EP0345232A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Integrated optical device for magneto-optical recording and reading head
Assignee: Nikon Corp
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Filing: 1989-04-10
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Granted: —
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Expires: 2009-04-10
Abstract
Abstract An integrated optical device (100) for magneto-optic recording and/or reading comprises a substrate (10), a waveguide (22) on the substrate for transmitting a light energy beam and including a plurality of waveguide sections, a laser (11) for supplying a light energy beam to a first one of said waveguide sections for transmission toward an end portion of the waveguide that is exposed to the outside of the substrate, and detectors (51, 52) for receiving, from a second one of the waveguide sections branched from the first waveguide section, a light energy beam entering said end portion from a magneto-optic recording medium (102). The amount of light arriving at the detectors depends upon the light polarization. The optical device includes polarization controllers (24, 26; 32, 34), polarization-selective waveguide sections (E-F, E-G), and laser-waveguide-detector combinations (12, 62, 64, 53, 54; 13, 66, 68, 55, 56) for tracking and focusing.
Inventors
- 👤 Zahirudeen Premji
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-28 15:22
CPC Classifications
G; G11; G11B; G11B11/00; G11B11/10; G11B11/105; G11B11/10532; G11B7/00; G11B7/12; G11B7/123; G11B7/124
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
124 words
An integrated optical device for magneto-optic recording and/or reading, comprising: a substrate; waveguide means provided on said substrate for transmitting a light energy beam and including one end portion exposed to the outside of said substrate, a first waveguide section lying along a surface of said substrate from said one end portion and a second waveguide section lying along said surface and branched from said first waveguide section; means for supplying a polarized light energy beam into said first waveguide section toward said one end portion; means for receiving said light energy beam entered from said one end portion and passed through said second waveguide section; and means for controlling the light amount arriving at said light sensing means in response to the polarization.
Claim 2
Dependent Claim
124 words
An integrated optical device for magneto-optic recording and/or reading, comprising: a substrate; waveguide means provided on said substrate for transmitting a light energy beam and including one end portion exposed to the outside of said substrate, a first waveguide section lying along a surface of said substrate from said one end portion and a second waveguide section lying along said surface and branched from said first waveguide section; means for supplying a polarized light energy beam into said first waveguide section toward said one end portion; means for receiving said light energy beam entered from said one end portion and passed through said second waveguide section; and means for controlling the light amount arriving at said light sensing means in response to the polarization.
Claim 3
Dependent Claim
18 words
An integrated optical device according to Claim 1, wherein said light supplying means emits a randomly polarized light.
Claim 4
Dependent Claim
25 words
An integrated optical device according to Claim 1 further comprising means for controlling polarization of said light energy beam transmitting into said first waveguide section.
Claim 5
Dependent Claim
27 words
An integrated optical device according to Claim 3, wherein said polarization control means includes electrodes having a periodic structure and being disposed along said first waveguide section.
Claim 6
Dependent Claim
26 words
An integrated optical device according to Claim 4, wherein said electrodes has the periodicity being proportional to the wavelength of said light from said light source.
Claim 7
Dependent Claim
37 words
An integrated optical device according to Claim 1, wherein said control means includes means for rotating polarization of light transmitting into said second waveguide section and means for dividing said light in accordance with polarization rotation angle.
Claim 8
Dependent Claim
32 words
An integrated optical device according to Claim 6, wherein said dividing means includes polarization selecting waveguides provided in said second waveguide section to divide said light into first and second polarization components.
Claim 9
Dependent Claim
37 words
An integrated optical device according to Claim 7, wherein said light sensing means includes first and second detectors and said polarization selecting waveguides transmit said first and second polarization components into said first and second detectors respectively.
Claim 10
Dependent Claim
27 words
An integrated optical device according to Claim 8, wherein said polarization rotating means includes electrodes having a periodic structure and being disposed along said second waveguide section.
Claim 11
Dependent Claim
26 words
An integrated optical device according to Claim 9, wherein said electrodes has the periodicity being proportional to the wavelength of said light from said light source.
Claim 12
Dependent Claim
127 words
An integrated optical device for magneto-optic recording and/or reading, comprising: a substrate; light source means provided on said substrate for emitting a polarized light energy beam; light sensing means provided on said substrate; waveguide means provided on said substrate and including one end portion exposed to the outside of said substrate, a first waveguide section disposed between said light source means and said one end portion to transmit said polarization light energy beam to said one end portion and a second waveguide section branched from said first waveguide section to transmit the light entered into said first waveguide means from said one end portion to said light sensing means; and means for controlling the light amount arriving at said light sensing means in response to the polarization.
Claim 13
Dependent Claim
127 words
An integrated optical device for magneto-optic recording and/or reading, comprising: a substrate; light source means provided on said substrate for emitting a polarized light energy beam; light sensing means provided on said substrate; waveguide means provided on said substrate and including one end portion exposed to the outside of said substrate, a first waveguide section disposed between said light source means and said one end portion to transmit said polarization light energy beam to said one end portion and a second waveguide section branched from said first waveguide section to transmit the light entered into said first waveguide means from said one end portion to said light sensing means; and means for controlling the light amount arriving at said light sensing means in response to the polarization.
Claim 14
Dependent Claim
22 words
An integrated optical device according to Claim 11, wherein said light source means includes a light source emitting a randomly polarized light.
Claim 15
Dependent Claim
28 words
An integrated optical device according to Claim 12, wherein said light source means further includes means for controlling polarization of said randomly polarized light from said light source.
Claim 16
Dependent Claim
27 words
An integrated optical device according to Claim 13, wherein said polarization control means includes electrodes having a periodic structure and being disposed along said first waveguide section.
Claim 17
Dependent Claim
26 words
An integrated optical device according to Claim 14, wherein said electrodes has the periodicity being proportional to the wavelength of said light from said light source.
Claim 18
Dependent Claim
20 words
An integrated optical device according to Claim 11, wherein said control means detects the amount of polarization rotation of light.
Claim 19
Dependent Claim
37 words
An integrated optical device according to Claim 11, wherein said control means incudes means for rotating polarization of light transmitting into said second waveguide section and means for dividing said light in accordance with polarization rotation angle.
Claim 20
Dependent Claim
32 words
An integrated optical device according to Claim 17, wherein said dividing means includes polarization selecting waveguides provided in said second waveguide section to divide said light into first and second polarization components.
Claim 21
Dependent Claim
37 words
An integrated optical device according to Claim 18, wherein said light sensing means includes first and second detectors and said polarization selecting waveguides transmit said first and second polarization components into said first and second detectors respectively.
Claim 22
Dependent Claim
27 words
An integrated optical device according to Claim 17, wherein said polarization rotating means includes electrodes having a periodic structure and being disposed along said second waveguide section.
Claim 23
Dependent Claim
26 words
An integrated optical device according to Claim 20, wherein said electrodes has the periodicity being proportional to the wavelength of said light from said light source.
Claim 24
Dependent Claim
114 words
An integrated optical device according to Claim 11 further comprising another light source means provided on said substrate for emitting another light energy beam, another light sensing means provided on said substrate and another waveguide means provided on said substrate, said another waveguide means including one end portion exposed to the outside of said substrate, a first waveguide section disposed between said another light source means and said one end portion to transmit said light energy beam to said one end portion and a second waveguide section branched from said first waveguide section to transmit the light entered into said first waveguide means from said one end portion to said another light sensing means.
References Cited (Backward Citations)
No citation records indexed.
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