JPS58213387A - Weight detecting mechanism of weight detecting type coordinate input device - Google Patents

Abstract

PURPOSE:To loosen severe requirements to processing and assembling accuracy and to decrease the variance of products, by providing a recess only one side of a surface plate of a supporting point and making the other side flat for point contact. CONSTITUTION:A recess is provided for only one side of prescribed positions (at least, two positions) of the surface plate, and the other side is made flat, and the plate is clipped with acuminations of pivots 10 provided for channel-shaped arms 8, 9 of a coupling body. Further, the coupling body is fitted to one end of a plate spring, and the other end of the plate spring is fixed to a support. In the constitution above, the effect of friction is halved for the force transmitting section between the surface plate 1 and the plate spring in comparison with the surface contact. Further, the requirement of eccentricity needed for the provision of recess for both front and back sides is not taken into account, and the severe requirements of the processing accuracy is loosened.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention The present invention relates to a structure of a force transmitting section in a weight sensing type coordinate human power device.

A conventional weight detection type coordinate input device supports a face plate made of a rigid body such as glass at eight points, for example, and when LA on this face plate is pressed with a finger, the force application point is determined from the component force generated at each support point. It detects the coordinates of

Hereinafter, this coordinate human-powered device will be abbreviated as a touch panel.

FIG. 1 is a diagram illustrating the operating principle of a touch panel.

In Fig. 1, 2 denotes a face plate made of a rigid body such as a glass plate, and when a vertical force F acts on it, force detectors 2a, 2Jb, 2C1 are installed at eight locations below the face plate 1.
Second, a force corresponding to each moment is applied. Here, the in-plane coordinates of the face plates 1 of the force detectors 2at 2b and 2C are A(Xa, Ya) and B(X,).

yb), c (xc, y,), and the forces applied perpendicularly to the face plate l to each point A, B, and C by the force F applied to point P on the drawing board are fa, fb, and fo, then P
The coordinates (X, Y) of the point can be determined by the following equation.

The above is the principle of the touch panel, but in this case, A,
At each point B, C, regardless of the attitude of the face plate 1 and the angle of application of the force F to it, the component force fa perpendicular to the face plate l,
It is necessary to detect only f,, fc.

Furthermore, at each point A, B, and C, when the force F is applied to the face plate 1, each force detector (2a, 2b) measures the vertical component force corresponding to each moment without influencing each other.

2c) must have a structure that transmits it to Fi.

FIG. 2 shows the specific structure of the touch panel, with FIG. 2(a) being a plan view and FIG. 2(b) being a sectional view.

In FIG. 2, reference numeral 8 denotes a plate spring to which a strain gauge is attached. This plate spring 3 is used as a force detector, and the face plate 1 and the support method 4 are connected at three locations. Reference numeral 8a indicates a connecting portion of the leaf spring 8 on the support side, and 8b indicates a connecting portion on the drawing board side.

In the structure of the touch panel as shown in Fig. 2, even if a force is applied to the face plate l and the leaf spring 3 is bent, in order to detect only the vertical force corresponding to each moment as the differential output of the strain gauge, it is necessary to No matter which leaf spring is used, it is necessary that the face plate 1 and the leaf spring 8 be connected at one point and movable around the connecting point. In order to realize this structure, as shown in FIG. 8 or FIG. The U-shaped arms 8 and 9 of the coupling body 7 are sandwiched between pivots 1o having conical, pyramidal, etc. tips.

However, in the structure shown in Figure 8, it is difficult to make the apex of the conical or pyramidal pivot point 0 into a perfect point shape. The structure includes pivots 10 of the arms 8 and 9 and a slotted depression provided in the drawing board 1.

Since the contact with 6 is a surface contact of a certain size, it is not necessary to make the tip of the pivot 10 into a perfect point shape. It is experimentally clear that the frictional force increases in proportion to the center deviation of the depressions 5 and 6 and the pinching force of the bipot eye O sandwiched through the depressions 5 and 6, making it impossible to detect the correct vertical force. It became. For this reason, in order to obtain practical coordinate accuracy, it is necessary to increase processing accuracy and assembly tI, which often results in higher costs and the disadvantage that it is difficult to keep product variations small.

OBJECTS OF THE INVENTION An object of the present invention is to alleviate the strict requirements for processing accuracy and assembly accuracy, which are the problems of the above-mentioned conventional technology, and to minimize product variations in the structure of a force transmitting part that is applied to a touch panel. It's about making it possible.

The problem with the prior art is that the support points for transmitting force of the touch panel have a structure in which depressions are provided on both the front and back surfaces of the face plate. Therefore, in the present invention, a recess is provided only on one side of the face plate of the support point, and the other side is made flat for point contact, thereby reducing coordinate detection errors and performing weighted detection at low cost and easily. This is how it was done.

Embodiments of the Invention FIGS. 5 and 6 are embodiments of the present invention, and both show the structure of a joint between a face plate and a leaf spring in a touch panel. Figure 5 shows a structure that can be applied to at least two of the three support points that support the face plate 1, and Figure 6 shows a structure that can be applied to other than the two support points with the structure shown in Figure 5. be.

As shown in Fig. 5, there are bee-shaped depressions 5 on one side at predetermined locations (at least 2 locations) on the surface &l. The other side is flat, and the tip of the pivot 10 in the shape of a gong, pyramid, etc. is set on the U-shaped arms 8, 9 of the joint body 7 as shown in Fig. 8. . Furthermore, as shown in Figure 3,
The coupling body 7 is attached to one end of the leaf spring 8, and the other end of the leaf spring 8 is attached to the support 4 (two fixed parts). 8) is sandwiched between the tips of conical pivots 10 provided on the U-shaped arms 8 and 9 of the joint body 7 shown in FIG. 8, with both surfaces flat.

The force transmission portion between the face plate 1 and the leaf spring 8 shown in FIGS. 5 and 6 is in point contact on at least one side, and the influence of frictional force is halved compared to the conventional surface contact shown in FIG. 4. It is clear that it will be less than that. Furthermore, since the concave groove 5 is provided only on one side, there is no need to consider the center deviation required when creating the lotus grooves 5 and 6 on the front and back sides of Fig. 8. It is sufficiently possible to reduce the roughness of the part with normal processing techniques, and it is good to specially finish only the depression 5 on one side (= 1L), but the severe processing accuracy required in the case of Fig. 3 is It can be reduced to A.

Furthermore, if the two supporting points of the face plate 1 are supported by the packing shown in Figure 5, and the eighth supporting point is made of the B structure shown in Figure 6, the frictional force and machining accuracy described above may be small, and the face plate l and pivot 1
There is no problem even if there is a gap between S? In order to control the pinching force by a pivot of 1° at t, it is only necessary to pay attention to the structure shown in FIG. 5, and the difficulty is reduced to %.

Effects of the Invention As is clear from the above description, the present invention provides the following effects.

(11) Conventional force transmission contacts in which surface contact was used were greatly affected by frictional force, but by making point contact on one side, the degree of influence was halved or less, and coordinate detection Accuracy can be increased.

(21 (11) By making the depressions only on one side, the center shift of the front and back sides, which was required in order to reduce the frictional force of 11, and the severe processing required to reduce the surface roughness of the gravure, There is no need to think about center deviation, and 8 on one side
Only special machining accuracy can be achieved completely, and the severity can be reduced to %.

One of the C328 support points does not have a recess, and it is possible to create a gap between the pivot and the face plate at that point, which reduces the pinching force caused by the pivot that affects the frictional force. Con) U-ru only needs the remaining two fulcrums, and the difficulty in assembling beans is reduced by 30%.

(4) Due to the effects 2 to 3 above, it is possible to reduce the cost.

[Brief explanation of the drawing]

Figure 1 is a diagram explaining the entire principle of the touch panel, Figure 2 (a
) is a plan view showing an example of the construction of a Karo heavy inspection 1115 machine barrel with a touch panel, Figure 2 (1)) is a cross-sectional view of the same, Figures 8 and 4
! The figure shows the conventional arrangement of the adhesive part between the face plate and the leaf spring, and the handle 5 and x6 show the uninvented arrangement 7. ■... Face plate, 2a, 20. ``lc... Force generator, 8... Leaf spring, 4... Support body, 5, 6... Clamp, 7... Connector, 8.9... Arm, lO. ··pivot.

Claims (3)

[Claims] (1) At least eight locations on the face plate are supported using leaf springs each equipped with a force detector, one end of which is fixed to the support, and the other end is U-shaped, with the pointed end facing inwards. In the load detection mechanism of the load detection type coordinate human power device, the load detection mechanism is provided with a pair of pivots facing toward the surface plate, and the pivots support the face plate so as to sandwich it from both sides, at least two of the support points of the face plate. is one side of the face plate (=
A weight detection mechanism characterized by having a structure in which a recess is provided and the tip of the pivot is brought into contact with the recess. (2) The load detection mechanism according to claim 1, wherein the support points of the face plate other than the two support points are flat on both sides of the face plate. (3) The pivot has a taper toward the tip, and the tip thereof has a minute spherical shape, and the spherical portion is in contact with a recessed portion or a flat portion of the face plate. The weighted detection mechanism according to the first or second term of the range.