JPS6331308Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a device with a built-in digital switch that outputs a binary code.

A digital switch usually consists of a digital pattern section with pattern wiring, a plurality of contact springs that come into sliding contact with the digital pattern section, a handle, and a stopper spring that determines the stop position of the handle, and is used to rotate the handle. Therefore, a binary code is obtained by changing the contact position of the contact spring with respect to the digital pattern part.When this digital switch is built into a device, it is necessary to incorporate the digital switch in a finished product state from the viewpoint of accuracy. This resulted in high costs as a component and was problematic in that it placed constraints on the design of the equipment.

The present invention was developed in view of these points, and it solves the above drawbacks and improves accuracy by forming a digital pattern on the printed circuit board of the device and also attaching the handle and stopper spring to the printed circuit board. The purpose of the present invention is to provide a device with a built-in digital switch that provides a stable operating feel.

The present invention will be explained in detail below based on illustrated embodiments. The illustrated device functions as a transmitter in a power line carrier control system, and a digital switch is used to select the channel corresponding to the receiving relay unit to be operated. Case 1 consisting of body 12 and cover 11
This device, which has a printed circuit board 2 inside and is connected to a power line by a cord 15, has a display section 13, a digital switch A, and a plurality of push buttons 14 on the top of the case 1. A channel selection and a subchannel selection are made using the push button 14, and the channel thus selected and set is displayed on the display section 13.

Digital switch A includes a handle 4 whose top surface is exposed to the outside through a round hole 16 provided in a cover 11;
A contact spring 6 provided on the back surface of the handle 4, a digital pattern section 3 formed on the printed circuit board 2 together with other control circuit sections, and a stopper spring that comes into elastic contact with a locking protrusion 8 provided on the circumferential surface of the handle 4. 5
The handle 4 has a shaft 9 protruding from its back surface inserted into a shaft hole provided at the center of the digital pattern section 3 of the printed circuit board 2, and a peripheral portion of the upper surface inserted into the hole 16 of the round hole 16 of the cover 11. The contact spring 6 is held by the edge and is rotatable, and the contact spring 6 comes into elastic contact with the digital pattern section 3 due to the pressing force received from the cover 11. The stopper spring 5 provides a click stop to the rotation of the handle 4, and is formed in a bifurcated shape. A protrusion 17 provided at the base of the stopper spring 5 is inserted into a square hole drilled in the printed circuit board 2, and the tip of the protrusion 17 is inserted. As shown in FIG. 5b, it is fixed to the printed circuit board 2 by heat welding on the back surface of the printed circuit board 2, and one side piece elastically contacts the locking protrusion 8 on the periphery of the handle 4 and clicks when the handle 4 is rotated. This gives a stop. At this time, simply fixing the base to the printed circuit board 2 will easily cause looseness in the stopper spring 5, so
In the present invention, as shown in FIG.
A positioning protrusion 7 is integrally formed on the inner surface of the handle 4 adjacent to the round hole 16, and when the cover 11 is assembled, the positioning protrusion 7 comes into contact with the other side of the stopper spring 5, causing the stopper spring 5 to be pushed across the handle 4. It is designed to be pressed. Therefore, even if there is play between the stopper spring 5 and the printed circuit board 2, one side of the stopper spring 5 elastically contacts the handle 4 without causing any displacement, and the click stop is applied to the rotation of the handle 4. At the same time, the rotation operation torque of the handle 4 is kept constant, and the stop position of the handle 4 is determined so that the contact spring 6 contacts the digital pattern section 3 at the correct position. The positioning protrusion 7 may be provided as a pin-shaped protrusion on the printed circuit board 2, as shown in FIG. 7, instead of on the inner surface of the cover 11. The same effect can be obtained in this case as well. In addition, 18 in the figure is a display element transmission window in the display section 13;
9 is the push button insertion hole, 3a is ²⁰ pattern, 3b is ²¹
The patterns 3c are 2 ² patterns, 3d are 2 ³ patterns, and 3e are common patterns. Also cover 1
As is clear from FIG. 6b, the positioning protrusion 7 provided on the printed circuit board 1 also functions as a positioning surface for the printed circuit board 2.

As described above, in the present invention, the digital pattern is formed on the printed circuit board inside the device, and the handle and stopper spring are also attached to the printed circuit board, so it can be incorporated at low cost and there are no design restrictions. However, even if the stopper spring is installed in this way, the position of the stopper spring is regulated so that the positioning protrusion maintains proper elastic contact between the handle and the stopper spring even if there is a looseness in the attachment of the stopper spring to the printed circuit board. Furthermore, the click stop and operating torque applied to the handle by the stopper spring are stable, making it possible to construct a highly accurate digital switch.

[Brief explanation of the drawing]

Figure 1 is a perspective view of the first embodiment of this study, Figure 2 is a perspective view of the cover and printed circuit board, Figure 3 is a front view of the digital pattern section, and Figures 4a and b are handles. FIGS. 5a and 5b are front views and partial side views of the same printed circuit board, FIGS. 6a and 6b are rear views and partial sectional views of the same cover, and FIGS. Figures a and b are a partial front view and a partial bottom view of a printed circuit board of another embodiment, in which 1 is a case, 2 is a printed circuit board, 3 is a digital pattern section, 4 is a handle, 5 is a stopper spring, and 6 is a partial bottom view. Contact spring 7 indicates a positioning projection.

Claims (1)

[Scope of utility model registration request] A digital pattern section is formed on a printed circuit board disposed inside the case, and a handle equipped with a contact spring that slides against the digital pattern section on the back side is rotatably attached to the printed circuit board, and a positioning protrusion is attached to the inner surface of the case or the printed circuit board. A built-in digital switch is provided in which both sides of a two-pronged stopper spring, one end of which is fixed to a printed circuit board, are placed between the handle and the positioning protrusion, and each side piece is brought into elastic contact with the handle and the positioning protrusion. device.