JP2000259094A - Optical device and projection type display device using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize an optical device and a projection type display device using the same, and to make the attaching work of an electrooptical device to a prism easy, efficient, and accurate. SOLUTION: This optical device is equipped with a prism synthetic body 22, an electrooptical device holding body 51 holding an electrooptical device, and a fixed frame body 57 constituted to have a base part 57a on which the holding body 51 is fixed and a leg part 57b extended from the base part 57a and fixed on the synthetic body 22. The leg part 57b of the fixed frame body 57 on which the holding body 51 is fixed by a screw 56, etc., is fixed on the synthetic body 22 by soldering, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an optical device in which an electro-optical device such as a liquid crystal panel is attached to a prism such as a dichroic prism or a polarizing beam splitter, and a projection display device using the optical device. Things.

[0002]

2. Description of the Related Art An example of a conventional optical device in which an electro-optical device such as a liquid crystal panel is attached to a prism according to the present invention is disclosed in Japanese Patent Application Laid-Open No. 10-10994. Will be described based on the exploded configuration diagram of FIG.

[0003] A liquid crystal panel unit 70R is mounted on a light incident surface 72R of a prism composite 72 of a projection display device. The panel unit 70R includes an innermost fixed frame 76 bonded and fixed to the light incident surface 72R of the prism composite 72, an outermost panel frame 73 that stores and holds the liquid crystal panel 80R, and a fixed frame 76. Panel frame 73
And an intermediate frame 77 arranged in the middle of the frame.
The panel frame 73 has a first frame 74 and a second frame 75, and furthermore, the liquid crystal panel 80R is connected to these frames 74,7.
5 is held.

[0004] Engagement projections 77b projecting outward from the four corners of the intermediate frame 77 are fitted and bonded into engagement holes 74b formed at the four corners of the (first frame 74 of) the panel frame 73. At the same time, a substantially triangular prism shaped spacer 78 is interposed between the intermediate frame 77 and the panel
And the panel frame 73 are bonded and fixed. Hereinafter, steps for obtaining this configuration will be described with reference to a flowchart shown in FIG.

[0005] First, the fixing frame 76 is positioned on the light incident surface 72R of the prism composite 72 and is adhesively fixed with an adhesive (S1). Then, the intermediate frame 77 is positioned outside the fixed frame 76 to which the adhesive is fixed, and 4
The screws 79 are inserted into the screw holes 77a and 76a and fixed (S2).

Thereafter, an adhesive is loaded into an engagement hole 74b provided in the first frame 74 of the panel frame 73 in which the liquid crystal panel 80R is stored and held, and the intermediate frame is inserted into the engagement hole 74b. The panel frame 73 is mounted on the intermediate frame 77 by fitting the engagement projection 77b of the panel 77 (S).
3).

Next, in this state, the liquid crystal panel 80R is turned on (S4), and focus adjustment and alignment adjustment of the liquid crystal panel 80R are performed (S5, S6). Steps S4 to S6
Is performed to adjust the position of the liquid crystal panel 80R on the optical axis, the position of the liquid crystal panel 80R relative to the position, and the like.

Next, the adhesive loaded in the engaging hole 74b is cured, and the intermediate frame 77 and the panel frame 73 are temporarily fixed (S7). Thereafter, the amount of displacement of the pixel position of the liquid crystal panel 80R is checked (S8). As a result, if the displacement exceeds the allowable range (in the case of failure), the panel frame 73 is removed (S13), and the process returns to step S3.

On the other hand, if the displacement is within the allowable range (good), an adhesive is applied to the spacer 78 (S
9), this is temporarily fixed to the intermediate frame 77 and the panel frame 7
3 (S1).
0). Then, by hardening the adhesive between the spacer 78, the panel frame 73, and the intermediate frame 77, the panel frame 73 is permanently fixed to the prism composite 72 (S
11).

[0010]

However, in the case of the above-mentioned conventional device, fixing the liquid crystal panel unit to the prism requires an intermediate frame in addition to the fixed frame.
Screws for fixing the fixed frame and the intermediate frame, projections of the intermediate frame and the holes of the panel frame for temporarily fixing the panel frame and the intermediate frame, and the panel frame and the intermediate frame. This requires a spacer or the like for permanently fixing the device, which hinders miniaturization of the device. In addition, there is room for improvement in terms of work efficiency and positioning accuracy due to many fixing means and associated steps.

In view of the above, the present invention provides a fixing frame directly fixing a holder of an electro-optical device directly to a prism instead of a conventional fixing frame used for fixing an electro-optical device and a prism. It is intended to reduce the size of the optical device and the projection type display device using the optical device, and to simplify and efficiently mount the electro-optical device with respect to the prism by eliminating the need for spacers. is there.

[0012]

In order to achieve the above object, the present invention employs the following constitution.

According to a first aspect of the present invention, a prism, an electro-optical device holder holding an electro-optical device, a base for fixing the electro-optical device holder, and a leg extending from the base and fixed to the prism And a fixed frame body comprising: the leg portion of the fixed frame body to which the electro-optical device holding body is fixed,
An optical device fixed to the prism with a fixing material. According to this, only the fixed frame is disposed between the prism and the electro-optical device holder, and accordingly,
The downsizing of the device and the simplification of the assembly work can be achieved.

Further, a metal layer is formed at a position where the leg of the prism is fixed, and a metal is used as the fixing material. In particular, solder is used as a fixing material. According to these, the prism and the electro-optical device holder can be fixed in a short time and with stable quality, and diffusion of the fixing material to unnecessary portions can be prevented.

Further, a non-metallic adhesive is used as the fixing material. In particular, a base treatment for increasing the adhesive strength of the adhesive is applied to a position where the leg of the prism is fixed. According to this, there is an advantage that the fixing frame can be directly fixed to the prism without forming a metal layer on the prism.

Further, the leg portion has a fixing flat portion provided for fixing to the prism, and a connecting portion connecting the fixing flat portion and the pedestal portion. This is smaller than the plane area of the fixing plane portion. According to this, the deformation caused by the difference in the coefficient of thermal expansion between the fixed frame body and the prism can be suppressed by utilizing the elasticity of the connecting portion.
Pixel shift of the device can be prevented.

Further, an outer peripheral shape of a surface of the base facing the prism is larger than an outer peripheral shape of a surface of the prism facing the base. By doing so, the area of the image forming surface of the electro-optical device can be made relatively large even if the prism is made small, so that it is possible to suppress a decrease in the definition and brightness of an image even when the device is downsized.

Further, the legs are provided at a plurality of locations around the base. According to this, the fixing frame can be stably fixed to the prism side, and the impact resistance after the fixing is improved. Furthermore, if air is allowed to pass through the gap between the legs, the cooling performance of the device is improved, and the noise of the cooling fan and the like can be reduced.

According to a second aspect of the present invention, there is provided a prism, a prism fixing plate fixed to upper and lower surfaces of the prism, an electro-optical device holder for holding the electro-optical device, and a base for fixing the electro-optical device holder. And a fixed frame having legs extending from the base and fixed to the prism fixing plate,
An optical device in which a leg of the fixed frame body to which the electro-optical device holder is fixed is fixed to the prism fixing plate with a fixing material. In this case, only the fixing frame needs to be interposed between the prism and the electro-optical device holder,
Accordingly, downsizing of the apparatus and simplification of the assembling work can be achieved. In this case, since the prism surface is not directly used for fixing, it is possible to prevent the prism surface from being stained or damaged, and to use the prism fixing plate for fixing the prism unit.

Also, in the second invention, by adopting the same modifications as in the first invention,
The same operation and effect as described above can be obtained.

According to a third aspect of the present invention, there is provided a projection display device including any one of the above-described optical devices, the electro-optical device modulating the light, and a projection lens for projecting the modulated light. It is. This makes it possible to achieve the respective functions and effects obtained by the optical device described above also in the projection display device.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a preferred embodiment of the present invention will be described with reference to the accompanying drawings, taking a projection display device to which an optical device according to the present invention is applied as an example.

FIG. 1 is an external view of a projection display device to which the optical device according to 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
It comprises a lower case 4 and a front case 5 defining the front of the apparatus. And the front case 5
Projecting from the center of the projection lens unit 6 protrudes from the center of the projection lens unit 6.

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. Further, at the center of the front side of the optical unit 9, the base end side of the projection lens unit 6 is located.

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 the interface board 11, a video signal processing circuit is mounted. A substrate 12 is provided. Further, a control board 13 for controlling the drive of the apparatus is disposed above the light source lamp unit 8 and the optical unit 9, and speakers 14R and 14L are disposed at the left and right corners on the front end side of the apparatus.

Above and below the optical unit 9, intake fans 15A and 15B for cooling the inside of the apparatus are 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 the 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.

Of these fans, fan 15B is
It mainly functions as a cooling fan for the liquid crystal panels 40R, 40G, and 40B described later. Note that the fan 15A can be used for cooling the liquid crystal panels 40R, 40G, and 40B.

The configuration of the optical unit 9 and the optical system will be described below with reference to FIG.

FIG. 3A shows the optical unit 9. As shown in this figure, the optical unit 9
An optical element other than the prism unit 20 constituting the color synthesizing means is held between upper and lower light guides 901 and 902 by being sandwiched from above and below. The upper light guide 901 and the lower light guide 902 are fixed to the upper case 3 and the lower case 4 by fixing screws, respectively. These upper and lower light guides 901 and 902 are also fixed to the prism unit 20 side by fixing screws.

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.

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, a uniform illumination optical system 923 having integrator lenses 921 and 922, which are uniform illumination optical elements, and a light beam W emitted from the illumination optical system 923, and outputs the light beam W in red, green, and blue. And a liquid crystal panel 40R, 40G, and 40B as an electro-optical device that modulates each color light flux.
And a prism combining unit 22 as a color combining optical system that combines the modulated color light beams, and a projection lens unit 6 that enlarges and projects the combined light beams on a projection surface. In addition, it has a relay optical 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.

The uniform illumination optical system 923 further includes a reflection mirror 931 so that the optical axis 1a of the light emitted from the light source lamp 805 is bent at a right angle toward the front of the apparatus. With the mirror 931 interposed therebetween, the integrator lenses 921 and 922 are arranged to be 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 9.
42 and a reflection mirror 943. First, in the blue-green reflecting dichroic mirror 941, the blue light beam B and the green light beam G included in the light beam W that has passed through the uniform illumination optical system 923 are reflected at a right angle, and the light is reflected by the green reflecting dichroic mirror 942. Head for. 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 color combining optical system. Next, in the green reflection dichroic mirror 942, the green light flux G of the blue and green light fluxes B and G reflected by the mirror 941.
Only the light is reflected at a right angle, and is emitted from the emission part 945 of the green light beam to the color combining optical system side. 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 relay optical system 927. In this example, the distances from the light emitting portion of the uniform illumination optical element to the light emitting portions 944, 945, 946 of the respective color light beams in the color separation optical system 924 are all set to be substantially equal.

Condensing lenses 951 and 952 are disposed on the emission sides of the emission sections 944 and 945 of the red and green light beams of the color separation optical system 924, respectively. Therefore,
The red light beam and the green light beam emitted from each emission unit are incident on these condenser lenses 951 and 952 and are collimated.

The parallelized red and green light beams R and G
Are polarized by the polarizing plates 60R and 60G, and then incident on the liquid crystal panels 40R and 40G to be modulated.
Image information corresponding to each color light is added. That is, the switching of these liquid crystal panels 40R and 40G is controlled by an image signal corresponding to the image information by a driving unit (not shown), whereby each color light passing therethrough is modulated. As such a driving unit, a known unit can be used as it is.

On the other hand, the blue light beam B is transmitted to the relay optical system 927
Then, after the polarization directions are aligned by the polarizing plate 60B, the light is guided to the corresponding liquid crystal panel 40B, where the light is similarly modulated according to the image information. Incidentally, as the liquid crystal panels 40R, 40G, 40B of this example, for example, those using a polysilicon TFT as a switching element can be used.

The relay optical system 927 includes a condenser lens 974
, An input side reflection mirror 971 and an output side reflection mirror 972
And an intermediate lens 973 arranged between these mirrors,
Condensing lens 953 arranged on the front side of liquid crystal panel 40B
Consists of The length of the optical path 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, by interposing the relay optical system 927, the light amount loss can be suppressed.

Each color light flux modulated through each of the liquid crystal panels 40R, 40G, 40B is applied to a polarizing plate 61R, 61G, 6B.
1B, and is transmitted through the prism composite 22B.
And are synthesized here. In this example, a color combining optical system is configured using a prism combining body 22 composed of a dichroic prism. The synthesized color image is enlarged and projected on the projection surface 10 at a predetermined position via the projection lens unit 6.

Next, referring to FIG.
The structure of the head plate 30 will be described.

FIG. 4 shows the head plate 30 and the prism unit 20 and the liquid crystal panel units 50R, 50G and 50B attached to the head plate 30. Here, the liquid crystal panel unit 50 with respect to the prism unit 20 (or the prism composite 22) is used.
The attachment of R, 50G, and 50B is shown schematically (for details, see FIGS. 5, 8, and 9).

As shown in FIG. 4, the head plate 30 basically includes 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. ing. The vertical wall 31 has a rectangular opening 31b through which the light emitted from the prism unit 20 passes. Further, a large number of reinforcing ribs are formed on the vertical wall 31 to increase its rigidity. The prism unit 20 and the projection lens unit 6 are fixed with the vertical wall 31 interposed therebetween and aligned (see FIG. 3A). 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 installed on the upper surface of the bottom wall 32 of the head plate 30. Prism unit 2
Reference numeral 0 includes a prism composite 22 having a rectangular parallelepiped shape formed by joining four prisms 21 each having a cross section of a substantially right-angled isosceles triangle to each other, and a prism support plate 33. (See FIG. 5). 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. The liquid crystal panel units 50R, 50G, and 50B having the liquid crystal panels 40R, 40G, and 40B are respectively attached to three side surfaces of the side surfaces of the prism composite 22 that function as light incident surfaces.

Next, the configuration of the liquid crystal panel units 50R, 50G, and 50B that are attached to the prism unit 20 (or the prism composite 22) and that characterize the present embodiment will be described based on the exploded view of the liquid crystal panel unit in FIG. Will be described. The liquid crystal panel units 50R, 50R
Since G and 50B have the same configuration, the liquid crystal panel unit 50G will be described below as an example.

The liquid crystal panel unit 50G includes an electro-optical device holder 51 that houses and holds a liquid crystal panel 40G, which is an electro-optical device, and an electro-optical device holder 51.
Fixing frame 5 for attaching to the prism unit 20
The electro-optical device holder 51 is fixed to the fixing frame 57 by fixing means such as screws 56.

The electro-optical device holder 51 includes a first frame 52 disposed on the light source side (outside) and a prism composite 22.
A second frame 53 is provided on the side (inside), and a liquid crystal panel 40G is sandwiched between these frames. Further, in the electro-optical device holder 51, the outer peripheral shape of the surface facing the light incident surface 22G of the prism composite 22 is
It has a size (outer shape) that fits in the light incident surface 22G. A flexible cable 41G for wiring extends upward from the upper part.

The first frame 52 has a rectangular opening 52 in the inner area.
a is a basically rectangular frame provided with a peripheral wall 52b having a constant thickness. There is a space for accommodating the liquid crystal panel inside the peripheral wall 52b, and second and
An engagement groove 52h that engages with the frame 53 is
At four corners b, screw holes 52c through which screws 56 can pass are provided.

The second frame 53 is for holding the liquid crystal panel 40G accommodated in the first frame 52, and is a plate-shaped frame having a rectangular opening 53a formed in the inner area. Second
The left and right outer sides of the frame 53 are provided with engagement grooves 52h of the first frame 52.
And a hook 53h that engages with the hook.

The first frame 52 and the second frame 53 are connected to the engagement groove 52h and the hook 53 with the liquid crystal panel 40G interposed therebetween.
h and constitute an electro-optical device holder 51. In this case, the screw hole 52c of the first frame 52 is
The screws 56 are positioned outside the outer peripheries of the liquid crystal panel 40G and the second frame 53 so as not to hinder the screw 56 from reaching the fixed frame 57 through the screw hole 52c.

The structure of the electro-optical device holder 51 is not limited to the structure described above, but basically has a structure capable of holding the liquid crystal panel 40G and coupling with the fixed frame 57. Just do it.

The fixed frame 57 has a base 57a having an opening 57f at the center and legs 57b formed at four corners of the base 57a. The outer peripheral shape of the surface of the base portion 57a facing the prism composite 22 is
(The outer shape) that can be accommodated in the light incident surface 22G. Further, a screw hole 57c corresponding to the screw hole 52c of the electro-optical device holder 51 is formed in the base portion 57a.
The leg portion 57b includes a fixing flat portion 57d used for fixing to the prism unit 20, and a connecting portion 57e extending from the base portion 57a and supporting the fixing flat portion 57d. The fixed frame 57 is generally made of steel, and has legs 57b.
May be formed by bending a member integrated with the base 57a, or may be formed separately and attached to the base 57a.

Further, the cross-sectional area of the connecting portion 57e is considerably smaller than the plane area of the fixing flat portion 57d.
The elasticity of e is increased, so that the force applied to the fixed portion caused by the difference in the coefficient of thermal expansion between the fixed frame 57 and the prism composite 22 can be absorbed by the connecting portion 57e.
Further, when the connecting portion 57e is extended from the left and right ends of the base portion 57a and the upper and lower spaces of the fixed frame 57 are made as wide as possible, air from the fans 15A and 15B allows the fixed frame 57 and the prism composite 22 It becomes easier to cool the liquid crystal panel 40G because it is easy to pass through the gap vertically. Other shapes of the fixed frame body 57 in consideration of such conditions are illustrated in FIGS. 6A to 6C. However, it is needless to say that the present invention is not limited to these.

On the other hand, the metal layer 22a (the liquid crystal panel unit 50G) is provided at the corners (four corners in this case) of the corresponding surfaces of the prism composite body 22 to which the leg portions 57b of the fixed frame body 57 are fixed.
(Not visible on the prism surface corresponding to the above). This is for increasing the affinity with the metal as the fixing material when the fixing frame 57 and the prism composite 22 are to be fixed by welding with a metal such as solder. When a nonmetallic adhesive (for example, an ultraviolet curable adhesive) is used for the fixing material, a base treatment such as degreasing is performed on this portion to increase the adhesive force of the adhesive. However, here, description will be made assuming that solder is used as the fixing material.

Next, referring to the mounting flow of the liquid crystal panel unit shown in FIG.
A method of attaching R, 50G, and 50B to the prism composite 22 will be described.

First, the light incidence surface 22 of the prism composite 22
R, 22G, 22B, polarizing plates 61R, 61G, 61B
(Step S1 in FIG. 7). The liquid crystal panel 4
Each electro-optical device holder 51 having one of 0R, 40G, and 40B is fastened and fixed to the solid frame 57 with the screw 56 (step S2 in FIG. 7).

Next, the liquid crystal panel units 50R and 50R in which the electro-optical device holder 51 and the solid frame 57 are integrated.
G, 50B to the light incident surface 22R,
Move the focus closer to 22G, 22B,
The electro-optical device holder 5 is provided on the focus surface of the projection lens 6.
The focus planes of the liquid crystal panels 40R, 40G, and 40B sandwiched between the first and second liquid crystal panels 40R, 40G, and 40B are adjusted, and the alignment is adjusted to adjust the positions of the pixels of the liquid crystal panels 40R, 40G, and 40B (step S3 in FIG. 7).

The focus adjustment is performed by the projection lens unit 6.
Let the optical axis be the z-axis and the two axes orthogonal thereto be the x-axis and the y-axis, the position in the x-axis direction (x), the tilt in the rotation direction with respect to the x-axis (xθ), and the y-axis In this case, the adjustment in the three axial directions is performed in total. This adjustment is performed with reference to the vicinity of the liquid crystal layers of the liquid crystal panels 40R, 40G, and 40B.

The alignment is adjusted by setting the optical axis of the projection lens unit 6 to the z-axis and two axes orthogonal to the z-axis to the x-axis.
Assuming that the axes are the y-axis, the liquid crystal panels 40R, 40G, 40B
X-direction position (x), y-direction position (y), and z
The tilt in the rotation direction (zθ) with respect to the axis, that is, the adjustment in the three axis directions in total. The alignment adjustment is preferably performed with reference to any one of the three liquid crystal panels 40R, 40G, and 40B, but may be performed independently.

Next, the fixing flat portions 57d arranged at the four corners of the fixed frame 57 and the metal layer 22a of the prism composite 22 are solder-welded (step S4 in FIG. 7). Before performing the focus adjustment or the like, the solder is applied on the fixing flat portion 57 d of the fixed frame 57 or the metal layer 22 of the prism composite 22.
It is good to apply it on a in advance. This is the same when a nonmetallic adhesive is used.

Further, the liquid crystal panel units 50R, 50
The positions of G and 50B and the welding state between the fixed frame 57 and the prism composite 22 are checked (step S5 in FIG. 7), and the displacement of the liquid crystal panel units 50R, 50G and 50B exceeds the allowable range. If the welding condition is not good, the solder is melted to remove the liquid crystal panel unit from the prism composite 22 (step S6 in FIG. 7), and the steps from step S3 are repeated again. On the other hand, the liquid crystal panel unit 50
If the displacement of R, 50G, and 50B is within the allowable range and the welding state is good, the liquid crystal panel unit 50
The attachment of the R, 50G, and 50B to the prism composite 22 is completed.

Through the above steps, the prism composite 22
(Or prism unit 20) with liquid crystal panel unit 5
FIG. 8 shows a state where 0G is attached and fixed. The other liquid crystal panel units 50R and 50B are fixed to the prism composite 22 in the same state, but these are omitted here.

According to the above embodiment, the number of members to be attached to the prism composite 22 in the light incident direction is reduced, so that the device can be made smaller and the assembly work can be made more efficient. Further, the elasticity of the connecting portion 57e of the leg portion 57b can suppress the deformation caused by the difference in the coefficient of thermal expansion between the fixed frame 57 and the prism composite 22, thereby preventing pixel displacement. Also, the fixed frame 57 is placed at its four corners with the prism composite 2
The fixing frame 57 and the electro-optical device holding body 51 are stably fixed to the prism composite body 22 by being fixed to 2. Furthermore, since solder is used as the fixing material, the time required for hardening is shortened and the working time is shortened. Further, while stable fixation is achieved by solder welding, the fixation can be easily removed.

FIG. 9 shows another embodiment of the present invention.
FIG. 7 is a diagram showing an assembly of a prism composite and a liquid crystal panel unit corresponding to FIG. 9, the same components as those in FIG. 8 are denoted by the same reference numerals. Here, a prism fixing plate 58 made of ceramic or plastic is fixed to the upper and lower surfaces of the prism composite 22 with an adhesive or the like. The outer periphery of the fixed frame 57 used here is
It substantially corresponds to the outer periphery of the state where the prism composite body 22 and the prism fixing plate 58 are integrated. Each corner of the peripheral end surface of the prism fixing plate 58 is fixed in advance to the fixing frame 57.
A metal layer 58a corresponding to the fixing flat portion 57d is formed, and the metal frame 58a and the fixing flat portion 57d are solder-welded, so that the fixing frame 57 and the electro-optical device holder 51 are attached to the prism composite 22. It is attached. Note that the other components of this embodiment and the method of attaching the liquid crystal panel units 50R, 50G, 50B are the same as those of the above-described embodiment.
Here, the description is omitted. Further, also in this embodiment, without forming a metal layer on the prism fixing plate 58,
The prism fixing plate 58 and the fixing flat portion 57d of the fixing frame 57 may be bonded using a nonmetallic adhesive.

In the case of this embodiment, the prism composite 2
Although prism fixing plates 58 are added to the upper and lower surfaces of 2,
In the light incident direction, similarly to the above-described embodiment, the number of members attached to the prism composite 22 is reduced, so that the apparatus can be reduced in size and the efficiency of assembly work can be increased. Further, in addition to the effects of the above-described embodiment, since the prism composite 22 is not directly used for fixing to the fixing frame 57, it is possible to prevent the surface of the prism composite 22 from being stained or damaged. The prism fixing plate 58 can also be used as a support plate for the head plate 30.

As described above, the present invention has been described based on the specific embodiments. However, the present invention is not limited to the above embodiments, and various modifications and changes are possible. To the extent possible, these modifications and changes are also included in the present invention.

For example, the following changes are possible. (1) In the embodiment described above, the prism composite 22 of the electro-optical device holder 51 and the fixed frame 57 is used.
The outer peripheral shape of the surface facing the light incident surfaces 22R, 22G, and 22B is large enough to fit within the light incident surfaces 22R, 22G, and 22B (including the end surface of the prism fixing plate 58 when the prism fixing plate 58 is used). Had become. However, the outer peripheral shape may be larger than the light incident surfaces 22R, 22G, 22B. By doing so, the prism composite 2
2, the liquid crystal panels 40R, 40G, 40B
This is because the area of the image forming surface can be made relatively large, so that it is possible to reduce the reduction in image definition and brightness due to the downsizing of the apparatus.

(2) In the above embodiment, an example in which the present invention is applied to a projection display device using a transmissive liquid crystal panel has been described. However, the present invention relates to a projection using a reflective liquid crystal panel. It is also possible to apply to a type display device. Further, as described later, the electro-optical device is not limited to a liquid crystal panel. Here, “transmissive” means that an electro-optical device such as a liquid crystal panel transmits light, and “reflective” means that an electro-optical device such as a liquid crystal panel reflects light. It is a type. In a projection display device employing a reflection-type electro-optical device, a dichroic prism such as a prism composite 22 is used as light separating means for separating light into red, green, and blue light. It may also be used as a light combining means for combining modulated three color lights and emitting the same in the same direction. Further, a polarization beam splitter may be disposed between the electro-optical device and the color combining unit. In the latter case, the present invention can be applied to a configuration in which the electro-optical device is fixed to the surface of the polarization beam splitter. Even when the present invention is applied to a reflective projection display device,
It is possible to obtain substantially the same effects as those of the transmission type projection display device.

(3) The electro-optical device is not limited to a liquid crystal panel (for example, a liquid crystal light valve), but may be, for example, a device using a micromirror or a CCD (Charge Coupled Device). The prism is a prism composite 22
However, the present invention is not limited to the dichroic prism in which two types of color selection surfaces are formed along the bonding surface of the four triangular prisms, but may be a dichroic prism with one type of color selection surface or a polarization beam splitter. . Alternatively, the prism may be such that a light-selecting surface is arranged in a substantially hexahedral light-transmitting box and a liquid is filled therein.

(4) Further, as a projection type display device,
There are a front projection display device that performs projection from the direction in which the projected image is observed, and a rear projection display device that performs projection from the side opposite to the direction in which the projected image is observed. , And can be applied to any of them.

[0069]

According to the present invention, the holder of the electro-optical device holding the electro-optical device is fixed to the prism by the base to which the electro-optical device holder is fixed and the leg fixed to the prism. By using the fixed frame, the number of members to be attached to the prism in the light incident or outgoing direction can be reduced, and the device can be reduced in size and the efficiency of assembly work can be increased.

Further, by increasing the elasticity by using the connecting portions of the legs, the deformation caused by the difference in the coefficient of thermal expansion between the fixed frame and the prism can be suppressed, and the pixel shift of the device can be prevented. Further, by fixing the fixed frame and the prism at a plurality of locations around the fixed frame, the fixed frame and the electro-optical device holder can be stably fixed to the prism.

In addition, according to the present invention, the adjustment of the focus and the alignment of the electro-optical device are facilitated, which can contribute to the improvement of the positional accuracy.

[Brief description of the drawings]

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

FIG. 2A is a diagram showing a planar arrangement of each component inside the apparatus shown in FIG. 1; (B) The figure which shows the three-dimensional arrangement | positioning of the same component.

FIG. 3A is a view illustrating a part of an optical lens unit and a projection lens unit. (B) Schematic configuration diagram of an optical system.

FIG. 4 is a perspective view showing the relationship between a head plate, a prism unit, and a liquid crystal panel unit.

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

FIG. 6 is a partial perspective view showing an example of the shape of a fixed frame according to the embodiment of the present invention.

FIG. 7 is a flowchart showing a process of mounting the liquid crystal panel unit according to the embodiment of the present invention.

FIG. 8 is an assembly diagram of the prism composite and the liquid crystal panel unit according to the embodiment of the present invention.

FIG. 9 is a view for explaining assembly of a prism composite and a liquid crystal panel unit according to another embodiment of the present invention.

FIG. 10 is an exploded configuration diagram showing a liquid crystal panel unit of a projection display device according to the related art.

FIG. 11 is a flowchart showing a conventional method of attaching a liquid crystal panel unit of a projection display device.

[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 22R, 22G, 22B Light incidence Surface 30 Head plate 40R, 40G, 40B Liquid crystal panel 50R, 50G, 50B Liquid crystal panel unit 51 Electro-optical device holder 52 First frame 52c Screw hole 53 Second frame 56 Screw 57 Fixed frame 57a Base 57b Leg 57b Leg 57c Screw hole 57d Fixed plane portion 57e Connecting portion 58 Prism fixing plate 61R, 61G, 61B Polarizing plate

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02F 1/13 505 G03B 21/00 D G03B 21/00 33/12 33/12 H04N 5/74 K H04N 5 / 74 G02B 7/18 A F term (reference) 2H043 BA03 2H088 EA14 EA15 HA05 HA13 HA20 MA16 5C058 AA06 BA35 EA11 EA26 5G435 AA00 AA12 AA17 AA18 BB12 BB17 CC12 DD02 DD05 EE02 EE05 GG04 GG04 GG18 GG04 GG18 GG01 GG18 GG01 GG18 GG01 GG18 GG01 GG18 GG01 GG18 GG04 GG18 GG01 GG18 GG04 GG01 GG18 GG01 GG01 GG01 GG18 GG01 GG18 GG04 GG01 LL15

Claims (16)

[Claims] A prism, an electro-optical device holder holding the electro-optical device, a base for fixing the electro-optical device holder, and legs extending from the base and fixed to the prism. An optical device comprising: a fixing frame body; and a leg of the fixed frame body to which the electro-optical device holder is fixed is fixed to the prism with a fixing material. 2. The optical device according to claim 1, wherein a metal layer is formed at a position where the leg of the prism is fixed, and the fixing material is metal. 3. The optical device according to claim 2, wherein the fixing material is solder. 4. The optical device according to claim 1, wherein the fixing material is a non-metallic adhesive. 5. The optical device according to claim 4, wherein a base treatment for increasing an adhesive force of the adhesive is performed at a position where the leg of the prism is fixed. 6. The leg portion has a fixing flat portion provided for fixing to the prism, and a connecting portion connecting the fixing flat portion and the pedestal portion. The optical device according to claim 1, wherein the optical device has a plane area smaller than a plane area of the fixing plane portion. 7. The optical device according to claim 1, wherein an outer peripheral shape of a surface of the base facing the prism is larger than an outer peripheral shape of a surface of the prism facing the base. 8. A prism, a prism fixing plate fixed to upper and lower surfaces of the prism, an electro-optical device holder holding an electro-optical device, a base for fixing the electro-optical device holder, and the base And a fixing frame having legs fixed to the prism fixing plate, wherein the legs of the fixing frame to which the electro-optical device holder is fixed are fixed to the prism fixing plate. The optical device fixed by. 9. The optical device according to claim 8, wherein a metal layer is formed at a position where the leg of the prism fixing plate is fixed, and the fixing material is metal. 10. The fixing material according to claim 9, wherein the fixing material is solder.
The optical device according to any one of the preceding claims. 11. The optical device according to claim 8, wherein the fixing material is a non-metallic adhesive. 12. The optical device according to claim 11, wherein a base treatment for increasing an adhesive force of the adhesive is performed on a position of the prism fixing plate to which the leg is fixed. 13. The leg portion has a fixing flat portion provided for fixing to the prism fixing plate, and a connecting portion connecting the fixing flat portion and the base portion, and a cross-sectional area of the connecting portion. The optical device according to any one of claims 8 to 12, wherein the diameter is smaller than the plane area of the fixing plane portion. 14. The optical device according to claim 8, wherein an outer peripheral shape of a surface of the base facing the prism is larger than an outer peripheral shape of a surface of the prism facing the base. 15. The optical device according to claim 1, wherein the legs are provided at a plurality of positions around the base. 16. A projection display device using the optical device according to claim 1 and comprising a projection lens for projecting light modulated by the electro-optical device.