JPH0542581Y2 - - Google Patents

Description

[Detailed explanation of the invention] (a) Industrial application field This invention is applicable to, for example, VTRs, video discs,
This invention relates to a three-stage contact switch applicable to other audio equipment, etc.

(B) Prior Art Currently, three-stage changeover switches applied to VTRs, cameras, etc. do not normally exist as a single item. Three-stage changeover switches that have been applied in the past have various configurations depending on the application state. However, switch components such as terminals and movable contacts constituting any of the first, second, and third contacts are fixed to the internal frame of the camera body, or are not incorporated into the camera body. It is integrally constructed.

An example of such a switch is a three-stage changeover switch (not shown) applied to a camera, for example. A push shaft is provided that protrudes in this direction, and a pair of terminals are arranged at a constant interval on this head part, while a first fixed terminal is provided inside the camera body corresponding to this shutter head. Below the first fixed terminal piece, a common terminal and a second fixed terminal piece are attached vertically in parallel with each other via an insulator. Furthermore, below this second fixed terminal piece,
A third fixed terminal piece is provided via a conductive plate of a curved leaf spring.

Of the pair of terminals of the shutter head, the lower end of one terminal is extended into the case and brought into contact with the first fixed terminal piece, and the lower end of the other terminal is similarly brought into contact with the common terminal. Further, the push shaft of the head is configured to be positioned above the conductive plate of the third fixed terminal piece.

When switching the switch, when you touch the shutter head with your finger, the two terminals (between a pair of terminals) exposed on the top surface of the head become conductive through your finger, and the first fixed terminal and the common terminal come into electrical contact. Then, the first contact is connected. This causes, for example, a power switch to be turned on. Next, when the shutter head is pushed slightly downward, the lower end of the lower terminal of the head presses down on the common terminal piece and comes into contact with the second fixed terminal piece located below. As a result, the second fixed terminal and the common terminal are electrically connected, and the second contact is inserted. In other words, for example, a shutter preparation signal is input here. When the head is further pushed in, the push shaft of the head descends, and the tip of the shaft pushes down the conductive plate against the spring, bringing the conductive plate into contact with the third fixed terminal, establishing conduction between the third fixed terminals. Then, the third contact is inserted. In other words, the shutter is turned on.

(c) Problems to be solved by the invention The structure of the above three-stage changeover switch consists of the first contact,
The fixed terminals and movable contact pieces that make up the second and third contacts are either integrated with other internal parts of the device (camera) or separately attached and fixed to the frame, and can be used as a single piece as a switch mechanism. It doesn't exist.

For this reason, the switch structure is complex and has a large number of parts, which contributes to a rise in product costs.In addition, in the event of a failure, it is time-consuming to remove the failed part from inside the device. However, the disadvantage was that it was difficult to replace parts.

Therefore, the applicant separately provided fixed terminals of different heights on the side wall of the casing-like base, and provided a sliding contact that slidably contacts each fixed terminal on a plunger that moves up and down within the base. We proposed a so-called sliding type single-piece three-stage changeover switch.

According to this switch, it is possible to provide a switch that has a small number of parts, is inexpensive, and is easy to repair.
Each contact is inserted by sliding the sliding contact on the surface of each fixed terminal, thereby providing a switch in which the contact pressure is constant and the contact is electrically stable.

However, in the above-mentioned sliding type single switch proposed by the applicant, the sliding contacts simply slide on the surface of each fixed terminal, so the operator feels a so-called click to confirm that each contact is engaged. It is something that cannot be perceived. However, depending on the application or the taste of the operator, there are cases where a user wants to feel a click every time the switch is turned on, and the above-mentioned switch could not meet such demands.

This idea solves the above problems,
To provide a single switch having a simple structure and having a click feeling (conduction feeling of a contact) that allows an operator to sense that a contact is engaged.

(d) Means and action for solving the problem In order to achieve this purpose, the switch of this invention has the following configuration.

The switch consists of a casing-like base with an upper opening and a bottom, and a vertical part and a horizontal part, respectively, where the vertical part is formed on one inner wall surface of the casing-like base, and the horizontal part is formed on the inner wall surface of one side of the casing-like base. a common terminal, a first fixed terminal, a second fixed terminal, and a third fixed terminal protruding outward from the bottom of the casing-shaped base; a leaf spring provided on the other inner wall of the casing-shaped base; and a leaf spring provided on the other inner wall of the casing-shaped base. the common terminal, a first fixed terminal at one end;
A common sliding contact, a first sliding contact, which independently slides into contact with the second fixed terminal and the third fixed terminal,
A push button that includes a second sliding contact and a third sliding contact, and a presser piece that corresponds to the leaf spring at the other end, and a return force that urges the push button toward the upper opening of the housing base. It consists of a spring and a cover that protrudes the operating shaft portion of the push button and closes the opening surface of the base, and is formed so that the common terminal and the common sliding contact are always in contact with each other when the push button is depressed. , the first fixed terminal and the first sliding contact, the second fixed terminal and the second sliding contact, and the third fixed terminal and the third sliding contact, the first fixed terminal,
The vertical portions of the second fixed terminal and the third fixed terminal are formed to have different heights, and the plate spring is configured such that when the second fixed terminal and the third fixed terminal come into contact with each sliding contact, the holding piece is It is configured by providing an upper bent step portion and a lower bent step portion that are in contact with each other.

In a switch having such a configuration, the common terminal and the common sliding contact are always in contact with each other, and the other first fixed terminal, second fixed terminal, and third fixed terminal are connected to the first sliding contact, respectively. It is not in contact with the second sliding contact and the third sliding contact.

Now, when the operating shaft of the push button is pushed down against the return spring, the push button will descend. That is, the common sliding contact, the first sliding contact, the second sliding contact, and the third sliding contact fixed to one end of the push button slide down along one side wall of the housing base. At this time,
The first sliding contact contacts the first fixed terminal, and the first contact becomes conductive.

Furthermore, when pressing the operating shaft, the second sliding contact
It contacts the fixed terminal and the second contact enters. At this time, at the same time, the push piece protruding from the other end of the push button comes into contact with the first (upper) bent step of the leaf spring projecting from the other side wall of the base, and presses the leaf spring to bend this upper part. Pass through the step. This acts as an operating load on the operating shaft, and the operator feels a click.
It senses that the second contact has been made.

Then, when the operating shaft portion is pushed further, the third sliding contact contacts the third fixed terminal, the third fixed terminal and the common terminal contact, and the third contact enters. At this time, the pushing piece comes into contact with the second (lower) bent step of the leaf spring, presses the leaf spring, and pushes the leaf spring toward the side wall of the base so that it passes. This acts as a sudden operating load on the operating shaft, and the operator feels a click and perceives that the third contact has been engaged.

(E) Embodiment FIG. 2 is an exploded perspective view showing a specific embodiment of the switch according to this invention.

The switch has multiple terminals 11, 12, 13, 1
4 and a plate spring 2, a housing-like base 1 with an upper opening and a bottom is installed in the accommodation space of this base 1 via a return spring 3, and has a plurality of sliding contacts at one end and a presser piece 47 at the other end. The push button 4 includes a push button 4 and a cover 5 that allows the operating shaft portion 42 of the push button 4 to protrude and closes the upper opening surface of the base 1.

As shown in the cross-sectional view of FIG. 1, the casing-like base 1 is formed into a casing-like shape using a hard synthetic resin material, and has a common terminal 11 and a first fixed terminal 1 on the inner surface of one side wall.
2. The third fixed terminal 13 and the third fixed terminal 14 are arranged at regular intervals, and a disc-shaped protrusion 15 is provided protruding from the center of the bottom surface.

Each terminal 11, 12, 13, 14 consists of a vertical part and a horizontal part, and as shown in the cross-sectional view in Figure 3, the vertical part is buried on one side of the inner wall surface with the surface of the terminal flush with the other. (insert molding), and one horizontal portion projects from the bottom of the base 1 in the horizontal direction to the outside. And each of these terminals 11, 12,
13 and 14 are located at different heights, as shown in the cross-sectional view of FIG. For example, the common terminal 11 is set to have almost the same height as the side wall of the base 1, the first fixed terminal 12 is set slightly shorter than the common terminal 11, and the second fixed terminal 13 is set to be shorter than the first fixed terminal 12. The third fixed terminal 14 is short.
By setting the height lower than the fixed terminal 13 and making the height positions of the terminals different, sequential switching of the sliding contacts is realized.

In addition, a leaf spring 2 is provided on the inner surface of the other side wall of the casing-like base 1.
is stuck. As shown in the cross-sectional view of FIG. 1, this leaf spring 2 has a U-shaped cross section made by bending a flat metal plate inward at the center, and attaches one side of the U-shaped bent piece to the side wall of the base 1. Fix and base the other side 1
It is arranged so as to protrude slightly inwardly from the side wall of. As shown in FIG. 4, at the tip (lower end) of this inclined surface part, there is an upper bent step 21 that projects inwardly from the base 1, and an upper bent step 21 that is continuous with the lower side of this upper bent step 21. Lower bending step part 2 in condition
2 is provided. This leaf spring 2 is set to constantly bias the base 1 inward.

The upper bent step portion 21 of this leaf spring 2 is
The lower bent step portion 22 is set corresponding to the upper end height position of the second fixed terminal 13 , and the lower bent step portion 22 is set corresponding to the upper end height position of the third fixed terminal 14 .

Further, the base 1 has mounting flanges 16, 16 projecting from the lower ends of both end walls, and a guide groove 17 for guiding the vertical movement of a push button 4, which will be described later, is formed on the inner surface of both end walls. Further, in the center of the bottom surface of the base 1 (the outer circumference of the protrusion 15), there is a fitting groove 18 into which one end of the return spring 3, which will be described later, is fitted.
has been established.

As shown in the sectional view of FIG. 1, the push button 4 has an operating shaft portion 42 projecting from the upper surface of a horizontal board 41, and the common terminal 11 and the first fixed terminal are provided at one end of the horizontal board 41. 12, a common sliding contact 43, a first sliding contact 44, and a second sliding contact 4 that come into sliding contact with the second fixed terminal 13 and the third fixed terminal 14, respectively.
5 and a third sliding contact 46 are provided protrudingly. Each of the sliding contacts 43, 44, 45, and 46 has a U-shaped cross section, and its tip is bent slightly outward, and is set to come into contact with the corresponding terminal at this bent portion. has been done.

In addition, a push piece 47 is provided at the other end of the horizontal board 41 to project downward, so that when the push button 4 is lowered,
That is, the second fixed terminal 13 and the third fixed terminal 14
are the second sliding contact 45 and the third sliding contact 4, respectively.
6, this presser piece 47 presses the plate spring 2
It is in contact with the bent step portions 21 and 22 of and is pressed so as to pass through.

This push button 4 is housed in the accommodation space of the base 1 so that each sliding contact 43, 44, 45, 46 corresponds to each terminal 11, 12, 13, 14, and the other end of the return spring 3 is fixed to the groove 18 of the base 1, and one end is fixed to the horizontal substrate 41, so that it is always biased upward.

The cover 5 has a window hole 52 opened in the plane of a flat substrate 51 having a size that matches the upper opening surface of the base 1, through which the operation shaft part 42 is inserted. In addition, leg pieces 53 are provided in the center of both ends of the board 51 in a downwardly protruding manner.
A fitting hole 54 is provided in the center of the side wall (the protruding wall of the flange 16) into which the engaging protrusion 19 is fitted.

In a switch having such a configuration, as shown in FIG.
are in constant contact with the other first fixed terminal 1
2. The second fixed terminal 13 and the third fixed terminal 14 are
They are not in contact with the first sliding contact 44, the second sliding contact 45, and the third sliding contact 46, respectively.

Now, move the operating shaft part 42 of the push button 4 to the return spring 3.
When pressed down against this, the push button 4 descends.
That is, a common sliding contact 43, a first sliding contact 44, and a second sliding contact 45 fixed to one end of the push button 4.
A third sliding contact 46 slides down along one side wall of the housing base 1. At this time, the first sliding contact 4
4 comes into contact with the first fixed terminal 12, the common terminal 11 and the first fixed terminal 12 are electrically connected, a first contact is made, and a first switching operation is performed here.

Furthermore, when pressing the operating shaft portion 42, the second sliding contact 45
contacts the second fixed terminal 13, the common terminal 11 and the second fixed terminal 13 are electrically connected, and a second contact is inserted. This means that the second switching operation has been performed. At this time, at the same time, the presser piece 47 protruding from the other end of the push button 4 comes into contact with the upper bent step 21 of the leaf spring 2 that protrudes from the other side wall of the base 1, and presses the leaf spring 2 to release the base. Push it towards one side wall,
pass. This acts as an operating load on the operating shaft portion 42, and the operator can feel a click feeling that confirms the conduction state of the second contact, as shown in FIG.

Further, when the operating shaft portion 42 is further pushed in, the third sliding contact 46 comes into contact with the third fixed terminal 14 . Thereby, the common terminal 11 and the third fixed terminal 14 are electrically connected. Thus, the third switching operation has been performed. At this time,
The presser piece 47 of the push button 4 that has climbed over the upper bent step 21 descends along the leaf spring 2 and comes into contact with the lower bent step 22, pressing the leaf spring 2 and pushing it toward the side wall of the base 1. ,pass. This acts as an operating load on the operating shaft portion 42, and the operator feels a click feeling that can confirm the conduction state of the third contact, as shown in FIG. In this state, the lower surface of the horizontal base plate 41 of the push button 4 comes into contact with the protrusion 15 of the casing-like base 1, and the sliding movement is stopped.

Furthermore, when you release your finger from the operating shaft portion 42, the push button 4 returns upward due to the biasing force of the return spring 3.
The switch returns to the normal state shown in FIG.

(f) Effects of the invention According to this invention, terminals of different heights are arranged on the inner surface of one side wall of the casing-like base, and a conductive click feeling is given to the second and third contacts on the other side wall surface. A leaf spring with a bent step is provided, a sliding contact is provided at one end of the push button to make sliding contact with each terminal, and a presser piece corresponding to the bent step of the leaf spring is protruded from the other end. As a result, it is possible to provide a single switch that realizes three-stage contact switching with a small number of parts, a small size, and a simple structure.

Moreover, when the push button slides inside the casing-like base, it is possible to detect that the second and third contacts are engaged.
The operator can sense it from the operating load applied to the operating shaft. Furthermore, since the first, second, and third contacts all conduct in a sliding manner, it is possible to provide an electrically stable switch with constant contact pressure, and the horizontal part of each fixed terminal is not exposed to the outside. Because it is protruded towards the
It has excellent effects that achieve the purpose of the invention, such as surface mounting, ease of incorporation into other equipment, and easy wiring.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of the embodiment switch, FIG. 2 is an exploded perspective view of the embodiment switch, FIG. 3 is a sectional view of the housing base, and FIG. 4 is an enlarged side view of the leaf spring. FIG. 5 is a connection diagram showing the normal connection state of the switch, and FIG. 6 is an explanatory diagram showing the operating load on the contacts. DESCRIPTION OF SYMBOLS 1... Housing-shaped base, 2... Leaf spring, 3... Return spring, 4... Push button, 5... Cover, 11...
...Common terminal, 12...First fixed terminal, 13...Second fixed terminal, 14...Third fixed terminal, 21...Upper bending step, 22...Lower bending step, 43...Common sliding Contact, 44...first sliding contact, 45...second sliding contact, 46...third sliding contact, 47...pressing piece.

Claims (1)

[Scope of utility model registration request] It consists of a bottomed casing base with a top opening and a protrusion on the bottom, and a vertical part and a horizontal part, where the vertical part is formed on the inner wall surface of one side of the casing base, and the horizontal part is formed on the inner wall surface of one side of the casing base. a common terminal, a first fixed terminal, a second fixed terminal, and a third fixed terminal protruding outward from the bottom; a leaf spring provided on the other inner wall of the casing-like base; and a leaf spring disposed within the casing-like base. a common sliding contact, a first sliding contact, and a second sliding contact, each having sliding contact at one end with the common terminal, the first fixed terminal, the second fixed terminal, and the third fixed terminal, respectively;
and a push button having a third sliding contact and a presser piece corresponding to the leaf spring at the other end, a return spring that urges the push button toward the upper opening of the casing base, and the push button. protrude the operating shaft of the
a cover that closes the opening surface of the base, the common terminal and the common sliding contact are formed so as to be in constant contact with each other when the push button is depressed, and the first fixed terminal, the first sliding contact, and the second The fixed terminal and the second sliding contact, and the third fixed terminal and the third sliding contact, have different heights of the vertical parts of the first fixed terminal, the second fixed terminal, and the third fixed terminal so that the third fixed terminal and the third sliding contact sequentially contact each other. and the plate spring has a second fixed terminal and a third fixed terminal.
A switch characterized in that an upper bent step and a lower bent step are provided with which the holding piece comes into contact when the fixed terminal and each sliding contact come into contact.