JP4454710B2 - Rotating device with position detecting device and electronic device using the same - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a rotation device with a position detection device that can be thinned as a whole and an electronic apparatus using the rotation device.
[0002]
[Prior art]
FIG. 9 is a conceptual explanatory view showing a rotating device using a conventional ultrasonic motor. The rotation device 5 includes a drive unit 10, an ultrasonic motor 20, a position detection unit 31, and an output display unit 40. The drive unit 10 receives a change amount signal indicating a change amount of a certain physical parameter (for example, a traveling speed of a car) and a position signal from the position detection unit 31, and sends a drive signal based on these signals to the ultrasonic motor 20. Supply.
[0003]
The ultrasonic motor 20 includes a vibrating body 21 serving as a stator having a piezoelectric body, a moving body 22 serving as a rotor, a pressure unit 23 that presses the vibrating body 21 and the moving body 22, and a shaft 24. Yes. In the ultrasonic motor 20, the vibrating body 21 vibrates based on the drive signal received from the driving unit 10, and the vibration is converted into a rotational motion by friction to rotate the moving body 22. Since the principle of the ultrasonic motor is known, the description thereof is omitted.
[0004]
The output display unit 40 is fixed to the shaft 24 of the ultrasonic motor 20 and rotates as the shaft 24 rotates. The position detection unit 31 detects the current position of the output display unit 40 and supplies a position signal corresponding to the position to the drive unit 10. The drive unit 10 specifies the current position of the output display unit 40 based on the position signal, and supplies a drive signal in consideration of the position to the ultrasonic motor 20.
[0005]
FIG. 10 is a cross-sectional view showing a case where the rotating device 5 is used for a vehicle travel speed meter. As another conventional example of such a meter, for example, one disclosed in JP-A-63-309995 is known. In the meter 500, an output extraction protrusion 592 is provided on the stator 591, and a rotor 593 is disposed so as to contact the protrusion 592. A position detection sensor 594 is provided above the rotor 593. A shaft 595 is provided at the center of the rotor 593, and an indicator needle 596 is attached to the tip thereof. 9, the stator 591 and the protrusion 592 are the vibrating body 21 shown in FIG. 9, the rotor 593 is the moving body 22 shown in FIG. 9, the position detection sensor 594 is the position detection unit 31 shown in FIG. The needle 596 corresponds to the output display unit 40 shown in FIG.
[0006]
The position detection sensor 594 detects the current position of the pointing needle 596 and outputs a position signal corresponding to the position to a drive circuit (not shown). The drive circuit supplies the stator 591 with a drive signal based on a change amount signal corresponding to the traveling speed of the vehicle and a position signal from the position detection sensor 594. The stator 591 vibrates based on this drive signal, and the rotor 594 rotates due to friction with the protrusions 592. As a result, the indicator needle 596 rotates to a position representing the traveling speed of the vehicle. In FIG. 10, the indicator plate is omitted.
[0007]
[Problems to be solved by the invention]
As described above, conventionally, the output display unit 40 (or the indicator needle 596) and the position detection unit 31 (or the position detection sensor 94) are arranged so as to overlap each other. However, when the output display unit 40 and the position detection unit 31 are arranged in an overlapping manner, it is necessary to secure a space for arranging the position detection unit 31, so that there is a problem that the entire rotation device 5 becomes thick. . Further, when the rotating device 5 is thick, there is a problem that an electronic device itself using the rotating device 5 becomes thick.
[0008]
The present invention has been made in view of the above points, and an object of the present invention is to provide a rotating device with a position detection device and an electronic apparatus using the same, which can be thinned as a whole.
[0009]
[Means for solving problems]
In order to achieve the above object, a rotation device with a position detection device according to claim 1 includes an output display means for displaying or outputting a predetermined value by rotating around an axis, and an output display means for the output display means. In a rotation device with a position detection device having a drive means for rotationally driving and a position detection means for detecting a position of the output display means and outputting a position detection signal corresponding to the position, in conjunction with the output display means A rotating interlocking rotating means is provided, and the position detecting means is arranged at a position not overlapping with the driving means or the output display means, and the position detecting means detects the position of the interlocking rotating means.
[0010]
If the position detection means is arranged so as not to overlap the drive means or the output display means, for example, the output display means, the entire apparatus can be thinned. The interlocking rotation means is provided in the output display means. As a specific example, a configuration in which a rotating slit plate is attached to an indicator needle as the output display means can be mentioned. If the position of the interlocking rotation means is detected, the rotation position of the output display means can be detected.
[0011]
Next, a rotation device with a position detection device according to claim 2 is an output display means for displaying or outputting a predetermined value by rotating around an axis, and a drive means for rotationally driving the output display means. A position detection means for detecting a position of the output display means and outputting a position detection signal corresponding to the position; a drive signal based on the signal and the position signal received from the signal according to a predetermined change amount; In a rotation device with a position detection device having a drive signal supply means for performing rotation control of the drive means, an interlocking rotation means that rotates in conjunction with the output display means is provided, and the position detection means is centered on the axis. Arranged on the opposite side of the output display means so as not to overlap the drive means or the output display means, and the position detection means detects the position of the interlocking rotation means, and according to the position A position signal and supplies the drive signal supply means.
[0012]
That is, in this rotation device with a position detection device, the drive means or output display means and the position detection means are arranged so as not to overlap. For this reason, it is not necessary to secure a space for arranging the position detecting means, and the entire rotating device can be made thin.
[0013]
Next, in the rotation device with a position detection device according to a third aspect, the output display means and the interlocking rotation means are integrated substantially planarly in the rotation device with the position detection device.
[0014]
Thus, if the output display means and the interlocking rotation means are integrated in a substantially planar manner, the entire rotation device can be made thinner. Further, since the number of parts can be reduced, the structure is simplified.
[0015]
Next, according to a fourth aspect of the present invention, there is provided the rotation device with a position detection device, wherein the position detection means detects the position of the interlocking rotation means using light, magnetism or a mechanical contact. To do.
[0016]
By using light, magnetic or mechanical contact to detect the position of the interlocking rotation means, the position of the interlocking rotation means can be detected accurately and easily.
[0017]
Next, a rotation device with a position detection device according to a fifth aspect is provided with a rotating means having a rotor and a stator, an indicator needle provided on the rotor shaft, and provided at an opposite end of the indicator needle with respect to the rotor shaft. A rotary slit plate that rotates in conjunction with the pointing needle and a position detection means that detects the rotational position of the rotary slit plate are provided.
[0018]
Since the rotary slit plate is provided at the opposite end of the indicating needle and the rotational position of the rotary slit plate is detected by the position detecting means, it is not necessary to place the position detecting means on the rotating means.
[0019]
Next, a rotation device with a position detection device according to claim 6 is provided with a drive unit provided with a projection for output extraction on one surface, a piezoelectric body spread on the other surface, and a polarization treatment applied to the piezoelectric body, A movable body arranged to contact the protrusion, an indicator needle provided on the movable body, a rotary slit plate that is provided at an opposite end of the indicator needle with respect to the rotation center and rotates in conjunction with the indicator needle, Position detecting means for detecting the rotational position of the rotating slit plate.
[0020]
Since the rotary slit plate is provided at the opposite end of the indicating needle and the rotational position of the rotary slit plate is detected by the position detecting means, it is not necessary to place the position detecting means on the rotating means. Further, since the ultrasonic motor including the driving body and the moving body is used as the rotating means, the apparatus can be thinned.
[0021]
Next, an electronic device according to a seventh aspect of the present invention acquires a position signal from the position detection device of the rotation device with the position detection device according to any one of claims 1 to 6 and the rotation device with the position detection device, it is obtained by a rotation control means for controlling the rotational position detector equipped rotator.
[0022]
The position detector equipped rotating device incorporated in an electronic device, since to control the rotation of the rotating device on the basis of a signal from the position detector equipped rotation device, with the thickness of the position detecting device with rotary device The electronic device itself can be made thin.
[0023]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a rotating device with a position detection device and an electronic apparatus using the same according to the present invention will be described in detail in the order of [Embodiment 1] to [Embodiment 4] with reference to the accompanying drawings. In addition, this invention is not limited by this embodiment.
[0024]
[Embodiment 1]
FIG. 1 is a conceptual explanatory view showing a rotating device using an ultrasonic motor according to Embodiment 1 of the present invention. The rotating device 1 includes a drive unit 10, an ultrasonic motor 20, a position detection unit 30, and an output display unit 40. The drive unit 10 receives a change amount signal indicating a change amount of a certain physical parameter (for example, a traveling speed of a car) and a position signal from the position detection unit 30, and sends a drive signal based on these signals to the ultrasonic motor 20. Supply.
[0025]
The ultrasonic motor 20 includes a vibrating body 21 serving as a stator, a moving body 22 serving as a rotor, a pressing unit 23 that presses the vibrating body 21 and the moving body 22, and a shaft 24. In the ultrasonic motor 20, the vibration body 21 vibrates based on the drive signal received from the drive unit 10, the vibration is transmitted by friction, and the moving body 22 rotates. As the moving body 22 rotates, the shaft 24 rotates.
[0026]
The output display unit 40 is fixed to the shaft 24 of the ultrasonic motor 20, and when the shaft 24 rotates, the output display unit 40 also rotates. The position detection unit 30 is arranged so as not to overlap the output display unit 40, detects the current position of the output display unit 40, and supplies a position signal corresponding to the position to the drive unit 10. The drive unit 10 calculates the current position of the output display unit 40 based on the position signal, and supplies a drive signal in consideration of the position to the ultrasonic motor 20.
[0027]
As described above, in the rotating device 1, since the position detection unit 30 is arranged side by side with the output display unit 40, that is, without being overlapped with the driving unit 10 and the output display unit 40, the rotating device can be thinned. In addition, although the ultrasonic motor was mentioned as an example in the above, the same effect can be acquired also by a normal motor. The above is the concept of the rotating device according to the present invention. An example in which these are embodied will be described below.
[0028]
2A is a cross-sectional view showing a case where the rotating device 100 is applied to a traveling speed meter of a car, and FIG. 2B is a plan view. The stator 91 has a piezoelectric element spread on the back surface thereof, and the surface of the piezoelectric element is subjected to polarization treatment (both not shown). The stator 91 is provided with a plurality of projections 92 for taking out the output. A rotation shaft 93 is provided at the center of the stator 91. The rotor 94 rotates about this rotation axis. The rotor 94 is integrated with the indicator needle 95, and further, a rotary slit plate 96 is formed at the rear end thereof (see FIG. 4B). The rotational position of the rotary slit plate 96 is detected by a position detection sensor 97.
[0029]
The stator 91 and the projection 92 are provided on the vibrating body 21 shown in FIG. 1, the rotor 94 is provided on the moving body 22 shown in FIG. 1, the position detection sensor 97 is provided on the position detection unit 31 shown in FIG. Corresponds to the output display unit 40 shown in FIG.
[0030]
The position detection sensor 97 detects the current position of the rotary slit plate 96, calculates the current position of the pointing needle 96 from the position, and sends a position signal corresponding to the position of the pointing needle 96 to a drive circuit (not shown). Output. The drive circuit supplies the stator 91 with a drive signal based on the change amount signal corresponding to the traveling speed of the vehicle and the position signal from the position detection sensor 97. The position detection sensor 97 detects the current position of the rotary slit plate 97 using light, magnetism, or mechanical contact.
[0031]
Based on this drive signal, the stator 91 and the protrusion 92 vibrate, and the rotor 94 rotates due to friction with the protrusion 92. As a result, the indicating needle 95 rotates to a position representing the traveling speed of the vehicle. Further, the rotary slit plate 96 also rotates in conjunction with the indicator needle 95. In FIG. 2, the index plate is omitted.
[0032]
As described above, in the rotating device 100 according to the first embodiment, the drive unit 10 (the stator 91 and the rotor 94) and the output display unit 40 (the indicating needle 95) do not overlap with the position detection unit 30 (the position detection sensor 97). Therefore, it is not necessary to secure a space for arranging the position detection unit 30, and the rotating device 100 can be made thin.
[0033]
In FIG. 2, the position detection sensor 97 is U-shaped and the end of the rotary slit plate 96 is positioned in the concave portion. However, the rotational position is determined using the thickness of the end of the rotary slit plate 96. If it detects, it can arrange | position so that the position detection sensor 97, the rotary weight, and the board 96 may not overlap. For this reason, it is possible to make the rotating device 100 thinner.
[0034]
In the above description, the present invention is described as being used in a vehicle travel speed meter. However, the present invention can be applied to all electronic devices that display or output a predetermined value by swinging. In addition, although an explanation has been given of using an ultrasonic motor to rotate the output display unit, a normal electric motor or other motors may be used. Moreover, although the shaft 24 is provided on the moving body 22 and the output display unit 40 is fixed to the shaft 24, the output display unit 40 may be directly attached to the moving body 22.
[0035]
[Embodiment 2]
FIG. 3 is a cross-sectional view showing a rotating device using the ultrasonic motor according to Embodiment 2 of the present invention. FIG. 4 is a plan view showing the rotating device shown in FIG. 3 and 4, reference numeral 50 denotes a support base, and reference numeral 60 denotes a shaft fixed to the support base 50. Reference numeral 52 denotes a stator, and the stator 52 has a protrusion 53. Reference numeral 51 denotes a lead substrate that transmits a drive signal. Reference numeral 54 denotes a rotor supported by the shaft 60. An indicator needle 55 and a rotary slit plate 56 are fixed to the rotor 54. The rotary slit plate 57 is semicircular, and a plurality of slits S are formed in the rotary slit plate 57 at predetermined intervals.
[0036]
The rotor 54 is pressed against the protrusion 53 of the stator 52 by a spring 58 and a screw 59. Reference numeral 61 denotes a bearing that rotatably supports the rotor 54 around the shaft 60. The position detection sensor 57 detects the position of the rotary slit plate 56. The position detection sensor 57 is U-shaped, and the end of the rotary slit plate 56 is disposed in the concave portion of the detection sensor 57. The position detection sensor 57 has a light emitting element on one side of the rotary slit plate 56 and a light receiving element on the other side, and detects the light passing through the slit S of the rotary slit plate 56 to determine the rotational position.
[0037]
Since the indicator needle 55 and the rotary slit plate 56 are fixed to the rotor 54, the position of the indicator needle 55 can be determined from the position of the rotary slit plate 56. Therefore, the position detection sensor 57 supplies a position signal corresponding to the position of the pointing hand 55 to a drive circuit (not shown). In this embodiment, since the rotary slit plate 56 is semicircular, the rotation angle of the indicating needle 55 is 0 ° to 180 °. Here, the rotation angle may be increased or decreased by increasing or decreasing the opening angle of the rotating slit plate.
[0038]
The drive circuit (not shown) supplies the stator 52 with a drive signal based on a change amount signal corresponding to the traveling speed of the vehicle and a position signal from the position detection sensor 57. Based on this drive signal, the stator 52 and the protrusion 53 vibrate, and the rotor 54 rotates about the shaft 60 by friction with the protrusion 53. As a result, the indicator hand 55 rotates to a position representing the traveling speed of the vehicle. Further, the rotary slit plate 56 rotates in conjunction with the indicator needle 55. In FIG. 3, the index plate is omitted.
[0039]
As described above, in the rotating device 2 according to the second embodiment, since the pointing needle 55 and the position detection sensor 57 are arranged so as not to overlap, it is not necessary to secure a space for arranging the position detection sensor 57. . For this reason, the rotating device 2 can be made thin.
[0040]
[Embodiment 3]
FIG. 5 is a cross-sectional view showing a rotating device using an ultrasonic motor according to Embodiment 3 of the present invention. FIG. 6 is a plan view showing the rotating device shown in FIG. In the rotating device 3, the indication needle 55 and the rotating slit plate 66 are stacked. As shown in FIG. 6, the rotary slit plate 66 is circular, and a plurality of slits S are formed in the rotary slit plate 66 at a predetermined interval. In the rotation device 3 according to the third embodiment, since the rotation slit plate 66 is circular, the rotation angle of the indicating needle 55 can be made larger than that of the rotation device according to the second embodiment. Since the configuration other than this is the same as that of the rotating device 2 of the second embodiment shown in FIGS. 3 and 4, the description thereof is omitted.
[0041]
[Embodiment 4]
FIG. 7 is a cross-sectional view showing an electronic apparatus using the rotating device of the present invention. FIG. 8 is a plan view showing the electronic device shown in FIG. The electronic device 4 includes a rotating device 5 and a light emitting unit 77.
[0042]
7 and 8, reference numeral 50 denotes a support base, and reference numeral 60 denotes a shaft fixed to the support base 50. Reference numeral 52 denotes a stator, and the stator 52 has a protrusion 53. Reference numeral 51 denotes a lead substrate that transmits a drive signal. Reference numeral 54 denotes a rotor supported by the shaft 60. A plate 75 is fixed to the rotor 54. The plate 75 is circular, and a plurality of through holes H having different sizes are formed in one half, and a plurality of slits S are formed at a predetermined interval in the other half.
[0043]
The rotor 54 is in pressure contact with the protrusion 53 of the stator 52 by a spring 58 and a screw 59. Reference numeral 58 denotes a bearing that rotatably supports the rotor 54 about an axis 60.
[0044]
Reference numeral 57 denotes a position detection sensor, and the position detection sensor 57 detects the position of the plate 75. The position detection sensor 57 is U-shaped, and the end of the plate 75 is positioned in the concave portion of the position detection sensor 57. The position detection sensor 57 has a light emitting element on one side of the plate 75 and a light receiving element on the other side, and determines the position of the plate 75 by detecting light passing through the slit S of the plate 75. The position detection sensor 57 detects the position of the plate 75 and supplies a position signal corresponding to the position to a drive circuit (not shown).
[0045]
A light emitting unit 77 is provided on one side of the plate 75. The light from the light emitting part 77 passes through the through hole H of the plate 75. In order to adjust the light from the light emitting unit 77, the predetermined through hole H is selected by rotating the plate 75. Since the rotation amount of the plate 75 can be controlled by the slit S, the through hole H can be selected based on a selection signal from the drive circuit.
[0046]
The electronic device 4 can be used for, for example, eye inspection and optical communication. As described above, in the electronic device 4 of the fourth embodiment, the thin electronic device 4 can be thinned by using the thin rotating device 5.
[0047]
【The invention's effect】
As described above, in the rotating device with a position detection device according to the present invention (claims 1 and 2), the position detection means is not overlapped with the drive means or the output display means, and therefore the position detection means is arranged. There is no need to secure space. For this reason, the whole rotation apparatus can be made thin.
[0048]
In the rotation device with a position detection device of the present invention (Claim 3), since the output display means and the interlocking rotation means are integrated substantially in a plane, the entire rotation device can be further thinned. Further, since the number of parts can be reduced, the structure is simplified.
[0049]
In the rotation device with a position detection device of the present invention (Claim 4), the position of the interlocking rotation means is detected using light, magnetism or a mechanical contact as the position detection means. The position of the means can be detected accurately and easily.
[0050]
Further, in the rotation device with a position detection device according to the present invention (Claim 5), a rotation slit plate is provided at the opposite end of the indicator needle, and the rotation position of the rotation slit plate is detected by the position detection means. There is no need to place the position detecting means on the rotating means.
[0051]
In the rotation device with a position detection device of the present invention (Claim 6), a rotation slit plate is provided at the opposite end of the indicator needle, and the rotation position of the rotation slit plate is detected by the position detection means. There is no need to place the position detecting means on the rotating means. For this reason, the apparatus can be thinned. Further, since an ultrasonic motor including a driving body and a moving body is used as the rotating means, the apparatus can be further reduced in thickness.
[0052]
Further, in the electronic device according to the present invention (Claim 7), a position signal is obtained from the rotation means with the position detection device and the position detection means of the rotation means with the position detection device, and the rotation means with the position detection device is rotated. Since the rotation control means for controlling is provided, the electronic device itself can be made thinner as the rotation means with position detecting device is made thinner.
[Brief description of the drawings]
FIG. 1 is a conceptual explanatory view showing a rotating device using an ultrasonic motor according to Embodiment 1 of the present invention.
2A is a cross-sectional view showing a case where the rotating device 100 is applied to a travel speed meter of a car, and FIG. 2B is a plan view.
FIG. 3 is a cross-sectional view showing a rotating device using an ultrasonic motor according to a second embodiment of the present invention.
4 is a plan view showing the rotating device shown in FIG. 3. FIG.
FIG. 5 is a cross-sectional view showing a rotating device using an ultrasonic motor according to a third embodiment of the present invention.
6 is a top view showing the rotating device shown in FIG. 5. FIG.
FIG. 7 is a cross-sectional view showing an electronic apparatus using the rotating device of the present invention.
8 is a plan view showing the electronic device shown in FIG.
FIG. 9 is a conceptual explanatory view showing a rotating device using a conventional ultrasonic motor.
FIG. 10 is a cross-sectional view showing a case where the rotating device is used for a travel speed meter of a car.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 100 Rotating device 91 Stator 92 Projection 93 Rotating shaft 94 Rotor 95 Pointer needle 96 Rotating slit plate 97 Position detection sensor

Claims (7)

Output display means for displaying or outputting a predetermined value by rotating around an axis, drive means for rotationally driving the output display means, and detecting the position of the output display means according to the position In a rotation device with a position detection device having position detection means for outputting a position detection signal,
An interlocking rotating means that rotates in conjunction with the output display means is provided, the position detecting means is disposed at a position that does not overlap the driving means or the output display means, and the position of the interlocking rotating means is detected by the position detecting means. A rotation device with a position detection device, characterized in that it is configured as described above. Output display means for displaying or outputting a predetermined value by rotating around an axis, drive means for rotationally driving the output display means, and detecting the position of the output display means according to the position position with a position detecting means for outputting a position detection signal, and a drive signal supplying means for performing rotation control of said drive means by a drive signal based on said position signal and the signal receiving a signal corresponding to a predetermined change amount In the rotation device with the detection device ,
An interlocking rotation means that rotates in conjunction with the output display means;
The position detection means is arranged on the opposite side of the output display means around the axis so as not to overlap the drive means or output display means,
The position detecting device detects the position of the interlocking rotating device, and supplies a position signal corresponding to the position to the drive signal supplying device.   The rotation device with a position detection device according to claim 1, wherein the output display unit and the interlocking rotation unit are integrated in a substantially planar manner.   The said position detection means detects the position of the said interlocking rotation means using light, a magnetism, or a mechanical contact, The rotation apparatus with a position detection apparatus as described in any one of Claims 1-3 characterized by the above-mentioned. . A rotating means having a rotor and a stator;
An indicator needle provided on the rotor shaft;
A rotating slit plate provided at the opposite end of the indicator needle with respect to the rotor shaft and rotating in conjunction with the indicator needle;
And a position detecting means for detecting the rotational position of the rotating slit plate. A drive unit provided with a projection for output extraction on one surface, and a piezoelectric body spread on the other surface and subjected to polarization treatment on the piezoelectric body;
A moving body arranged to contact the protrusion;
An indicator needle provided on the moving body;
A rotating slit plate provided at the opposite end of the indicator needle with respect to the center of rotation and rotating in conjunction with the indicator needle;
Position detecting means for detecting the rotational position of the rotary slit plate;
A rotation device with a position detection device. The position detection device according to any one of claims 1 to 6 and a position signal from a position detection means of the rotation device with the position detection device are acquired, and the rotation of the rotation device with the position detection device is controlled. An electronic device comprising rotation control means.

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