JP2567952Y2 - Inspection disk - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to an inspection disc,
In particular, the present invention relates to an inspection disk used for inspecting and adjusting the reproduction capability of a reproduction apparatus to which a disk as a recording medium is mounted.

[0002]

2. Description of the Related Art For example, on a recording surface of a compact disk, various physical factors such as black spots due to foreign matter during molding of the disk, dirt, dust or fingerprints adhering to the disk surface, lack of information layer (pit surface), scratches, etc. Defects can occur.

[0003] In order to measure the reproduction ability of a compact disk player against such a disk defect, a compact disk player assembled in a factory or the like is required to
In the inspection process, the inspection disk provided with the above-described defect is reproduced, and the reproduction capability is inspected and adjusted based on the reproduced signal.

[0004] This kind of inspection disk is provided with the following defect patterns (defect patterns). Interruption: A defect pattern for simulating a missing information layer (pit surface) and a flaw. Black band: A defect pattern for simulating black spots generated during disk molding and dirt, dust, etc. attached to the disk surface. Fingerprint: A defect pattern for simulating fingerprints attached to the disk surface.

[0005] Usually, a music signal is recorded as a recording signal on a test disk, but some of them record not only a music signal but also a sine wave signal.

[0006] On such a test disk, music signal recording tracks on which music signals are recorded and sine wave signal recording tracks on which sine wave signals are recorded are formed alternately. When the disc is mounted and played continuously, the sine wave signal recording track is played after the music signal recording track is played,
Subsequently, the music signal recording track and the sine wave signal recording track are alternately reproduced, for example, the next music signal recording track is reproduced.

The inspector mounts the inspection disk on the assembled compact disk player, and reproduces the reproduced music signal by hearing the defective pattern formed on the inspection disk using headphones or the like. To test and adjust their abilities,
Alternatively, the reproduced sine wave signal is electrically measured using a waveform measuring instrument such as an oscilloscope to inspect and adjust the reproduction ability of the compact disk player with respect to a defect pattern formed on the inspection disk.

[0008]

As described above, when inspecting the reproduction capability of a compact disk player, an inspection disk having the above-described pseudo defect pattern is used, and the pseudo defect pattern is reproduced. This makes it possible to simulate the reproduction ability of the compact disc player. When the inspector inspects the reproduced music signal by hearing, the inspector checks whether an abnormality has occurred when reproducing the pseudo defect pattern, and the inspector checks the music signal recording on which the desired music is recorded. Specify a track by an address number.

However, when a conventional test disc is used to check the reproduction capability of a compact disc player, music signal recording tracks and sine wave signal recording tracks are alternately recorded on the test disc. In some cases, the sine wave signal recording track is reproduced while the music signal recording track is being reproduced and inspected by hearing. At that time, the inspector will hear an unpleasant treble such as “Pee”.

Therefore, conventionally, in order to prevent the reproduction sound of the sine wave signal recording track from being heard, the address number of only the music signal recording track must be designated before the inspection, and the setting operation is troublesome. There is such a problem.

In addition, every time the inspector hears an unpleasant reproduction sound, he or she performs the inspection work while feeling uncomfortable, and the work efficiency is reduced each time.

Therefore, an object of the present invention is to provide an inspection disk which has solved the above-mentioned problems.

[0013]

The present invention provides a music signal recording track on which a music signal is recorded, a sine wave signal recording track on which a sine wave signal is recorded, the music signal recording track and the sine wave signal recording. In a test disk having a pseudo defect portion formed so as to intersect a track and a recording surface, a plurality of recording tracks including the music signal recording track except at least the sine wave signal recording track are provided on the recording surface. A second area provided with a plurality of recording tracks including the sine wave signal recording track except for the music signal recording track at least in a portion other than the first area on the recording surface; Forming a region, and forming the pseudo-defect portion in each of the first region and the second region.

[0014]

A first area in which at least a plurality of music signal recording tracks are provided on the recording surface of the inspection disk and a second area in which at least a plurality of sine wave signal recording tracks are provided in a portion other than the first area on the recording surface. By separately forming the second area and the second area, it is possible to easily set each area to be played back independently. For example, when an auditory inspection is performed, music signal recording recorded in the first area is performed. If a track is designated, it is possible to prevent a sine wave signal from being reproduced while a music signal is being reproduced.

[0015]

1 to 3 show an embodiment of an inspection disk according to the present invention.

In each of the drawings, a test disc 1 is used to test the reproduction capability of a compact disc player (not shown).
It is used by being mounted at a predetermined reproduction position of a compact disc player. This inspection disc 1 is manufactured to the same size as a generally used compact disc.
The upper surface is the information reading surface 1a, and the lower surface is the title printing surface 1b on which the title is printed. In the inspection disk 1, a reflective film 1d obtained by evaporating aluminum is formed on a lower surface of a polycarbonate resin disk 1c on a recording surface 1e, and a synthetic resin protective film 1f is joined to a lower surface of the recording surface 1e. I have.

On the recording surface 1e of the test disk 1, a circle formed at a substantially intermediate position in the radial direction is defined as a boundary line 2.
A first area 3 provided with a plurality of music signal recording tracks is formed inside the boundary 2, and a second area 4 provided with a plurality of sine wave signal recording tracks is formed outside the boundary 2. .

In the first area 3, for example, 13 different pieces of classical music (address numbers 1 to 13) are recorded for one minute and thirty seconds. In the second area 4, sine wave signal recording tracks are formed at address numbers 14 to 43, and for example, sine wave signals of 1 KHz and 10 KHz are alternately recorded on the recording tracks of address numbers 14 to 43 for 30 seconds. It is recorded in.

Further, the reading surfaces 1a,
A defect pattern (defect pattern) 5 as a pseudo defect is formed on the recording surface 1e. The defect pattern 5 extends in the radial direction so as to intersect the recording tracks recorded in the first area 3 and the second area 4, and is formed for each area.

In the defect pattern 5, an interruption 6, a black band 7, and a fingerprint 8 are sequentially formed from the inside to the outside in the first region 3,
In the second region 4, an interruption 6 ′, a black band 7 ′, and a fingerprint 8 ′ are sequentially formed from inside to outside.

The interruption 6 is a defect pattern for simulating a lack of the information layer (pit surface) formed on the recording surface 1e, a flaw, and the like. Crushed.

The black band 7 is a defect pattern for simulating black spots formed at the time of molding the disc and dirt and dust adhering to the disc surface. A black coating is printed on the reading surface 1 a of the test disc 1. I have.

The fingerprint 8 is a defect pattern for simulating a fingerprint attached to the disk surface, and a black coating is printed on the reading surface 1a of the inspection disk 1 like the black band 7.

Accordingly, a first area 3 on which a music signal is recorded is formed inside a recording track overlapping a fingerprint 8 printed at an intermediate position of the reading surface 1a, and a sine wave signal is formed outside the first area 3. Is recorded.

The interruption 6 formed in the first area 3 is provided at a position intersecting the music signal recording tracks of the address numbers 2 to 7, and the width in the circumferential direction is the same at the same address number. Equally, the shape gradually increases as the address number increases.

That is, the width of the interruption 6 in the circumferential direction increases stepwise as it moves from the inside to the outside.

The black band 7 formed in the first region 3 has substantially the same shape as that of the above-mentioned interruption 6,
It is provided at a position that intersects with the music signal recording tracks of address numbers 8 to 12. Therefore, black band 7
Has the same width in the circumferential direction at the same address number, and gradually increases as the address number increases.

The fingerprint 8 formed in the first area 3 is provided at a position that intersects the music signal recording track of address number 13. The width of the fingerprint 8 in the circumferential direction is constant.

Next, the interruption 6 'formed in the second area 4 is provided at a position crossing the sine wave signal recording tracks of the address numbers 16 to 29, and has a width in the circumferential direction of one. The even number is equal to the next odd number,
Each time the address number is increased (that is, for each even number), the shape gradually increases.

The black band 7 'formed in the second area 4 has substantially the same shape as that of the interruption 6', and is provided at a position intersecting the sine wave signal recording tracks of the address numbers 30 to 41. I have. Accordingly, the black band 7 'has a shape in which the width in the circumferential direction is gradually increased for each even number.

The fingerprint 8 'formed in the second area 4 is provided at a position crossing the sine wave signal recording tracks of the address numbers 42 to 43. The width of the fingerprint 8 'in the circumferential direction is constant.

In a factory where a compact disk player is assembled, the inspection disk 1 is mounted on the compact disk player that has been assembled in the inspection process, and the reproduction performance is inspected and adjusted. At that time, the inspector checks the sound skipping state due to a defect in the reproduced signal by hearing.

In this case, the music signal recorded in the first area 3 of the test disk 1 is reproduced by designating an arbitrary number from among the address numbers 2 to 13 and listening to the reproduced sound with headphones or the like. Adjust the sensitivity of the circuit that removes noise while checking whether there is any track deviation.

When measuring electrically using a waveform measuring instrument, an arbitrary number is selected from the address numbers 16 to 43 of the sine wave signal recorded in the second area 4 of the test disk 1. Is specified, and the change of the reproduction signal waveform is checked.

As described above, in the inspection disk 1 described above,
Since the first area 3 of the music signal and the second area 4 of the sine wave signal are recorded separately inside and outside the boundary 2, the reproduction capability of the compact disk player using the inspection disk 1 When the test is performed, the address number of the first area 3 of the music signal or the second area 4 of the sine wave signal is designated, so that it is possible to easily cope with an auditory test or a test using a waveform measuring instrument. it can.

Moreover, the first area 3 and the second area 4
Since the interruptions 6, 6 ', the black bands 7, 7', and the fingerprints 8, 8 'are formed independently of each other, the auditory inspection and the reproduction signal waveform inspection can be performed independently. For example, there is no inconvenience that a sine wave signal is suddenly reproduced during the auditory inspection and a harsh reproduction sound is heard as before, and the inspection work is performed while feeling uncomfortable every time the harsh reproduction sound is heard. , It is possible to eliminate the disadvantage that the work efficiency is reduced. Therefore, when performing an auditory test, it is possible to prevent a harsh reproduction sound from being heard, and to prevent a sine wave signal from being reproduced during an auditory test as in a conventional test disc. This eliminates the need for troublesome track designation operations, and enables efficient inspection.

The pattern of the interruptions 6, 6 'and the black bands 7, 7' has a shape in which the width in the circumferential direction increases stepwise, and the switching position of the width is located between the music pieces. It is provided in. Therefore, since the circumferential width of the defect pattern is constant within the same music,
The defect pattern can be checked at the same width in the circumferential direction anywhere in the same music, and the defect pattern of each width can be checked step by step without specifying the recording track position.

In the above-described embodiment, the inspection disk for inspecting the reproduction capability of the compact disk player is described as an example. However, the present invention is not limited to this. For example, the reproduction capability of a magneto-optical disk device using an optical pickup is inspected. Of course, the present invention can be applied to an inspection disk.

In the above-described embodiment, the first area 3 for the music signal and the second area 4 for the sine wave signal are formed on one inspection disk. However, the present invention is not limited to this. The region or the fourth region may be provided shifted in the radial direction.

Alternatively, instead of recording a music signal in the first area 3, a silent band may be formed, and noise at the time of reproducing a defective pattern may be checked by hearing.

Instead of recording a sine wave signal in the second area 4, a random noise pattern that is not regular may be formed and the waveform of the reproduced signal may be checked.

[0042]

As described above, the test disk according to the present invention has a first area where at least a plurality of music signal recording tracks are provided on the recording surface of the test disk, and a first area other than the first area on the recording surface. Is formed separately from the second area where at least a plurality of sine wave signal recording tracks are provided, and an independent pseudo defect is formed for each area, so that each area is reproduced independently. For example, if a music signal recording track recorded in the first area is specified when performing an auditory inspection, a sine wave signal suddenly occurs during the reproduction of the music signal. Reproduction can be prevented. Therefore, the inspection work is performed while feeling uncomfortable each time the user hears the unpleasant reproduction sound, so that the inconvenience that the work efficiency is reduced can be solved. Also, in order to prevent the sine wave signal from being reproduced during the auditory inspection as in the case of the conventional inspection disk, there is no need to perform a troublesome track designation operation, and the inspection can be performed efficiently. Features such as the ability to

[Brief description of the drawings]

FIG. 1 is a plan view of an embodiment of a test disk according to the present invention.

FIG. 2 is an enlarged plan view showing a defect pattern formed on an inspection disk.

FIG. 3 is an enlarged longitudinal sectional view showing an inspection disk.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Inspection disk 2 Boundary line 3 1st area 4 2nd area 5 Defect pattern 6, 6 'interruption 7, 7' Black band 8, 8 'Fingerprint

Claims (1)

(57) [Scope of request for utility model registration] 1. A music signal recording track on which a music signal is recorded, a sine wave signal recording track on which a sine wave signal is recorded, and the music signal recording track and the sine wave signal recording track are formed to intersect. A pseudo-defect portion formed on a recording surface, wherein a first area provided with a plurality of recording tracks including the music signal recording track except for at least the sine wave signal recording track is provided on the recording surface. Forming a second area provided with a plurality of recording tracks including the sine wave signal recording track except for the music signal recording track at least in a portion other than the first area on the recording surface; A test disk in which the pseudo defect portion is formed in each of the region and the second region.