JPH0827946B2 - Optical data file reading method - Google Patents

Description

The present invention relates to an optical data file reading system.

[Conventional technology]

The following two types of conventional optical data file reading methods have been put into practical use. One is a rotary optical disk system represented by a video disk and a digital audio disk, and the other is a static hologram memory system.

In a rotary optical disk system, a method of irradiating a recording surface of an optical disk with a laser beam, collecting the reflected light, and detecting the presence or absence of the reflected light or the presence or absence of pits on the optical disk based on its intensity is usually used. An optical system that irradiates a laser beam to a point and collects its reflected light requires mechanical drive to change the irradiation position, and at the same time, constantly rotates the optical disk for continuous high-speed data collection. I had to keep it.

In the static hologram memory system, the laser light is applied to one surface of the data recorded on the sheet in the form of the Fourier transform hologram, and the transmitted light is projected on the vidicon through the free-eye conversion lens. Was read as an image.

[Problems to be solved by the invention]

In the conventional optical data file reading method described above, in the rotary optical disk system, mechanical driving force is frequently used for rotating the disk and changing the laser beam irradiation position, and the electric power required therefor is an electronic circuit. It is much larger than the electric power required for the operation of the device, restricts the power supply for outdoor use, and the precision requirement for mechanical drive is extremely high, which causes a cost reduction. There is.

On the other hand, the static hologram memory system includes a data processing process by a Fourier transform lens on the path from laser light irradiation to data reading by a vidicon, and
Since the data format and the vidicon imaging principle are analog formats, they are not suitable for reading digital data, which has been rapidly used in recent years.

[Means for solving problems]

The optical data file reading system of the present invention is designed to emit reflected light from a digital data recording area of an optical recording medium in which digital data is recorded depending on the presence or absence of pits formed on an optical reflection surface fixed in a stationary state or the length of the pits. An optical system for condensing and forming an optical image of the digital data recording area on the focal plane, and a two-dimensional array arranged so as to collectively convert the optical image into an electric signal arranged on the focal plane. The two-dimensional photoelectric conversion means includes a plurality of photoelectric conversion elements described above, and a data processing unit that receives the output of the two-dimensional photoelectric conversion means and performs a predetermined process.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

 FIG. 1 is a block diagram of the first embodiment of the present invention.

As shown in FIG. 1, a light source 1 for irradiating light onto an optical card 6 in which optically readable data is recorded in a data recording area 7, and reflected light from the data recording area 7 are condensed to form an image. As an optical system, a lens 2, a CCD image pickup device 3 as a two-dimensional image sensor for receiving the imaged reflected light and converting the data recorded in the recording area 7 into an electric signal, and a CCD image pickup device 3, a data processing unit 4 which decodes the electric signal from 3 and performs a signal conversion process in order to interface with a subsequent circuit in a signal format, and a video display unit 5 which displays the converted data from the data processing unit 4. Including and

The optical card 6 of this embodiment is a small optical data file represented by a business card size, and the data recording method depends on the presence or absence of aluminum pits.

In FIG. 1, light is uniformly emitted from the light source 1 onto the optical card 6, the reflected light from the data recording area 7 is condensed by the lens 2, and the data is transferred onto the CCD image sensor 3 installed behind the lens 2. The surface shape of the recording area 7 is imaged. Then, for example, the recording data A existing on the data recording area 7 appears as an image A ′ on the CCD image pickup device 3, so that the CCD image pickup device 3
Detects the data on the optical card 6 depending on the intensity of the light according to the image, that is, the presence or absence of aluminum pits, by detecting the irradiation light diffusely at the aluminum pit portion and absorbing the irradiation light at the other portions, and exchanges it with an electric signal. .

An output signal from the CCD image pickup device 3 can be treated as two-dimensional data as horizontal and vertical coordinate data by self-scanning in the horizontal direction of the CCD image pickup device and sequential charge transfer for each horizontal scanning.

The data processing unit 4 converts the output signal from the CCD image pickup device 3 into coordinate data to decode the data content, and sends the pattern data prepared in advance from the decoding result to the read image display unit 5.

Since the image display unit 5 displays the pattern data in the form of a visible image, the user can visually recognize the data content.

As a method of specifying the position of the portion corresponding to the aluminum pits in the image data on the CCD image pickup device, a method of including information on the position in the recorded data and decoding it by the data processing unit can also be applied.

 FIG. 2 is a block diagram of the second embodiment of the present invention.

As shown in FIG. 2, in the second embodiment, a large number of optical card 6a can be read in _a stationary state by arranging a large number of sets of CCD image pickup device 3, lens _2a as image forming means and light source 1. imaging range of each lens 2 _a in those are arranged so as to be taken without exception data recording portion 7 _a on the optical card 6 _a.

In addition, the cover 8 directs the light from the light source 1 to the CCD image pickup device 3
To prevent the irradiation of.

Although the CCD image sensor is used as the two-dimensional image sensor in the above-described embodiments, the present invention can be applied to a MOS image sensor, a TSL image sensor, a CSD image sensor, a CPD image sensor, and a CID image sensor.

〔The invention's effect〕

As described above, according to the present invention, the combination of the optical system and the two-dimensional image sensor makes it possible to read the recorded data on the optical data file in a stationary state. Therefore, the mechanical drive required for the rotary optical disk system etc. Power and high-precision position control technology are completely unnecessary, low power consumption is possible, and the cost can be reduced. In addition, since the pixel position of the imaged data can be digitally specified in the two-dimensional image sensor, it is consistent with the recent optical recording method being a digital method such as the presence or absence of aluminum pits, and efficient data reading is possible. There is a possible effect.

[Brief description of drawings]

1 and 2 are block diagrams of the first and second embodiments of the present invention, respectively. 1 ... Light source, 2.2 _a Lens, 3 ... CCD image sensor, 4, 4
_a: Data processing unit, 5: video display unit, 6,6 _a: optical card, 7,7 _a: data recording area, 8: cover.

Claims (1)

[Claims] 1. A focal plane which collects reflected light from a digital data recording area of an optical recording medium in which digital data is recorded depending on the presence or absence of pits formed on an optical reflecting surface fixed to a stationary state or the length of the pit. An optical system for forming an optical image of the digital data recording area, and a plurality of photoelectric conversion elements arranged on the focal plane and arranged in a two-dimensional array so as to collectively convert the optical image into an electric signal. An optical data file reading method, comprising: a two-dimensional photoelectric conversion means including the following; and a data processing unit that receives an output of the two-dimensional photoelectric conversion means and performs a predetermined process.