JPH07181901A - Plane type image forming device - Google Patents

Abstract

PURPOSE:To simplify the operation and to improve the yield by using a glass frt contg. spherical bodies having a uniform diameter and high softening temp. in the sealing part of an image forming device. CONSTITUTION:A rear plate 1 which is substrate on which many pieces of surface transmission type electron releasing elements are arranged, and having parts for taking out wirings to the outside, a frame of an outer peripheral part and a face plate 6 provided with a fluorescent surface are adhered via the glass frit 4 in this order and are vacuum sealed. The spherical bodies 5 having the diameter larger than the difference in level of the wirings 2 and having the uniform diameter are dispersed into the glass frit 4. The softening temp. of the spherical bodies 5 dispersed in the glass frit 4 is required to be higher than the softening temp. of the glass frit 4. Then, the degradation in distance accuracy and parallel accuracy by the difference in level of the wirings 2 and/or a variation in the thickness of the glass frit of the case the wirings 2 which are formed by a printing method, etc., and have nonnegligible thicknesses is prevented without impairing the airtightness in the adhered parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an image forming apparatus using a surface conduction electron-emitting device.

[0002]

2. Description of the Related Art Conventionally, surface conduction electron-emitting devices (hereinafter referred to as S
(Abbreviated as CE) is, for example, M.I. I. Elinso
n, Radio Eng. Electron Py
s. , 10, (1965) and G.I. Dittmer; Th
in Solid Films, 9, 317 (197)
2), Araki et al .; Vacuum, Vol. 26, No. 1, p. 22 (19
83) and the like have been reported.

A large number of these SCE elements can be arranged on the same substrate, and the self-luminous display device has been developed by utilizing this property. An image forming apparatus, which is a display apparatus in which a large number of SCE elements are arranged and a phosphor that emits visible light by electrons emitted from the electron source are combined, can be relatively easily manufactured even in a large screen apparatus, and It is a self-luminous display device with excellent display quality (USP 5066883).

The main structure of such an apparatus is that a rear plate on which a large number of SCE elements are arranged and a face plate provided with a fluorescent material and the like are hermetically sealed by an outer peripheral frame (herein referred to as a spacer) and a glass frit. In this state, the inside is evacuated to produce an image forming apparatus.

[0005]

However, when used as an image forming apparatus, uniform pixel characteristics are required over a wide area. In an image forming apparatus using an SCE element, it is necessary to maintain high distance accuracy and parallel accuracy when connecting a rear plate on which the SCE element is formed and a face plate on which a phosphor is provided. In the case where the glass frit is used for bonding via the spacer, a complicated and skilled operation is required to achieve such desired accuracy. This is the internal SC
The wiring connected to the E element must be drawn to the outside, and in the case of wiring having a thickness that cannot be ignored with respect to the thickness of the adhesive portion, such as wiring formed by a printing method, variations in wiring step This is because the glass frit is susceptible to the influence and even if the thickness is negligible like the wiring formed by the vapor deposition method, there is the influence of the variation in the thickness of the glass frit.

[0006]

In order to solve the above-mentioned problems, the present invention provides (1) a rear plate which is a substrate having a large number of surface conduction electron-emitting devices arranged and having a wiring lead-out portion to the outside. In an image forming apparatus in which an outer peripheral frame and (3) a face plate provided with a phosphor screen are bonded in this order via a glass frit, and in a vacuum sealed image forming apparatus, Provided is an image forming apparatus characterized in that spheres having a diameter equal to or larger than a step of wiring and having a uniform diameter are dispersed.

In the apparatus of the present invention as described above,
The softening temperature of the spheres dispersed in the glass frit must be higher than the softening temperature of the glass frit.

By using the image forming apparatus as described above, the wiring steps when the wiring is formed by a printing method or the like and has a non-negligible thickness without impairing the airtightness at the bonding portion. And / or it is possible to prevent the distance accuracy and the parallel accuracy from being deteriorated due to the variation in the thickness of the frit glass. Also, even when the wiring is formed by a vapor deposition method or the like, even if the level difference of the wiring is negligible, when the variation in the thickness of the frit glass becomes a problem,
By dispersing the spheres as described above, the influence of the variations can be substantially eliminated.

In this way, it is possible to provide an image forming apparatus which can relatively easily perform highly accurate distance / parallel alignment without using a complicated and skillful technique.

[0010]

【Example】

(Embodiment 1) FIG. 1 is a cross-sectional view of a vacuum partition wall portion of an example of an image forming apparatus of the present invention, which best shows the features of the present invention.

In the figure, 1 is a rear plate and 2 is an S
The wiring 3 connected to the CE element is a spacer between the wiring and the face plate. Rear plate 1 and spacer 3
Are airtightly bonded by 4 glass frit.

Reference numeral 5 is a sphere having a diameter larger than the step of the wiring 2, and the variation of each diameter is suppressed to be smaller than the variation of the step of the wiring 2. By using this sphere 5, the spacer 3 can be held equidistant from the rear plate, and can be substantially unaffected by the step of the wiring 2 and the thickness of the glass frit.

FIG. 2 is a block diagram of a vacuum partition including a face plate of this apparatus.

In the figure, the wiring 2 is formed on the rear plate 1 and is led out to the outside through the glass frit 4 below the spacer 3. A face plate 6 is sealed on the upper portion of the spacer 4, and in this case, it is bonded by a conventional glass frit 4.

FIG. 3 is an overall view of this device including the SCE element.

The face plate 6 is provided with a fluorescent body 7 which emits light by collision of an electron beam and an anode electrode for attracting the electron beam. A large number of SCE elements 9 are provided inside the rear plate 1 surrounded by the spacers 3.
Are arranged and are connected to the outside by the wiring 2. Further, the inside is held in vacuum.

Here, as the material of the glass frit 4,
It is possible to use a known low-melting glass material such as 7570 (Corning Co.), which is commercially available. After sufficiently crushing this glass until the maximum particle size becomes 1 μm or less,
A glass frit paste was prepared by adding nitrocellulose, n-butyl carbitol acetate and the like.

As the spheres 5 added to the glass frit 4, commercially available glass beads having a diameter of 50 μm ± 1 μm were used. This glass bead material needs to have a higher softening temperature than the glass frit material used,
It is preferably 600 ° C. or higher.

The spheres 5 were mixed in a ratio of 30 to 40 per 1 g of the paste containing the glass frit 4, and they were sufficiently kneaded so as to be uniformly dispersed in the entire paste. After this,
Screen printing is performed on the bonding portion shown in FIGS. 1 to 3, and then the paste printed on the upper portion of the wiring 2 is scraped off by a scraper or the like to remove the sphere 5 placed on the wiring 2. Alternatively, a paste containing spheres 5 is applied only between the wirings by using a screen pattern that can be printed only between the wirings 2.

After that, a glass frit paste not containing the spheres 5 is applied by printing onto the portion where the paste containing the spheres 5 is printed and the electrodes, and is similarly applied to the adhesive portion of the face plate 6.

Next, a load is applied so that the upper and lower sides of the sphere 5 are completely brought into close contact with the spacer 3 and the rear plate 1, and drying is performed at 150 ° C. for 60 minutes while maintaining the load.

After that, the temperature is raised to 430 ° C., the temperature is kept for 30 minutes to sinter the glass frit 4, the temperature is slowly lowered to room temperature, and the sealing is completed.

Next, the air inside is evacuated through a pipe provided in a part of the spacer 3 to bring it to a high vacuum state, and the pipe is sealed to form a display portion of the image forming apparatus.

The material of the glass frit 4 and the material of the sphere 5 are not particularly limited to those mentioned in this embodiment, and for example, ceramic beads or the like can be used as the sphere as well as the glass beads.

[0025]

As described above, by using a glass frit including spheres having a uniform high diameter and a high softening temperature in a sealing portion of an image forming apparatus using an SCE element,
It is possible to minimize the influence of the level difference of the wiring and the thickness of the glass frit. As a result, it becomes easy to improve the distance accuracy and the parallel accuracy between the rear plate and the face plate, and it is possible to simplify the work and improve the yield.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of a joint portion of an example of an image forming apparatus of the present invention.

FIG. 2 is a configuration diagram in the vicinity of a joint portion of the device of FIG.

FIG. 3 is a configuration diagram showing an overall configuration of the apparatus of FIG.

[Explanation of symbols]

 1 Rear Plate 2 Wiring 3 Spacer 4 Glass Frit 5 Sphere 6 Face Plate 7 Phosphor 8 Anode Electrode 9 SCE Element 10 Exhaust Pipe

Claims (4)

[Claims] 1. A rear plate, which is a substrate on which a large number of surface conduction electron-emitting devices are arranged and which has a wiring lead-out portion to the outside, (2) a peripheral frame, and (3) a fluorescent screen. In the image forming apparatus in which the formed face plates are bonded in this order through the glass frit and vacuum-sealed, the glass frit has a diameter equal to or larger than the step of the wiring and the diameter is uniform. An image forming apparatus in which spheres are dispersed. 2. The image forming apparatus according to claim 1, wherein the softening temperature of the spheres dispersed in the glass frit is higher than the softening temperature of the glass frit. 3. The image forming apparatus according to claim 1, wherein the wiring is formed by a vapor deposition method. 4. The image forming apparatus according to claim 1, wherein the wiring is formed by a printing method.