JPH04184773A - Fpc fixation structure to carriage of information recording device - Google Patents

Abstract

PURPOSE:To enable an information recording device to be compact, light, and speeded up by constituting it with a coil for driving a carriage and an FPC for supplying current to the coil, fixing the FPC to an end face of the coil, and then making the end face of the coil to be a guide surface of the FPC. CONSTITUTION:For speeding up seek operation of an information recording device, a laser diode 17 for reducing a mounting means to a carriage 5 extremely, a prism for emitting laser beam 18 etc. are fixed to a main chassis 1 and are separated from a movable part. Namely, an actuator 12 consisting of a minimum required flap mirror 16, a parallel plate spring structure, and an objective lens 15 is mounted to the carriage 5 which is a movable pat. In this manner, the weight of the carriage 5 is reduced, a VCM coil for driving the carriage 5 is fixed at both sides, an FPC 11 is fixed on one end face of the coil,d or the end face is set to a guide surface of the FPC 11, thus enabling the carriage 5 to be compact owing to reduction in weight of the movable part and an information recording device to be speeded up.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application 1] The present invention relates to a structure for fixing an FPC to a carriage of a so-called information recording device such as an ODD, HDD, or FDD.

[Summary of the Invention] The present invention provides an FP for supplying current to a coil for driving a carriage, which is one component of the information recording device.
With regard to the fixing of C and the guiding means, it is desirable to reduce the running resistance of the FPC and reduce fluctuations in running resistance during the seek operation of the carriage, and to reduce the weight of movable parts including the carriage so as to move the carriage. The high-speed seek operation contributes to reducing the weight of the movable part and serves as a means of increasing the speed of the information recording device.

[Prior Art] A conventional structure will be explained. FIG. 5 is an assembled plan view of an information recording device with a conventional structure. FIG. 6 is an assembly side sectional view seen from the right end side of FIG. 5.

In the figure, 1 is the main chassis of the information recording device, 2 is a hazel, which is fixed to a mount frame 3, which is a fixing means for the information recording device, and a cartridge (in the figure) in which a disk 30, which is an information recording medium, is housed. (not shown) has a window into which it is inserted. Reference numeral 4 denotes a spindle motor for driving the disk 30, which is fixed to the main chassis 1. Reference numeral 65 denotes a carriage, which is guided by rails 9, 9 and is capable of seek operation in the radial direction of the disk 30. For example, in the case of ODD, a laser diode 17 as an optical element, an objective lens 15 for narrowing down the beam from the laser diode 17 and focusing it on the recording surface of the disk 30, and for focus control,
A lens actuator 12 and the like comprising a parallel plate spring structure for vertically moving the objective lens 15 are mounted. 6 is an outer yoke which is a component of a linear motor (VCM) for driving the carriage 5 in the radial direction of the disk 30, 7 is an inner yoke which is also a component of the VCM, and 19 is the outer yoke 6.
A permanent magnet is fixed to the inner surface of the outer yoke 6 and has magnetic poles in the thickness direction of the outer yoke 6. Reference numeral 8 denotes a coil, which is a component of the VCM, fixed to one end surface of the carriage 5 via an H-shaped holder (shown in FIG. 5). 10 is a presser spring for fixing the rail 9.9 to the main chassis;
Reference numeral 1 denotes an FPC fixed to one end surface of the carriage 5, which has a semi-circular arc shape approximately in the middle, and one end of the semi-circular arc shape is extended and a reinforcing plate 31 is fixed to it. It is fixed to the carriage 5. The other end of the semi-circular arc is extended and screwed to the portion 1a of the main chassis 1 via a reinforcing plate 32.

The operation will be explained.

The cartridge is inserted through the window of the bezel 2 and the disk 30 is clamped to the spindle motor 4. Thereafter, the spindle motor 4 rotates, and the disk 30 rotates. In response to a command from a controller (not shown) of the information recording device, the laser diode 17 is turned on, a laser beam is emitted, the optical path is changed by the flip-up mirror 16, and the beam enters the objective lens 15.Parallel beam is the objective lens 15
The light is focused on the recording surface of the disk 30. On the other hand, q is connected to the coil 8 of the VCM via FPCll.
4 streams are supplied, and the carriage 5 is connected to the disk 30.
A seek operation is performed in the radial direction of 0NI-rack on the required track, and information on the track is read or information is written on the track.

[Problem to be Solved by the Invention] The structure for fixing the FPC to the carriage 5 of the information recording device according to the above-described conventional structure is such that the FPC is fixed directly to the -(011 side of the carriage 5 or via the reinforcing plate 31 of the FPC. When directly fixing and guiding the FPC to the carriage 5, the center of the semicircular arc of the FPC should be placed within the width of the guide part of the FPC on one side of the carriage 5 over the entire seek operation range. This is because if the center of the arc deviates from the width of the guide section, the semicircular arc shape of the FPC will be distorted and a pulling or pressing force will be applied to the FPCI 1. The force acts on the carriage 5. In this case, the force causes the running resistance of the carriage 5 to change depending on the location, which affects the positioning performance of the carriage 5 by the servo. Focused on the surface,
In order to precisely turn on the track, the position of the carriage 5 is controlled by applying a servo.
When the running resistance fluctuates, this servo control is disturbed, and it takes time to reach the 0NI-rack, or it becomes impossible to turn on the track. Therefore, the FPC of the carriage 5
When the length of the guide surface of I1 is set to be long, the carriage 5 becomes larger and the weight of the carriage 5 increases, which again has the disadvantage that the seek operation of the carriage becomes slow. Furthermore, as shown in FIG. 5, if the fixed portion of the FPC of the carriage is made short in order to reduce the weight of the carriage 5, the guide surface of the FPC II is no longer provided on the end surface of the carriage 5. There was also a structure in which the reinforcing plate 31 of the FPCII was installed on one end surface of the carriage 5, but since the reinforcing plate was also made of glass-containing epoxy resin, the weight became non-negligible. In addition, these guide surfaces are located on one side of the diagnostic carriage 5.
However, as the speed of the information recording device increased, it became necessary to utilize this space as another VCM coil space, and the movable part In order to reduce the weight of the carriage 5, it is necessary to make the carriage 5 smaller.
It was necessary to develop a guiding and fixing structure for FPC that would not increase weight. The present invention aims to improve these drawbacks, and contributes to miniaturization, reduction in weight, and increase in speed of information recording devices.

[Means for Solving the Problems] The structure of the present invention includes: 1) an information recording medium, a flip-up mirror having the function of irradiating the information recording medium with a beam, a carriage for fixing the flip-up mirror, and the carriage. A carriage drive coil fixed to both sides of the fill, and an FPC for supplying current to the fill.The FPC is fixed to the end face of the coil, and the end face of the coil is
It should be used as a guide for C.

2) The approximate middle part of the FPC has a semicircular arc shape, and one end of the semicircular arc is guided by the guide part of the coil, and the other end is parallel to the guide part of the coil. The semicircular arc is guided by a fixed guide means, and the center of the semicircular arc is located within the width of both the guide means and is held in the entire movable range of the information recording medium in the radial direction of the carriage. A structure for fixing an FPC to a carriage of an information recording device according to claim 12.

3) A structure for fixing an FPC to a carriage of an information recording apparatus according to claim 1, wherein a guide plate of the FPC is interposed between the FPC and the guide surface.

4) A structure for fixing an FPC to a carriage of an information recording device according to any one of claims 1 to 3, characterized in that the FPC is adhesively fixed to one end of the coil.

5) A bending part is formed outside the width of the guide part of the coil on the fixed end side of the FPC to the coil. PC fixed structure.

It is characterized by

[Function 1] The present invention has the above structure and functions as follows. In order to speed up the seek operation of the information recording device, the carriage 5
In order to make the mounting means as light as possible, the laser diode 17, the prism 18 for laser beam irradiation, etc. were fixed to the main chassis I and separated from the movable parts. In this way, the carriage 5, which is a movable part, has the minimum necessary flip-up mirror 16. Parallel plate spring structure and objective lens 1
It is equipped with 12 actuators consisting of 5 actuators.

In this way, the weight of the carriage 5 was reduced, and VCM coils for driving the carriage 5 were fixed to both sides thereof. Then, the FPC is fixed to one end surface of the coil, and the end surface is used as a guide surface for the FPC [Example] An example of the present invention is shown in FIGS. 1, 2, 3, and 3. This will be explained in detail with reference to FIG.

In the figure, reference numeral 1 denotes a main chassis, which is a fixing means for fixing a fixed head 14 on which the fixed optical element is mounted, a spindle motor 4, a rail 9.9, and various components of the VCM to be described later. A bezel 2 is fixed to a mount frame 3, which is a fixing means for the information recording device, and has a window for inserting the cartridge (not shown). A spindle motor 4 has the function of clamping and rotating the disk 30, which is an information recording medium housed in the cartridge. A carriage 5 is guided by the rail 9.9 via a pole bearing. The carriage 5 includes
As mentioned above, the flip-up mirror 16 and the actuator 12 are fixed. Reference numeral 6 denotes an Araku yoke that is a component of a linear motor (VCM) for driving the carriage 5, 7 an inner yoke that is also a component of the VCM, and 8 a coil of the VCM fixed on both sides of the carriage 5. Reference numeral 11 denotes an FPC for connecting current to the coil 8 and the coil (not shown) of the actuator 12, and the substantially central portion thereof has a semicircular arc shape, and one end of the semicircular arc shape is used to drive the VCM. The other end is connected to the left end side 11b of the coil 8 as shown in FIG.
After being bent into a circular shape and folded back, a portion is fixed with adhesive near the left end of the coil 8, and
, carriage 5. It is developed along the lower surface of the coil 8 and is adhesively fixed to the back surface of the coil 8. On the back side of the second FPC, the coils 8 and 8 are connected to the actuator to be described later.
Each coil wire of the coil of the motor 12 is soldered. 13 is a yoke that is a component of the actuator 12 and has a permanent 6R stone (shown in FIG. 2); 15 is for focusing the laser beam from the laser diode 17 onto the recording surface of the disk 30; The objective lens is fixed to the parallel plate spring structure, and the coil of the actuator 12, the permanent magnet, and the yoke 13 are fixed to the parallel plate spring structure.
It moves in the thickness direction of the disk 30 due to the action of
Servo control is performed to focus the light onto the recording surface of the disk 30. 16 is an irradiation prism 18 and the objective lens 15
The irradiation prism 18 is arranged with a flip-up mirror located between the
It has the function of changing the optical path of the beam struck by 90 degrees and making it enter the objective lens 15. 19 is a permanent magnet of the VCM, 20 is a circuit board for driving the VCM, and is located on the front 12F.
One end of PC is connected.

The operation will be explained.

The cartridge is inserted into the information recording device, and the disk 30 is clamped to the spindle motor 4 and rotated. Thereafter, the laser diode 17 is turned on by a command from the controller of the information recording device. The beam from the laser diode 17 is changed in optical path by the irradiation prism 18 and directed toward the flip-up mirror 16 . The optical path is further changed by the flip-up mirror 16 and the beam passes through the objective lens 15.

Then, as described above, the light is focused on the recording surface of the disk 30. Under the control of the control information on the disk 30 and the controller of the information recording device, the carriage 5 performs a seek operation in the radial direction of the disk 30, racks a required track, reads information, or Write information. The seek operation is servo-controlled and very precisely controlled. The carriage 5
During the seek operation, when the carriage 5 is at the position shown by the solid line in FIG. When the seek operation is performed to the position 5a of the image line, the FPCII comes into contact with one end 8b (shown in FIG. 2) of the coil 8 at the lower end of the semicircular arc, and the guided straight part is moved away from the guide part. The coils are separated to form a semicircular arc at the lla position, and at this time, the center of the semicircle is located inside the left end of the coil 8. In this way, even if the carriage 5 performs a seek operation in the radial direction of the disk 30, the center of the semicircular arc portion is located within the width of the coil 8, that is, the width of the guide portion of the PFC throughout the entire stroke. Further, the other guide part 1a of the FPC is provided in the main chassis l in parallel with the guide part of the FPC of the coil 8, and as shown in FIG. Even during operation, the center of the semicircular arc portion does not come off the guide portion 1a.

[Effects of the Invention] As configured as described above, the present invention has the following effects.

In the present invention, in order to operate the information recording device at high speed, the weight of movable parts such as the gear 9 and f 95 is reduced, the number of required documents to be mounted on the carriage 5 is minimized, and it is installed separately from the fixed head 14. I decided to do so. Further, VCM coils 8.8 were installed at both ends of the carriage 5 for the purpose of increasing the driving force of the carriage. Then, the FPCII for supplying current to the coil 8.8 is adhesively fixed to one end surface 8b of the coil 8, and the FPCII is always connected to the end surface 8b.
The guiding portion is configured such that the center of the semicircular arc is located on the end face, and the structure guides the FPC so that it is bent in the same shape without the aforementioned distortion throughout the entire stroke of the carriage 5. .

Further, a fixed full guide surface 1a is installed on the main chassis 1, which is a fixed object, parallel to the guide surface of the coil 8, and the semicircular arc portion is guided in the same manner as described above. In this way, the semicircular arc portion of the FPC is sandwiched between two parallel guide surfaces and is always guided in the same shape with the same radius, resulting in uniform running resistance over the entire stroke, which is extremely advantageous in terms of servo performance. becomes. Also,
When the one end surface 8b of the coil 8 is configured as one guide surface of the FPC II, it is optimal for reducing the weight of the movable part because a dedicated member for guiding on the movable part is not required. Since it is a lightweight material, it is directly connected to the coil 8.
It can be fixed by adhesive, and by doing so, the fixing means can be configured with a minimum weight.

Further, as shown in FIG. 1, one end of the semicircular arc portion of the FPCII on the coil side is expanded to the left along the coil 8, bent at the outside llb of the left end of the coil 8, and then bent to the right. Since the structure is such that the coil 8 is folded back and unfolded and the part is bonded to a part of the guide surface 8b of the coil 8, the bulge due to the elasticity of the FPCII of the bent part 11b can be removed to the outside of the guide part 8b. By doing this, the deformed portion of the bent portion 11b is connected to the FPC 1.
1, and it is possible to make the shape of the aforementioned FPC 1l uniform over the entire stroke of the carriage 5, which also reduces the running resistance and improves the durability of the FPC. This will greatly contribute to the Although one embodiment of the present invention has been described in detail, the present invention can be applied as follows. A structure in which the FPC II is not directly adhesively fixed to one end 8b of the coil 8, but a reinforcing plate as seen in the conventional example is fixed to the FPC, and the reinforcing plate is fixed to the end face of the coil 8 by adhesive or the like. . Since the FPC is adhesively fixed to the coil (a structure in which a thin plate spring is installed on the carriage 5 or the coil 8 and the FPC is held between the thin plate springs), even if configured in this way, there is no problem. It is possible to obtain the same functions and effects as the present invention without departing from the gist of the present invention.Furthermore, although ODD has been described in detail as an example of the present invention, it is not limited to this. The aforementioned HDD, F
It is applicable to information recording devices of any structure, such as DDs.

[Brief explanation of the drawing]

FIG. 1 is an assembled plan view of an information recording device showing an embodiment of the present invention. FIG. 2 is an assembly side sectional view seen from the right end side of FIG. 1. FIG. 3 is an assembled side sectional view seen from the front side of FIG. 1, and FIG. 4 is an enlarged view of the main parts of FIG. FIG. 5 is an assembled plan view of an information recording device showing a conventional example, and FIG.
The figure is an assembly side sectional view seen from the right end side of FIG. 1... Main chassis 2... Bezel 3... Mount frame 4... Spindle motor 5... Carriage 6... Outer yoke of VCM 7... Inner yoke of VCM 8... VCM Coil 9...Rail 11...FPC 12...Actuator 14...Fixed head 15...Objective lens 16...Flip-up mirror 17...Laser diode 19...V'CM permanent Magnet 30... Disk 31... Reinforcement plate 32... Reinforcement plate and above Applicant Seiko Epson Co., Ltd. Agent Patent attorney Kizobe Suzuki (1 other person) Figure 2 Figure 4 Figure 6

Claims (1)

[Claims] 1) An information recording medium, a flip-up mirror that functions to irradiate a beam onto the information recording medium, a carriage for fixing the flip-up mirror, and a carriage drive fixed to both sides of the carriage. The FPC is fixed to the end face of the coil, and the end face of the coil is connected to the FP.
A structure for fixing an FPC to a carriage of an information recording device, characterized in that the FPC is used as a guide surface of a C. 2) The approximate middle part of the FPC has a semicircular arc shape, and one end of the semicircular arc is guided by the guide part of the coil, and the other end is parallel to the guide part of the coil. The semicircular arc is guided by a fixed guide means, and the center of the semicircular arc is located within the width of both the guide means and is held in the entire movable range of the information recording medium in the radial direction of the carriage. A structure for fixing an FPC to a carriage of an information recording device according to claim 1. 3) A structure for fixing an FPC to a carriage of an information recording device according to claim 1, wherein a guide plate for the FPC is interposed between the FPC and the guide surface. 4) A structure for fixing an FPC to a carriage of an information recording device according to any one of claims 1 to 3, characterized in that the FPC is adhesively fixed to one end of the coil. 5) The FPC to the carriage of the information recording apparatus according to any one of claims 1 to 4, characterized in that a bent portion is formed outside the width of the guide portion of the coil on the fixed end side of the FPC to the coil. Fixed structure.