JPS62298033A - Optical recording and reproducing device - Google Patents

Abstract

PURPOSE:To simplify a projecting system, and to reduce an adjusting work by switching a selectively a spot light of the upstream side, and a spot light of the downstream side, for recording the information, and for recording and reproduction, respectively, against the relative movement direction. CONSTITUTION:In case of recording and reproducing optically information by moving relatively an information recording medium 4 against projecting systems A1, A2, when a feeding direction of an optical card 3 is (a), a spot light SP1, and a spot light SP2 are selected as an information recording spot light, and a recording information reproducing spot light, respectively, by a control system C. In case said direction is (b), both the spot light beams are selected and switched in the opposite way, respectively. Accordingly, information can be recorded, and reproduced simultaneously in both of reciprocating feed operations of the information recording medium.

Description

[Detailed Description of the Invention] 3. 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 capable of optically recording information. This invention relates to an optical recording and reproducing device for recording (writing) information on an information recording medium and reproducing (reading) recorded information, and in particular, the present invention is directed to simplifying optical system components and adjusting the optical system. The present invention relates to an optical recording and reproducing device that aims to simplify and improve accuracy.

<Prior Art> In a typical optical recording/reproducing device, optical information is recorded on the optical card by reciprocating the optical card with respect to the optical system. In order to improve the reliability of this information recording, it is important that the information recorded on the information recording medium of the optical card be efficiently reproduced and confirmed immediately after recording using an optical system.

The conventional optical recording/reproducing device has 1
It consists of an information recording optical system using one information recording laser diode 41 as a light source, and an information reproducing optical system using two recorded information reproducing laser diodes 42 and 43 as a light source. Optical card 5 depending on each optical system
The spot light focused on the information recording medium No. 7 is
As shown in FIG. 8, three spout throats 59 are lined up in series with respect to the card movement direction. 60.61.

To explain FIG. 7 in more detail, the light beam from the information recording laser diode 41 is collimated by a collimating lens 44, passes through a beam splinter 45, and further passes through a prism 49 for dividing the optical path according to wavelength. After that, the light that has passed through the beam splitter 50 is focused onto the optical card 57 by the condensing lens 51 and is generated into an information recording spot light 59 (indicated by the black circle in the center in FIG. 8). Optical information is recorded on the information recording medium of the optical card 57.

The reflected light beam for recording information on the optical card 57 travels along the opposite optical path and passes through the condensing lens 51, and then the optical path is first changed by the beam splitter 50 and then by the beam splitter 52, and the servo signal detection system 53 and is used as a servo signal for focus tracking.

On the other hand, the lights from the recorded information reproducing laser diodes 42 and 43 are collimated by collimating lenses 46 and 47, respectively, and then passed through a beam splint 48 and taken out as lights sharing the same optical axis, and then sent to a beam splitter. 45, it travels along the same optical path as the output light from the information recording laser diode 41. The prism 49 separates the light beams into two light beams (three light beams including the information recording light beam) that travel along optical paths corresponding to the respective wavelengths. After passing through the beam splinter 50 , the condenser lens 51 converts the optical card 57 into Two recorded information reproducing spotlights 60, 61 (
In FIG. 8, the image is generated as shown by the middle white light.

The reflected light beam for reproducing recorded information from the optical card 57 passes through the condensing lens 51 via each reflected optical path, then the optical path is changed by the beam splitter 50, and further passes through the beam splitter 52 and the imaging lens 54. These are detected as optical signals by photodetectors 55 and 56, respectively. Here, of the two reflected light beams, the one on the downstream side (succeeding side) of the [7tEi recording spot light beam 59] is used as the light beam for reproducing the recorded information.

In other words, when the optical card 57 moves in the direction C in FIG.
Each will be used as a long pot light for reproducing recorded information.

<Problems to be Solved by the Invention> In the above-mentioned conventional optical recording and reproducing apparatus, a total of three separate light sources, the laser diode 41 for information recording and the laser diodes 42 and 43 for reproducing recorded information, are separately used as light sources. Due to the usage, adjustment to align the optical axes of the two recorded information reproducing laser diodes 42 and 43,
Furthermore, it is necessary to make adjustments to align the three optical axes of the information recording laser diode 41 and the recorded information reproduction laser diodes 42 and 43, making any adjustment extremely difficult and cumbersome. There was a point.

In order to solve the above problems, this invention simplifies the light source and optical system to reduce the number of light sources and parts, and also reduces the troublesome and complicated optical adjustment work such as the optical axis adjustment. The object of the present invention is to provide an optical recording/reproducing device that performs the following.

Means for Solving the Problems> The configuration of the present invention for achieving the above object will be explained using FIGS. 1 and 2, which correspond to the first embodiment.
The present invention is an optical recording and reproducing apparatus that optically records and reproduces information while moving an information recording medium relative to a light projecting system, wherein a first spot light SP is placed on the information recording medium.
.

a first light projection system A1 for generating, and one or two second spot lights SP2 arranged in series along the relative movement direction with respect to the first spot lights on the information recording medium.
a second light projection system A2 for generating the first spot light SP1 and the second spot light S;
The spot light on the upstream side (preceding side) of Pz in the relative movement direction is used as a spot light for recording information, and the spot light on the downstream side (rear, '4? side) is used as a spot for reproducing recorded information. An optical recording/reproducing device is constructed with a control system C for selecting and controlling the switching to light.6 <Operation> In FIG. 1, while the optical card 3 is being fed in the direction of arrow a, The first light projection system A connected to
, the first spot light SP appears on the optical card 3.
□ is generated, thereby forming pits and recording information.

Also, a second light projection system A2 connected to the APC drive circuit 17
When you drive the 7 light SP.

A second spotlight S is placed in series on the downstream side (following side) of
Pz is generated on the optical card 3, so that the information immediately after recording can be read immediately.

FIG. 2 shows each spot light SP on a trunk 5 provided on an information recording medium 4 on an optical card 3.

This optical card 3, which shows the focused state of SPZ, is moved in either direction of arrows a and b, and depending on the direction of movement, one of the spot lights SP, SP2 is used for information recording (black circle). (indicated by a white circle), and the other is selected for recording information reproduction (indicated by a white circle). That is, when the feeding direction of the optical card 3 is in the a direction, the control system C selects the spot light SP as the spot light for recording information and the spot light SP2 as the spot light for reproducing recorded information, and when the feeding direction is in the b direction, On the contrary, they are selected and switched.

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

The illustrated device has a first spot light SP on the optical card 3.
, a first light projection system A1 for generating, a second light projection system A2 for generating a second spot light SP2 on the same optical card 3, the first spotlight SP, and Second
A light receiving system B receives the reflected light of the spot light SP2 from the optical card 3 and extracts it as each signal; Control to select and switch to spot light? The first light projection system A1, which is composed of a fl system C, uses a laser diode 1 as a light source, and forms the output light of this laser diode into parallel light by a collimating lens 7, After the parallel light passes through the beam splitter 8, the optical path is changed according to the wavelength by the prism 9, and after passing through the beam splitter 10, it is focused on the optical card 3 by the objective lens 11. 1 spot light SP is generated.

The second light projecting system A2 uses another laser diode 2 as a light source, and forms the output light of this laser diode 2 into parallel light using a collimating lens 12, and passes the parallel light through the beam splitter 8. After passing the first
The second output light is separated from the first output light by aligning the optical axis with the output light of the light projection system A1 and further passing through the prism 9 and refracting it according to the wavelength.

This separated second output light further passes through a beam splinter 10 and is focused onto the optical card 3 by an objective lens 11, and the first spot light SP and the optical card 3 are moved. Second spot lights S P z are generated at serial positions along the direction.

Note that in this first embodiment, the first light projection system A is used.

After the optical axes of the second light projecting system A2 are once adjusted to the same optical axis, a prism 9 is used to create a difference in the optical path according to each wavelength, thereby separating two light beams. However, by not using the prism 9 and making the optical axes of the output lights of the two light projection systems have a slight angle,
It may be split into two beams.

Next, the light receiving system B receives the spot light SPt.

After the reflected light from the optical card 3 of S P 2 passes through the objective lens 11 and the optical path is changed by the beam splitter 10, the first light projection system A, (first spot light S
The reflected light from the second light projecting system Az<second spot light sp is detected as an output signal by the second detector 14.

Next, the control system C selects and switches the first light projection system A1 and the second light projection system A2 for information recording or recorded information reproduction based on the moving direction of the optical card 3, A controller 15, a pulse drive circuit 16 for pulse-driving the light projection system for recording information, an APC (automatic output control) drive circuit 17 for driving the light projection system for reproducing recorded information, and a plurality of This includes switching devices 18,19°20. The laser diode 1, which is the light source of the first light projecting system A, is connected to the first circuit cut-off t? ! The pulse drive circuit 16 and the APC drive circuit 19 through the device 18
Similarly, a laser diode 2, which is a light source of the second light projection system A2, is connected to the pulse drive circuit 16 and the APC drive circuit 19 via a second circuit switch 19. Further, the first detector 13 and the second detector 14 are connected to the terminal for taking out the output signal (bit signal) via a signal switch 20, and each of these switches 18, 19, 20 It is linked to a controller 15 to control its switching operation.

The operation of this control system C will be explained.

FIG. 2 shows the relationship between the first and second spot lights SP, SPZ generated on the optical card 3 and the moving direction of the optical card 3 in this first embodiment. SP.

A black circle in sp represents a spot light for recording information, and a white circle represents a spot light for reproducing recorded information.

FIG. 2(a) shows the state when the optical card 3 is moved in the direction a, and in the figure (bl represents the state when the optical card 3 is moved in the direction b).

The controller 15 is for selecting and switching between the first spot light SPI and the second spot light SP generated on the optical card 3, depending on the mutual positional relationship between them for recording information or for reproducing recorded information. Then, the circuit is switched so that the spot light on the upstream side (preceding side) in the direction of movement of the optical card 3 is used for recording information, and the spot light on the downstream side (following side) is used for reproducing recorded information! 18 and 19 are switched, and the signal switch 20 is switched so that the detected pit signal becomes the pit signal from the light projection system for reproducing the recorded information.

By the way, laser light has a high energy density, and when a spot light for information recording is generated on the optical card 3, a shape as shown in FIG. 2 is formed on the track 5 provided on the information recording medium 4 of the optical card 3. Bit 6 of is recorded. This bit 6 part has a lower light reflectance than other parts, and when a spot light for reproducing recorded information is generated on that bit 6, it depends on whether the length of the pit 6 is long or short. ,
Since the amount of reflected light differs, it becomes possible to determine the data content.

FIG. 3 shows a two-light source system optical recording and reproducing device according to a second embodiment of the present invention, whereas in the first embodiment the light beams are separated into two light beams when passing through a prism due to the difference in wavelength. This second embodiment is an example in which the light beams are separated into two light beams using the difference in wavelength and polarization characteristics. For example, an interference filter is used to reflect or transmit light depending on the difference in wavelength. be.

In FIG. 3, the first light projecting system A1 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 converts the parallel light into a parallel light. After being reflected by the beam filter 21, it passes through the beam splitter 10 and the 1/4 wavelength plate 23, and is further connected to the optical card 3 by the objective lens 11 to form the first spot light SP, generate.

The second light projection system A2 uses another laser diode 2 as a light source, and forms the output light of this laser diode 2 into parallel light using a collimating lens 12, and passes this parallel light through an interference filter 22. After being further refracted by the beam splitter 10, the first spot light SP is focused on the optical card 3 by the objective lens 11.
A second spot light S P z is generated at a position in series with respect to the moving direction of the optical card 3 .

The first spotlight SP and the second spotlight S
The reflected light from the optical card 3 of P is reflected by the objective lens 1, respectively.
After passing through the 1st and 1/4 wavelength plates 23 and the beam splitter 10 (the first light projection system A1 passes through refraction and the second light projection system A2 passes straight through), the first spot The reflected light SP1 is reflected by the interference filter 22 and received by the first detector 13.

On the other hand, the reflected light from the second spot light SP2 passes through the interference filter 21 and is received by the second detector 14.

Note that the other configurations, connections, etc. are the same as those in FIG.

FIG. 4 shows a one-light source system optical recording and reproducing apparatus according to a third embodiment of the present invention, in which the first and second embodiments are different from each other.
While this is an optical recording/reproducing device with a light source system, this third embodiment is an example in which the light projection system is simplified by using a laser diode array 24 having two light emitting points as a light source. It is.

In FIG. 4, the first light projection system A1 and the second light projection system A2 use a laser diode array 24 having two light emitting points as a light source, and are located slightly apart from each other. The two output lights from the light emitting points are formed into parallel light by a collimating lens 7, passed through a beam splinter 10, a quarter wavelength plate 23, and then connected to the parallel points on an optical card 3 by an objective lens 11. , first spotlight SP, and second spotlight SP
2 respectively.

The distance between the spot lights SP and SP is determined by the distance between the light emitting points of the laser diode array 24 and the like.

The first spotlight SPl and the second spotlight S
The reflected light from the optical card 3 of P2 is passed through the objective lens 11 and the 1/4 wavelength light beam 23, respectively, and then refracted and passed through the beam splinter IO, and then reflected from the first light beam SP1. The reflected light is sent to the first detector 13, and the reflected light from the spot light SP2 of the second option is sent to the second detector 13.
It is detected by the detector 14 as an output signal.

FIG. 5 shows a two-light source system optical recording and reproducing apparatus according to a fourth embodiment of the present invention, in which the first to third embodiments have a light projection system for recording information and a light projection system for reproducing recorded information. In contrast, in this fourth embodiment, the first light projection system A1 is fixedly used for recording information, and the second light projection system A2 is fixedly used for reproducing recorded information. be.

In this embodiment, two spot lights 5P2a are produced using a laser diode array 25 having two light emitting points for each light projection system A2 for reproducing recorded information.

5p2b is generated on both front and rear sides of the spot light SP, and this second spot light 5Pza.

5pzb, the controller 15 selects the second spot light SP7 located on the downstream side (succeeding side) of the first spot light SP. This fourth embodiment is an example in which the light projection system is simplified by using a laser diode array 25 having two light emitting points as the light source of the second light projection system A2.

In FIG. 5, a first light projection system A1 for information recording connected to a pulse drive circuit 16 uses a laser diode 1 as a light source, and the output light of this laser diode 1 is transmitted through a collimating lens 7. The parallel light is formed into parallel light, reflected by a beam splitter 10, and then focused onto the optical card 3 by an objective lens 11 to generate a first spot light SP.

A second circuit for reproducing recorded information connected to the APC drive circuit 17
The light projection system A2 uses a laser diode array 25 having two light emitting points as a light source, and the light emitting points (A) and (B) of the laser diode array 25 are formed into parallel light by a collet lens 12. If necessary, this parallel light passes through a 172-wavelength plate 26 and further passes through beam splitters 8 and 10, and then is focused on the optical card 3 by the objective lens 11, and is directed in the direction of movement of the optical card 3. On the other hand, two second spot lights SP, a, and 5P2b are generated in series with the first spot light SP. Note that the 172 wavelength plate 26 changes the direction of straight parallel light from the laser diode 25 and connects it to the beam splitter 1.
This is to make it easier to pass through 0, and can be added or deleted as necessary.

The reflected lights of the second spot lights SPt a-SF3 b on the optical card 3 are each caused to travel backwards, pass through the objective lens 11, go straight through the beam splinters 10, and are then refracted and passed through the beam splinters 8. The signal is detected as an output signal by the second detector 14A and the second detector L4B.

The controller 15 in this fourth embodiment is as follows:
Second spot light SPz a for reproducing recorded information.

For 5p2b, select and switch the spot light on the downstream side (following side) of the first spot light SP1.
3) The APC drive circuit 17 is connected to the downstream (following side) light emitting point of the spot light among the light emitting points (A) and (B) of the laser diode array 25. The operation of the circuit switching device 19 will be controlled so as to

FIG. 6 shows a single light source system optical recording and reproducing apparatus according to a fifth embodiment of the present invention. While the first to third embodiments are a method of selecting and switching between the light projection system for recording information and the light projection system for reproducing recorded information, this fifth embodiment is similar to the fourth embodiment. The first light projection system AI is fixedly used for recording information, and the second light projection system A2 is fixedly used for reproducing recorded information, and while the fourth embodiment has two light projection systems,
In this fifth embodiment, by using a laser diode 27 having three light emitting points, a single light projection system is used, thereby greatly simplifying the light projection system.

In FIG. 6, the first light projection system A+ for information recording connected to the pulse drive circuit 16 uses the central light emitting point (C) of a laser diode array 27 having three light emitting points as its light source. The output light of the laser diode 1 is formed into parallel light by the colliding lens 7, passed through the parallel light beam splinter 10 and the 174-wave plate 23, and then focused onto the optical card 3 by the objective lens 11. The first spot light S P s is generated.

On the other hand, the second light projection system A2 for reproducing recorded information connected to the APC drive circuit 17 has light emitting points (D) (E) on both sides of the laser diode array 27 having the three light emitting points.
is a light source, and similarly to the first light projection system A1, two second spot lights SP! are projected onto the optical card 3 by traveling along optical paths with slightly different angles of optical axes from each other. a.

sp and b are generated before and after the above SP, respectively.

The reflected lights of the second spot lights S Pia and S Pz b on the optical card 3 are respectively caused to travel backwards and pass through the objective lens 11, and then are refracted and passed through the 174 wavelength plate 23 and the beam splinter 10, respectively. Second detector 14
A, detected as an output signal by the second detector 14B. The controller 15 then controls the second spot light SPz for reproducing recorded information to be located downstream (
The operation of the signal switch 20 is controlled to select and switch the spotlight on the downstream side (the downstream side) of the light emitting points (D) (E) of the laser diode 7 ray 27.
After that, the operation of the circuit switch 19 is controlled so that the APC drive circuit 17 is connected to the light emitting point of the spot light on the rear side).

In each of the embodiments described above, the optical card is moved relative to the light projection system, but the present invention is not limited to this, and it is also possible in principle to move the light projection system relative to the optical card.

<Effects of the Invention> Since the present invention is configured 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 operation of the information recording medium, The purpose of the invention is to be able to record information and reproduce recorded information simultaneously on both the outward and return trips, to greatly simplify the light projection system, and to omit complicated adjustments of the light projection system. It has achieved remarkable effects.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing the overall configuration of a first embodiment of the present invention, and FIG. 2 is a diagram showing the first and second spot lights sp of the first embodiment,
, sp, FIG. 3 is a diagram showing the overall configuration of the second embodiment of this invention, FIG. 4 is a diagram showing the entire configuration of the third embodiment of this invention, and FIG. FIG. 6 is a diagram showing the overall configuration of the fourth embodiment of the present invention, FIG. 7 is a diagram showing the overall configuration of the conventional example, and FIG. 8 is the conventional example. Example 7) It is a diagram showing an example of light generation. A1...First light projection system At...Second light projection system SP,...First spot light SP2...Second spot light B...Light receiving system C... Control system 1.2... Laser diode 15... Brewing controller 3... Optical card 4... Information recording medium 24.25.27... Laser diode ARE-I Patent Applicant Tateishi Electric Co., Ltd. Agent Patent Attorney Yoshimitsu Suzuki ″ ・＊ /
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Claims (5)

[Claims] (1) An optical recording and reproducing device that optically records and reproduces information while moving an information recording medium relative to a light projection system, the optical recording and reproducing device comprising: a first spot light beam for generating a first spot light on the information recording medium; a second light projection system for generating one or two second light spots on the information recording medium at serial positions along the relative movement direction with respect to the first light spot; of the first spotlight and the second spotlight, the upstream spot with respect to the relative movement direction is used as a spot for recording information, and the downstream spot is used as a spot for reproducing recorded information. An optical recording/reproducing device comprising a control system for selecting and controlling light. (2) The first light projection system and the second light projection system each use a separate laser diode as a light source, and the first light spot light and the second light spot light are used for information recording. 2. An optical recording and reproducing apparatus according to claim 1, wherein each spot light is generated on a medium. (3) The optical recording and reproducing apparatus according to claim 1, wherein the first light projection system and the second light projection system use a laser diode array having two light emitting points as a light source. (4) The first light projection system generates a first spot light for information recording using a laser diode having one light emitting point as a light source, and the second light projection system generates a first spot light for recording information. A laser diode array having a light emitting point is used as a light source to form a second spot light for reproducing recorded information at a position before and after the first spot light, and the control system includes:
2. The optical recording and reproducing apparatus according to claim 1, wherein a second spot light on the downstream side of the first spot light is selected and switched for use in reproducing recorded information. (5) The first light projecting system generates a first spot light for information recording using a central light emitting point of a laser diode array having three light emitting points as a light source, and also generates a first spot light for information recording. The light projecting system uses the other two light emitting points of the laser diode as light sources to form a second spot light for reproducing recorded information at the front and rear positions of the first spot light, and the control system includes: The first of the two second spotlights
2. The optical recording/reproducing apparatus according to claim 1, wherein a spot light downstream of the spot light is selected and switched for use in reproducing recorded information.