JPS61188672A - Optical recording medium reader - Google Patents

Abstract

PURPOSE:To detect a skew with high speed and accurate reading of recording information by providing a two-dimensional photo-electric converting element such as an area sensor for simultaneously reading information recorded in the two-dimensional direction on an optical recording medium. CONSTITUTION:The rays of light are irradiated from a light source 3 through a condensing lens 4 on an optical recording card 1 set on a moving body through a condensing lens 4. The reflected light is received by a two-dimensional photo-electric converting element 6A as an area sensor through an enlarging lens 5. The element 6A senses a reference line 15c and scans from left to right. Thus it is possible to read the bar code information of a track 13 formed in rows on a band 12c. from the relative intensity of the reflected light from the respective bits. At this time, the element 6A simultaneously reads the information recorded in the two-dimensional direction. In such a manner, the bar code information on the plural tracks are read simultaneously while the resolving power is set to a suitable value to make possible the skew detection and the reading of record information with the accuracy and a high speed.

Description

[Detailed Description of the Invention] (Technical Field of the Invention) This invention reads various necessary information recorded on an optical recording medium such as an optical recording card using a code formed by a combination of portions with different light reflectances. The present invention relates to an optical recording medium reading device.

[Technical disadvantages of the invention]

FIG. 3 shows an optical recording medium reading device as a background art of the present invention. This optical recording medium reading device is composed of an optical system 2 that reads information recorded on an optical recording card 1, which is an integral part of optical recording. This optical system 2 includes a light source 3 using a light emitting diode (LED) or the like, a condensing lens 4 that condenses the light from the light source 3 and irradiates it onto the optical recording card 1, and a condensing lens 4 that condenses the light from the light source 3 and irradiates it onto the optical recording card 1. It consists of a magnifying lens 5 that magnifies reflected light, and a line sensor 6 as a light receiver that receives the reflected light that passes through this magnifying lens 5. The line sensor 6 is a one-dimensional photoelectric conversion element in which a large number of charge-coupled devices called CODs are arranged linearly in a row, and the barcode information recorded on the optical recording card 1 is detected based on the strength or weakness of the reflected light. It is read based on the level of reflectance.

As shown in FIG. 4, the optical recording card 1 is provided with a stripe 11 as an information recording area on its top surface in both the longitudinal and lateral directions, and within the area of the stripe 11 there are a plurality of stages (for example, three stages). Bands 12A, 128 . . . as information recording sections are arranged in parallel along the longitudinal direction.
12G is installed. Each of these bands 12A to 12C
There are hundreds to thousands of thin and vertically elongated tracks 13 arranged in parallel. Each track 13 has several tens of bits of barcode information recorded thereon, as shown in FIG.
One bit of the barcode is approximately 10-odd μm x several μm, and the rl depends on the combination of the high and low parts of the light reflectance.
The line sensor 6 detects and reads the information as digital data of J and rOJ. The areas with low reflectivity (black areas in the diagram) are coated with a 40% reflectance shell (craft) covered with a transparent plastic capsule.
It has a structure in which the under layer with a reflectance of 6% is exposed by drilling with a beam, and the highly reflective areas (white areas in the figure) are exposed as they are without perforating the outer skin.

Further, within the stripe 11 area on the optical recording card 1, a start cliff 14 indicating the home position of the information recording area is provided at the bottom left corner of the stripe 11 area, and recording information is provided between each of the bands 12A to 12C and above and below. Reference lines 15A, 158.15G, 1 indicating separation and ri
5D is provided. These Stard Cliff 14 and reference lines 15A to 15D are connected to the track 13.
Like the low reflectance part inside, it has a structure with low reflectance. Further, each of the reference lines 15A to 15D is installed so that the starting ends and ending ends of the reference lines are alternately shifted in the horizontal direction so that the left and right sides of the adjacent lines are opposite to each other.
゛Here, the optical system 2 records information on the optical recording card 1 □
To read the , a moving body (not shown) that is driven back and forth via an endless belt by a pulse motor or the like is used.
The optical recording card 1 is set on the shuttle (shuttle)', and the optical recording card 1 is made to face the optical system 2 as shown in FIG. In this state, the optical recording card 1 is moved in a direction perpendicular to the longitudinal direction of the stripe 11 by driving the moving body, and the optical system 2 is also moved along the longitudinal direction of the stripe 11 by driving a pulse motor or the like (not shown). move in a direction parallel to the direction. In this way, while moving the optical system 2 relative to the optical recording card 1, light is reflected onto the optical recording card 1' through the light source 3 or 4 of the optical system 2 and the condensing lens 4', and the reflected light is The recorded information is detected by a line sensor 6 through a magnifying lens 5 and read. That is, first, the line sensor 6 of the optical system 2 comes to the position where it detects the start cliff 14 at the left corner of the recording card 1, as shown in FIG. Here, for example, when reading the recorded information of the upper band 12C, □Line sensor 6
After detecting the reference line 15C, it moves upward and stops at the position shown by the imaginary line in the diagram, and there, while scanning from left to right, the barcode of the track 13 arranged in the corresponding band 12C is detected. Information is read from the strength of the reflected light of each bit.
By the way, in the optical recording medium reading device described above, a line sensor 6 is provided in the light receiving section of the optical system 2, and the line sensor 6 reads each track 13 in the band one by one. At this time, the one-line sensor 6 cannot detect the skew between the optical system 2 and the optical recording card 1 due to their relative movement. If this discrepancy occurs, it will naturally become impossible to read information accurately.

For this reason, a very high-precision mechanical means is required for the movement of the two, that is, for scanning, which is troublesome to manufacture and causes high cost. Due to the relationship between the sensitivity of the in-sensor 6 and the brightness on the optical recording card 1 due to illumination,
Since the number of peats that can be read per unit time is limited, it takes a lot of time to read the tracks 13 one by one and read the necessary information.
Speeding up reading has been extremely difficult.

[Purpose of the invention]

This invention was made based on the above circumstances, and an object thereof is to provide and provide an extremely high-performance optical recording medium reading device that can detect skew and read recorded information accurately and at high speed. shall be.

[Summary of the invention-]

In order to achieve the above object, the optical recording medium reading and @setting of the present invention uses a two-dimensional photoelectric conversion element such as an area sensor that simultaneously reads and reads information recorded in two-dimensional directions on the optical recording medium. -, thereby making it possible to achieve higher reading speeds. is also courageous.

[Embodiments of the invention]

The present invention will be described below with reference to an embodiment shown in FIGS. 1, 2, and 2. Components in the drawings having the same configuration as those in FIGS. 3 to 5 described above are designated by the same reference numerals to simplify the explanation.

2A in the figure is an optical system as an optical recording medium reading device, which includes a light source 3 that irradiates light onto the optical recording card 1, a condensing lens 4 thereof, a magnifying lens 5 that magnifies the reflected light, and the magnifying lens 2A. The two-dimensional photoelectric conversion element 6A serves as a light receiver that receives the reflected light coming through the photoelectric conversion element 5. That is, the optical system 2A is provided with a two-dimensional photoelectric conversion element 6A that simultaneously reads information recorded in two-dimensional directions on the optical recording card 1 in place of the above-mentioned line sensor as a light receiver. This two-dimensional photoelectric conversion element 6A is, for example, an area sensor such as a two-dimensional COD. In other words, an area sensor configured by arranging several thousand CODs (charge-coupled devices) two-dimensionally (in both vertical and horizontal directions) and integrating them is used as a two-dimensional photoelectric conversion element 6.
I use A and Shiso.

1. The optical system 2A is placed in a state facing the optical recording card 1 set on a moving body (shuttle) as described above, and is driven by a pulse motor (not shown) or the like to drive the optical recording card 1.
It is provided to move back and forth in a direction parallel to the longitudinal direction of the restripe 11.

The optical recording card 1 is set on a movable body and is driven by a pulse motor or the like to reciprocate in a direction perpendicular to the longitudinal direction of the stripe 11 via a turntable belt.

To describe the operation of reading information on the optical recording card 1 with the optical recording medium reading device having the above-mentioned configuration, the optical system 2A faces the optical recording card 1 set on a moving body. Then, light is emitted from a light source 3 via a condensing lens 4, and the reflected light is sent to an area sensor via a magnifying lens 5.
In the state where the two-dimensional photoelectric conversion element 6A receives light, the two-dimensional photoelectric conversion element 7A first detects and detects the start cliff 14 at the bottom left corner of the optical recording card 1 as shown in FIG. I'm coming to Here, for example, the optical recording card 1 is stored. As a result, the two-dimensional photoelectric conversion element 6A moves to the upper position shown by the imaginary line in the figure, and the reference line 15
C is detected, and while scanning from left to right, the barcode information of the tracks 13 arranged in the band 12C is read from the strength of the reflected light of each pit. At this time, the two-dimensional photoelectric conversion element 6A, which is the area sensor, is C
Unlike a line sensor, which has a configuration in which ODs are arranged linearly in a vertical line, it is configured by arranging a large number of CODs in two-dimensional directions. A range of information recorded over the entire range is read simultaneously. That is, among the many tracks 1-3 arranged in the band 12C, the barcode information of a plurality of tracks is read simultaneously.

Such multiple tracks 13... can be detected simultaneously 2
In the case of the dimensional photoelectric conversion element 6A, if a skew occurs with respect to the optical recording card 1 while scanning the band 12C,
Since the two-dimensional photoelectric conversion element 6A detects the reference lines 15C and 15D located above and below the band 12C in an oblique state, the skew can be detected. By setting the resolution of the two-dimensional photoelectric conversion element 6A on the optical recording card 1 to an appropriate value, it is possible to detect the degree of skew, and by reading and feeding back the correct digital data, it is possible to detect the degree of skew. Skew correction is possible.

In addition, the two-dimensional photoelectric conversion element 6A, which is the above-mentioned area sensor,
In this case, even if the sensitivity per abbreviation of a large number of C0Ds to be incorporated is equal to that of a conventional line sensor, the sensitivity of multiple tracks in the above band 12C is higher than that of a line sensor that reads tracks 13 one by one. 1
Since the barcode information of 3... is read simultaneously, the number of read bits per unit time can be increased, and the reading speed of necessary recorded information can be significantly increased.

It should be noted that the present invention is not limited to the above-mentioned embodiments. For example, the two-dimensional photoelectric conversion element 6A as a light receiver may include a plurality of line sensors arranged in parallel in addition to the area sensor such as the two-dimensional COD described above. It is also possible to use a combined area sensor, and in place of the above COD area sensor, it is also possible to use a light receiver configured by two-dimensionally arranging a large number of pin photodiodes, etc. In either case, the same effects as those of the above embodiments can be obtained.

Of course, various modifications can be made without departing from the gist of the Ikemizu invention.

〔Effect of the invention〕

According to the present invention described above, since it is equipped with a two-dimensional photoelectric conversion element such as an area sensor that simultaneously reads information recorded in two-dimensional directions on an optical recording medium, it is possible to detect skew and create a highly accurate scanning mechanism. This makes it possible to reduce costs and provide an extremely high-performance optical recording medium reading device that can read recorded information accurately and at high speed.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing one embodiment of the present invention, and FIG.
The figure is a plan view showing the relative movement with the optical recording medium in the same embodiment, FIG. 3 is a schematic configuration diagram showing a conventional optical recording medium reading device, and FIG. 4 is the relative movement of the conventional device with the optical recording medium. FIG. 5 is a plan view showing the movement, and FIG. 5 is a plan view showing one track in the recording area of the optical recording medium. 1... Optical recording medium (optical recording card), 2A... Optical system of optical recording medium reading device, 3... Light source, 4...
Condensing lens, 5... Magnifying lens, 6A... Two-dimensional photoelectric conversion element (area sensor), 11... Stripe, 12... Band, 13... Track. Applicant's agent Patent attorney Takehiko Suzue Figure 1 t) A 14 Figure 3 Figure 5

Claims (5)

[Claims] (1) A reading device for reading information recorded on an optical recording medium, characterized in that it is equipped with a two-dimensional photoelectric conversion element that simultaneously reads information recorded in two-dimensional directions on the optical recording medium. reader. (2) The optical recording medium reading device according to claim 1, wherein the two-dimensional photoelectric conversion element simultaneously reads information from a plurality of parallel tracks in a stripe on the optical recording medium. (3) An optical recording medium reader according to claim 1 or 2, wherein the two-dimensional photoelectric conversion element is an area sensor configured by two-dimensionally arranging a large number of charge-coupled devices. Device. (4) The two-dimensional photoelectric conversion element is constructed by arranging a plurality of line sensors in which a large number of charge-coupled devices are linearly arranged. Optical recording medium reading device. (5) The optical recording medium reading device according to claim 1 or 2, wherein the two-dimensional photoelectric conversion element is constructed by two-dimensionally arranging a large number of pin photodiodes. .