JPS6386124A - Device for handling optical recording medium - Google Patents

Abstract

PURPOSE:To speed up reading out by making recording by using laser light of a laser diode, executing tracking by photoelectric converting means by using the light of an LED array and reading out data of plural tracks simultaneously at the time of reproducing. CONSTITUTION:Laser light L of the laser diode 11 and the light l of the LED array 21 are projected to an optical recording medium 10 by an optical system. The data is recorded in the recording tracks by the projection of the light L and the reflected light of the medium 10 by the projection of the light lis imaged through the optical system on the photoelectric converting means 23. The means 23 is formed of two photoelectric converters for tracking provided in contrast with the tracking line of the medium 10 and photoelectric converter for data reading out provided separately so as to correspond to the tracks. Since the reflected light of the medium 10 is imaged on the means 23 in the above-mentioned manner, the tracking control is executed and the data of the plural track arrays are simultaneously read out. The reading out of the data at a high speed is thereby permitted.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) This invention relates to an optical recording medium such as an optical memory card that records or reproduces data using laser light or the like. related to handling equipment.

(Prior art) In recent years, data has been recorded by forming holes called pits on the optical recording surface of an optical memory card using laser beams, changing the phase of magnetism, etc., or changing the optical recording surface of the optical memory card. Research and development are being conducted on processing devices that reproduce data by imaging reflected light or transmitted light from.

For example, a third optical memory card handling device is used.
The configuration is as shown in the figure. That is, a laser beam generated from a laser diode (semiconductor laser) 1 is irradiated via a beam splitter 2 and an objective lens 3 onto a data recording area called a track provided parallel to the optical recording surface of an optical memory card 4. Ru. By irradiating the laser beam, data is recorded (written) by forming holes called pits in the track.

In addition, when reproducing data, the laser diode 1 is used as a light source, and by irradiating the optical recording surface of the optical memory card 4 with a laser beam whose output is lower than that during recording, the reflected light from the track is transmitted to the imaging lens. 5 and is imaged onto a photodetector 6. By forming an image of this reflected light, the photodetector 6 outputs a signal corresponding to the pit pattern (data pattern), thereby reproducing (reading) the data.

By the way, in the above-mentioned optical memory card handling device,
Data is recorded or reproduced using a pair of laser diodes and a photodetector. Therefore, such conventional optical memory card handling devices have a disadvantage in that the data reading speed is slow during playback.

(Problems to be Solved by the Invention) This invention has the drawback that data is recorded or reproduced using a pair of laser diodes and a photodetector, so the data readout speed during reproduction is slow. It is an object of the present invention to provide an optical recording medium handling device that can remove data and read data at high speed.

[Structure of the Invention] (Means for Solving the Problems) The optical recording medium handling device of the present invention records data on a plurality of recording tracks formed in parallel to a tracking line provided on an optical recording surface. For optical recording media,
In an optical recording medium handling device for recording or reproducing data, a first light source that generates coherent light, a second light source that generates incoherent light, and at least two photoelectric conversion elements are arranged on the tracking line. and a photoelectric conversion means in which photoelectric conversion elements for data reading, which are different from the photoelectric conversion elements for tracking, are arranged corresponding to a number of recording tracks,
The data record 111t performs tracking using the light from the second light source and the signal from the photoelectric conversion element for tracking of the photoelectric conversion means, and also performs tracking using the light from the second light source.
Data is recorded using light from the second light source, and when data is reproduced, tracking is performed using the light from the second light source and a signal from the photoelectric conversion element for tracking of the photoelectric conversion means. The structure is such that data on one or more trucks can be read out simultaneously using photoelectric conversion elements for data reading.

(Function) This invention provides the second light jl! when reproducing data. : Tracking is performed using the light from j and the signal from the photoelectric conversion element for tracking of the photoelectric conversion means, and
Data on a plurality of tracks can be read out simultaneously using a data reading photoelectric conversion element different from the tracking photoelectric conversion element.

(Example) An example of the present invention will be described below with reference to the drawings.

1 and 2, the laser diode (first
The laser light generated from the light source (light source) 11 or the light l generated from the light emitting element (LED) array (second light source) 21 is transmitted through the lens 12, the polarizing beam splitter 13,
The light is irradiated onto an optical memory card (optical recording medium) 10 via a λ/4 plate 14 and an objective lens 15. Above λ/4 plate 1
4 changes the laser light or light guided by the polarizing beam splitter 13 from linearly polarized light to circularly polarized light.

By irradiating the circularly polarized laser beam, pits 17 are formed in the tracks (recording tracks) 16 of the optical memory card 10, thereby digitally recording data.

Further, the reflected light from the optical memory card 10 due to the irradiation of the light changed to the circularly polarized light is reflected by the objective lens 15, λ/4
Photodetector array (photoelectric conversion means) 2 via plate 14, polarizing beam splitter 13, and imaging lens 22
The image is formed on 3.

The λ/4 plate 14 polarizes the reflected light from the optical memory card 10 with respect to the light l from the light emitting element array 21.
It is designed to rotate 0 degrees.

The photodetector array 23 includes each tracking line (tracking guide) of the first memory card 10.
24... Two photodetectors for tracking (light 1 is a conversion element) provided in contrast to each other 2
3a, 23b, and data reading photodetectors (
photoelectric conversion elements) 23c... are arranged in parallel in a direction orthogonal to the track 16. That is, the reflected light from the optical memory card 10 is transmitted to the photodetector.
A photodetector 23a for the tracking line 24 by being imaged onto the array 23.

Tracking control is performed based on the difference in signals from the tracks 16 and 23b.
A plurality of data strings are simultaneously reproduced by signals from the photodetectors 23c, .

Next, the operation in such a configuration will be explained.

For example, when data is recorded on the optical memory card 10, light is emitted from the light emitting element array 21. This light is transmitted through a lens 12 and a polarizing beam splitter 13.
, is irradiated onto the optical memory card 10 via the λ/4 plate 14 and the objective lens 15.

Then, the reflected light from the optical memory card 10 is imaged on the photodetector array 23 via the objective lens 15, the λ/4 plate 14, the polarizing beam splitter 13, and the imaging lens 22. As a result, the tracking photodetector 2 of the photodetector array 23
The tracking control, that is, the objective lens 1
5, or the position of the imaging lens 22 or photodetector array 23 is controlled.

In this state, laser diode 11 generates laser light that is modulated according to the data. Then, this laser light passes through the lens 12 and the polarizing beam splitter 1.
3. The light is irradiated onto the optical memory card 10 via the λ/4 plate 14 and the objective lens 15. As a result, pits 17 are placed on the corresponding tracks 16 in response to the laser beam irradiation.
By forming..., data is digitally recorded.

Furthermore, when data is reproduced from the optical memory card 10, light l is generated from the light emitting element array 21. This light passes through the lens 12, polarizing beam splitter 13, λ/4 plate 14, and objective lens 15 to the optical memory card 10.
irradiated on top.

Then, the reflected light from the optical memory card 10 is imaged on the photodetector array 23 via the objective lens 15, the λ/4 plate 14, the polarizing beam splitter 13, and the imaging lens 22. As a result, the tracking photodetector 2 of the photodetector array 23
The tracking control, that is, the objective lens 1
5, or the position of the imaging lens 22 or photodetector array 23 is controlled.

In this state, the data is read by outputting a signal corresponding to the pattern of pits 17 (data pattern) from the photodetectors 23c for reading data of the photodetector array 23 corresponding to each track 16. is played.

As mentioned above, when reproducing data, the light emitted from the light emitting element array is irradiated onto the optical memory card, and the reflected light from a plurality of tracks is read out by each photodetector. ing. As a result, a plurality of data strings can be read out simultaneously, so a large amount of data can be read out at high speed. That is, data strings can be read out from a plurality of tracks at the same time, and data can be read out at high speed.

Although the above embodiment has been described using a photodetector array as the photoelectric conversion means, the present invention is not limited to this, and a CCD type line sensor may be used, for example.

Moreover, although two photodetectors are provided as photoelectric conversion elements for tracking in contrast to each tracking line, they may be provided in contrast to at least one tracking line. As a result, optical memory cards are not limited to those in which recording tracks are separated by a plurality of tracking lines, but also those in which tracking lines are provided on the upper edge side, lower edge side, or both upper and lower edges of the optical recording surface. It can also be applied to

Further, although the explanation has been given using an optical memory card handling device as an example of an optical recording medium handling device, the present invention can also be applied to, for example, an optical disk handling device.

[Effects of the Invention] As described in detail above, according to the present invention, it is possible to provide an optical recording medium handling device that can read data at high speed.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram of an optical recording medium handling device which is an embodiment of the present invention, and FIG. 2 is a diagram showing the configuration of a photodetector array, which is an example of photoelectric conversion means, and an optical recording surface. FIG. 3, which is a diagram showing the positional relationship, is a configuration diagram showing a conventional example of an optical recording medium handling device. 10... Optical memory card (optical recording medium), 11...
Laser diode (first light source), 13... Polarizing beam splitter, 14... λ/4 plate, 16... Track (recording track), 17... Pit, 21... Light emitting element array ( second light source), 23... photodetector array (photoelectric conversion means), 23 a. 23b...Photodetector for tracking (photoelectric conversion element for tracking), 23c...Photodetector for data reading (photoelectric conversion element for data reading), 24...Tracking line. Applicant's agent Patent attorney Takehiko Suzue Figure 2

Claims (5)

[Claims] (1) In an optical recording medium handling device that records or reproduces data on an optical recording medium in which data is recorded on a plurality of recording tracks formed in parallel to a tracking line provided on an optical recording surface, A first light source that generates coherent light, a second light source that generates non-coherent light, and at least two photoelectric conversion elements are provided in contrast to the tracking line, and the tracking photoelectric conversion elements are different from each other. and a photoelectric conversion means in which photoelectric conversion elements for reading data are arranged corresponding to a plurality of recording tracks, and when recording data, the light from the second light source is used to control the tracking of the photoelectric conversion means. Tracking is performed using the signal from the photoelectric conversion element, data is recorded using the light from the first light source, and when data is reproduced, the light from the second light source is used to track the photoelectric conversion means. An apparatus for handling an optical recording medium, characterized in that the device is configured to perform tracking using a signal from a photoelectric conversion element for data reading, and to simultaneously read data on a plurality of tracks using the photoelectric conversion element for reading data. (2) The optical recording medium handling apparatus according to claim 1, wherein the first light source is a laser diode. (3) The optical recording medium handling apparatus according to claim 1, wherein the second light source is a light emitting element array. (4) The optical recording medium handling device according to claim 1, wherein the photoelectric conversion element is a photodetector, and the photoelectric conversion means is a photodetector array. (5) The optical recording medium handling device according to claim 1, wherein the photoelectric conversion means is a CCD type line sensor.