JP2010054610A - Diaphragm device for projector - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a low-cost and highly durable diaphragm device for a projector which uses common two diaphragm members rotated, like double doors, in opposite directions simultaneously by electromagnetic actuators. <P>SOLUTION: The diaphragm member 16 is rotatably attached to shaft members 8 and 12 via integral mediating members 20 and 21, and the diaphragm member 17 that is common to the diaphragm member 16 is rotatably attached to shaft members 9 and 13 via integral mediating members 18 and 19. The electromagnetic actuators AC1 and AC2 are attached to a plate part 1a so that output pins 33b and 25c integrated with rotors penetrate the inner surface side of the plate part 1a, and are inserted in slots formed on the mediating members 20 and 18 and slots formed on attaching pieces 16e and 17e of the diaphragm members 16 and 17, and rotate the diaphragm members 16 and 17 by rotating the rotors in the opposite directions simultaneously. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a diaphragm device for controlling the light amount of a light source of a projector that projects an image or a character on a transmissive or reflective screen.

  Recently, projectors equipped with liquid crystal panels, DMDs (digital micromirror devices), etc. have appeared and are used for various presentations and sales presentations as well as equipment for rear projection TVs. And as this kind of projector, in order to change the illumination light quantity from the light source lamp corresponding to the brightness of the room to project, or to temporarily weaken the illumination light when nothing is projected, The following patent does not change the amount of light emitted from the light source lamp, but controls the amount of light from the light source by changing the optical path area of the light source light with a diaphragm arranged in the vicinity of the light source lamp. Documents 1, 2, and 3 describe.

  Also, particularly in a liquid crystal projector, if the illumination light is temporarily weakened by the diaphragm device when nothing is projected, the deterioration of the liquid crystal panel can be prevented, which is advantageous in terms of durability. It has been known. Patent Documents 1 and 2 also describe that it is possible to obtain a high-contrast image by providing such a diaphragm device and changing the light amount of the light source light. Furthermore, in the case of an overhead projector using a variable magnification optical system as the projection optical system, it is possible to suitably obtain a projected image at a high magnification by arranging an aperture device between the stage for placing the document and the light source. Is described in Patent Document 3 below.

  As a basic configuration of this type of projector diaphragm device, as described in Patent Document 3, two plate-like diaphragm members are slidably moved in opposite directions on substantially the same plane. The optical path size is changed, and as described in Patent Documents 1 and 2, two diaphragm members are rotated in opposite directions to change the size of the optical path. There is something like that. Further, among the latter, two diaphragm members are driven by one electromagnetic actuator, described in Patent Documents 1 and 2, and those individually driven by two electromagnetic actuators are Patent Document 1. However, when the two diaphragm members are individually driven by two electromagnetic actuators, an interlocking mechanism for the two diaphragm members is not necessary, and quietness can be ensured. In addition to this, there is an advantage that an electromagnetic actuator having a small driving force can be used. The present invention relates to a double-aperture type projector diaphragm device in which two diaphragm members are individually driven by two electromagnetic actuators.

JP 2004-69966 A JP 2008-145949 A JP-A-8-227102

  In a double-aperture type projector diaphragm device in which the two diaphragm members are individually driven by two electromagnetic actuators, the two electromagnetic actuators are arranged on both sides with an optical path in between in terms of layout design in the projector. As described in Patent Document 1, the rotation axes of the rotors are parallel to each other and substantially perpendicular to the optical path, as described in Patent Document 1. It is advantageous to arrange and allow the throttle member to reciprocate on an axis that is coaxial or parallel to the axis of rotation of the rotor. When the diaphragm device is configured as a unit with such an arrangement, two diaphragm members are rotatably attached to one surface of the base substrate (surface on the optical path side in the projector), and the opposite side. It is preferable that two electromagnetic actuators are attached to the surface, and the output portions of the electromagnetic actuators are configured to rotate the two throttle members individually.

  However, if one end of the diaphragm member is attached to the base and the other end with the light-shielding plate in between is a free end, the other end side is covered during operation when the diaphragm member is thinned. There is a problem that a large load is applied to the vicinity of the optical path, and the optical path control of a predetermined size cannot be performed due to deformation or the like. Further, in order to avoid such a situation, if it is attempted to make the diaphragm member thicker and more robust, it becomes difficult to process the diaphragm member or an electromagnetic actuator having a large driving force is required. Furthermore, the two electromagnetic actuators can be a common part, but the two diaphragm members minimize the rotation angle and the area of the light shielding plate if the other end of the diaphragm member is a free end. In addition, it is difficult to make common parts, and particularly, as described in Patent Document 2, when the size of the optical path is reduced, the vicinity of the optical axis is formed by the aperture opening forming edges of the two aperture members. When it is desired to form an optical path only with a region, it becomes impossible to make a common component at all.

  The present invention has been made to solve such problems, and the object of the present invention is that two diaphragm members are rotatably attached to the surface of the base on the optical path side in the projector, Two electromagnetic actuators are mounted on the surface of the base opposite to the optical path side so that the rotation axes of the rotors are perpendicular to each other, and these electromagnetic actuators simultaneously move the two diaphragm members in opposite directions. A low-cost, low-cost diaphragm that can be rotated in a double-spreading manner, without compromising the compactness of the device, allowing the two diaphragm members to be used as a common component and smoothly reciprocatingly rotated with an electromagnetic actuator with a small driving force. It is an object to provide an aperture device for a projector that is excellent in efficiency and durability.

  In order to achieve the above object, a projector diaphragm device according to the present invention has a first plate-like shape that has a first surface and a second surface and is disposed with the first surface facing the optical path of the light source light. And the first plate-like portion are parallel to the optical axis of the light source light on the second surface, and a base having a second plate-like portion disposed opposite to each other with the optical path of the light source light therebetween The rotary shafts of the respective rotors are attached to the first plate-like portion so as to be perpendicular to the second surface at positions on both sides of the nearest line, and reciprocate within a predetermined angle range around the rotary shafts. Each of the operated output pins protrudes perpendicularly to the first surface side, the first electromagnetic actuator and the second electromagnetic actuator, and the light shielding plate portion between the light shielding plate portion and the light shielding plate portion. The two mounting pieces are formed in the same manner so that the two mounting pieces face each other. An attachment hole having the same shape as the elongated hole is formed, and one attachment piece is rotatably attached to the first surface through the attachment hole, and the other attachment piece is attached to the second plate-like portion by the attachment hole. A first diaphragm member that is rotatably attached to the elongated hole of the one attachment piece and is reciprocally rotated by an output pin of the first electromagnetic actuator, and has the same shape as the first diaphragm member An attachment piece corresponding to the other attachment piece is rotatably attached to the first surface by the attachment hole, and an attachment piece corresponding to the one attachment piece is attached to the second plate-like portion by the attachment hole. A direction that opposes the first throttle member at the same time by an output pin of the second electromagnetic actuator that is rotatably mounted and fitted in the elongated hole of the mounting piece corresponding to the other mounting piece. A second diaphragm member by a light shielding plate portion of being reciprocally rotated with its light shielding plate portion and the first diaphragm member changing the size of the optical path of the source light, so that has a.

  In this case, the two electromagnetic actuators are configured such that each of the rotation axes is relatively displaced in the length direction of the line on both sides of the nearest line that is parallel to the optical axis on the second surface. The two diaphragm members are arranged in the length direction of the lines on both sides of the closest line parallel to the optical axis on the first surface. If they are mounted so as to be relatively shifted with the same shift amount as the shift amount between the two rotating shafts, the optical path can be shielded by the two diaphragm members. Further, in this case, the two aperture members are formed with aperture opening forming edges, and the optical path in the vicinity of the optical axis can be formed by the two aperture opening forming edges. When the light quantity is reduced by reducing the value, a suitable light distribution state can be obtained.

  Further, in the projector diaphragm of the present invention, the two diaphragm members are made of metal, and the four attachment pieces are integrated with synthetic resin mediating members each having a long hole, The output pin of the first electromagnetic actuator is fitted in the elongated hole of the mediating member integrated with the one attachment piece of the first throttle member, and the output pin of the second electromagnetic actuator Is fitted to the elongated hole of the mediating member integrated with the mounting piece of the second throttle member corresponding to the other mounting piece of the first throttle member, the output Even if the pin is made of a synthetic resin, the diaphragm member can be made of a thin plate material, which is advantageous for reducing the weight of the diaphragm member and durability of the apparatus.

  In that case, each of the mediating members is integrated so as to overlap the mounting pieces of the two throttle members, and the mounting pieces correspond to the long holes of the mediating members. A hole larger than each of the long holes may be formed so as not to contact each of the output pins. Each of the mediating members is formed with an attachment hole smaller than each of the attachment holes so as to overlap the attachment holes formed in the attachment pieces of the two throttle members. The two throttle members may be rotatably attached to the base body by the attachment holes of the mediation members. Further, each of the mediating members is formed with a cylindrical portion that fits into each of the mounting holes formed in the mounting pieces of the two throttle members. The cylindrical portion of the member may be rotatably attached to the base body.

  In the projector diaphragm of the present invention, the two electromagnetic actuators mounted with the rotation axis of their rotors perpendicular to one surface of the first plate-like portion of the base are In a double aperture diaphragm device in which two diaphragm members rotatably mounted on the other surface are simultaneously rotated in opposite directions, the base has an optical path between the first plate-like portion and the base. A second plate-like portion arranged so as to face each other is provided, and each of the two diaphragm members has two mounting pieces formed symmetrically with the light shielding plate portion in between, Since the attachment piece is attached to the first plate-like portion and the other attachment piece is attached to the second plate-like portion, the operation of the two throttle members can be stabilized and the durability can be improved. Two restrictors without compromising compactness There is an advantage in that the common parts of the attained cost reduction.

  The best mode for carrying out the present invention will be described with reference to the illustrated embodiments. FIG. 1 is a perspective view showing the control state of the minimum optical path as viewed from the light source side. FIG. 2 is a front view showing the control state of the minimum optical path as viewed from the light source side, and FIG. 3 is a front view showing the control state of the maximum optical path in the same manner as FIG. 4 is a cross-sectional view taken along line AA in FIG. 2 and viewed in the direction of the arrow. FIG. 5 is a cross-sectional view taken along line BB in FIG. 3 and viewed in the direction of the arrow. 6 is a partially enlarged view of FIG. 5, and FIG. 7 is a cross-sectional view of FIG. 6 taken along the line CC and viewed in the direction of the arrow. Further, FIG. 8 is for explaining the configuration of the actuator used in the embodiment, and FIG. 8A is a diagram showing only the actuator in the state shown in FIG. 8 (b) is a bottom view of FIG. 8 (a), and FIG. 8 (c) is a cross-sectional view taken along the line DD of FIG. 8 (b) and viewed in the arrow direction.

  First, the configuration of this embodiment will be described. As shown in FIG. 1, the base of the diaphragm unit of the present embodiment is composed of a first frame member 1 and a second frame member 2 which are both made of metal. Among them, the first frame member 1 has three plate-like parts 1a, 1b, and 1c, and has a U-shape as a whole. As can be seen, a bent piece 1d and a protruding piece 1e are formed at the tip of the plate-like portion 1a, and a threaded hole 1f is formed through the bent piece 1d. In addition, the tip of the plate-like part 1c facing the plate-like part 1a has a notch-like shape formed in a U-shape by one long side edge and two short side edges on both sides thereof. A recess 1g (see FIG. 1) is formed, and a hole 1h (see FIG. 2) is formed in the vicinity thereof.

  On the other hand, the second frame member 2 has a flat plate shape as a whole and is opposed to the plate-like portion 1b, and has two positioning holes 2a and 2b necessary for attachment to the projector body and two penetrating holes. Screw holes 2c and 2d are provided. 1 and 2, a hole 2e for inserting the protruding piece 1e and a long hole 2f for aligning with the screw hole 1f are formed in the vicinity of the lower end of the second frame member 2. is doing. Among them, the hole 2e has a shape close to a rectangle, and the dimension in the length direction is substantially the same as the width of the protruding piece 1e. However, the dimension in the direction perpendicular to the protruding piece 1e is the same as that of the protruding piece 1e. It is considerably larger than the thickness dimension. And the receiving part 2e-1 is formed in the upper edge. The long hole 2f is formed long in the length direction of the second frame member 2, and the dimension in the width direction is substantially the same as the diameter of the screw hole 1f.

  Further, the upper end portion of the second frame member 2 is formed with a protruding piece 2g to be engaged with the concave portion 1g and two bent pieces on both sides thereof, but in FIG. 1 and FIG. Of these two bent pieces, only the bent piece 2h arranged on the light source side is clearly shown. The width dimension of the protruding piece 2g is substantially the same as the length of the edge of the long side of the U-shaped recess 1g, and fits without rattling. Further, as can be seen from FIG. 2, the bent piece 2h is formed with a threaded hole 2i that passes therethrough, and is aligned with the hole 1h formed in the plate-like portion 1c. The diameters of the hole 1h and the screw hole 2i are substantially the same.

  Next, how to attach the first frame member 1 and the second frame member 2 to each other will be described. As is well known, in the case of a part made of a relatively thin plate material such as the first frame member 1 and having a plurality of bent portions, the present embodiment may be implemented even if it is made of a synthetic resin. Even if it is made of metal as in the example, it is difficult to always maintain a predetermined shape at the part stage as in the case of ceramic. That is, depending on how the first frame member 1 is held during handling, the dimension from the tip of the plate-like portion 1a (the right end in FIG. 2) to the concave portion 1g of the plate-like portion 1c may be different from the design value. become. Therefore, if no measures are taken, the first frame member 1 and the second frame member 2 can be obtained as a right-angled parallelogram by the three plate-like portions 1a, 1b, 1c and the second frame member 2. As a result, it becomes difficult to assemble, and as a result, the two throttle members 16 and 17 described later cannot be properly attached to the plate-like portions 1a and 1c, and the throttle members 16 and 17 cannot be smoothly rotated. There is.

  Therefore, in the present embodiment, when the first frame member 1 and the second frame member 2 are assembled to each other, it is devised so that the right-angled parallelogram as described above can be easily obtained without using too much nerve. ing. First, in the present embodiment, the flat surface of the second frame member 2 has a dimension from the position corresponding to the upper surface of the two bent pieces (one is 2h) to the edge of the receiving portion 2e-1 of the hole 2e. The length dimension of the inner surface of the plate-like part 1b, that is, the design standard dimension from the inner surface of the plate-like part 1a to the inner surface of the plate-like part 1c is the same.

  Therefore, when assembling both, first, the hole 1h formed in the plate-like portion 1c of the first frame member 1 and the screw hole 2i formed in the bent piece 2h of the second frame member 2 are positioned. The screws 3 are inserted and screwed in from the hole 1h side. Next, the protruding piece 1 e formed in the plate-like portion 1 a of the first frame member 1 is inserted into the hole 2 e formed in the second frame member 2. At this time, when the protruding piece 1e is inserted so as to spread between the ends of the plate-like portion 1c, a contact state between the protruding piece 1e and the receiving portion 2e-1 may be obtained immediately. In general, it is difficult to obtain a contact state between the protruding piece 1e and the receiving portion 2e-1 simply by being inserted.

  Therefore, in such an inserted state, the second frame member 2 is lowered downward with respect to the bent piece 1d while maintaining the contact between the bent piece 1d of the first frame member 1 and the second frame member 2. To do. In other words, conversely, the bent piece 1 d is raised upward with respect to the second frame member 2. Then, after ensuring that the contact between the protruding piece 1e and the receiving portion 2e-1 is obtained, the screw 4 is inserted from the long hole 2f side and screwed into the screw hole 1f, whereby the mutual assembling work is performed. finish.

  Thus, in the present embodiment, the first frame member 1 and the second frame member 2 can be easily assembled with each other in a desired state. In the projector, the optical path of the light source light is formed from the near side to the back in FIG. Therefore, in FIGS. 2 and 3, the center of the optical path, that is, the optical axis position is marked with +.

  Next, various members attached to the base body configured as described above and the attachment configuration thereof will be described. First, as shown in FIGS. 4 and 5, the inner surface of the plate-like portion 1 a, that is, the surface on the optical path side of the light source light, is located at the center of the optical path indicated by the one-dot chain line (that is, the optical axis). Three stoppers 5, 6, and 7 are attached to the closest positions facing each other and positions on both sides thereof. As can be seen by comparing FIG. 4 and FIG. 5, the plate-like portion 1a is formed with two long holes 1i, 1j having an arc shape over a predetermined angular range as through holes.

  Two shaft members 8 and 9 are erected on the inner surface of the plate-like portion 1a, but the mounting configuration is completely the same. Therefore, the mounting structure will be described in the case of the shaft member 9 shown in FIG. The shaft member 9 has a flange portion 9a at the tip, and a screw hole 9b is formed at the other end on the root side. The shaft member 9 has a small diameter portion 9c formed at the other end fitted in a hole 1k formed in the plate-like portion 1a, and a screw 10 is inserted from the outside of the plate-like portion 1a. It is attached by being screwed to 9b. 2 and 3 show the screw 11 to which the shaft member 8 is attached in the same manner. Further, as shown in FIGS. 2 and 3, two shaft members 12, 13 are formed on the inner surface of the plate-like portion 1c in the same manner as the shaft members 8, 9, with screws 14, 15 is erected. In addition, the shaft member 12 is erected at a position facing the shaft member 8, and the shaft member 13 is erected at a position facing the shaft member 9.

  Next, the diaphragm member 16 rotatably attached to the shaft member 8 and the shaft member 12 and the diaphragm member 17 rotatably attached to the shaft member 9 and the shaft member 13 In the present embodiment, both are made of metal and are the same common parts. Also, as will be described later, the mounting configuration is exactly the same except that the vertical positions are reversed. First, the shape of the throttle member 17 and how to attach it will be described mainly with reference to FIGS. 1, 6, and 7.

  As shown in FIG. 1, the diaphragm member 17 is symmetrical to each other so that the light shielding plate portion 17 a is long in the vertical direction and the upper and lower portions are parallel to the surface of the light shielding plate portion 17 a. The support pieces 17b and 17c formed in a shape, and mounting pieces 17d and 17e formed in symmetrical shapes by being bent from the support pieces 17b and 17c so as to be substantially perpendicular to the surface of the light shielding plate portion 17a. Have. The light shielding plate portion 17a is formed with a stepped aperture opening forming edge 17a-1.

  In this embodiment, the aperture opening forming edge 17a-1 is formed in a staircase shape on the light shielding plate portion 17a. However, the present invention is not limited to such a shape. The light shielding plate portion 17a may be a simple rectangle. Further, the support pieces 17b and 17c may be formed so as to be flush with the light shielding plate portion 17a, or the support pieces 17b and 17c are not formed, and the attachment pieces 17d and 17e are directly formed on the light shielding plate portion 17a. You may make it form from.

  As shown in FIG. 6, the attachment piece 17e is formed with two elongated holes 17f and 17g having the same shape, an attachment hole 17h having a large diameter, and a hole 17i having a small diameter. Although not specifically shown, the other mounting piece 17d has a plane shape symmetrical to that of the mounting piece 17e, and is the same as the portion facing the elongated holes 17f and 17g of the mounting piece 17e. A long hole having a shape is formed, and holes having the same shape are formed at positions facing the holes 17h and 17i of the mounting piece 17e.

  The mounting hole 17 h formed in the throttle member 17 is a hole necessary for rotatably mounting the throttle member 17 to the shaft member 9. Therefore, according to the present invention, the diameter of the mounting hole 17h may be slightly smaller than that in the present embodiment, and may be directly fitted to the shaft member 9. However, in the case of this embodiment, the intermediate member 18 made of synthetic resin is integrally attached to the diaphragm member 17, and the intermediate member 18 is directly attached to the shaft member 9.

  That is, as can be seen from FIGS. 6 and 7, the mediating member 18 includes two long holes 18a and 18b that are slightly smaller than the long holes 17f and 17g, a cylindrical portion 18c, a pin 18d, and a hook portion 18e. And the cylindrical portion 18c is rotatably fitted to the shaft member 9. The throttle member 17 has a cylindrical portion 18c fitted in the mounting hole 17h, a pin 18d is press-fitted into the hole 17i, and is latched by a hook portion 18e. Accordingly, the center positions of the long hole 17f and the long hole 18a, and the long hole 17g and the long hole 18b are made to coincide with each other.

  In the case of the present embodiment, the reason why such a synthetic resin mediating member 18 is provided is to prevent the output pin 25c from being worn and to improve the durability of the throttle device. That is, the diaphragm member 17 is made of a metal having excellent heat resistance because it receives strong light from the light source, and is made of a thin plate material in order to reduce the weight. Therefore, if the long hole 17g of the throttle member 17 is made small and the synthetic resin output pin 25c is directly fitted, the edge of the long hole 17g wears the output pin 25c. This is because the diaphragm member 17 is not smoothly rotated. In addition, since the diaphragm member 17 becomes very hot, if the output pin 25c is directly fitted into the long hole 17g, the thin output pin 25c is likely to be deformed.

  Although the mediating member 18 of the present embodiment is rotatably attached to the shaft member 9, the mediating member of the present invention is not necessarily attached to the shaft member 9 so long as it is integral with the throttle member 17. The mounting hole 17h of the throttle member 17 may be slightly reduced, and only the throttle member 17 may be directly rotatably attached to the shaft member 9 as described above. Further, both the mediating member 18 and the throttle member 17 may be attached so as to be in contact with the shaft member 9. Furthermore, the throttle member 17 of the present embodiment forms a long hole 17g that is slightly larger than the long hole 18b of the mediating member 18. However, the throttle member of the present invention has a shape in which the edge of the long hole 18b escapes. However, it is not always necessary to form a clearance hole slightly larger than the long hole 18b, such as the long hole 17g, and even if it is formed, it is a long hole shape as in this embodiment. It doesn't matter.

  The other attachment piece 17d of the diaphragm member 17 is also attached to the shaft member 13 with the same configuration. Therefore, in FIG.2 and FIG.3, although the mediation member 19 used for the attachment is shown, the code | symbol of a site | part is abbreviate | omitted. Further, as described above, since the configuration of the mounting piece 17e and the mediating member 18 and the mounting configuration thereof with respect to the shaft member 9 have been described in detail with reference to FIGS. 6 and 7, in FIGS. Only representative parts are labeled.

  On the other hand, as described above, the other diaphragm member 16 has the same shape as the diaphragm member 17, and the vertical direction is reversed without changing the direction. 12 is attached. That is, the diaphragm member 16 and the diaphragm member 17 are common parts. Therefore, similarly to the diaphragm member 17, the diaphragm member 16 includes a light shielding plate portion 16a, support pieces 16b and 16c, and attachment pieces 16d and 16e. A stepped aperture opening forming edge 16a-1 is formed in the light shielding plate portion 16a.

  4 and 5 show the shape of the mounting piece 16e. As described above, the diaphragm member 16 is the same as the diaphragm member 17 in the vertical direction without changing the orientation. Therefore, the mounting piece 17e is shown in a symmetrical shape. Further, the mediating member 20 integral with the throttle member 16 has the same shape as the mediating member 18 described above. Further, the mutual integrated configuration of the throttle member 16 and the mediating member 20 and the mounting configuration thereof with respect to the shaft member 8 are substantially the same as those described with reference to FIGS. Therefore, in FIGS. 4 and 5, only the two long holes 20 a and 20 b formed in the mediating member 20 are labeled as in the case of the mediating member 18. Further, the other mounting piece 16d of the diaphragm member 16 is also attached to the shaft member 12 with the same configuration. Therefore, FIGS. 2 and 3 show the intermediate member 21 used for the attachment.

  In this embodiment, as described above, the throttle member 16 is rotatably attached to the shaft members 8 and 12 via the mediating members 20 and 21, and the throttle member 17 is interposed via the mediation members 18 and 19. However, the present invention is not limited to such a configuration, and when it is not necessary to consider the wear of the output pins 33b and 25c, the mediating members 20 and 21 are provided. , 18 and 19, the mounting holes of the mounting pieces 16 e, 16 d, 17 e and 17 d (the mounting holes 17 h in the case of the mounting pieces 17 e) are made small so that the throttle members 16 and 17 are connected to the shaft members 8 and 12. , 9 and 13 may be attached to be rotatable. In such a case, in this embodiment, the elongated holes 17f and 17g formed in the mounting piece e are formed in the same shape as the elongated holes 18a and 18b of the mediating member 18, and the elongated holes thus formed are used. The output pin 25 is fitted to 17f. And it goes without saying that the other two long holes formed in each of the mounting pieces 16e, 16d, and 17d have shapes corresponding to this. Furthermore, in the present embodiment, the attachment pieces 16d, 17d of the diaphragm members 16, 17 are attached to the inner surface of the plate-like portion 1c. However, the present invention is not limited to such a configuration, and is plate-like. You may make it attach to the outer surface of the part 1c.

  Next, the structure of the two electromagnetic actuators AC1 and AC2 for reciprocatingly rotating the diaphragm members 16 and 17 and the structure for attaching the first frame member 1 to the plate-like portion 1a will be described. First, four columns of the same length are erected by caulking on the outer surface of the plate-like portion 1a, that is, the surface opposite to the optical path of the light source light. The two pillars 22 and 23 are clearly shown. And the printed wiring board 24 is attached to the front-end | tip of those pillars, and two electromagnetic actuator AC1, AC2 is between the printed wiring board 24 and the plate-shaped part 1a with respect to the plate-shaped part 1a. Are attached individually. Further, these electromagnetic actuators AC1 and AC2 are common parts as electromagnetic actuators, and the mounting configuration with respect to the plate-like portion 1a is exactly the same. Therefore, in the following, the configuration of the electromagnetic actuator AC2 will be described mainly using FIG.

  FIG. 8A shows the electromagnetic actuator AC2 as seen from a slightly different angular position from the state shown in FIG. 8B is a bottom view of FIG. 8A, and FIG. 8C is a cross-sectional view taken along the line DD of FIG. 8B and viewed in the direction of the arrow. First, the rotor 25 shown in FIG. 8C includes a cylindrical permanent magnet 25a, a rotary shaft 25b integrally formed with the permanent magnet 25a with a synthetic resin material, and an output pin 25c. ing.

  The stator mainly includes a first stator frame 26, a second stator frame 27, a coil 28, and a yoke 29. Among them, the first stator frame 26 has a shape like a flowerpot that covers one cylindrical open end as a whole, and the second stator frame 27 has a plate shape as a whole. ing. In addition, the first stator frame 26 and the second stator frame 27 are in a state in which the output pin 25c of the rotor 25 is passed through an arc-shaped long hole 27a formed in the second stator frame 27. Then, the rotary shaft 25b is supported, and then the coil 28 is wound so as to surround the bearing portions. Thereafter, a cylindrical yoke 29 is fitted into the first stator frame 26.

  Since the coil 28 is composed of two coils, the first stator frame 26 is provided with four terminal pins 26a for attaching the coils, and the Hall element 30 is provided. A recessed groove 26b for attaching the printed wiring board 31 provided therein is formed. The coil 28 and the hall element 30 are electrically connected to the printed wiring board 24 in the attached state to the plate-like portion 1a. Further, in this type of electromagnetic actuator, when the coil 28 is not energized, the stop position of the rotor 25 becomes extremely unstable. Therefore, in order to stabilize the stop position by the magnetic force acting between the permanent magnet 25a, the four magnetic rods 32 are mounted in the four slots 26c of the first stator frame 26. Yes.

  As is well known, this electromagnetic actuator AC2 is a current control type actuator, and when one coil of the coils 28 is energized, the rotor 25 is rotated to one side, and when the other coil is energized, the rotor is rotated. 25 is rotated to the other side. Then, the rotor 25 is stopped at a position where the rotational forces of both are balanced. Further, the rotational position of the rotor 25 is always detected by the Hall element 30, and the current value for the two coils is controlled by the detection signal to rotate the rotor 25 in a predetermined direction or at a predetermined position. It is supposed to be stopped. However, in the current control type electromagnetic actuator, the coil 28 is not two coils as in the present embodiment, but only one, and the rotational position of the rotor 25 is controlled by the Hall element 30 as in the present embodiment. It is also well known that the current value is controlled while detecting and the rotor 25 is stopped at a predetermined position. Therefore, the electromagnetic actuator of the present invention may have such a configuration.

  Next, the attachment structure with respect to the plate-shaped part 1a is demonstrated. As shown in FIG. 8B, the second stator frame 27 is formed with two mounting holes 27b. Further, as shown in FIG. 8A, two positioning pins 27c are formed on the surface on the plate-like portion 1a side. Therefore, after inserting the two positioning pins 27c into positioning holes (not shown) formed in the plate-like portion 1a, two screws (not shown) are inserted into the two mounting holes 27b, and the plate-like portion 1a. And screwed into a screw hole not shown. In the attached state, as shown in FIGS. 6 and 7, the output pin 25 c passes through the long hole 1 j of the plate-like portion 1 a, the long hole 18 a of the mediating member 18, and the throttle member 17. The long hole 17f is inserted into the long hole 18a and comes into contact with the edge of the long hole 18a.

  On the other hand, the other electromagnetic actuator AC1 has the same configuration and is attached to the plate-like portion 1a in the same manner. Therefore, FIGS. 4 and 5 illustrate the rotor 33, the rotation shaft 33a, and the output pin 33b of the electromagnetic actuator AC1, and FIGS. 2 and 3 illustrate the output pin 33b. . 4 and 5, the output pin 33b of the electromagnetic actuator AC1 also penetrates the long hole 1i of the plate-like portion 1a, and the long hole 20a of the mediating member 20 and the throttle member 16 It is inserted into a long hole (no symbol) and comes into contact with the edge of the long hole 20a.

  Therefore, the relationship between the mounting positions of the two electromagnetic actuators AC1 and AC2 with respect to the plate-like portion 1a and the standing positions of the two shaft members 8 and 9 will be described with reference to FIGS. First, the two electromagnetic actuators AC1 and AC2 have their rotation axes 33a and 25b on both sides of the nearest line parallel to the optical axis (dashed line) on the outer surface of the plate-like portion 1a. Although they are equidistant from each other, they are attached so as to be arranged at positions relatively displaced with respect to the length direction of the line.

  On the other hand, the two shaft members 8 and 9 have an operation locus drawn by the rotation shafts 33a and 25b of the electromagnetic actuators AC1 and AC2 and the output pins 33b and 25c within a predetermined angle range (usually around 60 degrees at maximum from the production). Is erected on the inner surface of the plate-like portion 1a at a predetermined position. 4 and 5, the distance between the position of the rotating shaft 33 a and the position of the shaft member 8 is the same as the distance between the position of the rotating shaft 25 b and the position of the shaft member 9. The shaft members 8 and 9 are equidistant from the line on both sides of the nearest line parallel to the optical axis on the inner surface of the plate-like portion 1a, but the length direction of the line. It is attached so that it may be arranged in the position shifted relatively. In addition, although the shaft members 8 and 9 of a present Example are standingly arranged in such a position, this invention is not limited to such a structure, For example, it is concentric with rotating shaft 33a, 25b. It does not matter if it stands upright.

  Further, as described above, the electromagnetic actuators AC1 and AC2 have the same configuration, and the diaphragm members 16 and 17 and the mediating members 20 and 18 are also members having the same shape. Therefore, the interval between the shaft member 8 and the output pin 33b is also the same as the interval between the shaft member 9 and the output pin 25c. In this embodiment, the two electromagnetic actuators AC1 and AC2 are configured such that the rotors 33 and 25 are simultaneously rotated in opposite directions.

  Next, the operation of the present embodiment will be described mainly with reference to FIGS. 2 to 5 in the case where the operation of the present embodiment is adopted in a liquid crystal projector. 2 and 4 show the control state of the minimum optical path in which the two diaphragm members 16 and 17 enter the optical path and the light amount of the light source light is limited to the maximum, that is, the control state of the minimum aperture opening. The diaphragm members 16 and 17 are in contact with the stopper 5. At this time, by energizing the coils of the two electromagnetic actuators AC1 and AC2, the rotor 33 may be rotated counterclockwise and the rotor 25 may be rotated clockwise in FIG. As is well known, the electromagnetic actuators AC1 and AC2 of this embodiment are maintained in the stopped state by the presence of the magnetic rod 32 described with reference to FIG. ing.

  Further, as described above, the relative positions of the two shaft members 8 and 9 are shifted along the line parallel to the optical axis on the surface of the plate-like portion 1a. The light shielding plate portions 16a and 17a of the members 16 and 17 can overlap each other in the upper and lower regions of FIG. 2 without colliding. Thus, in this state, the stepped aperture opening forming edges 16a-1 and 17a-1 can form a minimum optical path centered on the optical axis.

  In the present embodiment, in this way, the optical path with the minimum opening centered on the optical axis can be formed at the center of the stepped aperture opening forming edges 16a-1 and 17a-1. The present invention is not limited to the above configuration. That is, the aperture opening forming edges 16a-1 and 17a-1 are not stepped, and the two can be formed into a shape that provides a substantially rectangular minimum opening as described in Patent Document 2, or a substantially circular or substantially long shape. You may make it the shape which can obtain the circular minimum opening. Alternatively, the two aperture opening forming edges 16a-1 and 17a-1 may be formed in parallel straight lines so as to form an elongated optical path in the vertical direction. However, considering the lens configuration, it is preferable to make the shape close to a circle around the optical axis.

  In addition, when the aperture opening forming edges 16a-1 and 17a-1 are formed in a straight line so as to form an elongated optical path, the relative positions of the two rotating shafts 33 and 25 and the two It is not necessary to configure the relative positions of the shaft members 8 and 9 to be shifted along a line parallel to the optical axis on the surface of the plate-like portion 1a. Further, as in this embodiment, the relative positions of the two rotating shafts 33 and 25 and the relative positions of the two shaft members 8 and 9 are along a line parallel to the optical axis on the surface of the plate-like portion 1a. When configured so as to be shifted, the two diaphragm members 16 and 17 are not brought into contact with the stopper 5 in the minimum optical path control state as in this embodiment, but are brought into contact with the stopper 5 in a state where the optical path is completely shielded. You may make it contact. By doing so, it is possible to suitably prevent deterioration of the liquid crystal panel even if the light source is turned on when not projecting.

  When the optical path is increased from the state shown in FIGS. 4 and 5, the rotor 33 is simultaneously rotated clockwise and the rotor 25 is counterclockwise. Thereby, the aperture member 16 is rotated clockwise by the output pin 33b, and the aperture member 17 is rotated counterclockwise by the output pin 25c. For this reason, the two diaphragm members 16 and 17 increase the optical path formed by the opening restricting edges 16a-1 and 17a-1 of both, and are stopped at a position where an image on the screen can obtain a predetermined contrast. .

  After that, when the contrast of the image on the screen changes during projection in response to changes in the image conditions displayed on the liquid crystal panel, the optical path is increased or decreased accordingly. Become. Therefore, the operation of the throttle members 16 and 17 is required to be quick, but the present embodiment is configured to sufficiently meet such a requirement. This is because the shaft members 8 and 9 that serve as the rotation shafts of the throttle members 16 and 17 exist between the operation shafts of the rotation shafts 33a and 25b and the output pins 33b and 25c. This is because it can be rotated at an angle larger than the rotation angle.

  In addition, the diaphragm members 16 and 17 are rotatably mounted by two mounting pieces 16d, 16e, 17d, and 17e provided on both sides of the light shielding plate portions 16a and 17a. It is not covered during operation. Further, the rotation and stop operations of the throttle members 16 and 17 are frequently performed. In the present embodiment, as described above, the output pins 33b and 25c made of synthetic resin are used for the intermediate members 20 and 18, respectively. Since they are fitted in the long holes 20a, 18a, they are not worn by the thin metal diaphragm members 16, 17, and are not deformed by heat.

  FIGS. 3 and 5 show the control state of the maximum optical path in such a manner that the two diaphragm members 16 and 17 are brought into contact with the stoppers 6 and 7 and stopped.

  The electromagnetic actuators AC1 and AC2 of the present embodiment are current control type electromagnetic actuators as described with reference to FIG. 8, but the electromagnetic actuator of the present invention is not limited to such a configuration, A step motor may be used. In the case of the present embodiment, as described with reference to FIGS. 6 and 7, two long holes (long holes 17f and 17g in the case of the mounting piece 17e) are formed in each mounting piece, and each intermediary is formed. In the member, two long holes (long holes 18a and 18b in the case of the mediating member 18) are formed at positions corresponding to them, but the present invention is not limited to such a shape, and one by one. It does not matter even if it is formed. However, as shown in FIG. 4 and FIG. 5, two of the two intermediate members 20 and 18 are adjacent to each other in the long holes 20a and 18a adjacent to each other. When the output pins 33b and 25c are fitted, the space area occupied by the aperture device in the projector can be reduced.

It is the perspective view of the Example which showed the control state of the minimum optical path seeing from the light source side. It is the front view of the Example which showed the control state of the minimum optical path seeing from the light source side. It is the front view of the Example which showed the control state of the maximum optical path seeing from the light source side. It is sectional drawing which cut | disconnected FIG. 2 by the AA line and looked at the arrow direction. It is sectional drawing which cut | disconnected FIG. 3 by the BB line and looked at the arrow direction. It is the elements on larger scale of FIG. It is sectional drawing which cut | disconnected FIG. 6 by CC line and looked at the arrow direction. FIG. 8A is a diagram showing only the actuator in the state shown in FIG. 3, and FIG. 8B is a diagram for explaining the configuration of the actuator used in the embodiment. FIG. 8A is a bottom view of FIG. 8A, and FIG. 8C is a cross-sectional view taken along the line DD of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 1st frame member 1a, 1b, 1c Plate-shaped part 1d, 2h Bending piece 1e, 2g Projection piece 1f, 2c, 2d, 2i, 9b Screw hole 1g Recessed part 1h, 1k, 2e, 17i Hole 1i, 1j, 2f , 17f, 17g, 18a, 18b, 20a, 20b, 27a Long hole 2 Second frame member 2a, 2b Positioning hole 2e-1 Receiving part 3, 4, 10, 11, 14, 15 Screw 5, 6, 7 Stopper 8 9, 12, 13 Shaft member 9a Flange portion 9c Small diameter portion 16, 17 Diaphragm member 16a, 17a Light shielding plate portion 16a-1, 17a-1 Diaphragm opening forming edge 16b, 16c, 17b, 17c Support piece 16d, 16e, 17d 17e Mounting piece 17h Mounting hole 18, 19, 20, 21 Intermediate member 18c Tube portion 18d Pin 18e Hook portion AC1, AC2 Electromagnetic actuator 22 23 Pillar 24, 31 Printed wiring board 25, 33 Rotor 25a Permanent magnet 25b, 33a Rotating shaft 25c, 33b Output pin 26 First stator frame 26a Terminal pin 26b Concave groove 26c Groove hole 27 Second stator frame 27b Mounting hole 27c Locating pin 28 Coil 29 Yoke 30 Hall element 32 Magnetic rod

Claims (7)

  The first plate-like portion, which has a first surface and a second surface and is arranged with the first surface facing the optical path of the light source light, and the first plate-like portion sandwich the optical path of the light source light. The rotating shafts of the respective rotors are positioned on both sides of the base body having the second plate-like portion disposed opposite to each other and the closest line parallel to the optical axis of the light source light on the second surface. Each output pin that is attached to the first plate-like portion so as to be perpendicular to the surface and is reciprocated within a predetermined angular range around the rotation shaft protrudes perpendicularly to the first surface side. The first electromagnetic actuator and the second electromagnetic actuator, the light shielding plate portion, and two attachment pieces formed at substantially right angles to the light shielding plate portion with the light shielding plate portion interposed therebetween. One piece is formed with a long hole with the same shape and a mounting hole with the same shape so as to face each other. The attachment hole is rotatably attached to the first surface, and the other attachment piece is rotatably attached to the second plate-like portion by the attachment hole, and is fitted into the elongated hole of the one attachment piece. Further, a first diaphragm member that is reciprocally rotated by an output pin of the first electromagnetic actuator, and an attachment piece that has the same shape as the first diaphragm member and corresponds to the other attachment piece are formed by the attachment holes. An attachment piece that is rotatably attached to a surface and corresponds to the one attachment piece is rotatably attached to the second plate-like portion through the attachment hole, and the elongated hole of the attachment piece that corresponds to the other attachment piece At the same time, the output pin of the second electromagnetic actuator fitted into the shaft is reciprocally rotated in a direction opposite to the first diaphragm member, and the light shielding plate portion and the light shielding plate portion of the first diaphragm member Projector throttle device, characterized in that it comprises a second diaphragm member to vary the size of the optical path of the source light I.   The two electromagnetic actuators are attached such that each of the rotation axes is relatively displaced in the length direction of the line on both sides of the closest line parallel to the optical axis on the second surface. The two diaphragm members are arranged in the length direction of the two lines on the both sides of the closest line parallel to the optical axis on the first surface. 2. The aperture device for a projector according to claim 1, wherein the projector diaphragm device is mounted so as to be relatively displaced with the same displacement amount as the displacement amount between the two rotating shafts.   An aperture opening forming edge is formed in the two aperture members, and an optical path in a region near the optical axis can be formed by the two aperture opening forming edges. Item 3. The projector aperture device according to Item 1 or 2.   The two diaphragm members are made of metal, and the four mounting pieces are integrated with synthetic resin mediating members each having a long hole, and the output pin of the first electromagnetic actuator is The intermediate member integrated with the one attachment piece of the first throttle member is fitted in the elongated hole, and the output pin of the second electromagnetic actuator is connected to the other of the first throttle member. 4. The projector according to claim 1, wherein the projector is fitted in the elongated hole of the mediating member integrated with the mounting piece of the second diaphragm member corresponding to the mounting piece. 5. Throttle device.   The mediating members are integrated so as to overlap the mounting pieces of the two throttle members, and the mounting pieces correspond to the long holes of the mediating members, 5. The aperture device for a projector according to claim 4, wherein a hole larger than each of the long holes is formed so as not to contact the output pin.   Each intermediary member is formed with a mounting hole smaller than each mounting hole at a position overlapping with each mounting hole formed in each mounting piece of the two throttle members. 6. The aperture device for a projector according to claim 4, wherein the member is rotatably attached to the base by the attachment holes of the mediating members.   Each of the mediating members is formed with a cylindrical portion that fits into each of the mounting holes formed in each of the mounting pieces of the two throttle members, and the two throttle members are connected to each of the mediating members. 6. The projector diaphragm device according to claim 4, wherein the projector is rotatably attached to the base body by the cylindrical portion.

Images