KENAPA ADA TONJOLAN PADA TOMBOL F DAN J DI KEYBOARD?

KENAPA ADA TONJOLAN PADA TOMBOL F DAN J DI KEYBOARD - Anda punya PC Dekstop atau LAPTOP? Coba Anda lihat dan raba pada tombol F dan J di keyboard. Sekarang coba Anda lakukan hal yang sama selain pada tombol F dan J. Ada sesuatu yang bedakah? Iya benar, ada sebuah tonjolan kecil pada tombol F dan J.

Pernah terpikirkankah kenapa ada sebuah tonjolan kecil pada tombol F dan J? Mungkinlah ada salah cetak/ produksi? atau buat variasi saja? atau atau yang lain?

Berikut beberapa jawaban hasil berselancar dalam dunia maya (browsing/surfing):

People who touch-type (type without looking) use these two ridges to determine the position of their fingers on the keyboard. Touch typists put the index finger of their left hand on F and the index finger of their right hand on J before they type so they know where their fingers are at. - nicepuddin in yahoo answers 

The 'F' and 'J' keys have bumps so that you can feel them. If you know where these 2 keys are, you can find all the other letters by feel. For "Touch typing" you put your left pointer finger over the 'F' and your right pointer finger ofer the 'J'. However, this isn't good enough for some people. The reasons why varies. Some people work with their hand and have developed callouses. Other times, the keyboard's bumps are too tiny or may have been worn down. Other times, people use the number keys or the function keys and need "Bumps" on them to find them without looking down. Some people with low vision use them as well to help them type better. - keyboardbumps

The bumps or nipples found on the F and J keys on the keyboard helps users correctly position their left and right hand on the keyboard without having to look at the keyboard. For example, without looking at your keyboard you should be able to feel the keyboard and correctly position your left index finger on the F and the right index finger on the J, which then positions all the remainder of your fingers in the correct position. - computerhope

As the keyboard developed, there have been several inventions intended to improve the accuracy and speed of typing.
The F and J keys (used as "home keys") often have small raised bumps on their tops or bottoms. These are tactile aids for the typist. The locations of all the other keys on the keyboard are learned in relation to these "home keys" so the touch-typist must be able to find the home keys by touch.
The inventor of the small raised bumps on the F and J keys, as well as other enhancements to other keys, is JUNE E. BOTICH (United States Patent 6667697). The abstract of her invention reads as follows:
"The invention is directed to an improvement or enhancement of a keyboard. Particularly, the keys of a keyboard are enhanced or modified, to improve or instill a tactile sensation to a person doing the typing. In this respect, certain of the keys are modified by adding tactile edges to the keys, typing school and instructors and instructions for the beginners instruct the learners to place their fingers in the middle row of the lettered keyboard. Instructions further advise to divide this middle row into two groups, one for the left hand and one for the right hand. Both groups involve the four fingers of each group excluding the thumb. The four fingers of the left hand will be placed over the letters A through F and the fingers of the right hand are placed over the letters J, K, L including the semi colon. The outside edges of the key letter A of the left hand and on the semicolon key of the right hand have outside raised edges placed thereon. This way the four fingers of the left hand and the four fingers of the right are sort of cradled between the raised edges and gives the typist a tactile sensation indicating where exactly the fingers are placed on the keyboard which enhances the speed and the accuracy of the person doing the typing." - RetroRay in yahoo answers 

Berdasarkan 3 jawaban dari hasil surfing/ browsing di atas, maka dapat ditarik kesimpulan kenapa ada tonjolan pada tombol F dan J.

1. Tonjolan tersebut memang sengaja di buat.

2. Tujuan/ fungsi dari tonjolan tersebut sebagai penanda untuk memudahkan dalam proses pegetikan. Seorang touch-type (mengetik tanpa melihat), mengandalakan tonjolan ini untuk membantu mereka menentukan (mengetahui) lokasi jari-jemarinya (keberadaan jari-jemarinya di letakkan).