JPH0229975A - Recording/playback device - Google Patents

Abstract

PURPOSE:To stabilize the fixing of a step motor by giving a fitting pre-load by converting a fitting part, pressing also the fitting part with a screw to be elastically converted until it comes into contact with a receiving part so as to fix the step motor accordingly. CONSTITUTION:A fitting plate 7b fixed adhesively to the step motor 7 is pressed by a pressing surface 1f of the fitting part 1b to be turned into a prescribed elastic conversion so as to press the step motor 7 against a reference plane 1c by giving the pre-load. Under these circumstances, when the fitting part 1b is pressed by the screw 15, the fitting part 1b is elastically converted until it is brought into contact with a receiving surface 1e to be fixed, where relative irregularity between the reference plane 1c in the axial direction and the step motor 7 and stress caused by tightening the screw are absorbed by the elastic conversion of the fitting part 1b, thus stabilizing the fixing of the step motor 7.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement in the mechanical structure of a recording/reproducing device that records on or reproduces information from a rotating disk, and more specifically relates to a step motor that drives the movement of a head. Regarding the fixed structure of.

[Prior Art] A typical example of a step motor fixing structure for driving the movement of a head of a conventional recording/reproducing apparatus for recording or reproducing data on or from a rotating disk is the structure shown in Publication No. 49-14581. This is known in detail and is shown in FIGS. 9 and 10 in more detail.

Figure 9 is a side view of a conventional recording/reproducing device, and Figure 1O is a side view of a conventional recording/reproducing device.
FIG. 3 is a partial rear view of the figure.

In FIGS. 9 and 10, a head 37 that records or reproduces data on a disk 31 which is a recording medium and is driven to rotate.
A carriage 35 mounted thereon and movably guided in the radial direction of the disk 31 is engaged with a lead screw 34 rotationally driven by a step motor 42.
It has a structure that moves by following NtjJ of the step motor 42.

The step motor 42 is fixed by a screw 41, and a mounting hole 42a through which the screw 41 is inserted is elongated in the circumferential direction around the motor shaft.
The step motor 42 is configured to be rotatable in the direction of arrow 40 in the figure about the motor shaft by loosening the screw 41.

On the other hand, in order to guarantee data compatibility, recording and reproducing devices
The radial recording/reproducing position of the disk as a recording medium is standardized and defined (hereinafter, this standardized recording/reproducing position is referred to as the track position), and the relative position of the recording/reproducing head to this track position is , it is necessary to arrange them all in a predetermined positional relationship.

Therefore, Figure 9 and #! In the conventional example shown in FIG. 10, the relative position of the track position and the head was adjusted as follows.

First, the screw 41 that fixes the step motor 42 is slightly tightened, and the outer body of the step motor 42 is rotated with a slight frictional force applied in the direction of rotation of the step motor 42 to engage with the lead screw 34. The step motor 42 is fixed by moving the carriage 35, adjusting the relative position of the disk 31 and the head 37 to a predetermined positional relationship, and then firmly tightening the screw 41 after this adjustment. I was adjusting.

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 42 is rotated as shown in FIG. The track position of the disk 31 and the relative position of the head 37 are adjusted.

In the conventional technique of adjusting according to the procedure described above, the relative positional relationship between the track position of the disk 31 and the head 37 is adjusted by rotating the outer body of the step motor 42 in the circumferential direction. Linear position gl
This is an adjustment device that basically allows fine position adjustment, but depending on how tightly the screw 41 is tightened, the screw 41 and the mounting hole 42a of the step motor 42 may be
Since the frictional force of the step motor 42 changes greatly,
When adjusting the relative positional relationship between the track position of the disk 31 and the bed 37 by rotating the outer body of the disc 31, there is a large variation in the rotation torque, and delicate rotation adjustment skills are required. Ta.

Also, when the step motor 42 is fixed by firmly tightening the screw 41 after this position adjustment is completed, the screw 4
1 and the mounting hole 42a of the step motor 42, the step motor 42 rotates slightly in the circumferential direction, makes small movements in a plane with respect to the mounting part, or performs step movement with respect to the mounting part. If the mounting surface of the motor 42 has even a slight relative unevenness, the step motor 42 may be tilted when the plurality of screws 41 are tightened.

In other words, the track position of the disk 31 and the head 37
The minute digit of the relative position of 1! Even if the Ill adjustment is completed,
When fixing the step motor 42 by tightening the screws 41, if the step motor 42 undergoes slight rotation or slight movement in a plane, or if the step motor 42 is tilted, it may be difficult to adjust the position even after making minute position adjustments. regardless of,
The relative positional relationship between the track position of the disk 31 and the head 37 is out of alignment, making it difficult to establish a precise relative positional relationship.

On the other hand, by tightening the screw 41, the step motor 4
2, in order to minimize the deviation of this relative positional relationship, tighten the screw 41 considerably when adjusting the rotation of the step motor 42.
The outer body of the step motor 42 is rotated with a strong frictional force applied in the direction of rotation of the step motor 42, and after fine position adjustment is completed, the step motor 42 is fixed by slightly retightening the screw 41. This is an effective means for suppressing the above-mentioned deviation in the relative positional relationship between the track position and the head 37, but in this case, a large rotational force is required to adjust the rotation of the step motor 42. The mounting part of the step motor may be deformed, resulting in poor adjustment efficiency and difficulty in configuring precise relative positional relationships.

[Problems and Objectives to be Solved by the Invention (1) As mentioned above, in the conventional technology, when adjusting the relative positional relationship between the track position of the disk and the recording/reproducing head, a slight frictional force is applied in the rotational direction of the step motor. When the outer body of the step motor is rotated to make a fine position gII adjustment, and after the first adjustment is completed, the step motor is fixed by tightening the screws, and the step motor rotates slightly in the circumferential direction. The relative positional relationship between the disk track position and the head may be out of order due to movement, slight movement in the plane relative to the mounting part, or tilting of the step motor, even after careful position adjustment. has occurred.

Additionally, if you perform minute position adjustments by rotating the outer body of the step motor while applying a strong frictional force in the rotational direction of the step motor, a large rotational force will be required to adjust the rotation of the step motor. This caused deformation of the step motor mounting part, resulting in poor wR adjustment efficiency and difficulty in configuring precise relative positional relationships.

On the other hand, with the increasing speed and capacity of computers, etc., the recording capacity of modern recording and reproducing devices has expanded dramatically.
The recording and reproducing density (hereinafter referred to as track density) in the radial direction of a disk as a recording medium has become much higher.

In order to support recording and reproducing devices with higher track densities, it is necessary to configure the relative positional relationship between the track position and the head with a deviation of only a few micrometers or less, which requires delicate relative positional adjustment, as described above. With such a conventional structure for adjusting the relative position between the track position and the head, the efficiency of adjustment is poor, and there are many difficulties in constructing a precise relative positional relationship, making it difficult to stably mass-produce the head.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a simple structure that allows for easy adjustment of delicate track positions and relative positional relationships between heads. It is an object of the present invention to provide a mechanism that maintains the adjusted state of the relative position without causing any deviation, thereby facilitating stable mass production even in a recording/reproducing device with a high track density.

[Means for Solving the Problems] The recording and reproducing apparatus of the present invention includes an outer body of a step motor that moves and drives a carriage equipped with a head for recording and reproducing on a disk, which is rotatably mounted by a predetermined angle. In a recording/reproducing device that adjusts the relative positional relationship between a predetermined track position of the disk and the head by rotating the outer body of the motor, a part of the outer body of the step motor is elastically displaced in its axial direction. an axial reference surface and a receiving portion for receiving elastic displacement of the mounting portion are provided on the mounting side of the step motor, and the mounting portion is displaced to apply mounting preload in the axial direction. In addition, the step motor is configured to be fixed by pressing the mounting portion with a screw.

[Operation] According to the above configuration of the present invention, the carriage equipped with a head for recording and reproducing information on a disk is moved and driven, and the outer body is attached so as to be rotatable by a predetermined angle, and the outer body is rotated. , a step motor that adjusts the relative positional relationship between a predetermined track position of the disk and the head has a mounting part on a part of the outer body that can be elastically displaced in the axial direction, and the mounting side of the step motor has a mounting part that can be elastically displaced in the axial direction. A receiving part is provided to receive the elastic displacement of the reference surface and the mounting part, and the mounting part is displaced to apply mounting preload in the axial direction. When the step motor is fixed by pressing the mounting part with a screw, the mounting part is fixed by elastically deforming until it comes into contact with the receiving part, and the elastic deformation of the mounting part absorbs the stress caused by the relative unevenness of the reference surface in the axial direction and the step motor and screw tightening, and the step When fixing the motor, there is no tilting or misalignment, and the motor can be fixed stably.

[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. 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.

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 which is equipped 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 freely accessible;
A step motor 7 for access driving the carriage 6 is installed, and the main shaft motor 4 is fixed with a screw 1O.

On both sides of the frame 1, a sub-frame 2 and a sub-frame 3 are arranged on opposite sides of the frame 1 so as to form two opposing sides facing outside of the frame 1. 2 and the sub-frame 3 are provided with a plurality of fixing screws 2a on opposite surfaces facing outward of the frame 1 as a fixing structure for fixing to a base (not shown) of a device including a recording/reproducing device, for example. , 3a, respectively, forming a surface substantially perpendicular to the outwardly opposing surface of the frame 1, and a plurality of fixing screws 2b, 3b are similarly formed 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 on which the recording/reproducing element 411 described above is mounted. It is centrally connected.

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 has a structure that can be twisted at the screws 9a and the portions connected by the screws 9.

On the other hand, a protrusion 1a for engaging with the subframe 2 is provided at a position away from the part of the frame 1 that 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. Keep yourself engaged.

Note that the subframe 2 and subframe 3, which are connected to the frame 1 by one screw 9a and one screw 9, can move slightly in the circumferential direction around the screw 9a and one screw 9, respectively, when external stress is applied. The structure is configured so that the coupling friction caused by the screws and the external stress are matched, and due to this relative matching effect in the circumferential direction, the relative position in the circumferential direction with respect to the frame 1 equipped with the recording and reproducing element functions is determined. , is adaptable within the required clearance between the engagement hole 2c of the subframe 2 and the projection 1a of the frame 1.

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 formed into a substantially rectangular tube shape is inserted and assembled together in the direction of the rear arrow 11 in the figure, and the case 8 has the above-mentioned recording and reproduction element a function Its role is to cover and protect.

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 a plurality of fixing screws 2b, 3b, the plurality of fixing screws 2a,
3a and a plurality of fixing screws 2b.

3b. For example, when fixing to a base (not shown) of a device including a recording/reproducing device, if it is fixed by tightening the screws from the base side,
The case 8 has some elasticity and has a structure that makes pressure contact with the subframe 2 and the subframe 3.

When fixing the recording/reproducing apparatus of this embodiment with the above configuration to the base (not shown) of a device including a recording/reproducing *f, for example, 1) When fixing from both sides in the lateral direction> As mentioned above. The sub-frames 2 and 3, which are pivoted from both sides of the frame 1, can be used even if there is a relative deviation in the surface facing the base (not shown) of a device including a recording/reproducing device, for example. When the plurality of fixing screws 2a and 3a are tightened, each of them is elastically displaced in opposite directions or opposing directions toward the outside of the frame 1, as described above, thereby preventing the frame 1 from being distorted.

2) When fixing from the bottom side> The sub-frame 2 and the sub-frame 3, to which the frame l is pivotally attached from both sides, are fixed using a plurality of fixing screws 2b, 3b as described above.
The frame 1 is highly rigid in the screw tightening direction and has almost no elastic deformation, but as mentioned above, the frame 1 has elasticity when tightening, and the screws 9a and screws are connected to the subframe 2 and the subframe 3. 9 can be torsionally displaced, and for example, the surface facing the base (not shown) of a device including a recording/reproducing device has a relative misalignment, and a plurality of fixing screws can be twisted. 2b.

Even if the screws 3b are tightened individually, distortion will only occur locally in the part where the frame l is connected to the subframe 3 by screws 9, and distortion will be suppressed in the part where the recording/playback element function is installed. has been done.

On the other hand, as mentioned above, the frame l and one screw 9a each
The sub-frame 2 and the sub-frame 3, which are connected by the screws 9 and 9, are configured so that when external stress is applied, a relative conforming action occurs in the circumferential direction around the screws 9a and the screws 9, for example. If there is a relative misalignment in the surface facing the base (not shown) of the device, etc. that includes the recording/reproducing device, even if the plurality of fixing screws 2b and 3b are tightened individually, the elemental functions of recording and reproducing will not work. The occurrence of distortion in the frame 1 equipped with this is further suppressed.

As mentioned above, in both cases of fixing from both sides in the lateral direction and fixing from the bottom, the frame 1 on which the recording/reproducing element a111 is attached is floating on the sub-frames 2 and 3. It is pivotally mounted to prevent distortion of the main parts.

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

As mentioned above, frame 1 is equipped with the recording and reproducing element a function.
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, 3b. Even if it is fixed by tightening each screw, it is not essentially fixed, in other words, it is in a floating state, and (in terms of numbers), for example, if it is dropped or violently vibrated. , when encountering a disturbance such as an impact, the frame l will fall into an intense resonance state or become misaligned in the system formed by the relationship between the subframes 2 and 3, but the protrusion 1a of the frame l and The engagement hole 2c of the subframe 2 is engaged with the required clearance,
It 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 l within a clearance amount range, and the clearance amount is set. For example, when there is a relative misalignment in the surface facing the base (not shown) of a VT stand that includes a recording and reproducing device, when the plurality of fixing screws 2b and 3b are tightened, the frame 1 Distortion that occurred locally in subframe 2 and subframe 3
Due to the respective screws 9a that connect the frame 1 and the relative fitting action in the circumferential direction around the screws 9, a required clearance is set so that the protrusion 1a of the frame 1 and the engagement hole 2c of the sub-frame 2 do not come into contact with each other. Just do it.

In the recording/reproducing IIt system configured as described above, the basic rigidity is taken care of by the sub-frame 2 and the sub-frame 3, and the sub-frame 2 and the sub-frame 3 support the frame 1 equipped with the recording/reproducing element 1 function. , so to speak, is configured to be pivoted in a floating state, and is intended to suppress the occurrence of distortion in the main part equipped with the element function of recording and reproduction.In other words, frame 1 is only equipped with the element a function of recording and reproduction. However, it is not related to the basic structure of rigidity, and may be something very simple or flexible, such as word processor laptops, which are often carried around these days. In order to meet the need to reduce the weight of a recording/reproducing device installed in a computer or the like, it is preferable to use a lightweight material such as a plastic material.

As described above, the subframe 2 and the subframe 3 are connected by screws 9a and 9 toward the substantially planar center of gravity of the frame 1 on which the recording and reproducing elements described above are mounted. Even if the frame 1 is pivotally mounted and the recording/reproducing apparatus of this embodiment is attached and encounters a disturbance such as severe vibration or shock, the frame 1 is pivotally mounted in the above-mentioned 7-quarter state. is constructed so as to maintain balance, and care has been taken to ensure that it does not adversely affect the performance of recording and reproducing elements.

In this embodiment with the above-described configuration, it has become possible to realize a plastic frame, which has traditionally been difficult to achieve due to lack of rigidity even if attempts were 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 mounted with a head 5 for transmitting and receiving signals, and is guided so as to be movable in the radial direction of the recording medium (not shown), and is freely accessible. 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. (Illustration omitted) They have an interlocking configuration. .

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

Note that, as will be described in detail later, the step motor 7 is fixed to a mounting portion 1b formed on the frame 1 via a mounting plate 7b.

By the way, as mentioned in the conventional example, 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 (referred to as a track position), and the relative position of this 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, the outer body of the step motor 7 is rotated with a required mounting preload applied to the step motor 7, and the pinion 7a configured on the rotational output shaft of the step motor 7 is
The carriage 6 is moved via a rack 6a that is applied with preload (not shown) and meshes with the disk, and the relative position of the track position of the disk (not shown) and the head 5 is adjusted to a predetermined positional relationship. After that, adjust the wR by fixing the step motor 7.

As with the conventional example, the stop position of the rotation 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 rotation output shaft also rotates. When the outer body of the step motor 7 is rotated as described above, the binion 7a formed as the rotation output shaft rotates following the rotation of the outer body of the step motor 7, and meshes with the binion 7a. The carriage 6 moves via the rack 6a to adjust the track position of the disk (not shown) and the relative position of the head 5.

In the adjustment method of this embodiment, which is performed by the above-mentioned procedure, as in the conventional example, regarding *a of the relative position between the track position of the disk (not shown) and the head 5, the outer body of the step motor 7 is adjusted. The position of the head 5 in the linear direction is adjusted by rotationally adjusting it in the circumferential direction, and fine position adjustment is possible.

In the conventional example mentioned above, the step motor is fixed by tightening the screw after the position adjustment of the relative position of the disk track position and the head is completed, and when the step motor is fixed, the step motor is not rotated slightly. Even though we have made fine positional adjustments, the relative positional relationship may be out of order due to small horizontal movements or tilting of the step motor. However, in this embodiment, this problem has been improved, and the delicate relative positional relationship between the track position and the head can be easily adjusted, and the WR alignment condition at the relative position can be adjusted. The mechanism for holding the device without any movement will be explained below based on FIGS. 2 to 5.

Figure 2 is a detailed view of the main part of Figure 1, and is a diagram of the step motor fixing structure.The right and left halves of the figure - dotted chain line 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. fJ4 is a diagram illustrating the main part of Fig. 2, and is a guide explanatory diagram of the step motor, 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 - side bearing engages with a guide hole ld formed in the frame 1 with some clearance, and also serves as a boss 7c for forming a reference for the mounting position of the step motor 7.

The step motor 7 is provided with a mounting plate 7b extending on both sides and bent into a substantially convex shape. It has an open lower lower part elj on the outside of the outer body of the step motor 7, 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 l has a reference plane IC in the axial direction of the step motor 7 and a mounting portion 1 corresponding to the mounting plate 7b.
b, and the mounting part lb has a mounting plate 7b.
The mounting plate 7b has a slightly wider slit Ig, and the mounting plate 7b engaged with the slit 1g is pressed by the pressing surface If, and has a structure in which it makes a required elastic displacement and holds the step motor 7 against the reference surface 1c.

Incidentally, in order to set the step motor 7 by engaging the mounting plate 7b with the mounting portion 1b, the step motor 7 is rotated approximately 90 degrees from the position of the mounting plate 7b shown in FIG. The boss 7c may be inserted into the hole 1d, rotated to the state shown in Figure #I3, and the attachment plate 7b may be engaged with the holding surface 1f.

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 form the required elasticity.
Alternatively, it is preferable to form a slope or the like for guiding the engagement on one of the mounting plates 7b (not shown).Next, the identification structure of the step motor 7 will be explained.

On the left side from the dashed line in Figures 2 and 3, the adhesive 16
The mounting plate 7b is fixed to the frame l by filling with the mounting plate 7b, and the mounting plate 7b mentioned above
The step motor 7 is held firmly against the reference surface lc by being pressed by the step motor 7, and has sufficient strength to hold the step 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 plate 7b
is held down by the presser 1f and undergoes the required elastic displacement, and with the step motor 7 pressed against the reference surface 1c, the screws 15 are tightened, and as shown in FIG. 2, the mounting plate 7b is further tightened slightly. It is pressed and fixed to the receiving surface 1e of the frame 1 by elastically deforming, and has sufficient strength to hold the step motor 7.

Naturally, the amount of elastic displacement of the mounting plate 7b due to the tightening of the screws 15 is small, and this displacement does not affect the performance 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 screws 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, the outer body of the step motor 7 is rotated with the required mounting preload applied to the step motor 7 described above in FIG. Granted (not shown)
Several adjustment structures for adjusting the relative position of the head 5 and the track position of a disk (not shown) to a predetermined positional relationship by moving the carriage 6 via the engaging racks 6a will be described.

First, a back plate 7d is provided on the side opposite to the mounting side of the step motor 7, and as shown in FIG. 3 (only the right half is shown in FIG. 3), the back plate 7d has A plurality of holes 7f are provided at symmetrical positions so that pin spanners, etc. can be engaged from behind the 7 (if special spanners etc. are considered, convex parts may be used instead of holes), and a standardized general It constitutes a spanner locking part consisting of at least one pair of opposing faces, indicated by L in FIG. It can be rotated by.

On the other hand, a gear 7bl is configured on the outer periphery of the mounting plate 7b, and is shown by a two-dot chain line in FIGS.
A gear jig 14 that engages with the screw hole 1h of No. 5 to form a rotation fulcrum.
The gear jig 14 is configured to mesh with the gear jig 14, and is rotatable in accordance with the rotation of the gear jig 14.

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

In FIGS. 2 and 3, the rotation 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 may also adopt it.

The details of the fixing structure and rotation adjustment structure of the step motor 7 have been explained above, but the first and 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 with and forms the reference for the mounting position of the step motor 7 will be explained based on *4fm and FIG. 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, the boss 7c, which engages with the guide hole 1d formed in the frame 1 described above and forms the 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 1j 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 any clearance.

By the way, as mentioned above, there is a boss 7C on the protrusion 1j of the guide hole 1d.
In order to insert and engage without clearance, use protrusion 1.
j or the boss 7c is deformed in some way to make the relative shapes coincide; however, in this embodiment, the boss 7c also serves as a bearing, so the protrusion 1j is shaped so as not to affect the bearing [1]. In order to actively take charge of transformation,
The protrusion 1j has a substantially triangular cross-sectional shape to facilitate deformation of its apex.

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.

The engagement structure between the guide hole 1d and the boss 7C configured as described above is such that although the boss 7C and the guide hole 1d essentially have a slight clearance, they can be combined without affecting the function. The shapes of the step motor 7 are relatively easily matched and the engagement clearance is eliminated.The step motor 7 is securely positioned in the plane direction with respect to the reference plane IC, and the rotation direction of the outer body is fixed. Other than that, there is no slight movement of even 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.

In addition, in the above-mentioned structure, the workmanship is also a fine workmanship, 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 made possible. ing.

Based on the step motor holding structure having the above configuration, the features of adjusting the relative positional relationship between the track position and the head and fixing the step motor will be explained.

1. Regarding rotation adjustment of the step motor.

As described above in FIGS. 2 and 3, the step motor 7
The mounting plate 7b that holds the step motor 7 has a structure that provides the required elasticity in the axial direction of the step motor 7 through engagement with the frame 1 as a means of applying a required mounting preload to the step motor 7. motor 7
is pressed against the reference surface 1c by the mounting preload, and is held in the rotating direction of the outer body by the engagement friction between the mounting plate 7b and the frame l.

Therefore, unlike the conventional example mentioned above, there is no problem that the rotational torque of the stepmotor varies greatly depending on the tightening condition of the screw that fixes the stepmotor, and the step motor can be adjusted to zero rotation with stable rotational torque. It is possible to make fine adjustments to the relative positional relationship between the track position of the disk (not shown) and the head 5 by adjusting the rotation of the outer body of the step motor 7. Nothing is necessary.

Note that the rotational torque of the step motor 7 is determined by a mounting plate 7b that holds the step motor 7 and has elasticity.
Although it is possible to devise the board thickness and material, it is more economical to
It is preferable to configure the required elastic force by devising the shape and size of the opening lower part e of the mounting plate 7b.

2. How to adjust the rotation of the step motor.

The features of the adjustment structure for adjusting the rotation of the outer body of the step motor 7 described above with reference to FIGS. 2 and 3 will be described below.

■ Rotation adjustment performed using a bottle spanner, etc.

A plurality of holes 7f provided at symmetrical positions in the back plate 7d of the step motor 7 are configured to be rotatably adjusted by engaging, for example, a screw spanner from behind the step motor 7. It is suitable for an automated layout that involves fine adjustment of the relative positional relationship between the track position of the disk (1! [not shown)] and the head 5, which is performed by rotating the body, and it simplifies the automation device and provides stable rotational adjustment ability. It will be done.

■, Rotation performed using a hexagon spanner! l adjustment.

A wrench engaging portion formed on the back plate 7d of the step motor 7 and consisting of at least one pair of opposing faces indicated by L in FIG. For fine adjustment of the relative positional relationship between the track position of the disk (not shown) and the head 5, rotational movement can be achieved by using a long arm such as a square spanner. As the amount increases, the resolution of the rotational adjustment is improved, and even when the rotational adjustment is performed manually, for example, no special skills are required and stable rotational adjustment is possible.

■ Rotational adjustment performed using a gear jig.

A gear 7bl configured on the outer periphery of the mounting plate 7b engages with the screw hole 1h of the screw 15 to form a rotation fulcrum of the gear jig 1.
4 are engaged with each other so as to be rotatably adjustable, and is suitable for an automated layout relating to fine adjustment of the relative positional relationship between the track position of the disk (not shown) and the head 5 mentioned above.

That is, since the gear holder 14-14 is configured with its rotation fulcrum engaged with the screw hole 1h, the accuracy of the automation device may be poor, or the gear 7bl formed on the outer periphery of the automation device and the mounting plate 7b may be damaged. Even if a positional shift or the like occurs, once a part of the gear jig 14 is engaged with the screw hole 1h, the mutual positions will fall into the desired relationship, so the automation device can be simplified.

Further, by devising the gear ratio between the gear 7bl and the gear jig 14, it is easy to increase the amount of rotation of the gear jig 14, improving the resolution of rotation adjustment and making stable rotation adjustment possible.

Although this adjustment structure has been explained using an automated device as an example, it goes without saying that the same effect can be achieved when manually adjusting the rotation, and it does not require any special skills and is stable. Rotation adjustment is possible.

3. Regarding adhesive fixing of the step motor.

As described above in FIGS. 2 and 3, the step motor 7
The mounting plate 7b holding the frame 1 forms the required elasticity in the axial direction of the step motor 7 by engagement with the frame l, and is filled with adhesive 16 to provide the required elasticity in the axial direction of the step motor 7. Therefore, as in the conventional example described above, after the position adjustment is completed, the step motor 7 is held by a fixing means such as a screw. There are no problems such as the motor 7 rotating slightly in the circumferential direction, moving slightly in a plane with respect to the attachment part, or tilting with respect to the attachment part.

In other words, the step motor 7 is fixed without applying any external force when the minute position adjustment of the relative positional relationship between the track position of the disk (not shown) and the head 5 has been completed, so that the adjusted state is not disturbed. This allows for easy configuration of precise relative positional relationships.

This embodiment is based on the idea that after the position and Jl adjustment is completed, the step motor 7 is fixed without applying any external force to the step motor 7 using a fixing means such as a screw, thereby preventing deviations that occur when the adjustment is completed. For example, even if the structure is similar to the conventional example described above, it is possible to slightly tighten the screws that secure the step motor and apply a slight frictional force in the direction of rotation of the step motor, and then remove the outer body of the step motor. You can adjust the position by rotating it, and without tightening the screw in this state, you can glue and fix the step motor together with the screw, or you can move the step motor parallel to the direction of movement of the head, although illustrations and explanations are omitted. Even with a well-known adjustment structure that adjusts the relative position of the disk track position and the head, it is possible to maintain the position adjustment without applying external force to the step motor using fixing means such as screws. Even if it is fixed with adhesive, it exhibits the same functions and characteristics.

Of course, it is also effective to fix the step motor with adhesive without applying external force, and then fix it even more firmly with fixing means such as screws after this adhesive fixation, and this can also be applied to the above-mentioned cylindrical configuration. .

4. Regarding screw fixation of the step motor.

As described above in FIGS. 2 and 3, the step motor 7
The mounting plate 7b holding the frame 1 undergoes a required elastic deformation due to engagement with the frame 1, and with the required mounting preload applied to the step motor 7 by the elastic force, the mounting plate 7b is further slightly deformed by tightening the screw 15. The structure is such that the step motor 7 is elastically deformed by a certain amount, and is pressed and fixed against the receiving surface 1e of the frame l to hold the step motor 7. As with the conventional example, the circumference of the mounting plate 7b when tightening the screws is Although slight rotation in this direction is unavoidable, consideration has been taken to keep the screw 15 away from the center of the stepper 7 to minimize its influence.

On the other hand, the seek structure of the carriage in this embodiment is configured by a combination of a rack and a pinion, and if the step motor 7 is tilted, the disc (not shown)
This appears as a positional deviation between the track position and the relative position of the head 5, and in particular, the amount of inclination that occurs in the moving direction of the carriage 6 directly appears as a positional deviation in the relative positional relationship.

Regarding the inclination that occurs in this step motor 7,
For example, even if there is a slight relative unevenness between the receiving surface 1e or reference surface 1c of the frame 1 and the mounting plate 7b, the screw 1
5 may cause the step motor 7 to tilt due to an imbalance in the tightening order or tightening strength. The structure is such that the required elasticity is created in the axial direction of the step motor 7 by engagement with the screw 1, and the step motor 7 is held with a required preload.
Even if there is an imbalance in the tightening strength of 5 or a difference in the tightening order, the distortion will be absorbed by the elastic structure of the mounting plate 7b, and the step motor 7 will not be tilted, and the function of the step motor 7 will be improved. It does not affect position accuracy, etc.

By the way, if we pay attention to the shape of the mounting plate 7b shown in FIGS. 2 and 3 and described above, the mounting plate 7b extends on both sides of the step motor 7 and is bent in a substantially convex shape, so that it can be elastically displaced. However, this approximately convex shape is not formed for the purpose of elastic displacement, and in this embodiment, as described above, the technology of constructing the frame 1 from a plastic material is put into practical use, and the One way to ensure the effective screw length of the plastic frame and prevent screw tightening creep is to form the plastic frame into a substantially convex bent shape.

5. Step motor installation position Regarding the standard configuration.

As shown in FIGS. 4 and 5 and described above, the detailed structure in which the boss 7C engages with the guide hole 1d formed in the frame 1 to form a reference for the mounting position of the step motor 7 will be described. Although the guide holes 1d are essentially engaged with each other with some clearance, as a means for removing the engagement clearance,
A protrusion 1j is arranged in the guide hole 1d so as to form an inscribed circle slightly smaller than the outer diameter of the boss 7c.The boss 7C is inserted into the protrusion H1j of the guide hole ld, and some kind of The deformation is caused to match the relative shape with the boss 7C,
The boss 7C inserted into the guide hole 1d is supported by the projection 1j without creating any clearance.

That is, the step motor 7 is supported by the frame 1 without any clearance due to the engagement between the guide hole 1d and the boss 7c, and its position in the plane direction with respect to the reference surface 1c is firmly secured, so that the outer body It constitutes the reference for the mounting position in a state where there is no slight movement of only a few micrometers in any direction other than the direction of rotation.

What should be noted here is that the step motor 7, whose details are shown in FIGS. 2 and 3, is formed approximately symmetrically with respect to the rotating shaft, so that the weight balance is stable.
For example, even if it encounters a disturbance such as severe vibration or impact, it will not rotate due to its own energy, so the step motor 7 is referenced by the required mounting preload constituted by the mounting plate 7b that holds the step motor 7 mentioned above. Surface 1c
There is a mounting plate 7 in the direction of rotation of the outer body.
This is implemented in combination with a structure in which the frame 1 is held by the engagement friction force between the frame 1 and the step motor 7, so that even if the mounting preload force is encountered, for example, a disturbance such as severe vibration or impact, the step motor 7 will bounce with its own energy. If the desired mounting preload force is set to a desired value, it is not necessary to use fixing means such as fixing the step motor 7 with adhesive as described in 3. or fixing the step motor 7 with screws as described in 4.

By the way, in the specific example of this embodiment, the step motor 7
The weight of is 25g, the installation preload force is set to 3Kg,
The rotational torque of the step motor 7 is 2.5 Kg-Cm, which is a desirable value from a mass-production standpoint, and the step motor 7 can be put to practical use without the need for fixing means such as adhesive fixing or screw fixing. .

As mentioned above, in order to insert the boss 7c into the projection 1j of the guide hole 1d and engage it without any clearance, the projection 1j or the boss 7C must be deformed in some way to match their relative shapes. In the embodiment, in order for the protrusion 1j to actively take charge of the deformation, the cross-sectional shape of the protrusion H1j is configured to have a substantially triangular shape, making it easy to deform the apex without affecting the bearing function etc. , the insertion force when inserting the boss 7C and deforming the protrusion 1j is also reduced.

In addition, as a means for easily guiding the insertion of the boss 7C into the guide hole 1d, a protrusion Nlj is formed from the middle of the guide hole 1d, and a slope 1jl is formed on the protrusion 1j. The protrusion 1j is guided into the guide hole 1d with a clearance of

6. Gluing and fixing the step motor Regarding the combined use of screw fixation.

The adhesive fixing structure of the step motor mentioned above in 3. makes it extremely easy for producers to take advantage of its fixing function, for example, by automating the fixing, and allows for highly efficient and stable fixing. On the market side, for example, when the relative positional relationship between the track position of the disk (not shown) and the head 5 needs to be readjusted for after-sales service, etc., adhesive supply, adhesive quality control, and adhesive work training are required. etc., resulting in an extremely undesirable fixing structure.

Therefore, in this embodiment, 3. The adhesive fixing strength of the step motor mentioned above and 4. It is possible to use the above-mentioned screw fixing structure of the step motor in combination, and the market side can, for example, provide after-sales service or exceptionally readjust the relative position between the track position of the disk (not shown) and the head 5. In such a case, if the step motor is fixed with a screw after the adjustment, the troublesome phenomenon described above can be avoided and the objective can be easily achieved.

By the way, when readjusting the -H step motor after adhesively fixing it as described above, the problem would be how to peel off the adhesively fixed step motor, but this example As mentioned above, the step motor 7 does not rotate due to its own energy even if it encounters disturbances such as severe vibrations or shocks, so its adhesive fixing strength may be extremely weak. ．． Based on the adjustment structure for adjusting the rotation of the outer body of the step motor 7 described above, it is possible to easily peel off by applying rotational torque to the step motor 7. Preferably, the standardized general It is best to apply rotational torque using a hexagon spanner or the like to peel off the film.

In addition, when using both the adhesive fixing structure (producer side) and the screw fixing structure (market side) of the step motor as described above, please be sure to Although screws may or may not be present, it is preferable to ship them without attachments and procure them from the market without inconvenience at all when it comes to procuring screws and the like.

As described above, the embodiments of the present invention have a number of features, including: 1. ~6. Although some of the items described above are shown overlappingly in Figures 2 and 3, they are independent and may be implemented overlappingly.
Although it may be carried out independently, it is preferable to carry out 5. The above-mentioned step motor 7 is supported by the frame 1 without any clearance, and its position in the plane direction with respect to the reference surface 1c is firmly secured, and there is no slight movement of even a few μm in any direction other than the direction of rotation of the outer body. If each item is implemented in combination with one means for configuring the reference for the mounting position, its characteristics will be further exhibited.

Although this embodiment has been described with a structure in which the step motor 7 is directly attached to the frame 1, it goes without saying that even if a separate member is arranged and attached as a bracket for the step motor 7, each of the above-mentioned components can be attached to the bracket. It goes without saying that similar features can be obtained by implementing the technical content of .

Next, an application example of the present invention 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 boss 17c of the step motor 17 and the frame 11 engage with each other to form a reference for the mounting position.

The step motor 17 is provided with flat mounting plates 17b extending on both sides, and the mounting plates 17b
is configured as a part of the frame 11 and the step motor 1
Attachment part 11b that can configure required elasticity in the axial direction of 7.
It is configured to be pressed against the reference surface 11c in the axial direction of the step motor 17, and to hold the step motor 17 with a required mounting preload applied thereto.

To set the step motor 17 by engaging the mounting plate 17b with the mounting portion 11b, move the step motor 17 approximately 90 degrees from the position of the mounting plate 17b in FIG.
Insert the boss 17c into the frame 11 in a rotated position,
It has a structure in which the mounting portion 11b and the mounting plate 17b are engaged with each other by rotating the mounting portion 11b to the state shown in FIG.

What makes this application example with the above configuration different from the embodiment described above in FIGS. 2 and 3 is the means for applying a required mounting preload to the step motor 17. Although the plate 7b has an elastic function,
In this application example, although the mounting plate 17b also has a slight elastic function, the mounting part 11b of the frame 11 is actively configured with an elastic function, and as described above, the technology of constructing the frame 11 from a plastic material is put into practical use. At this stage, 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 the fixing means using screws etc. 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 1M 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 (1!I
(not shown) The freely accessible carriage 26 is equipped with a needle-shaped lead pin 26a, and the lead pin 26a applies preload to a lead screw 27a, which is a rotating output shaft of a step motor 27 mounted on the frame l. The carriage 26 is configured to be attached (not shown) and screwed together, and the carriage 26 is driven to access by the movement of the step motor 27.

Then, 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 as in the conventional example, and the rotary output shaft of the step motor 27 is rotated. A preload is applied to the configured lead screw 27a (not shown).
This is a procedure in which the carriage 26 is moved via the threaded dowel 26a, and the track position of the disk (not shown) and the relative position of the rad 5 are adjusted to a predetermined positional relationship.

In the conventional example described above, the step motor is fixed by tightening the screw after the position adjustment of the relative position between the track position of the disk and the head is completed, and it takes a lot of effort to fix the step motor by tightening the screw.
Despite making detailed position adjustments, errors occurred in the relative positional relationship, making it difficult to configure a precise relative positional relationship, but this application example has improved this point, and the track position Regarding the mechanism for easily adjusting the delicate relative positional relationship between the head and the head, and for maintaining the adjusted state of the relative position without causing any deviation, see Figures 2 to 5 and Figures 6 and 7. All the content described above based on the figures can be applied.

The seek structure of the carriage in this application example shown in Fig. 8 is composed of a combination of a lead screw and a lead pin, 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 a capstan in an α-shape, and both ends of the belt are connected to a carriage. In this structure, a step motor is also used to adjust the relative position of the disk track position and the head. In the configuration in which the rotation is performed, all the contents described above based on FIGS. 2 to 5 and FIGS. 6 and 7 can be similarly applied.

[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, the recording and reproducing apparatus of the present invention can perform recording and reproducing on a disk. A step of moving and driving a carriage carrying a head for carrying out the process, attaching an outer body so as to be rotatable by a predetermined angle, and rotating the outer body to adjust the relative positional relationship between the predetermined track position of the disk and the head. A mounting part that can be elastically displaced in the axial direction is arranged on a part of the outer body of the motor, and a reference surface in the axial direction and a receiving part that receives elastic displacement of the mounting part are provided on the mounting side of the step motor. The structure is such that the step motor is fixed by shifting the mounting part to apply an axial mounting preload, and by pressing the mounting part with a screw. The step motor is fixed by elastically deforming until it comes into contact with the step motor, and the elastic deformation of this mounting part absorbs the relative unevenness between the axial reference surface and the step motor and the stress caused by screw tightening, and fixes the step motor. There is no tilting or positional deviation, and there is no change in the fixed state when adjusting the rotation of the outer body and when the rotation adjustment is completed, making it possible to perform stable adjustment and fixation even with delicate rotation adjustments. Therefore, when making fine positional adjustments to the relative position between the disk track position and the head, the step motor can be rotated to adjust the position, and the position can be fixed without disturbing the completed position adjustment. , it becomes possible to easily adjust the precise relative positional relationship,
With the increase in speed and capacity of computers, etc., the recording capacity has expanded dramatically, and the recording and reproduction density has become even higher, making it possible to maintain the relative positional relationship between the track position of the disk and the head with a deviation of only a few μm or less. This makes it easy to make delicate relative position adjustments in recording and reproducing devices, which have become necessary in recent years, and enables stable mass production of recording and reproducing devices with high track density. The effect is extremely large.

[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. Figure 1 is an exploded perspective view of the recording and reproducing device, and Figure 2 is a detailed view of the main parts of Figure 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. 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. FIG. 9 and FIG. 1O are diagrams explaining the conventional technology,
FIG. 9 is a side view of a conventional recording/reproducing device. FIG. 10 is a partial rear view of FIG. 9. 1,,,,. lb... lc,,,. ld,,,. lj,,,. 6. 6a... 7. 7a... 7b... 7c... 15. 16,,,,. Frame mounting part reference surface guide hole protrusion carriage rack step motor binion mounting plate boss screw adhesive Fig. Fig. Fig. Fig.

Claims (1)

[Claims] The outer body of a step motor for moving and driving a carriage mounted with a head for recording and reproducing information on a disk is attached so as to be rotatable by a predetermined angle, and the outer body of the step motor is rotated to In a recording and reproducing device that adjusts the relative positional relationship between a predetermined track position of a disk and the head, a mounting portion that can be elastically displaced in the axial direction is disposed on a part of the outer body of the step motor, and the step motor A reference plane in the axial direction and a receiving part for receiving elastic displacement of the mounting part are provided on the mounting side of the mounting part, and the mounting part is displaced to apply mounting preload in the axial direction, and the mounting part is pressed with a screw. A recording/reproducing device characterized by having a structure in which a step motor is fixed.