JPH05217179A - Optical information recording and playback apparatus - Google Patents

Abstract

PURPOSE:To prevent that a flexible cable influences other members or that it is influenced by them when it is deformed. CONSTITUTION:A partition body 92 is installed in a housing 12 between the following: a seek unit 10 installed on the side part of a carriage 35; and a flexible cable 71 which is connected electrically to the drive means of the carriage 35. As a result, even when the flexible cable 71 is deformed at the movement of the carriage 35, its deformed part does not come into contact with the seek unit 10 because the partition body 92 exists.

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 pickup body (hereinafter referred to as a carriage) that holds and moves along the recording surface of the disc is provided on the frame, and a flexible printed circuit board (hereinafter referred to as a flexible printed circuit board) for supplying a drive current to a servo drive mechanism mounted on the carriage. , Flexible cable). The flexible cable has one end bent at a right angle to the fixed part on the side of the carriage and is arranged in the frame so as to bend in a U shape in the thickness direction. It is located next to the drive motor and turntable.

[0003]

In the above conventional optical information recording / reproducing apparatus, the bent portion of the flexible cable is deformed as the carriage having one end fixed is moved, and the motor and the turn are turned. There is a risk that the table or the linear motor for moving the carriage may come into contact with the linear motor, causing damage to the members or malfunction.

An object of the present invention is to provide an optical information recording / reproducing apparatus capable of preventing the flexible cable from affecting or receiving other members due to deformation.

[0005]

In order to achieve the above object, a movable carriage provided with an optical member for irradiating a recording surface of an optical information recording medium with a light beam as a light spot, and a movable carriage. In an optical information recording / reproducing apparatus provided with a housing that movably supports and a flexible cable electrically connected to a driving means provided on the carriage, the first means of the present invention is the side of the carriage. A partition is provided in the housing between the carriage driving means installed on one side and the flexible cable.

The second means is that, in the above-mentioned optical information recording / reproducing apparatus, a partition is provided in the housing between the spindle motor unit for rotating the optical information recording medium and the flexible cable. Characterize.

A third means is characterized in that, in the above-mentioned first and second means, the partition is made of a highly slippery material.

[0008]

According to the above-mentioned first means, the carriage driving means and the flexible cable, and according to the second means, the spindle motor unit and the flexible cable are installed without contact by the partition walls. The deformation of the flexible cable does not affect the carriage driving means or the spindle motor unit, and the flexible cable is not damaged.

Further, by forming the partition body with a highly slippery material, even if the flexible cable is deformed and comes into contact with the partition body, the partition body is smoothly deformed and does not affect the movement of the carriage. No more damage to the cable.

[0010]

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

FIG. 1 is an exploded perspective view showing a schematic structure of an embodiment of the present invention. The exterior part of the apparatus includes 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 substrate 15 is provided with the controller system circuit of each part, the second substrate 16 is provided with the emission system and detection system circuits of the optical pickup unit 7, and the third substrate 17 is the home position sensor 19 and light emission. Element 20, Cartridge presence / absence sensor 21, Loading switch 22, Eject switch 2
3, 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 substrate 15 is connected to the second substrate 16 (→), The second and third cables 28, 29 are connected (→, →) to the third board 17.

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 which are carriage driving means for moving the carriage 35 by electromagnetic action.
And 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. In addition, the spindle motor unit 8 has a turntable 40, a rotation drive section 41, a circular flat section 42 including a small diameter section 42a and a large diameter section 42b and having a screw insertion hole 42c formed therein.
Further, a gap 41a is provided between the turntable 40 and the rotation drive unit 41.
Are formed. On the other hand, the motor holding part of the housing 12
A hole 43 is formed in the 37 to be fitted with the lower protrusion 42d of the rotation driving unit 41, and a female screw is formed at a position corresponding to the three screw insertion holes 42c formed in the circular flat surface 42. The protruding portion 44 for positioning is provided.

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.

FIG. 3 is a perspective view showing an optical system of the optical pickup unit 7 shown in FIG. 1. A light flux B emitted from a semiconductor laser (LD) 50 is converted into parallel light by a coupling lens (CL) 51, and a first light beam is emitted. 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, and the light beam B emitted from the LD 50 is stabilized. 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 has an LD holder 60 and 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 light.
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 the TR-PD59 are arranged on the side portion 62b of the emission / detection system holding portion 62 of the housing 12 as shown in a 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 portion 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 portion 73 and the magnetic head power supply window portion 74 of the magnetic head drive circuit connector 26 are formed at the bottom. The windows 70, 72, 73, 74 are closed by a third substrate 17 screwed to the lower surface of the housing 12 to prevent dust from entering the housing 12. On the lower surface of the housing 12, a plurality of protrusions (three locations are shown in the figure) 75
Is projected, and each convex portion 75 is formed with a female screw 75a,
After inserting the protrusion 75 into the hole 76 formed in the third substrate 17, the protrusion 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).
By forming 6 and fitting a columnar pin, for example, in the concave portion 76 to a member assembled in this portion, highly accurate adjustment and assembly can be performed. Since the lower surface of the housing 12 is a portion which does not relatively affect other members, the convex portions 75 and the concave portions 76 are provided at long intervals, so that the accuracy of adjustment and assembly can be improved more than that at short intervals.

In particular, since the convex portion 75 is provided on the lower surface of the housing 12, it can be used as a reference surface for processing 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 an exploded perspective view for explaining the fixation of the flexible cable of FIG. 1. The flexible cable 71 is connected to the electromagnetic coil of the lens actuator unit 9 in addition to the power supply to the seek unit 10. Power supply and power supply to an optical member that detects movement of the objective lens L in the tracking direction are performed. Since the carriage 35 moves in the seek direction, flexibility is provided so as to minimize the load on the movement of the carriage 35. have. Therefore, the flexible cable 71 is bent into a substantially U shape in plan view.
71b.

The flexible cable 71 is a seek coil that constitutes the seek unit 10 with the side portion of the carriage 35.
A screw insertion hole 82 for coupling is formed in the lower left portion of the carriage 35 at a portion corresponding to the female screw portion 81. If the diameter of the coupling screw insertion hole 82 is set to a diameter that allows the screw 83 to be fitted, the flexible cable 71 is positioned with respect to the carriage 35. The positioning of the flexible cable 71 in the rotation direction around the screw 83 is performed by the seek coil mounting convex portion 84 located at the lower right of the carriage 35.
It is made by abutting the cutout lower side 71a of the flexible cable 71 on the upper side of a, and the bent portion of the flexible cable 71 is formed.
71b will be positioned parallel to the carriage movement direction.

An escape hole 86 is formed on the carriage side of the flexible cable 71 for escaping the contact with the bearing pin insertion land 85 formed on the carriage 35, and in the upper left portion of the flexible cable 71, Seek coil mounting protrusion 84b provided on the upper left of the carriage 35
An escape portion 71c is formed for escaping the contact with.
The bearing pin insertion land 85 is inserted with a support pin of a bearing (not shown) that supports the guide shaft 36 of the carriage 35. The bearing pin insertion land 85 improves the positional accuracy of the bearing and increases the fixing force of the bearing. It is thicker than the frame part.

Further, the soldering terminal portion 87 for electrical connection in the flexible cable 71 is arranged on the upper surface of the carriage 35, but since the lens actuator 9 is present in the carriage 35, it is necessary to reduce the size in the Y direction. Therefore, the soldering terminal portion 87 is provided in the bent portion 71f formed by bending the flexible cable 71 from the side surface of the carriage to the upper surface portion, and by being further bent, it does not float on the upper surface of the carriage 35. It is fixed with screws 88 as shown. In order to shorten the X and Y directions of the flexible cable 71 in this portion, and to stabilize the fixation, the X of the flexible cable 71 is inserted into the screw hole 89 of the flexible cable 71 into which the screw 88 is inserted.
Located approximately in the center of the direction, and a pair of seek coils
A pattern P for electrically connecting (only one seek coil 80 is shown in FIG. 9) is formed in the periphery to save space.

By the bent portion 71f formed so as to reach the upper surface portion from the side wall of the carriage 35 by the bending, the rigidity of the flexible cable 71 in this portion is increased so that the flexible cable 71 is less likely to be deformed. It is possible to prevent it from deforming into contact with and interfering with other surrounding members.

The carriage of the flexible cable 71
On the upper surface of 35, the gap of the spindle motor unit 8
By forming a side portion 71d that fits into the 41a, the carriage 35 and the spindle motor unit 8 are brought close to each other so that the carriage 35 can be moved further deeper toward the inner peripheral side of the disk, and the flexible cable 71 is present. However, space saving and downsizing of the entire device can be achieved. Further, in order to improve the adhesion between the flexible cable 71 and the carriage 35, plate members 90 and 91 for lining are provided on the side surface of the carriage and the back surface of the upper surface portion of the flexible cable 71.

When the above-mentioned assembling of the flexible cable 71 is completed, the end portion 71e bent in a U-shape becomes the flexible cable power supply window portion 7
The carriage drive circuit connector 25 located in the second housing 12 is fitted from above.

By the way, the carriage 35 is in the seek direction.
When moved in the (X direction), as shown in the explanatory view of FIG. 10, the bent portion 71b of the flexible cable 71 and the end portion 71e bent in a U shape are deformed, and sometimes the seek unit near the flexible cable 71. 10 or the spindle motor unit 8 may come into contact. Therefore, in this embodiment, as shown in FIG. 9, the first partition body 92 and the second partition body 93 are provided between the spindle motor unit 8 and the seek unit 10 and the flexible cable 71, respectively. There is.

The first and second partition walls 92, 93 are made of L-shaped sheet metal, and have small holes 92a, 93a and large holes on the bottom side, respectively.
92b and 93b are bored, and large holes 92b and 93b are installed in the land portion 94 with the female screw projectingly provided on the housing 12, and small holes 92a and 93a are installed in the positioning pin 95, respectively. Then, it is fixed to the housing 12 by the screw 96. Even if the flexible cable 71 is deformed by the movement of the carriage 35 due to the first and second partition bodies 92 and 93, the flexible cable 71 does not come into contact with the spindle motor unit 8 or the seek unit 10, so that malfunctions or damage to parts may occur. Can be prevented.

FIG. 11 is a perspective view showing another example of the partition wall body. In the example shown in FIG. 11, the first partition wall body 92 and the second partition wall body 93 described above are used.
The portions 92 'and 93' corresponding to and are formed as an integral partition wall body 97 whose bottom side portion is continuous, so that the configuration is simplified and the cost is reduced.

In the partition walls 92, 93, 97, a burring surface S (FIG. 11), which is a side where burrs are formed when a sheet metal is punched and formed, is arranged on the spindle motor unit 8 and seek unit 10 sides. By flexible cable 71
Can be prevented from being damaged by burrs.

Further, by forming the partition walls 92, 93, 97 with a highly slippery material such as plastic, the flexible cable 71 is deformed when the carriage moves, and the partition walls 92, 93, 97 are formed.
Even if it touches, the deformed part will slide smoothly on the wall surface.
It is possible to prevent the occurrence of damage in the deformed portion, and further, the movement of the carriage 35 is not hindered.

[0044]

As described above, according to the first and second means of the present invention, the deformation of the flexible cable can be prevented from coming into contact with the carriage driving means or the spindle motor unit by the partition body. Prevents malfunctions and component damage caused by the contact, durability,
The reliability is improved, and the partition body is made of a highly slippery material, so that even if the deformed portion of the flexible cable comes into contact with the partition body, the contact portion slides smoothly, so that the flexible cable is not damaged. Since it does not hinder the movement of the carriage and the flexible cable is deformed, it may affect other members,
It is possible to provide an optical information recording / reproducing device that can prevent the receiving of information.

[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 an exploded perspective view for explaining fixing of a flexible cable.

FIG. 10 is an explanatory diagram of a modification of the flexible cable.

FIG. 11 is a perspective view showing another example of the partition body.

[Explanation of symbols]

8 ... Spindle motor unit, 10 ... Seek unit
(Carriage driving means), 12 ... Housing, 35 ... Carriage, 71 ... Flexible cable, 71b ... Bent portion,
71e ... end, 71f ... bend, 80 ... seek coil,
92, 93, 97 ... Partition body.

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

Claims (3)

[Claims] 1. A movable carriage provided with an optical member for irradiating a light flux as a light spot on a recording surface of an optical information recording medium, a housing for movably supporting the carriage, and a carriage provided on the carriage. In an optical information recording / reproducing apparatus provided with a flexible cable electrically connected to a driving means, a partition body is provided in the housing between the carriage driving means and the flexible cable installed on a side of the carriage. An optical information recording / reproducing apparatus characterized by being provided with. 2. A movable carriage provided with an optical member for irradiating a light flux as a light spot on a recording surface of an optical information recording medium, a housing for movably supporting the carriage, and a carriage provided on the carriage. In an optical information recording / reproducing apparatus including a flexible cable electrically connected to a driving means, the housing between the spindle motor unit for rotating the optical information recording medium and the flexible cable. An optical information recording / reproducing apparatus characterized in that a partition wall is provided on the inner surface. 3. The optical information recording / reproducing apparatus according to claim 1, wherein the partition is made of a highly slippery material.