US4283115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Beam splitters for endoscopes comprising a dual observation system
Assignee: Richard Wolf GmbH
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Filing: 1979-07-05
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Granted: 1981-08-11
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Expires: 1999-07-05
Abstract
Abstract This invention relates to beam splitters for use with endoscopes of the kind comprising a dual observation system whereby the image may optionally be adjusted for different proportions of the light intensity for the observer and the joint observer or a film or television camera by means of the optical system of the endoscope. According to the invention the beam splitter comprises two thin glass plates having a partial specular finish or partial reflection, at least one of said plates being shiftable to bring the partial specular finish in confrontation to an angled position in the beam path of the endoscope.
Inventors
- 👤 Klaus Fraissl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:13
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/14; G02B27/144; A; A61; A61B; A61B1/00; A61B1/00064; A61B1/00066; A61B1/00163; A61B1/04; A61B1/042; G02B23/00; G02B23/24; G02B23/2407; G02B23/2423; G02B26/00; G02B26/02; G02B27/145; A61B1/00195
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
88 words
In an endoscope of the kind comprising a dual observation system whereby the image may optionally be adjusted for different proportions of the light intensity for the observer and the joint observer or a film or television camera by means of the optical system of the endoscope, a beam splitter comprising two thin glass plates each having a partial reflective coating, at least one of said plates being shiftable to bring its partial reflective coating in confrontation to an angled position in the beam path of the endoscope.
Claim 2
Dependent Claim
88 words
In an endoscope of the kind comprising a dual observation system whereby the image may optionally be adjusted for different proportions of the light intensity for the observer and the joint observer or a film or television camera by means of the optical system of the endoscope, a beam splitter comprising two thin glass plates each having a partial reflective coating, at least one of said plates being shiftable to bring its partial reflective coating in confrontation to an angled position in the beam path of the endoscope.
Claim 3
Dependent Claim
42 words
A beam splitter according to claim 1, wherein said two small glass plates are locatable in mutual congruence with their partial mirror coatings facing towards each other, by displacing one of said glass plates with respect to the other said glass plate.
Claim 4
Dependent Claim
51 words
A beam splitter according to claim 1, wherein said two small glass plates are combined in one plane into a combined glass plate which over a partial surface is provided with a less dense partial reflecting coating and over the other partial surface is provided with a denser partial reflecting coating.
Claim 5
Dependent Claim
38 words
A beam splitter according to claim 1, wherein one of said small glass plates is provided with a partial reflecting coating and is congruent to an areal portion only of the second one of said small glass plates.
Claim 6
Dependent Claim
36 words
A beam splitter according to claim 1, wherein one of said small thin glass plates is coated with a partial reflective coating progressively denser in substantially continuous manner from one side towards the oppositely situated side.
References Cited (Backward Citations)
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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) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |