Difference between revisions of "Alps SKCC Cream"
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| lifetime = | | lifetime = | ||
| − | | actuation force = ca. 70 gf | + | | actuation force = ca. 70 gf (estimate) |
| − | | travel = | + | | peak force = 90±25 gf |
| + | | lifetime = 3–20 M | ||
| + | | travel = 3.5±0.5 mm | ||
| + | | bounce time = 5 ms | ||
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The [[return spring]] in SKCC Cream (black switchplate) is 10.9 mm long, of 0.22 mm gauge wire, and has nine active turns. This is virtually identical to the spring in grey switchplate [[Alps SKCC Tall Cream]], indicating that they do indeed differ solely in keystem height. | The [[return spring]] in SKCC Cream (black switchplate) is 10.9 mm long, of 0.22 mm gauge wire, and has nine active turns. This is virtually identical to the spring in grey switchplate [[Alps SKCC Tall Cream]], indicating that they do indeed differ solely in keystem height. | ||
| − | Based on non-scientific keystem-to-keystem testing, SKCC Green appears to | + | The specifications for the [[Alps AKB-3420]] includes the switches. The model number for the switches is not given, but all in all examples found to date, they are SKCC Cream. An older example of this keyboard ca. 1979 specifies the switch lifetime as 3×10⁶ cycles in the product literature, while a later example from ca. 1988 specifies the switch lifetime as 2×10⁷; it is not known whether this large increase was due to greater testing time, or improvements to the design. Based on non-scientific keystem-to-keystem testing, SKCC Green appears to provide 60 gf actuation, so with the 11:9 free turn ratio of the Cream and Green return springs, the heavier SKCC Cream would be in the region of 70 gf actuation. Only the "operating force" is officially specified, at 90±25 g, which will be total travel force. |
Part SKCCBJ0001 has two separated terminal recesses with semicircular ends, just as found in [[Alps SKCC Green]] part SKCCBK0001.<ref name="Taobao-BJ0001" /> Normally there is only a single terminal recess, typically with straight ends. This version has a spring in the region of 10.3–10.6 mm long, also of 0.22 mm gauge wire, but only seven active turns. | Part SKCCBJ0001 has two separated terminal recesses with semicircular ends, just as found in [[Alps SKCC Green]] part SKCCBK0001.<ref name="Taobao-BJ0001" /> Normally there is only a single terminal recess, typically with straight ends. This version has a spring in the region of 10.3–10.6 mm long, also of 0.22 mm gauge wire, but only seven active turns. | ||
Revision as of 00:11, 10 April 2018
 | |
| Manufacturer | Alps Electric |
|---|---|
| Family | Alps SKCC series |
| Product code | SKCCBJ |
| Switch type | Linear |
| Sense method | Metal leaf |
| Rated lifetime | 3–20 M |
| Bounce time | 5 ms |
| Actuation force | ca. 70 gf (estimate) |
| Peak force | 90±25 gf |
| Total travel | 3.5±0.5 mm |
| Switch mount | Plate mount |
Alps SKCC Cream is a switch in the Alps SKCC series.
Description
The return spring in SKCC Cream (black switchplate) is 10.9 mm long, of 0.22 mm gauge wire, and has nine active turns. This is virtually identical to the spring in grey switchplate Alps SKCC Tall Cream, indicating that they do indeed differ solely in keystem height.
The specifications for the Alps AKB-3420 includes the switches. The model number for the switches is not given, but all in all examples found to date, they are SKCC Cream. An older example of this keyboard ca. 1979 specifies the switch lifetime as 3×10⁶ cycles in the product literature, while a later example from ca. 1988 specifies the switch lifetime as 2×10⁷; it is not known whether this large increase was due to greater testing time, or improvements to the design. Based on non-scientific keystem-to-keystem testing, SKCC Green appears to provide 60 gf actuation, so with the 11:9 free turn ratio of the Cream and Green return springs, the heavier SKCC Cream would be in the region of 70 gf actuation. Only the "operating force" is officially specified, at 90±25 g, which will be total travel force.
Part SKCCBJ0001 has two separated terminal recesses with semicircular ends, just as found in Alps SKCC Green part SKCCBK0001.[1] Normally there is only a single terminal recess, typically with straight ends. This version has a spring in the region of 10.3–10.6 mm long, also of 0.22 mm gauge wire, but only seven active turns.
Keyboards
- Some late model Dragon Data Dragon 32[Citation needed]
- Some Dragon Data Dragon 64
- Some Radio Shack TRS-80 Model I (1979)
- Some Radio Shack TRS-80 Model III[2]
- Some Texas Instruments TI-99/4A
Gallery
Comparison with Alps SKCC Tall Cream
Comparison with Alps SKCC Green
SKCCBJ0001
The following switches were sourced from AliExpress,[3] and are from a batch previously sold on Taobao.[1] They feature a short white switchplate. The photo of the box on Taobao includes only a small fraction of the date stamp, which appears that it may be too faint to read.
SKCCBJ0001 switches
Partially opened
Opened; note the unusual divided recess around the terminals
Opened; the switchplate guide ridge remains, even though the switchplate no longer reaches down to it
Slider and spring
Disassembled, top views; note the small pegs that the switchplate sits on
Disassembled, bottom views
Fully disassembled (switch is scuffed from being opened badly)
References
- ↑ 1.0 1.1 Taobao — 日本ALPS SKCCBJ0001 健盘开关 按键开关 复位开关 微动开关
- ↑ Deskthority — Keyboard mystery: Alps 12KC018A for TRS-80 Model III
- ↑ AliExpress — SKCC BJ0001 keyboard switch …
