Bloody LK Optical switch

By Xah Lee. Date: . Last updated: .

Bloody LK Optical switch is used in Bloody B840 Optical Switch Keyboard. It is the first that made optical switch popular.

Bloody LK Optic 2 switch

LK optical switch JFJ7
Bloody LK optical switch
  • Switch type Linear
  • Sense method Optoelectronic
  • Rated lifetime 50 M
  • Pretravel 1.5 mm
  • Total travel 3 mm

“LK Optic 2” refers to a clicky switch from Bloody. In English, Bloody still call it “LK Optic” (and refer to Light Strike Technology, of which “LK” is an abbreviation, instead of Light Strike 2 Technology) while in Chinese it is referred to as “LK二代光轴” (LK II optical switch), “LK2光轴” (LK2 optical switch), “LK光轴” (LK optical switch) or simply “光轴” (optical switch).

The switch is unusual in having a design that is totally new, resembling no other known switch. The internal mechanism is of a curious and unclear design, and one that is described as clicky and offering a “machine gun” sound.

“Key response” is given as 0.2 ms, citing an 18–30 ms “delay” due to contact bounce in metal contact switches. Contact bounce is typically given by manufacturers as 5 ms maximum, and it is not clear where the 18–30 ms comes from.

It is likely that the switches accept Cherry MX mount keycaps, but this is not confirmed.

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