A fisheye lens, comprising a front group made up of a total of three groups, which are two concave lenses 1 and 2 whose concave surfaces are directed toward the image side, and a compound lens 3 whose concave surface is directed toward the image side and which has an overall convex or concave refrac
A fisheye lens, comprising a front group made up of a total of three groups, which are two concave lenses 1 and 2 whose concave surfaces are directed toward the image side, and a compound lens 3 whose concave surface is directed toward the image side and which has an overall convex or concave refractive power; and a rear group formed by three groups of convex lenses 4, 5, and 6, wherein the front group includes at least one compound lens set, the rear group includes one compound lens set, and at least a first surface of a first concave lens 1 of the front group is an aspheric surface, and satisfies specific conditions. As a result, it is possible to obtain a fisheye lens that can realize a foveal optical system with undiminished illuminance all the way to the periphery and with high resolution over the entire field of view, and with which a wide field of view and an extremely compact size can be attained with a single wide-angle optical system.
대표청구항▼
The invention claimed is: 1. A fisheye lens with an angle of incidence of at least 60 degrees, comprising a front group made up of a total of three groups, which are, in order from the object side, two concave lenses whose concave surfaces are directed toward the image side, and a compound lens who
The invention claimed is: 1. A fisheye lens with an angle of incidence of at least 60 degrees, comprising a front group made up of a total of three groups, which are, in order from the object side, two concave lenses whose concave surfaces are directed toward the image side, and a compound lens whose concave surface is directed toward the image side and which has an overall convex or concave refractive power; and a rear group formed by three groups of convex lenses, wherein the front group includes at least one compound lens set, the rear group includes only one compound lens set, and at least a first surface of a first concave lens of the front group is an aspheric surface, and satisfies the following conditions: (1) The aspheric first surface of the first concave lens of the front group either is expressed by the formula X=G(Y), where the origin is the apex of the aspheric surface, X is the optical axis direction, and Y is a direction perpendicular to the optical axis (a positive value), or is expressed as a functional approximation by the formula dx/dY>0 within the range of Ymax>Y>0.5f, where Ymax is the maximum value of the effective radius of the lens, and f is the focal distance of the lens system overall, (2) When the projection function of the lens is taken using h=f*sin ω as a reference scale, the distortion aberration V when the incidence angle ω is 60 degrees is such that-10%≧V≧-16%. Here, V=(H-h)*100/h (%), and H represents the height of the image from the optical axis when the incidence angle ω is 60 degrees. 2. The fisheye lens according to claim 1, wherein the above-mentioned G(Y) is expressed by the following formula: The type of aspheric surface here is a rotational aspheric surface whose center of rotation is around the optical axis. Furthermore, R1 is the radius of curvature of the first surface of the first concave lens, κ and Ki are constants, N is a natural number, and ai is an integer or a real number greater than 1. 3. The fisheye lens according to claim 2, wherein the above-mentioned G(Y) is expressed by the following formula: The type of aspheric surface here is a rotational aspheric surface whose center of rotation is around the optical axis. Furthermore, R1 is the radius of curvature of the first surface of the first concave lens, and κ, A, B, C, D, E, and F are constants. 4. The fisheye lens according to claim 1, wherein (3) and (4) below are satisfied: (3) If we let the focal distance of the front group be fF,-0.8f>fF>-1.5f, (4) If we let the back focus on the front side of the rear group be BFr, 0<BFr<0.2f. 5. The fisheye lens according to claim 4, wherein the second convex lens of the rear group is a cemented lens consisting of three lenses, which are convex, concave, and convex, in that order from the object side, and if we let f ou be the focal distance of the concave lens, the following relationship is satisfied: (5)-1.2f<f ou<-0.9f. 6. The fisheye lens according to claim 1, wherein the second convex lens of the rear group is a cemented lens consisting of three lenses, which are convex, concave, and convex, in that order from the object side, and the compound concave lens in the middle is a lens made of a transmissive member with a higher refractive index and higher dispersion than the compound convex lens on the image side. 7. An imaging device that has the fisheye lens according to claim 1, has the function of acquiring an image with an electronic imaging device, further has at least one mechanism out of a pan mechanism, a tilt mechanism, and a rotation mechanism, and can be operated by electrical signals or dynamically. 8. An imaging device that has the fisheye lens according to claim 1, is equipped with an electronic imaging device, and further has the function of recording or storing at least one of a captured image, the time, the direction, and the device's own coordinates, the function of identifying a subject, and the function of directing a target close to the center of the field of view according to an internal or external signal. 9. An imaging device that makes use of a plurality of fisheye lenses having the same specifications as the fisheye lens according to claim 1, wherein parallax can be utilized to acquire distance information about at least a specific place. 10. An imaging device that makes use of a plurality of the fisheye lenses according to claim 1, wherein a multi-lens has a convergence mechanism. 11. A fisheye lens with an angle of incidence of at least 60 degrees, comprising a front group made up of a total of three groups, which are, in order from the object side, two concave lenses whose concave surfaces are directed toward the image side, and a compound lens whose concave surface is directed toward the image side and which has an overall convex or concave refractive power; and a rear group formed by three groups of convex lenses, wherein the front group includes at least one compound lens set, the rear group includes two or more compound lens sets, and at least a first surface of a first concave lens of the front group is an aspheric surface, and satisfies the following conditions: (6) The aspheric first surface of the first concave lens of the front group either is expressed by the formula X=G(Y), where the origin is the apex of the aspheric surface, X is the optical axis direction, and Y is a direction perpendicular to the optical axis (a positive value), or is expressed as a functional approximation by the formula dx/dY>0 within the range of Ymax>Y>0.5f, where Ymax is the maximum value of the effective radius of the lens, and f is the focal distance of the lens system overall, (7) When the projection function of the lens is taken using h=f*sin ω as a reference scale, the distortion aberration V when the incidence angle ω is 60 degrees is such that-10%≧V≧-16%, here, V=(H-h)*100/h (%), and H represents the height of the image from the optical axis when the incidence angle ω is 60 degrees. 12. The fisheye lens according to claim 11, wherein the above-mentioned G(Y) is expressed by the following formula: The type of aspheric surface here is a rotational aspheric surface whose center of rotation is around the optical axis. Furthermore, R1 is the radius of curvature of the first surface of the first concave lens, κ and Ki are constants, N is a natural number, and ai is an integer or a real number greater than 1. 13. The fisheye lens according to claim 12, wherein the above-mentioned G(Y) is expressed by the following formula: The type of aspheric surface here is a rotational aspheric surface whose center of rotation is around the optical axis. Furthermore, R1 is the radius of curvature of the first surface of the first concave lens, and κ, A, B, C, D, E, and F are constants. 14. The fisheye lens according to claim 11, wherein (8) and (9) below are satisfied: (8) If we let the focal distance of the front group be fF,-0.8f>fF>-1.5f, (9) The radius of curvature R of the compound surface of the second-group convex lens of the rear group is such that 1.0f<R<1.4f. 15. The fisheye lens according to claim 11, wherein the second convex lens of the rear group is a cemented lens consisting of two lenses, which are concave and convex, in that order from the object side, the concave lens is a lens made of a transmissive member with a higher refractive index and higher dispersion than the convex lens on the image side, and if we let f ou be the focal distance of the concave lens, then-1.5f<f ou<-0.8f. 16. The fisheye lens according to claim 11, wherein the third convex lens of the rear group is a cemented lens consisting of two lenses, which are convex and concave, in that order from the object side, and the concave lens is a lens made of a transmissive member with a higher refractive index and higher dispersion than the convex lens. 17. An imaging device that has the fisheye lens according to claim 11, has the function of acquiring an image with an electronic imaging device, further has at least one mechanism out of a pan mechanism, a tilt mechanism, and a rotation mechanism, and can be operated by electrical signals or by dynamic means. 18. An imaging device that has the fisheye lens according to claim 11, is equipped with an electronic imaging device, and further has the function of recording or storing at least one of a captured image, the time, the direction, and the device's own coordinates, the function of identifying a subject, and the function of directing a target close to the center of the field of view according to an internal or external signal. 19. An imaging device that makes use of a plurality of fisheye lenses having the same specifications as the fisheye lens according to claim 11, wherein parallax can be utilized to acquire distance information about at least a specific place. 20. An imaging device that makes use of a plurality of the fisheye lenses according to claim 11, wherein a multi-lens has a convergence mechanism.
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