Device for writing to and reading from optical storage media

• US 5,325,116 A
• Filed: 09/18/1992
• Issued: 06/28/1994
• Est. Priority Date: 09/18/1992
• Status: Expired due to Term

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: Sampsell, Jeffrey B.
• Primary Examiner(s): KWON, JOHN
• Application Number:
  US07/947,248
• Time in Patent Office: 648 Days
• Field of Search: 346/108, 353/119, 353/122
• US Class Current: 347/255
• CPC Class Codes: G11B 7/0033 with cards or other card-like flat carriers, e.g. flat sheets of optical film
• CPC Class Codes: G11B 7/0045 Recording G11B7/006, G11B7/0065 take precedence
• CPC Class Codes: G11B 7/005 Reproducing G11B7/0065 takes precedence
• CPC Class Codes: G11B 7/12 Heads, e.g. forming of the optical beam spot or modulation of the optical beam disposition or mounting of head elements within housing or with provision for moving of light source, optical beam or detector, irrelevant to the transducing method G11B7/08 ; modulating lasers H01S3/10; controlling the intensity, colour, phase, polarisation or direction of light beams arriving from an independent light source, e.g. switching gating or modulating G02F1/00
• CPC Class Codes: G11B 7/1362 Mirrors

Abstract

A system for writing to, and reading from, optical media. For writing, the media changes when subjected to high intensity modulated light representing an image, such that the image is recorded. A deformable micro-mirror device (DMD) receives electrical input representing the image to be recorded. A high intensity light source illuminates the DMD, which reflects modulated light to an imaging lens. The lens focusses the image onto the media. To record multiple images on the same media, various embodiments provide for scanning across the media. For reading, the media is illuminated with uniform low intensity light. The DMD provides this uniform light, which is transmitted through a pre-recorded media to an image capture device.

Claims

1. A optical recorder for writing image data to an optical media that is capable of recording an optical image in response to modulated light, comprising:

an illumination source for providing light for writing to said media;

at least one condensing lens for focussing light from said source to a micro-mirror spatial light modulator;

a micro-mirror spatial light modulator having an array of micro-mechanical mirror elements, and an addressing means for providing electrical input to each of said mirror elements, wherein the electrical inputs to said array represent an image to be recorded, and wherein each mirror element is capable of reflecting light in a desired direction in response to said electrical input, such that light reflected from said array is amplitude modulated light representing said image;

an imaging lens for receiving said modulated light from said spatial light modulator and for focussing said light to an image frame position on an optical media; and

a first scan motion means for moving light from said imaging lens relative to the surface of said media in a first scan direction; and

a second scan motion means for moving the image plane of said imaging lens relative to the surface of said media in a second scan direction perpendicular to said first scan direction.

2. The optical recorder of claim 1, and further comprising a housing for containing said source, lens, spatial light modulator, and mirror, and wherein at least one of said first and said second scan motion means is means for moving said housing.

3. The optical recorder of claim 1, and further comprising a holder for removably securing said media, and wherein at least one of said first and said second scan motion means is means for moving said holder.

4. The optical recorder of claim 1, and further comprising a moveable scan mirror for receiving said image from said imaging lens, an actuator for controlling the motion of said scan mirror, and wherein said lens is a variable focus lens with a lens actuator for controlling its focus.

5. The optical recorder of claim 4, wherein said variable focus lens is a zoom lens.

6. The optical recorder of claim 4, wherein said lens actuator and said mirror actuator means are in communication, such that said lens actuator acts in response to said mirror actuator.

7. The optical recorder of claim 1, and further comprising an input interface for communicating electrical image data input to said spatial light modulator from a processor.

8. The optical recorder of claim 1, and further comprising an image capture device for reading said media.

9. A method of writing to an optical media that is capable of recording an optical image in response to modulated light, comprising the steps of:

providing data representing an image to be recorded to a micro-mirror spatial light modulator having an array of micro-mechanical mirror elements, and an addressing means for providing electrical input to each of said mirror elements, wherein the electrical input to said array represents an image, wherein each mirror element is capable of tilting in a desired direction in response to said electrical input, such that light reflected from said array is modulated light representing said image;

illuminating the surface of said spatial light modulator;

modulating the illuminating light in accordance with said electrical input;

using a lens to receive the modulated light from said spatial light modulator and to direct said light to an image frame position on said media; and

for each new image to be recorded, providing relative motion with respect to said media and the image plane of said lens, such that said lens is directed to a new image frame position.

10. The method of claim 9, wherein said step of providing relative motion comprises moving a housing containing said spatial light modulator and said lens over the surface of said media.

11. The method of claim 9, wherein said step of providing relative motion comprises moving said media under the light from said lens.

12. The method of claim 9, wherein said step of providing relative motion comprises directing light from said lens to a scan mirror and moving said scan mirror to said new image frame position, and refocussing said lens to said new image frame position.

13. The method of claim 12, and further comprising the step of using an actuator of said mirror to generate a signal representing the motion of said mirror and communicating said signal to an actuator of said lens.

14. The method of claim 12, wherein said step of refocussing said lens is accomplished by directing light from said scan mirror to a moveable focussing mirror, which moves in response to movement of said scanning mirror, and directs light to said new image frame position.

15. The method of claim 9, wherein said method is also for reading pre-recorded media, and further comprising the steps of using said spatial light modulator to provide light for reading said media, and capturing light transmitted through a prerecorded media.

16. A device for writing to and reading from an optical media that is capable of recording an optical image in response to modulated light, comprising:

an illumination source for providing high intensity light for writing to said media and lower intensity light for reading from said media;

at least one condensing lens for focussing light from said source to a digital micro-mirror device;

a micro-mirror spatial light modulator having an array of micro-mechanical mirror elements, and an addressing means for providing electrical input to each of said mirror elements, wherein the electrical inputs to said array represent an image to be recorded, wherein each mirror element is capable of moving to a desired direction in response to said electrical input, such that modulated light representing said image will be reflected from said array for writing to said media or such that uniform light may be reflected from said array for reading said media;

an imaging lens for receiving said modulated light from said spatial light modulator and for focussing said light to a frame portion of an optical media;

an image capture device for receiving light transmitted through said media during reading;

a first scan motion means for moving light from said imaging lens relative to the surface of said media in a first scan direction; and

a second scan motion means for moving the image plane of said imaging lens relative to the surface of said media in a second scan direction perpendicular to said first scan direction.

17. The optical recorder of claim 16, and further comprising a housing for containing said source, lens, spatial light modulator, and mirror, and wherein at least one of said first and said second scan motion means is means for moving said housing.

18. The optical recorder of claim 16, and further comprising a holder for removably securing said media, and wherein at least one of said first and said second scan motion means is means for moving said holder.

19. The optical recorder of claim 16, and further comprising a moveable scan mirror for receiving said image from said imaging lens and an actuator for controlling the motion of said scan mirror, and wherein said lens is a variable focus lens having a lens actuator for controlling its focus.