JPH02134792A - Recording/playback device - Google Patents

Abstract

PURPOSE:To make the title device light in weight by providing a means not giving any deformation or distortion to a frame and making the thermal expansion coefficient of the frame approximately equal to that of a recording medium. CONSTITUTION:A frame 1 is provided with a spindle motor 4 chucking a recording disk medium and driven, a carriage 6 with a head 5 mounted thereon, accessed freely and guided freely in the radial direction of the recording medium and a carriage drive step motor 7. Then sub-frames 2, 3 are arranged on both side faces opposite to each other in the frame 1 so as not to cause deformation or distortion. Moreover, the frame 1 is made of a plastic member in which glass and carbon fibers are mixed and packed and the frame 1 has a thermal expansion coefficient 12.10<-6>/ deg.C - 35.10<-6>/ deg.C approximately equal to the thermal expansion coefficient of the recording medium.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a mechanical structure of a recording/reproducing device.
More specifically, the present invention relates to the frame structure of a recording/reproducing device.

[Prior art] A typical example of a conventional recording/reproducing device is the
A structure as shown in the publication No. 387 is known, and more details are shown in FIGS. 10 and 11.

FIG. 10 is a rear perspective view of a first example of a conventional recording/reproducing device;
FIG. 11 is a perspective view of a second example of a conventional recording/reproducing apparatus.

In the first example shown in FIG. 10, a frame 22 equipped with an elemental function of recording and reproducing is combined with a case 23 that covers the elemental function to form a recording and reproducing device main body 21, which includes, for example, a recording and reproducing device. The plate 24, which has a hole 24a, can be freely deformed in the X-X direction, the Y-Y direction, and the R direction in the figure. In this structure, the support pieces 24b are fixed to both sides of the bottom of the frame 22, which is made of die-cast aluminum or the like.

In the conventional recording and reproducing device of the first example with the above configuration, when the device is fixed to a base (not shown) of a system device including the recording and reproducing device, for example, the mounting configured on the base of the device is made through a hole. (Not shown) Even if there is a relative deviation in the position of the hole 24a or the planar orientation, the mounting plate 24 will not be deformed and the recording/reproducing device main body 21 will not be distorted. However, the above structure is originally based on the idea that the mounting plate 24 is deformed to prevent distortion of the recording/reproducing device main body 21. The plate 24 is constructed with low rigidity, and although it achieves its purpose, due to the low rigidity of the plate 24, the installation often causes deformation due to drops, severe vibrations, shocks, etc. The position of 21 may be incorrect, or the installation may be done on board 24.
Due to the resonance of the system formed by the recording and reproducing device main body 21, recording and reproducing F! This also has disadvantages in that the A function may be impaired, and the weight of the recording and reproducing apparatus increases in order to make the frame 22 have a predetermined XI property.

On the other hand, in the second example of FIG. 11, a recording/reproducing device main body 300 having an internal recording/reproducing function is fixed to a base (not shown) of a system device or the like including the recording/reproducing device, for example. Hole 30a for multiple installations
is formed.

In the conventional recording/reproducing apparatus of the second example with the above configuration, contrary to the first example, the recording/reproducing apparatus main body 30 is made of, for example, aluminum die-casting and is constructed to have high rigidity, so that it cannot be easily damaged by falling or severe vibration. , while eliminating the drawbacks that the position of the recording/reproducing device main body 30 may be misaligned even if it encounters a disturbance such as a shock, or that the system formed by the recording/reproducing device main body 30 resonates, When fixing to a base (not shown) of a system device, etc., consisting of a hole 30a (not shown) and a mounting hole (not shown), If the deviation occurs, the base of the device (not shown) and the recording/playback device main body 30 repel each other, causing distortion in the recording/playback device main body 30, causing a deviation in the recording/playback function provided inside, causing its function to become distorted. may be damaged, or the recording/playback device main body 30 may be damaged.
It also has the disadvantage that the weight of the recording/reproducing device increases in order to achieve a predetermined rigidity.

[Problems to be Solved by the Invention] As described above, in the conventional technology, the fixing structure for fixing the recording/reproducing device to the base of a system device including the recording/reproducing device is configured with a low-rigidity structure. If the recording/playback device is installed in a fixed position, the position of the recording/playback device may become misaligned when it encounters a disturbance such as a fall, severe vibration, or shock, or the recording/playback device may become unstable due to resonance of the system formed by the fixed structure and the recording/playback device main body 21. m ability is damaged.

On the other hand, if the fixing structure is made of a highly rigid structure and installed, it may rebound against the base of the system device, etc., causing distortion in the main body of the recording/playback device and disrupting the internal recording/playback function. It had the contradictory drawback of causing damage to its function.

In addition, both configurations have the disadvantage that the weight of the recording/reproducing device increases because the main body portion such as the frame has a predetermined rigidity.

On the other hand, in recent years, for example, among system devices that include recording/playback devices, word processors, laptop computers, etc. have become more portable, and the market needs lighter weight recording/playback devices. The demand for new devices has increased.

Accordingly, the present invention is intended to solve the above-mentioned contradictory problems and to meet the increasing market need for a ``more lightweight recording/reproducing device''.

[Means for Solving the Problems] The recording and reproducing apparatus of the present invention is equipped with: A1 rotational drive means for rotationally driving a disc-shaped recording medium; and B. signal conversion means for transmitting and receiving signals at least to the recording medium. a frame equipped with a recording and reproducing function comprising a carriage means that can freely access the recording medium in the radial direction; and an access drive means for accessing the carriage means; and means that does not cause deformation or distortion to the frame. , the frame is made of a plastic material and has a coefficient of thermal expansion approximately similar to a coefficient of thermal expansion of the recording medium.

2) The temperature expansion coefficient is l 2 * l 0-67'
It is characterized by being comprised in the range of C~35*10-6/℃.

[Function] According to the above configuration of the present invention, the frame made of a plastic material and equipped with a recording/reproducing function includes means that will not be deformed or distorted from the outside even if it encounters a temperature change. Expansion and contraction approximately approximates the expansion and contraction of the recording medium, and with respect to the standardized recording and reproducing track position of the recording medium,
The relative position of the signal converting means for transmitting and receiving signals to and from the recording medium is controlled to approximately approximate positions.

In addition, a frame made of plastic material and equipped with a recording/playback function is inexpensive and easy to mass produce.
To facilitate weight reduction of a recording/reproducing device.

[Embodiment] FIGS. 1 to 5 show the most suitable embodiment of the recording and reproducing apparatus of the present invention, and FIGS. 6 and 7 show examples of its application,
FIG. 8 shows another example of application.

FIG. 9 shows the main part of FIG. 1.

Fig. 1 is an exploded perspective view of the recording/reproducing device, and Fig. 2 is a detailed view of the main parts of Fig. 1, including a step motor fixing structure diagram and a third
Figure 2 is a front view of the step motor fixed, Figure 4 is a diagram explaining the main parts of Figure 2, and Figure 5 is a diagram explaining the guide of the step motor, and Figure 5 is the main part of Figure 4. It is a diagram showing a partial cross section and a guide structure diagram of a step motor.

FIG. 9 is an explanatory diagram illustrating the main part of FIG. 1.

In FIG. 1, a frame 1 for mounting elemental functions of recording and reproduction includes a main shaft motor 4 as a rotational drive means for chucking and rotationally driving a disk-shaped recording medium (not shown). A carriage 6 is mounted with a spatula 5 serving as a signal conversion means for transmitting and receiving signals to and from the recording medium, and is movably guided in the radial direction of the recording medium (113 not shown) and is accessible.The carriage 6 is driven for access. A step motor 7 is attached, and the main shaft motor 4 is fixed with a screw 10.

On both sides of the frame 1, a pair of sub-frames 2 are provided so as to form two opposite sides facing outside of the frame 1.
and sub-frames 3 are arranged on opposite sides of the frame 1, and the sub-frames 2 and 3 are fixed to a base (not shown) of a system device including a recording/reproducing device, for example. As a fixing structure, a plurality of fixing screws 2a and 3a are respectively formed on the outwardly opposing surfaces of the frame 1, and the surfaces are substantially perpendicular to the outwardly opposing surfaces of the frame 1. , a plurality of fixing screws 2b3b are similarly configured on this surface.

The sub-frame 2 and the sub-frame 3 are connected by screws 9a and 9, respectively, toward the substantially planar center of gravity of the frame 1 equipped with the above-mentioned recording/reproducing element functions, and the frame 1 is pivoted. are doing.

Note that the sub-frame 2 and the sub-frame 3 have elasticity in opposite directions or opposite directions toward the outside of the frame 1 described above, and have a structure that can be elastically displaced.
The structure is highly rigid in a direction substantially orthogonal to the opposite direction or the opposing direction, that is, in the direction in which the plurality of fixing screws 3b are tightened, and hardly undergoes elastic deformation.

Then, with the above structure, subframe 2 and subframe 3
The frame 1, which is pivotally attached to the frame 1, has some elasticity, and can be slightly twisted in the circumferential direction around the screws 9a and the screws 9 at the portions connected by the screws 9a and the screws 9. It is a structure.

On the other hand, a protrusion 1a for engaging with the subframe 2 is provided at a position apart from the part where the frame 1 is connected to the subframe 2 by the screw 9a (not the subframe 2 but the subframe 3). On the other hand, the sub-frame 2 is provided with an engagement hole 2C for engagement with the protrusion 1a with a required clearance, and the two are provided with a predetermined clearance without touching each other. is maintained and engaged.

The subframe 2, which is connected to the frame 1 by one screw 9a, can move slightly in the circumferential direction around the screw 9a when external stress is applied, and the coupling friction due to the screw 9a and the external stress are Due to this relative fitting effect in the circumferential direction, the position i in the circumferential direction relative to the frame l on which the recording/reproducing element function is installed is determined by the engagement hole of the sub-frame 2. 2C and frame 1
It is adaptable within the required clearance defined by the protrusion 1a.

The other sub-frame 3 engages with a boss 1m formed near the screw hole of the screw 9 of the frame 1, and is fixed at a predetermined position relative to the frame 1. .

In addition, in FIG. 1, screws have been cited as the means for connecting the sub-frames 2 and 3 to the frame 1, but the same function can be achieved by means of connecting means such as welding or caulking. Needless to say.

In contrast to the state in which subframe 2 and subframe 3 are pivotally connected to frame 1 as described above, the inner side is the subframe 2.
A case 8, which has the same dimensions on the outside of the sub-frame 3 and is formed into a substantially rectangular tube shape, is inserted and assembled from the direction of the rear arrow 11 in the figure, and the case 8 covers and protects the above-mentioned recording and reproducing element functions. Uke has a role.

Incidentally, the case 8 has a plurality of fixing screws 2a formed on the sub-frame 2 and the sub-frame 3 described above.

3a and the plurality of fixing screws 2b, 3b, the plurality of fixing screws 2a of the sub-frame 2 and the sub-frame 3 are passed through the insertion openings 8a,
3a and a plurality of fixing screws 2b.

For example, when fixing to a base (not shown) of a system device including a recording/reproducing device, the case 8 has a structure that can be tightened with screws from the base side. It has a structure that is in pressure contact with the subframe 2 and the subframe 3.

In addition, to describe in detail the case 8, which is formed into a substantially rectangular tube shape and whose inside has approximately the same dimensions as the outside of the subframes 2 and 3, the case 8 is made of a single plate-like member, and its It is formed by bending it from both sides into a roughly rectangular tube shape.
In the part where both ends coincide, a plurality of convex portions 8b and convex portions 8C with larger apexes are provided at each end as shown in Figure @1,
The concave portion formed between the convex portions 8b and the convex portion 8C are formed so as to coincide with each other, and are connected by a so-called fastener that engages with both from the thickness direction and does not separate from the surface direction. There are no gaps in the parts.

On the other hand, if the plate-like member becomes thinner using the above-mentioned connecting means, the fastener connecting portion may separate in the thickness direction, so this gl! It is necessary to provide a means to prevent it from falling off.

As the separation prevention means, the fastener connecting portion may be press-fitted, or the engaging portion may be caulked with a press machine etc. after both the protrusions 8b and 8c are engaged, but in actual practice. In 7 [, the fastener joint portion is taped with tape 8d so that it does not shift in the thickness direction to constitute a detachment prevention means.

The recording/reproducing apparatus of this embodiment having the above configuration may be used as a base (for example, a system device including the recording/reproducing apparatus)
(not shown), 1) (When fixing from both sides in the lateral direction) The sub-frame 2 and sub-frame 3, which are pivoted from both sides of the frame 1 described above, are a system including, for example, a recording and reproducing device. Base of equipment, etc. (not shown)
Even if there is a relative misalignment on the surface facing the frame 1, when a number of fixing screws 2a and 3a are tightened, each of them will face outward of the frame 1 in opposite directions or opposite directions, as described above. The frame 1 is elastically deformed to prevent distortion from occurring in the frame 1.

2) When fixing from the bottom side> The sub-frame 2 and the sub-frame 3, to which the frame 1 is pivotally attached from both sides, have a plurality of fixing screws 2b, 3b as described above.
The frame 1 has a structure that is highly rigid in the screw tightening direction and hardly undergoes elastic deformation, but as mentioned above, the frame 1 has some elasticity, and the subframe 2 and the subframe 3 and the screw 9a and the screw The plurality of fixing screws 2b are capable of twisting at the portions connected by 9, and are relatively misaligned when facing the base (not shown) of a system device including, for example, a recording/reproducing device. ,3
Even if screws b are tightened individually, the frame 1 is engaged with the part connected to the sub-frame 2 by the screw 9a and the boss 1m formed near the screw hole of the screw 9, and the relative predetermined positioning is maintained. Only a small amount of distortion was observed at the part where the subframe 3 was joined with the screw 9.
Distortion is suppressed in areas where recording and playback element functions are installed.

In this embodiment, slits lr are provided near the screw holes of the screws 9 and 9a so that local distortions of the frame 1 do not affect the entire frame.

On the other hand, as described above, the sub-frame 2, which is connected to the frame l by one screw 9a, is configured so that when external stress is applied, a relative conforming action occurs in the circumferential direction around the screw 9a. For example, there is a relative misalignment of the surface facing the base (not shown) of a system device that includes a recording/reproducing device, and a plurality of fixing screws 2
Even if screws b and 3b are tightened, the occurrence of distortion in the frame 1 equipped with the recording and reproducing element functions is further suppressed.

Of course, even if the subframe 2 connected to the frame 1 by one screw 9a receives external stress, considering the relative conforming effect that occurs in the circumferential direction around the screw 9a, The need for the other sub-frame 3 to perform the above-mentioned relative conforming effect has diminished; for example, in order to position the sub-frame 3 on the above-mentioned frame l, the boss 1m formed near the screw hole of the screw 9,
It can be placed at a position away from the screw hole of the screw 9 (not shown), or it can be positioned at a plurality of positions by providing a second boss 1n as shown by the 2 points 1' 1 line in FIG. For example, it may be firmly connected with multiple screws, etc., and at least a pair of sub-frames 2 and →
Any one of the subframes 3 may have a structure that achieves the relative conforming effect that occurs in the circumferential direction around the screw described above. As mentioned above, in both cases where it is fixed from both sides in the lateral direction and when it is fixed from the bottom side, the frame equipped with the elemental functions of recording and reproducing. 1 is pivotally attached to subframe 2 and subframe 3 in a so-called floating state, and the occurrence of distortion in the main parts is suppressed.

Next, a situation in which the recording/reproducing apparatus of this embodiment encounters a disturbance such as a fall, severe vibration, or shock will be described.

As mentioned above, frame 1 is equipped with the recording and playback element functions.
are pivotally attached to the subframes 2 and 3 in a so-called floating state, and have a plurality of fixing screws 2a,
3a or a plurality of fixing screws 2b and 3b, it is not essentially in a fixed state, in other words, it is in a floating state, and (in terms of numbers), for example, if it is dropped or violently vibrated, it is not in a fixed state. When the frame 1 encounters a disturbance such as a security attack, the system formed by the relationship between the subframe 2 and the subframe 3 causes intense resonance or misalignment, but the protrusion 1a of the frame 1 The engagement hole 2C of the subframe 2 that is engaged with the required clearance is
The receiver has the role of regulating this vibration to a predetermined amplitude and suppressing severe resonance phenomena, and also constitutes a displacement regulating means that regulates the positional deviation of the frame 1 within the range of the clearance amount. For example, when the surface facing the base (not shown) of a system device including a recording/reproducing device is relatively misaligned, and the plurality of fixing screws 2b and 3b are tightened, Due to distortions occurring locally in the frame 1, the respective screws 9a that connect the sub-frame 2 and sub-frame 3 to the frame 1, and the relative conforming action in the circumferential direction around the screws 9, the protrusion 1a of the frame 1 and the sub-frame Engagement hole 2c of frame 2
All you have to do is set the required clearance so that they do not come into contact with each other.

The above-described relationship between the protrusion 1a of the frame 1 and the engagement hole 2C of the sub-frame 2 is suitable when the frame 1 has low rigidity and is subject to large displacements due to external disturbances such as dropping, severe vibrations, and @ strikes. The frame 1 has high rigidity, so it cannot be dropped or subjected to strong vibrations.

In cases where the displacement due to disturbances such as impact is small, or when the boss 1m (
Alternatively, if the frame 1 can be sufficiently supported by the second boss In shown by the two-dot chain line in FIG. The partial frame 1 can be constructed simply by mounting a carriage 6 and a step motor 7 (not shown), and can naturally be extremely lightweight.

In the recording and reproducing device configured as described above, the main body of the recording and reproducing device is constructed with high rigidity, and the mounting member is constructed with low rigidity, so that the mounting member is deformed. Unlike the idea of preventing distortion of the main body of the recording and reproducing device by doing so, subframes 2 and 3 have the basic rigidity structure, and the subframes 2 and 3 are used to prevent the recording and reproducing device from being distorted. Frame 1, which is equipped with elemental functions of It is only attached to the elemental function of regeneration, and does not have anything to do with its basic rigidity, so it is quite simple, can be flexible, and has many opportunities to be carried. In order to meet the recent needs for lighter recording and reproducing devices attached to word processors, laptop computers, etc., it is also possible to form them, for example, by die-casting aluminum.
Preferably, it is made of lightweight material such as plastic material.

As mentioned above, the sub-frame 2 and the sub-frame 3 are connected by the screws 9a and 9 toward the substantially planar center of gravity of the frame 1, which is equipped with the above-mentioned recording/reproducing element functions. Even if the frame l is pivotally mounted and encounters a disturbance such as severe vibration or impact when the recording/reproducing device of this embodiment is attached, the frame l, which is pivotally mounted in a floating state as described above, is able to maintain its balance. It is designed to ensure that it does not adversely affect the elemental functions of recording and playback, and in particular, it guarantees the compatibility of data recorded on the disk as a recording medium, which is the most important characteristic for a recording and playback device. In order to do this, deviations are prevented from occurring in the relative position of the standardized track position of the disk and the head that performs recording and reproduction.

In this embodiment with the above-described configuration, it has become possible to realize a plastic frame for a recording/reproducing device, which has been difficult to achieve due to lack of rigidity even though attempts have been made to reduce weight and cost.

Therefore, a structure that takes full advantage of the characteristics of this plastic frame will be explained below.

In FIG. 1, a disk-shaped recording medium (not shown) (hereinafter referred to as a disk) is equipped with a head 5 that sends and receives signals, and is guided so as to be movable in the radial direction of the recording medium (not shown) and can be freely accessed. The carriage 6 is provided with a rack 6a parallel to its moving direction, and the rack 6a is preloaded against a pinion 7a which is a rotary output shaft of a step motor 7 mounted on the frame 1. (Not shown in the figure 113) It has an interlocking configuration.

The carriage 6 is access-driven in accordance with the movement of the step motor 7.

As will be described in detail later, the step motor 7 is attached to the frame 1 via a plate 7b, and is fixed to the portion 1b.

By the way, in order to guarantee data compatibility, recording and reproducing devices standardize and define the recording and reproducing position in the radial direction with respect to the disk as a recording medium (hereinafter, this standardized recording and reproducing position is referred to as a track position). Therefore, the relative position of the track position and the recording/reproducing head must be adjusted to a predetermined positional relationship.

Therefore, in the above-described embodiment of the present invention shown in FIG. 1, the relative positional relationship between the track position and the head is adjusted as follows.

First, to install the step motor 7, rotate the outer body of the step motor 7 with a preload applied to it, and apply preload to the pinion 7a configured on the rotational output shaft of the step motor 7. The carriage 6 is moved via the engaging rack 6a (not shown), and the relative position of the track position of the disk (not shown) and the head 5 is adjusted to a predetermined positional relationship, and after this adjustment, the step motor 7 is moved. Adjust using the procedure called fixing.

The stop position of the rotational output shaft of the step motor is determined by the positional relationship formed between the stator and rotor, and when the outer body of the step motor is rotated, the rotational output shaft also rotates. When the outer body of the step motor 7 is rotated as shown in FIG. 6 moves to adjust the relative position of the track position of the disk (not shown) and the head 5.

The adjustment method of this embodiment, which performs adjustment according to the procedure described above, is to adjust the relative positional relationship between the track position of the disk (not shown) and the head 5 by rotating the outer body of the step motor 7 in the circumferential direction. By doing so, the position of the head 5 in the linear direction is adjusted, and fine position adjustment is possible.

Next, we will discuss a mechanism that allows the delicate relative positional relationship between the track position and the head to be easily adjusted and maintains the adjusted state of the relative position without causing any deviation.
This will be explained below based on FIGS. 2 to 5.

Figure 2 is a detailed view of the main parts of Figure 1, and is a diagram of the step motor fixed structure.The right half and the right half of the dashed line in the figure show different states, but the structure is exactly the same. It is.

Figure 3 is a front view of Figure 2, and is a front view of the step motor fixed. Each shows a different state.

Fig. 4 is a diagram explaining the main part of Fig. @2, and is an explanatory diagram of the step motor guide, and Fig. 5 is a diagram showing a cross section of the main part of Fig. 4, which is a guide structure diagram of the step motor. .

In FIGS. 2 and 3, the step motor 7 is equipped with bearings at both ends in the axial direction, and rotatably supports a binion 7a (binion not shown in FIG. 2), which is configured as a rotating output shaft. The outer periphery of the bearing on the other side is frame 1.
The step motor 7 is fitted with a guide hole 1d having a slight clearance, and the step motor 7 is mounted thereon and also serves as a boss 7c for forming a position reference.

The step motor 7 is provided with a mounting plate 7b extending on both sides and bent into a substantially convex shape, and the mounting plate 7b is a mounting plate 7b that applies a necessary preload to the step motor 7. As a means, the step motor 7 has an open lower θ on the outside of the outer body, and has a structure that can be elastically displaced in order to provide the required elasticity in the axial direction of the step motor 7.

Note that the size of the opening lower e may be set depending on the required elastic force.

On the other hand, the frame 1 has a reference surface 1c in the axial direction of the step motor 7 and a mounting section 1 corresponding to the mounting plate 7b.
b, and the mounting plate 7b is attached to the part 1b.
The plate 7b has a slightly wider slit Ig, and the mounting plate 7b engaged with the slit Ig is pressed by the pressing surface 1f, and undergoes a required elastic displacement to press the step motor 7 against the reference surface 1c.

In addition, in order to set the step motor 7 by engaging the mounting plate 7b with the mounting part 1b, the mounting shown in Fig. 3 requires rotating the step motor 7 approximately 90 degrees from the position of the plate 7b. The boss 7C is inserted into the guide hole 1d formed in the frame 1, rotated to the state shown in FIG. 3, and attached to the holding surface 1f by engaging the plate 7b.

When the step motor 7 is rotated to engage the mounting plate 7b with the holding surface 1f, the mounting plate 7b is elastically displaced to provide the required elasticity. It is preferable to form a slope or the like for guiding the engagement on one of the plates 7b (not shown).Next, the fixing structure of the step motor 7 will be explained.

On the left side from the point 1 ¥ line in Figures 2 and 3, adhesive 1
6, the mounting plate 7b is attached to the frame 1.
is fixed, and in the above-mentioned installation, the plate 7b is attached to the holding surface i.
The stepper motor 7 is held and fixed to the reference surface 1c by being pressed by the reference surface 1c, and has sufficient strength to hold the stepper motor 7.

On the other hand, on the right side from the - dotted chain line, it is fixed with screws 15, and in the same way as on the left side from the - dotted chain line, the above-mentioned mounting is done on the plate 7b.
is held down by the presser 1f and undergoes the required elastic displacement, and the screw 15 is tightened while the step motor 7 is held against the reference surface 1c. As shown in FIG. 2, the plate 7b is attached by tightening the screw 15. Furthermore, it is pressed and fixed to the receiving surface 1e of the frame 1 with a slight elastic deformation, and has sufficient strength to hold the step motor 7.

Naturally, when the plate 7b is attached by tightening the screws 15, the elastic displacement of the plate 7b is small, and this displacement does not affect the function or positional accuracy of the step motor 7 at all.

In FIGS. 2 and 3, the step motor 7 is fixed by filling the adhesive 16 on the left side from the - dotted chain line, and is fixed with the screw 15 on the right side from the - dotted chain line, but the left and right fixing The means may be completely reversed, or the same fixing means may be combined.

Next, in order to install the step motor 7 described above in FIG. A preload is applied to (
(Omitted in the figure) @ An adjustment structure for moving the carriage 6 via the mating rack 6a and adjusting the relative position of the track position of the disk (not shown) and the head 5 to a predetermined wl relationship will be explained. .

First, the step motor 7 is attached with a back plate 7d on the opposite side, and as shown in FIG. 3 (only the right half is shown in FIG. 3), the back plate 7d includes: A plurality of holes provided at symmetrical positions for engaging a pin spanner or the like from behind the step motor 7? f (if a special spanner etc. is considered, it may be a convex part instead of a hole), and at least one part shown in Fig. 3 that can be engaged with a standardized general hexagon spanner or other square spanner. The step motor 7 constitutes a spanner engagement section consisting of a pair of facing surfaces, and can be rotated by the rotation of a spanner that matches the shape of each section.

On the other hand, the gear 7bl is mounted on the outer periphery of the plate 7b, and the 21st! i? The gear jig 1 is configured to mesh with the gear jig 14, which is shown by the two-dot chain line in FIG.
It can be rotated following the rotation of 4.

Note that this gear jig 14 is unnecessary for the function of the recording/reproducing apparatus, and is removed after the rotation of the step motor 7 is adjusted.

In FIG. 2 and FIG. 3, the rotation YI adjustment structure of the step motor 7 described above is illustrated redundantly, but these are independent structures, and may be employed in duplicate or independently. You can also adopt it.

The details of the fixing structure and rotation adjustment structure of the step motor 7 have been explained above, but the next more important structure is the guide hole 1d and the boss 7 formed in the frame l mentioned above.
The detailed structure that C engages and forms the reference position for mounting the step motor 7 will be explained based on FIGS. 4 and 5.

FIG. 4 is a diagram for explaining the main part of FIG. 2, and is a diagram for explaining the guide of the step motor. FIG. 5 is a diagram showing a cross section of the main part of FIG. 4, and is a diagram of the guide structure of the step motor.

In FIG. 4, a boss 7C that engages with the guide hole 1d formed in the frame 1 described above and serves as a reference for the mounting position of the step motor 7 is indicated by a chain double-dashed line in the figure.

Although FIG. 4 is somewhat exaggerated to make the explanation easier to understand, as shown in the figure, the boss 7C engages with the guide hole 1d with a slight clearance.

On the other hand, as a means for removing the engagement clearance, a protrusion B1j is provided in the guide hole 1d so as to form an inscribed circle slightly smaller than the outer diameter of the boss 7C. The inserted boss 7C is supported by the protrusion 1j without creating any clearance.

By the way, as mentioned above, the boss 7c is attached to the projection IJ of the guide hole 1d.
In order to insert and engage without clearance, use the protrusion I.
J or the boss 7C is deformed in some way to make the relative shapes match, but in this embodiment, the boss 7C also serves as a bearing, so this bearing is arranged so that the function is not affected. In order to positively deform the protrusion 1j, the cross-sectional shape of the protrusion 1j is formed into a substantially triangular shape, so that the apex thereof can be easily deformed.

Further, as a means for easily guiding the insertion of the boss 7C into the guide hole 1d, a protrusion 1j is formed from the middle of the guide hole 1d, and a slope 1jl is further formed on the protrusion 1j.

In the engagement structure between the guide hole 1d and the boss 7C configured as described above, although the boss 7C and the guide hole 1d essentially have a slight clearance, their combined shapes affect the function. The step motor 7 can be easily aligned with the outer body without any rotational movement, and the engagement clearance can be removed. There is no slight movement of just a few μm.

By the way, in FIG. 4, three protrusions 1j are shown, but considering the above purpose, the purpose can be achieved even with one protrusion, and a plurality of protrusions may be used, preferably. In order to maintain balance, it is best to configure an odd number.

Incidentally, in the above structure, the workmanship is quite complicated, but in this embodiment, as mentioned above, the technology of constructing the frame 1 from a plastic member has been established, and this fine workmanship is easily possible. There is.

Above, we have explained the structure that takes full advantage of the features of the plastic frame.Next, we will explain that the main parts are pivoted in a so-called floating state by the sub-frames 2 and 3, which have a basic structure of rigidity. The characteristics of the frame 1, which is made of a plastic material and is equipped with X a RR, which is necessary for recording and reproducing, and which suppresses the occurrence of distortion, and which may be very simple and weak, will be explained.

The most important thing for recording/reproducing equipment is to guarantee the compatibility of the data recorded on the disc as a recording medium, and to ensure that the disc is standardized! - It is well known that it is essential that the relative position of the rack position and the recording/reproducing head be configured in a predetermined positional relationship.
In particular, recording and reproducing devices used in environments where there are differences in temperature and humidity must ensure that the relative position of the standardized track position of the disk and the head that performs recording and playback remains within a specified range even in environments where there are differences in temperature and humidity. It is necessary to devise a positional relationship.

Therefore, the above-mentioned device of this embodiment will be explained based on FIG. 9.

FIG. 9 is an explanatory diagram illustrating the main part of FIG. 1, and shows an irregular cross section and a schematic diagram.

In FIG. 9, a frame 1 for mounting a recording/reproducing element MI4 made of plastic material is mounted with a main shaft motor 4 for chucking and rotationally driving a disk 40 fixed with a screw 10. .

The carriage 6 (not shown) on which the head 5 is mounted and guided so as to be movable in the radial direction of the disk 40 has a rack 6a formed as a part of the carriage 6, which is engaged with a pinion 7a, and is driven by the rotation of the pinion 7a. and move.

The mounting structure of the head 5 is made by pointing the support plate 5a and spacer 6b of the head 5 so that the fixing point is clear)P2
Do the first adhesion with the spacer 6b and the carriage 6
A second bond is applied at point P1, and further, to prevent the support plate 5a of the head 5 and the spacer 6b, and the spacer 6b and the carriage 6 from floating in the plane direction,
The support plate 5a of the head 5 is made from a point P2 as a base point, and the spacer 6b is made from a point P1 as a base point so that it can be freely expanded and contracted. Each of the parts is glued and fixed using the third method.

In this embodiment, the frame 1 is made of plastic material, and the base 4 of the main shaft motor 4 has a temperature expansion coefficient of α1.
a is made of iron material, has a temperature expansion coefficient of α2, and a carriage 6
is made of iron material, has a temperature expansion coefficient of α3, and has a spacer 6b.
is made of a plastic material and has a temperature expansion coefficient of α4, and the support plate 5a is made of stainless steel material and has a temperature expansion coefficient of α5. The B5ff coefficient is (
17±8) Book 1O-610C, humidity expansion coefficient is (0-1
5) Book 10-'/%RH and specified saletail.

Incidentally, two screws 10 for fixing the main shaft motor 4 to the frame 1 are arranged approximately near the center of the main shaft motor 4 in view of the positional relationship between the main shaft motor 4 and the head 5, as shown in FIG. The frame 1 is made of plastic material and has a temperature expansion coefficient of α1, and the frame 1 is made of iron material and has a temperature expansion coefficient of α2.
The bases 4a of the spindle motors 4 each having a different temperature expansion coefficient are connected together, and even if a temperature change occurs in the bonded state where each has a different temperature expansion coefficient, the frame 1 is placed approximately near the center of the spindle motor 4 and the screws are fixed. It is configured to expand and contract in the direction of the head 5 with the position 10 as a base point.

In order to stably fix the main shaft motor 4 to the frame 1, it is desirable to use a plurality of screws 10 and arrange them on the outer circumferential side of the base 4a. The bases 4a of the bases 4a have different coefficients of thermal expansion, and if a temperature change occurs in their combined state, the expansion/contraction point at which the frame 1 expands/contracts in the direction of the head 5 becomes unclear, or both Due to the different amounts of expansion and contraction, the frame 1 or the base 4a of the main shaft motor 4 may be deformed, such as warping, and the relative position of the main shaft motor 4 and the head 5 may be misaligned.

Therefore, in this practical example, even if the frame l or the base 4a of the main shaft motor 4 expands and contracts differently, the expansion and contraction stress is kept to a minimum, the expansion and contraction reference point of the frame 1 is made clear, and the main shaft motor 4 is moved to the frame l. In order to stably fix it, two screws 10 are placed near the center of the main shaft motor 4 in view of the positional relationship between the main shaft motor 4 and the head 5 as described above. The base 4a of the frame 1 has a surface that tends to protrude slightly so that the base 4a of the main shaft motor 4 comes into positive contact with the base 4a of the main shaft motor 4.

In the above configuration, when a temperature change of Δ0C occurs, a deviation between a predetermined track position of the disk 40 and the relative position of the head 5 (hereinafter referred to as off-track) is expressed by the following equation.

Off-track amount = [(Alα1)-(B*α3)-(
C) Large α4) + (D*α5) −El(17±8)]*
10'''6*Δ(0C)Here, it is clear that the above control (Alα1) is the most important point in order to minimize the amount of off-track due to temperature changes,
In this embodiment, as shown in FIG. 1 and described above, the carriage 6
The access drive of the binion 7a that engages with the rack 6a
The off-track caused by the temperature change will be explained from another perspective.

In FIG. 1, a frame 1 made of plastic material and equipped with recording and reproducing element functions is forced to have a complicated shape, especially in the vicinity of the step motor 7 and carriage 6, and in plastic molding, the gate position and shape etc. Even if we do our best to improve this, the latent flow of plastic will become complicated.

- As a means of numerically controlling the temperature expansion coefficient and rigidity of plastic molded products, a pure plastic material is filled with a few percent of glass fiber, etc., and molded to take advantage of the characteristics of glass fiber in the length orientation direction of the glass fiber. However, in plastic molding of complex shapes, the latent flow of plastic becomes complicated even if the gate position, shape, etc. are maximized, and for example, if glass fiber is In the molding of the filled plastic material, the orientation direction of the glass fibers is completely irregular, making it possible to control the properties of the glass fibers.

That is, the rigidity and coefficient of thermal expansion of plastic molded products differ slightly depending on the location, and when viewed from a microscopic perspective when encountering temperature changes, the plastic molded product does not expand or contract in a similar manner to its initial shape.

If the above-mentioned contents are applied to the frame 1 made of plastic material as shown in FIG. Even if it is molded, the orientation direction of the glass mR4# becomes completely irregular, making it difficult to control by taking advantage of the characteristics of glass fiber. From a microscopic point of view when encountering this problem, it is difficult to control the expansion and contraction in a manner similar to the initial shape.As shown in Fig. 1 and described above, the direction of movement of the carriage 6 and the step motor 7 are originally approximately orthogonal (the rack 6a
and the binion 7a are arranged in such a manner that they are substantially perpendicular to each other.
From a microscopic point of view when encountering a temperature change, if similar expansion and contraction is not achieved from the initial shape, for example, if the step motor 7 tilts even slightly in the direction of movement of the carriage 6, the tilted image will change. directly becomes the off-track amount, and the off-track due to the inclination of the step motor 7 is added to the off-track caused by the expansion and contraction of the frame 1 due to (A*α1) described above.

Therefore, the frame 1 of this embodiment is designed to perform expansion and contraction control that is similar to the initial shape even when viewed microscopically when a temperature change is encountered, and also to eliminate differences in rigidity and temperature expansion coefficient depending on location. The following measures can be taken to reduce the amount.

1) By filling a plastic material with a few percent of glass fiber and a few percent of carbon fiber, we were able to obtain the desired rigidity and coefficient of thermal expansion.

This is achieved by filling a plastic material with glass fiber and controlling the orientation direction of the glass 45111, which is difficult to achieve with general control means that control the temperature expansion coefficient and rigidity of plastic molded products. In other words, the carbon fiber functions to control the orientation direction of the glass [1] in a direction different from that of the glass [1], and the lacking properties of one are compensated for by the other.

In this example, as a molding condition for the frame 1, the gate 1p is placed in a position opposite to the step motor 7 and the carriage 6 as shown in FIG. Control the motor 7 and carriage 6 so that the glass mht
The orientation direction of the gate 1p is controlled in the direction of the latent flow (direction from the gate 1p toward the step motor 7 and the carriage 6).

2) Regarding the fiber lengths of the glass fiber and carbon fiber mentioned above, by making the fiber length of the carbon fiber shorter than that of the glass fiber, it is possible to create characteristics that are not determined only by the orientation direction of the glass magnetic layer. is now possible, but preferably the carbon wLPd length is 30% to 7% of the glass fiber length.
It is better to have a short fiber length of 0%.

3) Regarding the filling ratio of the glass fiber T and carbon fiber, glass [15% to 35%, carbon m fiber 5% to 3
It is best to fill it by mixing 5% weight ratio and the rest to the IT ratio of the plastic material, but considering moldability and cost, glass fiber should be 15% to 25%.

It is preferable to mix and fill carbon m fibers at a weight ratio of 20% to 30%.

In addition, the weight ratio of glass fiber is 35%, and the weight ratio of carbon fiber is 35%.
% weight ratio, the moldability becomes extremely poor, and the selection of plastic materials that make up the remaining weight becomes extremely limited.

4) Regarding the rigidity of the frame 1 molded from a plastic material filled with a mixture of glass aim and carbon 41, the bending elastic modulus can be changed to l* by changing the filling ratio.
105Kg/Cm2~2* 105Kg/Cm
2 can be controlled, but as for the rigidity, the higher the rigidity, the better.

5) Regarding the temperature expansion coefficient of the frame 1 molded from a plastic material filled with a mixture of glass fiber and carbon fiber, the temperature expansion coefficient approximately approximates that of the recording medium by adjusting the filling ratio of 12*. 1
Although it is possible to control the temperature from 0-6/°C to 35*lO/°C, the disk 40 cited in this example has a base material made of polyethylene phthalate, and has a temperature expansion coefficient of (17
±8) * Considering that it is specified as 10-'/"C, 15*l O-"/'C~25*l O-'
It is preferable to control the temperature expansion coefficient to about /'C.

As described above, when the recording/reproducing device encounters a temperature change, the difference in temperature expansion coefficient depending on the location of the frame 1 made of plastic material is reduced, and the expansion and contraction are controlled to be similar to the initial shape, thereby minimizing the amount of off-track. Having described some of the improvements, the features of the frame 1 made of the plastic material described above will now be described from another perspective.

A) Plastic materials are originally insulators and also have the property of being easily charged with static electricity, but as mentioned above, the frame 1 made of the plastic material of this example is filled with a mixture of carbon fibers. It is made of plastic material, has some conductivity, and is not charged with static electricity.

On the other hand, many electronic components such as ICs that are easily destroyed by static electricity are incorporated in recording and reproducing devices, and
The same applies to the surroundings of system devices including the recording/reproducing device, and antistatic measures are also an essential condition.

Therefore, the frame 1 of this embodiment, which is molded from a plastic material mixed and filled with carbon fiber, has some conductivity, and is free from static electricity and other charges is effective in preventing electrostatic damage to electronic components such as ICs. play a role.

The frame 1 of this embodiment, which has a slight conductivity and is not charged with static electricity, does not attract dust or dirt due to static electricity, and does not require special consideration in the installation location, installation method, or handling. There's no need.

On the other hand, regarding the measures to prevent static electricity in the frame 1, the plastic material in this example is mixed with carbon 41 fibers and filled to provide some conductivity, which achieves the purpose. In the frame 1 made of plastic material, the plastic material is filled with a few percent of glass fiber and a few percent of carbon fiber, but for the above purpose, only a few percent of carbon 41 fiber is filled to achieve the required rigidity. However, when filling only carbon fibers, it is preferable to increase the filling amount of carbon #Am in consideration of the above-mentioned rigidity.

B) As mentioned above, the disk 40 cited in this embodiment has a base material made of polyethylene phthalate, and has a humidity expansion coefficient of (0 to 15)*10-6/%R in addition to the temperature expansion coefficient.
H, and in order to minimize the amount of off-track due to humidity changes, similar to the off-track due to temperature changes described above in Fig. 9, the humidity expansion coefficient control of frame 1 is the most important point. Although this is obvious, it is difficult to control this with a conventional frame made of metal such as aluminum die-casting because it does not expand or contract due to changes in humidity.

On the other hand, the frame 1 of this embodiment is molded from a plastic material, and due to the inherent hygroscopicity of the plastic material, it expands and contracts due to changes in humidity, so that the amount of off-track caused by changes in humidity can be minimized. Cancellation design is easily possible.

Next, an application example of the frame structure made of plastic according to this embodiment will be explained based on FIGS. 6 and 7.

FIG. 6 is an application example of FIG. 2, and FIG. 7 is an application example of FIG. 3, and each is a step motor fixing structure diagram.

FIG. 3 is a front view of the step motor fixed.

In FIGS. 6 and 7, the frame 11 of the step motor 17 is engaged with a boss 17c which also serves as a bearing, thereby forming a reference for the mounting position.

The step motor 17 extends to both sides and has a flat mounting plate 17b.
is configured as a part of the frame 11 and the step motor 1
The mounting part 11b is capable of configuring the required elasticity in the axial direction of 7.
The step motor 17 is engaged with the axial reference surface 11c of the step motor 17, and is pressed against the reference surface 11c in the axial direction.

5.In order to set the step motor 17 by engaging the mounting plate 17b with the mounting part 11b, the mounting shown in FIG.
Insert the post 17c into the frame 11 in a rotated position,
It is rotated to the state shown in FIG. 7, and the mounting portion 11b and the mounting plate 17b are engaged with each other.

The difference between this application example using the above tn structure and the embodiment described above in FIGS. 2 and 3 is that the necessary attachment to the step motor 17 is means for applying preload, and as shown in FIGS. In this case, the mounting plate 7b has an elastic function, but in this application example, although the mounting plate 17b also has a slight elastic function, the frame 11 is actively mounted on the part 11.
b has an elastic function, and as mentioned above, frame 1
At the stage when the technology of composing 1 with plastic material is put into practical use, it is an effective means of demonstrating its characteristics.

The other configurations are exactly the same as those described above in FIGS. 2 and 3, and the fixing structure of the step motor 17 is shown in a simplified manner in FIGS. 6 and 7. Not only the fixing structure using adhesive, but also fixing means such as screws can be easily implemented with some design consideration, and this application example is shown in Figs.
It exhibits exactly the same functions and features as those described above in the figures.

Next, another application example of the present invention will be explained based on FIG. 8.

FIG. 8 is an applied example of FIG. 1, and is an exploded perspective view of the recording/reproducing apparatus.

In FIG. 8, a frame 1 for mounting elemental functions of recording and reproduction includes a main shaft motor 4 as a rotational drive means for chucking and rotationally driving a disc-shaped recording medium (not shown). A carriage 26 is mounted with a head 5 serving as a signal conversion means for transmitting and receiving signals to and from the recording medium, and is movably guided in the radial direction of the recording medium (not shown) and is accessible.
．． A step motor 27 is installed to drive the carriage 26 for access.

In FIG. 8, a disc-shaped recording medium (not shown) (hereinafter referred to as a disk) and a head 5 for transmitting and receiving signals are mounted and guided so as to be movable in the radial direction of the recording medium (illustration #3). The freely accessible carriage 26 is equipped with a needle-shaped lead bin 26a, and the lead bin 26a is configured as a rotary output shaft of a step motor 27 mounted on the frame 1, and a lead screw is arranged parallel to the moving direction of the carriage 26. The carriage 27a is configured to be screwed together with a preload applied thereto (not shown), and the carriage 26 is driven to access by the movement of the step motor 27.

To adjust the relative positional relationship between the track position of the standardized disk (not shown) and the head 5, the outer body of the step motor 27 is rotated, and a lead screw 27a configured on the rotational output shaft of the step motor 27 is adjusted.
The carriage 26 is moved via the lead bin 26a screwed into the lead bin 26a, which is preloaded (not shown), and the relative position of the track position of the disk (not shown*) and the head 5 is adjusted to a predetermined positional relationship. .

Regarding the position adjustment of the delicate relative positional relationship between the track position and the head in this application example, and the mechanism for maintaining the adjusted state of the relative position without causing any deviation, FIGS. 2 to 5 and 6, All the contents described above based on FIG. 7 can be applied.

Furthermore, when the recording and reproducing apparatus is used in an environment where the temperature and humidity differences described above occur based on FIG. This measure functions similarly in the seek structure of the carriage, which is constructed by a combination of a lead screw and a lead bin in this application example.

Although detailed illustrations and explanations are omitted, in addition to the off-track that occurs when the frame 1 expands and contracts in the radial direction of the recording medium, in the carriage seek structure constituted by a combination of a lead screw and a lead bin, the carriage 2 shown in FIG.
If the parallelism of the lead screw 27a, which is arranged parallel to the moving direction of the lead screw 27a, is out of alignment, the contact position between the lead portion of the lead screw 27a and the dobbin 26a will be out of alignment, and off-track will be added depending on the lead angle. However, according to the configuration of the frame 1 described above based on FIG. 9, when the recording/reproducing device encounters a temperature change, the difference in temperature expansion coefficient depending on the location of the frame 1 made of plastic material is reduced, and the initial Similar expansion and contraction control is possible due to the shape, there is no deviation in the parallelism of the lead screw 27a arranged parallel to the moving direction of the carriage 26, and it is easy to control the amount of off-track to a minimum.

The seek structure of the carriage in this application example shown in Fig. 8 is achieved by a combination of a lead screw and a lead bin, but there is another application example, which is not shown and explained, but is a well-known technique using a step motor. A structure is known in which a steel belt is wound around the capstan in an α-shape, and both ends of the belt are joined to the carriage.In this structure, too, the position adjustment of the relative position of the disk track position and the head is performed step by step. In the configuration where rotation of the motor is performed, all of the above-mentioned contents based on Figures 2 to 5, Figures 6 and 7 can be similarly applied, as well as the control to minimize the amount of off-track. , can be applied as well.

By the way, system devices including modern recording and reproducing devices are becoming smaller and smaller, and their internal configurations are becoming more densely packed in electronic devices, which can cause various types of noise such as power supply noise and radiation noise. This occurs frequently and tends to have an adverse effect on recording and reproducing devices.

What should be noted here is how to cut out these various noises. , 3b, and fix it from the base (not shown) side of a system device including a recording/reproducing device, for example, by tightening screws from the side of the base (not shown). A case 8 is arranged so as to be in pressure contact with the frame 2 and the sub-frame 3. If the case 8 is made of a light metal with excellent conductivity such as aluminum or a metal with excellent magnetic shielding property, a suitable type of noise reduction can be achieved. Furthermore, since the case 8 has a structure in which the case 8 comes into pressure contact with the sub-frames 2 and 3 due to some elasticity when screwed and fixed, the sub-frames 2 and 3 are made of conductive material.

When the shield is made of a metal material such as a magnetic material, the effect of shielding the element functions of recording and reproduction is further improved.

To explain the shield protection effect in more detail, as described above in FIG. It is made of a plate-like member, which is bent from both sides to form a substantially rectangular tube shape, and has a plurality of convex portions 8b having larger apexes at each end where both ends coincide.
and a convex portion 8c, and the concave portion formed between the convex portions 8b and the convex portion 8c are formed so as to coincide with each other, so that the so-called fastener connection is engaged with both from the thickness direction and does not separate from the surface direction. There are no gaps or the like in the fastener connection part, and it provides a uniform and strong shielding effect with no directionality against noise sources.

By the way, as mentioned above, the frame 1 of this embodiment has a structure that is effective when formed from a plastic material, but unlike a conventional frame formed from aluminum die-casting or the like, it is essentially However, there is very little protection against various noises such as power supply noise and radiation noise.

Therefore, when the frame 1 made of plastic material and the case 8 having the above structure are combined as in this embodiment, almost the entire outer periphery of the frame 1 made of plastic material, which is inherently weak against noise, is covered. By providing protection, a uniform and strong shielding effect with no directionality is achieved against the noise source, enabling stable recording and reproduction unaffected by noise.

Furthermore, if the frame that determines the i amount of the recording/reproducing device is made of a plastic material, and the case 8 is made of a light alloy such as aluminum, it becomes possible to create an extremely lightweight recording/reproducing device.

Incidentally, the case 8 of this embodiment is made of two plate-like members, which are bent from both sides into a substantially rectangular tube shape, and the so-called fastener connection described above is used at the portion where both ends coincide. There is no gap or the like in the fastener joint part, and it is possible to provide a recording and reproducing device that has a neat external shape, is easy to handle, and has an aesthetic appearance.

On the other hand, the case 8 formed into a substantially rectangular tube shape in this embodiment is made of two plate-like members, which are bent from both sides to form a substantially rectangular tube shape, and the portions where both ends coincide are as described above. They are connected with a so-called fastener, and taped with tape 8d as a means to prevent the fastener-joined part from separating.
Of course, it is also possible to form the vibrator using a substantially rectangular cylindrical vibrator material.

Further, the case 8 formed in the substantially rectangular tube shape of this embodiment has a first
As shown in the figure and described above, it is made of a single plate-like member, which is bent from both sides into a substantially rectangular tube shape, and the portion where both ends meet at the bottom of the recording/reproducing device is connected with the so-called fastener described above. However, in view of the purpose of shield protection described above, the formation means is not limited to this method; for example, it may be formed by joining on both sides or the top,
- Instead of forming it from a single plate-like member, the forming means may be formed by, for example, dividing it into an upper part and a bottom part, or by joining together parts which have been divided into a right side and a left side.

Furthermore, in this embodiment, as shown in FIG. 1 and described above, the subframe 2 and the subframe 3 are arranged on both sides of the frame 10, and the subframe 2 and the subframe 3 are made of a material that has electrical conductivity with the case 8. By forming the right or left side of the case 8, it is possible to achieve a similar shielding protection effect even if the right side or left side of the case 8 does not have a completely joined structure.

[Effects of the Invention] As described above, the present invention has many of the above-mentioned practical effects among the embodiments of the present invention, and in particular, in the recording and reproducing apparatus of the present invention, By including means that do not cause deformation or distortion, and by forming the frame from a plastic material and having a temperature expansion coefficient approximately approximate to that of the recording medium,
Even if it encounters a temperature change, the frame made of plastic material equipped with the recording/reproducing function expands and contracts in a manner that approximates the expansion and contraction of the recording medium, and maintains the standardized recording/reproducing track position of the recording medium. On the other hand, the relative position of the signal converting means for transmitting and receiving signals to and from the recording medium is controlled to approximately approximate positions, thereby achieving stable recording and reproduction.

Also, of course, the frame made of plastic material and equipped with a recording/playback function is inexpensive.

It is highly mass-producible and extremely effective in reducing the weight of recording and reproducing devices, and there is a growing market need for recording and reproducing devices installed in word processors, laptop computers, etc., which are often carried around these days. The practical effects of the present invention are extremely large, such as easily meeting the emerging demand for a "lightweight recording/reproducing device."

[Brief explanation of the drawing]

FIGS. 1 to 5 show the most suitable embodiment of the recording/reproducing apparatus of the present invention, and FIGS. 6 and 7 show examples of its application.
FIG. 8 shows another example of application. FIG. 9 shows the main part of FIG. 1. Fig. 1 is an exploded perspective view of the recording/reproducing device, and Fig. 2 is a detailed view of the main parts of Fig. 1, including a step motor fixing structure diagram and a third
Figure 2 is a front view of the step motor fixed, Figure 4 is a diagram explaining the main parts of Figure 2, and Figure 5 is a diagram explaining the guide of the step motor, and Figure 5 is the main part of Figure 4. It is a figure which shows a partial cross section, and is a fixed front view of a step motor. FIG. 8 is an applied example of FIG. 1, and is an exploded perspective view of the recording/reproducing apparatus. FIG. 9 is an explanatory diagram illustrating the main part of FIG. 1. FIGS. 10 and 11 are diagrams for explaining the conventional technology, in which FIG. 10 is a rear perspective view of the conventional recording and reproducing apparatus of the first example, and FIG. 11 is a rear perspective view of the conventional recording and reproducing apparatus of the second example. FIG. 1. 2. 2a. 3. 3a. 4. 6. 6a. 7. 8. Frame Subframe Fixing Screw Subframe Fixing Screw Main Shaft Motor Carriage Rack Step Motor Case Above Applicant Seiko Epson Co., Ltd. Agent Patent Attorney Kizobe Suzuki and 1 other person

Claims (1)

[Scope of Claims] 1) A. A rotary drive means for rotationally driving a disc-shaped recording medium; B. A signal conversion means for transmitting and receiving signals to and from at least the recording medium, which is installed in the radial direction of the recording medium. a frame equipped with a recording and reproducing function comprising a carriage means that can be freely accessed, and an access drive means that allows access to the carriage means, and means that does not cause deformation or distortion to the frame, and the frame is made of a plastic material. A recording/reproducing device characterized in that the recording/reproducing device has a thermal expansion coefficient approximately approximate to the thermal expansion coefficient of the recording medium. 2) The temperature expansion coefficient is 12*10^-^6/℃~3
The recording/reproducing device according to item 1), characterized in that the temperature is within the range of 5*10^-^6/°C.