JPS5868203A - Stabilizer - Google Patents

Abstract

PURPOSE:To improve adhesion to a record disk and oscillation absorbability, by bringing the record disk into linear or spot contact with numbers of projections provided to a main body made of rubber which has prescribed hardness and a prescribed coefficient of repulsive elasticity, and making the diameter of a center hole less than a spindle diameter. CONSTITUTION:A stabilizer body 1 is formed of a rubber material which has an extremely low hardness of <=30 deg. by an A type rubber durometer and >=15 deg. by an F type rubber durometer and a high coefficient of repulsive elasticity of >=50%. On the contacting surface of a record disk, numbers of projections 3 are provided to allow linear or spot contact with the record disk. The diameter of a center hole 2 is made less than a spindle diameter to improve adhesion to the spindle, thereby applying pressure to the record disk. Consequently, the adhesion to the record disk is improved, and oscillation absorbability is also improved.

Description

[Detailed description of the invention] The present invention relates to a novel stabilizer.

When playing a record, if the adhesion between the record and the turntable rubber sheet deteriorates, the reproduced sound becomes muddy or floaty. This tendency is especially strong when the record is warped. For this reason, stabilizers have traditionally been used to keep records in close contact with the rubber sheet for turntables. 〇 Stabilizers made of hard rubber have traditionally been used, but this hard rubber stabilizer is made of Generally speaking, the adhesion with the record is poor, and therefore, sufficient adhesion cannot be achieved without increasing the weight, but this can cause malfunctions as many of the recent fully automatic players have low starting torque. A problem arises. In order to solve this problem, it is possible to make the hole drilled to insert the stabilizer into the spindle shaft of the record player smaller in diameter than the spindle shaft, but this would cause vibrations in the spindle shaft. A problem arises in that the signal is easily transmitted to the record through the stabilizer.

In view of the above points, the present invention aims to provide a stabilizer that has good adhesion to a record.

That is, the present invention is a vulcanized product of rubber, which has a hardness of A.
It is made of a rubber material that has a hardness of 30° or less on a type rubber hardness tester, 15' or more on a type 1 rubber hardness needle, and a rebound modulus of 50% or more, and the contact surface of the main body with the record is substantially equal to the record. The present invention relates to a stabilizer characterized in that a large number of protrusions that can make S contact or point contact are provided on the stabilizer, and a hole with a diameter slightly smaller than the spindle shaft of a record player is bored in the center of the main body.

The first feature of the present invention is that, as mentioned above, a rubber material with ultra-low hardness and high repulsion elasticity is used. The stabilizer of the present invention made of a rubber material with unique physical properties has significantly better adhesion to records than conventional stabilizers made of hard rubber. In addition, the stabilizer made of this unique rubber material has excellent vibration absorption properties, so it absorbs the vibrations of the record and prevents howling and deterioration of playback quality caused by external vibrations, a feature not found in conventional stabilizers. has.

The second feature of the present invention is that the contact surface with the record is provided with a large number of protrusions that substantially make line contact or point contact with the record. The stabilizer of the present invention is of a type in which the hole through which the spindle shaft of the record player is inserted is made slightly smaller in diameter than the spindle shaft so as to apply pressure to the record, and the rubber material used is of a vibration-absorbing type as described above. In addition to this, the provision of the protrusions makes the area of contact with the record extremely small, so there is no risk that vibrations of the spindle shaft will be transmitted to the record via the stabilizer.

However, when using the stabilizer of the present invention, the record is brought into close contact with the rubber seam F for the turntable, and the vibration of the record is absorbed and the vibration of the spindle shaft is not transmitted to the record. The vivid sounds, flowing Shin7Oe, and clear vocal sounds are faithfully reproduced.

The rubber material used in the present invention has a hardness of 500 or less on the A#Il rubber hardness tester, 15° or more on the YFI rubber hardness tester, and a rebound modulus of 50 strokes or more.

In the above, the rubber hardness needle is J Engineering S! 6501-
This is a rubber hardness needle specified in 1969.

Also, the C-shaped rubber hardness needle refers to the rubber hardness meter Asker-1 source manufactured by Kobunshi Keiki ■, which is mainly used to measure the hardness of 7 ohm, -murapa, urethane 7 ohm, etc. . Although the rubber material used in the present invention is solid rubber, its hardness is extremely low, and there are some that cannot be measured with a rubber hardness needle that is normally used to measure the hardness of solid rubber. The lower limit of the hardness of the rubber material is '1! fIi Defined by the hardness measured with a rubber hardness needle.

Also, the hardness between the Ai rubber hardness needle and the type 1 rubber hardness needle is 0.
It may also be measured with a molded rubber hardness needle. Here, the type 0 rubber hardness needle is specified by the Japan Rubber Tube Metal Standard SRI&-0101, and is used to measure hardness between the HML rubber hardness meter and the type 7 rubber hardness needle. . Mainly used to measure the hardness of sponges and soft rubber. Furthermore, O
As the type rubber hardness meter, a rubber hardness meter Asker type 0 manufactured by Kobunshi Keiki ■ was used.

The hardness of the rubber material used in the present invention may be measured with any type A rubber hardness meter, type 0 rubber hardness meter, or type 7 rubber hardness meter as long as it can be measured.

However, if the hardness is 1° or less with a type A rubber hardness needle, it is preferable to measure with a type 0 rubber hardness meter or a type 1 rubber hardness needle, since measurement with a rubber hardness needle of type A will result in a large measurement error.

Similarly, if the hardness is 1° or less with the ON rubber hardness meter, it is preferable to measure with a type 1 rubber hardness meter. Further, if the hardness is 99° or more with an O-type rubber hardness meter, it is preferable to measure with an A-type rubber hardness meter.

Similarly, if the hardness is 99° or more with an IPg rubber hardness needle, it is preferable to measure with an O-type rubber hardness meter or a M-type rubber hardness needle. In addition, hereinafter, the hardnesses measured with a M type rubber hardness meter, a type 0 rubber hardness meter, and a type 1 rubber hardness needle are referred to as M hardness, C hardness, and 1 hardness, respectively.

The rubber material used in the present invention has a hardness of A hardness of 50° or less, preferably 200 or less, and 1 hardness of 1 where <10° or less.
5° or more, but < 30° or more, and the rebound modulus is 50 or more, preferably 60% or more, and <
Although it is a vulcanized rubber with a rubber resistance of 70 or more, no practical rubber material having such rubber physical properties has been known to date. In other words, in the case of conventional practical rubber materials, the hardness is 6.
If the angle is 0° or less, the rebound modulus is less than 40%, for example, about 10 to 20%. Conventionally, when the hardness of vulcanized rubber is lowered, the rebound modulus of the Wg fiber is also lowered, and in the present invention, the hardness is A hardness of 30' or less, preferably 20° or less, and especially <10° or less and the rebound modulus is 50 or more,
A practical rubber material having rubber physical properties of preferably 60% or more, preferably <70% or more, cannot be predicted from the prior art.

The rubber material used in the present invention has excellent adhesion to records due to the above-mentioned unique rubber physical properties, and also has excellent vibration absorption properties, particularly vibration absorption properties in the ultra-low frequency range of about 5 to 10 Hg.

Therefore, the above-mentioned excellent adhesion and vibration absorption properties are obtained when the hardness is A hardness SO° or less, preferably 20° or less, especially 1 hardness 150 or more, where <10° or less, especially 30
It is exhibited by a vulcanized rubber having a specific physical property value of 0 or more and a rebound modulus of 50% or more, preferably 60% or more, where <70- or more. If the hardness and rebound modulus are outside the above ranges, the adhesion and vibration absorption properties will be poor, which is not preferable.

In addition to the above-mentioned physical properties, the rubber material used in the present invention has a tensile strength of roughly 0.1 to 1100 ks, especially 1 to 5.
0 to 2/am2, elongation of 50 to 1000≦, and preferably <200 to 1000%.

The vulcanized rubber having the specific cuttability value is (4) Rubber component 1
00 parts (parts by weight, same below), body) 7 Acunas 5-20
00 parts, preferably 50 to 2000 parts, <10
0 to 2000 parts and (0) 20 to 2000 parts of softener,
Preferably 100 to 2000 parts, and <200 to 2
000 parts by vulcanizing a rubber composition.゛The rubber composition formed by blending a large amount of 7 actis and a softener with such a rubber component is a new rubber composition, and by vulcanizing the side of such a new rubber composition, the hardness can be reduced to 30° or less on the M hardness scale. , preferably 20° or less, where 1 hardness is 15° or more, where 1 hardness is 15° or less, where 1 hardness is 15° or less, and where
This is the first time that a specific vulcanized rubber has been found where the angle is 50° or more and the rebound modulus is 50% or more, preferably 60% or more, especially <70% or more. It is known that polynorbornene can be changed to an A hardness of about 7° by adding a large amount of softener, but it does not contain 7 actis and bleeds heavily, making it impractical for the soles. do not have. In the present invention, by blending a large amount of 7actis with a large amount of softener into the rubber component, bleeding is suppressed and the specific vulcanized rubber with low hardness and high rebound is obtained.

The rubber component of component (A) is not particularly limited, but examples include polynorbornene, natural rubber, isoprene rubber, chloroprene rubber, styrene-butadiene rubber, butadiene rubber, butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber, nitrile rubber, and acrylic rubber. , v: i-rethane rubber, chlorinated polyethylene, chlorosulfonated polyethylene, shrimp chlorohydrin rubber,
Examples include those mainly composed of one or more of polysulfide rubber and silicone rubber, and these rubber components also include recycled rubber (for example, rubber powder). These rubber components may be solid (powder, pellet, block, sheet, etc.) or liquid (liquid rubber, latex, etc.). Among the above-mentioned rubber components, those mainly composed of polynorbornene are preferable, and in this case, the proportion of polynorbornene is at least 50% (weight range, the same applies hereinafter) of the total amount of the rubber component, and preferably <65% or more. Preferred @) 7 actis ingredients include linseed oil,
Rapeseed oil, soybean oil, go! Various types of 7-actis such as white 7-actis, black 7-actis, amber-colored 7-actis, and blue 7-actis, which are obtained by vulcanizing various vegetable oils such as oil, tung oil, and mustard oil, with sulfur or sulfur chloride, are used. These 7 actis may be used alone or in combination. In particular, factice obtained by vulcanizing rapeseed oil is preferable.

Examples of the softening agent (0) include oils, plasticizers, and other softening agents. As the oil, any of those commonly used as additive oils (softening oils, process oils, etc.) for rubbers, such as aromatic oils, naphthenic oils, paraffin oils, vegetable oils, and animal oils, can be used. Examples of the vegetable oil and animal oil include mustard oil, rapeseed oil,
Examples include linseed oil, whale oil, and fish oil.

As the plasticizer, any of those commonly used as vibrating agents for rubbers with a large softening effect may be used, such as dibutyl phthalate, dioctyl heptatalate, dioctyl sebacate, and the like. Other softeners include liquid rubber. The softeners may be used alone or in combination of two or more. Ordinary oil alone or a combination of oil and plasticizer is preferred.

Furthermore, in addition to components (4) to (0), the rubber composition contains commonly used rubber compounding agents such as fillers such as carbon black and zinc oxide, colorants, lubricants such as stearic acid, and anti-aging agents. They may be blended as appropriate within a range that does not impair the physical properties.

Any conventional vulcanization system may be used to vulcanize the rubber composition, and sulfur vulcanization or sulfur-free vulcanization may be used. Vulcanization conditions are not particularly limited, and normal conditions are employed.

The following is a typical composition ratio of the rubber composition, taking the case of sulfur vulcanization as an example.

(Components) (Part) Rubber component 1007 Actis
100-2000 Softener
200-2000 filler
1-100 Anti-aging agent 0.5-
6 Sulfur 0.5~
1° Vulcanization Accelerator 1-20 The stabilizer of the present invention uses the above-mentioned specific rubber material as a constituent material and has the shape specified as follows. In other words, the shape of the stabilizer of the present invention is such that a large number of protrusions are provided on the surface of the main body that comes into contact with the record, which make substantially line contact or point contact with the record, and the center of the main body has a diameter slightly smaller than the spindle shaft of the record player. It has a hole drilled in it.

Next, the shape of the stabilizer of the present invention will be explained with reference to the drawings. FIG.
The figure is a partially enlarged perspective view of the outer w4 portion.

In Figs. 1 to 3, (1) is a plate-shaped body made of the specific rubber material and having a circular planar shape;
A hole (2) through which the spindle shaft of the record player is inserted is bored in the center of the main body (1), and a large number of protrusions (2) are provided which substantially make line contact or point contact with the contact f of the main body (1) with the record disc.
8) is provided.

The upper surface of the main body (1) is completely flat.

The shape of the protrusion (8) is not particularly limited as long as it can make substantial line or point contact with the record, and various shapes can be adopted. Some examples include watery shapes. Examples of the shape of this aspect include a roof shape,
Examples include semicylindrical shapes, and those with knife-shaped tops are particularly preferred. Another preferred protrusion (8) is one in which at least its top is pointed so that it can make point contact with the record.

The shapes of this aspect include, for example, pyramidal shapes (including triangular pyramids and polygonal pyramids larger than quadrangular pyramids, the same applies hereinafter), conical shapes (including elliptical pyramids, the same applies hereinafter), dome shapes (near spheres, hemispherical ones) (including cylinders with rounded tops, the same applies hereinafter), etc., and those with needle-shaped tops are particularly preferred. In addition, in the protrusions of the above two types of embodiments, it is sufficient that only the top portions thereof are sieve-like or pointed, and the shape of the base portions is not particularly limited. For example, the shape may be such that a truncated pyramid, truncated cone, or other base is topped with a roof-shaped, power-shaped, pyramid-shaped, conical, or dome-shaped top.

Further, shapes other than the above embodiments may be used as long as the protrusions can make substantial line or point contact with the record; for example, truncated pyramidal, truncated conical, prismatic, cylindrical, etc. protrusions may also be used. Incidentally, by providing rough notches at the tops of these protrusions, m-contact or point-contact may be achieved.

The protrusions (8) may be arranged randomly or regularly on the contact surface with the record. Examples of the regular arrangement include concentric circular shapes (including concentric elliptical shapes, concentric polygonal shapes, etc.; the same applies hereinafter), spiral shapes, radial shapes, lattice shapes, linear shapes, and the like. The individual protrusions may be provided at appropriate intervals, or may be provided close to each other, or may be a combination thereof. When provided closely together, the bases of adjacent protrusions may be interconnected and integrated. A preferred arrangement is one in which the protrusions are closely arranged in a shape such as concentric circles, and the closely arranged rows of protrusions trap air between them and other members, resulting in better vibration. A blocking effect is produced.

The protrusion (+1) in the embodiment shown in FIGS. 1 to 3 has a knife-like sieve portion and a sieve-like base portion that widens at the end, and such a sieve-like protrusion is particularly preferable as the protrusion (8) in the present invention. It is.

In the following, when simply referring to the projections (8), it means the cribriform projections. In the embodiments of FIGS. 1 to 3, the cribriform projections (3) are arranged concentrically in close contact with each other, and A row of protrusions (
4) ((4m) and (4'b)) are constructed. When the sieve-like protrusions (8) are arranged concentrically, the sieve portion (3a) is connected to the main body (1) as shown in FIGS.
) is preferably provided along the radial direction. In this case, in the adjacent rows of projections (4 &) and (4b), some or all of the projections (8) in one row of projections (4a) are the same as the projections (8) in the other row of projections (4b). Main body (1)
may overlap in the radial direction, but such an overlap as shown in Figures 2 and 4 (corresponding to the (4) integral) line portion enlarged sectional view (expanded on a plane) in Figure 2) In order to prevent this from occurring, the sieve part (3&) of the protrusion (8) in one protrusion row (4&) is
) may be provided so as to correspond to the valleys (3b) between the protrusions (8) in the other protrusion row (4b) in the radial direction.

The protrusion (8) is as shown in Fig. 1 and Fig. #I3,
It may be provided directly on the main body (1), or as shown in Figures 5 to 7 below, a concentric convex band (5) may be provided on the main body (1), The latter embodiment corresponds to one in which the bases of the protrusions provided closely together are integrated.

The height of the protrusion (8) [from the lowest part of the trough (3b) to the sieve part (3
The height up to a) is preferably 0.1 to 5I11, and preferably <0.3 to 2mm. Although the number of protrusions (8) and the number of protrusion rows (4) are not particularly limited, for example, the number of protrusion rows (4) is usually 1 to 4. The rows (4) of protrusions may be provided at appropriate intervals as shown in FIGS. 1 and 2, or may be provided without any intervals.

FIG. 5 is a vertical sectional view showing another embodiment of the shape of the stabilizer of the present invention, FIG. 6 is a bottom view thereof, and FIG. 7F! ! J is a partially enlarged perspective view of the outer periphery.

In the embodiment shown in FIGS. 5 to 7, projections (1) are provided on both sides of the main body (1), and seven lunges (6) are provided on the outer periphery of both sides of the main body (1). It is being

The protrusion (8) is provided on a concentric convex band (5) provided on the main body (1).

The 7 rung section (6) provided on the contact surface with the record improves adhesion to the record and airtightly traps an air layer between the stabilizer and the record, thereby improving vibration isolation. It has the function of improving It also has the function of increasing the rigidity of the stabilizer. The flat surface (6a) of the 7 rung part (6) is usually a protrusion (8)
The sieve part (5&) of The most extreme wii! ! Although the row of protrusions (4b) No. 6 is provided in contact with the No. 7 rung portion (6), it may be provided apart from the −7 No. 7 rung portion (6).

In the fifth to seventh embodiments, a protrusion (8) and a seventh rung (6) are also provided on the top surface of the main body (1), but these mainly serve a decorative role. , either one or both may be omitted. Further, the protrusion (8) may be provided directly on the main body (1) without being provided on the convex band (5).◎ In the stabilizer of the present invention, the hole (2) through which the spindle shaft is inserted is Although it has a slightly smaller diameter, by adjusting its diameter, the pressure applied to the record can be adjusted to an appropriate level.

In the stabilizer of the present invention, it is sufficient to provide at least the protrusion (8) on the contact surface with the Tomo record disc, and if necessary, the seven rung part (6), and the shape of the upper surface is not particularly limited, and the first to The entire surface may be flat as in the embodiment shown in Figure 4, or it may have a protrusion (8) as in the embodiment in Figures 5 to 7.
and/or seven rungs (6) may be provided. Furthermore, shapes in which the wall thickness gradually decreases or increases toward the outer periphery are also adopted.

The planar shape of the main body (1) is usually circular, but other shapes such as a polygon may also be adopted.

In order to produce the stabilizer of the present invention, the above-mentioned specific rubber composition may be vulcanized and molded into the above-mentioned specific shape. Bye. For example, the rubber composition may be directly press-vulcanized in a mold having an appropriately shaped cavity, or an unvulcanized molded product is first made by calender molding or extrusion molding, and then this molded product is pressed. Vulcanization may be used, and injection molding is also possible. The protrusion (+9) is preferably formed at once using a mold, but may be formed by cutting after vulcanization.

Next, the stabilizer of the present invention will be explained with reference to reference examples and examples.

Reference Examples 1 to 4 Vulcanized rubber sheets were produced using rubber compositions with the formulations shown in Table 1. First, the rubber component was made into a wire at around 60oO, other compounding agents were added thereto, and a Banbury mixer was used. After kneading with a roll,
An unvulcanized sheet having a thickness of about 10 am was obtained by sheeting. This sheet was cut into appropriate sizes and vulcanized using a press at a pressure of 150, 9/10!112 and a temperature of 155 for 20 minutes to obtain a vulcanized sheet.

Appropriate test pieces were cut out from the obtained vulcanized sheet and various physical property values were measured. The results are shown in Table 2. Repulsion modulus, tensile strength and Note 1 = Nippon Zeon ■Sold by Polynorbornene (Nosolex, average molecular weight 2,000,000 or more) 100 parts extended with 150 parts of 7-tene oil (Nosolex: Registered Trademark 1K) 2: Polynorbornene (average molecular weight 2 million or more) sold by Nippon Zeon ■ 5 parts Styrene-butadiene rubber manufactured by Nippon Zeon ■ 100
Extended with 37.5 parts of highly aromatic oil 4: Amber-colored sulfur factis manufactured by German Cheonil 7 Applique Dr. Grundel 5; Nippon Sunoil ■ 7 Ten-based oil 6: 1 Fragrance Group oil 7: 2,2I-methylene-bis(4-
Methyl-6-t@rt-butylphenol) 8: Diphenyluane-based anti-aging agent manufactured by Bayer 9: Seiko Chemical ■
Microcrystalline Wax 10 manufactured by Sanshin Kagaku ■ Vulcanization accelerator Table 2 Example 1 Using the rubber composition of Reference Example 1, press vulcanization was performed under the same vulcanization conditions as Reference Examples 1 to 4. The stabilizer shown in FIG. 7 (weight: 552) was manufactured. The outline of its shape is as follows.

Diameter of main body (1): 870 parts Thickness of main body (1): 815 parts Height of protrusion (8) = 0.5 Height of convex band (5): 0.5 mm 7 runs 46) 7 )height ! 1mm Diameter of hole (2) + 5.9++ on (Diameter of spindle shaft 7.2mm) Place a slightly warped record on the rubber sheet of the record player, and attach the stabilizer obtained above to the spindle shaft. When I played a record, the playback sound was not muddy or floaty, and the playback was faithful.

Stabilizers were produced in the same manner as in Example 1 using the rubber compositions of Examples 2 to 4 and Reference Examples 2 to 4, respectively. When a record was played using each of the stabilizers obtained, faithful playback was achieved as in the case of Example 1.

[Brief explanation of the drawing]

Fig. 1 is a vertical sectional view showing one embodiment of the stabilizer of the present invention, Fig. 2 is a bottom view thereof, Fig. 3 is a partially enlarged perspective view thereof, and Fig. 4 is a (1)-(A) of Fig. 2. 5 is a vertical sectional view showing another embodiment of the stabilizer of the present invention. FIG. 6 is a bottom view thereof, and FIG. 7 is a partially enlarged perspective view thereof. (Main symbols of FgJ surface) (1): Main body (2): Hole (8) Zero protrusion Protrusion (4) Row of 8 protrusions (s) s y lange section'' 71 Fig. 22 country

Claims (1)

[Scope of Claims] 1. A vulcanized product of rubber, which has a hardness of All rubber. 3.
Made of a rubber material with a hardness of 30 degrees or less on a hardness meter (1F or more on a rubber hardness needle) and a repulsion modulus of 50% or more, the contact surface of the main body with the record has substantially line contact with the record. Alternatively, stabilizer 〇2 is characterized by having a large number of point-contact protrusions and a hole slightly smaller in diameter than the record player's spindle shaft drilled in the center of the main body. 7. The stabilizer according to claim 1, wherein the stabilizer is provided with seven flange portions. 5. The protrusions are peak-like protrusions with a knife-like phloem-like part and a tail part that widens at the end, and the protrusions are closely arranged concentrically around the hole through which the spindle shaft of the record player is inserted. The stabilizer according to claim 1 or 2, wherein the sieve portion extends in the radial direction of the main body.