens components, and a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction, wherein one lens surface of the fourth lens unit is an anamorphic surface.
Claim 21
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 16, wherein the fourth lens unit includes a positive lens component, a negative lens component and a positive lens component in order from the object field side.
Claim 22
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 16, wherein the fourth lens unit includes two positive lens components, a negative lens component and a positive lens component in order from the object field side.
Claim 23
Dependent Claim
132 words
A telecentric fθ lens system as claimed in claim 16, further fulfilling the following conditions: 0≦f M /r A <1 0.6<f M /r B <1 0≦-f M /r C <1 0.4<f M /d D <0.7 wherein f M is a total focal length of the lens system in the meridional direction, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit, and d D is an axial distance of the whole lens system.
Claim 24
Dependent Claim
132 words
A telecentric fθ lens system as claimed in claim 16, further fulfilling the following conditions: 0≦f M /r A <1 0.6<f M /r B <1 0≦-f M /r C <1 0.4<f M /d D <0.6 wherein f M is a total focal length of the lens system in the meridional direction, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit, and d D is an axial distance of the whole lens system.
Claim 25
Dependent Claim
60 words
A telecentric fθ lens system as claimed in claim 16, further fulfilling the following conditions: f s <f M 0.4<-β s <0.8 wherein: f s =a total focal length of the lens system in the sagittal direction, f M =a total focal length of the lens system in the meridional direction, and β s =a magnification in the sagittal direction.
Claim 26
Dependent Claim
97 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of two positive lens components; a third lens unit including a positive lens component; a fourth lens unit including three lens components, and a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction, wherein one lens surface of the third lens unit is an anamorphic surface.
Claim 27
Dependent Claim
97 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of two positive lens components; a third lens unit including a positive lens component; a fourth lens unit including three lens components, and a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction, wherein one lens surface of the third lens unit is an anamorphic surface.
Claim 28
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 22, wherein the fourth lens unit includes a positive lens component, a negative lens component and a positive lens component in order from the object field side.
Claim 29
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 22, wherein the fourth lens unit includes two positive lens components, a negative lens component and a positive lens component in order from the object field side.
Claim 30
Dependent Claim
132 words
A telecentric fθ lens system as claimed in claim 22, further fulfilling the following conditions: 0≦f M /r A <1 0.6<f M /r B <1 0≦-f M /r C <1 0.4<f M /d D <0.7 wherein f M is a total focal length of the lens system in the meridional direction, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit, and d D is an axial distance of the whole lens system.
Claim 31
Dependent Claim
132 words
A telecentric fθ lens system as claimed in claim 22, further fulfilling the following conditions: 0≦f M /r A <1 0.6<f M /r B <1 0≦-f M /r C <1 0.4<f M /d D <0.6 wherein f M is a total focal length of the lens system in the meridional direction, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit, and d D is an axial distance of the whole lens system.
Claim 32
Dependent Claim
60 words
A telecentric fθ lens system as claimed in claim 22, further fulfilling the following conditions: f s <f M 0.4<-β s <0.8 wherein: f s =a total focal length of the lens system in the sagittal direction, f M =a total focal length of the lens system in the meridional direction, and β s =a magnification in the sagittal direction.
Claim 33
Dependent Claim
97 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of two positive lens components; a third lens unit including a positive lens component; a fourth lens unit including three lens components, and a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction, wherein one lens surface of the fourth lens unit is an anamorphic surface.
Claim 34
Dependent Claim
97 words
A telecentric fθ lens system for use in a laser COM comprising, from the object to the image side: a first lens unit including a negative lens component; a second lens unit consisting of two positive lens components; a third lens unit including a positive lens component; a fourth lens unit including three lens components, and a fifth lens unit of an anamorphic characteristic in which a refractive power thereof in the sagittal direction is larger than a refractive power in the meridional direction, wherein one lens surface of the fourth lens unit is an anamorphic surface.
Claim 35
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 28, wherein the fourth lens unit includes a positive lens component, a negative lens component and a positive lens component in order from the object field side.
Claim 36
Dependent Claim
36 words
A telecentric fθ lens system as claimed in claim 28, wherein the fourth lens unit includes two positive lens components, a negative lens component and a positive lens component in order from the object field side.
Claim 37
Dependent Claim
132 words
A telecentric fθ lens system as claimed in claim 28, further fulfilling the following conditions: 0≦f M /r A <1 0.6<f M /r B <1 0≦-f M /r C <1 0.4<f M /d D <0.7 wherein f M is a total focal length of the lens system in the meridional direction, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit, and d D is an axial distance of the whole lens system.
Claim 38
Dependent Claim
132 words
A telecentric fθ lens system as claimed in claim 28, further fulfilling the following conditions: 0≦f M /r A <1 0.6<f M /r B <1 0≦-f M /r C <1 0.4<f M /d D <0.6 wherein f M is a total focal length of the lens system in the meridional direction, r A is a radius of curvature of the image field side surface of the negative lens component in the first lens unit, r B is a radius of curvature of the object field side surface of the positive lens component in the third lens unit, r C is a radius of curvature of the object field side surface of the negative lens component in the fourth lens unit, and d D is an axial distance of the whole lens system.
Claim 39
Dependent Claim
60 words
A telecentric fθ lens system as claimed in claim 28, further fulfilling the following conditions: f s <f M 0.4<-β s <0.8 wherein: f s =a total focal length of the lens system in the sagittal direction, f M =a total focal length of the lens system in the meridional direction, and β s =a magnification in the sagittal direction.
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