JP2000147343A - Optical member fixing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical member fixing device which allows the reduction of a cost and the simplification of a structure when optical members are fixed by irradiating these members with light, such as UV rays. SOLUTION: A light source and regulating members 57A and 57B for finely regulating the positions of second optical members 40G, 40R and 40B with respect to first optical member when positioning and fixing the second optical members 40G, 40R and 40B to the first member are fixed between the first member and the second optical members 40G, 40R and 40B by using a photosetting adhesive. In such a case, the device is equipped with a light guide means 180 for curing the photosetting adhesive by applying the light from the light source to the adhesive and a light reflecting means 249 for selectively executing the supply of the light from the light source to the photosetting adhesive of the regulating members 57A and 57B on a first direction F1 side and the supply of the light from the light source to the photosetting adhesive of the regulating members 57A and 57B on the second direction F2 side different from the first direction F1 side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of fixing an optical member used for positioning a second optical member such as a liquid crystal panel with respect to a first optical member such as a prism used in a projection display device. It concerns the device.

[0002]

2. Description of the Related Art A projection display apparatus projects an enlarged image on a screen through a projection lens or the like. Such a projection display device is a device called a light valve of a liquid crystal panel unit or the like that separates a white light beam from a light source into light beams of three colors, red, blue and green. Then, the light is modulated in accordance with the image information, and the modulated light flux of each color after the modulation is subjected to light synthesis by a prism to re-synthesize a white light flux, and is enlarged and projected on a screen via a projection lens.

[0003] In this type of projection display device, a liquid crystal panel unit as a light valve is attached to a light incident surface of a light beam of each color of a prism which is a light combining means.

As described above, when the liquid crystal panel unit is mounted corresponding to the light incident surface of the light beam of each color of the prism,
Various adjustments need to be made.

[0005] For example, each pixel adjustment of each liquid crystal panel unit that modulates the light separated into red, green and blue is performed (alignment adjustment), and each image formation to be a subject within the allowable depth of focus of the projection lens is performed. It is necessary to adjust (focus adjustment) so that the surface is positioned.

FIGS. 27 and 28 show an example of this type of conventional optical adjustment device.

A projection lens 2001 is arranged corresponding to the prism composite 2000. The three surfaces 2002, 2003, and 2004 of the prism composite 2000 are respectively provided with liquid crystal panel units 2005, 2006, and 2006.
2007 is attached. In this case, in order to perform the focus adjustment and the alignment adjustment as described above, the light L1, L2, and L3 are irradiated and enlarged and projected on the screen 2008 via the projection lens 2001, thereby achieving the focus as described above. Make adjustments and alignment adjustments.

[0008]

SUMMARY OF THE INVENTION The prism composite 200
When fixing the liquid crystal panel units 2005, 2006, and 2007 to the three surfaces 2002, 2003, and 2004 with an adhesive, the liquid crystal panel units are fixed with an adjusting member for adjusting the position of the liquid crystal display panel unit. Like that. However, since the adjusting members at such a plurality of positions are interposed, in order to irradiate the ultraviolet curable resin applied to the adjusting member at this position with ultraviolet rays, the ultraviolet curable resin of the position adjusting member is required to be irradiated. In order to ensure that the ultraviolet rays can be applied, the optical fibers for ultraviolet irradiation must be directed from many directions.

For this reason, the number of optical fibers is increased, and furthermore, a light source must be prepared corresponding to the number of optical fibers, so that a device for irradiating ultraviolet rays becomes complicated and costly. is there.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide an optical member fixing device capable of reducing the cost and simplifying the structure when fixing the optical member by irradiating light such as ultraviolet rays. The purpose is.

[0011]

According to a first aspect of the present invention, when the second optical member is positioned and fixed with respect to the light source and the first optical member, the second optical member is positioned relative to the first member. In order to fix an adjusting member for finely adjusting the position between the first member and the second optical member using a light-curing adhesive, light from the light source is given to the light-curing adhesive. Light guide means for curing, and light from the light source sent through the light guide means is supplied to the light curing adhesive of the adjustment member on the first direction side, and is sent through the light guide means. Light reflecting means for selectively supplying the light from the light source to the light curing adhesive of the adjustment member in a second direction different from the first direction. Optical member fixing device.

According to the first aspect of the present invention, the light guide means includes:
When an adjustment member for finely adjusting the position of the second optical member with respect to the first optical member is fixed using a light-curing adhesive, light is applied to cure the adjustment member.

The light reflecting means supplies the light from the light source to the light curing adhesive of the adjustment member in the first direction, or the light from the light source to the light of the adjustment member in the second direction different from the first direction. Feeding the cured adhesive can be done selectively.

Accordingly, it is not necessary to provide light guide means corresponding to the positions of the adjusting members, and the structure can be simplified and the number of light sources can be reduced, so that the cost can be reduced.

According to a second aspect of the present invention, in the optical member fixing device according to the first aspect, the first optical member and the second optical member form a part of an optical system of a projection display device.

According to a third aspect of the present invention, in the optical member fixing device according to the second aspect, the second optical member is provided corresponding to red, blue, and green, and the second optical member is provided with the red second optical member. The blue second optical member and the green second optical member are positioned and fixed on different surfaces of the first optical member.

According to the second and third aspects of the present invention, the first optical member and the second optical member constituting the optical system of the projection display device can be fixed with a simple structure.

According to a fourth aspect of the present invention, in the optical member fixing device according to any one of the first to third aspects, the light reflecting means includes a mirror for reflecting the light from the light source, and the mirror positioned at a reflecting position. When positioned, the light from the light source is supplied to the photocurable adhesive of the adjustment member on the first direction side,
A moving unit configured to supply the light from the light source to the light curing adhesive of the adjustment member on the second direction side when the mirror is positioned at the retracted position.

According to the fourth aspect of the present invention, the moving unit positions or retracts the mirror at the reflection position, so that the light from the light source transmitted through the light guide means is adjusted in the first direction. Or the adjustment member on the second direction side can be selectively supplied.

According to a fifth aspect of the present invention, in the optical member fixing device according to the fourth aspect, the adjustment member on the first direction side is the green second optical member and the green on the second direction side. The adjusting members are the red second optical member and the blue second optical member.

According to the fifth aspect of the invention, each of the red, blue and green optical members can be fixed by the adjusting member.

According to a sixth aspect of the present invention, in the optical member fixing device according to the first aspect, the light guide means is an optical fiber, and an air blow supply unit for supplying air blow to a peripheral area including the light guide means. Have.

According to the sixth aspect of the present invention, since the air blow supply unit can supply the air blow to the peripheral area of the optical fiber, it is possible to prevent the vapor of the photocurable resin generated at the time of light irradiation from adhering to the optical fiber. In addition, the light of the light source transmitted through the optical fiber can be efficiently supplied to the ultraviolet curable resin.

[0024]

FIG. 1 shows a preferred embodiment of an optical adjusting device including an optical member fixing device according to the present invention.

The optical adjustment device 100 has a structure as shown in FIGS. 2, 3 and 4.

The optical adjustment device 100 shown in FIGS.
This is an apparatus for optically positioning the second optical member with respect to the optical member.

Here, an example of a device including a first optical member and a second optical member to be adjusted by the optical adjustment device 100 will be described.

FIG. 19 shows the optical adjustment device 100 shown in FIG.
An example of a projection display device is shown as an example including a first optical member and a second optical member adjusted by the following.

The outer case 2 of the projection display device 1 has a rectangular parallelepiped shape. The outer case 2 is basically composed of an upper case 3, a lower case 4, and a front case which defines the front of the device. 5 is comprised. The front end portion of the projection lens unit 6 projects from the center of the front case 5.

FIG. 20 shows an arrangement of each component in the exterior case 2 of the projection display device 1. As shown in FIG. 2, a power supply unit 7 is disposed at the rear end side inside the outer case 2, and at a position adjacent to the front side of the device,
A light source lamp unit 8 and an optical unit 9 are arranged. The base end side of the projection lens unit 6 is located at the front center of the optical unit 9.

On one side of the optical unit 9, an interface board 11 on which an input / output interface circuit is mounted is provided.
And a video board 12 on which a video signal processing circuit is mounted. On the upper side of the light source lamp unit 8 and the optical unit 9, a control board 13 for device drive control is arranged as shown in FIG. Speakers 14R and 14L are arranged at left and right corners on the front end side of the apparatus, 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 arranged on 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.

A floppy disk drive unit 18 is disposed immediately above the power supply unit 7 as shown in FIG.

FIG. 22 shows the optical unit 9. As shown in FIG. 22, the optical unit 9 has a configuration in which optical elements other than the prism 22 as the color synthesizing means are held between upper and lower light guides 901 and 902 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.

The prism 22 is fixed to the back surface of the head plate 30. The base end of the projection lens unit 6 is similarly fixed to the front surface of the head plate 30.

The optical system shown in FIG.
And an integrator lens 92 as a uniform illumination optical element
An illumination optical system 923 including an illumination optical system 923 and a white light beam W emitted from the illumination optical system
A color separation optical system 924 that separates the blue light fluxes R, G, and B.
And three liquid crystal panels (also referred to as liquid crystal panel units) 40R, 40 as light valves for modulating each color light beam.
G, 40B, a prism 22 as a color synthesizing optical system for re-synthesizing the modulated color light beam, and a projection lens unit 6 for enlarging and projecting the synthesized light beam on the screen 7.

There is provided a light guide system 927 that can guide the blue light beam B of each color light beam separated by the color separation optical system 924 of FIG. 23 to the corresponding liquid crystal panel 40B.

Reflection mirror 931 of uniform illumination optical system 923
Bends the optical axis 1a of the light emitted from the illumination optical system at a right angle.

The color separation optical system 924 shown in FIG. 23 includes a blue-green reflecting dichroic mirror 941, a green reflecting dichroic mirror 942, and a reflecting mirror 943. First, in the blue-green reflecting dichroic mirror 941, the blue light beam B and the green light beam G are reflected at a right angle, and head toward the green reflecting dichroic mirror 942.

The red light beam R passes through the mirror 941, is reflected at a right angle by the rear reflection mirror 943, and is emitted from the emission portion 944 of the red light beam to the prism 22 side. The blue and green light 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 light emission part 945 to the color combining optical system side. You.

The blue light flux B that has passed through the mirror 942
Are emitted from the emission portion 946 of the blue light beam to the light guide system 927 side. From the emission part of the white light beam of the uniform illumination optical element,
Emission portions 944 and 944 of the respective color light beams in the color separation optical system 924
The distances to 945 and 946 are all equal.

Each color light beam emitted from each emission part is incident on a condenser lens 951, 952, 953 and is converted into a parallel light.

Each color light beam R,
Of the G and B, the red and green luminous fluxes R and G enter the liquid crystal panels 40R and 40G and are modulated, and image information corresponding to each color light is added. That is, the switching of these liquid crystal panels 40R, 40G, and 40B is controlled by an image signal corresponding to image information by a driving unit (not shown), thereby modulating each color light passing therethrough. As such a driving means, a known means can be used as it is.

On the other hand, the blue light 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, as the liquid crystal panels 40R, 40G, and 40B of this example, for example, those 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.

Next, each of the liquid crystal panels 40R, 40G, 40
Each color light beam modulated through B enters the prism 22, where it is recombined. A color synthesizing optical system is configured using a prism 22 composed of a dichroic prism. The recombined color image is enlarged and projected on a projection surface 7 at a predetermined position via the projection lens unit 6.

The prism 22 is formed by joining four prisms 21 having a right-angled isosceles triangle cross section as shown in FIG. Liquid crystal panel units 50R, 50G, and 50B having the same structure are attached to three light incident surfaces 22R, 22G, and 22B that function as light incident surfaces among the side surfaces of the prism 22, respectively. Each liquid crystal panel unit 50R, 50
G and 50B have liquid crystal panels 40R and 40B, respectively.
G and 40B are held.

FIG. 24 shows a liquid crystal panel unit 50R,
Of the 50G and 50B, each component of the liquid crystal panel unit 50R holding the liquid crystal panel 40R is exploded. An example of an attachment structure for attaching the liquid crystal panel 40R to the light incident surface 22R of the prism 22 will be described with reference to FIG.

As shown in FIG. 24, the panel frame plate 51 of the liquid crystal panel unit 50R includes a first frame plate 52 and a second frame plate 53, and the liquid crystal panel 40R is interposed between these frame plates 52,53. Is held in a state of being sandwiched.

The liquid crystal panel unit 50R includes the prism 2
A fixed frame plate 54 adhered and fixed to the second light incident surface 22R is provided. The panel frame plate 51 is provided with the intermediate frame plate 55 interposed therebetween.
It is detachably fixed to the fixed frame plate 54 side.

The liquid crystal panel unit 50R has several wedges 57 as positioning means. FIG.
Shows only one of them. A wedge guide surface with which the inclined surface 57a of the wedge 57 contacts is formed on the panel frame plate 51. After temporarily fixing the panel frame plate 51 to the intermediate frame plate 55, for example, four wedges 57
Is 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.

The liquid crystal panel unit 50R of FIG. 24 is mounted on the light incident surface 22R of the prism 22 in the following procedure. Next, the fixed frame plate 54 is positioned and bonded and fixed to the surface 22R of the prism composite 22. Position the intermediate frame plate 55 on the surface of the fixed frame plate
The intermediate frame plate 55 is screwed with the 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. In this state, the panel frame plate 51 is pushed toward the intermediate frame plate 55.

Thereafter, the wedge 57 is used to position the liquid crystal panel 40R with respect to the light incident surface 22R of the prism 22. For example, four wedges 57 are inserted between the temporarily fixed panel frame plate 51 and the intermediate frame plate 55 along the wedge guide surface formed on the first frame plate 52.
And by adjusting the insertion amount of each wedge 57,
The alignment and focus of the liquid crystal panel 40R are adjusted.

When the positioning is completed, these wedges 57 are 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.

Thus, the liquid crystal panel unit 50 is attached to the three surfaces 22R, 22B, and 22G of the prism composite 22.
Install R, 50G, 50B.

The optical adjustment device 100 shown in FIG. 1 includes a prism 22 and three liquid crystal panels 40G, 40B, 4 as shown in FIGS. 25 and 26 of the projection display device 1 shown in FIG.
It is a device to be attached while performing optical adjustment of 0R. The prism 22 corresponds to a first optical member, and the liquid crystal panel 40
G, 40B, and 40R correspond to the second optical member.

In FIGS. 25 and 26, the X axis points in the horizontal direction, the Y axis points in the vertical direction, and the Z axis points in the X direction.
The projection lens 106 in a direction perpendicular to the axis and the Y axis.
Is a direction parallel to the optical axis of

Also in FIG. 1, the Z axis is the projection lens 106.
1, the Y axis is a direction perpendicular to the sheet of FIG. 1, and the X axis is a direction orthogonal to the Z axis and the Y axis. The Z axis has a direction of rotation adjustment in the θ direction, the Y axis has a direction of rotation adjustment in the H direction, and the X axis has a direction of rotation adjustment in the V direction. That is, the liquid crystal panels 40G, 40B, and 40R, which are the second optical members, are moved and positioned in such six-axis directions with respect to the prism 22.

In order to move such liquid crystal panels in the directions of six axes for positioning, each liquid crystal panel 40G, 4
0B and 40R, respectively, as shown in FIG.
Axial stages 112, 114, 116 are provided.
These six-axis stages 112, 114, and 116 are mounted on a base 118. A light source unit 120, a UV irradiation unit (ultraviolet irradiation unit) 122, a projection lens 106, and the like are mounted on the base 118.

The controller / image processing device 124 includes the above-described six-axis stages 112, 114, 116, the operations of the light source unit 120 and the UV irradiation unit 122,
CCD camera (charge-coupled device camera) 1 as light receiving means
By controlling the operation of the camera 30 or the like, the image captured from the CCD camera 130 can be appropriately processed.

FIG. 2 is a side view showing the optical adjustment device 100 of FIG. 1 more specifically. Optical adjustment device 100 of FIG.
Has a base 118, a lower support 132 and an upper support 134. The base 118 includes a caster 118A for movement and a stopper 118B for fixing.

On the base 118, the six-axis stages 112, 114 and 116 of FIG. 1 are mounted. FIG. 2 typically shows one six-axis stage 112, and a first optical member holding unit 134 is set on a base 118 between the six-axis stage 112 and the projection lens 106. The first optical member holding section 134 can detachably hold the prism 22 as the first optical member.

According to the optical axis CL of the projection lens 106,
Reflecting means 136 is mounted on base 118. The reflecting means 136 includes a mirror 136A and a moving unit 13 for holding and moving the mirror 136A.
8 is provided.

The mirror 136A can be set at a predetermined angle α by the support 140 of the moving section 138. This angle α is, for example, 7 with respect to the optical axis CL.
An angle of 0 degrees can be set.

The support 140 is fixed to the carrier 138A of the moving section 138. This carrier 138A is
It has a knob 138B. For example, when the user operates this knob 138B, the carrier 138A
Can be manually moved on the base 118 in the Z-axis direction for positioning. However, it may be automated by a motor or the like instead of manually.

The reason that the mirror 136A of the reflecting means 136 can be moved and positioned by using the moving section 138 is as follows. That is, since the projection distance of the projection display device 1 described above differs depending on the product specifications or types, the position of the mirror 136A of the reflection means 136 is changed or the angle is changed as appropriate in accordance with the difference in the projection distance. Is desirably changed.

The carrier 138A moves along the rail 118D. The optical axis CL of the projection lens 106 is positioned, for example, at a height LH with respect to the reference plane 118C.

The lower support 132 shown in FIG.
8 is set. An upper support 134 is further set on the lower support 132. The upper support 134 includes a screen (projection surface) 150,
A plurality of CCD cameras 130 are mounted.

The screen 150 has, for example, an angle β with respect to the optical axis CL of the projection lens 106, ie, the Z axis.
As an example, it is set to 50 degrees.

From each of the six-axis stages 112 in FIG. 1, light for optical adjustment is sent to the projection lens 106 through the corresponding liquid crystal panel and the prism 22. Projection lens 10
6 projects the light on a mirror 136A of the reflection means 136, and the mirror 136A reflects the light so that it can be enlarged and projected on the screen 150. Each CCD camera 130 converts the enlarged image for optical adjustment projected on the screen 150 into a light / electric signal, and supplies it to the controller / image processing device 124 in FIG.

FIG. 3 shows the base 118 and the lower support 13.
FIG. 2 is a front view showing an upper support 134, a screen 150, a six-axis stage 112, and the like.

FIG. 4 shows a screen 150, an upper support 134, a CCD camera 130, and a six-axis stage 112, 1.
14 and 116, the prism 22, the projection lens 106, the reflection means 136, and the like are shown.

Next, referring to FIG.
2, 114, 116 will be described. The chuck 162 is connected to the liquid crystal panel unit 50R (or 5) shown in FIG.
0B, 50G) and a liquid crystal panel 40R.
(Or 40B, 40G) can be detachably held. The six-axis stages 112, 114, and 116 have the same structure, and are operated by the operating means 160 to add the X-axis, the Y-axis, the Z-axis, and the V-axis, the H-axis, and the θ-axis as shown in FIG. It has a function of moving and positioning the chuck 162 and the liquid crystal panel 40R (or 40B, 40G) along six axes. That is, this chuck 162
For example, it has a claw 162A and a claw 162B, and the claw 162A, 162B allows the corresponding liquid crystal panel 4
OR (or 40B or 40G) is detachably sandwiched and held as shown by the broken line in FIG. A light source 170 is disposed behind the liquid crystal panel 40G held in this manner. The holding portion 172 of the light source 170 includes
The end faces 174 of the optical fibers are arranged at four corners, for example, at equal intervals.

On the right and left of the light source 170, optical fiber arrays 180 and 180 for irradiating ultraviolet rays are arranged.

Above the light source 170 and the chuck 162,
An air supply unit 190 is provided. This air supply unit 1
90 has an air hose 192 and an air blow generation source 194. When the air blow generation source 194 operates, the air blow can be blown to the optical fiber array 180 and the end face 174 of the optical fiber of the holding unit 172 via the air hose 192.

The upper claw 162A of the chuck 162 is moved along the Y direction by operating means (not shown) to sandwich and hold the liquid crystal panel. The claw 162 is attached to the main body 166 side. The optical fiber arrays 180 and 180 can irradiate ultraviolet rays by the UV irradiating unit 122. Optical fiber array 180
Is a linear arrangement of a plurality of optical fibers.

The end face 174 of the optical fiber is arranged at a distance from the holding section 172 as an arrangement member. The end face 174 of the optical fiber shown in FIG. 6 supplies illumination light, that is, light used for optical adjustment, to the corresponding liquid crystal panels 40G, 40R, and 40B shown in FIG.

The lighting unit 200 as shown in FIGS. 7, 8 and 9 is fixed to the holding portion 172. A polarizing filter 202 is attached to an end of the lighting unit 200.

As shown in FIG. 9, an illumination unit 200 is provided corresponding to the prism 22 and, for example, the liquid crystal panel 40R.
Place. This lighting unit 200 holds four optical fibers 174A, and these four optical fibers 174A are connected to each other through a connector 204 as shown in FIGS.
Can be detachably connected to the connection portion 208 of the light source unit 120 shown in FIG. The light source unit 120 can adjust the amount of light by operating the light control 210.

In any case, each of the six-axis stages 112, 114, and 116 shown in FIG. 1 has a holder 172 and an illumination unit 200 as shown in FIGS. The unit 200 supplies illumination light to a corresponding liquid crystal panel by a light source unit 120 as shown in FIGS.

As shown in FIGS. 1 and 4, the axis of the six-axis stage 112 is oriented in the Z direction, the axis of the six-axis stage 114 is oriented in the X direction, and the axis of the six-axis stage 116 is also oriented in the X direction. Facing the direction. However, 6-axis stages 114 and 11
6 faces each other.

Next, these six-axis stages 112 and 11
Using a prism 2 as a first optical member.
2, the liquid crystal panels 40G, 4 as the second optical members
An example of the operation of optically adjusting the positions of 0B and 40R will be described.

As shown in FIGS. 1 and 2, the prism 22 and the projection lens 106 are fixed to the first optical member holding portion 134. The prism 22 and the projection lens 106 are called a head body, and are integrated. Thereby, the prism 22
Is a projection lens 106 and three 6-axis stages 112, 1
Positioned between 14,116. Projection lens 106
Is the projection lens 6 of the projection display device of FIG.
The same performance can be used.

Next, the light source unit 120 of FIG. 1 is operated to use the four optical fiber end faces 174 of the light source 170 of each of the six-axis stages 112, 114 and 116 in FIG. ) To emit light for illumination. And the claws 162A, 1 of each chuck 162
Between 62B, the liquid crystal panel 40G (40B, 4
OR) is fixed.

The liquid crystal panel 40G fixed as described above,
Light for illumination sent from the light source 170 of each of the six-axis stages 112, 114, and 116 passes through the prisms 40B and 40R, and passes through the projection lens 106 of FIG. 2 to the reflection mirror 136A of the reflection means 136. To reach. This arriving light utilizes the upper light region with respect to the optical axis CL. Then, this light LT is reflected by the mirror 136A, and is enlarged and projected on the screen 150 located above.

Each CCD camera 130 converts the image projected on the screen 150 into a light / signal and sends it to the controller / image processing device 124 shown in FIG.
The image processing device 124 performs the following adjustment by operating the six-axis stages 112, 114, and 116 based on these signals, respectively. That is, focus adjustment is performed so that each image forming surface to be a subject is located within the allowable depth of focus of the projection lens 106. Thereafter, mutual pixel alignment (alignment adjustment) is performed for the liquid crystal panels 40G, 40B, and 40R.

This focus adjustment is performed along the H, V, and Z directions. As the CCD camera used for this alignment adjustment, for example, four CCD cameras 13 shown in FIG.
0X is used, and four CCD cameras 130Y are used for focus adjustment.

As described above, the light LT emitted from the projection lens 106 as shown in FIGS. 2, 3, and 4 is guided along the optical axis CL, which is the first direction, and is mirrored by the mirror 136A in the second direction D2. The light is reflected to form an image on the screen 150.

By adopting such a light bending method, the floor 1 of the optical adjustment device 100 differs from the conventional one.
The area occupied by 18C (projected area viewed from arrow E in FIG. 2) can be extremely reduced. With such a small size, such an optical adjustment device 100 can be installed in a factory.
Can be set more, and the operation of the optical adjustment device can be made more efficient and space can be saved.

The reflecting means 136 shown in FIG.
8 enables to move and position along the Z direction. The reason for such movement is that the projection distance of the projection lens 106 varies depending on the format specification or size of the projection display device.

By changing the position of the mirror 136A in the Z direction or changing the set angle of the mirror 136A in the support 140 according to the size of the projection distance of the projection lens 106, the screen 15 is moved.
The image can be enlarged and displayed with an appropriate size for 0. By displaying the adjustment image on the screen 150 in an enlarged manner, more accurate alignment adjustment and focus adjustment can be performed.

Next, a method of fixing the optical members for fixing the liquid crystal panels 40G, 40R, and 40B, which have been adjusted as described above, to the corresponding surfaces of the prism 22 will be described.

FIG. 12 shows the liquid crystal panels 40G, 40R, 40B, the prism 22, and the projection lens 106 whose positions have been adjusted.

Each of the liquid crystal panels thus positioned needs to be fixed to the corresponding surface of the prism 22 while being adjusted using the wedge (adjustment member) 57 described above. When fixing the liquid crystal panel and the light incident surface of the prism 22 via the wedge 57, for example, an ultraviolet curable adhesive is used.

In order to cure the ultraviolet curable adhesive, optical fiber arrays (light guide means) 180, 18
0 and another light guiding means 240, 240 are used. The optical fiber array 180 and the light guiding means 240 constitute an optical member fixing device. Optical fiber arrays 180, 18
0 has already been shown in FIG. 5, and as shown in FIG.
It is connected to the irradiation unit 122. Similarly, the light guide means 240 and 240 are connected to the UV irradiation unit 122. In FIG. 12, the liquid crystal panels 40R, 4
One of the wedges 57, 57 of the light guide means 240,
By irradiating with UV light 240, the UV curable adhesive can be cured and bonded.

On the other hand, the liquid crystal panels 40R, 40B
The other wedges 57A, 57A and wedges 57B, 57B of the liquid crystal panel 40G are connected to the optical fiber arrays 180, 18 respectively.
Bonding is performed by curing the ultraviolet curable adhesive using 0. In this case, since the optical fiber array 180 is along the Z direction, the facing wedges 57A, 57A can be irradiated with ultraviolet rays. However, the wedges 57B and 57B cannot be directly irradiated with ultraviolet rays as they are. Therefore, it is necessary to prepare another pair of optical fiber arrays 180 and 180 indicated by two-dot chain lines.

FIG. 13 shows an example in which two pairs of optical fiber arrays 180 in this case are connected to two irradiation units 122,122. Further, other light guide means 240, 2
40 is connected to another irradiation unit 122. In this case, since three irradiation units 122, two pairs of optical fiber arrays 180, and light guiding means 240, 240, etc. are required, the apparatus becomes large-sized and the cost increases.

Further, in the embodiment of FIGS. 12 and 13, two pairs or more optical fiber arrays 180 are provided.
It may be extremely difficult to place a near the prism in terms of space.

Therefore, there is a preferred embodiment shown in FIGS. 14 and 15 as compared with the embodiment shown in FIGS. 12 and 13. 14 and 15, compared to the embodiment of FIGS. 12 and 13, one UV irradiation unit 122 and a pair of optical fiber arrays 180 can be omitted as shown in FIG.

The other points of the embodiment of FIGS. 14 and 15 are substantially the same as those of FIGS. 12 and 13.

The examples of FIGS. 14, 15 and 16 are characterized in that a light reflecting means 249 is provided. The light reflecting means 249 has a mirror 241 and a driving cylinder 242 as a moving unit. Such light reflecting means 249
Between the liquid crystal panels 40R and 40G and the liquid crystal panel 40
Between G and 40B, they are arranged obliquely corresponding to the corners of the prism 22.

Using one UV irradiation unit 122,
A procedure for sequentially irradiating the wedges 57A, 57A and 57B, 57B with ultraviolet rays will be described.

As shown in FIG. 15, the moving section 242 positions the mirror 241 at the retreat position, whereby the optical fiber arrays 180 and 180 emit the ultraviolet rays UV to the second position.
The ultraviolet curable adhesive of the wedges 57A, 57A can be directly irradiated along the direction F2 to cure the ultraviolet curable adhesive.

Next, in FIG. 14, the moving section 242 moves the mirror 241 from the exit position in FIG. 15 to the entry position in FIG. Thus, the mirrors 241 and 241 reach the positions corresponding to the optical fiber arrays 180 and 180, and the ultraviolet rays UV of the optical fiber arrays 180 and 180 are reflected by the mirror 241 and correspond to the corresponding wedges 57B and 57B.
Irradiation is performed on the UV-curable adhesive B to cure the UV-curable adhesive. That is, the ultraviolet rays UV
It is bent by the mirror 241 from the direction F2 by 90 degrees and reaches the wedge 57B along the first direction F1.

By adopting such a structure, FIG.
As compared with the type shown in (1), one UV irradiation unit can be omitted, and the optical fiber arrays 180 and 180 can be omitted for one pair.

Here, the liquid crystal panels 40R and 40B are adjusted in position with respect to the liquid crystal panel 40G after ultraviolet curing.
That is, the alignment is adjusted. The reason for this is to avoid the influence of displacement due to shrinkage of the ultraviolet curable resin during ultraviolet curing. Therefore, after the liquid crystal panel 40G is cured by ultraviolet light, the remaining two liquid crystal panels 40R and 40B are aligned and fixed to the prism using the liquid crystal panel 40G as an alignment reference.

Each of the liquid crystal panels 40G, 40R, 40B has
When performing focus alignment, the prism 22 is advanced and held at a corresponding position of the prism 22. Before that,
Each liquid crystal panel stands by at a position away from the prism 22. For example, when the liquid crystal panels 40R and 40B are not separated from the prism 22 during the ultraviolet curing of the liquid crystal panel 40G, the ultraviolet curable resin may be cured before the alignment adjustment due to the wraparound of the ultraviolet curing light. This is to prevent it.

FIG. 17 shows an example of the structure of the light guide means 249 described above. The ultraviolet light UV guided from the UV irradiation unit is reflected by the mirror 241 and is irradiated on the ultraviolet curable adhesive of the corresponding wedge 57.

FIG. 18 shows an example of the structure of the optical fiber array 180. In the case 180A, a plurality of optical fibers 180B are arranged on a straight line.

The light source 170 shown in FIG. 5 supplies illumination light to each corresponding liquid crystal panel and prism 22, and supplies such illumination light spotwise using a plurality of optical fibers. It has become.

As a result, the energy for illumination can be reduced as compared with the case of using a lamp for ordinary illumination, and the substantially rectangular or square liquid crystal panel 40G,
It is possible to supply uniform light corresponding to 40R and 40B. From this, a substantially uniform projected image can be obtained when the illumination light is enlarged and projected on the screen 150 as shown in FIG. 2 through the projection lens at the time of various optical adjustments.

In FIG. 5, the air supply unit 190 supplies an air blow from the air hose 192 to the optical fiber array 180 and the end face 174 of the optical fiber of the light source 170 in the following cases. That is, for example, FIG.
As described with reference to FIG. 16, when ultraviolet light is irradiated from the optical fiber array 180 to the ultraviolet curable resin of the wedge, the vapor of the ultraviolet curable adhesive is generated near the optical fiber array 180 and the end face 174 of the optical fiber in FIG. May be formed. In this case, by supplying air blow using the air hose 192, the vapor of the ultraviolet curable adhesive is blown off. By doing so, it is possible to prevent the vapor of the ultraviolet curable adhesive from adhering to the end face of each optical fiber of the optical fiber array 180 or the end face 174 of the optical fiber of the light source 170, and to irradiate the ultraviolet ray from the optical fiber array 180. A decrease in efficiency can be prevented, and a decrease in the amount of illumination light from the light source 170 can be prevented.

The present invention is not limited to the above embodiment.

The optical adjustment device of the present invention performs the adjustment using, for example, a prism as a first member and a liquid crystal panel as a second member of a projection display device.

The present invention is not limited to this.
It is of course possible to use the optical adjustment device and the optical adjustment method of the present invention for positioning adjustment of the member and the second member. Further, the method of chucking the liquid crystal panel is not limited to the sandwiched type shown in the figure, but may be a vacuum suction type or a magnetic adsorption type.

[0116]

According to the first aspect of the present invention, the light guiding means transmits light when an adjusting member for finely adjusting the position of the second optical member with respect to the first optical member is fixed using a light curing adhesive. Give and cure.

The light reflecting means supplies the light from the light source to the light-curing adhesive of the adjustment member in the first direction, or the light from the light source to the light in the adjustment member in the second direction different from the first direction. Feeding the cured adhesive can be done selectively.

As a result, it is not necessary to provide light guide means corresponding to the positions of the adjustment members, and the structure can be simplified and the number of light sources can be reduced, so that the cost can be reduced.

According to the second and third aspects of the present invention, the first optical member and the second optical member constituting the optical system of the projection display device can be fixed with a simple structure.

According to the fourth aspect of the present invention, the moving unit positions or retracts the mirror at the reflection position, so that the light from the light source transmitted through the light guiding means can be adjusted in the first direction. Or the adjustment member on the second direction side can be selectively supplied.

According to the fifth aspect of the present invention, each of the red, blue and green optical members can be fixed by the adjusting member.

According to the sixth aspect of the present invention, since the air blow supply unit can supply the air blow to the peripheral area of the optical fiber, it is possible to prevent the vapor of the photocurable resin generated at the time of light irradiation from adhering to the optical fiber. In addition, the light of the light source transmitted through the optical fiber can be efficiently supplied to the ultraviolet curable resin.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing an embodiment of an optical adjustment device having an optical member fixing device of the present invention.

FIG. 2 is a side view showing the optical adjustment device of FIG. 1;

FIG. 3 is a front view showing the optical adjustment device of FIG. 2;

FIG. 4 is a plan view showing the optical adjustment device of FIG. 2;

FIG. 5 is a perspective view showing a part of a six-axis stage for each liquid crystal panel.

FIG. 6 is a front view showing an end face of an optical fiber for illumination and an arrangement member thereof.

FIG. 7 is a diagram showing an end surface of the lighting unit.

FIG. 8 is a side view showing the lighting unit and one liquid crystal panel.

FIG. 9 illustrates a lighting unit, a liquid crystal panel, a prism, and the like.

FIG. 10 is a diagram showing a light source unit for illumination.

11 is a side view of the light source unit of FIG.

FIG. 12 is a diagram illustrating an example of an apparatus that irradiates ultraviolet light to a wedge that fixes a prism and a liquid crystal panel.

FIG. 13 is a view specifically showing an apparatus for irradiating the ultraviolet rays in FIG. 12;

FIG. 14 is a diagram showing another example of irradiating ultraviolet rays to a wedge for fixing a prism and a liquid crystal panel.

FIG. 15 is a view showing another operation in the unit for irradiating ultraviolet rays in FIG. 14;

FIG. 16 is a diagram specifically showing a unit for irradiating ultraviolet rays shown in FIGS. 14 and 15;

FIG. 17 is a diagram showing an example of another light guide means for irradiating ultraviolet rays to a wedge on the prism side.

FIG. 18 is a perspective view showing an example of an optical fiber array as light guiding means.

FIG. 19 shows an example in which a prism as a first member and a liquid crystal panel as a second member applied to the optical adjustment device of the present invention are provided.
FIG. 2 is a perspective view showing a projection display device.

20 is a plan view showing the internal structure of the projection display device of FIG.

FIG. 21 is a longitudinal sectional view of the projection display device of FIG. 19;

FIG. 22 is a diagram showing an optical configuration of a projection display device.

FIG. 23 is a diagram showing the optical structure in more detail.

FIG. 24 is an exploded perspective view showing a structural example of a prism and a liquid crystal panel.

FIG. 25 is a perspective view showing a liquid crystal panel, a prism, a projection lens, and the like.

FIG. 26 is a perspective view showing a prism, a liquid crystal panel, a projection lens, and the like as viewed from another angle.

FIG. 27 is a side view showing an example of a conventional optical adjustment device.

FIG. 28 is a plan view of the conventional optical adjustment device of FIG. 27;

[Explanation of symbols]

22 Prism (first optical member) 40G, 40R, 40B Liquid crystal panel (second optical member) 57A, 57B, 57 Adjustment member 100 Optical adjustment device 106 Projection lens 112, 114, 116: 6-axis stage 118: Base 122: UV irradiation unit for curing UV-curable adhesive 130 (130X, 130Y): CCD camera (light receiving means) F1 ... 1st direction F2 2nd direction 136 reflecting unit 136A mirror 138 moving unit of reflecting unit 150 screen (projection surface unit) 170 light source for illumination 180 ..Optical fiber array (light guide means) 190 air supply section 192 air hose 249 light reflection section 241 mirror 242 moving section

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshitake Kobayashi 3-5-3 Yamato, Suwa-shi, Nagano Seiko Epson Corporation (72) Inventor Manabu Nagasaka 3-5-35 Yamato, Suwa-shi, Nagano Seiko-Epson F term (reference) inside 2H038 AA54 2H043 AE02 AE24

Claims (6)

[Claims] A light source; and an adjusting member for finely adjusting the position of the second optical member with respect to the first member when positioning and fixing the second optical member with respect to the first optical member. Light guide means for applying light from the light source to the light-curable adhesive to cure the light-curable adhesive between the first member and the second optical member using a light-curable adhesive; Supplies the light from the light source sent through the light-curing adhesive of the adjustment member in the first direction to the light from the light source sent through the light guide means. An optical member fixing device, comprising: a light reflection unit for selectively performing supply to the light curing adhesive of the adjustment member on a second direction side different from one direction. 2. The optical system according to claim 1, wherein the first optical member and the second optical member form a part of an optical system of a projection display.
6. The optical member fixing device according to claim 5. 3. The second optical member is provided corresponding to red, blue, and green, and the second optical member of red,
The optical member fixing device according to claim 2, wherein the blue second optical member and the green second optical member are positioned and fixed on different surfaces of the first optical member. 4. The light-reflecting means includes: a mirror for reflecting light from the light source; and light-curing bonding of the adjustment member on the first direction side when the mirror is positioned at a reflection position. And a moving unit for supplying light from the light source to the light-curing adhesive of the adjustment member in the second direction when the mirror is positioned at the retracted position. The optical member fixing device according to any one of the above. 5. The adjusting member on the first direction side is the green second optical member, and the adjusting member on the second direction side is the red second optical member and the blue second optical member. The optical member fixing device according to claim 4, which is a two-optical member. 6. The light guiding means is an optical fiber,
The optical member fixing device according to claim 4, further comprising an air blow supply unit configured to supply an air blow to a peripheral area including the light guide unit.