JPS6213783B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention uses a correction lens as a face plate for correcting spherical aberration of a spherical reflecting mirror,
The present invention relates to a method of manufacturing a projection picture tube in which a phosphor film is attached to the inner surface of the face plate.

Utility Model Application No. 53-66089 (Utility Model Application No. 54-167618) devised a projection type picture tube using a correction lens, which is a meniscus lens, as a face plate.
To explain this with reference to FIG. 1, a face plate 1 which also serves as a meniscus lens has a transparent conductive film 2 and a phosphor film 3 attached to its inner surface, and a glass solder layer 4 made of fritted glass is attached to the face plate 1. A spherical reflecting mirror 6 is enclosed within a funnel 5 which is hermetically sealed through the funnel 5.

In a projection picture tube having such a configuration, a modulated electron beam 7 emitted from an electron gun (not shown) and subjected to a deflection action scans the phosphor film 3, thereby forming a predetermined pattern on the phosphor film 3. An image is projected, and this image is reflected by the spherical reflecting mirror 6, transmitted through the transparent conductive film 2 and the face plate 1, and then enlarged and projected onto a screen (not shown) provided in front of the picture tube. For this purpose, so-called focusing is required in which the mutual distance between the face plate 1 and the spherical reflecting mirror 6 is set to a predetermined value.

The focusing is performed by adjusting the position occupied by the spherical reflecting mirror 6 by moving it forward or backward using screws 8, taking into consideration the thickness of the glass solder layer 4, before sealing the face plate 1 and the funnel 5. It is difficult to accurately regulate the thickness of the solder layer 4 without variations, and this results in variations in the mutual spacing, making it difficult to perform accurate focusing.

The present invention has been made to eliminate the above-mentioned conventional disadvantages, and will be described in detail below with reference to embodiments shown in the drawings.

In FIGS. 2 and 3, a face plate 10 that also serves as a meniscus lens is sealed to one open end surface of a glass cylinder 11 via a glass solder layer 12 made of fritted glass. A phosphor film 20 is attached via a transparent conductive film 19. In addition, four pins 1 are formed protruding from the inner surface of the glass cylinder 11.
3 is engaged with one end of a spring piece 14 for holding a spherical reflecting mirror. However, 4 spring pieces 1
At the other end of 4, a spherical reflector 1 is installed outside the glass cylinder 11.
5 is temporarily fixed with screws 16.

In this assembled state, the screws 16 are located outside the glass cylinder 11 and the funnel 17 is not yet sealed, so loosen the screws 16 to adjust the optical distance between the face plate 10 and the spherical reflector 15 It becomes possible to adjust the positional relationship to a predetermined value extremely accurately. After this adjustment, the spherical reflector 15 is firmly fixed to the other end of the spring piece 14 with screws 16, and then a funnel 17 is attached to the other open end surface of the glass cylinder 11 with a glass solder layer 18 made of fritted glass. Seal airtight.

As described above, according to the method of manufacturing a projection picture tube of the present invention, a face plate consisting of a correction lens provided with a phosphor film is sealed to one open end surface of the glass cylinder, and the inner surface of the glass cylinder is sealed. A spherical reflector is moved and screwed to the other end of the spring piece, one end of which is engaged with a pin formed protruding from the glass cylinder body, and the other end of which protrudes outside the glass cylinder body. Since the funnel is sealed to the other open end surface of the glass cylinder, it is easy to set the optical positional relationship between the face plate and the mirror surface to a predetermined value regardless of variations in the thickness of the glass solder layer. , manufacturing yield can be improved.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a part of a conventional projection picture tube, FIG. 2 is a perspective view of the main part of a projection picture tube in which the present invention is implemented, and FIG. 3 is a side sectional view of the main part of the picture tube. It is a diagram. 10...Face plate, 11...Glass cylinder body,
13...pin, 14...spring piece, 15...spherical reflector,
16...Bis, 17...Funnel.

Claims (1)

[Claims] 1. A face plate consisting of a correction lens provided with a phosphor film is sealed to one open end surface of a glass cylinder, one end is engaged with a pin protruding from the inner surface of the glass cylinder, and the other end is sealed. A spherical reflecting mirror is moved and adjusted and screwed to the other end of the spring piece whose portion protrudes outside the glass cylinder, and then a funnel is sealed to the other open end surface of the glass cylinder. A method for manufacturing a characteristic projection picture tube.