JPH01150290A - Liner position detector for floppy disk - Google Patents

Abstract

PURPOSE:To accurately discriminate the fixing positions of liners with the same color or a similar color by using an ultraviolet lamp having a light emitting peak in an ultraviolet area of a prescribed range for a light source and photographing the peak with a camera for detecting ultraviolet rays in the prescribed range. CONSTITUTION:When the whole surface of a shell B is uniformly irradiated by the ultraviolet lamp 1 having the light emitting peak in the ultraviolet area with 300-410nm wavelength, ultraviolet rays formed as an image by a lens are photographed by the camera 2 provided with a photoelectric conversion element for converting the ultraviolet rays into an electric signal and an output signal from the camera 2 is transmitted to a processing means 3. Even if the color of the shell B is white equal to the color of the liner A in the ultraviolet area <=400nm wavelength, the shell B shows a low reflectance, the liner A can be clearly distinguished from the shell B and whether the liner A is fixed on the prescribed position of the shell B or not can be accurately decided.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an apparatus for testing whether a liner affixed to the shell of a floppy disk is in place.

[Conventional technology and its problems]

Floppy disks have a nonwoven liner attached to the inner surface of the shell. The liner allows the magnetic disk to rotate smoothly and also removes dust that adheres to the surface to prevent bit errors during use. By the way, the liner is made of a flexible nonwoven fabric made of extremely thin fibers so as not to damage the surface of the rotating magnetic disk when it comes into contact with the liner. A flexible liner deforms when being held and transported, making it difficult to accurately fix it to a fixed position on the shell, and the fixing position tends to shift. For this reason, all shells with liners attached are inspected to ensure that the liners are fixed in place. Tests are visually judged by people, so there is a lot of confusion. However, 1. When the shell and liner are of the same color or similar colors, it is difficult to determine the fixing position of the liner, resulting in considerable fatigue for the inspector, and there is a drawback that inspection defects are likely to occur. In order to eliminate this drawback, the present inventor developed a device that photographs the shell to which the liner is attached using a camera, processes the output of the camera using a microcomputer, and identifies the liner shell fixing position. When a white liner is attached to a relatively dark-colored shell, this device can accurately and automatically identify the position of the liner, and can significantly save labor in inspecting liner attachment. However, if the shell is the same color as the liner or a color close to this, it becomes difficult to distinguish between the liner and the shell. That is, the camera is equipped with an optical-to-electrical conversion element at the position where the image of the liner and shell is formed, and this converts the intensity of light into an electrical signal. In the case of color, the intensity of light is almost the same between the shell and the liner, and the output of the photo-electric conversion element is almost the same between the shell and the liner, making it difficult to distinguish between the shell and the liner. When the output signal levels of the light-to-electric conversion element become close to each other between the shell and the liner, malfunctions are likely to occur due to changes in the light intensity of the light source or the influence of external light, resulting in detection errors. Therefore, an identification device that uses a camera and a microcomputer has the disadvantage that when the shell is the same color as the liner or a similar color, inspection errors are more likely to occur than when an inspector visually inspects the liner. It has the disadvantage that it can only be used in shells.

[Object of this invention]

This invention was developed with the aim of eliminating these conventional drawbacks.An important objective of this invention is that the position of the white shell liner to which the white liner is fixed can be accurately detected, and the color of the shell can be accurately detected. To provide a floppy disk liner position detecting device capable of inspecting the liner fixing position of almost all shells regardless of the type of shell.

[Means to solve conventional problems]

The floppy disk liner position detection device of the present invention includes: a light source that irradiates light onto the shell of a floppy disk to which a liner is attached; a camera that photographs the shell and liner illuminated by the light source; and processing means for processing the output signal to identify the position of the liner relative to the shell. The light source is an ultraviolet lamp with an emission peak in the ultraviolet region of 300 to 410 nm. The camera detects ultraviolet rays of 300 to 410n+n, converts the detected ultraviolet rays into electrical signals, and inputs the output to the processing means.

[effect]

The spectral reflection characteristics of the liner and shell for ultraviolet and visible light having wavelengths of 200 to 500 nrR are shown in FIG. However, this reflection characteristic is measured as a relative value with the reflectance of calcium phosphate having a flat reflectance even in the ultraviolet region as 100. In FIG. 1, curve A shows the spectral reflection characteristics of a white shell, curve B a yellow shell, and curve C a gray shell. Also, in this figure, curves a, b, c, d
shows the spectral reflectance of typical liners currently used for floppy disk liners. ■ The liner of curve a is made of 100% acrylic nonwoven fabric, has a mass of 29 g/m2, and a coefficient of friction of 0. 34 (Mitsubishi Rayon VA250) ■ The curved liner is made of non-woven fabric of 75% rayon and 25% polypropylene, weighs 36g/m2, and has a friction coefficient of 0.38 (ENDALL 149-303).
). ■ The liner of curve C is made of non-woven fabric of 77.5% rayon and 22.5% polypropylene and weighs 31g/m2.
, the coefficient of friction is 0.38 (KENDALL 149
-027). ■ The liner of curve d is made of 80% rayon and 2 nylon.
Made of 0% non-woven fabric, weight 36g/m2, friction coefficient 0
．． 36 (KENDALL 149-246). As is clear from curves A, B, and C, shells with different colors have significantly different light reflectances in the visible light wavelength range of 400 nm or more; in other words,
Different colors appear due to differences in reflectance in this region, but advantageously, in the wavelength region below 400 nm, the shell exhibits extremely low reflectance regardless of its color. In other words, in the ultraviolet region of 400 nm or less, even if the shell color is white, which is exactly the same color as the liner, the reflectance of light in this region is significantly different, and the liner and shell can be clearly distinguished. can. In particular, as shown by curve A, the reflectance of the white shell is exactly equal to the reflectance of the liner in the visible wavelength range of 415 nm or more, making it almost impossible to distinguish between the liner and the shell.゛However, even though the liner and shell are the same white color and are extremely difficult to distinguish with the naked eye, the shell and liner are irradiated with ultraviolet rays with a wavelength of 300 to 410 nm, which have different reflectances. The contrast between the liner and shell is significantly increased by detecting the UV radiation reflected by the surface with a camera. Therefore, even if the shell is white, which is the same color as the liner, the electrical signal output from the camera can have a large output level difference between the shell and a part of the liner, and the processing means can clearly distinguish between the liner and the processing means. Therefore, the floppy disk liner position detecting device of the present invention can accurately inspect the liner fixing position of almost all shells, regardless of the color of the shell, and the liner fixing position of almost all shells can be accurately inspected. To save the labor of liner inspection, which is extremely time-consuming, to reduce the cost of manufacturing 1M floppy disks, and to achieve the great effect of extremely reducing the incidence of defective products.

[Preferred embodiment]

Hereinafter, one embodiment of the present invention will be described based on the drawings. However, the embodiments shown below are illustrative of a liner position detection device for embodying the technical idea of the present invention, and the liner position detection device of the present invention has various characteristics such as material, shape, structure, etc. of the component parts. The arrangement is not limited to the following structure. Various modifications may be made to the device of the present invention within the scope of the claims. Further, in this specification, numbers corresponding to the members shown in the embodiments are added to the members shown in the claims so that the claims are easy to understand. However, the members described in the claims are by no means limited to the members shown in the examples. The floppy disk liner position detection device shown in FIG. A camera 2 that takes a picture of
A processing means for processing the output signal of the camera 2 and identifying the position of the liner A with respect to the shell B is provided. Light [1] should be used with two lights on both sides of shell B, as close as possible to the surface of shell B, so as to uniformly illuminate the entire surface of shell B and not get in the way of camera 2 photographing shell B. It is located in This light source 1 has a wavelength of 300 to 4
An ultraviolet lamp having an emission peak in the 10 nm ultraviolet region is used. As the ultraviolet lamp, for example, as shown in FIG. 2, a black light fluorescent lamp having an emission peak in the range of 360 to 380 nm is most suitable. Depending on the type of liner, a fluorescent lamp for health line having an emission peak in the range of 320 to 350 nm can be used. The emission wavelength of ultraviolet lamps can be adjusted by adjusting the type of phosphor inside the lamp, which emits light when stimulated by ultraviolet light. Shell B, which is irradiated with ultraviolet light by an ultraviolet lamp, can improve contrast by blocking visible light from the outside. To achieve this, as shown in Figure 3, shell B, light source l, and camera 2 are covered with a cover made of a material that does not transmit visible light, and the ultraviolet rays reflected by shell B and liner A are transmitted to camera 2. To detect. In this way, the device that covers the light source 1 with the ultraviolet blocking cover can also realize the feature of preventing ultraviolet rays from leaking to the outside. However, if the light emission intensity of the light source 1 is stronger than the external light, it is not necessarily necessary to cover the shell B, the light source 1, and the camera 2 with a cover as shown in FIG. Camera 2 has a wavelength of 300 to 300, which is emitted from light source l.
A camera 2 capable of detecting 410 nn+ ultraviolet light is used. The camera 2 includes an optical-electrical conversion element that converts an ultraviolet image formed by a lens into an electrical signal. This optical-electrical conversion element can be any element that converts ultraviolet light with a wavelength of 300 to 410 nm into an electrical signal, such as a CCD type or Mos type optical-electrical conversion element, a vidicon, an image orthicon, etc. can. The MOS type optical-to-electric conversion element is composed of a photodiode array, a noise compensation diode play, and a shift register, and this element sequentially outputs a video signal one element at a time at the timing of a start pulse and a clock pulse. In the Mos type, the photodiode has a larger light-receiving area than the CCD type, and the sensitivity can be increased in proportion to the accumulation time and the light-receiving area. The CCD type is composed of a photodiode array, a transfer gate, a shift register, an output gate, and an output section, and the video signal is transferred by the shift register and sequentially output according to the timing of the trigger pulse. The output signal from camera 2 is transmitted to processing means 3, which identifies liner A and shell B and determines whether liner A is fixed in position on shell B. The processing means converts the analog signal manually input from the camera 2 into a digital signal using an A/D converter, inputs the digital signal to the microcomputer, and the microcomputer converts the shell B to the liner according to a predetermined procedure. Determine the position relative to. The calculation method by which the processing means 3 processes the human signal is, for example,
Shell B is placed at a precisely determined measurement position, and in this state, liner A is detected based on the difference in contrast, that is, the level difference of the input signal, and the outer periphery of liner A is located at the determined position. A method can be adopted to determine whether or not it exists. However, this invention does not specify a method for determining the position of the processing means relative to the shell B on the liner.
As the processing means, any processing means that processes electrical signals manually inputted from the camera 2 to determine the position of the liner A can be used.

[Brief explanation of the drawing]

Fig. 1 is a graph showing the spectral reflection characteristics of the synthetic resin shell and liner in the ultraviolet region, Fig. 2 is a graph showing the emission characteristics of light source I, and Fig. 3 is a floppy disk showing an embodiment of the present invention. FIG. 2 is a block diagram of a liner position detection device of FIG. A: Liner, B: Shell, 1: Light source, 2: Camera, 3: Processing means. Mikar3: f-(X) Figure 2 Figure 3

Claims (4)

[Claims] (1) A light source 1 that irradiates light onto the shell B of the floppy disk to which the liner A is attached; a camera 2 that photographs the shell B and the liner A that are irradiated by the light source 1;
In the liner position detecting device equipped with processing means for processing the output signal of the camera 2 to identify the position of the liner A with respect to the shell B, the light source 1 has a light source of 300 to 410 nm.
A floppy disk liner position detection device characterized in that the camera 2 is an ultraviolet lamp having an emission peak in the ultraviolet region of 300 to 410 nm and detects ultraviolet light in the range of 300 to 410 nm. (2) A floppy disk liner position detection device according to claim 1, wherein a black light is used as the light source 1. (3) The floppy disk liner position detection device according to claim 1, wherein the camera 2 includes a CCD type photo-electric conversion element. (4) The floppy disk liner position detecting device according to claim 1, wherein the camera 2 has a moss type optical-to-electrical conversion element.