Abstract: Improved speakers are better able to accurately reproduce sound through the use of low-mass transducers.

Abstract: Casing of an electronic keyboard musical instrument includes two discrete parts: a main casing section; and a rear casing section. The main casing section includes a bottom plate having a keyboard section placed thereon, a keyslip portion extending upward from the bottom plate in front of the keyboard section, and left and right side plates extending upward from the bottom plate at left and right sides of the keyboard section. The rear casing section includes a roof plate forming a rear upper surface of the casing, and a back plate extending downward from a rear edge of the roof plate. The rear casing section is detachably attached to the main casing section by means of a slidingly-attaching structure for slidingly attaching the rear casing section to the left and right side plates of the main casing section.

Abstract: There is provided a keyboard apparatus which has a high durability, portability, and operability, and facilitates adaptation to a wide range of musical scenes and to multi-model production. Each adjacent pair of four main cases are pivotally connected to each other via connecting portions, whereby the main cases are allowed to assume a folded position which enables the keyboard apparatus to be carried with ease, and a flat unfolded position in which the keyboard can be played. Each main case has a keyboard unit arranged therein. Three main cases for lower tone ranges each have four white keys arranged therein, and a main case for a highest tone range has three white keys arranged therein, and a total of 25 keys are arranged on the keyboard apparatus. The main case for the highest tone range also has a group of operating elements arranged therein.

Abstract: Casing of an electronic keyboard musical instrument includes two discrete parts: a main casing section; and a rear casing section. The main casing section includes a bottom plate having a keyboard section placed thereon, a keyslip portion extending upward from the bottom plate in front of the keyboard section, and left and right side plates extending upward from the bottom plate at left and right sides of the keyboard section. The rear casing section includes a roof plate forming a rear upper surface of the casing, and a back plate extending downward from a rear edge of the roof plate. The rear casing section is detachably attached to the main casing section by means of a slidingly-attaching structure for slidingly attaching the rear casing section to the left and right side plates of the main casing section.

Abstract: A portable electronic musical instrument is composed of two separable units, that is an upper unit including a controlling panel and a lower unit including a keyboard. For performance, the upper unit is vertically mounted on the lower unit and for portage the upper unit is horizontally mounted on the lower unit to form a portable box like structure. Both side boards of the lower unit are inclined toward the front surface of the keyboard so as not to interfere with performers hands in playing. Base portions of side boards of the upper unit are also inclined towards the keyboard so as to stabilize the upper unit in the performable state.

Abstract: A portable electric keyboard musical instrument is disclosed which includes (1) a two-part folding supporting structure, (2) a plurality of vibratile reeds with each having an end fixedly attached to the supporting structure, (3) a plurality of actions for selectively causing respective reeds to vibrate and pickup devices used in spaced relation to the reeds for generating an electrical frequency from the vibrations of the reeds. The keyboard is contained in a hand transportable case which is foldable and serves as a support and protective assembly for the keyboard.

Abstract: A portable folding piano is disclosed which incorporates in the preferred and illustrated embodiment, a keyboard and associated keys which disengage from the hammer pickup fingers. The keyboard is pivotally attached to the piano body and may be swung to a stored position for transportation purposes. A positioning rail aligns the hammer pickup fingers for reengagement with the piano keys which are provided with a forked extension to enable repeated and accurate engagement.

Abstract: A breakdown piano is disclosed which incorporates, in the preferred and illustrated embodiment, a separable keyboard with hammer mechanism attached which slidably removes from the body of the piano. The remainder of the piano apparatus is incorporated with the body. This is an aid to reduction of weight and division of the piano into two more readily manageable packages for quick moves. The apparatus incorporates a slide assembly aligning the keyboard, a clamp to latch the hammers in a fixed position when detached from the body and a latch release mechanism. There is, additionally, means for bolting the piano keyboard to the body.

Abstract: A keyboard musical instrument such as a piano of relatively large size and heavy construction can be separated into two casings, each of which fully contains respective coacting elements of the instrument, for easy and free transportation, storage and access from outside.