Mark indicating device for optical apparatus
AssigneeCanon Kabushiki Kaisha
InventorsSusumu Matsumura, Takashi Suzuki
Life of this patent
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Abstract
An optical apparatus includes a transparent body arranged in an optical path of the optical apparatus and incorporating a relief hologram completely embedded therein and recording information of the mark, and an illuminator arranged outside the optical path to illuminate the hologram for providing a reconstructed image of the mark, the illumination being achieved in such a direction that the light passing through the hologram does not enter the optical path.
Claims8
In an optical apparatus having objective lens means for forming an image of an object, a device for indicating a mark and view-finder means for viewing said image of object and said mark, wherein said device comprises:
- a relief hologram comprising a plurality of semi-reflective oblique faces periodically arranged to form a diffraction lattice entirely embedded in a transparent body, said hologram being arranged in an optical path of said optical apparatus;
- and
- illuminating means arranged outside said optical path to illuminate said hologram for obtaining a reconstructed image of said mark in overlapping manner with said image of object.
In an optical apparatus having objective lens means for forming an image of an object, a device for indicating a mark, and view-finder means for viewing said image of the object and said mark, wherein said device comprises:
- a first optical transparent member having a relief hologram of said mark thereon;
- a semi-reflective layer disposed on said relief hologram to define a semi-reflective relief structure;
- second optical transparent member connected to said semi-reflective layer to completely cover said semi-reflective relief structure;
- and
- illuminating means located outside said optical path to illuminate said semi-reflective relief structure so that a reconstructed image of said mark is obtained.
Dependencies are inferred from the claim text.