JP2004151281A - Picture display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide attaching structure by which the curvature of a protector and a screen is prevented by absorbing the expansion and the contraction of the protector and the screen even when the protector and the screen are expanded and contracted due to temperature or humidity change in the case of attaching the protector and the screen on a front frame. <P>SOLUTION: In the picture display device where the screen and the protector are attached so as to cover the aperture part of the front frame, a boss longer in dimension than the thickness of the protector is provided on the front surface side of the front frame, a hole larger than the outside diameter of the boss is formed on the protector and a screw having a flange part larger than the inside diameter of the hole is used to fix the protector. One end of a bracket is attached to the back surface side of the front frame, and the end of the screen is held between the other end of the bracket and the front frame. Thus, the protector and the screen are attached in a 1st direction parallel with a picture display surface and a 2nd direction orthogonal to the 1st direction while holding the clearance of specified amount. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an image display device such as a projection type television receiver for projecting image light from the back of a screen, and to a mounting structure for mounting a protector on the front of the screen.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, a rear projection television receiver is known as an example of an image display device. The rear projection type television receiver is provided with an optical device for projecting an image in a housing, an opening in a front frame of the housing, and a screen mounted inside the opening. The screen is generally configured by combining a lenticular lens and a Fresnel lens, displays the image light projected from the optical device on the back of the screen, and allows the user to view the displayed image from the front side of the screen. I have.
[0003]
Further, in order to protect the screen, and to improve the contrast and protect the eyes of the viewer, a transparent or semi-transparent plastic plate or the like is formed on the front side of the front frame so as to cover the opening of the housing. A transparent protective filter (hereinafter, referred to as a protector) is attached. Generally, the protector is mounted on the front frame surface using screws or an adhesive, and the screen is generally mounted on the rear side of the front frame using mounting brackets or the like.
[0004]
However, when the protector is attached to the front frame using a screw or an adhesive, the protector expands or contracts due to a change in temperature or humidity, so that the protector is curved and distorted, and the display image looks unnatural. There was an inconvenience. In order to cope with this inconvenience, a material having a small expansion and contraction may be used. However, since it is expensive and the deformation amount is not zero, there is no guarantee that no bending occurs.
[0005]
Further, not only the protector but also the screen expands or contracts due to a change in temperature or humidity. Therefore, it is necessary to prevent the screen from being bent when the screen is mounted. In particular, since the expansion coefficient of the lenticular lens differs from that of the Fresnel lens in the screen, the lenticular lens having a large expansion coefficient undulates with a change in temperature, and a gap is formed between the screen and the Fresnel lens, causing color unevenness.
[0006]
In order to solve such a defect, for example, Japanese Patent Application Laid-Open No. Hei 9-18816 discloses a frame in which a lenticular lens and a Fresnel lens are mounted, and a mounting member for mounting the lenticular lens and the Fresnel lens to the frame. The upper part of the lenticular lens and the frame are integrally fixed, the lower part of the lenticular lens and the lower part of the Fresnel lens are integrally fixed, and the lenticular lens and the lower part of the Fresnel lens are not brought into contact with the frame. An example is described in which such a configuration absorbs expansion and contraction caused by a temperature change of the screen.
[0007]
However, in this example, measures against expansion and contraction of the screen are taken, but measures against expansion and contraction of the protector are not described.
[0008]
Japanese Patent Application Laid-Open No. 9-69994 discloses a method of attaching a screen and a protector to a front portion of a housing. In this example, the mounting method is preferable in terms of design appearance. However, the above-described measures regarding the expansion and contraction of the screen and the protector are not taken into consideration, and the change in temperature and the like are not considered.
[0009]
[Patent Document 1]
Japanese Patent Application Laid-Open No. Hei 9-18816 (page 3, FIG. 1)
[Patent Document 2]
JP-A-9-69994 (page 3, FIG. 1 and FIG. 2)
[0010]
[Problems to be solved by the invention]
In the conventional image display device, when the protector is attached to the front frame using a screw or an adhesive, there is a disadvantage that the protector expands or contracts and curves due to a change in temperature or humidity. Also, the lenticular lens and the Fresnel lens constituting the screen expand and contract with the temperature change, so that a measure against the temperature change was required.
[0011]
The present invention has been made in view of the above circumstances, and has as its object to provide an image display device capable of absorbing expansion and contraction of a protector and a screen.
[0012]
[Means for Solving the Problems]
The invention according to claim 1 is a cabinet main body having a front frame having an opening formed in a front portion, a screen attached to a rear side of the front frame so as to close the opening of the front frame, An image display device comprising: a protector attached to a front surface of the front frame so as to cover an opening, so as to display an image on a rear surface of the screen.
An outer peripheral portion of the protector is attached to the front frame with a predetermined amount of clearance in a first direction parallel to a display surface of the image and a second direction orthogonal to the display surface. First attachment means and second attachment means for attaching the outer peripheral portion of the screen to the front frame with a predetermined amount of clearance in the first direction and the second direction. And characterized in that:
[0013]
According to a fifth aspect of the present invention, there is provided a cabinet body having a front frame having an opening formed in a front portion, a screen attached to a front side of the front frame so as to cover the opening of the front frame, and And a protector attached to the front frame so as to cover the surface of the screen having a large size, and an image display device configured to display an image on the back of the screen,
The outer periphery of the protector and the screen has a predetermined amount of clearance with respect to the front frame in a first direction parallel to a display surface of the image and a second direction orthogonal to the display surface. It is characterized by having third attaching means for attaching.
[0014]
According to the image display device of the present invention described above, even if the protector and the screen expand and contract due to a temperature change or the like, the protector and the screen can absorb the expansion and contraction, and can prevent the protector and the screen from being curved.
[0015]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view and a side view showing an appearance of an image display device according to an embodiment of the present invention.
[0016]
FIG. 1A shows an example of a rear projection television receiver as an image display device, and reference numeral 10 denotes a cabinet main body of the receiver. The cabinet body 10 includes a front frame 11, a rear cover 12, and a bottom housing 13, and a protector 14 is attached to a surface of the front frame 11 so as to cover an opening 111 of the front frame 11.
[0017]
The protector 14 is provided to protect a screen (described later) attached to the back of the front frame 11 and to improve the contrast and protect the viewer's eyes. The protector 14 is formed of a transparent or translucent plastic plate or the like. Filter. The protector 14 is attached to the front frame 11 with screws 15, and the screws 15 are fixed to, for example, four corners along the periphery of the protector 14 avoiding the image display surface, that is, along the edge of the opening 111 of the front frame 11. The screw 15 is preferably a decorative screw.
[0018]
Further, as shown in FIG. 1B, a back cover 12 is fixed to the back of the front frame 11 by using a fixing tool such as a screw 16, and the bottom housing 13 projects image light onto a screen. Optical device 100 is arranged. As the optical device, there are a projector using three projection tubes, a liquid crystal projector using three liquid crystal panels, and the like. The image projected from the optical device 100 is reflected by a mirror 200 and projected on the screen 17. ing.
[0019]
Next, a structure for attaching the protector 14 and the screen 17 to the front frame 11 will be described in detail with reference to FIGS. FIG. 2 is an exploded perspective view seen from the rear side of FIG. 1, and shows a state in which the front frame 11 is centered and the rear cover 12 is removed. FIG. 3 is a sectional view showing a main part of the protector mounting structure of the present invention.
[0020]
2, a plurality of ribs 18 are formed in the front frame 11 around the opening 111 so as to protrude inward. A plurality of bosses 19 are formed at four inner corners of the front frame 11. A screen 17 is accommodated in a space surrounded by the ribs 18, and the outer periphery of the screen 17 is surrounded by the ribs 18. It is fixed inside. The screen 17 includes a lenticular lens 171, a Fresnel lens, and 172.
[0021]
The mounting member 20 is composed of a rod-shaped main body 201 and a hook-shaped bent holding portion 202. The main body portion 201 is attached to the boss 19 with screws 21 as shown in FIG. The upper and lower ends of the screen 17 are sandwiched between the frame 11 and the frame 11.
[0022]
On the other hand, the protector 14 is provided with holes 141 at four corners thereof, and a plurality of bosses 22 (see FIG. 3) are provided on the surface of the front frame 11 so as to oppose the holes 141. These bosses 22 are provided at positions slightly shifted from the bosses 19, and each boss 22 has a screw hole.
[0023]
The screw 15 includes a screw portion 151 that is screwed into a screw hole of the boss 22 and a flange portion 152 having a diameter larger than the hole 141 of the protector 14. The screw 15 is attached to the boss 22 as shown in FIG. At this time, the upper end (and lower end) of the protector 14 is interposed between the flange 152 and the front frame 11.
[0024]
The length L1 of the boss 22 is set slightly longer than the thickness L2 of the protector 14, has a clearance represented by L1-L2 = L3, and the diameter L4 of the hole 141 of the protector 14 is 22 is set to be slightly larger than the outer diameter L5, and has a clearance indicated by L4-L5 = L6. With these clearances L3 and L6, the protector 14 can reduce expansion and contraction due to changes in temperature, humidity, and the like. Make it absorbable. That is, the protector 14 often expands and contracts in a direction parallel to the surface of the screen 17, and even if there is such expansion and contraction, it can be absorbed by the clearance L6. Further, since there is also a clearance L3 in a direction (thickness direction) orthogonal to the surface of the screen 17, a minute gap is formed between the front frame 11 and the flange 152 of the screw 15, and the protect 14 is in the surface direction. It does not bend even if it expands or contracts.
[0025]
Also, since the screen 17 has a structure sandwiched between the front frame 11 and the mounting bracket 20, even if there is expansion or contraction due to a change in temperature, humidity, or the like, it can be absorbed. That is, when the screen expands and contracts in a direction parallel to the surface of the screen 17, the screen can expand and contract vertically between the front frame 11 and the mounting bracket 20. Further, since the other end 202 of the mounting bracket 20 is elastically in contact with the screen 17, the other end 202 has a clearance in a direction (thickness direction) perpendicular to the surface of the screen 17. It does not bend even if it expands or contracts.
[0026]
As described above, in one embodiment of the present invention, even if the protector 14 and the screen 17 expand and contract due to a change in temperature, humidity, or the like, the protector 14 and the screen 17 can prevent the protector 14 and the screen 17 from bending and deforming. It is possible to prevent the quality of the displayed image from being reduced.
[0027]
Next, another embodiment of the present invention will be described with reference to FIG. FIG. 4 is a sectional view showing a main part of the protector mounting structure of the present invention, similarly to FIG.
[0028]
In the configuration of FIG. 4, the mounting bracket 20 is deleted, a boss 23 is formed to protrude from the inner surface of the front frame 11 against the boss 22, and a screw hole is formed in communication with the boss 22 and the boss 23. A screw 15 ′ having a longer screw portion 151 ′ than the screw 15 shown in FIG. 3 is attached to the boss 22, and the protector 14 and the screen 17 are sandwiched between the screw 15 ′ and the front frame 11. At the time of fixing, the screen 17 is also fixed at the same time. Note that the protector 14 has a size larger than the screen 17.
[0029]
In this embodiment, when the screw 15 'is tightened, the distance L7 between the front frame 11 and the flange 152 is set to be slightly larger than the total thickness L8 of both the protector 14 and the screen 17, and L7-L8 = L9 clearance.
3, the diameter L4 of the hole 141 of the protector 14 is set slightly larger than the outer diameter L5 of the boss 22, and has a clearance represented by L4−L5 = L6.
[0030]
Therefore, the protectors 14 and the screen 17 can absorb expansion and contraction due to changes in temperature and humidity due to the clearances L6 and L9. In addition, when the protector and the screen are mounted, the protector and the screen can be mounted by tightening the screws 21 and 15 in the example of FIG. 3, and can be mounted only by tightening the screw 15 ′ in the example of FIG. Can be.
[0031]
By using decorative screws for the screws 15 and 15 ', even if the screws are exposed on the surface, the appearance is not spoiled in design.
[0032]
【The invention's effect】
As described above, according to the present invention, even if the protector and the screen expand and contract due to a temperature change or the like, they can be absorbed. Further, the protector and the screen can be mounted by a simple structure.
[Brief description of the drawings]
FIG. 1 is a perspective view and a side view showing an external structure of an image display device of the present invention.
FIG. 2 is an essential part exploded perspective view showing one embodiment of a protector mounting structure in the image display device of the present invention.
FIG. 3 is a sectional view of a main part showing an embodiment of the image display device protector mounting structure of the present invention.
FIG. 4 is a cross-sectional view of a principal part showing another embodiment of the image display device protector mounting structure of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 ... Cabinet main body 11 ... Front frame 12 ... Back cover 13 ... Bottom housing 14 ... Protector 141 ... Hole 15, 15 '... Screw 151, 151' ... Screw part 152 ... Flange part 17 ... Screen 18 ... Rib 19 ... Boss 20 ... Mounting bracket 22 ... Boss

Claims (7)

A cabinet body having a front frame having an opening in a front portion, a screen attached to the back side of the front frame so as to close the opening of the front frame, and the front face so as to close the opening of the front frame. An image display device comprising a protector attached to the front side of the frame and displaying an image on the back of the screen,
An outer peripheral portion of the protector is attached to the front frame with a predetermined amount of clearance in a first direction parallel to a display surface of the image and a second direction orthogonal to the display surface. First mounting means;
Second mounting means for mounting the outer peripheral portion of the screen to the front frame with a predetermined amount of clearance in the first direction and the second direction. An image display device characterized by the above-mentioned. A plurality of first bosses protruding from the front surface of the front frame around the opening and having a dimension longer than the thickness of the protector; and a first boss respectively opposed to the first boss. A hole having an inner diameter larger than the outer diameter of the first boss; a screw portion screwed into the first boss; and a flange having an outer diameter larger than the inner diameter of the hole. Consisting of a screw consisting of
The invention is characterized in that the protector is mounted on a front frame so that the first boss enters the hole, and the screw is screwed into the first boss from outside the protector and fixed. Item 2. The image display device according to Item 1. The second mounting means includes a plurality of second bosses formed protruding from the rear side of the front frame around the opening, one end of the second boss being mounted on the first boss, and the other end facing the screen. And extending mounting brackets,
The image display device according to claim 1, wherein an end of the screen is held between the front frame and the other end of the mounting bracket. A cabinet body having a front frame having an opening in the front,
A plurality of first bosses formed to protrude toward the front side of the front frame around the opening and having a dimension longer than the thickness of the protector;
A protector in which holes having an inner diameter larger than an outer diameter of the first boss are formed respectively opposing the first boss;
A screw comprising a screw portion screwed into the first boss and a flange portion having an outer diameter larger than the inner diameter of the hole;
A plurality of second bosses formed so as to protrude on the back side of the front frame around the opening;
A mounting bracket having one end attached to the second boss and the other end extending toward the opening;
A screen attached to the back side of the front frame so as to close the opening of the front frame,
The protector is mounted on the front frame so that the first boss is inserted into the hole, and the screw is screwed into the first boss from outside the protector and fixed, and the front frame and the mounting bracket are fixed. An end portion of the screen is sandwiched between the other end of the image display device. A cabinet body having a front frame having an opening formed in the front, a screen attached to the front side of the front frame so as to cover the opening of the front frame, and a screen having a size larger than the screen; And a protector attached to the front frame so as to cover the surface of the image display device, wherein an image is displayed on the back of the screen,
The outer peripheral portion of the protector and the screen has a predetermined amount of clearance with respect to the front frame in a first direction parallel to a display surface of the image and a second direction orthogonal to the display surface. An image display device comprising third attachment means for attachment. A plurality of first bosses formed so as to protrude from a surface side of the front frame around the opening and having a dimension longer than a total thickness of the protector and the screen; A hole formed in the protector to oppose each boss, the hole having an inner diameter larger than the outer diameter of the first boss, a screw portion screwed into the first boss, and an outer diameter larger than the inner diameter of the hole; And a screw comprising a flange having
The protector and the screen are overlapped so that the protector faces the front side, and the protector is attached to a front frame so that the first boss is inserted into the hole, and the screw is screwed into the first boss from outside the protector. 6. The image display device according to claim 5, wherein the screen is inserted and the protector and the screen are sandwiched and fixed between the flange of the screw and the front frame. A cabinet body having a front frame having an opening in the front,
A plurality of bosses having a predetermined length dimension formed to protrude toward the front side of the front frame around the opening;
A screen attached to the front side of the front frame so as to close the opening of the front frame,
A protector having a dimension larger than the screen, and having a hole having an inner diameter larger than an outer diameter of the boss, each of which opposes the boss,
Comprising a screw portion screwed into the first boss and a screw having a flange portion having an outer diameter larger than the inner diameter of the hole,
The length of the boss is longer than the total thickness of the protector and the screen, the protector and the screen are overlapped so that the protector is on the front side, and the front frame is so positioned that the boss enters the hole. An image display device, wherein the screw is screwed into the boss from outside the protector, and the protector and the screen are sandwiched and fixed between a flange portion of the screw and the front frame. .

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