JP3473616B2 - Projection display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention decomposes a light beam from a light source into three color light beams of red, blue and green, and modulates each of these color light beams through a panel such as a liquid crystal panel in accordance with image information. The present invention relates to a projection display device that recombines modulated light beams of each color after being modulated by a light combining unit, and enlarges and projects through a projection unit.

More specifically, the present invention relates to a mechanism for attaching a liquid crystal panel to a prism composite constituting light combining means in a projection type display device of this type.

[0003]

2. Description of the Related Art In a projection display apparatus having the above-mentioned structure, a liquid crystal panel as a light valve is mounted on a light incidence surface of each color light beam of a prism composite as a light combining means. As a mechanism for attaching the liquid crystal panel to the prism composite, there is, for example, a mechanism disclosed in Japanese Patent Application Laid-Open No. 6-118368. In this type of mounting mechanism, a liquid crystal panel as a light valve is directly attached and fixed to the light incident surface of the prism composite with an adhesive.

When the light valve is bonded and fixed, in particular, mutual pixel alignment adjustment (alignment adjustment) of a plurality of light valves that modulate light separated into red, green, and blue light.
And a mechanism for adjusting (focus adjustment) so that each image forming surface to be a subject is located within the allowable depth of focus of the projection lens can be omitted. Therefore, the size and weight of the optical system of the projection display device can be reduced, and the number of components can be reduced.

[0005]

However, when the light valve is directly bonded and fixed to the light incident surface of the prism composite, there are the following problems to be solved.

First, when external light enters the inside of the apparatus from the outside, there is a possibility that the external light may enter the light valve. When receiving such intrusion light, each element of the light valve may malfunction.

Second, it is not preferable to handle the light valve while directly touching the light valve, since such a problem as damage to the light valve occurs. For example, when the light valve is directly chucked by a jig when the light valve is bonded to the prism composite, the edge, corner, and the like of the light valve may be damaged. In addition, when a light valve that is weak against static electricity, such as a liquid crystal panel, is used, it is not preferable for an operator to directly hold the light valve and stick it to the prism composite.

Third, the light valve adhered to the prism composite may have a defect or the like in a part of the pixel due to a change with time. If a defect occurs in the light valve, it must be replaced with a new one. However, it is difficult to replace only defective light valves because the light valves are adhesively fixed to the prism composite. That is, it is not easy to remove only the liquid crystal panel adhered and fixed thereto without damaging the light incident surface of the prism composite. Thus, for example,
In some cases, the prism composite must be replaced, which is not economical.

An object of the present invention is to realize a projection display device having a light valve mounting mechanism capable of solving such problems.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention decomposes a light beam from a light source into light beams of a plurality of colors, and modulates each color light beam through a panel so as to correspond to image information. The modulated light flux of each color after the re-synthesis is recombined by the light combining means, and in a projection display device that enlarges and projects through the projection means, the periphery of the panel is protected so that invasion of external light, breakage, etc. do not occur, A configuration is adopted in which the panel does not have to be directly adhered and fixed to the photosynthesis means.

That is, in the present invention, a fixed frame plate fixed to the light incident surface of the light synthesizing means, and a panel frame plate composed of a first frame plate and a second frame plate sandwiching the panel are provided. An intermediate frame plate disposed between the panel frame plate and the fixed frame plate, and fixing means for detachably fixing the intermediate frame plate to the fixed frame plate; Are fixedly bonded to the intermediate frame plate through wedges, and the
Cooling air in the gap formed between the flannel frame plate and the intermediate frame plate.
The wedges surround the first frame plate so that
The structure provided in the right and left parts of the is adopted.

Further, the present invention adopts a configuration in which a projecting frame is formed on the fixed frame plate and the intermediate frame plate. The panel is mounted on the projecting frame.
It is preferable that it is held in a state . Further, a fan may be arranged below the light combining means. In this case, the projecting frame forms a cooling channel, and the cooling efficiency can be improved.

On the other hand, it is also possible to adopt a configuration in which the fixed frame plate and the intermediate frame plate of the present invention have a flat shape. Even in this case, a fan may be arranged below the photosynthesis unit. Further, a current plate may be arranged between the light combining means and the fan. With this configuration, the cooling efficiency can be improved by directly guiding the cooling air to the panel. Also, the photosynthesis means is
A rhythmic composite, the left and right sides of the surrounding wall being the panel
Is preferably on the short side .

Further, the present invention has a temporary fixing means for temporarily fixing the intermediate frame plate and the fixed frame plate, and the temporary fixing means is formed on one of the intermediate frame plate and the fixed frame plate. It is possible to adopt a configuration in which the engaged projection piece engages with the engagement hole formed in the other. In this case, the positioning accuracy of the frame plates can be further improved.

Also, the present invention employs a structure having a temporary fixing means for temporarily fixing the intermediate frame plate and the panel frame plate, and the intermediate frame plate temporarily fixed by the temporary fixing means and It is desirable that the panel frame plate be positioned by the positioning means. With this configuration, the positioning operation can be performed in a temporarily fixed state, so that the positioning operation can be easily performed.

The temporary fixing means for temporarily fixing the intermediate frame plate and the panel frame plate includes an engaging projection formed on one of the intermediate frame plate and the panel frame plate, It can be configured to engage with an engagement hole formed in the frame plate. In this case, the engaging portion between the engaging hole and the engaging protrusion may be temporarily fixed with an adhesive.

In the projection display apparatus of the present invention having the above-described structure, the panel is held by the panel frame plate. Further, a fixed frame plate is fixed to the light incident surface of the light combining means, and a panel frame plate holding a panel is detachably fixed to the fixed frame plate via an intermediate frame plate.

Accordingly, when a defect occurs due to the aging of the panel, the panel frame plate holding the panel is detached from the fixed frame plate fixed to the photosynthesis means.
What is necessary is just to attach the panel frame plate holding the new panel to the fixed frame plate. As described above, since the panel is not directly fixed to the photosynthesis means, the panel replacement work can be easily performed, and the surface of the photosynthesis means is not damaged during the replacement work.

Further, in the projection display device of the present invention, since the periphery of the panel is protected by the panel frame plate, it is necessary to work while directly touching the panel when attaching to the photosynthesis means or the like. There is no. Therefore, damage to the panel can be prevented. Further, in a state where the projection display device is used by being incorporated, since the outer periphery is covered with the panel frame plate, there is no possibility that external light may enter and malfunction may occur.

A liquid crystal device can be used as the panel. The present invention is particularly effective for a liquid crystal device which is susceptible to static electricity and is liable to malfunction due to invasion of external light.

Further, as the above-mentioned panel, there are a light transmission type panel and a light reflection type panel. In the case of using a light reflection type panel, the light synthesizing means generally also serves as a light separating means for decomposing a light beam from a light source into a light beam of a plurality of colors.

As the projection type display device, there are a front projection type display device in which projection is performed from the side observing the projection surface, and a rear projection type display device in which projection is performed from a direction opposite to the side observing the projection surface. Although there are two types, the present invention is applicable to both types.

When a dichroic prism is used as the light combining means, the panel is positioned and fixed on the surface of the dichroic prism by using a fixed frame plate, a panel frame plate, a fixing means, and a positioning means. Can be applied to a structure in which a solid-state imaging device such as a CCD is positioned and fixed to a color separation prism in a camera or the like. Further, the first frame plate and the wedge are
A resin molded product, wherein the wedge is a material that transmits ultraviolet light.
It is preferred that it comprises a material.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a projection type display device to which the present invention is applied will be described with reference to the drawings.

(Overall Configuration) FIG. 1 shows the appearance of a projection display apparatus to which the present invention is applied. The outer case 2 of the projection display device 1 of this example has a rectangular parallelepiped shape. The outer case 2 basically includes an upper case 3, a lower case 4, and a front case 5 that defines the front of the apparatus.
It is composed of The front end portion of the projection lens unit 6 projects from the center of the front case 5.

FIG. 2 shows the arrangement of each component in the exterior case 2 of the projection display device 1. As shown in this figure, a power supply unit 7 is disposed at the rear end side inside the outer case 2. A light source lamp unit 8 and an optical unit 9 are disposed at a position adjacent to the front side of the apparatus. Optical unit 9
The base end side of the projection lens unit 6 is located at the center of the front side of. On the other hand, on one side of the optical unit 9, an interface board 11 on which an input / output interface circuit is mounted is arranged in the front-rear direction of the apparatus, and in parallel with this, a video board 12 on which a video signal processing circuit is mounted Are located. Further, a control board 13 for controlling driving of the apparatus is disposed above the light source lamp unit 8 and the optical unit 9. Speakers 14R and 14L are arranged at the left and right corners on the front end side of the device, respectively.

A cooling air intake fan 15A is arranged at the center of the upper surface of the optical unit 9, and a circulation fan 15B for forming a cooling circulation flow is arranged at the center of the lower surface of the optical unit 9.
Is arranged. An exhaust fan 16 is disposed on the side of the apparatus, which is the back side of the light source lamp unit 8. An auxiliary cooling fan 17 for sucking cooling airflow from the intake fan 15A into the power supply unit 7 is disposed at a position facing the ends of the substrates 11 and 12 in the power supply unit 7.

Further, immediately above the power supply unit 7, an FDD unit 18 is disposed at a position on the left side of the power supply unit.

(Optical Unit and Optical System) FIG. 3 (A)
Shows the part of the optical unit 9. As shown in this figure, the optical unit 9 has a configuration in which optical elements other than the prism unit 20 constituting the color synthesizing means are held between upper and lower light guides 901 and 902 from above and below. ing. The upper light guide 901 and the lower light guide 902 are respectively provided in the upper case 3
And is fixed to the lower case 4 side by a fixing screw. The upper and lower light guide plates 901, 9
Numeral 02 is fixed to the prism unit 20 by the same fixing screw.

The prism unit 20 is fixed to the back surface of a thick head plate 30, which is a die-cast plate, with fixing screws. On the front surface of the head plate 30, the base end side of a projection lens unit 6 as a projection means is fixed by fixing screws. Therefore, in the present example, the prism unit 20 and the projection lens unit 6 are fixed so as to be integrated with the head plate 30 interposed therebetween. These two parts are integrated with the highly rigid head plate 30 interposed therebetween. Therefore, even if an impact or the like acts on the side of the projection lens unit 6, no displacement occurs between these two members.

FIG. 3B shows a schematic configuration of an optical system incorporated in the projection display device 1. The optical system of this example includes a light source lamp 805, an illumination optical system 923 including integrator lenses 921 and 922, which are uniform illumination optical elements, and a white light beam W emitted from the illumination optical system 923, which is used for red and green light. , A color separation optical system 924 that separates each color light beam R, G, and B, and three liquid crystal panels 40R, 40G, and 4 as light valves that modulate each color light beam.
OB, a prism combining body 20 as a color combining optical system for recombining the modulated color light flux, and a projection lens unit 6 for enlarging and projecting the combined light flux on a projection surface.
In addition, it has a light guide system 927 for guiding the blue light flux B among the respective color light fluxes separated by the color separation optical system 924 to the corresponding liquid crystal panel 40B.

As the light source lamp 805, a halogen lamp, a metal halide lamp, a xenon lamp or the like can be used. The uniform illumination optical system 923 includes the reflection mirror 9.
31 and the optical axis 1a of the light emitted from the illumination optical system.
Is bent at a right angle toward the front of the device. With this mirror 931 interposed, the integrator lens 9
21, 922 are arranged in a state orthogonal to the front and rear.

The color separation optical system 924 includes a blue-green reflecting dichroic mirror 941 and a green reflecting dichroic mirror 94.
2 and a reflection mirror 943. White luminous flux W
First, in the blue-green reflecting dichroic mirror 941, the blue light beam B and the green light beam G contained therein are reflected at right angles, and the green reflecting dichroic mirror 942
Head towards. The red light flux R passes through the mirror 941, is reflected at a right angle by the rear reflection mirror 943, and is emitted from the emission section 944 of the red light flux toward the prism composite 20. The blue and green luminous fluxes B and G reflected by the mirror 941 are reflected only at a right angle by the green reflection dichroic mirror 942, and are emitted from the green luminous flux emission section 945 to the color combining optical system side. You. The blue light flux B that has passed through the mirror 942 is emitted from the emission section 946 of the blue light flux toward the light guide system. In this example, the color separation optical system 9 is output from the white light beam emitting portion of the uniform illumination optical element.
24, the emission portions 944, 945, and 946 of the light beams of the respective colors.
Are set so that the distances to all are equal.

The emission section 9 of each color light beam of the color separation optical system 924
Condensing lenses 951, 952, and 953 are disposed on the exit sides of the light emitting devices 44, 945, and 946, respectively. Therefore, each color light beam emitted from each emission unit is incident on these condenser lenses 951, 952, 953 and is parallelized.

The color light beams R, G,
Among B, red and green luminous fluxes R and G represent liquid crystal panel 4
The light is modulated by being incident on 0R and 40G, and image information corresponding to each color light is added. That is, these liquid crystal panels 4
The switching of the 0R, 40G, and 40B is controlled by an image signal corresponding to image information by a driving unit (not shown), and thereby, each color light passing therethrough is modulated. As such a driving means, a known means can be used as it is. On the other hand, the blue luminous flux B is guided to the corresponding liquid crystal panel 40B via the light guide system 927, where it is similarly modulated according to image information. In addition,
The liquid crystal panels 40R, 40G, and 40B of the present example include, for example,
A device using a polysilicon TFT as a switching element can be used.

The light guide system 927 includes an incident side reflection mirror 971.
, An output-side reflection mirror 972, an intermediate lens 973 disposed therebetween, and a condenser lens 953 disposed on the front side of the liquid crystal panel 40B. The light path length of each color light beam, that is, the distance from the light source lamp 805 to each liquid crystal panel, is the longest for the blue light beam B, and therefore, the light amount loss of this light beam is the largest. However, the light guide system 927
The loss of the light amount can be suppressed by interposing. Therefore, the optical path length of each color light beam can be made substantially equivalent. Next, each color light flux modulated through each of the liquid crystal panels 40R, 40G, and 40B is incident on the prism composite 22, where it is recombined. In this example, a color combining optical system is configured using a prism combining body 22 composed of a dichroic prism. The color image recombined here is
The image is enlarged and projected onto a projection surface 7 at a predetermined position via the projection lens unit 6.

(Structures of Prism Unit and Head Plate) FIG. 4 shows the head plate 30 and the prism unit 20 attached to the head plate 30 in an extracted manner. As shown in this figure, the head plate 30 is basically composed of a vertical wall 31 extending vertically in the width direction of the apparatus and a bottom wall 32 extending horizontally from the lower end of the vertical wall 31. . The prism unit 20 is provided on the vertical wall 31.
A rectangular opening 31b through which the light emitted from the light source passes is formed. Further, a large number of reinforcing ribs are formed on the vertical wall 31 to increase its rigidity. This vertical wall 31
With the prism unit 20
And the projection lens unit 6 is fixed (FIG. 3
(A)). Therefore, these are highly integrated, and even if an impact force or the like is applied, there is a very small possibility that mutual positional displacement occurs.

The prism unit 20 is provided on the upper surface of the bottom wall 32 of the head plate 30. Prism unit 2
0 denotes four prisms 2 each having a right-angled isosceles triangle cross section.
1 includes a prism composite 22 having a rectangular parallelepiped shape formed by joining their slopes to each other (see FIG. 5), and a prism support plate 33. The bottom of the prism composite 22 is fixed to the surface of the prism support plate 33 by means such as adhesion, and the prism support plate 33 is fixed to the bottom wall 32 of the head plate. Of the side surfaces of the prism composite 22, three side surfaces functioning as light incident surfaces are respectively provided with liquid crystal panel units 50 having the same structure.
R, 50G, and 50B are attached. Each of the liquid crystal panel units 50R, 50G, and 50B holds a liquid crystal panel 40R, 40G, and 40B, respectively.

(Mounting Structure of Liquid Crystal Panel) FIG. 5 shows the liquid crystal panel unit 50R holding the liquid crystal panel 40R among the liquid crystal panel units 50R, 50G and 50B.
Each component of R is shown exploded. With reference to this figure, a mounting structure for mounting the liquid crystal panel 40R to the prism composite 22 will be described.

As shown in FIG. 5, the liquid crystal panel unit 5
0R is a panel frame plate 5 holding the liquid crystal panel 40R.
1, the panel frame 51 is provided with a first frame plate 52 and a second
Frame plate 53 is provided. The liquid crystal panel 40R is held between the frame plates 52 and 53 in a state of being sandwiched therebetween.

The liquid crystal panel unit 50R further includes a fixed frame plate 54 that is bonded and fixed to the light incident surface 22R of the prism composite 22. The panel frame plate 51 includes the intermediate frame plate 5
5 and is detachably fixed to the fixed frame plate 54 side.

The structure of each part will be described in detail. First, the panel frame plate 51 will be described.
Is provided with a rectangular opening 52a for light passage, and a peripheral wall 52b having a constant thickness is formed on four sides. The second frame plate 53 also has a rectangular opening 53a for light passage. The second frame plate 53 is sized to fit inside the peripheral wall 52b of the first frame plate 52. In the center of the left and right edges of the second frame plate 53, an engagement protrusion 53 is provided.
c is formed. The engagement grooves 52c into which the engagement protrusions 53c fit are formed on the left and right peripheral walls 52b of the first frame plate 52.
Is formed at the center of the outer surface. Therefore, if the liquid crystal panel 40R is sandwiched between the first and second frame plates 52 and 53, and the liquid crystal panel 40R is overlapped with each other, and the engaging projections 53c are fitted into the corresponding engaging grooves 52c, these frames are formed. Plate 52,
A panel frame 51 is held in a state where the liquid crystal panel 40 </ b> R is sandwiched between 53.

The intermediate frame plate 55 is a rectangular frame formed to be substantially the same as or slightly larger than the first frame plate 52 of the panel frame plate 51, and has a rectangular opening 55a for light passage. . This intermediate frame plate 55 has a rectangular opening 55
a engaging projections 55 d extending vertically from the surface of the frame plate at the four corners
Are formed. On the other hand, on the side of the first frame plate 52 of the panel frame plate 51, an engagement hole 52d into which these can be inserted is formed at a position corresponding to each engagement projection 55d. Therefore, in each of the engagement holes 52d of the panel frame plate 51,
When the engagement protrusions 55d of the intermediate frame plate 55 are aligned and overlapped with each other, a state is formed in which the engagement protrusions 55d are inserted into the respective engagement holes 52d and can be temporarily fixed.

On the other hand, the fixed frame plate 54 is also a rectangular frame plate having a rectangular opening 54a for transmitting light. This fixed frame plate 5
4 is fixed to the light incident surface 22R of the prism composite 22 with an adhesive. Screw holes 54c are formed in the upper left and right corners of the fixed frame plate 54. Screw holes 55c are also formed in the intermediate frame plate 55 corresponding to these screw holes 54c.

A projecting frame 54 b projecting toward the intermediate frame plate 55 is formed in the lower frame portion of the fixed frame plate 54. The lower frame portion of the intermediate frame plate 55 includes
A protruding frame 55b is formed in a shape in which b is fitted from the back side. The panel frame plate 51 is held in a state of riding on these protruding frames 54b, 55b. The projecting frames 54b and 55b have two screw holes 54 on the left and right.
e, 55e are formed.

As described above, the fixed frame plate 54 and the intermediate frame plate 55 are provided with the screw holes 54c and 54e at positions corresponding to each other.
And 55c, 55e are formed, and these are fastened and fixed by four countersunk screws 56 (only one is shown in the figure) screwed into these screw holes. That is, the intermediate frame plate 55 is screwed to the fixed frame plate 54 attached to the prism composite 22.

Further, the liquid crystal panel unit 50R has four wedges 57 as positioning means. FIG. 5 shows only one of them. This wedge 57
The wedge guide surface 52e with which the inclined surface 57a of the panel frame 51 abuts is formed on the left and right peripheral walls of the first frame plate 52 of the panel frame plate 51. After temporarily fixing the panel frame plate 51 to the intermediate frame plate 55, four wedges 57 are driven into the left and right sides of the first frame plate 52, and the amount of pushing of these wedges 57 is adjusted to position the liquid crystal panel 40R. Is to be performed.

The liquid crystal panel unit 50R having this configuration is mounted on the light incident surface 22R of the prism composite 22 in the following procedure. First, a panel frame plate 51 holding the liquid crystal panel 40R is prepared. Next, the fixed frame plate 54 is positioned and bonded and fixed to the surface 22R of the prism composite 22. As the adhesive, an ultraviolet curable adhesive or the like can be used. Next, on the surface of the fixed frame plate 54 bonded and fixed,
The intermediate frame plate 55 is positioned, and the intermediate frame plate 55 is screwed with four screws 56. Thereafter, the panel frame plate 51 holding the liquid crystal panel 40R is positioned on the intermediate frame plate 55 and temporarily fixed thereto. That is, the engaging projection 55d of the intermediate frame plate 55 is matched with the engaging hole 52d of the panel frame plate 51, and in this state, the panel frame plate 51
Into the intermediate frame plate 55. The fixed frame plate 54
Before bonding to the prism composite 22, the fixing frame plate 5
If the screw 4 and the intermediate frame plate 55 are integrated beforehand, the positional accuracy can be easily obtained.

Thereafter, the liquid crystal panel 40R is positioned with respect to the surface 22R of the prism composite 22 using the wedge 57 as a positioning means. That is, the four wedges 57 are temporarily fixed to the panel frame plate 51 and the intermediate frame plate 55 along the wedge guide surface 52e formed on the first frame plate 52.
Insert between. Then, by adjusting the insertion amount of each wedge 57, the alignment adjustment and the focus adjustment of the liquid crystal panel 40R are performed.

When the positioning is completed, these wedges 5
7 is bonded and fixed to the panel frame plate 51 and the intermediate frame plate 55, which are members to be positioned, using an adhesive. As the adhesive used in this case, an ultraviolet curable adhesive can be used.

Here, the operation of positioning the wedge 57 and the operation of bonding and fixing the wedge 57 will be described in more detail according to the order of the steps.

First, the focus surface of the liquid crystal panel 40G is adjusted within the focus surface of the projection lens 6 by using a dedicated adjusting device. In this state, as described above, the intermediate frame plate 55
An ultraviolet-curing adhesive is injected into a gap formed by the engagement projection 55d of the panel frame 51 entering the engagement hole 52d of the panel frame plate 51,
It is cured and temporarily fixed by ultraviolet irradiation. Next, the intermediate frame plate 55 and the wedge guide surface 52e provided on the first frame plate 52 are adhered to the ultraviolet curable adhesive by irradiating ultraviolet rays from the exposed end surface of the wedge 57 to perform permanent fixing. LCD panel 4
Liquid crystal panel 4 arranged at the center of 0G, 40R, 40B
Similarly, with reference to 0G, the focus adjustment of the liquid crystal panels 40R and 40B and the pixel alignment adjustment between the liquid crystal panels 40R and 40B are performed, and the temporary fixing and the permanent fixing are performed.

Since the temporary fixing operation is performed by setting the prism composite body 22 and the projection lens 6 on the head plate 30 in the adjusting device, it is possible to perform the optimal adjustment according to the characteristics of each component. The chucking of the panel frame plate 51 to the adjusting device is performed based on the outer shape of the first frame plate 52.

Liquid crystal panel 40 other than liquid crystal panel 40R
G, a liquid crystal panel unit 50G holding 40B,
50B also has the same structure, and a description thereof will be omitted.

In this way, the liquid crystal panel unit 50 is attached to the three surfaces 22R, 22B, and 22G of the prism composite 22.
The state in which R, 50G, and 50B are attached is the state shown in FIG. In FIG. 4, members extending upward from each of the liquid crystal panel units 50R, 50G, 50B are flexible cables 41R, 41G for wiring,
41B.

According to the liquid crystal panel unit 50R configured as described above, the following effects can be obtained.

First, the liquid crystal panel 40R is in a state where its four peripheral edges are covered and protected by a rectangular panel frame plate 51. Therefore, there is no need to directly touch the liquid crystal panel 40R to perform the mounting operation on the side of the prism composite 22. For this reason, it is possible to prevent the liquid crystal panel 40R from being damaged or lost due to hitting another portion or the like. A panel frame plate 51 is provided around the liquid crystal panel 40R.
And can block external light. Therefore, no malfunction occurs in the liquid crystal panel 40 due to the invasion of external light.

Second, the panel frame plate 51 holding the liquid crystal panel 40R is screwed to and detachable from the surface 22R of the prism composite 22 via the intermediate frame plate 55. Therefore, for example, when a defect occurs in the liquid crystal panel 40R, it can be replaced by a simple operation of removing the screw 56. Also, since the liquid crystal panel 40R is not directly bonded and fixed to the prism composite 22, the replacement of the prism composite 22 does not damage the side of the prism composite 22 and the expensive components can be used without waste. it can.

Third, the panel frame 51 holding the liquid crystal panel 40R can be temporarily fixed to the intermediate frame plate 55. After forming this temporary fixing state, using the wedge 57,
The positioning between the liquid crystal panel 40R and the surface 22R of the prism composite 22 can be performed. Since the temporary fixing state can be formed in this manner, the positioning operation using the wedge 57 can be easily performed in a separate step, which contributes to an improvement in the cycle time of the equipment.

Here, as the wedge 57, a glass wedge can be used in general. However, when the first frame plate 52 is made of a resin molded product, the coefficient of thermal expansion is larger than that of glass, so that the wedge 57 is easily separated from these frame plates due to the difference in thermal expansion, May be destroyed by temperature changes. To avoid this,
It is desirable that the wedge 57 be an acrylic resin molded product. In addition, since the wedge 57 is made of an acrylic material, molding can be performed, so that the cost can be significantly reduced as compared with a glass agent. By using a material that transmits ultraviolet light as the material of the wedge 57, an ultraviolet curable adhesive that has a small temperature rise and a short curing time can be used as an adhesive for bonding and fixing the wedge 57.

Since the wedge guide surface 52e is formed on the first frame plate 52, the upper end surfaces 52f, 52
g are formed, and the wedge 57 is guided by these three surfaces. That is, this portion is filled with an adhesive to
Is inserted, the wedge 57 is automatically moved inside by being guided by these three surfaces due to the surface tension of the adhesive. Therefore, it is strong against disturbances encountered in the process,
The mounting work of the wedge 57 is simple.

In this embodiment, an adhesive is used for temporarily fixing the panel frame plate 51 to the intermediate frame plate 55, but soldering or the like may be used instead. When the first frame plate 52 and the like are made of resin, a material in which a metal member is attached to a joint portion or a material in which a metallized layer is formed in a joint portion may be used.

Next, the first frame plate 52, the intermediate frame plate 5
5. The fixed frame plate 54 can be a molded product of thermosetting resin mixed with glass fiber or calcium carbonate. When such a resin material is used, its thermal expansion coefficient is closer to that of glass as compared with a general resin material. For this reason, it is possible to avoid a pixel shift or the like caused by thermal deformation in a state where the pixel is bonded to the prism composite 22.

Here, as the adhesive for adhering and fixing the fixing frame plate 54 to the prism composite 22, an ultraviolet-curable adhesive can be used as described above. It is desirable to apply a base treatment material. That is, in the prism composite 22,
As described above, the incident surface 22R of the red light beam and the incident surface 22B of the blue light beam face each other. Since the blue light beam has a short wavelength, a part of the blue light beam may pass through the reflection film of the prism composite 22 and reach the opposite red light beam incident surface 22R. When such backlight is incident on the liquid crystal panel 40R, a malfunction occurs. In order to avoid this, a filter is generally attached to the incident surface 22R of the red light beam to block such backlight.

The reason that the filter is attached only to the incident surface 22R of the red light beam is because the effect of the backlight of the blue light beam is the largest, but this is not the case when the influence of the backlight of the other light beam is great. A filter may be provided on another surface, or a filter may be provided on a plurality of surfaces.

However, if such a filter is present, the ultraviolet rays at the time of bonding and fixing are blocked, and the fixed frame plate 54 is moved to the entrance surface 22 of the prism composite 22.
There is a possibility that the UV-curable adhesive for bonding and fixing to R, 22G, and 22B may have insufficient UV irradiation. By avoiding this adverse effect, the fixed frame plate 54 can be securely connected to the entrance surface 2.
In order to bond and fix the 2R, it is desirable to apply a base treatment material to these bonding surfaces and to use an anaerobic type adhesive in combination as described above. Of course, the same processing may be performed on the incident surface where such a filter does not exist.

Although the use of an ultraviolet-curable adhesive has been described as the adhesive, other adhesives may be used. For example, if the fixing and fixing of the fixing frame plate 54 and the fixing of the wedge 57 are performed by using a hot-melt type adhesive, it is not necessary to consider the problem caused by the filter. (First Modification of Liquid Crystal Panel Unit 50R) When it is not necessary to temporarily fix the panel frame 51 to the intermediate frame plate 55, as shown in FIG.
The temporary fixing mechanism formed between them may be omitted. That is, the engagement hole 52d formed on the panel frame plate 51 side and the engagement protrusion 55d formed on the intermediate frame plate 55 side may be omitted. In this case, the panel frame 51 is fixed to the intermediate frame 55 by only the wedge 57.

The liquid crystal panel unit 50 having the structure shown in FIG.
Even when the 0R is used, the liquid crystal panel unit 50
The first and second effects obtained by R can be obtained, and it is effective to reduce the size of the prism unit 20.

(Second Modification of Liquid Crystal Panel Unit 50R) FIG. 7 shows an exploded state of a liquid crystal panel unit 70R according to a second modification of the liquid crystal panel unit 50R. Parts corresponding to the liquid crystal panel unit 50R shown in FIG. 5 are denoted by the same reference numerals, and description thereof will be omitted.

As shown in FIG. 7, the liquid crystal panel unit 7
0R is a panel frame plate 7 holding the liquid crystal panel 40R.
1 is provided. The panel frame plate 71 includes the first and second panels similarly to the panel frame plate 51 of the liquid crystal panel unit 50R.
And the liquid crystal panel 40R is sandwiched and held between these frame plates. In the figure, only the first frame plate 72 is shown, and the second frame plate 73 and the liquid crystal panel 40R are already the first frame plate 72.
2 shows a state where it is attached and fixed to the side. The liquid crystal panel unit 70R further includes a fixed frame plate 74 that is bonded and fixed to the light incident surface 22R of the prism composite 22.
The panel frame plate 71 is detachably fixed to the fixed frame plate 74 via an intermediate frame plate 75.

The panel frame plate 71 is basically the same as the panel frame plate 51 of the liquid crystal panel unit 50R described above. The first frame plate 72 has a rectangular opening 72a for light passage.
And a peripheral wall 72 of a constant thickness
b is formed. The second frame plate 73 also has a rectangular opening (not shown) for light passage. The second frame plate 73 is sized to fit exactly inside the peripheral wall 72b of the first frame plate 72. Therefore, the first and second
When the liquid crystal panel 40R is sandwiched between the frame plates 72, 73, the second frame plate 73 is inserted into the first frame plate 72, and the liquid crystal is interposed between the frame plates 72, 73. Panel 40R
Is held in a state in which is sandwiched.

Here, the fitting structure of the first frame plate 72 and the second frame plate 73 is basically the first and second frame plates constituting the panel frame plate 51 shown in FIG. 52, 5
Same as 3. However, in the case of this example, the hook and the engaging groove with which the hook engages are formed at upper and lower positions sandwiching the guide grooves 72e to 72g of the first frame plate 72. Illustration of these parts is omitted.

Next, the intermediate frame plate 75 is a rectangular frame having substantially the same size as the first frame plate 72 of the panel frame plate 71, and has a rectangular opening 75a for light passage. This intermediate frame plate 7
In 5, engagement protrusions 75 d extending vertically from the surface of the frame plate are formed at four corners of the rectangular opening 75 a. On the other hand, on the side of the first frame plate 72 of the panel frame plate 71, an engagement hole 72d into which these can be inserted is formed at a position corresponding to each engagement projection 75d. Therefore, the engaging projections 75 of the intermediate frame 75 are provided in the respective engaging holes 72d of the panel frame 71.
When b is overlapped with each other, a temporary fixing state is formed in which each engaging projection 75d is inserted into each engaging hole 72d.

On the other hand, the fixed frame plate 74 is also a rectangular frame plate in which a rectangular opening 74a for transmitting light is formed. This fixed frame plate 7
4 is fixed to the light incident surface 22R of the prism composite 22 with an adhesive. Screw holes 74c are formed at both corners of the upper frame portion of the fixed frame plate 74 and at the center in the left-right direction of the lower frame portion of the fixed frame plate 74. The intermediate frame plate 75 corresponding to these three screw holes 74c also has screw holes 75c.
Are formed. In the corresponding screw holes 74c, 75c,
The intermediate frame plate 75 is fixed to the fixed frame plate 74 by inserting the countersunk screws 76 for fastening. In addition,
In this example, the intermediate frame plate 75 is fixed to the fixed frame 74 by three screws 76. The number of screws may be four as in the example shown in FIG. 5, or may be more. Generally, the smaller the number, the fewer the work steps of screw fastening.

Here, engaging projections 74b are formed at both left and right corners of the lower frame portion of the fixed frame plate 74, and the right and left corners of the lower frame portion of the intermediate frame plate 75 corresponding to these two engaging projections 74b are formed. An engagement hole 75b is formed at a corner. Therefore, the screw 76
When fixing by using the engaging projections 7 of the fixed frame plate 74,
4b with the engagement hole 75b of the intermediate frame plate 75,
If the intermediate frame plate 75 is pushed toward the fixed frame plate 74, the intermediate frame plate 75 can be temporarily fixed to the fixed frame plate 74. In this case, the positioning accuracy of the frame plates can be further improved.

The liquid crystal panel unit 70R of this embodiment also has a positioning means for positioning the panel frame plate 71 with respect to the intermediate frame plate 75 fixed to the fixed frame plate 74.
This positioning means has two wedges 77. The wedge guide surfaces 72e to 72g with which the inclined surface 77a of the wedge 77 abuts are
The first frame plate 72 of the panel frame plate 71 is formed at the center in the vertical direction on the left and right side surfaces of the peripheral wall 72a of the first frame plate 72. When the panel frame plate 71 is temporarily fixed to the intermediate frame plate 75, the first frame plate 7
2 and the intermediate frame plate 7 facing the wedge guide surface 72e.
A wedge insertion groove is formed between the frame and the frame portion 5. Therefore, after temporarily fixing the panel frame plate 71 to the intermediate frame plate 75,
The two wedges 77 are driven into the left and right sides of the first frame plate 72 and the pushing amount of these wedges 77 is adjusted.
OR positioning can be performed. In addition, since the process of configuring the prism unit 20 is the same as described above,
The description is omitted.

The liquid crystal panel unit 70R shown in FIG.
The same effect as in the case of can be obtained.

Further, in this embodiment, unlike the cases shown in FIGS. 5 and 6, the fixed frame plate 74 and the intermediate frame plate 75 have flat shapes. As described with reference to FIG. 2B, the fan 1 is located below the prism composite 22.
5B are arranged, and the cooling air flows upward from below.
In order to prevent the flow from being disturbed, it is desirable to arrange a rectifying plate above the fan 15B.
Since the fixed frame plate 74 and the intermediate frame plate 75 are flat, it is possible to extend the mounting position of the rectifying plate to just below the liquid crystal panel unit 70R. Can flow over. In addition, since the shape of these frame plates is simple, there is an advantage that component processing is easy and component accuracy is improved.

In addition, in the liquid crystal panel unit 70, two wedges 77 for positioning are used, and they are attached to the first frame plate 72 and the intermediate frame plate 75 at the vertical center positions on both left and right sides. Adhesive fixed. Wedge 7
If the adhesive fixing position of 7 is not appropriate, excessive stress concentration may occur in each member due to thermal deformation of the first frame plate 72, the intermediate frame plate 75, or the wedge 77. Further, for that purpose, the wedge 77 is moved to the first frame plate 72 or the intermediate frame plate 7.
5 may be peeled off. However, as described above, the wedge 77 is bonded and fixed to the left and right central positions, and the first frame plate 72 and the intermediate frame plate 7 are
5 is free to thermally deform in the vertical direction. Therefore, since the degree of restraint of the thermal deformation of these frame plates is low, adverse effects such as undesired concentration of stress and peeling of wedges can be avoided.

Further, as can be seen from FIG. 7, the wedge 77 of this embodiment has two blind holes 77c formed on the back surface 77b. These blind holes 77c function as chucking engagement portions when the wedge 77 is chucked and handled using a jig. Such a blind hole 77
If you form c, you can easily chuck it,
Therefore, the handling operation is simplified.

In this embodiment, a blind hole 77c for engagement during chucking is formed on the back surface of the wedge 77. The engaging portion for chucking may be formed on another member. For example, a chucking engagement portion such as a blind hole may be formed on the outer surface of the peripheral wall 72b of the panel frame plate 71.

(Another Embodiment of Liquid Crystal Panel Unit)
FIG. 8 shows another embodiment of the liquid crystal panel unit. The liquid crystal panel unit 60R shown in this figure also includes a panel frame plate 61 holding the liquid crystal panel 40R, and a fixed frame plate 64 adhered and fixed to the surface 22R of the prism composite 22. However, the intermediate frame plate 5
No parts corresponding to 5 and 75 are provided, and the panel frame 61 is directly screwed to the fixed frame plate 64 side.

More specifically, the configuration of the panel frame plate 61 is the same as the configuration of the panel frame plate 51 of FIG. 5 described above, and includes a first frame plate 62 and a second frame plate 63. The liquid crystal panel 40R is held in a state sandwiched therebetween. In order to hold the first and second frame plates 62 and 63 in the engaged state, the engaging hook 63c and the engaging claw 6
2c is formed. In addition, these first and second
Rectangular openings 62a, 63 for light passage
a is formed.

On the other hand, the fixed frame plate 64 is provided around the four sides of the rectangular frame portion with a hook, that is, a peripheral wall 64 having a fixed width.
e is formed. The panel frame plate 61 can be fitted inside the peripheral wall 64e. Further, screw holes 64f are formed at the four inner corners of the peripheral wall 64e. Screw holes 62f are also formed at the four corners of the first frame plate 62 of the panel frame plate 61 corresponding to these screw holes 64f. By screwing the screws 66 into these, the panel frame plate 61 is screwed and fixed to the fixed frame plate 64 side.

On the other hand, on the peripheral wall 64e of the fixed frame plate 64,
64 g of wedge guide surfaces are formed at two places on the upper and lower sides of one side surface. On the other side surface, a wedge guide surface 64g is formed at a central position in the vertical direction.

The liquid crystal panel unit 60R having this structure is
It is constituted by screwing the panel frame plate 61 to the fixed frame plate 64 with screws 66. After a while
The position is determined with respect to the surface 22R of the prism composite 22.
In this state, 64 g of wedge guide surfaces formed with three wedges 67
And the positioning is maintained such that the gap becomes zero by the surface tension of the ultraviolet-curing adhesive already applied to the joining surface of the wedge. After the positioning of the wedge 67 is performed in this way, ultraviolet rays are irradiated from the exposed end surface of the wedge 67 to cure the adhesive and bond it.

The wedge 67 is attached to the peripheral wall 6 of the fixed frame plate 61.
A structure may be provided in which each one is disposed at a central position on both sides of 4e. When the size of the fixed frame plate 64 is increased, the influence of expansion and contraction due to a temperature change can be minimized, which contributes to improvement in reliability.

Also in the liquid crystal panel unit 60R having this configuration, the liquid crystal panel 40R is covered and protected by the panel frame plate 61. The panel frame plate 61 holding the liquid crystal panel 40R is screwed to the fixed frame plate 64. Therefore, the liquid crystal panel 40R is in a protected state, and no external light enters. Further, when the liquid crystal panel is replaced, it is only necessary to remove the screw, so that the operation can be performed by a simple operation. Further, the surface of the prism composite is not damaged during the replacement work.

The liquid crystal panel unit 60R of this embodiment
Is composed of the panel frame plate 61 and the fixed frame plate 64, so that the overall weight can be reduced and the thickness can be reduced. In particular, when the liquid crystal panels 60R, G, and B are further reduced in size, and when a thick liquid crystal panel unit is attached to three surfaces, both liquid crystal panel units interfere at corners, and the prism composite body 22 is removed. In some cases, the size of the optical system including the prism composite body 22 can be reduced. However, in this example, a small and thin liquid crystal panel unit 60 can be configured.

Further, the fixed frame plate 64 and the first frame plate 6
2 can be made of a resin material, the weight can be reduced, the adhesive strength between the prism support plate 33 and the prism unit 20 can be increased, and a product having impact resistance can be realized.

Further, the liquid crystal panel unit 6 of this embodiment
In the case of 0R, when the liquid crystal panel 40R is replaced, only the panel frame plate 61 needs to be removed and replaced, so that the work is simple. In particular, when attaching a new panel frame plate 61, if this panel frame plate 61 is directly attached to the fixed frame plate 64, the focus position is determined. If each component is manufactured so that the error of the focus position at the time of mounting becomes an error within the allowable depth of focus, the focus adjusting operation is not required at the time of mounting the panel frame plate, so that the mounting operation is simplified.

After the replacement, the first screw is used without using the screw 66.
A method of bonding and fixing several places of the outer shape of the frame plate 62 to the fixed frame plate 64 may be used.

On the other hand, as shown in FIG.
62g blind holes at two diagonal positions of the four corners
It is conceivable that the first fixed frame plate 62 is chucked by the adjusting device using this to position the first fixed frame plate 62 with respect to the surface of the prism composite 22. As described above, the chucking by the adjusting device may be released after the adhesive for bonding and fixing the first frame plate 62 is completely cured. The provision of such a blind hole for chucking simplifies the positioning operation.

The chucking blind hole 62g is provided with the first blind hole 62g.
The outer peripheral portion of the frame plate 62 may be provided in a notch shape, and an engaging portion may be formed as a chucking portion on an outer portion of a portion that does not interfere with the side wall 64e of the fixed frame plate 64.

[0095]

As described above, in the projection type display device of the present invention, the light valve can be securely positioned and fixed to the light synthesizing means, so that the deviation amount of the pixel alignment can be suppressed and the focus adjustment can be accurately performed. Higher definition can be easily achieved. In addition, since the light-synthesizing means can be downsized while having a structure in which the light valve can be exchanged, it contributes to downsizing and weight reduction of the product, and also makes it possible to commercialize the product with high resistance to disturbance and high reliability. By arranging the mounting portion between the panel and the intermediate frame plate or the fixed frame plate on the vertical wall, a ventilation portion for cooling air is provided, and cooling performance can be secured.

In addition, on the manufacturing side, the panel arranged on the light incident surface of the light synthesizing means is held with its periphery protected by a panel frame plate. Further, the panel frame plate holding the panel is detachably attached to a fixed frame plate adhesively fixed to the light incident surface of the light synthesizing means.

Therefore, according to the present invention, since the periphery of the panel is covered and protected by the panel frame plate, there is no possibility that the panel may be damaged when the panel is handled. Further, there is no possibility that external light enters from the surroundings and malfunctions occur in the panel.

Further, when a failure occurs in the panel, only the panel can be replaced without damaging the surface of the photosynthesis means, which is economical. Furthermore, the panel replacement operation can be performed simply and accurately by the same manufacturing apparatus.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a projection display device to which the present invention is applied.

2A and 2B are diagrams showing the arrangement of each component inside the apparatus of FIG. 1, wherein FIG. 2A is a diagram showing a planar arrangement thereof, and FIG. 2B is a diagram showing a three-dimensional arrangement thereof.

FIG. 3A is a diagram illustrating a part of an optical lens unit and a projection lens unit taken out, and FIG. 3B is a schematic configuration diagram of an optical system.

FIG. 4 is a partial perspective view showing a head plate and a portion of a prism unit and a liquid crystal panel unit supported by the head plate.

FIG. 5 is an exploded perspective view showing the configuration of the liquid crystal panel unit of FIG.

FIG. 6 is an exploded perspective view showing a first modification of the liquid crystal panel unit of FIG.

FIG. 7 is an exploded perspective view showing a second modification of the liquid crystal panel unit of FIG.

FIG. 8 is an exploded perspective view showing another embodiment of the liquid crystal panel unit.

FIG. 9 is a perspective view showing a modification of the first fixed frame plate of FIG. 8;

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Projection display apparatus 1a Optical axis 2 Outer case 3 Upper case 4 Lower case 5 Front case 6 Projection lens unit 7 Power supply unit 8 Light source lamp unit 9 Optical unit 20 Prism unit 21 Prism 22 Prism composite bodies 22R, 22G, 22B Light incidence Surface 30 Head plates 40, 40R, 40G, 40B Liquid crystal panels 50R, 50G, 50B, 60R, 70R Liquid crystal panel units 51, 61, 71 Panel frames 52, 62, 72 First frame plates 52b, 64e, 72b Peripheral wall 53, 63, 73 Second frame plates 54, 64, 74 Fixed frame plates 55, 75 Intermediate frame plates 54c, 54e, 74c Screw holes 55c, 55e, 75c Screw holes 56, 66, 76 Screws 55d, 75d Piece 52d engaging hole 53c engaging protrusion 52c, 72c engaging groove 52e, 64g, 7 e, 72f, 72g wedge guide surfaces 57,67,77 wedge

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Masashi Kitabayashi 3-3-5 Yamato, Suwa-shi, Nagano Seiko Epson Corporation (56) References JP-A-1-158480 (JP, A) (58) Field surveyed (Int.Cl. ⁷ , DB name) G03B 21/00 G02F 1/13 505 G02F 1/1333 G03B 21/16

Claims (11)

(57) [Claims] 1. A light beam from a light source is decomposed into light beams of a plurality of colors, each color light beam is modulated through a panel in accordance with image information, and the modulated light beam of each color is re-synthesized by a light synthesizing means and projected. A projection-type display device for enlarging and projecting through a unit, wherein the panel mounting mechanism comprises: a fixed frame plate fixed to a light incident surface of the light combining unit; a first frame plate sandwiching the panel; and a second frame plate. A panel frame plate comprising: a frame plate; an intermediate frame plate disposed between the panel frame plate and the fixed frame plate; and a fixing device for detachably fixing the intermediate frame plate to the fixed frame plate. and means, the panel frame plate via the wedge are bonded and fixed to the intermediate frame plate, the gap formed on the intermediate frame plates and the panel frame plate
The wedges of the first frame plate allow cooling air to pass through.
A projection display device provided on left and right portions of a peripheral wall . 2. The projection display device according to claim 1, wherein a projection frame is formed on the fixed frame plate and the intermediate frame plate. 3. The method according to claim 2, The panel is held while riding on the projecting frame
A projection display device. 4. The projection display device according to claim 1, wherein the fixed frame plate and the intermediate frame plate have a flat shape. 5. The method according to claim 1 , wherein the light combining means is a prism composite, and
Left and right are short sides of the panel, and the prism composite
A projection display device, wherein a fan is arranged below the body . 6. The projection display device according to claim 5, wherein a rectifying plate is disposed between the light combining means and the fan. 7. The intermediate frame plate and the fixed frame plate according to claim 1, further comprising temporary fixing means for temporarily fixing the intermediate frame plate and the fixed frame plate. A projection type display device, wherein an engagement projection formed on one side is engaged with an engagement hole formed on the other side. 8. The projection display according to claim 1, further comprising a temporary fixing means for temporarily fixing the intermediate frame plate and the panel frame plate. 9. The temporary fixing device according to claim 8, wherein the temporary fixing means engages an engaging protrusion formed on one of the intermediate frame plate and the panel frame plate with an engaging hole formed on the other. Projection type display device. 10. The projection display device according to claim 8, wherein an engagement portion between the engagement protrusion and the engagement hole is fixed by bonding. 11. The method according to claim 1, wherein The first frame plate and the wedge are resin molded products.
The wedge is made of a material that transmits ultraviolet light.
Projection type display device.