JPS5846461Y2 - keyboard - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a keyboard with improved feel when pressing keys and improved key return springs.

A conventional keyboard was constructed as shown in FIG.

That is, the fulcrum plate 2 fixed to the tip of the chassis 1 is engaged with the fulcrum recess 4 on the lower surface of the tips of the plurality of keys 3, and the coil spring 5 is stretched between the tip of the chassis 1 and the tip of the key 3, so that the chassis 1 A tamper holding plate 8 with dampers 6.7 affixed to the upper and lower surfaces is fixed to the rear end, and an upward movement regulating piece 9 is provided on the lower surface of the rear end of the key 3, and this upward movement regulating piece 9 is attached to the damper. 7 and when the key 3 is pressed, the lower surface of the key 3 contacts the damper 6 and its downward movement is restricted, and furthermore, an actuator that controls a switch 10 attached to the lower surface of the chassis 1 is located on the intermediate lower surface of the key 3. 11 are provided.

In the keyboard configured as above, the coil spring 5 moves the key 3
As shown by the broken line in Fig. 10, the force with which the key 3 is pressed increases in proportion to the stroke of the key 30, and since the switch 10 is also a plate, it similarly increases in proportion to the stroke of the key 3. There was a problem in that the driving force increased and the feel of the keys when pressed was extremely poor.

Furthermore, after installing the keys 3 in parallel on the chassis 1, the coil spring 5
This has the disadvantage that it requires a great deal of effort to assemble, as each piece must be strung up one by one using pliers or the like.

The present invention eliminates the above-mentioned drawbacks of the prior art.

Embodiments of the present invention will be described below with reference to FIGS. 2 to 9 of the drawings.

First, in FIG. 2, reference numeral 12 denotes a chassis, and a locking window 14 for locking the tip of the key 13 is provided on the upper surface of the top end of the chassis 12. The recess 15 is engaged.

Further, a locking piece 16 is provided on the lower surface near the tip of the key 13 so as to protrude downward, and a U-shaped leaf spring 18 whose one end is engaged with the chassis 12 is inserted into the notch 17 of the locking piece 16. The other end is engaged.

Further, an upward movement regulating piece 19 is provided on the lower surface of the rear end of the key 13 and projects downward, and this upward movement regulating piece 19 is connected to the chassis 1
The key 13 is fixed to the rear end of the key 13 and comes into contact with a damper 21 provided on the bottom surface of the damper holding plate 20, and when the key is pressed, the bottom surface of the key 13 comes into contact with the damper 22 provided on the top surface of the damper holding plate 20, thereby regulating downward movement. is being carried out.

Further, an actuator 24 for controlling a switch 23 attached to the lower surface of the chassis 12 is provided on the intermediate lower surface of the key 13.

In the keyboard with this configuration, the U-shaped leaf spring 18 is assembled.
One end is engaged with the chassis 12, and the other end is engaged with the key 13.
After engaging the notch 17 of the locking piece 16 of the key 13, insert the tip of the key 13 into the locking window 14 of the chassis 12,
The assembly is completed by engaging the edge of the locking window 14.

Therefore, the curved portion of the leaf spring 18 is located on the inner surface of the key 13.

Another embodiment is shown in FIG. 3, in which an engagement groove 17' is provided in place of the notch 170 at the lower end of the locking piece 16 of the key 13, and the other embodiments are the embodiment shown in FIG. is the same as

The assembly process in this embodiment is shown in FIGS. 4 to 6.

Further, a detailed view of the U-shaped leaf spring 18 and the locking piece 16 is shown in FIG.

First, in FIG. 7, one end of the U-shaped leaf spring 18 is provided with a narrow portion 18a that engages with the chassis 12, and the other end is provided with a flat plate portion 18b that fits into the engagement groove 17'. There is.

With this configuration, the narrow part 18a of the U-shaped leaf spring 18 is engaged with the engagement hole 12a of the chassis 12, and the lower end of the locking piece 16 of the key 13 is connected to the U-shaped leaf spring as shown in FIG. 18 on the flat plate portion 18b side.

Then, as shown in FIG. 5, when the key 13 is pressed downward, the locking piece 16 slides along the slope of the U-shaped leaf spring 18.
It reaches the flat plate part 18b of the U-shaped leaf spring 18, and the flat plate part 1
8b fits into the fitting groove 17' of the locking piece 16.

Next, as shown in FIG. 6, by shifting the key 13 toward its rear end and fitting the tip of the key 13 into the locking window 14 of the chassis 12, the fulcrum recess 15 is engaged with the edge of the locking window 14. Assembly is complete.

Next, the operation of this key 13 will be explained with reference to FIGS. 8 and 9.

FIG. 8 shows the normal state in which the key is not pressed, where the restoring force of the U-shaped leaf spring 18 is Po, the point of action of the U-shaped leaf spring 18 and the key 1.
If the distance between the key 13 and the fulcrum recess 15 is Ro, the rotational moment Mo around the fulcrum recess 15 that urges the key 13 is Mo - Po XR.

becomes.

FIG. 9 shows that when the key 13 is pressed, the restoring force of the U-shaped leaf spring 18 is Pl, and the distance between the point of action of the U-shaped leaf spring 18 and the fulcrum recess 15 of the key 13 is R. The rotational moment (moment that urges) M becomes M=PXR.

At this time, the amount of deflection of the U-shaped leaf spring 18 hardly changes before and after the key is pressed, and since Po±P and Ro>R, M
o>M.

Therefore, the rotational moment after the key is pressed is smaller than the initial rotational moment.

That is, the pressing force after pressing a key can be made lighter than the initial value.

Further, even if a force is applied to drive the switch 23, the force for pressing the key 13 can be made constant with respect to the stroke of the key 130, as shown by the solid line in FIG.

Since the keyboard according to the present invention is constructed as described above, it is possible to make the key presses feel as smooth as on a piano, and the curved part of the U-shaped leaf spring is located on the inner surface of the key. In this way, both ends of the leaf spring are engaged with the key and the chassis, so this single leaf spring can perform the click action and return the key, whereas conventionally two springs were used for the click action and return the key. The structure is simpler than that of the previous model, and as a result, it is extremely easy to assemble, which is advantageous in terms of productivity.

[Brief explanation of the drawing]

FIG. 1 is a side view showing a conventional keyboard, FIG. 2 is a partially sectional side view showing an embodiment of the keyboard of the present invention, and FIG. 3 is a partially sectional side view of another embodiment of the present invention. Figures 4 to 6 are partially sectional side views showing the same assembly process, Figure 7 is an exploded perspective view of the main parts, and Figures 8 and 9 are partially sectional side views of the main parts showing the same operation. 10 are characteristic diagrams showing the relationship between the stroke and pressing blade of the conventional keyboard and the keyboard of the present invention. 12...Chassis, 13...Key, 14
...... Locking window, 15 ...... Fulcrum recess, 16
...... Locking piece, 17 ... Notch, 17'
......Fitting groove, 18...U-shaped leaf spring.

Claims (1)

[Scope of utility model registration request] A locking window is provided at the tip of the chassis, and the fulcrum recess at the tip of the key is engaged with the locking window, and one end of the U-shaped body is engaged with the chassis through a locking piece provided on the lower surface of the tip of the key. A keyboard in which the other end of a leaf spring is engaged with the curved part of the leaf spring positioned on the inner surface of the key.