Silent sounder

Computing devices such as personal computers, laptops, tablets, cellulars, and countless types of Internet-of-Thing devices are increasingly prevalent in numerous aspects of modern life. Also they have a lot of different multimedia features. All the world delays in expecting of inexpensive wearable “like-glass” computers.
Hypothetically this one computer will includes cellular- and interaction-means. One of important means is sound reproductor. But classical cellular’s speaker – is very big or loud, and small earphone is unpleasant to carry all of the day. Therefore, a bone conduction has come to help in this problem. There are exist a lot of devices based on “bone-conduction” principle.
One of the first Google’s glasses (US8553910) includes vibration transducer (marked by 182 at picture) in the role of bone-condction speaker.
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User may move posteriorly and/or superiorly, to a position illustrated by the dotted representation.
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Bone-conduction feature is known long time. There are numerous inventions at this area. That is system (DE102009050667) for prividing notifications in loud places.
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Bone conduction refers to the forwarding of supersonic oscillations or vibrations through the skull bones surrounding the organ of hearing, bypassing the middle ear.
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At US7076077 descrided the provision of a bone conduction headset.

The older invention (US2249572) offer to use encircling the head a strip of flexible self-aligning material, which hold a bone-conducting speaker. Invention have been registered at 1944, but have been  made at 1933!

That is one of speakers (US6141427) at 2000 y.

15And one of the oldest inventions is a silent sounder by J.J. Cooper (US1531543) at 1920.

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Invention relates to telegraphy for using by telegraph operators. It attaches to the head of operator. Device comprises an electromagnet, an armature and a pressure finger, which normally rest upon the operator’s temple. By the application of electric current to the magnets, the pressure may be increased for a short or a longer period (dott and dash at Morse code). In testimony whereof James J. Cooper have affixed his signature in the patent:)

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