JPS60143551A - Positioning device - Google Patents

Abstract

PURPOSE:To enable a structure installed in a vacuum case to be moved from its outside so as to perform positioning by closely fixing a bellows made of a metal having the same expansion coefficient as the material of the case to the case in such a manner as to close the holes of the case. CONSTITUTION:To a vacuum case 37 used to install the electrode block 38 of a plate-type picture device, a bellows 43 made of a metal having the same expansion coefficient as the material of the case 37 is closely fixed either by fusion or with a low-temperature powdered glass adhesive in such a manner as to close a few holes formed in the periphery of the case 37. Next, a control screw 44 is screwed into a screw hole formed in a band 39 attached around the case 37 to press the inner surface of the bellows 43 moving the electrode block 43, thereby performing positioning. After that, the screw 44 is removed and a resin adhesive is packed into the internal space 46 of the bellows 43 to fix it. Therefore it is possibile to easily correct the positional shift, caused due to the difference in expansion coefficient during the temperature increase, from outside the case 37.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to an alignment device for aligning structures and parts within a vacuum vessel such as a cathode ray tube (hereinafter referred to as CRTj).

Conventional Structure and Problems In conventional CRTs, the shadow mask and the phosphor surface have been aligned by a direct exposure method, in which a phosphor is coated in accordance with the shadow mask. in this case,
There must be a one-to-one correspondence between the shadow mask and the face coated with phosphor, and the process must be carried out with the shadow mask and face coated as a pair.

On the other hand, in flat panel display devices, the number of electrodes that must be aligned is large due to the structure, and the direct exposure method used in conventional CRTs cannot be used. In addition, because this configuration has a large number of control blocks, even if the containers are aligned before sealing, differences in expansion coefficients due to temperature rise during sealing and deformation of the container after evacuation may occur. There was a problem in that the electron beam could not hit the correct position of the phosphor due to a large number of positional deviations.

OBJECTS OF THE INVENTION The present invention solves the above-mentioned drawbacks of the conventional apparatus, and an object of the present invention is to provide a positioning device that can perform positioning adjustment after a vacuum is triggered.

Structure of the Invention The alignment device of the present invention is made of a metal whose expansion coefficient matches that of the material of the container, which is closely fixed to a container filled with a vacuum or low-pressure special gas in a state where the hole in the container is closed. Be0-z and
The structure includes an adjusting means for moving and aligning the structure inside the container from the outside of the container via the bell D-ze.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

First, a flat display bag [d] will be explained with reference to FIGS. 1 to 3 as an example of a vacuum container whose alignment is performed using an alignment device according to an embodiment of the present invention. Conventionally, cathode ray tubes have been mainly used as display elements for displaying color television images, but conventional cathode ray tubes have a very long depth compared to the screen size.
It has been impossible to create thin television receivers.

In addition, although EL display elements, plasma display devices, liquid crystal display elements, etc. have recently been developed as flat display elements, all of them are insufficient in performance such as brightness, contrast, and color reproducibility of color display. However, it has not yet been put into practical use. Therefore, we aimed to achieve a device that can display color television images on a flat display device using electron beams, and we divided the screen vertically into multiple sections. An electronic beam is generated for each section, each electron beam is deflected vertically for each section to display a plurality of lines, and the electron beam is further divided horizontally into a plurality of sections and each section is divided into K. By sequentially emitting light from R-G-B phosphors, etc., and controlling the amount of electron beam irradiation to the R-G-B phosphors using color video signals, the television as a whole is created. A device that displays images was devised. First, a basic configuration example of the image display element used here will be explained with reference to FIG. This display element consists of, in order from the back to the front, a back electrode (1), a line cathode (2) as an electron beam source, a vertical focusing electrode +a+, t:4+, a vertical deflection electrode (4), and an electron beam flow control. It is composed of an electrode (5), a horizontal focusing electrode (6), a horizontal deflection electrode (7), an electronic acceleration electrode (8), and a screen plate (9), which are made of flat glass pulp. (not shown) is housed inside an evacuated interior. Line cathode as an electron beam source (2)
is stretched horizontally so as to generate an electron beam distributed linearly in the horizontal direction, and a plurality of such linear cathodes (2) are arranged vertically at appropriate intervals [here, (2a) to
Only the four trees in (2d) are shown].

In this embodiment, there are 15 cherry blossoms, which are referred to as (2a) cherry blossoms 20). These wire cathodes (2) are constructed by coating the surface of a tungsten wire with a diameter of 10 to 20 μm with an oxide cathode material. Then, as will be described later, the electron beams are controlled to be emitted sequentially from the upper line cathode (2a) for a fixed period of time.

The back electrode +11 creates a potential gradient between it and the vertical focusing electrode (3), and is controlled to emit electron beams for a certain period of time from other line cathodes (2). It works to suppress the generation of electron beams and push out the generated electron beams only in the forward direction.

This back electrode ill may be formed by a coating film of a conductive material adhered to the inner surface of the rear wall of the fucolas pulp. Further, a planar electron beam emitting cathode may be used in place of the back surface type 1ml and the line cathode (2).

The vertical focusing electrode (3) is composed of a conductive plate (river) with horizontally long slits (101) facing each of the line cathodes (2a) (20), and the emitted from the line cathodes (2). The electron beam is taken out through the slit (10) and focused vertically.
0) may have bars provided at appropriate intervals along the way,
Alternatively, the through holes may be substantially configured as slits by a row of a large number of through holes arranged side by side at small intervals in the horizontal direction (intervals such that they almost touch each other). The vertical focusing electrode (a) is also similar.

A plurality of vertical deflection electrodes (4) are arranged horizontally at intermediate positions of the slits (1 (2)), and conductors (+31 , (+A). A vertical deflection voltage is applied between the opposing conductors (+(to) J+8) to deflect the electron beam in the vertical direction.

In this configuration example, the electron beam from one line cathode (2) is vertically deflected to a position corresponding to 16 lines by a pair of conductors Ll order IS. The 16 vertical deflection electrodes (4) constitute 15 conductor pairs corresponding to each of the 15 wire cathodes (2), resulting in 240 horizontal lines on the screen plate (9). Deflect the electron beam as you draw.

Next, the electron beam flow control electrodes (6) are composed of conductive plates (115) each having a long slit (14) in the vertical direction, and a plurality of conductive plates (115) are arranged in parallel in the horizontal direction at a predetermined interval. . In this configuration example, 320 control electrode conductive plates (15a) to (1sn) are provided (only 10 are shown in the figure). This electron beam flow control electrode 1
5), each divides the electron beam horizontally into one picture element and extracts it, and controls the amount of the electron beam passing in accordance with the video signal for displaying each picture element. Therefore, if 320 electron beam flow control electrodes (5) are provided, 320 pixels can be displayed per horizontal line. In addition, in order to display images in color, each picture element is R,
Display is performed using phosphors (7) of three colors, G and H, and the R, G, and H image signals are sequentially applied to each electron beam flow control electrode (6).

Further, 320 sets of video signals for 1 line are simultaneously applied to the 320 electron beam flow control electrodes (5), and the video for 1 line is displayed at one time.

The horizontal focusing electrode (6) has a plurality of vertically long electrodes (3) facing the slit (14) of the electron beam flow control electrode (5).
It is composed of a conductive plate (17) having 20 slits and focuses the electron beams of each picture element divided horizontally into a narrow electron beam.

The horizontal deflection electrode (7) is composed of a plurality of conductive plates arranged vertically in the middle of each of the slits (16), and a horizontal deflection voltage is applied between each conductive plate. Then, the electron beams for each picture element are deflected in the horizontal direction, and the R, G, and H phosphors are sequentially irradiated on the screen plate (9) to cause them to emit light. In this embodiment, the deflection range is the width of one picture element for each electron beam.

The electron beam accelerating electrode (8) consists of a plurality of conductive plates (1) provided horizontally at the same position as the vertical deflection electrode (4).
9), which accelerates the electron beam with sufficient energy so that it collides with the screen plate (9).

The screen plate (9) is coated with a phosphor (20) that emits light when irradiated with an electron beam on the back side of the glass plate CD.
Further, a metal back layer (not shown) is added. Fluorescent material (increased is R, G, H
A pair of phosphors in each of the three colors are provided, and are coated in vertical stripes. The broken lines drawn on the screen plate (9) in FIG.
The dashed dotted lines indicate horizontal divisions displayed corresponding to each of the plurality of electron beam flow control electrodes (5). As shown in the enlarged view in Figure 2, one section divided by these two has R, G, and B phosphors (A) for one pixel in the horizontal direction, and in the vertical direction, It has a width of 16 lines. The size of one section is, for example, 1111% in the horizontal direction and 161% in the vertical direction.

Note that in FIG. 1, the length in the horizontal direction is greatly expanded relative to the length in the vertical direction to make it easier to read.

In addition, in this configuration example, one electronic current control electrode (5
) In other words, only one pair of R, G, and B phosphors 120) is provided for one picture element for one electron beam.
Of course, two or more pairs for two or more picture elements may be provided, and in that case, R, G, and B video signals for two or more picture elements are sequentially applied to the electron beam flow control electrode (6). is,
Horizontal deflection is performed in synchronization with this.

Next, the basic configuration of a drive circuit for displaying television images on this display element will be described with reference to FIG. 3.

First, the driving part for irradiating the screen plate (9) with an electronic beam to cause the phosphor 1'2 to emit light and generate a raster will be explained.

A power supply circuit (also referred to as a circuit for applying a predetermined bias voltage (operating voltage) to each electrode of a display element;
-v1, vertical focusing 'fl pole +:+)] Ic
it Y3 +Vj, horizontal focusing electrode (6) v6, electron beam accelerating electrode (8) v8, screen plate (9)
A DC voltage of v9 is applied to.

Next, a composite video signal of a television and three signals is applied to the input terminal, and a vertical synchronizing signal V and a horizontal synchronizing signal H are separated and extracted in a synchronization separation circuit (to). The vertical drive pulse generation circuit (2) is composed of a counter that is reset by a vertical retrace pulse and counts horizontal pulses, and it is used for an effective vertical scanning period (here, 240 minutes) excluding the vertical retrace period of the vertical period. 16f sequentially during the period of
(15 driving pulses of each period length [A, []-・
...Y] is generated. This drive pulse [A, 0...
...] is applied to the line cathode drive circuit (a), where it is inverted so that it is at a low potential only during each pulse period and at a high potential of about 20 volts during the rest of the pulse period. The pulses are converted into pulses [a, 6...a] and applied to each line cathode (2m) (2b)...(20).

A current is passed through each wire i (2m)...(20) during the high potential period of the drive pulse [I to G], and also during the low potential period of the drive pulse [I to I]. The heated state is maintained so that electrons are emitted. As a result, each of the 15 line cathodes (2a) to (2G) is driven at a low potential.
Electrons are emitted only during the 16H period when Rus [I-GO] is added. During the period when a high potential is applied, the potential at the position of the line cathode (2) determined by the bias voltage applied to the back electrode (1) and the vertical focusing electrode (3) is Since the high potential applied to 2a) to (20) is positive, the line cathodes (21) to (2a) to (20) are positive.
20), no f'i electrons are emitted. Thus, in the line cathode (2), during the effective vertical scanning period, electrons are sequentially emitted from the upper line cathode (2a) to the lower line cathode (20) for each period of 16f. The electrons are pushed forward by the back electrode ill, pass through the opposing slit +lot of the vertical focusing electrode (3),
It is vertically focused to form a planar electron beam.

Next, the vertical deflection drive circuit (rarely the vertical drive pulse [A~3
], and a conversion circuit that converts the count output into D/A, etc., between the 16H intervals of each vertical drive pulse [I to Y]. A pair of vertical deflection signals v and v' that change in 16 steps are generated. The vertical deflection signals V and V' both have a center voltage of v4, and V increases sequentially and V/ decreases sequentially. They are designed to change in opposite directions as they move forward.
The deflection signals V and V' are respectively applied vertically to the conductors 031L15) of the deflection electrodes (4), so that the electron beams generated from the respective line cathodes (2a) and machine 2o) are vertically As mentioned above, on the screen plate (9), the raster is deflected so that 16 lines of raster are sequentially drawn by 1/r from the top using one electronic system.

As a result of the above, 15 fa 1m M (2a)” (2o
), and each electron beam is sequentially deflected by one line from the top to the bottom within 15 sections in the vertical direction. Then, the electronic film is vertically deflected one by one from the 1st line at the top to the 240th line at the bottom, and a total of 240 lines are drawn.

The electron beam thus vertically deflected is divided into 320 sections in the horizontal direction by the electron beam flow control electrode (5) and the horizontal focusing electrode (61) and is extracted.

Figure 1 shows one of these categories.

This electron beam is passed through the electron beam flow control electrode (
5), the amount of light passing is controlled by the horizontal focusing electrode (61), and the beam is focused horizontally into a single thin electronic beam, which is then deflected horizontally in three stages by the horizontal deflection means (described below) to form a screen. The R, G, and H phosphors on the plate (9) are sequentially irradiated.

In other words, the horizontal drive pulse generation circuit @ is composed of three cascade-connected monostable multivibrators, etc., and is triggered by a horizontal synchronization signal to generate three horizontal drive pulses with equal pulse widths within one horizontal period. Generate r, g, b. Here, as an example, three pulses r, g, and b are generated during an effective horizontal scanning period of 50 microns, with each pulse width being about 17 microns. These horizontal drive pulses r, g, b are applied to the horizontal deflection drive circuit (support).

This horizontal deflection drive circuit (8 is horizontal drive pulse r, g, b
A pair of horizontal deflection signals RI and h' which are switched in three stages are generated. Horizontal deflection signal h'
Both have a center voltage of v7, h increases sequentially,
h' change in opposite directions so as to decrease sequentially. These horizontal deflection signals, h', are respectively applied to the conductive plates (I barrel and u4) of the horizontal deflection electrode (7).As a result, each horizontally segmented electron beam is transferred to the screen plate during each horizontal period. (9) R, G, H phosphors in sequence
It is horizontally deflected so that 7P are irradiated at a time.

Thus, in each line raster, the horizontal 3
An electron beam is sequentially irradiated onto each of the R, G, and H phosphors in each of the 20 sections.

Therefore, for each horizontal section of each line, the electron beams are
, H video signals, a color television image can be displayed on the screen board (9).

Next, the modulation control portion of the electron beam will be explained.

First, the composite video signal applied to the television signal input terminal (73) is applied to the color demodulation circuit
The Y and B-Y color difference signals are demodulated, the G-Y color difference signals are matrix-synthesized, and further, they are combined with the luminance signal Y to form R, G, and H primary color signals (hereinafter referred to as R, G , B
(referred to as a video signal) is output. These R, G, and B video signals are processed by 320 sets of sash hold circuits (31 m
)” (31n). Each sample-and-hold circuit group (31K) (Sakura 31n) has three sample-and-hold circuits for R, G, and B. These sample-and-hold circuit groups ( The sample hold outputs of 31&) to (31n) are respectively applied to the holding memory set (32m) to (32n).

On the other hand, the reference oscillator for sampling PLL
(Phase 0 checked loop) circuit, etc., generates a 0 check based on a standard of approximately 6.4 MH in this embodiment. The reference D is controlled to always have a constant phase with respect to the horizontal synchronizing signal H. This reference zero is applied to the sampling pulse generation circuit 04), where it is delayed by one period of the zero by a shift register, etc., so that the effective horizontal scanning of the horizontal period (63,5μ9B:,) 320 sash printer pulses aM are generated sequentially during a period (approximately 50μ), and then 1
transfer pulses are generated. This sampling pulse &''-'II corresponds to each picture element when one line of the video to be displayed is divided horizontally into 320 picture elements, and its position is always constant with respect to the horizontal synchronizing signal H. controlled so that

These 320 sampling pulses a (are respectively
1n), and as a result, the R, G, and B video signals of each picture element when one line is divided into 320 picture elements are individually input to each sample and hold circuit set (31a) and Sakura (32n). It is linked to and held. After the 320 sets of sample-held R, G, and B video signals are sampled and held for one line, they are transferred all at once to the 320 sets of memories (32m) (32n) by a transfer pulse t, where they are transferred to the next horizontal line. Retained for the duration of the scan.

The R, G, and B video signals for 1 line held in the memories (32m) (32n) are applied to 320 switching circuits (35a)'' (35n), respectively.The switching circuits (35m) to (35n) are Each is R, G, B
(7) It has individual input terminals and a common output terminal that sequentially switches and outputs them, and each switching circuit (
The outputs of the electron beam flow control electrodes (35m) to (351) of the display element are used as control signals for modulating the electron beam.
5) are individually added to the 320 conductive plates (15 m) to (tsn). Each switching circuit (35m)
(35n) is simultaneously switched and controlled by a switching pulse applied from a switching pulse generating circuit (exposed).

The switching pulse generation circuit is controlled by the pulses r, g, and b from the horizontal drive pulse generation circuit (to), and the effective horizontal scanning period of each horizontal period is about 50μ (8
) is divided into three switching circuits (35 m
)"-(35n), and time-divide the R, G, and H video signals and output them alternately and sequentially, and conductive plate (15a)"-(
15n) to generate switching signals r, g, and b.

What should be noted here is that the switching circuit (35a)
~(35n) R, G, and B's death video message-17) Companion M
R of electron beam by switching and horizontal deflection drive circuit J
, G, and B are synchronously controlled so that the horizontal deflections for switching the irradiation to the phosphors are completely coincident both in timing and order. Accordingly, when the electron beam is irradiating the R phosphor, the irradiation amount of the electron beam is controlled by the R video signal, and the G and H are similarly controlled, so that the R and H of each picture element are controlled in the same manner. The light emission of each of the G and B phosphors is controlled by the R, G, and B video signals of the picture element, and each picture element is displayed by emitting light in accordance with the input video signal. Such control is performed simultaneously on 320 picture elements for one line to display one line of video, and then sequentially performed on 240-minute lines starting from the upper line to display one video on the screen board (9). will be displayed.

The above-mentioned operations are repeated for each field of the input catenary vision signal, and as a result, a moving television image is projected on the screen board (9) in the same way as in a normal television receiver. .

As described above, television images are displayed on this display device.

Note that the terms horizontal direction and vertical direction in the above explanation refer to the direction in which line units are displayed when displaying an image is the horizontal direction, and the direction in which the lines are stacked is the vertical direction. It is used in this sense, and is not directly related to the vertical and horizontal directions on the actual screen.

Next, regarding the alignment device in one embodiment of the present invention,
This will be explained using FIGS. 4 to 6. Fig. 4 is a longitudinal sectional view of the display device being adjusted by the alignment device, Fig. 5 is a sectional view taken along line A-A in Fig. 4, and Fig. 6 is an enlarged sectional view of the main part of Fig. 5. In Figures 4 to 6, (37
a) is a container, (37b) is a face container, (c) is an electrode socket, (39) is a band for screws, (40a) (40
d) is the terminal, (41a) and (41e) are the embedded fixing pins, (42m) and (42c) are the springs.
is the screw, i11 is the fluorescent surface, and the surface is the space inside the hero. #J notation D-Zoke 3) is made of a metal having substantially the same coefficient of expansion as the container (37&) and the face container (37b), and closes the hole in the container (37m). Fixed in condition.

The electrode block (c) of the above-mentioned flat plate image device was placed in close contact with the fluorescent surface (37m) coated on the face container (37b) in order to align it with the fluorescent surface coated on the face container (37b).
Yoshi container (37&) and face container (37b
) Completely separate the inside and outside air, and move the electrode block ■ by pushing the inner surface of the screw band (A). ) may be provided independently at four locations without the band being laid down.

In addition, the bead is welded to the container (37B) or
Can be easily sealed and bonded with low-temperature powder glass adhesive (frit). In this embodiment, alignment is performed using four adjustment mechanisms, and after alignment is completed, only the screw (44) is
Alternatively, remove the screw band (T) and
The inner space (46) is filled with a resin adhesive or the like and fixed.

In this embodiment, the amount of adjustment is 100''700 μm or less, and industrially, it is also possible to display an image, measure the position of P, and perform υ alignment using an automatic machine.

In addition, as in the above embodiment, the screw -→ is connected to the container (37a).
It is also possible to align the position by providing an adjustment mechanism such as a screw on an external jig without fixing it to the external jig, and then fix it by filling the inside of the bead with a resin adhesive or the like.

As described in detail, according to the present invention, the following effects can be obtained.

■Since positioning can be adjusted later, the rate of defective products can be significantly reduced.

■Reduces the need to process highly accurate parts for positioning.

■Measures to prevent misalignment due to differences in expansion coefficients when temperature rises and complicated structures can be eliminated.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing the basic configuration of an image display element of an image display device as an example of a target for which the alignment device of the present invention is used, FIG. 2 is an enlarged view of the screen, and FIG. 3 is an enlarged view of the device. FIG. 4 is a block diagram showing the basic configuration of the drive circuit, FIG. 4 is a vertical cross-sectional view of an image display device being adjusted by an alignment device according to an embodiment of the present invention, and FIG.
A sectional view taken along line A, and FIG. 6 is an enlarged view of the main part of FIG. 5. (37a)...Container, (37b)...Face container, (To)...Electrode screw, (39)...Screw band, ('40a) (40d), One terminal, ( 41a)
-(41e) ・! i theorem embedded pin, (42m)-(
426)--Spring, h31--BeD-zu, (441
-Screw, m-*Light body, 14(2)...Space agent within bellowsYoshihiro MorimotoFigure 4Figure 1-7 2'' Figure R

Claims (1)

[Claims] 1. A bead made of metal and having an expansion coefficient matching that of the material of the container, which is tightly fixed to a container filled with a vacuum or low-pressure special gas in a state where the hole in the container is closed, and this bead D. - adjustment means for moving and positioning a structure inside the container from outside of the container via a lens.