JP3790454B2 - Inspection station for in-vehicle small camera - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an in-vehicle small camera inspection station.
[0002]
[Prior art]
As shown in FIG. 14 with reference numeral 60, the in-vehicle small camera is installed, for example, on the lower surface of the bumper 71 of the car 70, and images the surrounding landscape that becomes the blind spot of the driver and connects to it. The captured image content is displayed on the display device in the vehicle so that the driver can visually recognize it.
[0003]
In this small camera 60, a lens, a prism, an image pickup device, a printed circuit board, and the like for performing an image pickup function are mounted in a housing and sealed with a cap. FIG. 15 (a) shows a conventional example of the small camera 60, and shows the housing H and the cap C with the internal elements exposed. A printed circuit board 61 is disposed on the upper surface of the housing H, and the above-described imaging element 63, lens 64, and prism 65 are mounted in a case 62 fixed thereon. A cable 66 connected to the circuit board 61 extends from the side surface of the housing H. In addition, a sealing material 67 is attached to the periphery of the housing H to cover the cap C and seal it.
[0004]
(B) shows the state of the finished product 60 in which the cap C is put on the housing H, the screw 69 is passed through the screw insertion hole 68, and the screw is screwed into the screw hole on the cap C side. The cap C is made of resin, but the left and right inclined surfaces are light receiving windows Cw corresponding to the light receiving surfaces of the prism 65, and the portions are transparent.
[0005]
[Problems to be solved by the invention]
For the small camera 60 as described above, an optical inspection and an electrical inspection are performed before shipment. Among these, the optical inspection inspects the resolution and the image.
[0006]
In the inspection of the resolution, when the posture of the small camera 60 is determined as one, the viewing angle of each of the left and right light receiving windows Cw in each of the vertical and horizontal directions is maintained in that posture. Is to inspect.
[0007]
In the image inspection, color bleeding and color skip inspection and image distortion inspection are performed. In these image inspections, light projected from behind a translucent inspection plate formed of a transparent resin is applied to the light receiving window Cw of the camera 60, and the output content on the camera 60 side at that time is determined. A pattern corresponding to the above two inspection contents is formed on the inspection plate.
[0008]
That is, for inspection of color bleeding and color skip, the light that has passed through the inspection plate on which the rainbow-colored band pattern is formed is projected onto the light receiving window Cw of the camera 60, and is then sent to the monitor of the camera 60 at that time. The output is judged visually.
[0009]
In the inspection of image distortion, light that has passed through a transparent inspection plate on which a distortion inspection pattern is drawn is projected onto the light receiving window Cw of the camera 60, and the content of the output image to the monitor at that time Is determined visually.
[0010]
In the electrical inspection, white light is projected onto the light receiving window Cw of the camera 60, and the determination is made based on whether or not the output voltage value of the camera 60 at that time is within a predetermined voltage range at the normal state. If the output voltage is an abnormal value, it may be a defective product such as a short circuit in the wire of the wire harness connected to the camera. The above is an overview of optical inspection and electrical inspection. However, when these inspections are performed on the production line, there are the following problems.
[0011]
It is because when the inspection devices as described above are juxtaposed along the line, the line becomes very long and the occupied space increases, and the distance between the inspection devices increases. However, there is a problem that the number of manpowers for judging increases.
[0012]
Accordingly, an object of the present invention is to make the inspection station for performing the inspection as described above compact.
[0013]
[Means for Solving the Problems]
The present invention for solving the above problems is the construction of the inspection stations following configuration, the inspection station, have a gripping mechanism which it grips the small camera adapted to bicycles and has the inspection apparatus is disposed on a concentric circle of the rotation axis of the compact camera, by bicycles to grip the compact camera in the gripping mechanism, each of the left and right light receiving window each The inspection posture with respect to the inspection apparatus can be taken.
[0014]
In such an inspection station, conventionally, various inspection devices have linearly are arranged in parallel, placing the device on the degree equal to the intervals between adjacent circumferentially, about the inspection target camera, Ru is rotating it Therefore , the occupied space in the flow direction of the line becomes a fraction of the conventional one, and the height is almost the same, so if you incorporate it between the assembly area and the shipping area of the production line, you can make a more compact production line than before Can be built.
[0015]
At that time, the image inspection apparatus in the optical inspection is composed of a projector and an inspection plate attached thereto, and the inspection plate is a translucent plate, and the plate surface of the projector is disposed on the projector. If the inspection plate is mounted so as to be slidable in the direction perpendicular to the optical axis and along the plate surface, and divided into multiple types of inspection pattern screens along the sliding direction, the inspection plate is By simply sliding, a single projector can perform multiple inspections, making the inspection station compact.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. In this inspection station, the optical inspection and the electrical inspection described in the conventional example are performed. The optical inspection is a resolution inspection and an image inspection, and the contents thereof are as described above.
[0018]
1 to 3 schematically show the entire configuration of an inspection area for the inspection. 1 is a side view, FIG. 2 is a plan view, and FIG. 3 is a front view. FIG. 4 is an enlarged perspective view showing an arrangement of inspection devices in the inspection area.
[0019]
As shown in FIGS. 1 to 3, a gripping mechanism 10 in which a camera 60 as a workpiece is set is provided immediately before the worker M. Details of the gripping mechanism 10 are schematically shown in FIG. The gripping mechanism 10 grips the camera 60 and rotates it around a horizontal axis passing through a predetermined position of the camera 60 in the gripped state, that is, rotates the rotating shaft shown in FIG. As indicated by the alternate long and short dash line (labeled R), it is included in the symmetrical center plane of the left and right light receiving windows Cw and is a straight line parallel to the side edge of each light receiving window Cw.
[0020]
As shown in FIG. 5, the camera 60 is gripped by fitting the outer periphery of the camera 60 into the fitting groove 1a of the gripping plate 1 in which a part of the outer periphery of the camera 60 is punched to form the fitting groove 1a. Let's do it. In this embodiment, however, the naked camera 60 is not held, but the light shielding box 6 as shown in FIG. 6 is attached.
[0021]
As shown in FIG. 6, the light shielding box 6 is a box that is similar to the outer shape of the camera 60 and has a slightly larger size, is formed of an opaque resin, and corresponds to the light receiving window Cw of the camera 60. Only, the light receiving window 6a is opened and a filter is mounted. The reason why the light shielding box 6 is attached to the camera 60 is that the light entering the light receiving window Cw of the camera 60 from other than the light receiving window 6a of the light shielding box 6 is blocked and the camera 60 is placed in the dark room. This is because optical inspection is performed in the same environment. The reason why the optical inspection is performed in the dark room is to test whether weak light can be detected and to increase the accuracy of the inspection.
[0022]
The above is the gripping plate 1 of the gripping mechanism 10 and the manner in which the camera 60 is gripped by the gripping plate 1. The gripping plate 1 is further provided with the following inspection members. It is a plurality of light emitting diodes 2 (light emitting diodes, hereinafter simply referred to as LEDs 2) provided below the fitting groove 1a of the camera 60 with the holding plate 1 sandwiched in the thickness direction. This LED 2 performs “stray light inspection” to be described later.
[0023]
The gripping plate 1 as described above is rotated by the motor 3. The motor 3 and the gripping plate 1 are attached in such a manner that when the camera 60 is gripped (fitted) by the gripping plate 1, the motor spindle center 3 a (indicated by a one-dot chain line) overlaps the rotation axis of the camera 60. Thus, when the camera 60 is gripped by the gripping plate 1 and the motor 3 is operated, the camera 60 rotates around the rotation axis R. The spindle center 3a of the motor 3 faces the horizontal direction as shown in the figure.
[0024]
Then, as shown in FIG. 1, the rotation axis R of the camera 60 (the spindle center 3a of the motor) is set in such a gripping mechanism 10 so as to face directly above and directly below the camera 60 in the origin state. An image / electric inspection apparatus 20 that performs image inspection and electrical inspection is arranged on the circumference of a radius r (in this embodiment, r = 250 mm) indicated by a one-dot chain line. Further, a monitor 21 on which the inspection result is displayed is installed on an oblique side of the worker M (right hand in FIGS. 2 and 3).
[0025]
As shown in FIG. 7A, the image / electricity inspection apparatus 20 has an inspection plate 12 attached to the light projecting side of the projector 11, and the inspection plate 12 is as shown in FIG. 7B. In addition, the inspection content pattern described in the above-mentioned conventional example is formed on each of three inspection surfaces 12a, 12b, 12c obtained by dividing a rectangular transparent resin plate into three equal parts in the longitudinal direction.
[0026]
The three inspection surfaces 12a, 12b, and 12c are for inspecting the above-described color bleeding and color skipping, with the inspection surface 12a on the left side of the figure being a rainbow-colored pattern. In 12b, the inspection plate 12 is punched out to form a regular square opening, and white light from the projector 11 behind the opening is directly projected from the opening to perform the electrical inspection described above. Further, although not shown, a pattern for inspecting image distortion is formed on the right inspection surface 12c.
[0027]
The inspection plate 12 is attached to the projector 11 in the back so that its plate surface is perpendicular to the optical axis of the projector 11 and is slidable along the plate surface. Any one of the patterns of the three inspection surfaces 12a, 12b, and 12c can be accommodated. The inspection plate 12 is slid by a linear feed mechanism such as a ball screw (not shown).
[0029]
In addition to the inspection apparatus as described above, an inspection plate 13 for inspecting resolution is erected in front of the worker M. The inspection plate 13 is a square plate having a side length of 1000 mm, the center is set at a height of 1000 to 1100 mm from the ground, and the horizontal distance from the rotation position of the camera 60 is set to about 1000 mm. On the surface, scales indicating distances in the vertical direction and the horizontal direction are printed, and by this inspection plate 13, the viewing angle in each of the light receiving windows Cw in the vertical and horizontal directions is indicated. Inspect. The determination is made by visually observing the imaging content output to the monitor 21. If the camera 60 is assembled normally by setting the shape and dimensions as described above and the position where the camera 60 is rotated , the upper, lower, left and right edges of the inspection plate 13 can be captured. The dimensions are as follows. The above is the overall configuration of the inspection station. Next, the flow of inspection at the station will be described.
[0030]
First, the camera 60 in a state where the light shielding box 6 is mounted on the gripping plate 1 of the gripping mechanism 10 in the origin state shown in FIG. 8 is set. Then, in this state, one light receiving window Cw of the camera 60 is in a posture to undergo a resolution inspection. Therefore, as shown in FIG. 9, the one light receiving window Cw is subjected to a resolution inspection. The camera 60 is electrically connected to an analysis computer (not shown) via an electric wire connected thereto. In the inspection of the resolution, as described above, the extent to which the vicinity of the upper and lower edges and the left and right edges of the inspection plate 13 is captured is determined by looking at the scale of the inspection plate 13 displayed on the screen of the monitor 21. .
[0031]
Next, the camera 60 is rotated 90 ° in the clockwise direction in the drawing, and as shown in FIG. 10, the left and right light receiving windows Cw are brought to positions where they can take inspection postures for image inspection and electrical inspection. At this time, the image / electrical inspection apparatus is in such a posture that a vertical line standing at the diagonal center of each of the left and right light receiving windows Cw (regular square) coincides with the optical axis of the light projecting surface of the light projector 11 of the image / electrical inspection apparatus 20 20 is arranged.
[0032]
The inspection contents and method of the image / electrical inspection are as described above. When the inspection is completed, the camera 60 is further rotated 90 ° clockwise to the posture as shown in FIG. One light receiving window Cw is inspected with the above-described resolution.
[0033]
When the inspection of the resolution is completed, as shown in FIG. 12, the holding plate 1 is inverted 180 ° and returned to the origin position shown in FIG. 13, but the stray light inspection is performed during the 180 ° inversion. The stray light inspection detects the presence or absence of irregular reflection when light is projected onto the left and right light receiving windows Cw, and the light projection is performed by the LED 2 attached to the grip plate 1. The irregular reflection is detected visually through the output image of the monitor 21, and if irregular reflection is detected, the camera 60 may be a defective product such as a lens or prism being scratched. The camera 60 is taken out from the gripping plate 1 at the origin position shown in FIG. 13, and if the taken-out camera 60 is a non-defective product, it is sent to the next shipping area, and defective products are collected separately for each defective content.
[0034]
The above is the configuration of the inspection station according to the embodiment and the description of the operation thereof. In such an inspection station, since a plurality of inspection apparatuses are concentrated within the reach of one worker M, at least In terms of spatial workability, these inspections can be performed by one person, and after the inspection is completed, the finished product can be transferred to a nearby shipping area.
[0035]
【The invention's effect】
As described above, according to the present invention, since the inspection station can be constructed in a compact manner, there is an effect that it is possible to suppress the expansion of the occupied space of the entire line incorporating the inspection station and the number of workers. .
[Brief description of the drawings]
FIG. 1 is a schematic side view of an inspection station according to an embodiment.
FIG. 2 is a schematic plan view of an inspection station according to an embodiment.
FIG. 3 is a schematic front view of the inspection station according to the embodiment.
FIG. 4 is a diagram showing details of the arrangement of the inspection apparatus.
FIG. 5 is a detailed view of a gripping mechanism.
6A shows a light shielding box together with a camera, and FIG. 6B shows a state where the light shielding box is attached to the camera.
FIG. 7A shows the configuration of an image / electrical inspection apparatus, and FIG. 7B shows an inspection plate.
FIG. 8 schematically shows an origin state where a camera is set.
FIG. 9 schematically shows a state of inspection of a viewing angle in one light receiving window.
FIG. 10 schematically shows a state of optical inspection.
FIG. 11 schematically shows a state of inspection of a viewing angle in the other light receiving window.
FIG. 12 schematically shows the process of stray light inspection.
FIG. 13 shows a state where the camera is taken out after the inspection is completed.
FIG. 14 shows an example of a usage example of an in-vehicle small camera.
FIG. 15A shows components and caps in a housing of a small vehicle-mounted camera, and FIG. 15B shows a finished product.
[Explanation of symbols]
1 Grip plate 1a Fitting groove 2 LED
3 Motor 3a Motor spindle 6 Light shielding box 6a Light receiving window 10 of light shielding box Grasping mechanism 11 Light projector 12 Inspection plate 13 (for resolution / inspection) Inspection plate 20 Image / electricity inspection device 21 Monitor 60 Camera Cw Light receiving window (for camera)

Claims (2)

A light receiving window disposed symmetrically at a predetermined angle corresponding to the light receiving surface of the prism (65) in a housing (H) in which a lens (64), a prism (65), and an image sensor (63) are mounted. (Cw, Cw) when performing optical inspection resolution and image of the cap (C) automotive small camera comprising been covered is (60) having, it its own rolling is to grip the compact camera (60) A small-sized camera (60), and the resolution and image inspection devices (13, 20) are arranged on a concentric circle of a rotation axis of the small-sized camera (60). (60) by self-rolling by holding at the gripping mechanism (10), said left and right light receiving window (Cw, Cw) as can the test orientation for each inspection device each (13, 20) Inspection of small in-vehicle cameras Shon.   The image inspection apparatus (20) in the optical inspection includes a projector (11) and an inspection plate (12) attached thereto, and the inspection plate (12) is a translucent plate, and the projector For (11), the plate surface is perpendicular to the optical axis of the projector (11) and is slidable in the direction along the plate surface, and a plurality of types of inspections are performed along the slide direction. 2. The in-vehicle small camera inspection station according to claim 1, wherein the inspection station is divided into pattern screens.

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