Patent US5674781A successfully refreshed from Google Patents.
US4749271A
Expired / Lapsed
US
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Finder scope for use with astronomical telescopes
Assignee: Individual
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Filing: 1986-11-10
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Granted: 1988-06-07
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Expires: 2006-11-10
Abstract
Abstract A finder or sighting scope for use with an astronomical telescope, the finder scope having a target member or reticle located at the common focus of the scope objective and the eyepiece. The target member or reticle may be seen as a magnified telescope view when viewed through the eyepiece and as a target or star image against the backdrop of the sky as viewed by a naked eye, the target or star image being projected into the viewer's line of sight by the objective and a mirror and beamsplitter.
Inventors
- 👤 Albert Nagler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 02:04
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/16; G02B23/02; G02B23/10; G02B27/00; G02B27/32
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
138 words
A finder scope for use with astronomical telescopes comprising, a low power telescope having a relatively large field of view, illuminated target means located in the common focal plane of the telescope objective and the eyepiece, mirror means located in front of the telescope objective so as to reflect a collimated image of said target means at an angle to the optical axis of said telescope, beamsplitter means spaced from said mirror means for reflecting the collimated image of said target means along an axis parallel to but spaced from the optical axis of said telescope, whereby an observer viewing a star field along the parallel axis with a naked eye and through the telescope with the other eye sees an image of said target means as though it were a star in the star field being observed.
Claim 2
Dependent Claim
138 words
A finder scope for use with astronomical telescopes comprising, a low power telescope having a relatively large field of view, illuminated target means located in the common focal plane of the telescope objective and the eyepiece, mirror means located in front of the telescope objective so as to reflect a collimated image of said target means at an angle to the optical axis of said telescope, beamsplitter means spaced from said mirror means for reflecting the collimated image of said target means along an axis parallel to but spaced from the optical axis of said telescope, whereby an observer viewing a star field along the parallel axis with a naked eye and through the telescope with the other eye sees an image of said target means as though it were a star in the star field being observed.
Claim 3
Dependent Claim
34 words
A finder scope according to claim 1 including mounting means for supporting said mirror means and said beamsplitter means on said telescope, said mounting means being rotatable around the optical axis of said telescope.
Claim 4
Dependent Claim
35 words
A finder scope according to claim 1 wherein said target means comprises a reflecting element located in the common focal plane of the telescope objective and the eyepiece, and means for illuminating said reflecting element.
Claim 5
Dependent Claim
19 words
A finder scope according to claim 3 wherein said illuminating means includes means for varying the level of illumination.
Claim 6
Dependent Claim
38 words
A finder scope according to claim 1 wherein said illuminated target means comprises a reticle having an inner pattern that is seen magnified by the eyepiece and a larger outer pattern that is seen through the telescope objective.
Claim 7
Dependent Claim
42 words
A finder scope according to claim 5 wherein the telescope objective has a focal length n times the focal length of the eyepiece and wherein the larger outer pattern is n times the size of the inner pattern in diameter and thickness.
Claim 8
Dependent Claim
31 words
A finder scope according to claim 5 including a field stop baffle located between the eyepiece and said reticle so that said larger outer pattern is not seen through said eyepiece.
Claim 9
Dependent Claim
31 words
A finder scope according to claim 6 including a field stop baffle located between the eyepiece and said reticle so that said larger outer pattern is not seen through said eyepiece.
Claim 10
Dependent Claim
33 words
A finder scope according to claim 5 wherein said illuminated target means comprises a first light source for illuminating said inner pattern and a second light source for illuminating said larger outer pattern.
Claim 11
Dependent Claim
33 words
A finder scope according to claim 6 wherein said illuminated target means comprises a first light source for illuminating said inner pattern and a second light source for illuminating said larger outer pattern.
Claim 12
Dependent Claim
31 words
A finder scope according to claim 9 wherein at least one of said light sources is rheostat controlled so that said inner pattern is illuminated differently than said larger outer pattern.
Claim 13
Dependent Claim
31 words
A finder scope according to claim 10 wherein at least one of said light sources is rheostat controlled so that said inner pattern is illuminated differently than said larger outer pattern.
Claim 14
Dependent Claim
19 words
A finder scope according to claim 9 wherein said light sources illuminate their respective patterns with different color light.
Claim 15
Dependent Claim
19 words
A finder scope according to claim 10 wherein said light sources illuminate their respective patterns with different color light.
Claim 16
Dependent Claim
141 words
A finder scope for use with astronomical telescopes comprising, a low power telescope having a relatively large field of view, illuminated target means located in the common focal plane of the telescope objective and the eyepiece, full aperture beamsplitter means located in front of the telescope objective so as to reflect a collimated image of said target means at an angle to the optical axis of said telescope, second beamsplitter means spaced from said beamsplitter means for reflecting the collimated image of said target means along an axis parallel to but spaced from the optical axis of said telescope, whereby an observer viewing a star field along the parallel axis with the naked eye and through the telescope with the other eye sees an image of said target means as though it were a star in the star field being observed.
Claim 17
Dependent Claim
141 words
A finder scope for use with astronomical telescopes comprising, a low power telescope having a relatively large field of view, illuminated target means located in the common focal plane of the telescope objective and the eyepiece, full aperture beamsplitter means located in front of the telescope objective so as to reflect a collimated image of said target means at an angle to the optical axis of said telescope, second beamsplitter means spaced from said beamsplitter means for reflecting the collimated image of said target means along an axis parallel to but spaced from the optical axis of said telescope, whereby an observer viewing a star field along the parallel axis with the naked eye and through the telescope with the other eye sees an image of said target means as though it were a star in the star field being observed.
Claim 18
Dependent Claim
35 words
A finder scope according to claim 15 including mounting means for supporting said beamsplitter means and said second beamsplitter means on said telescope, said mounting means being rotatable around the optical axis of said telescope.
Claim 19
Dependent Claim
35 words
A finder scope according to claim 15 wherein said target means comprises a reflecting element located in the common focal plane of the telescope objective and the eyepiece, and means for illuminating said reflecting element.
Claim 20
Dependent Claim
19 words
A finder scope according to claim 17 wherein said illuminting means includes means for varying the level of illumination.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-07 | 1991-12-07 | 1992-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-07 | 1995-12-07 | 1996-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-07 | 1999-12-07 | 2000-06-07 | $7700.00 | Window Closed / Lapsed |