CN100433137C

CN100433137C - Apparatus for recording data and visible images on an optical disc

Info

Publication number: CN100433137C
Application number: CNB2005100758087A
Authority: CN
Inventors: 森岛守人; 臼井章; 塩崎善彦
Original assignee: Yamaha Corp
Current assignee: Yamaha Corp
Priority date: 2001-10-31
Filing date: 2002-10-31
Publication date: 2008-11-12
Anticipated expiration: 2022-10-31
Also published as: CN1862672A; CN101071582B; CN1862672B; CN101071582A; CN1716392A

Abstract

An optical disk device records information by emitting a laser beam from a pickup at an optical disk. A scanning part scans the laser beam towards the recordable surface of the optical disk. A record control part controls the scanning part for information recording. A projection control part is arranged and is used to control the pickup and the scanning part according to image information to realize projecting a visual image at the optical disk, which ensures that the laser beam change between a first lighting intensity which can not act on the optical disk and a second lighting intensity which can act on the optical disk. When the laser beam has the first lighting intensity, a servo part periodically detects the laser beam reflected from the optical disk and controls the emission of the laser beam according to the detection servo towards the laser beam during the process of projecting the visual image. The projection control part controls the pickup, which is used for changing the image information from the second lighting intensity to the first lighting intensity by compulsion under the circumstance that the second lighting intensity is kept for preset time, so as to ensure that the servo part can detect the laser beam with the first lighting intensity to proceed with servo control.

Description

Can on card, throw the optical recording apparatus of visual picture

The application is that application number is CN 02148120.2, and the applying date is 2002.10.31, and the application people is a Yamaha Corporation, and is entitled as dividing an application of " optical recording apparatus that can throw visual picture on card ".Above-mentioned in first to file requirement right of priority, described right of priority-

Applicant country's applying date application number formerly formerly formerly

Japan 2001.10.31 JP 2001-335608

Japan 2002.4.24 JP 2002-122706

Technical field

The present invention relates to a kind of optical disc recording apparatus that can on the card of CD, form visual picture.

Background technology

CD-R can obtain on market as CD-R (can write down compact disk) and CD-RW.In order on these CDs, to write down several data,, need to adopt optical disc recording apparatus, as CD-R driver and CD-RW driver such as music data.For recorded information, one of these optical disc recording apparatus give off laser beam, and this light beam is modulated into corresponding with information to be recorded, and it is radiated on the recording surface of CD.

For the CD of some type, will be used for content information, the typographic(al) mark of carrying out visual display as the title of institute's recording musical and brief description or other record data is attached on another card opposite with the data recording side.In making the technology that these CDs carried out, adopt printing machine that title or other information are printed on such as on the circular flag page, and then this page guided and be fixed on the suitable card.

Yet, as mentioned above, making the required content information of visual display on it, need printing machine during as the CD of data title.Therefore, adopt optical disc recording apparatus with data recording after the recording surface of particular optical disk, after optical disc recording apparatus is sent CD, must carry out complicated processing.That is to say, an independent typographic(al) mark page or leaf of making of printing machine is pasted on the CD.

Summary of the invention

Be head it off, the object of the present invention is to provide a kind of optical disc recording apparatus, not only data can be recorded on the recording surface of CD, and image can be incident upon the temperature-sensitive surface of CD, be used for visible displaying contents information, and needn't make new device separately.

For realizing this purpose, the present invention designs a kind of optical disc recording apparatus, but in order to by with laser beam irradiation on the recording surface of CD with recorded information, it comprises: pick-up, but be used for the recording surface of laser beam irradiation at CD; Sweep test, but in order to the recording surface scanning laser beam with respect to CD; The record controls part is used to control described pick-up and sweep test, but realizes recording the information on the recording surface by irradiation and scanning laser beam; The projection control section, it controls described pick-up and sweep test according to picture information, but realization is incident upon visible image on the recording surface of CD, but but but make the laser beam be radiated on the recording surface between first light intensity that can not work and second light intensity that can work, change to the CD recording surface to the CD recording surface; And servo segment, but have under the first light intensity situation laser beam in order to periodically to detect from CD recording surface reflected back in laser beam, and according to the irradiation to detection described laser beam of servocontrol in projection visible image process of laser beam.Wherein said projection control section is controlled pick-up, be used under second light intensity situation of the maintenance schedule time, forcibly laser beam being changed to first light intensity from second light intensity according to picture information, thereby make described servo segment can detect laser beam, to continue to carry out servocontrol with first light intensity.

Described projection control section is preferably controlled pick-up, in order to keep surpassing under the situation of the schedule time in first light intensity, forcibly laser beam is changed to second light intensity from first light intensity according to picture information, thereby make described servo segment can detect laser beam, so that additionally laser beam is carried out servocontrol with second light intensity.

Described servo segment is preferably controlled pick-up, so that according to second light intensity of the detection with first intensity laser bundle being regulated laser beam.

Adopt this structure, when using the recording surface of laser beam irradiation CD, can form the visible image corresponding by making the recording surface variable color with picture information according to picture information.For the forming process of visible image, under situation about having given off laser beam for a long time with second light intensity of visual change recording surface according to picture information, no matter picture information how, to regulating described laser beam, and make it to be issued with first light intensity that does not change recording surface basically.So the result controls laser beam according to irradiation.

According to another aspect of the present invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises: pick-up, be used for laser beam irradiation at CD, described CD have an optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; Sweep test is used for respect to the CD scanning laser beam; The record controls part, when CD being arranged to expose its optical recording side, this recording control part divides work, in order to control described pick-up and sweep test, so that realize information is recorded on the described optical recording side by irradiation and scanning laser beam; The projection control section, when CD being arranged to expose its temperature-sensitive side, this projection control section work, in order to control described pick-up and sweep test according to picture information, thereby realize visible image is incident upon on the temperature-sensitive side of CD, the laser beam that is radiated on the temperature-sensitive side is changed between first light intensity that can not work to CD temperature-sensitive side and second light intensity that can work to CD temperature-sensitive side; And servo segment, have under the first light intensity situation in laser beam and periodically to detect the laser beam of returning, and, in projection visible image process, servocontrol is carried out in the irradiation of laser beam according to detection to laser beam from described CD reflection.Wherein said projection control section is controlled pick-up, in order to keep in second light intensity under the situation of preset time, forcibly laser beam is changed to first light intensity from second light intensity according to picture information, thereby make described servo segment can detect laser beam, to proceed servocontrol with first light intensity.

Described projection control section is preferably controlled pick-up, so that keep surpassing under the situation of the schedule time in first light intensity, forcibly laser beam is changed to second light intensity from first light intensity according to picture information, thereby make described servo segment can detect laser beam, so that additionally laser beam is carried out servocontrol with second light intensity.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can form the visible image corresponding by making the temperature-sensitive surface discolouration with picture information.Formation as for this visible image provides, when having given off laser beam for a long time with second light intensity on visual change temperature-sensitive surface according to picture information, then no matter picture information how, regulate laser beam, and make it to send with first light intensity that does not change the temperature-sensitive surface basically.So the result controls laser beam according to irradiation.

According to another aspect of the present invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises: pick-up, be used for illuminating laser beam, so that on CD, form the bundle spot, wherein said CD have an optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; Sweep test is used for respect to the described bundle spot of described CD scanning; The record controls part, under the situation of the optical recording side of CD being arranged to expose it, this recording control part divides work, in order to control described pick-up and sweep test, realizes recording the information on the optical recording side by irradiation and scanning laser beam; The projection control section, under the situation of the temperature-sensitive side of CD being arranged to expose it, this projection control section work is used to control described pick-up and sweep test, by irradiation and scanning laser beam realization visible image is incident upon on the temperature-sensitive side of CD; And bundle spot control section, the size of its control bundle spot, used another beam spot size when making the size of when projection visible image bundle spot greater than recorded information.

Described bundle spot control section preferably includes a focus servo mechanism of working in the recorded information process, in order to detect from the signal of the optical recording offside reflection laser beam of CD, so that with respect to the optical recording side laser beam is carried out servocontrol according to this detection signal.Described focus servo mechanism is used to throw in the process of visible image, in order to the size according to the described bundle spot of laser beam detection signal servocontrol that returns from the temperature-sensitive offside reflection of CD.

Described bundle spot control section is preferably in the process of throwing visible image and works, in order to control described beam spot size according to the laser beam of returning from the temperature-sensitive offside reflection of CD.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can form the visible image corresponding by making the temperature-sensitive surface discolouration with picture information.For the forming process of this visible image, this device increases the beam spot diameter, of the laser beam of sending to CD temperature-sensitive surface.Correspondingly, in each circle rotation process of CD, laser beam can cover bigger zone, and can reduce the time that forms visible image.

According to a further aspect of the invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises: pick-up, be used for laser beam irradiation at described CD, wherein this CD have an optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; Sweep test is used for scanning laser beam on CD; The record controls part, under the situation of the optical recording side of CD being arranged to expose it, this recording control part divides work, is used to control described pick-up and sweep test, by irradiation and scanning laser beam, realize recording the information on the optical recording side; The projection control section, under the situation of the temperature-sensitive side of CD being arranged to expose it, described pick-up and sweep test are controlled in this projection control section work, by irradiation and scanning laser beam, realize visible image is incident upon on the temperature-sensitive side of CD; And the gap adjustment part, it is configured to make its optical recording side according to CD or is to make its temperature-sensitive side regulate gap between pick-up and the CD towards pick-up, thus the projection of the record of optimization information and visible image repeatedly.

Preferably, when described temperature-sensitive side during towards pick-up, described gap adjustment partly makes described CD be configured to make the displacement of its optical recording side towards pick-up with respect to pick-up from CD.

Or in described temperature-sensitive side during towards pick-up, described gap adjustment partly makes pick-up be configured to make its displacement towards the optical recording side of CD with respect to described CD from pick-up.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can form the visible image corresponding by making the temperature-sensitive surface discolouration with picture information.After setting described CD, confirm that the surperficial still recording surface of temperature-sensitive is positioned to towards light picker, and the position of adopting this result to regulate between light picker and its apparent surface concerns.So, when although the distance between light picker and the apparent surface thereof is positioned to towards light picker at recording surface, and it is different when the temperature-sensitive surface alignment becomes towards light picker, also can avoid the difference that causes by its distance problem, and this is to cause all kinds control, is difficult to carry out such as focus control.

According to a further aspect of the invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises: pick-up, be used for laser beam irradiation at described CD, wherein this CD have wherein along the CD circumferencial direction be formed with guide channel the optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; Sweep test is used for scanning laser beam on CD; The record controls part, when CD being arranged to make its optical recording side towards pick-up, this recording control part divides work, in order to control described pick-up and sweep test, by irradiation and scanning laser beam, realize recording the information on the optical recording side; Servo segment, when CD being arranged to make its temperature-sensitive side towards pick-up, this servo segment work is in order to carry out servocontrol to sweep test, so that laser beam can track to guide channel according to the laser beam of returning from the offside reflection of CD temperature-sensitive; And projection control section, when CD being arranged to make its temperature-sensitive side towards pick-up, this projection control section work in order to controlling described pick-up, is incident upon visible image on the temperature-sensitive side of CD when being implemented in laser beam guide channel is tracked by illuminating laser beam.

Described sweep test preferably includes a rotating driver, is used for rotating disc; Also comprise a radial feed device, be used for that with scanning laser beam on CD, described rotary driver is worked in the process of projection visible image, be used for along writing down opposite direction rotating disc with information along the described pick-up of the radial feed of rotating disc.

Preferably, described servo segment is worked in the process that information is recorded to the optical recording side, in order to the gated sweep part, laser beam is tracked to guide channel to the exterior periphery part of CD from the middle body of disk inner, and this servo segment is worked in the process that visible image is incident upon the temperature-sensitive side, be used to control described sweep test, laser beam is tracked to guide channel to the central interior part of CD from the exterior periphery part of CD.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can make the temperature-sensitive surface discolouration and can form the visible image corresponding thereon with picture information.Here, when forming visible image, needn't adopt laser irradiating position control operation more complicated when information is recorded recording surface, the guide channel that forms in the detection record surface wherein, and along radially bundle spot position that the guide channel that is measured moves laser beam.

According to a further aspect of the invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises: pick-up, be used for laser beam irradiation at CD, wherein said CD have the optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; The rotary driving part branch is used for given rotational speed CD; Clock generation part, it produces has the clock signal that frequency is directly proportional with CD speed; The record controls part, when CD being arranged to make its optical recording side towards pick-up, this recording control part divides work, in order to control described pick-up, realizes recording of information by illuminating laser beam; The projection control section, when CD being arranged to make its temperature-sensitive side towards pick-up, this projection control section work, in order to control described pick-up according to given picture information, realize visible image is incident upon on the temperature-sensitive side of CD by illuminating laser beam, make and all modulated in each cycle laser beam of clock signal; Rotate the test section, be used for detecting CD and rotate each of enclosing constantly in projection visible image process; And sweep test, work when detecting CD and rotate a circle, in order to laser beam along rotating disc radially push away further interval, thereby in the process that visible image is incident upon the temperature-sensitive side on CD scanning laser beam.

Described projection control section is preferably in to detect when CD rotates a circle at every turn and operates, be used for controlling pick-up at a circle illuminating laser beam, with the projection of realization visible image, and the control pick-up is at next circle time-out illuminating laser beam, to prepare to throw visible image.

Described sweep test preferably includes a radial feed device, is used for sending pick-up along disc radial direction to given resolution; And comprise the servo control mechanism that tracks, be used for along the position of CD letter mark servocontrol laser beam, make described sweep test work when the resolution of stepped intervals being arranged to less than the radial feed device, so that utilize the described servo control mechanism that tracks, radially advance laser beam with described stepped intervals along rotating disc.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can make the temperature-sensitive surface discolouration, and can form the visible image corresponding thereon with picture information.For the visible image forming process, control is used for forming the irradiation of the laser beam of visible image to CD, and controls with the frequency corresponding with CD speed in each clock period, also promptly controls at each angular spacing of CD of set angle.So, can form the visible image (such as corresponding light intensity arranged) corresponding in the position relevant with each set angle of CD with picture information.

According to a further aspect of the invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises: pick-up, be used for laser beam irradiation at CD, wherein said CD have the optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; The rotary driving part branch is in order to rotating disc; Rotate the test section, in order to detect CD rotates a circle from a radial reference position of CD each moment; The record controls part is worked when CD being arranged to make its optical recording side towards pick-up, in order to control described pick-up, realizes recording of information by illuminating laser beam; The projection control section is worked when CD being arranged to make its temperature-sensitive side towards pick-up, in order to control described pick-up according to given picture information, realizes visible image is incident upon on the temperature-sensitive side of CD by illuminating laser beam; And sweep test, its work when detecting CD and rotate a circle, be used for laser beam along rotating disc radially push away further interval, thereby in the process that visible image is incident upon the temperature-sensitive side on CD scanning laser beam; Wherein described projection control section work when detecting CD rotation one circle, in order to drive the pick-up illuminating laser beam, so that begin to throw visible image from the described radial reference of CD position, work during in laser beam then near this radial reference position, before arriving the disc radial direction reference position, stop pick-up work, to stop to throw visible image in laser beam.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can form the visible image corresponding by making the temperature-sensitive surface discolouration with picture information.For the forming process of visible image, along with the rotation of CD, the reference position from CD gives off laser beam, to form visible image; And when laser beam is returned the reference position, do not send the laser beam that is used for forming visible image, go to shine and be positioned at the most approaching zone before the irradiation position.Therefore, even because specific reasons, instability such as CD is rotated, and laser radiation control is interfered and CD rotates, simultaneously when the place, reference position gives off laser beam, and pass through the reference position once more at irradiation position, also be that laser irradiating position moved to when making it irradiation position is superimposed with previous laser beam afterwards, can prevent that also the laser beam that forms visible image from shining at relevant position, thereby, the reduction of visible image quality can be prevented.

According to a further aspect of the invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on dissimilar CDs, it comprises: pick-up, be used for laser beam irradiation at CD, wherein said CD have the optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; Sweep test is used for respect to the CD scanning laser beam; The record controls part, when CD being arranged to expose its optical recording side, this recording control part divides work, in order to control described pick-up and sweep test, realizes recording the information on the optical recording side by irradiation and scanning laser beam; The CD test section is used to obtain the identifying information from CD, with pack into optical disc types in this device of identification; And projection control section, when CD being arranged to expose its temperature-sensitive side, this projection control section work, in order to control described pick-up and sweep test, to realize visible image is incident upon on the temperature-sensitive side of CD by irradiation and scanning laser beam according to the optical disc types of being discerned.

Preferably, described CD test section obtains the identifying information that is recorded in advance on the CD temperature-sensitive side.

Preferably, described CD test section obtains the identifying information that is recorded in advance on the CD optical recording side.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can make the temperature-sensitive surface discolouration, and form the visible image corresponding thereon with picture information.At this moment, can according to packing into CD type carry out visible image and form operation.

According to a further aspect of the invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises: pick-up, be used for laser beam irradiation at CD, wherein said CD have the optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; Coded portion is used for information to be recorded is encoded; The record controls part, when its optical recording side is exposed in the CD setting, this recording control part divides work, in order to controlling described pick-up illuminating laser beam according to the coded portion information encoded, thereby realizes the information of coding form is recorded on the optical recording side; The projection control section, when CD being arranged to reveal into its temperature-sensitive side, this projection control section work in order to control described pick-up illuminating laser beam according to picture information, is incident upon visible image on the temperature-sensitive side with realization; And the prevention part, in the process of projection visible image, work, be used to stop coded portion that picture information is encoded, make and throw visible image according to the picture information of non-coding form.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can make the temperature-sensitive surface discolouration, and can form the visible image corresponding thereon with picture information.The forming process of visible image hereto, owing to forbid the operation of code device, and not treating the data that are recorded to the temperature-sensitive surface encodes, promptly picture information is not encoded yet, therefore, do not need special data transport mechanisms to go to form the visible image corresponding, and can adopt the data transport mechanisms that is used for information is recorded to recording surface to form visible image with picture information.

According to a further aspect of the invention, design a kind of optical disc recording apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises: pick-up, be used for laser beam irradiation at CD, wherein said CD have the optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite; The record controls part, when CD being arranged to expose its optical recording side, this recording control part divides work, in order to according to the described pick-up illuminating laser beam of described information Control, thus the information of realization record; And projection control section, when CD being arranged to expose its temperature-sensitive side, this projection control section work, in order to control described pick-up illuminating laser beam according to picture information, with realization visible image is incident upon on the temperature-sensitive side, make and laser beam is controlled, be incident upon the gray shade scale of visible image on the CD temperature-sensitive side with formation according to the indicated gray scale of described picture information.

Adopt this structure, when using the temperature-sensitive surface of laser beam irradiation CD according to picture information, can make the temperature-sensitive surface discolouration, and can form the visible image corresponding thereon with picture information.For the forming process of described visible image, can control laser beam according to the gray level of each position (each coordinate position) on the temperature-sensitive surface indicated in the picture information, and can form the visible image of energy representing gradation.

According to a further aspect of the invention, a kind of image forming method, employing has the optical disk of optical pick-up pen recorder, but light picker wherein with laser beam irradiation on the recording surface of CD with recorded information, but and form visible image according to the lip-deep pictorial data of temperature-sensitive opposite of described CD with described recording surface, described method comprises the steps: to control the laser beam that described light picker sends, make light picker on the temperature-sensitive surface of described CD, form the visible image corresponding with pictorial data, simultaneously with irradiation position that described light picker gave off laser beam along lip-deep predetermined spirality of described temperature-sensitive or concentric circles path movement; Limit unit area by the temperature-sensitive surface is radially cut apart, make each unit area have fan shape, wherein comprise the spirality or the concentric circles path-segments of predetermined quantity; And control described laser beam in the irradiation timing that belongs on the respective section concentric path of each unit area, thereby control the light intensity of each unit area, make it to show the gray scale of described visible image.

According to the method, in temperature-sensitive when surface when giving off laser beam according to picture information, can make the temperature-sensitive surface discolouration, and can form visible image according to picture information with the irradiation CD.For the forming process of described visible image, can control laser beam according to the gray level of each position (each coordinate position) on the temperature-sensitive surface indicated in the picture information, and can obtain the visible image of energy representing gradation.

Description of drawings

Fig. 1 is the signal lateral sectional view of compact disk structure, can form visible image thereon by the optical disc recording apparatus of an embodiment of the present invention;

Fig. 2 represents the block scheme of the optical disc recording apparatus structure of the described embodiment of the invention;

Fig. 3 represents the structural representation as the light picker of optical disc recording apparatus parts (optical pickup);

Fig. 4 is used for illustrating the synoptic diagram that adopts optical disc recording apparatus to form the content information image of visible image on CD temperature-sensitive surface;

Fig. 5 represents to be used to show the laser radiation control and treatment that ganmma controller carries out when optical disc recording apparatus forms visible image on CD temperature-sensitive surface;

Fig. 6 represents the laser beam control method that adopted when optical disc recording apparatus forms visible image on CD temperature-sensitive surface;

Fig. 7 represents to carry out the synoptic diagram that laser power control is handled as the laser power control of optical disc recording apparatus parts;

Fig. 8 represents the retroeflection light beam of the laser beam sent to CD temperature-sensitive surface by the light picker of optical disc recording apparatus;

Fig. 9 represents as the FG pulse that rotation produced according to spindle motor of the frequency generator 21 of optical disc recording apparatus parts, and the clock signal that is produced according to this FG pulse;

Figure 10 represents the process flow diagram of the optical disc recording apparatus course of work;

Figure 11 represents the process flow diagram of the optical disc recording apparatus course of work;

Figure 12 represents to be recorded in the lip-deep panel ID of CD temperature-sensitive;

Figure 13 represents the shape by the retroreflection laser bundle that light receiving element received of the light picker of optical disc recording apparatus;

The beam spot size of the laser beam that the light picker that Figure 14 represents optical disc recording apparatus sends to CD temperature-sensitive surface;

Figure 15 represents to be used for determining that the laser irradiating position of optical disc recording apparatus has passed through the synoptic diagram of CD reference position method;

Figure 16 represents to be used for determining that the laser irradiating position of optical disc recording apparatus has passed through the synoptic diagram of CD reference position method;

Figure 17 represents that optical disc recording apparatus gives off laser beam so that the sequential chart of the operation that the formation visible image is carried out on CD temperature-sensitive surface;

Figure 18 represents the synoptic diagram of optical disc recording apparatus to its CD temperature-sensitive surface that gives off laser beam;

Figure 19 is that the explanation optical disc recording apparatus is in order to show the synoptic diagram of the method for visible image gray scale that forms on the CD temperature-sensitive surface;

Figure 20 is that the explanation optical disc recording apparatus is in order to show the synoptic diagram of the method for visible image gray scale that forms on the CD temperature-sensitive surface;

Figure 21 is that the explanation optical disc recording apparatus is in order to show the synoptic diagram of the method for visible image gray scale that forms on the CD temperature-sensitive surface;

Figure 22 is that the explanation optical disc recording apparatus is in order to show the synoptic diagram of the method for visible image gray scale that forms on the CD temperature-sensitive surface;

Figure 23 is that the explanation optical disc recording apparatus is in order to show the synoptic diagram of the method for visible image gray scale that forms on the CD temperature-sensitive surface;

Figure 24 is explanation is used for moving along the cd diameter direction method of laser irradiating position when optical disc recording apparatus forms visible image on CD temperature-sensitive surface a synoptic diagram;

Figure 25 represents the synoptic diagram of the details of laser power control that optical disc recording apparatus carries out;

Figure 26 represents to make the temperature-sensitive surface in the optical disc recording apparatus under the situation of light picker for wherein CD being arranged on, and for wherein CD being arranged to its temperature-sensitive surface opposite one side surface under the situation of light picker, position relation between CD and the light picker;

Figure 27 represents to be used to regulate the adapter schematic appearance of position relation between CD and the light picker;

Figure 28 represents to have the synoptic diagram of regulating the optical disc recording apparatus structure of position relationship function between CD and the light picker;

Figure 29 is the synoptic diagram that explanation is used to increase the beam spot diameter, method of the laser beam of sending to CD temperature-sensitive surface;

Figure 30 is the synoptic diagram that explanation is used for moving along the pre-groove that forms on one sidelights record surface, the back side, CD temperature-sensitive surface the visible image formation method of laser irradiating position;

Figure 31 represents the prohibited area of CD, forbids that wherein optical disc recording apparatus is used to form the laser radiation that visible image is carried out;

Figure 32 represents the block scheme of the modified structure of optical disc recording apparatus.

Embodiment

Embodiments of the invention are described with reference to the accompanying drawings.

A. the structure of embodiment

The present invention relates to a kind of giving off laser beam with the optical disc recording apparatus of irradiation CD recording surface.This optical disc recording apparatus not only has the function that information is recorded to recording surface, and has and give off laser beam, and is positioned at the CD temperature-sensitive surface of the opposite side of recording surface with irradiation, thereby forms the function corresponding to the visible image of picture information.At first explanation can form the structure of the CD of visible image thereon, and then illustrates and can record information on the CD, and forms the structure of the optical disc recording apparatus of visible image.

A-1. the structure of CD

At first, Fig. 1 represents the lateral sectional view of compact disk structure, can recorded information on its surface, can form visible image on another surface.As shown in fig. 1, CD D comprises protective seam 201, recording layer (recording surface) 202, reflection horizon 203, protective seam 204, photosensitive layer (temperature-sensitive surface) 205 and protective seam 206, with described sequential cascade.Should be pointed out that the concrete structure of the CD D that drawn among Fig. 1, but the size of each layer ratio is not limited to shown in Fig. 1.

Be formed with the pre-groove of spirality (guide channel) 202a in recording layer 202, in order to information is recorded to CD D, laser beam is sent along this pre-groove 202a.Therefore, be recorded information, CD D is arranged so that the light picker of the surface (calling recording surface in the following text) of its most close protective seam 201 (upside among Fig. 1) towards optical disc recording apparatus, and move the laser beam that light picker sends along pre-groove 202a.According to the present invention,, CD D is arranged so that the light picker of the surface (calling the temperature-sensitive surface in the following text) of its most close protective seam 206 towards optical disc recording apparatus on the surface of CD D, forming visible image.Then, for forming visible image, photosensitive layer 205 is carried out thermo-color by adopting the laser beam irradiation desired location.As mentioned above, except that formed photosensitive layer 205, the identical structure of CD-R that CD D has and tradition is used, thereby no longer the structure division of recording layer 202 is elaborated.For this manual, " temperature-sensitive surface " refers to by the surface of laser beam irradiation generation variable color, and the material that constitutes photosensitive layer 205 has this characteristic.

A-2. the structure of optical disc recording apparatus

Fig. 2 represents the block diagram of an embodiment of the present invention optical disc recording apparatus.As shown in Figure 2, optical disc recording apparatus 100 is connected with host personal computer (PC) 110, it comprises: light picker 10, spindle motor 11, RF (radio frequency) amplifier 12, servo circuit 13, demoder 15, control module 16, scrambler 17, strategy circuit 18, laser driver 19, laser power control 20, frequency generator 21, stepper motor 30, motor driver 31, electric machine controller 32, PLL (phaselocked loop) circuit 33, FIFO (first-in first-out) storer 34, drive-pulse generator 35 and buffering storer 36.

Spindle motor 11 rotates the CD D of data to be recorded, the number of times of servo circuit 13 control CD D rotations.Because the optical disc recording apparatus 100 in the present embodiment adopts CAV (Constant Angular Velocity) method to be used for record, so spindle motor 11 rotates according to control module 16 determined predetermined angle speed.

Light picker 10 gives off laser beam, with the CD D of irradiation by spindle motor 11 rotation, and its structure of drawing among Fig. 3.As shown in Figure 3, light picker 10 comprises: the laser diode 53 that is used for emission of lasering beam B; Diffraction grating 58; Be used for laser beam B is focused at the optical system on CD D surface; With the light receiving element 56 that is used to receive folded light beam.

In light picker 10, laser diode 53 receives the drive current (see figure 2) from laser driver 19, and with the light intensity consistent with the drive current B that gives off laser beam.In light picker 10, the laser beam B of being sent by laser diode 53 is separated into main beam, preceding light guide bundles and follow-up light beam, and this three-beam is focused at the surface of CD D by polarization beam apparatus 59, collimation lens 60, quarter wave plate 61 and object lens 62.This three-beam by object lens 62, quarter wave plate 61 and collimation lens 60, is reflected by polarization beam apparatus 59 once more through the surface reflection of CD D.Folded light beam sees through post lens 63 from here and transfers to light receiving element 56, and light receiving element 56 receives this folded light beam and exports them to RF amplifier 12 (see figure 2)s as light receiving signal.Then, RF amplifier 12 transfers to control module 16 and servo circuit 13 with these signals.

Keep object lens 62 by the focus actuator 64 and the actuator 65 that tracks, make it and to move along the optical axis direction of light beam B and along the diametric(al) of CD D.According to being received in the focus error signal and the error signal that tracks from servo circuit 13 (see figure 2)s, the focus actuator 64 and the actuator 65 that tracks move object lens 62 along optical axis direction and along the diametric(al) of CD D.The light receiving signal that servo circuit 13 transmits by RF amplifier 12 according to light receiving element 56, mobile in the above described manner object lens 62, thus can focus on and track operation.

CD 10 comprises preceding monitoring diode (not shown), and when laser diode 53 gave off laser beam, preceding monitoring diode receiving beam also produced electric current, and electric current transfers to laser power control 20 among Fig. 2 by light picker 10.

RF amplifier 12 will be amplified according to the RF signal that EFM (8 to 14 modulation method) produces and receives from light picker 10, exports the RF signal that is generated to servo circuit 13 and demoder 15.In order to reproduce, 15 pairs of EFM modulated rf signals that receive from RF amplifier 12 of demoder carry out the EFM demodulation, reproduce data thereby produce.

Be sent to servo circuit 13 be from control module 16 command signal, from having with the FG pulse signal of the frequency beam splitter 21 of the consistent frequency of spindle motor 11 revolutions and from the RF signal of RF amplifier.According to these signals, servo circuit 13 rotating spindle motors 11, and light picker 10 focused on or track.Being used for drives spindle motor 11 can be CAV (Constant Angular Velocity) method that is used for predetermined angle speed drive CD D with recording surface (see figure 1) that information is recorded to CD D or the method that forms visible image on the (see figure 1) of temperature-sensitive surface, or is used for rotating disc D to obtain CLV (constant linear velocity) method of preset lines speed in order to record.Optical disc recording apparatus 100 among this embodiment has adopted the CAV method, and servo circuit 13 comes rotating spindle motor 11 with control module 16 determined predetermined angle speed.

In memory buffer 36, store the information to CD D recording surface to be recorded (call in the following text and write data) and with to be formed on CD D temperature-sensitive surface the corresponding information (calling picture information in the following text) of visible image.The data that write that are stored in the memory buffer 36 export scrambler 17 to, and picture information exports control module 16 to.

17 pairs of data that write that receive from buffering storer 36 of scrambler are carried out the EFM modulation, and export the data that write that obtained to strategy circuit 18.Axle treatment for correcting when strategy circuit 18 is for example carried out the EFM signal that receives from demoder 17, and export gained EFM signal to laser driver 19.

Under the control of laser power control 20, laser driver 19 is according to laser diode 53 (see figure 3)s that receive and drive with the signal that writes data-modulated light picker 10 from strategy circuit 10.

The power that laser power control 20 control is given off laser beam by laser diode 53 (see figure 3)s of light picker 10.Specifically, laser power control 20 control laser drivers 19 make light picker 10 give off laser beam with the light intensity that matches with control module 16 determined laser power desired values.The laser power control that laser power control 20 is carried out is a FEEDBACK CONTROL, adopts the current value that preceding monitoring diode provided of light picker 10, sends the laser beam of light picker 10 with the target light intensity.

Host PC 110 provides and is stored in picture information in the memory buffer 36 and is transferred into FIFO storer 34 by control module 16 and is stored in wherein.In this case, FIFO storer 34 is stored in picture information, also is that host PC 110 provides to the picture information of optical disc recording apparatus 100, comprises following information.This picture information is in order to forming visible image on the surface of CD D, and as shown in Figure 4, for along with CD D center O being in n the coordinate (being represented by stain) in a plurality of concentric gardens in the center of circle each, writes the information of representing gray level (density).Picture information is represented the gray level of each coordinate points, according to the coordinate points P11, the P12 that are subordinated to interior circle ... and P1n, to the coordinate points P21 that belongs to outside adjacent circle, P22 ... and P2n, to along the coordinate points of the adjacent circle in outside, until order along the coordinate points Pmn of outermost circle.Representative is sent to FIFO storer 34 along the data of polar coordinates coordinate points gray level with said sequence.Should be pointed out that Fig. 4 is concrete figure, the position relation of the coordinate points of clearly having drawn, and the position of actual coordinate has more high density.When host PC 110 adopts general bit map method to be formed on picture information to be formed on the CD D temperature-sensitive surface, host PC 110 not only needs to convert data bitmap to described polar data, and the picture information of gained need be sent to optical disc recording apparatus 100.

For forming visible image according to the picture information that so receives on the temperature-sensitive surface of CD D, PLL circuit 33 is sent to FIFO storer 34 with the picture record clock signal.Each time clock of picture record clock signal, also the i.e. information of one of representative initial coordinate points of being stored gray level exports drive-pulse generator 35 to by FIFO storer 34.

Drive-pulse generator 35 produces the timing that driving pulse gives off laser beam with control light picker 10.The pulse width that the driving pulse that drive-pulse generator 35 produces has with read from FIFO storer 34 and represent the information of each coordinate points gray level consistent.For example, when the gray level of a preferred coordinate point higher (density is higher), shown in the top among Fig. 5, the driving pulse that drive-pulse generator 35 produces has the pulse width of prolongation for writing level (second light intensity).When gray level was low, shown in the bottom among Fig. 5, the driving pulse that drive-pulse generator 35 produces had the pulse width that reduces for writing level.Writing level is following power level, and when went up on the temperature-sensitive surface (photosensitive layer 205) that CD D was sent and be radiated to the laser beam of this level, the temperature-sensitive surface was by variable color significantly.When above-mentioned driving pulse transferred to laser driver 19, for the pairing time of this pulse width, light picker 10 sent the laser beam with writing level.Therefore, when gray level was higher, it is longer that the laser beam with writing level is sent the time, and bigger zone is arranged by variable color in the unit area on CD D temperature-sensitive surface.So it is the zone with high gray scale that the user can discern domain of dependence with visual manner.In the present embodiment, different in the unit area (unit length) by the length of color change interval, thus show picture information with the gray level of representative wherein.Servo level (first light intensity) is following power level, and when with the temperature-sensitive surface of laser radiation CD D with this level power, its surface does not have material alterations.For the zone that does not need variable color, only send the laser beam with this servo level rather than the laser beam of writing level.

After each coordinate points being produced and represents the corresponding to driving pulse of gray-scale information, if need carry out power control by laser power control 20, perhaps by servo circuit 13 control that tracks, so, no matter this information how, drive-pulse generator 35 has extremely short-period writing level pulse, perhaps inserts servo level pulse.For example, when shown in Fig. 6 top, must send the writing level laser beam in time T 1, with according to the gray level representation visible image at preferred coordinate place in the picture information time, and when sending the writing level laser beam in the time T 1 of being longer than predetermined servo period ST, with control during laser power, what will have a utmost point short period t servoly closes pulse (servo off-pulse) and (SSP1) is inserted in the ending of servo period ST.And when shown in Fig. 6 bottom, must send servo level laser beam in the time that equals or be longer than servo period ST, when showing visible image with gray level according to picture information, middle preferred coordinate place, and when sending the writing level laser beam in the time T 1 of being longer than predetermined servo period ST, with control during laser power, servo unbalanced pulse (servoon-pulse) (SSP2) is inserted in the ending of servo period ST.

As mentioned above, the electric current that provided of the preceding monitoring diode 53a that given off laser beam according to laser diode 53 (see figure 3)s that are used to receive light picker 10 of laser power control 20 is controlled laser power.More particularly, as shown in Figure 7, maintenance (S201 and S202) that 20 pairs of laser power controls send with preceding monitoring diode 53a and the corresponding value of light intensity of the laser beam that receives is sampled.Then, because laser power control 20 control laser powers, thereby, when giving off laser beam with writing level as desired value, also promptly when producing the writing level driving pulse (seeing Fig. 5 and 6), keep the result to be used for sampling by the target writing level that is transmitted by control module 16 give off laser beam (S203).In addition, because laser power control 20 control laser powers, so when giving off laser beam with servo level as desired value, also promptly when producing servo level drive pulse (seeing Fig. 5 and 6), sampling keeps the result to be used to by the servo level of target that is transmitted by control module 16 give off laser beam (S204).Therefore, when the driving pulse that is in writing level or servo level is not when exporting the time of being longer than predetermined servo period (sampling period) ST continuously, then force to insert servo pulse SSP1 or the servo unbalanced pulse SSP2 of closing, and no matter the content of picture information, and available aforesaid way carries out laser power control to each level.

Insert the servo pulse SSP1 that closes and be not only in order to control laser power, and be used for the focusing of being undertaken by servo circuit 13 or the control that tracks.That is to say,, also promptly send and from the laser beam (folded light beam) that CD D returns, control and focus control track according to laser diode 53 according to the RF signal that the light receiving element (see figure 3) of light picker 10 is received.When Fig. 8 is illustrated in laser beam irradiation photosensitive layer 205 (see figure 1)s, the illustration signal that is received by light receiving element 56.As shown in Figure 8, the writing level laser beam that is reflected comprises the peak value Partial K 1 that is in the laser beam rise time and the maintained shoulder Partial K 2 of level after this, and dash area can be considered the energy that is used to make photosensitive layer 205 variable colors.Be used for the energy of photosensitive layer 205 variable colors is not limited to constant particular value, but can according to circumstances change.Therefore, can estimate that the shape of dash area is at any time all in variation.That is to say that the folded light beam of writing level laser beam has been carried too much noise, thereby can not always obtain stable folded light beam, and when adopting this folded light beam, it will disturb accurate focusing and the control that tracks.Therefore, when sending the writing level laser beam continuously in the time that is prolonging as mentioned above, can not obtain the folded light beam of servo level laser beam, thereby can not correctly carry out focus control and servocontrol.

Here it is is the servo pulse SSP1 that closes of assorted petty insertion, thereby can periodically obtain the folded light beam of servo level laser beam, and carries out focus control and servo-controlled reason according to the folded light beam that is obtained.For on the temperature-sensitive surface of CD D, forming visible image, be different from the situation of recorded information on recording surface, needn't track this moment along preformed pre-groove (guide channel) in CD D.Therefore, in this embodiment, the desired value of controlling is set at fixed value (preset value) with tracking.

This control method not only can be used to form picture information on the temperature-sensitive surface, also is used in and forms picture information on the recording surface.That is to say, when adopting material that its reflectivity not only but also its color can the changes by laser beam irradiation to be used for recording surface (recording layer 202), can form image on the recording surface and on the temperature-sensitive surface.But owing to when on recording surface, forming visible image, can not on relevant portion, carry out original data record, so the zone that preferably will be used for record data separates with the zone that is used to form visible image.

Equally preferably reduce to insert servo closing pulse SSP1 and required time of servo unbalanced pulse SSP2 to greatest extent, various servocontrol are had a negative impact such as laser power control, track control and focus control avoiding.Under the situation that significantly reduces the insertion time, can carry out these different servocontrol, and seldom influence formed visible image.

Refer again to Fig. 2, PLL circuit (signal output apparatus) 33 be in by frequency generator 21 provided and the frequency consistent with spindle motor 11 rotating speeds under the FG pulse signal doubly taken advantage of, and export the clock signal that is used to form visible image, this will be illustrated in the back.Frequency generator 21 adopts the counter electromotive force current by the motor driver acquisition of spindle motor 11, and with the frequency output FG pulse consistent with spindle revolutions.For example, when frequency generator shown in Fig. 9 top 21 produces 8 FG pulses spindle motor 11 rotations simultaneously, one circle, also promptly when CD D rotation one circle is shown in Fig. 9 bottom, 33 outputs of PLL circuit have the frequency (frequency that for example is equivalent to 5 times of FG pulse signals that is equivalent to a plurality of FG pulses, perhaps rotate 40 pulses that are in level H in the circle process at CD D) clock signal, also i.e. output has the clock signal with the corresponding to frequency of spindle motor 11 couples of CD D rotating speed.So, by doubly taking advantage of FG clock signal that pulse signal obtains to export FIFO storer 34 to by PLL circuit 33, and for each cycle of clock signal, also, will export drive-pulse generator 35 to from data FIFO storer 34, that represent a coordinate points gray level promptly for each rotation of the CD D that is positioned at special angle.The clock signal that adopts PLL circuit 33 to produce by doubly taking advantage of the FG pulse to obtain.And when employing has the motor of reliable and stable driving force, substitute PLL circuit 33, can adopt crystal oscillator to produce above-mentioned clock signal, also promptly have clock signal with the consistent frequency of CD D rotating speed by doubly taking advantage of the FG pulse to obtain.

Stepper motor 30 is used for moving light picker 10 along the diametric(al) of packing into CD D.Motor driver 31 is with the speed rotaty step motor 30 consistent with electric machine controller 32 pulse signal that provided.Include the move sign on of light picker 10 along diameter travel direction and distance according to what control module 16 sent, electric machine controller 32 produces corresponding pulse signal, and exports it to motor driver 31.When stepper motor 30 when the diametric(al) of CD D moves light picker 10, and when spindle motor 11 rotating disc D, the laser irradiating position of light picker can be set in a plurality of positions on the CD D, and above-mentioned parts have constituted the irradiation position regulating device.

Control module 16 is made of CPU (CPU (central processing unit)), ROM (ROM (read-only memory)) and RAM (random access memory), and, make and to be controlled with one heart to the recording operation of CD D recording surface and to the imaging operation on the temperature-sensitive surface of CD D according to the various piece of program stored control optical disc recording apparatus 100 among the ROM.

The structure of the optical disc recording apparatus 100 of present embodiment is illustrated.

B. the course of work of present embodiment

The following describes the course of work of the optical disc recording apparatus 100 of structure like this.As mentioned above, optical disc recording apparatus 100 can be to the recording surface recorded information of CD D, and Tathagata can also form and the corresponding visible image of host PC 110 picture information that provides on the temperature-sensitive surface of CD D from the music information of main frame PC110.The following working condition that the optical disc recording apparatus 100 that can carry out data recording and visible image imaging is described with reference to Figure 10 and 11.

In the time of in optical disc recording apparatus 100 that CD D is packed into, at first, control module 16 control ratios such as light picker 10, and judge and whether record ATIP on CD D and light picker 10 facing surfaces (absolute time in the pre-groove) data.As is generally known the person, the ATIP data are to be recorded in data on the CD-R recording surface in advance along pre-groove, and when recording the ATIP data, can judge that recording surface that CD D is configured to make it is towards light picker 10.When not writing down the ATIP data, can judge that temperature-sensitive surface that CD D is configured to make it is towards light picker 10.That is to say that control module 16 detects to be had/no ATIP data, and which surface of judgement CD D is towards light picker 10.Except that said method,, towards light picker 10, can adopt another kind of method with which surface of determining CD D for detection has/no ATIP data.For example, when carrying out focus servo operation, can adopt the surface of servo content recognition CD D towards light picker 10.That is to say, because very big between light picker and the CD D reverse side apart from difference, so which surface of depending on CD D is towards light picker 10, difference between its distance can influence the focus servo control value, and, can discern the surface of CD D of adorning towards light picker 10 by this value.

When on CD D, recording the ATIP data, suppose the recording surface that CD D is arranged to make it towards light picker 10, and control module 16 operates, be used for writing data recording to recording surface (step Sa2) with what host PC 110 provided.Because it is identical with the operation that conventional optical disc pen recorder (CD-R driver) is carried out that record writes the operation of data, so no longer further specify.

When on CD D, not detecting the ATIP data, suppose the temperature-sensitive surface that CD D is arranged to make it towards light picker 10, and control module 16 judges whether the panel ID of CD D can obtain (Sa3).In the present embodiment, the panel ID of CD D is recorded in (see figure 1) on the temperature-sensitive surface of the CD D with recording surface and temperature-sensitive surface.As shown in figure 12, the outermost periphery along CD D temperature-sensitive surface writes down and the corresponding visible image of panel ID data code.In the present embodiment, as shown in Figure 12,, form and corresponding reflector space 301a of its code length and non-reflector space 301b along its outermost periphery for panel ID being recorded on the temperature-sensitive surface of CD D.Control module 16 is along the track laser irradiating position of light picker 10 of the outer most edge of CD D, and obtains panel ID according to folded light beam.

Therefore, when not forming in the outermost portion on temperature-sensitive surface, can judge that CD D is not for to have the normal optical disk on temperature-sensitive surface, as CD-R with corresponding reflector space 301a of panel ID and non-reflector space 301b.In the time can not obtaining panel ID in this case, control module 16 is judged the CD (step Sa4) of CD for the imaging of forbidding visible image, and the user is informed in this judgement.

When can be when CD D obtains panel ID, control module 16 be waited for and is sent the imaging instruction (step Sa5) that contains picture information up to host PC 110.After sending imaging instruction, control module 16 carries out initialization, to form visible image (step Sa6) on the temperature-sensitive surface of CD D.Specifically, control module 16 allows servo circuit 13 with predetermined angular velocity rotating spindle motor 11, perhaps send instruction, light picker 10 is moved to interior initial position along CD D diameter, and allow electric machine controller 32 drive stepping motor 30 to electric machine controller 32.

In addition, in the initialization procedure of imaging, control module 16 sends target focus control values to servo circuit 13, makes the beam spot diameter, of beam spot diameter, greater than to the recording surface recorded information time of laser beam that CD D temperature-sensitive surface is shone.

More specifically illustrate under the situation of determining above-mentioned desired value it is the focus control operation of carrying out below.As mentioned above, servo circuit 13 carries out focus control according to the signal of light receiving element 56 outputs of light picker 10.With data recording to the process of CD D recording surface, servo circuit 13 drives focus actuator 64 (see figure 3)s, makes four regional 56a, 56b, 56c and the 56d of light receiving element 56 forms among Figure 13 center receive the circular retroreflection light A among Figure 13.That is to say,, then drive focus actuator 64, (a+c)-(b+d)=0 is set up if the luminous flux that receives among regional 56a, 56b, 56c and the 56d is defined as a, b, c and d.

For on the temperature-sensitive surface of CD D, forming visible image, carry out focus control, make to the beam spot diameter, of the laser beam of its temperature-sensitive surface irradiation beam spot diameter, greater than to the recording surface recorded information time.The retroreflection light that is received when light receiving element 56 be shaped as ellipse (B or C among Figure 13) time, because the bundle spot of laser beam B or C is greater than the bundle spot of circular laser beam A, servo circuit 13 drives focus actuator 64, makes light receiving element 56 can receive this ellipse retroreflection light.In other words, drive focus actuator 64 feasible (a+c)-(the b+d)=α (α is non-vanishing) of satisfying.Therefore, in the present embodiment, control module 16 and servo circuit 13 constitute bundle spot control device.

As mentioned above, in the initialization procedure that forms visible image, when if control module 16 allows servo circuits 13 to be set at α (non-vanishing), can be with laser beam irradiation CD D temperature-sensitive surface with beam spot diameter, beam spot diameter, greater than to the recording surface recorded information time.Because the beam spot diameter, of the beam spot diameter, of the laser beam that CD D temperature-sensitive surface is shone greater than to the recording surface recorded information time is so can get following effect.That is to say, in the present embodiment, when CD D rotates, give off laser beam, in order to form visible image and with data recording to recording surface.Therefore, when increasing the beam spot diameter, of laser beam, can in the short period of time visible image be formed on the whole temperature-sensitive surface of CD D.Below with reference to Figure 14 its reason is described.When large beam spot diameter BS is compared with the tuftlet spot that given off laser beam as can be seen, in Figure 14 concrete shown in like that, when CD D rotated a circle, at beam spot diameter, BS greatly the time, the area size that is used for forming visible image was expanded.So, when beam spot diameter, BS hour, must make CD D rotate more times, (in the example of Figure 14, when beam spot diameter, BS is big, rotate 4 circles visible image is formed on its whole zone; Perhaps at beam spot diameter, BS hour, rotate 6 circles), thus need time expand to form image.Reason for this reason, in the process that forms visible image, the beam spot diameter, of the laser beam that the optical disc recording apparatus 100 in the present embodiment sends is bigger during than data recording.

In the initialization procedure of imaging, control module 16 determines that laser power control 20 is used for the desired value of writing level and servo level, makes light picker 10 give off laser beam by writing level consistent with gained panel ID and servo level.That is to say,, the desired value of writing level and servo level is stored among the ROM of control module 16 for each of multiple panel ID type.Control module 16 reads corresponding to the writing level of gained panel ID and servo level desired value, and these desired values are indicated to laser power control 20.

For these reasons, set described target power value according to panel ID.Can be according to the type of CD D and different as the characteristic of the photosensitive film of photosensitive layer 205, and when its characteristic variations, the characteristic of sending the power level of the laser beam that is used to make the temperature-sensitive surface discolouration correspondingly changes to some extent.Therefore, with the photosensitive layer 205 of the laser beam irradiation particular optical disk D that is in specific writing level and good variable color the time, the photosensitive layer 205 of another kind of CD D just can not always make it variable color by the laser beam irradiation with this same writing level.Therefore, in this embodiment,, obtain the desired value of writing level and servo level in advance by experiment for CD corresponding to different panel ID.Then, the desired value that is obtained is stored among the ROM, thereby can carries out laser power control according to the characteristic of the photosensitive layer 205 of different discs D with the form that is associated with each panel ID.

When control module 16 carries out above-mentioned initialization, in fact begun visible image is formed on the lip-deep process of CD D temperature-sensitive.As shown in figure 11, at first, control module 16 transmits the picture information (step Sa7) that receives through memory buffer 36 from main frame PC110 to FIFO storer 34.Then, control module 16 adopts from the FG pulse signal of frequency generator 21 receptions and judges whether the predetermined reference position of the CD D that spindle motor 11 rotates has passed through the laser irradiating position (step Sa8) of light picker 10.

Be used to detect predetermined reference position and be used to judge the whether method by the reference position of laser irradiating position below with reference to Figure 15 and 16 explanations.As shown in figure 15, frequency generator 21 is exported both FG pulses of determined number (being 8 FG pulses in this example), and spindle motor 11 rotates a circle simultaneously, and just CD D rotates a circle.Therefore, control module 16 is synchronously exported a FG pulse that receives from frequency generator 21 constantly with the rising of basic pulse, detects pulse as the reference position.Then, control module 16 synchronously produced a reference position constantly with the rising that detects last pulse of pulse (being the 8th pulse in this example) from the reference position and detects pulse signal in the time that is equivalent to a circle.Detect pulse owing to produce the reference position, be identified as the moment of the laser irradiating position of light picker 10 by CD D reference position so this pulse can be produced the moment.Specifically, as shown in Figure 16, suppose that pulse generation light picker 10 laser irradiating positions are constantly detected in first reference position is defined as the position shown in the solid line (owing to light picker 10 can move along diametric(al), so obtainable irradiation position is represented by straight line).Even rotating circle back generation reference position detection pulse, the laser irradiating position of light picker 10 also is the position shown in the solid line.As mentioned above, when producing the detection pulse of first reference position, the residing diametric straight line of this laser irradiating position is defined as the reference position, comes detection laser irradiation position passing through when the each rotation one of CD D is enclosed CD D reference position thereby control module 16 can adopt the reference position that produces to detect pulse signal.Dot-and-dash line among Figure 16 is represented from the example track of the laser irradiating position of the moment when pulse is detected in next reference position of generation that produces a special datum position probing pulse.

After the imaging instruction of receiving from host PC 110, control module 16 detects laser irradiating position during the reference position by CD D as stated above, on behalf of the variable R of revolution, control module 16 will add 1 (step Sa9), and whether judgment variable R is odd number (step Sa10).

In the case, when controller receives that when detecting after the imaging instruction by the reference position first, R=0 (initial value)+1=1 sets up, and be odd number in step Sa10 identification variable R.When identification variable R when being odd number, control module 16 allows light pickers 10 to give off laser beam the temperature-sensitive surface of irradiation CD D to form visible image (step Sa11).Specifically, detect pulse owing to receive the reference position, so control module 16 control various pieces, the feasible clock signal of having exported from the picture information and the PLL circuit 33 of FIFO storer 34 is output successively synchronously.Under the control of control module 16, as shown in figure 17, after each time clock of receiving from PLL circuit 33, with a coordinate points gray level of expression, export drive-pulse generator 35 to from the information of FIFO storer 34.According to the gray level of described information representation, drive-pulse generator 35 produces the driving pulse with respective pulses width, and exports it to laser driver 19.So light picker 10 only gives off laser beam with writing level in the time consistent with each coordinate points gray level, with the temperature-sensitive surface of irradiation CD D.Because irradiation area is by variable color, thus visible image can be formed, as shown in Figure 18.

Shown in concrete among Figure 18, because CD D is rotated by spindle motor 11, so, in a clock signal period (rising that is carved into next pulse during from the rising of a pulse is elapsed time constantly), the laser irradiating position of light picker 10 moves one along circumference and is equivalent to the distance in zone shown in the C among Figure 18.When laser irradiating position is by zone C, change the time of shining according to gray level with the writing level laser beam, make in zone C, different by the size of color change interval along with different gray levels.Owing to when sending the writing level laser beam, regulate the time of passing through each zone C according to the gray level of each coordinate points, so can on the temperature-sensitive surface of CD D, form the visible image consistent with picture information.

Carry out above-mentioned irradiation operation with after forming visible image in control module 16 usefulness according to the laser beam of picture information control, control module 16 is back to step Sa7, and the picture information that is provided by memory buffer 36 is sent to FIFO storer 34.Then, control module 16 judges whether the laser irradiating position of CD D has passed through the reference position of CD D.If control module 16 is judged laser irradiating position by the reference position, then it adds 1 with variable R.Then, if variable R becomes and is even number, then control module 16 is controlled various pieces, and stops using the laser beam (step Sa12) that is used to shine CD D and forms visible image.Specifically, control module 16 stops the information of representing each coordinate points gray level and the clock signal that is received from PLL circuit 33 synchronously to be sent to drive-pulse generator 35 from FIFO storer 34.That is to say, after forming visible image, when control module 16 rotates another circle at CD D, promptly stop using laser beam irradiation temperature-sensitive surface and make it variable color with the writing level laser beam.

After control module 16 had stopped being used for the laser beam irradiation of visible image formation, control module 16 indication motor controllers 32 moved preset distance (step Sa13) along diametric(al) to outer rim with light picker 10.After receiving this instruction, electric machine controller 32 is by motor driver 31 drive stepping motor 30, thereby light picker 10 moves predetermined distance to outer rim.

As mentioned above, can suitably determine the described preset distance that light picker 10 moves along diametric(al) according to the beam spot diameter, BS (seeing Figure 14) that light picker 10 is given off laser beam.That is to say,,, the laser irradiating position of light picker 10 must be moved to the surface of very close CD D for forming high-quality image on the temperature-sensitive surface of CD D, forming visible image.Therefore, when light picker 10 is defined as with the laser beam beam spot diameter, BS that is used to shine CD D when basic identical along the length of diametric(al) displacement unit, can be very near the giving off laser beam outwardly of CD D, thereby can form high-quality image.Because multiple factor, such as the characteristic on temperature-sensitive surface, the zone that variable color can take place is bigger than institute's emission of lasering beam beam spot diameter.In the case, when considering the color change interval width, only need to be defined as making it not overlapping displacement unit with adjacent color change interval.In the present embodiment, because beam spot diameter, BS is used for the beam spot diameter, of data recording to recording surface greater than (such as about 20 μ m), so control module 16 allows electric machine controller 32 drive stepping motor 30, makes light picker 10 move the distance that equals beam spot diameter, BS substantially along diametric(al).Should be pointed out that recent stepper motor 30 usefulness 10 μ m are that unit adopts the μ step technique to regulate displacement.Therefore, can realize adopting stepper motor 30 well is that unit moves light picker 10 along diametric(al) with 20 μ m.

Light picker 10 had both moved set a distance along diametric(al) after, in order to change the target writing level value of laser beam, control module 16 indication laser power controls 20 utilized the writing level that has upgraded, thus emission of lasering beam (step Sa14).In the present embodiment, the method that is used to form visible image is the CAV method, by it, gives off laser beam when CD D rotates with Constant Angular Velocity.When light picker 10 was shifted to outer rim in the above described manner, its linear velocity increased.Therefore, when light picker 10 moves (to outer rim) along diametric(al), target writing level value is set at greater than currency,, also can makes the light intensity of the laser power that is obtained to make the fully variable color of temperature-sensitive surface of CD D even make when on-line velocity changes.

Moved at light picker 10 along diametric(al), and after the target writing level has changed, control module 16 judge whether any untreated, be used for the picture information that visible image forms, that is to say does not still have the picture information that is not sent to drive-pulse generator 35.If do not have this picture information, then this EO.

If there is the picture information that is not sent to electric machine controller 32 as yet, then step Sa7 is returned in programmed control, and repeats to form the operation of visible image.Specifically, control module 16 is sent to FIFO storer 34 (step Sa7) with picture information, and judges whether laser irradiating position has passed through the reference position (step Sa8) of CD D.If by the reference position, then on behalf of the variable R of revolution, control module 16 will add 1 (step Sa9) to laser irradiating position, and judge whether the variable R of upgrading is odd number (Sa10).If variable R is an odd number, then control module control various piece gives off laser beam to form visible image.If variable R is an even number, then control module 16 stops to send the laser beam (giving off laser beam with servo level) that is used to form visible image, and carries out control operation, such as moving light picker 10 along diametric(al) and changing target writing level value.That is to say, if in once specific rotation process, send the laser beam (containing writing level) that is used for imaging, and with its irradiation CD D, then control module 16 stops to be used for the laser radiation of imaging in rotation process next time, and alternatively light picker 10 is moved along diametric(al).Owing to be the change of in the rotation process that does not carry out imaging, carrying out the mobile and target writing level of light picker 10, so imaging stops, the irradiation position and the performance number that are given off laser beam simultaneously are changed, and can begin to be used for the laser radiation of imaging after irradiation position and laser beam intensity are determined.Therefore, can protect the quality of visible image can not worsen along diametric moving because of light picker 10.

The groundwork process of present embodiment optical disc recording apparatus 100 has been described.According to this optical disc recording apparatus 100, need not to install in addition printing equipment, the various piece that just can utilize light picker 10 to recording surface, and can give off laser beam data recording and is used to shine the temperature-sensitive surface that is located on the CD D, to form visible image according to picture information.

In addition, in the present embodiment, come clocking by utilizing the FG pulse that 11 rotations are produced according to spindle motor, also the clock signal that is promptly produced according to CD D revolution is controlled the timing of laser radiation in view of the above.Therefore, optical disc recording apparatus 100 can obtain laser irradiating position and need not positional information from CD D.Thereby, optical disc recording apparatus 100 is not limited only to the special CD D that wherein is formed with pre-groove (guide channel) in the temperature-sensitive surface that makes, and the visible image consistent with picture information can be formed on the temperature-sensitive surface that does not form pre-groove, and do not provide positional information in advance.

C. retrofit

The present invention is not limited to the foregoing description, can followingly make multiple remodeling.

(remodeling 1)

In the above-described embodiments, according to visible image as one man be the gray level of each coordinate points of containing from the picture information that host PC 110 receives, the control laser irradiation time makes it to show the gray scale of the visible image that forms on the CD D temperature-sensitive surface.Yet, the information of each coordinate points gray level of expression can be used to change the writing level of laser power, thereby can show the gray scale of visible image.For example shown in Figure 19, the variable color amplitude that is it when the characteristic on the temperature-sensitive surface of CD D (photosensitive layer 205: see Fig. 1) according to its heat energy that applies what and appropriateness changes, by adding to different energy, as E1, E2 or E3, and make the variable color amplitude on its temperature-sensitive surface change into D1, D2 or D3.Therefore, for wherein being formed with CD D, only need to change the writing level of laser beam according to the gray level shown in each coordinate points in the picture information with this specific character temperature-sensitive surface.Therefore, can make CD D go up the part generation variable color at each coordinate points place according to gray level, thereby can show the gray scale of visible image.

Outside this method according to gray level change writing level value, a plurality of adjacent coordinates points can be defined as and be used for the unit area of representing gradation level, and can make the laser radiation cycle of these contained in this unit area coordinate points associated with each other, thereby can show the gray level of the visible image that forms on the CD D temperature-sensitive surface.Specifically, as shown in figure 20, according to optical disc recording apparatus 100, the laser irradiating position of light picker 10 is moved repeatedly along circular path TR (by among Figure 20 shown in the dot-and-dash line), and the performance number that gives off laser beam in this moving process is changed into writing level or servo level according to picture information.So, can form visible image.

According to this remodeling, the sector region that belongs to the adjacent circular paths TR by cutting apart the fan-shaped part of CD D gained that will contain both determined number (in this example being three) is defined as unit area TA (among Figure 20 shown in the solid line).Moment of giving off laser beam of control belongs to three circular paths of this unit area TA with irradiation, makes the gray scale that can show visible image among the TA of constituent parts zone.

For example, for in specific unit area TA, forming the high density image, in the following adjusting laser radiation cycle, shown in the top of Figure 21, make all three circular path TR that belong to described specific unit zone TA that variable color (the variable color part is shown in the solid line part) all take place.That is to say, form picture information, make drive-pulse generator 35 produce the driving pulse shown in the bottom of Figure 21, and at laser irradiating position when three circular path TR that belong to the zone TA of relevant unit pass through, give off laser beam continuously with writing level.

For in the TA of specific unit zone, forming low-density image (this density is non-vanishing), the following adjusting laser radiation cycle, shown in the top of Figure 22, in three circular path TR that belong to this specific unit zone TA, has only the fraction generation variable color of interior circular path TR.That is to say, form picture information, make the driving pulse that drive-pulse generator 35 produces shown in the bottom of Figure 22, wherein laser irradiating position pass through along interior circular path TR during, only send the writing level laser beam between some.

For pressing the specific unit area TA of intermediate density performance, the following adjusting laser radiation cycle, shown in the top of Figure 23, in three circular path TR that belong to this specific unit zone TA, along the entire portion of interior circular path TR and along half part generation variable color of middle circular path TR.That is to say, form picture information, make drive-pulse generator 35 produce the driving pulse shown in the bottom of Figure 23, wherein during laser irradiating position passes through along interior circular path TR with, and in the part-time that laser irradiating position passes through along middle circular path TR, send the writing level laser beam.

Host PC 110 is produced as the picture information that constituent parts zone TA provides above-mentioned gray scale performance in advance, and this picture information is sent to optical disc recording apparatus 100.Therefore, can on the temperature-sensitive surface of CD D, form the visible image that constituent parts zone TA provides the gray scale performance.

(remodeling 2)

According to the foregoing description, when forming visible image by giving off laser beam simultaneously CD D rotate one time from the reference position, send control operation to, just light picker 10 is moved preset distance along the outside direction of diameter, and laser irradiating position is moved to the position on very close CD D surface.Yet being used for can not controlling with 20 μ m along some mechanism of diametric(al) driving light picker 10 is the displacement of unit representation.For the optical disc recording apparatus that this driving mechanism wherein is installed, increased the CD portion size that laser beam can not be shone, the result has reduced and has been formed on the lip-deep visible image quality of temperature-sensitive.

Be used for moving the controllability of drive unit of light picker 10 when low along diametric(al), can adopt move the control of the drive unit of light picker 10 along diametric(al), and to the control that tracks of light picker 10, so that with less unit, such as 20 μ m along the diameter adjustment laser irradiating position.Specifically, at first, the diametric(al) drive unit moves to position A as stepper motor with light picker 10.Then, when light picker 10 was fixed on A place, position, the control that tracks was so that be positioned at position A1 with laser irradiating position along diameter.Then, by irradiation position being located at the A1 place, the rotating disc D simultaneously that gives off laser beam, thus form visible image.And after irradiation position is fixed in the visible image formation end at A1 place, controls the outside displacement a of laser irradiating position by tracking, and be set in position A2, simultaneously light picker 10 is set in position A.Then, rotating disc D the time, give off laser beam with this understanding, to form visible image.Similarly, when light picker 10 is fixed in position A, the order of laser irradiating position according to A3, A4 and A5 moved, thereby continue imaging process by the control that tracks.

When the imaging process was finished, when laser irradiating position was set in position A5, drive unit was light picker 10 outside displacement A, and light picker 10 is set in position B.When light picker 10 is fixed on position B,, the outside displacement a of laser irradiating position to position B1, B2, B3, B4 and B5, and is continued imaging operation by the control that tracks.Owing to adopted by stepper motor and controlled, to move light picker 10 along diametric(al) and the control that tracks, so, even, also can move laser irradiating position by littler parasang being used for moving the controllability of drive unit of light picker 10 when low along diametric(al).

(remodeling 3)

The used optical disc recording apparatus 100 of the foregoing description adopts the CAV method, in view of the above, for forming visible image, in Constant Angular Velocity rotating disc D, gives off laser beam.Yet, also can adopt the CLV method of linear velocity constant.When adopting the CAV method,,, should increase the writing level value of laser beam along with laser irradiating position outwards moves through CD D in order to obtain high-quality visible image; Yet, when adopting CLV, needn't change the writing level value.Therefore, can not be reduced in the image quality that forms on the CD temperature-sensitive surface because of the fluctuation of target laser power value.

(remodeling 4)

In addition, in the above-described embodiments, laser power control 20 is controlled laser power according to the light-receiving result of the preceding monitoring diode 53a place acquisition of light picker 10, makes laser beam send (see figure 7) with target writing level or the servo level of target.In addition, in the above-described embodiments, adopt when laser diode 53 gives off laser beam with the target writing level, the light-receiving result that preceding monitoring diode 53a obtains makes the light intensity of the laser beam that laser diode 53 sends to be complementary with the target writing level.In addition, adopt the light-receiving result that monitoring diode 53a obtains before laser diode 53 is when servo level gives off laser beam with target, make the light intensity of the laser beam that laser diode 53 sends to be complementary with the servo level of target.

In the operation of adopting the servo level control of target writing level and target laser power, except that the result that the laser beam of sending with these target levels by reception obtains, also can adopt the result that laser beam was obtained who sends with the servo level of target by receiving, with the laser power of controlled target writing level and the servo level of target.Specifically, according to receiving the result that laser beam was obtained (current value) who sends with the servo level of target, laser power control 20 obtains current value SI, offers laser diode 53, so that laser diode 53 is given off laser beam, shown in the top of Figure 25 with the servo level value SM of target.When obtaining current value SI when being provided for giving off laser beam with servo level SM, such shown in the bottom of Figure 25, SI obtains the supplying electric current value (obtaining in advance by experiment) of laser diode 53 and the relation between the output current value SI by the employing current value, and by adopting linear function to obtain representing the slope of this relation.Then, the target writing level WM that relation that 20 employings of laser power circuit are obtained and control circuit 16 are set obtains current value WI, offers laser diode 53, so that send the writing level laser beam.The electric current WI that laser power control 20 allows laser driver 19 so to obtain offers laser diode 53.By this way, need not promptly can control sending of writing level laser beam by receiving the result that laser beam was obtained who sends with the target writing level.

In the foregoing description and described remodeling, in giving off laser beam with the process that forms visible image, the light-receiving result at monitoring diode 53a place carries out FEEDBACK CONTROL to laser power before adopting.Yet, in the process that visible image forms, can not carry out FEEDBACK CONTROL is the may command laser power, thereby carries out the laser radiation test before visible image forms, and the light-receiving result that monitoring diode 53a obtains before adopting offers laser diode 53 with current value.When required time of imaging more in short-term, light picker 10 move and the fluctuation of surrounding environment (temperature) less, thereby can not control laser power satisfactorily even do not carry out FEEDBACK CONTROL yet.Therefore, the optical disc recording apparatus of imaging can be carried out at short notice, also the laser power control of not following FEEDBACK CONTROL can be adopted.

(remodeling 5)

In the above-described embodiments, read panel ID,, and carry out laser power control (seeing Figure 12) according to the optical disc types that is identified with pack into optical disc types in the optical disc recording apparatus 100 of identification from the outer most edge on the temperature-sensitive surface of CD D.Can read panel ID from the zone (read-in area) of reading in of CD D recording surface, and on CD D temperature-sensitive surface, form in the process of visible image, can carry out laser power control according to the optical disc types that panel ID is discerned.For the zone of reading in from recording surface obtains panel ID, at first, the user is assembled into CD and makes recording surface towards light picker 10, and optical disc recording apparatus 100 reads in the panel ID that CD D is read in the zone from it, indicates the user to overturn then and inserts CD again.When CD D was arranged so that its temperature-sensitive surface towards light picker 10, optical disc recording apparatus 100 can be according to carrying out laser power control from reading in the panel ID that the zone obtains, and form visible image on the temperature-sensitive surface of CD D.

(remodeling 6)

As we in the above-described embodiments as described in the person, optical disc recording apparatus 100 uses the various piece that information is recorded to the light picker 10 of recording surface, can form visible image on the temperature-sensitive surface, wherein the temperature-sensitive surface is an opposite side of recording surface.For CD-R, be stacked in the thickness 1.2mm of the protective seam on the recording layer 202 201 among Fig. 1, and the thickness that protective seam 206 is gone up on another surface is very little.Therefore, as shown in Figure 26, when installing with CD D in recording surface or the temperature-sensitive surface which face relevant towards light picker 10, CD D goes up and to differ about 1.2mm apart from d1 and d2 (relative position relation) between the position of the position of the layer that laser beam should shine and light picker 10.

If between supposition light picker 10 and the CD D recording surface is focusing distance apart from d1, design light picker 10 with this, when then distance reached d2 between light picker 10 and surface to be illuminated, its focus actuator 64 (see figure 3)s just can not be carried out focus control well.Therefore, a mechanism can be set, when CD D is arranged to make its temperature-sensitive surface towards light picker 10, by it, CD D is remained on position with the about 1.2mm of light picker 10 spacing distances, thereby the temperature-sensitive surface conforms to d1 basically with distance between the light picker 10.

As this kind mechanism, as shown in Figure 27, can adopt an adapter (relative position regulating device) 271, this adapter can be dismountable from the clamping part 270 at CD D center.When optical disc recording apparatus 100 that CD D is packed into makes its temperature-sensitive surface towards light picker 10, only need CD D mounting adapter 271.

In addition, optical disc recording apparatus 100 can comprise following mechanism, and it can move near the position during CD D packs optical disc recording apparatus 100 into and between the position of certain distance with interval, and has changed the position that keeps CD D.Only when CD D was arranged so that its temperature-sensitive surface towards light picker 10, this mechanism just can move near the position that CD D is set, and was used to regulate the position that keeps CD D.

Adopting adapter 271 that CD D position is moved apart outside the light picker 10, as shown in figure 28, a driving mechanism (relative position regulating device) 280 can be set, when CD D is arranged to make its temperature-sensitive surface towards light picker 10, by the distance of CD D between temperature-sensitive surface and CD that light picker 10 is moved apart be d1.

(remodeling 7)

In the above-described embodiments, carry out focus control according to the light beam that returns from CD D and receive by light receiving element 56 (see figure 3)s of light picker 10, and for carrying out this focus control, adopted beam spot diameter, greater than record data during to recording surface the laser beam of the beam spot diameter, that gives off laser beam shine the temperature-sensitive surface of CD D.In addition, in this embodiment, in order to increase beam spot diameter,, drive focus actuator 64, the light-receiving result that light receiving element 56 is obtained is elliptical shape B and C shown in Figure 13.The light flux values that receives among four regional 56a, 56b, 56c and the 56d of instead of optical receiving element 56, can adopt the light beam total amount that receives in light receiving element 56 each zone to carry out focus control, thus can be with the temperature-sensitive surface of beam spot diameter, greater than gained elliptical shape B and the C laser beam irradiation CD D as a result the time as light-receiving.That is to say that when the beam spot diameter, of the laser beam of sending to CD D temperature-sensitive surface increased, light receiving element 56 can not receive all retroreflection lights, and shown in the round z among Figure 29, obtains the retroreflection light than the bigger zone of optical receiving region of light receiving element 56.Therefore, when driving total amount that focus actuator 64 make light receiving element 56 receiving beams, servo circuit 13 during the light beam total amount as a result the time, can send the laser beam that has than the large beam spot diameter to the temperature-sensitive surface of CD D less than the light-receiving of justifying A and oval B and C in obtaining as Figure 13.

(remodeling 8)

When very material transparent is made protective seam 205 (see figure 1)s of CD D; even be arranged to make its temperature-sensitive surface towards light picker 10 CD D, optical disc recording apparatus 100 also can detect the pre-groove (guide channel) that forms in CD D recording surface from the Returning beam (folded light beam) of CD D.Specifically, different with situation about giving off laser beam to recording surface, the writing level of retroeflection is higher with the pre-groove of laser beam irradiation the time, and the writing level of retroeflection is lower when irradiation spine.Therefore,, can detect pre-groove by detecting the level of retroreflection light, so, can be along the control that tracks of pre-groove.

When CD D is arranged to make its temperature-sensitive surface towards light picker 10, and in the time can tracking control, just can give off laser beam, form visible image, move laser irradiating position along pre-groove simultaneously along the pre-groove in the opposite sidelights record surface.The pre-groove that in detecting temperature-sensitive surface opposite one sidelights record surface, forms, with the control that tracks, thereby when pre-groove moves laser irradiating position, spindle motor 11 along with record data during to recording surface opposite direction rotate, and CD D is along backward rotation.Below with reference to Figure 30 the counter-rotational reason of CD is described.Shown in the top of Figure 30, when in the recording surface of CD D, forming the pre-groove PB of spirality, see that from recording surface it is clockwise spiral, if but from its reverse side, the instant heating sensitive surfaces is seen pre-groove PB, shown in Figure 30 bottom, be counter-clockwise spiral just then.Therefore, as CD D when identical rotation direction is rotated with data recording the time from interior position PBS along pre-groove PB, laser irradiating position can not move along pre-groove.So, if want to move laser irradiating position, form visible image to give off laser beam by temperature-sensitive surface to CD D along pre-groove PB, then CD D is along rotating in the opposite direction with record data to recording surface time side.

Therefore, when laser irradiating position moves along predetermined PB, and form timing and the laser power of controlling laser radiation according to image, so that use with embodiment in identical mode when forming visible image, 16 of control modules need indication servo circuit 13 along the opposite direction rotating spindle motor 11 during to recording surface with record data.

In addition, if want on the temperature-sensitive surface, to form visible image, simultaneously the pre-groove PB that forms in the recording surface of laser irradiating position moves, suppose that laser irradiating position is defined as the outermost position PBE of pre-groove PB, even then CD D identical rotation direction along with its record the time is rotated, also can move laser irradiating position along pre-groove PB.

(remodeling 9)

In the foregoing description, among the predetermined prohibited area KA on CD D temperature-sensitive surface, control module 16 can be forbidden the irradiation that imaging laser beam (writing level laser beam) is carried out in Figure 31.Clockwise when mobile from said reference position (seeing Figure 16) when laser irradiating position, then as shown in figure 31, described prohibited area KA is for having the sector region of predetermined angular along counter-clockwise direction from the reference position.That is to say that when CD D rotates and laser irradiating position moves from the reference position and gives off laser beam when being used to form visible image, prohibited area KA is for to return the zone that reference position eve laser irradiating position is passed through at laser irradiating position.

In order to forbid forming visible image in prohibited area KA, 16 need of control module carry out data-switching, just the gray level of the coordinate points of the prohibited area KA the picture information that provides from host PC 110 are made into " 0 ".By this data-switching, even drive-pulse generator 35 accurately produces driving pulse according to the data that data-switching obtained, when laser irradiating position does not send the writing level laser beam during by this prohibited area KA yet, so, can not form visible image at prohibited area KA.

When the laser that is used to form visible image stops to shine this prohibited area KA, can obtain following effect.When carrying out imaging synchronously with the clock signal that receives from PLL circuit 33, the rotating speed that spindle motor rotates a circle can change a little, and correspondingly, can be fluctuateed by the cycle of the clock signal of PLL circuit 33 outputs.Because fluctuation as the clock signal of imaging synchronizing signal, situation may be that the track (shown in the dotted line of Fig. 3) of (as shown in figure 31) laser irradiating position can throw a circle basically at the laser beam irradiation that forms visible image after reference position KK begins, and can give off laser beam at the position KT of laser beam by the reference position, simultaneously, this laser beam can be sent and be used to show the image that follows KC place, position afterwards, reference position closely.That is to say that laser beam takes place superimposed when sending, cause sending equally and should sending the laser beam that is used to show KC place, eve position, reference position image giving off laser beam in order to the KT place, position in the formation visible image zone.So so the visible image that obtains can produce failure.Therefore, even when the clock signal fluctuation that PLL circuit 33 produces, also can the transition diagram image information, so that prohibited area KA to be set, thereby can prevent to cause failure owing to use laser beam to form second visible image in same position.

(remodeling 10)

Can adopt optical disc recording apparatus 100 with structure shown in Figure 32 ' the substitute optical disc recording apparatus 100 of the foregoing description.Shown in figure 32, optical disc recording apparatus 100 ' be that with the difference of the foregoing description optical disc recording apparatus 100 it does not comprise FIFO storer 34 and drive-pulse generator 35, and be provided with scrambler 320 and come place of encoder 17.

Scrambler 17 among scrambler 320 and the described embodiment all is to be used for the data that receive are carried out EFM modulation and CIRC (Cross Interleave Reed-Solomon Code) conversion.Scrambler 320 is temporarily accumulated the reception data in the storer, to the accumulation data carry out above-mentioned modulation, and with the gained data export to strategy circuit 18 '.In addition, according to the modulation On/Off signal that receives from control module 16, the data that scrambler 320 judgements receive from the buffering storer are still should not carry out EFM and to modulate and export by such as the output of EFM modulated process.36 pairs of data that receive from buffering storer 36 of control module 16, scrambler are carried out the EFM modulation, and with the gained data export to strategy circuit 18 '.When control module 16 transmits the modulation shutdown signal, synchronous with the clock signal that receives from PLL circuit 33, scrambler 320 will not carry out any modulation from the data that buffering storer 36 receives and just exported.

After receiving the instruction of user by the input of user interface (not shown), control module 16 is to scrambler 320 output modulation On/Off signals.Specifically, when receiving the instruction that forms visible image on the temperature-sensitive surface from the user, control module 16 output modulation shutdown signals, perhaps when receiving record data to the instruction of recording surface, output modulation start signal.Substitute the instruction output modulation On/Off signal according to the user, control module 16 can be according to export modulation On/Off signal towards the optical disc surface of light picker 10.In the case, when the temperature-sensitive surface of CD D being arranged to make it during towards light picker 10, must output modulation shutdown signal, and when the recording surface of CD D being arranged to make it during towards light picker 10, must export to modulate and open signal.

Adopt this structure, when the user sent record data to the instruction of recording surface, control module 16 was to scrambler 320 output modulation start signal.Transmit the data that write to CD D recording surface to be recorded from host PC 110 to memory buffer 36, and then it is sent to scrambler 320 from buffering storer 36.After receiving the modulation start signal, 320 pairs of scramblers carry out the EFM modulation from the data that write that buffering storer 36 receives, and with the gained result export to strategy circuit 18 '.The time axle of strategy circuit 18 ' carry out EFM modulating data is proofreaied and correct, and produces the driving pulse that is used for driving laser driver 19, and exports this driving pulse to laser driver 19.According to this driving pulse, laser driver 19 provides drive current to laser diode 53 (see figure 3)s of light picker 10, and light picker 10 data from record to the recording surface of CD D that give off laser beam and provide from host PC 110 with.

When the user was emitted in the instruction that forms visible image on the temperature-sensitive surface, control module 16 was to scrambler 320 output modulation shutdown signals.Transmit and the corresponding picture information of the lip-deep visible image of the temperature-sensitive in CD D to be formed to memory buffer 36 from host PC 110, then it is sent to the internal storage of scrambler 320 from buffering storer 36.After receiving the modulation shutdown signal, scrambler 320 does not carry out any modulation for the picture information that receives from buffering storer 36, but also the clock signal that provides with PLL circuit 33 is synchronous, successively the data (information of indication gray level) of each coordinate points are exported to strategy circuit 18 '.Strategy circuit 18 ' and the foregoing description in drive-pulse generator 35 produce driving pulse according to the data of each the coordinate points gray level of indication that provides successively, then driving pulse is exported to laser driver 19.According to this driving pulse, laser driver 19 provides drive current to laser diode 53 (see figure 3)s of light picker 10, and light picker 10 gives off laser beam, to form and the consistent visible image of host PC 110 picture information that transmitted on the temperature-sensitive surface of CD D.

As mentioned above, because scrambler 320 can carry out or stop modulation according to visible image formation or data recording, so can remove and only be used for FIFO storer 34 and the drive-pulse generator 35 that visible image forms, and, by this simple structure, optical disc recording apparatus 100 ' can obtain visible image to form function and data recording function.

(remodeling 11)

Also can go up and form visible image at the recording surface (recording layer 202) of CD D.Owing to well-knownly be, when sending the laser beam that is equal to or greater than predetermined light intensity to recording layer 202, can change the reflectivity at irradiation position place, so, can by send can visual recognition laser beam in a big way form visible image.Perhaps, when recording layer 202 is when being made by the material of its state variation, for example the laser radiation zone is hollowed out or is made it projection, also can utilize this properties of materials to form visible image.

Form visible image for going up at recording surface (recording layer 202), the guide channel (pre-groove) that only needs to form in recording layer 202 is write down in order to form the data of visible image.In addition, the same when forming visible image with (photosensitive layer 205) is last on the temperature-sensitive surface, can increase the beam spot diameter, that is given off laser beam to recording layer 202, and can not adopt guide channel to come record data.That is to say that the interval of guide channel (track pitch) is the very little value of having only several microns, and, even do not carrying out under the situation of data recording, also can not reduce the resolution of visible image to be formed along guide channel.Strictly speaking, the surface ratio of recording layer 205 is more coarse, because guide channel is formed at wherein; Yet, because the degree of depth of guide channel be several microns a very little value only, so, when the formation visible image, can think that recording layer 202 is smooth.

As long as adopt relevant odd number of the present invention, just not only on the temperature-sensitive surface (photosensitive layer 205) also can be gone up the formation visible image at recording surface (recording layer 202), and need not any isolated plant.

(remodeling 12)

When forming visible image on the recording layer 202 at CD D, nature can not be recorded in data the zone that is loaded with visible image.So, CD D write zone (recording layer 202), can pre-determine the zone that is used to form visible image.For example, when to the zone that extend precalculated position (address), carrying out original data record, and when externally the zone forms visible image, can not lose the original data record zone from the interior position of CD.

In addition, can after finishing original data record, detect wherein as yet the not zone of record data, and can form visible image at detected not posting field.

(remodeling 13)

Can be stored in advance in the storer (not shown) of optical disc recording apparatus 100 in order to the data (picture information) that form visible image to be recorded.For example, in storer, form, be recorded in data on the CD D as visible image wherein with numeral 0 to 9.When the user specifies a numeral to go up to be formed on CD D, can from described storer, read the corresponding data that write, and it is recorded on the CD D, to form visible image.

In addition, outwards carry out the data recording of rule along CD, and when finishing data recording, can produce indication record data and the time tag information of time automatically, need not user instruction as visible image.Time tag information can be provided to optical disc recording apparatus 100 from external unit (host PC 110).

In addition, after finishing original data record, can produce indication user name and the signature information that writes data content, as visible image.By user's operation, only needing is provided signature information to optical disc recording apparatus 100 by host PC 110.Perhaps, the user can import (registration) signature information by direct control optical disc recording apparatus 100.

As mentioned above, according to the present invention, not only can be with the recording surface of data recording to CD, and visual data can be recorded to the temperature-sensitive surface, and need not to be provided with separately new equipment.

Claims

1. optical disc apparatus, in order to by laser beam irradiation is come recorded information on CD, it comprises:

Pick-up is used for laser beam irradiation at CD, described CD have an optical recording side and with the temperature-sensitive side of this optical recording side thereof opposite;

Sweep test is used for respect to the CD scanning laser beam;

The record controls part, when CD being arranged to expose its optical recording side, this recording control part divides work, in order to control described pick-up and sweep test, so that realize information is recorded on the described optical recording side by irradiation and scanning laser beam;

The projection control section, when CD being arranged to expose its temperature-sensitive side, this projection control section work, in order to control described pick-up and sweep test according to picture information, thereby realize visible image is incident upon on the temperature-sensitive side of CD, the laser beam that is radiated on the temperature-sensitive side is changed between first light intensity that can not work to CD temperature-sensitive side and second light intensity that can work to CD temperature-sensitive side; And

Servo segment has under the first light intensity situation in laser beam and periodically to detect the laser beam of returning from described CD reflection, and according to the detection to laser beam, in projection visible image process servocontrol is carried out in the irradiation of laser beam;

Wherein, described projection control section is controlled pick-up, in order to keep in second light intensity under the situation of preset time, forcibly laser beam is changed to first light intensity from second light intensity according to picture information, thereby make described servo segment can detect laser beam, to proceed servocontrol with first light intensity.

2. optical disc apparatus as claimed in claim 1, wherein, described projection control section is controlled pick-up, in order to keep surpassing under the situation of preset time in first light intensity, forcibly laser beam is changed to second light intensity from first light intensity according to picture information, thereby make servo segment can detect laser beam, additionally laser beam is carried out servocontrol with second light intensity.

3. optical disc apparatus as claimed in claim 1, wherein, described servo segment is controlled pick-up, the detection with first intensity laser bundle is regulated second light intensity of laser beam with basis.