JPH0821205B2 - Optical disc player - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention irradiates an optical disc on which information signals such as audio signals and video signals are recorded with a laser beam emitted from a laser light source such as a semiconductor laser. The present invention relates to an optical disc player configured to read and reproduce the above information signal.

[Conventional technology]

The optical disc player has a disc table that is driven to rotate by a spindle motor. An optical disc is mounted on the disc table for rotation operation, and an optical puck-up device having a semiconductor laser is installed on the inner circumference side of the optical disc. From the outer peripheral side to the outer peripheral side in the normal direction of the recording track formed on the optical disk, and the laser beam emitted from the semiconductor laser is vertically irradiated from the lower surface side of the optical disk to the recording track. Is tracked, and a predetermined information signal recorded on this recording track is read and reproduced.

On an optical disc, which is a signal recording medium used in an optical disc player having such a configuration, an information signal such as a voice signal is pulse-coded and recorded at high density as a pit row having minute unevenness, so that a musical tone is generated. For so-called compact discs with recorded signals, the diameter is 12
The size set to cm is used as the standard size.
As described above, since an optical disk as a recording medium used in an optical disk player for reproducing a musical sound has a small diameter, an attempt is made to reduce the size and thickness of the optical disk player itself for reproducing the optical disk. As shown in FIG. 1, it has been considered to reduce the inner peripheral shape of the outer casing 1 to a rectangular shape in which the outer peripheral diameter of the optical disk 2 forms a substantially inscribed circle. Further, in order to reduce the thickness of the optical disc player, the optical pickup device 3 configured as shown in FIG. 2 is used. The optical pickup device 3 includes an objective lens 4 that focuses a laser beam and irradiates the signal recording surface of the optical disc 2 vertically.
Laser beam is emitted from the semiconductor laser 6 so as to be orthogonal to the optical axis of the optical disc 2, that is, parallel to the surface of the optical disc 2 mounted on the disc table 5, and the laser beam is deflected by 90 degrees by the reflecting mirror 7 to The light is guided to the objective lens 4 via the four-wave plate 8. Therefore, in this optical pickup device 3, the semiconductor laser 6 is attached to the end of the housing 18 so that the laser beam is emitted in the direction orthogonal to the optical axis of the objective lens 4, and the laser beam is used for signal reading. Main beam and a diffraction grating 9 that splits it into two sub-beams for tracking servo, a beam splitter 10 that splits and returns the return light beam reflected from the optical disk 2 to the Fort detector 12, and the laser beam is controlled to be parallel light. The optical system block including the collimating lens 11 and the like is incorporated in the housing 18 so that the optical axis thereof is orthogonal to the optical axis of the objective lens 4. Further, the beam splitter 10 includes an intermediate lens 13 and a cylindrical lens 14 which guide a return light beam, which is reflected from the optical disc 2 and which is reflected from the optical disc 2 and read out the information signal recorded on the optical disc 2, to a photodetector 12. The optical axis of the optical system block is also incorporated in the housing 18 so as to be orthogonal to the optical axis of the objective lens 4.
The optical pickup device 3 configured so that the laser beam emitted from the semiconductor laser 6 enters the objective lens 4 in the direction orthogonal to the optical axis of the objective lens 4 in this manner. The thickness of the optical disk player can be made thinner than that of the optical disk player, and the optical disc player to which the optical pickup device 3 is attached can also be made thinner.

[Problems to be Solved by the Invention]

As described above, downsizing of the outer casing 1 and this outer casing 1
It is conceivable that the optical pickup device 3 disposed inside the optical pickup device can be made thinner to reduce the size and thickness of the entire device. However, the conventionally proposed optical disc player is as shown in FIG. The optical pickup device 3 is mounted so as to be transferred in parallel with the exterior wall portion 15 of the rectangular exterior housing 1, and the objective lens is extended from the inner peripheral side to the outer peripheral side of the optical disc 2 mounted on the disc table. The recording track is traced by the laser beam transmitted from the optical disc 4, and the information signal recorded on the recording track is obtained. That is, the optical pickup device 3 includes a pair of guide shafts arranged in parallel with the exterior wall portion 15 of the exterior housing 1.
The optical axis of the objective lens 4 is movably attached via 16, 17 so as to be aligned with the center line of the optical disk 2 placed on the disk table, and is transferred and operated by a transfer means such as a drive motor (not shown). Is configured.

By the way, as described above, in the optical disc breaker in which the outer diameter of the optical disc 2 is reduced to the size of a rectangular shape having a substantially inscribed circle, the entire surface on the upper surface side of the outer casing 1 is mounted on the disc. Made as part 20. This disc mount
20 is closed with a lid so as to be opened so that the optical disc 2 can be loaded and unloaded. The objective lens 4 of the optical pickup device 3 for transmitting the laser beam to the optical disc 2 is exposed to the disc mounting portion 20. Therefore, there is a risk that the objective lens 20 may be touched by a finger when the optical disc 2 is loaded and unloaded by opening the disc mounting portion 20 to stain the objective lens 20.

In particular, as shown in FIG. 1, in the case where the optical pickup device 3 is mounted so as to be moved in parallel with the front wall portion 1a of the exterior housing 1, the optical disc 2 is gripped when it is loaded or unloaded. The objective lens 4 is positioned on the side where the fingers are touched. Then, when the objective lens 4 is touched with a finger and is soiled,
There is a possibility that an error in reading the read information may occur due to irregular reflection of the laser beam that passes through.

Therefore, the present invention aims to reduce the size of the optical disc player, and at the time of exchanging the optical disc player, the objective lens of the optical pickup device which is exposed to the disc mounting portion is prevented from being easily touched by fingers, so that the objective lens is prevented from being soiled. The present invention has been proposed for the purpose of providing an optical disc player capable of preventing the occurrence of an information signal reading error.

[Means for solving the problem]

Therefore, in order to achieve the above-mentioned object, the optical disc player according to the present invention performs a disc rotation driving means for rotationally driving an optical disc to be placed, and reads information recorded on the optical disc. An optical pickup device is provided, and a housing that accommodates the optical pickup device, and a lid body that is rotatably supported on one side portion of the housing via a support means and that opens and closes the upper surface of the housing, the optical pickup device,
It is located on the side of the supporting means and is disposed inside the housing, and is supported so as to be movable in a substantially diagonal direction of the housing around the disk rotation driving means.

[Action]

In the optical disc player according to the present invention, the optical pickup device is located in the support means side, is disposed in the housing, and is transported in a substantially diagonal direction about the disk rotation driving means of the housing. Further, in the optical disc player, since the optical pickup device is located on the side of the supporting means, the optical disc is mounted without touching the objective lens with fingers.

〔Example〕

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

The optical disc player according to the present invention is shown in FIGS.
As shown in FIGS. 5 and 5, the inner peripheral shape of the outer casing 21 constituting the player main body is made into a rectangular shape whose outer diameter R of the optical disc 22 reproduced by this player is an inscribed circle, that is, the outer casing. One side of the inner peripheral edge of 21 is formed in a rectangular shape with a length substantially equal to the diameter of the optical disc 22. On the front side exterior wall portion 23 of the exterior housing 21 thus formed, the power switch operation button 24, the play / pause button 25, the next song selection button 26, and the fast forward operation button which constitute the operation portion of this optical disc player. 27, operation buttons such as a designated music selection button 28, a reverse operation button 29, an eject button 30 and the like, and a timer or a display portion 31 of the address of a performance music piece are provided.

At the center of the outer casing 21, a disc rotation drive mechanism for rotating the optical disc 22 is arranged. This disk rotation drive mechanism is arranged so that the axis of the spindle 33 is substantially aligned with the approximate center of the exterior housing 21, and the disk table 32 on which the optical disk 22 is mounted is integrally mounted on the tip side of the spindle 33. It is installed. Above spindle 33
As shown in FIG. 6, the thrust bearing is inserted into a bearing 35 attached to the lower surface side of the chassis substrate 34 to be rotatably supported and is also attached to the bottom face side of the chassis substrate 34. The taper-shaped base end 33a is supported and attached to 36. On the base end side of the spindle 33 attached in this manner, a disc plate 37 made of metal and formed in a disc shape is integrally fitted and disposed. An elastic theory 39 made of an elastic material such as rubber is fitted and disposed in a fitting portion 38 formed by cutting out the outer peripheral portion of the upper surface side of the disk plate 37 facing the disk table 32 in a stepwise manner. . The upper surface of the elastic theory 39 is a tapered drive wheel rolling contact surface 40, and a drive motor 42 mounted parallel to the optical disk 22 surface via a motor support member 41 mounted on the lower surface side of the chassis substrate 34. Reduction gear mechanism 43 on output shaft
A drive wheel 45 mounted on a drive shaft 44 connected via a drive wheel 45 having an outer peripheral surface formed into a tapered surface corresponding to the drive wheel rolling contact surface 40 is in rolling contact, and the rotational driving force of the drive motor 42 is applied to the spindle.
It is designed to communicate to 33.

In this way, by adopting a so-called disc drive system in which the drive wheel 45 driven by the drive motor 42 is rollingly contacted with the upper surface of the disc plate 37 attached to the base end side of the spindle 33 to drive the spindle 33, Since the output shaft of the drive motor 42 can be mounted in parallel with the surface of the optical disc 22 mounted on the disc table 32, the spindle drive mechanism can be made thin, which in turn contributes to the thinning of the optical disc player.

The drive system of the disc table 32 is not limited to the disc drive system as described above, and a so-called direct drive system in which the spindle 33 is directly connected to the output shaft of the drive motor may be adopted.

The exterior housing in which the disk table 32 is arranged as described above.
An optical pickup device 46 for irradiating a laser beam on the signal recording surface of the optical disc 22 mounted on the disc table 33 and reading and operating an information signal such as a musical tone signal recorded on the optical disc 22 is provided in the inside of 21. The objective lens 47 is attached so as to face the signal recording surface of the optical disc 22. The optical pickup device 46 includes a front side exterior wall portion 23 provided with various operation buttons of the exterior casing 21 and the like, and a rear side exterior wall portion 48 parallel to the front side exterior wall portion 23 and opposite side exterior wall portions. Optical disc 22 at an angle inclined to 49,50
The optical disk 22 in the radial direction about the rotation center of
It is attached so that the vehicle can be operated from the inner peripheral side to the outer peripheral side.

By the way, the optical pickup device used in the present invention
In order to reduce the thickness of 46 as well, similar to the one used in the optical disc player shown in FIGS. 1 and 2 described above,
The laser beam is configured to be incident on the objective lens 47 in a direction perpendicular to the optical axis O _R thereof. That is, the housing as is emitted in a direction in which the laser beam emitted from the semiconductor laser 51 as a light source as shown in FIG. 7 (A) and (B) from which is perpendicular to the optical axis O _R of the objective lens 47 Attached to the end of 52, a diffraction grating 54 for separating the laser beam into a main beam for signal reading and two sub-beams for tracking servo, a beam splitter for reflecting the laser beam reflected from the optical disc 22 to a photodetector 55. 56, an optical system block including a collimator lens 57 for polarizing a laser beam into parallel light is installed in the housing 52 such that its optical axis O _L is orthogonal to the optical axis O _R of the objective lens 47. In addition, the beam splitter 56
It is composed of a cylindrical lens 59 of the kamaboko type, which guides the return light reading the information signal recorded on the optical disc 22 reflected in the optical disc 22 reflected in the direction of direction to the photodetector and astigmatizes the return light. the optical axis O _P of the optical system block of the return light side are incorporated within the housing 52 so as to be perpendicular to the optical axis O _R of the objective lens 47. And
The laser beam emitted from the semiconductor laser 51 has its optical path deflected in the direction of 90 degrees by the reflecting mirror 60 attached to the lower surface side of the objective lens 47, and then the quarter-wave plate 61 that rotates its polarization axis by 45 degrees. The light is vertically incident on the objective lens 47 via.

Further, the objective lens 47 that focuses the laser beam emitted from the semiconductor laser 51 and irradiates the signal recording surface of the optical disk 22 perpendicularly, or transmits the return light reflected from the signal recording surface, has its optical axis. Is supported by a biaxial drive device 65 that drives the objective lens 47 in two axial directions that are orthogonal to each other and the tracking direction of the recording track that is orthogonal to the focus direction and the optical axis direction. The objective lens 47 is supported by a biaxial drive device 65 so that focus control for controlling the recording track to be positioned within the depth of focus of the laser beam and accurate tracking of the recording track by the laser beam. Tracking control for controlling is performed.

The optical pickup device 46 configured as described above has an objective lens that has a large outer shape when transferred so as to trace the outermost recording track of the optical disc 22.
The biaxial drive device 65, in which 47 is movably supported in the biaxial direction, is provided at a corner portion formed by the back side exterior wall portion 48 of the exterior housing 21 and one side exterior wall portion 49 orthogonal to this. So that the optical axis between the beam splitter 56 and the reflecting mirror 60 is substantially parallel to the rear side exterior wall portion 48, that is, the laser beam is on the surface of the optical disc 22 mounted on the disc table 32. The semiconductor laser 51 is disposed in the exterior housing 21 so as to be emitted from the semiconductor laser 51 in parallel with the backside exterior wall portion 48.

By the way, the tracking of the recording track by the laser beam irradiated to the signal recording surface of the optical disk 22 through the objective lens 47 is performed because all the recording tracks from the inner peripheral side to the outer peripheral side of the optical disk 22 are traced. It must be done in the direction normal to the recording track. Therefore, in the optical pickup device 46 arranged as described above, the objective lens 47 is provided in the exterior housing 21 so that the objective lens 47 is transferred in the normal direction of the recording track, that is, in the radial direction passing through the center of the optical disk 22. Mounted. That is, the optical pickup device 46 includes a pair of guide shafts 10 mounted on the chassis substrate 34 in parallel with the direction in which the objective lens 47 should be transferred.
1, 102, slide bearings 54 fitted in the housing 52,
The recording track of the optical disk 22 is entirely tracked from the inner circumference side to the outer circumference side by being inserted through the 55 and being guided and transferred by the guide shafts 101 and 102.

In this way, the pair of guide shafts 10 for guiding the optical pickup device 46 that is disposed and transferred in the exterior housing 21.
1, 102 are attached to the rear side exterior wall portion 48 with an inclination, and in the present embodiment, are attached on the chassis substrate 34 with an inclination angle θ of about 45 degrees.

In this way, the optical pickup device 46 is slanted with respect to the rear side exterior wall portion 48 of the exterior housing 21 so that the optical axis of the objective lens 47 reaches the outermost recording track of the optical disc 22. At this time, the two-axis drive device 65, which is large in size, is attached to the rear side exterior wall portion 48 and one side exterior wall portion 49.
Since it can be projected to the corner formed by the and the outer peripheral edge of the optical disc 22 as an inscribed circle without increasing the size of the rectangular outer casing 21 from the inner peripheral side to the outer peripheral side of the optical disc 22. The recording track of can be operated for tracking.

In addition, the pair of guide shafts 101 and 102 is the chassis substrate 3
Although the both ends are inserted and supported in the insertion holes of the mounting piece 103 formed by cutting and raising a part of 4,
One guide shaft 101 is fixedly attached with high precision so that the traveling direction of the optical pickup device 46 can be accurately positioned, and the other guide shaft 102 is attached to the one guide shaft 101.
The optical pickup device 46 is mounted so that its mounting state can be adjusted so as to absorb the mounting error and the machining accuracy error of the bearing of the optical pickup device 46.

As described above, the optical pickup device slidably attached to the pair of guide shafts 101 and 102 arranged to be inclined with respect to the rear exterior wall portion 48 through the slide bearings 104 and 105.
46 designates the output shaft 106 on one side exterior wall part 49 of the exterior housing 21.
The pickup drive motor 108 mounted on the lower surface side of the chassis substrate 34 via the motor support member 107 so as to be parallel to the above is operated to run from the inner peripheral side to the outer peripheral side of the optical disk 22. The pickup drive motor 108 and the optical pickup device 46 are the same as the drive motor 1 described above.
The worm gear 109 attached to the output shaft 106 of 08 and the guide shaft 101 on one side of the housing 52 of the optical pickup device 46,
A rack 110 mounted so as to be parallel to 102 is connected with a coupling gear mechanism 114 composed of first, second and third gears 111, 112, 113 which are meshed with each other and constitute a speed reduction mechanism, and are connected to each other. The driving force of the drive motor 108 is reduced and transmitted to the optical pickup device 46 so that the optical pickup device 46 is operated for traveling.

A lid 67 is attached to the outer casing 21 to cover the mounting portion 66 of the optical disc 22 formed on the upper surface side of the outer casing 21. The lid body 67 supports the base end portion on the state side of the rear side exterior wall portion 48 via a pivoting hinge portion 68 which is a supporting means of the lid body 67, and rotates so that the disc mounting portion 66 can be opened and closed. It is movably mounted. In addition, an optical disk 22 placed on the disk table 32 in cooperation with the disk table 32 is sandwiched between the central portion on the inner surface side of the lid body 67, and the optical disk 22 serves as the disk table 32. A chucking member 69, which is adapted to rotate integrally, is rotatably attached.

The optical disc play configured as described above,
Since the optical pickup device 46 is designed to perform the feeding operation in a radial direction centering on the spindle 33 of the disk rotation drive device and in a tilted direction which is non-parallel to the front side exterior wall portion 23 of the exterior housing 21, The objective lens 47 of the pickup device 46 can be positioned from the center of the outer wall portions 49, 50 on both sides to the corner portion side of the outer casing 21 having a rectangular shape.
In particular, in the above-described embodiment, the objective lens 47 can be positioned on the corner portion side of the rear side exterior wall portion 48 side on which the lid 67 is supported. Therefore, as shown in FIG. 8, when the lid 67 is opened and the optical disc 22 is attached / detached to / from the disc mounting portion 66, it becomes difficult for the fingers holding the optical disc 22 to touch the objective lens 47. Further, the monster lens is not limited to the case where the optical disc 22 is attached and detached, and even when the lid 47 is opened by operating the eject button 30 in the operation portion arranged on the front side exterior wall portion 23. Since 47 is located at a position separated from the front exterior wall portion 23 where the operation portion is arranged, careless contact of fingers is prevented.

Further, the optical pickup device 46 travels at an angle inclined with respect to the rear side exterior wall portion 48 of the exterior housing 21, so that the optical axis of the objective lens 47 reaches the outermost recording track of the optical disc 22. The large-sized biaxial drive device 65 can be located at the corner portion of the outer casing 21, and the outer casing 21 can be formed in a rectangular shape in which the outer peripheral edge of the optical disc 22 is an inscribed circle. Is possible.

〔The invention's effect〕

As described above, the optical disc player according to the present invention is configured so that the optical pickup device is moved in a substantially diagonal direction centering on the disc rotation driving means of the housing located on the support means side of the lid body. Therefore, it is possible to position the objective lens at a position where it is difficult for fingers to hold the optical disc when the optical disc is attached to or detached from the disc mounting portion formed on the upper surface of the housing.

Therefore, this optical disc player can avoid contact of the fingers with the objective lens when the optical disc is attached or detached, prevent contamination of the objective lens, and prevent occurrence of reading error.

Furthermore, since this optical disc player is configured so that the optical pickup device is moved in a substantially diagonal direction centering on the disc rotation drive means of the housing, it can be made smaller and thinner.

[Brief description of drawings]

FIG. 1 is a plan view showing an optical disc player which is a premise of the present invention, and FIG. 2 is a schematic sectional view showing an optical pickup device used in the optical disc player. FIG. 3 is a perspective view showing an optical disc player according to the present invention, FIG. 4 is a plan view thereof, and FIG. 5 is a bottom view thereof. FIG. 6 is a side view showing a drive mechanism of a disc table which constitutes the optical disc player.
FIG. 7 shows an example of an optical pickup device used in the optical disc player, and FIG. 7 (A) is a sectional view taken along the line AA of FIG. 5, and FIG. 7 (B).
FIG. 6 is a sectional view taken along line BB of FIG. FIG. 8 is a perspective view of the optical disc player showing a state in which the optical disc is loaded and unloaded. 21 …… Exterior case 23 …… Front side exterior wall 24 …… Power switch operation button 30 …… Eject button 32 …… Disc table 33 …… Spindle 46 …… Optical pickup device 47 …… Objective lens 66 …… Disc mounting Part 67 ... Lid

Continuation of the front page (56) Reference JP-A-57-164479 (JP, A) Actually opened 56-174103 (JP, U) Actually opened 55-7177 (JP, U)

Claims (1)

[Claims] 1. A disk rotation driving means for rotationally driving an optical disk to be placed, a housing for accommodating an optical pickup device for reading information recorded on the optical disk, and one side of the housing. A lid body that is rotatably supported via a supporting means to open and close the upper surface of the housing, and the optical pickup device is disposed inside the housing on the side of the supporting means. An optical disc player, wherein the optical disc player is supported so as to be movable in a substantially diagonal direction of the above-mentioned housing around a disc rotation driving means.