TW200401108A - Friction measuring method for non-contact type recording media, and friction measuring device for non-contact type recording media - Google Patents

Abstract

In the inventive friction property measuring method for non-contact type recording media, a pulling force (F) generated by a ball (13) is detected when the ball (13) contacts the surface of recording media (1) with a predetermined load to make the recording media (1) and ball (13) slide with a predetermined relative velocity. When measuring the friction feature of the surface of the recording media (1), a ball (13) formed by plastics is employed to measure. Accordingly, the friction feature of the surface of the recording media (1) can be accurately measure with a low cost.

Description

200401108 V. Description of the invention (]) [Technical field to which the invention belongs] Friction: It is a method for measuring the friction characteristics of Yukang II, +, and contact recording media on the surface of non-contact recording media. And a thick rubbing characteristic measuring device for a non-contact recording medium used in a body rubbing characteristic measuring method. [Prior art] Recording media (CD-DA, CD-ROM, CD-R DVD (DVD-ROM, DVD-R) for recording large-capacity digital data. The following 'in the specification of this patent, there are And 'DVD-RW, this is called the self-recording read head according to the recording medium incident surface protective layer and sequentially stacked structure. The composition of the data layer system is self-transmitting, can write materials and self-transmitting is non-contact Readout or volume (CD-ROM, etc.) of drive data for fixed-type recording at a fixed distance, (translucent substrate), recording medium, which is a recordable medium that can be written in the recording medium for light, recording layer, and reflection The recording medium is in the data light and then the writing is detected according to the necessary medium, in which the light of the moving device is written. These are generally from the light reflection layer, the incident-prevention surface side, the layer, the protective layer, and the reflection layer system. Light is reflected when recording is read. Recording materials have been used in recent years for various recordings recorded on the CD Dai (CD-RW), or various and DVD-RAM), and these items have been widely used as "recording media." These recording media are recorded on the surface of the media with only the laser light spaced apart. In reality, the playback-only recording medium side sequentially stacks light-transmitting layers. It also writes a recordable light-transmitting layer (transparent substrate). In this case, the playback-only recording layer ', compared to this, records data. Layer. Any kind of recording medium that irradiates the laser for playback on the side of the layer.

Page 5 2186-5728-PF (Nl); Ahddub, ptd 200401108 V. Description of the invention (2) The chemical state of the recording layer used for recording on the optical layer side. However, these recording or recording layers are concentrated into two layers. When it is exposed to light, it may cause scratches on the wrong side of the reading. Sometimes it is a fingerprint. In addition, because the surface of the high recording medium with the optical pickup is short, and the optical pickup is raised, sometimes the hard coating on the surface of the recording medium is made to a certain extent. In addition, the surface of the recording medium of the present invention is damaged. Now it is hard to reduce the hard coating surface and manufacture this kind of hard ore reduction. Correctly measure the hard ore layer and then correctly evaluate and record the non-contact method to implement the coating surface friction characteristics. Friction characteristics measurement method laser light 'by its thermal and / or light energy change. Physical state. In order to read or write normally, the media must have a spot of laser light of the read head on the reflective layer with a fixed diameter: a flaw on the surface of the layer cannot form a spot of positive pain or a writing error. In this case, the light-transmitting layer surface is generated by wiping off the dirt attached to the surface with a cloth or the like, and with the increase in the capacity of the recording medium in recent years, the numerical aperture (NA) cannot be used, and the optical pickup head and the moving distance (Working distance—) The possibility that it is gradually coming into contact with the surface of a rotating recording medium is being touched. However, scratches caused by contact with other objects can be suppressed by providing the surface of the recording medium. Through various experiments, in order to effectively reduce the occurrence of marks, in addition to the method of increasing the hardness of the hard coating, the surface friction coefficient is also an effective method. However, in the recording medium of the layer surface friction coefficient, it is necessary to have the friction characteristics (friction force and / or friction coefficient) of the medium. However, this type of recording media data is read or written. Therefore, the measurement of i: has not been implemented in itself, and of course, there is no such standard. Here, "the present invention *" applies the measurement (evaluation of the fracture resistance by abrasion)

V. Description of the invention (3) The slope of the surface of the object '.rhflll's well-known rubbing characteristics (or bismuth, on (bal 1-〇n — dx) in 磾 κ 宗 护 罟 grasping C) The test method is to measure the J properties of the recording medium hard-coating table by using the Acer disc measuring device (appropriation, product-theta-the-meaning method, at y-ll ^). Next, in the method of ear-cushioning, as described above, ^ ΐ: === τ) as described above ^ Hard = point contact measurement pair ::::: consumption 1 # ^ Buy and add the load as much as possible to implement the set H so that, in order to set the ball to 娌 y ^ is called 弋. The concrete is very hard metal or pottery. * ^ In the method, the ball is formed as a measuring member and a certain load is added (-and 仫 Λ 4 sodium), and then the shoulder is for example Large load of more than 50 g) _ Yu Lun, +, 丄,: Funeral :: make the ball (or pin) point contact with the object to be measured = (; more: layer) 'In this state, record The media and the ball are continuously sliding at a relative speed of Λ. By detecting the pulling force generated by the ball, the friction characteristics of the surface of the media. / 、 丨 δδ 录 [Summary of the Invention] In order to determine the friction characteristics of the hard coating of a recording medium. The inventor implemented a well-known method of placing a ball on a disc (baU-on-diSC). As a result, they found the following Problems that must be improved. That is, the characteristics of the hard coating of the recording medium are determined, and the apricot # 〒 裕 网 ▲ 田 句 1 / / = the heart characteristics, and λ ’s well-known ball-on-dlsc In the measurement method, the ball that touches the recording surface is generally formed by a very hard metal or ceramic. As shown in the figure, it goes without saying that the hard coating layer without lubricant (same as A in the figure) contains a lubricant ( For example, a hard coating using a silicon-based lubricant (200401108 in the figure) (4) __ BJ:. == 500 seconds, it will be destroyed. The friction coefficient of the mother's early time will be changed. When measuring the friction characteristics of the coating, the surface of the media (that is, the hard and extended hard coating is damaged: at the end; the load imposed by the work on f, and the characteristics are based on the premise of applying a large load; Out of the day: Measurement: When the load is reduced, the noise is easy to meet again. When the difference between the coefficient of friction between the two objects is difficult to determine, it is difficult to measure the redesign and manufacturing as friction. For characteristic measurement: So, f is also taken into consideration: fixed device, but ☆, small The charge is equal to the premise that the gas production or group is immediately required to have high precision, "the clothes are placed, and the parts are subject. The device itself is expensive. The main purpose of the present invention is to understand—the surface of a recording medium. Friction characteristics, a 4 questions, and provide • "Monkey 9 9 ΐλ", -Jr friction characteristics of non-contact recording media and accurately measured-the main purpose is to provide a method that can be determined = this The invention of another non-contact recording medium: the surface of the recording medium rubs against the non-contact recording medium of the present invention. By setting the measurement member with a constant load: a characteristic measurement method, When the state of the recording medium and the surface of the recording medium are simultaneously determined, and the friction characteristics of the body surface sliding at a certain relative speed generated by the measuring member are detected, the measurement of the above-mentioned measurement is performed. Components for measuring media. The components are devices for measuring friction characteristics of non-media using plastic molding of the invention.

_ V. Description of the invention (5) It includes: a rotating maneuver; a measuring member applying mechanism for applying the structure when the aforementioned non-contact non-contact type recording slide, measuring the formation of the aforementioned measuring member on the non-contact type recording medium. The measurement structure and the use of a gold-cut non-contact type contact type recording medium table member. In addition, it is reduced to measure the non-contact type measuring member in this case. Compared with components, due to consumption, it can also absorb this, which can reduce the timeliness of the measurement and reduce the measured coefficient of friction. It is best to make the structure so that it can contact a certain negative recording recording medium. The friction piece is actually the friction of the forming recording medium applied to the noise production recording medium. Most precisely, it is to change the friction system of the rough member itself. The aforementioned phase to the aforementioned non-contact are applied to the aforementioned measuring medium by molding the aforementioned and the aforementioned measuring member. When the media's friction coefficient is measured by the measuring device, and when the cutting surface of the measuring member is very abrasive, it can measure the amount of component on the measuring member. Therefore, the friction of the surface of the body is good. The difference between the number of pulls generated when the polypropylene and the nylon are easily elastically deformed and the rough surface slides. The knotting medium transforms the surface of the recording medium at a certain speed; the component is used; and the measuring machine is rotated by the rotating mechanism. When the component generates a tensile force at a certain relative speed; among which, the method of measuring the properties and the non-medium, by using the plastic with the previous abrasion measurement equipment compared to the farm, because there is less, so there is sufficient time to measure the non-connection. The load of the sliding measurement does not need to have a small negative energy at low cost and accurate characteristics. It can be used for the measurement of plastic molding such as thin or polyethylene processing, so the vibration generated by the grinding can be slowly milled, and the deviation can be borrowed. Therefore, as a result, the friction can be accurately discriminated. The speed is set within the range of 0.1 to 10 m / sec.

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Value. With this, it is possible to make the wear amount of the non-contact recording medium to a proper amount after a long period of M = 1: "Measure the surface over a long period of time and accurately measure the friction of the non-contact recording medium ::, ......" 内 之-定 *. With this, it is set to 250mg ~ 5 ° 〇g in the range of 4 denier π s _ This makes the wear amount of the non-contact recording medium more permanent ^ Γ τ έ a: b ί Over a long time measurement of the surface friction characteristics, as a result, can 0 丨 Measure the friction characteristics of non-contact recording media.

Furthermore, this disclosure is related to the subject matter contained in Japanese Patent Application No. 20G2-1 923 1 8 on the date of filing a patent application on July 1, 2002, and all of these disclosure months are expressly combined here as reference matters. [Embodiment] Hereinafter, with reference to the drawings, a description will be given of a preferred embodiment of a method for measuring friction characteristics of a non-contact recording medium of the present invention and a device for measuring friction characteristics of a non-contact recording medium. First, the configuration of a non-contact type recording medium (recording medium) 1 as a measurement object will be described with reference to FIG. The recording medium 1 is a disc-shaped optical recording medium. As shown in FIG. 1, the recording medium 1 includes a hard mineral layer 2, a light-transmitting layer 3, a recording layer 4, a reflective layer 5, and a substrate 6, and its structure can write data. In this case, although the material of each layer and the substrate 6 is not particularly limited, the hard key layer 2 and the light-transmitting layer 3 are each formed of, for example, an ultraviolet curable resin. The recording layer 4 has, for example, a multilayer structure in which a phase change of recorded data is sandwiched by an electromotive film. The reflective layer 5 is formed of, for example, an alloy containing silver as a main component. Substrate 6 is made of polycarbon

21S6-5728-PF (Nl); Ahddub.ptd Page 10 V. Description of the invention (7) Formation of acid ester. In the aforementioned S-recorded medium 1, as shown in FIG. 丨, the laser light emitted from the hard clock layer 2 side ^ ^ is written by the optical pickup (the data of layer 4 is not written or read from the recording layer 4) In the recording group 1, the surface on the hard plating layer 2 side is pulled by the recording medium, and as ^ Tian 丨 h is the target. The receiver's information about the non-contact recording medium, I Zhao loan noon, body use The measurement of friction characteristics is described with reference to Fig. 2. Then, the change is referred to as "measurement device friction characteristics measurement device (hereinafter, component glass η"), and the rotating mechanism 1 2 is used for measurement. Use the ball 13 of the structure, the holder 14, as the application ^ ifi. The structure of the stone i code 15 5, as the measuring mechanism of the device 16 and the measuring machine hibiscus >, +., BI —

Hi ® 1 1 Ground λ J J is a low-profile CPU 1 7_. The aforementioned measurement ^: the device made with the conventional friction characteristics measuring device, the difference between the known friction characteristics measuring device is the ball 13. In the shape, the rotation mechanism 12 includes: an electric motor core; and rotation I, in addition to having a structure capable of mounting the recording medium 1, is also rotated by the aforementioned electric motor 12a; its structure is capable of rotating at a predetermined speed The recording medium 1 is rotated. The ball 13 is formed of a plastic having a bending elasticity of 100 MPa to 2500 MPa. The second ball 13 is preferably formed of a plastic having a bending elasticity of 500 MPa to 2000 MPa. Such plastics include, for example, low-density polyethylene (for example, a flexural modulus of 200 MPa), high-density polyethylene (for example, a flexural modulus of 1,000 MPa), and polypropylene baking (for example, a flexural modulus of 1 400 MPa). In this embodiment, In the system, polypropylene is used to form the ball. The structure of the retainer 4 allows the ball 3 to be mounted on its lower end in a non-rotatable manner. In addition, the structure of the holder 4 is arranged vertically with respect to the rotation plane of the recording medium 1 so that the weight 15 placed on the upper end passes through the ball 丨 3 ′ in a direction orthogonal to the recording medium 1 (vertical square

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Page 11 200401108 V. Description of the invention (8) is applied to the recording medium, and the structure of the weight can be changed within the range of 25mg ~ 500g. The transducer 16 is associated with the holder 14. f In this case, the transducer 16 detects the pulling force generated at the ball 13 ^ At the same time, it also generates a digital asset showing the magnitude of the detected pulling force F to the CPIU7 cCPU17 based on the input digital data "instant / calculated ^ = The friction characteristics between the body 1 and the ball 3 (the friction force and / or the friction coefficient are the same as the coefficient of friction in her example). Furthermore, the cpui7 system will calculate the cumulative date from which the friction should be started. Time (elapsed time), the memory to the memory door is missing ψ Another, 'CPU1 7 series reads the friction coefficient and accumulated time from the memory, and then output to the display device or list device (not shown) (Illustration) == 'Refer to FIG. 2 to explain the method of measuring friction characteristics using the measuring device u. J: With the hard plating layer 2 facing upward, the recording medium i is horizontally loaded on f !! [The ball 13 is brought into contact with the surface of the hard plating layer 2 so that the lead is directly placed on the recording medium. Then, the weight 15 is placed on the device 14 and a load in the vertical direction is applied to the ball 3. In this case, the weight of the broken code 15 is set so that the load applied to the ball 13 is a certain value within the range of 25 mg to? 0 g. With this, the amount of wear of the recording medium can be set to :: J equivalent. Next, the electric motor 12a is operated to rotate the recording medium i in the direction of the arrow at a constant speed. For example, 'the electric motor is rotated at a constant speed to make the ball The relative speed between 13 and the recording medium 1 is a certain value in the range of 0.1 to 10 m / sec. In this case, by setting the rotation speed within the aforementioned range, the wear amount of the recording medium 1 can be set to an appropriate amount. As a result, the ball J 3 slides on the same circumference of the surface of the hard plating layer 2 of the recording medium 1. At this time, due to

The friction between the surface of the ball 13 # d body 1 (hard plating layer 2) is relative to the front: the circle Γ skin is pulled toward the rotation direction of the recording medium 1 (specifically, the continuous tangential direction). In addition, the cumulative time of the start of the operation of the transducer 16 is calculated by counting the electric motor 1 2a from «f, and real-time calculation of \ LJ ^ digital data output by i fn energy = 6„, known by the shell, self-memory Body read Mocha Biography Zhao; ^

The accumulated time can be measured and output to the display or list machine, etc., and the recording medium can be measured.] The friction coefficient of the hard key layer 2 is above the ball of the non-contact and non-contact recording members. It is preferable to measure the amount of hard coating to be applied to the ball 1 3 by bending the hard coating 2 of the body 1 made of metal balls continuously for the time. Therefore, the friction characteristics of the front surface can be obtained. [Example]

Method for measuring the friction characteristics of the recording medium in contact. In the friction characteristic measuring device, it is used as a measuring device for measuring the plastic shape of a plastic material with a curvature elasticity of 100 MPa to 250,000 MPa and a property ratio of 500 MPa to 2000 MPa. Compared with the component: ^ 疋, it can sufficiently lengthen the measurement time until the record is broken. Therefore, the friction coefficient of the surface can be changed. In addition, because the load is not reduced, it is possible to reduce the amount of noise produced by measuring the surface of the recording medium, that is, the hard plating layer and "α 果" can properly evaluate the recording medium j.

200401108

Fifth, description of the invention (10) Next, examples are given to explain the present invention in detail. _ First, in this embodiment, 'the recording medium 1 having a thickness of the hard plating layer 2 of 3.0 Mm is taken as a measurement object. During the measurement, the holders 14 are arranged so that the balls 1 3 come into contact with the positions 35 mm away from the center of the recording medium 1. As the weight 15, an article having a weight of 100 g was used. The rotation mechanism is set so that the rotation speed of the recording medium 1 is 120 rpm. That is, the relative speed between the ball 13 and the recording medium i is set to 0.44 m / sec. (First embodiment) The hard key layer 2 was prepared by adding 0.5% by weight of a silicon-based lubricant 1A and used as a recording medium 1. At the same time, a ball made of polypropylene was used. Measure the time-varying characteristics of the U friction coefficient of the recording medium || Λ Fork · (Second Example) A hard coating layer 2 was added without any lubricant! At the same time, the polypropylene medium was used to describe the method 'measured the friction coefficient of the recording medium 1 Β (,,,, the upper (third example) ... change... The hard plating layer 2 was added with 0.5% by weight of stone. Evening Code 1C is used as the recording medium 1, and at the same time, a ball 13 made of a Nimo / Theta agent recording medium (280 MPa) is used, and then the friction coefficient of the elasticity body 1C changes in time according to the above method. The recording medium 4 was measured. (Fourth embodiment) The hard plating layer 2 was made without adding any lubricant—the recording medium 1. At the same time, the " recorded medium 1D made of nylon was used as 13 '

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200401108

Method Fruit; Fruit. 'The friction of the recording medium 1D was measured. Figure 3 shows the recording medium 1 A, and Figure 4 shows the temporal change of the coefficient 1 C of the recording medium. 1 Measurement of each friction coefficient of B 1 Measurement of each friction coefficient of D Needless to say, it has 1 200 seconds and the ball is not fully maintained for more than 3 hours and 3 seconds. It can be known that 'when using a ball 13 made of polypropylene to measure, the recording medium u of hard plating layer 2 with added lubricant, even if the recording medium ΐβ of hard plating layer 2 with no lubricant added, passes through the gap' & No sharp decrease in the friction coefficient was observed as seen with the use of metal rhenium. Therefore, even if the measurement time 12 ′ has elapsed, each of the hard plating layers 2 of the recording medium U, 1B is said to be broken. Therefore, since the friction coefficient of the hard plated layer 2 can be measured, the measurement time can be accurately determined. Therefore, the friction result of the hard plated layer 2 can be appropriately measured, and the recording medium 1 can be accurately evaluated. In addition, it can be seen from FIG. 4 that when a ball 13 made of nylon is used to measure the recording medium 1 (: and the recording medium 1D having the hard mineral layer 2 without lubricant), Even after a period of 200 seconds, no sharp decrease in the friction coefficient was observed.

Even if a measurement time of 1,200 seconds or more has elapsed, it can be said that the hard plating layers 2 of the recording media 1c and 1D are not damaged. Therefore, even if a ball 13 made of nylon is used to measure the friction coefficient of the hard-plated layer 2, a sufficient measurement time can be maintained.

However, when using a ball made of polypropylene 13 and a nylon made of @ 球 1 3, as shown in Figure 4, 'One of the balls made of nylon 丨 3 has a large deviation in carcass friction coefficient'. So 'it is difficult to determine the time of the friction coefficient 200401108

丨 丨 Which ⅈ II I I V. Description of the Invention (12) The second nature change: Shell :. Also, when using a ball 13 made of nylon, especially in the field of measuring time (cumulative time) of more than 400 seconds, the friction coefficient of the hard shovel layer on the recording medium of the lubricant is 1 C, Recording media: The friction coefficient of D = θ, and the number added to k 1 is very close to each other, showing several characteristics of change. Therefore, it is difficult to discern the benefits of lubricants: the same: when the ball 13 made of polypropylene is used, h is _. In addition, the deviation of the rubbing coefficient is small, so it can be shown that the overall friction changes. The reason is: polypropylene = = time of friction coefficient κ Four Buddhas. · Koqu elastic modulus is smaller than Ni elastic modulus. Therefore, it is easy to elastically deform. Polyzine 13 series can wear slowly and can also. And ^^ = the resulting ball is long and thick, and the vibration caused when the surface is sliding, as a result, the measurement of the component is reduced. What's more, when polypropylene = t is used, the deviation of the tensile force is reduced. At 13:00, the ball cracked by J Ping, in the field where the main day of tiredness is very long, the hard plating layer 2 is added with the recording medium 1 of the lubricant and the hardening layer 2 and the lubricant time. Mining layer 2 is not added with 涧: M 啊 slip agent recording media 丨 B 麾 coefficients are very different, and it shows that they are not πα on each other! It is easy to determine the difference between lubricants. The reason is: Use: The coefficient of friction when thin is smaller than the coefficient of friction when using nylon to make it harder to wear, and as a result, it can be made longer; the surface of layer 2 can measure the friction Φ number of hard coating layer 2 t. In addition, the present invention is not limited to the μ, +. Shirt A 丄 | > The implementation mode of the invention of the above fans can be appropriately changed. For example, in the implementation form of the present invention, the measurement of the light transmission layer is formed by the thin film of the light, and the friction characteristics of the second, but the light incident surface side surface of the bow is used for this. To invent the method or device

2186-5728-PF (Nl); Ahddub.ptd Page 16 20041108 V. Description of the invention (13) The recording medium for measurement is not limited to this, as long as the recording / playback of shellfish is not accompanied by physical contact This type of non-contact recording medium can be measured for the light incident surface of various 4 recording media. In addition, although the friction characteristics have been described as examples in which the coefficient of friction has been measured: application, friction. In addition, instead of using ㈣5 to apply the ball 13 to the structure, it is possible to use a structure that applies a load to hold the weight of the holder 14 itself, and also to use a structure that applies a load to the weight of the ball 13 itself. [In the industry, as described above, there are very few components that can be continuously used. Therefore, the amount of components can be used. With this, the recording medium measurement method is set. The method can be used to realize the surface of the recording medium and the friction member of the recording medium by using a conventional device with a sufficient load to realize the surface of the gold media surface. Moreover, it can reduce the friction of the recording medium. Characteristics] Compared with the non-contact non-contact abrasion measurement made of plastics, the non-contact non-contact k-slip measurement is not necessary to be a non-contact recording medium with low friction characteristics. The measurement device 'is a member for fixing a recording-type recording medium. The load is measured and the friction characteristics of the non-contact type recording medium are measured. The friction characteristics of the cutting surface formed are applied to the friction characteristics of the non-contact type. 200401108

Fig. 1 is a diagram showing a constitution record. Fig. 2 is a diagram showing a constitution of a certain device (11) of the present invention. Sectional view of measuring medium (1). Friction characteristics for non-contact type recording media. The ball (13), which is a device for measuring friction characteristics (i), is made of polypropylene. The graph of the measured friction coefficient is shown in FIG. Fig. 4 is a graph showing the measurement result of the friction coefficient when the ball (13) of the friction characteristic measuring device (11) is a ball of a dragon suit. Fig. 5 is a graph showing the measurement result of the friction coefficient measured when the ball (] 3) of the friction characteristic measuring device (丨 丨) is a ball made of a system. "Explanation of symbols] 2 ~ hard plating layer; 4 ~ recording layer; 6 ~ substrate; 1 2 ~ rotating mechanism; 1 4 ~ holder; 16 ~ transducer; 1 2 a ~ electric motor; D f ~ digital data; 1 ~ non-contact recording medium; 3 ~ light-transmitting layer; 5 ~ reflective layer; 1 1 ~ friction characteristics measuring device; 1 3 ~ ball; 15 ~ stone de-code; 17 ~ CPU; 1 2b ~ rotary stage; 1A , 1 B, 1 c, 1 D to recording media

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Claims (1)

200401108 Six applications for patents ------- Lu NiΥ 丨 * A method for measuring the friction characteristics of non-contact recording media, with your # 1 疋 using components to ~ In a state where a fixed load contacts the surface of a recording medium, the friction between the medium and the measurement member sliding at the same surface at a certain relative speed; the friction generated by the Si component: tensile force, and the recording medium ^ T 'describes the measurement member system Plastic measuring foot measuring component. Among the above-mentioned measuring members of the non-contact recording medium described in item 1 of the friction 2 special range, the friction 3 formed by using ㈣㈣ or poly μ is used. The non-contact type-recording medium of 10 m / sec described in the first item. Within the range-'set its value. The aforementioned relative speed is set to 0.1 to the friction range; the non-contact type recording medium described in item 1 is within the range of 50 (^-the value is fixed, the aforementioned load is set to 2 5 0 峠 ~ including 5 · A friction characteristics measuring device for a non-contact recording medium is rotated to make the non-contact recording medium contact the aforementioned non-contact rotation with the measuring member; an applying mechanism for applying a certain surface of the recorded medium; Ning her sister, what is the mechanism for the general test. Wa ^ 疋 mechanism, the aforementioned non-contact type recording medium wire M and rotating 'when the aforementioned non-contact type recording medium month = the relative speed of the moving mechanism f slide, Determine the aforementioned measuring member with-force; 200401108 6. Scope of patent application Among them, the aforementioned measuring member is formed of plastic. 6. The friction characteristic measuring device for a non-contact recording medium according to item 5 of the scope of patent application, wherein the measuring member is formed by processing polypropylene or polyethylene. 7. The friction characteristic measuring device for a non-contact recording medium according to item 5 of the scope of patent application, wherein the rotation mechanism sets the relative speed to a certain value within a range of 0.1 to 10 m / sec, The non-contact recording medium is rotated. 8. The friction characteristic measuring device for a non-contact recording medium according to item 5 of the scope of patent application, wherein the aforementioned load applied by the aforementioned application mechanism is a certain value within a range of 250 mg to 500 g. 2186-5728-PF (Nl); Ahddub.ptd Page 20