JPS6235217Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a switch, and an object of the present invention is to provide a small-sized switch suitable for various rotation detectors, digital code generation switches, etc.

Recently, this type of switch has been required to be miniaturized, and at the same time, it is also required to generate as many signals as possible within the movable range of the insulating substrate or the contacts that are in sliding contact with the insulating substrate.

For example, in a conventional rotation detection switch, as shown in FIGS. 1 and 2, a common contact pattern 31 and a plurality of contacts extending radially outward from the common contact pattern 31 are provided on one surface of a small-diameter disk-shaped insulating substrate 30. Patterns 32... are formed by printing or the like, and contacts 33 and 34 are provided that come into elastic contact with both contact patterns 31 and 32, respectively, and timing pulses are taken out from the contacts 34 as the insulating substrate 30 rotates. It's becoming like that. However, as mentioned above, there is a need to reduce the diameter of the insulating substrate 30 (for example, a diameter of 10 mm).
(back and forth), and when it is required to output a large number of timing pulses in one rotation of the insulating substrate 30, the intervals between the contact patterns 32 formed at equal intervals become extremely small, and the contacts 34 are connected to adjacent contact patterns. The risk of coming into contact with 32 and 32 at the same time increases. Therefore, highly accurate pattern formation is required to prevent connection between adjacent contact patterns 32, 32, and precise processing is also required to form the contact portion 34a of the contactor 34, resulting in poor manufacturing yields. Fine conductive powder generated by high-speed rotation 3
5 is rarely the contact pattern 3 as shown in the first diagram.
2, 32, the adjacent contact pattern 3
This also led to a situation where the terminals 2 and 32 were connected, causing an erroneous signal. Therefore, the number of contact patterns 32 formed on the insulating substrate 30 is naturally limited.

The present invention has been developed in view of the above points, and its details will be explained below with reference to one embodiment shown in FIGS. 3 to 7.

In the figure, 1 is a disc-shaped insulating substrate made of insulating synthetic resin such as acetal resin, with a diameter of 10 mm.
It is set to ~12mm. Reference numeral 12 denotes a metal disc made of a highly conductive thin metal plate, and its flat plate portion 3 is embedded in the insulating substrate 1.

Contact patterns protruding and formed by embossing are provided on the front and back of the metal disk 2 (see Figures 3 and 4), and on the front side, common contact patterns 4 are formed at equal intervals on the outer periphery. Contact patterns 5 are provided, and contact patterns 6 are also provided at equal intervals on the outer periphery of the back surface. The contact patterns 5 and 6 on the front and back sides are formed in the same number and in the same shape, and are alternately formed so as to compensate for the gaps between each other, and each gap between the contact patterns 5 and 6 is are also set equal.

The metal disk 2 is embedded in the substrate 1 so that the contact patterns 4, 5, and 6 on the front and back surfaces of the metal disk 2 are exposed on the same plane as the front and back surfaces of the insulating substrate 1 (see FIG. 6). The resin on the front and back of 2 is metal disk 2.
The center hole 7 and the small hole 8 (see FIG. 3) ensure that they are in close contact with each other. In this embodiment, the metal disk 2 is made of phosphor bronze plate or nickel silver plate with a thickness of 0.4 mm, the height of the contact pattern is set to 0.2 mm, and the minimum width of the contact pattern is set to 0.2 mm. The contact pattern is plated with precious metal if necessary.

Reference numerals 9, 10A, and 10B are elastic contacts formed from a thin metal plate with good conductivity such as a phosphor bronze plate, and the contact portions thereof are appropriately plated with precious metal. The child 9 is always in contact with the common contact pattern 4, and the contact 10A is in sliding contact with the contact pattern 5. In addition, the insulating substrate 1
The contactor 10B disposed on the back side of the insulating substrate 1 slides on the contact pattern 6, and the contactor 10A and the contactor 10B are electrically connected to each other, and as the insulating substrate 1 rotates, Pair of contacts 10A, 1
The output signal is taken out from the 0B output terminal.

That is, the insulating substrate 1 is fixed to the type spindle 11 of a micro-compact printer, for example as shown in FIG.
The rotational position of the type wheel shaft 11 rotated by the drive of the motor 12, in other words, the rotational position of the type wheel 13 that rotates integrally with the type wheel shaft 11 is detected.

In this case, the sum of the contact patterns 5... and 6... corresponds to the number of printed characters on the outer periphery of the printing wheel 13, and each time the printing wheel 13 rotates for one printed character, the contact pattern child 10A and contact pattern 5, or
The contactor 10B and the contact pattern 6 are alternately brought into conduction to derive an output signal (timing pulse).

In the above embodiment, a switch for generating timing pulses was explained as an example, but the present invention can also be applied to a so-called encoder switch as shown in FIG. 8. In the configuration shown in FIG. The pattern 21 and the dot-shaped contact patterns 22 . . . , 23 . They are mutually conductive and the common contact pattern 21
It is also connected. Therefore, each contactor 24A, 24B, 25 forming a pair on the front and back sides of the substrate 20
A, 25B, 26A, 26B, 27A, and 27B output terminals are selectively derived from the voltage supplied from the contactor 28 through the common contact pattern 21, and are determined by the combination of the signals at each output terminal. A predetermined binary code signal can be extracted. Although the above-mentioned two embodiments both take a rotary type switch as an example, it goes without saying that the present invention can also be applied to a so-called linear sliding type switch.

As described above, according to the present invention, since the contact patterns arranged alternately on the front and back sides of the insulating substrate are connected to and separated from the contact patterns that are electrically connected to each other, the contact patterns are arranged on each surface of the insulating substrate. The contact pattern spacing can be increased, increasing contact reliability. In addition, since the front and back sides of the board are used, there is no need to downsize the board even if a large number of contact patterns are formed as a whole, making it suitable for use in small rotation detection switches or digital code generation switches. It has a remarkable practical effect of being suitable.

[Brief explanation of the drawing]

1 and 2 are related to a conventional example, FIG. 1 is a plan view, FIG. 2 is a sectional view of a main part, FIGS. 3 to 7 are related to an embodiment of the present invention, and FIG. A plan view of the metal disk, FIG. 4 is a developed view taken along line A-A' in FIG. 3, and FIG. 5 is a plan view showing an insulating substrate and a contact.
Figure 6 is a developed cross-sectional view along line B-B' in Figure 5;
FIG. 7 is an explanatory diagram showing the state of use, and FIG. 8 is an explanatory diagram showing another embodiment of the present invention. DESCRIPTION OF SYMBOLS 1...Insulating substrate, 2...Metal disk, 4...Common contact pattern, 5...Contact pattern, 6...Contact pattern, 9, 10A, 10B...Contactor.

Claims (1)

[Scope of utility model registration request] An insulating substrate, a plurality of contact patterns that are electrically connected to each other inside the insulating substrate and provided on the insulating substrate, and a contact that is in sliding contact with the contact pattern and repeats contact and separation with the contact pattern. In a switch that generates a predetermined signal by the contactors sliding on the contact pattern, a pair of contacts electrically connected to each other is provided on the front and back sides of the insulating substrate, and the pair of contactors are electrically connected to each other. A contact pattern is formed on the back surface of the insulating substrate such that one of the contacts is located between each contact pattern on the front side of the insulating substrate to which one of the contacts slides, and the contact pattern on the back surface is connected to the paired contact pattern. A switch characterized in that the other of the contacts is configured to make sliding contact.