CN1890729B - Enhancing optical density - Google Patents
Enhancing optical density Download PDFInfo
- Publication number
- CN1890729B CN1890729B CN200480036678.XA CN200480036678A CN1890729B CN 1890729 B CN1890729 B CN 1890729B CN 200480036678 A CN200480036678 A CN 200480036678A CN 1890729 B CN1890729 B CN 1890729B
- Authority
- CN
- China
- Prior art keywords
- electromagnetic radiation
- print media
- emitter
- track
- focal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Images
Landscapes
- Optical Recording Or Reproduction (AREA)
Abstract
Optical density is an area that appears to a user to have full absorption appears black, which is enhanced on print media darkened by exposure to electromagnetic radiation. The print media(6)is divided(24)into at least one track(20). A defocused spot of electromagnetic radiation is created(26)within the track(20). The defocused spot of electromagnetic radiation darkens(28)the print media(6)within the track(20).
Description
Related application
Present patent application is that the commonly assigned U.S. Patent Application Serial Number of submitting on September 12nd, 2003 is 200311745 for " 10/660991 ", procurator's number of putting on record; Be entitled as the part continuation application of " optical disc drive focusing apparatus ", this patented claim is hereby incorporated by.The commonly assigned U.S. Patent Application Serial Number that this application also relates on September 12nd, 2003 to be submitted to is 200313592 for " 10/661394 ", procurator's number of putting on record; Be entitled as the patented claim of " optical disc drive focusing apparatus ", this patented claim is hereby incorporated by.The commonly assigned U.S. Patent Application Serial Number that this application also relates on September 12nd, 2003 to be submitted to is 200313596 for " 10/661752 ", procurator's number of putting on record; Be entitled as the patented claim of " optical disc drive focusing apparatus ", this patented claim is hereby incorporated by.
Invention field
The present invention relates generally to that the print media of deepening more particularly relates to strengthen the optical density (OD) on this print media through being exposed to electromagnetic radiation.
Background of invention
By convention, thus utilizing working-laser material in data side CD to be marked produces the blackening of expression data.CD drive reads these blackenings.Also sensing is said on the dish does not only reflect and reading of data CD drive through light is transmitted into.
In order more fully to utilize the free space on the CD, hoping provides data as much as possible on dish.In order to realize this purpose, reduce the density that spot size increases the data of storage.Reducing spot size as much as possible keeps still can reading and write data exactly simultaneously.
CD also can add label with image.Working-laser material is applied to the label side of this dish.Working-laser material through be exposed in the CD drive laser down and deepening or make marks.
For the time quantum of on working-laser material, creating or Print Label spent is the get on the right track function of width of speed and the dish of disc spins.Higher speed reduces the time-write interval, but there is the upper limit in the label of the speed of rotating disc and printing.
By convention, the track of broad can reduce the time-write interval, but between track, can reserve unmarked space.The distance that the track of broad separates the often width than the marker beam of adequate focusing is bigger, creates the required time of label so that reduce.Unmarked space visually combines with the space of mark and provides less than the complete outward appearance in the zone of mark.Unmarked space is white or other light color, and the space of mark is defined as black, and the possibility of result seems to be weaker than black completely.
Measuring of the amount of absorbed light is optical density (OD) (OD).Have the zone that absorbs fully In the view of the user and appear as black, and OD is 1.2.Higher OD value is possible, but In the view of the user they can not be darker.The routine of broad track is used and is often caused OD less than 1.2.
Narrower track causes the more track of per inch on dish, and this produces darker image, because between these tracks, there is less unmarked space.But narrower track needs the longer time-write interval, and reason is to exist bigger surf zone to want laser to cover.Therefore, will between print speed and OD, weigh.Utilize label that routine techniques prints and to have at least 1.2 OD and produce with narrower track, but this with Billy with the track of broad and have the label that produces less than 1.2OD and spend the longer time and print.
Summary of the invention
According to principle of the present invention, in one embodiment, on the print media of deepening, strengthen optical density (OD) through being exposed to electromagnetic radiation.This print media is divided at least one track.In this track, form the hot spot that defocuses of electromagnetic radiation.The hot spot that defocuses of electromagnetic radiation makes the print media deepening in the track.
The accompanying drawing summary
Fig. 1 has the diagram of the mass storage of the radial locator that disposes for the focal shift that makes electromagnetic radiation according to the present invention.
Fig. 2 is the process flow diagram of an embodiment of explanation the inventive method of being used to strengthen the optical density (OD) on the print media of the deepening through being exposed to electromagnetic radiation.
Fig. 3 is the process flow diagram that another embodiment of the inventive method of utilizing electromagnetic launcher to strengthen the optical density (OD) on the print media of the deepening through being exposed to electromagnetic radiation is described.
Fig. 4 is the figure of explanation optical density (OD) and focal shift when laser power is 45 milliwatts.
Fig. 5 is the figure of explanation optical density (OD) and focal shift when laser power is 70 milliwatts.
Fig. 6 is the set of image that for the various focal shifts that utilize 70 milliwatt laser powers, shows the print media of many tracks and spot size.
Detailed Description Of The Invention
Disclosure file description a kind ofly be used to strengthen the medium of optical markings such as the method and apparatus of the optical density (OD) on the CD.Inventor's experimental study shows, through laser spot size being defocused rather than utilizing the laser facula of focusing, can on the medium of optical markings, realize bigger mark hot spot and needn't reduce the linear velocity of medium with respect to laser.These experimental results are presented at the increment that has on the OD up to 30%, when keeping orbital spacing and linear velocity constant, laser are defocused simultaneously.Shifted signal through producing to the servo interpolation of laser focusing defocuses the servo constant pinpointed focus of discussing in the correlation circumstance that remains on usually of said laser focusing.This focal shift scheme helps to recover to cause quite a large amount of OD losses because of " dead space " between " excessively separating " track.In addition, the present invention allows to increase OD and can not increase to the required time of medium tagging.
An embodiment of mass storage 2 of the present invention has been described among Fig. 1.Mass storage 2 is configured to sacrificial vessel has the large-capacity storage media 4 of print media 6 to use, and this print media 6 covers at least a portion large-capacity storage media 4.
Large-capacity storage media 4 be can canned data any medium.In one embodiment, large-capacity storage media 4 is CDs.
In one embodiment, mass storage 2 comprises emitter of electromagnetic radiation 8, focused detector 10, offset controller 12, radial locator 14, randomly also can comprise computing machine 16, and program storage system 18.
Emitter of electromagnetic radiation 8 is any equipment that is configured to produce the electromagnetic radiation of the track 20 that is directed to print media 6.In one embodiment, emitter of electromagnetic radiation 8 is that emission wavelength is the generating laser of coherent light beam of the electromagnetic radiation of 780 nanometers.
Thereby radial locator 14 is to be configured for to be positioned emitter of electromagnetic radiation 8 to move away the focal length place of print media 6 produces the hardware that defocuses hot spot and the executable code of electromagnetic radiation in track 20 any combination because of focal shift.Defocus hot spot and make print media 6 deepenings in the track 20.The spot size that defocuses the hot spot generation is bigger than conventional focused spot size.
Shown in Fig. 1 as the program storage system 18 of single equipment.Alternatively, program storage system 18 can comprise more than equipment.And each equipment of program storage system 18 can be embodied as different media types.For example, an equipment of program storage system 18 can be magnetic storage medium, and another equipment of program storage system 18 can be electronic storage medium.
Fig. 2 illustrates the process flow diagram of the step of representing one embodiment of the invention.Although demonstrate the step of representing among Fig. 2 with particular order, the present invention comprises the variation of sequence of steps.And, under the situation that does not deviate from the scope of the invention, can between the step shown in Fig. 2, carry out extra step.
The hot spot that defocuses of electromagnetic radiation forms (26) in track 20.Defocus hot spot and make print media 6 deepenings in the track 20, perhaps change the optical characteristics of print media 6 in the track 20.In one embodiment, as shown in Figure 3, form the hot spot that defocuses of electromagnetic radiation through finding the focal length between (30) emitter of electromagnetic radiation 8 and the print media 6.Focal shift is applied to (32) this focal length.Focal shift can be any distance that realizes required effect (for example referring to Fig. 4-6).In one embodiment, focal shift is any distance of at least 20 microns.In another embodiment, focal shift is to be not more than any distance of 80 microns.
Emitter of electromagnetic radiation 8 location (34) are in the focal length place that moves away print media 6 because of focal shift.Emitter of electromagnetic radiation 8 produces the electromagnetic radiation that (36) are directed to print media 6.Focal shift is the distance (referring to Fig. 4) of positive quantity or negative quantity.
In one embodiment, find that the focal length between (30) emitter of electromagnetic radiation 8 and the print media 6 comprises the distance of discovery (30) apart from print media 6, in this distance, emitter of electromagnetic radiation 8 is transmitted into the focal beam spot of electromagnetic radiation on the print media 6.Can use several kinds of different focusing algorithm.For example, can use in related application, describe based on form, feedforward or adaptive servo algorithm be found to the focal length of print media 6.
Fig. 3 is a process flow diagram of also representing the step of another embodiment of the present invention.Although demonstrate the step of representing among Fig. 3 with particular order, the present invention comprises the variation of sequence of steps.And, under the situation that does not deviate from the scope of the invention, can between step shown in Figure 3, carry out extra step.
Between emitter of electromagnetic radiation 8 and print media 6, find (30) focal length.Emitter of electromagnetic radiation 8 is positioned (34) move away print media 6 because of focal shift focal length place.Focal shift is the distance (referring to Fig. 4) of positive quantity or negative quantity.
In one embodiment, find the focal length between (30) emitter of electromagnetic radiation 8 and the print media 6 through finding (30) apart from the distance of print media 6, in this distance, emitter of electromagnetic radiation 8 is transmitted into the focal beam spot of electromagnetic radiation on the print media 6.As previously mentioned, relevant application discloses the many selectable method that is used to find from the print media to the transmitter 8 distance.
Emitter of electromagnetic radiation 8 produces the electromagnetic radiation that (36) are directed to print media 6, thereby in track 20, forms the hot spot that defocuses of electromagnetic radiation.Defocus hot spot and make print media 6 deepenings in the track 20.
An advantage of system and method for the present invention has been to increase the optical density (OD) in the print media and can sacrificed speed.Can come the mark track according to the speed identical, but when utilization defocuses hot spot and comes mark, produce bigger optical density (OD) with the focal beam spot of electromagnetic radiation.
For example, the print media 6 that is activated or write by light or other electromagnetic energies need provide greatest optical density (OD) in the optimal optical density of specific period.For the focus type system, particularly have the focus type system (like compact-disc and dvd system) of large-numerical aperture, the optimum skew of objective focal length (with radial locator 14) causes the obvious change of spot size on the print media 6.The amount of the appointment of focal length (Z axle) skew minimum spot size focal length through making object lens can realize the obvious improvement of optical density (OD).Experiment test shows that optical density (OD) increases 30%-100%.
As exemplary data, Figure 4 and 5 have explained that OD changes and the focal shift of radial locator 14 at Z axle (focal length) when the laser rays speed of the track density of 1040 tracks of per inch and 0.5m/ second.Fig. 4 explanation OD when laser power is 45 milliwatts changes and skew, and Fig. 5 explanation is that 70 milliwatt OD of following time change and skew in laser power.Δ OD is OD poor in OD and the underlined district in unmarked district.Average OD is total OD on underlined surface.When widening track width (referring to Fig. 6) and comprise regional between the track, unmarked district reduces, and therefore average OD increases and more approaches the OD in underlined zone itself.Can see that Δ OD is quite approaching with the track of average OD.
Fig. 6 has the set that utilizes the experimental image of the test print media 6 that 70 milliwatt laser (transmitter 8) write with the track 20 of the orbital spacing of 1040 tracks of per inch and with the tracking velocity of 0.5m/ second.And what be next to track 20 demonstrations is the spot size 40 of the single pixel of explanation.There is not the example of skew to see that these tracks separate very wide distance like utilization.But, because offset distance increases along negative direction, thus OD increase up to approximately-50um, at this point place, the amount in power/zone mark print media 6 suitably in defocusing.As shown in Figure 5, OD has reduced-60um significantly.And show the effect of focus along the positive dirction skew.For the laser power that is set in 70 milliwatts, increase shown in Fig. 5 and 6 owing to just squinting, so in fact OD reduces.But for lower laser power, like 45 milliwatts among Fig. 4, in fact OD increases, but because further increase of skew, so OD reduces subsequently.It will be understood by those skilled in the art that to make the maximized actual shifts distance of OD depend on print media 6, electromagnetic launcher 8 and corresponding power level thereof, and print media 6 is with respect to the speed of electromagnetic launcher 8.4-6 only is used to explain a specific example embodiment.
Some embodiments of the present invention are only explained in top description.Those skilled in the art can design various interchangeable schemes and modification not deviating under the situation of the present invention.For example, can make transmitter 8 rotations of print media through motor with respect to radial location.Interchangeablely be, it is static that print media 6 can keep, and transmitter 8 moves with respect to print media 6.Print media 6 can also be and the CD material different.Therefore, the present invention comprises all these interchangeable schemes, modification and the variation in the scope that belongs to the claim of enclosing.
Claims (8)
1. the method for the optical density (OD) on the print media (6) of enhancing deepening through being exposed to electromagnetic radiation, this method comprises:
Print media (6) is divided into (24) at least one track (20),
In at least one track (20), form the hot spot that defocuses of (26) electromagnetic radiation, and
This defocuses hot spot and makes print media (6) deepening (28) in said at least one track (20).
2. according to the process of claim 1 wherein that print media (6) is divided into (24) at least one track (20) to be comprised print media (6) is divided into a plurality of concentric ring tracks (20).
3. according to the process of claim 1 wherein that print media (6) is divided into (24) at least one track (20) to be comprised print media (6) is divided into spiral path (20).
4. according to the process of claim 1 wherein that the hot spot that defocuses of formation (26) electromagnetic radiation comprises:
Find the focal length between (30) emitter of electromagnetic radiation (8) and the print media (6); Said focal length is meant the following such distance between emitter of electromagnetic radiation and the print media: in this distance, emitter of electromagnetic radiation is transmitted into the focal beam spot of electromagnetic radiation on the print media;
Be positioned at emitter of electromagnetic radiation (8) at the focal length place that moves away print media (6) because of focal shift; And
Produce the electromagnetic radiation that is directed to print media (6) from emitter of electromagnetic radiation (8).
5. a sacrificial vessel has the mass storage (2) that the large-capacity storage media (4) of print media (6) is used; This print media (6) covers at least a portion large-capacity storage media (4); Print media (6) deepening through being exposed to electromagnetic radiation, and be divided at least one track (20); This mass storage (2) comprising:
Emitter of electromagnetic radiation (8), the electromagnetic radiation that is configured to produce said at least one track (20) that is directed to print media (6);
Focused detector (10); Be configured to find the focal length between emitter of electromagnetic radiation (8) and the print media (6); Said focal length is meant the following such distance between emitter of electromagnetic radiation and the print media: in this distance, emitter of electromagnetic radiation is transmitted into the focal beam spot of electromagnetic radiation on the print media;
Radial locator (14) is configured to emitter of electromagnetic radiation (8) is positioned to move away because of focal shift the focal length place of print media (6), thereby in said at least one track (20), forms the hot spot that defocuses of electromagnetic radiation; And
Wherein this defocuses hot spot and makes print media (6) deepening in said at least one track (20).
6. according to the mass storage (2) of claim 5, further comprise offset controller (12), be configured to confirm focal shift and send this focal shift to radial locator (14).
7. according to the mass storage (2) of claim 5, wherein emitter of electromagnetic radiation (8) comprises generating laser.
8. method of utilizing electromagnetic launcher to strengthen deepening and being divided into the optical density (OD) on the print media (6) of (24) at least one track (20) through being exposed to electromagnetic radiation, this method comprises:
Find the focal length between (30) emitter of electromagnetic radiation (8) and the print media (6); Said focal length is meant the following such distance between emitter of electromagnetic radiation and the print media: in this distance, emitter of electromagnetic radiation is transmitted into the focal beam spot of electromagnetic radiation on the print media;
Emitter of electromagnetic radiation (8) is positioned (34) move away print media (6) through focal shift focal length place;
Produce the electromagnetic radiation that (36) are directed to print media (6) from emitter of electromagnetic radiation (8), thereby in said at least one track (20), form the hot spot that defocuses of electromagnetic radiation; And
This defocuses hot spot and makes print media (6) deepening (28) in said at least one track (20).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/660,991 US7084894B2 (en) | 2003-09-12 | 2003-09-12 | Optical disc drive focusing apparatus |
| US10/660,991 | 2003-09-12 | ||
| PCT/US2004/039925 WO2005062300A1 (en) | 2003-09-12 | 2004-11-29 | Enhancing optical density |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1890729A CN1890729A (en) | 2007-01-03 |
| CN1890729B true CN1890729B (en) | 2012-10-10 |
Family
ID=37591511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200480036678.XA Expired - Fee Related CN1890729B (en) | 2003-09-12 | 2004-11-29 | Enhancing optical density |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1890729B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1119476A (en) * | 1993-03-17 | 1996-03-27 | 德国汤姆逊-布朗特公司 | Compatible recording and/or playback device |
| EP1355191A1 (en) * | 2002-04-15 | 2003-10-22 | Fuji Photo Film Co., Ltd. | Laser marking on photosensitive material and photosensitive material including the marking |
| CN1459100A (en) * | 2001-03-12 | 2003-11-26 | 索尼株式会社 | Optical head, optical device, and aberration correcting element |
-
2004
- 2004-11-29 CN CN200480036678.XA patent/CN1890729B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1119476A (en) * | 1993-03-17 | 1996-03-27 | 德国汤姆逊-布朗特公司 | Compatible recording and/or playback device |
| CN1459100A (en) * | 2001-03-12 | 2003-11-26 | 索尼株式会社 | Optical head, optical device, and aberration correcting element |
| EP1355191A1 (en) * | 2002-04-15 | 2003-10-22 | Fuji Photo Film Co., Ltd. | Laser marking on photosensitive material and photosensitive material including the marking |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1890729A (en) | 2007-01-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5568461A (en) | Optical information recording and reproducing apparatus | |
| TWI338297B (en) | Enhancing optical density | |
| CA1296425C (en) | Method of recording a binary signal on an optically readable record carrier and apparatus for carrying out the method | |
| EP0265849A2 (en) | Optical recording/reproducing method and apparatus | |
| ATE253251T1 (en) | METHOD FOR CHANGING THE ROTATIONAL SPEED OF A STORAGE CARRIER FROM AN INITIAL SPEED TO A DESIRED SPEED | |
| CN100397510C (en) | Optical pickup with dual focal length | |
| EP0449121A2 (en) | Optical recording medium and recording/reproducing method therefor | |
| US4918661A (en) | Optical disk | |
| US7301875B2 (en) | Information recording device and information recording method | |
| JPH087282A (en) | Optical information recording medium and optical recording and reproducing device | |
| CN1890729B (en) | Enhancing optical density | |
| JP2008071422A (en) | Track jump control circuit | |
| CN100407309C (en) | Apparatus and method for recording an information on a recordable optical record carrier using oval spot profile | |
| EP1056085B1 (en) | Method and apparatus for recording/reproducing information allowing compatibility with different disc formats | |
| JP3307081B2 (en) | Optical disc master manufacturing method | |
| CN101322185A (en) | Optical pickup device | |
| CN1327414C (en) | Additional data channel in between marks | |
| JP3659524B2 (en) | Optical information recording method and apparatus | |
| JP3024119B2 (en) | Optical information recording / reproducing device | |
| JP2007514267A (en) | Improvement of optical density | |
| US20050213468A1 (en) | Method and device for optical recording and optical record carrier | |
| JP2007128649A (en) | Optical disk recording apparatus | |
| JP2006338810A (en) | Spherical aberration correction method for optical disk recording/reproducing device | |
| JP2007179702A (en) | Focusing controller of optical disk | |
| JPH064867A (en) | Method for recording optical information and device for recording and reproducing optical information |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20121010 Termination date: 20141129 |
|
| EXPY | Termination of patent right or utility model |