JP2004170730A - Shutter driving device and driving method - Google Patents

Abstract

In a conventional shutter driving device, a light shielding plate can quickly move to a position where the light path from the light valve to the projection lens is completely shielded and a position completely retracted from the light path, and can be reliably stopped at a predetermined position. In the case where it is difficult to perform this operation and there is a failure in the detection means or a short circuit in the wiring, there is a problem that the light-shielding plate continues to rotate, which may cause serious damage to the entire device.
A light shield having a straight or curved concave portion that can rotate around a rotation support shaft and move to a first stop position that blocks a predetermined optical path and a second stop position that does not block the optical path. The light shielding plate 13 includes a plate 13 and a driving member 21 having a driving projection 20 engaged with the recess 12. The light-shielding plate 13 is rotated by the movement of the driving projection 20. The light blocking plate 13 moves so as to decrease in rotational speed as approaching one stop position or the second stop position or both stop positions.
[Selection diagram] Fig. 1

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a shutter driving device.
[0002]
For example, a transmission type light valve represented by a liquid crystal panel, or a reflection type light valve such as a mirror array element composed of a micro-rotatable mirror is used, and an optical path from a light source is transmitted to the light valve, or Used in projection display devices that reflect and transmit an image consisting of the transmitted light or reflected light from the light valve to a screen outside the device using a projection lens. The shutter driving device can arbitrarily block an optical path from the light valve to the projection lens in order to prevent light, stray light, and the like from being incident on the projection lens and being projected on the screen.
[0003]
[Prior art]
As a conventional shutter device, for example, there is one disclosed in Patent Document 1. FIG. 10 is a perspective view illustrating the structure of a conventional shutter device. 2. Description of the Related Art Conventionally, a shutter device 101 used in a projection display device uses a DMD (Digital Micromirror Device) or a liquid crystal (LCD) panel as a light valve, and is used in a projection display device in which a projection lens projects onto a screen. It is equipped to prevent light leakage in the state, and includes a rotary driving device 102 including a DC motor, a light shielding plate 103 attached to its output shaft, and sensors 104 and 105 for detecting the position of the light shielding plate 103. You.
[0004]
Next, the operation will be described. When the image mute is instructed, the rotation driving device 102 rotates the light shielding plate 103 in the direction of the arrow V, and the sensor 104 detects that the light shielding plate 103 has moved to a position where the light path from the light valve to the projection lens is completely blocked. Upon detection, the rotation driving device 102 is stopped.
[0005]
Conversely, when the image mute state is released, the rotation driving device 102 rotates the light shielding plate 103 in the direction of the arrow W, indicating that the light shielding plate 103 has moved to a position completely retracted from the optical path from the light valve to the projection lens. The rotation is detected by the sensor 105 and the rotation driving device 102 is stopped.
[0006]
[Patent Document 1]
JP 2001-174910 A
[Problems to be solved by the invention]
In this shutter device, the light shielding plate 103 quickly moves to a position where the light path from the light valve to the projection lens is completely shielded and a position completely retracted from the light path, and stops at a predetermined position without fail. Is required.
[0008]
It is also required that the device be configured so as not to cause serious damage to the entire device even if there is a failure of the detecting means or a short circuit of the wiring.
[0009]
However, in the configuration in which the light shielding plate 103 is directly attached to the output shaft of the rotary driving device 102 as in the related art, the stop position of the light shielding plate 103 cannot be accurately detected by the sensors 104 and 105 if the movement is to be accelerated. The position became uncertain, and complicated control was required to stop accurately.
[0010]
In addition, when the sensors 104 and 105 serving as the detecting means are out of order or the wiring to the sensors is short-circuited, the light shielding plate 103 continues to rotate, which may cause serious damage to the entire apparatus.
[0011]
Further, when the light-shielding plate 103 blocks the optical path for a long time, the light-shielding plate is heated, and there is a problem that a portion of a device that the light-shielding plate contacts, such as the rotary driving device 102, becomes hot.
[0012]
According to the present invention, the light-shielding plate quickly moves to a position where the light path blocks the predetermined optical path and a position where the light path does not block the optical path, and can be reliably stopped at the predetermined position. It is an object of the present invention to provide a shutter driving device and a driving method which do not cause serious damage to the entire device even if it exists, or minimize a temperature rise of the light shielding plate.
[0013]
[Means for Solving the Problems]
In order to solve this problem, a shutter driving device according to the first invention of the present application is:
A light shield having a linear or curved concave portion (12) that can be rotated about a pivot shaft (11) and moved to a first stop position that blocks a predetermined optical path and a second stop position that does not block the optical path. A driving member (21) having a driving projection (20) engaged with the recess (12);
The light shielding plate (13) is rotated by the movement of the driving projection (20), and the driving projection (20) is stopped at the first stop position, the second stop position, or both stop positions. The shutter driving device moves so that the rotation speed of the light shielding plate (13) decreases as the distance from the shutter increases.
[0014]
The shutter driving device of the second invention of the present application is
A light-shielding plate (52) having a convex portion (51), which is rotatable about a rotation support shaft and is movable to a first stop position for interrupting a predetermined optical path and a second stop position for not interrupting the optical path; A driving member (57) having a linear or curved driving concave portion (55) engaged with the convex portion (51);
The light shielding plate (52) is rotated by the movement of the driving recess (55), and the driving recess (55) approaches the first stop position, the second stop position, or both stop positions. The shutter driving device moves so as to decrease the rotation speed of the light shielding plate (52).
[0015]
The shutter driving device according to the third invention of the present application is:
A transmissive or reflective light valve (1) capable of optically modulating each pixel; and a light valve (1) for projecting light transmitted through the light valve (1) or reflected from the light valve (1); A) a projection type display device having a projection lens (2) for enlarging and projecting the image of
The light-shielding plate (13) is located between the light valve (1) and the projection lens (2), and rotates around a rotation support shaft (11) to rotate from the light valve (1) to the projection lens. The shutter drive device according to the first or second aspect of the present invention, wherein the shutter drive device moves to a first stop position that blocks an optical path to (2) and a second stop position that does not block the optical path.
[0016]
The shutter driving device of the fourth invention of the present application is:
The driving convex portion (20) or the driving concave portion (55) is moved by a gear mechanism, and at least one gear (17) of the gear mechanism is turned when a predetermined rotation angle or more is turned. A shutter drive device according to any one of the first to third aspects of the present invention, wherein the gear mechanism is a toothless gear that is disengaged from the gear, and the gear mechanism is configured to run idle even if the drive source (24) continues to move. .
[0017]
According to a fifth aspect of the present invention, there is provided a shutter driving device,
In the first stop position and the second stop position, the protrusion (51) and the driving protrusion (20) are moved away from the first stop position and the second stop position by an elastic body (22). The shutter driving device according to any one of the first to fourth aspects of the present invention, which is biased.
[0018]
The shutter device of the sixth invention of the present application
A transmissive or reflective light valve (1) capable of optically modulating each pixel; and a light valve (1) for projecting light transmitted through the light valve (1) or reflected from the light valve (1); And a projection lens (2) for enlarging and projecting the image of (1).
It is located between the light valve (1) and the projection lens (2), and rotates around a rotation support shaft (11) to form an optical path from the light valve (1) to the projection lens (2). A shutter device comprising a first stop position for blocking and a light shielding plate (13) moving to a second stop position for not blocking the optical path,
A shutter device wherein the light reflectance of the light valve (1) side surface of the light shielding plate (13) is higher than the light reflectance of the projection lens (2) side surface.
[0019]
The shutter device according to the seventh aspect of the present invention includes:
The light shielding plate (13) is a metal plate, and is a shutter device according to a sixth aspect of the present invention, in which the surface on the side of the projection lens (2) is painted black.
[0020]
The shutter driving method according to an eighth aspect of the present invention includes:
A light shield having a linear or curved concave portion (12) that can be rotated about a pivot shaft (11) and moved to a first stop position that blocks a predetermined optical path and a second stop position that does not block the optical path. A driving method for a shutter device, comprising: a plate (13); and a driving member (21) having a driving projection (20) engaged with the recess (12).
When the light shielding plate (13) is rotated by the movement of the driving projection (20), the light shielding plate (13) is moved toward the first stop position, the second stop position, or both stop positions. This is a driving method of the shutter device, in which the driving projection (20) is moved so that the rotation speed decreases.
[0021]
The ninth aspect of the present invention is a shutter driving method,
A light-shielding plate (52) having a convex portion (51) that can rotate to a first stop position for blocking a predetermined optical path and a second stop position for not blocking the optical path by rotating about a pivot shaft; A driving member (57) having a linear or curved driving concave portion (55) engaged with the portion (51), the driving method comprising:
When the light shielding plate (52) is rotated by the movement of the driving concave portion (55), the rotation of the light shielding plate (52) becomes closer to the first stop position, the second stop position, or both stop positions. This is a driving method of the shutter device, in which the driving concave portion (55) is moved so that the moving speed decreases.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 to 9.
[0023]
(Embodiment 1)
1 to 6 show an embodiment of the shutter device of the present invention. FIG. 1 is a perspective view for explaining the structure of the shutter device, FIG. 2 is an exploded view of the shutter device, and FIG. FIG. 4 is a side view showing an outline of the system, FIG. 4 is a cross-sectional view showing a light shielding plate, FIG. 5 is an operation explanatory view of the shutter device, and FIG.
[0024]
1 to 3, a projection display device includes a DMD (digital micromirror device) 1 as a light valve capable of optically modulating each pixel and only light reflected in a predetermined direction by the DMD 1 outside the device. It comprises a projection lens 2 for enlarging and projecting onto a screen, a shutter device 3 located between the DMD 1 and the projection lens 2 and capable of arbitrarily blocking an optical path therebetween, and an illumination optical device 4 for irradiating the DMD 1 with light from a predetermined direction. ing. The illumination optical device 4 includes a light emitting tube 5 that emits white light, a concave mirror 6 that reflects and condenses light from the light emitting tube 5 in a predetermined direction, a color wheel 7, and a light that is once condensed and color-separated. It comprises a plurality of lens groups 8 for irradiating the DMD 1 and a reflection mirror 9. The color wheel 7 is rotatably driven and is composed of a color filter that transmits red (hereinafter, R) light, green (hereinafter, G) light, and blue (hereinafter, B) light, and transmits R, G, and B light. Color separation in time.
[0025]
Next, a detailed configuration of the shutter device 3 will be described.
[0026]
The light shielding plate 13 has a long hole 12 and is rotatably attached to the support shaft 11 as a rotation support shaft. At the rotational position of the light shielding plate 13, a sensor 14 for detecting a position at which the optical path from the DMD 1 to the projection lens 2 is blocked, and a sensor 15 for detecting a position at which the light path is not blocked are attached. The sector gear 21 as a driving member is rotatably supported by the support shaft 16 and has a driving pin 20 that engages with the long hole 12 of the light shielding plate 13. Further, the sector gear 21 has a gear shape 17 on a part of the outer periphery, and embossed shapes 18 and 19 on both sides of which are out of mesh with the mating gear. A tension spring 22 as biasing means is provided between the support shaft 11 and the drive pin 20. The DC motor 24 is a driving source of the light shielding plate 13 and has a worm gear 23 attached to an output shaft thereof. The reduction gear 27 includes a worm wheel gear 25 meshing with the worm gear 23 and a gear 26 meshing with the sector gear 21.
[0027]
The light shielding plate 13 is made of a metal plate having a high reflectance, such as a bright aluminum alloy plate, as a material. Further, only the side facing the projection lens 2 has a matte black coating.
[0028]
The operation of the shutter device configured as described above will be described below.
[0029]
First, the basic operation of the projection display device will be briefly described. The white light emitted from the arc tube 5 is reflected by the concave mirror 6 so as to converge on or near the color wheel 7, and the color wheel 7 rotates at a constant speed to emit the R, G, and B lights at a predetermined timing. Let through. The transmitted light is applied to the DMD 1 by the lens group 8 and the reflection mirror 9. The irradiated light is synchronized with the timing of the irradiated R light, G light, and B light, and is modulated by the DMD 1 according to the input information.
[0030]
The pixel to be displayed controls the angle of the corresponding micromirror in a predetermined direction, reflects the light in the direction in which the light enters the projection lens 2, and projects the light on a screen (not shown) outside the apparatus. Conversely, for a pixel that is not desired to be displayed, the angle of the corresponding micromirror is controlled in a predetermined direction, the light is reflected in a direction that does not enter the projection lens 2, and the light of the pixel is not projected on a screen outside the device.
[0031]
By performing these operations at a high speed, a full-color image can be viewed on the screen by the afterimage effect of the eyes.
[0032]
The shutter device 3 is used when the image is muted. In other words, even if all the pixels are displayed in black, reflection of light that hits other than the micro mirror of the DMD 1 or slight light such as diffracted light on the surface of the DMD 1 enters the projection lens 2 and emits light outside the device. It is used to prevent that. As shown in FIG. 4, the surface of the light shielding plate 13 on the DMD 1 side is made of a material having a high reflectance, and the surface of the projection lens 2 is matte black. Thus, even if stray light such as diffracted light or unnecessary reflected light from the DMD 1 hits the light shielding plate 13, the temperature rise can be minimized. At the same time, with respect to stray light and the like from the direction of the projection lens 2 of the light shielding plate 13, the light emitted from the projection lens 2 can be further suppressed by suppressing the reflection on the surface.
[0033]
Details of the operation will be described with reference to FIG. First, a normal use state (a state in which an image is projected on an external screen) is shown in FIG. At this time, the light shielding plate 13 is completely retracted from the optical path, and the sensor 15 can detect that the light shielding plate 13 is at that position.
[0034]
When an instruction to mute the image is given, the display is set to an all black display state, the DC motor 24 starts rotating in the direction of arrow A, and the reduction gear 27 and the sector gear 21 rotate in the directions of arrow C and arrow E, respectively. The light shielding plate 13 is rotated in the direction of arrow G by the action of the drive pin 20 of the sector gear 21 and the long hole 12. After the state shown in FIG. 5B, the light blocking plate 13 is rotated until the light path from the DMD 1 to the projection lens 2 is completely blocked, and the position is detected by the sensor 14 and the DC motor 24 is stopped at the same time. The light shielding plate 13 stops in the state of ()).
[0035]
When returning to the normal use state, the DC motor 24 starts rotating in the direction of arrow B, and the reduction gear 27 and the sector gear 21 rotate in the directions of arrow D and arrow F, respectively. The light shielding plate 13 is rotated in the direction of arrow H by the action of the drive pin 20 of the sector gear 21 and the long hole 12. After the state shown in FIG. 5B, the light-shielding plate 13 is rotated until it retracts from the optical path from the DMD 1 to the projection lens 2, the position is detected by the sensor 15, and the DC motor 24 is stopped at the same time. In this state, the light shielding plate 13 stops.
[0036]
As is clear from each state of FIG. 5, when the light shielding plate 13 is near (a) and (c), the position where the drive pin 20 acts is far from the support shaft 11 and the swing direction is the long hole 12. In the longitudinal direction. Near the middle of the swing range of the light shielding plate 13 (b), the position where the drive pin acts is near the support shaft 11, and the swing direction is substantially perpendicular to the longitudinal direction of the long hole 12.
[0037]
By these actions, when the sector gear 21 rotates at a constant speed, the rotation speed of the light shielding plate 13 is slow near (a) and (c), becomes faster near (b), and even if the stop timing is slightly before or after. In addition, it is possible to minimize the shift of each stop position of the light shielding plate 13.
[0038]
6A and 6B, even when the position of the light shielding plate 13 cannot be detected due to a failure of the sensors 14 and 15 or a short circuit of the wiring to the sensors 14 and 15, and the DC motor continues to rotate. As described above, the sector gear 21 is rotated by a predetermined rotation angle or more, the relief shapes 18 and 19 are rotated to the position of the reduction gear 27, and the engagement with the reduction gear 27 is released. As a result, the light-shielding plate 13 rotates by a slight angle with respect to the predetermined rotation angle, but stops at that position without causing any serious damage to the entire apparatus.
[0039]
In this state, the tension spring 22 provided between the drive pin 20 of the sector gear 21 and the support shaft 11 tends to contract, so that the sector gear 21 is moved in the direction of arrow F in FIG. In this case, since the rotational force is urged in the direction of arrow E, when the failure is improved and the DC motor 24 starts to rotate in the reverse direction, the reduction gear 27 and the sector gear 21 can mesh again, and can return to the normal state.
[0040]
The sensor is not limited to the contact type, and a part of the illumination light 28 is reflected by the reflecting mirror 30 to form a light beam to the light receiving element 31 as shown in FIG. It is also possible to take a method of detecting the interruption with the light receiving element 31 or the like.
[0041]
Further, it is also possible to use a stepping motor instead of the DC motor, and control only by the number of steps of the motor without using a sensor.
[0042]
Further, a tension spring is provided between the drive pin and the fixed shaft as a means for urging the sector gear with a rotational force. However, if a similar urging force can be applied, the tension spring is not necessarily limited to the tension spring. It is also possible to use them, and the same effect can be obtained by using these alternative means.
[0043]
Further, in the mechanism of the present description, the rotation speed of the light shielding plate 13 changes continuously in the movements of FIGS. 5A, 5B, and 5C, but is faster near the position of FIG. , (C), the rotation speed of the light shielding plate 13 may be changed stepwise.
[0044]
In the present description, the long hole 12 is used as the concave portion for driving the light shielding plate 13, but the groove may be engaged with the convex portion (the driving pin 20 in the description of the first embodiment) for driving the light shielding plate. Good.
[0045]
(Embodiment 2)
8 and 9 show another embodiment of the shutter device of the present invention. FIG. 8 is a perspective view for explaining the structure of a drive unit of the shutter device, and FIG. 9 is an operation explanatory diagram of the shutter device. The other configuration is basically the same as that of the first embodiment, and therefore the description is omitted.
[0046]
It is used for a projection type display device similar to that of the first embodiment, and the drive unit of the shutter device has a light shielding plate 52 having a pin 51 having a protruding shape as a cam follower, which is rotatably mounted. At the rotational position of the light shielding plate 52, a sensor 53 for detecting a position at which the optical path from the DMD to the projection lens is interrupted, and a sensor 54 for detecting a position at which the optical path is not interrupted are attached. A driving cam gear 57 as a driving member is rotatably mounted at a position different from the rotation center of the light shielding plate 52. The drive cam gear 57 has a groove cam 55 that engages with the pin 51 and a gear shape 56 on the outer periphery. The drive cam gear 57 includes a drive unit (not shown) that meshes with the gear shape 56 to apply a drive force.
[0047]
The operation of the shutter device configured as described above will be described below.
[0048]
First, the basic operation of the projection display device is the same as that of the first embodiment, and therefore the description is omitted.
[0049]
Details of the operation of the shutter device will be described with reference to FIG. First, FIG. 9A shows a state of normal use (a state in which an image is projected on an external screen). At this time, the light shielding plate 52 is completely retracted from the optical path, and the sensor 54 can detect that the light shielding plate 52 is at that position.
[0050]
When the image mute is instructed, the display is changed to the all black display state, and the drive cam gear 57 starts rotating in the direction of the arrow K by a drive unit (not shown). The groove cam 55 provided on the drive cam gear 57 and the pin 51 of the light shielding plate 52 cooperate, and the light shielding plate 52 starts rotating in the direction of arrow M.
[0051]
After the state shown in FIG. 9B, the light shielding plate 52 is rotated until the light path from the DMD to the projection lens is completely interrupted, the position is detected by the sensor 53, and the driving means is stopped at the same time. In this state, the light shielding plate 52 stops.
[0052]
When returning to the normal use state, the drive cam gear 57 starts rotating in the direction of arrow L from the state shown in FIG. The groove cam 55 provided on the driving cam gear 57 and the pin 51 of the light shielding plate 52 cooperate, and the light shielding plate 52 starts rotating in the direction of arrow N.
[0053]
After the state shown in FIG. 9B, the light-shielding plate 52 is rotated until it completely retracts from the optical path from the DMD to the projection lens, the position is detected by the sensor 54, and the driving means is stopped at the same time. In this state, the light shielding plate 52 stops.
[0054]
In these operations, the cam curve of the groove cam 55 can be set arbitrarily. If the rotation speed of the light shielding plate 52 is set to be slow near (a) and (c) and fast near (b) when the driving cam gear 57 rotates at a constant speed, even if the stop timing is slightly before or after, The displacement of each stop position of the light shielding plate 52 can be minimized.
[0055]
The sensor is not limited to a contact type, and an optical sensor such as a photo interrupter can be used.
[0056]
Further, by using a driving source such as a stepping motor that can be stopped at an arbitrary rotation angle as a driving unit, the stop position can be controlled without using a sensor.
[0057]
Further, in the description of the second embodiment, the gear shape 56 of the driving cam gear 52 is provided on the entire circumference. However, by providing a toothless gear and adding an urging means, the failure of the sensors 53 and 54, the sensor Even if the position of the light-shielding plate 52 cannot be detected due to a short circuit of the wiring to 53 or 54 and the driving means continues to rotate, the light-shielding plate 52 can be stopped just before serious damage to the device. It is.
[0058]
Further, in the mechanism of the present description, the rotation speed of the light shielding plate 52 changes continuously in the movements of FIGS. 9A, 9B, and 9C, but becomes faster near the position of FIG. 9B. , (C), the rotation speed of the light shielding plate 52 may change stepwise.
[0059]
Further, in the present description, the hole of the drive cam gear 57 (the groove cam 55 in the description of the second embodiment) is used as the concave portion for driving the light shielding plate 52, but the groove may be engaged with the convex portion of the light shielding plate. Good.
[0060]
In each of the above embodiments, an example is shown in which one DMD is used as a light valve. However, the shutter device of the present invention can be used for an apparatus using a plurality of DMDs. .
[0061]
Further, the present invention can be similarly applied to a projection display device using a liquid crystal panel or another element as a light valve, and the same effect can be obtained.
[0062]
Although two contact type micro SWs are used for the sensors, the number of the sensors is not necessarily two, and the use of one can control the opposite position with time.
[0063]
【The invention's effect】
As described above, according to the present invention, it is possible to quickly move to a position where the light shielding plate blocks a predetermined optical path and a position where the light shielding plate does not block the optical path, and to reliably stop at a predetermined position.
[0064]
Further, even if there is an abnormality such as a failure of the detecting means or a short circuit of the wiring, no serious damage is given to the entire apparatus.
[0065]
In addition, the temperature rise of the light shielding plate can be suppressed to a minimum.
[Brief description of the drawings]
FIG. 1 is a perspective view of a shutter device according to a first embodiment of the present invention; FIG. 2 is an exploded view of the shutter device according to the first embodiment; FIG. 3 is an optical system of a projection display device according to the first embodiment; FIG. 4 is a cross-sectional view of a light shielding plate according to the first embodiment. FIG. 5 is an explanatory diagram of an operation of the shutter device according to the first embodiment. FIG. FIG. 7 is a cross-sectional view of a shutter device section of the projection display device according to the first embodiment. FIG. 8 is a perspective view of a light-shielding plate driving section of the shutter device according to the second embodiment of the present invention. FIG. 10 is an explanatory view of the operation of the shutter device according to the second embodiment. FIG. 10 is a perspective view of a conventional shutter device.
1 ... DMD
2 Projection lens 3 Shutter device 4 Illumination optical device 5 Arc tube 6 Concave mirror 7 Color wheel 8 Lens group 9 Reflecting mirror 11 ··· Support shaft 12 ··· Long hole 13 ··· Light shielding plates 14 and 15 ··· Sensor 16 ··· Support shaft 17 ··· Gear shape 18 and 19 ··· Negative shape 20 ··· Driving pin 21 ... Sector gear 22 ... Tension spring 23 ... Worm gear 24 ... DC motor 25 ... Worm wheel gear 26 ... Gear 27 ... Reduction gear 28 ... Illumination light 29 ... OFF Light 30 Reflecting mirror 31 Light receiving element 51 Pin 52 Light shielding plates 53 and 54 Sensor 55 Groove cam 56 Gear shape 57 Drive cam gear

Claims (9)

A light-shielding plate having a straight or curved concave portion, which can be moved to a first stop position that blocks a predetermined optical path and a second stop position that does not block the optical path, by rotating around a rotation support shaft,
A driving member having a driving convex portion engaged with the concave portion,
The light-shielding plate is rotated by the movement of the driving convex portion, and the driving convex portion rotates the light-shielding plate as approaching the first stop position, the second stop position, or both stop positions. A shutter drive that moves so that the speed decreases. A light-shielding plate having a convex portion, which is rotatable about a rotation support shaft and can be moved to a first stop position that blocks a predetermined optical path and a second stop position that does not block the optical path,
A driving member having a linear or curved driving concave portion engaged with the convex portion,
The light shielding plate is rotated by the movement of the driving concave portion, and the driving concave portion has a rotating speed of the light shielding plate that approaches the first stop position or the second stop position or both stop positions. A shutter drive that moves so as to decrease. A transmission type or reflection type light valve capable of optically modulating each pixel, and a projection lens for projecting light transmitted through or reflected from the light valve and enlarging and projecting an image of the light valve. Of projection display devices,
The light shielding plate is located between the light valve and the projection lens,
3. The light source according to claim 1, wherein the light source rotates around a rotation support shaft and moves to a first stop position where the light path from the light valve to the projection lens is interrupted and a second stop position where the light path is not interrupted. Shutter drive. The driving convex or the driving concave is moved by a gear mechanism,
At least one gear of the gear mechanism is a toothless gear that is disengaged from a mating gear when rotated by a predetermined rotation angle or more, and the gear mechanism idles even when its drive source continues to move. 3. The shutter driving device according to any one of 3. The said convex part and a driving convex part are urged | biased by the elastic body in the direction which goes away from the said 1st stop position and the said 2nd stop position in the said 1st stop position and the said 2nd stop position. 5. The shutter driving device according to any one of 4. A transmission or reflection light valve capable of optical modulation for each pixel, and a projection lens for projecting light transmitted through or reflected from the light valve, and enlarging and projecting an image of the light valve. Of the projection display device
A first stop position that is located between the light valve and the projection lens and that rotates around a rotation support shaft to block an optical path from the light valve to the projection lens; and a second stop position that does not block the optical path. In a shutter device having a light shielding plate that moves to
A shutter device, wherein the light reflectance of the light valve side surface of the light shielding plate is higher than the light reflectance of the projection lens side surface. The light shielding plate is a metal plate,
7. The shutter device according to claim 6, wherein the surface on the side of the projection lens is painted black. A light-shielding plate having a straight or curved concave portion, which can be moved to a first stop position that blocks a predetermined optical path and a second stop position that does not block the optical path, by rotating around a pivot shaft, A driving member having a driving projection engaged therewith, the driving method of the shutter device, comprising:
When the light-shielding plate is rotated by the movement of the driving projection, the rotation speed of the light-shielding plate decreases as approaching the first stop position, the second stop position, or both stop positions. And a method of driving a shutter device for moving the driving projection. A light-shielding plate having a convex portion that is rotatable about a rotation support shaft and that can move to a first stop position that blocks a predetermined optical path and a second stop position that does not block the optical path, and a straight line engaged with the convex portion Or a driving method of a shutter device including a driving member having a curved driving concave portion,
When rotating the light shielding plate by the movement of the driving concave portion, the rotation speed of the light shielding plate decreases as approaching the first stop position or the second stop position or both stop positions, A driving method of a shutter device for moving the driving recess.

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