JPH0658884A - Print face inspecting apparatus - Google Patents

Abstract

PURPOSE:To determine good/bad of print face easily even for a plurality of optical discs of different type. CONSTITUTION:The print face inspecting apparatus comprises an input unit 12 for fetching data from a print face, means 23 for storing data on a plurality of types of reference print faces 11a as reference data corresponding to the plurality of types of print faces, and a section 25 for comparing data from the memory means and the print face 11a to be inspected with reference data (master data) corresponding to the print face to be inspected thus inspecting a plurality of print faces.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a printing surface inspection apparatus which is suitable for use when judging the quality of a printing surface printed on one surface of an optical disk or the like.

[0002]

2. Description of the Related Art One of both surfaces of an optical disk is a surface on which an information signal is written or is a surface to be written, and the other surface is printed with index information indicating what kind of information signal is written. The printed surface is made.

In a factory, various information may be printed directly on one surface of an optical disc, and in this case, a printing surface inspection device may be provided to automatically check whether or not the information is correctly printed immediately after printing. .

The printing surface inspection apparatus picks up an image of each printing surface of the optical disk, which is the inspection object sent to the inspection line of the factory, by using an input device (imaging means) such as a video camera, and the image thereof. The data (target data) is compared with the reference image data (master data) to judge the quality (pass / fail) of printing.

In order to inspect the printing surface of an optical disk, first, an optical disk having a standard printing surface is imaged to obtain reference data, which is stored, and then an optical disk to be inspected is imaged one by one. Then, a quality check is performed.

Therefore, if the optical disk to be inspected changes, the reference data used must be changed accordingly.

[0007]

Conventionally, every time the optical disc print surface is inspected, standard data is stored using a standard optical disc and an image input device, and then the optical disc to be inspected is made to flow to an inspection line. There is. Therefore, when inspecting the printing surfaces of a large number of optical discs of different types, the master data must be loaded every time the types change, and the inspection processing efficiency is poor.

Even when one type of optical disk is made to flow in one inspection line, there is a problem that when there are several inspection lines, it is necessary to prepare as many printing surface inspection devices as there are inspection lines. is there.

Therefore, the present invention solves the conventional problems as described above, and proposes a printing surface inspection apparatus capable of improving inspection efficiency.

[0010]

In order to solve the above problems, according to the present invention, data capturing means for capturing data on a printing surface, and data for a plurality of types of reference printing surfaces from the capturing means. A storage means for storing as a reference data of a type corresponding to the plurality of types of printing surfaces, and data of a printing surface from the inspection printing surface corresponding to the inspection printing surface read from the storage means. An inspection means for inspecting the print surface to be inspected in comparison with the reference data is provided.

[0011]

As shown in FIG. 1, image data (master data) of each printing surface is fetched by the printing surface inspection unit 20 and stored in the storage medium 23 using a standard optical disk among a plurality of different kinds of optical disks. Is stored.

After storing all the master data, the printing surface inspection process is started. The image data (target data) of the optical disk to be inspected is the target data memory 2
Stored in 1 and temporarily saved. At the same time, of the master data stored in the storage medium 23, the master data corresponding to the optical disc to be inspected is read and stored in the master data memory 22.

Next, the inspection unit 25 performs the collation process of the target data and the master data and the quality judgment process, and the result is displayed on the display unit 26.

When inspecting the printing surfaces of different types of optical disks, the master data corresponding to them are stored in the storage medium 2.
The print surface inspection process is performed after changing the master data read from the data No. 3 and temporarily stored in the master data memory 22.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a case where an example of the printing surface inspection apparatus according to the present invention is applied to the above-described printing surface inspection of an optical disk will be described in detail with reference to the drawings.

FIG. 1 shows a printing surface inspection apparatus 10 according to the present invention.
An example of applying the method to a print surface inspection of an optical disk is shown.

In the figure, 11 is an optical disk,
11a is the printing surface. The surface opposite to the printing surface 11a is an information reading surface on which various information is recorded. Print side 11
Reference numeral a is a label of recorded information, on which various index information such as music and playing time is directly printed, for example.

The image information on the printing surface 11a is read by the input device 12 such as a video camera and converted into image data.

The input device 12 may be composed of one video camera or a plurality of video cameras. When a plurality of, for example, four video cameras are used, the sharing area of the printing surface 11a is determined as shown in FIG. In the figure, it is divided into four areas Sa to Sd, and the corresponding video cameras share the respective areas. The shaded area is not used even if it is captured as an image. This is because it is not the printing surface 11a.

When the image sharing area of the printing surface 11a is divided into four, the image data in each area is sequentially printed surface inspection unit 2
It will be taken into 0. As the image data, as will be described later, image data of the printing surface printed on a standard optical disk (master data) and image data of the printing surface printed on the optical disk to be inspected (target data)
There is.

The image data is supplied to the printing surface inspection unit 20 and collated with the master data to judge whether the printing is good or bad.

Of the image data supplied from the input device 12, the master data is transferred to the storage medium 23 via the target data memory 21 and the master data memory 22 which function as data holding means and is stored therein. The storage medium 23 is a storage medium for master data, and can store master data of each printing surface on a plurality of optical discs of different types. As the storage medium 23, a floppy disk or other medium having a large recording capacity can be used.

When recording the master data, the master data can be easily managed by constructing the image data according to the format shown in FIG. 3 and storing the image data in the storage medium 23. A system controller 24 composed of a CPU when constructing a data format
It is performed under the intervention of.

An example of the data format is shown in FIG.
As shown in the figure, when the image data taken in from the input device 12 is stored in the storage medium 23, the frame ID, date, inspection parameter, image conversion table, etc. are added.

The frame ID is information indicating the type of master data, that is, the type of optical disc. The date is the date and time stored in the storage medium 23 as master data, and is attached by using the clock function of the system controller 24. The inspection parameter is a parameter that is required in the inspection process although it is not referred to when the master data is fetched.
Since it may be customized during the inspection, the default value is set at the time of master data acquisition assuming this case.

The inspection parameters include: i) criteria for determining non-defective products and defective products ii) threshold values in binarization processing iii) outer and inner diameters of masks that specify the inspection range.

The mask sets only the printing surface 11a of the optical disk 11 into the inspection range, and when four input devices 12 are used, it becomes as shown in FIG. 2 as described above. The image conversion table is a table for converting image data used in the print surface inspection. It can be customized in the same way as the inspection parameters, in which case default values are set when master data is acquired.

The image data is a value representing the lightness and darkness of the printing surface, and in this example, it is assigned to a value of -128 to +127. Pixels on the printing surface used are, for example, 480 vertically.
The number of pixels is 512 pixels horizontally.

When the master data is stored, the input device 12
The data group shown in FIG. 3 is added to the grayscale image data from, and the data is stored and held in the allocation area of the storage medium 23 determined by the frame ID.

The master data acquisition operation is performed before entering the inspection mode, but the master data of the same type can be retaken from the inspection mode or replaced with another type of master data.

Although not shown in FIG. 1, the optical disc 1
A signal transmission system is provided between the input device 12 and the printing surface inspection unit 20 for notifying the system controller 24 of whether 1 is conveyed on the inspection line to a position right below the input device 12. .

At the time of inspecting the printing surface, master data corresponding to the inspection optical disk is read from the storage medium 23 and stored in the master data memory 22, and at the same time, the printing surface of the optical disk to be inspected output from the input device 12 is outputted. Image data of memory 2 as target data
Stored in 1. The master data and the target data are supplied to the inspection unit 25, where they are collated and a quality determination process is performed. For the matching process, a pattern matching method or the like can be used, and the quality result (inspection result) is monitored by the monitor 2.
6 is displayed. These series of processes are also performed under the intervention of the system controller 24.

FIG. 4 is a flow chart showing an example of the print surface inspection process. First, master data is captured and recorded. Therefore, the standard optical disk is identified in step 31, and a frame ID peculiar to the optical disk is added. When the identification of the optical disk 11 is completed, the image data of the print surface is input to the print surface inspection unit 20 by the input device 12.
3 and performs format conversion processing such as date addition shown in FIG. 3 and then transfers this to the storage medium 23 as master data to store it (step 32,
33).

When this processing is performed for each standard optical disk of a different type and the recording processing of all master data is completed (step 34), the printing surface inspection processing is started.
Therefore, after the frame ID of the optical disc to be inspected is first determined, the frame ID and the target data are stored in the target data memory (steps 35 to 35).
36).

Next, referring to the frame ID of the optical disk under test stored in the target data memory 21, the master data of the optical disk under test stored in the storage medium 23 is read, and this is the master data. It is stored in the memory 22 (step 37).
Then, the image collating process and the pass / fail judgment process are performed using both data, and the result is stored or displayed on the monitor 26 (step 38).

This series of print surface inspection processing is performed on all the optical discs to be inspected. In the case of optical discs to be inspected of different types, the master data corresponding to the frame ID is again stored in the storage medium 23. Be lead,
The inspection process is continued based on the master data (step 39).

In the above description, when the image capturing area of the printing surface 11a is divided into a plurality of areas, the inspection process can be performed for each image capturing area. At this time, the master data is read all at once corresponding to all areas and stored in the master data memory 22. When the image capturing area is divided into a plurality of areas, an input device 12 such as a video camera may be installed corresponding to each area. In this case, since the resolution of each area is improved, the inspection accuracy is improved accordingly.

FIG. 5 shows an example of an inspection apparatus capable of executing respective print surface inspections on a plurality of disks to be inspected flowing on a plurality of inspection lines almost simultaneously in time.

As shown in the figure, each inspection line 40A, 40
B ... 40N on the input devices 12A and 12B, respectively.
..12N installed, and inspection lines 40A, 40 respectively
B, ... Optical discs 11A, 11 flowing on 40N
The image information of the printing surface of B, ..., 11N is read and stored in the corresponding area of the target data memory 21 provided in the inspected portion 20. At this time, each master data stored in the storage medium 23 is also transferred to the master data memory 22. Then, the printing surface inspection process is sequentially performed one by one.

According to this structure, it is possible to inspect the printed surface of the optical disk substantially at the same time. In FIG. 5, the positions of the input devices 12A, 12B, ... 12N on the inspection line may be slightly shifted, and the inspection processing may be executed by mutually shifting the image capturing timing by a predetermined time. The predetermined time may be a time sufficient to perform the inspection process on one optical disk. The printing surface is not limited to the optical disc, and may be a disc medium such as a CD or a CD-ROM.

[0041]

As described above, according to the present invention,
The master data corresponding to a plurality of optical disks is recorded in a recording medium in advance, and the corresponding master data is read and used when necessary.

According to this, it becomes possible to perform the inspection more efficiently than when the master data of the optical disc is read and inspected every time the type of the optical disc changes.

Further, by attaching identification according to the type of the optical disc, any type of optical disc can be dealt with, and similarly, the inspection process can be efficiently performed.

In the case where the print surface inspection of the optical discs flowing on a plurality of inspection lines is supplied to the common print surface inspection unit to sequentially inspect each print surface in a time-division manner,
It has a feature that the configuration of the printing surface inspection apparatus itself can be simplified.

[Brief description of drawings]

FIG. 1 is a system diagram of a main part of a printing surface inspection apparatus according to the present invention.

FIG. 2 is a diagram illustrating an example of capturing an image of a print surface.

FIG. 3 is a diagram showing an example of a format of master data.

FIG. 4 is a diagram illustrating an example of a print surface inspection processing flow.

FIG. 5 is a configuration diagram showing another example of the printing surface inspection apparatus according to the present invention.

[Explanation of symbols]

 10 Printing Surface Inspection Device 11 (11A to 11N) Optical Disk 11a Printing Surface 12 (12A to 12N) Input Device 20 Printing Surface Inspection Unit 21 Target Data Memory 22 Master Data Memory 23 Storage Medium 24 System Controller 26 Monitor

Claims (3)

[Claims] 1. A data capturing means for capturing data of a printing surface, and a storage for storing data of a plurality of types of reference printing surfaces from the capturing means as reference data corresponding to the plurality of types of printing surfaces. A printing surface inspection having means and an inspection means for inspecting a plurality of printing surfaces to be inspected by comparing data on the printing surface from the printing surface to be inspected with reference data corresponding to the printing surface to be inspected. apparatus. 2. A data fetching means for fetching data on the print surface to be inspected, a data holding means for the print surface to be inspected which holds data on the print surface to be inspected by the fetching means, and a plurality of types of printing as reference. Storage means for storing surface data as reference data corresponding to the plurality of types of print surfaces; reference data holding means for holding reference data corresponding to the inspection print surface; A printing surface inspecting apparatus, comprising: an inspecting unit that inspects a plurality of inspected printing surfaces by comparing with reference data. 3. The printing surface inspection apparatus according to claim 1, wherein the printing surface is an optical disk.