JPS6055934B2 - digital switch - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a digital switch for circuit setting used in various electronic devices, and particularly to a digital switch in which a diode is built into the case of the digital switch.

Generally, in various electronic devices such as automatic control devices and measuring devices, digital switches are used as setting devices for counters, digital timers, and the like.

This type of digital switch is made by, for example, rotatably supporting a rotor having a slider that faces and contacts a printed circuit board fixed in a case, and rotating this rotor in parts. A rotary type digital switch is known in which a contact mechanism comprising the printed circuit board and a slider is used to establish continuity between a common terminal and appropriate terminals to obtain a desired output signal.

On the other hand, in various electronic devices, when introducing the output signal of the digital switch to the CPU, the number of LSI terminals is limited, so as shown in FIG. The output signals of ... are often introduced via a common bus line.

In such a case, especially when inputting a coded signal, it is necessary to insert a diode between each output terminal of the digital switch and the bus line, otherwise the read signal will not be applied to the specified digital switch. In this case, there is a possibility that the output terminals of other switches may be short-circuited and a desired output signal may not be obtained. For example, in FIG. 1, if no diode is present, switch 5 set to (1010)
When a read signal is applied to the common terminal of switch 1, if the other switches 52 are set to (0110), the output terminal b2 of switch 52 and switch 3 are short-circuited through the common terminal, and the output terminal becomes (1110). ) will be introduced, and the desired signal (1010) will not be obtained. As described above, in various electronic devices, when using a digital switch, it is often necessary to connect a diode.

However, conventional digital switches do not have a built-in diode, so the terminal part is formed long in advance so that a diode can be connected later, and a diode can be connected to the terminal as necessary. I was getting used to it. Therefore, conventional digital switches have disadvantages such as the troublesome connection of diodes and the need for extra space due to the long terminals. This invention has been made in view of the above problems, and includes a rotor that holds a printed circuit board with a predetermined pattern and is rotatably supported in a case, and is opposed to and in contact with the printed circuit board, and is connected to a terminal. A plurality of connected sliders are fixed to a case, and the rotor is dividedly rotated by operating an operating member protruding outside the case, whereby a contact mechanism consisting of the sliders and a printed circuit board In a rotary digital switch configured to obtain a desired output signal from the terminal, a diode chip is die-bonded to either the slider or the terminal, and the diode chip and the slider or the terminal are bonded together. By connecting these and then molding them in resin and fixing the molded block to the case, it is possible to provide a digital switch with a built-in diode at a low cost,
The purpose of the present invention is to provide a digital switch that can be configured in a small size and has extremely high space efficiency. An embodiment of the present invention will be described below based on the drawings.

In Figures 2 and 3, 1 is a synthetic resin. 2 is a disc-shaped rotor rotatably supported on a support shaft 3 protruding within the case body 1;
On the outer peripheral surface of the rotor 2, consecutive numbers corresponding to the desired number of divisions are printed at equal pitches, and these numbers correspond to the number of divided rotations of the rotor 2. Accordingly, each pitch is displayed in the display window 4 formed in the upper surface of the case body 1.

Further, a printed circuit board 5 having a predetermined pattern is fixed to the front surface of the rotor 2, and a ratchet wheel 6 is integrally formed on the back surface thereof. Reference numerals 7 and 7 designate operating members that are arranged symmetrically within the case body 1 with the ratchet wheel 6 in between, and are held by the case body 1 so as to be slidable in the vertical direction. A push button portion 7a protrudes from the support hole 1a provided on the top surface of the case to the outside of the case.
, and its lower inner side abuts against a protrusion 8 protruding inside the case body 1 to regulate its position.

Further, a feed pawl 9 is formed inside the upper end of the operating member 7 and projects obliquely downward, and the tip of the feed pawl 9 is connected to a guide portion 10 formed on the inner wall surface of the case body 1. It is designed to be guided by coming into contact with the side of the That is, when the push button portion 7a is pressed, the tip of the feed pawl 9 descends along the guide portion 10, contacts a part of the pawl 6a of the ratchet wheel 6, and moves the ratchet wheel 6 by one pitch. It is designed to be rotated in parts. Furthermore, a stopper 11 is protruded from the inside of the lower end of the operating member 7, and when not in operation, this stopper 11 engages between the pawls of the ratchet wheel 6 to prevent the ratchet wheel 6 from rotating. , and while positioning the rotor 2 at a predetermined split stop position, one operating member 7
When pressed, the stopper 11 of the other operating member stops the divided rotation of the ratchet wheel 6 by 1 by the biasing force of the return spring 12 disposed between the operating members 7, 7 and the lower wall of the case body 1. It has become more permissible on a pitch-by-pitch basis. That is, when one operating member 7 is pressed, its feed claw 9 engages between the claws of the ratchet wheel 6 to rotate the ratchet wheel 6, and as a result, the other operating member 7
When the stopper is pushed back by the pawl 6a of the ratchet wheel 6 and the stopper 11 engages between the next pawl, the spring force of the return spring 12 presses the stopper 11 again between the pawls and the next divided rotation is started. The ratchet wheel 6 and rotor 2 are positioned at this position. The return spring 12 is a plate spring formed in a dogleg shape, and is attached to the support block 1 provided on the lower wall of the case body 1.
3, and its both ends abut against the lower ends of the operating members 7, 7, pressing them diagonally upward and inward. Next, a transparent dustproof cover 15 attached to the front of the case body 1 so as to cover the front of the rotor 2 is held by a holding block 16 fixed to the case body 1, and the tip end of the cover 14 is fixed to the case body 1. This is a slider that comes into contact with the printed circuit board 5 at a window 14a provided in the center. The sliders 15 are arranged in such a way that conduction is established between the sliders determined in accordance with the respective divided rotational positions of the rotor 2 by a predetermined pattern on the printed circuit board 5, and the sliders 15 are electrically connected to each other in accordance with a predetermined pattern on the printed circuit board 5. An output signal corresponding to the number or symbol displayed on the display window 4 of 1 is transmitted to the terminals 18, 18, . . . connected to the slider 15 via the diode 17.
It can be obtained from... Note that 19 is a cover for fixing the dustproof cover 14 and the holding block 16 to the case body 1, and a seal 20 is interposed between this cover 19 and the dustproof cover 14 so as to surround the window 14a. equipped. Next, the structure of the holding block 16 that holds the slider 15 and the terminal 18 will be explained in detail. On one side of this holding block 16, there are a plurality of supporting pieces 21, 21, . . . , and on the other side. terminal 18,1
8, . The diode 17 is connected between the terminal 18 and the inner end thereof.

This holding block 16 is constructed by first die-bonding the diode chips 17 to the inner ends of each of the support pieces 21, then connecting the diode chips 17 and the inner ends of the corresponding terminals 18, and then It is manufactured by using these as inserts and molding the entire body with resin. Note that the holding block 16 may be insert-molded by die-bonding the diode chip 17 directly to the rear end of the slider 15 without using the support piece 21, or may be insert-molded by directly die-bonding the diode chip 17 to the rear end of the slider 15. It is also possible to bond a diode chip to the side of the support piece 21, connect it to the support piece 21, and then mold it. FIG. 5 shows another example of the structure of the holding block 16, in which a diode chip 1 comprising a plurality of diodes is arranged at the inner end of the terminal 18a.
7a is die-bonded, each diode in the diode chip is connected to the corresponding terminal 18 and support piece 21, and then resin molded.

Note that 18c is a common terminal. In addition, in such a configuration, in order to isolate each diode in the diode chip 17a, the terminal 1 on which the chip is mounted
It is necessary to apply a (-) voltage to 8a. As described above, the digital switch according to the present invention has a rotor that holds a printed circuit board with a predetermined pattern rotatably supported in a case, faces and abuts the printed circuit board, and is connected to a terminal. A plurality of sliders are fixed to a case, and the rotor is dividedly rotated by operating an operating member protruding from the case, whereby a desired output signal is generated by a contact mechanism consisting of the sliders and a printed circuit board. In a rotary digital switch configured to obtain from the terminal, a diode chip is die-bonded to either the slider or the terminal, and after the diode chip and the slider or the terminal are connected, A block formed by resin molding these parts is fixed to the case so that the contact part of the slider comes into contact with the printed circuit board, so it is possible to provide a digital switch with built-in diodes at low cost. Since there is no need to form a long terminal in advance so that a diode can be connected later, the entire switch can be made smaller than the conventional switch, and space efficiency can be improved.

Furthermore, since the digital switch of the present invention has a structure in which the printed circuit board is attached to the rotor and the slider is attached to the case, the pattern of the printed circuit board can be simplified and the board can be made smaller. Together, this makes it possible to construct an extremely compact digital switch.

[Brief explanation of the drawing]

Figure 1 is a circuit explanatory diagram showing an example of the use of a digital switch.
FIG. 2 is a sectional front view showing an example of the digital switch according to the present invention, FIG. 3 is a sectional side view thereof, FIG. 4 is an exploded perspective view thereof, and FIG. 5 is a sectional view showing another example of the structure of the holding block. It is an explanatory diagram. 1...Case body, 2...Rotor, 5
...Printed circuit board, 7...Operation member,
15...Slider, 16...Holding block, 17...Diode chip, 18...
...Terminal.

Claims (1)

[Claims] 1 A rotor that holds a printed circuit board with a predetermined pattern is rotatably supported in a case, and a plurality of sliders that face and abut the printed circuit board and are connected to terminals are fixed to the case. A rotary rotor configured to obtain a desired output signal from the terminal through a contact mechanism comprising the slider and a printed circuit board by rotating the rotor in parts by operating an operating member protruding from the case. In this type of digital switch, a diode chip is die-bonded to either the slider or the terminal, the diode chip and the slider or terminal are connected, and then these are resin molded to form a molded block. , a digital switch in which the contact portion of the slider is fixed to the case so as to come into contact with the printed circuit board;