JPS6238385Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a projection type television receiver of a type in which light is projected from the back side of a screen, and is intended to provide an apparatus that is easy to adjust and repair.

In a projection type television receiver that projects light from the front of the screen, the circuit for image reception is located in front of the screen, so it is possible to adjust or repair the circuit while viewing the image on the screen. However, with projection television receivers that project light from the back of the screen,
The circuit for image reception is located below the back of the screen, and the back of the screen, including the reflecting mirror, is sealed, making it difficult to adjust or repair the circuit while looking at the screen.

The present invention is intended to provide a projection type television receiver in which light is projected from the back side of the screen, in which circuit adjustments can be made while viewing the screen.

An embodiment of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, a screen 2 is attached to the upper half of the front surface of the cabinet 1. Projection tubes 3a, 3b, and 3c for red, blue, and green are installed below the cabinet 1.
Reflecting mirrors 4 and 5 are attached to the inner wall of the front plate and the inner wall of the back plate of the cabinet 1, respectively, so that the light emitted from the projection tubes 3a, 3b, and 3c is projected onto the screen 2. A shielding plate 6 is provided inside the cabinet 1 to prevent dust from adhering to this optical system. The front plate, back plate, top plate, screen 2, and shielding plate 6 of the cabinet 1 form a sealed space in the upper interior of the cabinet 1 in which the inner surface of the screen 2 and the reflecting mirrors 4 and 5 are accommodated. In order to attach the shielding plate 6, guide plates 7a, 7b, 8a, 8b are installed on both sides of the cabinet 1.
(8a is not shown) is provided, and the guide plate 7
A and 7b and 8a and 8b are used as guide grooves, into which the shielding plate 6 is inserted. The shielding plate 6 is made of a material mainly made of paper such as hardboard, and is curved in the middle as shown in the figure. Since the shield plate 6 has some elasticity, it can be easily inserted into the guide groove. The shielding plate 6 has a U-shaped notch from below, into which the lens system 9 provided on the front surface of the projection tubes 3a to 3c is fitted. Note that a plate is provided in advance at the lower end of this lens system and the front plate of the cabinet 1, so that the degree of sealing of the above-mentioned sealed space is not deteriorated. The upper end of the shielding plate 6 is fixed to a crossbar 10 provided at the rear end of the cabinet 1 with a plurality of screws 20a, 20b, 20c, and 20d.

A fixture 13 to which a printed circuit board 12 is attached to a mounting body 11 to which projection tubes 3a to 3c are attached is rotatable around shafts 14a and 14b. Specifically, as shown in FIG. 3, recesses 11b and 11c are provided at both ends of the arm 11a, which is a part of the mounting body 11 and has a U-shaped cross section.
3a enters the recesses 11b and 11c, and the arm 13a abuts the upper end of the arm 11a, so that the printed circuit board 12 is tilted as shown in FIG. The printed circuit board can be fixed by inserting the screws 15a and 15b into the through holes of the protrusions 13b and 13c of the fixture 13 and screwing them into the screw holes of the protrusions provided in the mounting body 11. An image receiving circuit is preassembled on the printed circuit board. This circuit portion, the portion housing the projection tubes 3a to 3c, etc., is covered by attaching a back plate 16 to the cabinet 1.

Both ends of the bottom plate 14 of the cabinet 1 are lifted upward, and a recess is formed between the bottom plate 14 and the side plates 18a, 18b, and wheels 19a, 19b, 19 are provided to move the cabinet 1 into the recess.
c, 19d (19d is not shown) are attached.

When adjusting or repairing the device, the back plate 16 is removed, the screws 20a to 20c are removed, and the shield plate 6 is pulled out. Next, the front of the screen 2 is shielded with a board or cloth, the power is turned on, and the circuit is adjusted and repaired. When the printed circuit board 12 is opened as shown in FIG. 3, the back surface of the printed circuit board 12 can also be inspected. At this time, it is convenient because the screen 2 can be viewed from the back side and adjustments can be made while checking the state of the screen.

When moving the device, use vehicles 19a to 19d.
It is easy because it is provided. Car 19a-1
9d protrudes only a little from the lower surface of the bottom plate 17, so there is no need to increase the height of the device, and the screen 2 can be set at a predetermined position.

As described above, according to the present invention, by removing the shielding plate from the rear of the cabinet, it is possible to adjust and repair the circuit while viewing the state of the screen on the screen.

[Brief explanation of the drawing]

FIG. 1 is a sectional side view of a projection type television receiver according to an embodiment of the present invention, FIG. 2 is a back view of the same, and FIG. 3 is a sectional side view of a portion of the apparatus. 1... Cabinet, 2... Screen, 3a
~3c... Projection tube, 4, 5... Reflector, 6... Shielding plate, 7a, 7b, 8a, 8b... Guide plate, 1
0...Yokogi, 20a-20d...Screw, 12...
Printed circuit board, 13...Mounting body, 11a...棧,
14a, 14b...Axes.

Claims (1)

[Scope of claim for utility model registration] (1) A screen is installed above the front of the cabinet, a projection tube is housed below the cabinet,
A plurality of reflecting mirrors that reflect the output light of the projection tube so as to project it onto the inner surface of the screen are housed inside the cabinet, and a printed circuit board with an image-receiving circuit installed near the projection tube. A shielding plate is provided inside the cabinet, located in front of the projection tube, for forming a sealed space in the upper interior of the cabinet to accommodate the inner surface of the screen and the reflecting mirror, and the shielding plate The projection type television receiver is detachably attached to the cabinet so that it can be taken out from the rear side of the cabinet. (2) A projection television receiver according to claim 1, wherein the printed circuit board is rotatably attached to a mounting body so that it can be rotated to the rear of the cabinet and pulled out.