JP2011060376A - Optical disk cover - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical disk cover, capable of coping with an increased data storage capacity and high-speed data reading of an optical disk, as well as a variety of CD and DVD player types, and to provide a highly productive, low-cost optical disk cover. <P>SOLUTION: A thin optical disk cover 1, having cellulose triacetate as a principal component and being formed of a film 2 of a transparent non-stretched resin, is adhered with a repeelable adhesive to a data read surface of the optical disk in the vicinity of an outer circumference end portion of one side surface thereof, in a manner as to cover the data read surface of the optical disk. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an optical disc cover for protecting a data reading surface of an optical disc such as a compact disc (hereinafter abbreviated as CD) and a digital video disc (hereinafter abbreviated as DVD).

In an optical disk such as a CD or DVD, a transparent resin such as an acrylic resin or a polycarbonate resin is formed on the data reading surface as a protective layer in order to protect the inner data recording layer. However, the surface of the protective layer on the information reading side may be scratched due to long-term use or use in a bad environment, and information may not be read depending on the depth and size of the scratch. Therefore, in order to protect the data reading surface of the optical disc, Patent Document 1 proposes an “optical disc surface protection sheet made of a transparent resin”. In paragraph [0012] of the document, “transparent” is used as the film material. The sheet 14 is a transparent resin film or resin sheet such as cellulose acetate, polycarbonate, polylactic acid, polystyrene (PS), polyethylene terephthalate (PET), polypropylene (PP), PVC, or cellophane. In addition, the transparent sheet 14 is a material that transmits laser light for reading well, and preferably has a refractive index close to that of the transparent substrate of the optical disk 12. The thickness of the transparent sheet 14 is preferably thin, It may be about 100 μm due to strength, pasting performance, etc. This film is good for reading laser light. It is preferably a transparent sheet that is transparent and has a refractive index close to that of the transparent substrate of the optical disk, and the thickness of the transparent sheet is preferably thin, but it may be about 100 μm from the viewpoint of strength, pasting performance, etc. ” Are listed.

Patent Document 2 describes a protective cover for protecting a data reading surface of an optical disc, “the shield is supported by the annular base to receive and cover the reading surface of the optical disc. And a protective cover characterized by including the above.

JP 2002-8268 A JP 2006-501599 A

However, in recent years, optical discs such as CDs and DVDs have increased data storage capacity and storage density, and data reading speed has increased, and data can be read when the materials described in the above documents and the thickness of the sheet or shield are about 100 μm. In addition, in general transparent sheets and films such as polyethylene terephthalate, polypropylene, polystyrene, and PVC described in Document 1, the resin inside the resin is reproduced during reproduction on an optical disk disc player equipped with the resin shield or sheet. There has been a problem that the sound chamber and image disturbance due to light scattering and birefringence caused by the state of the existing crystals cannot be suppressed.
In addition, media players for playing back optical discs are diversified, and devices that do not accept optical discs with the protective sheet disclosed in the above-mentioned document are generated. In addition, in response to the international price decline trend, cost reduction by improving productivity has become indispensable.

An object of the present invention is to provide an optical disc cover that can cope with an increase in data storage capacity and storage density of an optical disc, an increase in data reading speed, and a variety of media player models. Another object of the present invention is to provide an inexpensive optical disc cover with high productivity.

As a result of intensive studies on the above problems, the present inventors have achieved the present invention by adopting the following configuration. That is, the present invention is as follows.
(1) An optical disc cover formed of a film made of a transparent unstretched resin that covers a data reading surface of an optical disc.
(2) The optical disk cover as described in (1) above, wherein the material of the film is mainly composed of cellulose triacetate.
(3) The optical disk cover as described in (1) or (2) above, wherein the film has a thickness of 10 to 60 μm.
(4) The film has a circular outer shape and a diameter smaller than the outer diameter of the optical disk, and a releasable adhesive is applied with a certain width along the vicinity of the entire outer periphery on one side of the film. The optical disc cover according to any one of (1) to (3) above, further comprising an adhesive portion.
(5) The optical disc has a disk shape and has a disc opening formed with a disc inner peripheral edge defining an opening in the center, the data reading surface is formed on one side of the optical disc, and the data reading An outer periphery data non-storage area having a constant width along the outer periphery, an inner periphery data non-storage area having a constant width along the inner periphery, the outer periphery data non-storage area, and the inner periphery data non-storage area. A data storage area is provided in between, and the film has a cover opening formed with an inner peripheral edge of the film that defines an opening having a diameter larger than the diameter of the disk opening and smaller than the inner diameter of the data storage area. The optical disc cover according to any one of (1) to (4), characterized in that:
(6) The optical disc cover according to (4) or (5), wherein the adhesive portion has an outer diameter smaller than that of the film.
(7) The optical disc cover according to any one of (4) to (6), wherein the adhesive portion is formed in a portion corresponding to the outer periphery data non-storage area of the optical disc.
(8) The film according to any one of (5) to (7), wherein a short slit is formed from a part of the inner peripheral edge toward the outer peripheral edge of the film. Optical disc cover.
(9)
A surface of the film on which the adhesive portion is formed is adhered to a releasable paper, and an adhesive that can be re-removed at one end is provided in the vicinity of the outer peripheral edge of the surface opposite to the surface on which the adhesive portion of the film is formed. The coated sheet-like tab is adhered, the other end of the tab is formed to protrude outside the outer peripheral edge of the film, and the tab is opposite to the surface on which the adhesive portion of the film is formed. The optical disk cover according to (7) or (8) above, wherein a re-peelable front cover film having the same shape as the film is adhered on the concentric circle with the film.
(10) The adhesive force between the surface of the film opposite to the surface on which the adhesive portion is formed and the front cover film is smaller than the adhesive force between the film and the data reading surface of the optical disc, and the adhesive portion of the film The adhesive force between the opposite surface of the surface on which the tab is formed and the tab is smaller than the adhesive force between the optical disc cover and the data reading surface of the optical disc, and the adhesive force between the optical disc cover and the releasable paper is The optical disk cover according to (9), wherein the adhesive strength between the surface opposite to the surface on which the adhesive portion of the film is formed and the tab is smaller.
(11) A jig for mounting the optical disc cover according to any one of (5) to (10) on an optical disc, and a columnar protrusion having substantially the same diameter as the disc opening of the optical disc at the center thereof And a cylinder having a mounting portion on which the optical disk can be stably mounted, and a cylinder having substantially the same inner diameter as the outer diameter of the columnar projection and the outer diameter of the cover opening. An optical disk cover mounting jig comprising: a removable cap having a shape portion.
(12) When the optical disk cover according to (9) or (10) is mounted on an optical disk using the optical disk cover mounting jig according to (11), the optical disk cover mounting according to claim 11 The step of placing the jig on a flat plate, the step of removing the cap 33, and inserting the disk opening at the center with the data reading surface of the optical disk up into the protrusion at the center of the optical disk cover mounting jig. 11. The step of bringing the cap into contact with the mounting portion; the step of inserting the cap into the protrusion and bringing it into contact with the data surface of the optical disc; and the surface on which the adhesive portion is formed on the optical disc cover according to claim 9 or 10 downward Inserting the cap into the cap and bringing it into contact with the optical disc surface; pressing the adhesive portion against the optical disc to adhere it; Optical disk cover mounting method characterized by comprising the step of removability Lum and the tabs and the table cover film, the.
(13) An annular outer peripheral wall having an upper surface and a lower surface, a bottom wall extending from the inside of the lower portion of the outer peripheral wall toward the center of the annular outer peripheral wall and defining an annular inner peripheral end, and the upper portion of the outer peripheral wall The film adheres to the lower surface of the outer peripheral wall and / or the lower surface of the bottom wall so as to cover the entire inner side of the annular frame having a plurality of plate-like protrusions extending from the inner side to the center of the outer peripheral wall. The optical disc cover according to any one of (1) to (3), wherein the optical disc cover is formed.
(14) The optical disc has a disc shape and has a disc opening which is an opening in the center, and the data reading surface is formed on one side of the optical disc, and the data reading surface has a constant outer circumference. An outer circumference data non-storage area of a width, an inner circumference data non-storage area of a certain width along the inner circumference, and a data storage area between the outer circumference data non-storage area and the inner circumference data non-storage area, (13), wherein the film includes a cover opening formed with an inner peripheral edge of the film that defines an opening having a diameter larger than the diameter of the disk opening and smaller than the inner diameter of the data storage area. The optical disc cover described.
(15) In the state where the optical disc cover is mounted on the optical disc, the annular inner peripheral end of the bottom wall is formed in a portion corresponding to the outer peripheral data non-storage area of the optical disc. The optical disc cover according to 13) or (14).
(16) The optical disc cover according to any one of (13) to (15) above, wherein a length of the protruding portion is 0.2 mm or more and 2 mm or less.
(17) Any one of the above (13) to (16), wherein the outer peripheral wall upper and lower outer sides are formed in a rounded shape with no corners, and each has an upper rounded portion and a lower rounded portion. Optical disc cover as described in 1.
(18) The film according to (17), wherein the film is bonded to the center side of the outer peripheral wall from the inner peripheral end of the bottom wall round that defines the end of the lower rounded portion of the lower surface of the outer peripheral wall. ) Optical disc cover described in the above.

  According to the present invention (1), since it is formed of a film made of an unstretched resin, it has a large storage capacity of 4.5 GB or more, and can be applied to an optical disk of a high speed reading method of 4 × speed, 8 × speed or more. In addition, the optical disc mounted with the optical disc cover of the present invention can be used without any trouble for various media players such as music, moving images, and game machines.

  According to the present invention (2), unstretched cellulose triacetate used as a transparent film has a high light transmittance and a low birefringence. Therefore, an optical disk equipped with the optical disk cover of the present invention has a high data reading accuracy. .

According to the present invention (3), by setting the thickness of the transparent film to 10 to 60 μm, the data reading accuracy of the optical disk equipped with the optical disk protective cover of the present invention is improved, and the optical disk cover of the present invention is handled. Sex is preserved.

According to the present invention (4), since the film is smaller than the outer diameter of the optical disk, the optical disk with the optical disk cover according to the present invention (4) is inserted into a disk insertion type disk player and then taken out. Since the end of the film first comes in contact with the brush or lid member of the insertion slot of the disc player and pushes them away, the end of the film continues to come out, so the end of the film is less likely to become resistance during removal Can be taken out smoothly. Further, since the releasable adhesive is applied in the vicinity of the outer peripheral edge of the film, the adhesive does not adhere to the data reading surface of the optical disc, and the data reading is not hindered. Furthermore, since the adhesive is re-peelable, no adhesive remains on the optical disc when the disc cover is peeled off for replacement, so the optical disc cover is repeatedly attached to the optical disc. can do.

  According to the present invention (5), when the optical disk with the optical disk cover attached is taken out from the player, the inner peripheral end of the film 2 can be easily taken out without being caught by the disk fixing jig inside the disk player.

According to the present invention (6), when the pressure-sensitive adhesive portion is smaller than the film outer diameter, the pressure-sensitive adhesive does not protrude outside the film when the film is pressed against the optical disk to adhere the pressure-sensitive adhesive. As a result, the optical disk with the optical disk cover mounted thereon is easy to handle because there is no stickiness near the outer edge.

According to the present invention (7), in the optical disc on which the present optical disc cover is mounted, the adhesive does not become an obstacle to the transmission of light, and the adhesive has no influence on the data reading accuracy of the optical disc.

Since the outer diameter of the cover opening is formed larger than the outer diameter of the opening of the optical disc,
When mounted on an optical disc, the optical disc cover is difficult to remove with bare hands because it is difficult for the hand to be applied to the inner peripheral edge of the film. According to the present invention (8), when removing the optical disk cover of the present invention once mounted on the optical disk, the slit portion is hooked on the tip of the nail and then picked or pulled by the fingertip or the adhesive tape is pasted on the slit portion and the other end is attached. The optical disk cover can be easily peeled off from the optical disk starting from the slit portion.

According to the present invention (9), the adhesive portion of the optical disc cover is not adhered to the releasable paper, so that the adhesive portion does not adhere to other objects, and there is no problem. It is easy to carry, and when it is put on the market as a product, handling in the logistics process is improved, and a tab protruding outside the outer peripheral edge of the cover film is provided. Further, when the optical disc cover of the present invention (9) is attached to the optical disc and then peeled off from the optical disc, the peeling operation can be easily performed by picking the tab. In addition, by providing a front cover film, the softness of the film itself is reinforced to prevent wrinkling of the film when the optical disk cover is mounted on the optical disk, and the entire data reading surface of the optical disk is pressed uniformly. In addition, there is an effect that it is possible to prevent dust from adhering to or scratching the optical disc cover of the inventions (7) and (8) before being attached to the optical disc.

According to the present invention (10), the optical disk cover can be easily peeled off from the releasable paper by picking and pulling up the tab protruding outside the outer peripheral edge of the optical disk cover of the present invention (9). After the optical disc cover is mounted on the optical disc, the tab itself and the front cover film can be easily peeled off from the optical disc cover by picking up the tab and pulling it up.

According to the jig of the present invention (11), the optical disk having the opening having a different diameter at the center and the optical disk cover of the present invention are concentrically stacked by the cooperation of the columnar protrusion and the cap having the cylindrical portion. Accordingly, the optical disc cover of the present invention can be properly mounted without protruding from the optical disc.

According to the present invention (12), the optical disk cover of the above (9) or (10) can be easily and surely attached to the optical disk by using the method of the present invention (12).

According to the present invention (13), the optical disk cover of the present invention can be manufactured by adhering the film according to the present invention (1) to (3) to the lower surface instead of the upper surface of the bottom wall of the annular frame. It can be manufactured at low cost. In the case where a film is bonded to the upper surface of the bottom wall, the manufacturing process becomes complicated, so that inexpensive manufacturing is difficult.

According to the present invention (14), when the optical disk with the optical disk cover attached is taken out from the player, the film inner peripheral edge of the film 2 can be smoothly taken out without being caught by the disk fixing jig inside the disk player.

According to the present invention (15), since the bottom wall of the annular frame does not cover the data storage area of the optical disc, the data storage area of the optical disc is not shielded by the bottom wall. It is possible to read.

According to the present invention (16), the optical disk cover can be easily attached to the optical disk by limiting the length of the protrusion of the annular frame.

According to the present invention (17), the optical disk cover according to the present invention (17) is formed in rounded corners on the upper surface and the lower surface of the annular outer peripheral wall when the optical disk fitted with the optical disk cover is taken out from the player. When the mounted optical disk is taken out after being inserted into a disk insertion type disk player, the sliding resistance with the brush or the cover member of the disk insertion opening of the disk player on the annular outer peripheral wall is small so that the optical disk can be removed smoothly. Can do.

According to the present invention (18), when the optical disk fitted with the optical disk cover is inserted into a disk insertion type disk player and then taken out, the annular outer peripheral wall of the optical disk cover 1 of the present invention (18) is first attached to the disk player. Since the end of the film continues to come out after touching and pushing away the brush or lid member of the insertion slot, the force applied to the end of the film is reduced and the optical disc can be smoothly removed, and the disc player Film peeling due to repeated insertion and removal can also be eliminated.

The plane schematic diagram of the optical disk cover of the present invention (8) is shown. The AA arrow line view of FIG. 1 is shown. The back view of the optical disk cover of this invention (8) is shown. The plane schematic diagram of the state which mounted the optical disk cover of the present invention (8) on the optical disk is shown. The BB arrow line view of FIG. 4 is shown. The cross-sectional schematic diagram of the outer periphery edge part vicinity of the optical disk cover of this invention (9) is shown. The plane schematic diagram of the state which mounted | wore with the cap of the optical disk cover mounting jig of this invention (11) is shown. The CC arrow line view of FIG. 7 is shown. The perspective view of a cylindrical cap is shown. The plane schematic diagram of the state which removed the cylindrical cap of the optical disk cover mounting jig of this invention (11) is shown. The HH arrow line view of FIG. 9 is shown. The plane schematic diagram of the optical disk cover of the present invention (13) is shown. The back surface schematic diagram of the optical disk cover of this invention (13) is shown. FIG. 12 is a view taken along the arrow I-I in FIG. 11. The GG arrow line view of FIG. 11 is shown. The EE arrow line view of FIG. 11 is shown. The L section enlarged view of FIG. 11 is shown. The M section enlarged view of FIG. 11 is shown. The FF arrow line view of FIG. 11 is shown.

  One embodiment of the optical disk cover of the present invention will be described below with reference to FIGS. 1 to 18, but the present invention is not limited to this example.

  As shown in FIG. 1, the present optical disc cover 1 is formed of a film 2 made of a transparent unstretched resin. The optical disc cover 1 is mounted so as to cover the data reading surface of an optical disc (CD, DVD, etc.) and is inserted into the disc player in that state, so that the film needs to have good light transmittance. In particular, since these disk players read data stored on the optical disk via the film with a laser beam having a wavelength of 400 nm to 650 nm, it is required that the transparency of those wavelengths is good. Therefore, as the material of the film, cellulose acetate resin is preferable, and unstretched cellulose triacetate is particularly preferable. In general, a resin film is manufactured by stretching a resin in order to increase production efficiency. However, in the stretching process, high molecular weight molecules constituting the resin are oriented, and in some cases, crystallized, and the oriented molecules and crystals are used to transmit light. Refraction and birefringence occur, and in the optical disc cover, data reading accuracy is deteriorated (image reproducibility is poor). However, since the film 2 constituting the optical disc cover 1 is unstretched, it is difficult for molecular orientation and crystallization to occur in the film, so that good data reading accuracy can be obtained.

Moreover, as an unstretched film, the film made by the casting method is preferable with little birefringence.

The thickness of the film 2 used for the optical disc cover 1 is 10 to 60 μm. The film 2 is preferably thin in order to improve light transmittance. However, if the thickness is less than 10 μm, the mechanical strength is insufficient, the function of protecting the data surface of the optical disk 20 is deteriorated, and the film 2 is too soft when the optical disk cover 1 is mounted on the optical disk 20, so that the mounted film 2 is wrinkled and data reading accuracy is reduced.

  The film 2 has a circular shape and has an adhesive portion coated with a removable adhesive in the vicinity of the outer peripheral edge thereof. The adhesive portion allows the entire surface of the film to be in close contact with the optical disc 20, and can be mounted. 1 can be inserted into various disc players (not shown, the same applies hereinafter) and operated without any trouble.

The optical disk cover 1 has a cover opening 9 having an outer diameter larger than the disk opening 21 of the optical disk 20 and smaller than the inner diameter of the data storage area 22 of the optical disk 20 at the center. Since the cover opening 9 is larger than the disk opening 21, the inner peripheral edge of the film 2 is caught by a disk fixing jig inside the disk player when the optical disk 20 with the optical disk cover 1 mounted is taken out from the disk player. Can be easily removed.

When the optical disc with the optical disc cover 1 is taken out from the insertion type disc player, the film 2 is not protruding from the end of the disc, so that it can be easily taken out from the disc player without being caught by the member covering the insertion slot. Can do.

The adhesive part 11 to which the adhesive 3 of the present optical disk cover 1 is applied is inside the outer peripheral edge of the film 2, so that when the adhesive part is pressed against the disk and adhered, the film adhesive 3 The effect of preventing the film from sticking out of the film and adhering to the hand or peripheral device when the optical disk cover 1 is handled is prevented. Further, since the inner end of the adhesive portion 11 is formed in a range that does not overlap the data storage area 22 of the corresponding optical disc 20, the data reading accuracy of the disc player is reduced due to the adhesive 3 entering the data storage area 22. It is configured to prevent it.

  The optical disc cover 1 has a slit 10 formed in a part of the inner peripheral end 13. The slit 10 is formed by a film break or a slight gap. When removing the optical disk cover 1 from the optical disk on which the optical disk cover 1 is mounted, the slit 10 is hooked on the tip of a nail and then picked and pulled by a fingertip, or a part of a commercially available adhesive tape is cut and pasted on the slit 10 once. By pulling the other end with a finger and pulling it, the film 2 can be easily peeled off from the optical disc 20 with the slit 10 as a starting point.

The present invention 9 is devised so that the optical disc cover 1 can be handled without any trouble in the distribution process of the market. As shown in FIG. 6, the present invention 9 has a disc cover 1 made of a film 2 provided with a photoadhesive 3 adhered to a releasable paper 4, and a tab adhesive 6 provided on the outer peripheral end of the optical disc cover 1. The tab 5 is formed by adhering one end and projecting the other end out of the outer peripheral end of the optical disc cover 1, and covering and adhering the tab 5 and the film 2 with a front cover film 7 provided with an adhesive 8.

By being configured in this way, it is possible to prevent the adhesive 3 of the optical disc cover 1 from coming into contact with surrounding objects and hands when the product is handled. Since the tab 5 is provided so as to protrude outside the outer peripheral edge of the film 2, the optical disc cover 1 of the present invention (9) is further removed when the present optical disc cover 1 is peeled off from the releasable paper 4. When the optical disc cover 1 is peeled off from the optical disc 20 after being attached to the optical disc 20, the peeling operation can be easily performed by picking the tab 5. Further, by providing the front cover film 7, it is possible to prevent dust from being attached to the optical disc cover 1 or from being damaged. Further, when the optical disc cover 1 is attached to the optical disc 20, the film 2 itself is prevented from being damaged. The softness is reinforced and the entire data reading surface of the optical disk 20 can be covered and mounted without causing wrinkles on the film 2.

As for this invention (10), the adhesive force of the surface opposite to the surface in which the said adhesion part 11 of the said film 2 was formed, and the said front cover film adhesive 8 is the said film adhesive 3 as shown in FIG. The adhesive strength between the tab adhesive 6 and the surface opposite to the surface on which the adhesive portion of the film 2 is formed is smaller than the adhesive strength with the data reading surface of the optical disc 20. The adhesive strength between the optical disk cover 20 and the releasable paper 4 is smaller than the adhesive strength with the data reading surface, and the adhesive strength between the opposite surface of the film where the adhesive portion is formed and the tab adhesive 6. 1 is an optical disc cover 1 that is smaller than force.

As for this invention (10) which has said structure, since the adhesion part is not exposed outside, it is easy to handle without sticking to a surrounding thing at the time of handling. When mounting the present invention (10) on the optical disc 20, the optical disc cover 1 and the releasable paper 4 are first peeled off by picking up and pulling the tab 5, and then the optical disc cover 1 is adhered to the optical disc 20 and again. When the tab 5 is pulled up, the tab 5 and the front cover film 7 are peeled off from the optical disc cover 1, and the mounting of the optical disc cover 1 on the optical disc 20 is completed.

The present invention (11) is a jig for mounting the optical disk cover 1 according to the present invention 1 to 10 on an optical disk as shown in FIGS. A pedestal 34 having a mounting portion 32 on which the optical disk 20 can be stably mounted, on which a columnar protrusion 31 having substantially the same diameter as the opening 21 is formed, and an inner diameter substantially the same as the outer diameter of the columnar protrusion 31 And a removable cap 33 having a cylindrical portion having an outer diameter substantially the same as the diameter of the cover opening 9.

The present invention (12) uses the optical disc cover mounting jig 30 according to the invention (11), and can be removed from the optical disc cover 1 according to the invention (5) to (8), or the invention (9) or (10). Placing the optical disc cover mounting jig 30 of the invention (11) on a flat plate for mounting the optical disc cover 1 with the paper peeled off on the optical disc 20 so that no wrinkles or undulations occur on the film 2; The step of removing the cylindrical cap 33 and the center disc opening 21 with the data reading surface of the optical disc 20 facing up are inserted into the projection 31 at the center of the optical disc cover mounting jig 30 so as to contact the disc mounting portion 32. The step of contacting, the step of inserting the cylindrical cap 33 into the columnar protrusion 31 and bringing it into contact with the optical disc 20, and the optical disc cover 1 according to the inventions (5) to (8) or The optical disc cover 1 with the releasable paper peeled off from (9) or (10) is inserted into the cylindrical cap 33 with the surface on which the adhesive portion 11 is formed facing downward, and comes into contact with the data surface of the optical disc 20 And a step of pressing and adhering the adhesive portion 11 to the peripheral end portion 23 of the optical disc 20 and a step of pulling up the tab 5 and re-peeling the film 2, the tab 5 and the front cover film 7. An optical disc cover mounting method. By this method, the optical disc cover 1 can be mounted on the concentric circle of the optical disc 20 accurately and without causing wrinkles on the film.

The present invention 13 is an optical disc cover 1 that protects the data reading surface of the optical disc 20 by fitting the optical disc 20 into a frame that adheres and fixes the peripheral edge of the film 2, and is as described below. 11 to FIG. 18, an annular outer peripheral wall 43 having an upper surface 41 and a lower surface 42, and an annular inner peripheral end extending from the inside of the lower portion of the outer peripheral wall toward the center of the annular outer peripheral wall 43. 44 so as to cover the entire inner side of the annular frame 40 including a bottom wall 45 in which 44 is defined and a plurality of flat plate-like protrusions 46 that extend from the inside of the upper part of the outer peripheral wall toward the center of the annular outer peripheral wall 43. The optical disc cover according to any one of the inventions (1) to (3), wherein the film 2 is bonded to the lower surface of the outer peripheral wall 42 and / or the lower surface of the bottom wall 45. That.
The material of the annular frame 40 is a polycarbonate (hereinafter abbreviated as PC) resin, but may be other resins. Other resins preferably have heat resistance and dimensional stability equivalent to or higher than those of the optical disc 20, and further have injection molding properties. Polyacrylate, ABS, polyester (PET, PBT), polyamide, poly Oxymethylene, polyphenylene sulfide, polyether sulfone, and the like may be used.

The present invention (14) is disk-shaped and has a disk opening (21) which is an opening in the center, and a data reading surface is formed on one side of the optical disk 20, and the data reading surface is along the outer periphery. An outer periphery data non-storage area 23 having a constant width, an inner periphery data non-storage area 24 having a constant width along the inner periphery, and a data storage area between the outer periphery data non-storage area 23 and the inner periphery data non-storage area 24 An optical disc cover 1 for protecting a data reading surface of an optical disc 20 provided with an inner circumference in which the film 2 defines an opening having a diameter larger than the diameter of the disc opening 21 and smaller than the inner diameter of the data storage area 22. An optical disc cover 1 is provided with a cover opening 9 formed of an end 14.
Since the cover opening 9 is larger than the disk opening 21, when the optical disk 20 with the optical disk cover 1 mounted is taken out from the disk player, the inner peripheral edge 14 of the film 2 is an optical disk fixing jig (inside the disk player). (Not shown) and can be easily taken out.

According to the present invention (15), the annular inner peripheral end 44 of the bottom wall 45 is formed at a position corresponding to the outer peripheral data non-storage area 20 of the optical disc 20 when the optical disc cover 1 is mounted on the optical disc 20. The optical disc cover 1 is characterized by the above. Since the data storage area 22 of the optical disk 20 is not shielded by adopting the configuration of the present invention (15), a data read failure occurs when the optical disk cover 1 is mounted on the optical disk 20 and applied to the disk player. There is no.

The present invention (16) is the optical disc cover 1 characterized in that the length of the protrusion 46 is not less than 0.2 mm and not more than 2 mm. In the present invention (16), the optical disk 20 is inserted with the data reading surface facing downward from the upper part of FIG. 14 between the bottom wall 45 and the protrusion 46 and is brought into contact with the inner surface of the outer peripheral wall 43. If the protrusion 46 is longer than 2 mm, it is difficult to insert the optical disk 20, and if it is shorter than 0.2 mm, the optical disk 20 mounted on the optical disk cover 1 may be detached during operation in the disk player. Accordingly, in consideration of ease of handling during mounting and the possibility of detachment after mounting, the protrusion 46 is more preferably 0.3 mm to 1 mm.

The present invention (17) is the optical disc cover 1 characterized in that the outer wall outer upper part and lower part are formed in a rounded shape without corners and have an upper round 47 and a lower round 48, respectively. “R” may be described as “R”. Thus formed, the present invention (17) can be applied to a lid, a brush or the like formed as a cover for the disc insertion opening of the disc player when the optical disc 20 with the optical disc cover 1 is removed from the disc player. The corners of the outer peripheral wall can be taken out smoothly without being caught.

In the present invention (18), the film 2 is bonded to the center side of the outer peripheral wall 43 rather than the bottom wall inner peripheral end that defines the end of the lower surface rounded portion 47 of the lower surface 42 of the outer peripheral wall 43. An optical disc cover 1 characterized by the following. By forming the optical disk 20 with the present invention (18) inserted into the disk player or taking out after the insertion, the lid or brush formed as a cover for the disk insertion opening of the disk player. Etc. (not shown) can be smoothly inserted and removed without the outer peripheral edge of the film 2 being caught.

<Adhesion test method>
・ Peeling method: 180 degree peeling, adhesive tape width: optional, peeling length: 50 mm, peeling time: 1 minute ・ Test machine manufacturer: SHIMADZU, model number: Autograph, AG-1 100 kN

Cover opening that cuts unstretched TAC film (manufactured by Fuji Business Supply Co., Ltd., product number TACPHAN-N882GL 50 microns, film thickness 50 μm) into a circular shape with an outer diameter of 119.8 mm, and defines the inner peripheral edge of the film with a diameter of 20 mm at the center of the film Was opened by film excision. One slit (film cut) having a length of 5 mm was inserted into a part of the inner peripheral edge of the film toward the outer peripheral edge of the film. A re-peelable adhesive (adhesive strength with respect to an optical disk is 2.3 N / 25 mm) with a width of 0.6 mm is applied 0.2 mm inward from the outer peripheral edge of one side of the film. In addition, a sheet-like tab with a releasable adhesive applied at one end to a part of the surface opposite to the surface to which the adhesive of the film is applied so that the other end of the tab is outside the outer peripheral edge of the film. Then, adhesive sticking (adhesion strength 1 N / 25 mm) was performed. Further, a releasable front cover film (material PP, manufactured by Tosero Co., Ltd., product number OPU-1, thickness 50 μm) having the same shape as the above film is adhesively stuck on the tab (adhesive strength 0.06 N). / 25 mm). Further, the surface of the film coated with the pressure-sensitive adhesive was adhered to a releasable paper (product number K8P (01), manufactured by Annex) to produce an optical disk cover of the present invention (9). The adhesive strength between the releasable paper and the film was 0.1 N / 25 mm.
After removing the releasable paper of the optical disc cover of the present invention (9) by pulling up the tab 5, the optical disc (DVD made by TDK, 4.3GB) is used according to the method of the present invention 12 using the jig of the present invention 11. 12 mm, disk opening diameter 15 mm, thickness 1.2 mm, data storage area outer diameter 118 mm, data storage area inner diameter 46). Insert this into a disk drive (slot-in type: a disk insertion slot is equipped with a sponge-like cover member) of a commercially available notebook PC (NEC, product number LN300 / C, product name LAVIE), and save the movie on the disk The reproducibility of the (movie) and the handleability of the optical disc with the optical disc cover (whether the film does not wrinkle) were confirmed. The results are shown in Table 1.

  When the thickness of the film was 30 μm and 40 μm, the result was exactly the same as in Example 1. In addition, when the film thickness was 20 μm, 10 μm, and 60 μm, the moving image reproduction was completely the same, and the handling property was slightly inferior, but almost the same.

Comparative Example 1

  It carried out like Example 1 except having changed the thickness of the film into 80 micrometers. The results are shown in Table 1.

Comparative Example 2

  The same procedure as in Example 1 was performed except that the film was changed to a stretched TAC film. The results are shown in Table 1.

Comparative Example 3

  The same procedure as in Example 1 was performed except that the film was replaced with a commercially available PC film. The results are shown in Table 1.

Comparative Example 4

  The same procedure as in Example 1 was performed except that the film was replaced with a commercially available PP film. The results are shown in Table 1.

Comparative Example 5

  It carried out like Example 1 except having changed the film into the commercially available PE film. The results are shown in Table 1.

Comparative Example 6

  The same procedure as in Example 1 was performed except that the film was replaced with a commercially available PET film. The results are shown in Table 1.

Comparative Example 7

  The same operation as in Example 1 was performed except that the diameter of the film was 120 mm which was the same as the diameter of the optical disk. The results are shown in Table 1.

Comparative Example 8

  The same procedure as in Example 1 was performed, except that the cover opening part straight line was changed to 15 mm as with the disk opening part diameter. The results are shown in Table 1.

Comparative Example 9

  The same procedure as in Example 1 was conducted except that the adhesive part outer diameter was changed to 119.8 mm which was the same as the film outer diameter. The results are shown in Table 1.

Comparative Example 10

  The same procedure as in Example 1 was performed except that the slit at the inner peripheral edge of the cover was eliminated. The results are shown in Table 1.

Cover opening that cuts unstretched TAC film (manufactured by Fuji Business Supply Co., Ltd., part number TACPHAN-N882GL 50 microns, film thickness 50 μm) into a circular shape with an outer diameter of 120.2 mm and defines an inner peripheral edge 13 with a diameter of 20 mm at the center of the film The film 9 was formed by opening the portion 9 by cutting the film. On the other hand, ABS resin () was molded into an annular frame 40 having the dimensions shown in FIG. 20 using an injection molding machine. The film 2 was adhered to the lower surface 42 of the outer peripheral wall 43 and the lower surface of the bottom wall 45 of the annular frame 40 so as to be concentric with the annular frame 40, whereby the optical disc cover 1 of the invention (13) was manufactured. The outer peripheral edge of the film of the optical disc cover 1 was closer to the center of the annular frame 40 than the end of the lower surface rounded portion 48 of the annular frame 40. The optical disk cover 1 was mounted on the data reading surface of an optical disk 20 (DVD made by TDK, 4.3 GB, diameter 12 mm, disk opening diameter 15 mm, thickness 1.2 mm, data storage area outer diameter 118 mm, data storage area inner diameter 46). Insert this into a disk drive (slot-in type: a disk insertion slot is equipped with a sponge-like cover member) of a commercially available notebook PC (NEC, product number LN300 / C, product name LAVIE), and save the movie on the disk The reproducibility of (movie) and the handleability of the optical disc 20 with the optical disc cover 1 mounted thereon were confirmed. The results are shown in Table 1.

Comparative Example 11

  The same operation as in Example 3 was performed except that the thickness of the film was changed to 80 μm. The results are shown in Table 1.

Comparative Example 12

  The same procedure as in Example 3 was performed except that the diameter of the disk opening 21 was the same as the diameter of the cover opening 9. The results are shown in Table 1.

Comparative Example 13

  The same operation as in Example 3 was performed except that the diameter of the film 2 was made larger than the diameter of the end portion of the lower surface rounded portion. The results are shown in Table 1.

Comparative Example 14

  It carried out similarly to Example 3 except having eliminated the upper surface round part and the lower surface round part. The results are shown in Table 1.

From Table 1, the following is clear.
(1) From Example 1 and Comparative Example 2, the unstretched film of the present invention is better.
(2) From Example 1 and Comparative Examples 3, 4, 5, and 6, the resin material is preferably cellulose triacetate of the present invention (3).
(3) Example 1 From Comparative Example 1, the film thickness is too thick at 80 μm. The present invention 3 (10 to 60 μm) is preferable.
(4) From Example 1 and Comparative Example 7, the film diameter should be smaller than the disk diameter as in the present invention 4.
(5) From Example 1, Comparative Example 8, Example 3, and Comparative Example 12, the diameter of the cover opening 9 is preferably larger than the diameter of the disk opening as in the fifth aspect of the present invention.
(6) From Example 1 and Comparative Example 9, the outer diameter of the adhesive portion 11 is preferably smaller than the diameter of the film 2 as in the present invention 6.
(7) From Example 1 and Comparative Example 10, it is better to have a slit at the inner peripheral edge of the cover as in the present invention 8.
(8) From Example 2 and Comparative Example 11, the film thickness is too thick at 80 μm. 10-60 micrometers of this invention 3 are good.
(9) From Example 2 and Comparative Example 12, the film thickness is too thick at 80 μm. 10-60 micrometers of this invention 3 are good.
(10) From Example 2 and Comparative Example 13, as in the present invention 18, the diameter of the inner peripheral end of the bottom wall radius is preferably larger than the diameter of the outer peripheral end of the film 2.
(11) From Example 2 and Comparative Example 114, it is better to form the upper surface rounded portion and the lower surface rounded portion as in the present invention 17.

DESCRIPTION OF SYMBOLS 1 Optical disk cover 2 Film 3 Film adhesive 4 Removable paper 5 Tab 6 Tab adhesive 7 Front cover film 8 Front cover film adhesive 9 Cover opening part 10 Slit 11 Adhesive part 13 Film inner peripheral edge 20 Optical disk 21 Disc opening portion 30 Optical disc cover mounting jig 31 Columnar projection portion 32 Disc placement portion 33 Cylindrical cap 34 Base 40 Annular frame 41 Upper surface 42 Lower surface 43 Outer peripheral wall 44 Annular inner peripheral end 45 Bottom wall 46 Protruding portion 47 Upper surface round portion 48 Bottom face round

Claims (18)

  An optical disk cover, which is formed of a film made of a transparent unstretched resin and covers a data reading surface of an optical disk.   2. The optical disc cover according to claim 1, wherein the material of the film is mainly composed of cellulose triacetate. The optical disk cover according to claim 1, wherein the film has a thickness of 10 to 60 μm. The film has an adhesive part in which the outer shape is circular and the diameter is smaller than the outer diameter of the optical disk, and a releasable adhesive is applied with a certain width along the vicinity of the entire outer periphery on one side of the film. The optical disk cover according to claim 1, further comprising: an optical disk cover according to claim 1.   The optical disc has a disc shape and has a disc opening formed with an inner peripheral edge of a disc that defines an opening in the center, the data reading surface is formed on one side of the optical disc, and the data reading surface has Data between the outer circumference data non-storing area with a constant width along the outer circumference, the inner circumference data non-storing area with a constant width along the inner circumference, and the data between the outer circumference data non-storing area and the inner circumference data non-storing area A storage opening, wherein the film has a cover opening formed with an inner peripheral edge of the film that defines an opening having a diameter larger than the diameter of the disk opening and smaller than the inner diameter of the data storage area. The optical disc cover according to any one of claims 1 to 4.   The optical disc cover according to claim 4 or 5, wherein the adhesive portion has an outer diameter smaller than that of the film. 7. The optical disc cover according to claim 4, wherein the adhesive portion is formed in a portion corresponding to the outer periphery data non-storage area of the optical disc. The optical disc cover according to any one of claims 5 to 7, wherein a short slit is formed in the film from a part of the inner peripheral edge toward the outer peripheral edge of the film.   A surface of the film on which the adhesive portion is formed is adhered to a releasable paper, and an adhesive that can be re-removed at one end is provided in the vicinity of the outer peripheral edge of the surface opposite to the surface on which the adhesive portion of the film is formed The coated sheet-like tab is adhered, the other end of the tab is formed to protrude outside the outer peripheral edge of the film, and the tab is opposite to the surface on which the adhesive portion of the film is formed. 9. The optical disc cover according to claim 7, wherein a re-peelable front cover film having the same shape as the film is adhered on the concentric circle with the film.   The adhesive force between the surface of the film opposite to the surface where the adhesive portion is formed and the front cover film is smaller than the adhesive force between the film and the data reading surface of the optical disc, and the adhesive portion of the film is formed. The adhesive force between the opposite surface and the tab is smaller than the adhesive force between the optical disc cover and the data reading surface of the optical disc, and the adhesive force between the optical disc cover and the releasable paper is the same as that of the film. The optical disk cover according to claim 9, wherein the optical disk cover has an adhesive strength smaller than that of the surface opposite to the surface on which the adhesive portion is formed and the tab.   A jig for mounting the optical disk cover according to claim 5 to an optical disk, wherein a columnar protrusion having substantially the same diameter as the disk opening of the optical disk is formed at the center thereof. Detachable having a pedestal having a mounting portion on which an optical disk can be stably mounted, and a cylindrical portion having substantially the same inner diameter as the outer diameter of the columnar protrusion and the outer diameter of the cover opening. And an optical disc cover mounting jig. The optical disk cover mounting jig according to claim 11 is placed on a flat plate when the optical disk cover according to claim 9 or 10 is mounted on an optical disk using the optical disk cover mounting jig according to claim 11. A step, a step of removing the cap 33, a step of inserting the disc opening at the center with the data reading surface of the optical disc up into a projection at the center of the optical disc cover mounting jig, and abutting against the mounting portion Inserting the cap into the protrusion and contacting the data surface of the optical disc; and inserting the optical disc cover according to claim 9 or 10 into the cap with the surface on which the adhesive portion is formed facing downward. A step of contacting the optical disc surface, a step of pressing and adhering the adhesive portion to the optical disc, and pulling up the tab to form the film and the tab and Optical disk cover mounting method characterized by comprising the a step of re-peeling the table cover film. An annular outer peripheral wall having an upper surface and a lower surface, a bottom wall extending from the inner side of the lower part of the outer peripheral wall toward the center of the annular outer peripheral wall and defining an annular inner peripheral edge, and from the inner side of the upper part of the outer peripheral wall The film is bonded to the lower surface of the outer peripheral wall and / or the lower surface of the bottom wall so as to cover the entire inner side of the annular frame including a plurality of flat plate-shaped projecting portions toward the center of the outer peripheral wall. The optical disc cover according to claim 1, wherein the optical disc cover is provided.   The optical disk has a disk shape and has a disk opening which is an opening in the center, the data reading surface is formed on one side of the optical disk, and the data reading surface has an outer periphery with a certain width along the outer periphery. A data non-storage area, an inner circumference data non-storage area of a certain width along the inner circumference, and a data storage area between the outer circumference data non-storage area and the inner circumference data non-storage area, the film, 14. The optical disk cover according to claim 13, further comprising a cover opening formed with an inner peripheral edge of a film that defines an opening having a diameter larger than the diameter of the disk opening and smaller than the inner diameter of the data storage area. . 15. The annular inner peripheral end of the bottom wall is formed in a portion corresponding to an outer peripheral data non-storage area of the optical disc when the optical disc cover is mounted on the optical disc. Optical disc cover as described in 1. The optical disc cover according to any one of claims 13 to 15, wherein a length of the protrusion is not less than 0.2 mm and not more than 2 mm. The optical disc cover according to any one of claims 13 to 16, further comprising an upper rounded portion and a lower rounded portion, each of which is formed in a rounded shape with no corners on the outer and upper portions of the outer peripheral wall. The said film is adhere | attached on the center side of the said outer peripheral wall rather than the bottom wall round inner peripheral end which demarcates the edge part of the said lower round part of the said outer peripheral wall lower surface. Optical disc cover.

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