JP4166630B2 - Optical information recording apparatus and optical information reproducing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical information recording apparatus for recording information on a flexible sheet-like optical disk, and an optical information reproducing apparatus for reproducing information on the optical disk.
[0002]
[Prior art]
In recent years, there has been a demand for optical discs to record large volumes of digital data, such as the start of digitization of television broadcasts. Of the methods for increasing the density of optical discs, the basic method is to reduce the spot diameter of light used for recording / reproduction.
[0003]
For this reason, it is effective to shorten the wavelength of light used for recording / reproduction and to increase the numerical aperture NA of the objective lens. As for the wavelength of light, a wavelength of near infrared light of 780 nm is used for CD (compact disk), and a wavelength of 650 nm of red light is used for DVD (digital versatile disk). Recently, a blue-violet semiconductor laser has been developed, and it is expected that a laser beam of around 400 nm will be used in the future.
[0004]
As for the objective lens, it was less than NA0.5 for CD, but it is about NA0.6 for DVD. In the future, it is required to further increase the numerical aperture (NA) to NA or more 0.7. However, increasing the NA of the objective lens and shortening the wavelength of light also increase the influence of aberrations when focusing light. Therefore, the margin for the tilt of the optical disk is reduced. Further, since the depth of focus is reduced by increasing the NA, the focus servo accuracy must be increased.
[0005]
Furthermore, since the distance between the objective lens and the recording surface of the optical disk is reduced by using a high NA objective lens, it is necessary to reduce the surface blur of the optical disk immediately before pulling in the focus servo at the start. The objective lens and the optical disk may collide, causing a pickup failure.
[0006]
As a short-wavelength, high-NA high-capacity optical disk, for example, as described in Non-Patent Document 1, a recording film is formed on a substrate that is as thick as a CD and has high rigidity, and is used for recording / reproducing light. Has been proposed which records / reproduces data on / from a recording film through a thin cover layer without passing through the substrate.
[0007]
Patent Documents 1 to 5 describe a configuration in which a flexible optical disk is rotated to face a stabilizing member in order to stabilize surface blurring in the optical disk by utilizing aerodynamic action force according to Bernoulli's law. There is a description of the recording / reproducing apparatus or the structure of a flexible optical disc.
[0008]
[Patent Document 1]
JP-A-7-105657
[Patent Document 2]
Japanese Patent Laid-Open No. 10-308059
[Patent Document 3]
US Patent Application Publication No. 2002/0186636
[Patent Document 4]
JP 2002-269855 A
[Patent Document 5]
JP 2002-358759 A
[Patent Document 6]
JP 2003-22651 A
[Non-Patent Document 1]
O PLUS E Vol. 20, No. 2, P.E. 183 pages
[0009]
[Problems to be solved by the invention]
However, in the conventional technique, when the optical disk substrate is formed of a rigid body, in order to reduce surface deflection and tilt in the rotating optical disk, extremely accurate molding is performed and recording is performed at a low temperature so that thermal deformation does not occur. A film must be deposited. This prolongs the tact time associated with optical disc manufacture and increases costs.
[0010]
Further, in the method of rotating a flexible optical disk on a stabilization plate, as described in Patent Document 2, when rotating on a simple flat plate, the optical disk and the stabilization plate slide in contact with each other, For this reason, the optical disk vibrates and high-frequency surface shake occurs. This surface blur often occurs in a frequency region where mechanical focus servo cannot respond, and the residual servo error cannot be sufficiently suppressed.
[0011]
Further, when the optical disk and the objective lens slide due to surface blurring, dust is generated and the dust or the like causes an error. In particular, as described in Patent Document 1, when the recording film is present on the stabilizing plate side, the recording film of the optical disk is damaged by sliding, and an error is directly caused.
[0012]
Further, the description in Patent Document 1 includes a description in which a raised portion is provided on a flat plate surface for more precise stabilization. However, there is no description of details of the raised portion or details of positive / negative of the generated pressure, and the mechanism of operation is unknown. If the raised part is a simple convex shape, the disk entry side (front edge part) of the surface that stabilizes the disk will be positive pressure, and the rear edge part will be negative pressure. The pushing force is not necessarily generated.
[0013]
The inventor of the present invention has made it possible to perform stable recording and / or reproduction by means of the discretely arranged stabilizing means that suppresses the axial deflection of the optical disk having flexibility by the Bernoulli effect. An application was made for a driving device (see Patent Document 6). In the present invention, the optical pickup has a positive pressure generating portion, which serves as a stabilizing means. However, the stabilization means around the optical pickup is required to have the most accurate surface blur suppression effect, and high accuracy is required for the amount of protrusion of the stabilization means to the disk side.
[0014]
The object of the present invention is to solve the above-mentioned conventional problems, relax the high precision restriction required for the stabilization means on the positive pressure generation side of the optical pickup, and use a flexible sheet-like optical disk to store information. Provided are an optical information recording apparatus and an optical information reproducing apparatus capable of high-density recording and / or reproduction by reliably suppressing surface blurring of the optical disk by aerodynamic force on both sides of the optical disk when writing / reading. There is to do.
[0018]
[Means for Solving the Problems]
To achieve the purpose,Claim1According to the present invention, there is provided a rotational driving means for rotating a flexible sheet-like optical disk, an optical recording means for focusing information on a recording surface of the optical disk to write information, and a rotation of the optical disk. An optical information recording apparatus comprising a stabilizing means for generating a pressure difference of an air flow sometimes based on Bernoulli's law and stabilizing a surface shake in a rotation axis direction of the optical disc, A first stabilizing means for generating a positive pressure on the installation side of the recording means, and a second stabilization means for generating a negative pressure on the side opposite to the installation side of the optical recording means in the optical disc, An air introduction unit is installed on the downstream side in the rotation direction of the optical disc adjacent to the first stabilizing means.And the first stabilizing means and the air introduction portion are provided radially in the radial direction of the optical disc.With this configuration, the efficiency of positive pressure generation can be increased by the air introduction section, and the aerodynamic force that prevents the optical disk from approaching the optical recording means can be increased. The operation of the means is stable and the disc surface shake can be reduced.Furthermore, a stable disc surface blurring suppression action works in an optical disc..
[0020]
  Claim2The invention described in claim1The optical information recording apparatus described above is characterized in that the first stabilizing means is provided on a stabilizing plate that covers the entire surface of the optical disk, and this configuration can suppress the surface shake of the entire optical disk. Further, it is possible to reduce a transient impact such as a collision with the stabilization member of the optical disc, and to prevent the optical disc from sliding with the stabilization member.
[0021]
  Claim3The invention described in claim1In the optical information recording apparatus described above, the second stabilizing means is arranged discretely with respect to the entire surface of the optical disc. With this configuration, surface blurring can be suppressed at appropriate positions on the optical disc. Thus, it is possible to reduce a transient impact such as a collision with the stabilizing member, and to prevent the optical disk from sliding with the stabilizing member.
[0022]
  Claim4The invention described in claim1The optical information recording apparatus according to claim 1, further comprising means for moving the second stabilizing means facing the optical recording means via the optical disc so as to maintain the facing state of the optical recording means. With this configuration, it is possible to ensure that the surface blurring suppression effect by the first and second stabilizing means acts on the recording target portion of the optical disc.
[0023]
  Claim5The invention described in claim 144. The optical information recording apparatus according to claim 1, wherein a distance between the surface of the optical disk and the first stabilizing means is longer than a distance between the surface of the optical disk and the second stabilizing means, and the optical disk. The distance between the surface of the recording medium and the first stabilizing means is set to 10 μm or more. With this configuration, the distance between the recording light incident surface of the optical disk and the first stabilizing means is 10 μm or more in the atmosphere. By making it larger than the size of dust, errors due to scratches can be reduced. Further, since the second stabilizing means operates with a narrower gap than the first stabilizing means, the negative pressure generated in the gap is large (absolute value), and the stabilizing force can be increased, so that the disc surface shake is prevented. Can be small.
[0024]
  Claim6The invention described in claim 15The optical information recording apparatus according to any one of claims 1 to 3, wherein the first stabilizing means and the second stabilizing means are arranged so that their centers of action are shifted from each other. The pressure can be generated in a stable balance with respect to the center point in the optical recording means, and surface blurring can be satisfactorily suppressed.
[0028]
  Claim7According to the present invention, there is provided a rotation driving means for rotating a flexible sheet-like optical disk, an optical reproducing means for reading information by focusing on a recording surface of the optical disk, and a rotation of the optical disk. An optical information reproducing apparatus comprising a stabilizing means for generating a pressure difference of an air flow sometimes based on Bernoulli's law and stabilizing a surface shake in a rotation axis direction of the optical disc. First stabilizing means for generating a positive pressure on the installation side of the reproducing means, and second stabilizing means for generating a negative pressure on the side of the optical disc opposite to the installation side of the optical reproducing means, An air introduction unit is installed on the downstream side in the rotation direction of the optical disc adjacent to the first stabilizing means.And the first stabilizing means and the air introduction portion are provided radially in the radial direction of the optical disc.With this configuration, the efficiency of positive pressure generation can be increased by the air introduction section, and the aerodynamic force that prevents the optical disk from approaching the optical reproducing means can be increased. The operation of the means is stable and the disc surface shake can be reduced.In addition, a stable disc surface blurring suppression action works in the optical disc..
[0030]
  Claim8The invention described in claim7The optical information reproducing apparatus described above is characterized in that the first stabilizing means is provided on a stabilizing plate that covers the entire surface of the optical disk, and this configuration can suppress the surface shake of the entire optical disk. Further, it is possible to reduce a transient impact such as a collision with the stabilization member of the optical disc, and to prevent the optical disc from sliding with the stabilization member.
[0031]
  Claim9The invention described in claim7In the optical information reproducing apparatus described,Since the second stabilizing means is arranged discretely with respect to the entire surface of the optical disk, and this configuration can suppress surface blurring at an appropriate position of the optical disk, such as a collision of the optical disk with a stabilizing member. Transient impact can be reduced, and sliding of the optical disk with the stabilizing member can be prevented.
[0032]
  Claim 10The invention described in claim7The optical information reproducing apparatus according to the present invention is characterized by comprising means for moving the second stabilizing means facing the optical reproducing means via the optical disc so as to maintain the facing state with the optical reproducing means. With this configuration, it is possible to ensure that the surface blurring suppression effect by the first and second stabilizing means acts on the recording target portion of the optical disc.
[0033]
  Claim 11The invention described in claim7~ 105. The optical information reproducing apparatus according to claim 1, wherein the distance between the surface of the optical disk and the first stabilizing means is longer than the distance between the surface of the optical disk and the second stabilizing means, and the surface of the optical disk and the first stabilizing means. The distance from the first stabilizing means is set to 10 μm or more. With this configuration, the distance between the recording light incident surface of the optical disk and the first stabilizing means is 10 μm or more, and the size of dust in the atmosphere. By making it larger, errors due to scratches can be reduced. Further, since the second stabilizing means operates with a narrower gap than the first stabilizing means, the negative pressure generated in the gap is large (absolute value), and the stabilizing force can be increased, so that the disc surface shake is prevented. Can be small.
[0034]
  Claim12The invention described in claim7~ 11The optical information reproducing apparatus according to any one of claims 1 to 3, wherein the first stabilizing means and the second stabilizing means are arranged so that their centers of action are shifted from each other. The pressure can be generated in a stable balance with respect to the center point in the optical reproducing means, and the surface blur can be satisfactorily suppressed.
[0035]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0036]
FIG. 1 is a cross-sectional view of an optical information recording / reproducing apparatus for explaining an embodiment of the present invention, wherein 1 is a flexible sheet-like optical disk, 2 is a spindle motor that rotationally drives the optical disk 1, and 3 Is a disk chucking hub provided on the spindle 4 which is the rotating shaft of the spindle motor 2, 5 is a first pedestal member disposed above the recording surface side of the optical disk 1, and 6 is disposed below the spindle motor 2. The provided second pedestal member 7 moves in the radial direction of the optical disk 1 to focus the light beam on the optical disk 1 and performs optical scanning on the optical disk 1 to perform information recording and / or reproduction processing. And an optical pickup as optical recording means and optical reproducing means.
[0037]
Reference numeral 8 denotes an optical pickup 7 which is movably provided in a groove 9 extending in the radial direction of the optical disc 1 and uses aerodynamic action force according to Bernoulli's law to record / record at least by the optical pickup 7 on the optical disc 1. A main positive pressure guide member 10 that suppresses the disc surface shake near the reproduction target position is a sub positive pressure guide member. The main positive pressure guide member 8 and the sub positive pressure guide member 10 are first stabilizing means. Is provided on the first base member 5 as will be described later.
[0038]
11 is moved in the radial direction of the optical disk 1 so as to face the optical pickup 7 with the optical disk 1 interposed therebetween and maintain the opposed state to the optical pickup 7 by the movement driving means 12 and the movement driving shaft 19. The main positive pressure guide member 8 and the like are main negative pressure guide members that suppress disc surface fluctuations, and 13 is a sub negative pressure guide member that is discretely arranged so as to face the sub positive pressure guide member 10, and is a second stable pressure guide member. The main negative pressure guide member 11 and the sub negative pressure guide member 13 which are the converting means are provided on the second pedestal member 6 as will be described later.
[0039]
2 is a bottom view of the first pedestal member, FIG. 3 is a cross-sectional view of the first pedestal member from A part to B part in FIG. 2, and the first pedestal member 5 covers the entire surface of the optical disc 1. The main positive pressure guide member 8 portion, the sub positive pressure guide member 10 portion, and the optical disc 1 adjacent to the main positive pressure guide member 8 and the sub positive pressure guide member 10 are downstream in the rotation direction. On the side, a plurality of through holes 14 that are air introduction portions are provided radially from the central portion.
[0040]
FIG. 4 is a plan view of the second pedestal member. The second pedestal member 6 covers the entire surface of the optical disc 1 and is connected to the main negative pressure guide member 11 and the main negative pressure guide member 11. A pair of sub-negative pressure guide members 13 are disposed so as to protrude at symmetrical positions on both sides.
[0041]
FIG. 5 is a sectional view showing the optical pickup portion. The optical pickup 7 disposed in the groove 9 of the main positive pressure guide member 8 is driven by a drive shaft 15 driven by seek drive means 16 shown in FIG. During optical scanning of the optical disk 1 in the radial direction, an objective lens 18 that is driven to move in the groove 9 and is driven by an actuator 17 for tracking and tilt correction made of an electromagnetic coil and a magnet is installed.
[0042]
In the optical information recording / reproducing apparatus having the above-described configuration, as shown in FIG. 3, when the optical disk 1 rotates and the air flow is generated accordingly, the auxiliary positive pressure guide member 10 is shaped so as to restrict the air flow. Therefore, the positive pressure increases at the portion surrounded by the dotted circle in the figure. On the downstream side, the distance between the optical disc 1 and the sub positive pressure guide member 10 is rapidly increased. Normally, this results in a negative pressure, but in the present embodiment, a through hole 14 is formed in the first base member 5 and air enters from the outside, so that the negative pressure is suppressed.
[0043]
Further, sub-negative pressure guide members 13 are discretely arranged on the second pedestal member 6 on the opposite surface of the optical disc 1 with respect to the sub-positive pressure guide member 10. It arrange | positions so that the peak vicinity may come to the opposite front of the sub positive pressure guide member 10. FIG. For this reason, the optical disk 1 is always pushed from the sub positive pressure guide member 10 side to the sub negative pressure guide member 13 side. For this reason, since the force in the vertical direction of the optical disk 1 is large, the surface blurring during the disk rotation is extremely small.
[0044]
The main negative pressure guide member 11 moves in the radial direction of the optical disc 1 in synchronization with the seek operation during recording / reproduction of the optical pickup 7 disposed on the main positive pressure guide member 8, and always with the optical pickup 7. It is driven by the movement drive means 12 so that it exists in the part which opposes.
[0045]
As shown in FIG. 5, the optical pickup 7 including the actuator 17 including the objective lens 18 is embedded in the groove 9 of the main positive pressure guide member 8. For this reason, since the optical disk 1 always receives a force in a direction away from the objective lens 18, the risk of collision between the objective lens 18 and the optical disk 1 is reduced, and the objective lens 18 having a small diameter and a short working distance is used. Is possible.
[0046]
Further, the positive pressure portion on the downstream side in the disk rotation direction with respect to the objective lens 18 is formed so as to protrude from the objective lens 18 toward the disk side. By doing in this way, it becomes difficult for the optical disk 1 to collide with the objective lens 18.
[0047]
Further, the first pedestal member 5 provided with the sub positive pressure guide member 10 is formed with a through hole 14 so that air that generates a positive pressure can be introduced from the through hole 14. Compared with a structure in which the member is simply formed as a convex shape on a flat plate, the force generating the positive pressure can be increased.
[0048]
The operation of the sub positive pressure guide member will be described.
[0049]
FIG. 6A shows a case where there is no through hole, and the width of the convex portion of the sub positive pressure guide member 10 ′ of the first pedestal member 5 ′ is 5 mm, the protruding portion is 1 mm, and the optical disc and the optical disc are convex. FIG. 6 (b) shows a configuration example in which the gap with the part is 10 μm, and FIG. 6 (b) shows the same conditions as FIG. 6 (a) except that a 1 mm wide through hole 14 is provided. The structural example of a form is shown.
[0050]
In the configuration example of FIGS. 6A and 6B, the calculation result of the air pressure field is shown in FIG. 7, and in the configuration example in which the through holes 14 of FIG. It can be seen that the pressure field immediately after passing through the convex portion of the auxiliary positive pressure guide member 10 is on the positive pressure side. From this result, the effect of the structure in which the through hole 14 is provided as shown in FIGS.
[0051]
As described above, since the positive pressure guide members 8 and 10 push the optical disc 1 and the negative pressure guide members 11 and 13 act so as to suck the optical disc 1, the optical disc 1 moves toward the negative pressure guide members 11 and 13 side. Rotation was very close, and the surface blur could be suppressed to within 5 μm.
[0052]
The shape of the negative pressure guide members 11 and 13 is as shown in FIG. 3. Actually, the negative pressure guide members 11 and 13 generate a positive pressure on the upstream side in the disk rotation direction, and generate a negative pressure on the downstream side. A part arises. Accordingly, by selecting the conditions, it is possible to eliminate the fact that only the negative pressure is strongly generated and the optical disk 1 and the negative pressure guide members 11 and 13 keep sliding.
[0053]
Further, in the positive pressure guide members 8 and 10 that act to push the optical disk 1, it always follows that (distance between the disk surface and the positive pressure guide member)> (distance between the disk surface and the negative pressure guide member). By doing so, sliding between the positive pressure guide members 8 and 10 and the optical disc 1 can be avoided.
[0054]
FIG. 8 is an enlarged view of a main part including a flexible optical disk used in this embodiment. The optical disk 1 has a guide groove 21 formed on a film to be a disk substrate 20 and a recording film 22 formed thereon. In addition, a transparent protective film 23 is formed thereon. Recording / reproduction is performed by entering and collecting light from the optical pickup 7 through the transparent protective film 23.
[0055]
As described above, the main positive pressure guide member 8 keeps pressing the optical disk 1 in the direction of moving away from the optical disk 1 at the time of disk rotation. ) Is less likely to cause errors due to scratches.
[0056]
The main negative pressure guide member 11 having a small distance between the disc surface and the guide end surface has a central function of suppressing the surface blur of the optical disc 1 having flexibility. If it is wrapped, it is easy to cause scratches. However, as shown in FIG. 8, since the negative pressure side is the disc substrate 20 that is not directly involved in recording / reproduction in the optical disc 1, no signal error occurs even if it is damaged.
[0057]
FIG. 8 shows a state in which the center position AB of the action of the main positive pressure guide member 8 is different from the center position CD of the action of the main negative pressure guide member 11 in this embodiment. That is, the center position is shifted so that the convex leeward side of the main negative pressure guide member 11 comes to the positive pressure generating portion of the main positive pressure guide member 8. By doing so, the optical disc 1 can stably receive a stable force from the top to the bottom in the drawing at the condensing point of the emitted light from the optical pickup 7. Recording / playback.
[0058]
Hereinafter, the embodiment will be described more specifically as examples.
[0059]
An optical disk 1 having the following configuration was prepared. That is, a thin sheet having a diameter of about 120 mm and about 0.1 mm is used as a disk substrate, and a stamper pitch of 0.6 μm and a width of 0.2 μm are formed on a sheet of polyethylene terephthalate having a thickness of 80 μm by thermal transfer. A 3 μm groove was transferred, and then the sheet / Ag reflective layer was formed by sputtering to 120 nm / (ZrO₂-Y₂O_Three) -SiO₂  10nm / Ge5.0In3.0Sb70.0Te22.0mol% 12nm / ZnS-SiO₂  35 nm / Si_ThreeN_Four  Films were formed in the order of 10 nm. This sheet is spin-coated with UV resin and cured by ultraviolet irradiation to form a transparent protective film having a thickness of 5 μm. Further, the recording layer is melted and crystallized with a large-diameter laser beam. This increases the reflectivity.
[0060]
The optical pickup 7 used was equipped with an objective lens 18 having a wavelength of 405 nm and NA of 0.85. The distance between the disk surface and the objective lens 18 was 0.3 mm.
[0061]
Three negative pressure guide members 11 and 13 were used in the same manner as shown in FIGS. The main negative pressure guide member 11 facing the optical pickup 7 has a round bar shape with a diameter of 20 mm and a guide end surface with a radius of 20 mm, and the other two sub negative pressure guide members 13 have a round bar with a diameter of 30 mm. A shape having a guide end surface with a radius of 30 mm was used. Further, with the center of the disk as a reference for the height, the main negative pressure guide member 11 has a protrusion amount of +0.5 mm with the upward direction in FIG. 3 as +, and the sub negative pressure guide member 13 has a protrusion amount of ± 0 mm.
[0062]
All of the positive pressure guide members 8 and 10 were formed on the first base member 5 and protruded 1.5 mm on the flat plate surface. Further, the height of the protruding tip was set to +1.7 mm with the center of the disc as the reference of the height.
[0063]
Then, as shown in FIG. 1, the optical disk 1 having the above-described configuration is chucked on the disk chuck hub 5 of the spindle 4 and then the spindle motor 2 is rotated. When the rotational speed was set to 5000 rpm and the capacitance sensor embedded in the main negative pressure guide member 11 at a radius of 45 mm was examined, the average distance between the optical disc 1 and the main negative pressure guide member 11 was 2.5 μm, and the surface of the optical disc 1 was The PP value of the blur was 3.0 μm.
[0064]
In this state, a rectangular wave having a recording frequency of 6 mW, an erasing power of 2.2 mW, and a reproducing power of 0.2 mW was recorded on the optical disc 1 with a frequency of 30 MHz and a duty of 30%. When C / N was measured, 56 dB was obtained at RBW 30 kHz. The signal envelope was uniform. This indicates that the focus servo is stable, no defocus error occurs, and the stable servo is applied.
[0065]
If the objective lens 18 has an NA of 0.85, the defocus margin of the lens is smaller than that of a conventional compact disk drive device and the like, and the C / N and the above as long as the focus accuracy is not about ± 0.1 μm or less. A stable signal envelope cannot be obtained. Therefore, in the present embodiment, it is shown that stable servo is applied.
[0066]
In a stable state during recording / reproduction, the main positive pressure guide member 8 of the optical pickup 7 is set at a distance of 60 μm from the disk surface.
[0067]
FIG. 9 shows the dust size distribution in a general office environment. Dust is extremely large with a size of about 10 μm or less, but is small when it is about 20 μm. When dust or debris is caught between the guide and the disk, the disk rotates at high speed, and is easily dragged and has a long scratch. Pick-up scratches must be avoided as they can directly lead to signal errors.
[0068]
Therefore, as shown in FIG. 8, the recording film 22 side of the optical disc 1 is set as the installation side of the positive pressure guide members 8 and 10, and a force to push the optical disc 1 is generated. Is preferably set to be 10 μm or more.
[0069]
When the distance between the positive pressure side guide member and the disk increases in this way, the acting force due to the Bernoulli effect decreases, and the surface blurring suppression force decreases, but the negative pressure side guide member installed on the opposite side becomes several μm. By moving close to each other and generating a large Bernoulli force on the negative pressure side, surface blur can be suppressed. Since the negative pressure side guide member is disposed on the disk substrate 20 side, some sliding scratches do not pose a problem.
[0070]
The apparatus of this example was paused on the same recording track in an office environment and continuously driven for 12 hours. As a result, there was no abnormality in the signal, and no sliding scratches were found on the disk reproduction surface.
[0072]
【The invention's effect】
  As explained above, according to the present invention,An air introduction part is installed on the downstream side in the rotation direction of the optical disc adjacent to the first stabilizing means.And the first stabilizing means and the air introduction portion are provided radially in the radial direction of the optical disc.As a result, the efficiency of positive pressure generation can be increased by the air introduction section, and the aerodynamic force that prevents the optical disk from approaching the optical recording means can be increased, so that the operation of the second stabilizing means is stabilized. In addition, the disc surface shake can be further reduced.
[0073]
For this reason, in the optical information recording apparatus and the optical information reproducing apparatus, a high-precision restriction necessary for the stabilizing means on the positive pressure generation side of the optical pickup is relaxed, and a flexible sheet-like optical disk is used. When writing / reading information, it is possible to surely suppress surface deflection of the optical disk by aerodynamic force on both sides of the optical disk, thereby realizing high-density recording and / or reproduction.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of an optical information recording / reproducing apparatus for explaining an embodiment of the present invention.
FIG. 2 is a bottom view of a first pedestal member in the present embodiment.
3 is a cross-sectional view of the first pedestal member in the present embodiment from A part to B part in FIG. 2;
FIG. 4 is a plan view of a second base member in the present embodiment.
FIG. 5 is a sectional view showing an optical pickup portion in the present embodiment.
FIGS. 6A and 6B are diagrams for comparing the operation of the sub positive pressure guide member in the present embodiment, in which FIG. 6A is a configuration diagram when there is no through hole, and FIG.
7 is a diagram showing the result of calculating the air pressure field in the configuration example of FIGS. 6 (a) and 6 (b). FIG.
FIG. 8 is an enlarged view of a main part including a flexible optical disk used in the present embodiment.
FIG. 9 is an explanatory diagram showing the distribution of dust size in a general office environment.
[Explanation of symbols]
1 Optical disc
2 Spindle motor
5 First pedestal member
6 Second pedestal member
7 Optical pickup
8 Main positive pressure guide member
9 groove
10 Sub positive pressure guide member
11 Main negative pressure guide member
12 Movement drive means
13 Sub-negative pressure guide member
14 through holes
15 Drive shaft
16 Seek drive means
18 Objective lens
19 Moving drive shaft
20 disk substrate
22 Recording film

Claims (12)

Based on Bernoulli's law when rotating the optical disk, rotation driving means for rotating a flexible sheet-like optical disk, optical recording means for focusing information on the recording surface of the optical disk and writing information An optical information recording apparatus comprising a stabilizing means for generating a pressure difference of an air flow and stabilizing a surface shake in a rotation axis direction of the optical disc,
A first stabilizing means for generating a positive pressure on the installation side of the optical recording means in the optical disc, and a second stabilization for generating a negative pressure on the side opposite to the installation side of the optical recording means in the optical disc. And an air introducing unit disposed downstream of the optical disc adjacent to the first stabilizing unit in the rotation direction, and the first stabilizing unit and the air introducing unit are disposed on the optical disc. An optical information recording apparatus provided radially in a radial direction . 2. The optical information recording apparatus according to claim 1, wherein the first stabilizing means is disposed on a stabilizing plate that covers the entire surface of the optical disc . Said second stabilizing means, according to claim 1 Symbol mounting optical information recording apparatus is characterized in that the discrete placement relative to the entire surface of the optical disc. 2. The apparatus according to claim 1, further comprising means for moving the second stabilizing means facing the optical recording means via the optical disc so as to maintain the facing state of the optical recording means. The optical information recording apparatus described . The distance between the surface of the optical disk and the first stabilizing means is longer than the distance between the surface of the optical disk and the second stabilizing means, and the surface of the optical disk and the first stabilizing means 5. The optical information recording apparatus according to claim 1 , wherein the distance is set to 10 [mu] m or more . 6. The optical information recording apparatus according to claim 1, wherein the first stabilizing means and the second stabilizing means are arranged with their centers of action shifted from each other . Based on Bernoulli's law when rotating the optical disk, rotation driving means for rotating the sheet-shaped optical disk having flexibility, optical reproducing means for collecting information on the recording surface of the optical disk and reading information An optical information reproducing apparatus comprising a stabilizing means for generating a pressure difference in an air flow and stabilizing a surface shake in a rotation axis direction of the optical disc,
A first stabilizing means for generating a positive pressure on the installation side of the optical reproducing means in the optical disc, and a second stabilization for generating a negative pressure on the opposite side of the optical reproducing means on the installation side of the optical reproducing means. And an air introducing unit disposed downstream of the optical disc adjacent to the first stabilizing unit in the rotation direction, and the first stabilizing unit and the air introducing unit are disposed on the optical disc. light anatomical information reproducing apparatus characterized by providing radially in the radial direction. 8. The optical information reproducing apparatus according to claim 7, wherein the first stabilizing means is installed on a stabilizing plate that covers the entire surface of the optical disk . 8. The optical information reproducing apparatus according to claim 7, wherein the second stabilizing means is discretely arranged on the entire surface of the optical disc . 8. The apparatus according to claim 7, further comprising means for moving the second stabilizing means facing the optical reproducing means via the optical disc so as to maintain the facing state of the optical reproducing means. The optical information reproducing apparatus described. The distance between the surface of the optical disk and the first stabilizing means is longer than the distance between the surface of the optical disk and the second stabilizing means, and the surface of the optical disk and the first stabilizing means The optical information reproducing apparatus according to claim 7, wherein the distance is set to 10 μm or more . 12. The optical information reproducing apparatus according to claim 7, wherein the first stabilizing means and the second stabilizing means are arranged with their centers of action shifted from each other .

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