JPH0125329Y2 - - Google Patents

Description

[Detailed description of the invention] This invention applies to the switch of an oscilloscope probe, and the switch mechanism is put together so that it can be incorporated into the probe. In order to expose the elastic antenna and the handle of the main body, this is done by engaging with a plurality of steps provided on the wall of the groove bored in the longitudinal direction of this cylinder, making the switching operation easy. The circuit is connected to long and short electrode plates arranged oppositely in the cylindrical body, and the U-shaped electrode spring protruding to the side of the main body is always in contact with the long electrode plates, and is brought into contact with and separated from the short electrode plates. It is designed to essentially form an alternative circuit.
A specific example thereof will be described in detail with reference to the drawings as follows.

Reference numeral 1 denotes a cylindrical body made of an insulating material, and is made of, for example, synthetic resin. The cylindrical body 1 has stoppers 2 and 3 made of an insulating material, for example, a synthetic resin molded product, at both ends, and a groove 4 extending in the longitudinal direction on the peripheral wall. A plurality of step portions 6 are provided on the wall surface 5 of this groove 4 in the longitudinal direction of the groove 4.
The chamber 7 of this cylindrical body 1 has a high impedance
Circuit 8 with parallel arrangement of R _H and low impedance R _L
A short electrode plate 10 to be connected to the low impedance side circuit 9 and a long electrode plate 12 to be connected to the high impedance side circuit 11 are provided. The other end of the electrode plate 12 is then curved so as to be connected to the conductive wire 13. Reference numeral 14 denotes a main body made of an insulating material, which is formed by molding, for example, synthetic resin. The outer cross-sectional shape of the main body 14 substantially matches the inner cross-sectional shape of the cylindrical body 1, and the main body 14 is slidably fitted into the cylindrical body 1.
The main body 14 is provided with an elastic feeler 15 on one side in the sliding direction, and the engager 16 at the free end slides within the groove 4 and elastically engages with the stepped portion 6 . When the stepped portions 6 are provided on both wall surfaces 5 of the groove 4, it is preferable to provide a pair of antennae 15 and an engaging element 16 for each pair, but these may be provided only on one side. Reference numeral 17 is a U-shaped electrode spring with contact parts 18 at both ends, and is accommodated and supported in recesses 19a on both sides of the chamber 19 of the main body 14, and in this state both contact parts 18 are opened in the notches 20 on the side of the main body 14. It projects outward from the side surface of the main body 14 through the window 21, and the dimension between both contact portions 18 is larger than the dimension between the electrode plates 10 and 12. Therefore, when the main body 14 is fitted into the cylindrical body 1, depending on the position of the cylindrical body 1, the electrode spring 17 is inserted between the inner wall 22 of the cylindrical body 1 and the long electrode plate 12,
Alternatively, both electrode plates 10 and 12 are compressed to achieve good contact. 23 is a protrusion of the main body 14 that protrudes into the groove 4 of the cylindrical body 1. Although not shown, when a composite pipe is fitted to the cylindrical body 1, the through hole of this pipe is aligned with this protrusion 23, and it is removed from the outside. By fitting the handle 24 into this protrusion 23, it is adapted to receive operating force from fingers. Therefore, the stepped portion 6 and the engaging element 1
6. The positional relationship between both contact portions 18 and the long and short electrode plates 12 and 10 is as follows. One of the contact portions 18 is always in contact with the long electrode plate 12 during the entire sliding stroke of the main body 14. That is, the other circuit 11, which is the high impedance side, is always in a conductive state. When the main body 14 slides and the engager 16 engages with the step portion 6 farther from the short electrode plate 10,
Since the other contact portion 18 is located apart from the short electrode plate 10, only the circuit 11 on the high impedance side is conductive, and the circuit 9 on the low impedance side is in a non-conductive state. When the main body 14 is slid and the engager 16 engages with the step portion 6 closer to the short electrode plate 10,
The other contact portion 18 contacts the short electrode plate 10 .
Therefore, circuits 11 and 9 with both high and low impedances become conductive, forming a parallel circuit of high resistance R _H and low resistance R _L , but under the condition that R _H ≫ R _L , a hybrid resistance
Z ₀ becomes almost equal to the low resistance R _L , and the circuit is established in a state where it is not affected by the high resistance R _H.

In the drawing, 31 is a fitting groove of the electrode plate 10, and 32 is a fitting groove of the electrode plate 10.
34 is a fitting groove of the electrode plate 12, and 35 is the electrode plate 1.
2 protrudes through the notch 36 of the stopper 2 to the rear thereof and is connected to the circuit 11, 37
39 and 40 are electrode plates 10 that fit closely into the inside of the cylinder 1, respectively, where the electrode plate 12 is bent at its back side through the notch 38 of the stopper 3 and connected to the conductor 13. and 12 presser projections.

In the illustrated switch, electrode plates 10 and 12 are arranged opposite to each other on a cylindrical body 1, and a main body 14 equipped with a U-shaped electrode spring 17 is slidably fitted from one end of the cylindrical body 1 with the electrode spring 17 being compressed. Next, the stoppers 2 and 3 are fitted to both ends, the electrode plate 10 is connected to the circuit 9, and the electrode plate 12 is connected to the circuit 11 with respect to the conductor 13. This cylinder 1
and the circuit 8 are fitted into a composite pipe, and the handle 24 is fitted into the protrusion 23 through the through-hole of the pipe to complete the probe switch. By sliding the main body 14 using the handle 24 and engaging the engager 16 with one of the step portions 6, the low impedance circuit 9 having the short electrode plate 10 can be turned on and off.

According to the present invention, long and short electrode plates are arranged oppositely in a cylinder made of insulating material, and a plurality of engagement steps are formed on the long groove wall surface of the peripheral wall, and the dimension between the outer ends of the contact part is larger than the dimension between both electrode plates. A main body made of an insulating material, in which a type electrode spring is accommodated and supported in a recess in a chamber, is slid into this cylinder, and the engager at the free end of the elastic antenna of this main body is brought into elastic contact with the groove wall surface of the cylinder, and the engagement is made. One of the contact parts of the U-shaped electrode spring is interrupted by a short electrode plate depending on the engagement position of the interlock and the engagement step, so the U-shaped electrode spring can be easily and securely supported on the main body, and the front and rear of the main body can be easily and reliably supported. The circuit can be switched by sliding operation in the direction, so only one terminal is required for circuit switching, and since molded parts can be used, extremely accurate small parts can be obtained, and the switch itself can be made very compact. It has various effects, such as being able to provide it at a low price.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway exploded perspective view of the switch according to the present invention, and FIG. 2 is a partially cutaway bottom view of the main body. 1... Cylindrical body made of insulating material, 2, 3... Stopper made of insulating material, 4... Groove, 5... Wall surface, 6... Step part, 8
...Parallel circuit, 9...Low impedance side circuit,
10...Short electrode plate, 11...High impedance side circuit, 12...Long electrode plate, 13...Conducting wire, 1
4...Main body made of insulating material, 15...Elastic antenna, 16...
...Engagement element, 17...U-shaped electrode spring, 18...Contact portion, 19...Chamber, 19a...Recess.

Claims (1)

[Scope of utility model registration request] Low impedance circuits with high and low impedances are installed in a cylinder made of insulating material, which has stoppers made of insulating material at both ends and a groove along the longitudinal direction on the circumferential wall, and a plurality of steps in the groove direction on the wall surface of this groove. A short electrode plate connected to the side and a long electrode plate connected to the high impedance side and connected to the conductor at the other end are installed oppositely.
The engaging element at the free end has an elastic feeler that elastically engages with the stepped part, and a U-shaped electrode spring is housed and supported in a recess in the chamber, and the contact parts at both ends of this spring protrude to the outside, and the dimension between the outer ends is A main body made of an insulating material, which is larger than the dimension between the two electrode plates, is slidably inserted into the cylindrical body by springing the spring, and its handle is made to protrude outward from the groove, and the slide of the main body causes the engagement member to step. An oscilloscope probe switch that opens and closes the low impedance side circuit depending on the engagement position with the oscilloscope probe.