JPS62183086A - Stabilizer for compact disk - Google Patents

Abstract

PURPOSE:To obtain a stabilizer for a DC, having a vibration attenuation factor, by using a thermosetting resin, a reinforcing material, and an inorganic packing material, as main components. CONSTITUTION:As for a thermosetting resin, an unsaturated polyester resin whose wetting and flow are good, especially is used, and the content rate is selected to 20-35% by a weight reference. As for a reinforcing material, especially, a glass fiber is used, and the content rate is selected to 15-30%. As for an inorganic packing material BaSO4 is used, its wear resistance is increased by adding it about 40-70%, and a necessary weight is given to a thin wall disk plate. Also, in accordance with necessity, 0.2-0.5% benzoyl peroxide, etc., and about 1-2wt% coloring matter, mold releasing agent, thickener, etc., are added to unsaturated polyester, as a curing catalyst. As for a stabilizer by this constitution, the vibration attenuation factor is good, the drop of a reproducing sound quality from a resonance and a mechanical vibration is prevented, and the flatness is held irrespective of a super thin type, and the strength is excellent.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a compact disc stabilizer used to improve sound quality when a compact disc is played back by a disc player.

Conventional Technology Conventionally, brass layers or butyl rubber stabilizers have been used as stabilizers for compact disc players, but the former has been used as a stabilizer for compact disc players. ll2Irft has a small attenuation rate, and since the latter is made of soft rubber, there is almost no vibration damping, and both have good sound quality characteristics during playback (judged mainly by sensory perception).
was not always obtained.

Problem to be Solved by the Invention When a compact disc is played back by a player, slight vibrations are generated in the disc plate due to the rotation of the disc.By reducing these vibrations, playback with clear sound quality characteristics without distortion is possible. The present invention provides a stabilizer that reduces the above-mentioned microvibrations.

The inventors have conducted various studies and experiments on materials for stabilizers that reduce the above-mentioned microvibrations, and have found that materials made from thermosetting ileal compositions exhibit excellent effects. , we have completed the present invention.

The compact disc stabilizer according to the present invention is characterized by containing a thermosetting resin 1M reinforcing material and an inorganic filler as main components.

In the present invention, the main component is a thermosetting resin.

Reinforcing materials and inorganic fillers are used, along with curing catalysts and other additives used in molding processes.

The above-mentioned thermosetting resin includes unsaturated polyester same layer,
Examples include epoxy resin, Urya resin, and phenol W resin, among which unsaturated polyester W resin, which has good demand and flow, is preferably used.

The content of the thermosetting resin is 10 to 40%, preferably 10 to 40%, based on the weight of the molding composition.
If it is 20 to 35%, if it is less than 10%, it will be difficult to obtain a good molded product, and if it exceeds 40%, the sound quality characteristics will deteriorate.

Reinforcing materials are added to reinforce thin-walled stabilizers, and include polycrystalline materials such as glass fiber, alumina W4 fiber, and carbon compact, chemical m-cone materials such as nylon, vinylon, and polypropylene, non-arsenic metal fibers, Natural fibers such as hemp and paper materials are used, and among them, glass fibers have high strength and are preferred in terms of dimensional stability, etc. The reinforcing material content is 5 to 40%, preferably 15 to 30%. . If it is less than 5%, the strength of the stabilizer disc plate will be insufficient, and if it exceeds 40%, it will be difficult to mold the disc plate into a predetermined shape. By adding this reinforcing material, sufficient mechanical strength can be obtained even for an ultra-thin stabilizer. In addition, in the case of glass fiber, it is preferable to perform a surface treatment such as silane treatment on the surface.

Next, the inorganic filler! The inorganic filler is generally added to the synthetic resin, such as aluminum hydroxide, calcium carbonate, barium sulfate, or a mixture thereof. Barium sulfate, which has a large specific gravity, is good in terms of weight imparting, and the amount added is 2
It is 0-85%, preferably 40-70%. If the amount added is less than 20%, the M fat will flow to the surface during molding, making it difficult to mold, and if it exceeds 85%, it will be difficult to mold, even when pressurized, and even if molding is possible, the surface will not be smooth. Because you can't get it.

In addition to the above-mentioned main components, if necessary, a curing agent corresponding to each thermosetting resin is used as a curing catalyst, such as benzoyl peroxide in the same layer of unsaturated polyester, and the amount added is usually 0. It is about 2 to 0.5%. In addition, colorants, internal mold release agents, thickeners, and the like are added as other additives. The amount to be added may generally be 1 to 2%.

To manufacture temporary stabilizer discs, the above components are blended to a total weight of 100%, kneaded to form a uniform composition, and a predetermined amount of this is injected into a mold, and each thermosetting resin is Molding is performed by compression molding or the like under molding conditions according to the conditions, and a hollow disc having a thickness of 0.4 to 1.0 mm is obtained.

The present invention will be explained in more detail below using three examples.

Legend: A composition for compact discs was prepared according to the following recipe.

Part by weight: Unsaturated polyester grease 21 0S 06 HA 498 A) Curing agent α5 (Nippon Oil & Fats Co., Ltd., Permicle D) Pigment, etc. 1.5 The composition obtained by thoroughly kneading the above raw materials is molded. Filled with water, pressurized (100 kg/cm2) and heated (160°C
1 minute) to form an outer diameter of 118 mm and an inner diameter of 15.6 mm.
mm1. Thickness Q 4 mm + weight ff18 It's a disgrace to the hollow disc.

Next, the vibration damping rate of the above product was measured. ? ! ! In the first fixed method, a rubber columnar body is fixed in the center hole of a disk so that the center is fixed, the periphery is left free, and an electromagnetic vibrator is placed at one end of the outer edge of the disk to temporarily generate Ff! ! Vibration is applied, and the vibration is detected by an electromagnetic vibration detector at the outer edge of the disk, which is symmetrical to the vibrator with respect to the center. I recorded 2. Note that the vibration was applied at a vibration frequency close to the rigid rj vibration frequency of the disk. This attenuation curve is shown in Figure 1.

Also, when this product was placed on a compact disc and played back, the sound quality was high resolution and clear.

Comparative Example Using a commercially available stabilizer made by Company A with a brass layer and a thickness of L 0 mm, the vibration attenuation rate was measured in the same manner as in Example 9. The results are shown in Figure 2.

Comparing FIG. 1 and FIG. 2, it can be seen that in the actual flow example, the vibration damping rate is large, and therefore the vibrations applied from the outside and the vibrations caused by the rotation of the compact disk can be significantly reduced.

On the other hand, it can be seen that the comparative example has a low vibration damping rate, and therefore has a very low ability to damp the vibrations of the compact disc.

Furthermore, the reproduced sound according to the comparative example had insufficient resolution and lacked clarity compared to the actual example.

Effects of the Invention The stabilizer according to the present invention has a good vibration reduction rate,
16 has the characteristics of reducing the deterioration of the sound quality of reproduced sound due to resonance and mechanical vibration, and even though it is ultra-thin, it maintains flatness, has excellent strength, and is easy to handle. has advantages.

[Brief explanation of drawings]

FIG. 1 and FIG. 2 are T drawings showing vibration damping waveforms in an actual legend and a comparative example, respectively. Patent applicant Nippon Light Metal Co., Ltd. Nikkei Shoji Co., Ltd. Hakusan Seisakusho Co., Ltd.

Claims (1)

[Claims] 1. A compact disc stabilizer characterized by containing a thermosetting resin, a reinforcing material, and an inorganic filler as main components.