JPH03262012A - Positioning device for fine hole - Google Patents

Abstract

PURPOSE:To accurately position the fine hole of a magnetic head, etc., at a high speed by detecting the relative positions of the fine hole and a wire insertion position by a fixed fine hole detecting means and correcting the positions. CONSTITUTION:The relative position of the fine hole detecting means 10 for correcting the position where a wire material 3 passes and the position of the fine hole 4 is fixed mechanically, the position correction quantity of the fine hole 4 is measured, and the center position of the fine hole 4 is set at the position where the wire material 3 passes. Consequently, the fine hole 4 can accurately be positioned at a high speed to improve the rate of winding success and securely thread the wire material even if a threading mechanism for the fine hole 4 shifts in position mechanically.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for positioning a microhole in a device for winding a wire around a wound body having a microhole, such as a magnetic head.

[Conventional technology]

For example, in the manufacturing process of a magnetic head, there is a step of winding a wire around a head chip portion of the magnetic head. As shown in FIG. 6, this magnetic head generally has a head chip 2 provided on a protrusion of a magnetic head 1, and a wire rod is wound around the head chip 2 several tens of times. head chip 2
A small square hole 4 with a negative side of several 100 μm is provided, and a wire 3 having a diameter of several 10 μm is passed through this square hole 4 and wound around the head chip portion 2 . A device for automatically winding the wire has been developed and a patent application has already been filed (for example, Japanese Patent Laid-Open No. 63-58.813).

FIG. 8 shows the overall configuration of this device, and the device is capable of fully automatic operations from supplying wire to winding. The basic configuration includes a wire supply section 30, an image processing section 31 that corrects the position of the microholes of the magnetic head before winding, a winding section 32 that winds the wire along a circumferential trajectory, and a magnetic head. It is composed of a core holder section 33 that holds the.

The winding procedure is shown in Figure 7. The starting end of the supplied wire 3 is fixed by the holder 27a, as shown in FIG. 3(A). Thereafter, the winding operation is repeated as shown in FIG. 10(B), and the terminal end portion is fixed to the holder 27b as shown in FIG. 10(C). In addition, the terminal line portion is temporarily fixed to the substrate pad 26 of the magnetic head 1 with an adhesive 29 supplied from an adhesive nozzle 28, as shown in FIGS. transported to.

In this winding process, the work that requires high precision and high reliability is the work of passing the wire through the microhole 4 of the magnetic head 1.
In order to perform this wire threading operation accurately and without failure, it is necessary to position the magnetic head microhole.

As shown in FIGS. 9 and 10, the conventional method for positioning a microhole is that before winding, the image processing unit [20] detects and measures the position of the microhole, and determines the amount of correction (image processing reference position). controller 35
In this method, a signal is sent to the table unit 34, and the table is moved based on the correction data to position the wire at a position where the wire is passed through the microhole of the winding device 36.

Image processing device! ! As shown in FIG. 10, the configuration of 20 is to take an image of the microhole of the magnetic head using transmitted light from a light source device 37, and this image is magnified to a high magnification by a lens 38 to improve accuracy.

[Problem to be solved by the invention]

In the above conventional technology, as shown in FIG. 9, an image processing system for positioning the microhole and a winding device 36 for passing the wire through the microhole
are each independent. Therefore, even if the accuracy of position correction by image processing is high, the mechanism for passing lines is
As shown in the figure, the guide 8 and clamper 40 have a movable structure (respective movable mechanisms are described in Japanese Patent Application No.
58812, Japanese Patent Application No. 61-74316), mechanical displacement of the winding device 36 to the microhole, or misalignment of the microhole occurs between after image processing and immediately before winding. In this case, there is a problem of failing to pass the wire through the microhole.

Furthermore, even if the mechanical precision of both is improved, the accuracy is limited by the cumulative error of both, and in addition, the equipment becomes expensive, making it impractical as a device and hindering high reliability. ing.

Furthermore, when the sensor and the winding device are independent, it is necessary to detect two positions: the microhole and the wire, and the measurement process takes time.

The purpose of the present invention is to position a microhole accurately and at high speed in a device for winding a wire on a wound body having a microhole, such as a magnetic head, to improve the @ wire success rate, and to It is an object of the present invention to provide a positioning device for a microhole that can reliably pass a wire even when a mechanical positional shift occurs in a wire threading mechanism.

[Means to solve the problem]

The above purpose is to mechanically fix the relative position of the microhole detection means for correcting the position of the wire passing through the microhole and the position of the microhole, and measure the amount of position correction of the microhole. This is achieved by positioning the center of the microhole at the position through which the wire passes.

[Embodiments of the invention]

An embodiment of the present invention will be described based on the drawings.

1 to 3 show a magnetic head positioning device, in which a magnetic head 1 is held vertically by a holder 5. FIG. The magnetic head 1 includes a slide unit 6a,
6b and drive motors 7a and 7b, it can move in the left-right direction and up-down direction.

The wire 3 advances through the groove 9 of the guide 8, passes through the microhole 4, and is wound. The width of the groove is such that the wire 3 can easily pass therethrough. The image sensor 1o is embedded and fixed under the groove 9 of the guide 8. At this time, the distances ΔX and Δ2 between the center position of the groove 9 and the center position of the image sensor 1o are measured,
The passing position of the line and the relative position of the sensor 10 are determined.

FIG. 4 shows the system configuration of the image sensor 10. An objective lens 11 is attached to the tip of the image sensor 10, and the detection range and detection distance of the microhole can be adjusted. The image of the microhole captured by the objective lens 11 is optically transmitted through a fiber 12 and sent to an eyepiece 13, where it is enlarged to a required size on a monitor 15 by an eyepiece 14. The illumination device is composed of an epi-illumination 16 built into the image sensor 10 (which may be installed separately) and a transmitted illumination 17 from the opposite side of the image sensor 10 and the microhole.The former is used for observing and inspecting the winding state. The latter is used for image processing for positioning microholes. Switching of the light source 18 is performed by a changeover switch 19.

The signal from the image processing 20 is transmitted to the motor 7a shown in FIG.
7b is fed back to the driver circuit 21, and the third
Slide unit 6a shown in the figure.

6b. Signals from the image processing device 20 are sent via the microcomputer 22. Further, the winding state is inspected by performing a shape inspection using an inspection device 23 connected to the monitor 15.

A method for positioning the microhole of the magnetic head at a position through which a wire passes will be explained using FIGS. 1 to 4. FIG. The magnetic head 1 is fixed to the holder 5, and is moved by a certain amount by driving the slide units 6a and 6b to a position where the line passes immediately in front of the guide 8. In the transferred state, the positions of the microholes vary due to the holding state of the magnetic head 1 and errors during transfer.

After the transfer is completed, the changeover switch 19 of the light source device 18 shown in FIG. 4 is set to the transmitted illumination 17, and measurement of the micropores is started. By irradiation with the transmitted illumination 17, an image of the microhole is sent to the image processing device 20 through the image sensor 10. The image processing device 20 is provided with a reference frame 24 shown in FIG. 5 in which the relative positional deviation between the line passing position of the guide 8 and the image sensor 10 is corrected in advance. When superimposed, the positional deviation amount Δxl in the X direction (horizontal direction of the microhole) and Z direction (height direction of the microhole)
, Δz, is measured.

The measurement method uses an image processing device 20 (for example, 3 manufactured by Kyuu Denki Co., Ltd.).
Z4SP). The positional deviation correction data Δxl+Δz1 measured by the image processing device 20 is sent to the microcomputer 22 shown in FIG. 4, and the data is further sent from the microcomputer 22 to the table unit for moving the magnetic head, and the data is sent to the motor 7a shown in FIG. .

By driving slide unit 7b, slide units 6a, 5
b, completes the correction movement in the X direction and the Z direction, and completes the positioning.

After positioning, insert the wire 3 into the microhole and start winding. However, if the position correction described above is performed just before inserting the wire 3, the same conditions will be maintained even when winding is performed several times, and the micro After completing the zero winding, which allows the wire to pass through the hole without failure, switch the light source 18 of the lighting device and turn on the epi-illumination 1.
6, the shape of the winding is inspected using the inspection device 23.

As shown in FIG. 3, in the present invention, the passing position of the wire 3 and the relative position of the image sensor 10 can be mechanically fixed.
Even if the microhole is misaligned due to poor holding of the magnetic head 1 or the line passing position is misaligned due to movement of the line guide 8, the position of the microhole in the magnetic head 1 can be easily and accurately corrected by the image sensor 10. It has the effect of allowing you to thread the wire without making mistakes. In addition, the position where the wire is passed through the microhole of the magnetic head 1 is the same as the position where the position of the microhole is corrected, and the microhole is constantly monitored. There is no loss time in hole position correction, and there is no need to detect the position of the wire, so high-speed positioning is possible. That is, positioning can be performed after the wire threading is completed and before the next wire threading.

Another embodiment in which an optical fiber sensor is used instead of the image sensor and image processing device used for positioning will be described.

The optical fiber type sensor is a sensor that reacts by blocking light input from the sensor, and is installed at the same position as the image sensor 10 shown in FIG. 3. In this embodiment, since positioning is performed by the sensor alone, the light source 18, transmitted illumination 17, epi-illumination 16, and image processing device 20 shown in FIG. 4 are not required.

Next, the measurement method will be explained. First, while the magnetic head 1 is held, the slide units 5a and 5b are moved by the motors 7a and 7b. At this time, adjust the sensitivity so that the sensor will respond if the microhole moves in front of the sensor. After the microhole is set in front of the sensor, adjust the position where the line passes as described above. Since the positions of the sensors are relatively determined, the slide units 6a and 6b are further moved to perform positioning based on this correction data.

Other operations are similar to those of the previous embodiment. In the example using this optical fiber sensor, since the microhole is directly detected, the measurement accuracy is inferior to the above embodiment in which the microhole is enlarged for measurement, but the illumination device and image processing device can be omitted. , the effect of reducing the value of the device can be achieved.

〔Effect of the invention〕

According to the present invention, the positioning of a microhole in a magnetic head or the like can be performed accurately and at high speed. In addition, even if a mechanical misalignment occurs in the mechanism that passes the wire through the microhole, the wire protrusion position and the sensor position are fixed relative to each other, so the wire can be threaded reliably. It is possible to improve the success rate.

Further, since the sensor is located at the position where the winding is performed, the state of the winding can be monitored, and the shape inspection after the winding is finished at the same time as the winding is finished, which has the effect of shortening the inspection time.

[Brief explanation of drawings]

1 to 5 show an embodiment of the present invention, in which FIG. 1 is a plan view of a magnetic head positioning device, FIG. 2 is a side view of the device, and FIG. 3 is an illustration of the device. A partial perspective view, FIG. 4 is a system configuration diagram of the same device, and FIG. 5 is an explanatory diagram of measurement of micropores of the same device. Figure 6 is a front view of a magnetic head with windings, Figure 7 (A
) to (E) are explanatory diagrams showing the order of winding, FIG. 8 is a perspective view of a magnetic head winding device, FIGS. 9 and 10 are explanatory diagrams of a conventional image processing device, and FIGS. FIG. 12 is an explanatory diagram of a conventional microhole positioning device. 1...Magnetic head, 3...
・Wire rod, 5...Holder, machining 0...
. . . Image sensor, 20 . . . Image processing device. Figure 1 Figure 2 Figure 4 Figure 8 0 ○ ~ 21 Figure 0 Futu σ F Figure Figure 11 Figure ρ Figure 10 A ρ Figure 2

Claims (3)

[Claims] (1) In a device for positioning a microhole at a wire insertion position, means for guiding or gripping the wire passing through the microhole;
fixing means for fixing the microhole detection means in a relative position;
A microhole positioning device comprising means for detecting and correcting the relative position between the position of the microhole and the wire insertion position using the microhole detection means fixed by the fixing means. (2) The microhole positioning device according to claim 1, wherein the microhole detection means is fixed to a wire guide means, and the relative position between the wire passing position and the microhole is corrected. (3) The microhole positioning device according to claim 1, wherein the microhole detection means is fixed to the wire gripping means, and the relative position between the wire passing position and the microhole is corrected.