US4219933A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Diffraction grating ruling engine
Assignee: Hitachi Ltd
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Filing: 1979-07-10
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Granted: 1980-09-02
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Expires: 1999-07-10
Abstract
Abstract A device for the fabrication of a concave diffraction grating wherein grating grooves are mechanically ruled on a spherical surface of a diffraction grating blank and wherein a tool for ruling the grating grooves is reciprocated along the spherical surface of the diffraction grating blank, guided by a cylindrical cam, to form grooves having a uniform sectional shape over their whole area, whereby a concave diffraction grating of high diffraction efficiency and little scattering light is fabricated.
Inventors
- 👤 Toshiaki Kita
- 👤 Shigeo Moriyama
- 👤 Tatsuo Harada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:55
CPC Classifications
B; B26; B26D; B26D3/00; B26D3/08; B24; B24B; B24B13/00; B24B13/04; B24B13/046; B24B19/00; B24B19/02; G; G02; G02B; G02B5/00; G02B5/18; G02B5/1847; G02B5/1852
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
179 words
In a diffraction grating ruling engine for mechanically ruling grating grooves on a spherical surface of a diffraction grating blank, the combination comprising: tool means for ruling grating grooves on the spherical surface of the diffraction grating blank, slide means for flexibly holding said tool means, cam means having a cylindrical arc surface with a circular arc part which defines a portion of a concentric circle with respect to a circular arc part of a grating blank section parallel to said grating grooves, feed means for feeding said diffraction grating blank a predetermined amount in a widthwise direction of said grating grooves, means for reciprocating said slide means in a lengthwise direction of said grating grooves in response to said feed means and with said cylindrical cam means as a guide, and displacement means for vertically moving said cylindrical cam means a distance which is a function of a radius of curvature of said diffraction grating blank and in correspondence with a grating groove position in the widthwise direction of said grating grooves as given by said feed means.
Claim 2
Dependent Claim
179 words
In a diffraction grating ruling engine for mechanically ruling grating grooves on a spherical surface of a diffraction grating blank, the combination comprising: tool means for ruling grating grooves on the spherical surface of the diffraction grating blank, slide means for flexibly holding said tool means, cam means having a cylindrical arc surface with a circular arc part which defines a portion of a concentric circle with respect to a circular arc part of a grating blank section parallel to said grating grooves, feed means for feeding said diffraction grating blank a predetermined amount in a widthwise direction of said grating grooves, means for reciprocating said slide means in a lengthwise direction of said grating grooves in response to said feed means and with said cylindrical cam means as a guide, and displacement means for vertically moving said cylindrical cam means a distance which is a function of a radius of curvature of said diffraction grating blank and in correspondence with a grating groove position in the widthwise direction of said grating grooves as given by said feed means.
Claim 3
Dependent Claim
22 words
A diffraction grating ruling engine as defined in claim 1, wherein said displacement means comprises a numerical control employing a control tape.
Claim 4
Dependent Claim
67 words
A diffraction grating ruling engine as defined in claim 2, wherein said cylindrical arc surface has a radius of curvature which is smaller by a fixed amount than said radius of curvature of said spherical surface of said diffraction grating blank and which defines a part of said concentric circle with respect to said circular arc part of said grating blank section parallel to said grating grooves.
Claim 5
Dependent Claim
67 words
A diffraction grating ruling engine as defined in claim 2, wherein said cylindrical arc surface has a radius of curvature which is greater by a fixed amount than said radius of curvature of said spherical surface of said diffraction grating blank and which defines a psrt of said concentric circle with respect to said circular arc part of said grating blank section parallel to said grating grooves.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-02 | 1984-03-03 | 1984-09-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-02 | 1988-03-03 | 1988-09-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-02 | 1992-03-03 | 1992-09-02 | $7700.00 | Window Closed / Lapsed |