At its core, keyboard structure is defined by «how the internal assembly (plate + PCB) is secured to the case.» The -Tray Mount-structure uses screws passing through the assembly, offering the lowest cost; -Top Mount- secures the plate to the top case, providing excellent typing consistency but a firmer feel; -Gasket Mount- sandwiches the assembly between gaskets for a soft, bouncy feel and is currently the mainstream choice; and -Quick-Release- structures address the pain point of tedious disassembly, significantly lowering the barrier to entry for maintenance and customization.
I. Tray Mount: The Foundation of Mass-Produced Keyboards
Tray Mount is the most common keyboard assembly method. It utilizes standardized components and simple manufacturing processes at a low cost, making it ubiquitous in mass-produced mechanical keyboards.
Its assembly logic is as follows: the bottom case features screw holes, and screws pass from the bottom through the PCB and plate to secure the entire internal assembly to the case. The PCB and plate share the same screw mounting points, allowing them to be fastened together.
The advantages of Tray Mount are low cost and high compatibility; almost all standard parts can be used directly. Its downsides include plate vibration and a lack of structural rigidity in the PCB; under heavy keystrokes, the assembly can wobble, leading to inconsistent switch feel across different areas of the keyboard. This is why some Tray Mount keyboards attempt to «simulate» a soft, bouncy feel by reducing mounting posts or adding silicone sleeves; however, the connection remains fundamentally rigid, preventing uniform deformation across the entire board.
II. Top Mount: The Price of Consistency
In a Top Mount structure, the plate is connected to the top case. Screws are driven in from above to secure the plate to the top case before the top and bottom case halves are joined.
The core advantage of this structure is **excellent typing consistency**. The internal assembly is firmly secured to the case, and keystroke force is evenly distributed across the keyboard, avoiding the «stiff center, soft edges» issue found in Tray Mount designs. Additionally, Top Mount is relatively simple to manufacture and is a common choice for high-end custom kits and pre-assembled keyboards; South Korean custom keyboard brands, in particular, favor this assembly method.
However, Top Mount also has distinct drawbacks. Because the mounting plate is rigidly connected to the case, sound waves travel directly from the plate to the case during typing, often resulting in a noticeable hollow sound. Furthermore, mounting plates usually need to be custom-made for specific kits, limiting DIY compatibility; swapping to a plate made of a different material often requires contacting the original designer to obtain the CAD files.
III. Gasket Mount: Synonymous with a Soft, Flexy Feel
The Gasket mount has become the most popular design in recent years. Its assembly logic differs entirely from «Tray Mount» or «Top Mount» designs: screws secure only the case itself, while the mounting plate is sandwiched between the top and bottom case halves. Gaskets placed around the perimeter of the plate act as a shock-absorbing layer between the top and bottom case sections.
The key feature is that the internal assembly (the mounting plate) lacks rigid structural supports or direct screw connections; instead, it is held firmly in place by the pressure of the rubber gaskets against the top and bottom case halves. Typing force is distributed very evenly, and the rubber strips provide cushioning in both the upward and downward vertical directions, resulting in a softer, more pleasant typing feel.
Gasket mounts are typically paired with mounting plates made of soft, flexible materials like PC (polycarbonate). This combination allows for gentle deformation when the keys bottom out, resulting in more controlled sound acoustics. The Keychron Q Ultra series, unveiled at CES 2026, utilizes a «Double Gasket» design combined with multiple layers of acoustic foam to further enhance the soft, flexible feel and sound quality.
However, Gasket mount designs come with higher production costs. The process involves multiple rounds of prototyping to calculate tolerances, creating molds for rubber gaskets, and selecting the optimal material hardness—steps previously undertaken only by a handful of high-end custom keyboard manufacturers. As expertise has grown, the cost of producing Gasket-mounted keyboards has been brought down to a level acceptable to mainstream consumers.
IV. Quick-Release Structure: Maintenance Without the Screwdriver
The core objective of a quick-release structure is clear: allowing users to separate the keyboard’s top and bottom case halves without the need for tools like screwdrivers.
Disassembling traditional keyboards often requires removing a dozen or even twenty screws—a particularly tedious process for «sandwich-mount» designs (featuring a middle frame). Quick-release structures aim to solve this pain point. Currently, there are two main types of quick-release solutions on the market:
– Ball-Detent Quick-Release: This is the most mainstream solution. A latch hook equipped with a spring-loaded steel ball is fixed to the top case, while a corresponding socket with a matching groove is fixed to the bottom case. When the top case is pressed onto the bottom case, steel balls slide along an inclined plane into a groove, producing an audible «click» to lock it in place; lifting upwards disengages the lock. The entire operation consists of a simple «press and lift» motion, requiring no tools.
– Magnetic Quick-Release: This utilizes the attraction of permanent magnets to secure the assembly. When the PCB and electrical components are brought together, magnetic force automatically aligns and holds them in place; some designs also incorporate alignment pins to prevent lateral shifting.
The value of a quick-release structure lies in lowering the barrier to maintenance. It facilitates internal cleaning, switch replacement, and adjustments to sound-dampening materials. It also allows for the rapid swapping of internal components like the mounting plate and PCB, while eliminating risks associated with disassembly and reassembly—such as stripped screws, broken plastic clips, or torn ribbon cables.
V. Other Structures: Niche but Distinctive
Beyond the mainstream solutions mentioned above, other structural designs appear in specific scenarios or high-end kits.
– Sandwich Mount: The mounting plate is sandwiched between the top case and the bottom case. It offers a unique bottom-out sound but demands high manufacturing precision; it is commonly found in high-end kits.
– Plateless Mount: This design omits the mounting plate entirely, with switches mounted directly onto the PCB. It provides a direct typing feel but requires greater assembly accuracy.
– Integrated Mount: The top case and mounting plate are combined into a single unit, resulting in a very firm, rigid bottom-out feel.
VI. Core Logic for Structural Selection
The four mainstream structures cater to different priority needs.
1. Budget-focused: Choose Tray Mount. With standardized design, simple manufacturing, and low costs, it is the mainstream choice for mass-produced keyboards. Drawbacks include average typing consistency and a noticeable sense of movement or wobble in the internal assembly.
2. Typing consistency-focused: Choose Top Mount. The mounting plate is rigidly fixed to the top case, ensuring uniform key-press feel—ideal for users who value stability. The trade-offs are a firmer typing feel, potential hollow resonance (cavity sound), and limited mounting plate compatibility.
3. Soft, flexible feel and sound performance-focused: Choose Gasket Mount. The internal assembly is held by gaskets that provide uniform cushioning; when paired with a polycarbonate (PC) mounting plate, it delivers soft bottom-out feedback and controlled acoustics. It is currently the mainstream choice for custom keyboards and mid-to-high-end mass-produced models. 4. Prioritize ease of maintenance and customization by choosing a quick-release design. Quick-release mechanisms—such as ball-detent or magnetic systems—allow for assembly and disassembly with a simple «press-and-lift» motion, making them ideal for enthusiasts who frequently swap switches, adjust internal dampening, or clean the keyboard’s interior.
Tips: Keyboard structure does not determine typing feel in isolation; the plate material, internal dampening materials, and switch types all interact with the structure. Even with the same gasket mount design, the typing feel can vary drastically depending on the hardness of the gaskets and the material of the plate used. Think of the structure as the skeleton and the dampening materials and components as the flesh and blood; together, they define the ultimate typing experience.
