JPS5823644B2 - Pitsukuatsupuyo Cantilever - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in the physical properties and material aspects of pickup cantilevers used for record reproduction, and in particular enjoys extremely high relative stiffness E/ρ (Young's modulus E, density ρ). By providing a pickup cantilever in which the crystal direction of the material matches the axial direction of the cantilever, we can improve the fundamental characteristics such as frequency characteristics, transient characteristics, crosstalk characteristics, and mechanical impedance of the pickup cartridge that uses the cantilever as a component. The aim is to significantly improve various characteristics.

In general, the conditions required for cantilever materials are (1) light weight (small density ρ);
ii) High rigidity (Young's modulus E is dog);
(low resonance sharpness (appropriately large internal loss), (iV) good processability, etc.) When a pickup cartridge is constructed using a cantilever that satisfies these conditions, Various characteristics of the pickup cartridge can be made suitable.

In other words, when it comes to lightweight as described in item (1) above, the equivalent mass of the vibration system is reduced, the high-frequency resonance frequency is pushed out of the audible band, the frequency characteristics are flattened, and the mechanical impedance is lowered. The high rigidity in item (1[)) eliminates the deterioration of characteristics in the middle and high range due to deflection and split vibration, improving transient characteristics, and furthermore, the internal loss in item (iii) above improves the split vibration. It is possible to realize a pickup cartridge that has extremely good basic performance, such as preventing the absorption of light and providing stable and straightforward characteristics even in ultra-high frequencies.

Conventionally, this type of material has been made of aluminum and its alloys, which can be processed by rolling, extrusion, drawing, etc., and have good workability and a relatively high relative stiffness E/ρ (anodized on the surface to increase rigidity). ), titanium or titanium, which has poor workability but relatively stiffness E/
Metal materials such as beryllium, which have a large ρ, were used.

However, although materials such as aluminum and titanium are relatively easy to handle in terms of processability, their relative stiffness E/ρ is too insufficient to realize a high-performance cantilever, and therefore they cannot be formed into the desired shape. Afterwards, the surface was subjected to alumite treatment to increase its strength, but it was still difficult to obtain the desired stiffness ratio E/ρ.

In addition, in the manufacturing process, Veri IJ
However, it is necessary to install sufficient equipment to prevent problems such as drying, which increases the cost of the equipment, and has the disadvantage that processability is poor, resulting in a very high product cost.

Below is a table of Young's modulus, density, and relative stiffness of conventional materials and material examples used in the present invention.

The present invention was made in view of the above-mentioned problem, and its main purpose is to provide a pick-up cantilever having a very large relative stiffness E/ρ without any difficulty in processing and at low cost. There is a particular thing.

Another object of the present invention is to simply reduce the relative stiffness.
The object of the present invention is not only to obtain a cantilever with a large /ρ but also to provide a pickup cantilever that can obtain better characteristics by focusing on the crystallinity of the material from a physical viewpoint.

Next, embodiments of the present invention will be described with reference to FIGS. 1, 2, and 3.

First, FIGS. 1 and 2 show the EFG method (Edge-Defined, F
iml-Fed, Growth).

In these figures, 1 is a crucible, 2 is a crystalline material such as boron B, boron carbide B4C1 titanium carbide TiC, etc., which has poor workability C and high relative stiffness E/ρ.
It is made into a molten liquid (liquid phase) by heating steps (not shown).

A die 3 has a pinhole formed in the center and has a cross-sectional shape such as a prism or cylinder, and one end of the die is inserted into the melted crystalline material 2 and cannot be moved. It is fixed as follows.

4 is a film layer of melt-like crystalline material material 2; 5 is a first film layer;
In the figure, it is a pulling member having a seed crystal that contacts the film layer 4 in the form of a melt, and is configured to be moved above the crucible 1 (in the direction of the arrow in FIG. 1) by a pulling means (not shown).

In FIG. 2, 6 is a solid phase filament in which the crystalline material 2 is crystallized, although the details will be described later.

In such a configuration (FIG. 1), the molten crystalline material material 2 heated above its melting point by a heating means (not shown) rises through the pinhole of the die 3 due to its capillary action and forms a film layer. , die 3 and pulling member 5
to form between.

Then, by gradually pulling up the pulling member 5 upward (in the direction of the arrow in the figure), the molten crystalline material 2 is crystallized at the interface between the film layer 4 and the pulling member 5, and a single crystal filament is formed. 6 is cultivated.

By pulling the filament further upward, a filament 6 with a long stroke can be obtained (FIG. 2).

At this time, if the cross-sectional shape of the die 3 is made square, the cross-section of the filament to be grown will grow into a square prism, and if the cross-sectional shape is made circular, a round bar can be grown.

What must be kept in mind here is that the pulling member 6
If the crystal axis (for example, C axis) of the pulling member 6 used at the start of crystal growth by pulling is not set upward, that is, in the pulling direction, the crystal axis of the obtained filament will match the axis of the filament 6. Please be careful as this will not happen.

If the filament thus obtained, which has a crystal orientation in the axial direction and has a desired cross section, is cut into an appropriate length,
A cantilever substrate of the present invention is obtained.

Then, desired processing and molding is performed to attach the stylus to this cantilever base.

On the other hand, as explained above, a pick-up cantilever is required to be lightweight and swingable.

Generally speaking, it is desirable to use a material with a small density ρ in order to make it lightweight, but in addition to this, it is also possible to relatively reduce the density ρ even in a material with a certain high density by making it into a cantilever shape and a pipe shape. will be accomplished.

Therefore, as a second embodiment of the present invention, a method for manufacturing this pipe-shaped cantilever will be described with reference to FIG. 3.

FIG. 3 shows a method of manufacturing a pickup cantilever obtained by the same <EFG method as in the first embodiment described above.

Therefore, explanations of the same reference numerals will be omitted.

Both 3A and 3B are dies, which perform the same function as the die 3 shown in the first embodiment.

Further, the member corresponding to the pinhole of the die 3 in which the molten crystalline material 2 intervenes is a slit between the die 3A and the die 3B, and this slit is formed in a circular cross section of the dies 3A and 3B. .

With this configuration, the crystallized pipe-shaped filament 6 is grown by gradually pulling the pulling member 5 upward.

In this case, the outer diameter and inner diameter of the pipe-shaped filament 6 match the outer dimensions of the die 3A and the inner diameter dimensions of the die 3B.

As described above, in the pickup cantilever of the present invention, since the crystal direction is always set in the axial direction, even if left and right vibrations, which are stereo signals, are applied to the cantilever, the strain stress on the left and right sides of the cantilever is equally generated. As a result, faithful reproduction output is obtained without causing problems such as unnecessary distortion or loss of channel balance. Therefore, it is possible to obtain excellent transient characteristics due to the relatively stiff material, as well as excellent crosstalk characteristics. A cantilever can be obtained.

Furthermore, the manufacturing method of the present invention is even more important because the pickup output 6-inch lever made of a material with a high relative stiffness E/ρ, which was conventionally difficult to mold, can be obtained by very simple means, so it can be mass-produced. is possible and can be provided at low cost.

Note that it is ideal that the filament obtained in the manufacturing process of the present invention is crystallized into a single crystal, but even if it does not necessarily become a single crystal, it is preferable that the filament is crystallized in the maximum direction of the average crystal orientation in the axial direction of the filament. As long as it has been cultivated, it may be somewhat random polycrystalline.

Furthermore, the method for manufacturing the filament obtained in the manufacturing process of the present invention is not limited to the EFG method shown in the examples, and in addition to crystallization in the form of a filament, a single crystal growth method may also be used. .

Furthermore, the crystalline material of the present invention may be a compound in addition to the specific examples listed above, and in short, it may be a material that can be crystallized and has a large stiffness E/ρ. It is preferable if there is one.

[Brief explanation of drawings]

The figures relate to the present invention, and Figures 1 and 2 are EFG
FIG. 3 is a process block diagram showing a first embodiment in which filaments are obtained by the EFG method, and FIG. 3 is a block diagram showing a second embodiment in which filaments are obtained by the EFG method. 1... Crucible, 2... Crystalline material, 3... Die, 4... Film layer, 5
... Pulling member, 6 ... Filament.

Claims (1)

[Claims] 1. Aluminum has poor workability and is relatively stiff (E/ρ),
A pick-up cantilever made of a crystalline material larger than titanium, in which the crystal direction of the crystalline material is aligned with the axial direction. 2. A first step of obtaining a filament with the crystalline direction of the crystalline material in the axial direction and a desired cross-sectional shape, and cutting the filament obtained in the first step into a desired length to form a cantilever base. A method for manufacturing a pick-up cantilever according to claim 1, comprising a second step of obtaining.