The present invention provides a high-performance, thin wide-angle lens suitable for imaging elements with high pixel counts. The wide-angle lens includes, from an object side to an image plane side: a first lens group including a first lens having a negative refractive power and a second lens havin
The present invention provides a high-performance, thin wide-angle lens suitable for imaging elements with high pixel counts. The wide-angle lens includes, from an object side to an image plane side: a first lens group including a first lens having a negative refractive power and a second lens having a positive refractive power; and a second lens group including a third lens having a negative refractive power, a fourth lens having a positive refractive power, and a fifth lens having a positive refractive power. The fourth lens is bonded to the third lens. The fifth lens is formed with at least one of its convex surfaces being an aspherical surface.
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1. A wide-angle lens comprising, from an object side to an image plane side: a first lens group comprising: a first lens having a negative refractive power, anda second lens having a positive refractive power; and a second lens group comprising: a third lens having a negative refractive power,a
1. A wide-angle lens comprising, from an object side to an image plane side: a first lens group comprising: a first lens having a negative refractive power, anda second lens having a positive refractive power; and a second lens group comprising: a third lens having a negative refractive power,a fourth lens having a positive refractive power, said fourth lens being bonded to said third lens, anda fifth lens having a positive refractive power, said fifth lens comprising a first convex surface oriented to said object side and a second convex surface oriented to said image plane side, at least one of said convex surfaces being an aspherical surface;wherein: (1) 0.7|R6|v2, v350 (3) |f1|>2 f2 (4) 2.5 f22>f21>f22, where R6 is a curvature radius of an object-side surface of said third lens; R8 is a curvature radius of an image plane-side surface of said fourth lens; vi is an Abbe number of an i-th lens (i=1-5); f1 is a composite focal length of said first lens group; f2 is a composite focal length of said second lens group; f21 is a composite focal length of said third and said fourth lenses in said second lens group; f22 is a focal length of said fifth lens in said second lens group. 2. A wide-angle lens comprising, from an object side to an image plane side: a first lens group comprising: a first lens having a negative refractive power, anda second lens having a positive refractive power; and a second lens group comprising: a third lens having a negative refractive power,a fourth lens having a positive refractive power, said fourth lens being bonded to said third lens, anda fifth lens having a positive refractive power, said fifth lens comprising a first convex surface oriented to said object side and a second convex surface oriented to said image plane side, both of said convex surfaces being aspherical surfaces;wherein: (1) 0.7|R6|v2, v350 (3) f1>4 f2 (4) 2.5 f22>f21>f22, where R6 is a curvature radius of an object-side surface of said third lens; R8 is a curvature radius of an image plane-side surface of said fourth lens; vi is an Abbe number of an i-th lens (i=1-5); f1 is a composite focal length of said first lens group; f2 is a composite focal length of said second lens group; f21 is a composite focal length of said third and said fourth lenses in said second lens group; f22 is a focal length of said fifth lens in said second lens group. 3. The wide-angle lens as described in claim 1, further comprising: a glass filter oriented to said image plane side of said fifth lens. 4. The wide-angle lens as described in claim 3; wherein: (1) v6>v5 where v6 is an Abbe number of said glass filter. 5. The wide-angle lens as described in claim 3, wherein said glass filter is selected from the group comprising an infrared cut filter and a low-pass filter.6. The wide-angle lens as described in claim 1, further comprising: an aperture stop disposed between said second lens and said third lens. 7. The wide-angle lens as described in claim 1, further comprising: a total lens length of less than or equal to 12 mm. 8. The wide-angle lens as described in claim 1, further comprising: a back focus of greater than or equal to 5 mm. 9. The wide-angle lens as described in claim 1, further comprising: an exit pupil position of greater than or equal to |20 mm |. 10. The wide-angle lens as described in claim 7, wherein said total lens length is about 11.10 mm to about 11.90 mm.11. The wide-angle lens as described in claim 2, further comprising: a glass filter oriented to said image plane side of said fifth lens. 12. The wide-angle lens as described in claim 11; wherein: (1) v6>v5 where v6 is an Abbe number of said glass filter. 13. The wide-angle lens as described in claim 11, wherein said glass filter is selected from the group comprising an infrared cut filter and a low-pass filter.14. The wide-angle lens as described in claim 2, further comprising: an aperture stop disposed between said second lens and said third lens. 15. The wide-angle lens as described in claim 2, further comprising: a total lens length of less than or equal to 10 mm. 16. The wide-angle lens as described in claim 2, further comprising: a back focus of greater than or equal to 7 mm. 17. The wide-angle lens as described in claim 2, further comprising: an exit pupil position of greater than or equal to |20 mm |. 18. The wide-angle lens as described in claim 15, wherein said total lens length is about 9.90 mm to about 9.95 mm.19. A method of producing a wide-angle lens, comprising the following steps: providing a first lens having a negative refractive power; providing a second lens having a positive refractive power; providing a third lens having a negative refractive power; providing an aperture stop between said second lens and said third lens; providing a fourth lens having a positive refractive power; bonding said third lens to said fourth lens; providing a fifth lens having a positive refractive power and at least one aspherical convex surface; providing a glass filter on an image plane side of said fifth lens; providing 0.7|R6|v2, v350; providing |f1|>2 f2; providing 2.5 f22>f21>f22; and providing v6>v5; where R6 is a curvature radius of an object-side surface of said third lens; R8 is a curvature radius of an image plane-side surface of said fourth lens; vi is an Abbe number of an i-th lens (i=1-5); v6 is an Abbe number of said glass filter; f1 is a composite focal length of said first lens group; f2 is a composite focal length of said second lens group; f21 is a composite focal length of said third and said fourth lenses in said second lens group; f22 is a focal length of said fifth lens in said second lens group.
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