JPH11242293A - Back projection type color projector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back projection type color projector capable of almost surely adjusting registration without damaging an article quality. SOLUTION: In this back projection type color projector 1A, a frame 2 and a screen holder 50 are closely disposed in a state of almost matching the inner peripheral edge 2a of the frame 2 for constituting a part of a cabinet 3 and the inner peripheral edge 50a of the screen holder 50 and a sensor S is attached at the center part of the respective sides of the screen holder to in the state so as not to be projected from the inner peripheral edge 50a of the respective sides. By such an attaching structure, on a screen viewed from a viewer side, the shadow of the screen holder 50 is viewed as a parallel shadow along the inner peripheral edge 2a of the respective sides of the frame 2 and is viewed as if a part of the frame 2 and no feeling of incongruity is present.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear projection type color projector, and more particularly to a structure for arranging registration detection sensors in a cabinet for forming light beams of three primary colors on a screen holder.

[0002]

2. Description of the Related Art First, a conventional rear projection type color projector (hereinafter simply referred to as "rear projector") will be described with reference to the drawings. FIG. 14 is a perspective view schematically showing a general rear projector, FIG. 15 is an enlarged front view of a screen portion of the rear projector shown in FIG. 14, and FIG. 16 is a sectional view taken on line AA of FIG. It is a part enlarged sectional view.

In FIGS. 14 and 15, reference numeral 1 generally indicates a conventional rear projector. The rear projector 1 includes a screen 4, a reflecting mirror 6, and three light beam generators for generating light beams of three primary colors, such as a cathode ray tube, in a cabinet 3 having a frame 2 formed on the front. Is incorporated.

[0004] Inside the frame 2 of the cabinet 3, for example, a horizontally long rectangular screen 4 having an aspect ratio of 4: 3 is provided. The screen 4 is mounted so as to be exposed on the frame 2 while being attached to a quadrangular screen holder 5 having a size corresponding to the frame 2. Screen holder 5 is 4
The side is fixed to the cabinet 3 with screws or the like. The screen 4 has, for example, a three-layer structure in which a Fresnel lens 4A, a lenticular lens 4B, and a transparent plate 4C are attached from the inside. Behind screen 4
A reflecting mirror 6 is disposed obliquely with respect to the screen 4, and a lower portion of the chassis 7 between the reflecting mirror 6 and the screen 4 is provided with the three cathode ray tubes 8.
R, 8G, and 8B are arranged and fixed in a straight line. Further, an electronic circuit board and the like are also fixed to the chassis 7, but since this portion is not a main part of the present invention, a description thereof will be omitted.

In general, in the rear projector 1 of this type, three light beams of red, green and blue generated from the respective cathode ray tubes 8R, 8G and 8B are reflected by the reflecting mirror 6 and reflected on the screen 4 by the reflecting mirror 6. From the back, each light beam is adjusted so that an image can be formed on the screen 4. That is, so-called registration adjustment. As one of conventional adjustments of the registration, a method of calculating a registration in a screen display area on the screen 4 from a registration situation outside the area by calculation or the like is adopted. This calculation method has a problem in registration accuracy. For this reason, a registration detection sensor (hereinafter simply abbreviated as “sensor”) S is provided near the center of each side inside the frame 2 near the screen display area on the screen 4.
It is preferable to adjust the registration by disposing

For this reason, as shown in FIGS. 15 and 16, this sensor S is moved in a state where the position of the screen side inner peripheral edge 5a of the screen holder 5 is retracted from the position of the inner peripheral edge 2a of the frame 2. The screen holder 5 is formed in a size that can be arranged, and the screen holder 5 having such a size is mounted on the cabinet 3.
And the screen holder 5 of this arrangement
The sensor S is located on the back side of the center of each side of
Attach. The arrangement relationship in this case is such that the position of the screen side edge Sa of the sensor S is located on the screen side of the inner peripheral edge 5a of the screen holder 5, but is slightly retracted from the position of the inner peripheral edge 2a of the frame 2. become.

With such an arrangement and mounting structure,
The sensor S can be positioned closest to the screen immediately behind the screen of the screen 4, but when the viewer looks at the screen, as shown in FIG. It is slightly enlarged on the partial screen and appears in a rectangular shape (hereinafter, this is referred to as a shadow Sd of the sensor S). Although these shadows Sd are small, they are quite conspicuous and impair the merchantability.

[0008]

Therefore, in the conventional rear projector 1, in order to avoid the problem of the shadow Sd of the sensor S, the sensor S cannot be arranged at an original ideal position, and the size of the sensor S increases from the screen display area. The sensor S is arranged at a position distant from the screen or at a position far away from the screen, and correction is performed on software. However, it is difficult to secure sufficient performance as a commercial product by these methods from the viewpoint of technology and from the viewpoint of cost.

An object of the present invention is to solve such a problem, and it is an object of the present invention to provide a rear projector which can perform registration adjustment almost certainly and does not impair the commerciality.

[0010]

SUMMARY OF THE INVENTION Accordingly, a first aspect of the present invention is to provide a cabinet having a quadrangular frame formed on the front, and a size corresponding to the frame inside the frame of the cabinet. A screen mounted to be exposed to the frame while being attached to a quadrilateral screen holder, a reflecting mirror disposed obliquely with respect to the screen, and a mirror between the reflecting mirror and the screen. A light beam generator for generating light beams of three primary colors of light disposed at a lower position, and a sensor (for registration detection) disposed behind a central portion of each side of the screen. A sensor configured to reflect a light beam generated from a light beam generator by the reflecting mirror and form an image on the screen from the back of the screen; In a rear projector configured to be adjustable using the frame, the frame and the screen holder are arranged close to each other with the inner peripheral edge of the frame and the inner peripheral edge of the screen holder substantially aligned, and the screen in that state is arranged. The above problem is solved by adopting a structure in which the sensor is attached to the center of each side of the holder so as not to protrude from the inner peripheral edge of each side.

According to a second aspect of the present invention, in the rear projector having the above-described configuration, the screen holder includes a sensor holder for mounting a sensor and a wire holder for locking a wire of the sensor. It is characterized by being integrally molded.

Therefore, according to the rear projector of the first embodiment of the present invention, the shadow of the sensor is hidden by the shadow of the screen holder, and the shadow of the screen holder is a parallel shadow along each side of the frame. It looks as if it were part of a frame and does not give the viewer a sense of discomfort. Further, according to the rear projector of the second embodiment of the present invention, since the screen holder, the sensor holder, and the wire holder are integrally formed by molding, the number of parts and the number of assembling steps can be reduced. The locking process of the book wire can also be arranged and stored in the screen holder.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an image display device according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a front view around a screen of a rear projector according to an embodiment of the present invention,
2 is an enlarged cross-sectional view of the rear projector shown in FIG. 1 taken along line AA, FIG. 3 is a partial perspective view showing a structure of a screen holder used in the rear projector shown in FIG. 1, and FIG. 3 is an enlarged perspective view of the sensor holder according to the first embodiment of the sensor holder portion shown by arrow X in FIG. 3, FIG. 5 is a cross-sectional view taken along line AA in FIG. 4, and FIG. 6 is a cross-section taken along line BB in FIG. FIGS. 7A and 7B are views for explaining a mounting method of mounting the sensor on the sensor holder of the first embodiment shown in FIGS. 5 and 6, and FIG. 7A is a view before mounting the sensor on the sensor holder. FIG. 8B is a partial cross-sectional view of the sensor holder and the sensor showing a state, FIG. 8B is a partial cross-sectional view of the sensor holder and the sensor showing a state where the sensor is mounted on the sensor holder, and FIG. T 9 is an enlarged perspective view of a sensor holder according to a second embodiment of the second embodiment, FIG. 9 is a cross-sectional view taken along line AA of FIG. 8, FIG. 10 is a cross-sectional view taken along line BB of FIG. 8, FIG. FIG. 11 is a view for explaining a mounting method of mounting a sensor on the sensor holder of the second embodiment shown in FIG. 10, wherein FIG. 10A shows a state before mounting the sensor on the sensor holder; B is a partial cross-sectional view of the sensor holder and the sensor showing a state where the sensor is mounted on the sensor holder, FIG. 12 is a cross-sectional view of the wire holder taken along line AA in FIG. 3, and FIG. FIG. 13 is a cross-sectional view of the wire holder in FIG. 3 taken along line BB. The same parts as those of the rear projector 1 of the related art will be described with the same reference numerals.

First, a rear projector according to an embodiment of the present invention will be described with reference to FIGS. Reference numeral 1A indicates a rear projector according to the embodiment of the present invention.
Similarly to the general rear projector 1 shown in FIG. 14, this rear projector 1A also includes a screen 4, a reflecting mirror 6, and light beams of three primary colors of light in a cabinet 3 having a frame 2 formed on the front. A cathode ray tube, which is three light beam generators that generate light, is incorporated therein. The detailed description of the configuration is the same, and will not be repeated.

A rear projector 1A according to an embodiment of the present invention.
In the above, there are features in the mounting structure of the sensor S and its components, and these points will be described with reference to the drawings in FIG. 2, an inner peripheral edge 2a of the frame 2 and an inner peripheral edge 5 of the screen holder 50 are shown.
In this state, the frame 2 and the screen holder 50 are arranged close to each other in such a state that the inner edges 50a are substantially aligned with each other.
The sensor S is attached so as not to protrude further. Such a mounting structure is the first point of the present invention.

By mounting the sensor S in this manner, as shown in FIG. 1, on the screen viewed from the viewer side, the shadow 50d of the screen holder 50 is formed along the inner peripheral edge 2a of each side of the frame 2. The shadow Sd of the sensor S is the shadow 5 of the screen holder 50.
0d, a rectangular shadow Sd as shown in FIG.
Never appear as Since the shadows 50d of these screen holders 50 are parallel shadows along each side of the frame 2, it looks as if they are a part of the frame 2, and for example, when the screen size is 41 inches or more, If so, the width of these shadows 50d is about 1 to 2 mm, so that the viewer does not feel almost uncomfortable.

Next, the structure of a screen holder 50 suitable for use in the rear projector 1A of the present invention will be described with reference to FIGS. The conventional screen holder 5 is usually made of sheet metal and made of a rectangular metal material having a substantially Z-shaped cross section, and the back surface of the plate on which the screen 4 of such a screen holder 5 is attached,
A structure is adopted in which a sensor holder (not shown) holding the sensor S is screwed. The wires connected to the sensor S are fixed to the cabinet 3 and the like around the screen holder 5 using a separate binding part (not shown) and processed.

In the rear projector 1A of the present invention, such a structure for holding the sensor S and a method for processing wires may be employed. In addition to the screen holder, a plurality of sensor holders, wire binding parts, screws, etc. A large number of parts are required, and the cost of parts and assembly increases.

For this reason, the inventor of the present invention has invented a screen holder 50 suitable for application to the rear projector 1A of the present invention as shown in FIGS. The screen holder 50 is made of a resin, and has a structure, for example, as shown in FIG.
Reference numerals 2 and 53 are bent in a substantially Z-shape in cross section, and are configured to press each side of the rectangular screen. FIG.
In the figure, an object that holds one side of the rectangle was taken out, and the back side was shown facing upward. Among the plates forming a Z-shape,
The plate 51 is a plate that presses and supports the screen 4,
Numeral 2 is a connecting plate which stands substantially perpendicular to the plate 51, and plate 53 is a mounting plate bent at a right angle to the plate 52 and parallel to the plate 51.

A sensor holder 54 and a wire through hole 55 are provided on the back surface of each plate 51 for supporting and supporting the screen 4, and a pressing spring 5414 (FIG. 4) is provided at a position corresponding to the position of the sensor holder 54 on the plate 52. Alternatively, a pressing spring 5425 (FIG. 8) is provided, and a plurality of pairs of wire holders 56A, 56A are provided on the plate 53 at lateral positions shifted from the positions of the sensor holder 54 and the wire passage hole 55.
B and a plurality of mounting screw holes 57 are integrally molded with resin at a predetermined interval.

FIGS. 4 to 7 show the structure of the first embodiment of the sensor holder 54, and FIGS. 8 to 11 show the structure of the second embodiment. First, regarding the sensor holder 54A of the first embodiment, the sensor holder 54A has a storage chamber 5410 and a pressing spring 5414 formed on the plate 51 of the screen holder 50, and the storage chamber 5410 has a thickness of the sensor S. It is almost twice as deep and its bottom 541
1 is provided with an insertion hole 5412 large enough to insert the sensor S, and a support shelf 5413 for supporting the sensor S is formed in a portion where the insertion hole 5412 is not opened.
As shown in FIGS. 4 and 6, a narrow flange 5418 projecting from the upper end of the wall rising from the plate 51 to the inside of the storage room 5410 in parallel to the plate 51 above the both sides of the storage room 5410. Are formed. These collars 5418
The space between them becomes an entrance aperture 5419 for the light beam. One pressing spring 5414 is connected to the plate 52 of the sensor holder 54.
In addition, as if a base end 5415 of a part of the plate 52
2 and the other leg 5416 is formed in a structure cut out from the plate 52, and a locking claw 5417 is formed at its free end. Therefore, the leg portion 5416 protrudes toward the storage chamber 5410 from the substantially vertical plate 52, and the locking claw 5417 at the distal end protrudes toward the insertion hole 5412 in a state where the depth of the insertion hole 5412 is narrowed.

The sensor holder 54 having the structure described above.
7A, the leg 5416 of the pressing spring 5414 is pushed down in the counterclockwise direction of the arrow Ra about the base end 5415, and the insertion hole 5412 is almost fully opened as shown in FIG. 7A. In this state, the sensor S is moved from the screen 51 mounting side of the plate 51 to the plate 51 in FIG.
Is inserted obliquely from below into the storage chamber 5410 through the insertion hole 5412 of the bottom 5411 thereof and the support shelf 541 of the bottom 5411 is inserted.
3 and between the flanges 5418 on both sides, and push the other side of the sensor S in the direction indicated by the arrow Rb. When the pressing down of the pressing spring 5414 is released, the leg 541 is released.
6 attempts to return to the original position by its own spring force, and presses the pressing spring 5414 side of the sensor S with the spring force at this time. Therefore, as shown in FIG. 7B, the sensor S is held in a state in which the upper part thereof is suppressed by the flanges 5418 on both sides of the storage chamber 5410 and the lower part is placed on the distal end surfaces of the support shelf 5413 and the locking claw 5417. Side wall of storage chamber 5410 and pressing spring 5
414 with the leg portion 5416 and fixed, and the attachment to the sensor holder 54A is completed. Thus, the sensor S can detect the state of registration of the light beam incident on the entrance aperture 5419.

The sensor holder 54 of the first embodiment
Since A has a structure in which the sensor S is mounted from the bottom 5411 of the storage chamber 5410, the workability is slightly poor. What improves the workability is the sensor holder 54B of the second embodiment shown in FIGS. The sensor holder 54B also has a storage chamber 5420 and a pressing spring 5425 formed on the plate 51 of the screen holder 50.
Storage chamber 542 in which light beam entrance opening 5429 is opened
Reference numeral 0 denotes an area and a depth in which the sensor S can be mounted, and a bottom 5421 is formed except a part of the plate 51 on both sides of the storage chamber 5420. Side walls 5423 rising from the plate 51 are formed on three sides around the bottom 5421 excluding the pressing spring 5425 side.
423 project from the upper end of the storage chamber 5420 to the inside of the
A short flange 5424 is formed horizontally with respect to 1. The inner surfaces of the three side walls 5423 are finished with inclined surfaces that are narrowed toward the flange 5424. One pressing spring 5
Reference numeral 425 is formed on the plate 52 of the sensor holder 54, as if a part of the plate 52 was connected to the base 52 by the base end 5426 and the other leg 5427 was cut and raised from the plate 52. The end face 5428 of the tip is located at the same height position as the inner face of the flange 5424.

The sensor holder 54 having the structure described above.
In order to mount the sensor S on B, as shown in FIG. 11A, the leg 5427 of the pressing spring 5425 is rotated in the counterclockwise direction of the arrow Ra around the base end 5426 of the pressing spring 5425.
Is pressed down, the storage chamber 5420 is opened, the sensor S is inserted from the entrance opening 5429 in this state, and one side edge thereof is inserted under the flange 5424 on the opposite side of the pressing spring 5425,
Then, another side edge of the sensor S on the pressing spring 5425 side is pushed in the direction of the arrow Rb, and is placed on the bottom 5421.
The pressing spring 5425 is released. The pressing spring 5425 returns to its original position, and presses a part of the upper surface of the sensor S with its end surface 5428. Therefore, as shown in FIG.
Is clamped and fixed between the bottom 5421 of the storage chamber 5410, the flange 5424, and the end face 5428 of the pressing spring 5425, and the fixing and mounting to the sensor holder 54B are completed. Thus, the sensor S can detect the state of registration of the light beam incident on the entrance aperture 5429.

Next, the structure of the wire holders 56A and 56B will be described with reference to FIG. 3, FIG. 12 and FIG. The wire holders 56A and 56B are integrally formed on the plate 53 at predetermined intervals in parallel with each other and in opposite directions. Each of the wire pressing springs 5610 and 5620 is slightly narrower than the thickness of the wire W, and the wire pressing springs 5610 and 5620 are connected to the plate 5 as if a part of the plate 53 was cut and raised.
3 is formed parallel to the surface. Return 561 is provided at the tip of each wire pressing spring 5610, 5620.
1, 5621 are formed to have a function of preventing the wire W from coming off.

Therefore, as shown in FIG.
The wire W connected to the wire W can be returned to the pair of wire pressing springs 5610 and 5620 provided at appropriate locations and alternately inserted from the 5611 and 5621 sides to lock the wire W. The tip of the sensor S attached to the sensor holder 54 passes through a wire hole 55 formed in the plate 51.
Can be connected to The screen holder 50 is opened at a plurality of locations and is fixed to the cabinet 3 with screws B via screw holes 57.

[0027]

As is apparent from the above description, according to the rear projection type color projector of the embodiment of the present invention,
The shadow of the sensor is hidden by the shadow of the screen holder, and the shadow of the screen holder is a parallel shadow along each side of the frame, so that it looks as if it is a part of the frame, giving a sense of discomfort to the viewer Since there is no such thing, there is no loss of merchantability. According to the screen holder of the present invention, the sensor holder and the wire holder are integrally formed on the screen holder by molding, so that the number of parts and the number of assembling steps can be reduced. The book wire locking process can also be stored neatly in the screen holder.

[Brief description of the drawings]

FIG. 1 is a front view of a peripheral portion of a screen of a rear projection type color projector according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the rear projection type color projector shown in FIG.

FIG. 3 is a partial perspective view showing a structure of a screen holder used in the rear projection type color projector shown in FIG.

FIG. 4 is an enlarged perspective view of the sensor holder according to the first embodiment of the sensor holder portion indicated by arrow X in FIG. 3;

FIG. 5 is a sectional view taken on line AA of FIG. 4;

FIG. 6 is a sectional view taken on line BB of FIG. 4;

FIG. 7 is a view for explaining a mounting method of mounting the sensor on the sensor holder of the first embodiment shown in FIGS. 5 and 6, wherein FIG. 7A shows a state before mounting the sensor on the sensor holder. And FIG. B is a partial cross-sectional view of the sensor holder and the sensor showing a state where the sensor is mounted on the sensor holder.

FIG. 8 is an enlarged perspective view of the sensor holder according to the second embodiment of the sensor holder portion indicated by arrow X in FIG. 3;

FIG. 9 is a sectional view taken on line AA of FIG. 8;

FIG. 10 is a sectional view taken on line BB of FIG. 8;

FIG. 11 is a view for explaining a mounting method of mounting a sensor on the sensor holder of the second embodiment shown in FIGS. 9 and 10, wherein FIG. 11A shows a state before mounting the sensor on the sensor holder. And FIG. B is a partial cross-sectional view of the sensor holder and the sensor showing a state where the sensor is mounted on the sensor holder.

12 is a cross-sectional view of the wire holder shown in FIG. 3 taken along line AA.

FIG. 13 is a cross-sectional view of the wire holder shown in FIG. 3 taken along line BB.

FIG. 14 is a perspective view schematically illustrating a conventional rear projection type color projector in a substantially linear manner.

15 is an enlarged front view of a screen portion of the rear projection type color projector shown in FIG.

FIG. 16 is a partially enlarged cross-sectional view taken along line AA of FIG.

[Explanation of symbols]

1A: rear projection type color rear projector according to the embodiment of the present invention, 2 ... frame, 3 ... cabinet, 4 ... screen, 50 ... screen holder, 50d ... shadow of screen holder 50, 51, 52, 53 ... plate, 54A ... The sensor holder of the first embodiment, 54B ... the sensor holder of the second embodiment, 5410, 5420 ... the storage room, 5
414, 5425: press spring, 55: wire through hole,
56A, 56B: Wire holder, 5610, 562
0 ... wire holding spring, 5611, 5621 ... return,
57: screw hole, S: (for registration detection) sensor, Sd: shadow of sensor S

Continued on the front page (51) Int.Cl. ⁶ Identification code FI H04N 9/31 H04N 9/31 C

Claims (4)

[Claims] 1. A cabinet in which a quadrilateral frame is formed on the front, and a frame attached to a quadrilateral screen holder having a size corresponding to the frame inside the cabinet of the cabinet. A screen mounted so as to be exposed, a reflecting mirror disposed obliquely to the screen, and a light beam of three primary colors of light disposed at a lower position between the reflecting mirror and the screen. A light beam generator that generates the light, and a registration detection sensor disposed behind the center of each side of the screen are built in, and the light beam generated from the light beam generator is reflected by the reflecting mirror. From the back of the screen, it is configured to be adjustable using the registration detection sensor to form an image on the screen In the rear projection type color projector, the frame and the screen holder are disposed close to each other with an inner peripheral edge of the frame and an inner peripheral edge of the screen holder substantially aligned, and the screen holder in that state is provided. A rear projection type color projector, wherein the registration detecting sensor is attached to a central portion of each side of the above so as not to protrude from an inner peripheral edge of each side. 2. A cabinet in which a quadrilateral frame is formed on the front surface, and the cabinet is attached to a quadrangular screen holder having a size corresponding to the frame inside the cabinet. A screen mounted so as to be exposed, a reflecting mirror disposed obliquely to the screen, and a light beam of three primary colors of light disposed at a lower position between the reflecting mirror and the screen. A light beam generator that generates the light, and a registration detection sensor disposed behind the center of each side of the screen are built in, and the light beam generated from the light beam generator is reflected by the reflecting mirror. From the back of the screen, it is configured to be adjustable using the registration detection sensor to form an image on the screen In the rear projection type color projector, the screen holder is formed integrally with a sensor holder for mounting a registration detection sensor and a wire holder for locking a wire of the registration detection sensor. Features a rear projection type color projector. 3. The sensor holder formed in the screen holder includes a storage chamber for storing a registration detection sensor and a pressing spring pressing one side of the registration detection sensor stored in the storage chamber. The rear projection type color projector according to claim 2, wherein the rear projection type color projector is configured. 4. The wire holders formed on the screen holder are parallel to each other at predetermined intervals in opposite directions and parallel to each other with a space slightly smaller than the thickness of the wire with respect to the plate surface. 3. The rear projection type color projector according to claim 2, comprising a pair of wire holding springs having a structure in which a return is formed in a portion.