US4374612A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mark indicating device for optical apparatus
Assignee: Canon Inc
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Filing: 1981-07-13
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Granted: 1983-02-22
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Expires: 2001-07-13
Abstract
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.
Inventors
- 👤 Susumu Matsumura
- 👤 Takashi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:33
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/32; G02B27/00; G02B27/32; G02B27/34
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
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.
Claim 2
Dependent Claim
100 words
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.
Claim 3
Dependent Claim
105 words
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.
Claim 4
Dependent Claim
105 words
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.
Claim 5
Dependent Claim
26 words
A device according to the claim 2, wherein said illuminating means is positioned opposite to said view-finder means with respect to the face having said hologram.
Claim 6
Dependent Claim
64 words
A device according to the claim 3, wherein said face having said hologram is provided with a relief diffraction lattice structure composed of periodically repeating triangle-sectioned unit structures each formed by two oblique faces, whereby diffracted light formed by one of said oblique faces having larger oblique angle to said face having said hologram is introduced into the optical path of said view-finder means.
Claim 7
Dependent Claim
25 words
A device according to the claim 2, wherein said first optical transparent member and said second optical transparent member have substantially the same refractive indexes.
Claim 8
Dependent Claim
22 words
A device according to claim 5, wherein said reconstructed image is the nth-order diffraction image, n being a integer greater than 1.
Claim 9
Dependent Claim
16 words
The device according to the claim 5, wherein said relief hologram is focused image relief hologram.
Claim 10
Dependent Claim
22 words
A device according to the claim 5, wherein said mark is reconstructed in an overlapping manner with said image of the object.
References Cited (Backward Citations)
US3560921A
Cited
US3633988A
Cited
US4165930A
Cited
US4200380A
Cited
US4255032A
Cited
US4294529A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-21 | 1986-08-23 | 1987-02-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-21 | 1990-08-23 | 1991-02-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-21 | 1994-08-23 | 1995-02-22 | $7700.00 | Window Closed / Lapsed |