JPH03225205A - Detection of hole position of object - Google Patents

Abstract

PURPOSE:To highly accurately detect the position of an object by transmitting a detecting light beam through the hole of the object and detecting the width of transmitted light beam arriving at an image sensor by the output of the image sensor. CONSTITUTION:An electron gun 11 is mounted on a rotary correction board 21. A valve 12 is mounted on a valve holding stand. In such a case, the center vertical axis of the electron gun 11 and the center axis of the valve 12 are coaxially set up so that the virtual line H-H of the valve 12 on an image face coincides with the optical axis direction of a light source device 22 and the linear image sensor 23. In such a state, a detecting beam is generated from the device 22. Then, a control device 30 controls the drive of a motor 25. Thereby, the correction board 21 mounting the electron gun 11 are rotated between the device 22 and the sensor 23 so that the detecting beam generated from the device 22 scans a range covering one side of the periphery of the hole 13 of the gun 11 to the other side through the hole 13. Then, the device 30 detects the position of the hole 13 from the output of a D/A converter 29 connected to the sensor 23 and its bit counter 28 and the output of a pulse counter 27.

Description

Detailed Description of the Invention [Industrial Application Field] The present invention provides a method for sealing, for example, an electron gun of a color picture tube in a picture tube bulb, which is equipped with a through hole having a center line that intersects with the central vertical axis. The present invention relates to a method for detecting the position of a hole in an object, which is suitable for use in detecting the position of an electron gun in an object and setting the electron gun at a predetermined position.

[Prior Art] Conventionally, as shown in FIG. 4, a method for detecting the hole position of an electron gun 2, which has a through hole 1 having a center line intersecting the central vertical axis, involves installing lasers on both sides of the electron gun 2. 3 and photocell 4 are arranged so that the laser beam emitted from the laser 3 scans an area around the through hole 1 of the electron gun 2 from one side of the electron gun 2 through the chain hole 1 to the other side. is rotated with respect to the laser 3 and the photocell 4, and when the amount of light detected by the photocell 4 becomes maximum, it is determined that the center of the through hole 1 is on the optical axis of the laser 3.

[Problem to be solved by the invention] However, due to the influence of the lens precision, the light energy distribution around the optical axis of the laser light passing through the optical lens provided in the laser 3 is uneven, and the brightest part A
may become eccentric with respect to the optical axis as shown in FIG. B is the dark area.

When the hole position is detected using such laser light, the output voltage V (proportional to the amount of detected light) of the photocell 4 with respect to the rotation angle θ of the electron gun 2 is as shown in FIG. That is, the output voltage of the photocell 4 is maximized at the center of the through hole 1 or at a position OA located on the optical axis of the laser 3.The center of the through hole 1 is the brightest part A of the laser beam.
The maximum value is reached at a position θM that coincides with .

That is, in the conventional method, even when the center of the through hole 1 is not necessarily on the optical axis of the laser 3, the amount of light detected by the photocell 4 may reach the maximum, making it impossible to accurately detect the center position of the through hole 1. .

The present invention consists of 1. The purpose is to detect the hole position of an object with high precision.

[Means for Solving the Problems] The present invention arranges a light source device and a light receiving sensor on both sides of an object having a hole, and detects nucleation from the edge of the detection light emitted from the light source device or from one side of the object around the hole. In a method for detecting a hole position in an object, the object is moved relative to a light source device and a light-receiving sensor so as to scan a range from one side to the other side, and the hole position is detected based on a change in the light-receiving state of the light-receiving sensor. An image sensor is used as a light receiving sensor, and the detection light beam passes through a hole in the object and the width of the transmitted light reaching the image sensor is detected by the output of the image sensor, and when the width of the transmitted light reaches the maximum, the nucleus is detected. The center of the image is determined to be on the optical axis of the light source device.

[Operation] According to the present invention, when the detection light beam is scanned from one side of the object around the hole to the other side through nucleation, the detection light beam passes through the hole of the object and is detected by the image sensor. The width of the transmitted light reaching the image sensor is detected by the output of the image sensor, and when the width of the transmitted light reaches the maximum, it is determined that the center of nucleation is on the optical axis of the light source device.

At this time, in the present invention, the hole position is detected not by the amount of light detected by the light receiving sensor but by the width of the transmitted light measured by the image sensor. It is not affected by the uniformity of energy distribution. Therefore, the hole position of the object can be detected with high precision.

[Example] Fig. 1 is a block diagram showing an example of a detection device used for implementing the present invention, Fig. 2 is a schematic diagram showing a linear image sensor, and Fig. 3 is a schematic diagram showing a detection state of the present invention. be.

In FIG. 1, 11 is an electron gun of a color picture tube, and 12 is a picture tube bulb. When sealing the electron gun 11 in the bulb 12, an imaginary line x-x passing through the centers of the three electron beam holes of the electron gun 11 is an imaginary line in the longitudinal direction passing through the center axis of the image plane of the bulb 12. A match for H-H is preferred.

The virtual line xx is managed by a square-shaped through hole 13 having a center line (X-X) in a direction perpendicular to the central vertical axis of the electron gun 11.

The detection device 20 detects the position of the hole 13 so that the center line (X-X) of the hole 13 coincides with the virtual line H-H of the valve 12.

The detection device 920 includes a rotation correction table 21 that can rotate the electron gun 11 having the hole 13 about the central vertical axis of the electron gun 11 . On both sides of the rotation correction table 21,
For example, a light source device 22 made of a halogen lamp and a linear image sensor 23 as a light receiving sensor are arranged.

The rotation correction table 21 is rotated by a motor (for example, a pulse motor) 25 via a gear train 24 . That is, the rotation correction table 21 allows the detection light beam emitted from the light source device 5122 to pass through the nucleation 1 from one side around the through hole 13 of the electron gun 11.
The electron gun 11 is rotated relative to the light source device 22 and the linear image sensor 23 so as to scan the range passing through the electron beam 3 and extending to the other side. The motor 25 has a rotary encoder 26
The pulses generated by the rotary encoder 26 corresponding to the rotation angle of the rotary correction table 21 are counted by a pulse counter 27.

The linear image sensor 23 is configured with, for example, a 2048-bit photodiode, and has a light receiving range (
From the photodiode in the range S in Figure 2), r
lJ, and "0" is output from photodiodes that are not within the light receiving range. Output r of linear image sensor 23
Among lJ and “0”, the number of outputs of rlJ is counted by a bit counter 28, and the count result of the bit counter 28 is D/A converted by a D/A converter 29. That is,
The bit counter 28 uses the output of the linear image sensor 23 to determine the width Wx of the transmitted light when the detection light beam passes through the through hole 13 of the electron gun 11 and reaches the linear image sensor 23.
will be detected.

The width of this transmitted light WI W2... is the electron gun 1
1, the rotation angle θ changes as shown in FIG.

The output of the D/A converter 29 and the output of the pel counter 27 are transferred to the control device 30. The control device 30 controls the motor 2
5, obtains the output of the D/A converter 29 and the output of the pulse counter 27, and determines the rotation of the electron gun 11 when @W x of the transmitted light reaches the maximum, which is the count result of the bit counter 28. At the angle OA, it is determined that the center of the through hole 13 is on the optical axis of the light source device 22.

Below is the detection device! The operation of detecting the position of the hole 13 using the hole 13 will be explained.

+1) First, the electron gun 11 is mounted on the rotation correction table 21.

Further, the valve 12 is mounted on a valve holding stand (not shown). At this time, the central vertical axis of the electron gun 11 and the central axis of the bulb 12 are set on the same axis, and the light source device 22 and the linear image sensor 23 are placed on the virtual line H-H on the image plane of the bulb 12. Match in the axial direction. In this state, the light source device 22 emits a detection light beam.

(2) Next, the control device fi30 drives and controls the motor 25. As a result, the detection light emitted from the light source device jtt22 can be directed from one side of the hole 13 of the electron gun 11 to the hole 13.
A light source device 22,
Rotates relative to the linear image sensor 23.

(3) Next, the control device I30 controls the linear image sensor 2.
3 and the D/A connected to its bit counter 28
The output of the output 9-pulse counter 27 of the RIA device 29 is obtained, and the position of the hole 13 is detected by the following (1) and (2). (
(See Figure 3).

■The rotation angle position θX of the rotation correction table 21 at the time when the output value of the D/A converter 29 begins to exceed a predetermined threshold value K;
The rotational angular position θy of the rotation correction table 21 at the time when it starts to go below the threshold value K is measured. Then, the motor 25 stops the rotation correction table 21 at the rotation angle position θy, and
The control device 30 measures the rotation angle amount a of the rotation angle correction table 21 when the D/A converter 29 is outputting a value corresponding to the width Wx of the transmitted light exceeding the threshold value K.

(2) After the measurement in (1) (2) is completed, the motor 25 is rotated in the reverse direction from the stop position in (2) above by an amount of rotation angle a/2 and then stopped. This stop position is the position where the radiation Wx of the transmitted light is maximum, and the hole 1
3 coincides with the optical axis of the light source device N22 at this rotational angular position (OA).

Note that in Section 1 (3), after measuring the rotational angular positions θX, θy and the rotational angular amount a, the control device 30 determines that the encoder value of the rotary encoder 26 is Ox + a /
2 or θy - a / 2, and then the motor 25 may be stopped.

Further, in (3) above, the control device 30 controls the threshold value K
11 by tracking the width Wx of transmitted light, which is the count value of the bit counter 28, while rotating the electron gun 11 without setting
The rotational angular position (OA) of the electron gun 11 when the width Wx of the transmitted light changes from increasing to decreasing is detected as a position that coincides with the center of the hole 13 or the optical axis of the light source device 22. It's okay.

Next, the operation of the above embodiment will be explained.

According to the above embodiment, the detection beam is transmitted through the hole 13 of the electron gun 11.
When the area is scanned from one side of the surrounding area through the chain hole 13 to the other side, the detection beam or electron gun 11
The width Wx of the transmitted light that passes through the hole 13 and reaches the linear image sensor 23 is detected by the output of the linear image sensor 23, and when the width Wx of the transmitted light reaches the maximum, the center of the nucleation 13 is determined. It is determined that it is on the optical axis of the light source device f22.

At this time, in the above embodiment, the position of the hole 13 is detected not by the magnitude of the amount of light detected by the light receiving sensor but by the magnitude of the width Wx of the transmitted light measured by the linear image sensor 23. It is not affected by the uniformity of the light energy distribution around the optical axis of the light beam. Therefore, the position of the hole 13 of the electron gun 11 can be detected with high precision.

Note that in implementing the present invention, an area image sensor may be used as the image sensor.

Further, the present invention is applicable not only to the through-hole of an electron gun but also to detecting the position of a hole in a wide range of general objects.

Further, in implementing the present invention, the object may be kept stationary, and the light source device and the image sensor may be moved.

[Effects of the Invention] As described above, according to the present invention, the position of a hole in an object can be detected with high precision.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing an example of a detection device used in carrying out the present invention, FIG. 2 is a schematic diagram showing a linear image sensor, FIG. 3 is a schematic diagram showing a detection state of the present invention, and FIG. 4 is a schematic diagram showing a detection state of the present invention. FIG. 5 is a block diagram showing a conventional detection device, FIG. 5 is a schematic diagram showing a laser beam, and FIG. 6 is a schematic diagram showing a detection state by the conventional method. DESCRIPTION OF SYMBOLS 11... Electron gun, 13... Cap 1 hole, 20... Detection device, 22... Light source device, 23... Linear image sensor, 25... Motor, 27... Pulse counter, 28 ...Bit counter, 30...Control device.

Claims (1)

[Claims] (1) A light source device and a light receiving sensor are arranged on both sides of an object having a hole, so that the detection light beam emitted from the light source device scans the range from one side of the object around the hole to the other side through the hole. In a method for detecting a hole position of an object in which the object is moved relative to a light source device and a light receiving sensor and the hole position is detected based on a change in the light receiving state of the light receiving sensor, an image sensor is used as the light receiving sensor and the detection light beam is detected. The width of the transmitted light that passes through the hole in the object and reaches the image sensor is detected by the output of the image sensor, and when the width of the transmitted light reaches the maximum, the center of the hole is on the optical axis of the light source device. A method for detecting the position of a hole in an object, characterized by determining that there is a hole in the object.