JP2007285985A - Method and device for inspecting coating state of adhesive or oil repellent film - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To precisely inspect the state of the adhesive or oil repellent film applied to the surface of an inspection target even if the matrix of the inspection target comprises a metal or resin having gloss in a case that the visible emission of the adhesive or oil repellent film irradiated with ultraviolet rays from a light source is detected by a CCD camera to inspect the coating state of the adhesive or the oil repellent film on the inspection target. <P>SOLUTION: A first filter 7, which permits ultraviolet rays to transmit but cuts off visible light, is attached to the light source 2 and a second filter 8, which cuts off ultraviolet rays but permits visible light to transmit, is attached to the camera 4. Herein, from a viewpoint of more enhancing inspection precision, the camera 4 is arranged at a position separated in an almost vertical direction with respect to the surface to be inspected of the inspection target 1 and a dichroic mirror 3a, which permits visible light to transmit and reflects ultraviolet rays, is arranged between the inspection target 1 and the camera 4 to make the irradiation direction of the inspection target 1 with ultraviolet rays and the optical axis of the camera 4 coaxial. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an application state inspection method and an application state inspection apparatus for an adhesive or an oil repellent film.

  In recent years, electronic devices have been remarkably reduced in size and weight. If the assembly and inspection of these small and light electronic devices is relied on visual inspection as in the past, the inspection accuracy will not be improved. As electronic devices become smaller and lighter, there is a movement to automate the assembly process, and the inspection process is being automated accordingly.

In order to improve the inspection accuracy and to automate the product inspection, for example, in Patent Document 1, an adhesive containing a fluorescent agent is used as an adhesive applied to the inspection object, and the inspection object is irradiated with ultraviolet rays. A technique has been proposed in which fluorescence emitted from an adhesive is detected by a detector such as a camera to inspect the application position and amount of the adhesive.
JP-A-5-331438

  However, when an adhesive is applied to the surface of an object to be inspected whose base material is made of a glossy metal or resin, the ultraviolet rays applied to the object to be inspected are irregularly reflected on the surface of the object to be inspected. As a result, some of the irregularly reflected ultraviolet rays may be detected by the detector together with the light emission from the adhesive, which may reduce the inspection accuracy of the adhesive application state. If an application abnormality such as an adhesive is missed, for example, in the case of a small motor such as a spindle motor, a serious problem may occur in product performance.

  The present invention has been made in view of such a conventional problem, and the object of the present invention is on the surface even if the base material is an object to be inspected made of a glossy metal or resin. An object of the present invention is to provide a method and an apparatus capable of accurately inspecting the state of an applied adhesive or oil repellent.

  According to the present invention, ultraviolet light from a light source is applied to an object to be inspected coated with an adhesive that emits visible light when irradiated with ultraviolet light, or an object to be inspected coated with an oil repellent containing a luminescent material that emits visible light when irradiated with ultraviolet light. Irradiating and detecting the visible light emission of the adhesive or oil repellent with a detection member, and inspecting the application state of the adhesive or oil repellent to the object to be inspected. A first filter that blocks light is attached to the light source, and a second filter that blocks ultraviolet light and transmits visible light is attached to the detection member to prevent visible light from being emitted from the light source, and the detection There is provided a coating state inspection method for an adhesive or an oil-repellent film, characterized in that ultraviolet rays are prevented from entering a member to improve inspection accuracy.

  As the adhesive, it is preferable to use at least one of an epoxy adhesive and an acrylic adhesive.

  Further, according to the present invention, a light source for irradiating ultraviolet rays onto an object to be inspected coated with an adhesive that emits light by ultraviolet irradiation, or an object to be inspected coated with an oil repellent containing a luminescent material that emits light by ultraviolet irradiation. A first filter attached to the light source that transmits ultraviolet rays and blocks visible light; a detection member that detects visible light emission of the adhesive or oil repellent; and blocks ultraviolet rays attached to the detection member. An application state inspection device is provided, comprising: a second filter that transmits visible light.

  Here, from the viewpoint of further improving the inspection accuracy, a detection member is arranged at a position substantially perpendicular to the surface to be inspected of the object to be inspected, and visible light is interposed between the object to be inspected and the detection member. It is preferable to dispose an optical member that transmits light and reflects ultraviolet light, and to dispose the light source so that the emitted ultraviolet light is reflected by the optical member and irradiates the object to be inspected. Alternatively, the configuration in which the arrangement of the detection member and the light source is reversed from that described above, that is, the light source is arranged at a position substantially perpendicular to the surface to be inspected of the object to be inspected. It is preferable that an optical member that transmits ultraviolet light and reflects visible light is disposed between them, and the detection member is disposed so that visible light reflected by the optical member is incident thereon.

  In the coating film state inspection method and the coating film state inspection apparatus of the present invention, a first filter that transmits ultraviolet light and blocks visible light is attached to a light source, and a second filter that blocks ultraviolet light and transmits visible light is used as a detection member. Mounting and preventing visible light from being emitted from the light source and preventing ultraviolet light from entering the detection member, it is possible to accurately detect the visible light emission of the adhesive or the oil repellent by the ultraviolet light by the detection member. . As a result, product inspection can be automated.

  When at least one of an epoxy-based adhesive and an acrylic-based adhesive is used as the adhesive, since light is emitted by ultraviolet rays without containing a fluorescent agent, convenience is improved.

  In the application state inspection apparatus of the present invention, the detection member is disposed at a position substantially perpendicular to the surface to be inspected of the object to be inspected, and visible light is transmitted between the object to be inspected and the detection member. When an optical member that transmits and reflects ultraviolet light is disposed, and the light source is disposed such that the emitted ultraviolet light is reflected by the optical member and irradiates the inspection object, the irradiation direction and detection of the ultraviolet light on the inspection object are detected. Since the optical axis of the member is on the same axis, even if there is unevenness on the surface to be inspected, there is no shadow due to the unevenness, and the inspection accuracy can be further improved. Even if the arrangement of the detection member and the light source is reversed, the inspection accuracy can be further improved.

  Hereinafter, a coating film inspection method and a coating film inspection apparatus according to the present invention will be described with reference to the drawings. The present invention is not limited to these embodiments.

  FIG. 1 shows an embodiment of a coating film inspection apparatus according to the present invention. The coating film inspection apparatus in FIG. 1 includes a mounting table 5 on which an inspection target object 1 is placed in a box-shaped case 6 having an opening on the lower surface, and an inspection target object 1 arranged vertically above the mounting table 5. A CCD camera (detection member, hereinafter referred to as “camera”) 4 that receives visible light, and a dichroic mirror (optical member) that is disposed between the mounting table 5 and the camera 4 and reflects ultraviolet light and transmits visible light. 3a and the dichroic mirror 3a and the light source 2 which emits the light which contains the ultraviolet-ray or an ultraviolet-ray arrange | positioned on the substantially the same horizontal surface. The light source 2 is provided with a first filter 7 that transmits ultraviolet light and blocks visible light, and the camera 4 is mounted with a second filter 8 that blocks ultraviolet light and transmits visible light. The box-like case 6 prevents external light from entering the inside.

  In the coating film inspection apparatus having such a configuration, only the ultraviolet rays are emitted from the light source 2 by the first filter 7 that transmits ultraviolet rays and blocks visible light. In general, even a light source that emits ultraviolet rays called “black light” inevitably includes a visible light region, but the inspection apparatus of the present invention transmits the light shown in FIG. Since the first filter 7 having a rate is attached to the light source 2, visible light emitted from the light source 2 is blocked by the first filter 7 and only ultraviolet rays are emitted. The ultraviolet light emitted from the light source 2 in the horizontal direction is reflected by the dichroic mirror 3a inclined at 45 degrees with respect to the traveling direction of the ultraviolet light, proceeds downward, and the inspection object 1 placed on the mounting table 5 is inspected. It hits. The dichroic mirror 3a used here reflects ultraviolet rays and transmits visible light.

  The inspection object 1 is coated with an adhesive that emits visible light when irradiated with ultraviolet rays or an oil repellent (not shown) containing a light-emitting substance that emits visible light when irradiated with ultraviolet rays. When the test object 1 is irradiated with ultraviolet rays, these adhesives or oil repellents emit visible light.

  Examples of adhesives that emit visible light when irradiated with ultraviolet rays include epoxy adhesives and acrylic adhesives. Of course, there is no particular limitation as long as it emits visible light when irradiated with ultraviolet rays. Moreover, a conventionally well-known thing can be used as a luminescent substance contained in an oil repellent. For example, fluorescent dyes such as sodium fluorescein (uranin), bis (triacylaminostilbene) disulfonic acid derivatives, coumarin disulfonic acid derivatives or bistilbiphenyl derivatives; uranin, eosin, diaminotilbene, thioflavin T, rhodamine B, international orange Organic fluorescent pigments: Calcium tungstate, lead-containing barium silicate, europium-containing strontium phosphate, europium-containing yttria, cerium-containing yttria, copper or silver, tin, manganese, arsenic, aluminum, cadmium, one or more zinc sulfide, manganese-containing Magnesium gallate, magnesium fluoride, calcium fluoride, oxygen deficient zinc oxide, europium-containing zinc oxide, cerium-containing zinc oxide, cesium-containing Zinc, manganese or arsenic-containing zinc silicate, bismuth-containing zinc sulfide cadmium, and inorganic fluorescent pigments such as bismuth-containing calcium sulfide, strontium. The content of the luminescent substance in the oil repellent is not particularly limited, but is preferably in the range of 0.001 to 1.0% by weight.

  Part of the visible light emission of the adhesive and the oil repellent by ultraviolet irradiation proceeds upward, passes through the dichroic mirror 3a, and reaches the second filter 8. Since the second filter 8 blocks ultraviolet rays and transmits visible light, as shown in FIG. 3, ultraviolet light (peak wavelength 365 nm) emitted from the light source 2 and transmitted through the first filter 7 and an adhesive by ultraviolet light irradiation. Alternatively, of the visible light emission (peak wavelength 443 nm) of the oil repellent, only the visible light of the adhesive or the oil repellent is incident on the camera 4 and so-called noise light such as ultraviolet light is prevented from entering the camera 4. Thereby, the application position and application state of the adhesive and the oil repellent on the surface of the object to be inspected can be clearly recognized on the image.

  FIG. 4 shows a cross-sectional view of a hydrodynamic bearing device as an example of the object 1 to be inspected. The hydrodynamic bearing device of FIG. 4 is a so-called full-fill bearing device, in which the sleeve member 12 has a hollow cylindrical shape, and groove portions 122 and 123 formed at the upper end portion and the lower portion have a larger diameter than the inner diameter of the hollow cylinder. And a fitting groove 124 having a larger diameter than the groove 123 is further formed at the lower end.

  On the other hand, the shaft member 11 includes a shaft portion 111 and a thrust plate portion 112 formed at the lower end of the shaft portion 111. The shaft portion 111 is inserted into the hollow portion of the sleeve member 12 until the thrust plate portion 112 of the shaft member 11 is fitted in the groove portion 123 of the sleeve member 12, and the thrust bush member 14 is fitted into the fitting groove portion 124 of the sleeve member 12. Thus, the lower opening of the sleeve member 12 is sealed.

  On the other hand, in the upper opening of the sleeve member 12, an annular seal member 15 fitted in the shaft portion 111 is mounted and fixed to the groove portion 122 so that the upper surface thereof and the upper end surface of the sleeve member 12 are flush with each other. Yes. A minute gap between the sleeve member 12, the thrust bush member 14, and the shaft member 11 is filled with lubricating oil (not shown).

  Two dynamic pressure generating grooves 121a and 121b are formed in the axially spaced positions on the inner peripheral surface of the hollow portion of the sleeve member 12, whereby a pair of radial bearing portions are formed between the sleeve member 12 and the shaft member 11. ing. A dynamic pressure generating groove 121c is also formed on the bottom surface of the groove portion 123 of the sleeve member 12. The dynamic pressure generating groove 121c, the dynamic pressure generating groove 141 formed in the thrust bush member 14, and the thrust plate of the shaft member 11 are formed. A pair of thrust bearing portions is formed between the portions 112.

  In the dynamic pressure bearing device having such a configuration, when the shaft member 11 rotates, the lubricating oil (not shown) held in the minute gap between the sleeve member 12, the thrust bush member 14 and the shaft member 11 generates dynamic pressure. Pressed along the groove pattern of the grooves 121a, 121b, 121c, and 141, a local high-pressure portion is generated in the lubricating oil, and the radial load of the shaft member 11 is supported in the pair of radial bearing portions. The thrust bearing portion supports the load in the thrust direction of the shaft member 11.

  In this dynamic pressure bearing device, the sealing of the lubricating oil is performed by the taper seal portion 13 constituted by the annular seal member 15 and the shaft portion taper surface 117. The taper seal portion 13 is coated with an oil repellent to form an oil repellent film in order to prevent the lubricating oil from leaking out due to centrifugal force generated by rotation. The oleophobic agent contains a luminescent material, and the application state of the oleophobic agent can be image-recognized by using the inspection apparatus shown in FIG. For example, when the oil repellant is well applied to the outer peripheral surface of the shaft member 11, the camera 4 disposed above the fluid dynamic bearing device 1 is coated with the oil repellant as shown in FIG. The part that appears is a band-like light emission circle. On the other hand, when the application state of the oil repellent is poor, for example, a part of the belt-like circle is thinned or chipped. Further, even when an oil repellent is applied to a portion other than necessary, it can be recognized from the image of the camera 4.

  4, after the thrust bush member 14 is fitted into the fitting groove 124 of the sleeve member 12, the fitting portion is further sealed with a thermosetting epoxy adhesive B. The application state of the adhesive B to the fitting portion can be recognized by using the inspection apparatus shown in FIG. Specifically, the dynamic pressure bearing device 1 of FIG. 4 is placed upside down on the mounting table so that the thrust bushing member 14 is on the upper surface, and the application state of the adhesive B is irradiated with ultraviolet rays to the camera 4. Observe at. As in the case of the above-described oil repellent, when the application state of the adhesive B is good, a belt-like light emitting circle is displayed on the screen, while when the adhesive B is poorly applied, a part of the belt-like circle is displayed. Is thin or missing. As described above, according to the inspection apparatus of the present invention, the noise light incident on the camera 4 is reliably prevented, and the application position and application state of the adhesive and the oil repellent on the surface of the inspection object are clearly displayed on the image. Can be recognized.

  FIG. 6 shows another embodiment of the inspection apparatus according to the present invention. 6 differs from the inspection apparatus shown in FIG. 1 in that the arrangement of the camera 4 and the light source 2 is reversed. That is, in the inspection apparatus of FIG. 6, the light source 2 is disposed vertically above the mounting table 5, and the dichroic mirror 3 b is disposed between the mounting table 5 and the light source 2. And the camera 4 is arrange | positioned on the substantially the same horizontal surface as the dichroic mirror 3b. Similarly to the previous embodiment, the light source 2 is provided with a first filter 7 that transmits ultraviolet light and blocks visible light, and the camera 4 is mounted with a second filter 8 that blocks ultraviolet light and transmits visible light. It has been.

  In the coating film inspection apparatus having such a configuration, only the ultraviolet rays are emitted from the light source 2 by the first filter 7 that transmits ultraviolet rays and blocks visible light. The ultraviolet rays emitted downward from the light source 2 pass through the dichroic mirror 3 b and travel further downward, and irradiate the object 1 to be inspected placed on the mounting table 5. Note that the dichroic mirror 3b used here is different from the dichroic mirror 3b described above and transmits ultraviolet light and reflects visible light. When the inspection object 1 is irradiated with ultraviolet light, an adhesive or an oil repellent (not shown) applied on the inspection object 1 emits visible light.

  Part of the visible light emission of the adhesive and the oil repellent by ultraviolet irradiation proceeds upward, is reflected by the dichroic mirror 3b, and reaches the second filter 8. Since the second filter 8 blocks ultraviolet rays and transmits visible light, only visible light is incident on the camera 4 and so-called noise light is prevented from entering the camera 4. Thereby, similarly to the above-described embodiment, the application position and application state of the adhesive or the oil repellent on the surface of the object to be inspected can be clearly recognized on the image.

  FIG. 7 shows still another embodiment of the inspection apparatus according to the present invention. In the two embodiments described above, so-called coaxial epi-illumination in which the ultraviolet irradiation direction on the inspection object 1 is coaxial with the optical axis of the camera 4, the inspection apparatus of FIG. The direction is different from the optical axis. That is, the camera 4 is disposed vertically above the mounting table 5, the light source 2 is disposed obliquely above the mounting table 5, and ultraviolet light is irradiated obliquely from above the object 1 to be inspected. The visible light emission of the adhesive or oil repellent applied on the surface is photographed by the camera 4 vertically above the object 1 to be inspected.

  In the inspection apparatus having such a configuration, since the irradiation path of the ultraviolet rays from the light source 2 and the optical axis of the camera 4 are different, a dichroic mirror for separating the ultraviolet rays from the visible light becomes unnecessary. On the other hand, since ultraviolet rays are irradiated from an oblique direction, if there are irregularities on the surface to be inspected 1, a shadow is formed and an inspection blind spot occurs. Therefore, it is recommended to use the inspection apparatus shown in the two embodiments, which are coaxial epi-illumination, particularly when the surface to be inspected 1 has irregularities.

It is an outline figure showing an example of the inspection method and inspection device concerning the present invention. It is a figure which shows the transmittance | permeability curve of a 1st filter. It is a figure which shows the transmittance | permeability curve of a 2nd filter. It is an example of a vertical sectional view of a fluid dynamic bearing device as an example of an object to be inspected. It is an example of a camera image when the dynamic pressure bearing apparatus of FIG. 4 is inspected by the inspection apparatus of FIG. It is an outline figure showing other examples of the inspection method and inspection device concerning the present invention. It is an outline figure showing other examples of the inspection method and inspection device concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Target object 2 Light source 3a, 3b Dichroic mirror 4 Camera (detection member)
5 Mounting Table 6 Box-shaped Case 7 First Filter 8 Second Filter 13 Tapered Seal Part

Claims (5)

An object to be inspected coated with an adhesive that emits visible light when irradiated with ultraviolet light or an object to be tested coated with an oil repellent containing a luminescent material that emits visible light when irradiated with ultraviolet light is irradiated with ultraviolet light from a light source, and the above-mentioned adhesion is performed. A method of detecting visible light emission of an agent or an oil repellent agent with a detection member and inspecting an application state of the adhesive or the oil repellent agent on an inspection object,
A first filter that transmits ultraviolet light and blocks visible light is attached to the light source, and a second filter that blocks ultraviolet light and transmits visible light is attached to the detection member to prevent visible light from being emitted from the light source. And a method for inspecting the application state of the adhesive or oil repellent film, wherein ultraviolet rays are prevented from entering the detection member to improve inspection accuracy.   The coating state inspection method according to claim 1, wherein the adhesive is at least one of an epoxy adhesive and an acrylic adhesive.   A light source that irradiates ultraviolet light onto an object to be inspected that is coated with an adhesive that emits visible light when irradiated with ultraviolet light, or an object that is coated with an oil repellent containing a luminescent material that emits light that is visible when irradiated with ultraviolet light. A first filter that transmits ultraviolet light and blocks visible light; a detection member that detects visible light emission of the adhesive or the oil repellent; and a first filter that blocks ultraviolet light attached to the detection member and transmits visible light. An application state inspection apparatus comprising two filters.   An optical member that arranges the detection member at a position separated in a direction substantially perpendicular to the surface to be inspected of the object to be inspected, and transmits visible light and reflects ultraviolet light between the object to be inspected and the detection member. The coating film state inspection apparatus according to claim 3, wherein the light source is disposed such that the emitted ultraviolet light is reflected by the optical member and irradiated to the object to be inspected.   The light source is disposed at a position substantially perpendicular to the surface to be inspected of the inspection object, and an optical member that transmits ultraviolet light and reflects visible light is disposed between the inspection object and the light source. The coating film state inspection apparatus according to claim 3, wherein the detection member is arranged so that visible light reflected by the optical member is incident thereon.

Images