US3726596A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical device for forming measuring and reference beams of light
Assignee: Individual
•
Filing: 1971-08-05
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Granted: 1973-04-10
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Expires: 1991-08-05
Abstract
Abstract A beam from a light source is collimated and directed at right angles into the input face of a Koster''s prism. From the output face of the prism emerge a measuring and reference beams which are parallel to each other. Lenses across the latter beams focussing the respective beams in the plane of a chopper disc. Diaphragms are positioned between the lenses and the disc.
Inventors
- 👤 A Triller
- 👤 W Siersch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 23:26
CPC Classifications
G; G02; G02B; G02B27/00; G02B27/10; G02B27/106; G01; G01J; G01J1/00; G01J1/10; G01J1/16; G01J1/1626; G01J1/20; G01J1/34; G01J1/36; G02B27/14; G02B27/144
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
In a double beam instrument responding to the ratio of intensities of a measuring light beam as compared to a reference light beam, said instrument having an optical apparatus for forming the measuring and reference beams, comprising an interchangeably mounted light source for producing a primary beam of light and means for dividing said primary beam into said measuring and reference beams, the improvement comprising: said means being a Koster''s prism having an input face positioned to receive said primary beam and an output face at which said measuring and reference beams emerge in parallel alignment to each other; and two identical optical devices positioned respectively across said reference and measuring beams at equal distances from said output face and thus at equal optical path lengths from said light source.
Claim 2
Dependent Claim
130 words
In a double beam instrument responding to the ratio of intensities of a measuring light beam as compared to a reference light beam, said instrument having an optical apparatus for forming the measuring and reference beams, comprising an interchangeably mounted light source for producing a primary beam of light and means for dividing said primary beam into said measuring and reference beams, the improvement comprising: said means being a Koster''s prism having an input face positioned to receive said primary beam and an output face at which said measuring and reference beams emerge in parallel alignment to each other; and two identical optical devices positioned respectively across said reference and measuring beams at equal distances from said output face and thus at equal optical path lengths from said light source.
Claim 3
Dependent Claim
49 words
In an instrument as set forth in claim 1, including a converging optical element means positioned across said primary beam between said light source and said input face for collimating the primary beam entering said input face and directing the collimated beam at right angles to said input face.
Claim 4
Dependent Claim
73 words
In an instrument as set forth in claim 2, including a chopper disc positioned in a plane and rotating about an axis, said optical devices each comprising an optical element focussing the respective beam substantially in said plane and at different radial distances from said axis, said disc having two circular arrays of apertures positioned respectively at said different radial distances from said axis, the apertures of each array being identical in diameter.
Claim 5
Dependent Claim
32 words
In an instrument as set forth in claim 3, wherein said optical devices each include a diaphragm across the measuring and reference beams respectively for reducing the peripheral size of the beam.
Claim 6
Dependent Claim
73 words
In an instrument as set forth in claim 1, including a chopper disc positioned in a plane and rotating about an axis, said optical devices each comprising an optical element focussing the respectiVe beam substantially in said plane and at different radial distances from said axis, said disc having two circular arrays of apertures positioned respectively at said different radial distances from said axis, the apertures of each array being identical in diameter.
Claim 7
Dependent Claim
32 words
In an instrument as set forth in claim 5, wherein said optical devices each include a diaphragm across the measuring and reference beams respectively for reducing the peripheral size of the beam.
References Cited (Backward Citations)
US3617756A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-09 | 1976-10-09 | 1977-04-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-09 | 1980-10-09 | 1981-04-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-09 | 1984-10-09 | 1985-04-10 | $7700.00 | Window Closed / Lapsed |