JP2698210B2 - Optical disk drive - Google Patents

Description

The present invention relates to a disk recording / reproducing apparatus such as an optical disk recording / reproducing apparatus and a magneto-optical disk recording / reproducing apparatus.
The present invention relates to an optical disk device having an excellent dustproof effect, heat generation preventing effect, or heat radiation effect.

[Conventional technology]

For example, an optical disk recording / reproducing device is a device that records and reproduces high-density information on an optical disk, which is an optical recording medium, and has a feature that the recording medium can be easily replaced.

However, on the other hand, because of the handling of light, if dust in the air accumulates on the objective lens of the optical pickup due to long-term use, the laser light output from the objective lens or collected by the objective lens is disturbed by the dust. In some cases, performance degradation such as poor access may occur, and as a result, the life of the device will be shortened.

In addition, in order to increase the density, electronic components such as a laser diode of an optical pickup and electric components such as a motor for rotating a disk are arranged in a narrow space. Since heat is generated when reading or writing the disk, the temperature inside the device may be high, which results in shortening the life of the device.

Therefore, in the conventional optical disc recording / reproducing apparatus, for example, a means for determining a flow path of air is provided as dustproof means so that dust entering with air does not approach the optical pickup, or an air filter is provided in the air intake port. I was doing.

Related to this type of means are, for example,
JP-A-62-52785, JP-A-62-2989074, JP-A-63-298907
-293783 and JP-A-64-52279.

Further, as the heat radiating means, there is a means for air cooling by allowing air to flow naturally or forcibly, and related to this kind of means include, for example, JP-A-64-43888.

[Problems to be solved by the invention]

In the above prior art, dust prevention, heat generation prevention or heat dissipation,
Are not performed at the same time, so that there is a problem that the life of the device is shortened anyway.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art, and to provide an optical disk device capable of simultaneously improving a dustproof function and a heat-preventing function or a heat-dissipating function and greatly extending the life. It is in.

[Means for solving the problem]

To achieve the above object, the optical disk device according to the present invention comprises at least an optical pickup mounting mechanism for mounting an optical pickup, a disk turntable, a turntable rotating motor, and the optical pickup mounting mechanism, together with an optical pickup. The optical pickup transfer motor for transferring the disk on the table in the radial direction and a disk insertion / ejection mechanism are placed in a case having an insertion / ejection port, and the optical disk is inserted / ejected by the disk insertion / ejection mechanism via the insertion / ejection port. When performing the above operation, a laser output from a laser diode in the optical pickup according to a given command is performed on a unit having a structure in which an opening / closing lid of the insertion / ejection opening is opened, and on an optical disk located on a turntable in the case. After playing back at least the information in After the desired time, the means for stopping or reducing the output of the laser diode in the optical pickup, the assumed comprising at least provided.

In this optical disk device, when a power supply unit is provided, a partition for isolating the unit from a heat generating unit including the power supply unit is provided.

[Action]

According to the present invention, except when the disc is inserted and ejected, the insertion and ejection port is closed by the lid, and the inside of the case is substantially sealed. Therefore, the disc insertion and ejection mechanism, the disc rotation motor, and the optical pickup It is possible to reduce intrusion of dust into the case housing the drive mechanism and the like, and to improve the dustproof function.

Further, in the present invention, when the command does not come after a given time after a given command, the output of the laser diode in the optical pickup is stopped or reduced, so that heat generation can be suppressed, and heat generation can be suppressed. The prevention function can be improved. Further, since the time during which the disk is rotated at the regular rotation is reduced, the amount of dust that enters with air through the minute gap of the case during long-term use can be further reduced, and the optical pickup It is possible to greatly improve the reading failure due to dust accumulated on the objective lens inside.

Further, when a partition for isolating the optical disk recording / reproducing unit is provided from a heating unit including a power supply unit, heat generation can be blocked by the partition, so that the temperature of the optical disk recording / reproducing unit is not affected. In addition, the heat radiation function can be improved.

〔Example〕

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a partially cutaway perspective view showing a stand-alone type optical disc recording / reproducing apparatus as a first embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along the line II of FIG. FIG.

In these figures, 1 is a case having a disc insertion / ejection port 1a, 2 is a partition, 3 is a power transformer (hereinafter abbreviated as a transformer), and 4 and 5 are substrates, each of which is fixed to a chassis 6 with screws 7 I have.

Reference numeral 8 denotes a front panel, 9 denotes a cover having heat radiation holes 9a and 9b on the left and right side surfaces, and 10 denotes a rear plate, each of which surrounds the above-mentioned components fixed to the chassis 6.

11 is a lid attached to the front panel 8,
The disk insertion / ejection opening 1a of the case 1 is opened and closed. Also the lid
11 is a spring (not shown) toward the disc insertion / ejection port 1a.
Therefore, when the disc insertion / ejection opening 1a is closed, the inside of the case 1 is substantially sealed.

12 is a disk stored in a cassette (not shown), 14
Is a disk insertion / ejection device, 15 is a turntable,
The disc 12 is inserted into the apparatus via the disc insertion / ejection opening 1a, and is placed on a turntable 15 by the disc insertion / ejection device 14.

Reference numeral 17 denotes a unit mechanism, which includes a disk rotation motor (not shown) for rotating the turntable 15 during recording and reproduction by an optical pickup (not shown), and an optical pickup mounting mechanism (not shown) for mounting the optical pickup. ,
A linear motor (not shown) for transporting the optical pickup mounting mechanism in a predetermined direction together with the optical pickup.

Reference numeral 16 denotes a unit plate on which the disk insertion / ejection device 14 and the unit mechanism 17 are mounted, and is supported by rubber 18 and a spring 19.

Incidentally, the disc 12, the disc insertion / ejection device 14, the turntable 15, the unit plate 16, the unit mechanism 17, the rubber 18
The spring 19 is housed in the case 1.

In this embodiment, as shown in FIG. 1 and FIG.
Disk 12, disk insertion / ejection device 14, turntable 1
5, the unit plate 16, the unit mechanism 17 and the like are housed in the case 1, and except when the disk 12 is inserted and ejected,
The disk insertion / ejection opening 1a is closed by the lid 11,
Since the inside of the case 1 is almost in a sealed state, the intrusion of dust is small.

Further, even if the mounted components (not shown) of the transformer 3 and the board 5 generate heat, the heat is dissipated by the radiating holes 9 a provided in the cover 9.
The heat is radiated to the outside of the apparatus via the partition wall 2 and is blocked by the partition 2, so that the temperature in the case 1 is not affected.

Furthermore, as the partition 2, an iron plate or permalloy,
By using the stiff rigid plate, the rigidity of the chassis 6 can be increased, so that the anti-vibration performance of the device can be improved. In addition, since the magnetic flux easily passes through the inside of the iron plate, the permalloy, or the diaper rigid plate, the magnetic flux leaked from the transformer 3 or the like is absorbed into the partition 2 and does not reach the case 1. There is no adverse effect on the components within 1.

Further, in this embodiment, as shown in FIGS. 3 and 4, the control unit prevents the heat generation of the laser diode of the optical pickup and the motor for rotating the disk and prevents the dust from entering the case 1. Prevents intrusion.

 Hereinafter, this will be described in detail.

FIG. 3 is a block diagram showing a main part in the optical disk recording / reproducing apparatus of FIG. 1, and FIG. 4 is a flowchart showing a control operation of a control unit of FIG.

3, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals. In addition, 100 is an optical disk recording / reproducing device, 101 is a disk rotation motor, 102 is an optical pickup, 103 is an optical pickup mounting mechanism, 104 is an optical pickup transfer linear motor, 105 is a positioning control circuit, 106 is a rotation speed control circuit, 107 is a read / write circuit, 108 is a control unit, 109 is an interface unit, 110 is a host computer, 111 is a keyboard, 112
Denotes a printer, 113 denotes a display, and 114 denotes a floppy disk.

In this embodiment, when a command does not come from the host computer 110 connected to the optical disc recording / reproducing apparatus 100 for a certain time (several minutes), the control unit 108 in the disc recording / reproducing apparatus 100 operates until the next command comes. Either the output of the laser diode (not shown) of the pickup 102 and the rotation of the turntable 15 are stopped, or the output of the laser diode and the rotation speed of the turntable 15 are reduced.

 Hereinafter, description will be given according to the flowchart of FIG.

When the system centered on the host computer 110 operates (step 201) and the disk 12 is inserted from outside the device, the control unit 108 first rotates the turntable 15 (step 202) and The laser power is turned on (step 203). Then, the reading is started (Step 204), and thereafter, the reading is ended by an end command (Step 205).

If there is no next instruction (step 206), the end of the task or the jop is determined (step 207), and if it is, the end processing (step 208) is performed to finish the read processing.

If the task or the job is not in the end but in the instruction waiting state, the waiting time TS from the end of reading is judged (step 209). If the waiting time TS has reached a certain time, the turntable 15 is stopped or The rotation speed is reduced (step 210), and the laser power is turned off or reduced (step 211), and the process waits for the next command.

If there is the next instruction (step 206), turntable 1
It is determined whether the rotations of the turntable 5 are synchronized or the laser power is ON (step 212). If not, the rotation of the turntable 15 is synchronized (step 20).
2) Turn on the laser power (step 203), and perform reading.

As described above, according to the present embodiment, the host computer 11
If no command is received for a certain period of time (several minutes) from 0, the rotation of the turntable 15 and the output of the laser diode of the optical pickup 102 can be stopped or reduced. Can be improved.

Further, in this embodiment, as described above, the disc insertion / ejection opening 1a is
Is closed and the inside of the case 1 is almost in a sealed state, so that the intrusion of dust is small. However, the inside of the case 1 is not completely sealed, and there is a minute gap due to wiring such as a lead wire or a minute gap in the configuration.
Due to the rotation of 15, the air is sucked into the case 1 through the minute gap, and the dust infiltrates slightly.

However, in the present embodiment, as described above, if no command is received from the host computer 110 for a certain period of time, the rotation of the turntable 15 is stopped or the rotation speed of the turntable 15 is reduced. The amount of dust entering through the minute gap of the case 1 is reduced as a whole. As a result, reading defects due to dust accumulated on the objective lens (not shown) of the optical pickup 102 are greatly improved.

The adjustment of the above-described waiting time TS (that is, the time until the control unit 108 stops the rotation of the turntable 15 and stops or decreases the output of the laser diode of the optical pickup 102 after the command is not received from the host computer 110) For example, adjustment may be performed by providing a knob outside the device and turning the knob, or a sensor may be provided inside the device and adjustment may be performed based on a signal from the sensor.

The rotation of the turntable and the stop or reduction of the output of the laser diode due to the stop of the command are also included in the scope of the present embodiment even when used in combination with other dustproof and heat radiation means.

 Next, a second embodiment of the present invention will be described.

FIG. 5 is a partially cutaway perspective view showing an optical disc recording / reproducing apparatus according to a second embodiment of the present invention, and FIG.
It is sectional drawing which shows the cross section along the II-II line direction of the figure.

In these drawings, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals.

In the present embodiment, a plurality of sets each including the disk insertion / ejection device 14, the turntable 15, and the unit mechanism 17 (in FIG.
Pair), and are housed in the case 1 while being supported by the rubber 18 and the spring 19, respectively.

In addition, a heat generating part such as the transformer 3 is disposed at an upper part of the apparatus and behind the case 1.

Thus, the disc insertion / ejection device 14, the turntable 1
5, Even when there are a plurality of sets composed of the unit mechanism 17, as in the above-described embodiment, except when the disc is inserted and ejected,
Since the disk insertion / ejection opening is closed by the lid 11 and the inside of the case 1 is substantially sealed, the intrusion of dust can be reduced.

In addition, by arranging the heat generating portion such as the transformer 3 above the apparatus and behind the case 1, it is possible to suppress the influence of the heat from the heat generating portion such as the transformer 3 on the temperature inside the case 1.

Furthermore, in the present embodiment, similarly to the above-described embodiment, the control section prevents the heat generation of the laser diode of the optical pickup and the motor for rotating the disk, and also prevents the intrusion of dust into the case 1. can do.

 Next, a third embodiment of the present invention will be described.

FIG. 7 is a sectional view showing a longitudinal section of an optical disk recording / reproducing apparatus as a third embodiment of the present invention.

7, the same components as those in FIGS. 1 and 2 are denoted by the same reference numerals. In addition, 20 is a blower.

In this embodiment, the blower 20 is arranged behind the case 1.

According to the present embodiment, the blower 20 allows the outside air to flow from the outside of the device in the direction of the arrow (a), thereby cooling the case 1 by air.

Also, in this embodiment, as in the above-described embodiment, the disc insertion / ejection opening is closed by the lid 11 except when the disc is inserted / ejected, and the inside of the case 1 is almost sealed. Can be reduced. Further, by the operation of the control unit, it is possible to prevent heat from being generated in the laser diode of the optical pickup and the disk rotating motor and to prevent dust from entering the case 1.

〔The invention's effect〕

According to the present invention, except when the disc is inserted and ejected, the insertion and ejection opening is closed by the lid, and the inside of the case is substantially sealed, so that the disc insertion and ejection mechanism, the disc rotation motor, the optical pickup drive mechanism, and the like are provided. Intrusion of dust into the case to be stored can be reduced, and the dustproof function can be improved.

Further, according to the present invention, when a command is not received from the host computer or the control unit for a certain period of time, the control unit stops or reduces the output of the laser diode in the optical pickup until the next command is issued, so that long-term , Heat generation can be suppressed, and the function of preventing heat generation can be improved. Therefore, the temperature of the electronic elements and electric components used in the entire apparatus can be suppressed within the performance guarantee range, and the MTBF (mean time between failures) is extended.

In addition, since the time during which the disk (turntable) is rotated at the regular rotation time is reduced, the amount of dust entering with air through the minute gap of the case during long-term use can be further reduced. It is possible to significantly reduce reading defects due to dust accumulated on the objective lens of the pickup.

When a partition is provided to isolate the case from a heat-generating part such as a power supply unit or a printed circuit board, and a heat-dissipating hole is provided in a cover on the heat-generating part side of the apparatus, heat from the heat-generating part is passed through the heat-dissipating hole. Can be dissipated to the outside of the device, and can be blocked by the partition, so that the temperature inside the case is not affected and the heat dissipating function can be improved.

In addition, when the partition wall is formed of a rigid body, the rigidity of the chassis of the device can be increased, so that the vibration resistance performance of the device can be improved. In the case of a magnetic material, since the magnetic flux easily passes through the inside, the magnetic flux leaked from the power supply unit or the like is absorbed by the inside of the partition and does not reach the case. Does not adversely affect

[Brief description of the drawings]

FIG. 1 is a partially cutaway perspective view showing an optical disk recording / reproducing apparatus according to a first embodiment of the present invention, and FIG. 2 is a sectional view showing a cross section taken along line II of FIG. FIG. 3 is a block diagram showing a main part of the optical disk recording / reproducing apparatus shown in FIG. 1, FIG. 4 is a flowchart showing a control operation of a control unit shown in FIG. 3, and FIG. 5 is a second embodiment of the present invention. FIG. 6 is a partially cutaway perspective view showing an optical disk recording / reproducing apparatus, FIG. 6 is a sectional view showing a section taken along line II-II of FIG. 5, and FIG. 7 is a third embodiment of the present invention. FIG. 2 is a cross-sectional view showing a vertical cross section of an optical disc recording / reproducing apparatus as an example. DESCRIPTION OF SYMBOLS 1 ... case, 2 ... wall, 3 ... transformer, 4,5 ...
Substrate, 9 ... Cover, 9a, 9b ... Heat dissipation hole, 11 ... Lid, 12
… Disc, 14… Disc insertion / ejection device, 15… Turntable, 17… Unit mechanism, 18… Rubber, 19…
... Spring, 102 ... Optical pickup, 108 ... Control unit.

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Koichi Ihara 292 Yoshida-cho, Totsuka-ku, Yokohama-shi, Kanagawa Prefecture Inside the Yokohama Plant of Hitachi, Ltd. (56) References JP-A-61-227265 (JP, A) 2-141957 (JP, A) Japanese Utility Model Showa 62-80252 (JP, U)

Claims (2)

(57) [Claims] An optical pickup mounting mechanism for mounting an optical pickup, a turntable for a disk, a motor for rotating a turntable, and the optical pickup mounting mechanism are transported together with the optical pickup in a radial direction of the disk on the turntable. When the optical pickup transfer motor and the disc insertion / ejection mechanism are placed in a case having an insertion / ejection port, and the optical disc is inserted / ejected by the disc insertion / ejection mechanism via the insertion / ejection port, the insertion / ejection port is A unit having a structure in which the opening / closing lid is opened, and an optical disk located on a turntable in the case, at least reproduction of information was performed by a laser output from a laser diode in the optical pickup according to a given instruction. After a lapse of a desired time, the optical pickup Optical disc apparatus characterized by means for stopping or reducing the output of the laser diode, was at least provided. 2. The optical disk device according to claim 1, wherein when a power supply unit is provided, a partition for isolating the unit from a heat generating unit including the power supply unit is provided.