JPH07114790A - Optical information recording and reproducing device - Google Patents

Abstract

PURPOSE:To obtain an optical information recording and reproducing device in which heat generation in a sealed structure is suppressed and a required electric circuit is arranged adjacent to a pickup, and which is superior in measures for dust prevention and heat generation. CONSTITUTION:A fixed optical section 8 is fixed to a base 21, a part of the rear is raised up and a rear cover section 22 also used for a rear cover is formed. A top cover 23 of an optical disk device is attached on the upper end plane of the rear cover 22, the inside of the device in which a driving mechanism section of the fixed optical section is incorporated is sealed, and dust is prevented from entering the internal part. A first substrate 16 is fixed with a screw to the outside of the rear cover 22, and connected to a LD substrate 17 through a FPC 24. A main substrate 25 is fixed with a screw on the outer plane of the base 21, and connected to the first substrate 16 by connecting a PFC 27 to the main substrate 25.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical information recording / reproducing apparatus for recording and / or reproducing information by using a light beam.

[0002]

2. Description of the Related Art Conventionally, as a measure against dust in an optical information recording / reproducing apparatus, a fixed optical system is generally covered with a lid as in JP-A-4-79093.
In this case, no measures have been taken in the movable optical system,
It can be said that it is insufficient.

As disclosed in Japanese Patent Laid-Open No. 3-173989, there is a type that hermetically seals a drive mechanism section, which is very good against dust, but has a heating element inside the hermetically sealed section. If it is not reduced as much as possible, there is a risk that the drive mechanism will become hot.

On the other hand, the drive mechanism section includes an optical component and an electric circuit for recording / reproducing a recording medium and reading the position information of the objective lens. This electric circuit (LD drive circuit, RF signal amplifier, servo signal amplifier)
Is better the closer it is to LD or PD. The reason for this is
Regarding the LD drive circuit, as disclosed in Japanese Patent Laid-Open No. 62-5676, the modulation drive of the LD is speeded up, the rise and fall of the signal is accelerated, and the peak current value is increased. In this case, the EMI noise is suppressed to a low level, the external noise is reduced, the impedance up to the LD is reduced to reduce the cable loss, and the ringing due to reflection is suppressed to reduce L by ideal palmer modulation.
In order to drive D, it is desirable to dispose it as close to the LD as possible. Further, it is desirable that the RF and servo signal amplifiers are also arranged as close as possible to the PD in order to reduce external noise and prevent signal deterioration due to cable loss.

FIG. 8 shows one of conventional examples. FIG. 8 shows an optical information recording / reproducing apparatus having a so-called separated type pickup in which a movable part is lightened in order to shorten a seek time of the optical pickup, and a laser beam is supplied from the separated type pickup. It is sectional drawing which shows the structure of the fixing part.

A fixed optical system 102 is attached to a base 101 of the drive mechanism section, and this fixed optical system 102 detects the servo signal and the RF signal from the emission of the laser light 103 and the return light. The laser light 103 emitted from the fixed optical system 102 reaches an optical disk (not shown) via a movable optical system (not shown), and the reflected laser light returns to the fixed optical system 102 through the same optical path. Fixed optical system 1
In 02, although not shown, laser light from a laser diode (hereinafter, LD) as a light emitting element, a photodiode (hereinafter, PD) as a light receiving element, and LD is supplied to the movable optical system and return light is provided inside. Is provided with a prism for guiding the PD to the PD, and an LD substrate 104 mounted with an LD driving circuit for driving the LD and a PD substrate 105 mounted with a PD driving circuit for driving the PD are provided around the prism. Power supply to the LD substrate 104, amplification and processing of signals from the PD substrate 105, and the like are performed on the first substrate 106 via the lead wires 109, and further an FPC (flexible printed circuit board) 107.
Thus, the signal processed by the first board 106 is transmitted to the main board 108.

In FIG. 8, the rear cover 11 is attached to the base 101.
1. The top cover 112 is attached and the inside is hermetically sealed to prevent dust from entering the inside. The main substrate 108 is screwed to the base 101, is outside this hermetic seal, and is exposed to the flow of cooling air to radiate heat.

As described above, the lead wire 109 connecting the PD substrate 105 and the LD substrate 104 to the first substrate 106.
Is essential for performance. On the other hand, the FPC 107 becomes somewhat long as shown in FIG. 8 in consideration of the arrangement of mounted components on the first substrate 106, the work of inserting the connector, and the distribution of the FPC 107.

By the way, as shown in FIG. 9, the first substrate 1
If the structure in which 06 is not provided is provided, the PD substrate 105 and the LD
The substrate 104 must be directly connected to the main substrate 108 by the lead wire 109, and the lead wire 109 becomes long, which makes it easier for noise to be carried and the waveform to be dull.
Further, the fixed optical system unit cannot be assembled, which makes it difficult to assemble.

[0010]

However, in the conventional example of FIG. 8 described above, not only the PD substrate 105 and the LD substrate 104 but also the electric circuit mounted on the first substrate 106 and the like generate heat. It will raise the temperature of the part. As a countermeasure against heat generation, this electric circuit should also be arranged outside the sealed structure, but as mentioned above, in order to improve the performance of the drive, it must be arranged near the pickup in the sealed structure.

The present invention has been made in consideration of the above-mentioned drawbacks, and it is possible to suppress heat generation in a closed structure and to arrange a necessary electric circuit near the pickup to cope with high performance, dustproof, An object of the present invention is to provide a highly reliable optical information recording device which is excellent in measures against heat generation.

[0012]

In order to achieve the above object, according to the present invention, a vent hole is provided on the front surface and an insertion port for inserting a cartridge case for accommodating a disc-shaped recording medium is provided, and the disc-shaped component is internally provided. A fixing portion provided with a motor for rotating a recording medium, a semiconductor laser for emitting a laser beam to record and / or reproduce information on the disc-shaped recording medium at high speed, and the laser light from the fixing portion. An optical head provided separately from a movable part for irradiating the disk-shaped recording medium, a drive mechanism for driving the movable part of the optical head, and a drive mechanism part having a loading mechanism for the disk-shaped recording medium. ,
In an optical information recording / reproducing device comprising a circuit board for driving and controlling the drive mechanism section, when sealing the drive mechanism section, a part of the fixed optical section is used as a sealing wall, and the outside of this wall By providing an electric circuit board on the inside, heat generation inside the sealed structure can be suppressed, and the necessary electric circuit can be placed near the pickup to respond to higher performance, dust-proof, highly reliable optical with excellent heat generation countermeasures. This makes it possible to realize a formula information recording device.

[0013]

1 and 3 relate to a first embodiment of the present invention. FIG. 1 is a sectional view showing the configuration of a fixed optical section provided in an optical disk device, and FIG. 2 has the fixed optical section shown in FIG. 3 is an external view showing the external appearance of the optical disc device, FIG. 3 is a configuration diagram showing the configuration of the optical disc device of FIG. 2, and FIG. 3 is a sectional view showing the configuration of the fixed optical system of FIG.

As shown in FIG. 2, an insertion opening 2 for inserting and removing a cassette case (not shown) accommodating an optical disk described later is provided on the front surface of the optical disk apparatus 1, and the inside of the optical disk apparatus 1 is provided below it. A ventilation port 3 formed of a grid-like through hole for enabling ventilation and an eject switch 4 for ejecting the cassette case from the optical disk device 1 are provided.

In the optical disk device 1, as shown in FIG. 3, the optical disk 5 in the cassette case is mounted on a spindle motor 6 by a loading mechanism (not shown), and the optical disk 5 is rotated by the spindle motor 6. The drive mechanism section 1a of the optical disc apparatus 1 is composed of the loading mechanism (not shown), the spindle motor 6 and an optical head for irradiating the optical disc 5 with a laser beam to record / reproduce information.

The optical head comprises a movable optical section 7 and a fixed optical section 8. The laser light from the LD 9 in the fixed optical section 8 is supplied to the movable optical system 7 via an optical system such as a prism 10. To be done. In the movable optical system 7, the recording layer of the optical disc 5 is irradiated with laser light by the mirror 11 and the objective lens 12, and pits or the like are formed at the time of recording to record information.
Return light from the optical disk 5 returns through the same optical path and is separated by the prism 10 in the fixed optical system 8 and detected by the PD 13.

The signal detected by the PD 13 is amplified by the PD substrate 14 provided in the fixed optical section 8, and the first substrate 16 is provided.
Thus, a servo signal and a reproduction signal are generated. The objective lens 12 of the movable optical system 7 and the voice coil motor 15 that moves the movable optical system 7 in the radial direction of the optical disk 5 are controlled by the servo signal. The reproduction signal at the time of reproduction is further demodulated by the first board 16S and transmitted to a main board described later to transmit information to an external device. Further, the first substrate 16 modulates data and transmits the modulated data to the LD substrate 17 having an LD drive circuit for driving the LD 13 and controls the LD 13.

As shown in FIG. 1, the fixed optical portion 8 is fixed to a base 21, and a rear cover portion 22 is formed which is partially raised at the rear and also serves as a rear cover. The upper end surface of the rear cover portion 22 is the optical disc device 1
The top cover 23 is attached, and the inside of the device including the drive mechanism portion 1a on the fixed optical portion 2 side is sealed to prevent dust from entering the inside. And the rear cover part 22
The first substrate 16 is screwed to the outside of the, and is connected to the LD substrate 17 via the FPC 24. Further, the main board 25 is screwed to the outer surface of the base 21, and the PFC 27 connected to the connector 26 provided on the outer surface of the first board 16 is connected to the connector 28 of the main board 25. It is connected to the substrate 16.

The outer periphery of the apparatus is covered with a frame 30, and the air from the vent holes 3 provided on the front surface vents between the base and the main board and between the main board and the frame, and a ventilation section 31 provided on the back surface of the frame. The inside is cooled by being discharged from.

As described above, according to the optical disk device 1 of the first embodiment, the first substrate 16 is located outside the hermetically sealed first substrate.
The heat generated by the substrate 16 does not heat the inside of the device incorporating the drive mechanism section 1a. Further, since the first substrate 16 is directly connected to the rear cover portion 22 of the fixed optical system 8, the FPC
Connections from each element such as 24 to the first substrate 16 are also minimized. Further, since the connector 26 is also exposed to the outside, it is very easy to work.

Therefore, while the inside of the device having the movable optical part 7, the fixed optical part 8 and the drive mechanism part of the optical disk 5 is hermetically sealed, the heat generation of the first substrate 16 is not transmitted to the inside of the device and the dustproof property is secured. It is possible to take measures against heat generation.
Furthermore, the first substrate can be arranged near each element of the optical system, and an optical disk device that is not affected by noise or the like can be realized.

In addition, the frame 30 is provided with a ventilation portion 31 in which holes are partially formed on the rear side of the first substrate 16, and the flow of cooling air flows along the first substrate 16, so that the cooling effect is obtained. Is improved.

That is, according to the first embodiment, it is possible to obtain the following effects while taking the closed structure.

1. The first substrate 1 is provided in the immediate vicinity of the fixed optical unit 8.
Since 6 can be arranged, the length of the connecting line from each element to the first substrate can be very short.
For the PD, the same effect as in Japanese Patent Laid-Open No. 2-5676 can be reduced, and external noise can be reduced and signal deterioration due to cable loss can be prevented.

2. By arranging the first board 16 outside the hermetically sealed portion and arranging it at the rear end of the device, connection to the main board 25 can be performed in a very short distance, and external noise can be prevented and signal deterioration can be prevented. . In addition, since the connector can be removed, the assembly work such as the connection work becomes much easier. Furthermore, by arranging the first substrate 16 at the rear end of the device, the first substrate 1 has a size close to the entire area of the rear end face.
6 can be made, the degree of freedom in design is increased, and many parts can be placed, so that optimum design can be performed.

3. Since the first substrate 16 can be taken out of the sealed portion, heat generation inside the sealed portion can be further reduced.

4. By integrating the fixed optical unit 8 and the rear cover and arranging them at the rear end of the device, the number of parts can be reduced and the cost can be reduced, and the gap between the conventional fixed optical system and the rear cover (wiring such as lead wires) can be reduced. Space) and the space inside the sealed structure can be widened for effective use.

Next, a second embodiment will be described. FIG. 4 is a sectional view showing the arrangement of the fixed optical system according to the second example. Since the second embodiment is almost the same as the first embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

In the second embodiment, the portion of the second substrate 16 of the rear cover portion 22 is scooped out so that components can be mounted on the inner surface side of the first substrate 16 as well.
Is provided on the top of the top cover 23, and a second top cover 41 is further provided on the outside thereof to cover it to the rear so as to guide the flow of the cooling air from top to bottom.

According to this embodiment, the mounting area of the first substrate can be made large, and by placing the main substrate 25 on the upper side, it is possible to make it difficult to transmit heat to the inside of the device below.

Other configurations and effects are similar to those of the first embodiment.

Next, a third embodiment will be described. FIG. 5 is a sectional view showing the structure of the fixed optical system according to the third example. Third
The embodiment is almost the same as the first embodiment except that the mounting structure of the first substrate 16 is different from that of the first embodiment. Therefore, only different structures will be described and the same components will be denoted by the same reference numerals and description thereof will be omitted.

In the third embodiment, when fixing the first substrate 16,
The pillar 51 separates the rear cover 22 from the rear cover 22 to allow the back surface of the first substrate 16 to be mounted, and at the same time, facilitates the passage of cooling air. For other configurations and effects,
This is similar to the first embodiment.

Next, a fourth embodiment will be described. FIG. 6 is a sectional view showing the structure of the fixed optical system according to the fourth example. First
Since it is almost the same as the embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

In the fourth embodiment, the top cover 61 is wrapped around to the rear of the apparatus and the rear portion around the fixed optical section 8 is sealed.

According to this, the base of the fixed optical unit 8 is
The size can be almost the same as the conventional size, and the possibility of thermal deformation of the base of the fixed optical unit including the optical components can be minimized.

Other configurations and effects are similar to those of the first embodiment.

Next, a fifth embodiment will be described. FIG. 7 is a sectional view showing the structure of the fixed optical system according to the fifth example. First
Since it is almost the same as the embodiment, only different configurations will be described, the same configurations will be denoted by the same reference numerals, and description thereof will be omitted.

The fifth embodiment is effective when the area of the first board 16 is small, and the fixed optical section 8 is arranged at the rear end of the base, and the first board 16 is mounted on the upper part of the fixed board 71. Place it with screws. This makes space in the depth direction advantageous.

The structure of the top cover 61 is almost the same as that of the fourth embodiment, and covers the periphery of the fixed optical section 8.

Other structures and effects are similar to those of the first embodiment.

In each of the above-described embodiments, the optical disk device records / writes on any of a read-only optical disk, a write-once optical disk, a phase change optical disk, and a magneto-optical disk.
It goes without saying that it may be a device for reproducing.

[0043]

As described above, according to the present invention, when the drive mechanism section is sealed, a part of the fixed optical section is used as a sealing wall, and the electric circuit board is provided outside the wall. As a result, a highly reliable optical information recording device that suppresses heat generation in the closed structure and arranges necessary electric circuits near the pickup to support high performance, and has excellent dustproof and heat generation measures is realized. The effect is that you can do it.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a configuration of a fixed optical section provided in an optical disk device according to a first example. FIG. 2 is an external view showing the external appearance of an optical disk device that incorporates the fixed optical unit shown in FIG.

FIG. 2 is an external view showing the external appearance of an optical disk device incorporating the fixed optical unit shown in FIG.

3 is a configuration diagram showing a configuration of the optical disk device of FIG.

FIG. 4 is a cross-sectional view showing the configuration of a fixed optical system according to a second example.

FIG. 5 is a sectional view showing the configuration of a fixed optical system according to a third example.

FIG. 6 is a sectional view showing the arrangement of a fixed optical system according to Example 4.

FIG. 7 is a cross-sectional view showing the configuration of a fixed optical system according to Example 5.

FIG. 8 is a cross-sectional view showing the configuration of a fixed optical system according to a conventional example.

9 is a cross-sectional view showing a configuration of a modified example of the fixed optical system of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Optical disk device 1a ... Drive mechanism part 2 ... Insertion port 3 ... Vent hole 5 ... Optical disk device 6 ... Spindle motor 7 ... Movable optical part 8 ... Fixed optical part 14 ... PD substrate 16 ... 1st substrate 17 ... LD substrate 21 ... Base 22 ... Rear cover part 23 ... Top cover 24, 27 ... FPC 25 ... Main board 26, 28 ... Connector 30 ... Frame

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[Procedure amendment]

[Submission date] January 13, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

Further, as disclosed in Japanese Patent Laid- Open No. 173939/1993, there is a type in which the drive mechanism is hermetically sealed. This is very excellent against dust, but the heating element inside the hermetically sealed part is used. If it is not reduced as much as possible, there is a risk that the drive mechanism will become hot.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

On the other hand, the drive mechanism section includes an optical component and an electric circuit for recording / reproducing a recording medium and reading the position information of the objective lens. This electric circuit (LD drive circuit, RF signal amplifier, servo signal amplifier)
Is better the closer it is to LD or PD. The reason for this is
Regarding the LD drive circuit, as disclosed in Japanese Patent Laid-Open No. 62-5676, the modulation drive of the LD is speeded up, the rise and fall of the signal is accelerated, and the peak current value is increased. In this case, the EMI noise is suppressed to a low level, the external noise is reduced, the impedance up to the LD is reduced to reduce the cable loss, and ringing due to reflection is suppressed to achieve an ideal pulse modulation L.
In order to perform D driving, it is desirable to dispose it as close to the LD as possible. Further, it is desirable that the RF and servo signal amplifiers are also arranged as close as possible to the PD in order to reduce external noise and prevent signal deterioration due to cable loss.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

Relates to a first embodiment of EXAMPLES 1 to 3 the invention, FIG. 1 is a sectional view showing the configuration of a stationary optical section provided within the optical disk apparatus 2 incorporates a stationary optical system of FIG. 1 FIG. 3 is an external view showing the external appearance of the optical disc device, and FIG. 3 is a configuration diagram showing the configuration of the optical disc device of FIG.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

The signal detected by the PD 13 is amplified by the PD substrate 14 provided in the fixed optical section 8, and the first substrate 16 is provided.
Thus, a servo signal and a reproduction signal are generated. The objective lens 12 of the movable optical system 7 and the voice coil motor 15 that moves the movable optical system 7 in the radial direction of the optical disk 5 are controlled by the servo signal. The reproduction signal at the time of reproduction is further processed by the first substrate 16 and transmitted to a main substrate described later to transmit information to an external device. In addition, the first substrate 16 drives the LD 13.
The LD drive circuit for
Data is transmitted and the LD 13 is controlled.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

2. By arranging the first board 16 outside the hermetically sealed portion and arranging it at the rear end of the device, connection to the main board 25 can be performed in a very short distance, and external noise can be prevented and signal deterioration can be prevented. . In addition, since the connector can be removed, the assembly work such as the connection work becomes much easier. Moreover, this placing the first substrate 16 to the apparatus rear
Thus, the size of the first substrate 16 becomes close to the total area of the rear end face.
Can be made, the degree of freedom in design is increased, and many parts can be placed, which enables optimum design.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

FIG. 1 is provided in the optical disc device according to the first embodiment .
Sectional drawing which shows the structure of the fixed optical part.

Claims (2)

[Claims] 1. A motor for rotating the disk-shaped recording medium, comprising a vent hole on a front surface and an insertion opening for inserting a cartridge case for accommodating the disk-shaped recording medium.
Irradiating the disc-shaped recording medium with a fixed portion provided with a semiconductor laser that emits a laser beam for high-speed recording and / or reproduction of information on the disc-shaped recording medium and the laser beam from the fixed portion. And a drive mechanism for driving the movable section of the optical head, a drive mechanism section having a loading mechanism for the disk-shaped recording medium, and a drive control section for the drive mechanism section. In the optical information recording / reproducing apparatus having a circuit board for performing the sealing of the drive mechanism section, a part of the fixed optical section is used as a sealing wall, and an electric circuit board is provided outside the wall. An optical information recording / reproducing apparatus characterized in that 2. A servo amplifier for generating a servo signal for controlling the optical head based on at least a reproduced signal from the optical head, and a reproduced signal from the optical head is amplified by a constituent circuit of the electric circuit board. An optical information recording / reproducing apparatus according to claim 1, which is an RF amplifier.