JPH05107483A - Visual inspection device - Google Patents

Abstract

PURPOSE:To display an observed image of a body to be inspected on a monitor screen. CONSTITUTION:An image pick-up device 2 is stored in a tube body 1 in a side wall of which an window hole 4 for observing a body to be inspected is formed, and a reflection mirror 5 which reflects an image of the body to be inspected incident through the window hole 4 to a position opposed to the window hole 4 in the tube body 1 on an image pick-up device 2 so that it is provided with a clearance from the inner periphery surface of the tube body. Then a lighting device 7 is provided at the back of the reflection mirror 5 so that light is not incident directly onto the image pick-up device 2 and the body to be inspected.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a visual inspection device for visually inspecting a pipe hole or the like of a cooling pipe support plate of a condenser.

[0002]

2. Description of the Related Art Generally, as a device for directly visually inspecting a cooling pipe of a condenser or a pipe hole such as a pipe hole of a cooling pipe support plate, equipment shown in FIGS. 5 and 6 has been developed. ing.

That is, reference numeral 1 in FIGS.
Is a pipe of a visual inspection device having a smaller diameter than the pipe to be inspected, and an image capturing device 2 such as a CCD camera is housed and fixed in the pipe 1 through a case 3. The tube body 1 is provided on the image input side of the image capturing device 2, that is, on the front side.
Has a window hole 4 for observing the inner surface of the object to be inspected, and the image incident from the window hole 4 is reflected by the image capturing device 2 at a position facing the window hole 4. The reflecting mirror 5 is arranged so as to be inclined with respect to the image input axis of the image capturing device 2.

The reflector 5 is attached to a holder 6 fixed in the tube body 1, and lamps 7 for illumination are attached to the holder 6 on both sides of the reflector 5.

However, when inspecting the inner surface of the pipe or the like, when the pipe of the visual inspection device is inserted into the pipe of the inspection object, the inner surface of the inspection object is projected on the reflecting mirror 5 through the window hole 4 and its image is displayed. The image is reflected by the reflecting mirror 5 and photographed by the image photographing device 2. Therefore, by observing the image captured by the vapor image capturing device 2 by a video monitor or the like which is connected to the image capturing device 2 via the camera cable 8 and is externally installed, damage to the inner surface of the object to be inspected, etc. Can be detected.

[0006]

However, in such an apparatus, since the lamp 7 for illumination is directly illuminated by the illumination lamp 7 when the inner surface of the body to be inspected is inspected, the portion near the lamp becomes extremely bright. However, the difference in illuminance increases as it gets closer to the surrounding area. Therefore, when observing an image captured by the image capturing apparatus 2 on this surface with a video monitor or the like, a portion that is strongly illuminated causes halation, or the peripheral portion is dark because the illuminance distribution is large. There is a problem that the image becomes difficult to observe.

Further, in the above-mentioned conventional visual inspection apparatus, when the size of the apparatus is reduced so as to correspond to an object to be inspected having a small-diameter tube hole, it is necessary to prevent the observation field of view of the image photographing apparatus from being impaired. The light emitting parts of the lamps 7 arranged on both sides of the lamp are also photographed by the image photographing device 2. When this is observed by the monitor, if the light quantity of the light emitting parts is large, halation occurs and the object to be inspected. It becomes extremely difficult to visually inspect the image of. Moreover, since the lamps 7 are provided on both sides of the reflecting mirror 5, even if a small lamp is attached, a lamp holder, a fixing jig, etc. must be provided to mount the lamp around the mirror. It is difficult to miniaturize.

In view of the above points, an object of the present invention is to provide a visual inspection apparatus capable of easily displaying an observation screen of an object to be inspected on a monitor and reducing the diameter of the apparatus.

[0009]

SUMMARY OF THE INVENTION The present invention accommodates an image capturing device in a tube having a side wall provided with a window for observing an object to be inspected, and corresponds to the window in the tube. At the position, a reflecting mirror that reflects the image of the object to be inspected incident through the window hole to the image capturing device is provided so as to have a gap with the inner circumferential surface of the tube body, and the image capturing device and It is characterized in that an illuminating device is arranged so that light does not directly enter the object to be inspected.

[0010]

When the inspection object is inspected by the visual inspection device according to the present invention, the illumination light from the illumination device is diffusely reflected by the reflecting mirror and the inner surface of the tube surrounding the reflecting mirror, and the illumination light between the inner peripheral surface of the tube and the reflecting mirror. Indirect light leaks from the gap, and the leaked light illuminates the surface of the object to be inspected. Therefore, the illuminance distribution of the object to be inspected is uniformly illuminated without abrupt local change, and the image captured by the image capturing device and displayed on the monitor has uniform brightness and is easy to observe. Become. In addition, halation is prevented from occurring, and the diameter of the device can be reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. The same parts as those in FIGS. 4 and 5 are designated by the same reference numerals.

In FIGS. 1 and 2, an image capturing device 2 such as a CCD camera is housed and fixed via a case 3 in a tube body 1 having a diameter smaller than that of an object to be inspected which constitutes a visual inspection device. A window hole 4 for observing the inner surface of the object to be inspected is formed in the side wall of the tube body 1 on the front side of the image capturing device 2.
Are formed. At a position facing the window hole 4 in the tube body 1, a reflecting mirror 5 for reflecting the image of the inside surface of the inspected body observed through the window hole 4 to the image capturing device 2 is arranged via a holder 6. Has been done.

By the way, the reflecting mirror 5 is tilted with respect to the axis of the tube body 1 so as to reflect the image observed through the window hole 4 to the image photographing device 2 side as described above, and An annular gap 10 is formed on the inner peripheral surface of the body 1 (FIG. 3).

On the back surface side of the reflecting mirror 5, a lamp 7 for illumination is arranged within the projected area of the reflecting mirror 5 in the axial direction of the tubular body, and is supported by a holder 6. The lamp cable 11 for supplying power to the external lamp controller 1 passes through the groove 12 provided in the lower portion of the case 3 for holding the holder 6 and the image capturing device 2 and the external lamp controller 1
3 (FIGS. 3 and 4).

On the other hand, the camera cable 8 connected to the image pickup device 2 is led out from the end of the tube body 1 and connected to the camera controller 14. In the camera controller 14, the inner surface image of the object to be inspected received by the image capturing device 2 is converted and output as a video signal to the monitor 15, and the image is displayed on the monitor 15 by the output signal.

When inspecting the inner surface of the object to be inspected,
When the tube body 1 is inserted into the tube of the object to be inspected, the image of the inspection portion observed through the window hole 4 formed in the tube body 1 is incident on the image capturing device via the reflecting mirror 5, and the image is captured there. The displayed image is displayed on the monitor 15.

In this case, the light from the lamp 7 is diffusely reflected by the back surface of the reflecting mirror 5, the inner peripheral surface of the tube 1, etc.
Indirect light from the light source is emitted from the annular gap 10 and the window 4 to the outside, and illuminates the inner surface of the object to be inspected.
Is prevented from entering.

Therefore, the display inspection unit is not locally illuminated by strong light, and the illuminance does not suddenly change in the range of the visual field of the image capturing apparatus 2, so that halation occurs on the monitor 15. In addition, the brightness does not exceed the adjustable range, and an image that is extremely easy to see can be obtained.

Moreover, as shown in FIGS. 1 and 2, since the image capturing device 2, the reflecting mirror 5 and the lamp 7 are arranged on substantially the same axis, the restriction of reducing the diameter by the lamp and the reflecting mirror is removed. The diameter can be reduced to a size close to the diameter of the image capturing device 2.

Further, in order to enhance the indirect illumination, a reflecting plate may be provided at the end of the tube on the lamp side, or a blasted surface or the like may be used to enhance the reflection on the inner surface of the tube.

[0021]

As described above, according to the present invention, the inner surface of the object to be inspected is irradiated with only the indirect light, and the direct light is not incident on the object to be inspected and the image capturing apparatus, so that the inspection is displayed on the monitor. The image of the surface can be made extremely easy to observe. Moreover, the diameter of the entire device can be reduced by disposing the illumination device on the back surface side of the reflected light.

[Brief description of drawings]

FIG. 1 is a partially longitudinal side view of an embodiment of a visual inspection device of the present invention.

FIG. 2 is a plan view of the visual inspection device of the present invention.

FIG. 3 is a vertical sectional front view of the visual inspection device of the present invention.

FIG. 4 is an explanatory diagram of a system of the device of the present invention.

[Fig. 5] Partial vertical side view of the conventional visual inspection device.

FIG. 6 is a plan view of a conventional visual inspection device.

[Explanation of symbols]

 1 Tube 2 Image Capture Device 4 Window Hole 5 Reflector 6 Holder 7 Lamp 10 Annular Gap 11 Lamp Cable

Claims (1)

[Claims] 1. An image capturing device is housed in a tube body having a window hole for observing an object to be inspected in a side wall portion thereof, and is incident on the tube body at a position corresponding to the window hole. A reflecting mirror that reflects the image of the object to be inspected to the image capturing device is provided so as to have a gap with the inner peripheral surface of the tube, and the light directly enters the image capturing device and the object to be inspected on the back side of the reflecting mirror. A visual inspection device characterized in that a lighting device is arranged so as not to do so.