JP3319106B2 - Outermost slit shielding device for color selection mechanism of color cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and more particularly, to an outermost end slit of a color cathode ray tube color selection mechanism suitable for a phosphor exposure step through a slit of a color selection mechanism (mask) of a Trinitron (trade mark) tube. The present invention relates to a shielding device.

[0002]

2. Description of the Related Art In a color cathode ray tube, particularly a trinitron tube, a color selection mechanism (FAG) having a slit for transmitting an electron beam is arranged opposite to a color fluorescent screen formed on the inner surface of a front panel. An electron beam corresponding to each color arriving at a different angle is respectively landed on the phosphor of each color on the phosphor screen. As shown in FIGS. 5 and 6, this type of color selection mechanism is provided with a thin steel plate aperture grill (AG) 3 in which a plurality of slits 2 extending in one direction, for example, a vertical direction, are arranged in a frame 1 made of a steel material. Stretched and configured.

As shown in FIG. 5, a frame 1 has a pair of frame pieces 1a and 1b opposed to each other and both frame pieces 1a and 1b.
It has arms 1c and 1d extending between them. Each of the frame pieces 1a and 1b has an L-shaped cross section, and the aperture grill 3 is placed on one end face of each of the pieces and welded. The aperture grille 3 acting as a grid stretched over the frame 1 has a slit 2 for transmitting an electron beam formed by selectively etching one thin mild steel plate. Of the many slits 2 formed in the FAG, slits at both outer ends (hereinafter referred to as outermost end slits) 2a are buffer slits (FIG. 7) for adjusting the tension of the AG. Since it is also called a dummy slit, it is not used as this electron beam transmitting slit. Therefore, it is not necessary to expose the phosphor screen as an effective screen, and it becomes an unnecessary portion as a mask at the time of exposure. Therefore, conventionally, after an operator visually confirms before a phosphor exposing step of a panel portion of a cathode ray tube, a dedicated tape is stuck on an outermost end slit to shield and prevent exposure.

[0004]

As shown in FIG. 7, the worker manually attaches the outermost end slit (slit width 40 μm) in which the slit pitch of 60 μm is arranged at a fine pitch interval of 250 μm class. Shielding was poor in workability and workability was unstable.

In view of the above problems, the present invention provides an outermost end slit shielding device of a color cathode ray tube color selection mechanism capable of shielding an outermost end slit of an aperture grill with high accuracy and good workability during exposure. The purpose is to provide.

[0006]

According to a first aspect of the present invention, there is provided a color cathode ray tube having a plurality of slits for transmitting an electron beam. In order to prevent the fluorescent screen from being exposed by light passing through the outermost slit of the tube color selection mechanism,
An apparatus for shielding light passing through an outermost end slit portion at the time of exposure, wherein the block is slidable and rotatable, and is supported by a tip of an arm held by the block and shields the outermost end slit. and obtaining shielding means, and each camera that recognizes both end portions each image of outermost slit of the upper Symbol color selecting an image processing apparatus for processing an image obtained by the camera, acquired by the image processing apparatus On
The above block based on the position data of the outermost slit
And the shielding means for the outermost end slit is
A drive that shields the outermost end slit by adjusting the position and angle
Characterized by having moving means .

According to the present invention, a pair of devices including the block, the arm, the shielding means, the driving means, and the camera are provided on the left and right sides of the color selection mechanism .
Are disposed opposite to the outermost ends of the .

Further, according to the present invention, as described in claim 3, the slit which slides independently in the longitudinal direction of the slit is provided.
Provide at least a pair of sliders and slide the block
Sliding means for guiding, wherein the shielding means is
Is composed of two shielding plates driven by the slider, it is preferable that the shielding means is so as to shield the shielding plate of the two above for the Saisototan slit.

[0009] Furthermore, as shown in claim 4 according to the present invention, in the block above, by detecting the reference points set in the block, it is arranged a sensor for checking the position of the block preferable.

[0010]

According to the present invention, the outermost one of a plurality of slits formed in the color selection mechanism (FAG), particularly the grid thin plate (aperture grille: AG) 3 in the phosphor exposure step of the panel portion of the color cathode ray tube. The end slits 2a and 2b can be accurately and reliably shielded, and by exposing with the outermost end slits shielded, a fluorescent screen which can be used as an effective screen can be obtained.

That is, in the present invention, the image of the outermost end slit portion is recognized by the camera, and the image processing means 22 processes the image to calculate the distance and slit inclination required for shielding the outermost end slit. In this device, the shielding plates 12a, 12
b is held by a block 13 which can slide and rotate .
The block 13 has the distance required for shielding the outermost end slit.
Actuator driven according to tilt and slit inclination
In order to move by the blocks 11a and 11b, the angle of the shielding means (plate) can be adjusted to be parallel to the positions of the outermost slits 2a and 2b, and the block 13 is slid along the linear motion guide 16 to form the shielding plate 12a. , 12b can be moved by a distance necessary to shield the outermost end slits 2a, 2b described above. Thus, the shielding plates 12a, 12b
, The outermost end slit can be reliably shielded.

In the present invention, the outermost end slits 2a and 2b of the grid thin plate 3 of the color selection mechanism are provided on both the left and right sides of the FAG, and the shielding plates 12a and 12b are used to shield both end slits 2a and 2b. The block 13, the arm 17, the slide means 14a, 14b, 16, 18, 27a, 27b, and the CCD camera 21 are also provided to face each other.

In the present invention, the shielding means shields the outermost slits 2a and 2b with the two shielding plates 12a and 12b.
The outermost end slits 2a and 2b can be accurately shielded according to the frame width of the FAG by the image signal from 1.
Further, in the present invention, since the sensor for detecting the reference point of the block 13 is provided above the block 13, the shielding plate 12
Position control of a and 12b can be performed with high accuracy.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a plan view of an embodiment of the outermost end slit shielding device of the color selection mechanism according to the present invention, and FIG.
FIG. 1 and 2, 11a, 11
b is a linear actuator (LA) for precisely driving the shielding plates 12a and 12b for shielding the outermost end slits (2a and 2b) of the FAG, and 13 is a sliding and rotating block, and shielding plates 12a and 12b. Holding the sliders 14a and 14b for opening and closing the slit by
If there is a small angle deviation from the slit, the shielding plates 12a and 12b can be adjusted so as to be slightly rotated about the fulcrum 15 and become parallel.

The block 13 is slidably mounted on the linear motion guide 16 by a first cylinder 18 fixed to a receiving table 28.
Further, the block 13 includes sliders 14a and 14b and a second fixed to each of the sliders 14a and 14b.
Cylinders 27a, 27b and sliders 14a, 1
Arms 17a and 17b fixed to each of 4b are placed. The arms 17a and 17b are shielded.
It has plates 12a and 12b, respectively.

Accordingly, the shielding plates 12a and 12b are coarsely moved by the first cylinder 18 in the direction of the FAG's AG slit arrangement, and the second cylinders 27a and 27b, respectively, are perpendicular to the FAG's AG slit arrangement direction. Slider 14a, 1 in the direction (ie, the long side direction of the slit).
An opening / closing operation is performed along 4b.

Next, the cylinder 18 is used to advance and retreat the block 13 and to increase the positioning accuracy by accurately moving the linear actuators 11a and 11b by normally pressing the block 13 against the linear actuator 11. I have. Reference numeral 20 denotes an aperture grill (AG).

FIGS. 1 and 2 show a set of devices mounted in connection with one outermost end of the AG. However, in actuality, in the present embodiment, the present apparatus is attached to the other side of the FAG. That is, a pair of outermost end slit shielding devices are provided so as to face the color selection mechanism. 2
1 is an image recognition camera arranged above a corner of the AG,
For example, it is a CCD camera, and in the figure, two CCD cameras 21 are provided. Also, above the block 13,
An origin and an overrun sensor 24 for confirming and detecting the position of the fulcrum 15 (reference point) of the block 13 are provided. Hereinafter, the operation of the outermost end slit shielding device of the color selection mechanism shown in FIGS. 1 and 2 will be described with reference to the procedure block diagram of FIG.

In the initial state of the apparatus, the block 13 is pushed inward by the first cylinder 18 and the shielding plate 12 is pressed.
a and 12b are arranged at a position (point P) near the center of the AG, and furthermore, the shielding plates 12a and 12b are
Is in a state partially close is Ji overlap with Ri閉 each other (Step 1). As described above, the PAG in which the FAG is mounted on the inner surface with the shielding plates 12a and 12b facing the center.
L (PAG) is placed at the exposure position manually or by a transport mechanism (step 2).

Next, the first cylinder 18 is returned to the front side, and the block 13 is moved backward until it comes into contact with the LAs 11a and 11b. The sliders 14a and 14b are driven to move the shielding plates 12a and 12b to the ends of the AG. At the same time, the shielding plates 12a and 12b are moved outward by the second cylinder to open each other (step 3).

Next, the exposure shutter of the exposure table is opened to irradiate the panel 5 with light (step 4). Then, AG
The CCD camera 21 arranged above the four corners of
The position of the image of the outermost slit of the currently set AG is recognized and stored in the memory of the image processing apparatus (step 5).

Thereafter, the shutter is once closed to temporarily stop the light irradiation (step 6), the image memory in the image processing apparatus is digitally processed, and the outermost end slit of the reference AG stored in the image processing apparatus in advance. Compare to the location data of
If there is a difference, m from the pixel data of the CCD camera 21
m, and multiplied by a mechanical correction coefficient, and then converted into pulse amounts for the left and right linear actuators 11a and 11b, respectively.
b, the shielding plates 12a and 12b are pushed out by a predetermined distance, and a position control for adjusting a precise position and an angle with respect to the outermost end slit of the FAG is performed (step 7), and the slit pattern in this portion is shielded from light. Prevent exposure.

Next, a main exposure is performed by opening the exposure shutter of the exposure table and irradiating light (step 8). 5 from opening the shutter until the outermost slit is actually blocked
Within about seconds, there is no particular problem in the quality of the fluorescent screen of the color cathode ray tube in the irradiation by the exposure table. Therefore, the outermost end slit portion could be reliably and accurately shielded by the above procedure within this time, and exposure could be prevented. After a predetermined main exposure time has elapsed, the shutter is closed to end the exposure (step 9). After that, the shielding plate was LA11
The state is returned to the state before the first LA precision alignment by a and 11b (step 10). Steps 5 to 10 are repeated at the three color G, B, and R positions, all exposures are completed, and the shielding plate is returned by the first cylinder 18 and the second cylinders 27a and 27b (step 11). Finally, PA
G is removed and transferred to the developing process (step 12).

FIG. 4 is a conceptual view of the connection of the shielding plate control unit of the present invention. As shown in FIG. 4, the shielding plate control unit of the present invention has an A
A total of four CCD cameras 21 arranged one by one above the four corners of G are connected to the image processing device 22, and the image processing device 22 is further connected to the monitor 23. On the other hand, the image processing apparatus performs signal processing with the sequencer 26. In this sequencer 26, two linear actuators, two on each side of the AG, a total of four linear actuators 11 are connected to the servo amplifier 25, respectively, and NC control is performed. Also, this sequencer 2
6 sends signals for cylinder control and display control, while sensor switch inputs are sent to sequencer 26.

[0026]

As described above, according to the present invention, among the slits of the color selection mechanism formed by etching or the like, the buffering slit at the outermost end of the AG can be reliably and precisely formed in the phosphor exposure step. Can be shielded.

Accordingly, since the phosphor exposure by the slits at both ends can be prevented, the entire phosphor screen formed by the exposure can be used as an effective screen, and the quality of the color cathode ray tube can be improved. In addition, there is no need to perform a conventional operation such as affixing the tape to the outermost end slit before the phosphor exposure or the peeling of the tape after the exposure, so that the workability can be improved.

[Brief description of the drawings]

FIG. 1 is a plan view illustrating an outermost end slit shielding device of a color selection mechanism according to the present invention.

FIG. 2 is a side view of the outermost end slit shielding device shown in FIG.

FIG. 3 is a procedure block diagram of the outermost end slit shielding device according to the present invention.

FIG. 4 is a connection conceptual diagram of a shielding plate control unit according to the present invention.

FIG. 5 is a frame perspective view of a color selection mechanism of the color cathode ray tube.

FIG. 6 is a schematic front view of a color selection mechanism of a color cathode ray tube.

FIG. 7 is an enlarged view of an X portion of the AG.

[Explanation of symbols]

 Reference Signs List 1 frame 2 slit for transmitting electron beam 2a, 2b outermost slit for buffer 3 aperture grill (grid thin plate) 5 panel 7 pin 8 spring 11a, 11b linear actuator 12a, 12b shielding plate 13 block 14a, 14b slider 15 fulcrum 16 linear Motion guide 17a, 17b Arm 18 First cylinder 20 Aperture grill 21 CCD camera 22 Image processing device 23 Monitor 24 Origin and overrun sensor 25 Servo amplifier 26 Sequencer 27a, 27b Second cylinder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 9/227

Claims (4)

(57) [Claims] In the step of exposing a phosphor layer of a color cathode ray tube using a color selection mechanism as a mask, the outermost end slit of the color cathode ray tube color selection mechanism having a large number of slits for transmitting an electron beam is shielded from an exposure light source. apparatus for, outermost slide and the block can pivot, and shielding means capable of shielding and the outermost end slits is supported on the distal end of the arm which is held in the block, the upper Symbol color selecting Cameras for recognizing images at both end portions of the end slit, an image processing device for processing an image obtained by the camera, and a position of the outermost end slit obtained by the image processing device
The block is driven based on the data, and the outermost
Adjust the position and angle of the shielding means with respect to the lit
An outermost-end slit shielding device of a color selection mechanism for a color cathode-ray tube, comprising a driving means for shielding the outermost-end slit. 2. A pair of devices comprising said block, arm, shielding means, driving means and said camera are respectively arranged opposite to the left and right outermost ends of said color selection mechanism. The outermost-end slit shielding device of a color selection mechanism of a color cathode ray tube according to claim 1, wherein: 3. A slit independently of a longitudinal direction of the slit.
At least a pair of sliders for guiding
A sliding means for sliding the lock, and the shielding means comprises two sheets driven by each of the sliders.
2. A color selecting mechanism for a color cathode ray tube according to claim 1 , wherein said shielding means is constituted by a shielding plate, and said shielding means shields said outermost end slit by said two shielding plates. Outer end slit shielding device. 4. A said block upper, set in the block
2. The outermost end slit shielding device of a color selection mechanism of a color cathode ray tube according to claim 1, further comprising a sensor for detecting the reference point and confirming the position of the block .