JP2002157942A - Electronic dial - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce a detection error while reducing the installation interval of terminals of a brush in particular with a simple structure. SOLUTION: A conductive code plate 3 is installed on the upper face of a dial main body 2. The code plate 3 is provided with a ring section 31 and a plurality of contact sections 32 radially and linearly extending toward the outer peripheral direction from the ring section 31 as conductive sections. The brush 4 is provided with six terminals 41-46 arranged toward the outer peripheral side from the inner peripheral side of the dial main body 2. The terminals 45 and 46 are shorter in length than the terminals 43 and 44 located on the inner peripheral side. When the dial main body 2 is rotated CW, for example, the terminals 43 and 44 are first brought into contact with the contact sections 32, then the terminals 45 and 46 are brought into contact, and a signal A and a signal B are obtained in this order. When the dial main body 2 is rotated CCW, the signal B and the signal A are obtained in this order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic dial installed on an electronic device such as an electronic dial.

[0002]

2. Description of the Related Art As a dial, an electronic dial having a detection mechanism capable of detecting a rotation direction and a rotation amount is known.

This electronic dial has a dial body rotatably supported, a code plate formed on the dial body, and a brush having a plurality of pin-shaped terminals whose tips can come into contact with the code plate. I have.

The code plate has a pattern having a plurality of contact portions radially arranged at equal angular intervals from the center of rotation of the dial body. Each contact portion is bent in a crank shape in the middle, while each terminal of the brush is all the same length, whereby when the dial body rotates in a predetermined direction, the contact portion is bent from the bent portion of the contact portion. Time difference (phase difference) between the terminal on the inner peripheral side and that on the outer peripheral side with respect to the terminal
It is configured to contact with. However,
The electronic dial having such a configuration has the following disadvantages.

[0005] Although the brush is fixed at a predetermined position, the mounting position may be displaced at the time of assembling or the like due to variations in the accuracy of parts. When this displacement occurs, for example, a terminal that should originally contact a part on the inner peripheral side (inner peripheral part) from the bent part of the contact part is different from a part (outer peripheral part) on the outer peripheral side from the bent part of the contact part. May come in contact.
When such a situation occurs, when the electronic dial is rotated in a certain direction, a signal having a time difference cannot be obtained, and a detection error occurs.

In particular, recently, with the miniaturization of electronic equipment, it has been demanded that the distance between the terminals of the brush be narrower. Therefore, even if the position of the brush is slightly displaced, the above-mentioned inconvenience can be avoided. It is easy to occur.

In order to prevent the displacement of the brush from being fixed, it is necessary to increase the number of fixing points and to increase the accuracy of parts and the mounting accuracy, which is an obstacle to miniaturization.

[0008]

SUMMARY OF THE INVENTION An object of the present invention is to provide an electronic dial having a simple structure and a small number of detection errors.

[0009]

This and other objects are achieved by the present invention which is defined below as (1) to (6).

(1) A dial body rotatably supported by a base and a contact portion installed on the dial body and extending linearly from the center of the dial body toward the outer periphery are radially arranged at equal angular intervals. And a brush having a plurality of pin-shaped terminals whose tips can come into contact with the code plate, wherein one of the terminals and the other terminal have different lengths. An electronic dial, wherein when the dial body is rotated in a predetermined direction, the terminals having different lengths contact the code plate with a time lag.

As a result, it is possible to provide an electronic dial which has a simple structure and has few detection errors, and an electronic dial which can contribute to downsizing.

(2) The electronic dial according to (1), which has a function of detecting a rotation direction and a rotation amount of the dial body. Thereby, the use of the electronic dial can be expanded.

(3) The electronic dial according to (1) or (2), wherein the brush has at least one terminal that is always in contact with the code plate.

Thus, the terminal which is always in contact with the code plate can be used as the ground, and the detection circuit can be simplified.

(4) The electronic dial according to any one of (1) to (3), wherein the brush is supported at one to three fixed points.

Thus, the structure of the brush fixing portion can be made simpler, which further contributes to downsizing.

(5) The electronic dial according to any one of the above (1) to (4), further comprising positioning means for positioning a rotational position of the dial body.

Thus, the operator of the dial can intuitively grasp the amount of rotation of the dial.

(6) The electronic dial according to (5), wherein the positioning means is a click mechanism.

Thus, the operator of the dial can more easily and accurately grasp the amount of rotation of the dial by a click feeling.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an electronic dial according to the present invention will be described in detail based on preferred embodiments shown in the accompanying drawings.

FIG. 1 is a plan view showing an embodiment of an electronic dial according to the present invention, FIG. 2 is a plan view showing a state in which a brush is displaced in the electronic dial shown in FIG. 1, and FIG. FIG. 4 is a plan view showing the shape of the code plate in the electronic dial shown in FIG. 1, and FIG. 4 is a sectional side view of the electronic dial shown in FIG. In the following description, the upper side in FIG. 4 is referred to as “upper”, and the lower side is referred to as “lower”.

As shown in FIGS. 1 to 4, the electronic dial 1 is used by being installed on a camera such as a film camera, an electronic camera, a video camera, etc., and has a function of detecting the direction of rotation and the amount of rotation. Things.

The electronic dial 1 has a dial body 2, a code plate 3 installed on the upper surface of the dial body 2, and a brush 4 having a plurality of terminals 41 to 46 that can contact the code plate 3. I have.

The dial body 2 has a substantially disk shape, and a rotary shaft 21 extending in the vertical direction is provided at the center thereof. The dial main body 2 is installed so as to be rotatable with respect to the base 100 by the rotation shaft 21 (see FIG. 4).

The dial body 2 is formed of an insulating material such as various resin materials.

The base 100 is composed of an upper plate 110 and a lower plate 120, and in a space 130 formed therebetween,
The dial body 2 is housed. A shaft hole is formed in each of the upper plate 110 and the lower plate 120, and the rotation shaft of the dial body 2 is inserted into the shaft hole, and the dial body 2 is rotatably supported.

The outer peripheral portion of the dial body 2 is exposed to the outside of the space 130 on the near side or the far side of the paper surface in FIG. 4, and the dial body 2 can be rotated by touching the exposed portion with a finger.

The outer periphery of the dial body 2 is formed with knurls (knurls) 22 for exerting an anti-slip function when the electronic dial 1 is rotated with a finger. A finger can be applied to this portion to rotate the dial body 2 clockwise or counterclockwise.

A code plate 3 made of a conductive material is provided on the upper surface of the dial body 2. Hereinafter, the pattern shape of the code plate 3 will be described.

The conductive portion of the code plate 3 is indicated by hatching in FIG. This conductive portion is made of a metal layer formed by, for example, nickel plating or gold plating, and forms a conductive pattern having conductivity. The portions other than those indicated by oblique lines are non-conductive portions (insulating portions).

As shown in FIG. 3, the code plate 3 serves as a conductive portion and has a rotating shaft 2 at a central portion thereof so as to surround the rotating shaft 21.
1 has a ring-shaped ring portion 31 concentrically arranged, and a plurality of contact portions 32 are radially arranged from the ring portion 31 toward the outer peripheral direction.

Each contact portion 32 extends substantially linearly toward the outer periphery of the dial body 2. Further, the contact portions 32 are arranged at equal angular intervals, and in the configuration shown in the drawing, nine contact portions 32 are arranged at 40 ° intervals.

The brush 4 has a plurality of pin-shaped terminals 41 to 46 each having a contact at the tip thereof that can come into contact with the code plate 3, and a support member 47 for supporting these terminals. In this embodiment, a total of six terminals 41 to 46 are provided, and the terminals 41, 4 are arranged from the inner peripheral side to the outer peripheral side of the dial body 2.
2, 43, 44, 45 and 46 are arranged substantially parallel in this order.

Each of the terminals 41 to 46 is made of a metal material and is elastically deformable. Due to the elasticity of each of the terminals 41 to 46, the contacts at the tips thereof are pressed against the code plate 3.

The terminal 41 and the terminal 42 are connected (electrically connected) at their base ends, and perform the same function.

Similarly, the terminal 43 and the terminal 44 are connected (electrically connected) at their base ends, and perform the same function.

Similarly, the terminal 45 and the terminal 46 are connected (electrically connected) at their base ends, and perform the same function.

As described above, by providing a pair of terminals having the same function, even if one of the pair of terminals has a poor contact with the code plate 3 due to, for example, adhesion of dust, the other terminal can be used. The terminal comes into contact with the code plate 3, and a detection error can be prevented.

The terminals 41 and 42 make a ground and are in constant contact with the ring portion 31 of the code plate 3.

The terminals 43 to 46 are all connected to the terminal 41,
This terminal is a terminal on which a positive charge acts on 42, and intermittently contacts the contact portion 32 of the code plate 3 when the dial body 2 rotates. In this case, the terminals 45, 46
Is shorter than the length of the terminals 43 and 44 on the inner peripheral side.

The dial body 2 is moved from the state shown in FIG.
When rotating clockwise, first, the terminals 43 and 44 come into contact with one contact portion 32 of the code plate 3 almost simultaneously. Here, since the terminals 41 and 42 are always in contact with the ring portion 31 of the code plate 3, the terminals 41 and 42 and the terminals 43 and 44
Are conducted through the code plate 3, and a signal (pulse signal) A corresponding to this is obtained.

Next, when the rotation of the dial body 2 further proceeds, the terminals 45 and 46 having short lengths come into contact with the contact portions 32 of the code plate 3 with a time lag. Similarly, terminal 41,
Since 42 is always in contact with the ring portion 31 of the code plate 3, the terminals 41, 42 and the terminals 45, 46 conduct through the code plate 3, and a signal (pulse signal) B corresponding thereto is obtained. .

As described above, when the signal input is detected in the order of the signal A and the signal B, it is detected that the dial body 2 has rotated clockwise in FIG.

When the dial body 2 is further rotated clockwise in FIG. 1, the terminal 43 is connected to the next adjacent contact portion 32.
The terminal 44 and the terminals 45 and 46 come into contact with a time difference in this order, and the signal input is detected in the order of the signal A and the signal B as described above.

The number of obtained signals A (or the number of signals B)
Is counted, the rotation amount (rotation angle) of the dial body 2 is detected. For example, when the number of the obtained signals A is nine, the dial body 2 has rotated substantially one clockwise in FIG.

The dial body 2 is moved from the state shown in FIG.
When rotating counterclockwise, first, short terminal 4
5 and 46 almost simultaneously contact one contact portion 32 of the code plate 3. Here, since the terminals 41 and 42 are always in contact with the ring portion 31 of the code plate 3, the terminals 41 and 42 and the terminals 45 and 46 conduct through the code plate 3, and a signal (pulse) corresponding thereto Signal) B is obtained.

Next, when the rotation of the dial body 2 further proceeds, the terminals 43 and 44 come into contact with the contact portions 32 of the code plate 3 with a time lag. Similarly, since the terminals 41 and 42 are always in contact with the ring portion 31 of the code plate 3,
1, 42 and the terminals 43, 44 are conducted through the code plate 3, and a signal (pulse signal) A corresponding to this is obtained.

As described above, when the signal input is detected in the order of the signal B and the signal A, it is detected that the dial body 2 has rotated counterclockwise in FIG.

When the dial body 2 further rotates counterclockwise in FIG. 1, the terminal 4 contacts the next adjacent contact portion 32.
5, 46 and the terminals 43, 44 come into contact with a time difference in this order, and the signal input is detected in the order of the signal B and the signal A in the same manner as described above.

The number of obtained signals A (or the number of signals B)
Is counted, the rotation amount (rotation angle) of the dial body 2 is detected. For example, when the number of the obtained signals A is nine, the dial body 2 has rotated substantially one counterclockwise in FIG.

As described above, the direction and amount of rotation of the dial body 2 can be detected.

The brush 4 has a substantially rhombic plate-like support member 47 for supporting the terminals 41 to 46. The brush 4 is fixed to the upper plate 110 of the base 100 by the support member 47. The support member 47 is made of an insulating material such as various resin materials.

The support member 47 has pins 48 and 49 protruding at both ends thereof. on the other hand,
The upper plate 110 is formed with two holes into which the pins 48 and 49 can fit, and the support members 47 are fixed by fitting the pins 48 and 49 into these holes. That is, the brush 4 is fixed to the base 100 at two fixing points formed on the support member 47.

In the present invention, it is needless to say that the shape of the fixing portion is not particularly limited.
From the viewpoint that the structure of the fixing part can be simplified, it is preferable that the fixing part is fixed at one to three fixing points.

The electronic dial 1 has a click mechanism 5 as positioning means for positioning the rotational position of the dial body.

The click mechanism 5 includes a ring-shaped click plate 51 fixed (fitted) to the lower surface of the dial body 2,
It comprises a ball 53 and a spring 54 for urging the ball 53 upward in FIG.

The click plate 51 is arranged concentrically with the rotating shaft 21, and a plurality of dish-shaped recesses 52 into which a part of the ball 53 can be inserted are formed on the lower surface thereof. This recess 5
2 are arranged at regular intervals along the circumferential direction of the click plate 51, that is, for example, nine concave portions 52 are arranged at regular intervals.

The lower plate 120 of the base 100 has a columnar hole 150 formed therein. The hole 150 is arranged so that the upper end opening thereof faces the click plate 51. In the hole 150, a ball 53 and a coil-shaped spring 54 for urging the ball 53 so as to press it against the click plate 51 are provided.

With the click mechanism 5 having such a configuration,
When the dial body 2 is rotated clockwise or counterclockwise, a part of the ball 53
2 and the circumferential position of the dial body 2 is positioned with a relatively small force. Therefore, when adjusting the electronic dial 1 by rotating the dial main body 2, a sense of moderation due to a click feeling can be obtained, and a desired amount of rotation can be easily obtained.

Next, the operation and effect of the electronic dial 1 will be described. First, an electronic dial 6 of a comparative example will be described in order to easily explain the operation and effect of the electronic dial 1 of the present invention.

FIG. 5 is a plan view showing the electronic dial 6 of the comparative example, FIG. 6 is a plan view showing a state in which the brush 8 has shifted in the electronic dial 6 shown in FIG. 5, and FIG. FIG. 6 is a plan view showing a shape of a code plate 7 in the electronic dial 6 shown in FIG. These FIGS. 5, 6 and 7
Correspond to FIG. 1, FIG. 2 and FIG. 3, respectively.

The electronic dial 6 of the comparative example is the same as the electronic dial 1 except that the shapes of the terminals 81 to 86 of the code plate 7 and the brush 8 are different.

As shown in FIG. 7, the code plate 7 of the electronic dial 6 of the comparative example has a conductive portion at the center thereof.
It has a ring-shaped ring portion 71 arranged concentrically with the rotating shaft 21 so as to surround the rotating shaft 21, and a plurality of contact portions 72 are radially arranged at equal angular intervals from the ring portion 71 toward the outer peripheral direction. (40 ° intervals).

Each contact portion 72 extends toward the outer peripheral direction of the dial main body 2, but is bent in a crank shape on the way. That is, each contact portion 72 has an inner peripheral portion 72a on the inner peripheral side and an outer peripheral portion 72b on the outer peripheral side with the bent portion as a boundary.

On the other hand, the brush 8 has a plurality of pin-shaped terminals 81 to 86 each having a contact at its tip which can come into contact with the code plate 7.
And a support member 87 similar to the above for supporting these terminals.
And Each of the terminals 81 to 86 is made of a metal material and is elastically deformable. Due to the elasticity of each of the terminals 81 to 86, the contacts at the tips thereof are pressed against the code plate 7. Each of the terminals 81 to 86 has the same length.

The terminals 81 and 82 form a ground and are in constant contact with the ring 71 of the code plate 7.

The terminals 83 to 86 are all
The terminal 82 has a positive charge acting on the terminal 82 and makes intermittent contact with the contact portion 72 of the code plate 7 when the dial body 2 rotates.

In the electronic dial 6, when the dial body 2 is rotated clockwise in FIG. 5 from the state shown in FIG. 5, first, the terminals 83, 84 are almost simultaneously connected to one contact portion 72 of the code plate 7. It comes into contact with the inner peripheral portion 72a. Here, since the terminals 81 and 82 are always in contact with the ring portion 71 of the code plate 7, the terminals 81 and 82 and the terminals 83 and 84 conduct through the code plate 7, and a signal (pulse) corresponding thereto. The signal A) is obtained.

Next, when the rotation of the dial body 2 further proceeds, the terminals 85 and 86 come into contact with the outer peripheral portion 72b of the contact portion 72 of the code plate 7 with a time lag. Similarly, terminal 8
Since the terminals 1 and 82 are in constant contact with the ring portion 71 of the code plate 7, the terminals 81 and 82 and the terminals 85 and 86 conduct through the code plate 7, and a signal (pulse signal) corresponding thereto.
B ′ is obtained.

As described above, when the signal input is detected in the order of the signal A 'and the signal B', the dial body 2 is thereby detected.
Is detected to rotate clockwise in FIG.

When the dial body 2 is further rotated clockwise in FIG. 5, the terminal 83
The terminal 84 and the terminals 85 and 86 come into contact with a time difference in this order, and the input of the signal is detected in the order of the signal A ′ and the signal B ′ as described above.

By counting the number of obtained signals A '(or the number of signals B'), the amount of rotation (rotation angle) of dial body 2 is detected. For example, when the number of the obtained signals A 'is 9, the dial body 2 has rotated substantially one clockwise in FIG.

The dial body 2 is moved from the state shown in FIG.
When rotating counterclockwise, first, the terminals 85 and 86 are almost simultaneously placed on the outer peripheral portion 72 of one contact portion 72 of the code plate 7.
Contact with b. Here, since the terminals 81 and 82 are always in contact with the ring portion 71 of the code plate 7, the terminals 81 and 82
And the terminals 85 and 86 are conducted through the code plate 7, and a signal (pulse signal) B 'corresponding thereto is obtained.

Next, when the rotation of the dial body 2 further proceeds, the terminals 83 and 84 come into contact with the inner peripheral portion 72a of the contact portion 72 of the code plate 7 with a time lag. Similarly, terminal 8
Since the terminals 1 and 82 are in constant contact with the ring portion 71 of the code plate 7, the terminals 81 and 82 and the terminals 83 and 84 conduct through the code plate 7, and a signal (pulse signal) corresponding to this.
A ′ is obtained.

As described above, when the signal input is detected in the order of the signal B 'and the signal A', the dial body 2 is thereby detected.
Is detected to rotate counterclockwise in FIG.

When the dial body 2 further rotates counterclockwise in FIG. 5, the terminal 8 contacts the next contact portion 72 adjacent thereto.
5, 86 and the terminals 83, 84 come into contact with a time difference in this order, and signal input is detected in the order of the signal B 'and the signal A' as described above.

By counting the number of obtained signals A '(or the number of signals B'), the amount of rotation (rotation angle) of the dial body 2 is detected. For example, if the number of the obtained signals A 'is 9, the dial body 2 has rotated substantially one turn in the counterclockwise direction in FIG.

As described above, the direction and amount of rotation of the dial body 2 can be detected.

The brush 8 has a support member 87 similar to the support member 47 for supporting the terminals 81 to 86, and is fixed to the base 100 by the support member 87.

The support member 87 has pins 88 and 89 projecting from both ends thereof, one by one, and is fixed by these pins 88 and 89. That is, the brush 8
It is fixed to the base 100 at two fixing points formed on the support member 87.

As shown in FIG. 6, in the electronic dial 6 as described above, for example, play occurs at a portion fixed by the pin 89, and the entire brush 8 including the support member 87 moves counterclockwise around the pin 88. (The direction indicated by the arrow in FIG. 6)
Is slightly shifted.

Then, when the dial body 2 rotates, the terminal 84, which should be in contact with the inner peripheral portion 72a of the contact portion 72, shifts in the outer peripheral direction and comes into contact with the outer peripheral portion 72b of the contact portion 72. You can no longer get the signal you put.

That is, when the dial body 2 is rotated counterclockwise in FIG. 6 from the state shown in FIG.
86 contacts the outer peripheral portion 72b of one contact portion 72 of the code plate 7, but at the same time, the terminal 84 also contacts the outer peripheral portion 72b of the contact portion 72, so that the signal B 'and the signal A' Will be obtained at the same time. For this reason, the rotation direction of the dial body 2 cannot be specified.

As described above, in the electronic dial 6 of the comparative example, a detection error may occur due to a displacement of the fixed position of the brush 8.

On the other hand, the electronic dial 1 of the present invention is
The tolerance for such displacement of the brush 8 is wide.
That is, as shown in FIG. 2, play occurs at the fixing portion with the pin 49, and the entire brush 4 including the support member 47 slightly shifts counterclockwise (the direction indicated by the arrow in FIG. 2) about the pin 48. Even when the dial body 2 rotates clockwise, signals are obtained in the order of the signal A and the signal B. When the dial body 2 rotates counterclockwise, the signals B and A are obtained. The signals are obtained in order. Therefore, the dial body 2
Whichever direction is rotated, the direction of rotation can be correctly detected.

As described above, in the electronic dial 1 of the present invention, the rotation direction and the rotation amount of the dial body 2 can be correctly detected even if the brush 4 is slightly displaced. Therefore, as described above, the structure of the mounting portion of the brush 4, the number of fixing points, and the like can be simplified, and the allowable range of the mounting accuracy (play, etc.) of the mounting portion can be widened. The interval (pitch) between the 46 can be further reduced. This contributes to the miniaturization of the electronic dial 1 itself and the device on which it is mounted.

Although the electronic dial according to the present invention has been described with reference to the illustrated embodiment, the present invention is not limited to this, and each part constituting the electronic dial may have any function that can exhibit the same function. It can be replaced with that of the configuration.

For example, the number and arrangement of the terminals constituting the brush, the shape of the code plate (particularly the number of contact portions), the arrangement and the like are as follows.
It is not limited to the illustrated one.

Further, the click mechanism is not limited to a ball click, and a click mechanism without a ball may be employed. The positioning means may be other than the click mechanism.

The electronic dial of the present invention is not limited to the one mounted on a camera, and may be any one mounted on a personal computer, a mobile phone, various optical devices, various audio devices, home appliances, and the like.

[0092]

As described above, according to the present invention, it is possible to provide an electronic dial having a simple structure and having few detection errors.

In particular, it is possible to simplify the structure of the mounting portion (fixed portion) of the brush, reduce the mounting accuracy, and reduce the interval between terminals constituting the brush, while enabling accurate detection. It can contribute to the miniaturization of the electronic dial and the equipment on which it is mounted.

[Brief description of the drawings]

FIG. 1 is a plan view showing an embodiment of an electronic dial according to the present invention.

FIG. 2 is a plan view showing a state in which a brush is displaced in the electronic dial shown in FIG. 1;

FIG. 3 is a plan view showing a shape of a code plate in the electronic dial shown in FIG.

FIG. 4 is a sectional side view of the electronic dial shown in FIG. 1;

FIG. 5 is a plan view showing an electronic dial of a comparative example.

FIG. 6 shows an electronic dial (comparative example) shown in FIG.
FIG. 4 is a plan view showing a state in which the brush is displaced.

FIG. 7 is a plan view showing a shape of a code plate in the electronic dial (comparative example) shown in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electronic dial 2 Dial main body 21 Rotating shaft 22 Unevenness 3 Code plate 31 Ring part 32 Contact part 4 Brush 41-46 Terminal 47 Support member 48, 49 Pin 5 Click mechanism 51 Click plate 52 Depression 53 Ball 54 Spring 6 Electronic dial (Comparison) Example) 7 code plate (comparative example) 71 ring part 72 contact part 72a inner peripheral part 72b outer peripheral part 8 brush (comparative example) 81 to 86 terminal 87 support member 88, 89 pin 100 base part 110 upper plate 120 lower plate 130 space 140 Shaft hole 150 hole

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H01H 19/56 H01H 19/56 Y

Claims (6)

[Claims] 1. A dial body rotatably supported by a base, and contact parts installed on the dial body and extending linearly from the center of the dial body toward the outer periphery are radially arranged at equal angular intervals. And a brush provided with a plurality of pin-shaped terminals whose tips can come into contact with the code plate, wherein one of the terminals and the other terminal have different lengths, An electronic dial, wherein when the dial body rotates in a predetermined direction, the terminals having different lengths contact the code plate with a time lag. 2. The electronic dial according to claim 1, having a function of detecting a rotation direction and a rotation amount of the dial main body. 3. The electronic dial according to claim 1, wherein the brush has at least one terminal that is always in contact with the code plate. 4. The electronic dial according to claim 1, wherein the brush is supported at one to three fixed points. 5. The electronic dial according to claim 1, further comprising positioning means for positioning a rotational position of the dial main body. 6. The electronic dial according to claim 5, wherein said positioning means is a click mechanism.