JPH0155732B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The invention of this application relates to a DIP rotary code switch.

First, a conventionally used switch of this kind will be explained with reference to the accompanying drawings. Figures 1 to 3
The figure shows the external shape of a conventional switch of this kind, in which a rotor b is rotatably disposed within a housing a on a base d via a disk (not shown). One common terminal c (referred to as a common terminal) and four terminals e are provided protruding from the base.

The purpose of this type of rotary code switch is to
For example, a 4-bit digital signal is extracted by rotating the rotor b together with the disk and setting it at a predetermined position. Therefore, as shown in Fig. 4, the switches S ₁ , S ₂ , S ₃ , and S ₄ are turned on and off as appropriate for each position of the rotor b, and output 16 types of codes. It is structured so that you can get it.

However, this type of rotary code switch has some drawbacks, such as a complicated wiring structure and troublesome manufacturing process. FIG. 5 is presented as an example to show these wiring configurations. illustrated
In IC logic circuits, each signal line is connected to the power supply line (Vcc) through a resistor (R) in order to sufficiently guarantee the threshold level. This method is called a pull-up, and this resistance is called a pull-up resistor. Depending on the logic, it is also possible to connect the common terminal c of the switch to the power supply line (Vcc) and drop the resistor to ground (G). This method is called pulldown. Regardless of whether the above-mentioned pull-up method or pull-down method is adopted, a plurality of resistors are required for one switch. Therefore, the design of the printed pattern is naturally complicated and troublesome.

Next, FIG. 6 will be presented as a second similar usage example. In this usage example, a plurality of rotary code switches are lined up and used as digits of 1, 10, 100, etc. for address setting, etc. In order to read the address number, the terminals of the switches are connected to the common line from the decoder f, and the common terminal c of each switch is grounded down in sequence. For this purpose, four diodes are required for each switch in addition to the pull-up resistor described in the first usage example. For example, the 1st place switch g represents 2, and the 10th place switch h represents 6.
Even in the case where the 1st position is displayed, if the common terminal c of the 1st position switch g is grounded to read the 1st position, only 2 of the signal lines 1, 2, 4, and 8 should go to L level. However, among switches 2 and 4 of the 10th switch h, they are connected via the common terminal c of the 10th switch h, so if there is no diode, the signal line of 4 will also be at L level. , and the first digit will be treated as 6. Therefore, if a code switch with the above configuration is to be used for setting a telephone number in a facsimile machine, etc., normally as many as 10 code switches of this type are required, and around these switches, 40 resistors and the same number of diodes are required. must be used. Therefore, the design of the printed circuit board used is not only extremely complicated and difficult, but also has drawbacks such as an increase in the area of the printed circuit board and an increase in assembly cost.

The purpose of the present invention is to overcome the various deficiencies of the conventional example, and its gist is to provide a separate pull-up terminal to a DIP/rotary cord switch that has one common terminal and multiple output terminals. In addition, the same number of resistors as the number of output terminals are wired between the pull-up terminal and the output terminal group.

Embodiments of the present invention will now be described with reference to the accompanying drawings of the specification.

7 to 9, a rotor 12 is housed in a housing 10 via a disk (not shown) so as to be rotatable on the upper surface of the base. A common terminal 16, a pull-up terminal 18, and a plurality of terminals 20 are mounted on the base 14. Reference numeral 22 denotes a rotation slit carved into the upper surface of the rotor 12, as will be described later. In FIG. 10, the housing 10
There is a click spring part 24 on the outside, and a hole 28 on the bottom that can fit into the center protrusion 26 of the base 14.
A rotor 12 having a rotor 12 is housed therein. Reference numeral 15 denotes an O-ring inserted between the housing 10 and the rotor 12 to seal the two members.

The base 14 fitted into the housing 10 includes
A ceramic substrate 30 is embedded, and conductors 46a, 46b, 46c, 46d, 4, which will be described later, are formed on the upper surface of the ceramic substrate 30.
6e, and on its lower surface, a plurality of resistors 50 and a group of conductors are arranged, as will be described later. Also, contact portions 36a, 3 are provided in a plurality of square groove holes 34 drilled in the base 14 so as to reach the upper surface of the ceramic substrate 30.
6b, 36c, 36d, and 36e are accommodated. A protrusion (not shown) provided on the lower surface of the rotor 12
are fitted into opposing holes (not shown) drilled in the upper surface of the disk 38. Therefore, the center portion of the disk 38 is fitted into the base protrusion 26 and is freely rotatable on the upper surface of the base as the rotor 12 rotates.

The lower surface of the disk forms a printed board with a suitable pattern (not shown), and as the rotor rotates, a predetermined portion of the pattern energizes a switch depending on the state of contact with the contact portion 36. The structure is configured to provide a non-current carrying effect.

The configuration of the base 14 will be explained in more detail. 1st
In Figure 1, terminal groups 16, 18, and 20 are punched out from a single plate-shaped body, and a base 14 is inserted using synthetic resin or the like while each terminal is connected by an edge piece 40 of the plate-shaped body. This shows the top view of the molded product.
The edge piece 40 is cut off along the lines X-X and Y-Y to form a desired group of terminals, and each of the edge pieces 40 is bent in a predetermined direction at a step 42 provided at the end of the rear base 14.

The common terminal 16, the pull-up terminal 18, and the terminal group 20 are respectively attached to both sides of the ceramic substrate 30. One way to do this is to connect the ceramic substrate 30 with a forked portion 44 provided at the end of the terminal. You can also hold both sides.

FIG. 13 is a top view of the ceramic substrate 30, in which five square conductors 46a, 46b, 46c, 46d,
46e, these conductors may be formed by printing a conductive paste and then firing it. Said square conductor 46
a, 46b, 46c, 46d, and 46e are contact portions 36a, 36b, 36c, 36d, and 36e, respectively.
come into contact with.

A through hole 48 is electrically connected to a conductive member on the lower surface of the ceramic substrate using a conductive paste or the like.

FIG. 14 shows the bottom surface of the ceramic substrate, and the conductors are arranged in four groups 47a, 47b, 4
Classified into 7c and 47d. Further, reference numeral 50 consists of four resistor groups. These resistor groups 50 each connect the conductor 47c and the conductor 47b. These conductor groups and resistor groups are each made by printing and firing a paste. These members are also connected to their respective terminals by soldering, as shown.

After assembling the conductor and other related parts to the ceramic substrate 30 as described above, it is insert molded with synthetic resin or the like, and the rear edge 40 is shaped like X-X,
The DIP/rotary/
The code switch is completed. The circuit of this switch is shown in FIG. That is, 1
A pull-up terminal 18 is provided separately from a common terminal 16 and a plurality of output terminals 20, and the same number of resistors as the number of output terminals are arranged between the pull-up terminal 18 and the plurality of output terminals 20. By inserting a driver into the slit 22 of the rotor 12 and rotating it in a predetermined direction at a predetermined angle, the spring portion 24 generates a clicking sound on the inside of the rotor, slides on the upper surface of the base 14 together with the disk 38, and the pattern of the disk is changed. The switch is operated by contacting or not contacting the appropriate contact portions 36a...36e, energizing or de-energizing them.

The structure and circuit of the switch according to the present invention are extremely simple, do not require complicated design, require a small board area, and can be used in various small electric devices.

[Brief explanation of drawings]

The attached FIGS. 1 to 6 illustrate conventional DIP rotary code switches. Figure 1 is a plan view of a conventional DIP/rotary code switch. FIG. 2 is a side view of FIG. 1. FIG. 3 is a bottom view of FIG. 1. Figures 4, 5, and 6 are circuit diagrams of conventional DIP/rotary code switches. 7 through 15 illustrate one embodiment of a DIP rotary code switch according to the present invention. FIG. 7 is a plan view of the DIP/rotary code switch according to the present invention.
FIG. 8 is a side view of FIG. 7. FIG. 9 is a bottom view of FIG. 1. FIG. 10 is a sectional view taken along line A-A in FIG. 7.
FIG. 11 is a plan view of a ceramic substrate without cutting the edges of the insert-molded ceramic substrate. Figure 12 is B
-A cross-sectional view taken along the line B. FIG. 13 is a plan view showing the surface of the ceramic substrate before insert molding is performed on the base. FIG. 14 is a bottom view of FIG. 13.
FIG. 15 is a circuit diagram of a switch according to the present invention. 16... Common terminal, 18... Pull-up terminal, 20... Terminal group, 30... Ceramic board,
36a, 36b, 36c, 36d, 36e... Contact portion, 38... Disc, 46a, 46b, 46
c, 46d, 46e...Conductor (upper surface of ceramic substrate), 47a, 47b, 47c, 47d...Conductor (back surface of ceramic substrate), 50...Resistor.

Claims (1)

[Claims] 1. Equipped with one common terminal and a plurality of output terminals
In a DIP rotary cord switch, a separate pull-up terminal is provided, and the same number of resistors as the number of output terminals are wired between the pull-up terminal and the output terminal group. Switch. 2. The DIP rotary cord switch according to claim 1, which is formed by sandwiching a ceramic substrate provided with terminals, conductors, resistors, etc. into a base.