Patent US4981337A successfully refreshed from Google Patents.
US4981337A
Expired / Lapsed
US
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Fibre-type light wavelength coversion device
Assignee: Pioneer Corp
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Filing: 1989-05-22
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Granted: 1991-01-01
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Expires: 2009-05-22
Abstract
Abstract A fibre-type light wavelength conversion device for converting the wavelength of an incident light beam and issuing the incident light beam as a light beam having a predetermined wavelength, having a core and a cladding layer around the core. The device is characterized by the provision of a transparent cylindrical layer provided around the cladding layer, having a refractive index substantially equal to the refractive index of the cladding layer and having a predetermined wall thickness. According to a feature of the invention the wall thickness is determined so that the condition d>l tan θ is satisfied, where d represents a diameter of said cylindrical layer, l represents an operating length of the device, and θ represents Cerenkov angle.
Inventors
- 👤 Sota Okamoto
- 👤 Kiyofumi Chikuma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 17:08
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/02; G02B6/036; G02B6/03694; G02B6/03616; G02B6/03622; G02F; G02F1/00; G02F1/35; G02F1/37; G02F1/377; G02F1/383
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
72 words
A fibre-type light wavelength conversion device for converting the wavelength of an incident light beam and issuing the incident light beam as a light beam having a predetermined wavelength, comprising: a core; a cladding layer provided around said core; and a transparent layer provided around said cladding layer, said transparent layer having a refractive index substantially equal to a refractive index of said cladding layer and having a constant predetermined wall thickness.
Claim 2
Dependent Claim
72 words
A fibre-type light wavelength conversion device for converting the wavelength of an incident light beam and issuing the incident light beam as a light beam having a predetermined wavelength, comprising: a core; a cladding layer provided around said core; and a transparent layer provided around said cladding layer, said transparent layer having a refractive index substantially equal to a refractive index of said cladding layer and having a constant predetermined wall thickness.
Claim 3
Dependent Claim
45 words
A device as set forth in claim 1, wherein said wall thickness is determined to satisfy the following condition of: d>l tan θ where d represents a diameter of said cylindrical layer, l represents an operating length of the device, and θ represents Cerenkov angle.
Claim 4
Dependent Claim
16 words
A device as set forth in claim 1, wherein said layer is made of a resin.
Claim 5
Dependent Claim
102 words
A fibre-type light wavelength conversion device for converting the wavelength of an incident light beam and issuing the incident light beam as a light beam having a predetermined wavelength, comprising: a core, a cladding layer provided around said core, and a transparent cylindrical layer provided around said cladding layer, said cylindrical layer having a refractive index substantially equal to a refractive index of said cladding layer and having a predetermined wall thickness satisfying the following condition of: d>l tan θ where d represents a diameter of said cylindrical layer, l represents an operating length of the device, and θ represents Cerenkov angle.
Claim 6
Dependent Claim
102 words
A fibre-type light wavelength conversion device for converting the wavelength of an incident light beam and issuing the incident light beam as a light beam having a predetermined wavelength, comprising: a core, a cladding layer provided around said core, and a transparent cylindrical layer provided around said cladding layer, said cylindrical layer having a refractive index substantially equal to a refractive index of said cladding layer and having a predetermined wall thickness satisfying the following condition of: d>l tan θ where d represents a diameter of said cylindrical layer, l represents an operating length of the device, and θ represents Cerenkov angle.
References Cited (Backward Citations)
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US4838638A
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US4874221A
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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) | 1993-12-31 | 1994-07-02 | 1995-01-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-12-31 | 1998-07-02 | 1999-01-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-12-31 | 2002-07-02 | 2003-01-01 | $7700.00 | Window Closed / Lapsed |