JPH066379B2 - Positioning device for micro hole insertion - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a positioning device for microhole insertion, which is used when inserting a relatively hard needle-like insert into a thin microhole, and more particularly, The present invention relates to a positioning device for inserting micro holes, which is suitable for inserting small parts such as assembling a printer head.

[Prior Art] A conventional positioning device for micro-hole insertion is one in which an image of an insert is imaged by two cameras from two directions and positioned (fourth embodiment).
(Fig.), There is one that positions with higher mechanical accuracy when moving the insert, and there is also one that positions a microscopic hole by placing a camera on the insert side.

FIG. 4 is a schematic diagram when a camera is used in a positioning device for inserting a small hole in the related art.

When using two cameras 4-1, insert object 4-
2 and the insertion hole 4-3 were positioned at two locations other than the insertion direction 4-4.

There is also a method of using only one camera and positioning from the direction of the arrow in the figure, but in reality it was difficult because the depth of field was shallow.

[Problems to be Solved] The above-described conventional positioning device for inserting a small hole does not directly perform positioning between the small hole to be inserted and the insert, and therefore has the following problems.

In the case of a needle-shaped insert such as a printer head wire, it is difficult to mechanically obtain the positional accuracy of the tip.

When using two cameras, it becomes impossible to perform positioning when inserting a large number of wire rods into a small space due to the complexity. Therefore, it cannot be used for assembling a printer head or a small electronic device.

The present invention has been made in view of the above problems, and can be used even when inserting a large number of wire rods into a minute space, and positioning for minute hole insertion that enables insertion of small parts such as printer head assembly. The purpose is to provide a device.

[Means for Solving the Problems] In order to achieve the above object, the positioning device for inserting a small hole of the present invention has a light source that illuminates the tip of the insert and a pin that uses the small hole into which the insert is inserted as a pinhole. It is provided with a hall camera.

With this structure, the insert illuminated by the light source is imaged and positioned by the pinhole camera.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic cross-sectional view of a positioning device for inserting micro holes according to an embodiment of the present invention.

In the figure, reference numeral 1-1 denotes a solid-state image pickup device with a shutter function, which is a light-shielding plate 1 for closing the microscopic holes 1-9 other than the insertion target.
-2 is arranged behind to form a pinhole camera 1-3. In addition, 1-8 is a light source, which moves at the same time as the tip of the insert 1-7 moves to illuminate the tip.

As a result of using the principle of the pinhole camera in this way, when the hole to be inserted is very small, the position of the tip of the object to be inserted (tip image 1-4) with sufficient accuracy necessary for insertion. Can be imaged.

Further, since the depth of field 1-5 is deep, it is possible to trace the position of the tip all the time even during movement.

However, since the pinhole camera is dark, it is entirely surrounded by a light-shielding plate 1-6 (not shown) for the purpose of improving the S / N ratio. Further, 1-11 is a non-reflective cloth, which reduces disturbance.

The solid-state image sensor 1-1 with a shutter function is used because the pinhole camera does not have a light quantity adjusting function.

Next, FIG. 2 is a perspective view of a drive stage in the positioning device for inserting micro holes shown in FIG.

In this case, on the stage 2-1, a holder 2-3 of the wire 2-2 (biaxial fine adjustment control is possible), a spot light source (narrow laser slit light or halogen spot light source) 2-4, and All non-reflective cloths 2-5 are installed.

With such a configuration, it is possible to always irradiate the tip of the wire 2-2 with light.

The entire stage 2-1 is driven in the insertion direction by the X-axis table 2-6.

Then, when the X-axis table 2-6 moves forward, based on the principle shown in FIG. 1 (including the correction of the tilt), the image 1-4 at the tip by the pinhole camera is the solid-state image pickup device 1-.
It will move up 1.

This is summarized in FIG.

FIGS. 3A to 3D are schematic diagrams showing the relationship between the movement of the insert and the image position of the tip on the image sensor.

In the figure, 3-1 is a solid-state image sensor, 3-2 is a pinhole, 3-3 is movement of an insert, 3-4 is an image, and 3-
5 is an insert. Here, for simplification, the light shielding plate 1-2 and the minute holes 1-9 in FIG. 1 are collectively shown as a pinhole 3-2.

Further, the insertion target object 3-5 is 3-5 from the position of 3-5-1.
It is assumed that the image 3-4 moves to the position -2 and the image 3-4 at the tip moves from the position 3-4-1 to 3-4-2 correspondingly.

It should be noted that the peak position is detected by multi-level processing in order to obtain the accuracy of the image position, but the center position of the binary image is also sufficient if a sufficient S / N can be obtained.

In this case, the condition that the image can be inserted is that the image position 3-4 does not move even if the object to be inserted is moved in the arrow direction (3-3). Further, when there is a restriction on the inclination, it is possible to discriminate at the image position 3-4, as is clear by comparing FIGS. 3 (a) and 3 (b). The reference of the center 3-6 in FIG. 3 (a) can be measured by inserting a parallel laser beam from the front of the pinhole camera.

It can also be set by checking the insertion state in some cases.

[Effects of the Invention] As described above, according to the present invention, by forming a pinhole camera by the hole itself through which an insert is inserted, the depth of field is increased and the hole (= pinhole) to be directly inserted is inserted. It is possible to provide a positioning device for microscopic hole insertion, which can determine the positional relationship between the insert) and the insert, and can ensure reliable insertion.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a positioning device for microscopic hole insertion according to an embodiment of the present invention, and FIG. 2 is a perspective view of a drive stage in the positioning device for microscopic hole insertion of FIG. FIGS. 3 (a) to 3 (d) are schematic views showing the relationship between the movement of the insert and the image position of the tip on the image pickup device, and FIG. 4 shows the camera in the conventional positioning device for inserting micro holes. It is a schematic diagram when using. 1-1: Solid-state image sensor with shutter function 1-2: Light-shielding plate 1-3: Pinhole camera 1-7: Insert 1-8: Light source 1-10: Small hole for insertion 2-4: Spot light source 3- 1: Solid-state imaging device 3-2: Pinhole

Claims (4)

[Claims] 1. A light source for illuminating the tip of an insert, and a pinhole camera having a pinhole for a microscopic hole into which the insert is inserted, the pinhole for illuminating the insert illuminated by the light source. A positioning device for microscopic hole insertion, characterized by being imaged and positioned by a camera. 2. The positioning device for inserting a microscopic hole according to claim 1, wherein the pinhole camera has a light-shielding plate that closes holes other than the microscopic hole to be inserted. 3. The positioning device for microscopic hole insertion according to claim 1 or 2, wherein said pinhole camera uses a solid-state image pickup device with a variable shutter function for a light receiving portion. 4. The pinhole camera has a hole position fine adjustment means for finely adjusting the position of a fine hole to be inserted, and corrects and positions the fine adjustment. The positioning device for microscopic hole insertion according to any one of 1 to 3.