JPH0950477A - Optical disk discriminating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify and miniaturize a moving part at the time of scanning by projecting and receiving the bar code reading light in the circular arc area of an optical disk panel surface from an optical fiber. SOLUTION: At the inner circumferential edge of the surface of an optical disk 1 such as a compact disk, that is, in the circular arc area 2 near a center hole 4, bar codes 3 are arrayed in a circular arc shape. This device is provided with a driving device 8 moving the tip 6 of the optical fiber member 5 connected with a code reader (a bar code reader or a bit information reader provided with laser light projecting and receiving device) 7 along the area 2 being a bar code recording area. After the positioning of the optical disk at a prescribed location by a positioning device, the driving device 8 is driven, the tip 6 of the optical fiber 5 of the code reader 7 is moved along the area 2 of the optical disk 1 at constant speed, the bar code 3 is read out and the optical disk 1 is discriminated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical disc discriminating apparatus for discriminating the contents of an optical disc such as a compact disc.

[0002]

2. Description of the Related Art Optical disks such as compact disks are
In an appropriate manufacturing process / stage, it is necessary to discriminate and sort discs in order to prevent mixing with other discs having different information and contents.

[0003] For this purpose, at the beginning of the manufacture of an optical disk, various marks for displaying the contents of the optical disk are marked on an arc-shaped area near the inner peripheral edge of the optical disk where no information pits are recorded. This mark was visually read by an operator to determine the content of the mark, and was sorted and collected.

This method has problems that it is difficult to read small characters such as engraved marks, errors are often made in discrimination, and the eyestrain of the operator is large.

In order to solve such a problem, it is known to record a bar code indicating the contents of the optical disk in the arc-shaped area. An apparatus for reading this bar code is disclosed in, for example, Japanese Patent Application Laid-Open No. 6-25118.
Issue 2 has already been proposed. This reading device is a device for reading a bar code recorded in a circular shape on a disk, wherein a laser light source that outputs laser light substantially toward the center of a disk disposed at a predetermined position, and a laser light that is output from the laser light source. A first prism that bends in the radial direction of the disk, a second prism that bends the laser beam bent by the first prism toward the barcode recording unit side of the disk, and a second prism that reflects by the barcode recording unit of the disk. A second prism and a sensor for receiving the laser beam bent by the first prism, and the first and second prisms and an objective lens for condensing the laser beam on a barcode are provided in a barcode recording section of the disc. Rotating along. With such a configuration, a bar code recorded in a circular shape is to be read.

[0006]

However, in this device, it is necessary to integrally rotate the first prism, the second prism, and the objective lens, so that the movable part becomes large and the mechanism becomes complicated. was there. In addition, the adjustment of the optical path of the reading laser beam becomes complicated, and the adjustment of the optical system of the movable portion may occur after the adjustment. In this case, there is a problem that readjustment is required.

Therefore, it is an object of the present invention to provide an optical disc discriminating apparatus capable of achieving downsizing of a movable portion, simplification of a mechanism, facilitation of adjustment and maintenance free.

[0008]

In order to achieve the above object, the optical disc discriminating apparatus of the present invention condenses reading light on the bar code of an optical disc in which bar codes are arranged in an arc-shaped area of the board. An optical fiber member that receives the reflected light, a drive device that moves the optical fiber member along the arcuate region, and a bar code of an optical disk based on the reflected light transmitted in the optical fiber member. It is characterized by having a code reader for reading.

According to this structure, the bar code reading light in the arc-shaped area of the optical disc surface is projected and received from the optical fiber, so that the movable portion during scanning is simplified and downsized.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Specific examples of embodiments of the invention will be described below with reference to the accompanying drawings. FIG. 1 is an explanatory diagram showing an outline of the optical disc discriminating apparatus of the present invention. As shown in the figure, the bar codes 3 are arranged in an arc shape on the inner peripheral edge of the surface of the optical disk 1 such as a compact disk, that is, in the arc area 2 near the center hole 4.

On the other hand, a code reader (a bar code reader or a bit information reading device equipped with a laser transmitter / receiver) 7
A driving device 8 is provided for moving the tip end portion 6 of the optical fiber member 5 connected to the above along the arcuate area 2 which is the barcode recording area.

Then, after the optical disk 1 is positioned at a predetermined position by a positioning device (not shown), the driving device 8 is driven so that the tip portion 6 of the optical fiber member 5 of the code reader 7 is moved to the arc-shaped area 2 of the optical disk 1. It moves at a constant speed along the line, scans the bar code 3, and then the optical disc 1
To determine.

FIG. 2 is a principle diagram showing the principle of an embodiment of the optical disc discriminating apparatus of the present invention.

The optical disk discriminating apparatus includes a laser light source 71 such as a semiconductor laser and a first condenser lens 51 for condensing the laser light 71a emitted from the laser light source 71 and guiding it to the incident end side of the optical fiber member 5. A polarization beam splitter 72 disposed between the laser light source 71 and the first condenser lens 51, and the polarization beam splitter 72 and the first condenser lens 5
1 and a quarter wavelength plate 73, an optical fiber 52 for transmitting the laser light 71b condensed on the incident end side by the first condenser lens 51 to the emission end side, and an optical fiber 52.
The second condensing lens 53 for condensing the laser light 71c emitted from the emission end side of the above in a spot shape on the arc-shaped region 2. The first condenser lens 51 and the optical fiber 5
The optical fiber member 5 is constituted by the second and second condenser lenses 53.

The laser light 71a emitted from the laser light source 71 passes through the polarization beam splitter 72, the quarter-wave plate 73, the first condenser lens 51, the optical fiber 52 and the second condenser lens 53. It is condensed in a spot shape on the arc-shaped region 2. Then, the emitting end 6 of the optical fiber member 5 is moved around the center of the optical disc 1 to move the barcode 3
The top is scanned with laser light.

The reflected laser light from the bar code 3 is
Condensing lens 53, optical fiber 52, first condensing lens 51
And the polarization beam splitter 72 via the quarter-wave plate 73.
Reach The light reflected by the polarization beam splitter 72 enters the light receiving element 74. The intensity of reflected light from the barcode 3 is detected by the light receiving element 74, and the information recorded on the arc-shaped area 2 is read by the code reader 7.

FIG. 3 is a perspective view showing an embodiment of the driving device. A guide rail 81 long in the X-axis direction is provided on the upper surface of a pedestal (not shown), and slides along the guide rail 81 in the X-axis direction. A sliding groove 82a that is long in the Y-axis direction orthogonal to the X-axis is provided on the upper surface of the possible saddle 82.

The light emitting end 6 of the optical fiber member 5 whose base end is connected to the code reader 7 is perpendicular to the object to be read at the tip 83a of the moving rod 83 which is slidably inserted into the sliding groove 82a. It is fixed toward the moving rod 83
A hole 83b is provided at the base end of the.

The light emitting end portion 6 of the optical fiber member 5 projects from the mount and is located above the optical disc 1 which is temporarily stopped during transportation.

A bearing 85 is fitted in a hole 84 provided in the mount, and a rotary shaft 87 protruding downward from the center of the lower surface of the rotary disc 86 is rotatably inserted into the bearing 85, and the lower end of the rotary shaft 87 is inserted. Is coupled to the output shaft of the motor 88 with a speed reducer via a coupling (not shown).

On the upper surface of the rotating disk 86, a region including the bar codes 3 arranged on the optical disk 1 from the center of rotation, that is,
An eccentric shaft 89 protruding at a position eccentric by a size substantially equal to the radius corresponding to the arcuate region 2 is provided, and the eccentric shaft 89 is rotatably fitted into the hole 83b of the moving rod 83.

Next, the drive unit 8 configured as described above.
The operation of the optical disc discriminating apparatus when using is explained.

When the optical disk 1 is positioned at a predetermined position below the tip 6 of the optical fiber member 5 by the positioning device provided in the carrier device, the motor 88 with a decelerator rotates and the eccentric shaft 89 rotates. A circular motion is performed with 87 as the center and the eccentric amount as the radius.

The circular movement of the eccentric shaft 89 is converted into a linear movement of the moving rod 83 in the Y-axis direction and a linear movement of the saddle 82 in the X-axis direction. Then, the movement of the tip portion 6 of the optical fiber member 5 in which the linear movements in the X-axis direction and the Y-axis direction are combined becomes a circular movement at a constant speed equal to the circular movement of the eccentric shaft 89. By scanning in this manner, the optical fiber member 5
The front end portion 6 reads the bar code 3 in the arc-shaped area 2, discriminates the optical disc 1, and according to the discriminated information, detection of contamination and discrimination of the sorting destination by the sorting device are automatically and efficiently performed. Done.

Since the optical fiber member 5 does not rotate (rotate) itself during this circular movement, there is an advantage that the optical fiber member 5 is not twisted, and the optical fiber member 5 can be used for a long time. There is no possibility that 5 will be disconnected.

Since the reading mechanism attached to the tip of the movable rod 83 is the emitting end 6 of the optical fiber member 5, the movable part can be downsized and the structure of the movable part can be simplified. Further, the optical path adjustment is also performed by the light emitting end 6 of the optical fiber member 5.
It can be simplified by just positioning. Further, since the optical system of the optical transmission system of the movable part is the optical fiber member 5, it is difficult to cause the adjustment deviation and it is possible to achieve maintenance-free.

4A and 4B are perspective views showing another embodiment of the driving device, FIG. 4A being a plan view thereof and FIG. 4B being a side view thereof.

The drive device 9 of this embodiment has a driving friction wheel 91 that rotates integrally with a driving shaft 91a connected to a driving shaft 98a of a motor 98 supported by a pedestal 96, and the driving shaft 9
1a, a connecting rod 94 that rotatably supports an eccentric shaft 91b projecting on a main friction wheel 91 that is erected at a position eccentric from 1a in a hole on the base end side, and a hole at the center of the connecting rod 94. Between the driven friction wheel 91 and the driven friction wheel 93, in which the eccentric shaft 93b is rotatably attached to the driven friction wheel 91 with the same eccentricity as the eccentricity of the driving friction wheel 91. A friction wheel 92 for power transmission for transmitting power is provided.

A bearing 95 is installed in a hole 96a provided in the frame 96.
A rotary shaft 91a protruding downward from the center of the lower surface of the driving friction wheel 91 into a bearing 95 so as to be rotatable, and a lower end of the rotary shaft 91a is coupled to a motor with a reduction gear through a coupling (not shown). 98 is connected to the output shaft.

On the upper surface of the driving friction wheel 91, an eccentric shaft 91b protruding to a position eccentric from the center of rotation by a dimension substantially equal to the radius of the area including the bar codes 3 arranged on the optical disk 1, that is, the arc-shaped area 2. Eccentric shaft 91
b is rotatably fitted in the hole 94a of the connecting rod 94.

A rotary shaft 93a protruding downward from the center of the lower surface of the driven friction wheel 93 is rotatably inserted into a bearing 97 provided on the pedestal 96 side similarly to the main friction wheel 91.
On the upper surface of the driven friction wheel 93, an eccentric shaft 93b is provided which protrudes at a position eccentric with the same amount of eccentricity as the main friction wheel 91. This eccentric shaft 93b has a hole 94 at the center of the connecting rod 94.
It is rotatably fitted in b.

The tip of the connecting rod 94 projects from the mount 96 and is located above the optical disc 1 which is temporarily stopped during transportation. Further, the light emitting end 6 of the optical fiber member 5 is fixed vertically to the reading target.

Next, the drive unit 9 configured as described above.
The operation of the optical disc discriminating apparatus when using is explained.

When the optical disk 1 is positioned at a predetermined position below the tip 6 of the optical fiber member 5 by the positioning device provided in the carrier device, the motor 98 with a speed reducer rotates and the eccentric shaft 91b rotates. A circular motion is performed with 91a as the center and the eccentric amount as the radius.

The rotary motion of the main friction wheel 91 is transmitted to the power transmission friction wheel 92, and is transmitted from the power transmission friction wheel 92 to the driven friction wheel 93. Therefore, the main friction wheel 91 and the driven friction wheel 93 rotate in synchronization.

The circular movement of the eccentric shaft 91b is transmitted to the eccentric shaft 93b via the connecting rod 94, and the eccentric shaft 93b is rotated by the rotating shaft 9.
A circular motion is performed with the eccentric amount as the radius with 3a as the center. At this time, since the driven friction wheel 93 and the driven friction wheel 93 rotate in synchronization with each other, the dead center can be avoided.

As described above, the movement of the tip portion 6 of the optical fiber member 5 fixed to the tip of the connecting rod 94 by the main friction wheel 91 and the driven friction wheel 93 and the like is equal to the circular movement of the eccentric shaft 91b. It becomes a circular motion of speed. By scanning in this way, the tip 6 of the optical fiber member 5 reads the bar code 3 in the arc-shaped region 2, discriminates the optical disc 1, and based on the discriminated information, it is possible to detect contamination or to use a sorting device. The sorting destination is automatically and efficiently determined.

Also in this embodiment, similar to the above embodiment,
Since the optical fiber member 5 does not rotate (rotate) itself during this circular movement, there is an advantage that the optical fiber member 5 is not twisted, and the optical fiber member 5 is disconnected even if the optical disc discriminating apparatus is used for a long time. There is no danger of

Further, since the reading mechanism attached to the tip of the connecting rod 94 is the emitting end 6 of the optical fiber member 5, the movable portion can be downsized and the structure of the movable portion can be simplified. Further, the optical path can be adjusted simply by positioning the emitting end of the optical fiber member 5. Further, since the optical system of the optical transmission system of the movable part is the optical fiber member 5, it is difficult to cause the adjustment deviation and it is possible to achieve maintenance-free.

In this embodiment, a power transmission mechanism including a main driving gear, a power transmission gear and a driven gear may be used instead of the power transmission mechanism including the main friction wheel, the power transmission friction wheel and the driven friction wheel. Alternatively, a power transmission mechanism including a main driving pulley, a driven pulley, and a power transmission belt may be used.

In the above embodiment, the optical fiber member 5 is manufactured by Hoya-Schott Co., Ltd. under the product name L.
Although B66 (numerical aperture of 0.66) was used, other optical fiber members may be used.

[0042]

As is apparent from the above description, according to the optical disc discriminating apparatus of the present invention, the reading light is condensed on the bar code of the optical disc in which the bar codes are arranged in the arc-shaped area of the board and the reflection thereof is performed. An optical fiber member for receiving light, a drive device for moving the optical fiber member along the arcuate region, and a code for reading a bar code of an optical disk based on the reflected light transmitted in the optical fiber member. Since the reader is provided, it is possible to reduce the size and weight of the movable part, simplify the moving mechanism, facilitate the adjustment, and achieve maintenance-free operation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an outline of an optical disc discriminating apparatus of the present invention.

FIG. 2 is a principle diagram showing the principle of an embodiment relating to the optical disc discriminating apparatus of the present invention.

FIG. 3 is a perspective view showing an embodiment of a driving device.

FIG. 4 is a perspective view showing another embodiment of the driving device,
(A) is the top view, (b) is a side view.

[Explanation of symbols]

 1 Optical Disc 2 Arc-Shaped Area 3 Bar Code 4 Center Hole 5 Optical Fiber Member 6 Tip Part 7 Code Reader 8 Drive Device 9 Drive Device

Claims (1)

[Claims] 1. An optical fiber member for condensing reading light on the bar code of an optical disk in which bar codes are arranged in an arcuate region of a board surface and receiving reflected light thereof; and the optical fiber member having the arcuate shape. An optical disc discriminating device comprising: a drive device for moving the optical disc member along the area of 1. and a code reader for reading a bar code of the optical disc based on the reflected light transmitted in the optical fiber member.