JP2006047683A - Projection lens device and projector device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a projection lens device capable of accurately driving a diaphragm plate. <P>SOLUTION: A 1st transmission means 42 is energized in a direction where it is connected to a 2nd transmission means 43, and is supported by a supporting means 45 so as to be displaced in the direction where it is connected to the 2nd transmission means 43 and a direction where it is separated therefrom. Even when the attaching position of a lens barrel to a frame body and the attaching position of a motor 41 to the frame body are deviated from normal positions, such deviation is absorbed by the turning of the 1st transmission means 42, whereby the driving force of the motor 41 is surely transmitted to the diaphragm plate 31, and the diaphragm plate 31 is accurately driven. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a projection lens device provided in a projector device that projects light, and a projector device including the same.

  Conventionally, in this type of projection lens apparatus, the aperture amount is variable in the optical path of the projection light passing through the projection optical system so that the contrast of the projection image can be varied according to the brightness around the screen. A configuration provided with possible diaphragm means is known (for example, see Patent Document 1).

  However, in such a projection lens apparatus, when the diaphragm amount of the diaphragm means is changed by the driving force of the motor, there are the following problems with respect to the arrangement of the motor.

  When the motor is attached to the lens barrel that holds the projection optical system, the optical axis of the lens barrel may be shifted due to the load of the motor.

  Further, when the zoom mechanism is provided in the lens barrel, there is a problem that the operability of the zoom mechanism is lowered due to the load of the motor.

In order to avoid these problems, a configuration in which a motor is attached to the main body supporting the lens barrel and the motor and the aperture means are connected by a gear train is conceivable.
JP 2004-157348 A (page 5-6, FIG. 1)

  However, in the configuration as described above, the lens barrel and the main body are separate structures, so the accuracy of the mounting position between the lens barrel and the main body, and the accuracy of the mounting position between the motor and the main body. If each of these is not improved, the meshing force between the gears will not be in an appropriate state, and smooth rotation of the gear train cannot be ensured, which may cause a problem in driving the aperture means.

  SUMMARY An advantage of some aspects of the invention is that it provides a projection lens device that can accurately drive a diaphragm unit and a projector device including the projection lens device.

  The projection lens device according to claim 1 is a projection optical system including a lens barrel supported by a main body of a projector device that projects light, and a diaphragm unit that adjusts an amount of light passing through the projection optical system. Driving means for driving the diaphragm means, the driving means having a motor, a first transmission means provided on the main body side, and a second transmission means provided on the lens barrel side, The transmission means for transmitting the driving force of the motor to the throttle means and the first transmission means are provided so as to be biased in a direction to be connected to the second transmission means, and the first transmission means is provided to the second transmission. And a supporting means for supporting each of the means so as to be displaceable in a connecting direction and a separating direction.

  The first transmission means can be urged in the direction connecting to the second transmission means, and the first transmission means is supported by the support means so as to be displaceable in a direction connecting to the second transmission means and in a direction away from the second transmission means. Therefore, even when the mounting position of the lens barrel and the main body part and the mounting position of the motor and the main body part are deviated from the normal position, this deviation is absorbed by the displacement of the first transmission means. Is reliably transmitted to the diaphragm means, and the diaphragm means is driven with high accuracy.

  The projection lens device according to claim 2 is the projection lens device according to claim 1, wherein the first transmission means is formed in a longitudinal shape, and a holding portion in which a middle portion in the longitudinal direction is pivotally supported. A closed-side transmission portion provided at one end portion of the holding portion in the longitudinal direction and connected to the second transmission means by rotation of the holding portion when the diaphragm means is driven in the closing direction, and the longitudinal direction of the holding portion And an open side transmission portion connected to the second transmission means by the rotation of the holding portion when the diaphragm means is driven in the opening direction.

  Then, a longitudinally intermediate portion of the holding portion formed in a longitudinal shape is pivotally supported, and when the throttle means is driven in the closing direction, the closing side transmission portion is turned to the second transmission means by the rotation of the holding portion. Since the open side transmission part is connected to the second transmission means by the rotation of the holding part when the diaphragm means is driven in the opening direction, the first transmission means is relatively simple with respect to the second transmission means. It is possible to displace with a simple configuration.

  A projection lens device according to a third aspect is the projection lens device according to the second aspect, wherein the closed-side transmission portion, the open-side transmission portion, and the second transmission means are each constituted by a rotating gear.

  And the driving force of a motor is reliably transmitted to an aperture means by comprising a closed side transmission part, an open side transmission part, and a 2nd transmission means with a rotating gear, respectively.

  According to a fourth aspect of the present invention, there is provided the projection lens device according to the third aspect, wherein the support means is connected to the closed-side transmission portion and the open-side transmission portion, respectively, and includes a connection rotating gear that is rotated by the driving force of the motor. It is a thing.

  Then, by connecting the connection rotating gear that rotates by the driving force of the motor to the closed side transmission unit and the open side transmission unit, the holding unit rotates corresponding to the rotation direction of the motor, and the closed side transmission unit and Since either one of the open side transmission part is selectively connected to the second transmission means, the rotational force of the motor can be used for the rotation of the holding part, and the configuration can be simplified.

  According to a fifth aspect of the present invention, there is provided the projection lens device according to the third or fourth aspect, wherein the projection optical system includes a movable lens barrel that moves in the optical axis direction and performs a zoom operation. The second transmission means, the closed-side transmission unit and the open-side transmission unit each have a rotation axis along the optical axis direction, and are provided so as to be movable in the optical axis direction along with the movement of the movable barrel. , At least one of them has a gear groove longer than the movable distance of the second transmission means.

  The second transmission means, the closed-side transmission section, and the open-side transmission section are provided so as to have respective rotation axes along the optical axis direction, and the second transmission means, the closed-side transmission section, and the open-side transmission section are provided. Is provided with a gear groove longer than the movable distance of the second transmission means, so that even if the second transmission means moves along the optical axis direction along with the movement of the movable lens barrel. The second transmission means, the closed-side transmission unit, and the open-side transmission unit are reliably meshed with each other.

  The projector device according to claim 6, wherein a light source, a main body, a light modulation unit that modulates light emitted from the light source, and a light that is supported by the main body and is modulated by the light modulation unit are applied to a screen. A projection lens device according to any one of claims 1 to 5 for projecting.

  By providing the projection lens device according to any one of claims 1 to 5, the driving force of the motor is reliably transmitted to the diaphragm means, and the diaphragm means is driven with high accuracy, so that the contrast is changed with high accuracy. It becomes possible.

  According to a seventh aspect of the present invention, in the projector device according to the sixth aspect, the light modulation means reflects light from the light source to the projection lens device when turned on, and reflects the light in a direction different from that when turned on when turned off. It is a reflective element, and the motor is disposed at a position shifted from a position where light is reflected by the reflective element when the motor is off.

  Then, by providing the motor at a position shifted from the position where the light is reflected when the reflective element is turned off, the motor is prevented from being heated by the light reflected by the reflective element when the reflective element is turned off.

  According to the present invention, the aperture means can be driven with high accuracy.

  Hereinafter, the configuration of a projection lens device according to an embodiment of the present invention will be described with reference to FIGS.

  In FIG. 6, reference numeral 1 denotes a projector apparatus. The projector apparatus 1 includes a lamp 2 as a light source, a color wheel unit 4 including a color wheel 3 for coloring 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 that modulates the light guided by the illumination optical system 5, that is, a DMD (Digital Micromirror Device (trade name) )) 6 and a lens barrel 7 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 8 as a main body, and is housed in an exterior housing (not shown) together with the lamp 2, the color wheel unit 4, the lens barrel 7, and the like. Has been.

  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. Are 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 lens unit 12 that condenses the light beam that has been uniformed by the light tube 11, and the lens unit 12 collects the light beam. A reflection mirror M1 that reflects the emitted light beam, a cone-cave mirror M2 that reflects the light beam reflected by the reflection mirror M1 to the DMD 6, and the like are provided.

  The light tube 11 is arranged coaxially with the optical axis O. This light tube 11 is for irradiating the lens unit 12 while making the illuminance of the light colored by the color wheel unit 4 uniform.

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

  The reflection mirror M1 is inclined with respect to the axial direction of the lens unit 12, and is disposed so as to reflect light toward the cone-cave mirror M2.

  The cone-cave mirror M2 is formed in a substantially square shape when viewed from the front, has a conical reflection surface, and is disposed below the lens barrel 7 so as to face the DMD 6. 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 lens barrel 7 is fitted, at the corner.

  The DMD 6 is a reflective element that modulates and reflects the light rays collected by the lenses L1, L2, L3, etc. according to the processed video signal, such as a video signal processing circuit that processes the video signal. Implemented in electronic circuits. Specifically, the DMD 6 has a large number of minute mirrors (not shown) in a matrix, and these mirrors are turned on / off, that is, switched, and reflect light to the lens barrel 7 when turned on (on light (projection light)). When off, light is reflected in the upper right direction of the optical axis O, which is a direction different from the reflection direction when on (off light (non-projection light)).

  The lens barrel 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 8 via a lens barrel holding plate 17. Yes.

  The focus ring 15 is provided so as to be rotatable around the optical axis O. By rotating the focus ring 15, the lens located at the foremost part moves back and forth along the optical axis O, thereby focusing. Action is taken.

  The zoom ring 16 is provided so as to be rotatable around the optical axis O independently of the focus ring 15 and holds the front portion of the cylindrical movable lens barrel 18 inside. Here, the movable lens barrel 18 is provided so as to be movable in the front-rear direction along the optical axis direction in conjunction with the rotation of the zoom ring 16, and the magnification of the projected image is changed by the movement in the front-rear direction. Zooming.

  As shown in FIG. 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 movable barrel 18 is inserted and protrudes into the frame body 8. Has been drilled. The lens barrel holding plate 17 is provided with screw holes 29 at the four corners, and the lens barrel holding plate 17 is attached to the frame body 8 by inserting and tightening screws (not shown) in the screw holes 29 respectively. Fixed to.

  Further, as shown in FIG. 1 and FIG. 2, the movable lens barrel 18 has a diaphragm plate 31 as a diaphragm means for adjusting the amount of light passing through the lens barrel 7, and a drive for driving the diaphragm plate 31. Means 32 are provided respectively. The diaphragm plate 31, the drive means 32, the lens barrel 7 and the like constitute a projection lens device 33.

  The diaphragm plate 31 is provided so as to be movable integrally with the movable lens barrel 18, and has a diaphragm portion 35 that protrudes in an arc shape toward the center side of the movable lens barrel 18, that is, the optical axis side, and a lower right portion of the diaphragm portion 35. And a supported portion 36 extending downward from the bottom. The diaphragm plate 31 is supported by a diaphragm plate support portion 37 that protrudes horizontally behind the large-diameter portion 18a of the movable barrel 18 located inside the hole portion 28 of the lens barrel holding plate 17. 36 is pivotally supported, and is urged forward along the optical axis direction by a spring 38 as a diaphragm urging member.

  The drive means 32 is provided to be movable integrally with the movable lens barrel 18 along the optical axis direction, connected to the motor 41, the first transmission means 42 driven by the motor 41, and the first transmission means 42. The transmission means 44 having the second transmission means 43 and the first transmission means 42 can be urged in the direction of connection to the second transmission means 43, and the first transmission means 42 is connected to the second transmission means 43. And a support means 45 that is displaceably supported in the connecting direction and the separating direction.

  The motor 41 pivotally supports a holding portion 46 provided in the first transmission means 42 and is fixed to an attachment frame 47 fixed to the frame body 8 so that the cone-cave mirror M2 against reflected light from the DMD 6 is fixed. Located behind the corn cave mirror M2 behind. That is, the motor 41 is disposed on the lower left side with respect to the optical axis O. In other words, the motor 41 is disposed on the opposite side to the off-light reflection direction from the DMD 6 with the optical axis O interposed therebetween, and is deviated from the off-light reflection position.

  Here, the mounting frame 47 is fixed to the frame body 8 and has a horizontal and longitudinal board part 51 along the left-right direction, and a shaft support that is bent upward from the front and rear of the board part 51 and holds the holding part 46 from the front and rear. Plates 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 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 portion 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 portion that is rotatably held by the holding portion 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 attached to the frame body 8.

  As shown in FIG. 3, the holding portion 46 includes a U-shaped frame portion 61 that is an intermediate portion in the longitudinal direction of the holding portion 46, and a plate portion that extends from the U-shaped frame portion 61 in the left-right direction. Holding arm portions 62 and 63, and is formed in a substantially V shape in a front view.

  The U-shaped frame portion 61 includes rotating plates 65 and 65 that are rotatably supported by the shaft support plates 52 and 52, and a connecting plate 66 that connects the upper portions of the rotating plates 65 and 65 to each other. The lower side is formed in a U-shape. The rotation plates 65 and 65 are provided with rotation holes 67 and 67, respectively, along the optical axis direction.

  The holding arm portions 62 and 63 are provided so as to be inclined from the front rotation plate 65 of the U-shaped frame portion 61 in the left-right direction and upward. Then, at the rear portion of the holding arm 62, shaft portions 68 and 68 on which the open-side transmission gear G3 and the transmission gear G4 are rotatably supported are projected substantially horizontally rearward along the optical axis direction. Further, shaft portions 69 and 69, on which the closed side transmission gear G1 and the transmission gear G2 are pivotally supported, are projected substantially horizontally along the optical axis direction at the rear portion of the holding arm portion 63. Yes. The closed side transmission gear G1 is positioned at one end of the holding portion 46, that is, the right end portion, which is the tip of the holding arm portion 63 by the shaft portion 69, and the open side transmission gear G3 is held by the holding arm portion 62 by the shaft portion 68. Is located at the other end of the holding portion 46, that is, the left end.

  The shaft portions 68 and 68 and the shaft portions 69 and 69 are spaced apart from each other. Further, the shaft portions 68 and 68 are separated by a distance at which the transmission gears G3 and G4 pivotally supported by the shaft portions 68 and 68 can mesh with each other. Similarly, the shaft portions 69 and 69 are separated by a distance at which the transmission gears G1 and G2 pivotally supported by the shaft portions 69 and 69 can mesh with each other.

  Therefore, as shown in FIGS. 1 and 2, the closed-side transmission gear G1 has a rotating shaft along the optical axis direction, and is held by the urging spring 71 as a closed-side transmission portion urging body. It is biased toward the front side along the 63 side, that is, along the optical axis direction. Similarly, the open-side transmission gear G3 has a rotation axis along the optical axis direction, and by the biasing spring 72 as the open-side transmission unit biasing body, on the holding arm 62 side, that is, along the optical axis direction. It is urged to the front side. 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.

  As shown in FIGS. 2 and 4, the second transmission means 43 has a second transmission means holding portion provided on the outer peripheral surface of the movable lens barrel 18 with the rear portion of the movable lens barrel 18 inserted therein. Held in 76. Here, the inner diameter dimension of the second transmission means 43 and the outer diameter dimension of the second transmission means holding portion 76 are such that the second transmission means 43 can smoothly rotate around the second transmission means holding portion 76. Is set to

  In addition, the front side of the second transmission means 43 is positioned by a holding step portion 77 formed in a step shape so as to have a large diameter on the front side of the second transmission means holding portion 76 of the movable barrel 18, and the movable barrel 18 The rear side is positioned by the pins 78 and 79 attached to the optical axis O, and the rear side is positioned so as not to rattle in the front-rear direction with respect to the movable barrel 18 and to be inclined with respect to the optical axis O. As a result, the second transmission means 43 has a rotation axis along the optical axis direction, and is provided to be movable back and forth along the optical axis direction as the movable lens barrel 18 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. A 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. 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 31 projects forward from the cam portion 85, and the cam pin 86 is formed in the diaphragm plate 31 from the diaphragm portion 35 to the supported portion 36. It is inserted into the arcuate cam groove 87.

  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 groove 87 cause the cam pin 86 to move. When the diaphragm portion 35 of the guided diaphragm plate 31 approaches or moves away from the optical axis O, the diaphragm plate 31 is opened and closed, and the diaphragm amount of light passing through the movable lens barrel 18 is adjusted.

  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 movable barrel 18. That is, the gear unit 75 has a gear groove longer than the moving distance of the movable lens barrel 18. 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 movable lens barrel 18.

  The support means 45 has both connection gears G5 as connection rotation gears, and a support shaft 88 that rotatably supports both connection gears G5 with the holding portion 46 with respect to the mounting frame 47.

  Both connecting gears G5 are connected to a rotation hole (not shown) formed in the rotation holes 67 of the rotation plates 65 and 65 of the U-shaped frame portion 61 of the holding portion 46 and the shaft support plates 52 and 52 of the mounting frame 47. The shaft is rotatably supported by the inserted support shaft 88 and meshed with the transmission gears G2 and G4 and the 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, the connection gear G5 and the holding portion 46 are provided so as to freely rotate with respect to the support shaft 88, respectively.

  The frame body 8 is formed of a member such as metal, for example, and as shown in FIG. 6, the color wheel unit 4, the illumination optical system 5, the DMD 6, and the lens barrel 7 are respectively attached and held in the exterior casing. Yes.

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

  The light emitted from the lamp 2 is colored by red (R), green (G), and blue (B) in a time-sharing manner by the color wheel 3, and after the illuminance is made uniform by the light tube 11. The light is condensed by the lens unit 12 and reflected by the reflecting 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 is reflected to the lens barrel 7 and is projected onto the screen after being subjected to focus adjustment and zoom adjustment. The 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, as shown in FIG. 5A, for example, when both connecting gears G5 are rotated counterclockwise, the holding portions provided from the biasing springs 71 and 72 to the transmission gears G1 and G3. Due to the friction with respect to the rotation direction of 46, the rotation of both connection gears G5 acts as a rotational force in the circumferential direction of the support shaft 88 of the holding portion 46, and the holding portion 46 also rotates counterclockwise, and both connection gears A closed transmission gear G1 that rotates around the planet G5 is connected to the gear portion 75 of the second transmission means 43.

  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 clockwise about the rotation axis of the second transmission means 43. The diaphragm plate 31 is rotated downward about the diaphragm plate support 37 by the action of the cam pin 86 and the cam groove 87, and the diaphragm plate 31 is closed. By projecting toward the optical axis O, which is the central axis of the tube 18, the amount of light passing through the movable lens barrel 18 is reduced.

  On the other hand, as shown in FIG. 5 (b), when both connecting gears G5 are rotated in the clockwise direction, for example, the holding portion 46 is also rotated in the clockwise direction by the same action as that in the case of rotating in the counterclockwise direction. An open-side transmission gear G3 that rotates and planetarily rotates around both connection gears G5 is connected to the gear portion 75 of the second transmission means 43.

  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 the optical axis that is the rotation axis of the second transmission means 43. The diaphragm plate 31 is rotated counterclockwise about O, and the diaphragm plate 31 is pivoted upward about the diaphragm plate support 37 by the action of the cam pin 86 and the cam groove 87 to open the diaphragm plate 31. The amount of light passing through the movable lens barrel 18 increases as the diaphragm 35 moves backward in the radial direction of the movable lens barrel 18.

  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 portion 46 around the support shaft 88. The holding portion 46 rotates 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 open side transmission gear G1 or the closed side transmission gear G3 to the second transmission means 43 acts on the holding portion 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.

  As described above, in the above-described embodiment, the first transmission means 42 is biased in the direction in which the first transmission means 42 is connected to the second transmission means 43 and can be displaced in the direction in which the first transmission means 43 is connected to and away from the second transmission means 43. The first transmission means 42 is supported by the support means 45.

  As a result, the mounting position between the lens barrel 7 and the frame body 8, specifically, the mounting position in the height direction between the second transmission means 43 and each transmission gear G1, G3, and the motor 41 and the frame body 8 Even if the mounting position of the first transmission means deviates from the normal position, the first transmission means 42 rotates to absorb this deviation, and the second transmission means 43 and the transmission gears G1, G3 are surely connected. Since it is connected and the driving force of the motor 41 is reliably transmitted to the diaphragm plate 31, the diaphragm plate 31 can be driven with high accuracy.

  Further, the intermediate portion in the longitudinal direction of the holding portion 46 is pivotally supported, and when the diaphragm plate 31 is driven in the closing direction, the closing side transmission gear G1 is moved to the second transmission means 43 by the rotation of the holding portion 46. Since the open side transmission gear G3 is connected to the second transmission means 43 by the rotation of the holding portion 46 when the diaphragm plate 31 is driven in the opening direction, the first transmission means 42 is connected to the second transmission means 43. On the other hand, it can be displaced with a relatively simple configuration.

  Furthermore, the driving force of the motor 41 can be reliably transmitted to the aperture plate 31 by configuring the closed-side transmission gear G1, the open-side transmission gear G3, and the second transmission means 43 by rotating gears.

  Then, by connecting the two connection gears G5 rotated by the driving force of the motor 41 to the transmission gears G1 and G3, respectively, the holding portion 46 is rotated corresponding to the rotation direction of the motor 41, and the closed-side transmission gear. Since G1 and the open side transmission gear G3 are selectively connected to the second transmission means 43, the rotational force of the motor 41 is used for the rotation of the holding part 46, and the urging means for rotating the holding part 46, etc. Since it is not necessary to provide a separate layer, the configuration can be simplified.

  Further, the second transmission means 43 and the transmission gears G1 and G3 are provided so as to have respective rotation axes along the optical axis direction, and the gear groove of the gear portion 75 of the second transmission means 43 is provided as a movable lens barrel. Even if the second transmission means 43 moves along the optical axis direction as the movable lens barrel 18 moves, the second transmission means 43 and the transmission gears G1, G3 Can be reliably engaged.

  Furthermore, even if the closed-side transmission gear G1 or the open-side transmission gear G3 connected to the gear portion 75 of the second transmission means 43 tries to rotate in a state where the rotation of the second transmission means 43 is restricted, The closing side transmission gear G1 connected to the gear portion 75 of the second transmission means 43 or the open side is caused by the force to rotate the closed side transmission gear G1 or the open side transmission gear G3. The transmission gear G3 acts as a force that rotates in a direction away from the gear portion 75 of the second transmission means 43 and escapes, and the transmission of the driving force of the motor 41 to the second transmission means 43 is cut off, and the closed side transmission It is possible to prevent an excessive force from being applied between the gear G1 or the open side transmission gear G3 and the second transmission means 43.

  Since the projector device 1 includes the projection lens device 33, the driving force of the motor 41 is reliably transmitted to the diaphragm plate 31, and the diaphragm plate 31 can be driven with high accuracy, so that the contrast of the projected image is changed with high accuracy. Therefore, the image quality of the projector device 1 can be improved.

  Further, by providing the motor 41 on the side opposite to the side where the light is reflected by the DMD 6 when it is off with respect to the optical axis O, it is possible to prevent the motor 41 from being heated by the light reflected by the DMD 6 when it is off.

  Moreover, since the motor 41 is disposed behind the cone-cave mirror M2, the ON light from the DMD 6 is not irradiated to the motor 41, and the motor 41 can be prevented from being heated by the ON light. .

  Further, by attaching the motor 41, the first transmission means 42 and the holding portion 46 to the frame body 8 via the attachment frame 47, the motor 41, the first transmission means 42 and the holding portion 46 can be assembled as a unit. , Productivity can be improved.

  Then, by attaching the motor 41 to the frame body 8 side, the optical axis O of the lens barrel 7 is shifted due to the load of the motor 41 as compared with the case where the motor is attached to the lens barrel side. It is possible to prevent the operability of the function from being lowered.

  Further, the holding portion 46 can be stably supported by pivotally supporting the holding portion 46 at two locations of the rotating plates 65 and 65.

  Further, by using the worm gear WG, the rotation state of the first transmission means 42 is maintained without the worm gear WG rotating reversely due to the weight of the first transmission means 42, etc., so that the diaphragm plate 31 rotates unexpectedly. Thus, the contrast can be prevented from changing.

  In the above embodiment, each of the transmission means 42 and 43 can be configured as a roller instead of the rotating gear.

  Further, instead of setting the length of the gear groove of the gear portion 75 of the second transmission means 43 to be longer than the moving distance of the movable lens barrel 18, the gear grooves of the transmission gears G1, G3 of the first transmission means 42 are set. The length may be set to be longer than the moving distance of the movable lens barrel 18 or the gear grooves of both the gear portion 75 of the second transmission means 43 and the transmission gears G1 and G3 of the first transmission means 42 may be used. May be set longer than the moving distance of the movable lens barrel 18.

  Furthermore, the projector device 1 is not limited to the above configuration, and may be a transmissive projector device or a projector device that does not perform light modulation, for example.

It is a perspective view which shows a part of projection lens apparatus of one embodiment of this invention. It is a perspective view which shows a projection lens apparatus same as the above. It is a disassembled perspective view which shows a projection lens apparatus same as the above. It is a perspective view which shows the holding | maintenance part of a projection lens apparatus same as the above. (a) is a perspective view showing a closed state of the diaphragm means of the projection lens device, and (b) is a perspective view showing an opened state of the diaphragm means. It is a top view which shows the projector apparatus provided with the projection lens apparatus same as the above.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector apparatus 2 Lamp as light source 6 DMD as light modulation means
7 Lens barrel as projection optical system 8 Frame body as main body
18 Moving barrel
31 Diaphragm plate as a diaphragm means
32 Drive means
33 Projection lens device
41 motor
42 First transmission means
43 Second transmission means
44 Means of transmission
45 Support means
46 Holding part
G1 Closed transmission gear as closed transmission unit
G3 Open side transmission gear as open side transmission
G5 Double connecting gear as connecting rotating gear O Optical axis

Claims (7)

A projection optical system including a lens barrel supported by the main body of the projector device that projects light;
Diaphragm means for adjusting the amount of light passing through the projection optical system;
Driving means for driving the aperture means,
The driving means includes
A motor,
A first transmission means provided on the main body side and a second transmission means provided on the lens barrel side; a transmission means for transmitting the driving force of the motor to the diaphragm means;
The first transmission means is provided so as to be biased in the direction of connection to the second transmission means, and the first transmission means is supported so as to be displaceable in the direction of connection to the second transmission means and in the direction away from the second transmission means. A projection lens device, comprising: a support means for supporting the projection lens device. The first transmission means is
A holding portion that is formed in a longitudinal shape and whose longitudinal intermediate portion is pivotally supported;
A closed-side transmission portion that is provided at one end of the holding portion in the longitudinal direction and is connected to the second transmission means by the rotation of the holding portion when the diaphragm means is driven in the closing direction;
Provided on the other end portion in the longitudinal direction of the holding portion, and provided with an open side transmission portion connected to the second transmission means by rotation of the holding portion when the throttle means is driven in the opening direction. The projection lens device according to claim 1. The projection lens device according to claim 2, wherein each of the closed-side transmission unit, the open-side transmission unit, and the second transmission unit includes a rotating gear. The projection lens apparatus according to claim 3, wherein the support means includes a connection rotating gear that is connected to each of the closed-side transmission unit and the open-side transmission unit and rotates by a driving force of a motor. The projection optical system includes a movable lens barrel that moves in the optical axis direction and performs a zoom operation
The second transmission means is provided to be movable in the optical axis direction along with the movement of the movable lens barrel,
The second transmission unit, the closed-side transmission unit, and the open-side transmission unit each have a rotation axis along the optical axis direction, and at least one of the second transmission unit, the movable transmission distance of the second transmission unit, and the like. The projection lens device according to claim 3 or 4, wherein the projection lens device has a long gear groove. A light source;
The main body,
A light modulation means for modulating light emitted from the light source;
A projector device comprising: the projection lens device according to claim 1, which is supported by the main body portion and projects the light modulated by the light modulation unit onto a screen. The light modulation means is a reflective element that reflects light from the light source to the projection lens device when turned on, and reflects light in a direction different from that when turned on when turned off,
The projector device according to claim 6, wherein the motor is disposed at a position shifted from a position where light is reflected by the reflective element when the motor is off.

Images