JPH1186327A - Optical disk device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable an optical pickup drive to cope with a cartridge having a prescribed thickness by arranging respective elements constituting the optical pickup drive housable in the opening area of the shutter of the cartridge to make it thinner. SOLUTION: All mechanical parts of the optical pickup drive such as objective lens 10 actuator 11, carriadge 3, laser element 13, light receiving elements 14, base, turntable 5, spindle motor and so forth are incorporated in an opening part by making the size of an opening at the time the shutter 9 provided in a cartridge is totally opened in a lateral direction is made to be about 36 mm. A surface confrontation motor whose height in a height direction can be made very low is used as the spindle motor. The carriadge 3 is made to be crept under the spindle motor. Thus, the whole of the optical pickup drive is made possible to be housed in the opening part of the shutter part 9. Moreover, the pickup drive is prevented from the contact due to vibration with the opening by making heights of the length and breadth of the pickup drive have gaps a little with respect to the opening.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to MO, PD, CD
The present invention relates to an optical reproduction and recording-related information disk device such as a ROM, a DVD-ROM, and a DVD-RAM, and more particularly to an optical disk device that uses an optical disk medium housed in a cartridge.

[0002]

2. Description of the Related Art MO, PD, CD-ROM, DVD-R
Optical recording / reproducing devices such as OM and DVD-RAM have been reduced in size and thickness, and have been incorporated in portable personal computers. With such miniaturization and thinning, an optical pickup drive, which is a key device of an optical recording / reproducing apparatus, is also required to be miniaturized and thinned.

Conventionally, in an optical reproducing apparatus generally used, an optical disk of 8 cm or 12 cm is often used as it is as a bare disk. In the case of an optical recording device, a synthetic resin cartridge is stored as a case in order to prevent the disc surface from being scratched or dust attached, and the case is taken out of the optical recording device as it is. And use it.

On the other hand, portability of notebook personal computers and the like is regarded as important. Therefore, development of not only a reduction in thickness but also a reduction in weight and size is the main focus of development. For this reason, the built-in C
D-ROM, DVD-ROM, DVD-RAM, HD
D, FDD, etc. are also required to be thinner.

Here, when a cartridge is used, it is naturally thicker than a bare disk. CD-ROM and DVD-RO
Although a bare disk such as M has a thickness of about 1.2 mm, the thickness of a cartridge case for storing the bare disk is about 8 mm, and is necessarily thick when viewed from the entire apparatus.

[0006] The following are factors that make the device thicker. (1) In general, the shutter portion of the optical recording device that receives the cartridge is designed to open about 36 mm, and the optical pickup drive is arranged in a direction perpendicular to the disk surface rather than the opening (the shutter opens and closes). Direction) is large. For this reason, it is necessary to arrange the portion that is larger than the opening of the shutter and protrudes below the resin surface forming the lower surface of the cartridge, and the thickness of the apparatus increases accordingly.

(2) In a type in which a disk is housed in a cartridge, it is necessary to first chuck (clamp) the disk after opening a shutter. In this case, since a bare disk has no shutter, the user himself mounts the disk on the turntable in general, and a mechanism for that purpose is not particularly required, which does not lead to an increase in thickness. However, if the shutter is opened, the disc cannot be clamped by the user himself. Therefore, a chucking mechanism using a magnet and a clamper is required, thereby increasing the thickness of the apparatus.

(3) When the cartridge is inserted into the optical disk device, a space for sliding the cartridge from the side is required. Then, when the cartridge is inserted into the apparatus, a mechanism for moving the optical pickup from bottom to top is required, and the thickness of the apparatus must be increased to secure this movement range.

As described above, the cartridge-compatible device tends to be thicker due to the bulk of the optical pickup and the like, and a specific example is shown in FIG. 12 as a sectional view of an optical disk device such as a PD.

In FIG. 12, a carriage 3 on which an objective lens and an actuator are mounted and a spindle motor 4 for rotating the optical disk 1 are arranged inside a resin cartridge 2 capable of storing the optical disk 1. The optical disk 1 can be held on a turntable 5 connected to the optical disk 1. Then, a substrate 6 is disposed on the bottom side of the metal housing 8 housing the cartridge 2, and an electric component 7 such as an IC is fixed on the substrate 6 by soldering or the like.

[0011]

In such an optical disk device (PD, etc.) compatible with the conventional cartridge, it is standard that the thickness of the device, that is, the height of the housing 8 is half height (41.3 mm). It is a typical specification. Even if the thickness of each element such as the housing 8, the clamp structure, the electric component 7, and the optical pickup is considered and implemented, it is considered that the limit is about 25 mm.

At present, the thickness of a CD-ROM drive device is mainly 17 mm (イ ン チ inch), but is 12.7.
Drives with mm thickness (1/2 inch) have also been developed. For this reason, optical drive devices compatible with cartridges such as DVD-RAM have been standardized, and 1
It is a 7 mm thick drive. However, at present,
Its thickness has not been achieved.

[0013] The present invention provides a 17 mm
It is an object of the present invention to provide an optical disk device that can handle a cartridge having a thickness.

[0014]

SUMMARY OF THE INVENTION The present invention provides an objective lens for reading information from an optical disk, an actuator for driving the objective lens in a focus direction and a tracking direction, and an inner and outer periphery of the optical disk holding the actuator. , A feed mechanism for sliding the carriage, a laser element and a light receiving element mounted on the carriage, a turntable for holding the optical disk, and a spindle motor for rotating the turntable. In an optical disk apparatus provided with an optical pickup drive, each component is housed and arranged in the opening area of a shutter of a cartridge in which an optical disk is housed.

With such a configuration, the entire optical pickup drive can be arranged at the shutter opening of the cartridge in which the optical disk is stored, and can be used, for example, with a 17 mm-thick cartridge that is being standardized.

[0016]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an objective lens for reading information from an optical disk, an actuator for driving the objective lens in a focus direction and a tracking direction, and A carriage moving from the periphery to the outer periphery,
An optical disc apparatus having an optical pickup drive by a combination of a feed mechanism for sliding the carriage, a laser element and a light receiving element mounted on the carriage, a turntable for holding the optical disc, and a spindle motor for rotating the turntable. , Each component is housed and arranged in the opening area of the shutter of the cartridge in which the optical disk is housed, and the optical pickup drive is housed in the opening of the cartridge. Therefore, it is possible to achieve a reduction in thickness.

According to a second aspect of the present invention, the vertical and horizontal bulks of the optical pickup drive have a size corresponding to a positional relationship having a small gap with respect to the opening of the cartridge. Even when the optical pickup drive is supported by a rubber damper or the like so as not to directly transmit the vibration, the optical pickup drive does not touch the opening of the cartridge even if the optical pickup drive is shaken by the vibration due to the interposition of the gap. .

According to a third aspect of the present invention, a part of the carriage can be positioned below the spindle motor, the carriage is reduced in size, the rigidity of the resin carriage is improved, and the disk or the actuator is improved. Has an effect of increasing resistance to unnecessary vibration (disturbance).

According to the fourth aspect of the present invention, a part of the carriage can be positioned below the turntable, and the carriage can be reduced in size and weight, so that the weight of the entire apparatus can be reduced. It has the action of:

According to a fifth aspect of the present invention, the laser element or the light receiving element mounted on the carriage can be positioned below the spindle motor, and the lower part of the spindle motor has a very small magnetic flux of the motor magnet. Since it is small, it has an effect of suppressing the influence of electromagnetic waves on the laser element and the light receiving element.

According to a sixth aspect of the present invention, the laser element or the light receiving element mounted on the carriage can be positioned below the turntable, and the laser element generates heat but is below the rotating turntable. In this arrangement, the airflow caused by the rotation of the turntable is used to promote heat dissipation.

According to a seventh aspect of the present invention, there is provided an objective lens,
The laser element or light receiving element and the center of the spindle motor are arranged almost in a straight line.Assembly accuracy of each member can be controlled, so that the optical axis shift is reduced and stable characteristics are obtained. It has the effect of being obtained.

According to the present invention, the laser element and the light receiving element are integrated as one package, and the characteristics of the laser element and the light receiving element change over time or over time by being integrated into the package. It has the effect of suppressing.

According to a ninth aspect of the present invention, the laser device is a combination of two laser devices each having a different wavelength, and the existing CD-ROM, CD-R, and CD-AU
DIO, of course, high-density type DVD-ROM,
It has the effect of being able to read DVD and DVD-RAM displays.

Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. FIG. 1 is a plan view of an optical pickup drive housed in a cartridge of the present invention, and FIG.
Is a cross-sectional view of the type in which an optical pickup drive is housed in an opening of a cartridge into which an optical disk is inserted.

In FIG. 1 and FIG. 2, an optical disc 1 on which information is recorded or on which information is recorded is housed in a synthetic resin cartridge 2 having a length, width, and thickness of 136 mm × 125 mm × 8 mm. A base 15 is provided on the bottom surface of the cartridge 2, and the carriage 3 is connected to a feed mechanism 12 provided on the base 15 so that the carriage 3 can be driven. The optical disk 1 is mounted on a turntable 5 rotatably provided above a base 15, and a spindle motor 4 for directly connecting an output shaft to the turntable 5 and driving the rotation is provided inside the cartridge 2. The turntable 5 is made of synthetic resin or metal, and has an outer diameter of about 30 mm.

The carriage 3 has an actuator 11 and the like connected to the objective lens 10 mounted thereon.
Accordingly, the optical disk 1 moves on a trajectory corresponding to the radial direction. The actuator 11 is a synthetic resin objective lens 1 for focusing on the recording surface of the optical disc 1.
0 is supported by four thin wires or a thin resin wire, and moves in the focusing direction and the tracking direction by a magnetic driving force of a thin copper wire coil and a magnet incorporated therein.

The cartridge 2 includes a shutter 9 as a part thereof. The shutter 9 is a metal plate that slides in a lateral direction, and has an opening having a size of about 36 mm when fully opened.

Further, as an optical system for the optical disk 1, a laser element 13 and a light receiving element 14 are provided, respectively.
Light is emitted from the laser element 13 and focused on the optical disc 1.

The shutter 9 of the cartridge 2 is normally closed, and is opened when the cartridge 2 is inserted into the optical disk device. When the shutter 9 is fully opened, the size of the opening is about 36 mm as described above, and the objective lens 10, the actuator 11, the carriage 3, the laser element 13, the light receiving element 14, the base 15, the turntable 5, and the spindle motor All the mechanical components of the optical pickup drive, such as the optical pickup drive 4, are incorporated in the opening of the shutter 9 having a size of 36 mm.

FIGS. 3 (a) and 3 (b) are a plan view and a cross-sectional view, respectively, of 17 mm in the optical disk device corresponding to the cartridge according to the present invention.

In FIG. 3, the optical disk apparatus having a front bezel 17 on the front side has an optical pickup mechanism for reading information from the optical disk 1 in the center of the inside thereof, and a clamp arm for clamping the optical disk 1. 16 and a front bezel 17
And an eject mechanism 18 for pushing out.

FIG. 4 is a plan view for explaining the positional relationship between the optical pickup drive of the present invention and the cartridge 2 and their sizes.

The opening of the cartridge 2 has a shutter 9
Slides sideways and opens about 36m wide. The optical pickup drive is housed in it, and the optical pickup drive is usually supported by an elastic member such as silicon rubber to absorb various vibrations and shocks, and slight vibration (displacement) at the time of vibration or shock 0.5 m from the edge to the edge of the opening to the opening of the cartridge 2 to generate
Provide clearance of m or more.

Opening edge Length × width = 36 mm × 86 mm Optical pickup drive Length × width = 35 mm or less × 85 mm or less This makes the size of the optical pickup drive resistant to vibration and shock.

FIG. 5 is a plan view showing the positional relationship with the spindle motor 4 when the carriage 3 of the optical pickup drive of the present invention moves from the outside (OUT) to the inside (IN).

As described above, in the present invention,
Since the entire optical pickup drive can be accommodated in the opening area of the cartridge 2, the thickness can be reduced. One of the necessary conditions for accommodating the optical pickup drive in the cartridge 2 is that a part of the carriage 3 is located below the spindle motor 4, which allows the carriage 3 to be inserted in the opening direction. The projection area can be reduced.

That is, in the conventional structure, the spindle motor is a DC brushless type circumferentially opposed motor which is a standard specification product of a motor maker. Therefore, even in the thin type, the outer diameter is 24 to 28 mm and the thickness is about 7 to 10 mm. In most cases, a dead space is created due to interference with the carriage. For this reason, there has been a restriction that there is no other choice than to design the carriage section at a position separated from the spindle motor.

Therefore, the present invention focuses on the fact that the optical disk drive itself can be made thinner if the optical pickup drive can be accommodated in the opening of the cartridge 2, and in order to achieve this, the spindle motor 4 is provided as compared with the conventional structure. Reduce the bulk in the height direction to about 1/3. As the spindle motor 4 having such a bulk, for example, a CD-ROM
And the like, and a peripherally facing motor or a surface facing motor used in an optical disk device.

In order to reduce the thickness of the circumferentially opposed motor, it is necessary to reduce the thickness of the core inside the motor. Therefore, the magnetic force is reduced and the torque is insufficient.

On the other hand, since the surface facing motor has no core, if it can be made thin without changing the coil specifications, it can be made thin without reducing the torque. In other words, the conventional coil is a discrete coil formed by winding, but if the coil is manufactured by an etching method (photographic method) in order to reduce the thickness, the pattern can be made denser (high space factor) and the coil thickness can be increased. Therefore, the distance between the magnet and the coil can be further shortened, and the magnetic flux density can be improved and the torque can be maintained or improved.

Therefore, by providing the spindle motor 4 having such a thin thickness, the spindle motor 4
The carriage 3 can be sunk into the lower part of the optical pickup drive, so that the thickness of the optical pickup drive can be reduced.

FIG. 6 is a sectional view showing the positional relationship with the turntable 5 when the carriage 3 of the optical pickup drive of the present invention moves from the outside to the inside.

As described above, in the present invention,
Since the entire optical pickup drive can be accommodated in the opening area of the cartridge 2, the thickness can be reduced. One of the necessary conditions for accommodating the optical pickup drive in the cartridge 2 is that a part of the carriage 3 is located below the spindle motor 4, which allows the carriage 3 to be inserted in the opening direction. The projection area can be reduced.

In the illustrated example, the turntable 5 is disposed above the spindle motor 4 so that the carriage 3 can sink under the thin spindle motor 4.

With this configuration, it is possible to design an optical pickup that can be accommodated in the opening of the cartridge 2, and the optical pickup can be made as thin as possible, so that the optical pickup drive can be made thinner.

FIG. 7 is a plan view showing the positional relationship with the spindle motor 4 when the laser element 13 or the light receiving element 14 of the optical pickup drive of the present invention moves from outside to inside.

In the optical pickup drive of the present invention, since the optical pickup drive is housed in the opening of the cartridge 2, the thickness can be reduced. However, the necessary conditions for housing the optical pickup drive in the cartridge 2 are as follows. Since a part of the laser element 13 or the light receiving element 14 of the carriage 3 is located below the spindle motor 4, the projected area is reduced.

That is, in the conventional configuration, there is not enough space around the spindle motor to accommodate the laser element and the light receiving element, and the dead space remains, and the laser element and the light receiving element are located in a portion separated from the spindle motor. There was a design constraint that it had to be placed.

On the other hand, according to the present invention, an optical pickup that can be housed in the opening of the cartridge 2 can be designed by making the laser element 13 and the light receiving element 14 go under the thin spindle motor 4. Therefore, the optical pickup protruding from the cartridge 2 can be made as thin as possible, so that the optical pickup drive can be made thinner.

FIG. 8 is a cross-sectional view showing the positional relationship with the turntable 5 when the laser element 13 and the light receiving element 14 move from the outside to the inside.

In the example shown in the figure, in order to make the spindle motor 4 thinner than the conventional motor, the thin spindle motor 4 is used.
The laser element 13 and the light-receiving element 14 are sunk into the lower part of the cartridge 2 so that an optical pickup that can be accommodated in the opening of the cartridge 2 can be designed. In addition, the thickness of the optical pickup drive can be reduced.

FIG. 9 shows an objective lens 10 and a laser element 13.
FIG. 4 is a plan view in which the centers of the light receiving element 14 and the turntable 5 are located substantially on a straight line.

In the present invention, it is necessary to reduce the size of the carriage 3 as a necessary condition for housing the optical pickup drive. For this purpose, the position of the objective lens 10, the positions of the laser element 13 and the light receiving element 14, and the turntable Since the center of 5 is located substantially on a straight line, the projected area is reduced.

That is, in the conventional structure, the optical path of the laser beam of the laser element or the light receiving element is perpendicular to the line connecting the turntable and the objective lens or 30 ° to 45 °.
At an angle. On the other hand, in the present invention, the positions of the objective lens 10, the positions of the laser element 13 and the light receiving element 14, and the center of the turntable 5 are arranged substantially in a straight line, so that these members overlap each other in the height direction. Therefore, the thickness of the optical pickup drive can be reduced.

FIG. 10 is a plan view showing the positional relationship of the optical integrated device in which the laser device 13 and the light receiving device 14 are integrated into one package.

As shown in FIG. 10, when the laser element 13 and the light receiving element 14, which are optical elements, are formed into one package, compared with the case where the two elements are separately arranged,
The projection area is reduced, and the size of the device can be reduced.

FIG. 11 is a plan view showing the positional relationship of an optical integrated device on which laser devices having different wavelengths are mounted.

As shown in FIG. 11, if the two laser elements 13a and 13b, which are optical elements, and the light receiving element 14 are made into one package, the two packages hold these laser elements 13a and 13b. Compared to
The projection area becomes smaller.

The optical disk drive capable of recording and reproducing includes, for example, CD, EB, C
D-ROM, first group of CD-R, DVD-ROM, D
There is a second group of VD-RAMs. The first group is a laser element 13a having a laser wavelength of 780 nm,
In the second group, a laser element 13b having a shorter wavelength of about 650 nm is used for high density.

By mounting these two lasers in a single package, the optical disk device is compact and capable of reproducing and recording on all the disks of the first group and the second group. An optical disk device having the following is obtained.

[0062]

According to the first aspect of the present invention, by housing the optical pickup drive in the opening of the cartridge,
The entire thickness of the optical disk device can be reduced.
Therefore, the conventional cartridge requires no unnecessary CD-RO.
The M drive has a thickness of 17 mm (2/3 inch), which is the mainstream. However, there is also a tendency for optical drive devices compatible with cartridges such as DVD-RAM to be 17 mm (or 12.7 mm). Thick drive can be achieved.

According to the second aspect of the present invention, even if the optical pickup drive swings up, down, left, and right due to external vibration, a gap is provided between the optical pickup drive and the cartridge opening so that the optical pickup does not contact the cartridge opening. , Stable behavior is maintained.

According to the third aspect of the present invention, since the rigidity of the carriage is improved by downsizing the carriage, it is possible to operate the carriage while maintaining stability against disturbances such as unnecessary vibration of the disk and the actuator.

According to the fourth aspect of the present invention, the weight of the carriage can be reduced by reducing the size of the carriage, so that the weight of the entire apparatus can be reduced, and the development to a portable device can be optimized.

According to the fifth aspect of the present invention, since the influence of the electromagnetic wave on the laser element and the light receiving element is suppressed, it is possible to read the optical disk more stably.

According to the sixth aspect of the present invention, since the heat generated by the laser element can be dissipated by utilizing the air flow caused by the rotation of the turntable, the stable characteristics of the laser element are maintained.

According to the seventh aspect of the present invention, since the assembling accuracy of each member can be controlled, the deviation of the optical axis can be reduced.
Even more stable reading characteristics of the optical disk can be obtained.

According to the eighth aspect of the present invention, since the characteristics of the laser element and the light receiving element can be prevented from changing over time and over time by being integrated with the package, the reading characteristics of the optical disk can be kept good.

According to the ninth aspect of the present invention, the existing CD-RO
In addition to M, CD-R, and CD-AUDIO, high-density DVD-ROM, DVD, and DVD-RAM displays can be read, and versatility is improved.

[Brief description of the drawings]

FIG. 1 is a plan view of an optical pickup drive housed in a cartridge of the present invention.

FIG. 2 is a sectional view of the optical pickup drive of FIG. 1;

3A and 3B are details of an example in which 17 mm can be achieved as an optical disk device compatible with a cartridge according to the present invention, wherein FIG. 3A is a plan view and FIG.

FIG. 4 is a plan view for explaining the positional relationship and size between the optical pickup drive and the cartridge according to the present invention.

FIG. 5 is a plan view showing the positional relationship with the spindle motor when the carriage of the optical pickup drive of the present invention moves from the outside to the inside;

FIG. 6 is a sectional view showing a positional relationship with a turntable when the carriage of the optical pickup drive of the present invention moves from the outside to the inside;

FIG. 7 is a plan view showing a positional relationship with a spindle motor when a laser element or a light receiving element of the optical pickup drive of the present invention moves from outside to inside.

FIG. 8 is a sectional view showing a positional relationship with the turntable 5 when the laser element 13 and the light receiving element 14 move from outside to inside.

FIG. 9 is a plan view in which the centers of the objective lens 10, the laser element 13, the light receiving element 14, and the turntable 5 are located substantially on a straight line.

FIG. 10 is a plan view showing a positional relationship of an optical integrated device in which a laser device and a light receiving device are integrated into one package.

FIG. 11 is a plan view showing the positional relationship of an optical integrated device on which laser devices having different wavelengths are mounted.

FIG. 12 is a cross-sectional view of a conventional optical disk device compatible with a cartridge, such as an optical disk device such as a PD.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Optical disk 2 Cartridge 3 Carriage 4 Spindle motor 5 Turntable 6 Substrate 7 Electrical parts 8 Housing 9 Shutter 10 Objective lens 11 Actuator 12 Feeding mechanism 13, 13a, 13b Laser element 14 Light receiving element 15 Base 16 Clamp arm 17 Front bezel 18 Eject mechanism

Claims (9)

[Claims] An objective lens for reading information from an optical disk, an actuator for driving the objective lens in a focus direction and a tracking direction, a carriage holding the actuator and moving from an inner circumference to an outer circumference of the optical disk, An optical disc apparatus having an optical pickup drive by a combination of a feed mechanism for sliding the carriage, a laser element and a light receiving element mounted on the carriage, a turntable for holding the optical disc, and a spindle motor for rotating the turntable. 3. The optical disk device according to claim 1, wherein each component is housed and arranged in the opening area of the shutter of the cartridge in which the optical disk is housed. 2. The optical disk device according to claim 1, wherein the vertical and horizontal bulks of the optical pickup drive have a size corresponding to an arrangement having a slight gap with respect to the opening of the cartridge. 3. The optical disk device according to claim 1, wherein a part of the carriage can be positioned below the spindle motor. 4. The optical disk device according to claim 1, wherein a part of the carriage can be positioned below the turntable. 5. The optical disk device according to claim 3, wherein the laser element or the light receiving element mounted on the carriage can be positioned below the spindle motor. 6. The optical disk device according to claim 4, wherein the laser element or the light receiving element mounted on the carriage can be positioned below the turntable. 7. The optical disk device according to claim 1, wherein the center of the objective lens, the laser element or the light receiving element, and the center of the spindle motor are arranged substantially in a straight line. 8. The optical disk device according to claim 7, wherein the laser element and the light receiving element are integrated as one package. 9. The laser device according to claim 1, wherein each of the laser elements has a different wavelength.
9. The optical disk device according to claim 8, wherein the optical disk device is a combination of a plurality of optical disks.