CN2537093Y

CN2537093Y - Composite wooden sound board with oblique malce-up core

Info

Publication number: CN2537093Y
Application number: CN 02222223
Authority: CN
Inventors: 张华君
Original assignee: Individual
Current assignee: Individual
Priority date: 2002-04-15
Filing date: 2002-04-15
Publication date: 2003-02-19
Anticipated expiration: 2012-04-15

Abstract

The utility model relates to an oblique core-splicing solid wood compound sound board, belonging to the technical field of piano sound board manufacture; wherein the rectangular core board is spliced obliquely with a quarter-sawed spruce lumber or a quarter-sawed fir lumber, or is spliced obliquely with a paulownia lumber or a basswood lumber that does not distinguish quarter-saw and plain-saw based on the long side of the sound board and the texture trend of the material. The inclination between the median board of the core board and the long side of the sound board is 38 to 65 degrees; the upper surface board and the lower surface board of the sound board is fixedly connected with the upper surface and the lower surface of the core board respectively via glue; the upper surface board and the lower surface board adopt the quarter-sawed spruce single lumbers to splice together with a certain inclination with the long side of the sound board, wherein the quarter-sawed spruce single lumber differs by five to twenty degrees from the inclination of the median board of the core board. The utility model has the advantages of better acoustic characteristic and good weather proof performance.

Description

The oblique malce-up core composite wooden sound board

Technical field

The utility model relates to wooden component of musical instrument, and particularly piano soundboard is made the field.

Background technology

Piano allow (comprising soundboard Sound Board, stall bars Rib, string sign indicating number Bridge, frame) accepts to strengthen from the vibration of string the resoance radiation of sound.According to the function of soundboard, it should meet following requirement; 1, the speed of conduction sound decays little soon.2,, has uniform sympathetic response to the sound of different vibration frequencies.From theory, desirable soundboard is a very big dome-shaped diaphragm of radius.Since the complicacy of soundboard vibration, the singularity of allow structure and anisotropy of material, the theory of centuries is sought, and fails to form an absolute authority's final conclusion, and designing and producing of piano soundboard still needs the dependence experience to finish to a certain extent.The traditional fabrication of piano soundboard is to adopt Pinaceae Picea plank of solid wood oblique (soundboard is a rectangle, is called during for acute angle oblique with the angle on the long limit of soundboard) splicing, forms through fixed thick sanding again.This way has following problem: one, select materials that it is harsh to require, and any natural defect can not be arranged, and grain of wood aberration etc. is all had strict restriction; Its two, solid wood soundboard weatherability is poor.The variation of soundboard timber with geographic location, the sudden change of environment temperature and can deforming, even cracking cause whole piano not use.The weatherability difference is the critical defect of traditional solid wood soundboard; Its three, traditional solid wood soundboard is made the waste timber resources, its cost is higher.

The utility model content

Task of the present utility model is that it has good acoustic quality characteristic and good weatherability for a kind of oblique malce-up core composite wooden sound board.Above-mentioned task is realized by following design: a kind of oblique malce-up core composite wooden sound board, comprise the rectangle central layer that is spliced by oblique mode by the timber lath, it is characterized in that, paulownia that described central layer is regardless of by quarter sawing dragon spruce or quarter sawing fir lath or footpath flat-cut or linden lath are oblique mode according to its texture trend with the long limit of soundboard and are spliced, and the inclination angle on central layer middle plate strip and soundboard length limit is between the 38-65 degree; Also comprise upper and lower dash board: connect firmly with the upper and lower surface of central layer gummed respectively; By keeping certain inclination angle to be spliced with the long limit of soundboard, the inclination angle of this inclination angle and central layer middle plate strip differs the 5-20 degree to this upper and lower dash board by quarter sawing dragon spruce veneer.According to above-mentioned design, constitute three layers of practical Complex soundboard that is the joiner structure by central layer and upper and lower dash board, wherein, central layer is by the oblique splicing of a plurality of laths; It also is oblique splicing that upper and lower dash board all adopts quarter sawing dragon spruce veneer, and the inclination angle of its inclination angle and central layer middle plate strip differs certain angle.Compare with traditional solid wood soundboard, mainly have following characteristics and advantage: 1, it has good weather resistance.The Complex soundboard that is formed by three layers of crosswise lamination is to climate change, and the ability to bear that temperature humidity changes increases significantly, and has solved the distortion and the cracking problem of soundboard preferably.2, because it is last, the inclination angle of the inclination angle of veneer and central layer middle plate strip is incomplete same in the following dash board, certain difference is arranged, this architectural feature, improved whole soundboard along timber across grain vibration propagation speed and efficient, make soundboard each to homogeneous more, (the transaudient speed difference of timber band and rift grain is very big more to be tending towards desirable vibrating diaphragm, the transaudient speed of its rift grain is far longer than the transaudient speed of band, as the transaudient speed of the rift grain of fish scale dragon spruce is 5298m/s, and the transaudient speed of band 783m/s only, and soundboard need satisfy when accepting the string vibration, and all directions of soundboard are all vibrated the job requirement of getting up; This functional requirement is by stall bars conduction, central layer lath tongue and groove splicing raising conduction efficiency of laterally putting up a bridge, add the gross area cross lamination gummed of Face veneer, the final adjustment realizes that each is to equal neat coefficients, make soundboard become more uniform vibrating diaphragm, improved anisotropy of material), thereby this novel acoustic quality that improves soundboard.3, this novel satisfied traditional soundboard structure function can enter high-grade piano field fully.4, central layer is no longer overcritical aspect color and luster, annual ring, tiny defect, makes more economical rationality of selection; Reduced the soundboard cost of manufacture.

Description of drawings

Fig. 1 is this novel front view (cut-away section);

Fig. 2 Fig. 3 Fig. 4 is respectively the left view of pairing three embodiment of Fig. 1;

Fig. 5 Fig. 6 Fig. 7 Fig. 8 is the sectional drawing that mills four kinds of forms of tenon tongue and groove splicing between the lath of central layer shown in Figure 1.

Embodiment

Fig. 1 illustrates, paulownia that rectangle central layer 2 employing quarter sawing dragon spruces or quarter sawing fir lath or footpath flat-cut are regardless of or linden lath are oblique mode according to the long limit of its texture trend (moving towards consistent by texture between lath arranges) and soundboard and are spliced, the inclination angle (acute angle that the two is folded) on the long limit of central layer middle plate strip and soundboard is preferably between the 50-55 degree between the 38-65 degree; Upper and lower dash board 1,3 connects firmly with central layer 2 upper and lower surface gummeds respectively, upper and lower dash board all adopts quarter sawing dragon spruce veneer by keeping certain inclination angle to be spliced with the long limit of soundboard, the inclination angle of this inclination angle and central layer middle plate strip differs the 5-20 degree, better differs the 8-15 degree, preferably differs the 10-15 degree.The thickness of upper and lower dash board is preferably identical.Central layer can adopt uniform thickness (Fig. 2) or uniform thickness (Fig. 3 Fig. 4) not, and central layer is during uniform thickness, its vertically (along soundboard rectangle Width) section shape be isosceles trapezoid or right-angled trapezium.The central layer middle plate strip forms with raked joint plane or the tenon tongue and groove piece mode of the milling transverse bonding shown in Fig. 5-8 each other.The long 1440-1600mm of whole soundboard, wide 920-1100mm, central layer thickness are 5.0-8.5mm, preferably 6.0-6.5mm; The thickness of upper and lower dash board is 0.5-2.0mm, is preferably 0.8-1.2mm.

Claims

1, a kind of oblique malce-up core composite wooden sound board, comprise the rectangle central layer that is spliced by oblique mode by the timber lath, it is characterized in that, paulownia that described central layer (2) is regardless of by quarter sawing dragon spruce or quarter sawing fir lath or footpath flat-cut or linden lath are oblique mode according to its texture trend with the long limit of soundboard and are spliced, and the inclination angle on central layer middle plate strip and soundboard length limit is between the 38-65 degree; Also comprise upper and lower dash board (1,3): connect firmly with the upper and lower surface of central layer (2) gummed respectively; By keeping certain inclination angle to be spliced with the long limit of soundboard, the inclination angle of this inclination angle and central layer middle plate strip differs the 5-20 degree to this upper and lower dash board (1,3) by quarter sawing dragon spruce veneer.

2, oblique malce-up core composite wooden sound board as claimed in claim 1 is characterized in that, the inclination angle of veneer and the inclination angle of central layer middle plate strip differ the 8-15 degree in the described upper and lower dash board (1,3).

3, Complex soundboard as claimed in claim 2 is characterized in that, described central layer (2) middle plate strip is each other with the raked joint plane or mill bonding the forming of tenon tongue and groove piece mode; The inclination angle of veneer and the inclination angle of central layer middle plate strip differ the 10-15 degree in the described upper and lower dash board (1,3).

4, Complex soundboard as claimed in claim 3 is characterized in that, the thickness of described upper and lower dash board (1,3) is identical; The thickness of upper and lower dash board is 0.5-2.0mm; The thickness of described central layer is 5.0-8.5mm.

As claim 1 or 2 or 3 or 4 described Complex soundboards, it is characterized in that 5, described central layer is uniform thickness or uniform thickness not; During uniform thickness, its longitudinal profile is not shaped as isosceles trapezoid or right-angled trapezium to this central layer.

6, Complex soundboard as claimed in claim 5 is characterized in that, the inclination angle of described central layer middle plate strip is the 50-55 degree.The thickness of central layer is 6.0-6.5mm; The thickness of described upper and lower dash board is 0.8-1.2mm; The long 1440-1660mm of whole soundboard, wide 920-1100mm.