JPH0594713U - Rotation detector - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rotation detecting device which improves the reliability of the detected value, downsizes the entire device, and facilitates maintenance of the device. Constitution: A skirt portion 30 is provided on a dial knob 3, transparent slits 31 are arranged in the skirt portion at regular intervals, and a projector 5 for detecting passage of the slit 31 with the skirt portion sandwiched therebetween.
Two pairs of optical sensors including a and a light receiver 5b, and a light projector 6a and a light receiver 6b are provided. In addition, dial knob 3
There is provided a shutter 7 that rotates in the same direction as the dial knob 3 by the rotation of, and a stopper 9 that blocks the rotation of the shutter 7 at a predetermined position. By rotating the dial knob 3, the shutter 7 is positioned between one of the light emitters (5a or 6a) and the light receiver (5b or 6b), and an optical sensor is selectively used for each rotation direction to detect a detection value for each rotation direction. Is output.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a rotation detecting device for detecting a rotation direction, a rotation angle, and a rotation speed of a rotating body, and in particular, an output signal representing the rotation angle and the rotation speed can be obtained from an output terminal which differs depending on the rotation direction. The present invention relates to a rotation detection device.

[0002]

[Prior Art]

 As shown in FIG. 6, in the conventional rotation detecting device, a dial knob 52 is rotatably attached to a substrate 51 via a rotary shaft 53. On the rotary shaft 53, a rotary plate 55 which rotates concentrically with the dial knob 52 is provided at a predetermined distance from the substrate 51. A contact 57 for reading a pattern formed on the substrate 51, which will be described later, is provided at a predetermined position on the surface of the rotating plate 55 facing the substrate 51. In FIG. 6, 58 is a dustproof cover surrounding the rotating plate 55 and the like, and 59 is a casing.

On the side of the substrate 51 facing the rotary plate 55, there are provided first and second contact portions A and B which project in a circular direction at a predetermined equal pitch as shown in FIG. Two second contact patterns 71 and 72 are concentrically formed and a third contact pattern 73 for applying a common voltage (V). In the first and second contact patterns 71 and 72, the pitches of the contact portions A and B are set to an equal angle (45 ° in FIG. 7), and the contact portions A and B do not completely coincide with each other in the radial direction. (It is shifted by 15 ° in Fig. 7).

First to third contacts (not shown) are arranged on the rotary plate 55 in a radial direction from the inner side to the outer side, and the locus shown in FIG. 7 is shown in accordance with the rotation of the dial knob 52. The substrate 51 is contacted so as to draw 74, 75, and 76. That is, the two contacts on the inner peripheral side, that is, the first and second contacts, intermittently contact the contact portions A and B, respectively, and the contact on the outermost peripheral side, that is, the third contact, is always the third contact. Touch the dot pattern 73. The first and second contacts are electrically connected to the third contact, respectively. When the first and second contacts come into contact with the contact parts A and B, respectively, the first output terminal Output signals are output to 77 and the second output terminal 78, respectively. The output is shown in FIG.

Since the contact portion A and the contact portion B are displaced so as not to completely coincide in the radial direction, a contact phase difference is generated between the first contact and the second contact, and the output thereof is the dial. There is a difference between when the knob 52 is turned clockwise and when it is turned counterclockwise. That is, ON and OFF of the outputs of the first and second output terminals 77 and 78 are represented by "1" and "0", respectively, and the output of the first output terminal 77 is represented by the first digit of the binary system and the second digit. Assuming that the output of the output terminal 78 of is the second digit, it becomes 10 → 01 → 11 → 10 → 01 → 11 → ... at the time of clockwise rotation (rightward), and counterclockwise (leftward). When rotating to (), the signal flow differs from 10 → 11 → 01 → 10 → 11 → 01 → ・ ・, and the rotation direction of the dial knob 52 can be determined. In addition, the amount of rotation and the rotation speed can be known from the number of changes and the speed of change of the output.

[0006]

[Problems to be solved by the device]

 However, if the conventional rotation detecting device as described above is used to detect the rotation direction and the like, chattering is likely to occur at the time of rising because of the contact method, which leads to misreading and there is a problem in reliability.

Further, in the case of forming the pattern as described above, there is also a problem that a large space is required around the rotation axis, and the device is inevitably large as a whole.

Further, a dustproof cover or the like is required to prevent dust from entering between the contact and the pattern, which also makes the device large.

Further, in the case of the contact type, the parts in contact with each other are apt to be worn out, and there is a problem in respect of maintenance of the device.

The present invention has been proposed in view of the above-mentioned problems of the prior art, and provides a rotation detection device that improves the reliability of detection values, downsizes the entire device, and facilitates maintenance of the device. With the goal. It is another object of the present invention to provide a rotation detecting device that can obtain an output signal indicating a rotation speed and a rotation amount from different output terminals according to a rotation direction of a rotating body.

[0011]

[Means for Solving the Problems]

 According to the present invention, a rotator having a skirt portion extending in the circumferential direction and transparent slits formed in the skirt portion at regular intervals, and a projector provided with the skirt portion sandwiched therebetween. And a light receiver, and an optical sensor for detecting the passage of the transparent slit, and a rotation direction detecting means for detecting the rotation direction of the rotating body are obtained.

Further, two pairs of the optical sensors are provided at positions spaced apart from each other in the circumferential direction of the rotating body, and the rotation direction detecting means is provided with the two pairs of optical sensors depending on the rotating direction of the rotating body. A rotation detecting device characterized in that either one of the optical sensors is selected is obtained.

[0013]

[Action]

 According to this invention, the rotation direction of the rotating body is detected by the rotation direction detector. Then, the optical sensor detects the number of passages and the passage velocity of the slit or wall surface of the rotating body, and outputs this information.

When two optical sensors are provided and different optical sensors are used depending on different rotation directions, the rotation direction detecting means detects the rotation direction in advance, and the optical sensor corresponding to the rotation direction is detected. The number of passages and the passage speed of the slit or the wall surface portion of the rotating body are detected by the type sensor, and a signal is output based on the detection information.

[0015]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, in the rotation detecting device of the present invention, a dial knob 3 is rotatably provided on a substrate 1 via a cylindrical holder 2. For example, the dial knob 3 is formed with an opening at the top in order to expose the multi-function push switch 4. However, if it is not necessary to provide such a push switch 4, it is not necessary to form the opening.

As best seen in FIG. 2, the dial knob 3 is formed with a large-diameter skirt portion 30 that hangs downward in the entire circumference. The skirt portion 30 has slits 31 formed at equal intervals in the circumferential direction. The intervals between the slits are, for example, 15 ° around the center of rotation of the dial knob 3.

Referring to FIG. 1 again, light projectors 5 a and 6 a are provided on the substrate 1 and outside the skirt portion 30. The installation positions of the two light projectors 5a and 6a are not particularly limited, but in the figure, the angle formed by the optical axes emitted from the respective light projectors 5a and 6a is 30 ° at the rotation center of the dial knob 3. It is installed so that Light receivers 5b and 6b are provided inside the skirt portion 30 so as to face the light projectors 5a and 6a, respectively, in the direction from the light projectors 5a and 6a toward the center of rotation of the dial knob 3.

A shutter 7 is provided between the skirt portion 30 of the dial knob 3 and the light projectors 5a and 6a. This shutter 7 is for preventing the light emitted from one of the light projectors from reaching the corresponding light receiver, and the holding portion 70 is placed on the outer periphery of the dial knob 3. When the dial knob 3 is rotated, the shutter 7 is also rotated in the dial knob rotation direction due to friction with the dial knob 3. At this time, the shutter 7 needs to be stopped when it is positioned in front of the one light-shielding side projector so as to block the light emitted from the one projector. Therefore, the stoppers 9a and 9b are provided and the shutter 7 is moved between the stoppers 9a and 9b. The distance between the stoppers 9a and 9b and the dimension of the shutter 7 in the moving direction are such that when the shutter 7 is blocking the projection of one projector (for example, 6a as shown), the other projector (5a) is the receiver. It is necessary to set so that the light is projected toward 5b so that it is in the open state.

That is, when the dial knob 3 is rotated clockwise, as shown in FIG. 3, the shutter 7 hits the left stopper 9a and is prevented from rotating further. At this time, the shutter 7 is located in front of the left projector 6a so as to block the projection from the projector 6a and prevent it from reaching the light receiver 6b. At this time, since the right light projector 5a is not blocked by the shutter 7, the light projected from the light projector 5a reaches the light receiver 5b (the light receiver 5b is not shown in FIG. 3). When the dial knob 3 is rotated clockwise, one pulse is generated each time the slit 31 of the skirt portion 30 passes in front of the projector 5a, that is, every 15 ° of rotation angle.

On the contrary, when the dial knob 3 is rotated counterclockwise, as shown in FIG. 4, the shutter 7 contacts the right stopper 9b and is located in front of the right projector 5a. The light projected from 5a does not reach the light receiver 5b. At this time, since the projector 6a on the left side is not blocked by the shutter 7, the projection from the projector 6a reaches the light receiver 6b (the light receiver 6b is not shown in FIG. 4). When the dial knob 3 rotates counterclockwise, one pulse is generated each time the slit 31 of the skirt 30 passes in front of the projector 6a, that is, every 15 ° rotation angle.

Here, by using a phototransistor with a Schmitt trigger circuit on the light receiver side, it is possible to obtain a chattering-free rectangular wave as shown in FIG.

As described above, according to this invention, it is possible to obtain outputs from different sensors depending on the rotating direction of the dial knob. That is, in the above embodiment, one pulse can be generated every 15 ° from either one of the sensors 5 and 6 depending on the rotation direction. Therefore, for example, when it is used as a volume of a device connected to a microcomputer, the volume is lowered by 1 decibel for each pulse generated in the clockwise rotation without giving information indicating the rotation direction, and the counterclockwise direction is set. You can use it to raise the volume by one decibel each time one pulse is generated during rotation.

In the above-described embodiment, the shutter 7 detects the rotation direction of the dial knob 3, and the optical sensor on the downstream side in the rotation direction is inoperable. However, the present invention is not limited to this, and is configured to detect the rotation direction of the dial knob electrically or mechanically and disconnect the switch of one optical sensor. Good.

Further, although two optical sensors are used in the above description, the present invention is not limited to this, and only one optical sensor can be used to rotate in either the clockwise or counterclockwise direction. Alternatively, the rotation angle or the like may be detected. In this case, it can be easily achieved by outputting a rotation direction signal from a detector that detects the rotation direction and combining the rotation direction signal and the signal from the optical sensor.

Further, in the above-described embodiment, the light emitter and the light receiver are provided so as to face each other so that the light emitted from the light emitter passes through the slit and is received by the light receiver. However, the present invention is not limited to this. That is, both the light emitter and the light receiver are installed, for example, on the outer side of the skirt (on the side where the light emitters 5a and 6b are installed in FIG. 1), and the reflecting mirror is provided on the wall surface of the skirt (between the slits). Alternatively, the light from the light projector may be reflected on the wall surface before the light receiver receives the light. In this case, the light entering the slit does not reach the light receiver without being reflected.

[0026]

[Effect of the device]

 As described above, according to the present invention, since the rotation angle and the rotation speed are detected by the optical sensor, chattering does not occur and reliable information about the rotation angle and the rotation speed can be obtained.

Further, according to the present invention, the contact information is not contacted with each other to obtain the signal information but is detected by a non-contact type, so that the contact portion is not worn unlike the conventional one. Easy to maintain. Further, since it is not of the contact type as described above, it is possible to perform highly accurate detection that is not easily affected by dust and the like.

Further, since the structure of the present invention is simpler than that of the conventional one, the size can be reduced and the manufacturing cost can be reduced.

Furthermore, since two optical sensors are used, it is not necessary to include information indicating the rotation direction in the output signal, so that subsequent information processing becomes easy.

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view showing a rotation detecting device according to an embodiment of the present invention.

FIG. 2 is a perspective view of a dial knob used in the rotation detection device of FIG.

3 is an explanatory view of an operating state of the rotation detection device of FIG.
It is a perspective view showing a state when the dial knob is rotated clockwise.

FIG. 4 is an explanatory view of an operating state of the rotation detection device of FIG.
It is a perspective view which shows a state when rotating a dial knob counterclockwise.

5 is a timing chart showing an example of an output signal obtained in the rotation detection device of FIG.

FIG. 6 is a partially cutaway perspective view showing a conventional rotation detecting device.

FIG. 7 is a plan view showing an example of components of a conventional rotation detection device.

FIG. 8 is a timing chart of signal output obtained by a conventional rotation detection device.

[Explanation of symbols]

 1 substrate 2 holder 3 dial knob 4 push switch 5a light emitter 5b light receiver 6a light emitter 6b light receiver 7 shutter 30 skirt 31 slit 51 substrate 52 dial knob 55 rotating plate 57 contact 58 dust cover 71 first contact pattern 72 second Contact pattern 73 Third contact pattern 74 Trajectory of first contact 75 Trajectory of second contact 76 Trajectory of third contact 77 First output terminal 78 Second output terminal

Claims (3)

[Scope of utility model registration request] 1. A rotating body having a skirt portion extending in the circumferential direction, and transparent slits formed in the skirt portion at regular intervals, a projector arranged with the skirt portion interposed therebetween, and a light receiving device. And a rotation direction detecting means for detecting a rotation direction of the rotating body, and a rotation detecting device. 2. Two pairs of the optical sensors are provided at positions spaced apart from each other in the circumferential direction of the rotating body, and the rotation direction detecting means is the two pairs of optical sensors depending on the rotating direction of the rotating body. 2. The rotation detecting device according to claim 1, wherein one of the optical sensors is selected. 3. The rotation direction detecting means has a shutter that rotates in accordance with the rotation of the rotating body, and a stopper that stops the rotation of the shutter at a predetermined position, depending on the rotating direction of the rotating body. The rotation detecting device according to claim 2, wherein the rotation detecting device is located between the light projector and the light receiver of one of the two pairs of optical sensors.