US4595810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for focusing a laser on a recording medium by wavelength modulation
Assignee: MagnaChip Semiconductor Ltd
•
Filing: 1984-01-18
•
Granted: 1986-06-17
•
Expires: 2004-01-18
Abstract
Abstract A device for focusing a laser on a recording medium by wavelength modulation is disclosed wherein the device includes a radiation source for providing a radiation beam of controllable frequency, a hologram intercepting the radiation beam for focusing the radiation beam as a function of its frequency, and a control system coupled to the radiation source for controlling the frequency of the radiation beam so as to focus the beam on a desired plane. The control system includes a sensor for detecting the focus of the radiation beam on a desired plane, and means for controlling the frequency of the radiation beam from the radiation source responsive to the detected focus.
Inventors
- 👤 Ronald L. Barnes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:40
CPC Classifications
G; G11; G11B; G11B7/00; G11B7/08; G11B7/09; G11B7/0908; G02; G02B; G02B5/00; G02B5/32; G11B7/085; G11B7/08547; G11B7/0909
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
79 words
A focusing apparatus for focusing a radiant beam on a desired plane comprising: a radiation source for providing a radiation beam of controllable wavelength; a hologram intercepting said radiation beam at a fixed distance from the desired plane, for focusing said radiation beam as a function of the wavelength of said radiation beam; and controlling means coupled to said radiation source for controlling the wavelength of said radiation beam so as to focus said beam on a desired plane.
Claim 2
Dependent Claim
79 words
A focusing apparatus for focusing a radiant beam on a desired plane comprising: a radiation source for providing a radiation beam of controllable wavelength; a hologram intercepting said radiation beam at a fixed distance from the desired plane, for focusing said radiation beam as a function of the wavelength of said radiation beam; and controlling means coupled to said radiation source for controlling the wavelength of said radiation beam so as to focus said beam on a desired plane.
Claim 3
Dependent Claim
59 words
The focusing apparatus of claim 1 wherein the controlling means includes focus detecting means for detecting the focusing of said radiation beam on a desired plane; and error detection and correction means responsive to said focus detecting means for generating a correction signal for controlling the wavelength of said radiation beam responsive to the focus of said radiation beam.
Claim 4
Dependent Claim
15 words
The focusing apparatus of claim 2 wherein said focus detecting means includes a quadrant detector.
Claim 5
Dependent Claim
30 words
The focusing apparatus of claim 1 wherein said radiation source comprises a tunable laser diode device, and said controlling means controls the electrical current of said tunable laser diode device.
Claim 6
Dependent Claim
65 words
The focusing apparatus of claim 1 wherein said radiation source comprises a dye laser generator, said dye laser generator including an amplifier chamber operable for receiving radiant energy of variable wavelength, and light separating means for angularly separating light into a spectrum, said light separating means operable to be oriented with respect to said amplifier chamber for supplying radiant energy thereto of a selectable wavelength.
Claim 7
Dependent Claim
39 words
The focusing apparatus of claim 5 wherein said controlling means is operable for changing the orientation of said light separating means with respect to said amplifier chamber thereby changing the wavelength of radiant energy supplied to said amplifier chamber.
Claim 8
Independent Claim
67 words
A method of focusing a radiant beam on a desired plane comprising: providing a radiation beam of controllable wavelength; intercepting at a fixed distance from a desired plane, said radiation beam with a hologram for focusing said radiation beam as a function of the wavelength of said radiation beam; and controlling the wavelength of said radiation beam so as to focus said beam on the desired plane.
Claim 9
Independent Claim
67 words
A method of focusing a radiant beam on a desired plane comprising: providing a radiation beam of controllable wavelength; intercepting at a fixed distance from a desired plane, said radiation beam with a hologram for focusing said radiation beam as a function of the wavelength of said radiation beam; and controlling the wavelength of said radiation beam so as to focus said beam on the desired plane.
References Cited (Backward Citations)
US4280215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |