JP3136542B2 - Light emitting element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light emitting device constituting a pixel of a large screen color display device.

[0002]

2. Description of the Related Art FIG. 2 shows a basic structure of a display tube for a light source as a conventional light emitting element of this kind, for example.
3B is a plan view, FIG. 3B is a cross-sectional view taken along line AA 'of FIG.
Is an exploded perspective view of the multi-cell, in which the number of pixels is a phosphor screen having R (red), G (green), and B (blue) phosphors as one pixel, and the phosphor is arranged in a matrix of 3 × 3 pixels. A light source display tube of the type will be described. In FIG. 1, reference numeral 1 denotes a vacuum envelope as a glass tube hermetically sealed by a front panel 2, a rear panel 3, and a cylindrical side plate 4. On the inner surface of the front panel 2, a three-color phosphor R, Each of G and B is applied and arranged in a matrix form as a unit pixel, and a fluorescent display unit 5 including fluorescent screens 5R, 5G, and 5B of 3 × 3 pixels is formed. Here, the fluorescent screen 5R,
Subscripts of 5G and 5B correspond to red (R), green (G), and blue (B), respectively. Reference numeral 6 denotes an anode electrode group consisting of a plurality of acceleration anodes 6 ₁ , 6 _2, ... Arranged corresponding to the periphery of each of the fluorescent screens 5 R, 5 G, 5 B of the fluorescent display unit 5. A high voltage is applied to the anodes 6 ₁ , 6 ₂ . Reference numeral 7 denotes a cathode electrode group in which electron emitting cathodes 7 _{11 to} 7 ₃₃ (not shown) are independently arranged corresponding to the respective fluorescent screens 5R, 5G, 5B of the fluorescent display unit 5. cathode 7 _{11-7 33} each both ends are supported between a pair of support fixed on the rear panel 3. Wherein the first cathode 7 _{11-7 33,} first to third row second subscripts respectively correspond to the first to third column. In addition,
Each cathode 7 _{11-7 33,} for example, a straight thermal coated with oxide oxide coated indirectly heated or tungsten on the Ni sleeve can be used.
Also, 8 is a grid electrode group composed of a control grid 8 _{1-8 3} for arrangement row selection between the cathode electrode group 7 and the fluorescent display portion 5, these control grids 8 ₁
8 _3, each fluorescent screen 5R, 5G, electron passage holes so as to pass through the electron beam 11 than the cathode 7 _{11-7 33} respectively to the row direction corresponding to 5B as a non-focused beam of fluorescent display 5 9 _to 93 ₃ are provided. Reference numeral 10 denotes a fluorescent surface 5R, 5R of the fluorescent display unit 5 on the back side of the cathode electrode group 7, that is, on the back panel 3 forming a part of the vacuum envelope 1.
G, a back electrode group comprising a back electrode 10 ₁ to 10 ₃ for each oppositely disposed striped column selection to the column direction in response to 5B, these back electrode 10 ₁ to 1
O ₃ is formed from a conductor layer such as Ag. Each of the back electrodes 10 ₁ to 10 ₃ is connected to each of the cathodes 7 _{11 to} 7.
By applying a positive potential of the negative and 0V or several V with respect to ₃₃ of the potential, which is intended to control the electron beam 11 to be emitted from their cathode 7 _{11-7 33.} Reference numeral 12 denotes a lead pin serving as an external terminal for extracting each electrode such as the cathode electrode group 7, the grid electrode group 8, and the back electrode group 10 from the back panel 3 to the outside. The lead pin 12 is embedded in the back panel 3. As shown in the side view of FIG. 4 (a), it is formed on the peripheral surface of the socket 13 fixed to the back surface of the back panel 3 and fitted into the groove 14. This socket 1 is electrically connected to the electrode terminals 15 and
3 is connected to the electric circuit. In addition, 16 is the cylindrical side plate 4
And a frit seal for joining the front panel 2 and the rear panel 3 together.

[0003]

However, in the conventional display tube for a light source, as shown in an enlarged plan view of a main part in FIG. 4B, the back panel 3 and the socket 13 are brought into close contact with an adhesive (not shown). Since it is configured to be fixed by bonding,
Difference in thermal expansion coefficient between back panel 3 made of a glass substrate and socket 13 made of a polymer resin or back panel 3
The lead pin 1 pulled out through the back panel 3 due to thermal expansion of an adhesive for bonding the lead pin 1 to the socket 13.
No. 2 has a problem that a stress is generated at a root portion thereof, and as a result, minute cracks are apt to be formed at the root of the lead pin 12 of the rear panel 3. The occurrence of the cracks has been a fatal problem for the light emitting element, such as breaking the vacuum envelope 1 in a vacuum in an extreme case. That is, since this kind of display tube for a light source is used in a wide temperature range of 340 ° C. to 100 ° C., countermeasures against the occurrence of stress due to the difference in the thermal expansion coefficient of the constituent members are extremely important issues. Was.

Accordingly, the present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to absorb the generation of stress due to the difference in the thermal expansion coefficient of the constituent members, and to use the ambient temperature range. It is an object of the present invention to provide a light emitting element which can enlarge the size of the light emitting device.

[0005]

In order to achieve the above object, a light emitting device according to the present invention is connected to a lead pin.
A gap is provided between the electrode terminal and the side wall of the recessed groove of the socket .

[0006]

In the light emitting device according to the present invention, the lead pin
A gap is provided between the electrode terminal connected to the socket and the side wall of the concave groove of the socket, and the electrode terminal is arranged so as to be freely fitted, so that the stress generated at the root portion of the lead pin is absorbed.

[0007]

Embodiments of the present invention will be described below in detail with reference to the drawings. 1A and 1B are cross-sectional views of a main part showing a configuration of a light emitting device according to an embodiment of the present invention. FIG. 1A is a plan view of a main part showing a configuration of a socket portion, and FIG. A-
It is sectional drawing of the A 'line, and the same code | symbol is attached | subjected to the same part as the above-mentioned figure, and the description is abbreviate | omitted. In the figure, a plurality of concave grooves 14 are provided along the length direction of the lead pins 12 on the outer surface of the socket 13 which is fixedly attached to the back panel 3 with an adhesive (not shown). In each groove 14, an electrode terminal 15A is formed to be smaller than the side wall of the groove 14 by a dimension d, and is loosely fitted in the frame of the groove 14 with a dimensional allowance in the length and width directions. It is arranged freely. The lead pin 12 is electrically connected to and electrically connected to the electrode terminal 15A at a point P by, for example, spot welding.

According to such a configuration, the lead pin 12
The electrode terminal 15A to which the back panel 3 and the socket 13 have a thermal expansion coefficient difference between the rear panel 3 and the socket 13 is freely fitted with a dimensional allowance in the length and width directions within the frame of the concave groove 14. Alternatively, the stress generated by the thermal expansion of the adhesive is absorbed by the dimension d between the dimension in the frame in the concave groove 14 and the outer diameter dimension of the electrode terminal 15A. No stress is generated, and thus no cracks are generated.

[0009]

As described above, according to the present invention,
Electrode terminal connected to the lead pin and the concave groove side of the socket
By providing a gap between the wall and the electrode terminals so that they can be freely fitted, the stress generated by the difference in the coefficient of thermal expansion between the back panel and the socket or the thermal expansion of the adhesive between the back panel and the socket Is absorbed, so that cracks are less likely to occur at the roots of the lead pins on the rear panel. Therefore, all the problems caused by the cracks are solved, and the environmental temperature range to be used is greatly expanded, and the quality and reliability are improved. It has extremely excellent effects such as obtaining a high light emitting element.

[Brief description of the drawings]

FIG. 1A is a plan view of a main part of a socket portion showing a configuration of a light emitting device according to an embodiment of the present invention, and FIG. 1B is a cross-sectional view taken along line AA ′.

2A is a plan view showing a basic configuration of a conventional light source display tube, and FIG. 2B is a cross-sectional view taken along the line AA '.

FIG. 3 is an exploded perspective view of a part of FIG. 2;

FIG. 4A is a plan view of the configuration of a conventional light source display tube socket viewed from the side, and FIG. 4B is an enlarged plan view of a main part showing the socket portion.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Vacuum envelope 2 Front panel 3 Back panel 4 Cylindrical side plate 5 Fluorescent display part 6 Anode electrode group 6 ₁ Acceleration electrode 6 ₂ Acceleration electrode 6 ₃ Acceleration electrode 7 Cathode electrode group 8 Grid electrode group 10 Back electrode group Reference Signs List 11 electron beam 12 lead pin 13 socket 14 concave groove 15A electrode terminal 16 frit seal 20 external terminal

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuji Kamogawa 700, Ueda-cho, Ise-shi, Mie Prefecture Inside Ise Electronics Industry Co., Ltd. Inside Ise Electronics Industry Co., Ltd. (72) Inventor Zenichiro Hara 6-14 Maruo-cho, Nagasaki City, Nagasaki Prefecture Mitsubishi Electric Corporation Nagasaki Works (72) Inventor Shunichi Nishiishi 6-14 Maru-cho, Nagasaki City, Nagasaki Prefecture Mitsubishi (72) Inventor Norihiro Ichikawa 6-14 Maruo-cho, Nagasaki City, Nagasaki Prefecture Mitsubishi Electric Corporation Nagasaki Works (56) References JP-A-2-192652 (JP, A) JP-A-4 −174956 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01J 31/12

Claims (1)

(57) [Claims] 1. A vacuum envelope having a front panel on the front side of a cylindrical side plate, a rear panel on the back side, and a rear panel hermetically bonded with low-melting glass, and a matrix inside the vacuum envelope on the inner surface of the front panel. and formed phosphor screen, the lead pin the corresponding to the phosphor screen provided a control grid for controlling the flow of arranged electron emission for the cathode and electrons to the back panel side, it was removed from the back panel to the outside Connected to
In the light-emitting element and the electrode terminals are fitted placed in the recessed groove formed in the socket attached to the rear surface of the rear panel is connected to the socket inside the path that is, with the electrode terminal
A light emitting device, wherein a gap is provided between the groove and a side wall of the groove .