JPH07120377A - Testing apparatus for dust-durability of recording medium - Google Patents

Abstract

PURPOSE:To obtain testing surroundings which are optimum for evaluating the dust durability of a recording medium with good reproducibility. CONSTITUTION:The testing apparatus tests the dust durability of a recording medium in a testing room 10 in which a dust material is made to float artificially. In the testing apparatus, a mixed substance of the dust material and a liquid is atomized by an ultrasonic vibrator for an ultrasonic dust sprayer 30, it is sprayed in the testing room 10 whose humidity is low, and only dust particles are made to float inside the testing room 10 uniformly and gently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium dust durability tester used for evaluating the influence of dust on the durability of a recording medium.

[0002]

2. Description of the Related Art Conventionally, a dust test apparatus used for evaluating the influence of dust on the durability of a recording medium is mainly made for the purpose of testing the wear and durability of mechanical devices. For example, the test apparatus uses a method in which a large amount of test dust is blown up by a fan or a nozzle, or dust is circulated by a blower or the like.

[0003]

By the way, when the dust durability of the recording medium mainly used in the general environment is evaluated by the above-mentioned test apparatus, the test environment for the recording medium is too strict, so that the recording with different compositions is performed. Even in the medium
There is no significant difference in durability evaluation between these samples,
There was a problem such as destroying the storage device itself.

The present invention has been made in view of the above points, and a dust material is uniformly and uniformly suspended in a test space of a recording medium to provide an optimum test environment for evaluating dust durability of a recording medium with good reproducibility. It is an object of the present invention to provide a dust durability test apparatus for a recording medium that can be obtained.

[0005]

In order to achieve the above object, the invention according to claim 1 of the present invention is a test apparatus for performing a dust durability test of a recording medium in a test space in which a dust material is artificially suspended. Therefore, an ultrasonic dust spraying means is provided which atomizes a mixture of the dust material and the liquid by an ultrasonic vibrator and sprays the mixture onto the test space having low humidity. The invention according to claim 2 of the present invention further comprises a mixture supply means for uniformly stirring the dust material and the liquid and supplying the mixture to the ultrasonic vibrator of the ultrasonic dust scattering means.

[0006]

According to the first aspect of the present invention, the mixture of the dust material and the liquid is atomized by the ultrasonic vibrator of the ultrasonic dust spraying means and sprayed in the test space having low humidity, so that only the dust is in the test chamber. Therefore, it is possible to uniformly and gently float, and an optimum test environment for evaluating the dust durability of the recording medium can be obtained. Further, in the invention of claim 2, since the dust material and the liquid are uniformly stirred by the mixture supply means and supplied to the ultrasonic vibrator, the dust can be uniformly suspended in the test space.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic configuration diagram of a dust durability test apparatus for a recording medium according to an embodiment of the present invention. 10 is a test chamber (test space) partitioned from the outside, and 20 is a test chamber 10.
A recording medium durability test device arranged via a mounting table 11 therein, 30 is an ultrasonic dust spreader installed in the test chamber 10, 40 is a computer for data recording, and 40 is a computer for data recording. The recording medium durability testing devices 20 are connected by a signal cable 41.

The recording medium durability test device 20 is a well-known test device. For example, in the case of a micro floppy disk (hereinafter abbreviated as MFD), a floppy disk drive is used as a control signal from a data recording computer 40. The rotation of the floppy disk drive and the change in motor torque are measured at regular intervals. This measurement result is transmitted to and recorded in the data recording computer 40 through the signal cable 41.

As shown in FIG. 2, the ultrasonic dust spreader 30 is installed in a housing 31, an ultrasonic vibrator 33 housed in an atomization chamber 32 provided in the housing 31, and a housing 31. Dust (dust material) 51 and water 52
And a stirrer 35 for stirring so that the dust 51 and the water 52 in the tank 34 are uniformly mixed. The mixture in the tank 34 is passed through a pipe 36 connected to the tank 34 and the ultrasonic transducer 3
The mixed gas of dust and water, which is supplied in a fixed amount onto the nozzle 3 and atomized by the ultrasonic transducer 33, is discharged into the test chamber 10 from the outlet 37 connected to the atomizing chamber 32.

Next, the operation of this embodiment configured as described above will be described. In FIG. 2, when the mixture of the dust 51 and the water 52, which is uniformly stirred and mixed by the stirrer 35, is dropped onto the ultrasonic transducer 33 through the pipe 36, the water droplets are mixed with the dust by the ultrasonic transducer 33. It becomes water vapor and is gently and uniformly sprayed from the outlet 37 into the test chamber 10. At this time, by lowering the humidity in the test chamber 10, water immediately evaporates, so that an environment in which only dust particles mixed or dissolved in water are gently suspended in the test chamber 10 can be generated. Therefore, by operating the recording medium durability test apparatus 20 in such a dust atmosphere, for example, changes in the output of the floppy disk drive and the motor torque are measured at regular intervals, and from this measurement result, the durability of the MFD in dust is measured. Observe gender differences.

As described above, in this embodiment, by using the ultrasonic dust spreader 30, the amount of dust discharged into the test chamber 10 can be controlled with high accuracy. Further, by lowering the humidity in the test chamber 10, the water immediately evaporates, and only the dust particles mixed or dissolved in water can be gently suspended in the test chamber 10.
By attaching a small amount of controlled dust to the storage medium, it is possible to easily realize an optimum environment for dust durability evaluation of the storage medium, which cannot be obtained by a conventional test apparatus.

FIG. 3 is a graph showing the results of an experiment using the test apparatus of this embodiment. Specifically, three types of MFDs having different compositions were used to compare the time until scratches were caused by dust. As is clear from FIG. 3, the scratch generation times of the samples A, B, and C corresponding to three types of MFDs having different compositions were 140 hours and 220 hours, respectively.
It was confirmed that there was a significant difference in the durability evaluation between the respective samples, which was the time of 300 hours.

Although the type of dust material used in the above-mentioned embodiment is stipulated by JIS, etc., the dust materials mainly used are Kanto loam and ordinary Portland cement. The average particle size of these dusts is generally 8 to 24.
It is about μ. Furthermore, in order to obtain dust with a small particle size, tap water is put in a tank 34, and when tap water is supplied from this tank 34 to the ultrasonic transducer 33, calcium and the like contained in the tap water is made into particles and the particle size is reduced. Very small particles of the order of 1 μ are obtained. Also, by changing the temperature of the test chamber 10 and the type of dust material mixed in, it is possible to simulate various environments.

Next, an application example of this embodiment will be described. (Application Example 1) A non-woven fabric called a liner material is attached to the inside of the MFD to wipe out dust that enters the MFD from the general environment. Therefore, by conducting an experiment on the wiping effect using the test apparatus of this embodiment, it becomes possible to collect quantitative data. (Application example 2) By controlling the ultrasonic dust spreader 30 by a computer, for example, a program for spraying for a fixed time can be created, or if a plurality of tanks are used, several kinds of dust materials can be continuously controlled and sprayed. can do.

[0015]

As described above, according to the present invention, the mixture of the dust material and the liquid is atomized by the ultrasonic vibrator of the ultrasonic dust spraying means and sprayed in the test space having low humidity. Therefore, only the dust can be uniformly and gently suspended in the test chamber, and the optimum test environment for the dust durability evaluation of the recording medium can be easily obtained. Further, according to the present invention, since the dust material and the liquid are uniformly agitated by the mixture supply means and supplied to the ultrasonic vibrator, it is possible to reliably generate a test environment in which the dust uniformly floats.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a dust durability test apparatus for a recording medium according to an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of an ultrasonic dust spreader in the present embodiment.

FIG. 3 is a graph showing a significant difference between samples according to the experimental results of this example.

[Explanation of symbols]

 10 Test Room (Test Space) 20 Recording Medium Durability Test Device 30 Ultrasonic Dust Disperser 33 Ultrasonic Transducer 34 Tank 35 Stirrer 40 Data Recording Computer

Claims (2)

[Claims] 1. A test apparatus for performing a dust endurance test of a recording medium in a test space in which a dust material is artificially suspended, wherein a mixture of the dust material and a liquid is atomized by an ultrasonic transducer to obtain humidity. Dust durability test apparatus for recording medium, comprising ultrasonic dust spraying means for spraying the test space having a low temperature. 2. The recording medium according to claim 1, further comprising a mixture supply means for uniformly agitating the dust material and the liquid and supplying the mixture to the ultrasonic vibrator of the ultrasonic dust scattering means. Dust durability tester for media.