JPH0229977A - Recording and reproducing device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

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.

Fig. 9 is a side view of a conventional recording/reproducing device, and Fig. 10 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 according to the movement 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 adjust to a predetermined positional relationship.

Therefore, in the conventional examples shown in FIGS. 9 and 10, the relative position of the track position and the head is 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 carriage 35 is moved, and the track position of the disk 31 and the relative position of the head 37 are adjusted to a predetermined position W, I'Sll. After this adjustment, the screw 41 is firmly tightened to turn the step motor 42. I was adjusting it using the procedure of fixing it.

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 head 37 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. It adjusts the position in the am direction, and basically allows fine position adjustment, but depending on the tightening of the screw 41,
Since the frictional force between the screw 41 and the mounting hole 42a of the step motor 42 changes greatly, when adjusting the relative positional relationship between the track position of the disk 31 and the head 37 by rotating the outer body of the step motor 42, The variation in rotational torque was large, requiring delicate rotational adjustment skills.

Also, when the step motor 42 is fixed by firmly tightening the screw 41 after this position adjustment is completed, the screw 4
1 flange part and the mounting hole 42a of the step motor 42! ! Rubbing may cause the step motor 42 to rotate slightly in the circumferential direction, to make small movements in a plane relative to the mounting part, or to cause even slight unevenness in the mounting surface of the step motor 42 relative to the mounting part. If so, the step motor 42 may be tilted due to the tightening of the plurality of screws 41.

In other words, the track position of the disk 31 and the head 37
Even if the fine adjustment of the relative position of
When fixing the step motor 42 by tightening step 1, if the step motor 42 causes slight rotation or slight movement in a plane, or if the step motor 42 tilts, it may occur that even though the step motor 42 has been made a minute position adjustment, First, 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.
J1 strength in the rotation direction of the step motor 42! Rotating the outer body of the step motor 42 while applying frictional force,
If the step motor 42 is fixed by slightly retightening the screw 41 after the fine position adjustment is completed, it is an effective means to suppress the above-mentioned deviation in the relative positional relationship between the track position and the head 37. In this case, a large rotational force is required to adjust the rotation of the step motor 42, or the mounting part of the step motor 42 may be deformed, resulting in poor adjustment efficiency or the precision relative positional relationship. There was a female in the composition.

[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 fine position adjustments, and after this position adjustment is completed, the step motor is fixed by tightening the screws. The relative positional relationship between the disk track position and the head may be out of alignment due to slight movement in the mounting area, or the step motor is tilted, even though the position has been carefully adjusted. I ended up putting it away.

In addition, when the outer body of the step motor is rotated with a strong frictional force applied to the rotational direction of the step motor to perform fine position i; IJ adjustment, the rotation of the step motor v4
Adjustment requires a large turning force, deforms the mounting part of the step motor, resulting in poor 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 easily adjust the delicate relative positional relationship between the track position and the head using a simple structure. The purpose of the present invention is to provide a mechanism that maintains the adjusted state of relative positions without causing any deviation, thereby facilitating stable mass production even for high track density recording/reproducing devices.

[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 and reproducing apparatus that adjusts the relative positional relationship between a predetermined track position of the disk and the head by rotating an outer body of the motor, the step motor has a boss coaxial with a rotary output shaft and a boss of the outer body. It is equipped with a plurality of mounting members protruding in the outer circumferential direction, and on the mounting side of the step motor, a guide hole is provided on a reference surface perpendicular to the axial direction of the step motor and engages with the boss to form a mounting position reference. , a plurality of attachment parts are disposed facing the reference surface and are engageable in correspondence with the attachment members, and the guide is arranged in a state where the attachment members and the attachment parts face each other in a plane. The boss is engaged with the hole to set the mounting position, and the outer body of the step motor is rotated to engage the mounting member with the mounting portion to create a resilient force, and the resilient force causes the step to be completed. Features characterized by having a structure that holds a motor [Function] According to the above structure of the present invention, the carriage mounted with the head for recording and reproducing on the disk is moved and driven, and the outer body is rotated by a predetermined angle. A step motor that is movably attached and rotates the outer body to adjust the relative positional relationship between a predetermined track position of the disk and the head includes a boss coaxial with the rotational output shaft and a plurality of mounting members. On the mounting side of the step motor, a guide hole is formed on a reference surface, and a plurality of mounting portions are arranged facing the reference surface and can be engaged with the mounting members in correspondence with the mounting members. Set the mounting position of the step motor by engaging the boss in the guide hole with the sides facing each other in a flat manner, and rotate the outer body to engage the mounting member with the mounting part to create elastic force. However, the step motor has a structure that is held by the elastic force, so it is easy to combine both, and there is no change in the holding state when adjusting the rotation of the outer body and when the rotation adjustment is completed, so there is no slight change in the holding state. Stable adjustment and holding is possible even when adjusting the rotation.

[Embodiment] FIGS. 1 to 5 show the most suitable embodiment of the recording/reproducing apparatus of the present invention, and the sixth rl! i and FIG. 7 show an example of its application, and 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
11! i is a front view of FIG. 2, and is a front view of the step motor fixed; FIG. 4 is a diagram illustrating the main parts of FIG. 2;
FIG. 5 is a cross-sectional view of the main part of FIG. 4, and is a diagram of the guide structure of the step motor.

In FIG. 1, a frame 1 for mounting recording/reproducing elements M functions as a main shaft motor 4 serving as a rotary drive means for chucking and rotationally driving a disc-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 10.

On both sides of the frame 1, a sub-frame 2 and a sub-frame 3 are arranged on both opposing sides of the frame 1 so as to form two opposite sides facing outside of the frame 1. The frame 2 and the sub-frame 3 have a plurality of fixing screws on opposite sides 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. 2a and 3a, each forming a surface that is substantially perpendicular to the outwardly opposing surface of the frame 1, and a plurality of fixing screws 2b and 3b are similarly formed on this surface, respectively.

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, which is equipped with the above-mentioned recording/reproducing element functions, and the frame 1 is pivoted. are doing.

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. is maintained and engaged.

In addition, the sub-frame 2 and the sub-frame 3, which are connected to the frame l by one screw 9a and one screw 9, respectively, 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 screw and the external stress are compatible with each other, and due to this relative matching effect in the circumferential direction, the relative position in the circumferential direction with respect to the frame l equipped with the recording and reproducing element functions is determined. , the engagement hole 2C of the subframe 2 and the protrusion B of the frame l
It is adaptable within the required clearance constituted by 1a.

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 and having the same dimensions on the outside of the sub-frame 3 is inserted and assembled from the direction of the rear arrow 11 in the figure.

The case 8 has the role of covering and protecting the above-mentioned recording/reproducing element functions.

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

3b.For example, when fixing the recording/reproducing device to a base (not shown) of a device that is assembled together, 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 device of this embodiment with the above configuration to the base (not shown) of a device including the recording/reproducing device, for example, 1) When fixing from both sides in the lateral direction> As described above. The subframes 2 and 3, which are pivotally attached to the frame l from both sides, can be used even if there is a relative misalignment in the surface facing the base (not shown) of a device including a recording/reproducing device, for example. When the fixing screws 2a and 3a are tightened, they are elastically displaced in opposing 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 1 is pivotally attached from both sides, have a plurality of fixing screws 2b, 3b as described above.
The structure is highly rigid in the direction of tightening the screws, so that there is almost no elastic deformation. However, as mentioned above, the frame l has some elasticity, and the screws 9a and screws The plurality of fixing screws 2b are capable of torsional displacement at the portions connected by the screws 9, and have a relative misalignment on a surface facing a base (not shown) of a device including, for example, a recording/reproducing device.

Even if the screws 3b are tightened individually, distortion will only occur locally in the part where frame 1 is connected to subframe 3 by screw 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 1 and each one screw 9a
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. A relative misalignment has occurred on the surface facing the base (Ilffl not shown) of the device, etc. including the recording/reproducing device, and the plurality of fixing screws 2b,
Even if the screws 3b are tightened individually, the occurrence of distortion in the frame l equipped with the X function required for recording and reproduction 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 equipped with the recording and playback element functions 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 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 W1 strike, the system formed by the relationship between the subframe 2 and the subframe 3 causes a strong resonance or misalignment, but the protrusion 1a of the frame 1 The engagement holes 2c of the subframe 2 that are engaged with each other with a required clearance have the role of regulating this vibration to a predetermined amplitude and suppressing severe resonance phenomena. It constitutes a displacement regulating means that regulates positional deviation within a clearance amount range, and the clearance amount is set relative to a surface facing a base (not shown) of a device including a recording/reproducing device, for example. When the plurality of fixing screws 2b and 3b are tightened, the local distortion of the frame 1 and the sub-frame 2 and sub-frame 3 may be caused by some misalignment.
Due to the respective screws 9a connecting 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 and reproducing device configured as described above, the basic rigidity is provided by the subframe 2 and the subframe 3, and the subframe 2 and the subframe 3 provide the frame l equipped with the element functions of recording and reproducing. , 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 elemental function of recording and reproduction.In other words, the frame l is equipped with only the elemental function of recording and reproduction. However, it does not have anything to do with the basic rigidity of the structure, and it can be quite simple or flexible, such as word processors, laptop computers, etc., which are often carried around these days. In order to meet the need to reduce the weight of a recording/reproducing device mounted on a device, etc., it is preferable to use a lightweight material such as a 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 l, which is equipped with the above-mentioned recording and reproducing element functions, so that the frame 1 is Even if the frame 1 is pivotally mounted and encounters a disturbance such as severe vibration or shock while the recording/reproducing device of this embodiment is attached, the frame 1, which is pivotally mounted in a floating state as described above, can maintain its balance. The recording and reproducing elements are constructed in such a manner that they do not adversely affect the performance of the recording and reproducing elements.

In this embodiment with the above-described configuration, it has become possible to realize a plastic frame, which has conventionally 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 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 a frame l. (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 head that performs recording and reproduction must be adjusted to a predetermined positional relationship v4.

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, with a required mounting preload applied to the step motor 7, the outer body of the step motor 7 is rotated, and the pinion 7a configured on the rotation output shaft of the step motor 7 is rotated.
The carriage 6 is moved via a rack 6a that is applied with preload (not shown) and meshes with the rack 6a, 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 by fixing the step motor 7.

As with the conventional example, the stop position of the step motor's rotational output shaft is determined by the positional relationship formed by 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 described above, the pinion 7a configured as the rotation output shaft rotates following the rotation of the outer body of the step motor 7, and the rack engaged with the pinion 7a rotates. The carriage 6 is moved via the carriage 6a, and the relative position of the head 5 and the track position of the disk (not shown) is adjusted.

The adjustment method of this embodiment, which is performed using the steps described above, is similar to the conventional example in that the adjustment of the relative positional relationship between the track position of the disk (not shown) and the head 5 is performed by moving the outer body of the step motor 7 around the circumference. The position of the head 5 in the linear direction is adjusted by rotationally adjusting the head 5 in this direction, and fine position adjustment is possible.

In the conventional example described above, the step motor is fixed by tightening the screw after the position FJ adjustment of the relative position of the disk track position and the head is completed, and when the step motor is fixed, a slight rotation is applied to the step motor. Even though we have made minute position adjustments, the relative positional relationship may be out of order due to movement, fine planar movement, or tilting of the step motor. However, in this embodiment, this point has been improved, and the delicate relative positional relationship between the track position and the head can be easily adjusted, and the adjustment state of 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 parts of Figure 1, and is a diagram of the step motor fixing structure.The right and left halves of Figure 1 - the 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. 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 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 negative bearing engages with a guide hole 1d 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 e 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 1 has an axial reference surface 1c of the step motor 7 and a mounting portion 1 corresponding to the mounting plate 7b.
b, and the mounting portion 1b has a mounting plate 7b.
The mounting plate 7b has a slightly wider slit 1g, and the mounting plate 7b engaged with the slit 1g is pressed by the pressing surface 1f and undergoes a required elastic displacement to press the step motor 7 onto the reference plane IC.

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 post 7C is inserted into the hole 1d, rotated to the state shown in FIG. 3, and the mounting plate 7b is 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 provide the required elasticity, so that either the holding surface 1f or the mounting plate 7b It is preferable to form a slope or the like to guide the engagement (not shown).Next, the fixing structure of the step motor 7 will be explained.

On the left side from the dashed-dotted line in FIGS. 2 and 3, the adhesive 16
By filling, the mounting plate 7b is fixed to the frame l, and the mounting plate 7b mentioned above
The stepper motor 7 is held firmly against the reference surface IC by being pressed by the reference surface IC, 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 plate 7b
is pressed by the holding surface 1f and undergoes the required elastic displacement, and with the step motor 7 pressed against the reference surface IC, the screws 15 are tightened, and as shown in Figure 2, the mounting plate 7b is further slightly tightened by tightening the screws 15. 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 caused by tightening the screws 15 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 and fine soil may be combined.

Next, the outer body of the step motor 7 is rotated with a required mounting preload applied to the step motor 7 described above in FIG. (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 the 31st! As shown in I (only the right half is shown in FIG. 3), the back plate 7d has a plurality of holes 7f ( If special spanners, etc. are considered, it may be a convex part instead of a hole).
It constitutes a wrench engaging portion consisting of at least one pair of opposing faces shown in FIG. It can be rotated by turning a spanner.

On the other side, there is a 7-bit gear on the outer periphery of the mounting plate 7b.
- A gear jig 1 constructed as shown by the two-dot chain line in FIGS.
4, and is rotatable in accordance with the rotation of the gear jig 14.

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 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 next more important structure is the guide hole 1d and the post 7 formed in the frame l mentioned above.
The detailed structure of the stepper motor 7 that is engaged with the stepper motor 7 and serves as a reference for the mounting position of the step motor 7 will be described with reference to 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, the boss 7c, which engages with the guide hole 1d formed in the frame 1 described above and constitutes a reference for the mounting position of the step motor 7, is indicated by a two-point tfi 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 creating any clearance.

By the way, as mentioned above, the boss 7c is attached to 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 match, but in this embodiment, the boss 7c also serves as a bearing, so the projection lj is shaped so as not to affect the function of the bearing. In order for Uke to actively transform,
The protrusion IJ 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 match relatively easily and engagement clearance is eliminated, and the step motor 7 is securely positioned in the plane direction with respect to the reference plane IC, so that it can be moved in any direction other than the direction of rotation of the outer body. 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.

In addition, in the above configuration, the workmanship is also rjI$
1 [Although it takes a lot of work, in this example, as mentioned above, we have established the technology to construct the frame l from a plastic member.
This makes fine work easily possible.

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 the rotation WR adjustment of the step motor.

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

Therefore, there is no problem that the rotation torque of the step motor varies greatly depending on the tightness of the screws that fix the step motor as in the conventional example described above, and the rotation of the step motor 7 can be performed with stable rotation torque. Adjustment is possible, and fine adjustment of 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 is easy, and delicate rotation adjustment skills are not required. 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.

Figures 2 and 31! The features of the adjustment structure for rotationally adjusting the outer body of the step king 7 mentioned above in Section 1 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 adjustable by engaging, for example, a pin 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 a disk (not shown) and the head 5, which is performed by rotationally adjusting the body, and it is possible to simplify the automation device and obtain stable rotational adjustment ability.

■ Rotation adjustment performed using a square spanner, etc.

A wrench locking portion consisting of at least one pair of opposing faces, shown as 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 jig 14 is constructed with its rotational fulcrum engaged with the screw hole 1h, for example, the accuracy of the automation device may be poor, or the position of the automation device and the gear 7bl formed on the outer periphery of the mounting plate 7b may be affected. Even if there is a misalignment or the like, when a part of the gear jig 14 is engaged with the screw hole 1h, the positions of the gear jig 14 and the gear jig 14 will be in the desired relationship, thereby simplifying the automation device.

In addition, 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 M-ability of rotation adjustment and making stable rotation adjustment possible. Become.

In addition, this tone! The li structure has been explained using an automated device as an example, but it goes without saying that the same effect can be achieved even when rotation adjustment is performed manually, and stable rotation adjustment is possible without the need for special skills. becomes 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 fixed by filling with adhesive 16 while applying the required mounting preload to the step motor 7. It has a structure in which the step motor 7 is held in place, and does not include any fixing means such as screws.

Therefore, as in the conventional example described above, after the position adjustment is completed, the step motor 7 can be rotated slightly in the circumferential direction by means of fixing means such as screws, or can be slightly moved in a plane relative to the mounting part. There are no problems with it leaning against certain parts.

In other words, the step motor 7 is fixed without applying any external force after fine position adjustment of the relative position between the track position of the disk (not shown) and the head 5 has been completed, so that the adjusted state is maintained without being disturbed. This makes it easy to configure precise relative positional relationships.

This embodiment is based on the idea that after the position 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, the step motor can be removed by lightly tightening the screws that secure the step motor and applying a slight frictional force in the direction of rotation of the step motor. Adjust the position by rotating the body, and without tightening the screw in this state, glue the step motor together with the screw, or move the step motor parallel to the direction of movement of the head, although illustrations and explanations are omitted. At the very least, even with a well-known adjustment structure that adjusts the relative positional relationship between the track position of the disk and the head, it is necessary to apply an external force to the step motor using a fixing means such as a screw while the position adjustment is completed. Even if it is glued and fixed without any problems, the same a t4F
A. It is something that exhibits its characteristics.

Naturally, it is also effective to adhesively fix the step motor without applying any external force, and after this adhesively fixing, to further securely fix it using fixing means such as screws, and this can be applied to any of the above configurations.

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 due to the elastic force, a slight amount of additional force is applied by tightening the screw 15. It undergoes elastic deformation and is pressed and fixed to the receiving surface 1e of the frame l,
It has a structure that holds the step motor 7, and as with the conventional example, when tightening the screws, slight rotation of the mounting plate 7b in the circumferential direction is unavoidable. We are minimizing the impact by keeping it far away from the center.

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 in the relative positional relationship between the track position of the head 5 and 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, at this time, the convex shape is not formed for the purpose of elastic displacement, and in this example, as described above, the technology of constructing the frame l from a plastic material is put into practical use, and the plastic material is As a means of securing the effective screw length of the frame and preventing screw tightening creep, the frame is formed 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 explained. Although the guide holes 1d are essentially engaged with each other with some clearance, as a means for removing the engagement clearance,
A projection 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 projection 1j of the guide hole 1d, and some kind of causing the deformation to match the relative shape with the boss 7c,
When the boss 7c is inserted into the guide hole 1d, the boss 7c is supported by the projection 1j without creating any clearance.

That is, the step motor 7 can be moved into the frame 1 without creating any clearance by the engagement between the guide hole 1d and the boss 7C.
The support is supported, and its position in the plane direction with respect to the reference surface 1c is firmly secured, and there is no movement in any direction other than the direction of rotation of the outer body.
The reference for the mounting position is established without even a slight movement of several micrometers.

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. Area IC
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 mounting preload force is held by the frictional force of the engagement between the frame 1 and the step motor 7. 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 guide hole 1d and engage it without any clearance, the protrusion 1j or the boss 7C must be deformed in some way to make the relative shapes match. In this embodiment, in order for the protrusion 1j to actively receive deformation, the cross-sectional shape of the protrusion 1j is configured to be approximately triangular to facilitate deformation of its apex, which does not affect the bearing performance, etc. Moreover, the insertion force required when inserting the boss 7C to deform 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 1j is formed from the middle of the guide hole 1d, and a slope 1jl is further 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 re-performed for after-sales service, etc., adhesive supply, adhesive quality control, and bonding work are required. It is assumed that training etc. will be required, resulting in an extremely undesirable fixed structure.

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

By the way, when readjusting the step motor after it has been fixed with adhesive as described above, the problem is how to remove the step motor that has been fixed with adhesive, but in this example, As mentioned above, the step motor 7 does not rotate by its own energy even if it encounters a disturbance such as severe vibration or shock, so the 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 aware of the handling of the screw 15 mentioned above in Fig. 2 and tJ3. It doesn't matter if it's there or not, but it's best to go to the market without it and you won't have any inconvenience 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 support is supported by the frame 1 without creating any clearance for the step motor 7 mentioned above, and the position in the plane direction with respect to the reference plane IC 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 a means for configuring a reference for the mounting position in the current state, 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.

! 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.

The difference between this application example with the above configuration and the embodiment described above in FIGS. 2 and 3 is the means for applying a required mounting preload to the step motor 17, and in FIGS. 7b constitutes 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 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, let's talk about other application examples of the present invention! This will be explained based on FIG.

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 l for mounting recording and reproducing elements M functions as a main shaft motor 4 serving as a rotary 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 are movably guided in the radial direction of the recording medium (not shown) for free access. The carriage 26 is equipped with a needle-shaped lead pin 26a, and the lead pin 26a is preloaded against a lead screw 27a, which is a rotating output shaft of a step motor 27 mounted on the frame 1 (not shown). (Omitted) The carriage 26 is configured to be 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 relative position of the head 5 and the track position of the disk (not shown) is adjusted to a predetermined positional relationship.

In the conventional example described above, the step motor is fixed by tightening the screws after completing the position adjustment of the relative position of the disk track position and the head. Despite the adjustment, the relative positional relationship was out of order, making it difficult to configure a precise relative positional relationship. However, this application example has improved this point, and the track position and head position have been improved. Regarding the mechanism for easily adjusting the delicate relative positional relationship and maintaining the adjusted state of the relative position without causing any deviation, the mechanism is based on Figs. 2 to 5 and Figs. 6 and 7. All the above-mentioned contents 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. The motor is provided with a boss coaxial with the rotary output shaft and a plurality of mounting members, and the mounting side of the step motor has a guide hole formed on a reference surface, and a guide hole arranged opposite to the reference surface and formed on the mounting member. A plurality of correspondingly engageable mounting parts are configured, and the step motor mounting position is set by engaging the boss in the guide hole in a state where the step motor and the mounting side face each other in a plane, and setting the mounting position of the step motor. By rotating and engaging the mounting member with the mounting part to create a resilient force, and the step motor is structured to be held by the resilient force, it is not only easy to combine both, but also The step motor is held without any external force applied to it, and there is no change in the holding state when adjusting the rotation of the outer body and when the rotation adjustment is completed, so even delicate rotation adjustments can be made stably. In fine position adjustment of the relative position between the disk track position and the head, the step motor is rotated to adjust the position, and the position adjustment is held without disturbing the completed position adjustment. It became possible to easily adjust the precise relative positional relationship, and as computers and other devices became faster and more capable, recording capacity expanded dramatically and recording and playback density became even higher. Nowadays, it has become necessary to configure the relative positional relationship between the track position of the disk and the head with a deviation of only a few μm or less, making it easier to make delicate relative positional adjustments in recording and reproducing devices, making it possible to record and reproduce high track density. Even equipment can be stably mass-produced easily.

In addition, the holding structure of the step motor of the present invention has a simple structure, and it is extremely easy to assemble the step motor and automate the rotation adjustment, allowing for highly efficient and stable mass production. The effect is extremely large.

[Brief explanation of the drawing]

1 to 5 show one of the most suitable embodiments of the recording and reproducing apparatus of the present invention, and the 61st! I and FIG. 7 show an example of its application, and FIG. 8 shows another example of application. Fig. 1 is an exploded perspective view of the recording/reproducing device, Fig. 2 is a detailed view of the main parts of Fig. , Fig. 4 is a diagram for 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, and is a guide structure diagram of the 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. 10 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. Frame attachment part reference surface guide protrusion Carriage rack step motor binion attachment plate boss screw 1B, ...,,, adhesive, etc. Applicant: Seven Iko Ebson Co., Ltd. Agent Patent attorney: Kizobe Suzuki and 1 other person Figure 3 Figure Figure Figure Figure

Claims (1)

[Scope of Claims] The outer body of a step motor that moves and drives a carriage equipped 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. In a recording/reproducing device that adjusts the relative positional relationship between a predetermined track position of a disk and the head, the step motor has a boss coaxial with a rotary output shaft and a plurality of attachment members protruding toward the outer circumference of its outer body. a guide hole that engages with the boss and forms a mounting position reference on a reference surface perpendicular to the axial direction of the step motor; and a guide hole that is arranged opposite to the reference surface, and A plurality of attaching parts that can be engaged with each other are formed in correspondence with the attaching members, and the boss is engaged with the guide hole in a state where the attaching members and the attaching parts face each other in a plane to set the attaching position. The stepper motor is characterized in that the outer body of the step motor is rotated to engage the mounting member with the mounting portion to generate a resilient force, and the step motor is held by the resilient force. Recording/playback device.