JPS6051089A - Projection type television receiver - Google Patents

Abstract

PURPOSE:To make focusing with fingers from outside and to project a clear picture on the receiving set by rotating a ring having a female screw that fits to a male screw provided in a lens barrel. CONSTITUTION:A male screw 30a that advances in the direction of optic axis of a lens and a convex part 31 for stopping the rotation of a lens barrel are provided on the side of a lens barrel 1 that supports a projecting lens of projection block of a projection type TV receiving set, and an operating ring 27 having a female screw 30b that fits to the screw 30a concentrically is inserted in the lens barrel 1. The lens barrel 1 and the ring 27 are inserted in a bracket 29 in which a operating ring sliding groove 33 that allows the rotation and sliding of the ring 27 and a concavity 32 for stopping the rotation of the lens barrel are provided in front. The lens barrel 1 and ring 27 are positioned by a bracket 28 from upper part of the bracket 29 and fixed. A finger operation hole 34 is provided in a groove 33 for rotating and sliding the ring 27 by a finger in the bracket 29, and a CRT guide concavity 35 that positions a CRT4 is provided in the rear of the bracket 29. Thus, focusing by finger from outside is made possible.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a projection type television receiver that projects television images onto a screen.

Conventional configuration and its problems Conventional projection-type television receivers have a transmissive screen on the front of a large cabinet, and a 7-inch red screen inside the cabinet. A combination of green and blue projection tubes and projection lenses is installed, and a television image is projected onto a transparent lenticular screen using a first reflecting mirror and a second reflecting mirror fixed to the inner surface of the cabinet. As a result, the image on the projection tube is enlarged approximately seven times, and a projected image with a size of 40 to 45 inches is projected. However, such a conventional device requires a cabinet with a large space due to the position of the reflecting mirror, the angle of the projected light, and the arrangement of the projection tube and projection lens, resulting in a large device.

In addition, in direct-view color television receivers,
A cabinet of a size corresponding to the screen size of the cathode ray tube used was required, and it was difficult to make it thin and portable.

In addition, since such projection television receivers use optical components, the accuracy and positional accuracy of the distance between the CRT and the lens, as well as the distance between the lens and the screen, are important. Poor quality has a direct impact on image quality.

Hereinafter, a conventional example will be explained with reference to the drawings.

FIG. 1 shows a sectional view of a portion of a conventional lens.

A lens barrel 1 incorporating a lens has a groove 9 provided for position fixing and a male screw 10 provided for focus adjustment in a direction along the optical axis of the lens barrel 1. Further, the bracket 2 that supports the lens barrel 1 is provided with a pilot hole 8 of a screw 3 for fixing the lens barrel 1 so as to fit into a groove 9 of the lens barrel 1, and a male thread of the lens barrel 1 is A female screw 7 is provided that fits the size 1o. The bracket 2 is a base 5 that fixes the CRT 4.
It is attached with screws 11. After screwing the lens barrel 1 into the bracket 2 and setting a temporary position, the CRT 4 is mounted so that its center axis and the optical axis of the lens barrel 1 are aligned. CR
The distance between T4 and the lens barrel 1 is finely adjusted by rotating the lens barrel 1 using the male screw 10 of the lens barrel 1 and the female screw 7 of the bracket 2 to advance the screws, and the image is projected on the screen 6. The focus of the television image on the CRTA is adjusted. After focus adjustment, the screw 3 is used to press the groove 9 of the lens barrel 1 through the lower hole 8 of the bracket 2 in order to fix the position.

In this way, in the above configuration, in order to adjust the focus, the centering lens barrel of the CRT must be rotated and fixed, and the adjustment work requires many man-hours, and the adjustment work requires directly touching the lens barrel by hand. Therefore, there is a high possibility that dust etc. will adhere to the lens, leading to defects.

OBJECTS OF THE INVENTION The present invention solves these conventional drawbacks, allows the center of a CRT to be easily aligned with the optical axis of the lens barrel, and allows focus adjustment from the outside with a finger without directly touching the lens barrel. The present invention provides a projection color television receiver that can perform color projection.

Structure of the Invention In the projection television receiver according to the present invention, a bracket is provided for positioning the lens barrel and the CRTQ together to easily align the optical axis, and a concentric ring that fits the threaded portion of the lens barrel is used. This ring is rotated to adjust the position of the lens barrel.

DESCRIPTION OF EMBODIMENTS A projection television receiver according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

In this image receiver, a mirror cover 12 is attached to the rear surface of the main body 13 so as to be openable and closable by means of a support shaft.

In addition, a screen section 11 having a transmission type screen 6 is provided.
One end of the mirror lid 12 is rotatably supported on the front part of the mirror lid 12 by a support shaft, and is attached to the mirror lid 12 so as to be openable and closable. The other end of the screen part 11 is slidably fitted in the long groove provided in the base 20 of the main body 13 in the front-rear direction, and when the mirror lid 12 is opened, the screen part 1
1 is opened and the mirror lid 12 is closed, the screen space 11 can be stored overlapping therewith.

On the other hand, the projection block 16 is equipped with a main body 13 in which three small projection tubes 4 of, for example, 1.6 inch R (red), G (green), and B (blue) are combined with a projection lens barrel 1. is fixed to the bottom of the base body 20 of. Furthermore, the first mirror 14 is fixed to the substrate 20 of the main body 13 in front of the projection lens 1, and the second mirror 16 is attached to the back surface of the mirror lid 12. At this time, the projection distance to the transmission type lenticular screen 6.

The angle and the magnification of the projection lens are appropriately set to 4 to 5 times, and the screen 6 is arranged so that an image with a size of 6 to 7 inches can be projected. Further, the projection tube 4, the projection lens, and the first mirror 14 may be fixedly arranged so that fine adjustments can be made.

The projection tube 4 is a CRT of about 1.5 inches, the projection lens is a plastic three-element lens, the first mirror 14 and the second mirror 16 are plastic aluminum evaporated mirrors, and the screen 6 is a Fresnel lens. A lens-integrated lenticular screen is suitable, and weight can be reduced by doing so.

Further, when carrying the device, if the screen portion 11 is stored inside the mirror lid 12 and the mirror lid 12 is closed, the device becomes thin and compact as shown in FIG. 3, which is convenient.

When viewing an image, by lifting the mirror lid 12, the stored screen unit 11 is taken out from the front centering on the support shaft, and the image is displayed on the screen 6 as shown in Fig. 2.6. Projected large. In this way, the projection block 15 has the CRT 4 and the lens barrel 1 fixed in position, and the image on the CRT 4 is magnified by the lens of the lens barrel 1 and reflected by the first mirror 14 and the second mirror 16. Then, the image appears on the screen 6.

The screen 6 is held by the screen part 11,
Although the lower end of the screen section 11 moves back and forth on the top plate 18,
Along with this operation, the mirror lid 12 is opened and closed.

FIG. 6 shows an assembly specification diagram of this device.

A side plate 21 and a side plate 22 are attached to the left and right sides of the base body 2o, and a projection block 16 and a holder 17 for fixing and holding the first mirror 14 are attached inside the base body 2o. This base 20
Attach the top plate 18 to the top of the base, and attach it to the rotating shaft at the rear of the base.
A mirror lid 12 is rotatably attached via a shaft 19. One end of the screen part 11 is rotatably attached to the front of the mirror lid 12, and a guide roller 23 is attached to the other end of the screen part 11. It moves within the rail 24.

The upper cabinet 2 is configured as above.
6 and the lower cabinet 25.

FIG. 7 is a detailed diagram of the projection block 16.

FIG. 8 is a sectional view of the projection block 16, and FIG. 9 is an operational diagram.

The lens barrel 1 is provided with a male thread 30a and a protrusion 31 for preventing rotation. An operating ring 27 having concentric female threads 30b matching the male threads 30a is fitted into the lens barrel 1, and a groove 33 in which the operating ring 27 can rotate and slide and a recess 32 matching the rotation stop protrusion 31 are provided in the front. Insert the lens barrel 1 and the operating ring 27 into the bracket 29,
From the top of the bracket 29, insert the groove 3 in the same way as the bracket 29.
The lens barrel 1 and the operating ring 27 are positioned and fixed by a bracket 28 provided with a recess 32 and a recess 32. Also, bracket 29
A notch 34 is provided in the groove 33 so that the ring 27 can be easily rotated and slid with a finger. Further, a recess 35 is provided at the rear of the bracket 29 so that the position of the CRT 4 can be adjusted. The CRT 4 is fixed from the rear with a bracket 36.

By finely adjusting the distance between lens barrel 1 and 01740,
To adjust the focus of the image on the screen 6, in this case, by rotating and sliding the operating ring 27 with your finger as shown in FIG.
2 allows it to move back and forth without rotating, making focus adjustment possible.゛According to this embodiment, since the focus is adjusted without directly touching the lens barrel 1, the possibility of dirt getting on the lens inside the lens barrel 1 is reduced, and the ring 27 can be attached to the lens barrel 1 in advance. By doing this, pre-adjustment is possible and workability is improved. In addition, since the CI'lT4 and the lens barrel 1 are positioned using the integrated bracket 29, the CI'lT4 and the lens barrel 1 can be placed within a certain level of accuracy, eliminating the need for adjustment. .

In addition, in the above explanation, the focus adjustment block is
Although we have explained one lens barrel and one lens barrel, Figures 10 and 11
As shown in the figure, a color image can be displayed on the screen by swinging three CRT lens barrels at a predetermined angle and fixing them with brackets.

Effects of the Invention As described above, according to the present invention, focus can be adjusted by rotating a ring with a screw thread that matches the male thread made on the lens barrel, and the lens barrel is compact and cannot be turned directly with fingers. The present invention can be applied to any type of set, and since the space between the lens barrel and the screen can be sealed, there is a low possibility that dust will enter between the lens barrel and the screen, and an excellent effect can be obtained in that defects can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a lens portion used in a conventional projection television receiver, and FIGS. 2 and 3 are perspective views showing the basic structure of a projection television receiver in an embodiment of the present invention. , FIG. 4 is a cross-sectional plan view, FIG. 5 is a cross-sectional side view, FIG. 6 is an assembled view, and FIG. 7 is an assembled view of essential parts of a projection television receiver according to an embodiment of the present invention. Figure 8 is a sectional side view of the same, Figure 9 is a lateral pressure side view for explaining the operation,
FIGS. 10 and 11 are assembly diagrams of the main parts thereof. 1... Lens barrel, 4... CRT, e...
... Screen, 11 ... Screen holding part, 12 ... Mirror lid, 13 ... Main body,
14...First mirror, 15...Projection block, 16...Soba...Second mirror, 17...
・First mirror holder, 18...Top plate, 19...
...Shaft, 20...Base, 21...
...Side plate (right), 22...Side plate (left), 23
...Guide roller, 24...Guide groove, 26...Lower cabinet, 26...
Upper cabinet, 27... Operation ring, 28.
...Bracket, 29...Bracket,
30...Focus adjustment screw, 31...
... Lens barrel rotation stop convex part, 32 ... Lens barrel rotation stop concave part, 33 ... Operation ring sliding groove, 34°・°
...°Finger operation hole, 35...CRT guide recess,
36...CRT holder. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Figure 4 Figure 13 Figure 6 Figure 7 Figure 2 Figure] Figure

Claims (1)

[Claims] A male screw is provided on the side surface of the lens barrel that supports the projection lens so as to extend in the optical axis direction of the lens, and a convex portion is provided on the side surface in front of the male screw, and a female screw that matches the male screw is provided. Screwing a concentric ring into the male thread of the lens barrel,
The first part has a recess for positioning and inserting the cathode ray tube from the rear.
A recess shaped along the lower half of the optical axis of the lens barrel and ring is provided in front of the bracket, and the recess has a hole large enough to fit a finger into the part corresponding to the ring, and A second bracket having a shape along the upper half of the optical axis of the lens barrel and ring is provided on the first bracket to prevent the lens barrel from rotating in the rotational direction of the lens barrel. The distance between the lens barrel and the cathode ray tube is finely adjusted by holding the ring in between and rotating and sliding the ring with your fingers to move the lens barrel without rotating in the optical axis direction. 1. A projection television receiver comprising a projection block for adjusting the focus of an optical system.