JP2010033089A - Optical device and projection type image display device using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an optical device, wherein an increase in working efficiency and cost reduction are attained by making it possible to fix a lens by one component and both of an adjustment component and the lens can be reused and to provide a projection type image display device using the optical device. <P>SOLUTION: The invention relates to the optical device including the lens 19 attached through the adjustment component 45, wherein the adjustment component 45 includes a fitting part for positioning 451 to which one side of the outer circumferential edge of the lens 19 is fitted to be positioned and an elastic fitting part 455 which is elastically fitted to the other side of the outer circumferential edge of the lens 19 whose one side is fitted to the fitting part for positioning 451. The adjustment component 45 composed of a rectangular frame and the fitting part for positioning 451 is provided in two corner parts of one side of the adjustment component 45. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an optical device and a projection display apparatus using the same, and particularly to a technique for fixing a lens to an adjustment component.

  Various lenses such as a condenser lens, a relay lens, and an integrator lens are used in an optical system (optical device) of a projection display apparatus such as a liquid crystal projector. A mechanism for adjusting the lens position in this type of optical device is indispensable, and when the lens is attached to the optical device, it is necessary to use an adjustment component.

  As conventional techniques for attaching and fixing a lens to an adjustment part, there are a technique in which a lens is sandwiched between two plate-like parts and tightened with screws, or a technique in which a lens is welded to a resin-made adjustment part.

Patent Document 1 discloses a condenser lens that is integrally provided with a plurality of positioning pins that are in contact with a liquid crystal display panel and maintain the distance and parallelism with respect to the liquid crystal display panel.
JP-A-6-18832 (G02F 1/13)

  However, in the conventional technique in which the lens is sandwiched between two parts and tightened with screws, the number of parts increases and the number of man-hours increases. In addition, the conventional technology for welding to resin-made adjustment parts requires special equipment for welding, and when replacing the lens, the adjustment parts must be destroyed, and the lens is not damaged. Since it is difficult to remove, the adjustment part and the lens cannot be reused.

  Moreover, although the technique disclosed in Patent Document 1 does not require adjustment, it is for directly positioning the condenser lens in parallel with the liquid crystal display panel, and the application target is very limited. Therefore, if an adjustable lens is targeted, it cannot be applied to the present invention.

  Accordingly, the present invention has been made to solve such a problem, and it is possible to fix the lens with one component, to improve the work efficiency and reduce the cost, and to reuse the adjustment component and the lens. It is an object of the present invention to provide a possible optical device and a projection display apparatus using the same.

  In order to achieve the above-described object, an optical device according to claim 1 of the present application is an optical device including a lens attached via an adjustment component, and the adjustment component has one side of an outer peripheral edge of the lens. A positioning fitting portion that is fitted and positioned, and an elastic fitting portion that fits elastically with the other side of the outer peripheral edge of the lens with the one side fitted to the positioning fitting portion. The adjustment component is formed of a rectangular frame, and the positioning fitting portion is provided at two corners on one side of the adjustment component.

  The optical device according to a second aspect is characterized in that the adjustment component is formed of a resin, and the elastic fitting portion is formed using the elasticity of the resin.

  A projection display apparatus according to a third aspect includes the optical apparatus according to the first or second aspect, wherein the light emitted from the light source is modulated based on a video signal, and the modulated video light is enlarged and projected. It is characterized by doing.

  According to the optical device of the present application, the lens can be fixed with one component, so that the working efficiency is increased and the cost is reduced, and no special equipment such as welding is required. Reusable.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view showing a liquid crystal projector which is an embodiment of a projection display apparatus according to the present invention, and FIG. 2 is a perspective view showing the upper case removed.

  As shown in FIG. 1, a main body case 2 that forms the outline of the liquid crystal projector 1 includes an upper case 2a and a lower case 2b. When the upper case 2a is removed, the inside appears as shown in FIG.

  A projection window 4 through which the projection lens 3 is exposed is formed at the center of the front surface of the main body case 2. A maintenance opening 5 is formed at the center of the upper surface, and a lid 6 that can be opened and closed is provided in the maintenance opening 5. A projection lens removal button 7 that is operated when removing the projection lens 3 is exposed on the front side of the maintenance opening 5, and an operation display unit 8 is provided on the left side. Further, a cooling vent 9 is formed on the right rear side surface. In addition, leg portions 10 and 10 that are height-adjustable are provided on both side ends of the bottom front end portion.

As shown in FIG. 2, a light source device 11 is disposed in the right rear portion when viewed from the front side, and an optical system 12 extending from the light source device 11 to the projection lens 3 is disposed in the main body case 2. Yes. In the vicinity of the light source device 11, cooling fans 13 and 13 for cooling the light source device 11 and other required cooling parts are provided facing the vent hole 9 shown in FIG. FIG. 3 is a diagram illustrating a configuration example of the optical system 12. The optical system 12 is not limited to that shown in FIG. 3, and the present invention can be applied to various optical systems.

  In FIG. 3, the white light from the light source device 11 passes through the first integrator lens 14, the diaphragm mechanism 15, the second integrator lens 16, the slit plate 17, the polarization beam splitter 18, the condenser lens (condensing lens) 19, and the like. It is guided to the first dichroic mirror 20.

  The first integrator lens 14 and the second integrator lens 16 are composed of heat-resistant glass fly-eye lenses formed by arranging a plurality of cells in a matrix, and uniformize the illuminance distribution of white light emitted from the light source device 11. It has a function. The slit plate 17 is made of an aluminum thin plate and has a function of blocking unnecessary incident light to the polarization beam splitter 18. The polarization beam splitter 18 has one of the P wave and S wave of light. It has a function of extracting only component waves.

  The light passing through the polarization beam splitter 18 passes through the condenser lens 19 and reaches the first dichroic mirror 20. The first dichroic mirror 20 has a function of reflecting only the blue component of light and passing the red and green components, and the second dichroic mirror 21 reflects the green component of light and allows the red component to pass. It has a function. Therefore, the white light emitted from the light source device 11 is split into blue light, green light and red light by the first and second dichroic mirrors 20 and 21. The blue light reflected by the first dichroic mirror 20 is reflected by the field mirror 22, the green light reflected by the second dichroic mirror 21 remains unchanged, and the red light that has passed through the second dichroic mirror 21 is reflected by the field mirrors 23 and 24. The light is reflected and guided to the video generation device 30.

  The image generating device 30 attaches the red liquid crystal panel 33r, the green liquid crystal panel 33g, and the blue liquid crystal panel 33b to the three side surfaces of the cubic color combining prism 31 via the polarizing plates 32r, 32g, and 33b, respectively. Configured. On the light incident side of the three liquid crystal panels 33r, 33g, and 33b, optical compensators 34r, 34g, and 34b for blocking the incidence of unnecessary light component waves on the liquid crystal panels 33r, 33g, and 33b, and polarization are respectively provided. Plates 35r, 35g, and 35b are arranged.

  Accordingly, the blue light reflected by the first dichroic mirror 20 and the field mirror 22 is guided to the blue incident side polarizing plate 35b, and the incident side polarizing plate 35b, the blue optical compensation plate 34b, and the blue liquid crystal panel. 33b and the blue output side polarizing plate 32b, etc., to the color synthesis prism 31. The green light reflected by the second dichroic mirror 21 is guided to the green incident side polarizing plate 35g, and the incident side polarizing plate 35g, the green optical compensator 34g, the green liquid crystal panel 33g, and the green light. The light combining prism 31 is passed through the output side polarizing plate 32g. Similarly, red light transmitted through the first dichroic mirror 20 and the second dichroic mirror 21 and reflected by the two field mirrors 23 and 24 is guided to the incident-side polarizing plate 35r for red, and the incident-side polarized light. The color composition prism 31 is reached through the plate 35r, the red optical compensation plate 34r, the red liquid crystal panel 33r, and the red emission side polarizing plate 32r.

  The three colors of image light guided to the color combining prism 31 are combined by the color combining prism 31 and the color image light obtained thereby is enlarged and projected onto the front screen through the projection lens 3.

  The color synthesizing prism 31, the liquid crystal panels 33r, 33g, and 33b for each color, and the output side polarizing plates 32r, 32g, and 32b are detachable as a unitary prism assembly 36 (see FIGS. 6 and 7). In addition, the incident side polarizing plates 35r, 35g, and 35b and the optical compensators 34r, 34g, and 34b are configured to be detachable individually. The prism assembly 36, the incident side polarizing plates 35r, 35g, 35b and the optical compensators 34r, 34g, 34b can be maintained by opening the lid 6 of the maintenance opening 5 as shown in FIG. .

  5A and 5B are diagrams showing the configuration and operation of the main part of the light source device 11 according to the present embodiment. FIG. 5A is a perspective view of the front opening as seen from the right side, FIG. The flow of cooling air is shown.

  The light source device 11 according to the present embodiment includes an arc tube 110 made of a high-pressure mercury lamp or the like, and a reflector 111 that is disposed so as to cover the arc tube 110 and has a parabolic reflection surface formed on the inner surface and an open front surface. And a heat-resistant glass plate (transparent member) 112 that closes the front opening 111a of the reflector 111. The substantially spherical portion on the base side of the arc tube 110 is a light emitting portion 110a that has a discharge electrode and emits discharge light.

  As shown in FIG. 5 (a), the reflector 111 is previously formed with notches 111b to 111e for ventilation at equal intervals (90 ° intervals) on the top, bottom, left and right of the front opening edge. In the present embodiment, the notch 111d on the left side of the front opening edge of the reflector 111 is used as the intake port 113, while the notch 111e on the opposite surface (right side) facing the intake port 113 is closed, Notches 111b and 111c on both side surfaces (upper and lower surfaces) serve as exhaust ports 114 and 114, respectively.

  In this way, by providing the cooling air exhaust ports 114 and 114 at two positions approximately 90 ° apart from the air intake port 113, the cooling air flowing from the air intake port 113 to the tip of the arc tube 110 as indicated by the arrow a1 is obtained. Since the notch part 111e and the front opening 111a on the opposing surface side are closed by hitting the opposing surface, it passes through the light emitting part 110a of the arc tube 110 toward the back as indicated by the arrow a2, and is indicated by the arrow a3. Thus, the cooling air uniformly cools the periphery of the arc tube 110 without stagnation in the reflector 111. With this configuration, the interior of the reflector 111 can be uniformly cooled even when the light source device 11 is installed at an arbitrary angle at a low cost.

  As described above, the cooling air is circulated throughout the reflector 111 of the light source device 11 without stagnation, thereby facilitating the temperature adjustment of the arc tube 110 and the tip of the arc tube 110, the light emitting unit 110a, and the reflector. Since the cooling effect in the vicinity of the opening 111a can be obtained, the light source device 11 can be installed at an arbitrary angle, and there is no restriction on the installation angle of the liquid crystal projector 1 at low cost.

  In addition, since the exhaust ports 114 and 114 are disposed at approximately 90 ° on both sides from the intake port 113, the exhaust ports 114 and 114 are located at the intermediate portions on both sides of the intake port 113 and its opposite surface. The effect of circulating through the whole without being stagnated in 111 becomes larger.

  In the present embodiment, the exhaust ports 114 and 114 are arranged at approximately 90 ° on both sides from the intake port 113 as described above. However, by providing the exhaust ports 114 and 114 on both side surfaces, a certain amount can be obtained. The effect can be expected.

  6 to 9 are diagrams showing the mounting configuration of the prism assembly part 36 described above. FIG. 6 is an exploded perspective view seen from diagonally above, FIG. 7 is an exploded perspective view seen from diagonally below, and FIG. FIG. 9 is an enlarged view of a main part of the main part, showing a state where the main part is shown.

  The prism assembly 36 is protruded inward from the base portion 40 having a built-in projection lens moving mechanism through an attachment screw 363 through a screw through hole 362 of a leg portion 361 protruding in three directions from a base 360 at the bottom thereof. It is fixed to the female thread portion 411 of the mounting portion 41 with screws.

  On the mounting portion 41, a pair of engagement pieces 413 are erected at predetermined intervals from an elastic member 412 such as a leaf spring. Each of the engagement pieces 413 is formed with a hemispherical convex portion 414 protruding outward.

  On the other hand, the bottom surface side of the base 360 of the prism assembly 36 is hollow, and an engagement hole 365 is formed in the opposing inner wall for elastically engaging the convex portion 414 of each of the engagement pieces 413. Yes.

  Here, the pair of engaging pieces 413 and 413 on the mounting portion 41 side are erected in accordance with the interval of the inner wall in which the engaging hole 365 on the base 360 side of the prism assembly 36 is formed, The prism assembly 36 has elasticity so that it can be attached and detached when a force larger than its own weight is applied to the prism assembly 36.

  Furthermore, the attachment screw 363 is formed with a male screw portion 364 that is screwed into the female screw portion 411 on the attachment portion 41 side only at the tip portion. Further, the screw through hole 362 on the prism assembly part 36 side is formed to have a smaller diameter than the male screw portion 364 of the mounting screw 363, and a female screw portion (not shown) through which the male screw portion 364 can be screwed is formed. Has been.

  In the above configuration, when the prism assembly part 36 is attached, when the base 360 of the prism assembly part 36 is pushed in to a predetermined position of the attachment part 41, the engagement piece of the attachment part 41 as shown in FIGS. The convex portion 414 of 413 is in a state of being temporarily fixed by elastically engaging with the engagement hole 365 on the base 360 side. In this state, when the attachment screw 363 passed through the screw through hole 362 on the prism assembly part 36 side is tightened to the female screw part 411 on the attachment part 41 side, the prism assembly part 36 is fixed to the attachment part 41.

  On the other hand, when the prism assembly 36 is to be removed when the liquid crystal projector 1 is installed upside down by 180 ° in a suspended state, the lid 6 of the maintenance opening 5 is opened as shown in FIG. Then, the mounting screw 363 of the prism assembly 36 is turned with a screwdriver to remove it from the female screw portion 411 of the mounting portion 41. Even if all the mounting screws 363 are removed without holding the prism assembly part 36 by hand, the prism assembly part 36 is temporarily fixed by the engagement piece 413 having elasticity larger than its own weight and does not fall. When all the mounting screws 363 of the prism assembly part 36 are removed, the prism assembly part 36 can be easily detached by pulling by hand. Therefore, the prism assembly 36 can be easily replaced while the liquid crystal projector 1 is suspended from the ceiling, and the work efficiency during maintenance is greatly improved.

  Furthermore, even if the mounting screw 363 is removed from the female screw portion 411 of the mounting portion 41 with a screwdriver, it does not come off from the screw through hole 362 of the prism assembly part 36, so that it does not take time to remove the mounting screw 363 from the driver. Since the next mounting screw 363 can be removed, the working efficiency is further improved.

  Further, by applying the above-described technique to the prism assembly 36 formed by integrating the liquid crystal panels 33r, 33g, and 33b for each of the RGB colors and the output-side polarizing plates 32r, 32g, and 32b with the color combining prism 31, the apparatus can be obtained. There is a great effect that parts can be easily replaced without falling and falling while installed on the ceiling.

  In addition, by configuring the liquid crystal projector 1 as described above, it is possible to easily replace parts while the apparatus is suspended from the ceiling, and it is possible to realize the liquid crystal projector 1 with greatly improved work efficiency during maintenance.

  In the present embodiment, the engaging piece 413 having elasticity is formed on the mounting portion 41 side, and the engaging hole 365 for engaging the convex portion 414 of the engaging piece 413 is formed on the prism assembly component 36 side. In other words, the opposite effect is possible. In short, if an engaging portion having elasticity is formed on at least one of them, the same effect as described above can be obtained.

  10 to 13 are diagrams showing the mounting configuration of the above-described incident-side polarizing plates 35r, 35g, and 35b and the optical compensators 34r, 34g, and 34b. FIG. 10 is an exploded perspective view seen from obliquely above, and FIG. FIG. 12 is a side view of the adjustment component 42 to which the incident-side polarizing plates 35r, 35g, and 35b and the optical compensation plates 34r, 34g, and 34b are attached, and FIG. Here, the green incident side polarizing plate 35g and the optical compensation plate 34g will be described as an example, but the same applies to the other red and blue ones.

  As shown in FIG. 10, the incident-side polarizing plate 35g and the optical compensation plate 34g are respectively attached to adjustment parts 42 and 42 formed in a substantially disc shape with resin, and both side edges thereof are on the attachment portion 43 side. It is inserted into mounting grooves 431 and 431 formed on both side walls, and an adjustment component stopper 44 is screwed onto a female screw portion 432 on the upper surface of the mounting portion 43 with a mounting screw 441 from above. A handle piece 421 is formed at the top of each adjustment component 42, 42, and the adjustment component stopper 44 has a slot 442 for exposing the top of each adjustment component 42, 42 and the handle piece 421, and a handle piece for the adjustment component stopper 44. 443 is formed.

  Further, in the present embodiment, engagement pieces 422 and 422 are formed at the center of both side edges of the substantially disc-shaped adjustment component 42 by slightly bending one side and utilizing the elasticity of the resin. The engagement pieces 422 and 422 have elasticity so that they can be attached and detached when a force larger than their own weight is applied to the adjustment component 42 holding the incident-side polarizing plate 35g and the optical polarizing plate 34g. Further, the bent side surfaces of these engaging pieces 422 are formed in a substantially arc shape as shown in FIGS. 12 and 13 so as not to be caught when inserted into the mounting groove 431 of the mounting portion 43. Yes.

  In the above configuration, when the adjustment component 42 to which the incident side polarizing plates 35r, 35g, 35b and the optical compensation plates 34r, 34g, 34b are attached is inserted, the adjustment component 42 is inserted into the corresponding mounting groove 431 of the attachment portion 43. When the engagement piece 422 is pushed against the elasticity of the engagement piece 422, the engagement piece 422 is elastically engaged with the mounting groove 431 of the attachment portion 43 like the adjustment part 42 holding the polarizing plate 35g shown in FIG. Will be temporarily stopped. Further, the adjustment component 42 holding the optical compensation plate 34g is similarly mounted in the other mounting groove 431. In this state, the adjustment component stopper 44 is inserted into the elongated hole 442 and the handle pieces 421 of the two adjustment components 42 are inserted. When the mounting screw 441 is tightened to the female screw portion 432 on the mounting portion 43 side after being set on the upper surface of the mounting portion 43 so as to pass therethrough, the adjustment components 42 and 42 holding the incident-side polarizing plate 35g and the optical compensation plate 34g are obtained. It is fixed to the mounting portion 43.

  On the other hand, when the liquid crystal projector 1 is installed in a state where it is vertically inverted by 180 ° in the ceiling state, the adjustment component 42 to which the incident side polarizing plates 35r, 35g, 35b and the optical compensators 34r, 34g, 34b are attached is provided. When removing, the lid 6 of the maintenance opening 5 is opened as shown in FIG. 4, and the attachment screw 441 of the adjustment component stopper 44 is removed with a screwdriver. Since the adjustment component stopper 44 is attached with one mounting screw 441, it can be easily removed by holding the handle piece 443. Even if the adjustment component stopper 44 is removed, the adjustment component 42 holding the incident polarizing plate 35g and the optical compensation plate 34g is temporarily fixed by the engagement piece 422 having elasticity larger than its own weight, and does not fall. When the adjustment part stopper 44 is removed, it can be easily removed by pulling the handle piece 421 of the adjustment part 42 by hand. Therefore, the incident side polarizing plates 35r, 35g, and 35b and the optical compensators 34r, 34g, and 34b can be easily replaced while the liquid crystal projector 1 is suspended from the ceiling without losing the adjustment function, and the work efficiency during maintenance can be improved. Greatly improved.

  In addition, the flat plate-shaped resin adjustment component 42 to which the incident-side polarizing plates 35r, 35g, and 35b and the optical compensation plates 34r, 34g, and 34b are attached is used in the mounting groove 431 of the mounting portion 43 by using the elasticity of the resin. By forming the engagement pieces 422 that are in pressure contact, the maintainability of the incident-side polarizing plates 35r, 35g, and 35b and the optical compensators 34r, 34g, and 34b is greatly improved at low cost.

  By configuring the liquid crystal projector 1 as described above, it is possible to easily replace parts while the apparatus is suspended from the ceiling, and it is possible to realize the liquid crystal projector 1 with greatly improved work efficiency during maintenance.

  In the present embodiment, the case where the above-described technique is applied to the incident-side polarizing plates 35r, 35g, and 35b and the optical compensators 34r, 34g, and 34b has been described. However, any optical component that is attached via an adjustment component may be used. It can be applied to other optical components.

  FIGS. 14A, 14B, and 14C are diagrams showing the configuration and operation of the adjustment component to which the lens is fixed. Here, the condenser lens 19 shown in FIG. 3 will be described as an example.

  For the adjustment part 45 of the rectangular frame formed of resin, positioning is performed by fitting both ends of one side (lower side in the figure) of the outer periphery of the condenser lens 19 to the two lower corners. Fitting portions 451 and 451 are formed. These positioning fitting portions 451 are configured by a wall portion 452 on the back side and a claw portion 453 on the front surface side. Further, only the front-side claw portion 454 is formed at an intermediate portion between the positioning fitting portions 451.

  On the other hand, the upper two corners of the adjustment component 45 are elastically fitted to the upper end portions of the outer peripheral edge of the condenser lens 19 whose lower side is fitted to the positioning fitting portion 451 with elasticity. Portions 455 and 455 are formed. These elastic fitting portions 455 are erected on the frame body 45 and bent in a substantially U shape on the inner side, and claw portions 456 are formed on the inner piece that is elastically deformed.

  In the above configuration, when the condenser lens 19 is attached to the adjustment component 45, first, as shown in FIG. 14A, one side (lower side) of the condenser lens 19 is fitted for positioning on the lower side of the adjustment component 45. It is sandwiched between the wall part 452 and the claw part 453 of the parts 451 and 451. Then, as shown in FIG. 14B, the other side (upper side) of the condenser lens 19 is pushed into the elastic fitting portions 455 and 455 on the upper side of the adjustment component 45.

  As a result, both upper end portions of the condenser lens 19 are fitted into the claw portions 456 of the elastic fitting portion 455 as shown in FIG. 14C, tension is applied in the direction of the arrow, and the condenser lens 19 is completely Positioning is fixed.

  On the other hand, when removing the condenser lens 19 from the adjustment component 45, the two elastic fitting portions 455 are elastically deformed outward and the fitting state between the claw portion 456 and the condenser lens 19 is released, so that the condenser lens 19 is easily removed. be able to.

  As described above, since the lens can be fixed with one component, the number of components is small, so that the working efficiency can be increased and the cost can be reduced. Furthermore, a dedicated capital investment such as welding for fixing the lens is not required. Further, both the adjustment component 45 and the condenser lens 19 can be reused.

  Further, since the adjustment component 45 is formed of resin and the elastic fitting portion 455 is formed using the elasticity of the resin, further cost reduction can be realized.

  By constructing the liquid crystal projector 1 using the above-described technology, the working efficiency is increased and the cost is reduced, and no special equipment such as welding is required, and both the adjustment component 45 and the condenser lens 19 are used. The liquid crystal projector 1 that can be reused can be realized.

  The lens is not limited to the condenser lens 19 and can be applied to various lenses as long as the lens is fixed to the adjustment component. For example, although not shown in the optical system of FIG. 3, a relay lens is generally used to adjust the difference in the optical path lengths of RGB colors. However, since this relay lens is also fixedly attached to an adjustment component, the above-described technique is used. Is applicable.

  FIG. 15 is an exploded perspective view showing a housing configuration of the optical system.

  The optical system 12 according to the present embodiment is housed in an optical system housing portion 46 having an upper surface opening formed of a heat-resistant resin with less heat shrinkage, and the upper surface opening of the optical system housing portion 46 housing the optical system 12 is an upper lid 47. It is supposed to be covered.

  Conventionally, the entire upper lid 47 is made of heat-resistant resin, but in this embodiment, a sheet metal upper lid 471 is used at a high-temperature portion close to the light source position, and the heat-resistant resin is not used at a low-temperature portion somewhat away from the light source position. A resin upper lid 472 having elasticity is used. Specifically, since the upper portion of the first integrator lens 14 shown in FIG. 3 is covered with a sheet metal upper lid 471, a small area is sufficient as shown in FIG.

  The dimensional tolerances of the optical components housed in the optical system housing portion 46 are absorbed by simple spring structure portions 473 and 474 formed by cutting out a part of the sheet metal upper lid 471 and the resin upper lid 472. It is configured.

  As described above, by using a sheet metal upper lid 471 for the high temperature portion of the optical system 12 and a resin upper lid 472 for the low temperature portion, the dimensional tolerances of the optical components can be absorbed by each elasticity and surely fixed. become.

  This eliminates the need for a separate part for fixing the optical part, thereby reducing the number of parts and man-hours. Further, since no expensive heat-resistant resin is used for the upper lid 47, a significant cost reduction can be realized.

  In addition, the dimensional tolerance of the optical components housed in the optical system housing portion 46 can be absorbed by simple spring structure portions 473 and 474 formed by cutting out part of the sheet metal upper lid 471 and the resin upper lid 472. It can be easily realized.

  FIG. 16 is a diagram showing the configuration and operation of the projection lens removing device, and FIG. 17 is an exploded perspective view showing the projection lens mounting mechanism.

  The mounting mechanism of the projection lens 3 shown in FIG. 17 is the same as the conventional one. The projection lens 3 is fixed by a pin that restrains the rotation of the projection lens 3 mounted in a screwed manner, like an interchangeable lens of a camera. A push button 48 for releasing the rotation constraint of the projection lens 3 by the fixing pin is provided above the mounting portion 49 of the projection lens 3. The projection lens removing device 50 of the present embodiment shown in FIG. 16 is attached above the projection lens 3 in the vicinity of the push button 48 as shown in FIG.

  As shown in FIG. 16, the projection lens removing device 50 of this embodiment surrounds the projection lens removing button 7 whose upper surface is exposed from the upper surface of the main body case 1 as shown in FIG. It has a frame 51 and an elastic body 52 made of a coil spring that biases the projection lens removal button 7 upward. The projection lens removal button 7 is provided with a substantially cylindrical sliding member 71 protruding on both sides. On the other hand, the frame 51 includes a first inclined surface 511 on which one side of the sliding member 71 of the projection lens removal button 7 slides, and a second inclined surface 512 on which the other side of the sliding member 71 slides. As shown in FIG. 17, a pressing member 513 that presses a push button 48 provided on the upper portion of the mounting portion 49 of the projection lens 3 is provided. Here, a driven mechanism is constituted by the frame 51 and its first inclined surface 511 with respect to the sliding member 71, and a backward movement mechanism is constituted by the elastic body 52 and the second inclined surface 512 of the frame 51. ing.

  In the above configuration, when the projection lens removal button 7 exposed on the upper surface of the main body case 1 is operated and moves downward as shown in FIG. 16B, the sliding member 71 provided on the projection lens removal button 7 is a frame. It is possible to slide the first inclined surface 511 provided in 51, move the frame body 51 in a direction crossing the moving direction of the projection lens removal button 7, and press the push button 48 by the pressing member 513. Become. Thereby, the rotation restriction by the fixing pin of the projection lens 3 attached to the projection lens attachment portion 49 is released, and the projection lens 3 can be rotated and removed.

  Further, after the projection lens 3 is detached, the projection lens removal button 7 is automatically set to the initial position by the restoring force of the elastic body 52 installed at the lower part of the projection lens removal button 7 as shown in FIG. At the same time, the frame 51 can be automatically moved back by sliding with the second inclined surface 512 of the sliding member 71.

  As a result, the projection lens removal button 7 can be installed in a direction that intersects with the moving direction of the push button 48, so that there are fewer restrictions on the installation surface of the projection lens removal button 7. Accordingly, since the projection lens removal button 7 can be installed so as to be exposed on the upper surface of the main body case 1, the liquid crystal projector 1 with improved operability of the projection lens removal button 7 can be realized.

  Further, after the projection lens removal button 7 is operated, the projection lens removal button 7 and the frame 51 can be automatically returned to their original positions. Accordingly, it is possible to follow in the intersecting direction with a small number of parts, and to perform a reliable return of the mechanism.

  If the push button 48 has a sufficient restoring force, the returning mechanism as described above can be omitted by using the restoring force.

  FIG. 18 is a perspective view showing a main configuration of the projection lens moving device.

  The projection lens moving device 53 includes an up / down direction moving member 531, a left / right direction moving member 532, a driving mechanism (not shown), and a control mechanism described later. The projection lens 3 is attached to the left / right moving member 532 and moves in the left / right direction when the left / right moving member 532 is driven, and moves in the left / right direction together with the up / down moving member 531 when the up / down moving member 531 is driven. The member 532 moves up and down, and the projection lens 3 moves up and down.

  Each moving member 531, 532 is formed with a movement amount limiting shaped through-hole 533, 534 communicating with each other, and separation type photo interrupters 54, 54 are arranged at openings on both sides thereof. Since the horizontal movement member 532 moves independently in the horizontal direction, the vertical movement member 531 is formed with a horizontally long through hole 533.

  FIG. 19 is a block diagram showing a control mechanism of the projection lens moving device 53. The microcomputer 55 constituting the control means moves up and down based on the operation display unit 8 and the input from the photo interrupter 54 described above. The motor 56 and the left / right movement motor 57 are controlled. The microcomputer 55 detects that the moving members 531 and 532 have moved and blocked the light based on the output from the photo interrupter 54 and determines that the moving limit has been reached. When the movement amount is small, an ordinary U-shaped photo interrupter may be used instead of the separation type photo interrupters 54 and 54.

  20 and 21 are flowcharts showing an example of control of movement amount restriction.

  In the control example of the flowchart shown in FIG. 20, firstly, input of a lens shift signal from the operation display unit 8 is waited (NO loop of step S11), and if there is input of a lens shift signal, it corresponds to the input lens shift signal. The drive motor 56 or 57 is driven and controlled in the corresponding direction (YES in step S11 → step S12).

  After that, it waits for the signal from the photo interrupter 54 to be turned off (NO loop in step S13), and when the photo interrupter signal is turned off, the light is blocked by the moving member 531 or 532, and thus moves. It is determined that the limit has been exceeded, and the moving motor 56 or 57 that has been driven is stopped (YES in step S13 → step S14). Then, the moving motor 56 or 57 is reversely controlled for a predetermined time to return to within the movement amount limit, and the next lens shift signal is input (NO loop from step S15 to step S11).

  On the other hand, in the control example of the flowchart shown in FIG. 21, similarly to the above, the lens shift signal is first input after waiting for the lens shift signal input from the operation display unit 8 (NO loop in step S <b> 21). The driving motor 56 or 57 corresponding to the lens shift signal is drive-controlled in the corresponding direction (YES in step S21 → step S22).

  After that, it waits for the signal from the photo interrupter 54 to be turned off (NO loop in step S23), and when the photo interrupter signal is turned off, the light is blocked by the moving member 531 or 532, and thus moves. It is determined that the limit has been exceeded, and the moving motor 56 or 57 that has been driven is stopped (YES in step S23 → step S24). Then, after waiting for the input of the lens shift signal in the reverse direction (NO loop of step S25), if there is an input of the lens shift signal in the reverse direction, the process returns to step S22 to control the movement motor 56 or 57. Perform (Step S25 → Step S22). In this control example, the reverse control for a predetermined time as in step 15 of the control example is not performed. Therefore, when the movement limit is exceeded, only the lens shift signal in the reverse direction (return direction) is accepted in step S25. Yes.

  As described above, in the present embodiment, the amount of movement in the vertical and horizontal directions can be limited by the pair of photo interrupters 54 and 54, and thus the cost can be reduced. In addition, since the movement amount can be limited only by a member that moves the projection lens 3 without using other components, the movement amount can be precisely controlled. Further, the amount of movement in any shape other than a square can be limited by the shape of the through holes 533 and 534 opened in the projection lens moving members 531 and 532.

  In the above embodiment, a liquid crystal projector using a liquid crystal panel as a light modulation element is shown as a projection image display device. However, a projection image including another image light generation system other than the invention requiring a liquid crystal panel. The present invention can also be applied to a display device. For example, the present invention can also be applied to a projector using a DLP (Digital Light Processing; registered trademark of Texas Instruments (TI)) system.

The perspective view which shows the liquid crystal projector which is one Embodiment of the projection type video display apparatus concerning this invention. The perspective view which removed and showed the case on it. The figure which shows the structural example of an optical system. The principal part perspective view which shows the state which open | released the cover body of the opening for a maintenance. The figure which shows the principal part structure and effect | action of the light source device in this embodiment. It is a figure which shows the attachment structure of the prism assembly components in this embodiment, and is the exploded perspective view seen from diagonally upward. The disassembled perspective view similarly seen from diagonally downward. The principal part longitudinal cross-sectional view which shows the state similarly attached. Similarly the principal part enlarged view. It is a figure which shows the attachment structure of the incident side polarizing plate and optical compensation board in this embodiment, and is the exploded perspective view seen from diagonally upward. Similarly the principal part top view. The side view of the adjustment component to which the incident side polarizing plate and the optical compensator were similarly attached. Similarly the principal part enlarged view. The figure which shows the structure and effect | action of an adjustment component to which a lens is fixed in this embodiment. The disassembled perspective view which shows the housing structure of the optical system in this embodiment. The figure which shows the structure and effect | action of the projection lens removal apparatus in this embodiment. The disassembled perspective view which similarly shows the attachment mechanism of a projection lens. The perspective view which shows the principal part structure of the projection lens moving apparatus in this embodiment. The block diagram which similarly shows the control mechanism of a projection lens moving apparatus. The flowchart which similarly shows the example of control of movement amount restriction | limiting. The flowchart which shows the other control example of movement amount restriction | limiting similarly.

DESCRIPTION OF SYMBOLS 1 Liquid crystal projector 2 Main body case 2a Upper case 2b Lower case 3 Projection lens 5 Maintenance opening 6 Cover body 7 Projection lens removal button 71 Sliding member 8 Operation display part 9 Vent 11 Light source device 110 Light emitting tube 110a Light emission part 111 Reflector 111a Front opening 111b to 111e Notch 112 Glass plate 113 Intake port 114 Exhaust port 12 Optical system 13 Cooling fan 14 First integrator lens 16 Second integrator lens 18 Polarizing beam splitter 19 Condenser lens 20 First dichroic mirror 21 Second dichroic mirror 22, 23, 24 Field mirror 30 Image generation device 31 Color synthesis prism 32r, 32g, 32b Output side polarizing plate 33r, 33g, 33b Liquid crystal panel 34r, 34g, 34b Optical Compensation plate 35r, 35g, 35b Incident side polarizing plate 36 Prism assembly component 360 Base 361 Leg 362 Screw through hole 363 Mounting screw 364 Male screw portion 365 Engagement hole 40 Base portion 41 Mounting portion 411 Female screw portion 412 Elastic member 413 Engagement piece 414 Convex part 42 Adjustment part 421 Handle piece 422 Engagement piece 43 Attachment part 431 Mounting groove 432 Female thread part 44 Adjustment part stopper 441 Attachment screw 442 Long hole 443 Handle piece 45 Adjustment part 451 Positioning fitting part 452 Wall part 453, 454 Claw portion 455 Elastic fitting portion 456 Claw portion 46 Optical system storage portion 47 Upper lid 471 Sheet metal upper lid 472 Resin upper lid 473, 474 Spring structure portion 48 Push button 49 Projection lens attachment portion 50 Projection lens removal device 51 Frame body 511 First inclined surface 512 Second inclined surface Surface 513 Pressing member 52 Elastic body 53 Projection lens moving device 531 Vertical movement member 532 Horizontal movement member 533, 534 Through hole 54, 54 Separation type photo interrupter 55 Microcomputer 56 Vertical movement motor 57 Horizontal movement motor

Claims (3)

In an optical device with a lens attached via an adjustment component,
The adjusting component is elastic with the other side of the outer peripheral edge of the lens, the positioning fitting part being fitted and positioned on one side of the outer peripheral edge of the lens, and the one side fitted into the positioning fitting part. The adjustment part is formed of a rectangular frame, and the positioning fitting part is provided at two corners on one side of the adjustment part. An optical device comprising: The optical device according to claim 1, wherein the adjustment component is formed of a resin, and the elastic fitting portion is formed using elasticity of the resin. A projection-type image display device comprising the optical device according to claim 1 or 2, wherein the light emitted from the light source is modulated based on a video signal, and the modulated video light is enlarged and projected.