JP2020008630A - Optical device, optical element, image projection device, and imaging apparatus - Google Patents

Abstract

To provide an optical device that can reduce collision noise even when supply of power is suddenly stopped.SOLUTION: An optical device according to one aspect of the disclosed technology comprises: a driving unit that is supplied with power and moves an optical element with an electromagnetic force; a power circuit that supplies a power to the driving unit; a detection unit that detects the voltage or the current of the power circuit; and a power holding unit that holds a predetermined amount of power, and when the voltage or the current is equal to or less than a predetermined threshold, supplies a power to the driving unit.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an optical device, an optical element, an image projection device, and an imaging device.

  2. Description of the Related Art Optical devices such as an image projection device and a camera that move an image forming element such as a DMD (Digital Micromirror Device) or a lens by generating an electromagnetic force by flowing a current through a coil, and a camera are known.

  In such an optical device, when the power is turned off, the holding force of the DMD or the lens is released, the device falls down by its own weight, and a loud metal sound or the like is generated by a collision, which may give a user discomfort. Was.

  In contrast, when the power of an optical device such as a camera is turned off, the lens is gradually moved closer to the inner wall below the lens barrel, thereby avoiding the sound of collision between the lens and the lens barrel. An apparatus for performing the above is disclosed (for example, see Patent Document 1).

  In the device described in Patent Literature 1, when the power is turned off by a switch included in the optical device, the lens can be gradually approached to the inner wall below the lens barrel. However, when power is suddenly stopped to be supplied due to a lack of charge of a battery, a power failure, or the like, a lens may fall and collide with a lens barrel, and a collision sound may be generated.

  The present invention has been made in view of the above points, and has as its object to provide an optical device that can reduce collision noise even when power is suddenly stopped.

  An optical device according to one embodiment of the disclosed technology is supplied with power, a driving portion that moves an optical element by electromagnetic force, a power supply circuit that supplies power to the driving portion, and a voltage or current of the power supply circuit. It has a detecting unit for detecting, and a power holding unit that holds a predetermined amount of power and supplies power to the driving unit when the voltage or the current is equal to or less than a predetermined threshold.

  According to the disclosed technology, it is possible to provide an optical device that can reduce collision noise even when power is suddenly stopped.

FIG. 2 is a diagram illustrating an image projection device according to the first embodiment. FIG. 2 is a block diagram illustrating a functional configuration of the image projection device according to the first embodiment. FIG. 2 is a perspective view illustrating an optical engine of the image projection device according to the first embodiment. It is a sectional view showing an example of composition of an illumination optical system unit and a projection optical system unit concerning a 1st embodiment. FIG. 2 is a perspective view illustrating the image display unit according to the first embodiment. FIG. 2 is a side view illustrating the image display unit according to the first embodiment. FIG. 2 is a perspective view illustrating a fixing unit according to the first embodiment. FIG. 2 is an exploded perspective view illustrating the fixing unit according to the first embodiment. It is a figure explaining the support structure of the movable plate by the fixed unit concerning a 1st embodiment. FIG. 3 is a partially enlarged view illustrating a support structure of a movable plate by a fixed unit according to the first embodiment. FIG. 3 is a bottom view illustrating the top cover according to the first embodiment. FIG. 2 is a perspective view illustrating a movable unit according to the first embodiment. FIG. 2 is an exploded perspective view illustrating the movable unit according to the first embodiment. FIG. 2 is a perspective view illustrating a movable plate according to the first embodiment. It is a perspective view which illustrates the movable unit from which the movable plate concerning 1st Embodiment was removed. It is a figure explaining DMD holding structure of a movable unit concerning a 1st embodiment. 5 is a flowchart illustrating a process of a system control unit according to the first embodiment. FIG. 9 is a diagram illustrating a configuration of an imaging device according to a second embodiment. It is a block diagram which illustrates the functional composition of the imaging device concerning a 2nd embodiment.

  Hereinafter, embodiments for carrying out the invention will be described with reference to the drawings. In the drawings, the same components are denoted by the same reference numerals, and redundant description may be omitted.

[First Embodiment]
In the present embodiment, an image projection device will be described as an example of an optical device.

<Configuration of image projection device>
FIG. 1 shows an example of an appearance of an image projection device 1 according to the present embodiment. (A) is a perspective view of the appearance, and (b) is a side view of the image projection device 1 in a projection state.

  The image projection apparatus 1 has an optical engine for generating a projection image provided therein, and has an emission window 2, an intake port 3, an exhaust port 4, a main body operation unit 5, and an image input terminal 6. When image data is transmitted from, for example, a personal computer or a digital camera connected to the image input terminal 6, the image projection device 1 generates a projection image based on the transmitted image data, and as shown in FIG. An image is projected from the exit window 2 onto the screen S.

  The main body operation unit 5 has operation buttons 5a to 5d, and receives an operation on the image projection device 1 through the operation buttons 5a to 5d. For example, as illustrated, the operation buttons 5a to 5d are provided on the upper surface of the image projection device 1. However, the present invention is not limited to this. For example, the main body operation unit 5 may be configured by a liquid crystal display device or an organic EL display device having a touch panel function.

  The main body operation unit 5 receives user operations such as turning on / off a power supply or adjusting the size, position, color tone, and focus of a projected image. The user operation received by the main body operation unit 5 is sent to the system control unit.

  In the drawings shown below, the X1X2 direction indicates the width direction of the image projection device 1, the Y1Y2 direction indicates the depth direction of the image projection device 1, and the Z1Z2 direction indicates the height direction of the image projection device 1. In addition, hereinafter, the exit window 2 side of the image projection device 1 may be described as an upper side and the opposite side to the exit window 2 as a lower side.

  The image projection device 1 projects an image having a projection distance of 1 to 2 m and a size of 60 to 80 inches, for example. A large screen image can be projected from a short distance from the screen S, and the space behind the image projection device 1 can be freely used. Since the image projection device 1 houses a light source lamp and a large number of electronic boards inside, the internal temperature of the image projection device 1 increases with time after startup. This becomes more remarkable as the size of the image projection device is reduced. Therefore, the image projection device 1 is provided with the intake port 3 and the exhaust port 4, and the inside of the image projection device 1 is air-cooled by forced airflow.

  Next, FIG. 2 is a block diagram illustrating a functional configuration of the image projection device 1 of the present embodiment.

  As shown in FIG. 2, the image projection device 1 includes a remote control (Remote Control) light receiving unit 7, a power supply circuit 8, a switch 9, a system control unit 10, a power holding unit 13, a notification unit 14, It has a fan 20 and an optical engine 15.

  Remote control light receiving section 7 receives an operation on image projection device 1 by remote control 71.

  The power supply circuit 8 is connected to a commercial power supply, converts a voltage input from the commercial power supply into a voltage and a frequency for an internal circuit of the image projection apparatus 1, outputs the converted voltage and frequency to the system control unit 10, and supplies power.

  The switch 9 is used for an ON / OFF operation of the image projection device 1 by a user. When the switch 9 is turned on in a state where the power supply circuit 8 is connected to a commercial power supply via a power cord or the like, the power supply circuit 8 starts supplying power to each unit of the image projection apparatus 1. On the other hand, when the switch 9 is turned off, the power supply circuit 8 stops supplying power to each part of the image projection apparatus 1.

  When the power button provided on the main body operation unit 5 is pressed down during the operation of the image projection device 1, the system control unit 10 shifts the image projection device 1 to the stop mode. Alternatively, when it is determined that the remote control light-receiving unit 7 has received the power-off signal from the remote control 71, the system control unit 10 shifts the image projection device 1 to the stop mode. After shifting to the stop mode, the image projection device 1 stops supplying power to the system control unit 10 and the like, and turns off the power. The stop mode is a mode in which power supply to each unit is stopped sequentially or simultaneously when the power of the image projection apparatus 1 is turned off. In the stop mode, a message for asking the user whether to turn off the power may be displayed on the projection image.

  The power supply circuit 8 has a detection unit 81. The detection unit 81 detects the input voltage to the power supply circuit 8 and outputs a signal notifying the system control unit 10 when the input voltage is equal to or lower than the threshold. For simplification of description, this signal may be referred to as a “notification signal” below. The system control unit 10 shifts the image projection device 1 to the stop mode according to the notification signal. The detection unit 81 is realized by, for example, an electric circuit or the like provided in the power supply circuit 8.

  Note that the detection unit 81 may detect an input current to the power supply circuit 8 and output a notification signal to the system control unit 10 when the input current is equal to or less than the threshold. The detection unit 81 may detect a voltage or a current output from the power supply circuit 8 and output a notification signal to the system control unit 10 when the output voltage or the output current is equal to or less than a threshold. In view of these, the input voltage, input current, output voltage, or output current detected by the detection unit 81 may be hereinafter referred to as “input voltage or the like”.

  The system control unit 10 includes an image control unit 11 and a movement control unit 12. The system control unit 10 includes, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), and the like. The CPU executes a program stored in the ROM in cooperation with the RAM. Thus, the function of each unit is realized.

  The image control unit 11 is a digital micromirror device (hereinafter simply referred to as “DMD”) provided in the image display unit 50 of the optical engine 15 based on image data input from the image input terminal 6. ) Is controlled to generate an image to be projected on the screen S. The DMD 551 is an example of an “optical element” and an example of an “image forming element”.

  The movement control unit 12 moves the movable unit 55 movably provided in the image display unit 50, and controls the position of the DMD 551 provided in the movable unit 55. Note that the movable unit 55 is an example of a “drive unit”.

  In the present embodiment, the DMD 551 is installed inside the image projection device 1 such that the plane portion is substantially parallel to the vertical direction. The movable unit 55 is installed inside the image projection device 1 so as to be movable in the vertical direction. However, without being limited to this, the DMD 551 may be installed such that the plane portion is inclined in the vertical direction. The movable unit 55 may be installed so as to be movable in a direction inclined in the vertical direction. The movable unit 55 can move the DMD 551 in a direction including the vertical direction.

  The power holding unit 13 holds a predetermined amount of power. When the detection unit 81 outputs the notification signal, the power holding unit 13 supplies power to the system control unit 10 and the like, and enables the movable unit 55 to move the DMD 551. A storage battery such as a lithium ion battery can be used for the power holding unit 13. However, the present invention is not limited to this, and a capacitor or the like may be used. Note that the capacitor is a so-called capacitor, and is a capacitor mainly using activated carbon and barium titanate.

  The power holding unit 13 is charged by the power supplied from the power supply circuit 8 when the image projection apparatus 1 is operating and the input voltage or the like to the power supply circuit 8 is not lower than the threshold.

  The notification unit 14 receives the notification signal output by the detection unit 81. Alternatively, the notification unit 14 inputs the notification signal output by the detection unit 81 via the system control unit 10. The notification unit 14 notifies the user that the input voltage or the like is equal to or less than the threshold value in response to the notification signal. This notification may be made by sounding a warning sound or by displaying a message on a projection image projected by the image projection device 1 on the screen S.

  The functions of the detection unit 81, the power holding unit 13, and the movement control unit 12 will be described in detail separately.

  The fan 20 rotates under the control of the system control unit 10 to cool the light source 30 of the optical engine 15.

  The optical engine 15 includes a light source 30, an illumination optical system unit 40, an image display unit 50, and a projection optical system unit 60, and projects an image on the screen S under the control of the system control unit 10.

  The light source 30 is, for example, a mercury high-pressure lamp, a xenon lamp, an LED, or the like, and is controlled by the system control unit 10 to irradiate the illumination optical system unit 40 with light.

  The illumination optical system unit 40 has, for example, a color wheel, a light tunnel, a relay lens, and the like, and guides light emitted from the light source 30 to the DMD 551 provided in the image display unit 50.

  The image display unit 50 has a fixed unit 51 fixedly supported and a movable unit 55 provided movably with respect to the fixed unit 51. The movable unit 55 has a DMD 551, and the position of the movable unit 55 with respect to the fixed unit 51 is controlled by the movement control unit 12 of the system control unit 10. The DMD 551 is controlled by the image controller 11 of the system controller 10, modulates the light guided by the illumination optical system unit 40, and generates a projection image.

  The projection optical system unit 60 has, for example, a plurality of projection lenses, mirrors, and the like, and enlarges an image generated by the DMD 551 of the image display unit 50 and projects the image on the screen S.

<Configuration of optical engine>
Next, the configuration of each part of the optical engine 15 of the image projection device 1 will be described.

  FIG. 3 is a diagram illustrating an example of a configuration of the optical engine 15 of the image projection device 1. FIG. 3 shows a state in which the outer cover of the image projection device 1 is removed and the optical engine 15 and the like inside the image projection device 1 can be observed. FIG. 3A shows the entire configuration of the optical engine 15, and FIG. 3B shows a configuration in which a portion surrounded by a circle in FIG.

  In the present embodiment, the optical engine 15 includes a light source 30, an illumination optical system unit 40, an image display unit 50, and a projection optical system unit 60. The white light emitted from the light source 30 is applied to the illumination optical system unit 40. In the illumination optical system unit 40, white light is split into red (R), green (G), and blue (B). The split light of each color is guided to the image display unit 50 and modulated by the image display unit 50 to generate a projection image. The projection image is enlarged and projected on the screen by the projection optical system unit 60.

  A forced airflow is generated by an intake fan 3a arranged near the intake port 3 and an exhaust fan 4a arranged near the exhaust port 4, and the inside of the image projection device 1 is air-cooled.

<Structure of illumination and projection optical system unit>
Next, the configuration of the illumination and projection optical system unit will be described.

  FIG. 4 is a cross-sectional view illustrating an example of the configuration of the illumination optical system unit 40 and the projection optical system unit 60.

  The illumination optical system unit 40 has a color wheel 41, a light tunnel 42, a relay lens 43, a plane mirror 44, and a concave mirror 45. The white light from the light source 30 is split into light of each color by a color wheel 41 which is a rotating body in which red (R), green (G), and blue (B) are laid in a circumferential direction, and is separated into light tunnels 42. Be guided.

  The light tunnel 42 is a cylindrical member having a hollow inside. Light of each color guided to the light tunnel 42 is repeatedly reflected inside the light tunnel 42, so that the illuminance distribution becomes uniform at the exit of the light tunnel 42. That is, the light tunnel 42 has a function as illuminance uniforming means for reducing the unevenness in the amount of each illumination light.

  The light emitted from the light tunnel 42 has its chromatic aberration corrected by the relay lens 43 composed of two lenses, and is illuminated on the DMD 551 by the plane mirror 44 and the concave mirror 45.

  The DMD 551 has a micromirror for each pixel, and each micromirror can maintain a state at any one of two different angles. Each micromirror of the DMD 551 reflects an angle (ON state) that reflects each illumination light toward the projection optical system unit 60 and an angle (OFF state) that reflects each illumination light toward the internal absorber and does not emit it to the outside. ). This makes it possible to control the light emitted to the projection optical system unit 60 for each pixel to be displayed.

  The projection optical system unit 60 includes a plurality of projection lenses, and enlarges and projects the light from the DMD 551 onto the screen S.

  The relay lens 43, the plane mirror 44, the concave mirror 45, and the DMD 551, and the part of the projection optical system unit 60 on the incident side of the illumination light are held by the housing so as to cover the respective components. It has a dust-proof structure sealed with a sealing material.

<Image display unit>
FIG. 5 is a perspective view illustrating the image display unit 50 of the present embodiment. FIG. 6 is a side view illustrating the image display unit 50 of the present embodiment.

  As shown in FIGS. 5 and 6, the image display unit 50 has a fixed unit 51 fixedly supported and a movable unit 55 provided movably with respect to the fixed unit 51.

  The fixing unit 51 has a top plate 511 as a first fixing plate and a base plate 512 as a second fixing plate. The fixing unit 51 has a top plate 511 and a base plate 512 provided in parallel with a predetermined gap therebetween, and is fixed below the illumination optical system unit 40.

  The movable unit 55 has a DMD 551, a movable plate 552 as a first movable plate, a coupling plate 553 as a second movable plate, and a heat sink 554, and is movably supported by the fixed unit 51.

  The movable plate 552 is provided between the top plate 511 and the base plate 512 of the fixed unit 51, and is supported by the fixed unit 51 so as to be movable in a direction parallel to the top plate 511 and the base plate 512 and parallel to the surface.

  The coupling plate 553 is fixed to the movable plate 552 with the base plate 512 of the fixed unit 51 interposed therebetween. In the coupling plate 553, the DMD 551 is fixedly provided on the upper surface side, and the heat sink 554 is fixed on the lower surface side. The coupling plate 553 is fixed to the movable plate 552, and is movably supported by the fixed unit 51 together with the movable plate 552, the DMD 551, and the heat sink 554.

  The DMD 551 is provided on a surface of the coupling plate 553 on the movable plate 552 side, and is provided so as to be movable together with the movable plate 552 and the coupling plate 553. The DMD 551 has an image generating surface on which a plurality of movable micromirrors are arranged in a lattice. Each micromirror of the DMD 551 is provided with a mirror surface capable of tilting around a torsion axis, and is driven ON / OFF based on an image signal transmitted from the image control unit 11 of the system control unit 10.

  When the micromirror is, for example, “ON”, the tilt angle is controlled so that the light from the light source 30 is reflected to the projection optical system unit 60. When the micromirror is OFF, for example, the tilt angle is controlled in a direction in which light from the light source 30 is reflected toward an OFF light plate (not shown).

  As described above, the DMD 551 controls the tilt angle of each micromirror by the image signal transmitted from the image control unit 11, modulates the light emitted from the light source 30 and passed through the illumination optical system unit 40, and modulates the projected image. Generate.

  The heat sink 554 is an example of a heat radiating unit, and is provided so that at least a part thereof contacts the DMD 551. Since the heat sink 554 is provided together with the DMD 551 on the movably supported coupling plate 553, the heat sink 554 can be efficiently cooled by contacting the DMD 551. With such a configuration, in the image projection device 1 according to the present embodiment, the heat sink 554 suppresses a rise in the temperature of the DMD 551, and occurrence of a malfunction such as an operation failure or a failure due to the rise in the temperature of the DMD 551 is reduced.

(Fixed unit)
FIG. 7 is a perspective view illustrating the fixing unit 51 of the present embodiment. FIG. 8 is an exploded perspective view illustrating the fixing unit 51 of the present embodiment.

  As shown in FIGS. 7 and 8, the fixing unit 51 has a top plate 511 and a base plate 512.

  The top plate 511 and the base plate 512 are formed from a plate-shaped member, and have central holes 513 and 514 at positions corresponding to the DMD 551 of the movable unit 55, respectively. The top plate 511 and the base plate 512 are provided in parallel by a plurality of columns 515 with a predetermined gap therebetween.

  As shown in FIG. 8, the support 515 has an upper end press-fitted into a support hole 516 formed in the top plate 511 and a lower end formed with a male screw groove formed in the base plate 512. Is inserted into. The support column 515 forms a certain distance between the top plate 511 and the base plate 512, and supports the top plate 511 and the base plate 512 in parallel.

  Further, a plurality of support holes 522 and 526 for rotatably holding the support sphere 521 are formed in the top plate 511 and the base plate 512, respectively.

  A cylindrical holding member 523 having a female screw groove on the inner peripheral surface is inserted into the support hole 522 of the top plate 511. The holding member 523 rotatably holds the support sphere 521, and the position adjusting screw 524 is inserted from above. The lower end side of the support hole 526 of the base plate 512 is closed by a lid member 527 to hold the support sphere 521 rotatably.

  The support spheres 521 rotatably held in the support holes 522 and 526 of the top plate 511 and the base plate 512 abut on a movable plate 552 provided between the top plate 511 and the base plate 512, respectively, and can move the movable plate 552. To support.

  FIG. 9 is a diagram for describing a support structure of the movable plate 552 by the fixed unit 51 of the present embodiment. FIG. 10 is a partially enlarged view illustrating the schematic configuration of the portion A shown in FIG.

  As shown in FIGS. 9 and 10, in the top plate 511, the support sphere 521 is rotatably held by a holding member 523 inserted into the support hole 522. In the base plate 512, the support sphere 521 is rotatably held by a support hole 526 whose lower end is closed by a cover member 527.

  Each support sphere 521 is held so that at least a part thereof protrudes from the support holes 522 and 526, and abuts and supports a movable plate 552 provided between the top plate 511 and the base plate 512. The movable plate 552 is supported from both sides by a plurality of rotatably provided support spheres 521 so as to be movable in a direction parallel to the top plate 511 and the base plate 512 and parallel to the surface.

  In addition, the amount of protrusion of the support sphere 521 provided on the top plate 511 side from the lower end of the holding member 523 changes according to the position of the position adjustment screw 524 that abuts on the opposite side to the movable plate 552. For example, when the position adjusting screw 524 is displaced in the Z1 direction, the amount of protrusion of the support sphere 521 decreases, and the distance between the top plate 511 and the movable plate 552 decreases. Further, for example, when the position adjusting screw 524 is displaced in the Z2 direction, the amount of protrusion of the support sphere 521 increases, and the distance between the top plate 511 and the movable plate 552 increases.

  As described above, the distance between the top plate 511 and the movable plate 552 can be appropriately adjusted by changing the amount of protrusion of the support sphere 521 using the position adjustment screw 524.

  As shown in FIGS. 7 and 8, magnets 531, 532, 533, and 534 are provided on the surface of the top plate 511 on the base plate 512 side.

  FIG. 11 is a bottom view illustrating the top plate 511 of the present embodiment. As shown in FIG. 11, magnets 531, 532, 533, and 534 are provided on the surface of the top plate 511 on the base plate 512 side.

  The magnets 531, 532, 533 and 534 are provided at four locations so as to surround the central hole 513 of the top plate 511. The magnets 531, 532, 533, and 534 are each composed of two rectangular parallelepiped magnets arranged so that their longitudinal directions are parallel to each other, and each form a magnetic field that reaches the movable plate 552.

  The magnets 531, 532, 533, and 534 form a moving unit that moves the movable plate 552 with coils provided on the upper surface of the movable plate 552 so as to face the magnets 531, 532, 533, 534.

  In addition, the number, the position, and the like of the columns 515 and the support spheres 521 provided in the fixed unit 51 described above need only be able to movably support the movable plate 552, and are not limited to the configuration illustrated in the present embodiment.

(Movable unit)
FIG. 12 is a perspective view illustrating the movable unit 55 of the present embodiment. FIG. 13 is an exploded perspective view illustrating the movable unit 55 of the present embodiment.

  As shown in FIGS. 12 and 13, the movable unit 55 has a DMD 551, a movable plate 552, a coupling plate 553, a heat sink 554, a holding member 555, and a DMD substrate 557, and is movably supported by the fixed unit 51. Have been.

  As described above, the movable plate 552 is provided between the top plate 511 and the base plate 512 of the fixed unit 51, and is supported by the plurality of support spheres 521 so as to be movable in a direction parallel to the surface.

  FIG. 14 is a perspective view illustrating the movable plate 552 of the present embodiment.

  As shown in FIG. 14, the movable plate 552 is formed of a plate-shaped member, has a central hole 570 at a position corresponding to the DMD 551 provided on the DMD substrate 557, and has coils 581, 582 around the central hole 570. , 583 and 584 are provided.

  Each of the coils 581, 582, 583, and 584 is formed by winding an electric wire around an axis parallel to the Z1Z2 direction, and is provided in a concave portion formed on a surface of the movable plate 552 on the top plate 511 side. Covered with a cover. The coils 581, 582, 583, and 584 form a moving unit that moves the movable plate 552 with the magnets 531, 532, 533, and 534 of the top plate 511, respectively.

  The magnets 531, 532, 533 and 534 of the top plate 511 and the coils 581, 582, 583 and 584 of the movable plate 552 are provided at positions facing each other in a state where the movable unit 55 is supported by the fixed unit 51. ing. When a current flows through the coils 581, 582, 583, and 584, a Lorentz force that is a driving force for moving the movable plate 552 is generated by a magnetic field formed by the magnets 531, 532, 533, and 534. The Lorentz force is an example of “electromagnetic force”.

  The movable plate 552 receives a Lorentz force as a driving force generated between the magnets 531, 532, 533, and 534 and the coils 581, 582, 583, and 584, and moves linearly in the XY plane with respect to the fixed unit 51. Or, it is displaced so as to rotate.

  The magnitude and direction of the current flowing through each of the coils 581, 582, 583, and 584 are controlled by the movement control unit 12 of the system control unit 10. The movement control unit 12 controls the movement (rotation) direction, movement amount, rotation angle, and the like of the movable plate 552 based on the magnitude and direction of the current flowing through each of the coils 581, 582, 583, and 584.

  In the present embodiment, a coil 581 and a magnet 531 and a coil 584 and a magnet 534 are provided as first driving units so as to face each other in the X1X2 direction. When a current flows through the coil 581 and the coil 584, a Lorentz force in the X1 direction or X2 is generated as shown in FIG. The movable plate 552 moves in the X1 direction or the X2 direction by Lorentz force generated in the coil 581 and the magnet 531 and the coil 584 and the magnet 534.

  In the present embodiment, a coil 582 and a magnet 532, and a coil 583 and a magnet 533 are provided side by side in the X1X2 direction as a second driving unit, and the magnets 532 and 533 are different from the magnets 531 and 534. They are arranged so that their longitudinal directions are orthogonal. In such a configuration, when a current flows through the coil 582 and the coil 583, a Lorentz force in the Y1 direction or the Y2 direction is generated as shown in FIG.

  The movable plate 552 moves in the Y1 direction or the Y2 direction by Lorentz force generated in the coil 582 and the magnet 532 and the coil 583 and the magnet 533. The movable plate 552 is displaced so as to rotate on the XY plane by Lorentz force generated in the opposite direction between the coil 582 and the magnet 532 and the coil 583 and the magnet 533.

  For example, when a current flows so that a Lorentz force in the Y1 direction is generated in the coil 582 and the magnet 532 and a Lorentz force in the Y2 direction is generated in the coil 583 and the magnet 533, the movable plate 552 moves clockwise in a top view. Displace to rotate. When a current flows so that a Lorentz force in the Y2 direction is generated in the coil 582 and the magnet 532 and a Lorentz force in the Y1 direction is generated in the coil 583 and the magnet 533, the movable plate 552 rotates counterclockwise in top view. Displace to rotate in the direction.

  The movable plate 552 is provided with a movable range limiting hole 571 at a position corresponding to the column 515 of the fixed unit 51. The movable range limiting hole 571 limits the movable range of the movable plate 552 by contacting the support 515 when the support 515 of the fixed unit 51 is inserted and the movable plate 552 moves significantly due to, for example, vibration or some abnormality.

  As described above, in the present embodiment, the movement control unit 12 of the system control unit 10 controls the magnitude and direction of the current flowing through the coils 581, 582, 583, and 584, so that the movable plate within the movable range. 552 can be moved to any position.

  The number, position, etc. of the magnets 531, 532, 533, 534 and coils 581, 582, 583, 584 as the moving means are determined in the present embodiment as long as the movable plate 552 can be moved to any position. The configuration may be different from that described above. For example, the magnet as a moving unit may be provided on the upper surface of the top plate 511, or may be provided on any surface of the base plate 512. Further, for example, a magnet may be provided on the movable plate 552, and a coil may be provided on the top plate 511 or the base plate 512.

  Further, the number, position, shape, and the like of the movable range restriction holes 571 are not limited to the configuration illustrated in the present embodiment. For example, the number of the movable range limiting holes 571 may be one or more. In addition, the shape of the movable range restriction hole 571 may be a shape different from that of the present embodiment, such as a rectangle or a circle.

  As shown in FIG. 12, a coupling plate 553 is fixed to the lower surface side (the base plate 512 side) of the movable plate 552 movably supported by the fixing unit 51. The coupling plate 553 is formed of a flat plate member, has a central hole at a position corresponding to the DMD 551, and a bent portion provided around the coupling plate 553 is fixed to the lower surface of the movable plate 552 by three screws 591.

  FIG. 15 is a perspective view illustrating the movable unit 55 with the movable plate 552 removed.

  As shown in FIG. 15, the coupling plate 553 is provided with a DMD 551 on the upper surface side and a heat sink 554 on the lower surface side. The coupling plate 553 is fixed to the movable plate 552 so as to be movable with the movable plate 552 together with the DMD 551 and the heat sink 554 with respect to the fixed unit 51.

  The DMD 551 is provided on the DMD substrate 557, and is fixed to the coupling plate 553 by the DMD substrate 557 being sandwiched between the holding member 555 and the coupling plate 553. As shown in FIGS. 13 and 15, the holding member 555, the DMD board 557, the coupling plate 553, and the heat sink 554 are overlapped and fixed by a stepped screw 560 as a fixing member and a spring 561 as pressing means.

  FIG. 16 is a diagram illustrating a DMD holding structure of the movable unit 55 according to the present embodiment. FIG. 16 is a side view of the movable unit 55, in which the movable plate 552 and the coupling plate 553 are not shown.

  As shown in FIG. 16, the heat sink 554 has a protrusion 554a that is fixed to the coupling plate 553 and that comes into contact with the lower surface of the DMD 551 from a through hole provided in the DMD substrate 557. Note that the protrusion 554a of the heat sink 554 may be provided so as to abut on a lower surface of the DMD substrate 557 and at a position corresponding to the DMD 551.

  Further, in order to enhance the cooling effect of the DMD 551, an elastically deformable heat transfer sheet may be provided between the protrusion 554a of the heat sink 554 and the DMD 551. The heat transfer sheet improves the thermal conductivity between the protrusion 554 a of the heat sink 554 and the DMD 551, and improves the cooling effect of the heat sink 554 on the DMD 551.

  As described above, the holding member 555, the DMD board 557, and the heat sink 554 are overlapped and fixed by the stepped screw 560 and the spring 561. When the stepped screw 560 is tightened, the spring 561 is compressed in the Z1Z2 direction, and a force F1 in the Z1 direction shown in FIG. Due to the force F1 generated by the spring 561, the heat sink 554 is pressed against the DMD 551 by the force F2 in the Z1 direction.

  In the present embodiment, the stepped screw 560 and the spring 561 are provided at four positions, and the force F2 applied to the heat sink 554 is equal to the sum of the forces F1 generated in the four springs 561. The force F2 from the heat sink 554 acts on the holding member 555 that holds the DMD substrate 557 on which the DMD 551 is provided. As a result, a reaction force F3 in the Z2 direction corresponding to the force F2 from the heat sink 554 is generated in the holding member 555, and the DMD substrate 557 can be held between the holding member 555 and the coupling plate 553.

  A force F4 in the Z2 direction acts on the stepped screw 560 and the spring 561 from the force F3 generated on the holding member 555. Since the springs 561 are provided at four positions, the force F4 acting on each of them corresponds to one-fourth of the force F3 generated in the holding member 555, and is balanced with the force F1.

  The holding member 555 is a member that can bend as shown by an arrow B in FIG. The holding member 555 is pressed by the protruding portion 554a of the heat sink 554 to bend and generate a force for pushing the heat sink 554 back in the Z2 direction, so that the contact between the DMD 551 and the heat sink 554 can be more firmly maintained.

  As described above, in the movable unit 55, the movable plate 552 and the coupling plate 553 having the DMD 551 and the heat sink 554 are movably supported by the fixed unit 51. The position of the movable unit 55 is controlled by the movement control unit 12 of the system control unit 10. In addition, the movable unit 55 is provided with a heat sink 554 that is in contact with the DMD 551, thereby preventing a malfunction such as a malfunction or a failure due to a temperature rise of the DMD 551.

<Image projection>
As described above, in the image projection device 1 according to the present embodiment, the DMD 551 that generates the projection image is provided in the movable unit 55, and the position is controlled together with the movable unit 55 by the movement control unit 12 of the system control unit 10. Is done.

  The movement control unit 12 moves the movable unit 55 at high speed between a plurality of positions separated by a distance less than the arrangement interval of the plurality of micromirrors of the DMD 551 at a predetermined cycle corresponding to the frame rate during image projection. Control the position of. At this time, the image control unit 11 transmits an image signal to the DMD 551 so as to generate a projected image shifted according to each position.

  For example, the movement control unit 12 reciprocally shifts the DMD 551 at a predetermined cycle between a position P1 and a position P2 separated by a distance smaller than the arrangement interval of the micro mirrors of the DMD 551 in the X1X2 direction and the Y1Y2 direction. At this time, the image control unit 11 controls the DMD 551 so as to generate a projected image shifted according to each position, so that the resolution of the projected image can be approximately twice the resolution of the DMD 551. Become. Further, by increasing the moving position of the DMD 551, the resolution of the projected image can be made twice or more that of the DMD 551.

  As described above, the movement control unit 12 moves the DMD 551 together with the movable unit 55 at a predetermined cycle, and the image control unit 11 causes the DMD 551 to generate a projection image corresponding to the position, thereby projecting an image having a resolution higher than the resolution of the DMD 551. It becomes possible. Such a function is referred to as “pixel shift”.

  Further, in the image projection device 1 according to the present embodiment, the movement control unit 12 controls the DMD 551 to rotate together with the movable unit 55, so that the projection image can be rotated without being reduced. For example, in an image projection apparatus in which an image generation unit such as DMD551 is fixed, unless the projected image is reduced, the projected image cannot be rotated while maintaining the aspect ratio. On the other hand, in the image projection device 1 according to the present embodiment, since the DMD 551 can be rotated, it is possible to adjust the inclination and the like by rotating the projection image without reducing it.

  As described above, in the image projection device 1 according to the present embodiment, the DMD 551 is configured to be movable, so that the resolution of the projection image can be increased. Further, since the heat sink 554 for cooling the DMD 551 is mounted on the movable unit 55 together with the DMD 551, the DMD 551 can be cooled more efficiently by contacting the DMD 551, and the temperature rise of the DMD 551 is suppressed. Therefore, in the image projection device 1, malfunctions such as malfunctions and failures caused by the temperature rise of the DMD 551 are reduced.

<Control when input voltage to power supply is below threshold>
As described above, in the present embodiment, the DMD 551 is installed inside the image projection device 1 such that the plane portion is substantially parallel to the vertical direction. The movable unit 55 is installed inside the image projection device 1 so as to be movable in the vertical direction. The movable unit 55 can move the DMD 551 in a direction including the vertical direction.

  For example, when the supply of power to the image projection apparatus 1 is suddenly stopped due to a power failure or the like, the driving force (Lorentz force) does not work on the movable unit 55, and the movable unit 55 can stop in the vertical direction due to its own weight. Disappears. The movable unit 55 may fall by its own weight, collide with the fixed unit 51, and generate a loud collision sound. For example, when the movable unit 55 includes the heat sink 554, the movable unit 55 becomes heavier, so that the collision with the fixed unit 51 due to the drop becomes more intense, and the collision noise increases. Such a collision sound gives the user discomfort.

  Returning to FIG. 2, in the present embodiment, the detection unit 81 detects an input voltage or the like to the power supply circuit 8, and when the input voltage or the like is equal to or less than the threshold value, a signal (notification signal) notifying the system control unit 10 of that. ) Is output. As such a threshold, a lower limit of an input voltage or the like for generating a Lorentz force at which the movable unit 55 can stand still in the vertical direction is obtained in advance and stored in a ROM or the like. The detection unit 81 acquires a threshold value by referring to a ROM or the like.

  The system control unit 10 shifts the image projection device 1 to the stop mode according to the notification signal. Further, the movement control unit 12 moves the movable unit 55 to the initial position at a predetermined speed.

  The predetermined speed is, for example, a speed lower than the speed at which the movable unit 55 freely falls under its own weight. Such a speed is obtained in advance based on the weight of the movable unit 55 and the like, and is stored as a predetermined speed in a ROM or the like. The weight of the movable unit 55 may include the weight of the DMD 551, the heat sink 554, and the like included in the movable unit 55.

  When the input voltage or the like to the power supply circuit 8 is equal to or less than the threshold, the movement control unit 12 acquires a predetermined speed by referring to the ROM and the like, and moves the movable unit 55 at a predetermined speed. The initial position is, for example, an initial position where the DMD 551 is arranged when the image projection device 1 is activated. The “start-up” is, for example, when the user operates the switch 9 and the power supply circuit 8 starts supplying power to each unit of the image projection apparatus 1.

  In the present embodiment, when the supply of power to the image projection apparatus 1 is suddenly stopped due to a power failure or the like, the movable unit 55 can move at a speed lower than the speed at which the movable unit 55 freely falls under its own weight. As a result, even when the movable unit 55 hits the fixed unit 51, no loud collision sound is generated. Therefore, a loud collision sound when the movable unit 55 falls and collides with the fixed unit 51 can be avoided.

  The power holding unit 13 holds power for the movable unit 55 to move as described above. When the input voltage or the like to the power supply circuit 8 detected by the detection unit 81 is equal to or less than the threshold, the power holding unit 13 supplies power to the system control unit 10 and the like to enable the movable unit 55 to move.

  The amount of power held by the power holding unit 13 may be at least the amount of power required to move the DMD 551 to the initial position at a speed lower than the speed at which the movable unit 55 freely falls under its own weight. Such an amount of power is obtained in advance based on the weight of the movable unit 55 and the like, and a storage battery, a capacitor, or the like that can hold a necessary amount of power is selected and used.

  In the stop mode, it is sufficient that at least a driving force for moving the movable unit 55 to the initial position can be generated. Therefore, the image projection device 1 may include a power supply unit instead of the power holding unit 13. The power supply unit supplies power to the system control unit 10 and the like by wireless power supply, for example. Note that the wireless power supply includes a pair of coils, and applies power to one coil (power transmission side) to generate a magnetic field, and the other coil (power reception side) receives the magnetic field to generate power. This is a method of transmitting power at the contacts.

  Further, the power supply unit and the power holding unit 13 may be used together. In this case, since the amount of power held by the power holding unit 13 can be reduced, the power holding unit 13 can be downsized by using a small storage battery or the like.

  FIG. 17 is a flowchart illustrating a process of the system control unit 10 according to the present embodiment.

  First, when the user operates the switch 9, the power of the image projection apparatus 1 is turned on (step S171). The power supply circuit 8 starts supplying power to each unit of the image projection device 1.

  Next, the system control unit 10 initializes the image projection device 1 (Step S172). The movable unit 55 moves the DMD 551 to the initial position.

  Next, the DMD 551 forms a projection image based on the input image data under the control of the image control unit 11. The projection optical system unit 60 projects the formed image on the screen S (Step S173).

  If necessary, the movable unit 55 moves or rotates the DMD 551 to adjust the position or the inclination of the DMD 551 (Step S174). The movement or rotation of the DMD 551 by the movable unit 55 is performed by, for example, operating the main body operation unit 5 while the user visually recognizes the projection image.

  The system control unit 10 determines whether a power-off signal has been input during the operation of the image projection device 1. More specifically, the system control unit 10 determines whether the power button provided on the main body operation unit 5 has been pressed down, or whether the remote control light receiving unit 7 has received a power OFF signal from the remote control 71 (step S176). .

  When the system control unit 10 determines that the power supply OFF signal has been input (step S176, Yes), the system control unit 10 shifts the image projection apparatus 1 to the stop mode (step S180).

  After that, the system control unit 10 turns off the power of the image projection apparatus 1 (Step S181).

  On the other hand, when the system control unit 10 determines that the power supply OFF signal is not input (No at Step S176), the detection unit 81 detects the voltage input to the power supply circuit 8 (Step S177).

  When the input voltage or the like of the power supply circuit 8 is larger than the threshold (Yes at Step S178), the process returns to Step S176.

  On the other hand, when the input voltage or the like of the power supply circuit 8 is equal to or lower than the threshold (No at Step S178), the detection unit 81 outputs a notification signal to the system control unit 10. The movable unit 55 moves the DMD 551 to an initial position at a predetermined speed under the control of the movement control unit 12 (Step S179).

  Along with the processing of step S179, the system control unit 10 causes the image projection device 1 to shift to the stop mode (step S180).

  After that, the system control unit 10 turns off the power of the image projection apparatus 1 (Step S181).

  In this way, even when the supply of power to the image projection apparatus 1 is suddenly stopped, the image projection apparatus 1 prevents the movable unit 55 from colliding with the fixed unit 51 and generating a loud collision sound. be able to.

  As described above, in the present embodiment, when the supply of power to the image projection apparatus 1 is suddenly stopped due to a power failure or the like, the movable unit 55 moves at a speed lower than the speed at which the movable unit 55 freely falls under its own weight. Moving. As a result, even when the movable unit 55 hits the fixed unit 51, no loud collision sound is generated. Therefore, a loud collision sound when the movable unit 55 falls and collides with the fixed unit 51 can be reduced. By reducing the loud collision sound, it is possible to provide an image projection device that does not cause discomfort to the user.

  In the above description, an example of an image projection apparatus using a DMD as an image forming element has been described, but the present embodiment is also applicable to an image projection apparatus using another image forming element such as a liquid crystal panel.

[Second embodiment]
In the present embodiment, an imaging device will be described as an example of an optical device.

  FIG. 18 is a diagram illustrating an example of a configuration of an imaging device 90 according to the present embodiment. As illustrated in FIG. 18, the imaging device 90 includes an optical unit 91, an imaging device 92, and a housing 93. Inside the housing 93, the optical unit 91 is installed so as to be movable in the optical axis direction indicated by the arrow in FIG. 18, and the image sensor 92 is fixed.

  The optical unit 91 has an imaging lens 911 and a voice coil motor (VCM) 912, and the imaging lens 911 includes a lens 911a and a lens 911b. In the following, the voice coil motor is abbreviated as “VCM” for simplicity. The imaging lens 911 is an example of an “optical element”, and is an example of a “lens”.

  The optical unit 91 forms a subject image on the imaging surface of the imaging element 92. The optical unit 91 can perform focus adjustment using the VCM 912. Note that the optical unit 91 is an example of a “drive unit”.

  The VCM 912 includes a coil and a magnet, and when a current is applied to the coil, a Lorentz force is generated by a magnetic field formed by the magnet. The VCM 912 can adjust the focus of the image by the optical unit 91 by moving the optical unit 91 in the optical axis direction with such Lorentz force.

  The imaging element 92 captures an image formed by the optical unit 91. As the imaging element 92, for example, a metal oxide semiconductor device (MOS), a complementary metal oxide semiconductor device (CMOS), a charge coupled device (CCD), or the like can be used.

  FIG. 19 is a block diagram illustrating a functional configuration of the imaging device according to the present embodiment. The imaging device 90 includes a power storage unit 94, a switch 95, a system control unit 96, an operation unit 97, and a display unit 98.

  The power storage unit 94 is a storage battery such as a lithium ion battery, and supplies power to each unit of the imaging device 90. The power storage unit 94 includes a detection unit 941. Detecting section 941 detects an output voltage of power storage section 94, and outputs a signal (notification signal) notifying the system control section 96 when the output voltage is equal to or lower than the threshold value. The power storage unit 94 is an example of a “power circuit”.

  The system control unit 96 shifts the imaging device to the stop mode according to the notification signal. The detection unit 941 is realized by, for example, an electric circuit or the like provided in the power storage unit 94. Note that the detection unit 941 may detect the output current of the power storage unit 94 and output a notification signal to the system control unit 96 when the output current is equal to or less than the threshold. In view of this, the output voltage or output current detected by the detection unit 81 may be hereinafter referred to as “output voltage or the like”.

  The switch 95 is used for an ON / OFF operation of the imaging device 90 by the user. When the switch 9 is turned on, the power storage unit 94 starts supplying power to each unit of the imaging device 90. On the other hand, when the switch 9 is turned off, the power storage unit 94 stops supplying power to each unit of the imaging device 90.

  The system control unit 96 has a VCM control unit 961 and an imaging control unit 962. The system control unit 96 includes, for example, a CPU, a ROM, a RAM, and the like, and the functions of each unit are realized by the CPU executing a program stored in the ROM in cooperation with the RAM.

  The VCM control unit 961 controls the position of the optical unit 91 so as to move the optical unit 91 movably provided inside the housing 93 and adjust the focus of an image by the optical unit 91.

  The imaging control unit 962 sets or controls the shutter speed, shutter timing, and the like of imaging by the imaging element 92. Further, the imaging control unit 962 inputs an image captured by the imaging element 92 and outputs the image to the display unit 98.

  The operation unit 97 receives user operations such as turning on / off the power or adjusting the size, position, and color tone of a captured image. The operation unit 97 receives a focus adjustment operation by the user and outputs a control signal corresponding to the operation to the VCM control unit 961. The VCM control unit 961 controls the position of the optical unit 91 so as to move the optical unit 91 and adjust the focus of the image by the optical unit 91 based on the input control signal.

  The display unit 98 inputs and displays an image captured by the image sensor 92 via the imaging control unit 962. Further, an operation screen or the like for instructing an operation may be displayed. The display section 98 can be composed of, for example, a liquid crystal panel or the like.

  The power holding unit 13a holds a predetermined amount of power. When the output voltage or the like of the power storage unit 94 detected by the detection unit 941 is equal to or lower than the threshold, the power holding unit 13a supplies power to the system control unit 96 and the like, and enables the VCM control unit 961 to move the optical unit 91. I do. The power holding unit 13a is realized by a storage battery such as a lithium ion battery. However, the present invention is not limited to this, and a capacitor or the like may be used.

  The power holding unit 13a is charged by the power supplied from the power storage unit 94 when the imaging device 90 is operating and the output voltage or the like of the power storage unit 94 is not equal to or lower than the threshold.

  Here, control when the output voltage or the like of power storage unit 94 is equal to or lower than a threshold will be described. For example, when the supply of power to the imaging device 90 is suddenly stopped due to a lack of charge of the power storage unit 94, the Lorentz force does not work on the optical unit 91, and the optical unit 91 stops in the vertical direction due to its own weight. become unable. The optical unit 91 may drop by its own weight and collide with a member such as the housing 93 to generate a loud collision sound or damage the member such as the housing 93 or the optical unit 91.

  In the present embodiment, the detection unit 941 detects the output voltage or the like of the power storage unit 94, and outputs a signal (notification signal) notifying the system control unit 96 when the output voltage or the like is equal to or lower than the threshold value. As such a threshold, a lower limit of an output voltage or the like for generating a Lorentz force that allows the optical unit 91 to stand still in the vertical direction is obtained in advance and stored in a ROM or the like. The detection unit 941 acquires a threshold value by referring to a ROM or the like.

  The system control unit 96 shifts the imaging device 90 to the stop mode according to the notification signal, and the VCM control unit 961 moves the optical unit 91 to the initial position at a predetermined speed.

  The predetermined speed is, for example, a speed lower than the speed at which the optical unit 91 freely falls under its own weight. Such a speed is obtained in advance based on the weight of the optical unit 91 and the like, and is stored as a predetermined speed in a ROM or the like. The weight of the optical unit 91 may include the weight of the imaging lens 911, the VCM 912, and the like included in the optical unit 91.

  When the output voltage or the like of the power storage unit 94 is equal to or less than the threshold, the VCM control unit 961 acquires a predetermined speed by referring to a ROM or the like, and moves the optical unit 91 at a predetermined speed. The initial position is, for example, an initial position where the optical unit 91 is arranged when the imaging device 90 is activated. The “start-up” is, for example, when the user operates the switch 95 and the power storage unit 94 starts supplying power to each unit of the imaging device 90.

  In the present embodiment, when the power supply of the imaging device 90 is suddenly stopped due to, for example, running out of charge of the power storage unit 94, the optical unit 91 can move at a speed lower than the speed at which the optical unit 91 freely falls under its own weight. . Accordingly, even when the optical unit 91 comes into contact with a member such as the housing 93, no loud collision sound is generated, and the member such as the housing 93 or the optical unit 91 is not damaged.

  The amount of power held by the power holding unit 13a only needs to be at least the amount of power necessary to move the optical unit 91 to the initial position at a speed lower than the speed at which the optical unit 91 freely falls under its own weight. Such an amount of power is obtained in advance based on the weight of the optical unit 91 and the like, and a storage battery, a capacitor, or the like that can hold a necessary amount of power is selected and used.

  In the stop mode, it is sufficient that at least a driving force for moving the optical unit 91 to the initial position can be generated. Therefore, the imaging device 90 may include a power supply unit instead of the power holding unit 13a. The power supply unit supplies power to the system control unit 96 and the like by wireless power supply, for example.

  Further, the power supply unit and the power holding unit 13a may be used together. In this case, since the amount of power held by the power holding unit 13a can be reduced, the power holding unit 13a can be downsized by using a small storage battery or the like.

  As described above, in the present embodiment, when the power supply of the imaging device 90 is suddenly stopped due to, for example, running out of charge of the power storage unit 94, the optical unit 91 is slower than, for example, the speed at which it falls free under its own weight. Move at speed. Accordingly, it is possible to prevent the optical unit 91 from colliding with a member such as the housing 93 to generate a loud collision sound or to damage the member such as the housing 93 or the optical unit 91.

  The other effects are the same as those described in the first embodiment.

  As described above, the image projection apparatus and the image forming method according to the embodiment have been described, but the present invention is not limited to the above embodiment, and various modifications and improvements can be made within the scope of the present invention.

Reference Signs List 1 image projection device 5 main body operation unit 8 power supply circuit 81, 941 detection unit 10, 96 system control unit 11 image control unit 12 movement control unit 13, 13a power holding unit 14 notification unit 30 light source 40 illumination optical system unit 50 image display unit 51 Fixed unit 55 Movable unit (an example of a drive unit)
60 Projection optical system unit 511 Top plate 512 Base plate 515 Support column 521 Support sphere 522, 526 Support hole 524 Position adjustment screw 531, 532, 533, 534 Magnet 581, 582, 583, 584 Coil 551 DMD (an example of an optical element, image forming Example of element)
552 movable plate 553 coupling plate 554 heat sink 560 stepped screw 561 spring 571 movable range limiting hole 90 imaging device 91 optical unit (an example of a driving unit)
911 Imaging lens (an example of an optical element, an example of a lens)
912 Voice coil motor (VCM)
92 Image sensor 93 Housing 94 Power storage unit 961 VCM control unit

Japanese Patent No. 3571928

Claims (8)

A drive unit that is supplied with power and moves the optical element by electromagnetic force,
A power supply circuit for supplying power to the driving unit;
A detection unit that detects a voltage or a current of the power supply circuit,
An optical device, comprising: a power holding unit that holds a predetermined amount of power and supplies power to the driving unit when the voltage or the current is equal to or less than a predetermined threshold. The driving unit moves the optical element in a direction including a vertical direction,
When the voltage or the current is equal to or less than the predetermined threshold, the driving unit is supplied with power from the power holding unit, and controls the optical element at a speed lower than a speed at which the driving unit falls freely. The optical device according to claim 1, wherein the optical device is moved to a position. The optical device according to claim 1, wherein the predetermined position is an initial position where the optical element is arranged when the optical device is activated. 4. The optical device according to claim 1, wherein the predetermined power amount is a power amount by which the driving unit moves the optical element. 5. 5. The information processing apparatus according to claim 1, further comprising a notification unit configured to notify a user that the voltage or the current is equal to or less than the predetermined threshold when the voltage or the current is equal to or less than the predetermined threshold. The optical device according to claim 1. A drive unit that is supplied with power and moves the optical element by electromagnetic force,
A power supply circuit for supplying power to the driving unit;
A detection unit that detects a voltage or a current of the power supply circuit,
A power holding unit that holds a predetermined amount of power, and the optical element used in an optical device having:
When the voltage or the current is equal to or less than a predetermined threshold, the optical element is moved by the driving unit to which power is supplied from the power holding unit. An image projection device that has an image forming element for forming an image and projects the image,
A driving unit that is supplied with power and moves the image forming element by electromagnetic force,
A power supply circuit for supplying power to the driving unit;
A detection unit that detects a voltage or a current of the power supply circuit,
An image projection apparatus, comprising: a power holding unit that holds a predetermined amount of power and supplies power to the driving unit when the voltage or the current is equal to or less than a predetermined threshold. An imaging device that has a lens that forms an image of a subject and captures the image,
A driving unit that is supplied with electric power and moves the lens by electromagnetic force,
A power supply circuit for supplying power to the driving unit;
A detection unit that detects a voltage or a current of the power supply circuit,
An imaging apparatus comprising: a power holding unit that holds a predetermined amount of power and supplies power to the driving unit when the voltage or the current is equal to or less than a predetermined threshold.

Images