JPS5917056Y2 - Piezoelectric keyboard switch - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a keyboard switch, particularly a piezoelectric type keyboard switch, which is widely used in keyboard input devices or various operation consoles in the information processing field.

Input/output devices are located at the interface of machine-human interaction, so
Consideration is important regarding ergonomic factors.

Particularly when it comes to keyboard operations, there are many problems in a wide range of areas such as design, operability, and noise pollution.

In general, this type of equipment is used in a relatively quiet environment and the work is monotonous, so the noise that comes with it has a large negative impact on the mind.

Conventionally, in snap-action or piezoelectric drive mechanisms that utilize the attractive force of magnets, the magnetic attracting plate moves when the repulsive force of the coil spring overcomes the attractive force of the magnetic attracting plate and the magnet. It has been devised as follows.

When restoration occurs, the attraction force of the magnet is used and metals collide, so noise prevention has traditionally been a major issue.

In this invention, when the key top attached to the upper end of the plunger is pressed and the repulsive force of the elastic member in contact with the lower end exceeds the attraction force of the donut-shaped magnet, the magnetic attraction plate moves and returns to its original position. To provide a piezoelectric keyboard switch in which a magnetic attraction plate is attracted to a donut-shaped magnet via a buffer member that overcomes the repulsive force of an elastic member and reduces impact noise.

That is, an object of the present invention is to provide a piezoelectric keyboard switch that can reduce the noise generated when the magnetic suction plate returns and collides with the donut-shaped magnet as the plunger and key top return.

Next, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 is a cross-sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of the main components, Fig. 3 is the attraction force characteristics of the magnetic adsorption plate and donut-shaped magnet, and Fig. 4 is the movement of the adsorption plate. Characteristics of stroke and impact energy, FIG. 5 shows key press characteristics from 1 to low.

First, in FIGS. 1 and 2, reference numeral 1 denotes a housing that accommodates a key component.

A plunger 2 slides on the inner surface of the housing 1 by pressing a key top 3 attached to one end, that is, the upper end, and controls the repulsive force of the elastic member 4 that is in contact with the other end, that is, the lower end. have a role.

Reference numeral 5 denotes a donut-shaped magnet (hereinafter referred to as magnet 1), which is provided with a hollow portion and a concentric countersunk groove portion as shown in FIG. 2 5a.

The magnet 5 is pushed into the opening at the lower end of the housing 1 and fixed with claws 1a and lb.

Reference numeral 6 denotes a suction plate, which is composed of two parts: a rod 6b fixed through the center of a magnetic disk 6a.

The lot 6b is for controlling the dynamic posture of the suction plate 6, and is provided through a guide hole 1C provided in a part of the housing 1.
slide.

Reference numeral 7 denotes a buffer member for reducing the impact force and noise generated when the suction plate 6 is attracted to the magnet 5 and collides with it.

Next, the operation of the embodiment of the present invention constructed as shown in FIGS. 1 and 2 will be described using characteristic data and the like.

When key 1 to 3 is pressed down, plunger 2 descends,
The elastic member 4 presses the suction plate 6 that is attracted by the magnet 5.

When the pressing force exceeds the attraction force of the magnet 5, the attraction plate 6
is vibrant.

The return of the dynamic stroke of the suction plate 6 is caused by the magnet 5.
There are limitations as it depends on the suction power.

In particular, since the buffer member 7 is provided in this embodiment, it is necessary to understand the relationship between the dynamic stroke of the suction plate 6 and the impact energy that affects the suction force characteristics and the output voltage of the piezoelectric keyboard.

The output voltage efficiency of the piezoelectric keyboard depends on the impact energy of the suction plate 6.

This impact energy depends on the moving speed and stroke of the suction plate 6.

Furthermore, the speed of movement of the suction plate 6 has a large effect on the snap-action feel of key operations.

The speed of this movement increases significantly in a region where the attraction force of the magnet 5 is greatly attenuated with distance, and as is clear from FIG. 3, the smaller the gap with the suction plate 6, the more advantageous it is.

However, if the buffer member 7 is made thinner, it becomes less effective in countering impact noise.

Therefore, the cushioning member 7 is held in the counterbore groove portion 5a provided in the hollow portion of the magnet l-5, and the gap between the suction plate 6 and the magnet 5 can be made small around the outer periphery thereof.

In FIG. 4, the push-down blade is 66 gr, and the shaded area is the design range of the embodiment of the present invention.

Furthermore, since there is a limit to the dynamic movement of the suction plate 6 due to its return and its relationship, the relationship with the impact energy is determined as shown in FIG.

The key press characteristics of the specified specifications were designed based on the above-mentioned data while balancing the target value for reducing the radiated energy of impact noise.

An example of the pressing characteristics is shown in FIG.

That is, in FIG. 5, point a is the initial pressing blade, point b is the start point of the suction plate 6, point C is the maximum stroke position, and point d is the return point of the suction plate 6, and the operating direction is along the arrow.

Also, the collision noise between the magnet 5 and the suction plate 6 is absorbed by the buffer member 7.
The goal was to reduce the radiated energy by about a month depending on the presence or absence of the buffer, and as shown in Figure 6, the comparison between graph ■ (with buffer member 7) and graph ◎ (without buffer member 7) shows that it is almost satisfied. I can see that it is having an effect.

This data also includes the collision sound of the suction plate 6 in the pressing direction when a single key is pressed repeatedly.

Therefore, the level of the collision sound when the suction plate 6 returns is slightly lower than this data.

As explained above, according to the present invention, Magnet! The noise that accompanies the operation of the piezoelectric keyboard switch utilizing the attraction force characteristic of -5 can be reduced by applying an appropriate buffer member 7.

[Brief explanation of drawings]

Fig. 1 is a sectional view of an embodiment of the present invention, Fig. 2 is a perspective view of the main components of an embodiment of the invention, Fig. 3 is the attraction force characteristics of the suction plate and magnet, and Fig. 4 is the suction plate of the suction plate. The dynamic stroke and impact energy characteristics, FIG. 5 shows the key press car stroke characteristics, and FIG. 6 shows the impact energy and noise level characteristics. Graph ■ shows the case with the buffer member 7, and graph ◎ shows the case without the buffer member 7. 1...housing, la, lb...housing claw,
1C... Guide hole, 2... Plunger, 3... Key top, 4... Elastic member, 5... Magnet I., 5
a... Counterbore groove portion, 6... Adsorption plate, 6a... Magnetic disk, 6b... Lot, 7... Buffer member.

Claims (1)

[Scope of utility model registration request] a donut-shaped magnet fixed in a housing and having a solid countersunk groove portion concentric with a central hole on its bottom surface; and a key attached to one end of the housing from the outside so as to approach the top surface of the donut-shaped magnet. a plunger that is slid vertically along the inner surface of the housing by pressing the top; and a rod that is fixed to a rod that is inserted into a guide hole bored in the housing along the sliding direction of the plunger Donut-shaped magnets 1~
A suction plate that is attracted to the lower surface of the plunger and the other end of the plunger are disposed through the center hole of the donut-shaped magnet, and when the plunger slides, the suction plate is pressed and the donut-shaped magnet is removed. A piezoelectric keyboard switch comprising: an elastic member that is separated; and a buffer member that is disposed between the suction plate and the elastic member and that fits into and abuts the counterbore groove of the donut-shaped magnet.