JPH05217356A - Optical information recording / reproducing device - Google Patents

Abstract

(57) [Abstract] [Purpose] Power is supplied to the spindle motor unit by a configuration that is compact and dustproof, and that does not affect the motor rotation. [Structure] In order to supply power to the spindle motor unit 8 provided in the housing 12 from the outside, a power supply printed board 46, a power supply pattern, a spindle motor drive power supply member including a wire 48 and a socket 49, and a printed board.
In order to connect with the connector 24 provided in 17, a through hole 73 into which the connector 24 is inserted is formed in the housing 12,
The printed circuit board 17 is fixed so as to close the bottom surface of the housing 12, and the connector 24 is positioned in the through hole 73.

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 / reproducing / erasing an optical information recording medium such as an optical disk or a magneto-optical disk.

[0002]

2. Description of the Related Art Like an optical information recording / reproducing apparatus disclosed in Japanese Patent Laid-Open No. 63-13139, a total reflection prism and an objective lens, which are optical members for irradiating a light spot on a recording surface of a disk, are provided. A wire rod or a flexible cable is used to externally supply power to a pickup body that holds and moves along the recording surface of the disc, or to a spindle motor provided with a turntable for rotationally driving the disc. A configuration (a power supply configuration of a spindle motor is not disclosed in the above publication) is known.

[0003]

In the above-mentioned prior art, since the wire rod or the flexible cable is introduced from the outside into the housing holding the pickup body and the spindle motor, the introduction passage must be formed in a part of the housing. .. Therefore, dust easily enters the housing through the gap between the wire or flexible cable and the introduction passage, and dust adheres to the internal optical components, which causes a problem of deterioration of optical characteristics.

Further, a three-phase motor which is usually used as a spindle motor requires eleven power supply units in addition to a power supply unit for position detecting means (for example, a Hall element) of the rotating unit. If the wire is provided on the printed circuit board on the outer peripheral portion of the spindle motor, the wire coming out of the power feeding portion and the rotating portion of the spindle motor are likely to come into contact with each other, and the contact may lower the rotational accuracy or damage the parts.

It is an object of the present invention to provide an optical information recording / reproducing apparatus capable of supplying electric power to a spindle motor unit with a structure that can be downsized and dust-proof and that does not affect motor rotation.

[0006]

To achieve the above object, a first means of the present invention is to provide a spindle motor unit for rotationally driving an optical information recording medium, a housing for supporting the spindle motor, and a spindle. In an optical information recording / reproducing apparatus including a motor driving power feeding member, a connector to which the spindle motor driving power feeding member is connected is provided on a printed circuit board, and a through window is formed in the housing corresponding to the connector, It is characterized in that the substrate is fixed to the bottom surface of the housing and the connector is inserted into the through hole to connect the power supply member for driving the spindle motor and the connector.

A second means is characterized in that, in the above-mentioned first means, the drive circuit for the spindle motor unit is provided on a printed circuit board outside the housing.

A third means is an optical information recording / reproducing apparatus in which a spindle motor unit for rotationally driving an optical information recording medium is composed of a rotation driving section, a power supply printed board and a holding base. The power supply printed circuit board is provided with a rotation drive unit power supply pattern that is connected to the connector, and the rotation drive unit power supply pattern is arranged in a plane perpendicular to the rotation axis of the spindle motor and in the installation direction of the connector. Characterize.

A fourth means is characterized in that, in the above-mentioned third means, a rotation drive unit power feeding pattern is arranged between a plurality of screws for fixing the holding substrate to the housing.

[0010]

According to the above-mentioned first means, the bottom surface of the housing is closed by the printed circuit board, and the power supply member for driving the spindle motor is connected to the connector at the through window portion of the closed housing. Dust will not enter the housing at the power feeding portion.

According to the second means, by installing the drive circuit which easily generates heat during operation outside the housing, temperature rise in the housing can be suppressed and deterioration of various characteristics due to temperature rise can be prevented. You can

According to the third means, the power supply pattern provided on the printed circuit board of the spindle motor is arranged in the connector installation direction and in a plane perpendicular to the rotation axis of the spindle motor. Since the wire or the like connecting the power feeding pattern and the connector does not come out in the rotation axis direction, contact with the rotating portion of the spindle motor can be eliminated,
Prevents damage to parts and deterioration of rotation accuracy.

According to the fourth means, by disposing the power supply pattern between the plurality of screws for fixing the spindle motor, the space for disposing the power supply pattern can be reduced, and the size of the device can be reduced. Space saving can be achieved.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing a schematic configuration of an embodiment of the present invention. The exterior part of the apparatus is a front bezel 1 into which a disc cartridge (not shown) is inserted, and left and right side frames 2 and 3. , A rear frame 4, and a magneto-optical disk (hereinafter referred to as a disk), which is an optical information recording medium housed in a disk cartridge, is installed in a spindle motor described later in the exterior portion. An optical pickup including a loading unit 6, an emission system in which an optical member for emitting a light beam to the disc as described later is installed, and a detection system in which an optical member for detecting information by reflected light from the disc is installed. The unit 7 and the spindle motor unit 8 that drives the disc to rotate are emitted from the optical pickup unit 7. A lens actuator unit 9 equipped with an objective lens L for converging a light beam to irradiate a disc as a light spot, a pair of seek units 10 composed of a linear motor for moving the lens actuator unit 9 in the disc radial direction, A magnetic head unit 11 mounted on the loading unit 6 and applying a magnetic field to the disk is provided, and the units 6 to 11 are supported or fixed in the same housing 12.

The housing 12 is screwed to the side frames 2 and 3 via a vibration-proof rubber 13, and a circuit portion is provided to drive each portion of the unit. The circuit board is provided with a connector 14 for supplying power and transmitting and receiving signals to and from the host computer, and is fixed to the side frames 2 and 3 on a first substrate 15
And a second substrate 16 fixed to the housing 12 portion of the optical pickup unit 7, and a third substrate 17 fixed to the lower portion of the housing 12.

The first to third boards 15 to 17 are printed boards, the first board 15 mounts the controller system circuit of each part, and the second board 16 is the emitting system and the detecting system of the optical pickup unit 7. A circuit is mounted, and the third board 17 has a home position sensor 19, a light emitting element 20, and a cartridge presence / absence sensor 2
1, loading switch 22, eject switch 23,
A motor drive circuit connector 24, a seek unit drive circuit connector 25, a magnetic head drive circuit connector 26, etc. are mounted, and the first cable 27 of the first board 15 is connected to the second board 16.
(→) and the second and third cables 28 and 29 are connected to the third board 17
Is connected to (→, →).

In FIG. 1, 30 is a door unit for opening and closing the cartridge insertion opening 1a of the front bezel 1, 31 is an eject button provided on the front bezel 1, 32 is one side of the loading unit 6 and the housing 12. It is a shield plate installed in.

A substantially central portion of the housing 12 is a moving optical system holding portion 34, which is a moving optical system having a lens actuator 9 and a deflection prism (not shown), and a pair of guides for moving the carriage 35. The guide shaft 36 and the pair of seek units 10 for moving the carriage 35 by electromagnetic action are installed.

The side of the housing 12 adjacent to the moving optical system holding portion 34 is a motor holding portion 37 for holding the spindle motor unit 8, and is a perspective view showing the relationship between the housing and the spindle motor unit in FIG. The spindle motor unit 8 includes a turntable 40, a rotary drive unit 41 having a spindle motor built therein, a small diameter portion 42a and a large diameter portion 42b, and is a holding substrate having a screw insertion hole 42c formed therein. And a flat portion 42. On the other hand, the motor holding portion 37 of the housing 12 is formed with a hole portion 43 to be fitted with the lower protrusion 42d of the rotation driving portion 41, and further, the three screw insertion holes 42c formed in the circular flat surface portion 42. Positioning protrusion with female thread formed at the position corresponding to
44 are projected.

In the spindle motor unit 8, after the circular flat portion 42 is placed and positioned on the protrusion 44, the screw 45 is inserted into the screw insertion hole 42c and screwed into the female screw of the protrusion 44. It is fixed to the housing 12. The reason why a part of the circular flat portion 42 is the small diameter portion 42a is to reduce the size of the housing 12 without hindering the movement of the carriage 35 in the direction of the spindle motor unit 8.

Further, the power supply printed board 46 is fixed so as to be sandwiched by the lower part of the rotary drive part 41 and the upper surface of the circular flat part 42, and power is externally supplied to the rotary drive part 41. That is, a rotation drive unit power supply pattern 47 is formed on the surface of the power supply printed board 46, and this rotation drive unit power supply pattern 47 is in a plane perpendicular to the spindle motor rotation shaft 41a of the rotation drive unit 41. And the third board 17 on which the motor drive circuit connector 24 shown in FIG. 1 is installed.
It is provided so that it is in the same direction as. One end of a wire material 48 (or a flexible cable) is fixed to each of the plurality of power supply parts of the rotation drive part power supply pattern 47, and the other end of each wire material 48 is provided in a socket 49. Since the rotation drive section power supply pattern 47 is provided between the screws 45 of the power supply printed board 46, space can be saved, and the component members in the vicinity of the spindle motor unit 8 can be brought closer to the unit side portion, thereby achieving miniaturization. .. In this embodiment, the power supply printed board 46, the rotary drive power supply pattern 47, the wire 48 and the socket 49 constitute a spindle motor drive power supply member.

FIG. 3 is a perspective view showing an optical system of the optical pickup unit 7 shown in FIG. 1. A light beam B emitted from a semiconductor laser (LD) 50 is converted into parallel light by a coupling lens (CL) 51, and a The light is incident on the 1-polarization prism (BS) 52. The light beam B reflected by the first surface 52a of the first BS 52 is
The light passes through the second surface 52b of the BS 52, enters the carriage 35, is reflected by the deflection prism (DP) 53 in the carriage 35, and is guided to the objective lens L. The light flux is focused by the objective lens L and irradiated as a light spot of about 1 μm on the recording surface of the disc. The reflected light R reflected by the recording surface of the disc is passed through the objective lens L again, reflected by DP53, and incident on the first BS52. The second side 52 of this first BS52
At b, the reflected light R is reflected as focused light in the direction of the various photodiodes forming the detection system.

A semiconductor laser photodiode (LD-PD) 54 for receiving a part of the light beam B reflected by the second surface 52b of the first BS 52 is provided near the LD 50 to stabilize the light beam B emitted from the LD 50. The control signal to be converted is detected. LD50, CL51, first BS52, LD
An emission system is configured by PD54 and the like.

The reflected light R reflected by the second surface 52b of the first BS 52 is partially reflected by the knife edge prism (KEP) 55 toward the second BS 56 side, and the reflected light R not reflected by the KEP 55 is detected as a focusing signal. The light is incident on the photo diode (FO-PD) 57 for light. This FO-PD57 is
The light receiving surface 57a is divided (in this embodiment, divided into four), and the distance signal between the objective lens L and the disk (focusing signal of the light spot) can be detected by taking the difference signal in the X direction of FIG. Reflected light R reflected by the KEP55
Is partially reflected by the second BS 56, and the reflected light R reflected is reflected by a photodiode (MO-P) for detecting an information signal.
D) Reflected light R that is incident on 58 and transmitted through the second BS 56
Is a photodiode for tracking signal detection (TR-
It is incident on PD) 59. The light receiving surface of the TR-PD59 is also divided, and the position error signal (light spot tracking signal) between the objective lens L and the information track on the disc can be detected by taking the difference signal in the Z direction in FIG.

FIG. 4 is a perspective view for explaining the fixing structure of the LD 50. The LD 50 is fixed to the LD holder 60,
A CL cell holder 61 is provided on the LD holder 60 so as to be relatively movable on the XZ plane, and the CL 51 is fixed to the CL cell holder 61. By adjusting the positions of the LD holder 60 and the CL cell holder 61, L
The emission angle of the light beam B emitted from D50 is set. After this adjustment is completed, the LD holder 60 and the CL cell holder 61 are screwed. The CL 51 is movable in the optical axis direction in the CL cell holder 61, is adjusted so that the light flux B after passing through the CL 51 is made into parallel light, and is screwed after the adjustment.

The CL cell holder 61 is provided with an LD holder 60 on a mounting side portion 62a of an emission / detection system holding portion 62 integrally formed next to the moving optical system holding portion 34 of the housing 12 of FIGS. Similarly, it is provided so as to be relatively movable on the XZ plane, is adjusted so that the optical axis of the light beam B to the objective lens L and the optical axis of the objective lens L are aligned, and is screwed after the adjustment.

Further, the first BS 52 and the second BS 56 emit and
The KEP 55 mounted on the bottom of the detection system holding part 62 and the KEP 55 arranged in the emission / detection system holding part 62 as shown in FIG.
It is bonded to the holder 63. The KEP holder 63 is movable in the X direction (FIG. 3) with respect to the housing 12,
Each photodiode (PD) 57, 58, 59 by KEP55
The light amount of the reflected light R guided to F is adjusted, and after the adjustment, it is screwed from the lower surface of the housing 12.

Further, the FO-PD57 and TR-PD59 are provided on the side portion 62b of the emission / detection system holding portion 62 of the housing 12 as shown in the perspective view for explaining the fixed structure of the FO-PD57 in FIG. It is screwed after the position adjustment via the printed board 64. Similarly, the MO-PD 58 is also fixed to the side portion of the emission / detection system holding portion 62 after position adjustment.

Output / detection system holding portion 62 of the housing 12
As mentioned above, a large number of optical members are installed in
If dust generated in the adjacent moving optical system holder 34 flows in and adheres to the optical member, the optical characteristics of the optical member are deteriorated and the signal detection is affected. Therefore, in this embodiment, as shown in FIG. 2, a partition wall 65 is erected between the moving optical system holding portion 34 of the housing 12 and the emitting / detecting system holding portion 62 to hold the dust emitting / detecting system. It prevents the flow into the part 62. Into the partition wall 65, it is possible to input and output a light beam between the first BS 52 of the optical pickup unit 7 provided in the emission / detection system holding portion 62 and the DP 53 of the carriage 35 provided in the moving optical system holding portion 34. The through hole 66 is formed so that

As shown in FIG. 2, the through-hole 66 is formed by forming a processing hole 67 in the side wall of the emission / detection system holding portion 62 of the housing 12 and inserting a processing means therein. However, after forming the through hole 66, it is necessary to close the unnecessary processing hole 67 with a filler or a plate material to prevent dust.

Next, the second substrate 16 and the third substrate 17 will be described. The second substrate 16 constitutes a part of the circuit of the emission system and the detection system of the optical pickup unit 7, is fixed on the emission / detection system holding portion 62 of the housing 12, and is fixed to the optical pickup unit 7. It is electrically connected to each part. Further, the third substrate 17 is installed on the lower surface of the housing 12 as shown in the side views showing the relation between the third substrate and the housing in FIGS. 1 and 7.

FIG. 8 is a bottom view of the housing. As shown in FIG. 2, the housing 12 is provided with a carriage window 70 for installing the carriage 35.
Flexible cable feeding window 72 for feeding power from the outside to the flexible cable 71 of the seek unit 10 via the seek unit drive circuit connector 25 of the third substrate 17, and the motor drive circuit connector 24 portion of the third substrate 17 The spindle motor power supply window 73 and the magnetic head power supply window 74 of the magnetic head drive circuit connector 26 are formed at the bottom, and the seek unit drive circuit connector 25 is provided in the flexible cable power supply window 72 which is a through window. Housing 12
Enter from the bottom side of the
The motor drive circuit connector 24 is inserted into 73, and the magnetic head drive circuit connector 26 is inserted into the magnetic head power supply window portion 74. The windows 70, 72, 73, 74 above
Is closed by a third substrate 17 screwed to the lower surface of the housing 12 so that dust does not enter the housing 12. On the lower surface of the housing 12, a plurality of (three positions are shown in the figure) convex portions 75 are provided so as to project, and a female screw 75a is formed on each convex portion 75, and a hole portion 76 formed in the third substrate 17 is formed. After inserting the convex portion 75, the convex portion 75 is screwed as shown in FIG.

By the way, the optical pickup unit 7 has a plurality of adjustment points as described above, and the adjustment is performed in the unit of μm. It is necessary to provide a reference for the optical pickup unit 7 for this adjustment or for assembly after the adjustment. In this embodiment, the lower surface of the housing 12 serves as the reference surface of the optical pickup unit 7. That is, the three convex portions 75 of the housing 12 are used as the reference in the Z direction (FIG. 2), and the female screw 75a is formed on the convex portion 75 so that the screws can be accurately screwed.

Further, the lower surface of the housing 12 is provided with a positioning recess 7 having a plurality of through holes (two positions are shown in FIG. 8).
6 is formed, and for example, a cylindrical pin is fitted into the recessed portion 76 in a member assembled to this portion, whereby highly accurate adjustment,
Can be assembled. Since the lower surface of the housing 12 is a portion that does not relatively affect other members, the convex portions are formed at long intervals.
Since the 75 and the recessed portion 76 are provided, the accuracy of adjustment and assembly can be improved more than that with a short interval.

In particular, since the convex portion 75 is provided on the lower surface of the housing 12, it can be used as a processing reference surface for the moving optical system holding portion 34 and the emission / detection system holding portion 62. Further, since the protrusion 75 can make the assembling standard and the machining standard the same, the assembling accuracy can be further improved.

FIG. 9 is a plan view of the spindle motor unit 8 in a state where the third board 17 and the housing 12 are assembled. When the third board 17 is screwed to the housing 12,
The motor drive circuit connector 24 shown in FIG. 1 is located in the spindle motor power supply window portion 73, which is a through hole, and the socket 49 is fitted into the motor drive circuit connector 24,
It becomes possible to supply power from the outside to the rotation drive power supply pattern 47 through the wire rod 48. In this state, the wire 48 is
Since it extends in the direction perpendicular to the spindle motor rotation shaft 41a, it does not come into contact with the rotation drive unit 41.

A drive circuit C for the spindle motor unit 8 is provided on the outside of the housing 12 of the third substrate 17 so that the temperature inside the housing 12 does not rise due to the heat generated by the drive circuit C during operation. It is possible to prevent the deterioration of the characteristics of each part due to, and to suppress the generation of distortion and offset of the detection signal.

[0039]

As described above, according to the first means of the present invention, the connector of the printed circuit board is inserted into the through window of the housing, and the bottom surface of the housing is closed by the printed circuit board. In this case, the dust does not enter the housing, the dust does not adhere to the optical components in the housing and the optical characteristics are not deteriorated, and the second means causes the drive circuit of the spindle motor to generate heat. However, it does not affect the constituent members in the housing and can prevent the deterioration of various characteristics due to the temperature rise. Further, according to the third means, the wire material connecting the power feeding pattern and the connector is arranged in the rotation axis direction of the spindle motor. Since it can be prevented from coming out, contact with the rotating portion of the spindle motor such as a wire rod can be eliminated, and damage to parts and deterioration of rotation accuracy can be prevented. According, by arranging the power-feeding pattern between the spindle motor fixing screw,
The space for the pattern arrangement can be reduced, and other members can be brought close to the spindle motor, which leads to downsizing and space saving. Therefore, power supply to the spindle motor unit can be reduced, and dust can be prevented. It is possible to provide an optical information recording / reproducing apparatus that can be performed by a configuration that does not affect the rotation of the motor.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing a schematic configuration of an embodiment of an optical information recording / reproducing apparatus of the present invention.

FIG. 2 is a perspective view showing the relationship between a housing and a spindle motor unit.

FIG. 3 is a perspective view showing an optical system of an optical pickup unit.

FIG. 4 is a perspective view for explaining a fixed structure of an LD.

FIG. 5 is a perspective view of a KEP portion.

FIG. 6 is a perspective view for explaining a fixed structure of the FO-PD.

FIG. 7 is a side view showing the relationship between the third substrate and the housing.

FIG. 8 is a bottom view of the housing.

FIG. 9 is a plan view of a spindle motor unit portion in a state where a third substrate and a housing are assembled.

[Explanation of symbols]

8 ... Spindle motor unit, 12 ... Housing,
17 ... Printed circuit board, 24 ... Motor drive circuit connector,
41 ... Rotation drive part, 42 ... Circular flat part (holding substrate), 45 ... Screw, 46 ... Power supply printed circuit board, 47 ... Rotation drive part power supply pattern, 48 ... Wire, 49 ... Socket, 73 ... Spindle motor power supply window Part (through window).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Takehide Ohno 1-3-6 Nakamagome, Ota-ku, Tokyo Inside Ricoh Co., Ltd.

Claims (4)

[Claims] 1. An optical information recording / reproducing apparatus comprising a spindle motor unit for rotationally driving an optical information recording medium, a housing for supporting the spindle motor, and a power supply member for driving the spindle motor. A spindle motor driving power supply member is provided with a connector, a through-hole is formed in the housing corresponding to the connector, the printed circuit board is fixed to the bottom surface of the housing, and the connector is inserted into the through-hole. An optical information recording / reproducing apparatus in which a motor driving power supply member and a connector are connected. 2. The optical information recording / reproducing apparatus according to claim 1, wherein a drive circuit for the spindle motor unit is provided on the printed circuit board outside the housing. 3. An optical information recording / reproducing apparatus, wherein a spindle motor unit for rotatably driving an optical information recording medium is composed of a rotation driving section, a power supply printed board and a holding base. An optical system characterized in that a rotation drive unit power supply pattern connected to the connector is provided, and the rotation drive unit power supply pattern is arranged in a plane perpendicular to the rotation axis of the spindle motor and in the connector installation direction. Information recording / reproducing apparatus. 4. The optical information recording / reproducing apparatus according to claim 3, wherein the rotation drive unit power supply pattern is arranged between a plurality of screws for fixing the holding substrate to the housing.