JPS6057749B2 - projection receiver - Google Patents

Description

Detailed Description of the Invention The present invention is a projection type receiver in which an electron beam from an electron gun is emitted to a fluorescent surface structure to emit image light, and this image light is reflected by a reflecting mirror and projected onto a projection screen. It is related to.

As shown in FIG. 1, the projection receiver includes an electron gun 1, a fluorescent surface structure 2 that is excited by the electron beam emitted from the electron gun 1 and emits colored light, and a fluorescent surface structure 2 that emits colored light. A reflecting mirror 3 that reflects the light emitted by the surface structure 2 to the outside, a glass container 4 that houses these, and the reflecting mirror 3 constitute a Schmitt lens system, and correct the spherical aberration of the reflecting mirror 3. It consists of a correction lens (Schmitt lens) 6.

A color image is obtained by emitting red, green, and blue light from each of the three projection type receivers, and combining the images from each receiver on the projection screen 5. Incidentally, the projection distance between the correction lens 6 and the projection screen 5 is uniquely determined by the positional relationship between the fluorescent surface structure 2 and the reflecting mirror 3.

However, when creating a color image by combining three single receivers positioned in this way, it is difficult to ensure that the three color images are superimposed unless the relative positions of the three are accurately determined. This will result in poor image quality. Furthermore, when one of the picture tubes of a completed projection picture receiver is replaced due to a failure or the like, the adjustment with the other two picture tubes becomes complicated, making after-sales service of the product difficult. The present invention solves the above-mentioned problems by providing a flexible transparent plate in the correction lens, filling the space between them with a fluid substance, and deforming the flexible transparent plate, so that each projection type image receiving To provide a projection receiver that matches the projection distance between the projector and the projection screen, eliminates manufacturing errors, improves image quality, and facilitates replacement of specific projection receivers. be.

The present invention will be explained below based on examples together with drawings.

FIGS. 2a and 2b are sectional views showing the main parts of an embodiment of the projection receiver of the present invention, in which the correction lens 6 is fitted into the groove 8 of the support cylinder 7, and In the provided groove 9, a flexible transparent flat plate 10 that is easily deformed, such as a transparent acrylic plate or a thin glass plate, is installed. A fluid substance 11 having a refractive index as high as that of the correction lens 6 is filled between the correction lens 6 and the flexible transparent flat plate 10 . The fluid substance 11 is, for example, a transparent material made of unsaturated polyester material,
Examples include substances used in PG and the like. A substance reservoir 14 communicating with the air hole 12 and the injection hole 13 is formed in the thick part of the support cylinder 7 . Furthermore, a female thread is cut in the center of the flexible transparent flat plate 10, and a male thread 15 is fitted to this female thread. Therefore, according to the correction lens 6 having such a configuration, by rotating the male screw 15, the flexible transparent flat plate 10 can be removed as shown in FIG. 2b.
The substantial thickness of the correction lens 6 can be increased by causing the correction lens 6 to protrude and deform to the side opposite to the correction lens 6 and supplying the fluid substance 11 between the correction lens 6 and the transparent plate 10.

After attaching the above projection type receiver to the projection device, when adjusting the projection distance using the male screw 15 for adjusting the unevenness, the difference in the unevenness of the transparent plate 10 of 0.17 m corresponds to about 10 cm of the projection distance, which is extremely Effective adjustment becomes possible.

Note that in a projection system having a Schmitt lens system, only a small amount of light passes through the center of the correction lens 6, so even if a deforming means such as a screw 15 is provided in the center of the transparent plate 10, there is no loss of luminous flux.

In addition, parts such as the screws 15 are made of black material to prevent reflection and scattering of light, and are made to have a light-absorbing effect. FIG. 3 is a cross-sectional view showing another embodiment of the present invention, in which the groove 9'' into which the transparent plate 1' is fitted is oriented toward the correction lens 6 side compared to the one shown in FIGS. 2A and 2B. Therefore, the transparent plate 1' is installed so as to protrude toward the correction lens 6 side.

In this embodiment, since the transparent plate 1'' is installed protruding toward the correction lens 6 side, the displacement of the transparent plate 1'' due to the rotation of the screw 1 is larger than that shown in FIG. 2a. This increases the adjustment range of projection distance.

FIG. 4 is a cross-sectional configuration diagram of main parts showing another embodiment of the present invention,
A screw 16 is installed in the support tube 7 as a deforming means.

The tip of the screw 16 is located at the center of the correction lens 6, and a rotating piece 17 is provided at the tip to allow the transparent plate 10 to protrude to the side opposite to the correction lens 6 by the rotational force of the screw 16. In this embodiment as well, the substantial refractive index of the correction lens 6 can be easily changed.Furthermore, by installing the transparent plate 10 so as to protrude toward the correction lens 6, it can be used over a wide range. The projection distance can be adjusted.As explained above, since the present invention includes a flexible transparent plate and a deforming means for deforming the transparent plate, supply of the fluid substance can be performed by adjusting the deforming means. The refractive index of the correction lens can be substantially changed depending on the amount, and the projection distance can be easily adjusted.
To easily and reliably adjust the superposition of three images.

Furthermore, even when a specific receiver of a completed projection type receiver is replaced, the projection distance relative to other receivers can be easily adjusted, making it easier to provide after-sales service for the product.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram of the projection type image receiving device, Figure 2 A, bl 3
4 are sectional views showing essential parts of each embodiment of the projection type receiver of the present invention. 1... Electron gun, 2... Fluorescent surface structure, 3
...Reflector, 4...Glass container, 5.
...Projection screen, 6 ... Correction lens, 7 ... Support cylinder, 8 ... Correction lens groove, 9,9'' ... Transparent plate Groove, 10,10″...
... Flexible transparent plate, 11 ... Fluid substance, 1
4... Material reservoir, 15, 16... Screw.

Claims (1)

[Claims] 1. An electron gun, a fluorescent surface structure that receives an electron beam from the electron gun and emits light, a reflecting mirror that reflects the light emitted by the fluorescent surface structure to the outside, and corrects the spherical aberration of the reflecting mirror. In a projection type receiver equipped with a correction lens, the correction lens is provided with a flexible transparent plate, a fluid substance is filled between the correction lens and the flexible transparent plate, and a deforming means is used to A projection type receiver characterized by deforming a flexible transparent plate.