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Zoom optical system and optical equipment

An optical system and optical axis technology, applied in the field of variable magnification optical systems

Active Publication Date: 2020-07-21
NIKON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] However, in the conventional variable magnification optical system, since the lens near the image plane is used as the focus group, although the change in image magnification can be reduced, there is a problem that it tends to increase in size.

Method used

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  • Zoom optical system and optical equipment
  • Zoom optical system and optical equipment
  • Zoom optical system and optical equipment

Examples

Experimental program
Comparison scheme
Effect test

no. 1 Embodiment

[0940] use Figure 1 ~ Figure 4 And Table 1 describes the first embodiment. Such as figure 1 As shown, the variable power optical system ZLI (ZL1) of the first embodiment consists of the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, and the second lens group G2 with The third lens group G3 having positive refractive power, the fourth lens group G4 having positive refractive power, and the fifth lens group G5 having negative refractive power are constituted.

[0941] In this embodiment, the second lens group G2 and the third lens group G3 correspond to the front side lens group GX. The fourth lens group G4 corresponds to the middle lens group GM (focus lens group GF). The fifth lens group G5 corresponds to the rear lens group GR. In addition, the cemented lens composed of the lenses L51 and L52 constituting the fifth lens group G5 corresponds to the anti-vibration lens group VR.

[0942] The first lens group G1...

no. 2 Embodiment

[1040] use Figure 5 ~ Figure 8 And Table 2 describes the second embodiment. Such as Figure 5 As shown, the variable power optical system ZLI (ZL2) of the second embodiment consists of the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, and the second lens group G2 with The third lens group G3 with positive refractive power, the fourth lens group G4 with positive refractive power, the fifth lens group G5 with negative refractive power, and the sixth lens group G6 with positive refractive power constitute.

[1041]In this embodiment, the second lens group G2 and the third lens group G3 correspond to the front side lens group GX. The fourth lens group G4 corresponds to the middle lens group GM (focus lens group GF). The fifth lens group G5 and the sixth lens group G6 correspond to the rear lens group GR. In addition, the cemented lens composed of the lenses L51 and L52 constituting the fifth lens group G5 corresp...

no. 3 Embodiment

[1153] use Figure 9 ~ Figure 12 And Table 3 describes the third embodiment. Such as Figure 9 As shown, the variable power optical system ZLI (ZL3) of the third embodiment consists of the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, and the second lens group G2 with The third lens group G3 with positive refractive power, the fourth lens group G4 with positive refractive power, the fifth lens group G5 with negative refractive power, and the sixth lens group G6 with positive refractive power constitute.

[1154] In this embodiment, the second lens group G2 and the third lens group G3 correspond to the front side lens group GX. The fourth lens group G4 corresponds to the middle lens group GM (focus lens group GF). The fifth lens group G5 and the sixth lens group G6 correspond to the rear lens group GR. In addition, the cemented lens composed of the lenses L51 and L52 constituting the fifth lens group G5 corresp...

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Abstract

The present invention has a first lens group (G1) with positive refractive power, a front lens group (GX), a middle lens group (GM) with positive refractive power, and a rear lens group arranged in order from the object side (GR), the front lens group (GX) consists of more than one lens group and has a negative lens group, at least a part of the middle lens group (GM) is the focusing lens group (GF), and the rear lens group (GR) consists of a With the above lens group configuration, when zooming, the first lens group (G1) moves relative to the image plane, the distance between the first lens group (G1) and the front lens group (GX) changes, and the front lens group The interval between (GX) and the middle lens group (GM) changes, and the interval between the middle lens group (GM) and the rear lens group (GR) changes.

Description

technical field [0001] The invention relates to a variable power optical system, an optical device and a manufacturing method of the variable power optical system. Background technique [0002] Conventionally, variable power optical systems suitable for photographic cameras, electronic still cameras, video cameras, and the like have been proposed (for example, refer to Patent Document 1). [0003] However, the conventional variable power optical system tends to increase in size due to the large number of lenses constituting the focus group, and also has the problem of a large change in image magnification during focusing. [0004] Conventionally, a variable magnification optical system has been proposed that suppresses changes in image magnification during focusing and includes a hand-shake correction mechanism (for example, refer to Patent Document 2). [0005] However, in the conventional variable power optical system, since the lens near the image plane is used as the fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/20
CPCG02B15/173G02B27/646G02B15/145113G02B15/1461G02B15/145129
Inventor 柴田悟幸岛知之
Owner NIKON CORP