Importance

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Abstract

A system which enables to observe an image without any trouble by suppressing an occurrence of the Moire interference fringes, when implementing an enlarging observation of an image using a thin lens with respect to an image display screen having a plurality of pixels arranged two-dimensionally with a periodicity, such as the CRT display or the liquid crystal display is provided. The system for enlargedly observing an image on an image screen having a plurality of pixels arranged two-dimensionally with a periodicity, said system includes a thin transparent lens means configured to enlargedly and transparently observe an image, and arranged with a plurality of image enlarging optical elements in two-dimensions having a periodicity by a predetermined pitch. The lens means has an overall magnifying power in the range of 1.01.about.1.20, and is placed on an observer side apart from the image screen with a predetermined gap. The predetermined gap between the lens means and the image screen is in the range of 2 mm.about.40 mm, and the pitch of the plurality of image enlarging optical elements formed in the lens means is in the range of 0.023 mm.about.0.25 mm. The predetermined gap between the lens means and the image screen is defined in association with the pitch of the optical elements of the lens means such that an intensity of Moire interference fringes caused by a periodicity of an arrangement of the pixels in the image screen and a periodicity of an arrangement of the optical elements of the lens means must not exceed 0.15 in an absolute value.

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First Claim