JPH04342914A - Rotational position detecting device for dial plate - Google Patents

Abstract

PURPOSE:To provide a rotational position detecting device for a dial turnable plate in which the occupied area of a circuit pattern on a pattern substrate is extremely small. CONSTITUTION:A dial plate 1, on which numeral characters or the like are displayed, and a stationary plate 53 are mutually faced to each other, and predetermined signals are generated in response to the rotational, position of the dial plate relative to the stationary plate. A plurality of movable contacts 3 and fixed contacts 4 corresponding to the movable contacts are mounted on the stationary plate, at different locations in the radial direction, and working protruded parts 2, which selectively bring the respective movable contacts into contact with the respective fixed contacts, are mounted on the dial plate.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotational position detection device for detecting the rotational position of a dial plate.

0002

2. Description of the Related Art A conventional dial plate rotational position detecting device will be explained with reference to FIGS. 4(A), (B), and (C). Figure 4
(A) shows the front view of the dial plate, and FIG. 4(B) shows the front view of the dial plate.
A side view of the rotational position detection device of the dial plate is shown in FIG.
C) shows the circuit pattern on the pattern board facing the dial board.

As shown in FIG. 4(A), a dial plate 51
On the top surface, 360° is divided into 16 equal parts and "0 to 9, A to F
” numbers and letters are printed on it. As shown in FIG. 4(B), when the side of the thick dial plate 51 is grasped and each number/letter is rotated to the reference point P, the rotation stop mechanism ( (not shown)
This allows the rotation to stop when the rotation reaches the center of each number/letter. A contact spring 52 is fixed to the lower surface of the dial plate 51, and the contact spring 52 slides on a circuit pattern 54 formed on a circuit board 53 in conjunction with the rotation of the dial plate 51. . As shown in FIG. 4(C), the tip of the contact spring 52 is
The contact spring 52a is separated into sections 5a to 5e of the book, and is always in contact with the innermost pattern 55 of the circuit pattern 54 formed in a concentric circle. The patterns other than the innermost pattern 55 are composed of a contact pattern 56 that performs a contact function and a connection pattern 57 that does not perform a contact function, and the contact spring 52 is arranged so that it makes sliding contact only at the contact pattern 56. It has become. With this configuration, a predetermined signal can be generated depending on which contact pattern the sections 52b to 52e are in contact with.

When the structure of the contact switch and circuit pattern is replaced with an electronic circuit, it becomes as shown in FIG. 5. The electronic circuit shown in FIG. 5 includes four switches SW1 to SW4.
Depending on the combination of turning on or off, 16 output states can be detected, and the 16 combinations can discriminate between numbers and letters 0 to 9 and A to F.

[0005]

However, in the conventional dial plate rotational position detecting device, as shown in FIG.
The area occupied by the circuit pattern 54 becomes very large, and this becomes a constraint for providing circuit patterns other than the circuit pattern 54 on the pattern board 53.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a rotational position detection device for a dial plate in which the area occupied by the circuit pattern on the pattern board 53 is extremely small. .

[0007]

[Means for Solving the Problems] In order to solve the above problems, the present invention arranges a dial plate displaying numbers, characters, etc. and a fixed plate to face each other, and corresponds to the rotational position of the dial plate with respect to the fixed plate. In the rotational position detection device for a dial plate, the fixed plate is provided with a plurality of movable contacts at different positions in the radial direction and fixed contacts corresponding to the movable contacts, An operating protrusion is provided for selectively bringing the movable contact into contact with the fixed contact.

[0008] Furthermore, the rotational position of the dial plate is such that a dial plate displaying numbers, letters, etc. and a fixed plate are arranged facing each other, and a predetermined signal is generated in accordance with the rotational position of the dial plate with respect to the fixed plate. In the detection device, a plurality of optical sensors are provided on the fixed plate at different positions in the radial direction,
The dial plate is provided with an operating protrusion that selectively blocks light from the optical sensor.

[0009]

According to the present invention, a predetermined number of operating protrusions corresponding to the number "5", for example, are formed on the back surface of the dial plate. When the number "5" on the surface of the dial plate is rotated to the reference point position, a predetermined number of operating protrusions corresponding to this "5" push down the movable contact provided on the fixed plate, and the movable contact and fixed The contacts are turned on. This “5
” is set as the reference point, a signal corresponding to “5” is generated. The same applies to other numbers and characters other than this "5".

Further, when a plurality of optical sensors are provided in the radial direction of the fixed plate, the optical sensors are turned on and off in correspondence with a predetermined number of actuating protrusions corresponding to, for example, "5". A signal corresponding to "5" is generated in accordance with this on/off state.

[0011]

Embodiments Hereinafter, embodiments embodying the present invention will be described with reference to the drawings. In addition, the same reference numerals are given to the parts already explained in FIG. 4, and duplicate description will be omitted. Figure 1 (A
) shows a side view of an embodiment of the present invention, and FIG.
A perspective view of the back side of the dial plate of the example is shown, and FIG. 1(C) is a back view of the dial plate.

As shown in FIGS. 1A, 1B, and 1C, the dial plate 1 and the pattern board 53, which is a fixed plate, are arranged parallel to each other, and the center of the dial board 1 is located at the pattern board 53. It is attached to by a rotation support member (not shown). On the lower surface of the dial plate 1, a plurality of protruding walls 2a, 2b, which are operating protrusions, are formed so as to form part of a concentric circle from the center of the dial plate 1.

One end of the contact spring 3, which is a movable contact with an inverted V-shaped side surface, is soldered to the upper surface of the pattern board 53, and the other end is disposed opposite to the fixed contact 4. Figure 2 (
As shown in A), the tip of the contact spring 3 has four sections 3a.
~3d, and each tip corresponds to four divided fixed contacts 4a~4d. Each of the vertices 3A to 3D of the inverted V shape of the contact spring 3 comes into contact with the lower end surface of each projecting wall 2, and becomes a point of action that presses down each section 3a to 3d of the contact spring 3.

Next, the operation will be explained with reference to FIG. 2(B). In addition, in FIG. 2(B), it is assumed that when the dial plate 1 is rotated, the protruding wall 2 moves in the directions of arrows A and B. Assume that the dial plate 1 is now stopped at a designated position of a certain character (for example, "8 (1000)"). In this case, since the lower end surface of the projecting wall 2a is pressing down on the apex 3A of the section 3a, the contact 5a is pressed down and comes into contact with the fixed contact 4a. On the other hand, the apex 3B of the contact spring does not contact the protrusion wall 2b, and therefore does not contact the corresponding fixed contact 4b on the pattern board 53.

Next, 1 from the "certain character specified position"
When the protrusion wall 2a is rotated by the character, it comes off the apex 3A, so it is released from the above-mentioned state of being pressed by the protrusion wall 2a, and the contact point 5a jumps up due to its spring properties, shifting to a non-contact state. Regarding the sections 3c and 3d other than the sections 3a and 3b, the same on/off operation as described above is performed corresponding to each of the protruding walls 2c and 2d. Therefore, the four contacts 5a to 5
d and the on/off combinations of the fixed contacts 4a to 4d, it is possible to generate 16 kinds of predetermined signals.

In this embodiment, a fixed contact and a contact spring are used as the signal generating section, but an optical sensor (for example, a photointerrupter) may also be used. That is, as shown in FIG. 3, a photointerrupter 11 is disposed on a pattern substrate 53 at a position corresponding to a protruding wall 2 of a dial plate (not shown), and a photointerrupter 11 is disposed between a light emitting section 12 and a light receiving section 13. The rotated protrusion wall 2 is inserted. In this way, an on/off signal can be generated depending on the presence or absence of the protruding wall 2 between the light emitting section 12 and the light receiving section 13.

[0017]

Effects of the Invention As explained above, according to the present invention, operating protrusions (protruding walls) corresponding to numbers and letters are provided on the back surface of the dial plate, and movable contacts and fixed contacts are provided on the fixed plate (pattern board). Since a predetermined signal is generated by selectively bringing the operating protrusion into contact with the movable contact, the area occupied by the pattern on the fixed plate can be reduced.

Alternatively, a plurality of optical sensors may be provided in the radial direction of the fixed plate to perform on/off control. The area occupied by the pattern on the fixed plate can be reduced.

[Brief explanation of drawings]

FIG. 1: (A) is a side view of an embodiment of the present invention, (B) is a perspective view of the back side of the dial plate of the embodiment, (C) is
It is a back view of the said dial board.

FIG. 2(A) is a perspective view of a contact spring, and FIG. 2(B) is a diagram showing a contact state between the contact spring and a protruding wall of a dial plate.

FIG. 3 is a perspective view of another embodiment.

[Fig. 4] (A) is a plan view of a conventional dial plate, (B)
is a side view of a conventional dial plate rotational position detection device, (
C) is a plan view of a conventional patterned substrate.

FIG. 5 is an equivalent circuit diagram of a conventional dial plate rotational position detection device.

[Explanation of symbols]

1...Dial plate 2...Protrusion wall (operating protrusion) 3...Contact spring (movable contact) 4...Fixed contact 5...Contact 11...Photointerrupter (optical sensor) 53...Pattern board (fixed plate)

Claims (2)

[Claims] 1. A dial plate displaying numbers, letters, etc. and a fixed plate are disposed facing each other, and a rotational position of the dial plate is arranged such that a predetermined signal is generated in accordance with the rotational position of the dial plate with respect to the fixed plate. In the detection device, the fixed plate is provided with a plurality of movable contacts and fixed contacts corresponding to the movable contacts at different positions in the radial direction, and the dial plate is provided with:
A rotational position detecting device for a dial plate, characterized in that an operating protrusion is provided for selectively bringing the movable contact into contact with the fixed contact. 2. A dial plate displaying numbers, letters, etc. and a fixed plate are disposed facing each other, and a rotational position of the dial plate is arranged such that a predetermined signal is generated in accordance with the rotational position of the dial plate with respect to the fixed plate. In the detection device, the fixed plate is provided with a plurality of optical sensors at different positions in the radial direction, and the dial plate is provided with an operating protrusion that selectively blocks light from the optical sensors. Rotary position detection device.