Variable power optical system, optical device and manufacturing method of variable power optical system
An optical system and optical power technology, applied in the field of variable magnification optical systems
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[0070] Hereinafter, various embodiments of the present application will be described with reference to the drawings. figure 1 , Figure 5 , Figure 9 as well as Figure 13 It is a cross-sectional view showing the structure and power distribution of the variable power optical system ZL ( ZL1 to ZL4 ) of each embodiment. In the lower part of the cross-sectional views of these variable power optical systems ZL1 to ZL4, the arrows show the respective lens groups G1 to G4 when zooming from the wide-angle end state (W) to the telephoto end state (T) via the intermediate focal length state (M) (or G5) The direction of movement along the optical axis.
[0071]In each embodiment, let the height in the direction perpendicular to the optical axis be y, and let the distance (concave amount) along the optical axis from the tangent plane at the apex of each aspheric surface to each aspheric surface at the height y be S (y), where r is the radius of curvature (paraxial radius of curvatur...
no. 1 Embodiment
[0076] figure 1 It is a figure which shows the structure of the variable power optical system ZL1 of 1st Example. The variable power optical system ZL1 consists of the first lens group G1 with negative refractive power, the second lens group G2 with positive refractive power, the third lens group G3 with positive refractive power, and the third lens group G3 with positive refractive power in order from the object side. The 4th lens group G4 which is the following lens group GL which has negative refractive power, and the 5th lens group G5 which has positive refractive power are comprised.
[0077] In this variable power optical system ZL1, the first lens group G1 includes a negative meniscus lens L11 with a convex surface toward the object side, a negative meniscus lens L12 with an aspherical lens surface on the image side, and a negative meniscus lens L12 with an aspherical lens surface. A resin layer is provided on the lens surface on the image side to form an aspheric meni...
no. 2 Embodiment
[0109] Figure 5 It is a figure which shows the structure of the variable power optical system ZL2 of 2nd Example. The variable power optical system ZL2 consists of the first lens group G1 with negative refractive power, the second lens group G2 with positive refractive power, and the subsequent lens group GL with negative refractive power in order from the object side. The third lens group G3 and the fourth lens group G4 having positive refractive power constitute.
[0110] In this variable power optical system ZL2, the first lens group G1 is formed sequentially from the object side by a negative meniscus lens L11 with a convex surface facing the object side, and an aspherical meniscus lens surface with a convex surface facing the object side. The negative lens L12 on the image side, the meniscus-shaped negative lens L13 whose image-side lens surface is aspherical and whose convex surface faces the object side, the double-concave negative lens L14, and the double-convex posi...
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