JP3501889B2 - Mounting method of imaging optical element in liquid crystal color projection device etc. - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of adding and mixing display images of black and white liquid crystal panels provided for red (R), green (G) and blue (B). The present invention relates to a method for mounting an imaging optical element in a liquid crystal color projection device or the like that performs projection. 2. Description of the Related Art In recent years, with the trend toward larger screens of televisions, a liquid crystal projection device for enlarging and projecting an image of a liquid crystal television panel onto a screen has become smaller, lighter, and easier to handle. Has been attracting attention. This type of liquid crystal color projection apparatus uses a color separation (dichroic) mirror to separate light sources of all wavelengths into R (red), G (green), and B (blue) light.
The light is separated (spectralized) into color light, and these R, G, and B lights are made incident on a monochrome liquid crystal panel provided for each color, and an R image, a G image, and a B image are generated by each liquid crystal panel, and a dichroic prism ( These are mixed by a prism type) or a dichroic mirror (mirror type), and a color image is reproduced on a large screen via a projection optical system (for example, JP-A-63-158591). FIG. 6 is a schematic diagram showing a conventional example of a liquid crystal color projection apparatus called a mirror system using a dichroic mirror for color separation and mixing of light. In the figure, 1
Is a light source such as a xenon lamp. Light emitted from the light source 1 is reflected by a reflecting mirror 2 whose reflecting surface is a paraboloid and converts the light from the light source into parallel light parallel to the optical axis. The light is converged toward the projection optical system 19. At this time, the parallel rays converged by the converging optical system 3 first enter the blue dichroic mirror 4 that separates and reflects only blue light. The blue light 5 separated by the blue dichroic mirror 4 is reflected by the total reflection mirror 6 in a direction parallel to the optical axis of the converging optical system 3 and enters the transmission type liquid crystal panel 7. A voltage is selectively supplied to the liquid crystal panel 7 in accordance with a constituent pixel of an arbitrary image to be projected, and the blue light 5 transmitted through the liquid crystal panel 7 becomes a blue image light 5a having an image signal. [0004] The blue component 5 is lost by the blue dichroic mirror 4 and the light 8 transmitted through the mirror 4 becomes yellow. The yellow light 8 enters the red dichroic mirror 9, the red light 10 is separated, and the remaining green light 11 passes through the mirror 9. The separated red light 10 enters a transmissive liquid crystal panel 12 having the same configuration as the liquid crystal panel 7 and becomes red image light 10a. The blue image light 5a and the red image light 10a are mixed by the mixing dichroic mirror 13 to form the magenta image light 1a.
It becomes 4. On the other hand, the green light 11 is emitted from the liquid crystal panels 7,1.
The light enters the transmissive liquid crystal panel 15 having the same configuration as that of 2, and becomes green image light 11a. The green image light 11a is reflected by the total reflection mirror 16 and enters the mixing dichroic mirror 17. Green image light 1
The 1a and the magenta image light 14 are mixed by a mixing dichroic mirror 17 to become an RGB-added mixed image light 18, and the image light 18 is enlarged and projected on a screen 20 by a projection optical system 19, whereby a color image is formed. Will be played. In contrast to the above-mentioned mirror system, the prism system is a system in which four triangular prisms are bonded together, and a dichroic prism in which a color mixing film is interposed on the bonding surface is used to mix RGB image light beams. It has the same function as the mixing dichroic mirrors 13 and 17 in the mirror system. In the above-described liquid crystal color projector, the mounting accuracy of the spectral optical element including the dichroic mirrors 4 and 9 and the total reflection mirror 6 is about ± 0.2 mm. On the other hand, the liquid crystal panels 7, 12, 15 and the dichroic mirrors 13, 17 and the total reflection mirror 16, which form the imaging optical system 22, use the pixels of each panel as the screen 2
Since it is necessary to completely overlap on the zero, the mounting position and the mounting angle are very strict as compared with the spectroscopic optical element 21, and high accuracy of about ± 0.025 mm is required. Conventionally, as shown in FIGS. 7 and 8, a pair of support members 24 formed in a pin shape are formed between a pair of parallel side plates 23A and 23B of a chassis 23 formed in a U-shape. The liquid crystal panel 7 is horizontally fixed to the support members 24 via a pair of fasteners 25.
The support member 24 provided on the pair of side plates 23A and 23B
The hole 26 through which the end is inserted is formed with high precision in order to determine the mounting accuracy and mounting angle of the liquid crystal panel 7. The liquid crystal panel 7 is fixed to the frame 27. At the top and bottom of one surface of the frame 27, each stopper 25 is fixed by a set screw 28. An engagement portion 25a curved in an arc shape is integrally provided at one end of each stopper 25, and the support member 24 is sandwiched between the engagement portion 25a and the incident surface 7a of the liquid crystal panel 7 to thereby form the liquid crystal panel. 7 is attached to a pair of support members 24. As described above, when the incident surface 7a of the liquid crystal panel 7 is directly brought into contact with the pair of support members 24, the liquid crystal panel 7 can be attached to the support members 24 in a predetermined position without any adjustment. The mounting position and the mounting angle of the liquid crystal panel 7 can be accurately determined. Note that the other liquid crystal panels 12, 15, the dichroic mirrors 13, 17 and the total reflection mirror 16, which constitute the imaging optical element 22, are also mounted in the same manner as the liquid crystal panel 7 described above. However, in the above-described conventional liquid crystal color projection apparatus, two support members 24 are required to position and fix one imaging optical element. There was a problem that the score increased. The present invention has been made to solve the above-mentioned conventional problems, and an object of the present invention is to provide an image forming optical element in a liquid crystal color projector or the like capable of reducing the number of parts. It is to provide an attachment method. [0012] In order to achieve the above object, the present invention provides a first and second positioning devices each having a pair on one side surface of a frame provided with an imaging optical element and a stopper. The sub-plate on which the hole is formed is temporarily fixed with a plurality of setscrews, and the frame is inserted between a pair of side plates facing each other parallel to each other through an opening formed on one side plate of the chassis. The sub-plate is in close contact with the outer surface of the one side plate, and a first positioning pin is inserted through a sub-plate positioning hole formed in the pair of side plates and the first positioning hole provided in the sub-plate. After positioning the sub-plate with respect to the side plate, the sub-plate is fixed to one side plate with a plurality of set screws, and then an element positioning hole provided in the other side plate of the chassis, Inserting the second positioning pin into the second positioning hole provided in the plate and the engaging portion of the stopper, thereby positioning the imaging optical element with respect to the chassis and the sub-plate; Is fixed to the other side plate and the sub-plate with a plurality of set screws, and then the first positioning pin is removed from the sub-plate positioning hole and the first positioning hole, and the second positioning pin is removed. It is characterized in that it is removed from the element positioning hole, the second positioning hole, and the engaging portion of the stopper. In the present invention, the first and second positioning pins are used as jigs to position the liquid crystal panel and the sub-plate with respect to the chassis, and then are removed from the chassis and the sub-plate. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail based on an embodiment shown in the drawings. FIG. 1 is a partially cutaway perspective view showing a mounting structure of a liquid crystal panel mounted by the mounting method according to the present invention, FIG. 2 is a side view of the mounting structure shown partially broken away, and FIG. It is a front view. In this embodiment, an example in which the present invention is applied to a liquid crystal color projection device will be described. The same components as those described in the section of the related art are denoted by the same reference numerals, and the description thereof will be omitted. In these figures, the chassis 23 is formed in a U-shaped cross section so that a pair of side plates 23A and 23B opposed
A, 23B and a bottom plate 23C connecting the lower ends thereof. One side plate 23 of the pair of side plates 23A and 23B
An opening 40 for inserting the liquid crystal panel 7 between both side plates, a pair of sub-plate positioning holes 41a and 41b, and screw holes 42a and 42b are formed in a portion corresponding to the liquid crystal panel 7 in FIG. I have. These sub-plate positioning holes 41a, 41b and screw holes 42a,
Reference numeral 42b is for positioning and fixing a sub-plate 46, which will be described later, and is formed along one side edge of the opening 40. The other side plate 23B has a pair of sub-plate positioning holes 43a, 43b, element positioning holes 44a, 44b, and screw mounting holes 45a, 4 respectively.
5b are formed. The sub-plate positioning holes 43a and 43b and the sub-plate positioning holes 41a and 41b of the one side plate 23A are formed with high precision so that their centers coincide. Element positioning hole 4
The 4a, 44b and the screw mounting holes 45a, 45b are formed on the right side of the sub-plate positioning holes 43a, 43b in FIG. The element positioning holes 44a and 44b are provided to the right of the screw mounting holes 45a and 45b. The liquid crystal panel 7 is fixed together with a pair of upper and lower stoppers 25 to one surface of a frame 27 formed in a flat plate shape. Frame body 27 facing one side plate 23A
On one side surface, the sub plate 46 is provided with a pair of set screws 4.
7. The sub-plate 46 is formed larger than the opening 40, and has a heat-dissipating hole 48 formed at the center as shown in FIG. 3, a pair of first positioning holes 49a and 49b, and a second positioning hole. 5
0a, 50b and screw mounting holes 51a, 51b, 52
a, 52b. First positioning holes 49a, 4
9b is the sub-plate positioning holes 41a, 41b,
43a and 43b, the second positioning holes 50a and 50b are formed with high precision so as to correspond to the element positioning holes 44a and 44b, respectively. A pair of screw mounting holes 51
a, 51b are screw holes 42a,
42b. The pair of screw mounting holes 52a and 52b are formed on one side surface of the frame 27 and correspond to screw holes (not shown) into which the set screws 47 are screwed. The sub-plate 46 is provided with the screw holes 42a, 4 through the screw mounting holes 51a, 51b.
2b is fixed to an outer surface of the one side plate 23A by a set screw 53 screwed into the opening 4b.
0 is covered. The side surface of the frame 27 opposite to the sub plate 46 side is in close contact with the inner surface of the other side plate 23B,
Further, it is fixed by a set screw 54 screwed into a screw hole (not shown) from the screw mounting holes 45a and 45b. The screw mounting holes 45a, 45b, 51a, 51b, 52
a and 52b are formed large to enable fine adjustment of the frame 27, in other words, the vertical and longitudinal directions of the liquid crystal panel 7. Next, a method of mounting the liquid crystal panel 7 will be described with reference to FIG.
This will be described in detail with reference to FIG. First, the liquid crystal panel 7 and a pair of stoppers 25 are fixed to the frame 27. The incident surface of the liquid crystal panel 7, that is, the surface 7a on which light from the light source is incident
Protrudes from the surface of the frame 27 by a predetermined dimension, and upper and lower ends thereof are opposed to the engaging portions 25 a of the stopper 25. next,
The sub plate 46 is temporarily fixed to one side surface of the frame 27 with a pair of set screws 47. In this temporarily fixed state, the frame 27 and the sub-plate 46 can relatively move within the range of the gap provided between the screw 47 and the screw mounting holes 52a, 52. Next, the frame 27 to which the sub-plate 46 is temporarily fixed is inserted between the pair of side plates 23A and 23B from the opening 40 so that the insertion side surface of the frame 27 abuts on the inner surface of the other side plate 23B. Then, the sub-plate 46 is moved to one side plate 23.
A covers the opening 40 in close contact with the outer surface of A. Next, in this state, the first holes 41a, 41b, 43a, 43b for positioning the sub-plates of the pair of side plates 23A, 23B and the first positioning holes 49a, 49b of the sub-plate 46 are firstly inserted.
When the positioning pins 55a and 55b are inserted,
The sub plate 46 is positioned vertically and vertically with respect to the pair of positioning pins, that is, the chassis 23. Then, the set screw 53 is screwed into the screw mounting holes 51a, 51b.
And screwed into the screw holes 42a and 42b.
6 is fixed to one side plate 23A. Next, the element positioning holes 44a and 44b of the other side plate 23B, the engaging portion 25a of the stopper 25 and the second positioning holes 50a and 50b of the sub plate 46 are provided.
Then, the second positioning pins 56a, 56b are inserted, and the incident surface 7a of the liquid crystal panel 7 is moved to the second positioning pins 56a, 5b.
The liquid crystal panel 7 is positioned with respect to the pair of positioning pins, that is, the chassis 23 by pressing the liquid crystal panel 7 against the peripheral surface of the liquid crystal panel 6b. Then, the sub-plate 46 is fixed to the frame 27 by tightening the set screw 47, and the frame 27 is fixed to the other side plate 23B by a pair of set screws 54. The first and second positioning pins 55a,
55b, 56a, and 56b may have different outer diameters or may have the same outer diameter. Thereafter, the first positioning pin 55
a and 55b are extracted from the sub-plate positioning holes 41a, 41b, 43a and 43b of the pair of side plates 23A and 23B and the first positioning holes 49a and 49b of the sub-plate 46, and the second positioning pins 56a and 56 are provided.
b to the element positioning holes 44a, 44 of the other side plate 23B.
b, second positioning holes 50a, 50 in sub-plate 46
The mounting operation of the liquid crystal panel 7 is completed by extracting the liquid crystal panel 7 from the engaging portion 25a of the stopper 25 and the stopper 25. As described above, in the mounting method according to the present invention, the liquid crystal panel 7 is attached to the second positioning pins 56a and 56b.
Since the light incident surface 7a only needs to be brought into contact, the mounting and adjustment work of the liquid crystal panel 7 is easy, and the liquid crystal panel 7 can be positioned and fixed to the second positioning pins 56a and 56b with high precision. it can. Further, since the first and second positioning pins 55a, 55b, 56a, 56b are used as jigs and are removed after positioning and fixing the liquid crystal panel 7, the mounting structure of the liquid crystal panel 7 is simple, and the number of parts can be reduced. Can be reduced. Further, since the heat dissipation holes 48 are provided in the sub-plate 27, the liquid crystal panel 7 by the fan is provided.
This is advantageous for cooling. In the above-described embodiment, an example in which the present invention is applied to the liquid crystal panel 7 has been described. However, the present invention is not limited to this, and the liquid crystal panel 12 shown in FIG.
The imaging optical elements such as 15, dichroic mirrors 13, 17 and total reflection mirror 16 can be mounted by the same mounting method. Further, in the above-described embodiment, an example in which the present invention is applied to a liquid crystal color projector is shown. However, the present invention can be applied to a black and white liquid crystal projector using one liquid crystal panel. As described above, the method of mounting the imaging optical element in the liquid crystal color projection apparatus and the like according to the present invention employs the method of mounting the imaging optical element and the stopper on one side surface of the frame body. The sub-plate on which the pair of first and second positioning holes are formed is temporarily fixed with a plurality of set screws,
Insert the frame body between a pair of side plates facing each other in parallel from the chassis through an opening formed in one of the side plates, and closely contact the sub-plate with the outer surface of the one side plate. After the first positioning pin is inserted into the formed sub-plate positioning hole and the first positioning hole provided in the sub-plate to position the sub-plate with respect to the side plate, a plurality of the sub-plates are stopped. It is fixed to one side plate by a screw, and then a second positioning hole is provided in the element positioning hole provided in the other side plate of the chassis, the second positioning hole provided in the sub plate, and an engaging portion of the stopper. The imaging optical element is positioned with respect to the chassis and the sub-plate by inserting a pin, and then the frame is attached to the other side plate and the sub-plate. Fixed with pieces of set screws, with pulled out thereafter the first positioning pin from the sub-plate positioning hole and the first positioning hole,
Since the second positioning pin is pulled out from the element positioning hole, the second positioning hole and the engaging portion of the stopper, the mounting and adjustment work of the imaging optical element is easy, and the mounting accuracy is high. It can be mounted at a mounting angle. Further, since the first and second positioning pins are used as jigs and are detached from the chassis after attaching the imaging optical element, the number of parts for attaching the imaging optical element can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially broken perspective view showing a mounting structure of a liquid crystal panel in a liquid crystal color projection device or the like mounted by a mounting method according to the present invention. FIG. 2 is a side view of the mounting structure shown partially broken away. FIG. 3 is a front view of a sub plate. FIG. 4 is a diagram for explaining a mounting method according to the present invention. FIG. 5 is a diagram for explaining a mounting method according to the present invention. FIG. 6 is a schematic view showing a conventional example of a liquid crystal color projection device. FIG. 7 is a partially broken perspective view showing a conventional liquid crystal panel mounting structure. FIG. 8 is a side view of the mounting structure of the panel. [Description of Signs] 1 ... light source, 4, 9, 13, 17 ... dichroic mirror, 7, 12, 15 ... liquid crystal panel, 6, 16
... total reflection mirror, 20 ... screen, 21 ... spectral optical element, 22 ... imaging optical element, 23 ... chassis, 2
3A: One side plate, 23B: The other side plate, 25: Stopper, 25a: Engaging portion, 27: Frame, 41a, 41b: Sub-plate positioning holes, 42a, 42b: Screw holes, 4
3a, 43b: Sub-plate positioning holes, 44a, 4
4b: Element positioning hole, 47, 53, 54: Set screw, 49a, 49b: First positioning hole, 50a, 50
b: second positioning holes, 55a, 55b: first positioning pins, 56a, 56b: second positioning pins.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) G02B 7/00 G02B 27/18 G02F 1/13 505

Claims (1)

(57) [Claim 1] A sub plate having a pair of first and second positioning holes formed on one side surface of a frame provided with an imaging optical element and a stopper. Is temporarily fixed with a plurality of setscrews, and the sub-plate is inserted into an opening formed in one side plate between the pair of side plates facing each other in parallel with each other on the chassis, and the sub-plate is inserted into the one side plate. The first positioning pin is inserted into the sub-plate positioning hole formed in the pair of side plates and the first positioning hole provided in the sub-plate, and the sub-plate is positioned with respect to the side plate. After that, the sub-plate is fixed to one side plate by a plurality of setscrews. Next, an element positioning hole provided in the other side plate of the chassis, and the second positioning hole provided in the sub-plate. And positioning the imaging optical element with respect to the chassis and the sub-plate by inserting a second positioning pin into an engagement portion of the stopper, and then moving the frame to the other side plate and the sub-plate. The first positioning pin is removed from the sub-plate positioning hole and the first positioning hole, and the second positioning pin is removed from the element positioning hole and the second positioning pin.
A method for mounting an imaging optical element in a liquid crystal color projection device or the like, wherein the imaging optical element is extracted from a positioning hole and an engagement portion of the stopper.