CN1254805C

CN1254805C - Optical disk for inspection

Info

Publication number: CN1254805C
Application number: CNB031427707A
Authority: CN
Inventors: 蔀干夫; 加藤誉一
Original assignee: Victor Company of Japan Ltd
Current assignee: Victor Company of Japan Ltd
Priority date: 2002-06-24
Filing date: 2003-06-13
Publication date: 2006-05-03
Anticipated expiration: 2023-06-13
Also published as: KR20040000318A; CN1471097A; JP2004206853A; KR100500748B1

Abstract

An optical disk for examination is provided to fabricate different kinds of optical disks by using shared components such as a center core and a disk body, respectively, thereby improving production efficiency and reducing a production cost. A ring-type center portion(1A) has the first outside diameter and a spindle hole(1A1), and has a thin part(1A2). A disk body(1B) has an opening portion opened to the first inside diameter bigger than the first outside diameter on the first surface, or opened to the second inside diameter smaller than the first outside diameter on the second surface, has a thin part(1B2) formed by being complemented with the thin part(1A2), and has a center portion(1A) which can be detachably housed in the opening portion from the first surface. In the disk body(1B), an information track area is concentrically formed with an outside diameter of a ring-type disk.

Description

The inspection CD

Technical field

The present invention relates in the manufacturing process etc. of the optical disc apparatus of record reproducing playback information on CD the inspection CD that is used to carry out various adjustment or measurement.

Background technology

In the manufacturing process of the optical disc pick-up (pickup) of the optical disc apparatus that CD (CD), digital multifunctional CD (DVD) etc. is write down, resets,, use and check and use CD in order to adjust or to measure.

As this inspection CD, can adopt the center (off-centre) of the spindle hole position deviation dish that makes dish, rotation along with dish, information track is at the off-centre inspection CD of radial direction swing, or the main shaft clamping face becomes the drift angle with the information track face, along with the rotation of dish, the information track face is checked in the face swing of turning axle direction swing and is used CD.

Check the example of using CD as these, record to some extent in patent documentation 1.

Use in the CD in this patent documentation 1 contained inspection, the eccentric inspection with CD is that the central cores that will medium pore be formed with the ormal weight off-center engages and forms with disc main body, and the face swing checks with CD it is that the face pendular ring that will form the front and the back side engages and forms with disc main body non-parallelly.

Patent documentation 1: open flat 4-86226 communique in fact

But existing eccentric the inspection used CD, forms by making medium pore depart from disk center with ormal weight in advance, perhaps as mentioned above, the off-centered central cores of medium pore will be bonded on the disc main body forms.

In addition, existing swing checked and to be used CD, by form front and back non-parallelly its variation in thickness formed, and perhaps as mentioned above, the central cores that forms front and back in advance is bonded on the disc main body non-parallelly forms.

Therefore, for off-centre inspection CD, when needing the different dish of offset, must be to each offset manufacturing dish itself or central cores.

In addition, use CD for face swing inspection, when the different CD of demand side oscillating quantity, must be to each face oscillating quantity manufacturing dish itself or central cores.

Therefore, existing inspection production cost of optical discs height, production efficiency is low, also has, and central cores can not be checked that with CD and face swing the universal component with CD uses as the off-centre inspection.

So, the object of the present invention is to provide can with universal component (central cores and disc main body) make respectively different types of inspection with CD (eccentric check with CD, face swing check check with CD, off-centre and face swing use CD), all good inspection CD aspect production cost and production efficiency.

Summary of the invention

For solving above-mentioned problem, device of the present invention has following structure.

Promptly, technical scheme 1 of the present invention is a kind of inspection CD, be used for to recorded information on the CD or from the CD the optical disc apparatus of playback information check, it is characterized in that, comprise: the 1A of annular central portion, have spindle hole 1A1 in the inboard of circular slab, have from the 1st thin plate part 1A2 of the inside all sides of outer circumference end with the width formation of regulation at peripheral part with the 1st outer diameter D 3; And disc main body 1B, be ring-type, be included in and have on the surface than the 1st big inside diameter D 4 of above-mentioned the 1st outer diameter D 3, and the peristome 1B4 that on another surface, has 2nd inside diameter D 2 littler than above-mentioned the 1st outer diameter D 3, place above-mentioned central portion 1A from an above-mentioned face side, has the 2nd thin plate part 1B2 that forms with shape to outer circumferential side from the end of above-mentioned peristome 1B4 with above-mentioned the 1st thin plate part 1A2 complementation, more depending on the information track district 1B1 that has record check usefulness data on the outer circumferential side than above-mentioned the 2nd thin plate part 1B2, above-mentioned the 1st thin plate part 1A2 is engaged with above-mentioned the 2nd thin plate part 1B2, make center and the above-mentioned disc main body 1B of above-mentioned spindle hole 1A1 depart from ormal weight, thereby make eccentric the inspection with CD 2.

In addition, technical scheme 2 of the present invention is a kind of inspection CDs, be used for the optical disc apparatus of recorded information on CD or playback information is checked, it is characterized in that, comprise: the 1A of annular central portion, have spindle hole 1A1 in the inboard of circular slab, have from the 1st thin plate part 1A2 of the inside all sides of outer circumference end with the width formation of regulation at peripheral part with the 1st outer diameter D 3; And disc main body 1B, be ring-type, be included in and have on the surface than the 1st big inside diameter D 4 of above-mentioned the 1st outer diameter D 3, and on another surface with the peristome 1B4 of 2nd inside diameter D 2 littler than above-mentioned the 1st outer diameter D 3, place above-mentioned central portion 1A from an above-mentioned face side, has the 2nd thin plate part 1B2 that forms with shape to outer circumferential side from the end of above-mentioned peristome 1B4 with above-mentioned the 1st thin plate part 1A2 complementation, more depending on the information track district 1B1 that has record check usefulness data on the outer circumferential side than above-mentioned the 2nd thin plate part 1B2, above-mentioned the 1st thin plate part 1A2 is engaged with above-mentioned the 2nd thin plate part 1B2, make the face swing h1 that when the light disc spins is used in above-mentioned inspection, produces ormal weight, thereby make face swing inspection CD 3.

In addition, technical scheme 3 of the present invention is a kind of inspection CDs, be used for checking to recorded information on CD or from the optical disc apparatus of cd-rom playback information, it is characterized in that, comprise: the 1A of annular central portion, have spindle hole 1A1 in the inboard of circular slab, have from the 1st thin plate part 1A2 of the inside all sides of outer circumference end with the width formation of regulation at peripheral part with the 1st outer diameter D 3; And disc main body 1B, be ring-type, be included in and have on the surface than the 1st big inside diameter D 4 of above-mentioned the 1st outer diameter D 3, and the peristome 1B4 that on another surface, has 2nd inside diameter D 2 littler than above-mentioned the 1st outer diameter D 3, place above-mentioned central portion 1A from an above-mentioned face side, the 2nd thin plate part 1B2 that end with above-mentioned peristome 1B4 forms with the shape with above-mentioned the 1st thin plate part 1A2 complementation to outer circumferential side, more depending on the information track district 1B1 that has record check usefulness data on the outer circumferential side than above-mentioned the 2nd thin plate part 1B2, above-mentioned the 1st thin plate part 1A2 is engaged with above-mentioned the 2nd thin plate part 1B2, make center and the above-mentioned disc main body 1B of above-mentioned spindle hole 1A1 depart from ormal weight, and make the face swing that when the light disc spins is used in above-mentioned inspection, produces ormal weight, thereby make eccentric and face swing inspection CD.

Description of drawings

Fig. 1 is used to illustrate the partial longitudinal section of inspection of the present invention with the size shape of the each several part of CD.

Fig. 2 is used to illustrate as eccentric the inspection use CD, the partial longitudinal section of the size shape of the each several part when forming inspection of the present invention with CD.

Fig. 3 illustrates as face swing inspection to use CD, the partial longitudinal section of the size shape of the each several part when forming inspection of the present invention with CD.

Fig. 4 is used for checking that as off-centre inspection CD, face swing using CD and off-centre and face to swing inspection uses CD, the planimetric map of the manufacturing installation of off-centre adjustment when forming inspection of the present invention with CD respectively and face swing adjustment.

Fig. 5 is used to illustrate that the manufacturing installation that uses Fig. 4 carries out the eccentric figure that adjusts.

Fig. 6 is used to illustrate that the manufacturing installation that uses Fig. 4 carries out the figure that the face swing is adjusted.

Fig. 7 is used to illustrate as eccentric and face swing inspection use CD, the partial longitudinal section of the size shape of the each several part when forming inspection of the present invention with CD.

Embodiment

Utilize Fig. 1～Fig. 7 that example of the present invention is illustrated its preferred embodiment below.

Fig. 1 is used to illustrate the partial longitudinal section of inspection of the present invention with the size shape of CD each several part.

Fig. 2 is used to illustrate the partial longitudinal section that inspection of the present invention is become the size shape of eccentric each several part when checking with CD with the light dish type.

Fig. 3 is the partial longitudinal section that the size shape of the each several part when inspection of the present invention become face swing and check with CD with the light dish type is shown.

Fig. 4 checks when use CD in that inspection of the present invention is formed eccentric the inspection with CD and face swing respectively with CD, is used for eccentric adjust and face is swung the planimetric map of the manufacturing installation of adjustment.

Fig. 7 is the partial longitudinal section that is used to illustrate the size shape of the each several part when inspection of the present invention become eccentric and face swing and check the usefulness CD with the light dish type.

Inspection of the present invention has with CD 1: the central cores 1A (with reference to Fig. 1 (b)) that is roughly annular; With annular disk main body 1B (with reference to Fig. 1 (a)), all peristomes (to call accepting hole in the following text) 1B4 of this central cores 1A can be freely placed in formation from one side (arrow a direction, face 1Ba side) loading and unloading.

Central cores 1A is to be maximum outside diameter with big footpath D3, has by being in a ratio of the stage portion that the less outer diameter D 1 of path constitutes, the positive annular construction member that forms with the back side with big footpath D3 with paralleling.

In the outside of this stage portion, form the core side thin plate part 1A2 of wide eaves shape with the width (D3-D1)/2 of regulation.

It is big that directly D3, little outer diameter D 1 and spindle hole 1A1 form with one heart.

In addition, the front of central cores 1A, the part between spindle hole 1A1 and core side thin plate part 1A2 has by the back the anchor clamps 30B of the manufacturing installation 30 addressed from ring gripping district 1A3 that the two sides side is clamped.

Disc main body 1B is have outer diameter D 5 discoideus, have on a surface with external diameter D4 opening, on another surface with the accepting hole 1B4 of outer diameter D 2 openings littler than this outer diameter D 4.So, in this accepting hole 1B4, formed the main body side thin plate part 1B2 (main body side thin plate part 1B2 is arranged on the periphery of accepting hole 1B4) that forms with shape with the shape complementarity of the core side thin plate part 1A2 of external diameter central cores 1A, on a surface (front) or another surface (back side) in the outside of this main body side thin plate part 1B2, record check forms the ring-type concentric with the outer diameter D 5 of disc main body 1B with the information track district 1B1 of data.

Check with CD 1 it is that core side thin plate part 1A2 with central cores 1A engages with the main body side thin plate part 1B2 of disc main body 1B and the dish that forms.

So this is checked with CD 1, by central cores 1A is located and engages with disc main body 1B, makes the off-centre that produces ormal weight when disc spins to have formed eccentric inspection CD 2 (Fig. 2).

In addition, by central cores 1A is located and engages, make the face swing that when disc spins, produces ormal weight with disc main body 1B, formed face swing inspection CD 3 (Fig. 3).

Also have, by with central cores 1A with disc main body 1B location and engages, make the off-centre that when this disc spins, produces ormal weight simultaneously and the face swing of ormal weight, formed eccentric and face is swung inspection CD 4 (Fig. 7).

As mentioned above, each size of central cores 1A and disc main body 1B is determined by following method.

If the width of the core side thin plate part 1A2 of central cores 1A is (the path D1 of the big footpath D3-central cores of central cores)/2,

If the width of the main body side thin plate part 1B2 of disc main body 1B is (the path D2 of the big footpath D4-disc main body of disc main body)/2.

Here, if establish:

A: the minimum that core side thin plate part 1A2 engages with main body side thin plate part 1B2 when eccentric engages width,

E: when eccentric with respect to the offset of disk center's point B,

S1: the minimum cement that the path fixed part of central cores engages with the path hole fixed part of disc main body when eccentric injects width,

S2: the minimum cement that the big footpath fixed part of central cores engages with hole, the big footpath fixed part of disc main body when eccentric injects width,

φ a: the injection nozzle od of cement 5,

H2: the thickness of disc main body,

The size of the big footpath D4 of the big footpath D3 of the path D2 of disc main body, central cores and disc main body then can be expressed as respectively:

D2＝D1+2(S1+E)

D3＝D1+2(S1+E)+2(A+E)

D4＝D1+2(S1+E)+2(A+E)+2(S2+E)

At this moment, each size preferably be provided with satisfied below all formulas:

①S1＞φa，S2＞φa

②A≥H2/2

③E≤H2/4。

1. formula makes when injecting cement 5, can make nozzle as much as possible near applicator surface, and thus, it is good that the filling of cement 5 becomes.The external diameter φ a of employed nozzle is advisable about with 0.1mm～1mm, and about 0.4mm is suitable especially.

2. formula is for guaranteeing the desirable scope of sufficient joint strength.

3. formula is to have comprised the setting of checking necessary maximum eccentricity amount 300 μ m when H2=1.2mm as described later.

On the other hand, if establish:

H1: the face oscillating quantity of swinging reference point C with respect to face during the face swing,

H2: face when swing be with respect to the face oscillating quantity of the big footpath fixed part (thickness H4) of central cores,

H3: the bond thickness of the fixed part of the big footpath fixed part of central cores and disc main body during the face swing,

H5: the bond thickness that big footpath fixed part when eccentric, that engage central cores engages with the fixed part of disc main body,

R1: the radius of swing reference point C from disk center's point B to face,

Then as the big footpath fixed part thickness H4 of the central cores of core side thin plate part thickness with from disc main body thickness H2, deduct main body side thin plate part thickness and each size of hole, the big footpath fixed part thickness H3 of the disc main body that obtains can be expressed as respectively:

H4＝H3-H5

H5＝h2+h3

h2/h1＝D3/2r1

H2/2≤H3≤(H2/2+H5)

Each size preferably is provided with to such an extent that satisfy these formulas.

The path D1 of central cores also can be the diameter with part of side outside the external diameter that is positioned at clamp area 1A3, and the big footpath D4 of disc main body also can be the diameter that is positioned at side within the internal diameter of information track district 1B1.

In addition, central cores thickness H1 can equate that also hole, the big footpath fixed part thickness H3 of disc main body also can be 1/2nd of disc main body thickness H2 with disc main body thickness H2.

Below according to the manufacturing of＜central cores 〉,＜manufacturing of disc main body order the manufacturing of central cores 1A and disc main body 1B is specifically described.

The manufacturing of＜central cores 〉

Central cores 1A uses polycarbonate material, by cut, makes positive parallelly with the back side, and makes spindle hole 1A1 and D3 greatly directly and little outer diameter D 1 concentric and make with two surperficial quadratures.

The manufacturing of＜disc main body 〉

About the kind of disc main body 1B, the disc main body corresponding with the CD (CD) that is made of 1 plate base of diameter (outer diameter D 5) 120mm, thick 1.2mm arranged and two kinds of disc main bodies that the DVD (digital multifunctional CD) of the thick 1.2mm that forms with baseplate-laminating with 2 diameters (outer diameter D 5) 120mm, thick 0.6mm is corresponding.

The disc main body 1B corresponding with CD is transparent 1 thick plate base of 1.2mm, forms and the information pitted surface (information track district 1B1) of checking the corresponding formation of usefulness data at the back side of the information reading face c of disc main body 1B.In addition, reflective coating and protective film have been folded on this information pitted surface upper strata.

The disc main body 1B corresponding with DVD is the transparent thick substrate of 0.6mm, and be reflected rete and protective film of the information pitted surface of information reading face dorsal part covers.Then, to clamp the mode of this face, the substrate that 0.6mm is thick is fitted, and forms the thickness of 1.2mm.

Any disc main body 1B uses with central cores 1A identical materials and forms.

The accepting hole 1B4 with disc main body path D2 and the big footpath D4 of disc main body of the disc main body 1B corresponding with CD forms by cut.

On the other hand, the disc main body 1B corresponding with DVD, with with form corresponding to the identical job operation of the accepting hole 1B4 of the disc main body 1B of CD, perhaps by formation that the substrate that has the 0.6mm of the big footpath D4 of disc main body path D2 and disc main body is respectively fitted, present embodiment forms with last method.

Set the relative position of above-mentioned central cores 1A and disc main body 1B with manufacturing installation 30, engage the core side thin plate part 1A2 of central cores 1A and the main body side thin plate part 1B2 of disc main body 1B with cement 5, make the inspection CD of various uses, promptly eccentric the inspection with CD 2, face swing inspection checked with CD 4 with CD 3, off-centre and face swing.

Utilize Fig. 4～Fig. 7 below,, comprise that manufacturing installation is elaborated its manufacture method.

＜about manufacturing installation 30 〉

Manufacturing installation 30, as shown in Figure 5, by the central cores platform 30A that makes central cores 1A maintenance level; Central cores anchor clamps 30B; Can keep with the offset E of the appointment of relative disk center's point B checking with

CD

2,3,4, can tilt to keep to check dish platform 30C simultaneously with the face oscillating quantity h1 that opposite face is swung the appointment of reference point C (with reference to Fig. 3, Fig. 7) with

CD

2,3,4; And plate clamp 30D constitutes.

Can adjust 4 eccentric the adjust scale 30E～30Hs of eccentric inspection,, combine with dish platform 30C by means of screw thread to be mutually the equal angles interval of 90 degree with the offset E of CD 2.

By adjusting these 4 the eccentric scale 30E～30H that adjust, can obtain offset E arbitrarily.

In addition, can adjustment face swing check with 2 faces swings of the face oscillating quantity h1 (with reference to Fig. 3, Fig. 7) of CD 3 adjust scale 30I, 30J by screw thread with coil platform 30C and combine.

Adjust scale 30I, 30J by adjusting the swing of these faces, can make dish is fulcrum with reference point B, tilts in the direction of the arrow bb of Fig. 6, obtains face oscillating quantity h1 arbitrarily.

Be described in detail below＜eccentric check manufacturing with CD 2 〉,＜the face swing checks the manufacturing with CD 3 and＜eccentric and face swing checks the manufacturing of using CD 4 manufacturing process.＜eccentric the manufacturing of checking with CD 2〉(with reference to Fig. 2, Fig. 4, Fig. 5)

(operation 1) makes the upper surface that central cores 1A flatly is placed on the central cores platform 30A of manufacturing installation 30 (being that surperficial 1Aa shown in Figure 2 is a lower surface) under its big footpath D3 side direction.

(operation 2) fixes from the upper surface of the central cores 1A central cores 1A with horizontal positioned with central cores anchor clamps 30B.

(operation 3) makes the upper surface that disc main body 1B flatly is placed on the dish platform 30C of manufacturing installation 30 (being that surperficial 1Ba shown in Figure 2 is a lower surface) under its big footpath D4 side direction.

(operation 4) adjusts 4 eccentric scale 30E～30H that adjust, displacement disc main body 1B, make its center with the offset E of appointment with respect to central cores 1A off-centre.

(operation 5) fixes disc main body 1B with plate clamp 30D.

(operation 6) injects UV (ultraviolet hardening) cement 5 with the nozzle (not shown) of φ a between the main body side thin plate part 1B2 of the core side thin plate part 1A2 of central cores 1A and disc main body 1B, make its curing then, and both are engaged.

By means of above (operation 1)～(operation 6), make eccentric the inspection with CD 2.The manufacturing with CD 3 is checked in the swing of＜face〉(with reference to Fig. 3, Fig. 4, Fig. 6)

(operation 1A) makes the upper surface that central cores 1A flatly is placed on the central cores platform 30A of manufacturing installation 30 (being that surperficial 1Aa shown in Figure 3 is a lower surface) under its big footpath D3 side direction.

(operation 2A) fixes from the upper surface of the central cores 1A central cores 1A with horizontal positioned with central cores anchor clamps 30B.

(operation 3A) flatly is placed on the upper surface of the dish platform 30C of manufacturing installation 30 with disc main body 1B, make (being that surperficial 1Ba shown in Figure 3 is a lower surface) under its big footpath D4 side direction.

(operation 4A) adjusts 4 eccentric scale 30E～30H that adjust and carries out the position adjustment, makes the departing from permissible range of center of the center of disc main body 1B and central cores 1A.Basically main body 1B and central cores 1A are disposed with one heart.

(operation 5A) adjusts scale 30I, 30J by the swing of adjustment face, and with the dish platform 30C inclination of carrier main body 1B, making disc main body 1B is specified amount with respect to the face oscillating quantity h1 of face swing reference point C.

(operation 6A) fixes disc main body 1B with plate clamp 30D.

(operation 7A) injects UV (ultraviolet hardening) cement 5 with the nozzle (not shown) of φ a between the main body side thin plate part 1B2 of the core side thin plate part 1A2 of central cores 1A and disc main body 1B, make its curing then, and both are engaged.

By means of above (operation 1A)～(operation 7A), the swing of manufacturing face is checked with CD 3.

The manufacturing of usefulness CD 4 is checked in＜eccentric and face swing〉(with reference to Fig. 4～Fig. 7)

(operation 1B) makes the upper surface that central cores 1A flatly is placed on the central cores platform 30A of manufacturing installation 30 (being that surperficial 1Aa shown in Figure 7 is a lower surface) under its big footpath D3 side direction.

(operation 2B) fixes from the upper surface of the central cores 1A central cores 1A with horizontal positioned with central cores anchor clamps 30B.

(operation 3B) makes the upper surface that disc main body 1B flatly is placed on the dish platform 30C of manufacturing installation 30 (being that surperficial 1Ba shown in Figure 7 is a lower surface) under its big footpath D4 side direction.

(operation 4B) adjusts 4 eccentric scale 30E～30H that adjust, and disc main body 1B is moved, and makes its center with the offset E of the appointment center off-centre with respect to central cores 1A.

(operation 5B) adjusts scale 30I, 30J by the swing of adjustment face, and the dish platform 30C of carrier main body 1B is tilted, and making disc main body 1B is specified amount with respect to the face oscillating quantity h1 of face swing reference point C.

(operation 6B) fixes disc main body 1B with plate clamp 30D.

(operation 7B) injects UV (ultraviolet hardening) cement 5 with the nozzle (not shown) of φ a between the main body side thin plate part 1B2 of the core side thin plate part 1A2 of central 1A and disc main body 1B, make its curing then, and both are engaged.

Above-mentioned (operation 4B) can put upside down with the order of (operation 5B).

By means of above (operation 1B)～(operation 7B), make eccentric and face swing inspection CD 4.

With the inspection of above-mentioned manufacture method manufacturing can enough same central cores 1A with CD 1 and disc main body 1B make following inspection CD 1., 2. and 3. respectively, be can common component, thereby the high inspection CD of production efficiency.This inspection CD 1., 2. and 3. is:

1. eccentric the inspection with CD 2 makes the position (off-centre) of the B of position deviation disk center of spindle hole 1A1, makes that information track 1B1 swings at radial direction along with the rotation of dish.

2. face is swung and is checked with CD 3, makes main shaft clamping face (clamp area 1A3) become the drift angle with information track face (information track district 1B1), makes that the information track face is swung in the turning axle direction along with the rotation of dish.

3. eccentric and face swing is checked with CD 4, make the position of the B of position deviation disk center of spindle hole 1A1, make simultaneously between main shaft clamping face and the information track face and form the drift angle, make along with the rotation of coiling, information track 1B1 swings at radial direction, swings in the turning axle direction again simultaneously.

Embodiments of the invention are not limited to said structure, can do all changes in the scope that does not break away from aim of the present invention.

Cement is not limited to the UV curing type.As the example of other cements, can use cure shrinkage circlet oxygen class cement.

In addition, as mentioned above, information track district 1B1 can form on any one surface at the front of disc main body 1B, the back side.Also have, also can write down different inspection data, when carrying out the adjustment corresponding or measuring, to use with each inspection data at front and back.

The effect of invention

Inspection CD of the present invention with structure of above detailed explanation is because can be enough logical Make respectively the inspection CD (off-centre of different kinds with parts (central cores and disc main body) Check and use CD, face swing to check with CD and off-centre and face swing inspection CD), institute All to obtain good effect aspect production cost and the production efficiency.

Claims

1. an inspection CD is used for checking to recorded information on CD or from the optical disc apparatus of cd-rom playback information, it is characterized in that, comprising:

Annular central portion has spindle hole in the inboard of the circular slab with the 1st external diameter, has from 1st thin plate part of the inside all sides of outer circumference end with the width formation of regulation at peripheral part; And

Disc main body, be ring-type, be included in and have than big the 1st internal diameter of above-mentioned the 1st external diameter on the surface and on another surface, have the peristome of 2nd internal diameter littler than above-mentioned the 1st external diameter, place above-mentioned central portion from an above-mentioned face side, has the 2nd thin plate part that forms with shape to outer circumferential side from the end of above-mentioned peristome with above-mentioned the 1st thin plate part complementation, more leaning on the information track district that has record check usefulness data on the outer circumferential side than above-mentioned the 2nd thin plate part

Above-mentioned the 1st thin plate part is engaged with above-mentioned the 2nd thin plate part, make the center of above-mentioned spindle hole and above-mentioned disc main body depart from ormal weight, use CD thereby make eccentric the inspection.

2. an inspection CD is used for checking to recorded information on CD or from the optical disc apparatus of cd-rom playback information, it is characterized in that, comprising:

Above-mentioned the 1st thin plate part is engaged with above-mentioned the 2nd thin plate part, make the face swing that when the light disc spins is used in above-mentioned inspection, produces ormal weight, thereby make face swing inspection CD.

3. an inspection CD is used for checking to recorded information on CD or from the optical disc apparatus of cd-rom playback information, it is characterized in that, comprising:

Above-mentioned the 1st thin plate part is engaged with above-mentioned the 2nd thin plate part, make the center of above-mentioned spindle hole and above-mentioned disc main body depart from ormal weight, and make the face swing that when the light disc spins is used in above-mentioned inspection, produces ormal weight, thereby make eccentric and face swing inspection CD.