JP2012116315A - Rotation angle adjusting mechanism and electric apparatus equipped with the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rotation angle adjusting mechanism capable of easily and properly adjusting a rotation angle of an electric apparatus with an angle not easily changed by external stress or the like after adjustment.SOLUTION: As a member sandwiched between a fixed side member and an adjusted side member, a gear-like attachment is provided which is formed by overlapping the fixed side gear in which teeth are formed at every angle a° with constant intervals with the adjusted side gear in which teeth are formed at every angle b° with constant intervals with central axis identical along a rotation axis direction. At the fixed side member, a fixed side gear engagement groove is formed with which the fixed side gear can be engaged in a plurality of lanes. At the rotation axis of the adjusted side member, an adjusted side gear engagement groove is formed with which the adjusted side gear can be engaged in a plurality of lanes. The angle at which the fixed side gear is engaged with the fixed side gear engagement groove and the angle at which the adjusted side gear is engaged with the adjusted side gear engagement groove are adjusted.

Description

  The present invention relates to a rotation angle adjustment mechanism that is fixed in an electrical apparatus or the like after adjusting the rotation angle at the time of installation and prevents subsequent rotation after the fixing.

There is a demand for electrical devices and the like to be fixed after adjusting the rotation angle at the time of installation and to prevent subsequent rotation after fixing. For example, installation of a vehicle-mounted camera can be mentioned. For the adjustment of the rotation angle of the in-vehicle camera, for example, a screw hole is provided on the side of the camera body, a mounting bracket (bracket) to the vehicle is screwed there, and the camera rotates the screw after adjusting it to an appropriate vertical angle. The method of tightening to such an extent that it does not occur is common and widely used. With respect to tightening, there are a case where there are one screw on each of the left and right sides, and a case where there are two screws on the left and right sides in order to attach more firmly / stablely. For example, Patent Documents 1 and 2 are cited as literatures of an in-vehicle camera that employs such rotation angle adjustment. 2 and 8 of Patent Document 1 and FIGS. 1 and 2 of Patent Document 2 disclose a conventional rotation angle adjusting mechanism.
Japanese Patent Laid-Open No. 08-119036 JP-A-10-71890

However, the method for adjusting and fixing the rotation angle has the following problems.
(1) Difficult to adjust the vertical angle Among the in-vehicle cameras, especially in the rear imaging camera, it is desirable that the car bumper is located at the bottom of the imaging screen, but the camera image is displayed while the camera is outside the car. The monitor is generally provided near the driver's seat, and adjustment while viewing the monitor image is virtually impossible. Therefore, a monitor for adjustment and a power supply for the camera are separately installed near the camera, and after temporarily connecting and adjusting, the connection to the monitor near the driver's seat is made again. This is very time consuming.
Moreover, in order to solve this, since the optimal rotation angle is uniquely determined by predefining the camera mounting position for each vehicle type, there is a method of adjusting the rotation angle using an angle measuring jig, etc. It takes time and effort to prepare and use a dedicated jig, and there is a problem that the optimum angle cannot be obtained due to the usage method and angle reading error.

(2) Deviation of optimum imaging range due to unintentional rotation Since the camera body is angle-adjusted by screwing from the side, the fixing force in the rotational direction is weak, and vibration for a long period of time, for example, opening and closing the trunk When stress is applied unintentionally to the camera, there is a problem that the camera rotates around the screw in the vertical direction and deviates from the optimum imaging range.

Here, as a method for solving the problems (1) and (2), the structure shown in FIG. 6 is first considered. The gear-shaped attachment 19 is fitted into the camera body 20, and the quadrangular convex portion at the center of the attachment 19 is inserted into the quadrangular hole of the camera mounting bracket. At this time, if the gear is formed in increments of 10 °, for example, according to the rotation angle of the camera to be set, and if the gear-like attachment 19 is fitted in the camera body 20, there is no jig or the like in a desired rotation angle of 10 °. Inadvertent rotation can also be prevented.
However, in this method, when it is desired to set the rotation angle finely, the number of teeth of the gear-shaped attachment must be increased accordingly, and the disadvantage that the resistance to the rotational stress is weakened accordingly. Further, when the camera body 20 or the attachment 19 is made of a resin material, the deterioration of the resistance is remarkable.
The above (1), (2) and the above-mentioned problems are not limited to the vertical angle adjustment of the in-vehicle camera, but are common to electric devices that require rotation angle adjustment and fixation.

  The present invention has been made in view of the above problems, and provides a rotation angle adjustment mechanism that can easily and appropriately adjust the rotation angle of an electrical device and that does not easily change due to external stress after adjustment. It is intended to do.

  Claim 1 of the present invention comprises an adjusted side member which is an object to be rotated and adjusted with reference to the rotation axis, and a fixed side member for fixing the rotation axis of the adjusted side member. In the rotation angle adjustment mechanism for adjusting the rotation angle of the adjusted side member, the fixed side gear and the fixed side gear formed at regular intervals for every angle a ° between the fixed side member and the adjusted side member and each angle b ° A gear-like attachment formed by overlapping the gear to be adjusted with teeth formed at equal intervals in the direction of the rotation axis with the same central axis is provided, and the fixed gear can be fitted to the fixed member at every a ° A fixed-side gear fitting groove is formed, and an adjusted-side gear fitting groove is formed on the rotating shaft portion of the adjusted-side member so that the adjusted-side gear can be fitted every b °. Fitting the fixed side gear fitting groove and the adjustable side gear into the adjusted side gear fitting groove In combination with the degree, which is a rotation angle adjusting mechanism and adjusting the rotation angle of the adjustment member relative to the fixed member.

  According to a second aspect of the present invention, in addition to the first aspect, the fixed side gear is formed by setting a ° so that 360 ° / a ° = integer, and the adjusted side gear is 360 ° / b ° = It is formed by setting b ° to be an integer, and corresponding to these, the fixed side gear fitting groove that can be fitted as 360 ° / a ° and can be fitted as 360 ° / b ° A rotation angle adjusting mechanism formed with a gear-fitting groove that is adjusted to be adjustable, and the maximum common divisor x of the dimensionless numbers a and b of a ° and b ° can be adjusted as the minimum adjustment angle x °. The rotation angle adjustment mechanism characterized by the above.

  According to claim 3 of the present invention, in addition to claim 2, when the minimum adjustment angle is x °, x ° / m (m is a positive even number), or x ° / n (n is positive). The rotation angle adjusting mechanism is characterized in that m or n fixed side gear fitting grooves whose angles are different from each other by an even number of times (an odd number) are provided in the fixed side member.

  A fourth aspect of the present invention is an electric device including the rotation angle adjusting mechanism according to any one of the first to third aspects.

  According to the first aspect of the present invention, teeth are formed at equal intervals for each angle b ° with the fixed-side gears formed at equal intervals for each angle a ° between the fixed side member and the adjusted side member. A gear-like attachment formed by overlapping the adjusted side gear with the same central axis in the rotation axis direction is provided, and the fixed side gear can be fitted to the fixed side member every a °. A groove is formed, and on the rotating shaft portion of the adjusted side member, an adjusted side gear fitting groove that allows the adjusted side gear to be fitted every b ° is formed, and the fixed side gear is fixed to the fixed side gear fitting groove. The number of gear teeth can be reduced by adjusting the rotation angle of the adjusted side member with respect to the fixed side member in combination with the angle of fitting to the adjusted side gear and the angle of fitting the adjusted side gear into the adjusted side gear fitting groove. It is possible to adjust the angle by a small adjustment angle unit while configuring less and strengthening the resistance to rotational stress.

  According to the invention of claim 2, the fixed side gear is formed by setting a ° so that 360 ° / a ° = integer, and the adjusted side gear is set to 360 ° / b ° = integer. A fixed side gear fitting groove that can be formed according to 360 ° / a °, and an adjustable side gear that can be fitted according to 360 ° / b °. Since the fitting groove is formed, it is possible to adjust by combining the two fitting angles of a ° and b °. At this time, the greatest common divisor x of the dimensionless numbers a and b of a ° and b ° is minimized. The adjustment angle is x °. This makes it possible to easily derive a ° and b ° necessary for obtaining a desired minimum adjustment angle x °.

  According to the third aspect of the present invention, when the minimum adjustment angle obtained by the above structure is x °, x ° / m (m is a positive even number), or x ° / n (n is Since m or n fixed side gear fitting grooves whose angles are different from each other by an even multiple of (positive odd number) are provided in the fixed side member, the minimum adjustment angle x ° is substantially equal to n or m. The angle can be adjusted with 1 as a new minimum adjustment unit.

  According to the fourth aspect of the present invention, since the electric device includes the rotation angle adjusting mechanism according to the present invention, the above-described effect can be obtained in an electric device that requires adjustment and fixing of the rotation angle.

It is the perspective view showing the fixed side member 11, the to-be-adjusted side member 12, and the gear-shaped attachment 13 which comprise the rotation angle adjustment mechanism 10 by this invention. FIG. 6 is a front view showing the configuration of the gear-like attachment 13. It is a table | surface figure showing the minimum combination of n1 and n2 for obtaining adjustment angle 0 degree-350 degrees in the case of using the gear-shaped attachment 13 comprised by a = 90 degrees and b = 40 degrees. It is the table | surface which represented the combination of a and b and the minimum angle x ° obtained by this about various angles. FIG. 5 is a manual diagram showing a specific combination of n1 and n2 for obtaining an adjustment angle of 0 ° to 350 ° when the gear-like attachment 13 configured at a = 90 ° and b = 40 ° is used. It is a perspective view showing one method of a rotation angle adjustment mechanism.

  The rotation angle adjusting mechanism according to the present invention includes an adjusted side member that is an object to be rotated and adjusted with reference to the rotation axis, and a fixed side member for fixing the rotation axis of the adjusted side member. In the rotation angle adjustment mechanism for adjusting the rotation angle of the adjusted side member with respect to the fixed side gear and the angle b ° formed with teeth at regular intervals for every angle a ° between the fixed side member and the adjusted side member Provided with a gear-like attachment formed by overlapping the gear to be adjusted with teeth formed at equal intervals in the direction of the rotation axis with the same central axis, the fixed gear is fitted to the fixed member at every a ° The fixed side gear fitting groove is formed, and the adjusted side gear fitting groove is formed on the rotating shaft portion of the adjusted side member so that the adjusted side gear can be fitted every b °. The angle of fitting the fixed side gear fitting groove and the adjusted side gear to the adjusted side gear fitting groove In combination with the mating angles, it is characterized in that for adjusting the rotation angle of the adjustment member relative to the fixed member. Details will be described below.

An embodiment of a rotation angle adjusting mechanism 10 according to the present invention will be described with reference to the drawings. In addition, it demonstrates using the example of a vehicle-mounted camera as an example which employ | adopted the rotation angle adjustment mechanism 10. FIG. In FIG. 1, the fixed side member 11 is a mounting bracket shaped so as to sandwich an adjusted member 12 fixedly attached to the vehicle side. The adjusted side member 12 is attached to the fixed member 11 after adjusting the angle. It is a camera member, and is characterized in that the fixed side member 11 and the adjusted side member 12 are connected by a gear-like attachment 13 so as to be adjustable in angle at a predetermined angular interval.
Note that the configuration in which the fixed-side member 11 has a shape in which the adjusted member 12 is sandwiched by one component is merely an example, and a configuration in which the adjusted-side member 12 is sandwiched by two members is also conceivable. Design is possible.

The gear-shaped attachment 13 includes a fixed side gear 14 fitted to the fixed side member 11 side and an adjusted side gear 15 fitted to the adjusted side member 12 side, with the central axis being the same and overlapping in the axial direction. In this structure, the positional relationship between the fixed side gear 14 and the adjusted side gear 15 in the rotation direction does not change. The fixed-side member 11 is formed with a fixed-side gear fitting groove 16 into which the fixed-side gear 14 is fitted. The adjusted-side member 12 is fitted with the adjusted-side gear 15 into which the adjusted-side gear 15 is fitted. The groove 17 is formed, the angle is adjusted by a method described later, and the fixed side member 11 and the adjusted side member 12 are connected to each other by the gear-like attachment 13 and are completely fixed by the fixing screw 18. It has become.
In FIG. 1, two fixed side gear fitting grooves 16, 16 a and 16 b, are formed for reasons described later. However, this is an example, and even when only one is formed. Good. In the following embodiments, when simply expressed as the fixed-side gear fitting groove 16, it is used as a concept including 16a and 16b.
Moreover, in FIG. 1, although it forms in the state in which a part of the to-be-adjusted side gear fitting groove | channel 17 was opened, this is performed from the viewpoint different from the objective of this invention of space saving as a whole. Therefore, the adjusted side gear fitting groove 17 includes a case where the adjusted side gear 15 is formed so as to be completely fitted over the entire circumference.

The configuration of the gear attachment 13 will be described in more detail. As shown in FIG. 2, the gear-like attachment 13 in the present invention is characterized in that the fixed gear 14 forms teeth at regular intervals every a °, and the adjusted gear 15 has teeth at regular intervals every b °. They are formed by overlapping them in the axial direction with the same central axis. Further, by forming the fixed side gear fitting groove 16 and the adjusted side gear fitting groove 17 corresponding to these, the angle can be adjusted at an angle x ° smaller than either a or b. Specifically, in FIG. 2, the angle can be adjusted every 10 ° by configuring at a = 90 ° and b = 40 °.
In addition, in FIG. 2, although the square is employ | adopted as an example of the fixed side gearwheel 14 which formed the tooth | gear every a = 90 degrees, a polygon is also a kind of gearwheel. A polygonal shape is also included. However, since the polygon becomes closer to a circle as the angle per unit becomes smaller, there is a risk of weakening against rotational stress. In such a case, it is better to employ a gear formed by unevenness. It is desirable because it becomes strong against.

Next, a specific angle adjustment method using the rotation angle adjustment mechanism 10 according to the present invention will be described. In the present invention, in order to adjust the rotation angle, the fixed side member 11 is rotated every a ° and then fitted (engaged), and the adjusted side member 12 is rotated every b °. The final installation angle of the adjusted side member 12 is adjusted by a combination with the pattern to be fitted above.
As a specific example, a = 90 ° and b = 40 ° shown in FIG. 2 with reference to a case where the fixed side member 11 is placed on the left side and the adjusted side member 12 is placed on the right side and observed from the side. The case where the gear-shaped attachment 13 comprised by is used is demonstrated. The adjusted side gear 15 in increments of 40 ° is inserted into the adjusted side gear fitting groove 17 of the adjusted side member 12 by rotating it counterclockwise by two increments (this operation causes the camera body to rotate 80 ° clockwise). Rotation), and further, the fixed side gear 14 is fitted into the fixed side gear fitting groove 16 of the fixed side member 11 by rotating it counterclockwise by one angle (one step) (this operation causes the camera body to move counterclockwise). Finally, the adjusted side member 12 is rotated and fixed counterclockwise by 10 ° compared to the state before the operation.

This will be further generalized and described. The fixed-side gear 14 is moved n1 times (a whole number, in the case of positive, counterclockwise, negative, with respect to the fixed-side gear fitting groove 16 of the fixed-side member 11. In the case of clockwise rotation), the adjusted side gear 15 is rotated n2 times per b ° with respect to the adjusted side gear fitting groove 17 of the adjusted side member 12 (integer, if positive, clockwise) By rotating only counterclockwise in the case of a negative value, an adjustment angle that is an integral multiple of the minimum adjustment angle (minimum angle) x ° is obtained as the final adjustment angle of the member 12 to be adjusted.
FIG. 3 shows the minimum combination of n1 and n2 for obtaining an adjustment angle of 0 ° to 350 ° when the gear-like attachment 13 configured with a = 90 ° and b = 40 ° is used. . As can be seen from FIG. 3, an adjustment angle that is an integral multiple of 10 ° can be obtained with x = 10 ° as a minimum unit.

Up to this point, the gear-like attachment 13 configured with a = 90 ° and b = 40 ° has been described as an example, but various settings for a ° and b ° are assumed. FIG. 4 shows a combination of a ° and b ° and the minimum angle x ° obtained thereby for various angles. As can be seen from the relationship between a °, b ° and x ° in FIG. 4, the smallest angle is the adjustment angle x ° with the greatest common divisor x of the dimensionless numbers a and b of a ° and b °. I understand that there is.
In consideration of such a relationship, the angle a and b can be increased to some extent, the number of teeth of the gear can be reduced to be strong against rotational stress, and the minimum angle x ° of the angle to be adjusted is Small is the ideal combination of a and b. For example, when a = 45 ° and b = 40 °, the minimum angle x = 5 °, and in a configuration with a relatively small number of teeth, the angle can be adjusted in units of 5 °.

Next, the fixed side gear fitting groove 16 into which the fixed side gear 14 provided on the fixed side member 11 is fitted will be described. In FIG. 1, the fixed-side gear fitting groove 16 a has a configuration in which three grooves in which the fixed-side gear 14 formed by a square of the gear-like attachment 13 configured at a = 90 ° and b = 40 ° is fitted are connected. ing. This is a configuration for enabling a slight position adjustment according to the type of vehicle on which the in-vehicle camera is mounted, and it is not always necessary to provide a plurality of fitting grooves, and only one is provided. There may be. As for the fixed side gear fitting groove 16b, three grooves for fitting the fixed side gear 14 are connected for the same reason.
By the way, in the fixed side gear fitting groove 16a and the fixed side gear fitting groove 16b, the groove forming angles are different from each other by 45 °. Thus, the adjustment angle obtained when the fixed side gear fitting groove 16a is used is 10 °, 20 °,..., 350 °, whereas the fixed side gear fitting groove 16b is used. The adjustment angles obtained are 5 °, 15 °,..., 355 °. That is, the minimum adjustment angle of the gear-like attachment 13 configured with a = 90 ° and b = 40 ° is 10 °, but the installation positions of the fixed side gear fitting groove 16a and the fixed side gear fitting groove 16b are 45. By shifting the angle, adjustment in 5 ° units, which is half of 10 °, can be realized by fitting in the fixed-side gear fitting groove 16b (it is meaningless to be 45 ° and, as a result, a multiple of 10 ° This makes it possible to adjust the angle by 5 ° which does not appear in
When this is generalized, two fixed-side gear fitting grooves 16a and fixed-side gear fittings differing in angle by a half angle of the minimum angle x ° determined by the angles of a ° and b ° constituting the gear-like attachment 13. By providing the joint groove 16b, the angle can be adjusted with an angle x ° / 2 which is a half of the minimum angle as a minimum adjustment unit. (The same applies to the case where the two fixed-side gear fitting grooves 16a and the fixed-side gear fitting groove 16b are different in angle by an odd multiple of x ° / 2.)
When the above is further expanded, m (m is a positive even number) or n (n is a positive odd number) fixed side gear fitting grooves having different angles may be provided. In this case, when the number is m, an odd multiple of x ° / m is provided, and when the number is n, the angle is different from each other by an even multiple of x ° / n. Angle adjustment can be performed with n as a new minimum adjustment unit.

In the configuration as described above, when the angle is actually adjusted, the fitting position of the gear-like attachment 13 with respect to the fixed-side gear fitting groove 16 of the gear-like attachment 13 and the adjusted side according to the adjustment angle to be obtained. The angle adjustment is performed by determining the fitting position of the gear 15 with respect to the adjusted side gear fitting groove 17, and as shown in FIG. 3, the angle to be adjusted and the number of rotations of each gear, n1 and The relationship with n2 is complex. Therefore, the angle is adjusted using a manual showing the number of revolutions shown in FIG.
More specifically, for example, a mark is provided at one point on the gear-like attachment 13 in FIG. 2, and the fixed side gear fitting groove 16 and the adjusted side gear fitting groove 17 are fitted with gears. Number the counter position counterclockwise (clockwise on the opposite side), and “fit so that the mark is positioned in the No. groove on the fixed side gear fitting groove 16 for each adjustment angle. Then, it is conceivable to write a manual such as “Give so that the mark is positioned in the Δ-th groove with respect to the adjusted gear fitting groove 17”.
An example of a specific manual is shown in FIG. The attachment position of the fixed side gear 14 (internal tooth) is represented by four ways, the attachment position of the adjusted side gear 15 (external tooth) is represented by nine ways, and these combinations are used every 10 ° from 0 ° to 350 °. Regarding the 36 kinds of angle adjustment, it can be said that a manual as shown in FIG. 5 is easy for the user to use.

  As described above, in the rotation angle adjusting mechanism 10 of the present invention, in the gear-like attachment 13, the teeth of the fixed side gear 14 are set at equal intervals for each a ° (360 ° / a ° = an integer so as to be an integer). The teeth of the gear 15 to be adjusted are formed at equal intervals for every b ° (360 ° / b ° = b ° is set to be an integer), and 360 ° / a corresponding to these. By forming the fixed-side gear fitting groove 16 that can be fitted as shown in FIG. 5 and the adjusted-side gear fitting groove 17 that can be fitted as 360 ° / b °, the dimensionless number a of a ° and b ° , B, the greatest common divisor x being the minimum adjustment angle x °, and the angle can be adjusted. This makes it possible to adjust the angle by a small adjustment angle unit, while reducing the number of teeth of the gear and strengthening the resistance to rotational stress.

In the above embodiment, as shown in FIG. 2, the adjusted side gear 15 of the gear-like attachment 13 is configured with teeth provided at equal intervals on the entire circumference, but the adjusted side gear fitting groove 17 is entirely formed. When formed over the circumference, the number of teeth of the adjusted side gear 15 can be reduced as long as the resistance to rotational stress satisfies the condition.
In FIG. 2, the fixed side gear 14 is formed in a square shape, and the fixed side gear fitting groove 16 has a configuration in which three grooves into which the fixed side gear 14 is fitted are connected. Although it is not permissible to omit the number of teeth of the gear, the fixed side gear 14 is also formed as a gear instead of a regular polygon, and the fixed side gear fitting groove 16 also has a recess corresponding to the number of teeth of the same gear. In the case of a configuration in which only one formed over the range is provided, the number of teeth of the fixed-side gear 14 can be reduced as long as the resistance to rotational stress satisfies the condition.

  In the above embodiment, a gear having teeth provided at equal intervals on the entire circumference of one rotation (360 °) is used, and a fitting groove having the same number of recesses on the entire circumference is formed corresponding to this gear. Explained. However, for example, when the movable range corresponds to a limited movable range such as 0 ° to 90 °, the tooth of the gear 15 on the gear-side attachment 13 and the gear on the side of the member 12 to be adjusted are included. The adjustment-side gear fitting groove 17 may not necessarily be arranged all around the circumference, and in such a case, when the number of rotations n2 that can achieve the movable range is 0 ° and 90 °. A similar function can be realized simply by providing a recess in which the tooth is located.

  In the above-described embodiment, the case where a ° is set so that 360 ° / a ° = integer and b ° is set so that 360 ° / b ° = integer has been described. It is not limited. The above equation is a condition when the teeth are arranged around the entire circumference. As described above, when the teeth are not arranged around the circumference, this restriction may not be imposed.

  In the above-described embodiments, the rotation angle adjustment mechanism (vertical angle) of the in-vehicle camera has been described. However, the present invention is not limited to this, and can be widely used for adjusting the rotation angles (horizontal, vertical, vertical) of various electric devices. It can be used.

DESCRIPTION OF SYMBOLS 10 ... Rotation angle adjustment mechanism, 11 ... Fixed side member (mounting bracket), 12 ... Adjusted side member (camera member), 13 ... Gear attachment, 14 ... Fixed side gear, 15 ... Adjusted side gear, 16 ... Fixed Side gear fitting groove, 17 ... Adjusted side gear fitting groove, 18 ... Fixing screw, 19 ... Attachment, 20 ... Camera body.

Claims (4)

  A rotation angle adjusting mechanism that includes an adjusted side member having a rotation axis and a fixed side member for fixing the rotation axis of the adjusted side member, and adjusts the rotation angle of the adjusted side member with respect to the fixed side member. A fixed side gear having teeth formed at equal intervals for each angle a ° and a adjusted side gear having teeth formed at equal intervals for each angle b ° between the fixed side member and the adjusted side member Is provided with a gear-like attachment formed by overlapping the central axis in the direction of the rotation axis, and a fixed-side gear fitting groove in which the fixed-side gear can be fitted every a ° is formed in the fixed-side member. The rotation angle adjusting mechanism is characterized in that an adjustment side gear fitting groove into which the adjustment side gear can be fitted every b ° is formed in the rotation shaft portion of the adjustment side member.   The fixed side gear is formed by setting a ° so that 360 ° / a ° = integer, and the adjustment side gear is formed by setting b ° so that 360 ° / b ° = integer, Corresponding to these, the fixed side gear fitting groove that can be fitted in 360 ° / a ° and the adjusted side gear fitting groove that can be fitted in 360 ° / b ° are formed. The rotation angle adjustment mechanism according to claim 1, characterized in that the rotation angle adjustment mechanism can be adjusted with the greatest common divisor x of the dimensionless numbers a and b of a ° and b ° as the minimum adjustment angle x °. mechanism.   When the minimum adjustment angle is x °, the angles are different from each other by an odd multiple of x ° / m (m is a positive even number) or an even multiple of x ° / n (n is a positive odd number). 3. The rotation angle adjusting mechanism according to claim 2, wherein m or n fixed side gear fitting grooves are provided in the fixed side member.   An electric device comprising the rotation angle adjusting mechanism according to any one of claims 1 to 3.

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