JP2006047685A - Projector apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projector apparatus which can simply secure the contrast in the projected image. <P>SOLUTION: The aperture plate 33 has a light shading plane 33a displaced from the optical axis O of the projector lens device 7 to the side to which the DMD reflects the off-light, and an opening 33b corresponding to the reflecting position of the on-light to the projector lens device 7. The on-light contributing to form a projected image effectively passes the opening 33b, and the other light originally not contributing to forming a projected image reflected on the DMD is shaded by the shading plane 33a without fail. Thus, the contrast is simply secured in the image projected on the screen through the projector lens device 7. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projector device including a projection optical system that projects light from a light source onto a screen.

  Conventionally, this type of projector apparatus includes a light source, a light modulation element that modulates light emitted from the light source, and a projection lens apparatus as a projection optical system that projects light modulated by the light modulation element onto a screen. Each is equipped.

  As a light modulation element, there is a projector device using, for example, DMD (Digital Micromirror Device (trade name)).

  This DMD element is provided with a large number of micromirrors in a matrix, and by changing the angle of these micromirrors, so-called on-light that makes light from the light source incident on the projection lens device and off-projection that projects outside the projection lens device. The reflection direction is switched to light, and the light reflected as on-light is projected onto the screen as a projection image via the projection lens device.

  However, in such a projector device, the angle of the micromirror of the DMD element continuously changes between an angle that reflects on-light (on-angle) and an angle that reflects off-light (off-angle). The light reflected at the angular position until the change from the on angle to the off angle or at the angular position until the change from the off angle to the on angle is incident on the projection lens device.

  Specifically, as shown in FIG. 7, the light ML reflected by the micromirror is incident on the approximate center of the projection lens device P as the on-light LN when the micromirror is turned on, and the micromirror is turned off. Is reflected to the outside of the projection lens device P (upper right direction shown in FIG. 7) as off-light LF, and the on-light LN of the on-light LN changes as the micromirror changes from the on-angle toward the off-angle. The projection position continuously changes from the incident position toward the outside of the projection lens device P, which is the position of the off-light LF, as indicated by the broken line, and the reflected light during this time enters the projection lens device P.

  On the other hand, the projected image on the screen is a good projected image with the highest contrast when formed only by the on-light.

  That is, when off-light that does not originally contribute to the formation of the projection image is incident on the projection lens device, the projection image deteriorates, for example, the contrast of the projection image decreases.

  Accordingly, there is a demand for further improvement of the projector apparatus that prevents the light other than the on-light of the DMD element from entering the projection lens when the micromirror is in the on state.

  Therefore, a projector apparatus in which a diaphragm device including a diaphragm plate having a shape in which a light shielding surface portion projects along a portion where the on-light and off-light of the DMD element intersect is provided in the projection lens device. It is known (for example, refer to Patent Document 1).

In addition, the diaphragm device has a contrast characteristic with respect to the incident direction and the incident angle of the liquid crystal panel according to the position where the principal ray of the light emitted from the liquid crystal panel as the light modulation element intersects the optical axis of the projection lens device. There is also known one having a diaphragm plate provided with an opening having a corresponding shape (for example, see Patent Document 2).
Japanese Patent Laying-Open No. 2003-322822 (page 7-10, FIG. 1) JP 2004-157348 A (page 6, FIG. 2)

  However, in the configuration described in Patent Document 1 described above, a part of the ON light necessary for forming the projection image is shielded by the light shielding surface portion of the diaphragm plate, and it is not easy to ensure the contrast of the projection image. Has the problem.

  Moreover, in the structure described in the above-mentioned patent document 2, since the opening part is provided according to the position where the chief ray of the light radiate | emitted from the liquid crystal panel cross | intersects the optical axis of a projection lens apparatus, an opening part is provided. Even if it is shaped according to the contrast characteristics with respect to the incident direction and incident angle of the liquid crystal panel, it is not easy to reliably shield only light that does not contribute to the formation of the projected image, and it is easy to ensure the contrast of the projected image It has the problem that it is not.

  SUMMARY An advantage of some aspects of the invention is that it provides a projector device that can easily ensure the contrast of a projected image.

  The projector device according to claim 1 is disposed between a light source, a projection optical system that projects light from the light source onto a screen, and between the projection optical system and the light source, and turns on the light from the light source. A light modulating means that sometimes reflects to the projection optical system and reflects in a direction different from the on time when turned off, and a side on which light is reflected by the light modulating means with respect to the optical axis of the projection optical system A light-shielding surface portion that is provided in a biased manner and can shield light reflected by the light modulation means other than when it is on, and a reflection position of the light reflected by the light modulation means when it is on to the projection optical system And a light shielding means provided with an opening provided corresponding to the above.

  And the light-shielding surface part displaced to the side where the light is reflected by the light modulation means with respect to the optical axis of the projection optical system, and the reflection position of the light reflected by the light modulation means when the light is turned on to the projection optical system By providing the light shielding means with the opening provided corresponding to the light, the light that is reflected by the light modulation means when it is turned on and contributes to the formation of the projected image efficiently passes through the opening, and the light modulation means Since the light that is reflected except when it is on and does not contribute to the formation of the projected image is surely shielded by the light shielding surface portion, the contrast of the projected image projected onto the screen is easily ensured by the projection optical system.

  According to a second aspect of the present invention, in the projector device according to the first aspect, the light blocking means is displaceable between a side where the light is reflected when the light modulation means is on and a side where the light is reflected when the light modulation means is off. The aperture plate is provided to vary a light shielding amount of light reflected by the light modulation means other than when the light modulation means is turned on according to the displacement, and the aperture reflects light when the light modulation means is turned on by the diaphragm plate. In this state, the optical modulator is notched along the shape of the light reflected when it is turned on.

  Then, the light shielding means is adapted to displace light reflected by the light modulation means other than when the light is reflected when the light modulation means is turned on and between the side where the light is reflected when the light modulation means is turned off. The aperture plate is configured to vary the amount of light shielding, and the aperture is in a state where the aperture plate is most displaced to the side where the light is reflected when the light modulator is turned on, along the shape of the light reflected when the light modulator is turned on. By providing the projection plate, when the diaphragm plate is most displaced to the side where the light is reflected when the light modulation means is on, the light reflected when the light modulation means is off is reliably shielded by the diaphragm plate, and the projection optics The contrast of the projected image projected onto the screen by the system is improved, and when the aperture plate is displaced to the side where the light is reflected by the light modulation means, the light is reflected by the light modulation means when the light is off. Of light reflected when on while The amount is increased, a projection image to be projected to the screen and it is possible to brightly while improving the contrast by the projection optical system.

  According to the present invention, the contrast of the projected image can be easily ensured.

  Hereinafter, the configuration of a projector apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  In FIG. 5, reference numeral 1 denotes a projector device. The projector device 1 includes a lamp 2 as a light source, a color wheel unit 4 including a color wheel 3 that colors light emitted from the lamp 2, and the color wheel unit 4. Illumination optical system 5 that uniformly guides the illuminance of the colored light, and a display element as a light modulation means for modulating the light guided by the illumination optical system 5, that is, a DMD (Digital Micromirror Device (trade name) )) 6, and a projection lens device 7, which is a lens barrel as a projection optical system for projecting the light beam modulated by the DMD 6 onto a screen (not shown). The projector apparatus 1 includes an illumination optical system 5 and a DMD 6 attached to a frame body (not shown) as a main body, and a lamp 2, a color wheel unit 4, a projection lens device 7 and the like in an exterior casing (not shown). Contained.

  In the following, along the optical axis O of the light beam traveling from the lamp 2 to the screen, the screen side is the front side, the lamp 2 side is the rear side, and the left-right direction from the rear side to the front side of the optical axis O is the left-right direction. explain.

  The lamp 2 is an incandescent bulb such as a halogen lamp or a discharge lamp such as a metal halide lamp.

  The color wheel 3 is formed, for example, in a disk shape in which each color filter of red (R), green (G), and blue (B) is provided in an equally divided fan shape, and in a direction substantially orthogonal to the optical axis O. It is arranged along. The color wheel unit 4 moves the color wheel 3 at a constant speed in the circumferential direction so that the red (R), green (G), and blue (B) color filters of the color wheel 3 sequentially strike the light rays of the lamp 2. The light beam emitted from the lamp 2 is rotated and colored in each color in a time-sharing manner.

  The illumination optical system 5 includes a light tube 11 that uniformizes the illuminance of the light beam colored by the color wheel unit 4, a relay lens unit 12 that condenses the light beam that is uniformed by the light tube 11, and the relay lens unit 12. And a cone mirror C2 as a reflector for reflecting the light beam reflected by the flat mirror M1 to the DMD 6.

  The light tube 11 is disposed coaxially with the optical axis O. The light tube 11 irradiates the relay lens unit 12 while making the illuminance of the light colored by the color wheel unit 4 uniform.

  The relay lens unit 12 includes relay lenses L1, L2, and L3 disposed along the optical axis O.

  The flat mirror M1 has a planar reflecting surface, is inclined with respect to the axial direction of the relay lens unit 12, and is disposed so as to reflect light toward the cone-cave mirror M2.

  As shown in FIGS. 1, 2 and 5, the cone-cave mirror M2 is formed in a substantially square shape when viewed from the front, has a conical reflecting surface, and projects so that the reflecting surface faces the DMD 6. It is disposed in the lower left part behind the lens device 7. In other words, the cone cave mirror M2 is disposed between the DMD 6 and the projection lens device 7. Further, the cone-cave mirror M2 is separated from the rear part of the projection lens device 7. The cone-cave mirror M2 is formed with a notch 13 having a rectangular shape in front view, into which the rear part of the projection lens device 7 is fitted, at the corner.

  The DMD 6 is a reflective element that modulates and reflects the light collected by the relay lenses L1, L2, and L3 according to the processed video signal, and processes the video signal. It is mounted on the electronic circuit. Specifically, this DMD 6 has a large number of micromirrors (not shown), that is, micromirrors in a matrix, and these micromirrors are turned on / off, that is, switched, and reflect light to the projection lens device 7 (on light) when turned on. When off, light is reflected in the upper right direction of the optical axis O, which is a direction different from the reflection direction at on (off light). As shown in FIG. 3, the DMD 6 continuously projects the reflected light LR from the position of the on-light LN to the position of the off-light LF when changing from the on-state to the off-state as in the conventional example. Is displaced.

  The projection lens device 7 includes a substantially cylindrical focus ring 15 and a substantially cylindrical zoom ring 16 each holding a plurality of lenses therein, and is attached to the frame body via a lens barrel holding plate 17. .

  The focus ring 15 has a rear portion inserted into the zoom ring 16 and is provided to be rotatable around the optical axis O. Further, a plurality of lenses (not shown) are held inside the focus ring 15 and constitute a first lens group. The focus ring 15 is rotated to move the lens located in the forefront portion back and forth along the optical axis O with respect to the zoom ring 16, thereby performing a focusing operation.

  The zoom ring 16 is provided to be rotatable around the optical axis O independently of the focus ring 15. Further, inside the zoom ring 16, lenses (not shown) are sequentially held from the rear side to the front side in the optical axis direction, and a second lens group is constituted by these lenses, and the second lens group and the focus ring 15 are arranged. 4 constitutes the lens group L shown in FIG.

  Further, as shown in FIGS. 1, 2 and 5, the rear end of the zoom ring 16 is fitted into a notch 13 so that the zoom ring 16 can be moved forward and backward as the zoom ring 16 advances and retracts. The protruding lens barrel portion 18 is coaxially projected. A lens opening 19 which is an opening end of the rear portion of the projection lens device 7 on which the on-light LN is incident is formed at the rear end portion of the protruding lens barrel portion 18, and the second lens is formed from the lens opening portion 19. The lens L4, which is part of the group, is facing. Then, by rotating the zoom ring 16, the first lens group and the second lens group move back and forth along the optical axis direction to change the focal length, and the zoom operation is performed.

  Further, as shown in FIGS. 1 and 2, etc., at the rear part of the zoom ring 16, a diaphragm device 31 for adjusting the amount of light passing through the projection lens device 7, and the diaphragm device 31 are driven to drive the diaphragm device. A diaphragm driving means 32 as a diaphragm plate driving mechanism for changing the amount of light shielded by 31 is provided. That is, the diaphragm device 31 and the diaphragm driving means 32 are disposed between the DMD 6 and the projection lens device 7.

  The aperture device 31 is disposed on the upper right side with respect to the optical axis O. In other words, the diaphragm 31 is disposed so as to be deviated from the optical axis O toward the side where the off-light LF from the DMD 6 is reflected. In addition, the diaphragm device 31 includes a diaphragm plate 33 serving as a light shielding unit located on the rear side in the optical axis direction of the protruding barrel portion 18 of the zoom ring 16, and a cam plate 34 located on the rear side of the lens barrel holding plate 17. And.

  As shown in FIG. 3, the diaphragm plate 33 is disposed so as to face the lens L4 facing the lens opening 19 of the protruding lens barrel 18 and cross the optical axis O, for example, to be orthogonal thereto. Is displaced between the side on which the on-light LN is reflected and the side on which the off-light LF is reflected, so that the amount of light other than the on-light LN reflected by the DMD 6 can be varied. . The diaphragm plate 33 includes a light shielding surface portion 33a that protrudes toward the center side of the zoom ring 16, that is, the optical axis side, an opening 33b that is cut out in the light shielding surface portion 33a, and a lower right portion of the light shielding surface portion 33a. A supported portion 33c extending downward is integrally formed of a metal member, and a black silicone resin paint is baked on the entire surface.

  The light shielding surface portion 33a is located on the upper right side with respect to the optical axis O, and protrudes downward in a convex arc shape. The outer diameter size of the light shielding surface portion 33a is larger than the outer diameter size of the lens L4 facing the diaphragm plate 33, and smaller than the outer diameter size of the protruding barrel portion 18.

  The opening 33b is cut out in a circular arc shape so as to protrude upward at the lower end of the light shielding surface 33a. Further, as shown in FIG. 3A, the opening 33b is in a state where the diaphragm plate 33 is most displaced to the ON light LN side (closed state), that is, the reflection position of the ON light LN, that is, the lens L4. Corresponding to the incident position, it is formed in an arc shape substantially along the outer shape of the on-light LN incident on the lens L4.

  The supported portion 33c protrudes on the right side of the light shielding surface portion 33a and extends in an elongated shape downward. As shown in FIG. 3, the supported portion 33c is located outside the protruding barrel portion 18 of the projection lens device 7 in a front view.

  On the other hand, as shown in FIGS. 1 and 2, the cam plate 34 is formed integrally with a cam plate body 34a and a cam hole 34b formed in the cam plate body 34a.

  The cam plate body 34a is formed in a shape substantially equal to the supported portion 33c of the diaphragm plate 33 when viewed from the front, is separated from the outer peripheral surface of the protruding lens barrel portion 18, and is positioned along the circumferential direction of the protruding lens barrel portion 18. It extends downward.

  The cam hole 34b is formed in an arc shape from the upper left part to the lower right part of the cam plate body 34a. The cam hole 34b is formed so as to approach the right side portion of the cam plate body 34a from the upper side to the lower side.

  The diaphragm plate 33 and the cam plate 34 are integrally connected to each other by connecting arms 35 on the right side of the supported portion 33c and the cam plate main body 34a, and the inside of the hole portion 28 of the lens barrel holding plate 17 The supported portion 33c and the lower end portion of the cam plate main body 34a rotate on a rotation shaft 38a protruding from a support portion 38 protruding horizontally behind the large diameter portion 18a of the protruding barrel portion 18 located at It is pivotally supported, and is urged forward along the optical axis direction by a spring 39 as an urging member.

  The aperture driving means 32 is disposed between the projection lens device 7 and the cone-cave mirror M2, that is, in a space surrounded by the projection lens device 7 and the cone-cave mirror M2. The aperture drive means 32 is connected to the motor 41, the first transmission means 42 driven by the motor 41, and the first transmission means 42, and is movable integrally with the zoom ring 16 along the optical axis direction. The transmission means 44 provided with the second transmission means 43 provided on the side, and the first transmission means 42 are urged in the direction to be connected to the second transmission means 43, and the first transmission means 42 is connected to the second transmission means. Supporting means 45 is provided for supporting displacement in the direction of connection to 43 and the direction of separation from 43.

  The motor 41 pivotally supports a holding body 46 provided in the first transmission means 42 and is fixed to an attachment frame 47 fixed to the frame body, and is disposed on the lower left side with respect to the optical axis O. ing.

  Here, the mounting frame 47 is fixed to the frame body and has a horizontal and longitudinal base plate portion 51 along the left-right direction, and a shaft support plate that is bent upward from the front and rear of the base plate portion 51 and holds the holding body 46 from the front and rear. 52 and 52, and a mounting plate 53 that is bent upward from one end on the left side of the substrate 51 and to which the motor 41 is attached. Further, an insertion hole (not shown) is formed in the mounting plate 53, and the rotation shaft 55 of the motor 41 is inserted through the insertion hole. That is, the motor 41 has the rotation shaft 55 along a direction substantially orthogonal to the optical axis O in plan view. A worm gear WG as drive transmission means is integrally provided at the tip of the rotating shaft 55.

  The worm gear WG is positioned between the shaft support plates 52 and 52 and is rotated integrally with the rotation shaft 55 of the motor 41.

  The first transmission means 42 includes a holding body 46 that is elongated in the left-right direction, a closed-side transmission gear G1 that is a rotating gear as a closed-side transmission unit that is rotatably held by the holding body 46, and a rotary gear A transmission gear G2, an open-side transmission gear G3 that is a rotation gear as an open-side transmission unit, and a transmission gear G4 as a rotation gear are provided, and are attached to the frame body.

  The holding body 46 is formed in a substantially V shape when viewed from the front, and a closed side transmission gear G1 and a transmission gear G2 are pivotally supported on one end side of the longitudinal direction, that is, on the right side, and mesh with each other. The open side transmission gear G3 and the transmission gear G4 are pivotally supported on the other end side of the direction, that is, the left end side, and mesh with each other.

  Therefore, as shown in FIGS. 1 and 2, the closed-side transmission gear G1 has a rotation axis along the optical axis direction, and is biased by the biasing spring 71 as a closed-side transmission unit biasing body in the optical axis direction. It is urged to the front side along. Similarly, the open-side transmission gear G3 has a rotation axis along the optical axis direction, and is urged forward along the optical axis direction by an urging spring 72 as an open-side transmission portion urging body. Yes. Accordingly, the transmission gears G1 and G3 are given frictional force, that is, friction, to the rotation by the biasing springs 71 and 72, respectively.

  Further, the second transmission means 43 is formed in an annular shape, and the inner peripheral portion has a smooth circumferential surface, and the transmission gears G1 and G3 of the transmission means 44 are arranged on the lower half of the outer peripheral portion, respectively. A gear portion 75 that can be selectively meshed is formed in the front-rear direction.

  The second transmission means 43 is configured such that the protruding lens barrel portion 18 of the zoom ring 16 is inserted therein, the front side is positioned by a holding step portion (not shown) provided on the outer peripheral surface of the zoom ring 16, and the protruding lens barrel portion It is possible to rotate smoothly around 18.

  The second transmission means 43 is positioned on the rear side by a pair of pins 78 (only one is shown) attached to the zoom ring 16 so that it does not rattle in the front-rear direction with respect to the zoom ring 16 and is aligned with the optical axis O. It is positioned so as not to incline with respect to it. As a result, the second transmission means 43 has a rotation axis along the optical axis direction, and is provided so as to be movable back and forth along the optical axis direction as the zoom ring 16 moves.

  Further, as shown in FIGS. 1 and 2, etc., protrusions 81 and 82 are respectively formed on the rear side of the upper portion of the second transmission means 43 so as to extend rearward. One pin 78 is located between the projections 81 and 82, and the projection 81, 82 and the pin 78 regulate the amount of rotation of the second transmission means 43 in the rotational direction around the optical axis. Yes. That is, the pin 78 also has a function as a stopper of the second transmission means 43.

  Further, on the outer peripheral surface on the upper side of the second transmission means 43, a cam portion 85 is provided in the vicinity of the protrusion 81, that is, in the upper right portion, along the radial direction. A cam pin 86 that guides or guides the diaphragm plate 33 via the cam plate 34 protrudes forward from the cam portion 85, and the cam pin 86 is inserted into the cam hole 34 b of the cam plate 34.

  As a result, the rotation of the second transmission means 43 causes the cam pin 86 to rotate in the circumferential direction of the second transmission means 43 together with the cam portion 85, so that the cam pin 86 and the cam hole 34b act as shown in FIG. As shown in a) to FIG. 3 (c), the diaphragm plate 33 rotates about the rotation shaft 38a so that the diaphragm device 31 is opened and closed, and the diaphragm amount of the light passing through the projection lens device 7 is adjusted. The

  As shown in FIGS. 1 and 2, the gear portion 75 of the second transmission means 43 is set such that the thickness dimension in the direction along the optical axis O is larger than the moving distance of the zoom ring 16. That is, the gear unit 75 has a gear groove longer than the moving distance of the zoom ring 16. Therefore, the transmission gears G1 and G3 and the second transmission means 43 can mesh with each other over the entire movement range of the zoom ring 16.

  The support means 45 includes both connection gears G5 and a support shaft 88 that rotatably supports the both connection gears G5 together with the holding body 46 with respect to the mounting frame 47.

  Both connection gears G5 are rotatably supported by support shafts 88 inserted through rotation holes (not shown) formed in the support plates 52 and 52 of the holding body 46 and the mounting frame 47, respectively, and the transmission gears G2, It meshes with G4 and worm gear WG respectively. That is, both connection gears G5 have a rotation axis along the optical axis direction.

  Both the connection gears G5 are rotated via the worm gear WG by the rotation of the motor 41, and the transmission gears G1, G3 are rotated by rotating the transmission gears G2, G4 along with the rotation. It is intended to rotate. In other words, the two connection gears G5 are connected to the transmission gears G1 and G3 and rotated by the driving force of the motor 41. Therefore, both the connection gears G5 and the transmission gears G1 and G3 have a relationship between the sun gear and the planetary gear.

  That is, both the connection gears G5 and the holding body 46 are provided so as to freely rotate with respect to the support shaft 88, respectively.

  As shown in FIGS. 1 and 2, the lens barrel holding plate 17 is formed in a substantially square shape when viewed from the front, and has a circular hole portion 28 through which the rear portion of the zoom ring 16 is inserted and protrudes into the frame body. It is drilled in the center. Further, the lens barrel holding plate 17 is provided with screw holes 89 at the four corners, and screws (not shown) are respectively inserted into the screw holes 89 and tightened so that the lens barrel holding plate 17 is attached to the frame body. Fixed.

  Next, the operation of the above embodiment will be described.

  As shown in FIG. 5, the light rays emitted from the lamp 2 become color lights colored red (R), green (G), and blue (B) by the color wheel 3 in a time-sharing manner. After the illuminance is made uniform, the light is condensed by the relay lens unit 12, reflected by the flat mirror M1 to the cone-cave mirror M2, and the light reflected by the cone-cave mirror M2 enters the DMD 6. Further, the color light incident on the DMD 6 is reflected according to the video signal processed by the video signal processing circuit or the like, and only the on-light LN is reflected to the projection lens device 7 and is projected on the screen after being subjected to focus adjustment and zoom adjustment. Is done. At this time, each color light is synthesized as an afterimage by the viewer's vision, so that it is visualized as a color image.

  When adjusting the contrast of the image projected on the screen, when the motor 41 is rotated by an external operation or the like, the worm gear WG rotates together with the rotation of the motor 41, and both connections engaged with the worm gear WG are connected. Gear G5 rotates.

  At this time, when both the connecting gears G5 are rotated in the counterclockwise direction, for example, the two connecting gears G5 and G3 are frictionally applied to the transmission gears G1 and G3 from the biasing springs 71 and 72, respectively. The closed side transmission in which the rotation of the gear G5 acts as a rotational force in the circumferential direction of the support shaft 88 of the holding body 46, the holding body 46 also rotates counterclockwise, and rotates around the connecting gear G5. The gear G1 is connected to the gear portion 75 of the second transmission means 43.

  Then, when the second transmission means 43 is rotated in the clockwise direction by the rotation of the closed transmission gear G1, the cam pin 86 together with the second transmission means 43 is rotated by the second transmission means 43 as shown in FIG. The cam plate 86 rotates in the clockwise direction around the moving shaft, and the diaphragm plate 33 rotates downward around the support portion 38 by the action of the cam pin 86 and the cam hole 34b, thereby closing the diaphragm device 31 and blocking light. As the surface portion 33a advances toward the on-light LN side, the amount of light incident on the lens opening 19 of the protruding lens barrel portion 18 of the projection lens device 7 is sequentially reduced, and the diaphragm plate 33 is moved toward the on-light LN side. In the most displaced state, as shown in FIG. 3A, the on-light LN is incident on the lens opening 19 from the opening 33b, and light other than the on-light LN reflected by the DMD 6 is shielded. Shaded by 33a.

  On the other hand, when both the connecting gears G5 are rotated in the clockwise direction, for example, the holding body 46 is also rotated in the clockwise direction by the same action as that in the case of rotating in the clockwise direction, and around the both connecting gears G5. An open side transmission gear G3 that rotates on a planetary surface is connected to the gear portion 75 of the second transmission means 43.

  Then, when the second transmission means 43 is rotated counterclockwise by the rotation of the open-side transmission gear G3, the cam pin 86 together with the second transmission means 43 is connected to the second transmission means 43 as shown in FIG. It rotates counterclockwise about the optical axis O, which is the rotation axis, and the diaphragm plate 33 rotates upward about the support portion 38 by the action of the cam pin 86 and the cam hole 34b. The amount of light incident on the lens opening 19 of the protruding lens barrel portion 18 of the projection lens device 7 when the device 31 is opened and the light shielding surface portion 33a moves backward to the side where the off-light LF is reflected by the DMD 6. In the state where the diaphragm plate 33 is most displaced to the off-light LF side (closed state), as shown in FIG. 3C, the on-light LN, the on-light LN, and the off-light LF Part of the reflected light LR located between the respective reflection positions enters the lens opening 19 from the opening 33b.

  Further, the second transmission means 43 rotates until the pin 78 comes into contact with one of the protrusions 81 and 82 at the maximum. Here, when the motor 41 continues to rotate in a state in which one of the protrusions 81 and 82 is in contact with the pin 78, that is, in a state where the second transmission means 43 is rotated to the end of the rotation restriction range. Means that the force to rotate the closed transmission gear G1 or the open transmission gear G3 connected to the gear portion 75 of the second transmission means 43 acts as a force to rotate the holding body 46 around the support shaft 88. The holding body 46 is rotated when the closed-side transmission gear G1 connected to the gear portion 75 of the second transmission means 43 or the open-side transmission gear G3 is rebounded away from the gear portion 75 of the second transmission means 43. Move. For this reason, transmission of the driving force of the motor 41 to the second transmission means 43 is blocked.

  Further, while the motor 41 continues to rotate, a force that rotates in the direction of connecting the closed transmission gear G1 or the open transmission gear G3 to the second transmission means 43 acts on the holding body 46. The closed side transmission gear G1 or the open side transmission gear G3 once separated from the gear part 75 of the transmission means 43 is connected to the gear part 75 of the second transmission means 43 again.

  That is, by repeating these actions, the gear portion 75 of the second transmission means 43 and the transmission gears G1 and G3 are repeatedly brought into contact with and separated from each other, and the second transmission means 43 is moved to the end of the rotation restriction range. Even if the motor 41 continues to rotate, excessive force is prevented from being applied between the gear portion 75 of the second transmission means 43 and the transmission gears G1 and G3.

  When the diaphragm plate 33 is stopped, the light other than the on-light LN reflected by the DMD 6, that is, the reflected light LR and the off-light LF are restricted from entering the projection lens device 7, thereby improving the contrast of the projected image. Thus, the projected image is darkened as a whole. Further, when the diaphragm plate 33 is widened, the projected light quantity increases as a whole, and the projected image becomes bright. Therefore, the opening / closing amount of the diaphragm plate 33 is adjusted according to the brightness around the projection image so that the projection image is easy to see.

  As described above, according to the above-described embodiment, by disposing the diaphragm plate 33 between the projection lens device 7 and the DMD 6, light other than the on-light LN reflected by the DMD 6, that is, reflected light. LR, off-light LF, and the like can be reliably shielded by the diaphragm plate 33, so that incidence on the projection lens device 7 can be prevented efficiently and reliably.

  Specifically, the light shielding surface portion 33a of the diaphragm plate 33 is provided so as to be biased toward the off-light LF side reflected by the DMD 6 with respect to the optical axis O of the projection lens device 7, and the DMD 6 is provided on the light shielding surface portion 33a. By providing the opening 33b corresponding to the incident position of the reflected on-light LN to the projection lens device 7, the on-light LN efficiently passes through the opening 33b and the off-light LF is more efficiently transmitted by the light shielding surface 33a. The light is well and surely shielded and can be efficiently prevented from entering the projection lens device 7, and the contrast of the projected image can be easily secured.

  In particular, the diaphragm plate 33 is disposed so as to face the lens opening 19 at the rear of the projection lens device 7, so that the DMD 6 can be compared with the case where the diaphragm plate is provided inside the projection lens device, for example. The light other than the ON light LN reflected by the light can be efficiently blocked by the light shielding surface 33a of the diaphragm plate 33 and incident on the projection lens device 7, and the diaphragm plate 33 is disposed at a position close to the lamp 2. Therefore, by forming the diaphragm plate 33 from a metal member, the heat resistance of the diaphragm plate 33 that is heated by the light from the lamp 2 can be improved, and the black silicone resin paint is applied to the diaphragm plate 33. By baking the coating, deterioration of the coating can be prevented.

  Also, the off-light reflected by the DMD 6 is arranged by disposing the diaphragm plate 33 by displacing the off-light LF reflected by the DMD 6 with respect to the optical axis O of the projection lens device 7. The diaphragm plate 33 can efficiently and surely prevent the LF from entering the projection lens device 7.

  Further, the diaphragm plate 33 can be displaced between the reflection positions of the on-light LN and the off-light LF by the DMD 6, and the amount of light other than the on-light LN reflected by the DMD 6 can be varied with this displacement. Thus, the contrast and brightness of the projected image projected onto the screen by the projection lens device 7 can be selectively adjusted.

  Specifically, the diaphragm plate 33 can be displaced between the reflection positions of the on-light LN and the off-light LF by the DMD 6, and the amount of light other than the on-light LN reflected by the DMD 6 can be reduced with this displacement. An aperture 33b is provided in the variable aperture plate 33 so as to follow the shape of the on-light LN in a state where the aperture plate 33 is most displaced to the on-light LN side, so that the aperture is shown in FIG. In the state where the plate 33 is most displaced to the on-light LN side, the off-light LF that does not originally contribute to the formation of the projected image projected onto the screen by the projection lens device 7 can be reliably shielded, and the contrast of the projected image can be improved. In addition, as shown in FIGS. 3B and 3C, in the state where the diaphragm plate 33 is displaced toward the off-light LF side, the on-light LN is directed to the projection lens device 7 while blocking off-off light LF. The amount of passage increases, and a bright projected image can be obtained while improving the contrast.

  That is, it is possible to adjust whether the projection image is focused on contrast or brightness according to the brightness of the surroundings where the projected image is projected.

  Then, by disposing the diaphragm driving means 32 for displacing the diaphragm plate 33 between the projection lens device 7 and the cone-cave mirror M2, the enlargement of the projector device 1 can be suppressed.

  In particular, the aperture driving means 32 cannot be disposed in the optical path from the lamp 2 to the projection lens device 7 via the flat mirror M1, the cone-cave mirror M2, and the DMD 6, and the flat mirror M1, cone If it is disposed around the frame body in which the cave mirror M2 and DMD 6 are accommodated, the projector device 1 is increased in size. For this reason, space can be saved by effectively utilizing the space between the projection lens device 7 and the cone-cave mirror M2 that is not used, that is, a so-called dead space.

  In the above embodiment, as shown in FIG. 6, a configuration in which the diaphragm plate 33 is disposed inside the projection lens device 7 is also possible. In this case, the position of the aperture plate 33, the shape of the opening 33b, and the like are set so that light other than the on-light LN that passes through the on-light LN and is reflected by the DMD 6 can be blocked.

  Further, the aperture driving means 32 is not limited to the above configuration.

  Furthermore, the details of the projector device 1 are not limited to the above configuration.

It is a perspective view which shows a part of projector apparatus of one embodiment of this invention. It is a perspective view which shows a part of projector apparatus same as the above. (a) is a front view showing the most closed state of the light shielding means of the projector device, (b) is a front view showing an intermediate state of the light shielding means, (c) is a front view showing the most opened state of the light shielding means. is there. It is explanatory side view which shows a part of projector apparatus same as the above. It is an explanatory top view which shows a part of projector apparatus same as the above. It is explanatory side view which shows a part of projector apparatus of other embodiment of this invention. It is explanatory drawing which shows a part of projector apparatus of a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector apparatus 2 Lamp as light source 6 DMD as light modulation means
7 Projection lens device as projection optical system
33 Diaphragm plate as light shielding means
33a Shading surface
33b Aperture O Optical axis

Claims (2)

A light source;
A projection optical system that projects light from the light source onto the screen;
A light modulator disposed between the projection optical system and the light source, and reflects light from the light source to the projection optical system when turned on, and reflects the light in a direction different from that when turned on when turned off;
A light-shielding surface portion that is provided so as to be biased toward a side where light is reflected by the light modulation means when it is off with respect to the optical axis of the projection optical system, and that can shield light reflected by the light modulation means other than when it is on And a light shielding means having an opening provided corresponding to a reflection position of the light reflected by the light modulation means when turned on to the projection optical system. The light shielding means is provided so as to be displaceable between a side where the light is reflected when the light modulation means is turned on and a side where the light is reflected when the light modulation means is turned off. A diaphragm plate that varies the amount of light to be blocked,
The opening is cut out along the shape of the light reflected when the light modulating means is turned on while the diaphragm plate is most displaced to the side where the light is reflected when the light modulating means is turned on. The projector device according to claim 1, wherein:

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