1.-12. (canceled)
13. An imaging lens consisting of, sequentially from an object side:
a negative first lens;
a positive second lens;
a negative third lens; and
a positive fourth lens having a convex surface on an image side, wherein
\u03b8\u226730\xb0 is satisfied and fR1\u22670.3 is satisfied, \u03b8 being an angle formed by a marginal ray of a central beam emitted from a last lens surface of the imaging lens and the normal to the lens at the position where the marginal ray is emitted; f being the focal length of the imaging lens; and R1 being the radius of curvature of a first lens surface in the imaging lens.
14. The imaging lens according to claim 13, wherein n1\u22671.51 is satisfied, n1 being the refractive index at d-line of the first lens.
15. The imaging lens according to claim 13, wherein an aspheric surface is formed on at least one surface of the second lens.
16. The imaging lens according to claim 13, wherein the second lens is configured by a biconvex lens.
17. The imaging lens according to claim 13, wherein \u03b8\u226640\xb0 is satisfied.
18. The imaging lens according to claim 13, wherein the first lens is configured by a meniscus lens disposed with the convex surface on the object side.
19. An imaging lens comprising, sequentially from an object side:
a positive first lens group;
a negative second lens group;
a positive third lens group; and
a fourth lens group configured by a meniscus lens disposed with the concave surface on the object side, wherein
BFL\u22670.3 is satisfied, \u03b8\u226715.0\xb0 is satisfied, and 0.025\u2266D3-4f\u22660.08 is satisfied, BF being the back focal length of the imaging lens; L being a distance from a first lens surface in the imaging lens to an image plane; \u03b8 being an angle formed by a marginal ray of a central beam emitted from a last lens surface of the imaging lens and the normal to the lens at the position where the marginal ray is emitted; D3-4 being an interval between the third lens group and the fourth lens group; and f being the focal length of the imaging lens.
20. The imaging apparatus according to claim 19, wherein fR1\u22670.5 is satisfied, R1 being the radius of curvature of the first lens surface in the imaging lens.
21. The imaging lens according to claim 19, wherein n3\u22671.72 is satisfied, n3 being the refractive index at d-line of the third lens group.
22. The imaging lens according to claim 19, wherein 2.0\u2267ff3\u22671.35 is satisfied, f3 being the focal length of an image-side surface of the third lens group.
23. The imaging lens according to claim 19, wherein the third lens group is configured by a biconvex lens.
24. An imaging lens comprising, sequentially from an object side:
a positive first lens group;
a negative second lens group;
a positive third lens group; and
a fourth lens group configured by a meniscus lens disposed with the concave surface on the object side, wherein
0.2\u2267D1-2f\u22670.08 is satisfied, D1-2 being an interval between the first lens group and the second lens group; and f being the focal length of the imaging lens.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A metal wood golf club head adapted for attachment to a shaft comprising:
a substantially hollow club head including a heel portion, a toe portion, a crown portion, a sole plate, a skirt portion connecting the heel portion to the toe portion, and a front face;
a center point on the sole plate defining the lowest point of the club head, the center point being directly below the club head center of gravity when the club head is at a lie of 59 degrees;
a heel secondary weight and a toe secondary weight, each secondary weight having a center of gravity positioned a predetermined distance from the center point; and
the center of gravities of the heel and toe secondary weights each being at least 0.5 inch rearward of the center point, at least 0.75 inch from the center point towards the heel for the heel secondary weight and towards the toe for the toe secondary weight, and a maximum of 0.25 inch above the center point,
wherein the position of the secondary weights causes an alteration in the traditional look of the club head wherein each bulges outwards of the natural contour of the club head.
2. The golf club head of claim 1, wherein the club head volume is between 350 cc and 460 cc.
3. The golf club head of claim 1, wherein the secondary weights are formed from tungsten or steel or nickel.
4. The golf club head of claim 1, wherein the crown portion is made from a lightweight material selected from the group consisting of carbon fiber composite, polypropylene, or magnesium.
5. A metal wood golf club head adapted for attachment to a shaft comprising:
a substantially hollow club head including a heel portion, a toe portion, a crown portion, a sole plate, a skirt portion connecting the heel portion to the toe portion, and a front face;
a center point on the sole plate defining the lowest point of the club head, the center point being directly below the club head center of gravity when the club head is at a lie of 59 degrees;
an intersection point perpendicular to the midpoint of a rear surface of the front face at a distance from the front face determined by the distance between the intersection of the hosel centerline with the sole plate of the club head;
a pair of secondary weights, a heel secondary weight and a toe secondary weight, each secondary weight having a center of gravity positioned a predetermined distance from the intersection point; and
the center of gravity of the heel weight and toe weight each being at least 1.5 inches rearward of the intersection point, each being at least 0.75 inch from the intersection point in a direction towards the heel portion for the heel secondary weight and towards the toe portion for the toe secondary weight, and each weight a maximum of 0.25 inch above the center point on the sole plate,
wherein the position of the secondary weights causes an alteration in the traditional look of the club head wherein each bulges outwards of the natural contour of the club head.
6. The golf club head of claim 5, wherein the club head volume is between 350 cc and 460 cc.
7. The golf club head of claim 5, wherein the secondary weights are formed from tungsten or nickel or steel.
8. The golf club head of claim 5, wherein the crown portion is made from a lightweight material selected from the group consisting of carbon fiber composite, polypropylene, or magnesium.
9. A metal wood golf club head adapted for attachment to a shaft comprising:
a substantially hollow club head including a heel portion, a toe portion, a crown portion, a sole plate, a skirt portion connecting the heel portion to the toe portion, and a front face;
a center point on the sole plate defining the lowest point of the club head, the center point being directly below the club head center of gravity when the club head is at a lie of 59 degrees,
a plurality of secondary weights, each secondary weight having a center of gravity positioned at least 0.9 inch from the center point; and
wherein the position of the secondary weights causes an alteration in the traditional look of the club head wherein each bulges outwards of the natural contour of the club head.
10. The golf club head of claim 9, wherein the club head volume is between 350 cc and 460 cc.
11. The golf club head of claim 9, wherein the secondary weights are formed from tungsten or steel or nickel.
12. The golf club head of claim 9, wherein the crown portion is made from a lightweight material selected from the group consisting of carbon fiber composite, polypropylene, or magnesium.