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Optical system

An optical system and optical surface technology, applied in the field of optical systems, can solve the problems of weakened anti-reflection film, increased reflected light, and higher risk of ghosting and halos, and achieves the effect of suppressing ghosting and halos, and suppressing Produces, low reflectivity effect

Inactive Publication Date: 2005-10-05
NIKON CORP
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Problems solved by technology

[0004] However, in the anti-reflection film formed according to the conventional method, the incident angle of the light incident on the optical surface on which the anti-reflection film is formed increases, and if it is incident from an oblique direction, the characteristics of the anti-reflection film change, which acts as an anti-reflection film. The effect of the reflective film is rapidly weakened, and problems such as increased reflected light will arise
If such a reflective surface has only one side in the optical system, since the reflected light returns to the object side, it will not directly affect the optical performance of the optical system, but if there are multiple surfaces, the reflected light will reach the image side, resulting in Increased risk of ghosting and haloing

Method used

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no. 1 example

[0033] Next, referring to FIG. 3 , as a first embodiment, an imaging optical system 10 will be described as an optical system having an optical element on which the above-mentioned antireflection film 1 is formed. This imaging optical system 10 is used as a zoom lens for a video camera whose focal length continuously changes from 18mm to 35mm, and consists of a parallel plane plate F serving as a protective glass, a negative meniscus lens L1 with a convex surface facing the object side, and a convex surface facing the object side. A combination lens in which the negative meniscus lens L2 on the object side and the negative meniscus lens L3 with the convex surface facing the Combination lens with convex lens L7 attached together, aperture stop P, combination lens with biconvex lens L8 and biconcave lens L9 bonded together, combination lens with negative meniscus lens L10 and biconvex lens L11 with the convex surface facing the object side bonded together , and a biconvex lens L...

no. 2 example

[0071] Figure 4 An imaging optical system 20 as a second embodiment of the present invention is shown. The imaging optical system 20 is a camera lens with a focal length of 14 mm, and consists of a negative meniscus lens L1 with a convex surface facing the object side, a positive meniscus lens L2 with a convex surface facing the object side, and a negative meniscus lens L2 with a convex surface facing the object side. Lunar lens L3, a combination lens in which a negative meniscus lens L4 with a convex surface facing the object side and a negative meniscus lens L5 with a convex surface facing the object side are bonded together, a negative meniscus lens L6 with a convex surface facing the object side, biconvex lens L7, the combination lens of the negative meniscus lens L8 with the convex surface facing the object side and the biconvex lens L9 pasted together, the biconcave lens L10, the aperture diaphragm P, and the biconvex lens L11 and the meniscus lens L12 with the concave ...

no. 3 example

[0117] Second, referring to Figure 5 and Figure 6 , as a third embodiment, an imaging optical system 30 will be described as an optical system having an optical element on which the above-mentioned antireflection film 1 is formed. This imaging optical system 30 is used as a lens for a camera with a focal length of 293.798 mm, and consists of a parallel plane plate F1 serving as a cover glass, a biconvex lens L1, a joint lens in which a biconvex lens L2 and a biconcave lens L3 are pasted together, in order from the object side, A combination lens in which a negative meniscus lens L4 with a convex surface facing the object side and a biconvex lens L5 are bonded together, a biconcave lens L6, a combination lens in which a positive meniscus lens L7 with a concave surface facing the object side and a biconcave lens L8 are bonded together, Aperture diaphragm P, biconvex lens L9, negative meniscus lens L10 with concave surface facing the object side, positive meniscus lens L11 with ...

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Abstract

In an imaging optical system 10, which comprises a plurality of optical members F and L1 to L12 and an aperture diaphragm P, the anti-reflection coating 1 is formed on the concave surfaces 2 and 3 of light-transmitting members (for example, negative meniscus lenses L1 and L2) that turn concavities to the aperture diaphragm P out of the optical members. The anti-reflection coating 1 is constituted to include at least one layer or more formed by using a sol-gel method.

Description

technical field [0001] The present invention relates to an optical system having an antireflection film formed on optical elements used in photography, binoculars, telescopes, microscopes, etc., and used in multiple wavelengths or frequency bands. Background technique [0002] The purpose of the anti-reflection coating is to reduce the reflection caused by the difference in refractive index between the optical elements and the medium that make up the optical system. If such reflected light hits the image surface, ghosting and halos will occur, which will have a significant adverse effect on optical performance. In recent years, the optical performance required for an optical system has improved, and the antireflection film formed on the optical element disposed in the optical system has also been required to have better low reflection performance in a wider range of incident angles than before. [0003] In order to meet such demands, multilayer film design technology or mul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C17/34
CPCG02B1/115C03C17/3452C03C2218/113C03C2218/151
Inventor 田中一政
Owner NIKON CORP
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