JP3744236B2 - Optical member fixing device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an optical member fixing device 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.
[0002]
[Prior art]
The projection display device enlarges and projects an image on a screen via a projection lens or the like. Such a projection-type display device decomposes a white light beam from a light source into light beams of three colors of red, blue, and green, and these light beams of each color are called light valves such as a liquid crystal panel unit. Then, the modulated light flux of each color after modulation is optically synthesized by the prism to re-synthesize the white light flux and enlarge and project it onto the screen via the 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 light beams of each color of a prism which is a light combining means.
[0004]
As described above, when the liquid crystal panel unit is attached corresponding to the light incident surface of the light beam of each color of the prism, various adjustments are required.
[0005]
For example, each liquid crystal panel unit that modulates light separated into red, green, and blue performs pixel alignment adjustment (alignment adjustment), and each image forming surface that is the subject is positioned within the allowable focal depth of the projection lens Adjustment (focus adjustment) is necessary.
[0006]
27 and 28 show an example of a conventional optical adjusting device of this type.
[0007]
A projection lens 2001 is arranged corresponding to the prism composite 2000. Liquid crystal panel units 2005, 2006, and 2007 are attached to the three surfaces 2002, 2003, and 2004 of the prism composite 2000, respectively. 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 the projected image is enlarged and projected onto the screen 2008 via the projection lens 2001. Make adjustments and alignment adjustments.
[0008]
[Problems to be solved by the invention]
When the liquid crystal panel units 2005, 2006, and 2007 are fixed to the three surfaces 2002, 2003, and 2004 of the prism composite 2000 with an adhesive, an adjustment member for adjusting the position of the liquid crystal display panel unit is interposed. To fix. However, since such adjustment members at a plurality of positions are interposed, in order to irradiate the ultraviolet curable resin applied to the adjustment member at this position with ultraviolet light, the ultraviolet curable resin of the position adjustment member is applied to the ultraviolet curable resin. In order to reliably irradiate ultraviolet rays, the optical fibers for irradiating ultraviolet rays must be directed from many directions.
[0009]
For this reason, the number of optical fibers increases, and a light source must be prepared corresponding to the number of optical fibers. Therefore, there is a problem that an apparatus for irradiating ultraviolet rays is complicated and expensive.
[0010]
SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide an optical member fixing device that can solve the above-described problems and can reduce the cost and simplify the structure when the optical member is fixed by irradiating light such as ultraviolet rays. .
[0011]
[Means for Solving the Problems]
  The present invention provides a first optical member, a projection lens disposed at a position facing the first surface of the first optical member, and a second of the first optical member facing the surface on which the projection lens is disposed. And an optical member fixing device that fixes the second optical member disposed on each of the third surface and the fourth surface perpendicular to the second surface by using an adjustment member and a photo-curing adhesive. There,
  A light source;
  First light guiding means for guiding light from the light source;
  Second light guiding means for guiding light from the light source;
  First light reflecting means for reflecting light from the light source emitted from the light guiding means;
  Second light reflecting means for reflecting light from the light source emitted from the light guiding means;
With
  Light from the light source emitted in the first direction from the first light guiding means is interposed between the first optical member and the second optical member disposed on the third surface of the first optical member. Supplying to the light curing adhesive,
  Light from the light source emitted in the first direction from the second light guiding means is interposed between the first optical member and the second optical member disposed on the fourth surface of the first optical member. Supplying to the light curing adhesive,
  The light from the light source emitted in the first direction from the first light guiding means is reflected by the first light reflecting means, and the light from the light source emitted in the first direction from the second light guiding means is the first light. Reflected by two-light reflecting means and interposed between the first optical member and the second optical member disposed on the second surface of the first optical member in a direction different from the first direction. Supplying to the light-curing adhesive;
An optical member fixing device is characterized.
[0012]
  In the present invention,The light guiding means applies light to cure when the adjustment member for finely adjusting the position of the second optical member with respect to the first optical member is fixed using a photo-curing adhesive.
[0013]
  The light reflecting means supplies the light from the light source to the photo-curing adhesive of the adjusting member on the first direction side, or the light from the light source.A direction different from the first directionSupplying to the photocuring adhesive of the adjustment member on the side can be performed selectively.
[0014]
Accordingly, it is not necessary to provide light guide means corresponding to the positions of the adjustment members, the structure can be simplified, and the number of light sources can be reduced, so that the cost can be reduced.
[0015]
  The present inventionIn the optical member fixing device, the first optical member and the second optical member constitute a part of an optical system of the projection display device.
[0016]
  The present inventionIn the optical member fixing device, the second optical member is prepared corresponding to red, blue, and green, and the red second optical member, the blue second optical member, and the green The second optical member is positioned and fixed on a different surface of the first optical member.
[0017]
  The present inventionThe first optical member and the second optical member constituting the optical system of the projection display apparatus can be fixed while having a simple configuration.
[0018]
  In the present invention, the light reflecting means includes a mirror that reflects the light emitted from the light guiding means, and the light emitted from the light guiding means is different from the first direction when the mirror is positioned at a reflection position. A moving part for supplying to the photo-curing adhesive interposed between the first optical member and the second optical member in a direction;Have
[0019]
  In the present invention,When the moving part positions the mirror at the reflection position or retracts the light from the light source sent through the light guiding means, the adjustment member on the first direction side, orA direction different from the first directionIt can be selectively supplied to any of the side adjustment members.
[0020]
  According to the present invention, in the optical member fixing device, the adjustment member on the first direction side is the second optical member of the red second optical member and the blue second optical member, The adjustment member in a direction different from the direction is the green second optical member.
[0021]
  In the present invention,Each optical member of red, blue, and green can be fixed with an adjusting member.
[0022]
  The present inventionThe light guide means is an optical fiber, and has an air blow supply section for supplying air blow to a peripheral region including the light guide means.
[0023]
  In the present invention,Since the air blow supply unit can supply air blow to the peripheral area of the optical fiber, it prevents the vapor of the photo-curing resin generated during light irradiation from adhering to the optical fiber, and the light source sent through the optical fiber Light can be efficiently supplied to the ultraviolet curable resin.
[0024]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a preferred embodiment of an optical adjusting device including an optical member fixing device of the present invention.
[0025]
Specifically, the optical adjusting device 100 has a structure as shown in FIGS.
[0026]
The optical adjustment device 100 of FIGS. 1 to 4 is a device for optically positioning the second optical member with respect to the first optical member.
[0027]
Here, an example of an apparatus including a first optical member and a second optical member that are adjustment targets of the optical adjustment apparatus 100 will be described.
[0028]
FIG. 19 shows an example of a projection display device as an example including the first optical member and the second optical member adjusted by the optical adjustment device 100 shown in FIG.
[0029]
The exterior case 2 of the projection display device 1 has a rectangular parallelepiped shape, and this exterior case 2 basically includes an upper case 3, a lower case 4, and a front case 5 that defines the front of the device. Has been. From the center of the front case 5, a portion on the front end side of the projection lens unit 6 protrudes.
[0030]
FIG. 20 shows the arrangement of the components in the exterior case 2 of the projection display device 1. As shown in FIG. 2, a power supply unit 7 is disposed on the rear end side inside the outer case 2, and a light source lamp unit 8 and an optical unit 9 are disposed at a position adjacent to the front side of the apparatus. In the center of the front side of the optical unit 9, the base end side of the projection lens unit 6 is located.
[0031]
On one side of the optical unit 9, an interface board 11 on which an input / output interface circuit is mounted and a video board 12 on which a video signal processing circuit is mounted are arranged. 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 respectively arranged at the left and right corners on the front end side of the apparatus.
[0032]
A cooling intake fan 15A is disposed in the center on the upper surface side of the optical unit 9, and a circulation fan 15B for forming a cooling circulation flow is disposed in the center on the bottom surface side of the optical unit 9. An exhaust fan 16 is disposed 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 15 </ b> A 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.
[0033]
A floppy disk drive unit 18 is arranged immediately above the power supply unit 7 as shown in FIG.
[0034]
FIG. 22 shows a portion of 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 that is a color composition unit are sandwiched and held between upper and lower light guides 901 and 902. 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.
[0035]
The prism 22 is fixed to the back surface of the head plate 30. The base end side of the projection lens unit 6 is similarly fixed to the front surface of the head plate 30.
[0036]
The optical system shown in FIG. 23 has a light source lamp 805, an illumination optical system 923 composed of integrator lenses 921 and 922 that are uniform illumination optical elements, and a white light beam W emitted from the illumination optical system 923 in red, A color separation optical system 924 that separates light beams R, G, and B of green and blue, three liquid crystal panels (also referred to as liquid crystal panel units) 40R, 40G, and 40B as light valves that modulate the light beams of each color, and modulation A prism 22 and a projection lens unit 6 for enlarging and projecting the combined light beam on the screen 7 are configured as a color combining optical system for recombining the combined color light beam.
[0037]
A light guide system 927 is provided that can guide the blue light beam B among the color light beams separated by the color separation optical system 924 in FIG. 23 to the corresponding liquid crystal panel 40B.
[0038]
The reflection mirror 931 of the uniform illumination optical system 923 bends the optical axis 1a of the outgoing light from the illumination optical system at a right angle.
[0039]
The color separation optical system 924 in FIG. 23 includes a blue-green reflection dichroic mirror 941, a green reflection dichroic mirror 942, 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 are reflected at right angles toward the green reflecting dichroic mirror 942.
[0040]
The red light beam R passes through the mirror 941, is reflected at a right angle by the rear reflecting mirror 943, and is emitted from the red light beam emitting portion 944 to the prism 22 side. The blue and green light beams B and G reflected by the mirror 941 are reflected by the green reflection dichroic mirror 942 only at a right angle, and emitted from the green light beam emitting portion 945 to the color synthesis optical system side. The
[0041]
The blue light beam B that has passed through the mirror 942 is emitted from the blue light beam emitting portion 946 to the light guide system 927 side. The distances from the white light beam emitting portion of the uniform illumination optical element to the color light emitting portions 944, 945, and 946 in the color separation optical system 924 are all equal.
[0042]
Each color light beam emitted from each emission part is incident on condensing lenses 951, 952, 953 to be collimated.
[0043]
Of the color beams R, G, and B converted into parallel light, red and green light beams R and G are incident on the liquid crystal panels 40R and 40G and modulated, and image information corresponding to each color light is added. . That is, the liquid crystal panels 40R, 40G, and 40B are switching-controlled by an image signal corresponding to image information by a driving unit (not shown), thereby modulating each color light passing therethrough. As such driving means, known means can be used as they are.
[0044]
On the other hand, the blue light beam B is guided to the corresponding liquid crystal panel 40B through the light guide system 927, and is similarly modulated according to the image information. As the liquid crystal panels 40R, 40G, and 40B of this example, for example, those using polysilicon TFTs as switching elements can be used.
[0045]
The light guide system 927 includes an incident side reflection mirror 971, an emission side reflection mirror 972, an intermediate lens 973 disposed therebetween, and a condensing lens 953 disposed on the front side of the liquid crystal panel 40B.
[0046]
Next, each color beam modulated through the liquid crystal panels 40R, 40G, and 40B is incident on the prism 22 and recombined there. A color synthesizing optical system is configured using a prism 22 formed of a dichroic prism. The recombined color image is enlarged and projected onto the projection plane 7 at a predetermined position via the projection lens unit 6.
[0047]
The prism 22 is configured by joining four prisms 21 having a right isosceles triangular section as shown in FIG. Liquid crystal panel units 50R, 50G, and 50B having the same structure are attached to the three light incident surfaces 22R, 22G, and 22B that function as the light incident surfaces among the side surfaces of the prism 22, respectively. Liquid crystal panels 40R, 40G, and 40B are held in the liquid crystal panel units 50R, 50G, and 50B, respectively.
[0048]
In FIG. 24, among the liquid crystal panel units 50R, 50G, and 50B, each component of the liquid crystal panel unit 50R that holds the liquid crystal panel 40R is disassembled. 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.
[0049]
As shown in FIG. 24, the panel frame plate 51 of the liquid crystal panel unit 50 </ b> R includes a first frame plate 52 and a second frame plate 53, and the liquid crystal panel 40 </ b> R is sandwiched between the frame plates 52 and 53. It is held in the state.
[0050]
The liquid crystal panel unit 50 </ b> R includes a fixed frame plate 54 that is bonded and fixed to the light incident surface 22 </ b> R of the prism 22. The panel frame plate 51 is detachably fixed to the fixed frame plate 54 via the intermediate frame plate 55.
[0051]
The liquid crystal panel unit 50R includes several wedges 57 as positioning means. In FIG. 24, only one of them is shown. A wedge guide surface with which the inclined surface 57 a of the wedge 57 abuts 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 are driven to the left and right of the first frame plate 52, and the pushing amount of these wedges 57 is adjusted to adjust the liquid crystal panel 40R. Perform positioning.
[0052]
The liquid crystal panel unit 50R of FIG. 24 is attached to 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. The intermediate frame plate 55 is positioned on the surface of the fixed frame plate 54 bonded and fixed, and the intermediate frame plate 55 is screwed with four screws 56. After that, 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.
[0053]
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 intermediate frame plate 55 along the wedge guide surface formed on the first frame plate 52. Then, by adjusting the insertion amount of each wedge 57, alignment adjustment and focus adjustment of the liquid crystal panel 40R are performed.
[0054]
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.
[0055]
In this manner, the liquid crystal panel units 50R, 50G, and 50B are attached to the three surfaces 22R, 22B, and 22G of the prism composite 22.
[0056]
The optical adjustment device 100 of FIG. 1 is a device that is attached while optically adjusting the prism 22 and the three liquid crystal panels 40G, 40B, and 40R as shown in FIGS. 25 and 26 of the projection display device 1 shown in FIG. is there. The prism 22 corresponds to a first optical member, and the liquid crystal panels 40G, 40B, and 40R correspond to a second optical member.
[0057]
In FIGS. 25 and 26, the X axis is oriented in the horizontal direction, the Y axis is oriented in the vertical direction, and the Z axis is perpendicular to the X and Y axes, that is, parallel to the optical axis of the projection lens 106. Direction.
[0058]
Also in FIG. 1, the Z axis is a direction parallel to the optical axis CL of the projection lens 106, the Y axis is a direction perpendicular to the paper surface in FIG. 1, and the X axis is a direction orthogonal to the Z axis and the Y axis. For the Z axis, there is a direction for rotational adjustment in the θ direction, for the Y axis there is a direction for rotational adjustment in the H direction, and for the X axis, there is a direction for rotational 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 with respect to the prism 22 in such six-axis directions.
[0059]
In order to move and position each liquid crystal panel in the 6-axis direction, the 6-axis stages 112, 114, and 116 correspond to the liquid crystal panels 40G, 40B, and 40R as shown in FIG. Is provided. These 6-axis stages 112, 114, 116 are mounted on a base 118. On the base 118, a light source unit 120, a UV irradiation unit (ultraviolet irradiation unit) 122, a projection lens 106, and the like are mounted.
[0060]
The controller / image processing device 124 controls the operations of the above-described six-axis stages 112, 114, 116, the light source unit 120 and the UV irradiation unit 122, and the operation of the CCD camera (charge coupled device camera) 130 which is a light receiving means. Thus, the image captured from the CCD camera 130 can be appropriately processed.
[0061]
FIG. 2 is a side view showing the optical adjustment device 100 of FIG. 1 more specifically. The optical adjustment device 100 of FIG. 2 includes 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 fixation.
[0062]
On the base 118, the six-axis stages 112, 114, and 116 shown in FIG. In FIG. 2, one 6-axis stage 112 is representatively shown, and a first optical member holding portion 134 is set on the base 118 between the 6-axis stage 112 and the projection lens 106. The first optical member holding portion 134 can detachably hold the prism 22 that is the first optical member.
[0063]
Corresponding to the optical axis CL of the projection lens 106, the reflecting means 136 is mounted on the base 118. The reflecting means 136 includes a mirror 136A and a moving unit 138 for holding and moving the mirror 136A.
[0064]
The mirror 136A can be set at a predetermined angle α by the support 140 of the moving unit 138. This angle α can be set to, for example, an angle of 70 degrees with respect to the optical axis CL.
[0065]
The support 140 is fixed to the carrier 138A of the moving unit 138. The carrier 138A has a knob 138B. For example, when the user operates the knob 138B, the carrier 138A can be manually moved on the base 118 in the Z-axis direction and positioned. However, it may be automated by a motor or the like instead of manually.
[0066]
The reason why the mirror 136A of the reflecting means 136 can be moved and positioned using the moving unit 138 is as follows. That is, since the projection distance of the projection display device 1 as described above varies depending on the product specifications or types, the position of the mirror 136A of the reflecting means 136 is changed or the angle is appropriately changed in accordance with the difference in the projection distance. This is because it is desirable to change.
[0067]
The carrier 138A moves along the rail 118D. The optical axis CL of the projection lens 106 is positioned at a height LH with respect to the reference plane 118C, for example.
[0068]
The lower support 132 in FIG. 2 is set on the base 118. An upper support 134 is further set on the lower support 132. The upper support 134 is equipped with a screen (projection plane) 150 and a plurality of CCD cameras 130.
[0069]
The screen 150 is set to an angle of β, for example, 50 degrees with respect to the optical axis CL of the projection lens 106, that is, the Z axis.
[0070]
From each 6-axis stage 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. The projection lens 106 projects this light onto the mirror 136A of the reflecting means 136, and the mirror 136A reflects this light so that it can be projected onto the screen 150 in an enlarged manner. Each CCD camera 130 converts the enlarged image for optical adjustment projected on the screen 150 into an optical / electrical signal and supplies it to the controller / image processing device 124 of FIG.
[0071]
FIG. 3 is a front view showing the base 118, the lower support 132, the upper support 134, the screen 150, the 6-axis stage 112, and the like.
[0072]
FIG. 4 shows a screen 150, an upper support 134, a CCD camera 130, six-axis stages 112, 114, and 116, a prism 22, a projection lens 106, a reflection means 136, and the like.
[0073]
Next, referring to FIG. 5, an example of the structure of the six-axis stages 112, 114, 116 will be described. The chuck 162 can detachably hold the panel frame plate 51 and the liquid crystal panel 40R (or 40B, 40G) of the liquid crystal panel unit 50R (or 50B, 50G) of FIG. The six-axis stages 112, 114, and 116 have the same structure, and the operation means 160 is used to add the X axis, Y axis, Z axis, V axis, H axis, and θ axis as shown in FIG. The chuck 162 and the liquid crystal panel 40R (or 40B, 40G) can be moved and positioned along the six axes. That is, the chuck 162 has, for example, a claw 162A and a claw 162B. The corresponding liquid crystal panel 40R (or 40B or 40G) is detachably sandwiched between the claw 162A and 162B, and the broken line in FIG. Hold as shown. A light source 170 is disposed behind the liquid crystal panel 40G held in this way. In the holding part 172 of the light source 170, optical fiber end faces 174 are arranged at four corners, for example, at equal intervals.
[0074]
Optical fiber arrays 180 and 180 for ultraviolet irradiation are arranged on the right and left of the light source 170.
[0075]
An air supply unit 190 is provided above the light source 170 and the chuck 162. The air supply unit 190 includes an air hose 192 and an air blow generation source 194. When the air blow generation source 194 is activated, air blow is blown to the optical fiber end face 174 of the optical fiber array 180 and the holding unit 172 via the air hose 192. be able to.
[0076]
The claw 162A on the upper side of the chuck 162 is moved along the Y direction by an 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 be irradiated with ultraviolet rays by the UV irradiation unit 122. The optical fiber array 180 is a linear array of a plurality of optical fibers.
[0077]
The end face 174 of the optical fiber is arranged at an interval with respect to a holding portion 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.
[0078]
An illumination unit 200 as shown in FIGS. 7, 8 and 9 is fixed to the holding portion 172. A polarizing filter 202 is attached to the end of the illumination unit 200.
[0079]
As shown in FIG. 9, the illumination unit 200 is arranged corresponding to the prism 22 and, for example, the liquid crystal panel 40R. The illumination unit 200 holds four optical fibers 174A, and these four optical fibers 174A can be detachably connected to the connection portion 208 of the light source unit 120 shown in FIGS. . The light source unit 120 can adjust the amount of light by operating the light control 210.
[0080]
In any case, the 6-axis stages 112, 114, 116 shown in FIG. 1 have a holding portion 172 and an illumination unit 200 as shown in FIGS. 6 to 9, respectively. Illumination light is supplied to a corresponding liquid crystal panel by a light source unit 120 as shown in FIGS.
[0081]
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. ing. However, the 6-axis stages 114 and 116 face each other.
[0082]
Next, using these 6-axis stages 112, 114, 116, etc., the liquid crystal panels 40G, 40B, 40R, which are second optical members, are optically positioned and adjusted with respect to the prism 22, which is the first optical member. A working example will be described.
[0083]
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. As a result, the prism 22 is positioned between the projection lens 106 and the three six-axis stages 112, 114, and 116. As the projection lens 106, one having the same performance as the projection lens 6 of the projection display device of FIG. 1 already described can be used.
[0084]
Next, the light source unit 120 of FIG. 1 is operated, and the liquid crystal panel 40G (40B, 40R) is used with the end faces 174 of the four optical fibers of the light sources 170 of the six-axis stages 112, 114, 116 of FIG. To emit light for illumination. The liquid crystal panel 40G (40B, 40R) is mechanically fixed between the claws 162A, 162B of each chuck 162.
[0085]
The illumination light transmitted from the light sources 170 of the six-axis stages 112, 114, and 116 passes through the liquid crystal panels 40G, 40B, and 40R fixed in this way and the prism 22, and passes through the projection lens 106 of FIG. Thus, the light reaches the reflecting mirror 136A of the reflecting means 136. This reaching light uses the upper light region with respect to the optical axis CL. Then, the light LT is reflected by the mirror 136A, and projected on the screen 150 positioned at the upper portion.
[0086]
Each CCD camera 130 performs light / signal conversion on the image projected on the screen 150 and sends it to the controller / image processing device 124 of FIG. The image processing device 124 performs the following adjustments by operating the six-axis stages 112, 114, and 116 based on these signals, respectively. That is, the focus adjustment is performed so that each image forming surface that is a subject is positioned within the allowable focus depth of the projection lens 106. Thereafter, the respective pixels are aligned (alignment adjustment) for the liquid crystal panels 40G, 40B, and 40R.
[0087]
This focus adjustment is performed along the H, V, and Z directions. As the CCD camera used for the alignment adjustment, for example, four CCD cameras 130X shown in FIG. 3 are used, and for the focus adjustment, four CCD cameras 130Y are used.
[0088]
As described above, as shown in FIGS. 2, 3, and 4, the light LT emitted from the projection lens 106 is guided along the optical axis CL, which is the first direction, and along the second direction D2 by the mirror 136A. The light is reflected and imaged on the screen 150.
[0089]
By adopting such a light bending method, unlike the conventional case, the area occupied by the optical adjustment device 100 with respect to the floor 118C (projection area viewed from the arrow E in FIG. 2) can be made extremely small. By reducing the size as described above, more optical adjusting apparatuses 100 can be set in the factory, and the efficiency and space saving of the optical adjusting apparatus can be improved.
[0090]
Further, the reflecting means 136 of FIG. 2 can be moved and positioned along the Z direction by the moving unit 138. The reason for this movement is that the projection distance of the projection lens 106 varies depending on the format specification or size of the projection display device.
[0091]
Depending on the projection distance of the projection lens 106, the position of the mirror 136A is changed in the Z direction, or the setting angle of the mirror 136A is changed in the support 140, so that the screen 150 has an appropriate size. Now it can be enlarged and displayed. As described above, the adjustment image is enlarged and displayed on the screen 150, so that more accurate alignment adjustment and focus adjustment can be performed.
[0092]
Next, a method for fixing the optical member for fixing the liquid crystal panels 40G, 40R, and 40B that have been subjected to various adjustments as described above to the corresponding surfaces of the prism 22 will be described.
[0093]
FIG. 12 shows the liquid crystal panels 40G, 40R, and 40B, the prism 22, and the projection lens 106 whose positions are adjusted.
[0094]
Each liquid crystal panel positioned in this way needs to be fixed to the corresponding surface of the prism 22 while being adjusted using the wedge (adjustment member) 57 already described. 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.
[0095]
In order to cure the ultraviolet curable adhesive, optical fiber arrays (light guiding means) 180 and 180 and other light guiding means 240 and 240 are used. The optical fiber array 180 and the light guiding means 240 constitute an optical member fixing device. The optical fiber arrays 180 and 180 are already shown in FIG. 5, and are connected to the UV irradiation unit 122 as shown in FIG. Similarly, the light guiding means 240 and 240 are also connected to the UV irradiation unit 122. In FIG. 12, one of the wedges 57 and 57 of the liquid crystal panels 40R and 40B can be bonded by curing the ultraviolet curable adhesive by irradiating the ultraviolet rays with the light guiding means 240 and 240.
[0096]
On the other hand, the other wedges 57A and 57A of the liquid crystal panels 40R and 40B and the wedges 57B and 57B of the liquid crystal panel 40G are bonded by curing the ultraviolet curable adhesive using the optical fiber arrays 180 and 180. In this case, since the optical fiber array 180 is along the Z direction, the wedges 57A and 57A facing each other 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 optical fiber arrays 180 and 180 indicated by another pair of two-dot chain lines.
[0097]
FIG. 13 shows an example in which two pairs of optical fiber arrays 180 in this case are connected to two irradiation units 122 and 122. Other light guiding means 240 and 240 are connected to another irradiation unit 122. In this case, since three irradiation units 122, two pairs of optical fiber arrays 180, light guiding means 240, 240, and the like are necessary, the apparatus becomes large and the cost is increased.
[0098]
In addition, in the embodiment of FIGS. 12 and 13, it may be extremely difficult in terms of space to arrange two or more optical fiber arrays 180 near the prism.
[0099]
14 and 15 are more preferred embodiments than the embodiments of FIGS. In FIG. 14 and FIG. 15, compared with the embodiment of FIG. 12 and FIG. 13, one UV irradiation unit 122 and a pair of optical fiber arrays 180 can be omitted as shown in FIG.
[0100]
Other points of the embodiment of FIGS. 14 and 15 are substantially the same as those of FIGS.
[0101]
The example of FIGS. 14, 15 and 16 is characterized in that the light reflecting means 249 is provided. The light reflecting means 249 has a mirror 241 and a drive cylinder 242 as a moving unit. Such light reflecting means 249 is disposed obliquely corresponding to the corners of the prism 22 between the liquid crystal panels 40R and 40G and between the liquid crystal panels 40G and 40B.
[0102]
A procedure for sequentially irradiating the wedges 57A, 57A and 57B, 57B with ultraviolet rays using one UV irradiation unit 122 will be described.
[0103]
  As shown in FIG. 15, the moving unit 242 positions the mirror 241 in the retracted position, so that the optical fiber arrays 180 and 180 transmit the ultraviolet rays UV.First direction F1The ultraviolet curable adhesive can be cured by directly irradiating the ultraviolet curable adhesive of the wedges 57A and 57A along the line.
[0104]
  Next, in FIG. 14, the moving unit 242 moves the mirror 241 from the exit position in FIG. 15 to the entry position in FIG. 14. As a result, 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 the corresponding UV curable adhesives of the wedges 57B and 57B. The UV curable adhesive can be cured by irradiation. In other words, UV UVFirst direction F1Is bent by a 90 degree mirror 241 fromDirection F2 different from the first directionTo reach the wedge 57B.
[0105]
By adopting such a structure, one UV irradiation unit can be omitted as compared with the type shown in FIG. 12, and a pair of optical fiber arrays 180 and 180 can be omitted.
[0106]
Here, the position of the liquid crystal panels 40R and 40B is adjusted, that is, the alignment is adjusted based on the liquid crystal panel 40G after UV curing. The reason for this is to prevent the effect of displacement due to the shrinkage of the UV curable resin during UV curing. Therefore, after the liquid crystal panel 40G is cured with ultraviolet rays, the remaining two liquid crystal panels 40R and 40B are aligned and fixed with respect to the prism using the liquid crystal panel 40G as an alignment reference.
[0107]
Each of the liquid crystal panels 40G, 40R, and 40B is advanced and held to a corresponding position of the prism 22 when performing focus alignment. Before that, each liquid crystal panel stands by at a position away from the prism 22. For example, if the liquid crystal panels 40R and 40B are not separated from the prism 22 when the liquid crystal panel 40G is cured with ultraviolet light, the ultraviolet curable resin may be cured before alignment adjustment due to the wraparound of the light for ultraviolet curing. This is to prevent it.
[0108]
FIG. 17 shows an example of the structure of the light guiding means 249 described above. The ultraviolet rays UV guided from the UV irradiation unit are reflected by the mirror 241 and applied to the ultraviolet curable adhesive of the corresponding wedge 57.
[0109]
FIG. 18 shows an example of the structure of the optical fiber array 180. A plurality of optical fibers 180B are arranged in a straight line in the case 180A.
[0110]
The light source 170 shown in FIG. 5 supplies illumination light to each corresponding liquid crystal panel and prism 22, but supplies such illumination light in a spot manner using a plurality of optical fibers. ing.
[0111]
As a result, the energy for illumination can be reduced as compared with the case of using a normal illumination lamp, and uniform light is supplied corresponding to the substantially rectangular or square liquid crystal panels 40G, 40R, 40B. Can do. From this, it is possible to obtain a substantially uniform projected image when the illumination light is enlarged and projected onto the screen 150 as shown in FIG.
[0112]
In FIG. 5, the air supply unit 190 supplies air blow from the air hose 192 to the optical fiber array 180 and the optical fiber end face 174 of the light source 170 in the following cases. That is, for example, as described with reference to FIGS. 14 to 16, when UV light is irradiated from the optical fiber array 180 to the UV curable resin of the wedge, the vapor of the UV curable adhesive is changed to the optical fiber array 180 of FIG. 5 or the optical fiber. It may be formed near the end face 174. In this case, the air hose 192 is used to supply air blow to blow off the vapor of the ultraviolet curable adhesive. 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 and the end face 174 of the optical fiber of the light source 170. A reduction in efficiency can be prevented, and a reduction in the amount of illumination light from the light source 170 can be prevented.
[0113]
The present invention is not limited to the above embodiment.
[0114]
The optical adjustment device of the present invention performs adjustment by taking, for example, the prism as the first member and the liquid crystal panel as the second member of the projection display device as examples.
[0115]
Of course, the optical adjustment device and the optical adjustment method of the present invention can be used for positioning adjustment of the first member and the second member of other types of optical devices. Further, the method of chucking the liquid crystal panel is not limited to the sandwich type shown in the figure, but may be a vacuum suction type or a magnetic adsorption type.
[0116]
【The invention's effect】
According to the first aspect of the present invention, the light guiding means applies light to cure when the adjusting member for finely adjusting the position of the second optical member with respect to the first optical member is fixed using the photo-curing adhesive.
[0117]
  The light reflecting means supplies the light from the light source to the photo-curing adhesive of the adjusting member on the first direction side, or the light from the light source.A direction different from the first directionSupplying to the photocuring adhesive of the adjustment member on the side can be performed selectively.
[0118]
Accordingly, it is not necessary to provide light guide means corresponding to the positions of the adjustment members, the structure can be simplified, and the number of light sources can be reduced, so that the cost can be reduced.
[0119]
In the second and third aspects of the invention, the first optical member and the second optical member constituting the optical system of the projection display apparatus can be fixed while having a simple configuration.
[0120]
  In the invention of claim 4, the moving part positions the mirror at the reflection position or retracts the light from the light source sent through the light guiding means to the first direction side adjustment member,A direction different from the first directionIt can be selectively supplied to any of the side adjustment members.
[0121]
In this invention of Claim 5, each optical member of red, blue, and green can be fixed with an adjustment member.
[0122]
In the invention of claim 6, since the air blow supply unit can supply air blow to the peripheral region of the optical fiber, the optical fiber is prevented from adhering to the vapor of the photo-curing resin generated during light irradiation on the optical fiber. Thus, the light from the light source sent through can be efficiently supplied to the ultraviolet curable resin.
[Brief description of the drawings]
FIG. 1 is a schematic view showing an embodiment of an optical adjusting 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;
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 its arrangement member.
FIG. 7 is a diagram showing an end face of the lighting unit.
FIG. 8 is a side view showing an illumination unit and one liquid crystal panel.
FIG. 9 is a diagram showing an illumination unit, a liquid crystal panel, a prism, and the like.
FIG. 10 is a view showing a light source unit for illumination.
11 is a side view of the light source unit of FIG.
FIG. 12 is a diagram showing an example of an apparatus that irradiates ultraviolet rays to a wedge that fixes a prism and a liquid crystal panel.
13 is a diagram specifically showing an apparatus for irradiating ultraviolet rays in FIG. 12. FIG.
FIG. 14 is a diagram showing another example of irradiating ultraviolet rays to a wedge that fixes a prism and a liquid crystal panel.
FIG. 15 is a diagram showing another operation in the unit for irradiating with ultraviolet rays in FIG. 14;
16 is a diagram specifically showing a unit for irradiating ultraviolet rays shown in FIGS. 14 and 15. FIG.
FIG. 17 is a diagram showing an example of another light guiding means for irradiating the wedge on the prism side with ultraviolet rays.
FIG. 18 is a perspective view showing an example of an optical fiber array as light guiding means.
FIG. 19 is a perspective view showing a projection display device as an example including a prism of a first member and a liquid crystal panel of a second member applied to the optical adjustment device of the present invention.
20 is a plan view showing the internal structure of the projection display apparatus shown in FIG.
21 is a longitudinal sectional view of the projection display device of FIG.
FIG. 22 is a diagram showing an optical configuration of a projection display apparatus.
FIG. 23 shows 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 seen from another angle.
FIG. 27 is a side view showing an example of a conventional optical adjusting device.
28 is a plan view of the conventional optical adjusting device of FIG. 27. FIG.
[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 an ultraviolet curable adhesive
130 (130X, 130Y) ... CCD camera (light receiving means)
F1 ... 1st direction
F2 ... Second direction
136: Reflecting means
136A ... Mirror
138 ... Moving part of the reflecting means
150 ... Screen (projection surface)
170 ... Light source for illumination
180 ... Optical fiber array (light guiding means)
190 ... Air supply part
192 ... Air hose
249 ... Light reflecting means
241 ... Mirror
242 ... Moving unit

Claims (6)

A first optical member, a projection lens disposed at a position facing the first surface of the first optical member, a second surface of the first optical member facing the surface on which the projection lens is disposed, An optical member fixing device that fixes the second optical member arranged on each of the third surface and the fourth surface perpendicular to the second surface, using an adjustment member and a photo-curing adhesive,
A light source;
First light guiding means for guiding light from the light source;
Second light guiding means for guiding light from the light source;
First light reflecting means for reflecting light from the light source emitted from the light guiding means;
Second light reflecting means for reflecting light from the light source emitted from the light guiding means;
With
Light from the light source emitted in the first direction from the first light guiding means is interposed between the first optical member and the second optical member disposed on the third surface of the first optical member. Supplying to the light curing adhesive,
Light from the light source emitted in the first direction from the second light guiding means is interposed between the first optical member and the second optical member disposed on the fourth surface of the first optical member. Supplying to the light curing adhesive,
The light from the light source emitted in the first direction from the first light guiding means is reflected by the first light reflecting means, and the light from the light source emitted in the first direction from the second light guiding means is the first light. Reflected by a two-light reflecting means and interposed between the first optical member and the second optical member disposed on the second surface of the first optical member in a direction different from the first direction. Supplying to the light-curing adhesive;
An optical member fixing device.  The optical member fixing device according to claim 1, wherein the first optical member and the second optical member constitute part of an optical system of a projection display device.  The second optical member is prepared corresponding to red, blue, and green, and the second optical member of red, the second optical member of blue, and the second optical member of green are The optical member fixing device according to claim 2, wherein the optical member fixing device is positioned and fixed on different surfaces of the first optical member.  The light reflecting means includes a mirror that reflects the light emitted from the light guiding means, and the light emitted from the light guiding means when the mirror is positioned at a reflection position, in the direction different from the first direction. The optical member fixing device according to claim 1, further comprising: a moving unit that supplies the light curable adhesive interposed between one optical member and the second optical member.  The adjustment member on the first direction side is the second optical member of the red second optical member and the blue second optical member, and the adjustment member in a direction different from the first direction is the The optical member fixing device according to claim 4, wherein the second optical member is green.  The optical member fixing device according to claim 4, wherein the light guide means is an optical fiber, and has an air blow supply unit that supplies air blow to a peripheral region including the light guide means.

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