CN100428336C - Optical disk recorder and control device for optical disk capable of recording volume label surface - Google Patents

Abstract

The invention is a CD-ROM recorder and control device applied to CD-ROM disc with recordable volume label surface, which is a process for describing a volume label surface on the CD-ROM disc with recordable volume label surface by using the device, wherein the device comprises a digital signal processor capable of outputting a focusing servo control signal, and the focusing servo control signal comprises a compensation voltage; a digital/analog signal converter for converting the focus servo control signal into an analog output signal; a low pass filter for receiving the analog output signal and removing a high frequency portion of the analog output signal; a driving circuit for receiving and amplifying the analog output signal from which the high frequency part is removed; and an actuator of the optical pickup head for controlling a lens according to the analog output signal with the high frequency portion removed after the amplification by the driving circuit.

Description

Optical disc recorder and control device applied to optical discs with recordable label surface

technical field

The present invention relates to an optical disc recorder and a control device applied to a burnable label-side optical disc, in particular to an optical disc recorder for tracing the label surface of a recordable label-side optical disc. Control unit for the read/write head.

Background technique

As far as the current computer industry is concerned, having a CD recorder that can back up a large amount of computer data has become an indispensable basic computer equipment. For users who often use a CD recorder for data backup, after backing up important data on a rewritable CD with a predetermined appearance, they often feel that the back of the CD is monotonous and does not have a special pattern. It cannot properly represent the data that has been burned and backed up by oneself; the traditional method is to use a marker pen or a special pen for CDs to directly indicate the name of the backed up data on the back of the CD; however, even if it uses the current market Some printers on the market that can be used to print labels on the back of optical discs print patterns or characters designated by users to represent their file data. It may also be because the weight distribution of the printing paper is uneven, or the printed paper is in the The back of the optical disc is not firmly pasted, and it may fall off and jam the optical drive, causing difficulties in reading operation.

Therefore, some manufacturers of optical discs currently on the market have developed a special dye layer coated on the back (or label surface) of ordinary optical discs to form a recordable label surface optical disc (hereinafter referred to as special discs). The optical head of the optical disc recorder is used to paint the pattern or text on the label surface of the special optical disc. The graphics and text drawing technology on the label side of this special optical disc refers to writing data into the data layer (Data Layer) on the special optical disc, and then turning it over and putting it back into the original optical disc recorder, and the data layer The label side on the back side faces an optical read-write head for data writing in the optical disc recorder, so that the laser beam emitted by the same optical read-write head is used to irradiate the special dye layer on the label surface , so that the layer can produce a chemical reaction to display the pattern or text that the user wants; however, the current limitation of this technology is that it can only draw serigraphy or grayscale patterns on the special dye layer, that is, only Use the different shades of a single color system to present the style of the pattern.

Please refer to FIG. 1( a ), which is a schematic view of the label side of a special optical disc 100 . Based on the above, it can be seen that there is a special dye layer on the label surface that can display graphics and text, and this kind of graphics and text drawing technology on the label surface of the optical disc can directly turn the disc over after the data is written. Put it back into the original optical drive (not shown in this figure), and use the same optical read-write head to draw the label surface. Since there is no groove (groove) on the data surface on the label surface of this special optical disk 100, in order to be able to locate on the label surface, as shown in this figure, on the inner ring of this special optical disk 100 Just be provided with 400 spokes (spokes) mark that exist in the form of equiangularity, and just be provided with a spoke decoding device inside this CD-ROM drive that can support this kind of drawing technology, in order to control the position of the rotation angle of the special CD. The optical pick-up head uses the stepping motor in the optical drive to move radially, so the radial position control is performed by the stepping motor. Therefore, the use of the spoke decoding device and the stepping motor can provide the positioning of the relative position on the special optical disc when the optical read-write head draws on the label surface.

Its 400 spoke marks are respectively distributed in four quadrants on the special optical disc 100 in units of 100, which can be distinguished by spokes S0, S100, S200 and S300, which are defined as spokes S0 to spokes in turn. S399. When the optical read-write head draws on the label surface, its track is composed of multiple concentric circles. Therefore, when the host (Host) transmits the drawing data, it sends out the track and the spoke as a unit. According to the track and spoke information, the drawing data to be written in a specific position on the special optical disc can be known. As shown in Figure 1(a), the first track T1 and the second track T2, so that the nth track Tn after that, and the way of writing from the spoke S0 to the spoke S399, sequentially draw the data that needs to be drawn for each track made.

The above method is the method for the optical disc recorder to locate any position on the label surface of the special optical disc. However, the focus control is also a very important part in the drawing process of the CD recorder. Generally speaking, the data surface of the optical disc has a good reflective ability, so the Focusing Servo System (Focusing Servo System) is used for closed-loop control, so that the optical drive can control the lens (Lens) on the optical read-write head to focus the laser beam The focus is on the data surface. However, the focus control of the label surface of the special optical disc cannot use closed-loop control, and must use open-loop control. Therefore, before the CD recorder starts to draw the label surface, it must execute a learning step (Learning Step) to learn the relationship between the vertical deflection amplitude and the rotation angle of the CD when the CD is rotating. That is, when a special disc is inserted into the disc recorder, the disc will start to spin. Before starting to draw, the optical read-write head will emit a laser beam with low power on the label surface of the special optical disc, which is used to determine the control method of the lens (Lens) on the optical read-write head according to the reflection situation and The control method is recorded in a memory, and this step is the learning step. That is to say, after the learning steps are completed, the optical disc recorder clearly knows the relationship between the spoke and the vertical yaw of the optical disc, and obtains an offset voltage (Offset Voltage), which is used to superpose (Superpose) on the focus servo control signal ( Focusservo control Signal).

As shown in FIG. 1( b ), it is a schematic diagram of the relationship between the amplitude of the up and down deflection obtained by the disc recorder after the learning step and the spokes. In Fig. 1(b), the unit of the horizontal axis is the spoke, and the vertical axis is the amplitude of the up and down deflection of the optical disc, that is, after the learning step is completed, the optical disc burner can determine each specific spoke of the special optical disc 100 Above, the distance relationship between the lens of the optical read-write head and the optical disc. As shown in Figure 1(b) as an example, when Sa, Sb, Sc, Sd, and Se of the spokes are the special optical disk 100 deflection, the focal point of the lens is just on the special optical disk 100, and the optical disk between Sa and Sb The yaw will be close to the lens, while the yaw of Sb and Sc discs will be away from the lens, and so on. Using the above relationship, the optical disc recorder must generate a compensation voltage to control the lens of the optical read-write head, so that in actual drawing, an equidistant distance can be maintained between each specific spoke lens and the optical disc, that is, the lens can be adjusted at any time. It moves up and down according to the up and down deflection of the optical disc, so that the color of the pattern formed on the label surface is uniform.

Please refer to FIG. 1( c ), which is a functional block diagram of an optical drive 10 . The optical drive 10 can perform the above-mentioned graphic drawing technique on the label surface of the special optical disc 100 . As shown in this figure, it can be seen that the inside of the optical drive 10 mainly has a digital signal processor 11, a digital/analog signal converter 12, a driving circuit (Power Drive) 13 and an actuator in an optical read-write head ( Actuator) 14. Generally, when the optical drive 10 draws a label surface, the digital signal processor 11 generates a focus servo control signal. Since the optical drive 10 has completed the learning step, the focus servo control signal will also include offset voltage. However, since the output signal of the digital signal processor 11 is in digital form, the digital/analog signal converter 12 converts the focus servo control signal output by the digital signal processor 11 into an analog output signal. After the analog output signal is amplified by the driving circuit 13, it can control the actuator 14 in the optical pick-up head to move the lens in the optical pick-up head.

Please refer to FIG. 1( d ), which shows a schematic diagram of an analog output signal output by the digital/analog signal converter 12 . Since the focus servo control signal includes offset voltage, it is used to control the distance between the lens and the optical disc. Therefore, the analog output signal of the digital/analog signal converter 12 will continuously produce voltage changes ranging from high to low. As is well known, the digital/analog signal converter 12 uses multiple voltage levels to approximate the actual analog signal. Therefore, an analog output signal output by the digital/analog signal converter 12 actually oscillates between different voltage levels. Further observation of this signal shows that in order to quickly jump from one voltage level to another voltage level, a high frequency will be generated when the analog output signal jumps from one voltage level to the other. After the oscillation phenomenon, it will reach another voltage level. After the above analog output signal is amplified by the driving circuit 13, it will cause the actuator 14 of the optical pickup head to produce regular mechanical vibrations.

Please refer to FIG. 1( e ), which is a schematic view showing that the label surface of the special optical disc 100 is drawn when the actuator 14 of the optical pickup produces regular mechanical vibrations. From the foregoing, it can be known that the actuator 14 of the optical read-write head oscillates regularly, causing the lens to oscillate near the focal point, so that the marking surface of the special optical disc 100 will produce regular patterns of depth and depth at different angles. As a result, there are obvious gaps between dark and light contrasts. This phenomenon will be particularly noticeable when drawing with the same color scale, leaving easily observable defects on the finished label surface. As shown in Fig. 1(e), we describe part of the label surface of the special optical disc 100 in the same color scale. However, as shown in this figure, it can be found that the label surface appears There are certain rules, and there are obvious deep and shallow interval stripes. For example, in each small area surrounded by the dotted line in the figure, the color gradation presented is relatively dark. However, in the dotted line range and the area between the dotted line range, that is, the gap between the left and right sides of each small area, the color gradation it presents is relatively lighter.

How to propose a method that can effectively solve the problems in the drawing process of the graphics and text drawing technology on the volume label surface of the optical disc, so that the overall graphics and text marks drawn can be more beautiful, has become the main purpose of the present invention.

Contents of the invention

The object of the present invention is to provide an optical disc recorder and a control device applied to an optical disc with a recordable label surface.

In order to achieve the above object, the optical disc recorder provided by the present invention is applied to a label surface that can be used for drawing on an optical disc, and the optical disc recorder includes:

A digital signal processor capable of outputting a focus servo control signal, and the focus servo control signal includes a compensation voltage;

a digital/analog signal converter connected to the digital signal processor for converting the focus servo control signal into an analog output signal;

a low-pass filter connected to the digital/analog signal converter for receiving the analog output signal and removing a high-frequency portion of the analog output signal;

a driving circuit, connected to the low-pass filter, for receiving and amplifying the analog output signal with the high-frequency part removed; and

An actuator of an optical read-write head is connected to the drive circuit and is used to control a lens according to the analog output signal amplified by the drive circuit and the high-frequency part removed.

Said optical disc recorder, wherein the low-pass filter is an analog low-pass filter.

The optical disc recorder provided by the present invention is applied to a volume label that can be used for drawing on an optical disc, and the optical disc recorder includes:

A digital signal processor capable of outputting a focus servo control signal, and the focus servo control signal includes a compensation voltage;

a digital low-pass filter, connected to the digital signal processor, for receiving the focus servo control signal and removing a high frequency part of the focus servo control signal;

A digital/analog signal converter, connected to the digital low-pass filter, is used to receive the focus servo control signal output by the digital low-pass filter and remove the high-frequency part, and generate an analog output signal;

a drive circuit, connected to the digital/analog signal converter, for receiving and amplifying the analog output signal; and

An actuator of an optical read-write head is connected to the drive circuit and is used to control a lens according to the amplified analog output signal of the drive circuit.

According to the present invention, the characteristic of high-frequency noise can be eliminated by using the low-pass filter, so that when drawing a special optical disk, the actuator of the optical read-write head will not cause regular vibration when controlling the lens due to the conversion of the voltage Therefore, the distance between the lens and the special optical disc is kept constant, which can avoid the obvious defects of deep and shallow space stripes as described in the prior art when drawing.

Description of drawings

Fig. 1(a) is a schematic diagram of the label side of a special optical disc.

FIG. 1( b ) is a schematic diagram of the relationship between the amplitude of the up and down deflection and the spokes obtained by the disc recorder after a learning step.

FIG. 1(c) is a schematic functional block diagram of a conventional optical drive.

Fig. 1(d) shows a schematic diagram of an analog output signal output by a digital/analog signal converter.

FIG. 1( e ) is a schematic view showing the finished drawing of the label surface of a known special optical disc.

Fig. 2(a) is a schematic diagram of the label side of the special optical disc.

FIG. 2( b ) is a schematic functional block diagram of the optical drive of the present invention.

FIG. 2(c), which shows a schematic diagram of an analog output signal output by a low-pass filter.

Detailed ways

The present invention is described in detail in conjunction with the embodiments of the accompanying drawings, so as to have a deeper understanding of the present invention.

Please refer to Figure 2(a) and Figure 2(b) together. In FIG. 2( a ), it is a schematic diagram of the label surface of a special optical disc 200 ; and in FIG. 2( b ), it is a schematic functional block diagram of the optical disc drive 20 of the present invention. In the preferred embodiment of the present invention, we use the special optical disc 200 to represent the optical disc in the present invention, and use the optical drive 20 to represent the optical disc recorder of the present invention. The special optical disc 200 is as described in the prior art, except that it has a data surface that can be used for data writing and burning, and the reverse side of its data surface can be used to support the optical drive 20 to carry out the graphics and text drawing technology on the back of the optical disc. label side.

In a preferred embodiment of the present invention, the label surface of the special optical disc 200 also has a special dye layer that can draw serigraphy or grayscale patterns, and also has spoke marks for positioning. In addition, as shown in Fig. 2 (b), it can be seen that the inside of the optical drive 20 mainly includes: a digital signal processor 21, a digital/analog signal converter 22, a driving circuit 23, an actuation of an optical read-write head device 24 and a low pass filter 25 (low pass filter); as shown in this figure, it is different from Fig. 1 (c) in the prior art in that a low pass is added in the optical drive 20 of the present invention Filter 25, and the setting of the low-pass filter 25 is arranged between the digital/analog signal converter 22 and the driving circuit 23, and is simultaneously signal-connected between the digital/analog signal converter 22 and the driving circuit twenty three.

As mentioned above, in this preferred embodiment, before the optical disc drive 20 draws the label surface of the special optical disc 200, it will also first carry out the learning steps (learning) on the label surface as described in the prior art. step) to detect the vertical yaw condition of the special optical disc 200 .

When the learning step is completed, the representative begins to draw the label surface of the special optical disc 200, and the lens (not shown in this figure) of the optical pick-up head can maintain the distance between the lens and the special optical disc 200 through the control of the actuator. distance between. Therefore, the focus servo control signal output by the digital signal processor 21 also includes the compensation voltage. However, since the digital/analog signal converter 22 will generate a stepped analog output signal, and generate a high-frequency oscillation phenomenon at the initial stage of each voltage level.

In view of the above defects, the present invention adds a low-pass filter 25 between the digital/analog signal converter 22 and the driving circuit 23 to eliminate the high-frequency part of the analog output signal. Therefore, as shown in Figure 2(c), when the high frequency part of the analog output signal is removed, the signal will be smoother. After being amplified by the drive circuit 23, the regular oscillation phenomenon of the actuator 24 of the optical pickup will be reduced. That is to say, the lens of the optical pickup will not The focus of the special optical disc can be irradiated on the label surface of the special optical disc 200, so that the pattern of regular depth and light produced after the known special optical disc label surface is drawn will disappear.

Furthermore, the removal of the high-frequency portion of the focus servo control signal can also be implemented by means of digital signal processing. For example, a digital low-pass filter can be inserted between the digital signal processor 11 and the digital/analog signal converter 12 in FIG. 1(c) to achieve analog low-pass filtering in FIG. 2(b). The effect of device 25. The digital low-pass filter can further improve the resolution of the focus servo control signal output by the digital signal processor. For example, a plurality of sub-levels are provided between the two voltage levels of the focus servo control signal, and when the digital/analog signal converter converts it into an analog output signal, the analog output signal can be smoother, and the high-frequency part can also be reduction, thereby reducing the regular oscillation phenomenon of the actuator of the optical read-write head, and then achieving the problem to be solved by the present invention.

Therefore, it can be seen from the above that, by the invention of the present invention, the low-pass filter 25 can be used to eliminate high-frequency noise, so that when the special optical disc 200 is drawn, the optical reading will not be caused by the conversion of the voltage. The problem that the actuator 24 of the write head produces regular vibrations when controlling the lens, thereby maintaining a fixed distance between the lens and the special optical disc 200, can avoid producing obvious deep and shallow interval stripes as described in the prior art when drawing flaw. Therefore, can successfully solve the problem as described in the prior art, and have reached the main purpose of the present invention development, but the present invention can be modified in various ways by those who are familiar with this art, but none of them can Get rid of the content protected by the appended claims.

Claims (2)

1. A CD recorder, which is applied to the volume label surface on a CD, and the CD recorder includes: A digital signal processor capable of outputting a focus servo control signal, and the focus servo control signal includes a compensation voltage; a digital/analog signal converter connected to the digital signal processor for converting the focus servo control signal into an analog output signal; an analog low-pass filter, connected to the digital/analog signal converter, for receiving the analog output signal and removing a high-frequency portion of the analog output signal; a driving circuit, connected to the analog low-pass filter, for receiving and amplifying the analog output signal with the high frequency part removed; and An actuator of an optical read-write head is connected to the drive circuit and is used to control a lens according to the analog output signal amplified by the drive circuit and the high-frequency part removed. 2. A CD recorder, which is applied to the volume label surface on a CD, and the CD recorder includes: A digital signal processor capable of outputting a focus servo control signal, and the focus servo control signal includes a compensation voltage; a digital low-pass filter, connected to the digital signal processor, for receiving the focus servo control signal and removing a high frequency part of the focus servo control signal; A digital/analog signal converter, connected to the digital low-pass filter, is used to receive the focus servo control signal output by the digital low-pass filter and remove the high-frequency part, and generate an analog output signal; a drive circuit, connected to the digital/analog signal converter, for receiving and amplifying the analog output signal; and An actuator of an optical read-write head is connected to the drive circuit and is used to control a lens according to the amplified analog output signal of the drive circuit.

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