This gets a little niche.
In an earlier article, “Is There a Reason for Hybrid Keyboards That Support Both Magnetic and Mechanical Switches?,” we noted that magnetic and hybrid keyboards may be more likely to face mounting-style constraints because the distance between the magnets inside the switches and the sensors on the PCB needs to remain stable.
In other words, the switch plate needs to be fixed in place to maintain a consistent distance between it and the PCB.
Taking the mechanism into account, electrostatic capacitive (EC) keyboards, like magnetic keyboards, also need to maintain a consistent distance between the surface supporting the switches and the PCB.
As a result, mounting structures that allow the switch plate to move freely relative to the PCB may be difficult to adopt, making a fixed structure more likely.
The principle used to detect key presses differs from that of magnetic keyboards, but both require a stable positional relationship between the switches’ moving and sensing mechanisms and the PCB.
REALFORCE and HHKB Professional address this constraint in different ways: REALFORCE uses a metal plate, while HHKB Professional integrates the switch support into its resin upper case.
The structures differ, but in both cases the surface supporting the switches is fixed so it cannot move relative to the PCB.
In this column, we’ll explore these points with reference to the companies’ official explanations.
Why Get Into Such a Niche Topic?
First, a little context.
You can buy a keyboard for very little if you’re not particular about what you get.
By contrast, the keyboards discussed here all come with hefty price tags, and they’re the sort of purchases that take considerable resolve.
Depending on the model, some may even become “keyboards for life.”
There probably aren’t many people who can casually spend that kind of money.
That’s why I think it’s extremely important to understand the typing feel of the keyboard you’re considering and what gives it that feel, so you won’t regret your purchase.
Without understanding how it differs from other options, it’s hard to claim that one typing feel is “the best.”
Some people like the typing feel of electrostatic capacitive keyboards; others prefer the typing feel of gasket-mounted mechanical keyboards.
That’s a matter of personal preference, so you can choose whichever you like.
Once you start thinking about why a particular keyboard feels the way it does, keyboards become even more interesting.
This may get a little long, but bear with me.
What Is Typing Feel?
Here, I define typing feel as “the sensation you feel in your fingertips when you press a switch all the way down.”
In other words, “typing feel” here refers to the sensation you get when bottoming out.
A keyboard’s typing feel is shaped by a great many interacting factors, including the input mechanism, such as the switches; plate material; sound-dampening materials; the switch plate’s mounting style; the case; and keycaps.
Among these, the switch plate’s mounting style and material carry relatively significant weight.
This article focuses on the possibility that the chosen input mechanism structurally limits the switch plate’s mounting style, suggesting that the input mechanism may largely determine the foundation of a keyboard’s typing feel: its mounting style.
Mounting Styles in Magnetic Keyboards and Keyboards with Electrostatic Capacitive (EC) Switches
Even keyboards using electrostatic capacitive switches—often considered synonymous with “high-end keyboards” in Japan—may face some constraints on their switch mounting styles, much like keyboards with magnetic switches.
Let’s take a closer look.
In electrostatic capacitive switches, a conical spring is positioned inside a rubber dome.
When a key is pressed, the conical spring deforms, and the PCB detects the resulting change in capacitance.
Image source: PFU, “What Are Key Switches? Types of Key Switches and How to Choose One”
This input mechanism is mainly made up of the following parts:
- Slider
- Housing that holds the slider
- Rubber dome
- Conical spring
- Electrode on the PCB
If the surface supporting the slider sinks relative to the PCB, the relative positions of these components also change.
This suggests that, in electrostatic capacitive switches, the distance between the slider’s support surface and the PCB needs to remain stable.
Thus, it would be fair to say that accurate signal detection presupposes a constant distance between the switch plate and PCB, allowing changes in capacitance to be detected.
In other words, there appears to be a similar constraint on mounting styles to that of magnetic keyboards: the structure needs to keep the distance between the switch plate and PCB constant.
A useful way to think of it may be that the mount is less free to move than in a typical mechanical keyboard.
REALFORCE and HHKB Secure Their Switch Support Surfaces in Different Ways
As described above, electrostatic capacitive switches appear to require a structure that minimizes changes in the distance between the switch support surface and the PCB.
The best-known keyboards in Japan that use electrostatic capacitive switches are probably the REALFORCE and HHKB Professional.
Both use the same electrostatic capacitive technology, but they support the switches differently.
- REALFORCE: Independent switch housings supported by a metal plate
- HHKB Professional: Switch housings integrated with the resin upper case
However, the difference is not whether the switches are secured or not.
They use different methods, but both keep the distance between the switch support surface and the PCB fixed.
REALFORCE Secures the Switches with a Metal Plate
In PFU’s published history of HHKB’s development, REALFORCE is described as having a structure in which each key switch is independent and mounted to a metal plate.
“With REALFORCE, basically, each individual key switch is independent and attached to a metal plate.”
Quote: HHKB Backstory, Chapter 2, Part 2 | PFU
In REALFORCE keyboards, independent switch housings are attached to a metal plate, with rubber domes, conical springs, and the PCB layered beneath it.
Topre’s official materials also explicitly state that the REALFORCE GX1 series uses a “steel frame.”
Image via: REALFORCE GX1 Plus / GX1 official product page
A teardown of the REALFORCE GX1 also shows that the PCB and key-side assembly are secured with numerous screws.
The teardown photos show the metal-plate assembly, rubber domes, conical springs, and PCB stacked together and secured with numerous screws from the PCB side.
That’s quite a lot of screws.
Still, the many fastening points show that the structure is held together as a single stack from the metal plate through to the PCB.
In other words, REALFORCE appears to use the rigid metal plate as its reference, securing the switch support surface and keeping its distance from the PCB stable.
HHKB integrates the switches with its resin upper case
HHKB Professional, on the other hand, does not have a metal switch plate like REALFORCE.
Instead, the housing that holds the sliders is molded as one piece with the resin upper case.
It seems to have a structure where the part corresponding to the switch plate is integrated with the top case.
PFU’s official development history describes it as follows:
“HHKB isn’t like that; each individual switch is integrated with the molded structure.”
Image via: PFU, “HHKB Backstage HISTORY: Chapter 2, Part 2”
In REALFORCE, the metal plate supports and positions the switches; in HHKB Professional, the resin upper case itself does that job.
Without a metal plate, its structure looks very different from REALFORCE.
However, HHKB Professional is not built so that its switch support surface can sink freely relative to the PCB.
The distance between the switch housings integrated with the upper case and the PCB beneath them is fixed.
In other words, the difference is not whether the switch support surface is fixed, but what is used to fix it.
Different structures, same principle: fixing the switch support surface relative to the PCB
The structures of REALFORCE and HHKB Professional can be summarized as follows:
| Product | How the switches are supported | Position relative to the PCB |
|---|---|---|
| REALFORCE | Independent housings supported by a metal plate | Fixed |
| HHKB Professional | Housings integrated with the resin upper case | Fixed |
REALFORCE uses a metal plate, while HHKB Professional uses a resin upper case.
However, both follow the same basic principle: rubber domes, conical springs, and the PCB are layered beneath the support surface, keeping its distance from the PCB fixed.
Rather than using “different mounting styles,” it may be more accurate to say that REALFORCE and HHKB Professional meet the same structural requirement with different support materials and fastening methods.
This commonality suggests that, as with magnetic keyboards, electrostatic capacitive keyboards need to keep the positional relationship between the switch-side input mechanism and the detection components on the PCB stable.
How a Fixed Structure Affects Typing Feel
Here, “stiffness” in typing feel refers to the sensation felt at the fingertips when a key bottoms out.
When the switch plate is firmly secured, there is very little flex to absorb the impact of bottoming out.
Because the force of the key reaching the bottom is clearly transmitted back to the fingertips, the bottom-out feel is likely to be firm.
With a typical gasket mount, the input assembly, including the plate and PCB, sinks slightly as the gasket material deforms.
Because the impact of bottoming out is dispersed by the deformation of the gasket material and flex in the plate,
it feels soft and cushioned at the fingertips.
Of course, mounting style alone does not determine the final typing feel.
Many factors are involved, including the plate’s material and thickness, the PCB, sound-dampening materials, switches, keycaps, and case.
Whether the overall structure has room to sink when bottoming out is likely to be a major factor in how firm it feels to the fingertips.
Electrostatic capacitive keyboards need to keep the distance between the switch support surface and the PCB stable.
As a result, as with magnetic keyboards, it becomes difficult to use a structure that lets the switch plate sink significantly relative to the PCB to absorb the impact of bottoming out. This seems to be one structural constraint arising from the input method.
HHKB May Use Its One-Piece Resin Structure to Soften the Firmness of Bottoming Out
REALFORCE supports its switches with a rigid metal plate.
HHKB Professional also has a fixed structure, but uses resin to support the switches.
In PFU’s development history, REALFORCE’s typing feel, with its metal plate, is described as “substantial,” while HHKB Professional, with its one-piece resin structure, is described as “soft” and “supple.”
HHKB Professional is not gasket-mounted.
Even so, using the resin top case rather than a metal plate as the support surface may create a more supple bottom-out feel than a metal plate does, while retaining the stability required by a fixed structure.
In other words, we can hypothesize that HHKB Professional “keeps the distance between the switch support surface and PCB fixed, while using resin as the support material to soften the firmness characteristic of a fixed structure” .
This may be one reason why REALFORCE and HHKB Professional do not have the same typing feel, despite using the same electrostatic capacitive technology.
Electrostatic Capacitive Keyboards Are Not Inherently Incompatible with Gasket Mounts
In a typical gasket mount, gasket material supports the input assembly, including the plate and PCB.
As the gasket material deforms, the input assembly sinks slightly, dispersing the impact of bottoming out.
So, is a gasket mount impossible with electrostatic capacitive keyboards, which need to keep the distance between the switch support surface and PCB fixed?
It is not impossible in principle.
If the switch support surface, rubber domes, conical springs, and PCB are fixed together as a single unit, and the entire unit is given some cushioning while their relative positions are maintained, this could potentially soften the impact of bottoming out.
A useful point of comparison is the Lofree Hyzen, a hybrid keyboard that supports both magnetic and mechanical switches.
Related article: A Short Review of the Lofree Hyzen: A Striking Keyboard with Standout Design
According to the product specifications Greenkeys checked, the Hyzen is listed as using “PCB Gasket + FR4 Fiberglass Plate,” and Lofree’s official page also explicitly states that it uses a gasket mount.
In a typical plate-gasket design, gasket material is placed on the switch-plate side, elastically supporting the plate inside the case.
With a PCB gasket, by contrast, the gasket material supports the PCB.
By cushioning the PCB side, the Hyzen appears to soften the impact of bottoming out without allowing the switch plate to move independently of the PCB.
This could be a way to add the softness associated with gasket mounts while maintaining the relative position of the magnet inside the switch and the TMR sensor, as required for magnetic switches.
In other words, magnetic and electrostatic capacitive keyboards are not inherently incompatible with gasket mounts.
The key is to cushion the input unit without changing the distance between the switch support surface and the PCB.
However, electrostatic capacitive keyboards need to keep the switch support surface, rubber domes, conical springs, and PCB in a consistent configuration.
The same PCB-gasket structure used in the Hyzen may not work as-is for electrostatic capacitive keyboards.
Even so, it is possible to support the PCB or the entire input unit with gaskets while maintaining the relative positions of all the components in the input mechanism.
So rather than saying that electrostatic capacitive keyboards cannot use gasket mounts, I think it is more accurate to say that their mounting structures are harder to move freely than those of typical mechanical keyboards.
The structure needs to be fixed.
But there is still room to cushion the structure as a whole.
Looking at the Hyzen’s PCB-gasket design, it seems possible that electrostatic capacitive keyboards with a different bottom-out feel could emerge.
Conclusion | A Deeply Interesting Input Method and Typing Feel
That concludes this column on the possibility that conventional electrostatic capacitive keyboards may face constraints in their mounting style.
Modular EC switches have also appeared recently, and I’m following them with interest.
I get the impression that electrostatic capacitive keyboards tend to be popular in Japan for their typing feel.
Personally, I really liked the typing feel of the HHKB 30g model.
The rubbery feel as the keys sink, combined with a bottom-out that is slightly firm yet still has some bounce—made possible by the deliberate use of a one-piece resin structure—feels uniquely HHKB to me.
That said, it’s not the only option; this is ultimately a matter of taste, and there are plenty of other keyboards whose typing feel I also like.
You really can’t know what you prefer until you try different keyboards for yourself.
By focusing on keyboards with a clear design philosophy, such as HHKB, while also exploring differences in construction and typing feel, you can better appreciate the depth of keyboards as tools.
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- First published: July 27, 2026
- Last updated: July 27, 2026
- Research method: Review of written materials
- Sources and citations: Review of written materials
- Conflict of interest: No products provided; no monetized links in this article
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