JPS62267934A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To improve processing efficiency, by forming the reflecting light of the second spot light at the peripheral position of the first spot light possible to be received from an information recording medium, and including a photoreceiving system to reproduce the bit of recording information of the information recording medium. CONSTITUTION:By driving the second light projecting system A2, the output light of a light emitting diode 2, after it is generated as parallel light by a collimator lens 10, passes through a beam splitter 8, and is converged on an optical card 3 by an objective lens 9. And on the optical card 3, the second spot light SP2 is generated so as to wrap the first spot light SP1, and the reflecting light by the second spot light SP2 passes through the objective lens 9, and is reflected by a mirror 12, then it is condensed on a photodetector 6. At the photodetector 6, the reflecting light of the second spot light SP2 at information reading positions 13 and 14 are detected by the functions of photodiodes 16 and 17 corresponding to the feeding direction the optical card 3, and the bit of recording information is reproduced, and in the reciprocating feed operation of the optical card 3, the recording and the simultaneous reproduction of the bit of information is performed on the way of either a forward moving path, or a backward moving path.

Description

[Detailed Description of the Invention] <Industrial Application Field> The present invention provides a card or the like (hereinafter referred to as an "optical card") having an information recording medium that can optically record information. Information recording (writing)
The present invention relates to an optical recording/reproducing apparatus for reproducing (reading) recorded information, and in particular, the present invention relates to an optical recording/reproducing apparatus for reproducing (reading) recorded information. Regarding a playback device.

<Prior Art> In recent years, as shown in FIG. 1, for example, as shown in FIG. (details will be described later), the first light projection system A1 has a first spot for recording information on the information recording section 4 of the optical card 3, as shown in FIG. The second light projection system A2 generates the light SPI, and the second light projection system A2 generates the first spot light SP,
A second spotlight s for reproducing recorded information immediately after the generation position of
It generates pz. In FIG. 6, reference numeral 15 denotes a track guide for following the optical system when recording and reproducing information.

In this device example, while feeding the optical card 3 in the direction indicated by the arrow in the figure, a hole-shaped information unit (referred to as a "pit") 5 is recorded using the first spot light SP.
Thereafter, a second spot S P z is generated on this pit 5, and the light receiving system B receives the reflected light. As a result, the presence or absence of the pit 5 and its length are detected, and information recorded on the optical card 3 can be reproduced at the same time as recording.

Normally, the laser diode 1 may not be able to properly record information due to aging or temperature changes, or due to the influence of dust or dirt adhering to the surface of the optical card 30, but this two-light source type According to the apparatus, since the recorded information on the optical card 3 can be monitored immediately after recording, there is an advantage that the suitability of the recorded information can be immediately confirmed.

The length of the pit 5 corresponds to either binary data rlj rOJ, and while the optical card 3 is being fed in a constant direction and at a constant speed, the laser diode 1 is turned on for a length of time corresponding to the data content. When driven and irradiated with light, pits 5 having a length corresponding to the binary data are generated.

<Problems to be Solved by the Invention> In the optical recording/reproducing device described above, the first spot light SP r by the first light projection system A1 and the second spot light SPt by the second light projection system A2 are The feeding direction of the optical card 3 is uniquely determined by the positional relationship with the optical card 3. Therefore, when recording information over multiple tracks, it is necessary to send the optical card 3 back and forth, but if information is recorded on the optical card on the outward path of the reciprocating operation, the optical card is simply fed on the return path. Therefore, there is a problem of poor processing efficiency.

In view of the above-mentioned circumstances, this invention is a novel technology that greatly improves processing efficiency by making it possible to simultaneously record information and reciprocate recorded information during the reciprocating operation of an optical card, both on the outward and return trips. The purpose of the present invention is to provide an optical recording/reproducing device.

<Means for Solving the Problems> The configuration of the present invention for achieving the above object will be explained using FIGS. 1 and 2 corresponding to the embodiment. This is an optical recording/reproducing apparatus that optically records and reproduces information while relatively moving an information recording medium, and includes a first spot light S F' 1 for generating information recording on the information recording medium. 1 light projection system At, and a second spot light S for reproducing information recorded on the information recording medium.
a second light projecting system A2 for generating P2 so as to surround the first spot light SPI; and a second light projecting system A2 capable of receiving reflected light from the information recording medium at a position around the first spot light SPt. An optical recording/reproducing apparatus is constructed by forming a light receiving system B and a light receiving system B for reproducing recorded information on an information recording medium.

<Function> When the first light projecting system A□ is driven while the optical card 3 is being fed, a first spot light S P t is generated on the optical card 3, thereby forming a pit 5 and transmitting information. recorded. Furthermore, when the second light projection system Ax is driven, the first
The second spot light S surrounds the spot light SP1 of
Pz is generated on the optical card 3, so that the information immediately after recording can be read immediately.

FIG. 2 (1) shows the relationship between each spot light spt, spz and the information reading position 13.14, and the optical card 3
When the feed direction is in the a direction, reading position 13 is selected, and when it is in the b direction, reading position 14 is selected.

Therefore, during the reciprocating operation of the optical card 3, information can be recorded and simultaneously reproduced on both the outward and return trips, and processing efficiency can be improved.

<Embodiment> FIG. 1 shows a two-light source system optical recording and reproducing apparatus according to an embodiment of the present invention.

The illustrated device includes a first light projection system A for generating a first spot light SP for recording information on the optical card 3;
On the same optical card 3, a second light emitting light 2 is generated to generate a second spot light SP for reproducing recorded information, and a reflected light of the second spot light SP2 is received from the optical card 3. It consists of a light receiving system B for reproducing recorded information on the optical card 3 immediately after recording.

The first light projecting system A uses a laser diode 1 as a light source, forms the output light of the laser diode 1 into parallel light using a collimating lens 7, and passes this parallel light through a beam splinter 8. After that, the objective lens 9 focuses the light onto the optical card 3 to generate a first spot light SPL having a diameter of about 1 μm.

Since laser light has a high energy density, it is used for information recording. When the first spot light SP1 is generated on the optical card 3, a pit 5 having a shape as shown in FIG. 6 is formed. is recorded. This pit 5 part has a lower light reflectance than other parts, and
When the second spot light SP2 is generated on the bit 5, the amount of reflected light differs depending on whether the length of the bit 5 is long or short, making it possible to determine the data content.

The second light projecting system A2 uses a light emitting diode 2 as a light source, and forms the output light of the light emitting diode 2 into parallel light using a collimating lens 10, and passes the parallel light through the beam splitter 8. After that, the second spot light S is focused on the optical card 3 by the objective lens 9.
Generate Pz.

Since the light emitting diode 2 has a large light source and its output light is not coherent light, the second spot light SP The diameter of the light SP becomes larger.

The diameter of this second spot light SPz can be further increased by using a light emitting diode 2 with a larger light emitting surface or by using a collimator lens 10 with a different focal position.

This second spot light SP2 is the same as the first spot light SP2.
The peripheral position 13.14 of the first spot light SP within this second spot light SP is set as the reading position of recorded information - this reading position 1314 is a first spot light SP with respect to the feeding direction of the optical card 3 (indicated by an arrow in the figure).

The reading position 13 is selected when the optical card 3 is fed in the direction a, and the reading position 14 is selected when the optical card 3 is fed in the direction b.

Next, the light receiving system B detects the reading position L3. After the reflected light from L4 passes through the objective lens 9 and is reflected by the mirror 11, it is converged by the condensing lens 12 and received by the light receiver 6. Based on this light reception signal, the presence or absence of bit 5 and its presence are determined. Data content is determined.

FIG. 2(2) shows the first. A received light image S'Pt' of each second spot light SPL, SP2.

SF3' is shown, and a position 13' corresponding to the reading position 13.14 in this received light image.

Photodiodes 16 and 17 are arranged at 14'. Either one of these photodiodes 16 and 17 functions depending on the feeding direction of the optical card 3, as shown in FIG. 2 (1).
Inside, the photodiode 16 is used when sending the optical card 3 in the a direction, and the photodiode 17 is used when sending the optical card 3 in the b direction.
play back the recorded information.

If the diameter of the second spot light SPz is further increased as shown in FIG. 3(1), the track guide 15 will be included within the range of the second spot light SPz.

In this case, position 18.19 indicated by the circle in Figure 3 (1) is set as the reading position of the tracking error signal, and the reflected light at this reading position 18.19 is received as shown in Figure 3 (2). The tracking error signal can be extracted by detecting it with the photodiode 20.11 at the corresponding position 18', 19' of the device 6.

FIG. 4 shows an example of a circuit configuration for extracting this tracking error signal, in which the light receiving output of each photodiode 20, 21 is input to the differential amplifier 22, and the differential output is obtained as the tracking error signal. There is.

While the optical card 3 is being fed, the first light projecting system A
When I is driven, the output light of the laser diode 1 is generated into parallel light by the collimating lens 7, and then the beam splitter
The light passes through the ivy 8 and is focused onto the optical card 3 by the objective lens 9.

As a result, a first spot light SPI is generated on the optical card 3, and this spot light SP forms a dot 5 on the information recording section 4 of the optical card 3 to record information.

Furthermore, when the second light projection system A2 is driven, the light emitting diode 2
After the output light of
is focused on the optical card 3. As a result, the second spot light SP is placed on the optical card 3 so as to surround the first spot light SP.
The second spot light SP2 is generated.
The reflected light from the spot light SP2 passes through the objective lens 9, is reflected by the mirror 12, and is focused on the light receiver 6.

In the light receiver 6, one of the photodiodes 16 and 17 functions depending on the feeding direction of the optical card 3 to detect the reflected light of the second spot light S P z at the information reading position 13 and 14, This allows the recorded information on the optical card 3 to be reproduced. Therefore, during the reciprocating operation of the optical card 3, information is recorded and reproduced simultaneously on both the outward and return trips, and the processing efficiency is improved to twice that of the conventional example.

Note that although FIG. 5 shows a state in which the irradiated light 24 to the optical card passes through the protective layer 23 and reaches the information recording medium 23, the information is collected by light with a large spot diameter like the second spot light SP2. When regenerating the protective layer 23, the irradiation area on the protective layer 23 is wide, so it is better to
It has the advantage of being less susceptible to the effects of dust and scratches.

<Effects of the Invention> Since the present invention is constructed as described above, when information is optically recorded and reproduced while moving the information recording medium relative to the light projecting system, during the reciprocating movement of the information recording medium, It is possible to simultaneously record information and reproduce recorded information both on the return trip and on the return trip, and the processing efficiency can be greatly improved, achieving the remarkable effects of achieving the purpose of the invention.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram showing an optical system of an optical recording/reproducing apparatus according to an embodiment of the present invention, and FIGS.
An explanatory diagram showing the relationship between each second spot light and the information reading position and the relationship between the received image of each spot light and the photodiode, Fig. 3 f1) (2) shows the diameter of the second spot light enlarged. FIG. 4 is an explanatory diagram showing the relationship between the first and second spot lights and the tracking error signal reading position and the relationship between the received image of each spot light and the photodiode in the case of the above case. FIG. 4 is an example of a tracking error signal detection circuit FIG. 5 is an explanatory diagram showing the state of light irradiation onto an optical card, and FIG. 6 is an explanatory diagram showing the principle of the conventional recording/reproducing system. 1... Laser diode 2... Light emitting diode A+... First light projecting system A2... Second light projecting system B... Light receiving system

Claims (4)

[Claims] (1) An optical recording and reproducing device that optically records and reproduces information while moving an information recording medium relative to a light projecting system, which generates a first spot light for recording information on the information recording medium. a first light projection system for generating a second light spot for reproducing recorded information on an information recording medium so as to surround the first light spot;
and a light-receiving system that reproduces information recorded on the information recording medium by forming the reflected light of the second spot light at the peripheral position of the first spotlight so that it can be received by the information recording medium. Recording and playback device. (2) The optical recording and reproducing apparatus according to claim 1, wherein the first light projection system uses a laser diode as a light source, and the second light projection system uses a light emitting diode as a light source. (3) Each of the first and second light projection systems includes a collimating lens that collimates the output light of the light source, and the light passing through each collimating lens sequentially passes through a beam splitter and an objective lens to the information recording medium. An optical recording/reproducing device according to claim 1 or 2, which focuses light. (4) The optical recording and reproducing apparatus according to claim 1, wherein the light receiving system uses a photodiode as a light receiving element.