JPS58131530A - Calibrating method for stylus pressure measuring device - Google Patents

Abstract

PURPOSE:To improve the measuring accuracy of the titled device without changing the attachment of a detecting lever at the calibration of side pressure by converting a vertical load into a horizontal load and applying the converted load to a horizontal measurement plate. CONSTITUTION:A balance 20 having a vertical arm 21b and a horizontal arm 21a which are intersected at right angles is previously balanced and a contact element 26 attached to the vertical arm 21b is contacted to the horizontal measurement plate 11 of a stylus pressure measuring device. After applying a known vertical load to the horizontal arm 21, the balance 20 is moved in the direction of the plate 11 until balanced again and the vertical load is converted into a horizontal load to apply the converted load to the plate 11. The displacement of the plate 11 is measured by a non-contact displacement meter 14 to obtain the I/O characteristics for pressure force and an output from the displacement meter 14. Consequently the stylus pressure measuring device can be precisely calibrated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for calibrating a stylus force measuring device for a playback stylus for a video disc player.

FIG. 1 shows how the vertical pressure and lateral pressure of a playback needle attached to a video disk cartridge are measured. As shown in Fig. 2 (α) and (b), the above vertical pressure and lateral pressure are determined by the rivet 1
Keeping the distance from to the disk surface 2 at a certain constant @1,
In addition, when the tip of the stylus 4 is fully positioned at the center of the cartridge case 5, there is a vertical force (vertical pressure) that acts on the tip of the stylus 4 and a horizontal force (lateral pressure) that acts in a direction perpendicular to the cartridge case 3.Therefore, the vertical force and Lateral pressure must be measured at the same time.

The conventional measurement method is as shown in Fig. 1.
A block 8 is fixed to the tip of the plate spring 5, and a lever 9 is attached to the tip of the block 8.
．． Detection lever 1 consists of a structure in which a flat plate 11 with a stylus holder of 1° is fixed so as to serve as a screen! is fixed to the fixed block 13 with the plate spring 6 to form a cantilever beam, and the reproducing needle 4 of the video disc cartridge is placed on the stylus receiver 1o of /<-12, and the reproducing needle 4 is generated from the reproducing needle 4. The force is applied to two leaf springs 5.6 degrees vertically.

It is decomposed into horizontal components and the detection lever is displaced in the vertical and horizontal directions. This displacement position is measured using a non-contact displacement meter 14.15.
Measuring the pressure and converting it to the side pressure and lateral pressure.

In addition, the V @ adjustment of vertical pressure and lateral pressure is determined by the vertical and horizontal displacement lid of the detection lever 13 to determine whether the predetermined Tarusanno and lateral pressure are generated at a constant distance of 1 t from the rivet 1 to the regenerated needle receiver 1o. is detected by the non-contact displacement meter 14.15, the adjustment lever 16 is moved to 2. Move in the y direction, rotate the shipole 17, and deform the fly lead 18 to achieve the predetermined vertical and lateral pressure! ! Perform the adjustment.

As mentioned above, in order to perform the vertical pressure and lateral pressure detection FA adjustment, it is necessary to detect the vertical pressure and lateral pressure applied to the regenerated needle receiver 1o, and to detect each non-contact when the verso is displaced. It is necessary to know the relationship between the output of the displacement meter 14 and 15.

Conventionally, the vertical pressure (vertical direction) is calibrated by applying a known vertical load FV1 to the stylus holder 1o, as shown in FIG. 6, and the leaf spring 5 assembled in the water XF- is deformed. The relationship between the vertical load WI and the human output of the non-contact displacement meter 15 is calibrated by reading the displacement of the block 8 as the output of the non-contact displacement meter 15 at that time.

However, in the case of horizontal pressure, it is not possible to apply a minute load (on the order of a cape) horizontally directly to the regenerated needle guard 1°. Remove the plate spring 6 for lateral pressure detection from 16, rotate it 90', and set it again so that the plate spring 6 deforms under the ml load.

In this state, a minute load Wl is applied in the vertical direction to the flat plate 11 provided with the regenerated needle receiver 10, and the displacement lid of the flat plate 11 is measured with the non-contact displacement meter 14. I was conducting calibration related to 14 human outputs.

The above method was used to calibrate vertical pressure, lateral pressure, and the output of the non-contact displacement meter, but in the case of Taruyamano, the condition at the time of calibration and the condition during actual use were the same, so the problem was solved. Does not occur.

However, in the case of lateral pressure calibration, there are the following drawbacks.

(1) The conditions during actual use and during calibration are different.

(2) After calibration, the length of the spring 6 is deformed and an error occurs because the bar is removed and returned to its original state. Side pressure 2
■When the length of the binding leaf spring 6 is 12 mm, the measurement accuracy is 10.
%, the installation error must be 15 μm or less.

(3) With the current calibration method, detection lever 1! The self-weight of the plate spring 6 is applied to the plate spring 6, causing a deflection, which causes the flat plate 11 and the non-contact displacement meter 14 to bend in the horizontal and vertical positions even with the same lateral pressure load.
The difference in angle between the two causes a difference in the output of the non-contact displacement meter 14.

One object of the present invention is to eliminate the drawbacks of the prior art described above, and to perform calibration by applying a small horizontal load in the same state as in actual use, without changing the attachment of the detection lever when calibrating the pressure. Another object of the present invention is to provide a method for calibrating a stylus pressure measuring device that improves measurement accuracy.

In order to achieve the above object, the present invention provides a balance having a vertical arm and a horizontal arm that are in contact with each other. The balance is kept in contact with a flat plate for measurement, and then, after applying a known vertical load to the horizontal arm, the balance is moved in the direction of the flat plate until the balance is in equilibrium, and the vertical By converting the load into a horizontal load and applying pressure to the front 0-pi flat plate, it is possible to know the exact pressing force on the flat plate, so the displacement of the flat plate at this time can be measured using a non-contact displacement meter. When measuring, it is possible to know the input/output characteristics of the pressurizing force, which is the human power, and the output on the displacement side, which is the output, and it is possible to accurately calibrate the stylus pressure measuring device.

Embodiments of the present invention will be specifically described below with reference to the drawings.

FIG. 5 is a front view showing the overall structure of one embodiment of the balance used in the present invention. Figure 6 is a perspective view showing the condition of the arm of the balance when the weight is placed on the pan and the contact is brought into contact with the flat plate at the tip of the detection lever. An explanatory diagram showing a calibration method for calibrating the output and lateral pressure of a non-contact displacement meter by placing the contact on a plate and touching the flat plate at the tip of the detection lever to generate horizontal force (9111 pressure) against the flat plate. . FIG. 8 is an enlarged view showing the shape of the tip of the contact.

In FIG. 5, the balance includes an L-shaped arm 21, a knife 23 fixed to the L-shaped arm 21, and a knife 23 fixed to the L-shaped arm 21.
, 3, an indicator needle 27 fixed to the L-shaped arm 21, and a scale plate 2 attached to the main body 32.
The plate 25 and the vertical arm 21A of the L-shaped arm 21 are fixed to the detection lever. 1!
The contact member 26 applies a horizontal force as lateral pressure to the contact member 26.

Moreover, this human balance is constructed so that the entire balance υ can be moved parallel to the horizontal arm 21α by moving the horizontal fine movement device 29 by turning the dial gauge 30.

The L-shaped arm 21 has the knife 23 as its fulcrum and the weight holder is the distance from the fulcrum of the knife 23 to the plate 25 *4 and the distance # to the contact in an unloaded state where no weight is placed on the pan 25. t, 1. = 1°, horizontal arm 21
Balanced so that α is horizontal. Indicator hand 27 at this time
The position of the tip is marked on the scale plate 28, for example, by a notch line or the like.

Next, a method for calibrating lateral pressure using this balance will be explained. The balance 29 set on the horizontal fine movement device 29 is set at a position opposite to the detection lever 1 of the stylus pressure measuring device. With the balance in an unloaded state, the dial gauge 30 is turned to move the horizontal fine movement device 29 horizontally, and the entire balance is brought close to the detection lever.

The contactor 26 and the large plate 11 of the detection lever 1 are brought into contact and the horizontal movement is once stopped. In this state, the tip of the indicator needle 27 is aligned with the mark indicating the no-load state on the scale plate 28, and the side pressure is zero when viewed from the detection lever 1.

Next, when the weight receiver places a predetermined weight of weight 31 on the pan 25, the balance in the no-load state is disrupted and the tip of the indicator needle 27 deviates from the mark indicating the no-load state, as shown in FIG.

In this state, the weight holder receives a force P1 of 1111 from the weight 31 in the direction in which the plate 25 hangs, and a horizontal force P2 acts on the flat plate 11 via the contact 26, causing the plate spring 6 to move in the horizontal direction. Since the flat plate 11 is deformed and a horizontal reaction force is generated on the flat plate 11, the L-shaped arm 21 is balanced in an oblique state.

The view in the direction of arrow A in FIG. 6 is shown by the solid line in FIG.

Next, with the weight 31 still placed on the plate 25, turn the dial gauge 30 from the state shown by the solid line of the 7th factor, and move the balance 20 in the direction of the flat plate 11 with the detection value <-1Q.
17 left direction) K forward.

Since the flat plate 11 is pushed by the contact 26 by moving it forward, the plate spring 6 of the detection lever 1 is further deformed in the horizontal direction, and at the same time, the reaction force from the flat plate 11 to the contact 26 is increased. As the reaction force from the flat plate 11 increases, the balance 20
The L-shaped arm 21 gradually shifts from the tilted state shown by the solid line in FIG. 7 to the equilibrium state, and the horizontal arm 21α approaches the horizontal state.

The horizontal fine adjustment device 29 is further advanced until the pointer 27 matches the no-load state indication mark on the scale plate 28.
Move 0.

This state is shown by the dashed line in FIG. In this state, the horizontal arm 21'a is horizontal, the tip of the indicator needle 27' is aligned with the no-load state indicator mark on the horizontally moved scale plate 28'', and the balance state is in the no-load state. The weight holder is detected by the force generated by the weight 31' on the pan 25' and the horizontal force generated by the contact 26' due to the horizontal movement of the balance 20'. This is because the plate spring 6 of the lever 1'' is displaced and the reaction force generated from the flat plate 11' against the contact 26' is the same. Therefore 1. =1! The line is weight 5
The horizontal force equal to the vertical force due to 1′, that is, the pressure
It becomes the san that worked in 1'.

By performing the above operation, @ in the no-load state shown in Figure 5
Due to the flat plate 11 of the comparison bar 1 and the gear groove of the non-contact displacement meter 14, the value output by the non-contact displacement meter 14 is 7'z different from the output when the side pressure is zero. In addition, when the gap between the flat plate 11' and the non-contact displacement meter 14 when a weight 31' of a certain weight is placed on the state shown by the dashed line in FIG. 7, the non-contact displacement meter 14
The output area is the output when the side pressure is equal to the force exerted by the weight 31'.

By calibrating the non-contact displacement meter in this way, it can be calibrated in the same conditions as when measuring the lateral pressure of a video disc cartridge, and the detection lever, which was a drawback of the conventional method, can be replaced with a 90° one. The difference in vibration that occurs during calibration can be completely eliminated, allowing accurate lateral pressure measurement.

Furthermore, as shown in figure wJ8, the contact 26 is conical,
The tip should be in cool autumn. If so, when the L-shaped arm 21 shown in FIG.
The tip curves the side surface of the flat plate 11 in the vertical direction. Therefore, the frictional resistance generated therein can be reduced, and the L-shaped rod 21 can be smoothly rotated around the fulcrum of the knife blade 23.

Furthermore, by changing the ratio of the distance t from the fulcrum of the knife 26 to the plate 25 and the distance t1 from the contact 26, it is possible to increase or decrease the width of the horizontal force with respect to the υ vertical force.

Further, in order to minimize the vertical movement of the contact which occurs due to the rotation of the arm, it can be minimized by placing the tip of the contact on a line perpendicular to the fulcrum of the knife. The structure of the yoke (Figure 9) is a modification of the L-shaped arm, and the vertical i of the fulcrum of the knife 32! The tip of the Kwk feeler 33 is placed on the line.

See you again! FIG. 10 shows a combination of a horizontal arm 34 and a vertical arm 35 in a single character shape.

As explained above, by performing the calibration method according to the present invention, it is possible to eliminate nine calibration errors that conventionally occur when the extraction bar is removed and rotated 90 degrees for calibration. Since it is possible to perform calibration under the same conditions as in actual use, highly accurate calibration can be performed.

Moreover, as a result, the reliability of lateral pressure measurement can be improved, and the yield of products can be improved.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing how stylus pressure is measured. Figure 2 (aJ is a front view showing the relationship between the videotiff cartridge and the disc surface, Figure 2(b) is a side view showing the relationship between the videotiff cartridge and the disc surface, and Figure 3 is the vertical view of the conventional needle. Perspective view showing the pressure calibration method, No. 4
The figure is a perspective view showing a conventional method for calibrating the lateral pressure of a needle, FIG. 5 is a front view showing the overall structure of an embodiment of the balance used in the present invention, and FIG. , Figure 7 is l! A view in the direction of arrow A in Fig. 6, Fig. 8 is an enlarged view showing the tip of the contact, I! FIG. 9 is a diagram showing another arm structure of the balance used in the present invention, and FIG. 10 is a diagram showing still another arm structure of the balance used in the present invention. 21.6.21b'', 55... Vertical arm 21α, 21α
', 34... Horizontal arm 20.20'... Balance 26, 26', 33... Contactor 11.11'... Flat plate Figure 1 (a) (b) Broom 3 Figure 5 Haze尰躬7 fig. 8 flash

Claims (1)

[Claims] A balance having a vertical arm and a horizontal arm that are mutually KIN is brought into contact with the contact provided on the vertical arm and the flat plate for horizontal direction measurement of the stylus pressure measuring device in a flat state, and then After applying a vertical load to the arm, the balance is moved in the same direction as the plate to bring the balance into an equilibrium state, converting the vertical charge into a horizontal load and applying pressure to the plate. How to calibrate a stylus pressure measuring device.