JP5002726B2 - Projection type image display device - Google Patents

Description

  The present invention relates to a projection type image display device, and more particularly to a projection type image display device in which a liquid crystal display element and a prism element are fixed by an adhesive fixing member having an adhesive surface and an engaging portion.

Conventionally, various methods have been devised as a method of holding a liquid crystal panel of a liquid crystal projector.
In particular, in a liquid crystal projector using three liquid crystal panels, there is a problem that the image quality on the screen deteriorates when the relative positions of the liquid crystal panels change. Therefore, it is necessary to fix them by using a fixing method in which the relative positions are not shifted from each other.
Conventionally, a method using an adhesive is known as one of such fixing methods. For example, Patent Document 1 proposes a projection type image display apparatus that uses a plurality of wedges (spacer members) to adjust and fix the position of the liquid crystal panel when the liquid crystal panel is fixed with an adhesive.
Specifically, as shown in FIG. 8, the liquid crystal panel unit 150R attached to the light incident surface 122R of the prism 122 is bonded to the panel plate 151 holding the liquid crystal panel 140R and the light incident surface 122R. The fixed frame plate 154 is disposed.
The panel plate 151 is screwed to the fixed frame plate 154 side through the intermediate frame plate 155.
When the panel plate 151 is bonded and fixed with an adhesive, the position of the panel plate 151 is adjusted with respect to the light incident surface 122R by using a plurality of wedges (spacer members) 157 and bonded and fixed. ing.
Japanese Patent Laid-Open No. 10-10994

However, in the method described in Patent Document 1 of the conventional example, it is difficult to hold and fix the spacer member at the bonding site when bonding the spacer member.
As described above, when bonding is performed in a state where the spacer member is held and not fixed to the bonding portion, the adhesive layer is difficult to be constant, and it is difficult to stabilize the bonding strength. In addition, in order to adjust the position of the liquid crystal panel and completely fix it, a plurality of spacer members are required for each liquid crystal panel. In such a configuration, each spacer is pressed against the bonding site. However, it is necessary to bond them, and man-hours for that are required.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object thereof is to provide a projection type image display apparatus that can reduce the man-hours and suppress and hold a pixel shift when bonding and fixing an image forming element. It is what.

A plurality of image display elements that respectively modulate a plurality of color lights, and a prism element that combines the plurality of color lights modulated by the plurality of image display elements, and projecting the combined plurality of color lights to produce a color image A projection-type image display device for displaying
A first holding member for holding the image display element;
A second holding member for holding the prism element;
An adhesive surface that adheres to the first holding member; an adhesive surface that adheres to the second holding member; and an engaging portion that engages with at least one of the first holding member and the second holding member. an adhesive fixing member, was closed,
At least one of an adhesive surface that adheres to the first holding member, an adhesive surface that adheres to the second holding member, and the engaging portion attach at least one of the first holding member and the second holding member. It is characterized by holding in a pressed state .
Also, a projection type image display device of the present invention includes a plurality of the adhesive fixing member, bonded member of the plurality is characterized in that it is connected by a connecting member.
In the projection type image display device of the present invention, the connecting member can be elastically deformed.
In the projection type image display device of the present invention, the connecting member has an elastic hinge structure.
In the projection type image display apparatus of the present invention, at least one of the first holding member and the second holding member is supported by pressing both ends of the plurality of adhesive fixing members connected by the connecting member. It has the support part to do.
In the projection type image display apparatus of the present invention, the adhesive fixing member is formed of a transparent acrylic resin.
In the projection type image display apparatus of the present invention, the image forming element is a reflective liquid crystal display element.
In the projection type image display apparatus of the present invention, the image forming element is a transmissive liquid crystal display element.

  According to the present invention, it is possible to realize a projection-type image display apparatus that can reduce the man-hours for fixing and fixing the image forming element, and can suppress and hold the pixel shift.

Next, an embodiment of the present invention will be described.
In the present embodiment, an adhesive having an adhesive surface that adheres to a first holding member that holds an image display element and a second holding member that holds a prism element, and an engaging portion that engages with these holding members. The fixing member is configured as follows.
In the following description, the plurality of adhesive fixing members are referred to as spacer members.
That is, the engagement portion in the adhesive fixing member is formed in a hook shape. Thereby, a spacer member can be always pressed against an adhesion part and the state at the time of adhesion can be stabilized.
Furthermore, by conventionally connecting the spacer members, which have been divided into a plurality of parts, with an elastic member, the man-hours that have been attached and bonded one by one can be attached and bonded at a time.
According to such a configuration of the present embodiment, the number of parts is small, and the spacer can be reliably attached to, for example, the back plate and the support plate of the liquid crystal panel without variation.
Thereby, in the holding | maintenance of a liquid crystal panel, since the pixel shift | offset | difference of liquid crystal panels can be suppressed more, the projection type image display apparatus with improved image quality is realizable.

Examples of the present invention will be described below.
[Example 1]
FIG. 1 shows a projection type image display device (projection display device) of the present invention.
In FIG. 1, 1 is a light source lamp, 2 is a lamp holder for holding the lamp 1, 3 is explosion-proof glass, and 4 is a glass retainer.
α is an illumination optical system for entering the light from the lamp 1, and β is a color separation / synthesis optical system including a liquid crystal panel for three colors of RGB for entering the light emitted from the illumination optical system.
Reference numeral 5 denotes a projection lens barrel for projecting an image onto a screen (projected surface) (not shown) by receiving light emitted from the color separation / synthesis optical system. The projection lens barrel 5 has a projection lens optical system to be described later. Is housed.
Reference numeral 6 denotes an optical box that houses the lamp 1, the illumination optical system α, and the color separation / synthesis optical system β and to which the projection lens barrel 5 is fixed. The optical box 6 is a lamp peripheral member surrounding the lamp 1. A lamp case member 6a (not shown) is formed.

7 is an optical box lid that covers the optical box 6 with the illumination optical system α and the color separation / synthesis optical system β housed therein, 8 is a power source, 9 is a power filter, 10 is combined with a power source of 8, and the lamp 1 is combined. This is a ballast power source for lighting.
Reference numeral 11 denotes a circuit board for driving the liquid crystal panel and sending a lighting command for the lamp 1 by power from the power supply 8.
12A and 12B are cooling fans A and B for the optical system for cooling the optical elements such as the liquid crystal panel in the color separation / synthesis optical system β by sucking air from an air inlet 21a of the exterior cabinet 21 described later. is there.
Reference numeral 13 denotes an RGB duct A for sending the wind from the optical cooling fan 12 to an optical element such as a liquid crystal panel in the color separation / synthesis optical system β.

Reference numeral 14 denotes a cooling fan for a light source lamp for sending blowing air to the lamp 1 and cooling the lamp 1, and 15 is a lamp duct A for sending cooling air to the lamp while holding the lamp cooling fan 14. is there.
Reference numeral 16 denotes a lamp duct B for holding the cooling fan 14 and constructing a duct together with the 15 lamp ducts A.
Reference numeral 17 denotes a cooling fan for a power supply for simultaneously cooling the power supply 8 and the ballast power supply 10 by sucking air from an air inlet 21b provided in an exterior cabinet 21 to be described later to circulate wind through the power supply 8 and the ballast power supply 10. It is.
Reference numeral 18 denotes an exhaust fan. The exhaust fan 18 discharges hot air after passing through the lamp 1 by the lamp cooling fan 14.

Reference numeral 19 denotes a lamp exhaust louver A, and 20 a lamp exhaust louver B, which has a light shielding function so that light from the lamp 1 does not leak outside the apparatus.
21 is an exterior cabinet for housing the optical box 6 and the like (lower part of the exterior case), 22 is an exterior cabinet lid for covering the exterior cabinet 21 with the optical box 6 and the like being stored (upper part of the exterior case), and 23 is Side plates A and 24 are side plates B. The exterior cabinet 21 has the above-described intake ports 21a and 21b, and the side plate B24 has the above-described exhaust port 24a.
Reference numeral 25 denotes an interface board on which connectors for receiving various signals are mounted, and 26 denotes an interface reinforcing plate attached to the inside of the side plate A23.
Reference numeral 27 denotes a lamp exhaust box for guiding exhaust heat from the lamp 1 to the 18 exhaust fans and preventing the exhaust air from being dissipated inside the apparatus, and holds 19 lamp exhaust louvers A and 20 lamp exhaust louvers B.

Reference numeral 28 denotes a lamp lid. The lamp lid 28 is detachably provided on the bottom surface of the exterior cabinet 21 and is fixed by screws (not shown).
Reference numeral 29 denotes a set adjustment leg, and the set adjustment leg 29 is fixed to the exterior cabinet 21 so that the height of the leg portion 29a can be adjusted.
The tilt angle of the apparatus main body can be adjusted by adjusting the height of the leg 29a.
Reference numeral 30 denotes an RGB intake plate that holds a filter (not shown) attached to the outside of the intake port 21a of the exterior cabinet 21.
Reference numeral 31 denotes a prism base that holds a β color separation / synthesis optical system.
Reference numeral 32 denotes a box side having a duct-shaped portion for guiding cooling air from the cooling fans A and 12B of 12A and 12B to cool the optical element and the reflective liquid crystal display element of β color separation / synthesis optical system. It is a cover.
Reference numeral 33 denotes an RGB duct B for forming a duct by being combined with 32 box side covers.
Reference numeral 34 denotes an RGB substrate connected to the 11 circuit board connected to the FPC extending from the reflective liquid crystal display element, which is disposed in the β color separation / synthesis optical system, and 35 denotes the 34 RGB substrate. This is an RGB substrate cover for preventing electrical noise from entering.

Next, a projection mounted with a reflective liquid crystal display element (an image forming element such as a reflective liquid crystal panel) constituted by the lamp 1, the illumination optical system α, the color separation / synthesis optical system β, and the projection lens barrel 5 described above. The optical configuration of the type image display apparatus will be described with reference to FIG.
In FIG. 2, reference numeral 41 denotes an arc tube that emits white light with a continuous spectrum, and reference numeral 42 denotes a reflector that collects light from the arc tube 41 in a predetermined direction, and the arc tube 41 and the reflector 42 form the lamp 1.
Reference numeral 43a denotes a first cylinder array formed of a lens array having a refractive power in the horizontal direction (horizontal direction in the traveling direction of light from the lamp 1 (direction perpendicular to the paper surface)).
43b is a second cylinder array having a lens array corresponding to each lens of the first cylinder array 43a, 44 is an ultraviolet absorbing filter, and 45 is a polarization conversion element for aligning non-polarized light with predetermined polarized light.
46 is a front compressor composed of a cylindrical lens having a refractive power in the vertical direction, and 47 is a total reflection mirror for converting the optical axis by 88 degrees.
Reference numeral 43c denotes a third cylinder array formed of a lens array having a refractive power in the vertical direction (the vertical direction in the traveling direction of light from the lamp 1 (the vertical direction on the paper surface)).
43d is a fourth cylinder array having a lens array corresponding to each lens of the third cylinder array 43c, and 50 is a color filter for returning the color in a specific wavelength range to the lamp in order to adjust the color coordinate to a certain value. It is.
48 is a condenser lens, and 49 is a rear compressor composed of a cylindrical lens having refractive power in the vertical direction. The illumination optical system α is configured as described above.

58 is a dichroic mirror that reflects light in the blue (B) and red (R) wavelength regions and transmits light in the green (G) wavelength region, and 59 for G in which a polarizing element is attached to a transparent substrate. , Which transmits only P-polarized light.
Reference numeral 60 denotes a first polarization beam splitter that transmits P-polarized light and reflects S-polarized light, and has a polarization separation surface.
Reference numerals 61R, 61G, and 61B are a reflective liquid crystal display element for red, a reflective liquid crystal display element for green, and a reflective liquid crystal display element for blue that reflect incident light and modulate the image, respectively.
62R, 62G, and 62B are a quarter wavelength plate for red, a quarter wavelength plate for green, and a quarter wavelength plate for blue, respectively.
A trimming filter 64a returns orange light to the lamp in order to increase the color purity of R, and 64b is an incident-side polarizing plate for RB in which a polarizing element is attached to a transparent substrate, and transmits only P-polarized light.
65 is a color selective phase difference plate that converts the polarization direction of the R light by 90 degrees and does not convert the polarization direction of the B light. Reference numeral 66 denotes a second polarization beam splitter that transmits P-polarized light and reflects S-polarized light, and has a polarization separation surface.
68B is a B output side polarizing plate (polarizing element), which rectifies only the S polarized light of B, and 68G is a G output side polarizing plate that transmits only the S polarized light.
Reference numeral 69 denotes a dichroic prism that transmits RB light and reflects G light.
The above dichroic mirrors 58 to 69 constitute the color separation / synthesis optical system β.

Here, if the definitions of P-polarized light and S-polarized light are clarified, 45 polarization conversion elements convert P-polarized light into S-polarized light. Here, P-polarized light and S-polarized light are described with reference to 45 polarization conversion elements. Yes.
On the other hand, since the light incident on the dichroic mirror 58 is considered on the basis of the polarization beam splitters 60 and 66, it is assumed that P-polarized light is incident.
Although the light emitted from the 45 polarization conversion elements is S-polarized light, the same S-polarized light is defined as light that enters the dichroic mirror 58 as P-polarized light in this embodiment.

Next, the optical action of the projection type image display apparatus of this embodiment will be described.
Light emitted from the arc tube 41 is collected in a predetermined direction by the reflector 42.
The reflector 42 has a paraboloid shape, and light from the focal position of the paraboloid becomes a light beam parallel to the symmetry axis of the paraboloid.
However, since the light source from the arc tube 41 is not an ideal point light source but has a finite size, the condensed light flux contains many light components that are not parallel to the symmetry axis of the paraboloid. Yes.
These light beams are incident on the first cylinder array 43a.
The light beam incident on the first cylinder array 43a is divided into a plurality of light beams corresponding to the respective cylinder lenses and condensed (a plurality of belt-shaped light beams in the vertical direction).
Further, a plurality of light beams (a plurality of light beams in a strip shape in the vertical direction) are formed in the vicinity of the polarization conversion element 45 through the ultraviolet absorption filter 44 and the second cylinder array 43b.

The polarization conversion element 45 includes a polarization separation surface, a reflection surface, and a half-wave plate, and a plurality of light beams are incident on the polarization separation surface corresponding to the column, and are reflected by the transmitted P-polarized component light. The light is divided into polarized light components.
The reflected light of the S polarization component is reflected by the reflecting surface and is emitted in the same direction as the P polarization component.
On the other hand, the transmitted P-polarized light component is transmitted through the half-wave plate, converted into the same polarized light component as the S-polarized light component, and emitted as light having the same polarization direction.
A plurality of light beams that have undergone polarization conversion (a plurality of light beams in a strip shape in the vertical direction) are emitted from the polarization conversion element 45 and then reflected by the reflection mirror 47 through the front compressor 46 by 88 degrees.
Further, the light enters the third cylinder array 43c.
The light beam incident on the third cylinder array 43c is divided and condensed into a plurality of light beams corresponding to the respective cylinder lenses (a plurality of belt-shaped light beams in the horizontal direction).
After passing through the fourth cylinder array 43d, a plurality of light beams (a plurality of light beams in a strip shape in the horizontal direction) are formed and reach the condenser lens 48 and the rear compressor 49.

Here, due to the optical action of the front compressor 46, the condenser lens 48, and the rear compressor 49, a rectangular uniform illumination area is formed by overlapping the rectangular images of the plurality of light beams.
Reflective liquid crystal display elements 61R, 61G, and 61B, which will be described later, are arranged in this illumination area.
Next, the light converted to S-polarized light by the polarization conversion element 45 enters the dichroic mirror 58. The dichroic mirror 58 reflects B (430 to 495 nm) and R (590 to 650 nm) light and transmits G (505 to 580 nm) light.

Next, the G optical path will be described.
The G light transmitted through the dichroic mirror 58 enters the incident side polarizing plate 59.
The G light is still P-polarized light after being decomposed by the dichroic mirror 58 (S-polarized light in the case of 45 polarization conversion element standard).
The G light exits from the incident-side polarizing plate 59, then enters the first polarizing beam splitter 60 as P-polarized light, passes through the polarization separation surface, and enters the G reflective liquid crystal display element 61G. And so on.
In the reflective liquid crystal display element 61G for G, the G light is image-modulated and reflected.
The P-polarized component of the image-modulated G reflected light is transmitted again through the polarization separation surface of the first polarization beam splitter 60, returned to the light source side, and removed from the projection light.
On the other hand, the S-polarized component of the image-modulated G reflected light is reflected by the polarization separation surface of the first polarization beam splitter 60 and travels toward the dichroic prism 69 as projection light.
At this time, in a state in which all the polarization components are converted to P-polarized light (in a state where black is displayed), ¼ provided between the first polarizing beam splitter 60 and the reflective liquid crystal display element 61G for G. The slow axis of the wave plate 62G is adjusted in a predetermined direction.
Thereby, it is possible to suppress the influence of the disturbance of the polarization state generated in the first polarization beam splitter 60 and the G-type reflective liquid crystal display element 61G.
The G light emitted from the first polarizing beam splitter 60 enters the third polarizing beam splitter 69 as S-polarized light, reflects the G light on the dichroic film surface of the dichroic prism 69, and reaches the projection lens. .

On the other hand, the R and B lights reflected by the dichroic mirror 58 enter the incident side polarizing plate 64a. The R and B lights are still P-polarized light after being decomposed by the dichroic mirror 58.
Then, after the orange light is cut by the trimming filter 64a, the R and B lights are emitted from the incident-side polarizing plate 64b and are incident on the color selective phase difference plate 65.
The color-selective phase difference plate 65 has an action of rotating the polarization direction of only R light by 90 degrees, whereby the R light becomes S-polarized light and the B light becomes P-polarized light. Is incident on.
The R light incident on the second polarization beam splitter 66 as S-polarized light is reflected by the polarization separation surface of the second polarization beam splitter 66 and reaches the R reflective liquid crystal display element 61R.
The B light incident on the second polarization beam splitter 66 as P-polarized light passes through the polarization separation surface of the second polarization beam splitter 66 and reaches the B-use reflective liquid crystal display element 61B.

The R light incident on the R reflective liquid crystal display element 61R is image-modulated and reflected.
The S-polarized light component of the image-modulated R reflected light is reflected again by the polarization separation surface of the second polarization beam splitter 66, returned to the light source side, and removed from the projection light.
On the other hand, the P-polarized light component of the image-modulated R reflected light is transmitted through the polarization separation surface of the second polarization beam splitter 66 and directed to the dichroic prism 69 as projection light.
The B light incident on the B reflective liquid crystal display element 61B is image-modulated and reflected. The P-polarized component of the image-modulated B reflected light is again transmitted through the polarization separation surface of the second polarization beam splitter 66, returned to the light source side, and removed from the projection light.
On the other hand, the S-polarized component of the image-modulated B reflected light is reflected by the polarization separation surface of the second polarizing beam splitter 66 and travels to the dichroic prism 69 as projection light.

At this time, by adjusting the slow axes of the quarter-wave plates 62R and 62B provided between the second polarizing beam splitter 66 and the reflective liquid crystal display elements 61R and 61B for R and B, G As in the case of, the black display of R and B can be adjusted.
In this way, the B light of the R and B projection lights synthesized from one light beam and emitted from the second polarization beam splitter 66 is detected by the exit-side polarizing plate 68B and enters the 69 dichroic prism.
The R light passes through the polarizing plate 68B as it is with the P polarization, and enters the 69 dichroic prism.
Incidentally, the B projection light is generated by passing through the second polarizing beam splitter 66, the B-use reflective liquid crystal display element 61B, and the quarter-wave plate 62B by being analyzed by the exit-side polarizing plate 68B. The light is cut from invalid components.
The R and B projection light incident on the dichroic prism 69 passes through the dichroic film surface of the dichroic prism 69 and is combined with the G light reflected by the dichroic film surface to reach the projection lens 5. .
Then, the combined R, G, B projection light is enlarged and projected onto a projection surface such as a screen by the projection lens 5.

Since the optical path described above is for the case where the reflective liquid crystal display element displays white, the optical path when the reflective liquid crystal display element displays black will be described below.
First, the G optical path will be described.
The P-polarized light of the G light that has passed through the dichroic mirror 58 enters the incident-side polarizing plate 59, and then enters the first polarizing beam splitter 60 and is transmitted through the polarization separation surface. It reaches the element 61G.
However, since the reflective liquid crystal display element 61G displays black, the G light is reflected without being image-modulated.
Accordingly, since the G light remains P-polarized light after being reflected by the reflective liquid crystal display element 61G, it is transmitted again through the polarization separation surface of the first polarization beam splitter 60 and transmitted through the incident-side polarizing plate 59. Then, it is returned to the light source side and removed from the projection light.

Next, the R and B optical paths will be described.
P-polarized light of R and B light reflected from the dichroic mirror 58 is incident on the incident-side polarizing plate 64b. Then, the R and B lights are emitted from the incident side polarizing plate 64 b and then enter the color selective phase difference plate 65.
The color-selective phase difference plate 65 has an action of rotating the polarization direction of only R light by 90 degrees, whereby the R light becomes S-polarized light and the B light becomes P-polarized light. Is incident on.
The R light incident on the second polarization beam splitter 66 as S-polarized light is reflected by the polarization separation surface of the second polarization beam splitter 66 and reaches the R reflective liquid crystal display element 61R.
The B light incident on the second polarization beam splitter 66 as P-polarized light passes through the polarization separation surface of the second polarization beam splitter 66 and reaches the B-use reflective liquid crystal display element 61B.
Here, since the R reflective liquid crystal display element 61R displays black, the R light incident on the R reflective liquid crystal display element 61R is reflected without being image-modulated.
Therefore, even after being reflected by the reflective liquid crystal display element 61R for R, the R light remains as S-polarized light, and is reflected again by the polarization separation surface of the first polarization beam splitter 60, and is incident side polarized light. Since the light passes through the plate 64b and is returned to the light source side and is removed from the projection light, a black display is obtained.
On the other hand, the B light incident on the B reflective liquid crystal display element 61B is reflected without being image-modulated because the B reflective liquid crystal display element 61B displays black.
Therefore, even after being reflected by the reflective liquid crystal display element 61B for B, the B light remains as P-polarized light, and thus passes through the polarization separation surface of the first polarization beam splitter 60 again.
The light is converted into P-polarized light by the color-selective retardation plate 65, passes through the incident-side polarizing plate 64b, returns to the light source side, and is removed from the projection light.
The above is the optical configuration in the projection type image display apparatus using the reflective liquid crystal display element (reflective liquid crystal panel).

Next, a method for bonding and fixing the liquid crystal display element in this embodiment will be described.
As shown in FIG. 3, the reflective liquid crystal display element 70 is attached to the back plate 71.
The back plate 71 serves as a package for protecting the liquid crystal element and serves as a heat radiating plate for radiating heat generated in the liquid crystal element.
On the other hand, a panel support plate 72 is attached to the prism element (polarization beam splitter) 73.
The front end portion of the panel support plate 72 has a pin shape 72a, while the back plate 71 has a hole shape 71a.
Further, the panel support plate 72 is provided with a spacer bonding portion 72b, and the back plate 71 is also provided with a spacer bonding portion 71b.

Next, a procedure for bonding the reflective liquid crystal display element 70 to the panel support plate 72 via the back plate 71 will be described below.
First, the hole shape 71a is filled with a UV adhesive.
Next, the pin shape 72a is inserted into the hole shape 71a by moving the liquid crystal panel to the focus position.
The hole shape 71a has a size with an allowance for adjustment with respect to the diameter of the pin shape 72a.
After adjusting the relative position of the reflective liquid crystal display element 70 for each color light, the UV adhesive filled in the hole shape 71a is irradiated with UV light to perform adhesion fixation.
The above is UV temporary fixation of a liquid crystal display element.
Here, the adhesive injected into the hole shape 71a is selected to exhibit a characteristic that the curing shrinkage at the time of bonding is small in order to reduce the deviation due to the curing shrinkage at the time of bonding.

After the UV bonding and fixing as described above, the spacer 74 is bonded to the back plate and the panel support plate to further satisfy the mechanical strength.
The spacer 74 is formed of a transparent acrylic resin in this embodiment.
The spacer 74 has an adhesive surface 74a and an adhesive surface 74b as two adhesive surfaces. The bonding surface 74a is bonded to the back plate bonding surface 71b, and the bonding surface 74b is bonded and bonded to the support plate bonding surface 72b.
At that time, since the two surfaces are bonded to each other, it is necessary to bond them in a state of being pressed and adhered to both surfaces.
If any one of the surfaces is attached in a state of being lifted from the adhesive surface, the adhesive strength cannot be maintained sufficiently, and the reflection type of each color light is reflected by the temperature rise of the reflective liquid crystal display element 70 or the like. The relative positional relationship between the liquid crystal display elements 70 is shifted.
As a result, an image in which pixels on the screen are shifted becomes a cause of deterioration in image quality.

For this reason, in this embodiment, the spacer 74 is attached to the spacer 74 as follows so that both surfaces of the back plate 71 and the support plate 72 can be easily and stably adhered to the spacer 74. An engaging portion is configured.
That is, hook-shaped engaging portions 74 c and 74 d that can be positioned and fixed to the back plate 71 and the panel support plate 72 are formed on the spacer 74.
At the time of fixing, the plurality of engaging portions 74c and 74d provided on the spacer 74 are engaged with the back plate 71 and the support plate 72, respectively, but the inside dimension 74d of the engaging portion is the thickness 71c of the back plate 71. The value is slightly smaller than that.
The inner dimension of the engaging portion 74e is also slightly smaller than the thickness 72b of the support plate.
Thus, when the engaging portion is engaged with the back plate 71 and the support plate 72, the engaging portion is slightly pressed by the elasticity of the spacer 74, and the adhesion surface of the spacer 74 is in close contact with the back plate 71 and the support plate 72. Can be made.
Thus, the gap 74d of the engaging portion, the thickness of the back plate 71c, and the support plate 72 are managed and always pressed.
According to the above configuration, when the spacer 74 is affixed, the operator does not need to adhere the spacer 74 while pressing the spacer 74 with tweezers or the like, and the strength of pressing the spacer 74 against the adhesive surface is constant. The variation of can be reduced. FIG. 4 shows a state after the liquid crystal display element is bonded and fixed in this embodiment.
The engaging portions 74 c and 74 d are fitted in a state in which they are pressed against the back plate 71 and the panel support plate 72.

[Example 2]
As described in the first embodiment, a plurality of (for example, four) spacers 74 for one liquid crystal panel are attached to the back plate 71 and the support plate 72 one by one to perform UV bonding. It is necessary to perform the gluing operation.
For this reason, in this embodiment, a plurality of spacers 74 are attached to the liquid crystal panel at the same time and are bonded at the same time to reduce the bonding process.

In FIG. 5, the structural example of the connection spacer of a present Example is shown.
As shown in FIG. 5, a plurality of spacers 74 are connected by a connecting member 75a having a cross section smaller than that of the spacers, thereby forming a connecting spacer 75.
As a result, the four bonding steps required in the first embodiment can be reduced, and mass production efficiency can be improved.
Further, the connecting member 75a may have an elastic spring structure that can press the connecting spacer 75 against either the back plate 71 or the support plate 72.
At this time, a U-shaped shape 75b is provided at the center of the connecting member 75a as an elastic spring structure.
Further, at least one of the plurality of positioning and fixing means may be configured to have an engagement structure as shown in the first embodiment.
Further, the interval 77 between the bonding surfaces of the connecting spacer 75 is set to be slightly wider than the interval 76 between the bonding surfaces of the panel support plate.
When the connecting spacer 75 is inserted, the two adhesive surfaces 78a are inserted so as to come into contact with the adhesive surface 78b of the panel support plate, respectively. It is compressed and inserted so as to follow the distance 76 between the bonding surfaces.
During compression, the U-shaped shape 75b serves as a spring by the elasticity of the acrylic resin that forms the connecting spacer 75, and presses the connecting acrylic spacer against the adhesive surface.
Accordingly, it is not necessary to perform UV bonding while artificially pressing the acrylic spacer with tweezers and the like, and the pressing force at the time of bonding can be made constant, so that variations in the thickness of the adhesive layer can be reduced.
In this embodiment, the spacer 74 is formed with an engaging portion that engages only with the back plate 71 of the back plate 71 and the panel support plate 72.
That is, in the first embodiment, hook-like engagement portions 74c and 74d that engage with the back plate 71 and the panel support plate 72 are formed on the spacer 74, whereas in this embodiment, as shown in FIG. In addition, only a hook-like engaging portion 77 a that engages with the back plate 71 is formed.

FIG. 6 shows a state after the liquid crystal display element is bonded and fixed in this embodiment.
The interval 78b of the connecting spacer 75 shown in FIG. 5 is pushed in the direction of 75c by the panel support sheet metal 72 as shown in FIG.
The plurality of spacers 74 are connected by the connecting member 75a having a cross section smaller than that of the spacer for the following reason.
If connected with a structure having a thick cross section, if the spacer 74 itself absorbs heat when the liquid crystal panel generates heat, the spacer 74 expands with the linear expansion coefficient of the acrylic resin forming the spacer 74. It is.
On the other hand, the linear expansion coefficient of the back plate 71 or the panel support plate 72 (insertion of the iron plate value) is smaller than the linear expansion coefficient of the acrylic resin (acrylic value insertion).
Therefore, the stress generated by the difference in deformation amount due to the difference in linear expansion coefficient affects the adhesive surface, which makes it easier for the adhesive surface to peel off, and causes the liquid crystal panel to move when the adhesive surface peels off. become.
That is, it is considered that the higher the rigidity of the spacer 74, the greater the influence on the bonding surface.
For this reason, the connecting member that connects the spacers 74 needs to have a structure that has a sufficiently smaller cross section than the cross section of the spacers 74 and does not affect the bonding surface of the spacers 74.

Next, a configuration example of a spacer having a different form from the connecting spacer 75 will be described.
FIG. 7A shows a configuration example in which the acrylic spacers shown in FIGS. 5 and 6 are connected by a connecting member 79 having further elasticity.
When the connecting member 79 is attached to the liquid crystal panel as shown in FIG. 7B, the connecting member 79 is pressed in the direction of 79a, and the bonding surface 78a of the spacer 74 can be pressed against the bonding surface 71b of the back plate.
As a result, the plurality of spacers 74 can be combined into one component, so that the number of components can be reduced and bonding can be performed at the same time, thereby reducing the number of steps.

  In each of the above embodiments, the reflective liquid crystal display device has been described. However, the present invention can be applied to a transmissive liquid crystal display device without any problem. Further, the present invention is not limited by the above embodiments.

1 is an exploded perspective view of a projection type image display device equipped with a reflective liquid crystal display element of the present invention. The optical block diagram of the projection type image display apparatus carrying the reflective liquid crystal display element of this invention. The figure explaining the adhesion fixing method of the liquid crystal display element in Example 1 of this invention. The figure which shows the mode after the adhesion fixation of the liquid crystal display element in Example 1 of this invention. The figure which shows the structural example of the connection spacer in Example 2 of this invention. The figure which shows the mode after the adhesion fixation of the liquid crystal display element in Example 2 of this invention. The figure which shows Example 2 of this invention. The figure explaining the structure of the projection type image display apparatus which adjusts the position of a panel board using the some wedge (spacer member) in patent document 1 of a prior art example, and adheres and fixes it.

1: Light source lamp 2: Lamp holder 3: Explosion-proof glass 4: Glass holder 5: Projection lens barrel 6: Optical box 7: Optical box lid 8: Power supply 9: Power supply filter 10: Ballast power supply 11: Circuit boards 12A and 12B: Optical cooling fan A ・ B
13: RGB duct A
14: Lamp cooling fan (blowing fan)
15: Lamp duct A
16: Lamp duct B
17: Cooling fan for power supply 18: Exhaust fan 19: Lamp exhaust louver A
20: Lamp exhaust louver B
21: Exterior cabinet 22: Exterior cabinet lid (exterior case)
23: Side plate A
24: Side plate B
25: Interface board 26: Interface reinforcing plate 27: Exhaust box 28: Lamp cover 29: Set adjustment leg 41: Lamp arc tube (light source)
42: Reflector 70: Reflective liquid crystal element 71: Back plate 71a: Back plate hole 71b: Back plate adhesive surface 72: Panel support plate 73: Prism element 74: Spacer 74a: Adhesive surface 74b on the back plate side of the spacer: Adhesion surface 74c on the panel support plate side of the spacer: hook-like engagement portion 74d: hook-like engagement portion 75: connection spacer 76: spacing between the adhesion surfaces of the panel support plate 77: between the adhesion surfaces of the connection acrylic spacers Interval 77a: Hook-shaped engagement portion 78a: Back side adhesive surface 78b of the connecting spacer: Panel support plate side adhesive surface 79 of the connecting spacer 79: Spacer connecting portion 79a: Pressing direction due to elasticity of the connecting portion of the connecting spacer

Claims (8)

A plurality of image display elements that respectively modulate a plurality of color lights, and a prism element that combines the plurality of color lights modulated by the plurality of image display elements, and projecting the combined plurality of color lights to produce a color image A projection-type image display device for displaying
A first holding member for holding the image display element;
A second holding member for holding the prism element;
An adhesive surface that adheres to the first holding member; an adhesive surface that adheres to the second holding member; and an engaging portion that engages with at least one of the first holding member and the second holding member. an adhesive fixing member, was closed,
At least one of an adhesive surface that adheres to the first holding member, an adhesive surface that adheres to the second holding member, and the engaging portion attach at least one of the first holding member and the second holding member. A projection-type image display device characterized by being held in a pressed state . The projection type image display device according to claim 1 , wherein a plurality of the adhesive fixing members are provided, and the plurality of adhesive fixing members are connected by a connecting member. The projection type image display device according to claim 2 , wherein the connecting member is elastically deformable. The connecting member is a projection type image display apparatus according to claim 2 or 3, characterized in that an elastic hinge structure. The at least one of the first holding member and the second holding member has a support portion that presses and supports both ends of the plurality of adhesive fixing members connected by the connecting member. 5. The projection type image display device according to any one of 2 to 4 . The adhesive fixing member, the projection type image display apparatus according to any one of claims 1 to 5, characterized in that it is formed of a transparent acrylic resin. The image forming element, the projection type image display device according to any one of claims 1 to 6, characterized in that a reflective liquid crystal display device. The image forming element, the projection type image display device according to any one of claims 1 to 6, characterized in that a transmission type liquid crystal display device.

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