WO2013086940A1

WO2013086940A1 - Compact disk reading device

Info

Publication number: WO2013086940A1
Application number: PCT/CN2012/085788
Authority: WO
Inventors: 鞠怡明
Original assignee: 苏州科雷芯电子科技有限公司
Priority date: 2011-12-12
Filing date: 2012-12-04
Publication date: 2013-06-20
Also published as: CN102682804A; CN102682804B

Abstract

Disclosed is a compact disk reading device and the present invention aims at disclosing a compact disk reading device adopting a camera. The compact disk reading device comprises a bracket, a driving motor, a control circuit and a moving arm. The bracket is connected with the driving motor, the compact disk reading device also comprises a microscope camera, a light source and an image processor, the microscope camera is arranged on the moving arm and can move along the moving arm under the control of the control circuit, and the image processor is electrically connected with the microscope camera. When a compact disk is placed on the bracket, the shooting direction of the microscope camera is right aligned with the reading surface of the compact disk, and light rays generated by the light source are uniformly irradiated on the reading surface of the compact disk. The microscope camera shoots the surface of the compact disk, and then, information recorded by a compact disk channel is recognized by adopting the machine vision technology. The present invention is suitable for reading all compact disks.

Description

Optical disc reading device

The present invention relates to an optical disk reading apparatus, and more particularly to an optical disk reading apparatus using a camera.

Background technique

The use of optical discs is very common, such as DVD, VCD, CD-ROM, DVD-ROM and so on. A disc is a recording medium for information, and a corresponding disc player is a tool for storing and reading information on a disc. The disc is placed on a tray that has a recess for easy placement and securing of the disc. There is a sliding track above the disc, and the laser head slides on the track for reading information on different tracks on the disc, and the disc rotates inside the tray. The control circuit controls the operation of the laser head, the moving arm, and the optical disc.

The information is burned on the disc. Reading of disc information (most discs are read-only) By laser head, laser light is applied to the uneven channel on which the information is recorded on the surface of the disc. Where there is a pit, a diffuse reflection occurs after laser irradiation, and a place without a pit is totally reflected. There is a photosensitive tube on the laser head that is responsible for receiving these reflected light. This achieves the purpose of recording information on an optical disc. Although the use of optical discs is very popular, it contains a lot of high technology. For example, the laser head should ensure that the laser can be accurately focused on the surface of the disc, but because the disc itself is not absolutely flat, the disc that rotates during the operation of the disc fluctuates up and down. And because the disc rotates very fast, its speed fluctuates up and down quickly. This requires the laser head to have a mechanism that can determine the degree of fluctuation of the disk up and down, and fine-tune the distance between the laser head and the surface of the disc in real time. For example, the capacity of the optical disc is now large, and one disc can accommodate more than 10 GB of information. And this information is recorded in a spiral information track, the distance between the information tracks is on the order of micrometers, which requires the laser head to drive the laser head to slide on it with an accuracy of the order of micrometers. This is extremely precise Machinery.

Although China has produced a large number of DVD players, such as DVD players and DVD-ROMs, the laser head technology is still in the hands of the Japanese. China is only assembled and does not master the core technology.

The National Intellectual Property Office of the Chinese People's Republic of China published the patent document with the publication number CN1755828A and the name of the optical drive on April 5, 2006. The solution described in the text includes: a casing with a venting hole; an optical reading head, set Inside the casing, for reading data on a disk; a circuit board disposed on a bottom surface of the casing, the circuit board having a driving circuit, and an area of the circuit board; and a partitioning portion disposed adjacent to the circuit board Where the driving circuit is used to separate the driving circuit from the optical pickup, the partition has a cavity communicating with the vent hole. The optical pickup in this solution is still a conventional laser type read head without substantial changes. The laser read head can only read one channel on the disc at a time, and it is difficult to increase the read speed of the optical disc by the speed of the optical disc.

Summary of the invention

The invention mainly solves the technical problem that the laser reading head can only read one channel at a time in the prior art, and provides a novel optical disc reading device capable of simultaneously reading a plurality of channels.

The present invention is directed to the above technical problems mainly by the following technical solutions: An optical disc reading device comprising a bracket, a driving motor, a control circuit and a moving arm, the bracket being connected to the driving motor, and further comprising a microscope camera a light source and an image processor, the microscope camera being disposed on the moving arm and movable along the moving arm under the control of the control circuit, the image processor being electrically connected to the microscope camera; when the optical disc is placed on the bracket, The photographing direction of the microscope camera is directly opposite to the reading surface of the optical disc, and the light source generates uniform light to be irradiated onto the reading surface of the optical disc.

Preferably, the microscope camera can simultaneously read a plurality of channel information, and splicing the plurality of channel information together by the image processor to make the reading speed multiplied by the conventional optical disk drive. Preferably, the microscope camera is a microscope camera with adjustable focal length, and the speed of focusing can keep the focus within the field of view of the lens, and it is not necessary to accurately focus on the surface of the optical disk like the laser head.

Preferably, the light source is an LED light-emitting diode, and has a certain inclination angle with the reading surface of the optical disk, so as to facilitate the image of the disk channel irregularity.

Preferably, the microscope camera is fixed on a movable arm that can be moved, and the precision of the movement of the microscope camera is more than 10 channels, which is much lower than the precision of the laser head.

The focus of the microscope camera is within the field of view of the camera, not necessarily on the centerline of the camera.

The present invention employs a microscope camera as an information extraction tool. It captures the surface of the disc and then uses the machine vision technology to identify the information recorded on the disc channel. It can be seen from this that the solution bypasses the problem of laser technology and uses another method to read the information recorded on the optical disc. This solution has its own advantages in dealing with the problem of precise movement of the slide rail and the focus of the information read head:

First, because the camera has a wide viewing range, not only one track is included, but multiple tracks appear simultaneously in the camera's viewing range. This makes the accuracy of the slides less precise than the laser method, thus reducing the dependence on precision machinery.

Second, as shown in Fig. 2, since the field of view of the camera is relatively wide, the requirements for focusing are not necessarily strict. As shown in the figure, when the focus is not in focus in the vertical direction, the focus on the side may be accurate. This results in an accurate focus portion within the field of view of the camera. Using this part, you can clearly read the data. The problem of inaccurate focus points caused by fluctuations in the disc can be solved by software to select the position of the focus point, so that the precise mechanical problem becomes a software problem. This reduces the need for the read head to closely follow the disc. Third, since the camera can read multiple channels at the same time, the camera can be used as a read head to read information at multiple speeds.

DRAWINGS

Figure 1 is a schematic view of an internal structure of the present invention;

Figure 2 is a schematic view of a focal length of the present invention;

In the figure: 1, moving arm, 2, microscope camera, 3, CD, 4, bracket.

detailed description

The technical solutions of the present invention will be further specifically described below by way of embodiments and with reference to the accompanying drawings. Embodiment: An optical disc reading apparatus of this embodiment includes a bracket 4, a driving motor, a control circuit, and a moving arm 1. The bracket is connected to a driving motor, and further includes a microscope camera 2, a light source, and an image processor, and an internal structure As shown in Fig. 1, the microscope camera is disposed on the moving arm and can be moved along the moving arm under the control of the control circuit, and the image processor is electrically connected with the microscope camera; when the optical disc 3 is placed on the bracket, the shooting direction of the microscope camera is positive On the reading surface of the optical disc, the light of the light source is uniformly irradiated onto the reading surface of the optical disc. The microscope camera is a high-magnification lens with adjustable focal length, and the light source is an LED light-emitting diode. The light source has a certain inclination angle with the reading surface of the optical disc. The microscope camera is fixed on a movable arm that can be moved. The accuracy of the microscope camera movement is 10 channels or more.

The microscope camera passes the image captured by the optical disk to the image processor, and the image processor processes and reads the data stored on the optical disk. Since the microscope camera can read multiple channels at the same time and splicing multiple channel information together through the image processor, the same disk speed can have multiple reading speeds, or only need to be much smaller than the speed of the laser optical drive. The reading speed of the laser disc drive can be reached or exceeded. The microscope camera is a high-speed camera with a shooting speed of 10,000 frames per second or more. The specific embodiments described herein are merely illustrative of the spirit of the invention. A person skilled in the art can make various modifications or additions to the specific embodiments described, or in a similar manner, without departing from the spirit of the invention or as defined by the appended claims. The scope.

Although the term "microscope camera, moving arm" is used more often in this document, the possibility of using other terms is not excluded. These terms are only used to describe and explain the nature of the invention more conveniently; it is inconsistent with the spirit of the invention to interpret them as any additional limitation.

Claims

Rights request

An optical disk reading device comprising a carriage, a drive motor, a control circuit and a moving arm, the bracket being coupled to a drive motor, further comprising a microscope camera, a light source and an image processor, the microscope camera Provided on the moving arm and movable along the moving arm under the control of the control circuit, the image processor is electrically connected to the microscope camera; when the optical disc is placed on the bracket, the shooting direction of the microscope camera is directly opposite to the reading surface of the optical disc The light source generates uniform illumination of the light onto the reading surface of the optical disc.

The optical disk reading apparatus according to claim 1, wherein said microscope camera can simultaneously read a plurality of channel information, and splicing a plurality of channel information together by an image processor.

The optical disk reading apparatus according to claim 1 or 2, wherein the microscope head is a microscope camera of adjustable focal length.

The optical disk reading apparatus according to claim 1 or 2, wherein the light source is an LED light emitting diode and has a certain inclination angle with respect to the disk reading surface.

The optical disk reading apparatus according to claim 1, wherein the microscope camera is fixed to a movable arm that can be moved, and the accuracy of movement of the microscope camera is 10 channels or more.