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Wide-angle optical system and imaging device using same

A wide-angle optical system and optical surface technology, applied in the field of wide-angle optical system and camera device, can solve the problems of difficult optical system movement, actuator size and output limitation, etc.

Active Publication Date: 2021-04-09
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the field of view is 140° or more, and there are limitations in the size and output of the actuator
Therefore, in focus position adjustment, it is difficult to move the optical system

Method used

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  • Wide-angle optical system and imaging device using same
  • Wide-angle optical system and imaging device using same
  • Wide-angle optical system and imaging device using same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0371] The wide-angle optical system of Example 1 includes a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power in order from the object side.

[0372] The first lens group G1 includes a plano-concave negative lens L1, a double-concave negative lens L2, and a positive meniscus lens L3 with a convex surface facing the object side. The biconcave negative lens L2 is cemented with the positive meniscus lens L3.

[0373] The second lens group G2 has a positive meniscus lens L4 whose convex surface faces the object side.

[0374] The third lens group G3 has a negative meniscus lens L5 with a convex surface facing the object side, a biconvex positive lens L6, a negative meniscus lens L7 with a convex surface facing the object side, a biconvex positive lens L8, a biconcave negative lens L9, and a biconvex positive lens. L10, a biconvex positive lens L11, and a negati...

Embodiment 2

[0378] The wide-angle optical system of Example 2 includes a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power in order from the object side.

[0379] The first lens group G1 has a plano-concave negative lens L1, a bi-concave negative lens L2, and a bi-convex positive lens L3. The biconcave negative lens L2 is cemented with the biconvex positive lens L3.

[0380] The second lens group G2 has a positive meniscus lens L4 whose convex surface faces the object side.

[0381] The third lens group G3 has a biconvex positive lens L5, a biconcave negative lens L6, a biconvex positive lens L7, a positive meniscus lens L8 with a convex surface facing the image side, a negative meniscus lens L9 with a convex surface facing the image side, and a biconvex positive lens. Lens L10.

[0382] The biconcave negative lens L6 is bonded to the biconvex positive lens L7. The po...

Embodiment 3

[0385] The wide-angle optical system of Example 3 includes a first lens group G1 having negative refractive power, a second lens group G2 having positive refractive power, and a third lens group G3 having positive refractive power in order from the object side.

[0386] The first lens group G1 has a plano-concave negative lens L1.

[0387] The second lens group G2 has a positive meniscus lens L2 whose convex surface faces the image side.

[0388] The third lens group G3 has a biconvex positive lens L3, a biconcave negative lens L4, a biconvex positive lens L5, a positive meniscus lens L6 with a convex surface facing the image side, a negative meniscus lens L7 with a convex surface facing the image side, and a biconvex positive lens. Lens L8.

[0389] The biconcave negative lens L4 is bonded to the biconvex positive lens L5. The positive meniscus lens L6 is bonded to the negative meniscus lens L7.

[0390] A filter F is arranged between the first lens group G1 and the second...

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Abstract

Provided are: a wide-angle optical system in which various aberrations are well corrected, and the outer diameters of movable lenses and the outer diameters of lenses positioned adjacent to a movable lens group are sufficiently small, and which has an appropriate back focus; and an imaging device using said optical system. The wide-angle optical system is provided with, in order from an object side: a first lens group G1 having negative refractive power; a second lens group G2 having positive refractive power; and a third lens group G3 having positive refractive power. The second lens group G2 moves from a first position toward a second position when the focal position is adjusted from a far point to a near point. The third lens group G3 has refractive surfaces more than nine surfaces, has a positive single lens on the image side of a bonding surface Sc positioned on the closest image side of the third lens group and having negative refractive power, and has a plurality of negative refractive surfaces on the object side of the bonding surface Sc. The third lens group G3 has, on the object side from two surfaces, positioned on the image side, among the plurality of negative refractive surfaces, at least one positive refractive surface Sp that satisfies the following conditional expression (1): 0.02<fL / Rsp<1.20(1).

Description

technical field [0001] The present invention relates to a wide-angle optical system and an imaging device including the wide-angle optical system. Background technique [0002] As an optical system having a wide angle of view, an objective optical system for an endoscope is known. Such a wide-angle optical system having an angle of view exceeding 100 degrees is used in an objective optical system for an endoscope. [0003] In conventional endoscopes, an imaging element with a small number of pixels is used. Therefore, a fixed-focus optical system is used in the objective optical system for an endoscope. Even if a fixed-focus optical system is used, the depth of field can cover the range of subject distances to be observed (observation depth). [0004] However, in recent years, imaging elements with a large number of pixels have been used in order to improve the quality of observed images, and high resolution is also required for optical systems in endoscopes using imaging...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/04
CPCG02B13/04G02B23/243A61B1/00096A61B1/00174A61B1/00163G02B15/143507A61B1/00183
Inventor 藤仓崇市川启介三原伸一
Owner OLYMPUS CORP
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