JP2587744Y2 - Electronic musical instrument keyboard device - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument such as an electronic piano.

[0002]

BACKGROUND OF THE INVENTION Conventional electronic musical instrument keyboard apparatus, for example, as shown in FIG. 4, the upper surface of the keyboard frame a, white keys b ₁ and black keys b ₂ is rotatably held, and on its lower surface The wiring board c is attached. A plurality of keyboard switches d are provided on the wiring board c, and these are arranged to face the actuators e of the white keys b ₁ and the black keys b ₂ through holes of the keyboard frame a. White key b ₁ and black keys b ₂ is, L-shaped stopper f protruding from the lower surface thereof is guided by the key guide g which is secured to the keyboard frame a respective swing in the lateral direction is restricted.

[0003]

[Devised is to solve the above conventional keyboard apparatus described above, regulation of the swing in the lateral direction of the white key b ₁ and black keys b ₂ is performed by the key guides g attached to the keyboard frame a, whereas Since the position of the keyboard switch d is determined by the wiring board c attached to the keyboard frame a, the mounting accuracy of the key guide g to the keyboard frame a and the attachment of the wiring board c provided with the keyboard switch d to the keyboard frame a the degree of accuracy, a problem that the relative relationship between the lateral position of the white key b ₁ and black keys b ₂ of the keyboard switch d is changed, the operation of the keyboard switch d becomes unstable by pressing the key there were.

An object of the present invention is to solve such a problem of a conventional keyboard device.

[0005]

This invention SUMMARY OF THE INVENTION In order to achieve the above object, in a keyboard apparatus of an electronic musical instrument comprising a printed circuit board keyboard switch actuated by depression of keys are mounted, said printed circuit board, It is characterized by including a key guide portion for restricting the key from swinging in the lateral direction.

[0006]

[Function] A key guide part for restricting the key from swinging in the lateral direction is provided.
Since the key switch is directly provided on the printed circuit board, the relative relationship between the horizontal position of the key and the position of the key switch is more stable than in the conventional case, and the key switch operates stably when the key is pressed.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention.

[0009] In the figure, 1 ₁ and 1 ₂ are white keys and black keys, 2 for the printed circuit board as the wiring board, 3 a keyboard switch. A plurality of white key 1 ₁ and a plurality of black key 1 _2,
Common through a respective hinge portion 4 ₁ and 4 ₂ mounting portion 5 ₁ and 5 ₂
The common mounting portions 5 ₁ and 5 ₂ are stacked via a holding member 6 and mounted on the printed circuit board 2 with screws 7 so as to be rotatably held on the printed circuit board 2. Is done. This printed circuit board 2 includes a keyboard switch 3 actuated by depression of the actuator 8 each provided on the white keys 1 ₁ and black keys 1 _2, upper limit stopper felt 9 and the lower limit stopper felt 10 is disposed, also,
A key guide 12 made of an elastic cap made of rubber or the like is fitted to the projection 11 corresponding to the keyboard switch 3 at the edge. It said key guide 12, the white key 1 ₁ and the cross section of each of the downward projecting portion of the black key 1 ₂ is fitted to the inner wall of the substantially U-shaped groove 14. Reference numeral 13 denotes a stopper formed on one of the side walls of the lower protruding portion. The stopper 13 contacts the upper limit stopper felt 9 when the key is released. The keyboard switch 3 includes a fixed contact (not shown) disposed on a printed circuit board surface and an inverted bowl-shaped member 1 made of rubber or the like having a movable contact fixed therein.
The movable contact and the fixed contact are closed when the member is deformed by pressing the actuator 8. In this embodiment, the members 15 of the plurality of keyboard switches 3 are integrally formed. The printed circuit board 2 is attached to a shelf plate or the like of a musical instrument body (not shown).

FIG. 3 shows another embodiment of the present invention.

[0011] In this embodiment, the common mounting portion 5 ₁ and 5 ₂ of the white key 1 ₁ and black keys 1 _2, superimposed over the holding member 6, the keyboard frame 16 by attaching the keyboard frame 16 by screws 7 It is rotatably held above. Printed circuit board 2
The keyboard switch 3 and the lower limit stopper felt 10 are disposed, and the projection 11 corresponding to the keyboard switch 3 at the edge thereof has a key guide made of an elastic cap such as rubber as in the above-described embodiment. 12 are fitted. The printed board 2 is attached to the keyboard frame 16. The upper limit stopper felt 9 is fixed to the lower surface of the keyboard frame 16.

According to this embodiment, the white key ₁₁ and the black key 1 ₂
Is rotatably held by the keyboard frame 16,
Its lateral position is restricted by the key guides 12 provided on the printed circuit board 2, since relatively close to the key guides 12 and the keyboard switch 3, the white key 1 ₁ and black keys 1 ₂ of the keyboard frame 16 The relative relationship between the horizontal position of the key and the position of the keyboard switch is stable without being affected by the assembling accuracy of the key.

In the above embodiments, a mechanical switch is used as a keyboard switch. However, a non-contact switch such as a photoelectric switch including a light source and a light receiving element can be used. The photoelectric switch is actuated by an actuator consisting of a reflector provided on the back of the key. That is, when the key is pressed, the light reflected by the reflector enters the light receiving element, and the light receiving element outputs a key pressing signal.

[0014]

[Effect of the invention The present invention is, Puri key guides for regulating the swing in the lateral direction of the key as described above is provided a key switch
Since it is provided directly on cement board, relative relationship between the position of the lateral position and keyboard switch key is stabilized as compared with the conventional key switch when the key pressing has the effect of stable operation.

[Brief description of the drawings]

FIG. 1 is a side view of an embodiment of the present invention.

FIG. 2 is a plan view of the printed circuit board according to the embodiment.

FIG. 3 is a side view of another embodiment of the present invention.

FIG. 4 is a side view of a conventional keyboard device of an electronic musical instrument.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ₁ and 1 ₂ White key and black key 2 Printed circuit board 3 Keyboard switch 8 Antuator 12 Key guide 13 Stopper 14 Groove 16 Keyboard frame

Claims (1)

(57) [Scope of request for utility model registration] 1. A keyboard apparatus of an electronic musical instrument comprising a printed circuit board keyboard switch is mounted actuated by depression of a key, the printed circuit board is provided with a key guide portion for regulating the swing in the lateral direction of the key A keyboard device for an electronic musical instrument.