WO2000041179A1

WO2000041179A1 - Precision device

Info

Publication number: WO2000041179A1
Application number: PCT/JP1998/006012
Authority: WO
Inventors: Yasuyuki Ohira; Mitsuo Hori
Original assignee: Shishiai-Kabushikigaisha
Priority date: 1998-12-28
Filing date: 1998-12-28
Publication date: 2000-07-13

Abstract

A precision device equipped with a built-in motor for moving or rotating a recording medium such as a magnetic tape or disc. Examples of such a precision device are an audio recording/reproducing device using a magnetic medium, e.g., a tape recorder, an MD recorder, or a digital audio recorder (DAT recorder), and a video recording/reproducing device, e.g., a video recorder or a camcorder. Inside such a precision device, a material as a measure against vibration occurring in the device is provided. The material contains a vibration energy converting compound, in which the component constituting the material is dipole-combined with an active component for increasing the dipole moment in the material. Thus the noise and chattering due to vibration generated inside the device are efficiently absorbed and eliminated.

Description

Itoda ¾ Precision instrument Technical field The present invention relates to a precision instrument adapted to run or rotate a recording medium such as a magnetic tape or a disk. More specifically, the present invention relates to a precision device capable of efficiently absorbing and removing noise and chatter caused by vibration generated inside a device main body when a recording medium is run or rotated. 2. Description of the Related Art Conventionally, as a precision device for moving or rotating a recording medium such as a magnetic tape or a disk, for example, a magnetic medium such as a tape recorder, an MD recorder, and a digital recorder (DAT recorder) has been used. The recording and playback devices used, and video recording and playback devices such as video recorders and video cameras are commercially available. Conventionally, for example, in a tape recorder or a video camera, a rotating shaft is rotated by a motor, and with the rotation of the rotating shaft, a cassette type magnetic tape that is fitted coaxially is used.

(Sound or video recording medium) The magnetic tape unwound from one reel passes through the head in the process of being sent to the other reel, and the sound or video is recorded at this head. Recording or video recording) is to be played. However, since these tape recorders and video cameras have a built-in recording unit inside the device itself, when recording, in addition to the sound to be originally recorded, when the recording medium is run or rotated with a motor, Noise caused by vibrations However, there was a problem that the sound was not picked up and the clear sound could not be reproduced. Such a technical problem also occurred in other precision equipment having a built-in recording unit. In addition, the compactness of precision equipment reduces the distance between the recording unit and the source of noise inside the equipment itself, resulting in the possibility that noise may cause troubles. However, while promoting compaction, the theme had to be overcome. In the case of precision equipment such as a video camera that is held and operated by the user, vibration generated when the recording medium is run or rotated is transmitted from the chassis inside the equipment via the casing to the precision equipment. Propagation to the user who operated the device caused this discomfort such as tingling and tingling (hereinafter referred to as chattering). The present invention has been made in view of such a technical problem, and has been developed in order to efficiently absorb and remove noise and chatter caused by vibration generated inside a device body when a recording medium is run or rotated. The purpose is to provide equipment. DISCLOSURE OF THE INVENTION As precision equipment for moving or rotating a recording medium such as a magnetic tape or a disk, there are, for example, recording and reproduction using a magnetic medium such as a tape recorder, an MD recorder, and a digital audio tape recorder ( _DAT recorder). Devices, video recorders, and video recording and playback devices such as video cameras. In such precision equipment, in order to efficiently absorb and remove noise and vibration caused by vibrations generated inside the device main body, in the present invention, a vibration countermeasure material including a vibration energy conversion compound is disposed inside the device main body. . First, the ₃ vibration management materials describing the vibration management materials, their function, in terms of applications, the damping material having a vibration energy damping capability of removing absorb vibration energy, insulating the transmission of vibration energy or There are anti-vibration materials with the ability to relax. The precision instrument of the present invention is characterized in that one or both of the vibration damping material and the vibration damping material are arranged inside the instrument body. The vibration energy conversion compound contained in these vibration countermeasure materials is a material in which a component constituting the material and an active component that increases the amount of dipole moment in the material are dipole-bonded. When the vibration control material is a vibration damping material, polyvinyl chloride (PVC), polyethylene (PE), chlorinated polyethylene (CPE), polypropylene (PP), ethylene-mono-vinyl acetate copolymer, polymethacrylate Methyl acrylate, polyvinylidene fluoride, polyisoprene, polystyrene (PS), styrene-butadiene-acrylonitrile copolymer (ABS), styrene-acrylonitrile copolymer (AS), acrylonitrile-butadiene rubber ( NBR), Acrylic rubber (ACR), Styrene-butadiene rubber (SBR), Butadiene rubber (BR), Natural rubber (NR) , Isoprene rubber (IR), and chloroprene rubber (CR). In particular, the above PVC, PE, PP, ethylene-vinyl acetate copolymer, poly (methyl methacrylate), and polyfluoride have a glass transition point (Tg) in the operating temperature range (20 ° C to 40 ° C). To a polymer consisting of vinylidene, polyisoprene, PS, ABS and AS, a plasticizer such as di-2-ethylhexynolephthalate (DOP), dibutyl phthalate (DBP), diisononyl phthalate (DI NP) is added. Tg is preferably moved to the operating temperature range, or a rubber-based polymer consisting of NBR, ACR, SBR, BR, NR, IR, and CR with Tg originally within the operating temperature range is preferred:> When the vibration-proof material is a vibration-proof material, the components that make up the material are basically the same as the above-mentioned vibration-damping material. But preferred. FIG. 1 schematically shows the arrangement of the dipoles 12 inside the material 11 before vibration energy is applied. Arrangement of dipoles 1 2 shown in FIG. 1 however _c said to be in a stable state, the vibration energy can pressurized Waru material 1 1, as shown in FIG. 2, the dipoles present in the inner material 1 1 When a displacement occurs in 1 2, each dipole 1 2 inside the material 1 1 is put into an unstable state, and each dipole 1 2 tries to return to the stable state shown in FIG. At this time, energy is consumed. It is considered that the damping effect and the vibration damping effect are generated through the displacement of the dipole inside the material and the energy consumption due to the restoration action of the dipole. When considering the mechanism of absorption and conversion of such vibration energy, it can be seen that the amount of dipole moment inside the material 11 as shown in FIGS. 1 and 2 plays a significant role. That is, when the amount of the dipole moment inside the material 11 is large, the absorption and conversion function of the vibration energy of the material 11 increases. The amount of dipole moment in the material varies depending on the types of components constituting the material described above. Even if the same material components are used, the amount of dipole moment generated in the material changes depending on the temperature at which the vibration energy is applied. Also, the amount of dipole moment changes depending on the magnitude of vibrational energy applied to the material. For this reason, it is desirable to appropriately select and use a material component having the largest dipole moment amount in consideration of the temperature at which the vibration energy acts and the magnitude of the vibration energy. However, when selecting the components that make up the material, not only the amount of dipole moment in the material, but also the material's handleability, moldability, availability, temperature performance (heat resistance and cold resistance), weatherability, price, etc. It is desirable to consider Active components that increase the amount of dipole moment in the material are dipole-bonded to the components that make up this material. The active component is a component that dramatically increases the amount of dipole moment in the material. The active component itself has a large dipole moment, or the dipole moment of the active component itself. Is a small but dipolar-coupled component that can dramatically increase the amount of dipole moment in the material: An active component that has such an effect. Examples include NN-dicyclohexylbenzothiazyl-2-sulfenamide (DCHB SA) 2-mercaptobenzothiazole (MBT), dibenzothiazyl sulfide (MBTS) N-cyclohexylbenzothiazyl 1-Sulfenamide (CBS) N-tert Monobutyl benzothiazirue 2-Sulfenamide (BBS) N-Oxyjeti Lembenzothiaziru 2-Sulfenia A compound containing a benzothiazyl group such as NN-diisopropyl benzothiazyl 2-sulfenamide (DPBS), a benzotriazole with a azole group bonded to the benzene ring, and a phenyl group bonded to it 2— {2 '—Hide mouth xy 3'-(3 ", 5", 6 "tetrahydrophthalide midemethyl) 1 5'—Methylphenyl} —Benzotriazo-nole (2HPMMB) 2— { 2'-Ed mouth 5'-Methyl phenyl} Benzotriazol (2 HMP B) 2— {2'-Hydroxy-1 3'-t-butynoley 5'-Methyl phenyl) 1 5-Chemole Benzotriazole (2 HBMP CB) 2-{2 'one-sided oxy 3' 5 'di-t-butylphenyl}-benzotriazole group such as benzotriazole (2 HDBPCB) A compound having a diphenyl acrylate group such as ethyl 2-cyano 3,3-diphenyl acrylate;

Compounds with a benzophenone group, such as 2-hydroxy-4-methoxybenzophenone (HMBP), 2-hydroxy-14-methoxybenzophenone-15-sulfonic acid (HMBPS), or dicyclophene Examples thereof include one or more selected from phthalic esters having a structure represented by the following chemical formula, such as hexyl phthalate.

Chemical formula

(In the formula, R is a phenyl group, a cyclohexyl group, a cyclopentyl group, a cyclooctyl group, a 4-methylcyclohexyl group, or any two of these groups, _Q. ) The amount of dipole moment in the component, like the amount of dipole moment in the material, varies depending on the type of active component. Even when the same active ingredient is used, the amount of dipole moment generated in the material changes depending on the temperature when vibration energy is applied. Also, the amount of dipole moment changes depending on the magnitude of vibrational energy applied to the material. For this reason, it is necessary to select and use the active component that gives the largest amount of dipole moment in consideration of the temperature and the magnitude of the vibration energy when using the material to which the vibration energy conversion compound is applied. desirable. The dipole coupling in this vibrational energy conversion compound means a coupling by electric or magnetic energy acting between dipoles. By such a coupling force, one component constituting the material, one or Multiple active components are dipole-coupled at one or more locations, and the amount of dipole moment, i.e., the number of dipoles, the magnitude of the dipole charge, or the distance between the positive and negative sides of the dipole Or all of them will increase exponentially. For example, the amount of the dipole moment generated in the material 11 under the predetermined temperature conditions and the magnitude of the energy is shown in FIG. 3 by the dipole coupling between the component constituting the material and the active component. Thus, under the same conditions, the amount will increase by a factor of three or ten. In addition, the mechanism of energy absorption and conversion mentioned above will change greatly. In other words, when vibration energy is applied, in the case of material alone, the phase of the dipole itself shifts and energy is consumed to restore the original state to the original state, whereas dipole coupling consists of In the case of a vibration energy conversion compound, when vibration energy is applied, each dipole rotates around the coupling part and shifts in position. Will be consumed. As a result, coupled with the above-mentioned increase in the amount of dipole moment, it is thought that the energy absorption and conversion performance far exceeds the prediction here. As described above, the effects of increasing the amount of dipole moment, absorbing vibration energy, and dramatically improving conversion performance are due to the fact that the components constituting the material and the active component simply coexist. Instead, they are dipole-bonded to each other to form a “vibration energy conversion compound”, which occurs for the first time. Therefore, when selecting the components constituting the above-mentioned materials and the active component, the two are dipole-bonded to each other It is desirable to consider that they are easy to do. It is also important that both are placed in an environment (temperature, pressure, etc.) where dipole coupling easily occurs. The following are examples of vibration energy conversion compounds: The compounds represented by the following chemical formulas (1) to (4) are DCHB SA, PVC, CPE and PE, which are widely used as components of vibration damping and vibration damping materials. This is an example of a vibration energy conversion compound in which four active components, ECDPA, 2HPMMB, and DCHP, are dipole-bonded.

(Hereinafter the margin) ① (PVC—DCHBSA)

H H H H

H C H C H C H c H

s dipole coupling

I

c s c——

NSNS

② (PVC—ECDPA)

H H H H H H H H H H

C-1 C-1 C— C-1 C-1 C-1 C-1 C-1 C-1

= Dipole coupling ③ (PVC—2H PMMB)

= Dipole coupling ⑤ (CPE-DCHBSA)

H H H H H CI

c dipole coupling

⑥ (CPE—ECDPA)

H H H H H H H H H H

Dipole coupling 6 / size 00 OM

CQ

Π090 /

⑪ (P E— 2 H PMMB)

H H H H H H H H H H

-C-C-C-C-C-C-C-C-C-

H H H H

Dipole coupling

The anti-vibration material of the present invention includes, in addition to the above-mentioned vibration energy conversion compound, for the purpose of further improving the anti-vibration effect and anti-vibration effect, My scales, glass fragments, glass fibers, power fibers, Boilers such as calcium carbonate, barite, and precipitated barium sulfate can be included. The content of Buira one, preferably 20 to 80 weight ^_0/0. For example, the content of filler is 20 weight. If the ratio is less than / ₀ , filling the filler does not improve the performance sufficiently. Conversely, even if the filling amount of the filler exceeds 80% by weight, it cannot be actually contained. Or reduced mechanical strength may cause adverse effects. If necessary, additives such as antioxidants, reinforcing agents, reinforcing agents, antistatic agents, flame retardants, lubricants, foaming agents, and coloring agents may be added to the anti-vibration material. it can. The anti-vibration material of the present invention can be obtained by melting and mixing an active ingredient, a filler, an additive, etc., with the above-mentioned material components. In this case, a hot roll, a Banbury mixer, a twin-screw kneader, an extruder, etc. Conventionally known melt-mixing equipment can be used: Also, for the vibration countermeasure material, sheet-like, linear, granular, etc., considering the type of precision equipment to be applied and the size and shape of the application location, etc. However, the form can be set freely. When the vibration control material is a vibration damping material, the arrangement form of the vibration control material is as follows: when the vibration control material is a vibration damping material, a mechanical deck portion in the main body of the device, that is, a portion for fixing a drive source for running or rotating the recording medium; In addition to being attached to the frame or plate that constitutes the place where the vehicle runs or rotates, it is also attached to the inner surface of the casing of the equipment body, or to the chassis between the frame and the inner surface of the casing and casing. Can be. Incidentally, the damping material, the mechanical deck portion, Quai one single portion, or may be attached to all of the chassis part component, while _c can be attached to a portion in consideration of the performances material costs Ya request, When the vibration countermeasure material is an anti-vibration material, it is effective to attach it pointwise between the mechanical deck portion and the chassis portion and between the chassis portion and the casing portion. The attachment means may be a conventionally known fixing means such as an adhesive or an adhesive. Brief explanation of drawings Figure 1 is a schematic diagram showing dipoles in materials.

Figure 2 is a schematic diagram showing the state of the dipole in the material when vibration energy is applied.

FIG. 3 is a schematic diagram showing a dipole state in a material when components constituting the material and an active component are dipole-bonded.

Fig. 4 is a plan view showing the video camera chassis with vibration damping material (vibration countermeasure material) attached.

Figure 5 shows the measurement results of the vibration acceleration level at each frequency when the respective vibration damping materials (vibration countermeasure materials) of Example 1, Example 2, Comparative Example 1, and Comparative Example 2 were attached to the chassis. The graph shown.

FIG. 6 is a graph showing the dynamic elastic modulus measured for each of the vibration damping materials of Example 3, Comparative Examples 3 and 4.

Fig. 7 is a plan view showing a state where a vibration isolating material (vibration countermeasure material) is attached to the chassis side of the mechanical deck.

FIG. 8 is a graph showing the measurement results of the vibration acceleration level at each frequency when the respective vibration damping materials of Example 3, Comparative Examples 3 and 4 were attached to the chassis side of the mechanical deck. BEST MODE FOR CARRYING OUT THE INVENTION The following shows an example in which the present invention is applied to a video camera (TRV 900, manufactured by Sony Corporation). Example 1

To PVC 9 parts by weight, Mai force scale (Kurarai Tomaika, 3 OC, Ltd. Kuraray) 65.0 wt ^_0/0, DCHP 1 3. ⁰ parts by weight, in a proportion of DCHB SA1 3. 0 wt% Then, the mixture was put into a kneading roll set at 16 O ^c C and kneaded, and the obtained kneaded material was sandwiched between molds heated to 180 ° C and heated for 180 seconds. Thereafter, the sheet was pressed with a press at a pressure of 80 kg · f Zcm ² for 30 seconds to form a sheet, and a vibration-damping sheet having a thickness of 1 mm was obtained.

H

Example 2

A vibration-damping sheet was obtained in the same manner as in Example 1 except that the sheet was formed into a thickness of 3 mm. The structure of the polymer constituting each of the vibration-damping sheets of Examples 1 and 2 was analyzed. The vibration-damping sheets of Examples 1 and 2 contained PVC and DCHBSA represented by the following chemical formulas. It was confirmed that two kinds of vibration energy conversion compounds were included: dipole-bonded compound, PVC, DCHP and force; dipole-bonded compound.

① (PVC—DCHBSA)

H H H H

C

Child join ④ (PVC—DCHP)

H H H H H H H H H H

—

=. Dipole coupling

Comparative example

Commercially available vibration damping sheets made of PVC (Uleneine FD, manufactured by CISI Inc.) with a thickness of l mm (Comparative Example 1) and a thickness of 3 mm (Comparative Example 2) was prepared. As shown in FIG. 4, each of the vibration damping sheets of Examples 1 and 2 and Comparative Examples 1 and 2 was cut, and as shown in FIG. Attach to the part 21, the tape rotation points 22, 23, and the other three points 24, 25, 26 via adhesive tape. Next, the above chassis portion and a mechanical deck were assembled, placed on a foamed polyethylene sheet having a thickness of 20 mm, and the vibration acceleration level (dB) when the tape was run was measured. The results are shown in FIG. The vibration acceleration level (dB) was measured using a vibration pickup connected to a FFT analyzer (CF350, manufactured by Ono Sokki Co., Ltd.) via a sensor amplifier (PS-601, manufactured by Ono Sokki Co., Ltd.). A sensor (NP-601, manufactured by Ono Sokki Co., Ltd.) was attached to the chassis. For comparison, measurements were also made of a material without damping material (vibration countermeasure material) (unmeasured). Fig.5 When looking at the level at 160 Hz, the unmeasured one was 62.3 dB, while the one pasted with Comparative Example 1 was 59.7 dB. A decrease of 3 dB was confirmed, and the sheet to which the sheet of Comparative Example 2 having a thickness of three times was attached was further reduced to 58.5 dB, a further decrease of about 1 dB. On the other hand, in the case where the sheet of Example 1 was stuck, the decrease was about 9 dB, which is 53.2 dB. It was also confirmed that excellent vibration countermeasures of 51.8 dB were taken for Example 2 having a thickness of 3 mm. In addition, the inventor also confirmed the vibration countermeasure effect for each of the attaching portions 21 to 26 shown in Fig. 4, and found that the sheets of Example 1 or Example 2 were placed at the three places 21 to 23. Pasting was found to be the most effective. Example 3

Next, DCHB SA was blended at a ratio of 40 parts by weight with respect to 100 parts by weight of CPE (Eraslen 352 NA manufactured by Showa Denko KK), and this blend was formed into a sheet in the same manner as in Example 1 to obtain a sheet having a thickness of 1 mm. Was obtained. Analysis of the structure of the polymer constituting the obtained anti-vibration sheet revealed that the anti-vibration sheet contained a compound represented by the following chemical formula, in which CPE and DCHBS A were dipole-bonded. Was confirmed to be

(Hereinafter the margin) ⑤ (CPE-DCHB SA)

H H H H H

I I I I I

Spirit Dipole Bond The anti-vibration sheet according to Example 3 was cut into a size of 9 mm × 57 mm, and the dynamic viscoelasticity of this sample was measured. The measurement of the dynamic viscosities (tan S) was performed using a dynamic viscoelasticity measurement test device (Leo Vibron DDV-25FP, manufactured by Orientec Co., Ltd.). Fig. 6 shows the measurement results. For comparison, the dynamic viscoelasticity of the current product (Sorboscein, manufactured by Sanshin Kosan Co., Ltd.) and the commercial product (polybutadiene rubber) were measured in the same manner, and the results are shown in FIG. As shown in Fig. 6, the current and commercial products have peaks in the temperature range of 130 to 120 ° C, while the vibration-proof sheets of Example 3 have operating temperatures of 10 to 20 ° C. It was confirmed that a peak was present in the region. Next, the anti-vibration sheets of Example 3, the current product and the commercial product were cut into a size of 3 mm × 3 mm, and the anti-vibration sheets 31 were cut into the side of the chassis of the mechanical deck 30 shown in FIG. At each corner of the three places via adhesive: pasted ^; And this mechanical deck The key was assembled with the chassis, and this was put on a 2 Omm thick foamed polyethylene sheet, and the vibration acceleration level (dB) when the tape was run was measured. Figure 8 shows the results. The measurement of the vibration acceleration level (dB) was performed using the same device as in Example 1. Fig. 8 shows the vibration acceleration level (dB) at 160 Hz of each anti-vibration sheet. The current product is 62.3 dB and the commercial product is 61.9 dB. In contrast, the anti-vibration sheet of Example 3 was 60.4 dB.

Claims

Scope of word blue

1-In a precision instrument configured to run or rotate a recording medium such as a magnetic tape or a disk, a component constituting a material and an active component that increases an amount of dipole moment in the material are dipole-coupled. A precision device, characterized in that a vibration countermeasure material containing a vibration energy conversion compound is disposed inside the device main body.

2. The components that make up the material are polyvinyl chloride (PVC), polyethylene (PE), chlorinated polyethylene (CPE), polypropylene (PP), ethylene-vinyl acetate copolymer, polymethyl methacrylate, and polymethyl methacrylate. Vinylidene fluoride, polyisoprene, polystyrene (PS), styrene-butadiene-acrylonitrile copolymer (ABS), styrene-acrylonitrile copolymer (AS), acrylonitrile-butadiene rubber (NBR), acrylic rubber (ACR), One or more polymers selected from the group consisting of styrene-butadiene rubber (SBR), butadiene rubber (BR), natural rubber (NR), isoprene rubber (IR), and chloroprene rubber (CR) 2. The precision device according to claim 1, wherein:

3. The active ingredient is a compound having a benzothiazyl group, a compound having a benzotriazole group, a compound having a divinyl acrylate group, a compound having a benzophenone group, or a phthalate having a structure represented by the following chemical formula. 3. The precision instrument according to claim 1, wherein the precision instrument is at least one member selected from the group consisting of: Chemical formula

(In the formula, R is any one of a phenyl group, a cyclohexyl group, a cyclopentyl group, a cyclobenzyl group, a 4-methylcyclohexyl group, or any two of these groups.)

4. The precision device _{3 according} to any one of claims 1 to 3, wherein the vibration countermeasure material is a vibration damping material.

5. The precision device according to any one of claims 1 to 3, wherein the vibration-proof material is a vibration-proof material.

6. The precision device according to any one of claims 1 to 3, wherein the vibration countermeasure material is a vibration damping material and a vibration damping material.