JP4898243B2 - LIGHTING DEVICE AND PROJECTION VIDEO DISPLAY DEVICE USING THE SAME - Google Patents

Description

  The present invention relates to an illumination device that emits an illumination light beam from a light source through a light guide, and a projection video display device using the illumination device.

  For example, as a projection-type image display device that projects and displays an image on a screen, the illumination light flux from the illumination device is spatially modulated according to the image signal by a spatial light modulation element such as a liquid crystal panel or DMD (digital micromirror device) Various projectors have been proposed that project onto a screen through a projection lens.

  As an illumination device used in such a projector, for example, three types of LED light sources R, G, and B are used, and light emitted from each light source is guided to a spatial light modulator through a light guide such as a rod lens. What was made is known (for example, refer patent document 1).

  By using such an illuminating device, it is possible to configure a single-plate projector having a small size and high light utilization efficiency by time-division driving the spatial light modulation element in accordance with the lighting timing of each light source.

JP 2004-341424 A

  By the way, as disclosed in Patent Document 1, when a light guide such as a rod lens is used, illumination light from a light source needs to be converged and incident on an incident surface of the light guide. It is necessary to expand the illumination light beam emitted from the exit surface of the body and irradiate the spatial light modulator.

  For this reason, if dust adheres to the entrance surface or the exit surface of the light guide, the illumination light flux emitted from the light source is blocked by the dust, reducing the light utilization efficiency, and entering the spatial light modulator by the attached dust. There is a concern that unevenness in the illuminance distribution of the illuminating light beam will cause a reduction in the image quality of the image projected on the screen.

  Accordingly, an object of the present invention made in view of such circumstances is to provide an illuminating device capable of improving light utilization efficiency and obtaining an illuminating light flux having a uniform illuminance distribution, and a projection video display device using the same. is there.

The invention according to claim 1, which achieves the above object, is an illumination device in which an illumination light beam from a light source is emitted through a light guide.
A holder for holding the light guide;
An elastic support member that supports the holder so as to be displaceable at least in the optical axis direction with respect to the holder support member;
Holder driving means for driving the holder;
Position detecting means for detecting the position of the holder in the optical axis direction;
Servo control means for controlling the position of the holder in the optical axis direction by the holder driving means based on the output of the position detecting means;
Vibration control means for selectively vibrating the holder by the holder driving means under a non-operating state of the servo control means ,
The holder driving means comprises an electromagnetic driving means having a permanent magnet and a coil, the permanent magnet on the holder side, and the coil on the holder support member side,
The holder supporting member is made of a magnetic material, and the coil is coupled to the holder supporting member through a coil printed board in a state where the holder supporting member enters the coil .

  According to a second aspect of the present invention, in the illumination device according to the first aspect, the position detecting means includes a hologram element provided on a surface orthogonal to the optical axis of the light guide, and predetermined diffracted light of the hologram element. And a photodetector arranged so as to receive light.

  According to a third aspect of the present invention, in the illumination device according to the second aspect, the hologram element is provided on an incident surface or an output surface of the light guide.

  According to a fourth aspect of the present invention, in the illuminating device according to any one of the first to third aspects, the holder support member is attached to the base member via a holder tilt adjustment mechanism so that the tilt in the optical axis direction can be adjusted. It is characterized by holding.

  The invention according to claim 5 is the illumination device according to claim 4, wherein the light source is attached to a light source printed board via a metal light source support member, and the light source printed board is inclined in the optical axis direction. Is connected to the base member via a light source tilt adjusting mechanism.

  According to a sixth aspect of the present invention, in the illumination device according to any one of the first to fifth aspects, the light source comprises a point light source array having a plurality of point light sources, the point light source array, the light guide, A lens array having a plurality of single lenses is arranged between the two.

  According to a seventh aspect of the present invention, in the illumination device according to the sixth aspect, the lens array is formed by integrally molding the plurality of single lenses with an optical material having a higher refractive index than the array substrate together with the array substrate. It is characterized by.

  According to an eighth aspect of the present invention, in the illumination device according to any one of the first to seventh aspects, the excitation control means has an oscillation circuit, and the holder driving means is controlled based on the output of the oscillation circuit. It is configured to drive and vibrate the holder at the resonance frequency of the movable part including the holder.

According to a ninth aspect of the present invention, in the illumination device according to any one of the first to eighth aspects, the permanent magnet is divided into two in the optical axis direction and the magnetic pole surface in the thickness direction is disposed with a reverse polarity. ,
On the side where the coil is arranged, a Hall element is provided so as to face the dividing boundary line of the permanent magnet,
The holder is configured to detect the vibrating operation of the holder by the holder driving means based on the output of the Hall element.

The invention according to claim 10 is the illumination device according to any one of claims 1 to 8 , wherein a photo reflector is provided on the holder support member side or the holder side,
Provided on the holder side or the holder support member side is a reflecting member that is inclined in the optical axis direction and reflects light from the photoreflector,
The present invention is characterized in that the vibration excitation operation of the holder by the holder driving means is detected based on the output of the photo reflector.

Furthermore, the invention of the projection type video display device according to claim 11 for achieving the above object is as follows:
The lighting device according to any one of claims 1 to 10 ,
A spatial light modulation element that spatially modulates an illumination light beam from the illumination device according to an image;
And a projection lens for projecting and displaying the illumination light beam spatially modulated by the spatial light modulation element.

  According to the present invention, the holder for holding the light guide is supported so as to be displaceable at least in the optical axis direction and can be vibrated by the holder driving means. Dust can be positively removed. Therefore, it is possible to improve the light use efficiency of the illumination light beam emitted from the light source and to obtain an illumination light beam having a uniform illuminance distribution.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

(First embodiment)
FIG. 1 is a diagram schematically showing a schematic configuration of an optical system of a projector using the illumination device according to the first embodiment of the present invention.

  The projector 1 includes a lighting device 2, a single-plate spatial light modulation element 3 such as a liquid crystal panel or DMD, and a projection lens 4. G and B illumination light beams are sequentially irradiated, and the spatial light modulation element 3 is driven in a time-sharing manner in synchronization with the irradiation timing to spatially modulate the illumination light beam according to the video signal, thereby passing through the projection lens 4 and the screen 5. Color images are displayed on the screen.

  The illumination device 2 includes an LED array 11 that is a light source, a lens array 12, a light guide 13 that is a rod lens having a rectangular cross section, a hologram element 14, a first lens 15, a second lens 16, and a photodetector that is position detection means. 17 and 18.

  The LED array 11 includes a G LED group 11G that emits G light arranged in a matrix, a B LED group 11B that emits B light, and an R LED group 11R that emits R light. The G LED group 11G, the B LED group 11B, and the R LED group 11R are sequentially controlled to be lighted at a predetermined timing.

  The lens array 12 has a single lens 12a arranged in a matrix corresponding to each LED of the LED array 11, and guides the G light emitted from the G LED group 11G through the corresponding single lens group. The light beam 13 converges and enters, and the B light emitted from the B LED group 11B converges and enters the light guide 13 through the corresponding single lens group, and is similarly emitted from the R LED group 11R. The R light is arranged so as to converge and enter the light guide 13 through the corresponding single lens group.

  The light guide 13 includes, for example, a B incident surface 13IB orthogonal to the optical axis, a G incident surface 13IG and an R incident surface 13IR inclined in opposite directions with respect to the optical axis, and the optical axis. The G light from the lens array 12 is refracted from the G incident surface 13IG and guided along the optical axis, and the B light is incident on the B incident surface 13IB. And is guided along the optical axis, and R light is refracted and incident along the optical axis from the R incident surface 13IR, and is emitted from the common exit surface 13O. The illumination light beam emitted from the first lens 15 is magnified by the first lens 15 and then converted into a parallel light beam by the second lens 16 to illuminate the spatial light modulator 3.

  The light guide 13 can be configured by a single rod lens, or can be configured by bundling a plurality of rod lenses. When the light guide 13 is composed of a plurality of rod lenses, for example, in FIG. 1, a rod lens having a B entrance surface 13IB, a rod lens having a G entrance surface 13IG, and an R entrance. A total of three rod lenses, including a rod lens having a surface 13IR, are formed by forming a cross section in a regular octagon or regular hexagon and bonding them with an ultraviolet curable adhesive.

  The hologram element 14 is provided so as to be joined to the emission surface 13O of the light guide 13. The hologram element 14 diffracts each of R, G, and B light emitted from the emission surface 13O, the 0th-order light enters the second lens 16 through the first lens 15, and the ± 1st-order diffracted light is the first light. The light enters the photodetectors 17 and 18 through the lens 15.

  For this reason, in the present embodiment, a hologram region is formed on the hologram element 14 so as to diffract each light in the same direction corresponding to each emission region of R, G, B light from the emission surface 13O. ing. Further, for example, the 0th-order light in the hologram element 14 is 80%, for example, ± 1st-order diffracted light is 20%, and the light source 13 is displaced in the optical axis direction based on the outputs of the photodetectors 17 and 18. For detection, astigmatism with different lens power is given to ± first-order diffracted light.

  As shown in FIG. 2, each of the photodetectors 17 and 18 includes light receiving areas 17a to 17d and 18a to 18d which are divided into four parts. The outputs of the light receiving areas 17a to 17d are a to d and the light receiving area 18a. When the output of .about.18d is a 'to d', the positional deviation .DELTA.F of the light guide 13 in the optical axis direction is calculated by the astigmatism method. .DELTA.F = {(a + d)-(b + c)}-{(b '+ c ')-(A' + d ')} is calculated and detected.

  In the present embodiment, the light guide 13 is configured to be vibrated as will be described later, and dust attached to the light guide 13 and the hologram element 14 is removed.

  Note that a cooling and exhaust fan 7 is provided in the housing of the projector 1, and the rotation of the fan 7 introduces outside air into the projector 1 from an outside air introduction unit (not shown), thereby cooling the lighting device 2. At the same time, the dust particles removed by the vibration of the light guide 13 are discharged to the outside.

  FIG. 3 is a cross-sectional view illustrating a configuration of a main part of the illumination device 2 illustrated in FIG. 1. The illumination device 2 according to the present embodiment includes a base member 21, a lens array holding member 22, a light source holding plate 23, and a holder support member 24.

  The lens array holding member 22 is fixed to the base member 21 via a heat insulating material 25. The lens array holding member 22 is formed of a material having a low thermal expansion coefficient (for example, an iron alloy), the lens array 12 is loaded on the inner side, and the temperature sensor 26 is attached on the outer side.

  In the present embodiment, the lens array 12 is made of a low refractive index transparent glass (for example, BK7) as an array substrate 12b, and together with the array substrate 12b, has a higher refractive index (for example, a refractive index of about 2.0). The lens array 12 is formed by integrally molding a plurality of single lenses 12a with the optical material (1), thereby simplifying assembly and machining. The lens array 12 can be formed by forming an array substrate in a flat plate shape using a metal such as iron or stainless alloy, and a single lens group fixed to the array substrate with an ultraviolet curable adhesive. In some cases, high precision is required for processing the array substrate and assembling the single lens group.

  The G LED group 11G, the B LED group 11B, and the R LED group 11R are attached to a light source printed circuit board 32 via a metal light source support member 31 such as a stainless alloy or an aluminum alloy. The printed circuit board 32 is fixed to the light source holding plate 23 via small screws or the like (not shown).

  Like the light source support member 31, the light source holding plate 23 is made of a metal material such as a stainless alloy or an aluminum alloy, and cooling heat radiation fins 23a are formed at appropriate locations. The light source holding plate 23 is fixed to the lens array holding member 22 via a light source tilt adjusting mechanism 35 so that the tilt can be adjusted. The light source tilt adjusting mechanism 35 includes, for example, a plurality of (for example, three) adjusting screws 36 for fixing the light source holding plate 23 to the lens array holding member 22, and the light source holding plate 23 and the lens array holding member 22. And an elastic body 37 such as a compression coil spring or a disc spring arranged with the adjusting screws 36 penetrating therebetween.

  The holder support member 24 is made of a magnetic material, and the light guide 13 is supported by the holder support member 24. In the present embodiment, the light guide 13 is held by the holder 41, and the holder 41 is supported by the holder support member 24 so as to be displaceable in a direction including at least the optical axis direction of the light guide 13.

  For this reason, as shown in the front view seen from the optical axis direction in FIG. 4, the holder 41 has two leaf springs 42 a, which are elastic support members, in the center part (near the center of gravity) of both opposing side surfaces. Each end of each of the leaf springs 42a and 42b passes through the bent portions 24a and 24b and the spacers 43a and 43b formed in the holder support member 24 and is coiled. Soldered to the printed circuit board 44a.

  The leaf springs 42a and 42b are capable of smoothly displacing the holder 41 in the optical axis direction, and the holder 41 can be rotated around a straight line connecting the attachment portions of the leaf springs 42a and 42b to the holder 41. As shown in detail in FIG. 5, the widthwise central portion is opened over the length direction, and the attachment end on the holder 41 side is constricted in a U-shape, and silicon gel or the like is formed in the constricted portion. The damper material 45 is held. Further, auxiliary cylinders 46a and 46b through which the leaf springs 42a and 42b pass are attached to the bent portions 24a and 24b, and a damper material 45 such as silicon gel is filled in the auxiliary cylinders 46a and 46b. ing.

  The coil printed board 44a has two air-core coils that are positioned between the bent portions 24a and 24b on the surface on the holder 41 side, extend in the optical axis direction, and are divided into two in the optical axis direction. 51a and 51b are mounted. The coils 51 a and 51 b are bonded by their cores entering a bent portion 24 c formed on the holder support member 24. Thus, the coil printed board 44a and the coils 51a and 51b are fixed to the holder support member 24.

  On the other hand, permanent magnets 52 a and 52 b magnetized in the thickness direction are attached to the side surfaces of the holder 41 facing the coils 51 a and 51 b with the polarity reversed, and the coils 51 a and 51 b are connected to each other via the flexible wiring board 53. By supplying a current in the reverse direction, a driving force in the optical axis direction is applied to the holder 41 by an electromagnetic action with the permanent magnets 52a and 52b.

  Further, as shown in FIG. 3, a hall element 54 is attached to the coil printed board 44a so as to face the boundary between the permanent magnets 52a and 52b in order to detect the vibration operation of the holder 41.

  The holder support member 24 is further formed with a bent portion 24d on the opposite side of the bent portion 24c across the holder 41. The bent portion 24d has an air-core coil loaded on the coil printed board 44b. 55 is inserted and fixed so as to extend in the optical axis direction. A permanent magnet 56 magnetized in the thickness direction is attached to the side surface of the holder 41 facing the coil 55, and an electric current is passed through the coil 55 via the flexible wiring board 53, thereby Due to the action, a driving force in the optical axis direction is applied to the holder 41, and the holder 41 is held by the holder support member 24 by the coil 55, the permanent magnet 56, the coils 51a, 51b and the permanent magnets 52a, 52b. In contrast, a moving magnet type electromagnetic driving means for displacing in a direction including the optical axis direction is configured.

  The holder support member 24 is an elastic member such as a compression coil spring or a disc spring disposed via the holder tilt adjusting mechanism 57 having the same configuration as the light source tilt adjusting mechanism 35, that is, between the holder support member 24 and the base member 21. The inclination of the optical axis direction is attached to the base member 21 by a plurality of adjustment screws 59 via 58.

  Next, the schematic configuration of the main part of the control circuit in projector 1 according to the present embodiment will be described with reference to the block diagram shown in FIG.

  The control circuit includes a mode selection switch 101, a CPU 102, an oscillation circuit (OSC) 103, a dust removal resonance driving circuit 104, a discrimination circuit 105, a servo circuit 106, a fan driving circuit 110, a light source driving circuit 111, a display circuit 112, and a storage unit. (ROM) 113 is included. Note that the illustration of the drive circuit for the spatial light modulator 3, the processing circuit for the video signal supplied to the spatial light modulator 3, and the like is omitted. Here, the CPU 102 and the servo circuit 106 constitute servo control means, and the CPU 102, the oscillation circuit (OSC) 103, and the dust removal resonance driving circuit 104 constitute excitation control means.

  The mode selection switch 101 is an operation mode of the projector 1 by an infrared remote control or manual operation, in this embodiment, a dust removal mode in which the holder 41 holding the light guide 13 is vibrated, or an image display for projecting and displaying an image. The CPU 102 detects the selected operation mode.

  The OSC 103 is driven in the dust removal mode under the control of the CPU 102, thereby supplying power to the coils 51a, 51b, 55 via the dust removal resonance driving circuit 104, and attaching the holder 41 to the leaf springs 42a, 42b. Centering on a straight line connecting the parts, the vibration is driven in the forward and reverse directions at the resonance frequency of the movable part including the holder 41 for excitation.

  The determination circuit 105 is constituted by, for example, a window comparator, and determines the quality of the vibration operation based on the output of the Hall element 54 provided on the holder support member 24, and the determination result is supplied to the CPU 102.

  The servo circuit 106 includes a gain circuit, a phase compensation circuit, and the like. In the video display mode, the CPU 102 calculates the above-described positional deviation ΔF based on the outputs of the photodetectors 17 and 18, and the ΔF is zero. Thus, under the control of the CPU 102, power is supplied to the coils 51a, 51b and 55 to drive the holder 41 in a direction parallel to the optical axis, thereby positioning the light guide 13 at a predetermined position in the optical axis direction. Position control is performed.

  The fan drive circuit 110 drives the cooling / exhaust fan 7 and is controlled by the CPU 102 based on the operation mode and the output of the temperature sensor 26.

  The light source drive circuit 111 is configured to drive the LED array 11 under the control of the CPU 102.

  The display circuit 112 is controlled by the CPU 102, and includes a display element that displays a message and the like, and a plurality of LEDs that display an excitation operation state of the holder 41, an operation state of the fan 7, and the like.

  The storage unit 113 stores gain and offset data, which are temperature parameters used when controlling the position of the holder 41, drive voltage data, which is a temperature parameter used when controlling the light emission amount of the LED array 11, and the like. It is read by the CPU 102 corresponding to the output of the temperature sensor 26 and used for position control of the holder 41 and light emission amount control of the LED array 11.

  The CPU 102 controls the operation of each part according to a predetermined program based on the state of the mode selection switch 101, the outputs of the photodetectors 17 and 18, the output of the Hall element 54, and the output of the temperature sensor 26. In the dust removal mode, a plurality of timers for driving the set time of the holder 41 and the drive time of the fan 7 for various set times according to the program are incorporated.

  Hereinafter, the operation of the main part when the video display mode is selected by the mode selection switch 101 will be described with reference to the flowchart shown in FIG.

  When the CPU 102 detects that the video display mode is turned on by the mode selection switch 101 (step S1), first, the output of the temperature sensor 26 is taken to detect the temperature (step S2), and this corresponds to the detected temperature. Temperature parameters in the light emission amount control and the position control are read from the storage unit 113 (step S3).

  After that, the LED array 11 is driven to turn on via the light source drive circuit 111 based on the read temperature parameter in the light emission amount control (step S4), and then the position shift calculated based on the outputs of the photodetectors 17 and 18 is performed. Based on ΔF and the read temperature parameter in the position control, the servo circuit 106 feeds power to the coils 51a, 51b, 55 to perform position control for translating the holder 41 in the optical axis direction (step S5). The LED array 11 is driven so as to sequentially turn on the R LED group 11R, the G LED group 11G, and the B LED group 11B according to the field sequential rate in the spatial light modulation element 3.

  When the holder 41 is positioned at a predetermined position in the optical axis direction by the position control in step S5 and ΔF = 0 (step S6), a message such as “Projector ready” is displayed on the display circuit 112 (step S7). ).

  Thereafter, a desired video display is performed (step S8). When the CPU 102 detects that the video display mode is turned off by the mode selection switch 101 (step S9), the driving of the LED array 11 is stopped and the servo circuit is stopped. The driving of 106 is stopped and the processing of the video display mode is ended.

  During the video display in step S8, the CPU 102 monitors the output of the temperature sensor 26, controls the LED array 11 to a predetermined light emission amount in real time according to the detected temperature, and sets the position of the holder 41 in the optical axis direction. The light guide 13 is maintained at a predetermined position by controlling in real time. When the detected temperature exceeds the set temperature, the CPU 102 drives the fan 3 via the fan drive circuit 110 to maintain the projector 1 at the set temperature or lower.

  Next, the operation of the main part when the dust removal mode is selected by the mode selection switch 101 will be described with reference to the flowchart shown in FIG.

  When the CPU 102 detects that the dust removal mode is turned on by the mode selection switch 101 (step S31), first, the LED array 11 is not lit and driven, the holder 41 is vibrated (step S32) and the fan 7 is turned on. Driving (step S33) is started in parallel.

  That is, in step S32, by driving the OSC 103 and supplying the required alternating current to the coils 51a, 51b, and 55 via the dust removal resonance driving circuit 104 based on the output, the holder 41 is vibrated. In step S33, the dust adhering to the incident surface of the light guide 13, that is, the R incident surface 13IR, the G incident surface 13IG, and the B incident surface 13IB, and the dust adhered to the exit surface of the hologram element 14 are removed. The fan 7 is driven via the fan driving circuit 110 and the removed dust is discharged outside the projector 1.

  Here, in the excitation operation of the holder 41 in step S32, the direction of the driving force by the coils 51a and 51b and the direction of the driving force by the coil 55 are opposite directions, and the holder 41 is supported by the leaf springs 42a and 42b. Centering on a straight line connecting the points, a rotational vibration is made in the forward and reverse directions at the resonance frequency of the movable part including the holder 41.

  When the excitation operation of the holder 41 is started, for example, the green LED for excitation operation display in the display circuit 112 is turned on (step S34), the built-in timer of the CPU 102 is reset (step S35), and the first set time ( For example, it is monitored whether or not 15 seconds have elapsed (step S36). During this first set time, the CPU 102 monitors the determination result in the determination circuit 105 based on the output of the Hall element 54 to determine whether the holder 41 is normally vibrated, that is, the coils 51a, 51b, 55. (Step S37), if there is an abnormality, the current supply from the dust removing resonance driving circuit 104 to the coils 51a, 51b, 55 is interrupted, The vibrating operation of the holder 41 is stopped (step S38), and the green LED in the display circuit 112 is blinked (step S39).

  On the other hand, when the holder 41 is normally vibrated and the first set time elapses, the vibration is continued until the second set time (for example, 15 seconds from the elapse of the first set time elapses) ( In step S40, when the time has elapsed, the vibration operation is terminated (step S41), and the green LED is turned off (step S42).

  On the other hand, in driving the fan 7 in step S33, for example, a yellow LED for fan operation display in the display circuit 112 is turned on by the start of driving (step S43), and the display element of the display circuit 112 is, for example, “dust removal”. “Operation in progress” message is displayed (step S44), the built-in timer of the CPU 102 is reset (step S45), and a third set time (for example, an arbitrary time of 30 to 60 seconds) has elapsed. Is monitored (step S46).

  During this third set time, the CPU 102 determines whether or not the determination result in step S37 is normal, that is, whether or not the vibration operation of the holder 41 is normal (step S47). Displays a message to that effect, for example, “vibration abnormality” on the display element of the display circuit 112 (step S48), and ends all operations.

  On the other hand, when the vibration operation is normal and the third set time has elapsed, the yellow LED is turned off (step S49), and a message such as “Dust removal completed” is displayed on the display element (step S50). ), The process in the dust removal mode is terminated.

  As described above, according to the present embodiment, the light guide 13 is held by the holder 41, and the holder 41 is supported by the holder support member 24 so as to be displaceable via the leaf springs 42a and 42b. Therefore, it is possible to remove dust by vibrating the light guide 13 with a simple configuration.

  In addition, the positional deviation ΔF of the holder 41 in the optical axis direction is detected based on the outputs of the photodetectors 17 and 18 that receive the diffracted light of the hologram element 14, and servo-controlled so that the positional deviation ΔF becomes zero. Since the holder 41 is automatically positioned at a predetermined position in the optical axis direction, the assembly of the lighting device 2 can be facilitated, and an image is always projected and displayed in an optimum state without being affected by external vibration. be able to.

  In addition, a Hall element 54 for detecting the position of the holder 41 is provided, and the output is monitored by the CPU 102 through the determination circuit 105 during the vibration operation to confirm whether the vibration operation has been performed normally. Therefore, the reliability of the apparatus can be improved.

(Second Embodiment)
FIG. 9 is a diagram illustrating a configuration of a main part of the illumination device according to the second embodiment of the present invention, and corresponds to FIG. 4 of the first embodiment.

  In this embodiment, as an elastic support member that supports the holder 41 so as to be displaceable, a total of four L-shaped leaf springs, two on each side, and springs 80a to 80d (wires having a circular or rectangular cross section) The holder 41 is supported in the vicinity of the center of gravity using 80c and 80d (not shown). The springs 80a; 80b, 80c; 80d pass through the bent portions 24a, 24b and the spacers 43a; 43b, 43c, 43d (43c, 43d are not shown) and are soldered to the coil printed board 44a. . The portions through which the springs 80a; 80b, 80c; 80d of the bent portions 24a, 24b penetrate are expanded in a tapered shape toward the holder 41, and the inside is filled with silicon gel 81 as a damping material. Has been.

  In addition, on both side portions orthogonal to the optical axis of the coils 51a and / or 51b (see FIG. 3), the holder 41 faces the permanent magnets 52a and / or 52b (see FIG. 3) and the holder 41 is orthogonal to the optical axis. The coils 82a and 82b for driving are attached, and yokes 83a and 83b are bonded and fixed in the cores of the coils 82a and 82b. Similarly, the holder 41 is also driven in a direction orthogonal to the optical axis to both side portions orthogonal to the optical axis of the coil 55 (see FIG. 3) disposed on the opposite side of the coils 51a and 51b via the holder 41. Coils 82c and 82d (not shown) are mounted, and yokes are bonded and fixed in the cores of these coils. Other configurations are the same as those of the first embodiment.

  In the present embodiment, as the excitation operation of the holder 51, the coils 51a and 51b and the coil 55 are used, and the same rotational excitation as that of the first embodiment in which the generation direction of the driving force is the opposite direction. In addition, using the coils 82a to 82d, parallel excitation in a direction orthogonal to the optical axis, in which the generation direction of the driving force is the same direction, and using the coils 82a to 82d, the coils 82a and 82b and the coils 82c, A rotational excitation is performed about the optical axis with the direction of generation of the driving force with 82d as the opposite direction.

  Thus, in the present embodiment, the holder 41 that holds the light guide 13 is supported by the holder support member 24 via the four springs 80a to 80d so as to be displaceable, and the holder 41 is orthogonal to the optical axis. Since the coils 82a to 82d that are vibrated in the direction to be added are added, the holder 41 can be vibrated in various vibration modes. Therefore, since the holder 41 can be vibrated in a vibrating manner according to the usage environment of the projector 1, dust can be efficiently removed, and the reliability of the apparatus can be further improved. Further, since the holder 41 can be displaced in a direction orthogonal to the optical axis, the position of the illumination light beam can be controlled with respect to the modulation region of the spatial light modulation element 3 at the subsequent stage, thereby modulating the spatial light modulation element 3. The illumination light beam can be reliably incident on the entire area, and an image can be projected and displayed with good quality.

  The present invention is not limited to the above-described embodiment, and many variations or modifications are possible. For example, in the above embodiment, the video display mode and the dust removal mode are made independent, but the dust removal operation can be automatically executed when the video display mode ends. Moreover, it can replace with the vibration operation detection by the Hall element 54, and can also comprise so that the displacement by the vibration of the holder 41 may be detected using a photo reflector.

  Further, the driving means of the holder 41 is not limited to a moving magnet type electromagnetic driving means, but may be a moving coil type electromagnetic driving means.

  Furthermore, in the second embodiment, the coil for driving the holder 41 in the direction orthogonal to the optical axis is provided on the coil for driving in the optical axis direction. For example, as shown in FIG. A magnetic body (yoke) coupled to a printed circuit board (not shown) in the core of each coil so that the direction driving coil 85 and the optical axis orthogonal direction driving coil 86 are arranged in the same plane. 87 and 88 can be entered and fixed by adhesion.

  Moreover, in the said embodiment, although the LED array 11 which has each LED group of RGB was used as a light source, the semiconductor laser for RGB is used, or the LED array and discharge lamp which light-emit white light are used. You can also. Further, the projector is not limited to a single plate type but can be a multi-plate type.

  Furthermore, the hologram element 14 can be provided not only on the exit surface of the light guide 13 but also on the entrance surface. In this case, in the arrangement of the LED group shown in FIG. 1 with the incident surface of the light guide 13 as a flat surface orthogonal to the optical axis, for example, + 1st order diffracted light for G light and 0th order for B light For light R, −1st order diffracted light is guided in parallel with the optical axis of the light guide 13, and ± 1st order diffracted light of B light is received by the photodetectors 17 and 18. Can do. Therefore, in this case, the ± first-order diffracted light of the B light has a concave lens action so that the focal distance of the diffracted light is longer than the exit surface of the light guide 13. Moreover, the hologram element 14 can also be divided into two in the optical axis direction and the light guide 13 can be arranged in the divided portion. In this case, the ± first-order diffracted light of each RGB light can be received by the photodetectors 17 and 18, so that the diffracted light has a concave lens action to guide the focal length of the diffracted light. It is longer than the exit surface of the body 13.

  Furthermore, one of the photodetectors 17 and 18 can be omitted, and the positional deviation of the light guide 13 can be detected using a photodetector having one four-divided light receiving region, or can be divided into four. Instead of the photodetector having the light receiving region, a position shift in the optical axis direction of the light guide 13 can be detected using a semiconductor position detection element (PSD).

It is a figure which shows diagrammatically the schematic structure of the optical system of the projector using the illuminating device which concerns on 1st Embodiment of this invention. FIG. 2 is a plan view of two photodetectors shown in FIG. 1. It is sectional drawing which shows the structure of the principal part of the illuminating device shown in FIG. It is the partial front view which looked at the holder support member shown in FIG. 3 from the output side of the light guide. It is a fragmentary perspective view of the elastic support member and auxiliary cylinder which are shown in FIG. It is a block diagram which shows schematic structure of the principal part of the control circuit in the projector shown in FIG. 3 is a flowchart showing an operation of a main part of a video display mode in the projector shown in FIG. Similarly, it is a flowchart which shows operation | movement of the principal part of dust removal mode. It is a figure which shows the structure of the principal part of the illuminating device which concerns on 2nd Embodiment of this invention. It is a figure for demonstrating the modification of 2nd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Projector 2 Illuminating device 3 Spatial light modulation element 4 Projection lens 5 Screen 7 Fan 11 LED array 12 Lens array 12a Single lens 12b Array substrate 13 Light guide 14 Hologram element 15 First lens 16 Second lens 17, 18 Photo detector DESCRIPTION OF SYMBOLS 21 Base member 22 Lens array holding member 23 Light source holding plate 23a Radiation fin 24 Holder support member 24a, 24b, 24c Bending part 25 Thermal insulation material 26 Temperature sensor 31 Light source support member 32 Light source printed board 35 Light source inclination adjustment mechanism 41 Holder 42a , 42b Leaf springs 44a, 44b Coil printed circuit board 45 Damper material 51a, 51b, 55 Coils 52a, 52b, 56 Permanent magnet 53 Flexible wiring board 54 Hall element 57 Tilt adjustment mechanism for holder 101 MO Selection switch 102 CPU
DESCRIPTION OF SYMBOLS 103 Oscillation circuit 104 Dust removal resonance drive circuit 105 Discrimination circuit 106 Servo circuit 110 Fan drive circuit 111 Light source drive circuit 112 Display circuit 113 Storage part

Claims (11)

In the illumination device that emits the illumination light beam from the light source through the light guide,
A holder for holding the light guide;
An elastic support member that supports the holder so as to be displaceable at least in the optical axis direction with respect to the holder support member;
Holder driving means for driving the holder;
Position detecting means for detecting the position of the holder in the optical axis direction;
Servo control means for controlling the position of the holder in the optical axis direction by the holder driving means based on the output of the position detecting means;
Vibration control means for selectively vibrating the holder by the holder driving means under a non-operating state of the servo control means ,
The holder driving means comprises an electromagnetic driving means having a permanent magnet and a coil, the permanent magnet on the holder side, and the coil on the holder support member side,
The lighting device according to claim 1, wherein the holder support member is made of a magnetic material, and the coil is coupled to the holder support member via a coil printed board in a state where the holder support member is inserted into the coil .   The position detecting means includes a hologram element provided on a surface orthogonal to the optical axis of the light guide, and a photodetector arranged to receive predetermined diffracted light of the hologram element. The lighting device according to claim 1.   The illumination device according to claim 2, wherein the hologram element is provided on an incident surface or an emission surface of the light guide.   The lighting device according to any one of claims 1 to 3, wherein the holder support member is held on the base member via a holder tilt adjustment mechanism so that the tilt in the optical axis direction can be adjusted.   The light source is attached to a light source printed board via a metal light source support member, and the light source printed board is coupled to the base member via a light source tilt adjusting mechanism so that the tilt in the optical axis direction can be adjusted. The lighting device according to claim 4.   6. The light source according to claim 1, wherein the light source comprises a point light source array having a plurality of point light sources, and a lens array having a plurality of single lenses is disposed between the point light source array and the light guide. The illumination device according to any one of the above.   The lighting device according to claim 6, wherein the lens array is formed by integrally molding the plurality of single lenses with an optical material having a refractive index higher than that of the array substrate.   The vibration control means has an oscillation circuit, and is configured to drive the holder driving means based on the output of the oscillation circuit to vibrate the holder at a resonance frequency of a movable part including the holder. The lighting device according to claim 1, wherein the lighting device is a light emitting device. The permanent magnet is divided into two in the optical axis direction, and the magnetic pole surface in the thickness direction is arranged with the opposite polarity,
On the side where the coil is arranged, a Hall element is provided so as to face the dividing boundary line of the permanent magnet,
The lighting device according to any one of claims 1 to 8, wherein the holder driving unit detects a vibration operation of the holder based on an output of the Hall element. Provide a photo reflector on the holder support member side or the holder side,
Provided on the holder side or the holder support member side is a reflecting member that is inclined in the optical axis direction and reflects light from the photoreflector,
The illumination device according to any one of claims 1 to 8 , characterized in that an excitation operation of the holder by the holder driving means is detected based on an output of the photo reflector. The lighting device according to any one of claims 1 to 10 ,
A spatial light modulation element that spatially modulates an illumination light beam from the illumination device according to an image;
A projection type image display apparatus comprising: a projection lens that projects and displays an illumination light beam spatially modulated by the spatial light modulation element.

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